Fixing of the symlinks isn't being called because rootfs is being remounted ro.

mount_gpt_image.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.
 
 # Helper script that mounts chromium os image from a device or directory
 # and creates mount points for /var and /usr/local (if in dev_mode).
 
 . "$(dirname "$0")/common.sh"
@@ skipping 29 matching lines @@
 # Die on error
 set -e
 
 # Common unmounts for either a device or directory
 function unmount_image() {
   echo "Unmounting image from ${FLAGS_stateful_mountpt}" \
       "and ${FLAGS_rootfs_mountpt}"
   # Don't die on error to force cleanup
   set +e
   # Reset symlinks in /usr/local.
-  if mount | egrep ".* ${FLAGS_rootfs_mountpt} .*\(rw,"; then
+  if mount | egrep ".* ${FLAGS_stateful_mountpt} .*\(rw,"; then
     setup_symlinks_on_root "/usr/local" "/var" \
       "${FLAGS_stateful_mountpt}"
     fix_broken_symlinks "${FLAGS_rootfs_mountpt}"
   fi
   sudo umount "${FLAGS_rootfs_mountpt}/usr/local"
   sudo umount "${FLAGS_rootfs_mountpt}/var"
   if [[ -n "${FLAGS_esp_mountpt}" ]]; then
     sudo umount -d "${FLAGS_esp_mountpt}"
   fi
   sudo umount -d "${FLAGS_stateful_mountpt}"
@@ skipping 80 matching lines @@
 
 # Turn path into an absolute path.
 FLAGS_from=`eval readlink -f ${FLAGS_from}`
 
 # Perform desired operation.
 if [ ${FLAGS_unmount} -eq ${FLAGS_TRUE} ] ; then
   unmount_image
 else
   mount_image
 fi