139 lines
4.6 KiB
Go
139 lines
4.6 KiB
Go
/*
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Copyright the Velero contributors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package restore
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import (
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"encoding/json"
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jsonpatch "github.com/evanphx/json-patch/v5"
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"github.com/pkg/errors"
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corev1api "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/equality"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/runtime"
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)
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// mergeServiceAccount takes a backed up serviceaccount and merges attributes into the current in-cluster service account.
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// Labels and Annotations on the backed up version but not on the in-cluster version will be merged. If a key is specified in both, the in-cluster version is retained.
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func mergeServiceAccounts(fromCluster, fromBackup *unstructured.Unstructured) (*unstructured.Unstructured, error) {
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desired := new(corev1api.ServiceAccount)
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if err := runtime.DefaultUnstructuredConverter.FromUnstructured(fromCluster.UnstructuredContent(), desired); err != nil {
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return nil, errors.Wrap(err, "unable to convert from-cluster service account from unstructured to serviceaccount")
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}
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backupSA := new(corev1api.ServiceAccount)
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if err := runtime.DefaultUnstructuredConverter.FromUnstructured(fromBackup.UnstructuredContent(), backupSA); err != nil {
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return nil, errors.Wrap(err, "unable to convert from backed up service account unstructured to serviceaccount")
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}
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desired.Secrets = mergeObjectReferenceSlices(desired.Secrets, backupSA.Secrets)
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desired.ImagePullSecrets = mergeLocalObjectReferenceSlices(desired.ImagePullSecrets, backupSA.ImagePullSecrets)
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desired.Labels = mergeMaps(desired.Labels, backupSA.Labels)
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desired.Annotations = mergeMaps(desired.Annotations, backupSA.Annotations)
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desiredUnstructured, err := runtime.DefaultUnstructuredConverter.ToUnstructured(desired)
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if err != nil {
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return nil, errors.Wrap(err, "unable to convert desired service account to unstructured")
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}
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// The DefaultUnstructuredConverter.ToUnstructured function will populate the creation timestamp with the nil value
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// However, we remove this on both the backup and cluster objects before comparison, and we don't want it in any patches.
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delete(desiredUnstructured["metadata"].(map[string]interface{}), "creationTimestamp")
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return &unstructured.Unstructured{Object: desiredUnstructured}, nil
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}
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func mergeObjectReferenceSlices(first, second []corev1api.ObjectReference) []corev1api.ObjectReference {
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for _, s := range second {
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var exists bool
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for _, f := range first {
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if s.Name == f.Name {
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exists = true
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break
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}
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}
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if !exists {
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first = append(first, s)
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}
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}
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return first
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}
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func mergeLocalObjectReferenceSlices(first, second []corev1api.LocalObjectReference) []corev1api.LocalObjectReference {
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for _, s := range second {
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var exists bool
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for _, f := range first {
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if s.Name == f.Name {
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exists = true
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break
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}
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}
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if !exists {
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first = append(first, s)
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}
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}
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return first
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}
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// mergeMaps takes two map[string]string and merges missing keys from the second into the first.
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// If a key already exists, its value is not overwritten.
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func mergeMaps(first, second map[string]string) map[string]string {
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// If the first map passed in is empty, just use all of the second map's data
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if first == nil {
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first = map[string]string{}
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}
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for k, v := range second {
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_, ok := first[k]
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if !ok {
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first[k] = v
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}
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}
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return first
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}
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// generatePatch will calculate a JSON merge patch for an object's desired state.
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// If the passed in objects are already equal, nil is returned.
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func generatePatch(fromCluster, desired *unstructured.Unstructured) ([]byte, error) {
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// If the objects are already equal, there's no need to generate a patch.
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if equality.Semantic.DeepEqual(fromCluster, desired) {
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return nil, nil
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}
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desiredBytes, err := json.Marshal(desired.Object)
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if err != nil {
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return nil, errors.Wrap(err, "unable to marshal desired object")
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}
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fromClusterBytes, err := json.Marshal(fromCluster.Object)
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if err != nil {
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return nil, errors.Wrap(err, "unable to marshal in-cluster object")
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}
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patchBytes, err := jsonpatch.CreateMergePatch(fromClusterBytes, desiredBytes)
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if err != nil {
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return nil, errors.Wrap(err, "unable to create merge patch")
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}
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return patchBytes, nil
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}
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