docs: def main():
      """Main entry point"""
      parser = OptionParser()
      parser.add_option('-a', '--hostname',
                        help='ClamAV source server hostname',
                        dest='hostname',
                        type='str',
                        default='db.de.clamav.net')
      parser.add_option('-r', '--text-record',
                        help='ClamAV Updates TXT record',
                        dest='txtrecord',
                        type='str',
                        default='current.cvd.clamav.net')
      parser.add_option('-w', '--work-directory',
                        help='Working directory',
                        dest='workdir',
                        type='str',
                        default='/var/spool/clamav-mirror')
      parser.add_option('-d', '--mirror-directory',
                        help='The mirror directory',
                        dest='mirrordir',
                        type='str',
                        default='/srv/www/clamav')
      parser.add_option('-u', '--user',
                        help='Change file owner to this user',
                        dest='user',
                        type='str',
                        default='nginx')
      parser.add_option('-g', '--group',
                        help='Change file group to this group',
                        dest='group',
                        type='str',
                        default='nginx')
      parser.add_option('-l', '--locks-directory',
                        help='Lock files directory',
                        dest='lockdir',
                        type='str',
                        default='/var/lock/subsys')
      parser.add_option('-v', '--verbose',
                        help='Display verbose output',
                        dest='verbose',
                        action='store_true',
                        default=False)
      options, _ = parser.parse_args()
      try:
          lockfile = os.path.join(options.lockdir, 'clamavmirror')
          with open(lockfile, 'w+') as lock:
              fcntl.lockf(lock, fcntl.LOCK_EX | fcntl.LOCK_NB)
              work(options)
      except IOError:
          info("=> Another instance is already running")
          sys.exit(254)