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#!/bin/bash
#
# compress.sh - functions to compress archives in a uniform manner
#
# Copyright (c) 2017-2020 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 "$LIBRARY/util/message.sh"
source "$LIBRARY/util/pkgbuild.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() {
# $1: final archive filename extension for compression type detection
local cmd ext=${1#${1%.tar*}}
if ! get_compression_command "$ext" cmd; then
warning "$(gettext "'%s' is not a valid archive extension.")" "${ext:-${1##*/}}"
cat
else
"${cmd[@]}"
fi
}
# Retrieve the compression command for an archive extension, or cat for .tar,
# and save it to an existing array name. If the extension cannot be found,
# clear the array and return failure.
get_compression_command() {
local extarray ext=$1 outputvar=$2
local resolvecmd=() fallback=()
case "$ext" in
*.tar.gz) fallback=(gzip -c -f -n) ;;
*.tar.bz2) fallback=(bzip2 -c -f) ;;
*.tar.xz) fallback=(xz -c -z -) ;;
*.tar.zst) fallback=(zstd -c -z -q -) ;;
*.tar.lrz) fallback=(lrzip -q) ;;
*.tar.lzo) fallback=(lzop -q) ;;
*.tar.Z) fallback=(compress -c -f) ;;
*.tar.lz4) fallback=(lz4 -q) ;;
*.tar.lz) fallback=(lzip -c -f) ;;
*.tar) fallback=(cat) ;;
# do not respect unknown COMPRESS* env vars
*) array_build "$outputvar" resolvecmd; return 1 ;;
esac
ext=${ext#*.tar.}
# empty the variable for plain tar archives so we fallback to cat
ext=${ext#*.tar}
if [[ -n $ext ]]; then
extarray="COMPRESS${ext^^}[@]"
resolvecmd=("${!extarray}")
fi
if (( ${#resolvecmd[@]} == 0 )); then
resolvecmd=("${fallback[@]}")
fi
array_build "$outputvar" resolvecmd
}
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