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restore.go
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restore.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 2020 Red Hat, Inc.
*
*/
package snapshot
import (
"context"
"fmt"
"reflect"
"strings"
"time"
vsv1beta1 "github.com/kubernetes-csi/external-snapshotter/v2/pkg/apis/volumesnapshot/v1beta1"
corev1 "k8s.io/api/core/v1"
storagev1 "k8s.io/api/storage/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
kubevirtv1 "kubevirt.io/api/core/v1"
snapshotv1 "kubevirt.io/api/snapshot/v1alpha1"
"kubevirt.io/client-go/log"
"kubevirt.io/kubevirt/pkg/controller"
)
const (
pvcRestoreAnnotation = "restore.kubevirt.io/name"
populatedForPVCAnnotation = "cdi.kubevirt.io/storage.populatedFor"
lastRestoreAnnotation = "restore.kubevirt.io/lastRestoreUID"
restoreCompleteEvent = "VirtualMachineRestoreComplete"
restoreErrorEvent = "VirtualMachineRestoreError"
)
type restoreTarget interface {
UID() types.UID
Ready() (bool, error)
Reconcile() (bool, error)
Cleanup() error
Own(obj metav1.Object)
UpdateDoneRestore() (bool, error)
UpdateRestoreInProgress() error
}
type vmRestoreTarget struct {
controller *VMRestoreController
vmRestore *snapshotv1.VirtualMachineRestore
vm *kubevirtv1.VirtualMachine
}
var restoreAnnotationsToDelete = []string{
"pv.kubernetes.io",
"volume.beta.kubernetes.io",
"cdi.kubevirt.io",
"volume.kubernetes.io",
}
func restorePVCName(vmRestore *snapshotv1.VirtualMachineRestore, name string) string {
return fmt.Sprintf("restore-%s-%s", vmRestore.UID, name)
}
func restoreDVName(vmRestore *snapshotv1.VirtualMachineRestore, name string) string {
return restorePVCName(vmRestore, name)
}
func vmRestoreProgressing(vmRestore *snapshotv1.VirtualMachineRestore) bool {
return vmRestore.Status == nil || vmRestore.Status.Complete == nil || !*vmRestore.Status.Complete
}
func (ctrl *VMRestoreController) updateVMRestore(vmRestoreIn *snapshotv1.VirtualMachineRestore) (time.Duration, error) {
logger := log.Log.Object(vmRestoreIn)
logger.V(1).Infof("Updating VirtualMachineRestore")
vmRestoreOut := vmRestoreIn.DeepCopy()
if vmRestoreOut.Status == nil {
f := false
vmRestoreOut.Status = &snapshotv1.VirtualMachineRestoreStatus{
Complete: &f,
}
}
target, err := ctrl.getTarget(vmRestoreOut)
if err != nil {
logger.Reason(err).Error("Error getting restore target")
return 0, ctrl.doUpdateError(vmRestoreOut, err)
}
if !vmRestoreProgressing(vmRestoreIn) && target != nil {
//update the vm if Done restore
if updated, err := target.UpdateDoneRestore(); updated || err != nil {
return 0, err
}
return 0, nil
}
if len(vmRestoreOut.OwnerReferences) == 0 {
target.Own(vmRestoreOut)
updateRestoreCondition(vmRestoreOut, newProgressingCondition(corev1.ConditionTrue, "Initializing VirtualMachineRestore"))
updateRestoreCondition(vmRestoreOut, newReadyCondition(corev1.ConditionFalse, "Initializing VirtualMachineRestore"))
}
err = target.UpdateRestoreInProgress()
if err != nil {
return 0, err
}
// let's make sure everything is initialized properly before continuing
if !reflect.DeepEqual(vmRestoreIn, vmRestoreOut) {
return 0, ctrl.doUpdate(vmRestoreIn, vmRestoreOut)
}
var updated bool
updated, err = ctrl.reconcileVolumeRestores(vmRestoreOut, target)
if err != nil {
logger.Reason(err).Error("Error reconciling VolumeRestores")
return 0, ctrl.doUpdateError(vmRestoreIn, err)
}
if !updated {
var ready bool
ready, err = target.Ready()
if err != nil {
logger.Reason(err).Error("Error checking target ready")
return 0, ctrl.doUpdateError(vmRestoreIn, err)
}
if ready {
updated, err = target.Reconcile()
if err != nil {
logger.Reason(err).Error("Error reconciling target")
return 0, ctrl.doUpdateError(vmRestoreIn, err)
}
if !updated {
if err = target.Cleanup(); err != nil {
logger.Reason(err).Error("Error cleaning up")
return 0, ctrl.doUpdateError(vmRestoreIn, err)
}
ctrl.Recorder.Eventf(
vmRestoreOut,
corev1.EventTypeNormal,
restoreCompleteEvent,
"Successfully completed VirtualMachineRestore %s",
vmRestoreOut.Name,
)
t := true
vmRestoreOut.Status.Complete = &t
vmRestoreOut.Status.RestoreTime = currentTime()
updateRestoreCondition(vmRestoreOut, newProgressingCondition(corev1.ConditionFalse, "Operation complete"))
updateRestoreCondition(vmRestoreOut, newReadyCondition(corev1.ConditionTrue, "Operation complete"))
} else {
updateRestoreCondition(vmRestoreOut, newProgressingCondition(corev1.ConditionTrue, "Updating target spec"))
updateRestoreCondition(vmRestoreOut, newReadyCondition(corev1.ConditionFalse, "Waiting for target update"))
}
} else {
reason := "Waiting for target to be ready"
updateRestoreCondition(vmRestoreOut, newProgressingCondition(corev1.ConditionFalse, reason))
updateRestoreCondition(vmRestoreOut, newReadyCondition(corev1.ConditionFalse, reason))
// try again in 5 secs
return 5 * time.Second, ctrl.doUpdate(vmRestoreIn, vmRestoreOut)
}
} else {
updateRestoreCondition(vmRestoreOut, newProgressingCondition(corev1.ConditionTrue, "Creating new PVCs"))
updateRestoreCondition(vmRestoreOut, newReadyCondition(corev1.ConditionFalse, "Waiting for new PVCs"))
}
return 0, ctrl.doUpdate(vmRestoreIn, vmRestoreOut)
}
func (ctrl *VMRestoreController) doUpdateError(restore *snapshotv1.VirtualMachineRestore, err error) error {
ctrl.Recorder.Eventf(
restore,
corev1.EventTypeWarning,
restoreErrorEvent,
"VirtualMachineRestore encountered error %s",
err.Error(),
)
updated := restore.DeepCopy()
updateRestoreCondition(updated, newProgressingCondition(corev1.ConditionFalse, err.Error()))
updateRestoreCondition(updated, newReadyCondition(corev1.ConditionFalse, err.Error()))
if err2 := ctrl.doUpdate(restore, updated); err2 != nil {
return err2
}
return err
}
func (ctrl *VMRestoreController) doUpdate(original, updated *snapshotv1.VirtualMachineRestore) error {
if !reflect.DeepEqual(original, updated) {
if _, err := ctrl.Client.VirtualMachineRestore(updated.Namespace).Update(context.Background(), updated, metav1.UpdateOptions{}); err != nil {
return err
}
}
return nil
}
func (ctrl *VMRestoreController) reconcileVolumeRestores(vmRestore *snapshotv1.VirtualMachineRestore, target restoreTarget) (bool, error) {
content, err := ctrl.getSnapshotContent(vmRestore, target.UID())
if err != nil {
return false, err
}
var restores []snapshotv1.VolumeRestore
for _, vb := range content.Spec.VolumeBackups {
found := false
for _, vr := range vmRestore.Status.Restores {
if vb.VolumeName == vr.VolumeName {
restores = append(restores, vr)
found = true
break
}
}
if !found {
if vb.VolumeSnapshotName == nil {
return false, fmt.Errorf("VolumeSnapshotName missing %+v", vb)
}
vr := snapshotv1.VolumeRestore{
VolumeName: vb.VolumeName,
PersistentVolumeClaimName: restorePVCName(vmRestore, vb.VolumeName),
VolumeSnapshotName: *vb.VolumeSnapshotName,
}
restores = append(restores, vr)
}
}
if !reflect.DeepEqual(vmRestore.Status.Restores, restores) {
if len(vmRestore.Status.Restores) > 0 {
log.Log.Object(vmRestore).Warning("VMRestore in strange state")
}
vmRestore.Status.Restores = restores
return true, nil
}
createdPVC := false
waitingPVC := false
for i, restore := range restores {
pvc, err := ctrl.getPVC(vmRestore.Namespace, restore.PersistentVolumeClaimName)
if err != nil {
return false, err
}
if pvc == nil {
backup := content.Spec.VolumeBackups[i]
if err = ctrl.createRestorePVC(vmRestore, target, backup, restore); err != nil {
return false, err
}
createdPVC = true
} else if pvc.Status.Phase == corev1.ClaimPending {
bindingMode, err := ctrl.getBindingMode(pvc)
if err != nil {
return false, err
}
if bindingMode == nil || *bindingMode == storagev1.VolumeBindingImmediate {
waitingPVC = true
}
} else if pvc.Status.Phase != corev1.ClaimBound {
return false, fmt.Errorf("PVC %s/%s in status %q", pvc.Namespace, pvc.Name, pvc.Status.Phase)
}
}
return createdPVC || waitingPVC, nil
}
func (ctrl *VMRestoreController) getBindingMode(pvc *corev1.PersistentVolumeClaim) (*storagev1.VolumeBindingMode, error) {
if pvc.Spec.StorageClassName == nil {
return nil, nil
}
obj, exists, err := ctrl.StorageClassInformer.GetStore().GetByKey(*pvc.Spec.StorageClassName)
if err != nil {
return nil, err
}
if !exists {
return nil, fmt.Errorf("StorageClass %s does not exist", *pvc.Spec.StorageClassName)
}
sc := obj.(*storagev1.StorageClass).DeepCopy()
return sc.VolumeBindingMode, nil
}
func (t *vmRestoreTarget) UID() types.UID {
return t.vm.UID
}
func (t *vmRestoreTarget) UpdateDoneRestore() (bool, error) {
if t.vm.Status.RestoreInProgress == nil || *t.vm.Status.RestoreInProgress != t.vmRestore.Name {
return false, nil
}
vmCopy := t.vm.DeepCopy()
vmCopy.Status.RestoreInProgress = nil
return true, t.controller.vmStatusUpdater.UpdateStatus(vmCopy)
}
func (t *vmRestoreTarget) UpdateRestoreInProgress() error {
if t.vm.Status.RestoreInProgress != nil && *t.vm.Status.RestoreInProgress != t.vmRestore.Name {
return fmt.Errorf("vm restore %s in progress", *t.vm.Status.RestoreInProgress)
}
vmCopy := t.vm.DeepCopy()
if vmCopy.Status.RestoreInProgress == nil {
vmCopy.Status.RestoreInProgress = &t.vmRestore.Name
// unfortunately, status Updater does not return the updated resource
// but the controller is watching VMs so will get notified
return t.controller.vmStatusUpdater.UpdateStatus(vmCopy)
}
return nil
}
func (t *vmRestoreTarget) Ready() (bool, error) {
log.Log.Object(t.vmRestore).V(3).Info("Checking VM ready")
rs, err := t.vm.RunStrategy()
if err != nil {
return false, err
}
if rs != kubevirtv1.RunStrategyHalted {
return false, fmt.Errorf("invalid RunStrategy %q", rs)
}
vmiKey, err := controller.KeyFunc(t.vm)
if err != nil {
return false, err
}
_, exists, err := t.controller.VMIInformer.GetStore().GetByKey(vmiKey)
if err != nil {
return false, err
}
return !exists, nil
}
func (t *vmRestoreTarget) Reconcile() (bool, error) {
log.Log.Object(t.vmRestore).V(3).Info("Reconciling VM")
restoreID := fmt.Sprintf("%s-%s", t.vmRestore.Name, t.vmRestore.UID)
if lastRestoreID, ok := t.vm.Annotations[lastRestoreAnnotation]; ok && lastRestoreID == restoreID {
return false, nil
}
content, err := t.controller.getSnapshotContent(t.vmRestore, t.UID())
if err != nil {
return false, err
}
snapshotVM := content.Spec.Source.VirtualMachine
if snapshotVM == nil {
return false, fmt.Errorf("unexpected snapshot source")
}
var newTemplates = make([]kubevirtv1.DataVolumeTemplateSpec, len(snapshotVM.Spec.DataVolumeTemplates))
var newVolumes = make([]kubevirtv1.Volume, len(snapshotVM.Spec.Template.Spec.Volumes))
var deletedDataVolumes []string
updatedStatus := false
for i, t := range snapshotVM.Spec.DataVolumeTemplates {
t.DeepCopyInto(&newTemplates[i])
}
for i, v := range snapshotVM.Spec.Template.Spec.Volumes {
v.DeepCopyInto(&newVolumes[i])
}
for j, v := range snapshotVM.Spec.Template.Spec.Volumes {
if v.DataVolume != nil || v.PersistentVolumeClaim != nil {
for k := range t.vmRestore.Status.Restores {
vr := &t.vmRestore.Status.Restores[k]
if vr.VolumeName != v.Name {
continue
}
pvc, err := t.controller.getPVC(t.vmRestore.Namespace, vr.PersistentVolumeClaimName)
if err != nil {
return false, err
}
if pvc == nil {
return false, fmt.Errorf("pvc %s/%s does not exist and should", t.vmRestore.Namespace, vr.PersistentVolumeClaimName)
}
if v.DataVolume != nil {
templateIndex := -1
for i, dvt := range snapshotVM.Spec.DataVolumeTemplates {
if v.DataVolume.Name == dvt.Name {
templateIndex = i
break
}
}
if templateIndex >= 0 {
if vr.DataVolumeName == nil {
updatePVC := pvc.DeepCopy()
dvName := restoreDVName(t.vmRestore, vr.VolumeName)
if updatePVC.Annotations[populatedForPVCAnnotation] != dvName {
if updatePVC.Annotations == nil {
updatePVC.Annotations = make(map[string]string)
}
updatePVC.Annotations[populatedForPVCAnnotation] = dvName
// datavolume will take ownership
updatePVC.OwnerReferences = nil
_, err = t.controller.Client.CoreV1().PersistentVolumeClaims(updatePVC.Namespace).Update(context.Background(), updatePVC, metav1.UpdateOptions{})
if err != nil {
return false, err
}
}
vr.DataVolumeName = &dvName
updatedStatus = true
}
dv := snapshotVM.Spec.DataVolumeTemplates[templateIndex].DeepCopy()
dv.Name = *vr.DataVolumeName
newTemplates[templateIndex] = *dv
nv := v.DeepCopy()
nv.DataVolume.Name = *vr.DataVolumeName
newVolumes[j] = *nv
} else {
// convert to PersistentVolumeClaim volume
nv := kubevirtv1.Volume{
Name: v.Name,
VolumeSource: kubevirtv1.VolumeSource{
PersistentVolumeClaim: &kubevirtv1.PersistentVolumeClaimVolumeSource{
PersistentVolumeClaimVolumeSource: corev1.PersistentVolumeClaimVolumeSource{
ClaimName: vr.PersistentVolumeClaimName,
},
},
},
}
newVolumes[j] = nv
}
} else {
nv := v.DeepCopy()
nv.PersistentVolumeClaim.ClaimName = vr.PersistentVolumeClaimName
newVolumes[j] = *nv
}
}
}
}
if updatedStatus {
// find DataVolumes that will no longer exist
for _, cdv := range t.vm.Spec.DataVolumeTemplates {
found := false
for _, ndv := range newTemplates {
if cdv.Name == ndv.Name {
found = true
break
}
}
if !found {
deletedDataVolumes = append(deletedDataVolumes, cdv.Name)
}
}
t.vmRestore.Status.DeletedDataVolumes = deletedDataVolumes
return true, nil
}
newVM := t.vm.DeepCopy()
newVM.Spec = snapshotVM.Spec
// update Running state in case snapshot was on online VM
if newVM.Spec.RunStrategy != nil {
runStrategyHalted := kubevirtv1.RunStrategyHalted
newVM.Spec.RunStrategy = &runStrategyHalted
} else if newVM.Spec.Running != nil {
running := false
newVM.Spec.Running = &running
}
newVM.Spec.DataVolumeTemplates = newTemplates
newVM.Spec.Template.Spec.Volumes = newVolumes
if newVM.Annotations == nil {
newVM.Annotations = make(map[string]string)
}
newVM.Annotations[lastRestoreAnnotation] = restoreID
_, err = t.controller.Client.VirtualMachine(newVM.Namespace).Update(newVM)
if err != nil {
return false, err
}
return true, nil
}
func (t *vmRestoreTarget) Own(obj metav1.Object) {
b := true
obj.SetOwnerReferences([]metav1.OwnerReference{
{
APIVersion: kubevirtv1.GroupVersion.String(),
Kind: "VirtualMachine",
Name: t.vm.Name,
UID: t.vm.UID,
Controller: &b,
BlockOwnerDeletion: &b,
},
})
}
func (t *vmRestoreTarget) Cleanup() error {
for _, dvName := range t.vmRestore.Status.DeletedDataVolumes {
objKey := cacheKeyFunc(t.vmRestore.Namespace, dvName)
_, exists, err := t.controller.DataVolumeInformer.GetStore().GetByKey(objKey)
if err != nil {
return err
}
if exists {
err = t.controller.Client.CdiClient().CdiV1beta1().DataVolumes(t.vmRestore.Namespace).
Delete(context.Background(), dvName, metav1.DeleteOptions{})
if err != nil {
return err
}
}
}
return nil
}
func (ctrl *VMRestoreController) getSnapshotContent(vmRestore *snapshotv1.VirtualMachineRestore, targetUID types.UID) (*snapshotv1.VirtualMachineSnapshotContent, error) {
objKey := cacheKeyFunc(vmRestore.Namespace, vmRestore.Spec.VirtualMachineSnapshotName)
obj, exists, err := ctrl.VMSnapshotInformer.GetStore().GetByKey(objKey)
if err != nil {
return nil, err
}
if !exists {
return nil, fmt.Errorf("VMSnapshot %s does not exist", objKey)
}
vms := obj.(*snapshotv1.VirtualMachineSnapshot).DeepCopy()
if !vmSnapshotReady(vms) {
return nil, fmt.Errorf("VMSnapshot %s not ready", objKey)
}
if vms.Status.SourceUID == nil || *vms.Status.SourceUID != targetUID {
return nil, fmt.Errorf("VMSnapshot source and restore target differ")
}
if vms.Status.VirtualMachineSnapshotContentName == nil {
return nil, fmt.Errorf("no snapshot content name in %s", objKey)
}
objKey = cacheKeyFunc(vmRestore.Namespace, *vms.Status.VirtualMachineSnapshotContentName)
obj, exists, err = ctrl.VMSnapshotContentInformer.GetStore().GetByKey(objKey)
if err != nil {
return nil, err
}
if !exists {
return nil, fmt.Errorf("VMSnapshotContent %s does not exist", objKey)
}
vmss := obj.(*snapshotv1.VirtualMachineSnapshotContent).DeepCopy()
if !vmSnapshotContentReady(vmss) {
return nil, fmt.Errorf("VMSnapshotContent %s not ready", objKey)
}
return vmss, nil
}
func (ctrl *VMRestoreController) getVM(namespace, name string) (*kubevirtv1.VirtualMachine, error) {
objKey := cacheKeyFunc(namespace, name)
obj, exists, err := ctrl.VMInformer.GetStore().GetByKey(objKey)
if err != nil {
return nil, err
}
if !exists {
return nil, fmt.Errorf("VirtualMachine %s/%s does not exist", namespace, name)
}
return obj.(*kubevirtv1.VirtualMachine).DeepCopy(), nil
}
func (ctrl *VMRestoreController) getPVC(namespace, name string) (*corev1.PersistentVolumeClaim, error) {
objKey := cacheKeyFunc(namespace, name)
obj, exists, err := ctrl.PVCInformer.GetStore().GetByKey(objKey)
if err != nil {
return nil, err
}
if !exists {
return nil, nil
}
return obj.(*corev1.PersistentVolumeClaim).DeepCopy(), nil
}
func (ctrl *VMRestoreController) getTarget(vmRestore *snapshotv1.VirtualMachineRestore) (restoreTarget, error) {
vmRestore.Spec.Target.DeepCopy()
switch vmRestore.Spec.Target.Kind {
case "VirtualMachine":
vm, err := ctrl.getVM(vmRestore.Namespace, vmRestore.Spec.Target.Name)
if err != nil {
return nil, err
}
return &vmRestoreTarget{
controller: ctrl,
vmRestore: vmRestore,
vm: vm,
}, nil
}
return nil, fmt.Errorf("unknown source %+v", vmRestore.Spec.Target)
}
func (ctrl *VMRestoreController) createRestorePVC(
vmRestore *snapshotv1.VirtualMachineRestore,
target restoreTarget,
volumeBackup snapshotv1.VolumeBackup,
volumeRestore snapshotv1.VolumeRestore,
) error {
sourcePVC := volumeBackup.PersistentVolumeClaim.DeepCopy()
pvc := &corev1.PersistentVolumeClaim{
ObjectMeta: metav1.ObjectMeta{
Name: volumeRestore.PersistentVolumeClaimName,
Labels: sourcePVC.Labels,
Annotations: sourcePVC.Annotations,
},
Spec: sourcePVC.Spec,
}
if volumeBackup.VolumeSnapshotName == nil {
log.Log.Errorf("VolumeSnapshot name missing %+v", volumeBackup)
return fmt.Errorf("missing VolumeSnapshot name")
}
if pvc.Annotations == nil {
pvc.Annotations = make(map[string]string)
}
for _, prefix := range restoreAnnotationsToDelete {
for anno := range pvc.Annotations {
if strings.HasPrefix(anno, prefix) {
delete(pvc.Annotations, anno)
}
}
}
pvc.Annotations[pvcRestoreAnnotation] = vmRestore.Name
apiGroup := vsv1beta1.GroupName
pvc.Spec.DataSource = &corev1.TypedLocalObjectReference{
APIGroup: &apiGroup,
Kind: "VolumeSnapshot",
Name: *volumeBackup.VolumeSnapshotName,
}
pvc.Spec.VolumeName = ""
target.Own(pvc)
_, err := ctrl.Client.CoreV1().PersistentVolumeClaims(vmRestore.Namespace).Create(context.Background(), pvc, metav1.CreateOptions{})
if err != nil {
return err
}
return nil
}
func updateRestoreCondition(r *snapshotv1.VirtualMachineRestore, c snapshotv1.Condition) {
r.Status.Conditions = updateCondition(r.Status.Conditions, c, true)
}