New helper script to mount (and umount) gpt image into image_dir/rootfs and mount /var, /usr/local

src/scripts/mount_gpt_image.sh

Index: src/scripts/mount_gpt_image.sh
diff --git a/src/scripts/mount_gpt_image.sh b/src/scripts/mount_gpt_image.sh
new file mode 100755
index 0000000000000000000000000000000000000000..7d59ef4496a01b3e4f54361bf2a17a6d370174f0
--- /dev/null
+++ b/src/scripts/mount_gpt_image.sh
@@ -0,0 +1,100 @@
+#!/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 "$0")/common.sh"
+
+get_default_board
+
+# Flags.
+DEFINE_string board "$DEFAULT_BOARD" \
+  "The board for which the image was built." b
+DEFINE_boolean unmount $FLAGS_FALSE \
+  "Unmount previously mounted dir." u
+DEFINE_string from "/dev/sdc" \
+  "Directory containing image or device with image on it" f
+DEFINE_boolean test $FLAGS_FALSE "Use chromiumos_test_image.bin" t
+DEFINE_string "rootfs_mountpt" "/tmp/m" "Mount point for rootfs" "r"
+DEFINE_string "stateful_mountpt" "/tmp/s" \
+    "Mount point for stateful partition" "s"
+DEFINE_boolean most_recent ${FLAGS_FALSE} "Use the most recent image dir" m
+
+# Parse flags
+FLAGS "$@" || exit 1
+eval set -- "${FLAGS_ARGV}"
+
+# Die on error
+set -e
+
+# Common umounts for either a device or directory
+function unmount_common() {
+  echo "Unmounting image from ${FLAGS_stateful_mountpt}" \
+      "and ${FLAGS_rootfs_mountpt}"
+  # Don't die on error to force cleanup
+  set +e
+  if [ -e "${FLAGS_rootfs_mountpt}/root/.dev_mode" ] ; then
+    sudo umount "${FLAGS_rootfs_mountpt}/usr/local"
+  fi
+  sudo umount "${FLAGS_rootfs_mountpt}/var"
+  sudo umount -d "${FLAGS_stateful_mountpt}"
+  sudo umount -d "${FLAGS_rootfs_mountpt}"
+  set -e
+}
+
+# Sets up the rootfs and stateful partitions specified by
+# ${FLAGS_from}${prefix}[31] to the given mount points and sets up var and
+# usr/local
+# ${1} - prefix name for the partition
+# ${2} - extra mount options for the partitions
+function mount_common() {
+  mkdir -p "${FLAGS_rootfs_mountpt}"
+  mkdir -p "${FLAGS_stateful_mountpt}"
+  sudo mount ${2} "${FLAGS_from}${1}3" "${FLAGS_rootfs_mountpt}"
+  sudo mount ${2} "${FLAGS_from}${1}1" "${FLAGS_stateful_mountpt}"
+  sudo mount --bind "${FLAGS_stateful_mountpt}/var" \
+    "${FLAGS_rootfs_mountpt}/var"
+  if [ -e "${FLAGS_rootfs_mountpt}/root/.dev_mode" ] ; then
+    sudo mount --bind "${FLAGS_stateful_mountpt}/dev_image" \
+      "${FLAGS_rootfs_mountpt}/usr/local"
+  fi
+  echo "Root FS specified by "${FLAGS_from}${1}3" mounted at"\
+    "${FLAGS_rootfs_mountpt} successfully."
+}
+
+# Find the last image built on the board
+if [ ${FLAGS_most_recent} -eq ${FLAGS_TRUE} ] ; then
+  IMAGES_DIR="${DEFAULT_BUILD_ROOT}/images/${FLAGS_board}"
+  FLAGS_from="${IMAGES_DIR}/$(ls -t ${IMAGES_DIR} 2>&-| head -1)"
+fi
+
+# Turn into absolute path
+FLAGS_from=`eval readlink -f ${FLAGS_from}`
+
+# Set the file name of the image if ${FLAGS_from} is not a device and cd
+if [ -d "${FLAGS_from}" ] ; then
+  cd "${FLAGS_from}"
+  IMAGE_NAME=chromiumos_image.bin
+  [ ${FLAGS_test} -eq ${FLAGS_TRUE} ] && IMAGE_NAME=chromiumos_test_image.bin
+fi
+
+if [ ${FLAGS_unmount} -eq ${FLAGS_TRUE} ] ; then
+  unmount_common
+  if [ -d "${FLAGS_from}" ] ; then
+    echo "Re-packing partitions onto ${FLAGS_from}/${IMAGE_NAME}"
+    ./pack_partitions.sh ${IMAGE_NAME} 2> /dev/null
+    sudo rm part_*
+  fi
+else
+  if [ -b ${FLAGS_from} ] ; then
+    mount_common "" ""
+  else
+    echo "Unpacking partitions from ${FLAGS_from}/${IMAGE_NAME}"
+    ./unpack_partitions.sh ${IMAGE_NAME} 2> /dev/null
+    mount_common "/part_" "-o loop"
+  fi
+fi