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#!/bin/bash
#
#   pkgdelta - create delta files for use with pacman and repo-add
#   @configure_input@
#
#   Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>
#
#   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, see <http://www.gnu.org/licenses/>.
#

# bash options
set -o errexit

# gettext initialization
export TEXTDOMAIN='pacman-scripts'
export TEXTDOMAINDIR='@localedir@'

myver='@PACKAGE_VERSION@'

QUIET=0

# ensure we have a sane umask set
umask 0022

m4_include(library/output_format.sh)

# print usage instructions
usage() {
  printf "pkgdelta (pacman) %s\n\n" "$myver"
  printf -- "$(gettext "Usage: pkgdelta [-q] <package1> <package2>\n")"
  printf -- "$(gettext "\
  pkgdelta will create a delta file between two packages.\n\
This delta file can then be added to a database using repo-add.\n\n")"
  printf -- "$(gettext "Example:  pkgdelta pacman-3.0.0.pkg.tar.gz pacman-3.0.1.pkg.tar.gz")\n"
}

version() {
  printf "pkgdelta (pacman) %s\n\n" "$myver"
  printf -- "$(gettext "\
Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>.\n\n\
This is free software; see the source for copying conditions.\n\
There is NO WARRANTY, to the extent permitted by law.\n")"
}

read_pkginfo()
{
  pkgname= pkgver= arch=
  local OLDIFS=$IFS
  # IFS (field separator) is only the newline character
  IFS="
"
  local line var val
  for line in $(bsdtar -xOf "$1" .PKGINFO 2>/dev/null |
    grep -v "^#" | sed 's|\(\w*\)\s*=\s*\(.*\)|\1="\2"|'); do
    eval "$line"
    if [[ -n $pkgname && -n $pkgver && -n $arch ]]; then
      IFS=$OLDIFS
      return 0
    fi
  done
  IFS=$OLDIFS
  error "$(gettext "Invalid package file '%s'.")" "$1"
  return 1
}

# $oldfile $oldmd5 $newfile $newmd5 $deltafile $deltamd5 $deltasize
create_xdelta()
{
  local oldfile=$1
  local newfile=$2
  local \
  oldname oldver oldarch \
  newname newver newarch \
  deltafile

  read_pkginfo "$oldfile" || return 1
  oldname="$pkgname"
  oldver="$pkgver"
  oldarch="$arch"
  read_pkginfo "$newfile" || return 1
  newname="$pkgname"
  newver="$pkgver"
  newarch="$arch"

  if [[ $oldname != "$newname" ]]; then
    error "$(gettext "The package names don't match : '%s' and '%s'")" "$oldname" "$newname"
    return 1
  fi

  if [[ $oldarch != "$newarch" ]]; then
    error "$(gettext "The package architectures don't match : '%s' and '%s'")" "$oldarch" "$newarch"
    return 1
  fi

  if [[ $oldver == "$newver" ]]; then
    error "$(gettext "Both packages have the same version : '%s'")" "$newver"
    return 1
  fi

  msg "$(gettext "Generating delta from version %s to version %s")" "$oldver" "$newver"
  deltafile="$(dirname $newfile)/$pkgname-${oldver}_to_${newver}-$arch.delta"
  local ret=0

  xdelta3 -q -f -s "$oldfile" "$newfile" "$deltafile" || ret=$?
  if (( ret )); then
    error "$(gettext "Delta could not be created.")"
    return 1
  else
    msg "$(gettext "Generated delta : '%s'")" "$deltafile"
    (( QUIET )) && echo "$deltafile"
  fi
  return 0
}

case "$1" in
  -h|--help)    usage; exit 0 ;;
  -V|--version) version; exit 0 ;;
  -q|--quiet)   QUIET=1; shift ;;
esac

if (( $# != 2 )); then
  usage
  exit 1
fi

if [[ ! -f $1 ]]; then
  error "$(gettext "File '%s' does not exist")" "$1"
  exit 0
fi

if [[ ! -f $2 ]]; then
  error "$(gettext "File '%s' does not exist")" "$2"
  exit 0
fi

if ! type xdelta3 &>/dev/null; then
  error "$(gettext "Cannot find the xdelta3 binary! Is xdelta3 installed?")"
  exit 1
fi

create_xdelta "$1" "$2"

# vim: set ts=2 sw=2 noet: