repack-deb

#!/bin/sh

set -e

# repack-deb - Repack Debian package with xz compression algorithm

# Copyright (c) 2014, djcj <djcj@gmx.de>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.


# print usage
if [ -z "$1" ] ; then
  echo "Repack Debian package with xz compression."
  echo "Usage: $0 file.deb"
  exit 0
fi

# check if it's a file
if [ ! -f "$1" ] ; then
  echo "'$1' is not a file"
  exit 1
fi

# check for xz compression
if [ ! -z $(ar t "$1" | grep -e data.tar.xz) ] ; then
  echo "'$1' is already xz compressed"
  exit 0
fi


# extract .deb
echo "extract '$1'"
ar x "$1"


# backup .deb
echo "move '$1' to '${1}.old'"
mv "$1" "$1".old


# uncompress data.tar
d=data.tar
echo "uncompress '`ls ${d}.*`'"

if [ -f ${d}.gz ] ; then
  gunzip -f ${d}.gz
elif [ -f ${d}.bz2 ] ; then
  bunzip2 -f ${d}.bz2
elif [ -f ${d}.lzma ] ; then
  unlzma -f ${d}.lzma
fi


# compress data.tar
echo "compress (xz) '$d'"
xz $d


# create new .deb and remove temporary files

files="debian-binary control.tar.gz ${d}.xz"

echo "create '$1'"
ar rc "$1" $files

echo "remove temporary files"
rm -f $files