#!/bin/sh
# Switch from harddisk to RAM mode.
#
# Rene Mayrhofer, 2003

. /etc/cramdisk.conf

mntpoint=/cramfs

if [ -e /on-cramfs ]; then
  echo "Already running on CRAMFS."
  exit 1
fi

if grep -q "$mntpoint" /proc/mounts; then
  umount $mntpoint/mnt 2>/dev/null
  umount $mntpoint/var 2>/dev/null
  umount $mntpoint/data 2>/dev/null
  umount $mntpoint/dev 2>/dev/null
  umount $mntpoint/proc 2>/dev/null
  umount $mntpoint
fi

echo "Building CRAMFS image"
#/usr/local/sbin/createramfs.sh
echo "Mounting CRAMFS image"
# this is stupid - why do we have to do it twice before it works ??
dd if=/boot/cramfs.img of=/dev/rd/0 2>/dev/null
mount -t cramfs /dev/rd/0 $mntpoint
dd if=/boot/cramfs.img of=/dev/rd/0 2>/dev/null
mount -t cramfs /dev/rd/0 $mntpoint
cd $mntpoint

echo "Mounting needed kernel filesystems"
mount -nt proc none proc/
mount -nt devfs none dev/

echo "Changing root to CRAMFS"
/sbin/pivot_root . mnt <dev/console >dev/console 2>&1

echo "Creating RAM disk for var/"
mount -nt tmpfs -o size=300M none var/
echo "Creating directories for var"
for d in $CREATE_VAR_DIRS; do
  mkdir -p var/$d
done
echo "Copying directories to var/"
for d in $COPY_VAR_DIRS; do
  mkdir -p var/$d
  cp -dp mnt/var/$d/* var/$d/ 2> /dev/null
done
echo "Linking directories for var"
for d in $LINK_VAR_DIRS; do
  ln -s /var-static/$d var/`dirname $d`
done

echo "Re-executing init"
/usr/sbin/chroot . /sbin/telinit u <dev/console >/dev/console 2>&1

echo "Killing all processes that still have stuff open on /mnt"
/usr/bin/killall getty
/usr/sbin/lsof -n | grep "/mnt" |
  while read name pid user fd type device size node name; do
    # don't kill ourselves or the currently running rc script ....
    if [ -d /proc/$pid ] && 
    	! cat /proc/$pid/cmdline | grep -q "switch-to-cramfs" &&
    	! cat /proc/$pid/cmdline | grep -q "/etc/init.d/rc"; then
      /bin/kill -9 $pid
    fi
  done
  
echo "Mounting data directory read-only"
if grep -q "/mnt/data" /proc/mounts; then 
  umount -n /mnt/data
fi 
mount -nt ext2 -o ro /dev/discs/disc0/part3 /data

echo -n "Postponing unmount of filesystems until runlevel switch has completed"
/usr/sbin/chroot . /bin/bash -c ' 
  # the grep -v is because the processlist contains this command itself...
  while ps ax | grep -v "\"/etc/init.d/rc\"" | grep -q "/etc/init.d/rc"; do 
    sleep 1s 
  done 
  echo "Unmounting old filesystems" 
  if grep -q "/mnt/dev" /proc/mounts; then 
    umount -n /mnt/dev
  fi 
  if grep -q "/mnt/proc/bus/usb" /proc/mounts; then
    umount -n /mnt/proc/bus/usb
  fi 
  if grep -q "/mnt/proc" /proc/mounts; then 
    umount -n /mnt/proc
  fi 
  if grep -q "/mnt/mnt/cdrom" /proc/mounts; then 
    umount -n /mnt/mnt/cdrom
  fi 
  if grep -q "/mnt/mnt/usb" /proc/mounts; then 
    umount -n /mnt/mnt/usb
  fi 
  if grep -q "/mnt/data" /proc/mounts; then 
    umount -n /mnt/data
  fi 

  if umount /mnt; then 
    /sbin/hdparm -y /dev/hda 
  fi' < /dev/null > /dev/null 2> /dev/null &
echo "."

exit 0