sys-fs/zfs-kmod: migrate to linux-mod-r1

(sam: Taking ionen's PoC conversion and committing it after testing.)

Closes: https://bugs.gentoo.org/814194
Closes: https://bugs.gentoo.org/865157
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>
Signed-off-by: Sam James <sam@gentoo.org>

2 files changed, 221 insertions, 0 deletions

diff --git a/sys-fs/zfs-kmod/files/zfs-kmod-2.1.11-gentoo.patch b/sys-fs/zfs-kmod/files/zfs-kmod-2.1.11-gentoo.patch
new file mode 100644
index 000000000000..53c5f27b3bed
--- /dev/null
+++ b/sys-fs/zfs-kmod/files/zfs-kmod-2.1.11-gentoo.patch
@@ -0,0 +1,24 @@
+Hack to pass the full linux-mod-r1 toolchain to make during ./configure.
+Not needed at build time given can pass it normally then.
+
+Eclass has workarounds, compiler/version matching, and its own set of
+user variables which creates disparity between ebuilds if not used.
+
+For the (normal) alternative: KERNEL_{CC,LD} alone is insufficient,
+but combining with KERNEL_LLVM=1 when CC_IS_CLANG will allow it
+to work for *most* people (will likely still need KERNEL_LD from
+linux-mod-r1, or ThinLTO kernels may fail with sandbox violations).
+
+Note KERNEL_* also cause failure if they contain spaces.
+
+https://bugs.gentoo.org/865157
+--- a/config/kernel.m4
++++ b/config/kernel.m4
+@@ -646,6 +646,5 @@
+ 	AC_TRY_COMMAND([
+ 	    KBUILD_MODPOST_NOFINAL="$5" KBUILD_MODPOST_WARN="$6"
+-	    make modules -k -j$TEST_JOBS ${KERNEL_CC:+CC=$KERNEL_CC}
+-	    ${KERNEL_LD:+LD=$KERNEL_LD} ${KERNEL_LLVM:+LLVM=$KERNEL_LLVM}
++	    make modules -k -j$TEST_JOBS '${GENTOO_MAKEARGS_EVAL}'
+ 	    CONFIG_MODULES=y CFLAGS_MODULE=-DCONFIG_MODULES
+ 	    -C $LINUX_OBJ $ARCH_UM M=$PWD/$1 >$1/build.log 2>&1])
diff --git a/sys-fs/zfs-kmod/zfs-kmod-2.1.11-r1.ebuild b/sys-fs/zfs-kmod/zfs-kmod-2.1.11-r1.ebuild
new file mode 100644
index 000000000000..146556170e08
--- /dev/null
+++ b/sys-fs/zfs-kmod/zfs-kmod-2.1.11-r1.ebuild
@@ -0,0 +1,197 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit autotools dist-kernel-utils flag-o-matic linux-mod-r1 multiprocessing
+
+DESCRIPTION="Linux ZFS kernel module for sys-fs/zfs"
+HOMEPAGE="https://github.com/openzfs/zfs"
+
+if [[ ${PV} == "9999" ]]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/openzfs/zfs.git"
+else
+	VERIFY_SIG_OPENPGP_KEY_PATH=${BROOT}/usr/share/openpgp-keys/openzfs.asc
+	inherit verify-sig
+
+	MY_PV="${PV/_rc/-rc}"
+	SRC_URI="https://github.com/openzfs/zfs/releases/download/zfs-${MY_PV}/zfs-${MY_PV}.tar.gz"
+	SRC_URI+=" verify-sig? ( https://github.com/openzfs/zfs/releases/download/zfs-${MY_PV}/zfs-${MY_PV}.tar.gz.asc )"
+	S="${WORKDIR}/zfs-${PV%_rc?}"
+	ZFS_KERNEL_COMPAT="6.2"
+
+	# increments minor eg 5.14 -> 5.15, and still supports override.
+	ZFS_KERNEL_DEP="${ZFS_KERNEL_COMPAT_OVERRIDE:-${ZFS_KERNEL_COMPAT}}"
+	ZFS_KERNEL_DEP="${ZFS_KERNEL_DEP%%.*}.$(( ${ZFS_KERNEL_DEP##*.} + 1))"
+
+	if [[ ${PV} != *_rc* ]]; then
+		KEYWORDS="~amd64 ~arm64 ~ppc64 ~riscv ~sparc"
+	fi
+fi
+
+LICENSE="CDDL MIT debug? ( GPL-2+ )"
+SLOT="0/${PVR}"
+IUSE="custom-cflags debug +rootfs"
+
+RDEPEND="${DEPEND}"
+
+BDEPEND="
+	dev-lang/perl
+	app-alternatives/awk
+"
+
+# we want dist-kernel block in BDEPEND because of portage resolver.
+# since linux-mod.eclass already sets version-unbounded dep, portage
+# will pull new versions. So we set it in BDEPEND which takes priority.
+# and we don't need in in git ebuild.
+if [[ ${PV} != "9999" ]] ; then
+	BDEPEND+="
+		verify-sig? ( sec-keys/openpgp-keys-openzfs )
+		dist-kernel? ( <virtual/dist-kernel-${ZFS_KERNEL_DEP}:= )
+	"
+fi
+
+# PDEPEND in this form is needed to trick portage suggest
+# enabling dist-kernel if only 1 package have it set
+PDEPEND="dist-kernel? ( ~sys-fs/zfs-${PV}[dist-kernel] )"
+
+RESTRICT="debug? ( strip ) test"
+
+DOCS=( AUTHORS COPYRIGHT META README.md )
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-2.1.11-gentoo.patch
+)
+
+pkg_pretend() {
+	use rootfs || return 0
+
+	if has_version virtual/dist-kernel && ! use dist-kernel; then
+		ewarn "You have virtual/dist-kernel installed, but"
+		ewarn "USE=\"dist-kernel\" is not enabled for ${CATEGORY}/${PN}"
+		ewarn "It's recommended to globally enable dist-kernel USE flag"
+		ewarn "to auto-trigger initrd rebuilds with kernel updates"
+	fi
+}
+
+pkg_setup() {
+	CONFIG_CHECK="
+		!DEBUG_LOCK_ALLOC
+		EFI_PARTITION
+		MODULES
+		!PAX_KERNEXEC_PLUGIN_METHOD_OR
+		!TRIM_UNUSED_KSYMS
+		ZLIB_DEFLATE
+		ZLIB_INFLATE
+	"
+
+	use debug && CONFIG_CHECK="${CONFIG_CHECK}
+		FRAME_POINTER
+		DEBUG_INFO
+		!DEBUG_INFO_REDUCED
+	"
+
+	use rootfs && \
+		CONFIG_CHECK="${CONFIG_CHECK}
+			BLK_DEV_INITRD
+			DEVTMPFS
+	"
+
+	kernel_is -lt 5 && CONFIG_CHECK="${CONFIG_CHECK} IOSCHED_NOOP"
+
+	if [[ ${PV} != "9999" ]]; then
+		local kv_major_max kv_minor_max zcompat
+		zcompat="${ZFS_KERNEL_COMPAT_OVERRIDE:-${ZFS_KERNEL_COMPAT}}"
+		kv_major_max="${zcompat%%.*}"
+		zcompat="${zcompat#*.}"
+		kv_minor_max="${zcompat%%.*}"
+		kernel_is -le "${kv_major_max}" "${kv_minor_max}" || die \
+			"Linux ${kv_major_max}.${kv_minor_max} is the latest supported version"
+
+	fi
+
+	kernel_is -ge 3 10 || die "Linux 3.10 or newer required"
+
+	linux-mod-r1_pkg_setup
+}
+
+src_unpack() {
+	if use verify-sig ; then
+		# Needed for downloaded patch (which is unsigned, which is fine)
+		verify-sig_verify_detached "${DISTDIR}"/zfs-${MY_PV}.tar.gz{,.asc}
+	fi
+
+	default
+}
+
+src_prepare() {
+	default
+
+	# Run unconditionally (bug #792627)
+	eautoreconf
+
+	if [[ ${PV} != "9999" ]]; then
+		# Set module revision number
+		sed -i "s/\(Release:\)\(.*\)1/\1\2${PR}-gentoo/" META || die "Could not set Gentoo release"
+	fi
+}
+
+src_configure() {
+	use custom-cflags || strip-flags
+
+	filter-ldflags -Wl,*
+
+	local myconf=(
+		--bindir="${EPREFIX}/bin"
+		--sbindir="${EPREFIX}/sbin"
+		--with-config=kernel
+		--with-linux="${KV_DIR}"
+		--with-linux-obj="${KV_OUT_DIR}"
+		$(use_enable debug)
+
+		# See gentoo.patch
+		GENTOO_MAKEARGS_EVAL="${MODULES_MAKEARGS[*]@Q}"
+		TEST_JOBS="$(makeopts_jobs)"
+	)
+
+	econf "${myconf[@]}"
+}
+
+src_compile() {
+	emake "${MODULES_MAKEARGS[@]}"
+}
+
+src_install() {
+	emake "${MODULES_MAKEARGS[@]}" DESTDIR="${ED}" install
+	modules_post_process
+
+	einstalldocs
+}
+
+pkg_postinst() {
+	linux-mod-r1_pkg_postinst
+
+	if [[ -z ${ROOT} ]] && use dist-kernel; then
+		dist-kernel_reinstall_initramfs "${KV_DIR}" "${KV_FULL}"
+	fi
+
+	if use x86 || use arm; then
+		ewarn "32-bit kernels will likely require increasing vmalloc to"
+		ewarn "at least 256M and decreasing zfs_arc_max to some value less than that."
+	fi
+
+	if has_version sys-boot/grub; then
+		ewarn "This version of OpenZFS includes support for new feature flags"
+		ewarn "that are incompatible with previous versions. GRUB2 support for"
+		ewarn "/boot with the new feature flags is not yet available."
+		ewarn "Do *NOT* upgrade root pools to use the new feature flags."
+		ewarn "Any new pools will be created with the new feature flags by default"
+		ewarn "and will not be compatible with older versions of OpenZFS. To"
+		ewarn "create a new pool that is backward compatible wih GRUB2, use "
+		ewarn
+		ewarn "zpool create -o compatibility=grub2 ..."
+		ewarn
+		ewarn "Refer to /usr/share/zfs/compatibility.d/grub2 for list of features."
+	fi
+}