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// Copyright 2018 Google LLC All Rights Reserved.
//
// 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 empty
import (
"encoding/json"
"errors"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/partial"
"github.com/google/go-containerregistry/pkg/v1/types"
)
// Index is a singleton empty index, think: FROM scratch.
var Index = emptyIndex{}
type emptyIndex struct{}
func (i emptyIndex) MediaType() (types.MediaType, error) {
return types.OCIImageIndex, nil
}
func (i emptyIndex) Digest() (v1.Hash, error) {
return partial.Digest(i)
}
func (i emptyIndex) Size() (int64, error) {
return partial.Size(i)
}
func (i emptyIndex) IndexManifest() (*v1.IndexManifest, error) {
return base(), nil
}
func (i emptyIndex) RawManifest() ([]byte, error) {
return json.Marshal(base())
}
func (i emptyIndex) Image(v1.Hash) (v1.Image, error) {
return nil, errors.New("empty index")
}
func (i emptyIndex) ImageIndex(v1.Hash) (v1.ImageIndex, error) {
return nil, errors.New("empty index")
}
func base() *v1.IndexManifest {
return &v1.IndexManifest{
SchemaVersion: 2,
MediaType: types.OCIImageIndex,
Manifests: []v1.Descriptor{},
}
}
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