/
identity.go
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/
identity.go
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// Copyright 2022 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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.
package bootstrappers
import (
"context"
"fmt"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/utils/ptr"
"sigs.k8s.io/controller-runtime/pkg/client"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/resourcemanager/apis/config"
)
// IdentityDeterminer determines the identity of the source cluster.
type IdentityDeterminer struct {
Logger logr.Logger
SourceClient client.Client
Config *config.ResourceManagerConfiguration
}
// Start determines the identity.
func (i *IdentityDeterminer) Start(ctx context.Context) error {
if clusterID := ptr.Deref(i.Config.Controllers.ClusterID, ""); clusterID == "<cluster>" || clusterID == "<default>" {
i.Logger.Info("Trying to get cluster id from cluster")
id, err := i.determineClusterIdentity(ctx, clusterID == "<cluster>")
if err != nil {
return fmt.Errorf("unable to determine cluster id: %+v", err)
}
i.Config.Controllers.ClusterID = &id
}
i.Logger.Info("Using cluster id", "clusterID", *i.Config.Controllers.ClusterID)
return nil
}
// determineClusterIdentity is used to extract the cluster identity from the cluster-identity
// config map. This is intended as fallback if no explicit cluster identity is given.
// in seed-shoot scenario, the cluster id for the managed resources must be explicitly given
// to support the migration of a shoot from one seed to another. Here the identity `seed` should
// be set.
func (i *IdentityDeterminer) determineClusterIdentity(ctx context.Context, force bool) (string, error) {
configMap := &corev1.ConfigMap{}
if err := i.SourceClient.Get(ctx, client.ObjectKey{Name: v1beta1constants.ClusterIdentity, Namespace: metav1.NamespaceSystem}, configMap); err == nil {
if id, ok := configMap.Data[v1beta1constants.ClusterIdentity]; ok {
return id, nil
}
if force {
return "", fmt.Errorf("cannot determine cluster identity from configmap: no cluster-identity entry")
}
} else {
if force || !apierrors.IsNotFound(err) {
return "", fmt.Errorf("cannot determine cluster identity from configmap: %s", err)
}
}
return "", nil
}