Add a "verify" option to sign_official_build.sh.

scripts/image_signing/common.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.
 
 # Determine script directory
 SCRIPT_DIR=$(dirname $0)
 PROG=$(basename $0)
 GPT=cgpt
@@ skipping 27 matching lines @@
 }
 
 # Extract a partition to a file
 # Args: IMAGE PARTNUM OUTPUTFILE
 extract_image_partition() {
   local image=$1
   local partnum=$2
   local output_file=$3
   local offset=$(partoffset "$image" "$partnum")
   local size=$(partsize "$image" "$partnum")
-  dd if=$image of=$output_file bs=512 skip=$offset count=$size conv=notrunc
+  dd if=$image of=$output_file bs=512 skip=$offset count=$size conv=notrunc >/dev/null 2>&1
 }
-  
+
 # Replace a partition in an image from file
 # Args: IMAGE PARTNUM INPUTFILE
 replace_image_partition() {
   local image=$1
   local partnum=$2
   local input_file=$3
   local offset=$(partoffset "$image" "$partnum")
   local size=$(partsize "$image" "$partnum")
   dd if=$input_file of=$image bs=512 seek=$offset count=$size conv=notrunc
 }
@@ skipping 25 matching lines @@
       sudo umount -d $i 2>/dev/null
       rm -rf $i
     fi
   done
   set -e
   rm -rf $TEMP_DIR_LIST $TEMP_FILE_LIST
 }
 
 trap "cleanup_temps_and_mounts" EXIT