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

_flavor=vanilla
pkgname=linux-${_flavor}
pkgver=3.14.18
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=0
pkgdesc="Linux kernel with grsecurity"
url=http://grsecurity.net
depends="mkinitfs linux-firmware"
makedepends="perl sed installkernel bash gmp-dev bc"
options="!strip"
_config=${config:-kernelconfig.${CARCH}}
install=
source="http://ftp.kernel.org/pub/linux/kernel/v3.x/linux-$_kernver.tar.xz
	fs-binfmt_elf-fix-memory-map-for-PIE-applications.patch

	kernelconfig.armhf
	kernelconfig.x86
	kernelconfig.x86_64
	"
if [ "${pkgver%.0}" = "$pkgver" ]; then
	source="$source
	http://ftp.kernel.org/pub/linux/kernel/v3.x/patch-$pkgver.xz"
fi
subpackages="$pkgname-dev"
arch="all"
license="GPL-2"

_abi_release=${pkgver}

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="$srcdir"/build HOSTCC="${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

	local _install
	case "$CARCH" in
	arm*)
		local _dtbdir="$pkgdir"/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 firmware_install $_install \
		INSTALL_MOD_PATH="$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"
	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
59d1fabcccea6a8a3fcf59d610205a6e  fs-binfmt_elf-fix-memory-map-for-PIE-applications.patch
d1c82061be3bd2025ad6b3ce1ce709ab  kernelconfig.armhf
a4b4693bc22560d8490a387c5e37620f  kernelconfig.x86
428c840b406b7cec77524ebb0e9f4e71  kernelconfig.x86_64
f00741b35127573c3cf085fc43f6e3f0  patch-3.14.18.xz"
sha256sums="61558aa490855f42b6340d1a1596be47454909629327c49a5e4e10268065dffa  linux-3.14.tar.xz
e1377ef692929a37f1e638038b10e06a98502f28efc461e1948dcd67df1e7619  fs-binfmt_elf-fix-memory-map-for-PIE-applications.patch
2a0fa05d05e6632413dfc2445fdaa3b910d60a261ce91a07bd870fb00b448634  kernelconfig.armhf
353983b658b675964cd5f5285a07b5f7fe3bf3aef6ec0c962f9063edbb82e57b  kernelconfig.x86
795e0dfb98ae64facf39d5346d009a3a13179cc6c76147d413bd8899f8d53233  kernelconfig.x86_64
3723d8d91e1bba0ed57a4951e8089ebfaa21ac186c3b729b4d2bad2da3eaed9f  patch-3.14.18.xz"
sha512sums="5730d83a7a81134c1e77c0bf89e42dee4f8251ad56c1ac2be20c59e26fdfaa7bea55f277e7af156b637f22e1584914a46089af85039177cb43485089c74ac26e  linux-3.14.tar.xz
e8b5a96ddcf55ac9df7de506728a5308f9156086410edf6d354d7c69f6fb450222b25eb062e397889eeb9e5653c3f5110b0603003cca5d6706171b5559ddcd97  fs-binfmt_elf-fix-memory-map-for-PIE-applications.patch
3a06eac4c5ccccc2201b8e1f437bd46f170c78a88db22a5a025a73b74f77873c3546b2e4e043efbe2673954bea06739d1d6d720cf20838a71de63d7cc41dbb1b  kernelconfig.armhf
2ef8b5b32bcf250249d329fa8a9762eeb03b5c248ea6ac66b66953e06e1d9cbe29eeca2b6d541d18f2e2e93cd68a3e42d8d6e08af676096396b9139425437b38  kernelconfig.x86
37c5dca79ad1179e9b3236f7f1419b929da9bf5528c2e8b9bdc6b2989326ed7e2f7b4535548629470aad6ff363047e8448b5f1e83aee845cc80b18aa9c76909c  kernelconfig.x86_64
c7c5b281986819cb69592cc4c2b7c7d79f34aa86f21db1dd64b795dda79b5f9df95626dada5c8e0613c58d8d7979f37baf0a87cd458f340018ce61b42e4eb6c5  patch-3.14.18.xz"