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#!/bin/sh
#
#   re-pacman: regenerate a pacman package based on installed files and the
#   pacman database entries.  Useful for reuse, or possible config file
#   extension
#  
#   Copyright (c) 2006 Aaron Griffin <aaron@archlinux.org>
#  
#   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, write to the Free Software
#   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
#   USA.
#

#TODO
#   * Check for md5 changes in backup lines and change pkgrel

pacinfo ()
{
    [ $# -ne 2 ] && return 1
    #use echo to strip spaces
    echo $(pacman -Qi ${1} | grep "${2}" | cut -d: -f2-)
}

make_pkginfo ()
{
    echo "# Generated by re-pacman 1.0.0"
    echo "# On $(date)"
    echo "pkgname =$(pacinfo ${1} Name)"
    echo "pkgver =$(pacinfo ${1} Version)"
    echo "pkgdesc =$(pacinfo ${1} Description)"
    echo "url =$(pacinfo ${1} URL)"
    echo "builddate =$(pacinfo ${1} 'Build Date')"
    echo "packager =$(pacinfo ${1} Packager)"
    echo "size =$(pacinfo ${1} Size)"
    echo "arch =$(pacinfo ${1} Architecture)"
    deps=$(pacinfo ${1} 'Depends On')
    for d in ${deps}; do
        echo "depend = ${d}"
    done
}

if [ $# -ne 1 ]; then
    echo "usage: re-pacman <installed package name>"
    exit 1
fi

ver=$(pacinfo ${1} Version)
if [ "x${ver}" = "x" ]; then
    echo "Package '${1}' not found, aborting."
    exit 1
fi

echo ":: Cleaning up old files"
rm -f .PKGINFO .FILELIST "${1}-${ver}.pkg.tar.gz"

echo ":: Building PKGINFO"
make_pkginfo ${1} > .PKGINFO
echo ":: Building FILELIST"
pacman -Ql ${1} | cut -d' ' -f2- > .FILELIST

flist=".PKGINFO .FILELIST"
flist="${flist} $(pacman -Ql ${1} | sed 's|\w* \(.*\)|/\1|g' | grep -v '/$')"

echo ":: Building final package tarball"
echo ${flist} | tr ' ' '\n' | tar czf "${1}-${ver}.pkg.tar.gz" -T - 2>/dev/null

rm -f .PKGINFO .FILELIST
echo ":: Package '${1}-${ver}.pkg.tar.gz' is now ready for installation"