}
    }

    private List<PGPPublicKeyRing> loadExistingKeyRing(BuildTreeDefinedKeys keyrings) throws IOException {
        File effectiveFile = mayBeDryRunFile(keyrings.getEffectiveKeyringsFile());
        if (!effectiveFile.exists()) {
            return Collections.emptyList();
        }
        List<PGPPublicKeyRing> existingRings = SecuritySupport.loadKeyRingFile(effectiveFile);