# File lib/buildr/packaging/artifact.rb, line 468
    def current_snapshot_repo_url(repo_url)
      begin
        metadata_path = "#{group_path}/#{id}/#{version}/maven-metadata.xml"
        metadata_xml = StringIO.new
        URI.download repo_url + metadata_path, metadata_xml
        metadata = REXML::Document.new(metadata_xml.string).root
        timestamp = REXML::XPath.first(metadata, '//timestamp')
        build_number = REXML::XPath.first(metadata, '//buildNumber')
        error "No timestamp provided for the snapshot #{to_spec}" if timestamp.nil?
        error "No build number provided for the snapshot #{to_spec}" if build_number.nil?
        return nil if timestamp.nil? || build_number.nil?
        snapshot_of = version[0, version.size - 9]
        repo_url + "#{group_path}/#{id}/#{version}/#{id}-#{snapshot_of}-#{timestamp.text}-#{build_number.text}.#{type}"
      rescue URI::NotFoundError
        nil
      end
    end