Method GetSignaturesWithFormat

openshift/openshift_src.go:104–128

GetSignaturesWithFormat returns the image's signatures. It may use a remote (= slow) service. If instanceDigest is not nil, it contains a digest of the specific manifest instance to retrieve signatures for (when the primary manifest is a manifest list); this never happens if the primary manifest is

(ctx context.Context, instanceDigest *digest.Digest)

// (when the primary manifest is a manifest list); this never happens if the primary manifest is not a manifest list
// (e.g. if the source never returns manifest lists).
func (s *openshiftImageSource) GetSignaturesWithFormat(ctx context.Context, instanceDigest *digest.Digest) ([]signature.Signature, error) {
	var imageStreamImageName string
	if instanceDigest == nil {
		if err := s.ensureImageIsResolved(ctx); err != nil {
			return nil, err
		}
		imageStreamImageName = s.imageStreamImageName
	} else {
		if err := instanceDigest.Validate(); err != nil { // Make sure instanceDigest.String() does not contain any unexpected characters
			return nil, err
		}
		imageStreamImageName = instanceDigest.String()
	}
	image, err := s.client.getImage(ctx, imageStreamImageName)
	if err != nil {
		return nil, err
	}
	var sigs []signature.Signature
	for _, sig := range image.Signatures {
		if sig.Type == imageSignatureTypeAtomic {
			sigs = append(sigs, signature.SimpleSigningFromBlob(sig.Content))
		}
	}
	return sigs, nil
}

// ensureImageIsResolved sets up s.docker and s.imageStreamImageName
func (s *openshiftImageSource) ensureImageIsResolved(ctx context.Context) error {