# Maintainer: Leonardo Arena <rnalrd@alpinelinux.org>
# Maintainer: Bartłomiej Piotrowski <bpiotrowski@alpinelinux.org>

_flavor=virt-grsec
pkgname=linux-${_flavor}
pkgver=3.12.15
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=0
pkgdesc="Linux kernel for virtual guests with grsecurity"
url="http://grsecurity.net"
depends="mkinitfs linux-firmware"
makedepends="perl sed installkernel bash gmp-dev bc"
options="!strip"
_config=${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-3.0-3.12.8-201401191015.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

	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 "$pkgdir"/lib/modules
	make -j1 modules_install firmware_install install \
		INSTALL_MOD_PATH="$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
5c7e75bb6727bc229df1e8233e4fa472  patch-3.12.15.xz
a7dd09d05b98cca3b7c00098698bdd38  grsecurity-3.0-3.12.8-201401191015.patch
c6a4ae7e8ca6159e1631545515805216  fix-memory-map-for-PIE-applications.patch
cc0bc34dd6d4f4396fa70ceaa5aa4a1a  kernelconfig.x86
93a67bcefa885e0089247694c3e1fa25  kernelconfig.x86_64"
sha256sums="2e120ec7fde19fa51dc6b6cc11c81860a0775defcad5a5bf910ed9a50e845a02  linux-3.12.tar.xz
6fa9dfea3d3bb41464652f07fd036886336be3fbb73e2c06baabd1005af1d2cf  patch-3.12.15.xz
8ec870556270bb0041b1b7fcc4d86328c62023a288b8e914b8721c94956ac737  grsecurity-3.0-3.12.8-201401191015.patch
500f3577310be52e87b9fecdc2e9c4ca43210fd97d69089f9005d484563f74c7  fix-memory-map-for-PIE-applications.patch
bb7418bfdfbe45476331412b17a06abb08f8a0f44fe8ff978fd3413e8671ae66  kernelconfig.x86
4a11a2edd0dc69687f96f6c80140537b8ba74684244af59a1ffe74cd69712c6c  kernelconfig.x86_64"
sha512sums="4ba5797e0772726d05c9f2eee66dc6dc2a5033c749ef44764c805a83da739ed5d0c6443b76785e38fe1ef74cc7ade787e48144faed0cfcb6f124f05248c700ff  linux-3.12.tar.xz
34fd4338351d2107709b4cc2d16bed248e27759485cc4ec859c1cde97891a4032cde706ac2c64a45d90fc9268bc317c05cd88919910afb00cb58eb6aabe42443  patch-3.12.15.xz
d8d9ead63a728385fff54597cd25d0856d9f1e964d871cf75ed9563beb358ea8f6e87d81ed16432c02772fa3d8e1caf45b15e0cce4ec4c07e73e0ef531f28016  grsecurity-3.0-3.12.8-201401191015.patch
4665c56ae1bbac311f9205d64918e84ee8b01d47d6e2396ff6b8adfb10aada7f7254531ce62e31edbb65c2a54a830f09ad05d314dfcd75d6272f4068945ad7c7  fix-memory-map-for-PIE-applications.patch
b2245e3eeb020651eb36289d658b32a0ace45e00c392113e8589dbc31f5bd602fb3284b915b4924c235c7886f5e773ad731ddb392ca9e7b10528e0344bdafaef  kernelconfig.x86
203ef17038ebdb92dbdd6547875816012442f6d4c3d5ea43d9f4898b4c074feda85c485c3bf2aa1b6de127985292aaeef3596e66f06282c7853f9ff7db0a5df4  kernelconfig.x86_64"