scripts/pkgdelta.sh.in

   1 #!/bin/bash
   2 #
   3 #   pkgdelta - create delta files for use with pacman and repo-add
   4 #   @configure_input@
   5 #
   6 #   Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>
   7 #
   8 #   This program is free software; you can redistribute it and/or modify
   9 #   it under the terms of the GNU General Public License as published by
  10 #   the Free Software Foundation; either version 2 of the License, or
  11 #   (at your option) any later version.
  12 #
  13 #   This program is distributed in the hope that it will be useful,
  14 #   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 #   GNU General Public License for more details.
  17 #
  18 #   You should have received a copy of the GNU General Public License
  19 #   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 #
  21
  22 # bash options
  23 set -o errexit
  24
  25 # gettext initialization
  26 export TEXTDOMAIN='pacman-scripts'
  27 export TEXTDOMAINDIR='@localedir@'
  28
  29 myver='@PACKAGE_VERSION@'
  30
  31 QUIET=0
  32
  33 # ensure we have a sane umask set
  34 umask 0022
  35
  36 m4_include(library/output_format.sh)
  37
  38 # print usage instructions
  39 usage() {
  40         printf "pkgdelta (pacman) %s\n\n" "$myver"
  41         printf "$(gettext "Usage: pkgdelta [-q] <package1> <package2>\n")"
  42         printf "$(gettext "\
  43         pkgdelta will create a delta file between two packages.\n\
  44 This delta file can then be added to a database using repo-add.\n\n")"
  45         echo "$(gettext "Example:  pkgdelta pacman-3.0.0.pkg.tar.gz pacman-3.0.1.pkg.tar.gz")"
  46 }
  47
  48 version() {
  49         printf "pkgdelta (pacman) %s\n\n" "$myver"
  50         printf "$(gettext "\
  51 Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>.\n\n\
  52 This is free software; see the source for copying conditions.\n\
  53 There is NO WARRANTY, to the extent permitted by law.\n")"
  54 }
  55
  56 read_pkginfo()
  57 {
  58         pkgname= pkgver= arch=
  59         local OLDIFS=$IFS
  60         # IFS (field separator) is only the newline character
  61         IFS="
  62 "
  63         local line var val
  64         for line in $(bsdtar -xOf "$1" .PKGINFO 2>/dev/null |
  65                 grep -v "^#" | sed 's|\(\w*\)\s*=\s*\(.*\)|\1="\2"|'); do
  66                 eval "$line"
  67                 if [[ -n $pkgname && -n $pkgver && -n $arch ]]; then
  68                         IFS=$OLDIFS
  69                         return 0
  70                 fi
  71         done
  72         IFS=$OLDIFS
  73         error "$(gettext "Invalid package file '%s'.")" "$1"
  74         return 1
  75 }
  76
  77 # $oldfile $oldmd5 $newfile $newmd5 $deltafile $deltamd5 $deltasize
  78 create_xdelta()
  79 {
  80         local oldfile=$1
  81         local newfile=$2
  82         local \
  83         oldname oldver oldarch \
  84         newname newver newarch \
  85         deltafile
  86
  87         read_pkginfo "$oldfile" || return 1
  88         oldname="$pkgname"
  89         oldver="$pkgver"
  90         oldarch="$arch"
  91         read_pkginfo "$newfile" || return 1
  92         newname="$pkgname"
  93         newver="$pkgver"
  94         newarch="$arch"
  95
  96         if [[ $oldname != $newname ]]; then
  97                 error "$(gettext "The package names don't match : '%s' and '%s'")" "$oldname" "$newname"
  98                 return 1
  99         fi
 100
 101         if [[ $oldarch != $newarch ]]; then
 102                 error "$(gettext "The package architectures don't match : '%s' and '%s'")" "$oldarch" "$newarch"
 103                 return 1
 104         fi
 105
 106         if [[ $oldver == $newver ]]; then
 107                 error "$(gettext "Both packages have the same version : '%s'")" "$newver"
 108                 return 1
 109         fi
 110
 111         msg "$(gettext "Generating delta from version %s to version %s")" "$oldver" "$newver"
 112         deltafile="$(dirname $newfile)/$pkgname-${oldver}_to_${newver}-$arch.delta"
 113         local ret=0
 114
 115         xdelta3 -q -f -s "$oldfile" "$newfile" "$deltafile" || ret=$?
 116         if (( ret )); then
 117                 error "$(gettext "Delta could not be created.")"
 118                 return 1
 119         else
 120                 msg "$(gettext "Generated delta : '%s'")" "$deltafile"
 121                 (( QUIET )) && echo "$deltafile"
 122         fi
 123         return 0
 124 }
 125
 126 case "$1" in
 127         -h|--help)    usage; exit 0 ;;
 128         -V|--version) version; exit 0 ;;
 129         -q|--quiet)   QUIET=1; shift ;;
 130 esac
 131
 132 if (( $# != 2 )); then
 133         usage
 134         exit 1
 135 fi
 136
 137 if [[ ! -f $1 ]]; then
 138         error "$(gettext "File '%s' does not exist")" "$1"
 139         exit 0
 140 fi
 141
 142 if [[ ! -f $2 ]]; then
 143         error "$(gettext "File '%s' does not exist")" "$2"
 144         exit 0
 145 fi
 146
 147 if ! type xdelta3 &>/dev/null; then
 148         error "$(gettext "Cannot find the xdelta3 binary! Is xdelta3 installed?")"
 149         exit 1
 150 fi
 151
 152 create_xdelta "$1" "$2"
 153
 154 # vim: set ts=2 sw=2 noet: