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

_mainflavor=grsec
pkgname=linux-$_mainflavor
pkgver=4.4.13
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=0
pkgdesc="Linux kernel with grsecurity"
url=http://grsecurity.net
depends="mkinitfs"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers mpfr-dev
	mpc1-dev"
options="!strip"
install=
source="http://ftp.kernel.org/pub/linux/kernel/v4.x/linux-$_kernver.tar.xz
	http://ftp.kernel.org/pub/linux/kernel/v4.x/patch-$pkgver.xz
	http://dev.alpinelinux.org/~ncopa/grsec/grsecurity-3.1-$pkgver-201604252206-alpine.patch

	fix-spi-nor-namespace-clash.patch
	imx6q-no-unclocked-sleep.patch

	config-grsec.x86
	config-grsec.x86_64
	config-grsec.armhf

	config-virtgrsec.x86
	config-virtgrsec.x86_64
	"
subpackages="$pkgname-dev linux-virtgrsec-dev"
_flavors=
for _i in $source; do
	case $_i in
	config-*.$CARCH)
		_f=${_i%.$CARCH}
		_f=${_f#config-}
		_flavors="$_flavors ${_f}"
		if [ "linux-$_f" != "$pkgname" ]; then
			subpackages="$subpackages linux-${_f}"
		fi
		;;
	esac
done

arch="x86 x86_64 armhf"
license="GPL2"

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 $source; do
		local file=${i%::*}
		case $file in
		*.patch)
			msg "Applying $file..."
			if ! patch -s -p1 -N -i "$srcdir"/${file##*/}; then
				echo $file >>failed
				_patch_failed=1
			fi
			;;
		esac
	done

	if ! [ -z "$_patch_failed" ]; then
		error "The following patches failed:"
		cat failed
		return 1
	fi

	# remove localversion from patch if any
	rm -f localversion*

	for i in $_flavors; do
		local _config=config-$i.${CARCH}
		local _builddir="$srcdir"/build-$i
		mkdir -p "$_builddir"
		echo "-$pkgrel-$i" > "$srcdir"/build-$i/localversion-alpine \
			|| return 1

		cp "$srcdir"/$_config "$_builddir"/.config || return 1
		make -C "$srcdir"/linux-$_kernver \
			O="$_builddir" \
			HOSTCC="${CC:-gcc}" \
			silentoldconfig || return 1
	done
}

build() {
	export GCC_SPECS=hardenednopie.specs
	for i in $_flavors; do
		cd "$srcdir"/build-$i
		make CC="${CC:-gcc}" \
			KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine" \
			|| return 1
	done
}

_package() {
	local _buildflavor="$1" _outdir="$2"
	local _abi_release=${pkgver}-${pkgrel}-${_buildflavor}

	cd "$srcdir"/build-$_buildflavor || return 1

	mkdir -p "$_outdir"/boot "$_outdir"/lib/modules

	local _install
	case "$CARCH" in
	arm*)
		local _dtbdir="$_outdir"/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 $_install \
		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_PATH="$_outdir"/boot \
		|| return 1

	rm -f "$_outdir"/lib/modules/${_abi_release}/build \
		"$_outdir"/lib/modules/${_abi_release}/source
	rm -rf "$_outdir"/lib/firmware

	install -D include/config/kernel.release \
		"$_outdir"/usr/share/kernel/$_buildflavor/kernel.release
}

# main flavor installs in $pkgdir
package() {
	depends="$depends linux-firmware"
	_package grsec "$pkgdir"
}

# subflavors install in $subpkgdir
virtgrsec() {
	_package virtgrsec "$subpkgdir"
}

_dev() {
	local _flavor="$1"
	local _abi_release=${pkgver}-${pkgrel}-$_flavor
	# 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 $_flavor kernel"
	depends="gmp-dev bash"
	local dir="$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-$_flavor.${CARCH} "$dir"/.config
	echo "-$pkgrel-$_flavor" > "$dir"/localversion-alpine \
		|| return 1
	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 "$srcdir"/build-$_flavor/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
}

dev() {
	_dev grsec
}

virtgrsec_dev() {
	_dev virtgrsec
}

md5sums="9a78fa2eb6c68ca5a40ed5af08142599  linux-4.4.tar.xz
0985afde06951614f594120d7c8ffad7  patch-4.4.13.xz
9a9fda3a426539cb6ee5061ad5762e90  grsecurity-3.1-4.4.13-201604252206-alpine.patch
c32f1d7517a095a2645fc1c7dec5db8f  fix-spi-nor-namespace-clash.patch
b11c29ee88f7f537973191036d48bee7  imx6q-no-unclocked-sleep.patch
0f3836729769884621131f0620b65482  config-grsec.x86
e7ce299970a212c6482f1d7f433ee1dc  config-grsec.x86_64
bd9cf4d55fef7f6f716bcd3878533a41  config-grsec.armhf
effe99ef985cebae1208c87530aace1a  config-virtgrsec.x86
e6b011c803981b0105b2882254a9b8ae  config-virtgrsec.x86_64"
sha256sums="401d7c8fef594999a460d10c72c5a94e9c2e1022f16795ec51746b0d165418b2  linux-4.4.tar.xz
be42ec5fecf89c6f730f4d7af7db1dac56ac8f6451aed9246a500302ad8f3899  patch-4.4.13.xz
38634cef26c307a17531628f668a4610df197994e15cbc5b5585b4e4a2051290  grsecurity-3.1-4.4.13-201604252206-alpine.patch
b8ce28c61663dbd92f7e1c862c042c88c4d0459ce15f6e6ea121e20705b66212  fix-spi-nor-namespace-clash.patch
7e8a954750139a421a76e414e19a3b57645c9ec70e6c14a6b7708a3fa0cfd5e4  imx6q-no-unclocked-sleep.patch
b4c077e6de0fa122530422b04d7d4584da1765b9ae05d4b844bf0f3b0fafb148  config-grsec.x86
69ecc65ffa5b6ae82bfceb7549f19668e813f69aca7e295bf0d871c36d23f628  config-grsec.x86_64
5722cf941ae841f28306f785ccb478a99ed167c910a83f80ba570022d53a323e  config-grsec.armhf
31098b41a807b671108546361f012b4a870d9d3532bc64ab8f36ac98a6a79908  config-virtgrsec.x86
14a9f1fc57d3c826b81148f497a9b2299c558a615fdee193e395833abec896b3  config-virtgrsec.x86_64"
sha512sums="13c8459933a8b80608e226a1398e3d1848352ace84bcfb7e6a4a33cb230bbe1ab719d4b58e067283df91ce5311be6d2d595fc8c19e2ae6ecc652499415614b3e  linux-4.4.tar.xz
f79c1eb5847f2bffd742f7fec65be11caa5158dabb28e5b90737bb82d3b254466bc3e58d7884d2df461d46e6c6b909c8ad088d911cabd0a14c70627f6570e7d3  patch-4.4.13.xz
8707073e69d18836bc75489ce744d20246a9a27f93e2693b5237485e17c03e772d232b63e1319fa1c20cc57a2f7090b7372327a6020db2e4a45507d92a5a0ab5  grsecurity-3.1-4.4.13-201604252206-alpine.patch
410fe7dae27cb4998d17a441a5b2a19dd350636ead2de97d4ef5317501d9e82e2550bfca0f022c9be6296907c076c381e1e13060d1900ff26ee7d47f234fb104  fix-spi-nor-namespace-clash.patch
9980eb10f529bc5ce482ab0a0037febbc982b528c3e4d02fc4547e6dd45dc529a7b1711d0c89f942b1ae27842c3794b68a6b8959ef80f6fd00183d3a591cea07  imx6q-no-unclocked-sleep.patch
da2ff042bb35be1517dc0233d6ff90ad437d7b20c5ab8e72c58c3186cf5233378752f0ae12f49a35f3c4c218752a50bc04ee72215f7314b97fea58e7074d871e  config-grsec.x86
34fb49b667520e7c2bbb2f6a0219b494b796d7fcf5603d129395ca4bc1567232186cb329678f9681b77c31beb75ad5c687bdcea93d268760da84493c92384694  config-grsec.x86_64
8ac8719bd3b85f54d5d6abf1aa7b5dc21641b2c1e0a9cd880acfb8ee625500f39f07787e4daae3c8a88a136197ef3cc130be8b6ce0cccaf4f418577324f01415  config-grsec.armhf
fa699c514fffed626002bfaf9a17ce63f3cd8a8f8d42229f279d504097a8fe3047d8a3c11068ff58a08b5bf26e2883fc2141b1bbd886d3fb1a91a04b93d39e1a  config-virtgrsec.x86
ba9ffcbea285ebffa0740a1ff8e5812da13d6fd51405cdf758cbb8e3d0567505e35a10add4ad7d326b1e9fce9ebe3521ccc7375082102bac5be40edee421067d  config-virtgrsec.x86_64"