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

_flavor=lts
pkgname=linux-${_flavor}
pkgver=5.4.31
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=0
pkgdesc="Linux lts kernel"
url="https://www.kernel.org"
depends="mkinitfs"
_depends_dev="perl gmp-dev elfutils-dev bash flex bison"
makedepends="$_depends_dev sed installkernel bc linux-headers linux-firmware-any openssl-dev
	diffutils"
options="!strip"
_config=${config:-config-lts.${CARCH}}
install=
source="https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz
	0002-powerpc-config-defang-gcc-check-for-stack-protector-.patch

	config-lts.aarch64
	config-lts.armv7
	config-lts.x86
	config-lts.x86_64
	config-lts.ppc64le
	config-lts.s390x
	config-lts.mips64
	config-lts.mips

	config-virt.aarch64
	config-virt.armv7
	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 !armhf"
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

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" \
			listnewconfig oldconfig
	done
}

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

	cd "$srcdir"/build-$_buildflavor.$CARCH
	# 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 $_install \
		ARCH="$_carch" \
		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_PATH="$_outdir"/boot \
		INSTALL_DTBS_PATH="$_outdir/boot/dtbs-$_flavor"

	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 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"
}

# 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}
	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 "$dir"
	cp "$srcdir"/config-$_flavor.${CARCH} "$dir"/.config
	echo "-$pkgrel-$_flavor" > "$dir"/localversion-alpine

	make -j1 -C "$srcdir"/linux-$_kernver O="$dir" ARCH="$_carch" \
		syncconfig 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 \
		\( -name 'Makefile*' -o -name 'Kconfig*' -o -name 'Kbuild*' -o \
		   -name '*.sh' -o -name '*.pl' -o -name '*.lds' -o -name 'Platform' \) \
		-print | cpio -pdm "$dir"

	cp -a scripts include "$dir"

	find $(find arch -name include -type d -print) -type f \
		| cpio -pdm "$dir"

	install -Dm644 "$srcdir"/build-$_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="9f60f77e8ab972b9438ac648bed17551c8491d6585a5e85f694b2eaa4c623fbc61eb18419b2656b6795eac5deec0edaa04547fc6723fbda52256bd7f3486898f  linux-5.4.tar.xz
d19365fe94431008768c96a2c88955652f70b6df6677457ee55ee95246a64fdd2c6fed9b3bef37c29075178294a7fc91f148ead636382530ebfa822be4ad8c2f  0002-powerpc-config-defang-gcc-check-for-stack-protector-.patch
f7b994de5ab5172dcfc0f786d1a5c114ebe2801869ddbfbe9f43a849a36a1e50011a1b80ae8c8b0db032a044c19900c11637a00552c0035f172151a86c546d7a  config-lts.aarch64
2aaaef26a52eacd0a2480db4126d09b5335a325ff3a2d4e725f51f8382c19f399fcf0f496243ef4513a159376e0b44dc122ae257c70ac33787a9e1ffb1f77203  config-lts.armv7
f79c8dccca2373b90690678385edb576167563c00ecbebfd20286e31467e7a3baf4bcedc076728afef5060f3f377824c0142ef62c6fbe40aa1e18ad42d166d39  config-lts.x86
a24910d9596f523d5031f672c2df27689cf6f54240eaab182a3ff4400608c7a912a5d061606b2edf9f61fd539e72bc8319d6ccaee57f6fd4aacd19f0394292a7  config-lts.x86_64
6ca87576699a2667d15c5a846808af300af7d400a674ef16c37c67905517b79a2bb0e6e3385da7879cb3de7c62300ff02d7d7c1c5b5448baa46ebe92fec69d66  config-lts.ppc64le
a96a8e6f2d11a14148b17c19d899dda7fe8bed9daad0514162cc0a84645926597d3f258680c506cf028f293a969f4971dab0dff1a9d7a961118bb4f291c9fd55  config-lts.s390x
a6c59c22d8d6683b39817711c3515168c26c9dcde05864be502705837abbc1b554477b5f794145fac8aa2da7626b2e8ab9395a16063b3970ae0fe3cee6ba2bf4  config-lts.mips64
5ff542dbab7975167cc63738d751ef16716f3029d2713fe668870d8fe5497fe82e497dc881bee9d133259de17c796a79e13912955657423ceb746980cc1d6fa5  config-lts.mips
e320d7994e9c3a688f55003c89eed3712b20a480706f29f9ef7da2c0db964f8d3e5cdbfd2057d3f72e3d6c278ca9c7a79669acd73463d89f810e901987408d06  config-virt.aarch64
28a1d7e6ccf5f57a093f873660298bbbaccb13ef4f135beff2081fbad86f7a80259178a4ca3c9c181682736ec40f4e673c52dc270296aada091de91b1ec02c10  config-virt.armv7
da32ce6224e481b76252e6e1f4ed5fa44c49e19e5c1e32e29f0f0f60b74518f11df0479ec1e470e84a318bf56e1fb990b0bf813783142eeb3601d7f1a7d8f5ee  config-virt.x86
df9a7b78b6e077a5113ea2a9daf57abbbb7020701829a803df2e60450908677b74ef66b2b10e09ec6942ba607ed6d63d984be7ad2594fb8a7b2cd4ac3859018d  config-virt.x86_64
b98825f7c80587580a167aad155c55fe33e111c8d98088b73be47629048201189a7f3492eba6946d989a0f09f69ba729d92474226adeea1c548d49e1d60678aa  patch-5.4.31.xz"