#!/bin/bash

# Copyright (c) 2012 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 build a bootable keyfob-based chromeos system image from within
# a chromiumos setup. This assumes that all needed packages have been built into
# the given target's root with binary packages turned on. This script will
# build the Chrome OS image using only pre-built binary packages.

SCRIPT_ROOT="$(dirname "$(readlink -f "$0")")"
# shellcheck source=build_library/build_common.sh
. "${SCRIPT_ROOT}/build_library/build_common.sh" || exit 1

# Developer-visible flags.
DEFINE_string adjust_part "" \
  "Adjustments to apply to partition table (LABEL:[+-=]SIZE) e.g. ROOT-A:+1G"
DEFINE_string board "${DEFAULT_BOARD}" \
  "The board to build an image for."
DEFINE_string boot_args "noinitrd" \
  "Additional boot arguments to pass to the commandline"
DEFINE_boolean enable_bootcache ${FLAGS_FALSE} \
  "Default all bootloaders to NOT use boot cache."
DEFINE_boolean enable_rootfs_verification ${FLAGS_TRUE} \
  "Default all bootloaders to use kernel-based root fs integrity checking." \
  r
DEFINE_string output_root "${DEFAULT_BUILD_ROOT}/images" \
  "Directory in which to place image result directories (named by version)"
DEFINE_string disk_layout "default" \
  "The disk layout type to use for this image."
DEFINE_string enable_serial "" \
  "Enable serial port for printks. Example values: ttyS0"
DEFINE_integer loglevel 7 \
  "The loglevel to add to the kernel command line."
DEFINE_string builder_path "" \
  "The build_name to be installed on DUT during hwtest."


FLAGS_HELP="USAGE: build_image [flags] [list of images to build].
This script is used to build a Chromium OS image. Chromium OS comes in many
different forms.  This scripts can be used to build the following:

base - Pristine Chromium OS image. As similar to Chrome OS as possible.
dev [default] - Developer image. Like base but with additional dev packages.
test - Like dev, but with additional test specific packages and can be easily
  used for automated testing using scripts like test_that, etc.
factory_install - Install shim for bootstrapping the factory test process.
  Cannot be built along with any other image.

Examples:

build_image --board=<board> dev test - builds developer and test images.
build_image --board=<board> factory_install - builds a factory install shim.

Note if you want to build an image with custom size partitions, either consider
adding a new disk layout in build_library/legacy_disk_layout.json OR use
adjust_part. See the help above but here are a few examples:

adjust_part='STATE:+1G' -- add one GB to the size the stateful partition
adjust_part='ROOT-A:-1G' -- remove one GB from the primary rootfs partition
adjust_part='STATE:=1G' --  make the stateful partition 1 GB
...
"

# The following options are advanced options, only available to those willing
# to read the source code. They are not shown in help output, since they are
# not needed for the typical developer workflow.
DEFINE_integer build_attempt 1 \
  "The build attempt for this image build."
DEFINE_string build_root "${DEFAULT_BUILD_ROOT}/images" \
  "Directory in which to compose the image, before copying it to output_root."
DEFINE_integer jobs -1 \
  "How many packages to build in parallel at maximum."
DEFINE_boolean replace ${FLAGS_FALSE} \
  "Overwrite existing output, if any."
DEFINE_string symlink "latest" \
  "Symlink name to use for this image."
DEFINE_string version "" \
  "Overrides version number in name to this version."
DEFINE_string output_suffix "" \
  "Add custom suffix to output directory."
DEFINE_boolean eclean ${FLAGS_TRUE} \
  "Do NOT call eclean before building the image (default is to call eclean)."

# Parse command line.
FLAGS "$@" || exit 1

# See if we want to default the bootcache flag before we clobber
# the user's command line.  We want to default to false if the
# user explicitly disabled rootfs verification otherwise they
# have to manually specify both.
FLAGS_bootcache_use_board_default=${FLAGS_enable_rootfs_verification}
case " $* " in
  *" --enable_bootcache "*|\
  *" --noenable_bootcache "*)
    FLAGS_bootcache_use_board_default=${FLAGS_FALSE}
    ;;
esac

eval set -- "${FLAGS_ARGV}"

# Only now can we die on error. shflags functions leak non-zero error codes,
# so will die prematurely if 'switch_to_strict_mode' is specified before now.
switch_to_strict_mode

# Determine build version.
OVERLAY_CHROMEOS_DIR="${SRC_ROOT}/third_party/chromiumos-overlay/chromeos"
# shellcheck source=../third_party/chromiumos-overlay/chromeos/config/chromeos_version.sh
. "${OVERLAY_CHROMEOS_DIR}/config/chromeos_version.sh" || exit 1
# N.B.  Ordering matters for some of the libraries below, because
# some of the files contain initialization used by later files.
# shellcheck source=build_library/board_options.sh
. "${BUILD_LIBRARY_DIR}/board_options.sh" || exit 1
# shellcheck source=build_library/disk_layout_util.sh
. "${BUILD_LIBRARY_DIR}/disk_layout_util.sh" || exit 1
# shellcheck source=build_library/mount_gpt_util.sh
. "${BUILD_LIBRARY_DIR}/mount_gpt_util.sh" || exit 1
# shellcheck source=build_library/build_image_util.sh
. "${BUILD_LIBRARY_DIR}/build_image_util.sh" || exit 1
# shellcheck source=build_library/base_image_util.sh
. "${BUILD_LIBRARY_DIR}/base_image_util.sh" || exit 1
# shellcheck source=build_library/dev_image_util.sh
. "${BUILD_LIBRARY_DIR}/dev_image_util.sh" || exit 1
# shellcheck source=build_library/test_image_util.sh
. "${BUILD_LIBRARY_DIR}/test_image_util.sh" || exit 1
# shellcheck source=build_library/selinux_util.sh
. "${BUILD_LIBRARY_DIR}/selinux_util.sh" || exit 1

parse_build_image_args

load_board_specific_script "board_specific_setup.sh"

sudo_clear_shadow_locks "/build/${FLAGS_board}"

# TODO: <prebuild hook>

BASE_PACKAGE="virtual/target-os"
# Tweak flags, configure extra USE flags, and set base packages for the factory
# install shim.
if should_build_image "${CHROMEOS_FACTORY_INSTALL_SHIM_NAME}"; then
  # TODO: Build a separated ebuild for the install shim to reduce size.
  INSTALL_MASK="${FACTORY_SHIM_INSTALL_MASK}"

  # Add the cros_factory_install boot arg.
  FLAGS_boot_args="${FLAGS_boot_args} cros_factory_install"

  BASE_PACKAGE="virtual/target-os-factory-shim"

  export USE="${USE} fbconsole vtconsole factory_shim_ramfs i2cdev vfat"
fi

# Mask systemd directories if this is not a systemd image.
if ! has "systemd" "$("portageq-${FLAGS_board}" envvar USE)"; then
  COMMON_INSTALL_MASK+=" ${SYSTEMD_INSTALL_MASK}"
  DEFAULT_INSTALL_MASK+=" ${SYSTEMD_INSTALL_MASK}"
  FACTORY_SHIM_INSTALL_MASK+=" ${SYSTEMD_INSTALL_MASK}"
  INSTALL_MASK+=" ${SYSTEMD_INSTALL_MASK}"
fi

# TODO: </prebuild hook>

# If we are creating a developer image, also create a pristine image with a
# different name.
PRISTINE_IMAGE_NAME=
if should_build_image "${CHROMEOS_FACTORY_INSTALL_SHIM_NAME}"; then
  PRISTINE_IMAGE_NAME="${CHROMEOS_FACTORY_INSTALL_SHIM_NAME}"
else
  PRISTINE_IMAGE_NAME="${CHROMEOS_BASE_IMAGE_NAME}"
fi

if [[ ${FLAGS_eclean} -eq ${FLAGS_TRUE} ]]; then
  "${BOARD_ROOT}/build/bin/eclean" -d packages
fi

# Handle existing directory.
if [[ -e "${BUILD_DIR}" ]]; then
  if [[ ${FLAGS_replace} -eq ${FLAGS_TRUE} ]]; then
    sudo rm -rf "${BUILD_DIR}"
  else
    error "Directory ${BUILD_DIR} already exists."
    error "Use --build_attempt option to specify an unused attempt."
    error "Or use --replace if you want to overwrite this directory."
    die "Unwilling to overwrite ${BUILD_DIR}."
  fi
fi

# Create the output directory and temporary mount points.
mkdir -p "${BUILD_DIR}"

# Create the base image.
create_base_image "${PRISTINE_IMAGE_NAME}" \
  "${FLAGS_enable_rootfs_verification}" "${FLAGS_enable_bootcache}"

# Running board-specific setup if any exists.
if type board_setup &>/dev/null; then
  board_setup "${BUILD_DIR}/${PRISTINE_IMAGE_NAME}"
fi

# Create a developer image if an image that is based on it is requested.
if should_build_image "${CHROMEOS_DEVELOPER_IMAGE_NAME}" \
    "${CHROMEOS_TEST_IMAGE_NAME}"; then
  copy_image "${CHROMEOS_BASE_IMAGE_NAME}" "${CHROMEOS_DEVELOPER_IMAGE_NAME}"
  install_dev_packages "${CHROMEOS_DEVELOPER_IMAGE_NAME}"
fi

# From a developer image create a test image.
if should_build_image "${CHROMEOS_TEST_IMAGE_NAME}"; then
  copy_image  "${CHROMEOS_DEVELOPER_IMAGE_NAME}" "${CHROMEOS_TEST_IMAGE_NAME}"
  mod_image_for_test  "${CHROMEOS_TEST_IMAGE_NAME}"
fi

# Move the completed image to the output_root.
move_image "${BUILD_DIR}" "${OUTPUT_DIR}"

# Move DLC images to the output_root directory.
build_dlc --sysroot="${BOARD_ROOT}" --install-root-dir="${OUTPUT_DIR}"

# Create a named symlink.
LINK_NAME="${FLAGS_output_root}/${BOARD}/${FLAGS_symlink}"
ln -sfT "$(basename "${OUTPUT_DIR}")" "${LINK_NAME}"

info "Done. Image(s) created in ${OUTPUT_DIR}"
echo

# Print out the images we generated.
summarize() {
  local name="$1" img="$2"
  local dir_path

  # __flags_output_root_default defined in shflags.
  # shellcheck disable=2154
  if [[ "${FLAGS_output_root}" == "${__flags_output_root_default}" ]]; then
    dir_path=${OUTSIDE_OUTPUT_DIR}
  else
    dir_path="${OUTPUT_DIR}"
  fi

  info "${name} image created as ${img}"
  info "To copy the image to a USB key, use:"
  info "  cros flash usb:// ${dir_path}/${img}"
  info "To flash the image to a Chrome OS device, use:"
  info "  cros flash YOUR_DEVICE_IP ${dir_path}/${img}"
  info "Note that the device must be accessible over the network."
  info "A base image will not work in this mode, but a test or dev image will."
  if [[ $# -ge 3 ]]; then
    info "To convert it to a VM image, use:"
    info "  ./image_to_vm.sh --from=${dir_path} --board=${BOARD} $3"
  fi
  echo
}
if should_build_image "${CHROMEOS_BASE_IMAGE_NAME}"; then
  summarize "Non-developer Chromium OS" "${PRISTINE_IMAGE_NAME}"
fi
if should_build_image "${CHROMEOS_FACTORY_SHIM_NAME}"; then
  summarize "Chromium OS Factory install shim" "${PRISTINE_IMAGE_NAME}"
fi
if should_build_image "${CHROMEOS_DEVELOPER_IMAGE_NAME}"; then
  summarize "Developer" "${CHROMEOS_DEVELOPER_IMAGE_NAME}" ""
fi
if should_build_image "${CHROMEOS_TEST_IMAGE_NAME}"; then
  summarize "Test" "${CHROMEOS_TEST_IMAGE_NAME}" "--test"
fi

command_completed