qemu: remove redundant needReply argument of qemuAgentCommand

needReply added in [1] looks redundant. Indeed it is set to false only
when mon->await_event is set too (the only exception qemuAgentFSTrim
which is mistaken).

However it fixes the issue when qemuAgentCommand exits on error path and
mon->await_event is not reset. Let's instead reset mon->await_event properly.

Also remove "Woken up by event" debug message as it can be misleading.
We can get it also if monitor is closed due to serial changed event
currently. Anyway both qemuAgentClose and qemuAgentNotifyEvent log
itself.

[1] qemu: make sure agent returns error when required data are missing
Signed-off-by: NNikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_agent.c

@@ -1096,7 +1096,6 @@ static int
 qemuAgentCommand(qemuAgentPtr agent,
                  virJSONValuePtr cmd,
                  virJSONValuePtr *reply,
-                 bool needReply,
                  int seconds)
 {
     int ret = -1;
@@ -1105,18 +1104,17 @@ qemuAgentCommand(qemuAgentPtr agent,
     int await_event = agent->await_event;
 
     *reply = NULL;
+    memset(&msg, 0, sizeof(msg));
 
     if (!agent->running) {
         virReportError(VIR_ERR_AGENT_UNRESPONSIVE, "%s",
                        _("Guest agent disappeared while executing command"));
-        return -1;
+        goto cleanup;
     }
 
     if (qemuAgentGuestSync(agent) < 0)
         return -1;
 
-    memset(&msg, 0, sizeof(msg));
-
     if (!(cmdstr = virJSONValueToString(cmd, false)))
         goto cleanup;
     msg.txBuffer = g_strdup_printf("%s" LINE_ENDING, cmdstr);
@@ -1129,30 +1127,32 @@ qemuAgentCommand(qemuAgentPtr agent,
     VIR_DEBUG("Receive command reply ret=%d rxObject=%p",
               ret, msg.rxObject);
 
-    if (ret == 0) {
-        /* If we haven't obtained any reply but we wait for an
-         * event, then don't report this as error */
-        if (!msg.rxObject) {
-            if (await_event && !needReply) {
-                VIR_DEBUG("Woken up by event %d", await_event);
+    if (ret < 0)
+        goto cleanup;
+
+    /* If we haven't obtained any reply but we wait for an
+     * event, then don't report this as error */
+    if (!msg.rxObject) {
+        if (!await_event) {
+            if (agent->running) {
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                               _("Missing agent reply object"));
             } else {
-                if (agent->running)
-                    virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                                   _("Missing agent reply object"));
-                else
-                    virReportError(VIR_ERR_AGENT_UNRESPONSIVE, "%s",
-                                   _("Guest agent disappeared while executing command"));
-                ret = -1;
+                virReportError(VIR_ERR_AGENT_UNRESPONSIVE, "%s",
+                               _("Guest agent disappeared while executing command"));
             }
-        } else {
-            *reply = msg.rxObject;
-            ret = qemuAgentCheckError(cmd, *reply);
+            ret = -1;
         }
+        goto cleanup;
     }
 
+    *reply = msg.rxObject;
+    ret = qemuAgentCheckError(cmd, *reply);
+
  cleanup:
     VIR_FREE(cmdstr);
     VIR_FREE(msg.txBuffer);
+    agent->await_event = QEMU_AGENT_EVENT_NONE;
 
     return ret;
 }
@@ -1253,7 +1253,7 @@ int qemuAgentShutdown(qemuAgentPtr agent,
         agent->await_event = QEMU_AGENT_EVENT_RESET;
     else
         agent->await_event = QEMU_AGENT_EVENT_SHUTDOWN;
-    ret = qemuAgentCommand(agent, cmd, &reply, false,
+    ret = qemuAgentCommand(agent, cmd, &reply,
                            VIR_DOMAIN_QEMU_AGENT_COMMAND_SHUTDOWN);
 
     virJSONValueFree(cmd);
@@ -1296,7 +1296,7 @@ int qemuAgentFSFreeze(qemuAgentPtr agent, const char **mountpoints,
     if (!cmd)
         goto cleanup;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0)
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0)
         goto cleanup;
 
     if (virJSONValueObjectGetNumberInt(reply, "return", &ret) < 0) {
@@ -1333,7 +1333,7 @@ int qemuAgentFSThaw(qemuAgentPtr agent)
     if (!cmd)
         return -1;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0)
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0)
         goto cleanup;
 
     if (virJSONValueObjectGetNumberInt(reply, "return", &ret) < 0) {
@@ -1370,7 +1370,7 @@ qemuAgentSuspend(qemuAgentPtr agent,
         return -1;
 
     agent->await_event = QEMU_AGENT_EVENT_SUSPEND;
-    ret = qemuAgentCommand(agent, cmd, &reply, false, agent->timeout);
+    ret = qemuAgentCommand(agent, cmd, &reply, agent->timeout);
 
     virJSONValueFree(cmd);
     virJSONValueFree(reply);
@@ -1399,7 +1399,7 @@ qemuAgentArbitraryCommand(qemuAgentPtr agent,
     if (!(cmd = virJSONValueFromString(cmd_str)))
         goto cleanup;
 
-    if ((ret = qemuAgentCommand(agent, cmd, &reply, true, timeout)) < 0)
+    if ((ret = qemuAgentCommand(agent, cmd, &reply, timeout)) < 0)
         goto cleanup;
 
     if (!(*result = virJSONValueToString(reply, false)))
@@ -1426,7 +1426,7 @@ qemuAgentFSTrim(qemuAgentPtr agent,
     if (!cmd)
         return ret;
 
-    ret = qemuAgentCommand(agent, cmd, &reply, false, agent->timeout);
+    ret = qemuAgentCommand(agent, cmd, &reply, agent->timeout);
 
     virJSONValueFree(cmd);
     virJSONValueFree(reply);
@@ -1447,7 +1447,7 @@ qemuAgentGetVCPUs(qemuAgentPtr agent,
     if (!(cmd = qemuAgentMakeCommand("guest-get-vcpus", NULL)))
         return -1;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0)
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0)
         goto cleanup;
 
     if (!(data = virJSONValueObjectGetArray(reply, "return"))) {
@@ -1560,7 +1560,7 @@ qemuAgentSetVCPUsCommand(qemuAgentPtr agent,
                                      NULL)))
         goto cleanup;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0)
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0)
         goto cleanup;
 
     /* All negative values are invalid. Return of 0 is bogus since we wouldn't
@@ -1715,7 +1715,7 @@ qemuAgentGetHostname(qemuAgentPtr agent,
     if (!cmd)
         return ret;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0) {
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0) {
         if (qemuAgentErrorCommandUnsupported(reply))
             ret = -2;
         goto cleanup;
@@ -1759,7 +1759,7 @@ qemuAgentGetTime(qemuAgentPtr agent,
     if (!cmd)
         return ret;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0)
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0)
         goto cleanup;
 
     if (virJSONValueObjectGetNumberUlong(reply, "return", &json_time) < 0) {
@@ -1824,7 +1824,7 @@ qemuAgentSetTime(qemuAgentPtr agent,
     if (!cmd)
         return ret;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0)
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0)
         goto cleanup;
 
     ret = 0;
@@ -1961,7 +1961,7 @@ qemuAgentGetFSInfo(qemuAgentPtr agent,
     if (!cmd)
         return ret;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0) {
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0) {
         if (qemuAgentErrorCommandUnsupported(reply))
             ret = -2;
         goto cleanup;
@@ -2112,7 +2112,7 @@ qemuAgentGetInterfaces(qemuAgentPtr agent,
     if (!(cmd = qemuAgentMakeCommand("guest-network-get-interfaces", NULL)))
         goto cleanup;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0)
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0)
         goto cleanup;
 
     if (!(ret_array = virJSONValueObjectGet(reply, "return"))) {
@@ -2289,7 +2289,7 @@ qemuAgentSetUserPassword(qemuAgentPtr agent,
                                      NULL)))
         goto cleanup;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0)
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0)
         goto cleanup;
 
     ret = 0;
@@ -2320,7 +2320,7 @@ qemuAgentGetUsers(qemuAgentPtr agent,
     if (!(cmd = qemuAgentMakeCommand("guest-get-users", NULL)))
         return -1;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0) {
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0) {
         if (qemuAgentErrorCommandUnsupported(reply))
             return -2;
         return -1;
@@ -2409,7 +2409,7 @@ qemuAgentGetOSInfo(qemuAgentPtr agent,
     if (!(cmd = qemuAgentMakeCommand("guest-get-osinfo", NULL)))
         return -1;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0) {
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0) {
         if (qemuAgentErrorCommandUnsupported(reply))
             return -2;
         return -1;
@@ -2464,7 +2464,7 @@ qemuAgentGetTimezone(qemuAgentPtr agent,
     if (!(cmd = qemuAgentMakeCommand("guest-get-timezone", NULL)))
         return -1;
 
-    if (qemuAgentCommand(agent, cmd, &reply, true, agent->timeout) < 0) {
+    if (qemuAgentCommand(agent, cmd, &reply, agent->timeout) < 0) {
         if (qemuAgentErrorCommandUnsupported(reply))
             return -2;
         return -1;