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64 lines
1.6 KiB
64 lines
1.6 KiB
// Copyright 2018 Google LLC All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package empty
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import (
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"encoding/json"
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"errors"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/partial"
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"github.com/google/go-containerregistry/pkg/v1/types"
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)
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// Index is a singleton empty index, think: FROM scratch.
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var Index = emptyIndex{}
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type emptyIndex struct{}
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func (i emptyIndex) MediaType() (types.MediaType, error) {
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return types.OCIImageIndex, nil
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}
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func (i emptyIndex) Digest() (v1.Hash, error) {
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return partial.Digest(i)
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}
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func (i emptyIndex) Size() (int64, error) {
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return partial.Size(i)
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}
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func (i emptyIndex) IndexManifest() (*v1.IndexManifest, error) {
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return base(), nil
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}
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func (i emptyIndex) RawManifest() ([]byte, error) {
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return json.Marshal(base())
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}
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func (i emptyIndex) Image(v1.Hash) (v1.Image, error) {
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return nil, errors.New("empty index")
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}
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func (i emptyIndex) ImageIndex(v1.Hash) (v1.ImageIndex, error) {
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return nil, errors.New("empty index")
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}
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func base() *v1.IndexManifest {
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return &v1.IndexManifest{
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SchemaVersion: 2,
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MediaType: types.OCIImageIndex,
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}
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}
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