# Copyright 2020-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

KERNEL_IUSE_GENERIC_UKI=1

inherit kernel-build toolchain-funcs

BASE_P=linux-${PV%.*}
PATCH_PV=${PV%_p*}
PATCHSET=linux-gentoo-patches-6.18.16
# https://koji.fedoraproject.org/koji/packageinfo?packageID=8
# forked to https://github.com/projg2/fedora-kernel-config-for-gentoo
CONFIG_VER=6.18.25
GENTOO_CONFIG_VER=g18

DESCRIPTION="Linux kernel built with Gentoo patches"
HOMEPAGE="
	https://wiki.gentoo.org/wiki/Project:Distribution_Kernel
	https://www.kernel.org/
"
SRC_URI+="
	https://cdn.kernel.org/pub/linux/kernel/v$(ver_cut 1).x/${BASE_P}.tar.xz
	https://cdn.kernel.org/pub/linux/kernel/v$(ver_cut 1).x/patch-${PATCH_PV}.xz
	https://distfiles.gentoo.org/pub/proj/dist-kernel/patchsets/$(ver_cut 1-2)/${PATCHSET}.tar.xz
	https://github.com/projg2/gentoo-kernel-config/archive/${GENTOO_CONFIG_VER}.tar.gz
		-> gentoo-kernel-config-${GENTOO_CONFIG_VER}.tar.gz
	https://gitlab.fem-net.de/gentoo/kernel-configs/-/raw/master/kernel-xen-domu-x86_64.config.${CONFIG_VER}
"
S=${WORKDIR}/${BASE_P}

KEYWORDS="-* ~amd64"
IUSE="debug hardened"
REQUIRED_USE="
	arm? ( savedconfig )
	hppa? ( savedconfig )
	sparc? ( savedconfig )
"

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

QA_FLAGS_IGNORED="
	usr/src/linux-.*/scripts/gcc-plugins/.*.so
	usr/src/linux-.*/vmlinux
	usr/src/linux-.*/arch/powerpc/kernel/vdso.*/vdso.*.so.dbg
"

VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/kernel.org.asc

src_prepare() {
	local patch
	eapply "${WORKDIR}/patch-${PATCH_PV}"
	eapply "${WORKDIR}/${PATCHSET}"

	default

	# add Gentoo patchset version
	local extraversion=${PV#${PATCH_PV}}
	sed -i -e "s:^\(EXTRAVERSION =\).*:\1 ${extraversion/_/-}:" Makefile || die

	local biendian=false

	# prepare the default config
	case ${ARCH} in
		arm | hppa | loong | sparc)
			> .config || die
		;;
		amd64)
			cp "${DISTDIR}/kernel-xen-domu-x86_64.config.${CONFIG_VER}" .config || die
			;;
		*)
			die "Unsupported arch ${ARCH}"
			;;
	esac

	local myversion="-femxen"
	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
		"${dist_conf_path}"/6.12+.config
	)
	use debug || merge_configs+=(
		"${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

	# this covers ppc64 and aarch64_be only for now
	if [[ ${biendian} == true && $(tc-endian) == big ]]; then
		merge_configs+=( "${dist_conf_path}/big-endian.config" )
	fi

	use secureboot && merge_configs+=(
		"${dist_conf_path}/secureboot.config"
		"${dist_conf_path}/zboot.config"
	)

	kernel-build_merge_configs "${merge_configs[@]}"
}