internal/rosa: configurable architecture

This enables curing via binfmt.

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

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 (
-	// stage0 stores the tarball unpack artifact.
-	stage0 pkg.Artifact
-	// stage0Once is for lazy initialisation of stage0.
-	stage0Once sync.Once
-)
+func init() {
+	const version = "20260504"
+	artifactsM[stage0Dist] = Metadata{
+		f: func(Toolchain) (pkg.Artifact, string) {
+			return newTar(
+				"https://hakurei.app/seed/"+version+"/"+
+					"stage0-"+triplet()+".tar.bz2",
+				perArch[string]{
+					"amd64": "IQjFDkiAVLo1XzflgMMiLP3gnVY2hhDMTzl-QqJDCQhcLQ3lLtRzjI5WCxGyW_lk",
+					"arm64": "6fmwl2Umx2QssKQvxxb1JOGkAjzfA_MXKku0jVdGjYGb35OvwEVA5NYtd0HIy3yH",
+				}.unwrap(),
+				pkg.TarBzip2,
+			), 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,
-		)
-	})
-	return stage0
+		Name:        "stage0-dist",
+		Description: "Rosa OS stage0 bootstrap seed",
+	}
 }