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

_kernver=5.10
_kernpatch=52

pkgname=linux
pkgver=$_kernver.$_kernpatch
pkgrel=0
arch="noarch"
subpackages="
	$pkgname-headers:_headerspkg:$CBUILD_ARCH
"

_configs="
	config-full.aarch64
	config-full.armv7
	config-full.mips64
	config-full.ppc64le
	config-full.x86
	config-full.x86_64

	config-virt.aarch64
	config-virt.armv7
	config-virt.ppc64le
	config-virt.s390x
	config-virt.x86
	config-virt.x86_64
"

source="
	https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$pkgver.tar.xz
	$_configs
"

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

for i in $(_archflavors); do
	subpackages="
		$subpackages
		$pkgname-$i:_flavorpkg:$CBUILD_ARCH
		$pkgname-$i-dev:_devpkg:$CBUILD_ARCH
	"
done

_depends_dev="
	perl
	gmp-dev
	elfutils-dev
	bash
	flex
	bison
"

makedepends="
	$_depends_dev
	sed
	installkernel
	bc
	linux-headers
	linux-firmware-any
	openssl-dev
	diffutils
	findutils
"

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

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

prepare() {
	default_prepare
	for i in $(_archflavors); do
		local _builddir=
		local _config="config-$i.$CARCH"
		for _builddir in "$srcdir/build-$i.$CARCH" "$srcdir/build-$i-dev.$CARCH"; do
			mkdir -p "$_builddir"
			echo "-$pkgrel-$i" > "$_builddir"/localversion-alpine \
				|| return 1

			cp "$srcdir"/"$_config" "$_builddir"/.config
			make -C "$srcdir"/"linux-$pkgver" \
				O="$_builddir" \
				ARCH="$_carch" \
				listnewconfig oldconfig
		done
	done
}

build() {
	unset LDFLAGS
	for i in $(_archflavors); do
		# Build kernel and modules
		msg "Building $i for $CARCH"
		cd "$srcdir"/"build-$i.$CARCH"
		make \
			ARCH="$_carch" \
			CC="${CC:-gcc}" \
			KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine"

		# Build out-of-tree builder
		msg "Building $i=dev for $CARCH"
		cd "$srcdir"/"build-$i-dev.$CARCH"
		make syncconfig \
			O="$_outdir" \
			ARCH="$_carch"
		make prepare \
			O="$_outdir" \
			ARCH="$_carch"
		make modules_prepare \
			O="$_outdir" \
			ARCH="$_carch"
		make scripts \
			O="$_outdir" \
			ARCH="$_carch"
	done
}

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

_flavorpkg() {
	local _buildflavor="${subpkgname##$pkgname-}" _outdir="$subpkgdir"
	local _abi_release="$pkgver-$pkgrel-$_buildflavor"

	cd "$srcdir"/"build-$_buildflavor.$CARCH"

	mkdir -p "$_outdir"/boot "$_outdir"/lib/modules

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

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

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

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

	install -D -m644 include/config/kernel.release \
		"$_outdir"/usr/share/kernel/"$_buildflavor"/kernel.release
}

_devpkg() {
	depends="$_depends_dev"

	local _pkgnodev="${subpkgname%-dev}"
	local _buildflavor="${_pkgnodev##$pkgname-}"
	local _config="config-$_buildflavor.$CARCH" _abi_release="$pkgver-$pkgrel-$_buildflavor"
	local _outdir="$subpkgdir/usr/src/linux-headers-$_abi_release" _builddir="$subpkgdir/lib/modules/$_abi_release"

	mkdir -p "$_outdir"
	cd "$srcdir"/"build-$_buildflavor-dev.$CARCH"
	cp -a . "$_outdir"

	mkdir -p "$_builddir"
	ln -sf "$_outdir" "$_builddir"/build
}

_headerspkg() {
	local _outdir="$subpkgdir/usr"
	cd "$srcdir"/"linux-$pkgver"
	mkdir -p "$_outdir"

	make headers_install \
		ARCH="$_carch" \
		INSTALL_HDR_PATH="$_outdir"

	rm -f **/.install **/install.cmd

	rm -rf "$subpkgdir/usr/include/drm" # provided by libdrm-dev
}

sha512sums="
37262e3793ed433ee619e7b08c0ab64d34bbc66e29229025ada498edf45ab2c870569c0a3b17f026379c67153f277e90e1b301c95711638645bde025230201ef  linux-5.10.52.tar.xz
7ae670f2dbbdec616becce3944fe190a797a19346b4fa266deae71d4c1ccd7b0e60e400bde47d32261cb15c1b2f1579a2848adace3397d82552c52bff1421f0a  config-full.aarch64
84aaad1001be4e55c5885dcf27a4647028319123bf54195f8c1233287bec9c890dbb131920976e950136d5eacc7ff153fc9ad305cfd0ca28fd0194a263e8be4f  config-full.armv7
0caf98dec1162b1ba4e4bb4e198d0a34e59ac022532d562961cf9b22cbdb930675ff3a845bb17ddff83b91a84ad61df9d607f175c34133916e0a3cdbb4c13786  config-full.mips64
35b8424024af2fdcd93a8f2062f6b55bdfe65daf4d0a160e5b217df122dbb1727ef899636ba18d063af0e0c02a5bd57ba414466264f82c4525dd20e54d6b4b82  config-full.ppc64le
35bce78364f269e5e1fa07d36614a0204b4e180239a83d793e118c461eaf0e305e4ed3821bcfa8be128b79bf1837be5248c13c44817c8038cd80806dfb06525c  config-full.x86
6984f5fa18a0b15929b80f5480072c40cf153b96e1fbb9adf626fc9707cd2df2b702d5925fecd32362c02b28b9109c603ce520d26924105f4f9513b309949d47  config-full.x86_64
078e2b8ac688c79728c388f6cd87633b7835f19a5b3842b8ab97ef961d8b537e377e4acef4c0e65d94a686525a345586d9c31898c37a75075b5c0e5c8b6db748  config-virt.aarch64
3ce5419983ec07d3ae525fed81f26bc4b08e829d5128d6fb76d2ee707343c1ed1efbc03ca53910d406a4c6d303a01e3d2eed8af5257e134083434de0ccede5eb  config-virt.armv7
287cf039eb8a5df7844559812f9eb5cb0ce41bd47c96132e3d234d2a2b28a883cd59d7964682a530da2e482d49e2bb94601e84085cac0b631c7bf858b4f3f7c6  config-virt.ppc64le
e2657b50b1844710cc29b545e4b560b7b79827b9005c6b1ccc7e5c89de31ce0a2a169407b0bff1e3cd9a1bcaa88745c149092d45029ca13bcc2b56a2b6d77ac6  config-virt.s390x
3eba52caf34ec45f0cdaa2606643b98f46f8a19251ea3ab9d6fbe9def714674c28388be825dddeed4085eda865c63d321884ad435529b14f0fb04310d7275b31  config-virt.x86
acc7f183a6773d3de0e10c808cbfadb7b54b6f9fcf891234473adef449f87e04a486ed6ec3fae106d0ff10f0c4bc3224971319aeba03fbcaafb1590e89c5ae84  config-virt.x86_64
"