Addition of ScaleIO Kubernetes Volume Plugin

This commits implements the Kubernetes volume plugin allowing pods to seamlessly access and use data stored on ScaleIO volumes.

pkg/api/validation/validation_test.go

@@ -1968,6 +1968,65 @@ func TestValidateVolumes(t *testing.T) {
 			errtype:  field.ErrorTypeRequired,
 			errfield: "azureDisk.diskURI",
 		},
+		// ScaleIO
+		{
+			name: "valid scaleio volume",
+			vol: api.Volume{
+				Name: "scaleio-volume",
+				VolumeSource: api.VolumeSource{
+					ScaleIO: &api.ScaleIOVolumeSource{
+						Gateway:    "http://abcd/efg",
+						System:     "test-system",
+						VolumeName: "test-vol-1",
+					},
+				},
+			},
+		},
+		{
+			name: "ScaleIO with empty name",
+			vol: api.Volume{
+				Name: "scaleio-volume",
+				VolumeSource: api.VolumeSource{
+					ScaleIO: &api.ScaleIOVolumeSource{
+						Gateway:    "http://abcd/efg",
+						System:     "test-system",
+						VolumeName: "",
+					},
+				},
+			},
+			errtype:  field.ErrorTypeRequired,
+			errfield: "scaleIO.volumeName",
+		},
+		{
+			name: "ScaleIO with empty gateway",
+			vol: api.Volume{
+				Name: "scaleio-volume",
+				VolumeSource: api.VolumeSource{
+					ScaleIO: &api.ScaleIOVolumeSource{
+						Gateway:    "",
+						System:     "test-system",
+						VolumeName: "test-vol-1",
+					},
+				},
+			},
+			errtype:  field.ErrorTypeRequired,
+			errfield: "scaleIO.gateway",
+		},
+		{
+			name: "ScaleIO with empty system",
+			vol: api.Volume{
+				Name: "scaleio-volume",
+				VolumeSource: api.VolumeSource{
+					ScaleIO: &api.ScaleIOVolumeSource{
+						Gateway:    "http://agc/efg/gateway",
+						System:     "",
+						VolumeName: "test-vol-1",
+					},
+				},
+			},
+			errtype:  field.ErrorTypeRequired,
+			errfield: "scaleIO.system",
+		},
 	}
 
 	for i, tc := range testCases {