// // 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 }