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

_flavor=vanilla
pkgname=linux-${_flavor}
pkgver=4.9.71
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=0
pkgdesc="Linux vanilla kernel"
url="http://kernel.org"
depends="mkinitfs linux-firmware"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev"
options="!strip"
_config=${config:-config-vanilla.${CARCH}}
install=
source="https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz
	0001-HID-apple-fix-Fn-key-Magic-Keyboard-on-bluetooth.patch
	config-vanilla.aarch64
	config-vanilla.armhf
	config-vanilla.x86
	config-vanilla.x86_64
	config-vanilla.ppc
	config-vanilla.ppc64le
	config-vanilla.s390x

	"
if [ "${pkgver%.0}" = "$pkgver" ]; then
	source="$source
	https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/patch-$pkgver.xz"
fi
subpackages="$pkgname-dev::$CBUILD_ARCH"
arch="all"
license="GPL2"

_abi_release=${pkgver}
_carch=${CARCH}
case "$_carch" in
aarch64*) _carch="arm64" ;;
arm*) _carch="arm" ;;
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 || return 1
	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

	mkdir -p "$srcdir"/build
	cp "$srcdir"/$_config "$srcdir"/build/.config || return 1
	make -C "$srcdir"/linux-$_kernver O="$srcdir"/build ARCH="$_carch" HOSTCC="$HOSTCC" \
		silentoldconfig
}

# this is so we can do: 'abuild menuconfig' to reconfigure kernel
menuconfig() {
	cd "$srcdir"/build || return 1
	make ARCH="$_carch" menuconfig
	cp .config "$startdir"/$_config
}

build() {
	cd "$srcdir"/build
	unset LDFLAGS
	make ARCH="$_carch" CC="${CC:-gcc}" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine" \
		|| return 1
}

package() {
	cd "$srcdir"/build

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

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

	make -j1 modules_install firmware_install $_install \
		ARCH="$_carch" \
		INSTALL_MOD_PATH="$pkgdir" \
		INSTALL_PATH="$pkgdir"/boot \
		INSTALL_DTBS_PATH="$pkgdir"/usr/lib/linux-${_abi_release} \
		|| return 1

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

	install -D include/config/kernel.release \
		"$pkgdir"/usr/share/kernel/$_flavor/kernel.release
}

dev() {
	# 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 grsec kernel"
	depends="gmp-dev bash perl"
	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"/$_config "$dir"/.config
	make -j1 -C "$srcdir"/linux-$_kernver O="$dir" ARCH="$_carch" HOSTCC="$HOSTCC" \
		silentoldconfig prepare modules_prepare scripts

	# needed for 3rd party modules
	# https://bugzilla.kernel.org/show_bug.cgi?id=11143
	case "$CARCH" in
	ppc*) (cd "$dir" && make arch/powerpc/lib/crtsavres.o);;
	esac

	# 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"
	find $(find arch -name include -type d -print) -type f \
		| cpio -pdm "$dir"

	install -Dm644 "$srcdir"/build/Module.symvers \
		"$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="bf67ff812cc3cb7e5059e82cc5db0d9a7c5637f7ed9a42e4730c715bf7047c81ed3a571225f92a33ef0b6d65f35595bc32d773356646df2627da55e9bc7f1f1a  linux-4.9.tar.xz
5373728be2b507c3db5e042e1d768740df7965078868afdc46418b1adc4cae3d8f9f1aedb59975a0f2acf8754340499354fcf97c503397a5d9886ccc9689b782  0001-HID-apple-fix-Fn-key-Magic-Keyboard-on-bluetooth.patch
d552c5ab3b128cb1b4185aaa3ed27cd92070c2ba5f414747730c1915da432d1f930f81543737b902771967b02da8b41374d8b39518e5443aeaadeaa28153ae36  config-vanilla.aarch64
8db3d9029dffc972d881ffdccbb6afcc02cdb5ccf6a571634e1c1b72552617903ee3e1c87b8971ef1c7143c0ddfcb8e1f21b45c68afeef88d5ff36bb768c8c96  config-vanilla.armhf
6e1d79ebd2113e02881aec39eb4d243761d78be9c736b0ce5ddf1721e65d411a17c866c9f5f9a253e46017d6e7c0b93b7220233780e46e18e29de705f2e543f7  config-vanilla.x86
0a283ad25b8e0242e9904c8737d2fef9919faf8f4aa9bb3ffc65a9e144ba5d2e37dddf17b68cd9d717d73993b340634361b9a1354bb01207f2f668c73addc751  config-vanilla.x86_64
ee565e219530bcfaf5cade2622432cfb83743bdbbfc388781901461f19ca553b7fdee3c81ce6b34225ef78a209eb60088630284fcbb0430947aad77a5d8a0865  config-vanilla.ppc
faf5216f916946025041c5b8ffacce2586c88c7d796c17fb9762a8a58986dce7e923a7eb7a413cbd830afef022b18c40b25f4dcd4c9c81253c9aa3e98001b2b0  config-vanilla.ppc64le
26969c1ed93cb88a8b12330a2984954d6c20ef973ef619cf92c0543ab075f4e3342c7d6275ccecd475c5b6129ccfdd6054b41f504bd82e14eb9cefbd74aa1b90  config-vanilla.s390x
99f089156ceea6367ee21390d8faaa02e81662430ec284c17fa1b3e91ba57d55c0df511614c6dda2443902eecad8a258e197327f4b9bd678487b8904f1553a31  patch-4.9.71.xz"