internal/rosa: configurable architecture

This enables curing via binfmt.

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

internal/rosa/all.go

@@ -183,7 +183,8 @@ const (
 	// PresetUnexportedStart is the first unexported preset.
 	PresetUnexportedStart
 
-	llvmSource = iota - 1
+	stage0Dist = iota - 1
+	llvmSource
 	// earlyCompilerRT is an early, standalone compiler-rt installation for the
 	// standalone runtimes build.
 	//

internal/rosa/busybox.go

@@ -5,7 +5,6 @@ import (
 	"io"
 	"net/http"
 	"os"
-	"runtime"
 	"time"
 
 	"hakurei.app/fhs"
@@ -88,7 +87,7 @@ func (a busyboxBin) Cure(t *pkg.TContext) (err error) {
 // the https://busybox.net/downloads/binaries/ binary release.
 func newBusyboxBin() pkg.Artifact {
 	var version, url, checksum string
-	switch runtime.GOARCH {
+	switch arch {
 	case "amd64":
 		version = "1.35.0"
 		url = "https://busybox.net/downloads/binaries/" +
@@ -101,7 +100,7 @@ func newBusyboxBin() pkg.Artifact {
 		checksum = "npJjBO7iwhjW6Kx2aXeSxf8kXhVgTCDChOZTTsI8ZfFfa3tbsklxRiidZQdrVERg"
 
 	default:
-		panic("unsupported target " + runtime.GOARCH)
+		panic("unsupported target " + arch)
 	}
 
 	return pkg.NewExec(

internal/rosa/gnu.go

@@ -1,7 +1,6 @@
 package rosa
 
 import (
-	"runtime"
 	"slices"
 	"strconv"
 	"strings"
@@ -843,7 +842,7 @@ func (t Toolchain) newGnuTLS() (pkg.Artifact, string) {
 	)
 
 	var configureExtra []KV
-	switch runtime.GOARCH {
+	switch arch {
 	case "arm64":
 		configureExtra = []KV{
 			{"disable-hardware-acceleration"},
@@ -1148,7 +1147,7 @@ func (t Toolchain) newGCC() (pkg.Artifact, string) {
 	)
 
 	var configureExtra []KV
-	switch runtime.GOARCH {
+	switch arch {
 	case "amd64", "arm64":
 		configureExtra = append(configureExtra, KV{"with-multilib-list", "''"})
 	}

internal/rosa/go.go

@@ -1,7 +1,6 @@
 package rosa
 
 import (
-	"runtime"
 	"slices"
 
 	"hakurei.app/internal/pkg"
@@ -69,7 +68,7 @@ func (t Toolchain) newGoLatest() (pkg.Artifact, string) {
 
 		finalEnv []string
 	)
-	switch runtime.GOARCH {
+	switch arch {
 	case "amd64":
 		bootstrapExtra = append(bootstrapExtra, t.newGoBootstrap())
 
@@ -79,7 +78,7 @@ func (t Toolchain) newGoLatest() (pkg.Artifact, string) {
 		finalEnv = append(finalEnv, "CGO_ENABLED=0")
 
 	default:
-		panic("unsupported target " + runtime.GOARCH)
+		panic("unsupported target " + arch)
 	}
 
 	go119 := t.newGo(
@@ -104,7 +103,7 @@ echo \
 		[]string{"CGO_ENABLED=0"}, `
 sed -i \
 	's,/lib/ld-musl-`+linuxArch()+`.so.1,/system/bin/linker,' \
-	cmd/link/internal/`+runtime.GOARCH+`/obj.go
+	cmd/link/internal/`+arch+`/obj.go
 
 rm \
 	crypto/tls/handshake_client_test.go \
@@ -122,7 +121,7 @@ echo \
 		[]string{"CGO_ENABLED=0"}, `
 sed -i \
 	's,/lib/ld-musl-`+linuxArch()+`.so.1,/system/bin/linker,' \
-	cmd/link/internal/`+runtime.GOARCH+`/obj.go
+	cmd/link/internal/`+arch+`/obj.go
 `, go121,
 	)
 
@@ -132,7 +131,7 @@ sed -i \
 		[]string{"CGO_ENABLED=0"}, `
 sed -i \
 	's,/lib/ld-musl-`+linuxArch()+`.so.1,/system/bin/linker,' \
-	cmd/link/internal/`+runtime.GOARCH+`/obj.go
+	cmd/link/internal/`+arch+`/obj.go
 
 rm \
 	os/root_unix_test.go \
@@ -150,7 +149,7 @@ rm \
 		finalEnv, `
 sed -i \
 	's,/lib/ld-musl-`+linuxArch()+`.so.1,/system/bin/linker,' \
-	cmd/link/internal/`+runtime.GOARCH+`/obj.go
+	cmd/link/internal/`+arch+`/obj.go
 sed -i \
 	's/cpu.X86.HasAVX512VBMI/& \&\& cpu.X86.HasPOPCNT/' \
 	internal/runtime/gc/scan/scan_amd64.go

internal/rosa/llvm.go

@@ -2,7 +2,6 @@ package rosa
 
 import (
 	"regexp"
-	"runtime"
 	"slices"
 	"strings"
 
@@ -248,7 +247,7 @@ func (t Toolchain) newLLVM() (pkg.Artifact, string) {
 			// unwind: fails on musl
 			"eh_frame_fde_pc_range",
 		}
-		switch runtime.GOARCH {
+		switch arch {
 		case "arm64":
 			skipChecks = append(skipChecks,
 				// LLVM: intermittently crashes

internal/rosa/rosa.go

@@ -4,7 +4,6 @@ package rosa
 import (
 	"errors"
 	"path"
-	"runtime"
 	"slices"
 	"strconv"
 	"strings"
@@ -54,10 +53,9 @@ var (
 	AbsSystem = fhs.AbsRoot.Append("system")
 )
 
-// linuxArch returns the architecture name used by linux corresponding to
+// linuxArch returns the architecture name used by linux corresponding to arch.
-// [runtime.GOARCH].
 func linuxArch() string {
-	switch runtime.GOARCH {
+	switch arch {
 	case "amd64":
 		return "x86_64"
 	case "arm64":
@@ -66,11 +64,11 @@ func linuxArch() string {
 		return "riscv64"
 
 	default:
-		panic("unsupported target " + runtime.GOARCH)
+		panic("unsupported target " + arch)
 	}
 }
 
-// triplet returns the Rosa OS host triple corresponding to [runtime.GOARCH].
+// triplet returns the Rosa OS host triple corresponding to arch.
 func triplet() string {
 	return linuxArch() + "-rosa-linux-musl"
 }
@@ -80,9 +78,9 @@ type perArch[T any] map[string]T
 
 // unwrap returns the value for the current architecture.
 func (p perArch[T]) unwrap() T {
-	v, ok := p[runtime.GOARCH]
+	v, ok := p[arch]
 	if !ok {
-		panic("unsupported target " + runtime.GOARCH)
+		panic("unsupported target " + arch)
 	}
 	return v
 }
@@ -268,7 +266,7 @@ func (t Toolchain) New(
 		support = append(support, extra...)
 		support = append(support, cureEtc{})
 		if t == toolchainStage0 {
-			support = append(support, NewStage0())
+			support = append(support, t.Load(stage0Dist))
 		} else {
 			support = append(support, _toolchainBusybox.New("gentoo", 0, nil, nil, nil, `
 tar -C /work -xf /usr/src/stage3.tar.xz

internal/rosa/stage0.go

@@ -1,8 +1,6 @@
 package rosa
 
 import (
-	"sync"
-
 	"hakurei.app/fhs"
 	"hakurei.app/internal/pkg"
 )
@@ -32,25 +30,22 @@ func init() {
 	}
 }
 
-var (
+func init() {
-	// stage0 stores the tarball unpack artifact.
+	const version = "20260504"
-	stage0 pkg.Artifact
+	artifactsM[stage0Dist] = Metadata{
-	// stage0Once is for lazy initialisation of stage0.
+		f: func(Toolchain) (pkg.Artifact, string) {
-	stage0Once sync.Once
+			return newTar(
-)
+				"https://hakurei.app/seed/"+version+"/"+
-
-// NewStage0 returns a stage0 distribution created from curing [Stage0].
-func NewStage0() pkg.Artifact {
-	stage0Once.Do(func() {
-		stage0 = newTar(
-			"https://hakurei.app/seed/20260504/"+
 					"stage0-"+triplet()+".tar.bz2",
 				perArch[string]{
 					"amd64": "IQjFDkiAVLo1XzflgMMiLP3gnVY2hhDMTzl-QqJDCQhcLQ3lLtRzjI5WCxGyW_lk",
 					"arm64": "6fmwl2Umx2QssKQvxxb1JOGkAjzfA_MXKku0jVdGjYGb35OvwEVA5NYtd0HIy3yH",
 				}.unwrap(),
 				pkg.TarBzip2,
-		)
+			), version
-	})
+		},
-	return stage0
+
+		Name:        "stage0-dist",
+		Description: "Rosa OS stage0 bootstrap seed",
+	}
 }

internal/rosa/tamago.go

@@ -1,10 +1,6 @@
 package rosa
 
-import (
+import "hakurei.app/internal/pkg"
-	"runtime"
-
-	"hakurei.app/internal/pkg"
-)
 
 func (t Toolchain) newTamaGo() (pkg.Artifact, string) {
 	const (
@@ -26,7 +22,7 @@ chmod -R +w ..
 
 sed -i \
 	's,/lib/ld-musl-`+linuxArch()+`.so.1,/system/bin/linker,' \
-	cmd/link/internal/`+runtime.GOARCH+`/obj.go
+	cmd/link/internal/`+arch+`/obj.go
 sed -i \
 	's/cpu.X86.HasAVX512VBMI/& \&\& cpu.X86.HasPOPCNT/' \
 	internal/runtime/gc/scan/scan_amd64.go