Report error if there are no matching wwpns found during publish.

Author: VinayKumarHavanur

storage_drivers/ontap/ontap_common.go

@@ -983,6 +983,7 @@ func PublishLUN(
 	} else if config.SANType == sa.FCP {
 		// Add wwpns to igroup
 
+		var wwpn string
 		// Get the WWPNs and WWNNs from the host and propagate only the ones which are mapped to SVM
 		for initiatorPortName, targetPortNames := range publishInfo.HostWWPNMap {
 			// Format the WWNNs to match the SVM WWNNs
@@ -991,7 +992,7 @@ func PublishLUN(
 				// Add initiator port name to igroup, if the target port name is mapped to SVM
 				if nodeName == portNameFormatted {
 					portName := strings.TrimPrefix(initiatorPortName, "0x")
-					wwpn := fcp.ConvertStrToWWNFormat(portName)
+					wwpn = fcp.ConvertStrToWWNFormat(portName)
 
 					err = clientAPI.EnsureIgroupAdded(ctx, igroupName, wwpn)
 					if err != nil {
@@ -1000,6 +1001,12 @@ func PublishLUN(
 				}
 			}
 		}
+
+		if wwpn == "" {
+			err = fmt.Errorf("no matching WWPN found for node %v", nodeName)
+			Logc(ctx).Error(err)
+			return err
+		}
 	}
 
 	// Map LUN (it may already be mapped)