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libmakepkg: extend compress.sh to also permit checking validity

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get_compression_command() can now be used to do upfront checks for
whether a given extension is known to do something successfully. This is
useful when writing tools in which an unknown compression type is a
fatal error.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>
This commit is contained in:
Eli Schwartz 2020-08-05 10:02:09 -04:00 • committed by Allan McRae
parent 2a352dc059
commit 74aacf4495
1 changed files with 40 additions and 13 deletions
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53
scripts/libmakepkg/util/compress.sh.in
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@ -24,6 +24,7 @@ LIBMAKEPKG_UTIL_COMPRESS_SH=1
LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
source "$LIBRARY/util/message.sh"
source "$LIBRARY/util/pkgbuild.sh"
# Wrapper around many stream compression formats, for use in the middle of a
@ -31,20 +32,46 @@ source "$LIBRARY/util/message.sh"
compress_as() {
# $1: final archive filename extension for compression type detection
local ext=".tar${1##*.tar}"
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) ${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.")" \
"$ext"; cat ;;
*.tar.gz) fallback=(gzip -c -f -n) ;;
*.tar.bz2) fallback=(bzip2 -c -f) ;;
*.tar.xz) fallback=(xz -c -z -) ;;
*.tar.zst) fallback=(zstd -c -z -q -) ;;
*.tar.lrz) fallback=(lrzip -q) ;;
*.tar.lzo) fallback=(lzop -q) ;;
*.tar.Z) fallback=(compress -c -f) ;;
*.tar.lz4) fallback=(lz4 -q) ;;
*.tar.lz) fallback=(lzip -c -f) ;;
*.tar) fallback=(cat) ;;
# do not respect unknown COMPRESS* env vars
*) array_build "$outputvar" resolvecmd; return 1 ;;
esac
ext=${ext#*.tar.}
if [[ -n $ext ]]; then
extarray="COMPRESS${ext^^}[@]"
resolvecmd=("${!extarray}")
fi
if (( ${#resolvecmd[@]} == 0 )); then
resolvecmd=("${fallback[@]}")
fi
array_build "$outputvar" resolvecmd
}