#!/bin/sh

# ****  DO NOT EVEN THINK OF EDITING OR REMOVING THIS FILE  ****
# **** UNLESS YOU REALLY KNOW *EXACTLY* WHAT YOU ARE DOING. ****


# Perform prepatory tasks, and determine whether an alternate rootfs is viable.

/bin/mount -t proc proc /proc

echo "1" > /proc/sys/kernel/panic

/bin/echo "Sleeping while waiting for disk..."
cnt=20
while [ $cnt -gt 0 ] ; do
  echo -ne "\r$cnt "
  sleep 1
  [ -f /proc/hdd_sdb ] && cnt=0
  [ -f /proc/hdd_sda ] && cnt=0
  cnt=`expr $cnt - 1`
done
echo

sleep 5

mounted=

for prefroot in sdb1 sda1 ; do
  if [ -z "$mounted" ] ; then
    if /bin/mount -rt ext3 /dev/$prefroot /mnt ; then
      if [ -x /mnt/bin/init ] ; then
        /bin/echo "Root filesystem will be mounted from /dev/$prefroot ..."
        mounted=/mnt
      else
        /bin/umount /mnt
        /bin/echo "Can't find valid rootfs on /dev/$prefroot ..."
      fi
    fi
  fi
done

if [ -z "$mounted" ] ; then
  /bin/echo "Can't find valid rootfs, using ramdisk ..."
  mounted=
fi

/bin/umount /proc

# Pivot to the desired rootfs and run the initial executable.

if [ -n "$mounted" ] ; then

    cd $mounted

    /bin/echo "Pivoting to external rootfs ..."
    /sbin/pivot_root . initrd

    exec /usr/sbin/chroot . /bin/init < /dev/console 1> /dev/console 2> /dev/console

else

    exec /bin/init

fi

/bin/echo "Can't pivot to external rootfs, using ramdisk ..."
exec /bin/init

# Last-resort fall-back - this should never be reached.
/bin/sh