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

_mainflavor=rpi
pkgname=linux-$_mainflavor
pkgver=3.18.18
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=0
pkgdesc="Linux kernel with Raspberry Pi patches"
url=https://github.com/raspberrypi/linux
depends="mkinitfs linux-firmware"
makedepends="perl installkernel bash gmp-dev bc"
options="!strip"
install=
source="http://ftp.kernel.org/pub/linux/kernel/v3.x/linux-$_kernver.tar.xz
	http://ftp.kernel.org/pub/linux/kernel/v3.x/patch-$pkgver.xz
	http://dev.alpinelinux.org/~tteras/linux-3.18.y-rpi-20150617.patch
	aslr-pie.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="GPL-2"

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-${_abi_release}
		mkdir -p "$_dtbdir" "$_dtbdir"/overlays
		for i in arch/arm/boot/dts/*.dtb ; do
			case "$i" in
			*-overlay.dtb)	install -m644 "$i" "$_dtbdir/overlays" ;;
			*.dtb)		install -m644 "$i" "$_dtbdir" ;;
			esac
		done

		_install=zinstall
		;;
	*)
		_install=install
		;;
	esac

	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="9e854df51ca3fef8bfe566dbd7b89241  linux-3.18.tar.xz
8d2baec3d5817eb5501d5b1141279ef6  patch-3.18.18.xz
4224a13261d65db5c09e88e6a14d670b  linux-3.18.y-rpi-20150617.patch
6f5854b710be8f38f67fc7ec8f3d0625  aslr-pie.patch
52f17d154ebd339617c42318f569b979  config-rpi.armhf
1bb45f3fea9fdecb88c9d6fb8d607ec7  config-rpi2.armhf
1f3dda659442fa7e2afc62bffeceb129  markdt"
sha256sums="becc413cc9e6d7f5cc52a3ce66d65c3725bc1d1cc1001f4ce6c32b69eb188cbd  linux-3.18.tar.xz
bd43b683811ecd3b9515a3047ded08a8263f02750e335b96dfc99bf589e90d9e  patch-3.18.18.xz
82f881bfbb3f761ae4c81ec6272ee0b62f1066deb9fff9b290774f844d838638  linux-3.18.y-rpi-20150617.patch
e1db8126b13507f4442b1fa5c3d2648fa453f0ca3ea75145ec6f0faeab923c08  aslr-pie.patch
a92e574315ccbbb7de621e9c8945ae11a83c7c2cd41116b7a2a71b8c0affb656  config-rpi.armhf
571204b3caa01e40c46351f28e9ce3ed276e9111355e4ba953f898f76c8d5143  config-rpi2.armhf
289a7509bc294295b65680c7fff0b2ec07cf359ea8a57cef00267396885f9b54  markdt"
sha512sums="2f0b72466e9bc538a675738aa416573d41bbbd7e3e2ffd5b5b127afde609ebc278cec5a3c37e73479607e957c13f1b4ed9782a3795e0dcc2cf8e550228594009  linux-3.18.tar.xz
4f1c15256b9fd72f8dc97871ab680db889bdf8c7df9ba60d36054abfdc979676e9b11d74b0438021e612046f48bcae54dc57c2628c12accdcb4fcc29231aca46  patch-3.18.18.xz
f48822399d842f60d533d11be0c1eeb881d21fb69fa110d19cb0778d271e9f2bd230673a9dffca98483a317150fac62c0eb1e0fae50d85751b05fa0b7a58132f  linux-3.18.y-rpi-20150617.patch
8b2080b72cd0a1bf8f528e8a7a4ab7921ee9e1e425a5c0439e9409b599eca23ad992f5fec67924da736c20de9728c7f0cb2f3087212a278e82ba8ecfc8fac7d0  aslr-pie.patch
cd3c88c5d66b4b809cc1fb3420479e2dd3d6d7c85b7bcccbb2348d01934fd1a878f3047f3dcb616687634e9f8024e3fd4ad94246c02e44a173991ce4ff526b5b  config-rpi.armhf
c3c8f5563f0e3b2aa4c4231e7c01c5724b628a51720296e31801de0d04076ce8cf178315f13502b5388ba5b325ef02e03d72adfb694564ad2f4aeeefa40e2cbc  config-rpi2.armhf
89601aa0e4f77fb07fb1d58c6a9394c8683bc7dfc905ca6612d607ef4188637662d295fa3d5640e3e0a4cd08c98c10511a4f3cea41e7568167b12d0a6c813e8b  markdt"