Merge pull request #1316 from brendandburns/namespace

Add a helper method to obtain the namespace of a pod.

Author: k8s-ci-robot

util/src/main/java/io/kubernetes/client/util/Config.java

@@ -32,6 +32,7 @@ public class Config {
   public static final String SERVICEACCOUNT_ROOT = "/var/run/secrets/kubernetes.io/serviceaccount";
   public static final String SERVICEACCOUNT_CA_PATH = SERVICEACCOUNT_ROOT + "/ca.crt";
   public static final String SERVICEACCOUNT_TOKEN_PATH = SERVICEACCOUNT_ROOT + "/token";
+  public static final String SERVICEACCOUNT_NAMESPACE_PATH = SERVICEACCOUNT_ROOT + "/namespace";
   public static final String ENV_KUBECONFIG = "KUBECONFIG";
   public static final String ENV_SERVICE_HOST = "KUBERNETES_SERVICE_HOST";
   public static final String ENV_SERVICE_PORT = "KUBERNETES_SERVICE_PORT";

util/src/main/java/io/kubernetes/client/util/Namespaces.java

@@ -12,10 +12,21 @@
 */
 package io.kubernetes.client.util;
 
+import com.google.common.io.Files;
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.Charset;
+
 /** Namespaces provides a set of helpers for operating namespaces. */
 public class Namespaces {
 
   public static final String NAMESPACE_DEFAULT = "default";
 
   public static final String NAMESPACE_KUBESYSTEM = "kube-system";
+
+  public static String getPodNamespace() throws IOException {
+    return Files.asCharSource(
+            new File(Config.SERVICEACCOUNT_NAMESPACE_PATH), Charset.defaultCharset())
+        .read();
+  }
 }