istio.io/istio@v0.0.0-20240520182934-d79c90f27776/istioctl/pkg/multicluster/cluster.go (about)

     1  // Copyright Istio Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package multicluster
    16  
    17  import (
    18  	"context"
    19  
    20  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    21  	"k8s.io/apimachinery/pkg/types"
    22  	"k8s.io/client-go/kubernetes"
    23  )
    24  
    25  // Use UUID of kube-system Namespace as unique identifier for cluster.
    26  // (see https://docs.google.com/document/d/1F__vEKeI41P7PPUCMM9PVPYY34pyrvQI5rbTJVnS5c4)
    27  func clusterUID(client kubernetes.Interface) (types.UID, error) {
    28  	kubeSystem, err := client.CoreV1().Namespaces().Get(context.TODO(), "kube-system", metav1.GetOptions{})
    29  	if err != nil {
    30  		return "", err
    31  	}
    32  	return kubeSystem.UID, nil
    33  }