blob: 2971b0874868e9710d65dbf4265a4cd7defcfb94 [file] [log] [blame]
# Copyright (c) 2013 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 remove /boot directory from an image.
# Load common constants. This should be the first executable line.
# The path to should be relative to your script's location.
. "$(dirname "$0")/"
DEFINE_string image "chromiumos_image.bin" \
"Input file name of Chrome OS image to strip /boot from, or path to rootfs."
# Parse command line.
FLAGS "$@" || exit 1
eval set -- "${FLAGS_ARGV}"
# Abort on error.
set -e
# Swiped/modifed from $SRC/src/scripts/base_library/
zero_free_space() {
local rootfs="$1"
info "Zeroing freespace in ${rootfs}"
sudo fstrim -v "${rootfs}"
strip_boot() {
local image=$1
local rootfs_dir=$(make_temp_dir)
if [[ -b "${image}" ]]; then
enable_rw_mount "${image}"
sudo mount "${image}" "${rootfs_dir}"
tag_as_needs_to_be_resigned "${rootfs_dir}"
# Mount image so we can modify it.
local loopdev=$(loopback_partscan "${image}")
mount_loop_image_partition "${loopdev}" 3 "${rootfs_dir}"
sudo rm -rf "${rootfs_dir}/boot" &&
info "/boot directory was removed."
# To prevent the files we just removed from the FS from remaining as non-
# zero trash blocks that bloat payload sizes, need to zero them. This was
# done when the image was built, but needs to be repeated now that we've
# modified it in a non-trivial way.
zero_free_space "${rootfs_dir}"
IMAGE=$(readlink -f "${FLAGS_image}")
if [[ ! -f "${IMAGE}" && ! -b "${IMAGE}" ]]; then
if [[ -z "${IMAGE}" ]]; then
die "Missing required argument: --from (image to update)"
strip_boot "${IMAGE}"