internal/rosa: gnu patch artifact

This is more robust than the busybox implementation.

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

internal/rosa/gnu.go

@@ -140,6 +140,35 @@ make DESTDIR=/work install
 	)))
 }
 
+// NewPatch returns a [pkg.Artifact] containing an installation of GNU patch.
+func (t Toolchain) NewPatch() pkg.Artifact {
+	const (
+		version  = "2.8"
+		checksum = "MA0BQc662i8QYBD-DdGgyyfTwaeALZ1K0yusV9rAmNiIsQdX-69YC4t9JEGXZkeR"
+	)
+	return t.New("patch-"+version, []pkg.Artifact{
+		t.NewMake(),
+	}, nil, nil, `
+cd /usr/src/patch
+test_disable() { chmod +w "$2" && echo "$1" > "$2"; }
+
+test_disable '#!/bin/sh' tests/ed-style
+test_disable '#!/bin/sh' tests/need-filename
+
+cd "$(mktemp -d)"
+/usr/src/patch/configure \
+	--prefix=/system \
+	--build="${ROSA_TRIPLE}"
+make "-j$(nproc)" check
+make DESTDIR=/work install
+`, pkg.Path(AbsUsrSrc.Append("patch"), true, pkg.NewHTTPGetTar(
+		nil,
+		"https://ftp.gnu.org/gnu/patch/patch-"+version+".tar.gz",
+		mustDecode(checksum),
+		pkg.TarGzip,
+	)))
+}
+
 // NewBash returns a [pkg.Artifact] containing an installation of GNU Bash.
 func (t Toolchain) NewBash() pkg.Artifact {
 	const (