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

_flavor=vanilla
pkgname=linux-${_flavor}
pkgver=4.4.18
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=0
pkgdesc="Linux vanilla kernel"
url="http://kernel.org"
depends="mkinitfs linux-firmware"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers"
options="!strip"
_config=${config:-config-vanilla.${CARCH}}
install=
source="http://ftp.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz

	config-vanilla.aarch64
	config-vanilla.armhf
	config-vanilla.x86
	config-vanilla.x86_64

	0001-Add-dts-for-GIGABYTE-X-Gene-MP30-AR0.patch
	"
if [ "${pkgver%.0}" = "$pkgver" ]; then
	source="$source
	http://ftp.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/patch-$pkgver.xz"
fi
subpackages="$pkgname-dev"
arch="all"
license="GPL2"

_abi_release=${pkgver}
_carch=${CARCH}
case "$_carch" in
aarch64*) _carch="arm64" ;;
arm*) _carch="arm" ;;
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 "$srcdir"/build
	make ARCH="$_carch" CC="${CC:-gcc}" \
		KCFLAGS="-fno-pie" \
		KBUILD_BUILD_VERSION="$((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" \
		KCFLAGS="-fno-pie" \
		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"
	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 

	# remove the stuff that poits 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?p=ubuntu/ubuntu-jaunty.git;a=blob;f=debian/rules.d/3-binary-indep.mk;hb=HEAD
	cd "$srcdir"/linux-$_kernver
	find . -path './include/*' -prune -o -path './scripts/*' -prune \
		-o -type f \( -name 'Makefile*' -o -name 'Kconfig*' \
		-o -name 'Kbuild*' -o -name '*.sh' -o -name '*.pl' \
		-o -name '*.lds' \) | cpio -pdm "$dir"
	cp -a drivers/media/dvb/dvb-core/*.h "$dir"/drivers/media/dvb/dvb-core
	cp -a drivers/media/video/*.h "$dir"/drivers/media/video
	cp -a drivers/media/dvb/frontends/*.h "$dir"/drivers/media/dvb/frontends
	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
}

md5sums="9a78fa2eb6c68ca5a40ed5af08142599  linux-4.4.tar.xz
a6dfa9d305a9625396f09d6ec35eede8  config-vanilla.aarch64
6f923d5029129429bceae658a832ff4c  config-vanilla.armhf
60c2b6b5d9c671470fff8266555ad3d8  config-vanilla.x86
1b7e060937dd969d42480e48b516b721  config-vanilla.x86_64
e10e580b7aadf42ba595e35d3ff3fc69  0001-Add-dts-for-GIGABYTE-X-Gene-MP30-AR0.patch
063e962d64cc080f71ac279e300c7338  patch-4.4.18.xz"
sha256sums="401d7c8fef594999a460d10c72c5a94e9c2e1022f16795ec51746b0d165418b2  linux-4.4.tar.xz
dea3531c6aac5419789d8d5c9f018faf65e7b87ae0c11726b8827edd381bbac6  config-vanilla.aarch64
6a923534767f24e0adc515e4c29ee7b95498be4fc0c9ba61142669bacd8d7cb0  config-vanilla.armhf
e7df86b65f7064eca60b8ac5a21260161a4eae8a48b6dfe7f057751f119c492a  config-vanilla.x86
70d4f132f8fd55df918b7f6a1348b9901644117c48acb4cff6731e461ef538a9  config-vanilla.x86_64
b9bcbe11c017764075179fb61fb13f6d0eca2c5495402d8f4ace2331cfe0c0b4  0001-Add-dts-for-GIGABYTE-X-Gene-MP30-AR0.patch
e9b76a27653a4a16d4e641e8402c325b051666af5da0def60f26d9cda9b8f60d  patch-4.4.18.xz"
sha512sums="13c8459933a8b80608e226a1398e3d1848352ace84bcfb7e6a4a33cb230bbe1ab719d4b58e067283df91ce5311be6d2d595fc8c19e2ae6ecc652499415614b3e  linux-4.4.tar.xz
e54a65b033615e31922e00605b7e393a92cde51984ebd4dffd5fbf5dad697ce9b79e8c2983ea23f307b3fd57ca6e56f18ae5c7377d780039b03dab3e9bc82671  config-vanilla.aarch64
b31f3708f177f4841e89e7eb01a4e93bd977c79f3255522c01c1664d36fd680dfaf31fb407d6e00b0a4dcee31f8e7daba5119b51377a3a6056f37aefb9067da2  config-vanilla.armhf
84f1779ab4ee7bbdcddca2c713947af0768d2b29e53f607c728b7c2f7de64bf5d9b5e1556e0d2a8479ff7a15a8532e38fd949098fd478bcbf571707d0aef5c3c  config-vanilla.x86
cacc61470c25934fff51dcdf2f6188aeb833eb881399d6b7f97548e399095c3279704655dc090ce3a56c089e8b0fb101e1469500f79b4fd28b4335658435b901  config-vanilla.x86_64
ebc1b89ff0985246889f68c32fb0bd326eb0f015a97b913bf8e2b92855c75809d114c57aff8f3f74d120694f1c5891d7a11ebe4aadaadd1954a947e762bf121d  0001-Add-dts-for-GIGABYTE-X-Gene-MP30-AR0.patch
981f01c9e70edb782fa1f97066341bf179264b8c8b08a268573f78335db895e362a6031757cfca3184f07068f346cf0ea33b3292b6d2c19da255b0fdd6cdfffb  patch-4.4.18.xz"