# Kernel config based on: arch/arm64/configs/defconfig
# APKBUILD based on linux-postmarketos-mainline
# See: https://gitlab.com/postmarketOS/pmaports/issues/153

_flavor=google-crosshatch-mainline
_config="config-$_flavor.$CARCH"

pkgname=linux-$_flavor

pkgver=5.3_rc5
_pkgver=${pkgver/_/-}
_kernver=${pkgver%_rc*}
_mainver=${_kernver%.*}
_patchlevel=${_kernver/$_mainver./}
_basever=$_mainver.$((_patchlevel-1))
pkgrel=4

arch="aarch64"
pkgdesc="Google Pixel 3 XL kernel fork, close to mainline"
url="https://kernel.org/"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev openssl-dev file bison flex"
options="!strip !check !tracedeps pmb:cross-native"

_repository="linux"
_commit="9c9b87cec239101274451cc9c086da60108f9fda"

source="
	$pkgname-$_commit.tar.gz::https://github.com/Pixel3Dev/$_repository/archive/$_commit.tar.gz
	config-$_flavor.aarch64
	linux4.17-gcc10-extern_YYLOC_global_declaration.patch
"

subpackages="$pkgname-dev"

license="GPL2"
_abi_release=$_pkgver
_carch=$CARCH
case "$_carch" in
aarch64*) _carch="arm64" ;;
arm*) _carch="arm" ;;
ppc*) _carch="powerpc" ;;
s390*) _carch="s390" ;;
esac

builddir="$srcdir/linux-$_commit"

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

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

	mkdir -p "$srcdir"/build
	cp -v "$srcdir"/$_config "$srcdir"/build/.config
	make -C "$builddir" O="$srcdir"/build ARCH="$_carch" \
		olddefconfig
}

build() {
	cd "$srcdir"/build
	unset LDFLAGS
	make ARCH="$_carch" CC="${CC:-gcc}" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-$_flavor" \
		CFLAGS_MODULE=-fno-pic
}

package() {
	cd "$srcdir/build/arch/$_carch/boot"

	if [ "$CARCH" == "aarch64" ]; then
		install -Dm644 "$srcdir/build/arch/$_carch/boot/Image.gz" \
			"$pkgdir/boot/vmlinuz"
	else
		install -Dm644 "$srcdir/build/arch/$_carch/boot/"*zImage \
			"$pkgdir/boot/vmlinuz"
	fi

	install -D "$srcdir/build/include/config/kernel.release" \
		"$pkgdir/usr/share/kernel/$_flavor/kernel.release"

	cd "$srcdir"/build

	local _install
	case "$CARCH" in
	aarch64*|arm*)	_install="modules_install dtbs_install" ;;
	*)		_install="modules_install" ;;
	esac

	make -j1 $_install \
		ARCH="$_carch" \
		INSTALL_MOD_PATH="$pkgdir" \
		INSTALL_DTBS_PATH="$pkgdir/boot/dtbs"
}


dev() {
	# copy the only the parts that we really need for build 3rd party
	# kernel modules and install those as /usr/src/linux-headers,
	# similar to what ubuntu does
	#
	# this way you don't need to install the 300-400 kernel sources to
	# build a tiny kernel module
	#
	pkgdesc="Headers and script for third party modules for postmarketos kernel"
	depends="gmp-dev bash perl"
	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"/$_config "$dir"/.config
	make -j1 -C "$builddir" O="$dir" ARCH="$_carch" \
		olddefconfig prepare modules_prepare scripts

	# needed for 3rd party modules
	# https://bugzilla.kernel.org/show_bug.cgi?id=11143
	case "$CARCH" in
	ppc*) (cd "$dir" && make arch/powerpc/lib/crtsavres.o);;
	esac

	# remove the stuff that points to real sources. we want 3rd party
	# modules to believe this is the sources
	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 "$builddir"
	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 "$dir"
	cp -a scripts include "$dir"
	find $(find arch -name include -type d -print) -type f \
		| cpio -pdm "$dir"

	install -Dm644 "$srcdir"/build/Module.symvers \
		"$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="1ce235689d7ce0b40be203cb16c1bdfe9bc7b2c5e793a942afc5ea4f3268a0a15b684d9c4017a87916d989d8592a96a4223976c95bf7fcca603e71d2f20fee86  linux-google-crosshatch-mainline-9c9b87cec239101274451cc9c086da60108f9fda.tar.gz
63f7e39aaba78f144ad65b8257e559049cbb827d015c1a9002e5f12a24ae4126fc8dee6256ba56ba557d6f51d8522cf19460c2fcb7879c39a399ebe94c3ca551  config-google-crosshatch-mainline.aarch64
27827877040007fc1c4c719f7e2e19e5c272d44972415cfc53feba0313d87e4074f8204bdb13cbc5fe21ea61bf595314b68f10c081e7b7bac3c888b60f008acf  linux4.17-gcc10-extern_YYLOC_global_declaration.patch"
