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

_flavor=virt-grsec
pkgname=linux-${_flavor}
pkgver=3.14.5
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-3.0-3.14.5-201406021708.patch
	fix-memory-map-for-PIE-applications.patch

	kernelconfig.x86
	kernelconfig.x86_64
	"
subpackages="$pkgname-dev"
arch="x86 x86_64"
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="b621207b3f6ecbb67db18b13258f8ea8  linux-3.14.tar.xz
a56bf05cb9033097198f9269bbcff130  patch-3.14.5.xz
e3879ccdca92dbec4e42109a9f5552bb  grsecurity-3.0-3.14.5-201406021708.patch
c6a4ae7e8ca6159e1631545515805216  fix-memory-map-for-PIE-applications.patch
0593091e003403e5c52c7b173f8866f6  kernelconfig.x86
d5427d0c3bc034aed0614ce29e66876f  kernelconfig.x86_64"
sha256sums="61558aa490855f42b6340d1a1596be47454909629327c49a5e4e10268065dffa  linux-3.14.tar.xz
ecc00856830c05736b3f99609bc6d80353c29d2db9b0dffb91eb2d169808cac4  patch-3.14.5.xz
8695054d1a1bd02acd2a08b1268eb65349f6877b1be1a00251dcbc5dd95a5a00  grsecurity-3.0-3.14.5-201406021708.patch
500f3577310be52e87b9fecdc2e9c4ca43210fd97d69089f9005d484563f74c7  fix-memory-map-for-PIE-applications.patch
00f0bdb92fc2878625716b9e6569b597908639e1784ec283d896d87f7a9c8d65  kernelconfig.x86
e7832d2bcb090a177640c75ac6a0c259d013e7e3a61cd173b729457d18533132  kernelconfig.x86_64"
sha512sums="5730d83a7a81134c1e77c0bf89e42dee4f8251ad56c1ac2be20c59e26fdfaa7bea55f277e7af156b637f22e1584914a46089af85039177cb43485089c74ac26e  linux-3.14.tar.xz
068d139063c94f0e3fd4c24217705628b20f996f6e4cce88366c060150a123381babcfc05c953c58023deff0f7b28b4129b8d381b20dd4e3ac80ce4dbc4ec1e3  patch-3.14.5.xz
86aa2f621e4fe52eaf498236289b66532f7a8bc087e9100ec168861cead44b7a4329ad609314b6b0bcbf114adf7378ae4eb38b37fc7d8e414473b7de1b84bd2f  grsecurity-3.0-3.14.5-201406021708.patch
4665c56ae1bbac311f9205d64918e84ee8b01d47d6e2396ff6b8adfb10aada7f7254531ce62e31edbb65c2a54a830f09ad05d314dfcd75d6272f4068945ad7c7  fix-memory-map-for-PIE-applications.patch
37661c86ee78bae4f71c325437bf5c1e4d3515988f636289ea120caad8925e959a5f7891d3909e8c721be851eb38810b1db5e19ee5db2046597f26f64d34ef23  kernelconfig.x86
4bfeb5fe218e6adf6a323166607ce76e235645da53be31a8678f20d00b764e918a0be0bbad4e2b34281fb4aa2a208ccdb208cc1a7ed5a1210e50caec67735bf5  kernelconfig.x86_64"