internal/pkg: remove tar built-in decompressor

This is replaced by decompressArtifact and is no longer necessary.

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

internal/rosa/builtins.go

@@ -21,8 +21,13 @@ const (
 )
 
 // newTar wraps [pkg.NewHTTPGetTar] with a simpler function signature.
-func newTar(url, checksum string, compression uint32) pkg.Artifact {
-	return pkg.NewHTTPGetTar(nil, url, mustDecode(checksum), compression)
+func newTar(url, checksum string, compress uint32) pkg.Artifact {
+	return pkg.NewTar(
+		pkg.NewDecompress(
+			pkg.NewHTTPGet(nil, url, mustDecode(checksum)),
+			compress,
+		),
+	)
 }
 
 // newFromCPAN is a helper for downloading release from CPAN.
@@ -32,7 +37,7 @@ func newFromCPAN(author, name, version, checksum string) pkg.Artifact {
 			author[:1]+"/"+author[:2]+"/"+author+"/"+
 			name+"-"+version+".tar.gz",
 		checksum,
-		pkg.TarGzip,
+		pkg.Gzip,
 	)
 }
 
@@ -43,7 +48,7 @@ func newFromGitLab(domain, suffix, ref, checksum string) pkg.Artifact {
 			ref+"/"+path.Base(suffix)+"-"+
 			strings.ReplaceAll(ref, "/", "-")+".tar.bz2",
 		checksum,
-		pkg.TarBzip2,
+		pkg.Bzip2,
 	)
 }
 
@@ -53,7 +58,7 @@ func newFromGitHub(suffix, tag, checksum string) pkg.Artifact {
 		"https://github.com/"+suffix+
 			"/archive/refs/tags/"+tag+".tar.gz",
 		checksum,
-		pkg.TarGzip,
+		pkg.Gzip,
 	)
 }