diff options
Diffstat (limited to 'pcr/pactools/pt-pacman-cage')
| -rwxr-xr-x | pcr/pactools/pt-pacman-cage | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/pcr/pactools/pt-pacman-cage b/pcr/pactools/pt-pacman-cage new file mode 100755 index 000000000..f9248e496 --- /dev/null +++ b/pcr/pactools/pt-pacman-cage @@ -0,0 +1,152 @@ +#!/bin/bash +# +# pacman-cage +# +# Copyright (c) 2002-2006 by Andrew Rose <rose.andrew@gmail.com> +# I used Judds pacman-optimise as a framework. +# +# 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='2.9.8.1' +dbroot="/var/lib/pacman" +pacmandb="/var/lib/pacman.db" + +usage() { + echo "pacman-cage $myver" + echo "usage: $0 pacman_db_size(MB)" + echo + echo "pacman-cage creates a loopbacked filesystem in a contigious file." + echo "This will give better response times when using pacman" + echo "A safe value for pacman_db_size should be > 40" + echo + echo "If you are unsure, use this:" + echo " $0 60" + echo +} + +die() { + echo "pacman-cage: $*" >&2 + exit 1 +} + +die_r() { + rm -f /tmp/pacman.lck + die $* +} + +loop_check=`zcat /proc/config.gz | grep CONFIG_BLK_DEV_LOOP | cut -d\= -f2` + +if [ "$loop_check" == "m" ]; then + if [ `lsmod | grep loop | cut -d\ -f1` != "loop" ]; then + echo "Error. You have to load the module 'loop' in rc.conf." + exit 1 + fi +fi + +if [ "$loop_check" == "CONFIG_BLK_DEV_LOOP" ]; then + echo "Error. Your kernel config doesn't include CONFIG_BLK_DEV_LOOP." + exit 1 +fi + + +if [ "$#" != "1" ]; then echo "wrong number of parameters" 1>&2 ; usage; exit 0; fi + +if [ "$1" != "" ]; then + if [ "$1" = "-h" -o "$1" = "--help" ]; then + usage + exit 0 + fi + dbsize=$1 +fi + +if [ "`id -u`" != 0 ]; then + die "You must be root to cage 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 +# make sure pacman.db hasnt already been made +if [ -f $pacmandb ]; then + die "$pacmandb already exists!." +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 $dbroot -type f | sort | xargs md5sum >/tmp/pacsums.old + +echo "==> creating pacman.db loopback file..." +dd if=/dev/zero of=$pacmandb bs=1M count=$dbsize > /dev/null 2>&1 + +echo "==> creating ext2 -O dir_index -b 1024 -m 0 on $pacmandb..." +yes | mkfs.ext2 -O dir_index -b 1024 -i 1024 -m 0 -F $pacmandb > /dev/null 2>&1 + +echo "==> creating temporary mount point /mnt/tmp-pacman.." +mkdir /mnt/tmp-pacman + +echo "==> mounting pacman.db to temporary mount point..." +mount -o loop $pacmandb /mnt/tmp-pacman + +echo "==> copying pacman database to temporary mount point..." +cp -a /var/lib/pacman/. /mnt/tmp-pacman + +echo "==> unmounting temporary mount point..." +umount /mnt/tmp-pacman + +echo "==> removing temporary mount point..." +rmdir /mnt/tmp-pacman + +echo "==> moving old /var/lib/pacman to /var/lib/pacman.bak..." +mv /var/lib/pacman /var/lib/pacman.bak + +echo "==> createing new pacman db mount point @ $dbroot..." +mkdir $dbroot + +echo "==> Mounting new pacman db..." +mount -o loop $pacmandb $dbroot + +echo "==> md5sum'ing the new database..." +find $dbroot -type f | sort | xargs md5sum >/tmp/pacsums.new + +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 + umount $dbroot + rm $pacmandb + mv $dbroot.bak $dbroot + die_r "integrity check FAILED, reverting to old database" +fi + +echo "==> Updating /etc/fstab to reflect changes..." +echo "$pacmandb $dbroot ext2 loop,defaults 0 0" >> /etc/fstab + +rm -f /tmp/pacman.lck /tmp/pacsums.old /tmp/pacsums.new + +echo +echo "Finished. Your pacman database has been caged!. May the speedy pacman be with you." +echo + +exit 0 |