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#!/bin/bash

# Copyright (c) 2015 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

restart_in_chroot_if_needed "$@"

assert_not_root_user

# Flags

DEFINE_string board "${DEFAULT_BOARD}" \

"Board to use for kernel source and architecture."

DEFINE_string overlay "coreos" \

"Portage repo containing the kernel ebuild."

DEFINE_string package "sys-kernel/coreos-modules" \

"Portage ebuild name for the kernel."

# Parse command line

FLAGS "$@" || exit 1

eval set -- "${FLAGS_ARGV}"

# Die on any errors.

switch_to_strict_mode

if [[ -z "${FLAGS_board}" ]] ; then

die_notrace "--board is required."

fi

. "${BUILD_LIBRARY_DIR}/toolchain_util.sh"

. "${BUILD_LIBRARY_DIR}/board_options.sh"

KERNEL_ARCH=$(get_kernel_arch "${CHOST}")

KERNEL_CLFAGS="-nopie -fstack-check=no"

KERNEL_SRC="${BOARD_ROOT}/usr/src/linux"

if [[ ! -f "${KERNEL_SRC}/Makefile" ]]; then

die_notrace "No kernel source found at ${KERNEL_SRC}"

fi

KERNEL_BUILD=$(mktemp -d)

trap "rm -rf '${KERNEL_BUILD}'" EXIT

# Set up a ccache friendly build tree

mkdir -p "${KERNEL_BUILD}/build"

ln -s "${KERNEL_SRC}"/* "${KERNEL_BUILD}"

if [[ -d /usr/lib/ccache/bin ]]; then

export PATH="/usr/lib/ccache/bin:${PATH}"

export CCACHE_BASEDIR="${KERNEL_BUILD}"

fi

kmake() {

make -C "${KERNEL_BUILD}" \

ARCH="${KERNEL_ARCH}" \

CROSS_COMPILE="${CHOST}-" \

KBUILD_OUTPUT="build" \

KCFLAGS="${KERNEL_CFLAGS}" \

LDFLAGS="" \

"$@"

}

kmake_var() {

echo -e "e:\\n\\t@echo \$(${1})\\ninclude Makefile" | kmake -s -f -

}

KERNEL_MAJOR=$(kmake_var VERSION)

KERNEL_MINOR=$(kmake_var PATCHLEVEL)

OVERLAY=$(portageq get_repo_path / "${FLAGS_overlay}")

FILESDIR="${OVERLAY}/${FLAGS_package}/files"

DEFCONFIG_NAME="${ARCH}_defconfig-${KERNEL_MAJOR}.${KERNEL_MINOR}"

DEFCONFIG_PATH="${FILESDIR}/${DEFCONFIG_NAME}"

COMMONCONFIG_NAME="commonconfig-${KERNEL_MAJOR}.${KERNEL_MINOR}"

COMMONCONFIG_PATH="${FILESDIR}/${COMMONCONFIG_NAME}"

cat "${DEFCONFIG_PATH}" "${COMMONCONFIG_PATH}" > "${KERNEL_BUILD}/build/.config"

kmake olddefconfig

cp "${KERNEL_BUILD}/build/.config" "${KERNEL_BUILD}/build/.config.bak"

kmake menuconfig

kmake savedefconfig

diff -u "${KERNEL_BUILD}/build/.config.bak" "${KERNEL_BUILD}/build/.config" || true