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

_flavor=grsec
pkgname=linux-${_flavor}
pkgver=3.12.6
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=2
pkgdesc="Linux kernel with grsecurity"
url=http://grsecurity.net
depends="mkinitfs linux-firmware"
makedepends="perl sed installkernel bash gmp-dev bc"
options="!strip"
_config=${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-3.0-3.12.6-201312221037.patch

	fix-memory-map-for-PIE-applications.patch

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

	echo "-$pkgrel" > 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 "$pkgdir"/lib/modules
	make -j1 modules_install firmware_install install \
		INSTALL_MOD_PATH="$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="cc6ee608854e0da4b64f6c1ff8b6398c  linux-3.12.tar.xz
9e75be8b127e58f1a76c0015eabb12ae  patch-3.12.6.xz
08fb432729eecd94fbd97d2b413043a1  grsecurity-3.0-3.12.6-201312221037.patch
c6a4ae7e8ca6159e1631545515805216  fix-memory-map-for-PIE-applications.patch
6dcd7940c137dadcd01a4e0f3fbc7446  kernelconfig.x86
22c5cf50df52d24d222473760a007869  kernelconfig.x86_64"
sha256sums="2e120ec7fde19fa51dc6b6cc11c81860a0775defcad5a5bf910ed9a50e845a02  linux-3.12.tar.xz
d3f0fab91fa4f25b685ae087030252feedb0169061c2f486cdf38b399e4baf7a  patch-3.12.6.xz
3db8444dda3eb2b6d41abd8f6d280303bbe2c57f3508b2537e2d3fe24aa7346a  grsecurity-3.0-3.12.6-201312221037.patch
500f3577310be52e87b9fecdc2e9c4ca43210fd97d69089f9005d484563f74c7  fix-memory-map-for-PIE-applications.patch
ab5f8d000dae45616dad9857e24961b315bc5a43f86805875c051961152a9ee3  kernelconfig.x86
46739cf496107e88e8ccc648b90b7dd0a62738fda286f2908c9aecc8ee239c8a  kernelconfig.x86_64"
sha512sums="4ba5797e0772726d05c9f2eee66dc6dc2a5033c749ef44764c805a83da739ed5d0c6443b76785e38fe1ef74cc7ade787e48144faed0cfcb6f124f05248c700ff  linux-3.12.tar.xz
dd386fa4ace7a2a63c788540fb4b76a621c2aa7ac874e2ebbf81014da255f6811584e93a4e92beffda88e33e848d8a69cdcb33cce81387b35c79ff49fc32563c  patch-3.12.6.xz
f98a05fffdffee62cdb6ceaea1326d6231e391ba771f69c24e5ea0b7f3b83a1346530c48170c0fce9cf7681a247786d3324d1034c3f10e0fcf2db61429a16705  grsecurity-3.0-3.12.6-201312221037.patch
4665c56ae1bbac311f9205d64918e84ee8b01d47d6e2396ff6b8adfb10aada7f7254531ce62e31edbb65c2a54a830f09ad05d314dfcd75d6272f4068945ad7c7  fix-memory-map-for-PIE-applications.patch
fd66d8704ef272c0d7b35237dcd297484afa39eeb8f1a820b6734e8e636c8db699116247a89dac99a59372d8dcf5125b04676d60c27eea5f65a2dbfa07aa39f8  kernelconfig.x86
3ff4b1d67975376a562624691d0ab03f4760ba8d9283719bbbfd281c49399a83feaefa70186cd1f1ca654f4e1110d9c2326f7a07bb862c59a92a7e93b9d99592  kernelconfig.x86_64"