cmd/mbf: bring back pkgserver's favicon!

It existed in mae's #33, but ozy was not satisfied with including
a binary file identical to https://hakurei.app's favicon, and hence
removed it. However, it's possible to explicitly specify the favicon
with a link tag [1]; provided a content security policy that isn't too
strong, this should work fine.

[1]: https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/rel#icon

.gitignore

@@ -8,7 +8,7 @@
 # go generate
 /cmd/hakurei/LICENSE
 /cmd/mbf/internal/pkgserver/ui/static
-/internal/pkg/testdata/testtool
+/internal/pkg/internal/testtool/testtool
 /internal/rosa/hakurei_current.tar.gz
 
 # cmd/dist default destination

all.sh

@@ -1,10 +1,3 @@
 #!/bin/sh -e
 
-TOOLCHAIN_VERSION="$(go version)"
+HAKUREI_DIST_MAKE='' exec "$(dirname -- "$0")/cmd/dist/dist.sh"
-cd "$(dirname -- "$0")/"
-echo "Building cmd/dist using ${TOOLCHAIN_VERSION}."
-FLAGS=''
-if test -n "$VERBOSE"; then
-    FLAGS="$FLAGS -v"
-fi
-go run $FLAGS --tags=dist ./cmd/dist

cmd/dist/dist.sh

@@ -0,0 +1,10 @@
+#!/bin/sh -e
+
+TOOLCHAIN_VERSION="$(go version)"
+cd "$(dirname -- "$0")/../.."
+echo "Building cmd/dist using ${TOOLCHAIN_VERSION}."
+FLAGS=''
+if test -n "$VERBOSE"; then
+    FLAGS="$FLAGS -v"
+fi
+go run $FLAGS --tags=dist ./cmd/dist

cmd/dist/main.go

@@ -46,6 +46,7 @@ func main() {
 	log.SetPrefix("")
 
 	verbose := os.Getenv("VERBOSE") != ""
+	runTests := os.Getenv("HAKUREI_DIST_MAKE") == ""
 	version := getenv("HAKUREI_VERSION", "untagged")
 	prefix := getenv("PREFIX", "/usr")
 	destdir := getenv("DESTDIR", "dist")
@@ -101,13 +102,15 @@ func main() {
 	)
 	log.Println()
 
-	log.Println("##### Testing Hakurei.")
+	if runTests {
-	mustRun(
+		log.Println("##### Testing Hakurei.")
-		ctx, "go", "test",
+		mustRun(
-		"-ldflags=-buildid= -linkmode external -extldflags=-static",
+			ctx, "go", "test",
-		"./...",
+			"-ldflags=-buildid= -linkmode external -extldflags=-static",
-	)
+			"./...",
-	log.Println()
+		)
+		log.Println()
+	}
 
 	log.Println("##### Creating distribution.")
 	const suffix = ".tar.gz"

cmd/mbf/cache.go

@@ -7,6 +7,7 @@ import (
 	"testing"
 
 	"hakurei.app/check"
+	"hakurei.app/container"
 	"hakurei.app/internal/pkg"
 	"hakurei.app/message"
 )
@@ -19,8 +20,15 @@ type cache struct {
 	// Should generally not be used directly.
 	c *pkg.Cache
 
-	cures, jobs        int
+	cures, jobs int
-	hostAbstract, idle bool
+	// Primarily to work around missing landlock LSM.
+	hostAbstract bool
+	// Set SCHED_IDLE.
+	idle bool
+	// Unset [pkg.CSuppressInit].
+	verboseInit bool
+	// Loaded artifact of [rosa.QEMU].
+	qemu pkg.Artifact
 
 	base string
 }
@@ -45,6 +53,9 @@ func (cache *cache) open() (err error) {
 	if cache.hostAbstract {
 		flags |= pkg.CHostAbstract
 	}
+	if !cache.verboseInit {
+		flags |= pkg.CSuppressInit
+	}
 
 	done := make(chan struct{})
 	defer close(done)
@@ -70,6 +81,39 @@ func (cache *cache) open() (err error) {
 		cache.jobs,
 		base,
 	)
+	if err != nil {
+		return
+	}
+	done <- struct{}{}
+
+	if cache.qemu != nil {
+		var pathname *check.Absolute
+		pathname, _, err = cache.c.Cure(cache.qemu)
+		if err != nil {
+			cache.c.Close()
+			return
+		}
+
+		pkg.RegisterArch("riscv64", container.BinfmtEntry{
+			Offset: 0,
+			Magic:  "\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00",
+			Mask:   "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff",
+			Interpreter: pathname.Append(
+				"system/bin",
+				"qemu-riscv64",
+			),
+		})
+		pkg.RegisterArch("arm64", container.BinfmtEntry{
+			Offset: 0,
+			Magic:  "\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00",
+			Mask:   "\xff\xff\xff\xff\xff\xff\xff\xfc\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff",
+			Interpreter: pathname.Append(
+				"system/bin",
+				"qemu-aarch64",
+			),
+		})
+	}
+
 	return
 }
 

cmd/mbf/info.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"os"
 	"strings"
+	"unique"
 
 	"hakurei.app/internal/pkg"
 	"hakurei.app/internal/rosa"
@@ -35,17 +36,20 @@ func commandInfo(
 		}
 	}
 
+	t := rosa.Native().Std()
 	for i, name := range args {
-		if p, ok := rosa.ResolveName(name); !ok {
+		handle := rosa.ArtifactH(unique.Make(name))
+		if meta := rosa.Native().Get(handle); meta == nil {
 			return fmt.Errorf("unknown artifact %q", name)
 		} else {
 			var suffix string
-			if version := rosa.Std.Version(p); version != rosa.Unversioned {
+
+			a, version := t.MustLoad(handle)
+			if version != rosa.Unversioned {
 				suffix += "-" + version
 			}
 			mustPrintln("name        : " + name + suffix)
 
-			meta := rosa.GetMetadata(p)
 			mustPrintln("description : " + meta.Description)
 			if meta.Website != "" {
 				mustPrintln("website     : " +
@@ -54,9 +58,9 @@ func commandInfo(
 			if len(meta.Dependencies) > 0 {
 				mustPrint("depends on  :")
 				for _, d := range meta.Dependencies {
-					s := rosa.GetMetadata(d).Name
+					s := rosa.Native().MustGet(d).Name
-					if version := rosa.Std.Version(d); version != rosa.Unversioned {
+					if _, _version := t.Load(d); _version != rosa.Unversioned {
-						s += "-" + version
+						s += "-" + _version
 					}
 					mustPrint(" " + s)
 				}
@@ -68,7 +72,7 @@ func commandInfo(
 				if r == nil {
 					var f io.ReadSeekCloser
 					err = cm.Do(func(cache *pkg.Cache) (err error) {
-						f, err = cache.OpenStatus(rosa.Std.Load(p))
+						f, err = cache.OpenStatus(a)
 						return
 					})
 					if err != nil {
@@ -87,7 +91,7 @@ func commandInfo(
 						}
 					}
 				} else if err = cm.Do(func(cache *pkg.Cache) (err error) {
-					status, n := r.ArtifactOf(cache.Ident(rosa.Std.Load(p)))
+					status, n := r.ArtifactOf(cache.Ident(a))
 					if status == nil {
 						mustPrintln(
 							statusPrefix + "not in report",

cmd/mbf/info_test.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 	"syscall"
 	"testing"
+	"unique"
 	"unsafe"
 
 	"hakurei.app/internal/pkg"
@@ -20,6 +21,14 @@ import (
 func TestInfo(t *testing.T) {
 	t.Parallel()
 
+	_t := rosa.Native().Std()
+	_, qemuVersion := _t.Load(rosa.QEMU)
+	_, glibVersion := _t.Load(rosa.GLib)
+	zlib, zlibVersion := _t.Load(rosa.Zlib)
+	_, zstdVersion := _t.Load(rosa.Zstd)
+	_, hakureiVersion := _t.Load(rosa.Hakurei)
+	_, hakureiDistVersion := _t.Load(rosa.HakureiDist)
+
 	testCases := []struct {
 		name    string
 		args    []string
@@ -29,24 +38,24 @@ func TestInfo(t *testing.T) {
 		wantErr any
 	}{
 		{"qemu", []string{"qemu"}, nil, "", `
-name        : qemu-` + rosa.Std.Version(rosa.QEMU) + `
+name        : qemu-` + qemuVersion + `
 description : a generic and open source machine emulator and virtualizer
 website     : https://www.qemu.org
-depends on  : glib-` + rosa.Std.Version(rosa.GLib) + ` zstd-` + rosa.Std.Version(rosa.Zstd) + `
+depends on  : glib-` + glibVersion + ` zstd-` + zstdVersion + `
 `, nil},
 
 		{"multi", []string{"hakurei", "hakurei-dist"}, nil, "", `
-name        : hakurei-` + rosa.Std.Version(rosa.Hakurei) + `
+name        : hakurei-` + hakureiVersion + `
 description : low-level userspace tooling for Rosa OS
 website     : https://hakurei.app
 
-name        : hakurei-dist-` + rosa.Std.Version(rosa.HakureiDist) + `
+name        : hakurei-dist-` + hakureiDistVersion + `
 description : low-level userspace tooling for Rosa OS (distribution tarball)
 website     : https://hakurei.app
 `, nil},
 
 		{"nonexistent", []string{"zlib", "\x00"}, nil, "", `
-name        : zlib-` + rosa.Std.Version(rosa.Zlib) + `
+name        : zlib-` + zlibVersion + `
 description : lossless data-compression library
 website     : https://zlib.net
 
@@ -56,12 +65,12 @@ website     : https://zlib.net
 			"zstd":    "internal/pkg (amd64) on satori\n",
 			"hakurei": "internal/pkg (amd64) on satori\n\n",
 		}, "", `
-name        : zlib-` + rosa.Std.Version(rosa.Zlib) + `
+name        : zlib-` + zlibVersion + `
 description : lossless data-compression library
 website     : https://zlib.net
 status      : not yet cured
 
-name        : zstd-` + rosa.Std.Version(rosa.Zstd) + `
+name        : zstd-` + zstdVersion + `
 description : a fast compression algorithm
 website     : https://facebook.github.io/zstd
 status      : internal/pkg (amd64) on satori
@@ -70,19 +79,19 @@ status      : internal/pkg (amd64) on satori
 		{"status cache perm", []string{"zlib"}, map[string]string{
 			"zlib": "\x00",
 		}, "", `
-name        : zlib-` + rosa.Std.Version(rosa.Zlib) + `
+name        : zlib-` + zlibVersion + `
 description : lossless data-compression library
 website     : https://zlib.net
 `, func(cm *cache) error {
 			return &os.PathError{
 				Op:   "open",
-				Path: filepath.Join(cm.base, "status", pkg.Encode(cm.c.Ident(rosa.Std.Load(rosa.Zlib)).Value())),
+				Path: filepath.Join(cm.base, "status", pkg.Encode(cm.c.Ident(zlib).Value())),
 				Err:  syscall.EACCES,
 			}
 		}},
 
 		{"status report", []string{"zlib"}, nil, strings.Repeat("\x00", len(pkg.Checksum{})+8), `
-name        : zlib-` + rosa.Std.Version(rosa.Zlib) + `
+name        : zlib-` + zlibVersion + `
 description : lossless data-compression library
 website     : https://zlib.net
 status      : not in report
@@ -131,8 +140,8 @@ status      : not in report
 
 			if tc.status != nil {
 				for name, status := range tc.status {
-					p, ok := rosa.ResolveName(name)
+					a, _ := _t.Load(rosa.ArtifactH(unique.Make(name)))
-					if !ok {
+					if a == nil {
 						t.Fatalf("invalid name %q", name)
 					}
 					perm := os.FileMode(0400)
@@ -143,7 +152,7 @@ status      : not in report
 						return os.WriteFile(filepath.Join(
 							cm.base,
 							"status",
-							pkg.Encode(cache.Ident(rosa.Std.Load(p)).Value()),
+							pkg.Encode(cache.Ident(a).Value()),
 						), unsafe.Slice(unsafe.StringData(status), len(status)), perm)
 					}); err != nil {
 						t.Fatalf("Do: error = %v", err)

cmd/mbf/internal/pkgserver/api.go

@@ -30,7 +30,7 @@ var (
 // handleInfo writes constant system information.
 func handleInfo(w http.ResponseWriter, _ *http.Request) {
 	infoPayloadOnce.Do(func() {
-		infoPayload.Count = int(rosa.PresetUnexportedStart)
+		infoPayload.Count = int(rosa.Native().Count())
 		infoPayload.HakureiVersion = info.Version()
 	})
 	// TODO(mae): cache entire response if no additional fields are planned
@@ -91,7 +91,7 @@ func (index *packageIndex) handleGet(w http.ResponseWriter, r *http.Request) {
 	if err != nil || i >= len(index.sorts[0]) || i < 0 {
 		http.Error(
 			w, "index must be an integer between 0 and "+
-				strconv.Itoa(int(rosa.PresetUnexportedStart-1)),
+				strconv.Itoa(len(index.sorts[0])-1),
 			http.StatusBadRequest,
 		)
 		return
@@ -125,7 +125,7 @@ func (index *packageIndex) handleSearch(w http.ResponseWriter, r *http.Request)
 	if err != nil || i >= len(index.sorts[0]) || i < 0 {
 		http.Error(
 			w, "index must be an integer between 0 and "+
-				strconv.Itoa(int(rosa.PresetUnexportedStart-1)),
+				strconv.Itoa(len(index.sorts[0])-1),
 			http.StatusBadRequest,
 		)
 		return

cmd/mbf/internal/pkgserver/api_test.go

@@ -3,7 +3,6 @@ package pkgserver
 import (
 	"net/http"
 	"net/http/httptest"
-	"slices"
 	"strconv"
 	"testing"
 
@@ -32,7 +31,7 @@ func TestAPIInfo(t *testing.T) {
 	checkPayload(t, resp, struct {
 		Count          int    `json:"count"`
 		HakureiVersion string `json:"hakurei_version"`
-	}{int(rosa.PresetUnexportedStart), info.Version()})
+	}{rosa.Native().Count(), info.Version()})
 }
 
 func TestAPIGet(t *testing.T) {
@@ -96,8 +95,8 @@ func TestAPIGet(t *testing.T) {
 	t.Run("index", func(t *testing.T) {
 		t.Parallel()
 		checkValidate(
-			t, "limit=1&sort=0&index", 0, int(rosa.PresetUnexportedStart-1),
+			t, "limit=1&sort=0&index", 0, rosa.Native().Count()-1,
-			"index must be an integer between 0 and "+strconv.Itoa(int(rosa.PresetUnexportedStart-1)),
+			"index must be an integer between 0 and "+strconv.Itoa(rosa.Native().Count()-1),
 		)
 	})
 
@@ -108,74 +107,4 @@ func TestAPIGet(t *testing.T) {
 			"sort must be an integer between 0 and "+strconv.Itoa(int(sortOrderEnd)),
 		)
 	})
-
-	checkWithSuffix := func(name, suffix string, want []*metadata) {
-		t.Run(name, func(t *testing.T) {
-			t.Parallel()
-
-			w := newRequest(suffix)
-			resp := w.Result()
-			checkStatus(t, resp, http.StatusOK)
-			checkAPIHeader(t, w.Header())
-			checkPayloadFunc(t, resp, func(got *struct {
-				Values []*metadata `json:"values"`
-			}) bool {
-				return slices.EqualFunc(got.Values, want, func(a, b *metadata) bool {
-					return (a.Version == b.Version ||
-						a.Version == rosa.Unversioned ||
-						b.Version == rosa.Unversioned) &&
-						a.HasReport == b.HasReport &&
-						a.Name == b.Name &&
-						a.Description == b.Description &&
-						a.Website == b.Website
-				})
-			})
-
-		})
-	}
-
-	checkWithSuffix("declarationAscending", "?limit=2&index=1&sort=0", []*metadata{
-		{
-			Metadata: rosa.GetMetadata(1),
-			Version:  rosa.Std.Version(1),
-		},
-		{
-			Metadata: rosa.GetMetadata(2),
-			Version:  rosa.Std.Version(2),
-		},
-	})
-	checkWithSuffix("declarationAscending offset", "?limit=3&index=5&sort=0", []*metadata{
-		{
-			Metadata: rosa.GetMetadata(5),
-			Version:  rosa.Std.Version(5),
-		},
-		{
-			Metadata: rosa.GetMetadata(6),
-			Version:  rosa.Std.Version(6),
-		},
-		{
-			Metadata: rosa.GetMetadata(7),
-			Version:  rosa.Std.Version(7),
-		},
-	})
-	checkWithSuffix("declarationDescending", "?limit=3&index=0&sort=1", []*metadata{
-		{
-			Metadata: rosa.GetMetadata(rosa.PresetUnexportedStart - 1),
-			Version:  rosa.Std.Version(rosa.PresetUnexportedStart - 1),
-		},
-		{
-			Metadata: rosa.GetMetadata(rosa.PresetUnexportedStart - 2),
-			Version:  rosa.Std.Version(rosa.PresetUnexportedStart - 2),
-		},
-		{
-			Metadata: rosa.GetMetadata(rosa.PresetUnexportedStart - 3),
-			Version:  rosa.Std.Version(rosa.PresetUnexportedStart - 3),
-		},
-	})
-	checkWithSuffix("declarationDescending offset", "?limit=1&index=37&sort=1", []*metadata{
-		{
-			Metadata: rosa.GetMetadata(rosa.PresetUnexportedStart - 38),
-			Version:  rosa.Std.Version(rosa.PresetUnexportedStart - 38),
-		},
-	})
 }

cmd/mbf/internal/pkgserver/index.go

@@ -23,7 +23,7 @@ const (
 
 // packageIndex refers to metadata by name and various sort orders.
 type packageIndex struct {
-	sorts  [sortOrderEnd + 1][rosa.PresetUnexportedStart]*metadata
+	sorts  [sortOrderEnd + 1][]*metadata
 	names  map[string]*metadata
 	search searchCache
 	// Taken from [rosa.Report] if available.
@@ -32,8 +32,8 @@ type packageIndex struct {
 
 // metadata holds [rosa.Metadata] extended with additional information.
 type metadata struct {
-	p rosa.PArtifact
+	handle rosa.ArtifactH
-	*rosa.Metadata
+	*rosa.Artifact
 
 	// Populated via [rosa.Toolchain.Version], [rosa.Unversioned] is equivalent
 	// to the zero value. Otherwise, the zero value is invalid.
@@ -56,15 +56,17 @@ func (index *packageIndex) populate(report *rosa.Report) (err error) {
 		index.handleAccess = report.HandleAccess
 	}
 
-	var work [rosa.PresetUnexportedStart]*metadata
+	handles := rosa.Native().Collect()
+	work := make([]*metadata, len(handles))
 	index.names = make(map[string]*metadata)
 	ir := pkg.NewIR()
-	for p := range rosa.PresetUnexportedStart {
+	for i, handle := range handles {
+		a, version := rosa.Native().Std().MustLoad(handle)
 		m := metadata{
-			p: p,
+			handle: handle,
 
-			Metadata: rosa.GetMetadata(p),
+			Artifact: rosa.Native().MustGet(handle),
-			Version:  rosa.Std.Version(p),
+			Version:  version,
 		}
 		if m.Version == "" {
 			return errors.New("invalid version from " + m.Name)
@@ -74,32 +76,32 @@ func (index *packageIndex) populate(report *rosa.Report) (err error) {
 		}
 
 		if report != nil {
-			id := ir.Ident(rosa.Std.Load(p))
+			id := ir.Ident(a)
 			m.ids = pkg.Encode(id.Value())
 			m.status, m.Size = report.ArtifactOf(id)
 			m.HasReport = m.Size >= 0
 		}
 
-		work[p] = &m
+		work[i] = &m
 		index.names[m.Name] = &m
 	}
 
 	index.sorts[declarationAscending] = work
-	index.sorts[declarationDescending] = work
+	index.sorts[declarationDescending] = slices.Clone(work)
 	slices.Reverse(index.sorts[declarationDescending][:])
 
-	index.sorts[nameAscending] = work
+	index.sorts[nameAscending] = slices.Clone(work)
 	slices.SortFunc(index.sorts[nameAscending][:], func(a, b *metadata) int {
 		return strings.Compare(a.Name, b.Name)
 	})
-	index.sorts[nameDescending] = index.sorts[nameAscending]
+	index.sorts[nameDescending] = slices.Clone(index.sorts[nameAscending])
 	slices.Reverse(index.sorts[nameDescending][:])
 
-	index.sorts[sizeAscending] = work
+	index.sorts[sizeAscending] = slices.Clone(work)
 	slices.SortFunc(index.sorts[sizeAscending][:], func(a, b *metadata) int {
 		return cmp.Compare(a.Size, b.Size)
 	})
-	index.sorts[sizeDescending] = index.sorts[sizeAscending]
+	index.sorts[sizeDescending] = slices.Clone(index.sorts[sizeAscending])
 	slices.Reverse(index.sorts[sizeDescending][:])
 
 	return

cmd/mbf/internal/pkgserver/ui/index.html

@@ -4,6 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link rel="stylesheet" href="style.css">
+    <link rel="icon" href="https://hakurei.app/favicon.ico"/>
     <title>Hakurei PkgServer</title>
     <script src="index.js"></script>
 </head>

cmd/mbf/main.go

@@ -67,9 +67,13 @@ func main() {
 
 	var (
 		flagQuiet bool
+		flagQEMU  bool
+		flagArch  string
 		flagCheck bool
 		flagLTO   bool
 
+		flagCrossOverride int
+
 		addr net.UnixAddr
 	)
 	c := command.New(os.Stderr, log.Printf, "mbf", func([]string) error {
@@ -93,13 +97,36 @@ func main() {
 		if !flagLTO {
 			flags |= rosa.OptLLVMNoLTO
 		}
-		rosa.DropCaches(flags)
+		rosa.Native().DropCaches("", flags)
+		cross := flagArch != "" && flagArch != runtime.GOARCH
+		if flagQEMU || cross {
+			cm.qemu, _ = rosa.Native().Std().Load(rosa.QEMU)
+		}
+
+		if cross {
+			if flagCrossOverride != -1 {
+				flags = flagCrossOverride
+			}
+
+			rosa.Native().DropCaches(flagArch, flags)
+			if !rosa.HasStage0() {
+				return pkg.UnsupportedArchError(flagArch)
+			}
+		}
 
 		return nil
 	}).Flag(
 		&flagQuiet,
 		"q", command.BoolFlag(false),
 		"Do not print cure messages",
+	).Flag(
+		&flagQEMU,
+		"register", command.BoolFlag(false),
+		"Enable additional target architectures",
+	).Flag(
+		&flagArch,
+		"arch", command.StringFlag(runtime.GOARCH),
+		"Target architecture",
 	).Flag(
 		&flagLTO,
 		"lto", command.BoolFlag(false),
@@ -108,6 +135,14 @@ func main() {
 		&flagCheck,
 		"check", command.BoolFlag(true),
 		"Run test suites",
+	).Flag(
+		&flagCrossOverride,
+		"cross-flags", command.IntFlag(-1),
+		"Override non-native target preset flags",
+	).Flag(
+		&cm.verboseInit,
+		"v", command.BoolFlag(false),
+		"Do not suppress verbose output from init",
 	).Flag(
 		&cm.cures,
 		"cures", command.IntFlag(0),
@@ -296,12 +331,12 @@ func main() {
 				n atomic.Uint64
 			)
 
-			w := make(chan rosa.PArtifact)
+			w := make(chan rosa.ArtifactH)
 			var wg sync.WaitGroup
 			for range max(flagJobs, 1) {
 				wg.Go(func() {
 					for p := range w {
-						meta := rosa.GetMetadata(p)
+						meta := rosa.Native().MustGet(p)
 						if meta.ID == 0 {
 							continue
 						}
@@ -314,8 +349,9 @@ func main() {
 							continue
 						}
 
+						_, version := rosa.Native().Std().Load(p)
 						if current, latest :=
-							rosa.Std.Version(p),
+							version,
 							meta.GetLatest(v); current != latest {
 
 							n.Add(1)
@@ -329,9 +365,9 @@ func main() {
 			}
 
 		done:
-			for i := range rosa.PresetEnd {
+			for _, p := range rosa.Native().Collect() {
 				select {
-				case w <- rosa.PArtifact(i):
+				case w <- p:
 					break
 				case <-ctx.Done():
 					break done
@@ -376,9 +412,9 @@ func main() {
 			"stage3",
 			"Check for toolchain 3-stage non-determinism",
 			func(args []string) (err error) {
-				t := rosa.Std
+				s := rosa.Std
 				if flagGentoo != "" {
-					t -= 3 // magic number to discourage misuse
+					s -= 3 // magic number to discourage misuse
 
 					var checksum pkg.Checksum
 					if len(flagChecksum) != 0 {
@@ -386,7 +422,7 @@ func main() {
 							return
 						}
 					}
-					rosa.SetGentooStage3(flagGentoo, checksum)
+					rosa.Native().SetGentooStage3(flagGentoo, checksum)
 				}
 
 				var (
@@ -395,9 +431,8 @@ func main() {
 				)
 
 				if err = cm.Do(func(cache *pkg.Cache) (err error) {
-					pathname, _, err = cache.Cure(
+					llvm, _ := rosa.Native().New(s - 2).Load(rosa.LLVM)
-						(t - 2).Load(rosa.LLVM),
+					pathname, _, err = cache.Cure(llvm)
-					)
 					return
 				}); err != nil {
 					return
@@ -405,18 +440,16 @@ func main() {
 				log.Println("stage1:", pathname)
 
 				if err = cm.Do(func(cache *pkg.Cache) (err error) {
-					pathname, checksum[0], err = cache.Cure(
+					llvm, _ := rosa.Native().New(s - 1).Load(rosa.LLVM)
-						(t - 1).Load(rosa.LLVM),
+					pathname, checksum[0], err = cache.Cure(llvm)
-					)
 					return
 				}); err != nil {
 					return
 				}
 				log.Println("stage2:", pathname)
 				if err = cm.Do(func(cache *pkg.Cache) (err error) {
-					pathname, checksum[1], err = cache.Cure(
+					llvm, _ := rosa.Native().New(s).Load(rosa.LLVM)
-						t.Load(rosa.LLVM),
+					pathname, checksum[1], err = cache.Cure(llvm)
-					)
 					return
 				}); err != nil {
 					return
@@ -437,9 +470,8 @@ func main() {
 
 				if flagStage0 {
 					if err = cm.Do(func(cache *pkg.Cache) (err error) {
-						pathname, _, err = cache.Cure(
+						stage0, _ := rosa.Native().New(s).Load(rosa.Stage0)
-							t.Load(rosa.Stage0),
+						pathname, _, err = cache.Cure(stage0)
-						)
 						return
 					}); err != nil {
 						return
@@ -471,6 +503,8 @@ func main() {
 			flagExport  string
 			flagRemote  bool
 			flagNoReply bool
+			flagFaults  bool
+			flagPop     bool
 
 			flagBoot bool
 			flagStd  bool
@@ -482,10 +516,6 @@ func main() {
 				if len(args) != 1 {
 					return errors.New("cure requires 1 argument")
 				}
-				p, ok := rosa.ResolveName(args[0])
-				if !ok {
-					return fmt.Errorf("unknown artifact %q", args[0])
-				}
 
 				t := rosa.Std
 				if flagBoot {
@@ -494,11 +524,16 @@ func main() {
 					t -= 1
 				}
 
+				a, _ := rosa.Native().New(t).Load(rosa.ArtifactH(unique.Make(args[0])))
+				if a == nil {
+					return fmt.Errorf("unknown artifact %q", args[0])
+				}
+
 				switch {
 				default:
 					var pathname *check.Absolute
 					err := cm.Do(func(cache *pkg.Cache) (err error) {
-						pathname, _, err = cache.Cure(t.Load(p))
+						pathname, _, err = cache.Cure(a)
 						return
 					})
 					if err != nil {
@@ -540,7 +575,7 @@ func main() {
 						return err
 					}
 
-					if err = pkg.NewIR().EncodeAll(f, rosa.Std.Load(p)); err != nil {
+					if err = pkg.NewIR().EncodeAll(f, a); err != nil {
 						_ = f.Close()
 						return err
 					}
@@ -551,7 +586,7 @@ func main() {
 					return cm.Do(func(cache *pkg.Cache) error {
 						return cache.EnterExec(
 							ctx,
-							t.Load(p),
+							a,
 							true, os.Stdin, os.Stdout, os.Stderr,
 							rosa.AbsSystem.Append("bin", "mksh"),
 							"sh",
@@ -563,7 +598,6 @@ func main() {
 					if flagNoReply {
 						flags |= remoteNoReply
 					}
-					a := t.Load(p)
 					pathname, err := cureRemote(ctx, &addr, a, flags)
 					if !flagNoReply && err == nil {
 						log.Println(pathname)
@@ -579,6 +613,49 @@ func main() {
 					}
 
 					return err
+
+				case flagFaults:
+					var faults []pkg.Fault
+					if err := cm.Do(func(cache *pkg.Cache) (err error) {
+						faults, err = cache.ReadFaults(a)
+						return
+					}); err != nil {
+						return err
+					}
+
+					for _, fault := range faults {
+						log.Printf("%s: %s ago", fault.String(), time.Since(fault.Time()))
+					}
+					return nil
+
+				case flagPop:
+					var faults []pkg.Fault
+					if err := cm.Do(func(cache *pkg.Cache) (err error) {
+						faults, err = cache.ReadFaults(a)
+						return
+					}); err != nil {
+						return err
+					}
+
+					if len(faults) == 0 {
+						return errors.New("no fault entries found")
+					}
+					fault := faults[len(faults)-1]
+					r, err := fault.Open()
+					if err != nil {
+						return err
+					}
+					if _, err = io.Copy(os.Stdout, r); err != nil {
+						_ = r.Close()
+						return err
+					}
+					fmt.Println()
+					if err = r.Close(); err != nil {
+						return err
+					}
+
+					log.Printf("faulting cure terminated %s ago", time.Since(fault.Time()))
+					return fault.Destroy()
 				}
 			},
 		).Flag(
@@ -609,9 +686,40 @@ func main() {
 			&flagStd,
 			"std", command.BoolFlag(false),
 			"Build on the intermediate toolchain",
+		).Flag(
+			&flagFaults,
+			"faults", command.BoolFlag(false),
+			"Display fault entries of the specified artifact",
+		).Flag(
+			&flagPop,
+			"pop", command.BoolFlag(false),
+			"Display and destroy the most recent fault entry",
 		)
 	}
 
+	c.NewCommand(
+		"clear",
+		"Remove all fault entries from the cache",
+		func([]string) error {
+			return cm.Do(func(*pkg.Cache) error {
+				pathname := filepath.Join(cm.base, "fault")
+				dents, err := os.ReadDir(pathname)
+				if err != nil {
+					return err
+				}
+
+				for _, dent := range dents {
+					msg.Verbosef("destroying entry %s", dent.Name())
+					if err = os.Remove(filepath.Join(pathname, dent.Name())); err != nil {
+						return err
+					}
+				}
+				log.Printf("destroyed %d fault entries", len(dents))
+				return nil
+			})
+		},
+	)
+
 	c.NewCommand(
 		"abort",
 		"Abort all pending cures on the daemon",
@@ -629,27 +737,26 @@ func main() {
 			"shell",
 			"Interactive shell in the specified Rosa OS environment",
 			func(args []string) error {
-				presets := make([]rosa.PArtifact, len(args)+3)
+				handles := make([]rosa.ArtifactH, len(args)+3)
 				for i, arg := range args {
-					p, ok := rosa.ResolveName(arg)
+					handles[i] = rosa.ArtifactH(unique.Make(arg))
-					if !ok {
+					if rosa.Native().Get(handles[i]) == nil {
 						return fmt.Errorf("unknown artifact %q", arg)
 					}
-					presets[i] = p
 				}
 
 				base := rosa.LLVM
 				if !flagWithToolchain {
 					base = rosa.Musl
 				}
-				presets = append(presets,
+				handles = append(handles,
 					base,
 					rosa.Mksh,
 					rosa.Toybox,
 				)
 
 				root := make(pkg.Collect, 0, 6+len(args))
-				root = rosa.Std.AppendPresets(root, presets...)
+				root = rosa.Native().Std().Append(root, handles...)
 
 				if err := cm.Do(func(cache *pkg.Cache) error {
 					_, _, err := cache.Cure(&root)
@@ -710,6 +817,7 @@ func main() {
 				z.Hostname = "localhost"
 				z.Uid, z.Gid = (1<<10)-1, (1<<10)-1
 				z.Stdin, z.Stdout, z.Stderr = os.Stdin, os.Stdout, os.Stderr
+				z.Quiet = !cm.verboseInit
 				if s, ok := os.LookupEnv("TERM"); ok {
 					z.Env = append(z.Env, "TERM="+s)
 				}

cmd/mbf/main_test.go

@@ -9,7 +9,7 @@ import (
 )
 
 func TestMain(m *testing.M) {
-	rosa.DropCaches(rosa.OptLLVMNoLTO)
+	rosa.Native().DropCaches("", rosa.OptLLVMNoLTO)
 	os.Exit(m.Run())
 }
 
@@ -35,10 +35,10 @@ func TestCureAll(t *testing.T) {
 		}
 	})
 
-	for i := range rosa.PresetEnd {
+	for _, handle := range rosa.Native().Collect() {
-		p := rosa.PArtifact(i)
+		a, _ := rosa.Native().Std().MustLoad(handle)
-		t.Run(rosa.GetMetadata(p).Name, func(t *testing.T) {
+		t.Run(rosa.Native().MustGet(handle).Name, func(t *testing.T) {
-			_, err := cureRemote(t.Context(), &addr, rosa.Std.Load(p), 0)
+			_, err := cureRemote(t.Context(), &addr, a, 0)
 			if err != nil {
 				t.Error(err)
 			}

cmd/sharefs/test/configuration.nix

@@ -20,11 +20,14 @@
   };
 
   virtualisation = {
+    # Hopefully reduces spurious test failures:
+    memorySize = if pkgs.stdenv.hostPlatform.is32bit then 2046 else 8192;
+
     diskSize = 6 * 1024;
 
     qemu.options = [
       # Increase test performance:
-      "-smp 8"
+      "-smp 16"
     ];
   };
 

cmd/sharefs/test/default.nix

@@ -28,7 +28,7 @@ testers.nixosTest {
         # For go tests:
         (pkgs.writeShellScriptBin "sharefs-workload-hakurei-tests" ''
           cp -r "${self.packages.${system}.hakurei.src}" "/sdcard/hakurei" && cd "/sdcard/hakurei"
-          ${fhs}/bin/hakurei-fhs -c 'CC="clang -O3 -Werror" go test ./...'
+          ${fhs}/bin/hakurei-fhs -c 'ROSA_SKIP_BINFMT=1 CC="clang -O3 -Werror" go test ./...'
         '')
       ];
 

container/binfmt.go

@@ -0,0 +1,46 @@
+package container
+
+import (
+	"strings"
+	"unsafe"
+
+	"hakurei.app/check"
+)
+
+// escapeBinfmt escapes magic/mask sequences in a [BinfmtEntry].
+func escapeBinfmt(buf *strings.Builder, s string) string {
+	const lowerhex = "0123456789abcdef"
+
+	buf.Reset()
+	for _, c := range unsafe.Slice(unsafe.StringData(s), len(s)) {
+		switch c {
+		case 0, '\\', ':':
+			buf.WriteString(`\x`)
+			buf.WriteByte(lowerhex[c>>4])
+			buf.WriteByte(lowerhex[c&0xf])
+
+		default:
+			buf.WriteByte(c)
+		}
+	}
+	return buf.String()
+}
+
+// BinfmtEntry is an entry to be registered by the init process.
+type BinfmtEntry struct {
+	// The offset of the magic/mask in the file, counted in bytes.
+	Offset byte
+	// The byte sequence binfmt_misc is matching for.
+	Magic string
+	// An (optional, defaults to all 0xff) mask.
+	Mask string
+	// The program that should be invoked with the binary as first argument.
+	Interpreter *check.Absolute
+}
+
+// Valid returns whether e can be registered into the kernel.
+func (e *BinfmtEntry) Valid() bool {
+	return e != nil &&
+		int(e.Offset)+max(len(e.Magic), len(e.Mask)) < 128 &&
+		e.Interpreter != nil && len(e.Interpreter.String()) < 128
+}

container/binfmt_test.go

@@ -0,0 +1,62 @@
+package container
+
+import (
+	"strings"
+	"testing"
+
+	"hakurei.app/fhs"
+)
+
+func TestEscapeBinfmt(t *testing.T) {
+	t.Parallel()
+
+	testCases := []struct {
+		name  string
+		magic string
+		want  string
+	}{
+		{"packed DOS applications", "\x0eDEX", "\x0eDEX"},
+
+		{"riscv64 magic",
+			"\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00",
+			"\x7fELF\x02\x01\x01\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\x02\\x00\xf3\\x00"},
+		{"riscv64 mask",
+			"\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff",
+			"\xff\xff\xff\xff\xff\xff\xff\\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff"},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
+			got := escapeBinfmt(new(strings.Builder), tc.magic)
+			if got != tc.want {
+				t.Errorf("escapeBinfmt: %q, want %q", got, tc.want)
+			}
+		})
+	}
+}
+
+func TestBinfmtEntry(t *testing.T) {
+	t.Parallel()
+
+	testCases := []struct {
+		name  string
+		e     BinfmtEntry
+		valid bool
+	}{
+		{"zero", BinfmtEntry{}, false},
+		{"large offset", BinfmtEntry{Offset: 128}, false},
+		{"long magic", BinfmtEntry{Magic: strings.Repeat("\x00", 128)}, false},
+		{"long mask", BinfmtEntry{Mask: strings.Repeat("\x00", 128)}, false},
+		{"valid", BinfmtEntry{Interpreter: fhs.AbsRoot}, true},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
+			if tc.e.Valid() != tc.valid {
+				t.Errorf("Valid: %v", !tc.valid)
+			}
+		})
+	}
+}

container/capability.go

@@ -18,6 +18,7 @@ const (
 	CAP_SETPCAP      = 0x8
 	CAP_NET_ADMIN    = 0xc
 	CAP_DAC_OVERRIDE = 0x1
+	CAP_SETFCAP      = 0x1f
 )
 
 type (

container/container.go

@@ -67,6 +67,9 @@ type (
 		// Copied to the underlying [exec.Cmd].
 		WaitDelay time.Duration
 
+		// Suppress verbose output of init.
+		Quiet bool
+
 		cmd *exec.Cmd
 		ctx context.Context
 		msg message.Msg
@@ -88,12 +91,20 @@ type (
 		// Time to wait for processes lingering after the initial process terminates.
 		AdoptWaitDelay time.Duration
 
+		// Map uid/gid 0 in the init process. Requires [FstypeProc] attached to
+		// [fhs.Proc] in the container filesystem.
+		InitAsRoot bool
 		// Mapped Uid in user namespace.
 		Uid int
 		// Mapped Gid in user namespace.
 		Gid int
 		// Hostname value in UTS namespace.
 		Hostname string
+		// Register binfmt_misc entries.
+		Binfmt []BinfmtEntry
+		// Alternative pathname to attach binfmt_misc filesystem. The zero value
+		// requires [FstypeProc] to be made available at [fhs.Proc].
+		BinfmtPath *check.Absolute
 		// Sequential container setup ops.
 		*Ops
 
@@ -213,6 +224,9 @@ func (p *Container) Start() error {
 	if p.cmd.Process != nil {
 		return errors.New("container: already started")
 	}
+	if !p.InitAsRoot && len(p.Binfmt) > 0 {
+		return errors.New("container: init as root required, but not enabled")
+	}
 
 	if err := ensureCloseOnExec(); err != nil {
 		return err
@@ -283,6 +297,18 @@ func (p *Container) Start() error {
 	if !p.HostNet {
 		p.cmd.SysProcAttr.Cloneflags |= CLONE_NEWNET
 	}
+	if p.InitAsRoot {
+		p.cmd.SysProcAttr.AmbientCaps = append(p.cmd.SysProcAttr.AmbientCaps,
+			// mappings during init as root
+			CAP_SETFCAP,
+		)
+
+		if !p.SeccompDisable &&
+			len(p.SeccompRules) == 0 &&
+			p.SeccompPresets&std.PresetDenyNS != 0 {
+			return errors.New("container: as root requires late namespace creation")
+		}
+	}
 
 	// place setup pipe before user supplied extra files, this is later restored by init
 	if r, w, err := os.Pipe(); err != nil {
@@ -342,8 +368,6 @@ func (p *Container) Start() error {
 						Err:    ENOSYS,
 						Origin: true,
 					}
-				} else {
-					p.msg.Verbosef("landlock abi version %d", abi)
 				}
 
 				if rulesetFd, err := rulesetAttr.Create(0); err != nil {
@@ -353,7 +377,6 @@ func (p *Container) Start() error {
 						Err:   err,
 					}
 				} else {
-					p.msg.Verbosef("enforcing landlock ruleset %s", rulesetAttr)
 					if err = landlock.RestrictSelf(rulesetFd, 0); err != nil {
 						_ = Close(rulesetFd)
 						return &StartError{
@@ -410,7 +433,6 @@ func (p *Container) Start() error {
 				}
 			}
 
-			p.msg.Verbose("starting container init")
 			if err := p.cmd.Start(); err != nil {
 				return &StartError{
 					Step:        "start container init",
@@ -481,7 +503,6 @@ func (p *Container) Serve() (err error) {
 			}
 
 		case <-done:
-			p.msg.Verbose("setup payload took", time.Since(t))
 			return
 		}
 	}(p.setup[1])
@@ -491,7 +512,7 @@ func (p *Container) Serve() (err error) {
 		Getuid(),
 		Getgid(),
 		len(p.ExtraFiles),
-		p.msg.IsVerbose(),
+		p.msg.IsVerbose() && !p.Quiet,
 	})
 }
 

container/container_test.go

@@ -16,7 +16,8 @@ import (
 	"strings"
 	"syscall"
 	"testing"
-	_ "unsafe" // for go:linkname
+	"time"
+	"unsafe"
 
 	"hakurei.app/check"
 	"hakurei.app/command"
@@ -408,39 +409,11 @@ var containerTestCases = []struct {
 func TestContainer(t *testing.T) {
 	t.Parallel()
 
-	t.Run("cancel", testContainerCancel(nil, func(t *testing.T, c *container.Container) {
+	var suffix string
-		wantErr := context.Canceled
+runTests:
-		wantExitCode := 0
-		if err := c.Wait(); !reflect.DeepEqual(err, wantErr) {
-			if m, ok := container.InternalMessageFromError(err); ok {
-				t.Error(m)
-			}
-			t.Errorf("Wait: error = %#v, want %#v", err, wantErr)
-		}
-		if ps := c.ProcessState(); ps == nil {
-			t.Errorf("ProcessState unexpectedly returned nil")
-		} else if code := ps.ExitCode(); code != wantExitCode {
-			t.Errorf("ExitCode: %d, want %d", code, wantExitCode)
-		}
-	}))
-
-	t.Run("forward", testContainerCancel(func(c *container.Container) {
-		c.ForwardCancel = true
-	}, func(t *testing.T, c *container.Container) {
-		var exitError *exec.ExitError
-		if err := c.Wait(); !errors.As(err, &exitError) {
-			if m, ok := container.InternalMessageFromError(err); ok {
-				t.Error(m)
-			}
-			t.Errorf("Wait: error = %v", err)
-		}
-		if code := exitError.ExitCode(); code != blockExitCodeInterrupt {
-			t.Errorf("ExitCode: %d, want %d", code, blockExitCodeInterrupt)
-		}
-	}))
-
 	for i, tc := range containerTestCases {
-		t.Run(tc.name, func(t *testing.T) {
+		_suffix := suffix
+		t.Run(tc.name+_suffix, func(t *testing.T) {
 			t.Parallel()
 
 			wantOps, wantOpsCtx := tc.ops(t)
@@ -464,6 +437,8 @@ func TestContainer(t *testing.T) {
 			c.SeccompDisable = !tc.filter
 			c.RetainSession = tc.session
 			c.HostNet = tc.net
+			c.InitAsRoot = _suffix != ""
+			c.Env = append(c.Env, "HAKUREI_TEST_SUFFIX="+_suffix)
 			if info.CanDegrade {
 				if _, err := landlock.GetABI(); err != nil {
 					if !errors.Is(err, syscall.ENOSYS) {
@@ -473,6 +448,9 @@ func TestContainer(t *testing.T) {
 					t.Log("Landlock LSM is unavailable, enabling HostAbstract")
 				}
 			}
+			if c.InitAsRoot {
+				c.SeccompPresets &= ^std.PresetDenyNS
+			}
 
 			c.
 				Readonly(check.MustAbs(pathReadonly), 0755).
@@ -541,6 +519,11 @@ func TestContainer(t *testing.T) {
 			}
 		})
 	}
+
+	if suffix == "" {
+		suffix = " as root"
+		goto runTests
+	}
 }
 
 func ent(root, target, vfsOptstr, fsType, source, fsOptstr string) *vfs.MountInfoEntry {
@@ -563,49 +546,118 @@ func hostnameFromTestCase(name string) string {
 }
 
 func testContainerCancel(
+	t *testing.T,
 	containerExtra func(c *container.Container),
-	waitCheck func(t *testing.T, c *container.Container),
+	waitCheck func(ps *os.ProcessState, waitErr error),
-) func(t *testing.T) {
+) {
-	return func(t *testing.T) {
+	ctx, cancel := context.WithCancel(t.Context())
-		t.Parallel()
-		ctx, cancel := context.WithCancel(t.Context())
 
-		c := helperNewContainer(ctx, "block")
+	c := helperNewContainer(ctx, "block")
-		c.Stdout, c.Stderr = os.Stdout, os.Stderr
+	c.Stdout, c.Stderr = os.Stdout, os.Stderr
-		if containerExtra != nil {
+	if containerExtra != nil {
-			containerExtra(c)
+		containerExtra(c)
-		}
-
-		ready := make(chan struct{})
-		if r, w, err := os.Pipe(); err != nil {
-			t.Fatalf("cannot pipe: %v", err)
-		} else {
-			c.ExtraFiles = append(c.ExtraFiles, w)
-			go func() {
-				defer close(ready)
-				if _, err = r.Read(make([]byte, 1)); err != nil {
-					panic(err.Error())
-				}
-			}()
-		}
-
-		if err := c.Start(); err != nil {
-			if m, ok := container.InternalMessageFromError(err); ok {
-				t.Fatal(m)
-			} else {
-				t.Fatalf("cannot start container: %v", err)
-			}
-		} else if err = c.Serve(); err != nil {
-			if m, ok := container.InternalMessageFromError(err); ok {
-				t.Error(m)
-			} else {
-				t.Errorf("cannot serve setup params: %v", err)
-			}
-		}
-		<-ready
-		cancel()
-		waitCheck(t, c)
 	}
+
+	ready := make(chan struct{})
+	var waitErr error
+	r, w, err := os.Pipe()
+	if err != nil {
+		t.Fatalf("cannot pipe: %v", err)
+	}
+
+	c.ExtraFiles = append(c.ExtraFiles, w)
+	go func() {
+		defer close(ready)
+		if _, _err := r.Read(make([]byte, 1)); _err != nil {
+			panic(_err)
+		}
+	}()
+
+	if err = c.Start(); err != nil {
+		if m, ok := container.InternalMessageFromError(err); ok {
+			t.Fatal(m)
+		} else {
+			t.Fatalf("cannot start container: %v", err)
+		}
+	}
+
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+		waitErr = c.Wait()
+		_ = r.SetReadDeadline(time.Now())
+	}()
+
+	if err = c.Serve(); err != nil {
+		if m, ok := container.InternalMessageFromError(err); ok {
+			t.Error(m)
+		} else {
+			t.Errorf("cannot serve setup params: %v", err)
+		}
+	}
+	<-ready
+	cancel()
+	<-done
+	waitCheck(c.ProcessState(), waitErr)
+}
+
+func TestForward(t *testing.T) {
+	t.Parallel()
+
+	f := func(ps *os.ProcessState, waitErr error) {
+		var exitError *exec.ExitError
+		if !errors.As(waitErr, &exitError) {
+			if m, ok := container.InternalMessageFromError(waitErr); ok {
+				t.Error(m)
+			}
+			t.Errorf("Wait: error = %v", waitErr)
+		}
+		if code := exitError.ExitCode(); code != blockExitCodeInterrupt {
+			t.Errorf("ExitCode: %d, want %d", code, blockExitCodeInterrupt)
+		}
+	}
+	t.Run("direct", func(t *testing.T) {
+		t.Parallel()
+		testContainerCancel(t, func(c *container.Container) {
+			c.ForwardCancel = true
+		}, f)
+	})
+	t.Run("as root", func(t *testing.T) {
+		testContainerCancel(t, func(c *container.Container) {
+			c.ForwardCancel = true
+			c.InitAsRoot = true
+			c.Proc(fhs.AbsProc)
+		}, f)
+	})
+}
+
+func TestCancel(t *testing.T) {
+	t.Parallel()
+
+	f := func(ps *os.ProcessState, waitErr error) {
+		wantErr := context.Canceled
+		if !reflect.DeepEqual(waitErr, wantErr) {
+			if m, ok := container.InternalMessageFromError(waitErr); ok {
+				t.Error(m)
+			}
+			t.Errorf("Wait: error = %#v, want %#v", waitErr, wantErr)
+		}
+		if ps == nil {
+			t.Errorf("ProcessState unexpectedly returned nil")
+		} else if code := ps.ExitCode(); code != 0 {
+			t.Errorf("ExitCode: %d, want %d", code, 0)
+		}
+	}
+	t.Run("direct", func(t *testing.T) {
+		t.Parallel()
+		testContainerCancel(t, nil, f)
+	})
+	t.Run("as root", func(t *testing.T) {
+		testContainerCancel(t, func(c *container.Container) {
+			c.InitAsRoot = true
+			c.Proc(fhs.AbsProc)
+		}, f)
+	})
 }
 
 func TestContainerString(t *testing.T) {
@@ -641,6 +693,8 @@ func init() {
 		})
 
 		c.Command("container", command.UsageInternal, func(args []string) error {
+			asRoot := os.Getenv("HAKUREI_TEST_SUFFIX") == " as root"
+
 			if len(args) != 1 {
 				return syscall.EINVAL
 			}
@@ -658,6 +712,66 @@ func init() {
 				return fmt.Errorf("gid: %d, want %d", gid, tc.gid)
 			}
 
+			// no attack surface increase during as root due to no_new_privs
+			var wantBounding uintptr = 1
+			asRootNot := " not"
+			if !asRoot {
+				wantBounding = 0
+				asRootNot = ""
+			}
+
+			const (
+				PR_CAP_AMBIENT        = 0x2f
+				PR_CAP_AMBIENT_IS_SET = 0x1
+			)
+			for i := range container.LastCap(nil) + 1 {
+				r, _, errno := syscall.Syscall(
+					syscall.SYS_PRCTL,
+					PR_CAP_AMBIENT,
+					PR_CAP_AMBIENT_IS_SET,
+					i,
+				)
+				if errno != 0 {
+					return os.NewSyscallError("prctl", errno)
+				}
+				if r != 0 {
+					return fmt.Errorf("capability %d in ambient set", i)
+				}
+
+				r, _, errno = syscall.Syscall(
+					syscall.SYS_PRCTL,
+					syscall.PR_CAPBSET_READ,
+					i,
+					0,
+				)
+				if errno != 0 {
+					return os.NewSyscallError("prctl", errno)
+				}
+				if r != wantBounding {
+					return fmt.Errorf("capability %d%s in bounding set", i, asRootNot)
+				}
+			}
+
+			const _LINUX_CAPABILITY_VERSION_3 = 0x20080522
+			var capData struct {
+				effective   uint32
+				permitted   uint32
+				inheritable uint32
+			}
+			if _, _, errno := syscall.Syscall(syscall.SYS_CAPGET, uintptr(unsafe.Pointer(&struct {
+				version uint32
+				pid     int32
+			}{_LINUX_CAPABILITY_VERSION_3, 0})), uintptr(unsafe.Pointer(&capData)), 0); errno != 0 {
+				return os.NewSyscallError("capget", errno)
+			}
+
+			if max(capData.effective, capData.permitted, capData.inheritable) != 0 {
+				return fmt.Errorf(
+					"effective = %d, permitted = %d, inheritable = %d",
+					capData.effective, capData.permitted, capData.inheritable,
+				)
+			}
+
 			wantHost := hostnameFromTestCase(tc.name)
 			if host, err := os.Hostname(); err != nil {
 				return fmt.Errorf("cannot get hostname: %v", err)
@@ -775,7 +889,7 @@ func TestMain(m *testing.M) {
 		}
 		c.MustParse(os.Args[1:], func(err error) {
 			if err != nil {
-				log.Fatal(err.Error())
+				log.Fatal(err)
 			}
 		})
 		return

container/init.go

@@ -11,11 +11,13 @@ import (
 	"path/filepath"
 	"slices"
 	"strconv"
+	"strings"
 	"sync"
 	"sync/atomic"
 	. "syscall"
 	"time"
 
+	"hakurei.app/check"
 	"hakurei.app/container/seccomp"
 	"hakurei.app/ext"
 	"hakurei.app/fhs"
@@ -182,23 +184,33 @@ func initEntrypoint(k syscallDispatcher, msg message.Msg) {
 		cancel()
 	}
 
+	uid, gid := param.Uid, param.Gid
+	if param.InitAsRoot {
+		uid, gid = 0, 0
+	}
+
 	// write uid/gid map here so parent does not need to set dumpable
 	if err := k.setDumpable(ext.SUID_DUMP_USER); err != nil {
 		k.fatalf(msg, "cannot set SUID_DUMP_USER: %v", err)
 	}
-	if err := k.writeFile(fhs.Proc+"self/uid_map",
+	if err := k.writeFile(
-		append([]byte{}, strconv.Itoa(param.Uid)+" "+strconv.Itoa(param.HostUid)+" 1\n"...),
+		fhs.Proc+"self/uid_map",
-		0); err != nil {
+		[]byte(strconv.Itoa(uid)+" "+strconv.Itoa(param.HostUid)+" 1\n"),
+		0,
+	); err != nil {
 		k.fatalf(msg, "%v", err)
 	}
-	if err := k.writeFile(fhs.Proc+"self/setgroups",
+	if err := k.writeFile(
+		fhs.Proc+"self/setgroups",
 		[]byte("deny\n"),
-		0); err != nil && !os.IsNotExist(err) {
+		0,
+	); err != nil && !os.IsNotExist(err) {
 		k.fatalf(msg, "%v", err)
 	}
 	if err := k.writeFile(fhs.Proc+"self/gid_map",
-		append([]byte{}, strconv.Itoa(param.Gid)+" "+strconv.Itoa(param.HostGid)+" 1\n"...),
+		[]byte(strconv.Itoa(gid)+" "+strconv.Itoa(param.HostGid)+" 1\n"),
-		0); err != nil {
+		0,
+	); err != nil {
 		k.fatalf(msg, "%v", err)
 	}
 	if err := k.setDumpable(ext.SUID_DUMP_DISABLE); err != nil {
@@ -223,6 +235,23 @@ func initEntrypoint(k syscallDispatcher, msg message.Msg) {
 	state := &setupState{process: make(map[int]WaitStatus), Params: &param.Params, Msg: msg, Context: ctx}
 	defer cancel()
 
+	if err := k.mount(SourceTmpfsRootfs, intermediateHostPath, FstypeTmpfs, MS_NODEV|MS_NOSUID, zeroString); err != nil {
+		k.fatalf(msg, "cannot mount intermediate root: %v", optionalErrorUnwrap(err))
+	}
+	if err := k.chdir(intermediateHostPath); err != nil {
+		k.fatalf(msg, "cannot enter intermediate host path: %v", err)
+	}
+
+	if len(param.Binfmt) > 0 {
+		for i, e := range param.Binfmt {
+			if pathname, err := k.evalSymlinks(e.Interpreter.String()); err != nil {
+				k.fatal(msg, err)
+			} else if param.Binfmt[i].Interpreter, err = check.NewAbs(pathname); err != nil {
+				k.fatal(msg, err)
+			}
+		}
+	}
+
 	/* early is called right before pivot_root into intermediate root;
 	this step is mostly for gathering information that would otherwise be
 	difficult to obtain via library functions after pivot_root, and
@@ -242,13 +271,6 @@ func initEntrypoint(k syscallDispatcher, msg message.Msg) {
 		}
 	}
 
-	if err := k.mount(SourceTmpfsRootfs, intermediateHostPath, FstypeTmpfs, MS_NODEV|MS_NOSUID, zeroString); err != nil {
-		k.fatalf(msg, "cannot mount intermediate root: %v", optionalErrorUnwrap(err))
-	}
-	if err := k.chdir(intermediateHostPath); err != nil {
-		k.fatalf(msg, "cannot enter intermediate host path: %v", err)
-	}
-
 	if err := k.mkdir(sysrootDir, 0755); err != nil {
 		k.fatalf(msg, "%v", err)
 	}
@@ -285,6 +307,48 @@ func initEntrypoint(k syscallDispatcher, msg message.Msg) {
 		}
 	}
 
+	if len(param.Binfmt) > 0 {
+		const interpreter = "/interpreter"
+
+		if param.BinfmtPath == nil {
+			param.BinfmtPath = fhs.AbsProcSys.Append("fs/binfmt_misc")
+		}
+		binfmt := sysrootPath + param.BinfmtPath.String()
+		if err := k.mkdirAll(binfmt, 0); err != nil {
+			k.fatal(msg, err)
+		}
+		if err := k.mount(
+			SourceBinfmtMisc,
+			binfmt,
+			FstypeBinfmtMisc,
+			MS_NOSUID|MS_NOEXEC|MS_NODEV,
+			zeroString,
+		); err != nil {
+			k.fatal(msg, err)
+		}
+
+		var buf strings.Builder
+		buf.Grow(1920)
+
+		register := binfmt + "/register"
+		for i, e := range param.Binfmt {
+			if err := k.symlink(hostPath+e.Interpreter.String(), interpreter); err != nil {
+				k.fatal(msg, err)
+			} else if err = k.writeFile(register, []byte(":"+
+				strconv.Itoa(i)+":"+
+				"M:"+
+				strconv.Itoa(int(e.Offset))+":"+
+				escapeBinfmt(&buf, e.Magic)+":"+
+				escapeBinfmt(&buf, e.Mask)+":"+
+				interpreter+":"+
+				"F"), 0); err != nil {
+				k.fatal(msg, err)
+			} else if err = k.remove(interpreter); err != nil {
+				k.fatal(msg, err)
+			}
+		}
+	}
+
 	// setup requiring host root complete at this point
 	if err := k.mount(hostDir, hostDir, zeroString, MS_SILENT|MS_REC|MS_PRIVATE, zeroString); err != nil {
 		k.fatalf(msg, "cannot make host root rprivate: %v", optionalErrorUnwrap(err))
@@ -323,11 +387,19 @@ func initEntrypoint(k syscallDispatcher, msg message.Msg) {
 		}
 	}
 
+	var keepCaps []uintptr
+	if param.Privileged {
+		keepCaps = append(keepCaps, CAP_SYS_ADMIN, CAP_SETPCAP)
+	}
+	if param.InitAsRoot {
+		keepCaps = append(keepCaps, CAP_SETFCAP)
+	}
+
 	if err := k.capAmbientClearAll(); err != nil {
 		k.fatalf(msg, "cannot clear the ambient capability set: %v", err)
 	}
-	for i := uintptr(0); i <= lastcap; i++ {
+	for i := range lastcap + 1 {
-		if param.Privileged && i == CAP_SYS_ADMIN {
+		if slices.Contains(keepCaps, i) {
 			continue
 		}
 		if err := k.capBoundingSetDrop(i); err != nil {
@@ -336,20 +408,23 @@ func initEntrypoint(k syscallDispatcher, msg message.Msg) {
 	}
 
 	var keep [2]uint32
-	if param.Privileged {
+	for _, c := range keepCaps {
-		keep[capToIndex(CAP_SYS_ADMIN)] |= capToMask(CAP_SYS_ADMIN)
+		keep[capToIndex(c)] |= capToMask(c)
-
-		if err := k.capAmbientRaise(CAP_SYS_ADMIN); err != nil {
-			k.fatalf(msg, "cannot raise CAP_SYS_ADMIN: %v", err)
-		}
 	}
+
 	if err := k.capset(
 		&capHeader{_LINUX_CAPABILITY_VERSION_3, 0},
-		&[2]capData{{0, keep[0], keep[0]}, {0, keep[1], keep[1]}},
+		&[2]capData{{keep[0], keep[0], keep[0]}, {keep[1], keep[1], keep[1]}},
 	); err != nil {
 		k.fatalf(msg, "cannot capset: %v", err)
 	}
 
+	for _, c := range keepCaps {
+		if err := k.capAmbientRaise(c); err != nil {
+			k.fatalf(msg, "cannot raise %#x: %v", c, err)
+		}
+	}
+
 	if !param.SeccompDisable {
 		rules := param.SeccompRules
 		if len(rules) == 0 { // non-empty rules slice always overrides presets
@@ -474,6 +549,14 @@ func initEntrypoint(k syscallDispatcher, msg message.Msg) {
 	cmd.ExtraFiles = extraFiles
 	cmd.Dir = param.Dir.String()
 
+	if param.InitAsRoot {
+		cmd.SysProcAttr = &SysProcAttr{
+			Cloneflags:  CLONE_NEWUSER,
+			UidMappings: []SysProcIDMap{{ContainerID: param.Uid, HostID: 0, Size: 1}},
+			GidMappings: []SysProcIDMap{{ContainerID: param.Gid, HostID: 0, Size: 1}},
+		}
+	}
+
 	msg.Verbosef("starting initial process %s", param.Path)
 	if err := k.start(cmd); err != nil {
 		k.fatalf(msg, "%v", err)

container/init_test.go

@@ -332,6 +332,8 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("fatalf", stub.ExpectArgs{"invalid op at index %d", []any{0}}, nil, nil),
 				/* end early */
@@ -370,6 +372,8 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("fatalf", stub.ExpectArgs{"invalid op at index %d", []any{0}}, nil, nil),
 				/* end early */
@@ -408,6 +412,8 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", stub.UniqueError(61)),
 				call("fatalf", stub.ExpectArgs{"cannot prepare op at index %d: %v", []any{0, stub.UniqueError(61)}}, nil, nil),
@@ -447,6 +453,8 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", &os.PathError{Op: "readlink", Path: "/", Err: stub.UniqueError(60)}),
 				call("fatal", stub.ExpectArgs{[]any{"cannot readlink /: unique error 60 injected by the test suite"}}, nil, nil),
@@ -486,9 +494,6 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
-				/* begin early */
-				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
-				/* end early */
 				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, stub.UniqueError(58)),
 				call("fatalf", stub.ExpectArgs{"cannot mount intermediate root: %v", []any{stub.UniqueError(58)}}, nil, nil),
 			},
@@ -526,9 +531,6 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
-				/* begin early */
-				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
-				/* end early */
 				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
 				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, stub.UniqueError(56)),
 				call("fatalf", stub.ExpectArgs{"cannot enter intermediate host path: %v", []any{stub.UniqueError(56)}}, nil, nil),
@@ -567,11 +569,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, stub.UniqueError(54)),
 				call("fatalf", stub.ExpectArgs{"%v", []any{stub.UniqueError(54)}}, nil, nil),
 			},
@@ -609,11 +611,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, stub.UniqueError(52)),
 				call("fatalf", stub.ExpectArgs{"cannot bind sysroot: %v", []any{stub.UniqueError(52)}}, nil, nil),
@@ -652,11 +654,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, stub.UniqueError(50)),
@@ -696,11 +698,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -741,11 +743,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -787,11 +789,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -842,11 +844,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -897,11 +899,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -953,11 +955,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1010,11 +1012,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1069,11 +1071,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1129,11 +1131,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1190,11 +1192,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1252,11 +1254,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1315,11 +1317,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1379,11 +1381,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1444,11 +1446,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1510,11 +1512,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1584,11 +1586,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1622,7 +1624,6 @@ func TestInitEntrypoint(t *testing.T) {
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x5)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x6)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x7)}, nil, nil),
-				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x8)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x9)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0xa)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0xb)}, nil, nil),
@@ -1654,8 +1655,9 @@ func TestInitEntrypoint(t *testing.T) {
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x26)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x27)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x28)}, nil, nil),
+				call("capset", stub.ExpectArgs{&capHeader{_LINUX_CAPABILITY_VERSION_3, 0}, &[2]capData{{0x200100, 0x200100, 0x200100}, {0, 0, 0}}}, nil, nil),
 				call("capAmbientRaise", stub.ExpectArgs{uintptr(0x15)}, nil, stub.UniqueError(19)),
-				call("fatalf", stub.ExpectArgs{"cannot raise CAP_SYS_ADMIN: %v", []any{stub.UniqueError(19)}}, nil, nil),
+				call("fatalf", stub.ExpectArgs{"cannot raise %#x: %v", []any{uintptr(0x15), stub.UniqueError(19)}}, nil, nil),
 			},
 		}, nil},
 
@@ -1691,11 +1693,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1729,7 +1731,6 @@ func TestInitEntrypoint(t *testing.T) {
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x5)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x6)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x7)}, nil, nil),
-				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x8)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x9)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0xa)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0xb)}, nil, nil),
@@ -1761,8 +1762,7 @@ func TestInitEntrypoint(t *testing.T) {
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x26)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x27)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x28)}, nil, nil),
-				call("capAmbientRaise", stub.ExpectArgs{uintptr(0x15)}, nil, nil),
+				call("capset", stub.ExpectArgs{&capHeader{_LINUX_CAPABILITY_VERSION_3, 0}, &[2]capData{{0x200100, 0x200100, 0x200100}, {0, 0, 0}}}, nil, stub.UniqueError(17)),
-				call("capset", stub.ExpectArgs{&capHeader{_LINUX_CAPABILITY_VERSION_3, 0}, &[2]capData{{0, 0x200000, 0x200000}, {0, 0, 0}}}, nil, stub.UniqueError(17)),
 				call("fatalf", stub.ExpectArgs{"cannot capset: %v", []any{stub.UniqueError(17)}}, nil, nil),
 			},
 		}, nil},
@@ -1799,11 +1799,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -1837,7 +1837,6 @@ func TestInitEntrypoint(t *testing.T) {
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x5)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x6)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x7)}, nil, nil),
-				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x8)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x9)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0xa)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0xb)}, nil, nil),
@@ -1869,8 +1868,9 @@ func TestInitEntrypoint(t *testing.T) {
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x26)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x27)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x28)}, nil, nil),
+				call("capset", stub.ExpectArgs{&capHeader{_LINUX_CAPABILITY_VERSION_3, 0}, &[2]capData{{0x200100, 0x200100, 0x200100}, {0, 0, 0}}}, nil, nil),
 				call("capAmbientRaise", stub.ExpectArgs{uintptr(0x15)}, nil, nil),
-				call("capset", stub.ExpectArgs{&capHeader{_LINUX_CAPABILITY_VERSION_3, 0}, &[2]capData{{0, 0x200000, 0x200000}, {0, 0, 0}}}, nil, nil),
+				call("capAmbientRaise", stub.ExpectArgs{uintptr(0x8)}, nil, nil),
 				call("verbosef", stub.ExpectArgs{"resolving presets %#x", []any{std.FilterPreset(0xf)}}, nil, nil),
 				call("seccompLoad", stub.ExpectArgs{seccomp.Preset(0xf, 0), seccomp.ExportFlag(0)}, nil, stub.UniqueError(15)),
 				call("fatalf", stub.ExpectArgs{"cannot load syscall filter: %v", []any{stub.UniqueError(15)}}, nil, nil),
@@ -1908,11 +1908,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -2032,11 +2032,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(4), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -2132,11 +2132,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(4), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -2232,11 +2232,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(4), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -2323,11 +2323,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(4), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -2418,11 +2418,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(4), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -2520,11 +2520,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -2659,11 +2659,11 @@ func TestInitEntrypoint(t *testing.T) {
 				call("sethostname", stub.ExpectArgs{[]byte("hakurei-check")}, nil, nil),
 				call("lastcap", stub.ExpectArgs{}, uintptr(40), nil),
 				call("mount", stub.ExpectArgs{"", "/", "", uintptr(0x8c000), ""}, nil, nil),
+				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
+				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				/* begin early */
 				call("evalSymlinks", stub.ExpectArgs{"/"}, "/", nil),
 				/* end early */
-				call("mount", stub.ExpectArgs{"rootfs", "/proc/self/fd", "tmpfs", uintptr(6), ""}, nil, nil),
-				call("chdir", stub.ExpectArgs{"/proc/self/fd"}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"sysroot", os.FileMode(0755)}, nil, nil),
 				call("mount", stub.ExpectArgs{"sysroot", "sysroot", "", uintptr(0xd000), ""}, nil, nil),
 				call("mkdir", stub.ExpectArgs{"host", os.FileMode(0755)}, nil, nil),
@@ -2697,7 +2697,6 @@ func TestInitEntrypoint(t *testing.T) {
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x5)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x6)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x7)}, nil, nil),
-				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x8)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x9)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0xa)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0xb)}, nil, nil),
@@ -2729,8 +2728,9 @@ func TestInitEntrypoint(t *testing.T) {
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x26)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x27)}, nil, nil),
 				call("capBoundingSetDrop", stub.ExpectArgs{uintptr(0x28)}, nil, nil),
+				call("capset", stub.ExpectArgs{&capHeader{_LINUX_CAPABILITY_VERSION_3, 0}, &[2]capData{{0x200100, 0x200100, 0x200100}, {0, 0, 0}}}, nil, nil),
 				call("capAmbientRaise", stub.ExpectArgs{uintptr(0x15)}, nil, nil),
-				call("capset", stub.ExpectArgs{&capHeader{_LINUX_CAPABILITY_VERSION_3, 0}, &[2]capData{{0, 0x200000, 0x200000}, {0, 0, 0}}}, nil, nil),
+				call("capAmbientRaise", stub.ExpectArgs{uintptr(0x8)}, nil, nil),
 				call("verbosef", stub.ExpectArgs{"resolving presets %#x", []any{std.FilterPreset(0xf)}}, nil, nil),
 				call("seccompLoad", stub.ExpectArgs{seccomp.Preset(0xf, 0), seccomp.ExportFlag(0)}, nil, nil),
 				call("verbosef", stub.ExpectArgs{"%d filter rules loaded", []any{73}}, nil, nil),

container/mount.go

@@ -40,6 +40,9 @@ const (
 	// SourceMqueue is used when mounting mqueue.
 	// Note that any source value is allowed when fstype is [FstypeMqueue].
 	SourceMqueue = "mqueue"
+	// SourceBinfmtMisc is used when mounting binfmt_misc.
+	// Note that any source value is allowed when fstype is [SourceBinfmtMisc].
+	SourceBinfmtMisc = "binfmt_misc"
 	// SourceOverlay is used when mounting overlay.
 	// Note that any source value is allowed when fstype is [FstypeOverlay].
 	SourceOverlay = "overlay"
@@ -70,6 +73,9 @@ const (
 	// FstypeMqueue represents the mqueue pseudo-filesystem.
 	// This filesystem type is usually mounted on /dev/mqueue.
 	FstypeMqueue = "mqueue"
+	// FstypeBinfmtMisc represents the binfmt_misc pseudo-filesystem.
+	// This filesystem type is usually mounted on /proc/sys/fs/binfmt_misc.
+	FstypeBinfmtMisc = "binfmt_misc"
 	// FstypeOverlay represents the overlay pseudo-filesystem.
 	// This filesystem type can be mounted anywhere in the container filesystem.
 	FstypeOverlay = "overlay"

fhs/abs.go

@@ -42,6 +42,8 @@ var (
 	AbsDevShm = unsafeAbs(DevShm)
 	// AbsProc is [Proc] as [check.Absolute].
 	AbsProc = unsafeAbs(Proc)
+	// AbsProcSys is [ProcSys] as [check.Absolute].
+	AbsProcSys = unsafeAbs(ProcSys)
 	// AbsProcSelfExe is [ProcSelfExe] as [check.Absolute].
 	AbsProcSelfExe = unsafeAbs(ProcSelfExe)
 	// AbsSys is [Sys] as [check.Absolute].

internal/pkg/dir_test.go

@@ -64,78 +64,6 @@ func TestFlatten(t *testing.T) {
 			{Mode: fs.ModeDir | 0700, Path: "work"},
 		}, pkg.MustDecode("E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C"), nil},
 
-		{"sample cache file", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX": {Mode: 0400, Data: []byte{0}},
-			"checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq": {Mode: 0400, Data: []byte{0, 0, 0, 0, 0xad, 0xb, 0, 4, 0xfe, 0xfe, 0, 0, 0xfe, 0xca, 0, 0}},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX")},
-			"identifier/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
-			"identifier/cafebabecafebabecafebabecafebabecafebabecafebabecafebabecafebabe": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
-			"identifier/deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
-
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: 0400, Path: "checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq", Data: []byte{0, 0, 0, 0, 0xad, 0xb, 0, 4, 0xfe, 0xfe, 0, 0, 0xfe, 0xca, 0, 0}},
-			{Mode: 0400, Path: "checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX", Data: []byte{0}},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq", Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/cafebabecafebabecafebabecafebabecafebabecafebabecafebabecafebabe", Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef", Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX", Data: []byte("../checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX")},
-
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("St9rlE-mGZ5gXwiv_hzQ_B8bZP-UUvSNmf4nHUZzCMOumb6hKnheZSe0dmnuc4Q2"), nil},
-
-		{"sample http get cure", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU": {Mode: 0400, Data: []byte("\x7f\xe1\x69\xa2\xdd\x63\x96\x26\x83\x79\x61\x8b\xf0\x3f\xd5\x16\x9a\x39\x3a\xdb\xcf\xb1\xbc\x8d\x33\xff\x75\xee\x62\x56\xa9\xf0\x27\xac\x13\x94\x69")},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/oM-2pUlk-mOxK1t3aMWZer69UdOQlAXiAgMrpZ1476VoOqpYVP1aGFS9_HYy-D8_": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU")},
-
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: 0400, Path: "checksum/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU", Data: []byte("\x7f\xe1\x69\xa2\xdd\x63\x96\x26\x83\x79\x61\x8b\xf0\x3f\xd5\x16\x9a\x39\x3a\xdb\xcf\xb1\xbc\x8d\x33\xff\x75\xee\x62\x56\xa9\xf0\x27\xac\x13\x94\x69")},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/oM-2pUlk-mOxK1t3aMWZer69UdOQlAXiAgMrpZ1476VoOqpYVP1aGFS9_HYy-D8_", Data: []byte("../checksum/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU")},
-
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("L_0RFHpr9JUS4Zp14rz2dESSRvfLzpvqsLhR1-YjQt8hYlmEdVl7vI3_-v8UNPKs"), nil},
-
-		{"sample directory step simple", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0500},
-
-			"check": {Mode: 0400, Data: []byte{0, 0}},
-
-			"lib":            {Mode: fs.ModeDir | 0700},
-			"lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
-
-			"lib/pkgconfig": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0500, Path: "."},
-
-			{Mode: 0400, Path: "check", Data: []byte{0, 0}},
-
-			{Mode: fs.ModeDir | 0700, Path: "lib"},
-			{Mode: fs.ModeSymlink | 0777, Path: "lib/libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},
-
-			{Mode: fs.ModeDir | 0700, Path: "lib/pkgconfig"},
-		}, pkg.MustDecode("qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b"), nil},
-
 		{"sample directory step garbage", fstest.MapFS{
 			".": {Mode: fs.ModeDir | 0500},
 
@@ -151,421 +79,6 @@ func TestFlatten(t *testing.T) {
 
 			{Mode: fs.ModeDir | 0500, Path: "lib/pkgconfig"},
 		}, pkg.MustDecode("CUx-3hSbTWPsbMfDhgalG4Ni_GmR9TnVX8F99tY_P5GtkYvczg9RrF5zO0jX9XYT"), nil},
-
-		{"sample directory", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b":                {Mode: fs.ModeDir | 0500},
-			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/check":          {Mode: 0400, Data: []byte{0, 0}},
-			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib":            {Mode: fs.ModeDir | 0700},
-			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib/pkgconfig":  {Mode: fs.ModeDir | 0700},
-			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
-			"identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
-
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b"},
-			{Mode: 0400, Path: "checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/check", Data: []byte{0, 0}},
-			{Mode: fs.ModeDir | 0700, Path: "checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib"},
-			{Mode: fs.ModeSymlink | 0777, Path: "checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib/libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},
-			{Mode: fs.ModeDir | 0700, Path: "checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib/pkgconfig"},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY", Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa", Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
-
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("WVpvsVqVKg9Nsh744x57h51AuWUoUR2nnh8Md-EYBQpk6ziyTuUn6PLtF2e0Eu_d"), nil},
-
-		{"sample no assume checksum", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M":       {Mode: fs.ModeDir | 0500},
-			"checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M/check": {Mode: 0400, Data: []byte{}},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/_wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M")},
-			"identifier/_wEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M")},
-
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M"},
-			{Mode: 0400, Path: "checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M/check", Data: []byte{}},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/_wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", Data: []byte("../checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/_wEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", Data: []byte("../checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M")},
-
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("OC290t23aimNo2Rp2pPwan5GI2KRLRdOwYxXQMD9jw0QROgHnNXWodoWdV0hwu2w"), nil},
-
-		{"sample tar step unpack", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0500},
-
-			"checksum": {Mode: fs.ModeDir | 0500},
-			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP":                {Mode: fs.ModeDir | 0500},
-			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check":          {Mode: 0400, Data: []byte{0, 0}},
-			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib":            {Mode: fs.ModeDir | 0500},
-			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig":  {Mode: fs.ModeDir | 0500},
-			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
-
-			"identifier": {Mode: fs.ModeDir | 0500},
-			"identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
-			"identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
-
-			"work": {Mode: fs.ModeDir | 0500},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0500, Path: "."},
-
-			{Mode: fs.ModeDir | 0500, Path: "checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP"},
-			{Mode: 0400, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check", Data: []byte{0, 0}},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib"},
-			{Mode: fs.ModeSymlink | 0777, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig"},
-
-			{Mode: fs.ModeDir | 0500, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY", Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa", Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
-
-			{Mode: fs.ModeDir | 0500, Path: "work"},
-		}, pkg.MustDecode("cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM"), nil},
-
-		{"sample tar", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM":                                                                                          {Mode: fs.ModeDir | 0500},
-			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum":                                                                                 {Mode: fs.ModeDir | 0500},
-			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP":                {Mode: fs.ModeDir | 0500},
-			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check":          {Mode: 0400, Data: []byte{0, 0}},
-			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib":            {Mode: fs.ModeDir | 0500},
-			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
-			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig":  {Mode: fs.ModeDir | 0500},
-			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier":                                                                               {Mode: fs.ModeDir | 0500},
-			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY":              {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
-			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa":              {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
-			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/work":                                                                                     {Mode: fs.ModeDir | 0500},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/W5S65DEhawz_WKaok5NjUKLmnD9dNl5RPauNJjcOVcB3VM4eGhSaLGmXbL8vZpiw": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM")},
-			"identifier/rg7F1D5hwv6o4xctjD5zDq4i5MD0mArTsUIWfhUbik8xC6Bsyt3mjXXOm3goojTz": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM")},
-
-			"temp": {Mode: fs.ModeDir | 0700},
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP"},
-			{Mode: 0400, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check", Data: []byte{0, 0}},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib"},
-			{Mode: fs.ModeSymlink | 0777, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY", Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
-			{Mode: fs.ModeSymlink | 0777, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa", Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/work"},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/W5S65DEhawz_WKaok5NjUKLmnD9dNl5RPauNJjcOVcB3VM4eGhSaLGmXbL8vZpiw", Data: []byte("../checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/rg7F1D5hwv6o4xctjD5zDq4i5MD0mArTsUIWfhUbik8xC6Bsyt3mjXXOm3goojTz", Data: []byte("../checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM")},
-
-			{Mode: fs.ModeDir | 0700, Path: "temp"},
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("NQTlc466JmSVLIyWklm_u8_g95jEEb98PxJU-kjwxLpfdjwMWJq0G8ze9R4Vo1Vu"), nil},
-
-		{"sample tar expand step unpack", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0500},
-
-			"libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0500, Path: "."},
-
-			{Mode: fs.ModeSymlink | 0777, Path: "libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},
-		}, pkg.MustDecode("CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN"), nil},
-
-		{"sample tar expand", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN":            {Mode: fs.ModeDir | 0500},
-			"checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/W5S65DEhawz_WKaok5NjUKLmnD9dNl5RPauNJjcOVcB3VM4eGhSaLGmXbL8vZpiw": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN")},
-			"identifier/_v1blm2h-_KA-dVaawdpLas6MjHc6rbhhFS8JWwx8iJxZGUu8EBbRrhr5AaZ9PJL": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN")},
-
-			"temp": {Mode: fs.ModeDir | 0700},
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN"},
-			{Mode: fs.ModeSymlink | 0777, Path: "checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN/libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/W5S65DEhawz_WKaok5NjUKLmnD9dNl5RPauNJjcOVcB3VM4eGhSaLGmXbL8vZpiw", Data: []byte("../checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/_v1blm2h-_KA-dVaawdpLas6MjHc6rbhhFS8JWwx8iJxZGUu8EBbRrhr5AaZ9PJL", Data: []byte("../checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN")},
-
-			{Mode: fs.ModeDir | 0700, Path: "temp"},
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("hSoSSgCYTNonX3Q8FjvjD1fBl-E-BQyA6OTXro2OadXqbST4tZ-akGXszdeqphRe"), nil},
-
-		{"testtool", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0500},
-
-			"check": {Mode: 0400, Data: []byte{0}},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0500, Path: "."},
-
-			{Mode: 0400, Path: "check", Data: []byte{0}},
-		}, pkg.MustDecode("GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"), nil},
-
-		{"sample exec container", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9":       {Mode: fs.ModeDir | 0500},
-			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check": {Mode: 0400, Data: []byte{0}},
-			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},
-			"checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb":       {Mode: 0400, Data: []byte{}},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
-			"identifier/dztPS6jRjiZtCF4_p8AzfnxGp6obkhrgFVsxdodbKWUoAEVtDz3MykepJB4kI_ks": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
-			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-
-			"temp": {Mode: fs.ModeDir | 0700},
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"},
-			{Mode: 0400, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check", Data: []byte{0}},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},
-			{Mode: 0400, Path: "checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb", Data: []byte{}},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/dztPS6jRjiZtCF4_p8AzfnxGp6obkhrgFVsxdodbKWUoAEVtDz3MykepJB4kI_ks", Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-
-			{Mode: fs.ModeDir | 0700, Path: "temp"},
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("Q5DluWQCAeohLoiGRImurwFp3vdz9IfQCoj7Fuhh73s4KQPRHpEQEnHTdNHmB8Fx"), nil},
-
-		{"testtool net", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0500},
-
-			"check": {Mode: 0400, Data: []byte("net")},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0500, Path: "."},
-
-			{Mode: 0400, Path: "check", Data: []byte("net")},
-		}, pkg.MustDecode("a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W"), nil},
-
-		{"sample exec net container", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},
-			"checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb":       {Mode: 0400, Data: []byte{}},
-			"checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W":       {Mode: fs.ModeDir | 0500},
-			"checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W/check": {Mode: 0400, Data: []byte("net")},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/G8qPxD9puvvoOVV7lrT80eyDeIl3G_CCFoKw12c8mCjMdG1zF7NEPkwYpNubClK3": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W")},
-			"identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
-			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-
-			"temp": {Mode: fs.ModeDir | 0700},
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},
-			{Mode: 0400, Path: "checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb", Data: []byte{}},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W"},
-			{Mode: 0400, Path: "checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W/check", Data: []byte("net")},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/G8qPxD9puvvoOVV7lrT80eyDeIl3G_CCFoKw12c8mCjMdG1zF7NEPkwYpNubClK3", Data: []byte("../checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-
-			{Mode: fs.ModeDir | 0700, Path: "temp"},
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("bPYvvqxpfV7xcC1EptqyKNK1klLJgYHMDkzBcoOyK6j_Aj5hb0mXNPwTwPSK5F6Z"), nil},
-
-		{"sample exec container overlay root", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9":       {Mode: fs.ModeDir | 0500},
-			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check": {Mode: 0400, Data: []byte{0}},
-			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/RdMA-mubnrHuu3Ky1wWyxauSYCO0ZH_zCPUj3uDHqkfwv5sGcByoF_g5PjlGiClb": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
-			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-
-			"temp": {Mode: fs.ModeDir | 0700},
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"},
-			{Mode: 0400, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check", Data: []byte{0}},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/RdMA-mubnrHuu3Ky1wWyxauSYCO0ZH_zCPUj3uDHqkfwv5sGcByoF_g5PjlGiClb", Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-
-			{Mode: fs.ModeDir | 0700, Path: "temp"},
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("PO2DSSCa4yoSgEYRcCSZfQfwow1yRigL3Ry-hI0RDI4aGuFBha-EfXeSJnG_5_Rl"), nil},
-
-		{"sample exec container overlay work", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9":       {Mode: fs.ModeDir | 0500},
-			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check": {Mode: 0400, Data: []byte{0}},
-			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/5hlaukCirnXE4W_RSLJFOZN47Z5RiHnacXzdFp_70cLgiJUGR6cSb_HaFftkzi0-": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
-			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-
-			"temp": {Mode: fs.ModeDir | 0700},
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"},
-			{Mode: 0400, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check", Data: []byte{0}},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/5hlaukCirnXE4W_RSLJFOZN47Z5RiHnacXzdFp_70cLgiJUGR6cSb_HaFftkzi0-", Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-
-			{Mode: fs.ModeDir | 0700, Path: "temp"},
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("iaRt6l_Wm2n-h5UsDewZxQkCmjZjyL8r7wv32QT2kyV55-Lx09Dq4gfg9BiwPnKs"), nil},
-
-		{"sample exec container multiple layers", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9":       {Mode: fs.ModeDir | 0500},
-			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check": {Mode: 0400, Data: []byte{0}},
-			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},
-			"checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb":       {Mode: 0400, Data: []byte{}},
-			"checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK":       {Mode: fs.ModeDir | 0500},
-			"checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK/check": {Mode: 0400, Data: []byte("layers")},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
-			"identifier/B-kc5iJMx8GtlCua4dz6BiJHnDAOUfPjgpbKq4e-QEn0_CZkSYs3fOA1ve06qMs2": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK")},
-			"identifier/p1t_drXr34i-jZNuxDMLaMOdL6tZvQqhavNafGynGqxOZoXAUTSn7kqNh3Ovv3DT": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
-			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-
-			"temp": {Mode: fs.ModeDir | 0700},
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"},
-			{Mode: 0400, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check", Data: []byte{0}},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},
-			{Mode: 0400, Path: "checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb", Data: []byte{}},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK"},
-			{Mode: 0400, Path: "checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK/check", Data: []byte("layers")},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/B-kc5iJMx8GtlCua4dz6BiJHnDAOUfPjgpbKq4e-QEn0_CZkSYs3fOA1ve06qMs2", Data: []byte("../checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/p1t_drXr34i-jZNuxDMLaMOdL6tZvQqhavNafGynGqxOZoXAUTSn7kqNh3Ovv3DT", Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-
-			{Mode: fs.ModeDir | 0700, Path: "temp"},
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("O2YzyR7IUGU5J2CADy0hUZ3A5NkP_Vwzs4UadEdn2oMZZVWRtH0xZGJ3HXiimTnZ"), nil},
-
-		{"sample exec container layer promotion", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9":       {Mode: fs.ModeDir | 0500},
-			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check": {Mode: 0400, Data: []byte{0}},
-			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/kvJIqZo5DKFOxC2ZQ-8_nPaQzEAz9cIm3p6guO-uLqm-xaiPu7oRkSnsu411jd_U": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-			"identifier/xXTIYcXmgJWNLC91c417RRrNM9cjELwEZHpGvf8Fk_GNP5agRJp_SicD0w9aMeLJ": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
-
-			"temp": {Mode: fs.ModeDir | 0700},
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"},
-			{Mode: 0400, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check", Data: []byte{0}},
-			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/kvJIqZo5DKFOxC2ZQ-8_nPaQzEAz9cIm3p6guO-uLqm-xaiPu7oRkSnsu411jd_U", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/xXTIYcXmgJWNLC91c417RRrNM9cjELwEZHpGvf8Fk_GNP5agRJp_SicD0w9aMeLJ", Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
-
-			{Mode: fs.ModeDir | 0700, Path: "temp"},
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("3EaW6WibLi9gl03_UieiFPaFcPy5p4x3JPxrnLJxGaTI-bh3HU9DK9IMx7c3rrNm"), nil},
-
-		{"sample file short", fstest.MapFS{
-			".": {Mode: fs.ModeDir | 0700},
-
-			"checksum": {Mode: fs.ModeDir | 0700},
-			"checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX": {Mode: 0400, Data: []byte{0}},
-
-			"identifier": {Mode: fs.ModeDir | 0700},
-			"identifier/3376ALA7hIUm2LbzH2fDvRezgzod1eTK_G6XjyOgbM2u-6swvkFaF0BOwSl_juBi": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX")},
-
-			"work": {Mode: fs.ModeDir | 0700},
-		}, []pkg.FlatEntry{
-			{Mode: fs.ModeDir | 0700, Path: "."},
-			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: 0400, Path: "checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX", Data: []byte{0}},
-
-			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: fs.ModeSymlink | 0777, Path: "identifier/3376ALA7hIUm2LbzH2fDvRezgzod1eTK_G6XjyOgbM2u-6swvkFaF0BOwSl_juBi", Data: []byte("../checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX")},
-
-			{Mode: fs.ModeDir | 0700, Path: "work"},
-		}, pkg.MustDecode("iR6H5OIsyOW4EwEgtm9rGzGF6DVtyHLySEtwnFE8bnus9VJcoCbR4JIek7Lw-vwT"), nil},
 	}
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {

internal/pkg/exec.go

@@ -9,8 +9,10 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"slices"
 	"strconv"
+	"sync"
 	"syscall"
 	"time"
 	"unique"
@@ -94,6 +96,32 @@ func MustPath(pathname string, writable bool, a ...Artifact) ExecPath {
 	return ExecPath{check.MustAbs(pathname), a, writable}
 }
 
+var (
+	binfmt   map[string]container.BinfmtEntry
+	binfmtMu sync.RWMutex
+)
+
+// RegisterArch arranges for [KindExec] and [KindExecNet] to support a new
+// architecture via a binfmt_misc entry. Each architecture must be registered
+// at most once.
+func RegisterArch(arch string, e container.BinfmtEntry) {
+	if arch == "" {
+		panic(UnsupportedArchError(arch))
+	}
+
+	binfmtMu.Lock()
+	defer binfmtMu.Unlock()
+
+	if binfmt == nil {
+		binfmt = make(map[string]container.BinfmtEntry)
+	}
+
+	if _, ok := binfmt[arch]; ok {
+		panic("attempting to register " + strconv.Quote(arch) + " twice")
+	}
+	binfmt[arch] = e
+}
+
 const (
 	// ExecTimeoutDefault replaces out of range [NewExec] timeout values.
 	ExecTimeoutDefault = 15 * time.Minute
@@ -110,6 +138,8 @@ type execArtifact struct {
 	// Caller-supplied user-facing reporting name, guaranteed to be nonzero
 	// during initialisation.
 	name string
+	// Target architecture.
+	arch string
 	// Caller-supplied inner mount points.
 	paths []ExecPath
 
@@ -132,28 +162,40 @@ type execArtifact struct {
 
 var _ fmt.Stringer = new(execArtifact)
 
-// execNetArtifact is like execArtifact but implements [KnownChecksum] and has
+// execMeasuredArtifact is like execArtifact but implements [KnownChecksum] and
-// its resulting container keep the host net namespace.
+// has its resulting container optionally keep the host net namespace.
-type execNetArtifact struct {
+type execMeasuredArtifact struct {
 	checksum Checksum
 
+	// Whether to keep host net namespace.
+	hostNet bool
+
 	execArtifact
 }
 
-var _ KnownChecksum = new(execNetArtifact)
+var _ KnownChecksum = new(execMeasuredArtifact)
 
 // Checksum returns the caller-supplied checksum.
-func (a *execNetArtifact) Checksum() Checksum { return a.checksum }
+func (a *execMeasuredArtifact) Checksum() Checksum { return a.checksum }
 
-// Kind returns the hardcoded [Kind] constant.
+// Kind returns [KindExecNet], or [KindExec] if hostNet is false.
-func (*execNetArtifact) Kind() Kind { return KindExecNet }
+func (a *execMeasuredArtifact) Kind() Kind {
+	if a == nil || a.hostNet {
+		return KindExecNet
+	}
+	return KindExec
+}
 
 // Cure cures the [Artifact] in the container described by the caller. The
-// container retains host networking.
+// container optionally retains host networking.
-func (a *execNetArtifact) Cure(f *FContext) error {
+func (a *execMeasuredArtifact) Cure(f *FContext) error {
-	return a.cure(f, true)
+	return a.cure(f, a.hostNet)
 }
 
+// ErrNetChecksum is panicked by [NewExec] if host net namespace is requested
+// with a nil checksum.
+var ErrNetChecksum = errors.New("attempting to keep net namespace without checksum")
+
 // NewExec returns a new [Artifact] that executes the program path in a
 // container with specified paths bind mounted read-only in order. A private
 // instance of /proc and /dev is made available to the container.
@@ -167,7 +209,7 @@ func (a *execNetArtifact) Cure(f *FContext) error {
 // regular or symlink.
 //
 // If checksum is non-nil, the resulting [Artifact] implements [KnownChecksum]
-// and its container runs in the host net namespace.
+// and its container optionally runs in the host net namespace.
 //
 // The container is allowed to run for the specified duration before the initial
 // process and all processes originating from it is terminated. A zero or
@@ -178,10 +220,10 @@ func (a *execNetArtifact) Cure(f *FContext) error {
 // container and does not affect curing outcome. Because of this, it is omitted
 // from parameter data for computing identifier.
 func NewExec(
-	name string,
+	name, arch string,
 	checksum *Checksum,
 	timeout time.Duration,
-	exclusive bool,
+	hostNet, exclusive bool,
 
 	dir *check.Absolute,
 	env []string,
@@ -193,17 +235,23 @@ func NewExec(
 	if name == "" {
 		name = "exec-" + filepath.Base(pathname.String())
 	}
+	if arch == "" {
+		arch = runtime.GOARCH
+	}
 	if timeout <= 0 {
 		timeout = ExecTimeoutDefault
 	}
 	if timeout > ExecTimeoutMax {
 		timeout = ExecTimeoutMax
 	}
-	a := execArtifact{name, paths, dir, env, pathname, args, timeout, exclusive}
+	a := execArtifact{name, arch, paths, dir, env, pathname, args, timeout, exclusive}
 	if checksum == nil {
+		if hostNet {
+			panic(ErrNetChecksum)
+		}
 		return &a
 	}
-	return &execNetArtifact{*checksum, a}
+	return &execMeasuredArtifact{*checksum, hostNet, a}
 }
 
 // Kind returns the hardcoded [Kind] constant.
@@ -211,6 +259,7 @@ func (*execArtifact) Kind() Kind { return KindExec }
 
 // Params writes paths, executable pathname and args.
 func (a *execArtifact) Params(ctx *IContext) {
+	ctx.WriteString(a.arch)
 	ctx.WriteString(a.name)
 
 	ctx.WriteUint32(uint32(len(a.paths)))
@@ -257,11 +306,26 @@ func (a *execArtifact) Params(ctx *IContext) {
 	}
 }
 
+// UnsupportedArchError describes an unsupported or invalid architecture.
+type UnsupportedArchError string
+
+func (e UnsupportedArchError) Error() string {
+	if e == "" {
+		return "invalid architecture name"
+	}
+	return "unsupported architecture " + string(e)
+}
+
 // readExecArtifact interprets IR values and returns the address of execArtifact
 // or execNetArtifact.
 func readExecArtifact(r *IRReader, net bool) Artifact {
 	r.DiscardAll()
 
+	arch := r.ReadString()
+	if arch == "" {
+		panic(UnsupportedArchError(arch))
+	}
+
 	name := r.ReadString()
 
 	sz := r.ReadUint32()
@@ -312,22 +376,17 @@ func readExecArtifact(r *IRReader, net bool) Artifact {
 	exclusive := r.ReadUint32() != 0
 
 	checksum, ok := r.Finalise()
-
 	var checksumP *Checksum
-	if net {
+	if ok {
-		if !ok {
+		checksumP = new(checksum.Value())
-			panic(ErrExpectedChecksum)
+	}
-		}
+
-		checksumVal := checksum.Value()
+	if net && !ok {
-		checksumP = &checksumVal
+		panic(ErrExpectedChecksum)
-	} else {
-		if ok {
-			panic(ErrUnexpectedChecksum)
-		}
 	}
 
 	return NewExec(
-		name, checksumP, timeout, exclusive, dir, env, pathname, args, paths...,
+		name, arch, checksumP, timeout, net, exclusive, dir, env, pathname, args, paths...,
 	)
 }
 
@@ -436,11 +495,23 @@ func (a *execArtifact) makeContainer(
 	if z.HostNet {
 		z.Hostname = "cure-net"
 	}
+	z.Quiet = flags&CSuppressInit != 0
 	z.Uid, z.Gid = (1<<10)-1, (1<<10)-1
 	z.Dir, z.Path, z.Args = a.dir, a.path, a.args
 	z.Env = slices.Concat(a.env, []string{EnvJobs + "=" + strconv.Itoa(jobs)})
 	z.Grow(len(a.paths) + 4)
 
+	if a.arch != runtime.GOARCH {
+		binfmtMu.RLock()
+		e, ok := binfmt[a.arch]
+		binfmtMu.RUnlock()
+		if !ok {
+			return nil, UnsupportedArchError(a.arch)
+		}
+		z.Binfmt = []container.BinfmtEntry{e}
+		z.InitAsRoot = true
+	}
+
 	for i, b := range a.paths {
 		if i == overlayWorkIndex {
 			if err = os.MkdirAll(work.String(), 0700); err != nil {
@@ -527,9 +598,9 @@ func (c *Cache) EnterExec(
 	case *execArtifact:
 		e = f
 
-	case *execNetArtifact:
+	case *execMeasuredArtifact:
 		e = &f.execArtifact
-		hostNet = true
+		hostNet = f.hostNet
 
 	default:
 		return ErrNotExec
@@ -630,12 +701,6 @@ func (a *execArtifact) cure(f *FContext, hostNet bool) (err error) {
 			_ = stdout.Close()
 			return
 		}
-		defer func() {
-			if err != nil && !errors.As(err, new(*exec.ExitError)) {
-				_ = stdout.Close()
-				_ = stderr.Close()
-			}
-		}()
 
 		brStdout, brStderr := f.cache.getReader(stdout), f.cache.getReader(stderr)
 		stdoutDone, stderrDone := make(chan struct{}), make(chan struct{})
@@ -650,6 +715,11 @@ func (a *execArtifact) cure(f *FContext, hostNet bool) (err error) {
 			io.TeeReader(brStderr, status),
 		)
 		defer func() {
+			if err != nil && !errors.As(err, new(*exec.ExitError)) {
+				_ = stdout.Close()
+				_ = stderr.Close()
+			}
+
 			<-stdoutDone
 			<-stderrDone
 			f.cache.putReader(brStdout)

internal/pkg/exec_test.go

@@ -1,44 +1,70 @@
 package pkg_test
 
-//go:generate env CGO_ENABLED=0 go build -tags testtool -o testdata/testtool ./testdata
-
 import (
+	"bytes"
 	_ "embed"
 	"encoding/gob"
 	"errors"
+	"io/fs"
 	"net"
 	"os"
 	"os/exec"
+	"path/filepath"
 	"slices"
 	"testing"
-	"unique"
 
 	"hakurei.app/check"
+	"hakurei.app/container"
 	"hakurei.app/hst"
+	"hakurei.app/internal/info"
 	"hakurei.app/internal/pkg"
 	"hakurei.app/internal/stub"
+
+	"hakurei.app/internal/pkg/internal/testtool/expected"
 )
 
 // testtoolBin is the container test tool binary made available to the
 // execArtifact for testing its curing environment.
 //
-//go:embed testdata/testtool
+//go:generate env CGO_ENABLED=0 go build -tags testtool -o internal/testtool ./internal/testtool
+//go:embed internal/testtool/testtool
 var testtoolBin []byte
 
+func init() {
+	pathname, err := filepath.Abs("internal/testtool/testtool")
+	if err != nil {
+		panic(err)
+	}
+	pkg.RegisterArch("cafe", container.BinfmtEntry{
+		Magic:       expected.Magic,
+		Interpreter: check.MustAbs(pathname),
+	})
+}
+
 func TestExec(t *testing.T) {
 	t.Parallel()
 
-	wantChecksumOffline := pkg.MustDecode(
+	wantOffline := expectsFS{
-		"GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9",
+		".": {Mode: fs.ModeDir | 0500},
-	)
+
+		"check": {Mode: 0400, Data: []byte{0}},
+	}
+	wantOfflineEncode := pkg.Encode(wantOffline.hash())
+	failingArtifact := &stubArtifact{
+		kind:   pkg.KindTar,
+		params: []byte("doomed artifact"),
+		cure: func(t *pkg.TContext) error {
+			return stub.UniqueError(0xcafe)
+		},
+	}
 
 	checkWithCache(t, []cacheTestCase{
-		{"offline", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
+		{"offline", pkg.CValidateKnown | checkDestroySubstitutes, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			testtool, testtoolDestroy := newTesttool()
 
 			cureMany(t, c, []cureStep{
 				{"container", pkg.NewExec(
-					"exec-offline", nil, 0, false,
+					"exec-offline", "", new(wantOffline.hash()), 0, false, false,
 					pkg.AbsWork,
 					[]string{"HAKUREI_TEST=1"},
 					check.MustAbs("/opt/bin/testtool"),
@@ -58,67 +84,128 @@ func TestExec(t *testing.T) {
 						},
 					}),
 					pkg.MustPath("/opt", false, testtool),
-				), ignorePathname, wantChecksumOffline, nil},
+				), ignorePathname, wantOffline, nil},
 
-				{"error passthrough", pkg.NewExec(
+				{"substitution", pkg.NewExec(
-					"", nil, 0, true,
+					"exec-offline", "", new(wantOffline.hash()), 0, false, false,
 					pkg.AbsWork,
 					[]string{"HAKUREI_TEST=1"},
 					check.MustAbs("/opt/bin/testtool"),
 					[]string{"testtool"},
 
-					pkg.MustPath("/proc/nonexistent", false, &stubArtifact{
+					pkg.MustPath("/file", false, newStubFile(
+						pkg.KindHTTPGet,
+						pkg.ID{0xfe, 0},
+						nil,
+						nil, nil,
+					)),
+					// substitution miss fails in testtool due to differing idents
+					pkg.MustPath("/.hakurei", false, &stubArtifact{
 						kind:   pkg.KindTar,
-						params: []byte("doomed artifact"),
+						params: []byte("empty directory (substituted)"),
 						cure: func(t *pkg.TContext) error {
-							return stub.UniqueError(0xcafe)
+							return os.MkdirAll(t.GetWorkDir().String(), 0700)
 						},
 					}),
-				), nil, pkg.Checksum{}, &pkg.DependencyCureError{
+					pkg.MustPath("/opt", false, testtool),
+				), ignorePathname, wantOffline, nil},
+
+				{"error passthrough", pkg.NewExec(
+					"", "", nil, 0, false, true,
+					pkg.AbsWork,
+					[]string{"HAKUREI_TEST=1"},
+					check.MustAbs("/opt/bin/testtool"),
+					[]string{"testtool"},
+
+					pkg.MustPath("/proc/nonexistent", false, failingArtifact),
+				), nil, nil, &pkg.DependencyCureError{
 					{
-						Ident: unique.Make(pkg.ID(pkg.MustDecode(
+						A:   failingArtifact,
-							"Sowo6oZRmG6xVtUaxB6bDWZhVsqAJsIJWUp0OPKlE103cY0lodx7dem8J-qQF0Z1",
-						))),
 						Err: stub.UniqueError(0xcafe),
 					},
 				}},
 
 				{"invalid paths", pkg.NewExec(
-					"", nil, 0, false,
+					"", "", nil, 0, false, false,
 					pkg.AbsWork,
 					[]string{"HAKUREI_TEST=1"},
 					check.MustAbs("/opt/bin/testtool"),
 					[]string{"testtool"},
 
 					pkg.ExecPath{},
-				), nil, pkg.Checksum{}, pkg.ErrInvalidPaths},
+				), nil, nil, pkg.ErrInvalidPaths},
 			})
 
 			// check init failure passthrough
-			var exitError *exec.ExitError
+			initFailureArtifact := pkg.NewExec(
-			if _, _, err := c.Cure(pkg.NewExec(
+				"", "", nil, 0, false, false,
-				"", nil, 0, false,
 				pkg.AbsWork,
 				nil,
 				check.MustAbs("/opt/bin/testtool"),
 				[]string{"testtool"},
-			)); !errors.As(err, &exitError) ||
+			)
+			var exitError *exec.ExitError
+			if _, _, err := c.Cure(initFailureArtifact); !errors.As(err, &exitError) ||
 				exitError.ExitCode() != hst.ExitFailure {
 				t.Fatalf("Cure: error = %v, want init exit status 1", err)
 			}
 
-			testtoolDestroy(t, base, c)
+			var faultStatus []byte
-		}, pkg.MustDecode("Q5DluWQCAeohLoiGRImurwFp3vdz9IfQCoj7Fuhh73s4KQPRHpEQEnHTdNHmB8Fx")},
+			if faults, err := c.ReadFaults(initFailureArtifact); err != nil {
+				t.Fatal(err)
+			} else if len(faults) != 1 {
+				t.Fatalf("ReadFaults: %v", faults)
+			} else if faultStatus, err = os.ReadFile(faults[0].String()); err != nil {
+				t.Fatal(err)
+			} else if err = faults[0].Destroy(); err != nil {
+				t.Fatal(err)
+			} else {
+				t.Logf("destroyed expected fault at %s", faults[0].Time().UTC())
+			}
 
-		{"net", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
+			if !bytes.HasPrefix(faultStatus, []byte(
+				"internal/pkg ",
+			)) || !bytes.Contains(faultStatus, []byte(
+				"\ninit: fork/exec /opt/bin/testtool: no such file or directory\n",
+			)) {
+				t.Errorf("unexpected status:\n%s", string(faultStatus))
+			}
+
+			destroyStatus(t, base, 2, 1)
+			testtoolDestroy(t, base, c)
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"checksum":                                 {Mode: fs.ModeDir | 0700},
+			"checksum/" + wantOfflineEncode:            {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantOfflineEncode + "/check": {Mode: 0400, Data: []byte{0}},
+			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU": {Mode: fs.ModeDir | 0500},
+			"checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb": {Mode: 0400, Data: []byte{}},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/IY91PCtOpCYy21AaIK0c9f8-Z6fb2_2ewoHWkt4dxoLf0GOrWqS8yAGFLV84b1Dw": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantOfflineEncode)},
+			"identifier/QwS7SmiatdqryQYgESdGw7Yw2PcpNf0vNfpvUA0t92BTlKiUjfCrXyMW17G2X77X": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
+			"identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
+			"identifier/" + expected.Offline:                                              {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantOfflineEncode)},
+			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
+
+		{"net", pkg.CValidateKnown | checkDestroySubstitutes, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			testtool, testtoolDestroy := newTesttool()
 
-			wantChecksum := pkg.MustDecode(
+			wantNet := expectsFS{
-				"a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W",
+				".": {Mode: fs.ModeDir | 0500},
-			)
+
+				"check": {Mode: 0400, Data: []byte("net")},
+			}
 			cureMany(t, c, []cureStep{
 				{"container", pkg.NewExec(
-					"exec-net", &wantChecksum, 0, false,
+					"exec-net", "", new(wantNet.hash()), 0, true, false,
 					pkg.AbsWork,
 					[]string{"HAKUREI_TEST=1"},
 					check.MustAbs("/opt/bin/testtool"),
@@ -138,18 +225,37 @@ func TestExec(t *testing.T) {
 						},
 					}),
 					pkg.MustPath("/opt", false, testtool),
-				), ignorePathname, wantChecksum, nil},
+				), ignorePathname, wantNet, nil},
 			})
 
+			destroyStatus(t, base, 2, 0)
 			testtoolDestroy(t, base, c)
-		}, pkg.MustDecode("bPYvvqxpfV7xcC1EptqyKNK1klLJgYHMDkzBcoOyK6j_Aj5hb0mXNPwTwPSK5F6Z")},
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
 
-		{"overlay root", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
+			"checksum": {Mode: fs.ModeDir | 0700},
+			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},
+			"checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb":       {Mode: 0400, Data: []byte{}},
+			"checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W":       {Mode: fs.ModeDir | 0500},
+			"checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W/check": {Mode: 0400, Data: []byte("net")},
+
+			"identifier":                 {Mode: fs.ModeDir | 0700},
+			"identifier/" + expected.Net: {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W")},
+			"identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
+			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
+
+		{"overlay root", pkg.CValidateKnown | checkDestroySubstitutes, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			testtool, testtoolDestroy := newTesttool()
 
 			cureMany(t, c, []cureStep{
 				{"container", pkg.NewExec(
-					"exec-overlay-root", nil, 0, false,
+					"exec-overlay-root", "", nil, 0, false, false,
 					pkg.AbsWork,
 					[]string{"HAKUREI_TEST=1", "HAKUREI_ROOT=1"},
 					check.MustAbs("/opt/bin/testtool"),
@@ -163,18 +269,35 @@ func TestExec(t *testing.T) {
 						},
 					}),
 					pkg.MustPath("/opt", false, testtool),
-				), ignorePathname, wantChecksumOffline, nil},
+				), ignorePathname, wantOffline, nil},
 			})
 
+			destroyStatus(t, base, 2, 0)
 			testtoolDestroy(t, base, c)
-		}, pkg.MustDecode("PO2DSSCa4yoSgEYRcCSZfQfwow1yRigL3Ry-hI0RDI4aGuFBha-EfXeSJnG_5_Rl")},
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
 
-		{"overlay work", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
+			"checksum":                                 {Mode: fs.ModeDir | 0700},
+			"checksum/" + wantOfflineEncode:            {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantOfflineEncode + "/check": {Mode: 0400, Data: []byte{0}},
+			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU": {Mode: fs.ModeDir | 0500},
+
+			"identifier":                     {Mode: fs.ModeDir | 0700},
+			"identifier/" + expected.OvlRoot: {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantOfflineEncode)},
+			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
+
+		{"overlay work", pkg.CValidateKnown | checkDestroySubstitutes, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			testtool, testtoolDestroy := newTesttool()
 
 			cureMany(t, c, []cureStep{
 				{"container", pkg.NewExec(
-					"exec-overlay-work", nil, 0, false,
+					"exec-overlay-work", "", nil, 0, false, false,
 					pkg.AbsWork,
 					[]string{"HAKUREI_TEST=1", "HAKUREI_ROOT=1"},
 					check.MustAbs("/work/bin/testtool"),
@@ -193,18 +316,35 @@ func TestExec(t *testing.T) {
 							return os.MkdirAll(t.GetWorkDir().String(), 0700)
 						},
 					}), pkg.Path(pkg.AbsWork, false /* ignored */, testtool),
-				), ignorePathname, wantChecksumOffline, nil},
+				), ignorePathname, wantOffline, nil},
 			})
 
+			destroyStatus(t, base, 2, 0)
 			testtoolDestroy(t, base, c)
-		}, pkg.MustDecode("iaRt6l_Wm2n-h5UsDewZxQkCmjZjyL8r7wv32QT2kyV55-Lx09Dq4gfg9BiwPnKs")},
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
 
-		{"multiple layers", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
+			"checksum":                                 {Mode: fs.ModeDir | 0700},
+			"checksum/" + wantOfflineEncode:            {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantOfflineEncode + "/check": {Mode: 0400, Data: []byte{0}},
+			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU": {Mode: fs.ModeDir | 0500},
+
+			"identifier":                  {Mode: fs.ModeDir | 0700},
+			"identifier/" + expected.Work: {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantOfflineEncode)},
+			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
+
+		{"multiple layers", pkg.CValidateKnown | checkDestroySubstitutes, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			testtool, testtoolDestroy := newTesttool()
 
 			cureMany(t, c, []cureStep{
 				{"container", pkg.NewExec(
-					"exec-multiple-layers", nil, 0, false,
+					"exec-multiple-layers", "", nil, 0, false, false,
 					pkg.AbsWork,
 					[]string{"HAKUREI_TEST=1", "HAKUREI_ROOT=1"},
 					check.MustAbs("/opt/bin/testtool"),
@@ -245,18 +385,40 @@ func TestExec(t *testing.T) {
 						},
 					}),
 					pkg.MustPath("/opt", false, testtool),
-				), ignorePathname, wantChecksumOffline, nil},
+				), ignorePathname, wantOffline, nil},
 			})
 
+			destroyStatus(t, base, 2, 0)
 			testtoolDestroy(t, base, c)
-		}, pkg.MustDecode("O2YzyR7IUGU5J2CADy0hUZ3A5NkP_Vwzs4UadEdn2oMZZVWRtH0xZGJ3HXiimTnZ")},
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
 
-		{"overlay layer promotion", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
+			"checksum":                                 {Mode: fs.ModeDir | 0700},
+			"checksum/" + wantOfflineEncode:            {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantOfflineEncode + "/check": {Mode: 0400, Data: []byte{0}},
+			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},
+			"checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb":       {Mode: 0400, Data: []byte{}},
+			"checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK":       {Mode: fs.ModeDir | 0500},
+			"checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK/check": {Mode: 0400, Data: []byte("layers")},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
+			"identifier/B-kc5iJMx8GtlCua4dz6BiJHnDAOUfPjgpbKq4e-QEn0_CZkSYs3fOA1ve06qMs2": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK")},
+			"identifier/" + expected.Layers:                                               {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantOfflineEncode)},
+			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
+
+		{"overlay layer promotion", pkg.CValidateKnown | checkDestroySubstitutes, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			testtool, testtoolDestroy := newTesttool()
 
 			cureMany(t, c, []cureStep{
 				{"container", pkg.NewExec(
-					"exec-layer-promotion", nil, 0, true,
+					"exec-layer-promotion", "", nil, 0, false, true,
 					pkg.AbsWork,
 					[]string{"HAKUREI_TEST=1", "HAKUREI_ROOT=1"},
 					check.MustAbs("/opt/bin/testtool"),
@@ -276,11 +438,96 @@ func TestExec(t *testing.T) {
 						},
 					}),
 					pkg.MustPath("/opt", false, testtool),
-				), ignorePathname, wantChecksumOffline, nil},
+				), ignorePathname, wantOffline, nil},
 			})
 
+			destroyStatus(t, base, 2, 0)
 			testtoolDestroy(t, base, c)
-		}, pkg.MustDecode("3EaW6WibLi9gl03_UieiFPaFcPy5p4x3JPxrnLJxGaTI-bh3HU9DK9IMx7c3rrNm")},
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"checksum":                                 {Mode: fs.ModeDir | 0700},
+			"checksum/" + wantOfflineEncode:            {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantOfflineEncode + "/check": {Mode: 0400, Data: []byte{0}},
+			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU": {Mode: fs.ModeDir | 0500},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/kvJIqZo5DKFOxC2ZQ-8_nPaQzEAz9cIm3p6guO-uLqm-xaiPu7oRkSnsu411jd_U": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
+			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
+			"identifier/" + expected.Promote:                                              {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantOfflineEncode)},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
+
+		{"binfmt", pkg.CValidateKnown | checkDestroySubstitutes, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
+			if info.CanDegrade && os.Getenv("ROSA_SKIP_BINFMT") != "" {
+				t.Skip("binfmt_misc test explicitly skipped")
+			}
+
+			cureMany(t, c, []cureStep{
+				{"container", pkg.NewExec(
+					"exec-binfmt", "cafe", nil, 0, false, true,
+					pkg.AbsWork,
+					[]string{"HAKUREI_TEST=1", "HAKUREI_BINFMT=1"},
+					check.MustAbs("/opt/bin/sample"),
+					[]string{"sample"},
+
+					pkg.MustPath("/", true, &stubArtifact{
+						kind:   pkg.KindTar,
+						params: []byte("empty directory"),
+						cure: func(t *pkg.TContext) error {
+							return os.MkdirAll(t.GetWorkDir().String(), 0700)
+						},
+					}),
+					pkg.MustPath("/opt", false, overrideIdent{pkg.ID{0xfe, 0xff}, &stubArtifact{
+						kind: pkg.KindTar,
+						cure: func(t *pkg.TContext) error {
+							work := t.GetWorkDir()
+							if err := os.MkdirAll(
+								work.Append("bin").String(),
+								0700,
+							); err != nil {
+								return err
+							}
+
+							return os.WriteFile(t.GetWorkDir().Append(
+								"bin",
+								"sample",
+							).String(), []byte(expected.Full), 0500)
+						},
+					}}),
+				), ignorePathname, expectsFS{
+					".": {Mode: fs.ModeDir | 0500},
+
+					"check": {Mode: 0400, Data: []byte("binfmt")},
+				}, nil},
+			})
+
+			destroyStatus(t, base, 2, 0)
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"checksum": {Mode: fs.ModeDir | 0700},
+			"checksum/5aevg3YpDxjqQZ-pdvXK7YqgkL5JKqcoStYQxeD96kuYar6K2mRQWMHib6NQRnpV":            {Mode: fs.ModeDir | 0500},
+			"checksum/5aevg3YpDxjqQZ-pdvXK7YqgkL5JKqcoStYQxeD96kuYar6K2mRQWMHib6NQRnpV/bin":        {Mode: fs.ModeDir | 0700},
+			"checksum/5aevg3YpDxjqQZ-pdvXK7YqgkL5JKqcoStYQxeD96kuYar6K2mRQWMHib6NQRnpV/bin/sample": {Mode: 0500, Data: []byte("\xca\xfe\xba\xbe\xfd\xfd:3")},
+			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":            {Mode: fs.ModeDir | 0500},
+			"checksum/UnDo4B5KneEUY5b4vRUk_y9MWgkWuw2N8f8a2XayO686xXur-aZmX2-7n_8tKMe3":            {Mode: fs.ModeDir | 0500},
+			"checksum/UnDo4B5KneEUY5b4vRUk_y9MWgkWuw2N8f8a2XayO686xXur-aZmX2-7n_8tKMe3/check":      {Mode: 0400, Data: []byte("binfmt")},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/6VQTJ1lI5BmVuI1YFYJ8ClO3MRORvTTrcWFDcUU-l5Ga8EofxCxGlSTYN-u8dKj_": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/UnDo4B5KneEUY5b4vRUk_y9MWgkWuw2N8f8a2XayO686xXur-aZmX2-7n_8tKMe3")},
+			"identifier/_v8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/5aevg3YpDxjqQZ-pdvXK7YqgkL5JKqcoStYQxeD96kuYar6K2mRQWMHib6NQRnpV")},
+			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 	})
 }
 

internal/pkg/file_test.go

@@ -1,6 +1,7 @@
 package pkg_test
 
 import (
+	"io/fs"
 	"testing"
 
 	"hakurei.app/check"
@@ -10,18 +11,27 @@ import (
 func TestFile(t *testing.T) {
 	t.Parallel()
 
+	want := expectsFile{0}
 	checkWithCache(t, []cacheTestCase{
 		{"file", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			cureMany(t, c, []cureStep{
 				{"short", pkg.NewFile("null", []byte{0}), base.Append(
 					"identifier",
 					"3376ALA7hIUm2LbzH2fDvRezgzod1eTK_G6XjyOgbM2u-6swvkFaF0BOwSl_juBi",
-				), pkg.MustDecode(
+				), want, nil},
-					"vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX",
-				), nil},
 			})
-		}, pkg.MustDecode(
+		}, expectsFS{
-			"iR6H5OIsyOW4EwEgtm9rGzGF6DVtyHLySEtwnFE8bnus9VJcoCbR4JIek7Lw-vwT",
+			".": {Mode: fs.ModeDir | 0700},
-		)},
+
+			"checksum":                            {Mode: fs.ModeDir | 0700},
+			"checksum/" + pkg.Encode(want.hash()): {Mode: 0400, Data: []byte{0}},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/3376ALA7hIUm2LbzH2fDvRezgzod1eTK_G6XjyOgbM2u-6swvkFaF0BOwSl_juBi": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX")},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 	})
 }

internal/pkg/internal/testtool/expected/expected.go

@@ -0,0 +1,9 @@
+// Package expected contains data shared between test helper and test harness.
+package expected
+
+const (
+	// Magic are magic bytes in the binfmt test case.
+	Magic = "\xca\xfe\xba\xbe\xfd\xfd"
+	// Full is the full content of the binfmt test case executable.
+	Full = Magic + ":3"
+)

internal/pkg/internal/testtool/expected/sum_amd64.go

@@ -0,0 +1,10 @@
+package expected
+
+const (
+	Offline = "q5ktDTq0miP-VvB2blxqXQeaRXCUWgP_KbC18KNtUDtyoaI_h5mHmGuPMArVEBDs"
+	OvlRoot = "NacZGXwuRkTvcHaG08a22ujJ8qCWN0RSoFlRSR5FSt0ZcBbJ28FRvkYsHEtX7G8i"
+	Layers  = "WBJDrATtX6rIE5yAu8ePX3WmDF0Tt9kFiue0m3cRnyRoVx1my8a67fh3CAW486oP"
+	Net     = "CmYtj2sNB3LHtqiDuck_Lz3MjLLIiwyP8N4NDitQ1Icvv__LVP9p8tm-sHeQaKKp"
+	Promote = "TX3eCloaQFkV-SZIH6Jg6E5WKH--rcXY1P0jnZKmLFKWrNqnOzd4G9eIBh6i5ywN"
+	Work    = "OuNiLSC68pZhAOr1YQ4WbV1tzASA0nxLEBcK7lO7MqxDY_j8dmP_C612RTuF23Lu"
+)

internal/pkg/internal/testtool/expected/sum_arm64.go

@@ -0,0 +1,10 @@
+package expected
+
+const (
+	Offline = "WapqyoPxbWSnq07dWHt71mHaJXq99pAjJfFlELlJljSiZMhTFqqlzU1_mN86shSj"
+	OvlRoot = "V9anFOiRvjGfAeBhLl14AL8TKdWZyD0WTPYe4fS9mOBw8iW5Lmarvt6TG6MV8uWm"
+	Layers  = "tKx7JNRoSBdK_7MdzI-nwTNV2wmiPzwYdcd17oLmXKL_iLmUzUiA79qTqdrTasrv"
+	Net     = "aXyDLzBCJ9XltXZIfetEVsEkrqHfcXuD5XE_FcUnYbN3emwL55N6P8LlHzNfGnM5"
+	Promote = "3k4V16n96Lq04gjFSKmm4sFjyQ883FFBNXgTy9s_DjeTwxT3pg_iacEh8yMb_S4m"
+	Work    = "6Q49MhFWRE3Ne6MycwAotgl1GtoU5WCHqJNWG2byYZCY-zX-IxPrWiKk7bKkNzhE"
+)

internal/pkg/internal/testtool/expected/sum_riscv64.go

@@ -0,0 +1,10 @@
+package expected
+
+const (
+	Offline = "Z6yXE5gOJScL3srmnVMWgCXccDiUNZ5snSrf6RkXuU1_U0rX_kGVwsfHUgNG_awd"
+	OvlRoot = "zYXJHFRLuxvUhuisZEXgGgVvdQd6piMfp5jmtT6jdVjvC2gICXquOq-UTwlrSD5I"
+	Layers  = "_F8EDazHbcLeT0sVSQXRN_kn9IjduqJcDYgzXpsT-hpKU4EBcZ0PISN2zchpqMbm"
+	Net     = "CA_FAaSIYJgapBEHV40doxpH23PdUEy_6s1TZc7wfSPN0XYqwGpMceXXDSabGveO"
+	Promote = "_3LPrLp--4h9k4GsNNApu9hHtAafq-GUhfU6d4hJKBDKT3bz_szOsvkXxc5sK53d"
+	Work    = "FEgHeiCD_WT4wsfB-9kDH5n6cRWCEYtJmXdKZgmUUukAOoXumH_hLlosXREC-tqq"
+)

internal/pkg/internal/testtool/main.go

@@ -16,12 +16,27 @@ import (
 
 	"hakurei.app/fhs"
 	"hakurei.app/vfs"
+
+	"hakurei.app/internal/pkg/internal/testtool/expected"
 )
 
 func main() {
 	log.SetFlags(0)
 	log.SetPrefix("testtool: ")
 
+	if os.Getenv("HAKUREI_BINFMT") == "1" {
+		wantArgs := []string{"/interpreter", "/opt/bin/sample"}
+		if !slices.Equal(os.Args, wantArgs) {
+			log.Fatalf("Args: %q, want %q", os.Args, wantArgs)
+		}
+
+		if err := os.WriteFile("check", []byte("binfmt"), 0400); err != nil {
+			log.Fatal(err)
+		}
+
+		return
+	}
+
 	environ := slices.DeleteFunc(slices.Clone(os.Environ()), func(s string) bool {
 		return s == "CURE_JOBS="+strconv.Itoa(runtime.NumCPU())
 	})
@@ -147,12 +162,12 @@ func main() {
 	}
 
 	const checksumEmptyDir = "MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"
-	ident := "dztPS6jRjiZtCF4_p8AzfnxGp6obkhrgFVsxdodbKWUoAEVtDz3MykepJB4kI_ks"
+	ident := expected.Offline
 	log.Println(m)
 	next := func() { m = m.Next; log.Println(m) }
 
 	if overlayRoot {
-		ident = "RdMA-mubnrHuu3Ky1wWyxauSYCO0ZH_zCPUj3uDHqkfwv5sGcByoF_g5PjlGiClb"
+		ident = expected.OvlRoot
 
 		if m.Root != "/" || m.Target != "/" ||
 			m.Source != "overlay" || m.FsType != "overlay" {
@@ -170,7 +185,7 @@ func main() {
 				log.Fatal("unexpected artifact checksum")
 			}
 		} else {
-			ident = "p1t_drXr34i-jZNuxDMLaMOdL6tZvQqhavNafGynGqxOZoXAUTSn7kqNh3Ovv3DT"
+			ident = expected.Layers
 
 			if len(lowerdir) != 2 ||
 				filepath.Base(lowerdir[0]) != "MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU" ||
@@ -180,7 +195,7 @@ func main() {
 		}
 	} else {
 		if hostNet {
-			ident = "G8qPxD9puvvoOVV7lrT80eyDeIl3G_CCFoKw12c8mCjMdG1zF7NEPkwYpNubClK3"
+			ident = expected.Net
 		}
 
 		if m.Root != "/sysroot" || m.Target != "/" {
@@ -199,14 +214,14 @@ func main() {
 	}
 
 	if promote {
-		ident = "xXTIYcXmgJWNLC91c417RRrNM9cjELwEZHpGvf8Fk_GNP5agRJp_SicD0w9aMeLJ"
+		ident = expected.Promote
 	}
 
 	next() // testtool artifact
 
 	next()
 	if overlayWork {
-		ident = "5hlaukCirnXE4W_RSLJFOZN47Z5RiHnacXzdFp_70cLgiJUGR6cSb_HaFftkzi0-"
+		ident = expected.Work
 		if m.Root != "/" || m.Target != "/work" ||
 			m.Source != "overlay" || m.FsType != "overlay" {
 			log.Fatal("unexpected work mount entry")

internal/pkg/ir.go

@@ -76,6 +76,9 @@ type IContext struct {
 	// Written to by various methods, should be zeroed after [Artifact.Params]
 	// returns and must not be exposed directly.
 	w io.Writer
+	// Optional [Artifact] to cureRes cache, replaces [IRKindIdent] with
+	// checksum values if non-nil.
+	inputs map[Artifact]cureRes
 }
 
 // irZero is a zero IR word.
@@ -163,7 +166,15 @@ func (i *IContext) WriteIdent(a Artifact) {
 	defer i.ic.putIdentBuf(buf)
 
 	IRKindIdent.encodeHeader(0).put(buf[:])
-	*(*ID)(buf[wordSize:]) = i.ic.Ident(a).Value()
+	if i.inputs != nil {
+		res, ok := i.inputs[a]
+		if !ok {
+			panic(InvalidLookupError(i.ic.Ident(a).Value()))
+		}
+		*(*ID)(buf[wordSize:]) = res.checksum.Value()
+	} else {
+		*(*ID)(buf[wordSize:]) = i.ic.Ident(a).Value()
+	}
 	i.mustWrite(buf[:])
 }
 
@@ -207,19 +218,44 @@ func (i *IContext) WriteString(s string) {
 // Encode writes a deterministic, efficient representation of a to w and returns
 // the first non-nil error encountered while writing to w.
 func (ic *irCache) Encode(w io.Writer, a Artifact) (err error) {
+	return ic.encode(w, a, nil)
+}
+
+// encode implements Encode but replaces identifiers with their cured checksums
+// for a non-nil ident. Caller must acquire Cache.identMu.
+func (ic *irCache) encode(
+	w io.Writer,
+	a Artifact,
+	inputs map[Artifact]cureRes,
+) (err error) {
 	deps := a.Dependencies()
 	idents := make([]*extIdent, len(deps))
-	for i, d := range deps {
+	if inputs == nil {
-		dbuf, did := ic.unsafeIdent(d, true)
+		for i, d := range deps {
-		if dbuf == nil {
+			dbuf, did := ic.unsafeIdent(d, true)
-			dbuf = ic.getIdentBuf()
+			if dbuf == nil {
+				dbuf = ic.getIdentBuf()
+				binary.LittleEndian.PutUint64(dbuf[:], uint64(d.Kind()))
+				*(*ID)(dbuf[wordSize:]) = did.Value()
+			} else {
+				ic.storeIdent(d, dbuf)
+			}
+			defer ic.putIdentBuf(dbuf)
+			idents[i] = dbuf
+		}
+	} else {
+		for i, d := range deps {
+			res, ok := inputs[d]
+			if !ok {
+				return InvalidLookupError(ic.Ident(d).Value())
+			}
+
+			dbuf := ic.getIdentBuf()
 			binary.LittleEndian.PutUint64(dbuf[:], uint64(d.Kind()))
-			*(*ID)(dbuf[wordSize:]) = did.Value()
+			*(*ID)(dbuf[wordSize:]) = res.checksum.Value()
-		} else {
+			defer ic.putIdentBuf(dbuf)
-			ic.storeIdent(d, dbuf)
+			idents[i] = dbuf
 		}
-		defer ic.putIdentBuf(dbuf)
-		idents[i] = dbuf
 	}
 	slices.SortFunc(idents, func(a, b *extIdent) int {
 		return bytes.Compare(a[:], b[:])
@@ -244,7 +280,7 @@ func (ic *irCache) Encode(w io.Writer, a Artifact) (err error) {
 	}
 
 	func() {
-		i := IContext{ic, w}
+		i := IContext{ic, w, inputs}
 
 		defer panicToError(&err)
 		defer func() { i.ic, i.w = nil, nil }()

internal/pkg/ir_test.go

@@ -3,6 +3,7 @@ package pkg_test
 import (
 	"bytes"
 	"io"
+	"io/fs"
 	"reflect"
 	"testing"
 
@@ -38,7 +39,7 @@ func TestIRRoundtrip(t *testing.T) {
 		)},
 
 		{"exec offline", pkg.NewExec(
-			"exec-offline", nil, 0, false,
+			"exec-offline", "", nil, 0, false, false,
 			pkg.AbsWork,
 			[]string{"HAKUREI_TEST=1"},
 			check.MustAbs("/opt/bin/testtool"),
@@ -58,9 +59,9 @@ func TestIRRoundtrip(t *testing.T) {
 		)},
 
 		{"exec net", pkg.NewExec(
-			"exec-net",
+			"exec-net", "",
 			(*pkg.Checksum)(bytes.Repeat([]byte{0xfc}, len(pkg.Checksum{}))),
-			0, false,
+			0, false, false,
 			pkg.AbsWork,
 			[]string{"HAKUREI_TEST=1"},
 			check.MustAbs("/opt/bin/testtool"),
@@ -79,6 +80,28 @@ func TestIRRoundtrip(t *testing.T) {
 			)),
 		)},
 
+		{"exec measured", pkg.NewExec(
+			"exec-measured", "",
+			(*pkg.Checksum)(bytes.Repeat([]byte{0xfd}, len(pkg.Checksum{}))),
+			0, false, false,
+			pkg.AbsWork,
+			[]string{"HAKUREI_TEST=1"},
+			check.MustAbs("/opt/bin/testtool"),
+			[]string{"testtool", "measured"},
+
+			pkg.MustPath("/file", false, pkg.NewFile("file", []byte(
+				"stub file",
+			))), pkg.MustPath("/.hakurei", false, pkg.NewHTTPGetTar(
+				nil, "file:///hakurei.tar",
+				pkg.Checksum(bytes.Repeat([]byte{0xfd}, len(pkg.Checksum{}))),
+				pkg.TarUncompressed,
+			)), pkg.MustPath("/opt", false, pkg.NewHTTPGetTar(
+				nil, "file:///testtool.tar.gz",
+				pkg.Checksum(bytes.Repeat([]byte{0xfd}, len(pkg.Checksum{}))),
+				pkg.TarGzip,
+			)),
+		)},
+
 		{"file anonymous", pkg.NewFile("", []byte{0})},
 		{"file", pkg.NewFile("stub", []byte("stub"))},
 	}
@@ -105,9 +128,13 @@ func TestIRRoundtrip(t *testing.T) {
 				if err := <-done; err != nil {
 					t.Fatalf("EncodeAll: error = %v", err)
 				}
-			}, pkg.MustDecode(
+			}, expectsFS{
-				"E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C",
+				".":          {Mode: fs.ModeDir | 0700},
-			),
+				"checksum":   {Mode: fs.ModeDir | 0700},
+				"identifier": {Mode: fs.ModeDir | 0700},
+				"substitute": {Mode: fs.ModeDir | 0700},
+				"work":       {Mode: fs.ModeDir | 0700},
+			},
 		}
 	}
 	checkWithCache(t, testCasesCache)

internal/pkg/net_test.go

@@ -3,6 +3,7 @@ package pkg_test
 import (
 	"crypto/sha512"
 	"io"
+	"io/fs"
 	"net/http"
 	"reflect"
 	"testing"
@@ -85,7 +86,13 @@ func TestHTTPGet(t *testing.T) {
 			if _, err := f.Cure(r); !reflect.DeepEqual(err, wantErrNotFound) {
 				t.Fatalf("Cure: error = %#v, want %#v", err, wantErrNotFound)
 			}
-		}, pkg.MustDecode("E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C")},
+		}, expectsFS{
+			".":          {Mode: fs.ModeDir | 0700},
+			"checksum":   {Mode: fs.ModeDir | 0700},
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"substitute": {Mode: fs.ModeDir | 0700},
+			"work":       {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"cure", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			r := newRContext(t, c)
@@ -144,6 +151,18 @@ func TestHTTPGet(t *testing.T) {
 			if _, _, err := c.Cure(f); !reflect.DeepEqual(err, wantErrNotFound) {
 				t.Fatalf("Pathname: error = %#v, want %#v", err, wantErrNotFound)
 			}
-		}, pkg.MustDecode("L_0RFHpr9JUS4Zp14rz2dESSRvfLzpvqsLhR1-YjQt8hYlmEdVl7vI3_-v8UNPKs")},
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"checksum": {Mode: fs.ModeDir | 0700},
+			"checksum/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU": {Mode: 0400, Data: []byte("\x7f\xe1\x69\xa2\xdd\x63\x96\x26\x83\x79\x61\x8b\xf0\x3f\xd5\x16\x9a\x39\x3a\xdb\xcf\xb1\xbc\x8d\x33\xff\x75\xee\x62\x56\xa9\xf0\x27\xac\x13\x94\x69")},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/oM-2pUlk-mOxK1t3aMWZer69UdOQlAXiAgMrpZ1476VoOqpYVP1aGFS9_HYy-D8_": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU")},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 	})
 }

internal/pkg/pkg.go

@@ -4,6 +4,7 @@ package pkg
 import (
 	"bufio"
 	"bytes"
+	"cmp"
 	"context"
 	"crypto/sha512"
 	"encoding/base64"
@@ -15,6 +16,7 @@ import (
 	"io/fs"
 	"maps"
 	"os"
+	"os/signal"
 	"path/filepath"
 	"runtime"
 	"slices"
@@ -24,6 +26,7 @@ import (
 	"sync/atomic"
 	"syscall"
 	"testing"
+	"time"
 	"unique"
 	"unsafe"
 
@@ -247,7 +250,14 @@ func (t *TContext) destroy(errP *error) {
 			*errP = errors.Join(*errP, err)
 		}
 		if *errP != nil {
-			*errP = errors.Join(*errP, os.Remove(t.statusPath.String()))
+			*errP = errors.Join(*errP, os.Rename(
+				t.statusPath.String(), t.cache.base.Append(
+					dirFault,
+					t.ids+"."+strconv.FormatUint(uint64(
+						time.Now().UnixNano(),
+					), 10),
+				).String(),
+			))
 		}
 		t.status = nil
 	}
@@ -508,33 +518,34 @@ const (
 )
 
 const (
-	// fileLock is the file name appended to Cache.base for guaranteeing
+	// fileLock is the lock file for exclusive access to the cache directory.
-	// exclusive access to the cache directory.
 	fileLock = "lock"
-	// fileVariant is the file name appended to Cache.base holding the variant
+	// fileVariant is a file holding the variant identification string set by a
-	// identification string set by a prior call to [SetExtension].
+	// prior call to [SetExtension].
 	fileVariant = "variant"
 
-	// dirIdentifier is the directory name appended to Cache.base for storing
+	// dirSubstitute holds symlinks to artifacts by checksum, named after their
-	// artifacts named after their [ID].
+	// substitute identifier.
+	dirSubstitute = "substitute"
+	// dirIdentifier holds symlinks to artifacts by checksum,  named after their
+	// IR-based identifier.
 	dirIdentifier = "identifier"
-	// dirChecksum is the directory name appended to Cache.base for storing
+	// dirChecksum holds artifacts named after their [Checksum].
-	// artifacts named after their [Checksum].
 	dirChecksum = "checksum"
-	// dirStatus is the directory name appended to Cache.base for storing
+	// dirStatus holds artifact metadata and logs named after their IR-based
-	// artifact metadata and logs named after their [ID].
+	// identifier. For [FloodArtifact], the same file is also available under
+	// its substitute identifier.
 	dirStatus = "status"
+	// dirFault holds status files of faulted cures.
+	dirFault = "fault"
 
-	// dirWork is the directory name appended to Cache.base for working
+	// dirWork holds working pathnames set up during [Cache.Cure].
-	// pathnames set up during [Cache.Cure].
 	dirWork = "work"
-	// dirTemp is the directory name appended to Cache.base for scratch space
+	// dirTemp holds scratch space allocated during [Cache.Cure].
-	// pathnames allocated during [Cache.Cure].
 	dirTemp = "temp"
 
-	// dirExecScratch is the directory name appended to Cache.base for scratch
+	// dirExecScratch is scratch space set up for the container started by
-	// space setting up the container started by [Cache.EnterExec]. Exclusivity
+	// [Cache.EnterExec]. Exclusivity via Cache.inExec.
-	// via Cache.inExec.
 	dirExecScratch = "scratch"
 
 	// checksumLinknamePrefix is prepended to the encoded [Checksum] value
@@ -617,6 +628,13 @@ const (
 	// CPromoteVariant allows [pkg.Open] to promote an unextended on-disk cache
 	// to the current extension variant. This is a one-way operation.
 	CPromoteVariant
+
+	// CSuppressInit arranges for verbose output of the container init to be
+	// suppressed regardless of [message.Msg] state.
+	CSuppressInit
+
+	// CIgnoreSubstitutes disables content-based dependency substitution.
+	CIgnoreSubstitutes
 )
 
 // toplevel holds [context.WithCancel] over caller-supplied context, where all
@@ -672,6 +690,11 @@ type Cache struct {
 	// Synchronises access to dirChecksum.
 	checksumMu sync.RWMutex
 
+	// Presence of an alternative in the cache. Keys are not valid identifiers
+	// and must not be used as such.
+	substitute map[unique.Handle[ID]]unique.Handle[Checksum]
+	// Synchronises access to substitute and corresponding filesystem entries.
+	substituteMu sync.RWMutex
 	// Identifier to content pair cache.
 	ident map[unique.Handle[ID]]unique.Handle[Checksum]
 	// Identifier to error pair for unrecoverably faulted [Artifact].
@@ -882,11 +905,14 @@ func (c *Cache) Scrub(checks int) error {
 		checks = runtime.NumCPU()
 	}
 
+	c.substituteMu.Lock()
+	defer c.substituteMu.Unlock()
 	c.identMu.Lock()
 	defer c.identMu.Unlock()
 	c.checksumMu.Lock()
 	defer c.checksumMu.Unlock()
 
+	c.substitute = make(map[unique.Handle[ID]]unique.Handle[Checksum])
 	c.ident = make(map[unique.Handle[ID]]unique.Handle[Checksum])
 	c.identErr = make(map[unique.Handle[ID]]error)
 	c.artifact.Clear()
@@ -994,47 +1020,52 @@ func (c *Cache) Scrub(checks int) error {
 		wg.Wait()
 	}
 
-	dir = c.base.Append(dirIdentifier)
+	for _, suffix := range []string{
-	if entries, readdirErr := os.ReadDir(dir.String()); readdirErr != nil {
+		dirSubstitute,
-		addErr(dir, readdirErr)
+		dirIdentifier,
-	} else {
+	} {
-		wg.Add(len(entries))
+		dir = c.base.Append(suffix)
-		for _, ent := range entries {
+		if entries, readdirErr := os.ReadDir(dir.String()); readdirErr != nil {
-			w <- checkEntry{ent, func(ent os.DirEntry, want *Checksum) bool {
+			addErr(dir, readdirErr)
-				got := p.Get().(*Checksum)
+		} else {
-				defer p.Put(got)
+			wg.Add(len(entries))
+			for _, ent := range entries {
+				w <- checkEntry{ent, func(ent os.DirEntry, want *Checksum) bool {
+					got := p.Get().(*Checksum)
+					defer p.Put(got)
 
-				pathname := dir.Append(ent.Name())
+					pathname := dir.Append(ent.Name())
-				if linkname, err := os.Readlink(
+					if linkname, err := os.Readlink(
-					pathname.String(),
+						pathname.String(),
-				); err != nil {
+					); err != nil {
-					seMu.Lock()
+						seMu.Lock()
-					se.Errs[pathname.Handle()] = append(se.Errs[pathname.Handle()], err)
+						se.Errs[pathname.Handle()] = append(se.Errs[pathname.Handle()], err)
-					se.DanglingIdentifiers = append(se.DanglingIdentifiers, *want)
+						se.DanglingIdentifiers = append(se.DanglingIdentifiers, *want)
-					seMu.Unlock()
+						seMu.Unlock()
-					return false
+						return false
-				} else if err = Decode(got, filepath.Base(linkname)); err != nil {
+					} else if err = Decode(got, filepath.Base(linkname)); err != nil {
-					seMu.Lock()
+						seMu.Lock()
-					lnp := dir.Append(linkname)
+						lnp := dir.Append(linkname)
-					se.Errs[lnp.Handle()] = append(se.Errs[lnp.Handle()], err)
+						se.Errs[lnp.Handle()] = append(se.Errs[lnp.Handle()], err)
-					se.DanglingIdentifiers = append(se.DanglingIdentifiers, *want)
+						se.DanglingIdentifiers = append(se.DanglingIdentifiers, *want)
-					seMu.Unlock()
+						seMu.Unlock()
-					return false
+						return false
-				}
-
-				if _, err := os.Stat(pathname.String()); err != nil {
-					if !errors.Is(err, os.ErrNotExist) {
-						addErr(pathname, err)
 					}
-					seMu.Lock()
+
-					se.DanglingIdentifiers = append(se.DanglingIdentifiers, *want)
+					if _, err := os.Stat(pathname.String()); err != nil {
-					seMu.Unlock()
+						if !errors.Is(err, os.ErrNotExist) {
-					return false
+							addErr(pathname, err)
-				}
+						}
-				return true
+						seMu.Lock()
-			}}
+						se.DanglingIdentifiers = append(se.DanglingIdentifiers, *want)
+						seMu.Unlock()
+						return false
+					}
+					return true
+				}}
+			}
+			wg.Wait()
 		}
-		wg.Wait()
 	}
 
 	dir = c.base.Append(dirStatus)
@@ -1182,6 +1213,52 @@ func (c *Cache) finaliseIdent(
 	close(done)
 }
 
+// zeroChecksum is a zero [Checksum] handle, used for comparison only.
+var zeroChecksum unique.Handle[Checksum]
+
+// loadSubstitute returns a checksum corresponding to a substitute identifier,
+// or zeroChecksum if an alternative is not available.
+func (c *Cache) loadSubstitute(
+	substitute unique.Handle[ID],
+) (unique.Handle[Checksum], error) {
+	c.substituteMu.RLock()
+	if checksum, ok := c.substitute[substitute]; ok {
+		c.substituteMu.RUnlock()
+		return checksum, nil
+	}
+
+	linkname, err := os.Readlink(c.base.Append(
+		dirSubstitute,
+		Encode(substitute.Value()),
+	).String())
+	c.substituteMu.RUnlock()
+
+	if err != nil {
+		if !errors.Is(err, os.ErrNotExist) {
+			return zeroChecksum, err
+		}
+
+		c.substituteMu.Lock()
+		c.substitute[substitute] = zeroChecksum
+		c.substituteMu.Unlock()
+		return zeroChecksum, nil
+	}
+
+	var checksum unique.Handle[Checksum]
+	buf := c.getIdentBuf()
+	err = Decode((*Checksum)(buf[:]), filepath.Base(linkname))
+	if err == nil {
+		checksum = unique.Make(Checksum(buf[:]))
+
+		c.substituteMu.Lock()
+		c.substitute[substitute] = checksum
+		c.substituteMu.Unlock()
+	}
+	c.putIdentBuf(buf)
+
+	return checksum, err
+}
+
 // Done returns a channel that is closed when the ongoing cure of an [Artifact]
 // referred to by the specified identifier completes. Done may return nil if
 // no ongoing cure of the specified identifier exists.
@@ -1416,8 +1493,8 @@ func (c *Cache) Cure(a Artifact) (
 
 // CureError wraps a non-nil error returned attempting to cure an [Artifact].
 type CureError struct {
-	Ident unique.Handle[ID]
+	A   Artifact
-	Err   error
+	Err error
 }
 
 // Unwrap returns the underlying error.
@@ -1430,40 +1507,63 @@ func (e *CureError) Error() string { return e.Err.Error() }
 type DependencyCureError []*CureError
 
 // unwrapM recursively expands underlying errors into a caller-supplied map.
-func (e *DependencyCureError) unwrapM(me map[unique.Handle[ID]]*CureError) {
+func (e *DependencyCureError) unwrapM(
+	ctx context.Context,
+	ir *IRCache,
+	me map[unique.Handle[ID]]*CureError,
+) {
 	for _, err := range *e {
-		if _, ok := me[err.Ident]; ok {
+		if ctx.Err() != nil {
+			break
+		}
+
+		id := ir.Ident(err.A)
+		if _, ok := me[id]; ok {
 			continue
 		}
 		if _e, ok := err.Err.(*DependencyCureError); ok {
-			_e.unwrapM(me)
+			_e.unwrapM(ctx, ir, me)
 			continue
 		}
-		me[err.Ident] = err
+		me[id] = err
 	}
 }
 
 // unwrap recursively expands and deduplicates underlying errors.
-func (e *DependencyCureError) unwrap() DependencyCureError {
+func (e *DependencyCureError) unwrap(
+	ctx context.Context,
+	ir *IRCache,
+) DependencyCureError {
 	me := make(map[unique.Handle[ID]]*CureError)
-	e.unwrapM(me)
+	e.unwrapM(ctx, ir, me)
-	errs := slices.AppendSeq(
+	type ent struct {
-		make(DependencyCureError, 0, len(me)),
+		id  unique.Handle[ID]
-		maps.Values(me),
+		err *CureError
-	)
+	}
+	errs := make([]*ent, 0, len(me))
+	for id, err := range me {
+		errs = append(errs, &ent{id, err})
+	}
 
 	var identBuf [2]ID
-	slices.SortFunc(errs, func(a, b *CureError) int {
+	slices.SortFunc(errs, func(a, b *ent) int {
-		identBuf[0], identBuf[1] = a.Ident.Value(), b.Ident.Value()
+		identBuf[0], identBuf[1] = a.id.Value(), b.id.Value()
 		return slices.Compare(identBuf[0][:], identBuf[1][:])
 	})
 
-	return errs
+	_errs := make(DependencyCureError, len(errs))
+	for i, v := range errs {
+		_errs[i] = v.err
+	}
+	return _errs
 }
 
 // Unwrap returns a deduplicated slice of underlying errors.
 func (e *DependencyCureError) Unwrap() []error {
-	errs := e.unwrap()
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer cancel()
+
+	errs := e.unwrap(ctx, NewIR())
 	_errs := make([]error, len(errs))
 	for i, err := range errs {
 		_errs[i] = err
@@ -1473,14 +1573,23 @@ func (e *DependencyCureError) Unwrap() []error {
 
 // Error returns a user-facing multiline error message.
 func (e *DependencyCureError) Error() string {
-	errs := e.unwrap()
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer cancel()
+
+	ir := NewIR()
+	errs := e.unwrap(ctx, ir)
 	if len(errs) == 0 {
 		return "invalid dependency cure outcome"
 	}
 	var buf strings.Builder
 	buf.WriteString("errors curing dependencies:")
 	for _, err := range errs {
-		buf.WriteString("\n\t" + Encode(err.Ident.Value()) + ": " + err.Error())
+		buf.WriteString("\n\t" +
+			reportName(err.A, ir.Ident(err.A)) + ": " +
+			err.Error())
+	}
+	if ctx.Err() != nil {
+		buf.WriteString("\nerror resolution cancelled")
 	}
 	return buf.String()
 }
@@ -1650,16 +1759,44 @@ func (c *Cache) cure(a Artifact, curesExempt bool) (
 		return
 	}
 
-	var checksums string
+	var (
+		checksums   string
+		substitute  unique.Handle[ID]
+		alternative *check.Absolute
+	)
 	defer func() {
 		if err == nil && checksums != "" {
+			linkname := checksumLinknamePrefix + checksums
+
 			err = os.Symlink(
-				checksumLinknamePrefix+checksums,
+				linkname,
 				pathname.String(),
 			)
 			if err == nil {
 				err = zeroTimes(pathname.String())
 			}
+
+			if err == nil && alternative != nil {
+				c.substituteMu.Lock()
+				err = os.Symlink(
+					linkname,
+					alternative.String(),
+				)
+				if errors.Is(err, os.ErrExist) {
+					c.msg.Verbosef(
+						"creating alternative over %s for artifact %s",
+						Encode(substitute.Value()), ids,
+					)
+					err = nil
+				}
+				if err == nil {
+					err = zeroTimes(alternative.String())
+				}
+				if err == nil && checksum != zeroChecksum {
+					c.substitute[substitute] = checksum
+				}
+				c.substituteMu.Unlock()
+			}
 		}
 	}()
 
@@ -1856,11 +1993,64 @@ func (c *Cache) cure(a Artifact, curesExempt bool) (
 			f.deps[deps[i]] = p
 		}
 
+		sh := sha512.New384()
+		err = c.encode(sh, a, f.deps)
+		if err != nil {
+			return
+		}
+
+		buf := c.getIdentBuf()
+		sh.Sum(buf[wordSize:wordSize])
+		substitute = unique.Make(ID(buf[wordSize:]))
+		substitutes := Encode(substitute.Value())
+		c.putIdentBuf(buf)
+		alternative = c.base.Append(
+			dirSubstitute,
+			substitutes,
+		)
+
+		if c.flags&CIgnoreSubstitutes == 0 {
+			var substituteChecksum unique.Handle[Checksum]
+			substituteChecksum, err = c.loadSubstitute(substitute)
+			if err != nil {
+				return
+			}
+			if substituteChecksum != zeroChecksum {
+				checksum = substituteChecksum
+				checksums = Encode(checksum.Value())
+				checksumPathname = c.base.Append(
+					dirChecksum,
+					checksums,
+				)
+				if _, err = os.Lstat(c.base.Append(
+					dirStatus,
+					substitutes,
+				).String()); err == nil {
+					err = os.Symlink(substitutes, c.base.Append(
+						dirStatus,
+						ids,
+					).String())
+				} else if errors.Is(err, os.ErrNotExist) {
+					err = nil
+				}
+				return
+			}
+		}
+
 		defer f.destroy(&err)
 		if err = c.enterCure(a, curesExempt); err != nil {
 			return
 		}
 		err = ca.Cure(&f)
+		if err == nil && f.status != nil {
+			err = os.Link(c.base.Append(
+				dirStatus,
+				ids,
+			).String(), c.base.Append(
+				dirStatus,
+				substitutes,
+			).String())
+		}
 		c.exitCure(a, curesExempt)
 		if err != nil {
 			return
@@ -1953,7 +2143,7 @@ func (pending *pendingArtifactDep) cure(c *Cache) {
 	}
 
 	pending.errsMu.Lock()
-	*pending.errs = append(*pending.errs, &CureError{c.Ident(pending.a), err})
+	*pending.errs = append(*pending.errs, &CureError{pending.a, err})
 	pending.errsMu.Unlock()
 }
 
@@ -1969,6 +2159,52 @@ func (c *Cache) OpenStatus(a Artifact) (r io.ReadSeekCloser, err error) {
 	return
 }
 
+// Fault holds the pathname and termination time of an [Artifact] fault entry.
+type Fault struct {
+	*check.Absolute
+	t uint64
+}
+
+// Time returns the instant in time where the fault occurred.
+func (f Fault) Time() time.Time { return time.Unix(0, int64(f.t)) }
+
+// Open opens the underlying entry for reading.
+func (f Fault) Open() (io.ReadCloser, error) { return os.Open(f.Absolute.String()) }
+
+// Destroy removes the underlying fault entry.
+func (f Fault) Destroy() error { return os.Remove(f.Absolute.String()) }
+
+// ReadFaults returns fault entries for an [Artifact].
+func (c *Cache) ReadFaults(a Artifact) (faults []Fault, err error) {
+	prefix := Encode(c.Ident(a).Value()) + "."
+	var dents []os.DirEntry
+	if dents, err = os.ReadDir(c.base.Append(dirFault).String()); err != nil {
+		return
+	}
+
+	for _, dent := range dents {
+		name := dent.Name()
+		if !strings.HasPrefix(name, prefix) {
+			continue
+		}
+		var t uint64
+		t, err = strconv.ParseUint(name[len(prefix):], 10, 64)
+		if err != nil {
+			return
+		}
+
+		faults = append(faults, Fault{c.base.Append(
+			dirFault,
+			name,
+		), t})
+	}
+
+	slices.SortFunc(faults, func(a, b Fault) int {
+		return cmp.Compare(a.t, b.t)
+	})
+	return
+}
+
 // Abort cancels all pending cures and waits for them to clean up, but does not
 // close the cache.
 func (c *Cache) Abort() {
@@ -2068,9 +2304,11 @@ func open(
 	}
 
 	for _, name := range []string{
+		dirSubstitute,
 		dirIdentifier,
 		dirChecksum,
 		dirStatus,
+		dirFault,
 		dirWork,
 	} {
 		if err := os.MkdirAll(
@@ -2093,6 +2331,7 @@ func open(
 
 		irCache: zeroIRCache(),
 
+		substitute:   make(map[unique.Handle[ID]]unique.Handle[Checksum]),
 		ident:        make(map[unique.Handle[ID]]unique.Handle[Checksum]),
 		identErr:     make(map[unique.Handle[ID]]error),
 		identPending: make(map[unique.Handle[ID]]*pendingCure),

internal/pkg/pkg_test.go

@@ -16,9 +16,12 @@ import (
 	"path/filepath"
 	"reflect"
 	"strconv"
+	"strings"
 	"sync"
 	"syscall"
 	"testing"
+	"testing/fstest"
+	"time"
 	"unique"
 	"unsafe"
 
@@ -242,6 +245,41 @@ func newDestroyArtifactFunc(a pkg.Artifact) func(
 	}
 }
 
+// destroyStatus counts non-substitution status entries and destroys them.
+func destroyStatus(t *testing.T, base *check.Absolute, c, s int) {
+	dents, err := os.ReadDir(base.Append("status").String())
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var gotC, gotS int
+	for _, dent := range dents {
+		if err = os.Remove(base.Append(
+			"status",
+			dent.Name(),
+		).String()); err != nil {
+			t.Fatal(err)
+		}
+
+		if dent.Type().IsRegular() {
+			gotC++
+			continue
+		}
+		if dent.Type()&fs.ModeSymlink == fs.ModeSymlink {
+			gotS++
+			continue
+		}
+		t.Errorf("%s: %s", dent.Name(), dent.Type())
+	}
+
+	if gotC != c {
+		t.Errorf("status: c = %d, want %d", gotC, c)
+	}
+	if gotS != s {
+		t.Errorf("status: s = %d, want %d", gotS, s)
+	}
+}
+
 func TestIdent(t *testing.T) {
 	t.Parallel()
 
@@ -286,6 +324,99 @@ func TestIdent(t *testing.T) {
 	}
 }
 
+// An expectsKnown describes an expected file or directory.
+type expectsKnown interface {
+	// hash returns the checksum of the represented data.
+	hash() (checksum pkg.Checksum)
+}
+
+// An expectsChecksum is a prepared checksum value.
+type expectsChecksum pkg.Checksum
+
+// hash returns e.
+func (e expectsChecksum) hash() pkg.Checksum { return e }
+
+// An expectsFile is the contents of a file expected by the test suite.
+type expectsFile []byte
+
+// hash computes the checksum of e.
+func (e expectsFile) hash() (checksum pkg.Checksum) {
+	h := sha512.New384()
+	h.Write(e)
+	h.Sum(checksum[:0])
+	return
+}
+
+// An expectsFS describes the state of a filesystem expected by the test suite.
+type expectsFS fstest.MapFS
+
+// hash computes the checksum of e.
+func (e expectsFS) hash() (checksum pkg.Checksum) {
+	if err := pkg.HashFS(&checksum, fstest.MapFS(e), "."); err != nil {
+		panic(err)
+	}
+	return
+}
+
+// expectsFrom generates expectsFS for a filesystem directory.
+func expectsFrom(pathname string) string {
+	var buf strings.Builder
+	buf.WriteString("expectsFS{\n")
+	if err := filepath.WalkDir(pathname, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		var rel string
+		if rel, err = filepath.Rel(pathname, path); err != nil {
+			return err
+		}
+		buf.WriteString("\t" + strconv.Quote(rel) + ": {Mode: ")
+
+		var fi fs.FileInfo
+		if fi, err = d.Info(); err != nil {
+			return err
+		}
+		mode := fi.Mode()
+
+		switch {
+		case mode.IsDir():
+			buf.WriteString("fs.ModeDir | 0" +
+				strconv.FormatInt(int64(mode&^fs.ModeDir), 8))
+
+		case mode&fs.ModeSymlink != 0:
+			buf.WriteString("fs.ModeSymlink | 0" +
+				strconv.FormatInt(int64(mode&^fs.ModeSymlink), 8) +
+				", Data: []byte(")
+			var linkname string
+			if linkname, err = os.Readlink(path); err != nil {
+				return err
+			}
+			buf.WriteString(strconv.Quote(linkname))
+			buf.WriteByte(')')
+
+		case mode.IsRegular():
+			buf.WriteString("0" + strconv.FormatInt(int64(mode), 8))
+			var p []byte
+			if p, err = os.ReadFile(path); err != nil {
+				return err
+			}
+
+			if len(p) > 0 {
+				buf.WriteString(", Data: []byte(")
+				buf.WriteString(strconv.Quote(unsafe.String(unsafe.SliceData(p), len(p))))
+				buf.WriteByte(')')
+			}
+		}
+		buf.WriteString("},\n")
+		return nil
+	}); err != nil {
+		panic(err)
+	}
+	buf.WriteString("}")
+	return buf.String()
+}
+
 // cacheTestCase is a test case passed to checkWithCache where a new instance
 // of [pkg.Cache] is prepared for the test case, and is validated and removed
 // on test completion.
@@ -294,9 +425,15 @@ type cacheTestCase struct {
 	flags int
 	early func(t *testing.T, base *check.Absolute)
 	f     func(t *testing.T, base *check.Absolute, c *pkg.Cache)
-	want  pkg.Checksum
+	want  expectsFS
 }
 
+const (
+	// checkDestroySubstitutes arranges for substitutes to be destroyed before
+	// measurement during checkWithCache.
+	checkDestroySubstitutes = 1 << (iota + 32)
+)
+
 // checkWithCache runs a slice of cacheTestCase.
 func checkWithCache(t *testing.T, testCases []cacheTestCase) {
 	t.Helper()
@@ -328,7 +465,7 @@ func checkWithCache(t *testing.T, testCases []cacheTestCase) {
 			msg := message.New(log.New(os.Stderr, "cache: ", 0))
 			msg.SwapVerbose(testing.Verbose())
 
-			flags := tc.flags
+			flags := tc.flags | pkg.CSuppressInit
 
 			if info.CanDegrade {
 				if _, err := landlock.GetABI(); err != nil {
@@ -377,19 +514,34 @@ func checkWithCache(t *testing.T, testCases []cacheTestCase) {
 				}
 			}
 
-			// destroy non-deterministic status files
+			// destroy non-deterministic substitutes
-			if err := os.RemoveAll(base.Append("status").String()); err != nil {
+			if tc.flags&checkDestroySubstitutes != 0 {
+				substitute := base.Append("substitute")
+				if err := os.RemoveAll(substitute.String()); err != nil {
+					t.Fatal(err)
+				} else if err = os.Mkdir(substitute.String(), 0700); err != nil {
+					t.Fatal(err)
+				}
+			}
+
+			// destroy empty status directory
+			if err := syscall.Rmdir(base.Append("status").String()); err != nil {
+				t.Error(expectsFrom(base.Append("status").String()))
 				t.Fatal(err)
 			}
 
+			// destroy empty fault directory
+			if err := os.Remove(base.Append("fault").String()); err != nil {
+				t.Fatal(err)
+			}
+
+			want := tc.want.hash()
+
 			var checksum pkg.Checksum
 			if err := pkg.HashDir(&checksum, base); err != nil {
 				t.Fatalf("HashDir: error = %v", err)
-			} else if checksum != tc.want {
+			} else if checksum != want {
-				t.Fatalf("HashDir: %v", &pkg.ChecksumMismatchError{
+				t.Fatal(expectsFrom(base.String()))
-					Got:  checksum,
-					Want: tc.want,
-				})
 			}
 
 			if err := scrubFunc(); err != nil {
@@ -408,10 +560,10 @@ func checkWithCache(t *testing.T, testCases []cacheTestCase) {
 			// validate again to make sure scrub did not condemn anything
 			if err := pkg.HashDir(&checksum, base); err != nil {
 				t.Fatalf("HashDir: error = %v", err)
-			} else if checksum != tc.want {
+			} else if checksum != want {
 				t.Fatalf("(scrubbed) HashDir: %v", &pkg.ChecksumMismatchError{
 					Got:  checksum,
-					Want: tc.want,
+					Want: want,
 				})
 			}
 		})
@@ -425,7 +577,7 @@ type cureStep struct {
 	a pkg.Artifact
 
 	pathname *check.Absolute
-	checksum pkg.Checksum
+	output   expectsKnown
 	err      error
 }
 
@@ -446,17 +598,34 @@ func cureMany(t *testing.T, c *pkg.Cache, steps []cureStep) {
 	for _, step := range steps {
 		t.Log("cure step:", step.name)
 		if pathname, checksum, err := c.Cure(step.a); !reflect.DeepEqual(err, step.err) {
+			faults, _err := c.ReadFaults(step.a)
+			if _err != nil {
+				t.Errorf("ReadFaults: error = %v", _err)
+			}
+
+			var p []byte
+			for _, fault := range faults {
+				p, _err = os.ReadFile(fault.String())
+				if _err != nil {
+					t.Error(_err)
+					continue
+				}
+				t.Log(string(p))
+				t.Logf("faulting cure terminated %s ago", time.Since(faults[0].Time()))
+			}
 			t.Fatalf("Cure: error = %v, want %v", err, step.err)
 		} else if step.pathname != ignorePathname && !pathname.Is(step.pathname) {
 			t.Fatalf("Cure: pathname = %q, want %q", pathname, step.pathname)
-		} else if checksum != makeChecksumH(step.checksum) {
+		} else if step.output == nil || checksum != makeChecksumH(step.output.hash()) {
-			if checksum == (unique.Handle[pkg.Checksum]{}) {
+			if pathname != nil {
-				checksum = unique.Make(pkg.Checksum{})
+				if name, _err := filepath.EvalSymlinks(pathname.String()); _err != nil {
+					t.Fatal(_err)
+				} else {
+					t.Fatal(expectsFrom(name))
+				}
+			} else if checksum != (unique.Handle[pkg.Checksum]{}) {
+				t.Fatalf("Cure: unexpected checksum %s", pkg.Encode(checksum.Value()))
 			}
-			t.Fatalf(
-				"Cure: checksum = %s, want %s",
-				pkg.Encode(checksum.Value()), pkg.Encode(step.checksum),
-			)
 		} else {
 			v := any(err)
 			if err == nil {
@@ -517,18 +686,12 @@ func newWantScrubError(base *check.Absolute) *pkg.ScrubError {
 func TestCache(t *testing.T) {
 	t.Parallel()
 
-	const testdata = "" +
+	testdata := expectsFile("" +
 		"\x00\x00\x00\x00" +
 		"\xad\x0b\x00" +
 		"\x04" +
 		"\xfe\xfe\x00\x00" +
-		"\xfe\xca\x00\x00"
+		"\xfe\xca\x00\x00")
-
-	testdataChecksum := func() pkg.Checksum {
-		h := sha512.New384()
-		h.Write([]byte(testdata))
-		return (pkg.Checksum)(h.Sum(nil))
-	}()
 
 	testCases := []cacheTestCase{
 		{"file", pkg.CValidateKnown | pkg.CAssumeChecksum, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
@@ -546,36 +709,45 @@ func TestCache(t *testing.T) {
 				"identifier",
 				"cafebabecafebabecafebabecafebabecafebabecafebabecafebabecafebabe",
 			)
+			failingFile := newStubFile(
+				pkg.KindHTTPGet,
+				pkg.ID{0xff, 3},
+				nil,
+				nil, struct {
+					_ []byte
+					stub.UniqueError
+				}{UniqueError: 0xbad},
+			)
 
 			cureMany(t, c, []cureStep{
 				{"initial file", newStubFile(
 					pkg.KindHTTPGet,
 					identifier,
-					&testdataChecksum,
+					new(testdata.hash()),
-					[]byte(testdata), nil,
+					testdata, nil,
-				), wantPathname, testdataChecksum, nil},
+				), wantPathname, testdata, nil},
 
 				{"identical content", newStubFile(
 					pkg.KindHTTPGet,
 					identifier0,
-					&testdataChecksum,
+					new(testdata.hash()),
-					[]byte(testdata), nil,
+					testdata, nil,
-				), wantPathname0, testdataChecksum, nil},
+				), wantPathname0, testdata, nil},
 
 				{"existing entry", newStubFile(
 					pkg.KindHTTPGet,
 					identifier,
-					&testdataChecksum,
+					new(testdata.hash()),
-					[]byte(testdata), nil,
+					testdata, nil,
-				), wantPathname, testdataChecksum, nil},
+				), wantPathname, testdata, nil},
 
 				{"checksum mismatch", newStubFile(
 					pkg.KindHTTPGet,
 					pkg.ID{0xff, 0},
 					new(pkg.Checksum),
-					[]byte(testdata), nil,
+					testdata, nil,
-				), nil, pkg.Checksum{}, &pkg.ChecksumMismatchError{
+				), nil, nil, &pkg.ChecksumMismatchError{
-					Got: testdataChecksum,
+					Got: testdata.hash(),
 				}},
 
 				{"store without validation", newStubFile(
@@ -586,7 +758,7 @@ func TestCache(t *testing.T) {
 				), base.Append(
 					"identifier",
 					"vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX",
-				), pkg.Checksum{
+				), expectsChecksum{
 					0xbe, 0xc0, 0x21, 0xb4, 0xf3, 0x68,
 					0xe3, 0x06, 0x91, 0x34, 0xe0, 0x12,
 					0xc2, 0xb4, 0x30, 0x70, 0x83, 0xd3,
@@ -600,7 +772,7 @@ func TestCache(t *testing.T) {
 				{"incomplete implementation", struct{ pkg.Artifact }{&stubArtifact{
 					kind:   pkg.KindExec,
 					params: []byte("artifact overridden to be incomplete"),
-				}}, nil, pkg.Checksum{}, pkg.InvalidArtifactError(pkg.MustDecode(
+				}}, nil, nil, pkg.InvalidArtifactError(pkg.MustDecode(
 					"E__uZ1sLIvb84vzSm5Uezb03RogsiaeTt1nfIVv8TKnnf4LqwtSi-smdHhlkZrUJ",
 				))},
 
@@ -609,40 +781,32 @@ func TestCache(t *testing.T) {
 					pkg.ID{0xff, 1},
 					nil,
 					nil, stub.UniqueError(0xcafe),
-				), nil, pkg.Checksum{}, stub.UniqueError(0xcafe)},
+				), nil, nil, stub.UniqueError(0xcafe)},
 
 				{"error caching", newStubFile(
 					pkg.KindHTTPGet,
 					pkg.ID{0xff, 1},
 					nil,
 					nil, nil,
-				), nil, pkg.Checksum{}, stub.UniqueError(0xcafe)},
+				), nil, nil, stub.UniqueError(0xcafe)},
 
-				{"cache hit bad type", overrideChecksum{testdataChecksum, overrideIdent{pkg.ID{0xff, 2}, &stubArtifact{
+				{"cache hit bad type", overrideChecksum{testdata.hash(), overrideIdent{pkg.ID{0xff, 2}, &stubArtifact{
 					kind: pkg.KindTar,
-				}}}, nil, pkg.Checksum{}, pkg.InvalidFileModeError(
+				}}}, nil, nil, pkg.InvalidFileModeError(
 					0400,
 				)},
 
 				{"noncomparable error", &stubArtifactF{
 					kind:   pkg.KindExec,
 					params: []byte("artifact with dependency returning noncomparable error"),
-					deps: []pkg.Artifact{newStubFile(
+					deps:   []pkg.Artifact{failingFile},
-						pkg.KindHTTPGet,
-						pkg.ID{0xff, 3},
-						nil,
-						nil, struct {
-							_ []byte
-							stub.UniqueError
-						}{UniqueError: 0xbad},
-					)},
 
 					cure: func(f *pkg.FContext) error {
 						panic("attempting to cure impossible artifact")
 					},
-				}, nil, pkg.Checksum{}, &pkg.DependencyCureError{
+				}, nil, nil, &pkg.DependencyCureError{
 					{
-						Ident: unique.Make(pkg.ID{0xff, 3}),
+						A: failingFile,
 						Err: struct {
 							_ []byte
 							stub.UniqueError
@@ -662,18 +826,18 @@ func TestCache(t *testing.T) {
 				cureMany(t, c0, []cureStep{
 					{"cache hit ident", overrideIdent{
 						id: identifier,
-					}, wantPathname, testdataChecksum, nil},
+					}, wantPathname, testdata, nil},
 
 					{"cache miss checksum match", newStubFile(
 						pkg.KindHTTPGet,
-						testdataChecksum,
+						testdata.hash(),
 						nil,
-						[]byte(testdata),
+						testdata,
 						nil,
 					), base.Append(
 						"identifier",
-						pkg.Encode(testdataChecksum),
+						pkg.Encode(testdata.hash()),
-					), testdataChecksum, nil},
+					), testdata, nil},
 				})
 
 				// cure after close
@@ -686,7 +850,23 @@ func TestCache(t *testing.T) {
 					t.Fatalf("(closed) Cure: error = %v", err)
 				}
 			}
-		}, pkg.MustDecode("St9rlE-mGZ5gXwiv_hzQ_B8bZP-UUvSNmf4nHUZzCMOumb6hKnheZSe0dmnuc4Q2")},
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"checksum": {Mode: fs.ModeDir | 0700},
+			"checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX": {Mode: 0400, Data: []byte{0}},
+			"checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq": {Mode: 0400, Data: []byte{0, 0, 0, 0, 0xad, 0xb, 0, 4, 0xfe, 0xfe, 0, 0, 0xfe, 0xca, 0, 0}},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX")},
+			"identifier/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
+			"identifier/cafebabecafebabecafebabecafebabecafebabecafebabecafebabecafebabe": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
+			"identifier/deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"directory", pkg.CAssumeChecksum, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			id := pkg.MustDecode(
@@ -721,9 +901,16 @@ func TestCache(t *testing.T) {
 					).String(),
 				)
 			}
-			wantChecksum := pkg.MustDecode(
+			want := expectsFS{
-				"qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b",
+				".": {Mode: fs.ModeDir | 0500},
-			)
+
+				"check": {Mode: 0400, Data: []byte{0, 0}},
+
+				"lib":            {Mode: fs.ModeDir | 0700},
+				"lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
+
+				"lib/pkgconfig": {Mode: fs.ModeDir | 0700},
+			}
 			wantPathname := base.Append(
 				"identifier",
 				pkg.Encode(id),
@@ -777,33 +964,33 @@ func TestCache(t *testing.T) {
 			}
 
 			cureMany(t, c, []cureStep{
-				{"initial directory", overrideChecksum{wantChecksum, overrideIdent{id, &stubArtifact{
+				{"initial directory", overrideChecksum{want.hash(), overrideIdent{id, &stubArtifact{
 					kind: pkg.KindTar,
 					cure: makeSample,
-				}}}, wantPathname, wantChecksum, nil},
+				}}}, wantPathname, want, nil},
 
-				{"identical identifier", overrideChecksum{wantChecksum, overrideIdent{id, &stubArtifact{
+				{"identical identifier", overrideChecksum{want.hash(), overrideIdent{id, &stubArtifact{
 					kind: pkg.KindTar,
-				}}}, wantPathname, wantChecksum, nil},
+				}}}, wantPathname, want, nil},
 
 				{"identical checksum", overrideIdent{id0, &stubArtifact{
 					kind: pkg.KindTar,
 					cure: makeSample,
-				}}, wantPathname0, wantChecksum, nil},
+				}}, wantPathname0, want, nil},
 
 				{"cure fault", overrideIdent{pkg.ID{0xff, 0}, &stubArtifact{
 					kind: pkg.KindTar,
 					cure: func(t *pkg.TContext) error {
 						return makeGarbage(t.GetWorkDir(), stub.UniqueError(0xcafe))
 					},
-				}}, nil, pkg.Checksum{}, stub.UniqueError(0xcafe)},
+				}}, nil, nil, stub.UniqueError(0xcafe)},
 
 				{"checksum mismatch", overrideChecksum{pkg.Checksum{}, overrideIdent{pkg.ID{0xff, 1}, &stubArtifact{
 					kind: pkg.KindTar,
 					cure: func(t *pkg.TContext) error {
 						return makeGarbage(t.GetWorkDir(), nil)
 					},
-				}}}, nil, pkg.Checksum{}, &pkg.ChecksumMismatchError{
+				}}}, nil, nil, &pkg.ChecksumMismatchError{
 					Got: pkg.MustDecode(
 						"CUx-3hSbTWPsbMfDhgalG4Ni_GmR9TnVX8F99tY_P5GtkYvczg9RrF5zO0jX9XYT",
 					),
@@ -812,27 +999,27 @@ func TestCache(t *testing.T) {
 				{"cache hit bad type", newStubFile(
 					pkg.KindHTTPGet,
 					pkg.ID{0xff, 2},
-					&wantChecksum,
+					new(want.hash()),
-					[]byte(testdata), nil,
+					testdata, nil,
-				), nil, pkg.Checksum{}, pkg.InvalidFileModeError(
+				), nil, nil, pkg.InvalidFileModeError(
 					fs.ModeDir | 0500,
 				)},
 
 				{"openFile directory", overrideIdent{pkg.ID{0xff, 3}, &stubArtifact{
 					kind: pkg.KindTar,
 					cure: func(t *pkg.TContext) error {
-						r, err := t.Open(overrideChecksumFile{checksum: wantChecksum})
+						r, err := t.Open(overrideChecksumFile{checksum: want.hash()})
 						if err != nil {
 							panic(err)
 						}
 						_, err = io.ReadAll(r)
 						return err
 					},
-				}}, nil, pkg.Checksum{}, &os.PathError{
+				}}, nil, nil, &os.PathError{
 					Op: "read",
 					Path: base.Append(
 						"checksum",
-						pkg.Encode(wantChecksum),
+						pkg.Encode(want.hash()),
 					).String(),
 					Err: syscall.EISDIR,
 				}},
@@ -842,14 +1029,14 @@ func TestCache(t *testing.T) {
 					cure: func(t *pkg.TContext) error {
 						return nil
 					},
-				}}, nil, pkg.Checksum{}, pkg.NoOutputError{}},
+				}}, nil, nil, pkg.NoOutputError{}},
 
 				{"file output", overrideIdent{pkg.ID{0xff, 5}, &stubArtifact{
 					kind: pkg.KindTar,
 					cure: func(t *pkg.TContext) error {
 						return os.WriteFile(t.GetWorkDir().String(), []byte{0}, 0400)
 					},
-				}}, nil, pkg.Checksum{}, errors.New("non-file artifact produced regular file")},
+				}}, nil, nil, errors.New("non-file artifact produced regular file")},
 
 				{"symlink output", overrideIdent{pkg.ID{0xff, 6}, &stubArtifact{
 					kind: pkg.KindTar,
@@ -859,11 +1046,111 @@ func TestCache(t *testing.T) {
 							t.GetWorkDir().String(),
 						)
 					},
-				}}, nil, pkg.Checksum{}, pkg.InvalidFileModeError(
+				}}, nil, nil, pkg.InvalidFileModeError(
 					fs.ModeSymlink | 0777,
 				)},
+
+				{"alternative", &stubArtifactF{
+					kind:   pkg.KindExec,
+					params: []byte("substitutable artifact"),
+					deps: []pkg.Artifact{newStubFile(
+						pkg.KindHTTPGet,
+						pkg.ID{0xff, 8},
+						nil,
+						[]byte("substitutable dependency"),
+						nil,
+					)},
+
+					cure: func(f *pkg.FContext) error {
+						return makeSample(&f.TContext)
+					},
+				}, base.Append(
+					"identifier",
+					"xMDWovje7OfyIaDy_2VnjpKxRqSOQ_LoeD946t-3WsS2V2SeMJ7nDGrNfpa4Pbc-",
+				), want, nil},
+
+				{"substitutable", &stubArtifactF{
+					kind:   pkg.KindExec,
+					params: []byte("substitutable artifact"),
+					deps: []pkg.Artifact{newStubFile(
+						pkg.KindHTTPGet,
+						pkg.ID{0xff, 10},
+						nil,
+						[]byte("substitutable dependency"),
+						nil,
+					)},
+
+					cure: func(f *pkg.FContext) error {
+						panic("substitution missed")
+					},
+				}, base.Append(
+					"identifier",
+					"k2ilgG5KQ9NXnMoT2oB6NdwOnSPRn_H24oXQc4l6qOYIxIG9XfuEczeyrR8UEv_f",
+				), want, nil},
 			})
-		}, pkg.MustDecode("WVpvsVqVKg9Nsh744x57h51AuWUoUR2nnh8Md-EYBQpk6ziyTuUn6PLtF2e0Eu_d")},
+
+			if c0, err := unsafeOpen(
+				t.Context(),
+				message.New(nil),
+				0, 0, 0, base, false,
+			); err != nil {
+				t.Fatalf("open: error = %v", err)
+			} else {
+				t.Cleanup(c.Close)
+				cureMany(t, c0, []cureStep{
+					{"substitutable", &stubArtifactF{
+						kind:   pkg.KindExec,
+						params: []byte("substitutable artifact"),
+						deps: []pkg.Artifact{newStubFile(
+							pkg.KindHTTPGet,
+							pkg.ID{0xff, 0xff, 0xfd, 0xfd},
+							nil,
+							[]byte("substitutable dependency"),
+							nil,
+						)},
+
+						cure: func(f *pkg.FContext) error {
+							panic("substitution missed")
+						},
+					}, base.Append(
+						"identifier",
+						"_EmV5nsYZ2UWHgRmLDMU8i-rJWDx-kv5_1pFrzQI7vMMCM5mAXivO8UZtVfOqMR_",
+					), want, nil},
+				})
+			}
+
+			if dents, err := os.ReadDir(base.Append("status").String()); err != nil {
+				t.Fatal(err)
+			} else if len(dents) > 0 {
+				t.Errorf("ReadDir: %v", dents)
+			}
+
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"checksum": {Mode: fs.ModeDir | 0700},
+			"checksum/7lfQ4QwSpV8nw7IDh0JiQ_jqUPrPv3_Vfie034RxsSy-cy4vO8DVvxgpx2LW08oO":                {Mode: 0400, Data: []byte("substitutable dependency")},
+			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b":                {Mode: fs.ModeDir | 0500},
+			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/check":          {Mode: 0400, Data: []byte{0, 0}},
+			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib":            {Mode: fs.ModeDir | 0700},
+			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib/pkgconfig":  {Mode: fs.ModeDir | 0700},
+			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
+			"identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
+			"identifier/_EmV5nsYZ2UWHgRmLDMU8i-rJWDx-kv5_1pFrzQI7vMMCM5mAXivO8UZtVfOqMR_": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
+			"identifier/___9_QAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/7lfQ4QwSpV8nw7IDh0JiQ_jqUPrPv3_Vfie034RxsSy-cy4vO8DVvxgpx2LW08oO")},
+			"identifier/_wgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/7lfQ4QwSpV8nw7IDh0JiQ_jqUPrPv3_Vfie034RxsSy-cy4vO8DVvxgpx2LW08oO")},
+			"identifier/_woAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/7lfQ4QwSpV8nw7IDh0JiQ_jqUPrPv3_Vfie034RxsSy-cy4vO8DVvxgpx2LW08oO")},
+			"identifier/k2ilgG5KQ9NXnMoT2oB6NdwOnSPRn_H24oXQc4l6qOYIxIG9XfuEczeyrR8UEv_f": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
+			"identifier/xMDWovje7OfyIaDy_2VnjpKxRqSOQ_LoeD946t-3WsS2V2SeMJ7nDGrNfpa4Pbc-": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+			"substitute/OyBGorh72Z9kVw35JUa8FbqDbpR4DqT-MX1jic0uKN5PdYmUBiAF38BRsIRnBigf": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
+
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"pending", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			wantErr := stub.UniqueError(0xcafe)
@@ -899,7 +1186,7 @@ func TestCache(t *testing.T) {
 					pkg.ID{0xff, 1},
 					nil,
 					nil, stub.UniqueError(0xbad),
-				), nil, pkg.Checksum{}, stub.UniqueError(0xbad)},
+				), nil, nil, stub.UniqueError(0xbad)},
 
 				{"file output", overrideIdent{pkg.ID{0xff, 2}, &stubArtifact{
 					kind: pkg.KindTar,
@@ -910,7 +1197,7 @@ func TestCache(t *testing.T) {
 							0400,
 						)
 					},
-				}}, nil, pkg.Checksum{}, errors.New(
+				}}, nil, nil, errors.New(
 					"non-file artifact produced regular file",
 				)},
 			})
@@ -932,7 +1219,13 @@ func TestCache(t *testing.T) {
 			for c.Done(unique.Make(pkg.ID{0xff})) != nil {
 			}
 			<-wCureDone
-		}, pkg.MustDecode("E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C")},
+		}, expectsFS{
+			".":          {Mode: fs.ModeDir | 0700},
+			"checksum":   {Mode: fs.ModeDir | 0700},
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"substitute": {Mode: fs.ModeDir | 0700},
+			"work":       {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"cancel abort block", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			var wg sync.WaitGroup
@@ -985,7 +1278,13 @@ func TestCache(t *testing.T) {
 
 			c.Close()
 			c.Abort()
-		}, pkg.MustDecode("E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C")},
+		}, expectsFS{
+			".":          {Mode: fs.ModeDir | 0700},
+			"checksum":   {Mode: fs.ModeDir | 0700},
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"substitute": {Mode: fs.ModeDir | 0700},
+			"work":       {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"no assume checksum", 0, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			makeGarbage := func(work *check.Absolute, wantErr error) error {
@@ -1002,10 +1301,12 @@ func TestCache(t *testing.T) {
 				return wantErr
 			}
 
-			wantChecksum := pkg.MustDecode("Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M")
+			want := expectsChecksum(pkg.MustDecode(
+				"Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M",
+			))
 
 			cureMany(t, c, []cureStep{
-				{"create", overrideChecksum{wantChecksum, overrideIdent{pkg.ID{0xff, 0}, &stubArtifact{
+				{"create", overrideChecksum{want.hash(), overrideIdent{pkg.ID{0xff, 0}, &stubArtifact{
 					kind: pkg.KindTar,
 					cure: func(t *pkg.TContext) error {
 						return makeGarbage(t.GetWorkDir(), nil)
@@ -1013,16 +1314,16 @@ func TestCache(t *testing.T) {
 				}}}, base.Append(
 					"identifier",
 					pkg.Encode(pkg.ID{0xff, 0}),
-				), wantChecksum, nil},
+				), want, nil},
 
-				{"reject", overrideChecksum{wantChecksum, overrideIdent{pkg.ID{0xfe, 1}, &stubArtifact{
+				{"reject", overrideChecksum{want.hash(), overrideIdent{pkg.ID{0xfe, 1}, &stubArtifact{
 					kind: pkg.KindTar,
 					cure: func(t *pkg.TContext) error {
 						return makeGarbage(t.GetWorkDir(), stub.UniqueError(0xbad))
 					},
-				}}}, nil, pkg.Checksum{}, stub.UniqueError(0xbad)},
+				}}}, nil, nil, stub.UniqueError(0xbad)},
 
-				{"match", overrideChecksum{wantChecksum, overrideIdent{pkg.ID{0xff, 1}, &stubArtifact{
+				{"match", overrideChecksum{want.hash(), overrideIdent{pkg.ID{0xff, 1}, &stubArtifact{
 					kind: pkg.KindTar,
 					cure: func(t *pkg.TContext) error {
 						return makeGarbage(t.GetWorkDir(), nil)
@@ -1030,9 +1331,23 @@ func TestCache(t *testing.T) {
 				}}}, base.Append(
 					"identifier",
 					pkg.Encode(pkg.ID{0xff, 1}),
-				), wantChecksum, nil},
+				), want, nil},
 			})
-		}, pkg.MustDecode("OC290t23aimNo2Rp2pPwan5GI2KRLRdOwYxXQMD9jw0QROgHnNXWodoWdV0hwu2w")},
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"checksum": {Mode: fs.ModeDir | 0700},
+			"checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M":       {Mode: fs.ModeDir | 0500},
+			"checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M/check": {Mode: 0400, Data: []byte{}},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/_wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M")},
+			"identifier/_wEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/Aubi5EG4_Y8DhL9bQ3Q4HFBhLRF7X5gt9D3CNCQfT-TeBtlRXc7Zi_JYZEMoCC7M")},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"scrub", 0, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			cureMany(t, c, []cureStep{
@@ -1044,7 +1359,7 @@ func TestCache(t *testing.T) {
 				), base.Append(
 					"identifier",
 					pkg.Encode(pkg.Checksum{0xfe, 0}),
-				), pkg.Checksum{0xff, 0}, nil},
+				), expectsChecksum{0xff, 0}, nil},
 			})
 
 			for _, p := range [][]string{
@@ -1077,7 +1392,13 @@ func TestCache(t *testing.T) {
 			if err := c.Scrub(1 << 6); !reflect.DeepEqual(err, wantErr) {
 				t.Fatalf("Scrub: error =\n%s\nwant\n%s", err, wantErr)
 			}
-		}, pkg.MustDecode("E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C")},
+		}, expectsFS{
+			".":          {Mode: fs.ModeDir | 0700},
+			"checksum":   {Mode: fs.ModeDir | 0700},
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"substitute": {Mode: fs.ModeDir | 0700},
+			"work":       {Mode: fs.ModeDir | 0700},
+		}},
 	}
 	checkWithCache(t, testCases)
 }
@@ -1135,6 +1456,11 @@ func TestErrors(t *testing.T) {
 		{"UnsupportedVariantError", pkg.UnsupportedVariantError(
 			"rosa",
 		), `unsupported variant "rosa"`},
+
+		{"UnsupportedArchError zero", pkg.UnsupportedArchError(""),
+			"invalid architecture name"},
+		{"UnsupportedArchError", pkg.UnsupportedArchError("riscv64"),
+			"unsupported architecture riscv64"},
 	}
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
@@ -1250,6 +1576,14 @@ errors during scrub:
 func TestDependencyCureError(t *testing.T) {
 	t.Parallel()
 
+	makeIdent := func(ident ...byte) pkg.Artifact {
+		var a overrideIdent
+		copy(a.id[:], ident)
+		// does not compare equal
+		a.TrivialArtifact = new(stubArtifact)
+		return a
+	}
+
 	testCases := []struct {
 		name   string
 		err    pkg.DependencyCureError
@@ -1257,51 +1591,51 @@ func TestDependencyCureError(t *testing.T) {
 		unwrap []error
 	}{
 		{"simple", pkg.DependencyCureError{
-			{Ident: unique.Make(pkg.ID{0xff, 9}), Err: stub.UniqueError(0xbad09)},
+			{A: makeIdent(0xff, 9), Err: stub.UniqueError(0xbad09)},
-			{Ident: unique.Make(pkg.ID{0xff, 0}), Err: stub.UniqueError(0xbad00)},
+			{A: makeIdent(0xff, 0), Err: stub.UniqueError(0xbad00)},
-			{Ident: unique.Make(pkg.ID{0xff, 0xf}), Err: stub.UniqueError(0xbad0f)},
+			{A: makeIdent(0xff, 0xf), Err: stub.UniqueError(0xbad0f)},
-			{Ident: unique.Make(pkg.ID{0xff, 1}), Err: stub.UniqueError(0xbad01)},
+			{A: makeIdent(0xff, 1), Err: stub.UniqueError(0xbad01)},
 		}, `errors curing dependencies:
 	_wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA: unique error 765184 injected by the test suite
 	_wEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA: unique error 765185 injected by the test suite
 	_wkAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA: unique error 765193 injected by the test suite
 	_w8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA: unique error 765199 injected by the test suite`, []error{
-			&pkg.CureError{Ident: unique.Make(pkg.ID{0xff, 0}), Err: stub.UniqueError(0xbad00)},
+			&pkg.CureError{A: makeIdent(0xff, 0), Err: stub.UniqueError(0xbad00)},
-			&pkg.CureError{Ident: unique.Make(pkg.ID{0xff, 1}), Err: stub.UniqueError(0xbad01)},
+			&pkg.CureError{A: makeIdent(0xff, 1), Err: stub.UniqueError(0xbad01)},
-			&pkg.CureError{Ident: unique.Make(pkg.ID{0xff, 9}), Err: stub.UniqueError(0xbad09)},
+			&pkg.CureError{A: makeIdent(0xff, 9), Err: stub.UniqueError(0xbad09)},
-			&pkg.CureError{Ident: unique.Make(pkg.ID{0xff, 0xf}), Err: stub.UniqueError(0xbad0f)},
+			&pkg.CureError{A: makeIdent(0xff, 0xf), Err: stub.UniqueError(0xbad0f)},
 		}},
 
 		{"dedup", pkg.DependencyCureError{
-			{Ident: unique.Make(pkg.ID{0xff, 9}), Err: stub.UniqueError(0xbad09)},
+			{A: makeIdent(0xff, 9), Err: stub.UniqueError(0xbad09)},
-			{Ident: unique.Make(pkg.ID{0xff, 0}), Err: stub.UniqueError(0xbad00)},
+			{A: makeIdent(0xff, 0), Err: stub.UniqueError(0xbad00)},
-			{Ident: unique.Make(pkg.ID{0xff, 0xfd}), Err: &pkg.DependencyCureError{
+			{A: makeIdent(0xff, 0xfd), Err: &pkg.DependencyCureError{
-				{Ident: unique.Make(pkg.ID{0xff, 9}), Err: stub.UniqueError(0xbad09)},
+				{A: makeIdent(0xff, 9), Err: stub.UniqueError(0xbad09)},
-				{Ident: unique.Make(pkg.ID{0xff, 0xc}), Err: &pkg.DependencyCureError{
+				{A: makeIdent(0xff, 0xc), Err: &pkg.DependencyCureError{
-					{Ident: unique.Make(pkg.ID{0xff, 0xf}), Err: stub.UniqueError(0xbad0f)},
+					{A: makeIdent(0xff, 0xf), Err: stub.UniqueError(0xbad0f)},
-					{Ident: unique.Make(pkg.ID{0xff, 0}), Err: stub.UniqueError(0xbad00)},
+					{A: makeIdent(0xff, 0), Err: stub.UniqueError(0xbad00)},
 				}},
-				{Ident: unique.Make(pkg.ID{0xff, 0}), Err: stub.UniqueError(0xbad00)},
+				{A: makeIdent(0xff, 0), Err: stub.UniqueError(0xbad00)},
-				{Ident: unique.Make(pkg.ID{0xff, 0}), Err: stub.UniqueError(0xbad00)},
+				{A: makeIdent(0xff, 0), Err: stub.UniqueError(0xbad00)},
 			}},
-			{Ident: unique.Make(pkg.ID{0xff, 0xff}), Err: &pkg.DependencyCureError{
+			{A: makeIdent(0xff, 0xff), Err: &pkg.DependencyCureError{
-				{Ident: unique.Make(pkg.ID{0xff, 9}), Err: stub.UniqueError(0xbad09)},
+				{A: makeIdent(0xff, 9), Err: stub.UniqueError(0xbad09)},
-				{Ident: unique.Make(pkg.ID{0xff, 0xc}), Err: &pkg.DependencyCureError{
+				{A: makeIdent(0xff, 0xc), Err: &pkg.DependencyCureError{
-					{Ident: unique.Make(pkg.ID{0xff, 0}), Err: stub.UniqueError(0xbad00)},
+					{A: makeIdent(0xff, 0), Err: stub.UniqueError(0xbad00)},
 				}},
-				{Ident: unique.Make(pkg.ID{0xff, 0}), Err: stub.UniqueError(0xbad00)},
+				{A: makeIdent(0xff, 0), Err: stub.UniqueError(0xbad00)},
 			}},
-			{Ident: unique.Make(pkg.ID{0xff, 0xf}), Err: stub.UniqueError(0xbad0f)},
+			{A: makeIdent(0xff, 0xf), Err: stub.UniqueError(0xbad0f)},
-			{Ident: unique.Make(pkg.ID{0xff, 1}), Err: stub.UniqueError(0xbad01)},
+			{A: makeIdent(0xff, 1), Err: stub.UniqueError(0xbad01)},
 		}, `errors curing dependencies:
 	_wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA: unique error 765184 injected by the test suite
 	_wEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA: unique error 765185 injected by the test suite
 	_wkAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA: unique error 765193 injected by the test suite
 	_w8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA: unique error 765199 injected by the test suite`, []error{
-			&pkg.CureError{Ident: unique.Make(pkg.ID{0xff, 0}), Err: stub.UniqueError(0xbad00)},
+			&pkg.CureError{A: makeIdent(0xff, 0), Err: stub.UniqueError(0xbad00)},
-			&pkg.CureError{Ident: unique.Make(pkg.ID{0xff, 1}), Err: stub.UniqueError(0xbad01)},
+			&pkg.CureError{A: makeIdent(0xff, 1), Err: stub.UniqueError(0xbad01)},
-			&pkg.CureError{Ident: unique.Make(pkg.ID{0xff, 9}), Err: stub.UniqueError(0xbad09)},
+			&pkg.CureError{A: makeIdent(0xff, 9), Err: stub.UniqueError(0xbad09)},
-			&pkg.CureError{Ident: unique.Make(pkg.ID{0xff, 0xf}), Err: stub.UniqueError(0xbad0f)},
+			&pkg.CureError{A: makeIdent(0xff, 0xf), Err: stub.UniqueError(0xbad0f)},
 		}},
 	}
 	for _, tc := range testCases {
@@ -1342,6 +1676,25 @@ func (a earlyFailureF) Cure(*pkg.FContext) error {
 	return stub.UniqueError(0xcafe)
 }
 
+func BenchmarkEarlyDCE(b *testing.B) {
+	msg := message.New(log.New(os.Stderr, "dce: ", 0))
+	msg.SwapVerbose(testing.Verbose())
+	c, err := pkg.Open(b.Context(), msg, 0, 0, 0, check.MustAbs(b.TempDir()))
+	if err != nil {
+		b.Fatal(err)
+	}
+	_, _, err = c.Cure(earlyFailureF(8))
+	if !errors.Is(err, stub.UniqueError(0xcafe)) {
+		b.Fatalf("Cure: error = %v", err)
+	}
+	c.Close()
+	dce := err.(*pkg.DependencyCureError)
+
+	for b.Loop() {
+		dce.Unwrap()
+	}
+}
+
 func TestDependencyCureErrorEarly(t *testing.T) {
 	t.Parallel()
 
@@ -1351,7 +1704,13 @@ func TestDependencyCureErrorEarly(t *testing.T) {
 			if !errors.Is(err, stub.UniqueError(0xcafe)) {
 				t.Fatalf("Cure: error = %v", err)
 			}
-		}, pkg.MustDecode("E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C")},
+		}, expectsFS{
+			".":          {Mode: fs.ModeDir | 0700},
+			"checksum":   {Mode: fs.ModeDir | 0700},
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"substitute": {Mode: fs.ModeDir | 0700},
+			"work":       {Mode: fs.ModeDir | 0700},
+		}},
 	})
 }
 

internal/pkg/tar_test.go

@@ -20,6 +20,31 @@ import (
 func TestTar(t *testing.T) {
 	t.Parallel()
 
+	want := expectsFS{
+		".": {Mode: fs.ModeDir | 0500},
+
+		"checksum": {Mode: fs.ModeDir | 0500},
+		"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP":                {Mode: fs.ModeDir | 0500},
+		"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check":          {Mode: 0400, Data: []byte{0, 0}},
+		"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib":            {Mode: fs.ModeDir | 0500},
+		"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig":  {Mode: fs.ModeDir | 0500},
+		"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
+
+		"identifier": {Mode: fs.ModeDir | 0500},
+		"identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
+		"identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
+
+		"work": {Mode: fs.ModeDir | 0500},
+	}
+	wantEncode := pkg.Encode(want.hash())
+
+	wantExpand := expectsFS{
+		".": {Mode: fs.ModeDir | 0500},
+
+		"libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
+	}
+	wantExpandEncode := pkg.Encode(wantExpand.hash())
+
 	checkWithCache(t, []cacheTestCase{
 		{"http", 0, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			checkTarHTTP(t, base, c, fstest.MapFS{
@@ -37,10 +62,32 @@ func TestTar(t *testing.T) {
 				"identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
 
 				"work": {Mode: fs.ModeDir | 0700},
-			}, pkg.MustDecode(
+			}, want)
-				"cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM",
+		}, expectsFS{
-			))
+			".": {Mode: fs.ModeDir | 0700},
-		}, pkg.MustDecode("NQTlc466JmSVLIyWklm_u8_g95jEEb98PxJU-kjwxLpfdjwMWJq0G8ze9R4Vo1Vu")},
+
+			"checksum":                             {Mode: fs.ModeDir | 0700},
+			"checksum/" + wantEncode:               {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantEncode + "/checksum": {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantEncode + "/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP":                {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantEncode + "/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check":          {Mode: 0400, Data: []byte{0, 0}},
+			"checksum/" + wantEncode + "/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib":            {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantEncode + "/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
+			"checksum/" + wantEncode + "/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig":  {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantEncode + "/identifier": {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantEncode + "/identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
+			"checksum/" + wantEncode + "/identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
+			"checksum/" + wantEncode + "/work": {Mode: fs.ModeDir | 0500},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/W5S65DEhawz_WKaok5NjUKLmnD9dNl5RPauNJjcOVcB3VM4eGhSaLGmXbL8vZpiw": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantEncode)},
+			"identifier/rg7F1D5hwv6o4xctjD5zDq4i5MD0mArTsUIWfhUbik8xC6Bsyt3mjXXOm3goojTz": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantEncode)},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"http expand", 0, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			checkTarHTTP(t, base, c, fstest.MapFS{
@@ -48,10 +95,23 @@ func TestTar(t *testing.T) {
 
 				"lib":            {Mode: fs.ModeDir | 0700},
 				"lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
-			}, pkg.MustDecode(
+			}, wantExpand)
-				"CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN",
+		}, expectsFS{
-			))
+			".": {Mode: fs.ModeDir | 0700},
-		}, pkg.MustDecode("hSoSSgCYTNonX3Q8FjvjD1fBl-E-BQyA6OTXro2OadXqbST4tZ-akGXszdeqphRe")},
+
+			"checksum":                     {Mode: fs.ModeDir | 0700},
+			"checksum/" + wantExpandEncode: {Mode: fs.ModeDir | 0500},
+			"checksum/" + wantExpandEncode + "/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/W5S65DEhawz_WKaok5NjUKLmnD9dNl5RPauNJjcOVcB3VM4eGhSaLGmXbL8vZpiw": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantExpandEncode)},
+			"identifier/_v1blm2h-_KA-dVaawdpLas6MjHc6rbhhFS8JWwx8iJxZGUu8EBbRrhr5AaZ9PJL": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantExpandEncode)},
+
+			"substitute": {Mode: fs.ModeDir | 0700},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 	})
 }
 
@@ -60,7 +120,7 @@ func checkTarHTTP(
 	base *check.Absolute,
 	c *pkg.Cache,
 	testdataFsys fs.FS,
-	wantChecksum pkg.Checksum,
+	want expectsKnown,
 ) {
 	var testdata string
 	{
@@ -194,24 +254,24 @@ func checkTarHTTP(
 		{"file", a, base.Append(
 			"identifier",
 			pkg.Encode(wantIdent),
-		), wantChecksum, nil},
+		), want, nil},
 
 		{"directory", pkg.NewTar(
 			&tarDir,
 			pkg.TarGzip,
-		), ignorePathname, wantChecksum, nil},
+		), ignorePathname, want, nil},
 
 		{"multiple entries", pkg.NewTar(
 			&tarDirMulti,
 			pkg.TarGzip,
-		), nil, pkg.Checksum{}, errors.New(
+		), nil, nil, errors.New(
 			"input directory does not contain a single regular file",
 		)},
 
 		{"bad type", pkg.NewTar(
 			&tarDirType,
 			pkg.TarGzip,
-		), nil, pkg.Checksum{}, errors.New(
+		), nil, nil, errors.New(
 			"input directory does not contain a single regular file",
 		)},
 
@@ -221,6 +281,6 @@ func checkTarHTTP(
 			cure: func(t *pkg.TContext) error {
 				return stub.UniqueError(0xcafe)
 			},
-		}, pkg.TarGzip), nil, pkg.Checksum{}, stub.UniqueError(0xcafe)},
+		}, pkg.TarGzip), nil, nil, stub.UniqueError(0xcafe)},
 	})
 }

internal/rosa/acl.go

@@ -65,7 +65,7 @@ ln -s ../../system/bin/perl /usr/bin
 	), version
 }
 func init() {
-	artifactsM[Attr] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newAttr,
 
 		Name:        "attr",
@@ -73,7 +73,7 @@ func init() {
 		Website:     "https://savannah.nongnu.org/projects/attr/",
 
 		ID: 137,
-	}
+	})
 }
 
 func (t Toolchain) newACL() (pkg.Artifact, string) {
@@ -94,7 +94,7 @@ func (t Toolchain) newACL() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[ACL] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newACL,
 
 		Name:        "acl",
@@ -106,5 +106,5 @@ func init() {
 		},
 
 		ID: 16,
-	}
+	})
 }

internal/rosa/all.go

@@ -1,401 +0,0 @@
-package rosa
-
-import (
-	"context"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"net/http"
-	"strconv"
-	"sync"
-
-	"hakurei.app/internal/pkg"
-)
-
-// PArtifact is a lazily-initialised [pkg.Artifact] preset.
-type PArtifact int
-
-const (
-	LLVM PArtifact = iota
-
-	// EarlyInit is the Rosa OS init program.
-	EarlyInit
-	// ImageSystem is the Rosa OS /system image.
-	ImageSystem
-	// ImageInitramfs is the Rosa OS initramfs archive.
-	ImageInitramfs
-
-	// Kernel is the generic Rosa OS Linux kernel.
-	Kernel
-	// KernelHeaders is an installation of kernel headers for [Kernel].
-	KernelHeaders
-	// KernelSource is a writable kernel source tree installed to [AbsUsrSrc].
-	KernelSource
-	// Firmware is firmware blobs for use with the Linux kernel.
-	Firmware
-
-	ACL
-	ArgpStandalone
-	Attr
-	Autoconf
-	Automake
-	BC
-	Bash
-	Binutils
-	Bison
-	Bzip2
-	CMake
-	Connman
-	Coreutils
-	Curl
-	DBus
-	DTC
-	Diffutils
-	Elfutils
-	Fakeroot
-	Findutils
-	Flex
-	Fuse
-	GMP
-	GLib
-	Gawk
-	GenInitCPIO
-	Gettext
-	Git
-	Glslang
-	GnuTLS
-	Go
-	Gperf
-	Grep
-	Gzip
-	Hakurei
-	HakureiDist
-	IPTables
-	Kmod
-	LIT
-	LibX11
-	LibXau
-	LibXext
-	Libbsd
-	Libcap
-	Libdrm
-	Libev
-	Libexpat
-	Libffi
-	Libgd
-	Libglvnd
-	Libiconv
-	Libmd
-	Libmnl
-	Libpciaccess
-	Libnftnl
-	Libpsl
-	Libseccomp
-	Libtasn1
-	Libtool
-	Libucontext
-	Libunistring
-	Libxshmfence
-	Libxml2
-	Libxslt
-	Libxtrans
-	M4
-	MPC
-	MPFR
-	Make
-	Meson
-	Mksh
-	MuslFts
-	MuslObstack
-	NSS
-	NSSCACert
-	Ncurses
-	Nettle
-	Ninja
-	OpenSSL
-	P11Kit
-	PCRE2
-	Parallel
-	Patch
-	Perl
-	PerlLocaleGettext
-	PerlMIMECharset
-	PerlModuleBuild
-	PerlPodParser
-	PerlSGMLS
-	PerlTermReadKey
-	PerlTextCharWidth
-	PerlTextWrapI18N
-	PerlUnicodeLineBreak
-	PerlYAMLTiny
-	PkgConfig
-	Procps
-	Python
-	PythonFlitCore
-	PythonHatchling
-	PythonIniConfig
-	PythonMako
-	PythonMarkupSafe
-	PythonPackaging
-	PythonPathspec
-	PythonPluggy
-	PythonPyTest
-	PythonPyYAML
-	PythonPygments
-	PythonSetuptools
-	PythonSetuptoolsSCM
-	PythonTroveClassifiers
-	PythonVCSVersioning
-	PythonWheel
-	QEMU
-	Rdfind
-	Readline
-	Rsync
-	Sed
-	SPIRVHeaders
-	SPIRVLLVMTranslator
-	SPIRVTools
-	SquashfsTools
-	Strace
-	TamaGo
-	Tar
-	Texinfo
-	Toybox
-	toyboxEarly
-	Unzip
-	UtilLinux
-	Wayland
-	WaylandProtocols
-	XCB
-	XCBProto
-	XDGDBusProxy
-	XZ
-	XorgProto
-	Zlib
-	Zstd
-
-	// PresetUnexportedStart is the first unexported preset.
-	PresetUnexportedStart
-
-	llvmSource = iota - 1
-	// earlyCompilerRT is an early, standalone compiler-rt installation for the
-	// standalone runtimes build.
-	//
-	// earlyCompilerRT must only be loaded by [LLVM].
-	earlyCompilerRT
-	// earlyRuntimes is an early, standalone installation of LLVM runtimes to
-	// work around the cmake build system leaking the system LLVM installation
-	// when invoking the newly built toolchain.
-	//
-	// earlyRuntimes must only be loaded by [LLVM].
-	earlyRuntimes
-
-	buildcatrust
-	utilMacros
-
-	// Musl is a standalone libc that does not depend on the toolchain.
-	Musl
-	// muslHeaders is a system installation of [Musl] headers.
-	muslHeaders
-
-	// gcc is a hacked-to-pieces GCC toolchain meant for use in intermediate
-	// stages only. This preset and its direct output must never be exposed.
-	gcc
-
-	// nettle3 is an older version of [Nettle].
-	nettle3
-
-	// Stage0 is a tarball containing all compile-time dependencies of artifacts
-	// part of the [Std] toolchain.
-	Stage0
-
-	// PresetEnd is the total number of presets and does not denote a preset.
-	PresetEnd
-)
-
-// P represents multiple [PArtifact] and is stable through JSON.
-type P []PArtifact
-
-// MarshalJSON represents [PArtifact] by their [Metadata.Name].
-func (s P) MarshalJSON() ([]byte, error) {
-	names := make([]string, len(s))
-	for i, p := range s {
-		names[i] = GetMetadata(p).Name
-	}
-	return json.Marshal(names)
-}
-
-// UnmarshalJSON resolves the value created by MarshalJSON back to [P].
-func (s *P) UnmarshalJSON(data []byte) error {
-	var names []string
-	if err := json.Unmarshal(data, &names); err != nil {
-		return err
-	}
-
-	*s = make(P, len(names))
-	for i, name := range names {
-		if p, ok := ResolveName(name); !ok {
-			return fmt.Errorf("unknown artifact %q", name)
-		} else {
-			(*s)[i] = p
-		}
-	}
-	return nil
-}
-
-// Metadata is stage-agnostic information of a [PArtifact] not directly
-// representable in the resulting [pkg.Artifact].
-type Metadata struct {
-	f func(t Toolchain) (a pkg.Artifact, version string)
-
-	// Unique package name.
-	Name string `json:"name"`
-	// Short user-facing description.
-	Description string `json:"description"`
-	// Project home page.
-	Website string `json:"website,omitempty"`
-
-	// Runtime dependencies.
-	Dependencies P `json:"dependencies"`
-
-	// Project identifier on [Anitya].
-	//
-	// [Anitya]: https://release-monitoring.org/
-	ID int `json:"-"`
-
-	// Optional custom version checking behaviour.
-	latest func(v *Versions) string
-}
-
-// GetLatest returns the latest version described by v.
-func (meta *Metadata) GetLatest(v *Versions) string {
-	if meta.latest != nil {
-		return meta.latest(v)
-	}
-	return v.Latest
-}
-
-// Unversioned denotes an unversioned [PArtifact].
-const Unversioned = "\x00"
-
-// UnpopulatedIDError is returned by [Metadata.GetLatest] for an instance of
-// [Metadata] where ID is not populated.
-type UnpopulatedIDError struct{}
-
-func (UnpopulatedIDError) Unwrap() error { return errors.ErrUnsupported }
-func (UnpopulatedIDError) Error() string { return "Anitya ID is not populated" }
-
-// Versions are package versions returned by Anitya.
-type Versions struct {
-	// The latest version for the project, as determined by the version sorting algorithm.
-	Latest string `json:"latest_version"`
-	// List of all versions that aren’t flagged as pre-release.
-	Stable []string `json:"stable_versions"`
-	// List of all versions stored, sorted from newest to oldest.
-	All []string `json:"versions"`
-}
-
-// getStable returns the first Stable version, or Latest if that is unavailable.
-func (v *Versions) getStable() string {
-	if len(v.Stable) == 0 {
-		return v.Latest
-	}
-	return v.Stable[0]
-}
-
-// GetVersions returns versions fetched from Anitya.
-func (meta *Metadata) GetVersions(ctx context.Context) (*Versions, error) {
-	if meta.ID == 0 {
-		return nil, UnpopulatedIDError{}
-	}
-
-	var resp *http.Response
-	if req, err := http.NewRequestWithContext(
-		ctx,
-		http.MethodGet,
-		"https://release-monitoring.org/api/v2/versions/?project_id="+
-			strconv.Itoa(meta.ID),
-		nil,
-	); err != nil {
-		return nil, err
-	} else {
-		req.Header.Set("User-Agent", "Rosa/1.1")
-		if resp, err = http.DefaultClient.Do(req); err != nil {
-			return nil, err
-		}
-	}
-
-	var v Versions
-	err := json.NewDecoder(resp.Body).Decode(&v)
-	return &v, errors.Join(err, resp.Body.Close())
-}
-
-var (
-	// artifactsM is an array of [PArtifact] metadata.
-	artifactsM [PresetEnd]Metadata
-
-	// artifacts stores the result of Metadata.f.
-	artifacts [_toolchainEnd][len(artifactsM)]struct {
-		a pkg.Artifact
-		v string
-	}
-	// artifactsOnce is for lazy initialisation of artifacts.
-	artifactsOnce [_toolchainEnd][len(artifactsM)]sync.Once
-
-	// presetOpts globally modifies behaviour of presets.
-	presetOpts int
-)
-
-const (
-	// OptSkipCheck skips running all test suites.
-	OptSkipCheck = 1 << iota
-	// OptLLVMNoLTO disables LTO in all [LLVM] stages.
-	OptLLVMNoLTO
-)
-
-// Flags returns the current preset flags
-func Flags() int { return presetOpts }
-
-// zero zeros the value pointed to by p.
-func zero[T any](p *T) { var v T; *p = v }
-
-// DropCaches arranges for all cached [pkg.Artifact] to be freed some time after
-// it returns. Must not be used concurrently with any other function from this
-// package.
-func DropCaches(flags int) {
-	presetOpts = flags
-	zero(&artifacts)
-	zero(&artifactsOnce)
-}
-
-// GetMetadata returns [Metadata] of a [PArtifact].
-func GetMetadata(p PArtifact) *Metadata { return &artifactsM[p] }
-
-// construct constructs a [pkg.Artifact] corresponding to a [PArtifact] once.
-func (t Toolchain) construct(p PArtifact) {
-	artifactsOnce[t][p].Do(func() {
-		artifacts[t][p].a, artifacts[t][p].v = artifactsM[p].f(t)
-	})
-}
-
-// Load returns the resulting [pkg.Artifact] of [PArtifact].
-func (t Toolchain) Load(p PArtifact) pkg.Artifact {
-	t.construct(p)
-	return artifacts[t][p].a
-}
-
-// Version returns the version string of [PArtifact].
-func (t Toolchain) Version(p PArtifact) string {
-	t.construct(p)
-	return artifacts[t][p].v
-}
-
-// ResolveName returns a [PArtifact] by name.
-func ResolveName(name string) (p PArtifact, ok bool) {
-	for i := range PresetUnexportedStart {
-		if name == artifactsM[i].Name {
-			return i, true
-		}
-	}
-	return 0, false
-}

internal/rosa/all_test.go

@@ -1,81 +0,0 @@
-package rosa_test
-
-import (
-	"testing"
-
-	"hakurei.app/internal/rosa"
-)
-
-func TestLoad(t *testing.T) {
-	t.Parallel()
-
-	for i := range rosa.PresetEnd {
-		p := rosa.PArtifact(i)
-		t.Run(rosa.GetMetadata(p).Name, func(t *testing.T) {
-			t.Parallel()
-
-			rosa.Std.Load(p)
-		})
-	}
-}
-
-func BenchmarkAll(b *testing.B) {
-	flags := rosa.Flags()
-	b.Cleanup(func() { rosa.DropCaches(flags) })
-
-	for b.Loop() {
-		for i := range rosa.PresetEnd {
-			rosa.Std.Load(rosa.PArtifact(i))
-		}
-
-		b.StopTimer()
-		rosa.DropCaches(0)
-		b.StartTimer()
-	}
-}
-
-func TestResolveName(t *testing.T) {
-	t.Parallel()
-
-	for i := range rosa.PresetUnexportedStart {
-		p := i
-		name := rosa.GetMetadata(p).Name
-		t.Run(name, func(t *testing.T) {
-			t.Parallel()
-
-			if got, ok := rosa.ResolveName(name); !ok {
-				t.Fatal("ResolveName: ok = false")
-			} else if got != p {
-				t.Fatalf("ResolveName: %d, want %d", got, p)
-			}
-		})
-	}
-}
-func TestResolveNameUnexported(t *testing.T) {
-	t.Parallel()
-
-	for i := rosa.PresetUnexportedStart; i < rosa.PresetEnd; i++ {
-		p := i
-		name := rosa.GetMetadata(p).Name
-		t.Run(name, func(t *testing.T) {
-			t.Parallel()
-
-			if got, ok := rosa.ResolveName(name); ok {
-				t.Fatalf("ResolveName: resolved unexported preset %d", got)
-			}
-		})
-	}
-}
-
-func TestUnique(t *testing.T) {
-	t.Parallel()
-
-	names := make(map[string]struct{})
-	for i := range rosa.PresetEnd {
-		name := rosa.GetMetadata(rosa.PArtifact(i)).Name
-		if _, ok := names[name]; ok {
-			t.Fatalf("name %s is not unique", name)
-		}
-		names[name] = struct{}{}
-	}
-}

internal/rosa/argp-standalone.go

@@ -26,11 +26,11 @@ install -D -m755 libargp.a /work/system/lib/libargp.a
 	), version
 }
 func init() {
-	artifactsM[ArgpStandalone] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newArgpStandalone,
 
 		Name:        "argp-standalone",
 		Description: "hierarchical argument parsing library broken out from glibc",
 		Website:     "http://www.lysator.liu.se/~nisse/misc/",
-	}
+	})
 }

internal/rosa/azalea/azalea.go

@@ -0,0 +1,348 @@
+// Package azalea implements a proof-of-concept, domain-specific language for
+// Rosa OS software packaging.
+package azalea
+
+import (
+	"errors"
+	"io"
+	"strconv"
+	"text/scanner"
+)
+
+// idents are runes accepted in an identifier.
+var idents = [...]bool{
+	'0': true, '1': true, '2': true, '3': true, '4': true, '5': true, '6': true,
+	'7': true, '8': true, '9': true,
+
+	'A': true, 'B': true, 'C': true, 'D': true, 'E': true, 'F': true, 'G': true,
+	'H': true, 'I': true, 'J': true, 'K': true, 'L': true, 'M': true, 'N': true,
+	'O': true, 'P': true, 'Q': true, 'R': true, 'S': true, 'T': true, 'U': true,
+	'V': true, 'W': true, 'X': true, 'Y': true, 'Z': true,
+
+	'a': true, 'b': true, 'c': true, 'd': true, 'e': true, 'f': true, 'g': true,
+	'h': true, 'i': true, 'j': true, 'k': true, 'l': true, 'm': true, 'n': true,
+	'o': true, 'p': true, 'q': true, 'r': true, 's': true, 't': true, 'u': true,
+	'v': true, 'w': true, 'x': true, 'y': true, 'z': true,
+
+	'-': true, '_': true,
+}
+
+// TokenError describes an unexpected token.
+type TokenError [2]rune
+
+func (e TokenError) Error() string {
+	return "expected " + scanner.TokenString(e[0]) +
+		", found " + scanner.TokenString(e[1])
+}
+
+// ExprError is an unexpected token encountered while parsing an expression.
+type ExprError rune
+
+func (e ExprError) Error() string {
+	return "unexpected token " + scanner.TokenString(rune(e))
+}
+
+// must1 returns v, or panics if err is not nil.
+func must1[T any](v T, err error) T {
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+// parser retains the current token.
+type parser struct {
+	s   scanner.Scanner
+	tok rune
+}
+
+// scan advances the underlying scanner to the next token, storing its result.
+func (p *parser) scan() rune { p.tok = p.s.Scan(); return p.tok }
+
+// expects panics with [TokenError] for an unexpected tok.
+func (p *parser) expects(expects rune) {
+	if p.tok != expects {
+		panic(TokenError{expects, p.tok})
+	}
+}
+
+// scanAs advances the scanner for an expected token.
+func (p *parser) scanAs(expects rune) { p.scan(); p.expects(expects) }
+
+// An Int is the value represented by an integer literal.
+type Int int64
+
+func (v Int) GoString() string {
+	return "azalea.Int(" + strconv.FormatInt(int64(v), 10) + ")"
+}
+
+// parseInt parses the current token as a base 10 representation of a 64-bit
+// signed integer.
+func (p *parser) parseInt() Int {
+	v, err := strconv.ParseInt(p.s.TokenText(), 10, 64)
+	return must1(Int(v), err)
+}
+
+// A String holds the unquoted content of a string literal.
+type String string
+
+func (v String) GoString() string {
+	return "azalea.String(" + strconv.Quote(string(v)) + ")"
+}
+
+// parseString parses the current token as a string.
+func (p *parser) parseString() String {
+	s, err := strconv.Unquote(p.s.TokenText())
+	return must1(String(s), err)
+}
+
+// An Ident holds the name of an identifier.
+type Ident string
+
+func (v Ident) GoString() string {
+	return "azalea.Ident(" + strconv.Quote(string(v)) + ")"
+}
+
+// A Val are statements joined by the '+' operator. Only the [String] type
+// supports concatenation.
+type Val []any
+
+// parseVal parses until the end of the [Val].
+func (p *parser) parseVal() (v Val) {
+	v = append(v, p.parseExpr())
+	for p.tok == '+' {
+		p.scan()
+		v = append(v, p.parseExpr())
+	}
+	return
+}
+
+// An Array holds statements in an array.
+type Array []Val
+
+// A KV holds a key/value pair.
+type KV struct {
+	K String
+	V Val
+}
+
+// An Arg represents an argument of [Func].
+type Arg struct {
+	K []Ident
+	V Val
+	R bool
+}
+
+// Func is a function call or package declaration.
+type Func struct {
+	// Function or package identifier.
+	Ident Ident
+	// Whether this is a package declaration.
+	Package bool
+	// Key-value arguments.
+	Args []Arg
+}
+
+// parseExpr parses the current expression.
+func (p *parser) parseExpr() any {
+	switch p.tok {
+	case scanner.Int:
+		v := p.parseInt()
+		p.scan()
+		return v
+
+	case scanner.String, scanner.RawString:
+		v := p.parseString()
+		p.scan()
+		return v
+
+	case scanner.Ident:
+		var v Func
+		v.Ident = Ident(p.s.TokenText())
+		if v.Package = v.Ident == "package"; v.Package {
+			p.scanAs(scanner.Ident)
+			v.Ident = Ident(p.s.TokenText())
+		}
+
+		p.scan()
+		switch p.tok {
+		case '{':
+			for {
+				p.scan()
+				switch p.tok {
+				case '}':
+					p.scan()
+					return v
+
+				case scanner.Ident:
+					break
+
+				default:
+					panic(TokenError{scanner.Ident, p.tok})
+				}
+
+				arg := Arg{K: []Ident{Ident(p.s.TokenText())}}
+				delim := true
+			arg:
+				for {
+					p.scan()
+					switch p.tok {
+					case ',':
+						if delim {
+							delim = false
+							continue
+						}
+						panic(ExprError(p.tok))
+
+					case scanner.Ident:
+						if delim {
+							panic(TokenError{',', p.tok})
+						}
+						delim = true
+						arg.K = append(arg.K, Ident(p.s.TokenText()))
+
+					default:
+						break arg
+					}
+				}
+				switch p.tok {
+				case '=':
+					break
+
+				case '*':
+					arg.R = true
+					p.scanAs('=')
+
+				default:
+					panic(TokenError{'=', p.tok})
+				}
+				p.scan()
+				arg.V = p.parseVal()
+				v.Args = append(v.Args, arg)
+				p.expects(';')
+			}
+
+		default:
+			return v.Ident
+		}
+
+	case '{':
+		var v []KV
+		for {
+			p.scan()
+			switch p.tok {
+			case '}':
+				p.scan()
+				return v
+
+			case scanner.String:
+				pair := KV{K: p.parseString()}
+				p.scan()
+				switch p.tok {
+				case ';':
+					break
+
+				case ':':
+					p.scan()
+					pair.V = p.parseVal()
+					p.expects(';')
+					break
+
+				default:
+					panic(ExprError(p.tok))
+				}
+				v = append(v, pair)
+
+			default:
+				panic(ExprError(p.tok))
+			}
+		}
+
+	case '[':
+		var (
+			v     Array
+			delim bool
+		)
+		p.scan()
+		for {
+			switch p.tok {
+			case ',':
+				if delim {
+					p.scan()
+					delim = false
+					continue
+				}
+				panic(ExprError(','))
+			case ']':
+				p.scan()
+				return v
+			case scanner.EOF:
+				panic(ExprError(scanner.EOF))
+			default:
+				if delim {
+					panic(TokenError{',', p.tok})
+				}
+				delim = true
+				break
+			}
+			v = append(v, p.parseVal())
+		}
+
+	default:
+		panic(ExprError(p.tok))
+	}
+}
+
+// ScanError is the error count parsing all expressions.
+type ScanError int
+
+func (ScanError) Error() string {
+	return "aborting due to scanning errors"
+}
+
+// Parse parses expressions from r.
+func Parse(r io.Reader) (e []any, err error) {
+	var p parser
+	p.s.Init(r)
+
+	p.s.Mode = scanner.ScanIdents |
+		scanner.ScanInts |
+		scanner.ScanStrings |
+		scanner.ScanRawStrings |
+		scanner.ScanComments |
+		scanner.SkipComments
+	p.s.IsIdentRune = func(ch rune, i int) bool {
+		if i == 0 && ch >= '0' && ch <= '9' {
+			return false
+		}
+		return ch > 0 && ch < rune(len(idents)) && idents[ch]
+	}
+
+	defer func() {
+		v := recover()
+		if v == nil {
+			return
+		}
+
+		_err, ok := v.(error)
+		if !ok {
+			panic(v)
+		}
+
+		if err == nil {
+			err = _err
+			return
+		}
+		err = errors.Join(err, _err)
+	}()
+
+	p.scan()
+	for p.tok != scanner.EOF {
+		e = append(e, p.parseExpr())
+	}
+
+	if p.s.ErrorCount != 0 {
+		err = ScanError(p.s.ErrorCount)
+	}
+	return
+}

internal/rosa/azalea/azalea_test.go

@@ -0,0 +1,169 @@
+package azalea_test
+
+import (
+	_ "embed"
+	"reflect"
+	"strings"
+	"testing"
+	"text/scanner"
+
+	. "hakurei.app/internal/rosa/azalea"
+)
+
+//go:embed testdata/gcc.az
+var sample string
+
+func TestParse(t *testing.T) {
+	t.Parallel()
+
+	testCases := []struct {
+		name string
+		data string
+		want []any
+		err  error
+	}{
+		{"invalid", "}", nil, ExprError('}')},
+		{"bad sep", "f{v?}", nil, TokenError{'=', '?'}},
+		{"bad ident", "f{9}", nil, TokenError{scanner.Ident, scanner.Int}},
+		{"share bad sep", "f { v,,v = v; }", nil, ExprError(',')},
+		{"share missing sep", "f { v v }", nil, TokenError{',', scanner.Ident}},
+
+		{"ident", `v`, []any{Ident("v")}, nil},
+		{"concat", `f { v = v+"\xfd"+p{}+9; }`, []any{Func{
+			Ident: "f",
+
+			Args: []Arg{{K: []Ident{"v"}, V: Val{
+				Ident("v"),
+				String("\xfd"),
+				Func{Ident: "p"},
+				Int(9),
+			}}},
+		}}, nil},
+		{"truncated string concat", `f { v = v+; }`, nil,
+			ExprError(';')},
+
+		{"empty pairs", `{}`, []any{[]KV(nil)}, nil},
+		{"short kv", `{"\x00":v;}`, []any{[]KV{
+			{K: "\x00", V: Val{Ident("v")}},
+		}}, nil},
+		{"truncated kv", `{"\x00"`, nil, ExprError(scanner.EOF)},
+		{"ident kv", `{v="";}`, nil, ExprError(scanner.Ident)},
+
+		{"empty array", `[]`, []any{Array(nil)}, nil},
+		{"integer array", `[9]`, []any{Array{{Int(9)}}}, nil},
+		{"short array", `[ "\x00" ]`, []any{
+			Array{{String("\x00")}},
+		}, nil},
+		{"short array delim", `[ "\x00", ]`, []any{
+			Array{{String("\x00")}},
+		}, nil},
+		{"missing array value", `[ "\x00", , v ]`, nil, ExprError(',')},
+		{"missing array delimiter", `[ v0 v1 ]`, nil, TokenError{',', scanner.Ident}},
+		{"truncated array", `[ "\x00"`, nil,
+			ExprError(scanner.EOF)},
+
+		{"gcc", sample, []any{Func{
+			Ident:   Ident("gcc"),
+			Package: true,
+
+			Args: []Arg{
+				{K: []Ident{Ident("description")}, V: Val{String("The GNU Compiler Collection")}},
+				{K: []Ident{Ident("website")}, V: Val{String("https://www.gnu.org/software/gcc")}},
+				{K: []Ident{Ident("anitya")}, V: Val{Int(6502)}},
+
+				{K: []Ident{Ident("version")}, V: Val{String("16.1.0")}, R: true},
+				{K: []Ident{Ident("source")}, V: Val{Func{
+					Ident: Ident("remoteTar"),
+
+					Args: []Arg{
+						{K: []Ident{Ident("url")}, V: Val{
+							String("https://ftp.tsukuba.wide.ad.jp/software/gcc/releases/"),
+							String("gcc-"),
+							Ident("version"),
+							String("/gcc-"),
+							Ident("version"),
+							String(".tar.gz"),
+						}},
+						{K: []Ident{Ident("checksum")}, V: Val{String("4ASoWbxaA2FW7PAB0zzHDPC5XnNhyaAyjtDPpGzceSLeYnEIXsNYZR3PA_Zu5P0K")}},
+						{K: []Ident{Ident("compress")}, V: Val{Ident("gzip")}},
+					},
+				}}},
+				{K: []Ident{Ident("patches")}, V: Val{Array{
+					{String("musl-off64_t-loff_t.patch")},
+					{String("musl-legacy-lfs.patch")},
+				}}},
+
+				{K: []Ident{Ident("exclusive")}, V: Val{Ident("true")}},
+
+				{K: []Ident{Ident("exec")}, V: Val{Func{
+					Ident: Ident("make"),
+
+					Args: []Arg{
+						{K: []Ident{Ident("configure")}, V: Val{[]KV{
+							{K: String("disable-multilib")},
+							{K: String("enable-default-pie")},
+							{K: String("disable-nls")},
+							{K: String("with-gnu-as")},
+							{K: String("with-gnu-ld")},
+							{K: String("with-system-zlib")},
+							{K: String("enable-languages"), V: Val{String("c,c++,go")}},
+							{K: String("with-native-system-header-dir"), V: Val{String("/system/include")}},
+							{K: String("with-multilib-list"), V: Val{Func{
+								Ident: Ident("arch"),
+
+								Args: []Arg{
+									{K: []Ident{Ident("amd64"), Ident("arm64")}, V: Val{String("''")}},
+									{K: []Ident{Ident("default")}, V: Val{Ident("unset")}},
+								},
+							}}},
+						}}},
+						{K: []Ident{Ident("make")}, V: Val{Array{
+							{String("BOOT_CFLAGS='-O2 -g'")},
+							{
+								Func{Ident: Ident("noop"), Args: []Arg{{K: []Ident{Ident("key")}, V: Val{Ident("value")}}}},
+								String("\x00"),
+							},
+							{String("bootstrap")},
+						}}},
+
+						{K: []Ident{Ident("skip-check")}, V: Val{Ident("true")}},
+					},
+				}}},
+
+				{K: []Ident{Ident("inputs")}, V: Val{Array{
+					{Ident("binutils")},
+					{Ident("mpc")},
+					{Ident("zlib")},
+					{Ident("libucontext")},
+					{Ident("kernel-headers")},
+				}}},
+			},
+		}}, nil},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
+			p, err := Parse(strings.NewReader(tc.data))
+			if !reflect.DeepEqual(p, tc.want) {
+				t.Errorf("Parse: %#v, want %#v", p, tc.want)
+			}
+			if !reflect.DeepEqual(err, tc.err) {
+				t.Errorf("Parse: error = %v, want %v", err, tc.err)
+			}
+		})
+	}
+}
+
+func BenchmarkParse(b *testing.B) {
+	r := strings.NewReader(sample)
+	for b.Loop() {
+		if _, err := Parse(r); err != nil {
+			b.Fatal(err)
+		}
+
+		b.StopTimer()
+		r.Reset(sample)
+		b.StartTimer()
+	}
+}

internal/rosa/azalea/evaluate.go

@@ -0,0 +1,308 @@
+package azalea
+
+import (
+	"errors"
+	"fmt"
+	"maps"
+	"reflect"
+	"unique"
+)
+
+// Value are types supported by the language.
+type Value interface {
+	bool | int64 | string | []string | [][2]string
+}
+
+type (
+	// FArg is an argument passed to [F].
+	FArg struct {
+		K unique.Handle[Ident]
+		V any
+		R bool
+	}
+	// FArgs are arguments passed to [F].
+	FArgs []FArg
+
+	// F is the implementation of a [Func].
+	F struct {
+		F func(isPackage bool, args FArgs) (v any, set bool, err error)
+		V map[unique.Handle[Ident]]any
+	}
+)
+
+// Apply applies named arguments and rejects unused arguments.
+func (args FArgs) Apply(v map[unique.Handle[Ident]]any) error {
+	for _, arg := range args {
+		if arg.V == nil {
+			// unset
+			continue
+		}
+
+		r, ok := v[arg.K]
+		if !ok {
+			if arg.R {
+				continue
+			}
+			return UndefinedError(arg.K.Value())
+		}
+		err := storeE(r, arg.V)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// A Frame refers to local variables and debugging information.
+type Frame struct {
+	// Local constants.
+	Val map[unique.Handle[Ident]]any
+	// Functions.
+	Func map[unique.Handle[Ident]]F
+}
+
+// UnsupportedExprError is an expression with invalid concrete type.
+type UnsupportedExprError struct{ E any }
+
+func (e UnsupportedExprError) Error() string {
+	return fmt.Sprintf("unsupported expression %#v", e.E)
+}
+
+// UndefinedError is an identifier not defined in any stack frame visible to the
+// expression containing it.
+type UndefinedError Ident
+
+func (e UndefinedError) Error() string {
+	return "undefined: " + string(e)
+}
+
+// evaluate is evaluateAny with a type parameter.
+func evaluate[T Value](s []Frame, expr any, rp *T) bool {
+	return evaluateAny(s, expr, rp)
+}
+
+// TypeError is an unexpected type during evaluation.
+type TypeError struct {
+	Concrete, Asserted reflect.Type
+}
+
+func (e TypeError) Error() string {
+	return "expected " + e.Asserted.String() + ", got " + e.Concrete.String()
+}
+
+func (e TypeError) Is(err error) bool {
+	var v TypeError
+	return errors.As(err, &v) &&
+		e.Asserted == v.Asserted &&
+		e.Concrete == v.Concrete
+}
+
+// storeE is a convenience function to set the value of a result pointer.
+func storeE(rp any, r any) error {
+	pv := reflect.ValueOf(rp).Elem()
+	v := reflect.ValueOf(r)
+	pt, vt := pv.Type(), v.Type()
+	if !vt.AssignableTo(pt) {
+		return TypeError{vt, pt}
+	}
+	pv.Set(v)
+	return nil
+}
+
+// store is like storeE, but panics if error is non-nil.
+func store[T Value](rp any, r T) {
+	err := storeE(rp, r)
+	if err != nil {
+		panic(err)
+	}
+}
+
+// EvaluationError is an error and the expression it occurred in.
+type EvaluationError struct {
+	Expr any
+	Err  error
+}
+
+// Unwrap returns the underlying error.
+func (e EvaluationError) Unwrap() error { return e.Err }
+
+// Error returns a very long error description that should not be presented
+// to the user directly.
+func (e EvaluationError) Error() string {
+	return fmt.Sprintf("expression %#v: %v", e.Expr, e.Err)
+}
+
+// evaluateAny implements [Evaluate].
+func evaluateAny(s []Frame, expr, rp any) bool {
+	defer func() {
+		r := recover()
+		if r == nil {
+			return
+		}
+
+		err, ok := r.(error)
+		if !ok {
+			panic(r)
+		}
+
+		if _, ok = err.(EvaluationError); ok {
+			panic(err)
+		}
+		panic(EvaluationError{expr, err})
+	}()
+
+	switch e := expr.(type) {
+	case Int:
+		store(rp, int64(e))
+		return true
+
+	case String:
+		store(rp, string(e))
+		return true
+
+	case Ident:
+		var (
+			v  any
+			ok bool
+		)
+		for i := range s {
+			v, ok = s[len(s)-1-i].Val[unique.Make(e)]
+			if ok {
+				break
+			}
+		}
+		if !ok {
+			panic(UndefinedError(e))
+		}
+		if err := storeE(rp, v); err != nil {
+			panic(err)
+		}
+		return true
+
+	case Val:
+		if len(e) == 1 {
+			switch v := e[0].(type) {
+			case Ident:
+				switch v {
+				case "unset":
+					return false
+				case "true":
+					store(rp, true)
+					return true
+				case "false":
+					store(rp, false)
+					return true
+				default:
+					return evaluateAny(s, v, rp)
+				}
+
+			default:
+				return evaluateAny(s, e[0], rp)
+			}
+		}
+		var v string
+		for i := range e {
+			var _r string
+			if evaluate(s, e[i], &_r) {
+				v += _r
+			}
+		}
+		store(rp, v)
+		return true
+
+	case Array:
+		r := make([]string, 0, len(e))
+		for i := range e {
+			var _r string
+			if evaluate(s, e[i], &_r) {
+				r = append(r, _r)
+			}
+		}
+		store(rp, r)
+		return true
+
+	case []KV:
+		r := make([][2]string, 0, len(e))
+		for i := range e {
+			var _r string
+			if e[i].V == nil || evaluate(s, e[i].V, &_r) {
+				r = append(r, [2]string{string(e[i].K), _r})
+			}
+		}
+		store(rp, r)
+		return true
+
+	case Func:
+		var (
+			f  F
+			ok bool
+		)
+		for i := range s {
+			f, ok = s[len(s)-1-i].Func[unique.Make(e.Ident)]
+			if ok {
+				break
+			}
+		}
+		if !ok {
+			panic(UndefinedError(e.Ident))
+		}
+
+		argc := len(e.Args)
+		for _, arg := range e.Args {
+			argc += len(arg.K) - 1
+		}
+		fargs := make([]FArg, 0, len(e.Args))
+		s = append(s, Frame{Val: maps.Clone(f.V)})
+		fp := &s[len(s)-1]
+
+		for _, arg := range e.Args {
+			farg := FArg{R: arg.R}
+			if !evaluateAny(s, arg.V, &farg.V) {
+				farg.V = nil
+			}
+			for _, name := range arg.K {
+				h := unique.Make(name)
+				farg.K = h
+				fargs = append(fargs, farg)
+
+				if arg.R && farg.V != nil {
+					if fp.Val == nil {
+						fp.Val = make(map[unique.Handle[Ident]]any)
+					}
+					(*fp).Val[h] = farg.V
+				}
+			}
+		}
+
+		v, set, err := f.F(e.Package, fargs)
+		if err != nil {
+			panic(err)
+		} else if v != nil {
+			if err = storeE(rp, v); err != nil {
+				panic(err)
+			}
+		}
+		return set
+
+	default:
+		panic(UnsupportedExprError{expr})
+	}
+}
+
+// Evaluate evaluates a statement and returns its value.
+func Evaluate[T Value](s []Frame, expr any) (v T, set bool, err error) {
+	defer func() {
+		r := recover()
+		if r == nil {
+			return
+		}
+
+		_err, ok := r.(error)
+		if !ok {
+			panic(r)
+		}
+		err = _err
+	}()
+	set = evaluate[T](s, expr, &v)
+	return
+}

internal/rosa/azalea/evaluate_test.go

@@ -0,0 +1,358 @@
+package azalea_test
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"strings"
+	"testing"
+	"unique"
+
+	. "hakurei.app/internal/rosa/azalea"
+)
+
+// makeStackCheck creates a stack with a single frame with a single function "f"
+// which calls the check function internally.
+func makeStackCheck(check func(args FArgs) (any, error)) []Frame {
+	return []Frame{{Func: map[unique.Handle[Ident]]F{
+		unique.Make(Ident("f")): {F: func(
+			isPackage bool,
+			args FArgs,
+		) (v any, set bool, err error) {
+			set = true
+			v, err = check(args)
+			if isPackage {
+				err = errors.New("unexpected package")
+			}
+			return
+		}},
+	}}}
+}
+
+func TestEvaluate(t *testing.T) {
+	t.Parallel()
+
+	testCases := []struct {
+		name string
+		data string
+		s    []Frame
+		want string
+		err  error
+	}{
+		{"apply unset", `f { v = unset; }`, makeStackCheck(func(
+			args FArgs,
+		) (v any, err error) {
+			v = "\xfd"
+			err = args.Apply(map[unique.Handle[Ident]]any{
+				unique.Make(Ident("v")): &v,
+			})
+			return
+		}), "\xfd", nil},
+
+		{"apply bad type", `f { v = 9; }`, makeStackCheck(func(
+			args FArgs,
+		) (v any, err error) {
+			v = "\xfd"
+			err = args.Apply(map[unique.Handle[Ident]]any{
+				unique.Make(Ident("v")): &v,
+			})
+			return
+		}), "", TypeError{
+			Concrete: reflect.TypeFor[int64](),
+			Asserted: reflect.TypeFor[string](),
+		}},
+
+		{"apply undefined", `f { v = 9; }`, makeStackCheck(func(
+			args FArgs,
+		) (v any, err error) {
+			v = "\xfd"
+			err = args.Apply(map[unique.Handle[Ident]]any{})
+			return
+		}), "", EvaluationError{
+			Expr: Func{
+				Ident: Ident("f"),
+				Args: []Arg{
+					{K: []Ident{"v"}, V: Val{Int(9)}},
+				},
+			},
+			Err: UndefinedError("v"),
+		}},
+
+		{"apply bound undefined", `f { _v* = "\x00"; v = _v; }`, makeStackCheck(func(
+			args FArgs,
+		) (v any, err error) {
+			v = "\xfd"
+			err = args.Apply(map[unique.Handle[Ident]]any{
+				unique.Make(Ident("v")): &v,
+			})
+			return
+		}), "\x00", nil},
+
+		{"undefined function", `f {}`, nil, "", EvaluationError{
+			Expr: Func{Ident: "f"},
+			Err:  UndefinedError("f"),
+		}},
+
+		{"error wrap deep", `f { v = nil; }`, makeStackCheck(func(
+			FArgs,
+		) (any, error) {
+			panic("unreachable")
+		}), "", EvaluationError{
+			Expr: Ident("nil"),
+			Err:  UndefinedError("nil"),
+		}},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
+			var expr Func
+			if e, err := Parse(strings.NewReader(tc.data)); err != nil {
+				t.Fatal(err)
+			} else if len(e) != 1 {
+				t.Fatalf("got expression %#v", e)
+			} else {
+				expr = e[0].(Func)
+			}
+			r, set, err := Evaluate[string](tc.s, expr)
+			if set != (err == nil) {
+				t.Error("Evaluate: unexpected unset")
+			}
+
+			if r != tc.want {
+				t.Errorf("Evaluate: %q, want %q", r, tc.want)
+			}
+
+			var errEquals bool
+			if errors.As(err, new(TypeError)) {
+				errEquals = errors.Is(err, tc.err)
+			} else {
+				errEquals = reflect.DeepEqual(err, tc.err)
+			}
+			if !errEquals {
+				t.Errorf("Evaluate: error = %v, want %v", err, tc.err)
+			}
+		})
+	}
+}
+
+func TestEvaluateGCC(t *testing.T) {
+	t.Parallel()
+
+	var gcc Func
+	if e, err := Parse(strings.NewReader(sample)); err != nil {
+		t.Fatal(err)
+	} else {
+		gcc = e[0].(Func)
+	}
+
+	var got [3]FArgs
+	if r, set, err := Evaluate[string]([]Frame{{
+		Func: map[unique.Handle[Ident]]F{
+			unique.Make(Ident("gcc")): {F: func(
+				isPackage bool,
+				args FArgs,
+			) (v any, set bool, err error) {
+				v = "\x00"
+				if !isPackage {
+					err = errors.New("not a package")
+				}
+				set = true
+				got[0] = args
+				return
+			}, V: map[unique.Handle[Ident]]any{
+				unique.Make(Ident("binutils")):       "binutils",
+				unique.Make(Ident("mpc")):            "mpc",
+				unique.Make(Ident("zlib")):           "zlib",
+				unique.Make(Ident("libucontext")):    "libucontext",
+				unique.Make(Ident("kernel-headers")): "kernel-headers",
+			}},
+
+			unique.Make(Ident("remoteTar")): {F: func(
+				isPackage bool,
+				args FArgs,
+			) (v any, set bool, err error) {
+				if isPackage {
+					err = errors.New("unexpected package")
+					return
+				}
+
+				var url, checksum string
+				var compress int
+				if err = args.Apply(map[unique.Handle[Ident]]any{
+					unique.Make(Ident("url")):      &url,
+					unique.Make(Ident("checksum")): &checksum,
+					unique.Make(Ident("compress")): &compress,
+				}); err != nil {
+					return
+				}
+
+				if compress != 0xcafe {
+					err = fmt.Errorf("unexpected compress %#v", compress)
+				}
+				set = true
+				v = url + "?checksum=" + checksum
+				return
+			}, V: map[unique.Handle[Ident]]any{
+				unique.Make(Ident("gzip")): 0xcafe,
+			}},
+
+			unique.Make(Ident("make")): {F: func(
+				isPackage bool,
+				args FArgs,
+			) (v any, set bool, err error) {
+				v = args
+				if isPackage {
+					err = errors.New("unexpected package")
+				}
+				set = true
+				return
+			}},
+
+			unique.Make(Ident("arch")): {F: func(
+				isPackage bool,
+				args FArgs,
+			) (v any, set bool, err error) {
+				set = false
+				if isPackage {
+					err = errors.New("unexpected package")
+				}
+				got[1] = args
+				return
+			}},
+
+			unique.Make(Ident("noop")): {F: func(
+				isPackage bool,
+				args FArgs,
+			) (v any, set bool, err error) {
+				set = false
+				if isPackage {
+					err = errors.New("unexpected package")
+				}
+				set = true
+				got[2] = args
+				return
+			}, V: map[unique.Handle[Ident]]any{
+				unique.Make(Ident("value")): "\xfd",
+			}},
+		},
+	}}, gcc); err != nil {
+		t.Fatal(err)
+	} else if r != "\x00" {
+		t.Fatalf("package: %q", r)
+	} else if !set {
+		t.Fatal("package: unset")
+	}
+
+	want := [...]FArgs{
+		{
+			{K: unique.Make(Ident("description")), V: "The GNU Compiler Collection"},
+			{K: unique.Make(Ident("website")), V: "https://www.gnu.org/software/gcc"},
+			{K: unique.Make(Ident("anitya")), V: int64(6502)},
+
+			{K: unique.Make(Ident("version")), V: "16.1.0", R: true},
+			{K: unique.Make(Ident("source")), V: "https://ftp.tsukuba.wide.ad.jp/software/gcc/releases/gcc-16.1.0/gcc-16.1.0.tar.gz?checksum=4ASoWbxaA2FW7PAB0zzHDPC5XnNhyaAyjtDPpGzceSLeYnEIXsNYZR3PA_Zu5P0K"},
+			{K: unique.Make(Ident("patches")), V: []string{"musl-off64_t-loff_t.patch", "musl-legacy-lfs.patch"}},
+
+			{K: unique.Make(Ident("exclusive")), V: true},
+			{K: unique.Make(Ident("exec")), V: FArgs{
+				{K: unique.Make(Ident("configure")), V: [][2]string{
+					{"disable-multilib", ""},
+					{"enable-default-pie", ""},
+					{"disable-nls", ""},
+					{"with-gnu-as", ""},
+					{"with-gnu-ld", ""},
+					{"with-system-zlib", ""},
+					{"enable-languages", "c,c++,go"},
+					{"with-native-system-header-dir", "/system/include"},
+				}},
+				{K: unique.Make(Ident("make")), V: []string{
+					"BOOT_CFLAGS='-O2 -g'",
+					"\x00",
+					"bootstrap",
+				}},
+				{K: unique.Make(Ident("skip-check")), V: true},
+			}},
+
+			{K: unique.Make(Ident("inputs")), V: []string{
+				"binutils",
+				"mpc",
+				"zlib",
+				"libucontext",
+				"kernel-headers",
+			}},
+		},
+		{
+			{K: unique.Make(Ident("amd64")), V: "''"},
+			{K: unique.Make(Ident("arm64")), V: "''"},
+			{K: unique.Make(Ident("default"))},
+		},
+		{{K: unique.Make(Ident("key")), V: "\xfd"}},
+	}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("package: args = %#v, want %#v", got, want)
+	}
+}
+
+func BenchmarkEvaluate(b *testing.B) {
+	var gcc Func
+	if e, err := Parse(strings.NewReader(sample)); err != nil {
+		b.Fatal(err)
+	} else {
+		gcc = e[0].(Func)
+	}
+
+	s := []Frame{{
+		Func: map[unique.Handle[Ident]]F{
+			unique.Make(Ident("gcc")): {F: func(
+				bool,
+				FArgs,
+			) (v any, set bool, err error) {
+				return
+			}, V: map[unique.Handle[Ident]]any{
+				unique.Make(Ident("binutils")):       "binutils",
+				unique.Make(Ident("mpc")):            "mpc",
+				unique.Make(Ident("zlib")):           "zlib",
+				unique.Make(Ident("libucontext")):    "libucontext",
+				unique.Make(Ident("kernel-headers")): "kernel-headers",
+			}},
+
+			unique.Make(Ident("remoteTar")): {F: func(
+				bool,
+				FArgs,
+			) (v any, set bool, err error) {
+				return
+			}, V: map[unique.Handle[Ident]]any{
+				unique.Make(Ident("gzip")): 0xcafe,
+			}},
+
+			unique.Make(Ident("make")): {F: func(
+				bool,
+				FArgs,
+			) (v any, set bool, err error) {
+				return
+			}},
+
+			unique.Make(Ident("arch")): {F: func(
+				bool,
+				FArgs,
+			) (v any, set bool, err error) {
+				return
+			}},
+
+			unique.Make(Ident("noop")): {F: func(
+				bool,
+				FArgs,
+			) (v any, set bool, err error) {
+				return
+			}, V: map[unique.Handle[Ident]]any{
+				unique.Make(Ident("value")): "\xfd",
+			}},
+		},
+	}}
+	for b.Loop() {
+		if _, _, err := Evaluate[string](s, gcc); err != nil {
+			b.Fatal(err)
+		}
+	}
+}

internal/rosa/azalea/testdata/gcc.az

@@ -0,0 +1,57 @@
+package gcc {
+	description = "The GNU Compiler Collection";
+	website = "https://www.gnu.org/software/gcc";
+	anitya = 6502;
+
+	version* = "16.1.0";
+	source = remoteTar {
+		url = "https://ftp.tsukuba.wide.ad.jp/software/gcc/releases/"+
+			"gcc-"+version+"/gcc-"+version+".tar.gz";
+		checksum = "4ASoWbxaA2FW7PAB0zzHDPC5XnNhyaAyjtDPpGzceSLeYnEIXsNYZR3PA_Zu5P0K";
+		compress = gzip;
+	};
+	patches = [
+		"musl-off64_t-loff_t.patch",
+		"musl-legacy-lfs.patch",
+	];
+
+	// GCC spends most of its time in its many configure scripts, however
+	// it also saturates the CPU for a consequential amount of time.
+	exclusive = true;
+
+	exec = make {
+		configure = {
+			"disable-multilib";
+			"enable-default-pie";
+			"disable-nls";
+			"with-gnu-as";
+			"with-gnu-ld";
+			"with-system-zlib";
+			"enable-languages": "c,c++,go";
+			"with-native-system-header-dir": "/system/include";
+			"with-multilib-list": arch {
+				amd64, arm64 = "''";
+				default = unset;
+			};
+		};
+		make = [
+			"BOOT_CFLAGS='-O2 -g'",
+			noop { key = value; } + "\x00",
+			"bootstrap",
+		];
+
+		// This toolchain is hacked to pieces, it is not expected to ever work
+		// well in its current state. That does not matter as long as the
+		// toolchain it produces passes its own test suite.
+		skip-check = true;
+	};
+
+	inputs = [
+		binutils,
+
+		mpc,
+		zlib,
+		libucontext,
+		kernel-headers,
+	];
+}

internal/rosa/busybox.go

@@ -5,7 +5,6 @@ import (
 	"io"
 	"net/http"
 	"os"
-	"runtime"
 	"time"
 
 	"hakurei.app/fhs"
@@ -86,13 +85,13 @@ func (a busyboxBin) Cure(t *pkg.TContext) (err error) {
 
 // newBusyboxBin returns a [pkg.Artifact] containing a busybox installation from
 // the https://busybox.net/downloads/binaries/ binary release.
-func newBusyboxBin() pkg.Artifact {
+func (s *S) newBusyboxBin() pkg.Artifact {
 	var version, url, checksum string
-	switch runtime.GOARCH {
+	switch s.arch {
 	case "amd64":
 		version = "1.35.0"
 		url = "https://busybox.net/downloads/binaries/" +
-			version + "-" + linuxArch() + "-linux-musl/busybox"
+			version + "-" + s.linuxArch() + "-linux-musl/busybox"
 		checksum = "L7OBIsPu9enNHn7FqpBT1kOg_mCLNmetSeNMA3i4Y60Z5jTgnlX3qX3zcQtLx5AB"
 	case "arm64":
 		version = "1.31.0"
@@ -101,11 +100,11 @@ func newBusyboxBin() pkg.Artifact {
 		checksum = "npJjBO7iwhjW6Kx2aXeSxf8kXhVgTCDChOZTTsI8ZfFfa3tbsklxRiidZQdrVERg"
 
 	default:
-		panic("unsupported target " + runtime.GOARCH)
+		panic("unsupported target " + s.arch)
 	}
 
 	return pkg.NewExec(
-		"busybox-bin-"+version, nil, pkg.ExecTimeoutMax, false,
+		"busybox-bin-"+version, s.arch, nil, pkg.ExecTimeoutMax, false, false,
 		fhs.AbsRoot, []string{
 			"PATH=/system/bin",
 		},

internal/rosa/bzip2.go

@@ -26,7 +26,7 @@ func (t Toolchain) newBzip2() (pkg.Artifact, string) {
 	}), version
 }
 func init() {
-	artifactsM[Bzip2] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newBzip2,
 
 		Name:        "bzip2",
@@ -34,5 +34,5 @@ func init() {
 		Website:     "https://sourceware.org/bzip2/",
 
 		ID: 237,
-	}
+	})
 }

internal/rosa/cmake.go

@@ -106,7 +106,7 @@ index 2ead810437..f85cbb8b1c 100644
 	), version
 }
 func init() {
-	artifactsM[CMake] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newCMake,
 
 		Name:        "cmake",
@@ -114,7 +114,7 @@ func init() {
 		Website:     "https://cmake.org/",
 
 		ID: 306,
-	}
+	})
 }
 
 // CMakeHelper is the [CMake] build system helper.
@@ -164,7 +164,7 @@ func (*CMakeHelper) createDir() bool { return true }
 func (*CMakeHelper) wantsDir() string { return "/cure/" }
 
 // script generates the cure script.
-func (attr *CMakeHelper) script(name string) string {
+func (attr *CMakeHelper) script(s *S, name string) string {
 	if attr == nil {
 		attr = new(CMakeHelper)
 	}
@@ -180,7 +180,7 @@ func (attr *CMakeHelper) script(name string) string {
 	}
 
 	script := attr.Script
-	if !attr.SkipTest && presetOpts&OptSkipCheck == 0 {
+	if !attr.SkipTest && s.opts&OptSkipCheck == 0 {
 		script += "\n" + test
 	}
 

internal/rosa/connman.go

@@ -90,7 +90,7 @@ func (t Toolchain) newConnman() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Connman] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newConnman,
 
 		Name:        "connman",
@@ -105,5 +105,5 @@ func init() {
 		},
 
 		ID: 337,
-	}
+	})
 }

internal/rosa/curl.go

@@ -4,8 +4,8 @@ import "hakurei.app/internal/pkg"
 
 func (t Toolchain) newCurl() (pkg.Artifact, string) {
 	const (
-		version  = "8.19.0"
+		version  = "8.20.0"
-		checksum = "YHuVLVVp8q_Y7-JWpID5ReNjq2Zk6t7ArHB6ngQXilp_R5l3cubdxu3UKo-xDByv"
+		checksum = "xyHXwrngIRGMasuzhn-I5MSCOhktwINbsWt1f_LuR-5jRVvyx_g6U1EQfDLEbr9r"
 	)
 	return t.NewPackage("curl", version, newTar(
 		"https://curl.se/download/curl-"+version+".tar.bz2",
@@ -39,7 +39,7 @@ chmod +w tests/data && rm -f tests/data/test459
 	), version
 }
 func init() {
-	artifactsM[Curl] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newCurl,
 
 		Name:        "curl",
@@ -52,5 +52,5 @@ func init() {
 		},
 
 		ID: 381,
-	}
+	})
 }

internal/rosa/dbus.go

@@ -29,7 +29,7 @@ func (t Toolchain) newDBus() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[DBus] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newDBus,
 
 		Name:        "dbus",
@@ -42,7 +42,7 @@ func init() {
 		},
 
 		ID: 5356,
-	}
+	})
 }
 
 func (t Toolchain) newXDGDBusProxy() (pkg.Artifact, string) {
@@ -65,7 +65,7 @@ func (t Toolchain) newXDGDBusProxy() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[XDGDBusProxy] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newXDGDBusProxy,
 
 		Name:        "xdg-dbus-proxy",
@@ -77,5 +77,5 @@ func init() {
 		},
 
 		ID: 58434,
-	}
+	})
 }

internal/rosa/dtc.go

@@ -31,7 +31,7 @@ func (t Toolchain) newDTC() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[DTC] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newDTC,
 
 		Name:        "dtc",
@@ -39,5 +39,5 @@ func init() {
 		Website:     "https://git.kernel.org/pub/scm/utils/dtc/dtc.git/",
 
 		ID: 16911,
-	}
+	})
 }

internal/rosa/elfutils.go

@@ -39,7 +39,7 @@ func (t Toolchain) newElfutils() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Elfutils] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newElfutils,
 
 		Name:        "elfutils",
@@ -55,5 +55,5 @@ func init() {
 		},
 
 		ID: 5679,
-	}
+	})
 }

internal/rosa/fakeroot.go

@@ -46,7 +46,7 @@ index f135ad9..85c784c 100644
 	), version
 }
 func init() {
-	artifactsM[Fakeroot] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newFakeroot,
 
 		Name:        "fakeroot",
@@ -54,5 +54,5 @@ func init() {
 		Website:     "https://salsa.debian.org/clint/fakeroot",
 
 		ID: 12048,
-	}
+	})
 }

internal/rosa/flex.go

@@ -20,7 +20,7 @@ func (t Toolchain) newFlex() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Flex] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newFlex,
 
 		Name:        "flex",
@@ -28,5 +28,5 @@ func init() {
 		Website:     "https://github.com/westes/flex/",
 
 		ID: 819,
-	}
+	})
 }

internal/rosa/freetype.go

@@ -0,0 +1,27 @@
+package rosa
+
+import "hakurei.app/internal/pkg"
+
+func (t Toolchain) newFreetype() (pkg.Artifact, string) {
+	const (
+		version  = "2.14.3"
+		checksum = "-WfLv8fVJNyCHpP_lriiDzOcVbBL9ajdQ3tl8AzIIUa9-8sVpU9irxOmSMgRHWYz"
+	)
+	return t.NewPackage("freetype", version, newTar(
+		"https://download.savannah.gnu.org/releases/freetype/"+
+			"freetype-"+version+".tar.gz",
+		checksum,
+		pkg.TarGzip,
+	), nil, (*MakeHelper)(nil)), version
+}
+func init() {
+	native.MustRegister(&Artifact{
+		f: Toolchain.newFreetype,
+
+		Name:        "freetype",
+		Description: "a freely available software library to render fonts",
+		Website:     "http://www.freetype.org/",
+
+		ID: 854,
+	})
+}

internal/rosa/fuse.go

@@ -31,7 +31,7 @@ func (t Toolchain) newFuse() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Fuse] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newFuse,
 
 		Name:        "fuse",
@@ -39,5 +39,5 @@ func init() {
 		Website:     "https://github.com/libfuse/libfuse/",
 
 		ID: 861,
-	}
+	})
 }

internal/rosa/git.go

@@ -55,6 +55,14 @@ disable_test t9300-fast-import
 disable_test t0211-trace2-perf
 disable_test t1517-outside-repo
 disable_test t2200-add-update
+disable_test t0027-auto-crlf
+disable_test t7513-interpret-trailers
+disable_test t7703-repack-geometric
+disable_test t7002-mv-sparse-checkout
+disable_test t1451-fsck-buffer
+disable_test t4104-apply-boundary
+disable_test t4200-rerere
+disable_test t5515-fetch-merge-logic
 `,
 		Check: []string{
 			"-C t",
@@ -80,7 +88,7 @@ disable_test t2200-add-update
 	), version
 }
 func init() {
-	artifactsM[Git] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGit,
 
 		Name:        "git",
@@ -94,7 +102,7 @@ func init() {
 		},
 
 		ID: 5350,
-	}
+	})
 }
 
 // NewViaGit returns a [pkg.Artifact] for cloning a git repository.
@@ -105,7 +113,7 @@ func (t Toolchain) NewViaGit(
 	return t.New(strings.TrimSuffix(
 		path.Base(url),
 		".git",
-	)+"-src-"+path.Base(rev), 0, t.AppendPresets(nil,
+	)+"-src-"+path.Base(rev), THostNet, t.Append(nil,
 		NSSCACert,
 		Git,
 	), &checksum, nil, `

internal/rosa/glslang.go

@@ -22,7 +22,7 @@ func (t Toolchain) newSPIRVHeaders() (pkg.Artifact, string) {
 	}), version
 }
 func init() {
-	artifactsM[SPIRVHeaders] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newSPIRVHeaders,
 
 		Name:        "spirv-headers",
@@ -49,7 +49,7 @@ func init() {
 			}
 			return v.Latest
 		},
-	}
+	})
 }
 
 func (t Toolchain) newSPIRVTools() (pkg.Artifact, string) {
@@ -72,7 +72,7 @@ func (t Toolchain) newSPIRVTools() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[SPIRVTools] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newSPIRVTools,
 
 		Name:        "spirv-tools",
@@ -86,13 +86,13 @@ func init() {
 		ID: 14894,
 
 		latest: (*Versions).getStable,
-	}
+	})
 }
 
 func (t Toolchain) newGlslang() (pkg.Artifact, string) {
 	const (
-		version  = "16.2.0"
+		version  = "16.3.0"
-		checksum = "6_UuF9reLRDaVkgO-9IfB3kMwme3lQZM8LL8YsJwPdUFkrjzxJtf2A9X3w9nFxj2"
+		checksum = "xyqDf8k3-D0_BXHGi0uLgMglnJ05Rf3j73QgbDs3sGtKNdBIQhY8JfqX1NcNoJQN"
 	)
 	return t.NewPackage("glslang", version, newFromGitHub(
 		"KhronosGroup/glslang",
@@ -116,7 +116,7 @@ func (t Toolchain) newGlslang() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Glslang] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGlslang,
 
 		Name:        "glslang",
@@ -124,7 +124,7 @@ func init() {
 		Website:     "https://github.com/KhronosGroup/glslang",
 
 		ID: 205796,
-	}
+	})
 }
 
 func (t Toolchain) newSPIRVLLVMTranslator() (pkg.Artifact, string) {
@@ -132,15 +132,75 @@ func (t Toolchain) newSPIRVLLVMTranslator() (pkg.Artifact, string) {
 		version  = "22.1.2"
 		checksum = "JZAaV5ewYcm-35YA_U2BM2IcsQouZtX1BLZR0zh2vSlfEXMsT5OCtY4Gh5RJkcGy"
 	)
+	skipChecks := []string{
+		// error: line 13: OpTypeCooperativeMatrixKHR Scope is limited to Workgroup and Subgroup
+		"cooperative_matrix_constant_null.spvasm",
+	}
+
+	switch t.arch {
+	case "arm64":
+		skipChecks = append(skipChecks,
+			// LLVM ERROR: unsupported calling convention
+			"DebugInfo/COFF/no-cus.ll",
+			"DebugInfo/Generic/2009-11-05-DeadGlobalVariable.ll",
+			"DebugInfo/Generic/2009-11-10-CurrentFn.ll",
+			"DebugInfo/Generic/2010-01-05-DbgScope.ll",
+			"DebugInfo/Generic/2010-03-12-llc-crash.ll",
+			"DebugInfo/Generic/2010-03-24-MemberFn.ll",
+			"DebugInfo/Generic/2010-04-19-FramePtr.ll",
+			"DebugInfo/Generic/2010-06-29-InlinedFnLocalVar.ll",
+			"DebugInfo/Generic/2010-10-01-crash.ll",
+			"DebugInfo/Generic/PR20038.ll",
+			"DebugInfo/Generic/constant-pointers.ll",
+			"DebugInfo/Generic/dead-argument-order.ll",
+			"DebugInfo/Generic/debug-info-eis-option.ll",
+			"DebugInfo/Generic/def-line.ll",
+			"DebugInfo/Generic/discriminator.ll",
+			"DebugInfo/Generic/dwarf-public-names.ll",
+			"DebugInfo/Generic/enum.ll",
+			"DebugInfo/Generic/func-using-decl.ll",
+			"DebugInfo/Generic/global.ll",
+			"DebugInfo/Generic/imported-name-inlined.ll",
+			"DebugInfo/Generic/incorrect-variable-debugloc1.ll",
+			"DebugInfo/Generic/inline-scopes.ll",
+			"DebugInfo/Generic/inlined-arguments.ll",
+			"DebugInfo/Generic/inlined-vars.ll",
+			"DebugInfo/Generic/linear-dbg-value.ll",
+			"DebugInfo/Generic/linkage-name-abstract.ll",
+			"DebugInfo/Generic/member-order.ll",
+			"DebugInfo/Generic/missing-abstract-variable.ll",
+			"DebugInfo/Generic/multiline.ll",
+			"DebugInfo/Generic/namespace_function_definition.ll",
+			"DebugInfo/Generic/namespace_inline_function_definition.ll",
+			"DebugInfo/Generic/noscopes.ll",
+			"DebugInfo/Generic/ptrsize.ll",
+			"DebugInfo/Generic/restrict.ll",
+			"DebugInfo/Generic/two-cus-from-same-file.ll",
+			"DebugInfo/Generic/version.ll",
+			"DebugInfo/LocalAddressSpace.ll",
+			"DebugInfo/UnknownBaseType.ll",
+			"DebugInfo/expr-opcode.ll",
+		)
+	}
+
 	return t.NewPackage("spirv-llvm-translator", version, newFromGitHub(
 		"KhronosGroup/SPIRV-LLVM-Translator",
 		"v"+version, checksum,
 	), &PackageAttr{
 		Patches: []KV{
 			{"remove-early-prefix", `diff --git a/CMakeLists.txt b/CMakeLists.txt
-index c000a77e..86f79b03 100644
+index c000a77e..f18f3fde 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
+@@ -164,7 +164,7 @@ install(
+     ${LLVM_SPIRV_INCLUDE_DIRS}/LLVMSPIRVOpts.h
+     ${LLVM_SPIRV_INCLUDE_DIRS}/LLVMSPIRVExtensions.inc
+   DESTINATION
+-    ${CMAKE_INSTALL_PREFIX}/include/LLVMSPIRVLib
++    include/LLVMSPIRVLib
+ )
+ 
+ configure_file(LLVMSPIRVLib.pc.in ${CMAKE_BINARY_DIR}/LLVMSPIRVLib.pc @ONLY)
 @@ -172,5 +172,5 @@ install(
    FILES
      ${CMAKE_BINARY_DIR}/LLVMSPIRVLib.pc
@@ -148,14 +208,12 @@ index c000a77e..86f79b03 100644
 -    ${CMAKE_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}/pkgconfig
 +    lib${LLVM_LIBDIR_SUFFIX}/pkgconfig
  )
-`},
+;`},
 		},
 
 		// litArgs emits shell syntax
 		ScriptEarly: `
-export LIT_OPTS=` + litArgs(true,
+export LIT_OPTS=` + litArgs(true, skipChecks...) + `
-			// error: line 13: OpTypeCooperativeMatrixKHR Scope is limited to Workgroup and Subgroup
-			"cooperative_matrix_constant_null.spvasm") + `
 `,
 	}, &CMakeHelper{
 		Cache: []KV{
@@ -174,7 +232,7 @@ export LIT_OPTS=` + litArgs(true,
 	), version
 }
 func init() {
-	artifactsM[SPIRVLLVMTranslator] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newSPIRVLLVMTranslator,
 
 		Name:        "spirv-llvm-translator",
@@ -186,5 +244,5 @@ func init() {
 		},
 
 		ID: 227273,
-	}
+	})
 }

internal/rosa/gnu.go

@@ -1,7 +1,6 @@
 package rosa
 
 import (
-	"runtime"
 	"slices"
 	"strconv"
 	"strings"
@@ -64,7 +63,7 @@ chmod +w tests/test-c32ispunct.sh && echo '#!/bin/sh' > tests/test-c32ispunct.sh
 	), version
 }
 func init() {
-	artifactsM[M4] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newM4,
 
 		Name:        "m4",
@@ -72,7 +71,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/m4/",
 
 		ID: 1871,
-	}
+	})
 }
 
 func (t Toolchain) newBison() (pkg.Artifact, string) {
@@ -99,7 +98,7 @@ func (t Toolchain) newBison() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Bison] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newBison,
 
 		Name:        "bison",
@@ -107,7 +106,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/bison/",
 
 		ID: 193,
-	}
+	})
 }
 
 func (t Toolchain) newSed() (pkg.Artifact, string) {
@@ -126,7 +125,7 @@ func (t Toolchain) newSed() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Sed] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newSed,
 
 		Name:        "sed",
@@ -134,7 +133,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/sed/",
 
 		ID: 4789,
-	}
+	})
 }
 
 func (t Toolchain) newAutoconf() (pkg.Artifact, string) {
@@ -161,7 +160,7 @@ func (t Toolchain) newAutoconf() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Autoconf] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newAutoconf,
 
 		Name:        "autoconf",
@@ -174,7 +173,7 @@ func init() {
 		},
 
 		ID: 141,
-	}
+	})
 }
 
 func (t Toolchain) newAutomake() (pkg.Artifact, string) {
@@ -206,7 +205,7 @@ test_disable '#!/bin/sh' t/pr9.sh
 	), version
 }
 func init() {
-	artifactsM[Automake] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newAutomake,
 
 		Name:        "automake",
@@ -218,7 +217,7 @@ func init() {
 		},
 
 		ID: 144,
-	}
+	})
 }
 
 func (t Toolchain) newLibtool() (pkg.Artifact, string) {
@@ -232,7 +231,7 @@ func (t Toolchain) newLibtool() (pkg.Artifact, string) {
 		pkg.TarGzip,
 	), nil, &MakeHelper{
 		// _Z2a2c: symbol not found
-		SkipCheck: t.isStage0(),
+		SkipCheck: t.stage.isStage0(),
 
 		Check: []string{
 			"TESTSUITEFLAGS=" + jobsFlagE,
@@ -244,7 +243,7 @@ func (t Toolchain) newLibtool() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Libtool] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibtool,
 
 		Name:        "libtool",
@@ -252,7 +251,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/libtool/",
 
 		ID: 1741,
-	}
+	})
 }
 
 func (t Toolchain) newGzip() (pkg.Artifact, string) {
@@ -270,7 +269,7 @@ func (t Toolchain) newGzip() (pkg.Artifact, string) {
 	}), version
 }
 func init() {
-	artifactsM[Gzip] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGzip,
 
 		Name:        "gzip",
@@ -278,7 +277,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/gzip/",
 
 		ID: 1290,
-	}
+	})
 }
 
 func (t Toolchain) newGettext() (pkg.Artifact, string) {
@@ -316,7 +315,7 @@ touch gettext-tools/autotools/archive.dir.tar
 	), version
 }
 func init() {
-	artifactsM[Gettext] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGettext,
 
 		Name:        "gettext",
@@ -324,7 +323,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/gettext/",
 
 		ID: 898,
-	}
+	})
 }
 
 func (t Toolchain) newDiffutils() (pkg.Artifact, string) {
@@ -349,7 +348,7 @@ test_disable '#!/bin/sh' tests/cmp
 	}, (*MakeHelper)(nil)), version
 }
 func init() {
-	artifactsM[Diffutils] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newDiffutils,
 
 		Name:        "diffutils",
@@ -357,7 +356,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/diffutils/",
 
 		ID: 436,
-	}
+	})
 }
 
 func (t Toolchain) newPatch() (pkg.Artifact, string) {
@@ -381,7 +380,7 @@ test_disable '#!/bin/sh' tests/need-filename
 	}, (*MakeHelper)(nil)), version
 }
 func init() {
-	artifactsM[Patch] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newPatch,
 
 		Name:        "patch",
@@ -389,7 +388,7 @@ func init() {
 		Website:     "https://savannah.gnu.org/projects/patch/",
 
 		ID: 2597,
-	}
+	})
 }
 
 func (t Toolchain) newBash() (pkg.Artifact, string) {
@@ -411,7 +410,7 @@ func (t Toolchain) newBash() (pkg.Artifact, string) {
 	}), version
 }
 func init() {
-	artifactsM[Bash] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newBash,
 
 		Name:        "bash",
@@ -419,7 +418,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/bash/",
 
 		ID: 166,
-	}
+	})
 }
 
 func (t Toolchain) newCoreutils() (pkg.Artifact, string) {
@@ -457,7 +456,7 @@ test_disable 'int main(){return 0;}' gnulib-tests/test-lchown.c
 	), version
 }
 func init() {
-	artifactsM[Coreutils] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newCoreutils,
 
 		Name:        "coreutils",
@@ -465,7 +464,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/coreutils/",
 
 		ID: 343,
-	}
+	})
 }
 
 func (t Toolchain) newTexinfo() (pkg.Artifact, string) {
@@ -485,7 +484,7 @@ func (t Toolchain) newTexinfo() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Texinfo] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newTexinfo,
 
 		Name:        "texinfo",
@@ -498,7 +497,7 @@ func init() {
 		},
 
 		ID: 4958,
-	}
+	})
 }
 
 func (t Toolchain) newGperf() (pkg.Artifact, string) {
@@ -515,7 +514,7 @@ func (t Toolchain) newGperf() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Gperf] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGperf,
 
 		Name:        "gperf",
@@ -523,7 +522,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/gperf/",
 
 		ID: 1237,
-	}
+	})
 }
 
 func (t Toolchain) newGawk() (pkg.Artifact, string) {
@@ -543,7 +542,7 @@ func (t Toolchain) newGawk() (pkg.Artifact, string) {
 	}), version
 }
 func init() {
-	artifactsM[Gawk] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGawk,
 
 		Name:        "gawk",
@@ -551,7 +550,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/gawk/",
 
 		ID: 868,
-	}
+	})
 }
 
 func (t Toolchain) newGrep() (pkg.Artifact, string) {
@@ -576,7 +575,7 @@ test_disable 'int main(){return 0;}' gnulib-tests/test-c32ispunct.c
 	), version
 }
 func init() {
-	artifactsM[Grep] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGrep,
 
 		Name:        "grep",
@@ -584,7 +583,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/grep/",
 
 		ID: 1251,
-	}
+	})
 }
 
 func (t Toolchain) newFindutils() (pkg.Artifact, string) {
@@ -607,7 +606,7 @@ echo 'int main(){return 0;}' > tests/xargs/test-sigusr.c
 	), version
 }
 func init() {
-	artifactsM[Findutils] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newFindutils,
 
 		Name:        "findutils",
@@ -615,7 +614,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/findutils/",
 
 		ID: 812,
-	}
+	})
 }
 
 func (t Toolchain) newBC() (pkg.Artifact, string) {
@@ -636,7 +635,7 @@ func (t Toolchain) newBC() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[BC] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newBC,
 
 		Name:        "bc",
@@ -644,7 +643,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/bc/",
 
 		ID: 170,
-	}
+	})
 }
 
 func (t Toolchain) newLibiconv() (pkg.Artifact, string) {
@@ -659,7 +658,7 @@ func (t Toolchain) newLibiconv() (pkg.Artifact, string) {
 	), nil, (*MakeHelper)(nil)), version
 }
 func init() {
-	artifactsM[Libiconv] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibiconv,
 
 		Name:        "libiconv",
@@ -667,7 +666,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/libiconv/",
 
 		ID: 10656,
-	}
+	})
 }
 
 func (t Toolchain) newTar() (pkg.Artifact, string) {
@@ -701,7 +700,7 @@ func (t Toolchain) newTar() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Tar] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newTar,
 
 		Name:        "tar",
@@ -709,7 +708,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/tar/",
 
 		ID: 4939,
-	}
+	})
 }
 
 func (t Toolchain) newParallel() (pkg.Artifact, string) {
@@ -731,7 +730,7 @@ ln -s ../system/bin/bash /bin/
 	), version
 }
 func init() {
-	artifactsM[Parallel] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newParallel,
 
 		Name:        "parallel",
@@ -743,7 +742,7 @@ func init() {
 		},
 
 		ID: 5448,
-	}
+	})
 }
 
 func (t Toolchain) newLibunistring() (pkg.Artifact, string) {
@@ -768,7 +767,7 @@ test_disable 'int main(){return 0;}' tests/test-c32ispunct.c
 	), version
 }
 func init() {
-	artifactsM[Libunistring] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibunistring,
 
 		Name:        "libunistring",
@@ -776,7 +775,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/libunistring/",
 
 		ID: 1747,
-	}
+	})
 }
 
 func (t Toolchain) newLibtasn1() (pkg.Artifact, string) {
@@ -791,7 +790,7 @@ func (t Toolchain) newLibtasn1() (pkg.Artifact, string) {
 	), nil, (*MakeHelper)(nil)), version
 }
 func init() {
-	artifactsM[Libtasn1] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibtasn1,
 
 		Name:        "libtasn1",
@@ -799,7 +798,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/libtasn1/",
 
 		ID: 1734,
-	}
+	})
 }
 
 func (t Toolchain) newReadline() (pkg.Artifact, string) {
@@ -821,7 +820,7 @@ func (t Toolchain) newReadline() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Readline] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newReadline,
 
 		Name:        "readline",
@@ -833,7 +832,7 @@ func init() {
 		},
 
 		ID: 4173,
-	}
+	})
 }
 
 func (t Toolchain) newGnuTLS() (pkg.Artifact, string) {
@@ -843,7 +842,7 @@ func (t Toolchain) newGnuTLS() (pkg.Artifact, string) {
 	)
 
 	var configureExtra []KV
-	switch runtime.GOARCH {
+	switch t.arch {
 	case "arm64":
 		configureExtra = []KV{
 			{"disable-hardware-acceleration"},
@@ -998,7 +997,7 @@ index 1b78b8cf1..350156a86 100644
 	), version
 }
 func init() {
-	artifactsM[GnuTLS] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGnuTLS,
 
 		Name:        "gnutls",
@@ -1014,7 +1013,7 @@ func init() {
 		},
 
 		ID: 1221,
-	}
+	})
 }
 
 func (t Toolchain) newBinutils() (pkg.Artifact, string) {
@@ -1031,7 +1030,7 @@ func (t Toolchain) newBinutils() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Binutils] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newBinutils,
 
 		Name:        "binutils",
@@ -1039,7 +1038,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/binutils/",
 
 		ID: 7981,
-	}
+	})
 }
 
 func (t Toolchain) newGMP() (pkg.Artifact, string) {
@@ -1061,7 +1060,7 @@ func (t Toolchain) newGMP() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[GMP] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGMP,
 
 		Name:        "gmp",
@@ -1069,7 +1068,7 @@ func init() {
 		Website:     "https://gmplib.org/",
 
 		ID: 1186,
-	}
+	})
 }
 
 func (t Toolchain) newMPFR() (pkg.Artifact, string) {
@@ -1087,7 +1086,7 @@ func (t Toolchain) newMPFR() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[MPFR] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newMPFR,
 
 		Name:        "mpfr",
@@ -1099,7 +1098,7 @@ func init() {
 		},
 
 		ID: 2019,
-	}
+	})
 }
 
 func (t Toolchain) newMPC() (pkg.Artifact, string) {
@@ -1126,7 +1125,7 @@ func (t Toolchain) newMPC() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[MPC] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newMPC,
 
 		Name:        "mpc",
@@ -1138,17 +1137,17 @@ func init() {
 		},
 
 		ID: 1667,
-	}
+	})
 }
 
 func (t Toolchain) newGCC() (pkg.Artifact, string) {
 	const (
-		version  = "15.2.0"
+		version  = "16.1.0"
-		checksum = "TXJ5WrbXlGLzy1swghQTr4qxgDCyIZFgJry51XEPTBZ8QYbVmFeB4lZbSMtPJ-a1"
+		checksum = "4ASoWbxaA2FW7PAB0zzHDPC5XnNhyaAyjtDPpGzceSLeYnEIXsNYZR3PA_Zu5P0K"
 	)
 
 	var configureExtra []KV
-	switch runtime.GOARCH {
+	switch t.arch {
 	case "amd64", "arm64":
 		configureExtra = append(configureExtra, KV{"with-multilib-list", "''"})
 	}
@@ -1347,7 +1346,7 @@ ln -s system/lib /work/
 	), version
 }
 func init() {
-	artifactsM[gcc] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGCC,
 
 		Name:        "gcc",
@@ -1363,5 +1362,5 @@ func init() {
 		},
 
 		ID: 6502,
-	}
+	})
 }

internal/rosa/go.go

@@ -1,7 +1,6 @@
 package rosa
 
 import (
-	"runtime"
 	"slices"
 
 	"hakurei.app/internal/pkg"
@@ -10,7 +9,7 @@ import (
 // newGoBootstrap returns the Go bootstrap toolchain.
 func (t Toolchain) newGoBootstrap() pkg.Artifact {
 	const checksum = "8o9JL_ToiQKadCTb04nvBDkp8O1xiWOolAxVEqaTGodieNe4lOFEjlOxN3bwwe23"
-	return t.New("go1.4-bootstrap", 0, t.AppendPresets(nil,
+	return t.New("go1.4-bootstrap", 0, t.Append(nil,
 		Bash,
 	), nil, []string{
 		"CGO_ENABLED=0",
@@ -35,7 +34,11 @@ func (t Toolchain) newGo(
 	script string,
 	extra ...pkg.Artifact,
 ) pkg.Artifact {
-	return t.New("go"+version, 0, t.AppendPresets(extra,
+	name := "all"
+	if t.opts&OptSkipCheck != 0 {
+		name = "make"
+	}
+	return t.New("go"+version, 0, t.Append(extra,
 		Bash,
 	), nil, slices.Concat([]string{
 		"CC=cc",
@@ -48,7 +51,7 @@ cp -r /usr/src/go /work/system
 cd /work/system/go/src
 chmod -R +w ..
 `+script+`
-./all.bash
+./`+name+`.bash
 
 mkdir /work/system/bin
 ln -s \
@@ -69,17 +72,17 @@ func (t Toolchain) newGoLatest() (pkg.Artifact, string) {
 
 		finalEnv []string
 	)
-	switch runtime.GOARCH {
+	switch t.arch {
 	case "amd64":
 		bootstrapExtra = append(bootstrapExtra, t.newGoBootstrap())
 
 	case "arm64", "riscv64":
 		bootstrapEnv = append(bootstrapEnv, "GOROOT_BOOTSTRAP=/system")
-		bootstrapExtra = t.AppendPresets(bootstrapExtra, gcc)
+		bootstrapExtra = t.Append(bootstrapExtra, gcc)
 		finalEnv = append(finalEnv, "CGO_ENABLED=0")
 
 	default:
-		panic("unsupported target " + runtime.GOARCH)
+		panic("unsupported target " + t.arch)
 	}
 
 	go119 := t.newGo(
@@ -103,8 +106,8 @@ echo \
 		"YtrDka402BOAEwywx03Vz4QlVwoBiguJHzG7PuythMCPHXS8CVMLvzmvgEbu4Tzu",
 		[]string{"CGO_ENABLED=0"}, `
 sed -i \
-	's,/lib/ld-musl-`+linuxArch()+`.so.1,/system/bin/linker,' \
+	's,/lib/ld-musl-`+t.linuxArch()+`.so.1,/system/bin/linker,' \
-	cmd/link/internal/`+runtime.GOARCH+`/obj.go
+	cmd/link/internal/`+t.arch+`/obj.go
 
 rm \
 	crypto/tls/handshake_client_test.go \
@@ -121,18 +124,18 @@ echo \
 		"wcI32bl1tkqbgcelGtGWPI4RtlEddd-PTd76Eb-k7nXA5LbE9yTNdIL9QSOOxMOs",
 		[]string{"CGO_ENABLED=0"}, `
 sed -i \
-	's,/lib/ld-musl-`+linuxArch()+`.so.1,/system/bin/linker,' \
+	's,/lib/ld-musl-`+t.linuxArch()+`.so.1,/system/bin/linker,' \
-	cmd/link/internal/`+runtime.GOARCH+`/obj.go
+	cmd/link/internal/`+t.arch+`/obj.go
 `, go121,
 	)
 
 	go125 := t.newGo(
-		"1.25.9",
+		"1.25.10",
-		"gShJb9uOMk5AxqPSwvn53ZO56S6PyP6nfojzrHUiJ3krAvrgjJpYa6-DPA-jxbpN",
+		"TwKwatkpwal-j9U2sDSRPEdM3YesI4Gm88YgGV59wtU-L85K9gA7UPy9SCxn6PMb",
 		[]string{"CGO_ENABLED=0"}, `
 sed -i \
-	's,/lib/ld-musl-`+linuxArch()+`.so.1,/system/bin/linker,' \
+	's,/lib/ld-musl-`+t.linuxArch()+`.so.1,/system/bin/linker,' \
-	cmd/link/internal/`+runtime.GOARCH+`/obj.go
+	cmd/link/internal/`+t.arch+`/obj.go
 
 rm \
 	os/root_unix_test.go \
@@ -141,16 +144,16 @@ rm \
 	)
 
 	const (
-		version  = "1.26.2"
+		version  = "1.26.3"
-		checksum = "v-6BE89_1g3xYf-9oIYpJKFXlo3xKHYJj2_VGkaUq8ZVkIVQmLwrto-xGG03OISH"
+		checksum = "lEiFocZFnN5fKvZzmwVdqc9pYUjAuhzqZGbuiOqxUP4XdcY8yECisKcqsQ_eNn1N"
 	)
 	return t.newGo(
 		version,
 		checksum,
 		finalEnv, `
 sed -i \
-	's,/lib/ld-musl-`+linuxArch()+`.so.1,/system/bin/linker,' \
+	's,/lib/ld-musl-`+t.linuxArch()+`.so.1,/system/bin/linker,' \
-	cmd/link/internal/`+runtime.GOARCH+`/obj.go
+	cmd/link/internal/`+t.arch+`/obj.go
 sed -i \
 	's/cpu.X86.HasAVX512VBMI/& \&\& cpu.X86.HasPOPCNT/' \
 	internal/runtime/gc/scan/scan_amd64.go
@@ -163,7 +166,7 @@ rm \
 	), version
 }
 func init() {
-	artifactsM[Go] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGoLatest,
 
 		Name:        "go",
@@ -171,5 +174,5 @@ func init() {
 		Website:     "https://go.dev/",
 
 		ID: 1227,
-	}
+	})
 }

internal/rosa/gtk.go

@@ -7,8 +7,8 @@ import (
 
 func (t Toolchain) newGLib() (pkg.Artifact, string) {
 	const (
-		version  = "2.88.0"
+		version  = "2.88.1"
-		checksum = "T79Cg4z6j-sDZ2yIwvbY4ccRv2-fbwbqgcw59F5NQ6qJT6z4v261vbYp3dHO6Ma3"
+		checksum = "Rkszn6W4RHjyspyqfXdVAVawdwDJCuS0Zu0f7qot7tbJhnw2fUDoUUJB40m-1MCX"
 	)
 	return t.NewPackage("glib", version, t.newTagRemote(
 		"https://gitlab.gnome.org/GNOME/glib.git",
@@ -42,7 +42,7 @@ func (t Toolchain) newGLib() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[GLib] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGLib,
 
 		Name:        "glib",
@@ -56,5 +56,5 @@ func init() {
 		},
 
 		ID: 10024,
-	}
+	})
 }

internal/rosa/hakurei.go

@@ -14,7 +14,7 @@ go build -o /bin/hostname /usr/src/hostname/main.go
 		hostname = ""
 	}
 
-	return t.New("hakurei"+suffix+"-"+hakureiVersion, 0, t.AppendPresets(nil,
+	return t.New("hakurei"+suffix+"-"+hakureiVersion, 0, t.Append(nil,
 		Go,
 		PkgConfig,
 
@@ -58,14 +58,14 @@ func main() {
 	)))
 }
 func init() {
-	artifactsM[Hakurei] = Metadata{
+	native.MustRegister(&Artifact{
 		f: func(t Toolchain) (pkg.Artifact, string) {
 			return t.newHakurei("", `
 mkdir -p /work/system/libexec/hakurei/
 
-echo '# Building hakurei.'
+echo "Building hakurei for $(go env GOOS)/$(go env GOARCH)."
-go generate -v ./...
+go generate ./...
-go build -trimpath -v -tags=rosa -o /work/system/libexec/hakurei -ldflags="-s -w
+go build -trimpath -tags=rosa -o /work/system/libexec/hakurei -ldflags="-s -w
 	-buildid=
 	-linkmode external
 	-extldflags=-static
@@ -76,7 +76,7 @@ go build -trimpath -v -tags=rosa -o /work/system/libexec/hakurei -ldflags="-s -w
 " ./...
 echo
 
-echo '# Testing hakurei.'
+echo '##### Testing hakurei.'
 go test -ldflags='-buildid= -linkmode external -extldflags=-static' ./...
 echo
 
@@ -93,17 +93,21 @@ mkdir -p /work/system/bin/
 		Website:     "https://hakurei.app/",
 
 		ID: 388834,
-	}
+	})
-	artifactsM[HakureiDist] = Metadata{
+	native.MustRegister(&Artifact{
 		f: func(t Toolchain) (pkg.Artifact, string) {
+			name := "all"
+			if t.opts&OptSkipCheck != 0 {
+				name = "make"
+			}
 			return t.newHakurei("-dist", `
 export HAKUREI_VERSION
-DESTDIR=/work /usr/src/hakurei/all.sh
+DESTDIR=/work /usr/src/hakurei/`+name+`.sh
 `, true), hakureiVersion
 		},
 
 		Name:        "hakurei-dist",
 		Description: "low-level userspace tooling for Rosa OS (distribution tarball)",
 		Website:     "https://hakurei.app/",
-	}
+	})
 }

internal/rosa/hakurei_release.go

@@ -4,13 +4,13 @@ package rosa
 
 import "hakurei.app/internal/pkg"
 
-const hakureiVersion = "0.4.0"
+const hakureiVersion = "0.4.2"
 
 // hakureiSource is the source code of a hakurei release.
 var hakureiSource = newTar(
 	"https://git.gensokyo.uk/rosa/hakurei/archive/"+
 		"v"+hakureiVersion+".tar.gz",
-	"wfQ9DqCW0Fw9o91wj-I55waoqzB-UqzzuC0_2h-P-1M78SgZ1WHSPCDJMth6EyC2",
+	"jadgaOrxv5ABGvzQ_Rk0aPGz7U8K-427TbMhQNQ32scSizEnlR44Pu7NoWYWVZWq",
 	pkg.TarGzip,
 )
 

internal/rosa/hwdata.go

@@ -0,0 +1,34 @@
+package rosa
+
+import "hakurei.app/internal/pkg"
+
+func (t Toolchain) newHwdata() (pkg.Artifact, string) {
+	const (
+		version  = "0.407"
+		checksum = "6p1XD0CRuzt6hLfjv4ShKBW934BexmoPkRrmwxD4J63fBVCzVBRHyF8pVJdW_Xjm"
+	)
+	return t.NewPackage("hwdata", version, newFromGitHub(
+		"vcrhonek/hwdata",
+		"v"+version, checksum,
+	), &PackageAttr{
+		Writable:    true,
+		EnterSource: true,
+	}, &MakeHelper{
+		// awk: fatal: cannot open file `hwdata.spec' for reading: No such file or directory
+		InPlace: true,
+
+		// lspci: Unknown option 'A' (see "lspci --help")
+		SkipCheck: true,
+	}), version
+}
+func init() {
+	native.MustRegister(&Artifact{
+		f: Toolchain.newHwdata,
+
+		Name:        "hwdata",
+		Description: "contains various hardware identification and configuration data",
+		Website:     "https://github.com/vcrhonek/hwdata",
+
+		ID: 5387,
+	})
+}

internal/rosa/images.go

@@ -6,7 +6,7 @@ import (
 )
 
 func init() {
-	artifactsM[EarlyInit] = Metadata{
+	native.MustRegister(&Artifact{
 		Name:        "earlyinit",
 		Description: "Rosa OS initramfs init program",
 
@@ -24,15 +24,14 @@ go build -trimpath -v -o /work/system/libexec/hakurei -ldflags="-s -w
 echo
 `, false), Unversioned
 		},
-	}
+	})
 }
-
 func (t Toolchain) newImageSystem() (pkg.Artifact, string) {
-	return t.New("system.img", TNoToolchain, t.AppendPresets(nil,
+	return t.New("system.img", TNoToolchain, t.Append(nil,
 		SquashfsTools,
 	), nil, nil, `
 mksquashfs /mnt/system /work/system.img
-`, pkg.Path(fhs.AbsRoot.Append("mnt"), false, t.AppendPresets(nil,
+`, pkg.Path(fhs.AbsRoot.Append("mnt"), false, t.Append(nil,
 		Musl,
 		Mksh,
 		Toybox,
@@ -43,16 +42,15 @@ mksquashfs /mnt/system /work/system.img
 	)...)), Unversioned
 }
 func init() {
-	artifactsM[ImageSystem] = Metadata{
+	native.MustRegister(&Artifact{
 		Name:        "system-image",
 		Description: "Rosa OS system image",
 
 		f: Toolchain.newImageSystem,
-	}
+	})
 }
-
 func (t Toolchain) newImageInitramfs() (pkg.Artifact, string) {
-	return t.New("initramfs", TNoToolchain, t.AppendPresets(nil,
+	return t.New("initramfs", TNoToolchain, t.Append(nil,
 		Zstd,
 		EarlyInit,
 		GenInitCPIO,
@@ -66,10 +64,10 @@ file /init /system/libexec/hakurei/earlyinit 0555 0 0
 `)))), Unversioned
 }
 func init() {
-	artifactsM[ImageInitramfs] = Metadata{
+	native.MustRegister(&Artifact{
 		Name:        "initramfs-image",
 		Description: "Rosa OS initramfs image",
 
 		f: Toolchain.newImageInitramfs,
-	}
+	})
 }

internal/rosa/kernel.go

@@ -2,12 +2,12 @@ package rosa
 
 import "hakurei.app/internal/pkg"
 
-const kernelVersion = "6.12.84"
+const kernelVersion = "6.12.87"
 
 var kernelSource = newTar(
 	"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/"+
 		"snapshot/linux-"+kernelVersion+".tar.gz",
-	"GJLUEu68r3DpLYoTcMl4wA_ThMBs_Zwc0gZsp82ii_3AOfcVxpI639IKfq2jAAY2",
+	"QTl5teIy0K5KsOLYGHQ3FbnPCZNRH2bySXVzghiOoHDdM3zAcSPUkmdly85lMzHx",
 	pkg.TarGzip,
 )
 
@@ -19,18 +19,35 @@ chmod -R +w /work/usr/src/linux/
 `, pkg.Path(AbsUsrSrc.Append("linux"), false, kernelSource)), kernelVersion
 }
 func init() {
-	artifactsM[KernelSource] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newKernelSource,
 
 		Name:        "kernel-source",
 		Description: "a writable kernel source tree installed to /usr/src/linux",
 		Website:     "https://kernel.org/",
-	}
+	})
 }
 
 func (t Toolchain) newKernelHeaders() (pkg.Artifact, string) {
+	checksum := perArch[string]{
+		"amd64": "lCmBNcMeUmXifg0vecKOPy3GAaFcJSmOPnf3wit9xYTDSTsFADPt1xxUFfmTn1fD",
+		"arm64": "PlRxp4JzZeMGx7CScRlT1NBzc2NVyJlb8Gm8sa3ofFght9ZT101ZJhcIXiCkHSHM",
+	}
 	return t.NewPackage("kernel-headers", kernelVersion, kernelSource, &PackageAttr{
-		Flag: TEarly,
+		Flag:          TEarly,
+		KnownChecksum: new(mustDecode(checksum.unwrap(t.S))),
+
+		Paths: []pkg.ExecPath{
+			// updated manually for API changes
+			pkg.Path(AbsUsrSrc.Append("version.h"), false, pkg.NewFile(
+				"version.h", []byte(`#define LINUX_VERSION_CODE 396372
+#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + ((c) > 255 ? 255 : (c)))
+#define LINUX_VERSION_MAJOR 6
+#define LINUX_VERSION_PATCHLEVEL 12
+#define LINUX_VERSION_SUBLEVEL 84
+`),
+			)),
+		},
 	}, &MakeHelper{
 		SkipConfigure: true,
 
@@ -43,19 +60,23 @@ func (t Toolchain) newKernelHeaders() (pkg.Artifact, string) {
 			"INSTALL_HDR_PATH=/work/system",
 			"headers_install",
 		},
-		Install: "# headers installed during make",
+		Install: `
+cat \
+	/usr/src/version.h > \
+	/work/system/include/linux/version.h
+`,
 	},
 		Rsync,
 	), kernelVersion
 }
 func init() {
-	artifactsM[KernelHeaders] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newKernelHeaders,
 
 		Name:        "kernel-headers",
 		Description: "an installation of kernel headers",
 		Website:     "https://kernel.org/",
-	}
+	})
 }
 
 func (t Toolchain) newKernel() (pkg.Artifact, string) {
@@ -1254,7 +1275,7 @@ rm -v /work/system/lib/modules/` + kernelVersion + `/build
 	), kernelVersion
 }
 func init() {
-	artifactsM[Kernel] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newKernel,
 
 		Name:        "kernel",
@@ -1262,7 +1283,7 @@ func init() {
 		Website:     "https://kernel.org/",
 
 		ID: 375621,
-	}
+	})
 }
 
 func (t Toolchain) newGenInitCPIO() (pkg.Artifact, string) {
@@ -1272,12 +1293,12 @@ cc -o /work/system/bin/gen_init_cpio /usr/src/linux/usr/gen_init_cpio.c
 `, pkg.Path(AbsUsrSrc.Append("linux"), false, kernelSource)), kernelVersion
 }
 func init() {
-	artifactsM[GenInitCPIO] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newGenInitCPIO,
 
 		Name:        "gen_init_cpio",
 		Description: "a program in the kernel source tree for creating initramfs archive",
-	}
+	})
 }
 
 func (t Toolchain) newFirmware() (pkg.Artifact, string) {
@@ -1319,7 +1340,7 @@ func (t Toolchain) newFirmware() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Firmware] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newFirmware,
 
 		Name:        "firmware",
@@ -1327,5 +1348,5 @@ func init() {
 		Website:     "https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/",
 
 		ID: 141464,
-	}
+	})
 }

internal/rosa/kmod.go

@@ -32,7 +32,7 @@ func (t Toolchain) newKmod() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Kmod] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newKmod,
 
 		Name:        "kmod",
@@ -46,5 +46,5 @@ func init() {
 		},
 
 		ID: 1517,
-	}
+	})
 }

internal/rosa/libarchive.go

@@ -0,0 +1,100 @@
+package rosa
+
+import "hakurei.app/internal/pkg"
+
+func (t Toolchain) newLibarchive() (pkg.Artifact, string) {
+	const (
+		version  = "3.8.7"
+		checksum = "CUJK4MDQmZmATClgQBH2Wt-7Ts4iiSUlg1J_TVb6-5IK3rVUgVLIMc5k-bnWB9w3"
+	)
+	return t.NewPackage("libarchive", version, newFromGitHub(
+		"libarchive/libarchive",
+		"v"+version, checksum,
+	), &PackageAttr{
+		Paths: []pkg.ExecPath{
+			pkg.Path(AbsUsrSrc.Append(
+				"CTestCustom.cmake",
+			), false, pkg.NewFile("CTestCustom.cmake", []byte(`
+list(APPEND CTEST_CUSTOM_TESTS_IGNORE
+	"libarchive_test_archive_string_conversion_fail_c"
+	"libarchive_test_archive_string_conversion_fail_latin1"
+	"libarchive_test_archive_string_update_utf8_koi8"
+	"libarchive_test_gnutar_filename_encoding_KOI8R_UTF8"
+	"libarchive_test_gnutar_filename_encoding_KOI8R_CP866"
+	"libarchive_test_gnutar_filename_encoding_CP1251_UTF8"
+	"libarchive_test_gnutar_filename_encoding_Russian_Russia"
+	"libarchive_test_gnutar_filename_encoding_EUCJP_UTF8"
+	"libarchive_test_gnutar_filename_encoding_EUCJP_CP932"
+	"libarchive_test_gnutar_filename_encoding_CP932_UTF8"
+	"libarchive_test_pax_filename_encoding_KOI8R"
+	"libarchive_test_pax_filename_encoding_CP1251"
+	"libarchive_test_pax_filename_encoding_EUCJP"
+	"libarchive_test_pax_filename_encoding_CP932"
+	"libarchive_test_read_format_cpio_filename_UTF8_eucJP"
+	"libarchive_test_read_format_cpio_filename_CP866_KOI8R"
+	"libarchive_test_read_format_cpio_filename_KOI8R_CP866"
+	"libarchive_test_read_format_cpio_filename_UTF8_KOI8R"
+	"libarchive_test_read_format_cpio_filename_UTF8_CP866"
+	"libarchive_test_read_format_cpio_filename_eucJP_CP932"
+	"libarchive_test_read_format_cpio_filename_UTF8_CP932"
+	"libarchive_test_read_format_cpio_filename_CP866_CP1251"
+	"libarchive_test_read_format_cpio_filename_CP866_CP1251_win"
+	"libarchive_test_read_format_cpio_filename_KOI8R_CP1251"
+	"libarchive_test_read_format_cpio_filename_UTF8_CP1251"
+	"libarchive_test_read_format_gtar_filename_CP866_KOI8R"
+	"libarchive_test_read_format_gtar_filename_KOI8R_CP866"
+	"libarchive_test_read_format_gtar_filename_eucJP_CP932"
+	"libarchive_test_read_format_gtar_filename_CP866_CP1251"
+	"libarchive_test_read_format_gtar_filename_CP866_CP1251_win"
+	"libarchive_test_read_format_gtar_filename_KOI8R_CP1251"
+	"libarchive_test_read_format_rar_unicode_CP932"
+	"libarchive_test_read_format_zip_filename_CP932_eucJP"
+	"libarchive_test_read_format_zip_filename_UTF8_eucJP"
+	"libarchive_test_read_format_zip_filename_CP866_KOI8R"
+	"libarchive_test_read_format_zip_filename_KOI8R_CP866"
+	"libarchive_test_read_format_zip_filename_UTF8_KOI8R"
+	"libarchive_test_read_format_zip_filename_UTF8_CP866"
+	"libarchive_test_read_format_zip_filename_CP932_CP932"
+	"libarchive_test_read_format_zip_filename_UTF8_CP932"
+	"libarchive_test_read_format_zip_filename_CP866_CP1251"
+	"libarchive_test_read_format_zip_filename_CP866_CP1251_win"
+	"libarchive_test_read_format_zip_filename_KOI8R_CP1251"
+	"libarchive_test_read_format_zip_filename_UTF8_CP1251"
+	"libarchive_test_ustar_filename_encoding_KOI8R_UTF8"
+	"libarchive_test_ustar_filename_encoding_KOI8R_CP866"
+	"libarchive_test_ustar_filename_encoding_CP1251_UTF8"
+	"libarchive_test_ustar_filename_encoding_Russian_Russia"
+	"libarchive_test_ustar_filename_encoding_EUCJP_UTF8"
+	"libarchive_test_ustar_filename_encoding_EUCJP_CP932"
+	"libarchive_test_ustar_filename_encoding_CP932_UTF8"
+	"libarchive_test_zip_filename_encoding_KOI8R"
+	"libarchive_test_zip_filename_encoding_ru_RU_CP1251"
+	"libarchive_test_zip_filename_encoding_Russian_Russia"
+	"libarchive_test_zip_filename_encoding_EUCJP"
+	"libarchive_test_zip_filename_encoding_CP932"
+	"libarchive_test_read_format_cab_filename"
+	"libarchive_test_read_format_lha_filename"
+	"libarchive_test_read_format_tar_filename"
+	"libarchive_test_read_format_ustar_filename"
+	"libarchive_test_read_append_wrong_filter"
+)
+`))),
+		},
+
+		Writable: true,
+		ScriptEarly: `
+install -Dv /usr/src/CTestCustom.cmake /cure/
+`,
+	}, (*CMakeHelper)(nil)), version
+}
+func init() {
+	native.MustRegister(&Artifact{
+		f: Toolchain.newLibarchive,
+
+		Name:        "libarchive",
+		Description: "multi-format archive and compression library",
+		Website:     "https://www.libarchive.org/",
+
+		ID: 1558,
+	})
+}

internal/rosa/libbsd.go

@@ -4,8 +4,8 @@ import "hakurei.app/internal/pkg"
 
 func (t Toolchain) newLibmd() (pkg.Artifact, string) {
 	const (
-		version  = "1.1.0"
+		version  = "1.2.0"
-		checksum = "9apYqPPZm0j5HQT8sCsVIhnVIqRD7XgN7kPIaTwTqnTuUq5waUAMq4M7ev8CODJ1"
+		checksum = "1rJ6joAO0wwMZvSfnRNkc1MOhywyAq7SM8VmF92NvDtv7Qdl1LRbjm5fg_DFFtGj"
 	)
 	return t.NewPackage("libmd", version, t.newTagRemote(
 		"https://git.hadrons.org/git/libmd.git",
@@ -21,7 +21,7 @@ install -D /usr/src/libmd/src/helper.c src/helper.c
 	), version
 }
 func init() {
-	artifactsM[Libmd] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibmd,
 
 		Name:        "libmd",
@@ -29,7 +29,7 @@ func init() {
 		Website:     "https://www.hadrons.org/software/libmd/",
 
 		ID: 15525,
-	}
+	})
 }
 
 func (t Toolchain) newLibbsd() (pkg.Artifact, string) {
@@ -50,7 +50,7 @@ func (t Toolchain) newLibbsd() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Libbsd] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibbsd,
 
 		Name:        "libbsd",
@@ -58,5 +58,5 @@ func init() {
 		Website:     "https://libbsd.freedesktop.org/",
 
 		ID: 1567,
-	}
+	})
 }

internal/rosa/libcap.go

@@ -42,7 +42,7 @@ ln -s ../system/bin/bash /bin/
 	), version
 }
 func init() {
-	artifactsM[Libcap] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibcap,
 
 		Name:        "libcap",
@@ -50,5 +50,5 @@ func init() {
 		Website:     "https://sites.google.com/site/fullycapable/",
 
 		ID: 1569,
-	}
+	})
 }

internal/rosa/libconfig.go

@@ -0,0 +1,50 @@
+package rosa
+
+import "hakurei.app/internal/pkg"
+
+func (t Toolchain) newLibconfig() (pkg.Artifact, string) {
+	const (
+		version  = "1.8.2"
+		checksum = "fD32hjeAZuTz98g6WYHRwsxphrgrEFqxi5Z1jlJemPckPBfxpS3i5HgshAuA6vmT"
+	)
+	return t.NewPackage("libconfig", version, newFromGitHub(
+		"hyperrealm/libconfig",
+		"v"+version,
+		checksum,
+	), &PackageAttr{
+		Patches: []KV{
+			{"disable-broken-tests", `diff --git a/tests/tests.c b/tests/tests.c
+index eba7eae..f916d2e 100644
+--- a/tests/tests.c
++++ b/tests/tests.c
+@@ -753,7 +753,6 @@ int main(int argc, char **argv)
+   int failures;
+ 
+   TT_SUITE_START(LibConfigTests);
+-  TT_SUITE_TEST(LibConfigTests, ParsingAndFormatting);
+   TT_SUITE_TEST(LibConfigTests, ParseInvalidFiles);
+   TT_SUITE_TEST(LibConfigTests, ParseInvalidStrings);
+   TT_SUITE_TEST(LibConfigTests, BigInt1);
+@@ -768,7 +767,6 @@ int main(int argc, char **argv)
+   TT_SUITE_TEST(LibConfigTests, OverrideSetting);
+   TT_SUITE_TEST(LibConfigTests, SettingLookups);
+   TT_SUITE_TEST(LibConfigTests, ReadStream);
+-  TT_SUITE_TEST(LibConfigTests, BinaryAndHex);
+   TT_SUITE_RUN(LibConfigTests);
+   failures = TT_SUITE_NUM_FAILURES(LibConfigTests);
+   TT_SUITE_END(LibConfigTests);
+`},
+		},
+	}, (*CMakeHelper)(nil)), version
+}
+func init() {
+	native.MustRegister(&Artifact{
+		f: Toolchain.newLibconfig,
+
+		Name:        "libconfig",
+		Description: "a simple library for processing structured configuration files",
+		Website:     "https://hyperrealm.github.io/libconfig/",
+
+		ID: 1580,
+	})
+}

internal/rosa/libdisplay-info.go

@@ -0,0 +1,30 @@
+package rosa
+
+import "hakurei.app/internal/pkg"
+
+func (t Toolchain) newLibdisplayInfo() (pkg.Artifact, string) {
+	const (
+		version  = "0.3.0"
+		checksum = "yjOqPUHHYgRtpqGw5RI1n2Q1_hO5j0LiFNMbjcRWV4Nf71XwwoC9fZMlKBDeLchT"
+	)
+	return t.NewPackage("libdisplay-info", version, newFromGitLab(
+		"gitlab.freedesktop.org",
+		"emersion/libdisplay-info",
+		version, checksum,
+	), nil, (*MesonHelper)(nil),
+		Diffutils,
+
+		Hwdata,
+	), version
+}
+func init() {
+	native.MustRegister(&Artifact{
+		f: Toolchain.newLibdisplayInfo,
+
+		Name:        "libdisplay-info",
+		Description: "EDID and DisplayID library",
+		Website:     "https://gitlab.freedesktop.org/emersion/libdisplay-info",
+
+		ID: 326668,
+	})
+}

internal/rosa/libepoxy.go

@@ -0,0 +1,33 @@
+package rosa
+
+import "hakurei.app/internal/pkg"
+
+func (t Toolchain) newLibepoxy() (pkg.Artifact, string) {
+	const (
+		version  = "1.5.10"
+		checksum = "OHI8wshrlGw6BMGrmSyejJtwzM2gPhyFJrTsKxULyKMmYrfgcOe7Iw2ibVoUND_Q"
+	)
+	return t.NewPackage("libepoxy", version, newFromGitHub(
+		"anholt/libepoxy",
+		version,
+		checksum,
+	), nil, &MesonHelper{
+		Setup: []KV{
+			{"Dglx", "no"},
+			{"Degl", "no"},
+		},
+	},
+		LibX11,
+	), version
+}
+func init() {
+	native.MustRegister(&Artifact{
+		f: Toolchain.newLibepoxy,
+
+		Name:        "libepoxy",
+		Description: "a library for handling OpenGL function pointer management",
+		Website:     "https://github.com/anholt/libepoxy",
+
+		ID: 6090,
+	})
+}

internal/rosa/libev.go

@@ -14,7 +14,7 @@ func (t Toolchain) newLibev() (pkg.Artifact, string) {
 	), nil, (*MakeHelper)(nil)), version
 }
 func init() {
-	artifactsM[Libev] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibev,
 
 		Name:        "libev",
@@ -22,5 +22,5 @@ func init() {
 		Website:     "http://libev.schmorp.de/",
 
 		ID: 1605,
-	}
+	})
 }

internal/rosa/libexpat.go

@@ -8,8 +8,8 @@ import (
 
 func (t Toolchain) newLibexpat() (pkg.Artifact, string) {
 	const (
-		version  = "2.8.0"
+		version  = "2.8.1"
-		checksum = "pnwZ_JSif-OfoWIwk2JYXWHagOWMA3Sh-Ea0p-4Rz9U9mDEeAebhyvnfD7OYOMCk"
+		checksum = "iMEtbOJhQfGof2GxSlxffQSI1va_NDDQ9VIuqcPbNZ0291Dr8wttD5QecYyjIQap"
 	)
 	return t.NewPackage("libexpat", version, newFromGitHubRelease(
 		"libexpat/libexpat",
@@ -22,7 +22,7 @@ func (t Toolchain) newLibexpat() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Libexpat] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibexpat,
 
 		Name:        "libexpat",
@@ -30,5 +30,5 @@ func init() {
 		Website:     "https://libexpat.github.io/",
 
 		ID: 770,
-	}
+	})
 }

internal/rosa/libffi.go

@@ -18,7 +18,7 @@ func (t Toolchain) newLibffi() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Libffi] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibffi,
 
 		Name:        "libffi",
@@ -26,5 +26,5 @@ func init() {
 		Website:     "https://sourceware.org/libffi/",
 
 		ID: 1611,
-	}
+	})
 }

internal/rosa/libgd.go

@@ -24,7 +24,7 @@ mkdir /dev/shm/gd
 	), version
 }
 func init() {
-	artifactsM[Libgd] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibgd,
 
 		Name:        "libgd",
@@ -36,5 +36,5 @@ func init() {
 		},
 
 		ID: 880,
-	}
+	})
 }

internal/rosa/libpng.go

@@ -0,0 +1,38 @@
+package rosa
+
+import (
+	"strings"
+
+	"hakurei.app/internal/pkg"
+)
+
+func (t Toolchain) newLibpng() (pkg.Artifact, string) {
+	const (
+		version  = "1.6.58"
+		checksum = "m_a5lROJH7vmF3cMjqwTUqURuQLhV1JQx2ySPzcN3VPdgDB9pG3UINsIx_mtkr-t"
+	)
+	return t.NewPackage("libpng", version, newTar(
+		"https://downloads.sourceforge.net/project/libpng/libpng"+
+			strings.Join(strings.SplitN(version, ".", 3)[:2], "")+
+			"/"+version+"/libpng-"+version+".tar.gz",
+		checksum,
+		pkg.TarGzip,
+	), nil, (*MakeHelper)(nil),
+		Zlib,
+	), version
+}
+func init() {
+	native.MustRegister(&Artifact{
+		f: Toolchain.newLibpng,
+
+		Name:        "libpng",
+		Description: "the official PNG reference library",
+		Website:     "https://www.libpng.org/pub/png/libpng.html",
+
+		Dependencies: P{
+			Zlib,
+		},
+
+		ID: 1705,
+	})
+}

internal/rosa/libpsl.go

@@ -25,7 +25,7 @@ test_disable 'int main(){return 0;}' tests/test-is-public-builtin.c
 	), version
 }
 func init() {
-	artifactsM[Libpsl] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibpsl,
 
 		Name:        "libpsl",
@@ -33,5 +33,5 @@ func init() {
 		Website:     "https://rockdaboot.github.io/libpsl/",
 
 		ID: 7305,
-	}
+	})
 }

internal/rosa/libseccomp.go

@@ -43,7 +43,7 @@ index adccef3..65a277a 100644
 	), version
 }
 func init() {
-	artifactsM[Libseccomp] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibseccomp,
 
 		Name:        "libseccomp",
@@ -51,5 +51,5 @@ func init() {
 		Website:     "https://github.com/seccomp/libseccomp/",
 
 		ID: 13823,
-	}
+	})
 }

internal/rosa/libtirpc.go

@@ -0,0 +1,44 @@
+package rosa
+
+import (
+	"strings"
+
+	"hakurei.app/internal/pkg"
+)
+
+func (t Toolchain) newLibtirpc() (pkg.Artifact, string) {
+	const (
+		version  = "1.3.7"
+		checksum = "nzFfu7LNvnSNiNAryD1vtnNWnU-Xqee8KqfXUKoBf5yjb5-dkeRkYuRijdCoYLof"
+	)
+	return t.NewPackage("libtirpc", version, t.newTagRemote(
+		"git://linux-nfs.org/~steved/libtirpc",
+		"libtirpc-"+
+			strings.Join(strings.SplitN(version, ".", 3), "-"),
+		checksum,
+	), nil, &MakeHelper{
+		Generate: "sh -e ./bootstrap",
+		Configure: []KV{
+			{"CFLAGS", `"$(pkg-config --cflags libbsd-overlay) ${CFLAGS:-}"`},
+			{"disable-gssapi"},
+		},
+	},
+		Automake,
+		Libtool,
+		PkgConfig,
+
+		Libbsd,
+		KernelHeaders,
+	), version
+}
+func init() {
+	native.MustRegister(&Artifact{
+		f: Toolchain.newLibtirpc,
+
+		Name:        "libtirpc",
+		Description: "a port of Suns Transport-Independent RPC library to Linux",
+		Website:     "https://sourceforge.net/projects/libtirpc/",
+
+		ID: 1740,
+	})
+}

internal/rosa/libucontext.go

@@ -4,8 +4,8 @@ import "hakurei.app/internal/pkg"
 
 func (t Toolchain) newLibucontext() (pkg.Artifact, string) {
 	const (
-		version  = "1.5"
+		version  = "1.5.1"
-		checksum = "Ggk7FMmDNBdCx1Z9PcNWWW6LSpjGYssn2vU0GK5BLXJYw7ZxZbA2m_eSgT9TFnIG"
+		checksum = "mUgeyJknjMxT-5fORzz-rqhZfP3Y7EZGBhOwvhuX7MsF4Pk9wkuwtrLf5IML-jWu"
 	)
 	return t.NewPackage("libucontext", version, newFromGitHub(
 		"kaniini/libucontext",
@@ -21,13 +21,13 @@ func (t Toolchain) newLibucontext() (pkg.Artifact, string) {
 		SkipConfigure: true,
 		InPlace:       true,
 		Make: []string{
-			"ARCH=" + linuxArch(),
+			"ARCH=" + t.linuxArch(),
 		},
 		Install: "make prefix=/system DESTDIR=/work install",
 	}), version
 }
 func init() {
-	artifactsM[Libucontext] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibucontext,
 
 		Name:        "libucontext",
@@ -35,5 +35,5 @@ func init() {
 		Website:     "https://github.com/kaniini/libucontext/",
 
 		ID: 17085,
-	}
+	})
 }

internal/rosa/libxml2.go

@@ -20,7 +20,7 @@ func (t Toolchain) newLibxml2() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Libxml2] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibxml2,
 
 		Name:        "libxml2",
@@ -28,5 +28,5 @@ func init() {
 		Website:     "https://gitlab.gnome.org/GNOME/libxml2/",
 
 		ID: 1783,
-	}
+	})
 }

internal/rosa/libxslt.go

@@ -26,7 +26,7 @@ func (t Toolchain) newLibxslt() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Libxslt] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibxslt,
 
 		Name:        "libxslt",
@@ -38,5 +38,5 @@ func init() {
 		},
 
 		ID: 13301,
-	}
+	})
 }

internal/rosa/llvm.go

@@ -2,7 +2,6 @@ package rosa
 
 import (
 	"regexp"
-	"runtime"
 	"slices"
 	"strings"
 
@@ -31,24 +30,31 @@ func litArgs(verbose bool, skipChecks ...string) string {
 }
 
 func (t Toolchain) newEarlyCompilerRT() (pkg.Artifact, string) {
-	version := t.Version(llvmSource)
+	source, version := t.Load(llvmSource)
 	major, _, _ := strings.Cut(version, ".")
-	return t.NewPackage("early-compiler-rt", version, t.Load(llvmSource), &PackageAttr{
+	return t.NewPackage("early-compiler-rt", version, source, &PackageAttr{
 		Flag: TExclusive,
 	}, &CMakeHelper{
 		Append: []string{"compiler-rt"},
 
 		Cache: []KV{
+			{"ENABLE_LINKER_BUILD_ID", "ON"},
+
 			// libc++ not yet available
 			{"CMAKE_CXX_COMPILER_TARGET", ""},
 
 			{"LLVM_HOST_TRIPLE", `"${ROSA_TRIPLE}"`},
 			{"LLVM_DEFAULT_TARGET_TRIPLE", `"${ROSA_TRIPLE}"`},
+			{"LLVM_ENABLE_RTTI", "ON"},
+			{"LLVM_BUILD_LLVM_DYLIB", "ON"},
+			{"LLVM_LINK_LLVM_DYLIB", "ON"},
 			{"LLVM_ENABLE_PER_TARGET_RUNTIME_DIR", "ON"},
 
 			{"COMPILER_RT_BUILD_BUILTINS", "ON"},
-			{"COMPILER_RT_DEFAULT_TARGET_ONLY", "OFF"},
+			{"COMPILER_RT_DEFAULT_TARGET_ONLY", "ON"},
+			{"COMPILER_RT_USE_BUILTINS_LIBRARY", "ON"},
 			{"COMPILER_RT_SANITIZERS_TO_BUILD", "asan"},
+			{"COMPILER_RT_BUILD_GWP_ASAN", "OFF"},
 
 			// does not work without libunwind
 			{"COMPILER_RT_BUILD_CTX_PROFILE", "OFF"},
@@ -65,10 +71,10 @@ ln -s \
 	"/work/system/lib/clang/` + major + `/lib/"
 
 ln -s \
-	"clang_rt.crtbegin-` + linuxArch() + `.o" \
+	"clang_rt.crtbegin-` + t.linuxArch() + `.o" \
 	"/work/system/lib/${ROSA_TRIPLE}/crtbeginS.o"
 ln -s \
-	"clang_rt.crtend-` + linuxArch() + `.o" \
+	"clang_rt.crtend-` + t.linuxArch() + `.o" \
 	"/work/system/lib/${ROSA_TRIPLE}/crtendS.o"
 `,
 	},
@@ -79,7 +85,7 @@ ln -s \
 	), version
 }
 func init() {
-	artifactsM[earlyCompilerRT] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newEarlyCompilerRT,
 
 		Name:        "early-compiler-rt",
@@ -88,30 +94,40 @@ func init() {
 		Dependencies: P{
 			Musl,
 		},
-	}
+	})
 }
 
 func (t Toolchain) newEarlyRuntimes() (pkg.Artifact, string) {
-	version := t.Version(llvmSource)
+	source, version := t.Load(llvmSource)
-	return t.NewPackage("early-runtimes", version, t.Load(llvmSource), &PackageAttr{
+	return t.NewPackage("early-runtimes", version, source, &PackageAttr{
 		Flag: TExclusive,
 	}, &CMakeHelper{
 		Append: []string{"runtimes"},
 
 		Cache: []KV{
+			{"ENABLE_LINKER_BUILD_ID", "ON"},
+
 			// libc++ not yet available
 			{"CMAKE_CXX_COMPILER_WORKS", "ON"},
 
 			{"LLVM_HOST_TRIPLE", `"${ROSA_TRIPLE}"`},
 			{"LLVM_DEFAULT_TARGET_TRIPLE", `"${ROSA_TRIPLE}"`},
+			{"LLVM_ENABLE_RTTI", "ON"},
+			{"LLVM_BUILD_LLVM_DYLIB", "ON"},
+			{"LLVM_LINK_LLVM_DYLIB", "ON"},
 			{"LLVM_ENABLE_RUNTIMES", "'libunwind;libcxx;libcxxabi'"},
 
+			{"LIBUNWIND_ENABLE_ASSERTIONS", "OFF"},
 			{"LIBUNWIND_USE_COMPILER_RT", "ON"},
 			{"LIBCXX_HAS_MUSL_LIBC", "ON"},
 			{"LIBCXX_USE_COMPILER_RT", "ON"},
+			{"LIBCXX_CXX_ABI", "libcxxabi"},
+			{"LIBCXX_ENABLE_STATIC_ABI_LIBRARY", "OFF"},
+			{"LIBCXX_HARDENING_MODE", "fast"},
 			{"LIBCXX_HAS_ATOMIC_LIB", "OFF"},
 			{"LIBCXXABI_USE_COMPILER_RT", "ON"},
 			{"LIBCXXABI_USE_LLVM_UNWINDER", "ON"},
+			{"LIBCXXABI_ENABLE_STATIC_UNWINDER", "OFF"},
 			{"LIBCXXABI_HAS_CXA_THREAD_ATEXIT_IMPL", "OFF"},
 
 			{"LLVM_ENABLE_ZLIB", "FORCE_ON"},
@@ -129,7 +145,7 @@ func (t Toolchain) newEarlyRuntimes() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[earlyRuntimes] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newEarlyRuntimes,
 
 		Name:        "early-runtimes",
@@ -138,17 +154,17 @@ func init() {
 		Dependencies: P{
 			earlyCompilerRT,
 		},
-	}
+	})
 }
 
 func (t Toolchain) newLLVM() (pkg.Artifact, string) {
-	var early PArtifact = muslHeaders
+	early := muslHeaders
-	if t.isStage0() {
+	if t.stage.isStage0() {
-		// The LLVM build system is buggy around LLVM_LINK_LLVM_DYLIB and leaks
+		// The LLVM build system uses the system installation when building with
-		// the system installation when invoking the newly built toolchain. This
+		// LLVM_LINK_LLVM_DYLIB, since it builds runtimes after the fact, using
-		// is worked around in stage0 by providing standalone builds of
+		// the just-built toolchain. This is unacceptable in stage0 due to the
-		// runtimes. Later stages rely on 3-stage determinism and allows the
+		// potential version difference. Later stages bootstrap off of runtimes
-		// system installation from its previous stage to leak through.
+		// of its previous stage via 3-stage determinism.
 		early = earlyRuntimes
 	}
 
@@ -174,6 +190,7 @@ func (t Toolchain) newLLVM() (pkg.Artifact, string) {
 		{"LLVM_ENABLE_ZLIB", "FORCE_ON"},
 		{"LLVM_ENABLE_ZSTD", "FORCE_ON"},
 		{"LLVM_ENABLE_PER_TARGET_RUNTIME_DIR", "ON"},
+		{"LLVM_INCLUDE_BENCHMARKS", "OFF"},
 		{"CLANG_DEFAULT_RTLIB", "compiler-rt"},
 		{"CLANG_DEFAULT_UNWINDLIB", "libunwind"},
 		{"CLANG_DEFAULT_CXX_STDLIB", "libc++"},
@@ -200,7 +217,7 @@ func (t Toolchain) newLLVM() (pkg.Artifact, string) {
 		}, ";") + "'"},
 	}
 
-	if !t.isStage0() {
+	if !t.stage.isStage0() {
 		skipChecks := []string{
 			// expensive, pointless to run here
 			"benchmarks",
@@ -230,7 +247,7 @@ func (t Toolchain) newLLVM() (pkg.Artifact, string) {
 			// unwind: fails on musl
 			"eh_frame_fde_pc_range",
 		}
-		switch runtime.GOARCH {
+		switch t.arch {
 		case "arm64":
 			skipChecks = append(skipChecks,
 				// LLVM: intermittently crashes
@@ -240,7 +257,7 @@ func (t Toolchain) newLLVM() (pkg.Artifact, string) {
 			)
 		}
 
-		if presetOpts&OptLLVMNoLTO == 0 {
+		if t.opts&OptLLVMNoLTO == 0 {
 			cache = append(cache, []KV{
 				// very expensive
 				{"LLVM_ENABLE_LTO", "Thin"},
@@ -256,8 +273,10 @@ func (t Toolchain) newLLVM() (pkg.Artifact, string) {
 		}...)
 	}
 
-	version := t.Version(llvmSource)
+	source, version := t.Load(llvmSource)
-	return t.NewPackage("llvm", version, t.Load(llvmSource), nil, &CMakeHelper{
+	return t.NewPackage("llvm", version, source, &PackageAttr{
+		Flag: TExclusive,
+	}, &CMakeHelper{
 		Append: []string{"llvm"},
 
 		Cache: cache,
@@ -272,7 +291,7 @@ ln -s clang++ /work/system/bin/c++
 		// installation into test environment, and the tests end up testing the
 		// system installation instead. Tests are disabled on stage0 and relies
 		// on 3-stage determinism to test later stages.
-		SkipTest: t.isStage0(),
+		SkipTest: t.stage.isStage0(),
 
 		Test: `
 chmod +w /bin && ln -s \
@@ -301,11 +320,11 @@ ninja ` + jobsFlagE + ` check-all
 }
 func init() {
 	const (
-		version  = "22.1.4"
+		version  = "22.1.5"
-		checksum = "Bk3t-tV5sD5T0bqefFMcLeFuAwXnhFipywZmqst5hAZs97QQWGKB_5XyAFjj5tDB"
+		checksum = "32gOaLPHcUlo3hkdk5RbFumTE01XKeCAYZcpvn8IDHF95egXVfDFSl6eZL3ChMen"
 	)
 
-	artifactsM[llvmSource] = Metadata{
+	native.MustRegister(&Artifact{
 		f: func(t Toolchain) (pkg.Artifact, string) {
 			return t.NewPatchedSource("llvm", version, newFromGitHub(
 				"llvm/llvm-project",
@@ -318,9 +337,9 @@ func init() {
 		Description: "LLVM monorepo with Rosa OS patches",
 
 		ID: 1830,
-	}
+	})
 
-	artifactsM[LLVM] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLLVM,
 
 		Name:        "llvm",
@@ -332,5 +351,5 @@ func init() {
 			Zstd,
 			Musl,
 		},
-	}
+	})
 }

internal/rosa/llvm_patches.go

@@ -90,8 +90,23 @@ index 8ac8d4eb9181..e46b04a898ca 100644
      addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude);
 `},
 
-	{"path-system-libraries", `diff --git a/clang/lib/Driver/ToolChains/Linux.cpp b/clang/lib/Driver/ToolChains/Linux.cpp
+	{"path-system-libraries", `diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
-index d525b417b4ea..fdc411f2239c 100644
+index cb6a9b242421..b8d31690d1af 100644
+--- a/clang/lib/Driver/ToolChains/Gnu.cpp
++++ b/clang/lib/Driver/ToolChains/Gnu.cpp
+@@ -2314,6 +2314,10 @@ void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
+     Prefixes.push_back("/opt/rh/devtoolset-2/root/usr");
+   }
+ 
++  if (TargetTriple.getVendor() == llvm::Triple::Rosa) {
++    Prefixes.push_back(concat(SysRoot, "/system"));
++  }
++
+   // Fall back to /usr which is used by most non-Solaris systems.
+   Prefixes.push_back(concat(SysRoot, "/usr"));
+ }
+diff --git a/clang/lib/Driver/ToolChains/Linux.cpp b/clang/lib/Driver/ToolChains/Linux.cpp
+index d525b417b4ea..2b93f401733e 100644
 --- a/clang/lib/Driver/ToolChains/Linux.cpp
 +++ b/clang/lib/Driver/ToolChains/Linux.cpp
 @@ -302,6 +302,7 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
@@ -102,18 +117,7 @@ index d525b417b4ea..fdc411f2239c 100644
  
    if (IsCSKY && !SelectedMultilibs.empty())
      SysRoot = SysRoot + SelectedMultilibs.back().osSuffix();
-@@ -337,12 +338,23 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
+@@ -341,8 +342,12 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
-   const std::string OSLibDir = std::string(getOSLibDir(Triple, Args));
-   const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot);
- 
-+  if (IsRosa) {
-+    ExtraOpts.push_back("-rpath");
-+    ExtraOpts.push_back("/system/lib");
-+    ExtraOpts.push_back("-rpath");
-+    ExtraOpts.push_back(concat("/system/lib", Triple.str()));
-+  }
-+
-   // mips32: Debian multilib, we use /libo32, while in other case, /lib is
    // used. We need add both libo32 and /lib.
    if (Arch == llvm::Triple::mips || Arch == llvm::Triple::mipsel) {
      Generic_GCC::AddMultilibPaths(D, SysRoot, "libo32", MultiarchTriple, Paths);
@@ -128,7 +132,7 @@ index d525b417b4ea..fdc411f2239c 100644
    }
    Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths);
  
-@@ -360,18 +372,30 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
+@@ -360,18 +365,30 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
          Paths);
    }
  
@@ -164,7 +168,7 @@ index d525b417b4ea..fdc411f2239c 100644
  }
  
  ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const {
-@@ -572,6 +596,9 @@ std::string Linux::getDynamicLinker(const ArgList &Args) const {
+@@ -572,6 +589,9 @@ std::string Linux::getDynamicLinker(const ArgList &Args) const {
      return Triple.isArch64Bit() ? "/system/bin/linker64" : "/system/bin/linker";
    }
    if (Triple.isMusl()) {
@@ -174,18 +178,5 @@ index d525b417b4ea..fdc411f2239c 100644
      std::string ArchName;
      bool IsArm = false;
  
-diff --git a/clang/tools/clang-installapi/Options.cpp b/clang/tools/clang-installapi/Options.cpp
-index f484d6f33ad8..dca55e72d67e 100644
---- a/clang/tools/clang-installapi/Options.cpp
-+++ b/clang/tools/clang-installapi/Options.cpp
-@@ -514,7 +514,7 @@ bool Options::processFrontendOptions(InputArgList &Args) {
-     FEOpts.FwkPaths = std::move(FrameworkPaths);
- 
-   // Add default framework/library paths.
--  PathSeq DefaultLibraryPaths = {"/usr/lib", "/usr/local/lib"};
-+  PathSeq DefaultLibraryPaths = {"/usr/lib", "/system/lib", "/usr/local/lib"};
-   PathSeq DefaultFrameworkPaths = {"/Library/Frameworks",
-                                    "/System/Library/Frameworks"};
- 
 `},
 }

internal/rosa/lm-sensors.go

@@ -0,0 +1,59 @@
+package rosa
+
+import "hakurei.app/internal/pkg"
+
+func (t Toolchain) newLMSensors() (pkg.Artifact, string) {
+	const (
+		version  = "3-6-2"
+		checksum = "7JYNutrihe-FP6r3ftf96uFZJJWPfxnBHL0ALSMA-vovaXVRr-sAjlLitw7WWpCI"
+	)
+	return t.NewPackage("lm_sensors", version, newFromGitHub(
+		"lm-sensors/lm-sensors",
+		"V"+version,
+		checksum,
+	), &PackageAttr{
+		Writable:    true,
+		Chmod:       true,
+		EnterSource: true,
+
+		ScriptEarly: `
+ln -s \
+	../../system/bin/perl \
+	/usr/bin/
+`,
+	}, &MakeHelper{
+		InPlace:       true,
+		SkipConfigure: true,
+
+		Make: []string{
+			"CC=cc",
+			"ETCDIR=/system/etc",
+			"PREFIX=/system",
+		},
+
+		Check: []string{
+			"CC=cc",
+			"check",
+		},
+
+		Install: "make DESTDIR=/work PREFIX=/system install",
+	},
+		Perl,
+		PerlTestCmd,
+
+		M4,
+		Bison,
+		Flex,
+	), version
+}
+func init() {
+	native.MustRegister(&Artifact{
+		f: Toolchain.newLMSensors,
+
+		Name:        "lm_sensors",
+		Description: "user-space support for hardware monitoring drivers",
+		Website:     "https://hwmon.wiki.kernel.org/lm_sensors",
+
+		ID: 1831,
+	})
+}

internal/rosa/make.go

@@ -27,7 +27,7 @@ cd "$(mktemp -d)"
 	))), version
 }
 func init() {
-	artifactsM[Make] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newMake,
 
 		Name:        "make",
@@ -35,7 +35,7 @@ func init() {
 		Website:     "https://www.gnu.org/software/make/",
 
 		ID: 1877,
-	}
+	})
 }
 
 // MakeHelper is the [Make] build system helper.
@@ -123,7 +123,7 @@ func (attr *MakeHelper) wantsDir() string {
 }
 
 // script generates the cure script.
-func (attr *MakeHelper) script(name string) string {
+func (attr *MakeHelper) script(s *S, name string) string {
 	if attr == nil {
 		attr = new(MakeHelper)
 	}
@@ -194,7 +194,7 @@ make \
 	}
 	scriptMake += "\n"
 
-	if !attr.SkipCheck && presetOpts&OptSkipCheck == 0 {
+	if !attr.SkipCheck && s.opts&OptSkipCheck == 0 {
 		scriptMake += attr.ScriptCheckEarly + `make \
 	` + jobsFlagE + ` \
 	`

internal/rosa/mesa.go

@@ -1,6 +1,10 @@
 package rosa
 
-import "hakurei.app/internal/pkg"
+import (
+	"strings"
+
+	"hakurei.app/internal/pkg"
+)
 
 func (t Toolchain) newLibglvnd() (pkg.Artifact, string) {
 	const (
@@ -12,20 +16,38 @@ func (t Toolchain) newLibglvnd() (pkg.Artifact, string) {
 		"glvnd/libglvnd",
 		"v"+version,
 		checksum,
-	), nil, (*MesonHelper)(nil),
+	), nil, &MesonHelper{
+		Setup: []KV{
+			{"Dx11", "enabled"},
+			{"Dglx", "enabled"},
+		},
+		ScriptCompiled: `
+export DISPLAY=':0'
+Xvfb &
+XVFB_PID="$!"
+trap 'kill $XVFB_PID && wait $XVFB_PID' EXIT
+`,
+	},
 		Binutils, // symbols check fail with llvm nm
+		Xserver,  // test suite wants X server
+
+		LibXext,
 	), version
 }
 func init() {
-	artifactsM[Libglvnd] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibglvnd,
 
 		Name:        "libglvnd",
 		Description: "The GL Vendor-Neutral Dispatch library",
 		Website:     "https://gitlab.freedesktop.org/glvnd/libglvnd",
 
+		Dependencies: P{
+			LibXext,
+		},
+
 		ID: 12098,
-	}
+	})
 }
 
 func (t Toolchain) newLibdrm() (pkg.Artifact, string) {
@@ -50,7 +72,7 @@ func (t Toolchain) newLibdrm() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Libdrm] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibdrm,
 
 		Name:        "libdrm",
@@ -62,5 +84,182 @@ func init() {
 		},
 
 		ID: 1596,
-	}
+	})
+}
+
+func (t Toolchain) newLibva() (pkg.Artifact, string) {
+	const (
+		version  = "2.23.0"
+		checksum = "UmF5tPyWIG_w5kiR3KFpoYbF7UUcaak5tyc-RhOheNTwQlLkPlifreFYCM9FQxbq"
+	)
+	return t.NewPackage("libva", version, newFromGitHub(
+		"intel/libva",
+		version,
+		checksum,
+	), nil, &MesonHelper{
+		Setup: []KV{
+			{"Dwith_x11", "yes"},
+			{"Dwith_glx", "yes"},
+			{"Dwith_wayland", "yes"},
+		},
+	},
+		Libdrm,
+		LibXfixes,
+		Libglvnd,
+		Wayland,
+		KernelHeaders,
+	), version
+}
+func init() {
+	native.MustRegister(&Artifact{
+		f: Toolchain.newLibva,
+
+		Name:        "libva",
+		Description: "an implementation for VA-API (Video Acceleration API)",
+		Website:     "https://01.org/vaapi",
+
+		Dependencies: P{
+			Libdrm,
+			LibXfixes,
+			Libglvnd,
+			Wayland,
+		},
+
+		ID: 1752,
+	})
+}
+
+func (t Toolchain) newMesa() (pkg.Artifact, string) {
+	const (
+		version  = "26.1.0"
+		checksum = "zU0fjqevySBaoi_5SLW3e2UffmGeBdxOuHmAHTH68n2hV-sjYoqg30koLqFXuk5y"
+	)
+	return t.NewPackage("mesa", version, newFromGitLab(
+		"gitlab.freedesktop.org",
+		"mesa/mesa",
+		"mesa-"+version,
+		checksum,
+	), nil, &MesonHelper{
+		Setup: []KV{
+			{"Dplatforms", "x11,wayland"},
+			{"Dvideo-codecs", "all"},
+
+			{"Dglvnd", "enabled"},
+			{"Dgbm", "enabled"},
+
+			{"Dgallium-drivers", strings.Join([]string{
+				"asahi",     // Apple AGX
+				"crocus",    // Intel legacy
+				"etnaviv",   // Vivante GPU designs (mostly NXP/Marvell SoCs)
+				"freedreno", // Qualcomm Adreno (all Qualcomm SoCs)
+				"i915",      // Intel extra legacy
+				"iris",      // new Intel (Broadwell+)
+				"lima",      // ARM Mali 4xx
+				"llvmpipe",  // software renderer
+				"nouveau",   // Nvidia
+				"panfrost",  // ARM Mali Midgard and up (T/G series)
+				"r300",      // very old AMD
+				"r600",      // less old AMD
+				"radeonsi",  // new AMD (GCN+)
+				"softpipe",  // older software renderer
+				"svga",      // VMWare virtualized GPU
+				"tegra",     // Nvidia Tegra SoCs
+				"v3d",       // Broadcom VC5 (Raspberry Pi 4)
+				"vc4",       // Broadcom VC4 (Raspberry Pi 0-3)
+				"virgl",     // QEMU virtualized GPU (aka VirGL)
+				"zink",      // generic OpenGL over Vulkan, experimental
+
+				// d3d12: WSL emulated GPU (aka Dozen)
+				// ethosu: accelerator
+				// rocket: accelerator
+			}, ",")},
+
+			{"Dvulkan-drivers", strings.Join([]string{
+				"amd",         // AMD (aka RADV)
+				"broadcom",    // Broadcom VC5 (Raspberry Pi 4, aka V3D)
+				"freedreno",   // Qualcomm Adreno (all Qualcomm SoCs)
+				"intel",       // new Intel (aka ANV)
+				"intel_hasvk", // Intel Haswell/Broadwell, "legacy" Vulkan driver (https://www.phoronix.com/news/Intel-HasVK-Drop-Dead-Code)
+				"panfrost",    // ARM Mali Midgard and up (T/G series)
+				"swrast",      // software renderer (aka Lavapipe)
+				"virtio",      // QEMU virtualized GPU (aka VirGL)
+				"imagination", // PowerVR Rogue
+				"asahi",       // Apple AGX
+				"gfxstream",   // Android virtualized GPU
+
+				// nouveau: Nouveau (aka NVK), requires rust
+				// microsoft-experimental: WSL virtualized GPU (aka DZN/Dozen)
+				// kosmickrisp: macOS-specific
+			}, ",")},
+			{"Dvulkan-layers", strings.Join([]string{
+				"device-select",
+				"intel-nullhw",
+				"overlay",
+				"screenshot",
+				"anti-lag",
+				"vram-report-limit",
+			}, ",")},
+
+			{"Dfreedreno-kmds", "msm,virtio"},
+			{"Damdgpu-virtio", "true"},
+		},
+	},
+		M4,
+		PythonPackaging,
+		PythonMako,
+		PythonPyYAML,
+		PythonPycparser,
+		Glslang,
+		SPIRVLLVMTranslator,
+
+		Zlib,
+		Zstd,
+		Gzip,
+		Ncurses,
+		Libglvnd,
+		Libexpat,
+		Libva,
+		Libdrm,
+		Elfutils,
+		Bison,
+		Flex,
+		LMSensors,
+		Libconfig,
+		LibdisplayInfo,
+		Wayland,
+		WaylandProtocols,
+		Libxshmfence,
+		LibXxf86vm,
+		LibXrandr,
+		LibxcbUtilKeysyms,
+		Libpng,
+		Libarchive,
+		KernelHeaders,
+	), version
+}
+func init() {
+	native.MustRegister(&Artifact{
+		f: Toolchain.newMesa,
+
+		Name:        "mesa",
+		Description: "open source implementations of OpenGL, OpenGL ES, Vulkan, OpenCL, and more",
+		Website:     "https://mesa3d.org",
+
+		Dependencies: P{
+			Libdrm,
+			Elfutils,
+			LMSensors,
+			LibdisplayInfo,
+			Wayland,
+			Libxshmfence,
+			LibXxf86vm,
+			LibXrandr,
+			LibxcbUtilKeysyms,
+			Libpng,
+		},
+
+		ID: 1970,
+
+		latest: (*Versions).getStable,
+	})
 }

internal/rosa/meson.go

@@ -52,7 +52,7 @@ python3 ./run_project_tests.py \
 	), version
 }
 func init() {
-	artifactsM[Meson] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newMeson,
 
 		Name:        "meson",
@@ -67,7 +67,7 @@ func init() {
 		},
 
 		ID: 6472,
-	}
+	})
 }
 
 // MesonHelper is the [Meson] build system helper.
@@ -106,7 +106,7 @@ func (*MesonHelper) createDir() bool { return false }
 func (*MesonHelper) wantsDir() string { return `"$(mktemp -d)"` }
 
 // script generates the cure script.
-func (attr *MesonHelper) script(name string) string {
+func (attr *MesonHelper) script(s *S, name string) string {
 	if attr == nil {
 		attr = new(MesonHelper)
 	}
@@ -117,7 +117,7 @@ func (attr *MesonHelper) script(name string) string {
 	}
 
 	var scriptTest string
-	if !attr.SkipTest && presetOpts&OptSkipCheck == 0 {
+	if !attr.SkipTest && s.opts&OptSkipCheck == 0 {
 		scriptTest = `
 meson test \
 	--print-errorlogs`
@@ -128,7 +128,7 @@ cd "$(mktemp -d)"
 meson setup \
 	` + strings.Join(slices.Collect(func(yield func(string) bool) {
 		for _, v := range append([]KV{
-			{"wrap-mode", "nodownload"},
+			{"wrap-mode", "nofallback"},
 			{"prefix", "/system"},
 			{"buildtype", "release"},
 		}, attr.Setup...) {

internal/rosa/mksh.go

@@ -7,7 +7,11 @@ func (t Toolchain) newMksh() (pkg.Artifact, string) {
 		version  = "59c"
 		checksum = "0Zj-k4nXEu3IuJY4lvwD2OrC2t27GdZj8SPy4DoaeuBRH1padWb7oREpYgwY8JNq"
 	)
-	return t.New("mksh-"+version, 0, t.AppendPresets(nil,
+	scriptTest := "./test.sh -C regress:no-ctty\n"
+	if t.opts&OptSkipCheck != 0 {
+		scriptTest = ""
+	}
+	return t.New("mksh-"+version, 0, t.Append(nil,
 		Perl,
 		Coreutils,
 	), nil, []string{
@@ -18,8 +22,7 @@ cd "$(mktemp -d)"
 sh /usr/src/mksh/Build.sh -r
 CPPFLAGS="${CPPFLAGS} -DMKSH_BINSHPOSIX -DMKSH_BINSHREDUCED" \
 sh /usr/src/mksh/Build.sh -r -L
-./test.sh -C regress:no-ctty
+`+scriptTest+`
-
 mkdir -p /work/system/bin/
 cp -v mksh /work/system/bin/
 cp -v lksh /work/system/bin/sh
@@ -33,7 +36,7 @@ ln -vs ../system/bin/sh /work/bin/
 	))), version
 }
 func init() {
-	artifactsM[Mksh] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newMksh,
 
 		Name:        "mksh",
@@ -41,5 +44,5 @@ func init() {
 		Website:     "https://www.mirbsd.org/mksh",
 
 		ID: 5590,
-	}
+	})
 }

internal/rosa/musl-fts.go

@@ -24,7 +24,7 @@ func (t Toolchain) newMuslFts() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[MuslFts] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newMuslFts,
 
 		Name:        "musl-fts",
@@ -32,5 +32,5 @@ func init() {
 		Website:     "https://github.com/void-linux/musl-fts",
 
 		ID: 26980,
-	}
+	})
 }

internal/rosa/musl-obstack.go

@@ -24,7 +24,7 @@ func (t Toolchain) newMuslObstack() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[MuslObstack] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newMuslObstack,
 
 		Name:        "musl-obstack",
@@ -32,5 +32,5 @@ func init() {
 		Website:     "https://github.com/void-linux/musl-obstack",
 
 		ID: 146206,
-	}
+	})
 }

internal/rosa/musl.go

@@ -14,7 +14,7 @@ func (t Toolchain) newMusl(headers bool) (pkg.Artifact, string) {
 		SkipCheck:    true,
 		Script: `
 mkdir -p /work/system/bin
-COMPAT_LINKER_NAME="ld-musl-` + linuxArch() + `.so.1"
+COMPAT_LINKER_NAME="ld-musl-` + t.linuxArch() + `.so.1"
 ln -vs ../lib/libc.so /work/system/bin/linker
 ln -vs ../lib/libc.so /work/system/bin/ldd
 ln -vs libc.so "/work/system/lib/${COMPAT_LINKER_NAME}"
@@ -34,9 +34,9 @@ rmdir -v /work/lib
 	}
 
 	env := []string{
-		"LDFLAGS=" + earlyLDFLAGS(false),
+		"LDFLAGS=" + t.earlyLDFLAGS(false),
 	}
-	if t.isStage0() {
+	if t.stage.isStage0() {
 		env = append(env,
 			"CC=clang",
 			"AR=ar",
@@ -53,12 +53,29 @@ rmdir -v /work/lib
 		Chmod: true,
 
 		Env: env,
+
+		Patches: []KV{
+			{"ldso-rosa", `diff --git a/ldso/dynlink.c b/ldso/dynlink.c
+index 715948f4..c2fece68 100644
+--- a/ldso/dynlink.c
++++ b/ldso/dynlink.c
+@@ -1157,7 +1157,7 @@ static struct dso *load_library(const char *name, struct dso *needed_by)
+ 					sys_path = "";
+ 				}
+ 			}
+-			if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib";
++			if (!sys_path) sys_path = "/system/lib:/system/lib/" LDSO_ARCH "-rosa-linux-musl:/lib:/usr/local/lib:/usr/lib";
+ 			fd = path_open(name, sys_path, buf, sizeof buf);
+ 		}
+ 		pathname = buf;
+`},
+		},
 	}, &helper,
 		Coreutils,
 	), version
 }
 func init() {
-	artifactsM[Musl] = Metadata{
+	native.MustRegister(&Artifact{
 		f: func(t Toolchain) (pkg.Artifact, string) {
 			return t.newMusl(false)
 		},
@@ -68,14 +85,14 @@ func init() {
 		Website:     "https://musl.libc.org/",
 
 		ID: 11688,
-	}
+	})
 
-	artifactsM[muslHeaders] = Metadata{
+	native.MustRegister(&Artifact{
 		f: func(t Toolchain) (pkg.Artifact, string) {
 			return t.newMusl(true)
 		},
 
 		Name:        "musl-headers",
 		Description: "system installation of musl headers",
-	}
+	})
 }

internal/rosa/ncurses.go

@@ -26,7 +26,7 @@ func (t Toolchain) newNcurses() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Ncurses] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newNcurses,
 
 		Name:        "ncurses",
@@ -34,5 +34,5 @@ func init() {
 		Website:     "https://invisible-island.net/ncurses/",
 
 		ID: 373226,
-	}
+	})
 }

internal/rosa/netfilter.go

@@ -39,7 +39,7 @@ index d223ac2..a7878d0 100644
 	), version
 }
 func init() {
-	artifactsM[Libmnl] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibmnl,
 
 		Name:        "libmnl",
@@ -47,7 +47,7 @@ func init() {
 		Website:     "https://www.netfilter.org/projects/libmnl/",
 
 		ID: 1663,
-	}
+	})
 }
 
 func (t Toolchain) newLibnftnl() (pkg.Artifact, string) {
@@ -77,7 +77,7 @@ func (t Toolchain) newLibnftnl() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Libnftnl] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibnftnl,
 
 		Name:        "libnftnl",
@@ -89,7 +89,7 @@ func init() {
 		},
 
 		ID: 1681,
-	}
+	})
 }
 
 func (t Toolchain) newIPTables() (pkg.Artifact, string) {
@@ -131,7 +131,7 @@ chmod +w /etc/ && ln -s ../usr/src/iptables/etc/ethertypes /etc/
 	), version
 }
 func init() {
-	artifactsM[IPTables] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newIPTables,
 
 		Name:        "iptables",
@@ -143,5 +143,5 @@ func init() {
 		},
 
 		ID: 1394,
-	}
+	})
 }