#!/bin/bash

# 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.

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


DEFINE_string board "${DEFAULT_BOARD}" \
  "The board to build an image for."
DEFINE_string build_root "/build" \
  "The root location for board sysroots."
DEFINE_integer build_attempt 1 \
  "The build attempt for this image build."
DEFINE_string output_root "${DEFAULT_BUILD_ROOT}/images" \
  "Directory in which to place image result directories (named by version)"
DEFINE_boolean replace ${FLAGS_FALSE} \
  "Overwrite existing output, if any."
DEFINE_boolean withdev ${FLAGS_TRUE} \
  "Include useful developer friendly utilities in the image."
DEFINE_integer jobs -1 \
  "How many packages to build in parallel at maximum."
DEFINE_boolean statefuldev ${FLAGS_TRUE} \
  "Install development packages on stateful partition rather than the rootfs"
DEFINE_boolean test ${FLAGS_FALSE} \
  "Modify the image for automated testing"
DEFINE_boolean factory ${FLAGS_FALSE} \
  "Modify the image for manufacturing testing"
DEFINE_boolean factory_install ${FLAGS_FALSE} \
  "Build a smaller image to overlay the factory install shim on; this argument \
is also required in image_to_usb."
DEFINE_integer rootfs_partition_size 1024 \
  "rootfs partition size in MiBs."
DEFINE_integer rootfs_size 850 \
  "rootfs filesystem size in MiBs."
# ceil(0.1 * rootfs_size) is a good minimum.
DEFINE_integer rootfs_hash_pad 8 \
  "MiBs reserved at the end of the rootfs image."
DEFINE_integer statefulfs_size 1024 \
  "stateful filesystem size in MiBs."
DEFINE_boolean fast ${DEFAULT_FAST} \
  "Call many emerges in parallel"
DEFINE_string boot_args "noinitrd" \
  "Additional boot arguments to pass to the commandline"

DEFINE_string usb_disk /dev/sdb3 \
  "Path syslinux should use to do a usb boot. Default: /dev/sdb3"

DEFINE_boolean enable_rootfs_verification ${FLAGS_TRUE} \
  "Default all bootloaders to use kernel-based root fs integrity checking."
DEFINE_integer verity_error_behavior 3 \
  "Kernel verified boot error behavior (0: I/O errors, 1: panic, 2: nothing, \
3: cros) Default: 3"
DEFINE_integer verity_max_ios -1 \
  "Number of outstanding I/O operations dm-verity caps at. Default: -1"
DEFINE_string verity_algorithm "sha1" \
  "Cryptographic hash algorithm used for kernel vboot. Default : sha1"
DEFINE_string verity_salt "" \
  "Root filesystem salt. Default: randomly generated."
DEFINE_boolean standard_backdoor ${FLAGS_TRUE} \
  "Install standard backdoor credentials for testing"
DEFINE_string symlink "latest" \
  "Symlink name to use for this image."

# TODO(clchiou): Remove this flag after buildbot is fixed
DEFINE_boolean crosbug12352_arm_kernel_signing ${FLAGS_TRUE} \
  "A dummy this flag for preventing buildbot fail"

# 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 'set -e' is specified before now.
set -e

# Determine build version.
OVERLAY_CHROMEOS_DIR="${SRC_ROOT}/third_party/chromiumos-overlay/chromeos"
. "${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.
. "${BUILD_LIBRARY_DIR}/board_options.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/build_gpt.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
. "${BUILD_LIBRARY_DIR}/test_image_util.sh" || exit 1
. "${BUILD_LIBRARY_DIR}/test_image_content.sh" || exit 1

# Look at flags to determine which image types we should build
if [ ${FLAGS_factory_install} -eq ${FLAGS_TRUE} ]; then
  if [ ${FLAGS_factory} -eq ${FLAGS_TRUE} ]; then
    info "Incompatible flags: --factory and --factory_install cannot both be \
set to True. Resetting --factory to False."
    FLAGS_factory=${FLAGS_FALSE}
  fi
  if [ ${FLAGS_test} -eq ${FLAGS_TRUE} ]; then
    info "Incompatible flags: --test and --factory_install cannot both be \
set to True. Resetting --test to False."
    FLAGS_test=${FLAGS_FALSE}
  fi
  # Disable --withdev flag when --factory_install is set to True. Otherwise, the
  # dev image produced will be based on install shim, rather than a pristine
  # image
  if [ ${FLAGS_withdev} -eq ${FLAGS_TRUE} ]; then
    info "Incompatible flags: --withdev and --factory_install cannot both be \
set to True. Resetting --withdev to False."
    FLAGS_withdev=${FLAGS_FALSE}
  fi
fi
if [ ${FLAGS_factory} -eq ${FLAGS_TRUE} ]; then
  if [ ${FLAGS_test} -eq ${FLAGS_FALSE} ]; then
    info "Incompatible flags: --factory implies --test. Resetting --test to \
True."
    FLAGS_test=${FLAGS_TRUE}
  fi
fi
if [ ${FLAGS_test} -eq ${FLAGS_TRUE} ]; then
  if [ ${FLAGS_withdev} -eq ${FLAGS_FALSE} ]; then
    info "Incompatible flags: --test implies --withdev. Resetting --withdev \
to True."
    FLAGS_withdev=${FLAGS_TRUE}
  fi
fi

# Tweak flags for factory install.
if [ ${FLAGS_factory_install} -eq ${FLAGS_TRUE} ]; then
  # TODO: Build a separated ebuild for the install shim to reduce size.
  INSTALL_MASK="${INSTALL_MASK} ${FACTORY_INSTALL_MASK}"

  # Reduce the size of factory install shim.
  info "Fixing the rootfs size at 300 MiB for install shim"
  FLAGS_rootfs_size=280
  FLAGS_rootfs_partition_size=300
  info "Fixing the statefulfs size at 140 MiB for install shim"
  FLAGS_statefulfs_size=140

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

if [ $((FLAGS_rootfs_size + FLAGS_rootfs_hash_pad)) -gt \
     ${FLAGS_rootfs_partition_size} ] ; then
  die "rootfs ($((FLAGS_rootfs_size + FLAGS_rootfs_hash_pad)) MiB) is \
bigger than partition (${FLAGS_rootfs_partition_size} MiB)."
fi

# If we are creating a developer image, also create a pristine image with a
# different name.
# TODO(vlaviano): fix all image names to match those in uploaded archive
DEVELOPER_IMAGE_NAME=
PRISTINE_IMAGE_NAME=chromiumos_image.bin
if [ ${FLAGS_withdev} -eq ${FLAGS_TRUE} ]; then
  PRISTINE_IMAGE_NAME=chromiumos_base_image.bin
  DEVELOPER_IMAGE_NAME=chromiumos_image.bin
# Rename pristine image for factory install shim
elif [ ${FLAGS_factory_install} -eq ${FLAGS_TRUE} ]; then
  PRISTINE_IMAGE_NAME=factory_install_shim.bin
fi

PRISTINE_IMG="${OUTPUT_DIR}/${PRISTINE_IMAGE_NAME}"
DEVELOPER_IMG="${OUTPUT_DIR}/${DEVELOPER_IMAGE_NAME}"
TEST_IMG="${OUTPUT_DIR}/${CHROMEOS_TEST_IMAGE_NAME}"
FACTORY_IMG="${OUTPUT_DIR}/${CHROMEOS_FACTORY_TEST_IMAGE_NAME}"

ROOT_FS_DIR="${OUTPUT_DIR}/rootfs"
STATEFUL_FS_DIR="${OUTPUT_DIR}/stateful_partition"
ESP_FS_DIR=${OUTPUT_DIR}/esp

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

# ${DEV_IMAGE_ROOT} specifies the location of where developer packages will
# be installed on the stateful dir.  On a Chromium OS system, this will
# translate to /usr/local.
DEV_IMAGE_ROOT="${STATEFUL_FS_DIR}/dev_image"

eclean-$BOARD -d packages

check_blacklist

# Check that the build root is sane.
"${BUILD_LIBRARY_DIR}/test_build_root" --root="${BOARD_ROOT}"

# 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 "${OUTPUT_DIR}" ]]; then
  if [[ ${FLAGS_replace} -eq ${FLAGS_TRUE} ]]; then
    sudo rm -rf "${OUTPUT_DIR}"
  else
    echo "Directory ${OUTPUT_DIR} already exists."
    echo "Use --build_attempt option to specify an unused attempt."
    echo "Or use --replace if you want to overwrite this directory."
    exit 1
  fi
fi

# Create the output directory and temporary mount points.
mkdir -p "${OUTPUT_DIR}"
mkdir -p "${ROOT_FS_DIR}" "${STATEFUL_FS_DIR}" "${ESP_FS_DIR}"

# Create the boot.desc file which stores the build-time configuration
# information needed for making the image bootable after creation with
# cros_make_image_bootable.
create_boot_desc

create_base_image "$PRISTINE_IMAGE_NAME"


BOOT_FLAG=
if [ ${FLAGS_factory_install} -eq ${FLAGS_TRUE} ]; then
  BOOT_FLAG="-b 1"  # BOOT_FLAG_DEVELOPER value defined in load_kernel_fw.h
  info "--factory_install set, pass BOOT_FLAG_DEVELOPER flag to \
load_kernel_test"
fi

# Verify the final image.
load_kernel_test "${OUTPUT_DIR}/${PRISTINE_IMAGE_NAME}" \
  "${DEVKEYSDIR}/recovery_key.vbpubk" ${BOOT_FLAG}

# Create a developer image based on the chromium os base image.
if [ ${FLAGS_withdev} -eq ${FLAGS_TRUE} ]; then
  copy_image "$PRISTINE_IMG" "$DEVELOPER_IMG"
  install_dev_packages "$DEVELOPER_IMAGE_NAME"
fi

# Create a test or factory test image if desired
if [ ${FLAGS_factory} -eq ${FLAGS_TRUE} ]; then
  copy_image "$DEVELOPER_IMG" "$FACTORY_IMG"
  mod_image_for_test "${FACTORY_IMG}"
elif [ ${FLAGS_test} -eq ${FLAGS_TRUE} ]; then
  copy_image "$DEVELOPER_IMG" "$TEST_IMG"
  mod_image_for_test "${TEST_IMG}"
fi

rmdir "${ROOT_FS_DIR}" "${STATEFUL_FS_DIR}" "${ESP_FS_DIR}"

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

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

echo "Done.  Image created in ${OUTPUT_DIR}"
echo "Chromium OS image created as ${PRISTINE_IMAGE_NAME}"
if [ ${FLAGS_withdev} -eq ${FLAGS_TRUE} ]; then
  echo "Developer image created as ${DEVELOPER_IMAGE_NAME}"
fi
if [ ${FLAGS_factory} -eq ${FLAGS_TRUE} ]; then
  echo "Factory test image created as ${CHROMEOS_FACTORY_TEST_IMAGE_NAME}"
elif [ ${FLAGS_test} -eq ${FLAGS_TRUE} ]; then
  echo "Test image created as ${CHROMEOS_TEST_IMAGE_NAME}"
fi

print_time_elapsed

echo "To copy to USB keyfob, do something like:"
echo "  ./image_to_usb.sh --from=${OUTSIDE_OUTPUT_DIR} --to=/dev/sdX"
echo "To convert to VMWare image, INSIDE the chroot, do something like:"
echo "  ./image_to_vm.sh --from=${OUTSIDE_OUTPUT_DIR} --board=${BOARD}"
echo "from the scripts directory where you entered the chroot."