#!/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@' myver='@PACKAGE_VERSION@' QUIET=0 # minimal of package before deltas are generated (bytes) min_pkg_size=$((1024*1024)) # percent of new package above which the delta will be discarded max_delta_size=70 # ensure we have a sane umask set umask 0022 m4_include(library/output_format.sh) # print usage instructions usage() { printf "pkgdelta (pacman) %s\n\n" "$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 (bytes)\n")" printf -- "$(gettext " --max-delta-size percent of package size above which deltas will be discarded\n")" } version() { printf "pkgdelta (pacman) %s\n\n" "$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")" } isnumeric() { [[ $1 != *[!0-9]* ]] } read_pkginfo() { pkgname= pkgver= arch= local OLDIFS=$IFS # IFS (field separator) is only the newline character IFS=" " local line var val for line in $(bsdtar -xOqf "$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="$arch" pkgsize="$(@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 } declare -a args # 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 ! isnumeric "$2"; then echo "invalid argument '$2' for option -- '$1'" exit 1 fi min_pkg_size=$2 shift ;; --max-delta-size) arg=$(echo "$2" | awk '{print $1 * 100}') if ! isnumeric "$arg" || (($arg > 200)); then echo "invalid argument '$2' for option -- '$1'" exit 1 fi max_delta_size=$arg shift ;; --) shift; args+=("$@"); break 2 ;; -*) echo "invalid option -- '$1'"; usage; exit 1 ;; *) args+=("$1");; esac shift done if (( ${#args[@]} != 2 )); then usage exit 1 fi for i in "${args[@]}"; 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 "${args[@]}" # vim: set ts=2 sw=2 noet: