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/libev.go

@@ -2,19 +2,19 @@ package rosa
 
 import "hakurei.app/internal/pkg"
 
-func (t Toolchain) newLibev() (pkg.Artifact, string) {
+func (t Toolchain) newLibev(s *S) (pkg.Artifact, string) {
 	const (
 		version  = "4.33"
 		checksum = "774eSXV_4k8PySRprUDChbEwsw-kzjIFnJ3MpNOl5zDpamBRvC3BqPyRxvkwcL6_"
 	)
-	return t.NewPackage("libev", version, newTar(
+	return s.NewPackage(t, "libev", version, newTar(
 		"https://dist.schmorp.de/libev/Attic/libev-"+version+".tar.gz",
 		checksum,
 		pkg.TarGzip,
 	), nil, (*MakeHelper)(nil)), version
 }
 func init() {
-	artifactsM[Libev] = Metadata{
+	native.MustRegister(&Artifact{
 		f: Toolchain.newLibev,
 
 		Name:        "libev",
@@ -22,5 +22,5 @@ func init() {
 		Website:     "http://libev.schmorp.de/",
 
 		ID: 1605,
-	}
+	})
 }