templating.py 文件源码

def __init__(self, templates_dir, openstack_release):
        if not os.path.isdir(templates_dir):
            log('Could not locate templates dir %s' % templates_dir,
                level=ERROR)
            raise OSConfigException

        self.templates_dir = templates_dir
        self.openstack_release = openstack_release
        self.templates = {}
        self._tmpl_env = None

        if None in [Environment, ChoiceLoader, FileSystemLoader]:
            # if this code is running, the object is created pre-install hook.
            # jinja2 shouldn't get touched until the module is reloaded on next
            # hook execution, with proper jinja2 bits successfully imported.
            if six.PY2:
                apt_install('python-jinja2')
            else:
                apt_install('python3-jinja2')