Tue Feb 18 01:56:27 UTC 2014

1 files changed, 152 insertions, 0 deletions

diff --git a/pcr/pactools/pt-pacman-cage b/pcr/pactools/pt-pacman-cage
new file mode 100644
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