update from to clone for copying existing resource

definitions/install.yaml

@@ -110,7 +110,7 @@ spec:
                         type: string
                       namespace:
                         type: string
-                      from: 
+                      clone: 
                         type: object
                         required:
                         - namespace

pkg/apis/policy/v1alpha1/types.go

@@ -65,12 +65,12 @@ type Generation struct {
 	Name      string      `json:"name"`
 	Namespace string      `json:"namespace"`
 	Data      interface{} `json:"data"`
-	From      *CopyFrom   `json:"from"`
+	Clone     *CloneFrom  `json:"clone"`
 }
 
-// CopyFrom - location of a Secret or a ConfigMap
+// CloneFrom - location of a Secret or a ConfigMap
 // which will be used as source when applying 'generate'
-type CopyFrom struct {
+type CloneFrom struct {
 	Namespace string `json:"namespace"`
 	Name      string `json:"name"`
 }

pkg/apis/policy/v1alpha1/utils.go

@@ -64,8 +64,11 @@ func (pp *Patch) Validate() error {
 
 // Validate returns error if generator is configured incompletely
 func (pcg *Generation) Validate() error {
-	if pcg.Data == nil && pcg.From == nil {
-		return fmt.Errorf("Neither Data nor CopyFrom (source) of %s is specified", pcg.Kind)
+	if pcg.Data == nil && pcg.Clone == nil {
+		return fmt.Errorf("Neither data nor clone (source) of %s is specified", pcg.Kind)
+	}
+	if pcg.Data != nil && pcg.Clone != nil {
+		return fmt.Errorf("Both data nor clone (source) of %s are specified", pcg.Kind)
 	}
 	return nil
 }

pkg/dclient/client.go

@@ -202,9 +202,6 @@ func keyExist(data map[string]interface{}, key string) (ok bool) {
 // support mode 'data' -> create resource
 // To-Do: support 'from' -> copy/clone the resource
 func (c *Client) GenerateResource(generator types.Generation, namespace string) error {
-	if generator.Data != nil && generator.From != nil {
-		return errors.New("generate only supports on the modes data or from")
-	}
 	var err error
 	rGVR := c.getGVRFromKind(generator.Kind)
 	resource := &unstructured.Unstructured{}
@@ -222,9 +219,9 @@ func (c *Client) GenerateResource(generator types.Generation, namespace string)
 			return errors.New("mandatory keys not defined")
 		}
 	}
-	// from -> create new resource
-	if generator.From != nil {
-		resource, err = c.GetResource(rGVR.Resource, generator.From.Namespace, generator.From.Name)
+	// clone -> copy from existing resource
+	if generator.Clone != nil {
+		resource, err = c.GetResource(rGVR.Resource, generator.Clone.Namespace, generator.Clone.Name)
 		if err != nil {
 			return err
 		}