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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 remote
import (
"github.com/google/go-containerregistry/pkg/name"
)
// ResolveDigest returns the digest of the image at the reference.
//
// If the reference is by digest already, it simply extracts the digest.
// Otherwise, it looks up the digest from the registry.
func ResolveDigest(ref name.Reference, opts ...Option) (name.Digest, error) {
o := makeOptions(ref.Context(), opts...)
if d, ok := ref.(name.Digest); ok {
return d, nil
}
desc, err := remoteGet(ref, o.ROpt...)
if err != nil {
return name.Digest{}, err
}
return ref.Context().Digest(desc.Digest.String()), nil
}
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