src/scripts: remove all references to verity_depth

verify_rootfs_chksum.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 verify integrity of root file system for a GPT-based image
 
 # --- BEGIN COMMON.SH BOILERPLATE ---
 # Load common CrOS utilities.  Inside the chroot this file is installed in
@@ skipping 80 matching lines @@
 }
 
 get_partitions
 
 # Logic below extracted from src/platform/installer/chromeos-setimage
 DUMP_KERNEL_CONFIG=/usr/bin/dump_kernel_config
 KERNEL_CONFIG=$(sudo "${DUMP_KERNEL_CONFIG}" "${KERNEL_IMG}")
 kernel_cfg="$(echo "${KERNEL_CONFIG}" | sed -e 's/.*dm="\([^"]*\)".*/\1/g' |
               cut -f2- -d,)"
 rootfs_sectors=$(echo ${kernel_cfg} | cut -f2 -d' ')
-verity_depth=$(echo ${kernel_cfg} | cut -f7 -d' ')
 verity_algorithm=$(echo ${kernel_cfg} | cut -f8 -d' ')
 
 # Compute the rootfs hash tree
 VERITY=/bin/verity
-table="vroot none ro,"$(sudo "${VERITY}" create \
-        ${verity_depth} \
+# First argument to verity is reserved/unused and MUST be 0
+table="vroot none ro,"$(sudo "${VERITY}" create 0 \
         "${verity_algorithm}" \
         "${ROOTFS_IMG}" \
         $((rootfs_sectors / 8)) \
         /dev/null)
 
 expected_hash=$(echo ${kernel_cfg} | cut -f9 -d' ')
 generated_hash=$(echo ${table} | cut -f2- -d, | cut -f9 -d' ')
 
 cleanup
 
 if [ "${expected_hash}" != "${generated_hash}" ]; then
   warn "expected hash = ${expected_hash}"
   warn "actual hash = ${generated_hash}"
   die "Root filesystem has been modified unexpectedly!"
 else
   info "Root filesystem checksum match!"
 fi