internal/rosa/make: migrate to helper interface

This also updates all affected artifacts to use new behaviour.

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

internal/rosa/bzip2.go

@@ -7,21 +7,22 @@ func (t Toolchain) newBzip2() pkg.Artifact {
 		version  = "1.0.8"
 		checksum = "cTLykcco7boom-s05H1JVsQi1AtChYL84nXkg_92Dm1Xt94Ob_qlMg_-NSguIK-c"
 	)
-	return t.NewViaMake("bzip2", version, pkg.NewHTTPGetTar(
+	return t.NewPackage("bzip2", version, pkg.NewHTTPGetTar(
 		nil, "https://sourceware.org/pub/bzip2/bzip2-"+version+".tar.gz",
 		mustDecode(checksum),
 		pkg.TarGzip,
-	), &MakeAttr{
-		Writable:      true,
+	), &PackageAttr{
+		Writable:    true,
+		EnterSource: true,
+	}, &MakeHelper{
+		// uses source tree as scratch space
 		SkipConfigure: true,
 		SkipCheck:     true,
 		InPlace:       true,
-
-		ScriptEarly: "cd /usr/src/bzip2",
 		Make: []string{
 			"CC=cc",
 		},
-		ScriptInstall: "make PREFIX=/work/system install",
+		Install: "make PREFIX=/work/system install",
 	})
 }
 func init() { artifactsF[Bzip2] = Toolchain.newBzip2 }