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