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#!/bin/bash
#
# compress.sh - functions to compress archives in a uniform manner
#
# Copyright (c) 2017-2018 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() {
# $1: final archive filename extension for compression type detection
local ext=".tar${1##*.tar}"
case "$ext" in
*.tar.gz) ${COMPRESSGZ[@]:-gzip -c -f -n} ;;
*.tar.bz2) ${COMPRESSBZ2[@]:-bzip2 -c -f} ;;
*.tar.xz) ${COMPRESSXZ[@]:-xz -c -z -} ;;
*.tar.zst) ${COMPRESSZST[@]:-zstd -c -z -q -} ;;
*.tar.lrz) ${COMPRESSLRZ[@]:-lrzip -q} ;;
*.tar.lzo) ${COMPRESSLZO[@]:-lzop -q} ;;
*.tar.Z) ${COMPRESSZ[@]:-compress -c -f} ;;
*.tar.lz4) ${COMPRESSLZ4[@]:-lz4 -q} ;;
*.tar.lz) ${COMPRESSLZ[@]:-lzip -c -f} ;;
*.tar) cat ;;
*) warning "$(gettext "'%s' is not a valid archive extension.")" \
"$ext"; cat ;;
esac
}
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