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

_flavor=grsec
pkgname=linux-${_flavor}
pkgver=3.13.7
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=0
pkgdesc="Linux kernel with grsecurity"
url=http://grsecurity.net
depends="mkinitfs linux-firmware"
makedepends="perl sed installkernel bash gmp-dev bc"
options="!strip"
_config=${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-3.0-3.13.7-201403252047.patch

	fix-memory-map-for-PIE-applications.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

	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="0ecbaf65c00374eb4a826c2f9f37606f  linux-3.13.tar.xz
cb33b329d3417846d310c7f58a2614b6  patch-3.13.7.xz
00dbb1fb5bfc08842d97c02ece67e441  grsecurity-3.0-3.13.7-201403252047.patch
c6a4ae7e8ca6159e1631545515805216  fix-memory-map-for-PIE-applications.patch
37865a61f0319c558d05568f34fa11e7  kernelconfig.x86
3949ef829d102d36255ff92ff76936d2  kernelconfig.x86_64"
sha256sums="4d5e5eee5f276424c32e9591f1b6c971baedc7b49f28ce03d1f48b1e5d6226a2  linux-3.13.tar.xz
4e7a062493c2a0dd2f2aa0ec636a47b2b1785aebccf652ae56e68f0dfc083f89  patch-3.13.7.xz
2bd65311a72df142f5b4f7be20f4b1e26fc62c076dba9991f0efba12dc847538  grsecurity-3.0-3.13.7-201403252047.patch
500f3577310be52e87b9fecdc2e9c4ca43210fd97d69089f9005d484563f74c7  fix-memory-map-for-PIE-applications.patch
f8297eb16cfbe48d5202072e21fa16ebac95de26c8cfa8ec5a66610504af2f81  kernelconfig.x86
fd55e28d9baf330d6593453da592bcc03779694e7c3fb496fec47cdad1d7bcaa  kernelconfig.x86_64"
sha512sums="1ba223bb4b885d691a67196d86a8aaf7b4a1c351bf2a762f50f1b0c32da00dd0c28895872a66b49e8d244498d996876609268e64861d28ac4048886ef9f79b87  linux-3.13.tar.xz
bee628e25d8ed378fd32d0e96ac20f24d1bef2950377cee249b65db918bd528a744cc1058006f9e945095ccc81805d715eb27e5c36f2515c7dcfdf5fe6b6c7a6  patch-3.13.7.xz
f118a017084f8dee3d5ae0f9435f96e9e5cff7c2d4672855622133cc6fd811c4e481c6b6f907b43c691f0531bfaf168dbd08877e29c25da82989492bc4186de4  grsecurity-3.0-3.13.7-201403252047.patch
4665c56ae1bbac311f9205d64918e84ee8b01d47d6e2396ff6b8adfb10aada7f7254531ce62e31edbb65c2a54a830f09ad05d314dfcd75d6272f4068945ad7c7  fix-memory-map-for-PIE-applications.patch
852e46d89f9a445a1c5400f1dbbdefc93667f68a58a1b4ecc7dcad4cb125e1c3d11971ca8f33ef04a0c5a117293b3012c8a758c68edf7f0a300a80a81e686d64  kernelconfig.x86
16083f764d700959dfc066e524554011743b9ea4e6ca0db1c73b22e36cd0a6ca0dffd293fb758ea50f0a930e26b149a27e27e58728b500bb7f5b81f7b973d1cf  kernelconfig.x86_64"