nbgitpuller not showing as an extension

[banson-aiq]

Bug description

When using pip to install the nbgitpuller extension, the pip install completes successfully but nbgitpuller does not show up in the list of extensions. I have used these steps to successfully install theme-darcula, so I can't see why nbgitpuller is not working

Install...

sudo /opt/jupyterhub/bin/python3 -m pip install nbgitpuller

Check the extensions...

/opt/jupyterhub/bin/jupyter labextension list

`sys_prefix` level settings are read-only, using `user` level for migration to `lockedExtensions`
JupyterLab v4.1.0
/home/ubuntu/.local/share/jupyter/labextensions
        jupyterlab_pygments v0.3.0 enabled OK (python, jupyterlab_pygments)

/opt/jupyterhub/share/jupyter/labextensions
        @jupyter-widgets/jupyterlab-manager v5.0.9 enabled OK (python, jupyterlab_widgets)
        @telamonian/theme-darcula v4.0.0 enabled OK (python, theme-darcula)

How to reproduce

1. Follow these instructions to setup JupyterHub on Ubuntu22.04 https://github.com/jupyterhub/jupyterhub-the-hard-way/blob/35ddfb49ad81771551c6549696ccec960564d5e4/docs/installation-guide-hard.md

2. Set up the default conda environment for all Users, but do not setup user's own conda environments

3. As user ubuntu on the server run these commands to install & check the extension

   
   $ sudo /opt/jupyterhub/bin/python3 -m pip install nbgitpuller

$ /opt/jupyterhub/bin/jupyter labextension list sys_prefix level settings are read-only, using user level for migration to lockedExtensions JupyterLab v4.1.0 /home/ubuntu/.local/share/jupyter/labextensions jupyterlab_pygments v0.3.0 enabled OK (python, jupyterlab_pygments)

/opt/jupyterhub/share/jupyter/labextensions @jupyter-widgets/jupyterlab-manager v5.0.9 enabled OK (python, jupyterlab_widgets) @telamonian/theme-darcula v4.0.0 enabled OK (python, theme-darcula)

#### Expected behaviour

I was expecting the extension to show up in the list of extensions and be usable.

#### Actual behaviour

Extension is not showing in the list, and is not usable.

### Your personal set up
 - OS: ubuntu 20.04
 - Version(s):
$ /opt/jupyterhub/bin/jupyterhub --version
4.0.2

$ /opt/jupyterhub/bin/python --version
Python 3.10.12

<details><summary>Full environment</summary>
<!-- For reproduction, it's useful to have the full environment. For example, the output of `pip freeze` or `conda list` --->

$ /opt/jupyterhub/bin/pip freeze alembic==1.13.1 anyio==4.2.0 argon2-cffi==23.1.0 argon2-cffi-bindings==21.2.0 arrow==1.3.0 asttokens==2.4.1 async-generator==1.10 async-lru==2.0.4 attrs==23.2.0 Babel==2.14.0 beautifulsoup4==4.12.3 bleach==6.1.0 certifi==2024.2.2 certipy==0.1.3 cffi==1.16.0 charset-normalizer==3.3.2 comm==0.2.1 cryptography==42.0.2 debugpy==1.8.0 decorator==5.1.1 defusedxml==0.7.1 exceptiongroup==1.2.0 executing==2.0.1 fastjsonschema==2.19.1 fqdn==1.5.1 greenlet==3.0.3 h11==0.14.0 httpcore==1.0.2 httpx==0.26.0 idna==3.6 ipykernel==6.29.1 ipython==8.21.0 ipywidgets==8.1.1 isoduration==20.11.0 jedi==0.19.1 Jinja2==3.1.3 json5==0.9.14 jsonpointer==2.4 jsonschema==4.21.1 jsonschema-specifications==2023.12.1 jupyter-events==0.9.0 jupyter-lsp==2.2.2 jupyter-telemetry==0.1.0 jupyter_client==8.6.0 jupyter_core==5.7.1 jupyter_server==2.12.5 jupyter_server_terminals==0.5.2 jupyterhub==4.0.2 jupyterlab==4.1.0 jupyterlab-widgets==3.0.9 jupyterlab_pygments==0.3.0 jupyterlab_server==2.25.2 Mako==1.3.2 MarkupSafe==2.1.5 matplotlib-inline==0.1.6 mistune==3.0.2 nbclient==0.9.0 nbconvert==7.15.0 nbformat==5.9.2 nbgitpuller==1.2.0 nest-asyncio==1.6.0 notebook_shim==0.2.3 oauthlib==3.2.2 overrides==7.7.0 packaging==23.2 pamela==1.1.0 pandocfilters==1.5.1 parso==0.8.3 pexpect==4.9.0 platformdirs==4.2.0 prometheus-client==0.19.0 prompt-toolkit==3.0.43 psutil==5.9.8 ptyprocess==0.7.0 pure-eval==0.2.2 pycparser==2.21 Pygments==2.17.2 pyOpenSSL==24.0.0 python-dateutil==2.8.2 python-json-logger==2.0.7 PyYAML==6.0.1 pyzmq==25.1.2 referencing==0.33.0 requests==2.31.0 rfc3339-validator==0.1.4 rfc3986-validator==0.1.1 rpds-py==0.17.1 ruamel.yaml==0.18.5 ruamel.yaml.clib==0.2.8 Send2Trash==1.8.2 six==1.16.0 sniffio==1.3.0 soupsieve==2.5 SQLAlchemy==2.0.25 stack-data==0.6.3 terminado==0.18.0 theme-darcula==4.0.0 tinycss2==1.2.1 tomli==2.0.1 tornado==6.4 traitlets==5.14.1 types-python-dateutil==2.8.19.20240106 typing_extensions==4.9.0 uri-template==1.3.0 urllib3==2.2.0 wcwidth==0.2.13 webcolors==1.13 webencodings==0.5.1 websocket-client==1.7.0 widgetsnbextension==4.0.9

</details>

<details><summary>Configuration</summary>
<!--
For JupyterHub, especially include information such as what Spawner and Authenticator are being used.
Be careful not to share any sensitive information.
You can paste jupyterhub_config.py below.
To exclude lots of comments and empty lines from auto-generated jupyterhub_config.py, you can do:
    grep -v '\(^#\|^[[:space:]]*$\)' jupyterhub_config.py
-->

```python
c = get_config()  #noqa
c.Spawner.default_url = '/lab'

Logs

``` # paste relevant logs here, if any ```

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[consideRatio]

I think maybe you installed nbgitpuller in the jupyterhub environment, and checked for it as a jupyterlab extension rather than a jupyter-server extension.

nbgitpuller is a jupyter-server extension that should reside in the user environment, so install it in the user's Python environment and check for it with jupyter server extension list.

[banson-aiq]

Yes that was it, after installing in the shared user's conda environment and using the server extension command I can see it. Thank you!

sudo /opt/conda/envs/python/bin/python -m pip install nbgitpuller

/opt/conda/envs/python/bin/python -m jupyter server extension list
Config dir: /home/ubuntu/.jupyter

Config dir: /opt/conda/envs/python/etc/jupyter
    jupyter_lsp enabled
    - Validating jupyter_lsp...
      jupyter_lsp 2.2.2 OK
    jupyter_server_terminals enabled
    - Validating jupyter_server_terminals...
      jupyter_server_terminals 0.5.2 OK
    jupyterlab enabled
    - Validating jupyterlab...
      jupyterlab 4.1.0 OK
    nbgitpuller enabled
    - Validating nbgitpuller...
      nbgitpuller 1.2.0 OK
    notebook_shim enabled
    - Validating notebook_shim...
A `_jupyter_server_extension_points` function was not found in notebook_shim. Instead, a `_jupyter_server_extension_paths` function was found and will be used for now. This function name will be deprecated in future releases of Jupyter Server.
      notebook_shim  OK

Config dir: /usr/local/etc/jupyter