internal/rosa: gnu tar artifact

Initially, libarchive was going to be used, but its test suite simply does not want to work under musl, not even with libiconv. The ticket last discussing this ceased any activity in 2020.

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

internal/rosa/all.go

@@ -82,6 +82,7 @@ const (
 	Setuptools
 	SquashfsTools
 	TamaGo
+	Tar
 	Texinfo
 	Toybox
 	toyboxEarly
@@ -204,6 +205,7 @@ func ResolveName(name string) (p PArtifact, ok bool) {
 		"setuptools":        Setuptools,
 		"squashfs-tools":    SquashfsTools,
 		"tamago":            TamaGo,
+		"tar":               Tar,
 		"texinfo":           Texinfo,
 		"toybox":            Toybox,
 		"unzip":             Unzip,

internal/rosa/gnu.go

@@ -419,6 +419,38 @@ func (t Toolchain) newLibiconv() pkg.Artifact {
 }
 func init() { artifactsF[Libiconv] = Toolchain.newLibiconv }
 
+func (t Toolchain) newTar() pkg.Artifact {
+	const (
+		version  = "1.35"
+		checksum = "zSaoSlVUDW0dSfm4sbL4FrXLFR8U40Fh3zY5DWhR5NCIJ6GjU6Kc4VZo2-ZqpBRA"
+	)
+	return t.NewViaMake("tar", version, pkg.NewHTTPGetTar(
+		nil, "https://ftpmirror.gnu.org/gnu/tar/tar-"+version+".tar.gz",
+		mustDecode(checksum),
+		pkg.TarGzip,
+	), &MakeAttr{
+		Env: []string{
+			// very expensive
+			"TARTEST_SKIP_LARGE_FILES=1",
+		},
+		Configure: [][2]string{
+			{"disable-acl"},
+			{"without-posix-acls"},
+			{"without-xattrs"},
+		},
+		Make: []string{
+			`TESTSUITEFLAGS="-j$(nproc)"`,
+		},
+	},
+		t.Load(Diffutils),
+
+		t.Load(Gzip),
+		t.Load(Bzip2),
+		t.Load(Zstd),
+	)
+}
+func init() { artifactsF[Tar] = Toolchain.newTar }
+
 func (t Toolchain) newBinutils() pkg.Artifact {
 	const (
 		version  = "2.45"