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

_flavor=lts
pkgname=linux-$_flavor
pkgver=6.1.21
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=0
pkgdesc="Linux lts kernel"
url="https://www.kernel.org"
depends="initramfs-generator"
_depends_dev="perl gmp-dev mpc1-dev mpfr-dev elfutils-dev bash flex bison zstd"
makedepends="$_depends_dev sed installkernel bc linux-headers linux-firmware-any openssl-dev>3 mawk
	diffutils findutils zstd pahole python3"
options="!strip"
_config=${config:-config-lts.${CARCH}}
source="https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz
	0001-powerpc-config-defang-gcc-check-for-stack-protector-.patch
	0001-x86-Compress-vmlinux-with-zstd-19-instead-of-22.patch
	0001-kexec-add-kexec_load_disabled-boot-option.patch
	awk.patch
	ppc-notext.patch
	0001-tty-Move-sysctl-setup-into-core-tty-logic.patch
	0002-tty-Allow-TIOCSTI-to-be-disabled.patch
	0003-tty-Move-TIOCSTI-toggle-variable-before-kerndoc.patch

	lts.aarch64.config
	lts.armv7.config
	lts.x86.config
	lts.x86_64.config
	lts.ppc64le.config
	lts.s390x.config

	virt.aarch64.config
	virt.armv7.config
	virt.ppc64le.config
	virt.x86.config
	virt.x86_64.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
	source="$source
	https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/patch-$pkgver.xz"
fi
arch="all !armhf !riscv64"
license="GPL-2.0-only"

# secfixes:
#   5.10.4-r0:
#     - CVE-2020-29568
#     - CVE-2020-29569
#   5.15.74-r0:
#     - CVE-2022-41674
#     - CVE-2022-42719
#     - CVE-2022-42720
#     - CVE-2022-42721
#     - CVE-2022-42722

prepare() {
	if [ "$_kernver" != "$pkgver" ]; then
		msg "Applying patch-$pkgver.xz"
		unxz -c < "$srcdir"/patch-$pkgver.xz | patch -p1 -N
	fi

	default_prepare

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

_kernelarch() {
	local arch="$1"
	case "$arch" in
		aarch64*) arch="arm64" ;;
		arm*) arch="arm" ;;
		mips*) arch="mips" ;;
		ppc*) arch="powerpc" ;;
		s390*) arch="s390" ;;
	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 "$srcdir"/linux-$_kernver \
		O="$_builddir" \
		ARCH="$(_kernelarch $_arch)" \
		olddefconfig
}

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 "$srcdir"/linux-$_kernver
}

updateconfigs() {
	if ! [ -d "$srcdir"/linux-$_kernver ]; then
		deps && fetch && unpack && prepare
	fi
	for _config in $(listconfigs); do
		local _flavor=${_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 "$_builddir"/.config
			actions="olddefconfig"
			env | grep ^CONFIG_ >> "$_builddir"/.config || true
		fi
		make -j1 -C "$srcdir"/linux-$_kernver \
			O="$_builddir" \
			ARCH="$(_kernelarch $_arch)" \
			$actions savedefconfig

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

build() {
	unset LDFLAGS
	export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"
	for i in $_flavors; do
		_prepareconfig "$i" "$CARCH"
	done
	for i in $_flavors; do
		msg "Building $i kernel"
		cd "$srcdir"/build-$i.$CARCH
		make ARCH="$(_kernelarch $CARCH)" \
			CC="${CC:-gcc}" \
			AWK="${AWK:-mawk}" \
			KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine"
	done
}

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

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

	make -j1 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 lts "$pkgdir"

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

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

_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)"
	# 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 "$dir"
	cp -a "$_builddir"/.config "$_builddir"/localversion-alpine \
		"$dir"/

	make -j1 -C "$srcdir"/linux-$_kernver \
		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 "$srcdir"/linux-$_kernver
	find .  -path './include/*' -prune \
		-o -path './scripts/*' -prune -o -type f \
		\( -name 'Makefile*' -o -name 'Kconfig*' -o -name 'Kbuild*' -o \
		   -name '*.sh' -o -name '*.pl' -o -name '*.lds' -o -name 'Platform' \) \
		-print | cpio -pdm "$dir"

	cp -a scripts include "$dir"

	find arch -name include -type d -print | while IFS='' read -r folder; do
		find "$folder" -type f | cpio -pdm "$dir"
	done

	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="
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a6c826e8c3884550fbe1dee3771b201b3395b073369f7fbfb5dc4aa5501e848b0bbc3a5ad80d932a6a50cbe0cfd579c75662f0c43ef79a38c1c6848db395c4c8  0001-powerpc-config-defang-gcc-check-for-stack-protector-.patch
55f732c01e10948b283eb1cc77ce3f1169428251075f8f5dd3100d8fda1f08b6b3850969b84b42a52468d4f7c7ec7b49d01f0dff3c20c30f2e9ac0c07071b9d3  0001-x86-Compress-vmlinux-with-zstd-19-instead-of-22.patch
5464cf4b2e251972091cc9d5138291a94298737e98ec24829829203fc879593b440a7cd1ca08e6d01debaab2887976cb5d38fae2fbe5149cef1735d5d73bb086  0001-kexec-add-kexec_load_disabled-boot-option.patch
15fca2343b57dcab247c5ad86175ae638bace41a803984170a4aca4f3ec70edf6399ce5c6de82ae0dfabd3430a7a7567941718806b6d5d56515ecc7d55b2a800  awk.patch
c74488940244ba032e741c370767467cfab93b89077b5dfccfed39b658f381e0995527e6c61de53b1c112b04ba647bfccf00f2e05c0637d3c703680a508821cc  ppc-notext.patch
f8582538a8482656138a0ae56b67a6d3cec09ff8d82a3f790ffa3fa7c37d0ae24a04f01f0ae1aec09838f86490907995c2568be7841a3821f0e64704f60153e5  0001-tty-Move-sysctl-setup-into-core-tty-logic.patch
0bfd2c138e997f25f821cd518263ad515fc303bbde37bcdb7dd651d30316c77652fec6fedb195102b8476b92b1e7269c143dad5df6431db49c4318375ad2e802  0002-tty-Allow-TIOCSTI-to-be-disabled.patch
8b245ec672a56dae7ce82f488880f6f3c0b65776177db663a29f26de752bf2cefe6b677e2cedbebd85e98d6f6e3d66b9f198a0d7a6042a20191b5ca8f4a749e7  0003-tty-Move-TIOCSTI-toggle-variable-before-kerndoc.patch
8499d68e567c35f733c01bc35340d4babb43700d42c2d3f84f4d234aa78c10ddcaec33533c13614cc12eb20d974fc91a52c52cfffb5b75d6efe0b2d5f7a31293  lts.aarch64.config
becd5c8ec55da666c013a1548a7aae7009ee18fef767cb878ea0480251d62522b49fb7fb75451adfbb6d06e244c32de5bfb2af88db6d545a40ee165ba4ed8a47  lts.armv7.config
8e2271e6198864ac039877b420a69a4bfa3a7ec8213cfa8ff6796180732fdb582cfcd5a05908344c5e5b9e6ab61b2962274f336810c1d2f126f0c2d2d9a0824a  lts.x86.config
3feab39771808bb421fab9d238257c6fd45bc45150075c592bf83ce4900e87221db12700423998c570f1b93cf7390490842e41ab243b6136426662316233a611  lts.x86_64.config
2c484ef587fcc68a48572ccb17b73353a40bf000d579ae2945b3ae298e88d97797305aa87a6bb6f58d3ee22bf99746eb5853f811c1b5a14b7b2824f1024f29dd  lts.ppc64le.config
51ce99e899d5ec8bb6bbd894dae27c409d0c7f532e2f9556cfc42957fd4487f6776d25e261e6ce2e7da784a668db2574d59840fc39de04e99f15c39ad870eb36  lts.s390x.config
2fa0ed20c5374b0fe8122795f2fa67ad9905ce245ecc043315cf76013c4ec1fd96350bafd9c6b0bd28963e3a47035f31e36df67a4286555f661ed539409e7d74  virt.aarch64.config
88a4f7146ed9444befe2c8813658ad6f19d2deaacdc5d74d794c6a8d7931496b593af206a69676bf21c018e26de2b844edef67da11c70adac23ced36ec108d9d  virt.armv7.config
6d165244130b33a5a0fe302117a930c743bd4b2c31bb900c39128dc72973d989579343cb6d48fd0fae4d63379a5d82051bf66edecb5a3dbc1484e519b8cdf137  virt.ppc64le.config
978a3f9b1005de7ef45f2b67316ad63ff539b4e8bd7fdad550dfcc46cf2e99b2b7c0a523578078f3fcf05e5f2e566b743acb3194408d79b75d663f8d9ea21f14  virt.x86.config
a92b01eb06360c8f4d5c993ebd611336d351eeabeb7f944fffc9636ce43f509882d811b7984b0c728fb5db6d78f8bc7bebc8f8009ebcf731cafafd65d7e3682d  virt.x86_64.config
d30131ff594cc029068722c6bf82e59fbe923e240c50e9916f41d58f25adc9d23cbcfabaf9078328dd1047e93b0c5a4dbe9b15efa87a3d29a90defab69a04eb5  patch-6.1.21.xz
"