# Copyright 2020-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

inherit kernel-build toolchain-funcs

MY_P=linux-${PV%.*}
BASE_VER="$(ver_cut 1).$(ver_cut 2)"
GENPATCHES_P=genpatches-${PV%.*}-$(( ${PV##*.} + 7 ))
# https://koji.fedoraproject.org/koji/packageinfo?packageID=8
CONFIG_VER=5.10.12
CONFIG_HASH=836165dd2dff34e4f2c47ca8f9c803002c1e6530
GENTOO_CONFIG_VER=5.10.42
RESTRICT="mirror"

DESCRIPTION="Linux kernel built with Gentoo patches"
HOMEPAGE="https://www.kernel.org/"
SRC_URI+=" https://linux-libre.fsfla.org/pub/linux-libre/releases/${BASE_VER}-gnu1/linux-libre-${BASE_VER}-gnu1.tar.xz
	https://linux-libre.fsfla.org/pub/linux-libre/releases/${PV}-gnu1/patch-${BASE_VER}-gnu1-${PV}-gnu1.xz
	https://github.com/mgorny/gentoo-kernel-config/archive/v${GENTOO_CONFIG_VER}.tar.gz
		-> gentoo-kernel-config-${GENTOO_CONFIG_VER}.tar.gz
	amd64? (
		https://src.fedoraproject.org/rpms/kernel/raw/${CONFIG_HASH}/f/kernel-x86_64-fedora.config
			-> kernel-x86_64-fedora.config.${CONFIG_VER}
	)
	arm64? (
		https://src.fedoraproject.org/rpms/kernel/raw/${CONFIG_HASH}/f/kernel-aarch64-fedora.config
			-> kernel-aarch64-fedora.config.${CONFIG_VER}
	)
	ppc64? (
		https://src.fedoraproject.org/rpms/kernel/raw/${CONFIG_HASH}/f/kernel-ppc64le-fedora.config
			-> kernel-ppc64le-fedora.config.${CONFIG_VER}
	)
	x86? (
		https://src.fedoraproject.org/rpms/kernel/raw/${CONFIG_HASH}/f/kernel-i686-fedora.config
			-> kernel-i686-fedora.config.${CONFIG_VER}
	)"
S=${WORKDIR}/${MY_P}

LICENSE="GPL-2"
KEYWORDS="amd64 ~arm arm64 ppc64 x86"
IUSE="debug hardened"
REQUIRED_USE="arm? ( savedconfig )"

RDEPEND="
	!sys-kernel/gentoo-kernel-bin:${SLOT}"
BDEPEND="
	debug? ( dev-util/pahole )"
PDEPEND="
	>=virtual/dist-kernel-${PV}"

QA_FLAGS_IGNORED="usr/src/linux-.*/scripts/gcc-plugins/.*.so"

src_prepare() {
	local PATCHES=(
		"${WORKDIR}"/patch-${BASE_VER}-gnu1-${PV}-gnu1
	)
	default

	# prepare the default config
	case ${ARCH} in
		amd64)
			cp "${DISTDIR}/kernel-x86_64-fedora.config.${CONFIG_VER}" .config || die
			;;
		arm)
			return
			;;
		arm64)
			cp "${DISTDIR}/kernel-aarch64-fedora.config.${CONFIG_VER}" .config || die
			;;
		ppc64)
			cp "${DISTDIR}/kernel-ppc64le-fedora.config.${CONFIG_VER}" .config || die
			;;
		x86)
			cp "${DISTDIR}/kernel-i686-fedora.config.${CONFIG_VER}" .config || die
			;;
		*)
			die "Unsupported arch ${ARCH}"
			;;
	esac

	local myversion="-libre-dist"
	use hardened && myversion+="-hardened"
	echo "CONFIG_LOCALVERSION=\"${myversion}\"" > "${T}"/version.config || die
	local dist_conf_path="${WORKDIR}/gentoo-kernel-config-${GENTOO_CONFIG_VER}"


	local merge_configs=(
		"${T}"/version.config
		"${dist_conf_path}"/base.config
	)
	use debug || merge_configs+=(
		"${dist_conf_path}"/no-debug.config
	)
	if use hardened; then
		merge_configs+=( "${dist_conf_path}"/hardened-base.config )

		tc-is-gcc && merge_configs+=( "${dist_conf_path}"/hardened-gcc-plugins.config )

		if [[ -f "${dist_conf_path}/hardened-${ARCH}.config" ]]; then
			merge_configs+=( "${dist_conf_path}/hardened-${ARCH}.config" )
		fi
	fi
	kernel-build_merge_configs "${merge_configs[@]}"
}