remove handling of kernel verification block from recovery image

mod_image_for_recovery.sh

 #!/bin/bash
 
 # 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.
 
 # Script to modify a pristine/dev Chrome OS image to be used for recovery
 
 . "$(dirname "$0")/common.sh"
 
@@ skipping 28 matching lines @@
 STATEFUL_FS_DIR="${OUTPUT_DIR}/stateful_partition"
 RECOVERY_IMAGE="recovery_image.bin"
 
 mount_gpt_cleanup() {
   "${SCRIPTS_DIR}/mount_gpt_image.sh" -u -r "$1" -s "$2"
 }
 
 # Modifies an existing image for recovery use
 update_recovery_packages() {
   local image_name=$1
-  local sector_size=512  # sector size in bytes
-  local num_sectors_vb=128  # number of sectors in kernel verification blob
-  # Start offset of kernel A (aligned to 4096-sector boundary)
-  local start_kern_a=4096
-  local vb_file="${STATEFUL_FS_DIR}/verification_blob.kernel"
 
   echo "Modifying image ${image_name} for recovery use"
 
   trap "mount_gpt_cleanup \"${ROOT_FS_DIR}\" \"${STATEFUL_FS_DIR}\"" EXIT
 
   ${SCRIPTS_DIR}/mount_gpt_image.sh --from "${OUTPUT_DIR}" \
     --image "$( basename ${image_name} )" -r "${ROOT_FS_DIR}" \
     -s "${STATEFUL_FS_DIR}"
 
   # Mark the image as a recovery image (needed for recovery boot)
   sudo touch "${STATEFUL_FS_DIR}/.recovery"
 
-  # Copy verification blob out of kernel A into stateful partition
-  # so that we can restore it during recovery
-  sudo touch $vb_file
-  echo "Backing up kernel verification blob onto stateful partition ..."
-  sudo dd if="$image_name" of="$vb_file" skip=$start_kern_a bs=$sector_size \
-      count=$num_sectors_vb conv=notrunc
-
-  # Overwrite verification blob with recovery image verification blob
-  # TODO(tgao): resign kernel for recovery image
-  echo "Overwrite kernel verification blob with resigned blob for recovery..."
-  sudo dd if=/dev/zero of="$image_name" seek=$start_kern_a bs=$sector_size \
-      count=$num_sectors_vb conv=notrunc
-
   trap - EXIT
   ${SCRIPTS_DIR}/mount_gpt_image.sh -u -r "${ROOT_FS_DIR}" \
       -s "${STATEFUL_FS_DIR}"
 }
 
 # Main
 
 DST_PATH="${OUTPUT_DIR}/${RECOVERY_IMAGE}"
 echo "Making a copy of original image ${SRC_PATH}"
 cp $SRC_PATH $DST_PATH
 update_recovery_packages $DST_PATH
 echo "Recovery image created at ${DST_PATH}"