github.com/google/cloudprober@v0.11.3/common/metadata/metadata.go (about)

     1  // Copyright 2021 The Cloudprober 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  /*
    16  Package metadata implements metadata related utilities.
    17  */
    18  package metadata
    19  
    20  import (
    21  	"io/ioutil"
    22  	"os"
    23  )
    24  
    25  // IsKubernetes return true if running on Kubernetes.
    26  // It uses the environment variable KUBERNETES_SERVICE_HOST to decide if we
    27  // we are running Kubernetes.
    28  func IsKubernetes() bool {
    29  	return os.Getenv("KUBERNETES_SERVICE_HOST") != ""
    30  }
    31  
    32  // KubernetesNamespace returns the Kubernetes namespace. It returns an empty
    33  // string if there is an error in retrieving the namespace.
    34  func KubernetesNamespace() string {
    35  	namespaceBytes, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace")
    36  	if err == nil {
    37  		return string(namespaceBytes)
    38  	}
    39  	return ""
    40  }