internal/rosa: key metadata by string

For upcoming azalea integration. The API is quite ugly right now to ease migration.

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

internal/rosa/libcap.go

@@ -2,12 +2,12 @@ package rosa
 
 import "hakurei.app/internal/pkg"
 
-func (t Toolchain) newLibcap() (pkg.Artifact, string) {
+func (t Toolchain) newLibcap(s *S) (pkg.Artifact, string) {
 	const (
 		version  = "2.78"
 		checksum = "wFdUkBhFMD9InPnrBZyegWrlPSAg_9JiTBC-eSFyWWlmbzL2qjh2mKxr9Kx2a8ut"
 	)
-	return t.NewPackage("libcap", version, newTar(
+	return s.NewPackage(t, "libcap", version, newTar(
 		"https://git.kernel.org/pub/scm/libs/libcap/libcap.git/"+
 			"snapshot/libcap-"+version+".tar.gz",
 		checksum,
@@ -42,7 +42,7 @@ ln -s ../system/bin/bash /bin/
 	), version
 }
 func init() {
-	artifactsM[Libcap] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibcap,
 
 		Name:        "libcap",
@@ -50,5 +50,5 @@ func init() {
 		Website:     "https://sites.google.com/site/fullycapable/",
 
 		ID: 1569,
-	}
+	})
 }