#!/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 coreos 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 "$0"))
. "${SCRIPT_ROOT}/build_library/build_common.sh" || exit 1

# Developer-visible flags.
DEFINE_string adjust_part "" \
  "Adjustments to apply to the partition table"
DEFINE_string board "${DEFAULT_BOARD}" \
  "The board to build an image for."
DEFINE_string boot_args "" \
  "Additional boot arguments to pass to the commandline"
DEFINE_boolean enable_rootfs_verification ${FLAGS_TRUE} \
  "Default all bootloaders to use kernel-based root fs integrity checking."
DEFINE_string output_root "${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."

# include upload options
. "${BUILD_LIBRARY_DIR}/release_util.sh" || exit 1

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

base - Pristine CoreOS image for generating update payloads or a dev/prod image.
prod - Production image for CoreOS. This image is for booting.
dev - Developer image. Like base but with additional developer packages.

Examples:

build_image --board=<board> dev prod - builds developer and production images.
...
"
show_help_if_requested "$@"

# 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_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."

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

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

check_gsutil_opts

# N.B.  Ordering matters for some of the libraries below, because
# some of the files contain initialization used by later files.
. "${BUILD_LIBRARY_DIR}/toolchain_util.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/board_options.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/disk_layout_util.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/mount_gpt_util.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/build_image_util.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/base_image_util.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/dev_image_util.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/test_image_content.sh" || exit 1

parse_build_image_args

for overlay in $(cros_list_overlays --board "$BOARD"); do
  setup_sh="${overlay}/scripts/board_specific_setup.sh"
  if [[ -e ${setup_sh} ]]; then
    source "${setup_sh}"
  fi
done

BASE_PACKAGE="coreos-base/coreos"

PRISTINE_IMAGE_NAME=${CHROMEOS_BASE_IMAGE_NAME}

DEVKEYSDIR="/usr/share/vboot/devkeys"

eclean-$BOARD -d packages

if [[ ${skip_blacklist_check} -ne 1 ]]; then
  check_blacklist
fi

# Check that the build root is sane.
if [[ ${skip_test_build_root} -ne 1 ]]; then
  "${BUILD_LIBRARY_DIR}/test_build_root" --root="${BOARD_ROOT}"
fi

# Hack to fix bug where x86_64 CHOST line gets incorrectly added.
# ToDo(msb): remove this hack.
PACKAGES_FILE="${BOARD_ROOT}/packages/Packages"
sudo sed -e "s/CHOST: x86_64-pc-linux-gnu//" -i "${PACKAGES_FILE}"

# 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}
if should_build_image ${PRISTINE_IMAGE_NAME}; then
  upload_image "${BUILD_DIR}/${PRISTINE_IMAGE_NAME}"
fi

# 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}; then
  if should_build_image ${COREOS_PRODUCTION_IMAGE_NAME}; then
    cp "${BUILD_DIR}/${PRISTINE_IMAGE_NAME}" \
        "${BUILD_DIR}/${CHROMEOS_DEVELOPER_IMAGE_NAME}"
  else
    copy_image ${PRISTINE_IMAGE_NAME} ${CHROMEOS_DEVELOPER_IMAGE_NAME}
  fi
  install_dev_packages ${CHROMEOS_DEVELOPER_IMAGE_NAME}
  upload_image "${BUILD_DIR}/${CHROMEOS_DEVELOPER_IMAGE_NAME}"
fi

if should_build_image ${COREOS_PRODUCTION_IMAGE_NAME}; then
  copy_image ${CHROMEOS_BASE_IMAGE_NAME} ${COREOS_PRODUCTION_IMAGE_NAME}

  ${SCRIPTS_DIR}/bin/cros_make_image_bootable \
    "${BUILD_DIR}" \
     ${COREOS_PRODUCTION_IMAGE_NAME} \
    --production_track="dev-channel" \
    --au_key=${SRC_ROOT}/third_party/coreos-overlay/coreos-base/coreos-au-key/files/update-payload-key.pub.pem

  upload_image "${BUILD_DIR}/${COREOS_PRODUCTION_IMAGE_NAME}"
fi

if ! should_build_image ${PRISTINE_IMAGE_NAME}; then
  rm -f "${BUILD_DIR}/${PRISTINE_IMAGE_NAME}"
fi

# Generating AU generator zip file to run outside chroot
generate_au_zip || echo "Failed generating AU zip file - ignoring Error..."

# Write out a version.txt file, this will be used by image_to_vm.sh
tee "${BUILD_DIR}/version.txt" <<EOF
COREOS_BUILD=${COREOS_BUILD}
COREOS_BRANCH=${COREOS_BRANCH}
COREOS_PATCH=${COREOS_PATCH}
COREOS_SDK_VERSION=${COREOS_SDK_VERSION}
EOF

upload_image "${BUILD_DIR}/au-generator.zip" "${BUILD_DIR}/version.txt"

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

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

print_image_to_vm() {
  flags=
  if [ $# = 1 ]; then
    flags="--${1}_image"
  fi

  cat << EOF
To convert it to a virtual machine image, use:
  ./image_to_vm.sh --from=${OUTSIDE_OUTPUT_DIR} --board=${BOARD} ${flags}

The default type is qemu, see ./image_to_vm.sh --help for other options.
EOF
}

# Print out the images we generated.
if should_build_image ${COREOS_PRODUCTION_IMAGE_NAME}; then
  echo "CoreOS Production image created as ${COREOS_PRODUCTION_IMAGE_NAME}"
  print_image_to_vm "prod"
fi
if should_build_image ${CHROMEOS_BASE_IMAGE_NAME}; then
  echo "Non-developer CoreOS image created as ${PRISTINE_IMAGE_NAME}"
fi
if should_build_image ${CHROMEOS_DEVELOPER_IMAGE_NAME}; then
  echo "Developer image created as ${CHROMEOS_DEVELOPER_IMAGE_NAME}"
  print_image_to_vm
fi

command_completed