| # Copyright (c) 2011 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. |
| |
| # This global array variable is used to remember options from |
| # mount_image so that unmount_image can do its job. |
| MOUNT_GPT_OPTIONS=( ) |
| |
| # Usage: _check_mount_image_flags [mode_flag ...] |
| # |
| # Check that all the passed flags only modify the read or write access of the |
| # mounted image when passed to mount_gpt_image.sh. |
| # Args: |
| # mode_flag ...: 0 or more flags. |
| _check_mount_image_flags() { |
| local flag |
| for flag; do |
| case "${flag}" in |
| --read_only|--safe) ;; |
| *) |
| die "Invalid flag '${flag}'." |
| esac |
| done |
| } |
| |
| # Usage: mount_image image rootfs_mountpt stateful_mountpt esp_mountpt \ |
| # [esp_mount] [mode_flag] |
| # |
| # Mount the root, stateful, and optionally ESP partitions in a Chromium OS |
| # image. Create the mountpoints when needed. |
| # Args: |
| # image: path to image to be mounted. |
| # rootfs_mountpt: path to root fs mount point. |
| # stateful_mountpt: path to stateful fs mount point. |
| # esp_mount: optional path to ESP fs mount point; if empty the ESP will not be |
| # mounted. |
| # mode_flag: Optional flag to control how the image is mounted: |
| # --read-only mounts all partitions as read-only. |
| # --safe, mounts only the rootfs as read-only and the rest as read/write. |
| # If omitted, the image will be mounted read-write. See mount_gpt_image.sh |
| # for details on these flags. |
| mount_image() { |
| MOUNT_GPT_OPTIONS=( |
| --from "$1" |
| --rootfs_mountpt "$2" |
| --stateful_mountpt "$3" |
| ) |
| |
| if [[ -n "${4:-}" ]]; then |
| MOUNT_GPT_OPTIONS+=( --esp_mountpt "$4" ) |
| fi |
| local mode_flag=() |
| if [[ -n "${5:-}" ]]; then |
| mode_flag+=("$5") |
| fi |
| _check_mount_image_flags "${mode_flag[@]}" |
| |
| "${SCRIPTS_DIR}/mount_gpt_image.sh" "${MOUNT_GPT_OPTIONS[@]}" \ |
| "${mode_flag[@]}" |
| } |
| |
| # Usage: unmount_image |
| # Unmount the file systems mounted in the previous call to mount_image. The |
| # mountpoint directories will be removed, regardless of whether or not they |
| # existed when mount_image was called. |
| # No arguments. |
| unmount_image() { |
| if [[ ${#MOUNT_GPT_OPTIONS[@]} -eq 0 ]]; then |
| warn "Image already unmounted." |
| return 1 |
| fi |
| "${SCRIPTS_DIR}/mount_gpt_image.sh" --unmount "${MOUNT_GPT_OPTIONS[@]}" \ |
| --delete_mountpts |
| |
| MOUNT_GPT_OPTIONS=( ) |
| } |
| |
| # Usage: get_board_from_image [image] |
| # |
| # Echoes the board name specified in the image. |
| get_board_from_image() { |
| local image=$1 |
| local dir="$(mktemp -d)" |
| local rootfs="${dir}/rootfs" |
| local stateful="${dir}/stateful" |
| ( |
| trap "unmount_image > /dev/null; rm -rf ${dir}" EXIT |
| mount_image "${image}" "${rootfs}" "${stateful}" > /dev/null |
| echo "$(sed -n '/^CHROMEOS_RELEASE_BOARD=/s:^[^=]*=::p' \ |
| "${rootfs}/etc/lsb-release")" |
| ) |
| } |