fix the channel that never receives a value

fix the code with the linter's recommendation by https://github.com/goharbor/harbor/blob/main/CONTRIBUTING.md#develop-build-and-test

Signed-off-by: iAklis <chenpinwei@gmail.com>

src/registryctl/api/registry/test/util.go

@@ -82,7 +82,7 @@ func GetAnyKey(digests map[digest.Digest]io.ReadSeeker) (d digest.Digest) {
 	return
 }
 
-// GetAnyKeys ...
+// GetKeys ...
 func GetKeys(digests map[digest.Digest]io.ReadSeeker) (ds []digest.Digest) {
 	for d := range digests {
 		ds = append(ds, d)

src/registryctl/main.go

@@ -57,6 +57,7 @@ func (s *RegistryCtl) Start() {
 		TLSConfig: common_http.NewServerTLSConfig(),
 	}
 	ctx := context.Background()
+	shutdown := make(chan struct{})
 	regCtl.RegisterOnShutdown(tracelib.InitGlobalTracer(ctx))
 	// graceful shutdown
 	go func() {
@@ -65,6 +66,8 @@ func (s *RegistryCtl) Start() {
 		<-sig
 		context, cancel := context.WithTimeout(ctx, 5*time.Second)
 		defer cancel()
+		defer close(shutdown)
+
 		log.Infof("Got an interrupt, shutting down...")
 		if err := regCtl.Shutdown(context); err != nil {
 			log.Fatalf("Failed to shutdown registry controller: %v", err)
@@ -81,7 +84,7 @@ func (s *RegistryCtl) Start() {
 	} else {
 		err = regCtl.ListenAndServe()
 	}
-	<-ctx.Done()
+	<-shutdown
 	if err != nil {
 		log.Fatal(err)
 	}