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

_mainflavor=hardened
pkgname=linux-$_mainflavor
pkgver=4.9.70
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=0
pkgdesc="Linux kernel with hardening patches"
url="http://alpinelinux.org"
depends="mkinitfs"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers mpfr-dev
	mpc1-dev elfutils-dev"
options="!strip !check"
install=
source="https://kernel.org/pub/linux/kernel/v4.x/linux-$_kernver.tar.xz
	https://kernel.org/pub/linux/kernel/v4.x/patch-$pkgver.xz
	http://dev.alpinelinux.org/~ncopa/grsec/hardened-3.1-$pkgver-201704252333-alpine2.patch
	0001-HID-apple-fix-Fn-key-Magic-Keyboard-on-bluetooth.patch
	zfs-fix.patch

	config-hardened.x86
	config-hardened.x86_64
	config-hardened.armhf

	config-virthardened.x86
	config-virthardened.x86_64
	"
subpackages="$pkgname-dev:_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-${_f} linux-${_f}-dev:_dev"
		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"
	provides="linux-grsec=${pkgver}-r${pkgrel}"

	_package hardened "$pkgdir"
}

# subflavors install in $subpkgdir
virthardened() {
	provides="linux-virtgrsec=${pkgver}-r${pkgrel}"

	_package virthardened "$subpkgdir"
}

_dev() {
	local _flavor=$(echo $subpkgname | sed -E 's/(^linux-|-dev$)//g')
	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 points 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/ubuntu/ubuntu-zesty.git/tree/debian/rules.d/3-binary-indep.mk
	cd "$srcdir"/linux-$_kernver
	find .  -path './include/*' -prune \
		-o -path './scripts/*' -prune -o -type f \
		\( -name 'Makefile*' -o -name 'Kconfig*' -o -name 'Kbuild*' -o \
		   -name '*.sh' -o -name '*.pl' -o -name '*.lds' \) \
		-print | cpio -pdm "$dir" || return 1

	cp -a scripts include "$dir" || return 1
	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
}

sha512sums="bf67ff812cc3cb7e5059e82cc5db0d9a7c5637f7ed9a42e4730c715bf7047c81ed3a571225f92a33ef0b6d65f35595bc32d773356646df2627da55e9bc7f1f1a  linux-4.9.tar.xz
2341d32cdf26c9e201637ddaa5f9f4097e68259b56253c4c91646ff8d94f9bf8f3a9afa02ee5781d324db539d12ea5dc24769a3fd696097fa5ec7fb3b9b19c0e  patch-4.9.70.xz
ba52e3005f09e4cca58a01689fbc9f8acbcf0950976c51a451e1b6bfc6bf79eea078258fc8553931a4dc8f1f88589f7b412d867309cf69ec2e5fe1933e2d5f6d  hardened-3.1-4.9.70-201704252333-alpine2.patch
5373728be2b507c3db5e042e1d768740df7965078868afdc46418b1adc4cae3d8f9f1aedb59975a0f2acf8754340499354fcf97c503397a5d9886ccc9689b782  0001-HID-apple-fix-Fn-key-Magic-Keyboard-on-bluetooth.patch
5a0a78e6de11eb8180d96830b9faa9ac560586f7beb663c8196a16ac6232b5008b9181b3c9b94e2b13a444acba4b6e80a3408d34606432f92eb4d169c3953d5d  zfs-fix.patch
72ebda2e8f54047ff1884bcde9f2a0b02bbe5d2b210eff484b165963c53f22413d3513c36e00bc6114e9ee34bb1e3f289cdf82215a3685f2301f0e4deef62829  config-hardened.x86
1e13bc435bac66e5e5f246e4571f018db6efff95fc3de779a4d4cedf81705965d34c92335f81851d6e8051a055e3da719aba305589b844d67b842ea63d4e2bd8  config-hardened.x86_64
5f7c5f7f0f040c1d6e4bf9bba0febe1c3a874b9d1fa5285ab487940aa02b3909b28bae4939329e151373a58ea5deb2575439632c05e47ce817c37668a5b9eb58  config-hardened.armhf
f455bb8a70b8e7b77779843f4007fd3de6a1649d85a1e62f04f94e11705c5204716641cf8f19aff6b3873af22fe355f9e1f3539fbc4b7ead81bd8cd0ab96bb30  config-virthardened.x86
290a17d7956202ad4018102568f8aa5d79e34927cd8cce946d391a3ed6591bcd499c8978a5b2fc941a9cb4b68e7cd3e347c3a8b5f39ad1e964537d8aa6d17328  config-virthardened.x86_64"