scripts/pkgdelta.sh.in

   1 #!@BASH_SHELL@
   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'
  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 msg() {
  38         (( QUIET )) && return
  39         local mesg=$1; shift
  40         printf "==> ${mesg}\n" "$@" >&1
  41 }
  42
  43 warning() {
  44         local mesg=$1; shift
  45         printf "==> $(gettext "WARNING:") ${mesg}\n" "$@" >&2
  46 }
  47
  48 error() {
  49         local mesg=$1; shift
  50         printf "==> $(gettext "ERROR:") ${mesg}\n" "$@" >&2
  51 }
  52
  53 # print usage instructions
  54 usage() {
  55         printf "pkgdelta (pacman) %s\n\n" "$myver"
  56         printf "$(gettext "Usage: pkgdelta [-q] <package1> <package2>\n")"
  57         printf "$(gettext "\
  58         pkgdelta will create a delta file between two packages\n\
  59 This delta file can then be added to a database using repo-add.\n\n")"
  60         echo "$(gettext "Example:  pkgdelta pacman-3.0.0.pkg.tar.gz pacman-3.0.1.pkg.tar.gz")"
  61 }
  62
  63 version() {
  64         printf "pkgdelta (pacman) %s\n\n" "$myver"
  65         printf "$(gettext "\
  66 Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>.\n\n\
  67 This is free software; see the source for copying conditions.\n\
  68 There is NO WARRANTY, to the extent permitted by law.\n")"
  69 }
  70
  71 read_pkginfo()
  72 {
  73         pkgname= pkgver= arch=
  74         local OLDIFS=$IFS
  75         # IFS (field separator) is only the newline character
  76         IFS="
  77 "
  78         local line var val
  79         for line in $(bsdtar -xOf "$1" .PKGINFO 2>/dev/null |
  80                 grep -v "^#" | sed 's|\(\w*\)\s*=\s*\(.*\)|\1="\2"|'); do
  81                 eval "$line"
  82                 if [[ -n $pkgname && -n $pkgver && -n $arch ]]; then
  83                         IFS=$OLDIFS
  84                         return 0
  85                 fi
  86         done
  87         IFS=$OLDIFS
  88         error "$(gettext "Invalid package '%s'")" "$1"
  89         return 1
  90 }
  91
  92 # $oldfile $oldmd5 $newfile $newmd5 $deltafile $deltamd5 $deltasize
  93 create_xdelta()
  94 {
  95         local oldfile=$1
  96         local newfile=$2
  97         local \
  98         oldname oldver oldarch \
  99         newname newver newarch \
 100         deltafile
 101
 102         read_pkginfo "$oldfile" || return 1
 103         oldname="$pkgname"
 104         oldver="$pkgver"
 105         oldarch="$arch"
 106         read_pkginfo "$newfile" || return 1
 107         newname="$pkgname"
 108         newver="$pkgver"
 109         newarch="$arch"
 110
 111         if [[ $oldname != $newname ]]; then
 112                 error "$(gettext "The package names don't match : '%s' and '%s'")" "$oldname" "$newname"
 113                 return 1
 114         fi
 115
 116         if [[ $oldarch != $newarch ]]; then
 117                 error "$(gettext "The package architectures don't match : '%s' and '%s'")" "$oldarch" "$newarch"
 118                 return 1
 119         fi
 120
 121         if [[ $oldver == $newver ]]; then
 122                 error "$(gettext "Both packages have the same version : '%s'")" "$newver"
 123                 return 1
 124         fi
 125
 126         msg "$(gettext "Generating delta from version %s to version %s")" "$oldver" "$newver"
 127         deltafile="$(dirname $newfile)/$pkgname-${oldver}_to_${newver}-$arch.delta"
 128         local ret=0
 129
 130         xdelta3 -q -f -s "$oldfile" "$newfile" "$deltafile" || ret=$?
 131         if (( ret )); then
 132                 error "$(gettext "Delta could not be created.")"
 133                 return 1
 134         else
 135                 msg "$(gettext "Generated delta : '%s'")" "$deltafile"
 136                 (( QUIET )) && echo "$deltafile"
 137         fi
 138         return 0
 139 }
 140
 141 case "$1" in
 142         -q|--quiet) QUIET=1; shift ;;
 143 esac
 144
 145 if (( $# != 2 )); then
 146         usage
 147         exit 0
 148 fi
 149
 150 if [[ ! -f $1 ]]; then
 151         error "$(gettext "File '%s' does not exist")" "$1"
 152         exit 0
 153 fi
 154
 155 if [[ ! -f $2 ]]; then
 156         error "$(gettext "File '%s' does not exist")" "$2"
 157         exit 0
 158 fi
 159
 160 if ! type xdelta3 &>/dev/null; then
 161         error "$(gettext "Cannot find the xdelta3 binary! Is xdelta3 installed?")"
 162         exit 1
 163 fi
 164
 165 create_xdelta "$1" "$2"