private static String maybeQuoteETag(String eTag) {
        if (!eTag.startsWith("\"") && !eTag.endsWith("\"")) {
            eTag = "\"" + eTag + "\"";
        }
        return eTag;
    }
Write the String representation of a filesystem attribute.
src/main/java/org/gaul/s3proxy/nio2blob/AbstractNio2BlobStore.java