makepkg: add mtree file into package

Add an mtree file to the package with all file information. This
can be added to the local pacman database on install allowing full
package verification.

Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/makepkg.sh.in

@@ -1810,8 +1810,6 @@ create_package() {
 	done
 
 	# tar it up
-	msg2 "$(gettext "Compressing package...")"
-
 	local fullver=$(get_full_version)
 	local pkg_file="$PKGDEST/${pkgname}-${fullver}-${pkgarch}${PKGEXT}"
 	local ret=0
@@ -1822,6 +1820,14 @@ create_package() {
 	# when fileglobbing, we want * in an empty directory to expand to
 	# the null string rather than itself
 	shopt -s nullglob
+
+	msg2 "$(gettext "Generating .MTREE file...")"
+	bsdtar -czf .MTREE --format=mtree \
+		--options='!all,use-set,type,uid,gid,mode,time,size,md5,sha256,link' \
+		"${comp_files[@]}" *
+	comp_files+=(".MTREE")
+
+	msg2 "$(gettext "Compressing package...")"
 	# TODO: Maybe this can be set globally for robustness
 	shopt -s -o pipefail
 	# bsdtar's gzip compression always saves the time stamp, making one