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|
#!/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
|
