/
vmrestore-admitter.go
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/
vmrestore-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 (
"context"
"encoding/json"
"fmt"
"strings"
admissionv1 "k8s.io/api/admission/v1"
"k8s.io/apimachinery/pkg/api/equality"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
k8sfield "k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/client-go/tools/cache"
"kubevirt.io/api/core"
v1 "kubevirt.io/api/core/v1"
snapshotv1 "kubevirt.io/api/snapshot/v1alpha1"
"kubevirt.io/client-go/kubecli"
webhookutils "kubevirt.io/kubevirt/pkg/util/webhooks"
virtconfig "kubevirt.io/kubevirt/pkg/virt-config"
)
// VMRestoreAdmitter validates VirtualMachineRestores
type VMRestoreAdmitter struct {
Config *virtconfig.ClusterConfig
Client kubecli.KubevirtClient
VMRestoreInformer cache.SharedIndexInformer
}
// NewVMRestoreAdmitter creates a VMRestoreAdmitter
func NewVMRestoreAdmitter(config *virtconfig.ClusterConfig, client kubecli.KubevirtClient, vmRestoreInformer cache.SharedIndexInformer) *VMRestoreAdmitter {
return &VMRestoreAdmitter{
Config: config,
Client: client,
VMRestoreInformer: vmRestoreInformer,
}
}
// Admit validates an AdmissionReview
func (admitter *VMRestoreAdmitter) Admit(ar *admissionv1.AdmissionReview) *admissionv1.AdmissionResponse {
if ar.Request.Resource.Group != snapshotv1.SchemeGroupVersion.Group ||
ar.Request.Resource.Resource != "virtualmachinerestores" {
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/Restore feature gate not enabled"))
}
vmRestore := &snapshotv1.VirtualMachineRestore{}
// TODO ideally use UniversalDeserializer here
err := json.Unmarshal(ar.Request.Object.Raw, vmRestore)
if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
var causes []metav1.StatusCause
var targetVMExists bool
switch ar.Request.Operation {
case admissionv1.Create:
var targetUID *types.UID
targetField := k8sfield.NewPath("spec", "target")
if vmRestore.Spec.Target.APIGroup == nil {
causes = []metav1.StatusCause{
{
Type: metav1.CauseTypeFieldValueNotFound,
Message: "missing apiGroup",
Field: targetField.Child("apiGroup").String(),
},
}
} else {
switch *vmRestore.Spec.Target.APIGroup {
case core.GroupName:
switch vmRestore.Spec.Target.Kind {
case "VirtualMachine":
causes, targetUID, targetVMExists, err = admitter.validateCreateVM(k8sfield.NewPath("spec"), vmRestore)
if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
default:
causes = []metav1.StatusCause{
{
Type: metav1.CauseTypeFieldValueInvalid,
Message: "invalid kind",
Field: targetField.Child("kind").String(),
},
}
}
default:
causes = []metav1.StatusCause{
{
Type: metav1.CauseTypeFieldValueInvalid,
Message: "invalid apiGroup",
Field: targetField.Child("apiGroup").String(),
},
}
}
}
snapshotCauses, err := admitter.validateSnapshot(
k8sfield.NewPath("spec", "virtualMachineSnapshotName"),
ar.Request.Namespace,
vmRestore.Spec.VirtualMachineSnapshotName,
targetUID,
targetVMExists,
)
if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
objects, err := admitter.VMRestoreInformer.GetIndexer().ByIndex(cache.NamespaceIndex, ar.Request.Namespace)
if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
for _, obj := range objects {
r := obj.(*snapshotv1.VirtualMachineRestore)
if equality.Semantic.DeepEqual(r.Spec.Target, vmRestore.Spec.Target) &&
(r.Status == nil || r.Status.Complete == nil || !*r.Status.Complete) {
cause := metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Message: fmt.Sprintf("VirtualMachineRestore %q in progress", r.Name),
Field: targetField.String(),
}
causes = append(causes, cause)
}
}
causes = append(causes, snapshotCauses...)
case admissionv1.Update:
prevObj := &snapshotv1.VirtualMachineRestore{}
err = json.Unmarshal(ar.Request.OldObject.Raw, prevObj)
if err != nil {
return webhookutils.ToAdmissionResponseError(err)
}
if !equality.Semantic.DeepEqual(prevObj.Spec, vmRestore.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 *VMRestoreAdmitter) validateCreateVM(field *k8sfield.Path, vmRestore *snapshotv1.VirtualMachineRestore) (causes []metav1.StatusCause, uid *types.UID, targetVMExists bool, err error) {
vmName := vmRestore.Spec.Target.Name
namespace := vmRestore.Namespace
causes = admitter.validatePatches(vmRestore.Spec.Patches, field.Child("patches"))
vm, err := admitter.Client.VirtualMachine(namespace).Get(context.Background(), vmName, &metav1.GetOptions{})
if errors.IsNotFound(err) {
// If the target VM does not exist it would be automatically created by the restore controller
return nil, nil, false, nil
}
if err != nil {
return nil, nil, false, err
}
rs, err := vm.RunStrategy()
if err != nil {
return nil, nil, true, err
}
if rs != v1.RunStrategyHalted {
var cause metav1.StatusCause
targetField := field.Child("target")
if vm.Spec.Running != nil && *vm.Spec.Running {
cause = metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Message: fmt.Sprintf("VirtualMachine %q is not stopped", vmName),
Field: targetField.String(),
}
} else {
cause = metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Message: fmt.Sprintf("VirtualMachine %q run strategy has to be %s", vmName, v1.RunStrategyHalted),
Field: targetField.String(),
}
}
causes = append(causes, cause)
}
return causes, &vm.UID, true, nil
}
func (admitter *VMRestoreAdmitter) validatePatches(patches []string, field *k8sfield.Path) (causes []metav1.StatusCause) {
// Validate patches are either on labels/annotations or on elements under "/spec/" path only
for _, patch := range patches {
for _, patchKeyValue := range strings.Split(strings.Trim(patch, "{}"), ",") {
// For example, if the original patch is {"op": "replace", "path": "/metadata/name", "value": "someValue"}
// now we're iterating on [`"op": "replace"`, `"path": "/metadata/name"`, `"value": "someValue"`]
keyValSlice := strings.Split(patchKeyValue, ":")
if len(keyValSlice) != 2 {
causes = append(causes, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Message: fmt.Sprintf(`patch format is not valid - one ":" expected in a single key-value json patch: %s`, patchKeyValue),
Field: field.String(),
})
continue
}
key := strings.TrimSpace(keyValSlice[0])
value := strings.TrimSpace(keyValSlice[1])
if key == `"path"` {
if strings.HasPrefix(value, `"/metadata/labels/`) || strings.HasPrefix(value, `"/metadata/annotations/`) {
continue
}
if !strings.HasPrefix(value, `"/spec/`) {
causes = append(causes, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Message: fmt.Sprintf("patching is valid only for elements under /spec/ only: %s", patchKeyValue),
Field: field.String(),
})
}
}
}
}
return causes
}
func (admitter *VMRestoreAdmitter) validateSnapshot(field *k8sfield.Path, namespace, name string, targetUID *types.UID, targetVMExists bool) ([]metav1.StatusCause, error) {
snapshot, err := admitter.Client.VirtualMachineSnapshot(namespace).Get(context.Background(), name, metav1.GetOptions{})
if errors.IsNotFound(err) {
return []metav1.StatusCause{
{
Type: metav1.CauseTypeFieldValueInvalid,
Message: fmt.Sprintf("VirtualMachineSnapshot %q does not exist", name),
Field: field.String(),
},
}, nil
}
if err != nil {
return nil, err
}
var causes []metav1.StatusCause
if snapshot.Status != nil && snapshot.Status.Phase == snapshotv1.Failed {
cause := metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Message: fmt.Sprintf("VirtualMachineSnapshot %q has failed and is invalid to use", name),
Field: field.String(),
}
causes = append(causes, cause)
}
if snapshot.Status == nil || snapshot.Status.ReadyToUse == nil || !*snapshot.Status.ReadyToUse {
cause := metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Message: fmt.Sprintf("VirtualMachineSnapshot %q is not ready to use", name),
Field: field.String(),
}
causes = append(causes, cause)
}
sourceTargetVmsAreDifferent := targetUID != nil && snapshot.Status != nil && snapshot.Status.SourceUID != nil && *targetUID != *snapshot.Status.SourceUID
if sourceTargetVmsAreDifferent && targetVMExists {
cause := metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Message: fmt.Sprintf("when shapsnot source and restore target VMs are different - target VM must not exist"),
Field: field.String(),
}
causes = append(causes, cause)
}
return causes, nil
}