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#!@BASH_SHELL@
#
# 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 nounset
set -o errexit
# gettext initialization
export TEXTDOMAIN='pacman'
export TEXTDOMAINDIR='@localedir@'
myver='@PACKAGE_VERSION@'
QUIET=0
# ensure we have a sane umask set
umask 0022
msg() {
(( QUIET )) && return
local mesg=$1; shift
printf "==> ${mesg}\n" "$@" >&1
}
warning() {
local mesg=$1; shift
printf "==> $(gettext "WARNING:") ${mesg}\n" "$@" >&2
}
error() {
local mesg=$1; shift
printf "==> $(gettext "ERROR:") ${mesg}\n" "$@" >&2
}
# print usage instructions
usage() {
printf "pkgdelta (pacman) %s\n\n" "$myver"
printf "$(gettext "Usage: pkgdelta [-q] <package1> <package2>\n")"
printf "$(gettext "\
pkgdelta will create a delta file between two packages.\n\
This delta file can then be added to a database using repo-add.\n\n")"
echo "$(gettext "Example: pkgdelta pacman-3.0.0.pkg.tar.gz pacman-3.0.1.pkg.tar.gz")"
}
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")"
}
read_pkginfo()
{
pkgname= pkgver= arch=
local OLDIFS=$IFS
# IFS (field separator) is only the newline character
IFS="
"
local line var val
for line in $(bsdtar -xOf "$1" .PKGINFO 2>/dev/null |
grep -v "^#" | sed 's|\(\w*\)\s*=\s*\(.*\)|\1="\2"|'); do
eval "$line"
if [[ -n $pkgname && -n $pkgver && -n $arch ]]; then
IFS=$OLDIFS
return 0
fi
done
IFS=$OLDIFS
error "$(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"
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
else
msg "$(gettext "Generated delta : '%s'")" "$deltafile"
(( QUIET )) && echo "$deltafile"
fi
return 0
}
case "$1" in
-q|--quiet) QUIET=1; shift ;;
esac
if (( $# != 2 )); then
usage
exit 0
fi
if [[ ! -f $1 ]]; then
error "$(gettext "File '%s' does not exist")" "$1"
exit 0
fi
if [[ ! -f $2 ]]; then
error "$(gettext "File '%s' does not exist")" "$2"
exit 0
fi
if ! type xdelta3 &>/dev/null; then
error "$(gettext "Cannot find the xdelta3 binary! Is xdelta3 installed?")"
exit 1
fi
create_xdelta "$1" "$2"
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