F #3161: Fix segmentation fault when OpenNebula is bootstraping the D…

…B in MASTER mode (#3162)

(cherry picked from commit f4ed44a)

src/nebula/Nebula.cc

@@ -174,12 +174,12 @@ void Nebula::start(bool bootstrap_only)
     zone_id            = 0;
     server_id          = -1;
     master_oned        = vatt->vector_value("MASTER_ONED");
+    string mode        = vatt->vector_value("MODE");
+
+    one_util::toupper(mode);
 
     if (vatt != 0)
     {
-        string mode = vatt->vector_value("MODE");
-        one_util::toupper(mode);
-
         if (mode == "STANDALONE")
         {
             federation_enabled = false;
@@ -339,6 +339,12 @@ void Nebula::start(bool bootstrap_only)
             throw runtime_error("Database version mismatch. Check oned.log.");
         }
 
+        if ((local_bootstrap || shared_bootstrap) && (mode != "STANDALONE"))
+        {
+            throw runtime_error("Database has to be bootstraped to start"
+                    " oned in FEDERATION");
+        }
+
         // ---------------------------------------------------------------------
         // Initialize logging and federation database facilities and SystemDB
         // ---------------------------------------------------------------------