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

   pkgname=linux
     _kver=5.15
   _kpatch=12
    pkgver=$_kver.$_kpatch
    pkgrel=2

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

	config-rockpro64.aarch64
"

source="
	https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$pkgver.tar.xz
	$_configs
	rtw89-add-Realtek-802.11ax-driver.patch
"

_kabi= _klocalver= _kconfig= _kbdmain= _kbddev= _kflavor=
_kdir_src="$srcdir/linux-$pkgver"

arch="noarch"
_depends_dev="
	perl
	gmp-dev
	elfutils-dev
	bash
	flex
	bison
"
makedepends="
	$_depends_dev
	sed
	linux-headers
	installkernel
	bc
	openssl-dev
	diffutils
	findutils
"

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-$_kflavor.$CARCH"
	_kdir_main="$srcdir/build-$_kflavor.$CARCH"
	 _kdir_dev="$srcdir/build-$_kflavor-dev.$CARCH"

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

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

for _kflavor 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 _kflavor 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 _kflavor in $(_archflavors); do

		_bvars

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

		# Build out-of-tree builder
		msg "Building $_kflavor-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 \
		"$_outdir"/usr/share/kernel/"$_kflavor"/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="
8b79f30c26a865578d771b0c1a8273ecbf19135e4844210cb31c81784311601b8f7adfe1b3a9bc75c6bed99dcad9a5ff5e1976494b64f0de45be3a6570336890  linux-5.15.12.tar.xz
0db424b64b50a1ffda7a8591526eb3d4d77b97b74aeee49810ef05730f95622573775026073ce57e43b4389c5c2ba075be42c49b5c3fd5e745d8c6b948a77b62  config-full.x86_64
acc7f183a6773d3de0e10c808cbfadb7b54b6f9fcf891234473adef449f87e04a486ed6ec3fae106d0ff10f0c4bc3224971319aeba03fbcaafb1590e89c5ae84  config-slim.x86_64
ad69e8a63a9aae01191e751520dc50ed43397770b90b154e9b4fc5129765f29d93d36f219ee62dda9f3826fdc0e2b312aaaac2edc998c1a073efb1200ada1338  config-rockpro64.aarch64
8c97361cf0b8cf8b4630198b69e318413bedd63c34ec8cc62604f4198cc66cdffb029ed9f719fa946e97aacece327cf72b1dc5bbf3c6b4c0391bf51be96135e2  rtw89-add-Realtek-802.11ax-driver.patch
"