# Copyright 2022-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

KERNEL_IUSE_GENERIC_UKI=1
KERNEL_IUSE_MODULES_SIGN=1

inherit kernel-build verify-sig

BASE_P=linux-${PV%.*}
PATCH_PV=${PV%_p*}
PATCHSET=linux-gentoo-patches-${PV}
GENTOO_CONFIG_P=gentoo-kernel-config-g19
SHA256SUM_DATE=20260601

XANMOD_VERSION="1"

DESCRIPTION="Linux kernel built with XanMod and Gentoo patches"
HOMEPAGE="https://www.kernel.org/ https://xanmod.org/"
SRC_URI="
	https://cdn.kernel.org/pub/linux/kernel/v$(ver_cut 1).x/${BASE_P}.tar.xz
	https://downloads.sourceforge.net/xanmod/patch-${PATCH_PV}-xanmod${XANMOD_VERSION}.xz
	https://distfiles.gentoo.org/pub/proj/dist-kernel/patchsets/$(ver_cut 1-2)/${PATCHSET}.tar.xz
	https://gitweb.gentoo.org/proj/dist-kernel/gentoo-kernel-config.git/snapshot/${GENTOO_CONFIG_P}.tar.bz2
	verify-sig? (
		https://cdn.kernel.org/pub/linux/kernel/v$(ver_cut 1).x/sha256sums.asc
			-> linux-$(ver_cut 1).x-sha256sums-${SHA256SUM_DATE}.asc
	)
"
S=${WORKDIR}/${BASE_P}

LICENSE="GPL-2"
KEYWORDS="-* ~amd64"

IUSE="debug"

RDEPEND="
	!sys-kernel/xanmod-kernel-bin:${SLOT}
"
BDEPEND="
	debug? ( dev-util/pahole )
	verify-sig? ( >=sec-keys/openpgp-keys-kernel-20250702 )
"
PDEPEND="
	>=virtual/dist-kernel-${PV}
"

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

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

src_unpack() {
	if use verify-sig; then
		cd "${DISTDIR}" || die
		verify-sig_verify_signed_checksums \
			"linux-$(ver_cut 1).x-sha256sums-${SHA256SUM_DATE}.asc" \
			sha256 "${BASE_P}.tar.xz"
		cd "${WORKDIR}" || die
	fi

	default
}

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

	default

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

	# prepare the default config
	case ${ARCH} in
		amd64)
			cp "${S}/CONFIGS/x86_64/config" .config || die
			;;
		*)
			die "Unsupported arch ${ARCH}"
			;;
	esac

	rm "${S}/localversion" || die
	local myversion="-xanmod${XANMOD_VERSION}-dist"
	echo "CONFIG_LOCALVERSION=\"${myversion}\"" > "${T}"/version.config || die
	local dist_conf_path="${WORKDIR}/${GENTOO_CONFIG_P}"

	local merge_configs=(
		"${T}"/version.config
		"${dist_conf_path}"/base.config
		"${dist_conf_path}"/6.12+.config
		"${FILESDIR}"/x86-64-native.config
	)
	use debug || merge_configs+=(
		"${dist_conf_path}"/no-debug.config
	)

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

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