add origin annotation for resources generated by generators (#4341)

* add origin annotation for resources generated by builtin and custom generators

* decouple origin data from generator data and account for inline generators

api/resource/origin.go

@@ -14,8 +14,9 @@ import (
 // Origin retains information about where resources in the output
 // of `kustomize build` originated from
 type Origin struct {
-	// Path is the path to the resource, rooted from the directory upon
-	// which `kustomize build` was invoked
+	// Path is the path to the resource. If a local resource, this path is
+	// rooted from the directory upon which `kustomize build` was invoked. If a
+	// remote resource, this path is rooted from the root of the remote repo.
 	Path string `json:"path,omitempty" yaml:"path,omitempty"`
 
 	// Repo is the remote repository that the resource originated from if it is
@@ -25,6 +26,16 @@ type Origin struct {
 	// Ref is the ref of the remote repository that the resource originated from
 	// if it is not from a local file
 	Ref string `json:"ref,omitempty" yaml:"ref,omitempty"`
+
+	// The following fields only apply to resources that have been
+	// generated by fields other than the `resources` field.
+
+	// ConfiguredIn is the file path to the generator config that created the
+	// resource
+	ConfiguredIn string `json:"configuredIn,omitempty" yaml:"configuredIn,omitempty"`
+
+	// ConfiguredBy is the ObjectReference of the generator config
+	ConfiguredBy kyaml.ResourceIdentifier `json:"configuredBy,omitempty" yaml:"configuredBy,omitempty"`
 }
 
 // Copy returns a copy of origin
@@ -55,3 +66,29 @@ func (origin *Origin) String() (string, error) {
 	anno, err := kyaml.Marshal(origin)
 	return string(anno), err
 }
+
+func OriginFromCustomPlugin(res *Resource) (*Origin, error) {
+	origin, err := res.GetOrigin()
+	if err != nil {
+		return nil, err
+	}
+	var result *Origin
+	if origin != nil {
+		result = &Origin{
+			Repo:         origin.Repo,
+			Ref:          origin.Ref,
+			ConfiguredIn: origin.Path,
+			ConfiguredBy: kyaml.ResourceIdentifier{
+				TypeMeta: kyaml.TypeMeta{
+					APIVersion: res.GetApiVersion(),
+					Kind:       res.GetKind(),
+				},
+				NameMeta: kyaml.NameMeta{
+					Name:      res.GetName(),
+					Namespace: res.GetNamespace(),
+				},
+			},
+		}
+	}
+	return result, nil
+}