fix for issue 2610

src/platform/installer/chromeos-install

 #!/bin/sh -u
 # 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.
 #
 # A script to install from removable media to hard disk.
 
 # Load functions and constants for chromeos-install.
 . "$(dirname "$0")/chromeos-common.sh" || exit 1
 . /usr/lib/shflags || exit 1
 
 if [ $(uname -m) = "armv7l" ]; then
   DEFAULT_DST=/dev/mmcblk0
 else
   DEFAULT_DST=/dev/sda
 fi
 
 DEFINE_string dst "${DEFAULT_DST}" "Destination device"
 DEFINE_boolean skip_src_removable ${FLAGS_FALSE} \
   "Skip check to ensure source is removable"
 DEFINE_boolean skip_rootfs ${FLAGS_FALSE} \
   "Skip installing the rootfs; Only set up partition table"
 DEFINE_boolean run_as_root ${FLAGS_FALSE} \
   "Allow root to run this script (Careful, it won't prompt for a password!)"
 DEFINE_boolean yes ${FLAGS_FALSE} \
   "Answer yes to everything"
+DEFINE_boolean recovery ${FLAGS_FALSE} \
+  "Install from a recovery image. Default: False"
 
 # Parse command line
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
 set -e
 
 # Don't run this as root
 dont_run_as_root
 
@@ skipping 164 matching lines @@
 
 ##############################################################################
 
 # What do we expect & require to have on the source device?
 STATEFUL_IMG=$(make_partition_dev ${SRC} 1)
 KERNEL_IMG=$(make_partition_dev ${SRC} 2)
 ROOTFS_IMG=$(make_partition_dev ${SRC} 3)
 OEM_IMG=$(make_partition_dev ${SRC} 8)
 ESP_IMG=$(make_partition_dev ${SRC} 12)
 
+# For recovery image, copy from ROOT-B and KERN-B to destination
+if [ "$FLAGS_recovery" -eq "$FLAGS_TRUE" ]; then
+  KERNEL_IMG=$(make_partition_dev ${SRC} 4)
+  ROOTFS_IMG=$(make_partition_dev ${SRC} 5)
+fi
+
 if [ $(uname -m) = "armv7l" ]; then
   PMBRCODE=/dev/zero
 else
   # Steal the PMBR code from the source MBR to put on the dest MBR, for booting
   # on legacy-BIOS devices.
   sudo dd if=$SRC of=$PMBRCODE bs=512 count=1
 fi
 
 # Create the GPT.
 install_gpt $FLAGS_dst $ROOTFS_IMG $KERNEL_IMG $STATEFUL_IMG $PMBRCODE $ESP_IMG
@@ skipping 86 matching lines @@
     --set bootcmd="mmc read 0 C0008000 0 1; autoscr C0008000"
 fi
 
 # Force data to disk before we declare done.
 sync
 
 echo "------------------------------------------------------------"
 echo ""
 echo "Installation to '$FLAGS_dst' complete."
 echo "Please shutdown, remove the USB device, cross your fingers, and reboot."