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

_mainflavor=grsec
pkgname=linux-$_mainflavor
pkgver=4.1.15
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/~tteras/grsec/pax-linux-4.1.15-test24-alpine.patch
	http://dev.alpinelinux.org/~tteras/grsec/grsec-4.1.15-3.1-201509112213-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"
_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
		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

	# 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"
}

# we only provide -dev for main flavor for now
dev() {
	local _abi_release=${pkgver}-${pkgrel}-$_mainflavor
	# copy the only the parts that we really need for build 3rd party
	# kernel modules and install those as /usr/src/linux-headers,
	# simlar to what ubuntu does
	#
	# this way you dont need to install the 300-400 kernel sources to
	# build a tiny kernel module
	#
	pkgdesc="Headers and script for third party modules for grsec kernel"
	depends="gmp-dev bash"
	local dir="$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-grsec.${CARCH} "$dir"/.config
	echo "-$pkgrel-grsec" > "$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 "$srcdir"/build-$_mainflavor/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="fe9dc0f6729f36400ea81aa41d614c37  linux-4.1.tar.xz
5ec05841161a172f8ae1a7f38bb382b0  patch-4.1.15.xz
d23ac8110941baf0f37f9e3a011e3720  pax-linux-4.1.15-test24-alpine.patch
ba5670790e9ee117227024cb4b187756  grsec-4.1.15-3.1-201509112213-alpine.patch
b0337a2a9abed17c37eae5db332522d2  fix-spi-nor-namespace-clash.patch
1a307fc1d63231bf01d22493a4f14378  imx6q-no-unclocked-sleep.patch
f8eec4df8fcd64f5f4810a2840e8cee7  config-grsec.x86
dcccfa220ed2b2041971492d1dfa9440  config-grsec.x86_64
cf395fd923139074f3f1095c29a63e2b  config-grsec.armhf
28754e558f94f3b3e0b0fcc27c1c955f  config-virtgrsec.x86
e1ee16152cd6b92aef67466e1710cf87  config-virtgrsec.x86_64"
sha256sums="caf51f085aac1e1cea4d00dbbf3093ead07b551fc07b31b2a989c05f8ea72d9f  linux-4.1.tar.xz
0ffca8557f1aa191da2f2260ad279c9cc858e6308a8af8a76f7ca3d3c0540344  patch-4.1.15.xz
5cb29b9a0ffb72c11ff17a0c68a9bb6452ca15b79eb1fc00c179cdf1748f2d48  pax-linux-4.1.15-test24-alpine.patch
a92b81dbd4fa4fbee28cebad93b0bd623820c809e98e8841151842341b9626eb  grsec-4.1.15-3.1-201509112213-alpine.patch
01279cfb93273d99670c56e2465957ecde3d03693beeb929a743f03afa0b7bdc  fix-spi-nor-namespace-clash.patch
21179fbb22a5b74af0a609350ae1a170e232908572b201d02e791d2ce0a685d3  imx6q-no-unclocked-sleep.patch
b179db21c31861da5da8a49307994e11e6a6b83d88fb3dffcf20b369ab32f8e6  config-grsec.x86
f2c3a2b565346baa29bdf48bab6da6fcfa1723b505237ef33a0655bf80ef2e18  config-grsec.x86_64
b996d6fc9eb8bd453826fb9c0ae573ef42a6fff3193adf33c2bf14480924ca16  config-grsec.armhf
fcfeedde29606b94f79f79ceb9351bd5d018aca6a76bba04459d85e4ad94939f  config-virtgrsec.x86
a3f09fc1092ecf4456980a6e2e723a9ea95746e0da5bf4a7363046614dc6ffd8  config-virtgrsec.x86_64"
sha512sums="168ef84a4e67619f9f53f3574e438542a5747f9b43443363cb83597fcdac9f40d201625c66e375a23226745eaada9176eb006ca023613cec089349e91751f3c0  linux-4.1.tar.xz
646daf16c01fb8c3013c7c9919c18c3635eb6bd37560623cb56cc7a6d0b22fb13290cee8865dfbcc435cd8544cc3ecb6f3aae538d10c9e0b1098806f233155a3  patch-4.1.15.xz
e5bb53ac77a4b285fa4dd52cf50856669cb932669c2c8b1b9cd14d2384375d1ce9e997a760848c2c2e2c428e5d3c1c41aad890ee4009c9c4653d3a13721eab7a  pax-linux-4.1.15-test24-alpine.patch
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4e3aeb70712f9838afea75fe9e6c1389414d833a89286ea55441d6a8d54ce74b0e39b565721e3153443af0a614bff57c767251b7e5b81faa5e0784eddfcd2164  fix-spi-nor-namespace-clash.patch
87d1ad59732f265a5b0db54490dc1762c14ea4b868e7eb1aedc3ce57b48046de7bbc08cf5cfcf6f1380fa84063b0edb16ba3d5e3c5670be9bbb229275c88b221  imx6q-no-unclocked-sleep.patch
b31862d0998cbe72882f2db3ab9452051bb5202a3921f5f4aebb24727a187227792af88c6b6ceef8ff28ab34123d1321bb8d06656f37c844afcf566571ba8865  config-grsec.x86
87c4c3be53f03ee6e7c4fa1853b43c506ee5d35d4c156b5030424b7712e469521898a56c0b6a4562e31ea2bca855dae7429ea9048f9d2fa8b29db2d14211d230  config-grsec.x86_64
aecd465ceb265355ef71c213ee589cc18c7695589e3410fb8762669d5f728a7e071e1b05e3864a8c621dec870a472a0e1075b2b335fafabfe62891c7d746161d  config-grsec.armhf
caec0c97bfd25c9cc6921addc8b39941284a38746d5b9c5f19c0f1fe679d9f4c6ee7881a2eb95a16dcfbb082486435f467d27d539405ee6094b70d13b3bf2276  config-virtgrsec.x86
36f4cb73009cb5cf9f8e52ceae3537e8d84f4eaa1a7aa3850c893472cc661ce76b65b88403a3d7fa0bf31b179ac030bf0b8a1188214c771ebbc1c92c95d398a2  config-virtgrsec.x86_64"