qemu-ga: skip starting on bare metal device

The same firmware image may be deployed on either bare metal device or
virtualized platforms (e.g., Proxmox VE).

On bare metal device, `qemu-ga` may still be started even though no
virtio-serial channel is available, resulting in repeated attempts to
access /dev/virtio-ports/org.qemu.guest_agent.0.

This causes continuous service respawning by procd and unnecessary log
spam.

This commit adds a pre-check for /dev/virtio-ports to avoid starting
`qemu-ga` when virtio-serial support is not present.

Signed-off-by: Andy Chiang <AndyChiang_git@outlook.com>

utils/qemu/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=qemu
 PKG_VERSION:=10.1.3
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=https://download.qemu.org/
 PKG_HASH:=fbaa7a0d7a9a1deb5695b125916746ec28fe0de6275d4454f3e3bbaf8b339b53

utils/qemu/files/qemu-ga.init

@@ -7,6 +7,10 @@ USE_PROCD=1
 BIN=/usr/bin/qemu-ga
 
 start_service() {
+	if [ ! -d /dev/virtio-ports ];then
+		logger -t qemu-ga -p daemon.notice "/dev/virtio-ports not found. Skipping qemu-ga (this is normal on bare metal device)."
+		return 0
+	fi
 	procd_open_instance
 	procd_set_param command $BIN
 	procd_set_param respawn