skripty/pacman_cage.sh

   1 #!/bin/bash
   2 #
   3 #   pacman-cage
   4 #
   5 #   Copyright (c) 2002-2006 by Andrew Rose <rose.andrew@gmail.com>
   6 #   I used Judds pacman-optimise as a framework.
   7 #
   8 #   This program is free software; you can redistribute it and/or modify
   9 #   it under the terms of the GNU General Public License as published by
  10 #   the Free Software Foundation; either version 2 of the License, or
  11 #   (at your option) any later version.
  12 #
  13 #   This program is distributed in the hope that it will be useful,
  14 #   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 #   GNU General Public License for more details.
  17 #
  18 #   You should have received a copy of the GNU General Public License
  19 #   along with this program; if not, write to the Free Software
  20 #   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  21 #   USA.
  22 #
  23
  24 myver='2.9.8'
  25 dbroot="/var/lib/pacman"
  26 pacmandb="/var/lib/pacman.db"
  27
  28 usage() {
  29         echo "pacman-cage $myver"
  30         echo "usage: $0 [pacman_db_root]"
  31         echo
  32         echo "pacman-cage creates a loopbacked filesystem in a contigious file."
  33         echo "This will give better response times when using pacman"
  34         echo
  35 }
  36
  37 die() {
  38         echo "pacman-cage: $*" >&2
  39         exit 1
  40 }
  41
  42 die_r() {
  43         rm -f /tmp/pacman.lck
  44         die $*
  45 }
  46
  47 if [ "$1" != "" ]; then
  48         if [ "$1" = "-h" -o "$1" = "--help" ]; then
  49                 usage
  50                 exit 0
  51         fi
  52         dbroot=$1
  53 fi
  54
  55 if [ "`id -u`" != 0 ]; then
  56         die "You must be root to cage the database"
  57 fi
  58
  59 # make sure pacman isn't running
  60 if [ -f /tmp/pacman.lck ]; then
  61         die "Pacman lockfile was found.  Cannot run while pacman is running."
  62 fi
  63 # make sure pacman.db hasnt already been made
  64 if [ -f $pacmandb ]; then
  65         die "$pacmandb already exists!."
  66 fi
  67
  68 if [ ! -d $dbroot ]; then
  69         die "$dbroot does not exist or is not a directory"
  70 fi
  71
  72 # don't let pacman run while we do this
  73 touch /tmp/pacman.lck
  74
  75 # step 1: sum the old db
  76 echo "==> md5sum'ing the old database..."
  77 find $dbroot -type f | sort | xargs md5sum >/tmp/pacsums.old
  78
  79 echo "==> creating pacman.db loopback file..."
  80 dd if=/dev/zero of=$pacmandb bs=1M count=150 > /dev/null 2>&1
  81
  82 echo "==> creating ext2 -O dir_index -b 1024 -m 0 on $pacmandb..."
  83 yes | mkfs.ext2 -O dir_index -b 1024 -m 0 $pacmandb > /dev/null 2>&1
  84
  85 echo "==> creating temporary mount point /mnt/tmp-pacman.."
  86 mkdir /mnt/tmp-pacman
  87
  88 echo "==> mounting pacman.db to temporary mount point..."
  89 mount -o loop $pacmandb /mnt/tmp-pacman
  90
  91 echo "==> copying pacman database to temporary mount point..."
  92 cp -a /var/lib/pacman/. /mnt/tmp-pacman
  93
  94 echo "==> unmounting temporary mount point..."
  95 umount /mnt/tmp-pacman
  96
  97 echo "==> removing temporary mount point..."
  98 rmdir /mnt/tmp-pacman
  99
 100 echo "==> moving old /var/lib/pacman to /var/lib/pacman.bak..."
 101 mv /var/lib/pacman /var/lib/pacman.bak
 102
 103 echo "==> createing new pacman db mount point @ $dbroot..."
 104 mkdir $dbroot
 105
 106 echo "==> Mounting new pacman db..."
 107 mount -o loop $pacmandb $dbroot
 108
 109 echo "==> md5sum'ing the new database..."
 110 find $dbroot -type f | sort | xargs md5sum >/tmp/pacsums.new
 111
 112 echo "==> checking integrity..."
 113 diff /tmp/pacsums.old /tmp/pacsums.new >/dev/null 2>&1
 114 if [ $? -ne 0 ]; then
 115         # failed, move the old one back into place
 116         umount $dbroot
 117         rm $pacmandb
 118         mv $dbroot.bak $dbroot
 119         die_r "integrity check FAILED, reverting to old database"
 120 fi
 121
 122 echo "==> Updating /etc/fstab to reflect changes..."
 123 echo "$pacmandb $dbroot ext2 loop,defaults 0 0" >> /etc/fstab
 124
 125 rm -f /tmp/pacman.lck /tmp/pacsums.old /tmp/pacsums.new
 126
 127 echo
 128 echo "Finished.  Your pacman database has been caged!.  May the speedy pacman be with you."
 129 echo
 130
 131 exit 0