mirror of https://github.com/k3s-io/k3s
128 lines
3.4 KiB
Go
128 lines
3.4 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package storageobjectinuseprotection
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import (
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"io"
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"k8s.io/klog"
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"k8s.io/apiserver/pkg/admission"
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"k8s.io/apiserver/pkg/util/feature"
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api "k8s.io/kubernetes/pkg/apis/core"
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"k8s.io/kubernetes/pkg/features"
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volumeutil "k8s.io/kubernetes/pkg/volume/util"
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)
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const (
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// PluginName is the name of this admission controller plugin
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PluginName = "StorageObjectInUseProtection"
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)
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// Register registers a plugin
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func Register(plugins *admission.Plugins) {
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plugins.Register(PluginName, func(config io.Reader) (admission.Interface, error) {
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plugin := newPlugin()
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return plugin, nil
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})
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}
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// storageProtectionPlugin holds state for and implements the admission plugin.
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type storageProtectionPlugin struct {
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*admission.Handler
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}
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var _ admission.Interface = &storageProtectionPlugin{}
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// newPlugin creates a new admission plugin.
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func newPlugin() *storageProtectionPlugin {
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return &storageProtectionPlugin{
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Handler: admission.NewHandler(admission.Create),
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}
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}
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var (
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pvResource = api.Resource("persistentvolumes")
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pvcResource = api.Resource("persistentvolumeclaims")
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)
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// Admit sets finalizer on all PVCs(PVs). The finalizer is removed by
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// PVCProtectionController(PVProtectionController) when it's not referenced.
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//
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// This prevents users from deleting a PVC that's used by a running pod.
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// This also prevents admin from deleting a PV that's bound by a PVC
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func (c *storageProtectionPlugin) Admit(a admission.Attributes, o admission.ObjectInterfaces) error {
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if !feature.DefaultFeatureGate.Enabled(features.StorageObjectInUseProtection) {
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return nil
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}
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switch a.GetResource().GroupResource() {
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case pvResource:
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return c.admitPV(a)
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case pvcResource:
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return c.admitPVC(a)
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default:
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return nil
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}
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}
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func (c *storageProtectionPlugin) admitPV(a admission.Attributes) error {
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if len(a.GetSubresource()) != 0 {
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return nil
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}
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pv, ok := a.GetObject().(*api.PersistentVolume)
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// if we can't convert the obj to PV, just return
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if !ok {
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return nil
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}
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for _, f := range pv.Finalizers {
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if f == volumeutil.PVProtectionFinalizer {
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// Finalizer is already present, nothing to do
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return nil
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}
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}
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klog.V(4).Infof("adding PV protection finalizer to %s", pv.Name)
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pv.Finalizers = append(pv.Finalizers, volumeutil.PVProtectionFinalizer)
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return nil
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}
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func (c *storageProtectionPlugin) admitPVC(a admission.Attributes) error {
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if len(a.GetSubresource()) != 0 {
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return nil
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}
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pvc, ok := a.GetObject().(*api.PersistentVolumeClaim)
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// if we can't convert the obj to PVC, just return
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if !ok {
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return nil
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}
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for _, f := range pvc.Finalizers {
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if f == volumeutil.PVCProtectionFinalizer {
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// Finalizer is already present, nothing to do
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return nil
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}
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}
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klog.V(4).Infof("adding PVC protection finalizer to %s/%s", pvc.Namespace, pvc.Name)
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pvc.Finalizers = append(pvc.Finalizers, volumeutil.PVCProtectionFinalizer)
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return nil
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}
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