daemon.sh

#!/bin/bash

. /etc/rc.conf
. /etc/rc.d/functions

dirs=(/dev /dev/pts /dev/shm /tmp)
case $1 in
    start)
        stat_busy "Starting Ubuntu chroot"
        mount -o loop -t ext4 /path/to/chrootbuntu.sda1.ext4.img /srv/chroot/lucid
        for d in "${dirs[@]}"; do
            mount -o bind $d /srv/chroot/lucid$d
        done
        mount -t proc none /srv/chroot/lucid/proc
        mount -t sysfs none /srv/chroot/lucid/sys
        add_daemon chrootbuntu
        stat_done
        ;;
    stop)
        stat_busy "Stopping Ubuntu chroot"
        for (( i = ${#dirs[@]} - 1; i >= 0; i-- )); do
            umount "/srv/chroot/lucid${dirs[i]}"
        done
        umount /srv/chroot/lucid/{proc,sys}
        umount /srv/chroot/lucid
        rm_daemon chrootbuntu
        stat_done
        ;;
    restart)
        $0 stop
        sleep 1
        $0 start
        ;;
    *)
        echo "usage: $0 {start|stop|restart}"
esac
exit 0