Get started with vmop-agent.

dev-example/vmop-agent/99-vmop-agent.rules

@@ -0,0 +1,2 @@
+SUBSYSTEM=="virtio-ports", ATTR{name}=="org.jdrupes.vmop_agent.0", \
+  TAG+="systemd" ENV{SYSTEMD_WANTS}="vmop-agent.service"

dev-example/vmop-agent/vmop-agent

@@ -0,0 +1,19 @@
+#!/usr/bin/bash
+
+hostSerial="/dev/virtio-ports/org.jdrupes.vmop_agent.0"
+
+if [ ! -w "$hostSerial" ]; then
+  echo >&2 "Device $hostSerial not writable"
+  exit 1
+fi
+
+if ! exec {con}<>"$hostSerial"; then
+  echo >&2 "Cannot open device $hostSerial"
+  exit 1
+fi
+
+echo >&${con} "220 Hello"
+
+while read line <&${con}; do
+  true
+done

dev-example/vmop-agent/vmop-agent.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=VM-Operator (Guest) Agent
+BindsTo=dev-virtio\x2dports-org.jdrupes.vmop_agent.0.device
+After=dev-virtio\x2dports-org.jdrupes.vmop_agent.0.device multi-user.target
+IgnoreOnIsolate=True
+
+[Service]
+UMask=0077
+#EnvironmentFile=/etc/sysconfig/vmop-agent
+ExecStart=/usr/local/libexec/vmop-agent
+Restart=always
+RestartSec=0
+
+[Install]
+WantedBy=dev-virtio\x2dports-org.jdrupes.vmop_agent.0.device

org.jdrupes.vmoperator.runner.qemu/src/org/jdrupes/vmoperator/runner/qemu/StatusUpdater.java

@@ -47,6 +47,7 @@
 import org.jdrupes.vmoperator.runner.qemu.events.RunnerStateChange;
 import org.jdrupes.vmoperator.runner.qemu.events.RunnerStateChange.RunState;
 import org.jdrupes.vmoperator.runner.qemu.events.ShutdownEvent;
+import org.jdrupes.vmoperator.runner.qemu.events.VmopAgentConnected;
 import org.jdrupes.vmoperator.util.GsonPtr;
 import org.jgrapes.core.Channel;
 import org.jgrapes.core.annotation.Handler;
@@ -192,20 +193,21 @@ public void onRunnerStateChanged(RunnerStateChange event)
                 status.addProperty("ram", GsonPtr.to(from.data())
                     .getAsString("spec", "vm", "maximumRam").orElse("0"));
                 status.addProperty("cpus", 1);
-
-                // In case we had an irregular shutdown
-                status.remove("osinfo");
             } else if (event.runState() == RunState.STOPPED) {
                 status.addProperty("ram", "0");
                 status.addProperty("cpus", 0);
-                status.remove("osinfo");
             }
 
-            // In case console connection was still present
             if (!running) {
+                // In case console connection was still present
                 status.addProperty("consoleClient", "");
                 updateCondition(from, status, "ConsoleConnected", false,
-                    "VmStopped", "The VM has been shut down");
+                    "VmStopped", "The VM is not running");
+
+                // In case we had an irregular shutdown
+                status.remove("osinfo");
+                updateCondition(vmDef, vmDef.statusJson(), "VmopAgentConnected",
+                    false, "VmStopped", "The VM is not running");
             }
             return status;
         });
@@ -322,4 +324,24 @@ public void onOsinfo(OsinfoEvent event) throws ApiException {
         });
 
     }
+
+    /**
+     * @param event the event
+     * @throws ApiException 
+     */
+    @Handler
+    @SuppressWarnings("PMD.AssignmentInOperand")
+    public void onVmopAgentConnected(VmopAgentConnected event)
+            throws ApiException {
+        VmDefinition vmDef;
+        if (vmStub == null || (vmDef = vmStub.model().orElse(null)) == null) {
+            return;
+        }
+        vmStub.updateStatus(from -> {
+            JsonObject status = from.statusJson();
+            updateCondition(vmDef, status, "VmopAgentConnected",
+                true, "VmopAgentStarted", "The VM operator agent is running");
+            return status;
+        });
+    }
 }

org.jdrupes.vmoperator.runner.qemu/src/org/jdrupes/vmoperator/runner/qemu/VmopAgentClient.java

@@ -19,6 +19,7 @@
 package org.jdrupes.vmoperator.runner.qemu;
 
 import java.io.IOException;
+import org.jdrupes.vmoperator.runner.qemu.events.VmopAgentConnected;
 import org.jgrapes.core.Channel;
 
 /**
@@ -42,7 +43,9 @@ public VmopAgentClient(Channel componentChannel) throws IOException {
 
     @Override
     protected void processInput(String line) throws IOException {
-        // TODO Auto-generated method stub
+        if (line.startsWith("220 ")) {
+            rep().fire(new VmopAgentConnected());
+        }
     }
 
 }

org.jdrupes.vmoperator.runner.qemu/src/org/jdrupes/vmoperator/runner/qemu/events/VmopAgentConnected.java

@@ -0,0 +1,27 @@
+/*
+ * VM-Operator
+ * Copyright (C) 2025 Michael N. Lipp
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.jdrupes.vmoperator.runner.qemu.events;
+
+import org.jgrapes.core.Event;
+
+/**
+ * Signals information about the guest OS.
+ */
+public class VmopAgentConnected extends Event<Void> {
+}