1/*
2Copyright 2019 The Kubernetes Authors.
3
4Licensed under the Apache License, Version 2.0 (the "License");
5you may not use this file except in compliance with the License.
6You may obtain a copy of the License at
7
8    http://www.apache.org/licenses/LICENSE-2.0
9
10Unless required by applicable law or agreed to in writing, software
11distributed under the License is distributed on an "AS IS" BASIS,
12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13See the License for the specific language governing permissions and
14limitations under the License.
15*/
16
17package util
18
19import (
20	utilfeature "k8s.io/apiserver/pkg/util/feature"
21	"k8s.io/kubernetes/pkg/apis/scheduling"
22	"k8s.io/kubernetes/pkg/features"
23)
24
25// DropDisabledFields removes disabled fields from the PriorityClass object.
26func DropDisabledFields(class, oldClass *scheduling.PriorityClass) {
27	if !utilfeature.DefaultFeatureGate.Enabled(features.NonPreemptingPriority) && !preemptingPriorityInUse(oldClass) {
28		class.PreemptionPolicy = nil
29	}
30}
31
32func preemptingPriorityInUse(oldClass *scheduling.PriorityClass) bool {
33	if oldClass == nil {
34		return false
35	}
36	if oldClass.PreemptionPolicy != nil {
37		return true
38	}
39	return false
40}
41