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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='2.9.9'
dbroot="/var/lib/pacman"
pacmandb="/var/lib/pacman.db"
pacmanlog=$(pacman -Qv | grep "Log File" | cut -d ":" -f2)
usage() {
echo "pacman-cage $myver"
echo "usage: $0 [pacman_db_root]"
echo
echo "pacman-cage creates a loopbacked filesystem in a contigious file."
echo "This will give better response times when using pacman"
echo
}
die() {
echo "pacman-cage: $*" >&2
exit 1
}
die_r() {
rm -f /tmp/pacman.lck
die $*
}
if [[ "$1" != "" ]]; then
if [[ "$1" == "-h" || "$1" == "--help" ]]; then
usage
exit 0
fi
dbroot=$1
fi
[[ $(id -u) != 0 ]] && die "You must be root to cage the database"
# added by wain: make sure kernel support loop device
if ! zcat /proc/config.gz | grep "BLK_DEV_LOOP=\(y\|m\)" >/dev/null; then
die "please enable loop device support in kernel (BLK_DEV_LOOP=y)"
fi
# make sure pacman isn't running
[[ -f /tmp/pacman.lck ]] && die "Pacman lockfile was found. Cannot run while pacman is running."
# make sure pacman.db hasnt already been made
[[ -f $pacmandb ]] && die "$pacmandb already exists!"
[[ ! -d $dbroot ]] && die "$dbroot does not exist or is not a directory."
# don't let pacman run while we do this
touch /tmp/pacman.lck
# write to pacman.log
echo "[ $(date '+%Y-%m-%d %H:%M ')] Pacman-cage [cmd] >> Starting and preparing pacman database caging process ..." >> $pacmanlog
# 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=150 &>/dev/null
echo "==> creating ext2 -O dir_index -b 1024 on $pacmandb..."
mkfs.ext2 -F -O dir_index -b 1024 -m 0 $pacmandb &>/dev/null
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..."
[[ -d /var/lib/pacman.bak ]] && rm -rf /var/lib/pacman.bak
mv /var/lib/pacman /var/lib/pacman.bak
echo "==> creating 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
if [[ $? != 0 ]]; then
# failed, move the old one back into place
umount $dbroot
rm $pacmandb
mv $dbroot.bak $dbroot
echo "[ $(date '+%Y-%m-%d %H:%M ')] Pacman-cage [cmd] >> Something went wrong. Old database was restored." >> $pacmanlog
die_r "integrity check FAILED, reverting to old database"
fi
# Replaced by wain: mount is now in /etc/rc.d/pacmandb daemon
#echo "==> Updating /etc/fstab to reflect changes..."
#echo "$pacmandb $dbroot ext2 loop,defaults 0 0" >> /etc/fstab
rm -f /tmp/pacman.lck /tmp/pacsums.old /tmp/pacsums.new
echo "[ $(date '+%Y-%m-%d %H:%M ')] Pacman-cage [cmd] >> Pacman database has been caged." >> $pacmanlog
echo
echo "Finished. Your pacman database has been caged!. May the speedy pacman be with you."
echo
exit 0
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