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https://github.com/Gator96100/ProxSpace.git
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81 lines
2.5 KiB
Bash
81 lines
2.5 KiB
Bash
#!/usr/bin/bash
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#
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# compress.sh - functions to compress archives in a uniform manner
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#
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# Copyright (c) 2017-2021 Pacman Development Team <pacman-dev@archlinux.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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[[ -n "$LIBMAKEPKG_UTIL_COMPRESS_SH" ]] && return
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LIBMAKEPKG_UTIL_COMPRESS_SH=1
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LIBRARY=${LIBRARY:-'/usr/share/makepkg'}
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source "$LIBRARY/util/message.sh"
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source "$LIBRARY/util/pkgbuild.sh"
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# Wrapper around many stream compression formats, for use in the middle of a
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# pipeline. A tar archive is passed on stdin and compressed to stdout.
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compress_as() {
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# $1: final archive filename extension for compression type detection
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local cmd ext=${1#${1%.tar*}}
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if ! get_compression_command "$ext" cmd; then
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warning "$(gettext "'%s' is not a valid archive extension.")" "${ext:-${1##*/}}"
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cat
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else
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"${cmd[@]}"
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fi
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}
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# Retrieve the compression command for an archive extension, or cat for .tar,
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# and save it to an existing array name. If the extension cannot be found,
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# clear the array and return failure.
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get_compression_command() {
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local extarray ext=$1 outputvar=$2
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local resolvecmd=() fallback=()
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case "$ext" in
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*.tar.gz) fallback=(gzip -c -f -n) ;;
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*.tar.bz2) fallback=(bzip2 -c -f) ;;
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*.tar.xz) fallback=(xz -c -z -) ;;
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*.tar.zst) fallback=(zstd -c -z -q -) ;;
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*.tar.lrz) fallback=(lrzip -q) ;;
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*.tar.lzo) fallback=(lzop -q) ;;
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*.tar.Z) fallback=(compress -c -f) ;;
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*.tar.lz4) fallback=(lz4 -q) ;;
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*.tar.lz) fallback=(lzip -c -f) ;;
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*.tar) fallback=(cat) ;;
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# do not respect unknown COMPRESS* env vars
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*) array_build "$outputvar" resolvecmd; return 1 ;;
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esac
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ext=${ext#*.tar.}
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# empty the variable for plain tar archives so we fallback to cat
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ext=${ext#*.tar}
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if [[ -n $ext ]]; then
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extarray="COMPRESS${ext^^}[@]"
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resolvecmd=("${!extarray}")
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fi
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if (( ${#resolvecmd[@]} == 0 )); then
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resolvecmd=("${fallback[@]}")
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fi
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array_build "$outputvar" resolvecmd
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}
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