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reconciler.go
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reconciler.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package operatingsystemconfig
import (
"context"
"fmt"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
extensionscontroller "github.com/gardener/gardener/extensions/pkg/controller"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
v1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/gardener/gardener/pkg/controllerutils"
reconcilerutils "github.com/gardener/gardener/pkg/controllerutils/reconciler"
)
// reconciler reconciles OperatingSystemConfig resources of Gardener's `extensions.gardener.cloud`
// API group.
type reconciler struct {
actuator Actuator
client client.Client
reader client.Reader
scheme *runtime.Scheme
statusUpdater extensionscontroller.StatusUpdater
}
// NewReconciler creates a new reconcile.Reconciler that reconciles
// OperatingSystemConfig resources of Gardener's `extensions.gardener.cloud` API group.
func NewReconciler(mgr manager.Manager, actuator Actuator) reconcile.Reconciler {
return reconcilerutils.OperationAnnotationWrapper(
mgr,
func() client.Object { return &extensionsv1alpha1.OperatingSystemConfig{} },
&reconciler{
actuator: actuator,
client: mgr.GetClient(),
reader: mgr.GetAPIReader(),
scheme: mgr.GetScheme(),
statusUpdater: extensionscontroller.NewStatusUpdater(mgr.GetClient()),
},
)
}
// Reconcile is the reconciler function that gets executed in case there are new events for the `OperatingSystemConfig`
// resources.
func (r *reconciler) Reconcile(ctx context.Context, request reconcile.Request) (reconcile.Result, error) {
log := logf.FromContext(ctx)
osc := &extensionsv1alpha1.OperatingSystemConfig{}
if err := r.client.Get(ctx, request.NamespacedName, osc); err != nil {
if apierrors.IsNotFound(err) {
log.V(1).Info("Object is gone, stop reconciling")
return reconcile.Result{}, nil
}
return reconcile.Result{}, fmt.Errorf("error retrieving object from store: %w", err)
}
cluster, err := extensionscontroller.GetCluster(ctx, r.client, osc.Namespace)
if err != nil {
return reconcile.Result{}, err
}
if extensionscontroller.IsFailed(cluster) {
log.Info("Skip the reconciliation of OperatingSystemConfig of failed shoot")
return reconcile.Result{}, nil
}
operationType := v1beta1helper.ComputeOperationType(osc.ObjectMeta, osc.Status.LastOperation)
switch {
case extensionscontroller.ShouldSkipOperation(operationType, osc):
return reconcile.Result{}, nil
case operationType == gardencorev1beta1.LastOperationTypeMigrate:
return r.migrate(ctx, log, osc)
case osc.DeletionTimestamp != nil:
return r.delete(ctx, log, osc, cluster != nil && v1beta1helper.ShootNeedsForceDeletion(cluster.Shoot))
case operationType == gardencorev1beta1.LastOperationTypeRestore:
return r.restore(ctx, log, osc)
default:
return r.reconcile(ctx, log, osc, operationType)
}
}
func (r *reconciler) reconcile(
ctx context.Context,
log logr.Logger,
osc *extensionsv1alpha1.OperatingSystemConfig,
operationType gardencorev1beta1.LastOperationType,
) (
reconcile.Result,
error,
) {
if !controllerutil.ContainsFinalizer(osc, FinalizerName) {
log.Info("Adding finalizer")
if err := controllerutils.AddFinalizers(ctx, r.client, osc, FinalizerName); err != nil {
return reconcile.Result{}, fmt.Errorf("failed to add finalizer: %w", err)
}
}
if err := r.statusUpdater.Processing(ctx, log, osc, operationType, "Reconciling the OperatingSystemConfig"); err != nil {
return reconcile.Result{}, err
}
log.Info("Starting the reconciliation of OperatingSystemConfig")
userData, extensionUnits, extensionFiles, err := r.actuator.Reconcile(ctx, log, osc)
if err != nil {
_ = r.statusUpdater.Error(ctx, log, osc, reconcilerutils.ReconcileErrCauseOrErr(err), operationType, "Error reconciling OperatingSystemConfig")
return reconcilerutils.ReconcileErr(err)
}
// For backwards-compatibility, we have to always create a secret since gardenlet expects to find it - even if the
// user data is nil/empty (which should always be the case when purpose=reconcile).
// https://github.com/gardener/gardener/blob/328e10d975c7b6caa5db139badcc42ac8f772d31/pkg/component/extensions/operatingsystemconfig/operatingsystemconfig.go#L257-L259
secret, err := r.reconcileOSCResultSecret(ctx, osc, userData)
if err != nil {
_ = r.statusUpdater.Error(ctx, log, osc, reconcilerutils.ReconcileErrCauseOrErr(err), operationType, "Could not apply secret for generated cloud config")
return reconcilerutils.ReconcileErr(err)
}
patch := client.MergeFrom(osc.DeepCopy())
setOSCStatus(osc, secret, extensionUnits, extensionFiles)
if err := r.client.Status().Patch(ctx, osc, patch); err != nil {
_ = r.statusUpdater.Error(ctx, log, osc, reconcilerutils.ReconcileErrCauseOrErr(err), gardencorev1beta1.LastOperationTypeRestore, "Could not update status")
return reconcilerutils.ReconcileErr(err)
}
if err := r.statusUpdater.Success(ctx, log, osc, operationType, "Successfully reconciled OperatingSystemConfig"); err != nil {
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
func (r *reconciler) restore(
ctx context.Context,
log logr.Logger,
osc *extensionsv1alpha1.OperatingSystemConfig,
) (
reconcile.Result,
error,
) {
if !controllerutil.ContainsFinalizer(osc, FinalizerName) {
log.Info("Adding finalizer")
if err := controllerutils.AddFinalizers(ctx, r.client, osc, FinalizerName); err != nil {
return reconcile.Result{}, fmt.Errorf("failed to add finalizer: %w", err)
}
}
if err := r.statusUpdater.Processing(ctx, log, osc, gardencorev1beta1.LastOperationTypeRestore, "Restoring the OperatingSystemConfig"); err != nil {
return reconcile.Result{}, err
}
log.Info("Starting the restoration of OperatingSystemConfig")
userData, extensionUnits, extensionFiles, err := r.actuator.Restore(ctx, log, osc)
if err != nil {
_ = r.statusUpdater.Error(ctx, log, osc, reconcilerutils.ReconcileErrCauseOrErr(err), gardencorev1beta1.LastOperationTypeRestore, "Error restoring OperatingSystemConfig")
return reconcilerutils.ReconcileErr(err)
}
// For backwards-compatibility, we have to always create a secret since gardenlet expects to find it - even if the
// user data is nil/empty (which should always be the case when purpose=reconcile).
// https://github.com/gardener/gardener/blob/328e10d975c7b6caa5db139badcc42ac8f772d31/pkg/component/extensions/operatingsystemconfig/operatingsystemconfig.go#L257-L259
secret, err := r.reconcileOSCResultSecret(ctx, osc, userData)
if err != nil {
_ = r.statusUpdater.Error(ctx, log, osc, reconcilerutils.ReconcileErrCauseOrErr(err), gardencorev1beta1.LastOperationTypeRestore, "Could not apply secret for generated cloud config")
return reconcilerutils.ReconcileErr(err)
}
patch := client.MergeFrom(osc.DeepCopy())
setOSCStatus(osc, secret, extensionUnits, extensionFiles)
if err := r.client.Status().Patch(ctx, osc, patch); err != nil {
_ = r.statusUpdater.Error(ctx, log, osc, reconcilerutils.ReconcileErrCauseOrErr(err), gardencorev1beta1.LastOperationTypeRestore, "Could not update units and secret ref.")
return reconcilerutils.ReconcileErr(err)
}
if err := r.statusUpdater.Success(ctx, log, osc, gardencorev1beta1.LastOperationTypeRestore, "Successfully restored OperatingSystemConfig"); err != nil {
return reconcile.Result{}, err
}
if err := extensionscontroller.RemoveAnnotation(ctx, r.client, osc, v1beta1constants.GardenerOperation); err != nil {
return reconcile.Result{}, fmt.Errorf("error removing annotation from OperatingSystemConfig: %+v", err)
}
return reconcile.Result{}, nil
}
func (r *reconciler) delete(
ctx context.Context,
log logr.Logger,
osc *extensionsv1alpha1.OperatingSystemConfig,
forceDelete bool,
) (
reconcile.Result,
error,
) {
if !controllerutil.ContainsFinalizer(osc, FinalizerName) {
log.Info("Deleting operating system config causes a no-op as there is no finalizer", "osc", osc.Name)
return reconcile.Result{}, nil
}
if err := r.statusUpdater.Processing(ctx, log, osc, gardencorev1beta1.LastOperationTypeDelete, "Deleting the OperatingSystemConfig"); err != nil {
return reconcile.Result{}, err
}
log.Info("Starting the deletion of OperatingSystemConfig")
var err error
if forceDelete {
err = r.actuator.ForceDelete(ctx, log, osc)
} else {
err = r.actuator.Delete(ctx, log, osc)
}
if err != nil {
_ = r.statusUpdater.Error(ctx, log, osc, reconcilerutils.ReconcileErrCauseOrErr(err), gardencorev1beta1.LastOperationTypeDelete, "Error deleting OperatingSystemConfig")
return reconcilerutils.ReconcileErr(err)
}
if err := r.statusUpdater.Success(ctx, log, osc, gardencorev1beta1.LastOperationTypeDelete, "Successfully deleted OperatingSystemConfig"); err != nil {
return reconcile.Result{}, err
}
if controllerutil.ContainsFinalizer(osc, FinalizerName) {
log.Info("Removing finalizer")
if err := controllerutils.RemoveFinalizers(ctx, r.client, osc, FinalizerName); err != nil {
return reconcile.Result{}, fmt.Errorf("failed to remove finalizer: %w", err)
}
}
return reconcile.Result{}, nil
}
func (r *reconciler) migrate(
ctx context.Context,
log logr.Logger,
osc *extensionsv1alpha1.OperatingSystemConfig,
) (
reconcile.Result,
error,
) {
if !controllerutil.ContainsFinalizer(osc, FinalizerName) {
log.Info("Migrating operating system config causes a no-op as there is no finalizer")
return reconcile.Result{}, nil
}
if err := r.statusUpdater.Processing(ctx, log, osc, gardencorev1beta1.LastOperationTypeMigrate, "Migrating the OperatingSystemConfig"); err != nil {
return reconcile.Result{}, err
}
log.Info("Starting the migration of OperatingSystemConfig")
if err := r.actuator.Migrate(ctx, log, osc); err != nil {
_ = r.statusUpdater.Error(ctx, log, osc, reconcilerutils.ReconcileErrCauseOrErr(err), gardencorev1beta1.LastOperationTypeMigrate, "Error migrating OperatingSystemConfig")
return reconcilerutils.ReconcileErr(err)
}
if err := r.statusUpdater.Success(ctx, log, osc, gardencorev1beta1.LastOperationTypeMigrate, "Successfully migrated OperatingSystemConfig"); err != nil {
return reconcile.Result{}, err
}
log.Info("Removing finalizer", "osc", osc.Name)
if err := controllerutils.RemoveAllFinalizers(ctx, r.client, osc); err != nil {
return reconcile.Result{}, fmt.Errorf("error removing finalizers: %w", err)
}
if err := extensionscontroller.RemoveAnnotation(ctx, r.client, osc, v1beta1constants.GardenerOperation); err != nil {
return reconcile.Result{}, fmt.Errorf("error removing annotation from OperatingSystemConfig: %+v", err)
}
return reconcile.Result{}, nil
}
func (r *reconciler) reconcileOSCResultSecret(ctx context.Context, osc *extensionsv1alpha1.OperatingSystemConfig, userData []byte) (*corev1.Secret, error) {
secret := &corev1.Secret{ObjectMeta: SecretObjectMetaForConfig(osc)}
if _, err := controllerutils.GetAndCreateOrStrategicMergePatch(ctx, r.client, secret, func() error {
if secret.Data == nil {
secret.Data = make(map[string][]byte)
}
secret.Data[extensionsv1alpha1.OperatingSystemConfigSecretDataKey] = userData
return controllerutil.SetControllerReference(osc, secret, r.scheme)
}); err != nil {
return nil, err
}
return secret, nil
}
func setOSCStatus(
osc *extensionsv1alpha1.OperatingSystemConfig,
secret *corev1.Secret,
extensionUnits []extensionsv1alpha1.Unit,
extensionFiles []extensionsv1alpha1.File,
) {
if secret != nil {
osc.Status.CloudConfig = &extensionsv1alpha1.CloudConfig{
SecretRef: corev1.SecretReference{
Name: secret.Name,
Namespace: secret.Namespace,
},
}
}
osc.Status.ExtensionUnits = extensionUnits
osc.Status.ExtensionFiles = extensionFiles
}