kubelet: remove redundant hostNetwork helper

pkg/kubelet/kubelet.go

@@ -1443,7 +1443,7 @@ func (kl *Kubelet) syncPod(o syncPodOptions) error {
 	}
 
 	// If the network plugin is not ready, only start the pod if it uses the host network
-	if rs := kl.runtimeState.networkErrors(); len(rs) != 0 && !podUsesHostNetwork(pod) {
+	if rs := kl.runtimeState.networkErrors(); len(rs) != 0 && !kubecontainer.IsHostNetworkPod(pod) {
 		return fmt.Errorf("network is not ready: %v", rs)
 	}
 
@@ -1548,7 +1548,7 @@ func (kl *Kubelet) syncPod(o syncPodOptions) error {
 		return err
 	}
 	if egress != nil || ingress != nil {
-		if podUsesHostNetwork(pod) {
+		if kubecontainer.IsHostNetworkPod(pod) {
 			kl.recorder.Event(pod, v1.EventTypeWarning, events.HostNetworkNotSupported, "Bandwidth shaping is not currently supported on the host network")
 		} else if kl.shaper != nil {
 			if len(apiPodStatus.PodIP) > 0 {

pkg/kubelet/kubelet_pods.go

@@ -592,11 +592,6 @@ func (kl *Kubelet) makePodDataDirs(pod *v1.Pod) error {
 	return nil
 }
 
-// returns whether the pod uses the host network namespace.
-func podUsesHostNetwork(pod *v1.Pod) bool {
-	return pod.Spec.HostNetwork
-}
-
 // getPullSecretsForPod inspects the Pod and retrieves the referenced pull
 // secrets.
 // TODO: duplicate secrets are being retrieved multiple times and there
@@ -1066,7 +1061,7 @@ func (kl *Kubelet) generateAPIPodStatus(pod *v1.Pod, podStatus *kubecontainer.Po
 			glog.V(4).Infof("Cannot get host IP: %v", err)
 		} else {
 			s.HostIP = hostIP.String()
-			if podUsesHostNetwork(pod) && s.PodIP == "" {
+			if kubecontainer.IsHostNetworkPod(pod) && s.PodIP == "" {
 				s.PodIP = hostIP.String()
 			}
 		}