Introduce subPath in VolumeMount

test/e2e/host_path.go

@@ -88,6 +88,37 @@ var _ = framework.KubeDescribe("hostPath", func() {
 		}, namespace.Name,
 		)
 	})
+
+	It("should support subPath [Conformance]", func() {
+		volumePath := "/test-volume"
+		subPath := "sub-path"
+		fileName := "test-file"
+		retryDuration := 180
+
+		filePathInWriter := path.Join(volumePath, fileName)
+		filePathInReader := path.Join(volumePath, subPath, fileName)
+
+		source := &api.HostPathVolumeSource{
+			Path: "/tmp",
+		}
+		pod := testPodWithHostVol(volumePath, source)
+		// Write the file in the subPath from container 0
+		container := &pod.Spec.Containers[0]
+		container.VolumeMounts[0].SubPath = subPath
+		container.Args = []string{
+			fmt.Sprintf("--new_file_0644=%v", filePathInWriter),
+			fmt.Sprintf("--file_mode=%v", filePathInWriter),
+		}
+		// Read it from outside the subPath from container 1
+		pod.Spec.Containers[1].Args = []string{
+			fmt.Sprintf("--file_content_in_loop=%v", filePathInReader),
+			fmt.Sprintf("--retry_time=%d", retryDuration),
+		}
+
+		framework.TestContainerOutput("hostPath subPath", c, pod, 1, []string{
+			"content of file \"" + filePathInReader + "\": mount-tester new file",
+		}, namespace.Name)
+	})
 })
 
 //These constants are borrowed from the other test.