Fix: crmadmin: return error if DC is not elected #2902 #3606

If the DC is not yet elected, the crmadmin will return an error.
(This change complements #3606).

Author: Aleksei Burlakov

include/crm/common/results.h

@@ -273,6 +273,7 @@ typedef enum crm_exit_e {
     CRM_EX_NOT_YET_IN_EFFECT    = 111, //!< Requested item is not in effect
     CRM_EX_INDETERMINATE        = 112, //!< Could not determine status
     CRM_EX_UNSATISFIED          = 113, //!< Requested item does not satisfy constraints
+    CRM_EX_DC_NOT_ELECTED_YET   = 114, //!< DC is not yet elected, e.g. right after cluster restart
 
     // Other
     CRM_EX_TIMEOUT              = 124, //!< Convention from timeout(1)

lib/common/results.c

@@ -734,6 +734,7 @@ crm_exit_name(crm_exit_t exit_code)
         case CRM_EX_NOT_YET_IN_EFFECT: return "CRM_EX_NOT_YET_IN_EFFECT";
         case CRM_EX_INDETERMINATE: return "CRM_EX_INDETERMINATE";
         case CRM_EX_UNSATISFIED: return "CRM_EX_UNSATISFIED";
+        case CRM_EX_DC_NOT_ELECTED_YET: return "CRM_EX_DC_NOT_ELECTED_YET";
         case CRM_EX_OLD: return "CRM_EX_OLD";
         case CRM_EX_TIMEOUT: return "CRM_EX_TIMEOUT";
         case CRM_EX_DEGRADED: return "CRM_EX_DEGRADED";
@@ -786,6 +787,7 @@ crm_exit_str(crm_exit_t exit_code)
         case CRM_EX_NOT_YET_IN_EFFECT: return "Requested item is not yet in effect";
         case CRM_EX_INDETERMINATE: return "Could not determine status";
         case CRM_EX_UNSATISFIED: return "Not applicable under current conditions";
+        case CRM_EX_DC_NOT_ELECTED_YET: return "DC is not yet elected";
         case CRM_EX_OLD: return "Update was older than existing configuration";
         case CRM_EX_TIMEOUT: return "Timeout occurred";
         case CRM_EX_DEGRADED: return "Service is active but might fail soon";

lib/pacemaker/pcmk_cluster_queries.c

@@ -235,7 +235,7 @@ designated_controller_event_cb(pcmk_ipc_api_t *controld_api,
 
     reply = (const pcmk_controld_api_reply_t *) event_data;
     out->message(out, "dc", reply->host_from);
-    data->rc = pcmk_rc_ok;
+    data->rc = reply->host_from ? pcmk_rc_ok : CRM_EX_DC_NOT_ELECTED_YET;
 }
 
 /*!