# Contributor: Natanael Copa <ncopa@alpinelinux.org>
# Contributor: Alex Denes <caskd@redxen.eu>
# Maintainer: Alex Denes <caskd@redxen.eu>

   pkgname=linux
  majorver=6
  minorver=4
  patchver=6

_configs="
	config-full.x86_64
	config-slim.x86_64

	config-rockpro64.aarch64
	config-bananapi_m2b.armhf
	config-bananapi_m2z.armhf
"

# https://github.com/Scrumplex/community-patches/raw/503b977cfe18f0ba367f4dd559f3529ef4834b15/linux61-tkg/cap_sys_nice_begone.mypatch
_patches="
	cap_sys_nice_begone.patch
"

pkgver="$majorver.$minorver"
pkgrel=0
if [ "$patchver" != 0 ]; then
	_patches="
		$_patches
		linux-$majorver.$minorver.$patchver.patch.xz::https://cdn.kernel.org/pub/linux/kernel/v$majorver.x/patch-$majorver.$minorver.$patchver.xz
	"
	pkgver="$pkgver.$patchver"
fi

_kbdir="linux-$majorver.$minorver"

source="
	https://cdn.kernel.org/pub/linux/kernel/v$majorver.x/linux-$majorver.$minorver.tar.gz
	$_patches
	$_configs
"

_kabi= _klocalver= _kconfig= _kbdmain= _kbddev= _kflavour=
_kdir_src="$srcdir/$_kbdir"

arch="noarch"
_depends_dev="
	perl
	gmp-dev
	mpc1-dev
	mpfr-dev
	elfutils-dev
	bash
	flex
	bison
	zstd
"
makedepends="
	$_depends_dev
	sed
	installkernel
	bc
	linux-headers=$pkgver-r$pkgrel
	linux-firmware-any
	openssl-dev>3
	mawk
	diffutils
	findutils
	zstd
	pahole
	python3
"

pkgdesc="Linux Kernel - Metapackage"
url="https://www.kernel.org"
license="GPL-2.0"
options="!strip"
builddir="$_kdir_src"

_carch=${CARCH} # abuild to kernel arch mapping
case "$_carch" in
	aarch64*) _carch="arm64" ;;
	arm*) _carch="arm" ;;
	mips*) _carch="mips" ;;
	ppc*) _carch="powerpc" ;;
	s390*) _carch="s390" ;;
esac

_archflavors() {
	for i in $_configs; do
		local _nocfg="${i#config-}"
		local _arch="${_nocfg#*.}"
		local _flavour="${_nocfg%.*}"
		[ "$_arch" == "$CARCH" ] && echo "$_flavour"
	done
}

_bvars() {
	  _kconfig="config-$_kflavour.$CARCH"
	_kdir_main="$srcdir/build-$_kflavour.$CARCH"
	 _kdir_dev="$srcdir/build-$_kflavour-dev.$CARCH"

	     _ksaf="$_kflavour"
	     _kabi="$pkgver-$pkgrel-$_ksaf"
	_klocalver="-$pkgrel-$_ksaf"
}

_spvars() {
	  _kflavour="$(echo $subpkgname | cut -d- -f2)"
}

for _kflavour in $(_archflavors); do

	_bvars

	subpackages="
		$subpackages
		$pkgname-$_ksaf:_pkg_kernel:$CBUILD_ARCH
		$pkgname-$_ksaf-dev:_pkg_extmod:$CBUILD_ARCH
	"
done

export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

prepare() {
	default_prepare

	for _kflavour in $(_archflavors); do

		_bvars

		for _kbuilddir in "$_kdir_main" "$_kdir_dev"; do

			mkdir -p "$_kbuilddir"
			echo "$_klocalver" > "$_kbuilddir"/localversion-alpine \
				|| return 1

			cp "$srcdir"/"$_kconfig" "$_kbuilddir"/.config

			make -C "$_kdir_src" \
				O="$_kbuilddir" \
				ARCH="$_carch" \
				olddefconfig

		done
	done
}

build() {
	unset LDFLAGS

	for _kflavour in $(_archflavors); do

		_bvars

		# Build kernel and modules
		msg "Building $_kflavour for $CARCH"
		cd "$_kdir_main"
		make \
			ARCH="$_carch" \
			CC="${CC:-gcc}" \
			KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine"

		# Build out-of-tree builder
		msg "Building $_kflavour-dev for $CARCH"
		cd "$_kdir_dev"
		make syncconfig \
			ARCH="$_carch"
		make prepare \
			ARCH="$_carch"
		make modules_prepare \
			ARCH="$_carch"
		make scripts \
			ARCH="$_carch"

	done
}

package() {
	mkdir -p "$pkgdir"
}

_pkg_kernel() {

	_spvars
	_bvars

	local _install=
	case "$CARCH" in
		arm*|aarch64) _install="zinstall dtbs_install";;
		*) _install=install;;
	esac

	local _outdir="$subpkgdir"
	mkdir -p "$_outdir"/boot "$_outdir"/lib/modules

	cd "$_kdir_main"
	# Install modules
	make modules_install \
		ARCH="$_carch" \
		INSTALL_MOD_PATH="$_outdir"

	# Install kernel
	make $_install \
		ARCH="$_carch" \
		INSTALL_PATH="$_outdir"/boot \
		INSTALL_DTBS_PATH="$_outdir/boot/dtbs-$_ksaf"

	# Remove incorrect build-time symlinks
	rm -f "$_outdir"/lib/modules/"$_kabi"/build \
		"$_outdir"/lib/modules/"$_kabi"/source
	rm -rf "$_outdir"/lib/firmware

	# Install release file
	install -D -m644 include/config/kernel.release \
		"$_outdir"/usr/share/kernel/"$_kflavour"/kernel.release
}

_pkg_extmod() {

	_spvars
	_bvars

	depends="$_depends_dev"

	local _outdir="$subpkgdir/usr/src/linux-headers-$_kabi" _builddir="$subpkgdir/lib/modules/$_kabi"
	mkdir -p "$_outdir"

	cd "$_kdir_dev"
	msg "Copying kernel out-of-tree build files"
	rm Makefile source
	cp -a . "$_outdir"

	cd "$_kdir_src"
	msg "Copying kernel out-of-tree build tree"
	cp -a scripts include "$_outdir"
	find . \
		-path './include/*' -prune -o \
		-path './scripts/*' -prune -o \
		-type f \( \
			-name 'Makefile*' -o \
			-name 'Kconfig*' -o \
			-name 'Kbuild*' -o \
			-name '*.sh' -o \
			-name '*.pl' -o \
			-name '*.lds' -o \
			-name 'Platform' \
		\) -print | \
			cpio -pdm "$_outdir"
	find ./arch \
		-path './arch/*/include/*' \
		-type f -print | \
			cpio -pdm "$_outdir"

	mkdir -p "$_builddir"
	ln -sf "/usr/src/linux-headers-$_kabi" "$_builddir"/build
}

sha512sums="
83a20d86306e91df48a65b30f7b0a608aa9e6a3bd023f2c680c749af0027d58a851775ff01bf3877098aac7375b70ec75ef37054b3094babb697d3f8a5e10035  linux-6.4.tar.gz
5850732523a33e9b71f2a969b011033708343c4a4e4a62477b00224d676bf9e5d6b82f55105e8461be8529354ae53495e06e6a568af1cdafa98ad26341bb89d5  cap_sys_nice_begone.patch
a5b87b55edce088db14924978acd88fae4150ce9a061f3ba7491e7d3b0fc0b263dcd88792a1ada01ea7cf53f707221ea29745a19bdc6e6b7888dac2e8bb26507  linux-6.4.6.patch.xz
fcff404de4f54f483a53ecd81c9f9cd3e42c837dcfda1b6bb426298f33075378b562087fc97833fe7804dcd28edfd0e5c54d9d4c244013364f9d1f9bd3b59616  config-full.x86_64
32d1da2d0d42e585294bf1e7a701229a249d51e505cced5aeb7818ce4865cb4402f5cc0b084b77630dab5e87ef19dce01bb0533e28f11f0df888befba54c1b0d  config-slim.x86_64
9e3cfc61a6627a2c8a37f33d4231b77c594fa41da14eace23f1518eb0024404e70b737a096a9ee9c96139cd3dcd7dcb0571f95ca7636296a6ef5f91af53d7053  config-rockpro64.aarch64
e258b4bbd5a83dbfd070f8011e79fccd025957265f84a69819ced6bda7055f9db55a768ec6bbdc67742e569ee8df21b8d964e137e11a91ec24638fb9cd486f13  config-bananapi_m2b.armhf
e31dd09657439310f0588fcb93215534b6aa5710522f3e06ec8d3e62d9c4bd1544b4bc9e00d2c91c7345aad77e1318e8f11ad1fee030d08c06d6b9dbebecd5ff  config-bananapi_m2z.armhf
"