API modified to use source; now supports EmptyDirectory

API is now modified to use a Source struct to handle multiple volumes.

Two volume types are supported now, HostDirectory and EmptyDirectory.

pkg/api/validation_test.go

@@ -25,15 +25,16 @@ import (
 
 func TestValidateVolumes(t *testing.T) {
 	successCase := []Volume{
-		{Name: "abc", HostDirectory: &HostDirectory{"/mnt/path1"}},
-		{Name: "123", HostDirectory: &HostDirectory{"/mnt/path2"}},
-		{Name: "abc-123", HostDirectory: &HostDirectory{"/mnt/path3"}},
+		{Name: "abc"},
+		{Name: "123", Source: &VolumeSource{HostDirectory: &HostDirectory{"/mnt/path2"}}},
+		{Name: "abc-123", Source: &VolumeSource{HostDirectory: &HostDirectory{"/mnt/path3"}}},
+		{Name: "empty", Source: &VolumeSource{EmptyDirectory: &EmptyDirectory{}}},
 	}
 	names, errs := validateVolumes(successCase)
 	if len(errs) != 0 {
 		t.Errorf("expected success: %v", errs)
 	}
-	if len(names) != 3 || !names.Has("abc") || !names.Has("123") || !names.Has("abc-123") {
+	if len(names) != 4 || !names.Has("abc") || !names.Has("123") || !names.Has("abc-123") || !names.Has("empty") {
 		t.Errorf("wrong names result: %v", names)
 	}
 
@@ -206,8 +207,8 @@ func TestValidateManifest(t *testing.T) {
 		{
 			Version: "v1beta1",
 			ID:      "abc",
-			Volumes: []Volume{{Name: "vol1", HostDirectory: &HostDirectory{"/mnt/vol1"}},
-				          {Name: "vol2", HostDirectory: &HostDirectory{"/mnt/vol2"}}},
+			Volumes: []Volume{{Name: "vol1", Source: &VolumeSource{HostDirectory: &HostDirectory{"/mnt/vol1"}}},
+			                  {Name: "vol2", Source: &VolumeSource{HostDirectory: &HostDirectory{"/mnt/vol2"}}}},
 			Containers: []Container{
 				{
 					Name:       "abc",