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

_flavor=grsec
pkgname=linux-${_flavor}
pkgver=3.14.28
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
	http://ftp.kernel.org/pub/linux/kernel/v3.x/patch-$pkgver.xz
	grsecurity-3.0-3.14.28-201501120819.patch

	fix-memory-map-for-PIE-applications.patch
	imx6q-no-unclocked-sleep.patch
	gre-fix-the-inner-mac-header-in-nbma-gre-tunnels-xmit-path.patch

	kernelconfig.x86
	kernelconfig.x86_64
	kernelconfig.armhf
	"
subpackages="$pkgname-dev"
arch="x86 x86_64 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

	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 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
502a4ee34af04e9b9e375e254f7b9a8f  patch-3.14.28.xz
14277edb3cc6b593f80bf0e62ba8ec70  grsecurity-3.0-3.14.28-201501120819.patch
c6a4ae7e8ca6159e1631545515805216  fix-memory-map-for-PIE-applications.patch
1a307fc1d63231bf01d22493a4f14378  imx6q-no-unclocked-sleep.patch
59a78a67677e25540028414bb5eb6330  gre-fix-the-inner-mac-header-in-nbma-gre-tunnels-xmit-path.patch
870b91f0eb07294ba453ac61b052c0b6  kernelconfig.x86
38b50cd1a7670f886c5e9fe9f1f91496  kernelconfig.x86_64
6709c83fbbd38d40f31d39f0022d4ce9  kernelconfig.armhf"
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e3c79a30ac959c84c329be5461da88a5c79c6463da30d376c27bb103aee79b51  patch-3.14.28.xz
487f4b17658ab037586e9106bca355ad35195d1e78e73ceb2cc7feb55c54ef46  grsecurity-3.0-3.14.28-201501120819.patch
500f3577310be52e87b9fecdc2e9c4ca43210fd97d69089f9005d484563f74c7  fix-memory-map-for-PIE-applications.patch
21179fbb22a5b74af0a609350ae1a170e232908572b201d02e791d2ce0a685d3  imx6q-no-unclocked-sleep.patch
f04d0f6610398f3657ddb2e6926113c43ec331ae256704bca4de11f432881ec5  gre-fix-the-inner-mac-header-in-nbma-gre-tunnels-xmit-path.patch
bf953a65ba047b5316509da5bc7a6dbcee12767e343d26e8360369d27bfdbe78  kernelconfig.x86
d555a01f2b464e20cfa71c67ea6d571f80c707c5a3fea33879de09b085e2d7b6  kernelconfig.x86_64
01a6c90cf0643f8727d120aede2267ca7303c4ebe548c5d19222d4387ceb98cc  kernelconfig.armhf"
sha512sums="5730d83a7a81134c1e77c0bf89e42dee4f8251ad56c1ac2be20c59e26fdfaa7bea55f277e7af156b637f22e1584914a46089af85039177cb43485089c74ac26e  linux-3.14.tar.xz
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633acca6d98d8a33ee34fcc5c4e51dffe30a682d39ad55bddcee196c15773dc410a59fa70691a73a638cfff7c74379b178952c69e30606435cc6dfae21775ef7  grsecurity-3.0-3.14.28-201501120819.patch
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ddc32533bd519db5298895eb2da5eb95390999bd3f6d27b5eee38551387df4a43f537235d6a9be859ee1f433420f3afbf01e2c1e7ca0175b27460598c5c385f9  gre-fix-the-inner-mac-header-in-nbma-gre-tunnels-xmit-path.patch
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