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 declare -r myver='@PACKAGE_VERSION@'
  30
  31 QUIET=0
  32
  33 # minimal of package before deltas are generated (bytes)
  34 min_pkg_size=$((1024*1024))
  35
  36 # percent of new package above which the delta will be discarded
  37 max_delta_size=70
  38
  39
  40 # ensure we have a sane umask set
  41 umask 0022
  42
  43 m4_include(library/parseopts.sh)
  44 m4_include(library/output_format.sh)
  45
  46 # print usage instructions
  47 usage() {
  48         printf "pkgdelta (pacman) %s\n\n" "$myver"
  49         printf -- "$(gettext "Usage: pkgdelta [options] <package1> <package2>\n")"
  50         printf -- "$(gettext "\
  51         pkgdelta will create a delta file between two packages.\n\
  52 This delta file can then be added to a database using repo-add.\n\n")"
  53         printf -- "$(gettext "Example:  pkgdelta pacman-3.0.0.pkg.tar.gz pacman-3.0.1.pkg.tar.gz")\n"
  54         echo
  55         printf -- "$(gettext "Options:\n")"
  56         printf -- "$(gettext "  -q, --quiet       minimize output\n")"
  57         printf -- "$(gettext "  --min-pkg-size    minimum package size before deltas are generated\n")"
  58         printf -- "$(gettext "  --max-delta-size  percent of new package above which the delta will be discarded\n")"
  59 }
  60
  61 version() {
  62         printf "pkgdelta (pacman) %s\n\n" "$myver"
  63         printf -- "$(gettext "\
  64 Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>.\n\n\
  65 This is free software; see the source for copying conditions.\n\
  66 There is NO WARRANTY, to the extent permitted by law.\n")"
  67 }
  68
  69 m4_include(library/human_to_size.sh)
  70
  71 isnumeric() {
  72         [[ $1 != *[!0-9]* ]]
  73 }
  74
  75 read_pkginfo()
  76 {
  77         pkgname= pkgver= arch=
  78         local OLDIFS=$IFS
  79         # IFS (field separator) is only the newline character
  80         IFS="
  81 "
  82         local line var val
  83         for line in $(bsdtar -xOqf "$1" .PKGINFO 2>/dev/null |
  84                 grep -v "^#" | sed 's|\(\w*\)\s*=\s*\(.*\)|\1="\2"|'); do
  85                 eval "$line"
  86                 if [[ -n $pkgname && -n $pkgver && -n $arch ]]; then
  87                         IFS=$OLDIFS
  88                         return 0
  89                 fi
  90         done
  91         IFS=$OLDIFS
  92         error "$(gettext "Invalid package file '%s'.")" "$1"
  93         return 1
  94 }
  95
  96 # $oldfile $oldmd5 $newfile $newmd5 $deltafile $deltamd5 $deltasize
  97 create_xdelta()
  98 {
  99         local oldfile=$1
 100         local newfile=$2
 101         local \
 102         oldname oldver oldarch \
 103         newname newver newarch \
 104         deltafile
 105
 106         read_pkginfo "$oldfile" || return 1
 107         oldname="$pkgname"
 108         oldver="$pkgver"
 109         oldarch="$arch"
 110         read_pkginfo "$newfile" || return 1
 111         newname="$pkgname"
 112         newver="$pkgver"
 113         newarch="$arch"
 114
 115         pkgsize="$(@SIZECMD@ -L "$newfile")"
 116
 117         if ((pkgsize < min_pkg_size)); then
 118                 msg "$(gettext "Skipping delta creation for small package: %s - size %s")" "$newname" "$pkgsize"
 119                 return 0
 120         fi
 121
 122         if [[ $oldname != "$newname" ]]; then
 123                 error "$(gettext "The package names don't match : '%s' and '%s'")" "$oldname" "$newname"
 124                 return 1
 125         fi
 126
 127         if [[ $oldarch != "$newarch" ]]; then
 128                 error "$(gettext "The package architectures don't match : '%s' and '%s'")" "$oldarch" "$newarch"
 129                 return 1
 130         fi
 131
 132         if [[ $oldver == "$newver" ]]; then
 133                 error "$(gettext "Both packages have the same version : '%s'")" "$newver"
 134                 return 1
 135         fi
 136
 137         msg "$(gettext "Generating delta from version %s to version %s")" "$oldver" "$newver"
 138         deltafile=$(dirname "$newfile")/$pkgname-${oldver}_to_${newver}-$arch.delta
 139         local ret=0
 140
 141         xdelta3 -q -f -s "$oldfile" "$newfile" "$deltafile" || ret=$?
 142         if (( ret )); then
 143                 error "$(gettext "Delta could not be created.")"
 144                 return 1
 145         fi
 146
 147         deltasize="$(@SIZECMD@ -L "$deltafile")"
 148
 149         if ((max_delta_size * pkgsize / 100 < deltasize)); then
 150                 msg "$(gettext "Delta package larger than maximum size. Removing.")"
 151                 rm -f "$deltafile"
 152                 return 0
 153         fi
 154
 155         msg "$(gettext "Generated delta : '%s'")" "$deltafile"
 156         (( QUIET )) && echo "$deltafile"
 157
 158         return 0
 159 }
 160
 161 OPT_SHORT='hqV'
 162 OPT_LONG=('help' 'quiet' 'max-delta-size:' 'min-pkg-size:' 'version')
 163 if ! parseopts "$OPT_SHORT" "${OPT_LONG[@]}" -- "$@"; then
 164         exit 1
 165 fi
 166 set -- "${OPTRET[@]}"
 167 unset OPT_SHORT OPT_LONG OPTRET
 168
 169 # parse arguments
 170 while :; do
 171         case $1 in
 172                 -h|--help)
 173                         usage
 174                         exit 0 ;;
 175                 -V|--version)
 176                         version
 177                         exit 0 ;;
 178                 -q|--quiet)
 179                         QUIET=1;;
 180                 --min-pkg-size)
 181                         if ! min_pkg_size=$(human_to_size "$2"); then
 182                                 echo "invalid argument '$2' for option -- '$1'"
 183                                 exit 1
 184                         fi
 185                         shift ;;
 186                 --max-delta-size)
 187                         arg=$(awk -v val="$2" 'BEGIN { print val * 100 }')
 188                         if ! isnumeric "$arg" || (( arg > 200 )); then
 189                                 echo "invalid argument '$2' for option -- '$1'"
 190                                 exit 1
 191                         fi
 192                         max_delta_size=$arg
 193                         shift ;;
 194                 --)
 195                         shift
 196                         break 2 ;;
 197         esac
 198         shift
 199 done
 200
 201 if (( $# != 2 )); then
 202         usage
 203         exit 1
 204 fi
 205
 206 for i in "$@"; do
 207         if [[ ! -f $i ]]; then
 208                 error "$(gettext "File '%s' does not exist")" "$i"
 209                 exit 1
 210         fi
 211 done
 212
 213 if ! type xdelta3 &>/dev/null; then
 214         error "$(gettext "Cannot find the xdelta3 binary! Is xdelta3 installed?")"
 215         exit 1
 216 fi
 217
 218 create_xdelta "${args[@]}"
 219
 220 # vim: set ts=2 sw=2 noet: