# Maintainer: Natanael Copa <ncopa@alpinelinux.org>

_flavor=vanilla
pkgname=linux-${_flavor}
pkgver=4.19.53
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=0
pkgdesc="Linux vanilla kernel"
url="http://kernel.org"
depends="mkinitfs"
_depends_dev="perl gmp-dev elfutils-dev bash flex bison"
makedepends="$_depends_dev sed installkernel bc linux-headers linux-firmware openssl-dev"
options="!strip"
_config=${config:-config-vanilla.${CARCH}}
install=
source="https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz
	config-vanilla.aarch64
	config-vanilla.armhf
	config-vanilla.armv7
	config-vanilla.x86
	config-vanilla.x86_64
	config-vanilla.ppc
	config-vanilla.ppc64le
	config-vanilla.s390x

	config-virt.aarch64
	config-virt.x86
	config-virt.x86_64
	"
subpackages="$pkgname-dev:_dev:$CBUILD_ARCH"
_flavors=
for _i in $source; do
	case $_i in
	config-*.$CARCH)
		_f=${_i%.$CARCH}
		_f=${_f#config-}
		_flavors="$_flavors ${_f}"
		if [ "linux-$_f" != "$pkgname" ]; then
			subpackages="$subpackages linux-${_f}::$CBUILD_ARCH linux-${_f}-dev:_dev:$CBUILD_ARCH"
		fi
		;;
	esac
done

if [ "${pkgver%.0}" = "$pkgver" ]; then
	source="$source
	https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/patch-$pkgver.xz"
fi
arch="all"
license="GPL-2.0"

_carch=${CARCH}
case "$_carch" in
aarch64*) _carch="arm64" ;;
arm*) _carch="arm" ;;
mips*) _carch="mips" ;;
ppc*) _carch="powerpc" ;;
s390*) _carch="s390" ;;
esac

HOSTCC="${CC:-gcc}"
HOSTCC="${HOSTCC#${CROSS_COMPILE}}"

prepare() {
	local _patch_failed=
	cd "$srcdir"/linux-$_kernver
	if [ "$_kernver" != "$pkgver" ]; then
		msg "Applying patch-$pkgver.xz"
		unxz -c < "$srcdir"/patch-$pkgver.xz | patch -p1 -N
	fi

	# first apply patches in specified order
	for i in $source; do
		case $i in
		*.patch)
			msg "Applying $i..."
			if ! patch -s -p1 -N -i "$srcdir"/$i; then
				echo $i >>failed
				_patch_failed=1
			fi
			;;
		esac
	done

	if ! [ -z "$_patch_failed" ]; then
		error "The following patches failed:"
		cat failed
		return 1
	fi

	# remove localversion from patch if any
	rm -f localversion*
	oldconfig
}

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

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

build() {
	unset LDFLAGS
	for i in $_flavors; do
		cd "$srcdir"/build-$i.$CARCH
		make ARCH="$_carch" CC="${CC:-gcc}" \
			KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine"
	done
}

_package() {
	local _buildflavor="$1" _outdir="$2"
	local _abi_release=${pkgver}-${pkgrel}-${_buildflavor}

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

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

	local _install
	case "$CARCH" in
	arm*)
		local _dtbdir="$_outdir"/usr/lib/linux-${_abi_release}
		mkdir -p "$_dtbdir"
		for i in arch/arm/boot/dts/*.dtb ; do
			install -m644 "$i" "$_dtbdir"
		done

		_install=zinstall
		;;
	*)
		_install=install
		;;
	esac

	make -j1 modules_install $_install \
		ARCH="$_carch" \
		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_PATH="$_outdir"/boot \
		|| return 1

	rm -f "$_outdir"/lib/modules/${_abi_release}/build \
		"$_outdir"/lib/modules/${_abi_release}/source
	rm -rf "$_outdir"/lib/firmware

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

# main flavor installs in $pkgdir
package() {
	depends="$depends linux-firmware-any"

	_package vanilla "$pkgdir"
}

# subflavors install in $subpkgdir
virt() {
	_package virt "$subpkgdir"
}

_dev() {
	local _flavor=$(echo $subpkgname | sed -E 's/(^linux-|-dev$)//g')
	local _abi_release=${pkgver}-${pkgrel}-$_flavor
	# copy the only the parts that we really need for build 3rd party
	# kernel modules and install those as /usr/src/linux-headers,
	# simlar to what ubuntu does
	#
	# this way you dont need to install the 300-400 kernel sources to
	# build a tiny kernel module
	#
	pkgdesc="Headers and script for third party modules for $_flavor kernel"
	depends="$_depends_dev"
	local dir="$subpkgdir"/usr/src/linux-headers-${_abi_release}

	# first we import config, run prepare to set up for building
	# external modules, and create the scripts
	mkdir -p "$dir"
	cp "$srcdir"/config-$_flavor.${CARCH} "$dir"/.config
	echo "-$pkgrel-$_flavor" > "$dir"/localversion-alpine \
		|| return 1
	make -j1 -C "$srcdir"/linux-$_kernver O="$dir" ARCH="$_carch" HOSTCC="$HOSTCC" \
		silentoldconfig prepare modules_prepare scripts

	# remove the stuff that points to real sources. we want 3rd party
	# modules to believe this is the soruces
	rm "$dir"/Makefile "$dir"/source

	# copy the needed stuff from real sources
	#
	# this is taken from ubuntu kernel build script
	# http://kernel.ubuntu.com/git/ubuntu/ubuntu-zesty.git/tree/debian/rules.d/3-binary-indep.mk
	cd "$srcdir"/linux-$_kernver
	find .  -path './include/*' -prune \
		-o -path './scripts/*' -prune -o -type f \
		\( -name 'Makefile*' -o -name 'Kconfig*' -o -name 'Kbuild*' -o \
		   -name '*.sh' -o -name '*.pl' -o -name '*.lds' \) \
		-print | cpio -pdm "$dir" || return 1

	cp -a scripts include "$dir" || return 1
	find $(find arch -name include -type d -print) -type f \
		| cpio -pdm "$dir"

	install -Dm644 "$srcdir"/build-$_flavor.$CARCH/Module.symvers \
		"$dir"/Module.symvers

	mkdir -p "$subpkgdir"/lib/modules/${_abi_release}
	ln -sf /usr/src/linux-headers-${_abi_release} \
		"$subpkgdir"/lib/modules/${_abi_release}/build
}

sha512sums="ab67cc746b375a8b135e8b23e35e1d6787930d19b3c26b2679787d62951cbdbc3bb66f8ededeb9b890e5008b2459397f9018f1a6772fdef67780b06a4cb9f6f4  linux-4.19.tar.xz
110cf0fa432b2ac4dd721b5efe3084ac2624db12241f4a947b13b88e77281a92179f628c21ea94c5e3012c7290ca3229cfb5bf54c92ed6fe8e3aa3c39bc5b233  config-vanilla.aarch64
82391b4be50d36b80a1aab24b1d3783de7ec2badefd281f05684a6e8243c6e48848c6db30ca05c0fc820cb3570430d8e5f31e4dac9a3ba08c35a8f15a67fe462  config-vanilla.armhf
82391b4be50d36b80a1aab24b1d3783de7ec2badefd281f05684a6e8243c6e48848c6db30ca05c0fc820cb3570430d8e5f31e4dac9a3ba08c35a8f15a67fe462  config-vanilla.armv7
cd53837102090d1fe1f704f505dc7f7b0577bcbf52ee9b7e7c1fcbffb081066a4cd0cbfc1c54861d594460aabce1f6ab629e6e6885746e549b98bba2ed1663bc  config-vanilla.x86
8be2bd13c549057a2019c8b7f0adcd6cefb3e8d6dbbd3358e5da62664bad579c82b8169d664e8f646b55d3b751dc703b10d166e3e88cb584cce8383348530242  config-vanilla.x86_64
96651aca476c905c04d616565a2dd08066167c1d4887e2ddc86c4b7cdda44257ef633a9bcf745a91f00f88023dde8f1804c56b258e7e99232bb8bfa25d0ba4db  config-vanilla.ppc
502825e58e17eeff446bdd63d47ba610424f366f60676e0aa61f5216f531e1a836e19b3a97a9494c4c58dafa81c5379c2ab9b19bad9aa869261969dd97a1f6ee  config-vanilla.ppc64le
6a18cf89e5ccddb98dcd04936fa4f2ee512ab93b91a121648d4cc8a23b66c14aa26a4b914a828a4c32832a663e1bec2ad0d9127121117c2fe17f2dcbd4bbd04c  config-vanilla.s390x
e09d6fbb7bd2c31b792c9eb59de906ee47459b8fd88a23c8cc2f6e2ed4b6d8773b3daa2242f741e460d68e5bffac83e6af9528c1d9b307ed16bba97a41feec3e  config-virt.aarch64
eca355a7cb09310dc2302ee01d37c3f029a61368a236bf60a301b27c4339e4de11e4e7f398c9e103aa36706b27aa928c7652b5de1452118b4034aa6195dffce5  config-virt.x86
216e926f4b4d2fe77b68f293ee542b97fc55c5588a53d657df97deb0f164dcf37918d19af1590ffd165a0cd66a1379ea5f62c9c83c9ce5dacaf4c4d17537fed3  config-virt.x86_64
687573b8fdb8c856e86d9b1b3ed5e5c7fb520fac771a5615e594e702cf778802a763f3a922dd22545ccb8ce6803895b9f2f19a105544670574b7e606a5035f98  patch-4.19.53.xz"