#!/bin/bash

# Copyright (c) 2014 The CoreOS 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_ROOT=$(dirname "$(readlink -f "$0")")
. "${SCRIPT_ROOT}/common.sh" || exit 1

# Script must run inside the chroot
assert_inside_chroot

assert_not_root_user

DEFAULT_GROUP=developer

# Flags
DEFINE_string kernel_path "" \
    "Path to the kernel to inject."
DEFINE_string efi_grub_path "" \
    "Path to the EFI GRUB image to inject."
DEFINE_string shim_path "" \
    "Path to the shim image to inject."
DEFINE_string group "${DEFAULT_GROUP}" \
    "The update group."
DEFINE_string board "${DEFAULT_BOARD}" \
    "Board for which the image was built"
DEFINE_string disk_layout "base" \
    "The disk layout type to use for this image."
DEFINE_string from "" \
    "Directory containing ${FLATCAR_PRODUCTION_IMAGE_NAME}"
DEFINE_string output_root "${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."

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

show_help_if_requested "$@"

# Usually unneeded, so just leave this option hidden.
DEFINE_integer build_attempt 1 \
    "The build attempt for this image build."

# Parse command line
FLAGS "$@" || exit 1
eval set -- "${FLAGS_ARGV}"

# Die on any errors.
switch_to_strict_mode

check_gsutil_opts

if [[ -z "${FLAGS_kernel_path}" && -z "${FLAGS_efi_grub_path}" &&
        -z "${FLAGS_shim_path}" ]]; then
    die_notrace "Specify at least one of --kernel_path, --efi_grub_path, --shim_path"
fi

. "${BUILD_LIBRARY_DIR}/modify_image_util.sh"

do_copy() {
    local src="$1"
    local dst="$2"

    if [[ ! -f "${ROOT_FS_DIR}/${dst}" ]]; then
        # We should only be overwriting existing files.
        die "${dst} doesn't exist in image; refusing to create it"
    fi
    info "Replacing ${dst}"
    sudo cp "${src}" "${ROOT_FS_DIR}/${dst}"
}

start_modify_image

if [[ -n "${FLAGS_kernel_path}" ]]; then
    do_copy "${FLAGS_kernel_path}" "/boot/flatcar/vmlinuz-a"
fi

# FIXME(bgilbert): no shim on arm64
if [[ -n "${FLAGS_efi_grub_path}" ]]; then
    case "${BOARD}" in
    amd64-usr) image_name="grub.efi" ;;
    arm64-usr) image_name="bootaa64.efi" ;;
    *) die "GRUB filename not known for this board" ;;
    esac

    do_copy "${FLAGS_efi_grub_path}" "/boot/EFI/boot/${image_name}"
fi

if [[ -n "${FLAGS_shim_path}" ]]; then
    case "${BOARD}" in
    amd64-usr) image_name="bootx64.efi" ;;
    *) die "Shim filename not known for this board" ;;
    esac

    do_copy "${FLAGS_shim_path}" "/boot/EFI/boot/${image_name}"
fi

finish_modify_image
command_completed