Changes to image_to_live to copy stateful partition over

src/platform/init/chromeos_startup

 #!/bin/sh
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 HAS_INITRAMFS=0
 if [ -d /dev/.initramfs ]
 then
   # The initrd will have mounted /sys, /proc, and /dev for us.
@@ skipping 33 matching lines @@
 # Check if the stateful partition has requested self-destruction
 # This is used for the factory install process
 RESET_FILE="/mnt/stateful_partition/factory_install_reset"
 if [ -f "$RESET_FILE" ]; then
   if [ $(stat -c%u "$RESET_FILE") -eq 0 ]; then
     echo "Erasing stateful partition..."
     exec /sbin/clobber-state
   fi
 fi
 
+# Check if we have an update to stateful pending.  This is used for dev_mode.
+VAR_NEW="/mnt/stateful_partition/var_new"
+DEVELOPER_NEW="/mnt/stateful_partition/dev_image_new"
+STATEFUL_UPDATE="/mnt/stateful_partition/.update_available"
+if [ -f "$STATEFUL_UPDATE" ] ; then
+  sudo rm -rf /mnt/stateful_partition/dev_image
+  sudo rm -rf /mnt/stateful_partition/var
+  sudo mv "$DEVELOPER_NEW" /mnt/stateful_partition/dev_image
+  sudo mv "$VAR_NEW" /mnt/stateful_partition/var
+  sudo rm  $STATEFUL_UPDATE
+fi  
+
 # Make sure stateful partition has some basic directories
 mkdir -p -m 0755 /mnt/stateful_partition/home
 mkdir -p -m 0755 /mnt/stateful_partition/etc
 mkdir -p -m 0755 /mnt/stateful_partition/var/cache
 mkdir -p -m 0755 /mnt/stateful_partition/var/empty
 mkdir -p -m 0755 /mnt/stateful_partition/var/lib
 mkdir -p -m 0755 /mnt/stateful_partition/var/lock
 mkdir -p -m 0755 /mnt/stateful_partition/var/log
 mkdir -p -m 0755 /mnt/stateful_partition/var/tmp
 mkdir -p -m 0755 /mnt/stateful_partition/var/run
@@ skipping 33 matching lines @@
 (test -f "$SALT" || head -c 16 /dev/urandom > "$SALT") &
 
 # Write out uptime and disk stats pre/post startup
 cat /proc/uptime > /tmp/uptime-post-startup
 ! cat /sys/block/sda/stat > /tmp/disk-post-startup
 echo "$PRE_UPTIME_STAT" > /tmp/uptime-pre-startup
 echo "$PRE_DISK_STAT" > /tmp/disk-pre-startup
 
 # Always return success to avoid killing init
 exit 0