#!/bin/bash # # compress.sh - functions to compress archives in a uniform manner # # Copyright (c) 2017-2021 Pacman Development Team # # 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 . # [[ -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 }