ayaports/user/linux-rm/APKBUILD

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

_flavor=rm
pkgname=linux-${_flavor}
pkgver=5.4.70
pkgrel=1
_rmver=1.3.3
pkgdesc="Linux rm kernel"
url="https://www.kernel.org"
depends="initramfs-generator"
_depends_dev="perl gmp-dev mpc1-dev mpfr-dev elfutils-dev bash flex bison zstd"
makedepends="$_depends_dev sed installkernel bc linux-headers linux-firmware-any openssl-dev>3 mawk
	diffutils findutils zstd pahole python3 lzop"
options="!strip"
_config=${config:-config-lts.${CARCH}}
source="
	https://github.com/reMarkable/linux/archive/refs/tags/RM1XX_${pkgver}_v$_rmver.tar.gz
	enable-automatic-partial-refreshing.patch
	enable-sdhc1.patch
	iwd-crypto.patch
	"
subpackages="$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="$srcdir"/linux-RM1XX_${pkgver}_v$_rmver
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

_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"
}

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

build() {
	unset LDFLAGS
	export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"
	msg "Building $_flavor kernel"
	make ARCH="$(_kernelarch $CARCH)" \
		CC="${CC:-gcc}" \
		AWK="${AWK:-mawk}" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine"
}

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

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

	local _abi_release="$(make -s kernelrelease)"

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

	make -j1 modules_install zinstall dtbs_install \
		ARCH="$(_kernelarch $CARCH)" \
		INSTALL_MOD_PATH="$pkgdir" \
		INSTALL_MOD_STRIP=1 \
		INSTALL_PATH="$pkgdir"/boot \
		INSTALL_DTBS_PATH="$pkgdir/boot/dtbs-rm"

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

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


	# copy files for linux-lts-doc sub package
	mkdir -p "$pkgdir"/usr/share/doc
	cp -r "$builddir"/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
}

_dev() {
	local _flavor=$(echo $subpkgname | sed -E 's/(^linux-|-dev$)//g')
	local _builddir="$builddir"
	local _abi_release="$(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 \
		"$dir"/

	make -j1 -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 -name include -type d -print | while IFS='' read -r folder; do
		find "$folder" -type f | cpio -pdm "$dir"
	done

	install -Dm644 "$srcdir"/$builddir/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="
80ab274ca3d30935d9913490662f17499c1ceedb438fe171554097d25ffc1cf85ee53f0c1642e94c0b833fdfb17636cd554bf685e4a6f5dac20cf122c1a25447  RM1XX_5.4.70_v1.3.3.tar.gz
0f47278c5bfafb939e46224fbf16f9491e3cc560ac128dcf430a1f6cf9064fb1c5bf5db1a3076c35d30c004aec525a7d6616a647564f197bb29c57701c1db982  enable-automatic-partial-refreshing.patch
301dbb765bc2759cb8bd13d200d2c8818e3b43848c0c72574926b3da698d938298a0f4a4165cf00c4c9a27c5aa88532723607ffd51388d895828ee27fa89e7b5  enable-sdhc1.patch
1275b8d5b0c9edcd30db63325c8cda23bad7322ffeb8bfdde69a1208e9d7ae7025058e54b2b03e961ec80ded8f98e018dbfa280ae013b8c2da2204614094b8c6  iwd-crypto.patch
"