code: func (s *daemonSetLister) GetPodDaemonSets(pod *v1.Pod) ([]*apps.DaemonSet, error) {
  	var selector labels.Selector
  	var daemonSet *apps.DaemonSet
  
  	if len(pod.Labels) == 0 {
  		return nil, fmt.Errorf("no daemon sets found for pod %v because it has no labels", pod.Name)
  	}
  
  	list, err := s.DaemonSets(pod.Namespace).List(labels.Everything())
  	if err != nil {
  		return nil, err
  	}
  
  	var daemonSets []*apps.DaemonSet
  	for i := range list {
  		daemonSet = list[i]
  		if daemonSet.Namespace != pod.Namespace {
  			continue
  		}
  		selector, err = metav1.LabelSelectorAsSelector(daemonSet.Spec.Selector)
  		if err != nil {
  			// this should not happen if the DaemonSet passed validation
  			return nil, err
  		}
  
  		// If a daemonSet with a nil or empty selector creeps in, it should match nothing, not everything.
  		if selector.Empty() || !selector.Matches(labels.Set(pod.Labels)) {
  			continue
  		}
  		daemonSets = append(daemonSets, daemonSet)
  	}
  
  	if len(daemonSets) == 0 {
  		return nil, fmt.Errorf("could not find daemon set for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
  	}
  
  	return daemonSets, nil
  }
docs: // GetPodDaemonSets returns a list of DaemonSets that potentially match a pod.
  // Only the one specified in the Pod's ControllerRef will actually manage it.
  // Returns an error only if no matching DaemonSets are found.