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admission.go
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admission.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 resourcereferencemanager
import (
"context"
"errors"
"fmt"
"io"
"reflect"
"strings"
"sync"
"time"
"github.com/hashicorp/go-multierror"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/api/equality"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apiserver/pkg/admission"
"k8s.io/apiserver/pkg/authorization/authorizer"
"k8s.io/client-go/dynamic"
kubeinformers "k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
kubecorev1listers "k8s.io/client-go/listers/core/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/gardener/gardener/pkg/apis/core"
"github.com/gardener/gardener/pkg/apis/core/helper"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
admissioninitializer "github.com/gardener/gardener/pkg/apiserver/admission/initializer"
"github.com/gardener/gardener/pkg/client/core/clientset/versioned"
gardencoreinformers "github.com/gardener/gardener/pkg/client/core/informers/externalversions"
gardencorev1beta1listers "github.com/gardener/gardener/pkg/client/core/listers/core/v1beta1"
kubernetesclient "github.com/gardener/gardener/pkg/client/kubernetes"
plugin "github.com/gardener/gardener/plugin/pkg"
"github.com/gardener/gardener/plugin/pkg/utils"
)
// Register registers a plugin.
func Register(plugins *admission.Plugins) {
plugins.Register(plugin.PluginNameResourceReferenceManager, func(_ io.Reader) (admission.Interface, error) {
return New()
})
}
// ReferenceManager contains listers and admission handler.
type ReferenceManager struct {
*admission.Handler
gardenCoreClient versioned.Interface
kubeClient kubernetes.Interface
dynamicClient dynamic.Interface
authorizer authorizer.Authorizer
secretLister kubecorev1listers.SecretLister
configMapLister kubecorev1listers.ConfigMapLister
backupBucketLister gardencorev1beta1listers.BackupBucketLister
cloudProfileLister gardencorev1beta1listers.CloudProfileLister
seedLister gardencorev1beta1listers.SeedLister
shootLister gardencorev1beta1listers.ShootLister
secretBindingLister gardencorev1beta1listers.SecretBindingLister
projectLister gardencorev1beta1listers.ProjectLister
quotaLister gardencorev1beta1listers.QuotaLister
controllerDeploymentLister gardencorev1beta1listers.ControllerDeploymentLister
exposureClassLister gardencorev1beta1listers.ExposureClassLister
readyFunc admission.ReadyFunc
}
var (
_ = admissioninitializer.WantsCoreInformerFactory(&ReferenceManager{})
_ = admissioninitializer.WantsKubeInformerFactory(&ReferenceManager{})
_ = admissioninitializer.WantsCoreClientSet(&ReferenceManager{})
_ = admissioninitializer.WantsKubeClientset(&ReferenceManager{})
_ = admissioninitializer.WantsDynamicClient(&ReferenceManager{})
_ = admissioninitializer.WantsAuthorizer(&ReferenceManager{})
readyFuncs []admission.ReadyFunc
// MissingSecretWait is the time how long to wait for a missing secret before re-checking the cache
// (and then doing a live lookup).
MissingSecretWait = 50 * time.Millisecond
)
// New creates a new ReferenceManager admission plugin.
func New() (*ReferenceManager, error) {
return &ReferenceManager{
Handler: admission.NewHandler(admission.Create, admission.Update, admission.Delete),
}, nil
}
// AssignReadyFunc assigns the ready function to the admission handler.
func (r *ReferenceManager) AssignReadyFunc(f admission.ReadyFunc) {
r.readyFunc = f
r.SetReadyFunc(f)
}
// SetAuthorizer gets the authorizer.
func (r *ReferenceManager) SetAuthorizer(authorizer authorizer.Authorizer) {
r.authorizer = authorizer
}
// SetCoreInformerFactory gets Lister from SharedInformerFactory.
func (r *ReferenceManager) SetCoreInformerFactory(f gardencoreinformers.SharedInformerFactory) {
seedInformer := f.Core().V1beta1().Seeds()
r.seedLister = seedInformer.Lister()
shootInformer := f.Core().V1beta1().Shoots()
r.shootLister = shootInformer.Lister()
backupBucketInformer := f.Core().V1beta1().BackupBuckets()
r.backupBucketLister = backupBucketInformer.Lister()
cloudProfileInformer := f.Core().V1beta1().CloudProfiles()
r.cloudProfileLister = cloudProfileInformer.Lister()
secretBindingInformer := f.Core().V1beta1().SecretBindings()
r.secretBindingLister = secretBindingInformer.Lister()
quotaInformer := f.Core().V1beta1().Quotas()
r.quotaLister = quotaInformer.Lister()
projectInformer := f.Core().V1beta1().Projects()
r.projectLister = projectInformer.Lister()
controllerDeploymentInformer := f.Core().V1beta1().ControllerDeployments()
r.controllerDeploymentLister = controllerDeploymentInformer.Lister()
exposureClassInformer := f.Core().V1beta1().ExposureClasses()
r.exposureClassLister = exposureClassInformer.Lister()
readyFuncs = append(readyFuncs,
seedInformer.Informer().HasSynced,
shootInformer.Informer().HasSynced,
backupBucketInformer.Informer().HasSynced,
cloudProfileInformer.Informer().HasSynced,
secretBindingInformer.Informer().HasSynced,
quotaInformer.Informer().HasSynced,
projectInformer.Informer().HasSynced,
controllerDeploymentInformer.Informer().HasSynced,
exposureClassInformer.Informer().HasSynced)
}
// SetKubeInformerFactory gets Lister from SharedInformerFactory.
func (r *ReferenceManager) SetKubeInformerFactory(f kubeinformers.SharedInformerFactory) {
secretInformer := f.Core().V1().Secrets()
r.secretLister = secretInformer.Lister()
configMapInformer := f.Core().V1().ConfigMaps()
r.configMapLister = configMapInformer.Lister()
readyFuncs = append(readyFuncs, secretInformer.Informer().HasSynced, configMapInformer.Informer().HasSynced)
}
// SetCoreClientSet sets the Gardener client.
func (r *ReferenceManager) SetCoreClientSet(c versioned.Interface) {
r.gardenCoreClient = c
}
// SetKubeClientset sets the Kubernetes client.
func (r *ReferenceManager) SetKubeClientset(c kubernetes.Interface) {
r.kubeClient = c
}
// SetDynamicClient sets the dynamic client.
func (r *ReferenceManager) SetDynamicClient(c dynamic.Interface) {
r.dynamicClient = c
}
// ValidateInitialization checks whether the plugin was correctly initialized.
func (r *ReferenceManager) ValidateInitialization() error {
if r.authorizer == nil {
return errors.New("missing authorizer")
}
if r.secretLister == nil {
return errors.New("missing secret lister")
}
if r.configMapLister == nil {
return errors.New("missing configMap lister")
}
if r.backupBucketLister == nil {
return errors.New("missing BackupBucket lister")
}
if r.cloudProfileLister == nil {
return errors.New("missing cloud profile lister")
}
if r.seedLister == nil {
return errors.New("missing seed lister")
}
if r.shootLister == nil {
return errors.New("missing shoot lister")
}
if r.secretBindingLister == nil {
return errors.New("missing secret binding lister")
}
if r.quotaLister == nil {
return errors.New("missing quota lister")
}
if r.projectLister == nil {
return errors.New("missing project lister")
}
if r.exposureClassLister == nil {
return errors.New("missing exposure class lister")
}
if r.gardenCoreClient == nil {
return errors.New("missing gardener core client")
}
return nil
}
// Admit ensures that referenced resources do actually exist.
func (r *ReferenceManager) Admit(ctx context.Context, a admission.Attributes, _ admission.ObjectInterfaces) error {
// Wait until the caches have been synced
if r.readyFunc == nil {
r.AssignReadyFunc(func() bool {
for _, readyFunc := range readyFuncs {
if !readyFunc() {
return false
}
}
return true
})
}
if !r.WaitForReady() {
return admission.NewForbidden(a, errors.New("not yet ready to handle request"))
}
var (
err error
operation = a.GetOperation()
)
if operation == admission.Delete && a.GetKind().GroupKind() != core.Kind("BackupBucket") {
return nil
}
switch a.GetKind().GroupKind() {
case core.Kind("SecretBinding"):
binding, ok := a.GetObject().(*core.SecretBinding)
if !ok {
return apierrors.NewBadRequest("could not convert resource into SecretBinding object")
}
if utils.SkipVerification(operation, binding.ObjectMeta) {
return nil
}
err = r.ensureSecretBindingReferences(ctx, a, binding)
case core.Kind("Shoot"):
var (
oldShoot, shoot *core.Shoot
ok bool
)
shoot, ok = a.GetObject().(*core.Shoot)
if !ok {
return apierrors.NewBadRequest("could not convert resource into Shoot object")
}
if utils.SkipVerification(operation, shoot.ObjectMeta) {
return nil
}
switch a.GetOperation() {
case admission.Create:
// Add createdBy annotation to Shoot
annotations := shoot.Annotations
if annotations == nil {
annotations = map[string]string{}
}
annotations[v1beta1constants.GardenCreatedBy] = a.GetUserInfo().GetName()
shoot.Annotations = annotations
oldShoot = &core.Shoot{}
case admission.Update:
// skip verification if spec wasn't changed
// this way we make sure, that users can always annotate/label the shoot if the spec doesn't change
oldShoot, ok = a.GetOldObject().(*core.Shoot)
if !ok {
return apierrors.NewBadRequest("could not convert old resource into Shoot object")
}
if reflect.DeepEqual(oldShoot.Spec, shoot.Spec) {
return nil
}
}
err = r.ensureShootReferences(ctx, a, oldShoot, shoot)
case core.Kind("Project"):
project, ok := a.GetObject().(*core.Project)
if !ok {
return apierrors.NewBadRequest("could not convert resource into Project object")
}
if utils.SkipVerification(operation, project.ObjectMeta) {
return nil
}
// Set createdBy field in Project
switch a.GetOperation() {
case admission.Create:
project.Spec.CreatedBy = &rbacv1.Subject{
APIGroup: "rbac.authorization.k8s.io",
Kind: rbacv1.UserKind,
Name: a.GetUserInfo().GetName(),
}
if project.Spec.Owner == nil {
owner := project.Spec.CreatedBy
outer:
for _, member := range project.Spec.Members {
for _, role := range member.Roles {
if role == core.ProjectMemberOwner {
owner = member.Subject.DeepCopy()
break outer
}
}
}
project.Spec.Owner = owner
}
err = r.ensureProjectNamespace(project)
case admission.Update:
oldProject, ok := a.GetOldObject().(*core.Project)
if !ok {
return apierrors.NewBadRequest("could not convert old resource into Project object")
}
if oldProject.Spec.Namespace == nil && project.Spec.Namespace != nil {
err = r.ensureProjectNamespace(project)
}
}
if project.Spec.Owner != nil {
ownerIsMember := false
for _, member := range project.Spec.Members {
if member.Subject == *project.Spec.Owner {
ownerIsMember = true
}
}
if !ownerIsMember {
project.Spec.Members = append(project.Spec.Members, core.ProjectMember{
Subject: *project.Spec.Owner,
Roles: []string{
core.ProjectMemberAdmin,
core.ProjectMemberOwner,
},
})
}
}
case core.Kind("BackupBucket"):
if operation == admission.Delete {
// The "delete endpoint" handler of the k8s.io/apiserver library calls the admission controllers
// handling DELETECOLLECTION requests with empty resource names:
// https://github.com/kubernetes/apiserver/blob/release-1.25/pkg/endpoints/handlers/delete.go#L271
// Consequently, a.GetName() equals "". This is for the admission controllers to know that all
// resources of this kind shall be deleted.
// And for all DELETE requests, a.GetObject() will be nil:
// https://github.com/kubernetes/apiserver/blob/release-1.25/pkg/endpoints/handlers/delete.go#L126
if a.GetName() == "" {
return r.validateBackupBucketDeleteCollection(ctx, a)
} else {
return r.validateBackupBucketDeletion(ctx, a)
}
} else {
backupBucket, ok := a.GetObject().(*core.BackupBucket)
if !ok {
return apierrors.NewBadRequest("could not convert resource into BackupBucket object")
}
oldBackupBucket := &core.BackupBucket{}
if operation == admission.Update {
oldBackupBucket, ok = a.GetOldObject().(*core.BackupBucket)
if !ok {
return apierrors.NewBadRequest("could not convert old resource into BackupBucket object")
}
}
err = r.ensureBackupBucketReferences(ctx, oldBackupBucket, backupBucket)
}
case core.Kind("BackupEntry"):
backupEntry, ok := a.GetObject().(*core.BackupEntry)
if !ok {
return apierrors.NewBadRequest("could not convert resource into BackupEntry object")
}
oldBackupEntry := &core.BackupEntry{}
if operation == admission.Update {
oldBackupEntry, ok = a.GetOldObject().(*core.BackupEntry)
if !ok {
return apierrors.NewBadRequest("could not convert old resource into BackupEntry object")
}
}
err = r.ensureBackupEntryReferences(oldBackupEntry, backupEntry)
case core.Kind("CloudProfile"):
cloudProfile, ok := a.GetObject().(*core.CloudProfile)
if !ok {
return apierrors.NewBadRequest("could not convert resource into CloudProfile object")
}
if utils.SkipVerification(operation, cloudProfile.ObjectMeta) {
return nil
}
if a.GetOperation() == admission.Update {
oldCloudProfile, ok := a.GetOldObject().(*core.CloudProfile)
if !ok {
return apierrors.NewBadRequest("could not convert old resource into CloudProfile object")
}
// getting Kubernetes versions that have been removed from the CloudProfile
removedKubernetesVersions := sets.StringKeySet(helper.GetRemovedVersions(oldCloudProfile.Spec.Kubernetes.Versions, cloudProfile.Spec.Kubernetes.Versions))
// getting Machine image versions that have been removed from the CloudProfile
removedMachineImageVersions := map[string]sets.Set[string]{}
for _, oldImage := range oldCloudProfile.Spec.MachineImages {
imageFound := false
for _, newImage := range cloudProfile.Spec.MachineImages {
if oldImage.Name == newImage.Name {
imageFound = true
removedMachineImageVersions[oldImage.Name] = sets.KeySet(
helper.GetRemovedVersions(
helper.ToExpirableVersions(oldImage.Versions),
helper.ToExpirableVersions(newImage.Versions),
),
)
}
}
if !imageFound {
for _, version := range oldImage.Versions {
if removedMachineImageVersions[oldImage.Name] == nil {
removedMachineImageVersions[oldImage.Name] = sets.New[string]()
}
removedMachineImageVersions[oldImage.Name] = removedMachineImageVersions[oldImage.Name].Insert(version.Version)
}
}
}
if len(removedKubernetesVersions) > 0 || len(removedMachineImageVersions) > 0 {
shootList, err1 := r.shootLister.List(labels.Everything())
if err1 != nil {
return apierrors.NewInternalError(fmt.Errorf("could not list shoots to verify that Kubernetes and/or Machine image version can be removed: %v", err1))
}
var (
channel = make(chan error)
wg sync.WaitGroup
)
wg.Add(len(shootList))
for _, s := range shootList {
if s.Spec.CloudProfileName != cloudProfile.Name || s.DeletionTimestamp != nil {
wg.Done()
continue
}
go func(shoot *gardencorev1beta1.Shoot) {
defer wg.Done()
if removedKubernetesVersions.Has(shoot.Spec.Kubernetes.Version) {
channel <- fmt.Errorf("unable to delete Kubernetes version %q from CloudProfile %q - version is still in use by shoot '%s/%s'", shoot.Spec.Kubernetes.Version, shoot.Spec.CloudProfileName, shoot.Namespace, shoot.Name)
}
for _, worker := range shoot.Spec.Provider.Workers {
if worker.Machine.Image == nil {
continue
}
// happens if Shoot runs an image that does not exist in the old CloudProfile - in this case: ignore
if _, ok := removedMachineImageVersions[worker.Machine.Image.Name]; !ok {
continue
}
if removedMachineImageVersions[worker.Machine.Image.Name].Has(*worker.Machine.Image.Version) {
channel <- fmt.Errorf("unable to delete Machine image version '%s/%s' from CloudProfile %q - version is still in use by shoot '%s/%s' by worker %q", worker.Machine.Image.Name, *worker.Machine.Image.Version, shoot.Spec.CloudProfileName, shoot.Namespace, shoot.Name, worker.Name)
}
}
}(s)
}
// close channel when wait group has 0 counter
go func() {
wg.Wait()
close(channel)
}()
for channelResult := range channel {
err = multierror.Append(err, channelResult)
}
}
}
case core.Kind("ControllerRegistration"):
controllerRegistration, ok := a.GetObject().(*core.ControllerRegistration)
if !ok {
return apierrors.NewBadRequest("could not convert resource into ControllerRegistration object")
}
err = r.ensureControllerRegistrationReferences(ctx, controllerRegistration)
}
if err != nil {
return admission.NewForbidden(a, err)
}
return nil
}
func (r *ReferenceManager) ensureControllerRegistrationReferences(ctx context.Context, ctrlReg *core.ControllerRegistration) error {
deployment := ctrlReg.Spec.Deployment
if ctrlReg.Spec.Deployment == nil {
return nil
}
var refErrs error
for _, reg := range deployment.DeploymentRefs {
if err := r.lookupControllerDeployment(ctx, reg.Name); err != nil {
refErrs = multierror.Append(refErrs, err)
}
}
return refErrs
}
func (r *ReferenceManager) ensureProjectNamespace(project *core.Project) error {
projects, err := r.projectLister.List(labels.Everything())
if err != nil {
return err
}
for _, p := range projects {
if p.Spec.Namespace != nil && project.Spec.Namespace != nil && *p.Spec.Namespace == *project.Spec.Namespace && p.Name != project.Name {
return fmt.Errorf("namespace %q is already used by another project", *project.Spec.Namespace)
}
}
return nil
}
func (r *ReferenceManager) ensureSecretBindingReferences(ctx context.Context, attributes admission.Attributes, binding *core.SecretBinding) error {
readAttributes := authorizer.AttributesRecord{
User: attributes.GetUserInfo(),
Verb: "get",
APIGroup: "",
APIVersion: "v1",
Resource: "secrets",
Namespace: binding.SecretRef.Namespace,
Name: binding.SecretRef.Name,
ResourceRequest: true,
}
if decision, _, _ := r.authorizer.Authorize(ctx, readAttributes); decision != authorizer.DecisionAllow {
return errors.New("SecretBinding cannot reference a secret you are not allowed to read")
}
if err := r.lookupSecret(ctx, binding.SecretRef.Namespace, binding.SecretRef.Name); err != nil {
return err
}
var (
secretQuotaCount int
projectQuotaCount int
)
for _, quotaRef := range binding.Quotas {
readAttributes := authorizer.AttributesRecord{
User: attributes.GetUserInfo(),
Verb: "get",
APIGroup: gardencorev1beta1.SchemeGroupVersion.Group,
APIVersion: gardencorev1beta1.SchemeGroupVersion.Version,
Resource: "quotas",
Subresource: "",
Namespace: quotaRef.Namespace,
Name: quotaRef.Name,
ResourceRequest: true,
Path: "",
}
if decision, _, _ := r.authorizer.Authorize(ctx, readAttributes); decision != authorizer.DecisionAllow {
return errors.New("SecretBinding cannot reference a quota you are not allowed to read")
}
quota, err := r.quotaLister.Quotas(quotaRef.Namespace).Get(quotaRef.Name)
if err != nil {
return err
}
scope, err := helper.QuotaScope(quota.Spec.Scope)
if err != nil {
return err
}
if scope == "project" {
projectQuotaCount++
}
if scope == "secret" {
secretQuotaCount++
}
if projectQuotaCount > 1 || secretQuotaCount > 1 {
return errors.New("only one quota per scope (project or secret) can be assigned")
}
}
return nil
}
func (r *ReferenceManager) ensureShootReferences(ctx context.Context, attributes admission.Attributes, oldShoot, shoot *core.Shoot) error {
if !equality.Semantic.DeepEqual(oldShoot.Spec.CloudProfileName, shoot.Spec.CloudProfileName) {
if _, err := r.cloudProfileLister.Get(shoot.Spec.CloudProfileName); err != nil {
return err
}
}
if !equality.Semantic.DeepEqual(oldShoot.Spec.SeedName, shoot.Spec.SeedName) {
if shoot.Spec.SeedName != nil {
if _, err := r.seedLister.Get(*shoot.Spec.SeedName); err != nil {
return err
}
}
}
if shoot.Spec.SecretBindingName != nil && !equality.Semantic.DeepEqual(oldShoot.Spec.SecretBindingName, shoot.Spec.SecretBindingName) {
if _, err := r.secretBindingLister.SecretBindings(shoot.Namespace).Get(*shoot.Spec.SecretBindingName); err != nil {
return err
}
}
if !equality.Semantic.DeepEqual(oldShoot.Spec.ExposureClassName, shoot.Spec.ExposureClassName) && shoot.Spec.ExposureClassName != nil {
if _, err := r.exposureClassLister.Get(*shoot.Spec.ExposureClassName); err != nil {
return err
}
}
if !equality.Semantic.DeepEqual(oldShoot.Spec.Resources, shoot.Spec.Resources) {
for _, resource := range shoot.Spec.Resources {
// Get the APIResource for the current resource
apiResource, err := r.getAPIResource(resource.ResourceRef.APIVersion, resource.ResourceRef.Kind)
if err != nil {
return err
}
if apiResource == nil {
return fmt.Errorf("shoot resource reference %q could not be resolved for API resource with version %q and kind %q", resource.Name, resource.ResourceRef.APIVersion, resource.ResourceRef.Kind)
}
// Parse APIVersion to GroupVersion
gv, err := schema.ParseGroupVersion(resource.ResourceRef.APIVersion)
if err != nil {
return err
}
// Check if the resource is namespaced
if !apiResource.Namespaced {
return fmt.Errorf("failed to resolve shoot resource reference %q. Cannot reference a resource that is not namespaced", resource.Name)
}
// Check if the user is allowed to read the resource
readAttributes := authorizer.AttributesRecord{
User: attributes.GetUserInfo(),
Verb: "get",
APIGroup: gv.Group,
APIVersion: gv.Version,
Resource: apiResource.Name,
Namespace: shoot.Namespace,
Name: resource.ResourceRef.Name,
ResourceRequest: true,
}
if decision, _, _ := r.authorizer.Authorize(ctx, readAttributes); decision != authorizer.DecisionAllow {
return errors.New("shoot cannot reference a resource you are not allowed to read")
}
// Check if the resource actually exists
if err := r.lookupResource(ctx, gv.WithResource(apiResource.Name), shoot.Namespace, resource.ResourceRef.Name); err != nil {
return fmt.Errorf("failed to resolve shoot resource reference %q: %w", resource.Name, err)
}
}
}
if !equality.Semantic.DeepEqual(oldShoot.Spec.DNS, shoot.Spec.DNS) && shoot.Spec.DNS != nil && shoot.DeletionTimestamp == nil {
for _, dnsProvider := range shoot.Spec.DNS.Providers {
if dnsProvider.SecretName == nil {
continue
}
if err := r.lookupSecret(ctx, shoot.Namespace, *dnsProvider.SecretName); err != nil {
return fmt.Errorf("failed to reference DNS provider secret %w", err)
}
}
}
return nil
}
func (r *ReferenceManager) ensureBackupEntryReferences(oldBackupEntry, backupEntry *core.BackupEntry) error {
if !equality.Semantic.DeepEqual(oldBackupEntry.Spec.SeedName, backupEntry.Spec.SeedName) {
if backupEntry.Spec.SeedName != nil {
if _, err := r.seedLister.Get(*backupEntry.Spec.SeedName); err != nil {
return err
}
}
}
if !equality.Semantic.DeepEqual(oldBackupEntry.Spec.BucketName, backupEntry.Spec.BucketName) {
if _, err := r.backupBucketLister.Get(backupEntry.Spec.BucketName); err != nil {
return err
}
}
return nil
}
func (r *ReferenceManager) ensureBackupBucketReferences(ctx context.Context, oldBackupBucket, backupBucket *core.BackupBucket) error {
if !equality.Semantic.DeepEqual(oldBackupBucket.Spec.SeedName, backupBucket.Spec.SeedName) {
if backupBucket.Spec.SeedName != nil {
if _, err := r.seedLister.Get(*backupBucket.Spec.SeedName); err != nil {
return err
}
}
}
return r.lookupSecret(ctx, backupBucket.Spec.SecretRef.Namespace, backupBucket.Spec.SecretRef.Name)
}
func (r *ReferenceManager) validateBackupBucketDeleteCollection(ctx context.Context, a admission.Attributes) error {
backupBucketList, err := r.gardenCoreClient.CoreV1beta1().BackupBuckets().List(ctx, metav1.ListOptions{LabelSelector: labels.Everything().String()})
if err != nil {
return err
}
for _, backupBucket := range backupBucketList.Items {
if err := r.validateBackupBucketDeletion(ctx, utils.NewAttributesWithName(a, backupBucket.Name)); err != nil {
return err
}
}
return nil
}
func (r *ReferenceManager) validateBackupBucketDeletion(ctx context.Context, a admission.Attributes) error {
backupEntryList, err := r.gardenCoreClient.CoreV1beta1().BackupEntries("").List(ctx, metav1.ListOptions{
FieldSelector: fields.SelectorFromSet(fields.Set{core.BackupEntryBucketName: a.GetName()}).String(),
})
if err != nil {
return err
}
associatedBackupEntries := make([]string, 0, len(backupEntryList.Items))
for _, entry := range backupEntryList.Items {
associatedBackupEntries = append(associatedBackupEntries, client.ObjectKeyFromObject(&entry).String())
}
if len(associatedBackupEntries) > 0 {
return admission.NewForbidden(a, fmt.Errorf("cannot delete BackupBucket because BackupEntries are still referencing it, backupEntryNames: %s", strings.Join(associatedBackupEntries, ",")))
}
return nil
}
type getFn func(context.Context, string, string) (runtime.Object, error)
func lookupResource(ctx context.Context, namespace, name string, get getFn, fallbackGet getFn) error {
// First try to detect the secret in the cache.
var err error
_, err = get(ctx, namespace, name)
if err == nil {
return nil
}
if !apierrors.IsNotFound(err) {
return err
}
// Second try to detect the secret in the cache after the first try failed.
// Give the cache time to observe the secret before rejecting a create.
// This helps when creating a secret and immediately creating a secretbinding referencing it.
time.Sleep(MissingSecretWait)
_, err = get(ctx, namespace, name)
switch {
case apierrors.IsNotFound(err):
// no-op
case err != nil:
return err
default:
return nil
}
// Third try to detect the secret, now by doing a live lookup instead of relying on the cache.
if _, err := fallbackGet(ctx, namespace, name); err != nil {
return err
}
return nil
}
func (r *ReferenceManager) lookupSecret(ctx context.Context, namespace, name string) error {
secretFromLister := func(_ context.Context, namespace, name string) (runtime.Object, error) {
return r.secretLister.Secrets(namespace).Get(name)
}
secretFromClient := func(ctx context.Context, namespace, name string) (runtime.Object, error) {
return r.kubeClient.CoreV1().Secrets(namespace).Get(ctx, name, kubernetesclient.DefaultGetOptions())
}
return lookupResource(ctx, namespace, name, secretFromLister, secretFromClient)
}
func (r *ReferenceManager) lookupControllerDeployment(ctx context.Context, name string) error {
deploymentFromLister := func(_ context.Context, _, name string) (runtime.Object, error) {
return r.controllerDeploymentLister.Get(name)
}
deploymentFromClient := func(ctx context.Context, _, name string) (runtime.Object, error) {
return r.gardenCoreClient.CoreV1beta1().ControllerDeployments().Get(ctx, name, kubernetesclient.DefaultGetOptions())
}
return lookupResource(ctx, "", name, deploymentFromLister, deploymentFromClient)
}
func (r *ReferenceManager) getAPIResource(groupVersion, kind string) (*metav1.APIResource, error) {
resources, err := r.kubeClient.Discovery().ServerResourcesForGroupVersion(groupVersion)
if err != nil {
return nil, err
}
for _, apiResource := range resources.APIResources {
if apiResource.Kind == kind {
return &apiResource, nil
}
}
return nil, nil
}
func (r *ReferenceManager) lookupResource(ctx context.Context, resource schema.GroupVersionResource, namespace, name string) error {
if _, err := r.dynamicClient.Resource(resource).Namespace(namespace).Get(ctx, name, kubernetesclient.DefaultGetOptions()); err != nil {
return err
}
return nil
}