code: def _homedir_setter(self, directory):
          
          if not directory:
              log.debug("GPGBase._homedir_setter(): Using default homedir: '%s'"
                        % _util._conf)
              directory = _util._conf
  
          hd = _parsers._fix_unsafe(directory)
          log.debug("GPGBase._homedir_setter(): got directory '%s'" % hd)
  
          if hd:
              log.debug("GPGBase._homedir_setter(): Check existence of '%s'" % hd)
              _util._create_if_necessary(hd)
  
          if self.ignore_homedir_permissions:
              self._homedir = hd
          else:
              try:
                  log.debug("GPGBase._homedir_setter(): checking permissions")
                  assert _util._has_readwrite(hd), \
                      "Homedir '%s' needs read/write permissions" % hd
              except AssertionError as ae:
                  msg = ("Unable to set '%s' as GnuPG homedir" % directory)
                  log.debug("GPGBase.homedir.setter(): %s" % msg)
                  log.debug(str(ae))
                  raise RuntimeError(str(ae))
              else:
                  log.info("Setting homedir to '%s'" % hd)
                  self._homedir = hd
docs: Set the directory to use as GnuPG's homedir.
  
          If unspecified, use $HOME/.config/python-gnupg. If specified, ensure
          that the ``directory`` does not contain various shell escape
          characters. If ``directory`` is not found, it will be automatically
          created. Lastly, the ``direcory`` will be checked that the EUID has
          read and write permissions for it.
  
          :param str directory: A relative or absolute path to the directory to
                              use for storing/accessing GnuPG's files, including
                              keyrings and the trustdb.
          :raises: :exc:`~exceptions.RuntimeError` if unable to find a suitable
                   directory to use.