decryptpassword.py 文件源码

def add_to_params(self, parameters, value):
        """
        This gets called with the value of our ``--priv-launch-key``
        if it is specified.  It needs to determine if the path
        provided is valid and, if it is, it stores it in the instance
        variable ``_key_path`` for use by the decrypt routine.
        """
        if value:
            path = os.path.expandvars(value)
            path = os.path.expanduser(path)
            if os.path.isfile(path):
                self._key_path = path
                endpoint_prefix = \
                    self._operation_model.service_model.endpoint_prefix
                event = 'after-call.%s.%s' % (endpoint_prefix,
                                              self._operation_model.name)
                self._session.register(event, self._decrypt_password_data)
            else:
                msg = ('priv-launch-key should be a path to the '
                       'local SSH private key file used to launch '
                       'the instance.')
                raise ValueError(msg)