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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@'

declare -r myver='@PACKAGE_VERSION@'

QUIET=0

# minimal of package before deltas are generated (bytes)
min_pkg_size=$((1024*1024))

# percent of new package above which the delta will be discarded
max_delta_size=70


# ensure we have a sane umask set
umask 0022

m4_include(library/parseopts.sh)
m4_include(library/output_format.sh)

# print usage instructions
usage() {
  printf "pkgdelta (pacman) %s\n\n" "$myver"
  printf -- "$(gettext "Usage: pkgdelta [options] <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"
  echo
  printf -- "$(gettext "Options:\n")"
  printf -- "$(gettext "  -q, --quiet       minimize output\n")"
  printf -- "$(gettext "  --min-pkg-size    minimum package size before deltas are generated\n")"
  printf -- "$(gettext "  --max-delta-size  percent of new package above which the delta will be discarded\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")"
}

m4_include(library/human_to_size.sh)

isnumeric() {
  [[ $1 != *[!0-9]* ]]
}

read_pkginfo() {
  while IFS='=' read -r field value; do
    # skip comments and invalid lines
    [[ $field = '#'* || -z $value ]] && continue

    # skip lines which aren't fields we care about
    [[ $field != @(pkgver|pkgname|arch) ]] || continue

    declare "$field=$value"

    [[ $pkgname && $pkgver && $arch ]] && return 0
  done

  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"

  pkgsize="$(@SIZECMD@ -L "$newfile")"

  if ((pkgsize < min_pkg_size)); then
    msg "$(gettext "Skipping delta creation for small package: %s - size %s")" "$newname" "$pkgsize"
    return 0
  fi

  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
  fi

  deltasize="$(@SIZECMD@ -L "$deltafile")"

  if ((max_delta_size * pkgsize / 100 < deltasize)); then
    msg "$(gettext "Delta package larger than maximum size. Removing.")"
    rm -f "$deltafile"
    return 0
  fi

  msg "$(gettext "Generated delta : '%s'")" "$deltafile"
  (( QUIET )) && echo "$deltafile"

  return 0
}

OPT_SHORT='hqV'
OPT_LONG=('help' 'quiet' 'max-delta-size:' 'min-pkg-size:' 'version')
if ! parseopts "$OPT_SHORT" "${OPT_LONG[@]}" -- "$@"; then
  exit 1
fi
set -- "${OPTRET[@]}"
unset OPT_SHORT OPT_LONG OPTRET

# parse arguments
while :; do
  case $1 in
    -h|--help)
      usage
      exit 0 ;;
    -V|--version)
      version
      exit 0 ;;
    -q|--quiet)
      QUIET=1;;
    --min-pkg-size)
      if ! min_pkg_size=$(human_to_size "$2"); then
        echo "invalid argument '$2' for option -- '$1'"
        exit 1
      fi
      shift ;;
    --max-delta-size)
      arg=$(awk -v val="$2" 'BEGIN { print val * 100 }')
      if ! isnumeric "$arg" || (( arg > 200 )); then
        echo "invalid argument '$2' for option -- '$1'"
        exit 1
      fi
      max_delta_size=$arg
      shift ;;
    --)
      shift
      break 2 ;;
  esac
  shift
done

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

for i in "$@"; do
  if [[ ! -f $i ]]; then
    error "$(gettext "File '%s' does not exist")" "$i"
    exit 1
  fi
done

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

create_xdelta "$@"

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