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#!/bin/bash
#
# pacman-optimize
# @configure_input@
#
# Copyright (c) 2002-2007 by Judd Vinet <jvinet@zeroflux.org>
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
# USA.
#
# gettext initialization
export TEXTDOMAIN='pacman'
export TEXTDOMAINDIR='@localedir@'
myver='@PACKAGE_VERSION@'
dbroot='@localstatedir@/lib/pacman/'
lockfile="${dbroot}db.lck"
msg() {
local mesg=$1; shift
printf "==> ${mesg}\n" "$@" >&2
}
error () {
local mesg=$1; shift
printf "==> ERROR: ${mesg}\n" "$@" >&2
}
usage() {
printf "pacman-optimize (pacman) %s\n" "$myver"
echo
printf "$(gettext "Usage: %s[pacman_db_root]")\n" "$0"
echo
echo "$(gettext "pacman-optimize is a little hack that should improve the performance")"
echo "$(gettext "of pacman when reading/writing to its filesystem-based database.")"
echo
echo "$(gettext "Because pacman uses many small files to keep track of packages,")"
echo "$(gettext "there is a tendency for these files to become fragmented over time.")"
echo "$(gettext "This script attempts to relocate these small files into one")"
echo "$(gettext "continuous location on your hard drive. The result is that the hard")"
echo "$(gettext "drive should be able to read them faster, since the hard drive head")"
echo "$(gettext "does not have to move around the disk as much.")"
echo
}
version() {
printf "pacman-optimize (pacman) %s\n" "$myver"
printf "Copyright (C) 2002-2007 Judd Vinet <jvinet@zeroflux.org>.\n"
echo
printf "This is free software; see the source for copying conditions.\n"
printf "There is NO WARRANTY, to the extent permitted by law.\n"
echo
}
die() {
error $@
exit 1
}
die_r() {
rm -f $lockfile
die $@
}
if [ "$1" = "-h" -o "$1" = "--help" ]; then
usage
exit 0
fi
if [ "$1" = "-V" -o "$1" = "--version" ]; then
version
exit 0
fi
if [ "$1" != "" ]; then
dbroot="$1"
fi
# make sure pacman isn't running
if [ -f $lockfile ]; then
die "$(gettext "Pacman lockfile was found. Cannot run while pacman is running.")"
fi
if [ ! -d "$dbroot" ]; then
die "$(gettext "%s does not exist or is not a directory.")" "$dbroot"
fi
if [ ! -w "$dbroot" ]; then
die "$(gettext "You must have correct permissions to optimize the database.")"
fi
# do not let pacman run while we do this
touch $lockfile
# step 1: sum the old db
msg "$(gettext "MD5sum'ing the old database...")"
find $dbroot -type f | sort | xargs md5sum > /tmp/pacsums.old
# step 2: tar it up
msg "$(gettext "Tar'ing up %s...")" "$dbroot"
cd $dbroot
tar -czf /tmp/pacmanDB.tgz ./
if [ $? -ne 0 ]; then
rm -f /tmp/pacmanDB.tgz /tmp/pacsums.old
die_r "$(gettext "Tar'ing up %s failed.")" "$dbroot"
fi
# step 3: make and sum the new db
msg "$(gettext "Making and MD5sum'ing the new db...")"
mkdir $dbroot.new
tar -zxpf /tmp/pacmanDB.tgz -C $dbroot.new/
if [ $? -ne 0 ]; then
rm -f /tmp/pacmanDB.tgz /tmp/pacsums.old
rm -rf "$dbroot.new"
die_r "$(gettext "Untar'ing $dbroot failed.")"
fi
find "$dbroot.new" -type f | sort | sed -e 's/pacman.new/pacman/g' | \
xargs md5sum > /tmp/pacsums.new
# step 4: compare the sums
msg "$(gettext "Checking integrity...")"
diff /tmp/pacsums.old /tmp/pacsums.new >/dev/null 2>&1
if [ $? -ne 0 ]; then
# failed
# leave /tmp/pacsums.old and .new for checking to see what doesn't match up
rm -rf "$dbroot.new" $lockfile /tmp/pacmanDB.tgz
die_r "$(gettext "integrity check FAILED, reverting to old database.")"
fi
# step 5: remove the new temporary database and the old one
# and use the .tgz to replace the old one
msg "$(gettext "Putting the new database in place...")"
rm -rf "$dbroot.new" "$dbroot"/*
tar -zxpf /tmp/pacmanDB.tgz -C "$dbroot"/
# remove the lock file, sum files, and .tgz of database
rm -f $lockfile /tmp/pacsums.old /tmp/pacsums.new /tmp/pacmanDB.tgz
echo
echo "$(gettext "Finished. Your pacman database has been optimized.")"
echo
exit 0
# vim: set ts=2 sw=2 noet:
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