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//
// Copyright 2021 The Sigstore 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 empty
import (
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/empty"
"github.com/google/go-containerregistry/pkg/v1/mutate"
"github.com/google/go-containerregistry/pkg/v1/types"
"github.com/sigstore/cosign/v2/pkg/oci"
)
// Signatures constructs an empty oci.Signatures.
func Signatures() oci.Signatures {
base := empty.Image
if !oci.DockerMediaTypes() {
base = mutate.MediaType(base, types.OCIManifestSchema1)
base = mutate.ConfigMediaType(base, types.OCIConfigJSON)
}
return &emptyImage{
Image: base,
}
}
type emptyImage struct {
v1.Image
}
var _ oci.Signatures = (*emptyImage)(nil)
// Get implements oci.Signatures
func (*emptyImage) Get() ([]oci.Signature, error) {
return nil, nil
}
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