From 9f15cd2721a90190be3bf83eb9b1cec35ecc5e81 Mon Sep 17 00:00:00 2001
From: Satish Matti <smatti@google.com>
Date: Wed, 6 May 2020 10:37:30 -0700
Subject: [PATCH] Enable pruning of unknown fields for CRDs

---
 pkg/backendconfig/backendconfig.go | 1 +
 pkg/crd/crd.go                     | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/pkg/backendconfig/backendconfig.go b/pkg/backendconfig/backendconfig.go
index f10cd9970e..b093eeffb4 100644
--- a/pkg/backendconfig/backendconfig.go
+++ b/pkg/backendconfig/backendconfig.go
@@ -43,6 +43,7 @@ func CRDMeta() *crd.CRDMeta {
 		"BackendConfigList",
 		"backendconfig",
 		"backendconfigs",
+		"bc",
 	)
 	meta.AddValidationInfo("k8s.io/ingress-gce/pkg/apis/backendconfig/v1.BackendConfig", backendconfigv1.GetOpenAPIDefinitions)
 	return meta
diff --git a/pkg/crd/crd.go b/pkg/crd/crd.go
index ff01761064..2f0d1f4a8b 100644
--- a/pkg/crd/crd.go
+++ b/pkg/crd/crd.go
@@ -27,6 +27,7 @@ import (
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/wait"
+	utilpointer "k8s.io/utils/pointer"
 )
 
 const (
@@ -118,6 +119,9 @@ func crd(meta *CRDMeta) *apiextensionsv1beta1.CustomResourceDefinition {
 			klog.Errorf("Error adding simple validation for %v CRD: %v", meta.kind, err)
 		}
 		crd.Spec.Validation = validationSpec
+		// Drop unknown fields of a CRD resource. Note that this needs be specified
+		// in conjunction with validation spec.
+		crd.Spec.PreserveUnknownFields = utilpointer.BoolPtr(false)
 	}
 	return crd
 }