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#!/bin/bash
#
# pkgdelta - create delta files for use with pacman and repo-add
# @configure_input@
#
# Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# bash options
set -o errexit
# gettext initialization
export TEXTDOMAIN='pacman-scripts'
export TEXTDOMAINDIR='@localedir@'
declare -r myver='@PACKAGE_VERSION@'
QUIET=0
# minimal of package before deltas are generated (bytes)
min_pkg_size=$((1024*1024))
# percent of new package above which the delta will be discarded
max_delta_size=70
# ensure we have a sane umask set
umask 0022
m4_include(library/parseopts.sh)
m4_include(library/output_format.sh)
# print usage instructions
usage() {
printf "pkgdelta (pacman) %s\n\n" "$myver"
printf -- "$(gettext "Usage: pkgdelta [options] <package1> <package2>\n")"
printf -- "$(gettext "\
pkgdelta will create a delta file between two packages.\n\
This delta file can then be added to a database using repo-add.\n\n")"
printf -- "$(gettext "Example: pkgdelta pacman-3.0.0.pkg.tar.gz pacman-3.0.1.pkg.tar.gz")\n"
echo
printf -- "$(gettext "Options:\n")"
printf -- "$(gettext " -q, --quiet minimize output\n")"
printf -- "$(gettext " --min-pkg-size minimum package size before deltas are generated\n")"
printf -- "$(gettext " --max-delta-size percent of new package above which the delta will be discarded\n")"
}
version() {
printf "pkgdelta (pacman) %s\n\n" "$myver"
printf -- "$(gettext "\
Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>.\n\n\
This is free software; see the source for copying conditions.\n\
There is NO WARRANTY, to the extent permitted by law.\n")"
}
m4_include(library/human_to_size.sh)
isnumeric() {
[[ $1 != *[!0-9]* ]]
}
read_pkginfo() {
while IFS='=' read -r field value; do
# skip comments and invalid lines
[[ $field = '#'* || -z $value ]] && continue
# skip lines which aren't fields we care about
[[ $field != @(pkgver|pkgname|arch) ]] || continue
declare "$field=$value"
[[ $pkgname && $pkgver && $arch ]] && return 0
done
error "$(gettext "Invalid package file '%s'.")" "$1"
return 1
}
# $oldfile $oldmd5 $newfile $newmd5 $deltafile $deltamd5 $deltasize
create_xdelta()
{
local oldfile=$1
local newfile=$2
local \
oldname oldver oldarch \
newname newver newarch \
deltafile
read_pkginfo "$oldfile" || return 1
oldname="$pkgname"
oldver="$pkgver"
oldarch="$arch"
read_pkginfo "$newfile" || return 1
newname="$pkgname"
newver="$pkgver"
newarch="$arch"
pkgsize="$(@SIZECMD@ -L "$newfile")"
if ((pkgsize < min_pkg_size)); then
msg "$(gettext "Skipping delta creation for small package: %s - size %s")" "$newname" "$pkgsize"
return 0
fi
if [[ $oldname != "$newname" ]]; then
error "$(gettext "The package names don't match : '%s' and '%s'")" "$oldname" "$newname"
return 1
fi
if [[ $oldarch != "$newarch" ]]; then
error "$(gettext "The package architectures don't match : '%s' and '%s'")" "$oldarch" "$newarch"
return 1
fi
if [[ $oldver == "$newver" ]]; then
error "$(gettext "Both packages have the same version : '%s'")" "$newver"
return 1
fi
msg "$(gettext "Generating delta from version %s to version %s")" "$oldver" "$newver"
deltafile=$(dirname "$newfile")/$pkgname-${oldver}_to_${newver}-$arch.delta
local ret=0
xdelta3 -q -f -s "$oldfile" "$newfile" "$deltafile" || ret=$?
if (( ret )); then
error "$(gettext "Delta could not be created.")"
return 1
fi
deltasize="$(@SIZECMD@ -L "$deltafile")"
if ((max_delta_size * pkgsize / 100 < deltasize)); then
msg "$(gettext "Delta package larger than maximum size. Removing.")"
rm -f "$deltafile"
return 0
fi
msg "$(gettext "Generated delta : '%s'")" "$deltafile"
(( QUIET )) && echo "$deltafile"
return 0
}
OPT_SHORT='hqV'
OPT_LONG=('help' 'quiet' 'max-delta-size:' 'min-pkg-size:' 'version')
if ! parseopts "$OPT_SHORT" "${OPT_LONG[@]}" -- "$@"; then
exit 1
fi
set -- "${OPTRET[@]}"
unset OPT_SHORT OPT_LONG OPTRET
# parse arguments
while :; do
case $1 in
-h|--help)
usage
exit 0 ;;
-V|--version)
version
exit 0 ;;
-q|--quiet)
QUIET=1;;
--min-pkg-size)
if ! min_pkg_size=$(human_to_size "$2"); then
echo "invalid argument '$2' for option -- '$1'"
exit 1
fi
shift ;;
--max-delta-size)
arg=$(awk -v val="$2" 'BEGIN { print val * 100 }')
if ! isnumeric "$arg" || (( arg > 200 )); then
echo "invalid argument '$2' for option -- '$1'"
exit 1
fi
max_delta_size=$arg
shift ;;
--)
shift
break 2 ;;
esac
shift
done
if (( $# != 2 )); then
usage
exit 1
fi
for i in "$@"; do
if [[ ! -f $i ]]; then
error "$(gettext "File '%s' does not exist")" "$i"
exit 1
fi
done
if ! type xdelta3 &>/dev/null; then
error "$(gettext "Cannot find the xdelta3 binary! Is xdelta3 installed?")"
exit 1
fi
create_xdelta "$@"
# vim: set ts=2 sw=2 noet:
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