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

_flavor=rpi
pkgname=linux-${_flavor}
pkgver=3.14.35
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=0
pkgdesc="Linux kernel with Raspberry Pi patches"
url=https://github.com/raspberrypi/linux
depends="mkinitfs linux-firmware"
makedepends="perl installkernel bash gmp-dev bc"
options="!strip"
_config=${config:-kernelconfig.${CARCH}}
install=
source="http://ftp.kernel.org/pub/linux/kernel/v3.x/linux-$_kernver.tar.xz
	http://ftp.kernel.org/pub/linux/kernel/v3.x/patch-$pkgver.xz
	http://dev.alpinelinux.org/~tteras/linux-3.14.y-rpi-20140923.patch
	aslr-pie.patch
	fix-bcm-fb.patch
	kernelconfig.armhf
	"
subpackages="$pkgname-dev"
arch="armhf"
license="GPL-2"

_abi_release=${pkgver}-${pkgrel}-${_flavor}

prepare() {
	local _patch_failed=
	cd "$srcdir"/linux-$_kernver
	if [ "${pkgver%.0}" = "$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

	rm -f localversion*
	echo "-$pkgrel-$_flavor" > localversion-alpine

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

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

build() {
	cd "$srcdir"/build
	export GCC_SPECS=hardenednopie.specs
	make CC="${CC:-gcc}" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine" \
		|| return 1
}

package() {
	cd "$srcdir"/build

	mkdir -p "$pkgdir"/boot "$pkgdir"/lib/modules
	make -j1 modules_install firmware_install zinstall \
		INSTALL_MOD_PATH="$pkgdir" \
		INSTALL_PATH="$pkgdir"/boot \
		|| 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="$dir" HOSTCC="${CC:-gcc}" \
		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="b621207b3f6ecbb67db18b13258f8ea8  linux-3.14.tar.xz
7db70508b7cb888650f8bc14bca04a03  patch-3.14.35.xz
e0ba3d497c3476973e9702af8974145a  linux-3.14.y-rpi-20140923.patch
f901100a661ec62aac12000872d0276c  aslr-pie.patch
2ebe642a14c431ac7f139e1803f66d8c  fix-bcm-fb.patch
f4a7b1481ae53c5da4d071be1c880cea  kernelconfig.armhf"
sha256sums="61558aa490855f42b6340d1a1596be47454909629327c49a5e4e10268065dffa  linux-3.14.tar.xz
372a13e28ec4dc16c38e9bf2a01919960844d5c1fec66e7fe49918484c624094  patch-3.14.35.xz
20af8de40d5d59f0ba8e4c0ecd69070854e3fc2c42dce52aa4b9897d2f79b86d  linux-3.14.y-rpi-20140923.patch
07e9b089c0d5d57e91256ff6e8fe373519c8bd4ae4cba4eb4a2edad3e2cc9a8e  aslr-pie.patch
7cfc53e138764ed1e17b2b6c2eb2eaae51efc741697dbdcf2a64e7a1a089123b  fix-bcm-fb.patch
28ead5cbc2475e5ba76c841fdc24ad5258665ff1e5a98dfee8e147c6b7303659  kernelconfig.armhf"
sha512sums="5730d83a7a81134c1e77c0bf89e42dee4f8251ad56c1ac2be20c59e26fdfaa7bea55f277e7af156b637f22e1584914a46089af85039177cb43485089c74ac26e  linux-3.14.tar.xz
f698636b1c06e2694a1e991c2563f43991f75fc3a4c0933b7a2b1e1e0d847df6868c7e7aa4661ed1242b9120d3fa5214e06920feeadec098652a9b8bf7b97be8  patch-3.14.35.xz
effa64ce5592f62d3cff5b13936fb8997ae320dd7bb975919d72db725a744f9c760197e405883be09b3aa2251ef10b67e5869294692cf8518a6aa3393fb42634  linux-3.14.y-rpi-20140923.patch
35055eea7fce660a200cf6f56490a88f1601b4ea95d2364191ad0d890633e8811f2753b5816dad9640384a764b147a4a80b95f39e3bd7a66a15fd5b3ec0c794a  aslr-pie.patch
85529aef8e95a29c928067e03fb3c794f3ec31dce2bd27d69114b9991ca4a3319f48912dc535b335aa4cffb8e0a8c61af18d6e52b4095bdf09ebcf996e91d018  fix-bcm-fb.patch
847b0daeba852e3d280ad4deb51b95cef375f04ab1033a1bc9a95febba7bf3a893f8752cf7b9286d37030ee8bf0baf3852343a428739934024a9b48505e2c4a0  kernelconfig.armhf"