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# Maintainer: Natanael Copa <ncopa@alpinelinux.org>
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_mainflavor=grsec
pkgname=linux-$_mainflavor
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pkgver=4.4.45
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case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
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pkgrel=0
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pkgdesc="Linux kernel with grsecurity"
url=http://grsecurity.net
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depends="mkinitfs"
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makedepends="perl sed installkernel bash gmp-dev bc linux-headers mpfr-dev
	mpc1-dev"
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options="!strip"
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install=
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source="http://ftp.kernel.org/pub/linux/kernel/v4.x/linux-$_kernver.tar.xz
	http://ftp.kernel.org/pub/linux/kernel/v4.x/patch-$pkgver.xz
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	http://dev.alpinelinux.org/~ncopa/grsec/grsecurity-3.1-$pkgver-201604252206-alpine.patch
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	fix-spi-nor-namespace-clash.patch
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	imx6q-no-unclocked-sleep.patch
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	gcc6.patch
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	config-grsec.x86
	config-grsec.x86_64
	config-grsec.armhf

	config-virtgrsec.x86
	config-virtgrsec.x86_64
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	"
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subpackages="$pkgname-dev:_dev linux-virtgrsec-dev:_dev"
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_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

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arch="x86 x86_64 armhf"
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license="GPL2"
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prepare() {
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	local _patch_failed=
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	cd "$srcdir"/linux-$_kernver
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	if [ "${pkgver%.0}" = "$pkgver" ]; then
		msg "Applying patch-$pkgver.xz"
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		unxz -c < "$srcdir"/patch-$pkgver.xz | patch -p1 -N || return 1
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	fi

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	# first apply patches in specified order
	for i in $source; do
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		local file=${i%::*}
		case $file in
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		*.patch)
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			msg "Applying $file..."
			if ! patch -s -p1 -N -i "$srcdir"/${file##*/}; then
				echo $file >>failed
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				_patch_failed=1
			fi
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			;;
		esac
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	done

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	if ! [ -z "$_patch_failed" ]; then
		error "The following patches failed:"
		cat failed
		return 1
	fi

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	# remove localversion from patch if any
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	rm -f localversion*
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	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
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}

build() {
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	for i in $_flavors; do
		cd "$srcdir"/build-$i
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		make CC="${CC:-gcc}" \
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			KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine" \
			|| return 1
	done
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}
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_package() {
	local _buildflavor="$1" _outdir="$2"
	local _abi_release=${pkgver}-${pkgrel}-${_buildflavor}
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	cd "$srcdir"/build-$_buildflavor || return 1

	mkdir -p "$_outdir"/boot "$_outdir"/lib/modules
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	local _install
	case "$CARCH" in
	arm*)
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		local _dtbdir="$_outdir"/usr/lib/linux-${_abi_release}
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		mkdir -p "$_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 $_install \
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		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_PATH="$_outdir"/boot \
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		|| return 1
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	rm -f "$_outdir"/lib/modules/${_abi_release}/build \
		"$_outdir"/lib/modules/${_abi_release}/source
	rm -rf "$_outdir"/lib/firmware
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	install -D include/config/kernel.release \
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		"$_outdir"/usr/share/kernel/$_buildflavor/kernel.release
}

# main flavor installs in $pkgdir
package() {
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	depends="$depends linux-firmware"
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	_package grsec "$pkgdir"
}

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

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_dev() {
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	local _flavor=$(echo $subpkgname | sed -E 's/(^linux-|-dev$)//g')
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	local _abi_release=${pkgver}-${pkgrel}-$_flavor
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	# 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
	#
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	# this way you dont need to install the 300-400 kernel sources to
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	# build a tiny kernel module
	#
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	pkgdesc="Headers and script for third party modules for $_flavor kernel"
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	depends="gmp-dev bash"
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	local dir="$subpkgdir"/usr/src/linux-headers-${_abi_release}
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	# first we import config, run prepare to set up for building
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	# external modules, and create the scripts
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	mkdir -p "$dir"
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	cp "$srcdir"/config-$_flavor.${CARCH} "$dir"/.config
	echo "-$pkgrel-$_flavor" > "$dir"/localversion-alpine \
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		|| return 1
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	make -j1 -C "$srcdir"/linux-$_kernver O="$dir" HOSTCC="${CC:-gcc}" \
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		silentoldconfig prepare modules_prepare scripts
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	# remove the stuff that poits to real sources. we want 3rd party
	# modules to believe this is the soruces
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	rm "$dir"/Makefile "$dir"/source

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	# copy the needed stuff from real sources
	#
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	# this is taken from ubuntu kernel build script
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	# http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-jaunty.git;a=blob;f=debian/rules.d/3-binary-indep.mk;hb=HEAD
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	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"
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	install -Dm644 "$srcdir"/build-$_flavor/Module.symvers \
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		"$dir"/Module.symvers
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	mkdir -p "$subpkgdir"/lib/modules/${_abi_release}
	ln -sf /usr/src/linux-headers-${_abi_release} \
		"$subpkgdir"/lib/modules/${_abi_release}/build
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}

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md5sums="9a78fa2eb6c68ca5a40ed5af08142599  linux-4.4.tar.xz
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8c83b4bc6b233bd87d8f75e92086583d  patch-4.4.45.xz
8920b650a456104174f522f0814f5f17  grsecurity-3.1-4.4.45-201604252206-alpine.patch
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c32f1d7517a095a2645fc1c7dec5db8f  fix-spi-nor-namespace-clash.patch
b11c29ee88f7f537973191036d48bee7  imx6q-no-unclocked-sleep.patch
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90e0fca6cb7bca277394b0db7f605098  gcc6.patch
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0220ccde4e102bd54ad334a23347a432  config-grsec.x86
e1b185c3baea29a66dfa8f90967c1120  config-grsec.x86_64
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35d10d9444978dc8009e9da5e33b0f43  config-grsec.armhf
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9b89c4ec614023e20f8e905ec2bad212  config-virtgrsec.x86
87243f2790108ca568192169d3ca7408  config-virtgrsec.x86_64"
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sha256sums="401d7c8fef594999a460d10c72c5a94e9c2e1022f16795ec51746b0d165418b2  linux-4.4.tar.xz
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8d359628e1b6918308998510f6f5724b7f5f27016bcaee3760f4ad1f4a8a93fb  patch-4.4.45.xz
7e765be5c0e747369a67adb6ea90808ff87ad860ac07167422875e6173eb06c6  grsecurity-3.1-4.4.45-201604252206-alpine.patch
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b8ce28c61663dbd92f7e1c862c042c88c4d0459ce15f6e6ea121e20705b66212  fix-spi-nor-namespace-clash.patch
7e8a954750139a421a76e414e19a3b57645c9ec70e6c14a6b7708a3fa0cfd5e4  imx6q-no-unclocked-sleep.patch
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21640b417cb9a389bf7be6a11dc71a481ec76fcfcc758992a9be158ab6a643e8  gcc6.patch
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8ca6e71c3b0e0013a05dd95655de733f533055bdcdaade52667789c578b9bebc  config-grsec.x86
588fb21febe695a7724ec00cb1576913cdb5ad12e12d00b3a0f73342c46cfe0c  config-grsec.x86_64
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d975df937d5a82b48bba790bd50bf7ed04782d92755a6eeacedc9e2796633e7a  config-grsec.armhf
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09e5db637018516a2216c9a45a47a471af69fdf94218e6ea016ec8261cd899d3  config-virtgrsec.x86
7b38853b6d83223242832413669d7818ef1218c6b9e565e11dcc8b08f64a26e3  config-virtgrsec.x86_64"
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sha512sums="13c8459933a8b80608e226a1398e3d1848352ace84bcfb7e6a4a33cb230bbe1ab719d4b58e067283df91ce5311be6d2d595fc8c19e2ae6ecc652499415614b3e  linux-4.4.tar.xz
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37c8fb23b9456e67f515ac3baf03a5eecd1fcbf534d222564579ba47db19c2ccff92275fc977279c49d1e8df3c7e51e64552446f1789cd08c7d994b8367bfe2b  patch-4.4.45.xz
87219cee934ababb5dcbfd6bdf71d4b53778305ab3bd4bd76d433603ec0a12d73c536aee2892b9adf0ae39ec7bcceb7d9f9a64bfbc854825f427561a4061d392  grsecurity-3.1-4.4.45-201604252206-alpine.patch
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410fe7dae27cb4998d17a441a5b2a19dd350636ead2de97d4ef5317501d9e82e2550bfca0f022c9be6296907c076c381e1e13060d1900ff26ee7d47f234fb104  fix-spi-nor-namespace-clash.patch
9980eb10f529bc5ce482ab0a0037febbc982b528c3e4d02fc4547e6dd45dc529a7b1711d0c89f942b1ae27842c3794b68a6b8959ef80f6fd00183d3a591cea07  imx6q-no-unclocked-sleep.patch
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8c92f68afcf483ce203c8117d9459c3db0363a69b2112a2f1b67474532250d1ec9350aab555e69794709a045f8bf121ded9441f0cffc018b5a38746f9b908eee  config-virtgrsec.x86
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