#!/bin/bash
#
#######################################################
# This is a simple script to create a chroot
# You'll have to run
#
#	chroot /path/to/chroot </bin/bash>
#
# after this script exits.
# written by Norbert Varzariu <loomsen@googlemail.com>
#######################################################
# has to be run as root, so lets check
[[ $UID == 0 ]] && : || (echo "you have to be root";exit 1)

_MNTPART=
_CHROOTDIR=

set -x

function mount-defaults
{
mount "$_MNTPART" "$_CHROOTDIR"
mount -t proc none $_CHROOTDIR/proc
mount -t sysfs none $_CHROOTDIR/sys
mount --bind /dev $_CHROOTDIR/dev
mount --bind /dev/pts $_CHROOTDIR/dev/pts
mount --bind /dev/shm $_CHROOTDIR/dev/shm
}

function unchroot
{
umount $_CHROOTDIR/dev/shm
umount $_CHROOTDIR/dev/pts
umount $_CHROOTDIR/dev
umount $_CHROOTDIR/sys
umount $_CHROOTDIR/proc
umount $_CHROOTDIR
}

if [ "$1" == "" ]; then
	echo "usage: \"$0\" /path/to/partition <path-to-chroot>"
	exit $?
else
    	case "$1" in
		/dev/[sh]d* )
       		        _MNTPART="$1"
             		if [ "$2" == "" ]; then _CHROOTDIR="/chroot"; else _CHROOTDIR="$2";fi
			export _CHROOTDIR _MNTPART
				        ;;
		"clean"|"-c"|"--clean" )
			[[ "$2" != "" ]] && _CHROOTDIR="$2" || _CHROOTDIR="/chroot"
			unchroot
			exit $?
                                        ;;
       	esac
	mount-defaults
	unset _CHROOTDIR _MNTPART
fi

exit $?