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

_mainflavor=rpi
pkgname=linux-$_mainflavor
pkgver=4.1.13
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-20151119.patch
	rpi-dma-i2s-fix.patch
	rpi-cirrus-4.1.x-20151025.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
e1005015404c53692e8aa6dd14efff74  patch-4.1.13.xz
351cb861020321c0fd23fdc5a201463a  linux-4.1.y-rpi-20151119.patch
52787712305201c60ab9bc128c9e373b  rpi-dma-i2s-fix.patch
e3429d7772cb3bf73ff4c51aabb2a5cf  rpi-cirrus-4.1.x-20151025.patch
cb71e2a517e7d019596eab9cbc91a080  config-rpi.armhf
59f634c4646dab6bc1fe059efaf773e9  config-rpi2.armhf
e587cae1dca2f5992555d9bcf53deecf  markdt"
sha256sums="caf51f085aac1e1cea4d00dbbf3093ead07b551fc07b31b2a989c05f8ea72d9f  linux-4.1.tar.xz
1c3ba78cbaa1a260798d6d0d2aa319ff41ae676b443e5bf06ab441436dcdd171  patch-4.1.13.xz
cdb26705b8841bbadcf4e862dc3f582049fe8169a4951e4c4a34de1f3dac4293  linux-4.1.y-rpi-20151119.patch
f1349b95149f4a21949ebc3dae1c2b144278d170322afeb7975d2cea7f64f10c  rpi-dma-i2s-fix.patch
b1b5b8bf16e2eacec19931279984f2bc96851da6e9786d4c9422caa1ac7af2fe  rpi-cirrus-4.1.x-20151025.patch
c38d092ae49c4d3f642c4a99432d139092c331f2b33e81c5855b38381ad79411  config-rpi.armhf
5f450314b5af2d6079d32c3a67eb7df49dd73c4732cff392a953b19838fa6e6a  config-rpi2.armhf
0f6681fc5c3590e1dbe13a2bde796403bd1529cf0fe19720899eaa0db79bcb49  markdt"
sha512sums="168ef84a4e67619f9f53f3574e438542a5747f9b43443363cb83597fcdac9f40d201625c66e375a23226745eaada9176eb006ca023613cec089349e91751f3c0  linux-4.1.tar.xz
0fa60b9fceb6103c11ed1df8d4f264d1c4efcd75da258709f1d0a6813f8117977fa2279b36da22bd69cc2bc808b092207a438c2e80a65a988f4c72363a605832  patch-4.1.13.xz
cae26e2303fccf5246d1b3f8c78425860410ad7667ab7a9805497493d4926978b99ebe95486f00324e3af9cd86fb9e1965f719531ccff9c56efab8ea29b180d0  linux-4.1.y-rpi-20151119.patch
080ba354e40f86338278339b8b3fc2cfd5b77c38c34067b0b7e2b31d07834baf99b3bf04153844e86433bda6fc0de5d86679e1d99521109b1a9a5dbeee6df2b6  rpi-dma-i2s-fix.patch
3e4717c21def19d7c9714b1d9d07f8dbf8fd27e986cbd978eda50c586cc21d1399b50db4255589d09abb6fe5b532c3959481098f229c4ea4526a044fc1da17b0  rpi-cirrus-4.1.x-20151025.patch
69b5beae27dc58e7e7cf1aa351923a980ae453b39f9092fe97220f0b508f46e7e45197da22a2088723bafd6f9293c31475741c63a9ed8e587a1d45392addb9af  config-rpi.armhf
7d2f238f0a460fa4cbf6b26188fdbe8241a07846eaf3f6c6f4be33bdb836e9e26c58312109d51092e6faeb304c9281541c62da46539faa1614ef4c1bdacc08eb  config-rpi2.armhf
a4ecd1f48db64f9d6a189250d1937d7f2cd3a049a3d24cc527d04d05db06137722f1ba44bcd6033794781c3f2cfe2fbe065410a16de4bfdf4b1cd95d89322a77  markdt"