internal/rosa/package: migrate toybox

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

internal/rosa/rosa.go

@@ -76,21 +76,9 @@ func (s *S) triple() string {
 	return s.linuxArch() + "-rosa-linux-musl"
 }
 
-// perArch is a value that differs per architecture.
-type perArch[T any] map[string]T
-
-// unwrap returns the value for the current architecture.
-func (p perArch[T]) unwrap(s *S) T {
-	v, ok := p[s.arch]
-	if !ok {
-		panic("unsupported target " + s.arch)
-	}
-	return v
-}
-
 const (
-	// EnvTriplet holds the return value of triplet.
-	EnvTriplet = "ROSA_TRIPLE"
+	// EnvTriple holds the Rosa OS host triple.
+	EnvTriple = "ROSA_TRIPLE"
 )
 
 // earlyLDFLAGS returns LDFLAGS corresponding to triplet.
@@ -225,16 +213,15 @@ const (
 )
 
 var (
-	// stage0Dist is a binary distribution of an initial toolchain [Stage]. It
-	// is used by [Toolchain.New] as stageEarly.
-	stage0Dist = H("stage0-dist")
-
 	// The Mksh shell is added by [Toolchain.New] and used by almost all packages.
 	Mksh = H("mksh")
 	// Toybox is standard utilities added by [Toolchain.New].
 	Toybox = H("toybox")
 	// LLVM is the standard toolchain added by [Toolchain.New].
 	LLVM = H("llvm")
+
+	_stage0Dist  = H("stage0-dist")
+	_toyboxEarly = H("toybox-early")
 )
 
 // New returns a [pkg.Artifact] based on a [Toolchain] via s.
@@ -262,7 +249,7 @@ func (t Toolchain) New(
 		support = append(support, extra...)
 		support = append(support, cureEtc{})
 		if t.stage == stageEarly {
-			_, a := t.MustLoad(stage0Dist)
+			_, a := t.MustLoad(_stage0Dist)
 			support = append(support, a)
 		} else {
 			support = append(support, t.S.New(_stageBusybox).New("gentoo", 0, nil, nil, nil, `
@@ -282,7 +269,7 @@ mkdir -vp /work/system/bin
 			)))
 		}
 		env = fixupEnviron(env, []string{
-			EnvTriplet + "=" + t.triple(),
+			EnvTriple + "=" + t.triple(),
 			lcMessages,
 			"LDFLAGS=" + t.earlyLDFLAGS(true),
 		}, "/system/bin",
@@ -297,7 +284,7 @@ mkdir -vp /work/system/bin
 
 		toybox := Toybox
 		if flag&TEarly != 0 {
-			toybox = toyboxEarly
+			toybox = _toyboxEarly
 		}
 
 		base := LLVM
@@ -313,7 +300,7 @@ mkdir -vp /work/system/bin
 			toybox,
 		))
 		env = fixupEnviron(env, []string{
-			EnvTriplet + "=" + t.triple(),
+			EnvTriple + "=" + t.triple(),
 			lcMessages,
 		}, "/system/bin", "/bin")