cros_make_image_bootable: Do a final sanity check on the rootfs by running e2fsck

bin/cros_make_image_bootable

 #!/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 which ensures that a given image has an up-to-date
 # kernel partition, rootfs integrity hashes, and legacy bootloader configs.
 
 # Load common constants.  This should be the first executable line.
@@ skipping 232 matching lines @@
     --vmlinuz="${FLAGS_rootfs_mountpoint}"/boot/vmlinuz \
     --usb_disk="${usb_disk}" \
     ${bootloader_to_flags} \
     $kernel_part
 
   trap - EXIT
   ${SCRIPTS_DIR}/mount_gpt_image.sh -u -r "${FLAGS_rootfs_mountpoint}" \
     -s "${FLAGS_statefulfs_mountpoint}"
 }
 
+verify_image_rootfs() {
+  local image=$1
+  local rootfs_offset="$(partoffset ${image} 3)"
+  local rootfs_size="$(partsize ${image} 3)"
+
+  local rootfs_tmp_file=$(mktemp)
+  trap "rm ${rootfs_tmp_file}" EXIT
+  sudo dd if="${image}" of="${rootfs_tmp_file}" bs=512 skip="${rootfs_offset}"
+
+  # This flips the read-only compatibility flag, so that
+  # e2fsck does not complain about unknown file system capabilities.
+  enable_rw_mount "${rootfs_tmp_file}"
+  info "Running e2fsck to check root file system for errors"
+  sudo e2fsck -fn "${rootfs_tmp_file}" ||
+    die "Root file system has errors, please ensure boot.desc and/or \
+command line parameters are correct"
+}
+
 # Use default of current image location if the output dir doesn't exist.
 if [ ! -d ${FLAGS_output_dir} ]; then
   warn "Output dir not found, using ${IMAGE_DIR}."
   FLAGS_output_dir="${IMAGE_DIR}"
   FLAGS_rootfs_hash="${IMAGE_DIR}/rootfs.hash"
   FLAGS_rootfs_mountpoint="${IMAGE_DIR}/rootfs_dir"
   FLAGS_statefulfs_mountpoint="${IMAGE_DIR}/stateful_dir"
   FLAGS_espfs_mountpoint="${IMAGE_DIR}/esp"
 fi
 
 # Create the directories if they don't exist.
 mkdir -p ${FLAGS_rootfs_mountpoint}
 mkdir -p ${FLAGS_statefulfs_mountpoint}
 mkdir -p ${FLAGS_espfs_mountpoint}
 
-make_image_bootable ${IMAGE}
+make_image_bootable "${IMAGE}"
+verify_image_rootfs "${IMAGE}"
 
 if [ ${FLAGS_cleanup_dirs} -eq ${FLAGS_TRUE} ]; then
   rmdir ${FLAGS_rootfs_mountpoint}
   rmdir ${FLAGS_statefulfs_mountpoint}
   rmdir ${FLAGS_espfs_mountpoint}
 fi