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vmsnapshot-admitter.go
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vmsnapshot-admitter.go
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/*
* This file is part of the KubeVirt project
*
* 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.
*
* Copyright 2018 Red Hat, Inc.
*
*/
package admitters
import (
"encoding/json"
"fmt"
"reflect"
admissionv1 "k8s.io/api/admission/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
k8sfield "k8s.io/apimachinery/pkg/util/validation/field"
v1 "kubevirt.io/client-go/api/v1"
snapshotv1 "kubevirt.io/client-go/apis/snapshot/v1alpha1"
"kubevirt.io/client-go/kubecli"
webhookutils "kubevirt.io/kubevirt/pkg/util/webhooks"
virtconfig "kubevirt.io/kubevirt/pkg/virt-config"
)
// VMSnapshotAdmitter validates VirtualMachineSnapshots
type VMSnapshotAdmitter struct {
Config *virtconfig.ClusterConfig
Client kubecli.KubevirtClient
}
// NewVMSnapshotAdmitter creates a VMSnapshotAdmitter
func NewVMSnapshotAdmitter(config *virtconfig.ClusterConfig, client kubecli.KubevirtClient) *VMSnapshotAdmitter {
return &VMSnapshotAdmitter{
Config: config,
Client: client,
}
}
// Admit validates an AdmissionReview
func (admitter *VMSnapshotAdmitter) Admit(ar *admissionv1.AdmissionReview) *admissionv1.AdmissionResponse {
if ar.Request.Resource.Group != snapshotv1.SchemeGroupVersion.Group ||
ar.Request.Resource.Resource != "virtualmachinesnapshots" {
return webhookutils.ToAdmissionResponseError(fmt.Errorf("unexpected resource %+v", ar.Request.Resource))
}
if ar.Request.Operation == admissionv1.Create && !admitter.Config.SnapshotEnabled() {
return webhookutils.ToAdmissionResponseError(fmt.Errorf("snapshot feature gate not enabled"))
}
vmSnapshot := &snapshotv1.VirtualMachineSnapshot{}
// TODO ideally use UniversalDeserializer here
err := json.Unmarshal(ar.Request.Object.Raw, vmSnapshot)
if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
var causes []metav1.StatusCause
switch ar.Request.Operation {
case admissionv1.Create:
sourceField := k8sfield.NewPath("spec", "source")
if vmSnapshot.Spec.Source.APIGroup == nil {
causes = []metav1.StatusCause{
{
Type: metav1.CauseTypeFieldValueNotFound,
Message: "missing apiGroup",
Field: sourceField.Child("apiGroup").String(),
},
}
break
}
switch *vmSnapshot.Spec.Source.APIGroup {
case v1.GroupName:
switch vmSnapshot.Spec.Source.Kind {
case "VirtualMachine":
causes, err = admitter.validateCreateVM(sourceField.Child("name"), ar.Request.Namespace, vmSnapshot.Spec.Source.Name)
if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
default:
causes = []metav1.StatusCause{
{
Type: metav1.CauseTypeFieldValueInvalid,
Message: "invalid kind",
Field: sourceField.Child("kind").String(),
},
}
}
default:
causes = []metav1.StatusCause{
{
Type: metav1.CauseTypeFieldValueInvalid,
Message: "invalid apiGroup",
Field: sourceField.Child("apiGroup").String(),
},
}
}
case admissionv1.Update:
prevObj := &snapshotv1.VirtualMachineSnapshot{}
err = json.Unmarshal(ar.Request.OldObject.Raw, prevObj)
if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
if !reflect.DeepEqual(prevObj.Spec, vmSnapshot.Spec) {
causes = []metav1.StatusCause{
{
Type: metav1.CauseTypeFieldValueInvalid,
Message: "spec in immutable after creation",
Field: k8sfield.NewPath("spec").String(),
},
}
}
default:
return webhookutils.ToAdmissionResponseError(fmt.Errorf("unexpected operation %s", ar.Request.Operation))
}
if len(causes) > 0 {
return webhookutils.ToAdmissionResponse(causes)
}
reviewResponse := admissionv1.AdmissionResponse{
Allowed: true,
}
return &reviewResponse
}
func (admitter *VMSnapshotAdmitter) validateCreateVM(field *k8sfield.Path, namespace, name string) ([]metav1.StatusCause, error) {
_, err := admitter.Client.VirtualMachine(namespace).Get(name, &metav1.GetOptions{})
if errors.IsNotFound(err) {
return []metav1.StatusCause{
{
Type: metav1.CauseTypeFieldValueInvalid,
Message: fmt.Sprintf("VirtualMachine %q does not exist", name),
Field: field.String(),
},
}, nil
}
if err != nil {
return nil, err
}
return []metav1.StatusCause{}, nil
}