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 # minimal of package before deltas are generated (bytes)
  34 min_pkg_size=$((1024*1024))
  35
  36 # percent of new package above which the delta will be discarded
  37 max_delta_size=70
  38
  39
  40 # ensure we have a sane umask set
  41 umask 0022
  42
  43 m4_include(library/output_format.sh)
  44
  45 # print usage instructions
  46 usage() {
  47         printf "pkgdelta (pacman) %s\n\n" "$myver"
  48         printf -- "$(gettext "Usage: pkgdelta [options] <package1> <package2>\n")"
  49         printf -- "$(gettext "\
  50         pkgdelta will create a delta file between two packages.\n\
  51 This delta file can then be added to a database using repo-add.\n\n")"
  52         printf -- "$(gettext "Example:  pkgdelta pacman-3.0.0.pkg.tar.gz pacman-3.0.1.pkg.tar.gz")\n"
  53         echo
  54         printf -- "$(gettext "Options:\n")"
  55         printf -- "$(gettext "  -q, --quiet       minimize output\n")"
  56         printf -- "$(gettext "  --min-pkg-size    minimum package size before deltas are generated (bytes)\n")"
  57         printf -- "$(gettext "  --max-delta-size  percent of package size above which deltas will be discarded\n")"
  58 }
  59
  60 version() {
  61         printf "pkgdelta (pacman) %s\n\n" "$myver"
  62         printf -- "$(gettext "\
  63 Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>.\n\n\
  64 This is free software; see the source for copying conditions.\n\
  65 There is NO WARRANTY, to the extent permitted by law.\n")"
  66 }
  67
  68 isnumeric() {
  69         [[ $1 != *[!0-9]* ]]
  70 }
  71
  72 read_pkginfo()
  73 {
  74         pkgname= pkgver= arch=
  75         local OLDIFS=$IFS
  76         # IFS (field separator) is only the newline character
  77         IFS="
  78 "
  79         local line var val
  80         for line in $(bsdtar -xOqf "$1" .PKGINFO 2>/dev/null |
  81                 grep -v "^#" | sed 's|\(\w*\)\s*=\s*\(.*\)|\1="\2"|'); do
  82                 eval "$line"
  83                 if [[ -n $pkgname && -n $pkgver && -n $arch ]]; then
  84                         IFS=$OLDIFS
  85                         return 0
  86                 fi
  87         done
  88         IFS=$OLDIFS
  89         error "$(gettext "Invalid package file '%s'.")" "$1"
  90         return 1
  91 }
  92
  93 # $oldfile $oldmd5 $newfile $newmd5 $deltafile $deltamd5 $deltasize
  94 create_xdelta()
  95 {
  96         local oldfile=$1
  97         local newfile=$2
  98         local \
  99         oldname oldver oldarch \
 100         newname newver newarch \
 101         deltafile
 102
 103         read_pkginfo "$oldfile" || return 1
 104         oldname="$pkgname"
 105         oldver="$pkgver"
 106         oldarch="$arch"
 107         read_pkginfo "$newfile" || return 1
 108         newname="$pkgname"
 109         newver="$pkgver"
 110         newarch="$arch"
 111
 112         pkgsize="$(@SIZECMD@ -L "$newfile")"
 113
 114         if ((pkgsize < min_pkg_size)); then
 115                 msg "$(gettext "Skipping delta creation for small package: %s - size %s")" "$newname" "$pkgsize"
 116                 return 0
 117         fi
 118
 119         if [[ $oldname != "$newname" ]]; then
 120                 error "$(gettext "The package names don't match : '%s' and '%s'")" "$oldname" "$newname"
 121                 return 1
 122         fi
 123
 124         if [[ $oldarch != "$newarch" ]]; then
 125                 error "$(gettext "The package architectures don't match : '%s' and '%s'")" "$oldarch" "$newarch"
 126                 return 1
 127         fi
 128
 129         if [[ $oldver == "$newver" ]]; then
 130                 error "$(gettext "Both packages have the same version : '%s'")" "$newver"
 131                 return 1
 132         fi
 133
 134         msg "$(gettext "Generating delta from version %s to version %s")" "$oldver" "$newver"
 135         deltafile=$(dirname "$newfile")/$pkgname-${oldver}_to_${newver}-$arch.delta
 136         local ret=0
 137
 138         xdelta3 -q -f -s "$oldfile" "$newfile" "$deltafile" || ret=$?
 139         if (( ret )); then
 140                 error "$(gettext "Delta could not be created.")"
 141                 return 1
 142         fi
 143
 144         deltasize="$(@SIZECMD@ -L "$deltafile")"
 145
 146         if ((max_delta_size * pkgsize / 100 < deltasize)); then
 147                 msg "$(gettext "Delta package larger than maximum size. Removing.")"
 148                 rm -f "$deltafile"
 149                 return 0
 150         fi
 151
 152         msg "$(gettext "Generated delta : '%s'")" "$deltafile"
 153         (( QUIET )) && echo "$deltafile"
 154
 155         return 0
 156 }
 157
 158 declare -a args
 159
 160 # parse arguments
 161 while (( $# )); do
 162         case "$1" in
 163                 -h|--help)    usage; exit 0 ;;
 164                 -V|--version) version; exit 0 ;;
 165                 -q|--quiet) QUIET=1;;
 166                 --min-pkg-size)
 167                         if ! isnumeric "$2"; then
 168                                 echo "invalid argument '$2' for option -- '$1'"
 169                                 exit 1
 170                         fi
 171                         min_pkg_size=$2
 172                         shift
 173                         ;;
 174                 --max-delta-size)
 175                         arg=$(echo "$2" | awk '{print $1 * 100}')
 176                         if ! isnumeric "$arg" || (($arg > 200)); then
 177                                 echo "invalid argument '$2' for option -- '$1'"
 178                                 exit 1
 179                         fi
 180                         max_delta_size=$arg
 181                         shift
 182                         ;;
 183                 --) shift; args+=("$@"); break 2 ;;
 184                 -*) echo "invalid option -- '$1'"; usage; exit 1 ;;
 185                 *) args+=("$1");;
 186         esac
 187         shift
 188 done
 189
 190 if (( ${#args[@]} != 2 )); then
 191         usage
 192         exit 1
 193 fi
 194
 195 for i in "${args[@]}"; do
 196         if [[ ! -f $i ]]; then
 197                 error "$(gettext "File '%s' does not exist")" "$i"
 198                 exit 1
 199         fi
 200 done
 201
 202 if ! type xdelta3 &>/dev/null; then
 203         error "$(gettext "Cannot find the xdelta3 binary! Is xdelta3 installed?")"
 204         exit 1
 205 fi
 206
 207 create_xdelta "${args[@]}"
 208
 209 # vim: set ts=2 sw=2 noet: