Gentoo cloner: old utility to clone gentoo installation on twin machines

gentoo-cloner.sh

#!/bin/bash
# GentooCloner 0.5.1_alpha - clone your gentoo on identical/similar machines or just do a stage4 :)

AUTHOR="Copyright (c) 2006 Andrea Pavoni (http://andreapavoni.com)"

LICENSE="
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
   This product includes software developed by Andrea Pavoni.
4. The name Andrea Pavoni or teknux may not be used to endorse or promote
   products derived from this software without specific prior written
   permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
"

##### BEGIN USER CONFIGURATION ####################################

# which disk to be considered for partition table infos
DISK=/dev/sda

# name of the output file
OUT_NAME="stage4-`hostname`-`date +\%Y\%m\%d`"

# optional files/paths to be excluded (syntax examples: /dir1/:dir2/*:/path/file)
OPT_EXCLUDE_LIST="/data/*:/usr/src/*:/home/*/*:/usr/portage/*:/var/log/*/*:/root/*"

# this is your root-mount-point where to restore the system
# if you're using a gentoo live-cd keep this setting :)
RESTORE_LOCATION=/mnt/gentoo/
##### END USER CONFIGURATION #######################################

dump_stage4 ()
{
  LOCATION=$1

  #telinit 1

  echo "Creating $LOCATION directory"
  mkdir -p $LOCATION

  # copy this script in $LOCATION for future restoring
  cp $0 $LOCATION

  echo "Saving partition table "

  # backup patition table info
  dd if=$DISK of=$LOCATION/mbr.save count=1 bs=446
  /sbin/sfdisk -d $DISK > $LOCATION/hdtable.save

  # backup filesystem info, first one is the root ('/') dir
  grep $DISK /etc/fstab | awk '{ print $2"\t"$1"\t"$3 }' | sort >> $LOCATION/fs.save

  # exclude some default paths
  DEFAULT_EXCLUDE_LIST="/tmp/*:/var/tmp/*:/dev/*:/proc/*:/mnt/*:/sys/*:$LOCATION/*"

  EXCLUDE_LIST=`get_exclude_list`

  echo "Creating $OUT_NAME in $LOCATION"

  tar cjvpf $LOCATION/$OUT_NAME.tar.bz2 $EXCLUDE_LIST / 1>$LOCATION/$OUT_NAME.log 2>&1

  printf "\n\nDONE\n"

  exit 0
}

restore_stage4 ()
{
  LOCATION=$1

  echo "Restoring $DISK partition table"

  dd if=mbr.save of=$DISK
  sfdisk $DISK < $LOCATION/hdtable.save

  echo "Rebuilding filesystems"

  for i in $(grep reiserfs $LOCATION/fs.save | awk '{ print $2 }') ; do
    mkreiserfs -f -f $i
  done

  for i in $(grep ext3 $LOCATION/fs.save | awk '{ print $2 }') ; do
    mkfs.ext3 $i
  done

  SWAP=`grep swap $LOCATION/fs.save | awk '{ print $2 }'`
  mkswap $SWAP && swapon $SWAP

  # mount the root partition
  mount `get_root_partition $LOCATION` $RESTORE_LOCATION

  echo "Creating dir(s) and mounting them"

  for i in $(grep $DISK $LOCATION/fs.save | awk '{print $1}'| egrep '/.'| sed -e 's/\///g') ; do
    mkdir -p $RESTORE_LOCATION/$i
    echo "$i"
    mount `grep $i $LOCATION/fs.save | awk '{print $2}'` $RESTORE_LOCATION/$i
  done

  echo "Restoring stage4 from `ls $LOCATION/*.tar.bz2` to $RESTORE_LOCATION"
  tar xfjvp `ls $LOCATION/*.tar.bz2` -C $RESTORE_LOCATION

  cp -Rp /dev/* $RESTORE_LOCATION/dev/

  printf "\n\nDONE\n"

  exit 0
}

# discover where is the / (root) partition
get_root_partition ()
{
  LOCATION=$1
  LINE_N=`grep $DISK $LOCATION/fs.save | awk '{ print $1 }' | egrep -n ^/$ | cut -d':' -f1`
  FS_LINES=`wc -l $LOCATION/fs.save | awk '{ print $1 }'`
  echo `cat $LOCATION/fs.save | head -n$FS_LINES | tail -n1 | awk '{ print $2 }'`
}

# handle the (default/optional)-exclude-list of files and dirs
get_exclude_list ()
{
  EXCL_TMP=""
  FINAL=$DEFAULT_EXCLUDE_LIST:$OPT_EXCLUDE_LIST
  for i in $(echo $FINAL | awk '{ split($1,path,":") ;for(p in path){if(path[p]!=""){print " --exclude="path[p]}}}') ; do
          EXCL_TMP="$EXCL_TMP $i"
  done

  echo `for i in $EXCL_TMP ; do echo -n "$i " ; done`
}

usage ()
{
  echo "Usage:"
  printf "\t$0 dump WHERE_TO_SAVE_STAGE4_PATH\n\n"
  printf "\t$0 restore WHERE_TO_READ_STAGE4_PATH\n\n"
  exit -1
}


if [ $# != 2 ] ; then
  usage
fi

case "$1" in
  dump ) dump_stage4 "$2";;

  restore ) restore_stage4 "$2";;

  * ) usage;;
esac