forked from josch/mmdebstrap
60 lines
1.3 KiB
Text
60 lines
1.3 KiB
Text
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#!/bin/sh
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set -ef
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# assume that both data.tar and control.tar are compressed with same compressor
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# if dpkg-deb can handle control.tar.* then it will handle data.tar.* too
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if dpkg-deb --ctrl-tarfile "$1" >/dev/null 2>&1 ; then
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exec dpkg-deb --fsys-tarfile "$1"
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fi
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# here we're unpacking data.tar.* manually
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me=${0##*/}
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log() { echo "${me}: $*" 1>&2 ; }
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have_cmd() {
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if ! command -v "$1" >/dev/null ; then
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log "unable to find '$1' - install package '$2' first"
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exit 1
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fi
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}
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have_cmd ar binutils
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# naive test for .deb file
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ar t "$1" >/dev/null
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data_tar=
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while read -r pkg_member ; do
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[ -n "${pkg_member}" ] || continue
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if [ -n "${data_tar}" ] ; then
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log "extra data tarball '${pkg_member}' in package $1 - bailing out"
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exit 1
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fi
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data_tar="${pkg_member}"
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done <<-EOF
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$(ar t "$1" | grep -E '^data\.tar')
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EOF
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if [ -z "${data_tar}" ] ; then
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log "unable to find data.tar.* in $1 - bailing out"
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exit 1
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fi
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decomp= ; decomp_pkg=
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case "${data_tar}" in
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data.tar.gz) decomp='gzip' decomp_pkg='gzip' ;;
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data.tar.xz) decomp='xz' decomp_pkg='xz-utils' ;;
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data.tar.zst) decomp='zstd' decomp_pkg='zstd' ;;
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*)
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log "unable to handle '${data_tar}' from $1 - compression type isn't known to script"
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exit 1
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;;
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esac
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have_cmd ${decomp} ${decomp_pkg}
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ar p "$1" "${data_tar}" | ${decomp} -d
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