Convert plugins to accept bytes instead of unstruct.

pkg/resource/resource.go

@@ -23,6 +23,7 @@ import (
 	"sigs.k8s.io/kustomize/pkg/ifc"
 	"sigs.k8s.io/kustomize/pkg/resid"
 	"sigs.k8s.io/kustomize/pkg/types"
+	"sigs.k8s.io/yaml"
 )
 
 // Resource is map representation of a Kubernetes API resource object
@@ -56,6 +57,16 @@ func (r *Resource) DeepCopy() *Resource {
 	return rc
 }
 
+// AsYAML returns the resource in Yaml form.
+// Easier to read than JSON.
+func (r *Resource) AsYAML() ([]byte, error) {
+	json, err := r.MarshalJSON()
+	if err != nil {
+		return nil, err
+	}
+	return yaml.JSONToYAML(json)
+}
+
 // Behavior returns the behavior for the resource.
 func (r *Resource) Behavior() types.GenerationBehavior {
 	return r.options.Behavior()

pkg/resource/resource_test.go

@@ -54,6 +54,21 @@ var testDeployment = factory.FromMap(
 
 const deploymentAsString = `{"apiVersion":"apps/v1","kind":"Deployment","metadata":{"name":"pooh"}}`
 
+func TestAsYAML(t *testing.T) {
+	expected := `apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: pooh
+`
+	yaml, err := testDeployment.AsYAML()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(yaml) != expected {
+		t.Fatalf("--- expected\n%s\n--- got\n%s\n", expected, string(yaml))
+	}
+}
+
 func TestResourceString(t *testing.T) {
 	tests := []struct {
 		in *Resource