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

_mainflavor=rpi
pkgname=linux-$_mainflavor
pkgver=4.1.10
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-20151006.patch
	0001-inet-fix-potential-deadlock-in-reqsk_queue_unlink.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
599cb082ef44d8fb76ad8fd49d1b50fc  patch-4.1.10.xz
161b4c74b6071d5bfb51ac5175cbab04  linux-4.1.y-rpi-20151006.patch
ffa7fdc282af20f2b48b95b2687b7452  0001-inet-fix-potential-deadlock-in-reqsk_queue_unlink.patch
242b81099d0eec85103a59a65ad9bf3e  config-rpi.armhf
9b055df73d3876d73700f63136628183  config-rpi2.armhf
1f3dda659442fa7e2afc62bffeceb129  markdt"
sha256sums="caf51f085aac1e1cea4d00dbbf3093ead07b551fc07b31b2a989c05f8ea72d9f  linux-4.1.tar.xz
929e210fe6dbd5dd26812c146630be14e979aae6c960a2feb39544babb8e73cb  patch-4.1.10.xz
777909c66d87d0f18796cc4fe426a30ae89ce20380c62ae00976bbffd28374ec  linux-4.1.y-rpi-20151006.patch
c56583010561ca7d7b5e5aa3eed67c939f67deb2d22af7155e475c10baa4d7a5  0001-inet-fix-potential-deadlock-in-reqsk_queue_unlink.patch
7a49802d041ef18ccfd8127581982638c4c3ca8f8352b179fe74dfa996daf374  config-rpi.armhf
e5a00767290bb542388d4a7daa8f6331b563880e03def85ec1fd2a09fb7f9b84  config-rpi2.armhf
289a7509bc294295b65680c7fff0b2ec07cf359ea8a57cef00267396885f9b54  markdt"
sha512sums="168ef84a4e67619f9f53f3574e438542a5747f9b43443363cb83597fcdac9f40d201625c66e375a23226745eaada9176eb006ca023613cec089349e91751f3c0  linux-4.1.tar.xz
3b5cb5c8f494958c39a06a1b416e3e5a075a3c76c44f8bf1ae5a14deec9861407100c2ef59b0720e8fc0729b5c8422b4d819ff59f1f7ec4eed20c5ba8a95d6d5  patch-4.1.10.xz
fa9022592a4ea1ce7cc2cadac672ba120471be6453f40acef8b8ac6ad50fa36701bd4ebe335507dff848d335c2b7f4e74ec0313ea039edfa7a35900c31639097  linux-4.1.y-rpi-20151006.patch
32ae58cf74d5e02cb09445be35772dad0a517949bd1836f8dbc90b871de67901b61dba5eccdc2a795a9f7e5c06831335504a738205eb49768f7424cf30ddd8ae  0001-inet-fix-potential-deadlock-in-reqsk_queue_unlink.patch
103c7ea030b8cf8dc7d26e426236b24a13841e6d7b698cd172990be2198286d35d70b13e4b6ea4ca8517d5443305d0447662205bfe4c963b332543e2e5d7be0c  config-rpi.armhf
012a7fdacfac2cd851010dd72ed772c82c9622eb1a36e47f372341c6d32ba6ef686b22515ae347c69db14e9648d4d7e3897b13751a816c351d0098cabf979b3c  config-rpi2.armhf
89601aa0e4f77fb07fb1d58c6a9394c8683bc7dfc905ca6612d607ef4188637662d295fa3d5640e3e0a4cd08c98c10511a4f3cea41e7568167b12d0a6c813e8b  markdt"