workflow.py 文件源码

def start_update(self):
        """Check for update and download and install new workflow file.

        .. versionadded:: 1.9

        See :ref:`guide-updates` in the :ref:`user-manual` for detailed
        information on how to enable your workflow to update itself.

        :returns: ``True`` if an update is available and will be
            installed, else ``False``

        """
        import update

        github_slug = self._update_settings['github_slug']
        # version = self._update_settings['version']
        version = str(self.version)

        if not update.check_update(github_slug, version, self.prereleases):
            return False

        from background import run_in_background

        # update.py is adjacent to this file
        update_script = os.path.join(os.path.dirname(__file__),
                                     b'update.py')

        cmd = ['/usr/bin/python', update_script, 'install', github_slug,
               version]

        if self.prereleases:
            cmd.append('--prereleases')

        self.logger.debug('Downloading update ...')
        run_in_background('__workflow_update_install', cmd)

        return True

    ####################################################################
    # Keychain password storage methods
    ####################################################################