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

_mainflavor=grsec
pkgname=linux-$_mainflavor
pkgver=4.4.38
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=0
pkgdesc="Linux kernel with grsecurity"
url=http://grsecurity.net
depends="mkinitfs"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers mpfr-dev
	mpc1-dev"
options="!strip"
install=
source="http://ftp.kernel.org/pub/linux/kernel/v4.x/linux-$_kernver.tar.xz
	http://ftp.kernel.org/pub/linux/kernel/v4.x/patch-$pkgver.xz
	http://dev.alpinelinux.org/~ncopa/grsec/grsecurity-3.1-$pkgver-201604252206-alpine.patch

	fix-spi-nor-namespace-clash.patch
	imx6q-no-unclocked-sleep.patch
	gcc6.patch
	gcc-default-pie.patch

	config-grsec.x86
	config-grsec.x86_64
	config-grsec.armhf

	config-virtgrsec.x86
	config-virtgrsec.x86_64
	"
subpackages="$pkgname-dev linux-virtgrsec-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="x86 x86_64 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 $source; do
		local file=${i%::*}
		case $file in
		*.patch)
			msg "Applying $file..."
			if ! patch -s -p1 -N -i "$srcdir"/${file##*/}; then
				echo $file >>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() {
	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"
		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 $_install \
		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_PATH="$_outdir"/boot \
		|| 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 $pkgdir
package() {
	depends="$depends linux-firmware"
	_package grsec "$pkgdir"
}

# subflavors install in $subpkgdir
virtgrsec() {
	_package virtgrsec "$subpkgdir"
}

_dev() {
	local _flavor="$1"
	local _abi_release=${pkgver}-${pkgrel}-$_flavor
	# 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 $_flavor kernel"
	depends="gmp-dev bash"
	local dir="$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-$_flavor.${CARCH} "$dir"/.config
	echo "-$pkgrel-$_flavor" > "$dir"/localversion-alpine \
		|| return 1
	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 "$srcdir"/build-$_flavor/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
}

dev() {
	_dev grsec
}

virtgrsec_dev() {
	_dev virtgrsec
}

md5sums="9a78fa2eb6c68ca5a40ed5af08142599  linux-4.4.tar.xz
c0233a162dfd6403c828abc86b69a062  patch-4.4.38.xz
19f336b9b9520a2b7b161dd6f4e918be  grsecurity-3.1-4.4.38-201604252206-alpine.patch
c32f1d7517a095a2645fc1c7dec5db8f  fix-spi-nor-namespace-clash.patch
b11c29ee88f7f537973191036d48bee7  imx6q-no-unclocked-sleep.patch
90e0fca6cb7bca277394b0db7f605098  gcc6.patch
736b1cec515210eee8ec243c910a4be2  gcc-default-pie.patch
6e423679bf1b0cbbe7ba31bc86b0f4da  config-grsec.x86
5caf44f1505b39e83206b8feeb4c45a7  config-grsec.x86_64
35d10d9444978dc8009e9da5e33b0f43  config-grsec.armhf
b8ee8bcd0b53d0d661bf9aac06150dd2  config-virtgrsec.x86
a2e1de5edbc62606a6642b83c61b4d7b  config-virtgrsec.x86_64"
sha256sums="401d7c8fef594999a460d10c72c5a94e9c2e1022f16795ec51746b0d165418b2  linux-4.4.tar.xz
48ec169c7adda820973b3cb9c4c91c72bb69c86f530d149065491a20ef0c4057  patch-4.4.38.xz
c68178e6a5df0b7976cbdd3c187e29814c80e89fff6bfb157cb1740c42ea7218  grsecurity-3.1-4.4.38-201604252206-alpine.patch
b8ce28c61663dbd92f7e1c862c042c88c4d0459ce15f6e6ea121e20705b66212  fix-spi-nor-namespace-clash.patch
7e8a954750139a421a76e414e19a3b57645c9ec70e6c14a6b7708a3fa0cfd5e4  imx6q-no-unclocked-sleep.patch
21640b417cb9a389bf7be6a11dc71a481ec76fcfcc758992a9be158ab6a643e8  gcc6.patch
bc2a20a2fb42480cf09f1b240435396707fd08ae2cf9ec16be9953e922a40187  gcc-default-pie.patch
2dcd3db2342d1a9600563ed52c4371668dd885d2ffb9a723be42cccfb0c88baf  config-grsec.x86
fb3d8067be53c3fa056a0c260997715e4902a2d3c96d6d459052fd221b7d96f2  config-grsec.x86_64
d975df937d5a82b48bba790bd50bf7ed04782d92755a6eeacedc9e2796633e7a  config-grsec.armhf
4f31314b11df0a3881aa44f29ac87dddd36974303a0ccf919e50e1ffa971edd3  config-virtgrsec.x86
7cc143f2061b65c835683f19fddaef4ef046f39bb17e4ba3bd8bc7b8245fae60  config-virtgrsec.x86_64"
sha512sums="13c8459933a8b80608e226a1398e3d1848352ace84bcfb7e6a4a33cb230bbe1ab719d4b58e067283df91ce5311be6d2d595fc8c19e2ae6ecc652499415614b3e  linux-4.4.tar.xz
38ba64e67b12d922da9d8aa278336009f6a798ac5ff127a9d9b87b872606d23b22d21bea63af21cccdc661cb24e9cbaa8d975f47d5ffae408fa9b3092cac15d4  patch-4.4.38.xz
7cb2977db9d467892cfdb1cae72cc51bdcfc615ae957bce7295ef19d176274fbeab08a08a0f3f58ef58451e979642b41ffbfdb96e5374229dd13edba2f2b47df  grsecurity-3.1-4.4.38-201604252206-alpine.patch
410fe7dae27cb4998d17a441a5b2a19dd350636ead2de97d4ef5317501d9e82e2550bfca0f022c9be6296907c076c381e1e13060d1900ff26ee7d47f234fb104  fix-spi-nor-namespace-clash.patch
9980eb10f529bc5ce482ab0a0037febbc982b528c3e4d02fc4547e6dd45dc529a7b1711d0c89f942b1ae27842c3794b68a6b8959ef80f6fd00183d3a591cea07  imx6q-no-unclocked-sleep.patch
edcebc229956a05621ec1c89039b56aa61b468c74b54420ff72bd08658b65d29d6af385a7d78d1ce4b39889b407106b99efe7309f8a82974a74eb9edb9e89b64  gcc6.patch
e0ce6bee9bca8bc6486df3f88e38c3177983be176249146e7e1135ef322e25357b12cbe67bf8cec9bab88911ec866a100b2e623337175bdeb94ea05fa14bd714  gcc-default-pie.patch
04c978fa501987176486d1ac7a16a01468c060ce134e779ce7fa3145d2e994bc8ab431d51c154f717897dd8c989954a66076dded8d628c633832bcd42cce172a  config-grsec.x86
3fbbe5f0bb599dd7418b545dcce29115e71b16b8d2ef60c1e27161392e2ebe73ed62570d28a7c65fb8c1ab7368ccb56fb9b536c8074a90f96a9593053e884c4c  config-grsec.x86_64
a19b8179cce90e5cfe0ee30c85c0e9fd67274290d7556a5f2cb530ba9ee5f6e941ff96f20cebbd0223f3febfe8b0e3f30c7c2696dd9184c1d3ca9dcb0eca6f4a  config-grsec.armhf
c07523775446c6cac6e2c8bd740d2647cf099a4b11aae0787259ccdf667571832185781257534657039773d68a21079b25f8e32bd32797bbbffe26d82f634bcb  config-virtgrsec.x86
b8c285676251c47e3ca69c5d7075585cc0199408a9567c6da132f8a3b34ec948821a5759e7e7b9a67666df08bf4ef0587f32433dc93387217ceeb832a6c1566a  config-virtgrsec.x86_64"