Jinja2 template fails to render when it contains include statements

[mgades]

Deployment Type

Self-hosted

NetBox Version

v.4.3.1

Python Version

3.10

Steps to Reproduce

1. Create two Jinja2 template files ('router/main.j2' and 'common/base.j2'). Content could be empty or random text.
2. Add a local Data Source (eg. named "netconfig") with the path from the above file locations.
3. Add 'router/main.j2' as a Configuration Template and attach it to a device (eg. RTR1).
4. In the 'router/main.j2' file add the following: {%- include 'common/base.j2' %}
5. Sync the "netconfig" Data Source to update the changes in the file.
6. Go the the RTR1 device and click the Render Config tab.

Expected Behavior

I would expect the content from 'common/base.j2' to be included in the output on the screen.

It worked fine in v4.2.8 (before upgrading to 4.3.0 and 4.3.1).

Observed Behavior

The complete exception is provided below:

<class 'TypeError'>

no loader for this environment specified

Python version: 3.10.12
NetBox version: 4.3.1
Plugins: None installed

[dillon-conner]

Also having this issue, same symptoms. Have a github data source for config files with includes/extends.

Issue started with 4.3 upgrade, same template and data source. Persists in 4.3.1 release as of this morning.
Config template render fails with:

netbox-1               | Internal Server Error: /dcim/devices/3/render-config/
netbox-1               | Traceback (most recent call last):
netbox-1               |   File "/opt/netbox/venv/lib/python3.12/site-packages/django/core/handlers/exception.py", line 55, in inner
netbox-1               |     response = get_response(request)
netbox-1               |                ^^^^^^^^^^^^^^^^^^^^^
netbox-1               |   File "/opt/netbox/venv/lib/python3.12/site-packages/django/core/handlers/base.py", line 197, in _get_response
netbox-1               |     response = wrapped_callback(request, *callback_args, **callback_kwargs)
netbox-1               |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
netbox-1               |   File "/opt/netbox/venv/lib/python3.12/site-packages/django/views/generic/base.py", line 104, in view
netbox-1               |     return self.dispatch(request, *args, **kwargs)
netbox-1               |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
netbox-1               |   File "/opt/netbox/netbox/netbox/views/generic/base.py", line 26, in dispatch
netbox-1               |     return super().dispatch(request, *args, **kwargs)
netbox-1               |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
netbox-1               |   File "/opt/netbox/netbox/utilities/views.py", line 125, in dispatch
netbox-1               |     return super().dispatch(request, *args, **kwargs)
netbox-1               |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
netbox-1               |   File "/opt/netbox/netbox/utilities/views.py", line 39, in dispatch
netbox-1               |     return super().dispatch(request, *args, **kwargs)
netbox-1               |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
netbox-1               |   File "/opt/netbox/venv/lib/python3.12/site-packages/django/views/generic/base.py", line 143, in dispatch
netbox-1               |     return handler(request, *args, **kwargs)
netbox-1               |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
netbox-1               |   File "/opt/netbox/netbox/extras/views.py", line 936, in get
netbox-1               |     context = self.get_extra_context(request, instance)
netbox-1               |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
netbox-1               |   File "/opt/netbox/netbox/extras/views.py", line 972, in get_extra_context
netbox-1               |     rendered_config = config_template.render(context=context_data)
netbox-1               |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
netbox-1               |   File "/opt/netbox/netbox/extras/models/mixins.py", line 134, in render
netbox-1               |     output = render_jinja2(self.template_code, context, env_params)
netbox-1               |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
netbox-1               |   File "/opt/netbox/netbox/utilities/jinja2.py", line 59, in render_jinja2
netbox-1               |     return environment.from_string(source=template_code).render(**context)
netbox-1               |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
netbox-1               |   File "/opt/netbox/venv/lib/python3.12/site-packages/jinja2/environment.py", line 1295, in render
netbox-1               |     self.environment.handle_exception()
netbox-1               |   File "/opt/netbox/venv/lib/python3.12/site-packages/jinja2/environment.py", line 942, in handle_exception
netbox-1               |     raise rewrite_traceback_stack(source=source)
netbox-1               |   File "<template>", line 1, in top-level template code
netbox-1               | TypeError: no loader for this environment specified

[jnovinger]

Did a little debugging on this, the offending change appears to be after the v4.2.8/v4.2.9 tags and before the v4.3.0-beta1 tag. List of changes: v4.3.0-beta1...v4.2.8

[mgades]

Did a little debugging on this, the offending change appears to be after the v4.2.8/v4.2.9 tags and before the v4.3.0-beta1 tag. List of changes: v4.3.0-beta1...v4.2.8

Thanks @jnovinger - please let me know if you need further info from me...