mirror of https://github.com/docker/cli.git
110 lines
3.1 KiB
Go
110 lines
3.1 KiB
Go
/*
|
|
Copyright 2014 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 reference
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
|
|
"k8s.io/api/core/v1"
|
|
"k8s.io/apimachinery/pkg/api/meta"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/runtime"
|
|
)
|
|
|
|
var (
|
|
// Errors that could be returned by GetReference.
|
|
ErrNilObject = errors.New("can't reference a nil object")
|
|
)
|
|
|
|
// GetReference returns an ObjectReference which refers to the given
|
|
// object, or an error if the object doesn't follow the conventions
|
|
// that would allow this.
|
|
// TODO: should take a meta.Interface see http://issue.k8s.io/7127
|
|
func GetReference(scheme *runtime.Scheme, obj runtime.Object) (*v1.ObjectReference, error) {
|
|
if obj == nil {
|
|
return nil, ErrNilObject
|
|
}
|
|
if ref, ok := obj.(*v1.ObjectReference); ok {
|
|
// Don't make a reference to a reference.
|
|
return ref, nil
|
|
}
|
|
|
|
// An object that implements only List has enough metadata to build a reference
|
|
var listMeta metav1.Common
|
|
objectMeta, err := meta.Accessor(obj)
|
|
if err != nil {
|
|
listMeta, err = meta.CommonAccessor(obj)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
} else {
|
|
listMeta = objectMeta
|
|
}
|
|
|
|
gvk := obj.GetObjectKind().GroupVersionKind()
|
|
|
|
// If object meta doesn't contain data about kind and/or version,
|
|
// we are falling back to scheme.
|
|
//
|
|
// TODO: This doesn't work for CRDs, which are not registered in scheme.
|
|
if gvk.Empty() {
|
|
gvks, _, err := scheme.ObjectKinds(obj)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(gvks) == 0 || gvks[0].Empty() {
|
|
return nil, fmt.Errorf("unexpected gvks registered for object %T: %v", obj, gvks)
|
|
}
|
|
// TODO: The same object can be registered for multiple group versions
|
|
// (although in practise this doesn't seem to be used).
|
|
// In such case, the version set may not be correct.
|
|
gvk = gvks[0]
|
|
}
|
|
|
|
kind := gvk.Kind
|
|
version := gvk.GroupVersion().String()
|
|
|
|
// only has list metadata
|
|
if objectMeta == nil {
|
|
return &v1.ObjectReference{
|
|
Kind: kind,
|
|
APIVersion: version,
|
|
ResourceVersion: listMeta.GetResourceVersion(),
|
|
}, nil
|
|
}
|
|
|
|
return &v1.ObjectReference{
|
|
Kind: kind,
|
|
APIVersion: version,
|
|
Name: objectMeta.GetName(),
|
|
Namespace: objectMeta.GetNamespace(),
|
|
UID: objectMeta.GetUID(),
|
|
ResourceVersion: objectMeta.GetResourceVersion(),
|
|
}, nil
|
|
}
|
|
|
|
// GetPartialReference is exactly like GetReference, but allows you to set the FieldPath.
|
|
func GetPartialReference(scheme *runtime.Scheme, obj runtime.Object, fieldPath string) (*v1.ObjectReference, error) {
|
|
ref, err := GetReference(scheme, obj)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
ref.FieldPath = fieldPath
|
|
return ref, nil
|
|
}
|