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mutator.go
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mutator.go
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// Copyright (c) 2021 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package machinepod
import (
"context"
"fmt"
corev1 "k8s.io/api/core/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
)
type mutator struct {
client client.Client
}
func (m *mutator) InjectClient(c client.Client) error {
m.client = c
return nil
}
func (m *mutator) Mutate(ctx context.Context, newObj, oldObj client.Object) error {
if oldObj != nil {
// This is basically a hack - ideally, we would like the mutating webhook configuration to only react for CREATE
// operations. However, currently both "CREATE" and "UPDATE" are hard-coded in the extensions library.
return nil
}
pod, ok := newObj.(*corev1.Pod)
if !ok {
return fmt.Errorf("unexpected object, got %T wanted *corev1.Pod", newObj)
}
service := &corev1.Service{}
if err := m.client.Get(ctx, client.ObjectKey{Namespace: "gardener-extension-provider-local-coredns", Name: "coredns"}, service); err != nil {
return err
}
pod.Spec.DNSPolicy = corev1.DNSNone
pod.Spec.DNSConfig = &corev1.PodDNSConfig{Nameservers: []string{service.Spec.ClusterIP}}
return nil
}