# Contributor: Milan P. Stanić <mps@arvanta.net>
# Maintainer: Milan P. Stanić <mps@arvanta.net>

_flavor=edge
pkgname=linux-$_flavor
# NOTE: this kernel is intended for testing
# please resist urge to upgrade it blindly
pkgver=6.15.0
_kernver=${pkgver%.*}
pkgrel=0
pkgdesc="Linux latest stable kernel"
url="https://www.kernel.org"
depends="initramfs-generator"
_depends_dev="perl gmp-dev elfutils-dev flex bison"
makedepends="$_depends_dev
	bc
	diffutils
	findutils
	hexdump
	installkernel
	linux-headers
	linux-firmware-any
	openssl-dev
	python3
	sed
	xz"

options="!strip !check" # no tests
_config=${config:-config-edge.$CARCH}

subpackages="$pkgname-dev:_dev:$CBUILD_ARCH $pkgname-doc:_doc"
source="https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz"
case $pkgver in
	*.*.0)	;;
	*.*.*)	source="
		patch-$pkgver.patch.xz::https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/patch-$pkgver.xz
		$source" ;;
esac

source="$source
	config-edge.aarch64
	config-edge.armv7
	config-edge.loongarch64
	config-edge.x86_64
	config-edge.riscv64
	"

builddir="$srcdir/linux-$_kernver"
arch="armv7 aarch64 loongarch64 x86_64 riscv64"
license="GPL-2.0-only"

_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

_carch=$CARCH
case "$_carch" in
aarch64*) _carch="arm64" ;;
arm*) _carch="arm" ;;
riscv64) _carch="riscv" ;;
loongarch64) _carch="loongarch" ;;
esac

prepare() {
	default_prepare

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

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

		install -m644 "$srcdir"/$_config "$builddir"/.config
		make -C $builddir \
			O="$builddir" \
			ARCH="$_carch" \
			listnewconfig oldconfig
	done
}

build() {
	unset LDFLAGS
	export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"
	for i in $_flavors; do
		make ARCH="$_carch" DTC_FLAGS="-@" CC="${CC:-gcc}" \
			KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine"
	done
}

_package() {
	local _buildflavor="$1" _outdir="$2"
	local _abi_release=$pkgver-$pkgrel-$_buildflavor
	export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

	# 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) _install="zinstall dtbs_install";;
		riscv64) _install="install dtbs_install";;
		*) _install=install;;
	esac

	make -j1 modules_install $_install \
		ARCH="$_carch" \
		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_PATH="$_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

	case "$CARCH" in
	loongarch64)
		mv  "$_outdir"/boot/vmlinuz-$_abi_release \
			"$_outdir"/boot/vmlinuz-$_buildflavor

		mv  "$_outdir"/boot/config-$_abi_release \
			"$_outdir"/boot/config-$_buildflavor

		mv  "$_outdir"/boot/System.map-$_abi_release \
			"$_outdir"/boot/System.map-$_buildflavor
		;;
	esac
}

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

	_package edge "$pkgdir"
}

_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
	export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

	# first we import config, run prepare to set up for building
	# external modules, and create the scripts
	mkdir -p "$dir"
	install -m644 "$srcdir"/config-$_flavor.$CARCH "$dir"/.config
	echo "-$pkgrel-$_flavor" > "$dir"/localversion-alpine
	cd $builddir

	echo "Installing headers..."
	case "$_carch" in
	x86_64)
		_carch="x86"
		install -Dt "$dir/tools/objtool" tools/objtool/objtool
		;;
	esac
	cp -t "$dir" -a include

	install -Dt "$dir" -m644 Makefile
	install -Dt "$dir" -m644 Module.symvers
	install -Dt "$dir" -m644 System.map
	cp -t "$dir" -a scripts

	install -Dt "$dir/arch/$_carch" -m644 arch/$_carch/Makefile
	install -Dt "$dir/arch/$_carch/kernel" -m644 arch/$_carch/kernel/asm-offsets.s
	cp -t "$dir/arch/$_carch" -a arch/$_carch/include

	install -Dt "$dir/drivers/md" -m644 drivers/md/*.h
	install -Dt "$dir/net/mac80211" -m644 net/mac80211/*.h

	# https://bugs.archlinux.org/task/13146
	install -Dt "$dir/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h

	# https://bugs.archlinux.org/task/20402
	install -Dt "$dir/drivers/media/usb/dvb-usb" -m644 drivers/media/usb/dvb-usb/*.h
	install -Dt "$dir/drivers/media/dvb-frontends" -m644 drivers/media/dvb-frontends/*.h
	install -Dt "$dir/drivers/media/tuners" -m644 drivers/media/tuners/*.h

	# https://bugs.archlinux.org/task/71392
	install -Dt "$dir/drivers/iio/common/hid-sensors" -m644 drivers/iio/common/hid-sensors/*.h

	echo "Installing KConfig files..."
	find . -name 'Kconfig*' -exec install -Dm644 {} "$dir/{}" \;

	echo "Removing unneeded architectures..."
	local arch
	for arch in "$dir"/arch/*/; do
		case $(basename "$arch") in $_carch) continue ;; esac
		echo "Removing $(basename "$arch")"
		rm -r "$arch"
	done

	echo "Removing broken symlinks..."
	find -L "$builddir" -type l -printf 'Removing %P\n' -delete

	echo "Removing loose objects..."
	find "$builddir" -type f -name '*.o' -printf 'Removing %P\n' -delete

	echo "Stripping build tools..."
	local file
	while read -rd '' file; do
		case "$(file -bi "$file")" in
			application/x-sharedlib\;*)      # Libraries (.so)
				strip -v $STRIP_SHARED "$file" ;;
			application/x-archive\;*)        # Libraries (.a)
				strip -v $STRIP_STATIC "$file" ;;
			application/x-executable\;*)     # Binaries
				strip -v $STRIP_BINARIES "$file" ;;
			application/x-pie-executable\;*) # Relocatable binaries
				strip -v $STRIP_SHARED "$file" ;;
		esac
	done < <(find "$builddir" -type f -perm -u+x ! -name vmlinux -print0)

	echo "Stripping vmlinux..."
	strip -v $STRIP_STATIC "$builddir/vmlinux"

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

_doc() {
	pkgdesc="documentation for $_flavor kernel"
	depends=""
	mkdir -p "$subpkgdir"/usr/share/doc/linux-edge-doc
	cp -r "$builddir"/Documentation \
		"$subpkgdir"/usr/share/doc/linux-edge-doc/

}

sha512sums="
d03788ffa8d8ae1b84ef1286bb44a08fc01432e509dfec6cccae5c5a5a47201d378aec2bcd21e6f0bbd1e625b26f47780c06ee9c1cef3775358f98b160923f30  linux-6.15.tar.xz
8a02581b6f2c41fc73c1178901a250091fd321efac88390badee5bc480e95aa2a5efac00ef0c75335acbe9443248aaf39a636f15f812305ae523ecbb7c12b000  config-edge.aarch64
37a6205497e10a72e72f72ae60050d3df6b63b680640c5af18269cf2873e117981a58d87827514916eb2e4c04073fffe27172115ff977180a71243a7d40e7d62  config-edge.armv7
56259728fb7516aef6bb46594e579d3b5ce169bc05c78d7ce95f90cb396755e85bdd016a59c8e420b672b9e29660bb94def11ffc769ec67ce1d0b74b7634bb34  config-edge.loongarch64
552fc85794893a691e7949ffa070f37031c7ef7bba8012aececfac40213ed1ade1984ec3d40363612ed591fba0a726f155eabee7479c5ba914c3b5ef3379452d  config-edge.x86_64
4291a6ab7e078f191da80cba2758c92b818dd4f758e1c1c2dfe6a710c5c609f9c2bdd005a49febae0c790cddf1ce197108bdf656b3ace3a5ac0c0bb35805b37a  config-edge.riscv64
"
