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

_flavor=vanilla
pkgname=linux-${_flavor}
pkgver=4.19.67
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=0
pkgdesc="Linux vanilla kernel"
url="http://kernel.org"
depends="mkinitfs"
_depends_dev="perl gmp-dev elfutils-dev bash flex bison"
makedepends="$_depends_dev sed installkernel bc linux-headers linux-firmware openssl-dev"
options="!strip"
_config=${config:-config-vanilla.${CARCH}}
install=
source="https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz
	config-vanilla.aarch64
	config-vanilla.armhf
	config-vanilla.armv7
	config-vanilla.x86
	config-vanilla.x86_64
	config-vanilla.ppc64le
	config-vanilla.s390x

	config-virt.aarch64
	config-virt.x86
	config-virt.x86_64
	"
subpackages="$pkgname-dev:_dev:$CBUILD_ARCH"
_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-${_f}::$CBUILD_ARCH linux-${_f}-dev:_dev:$CBUILD_ARCH"
		fi
		;;
	esac
done

if [ "${pkgver%.0}" = "$pkgver" ]; then
	source="$source
	https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/patch-$pkgver.xz"
fi
arch="all"
license="GPL-2.0"

_carch=${CARCH}
case "$_carch" in
aarch64*) _carch="arm64" ;;
arm*) _carch="arm" ;;
mips*) _carch="mips" ;;
ppc*) _carch="powerpc" ;;
s390*) _carch="s390" ;;
esac

HOSTCC="${CC:-gcc}"
HOSTCC="${HOSTCC#${CROSS_COMPILE}}"

prepare() {
	local _patch_failed=
	cd "$srcdir"/linux-$_kernver
	if [ "$_kernver" != "$pkgver" ]; then
		msg "Applying patch-$pkgver.xz"
		unxz -c < "$srcdir"/patch-$pkgver.xz | patch -p1 -N
	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*
	oldconfig
}

oldconfig() {
	for i in $_flavors; do
		local _config=config-$i.${CARCH}
		local _builddir="$srcdir"/build-$i.$CARCH
		mkdir -p "$_builddir"
		echo "-$pkgrel-$i" > "$_builddir"/localversion-alpine \
			|| return 1

		cp "$srcdir"/$_config "$_builddir"/.config
		make -C "$srcdir"/linux-$_kernver \
			O="$_builddir" \
			ARCH="$_carch" HOSTCC="$HOSTCC" \
			listnewconfig oldconfig
	done
}

build() {
	unset LDFLAGS
	for i in $_flavors; do
		cd "$srcdir"/build-$i.$CARCH
		make ARCH="$_carch" CC="${CC:-gcc}" \
			KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine"
	done
}

_package() {
	local _buildflavor="$1" _outdir="$2"
	local _abi_release=${pkgver}-${pkgrel}-${_buildflavor}

	cd "$srcdir"/build-$_buildflavor.$CARCH

	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 $_install \
		ARCH="$_carch" \
		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-any"

	_package vanilla "$pkgdir"
}

# subflavors install in $subpkgdir
virt() {
	_package virt "$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 $_flavor kernel"
	depends="$_depends_dev"
	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="$dir" ARCH="$_carch" HOSTCC="$HOSTCC" \
		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.$CARCH/Module.symvers \
		"$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="ab67cc746b375a8b135e8b23e35e1d6787930d19b3c26b2679787d62951cbdbc3bb66f8ededeb9b890e5008b2459397f9018f1a6772fdef67780b06a4cb9f6f4  linux-4.19.tar.xz
68e1b7548364becbae69418c55e265a05f78c5173e1c6d640e74c8af29a028a0d0f054483adba645d611ff97517ea14a6af840b7e69ec0719b00af1503a9646a  config-vanilla.aarch64
2396809cc53cabc5546ea4d3294347a43a9bdb5682f91a943d52bb268360a29394c56300182a361a8d35a48a86315be5f8d4518b85b6b842f3a130bf68b7bbb1  config-vanilla.armhf
2396809cc53cabc5546ea4d3294347a43a9bdb5682f91a943d52bb268360a29394c56300182a361a8d35a48a86315be5f8d4518b85b6b842f3a130bf68b7bbb1  config-vanilla.armv7
525ad36c6f0db0660814ccdcb5ded28702e594dd38ed2ba176ac2288ef3d9076eca4ad2290560a0a6a317f1f886fd71096394c081358f533eb03dc79da58ae33  config-vanilla.x86
e5a5f1db295867c8289b5cb958b801b4220288e130536efa5515dfa956225055cbb8028f8b3e56e590fb80d7295dbbf63243842ca172d0485d5c2fe449a92244  config-vanilla.x86_64
37b7a375839693753f4d75c0d410f6314c646a1da2b168d9a3db8e3767e62b44676fd4ee2cd599b703bad9e73ced64591e8ac5edafc811b2585f3a49575d50f7  config-vanilla.ppc64le
4af65bf72b5eeff1dd00163eff286ace6af1c6aaf2760a8933669bde07411c7eae6d2988a4c4ad8f9bc97ed43fa4ca33a9bc3f9dd57e38c9f2bc070158b956af  config-vanilla.s390x
6befbc3fc9d5302cf3dc63a584a4d2f49e7428ef967ffb550bd3138cb1a1e46a24c7ef917cd8b341b4fb6a930b2998b70bee424a9b370a227bcfae26796c32c7  config-virt.aarch64
1eed7436148fc9d0afd4b4ccc15a6dca8288fe09f082758c0dde688d310c3c553fa7ea9f0c853e0a5815f103a4de2840bef81a32200b2d072df8cf1694ed9750  config-virt.x86
c268a2365bc8b907b2f5c726ebb61c01ed0d8718be5c3fe97f39239143557698420b3eca682e39c3fe3e9431784dfde37d15482a5999b159c0915d4cc11cb8a9  config-virt.x86_64
a73ea67811cdb6c7b86a249f21252e76af5926b50df7cd7a3b418b49a24afd5c66e69394cd0152dcbd8837c1271af485b794953d18595c936d4d62ac54442107  patch-4.19.67.xz"