container: check capability in test helper

This makes corresponding nixos tests redundant.

Signed-off-by: Ophestra <cat@gensokyo.uk>

.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

@@ -2,5 +2,9 @@
 
 TOOLCHAIN_VERSION="$(go version)"
 cd "$(dirname -- "$0")/"
-echo "# Building cmd/dist using ${TOOLCHAIN_VERSION}."
-go run -v --tags=dist ./cmd/dist
+echo "Building cmd/dist using ${TOOLCHAIN_VERSION}."
+FLAGS=''
+if test -n "$VERBOSE"; then
+    FLAGS="$FLAGS -v"
+fi
+go run $FLAGS --tags=dist ./cmd/dist

check/overlay.go

@@ -4,15 +4,23 @@ import "strings"
 
 const (
 	// SpecialOverlayEscape is the escape string for overlay mount options.
+	//
+	// Deprecated: This is no longer used and will be removed in 0.5.
 	SpecialOverlayEscape = `\`
 	// SpecialOverlayOption is the separator string between overlay mount options.
+	//
+	// Deprecated: This is no longer used and will be removed in 0.5.
 	SpecialOverlayOption = ","
 	// SpecialOverlayPath is the separator string between overlay paths.
+	//
+	// Deprecated: This is no longer used and will be removed in 0.5.
 	SpecialOverlayPath = ":"
 )
 
 // EscapeOverlayDataSegment escapes a string for formatting into the data
 // argument of an overlay mount system call.
+//
+// Deprecated: This is no longer used and will be removed in 0.5.
 func EscapeOverlayDataSegment(s string) string {
 	if s == "" {
 		return ""

cmd/dist/main.go

@@ -42,14 +42,18 @@ func mustRun(ctx context.Context, name string, arg ...string) {
 var comp []byte
 
 func main() {
-	fmt.Println()
 	log.SetFlags(0)
-	log.SetPrefix("# ")
+	log.SetPrefix("")
 
+	verbose := os.Getenv("VERBOSE") != ""
 	version := getenv("HAKUREI_VERSION", "untagged")
 	prefix := getenv("PREFIX", "/usr")
 	destdir := getenv("DESTDIR", "dist")
 
+	if verbose {
+		log.Println()
+	}
+
 	if err := os.MkdirAll(destdir, 0755); err != nil {
 		log.Fatal(err)
 	}
@@ -76,12 +80,17 @@ func main() {
 	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
 	defer cancel()
 
-	log.Println("Building hakurei.")
+	verboseFlag := "-v"
+	if !verbose {
+		verboseFlag = "-buildvcs=false"
+	}
+
+	log.Printf("Building hakurei for %s/%s.", runtime.GOOS, runtime.GOARCH)
 	mustRun(ctx, "go", "generate", "./...")
 	mustRun(
 		ctx, "go", "build",
 		"-trimpath",
-		"-v", "-o", s,
+		verboseFlag, "-o", s,
 		"-ldflags=-s -w "+
 			"-buildid= -linkmode external -extldflags=-static "+
 			"-X hakurei.app/internal/info.buildVersion="+version+" "+
@@ -90,17 +99,17 @@ func main() {
 			"-X main.hakureiPath="+prefix+"/bin/hakurei",
 		"./...",
 	)
-	fmt.Println()
+	log.Println()
 
-	log.Println("Testing Hakurei.")
+	log.Println("##### Testing Hakurei.")
 	mustRun(
 		ctx, "go", "test",
 		"-ldflags=-buildid= -linkmode external -extldflags=-static",
 		"./...",
 	)
-	fmt.Println()
+	log.Println()
 
-	log.Println("Creating distribution.")
+	log.Println("##### Creating distribution.")
 	const suffix = ".tar.gz"
 	distName := "hakurei-" + version + "-" + runtime.GOARCH
 	var f *os.File
@@ -121,7 +130,7 @@ func main() {
 	}()
 
 	h := sha512.New()
-	gw := gzip.NewWriter(io.MultiWriter(f, h))
+	gw, _ := gzip.NewWriterLevel(io.MultiWriter(f, h), gzip.BestCompression)
 	tw := tar.NewWriter(gw)
 
 	mustWriteHeader := func(name string, size int64, mode os.FileMode) {

cmd/mbf/cache.go

@@ -21,6 +21,7 @@ type cache struct {
 
 	cures, jobs        int
 	hostAbstract, idle bool
+	verboseInit        bool
 
 	base string
 }
@@ -45,6 +46,9 @@ 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)

cmd/mbf/main.go

@@ -108,6 +108,10 @@ func main() {
 		&flagCheck,
 		"check", command.BoolFlag(true),
 		"Run test suites",
+	).Flag(
+		&cm.verboseInit,
+		"v", command.BoolFlag(false),
+		"Do not suppress verbose output from init",
 	).Flag(
 		&cm.cures,
 		"cures", command.IntFlag(0),
@@ -471,6 +475,9 @@ func main() {
 			flagExport  string
 			flagRemote  bool
 			flagNoReply bool
+
+			flagBoot bool
+			flagStd  bool
 		)
 		c.NewCommand(
 			"cure",
@@ -484,11 +491,18 @@ func main() {
 					return fmt.Errorf("unknown artifact %q", args[0])
 				}
 
+				t := rosa.Std
+				if flagBoot {
+					t -= 2
+				} else if flagStd {
+					t -= 1
+				}
+
 				switch {
 				default:
 					var pathname *check.Absolute
 					err := cm.Do(func(cache *pkg.Cache) (err error) {
-						pathname, _, err = cache.Cure(rosa.Std.Load(p))
+						pathname, _, err = cache.Cure(t.Load(p))
 						return
 					})
 					if err != nil {
@@ -541,7 +555,7 @@ func main() {
 					return cm.Do(func(cache *pkg.Cache) error {
 						return cache.EnterExec(
 							ctx,
-							rosa.Std.Load(p),
+							t.Load(p),
 							true, os.Stdin, os.Stdout, os.Stderr,
 							rosa.AbsSystem.Append("bin", "mksh"),
 							"sh",
@@ -553,7 +567,7 @@ func main() {
 					if flagNoReply {
 						flags |= remoteNoReply
 					}
-					a := rosa.Std.Load(p)
+					a := t.Load(p)
 					pathname, err := cureRemote(ctx, &addr, a, flags)
 					if !flagNoReply && err == nil {
 						log.Println(pathname)
@@ -591,6 +605,14 @@ func main() {
 			&flagNoReply,
 			"no-reply", command.BoolFlag(false),
 			"Do not receive a reply from the daemon",
+		).Flag(
+			&flagBoot,
+			"boot", command.BoolFlag(false),
+			"Build on the stage0 toolchain",
+		).Flag(
+			&flagStd,
+			"std", command.BoolFlag(false),
+			"Build on the intermediate toolchain",
 		)
 	}
 
@@ -692,6 +714,7 @@ 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)
 				}

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
@@ -342,8 +345,6 @@ 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 +354,6 @@ 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 +410,6 @@ 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 +480,6 @@ func (p *Container) Serve() (err error) {
 			}
 
 		case <-done:
-			p.msg.Verbose("setup payload took", time.Since(t))
 			return
 		}
 	}(p.setup[1])
@@ -491,7 +489,7 @@ func (p *Container) Serve() (err error) {
 		Getuid(),
 		Getgid(),
 		len(p.ExtraFiles),
-		p.msg.IsVerbose(),
+		p.msg.IsVerbose() && !p.Quiet,
 	})
 }
 

container/container_test.go

@@ -16,6 +16,7 @@ import (
 	"strings"
 	"syscall"
 	"testing"
+	"unsafe"
 
 	"hakurei.app/check"
 	"hakurei.app/command"
@@ -233,6 +234,9 @@ func earlyMnt(mnt ...*vfs.MountInfoEntry) func(*testing.T, context.Context) []*v
 	return func(*testing.T, context.Context) []*vfs.MountInfoEntry { return mnt }
 }
 
+//go:linkname toHost hakurei.app/container.toHost
+func toHost(name string) string
+
 var containerTestCases = []struct {
 	name    string
 	filter  bool
@@ -332,13 +336,15 @@ var containerTestCases = []struct {
 		func(t *testing.T, ctx context.Context) []*vfs.MountInfoEntry {
 			return []*vfs.MountInfoEntry{
 				ent("/", hst.PrivateTmp, "rw", "overlay", "overlay",
-					"rw,lowerdir="+
-						container.InternalToHostOvlEscape(ctx.Value(testVal("lower0")).(*check.Absolute).String())+":"+
-						container.InternalToHostOvlEscape(ctx.Value(testVal("lower1")).(*check.Absolute).String())+
+					"rw"+
+						",lowerdir+="+
+						toHost(ctx.Value(testVal("lower0")).(*check.Absolute).String())+
+						",lowerdir+="+
+						toHost(ctx.Value(testVal("lower1")).(*check.Absolute).String())+
 						",upperdir="+
-						container.InternalToHostOvlEscape(ctx.Value(testVal("upper")).(*check.Absolute).String())+
+						toHost(ctx.Value(testVal("upper")).(*check.Absolute).String())+
 						",workdir="+
-						container.InternalToHostOvlEscape(ctx.Value(testVal("work")).(*check.Absolute).String())+
+						toHost(ctx.Value(testVal("work")).(*check.Absolute).String())+
 						",redirect_dir=nofollow,uuid=on,userxattr"),
 			}
 		},
@@ -388,9 +394,11 @@ var containerTestCases = []struct {
 		func(t *testing.T, ctx context.Context) []*vfs.MountInfoEntry {
 			return []*vfs.MountInfoEntry{
 				ent("/", hst.PrivateTmp, "rw", "overlay", "overlay",
-					"ro,lowerdir="+
-						container.InternalToHostOvlEscape(ctx.Value(testVal("lower0")).(*check.Absolute).String())+":"+
-						container.InternalToHostOvlEscape(ctx.Value(testVal("lower1")).(*check.Absolute).String())+
+					"ro"+
+						",lowerdir+="+
+						toHost(ctx.Value(testVal("lower0")).(*check.Absolute).String())+
+						",lowerdir+="+
+						toHost(ctx.Value(testVal("lower1")).(*check.Absolute).String())+
 						",redirect_dir=nofollow,userxattr"),
 			}
 		},
@@ -650,6 +658,58 @@ func init() {
 				return fmt.Errorf("gid: %d, want %d", gid, tc.gid)
 			}
 
+			const (
+				PR_CAP_AMBIENT        = 0x2f
+				PR_CAP_AMBIENT_IS_SET = 0x1
+			)
+			for i := range container.LastCap(nil) {
+				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 is 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 != 0 {
+					return fmt.Errorf("capability %d in set", i)
+				}
+			}
+
+			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)

container/dispatcher.go

@@ -65,6 +65,8 @@ type syscallDispatcher interface {
 	remount(msg message.Msg, target string, flags uintptr) error
 	// mountTmpfs provides mountTmpfs.
 	mountTmpfs(fsname, target string, flags uintptr, size int, perm os.FileMode) error
+	// mountOverlay provides mountOverlay.
+	mountOverlay(target string, options [][2]string) error
 	// ensureFile provides ensureFile.
 	ensureFile(name string, perm, pperm os.FileMode) error
 	// mustLoopback provides mustLoopback.
@@ -169,6 +171,9 @@ func (direct) remount(msg message.Msg, target string, flags uintptr) error {
 func (k direct) mountTmpfs(fsname, target string, flags uintptr, size int, perm os.FileMode) error {
 	return mountTmpfs(k, fsname, target, flags, size, perm)
 }
+func (k direct) mountOverlay(target string, options [][2]string) error {
+	return mountOverlay(target, options)
+}
 func (direct) ensureFile(name string, perm, pperm os.FileMode) error {
 	return ensureFile(name, perm, pperm)
 }

container/dispatcher_test.go

@@ -468,6 +468,14 @@ func (k *kstub) mountTmpfs(fsname, target string, flags uintptr, size int, perm
 		stub.CheckArg(k.Stub, "perm", perm, 4))
 }
 
+func (k *kstub) mountOverlay(target string, options [][2]string) error {
+	k.Helper()
+	return k.Expects("mountOverlay").Error(
+		stub.CheckArg(k.Stub, "target", target, 0),
+		stub.CheckArgReflect(k.Stub, "options", options, 1),
+	)
+}
+
 func (k *kstub) ensureFile(name string, perm, pperm os.FileMode) error {
 	k.Helper()
 	return k.Expects("ensureFile").Error(

container/errors.go

@@ -118,6 +118,10 @@ func errnoFallback(op, path string, err error) (syscall.Errno, *os.PathError) {
 
 // mount wraps syscall.Mount for error handling.
 func mount(source, target, fstype string, flags uintptr, data string) error {
+	if max(len(source), len(target), len(data))+1 > os.Getpagesize() {
+		return &MountError{source, target, fstype, flags, data, syscall.ENOMEM}
+	}
+
 	err := syscall.Mount(source, target, fstype, flags, data)
 	if err == nil {
 		return nil

container/init.go

@@ -223,6 +223,13 @@ 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)
+	}
+
 	/* 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 +249,6 @@ 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)
 	}

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),
@@ -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),
@@ -1799,11 +1801,11 @@ 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),
@@ -1908,11 +1910,11 @@ 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 +2034,11 @@ 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 +2134,11 @@ 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 +2234,11 @@ 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 +2325,11 @@ 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 +2420,11 @@ 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 +2522,11 @@ 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 +2661,11 @@ 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),

container/initoverlay.go

@@ -4,9 +4,9 @@ import (
 	"encoding/gob"
 	"fmt"
 	"slices"
-	"strings"
 
 	"hakurei.app/check"
+	"hakurei.app/ext"
 	"hakurei.app/fhs"
 )
 
@@ -150,7 +150,7 @@ func (o *MountOverlayOp) early(_ *setupState, k syscallDispatcher) error {
 			if v, err := k.evalSymlinks(o.Upper.String()); err != nil {
 				return err
 			} else {
-				o.upper = check.EscapeOverlayDataSegment(toHost(v))
+				o.upper = toHost(v)
 			}
 		}
 
@@ -158,7 +158,7 @@ func (o *MountOverlayOp) early(_ *setupState, k syscallDispatcher) error {
 			if v, err := k.evalSymlinks(o.Work.String()); err != nil {
 				return err
 			} else {
-				o.work = check.EscapeOverlayDataSegment(toHost(v))
+				o.work = toHost(v)
 			}
 		}
 	}
@@ -168,12 +168,39 @@ func (o *MountOverlayOp) early(_ *setupState, k syscallDispatcher) error {
 		if v, err := k.evalSymlinks(a.String()); err != nil {
 			return err
 		} else {
-			o.lower[i] = check.EscapeOverlayDataSegment(toHost(v))
+			o.lower[i] = toHost(v)
 		}
 	}
 	return nil
 }
 
+// mountOverlay sets up an overlay mount via [ext.FS].
+func mountOverlay(target string, options [][2]string) error {
+	fs, err := ext.OpenFS(SourceOverlay, 0)
+	if err != nil {
+		return err
+	}
+	if err = fs.SetString("source", SourceOverlay); err != nil {
+		_ = fs.Close()
+		return err
+	}
+	for _, option := range options {
+		if err = fs.SetString(option[0], option[1]); err != nil {
+			_ = fs.Close()
+			return err
+		}
+	}
+	if err = fs.SetFlag(OptionOverlayUserxattr); err != nil {
+		_ = fs.Close()
+		return err
+	}
+	if err = fs.Mount(target, 0); err != nil {
+		_ = fs.Close()
+		return err
+	}
+	return fs.Close()
+}
+
 func (o *MountOverlayOp) apply(state *setupState, k syscallDispatcher) error {
 	target := o.Target.String()
 	if !o.noPrefix {
@@ -194,7 +221,7 @@ func (o *MountOverlayOp) apply(state *setupState, k syscallDispatcher) error {
 		}
 	}
 
-	options := make([]string, 0, 4)
+	options := make([][2]string, 0, 2+len(o.lower))
 
 	if o.upper == zeroString && o.work == zeroString { // readonly
 		if len(o.Lower) < 2 {
@@ -205,15 +232,16 @@ func (o *MountOverlayOp) apply(state *setupState, k syscallDispatcher) error {
 		if len(o.Lower) == 0 {
 			return &OverlayArgumentError{OverlayEmptyLower, zeroString}
 		}
-		options = append(options,
-			OptionOverlayUpperdir+"="+o.upper,
-			OptionOverlayWorkdir+"="+o.work)
+		options = append(options, [][2]string{
+			{OptionOverlayUpperdir, o.upper},
+			{OptionOverlayWorkdir, o.work},
+		}...)
+	}
+	for _, lower := range o.lower {
+		options = append(options, [2]string{OptionOverlayLowerdir + "+", lower})
 	}
-	options = append(options,
-		OptionOverlayLowerdir+"="+strings.Join(o.lower, check.SpecialOverlayPath),
-		OptionOverlayUserxattr)
 
-	return k.mount(SourceOverlay, target, FstypeOverlay, 0, strings.Join(options, check.SpecialOverlayOption))
+	return k.mountOverlay(target, options)
 }
 
 func (o *MountOverlayOp) late(*setupState, syscallDispatcher) error { return nil }

container/initoverlay_test.go

@@ -97,13 +97,12 @@ func TestMountOverlayOp(t *testing.T) {
 			call("mkdirAll", stub.ExpectArgs{"/sysroot", os.FileMode(0705)}, nil, nil),
 			call("mkdirTemp", stub.ExpectArgs{"/", "overlay.upper.*"}, "overlay.upper.32768", nil),
 			call("mkdirTemp", stub.ExpectArgs{"/", "overlay.work.*"}, "overlay.work.32768", nil),
-			call("mount", stub.ExpectArgs{"overlay", "/sysroot", "overlay", uintptr(0), "" +
-				"upperdir=overlay.upper.32768," +
-				"workdir=overlay.work.32768," +
-				"lowerdir=" +
-				`/host/var/lib/planterette/base/debian\:f92c9052:` +
-				`/host/var/lib/planterette/app/org.chromium.Chromium@debian\:f92c9052,` +
-				"userxattr"}, nil, nil),
+			call("mountOverlay", stub.ExpectArgs{"/sysroot", [][2]string{
+				{"upperdir", "overlay.upper.32768"},
+				{"workdir", "overlay.work.32768"},
+				{"lowerdir+", `/host/var/lib/planterette/base/debian:f92c9052`},
+				{"lowerdir+", `/host/var/lib/planterette/app/org.chromium.Chromium@debian:f92c9052`},
+			}}, nil, nil),
 		}, nil},
 
 		{"short lower ro", &Params{ParentPerm: 0755}, &MountOverlayOp{
@@ -129,11 +128,10 @@ func TestMountOverlayOp(t *testing.T) {
 			call("evalSymlinks", stub.ExpectArgs{"/mnt-root/nix/.ro-store0"}, "/mnt-root/nix/.ro-store0", nil),
 		}, nil, []stub.Call{
 			call("mkdirAll", stub.ExpectArgs{"/nix/store", os.FileMode(0755)}, nil, nil),
-			call("mount", stub.ExpectArgs{"overlay", "/nix/store", "overlay", uintptr(0), "" +
-				"lowerdir=" +
-				"/host/mnt-root/nix/.ro-store:" +
-				"/host/mnt-root/nix/.ro-store0," +
-				"userxattr"}, nil, nil),
+			call("mountOverlay", stub.ExpectArgs{"/nix/store", [][2]string{
+				{"lowerdir+", "/host/mnt-root/nix/.ro-store"},
+				{"lowerdir+", "/host/mnt-root/nix/.ro-store0"},
+			}}, nil, nil),
 		}, nil},
 
 		{"success ro", &Params{ParentPerm: 0755}, &MountOverlayOp{
@@ -147,11 +145,10 @@ func TestMountOverlayOp(t *testing.T) {
 			call("evalSymlinks", stub.ExpectArgs{"/mnt-root/nix/.ro-store0"}, "/mnt-root/nix/.ro-store0", nil),
 		}, nil, []stub.Call{
 			call("mkdirAll", stub.ExpectArgs{"/sysroot/nix/store", os.FileMode(0755)}, nil, nil),
-			call("mount", stub.ExpectArgs{"overlay", "/sysroot/nix/store", "overlay", uintptr(0), "" +
-				"lowerdir=" +
-				"/host/mnt-root/nix/.ro-store:" +
-				"/host/mnt-root/nix/.ro-store0," +
-				"userxattr"}, nil, nil),
+			call("mountOverlay", stub.ExpectArgs{"/sysroot/nix/store", [][2]string{
+				{"lowerdir+", "/host/mnt-root/nix/.ro-store"},
+				{"lowerdir+", "/host/mnt-root/nix/.ro-store0"},
+			}}, nil, nil),
 		}, nil},
 
 		{"nil lower", &Params{ParentPerm: 0700}, &MountOverlayOp{
@@ -219,7 +216,11 @@ func TestMountOverlayOp(t *testing.T) {
 			call("evalSymlinks", stub.ExpectArgs{"/mnt-root/nix/.ro-store"}, "/mnt-root/nix/ro-store", nil),
 		}, nil, []stub.Call{
 			call("mkdirAll", stub.ExpectArgs{"/sysroot/nix/store", os.FileMode(0700)}, nil, nil),
-			call("mount", stub.ExpectArgs{"overlay", "/sysroot/nix/store", "overlay", uintptr(0), "upperdir=/host/mnt-root/nix/.rw-store/.upper,workdir=/host/mnt-root/nix/.rw-store/.work,lowerdir=/host/mnt-root/nix/ro-store,userxattr"}, nil, stub.UniqueError(0)),
+			call("mountOverlay", stub.ExpectArgs{"/sysroot/nix/store", [][2]string{
+				{"upperdir", "/host/mnt-root/nix/.rw-store/.upper"},
+				{"workdir", "/host/mnt-root/nix/.rw-store/.work"},
+				{"lowerdir+", "/host/mnt-root/nix/ro-store"},
+			}}, nil, stub.UniqueError(0)),
 		}, stub.UniqueError(0)},
 
 		{"success single layer", &Params{ParentPerm: 0700}, &MountOverlayOp{
@@ -233,11 +234,11 @@ func TestMountOverlayOp(t *testing.T) {
 			call("evalSymlinks", stub.ExpectArgs{"/mnt-root/nix/.ro-store"}, "/mnt-root/nix/ro-store", nil),
 		}, nil, []stub.Call{
 			call("mkdirAll", stub.ExpectArgs{"/sysroot/nix/store", os.FileMode(0700)}, nil, nil),
-			call("mount", stub.ExpectArgs{"overlay", "/sysroot/nix/store", "overlay", uintptr(0), "" +
-				"upperdir=/host/mnt-root/nix/.rw-store/.upper," +
-				"workdir=/host/mnt-root/nix/.rw-store/.work," +
-				"lowerdir=/host/mnt-root/nix/ro-store," +
-				"userxattr"}, nil, nil),
+			call("mountOverlay", stub.ExpectArgs{"/sysroot/nix/store", [][2]string{
+				{"upperdir", "/host/mnt-root/nix/.rw-store/.upper"},
+				{"workdir", "/host/mnt-root/nix/.rw-store/.work"},
+				{"lowerdir+", "/host/mnt-root/nix/ro-store"},
+			}}, nil, nil),
 		}, nil},
 
 		{"success", &Params{ParentPerm: 0700}, &MountOverlayOp{
@@ -261,16 +262,15 @@ func TestMountOverlayOp(t *testing.T) {
 			call("evalSymlinks", stub.ExpectArgs{"/mnt-root/nix/.ro-store3"}, "/mnt-root/nix/ro-store3", nil),
 		}, nil, []stub.Call{
 			call("mkdirAll", stub.ExpectArgs{"/sysroot/nix/store", os.FileMode(0700)}, nil, nil),
-			call("mount", stub.ExpectArgs{"overlay", "/sysroot/nix/store", "overlay", uintptr(0), "" +
-				"upperdir=/host/mnt-root/nix/.rw-store/.upper," +
-				"workdir=/host/mnt-root/nix/.rw-store/.work," +
-				"lowerdir=" +
-				"/host/mnt-root/nix/ro-store:" +
-				"/host/mnt-root/nix/ro-store0:" +
-				"/host/mnt-root/nix/ro-store1:" +
-				"/host/mnt-root/nix/ro-store2:" +
-				"/host/mnt-root/nix/ro-store3," +
-				"userxattr"}, nil, nil),
+			call("mountOverlay", stub.ExpectArgs{"/sysroot/nix/store", [][2]string{
+				{"upperdir", "/host/mnt-root/nix/.rw-store/.upper"},
+				{"workdir", "/host/mnt-root/nix/.rw-store/.work"},
+				{"lowerdir+", "/host/mnt-root/nix/ro-store"},
+				{"lowerdir+", "/host/mnt-root/nix/ro-store0"},
+				{"lowerdir+", "/host/mnt-root/nix/ro-store1"},
+				{"lowerdir+", "/host/mnt-root/nix/ro-store2"},
+				{"lowerdir+", "/host/mnt-root/nix/ro-store3"},
+			}}, nil, nil),
 		}, nil},
 	})
 

container/path_test.go

@@ -10,7 +10,6 @@ import (
 	"testing"
 	"unsafe"
 
-	"hakurei.app/check"
 	"hakurei.app/vfs"
 )
 
@@ -50,9 +49,6 @@ func TestToHost(t *testing.T) {
 	}
 }
 
-// InternalToHostOvlEscape exports toHost passed to [check.EscapeOverlayDataSegment].
-func InternalToHostOvlEscape(s string) string { return check.EscapeOverlayDataSegment(toHost(s)) }
-
 func TestCreateFile(t *testing.T) {
 	t.Run("nonexistent", func(t *testing.T) {
 		t.Run("mkdir", func(t *testing.T) {

ext/fs.go

@@ -0,0 +1,267 @@
+package ext
+
+import (
+	"os"
+	"runtime"
+	"syscall"
+	"unsafe"
+)
+
+// include/uapi/linux/mount.h
+
+/*
+ * move_mount() flags.
+ */
+const (
+	MOVE_MOUNT_F_SYMLINKS   = 1 << iota /* Follow symlinks on from path */
+	MOVE_MOUNT_F_AUTOMOUNTS             /* Follow automounts on from path */
+	MOVE_MOUNT_F_EMPTY_PATH             /* Empty from path permitted */
+	_
+	MOVE_MOUNT_T_SYMLINKS   /* Follow symlinks on to path */
+	MOVE_MOUNT_T_AUTOMOUNTS /* Follow automounts on to path */
+	MOVE_MOUNT_T_EMPTY_PATH /* Empty to path permitted */
+	_
+	MOVE_MOUNT_SET_GROUP /* Set sharing group instead */
+	MOVE_MOUNT_BENEATH   /* Mount beneath top mount */
+)
+
+/*
+ * fsopen() flags.
+ */
+const (
+	FSOPEN_CLOEXEC = 1 << iota
+)
+
+/*
+ * fspick() flags.
+ */
+const (
+	FSPICK_CLOEXEC = 1 << iota
+	FSPICK_SYMLINK_NOFOLLOW
+	FSPICK_NO_AUTOMOUNT
+	FSPICK_EMPTY_PATH
+)
+
+/*
+ * The type of fsconfig() call made.
+ */
+const (
+	FSCONFIG_SET_FLAG        = iota /* Set parameter, supplying no value */
+	FSCONFIG_SET_STRING             /* Set parameter, supplying a string value */
+	FSCONFIG_SET_BINARY             /* Set parameter, supplying a binary blob value */
+	FSCONFIG_SET_PATH               /* Set parameter, supplying an object by path */
+	FSCONFIG_SET_PATH_EMPTY         /* Set parameter, supplying an object by (empty) path */
+	FSCONFIG_SET_FD                 /* Set parameter, supplying an object by fd */
+	FSCONFIG_CMD_CREATE             /* Create new or reuse existing superblock */
+	FSCONFIG_CMD_RECONFIGURE        /* Invoke superblock reconfiguration */
+	FSCONFIG_CMD_CREATE_EXCL        /* Create new superblock, fail if reusing existing superblock */
+)
+
+/*
+ * fsmount() flags.
+ */
+const (
+	FSMOUNT_CLOEXEC = 1 << iota
+)
+
+/*
+ * Mount attributes.
+ */
+const (
+	MOUNT_ATTR_RDONLY      = 0x00000001 /* Mount read-only */
+	MOUNT_ATTR_NOSUID      = 0x00000002 /* Ignore suid and sgid bits */
+	MOUNT_ATTR_NODEV       = 0x00000004 /* Disallow access to device special files */
+	MOUNT_ATTR_NOEXEC      = 0x00000008 /* Disallow program execution */
+	MOUNT_ATTR__ATIME      = 0x00000070 /* Setting on how atime should be updated */
+	MOUNT_ATTR_RELATIME    = 0x00000000 /* - Update atime relative to mtime/ctime. */
+	MOUNT_ATTR_NOATIME     = 0x00000010 /* - Do not update access times. */
+	MOUNT_ATTR_STRICTATIME = 0x00000020 /* - Always perform atime updates */
+	MOUNT_ATTR_NODIRATIME  = 0x00000080 /* Do not update directory access times */
+	MOUNT_ATTR_IDMAP       = 0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */
+	MOUNT_ATTR_NOSYMFOLLOW = 0x00200000 /* Do not follow symlinks */
+)
+
+// FS provides low-level wrappers around the suite of file-descriptor-based
+// mount facilities in Linux.
+type FS struct {
+	fd uintptr
+	c  runtime.Cleanup
+}
+
+// newFS allocates a new [FS] for the specified fd.
+func newFS(fd uintptr) *FS {
+	fs := FS{fd: fd}
+	fs.c = runtime.AddCleanup(&fs, func(fd uintptr) {
+		_ = syscall.Close(int(fd))
+	}, fd)
+	return &fs
+}
+
+// Close closes the underlying filesystem context.
+func (fs *FS) Close() error {
+	if fs == nil {
+		return syscall.EINVAL
+	}
+	err := syscall.Close(int(fs.fd))
+	fs.c.Stop()
+	return err
+}
+
+// OpenFS creates a new filesystem context.
+func OpenFS(fsname string, flags int) (fs *FS, err error) {
+	var s *byte
+	s, err = syscall.BytePtrFromString(fsname)
+	if err != nil {
+		return
+	}
+	fd, _, errno := syscall.Syscall(
+		SYS_FSOPEN,
+		uintptr(unsafe.Pointer(s)),
+		uintptr(flags|FSOPEN_CLOEXEC),
+		0,
+	)
+	if errno != 0 {
+		err = os.NewSyscallError("fsopen", errno)
+	} else {
+		fs = newFS(fd)
+	}
+	return
+}
+
+// PickFS selects filesystem for reconfiguration.
+func PickFS(dirfd int, pathname string, flags int) (fs *FS, err error) {
+	var s *byte
+	s, err = syscall.BytePtrFromString(pathname)
+	if err != nil {
+		return
+	}
+	fd, _, errno := syscall.Syscall(
+		SYS_FSPICK,
+		uintptr(dirfd),
+		uintptr(unsafe.Pointer(s)),
+		uintptr(flags|FSPICK_CLOEXEC),
+	)
+	if errno != 0 {
+		err = os.NewSyscallError("fspick", errno)
+	} else {
+		fs = newFS(fd)
+	}
+	return
+}
+
+// config configures new or existing filesystem context.
+func (fs *FS) config(cmd uint, key *byte, value unsafe.Pointer, aux int) (err error) {
+	_, _, errno := syscall.Syscall6(
+		SYS_FSCONFIG,
+		fs.fd,
+		uintptr(cmd),
+		uintptr(unsafe.Pointer(key)),
+		uintptr(value),
+		uintptr(aux),
+		0,
+	)
+	if errno != 0 {
+		err = os.NewSyscallError("fsconfig", errno)
+	}
+	return
+}
+
+// SetFlag sets the flag parameter named by key. ([FSCONFIG_SET_FLAG])
+func (fs *FS) SetFlag(key string) (err error) {
+	var s *byte
+	s, err = syscall.BytePtrFromString(key)
+	if err != nil {
+		return
+	}
+
+	return fs.config(FSCONFIG_SET_FLAG, s, nil, 0)
+}
+
+// SetString sets the string parameter named by key to the value specified by
+// value. ([FSCONFIG_SET_STRING])
+func (fs *FS) SetString(key, value string) (err error) {
+	var s0 *byte
+	s0, err = syscall.BytePtrFromString(key)
+	if err != nil {
+		return
+	}
+
+	var s1 *byte
+	s1, err = syscall.BytePtrFromString(value)
+	if err != nil {
+		return
+	}
+
+	return fs.config(FSCONFIG_SET_STRING, s0, unsafe.Pointer(s1), 0)
+}
+
+// mount instantiates mount object from filesystem context.
+func (fs *FS) mount(flags, attrFlags int) (fsfd int, err error) {
+	r, _, errno := syscall.Syscall(
+		SYS_FSMOUNT,
+		fs.fd,
+		uintptr(flags|FSMOUNT_CLOEXEC),
+		uintptr(attrFlags),
+	)
+	fsfd = int(r)
+	if errno != 0 {
+		err = os.NewSyscallError("fsmount", errno)
+	}
+	return
+}
+
+// MoveMount moves or attaches mount object to filesystem.
+func MoveMount(
+	fromDirfd int,
+	fromPathname string,
+	toDirfd int,
+	toPathname string,
+	flags int,
+) (err error) {
+	var s0 *byte
+	s0, err = syscall.BytePtrFromString(fromPathname)
+	if err != nil {
+		return
+	}
+
+	var s1 *byte
+	s1, err = syscall.BytePtrFromString(toPathname)
+	if err != nil {
+		return
+	}
+
+	_, _, errno := syscall.Syscall6(
+		SYS_MOVE_MOUNT,
+		uintptr(fromDirfd),
+		uintptr(unsafe.Pointer(s0)),
+		uintptr(toDirfd),
+		uintptr(unsafe.Pointer(s1)),
+		uintptr(flags),
+		0,
+	)
+	if errno != 0 {
+		err = os.NewSyscallError("move_mount", errno)
+	}
+	return
+}
+
+// Mount attaches the underlying filesystem context to the specified pathname.
+func (fs *FS) Mount(pathname string, attrFlags int) error {
+	if err := fs.config(FSCONFIG_CMD_CREATE_EXCL, nil, nil, 0); err != nil {
+		return err
+	}
+	fd, err := fs.mount(0, attrFlags)
+	if err != nil {
+		return err
+	}
+	err = MoveMount(
+		fd, "",
+		-1, pathname,
+		MOVE_MOUNT_F_EMPTY_PATH,
+	)
+	closeErr := syscall.Close(fd)
+	if err == nil {
+		err = closeErr
+	}
+	return err
+}

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

@@ -436,6 +436,7 @@ 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)})
@@ -630,12 +631,6 @@ 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 +645,11 @@ 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

@@ -1,11 +1,10 @@
 package pkg_test
 
-//go:generate env CGO_ENABLED=0 go build -tags testtool -o testdata/testtool ./testdata
-
 import (
 	_ "embed"
 	"encoding/gob"
 	"errors"
+	"io/fs"
 	"net"
 	"os"
 	"os/exec"
@@ -17,20 +16,26 @@ import (
 	"hakurei.app/hst"
 	"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 TestExec(t *testing.T) {
 	t.Parallel()
 
-	wantChecksumOffline := pkg.MustDecode(
-		"GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9",
-	)
+	wantOffline := expectsFS{
+		".": {Mode: fs.ModeDir | 0500},
+
+		"check": {Mode: 0400, Data: []byte{0}},
+	}
+	wantOfflineEncode := pkg.Encode(wantOffline.hash())
 
 	checkWithCache(t, []cacheTestCase{
 		{"offline", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
@@ -58,7 +63,7 @@ func TestExec(t *testing.T) {
 						},
 					}),
 					pkg.MustPath("/opt", false, testtool),
-				), ignorePathname, wantChecksumOffline, nil},
+				), ignorePathname, wantOffline, nil},
 
 				{"error passthrough", pkg.NewExec(
 					"", nil, 0, true,
@@ -74,7 +79,7 @@ func TestExec(t *testing.T) {
 							return stub.UniqueError(0xcafe)
 						},
 					}),
-				), nil, pkg.Checksum{}, &pkg.DependencyCureError{
+				), nil, nil, &pkg.DependencyCureError{
 					{
 						Ident: unique.Make(pkg.ID(pkg.MustDecode(
 							"Sowo6oZRmG6xVtUaxB6bDWZhVsqAJsIJWUp0OPKlE103cY0lodx7dem8J-qQF0Z1",
@@ -91,7 +96,7 @@ func TestExec(t *testing.T) {
 					[]string{"testtool"},
 
 					pkg.ExecPath{},
-				), nil, pkg.Checksum{}, pkg.ErrInvalidPaths},
+				), nil, nil, pkg.ErrInvalidPaths},
 			})
 
 			// check init failure passthrough
@@ -108,17 +113,35 @@ func TestExec(t *testing.T) {
 			}
 
 			testtoolDestroy(t, base, c)
-		}, pkg.MustDecode("Q5DluWQCAeohLoiGRImurwFp3vdz9IfQCoj7Fuhh73s4KQPRHpEQEnHTdNHmB8Fx")},
+		}, 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/_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")},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"net", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			testtool, testtoolDestroy := newTesttool()
 
-			wantChecksum := pkg.MustDecode(
-				"a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W",
-			)
+			wantNet := expectsFS{
+				".": {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, false,
 					pkg.AbsWork,
 					[]string{"HAKUREI_TEST=1"},
 					check.MustAbs("/opt/bin/testtool"),
@@ -138,11 +161,27 @@ func TestExec(t *testing.T) {
 						},
 					}),
 					pkg.MustPath("/opt", false, testtool),
-				), ignorePathname, wantChecksum, nil},
+				), ignorePathname, wantNet, nil},
 			})
 
 			testtoolDestroy(t, base, c)
-		}, pkg.MustDecode("bPYvvqxpfV7xcC1EptqyKNK1klLJgYHMDkzBcoOyK6j_Aj5hb0mXNPwTwPSK5F6Z")},
+		}, expectsFS{
+			".": {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/" + 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")},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"overlay root", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			testtool, testtoolDestroy := newTesttool()
@@ -163,11 +202,25 @@ func TestExec(t *testing.T) {
 						},
 					}),
 					pkg.MustPath("/opt", false, testtool),
-				), ignorePathname, wantChecksumOffline, nil},
+				), ignorePathname, wantOffline, nil},
 			})
 
 			testtoolDestroy(t, base, c)
-		}, pkg.MustDecode("PO2DSSCa4yoSgEYRcCSZfQfwow1yRigL3Ry-hI0RDI4aGuFBha-EfXeSJnG_5_Rl")},
+		}, 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/" + expected.OvlRoot: {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantOfflineEncode)},
+			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"overlay work", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			testtool, testtoolDestroy := newTesttool()
@@ -193,11 +246,25 @@ 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},
 			})
 
 			testtoolDestroy(t, base, c)
-		}, pkg.MustDecode("iaRt6l_Wm2n-h5UsDewZxQkCmjZjyL8r7wv32QT2kyV55-Lx09Dq4gfg9BiwPnKs")},
+		}, 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/" + expected.Work: {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantOfflineEncode)},
+			"identifier/vjz1MHPcGBKV7sjcs8jQP3cqxJ1hgPTiQBMCEHP9BGXjGxd-tJmEmXKaStObo5gK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"multiple layers", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			testtool, testtoolDestroy := newTesttool()
@@ -245,11 +312,30 @@ func TestExec(t *testing.T) {
 						},
 					}),
 					pkg.MustPath("/opt", false, testtool),
-				), ignorePathname, wantChecksumOffline, nil},
+				), ignorePathname, wantOffline, nil},
 			})
 
 			testtoolDestroy(t, base, c)
-		}, pkg.MustDecode("O2YzyR7IUGU5J2CADy0hUZ3A5NkP_Vwzs4UadEdn2oMZZVWRtH0xZGJ3HXiimTnZ")},
+		}, 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{}},
+			"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")},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"overlay layer promotion", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			testtool, testtoolDestroy := newTesttool()
@@ -276,11 +362,26 @@ func TestExec(t *testing.T) {
 						},
 					}),
 					pkg.MustPath("/opt", false, testtool),
-				), ignorePathname, wantChecksumOffline, nil},
+				), ignorePathname, wantOffline, nil},
 			})
 
 			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)},
+
+			"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 +11,25 @@ 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(
-					"vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX",
-				), nil},
+				), want, nil},
 			})
-		}, pkg.MustDecode(
-			"iR6H5OIsyOW4EwEgtm9rGzGF6DVtyHLySEtwnFE8bnus9VJcoCbR4JIek7Lw-vwT",
-		)},
+		}, expectsFS{
+			".": {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")},
+
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 	})
 }

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

@@ -0,0 +1,2 @@
+// Package expected contains expected identifiers for exec artifact tests.
+package expected

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

@@ -0,0 +1,10 @@
+package expected
+
+const (
+	Offline = "dztPS6jRjiZtCF4_p8AzfnxGp6obkhrgFVsxdodbKWUoAEVtDz3MykepJB4kI_ks"
+	OvlRoot = "RdMA-mubnrHuu3Ky1wWyxauSYCO0ZH_zCPUj3uDHqkfwv5sGcByoF_g5PjlGiClb"
+	Layers  = "p1t_drXr34i-jZNuxDMLaMOdL6tZvQqhavNafGynGqxOZoXAUTSn7kqNh3Ovv3DT"
+	Net     = "G8qPxD9puvvoOVV7lrT80eyDeIl3G_CCFoKw12c8mCjMdG1zF7NEPkwYpNubClK3"
+	Promote = "xXTIYcXmgJWNLC91c417RRrNM9cjELwEZHpGvf8Fk_GNP5agRJp_SicD0w9aMeLJ"
+	Work    = "5hlaukCirnXE4W_RSLJFOZN47Z5RiHnacXzdFp_70cLgiJUGR6cSb_HaFftkzi0-"
+)

internal/pkg/internal/testtool/main.go

@@ -14,9 +14,10 @@ import (
 	"strconv"
 	"strings"
 
-	"hakurei.app/check"
 	"hakurei.app/fhs"
 	"hakurei.app/vfs"
+
+	"hakurei.app/internal/pkg/internal/testtool/expected"
 )
 
 func main() {
@@ -148,59 +149,40 @@ 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" {
 			log.Fatal("unexpected root mount entry")
 		}
-		var lowerdir string
+		var lowerdir []string
 		for _, o := range strings.Split(m.FsOptstr, ",") {
-			const lowerdirKey = "lowerdir="
+			const lowerdirKey = "lowerdir+="
 			if strings.HasPrefix(o, lowerdirKey) {
-				lowerdir = o[len(lowerdirKey):]
+				lowerdir = append(lowerdir, o[len(lowerdirKey):])
 			}
 		}
 		if !layers {
-			if filepath.Base(lowerdir) != checksumEmptyDir {
+			if len(lowerdir) != 1 || filepath.Base(lowerdir[0]) != checksumEmptyDir {
 				log.Fatal("unexpected artifact checksum")
 			}
 		} else {
-			ident = "p1t_drXr34i-jZNuxDMLaMOdL6tZvQqhavNafGynGqxOZoXAUTSn7kqNh3Ovv3DT"
+			ident = expected.Layers
 
-			lowerdirsEscaped := strings.Split(lowerdir, ":")
-			lowerdirs := lowerdirsEscaped[:0]
-			// ignore the option separator since it does not appear in ident
-			for i, e := range lowerdirsEscaped {
-				if len(e) > 0 &&
-					e[len(e)-1] == check.SpecialOverlayEscape[0] &&
-					(len(e) == 1 || e[len(e)-2] != check.SpecialOverlayEscape[0]) {
-					// ignore escaped pathname separator since it does not
-					// appear in ident
-
-					e = e[:len(e)-1]
-					if len(lowerdirsEscaped) != i {
-						lowerdirsEscaped[i+1] = e + lowerdirsEscaped[i+1]
-						continue
-					}
-				}
-				lowerdirs = append(lowerdirs, e)
-			}
-
-			if len(lowerdirs) != 2 ||
-				filepath.Base(lowerdirs[0]) != "MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU" ||
-				filepath.Base(lowerdirs[1]) != "nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK" {
-				log.Fatalf("unexpected lowerdirs %s", strings.Join(lowerdirs, ", "))
+			if len(lowerdir) != 2 ||
+				filepath.Base(lowerdir[0]) != "MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU" ||
+				filepath.Base(lowerdir[1]) != "nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK" {
+				log.Fatalf("unexpected lowerdirs %s", strings.Join(lowerdir, ", "))
 			}
 		}
 	} else {
 		if hostNet {
-			ident = "G8qPxD9puvvoOVV7lrT80eyDeIl3G_CCFoKw12c8mCjMdG1zF7NEPkwYpNubClK3"
+			ident = expected.Net
 		}
 
 		if m.Root != "/sysroot" || m.Target != "/" {
@@ -219,14 +201,14 @@ 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_test.go

@@ -3,6 +3,7 @@ package pkg_test
 import (
 	"bytes"
 	"io"
+	"io/fs"
 	"reflect"
 	"testing"
 
@@ -105,9 +106,12 @@ func TestIRRoundtrip(t *testing.T) {
 				if err := <-done; err != nil {
 					t.Fatalf("EncodeAll: error = %v", err)
 				}
-			}, pkg.MustDecode(
-				"E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C",
-			),
+			}, expectsFS{
+				".":          {Mode: fs.ModeDir | 0700},
+				"checksum":   {Mode: fs.ModeDir | 0700},
+				"identifier": {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 +86,12 @@ 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},
+			"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 +150,16 @@ 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")},
+
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 	})
 }

internal/pkg/pkg.go

@@ -617,6 +617,10 @@ 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
 )
 
 // toplevel holds [context.WithCancel] over caller-supplied context, where all

internal/pkg/pkg_test.go

@@ -16,9 +16,11 @@ import (
 	"path/filepath"
 	"reflect"
 	"strconv"
+	"strings"
 	"sync"
 	"syscall"
 	"testing"
+	"testing/fstest"
 	"unique"
 	"unsafe"
 
@@ -286,6 +288,99 @@ 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.
@@ -294,7 +389,7 @@ 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
 }
 
 // checkWithCache runs a slice of cacheTestCase.
@@ -381,15 +476,13 @@ func checkWithCache(t *testing.T, testCases []cacheTestCase) {
 			if err := os.RemoveAll(base.Append("status").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 {
-				t.Fatalf("HashDir: %v", &pkg.ChecksumMismatchError{
-					Got:  checksum,
-					Want: tc.want,
-				})
+			} else if checksum != want {
+				t.Fatal(expectsFrom(base.String()))
 			}
 
 			if err := scrubFunc(); err != nil {
@@ -408,10 +501,10 @@ 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 +518,7 @@ type cureStep struct {
 	a pkg.Artifact
 
 	pathname *check.Absolute
-	checksum pkg.Checksum
+	output   expectsKnown
 	err      error
 }
 
@@ -449,14 +542,12 @@ func cureMany(t *testing.T, c *pkg.Cache, steps []cureStep) {
 			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) {
-			if checksum == (unique.Handle[pkg.Checksum]{}) {
-				checksum = unique.Make(pkg.Checksum{})
+		} else if step.output == nil || checksum != makeChecksumH(step.output.hash()) {
+			if pathname != nil {
+				t.Fatal(expectsFrom(pathname.String()))
+			} 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 +608,12 @@ 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"
-
-	testdataChecksum := func() pkg.Checksum {
-		h := sha512.New384()
-		h.Write([]byte(testdata))
-		return (pkg.Checksum)(h.Sum(nil))
-	}()
+		"\xfe\xca\x00\x00")
 
 	testCases := []cacheTestCase{
 		{"file", pkg.CValidateKnown | pkg.CAssumeChecksum, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
@@ -551,31 +636,31 @@ func TestCache(t *testing.T) {
 				{"initial file", newStubFile(
 					pkg.KindHTTPGet,
 					identifier,
-					&testdataChecksum,
-					[]byte(testdata), nil,
-				), wantPathname, testdataChecksum, nil},
+					new(testdata.hash()),
+					testdata, nil,
+				), wantPathname, testdata, nil},
 
 				{"identical content", newStubFile(
 					pkg.KindHTTPGet,
 					identifier0,
-					&testdataChecksum,
-					[]byte(testdata), nil,
-				), wantPathname0, testdataChecksum, nil},
+					new(testdata.hash()),
+					testdata, nil,
+				), wantPathname0, testdata, nil},
 
 				{"existing entry", newStubFile(
 					pkg.KindHTTPGet,
 					identifier,
-					&testdataChecksum,
-					[]byte(testdata), nil,
-				), wantPathname, testdataChecksum, nil},
+					new(testdata.hash()),
+					testdata, nil,
+				), wantPathname, testdata, nil},
 
 				{"checksum mismatch", newStubFile(
 					pkg.KindHTTPGet,
 					pkg.ID{0xff, 0},
 					new(pkg.Checksum),
-					[]byte(testdata), nil,
-				), nil, pkg.Checksum{}, &pkg.ChecksumMismatchError{
-					Got: testdataChecksum,
+					testdata, nil,
+				), nil, nil, &pkg.ChecksumMismatchError{
+					Got: testdata.hash(),
 				}},
 
 				{"store without validation", newStubFile(
@@ -586,7 +671,7 @@ 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 +685,7 @@ 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",
 				))},
 
@@ -609,18 +694,18 @@ 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,
 				)},
 
@@ -640,7 +725,7 @@ func TestCache(t *testing.T) {
 					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}),
 						Err: struct {
@@ -662,18 +747,18 @@ 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),
-					), testdataChecksum, nil},
+						pkg.Encode(testdata.hash()),
+					), testdata, nil},
 				})
 
 				// cure after close
@@ -686,7 +771,21 @@ 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")},
+
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"directory", pkg.CAssumeChecksum, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			id := pkg.MustDecode(
@@ -721,9 +820,16 @@ func TestCache(t *testing.T) {
 					).String(),
 				)
 			}
-			wantChecksum := pkg.MustDecode(
-				"qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b",
-			)
+			want := expectsFS{
+				".": {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 +883,33 @@ 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 +918,27 @@ func TestCache(t *testing.T) {
 				{"cache hit bad type", newStubFile(
 					pkg.KindHTTPGet,
 					pkg.ID{0xff, 2},
-					&wantChecksum,
-					[]byte(testdata), nil,
-				), nil, pkg.Checksum{}, pkg.InvalidFileModeError(
+					new(want.hash()),
+					testdata, nil,
+				), 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 +948,14 @@ 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 +965,26 @@ func TestCache(t *testing.T) {
 							t.GetWorkDir().String(),
 						)
 					},
-				}}, nil, pkg.Checksum{}, pkg.InvalidFileModeError(
+				}}, nil, nil, pkg.InvalidFileModeError(
 					fs.ModeSymlink | 0777,
 				)},
 			})
-		}, pkg.MustDecode("WVpvsVqVKg9Nsh744x57h51AuWUoUR2nnh8Md-EYBQpk6ziyTuUn6PLtF2e0Eu_d")},
+		}, expectsFS{
+			".": {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},
+		}},
 
 		{"pending", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			wantErr := stub.UniqueError(0xcafe)
@@ -899,7 +1020,7 @@ 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 +1031,7 @@ func TestCache(t *testing.T) {
 							0400,
 						)
 					},
-				}}, nil, pkg.Checksum{}, errors.New(
+				}}, nil, nil, errors.New(
 					"non-file artifact produced regular file",
 				)},
 			})
@@ -932,7 +1053,12 @@ 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},
+			"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 +1111,12 @@ 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},
+			"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 +1133,12 @@ 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 +1146,16 @@ 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 +1163,21 @@ 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")},
+
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 
 		{"scrub", 0, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
 			cureMany(t, c, []cureStep{
@@ -1044,7 +1189,7 @@ 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 +1222,12 @@ 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},
+			"work":       {Mode: fs.ModeDir | 0700},
+		}},
 	}
 	checkWithCache(t, testCases)
 }
@@ -1351,7 +1501,12 @@ 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},
+			"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 +62,30 @@ func TestTar(t *testing.T) {
 				"identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
 
 				"work": {Mode: fs.ModeDir | 0700},
-			}, pkg.MustDecode(
-				"cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM",
-			))
-		}, pkg.MustDecode("NQTlc466JmSVLIyWklm_u8_g95jEEb98PxJU-kjwxLpfdjwMWJq0G8ze9R4Vo1Vu")},
+			}, want)
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"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)},
+
+			"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 +93,21 @@ 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(
-				"CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN",
-			))
-		}, pkg.MustDecode("hSoSSgCYTNonX3Q8FjvjD1fBl-E-BQyA6OTXro2OadXqbST4tZ-akGXszdeqphRe")},
+			}, wantExpand)
+		}, expectsFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"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)},
+
+			"temp": {Mode: fs.ModeDir | 0700},
+			"work": {Mode: fs.ModeDir | 0700},
+		}},
 	})
 }
 
@@ -60,7 +116,7 @@ func checkTarHTTP(
 	base *check.Absolute,
 	c *pkg.Cache,
 	testdataFsys fs.FS,
-	wantChecksum pkg.Checksum,
+	want expectsKnown,
 ) {
 	var testdata string
 	{
@@ -194,24 +250,24 @@ 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 +277,6 @@ 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/all.go

@@ -72,7 +72,13 @@ const (
 	HakureiDist
 	IPTables
 	Kmod
+	LIT
+	LibX11
 	LibXau
+	LibXext
+	LibXrandr
+	LibXrender
+	LibXxf86vm
 	Libbsd
 	Libcap
 	Libdrm
@@ -84,16 +90,19 @@ const (
 	Libiconv
 	Libmd
 	Libmnl
-	Libpciaccess
 	Libnftnl
+	Libpciaccess
+	Libpng
 	Libpsl
 	Libseccomp
 	Libtasn1
 	Libtool
 	Libucontext
 	Libunistring
+	Libxshmfence
 	Libxml2
 	Libxslt
+	Libxtrans
 	M4
 	MPC
 	MPFR
@@ -136,6 +145,7 @@ const (
 	PythonPluggy
 	PythonPyTest
 	PythonPyYAML
+	PythonPycparser
 	PythonPygments
 	PythonSetuptools
 	PythonSetuptoolsSCM
@@ -148,6 +158,7 @@ const (
 	Rsync
 	Sed
 	SPIRVHeaders
+	SPIRVLLVMTranslator
 	SPIRVTools
 	SquashfsTools
 	Strace
@@ -164,14 +175,27 @@ const (
 	XCBProto
 	XDGDBusProxy
 	XZ
-	Xproto
+	XorgProto
 	Zlib
 	Zstd
 
 	// PresetUnexportedStart is the first unexported preset.
 	PresetUnexportedStart
 
-	buildcatrust = iota - 1
+	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.

internal/rosa/cmake.go

@@ -122,6 +122,8 @@ type CMakeHelper struct {
 	// Path elements joined with source.
 	Append []string
 
+	// Value of CMAKE_BUILD_TYPE. The zero value is equivalent to "Release".
+	BuildType string
 	// CMake CACHE entries.
 	Cache []KV
 	// Runs after install.
@@ -164,14 +166,7 @@ func (*CMakeHelper) wantsDir() string { return "/cure/" }
 // script generates the cure script.
 func (attr *CMakeHelper) script(name string) string {
 	if attr == nil {
-		attr = &CMakeHelper{
-			Cache: []KV{
-				{"CMAKE_BUILD_TYPE", "Release"},
-			},
-		}
-	}
-	if len(attr.Cache) == 0 {
-		panic("CACHE must be non-empty")
+		attr = new(CMakeHelper)
 	}
 
 	generate := "Ninja"
@@ -189,6 +184,13 @@ func (attr *CMakeHelper) script(name string) string {
 		script += "\n" + test
 	}
 
+	cache := make([]KV, 1, 1+len(attr.Cache))
+	cache[0] = KV{"CMAKE_BUILD_TYPE", "Release"}
+	if attr.BuildType != "" {
+		cache[0][1] = attr.BuildType
+	}
+	cache = append(cache, attr.Cache...)
+
 	return `
 cmake -G ` + generate + ` \
 	-DCMAKE_C_COMPILER_TARGET="${ROSA_TRIPLE}" \
@@ -196,7 +198,7 @@ cmake -G ` + generate + ` \
 	-DCMAKE_ASM_COMPILER_TARGET="${ROSA_TRIPLE}" \
 	-DCMAKE_INSTALL_LIBDIR=lib \
 	` + strings.Join(slices.Collect(func(yield func(string) bool) {
-		for _, v := range attr.Cache {
+		for _, v := range cache {
 			if !yield("-D" + v[0] + "=" + v[1]) {
 				return
 			}

internal/rosa/glslang.go

@@ -17,10 +17,6 @@ func (t Toolchain) newSPIRVHeaders() (pkg.Artifact, string) {
 		"vulkan-sdk-"+version,
 		checksum,
 	), nil, &CMakeHelper{
-		Cache: []KV{
-			{"CMAKE_BUILD_TYPE", "Release"},
-		},
-
 		// upstream has no tests
 		SkipTest: true,
 	}), version
@@ -67,7 +63,6 @@ func (t Toolchain) newSPIRVTools() (pkg.Artifact, string) {
 		checksum,
 	), nil, &CMakeHelper{
 		Cache: []KV{
-			{"CMAKE_BUILD_TYPE", "Release"},
 			{"SPIRV-Headers_SOURCE_DIR", "/system"},
 		},
 	},
@@ -109,7 +104,6 @@ func (t Toolchain) newGlslang() (pkg.Artifact, string) {
 		Chmod:    true,
 	}, &CMakeHelper{
 		Cache: []KV{
-			{"CMAKE_BUILD_TYPE", "Release"},
 			{"BUILD_SHARED_LIBS", "ON"},
 			{"ALLOW_EXTERNAL_SPIRV_TOOLS", "ON"},
 		},
@@ -132,3 +126,65 @@ func init() {
 		ID: 205796,
 	}
 }
+
+func (t Toolchain) newSPIRVLLVMTranslator() (pkg.Artifact, string) {
+	const (
+		version  = "22.1.2"
+		checksum = "JZAaV5ewYcm-35YA_U2BM2IcsQouZtX1BLZR0zh2vSlfEXMsT5OCtY4Gh5RJkcGy"
+	)
+	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
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -172,5 +172,5 @@ install(
+   FILES
+     ${CMAKE_BINARY_DIR}/LLVMSPIRVLib.pc
+   DESTINATION
+-    ${CMAKE_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}/pkgconfig
++    lib${LLVM_LIBDIR_SUFFIX}/pkgconfig
+ )
+`},
+		},
+
+		// litArgs emits shell syntax
+		ScriptEarly: `
+export LIT_OPTS=` + litArgs(true,
+			// error: line 13: OpTypeCooperativeMatrixKHR Scope is limited to Workgroup and Subgroup
+			"cooperative_matrix_constant_null.spvasm") + `
+`,
+	}, &CMakeHelper{
+		Cache: []KV{
+			{"CMAKE_SKIP_BUILD_RPATH", "ON"},
+			{"BUILD_SHARED_LIBS", "ON"},
+			{"LLVM_SPIRV_ENABLE_LIBSPIRV_DIS", "ON"},
+			{"LLVM_EXTERNAL_SPIRV_HEADERS_SOURCE_DIR", "/system"},
+			{"LLVM_EXTERNAL_LIT", "/system/bin/lit"},
+			{"LLVM_INCLUDE_TESTS", "ON"},
+		},
+	},
+		Bash,
+		LIT,
+
+		SPIRVTools,
+	), version
+}
+func init() {
+	artifactsM[SPIRVLLVMTranslator] = Metadata{
+		f: Toolchain.newSPIRVLLVMTranslator,
+
+		Name:        "spirv-llvm-translator",
+		Description: "bi-directional translation between SPIR-V and LLVM IR",
+		Website:     "https://github.com/KhronosGroup/SPIRV-LLVM-Translator",
+
+		Dependencies: P{
+			SPIRVTools,
+		},
+
+		ID: 227273,
+	}
+}

internal/rosa/hakurei.go

@@ -7,9 +7,8 @@ func (t Toolchain) newHakurei(
 	withHostname bool,
 ) pkg.Artifact {
 	hostname := `
-echo '# Building test helper (hostname).'
-go build -v -o /bin/hostname /usr/src/hostname/main.go
-echo
+echo 'Building test helper (hostname).'
+go build -o /bin/hostname /usr/src/hostname/main.go
 `
 	if !withHostname {
 		hostname = ""
@@ -64,9 +63,9 @@ func init() {
 			return t.newHakurei("", `
 mkdir -p /work/system/libexec/hakurei/
 
-echo '# Building hakurei.'
-go generate -v ./...
-go build -trimpath -v -tags=rosa -o /work/system/libexec/hakurei -ldflags="-s -w
+echo "Building hakurei for $(go env GOOS)/$(go env GOARCH)."
+go generate ./...
+go build -trimpath -tags=rosa -o /work/system/libexec/hakurei -ldflags="-s -w
 	-buildid=
 	-linkmode external
 	-extldflags=-static
@@ -77,7 +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
 

internal/rosa/hakurei_release.go

@@ -4,13 +4,13 @@ package rosa
 
 import "hakurei.app/internal/pkg"
 
-const hakureiVersion = "0.4.0"
+const hakureiVersion = "0.4.1"
 
 // 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",
+	"8bHvZcjUQOXUPbKL-qq99pHFTPnn-h7j1fkJudbGs8waLm3OmkI6eHfQev5bug2y",
 	pkg.TarGzip,
 )
 

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() {
+	artifactsM[Libpng] = Metadata{
+		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/llvm.go

@@ -2,20 +2,174 @@ package rosa
 
 import (
 	"regexp"
+	"runtime"
+	"slices"
 	"strings"
 
 	"hakurei.app/internal/pkg"
 )
 
+// litArgs returns [LIT] arguments for optional verbosity and check skipping.
+func litArgs(verbose bool, skipChecks ...string) string {
+	args := []string{"-sv"}
+	if verbose {
+		args[0] = "--verbose"
+	}
+
+	if len(skipChecks) > 0 {
+		skipChecks = slices.Clone(skipChecks)
+		for i, s := range skipChecks {
+			s = regexp.QuoteMeta(s)
+			s = strings.ReplaceAll(s, "/", "\\/")
+			skipChecks[i] = s
+		}
+		args = append(args,
+			"--filter-out='\\''"+strings.Join(skipChecks, "|")+"'\\''")
+	}
+
+	return "'" + strings.Join(args, " ") + "'"
+}
+
+func (t Toolchain) newEarlyCompilerRT() (pkg.Artifact, string) {
+	version := t.Version(llvmSource)
+	major, _, _ := strings.Cut(version, ".")
+	return t.NewPackage("early-compiler-rt", version, t.Load(llvmSource), &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", "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"},
+			{"COMPILER_RT_BUILD_LIBFUZZER", "OFF"},
+			{"COMPILER_RT_BUILD_MEMPROF", "OFF"},
+			{"COMPILER_RT_BUILD_PROFILE", "OFF"},
+			{"COMPILER_RT_BUILD_XRAY", "OFF"},
+		},
+		SkipTest: true,
+		Script: `
+mkdir -p "/work/system/lib/clang/` + major + `/lib/"
+ln -s \
+	"../../../${ROSA_TRIPLE}" \
+	"/work/system/lib/clang/` + major + `/lib/"
+
+ln -s \
+	"clang_rt.crtbegin-` + linuxArch() + `.o" \
+	"/work/system/lib/${ROSA_TRIPLE}/crtbeginS.o"
+ln -s \
+	"clang_rt.crtend-` + linuxArch() + `.o" \
+	"/work/system/lib/${ROSA_TRIPLE}/crtendS.o"
+`,
+	},
+		Python,
+
+		muslHeaders,
+		KernelHeaders,
+	), version
+}
+func init() {
+	artifactsM[earlyCompilerRT] = Metadata{
+		f: Toolchain.newEarlyCompilerRT,
+
+		Name:        "early-compiler-rt",
+		Description: "early LLVM runtime: compiler-rt",
+
+		Dependencies: P{
+			Musl,
+		},
+	}
+}
+
+func (t Toolchain) newEarlyRuntimes() (pkg.Artifact, string) {
+	version := t.Version(llvmSource)
+	return t.NewPackage("early-runtimes", version, t.Load(llvmSource), &PackageAttr{
+		Flag: TExclusive,
+	}, &CMakeHelper{
+		Append: []string{"runtimes"},
+
+		Cache: []KV{
+			{"ENABLE_LINKER_BUILD_ID", "ON"},
+
+			// libc++ not yet available
+			{"CMAKE_CXX_COMPILER_WORKS", "ON"},
+
+			{"LLVM_HOST_TRIPLE", `"${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"},
+			{"LLVM_ENABLE_ZSTD", "FORCE_ON"},
+			{"LLVM_ENABLE_LIBXML2", "OFF"},
+		},
+		SkipTest: true,
+	},
+		Python,
+
+		Zlib,
+		Zstd,
+		earlyCompilerRT,
+		KernelHeaders,
+	), version
+}
+func init() {
+	artifactsM[earlyRuntimes] = Metadata{
+		f: Toolchain.newEarlyRuntimes,
+
+		Name:        "early-runtimes",
+		Description: "early LLVM runtimes: libunwind, libcxx, libcxxabi",
+
+		Dependencies: P{
+			earlyCompilerRT,
+		},
+	}
+}
+
 func (t Toolchain) newLLVM() (pkg.Artifact, string) {
-	const (
-		version  = "22.1.4"
-		checksum = "Bk3t-tV5sD5T0bqefFMcLeFuAwXnhFipywZmqst5hAZs97QQWGKB_5XyAFjj5tDB"
-	)
+	var early PArtifact = muslHeaders
+	if t.isStage0() {
+		// The LLVM build system uses the system installation when building with
+		// LLVM_LINK_LLVM_DYLIB, since it builds runtimes after the fact, using
+		// the just-built toolchain. This is unacceptable in stage0 due to the
+		// potential version difference. Later stages bootstrap off of runtimes
+		// of its previous stage via 3-stage determinism.
+		early = earlyRuntimes
+	}
 
 	cache := []KV{
-		{"CMAKE_BUILD_TYPE", "Release"},
-
 		{"ENABLE_LINKER_BUILD_ID", "ON"},
 		{"COMPILER_RT_USE_BUILTINS_LIBRARY", "ON"},
 		{"COMPILER_RT_DEFAULT_TARGET_ONLY", "ON"},
@@ -37,6 +191,7 @@ 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++"},
@@ -93,10 +248,14 @@ func (t Toolchain) newLLVM() (pkg.Artifact, string) {
 			// unwind: fails on musl
 			"eh_frame_fde_pc_range",
 		}
-		for i, s := range skipChecks {
-			s = regexp.QuoteMeta(s)
-			s = strings.ReplaceAll(s, "/", "\\/")
-			skipChecks[i] = s
+		switch runtime.GOARCH {
+		case "arm64":
+			skipChecks = append(skipChecks,
+				// LLVM: intermittently crashes
+				"ExecutionEngine/OrcLazy/multiple-compile-threads-basic.ll",
+				// unwind: unexpectedly passes
+				"unwind_leaffunction",
+			)
 		}
 
 		if presetOpts&OptLLVMNoLTO == 0 {
@@ -110,25 +269,20 @@ func (t Toolchain) newLLVM() (pkg.Artifact, string) {
 			// symbols: clock_gettime, mallopt
 			{"COMPILER_RT_INCLUDE_TESTS", "OFF"},
 
-			{"LLVM_LIT_ARGS", "'" + strings.Join([]string{
-				"--verbose",
-				"--filter-out='\\''" + strings.Join(skipChecks, "|") + "'\\''",
-			}, " ") + "'"},
+			{"LLVM_BUILD_TESTS", "ON"},
+			{"LLVM_LIT_ARGS", litArgs(true, skipChecks...)},
 		}...)
 	}
 
-	return t.NewPackage("llvm", version, t.NewPatchedSource("llvm", version, newFromGitHub(
-		"llvm/llvm-project",
-		"llvmorg-"+version,
-		checksum,
-	), true, llvmPatches...), nil, &CMakeHelper{
+	version := t.Version(llvmSource)
+	return t.NewPackage("llvm", version, t.Load(llvmSource), nil, &CMakeHelper{
 		Append: []string{"llvm"},
 
 		Cache: cache,
 		Script: `
 ln -s ld.lld /work/system/bin/ld
-
 ln -s clang /work/system/bin/cc
+ln -s clang /work/system/bin/cpp
 ln -s clang++ /work/system/bin/c++
 `,
 
@@ -159,11 +313,31 @@ ninja ` + jobsFlagE + ` check-all
 
 		Zlib,
 		Zstd,
-		muslHeaders,
+		early,
 		KernelHeaders,
 	), version
 }
 func init() {
+	const (
+		version  = "22.1.4"
+		checksum = "Bk3t-tV5sD5T0bqefFMcLeFuAwXnhFipywZmqst5hAZs97QQWGKB_5XyAFjj5tDB"
+	)
+
+	artifactsM[llvmSource] = Metadata{
+		f: func(t Toolchain) (pkg.Artifact, string) {
+			return t.NewPatchedSource("llvm", version, newFromGitHub(
+				"llvm/llvm-project",
+				"llvmorg-"+version,
+				checksum,
+			), true, llvmPatches...), version
+		},
+
+		Name:        "llvm-project",
+		Description: "LLVM monorepo with Rosa OS patches",
+
+		ID: 1830,
+	}
+
 	artifactsM[LLVM] = Metadata{
 		f: Toolchain.newLLVM,
 
@@ -176,7 +350,5 @@ func init() {
 			Zstd,
 			Musl,
 		},
-
-		ID: 1830,
 	}
 }

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
-index d525b417b4ea..fdc411f2239c 100644
+	{"path-system-libraries", `diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
+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)
-   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
+@@ -341,8 +342,12 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
    // 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/meson.go

@@ -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/musl.go

@@ -53,6 +53,23 @@ 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

internal/rosa/python.go

@@ -351,6 +351,29 @@ func init() {
 	)
 }
 
+func init() {
+	artifactsM[LIT] = Metadata{
+		f: func(t Toolchain) (pkg.Artifact, string) {
+			version := t.Version(LLVM)
+			return t.NewPackage("lit", version, t.Load(llvmSource), nil, &PipHelper{
+				Append: []string{"llvm", "utils", "lit"},
+				// already checked during llvm
+				SkipCheck: true,
+			},
+				PythonSetuptools,
+			), version
+		},
+
+		Name:        "lit",
+		Description: "a portable tool for executing LLVM and Clang style test suites",
+		Website:     "https://llvm.org/docs/CommandGuide/lit.html",
+
+		Dependencies: P{
+			Python,
+		},
+	}
+}
+
 func init() {
 	const (
 		version  = "1.1.1"
@@ -561,3 +584,24 @@ func init() {
 		}, P{PythonSetuptools},
 	)
 }
+
+func init() {
+	const (
+		version  = "3.00"
+		checksum = "4qfCMFKp0fLsRsloOAF780tXX_Ce_68RwinCmjNGObAX32WpF_iBafIKW1S1bYlA"
+	)
+	artifactsM[PythonPycparser] = newPythonPackage(
+		"pycparser", 8175,
+		"complete C99 parser in pure Python",
+		"https://github.com/eliben/pycparser",
+		version, newFromGitHub(
+			"eliben/pycparser",
+			"release_v"+version, checksum,
+		), &PackageAttr{
+			// test case hard codes gcc
+			ScriptEarly: `
+ln -s clang /system/bin/gcc
+`,
+		}, nil, P{PythonSetuptools},
+	)
+}

internal/rosa/rosa_test.go

@@ -61,7 +61,7 @@ func getCache(t *testing.T) *pkg.Cache {
 			msg := message.New(log.New(os.Stderr, "rosa: ", 0))
 			msg.SwapVerbose(true)
 
-			if buildTestCache, err = pkg.Open(ctx, msg, 0, 0, 0, a); err != nil {
+			if buildTestCache, err = pkg.Open(ctx, msg, pkg.CSuppressInit, 0, 0, a); err != nil {
 				t.Fatal(err)
 			}
 		}

internal/rosa/stage0.go

@@ -43,10 +43,11 @@ var (
 func NewStage0() pkg.Artifact {
 	stage0Once.Do(func() {
 		stage0 = newTar(
-			"https://hakurei.app/seed/20260429/"+
+			"https://hakurei.app/seed/20260504/"+
 				"stage0-"+triplet()+".tar.bz2",
 			perArch[string]{
-				"amd64": "ldz-WkSx2wxUK4ndi-tlaaU8ykOowbpGRcBsciAcIDdnX6-QfzQg_se3lsZYuzuK",
+				"amd64": "IQjFDkiAVLo1XzflgMMiLP3gnVY2hhDMTzl-QqJDCQhcLQ3lLtRzjI5WCxGyW_lk",
+				"arm64": "6fmwl2Umx2QssKQvxxb1JOGkAjzfA_MXKku0jVdGjYGb35OvwEVA5NYtd0HIy3yH",
 			}.unwrap(),
 			pkg.TarBzip2,
 		)

internal/rosa/x.go

@@ -26,19 +26,50 @@ func init() {
 	}
 }
 
-func (t Toolchain) newXproto() (pkg.Artifact, string) {
+func (t Toolchain) newLibxtrans() (pkg.Artifact, string) {
 	const (
-		version  = "7.0.31"
-		checksum = "Cm69urWY5RctKpR78eGzuwrjDEfXGkvHRdodj6sjypOGy5FF4-lmnUttVHYV1ydg"
+		version  = "1.6.0"
+		checksum = "1cxDCF59fLf1HyGDMcjR1L50ZbjD0RTTEDUpOJYcHXu6HUK_Ds0x-KREY7rLNxu9"
 	)
-	return t.NewPackage("xproto", version, newTar(
-		"https://www.x.org/releases/individual/proto/"+
-			"xproto-"+version+".tar.bz2",
+	return t.NewPackage("libxtrans", version, newFromGitLab(
+		"gitlab.freedesktop.org",
+		"xorg/lib/libxtrans",
+		"xtrans-"+version,
 		checksum,
-		pkg.TarBzip2,
 	), nil, &MakeHelper{
-		// ancient configure script
-		Generate: "autoreconf -if",
+		Generate: "NOCONFIGURE=1 ./autogen.sh",
+	},
+		Automake,
+		Libtool,
+		PkgConfig,
+
+		utilMacros,
+	), version
+}
+func init() {
+	artifactsM[Libxtrans] = Metadata{
+		f: Toolchain.newLibxtrans,
+
+		Name:        "libxtrans",
+		Description: "X Window System Protocols Transport layer shared code",
+		Website:     "https://gitlab.freedesktop.org/xorg/lib/libxtrans",
+
+		ID: 13441,
+	}
+}
+
+func (t Toolchain) newXorgProto() (pkg.Artifact, string) {
+	const (
+		version  = "2025.1"
+		checksum = "pTwJiBJHKA6Rgm3cVDXy1lyvXNIUzTRaukvvYdk1xWoJ_1G-Dfjm9MyewuyIjoHz"
+	)
+	return t.NewPackage("xorgproto", version, newFromGitLab(
+		"gitlab.freedesktop.org",
+		"xorg/proto/xorgproto",
+		"xorgproto-"+version,
+		checksum,
+	), nil, &MakeHelper{
+		Generate: "NOCONFIGURE=1 ./autogen.sh",
 	},
 		Automake,
 		PkgConfig,
@@ -47,14 +78,14 @@ func (t Toolchain) newXproto() (pkg.Artifact, string) {
 	), version
 }
 func init() {
-	artifactsM[Xproto] = Metadata{
-		f: Toolchain.newXproto,
+	artifactsM[XorgProto] = Metadata{
+		f: Toolchain.newXorgProto,
 
-		Name:        "xproto",
+		Name:        "xorgproto",
 		Description: "X Window System unified protocol definitions",
 		Website:     "https://gitlab.freedesktop.org/xorg/proto/xorgproto",
 
-		ID: 13650,
+		ID: 17190,
 	}
 }
 
@@ -77,7 +108,7 @@ func (t Toolchain) newLibXau() (pkg.Artifact, string) {
 		PkgConfig,
 
 		utilMacros,
-		Xproto,
+		XorgProto,
 	), version
 }
 func init() {
@@ -89,13 +120,301 @@ func init() {
 		Website:     "https://gitlab.freedesktop.org/xorg/lib/libxau",
 
 		Dependencies: P{
-			Xproto,
+			XorgProto,
 		},
 
 		ID: 1765,
 	}
 }
 
+func (t Toolchain) newXCBProto() (pkg.Artifact, string) {
+	const (
+		version  = "1.17.0"
+		checksum = "_NtbKaJ_iyT7XiJz25mXQ7y-niTzE8sHPvLXZPcqtNoV_-vTzqkezJ8Hp2U1enCv"
+	)
+	return t.NewPackage("xcb-proto", version, newTar(
+		"https://xcb.freedesktop.org/dist/xcb-proto-"+version+".tar.gz",
+		checksum,
+		pkg.TarGzip,
+	), nil, (*MakeHelper)(nil),
+		Python,
+	), version
+}
+func init() {
+	artifactsM[XCBProto] = Metadata{
+		f: Toolchain.newXCBProto,
+
+		Name:        "xcb-proto",
+		Description: "XML-XCB protocol descriptions used by libxcb for the X11 protocol & extensions",
+		Website:     "https://gitlab.freedesktop.org/xorg/proto/xcbproto",
+
+		ID: 13646,
+	}
+}
+
+func (t Toolchain) newXCB() (pkg.Artifact, string) {
+	const (
+		version  = "1.17.0"
+		checksum = "hjjsc79LpWM_hZjNWbDDS6qRQUXREjjekS6UbUsDq-RR1_AjgNDxhRvZf-1_kzDd"
+	)
+	return t.NewPackage("xcb", version, newTar(
+		"https://xcb.freedesktop.org/dist/libxcb-"+version+".tar.gz",
+		checksum,
+		pkg.TarGzip,
+	), nil, (*MakeHelper)(nil),
+		Python,
+		PkgConfig,
+
+		XCBProto,
+		LibXau,
+	), version
+}
+func init() {
+	artifactsM[XCB] = Metadata{
+		f: Toolchain.newXCB,
+
+		Name:        "xcb",
+		Description: "The X protocol C-language Binding",
+		Website:     "https://xcb.freedesktop.org/",
+
+		Dependencies: P{
+			XCBProto,
+			LibXau,
+		},
+
+		ID: 1767,
+	}
+}
+
+func (t Toolchain) newLibX11() (pkg.Artifact, string) {
+	const (
+		version  = "1.8.13"
+		checksum = "ARh-cuZY_U2v3DbPS1byc7ybh9NInZc-yav7SJiusk_C7408s058qWV83ocMd2pT"
+	)
+	return t.NewPackage("libX11", version, newFromGitLab(
+		"gitlab.freedesktop.org",
+		"xorg/lib/libx11",
+		"libX11-"+version,
+		checksum,
+	), nil, &MakeHelper{
+		Generate: "NOCONFIGURE=1 ./autogen.sh",
+
+		Configure: []KV{
+			{"enable-static"},
+			{"without-xmlto"},
+		},
+	},
+		Automake,
+		Libtool,
+		PkgConfig,
+
+		utilMacros,
+		Libxtrans,
+		XorgProto,
+		XCB,
+	), version
+}
+func init() {
+	artifactsM[LibX11] = Metadata{
+		f: Toolchain.newLibX11,
+
+		Name:        "libX11",
+		Description: `Core X11 protocol client library (aka "Xlib")`,
+		Website:     "https://gitlab.freedesktop.org/xorg/lib/libx11",
+
+		Dependencies: P{
+			XCB,
+		},
+
+		ID: 1764,
+	}
+}
+
+func (t Toolchain) newLibXext() (pkg.Artifact, string) {
+	const (
+		version  = "1.3.7"
+		checksum = "-0wvUDaucLPLNOrK1pcKhHNoO-5nUqQyyw6JAbhx65gRjuMiNKKaF2_tcrbC_KNq"
+	)
+	return t.NewPackage("libXext", version, newFromGitLab(
+		"gitlab.freedesktop.org",
+		"xorg/lib/libxext",
+		"libXext-"+version,
+		checksum,
+	), nil, &MakeHelper{
+		Generate: "NOCONFIGURE=1 ./autogen.sh",
+	},
+		Automake,
+		Libtool,
+		PkgConfig,
+
+		utilMacros,
+		LibX11,
+	), version
+}
+func init() {
+	artifactsM[LibXext] = Metadata{
+		f: Toolchain.newLibXext,
+
+		Name:        "libXext",
+		Description: "Xlib-based library for common extensions to the X11 protocol",
+		Website:     "https://gitlab.freedesktop.org/xorg/lib/libxext",
+
+		Dependencies: P{
+			LibX11,
+		},
+
+		ID: 1774,
+	}
+}
+
+func (t Toolchain) newLibXrender() (pkg.Artifact, string) {
+	const (
+		version  = "0.9.12"
+		checksum = "s6nWn-r17X_W-7anaS7wIcq5_Levf9zAigwJDD9Klp-cCJTVDhLo7GufuVOrxVP0"
+	)
+	return t.NewPackage("libXrender", version, newFromGitLab(
+		"gitlab.freedesktop.org",
+		"xorg/lib/libxrender",
+		"libXrender-"+version,
+		checksum,
+	), nil, &MakeHelper{
+		Generate: "NOCONFIGURE=1 ./autogen.sh",
+	},
+		Automake,
+		Libtool,
+		PkgConfig,
+
+		utilMacros,
+		LibX11,
+	), version
+}
+func init() {
+	artifactsM[LibXrender] = Metadata{
+		f: Toolchain.newLibXrender,
+
+		Name:        "libXrender",
+		Description: "Xlib library for the Render Extension to the X11 protocol",
+		Website:     "https://gitlab.freedesktop.org/xorg/lib/libxrender",
+
+		Dependencies: P{
+			LibX11,
+		},
+
+		ID: 1789,
+	}
+}
+
+func (t Toolchain) newLibxshmfence() (pkg.Artifact, string) {
+	const (
+		version  = "1.3.3"
+		checksum = "JamExTPg81By2fs3vWdeo_dzlpBQeAwXr2sDXeHJqm9XBoLW5pamiD6FgAWtAKyA"
+	)
+	return t.NewPackage("libxshmfence", version, newFromGitLab(
+		"gitlab.freedesktop.org",
+		"xorg/lib/libxshmfence",
+		"libxshmfence-"+version,
+		checksum,
+	), nil, &MakeHelper{
+		Generate: "NOCONFIGURE=1 ./autogen.sh",
+	},
+		Automake,
+		Libtool,
+		PkgConfig,
+
+		utilMacros,
+		XorgProto,
+	), version
+}
+func init() {
+	artifactsM[Libxshmfence] = Metadata{
+		f: Toolchain.newLibxshmfence,
+
+		Name:        "libxshmfence",
+		Description: "shared memory 'SyncFence' synchronization primitive",
+		Website:     "https://gitlab.freedesktop.org/xorg/lib/libxshmfence",
+
+		ID: 1792,
+	}
+}
+
+func (t Toolchain) newLibXxf86vm() (pkg.Artifact, string) {
+	const (
+		version  = "1.1.7"
+		checksum = "mS4cgKWrwz6M1Lb6Qu4ZVh8Xn2Ca_4HXPxr3LDad4iYY1LecZfeLUPW1hkp6amX_"
+	)
+	return t.NewPackage("libXxf86vm", version, newFromGitLab(
+		"gitlab.freedesktop.org",
+		"xorg/lib/libxxf86vm",
+		"libXxf86vm-"+version,
+		checksum,
+	), nil, &MakeHelper{
+		Generate: "NOCONFIGURE=1 ./autogen.sh",
+	},
+		Automake,
+		Libtool,
+		PkgConfig,
+
+		utilMacros,
+		LibXext,
+		XorgProto,
+	), version
+}
+func init() {
+	artifactsM[LibXxf86vm] = Metadata{
+		f: Toolchain.newLibXxf86vm,
+
+		Name:        "libXxf86vm",
+		Description: "Xlib-based library for the XFree86-VidMode X extension",
+		Website:     "https://gitlab.freedesktop.org/xorg/lib/libxxf86vm",
+
+		Dependencies: P{
+			LibXext,
+		},
+
+		ID: 1799,
+	}
+}
+
+func (t Toolchain) newLibXrandr() (pkg.Artifact, string) {
+	const (
+		version  = "1.5.5"
+		checksum = "OF7C7VC5MwnFue9UX5UnIkG1PIWvn9bBMq6d4mVyJJ_rcF0w4Kedn1lfxBsXEKAP"
+	)
+	return t.NewPackage("libXrandr", version, newFromGitLab(
+		"gitlab.freedesktop.org",
+		"xorg/lib/libxrandr",
+		"libXrandr-"+version,
+		checksum,
+	), nil, &MakeHelper{
+		Generate: "NOCONFIGURE=1 ./autogen.sh",
+	},
+		Automake,
+		Libtool,
+		PkgConfig,
+
+		utilMacros,
+		LibXext,
+		LibXrender,
+		XorgProto,
+	), version
+}
+func init() {
+	artifactsM[LibXrandr] = Metadata{
+		f: Toolchain.newLibXrandr,
+
+		Name:        "libXrandr",
+		Description: "Xlib Resize, Rotate and Reflection (RandR) extension library",
+		Website:     "https://gitlab.freedesktop.org/xorg/lib/libxrandr",
+
+		Dependencies: P{
+			LibXext,
+			LibXrender,
+		},
+
+		ID: 1788,
+	}
+}
+
 func (t Toolchain) newLibpciaccess() (pkg.Artifact, string) {
 	const (
 		version  = "0.19"

internal/rosa/xcb.go

@@ -1,62 +0,0 @@
-package rosa
-
-import "hakurei.app/internal/pkg"
-
-func (t Toolchain) newXCBProto() (pkg.Artifact, string) {
-	const (
-		version  = "1.17.0"
-		checksum = "_NtbKaJ_iyT7XiJz25mXQ7y-niTzE8sHPvLXZPcqtNoV_-vTzqkezJ8Hp2U1enCv"
-	)
-	return t.NewPackage("xcb-proto", version, newTar(
-		"https://xcb.freedesktop.org/dist/xcb-proto-"+version+".tar.gz",
-		checksum,
-		pkg.TarGzip,
-	), nil, (*MakeHelper)(nil),
-		Python,
-	), version
-}
-func init() {
-	artifactsM[XCBProto] = Metadata{
-		f: Toolchain.newXCBProto,
-
-		Name:        "xcb-proto",
-		Description: "XML-XCB protocol descriptions used by libxcb for the X11 protocol & extensions",
-		Website:     "https://gitlab.freedesktop.org/xorg/proto/xcbproto",
-
-		ID: 13646,
-	}
-}
-
-func (t Toolchain) newXCB() (pkg.Artifact, string) {
-	const (
-		version  = "1.17.0"
-		checksum = "hjjsc79LpWM_hZjNWbDDS6qRQUXREjjekS6UbUsDq-RR1_AjgNDxhRvZf-1_kzDd"
-	)
-	return t.NewPackage("xcb", version, newTar(
-		"https://xcb.freedesktop.org/dist/libxcb-"+version+".tar.gz",
-		checksum,
-		pkg.TarGzip,
-	), nil, (*MakeHelper)(nil),
-		Python,
-		PkgConfig,
-
-		XCBProto,
-		LibXau,
-	), version
-}
-func init() {
-	artifactsM[XCB] = Metadata{
-		f: Toolchain.newXCB,
-
-		Name:        "xcb",
-		Description: "The X protocol C-language Binding",
-		Website:     "https://xcb.freedesktop.org/",
-
-		Dependencies: P{
-			XCBProto,
-			LibXau,
-		},
-
-		ID: 1767,
-	}
-}

internal/rosa/zlib.go

@@ -13,8 +13,6 @@ func (t Toolchain) newZlib() (pkg.Artifact, string) {
 		pkg.TarGzip,
 	), nil, &CMakeHelper{
 		Cache: []KV{
-			{"CMAKE_BUILD_TYPE", "Release"},
-
 			{"CMAKE_C_FLAGS", "-fPIC"},
 			{"ZLIB_BUILD_TESTING", "ON"},
 			{"ZLIB_BUILD_SHARED", "ON"},

internal/rosa/zstd.go

@@ -19,9 +19,6 @@ func (t Toolchain) newZstd() (pkg.Artifact, string) {
 		Chmod:    true,
 	}, &CMakeHelper{
 		Append: []string{"build", "cmake"},
-		Cache: []KV{
-			{"CMAKE_BUILD_TYPE", "Release"},
-		},
 		Test: `
 make -C /usr/src/zstd/tests datagen
 ZSTD_BIN=/cure/programs/zstd /usr/src/zstd/tests/playTests.sh

options.md

@@ -35,7 +35,7 @@ package
 
 
 *Default:*
-` <derivation hakurei-static-x86_64-unknown-linux-musl-0.4.0> `
+` <derivation hakurei-static-x86_64-unknown-linux-musl-0.4.1> `
 
 
 
@@ -842,7 +842,7 @@ package
 
 
 *Default:*
-` <derivation hakurei-hsu-0.4.0> `
+` <derivation hakurei-hsu-0.4.1> `
 
 
 

package.nix

@@ -30,7 +30,7 @@
 
 buildGo126Module rec {
   pname = "hakurei";
-  version = "0.4.0";
+  version = "0.4.1";
 
   srcFiltered = builtins.path {
     name = "${pname}-src";

test/sandbox/case/device.nix

@@ -237,8 +237,8 @@ in
       (ent "/dri" "/dev/dri" "rw,nosuid" "devtmpfs" "devtmpfs" ignore)
       (ent "/var/tmp" "/var/tmp" "rw,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
       (ent "/var/cache" "/var/cache" "rw,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
-      (ent "/" "/.hakurei/.ro-store" "rw,relatime" "overlay" "overlay" "ro,lowerdir=/host/nix/.ro-store:/host/nix/.rw-store/upper,redirect_dir=nofollow,userxattr")
-      (ent "/" "/.hakurei/store" "rw,relatime" "overlay" "overlay" "rw,lowerdir=/host/nix/.ro-store:/host/nix/.rw-store/upper,upperdir=/host/tmp/.hakurei-store-rw/upper,workdir=/host/tmp/.hakurei-store-rw/work,redirect_dir=nofollow,userxattr")
+      (ent "/" "/.hakurei/.ro-store" "rw,relatime" "overlay" "overlay" "ro,lowerdir+=/host/nix/.ro-store,lowerdir+=/host/nix/.rw-store/upper,redirect_dir=nofollow,userxattr")
+      (ent "/" "/.hakurei/store" "rw,relatime" "overlay" "overlay" "rw,lowerdir+=/host/nix/.ro-store,lowerdir+=/host/nix/.rw-store/upper,upperdir=/host/tmp/.hakurei-store-rw/upper,workdir=/host/tmp/.hakurei-store-rw/work,redirect_dir=nofollow,userxattr")
       (ent "/etc" ignore "ro,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
       (ent "/var/lib/hakurei/u0/a4" "/var/lib/hakurei/u0/a4" "rw,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
       (ent ignore "/run/user/65534/pulse/native" "ro,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")

test/sandbox/case/mapuid.nix

@@ -264,8 +264,8 @@ in
       (ent "/dri" "/dev/dri" "rw,nosuid" "devtmpfs" "devtmpfs" ignore)
       (ent "/var/tmp" "/var/tmp" "rw,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
       (ent "/var/cache" "/var/cache" "rw,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
-      (ent "/" "/.hakurei/.ro-store" "rw,relatime" "overlay" "overlay" "ro,lowerdir=/host/nix/.ro-store:/host/nix/.rw-store/upper,redirect_dir=nofollow,userxattr")
-      (ent "/" "/.hakurei/store" "rw,relatime" "overlay" "overlay" "rw,lowerdir=/host/nix/.ro-store:/host/nix/.rw-store/upper,upperdir=/host/tmp/.hakurei-store-rw/upper,workdir=/host/tmp/.hakurei-store-rw/work,redirect_dir=nofollow,userxattr")
+      (ent "/" "/.hakurei/.ro-store" "rw,relatime" "overlay" "overlay" "ro,lowerdir+=/host/nix/.ro-store,lowerdir+=/host/nix/.rw-store/upper,redirect_dir=nofollow,userxattr")
+      (ent "/" "/.hakurei/store" "rw,relatime" "overlay" "overlay" "rw,lowerdir+=/host/nix/.ro-store,lowerdir+=/host/nix/.rw-store/upper,upperdir=/host/tmp/.hakurei-store-rw/upper,workdir=/host/tmp/.hakurei-store-rw/work,redirect_dir=nofollow,userxattr")
       (ent "/etc" ignore "ro,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
       (ent "/var/lib/hakurei/u0/a3" "/var/lib/hakurei/u0/a3" "rw,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
       (ent ignore "/run/user/1000/pulse/native" "ro,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")

test/sandbox/case/tty.nix

@@ -270,8 +270,8 @@ in
       (ent "/dri" "/dev/dri" "rw,nosuid" "devtmpfs" "devtmpfs" ignore)
       (ent "/var/tmp" "/var/tmp" "rw,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
       (ent "/var/cache" "/var/cache" "rw,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
-      (ent "/" "/.hakurei/.ro-store" "rw,relatime" "overlay" "overlay" "ro,lowerdir=/host/nix/.ro-store:/host/nix/.rw-store/upper,redirect_dir=nofollow,userxattr")
-      (ent "/" "/.hakurei/store" "rw,relatime" "overlay" "overlay" "rw,lowerdir=/host/nix/.ro-store:/host/nix/.rw-store/upper,upperdir=/host/tmp/.hakurei-store-rw/upper,workdir=/host/tmp/.hakurei-store-rw/work,redirect_dir=nofollow,uuid=on,userxattr")
+      (ent "/" "/.hakurei/.ro-store" "rw,relatime" "overlay" "overlay" "ro,lowerdir+=/host/nix/.ro-store,lowerdir+=/host/nix/.rw-store/upper,redirect_dir=nofollow,userxattr")
+      (ent "/" "/.hakurei/store" "rw,relatime" "overlay" "overlay" "rw,lowerdir+=/host/nix/.ro-store,lowerdir+=/host/nix/.rw-store/upper,upperdir=/host/tmp/.hakurei-store-rw/upper,workdir=/host/tmp/.hakurei-store-rw/work,redirect_dir=nofollow,uuid=on,userxattr")
       (ent "/etc" ignore "ro,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
       (ent "/var/lib/hakurei/u0/a2" "/var/lib/hakurei/u0/a2" "rw,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")
       (ent ignore "/run/user/65534/pulse/native" "ro,nosuid,nodev,relatime" "ext4" "/dev/vda" "rw")