feature: check if there is a running cluster, if exist, should not mo…

…unt new image.

cmd/sealer/cmd/cluster/run.go

@@ -187,6 +187,7 @@ func runWithClusterfile(clusterFile string, runFlags *types.RunFlags) error {
 	}
 
 	cf.SetCluster(*cluster)
+
 	imageName := cluster.Spec.Image
 	imageEngine, err := imageengine.NewImageEngine(options.EngineGlobalConfigurations{})
 	if err != nil {
@@ -219,6 +220,11 @@ func runWithClusterfile(clusterFile string, runFlags *types.RunFlags) error {
 }
 
 func createNewCluster(imageEngine imageengine.Interface, cf clusterfile.Interface, imageSpec *imagev1.ImageSpec, mode string) error {
+	//check cluster
+	if err := checkClusterIsExists(cf); err != nil {
+		return err
+	}
+
 	cluster := cf.GetCluster()
 	infraDriver, err := infradriver.NewInfraDriver(&cluster)
 	if err != nil {
@@ -416,3 +422,16 @@ func installApplication(appImageName string, envs []string, app *v2.Application,
 
 	return nil
 }
+
+func checkClusterIsExists(cf clusterfile.Interface) error {
+	rawCluster := cf.GetCluster()
+	file, err := clusterfile.NewClusterFile(nil)
+	if err == nil {
+		cluster := file.GetCluster()
+		if cluster.Spec.Image != rawCluster.Spec.Image {
+			return fmt.Errorf("the cluster image already exists, please uninstall the current cluster and install another version of the cluster image")
+		}
+		return fmt.Errorf("this cluster image has already been installed, please do not repeat the operation")
+	}
+	return nil
+}