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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 (
"fmt"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/partial"
"github.com/google/go-containerregistry/pkg/v1/types"
)
// Image is a singleton empty image, think: FROM scratch.
var Image, _ = partial.UncompressedToImage(emptyImage{})
type emptyImage struct{}
// MediaType implements partial.UncompressedImageCore.
func (i emptyImage) MediaType() (types.MediaType, error) {
return types.DockerManifestSchema2, nil
}
// RawConfigFile implements partial.UncompressedImageCore.
func (i emptyImage) RawConfigFile() ([]byte, error) {
return partial.RawConfigFile(i)
}
// ConfigFile implements v1.Image.
func (i emptyImage) ConfigFile() (*v1.ConfigFile, error) {
return &v1.ConfigFile{
RootFS: v1.RootFS{
// Some clients check this.
Type: "layers",
},
}, nil
}
func (i emptyImage) LayerByDiffID(h v1.Hash) (partial.UncompressedLayer, error) {
return nil, fmt.Errorf("LayerByDiffID(%s): empty image", h)
}
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