makepkg: refactor archive compression for reusability

This allows for more easily extending the list of allowed compression
methods, as it has to be modified in only one place.

Also allow the user to specify their own preferred command + options for
source packages in addition to compiled packages. Currently,
makepkg.conf(5) erroneously claims this is already possible.

1 files changed, 47 insertions, 0 deletions

diff --git a/scripts/libmakepkg/util/compress.sh.in b/scripts/libmakepkg/util/compress.sh.in
new file mode 100644
index 00000000..4e020e7f
--- /dev/null
+++ b/scripts/libmakepkg/util/compress.sh.in
@@ -0,0 +1,47 @@
+#!/bin/bash
+#
+#   compress.sh - functions to compress archives in a uniform manner
+#
+#   Copyright (c) 2017 Pacman Development Team <pacman-dev@archlinux.org>
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[[ -n "$LIBMAKEPKG_UTIL_COMPRESS_SH" ]] && return
+LIBMAKEPKG_UTIL_COMPRESS_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/message.sh"
+
+
+# Wrapper around many stream compression formats, for use in the middle of a
+# pipeline. A tar archive is passed on stdin and compressed to stdout.
+compress_as() {
+       # $1: final archive filename extension for compression type detection
+
+	local filename="$1"
+
+	case "$filename" in
+		*tar.gz)  ${COMPRESSGZ[@]:-gzip -c -f -n} ;;
+		*tar.bz2) ${COMPRESSBZ2[@]:-bzip2 -c -f} ;;
+		*tar.xz)  ${COMPRESSXZ[@]:-xz -c -z -} ;;
+		*tar.lrz) ${COMPRESSLRZ[@]:-lrzip -q} ;;
+		*tar.lzo) ${COMPRESSLZO[@]:-lzop -q} ;;
+		*tar.Z)   ${COMPRESSZ[@]:-compress -c -f} ;;
+		*tar)     cat ;;
+		*) warning "$(gettext "'%s' is not a valid archive extension.")" \
+			"$ext"; cat ;;
+	esac
+}