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

_flavor=vanilla
pkgname=linux-${_flavor}
pkgver=4.1.20
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=0
pkgdesc="Linux vanilla kernel"
url="http://kernel.org"
depends="mkinitfs linux-firmware"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers"
options="!strip"
_config=${config:-config-vanilla.${CARCH}}
install=
source="http://ftp.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz

	config-vanilla.armhf
	config-vanilla.x86
	config-vanilla.x86_64
	"
if [ "${pkgver%.0}" = "$pkgver" ]; then
	source="$source
	http://ftp.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/patch-$pkgver.xz"
fi
subpackages="$pkgname-dev"
arch="all"
license="GPL2"

_abi_release=${pkgver}

prepare() {
	local _patch_failed=
	cd "$srcdir"/linux-$_kernver
	if [ "$_kernver" != "$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

	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

	local _install
	case "$CARCH" in
	arm*)
		local _dtbdir="$pkgdir"/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 $_install \
		INSTALL_MOD_PATH="$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"
	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="fe9dc0f6729f36400ea81aa41d614c37  linux-4.1.tar.xz
61e385e0bc2e856ae0200f5c8361b02a  config-vanilla.armhf
22bb136e64e433246074b577c45a5ea2  config-vanilla.x86
0723f612aacefa88887bfbd25e5345a8  config-vanilla.x86_64
06faf67e8b926915b94970981c3645e3  patch-4.1.20.xz"
sha256sums="caf51f085aac1e1cea4d00dbbf3093ead07b551fc07b31b2a989c05f8ea72d9f  linux-4.1.tar.xz
37b9484f1cd9a81cf7a10b519f41b1e7b474fbda985d11ed44b59361a4dabf71  config-vanilla.armhf
aa50412071c4b949379f239d103f96d038b8ef4a5cd643dc555419d5a94568c5  config-vanilla.x86
4ea03d91bbb0582530ca26800e51bc1d96b7f663edc840923a5fe7b738c90d72  config-vanilla.x86_64
c9cb7370fe790df645a13967919628e5bcf1ff333f334fedac6a3c474714c45d  patch-4.1.20.xz"
sha512sums="168ef84a4e67619f9f53f3574e438542a5747f9b43443363cb83597fcdac9f40d201625c66e375a23226745eaada9176eb006ca023613cec089349e91751f3c0  linux-4.1.tar.xz
e9309320b28bfc80ad1f44379f1615b4bc42c44b9cf52da2c8bc404282a1e758f5575a054ae59d5ceb4cc67bb194fc9eaac337f511ef1febae6d377750b922e9  config-vanilla.armhf
e7e14e66e884e920ad4d09ff778d6259914d935a1698b336427e56efd2288ac65da081c397ca29010ed46676b033b5632224bf18d52617546c6342e7e9016c2e  config-vanilla.x86
f71352eeafecd088cc428836657631e7f2a4d2bf659ea8b0c4f5939f4a4cbadaa7c2e674bc025f24a4c653b9273f9e2ee4ba2d145b732d2b6dfd4531db0d4486  config-vanilla.x86_64
5c919982d33270c75b49e1deda32a9704ac8c68c4f07595471357c6b98694a4429dbd85bb31f662e63150294c031205b2d31426e117d0197ce7afdfd45f1c313  patch-4.1.20.xz"