func (*tarballImageSource) GetSignatures(ctx context.Context, instanceDigest *digest.Digest) ([][]byte, error) {
	if instanceDigest != nil {
		return nil, fmt.Errorf("manifest lists are not supported by the %q transport", transportName)
	}
	return nil, nil
}
func (*tarballImageSource) GetSignatures(ctx context.Context, instanceDigest *digest.Digest) ([][]byte, error) {
	if instanceDigest != nil {
		return nil, fmt.Errorf("manifest lists are not supported by the %q transport", transportName)
	}
	return nil, nil
}
func ( * tarballImageSource ) GetSignatures ( ctx context . Context , instanceDigest * digest . Digest ) ( [ ] [ ] byte , error ) { if instanceDigest != nil { return nil , fmt . Errorf ( " " , transportName ) } return nil , nil }
// GetSignatures 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 not a manifest list
// (e.g. if the source never returns manifest lists).
GetSignatures 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 not a manifest list ( e . g . if the source never returns manifest lists ) .