oem-azure: add hyperv daemons (#2309)

* oem-azure: add hyperv daemons

This change adds hyperv daemons hv_fcopy, hv_kvp, and hv_vss to the
Azure and HyperV OEM sysexts. hv_kvp specifically is needed to submit OS version
information to the Azure hypervisor.

The daemons, tough userspace programs, are built from the kernel sources
as they are included in the Linux kernel.

As the ebuild is (somewhat)  kernel specific, it should be updated when the kernel
is updated. Respective additions have been made to the kernel update GitHub actions
automation.

Signed-off-by: Thilo Fromm <thilofromm@microsoft.com>
Co-authored-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>

.github/workflows/kernel-apply-patch.sh

@@ -11,6 +11,7 @@ if ! check_remote_branch "linux-${VERSION_NEW}-${TARGET_BRANCH}"; then
     exit 0
 fi
 
+# Dive into ebuild repo section of SDK
 pushd "${SDK_OUTER_OVERLAY}"
 
 # trim the 3rd part in the input semver, e.g. from 5.4.1 to 5.4
@@ -31,6 +32,12 @@ for pkg in sources modules kernel; do
     popd
 done
 
+# Update hyperv daemons ebuild soft-link to reflect new kernel version
+find -D exec app-emulation/hv-daemons/ -type l -exec rm '{}' \;
+ln -s app-emulation/hv-daemons/hv-daemons-9999.ebuild \
+      app-emulation/hv-daemons/hv-daemons-${VERSION_NEW}.ebuild
+
+# Leave ebuild repo section of SDK
 popd
 
 function get_lwn_link() {
@@ -72,7 +79,8 @@ generate_update_changelog 'Linux' "${VERSION_NEW}" "${URL}" 'linux' "${OLD_VERSI
 
 commit_changes sys-kernel/coreos-sources "${VERSION_OLD}" "${VERSION_NEW}" \
                sys-kernel/coreos-modules \
-               sys-kernel/coreos-kernel
+               sys-kernel/coreos-kernel \
+               app-emulation/hv-daemons
 
 cleanup_repo
 

changelog/changes/2024-09-12-azure-hv-daemons.md

@@ -0,0 +1 @@
+- Azure, HyperV: Added daemons `kvp`, `vss`, and `fcopy` for better HyperV hypervisor integration with Flatcar guests ([scripts#2309](https://github.com/flatcar/scripts/pull/2309)).

sdk_container/src/third_party/coreos-overlay/app-emulation/hv-daemons/files/hv_fcopy_daemon.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Hyper-V FCOPY daemon
+ConditionPathExists=/dev/vmbus/hv_fcopy
+
+[Service]
+ExecStart=/usr/bin/hv_fcopy_daemon --no-daemon
+
+[Install]
+WantedBy=multi-user.target

sdk_container/src/third_party/coreos-overlay/app-emulation/hv-daemons/files/hv_kvp_daemon.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Hyper-V KVP daemon
+ConditionPathExists=/dev/vmbus/hv_kvp
+
+[Service]
+ExecStart=/usr/bin/hv_kvp_daemon --no-daemon
+
+[Install]
+WantedBy=multi-user.target

sdk_container/src/third_party/coreos-overlay/app-emulation/hv-daemons/files/hv_vss_daemon.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Hyper-V VSS daemon
+ConditionPathExists=/dev/vmbus/hv_vss
+
+[Service]
+ExecStart=/usr/bin/hv_vss_daemon --no-daemon
+
+[Install]
+WantedBy=multi-user.target

sdk_container/src/third_party/coreos-overlay/app-emulation/hv-daemons/hv-daemons-6.6.50.ebuild

@@ -0,0 +1 @@
+hv-daemons-9999.ebuild

sdk_container/src/third_party/coreos-overlay/app-emulation/hv-daemons/hv-daemons-9999.ebuild

@@ -0,0 +1,32 @@
+# Copyright 2044-2016 The Flatcar Maintainers
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit coreos-kernel savedconfig systemd
+
+DESCRIPTION="HyperV guest support daemons."
+KEYWORDS="amd64 arm64"
+
+if [[ "${PV}" == 9999 ]]; then
+    KEYWORDS="~amd64 ~arm64"
+fi
+
+src_compile() {
+    # Build hv_vss_daemon, hv_kvp_daemon, hv_fcopy_daemon 
+    kmake tools/hv
+}
+
+src_install() {
+    dobin "${S}/build/tools/hv/hv_fcopy_daemon"
+    dobin "${S}/build/tools/hv/hv_kvp_daemon"
+    dobin "${S}/build/tools/hv/hv_vss_daemon"
+
+    systemd_dounit "${FILESDIR}/hv_fcopy_daemon.service"
+    systemd_dounit "${FILESDIR}/hv_kvp_daemon.service"
+    systemd_dounit "${FILESDIR}/hv_vss_daemon.service"
+
+    systemd_enable_service "multi-user.target" "hv_fcopy_daemon.service"
+    systemd_enable_service "multi-user.target" "hv_kvp_daemon.service"
+    systemd_enable_service "multi-user.target" "hv_vss_daemon.service"
+}

sdk_container/src/third_party/coreos-overlay/app-emulation/hv-daemons/metadata.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+</pkgmetadata>

sdk_container/src/third_party/coreos-overlay/coreos-base/oem-azure/oem-azure-2.9.1.1-r3.ebuild

@@ -17,6 +17,7 @@ IUSE=""
 RDEPEND="
   ~app-emulation/wa-linux-agent-${PV}
   net-misc/chrony
+  app-emulation/hv-daemons
 "
 
 # for coreos-base/common-oem-files

sdk_container/src/third_party/coreos-overlay/coreos-base/oem-hyperv/oem-hyperv-0.1.0-r1.ebuild

@@ -15,6 +15,10 @@ IUSE=""
 # no source directory
 S="${WORKDIR}"
 
+RDEPEND="
+  app-emulation/hv-daemons
+"
+
 src_prepare() {
 	default
 	sed -e "s\\@@OEM_VERSION_ID@@\\${PVR}\\g" \