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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 crane
import "github.com/google/go-containerregistry/pkg/logs"
// Digest returns the sha256 hash of the remote image at ref.
func Digest(ref string, opt ...Option) (string, error) {
o := makeOptions(opt...)
if o.Platform != nil {
desc, err := getManifest(ref, opt...)
if err != nil {
return "", err
}
if !desc.MediaType.IsIndex() {
return desc.Digest.String(), nil
}
// TODO: does not work for indexes which contain schema v1 manifests
img, err := desc.Image()
if err != nil {
return "", err
}
digest, err := img.Digest()
if err != nil {
return "", err
}
return digest.String(), nil
}
desc, err := Head(ref, opt...)
if err != nil {
logs.Warn.Printf("HEAD request failed, falling back on GET: %v", err)
rdesc, err := getManifest(ref, opt...)
if err != nil {
return "", err
}
return rdesc.Digest.String(), nil
}
return desc.Digest.String(), nil
}
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