mirror of
https://github.com/moparisthebest/pacman
synced 2024-11-10 03:25:01 -05:00
117 lines
3.2 KiB
Bash
Executable File
117 lines
3.2 KiB
Bash
Executable File
#!/bin/bash
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#
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# pacman-optimize
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#
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# Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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# USA.
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#
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myver='3.0.0'
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usage() {
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echo "pacman-optimize $myver"
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echo "usage: $0 [pacman_db_root]"
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echo
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echo "pacman-optimize is a little hack that should improve the performance"
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echo "of pacman when reading/writing to its filesystem-based database."
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echo
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echo "Because pacman uses many small files to keep track of packages,"
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echo "there is a tendency for these files to become fragmented over time."
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echo "This script attempts to relocate these small files into one"
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echo "contiguous location on your hard drive. The result is that the hard"
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echo "drive should be able to read them faster, since the hard drive head"
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echo "does not have to move around the disk as much."
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echo
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}
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die() {
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echo "pacman-optimize: $*" >&2
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exit 1
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}
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die_r() {
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rm -f /tmp/pacman.lck
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die $*
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}
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dbroot="/var/lib/pacman"
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if [ "$1" != "" ]; then
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if [ "$1" = "-h" -o "$1" = "--help" ]; then
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usage
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exit 0
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fi
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dbroot=$1
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fi
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# make sure pacman isn't running
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if [ -f /tmp/pacman.lck ]; then
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die "Pacman lockfile was found. Cannot run while pacman is running."
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fi
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if [ ! -d $dbroot ]; then
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die "$dbroot does not exist or is not a directory"
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fi
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#if [ "$EUID" != 0 ]; then
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if [ ! -w "$dbroot" ]; then
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die "You must have correct permissions to optimize the database"
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fi
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# don't let pacman run while we do this
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touch /tmp/pacman.lck
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# step 1: sum the old db
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echo "==> md5sum'ing the old database..."
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find $dbroot -type f | sort | xargs md5sum >/tmp/pacsums.old
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# step 1: copy the entire db directory to a new one
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echo "==> copying $dbroot..."
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cp -a $dbroot $dbroot.new || die_r "error copying $dbroot"
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# step 2: switch the directory names and sum the new one
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echo "==> md5sum'ing the new database..."
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mv $dbroot $dbroot.bak || die_r "error renaming $dbroot"
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mv $dbroot.new $dbroot || die_r "error renaming $dbroot.new"
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find $dbroot -type f | sort | xargs md5sum >/tmp/pacsums.new
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# step 3: compare sums
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echo "==> checking integrity..."
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diff /tmp/pacsums.old /tmp/pacsums.new >/dev/null 2>&1
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if [ $? -ne 0 ]; then
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# failed, move the old one back into place
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rm -rf $dbroot
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mv $dbroot.bak $dbroot
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die_r "integrity check FAILED, reverting to old database"
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fi
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# step 4: remove the backup
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echo "==> removing old database..."
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rm -rf $dbroot.bak || die_r "error removing backup $dbroot.bak"
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# remove the lock and sum files
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rm -f /tmp/pacman.lck /tmp/pacsums.old /tmp/pacsums.new
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echo
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echo "Finished. Your pacman database has been optimized."
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echo
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exit 0
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# vim: set ts=2 sw=2 noet:
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