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

_flavor=grsec
pkgname=linux-${_flavor}
pkgver=3.9.2
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=0
pkgdesc="Linux kernel with grsecurity"
url=http://grsecurity.net
depends="mkinitfs linux-firmware"
makedepends="perl installkernel bash gmp-dev bc"
options="!strip"
_config=${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-2.9.1-3.9.2-201305132026.patch

	0004-arp-flush-arp-cache-on-device-change.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 "$srcdir"/build
	export GCC_SPECS=/usr/share/gcc/hardenednopie.specs
	make CC="${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="4348c9b6b2eb3144d601e87c19d5d909  linux-3.9.tar.xz
adeb2556568f79e827e7a0ce4c483605  patch-3.9.2.xz
b94f0de970e1808e1ec6c2d97a9bcfbc  grsecurity-2.9.1-3.9.2-201305132026.patch
776adeeb5272093574f8836c5037dd7d  0004-arp-flush-arp-cache-on-device-change.patch
ae4d8b3e917cdea5330ec52048080de3  kernelconfig.x86
839de81fedd3a6294d42da70a3fb99e0  kernelconfig.x86_64"
sha256sums="60bc3e64ee5dc778de2cd7cd7640abf518a4c9d4f31b8ed624e16fad53f54541  linux-3.9.tar.xz
069126b2b70acbc27fada2bf67235238fd90ff103267b1bb392244a301321996  patch-3.9.2.xz
3a99a4111203c42fbf524e306f04784ff199322825d51c6dd4d0aaa4bbd9d930  grsecurity-2.9.1-3.9.2-201305132026.patch
e2d2d1503f53572c6a2e21da729a13a430dd01f510405ffb3a33b29208860bde  0004-arp-flush-arp-cache-on-device-change.patch
513a5f387e7453169a7f41c1ba42da3229e47edd58b5ac18da31f04905c5c0bf  kernelconfig.x86
e842cf49decc9a8f5c0f2e4b431382f521fe41db22f2c2e6a1c077b2b158b3ab  kernelconfig.x86_64"
sha512sums="77fa521f42380409f8ab400c26f7b00e225cb075ef40834bb263325cfdcc3e65aef8511ec2fc2b50bbf4f50e226fb5ab07d7a479aaf09162adbbf318325d0790  linux-3.9.tar.xz
439e32edab86f8b1bd49bc4c9325e11520d78b8182ae88aebf46a4be319c4633d6d896e2ecd3fe0363d9247f5af88a989aafca9103b8e1544262bd191440dae9  patch-3.9.2.xz
84cac525eabf87d71c99ca46442de8e7701c33052867dfa0049714b40841c921f1281081d66fdf315467a9cb70700eba2daad6bc9dd30c722305301f1b782261  grsecurity-2.9.1-3.9.2-201305132026.patch
b6fdf376009f0f0f3fa194cb11be97343e4d394cf5d3547de6cfca8ad619c5bd3f60719331fd8cfadc47f09d22be8376ba5f871b46b24887ea73fe47e233a54e  0004-arp-flush-arp-cache-on-device-change.patch
57dc79b8b08a81993e1050197886c7f91a609843ed2f919eabd6769860fb1383e87a433def8f6b544a8c6382180822b863869ef76183c4d9df421465fe13c220  kernelconfig.x86
0ce361b417821fc3795c4d8e4b3a8eeecbdc7df66261f744c55d288186f9a7d2a367f80bac2ff29c0d5c54f133cbbd74f3ec5e0147b0e7c04462627724dd3572  kernelconfig.x86_64"