[cri] add a second parameter to check if fsnotify watcher closed,

f00231050 · f00231050 · commit 612f5f9f4492 · 2020-12-10T10:07:54.000+08:00
when receiving cni conf dir events
diff --git a/pkg/cri/server/cni_conf_syncer.go b/pkg/cri/server/cni_conf_syncer.go
@@ -73,7 +73,11 @@ func newCNINetConfSyncer(confDir string, netPlugin cni.CNI, loadOpts []cni.CNIOp
 func (syncer *cniNetConfSyncer) syncLoop() error {
 	for {
 		select {
-		case event := <-syncer.watcher.Events:
+		case event, ok := <-syncer.watcher.Events:
+			if !ok {
+				logrus.Debugf("channel is closed")
+				return nil
+			}
 			// Only reload config when receiving write/rename/remove
 			// events
 			//
