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

_flavor=vanilla
pkgname=linux-${_flavor}
pkgver=4.4.38
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
	gcc-default-pie.patch

	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="${CC:-gcc}" \
		KBUILD_BUILD_VERSION="$((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"
	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
736b1cec515210eee8ec243c910a4be2  gcc-default-pie.patch
fb219ff405db2d34ab1f7d052d2d2fbb  config-vanilla.aarch64
ec4bd577f32f24143def18f66c59bb18  config-vanilla.armhf
95a504ec4ded3a581f6d2a7b43547d30  config-vanilla.x86
7bd6f86ea0e2854278e782805aa63dd7  config-vanilla.x86_64
e10e580b7aadf42ba595e35d3ff3fc69  0001-Add-dts-for-GIGABYTE-X-Gene-MP30-AR0.patch
c0233a162dfd6403c828abc86b69a062  patch-4.4.38.xz"
sha256sums="401d7c8fef594999a460d10c72c5a94e9c2e1022f16795ec51746b0d165418b2  linux-4.4.tar.xz
bc2a20a2fb42480cf09f1b240435396707fd08ae2cf9ec16be9953e922a40187  gcc-default-pie.patch
4bcde0ce497ef057006dd98915aab5797eab0a84598aad03260e3a3f4413f572  config-vanilla.aarch64
223d31ce209e61a299ac314340cb82ebbe1c18167a09dedff317f0c4bee2d6a9  config-vanilla.armhf
11e71593580afb5087614c7e0c18f7ab7e773abeb14837c2b56e8c374df73b77  config-vanilla.x86
4dde03d7f4a4155bfd5981cdb8c2ec6c87f8e01dd17971767c200fe95bc45521  config-vanilla.x86_64
b9bcbe11c017764075179fb61fb13f6d0eca2c5495402d8f4ace2331cfe0c0b4  0001-Add-dts-for-GIGABYTE-X-Gene-MP30-AR0.patch
48ec169c7adda820973b3cb9c4c91c72bb69c86f530d149065491a20ef0c4057  patch-4.4.38.xz"
sha512sums="13c8459933a8b80608e226a1398e3d1848352ace84bcfb7e6a4a33cb230bbe1ab719d4b58e067283df91ce5311be6d2d595fc8c19e2ae6ecc652499415614b3e  linux-4.4.tar.xz
e0ce6bee9bca8bc6486df3f88e38c3177983be176249146e7e1135ef322e25357b12cbe67bf8cec9bab88911ec866a100b2e623337175bdeb94ea05fa14bd714  gcc-default-pie.patch
897b4b7d4dc2b5a72f4497283d5b90336e6097e79872325255296c01498389c883f1a266f8732833ab492936fbdb1d32606b0c8e67136c7b90268352b56e8cad  config-vanilla.aarch64
2e8711861f7765cb35f70b905dc40189b1436afca11b35b3000a426d4c1afed2d9028ef71589e37340ed0c0e5e12abe45375d122712dec47d2edc0df7ea73faf  config-vanilla.armhf
7cec58789a99e6b9f929667ff5516574ec1938cf3c00d8227a4eab910efedcc54514d6a83110e57a946ab59aace33774fbccc892a85ef20cfbe51431b9988607  config-vanilla.x86
d46691e2ed91b07ea4dda57d5939fb596e46b2d14be1e13ab79e9c669893c8848a308a9508d103c9d33f9a824678597e1020f04db1a21c431b0159f1d33586fa  config-vanilla.x86_64
ebc1b89ff0985246889f68c32fb0bd326eb0f015a97b913bf8e2b92855c75809d114c57aff8f3f74d120694f1c5891d7a11ebe4aadaadd1954a947e762bf121d  0001-Add-dts-for-GIGABYTE-X-Gene-MP30-AR0.patch
38ba64e67b12d922da9d8aa278336009f6a798ac5ff127a9d9b87b872606d23b22d21bea63af21cccdc661cb24e9cbaa8d975f47d5ffae408fa9b3092cac15d4  patch-4.4.38.xz"