internal/rosa: create metadata alongside artifact

This enables deferring evaluation of azalea-based packages and fixes the longstanding quirk of version being disjoint from other metadata.

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

internal/rosa/python.go

@@ -88,9 +88,7 @@ index 19aea290b58..51603ba9510 100644
 	), version
 }
 func init() {
-	native.MustRegister(&Artifact{
-		f: Toolchain.newPython,
-
+	native.mustRegister(Toolchain.newPython, &Metadata{
 		Name:        "python",
 		Description: "the Python programming language interpreter",
 		Website:     "https://www.python.org/",
@@ -200,15 +198,13 @@ func (s *S) newPythonPackage(
 	build P, extra ...ArtifactH,
 ) {
 	name = "python-" + name
-	s.MustRegister(&Artifact{
-		f: func(t Toolchain) (pkg.Artifact, string) {
-			return t.NewPackage(name, version, source, attrP, attr, slices.Concat(
-				P{Python},
-				extra,
-				build,
-			)...), version
-		},
-
+	s.mustRegister(func(t Toolchain) (pkg.Artifact, string) {
+		return t.NewPackage(name, version, source, attrP, attr, slices.Concat(
+			P{Python},
+			extra,
+			build,
+		)...), version
+	}, &Metadata{
 		Name:        name,
 		Description: description,
 		Website:     website,
@@ -352,18 +348,16 @@ func init() {
 }
 
 func init() {
-	native.MustRegister(&Artifact{
-		f: func(t Toolchain) (pkg.Artifact, string) {
-			source, version := t.Load(llvmSource)
-			return t.NewPackage("lit", version, source, nil, &PipHelper{
-				Append: []string{"llvm", "utils", "lit"},
-				// already checked during llvm
-				SkipCheck: true,
-			},
-				PythonSetuptools,
-			), version
+	native.mustRegister(func(t Toolchain) (pkg.Artifact, string) {
+		meta, source := t.Load(llvmSource)
+		return t.NewPackage("lit", meta.Version, source, nil, &PipHelper{
+			Append: []string{"llvm", "utils", "lit"},
+			// already checked during llvm
+			SkipCheck: true,
 		},
-
+			PythonSetuptools,
+		), meta.Version
+	}, &Metadata{
 		Name:        "lit",
 		Description: "a portable tool for executing LLVM and Clang style test suites",
 		Website:     "https://llvm.org/docs/CommandGuide/lit.html",