crosutils: move image_common.sh to lib/cros_image_common.sh

mk_memento_images.sh

 #!/bin/bash
 
 # Copyright (c) 2009 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.
 
 # This script takes a path to a rootfs.ext2 which was generated by
 # build_image.sh and generates an image that can be used for auto
 # update.
 
 set -e
 
-LIB_IMAGE_COMMON="$(dirname "$0")/image_common.sh"
-if ! . "$LIB_IMAGE_COMMON"; then
-  echo "Missing required library: $LIB_IMAGE_COMMON. Cannot continue."
+# Load functions designed for image processing
+if ! . "$(dirname "$0")/lib/cros_image_common.sh"; then
+  echo "ERROR: Cannot load required library: lib/cros_image_common.sh; Abort."
   exit 1
 fi
 
-if [ -z "$2" -o -z "$1" ]; then
+if [ -z "$2" -o -z "$1" ] || [ "${#@}" -ne 2 -a "${#@}" -ne 3 ]; then
   echo "usage: $0 path/to/kernel_partition_img path/to/rootfs_partition_img"
   echo "    or $0 path/to/chromiumos_img kern_part_no rootfs_part_no"
   exit 1
 fi
 
 if [ "$CROS_GENERATE_UPDATE_PAYLOAD_CALLED" != "1" ]; then
   echo "WARNING:"
   echo " This script should only be called from cros_generate_update_payload"
   echo " Please run that script with --help to see how to use it."
 fi
@@ skipping 75 matching lines @@
 set -- $CS_AND_RET_CODES
 CALC_CS="$1"
 shift
 RET_CODES="$@"
 if [ "$RET_CODES" != "$EXPECTED_RET_CODES" ]; then
   echo compression/hash failed. $RET_CODES
   exit 1
 fi
 
 echo Success. hash is "$CALC_CS"