mirror of
https://gitea.com/Lydanne/buildx.git
synced 2025-11-04 18:13:42 +08:00
102 lines
4.0 KiB
Go
102 lines
4.0 KiB
Go
/*
|
|
Copyright 2021 The Kubernetes Authors.
|
|
|
|
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 managedfields
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
|
|
"sigs.k8s.io/structured-merge-diff/v4/fieldpath"
|
|
"sigs.k8s.io/structured-merge-diff/v4/typed"
|
|
|
|
"k8s.io/apimachinery/pkg/api/meta"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
|
|
"k8s.io/apimachinery/pkg/runtime"
|
|
)
|
|
|
|
// ExtractInto extracts the applied configuration state from object for fieldManager
|
|
// into applyConfiguration. If no managed fields are found for the given fieldManager,
|
|
// no error is returned, but applyConfiguration is left unpopulated. It is possible
|
|
// that no managed fields were found for the fieldManager because other field managers
|
|
// have taken ownership of all the fields previously owned by the fieldManager. It is
|
|
// also possible the fieldManager never owned fields.
|
|
//
|
|
// The provided object MUST bo a root resource object since subresource objects
|
|
// do not contain their own managed fields. For example, an autoscaling.Scale
|
|
// object read from a "scale" subresource does not have any managed fields and so
|
|
// cannot be used as the object.
|
|
//
|
|
// If the fields of a subresource are a subset of the fields of the root object,
|
|
// and their field paths and types are exactly the same, then ExtractInto can be
|
|
// called with the root resource as the object and the subresource as the
|
|
// applyConfiguration. This works for "status", obviously, because status is
|
|
// represented by the exact same object as the root resource. This this does NOT
|
|
// work, for example, with the "scale" subresources of Deployment, ReplicaSet and
|
|
// StatefulSet. While the spec.replicas, status.replicas fields are in the same
|
|
// exact field path locations as they are in autoscaling.Scale, the selector
|
|
// fields are in different locations, and are a different type.
|
|
func ExtractInto(object runtime.Object, objectType typed.ParseableType, fieldManager string, applyConfiguration interface{}, subresource string) error {
|
|
typedObj, err := toTyped(object, objectType)
|
|
if err != nil {
|
|
return fmt.Errorf("error converting obj to typed: %w", err)
|
|
}
|
|
|
|
accessor, err := meta.Accessor(object)
|
|
if err != nil {
|
|
return fmt.Errorf("error accessing metadata: %w", err)
|
|
}
|
|
fieldsEntry, ok := findManagedFields(accessor, fieldManager, subresource)
|
|
if !ok {
|
|
return nil
|
|
}
|
|
fieldset := &fieldpath.Set{}
|
|
err = fieldset.FromJSON(bytes.NewReader(fieldsEntry.FieldsV1.Raw))
|
|
if err != nil {
|
|
return fmt.Errorf("error marshalling FieldsV1 to JSON: %w", err)
|
|
}
|
|
|
|
u := typedObj.ExtractItems(fieldset.Leaves()).AsValue().Unstructured()
|
|
m, ok := u.(map[string]interface{})
|
|
if !ok {
|
|
return fmt.Errorf("unable to convert managed fields for %s to unstructured, expected map, got %T", fieldManager, u)
|
|
}
|
|
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(m, applyConfiguration); err != nil {
|
|
return fmt.Errorf("error extracting into obj from unstructured: %w", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func findManagedFields(accessor metav1.Object, fieldManager string, subresource string) (metav1.ManagedFieldsEntry, bool) {
|
|
objManagedFields := accessor.GetManagedFields()
|
|
for _, mf := range objManagedFields {
|
|
if mf.Manager == fieldManager && mf.Operation == metav1.ManagedFieldsOperationApply && mf.Subresource == subresource {
|
|
return mf, true
|
|
}
|
|
}
|
|
return metav1.ManagedFieldsEntry{}, false
|
|
}
|
|
|
|
func toTyped(obj runtime.Object, objectType typed.ParseableType) (*typed.TypedValue, error) {
|
|
switch o := obj.(type) {
|
|
case *unstructured.Unstructured:
|
|
return objectType.FromUnstructured(o.Object)
|
|
default:
|
|
return objectType.FromStructured(o)
|
|
}
|
|
}
|