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registry.go
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registry.go
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package cosign
import (
"fmt"
"net/http"
"github.com/google/go-containerregistry/pkg/authn"
"github.com/google/go-containerregistry/pkg/crane"
"github.com/google/go-containerregistry/pkg/name"
"github.com/google/go-containerregistry/pkg/v1/remote"
"github.com/google/go-containerregistry/pkg/v1/remote/transport"
"github.com/sirupsen/logrus"
)
/* DISCLAIMER: Some parts of this code are copied from the crane package.
* Source: github.com/google/go-containerregistry/pkg/crane
* Original License below:
* ------------------------------------------------------------
* 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.
* ------------------------------------------------------------
*/
// SimpleDigest is an adaption of crane.Digest
// - it returns the sha256 hash of the remote image at ref.
// - removed: it does not support platform specific images (we don't need that here)
// - added: it returns an error if the image is not found on first try with HEAD
// (to lower the number of GET requests against potentially rate limited registries)
func SimpleDigest(ref name.Reference, opt ...crane.Option) (string, error) {
o := makeOptions(opt...)
desc, err := crane.Head(ref.Name(), opt...)
if err != nil {
if terr, ok := err.(*transport.Error); ok && terr.StatusCode == http.StatusNotFound {
return "", fmt.Errorf("ref %s not found: %w", ref, terr)
}
logrus.Debugf("HEAD request failed for ref %s, falling back on GET: %v", ref, err)
rdesc, err := remote.Get(ref, o.Remote...)
if err != nil {
return "", err
}
return rdesc.Digest.String(), nil
}
return desc.Digest.String(), nil
}
func makeOptions(opts ...crane.Option) crane.Options {
opt := crane.Options{
Remote: []remote.Option{
remote.WithAuthFromKeychain(authn.DefaultKeychain),
},
Keychain: authn.DefaultKeychain,
}
for _, o := range opts {
o(&opt)
}
return opt
}