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

_mainflavor=rpi
pkgname=linux-$_mainflavor
pkgver=4.1.15
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=0
pkgdesc="Linux kernel with Raspberry Pi patches"
url=https://github.com/raspberrypi/linux
depends="mkinitfs linux-firmware"
makedepends="perl installkernel bash gmp-dev bc"
options="!strip"
install=
source="http://ftp.kernel.org/pub/linux/kernel/v4.x/linux-$_kernver.tar.xz
	http://ftp.kernel.org/pub/linux/kernel/v4.x/patch-$pkgver.xz
	http://dev.alpinelinux.org/~tteras/linux-4.1.y-rpi-20151218.patch
	rpi-cirrus-4.1.y-20151218.patch
	gpio-mcp23s08-pullups.patch

	config-rpi.armhf
	config-rpi2.armhf
	markdt
	"
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="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-${_abi_release}
		cd "$srcdir"/build-$_buildflavor/arch/arm/boot/dts || return 1
		mkdir -p "$_dtbdir"
		find . -name "*.dtb" -type f | cpio -pdm "$_dtbdir"
		_install=zinstall
		;;
	*)
		_install=install
		;;
	esac

	cd "$srcdir"/build-$_buildflavor || return 1
	make -j1 modules_install firmware_install $_install \
		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_PATH="$_outdir"/boot \
		|| return 1

	# tell rpi bootloader we are device tree capable
	"$srcdir"/markdt "$_outdir"/boot/vmlinuz-$_buildflavor \
		|| 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 $pkgdir
package() {
	_package rpi "$pkgdir"
}

# subflavors install in $subpkgdir
rpi2() {
	_package rpi2 "$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-$_mainflavor.${CARCH} "$dir"/.config
	make -j1 -C "$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 "$srcdir"/build-$_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
6b091b3432dfde5452b3d1c9239622f2  linux-4.1.y-rpi-20151218.patch
d4b70738cf06dbd70534d5e873442951  rpi-cirrus-4.1.y-20151218.patch
b66e8aa4991ca5c2ccd61559ed7e6491  gpio-mcp23s08-pullups.patch
3b645eef5408cbbcf9c6b13581ef775a  config-rpi.armhf
1c21e249ea27b70dd5e0a7b69820fdee  config-rpi2.armhf
e587cae1dca2f5992555d9bcf53deecf  markdt"
sha256sums="caf51f085aac1e1cea4d00dbbf3093ead07b551fc07b31b2a989c05f8ea72d9f  linux-4.1.tar.xz
0ffca8557f1aa191da2f2260ad279c9cc858e6308a8af8a76f7ca3d3c0540344  patch-4.1.15.xz
21dded436f0ff6f36fdc630c406b179820a13403f18c9c221c41d98cc9b77b4b  linux-4.1.y-rpi-20151218.patch
5aa17a1554598c3b364b7e8aea84bacfc13e8aca9b9101e58d89c211674a3d5a  rpi-cirrus-4.1.y-20151218.patch
b389a556bbd98053881b43deef1adf20640f980557c5f37cfd7ece2daeecbda9  gpio-mcp23s08-pullups.patch
7eb3025189c64f4023db864169dcc9d64d029fc871d0ffbc59621292a338772a  config-rpi.armhf
10318f14c68a7fafe3b1a8f3208c8586dabce5c01598a4bf7a2da76166b273b4  config-rpi2.armhf
0f6681fc5c3590e1dbe13a2bde796403bd1529cf0fe19720899eaa0db79bcb49  markdt"
sha512sums="168ef84a4e67619f9f53f3574e438542a5747f9b43443363cb83597fcdac9f40d201625c66e375a23226745eaada9176eb006ca023613cec089349e91751f3c0  linux-4.1.tar.xz
646daf16c01fb8c3013c7c9919c18c3635eb6bd37560623cb56cc7a6d0b22fb13290cee8865dfbcc435cd8544cc3ecb6f3aae538d10c9e0b1098806f233155a3  patch-4.1.15.xz
9ca5c2c0417fc091f46393a7b84b4f8520fa7e21ce6f4c6987966f535388c97e92ffaf8044c80182be584d37b458f9c95b0cf0d8bd86ba3b5cbef1e47b2178bc  linux-4.1.y-rpi-20151218.patch
843afc1f2a72fa9618935dd67d4ac33a22ee78f20114af349f8d93e54864375b3ef192c8d8fde814d6685d5fe675c2a850743834ef89640eedce9f4db5ffdb67  rpi-cirrus-4.1.y-20151218.patch
36724ba56cb8fdf3a3d347cffb67ae1cc3d7b1052d526b6b5134ebf6baae9f9724b586c97833453dc7697ab24699426f0749af78b6a80be36967a80033a0cf40  gpio-mcp23s08-pullups.patch
51f7fcacb9fb05aa14e7ee7890f7726ce4b0001496cfe9ca2152693c2acf5fefbfa654d2d4f26058aa3b617141f29cff7e0427c30e291209829ab1e44c6412ba  config-rpi.armhf
1e249312b12e5d247ca7e250653afbacb5bc9d23983eaa4d552ff5b28c2dc0b0302a1c6af499fa59fa166a31e067fddae191bd977b0bd13773a66c81ca398f93  config-rpi2.armhf
a4ecd1f48db64f9d6a189250d1937d7f2cd3a049a3d24cc527d04d05db06137722f1ba44bcd6033794781c3f2cfe2fbe065410a16de4bfdf4b1cd95d89322a77  markdt"