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

_mainflavor=grsec
pkgname=linux-$_mainflavor
pkgver=4.1.12
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=1
pkgdesc="Linux kernel with grsecurity"
url=http://grsecurity.net
depends="mkinitfs"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers mpfr-dev
	mpc1-dev"
options="!strip"
install=
source="http://ftp.kernel.org/pub/linux/kernel/v4.x/linux-$_kernver.tar.xz
	http://ftp.kernel.org/pub/linux/kernel/v4.x/patch-$pkgver.xz
	http://dev.alpinelinux.org/~tteras/grsec/pax-linux-4.1.11-test24-alpine.patch
	http://dev.alpinelinux.org/~tteras/grsec/grsec-4.1.y-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
e790ae84e0109a3d95cc617be448171b  patch-4.1.12.xz
15977c12236e3a4f8f61c74ce90a4402  pax-linux-4.1.11-test24-alpine.patch
d4d64785f2ff77db38477b3da0d86f9a  grsec-4.1.y-3.1-201509112213-alpine.patch
b0337a2a9abed17c37eae5db332522d2  fix-spi-nor-namespace-clash.patch
1a307fc1d63231bf01d22493a4f14378  imx6q-no-unclocked-sleep.patch
1bcf1c98ab042ae7868aca90e0ceaaee  config-grsec.x86
ff2951230d00d1cb295031c682863748  config-grsec.x86_64
c4486da497494f746e54cf82cf2e153f  config-grsec.armhf
28754e558f94f3b3e0b0fcc27c1c955f  config-virtgrsec.x86
e1ee16152cd6b92aef67466e1710cf87  config-virtgrsec.x86_64"
sha256sums="caf51f085aac1e1cea4d00dbbf3093ead07b551fc07b31b2a989c05f8ea72d9f  linux-4.1.tar.xz
f3520b06e6a2b9929173c680de75f11cde9f0a380e04195d538b5de820a549ae  patch-4.1.12.xz
ed4626d4de2a283ac087617ebee5ec17e28b372ca060ae83bfd2b2e2cf0bb7f4  pax-linux-4.1.11-test24-alpine.patch
7258089a5e2d5ca65135e47cf13400c47a657f5b2f6ef3f2e2b7383a758e00f8  grsec-4.1.y-3.1-201509112213-alpine.patch
01279cfb93273d99670c56e2465957ecde3d03693beeb929a743f03afa0b7bdc  fix-spi-nor-namespace-clash.patch
21179fbb22a5b74af0a609350ae1a170e232908572b201d02e791d2ce0a685d3  imx6q-no-unclocked-sleep.patch
d9fa91765f13f00fff2a4bb39e6ecf91940ff4e83e9b4ade5783eab4b7c0faac  config-grsec.x86
79cf436f28b723eaeae721e2ae5d2cd1aad5a6e16080cf314c481d5278d7346b  config-grsec.x86_64
6e6fdaab4a9229d4e3bd0e68e5ee7d5bf2562215a72cf16f98071015cd98ba52  config-grsec.armhf
fcfeedde29606b94f79f79ceb9351bd5d018aca6a76bba04459d85e4ad94939f  config-virtgrsec.x86
a3f09fc1092ecf4456980a6e2e723a9ea95746e0da5bf4a7363046614dc6ffd8  config-virtgrsec.x86_64"
sha512sums="168ef84a4e67619f9f53f3574e438542a5747f9b43443363cb83597fcdac9f40d201625c66e375a23226745eaada9176eb006ca023613cec089349e91751f3c0  linux-4.1.tar.xz
164f216faa8fef6a28fe03bdb69c7bee5ff99cf560271264b52e62aec63c1d4d6475d4a6f2b4b4c02d235568ebe8bafd3b36be75c8a505cde8edbb70136d89b4  patch-4.1.12.xz
67bcf3f23a9ee93186e3307d0344a11a9172137d176182ac63b50960eccf9cc0ee476cde7aaee266b98b6121a3efbafdfa41466724e6b04057e91f839eaa636f  pax-linux-4.1.11-test24-alpine.patch
7d25216434876e4cdbab9c3a37f554a1ad908416c2afa8b70e92d681029accdd120c9ee4e5ed3df54f806920f05e0e29f0e06fc417083b953e26401be350858d  grsec-4.1.y-3.1-201509112213-alpine.patch
4e3aeb70712f9838afea75fe9e6c1389414d833a89286ea55441d6a8d54ce74b0e39b565721e3153443af0a614bff57c767251b7e5b81faa5e0784eddfcd2164  fix-spi-nor-namespace-clash.patch
87d1ad59732f265a5b0db54490dc1762c14ea4b868e7eb1aedc3ce57b48046de7bbc08cf5cfcf6f1380fa84063b0edb16ba3d5e3c5670be9bbb229275c88b221  imx6q-no-unclocked-sleep.patch
98eaa89a171bef67c59c51ad91ea764992a10cfbcce5b1ad01fbbb576f05de6db4dfbb5eabc166994ae7faacb7e89f53580fc0e609e4eebc7e5c8b1fe2d38b7f  config-grsec.x86
e441d0d7f0575656773e25c4cbde6668aaf1e96942482b5cecd78704b386d2be206104a501945476f5ff12af5a822c56af45a1d79d3e85b28afa3132cdd58062  config-grsec.x86_64
6bd17b168a3f083247e673cf9a8786059969796d4962fe6442f453fa3eae06f8c93131270d0cea2c0cb36515bd3cae4896c97ccf6c58c7cb9657843b31a1f307  config-grsec.armhf
caec0c97bfd25c9cc6921addc8b39941284a38746d5b9c5f19c0f1fe679d9f4c6ee7881a2eb95a16dcfbb082486435f467d27d539405ee6094b70d13b3bf2276  config-virtgrsec.x86
36f4cb73009cb5cf9f8e52ceae3537e8d84f4eaa1a7aa3850c893472cc661ce76b65b88403a3d7fa0bf31b179ac030bf0b8a1188214c771ebbc1c92c95d398a2  config-virtgrsec.x86_64"