# File lib/rbot/registry.rb, line 18
    def upgrade_data
      if File.exist?("#{@bot.botclass}/registry.db")
        log _("upgrading old-style (rbot 0.9.5 or earlier) plugin registry to new format")
        old = BDB::Hash.open("#{@bot.botclass}/registry.db", nil,
                             "r+", 0600)
        new = BDB::CIBtree.open("#{@bot.botclass}/plugin_registry.db", nil,
                                BDB::CREATE | BDB::EXCL,
                                0600)
        old.each {|k,v|
          new[k] = v
        }
        old.close
        new.close
        File.rename("#{@bot.botclass}/registry.db", "#{@bot.botclass}/registry.db.old")
      end
    end