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 nounset
  24 set -o errexit
  25
  26 # gettext initialization
  27 export TEXTDOMAIN='pacman-scripts'
  28 export TEXTDOMAINDIR='@localedir@'
  29
  30 myver='@PACKAGE_VERSION@'
  31
  32 QUIET=0
  33
  34 # ensure we have a sane umask set
  35 umask 0022
  36
  37 m4_include(library/output_format.sh)
  38
  39 # print usage instructions
  40 usage() {
  41         printf "pkgdelta (pacman) %s\n\n" "$myver"
  42         printf "$(gettext "Usage: pkgdelta [-q] <package1> <package2>\n")"
  43         printf "$(gettext "\
  44         pkgdelta will create a delta file between two packages.\n\
  45 This delta file can then be added to a database using repo-add.\n\n")"
  46         echo "$(gettext "Example:  pkgdelta pacman-3.0.0.pkg.tar.gz pacman-3.0.1.pkg.tar.gz")"
  47 }
  48
  49 version() {
  50         printf "pkgdelta (pacman) %s\n\n" "$myver"
  51         printf "$(gettext "\
  52 Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>.\n\n\
  53 This is free software; see the source for copying conditions.\n\
  54 There is NO WARRANTY, to the extent permitted by law.\n")"
  55 }
  56
  57 read_pkginfo()
  58 {
  59         pkgname= pkgver= arch=
  60         local OLDIFS=$IFS
  61         # IFS (field separator) is only the newline character
  62         IFS="
  63 "
  64         local line var val
  65         for line in $(bsdtar -xOf "$1" .PKGINFO 2>/dev/null |
  66                 grep -v "^#" | sed 's|\(\w*\)\s*=\s*\(.*\)|\1="\2"|'); do
  67                 eval "$line"
  68                 if [[ -n $pkgname && -n $pkgver && -n $arch ]]; then
  69                         IFS=$OLDIFS
  70                         return 0
  71                 fi
  72         done
  73         IFS=$OLDIFS
  74         error "$(gettext "Invalid package file '%s'.")" "$1"
  75         return 1
  76 }
  77
  78 # $oldfile $oldmd5 $newfile $newmd5 $deltafile $deltamd5 $deltasize
  79 create_xdelta()
  80 {
  81         local oldfile=$1
  82         local newfile=$2
  83         local \
  84         oldname oldver oldarch \
  85         newname newver newarch \
  86         deltafile
  87
  88         read_pkginfo "$oldfile" || return 1
  89         oldname="$pkgname"
  90         oldver="$pkgver"
  91         oldarch="$arch"
  92         read_pkginfo "$newfile" || return 1
  93         newname="$pkgname"
  94         newver="$pkgver"
  95         newarch="$arch"
  96
  97         if [[ $oldname != $newname ]]; then
  98                 error "$(gettext "The package names don't match : '%s' and '%s'")" "$oldname" "$newname"
  99                 return 1
 100         fi
 101
 102         if [[ $oldarch != $newarch ]]; then
 103                 error "$(gettext "The package architectures don't match : '%s' and '%s'")" "$oldarch" "$newarch"
 104                 return 1
 105         fi
 106
 107         if [[ $oldver == $newver ]]; then
 108                 error "$(gettext "Both packages have the same version : '%s'")" "$newver"
 109                 return 1
 110         fi
 111
 112         msg "$(gettext "Generating delta from version %s to version %s")" "$oldver" "$newver"
 113         deltafile="$(dirname $newfile)/$pkgname-${oldver}_to_${newver}-$arch.delta"
 114         local ret=0
 115
 116         xdelta3 -q -f -s "$oldfile" "$newfile" "$deltafile" || ret=$?
 117         if (( ret )); then
 118                 error "$(gettext "Delta could not be created.")"
 119                 return 1
 120         else
 121                 msg "$(gettext "Generated delta : '%s'")" "$deltafile"
 122                 (( QUIET )) && echo "$deltafile"
 123         fi
 124         return 0
 125 }
 126
 127 case "$1" in
 128         -q|--quiet) QUIET=1; shift ;;
 129 esac
 130
 131 if (( $# != 2 )); then
 132         usage
 133         exit 0
 134 fi
 135
 136 if [[ ! -f $1 ]]; then
 137         error "$(gettext "File '%s' does not exist")" "$1"
 138         exit 0
 139 fi
 140
 141 if [[ ! -f $2 ]]; then
 142         error "$(gettext "File '%s' does not exist")" "$2"
 143         exit 0
 144 fi
 145
 146 if ! type xdelta3 &>/dev/null; then
 147         error "$(gettext "Cannot find the xdelta3 binary! Is xdelta3 installed?")"
 148         exit 1
 149 fi
 150
 151 create_xdelta "$1" "$2"
 152
 153 # vim: set ts=2 sw=2 noet: