Fix for #2842, instead of returning the first Pod, return the one whi… (#2846)

* Fix for #2842, instead of returning the first Pod, return the one which is Running

* a more memory efficient version of the fix, string -> bool

* fix with no extra fields in struct, return nil at Pod conversion if Pod is not Running

* let Kuberneretes filter for Running Pods using FieldSelector

* filter for Pods that are Running and Pending (implicit)

plugin/kubernetes/controller.go

@@ -214,6 +214,10 @@ func podListFunc(c kubernetes.Interface, ns string, s labels.Selector) func(meta
 		if s != nil {
 			opts.LabelSelector = s.String()
 		}
+		if len(opts.FieldSelector) > 0 {
+			opts.FieldSelector = opts.FieldSelector + ","
+		}
+		opts.FieldSelector = opts.FieldSelector + "status.phase!=Succeeded,status.phase!=Failed,status.phase!=Unknown"
 		listV1, err := c.CoreV1().Pods(ns).List(opts)
 		return listV1, err
 	}

plugin/kubernetes/watch.go

@@ -22,6 +22,10 @@ func podWatchFunc(c kubernetes.Interface, ns string, s labels.Selector) func(opt
 		if s != nil {
 			options.LabelSelector = s.String()
 		}
+		if len(options.FieldSelector) > 0 {
+			options.FieldSelector = options.FieldSelector + ","
+		}
+		options.FieldSelector = options.FieldSelector + "status.phase!=Succeeded,status.phase!=Failed,status.phase!=Unknown"
 		w, err := c.CoreV1().Pods(ns).Watch(options)
 		return w, err
 	}