# Maintainer: John Vogel <jvogel@stygian.me>
maintainer="John Vogel <jvogel@stygian.me>"
_flavor=dragon
pkgname=linux-$_flavor
pkgver=7.0.11
_kernver=${pkgver%.*}
pkgrel=0
pkgdesc="Linux mainline (development kernel for Radxa Dragon Q6A"
url="https://www.kernel.org"
depends="initramfs-generator"
_depends_dev="perl gmp-dev mpc1-dev mpfr-dev elfutils-dev bash flex bison zstd"
makedepends="$_depends_dev
	bc
	bpftool
	diffutils
	elfutils
	findutils
	gcc>=13.1.1_git20230624
	grep
	installkernel
	linux-firmware-qcom
	linux-firmware-realtek
	linux-firmware-rtl_nic
	linux-headers
	mawk
	openssl-dev>3
	pahole
	python3
	sed
	zstd
	"
options="!strip !check"
source="https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz
	https://stygian.me/distfiles/dragon-$pkgver-alpine.patch
	0001-arm64-dts-qcom-kodiak-avoid-EFI-overlap-for-ADSP-rem.patch
	0001-powerpc-boot-wrapper-Add-z-notext-flag-for-ppc64le.patch
	0002-x86-Compress-vmlinux-with-zstd-19-instead-of-22.patch
	0003-kexec-add-kexec_load_disabled-boot-option.patch
	0004-objtool-respect-AWK-setting.patch
	0005-powerpc-config-defang-gcc-check-for-stack-protector-.patch
	tools-headers.patch

	dragon.aarch64.config
	"
subpackages="$pkgname-dev:_dev:$CBUILD_ARCH $pkgname-doc"
for _i in $source; do
	case $_i in
	*.$CARCH.config)
		_f=${_i%."$CARCH".config}
		_flavors="$_flavors $_f"
		if [ "linux-$_f" != "$pkgname" ]; then
			subpackages="$subpackages linux-$_f::$CBUILD_ARCH linux-$_f-dev:_dev:$CBUILD_ARCH"
		fi
		;;
	esac
done
builddir="$srcdir"/linux-"$_kernver"

if [ "${pkgver%.0}" = "$pkgver" ]; then
	# Prepend to apply first
	source="patch-$pkgver.patch.xz::https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/patch-$pkgver.xz $source"
fi
arch="aarch64"
license="GPL-2.0-only"

prepare() {
	default_prepare

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

_kernelarch() {
	local arch="$1"
	case "$arch" in
		aarch64*) arch="arm64" ;;
		*) arch="" ;;
	esac
	echo "$arch"
}

_prepareconfig() {
	local _flavor="$1"
	local _arch="$2"
	local _config=$_flavor.$_arch.config
	local _builddir="$srcdir"/build-$_flavor.$_arch
	mkdir -p "$_builddir"
	echo "-$pkgrel-$_flavor" > "$_builddir"/localversion-alpine

	cp "$srcdir"/$_config "$_builddir"/.config
	msg "Configuring $_flavor kernel ($_arch)"
	make -C "$builddir" \
		O="$_builddir" \
		ARCH="$(_kernelarch $_arch)" \
		olddefconfig

	if grep "CONFIG_MODULE_SIG=y" "$_builddir"/.config >/dev/null; then
		if [ -f "$KERNEL_SIGNING_KEY" ]; then
			sed -i -e "s:^CONFIG_MODULE_SIG_KEY=.*:CONFIG_MODULE_SIG_KEY=\"$KERNEL_SIGNING_KEY\":" \
				"$_builddir"/.config
			msg "Using $KERNEL_SIGNING_KEY to sign $_flavor kernel ($_arch) modules"
		else
			warning "KERNEL_SIGNING_KEY was not set. A signing key will be generated, but 3rd"
			warning "party modules can not be signed"
		fi
	fi
}

listconfigs() {
	for i in $source; do
		case "$i" in
			*.config) echo $i;;
		esac
	done
}

prepareconfigs() {
	for _config in $(listconfigs); do
		local _flavor=${_config%%.*}
		local _arch=${_config%.config}
		_arch=${_arch#*.}
		local _builddir="$srcdir"/build-$_flavor.$_arch
		_prepareconfig "$_flavor" "$_arch"
	done
}

# this is supposed to be run before version is bumped so we can compare
# what new kernel config knobs are introduced
prepareupdate() {
	clean && fetch && unpack && prepare && deps
	prepareconfigs
	rm -r "$builddir"
}

updateconfigs() {
	if ! [ -d "$builddir" ]; then
		deps && fetch && unpack && prepare
	fi
	for _config in ${CONFIGS:-$(listconfigs)}; do
		msg "updating $_config"
		local _flavor=${_config%%.*}
		local _arch=${_config%.config}
		_arch=${_arch#*.}
		local _builddir="$srcdir"/build-$_flavor.$_arch
		mkdir -p "$_builddir"
		echo "-$pkgrel-$_flavor" > "$_builddir"/localversion-alpine
		local actions="listnewconfig oldconfig"
		if ! [ -f "$_builddir"/.config ]; then
			cp "$srcdir"/$_config "$_builddir"/.config
			actions="olddefconfig"
		fi
		env | grep ^CONFIG_ >> "$_builddir"/.config || true
		make -j1 -C "$builddir" \
			O="$_builddir" \
			ARCH="$(_kernelarch $_arch)" \
			$actions savedefconfig

		cp "$_builddir"/defconfig "$startdir"/$_config
	done
}

set_kbuild_timestamp() {
	# KBUILD_BUILD_TIMESTAMP needs to be parsable by busybox date
	export KBUILD_BUILD_TIMESTAMP="$(date '+%Y-%m-%d %H:%M:%S' -u${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"
}

build() {
	unset LDFLAGS
	# for some reason these sometimes leak into the kernel build,
	# -Werror=format-security breaks some stuff
	unset CFLAGS CPPFLAGS CXXFLAGS
	set_kbuild_timestamp
	for i in $_flavors; do
		_prepareconfig "$i" "$CARCH"
	done
	for i in $_flavors; do
		msg "Building $i kernel"
		cd "$srcdir"/build-$i.$CARCH

		# set org in cert for modules signing
		# https://www.kernel.org/doc/html/v6.1/admin-guide/module-signing.html#generating-signing-keys
		mkdir -p certs
		sed -e 's/#O = Unspecified company/O = alpinelinux.org/' \
			"$builddir"/certs/default_x509.genkey \
			> certs/x509.genkey

		make ARCH="$(_kernelarch $CARCH)" \
			CC="${CC:-gcc}" \
			AWK="${AWK:-mawk}" \
			KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine"

		if grep -q '^CONFIG_DEBUG_INFO_BTF=y' .config; then
			# Generate vmlinux.h
			bpftool btf dump file vmlinux format c > vmlinux.h

			if [ "$CARCH" = "ppc64le" ]; then
				# ppc64le installs the uncompressed vmlinux, which is extremely
				# large with BTF debuginfo unless stripped
				eu-strip --remove-comment vmlinux
			fi
		fi
	done
}

_package() {
	local _buildflavor="$1" _outdir="$2"
	set_kbuild_timestamp

	cd "$srcdir"/build-$_buildflavor.$CARCH
	local _abi_release="$(make -s kernelrelease)"
	# modules_install seems to regenerate a defect Modules.symvers on s390x. Work
	# around it by backing it up and restore it after modules_install
	cp Module.symvers Module.symvers.backup

	mkdir -p "$_outdir"/boot "$_outdir"/lib/modules

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

	make modules_install $_install \
		ARCH="$(_kernelarch $CARCH)" \
		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_MOD_STRIP=1 \
		INSTALL_PATH="$_outdir"/boot \
		INSTALL_DTBS_PATH="$_outdir/boot/dtbs-$_buildflavor"

	cp Module.symvers.backup Module.symvers

	rm -f "$_outdir"/lib/modules/"$_abi_release"/build \
		"$_outdir"/lib/modules/"$_abi_release"/source
	rm -rf "$_outdir"/lib/firmware

	install -D -m644 include/config/kernel.release \
		"$_outdir"/usr/share/kernel/$_buildflavor/kernel.release
}

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

	_package "$_flavor" "$pkgdir"

	# copy files for linux-stable-doc sub package
	mkdir -p "$pkgdir"/usr/share/doc
	cp -r "$builddir"/Documentation \
		"$pkgdir"/usr/share/doc/linux-stable-doc-"$pkgver"/
	# remove files that aren't part of the documentation itself
	for nondoc in .gitignore conf.py docutils.conf Kconfig Makefile; do
		rm "$pkgdir"/usr/share/doc/linux-stable-doc-"$pkgver"/"$nondoc"
	done
	# create /usr/share/doc/linux-stable-doc symlink
	cd "$pkgdir"/usr/share/doc; ln -s linux-stable-doc-"$pkgver" linux-stable-doc
}

_dev() {
	local _flavor=$(echo $subpkgname | sed -E 's/(^linux-|-dev$)//g')
	local _builddir="$srcdir"/build-$_flavor.$CARCH
	local _abi_release="$(make -C "$_builddir" -s kernelrelease)"
	local _karch="$(_kernelarch $CARCH | sed 's/x86_64/x86/')"
	# 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 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"
	set_kbuild_timestamp

	# first we import config, run prepare to set up for building
	# external modules, and create the scripts
	mkdir -p "$dir"
	cp -a "$_builddir"/.config "$_builddir"/localversion-alpine \
		"$dir"/

	install -D -t "$dir"/certs "$_builddir"/certs/signing_key.x509 || :

	# Install vmlinux.h
	if grep -q '^CONFIG_DEBUG_INFO_BTF=y' "$_builddir"/.config; then
		install -Dm644 "$_builddir"/vmlinux.h -t "$dir/"
	fi

	make -C "$builddir" \
		O="$dir" \
		ARCH="$(_kernelarch $CARCH)" \
		AWK="${AWK:-mawk}" \
		prepare modules_prepare scripts

	# 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 \
		\( -name 'Makefile*' -o -name 'Kconfig*' -o -name 'Kbuild*' -o \
		   -name '*.sh' -o -name '*.pl' -o -name '*.lds' -o -name 'Platform' \) \
		-print | cpio -pdm "$dir"

	cp -a scripts include "$dir"

	find "arch/$_karch" "tools/include" "tools/arch/$_karch" -type f -path '*/include/*' \
		-print | cpio -pdm "$dir"

	install -Dm644 "$srcdir"/build-$_flavor.$CARCH/Module.symvers \
		"$dir"/Module.symvers

	# remove unneeded things
	msg "Removing documentation..."
	rm -r "$dir"/Documentation
	sed -i -e '/Documentation/d' "$dir"/Kconfig
	find "$dir" -type f \( -name '*.o' -o -name '*.cmd' \) -exec rm -v -- {} +

	mkdir -p "$subpkgdir"/lib/modules/"$_abi_release"
	ln -sf /usr/src/linux-headers-"$_abi_release" \
		"$subpkgdir"/lib/modules/"$_abi_release"/build
}

sha512sums="
6e20f47171270b47774b1f62f96b81a498544894ccc3c027785c0aec6751ad7b55dc96bc0fcdc52ea7cad57a1501fc651d024a2ac51383e3d753b0dcaeafb76d  patch-7.0.11.patch.xz
8c85b708342f8f09ca25b2234b22e93b62b144a9ef919fbb21827f52fa47498e778c79db1559524dd7fb360f95b2ce174171443c1859656c281be41d2b6c5a0b  linux-7.0.tar.xz
73b5860e4bec31a2c81c768fd4c00c198d48f7ef4b13bc78a98a95ab3e5ef3b5d95f1dfc8fd0be22f088b8b864f153d3a6e185969ef89d58f920ef262c992e3d  dragon-7.0.11-alpine.patch
fe4716f94a10fba23504d1439e52630b68ab92f3c0943378540a1d3c8549039b78949a3345e60fc487b605f33ca5db9440101a07052e5771545b045d99e3c9be  0001-arm64-dts-qcom-kodiak-avoid-EFI-overlap-for-ADSP-rem.patch
ce735e313a409147e51c429512bc94515f3e8bf23c19cccf2ef2d65c42587ead9a4657ba6dd63934929e3c83680d930b4ef4fb1511db6080286929f84329ebc0  0001-powerpc-boot-wrapper-Add-z-notext-flag-for-ppc64le.patch
25ff1b351d1aeb2a892260a90e6ba2179b217e7f961e397a5a6e91621aef8c41ef9e952d351502a12f96aea6f5ebf3a846478dd3d615ac3b31448e06b6ad24e2  0002-x86-Compress-vmlinux-with-zstd-19-instead-of-22.patch
7651ef4f896e2da3a6c002b04b42ada27809efd10eb4a15dace6e9ef2e67c69135f30d2ff2f29854749d57e383b6c45c9ad16f0e53b3e03a7ef93e760f591b1c  0003-kexec-add-kexec_load_disabled-boot-option.patch
3ee2ede7354e8f37cab474f06d90dc70aad4ab6b51de68782018a3a93835c608daf4d97151376bb8d7054ea43bb675ef26a4750f9c2a9d562ef3ef55718fa197  0004-objtool-respect-AWK-setting.patch
a2170a58f5bc7eba7591f28d2329077027f276e84c2bb2af875cd787d0f37ef17f348d28bc9e1ede6154030283b2c9759e53bf6f3fc7dcd6f112b2c426cc184d  0005-powerpc-config-defang-gcc-check-for-stack-protector-.patch
fc6c32491ef1388a0efc8f499c776042c9596f4137e452ccd1c6435323cbb4c47fa0c1a632ee022b3cd1ca4797ef0917aa93369004c846ba1b68aa9492741074  tools-headers.patch
1cb18f3d44a4c688595e4e0b2a5e4c6b98e51f62d5e3cc099b8f3f20fd45ae0845fc14740336fc1f078491bc44ff587ddfacd631582657d1a735092073ce6f60  dragon.aarch64.config
"