qga: don't disable fsfreeze commands if vss_init fails

The fsfreeze commands are already written to report an error if
vss_init() fails. Reporting a more specific error message is more
helpful than a generic "command is disabled" message, which cannot
between an admin config decision and lack of platform support.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240712132459.3974109-19-berrange@redhat.com>
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>

qga/commands-win32.c

@@ -1203,7 +1203,7 @@ GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
 {
     if (!vss_initialized()) {
-        error_setg(errp, QERR_UNSUPPORTED);
+        error_setg(errp, "fsfreeze not possible as VSS failed to initialize");
         return 0;
     }
 
@@ -1231,7 +1231,7 @@ int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
     Error *local_err = NULL;
 
     if (!vss_initialized()) {
-        error_setg(errp, QERR_UNSUPPORTED);
+        error_setg(errp, "fsfreeze not possible as VSS failed to initialize");
         return 0;
     }
 
@@ -1266,7 +1266,7 @@ int64_t qmp_guest_fsfreeze_thaw(Error **errp)
     int i;
 
     if (!vss_initialized()) {
-        error_setg(errp, QERR_UNSUPPORTED);
+        error_setg(errp, "fsfreeze not possible as VSS failed to initialize");
         return 0;
     }
 
@@ -1961,18 +1961,6 @@ done:
 /* add unsupported commands to the list of blocked RPCs */
 GList *ga_command_init_blockedrpcs(GList *blockedrpcs)
 {
-    if (!vss_init(true)) {
-        g_debug("vss_init failed, vss commands are going to be disabled");
-        const char *list[] = {
-            "guest-get-fsinfo", "guest-fsfreeze-status",
-            "guest-fsfreeze-freeze", "guest-fsfreeze-thaw", NULL};
-        char **p = (char **)list;
-
-        while (*p) {
-            blockedrpcs = g_list_append(blockedrpcs, g_strdup(*p++));
-        }
-    }
-
     return blockedrpcs;
 }
 

qga/main.c

@@ -1395,6 +1395,10 @@ static GAState *initialize_agent(GAConfig *config, int socket_activation)
                    " '%s': %s", config->state_dir, strerror(errno));
         return NULL;
     }
+
+    if (!vss_init(true)) {
+        g_debug("vss_init failed, vss commands will not function");
+    }
 #endif
 
     if (ga_is_frozen(s)) {