def _update_secrets(self):
        '''update secrets will take a secrets credential file
           either located at .sregistry or the environment variable
           SREGISTRY_CLIENT_SECRETS and update the current client 
           secrets as well as the associated API base. For the case of
           using Docker Hub, if we find a .docker secrets file, we update
           from there.
        '''

        # If the user has defined secrets, use them
        credentials = self._get_setting('SREGISTRY_DOCKERHUB_SECRETS')

        # First try for SINGULARITY exported, then try sregistry
        username = self._get_setting('SINGULARITY_DOCKER_USERNAME')
        password = self._get_setting('SINGULARITY_DOCKER_PASSWORD')
        username = self._get_setting('SREGISTRY_DOCKERHUB_USERNAME', username)
        password = self._get_setting('SREGISTRY_DOCKERHUB_PASSWORD', password)

        # Option 1: the user exports username and password
        auth = None
        if username is not None and password is not None:
            auth = basic_auth_header(username, password)
            self.headers.update(auth)
        
        # Option 2: look in .docker config file
        if credentials is not None and auth is None:
            if os.path.exists(credentials):
                credentials = read_json(credentials)

                # Find a matching auth in .docker config
                if "auths" in credentials:
                    for auths, params in credentials['auths'].items():
                        if self._base in auths:
                            if 'auth' in params:
                                auth = "Basic %s" % params['auth']
                                self.headers['Authorization'] = auth


                # Also update headers
                if 'HttpHeaders' in credentials:
                    for key, value in credentials['HttpHeaders'].items():
                        self.headers[key] = value

            else:
                bot.warning('Credentials file set to %s, but does not exist.')
update secrets will take a secrets credential file
           either located at .sregistry or the environment variable
           SREGISTRY_CLIENT_SECRETS and update the current client 
           secrets as well as the associated API base. For the case of
           using Docker Hub, if we find a .docker secrets file, we update
           from there.