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+#!/bin/bash
+#
+# pacman-optimize
+#
+# Copyright (c) 2002-2005 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.
+#
+
+myver='2.9.7'
+
+usage() {
+ echo "pacman-optimize $myver"
+ echo "usage: $0 [pacman_db_root]"
+ echo
+ echo "pacman-optimize is a little hack that should improve the performance"
+ echo "of pacman when reading/writing to its filesystem-based database."
+ echo
+ echo "Because pacman uses many small files to keep track of packages,"
+ echo "there is a tendency for these files to become fragmented over time."
+ echo "This script attempts to relocate these small files into one"
+ echo "contiguous location on your hard drive. The result is that the hard"
+ echo "drive should be able to read them faster, since the hard drive head"
+ echo "does not have to move around the disk as much."
+ echo
+}
+
+die() {
+ echo "pacman-optimize: $*" >&2
+ exit 1
+}
+
+die_r() {
+ rm -f /tmp/pacman.lck
+ die $*
+}
+
+
+dbroot="/var/lib/pacman"
+
+if [ "$1" != "" ]; then
+ if [ "$1" = "-h" -o "$1" = "--help" ]; then
+ usage
+ exit 0
+ fi
+ dbroot=$1
+fi
+
+if [ "`id -u`" != 0 ]; then
+ die "You must be root to optimize the database"
+fi
+
+# make sure pacman isn't running
+if [ -f /tmp/pacman.lck ]; then
+ die "Pacman lockfile was found. Cannot run while pacman is running."
+fi
+
+if [ ! -d $dbroot ]; then
+ die "$dbroot does not exist or is not a directory"
+fi
+
+# don't let pacman run while we do this
+touch /tmp/pacman.lck
+
+# step 1: sum the old db
+echo "==> md5sum'ing the old database..."
+find $dbroot -type f | sort | xargs md5sum >/tmp/pacsums.old
+
+# step 1: copy the entire db directory to a new one
+echo "==> copying $dbroot..."
+cp -a $dbroot $dbroot.new || die_r "error copying $dbroot"
+
+# step 2: switch the directory names and sum the new one
+echo "==> md5sum'ing the new database..."
+mv $dbroot $dbroot.bak || die_r "error renaming $dbroot"
+mv $dbroot.new $dbroot || die_r "error renaming $dbroot.new"
+find $dbroot -type f | sort | xargs md5sum >/tmp/pacsums.new
+
+# step 3: compare sums
+echo "==> checking integrity..."
+diff /tmp/pacsums.old /tmp/pacsums.new >/dev/null 2>&1
+if [ $? -ne 0 ]; then
+ # failed, move the old one back into place
+ rm -rf $dbroot
+ mv $dbroot.bak $dbroot
+ die_r "integrity check FAILED, reverting to old database"
+fi
+
+# step 4: remove the backup
+echo "==> removing old database..."
+rm -rf $dbroot.bak || die_r "error removing backup $dbroot.bak"
+
+# remove the lock and sum files
+rm -f /tmp/pacman.lck /tmp/pacsums.old /tmp/pacsums.new
+
+echo
+echo "Finished. Your pacman database has been optimized."
+echo
+
+exit 0
+