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#!/bin/bash
#
# pacman-uncage
#
# 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'
dbroot="/var/lib/pacman"
tmproot="/var/lib/pacman.new"
pacmandb="/var/lib/pacman.db"
usage() {
echo "pacman-uncage $myver"
echo "usage: $0 [pacman_db_root]"
echo
echo "pacman-uncage returns your pacman db to the generic style."
echo
}
die() {
echo "pacman-uncage: $*" >&2
exit 1
}
die_r() {
rm -f /tmp/pacman.lck
die $*
}
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 uncage 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
echo "==> copying pacman.db contents back, note: the time needed to get a brew is now."
mkdir $tmproot
cp -a $dbroot/. $tmproot
echo "==> unmounting old dbroot and moving new one in"
umount $dbroot
rmdir $dbroot
mv $tmproot $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
rm -rf $dbroot
mkdir $dbroot
mount -a
die_r "integrity check FAILED, reverting to old database"
fi
echo "==> Removing old pacman.db"
rm $pacmandb
rm -f /tmp/pacman.lck /tmp/pacsums.old /tmp/pacsums.new
echo
echo "Finished. Your pacman database has been uncaged!. Welcome home."
echo "You will need to remove the old mount line from your /etc/fstab"
echo
exit 0
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