No items are displayed in the launcher

[fieeman]

Hello!

this is my first issue on github, if I'm making any mistake, let me know :)

I installed using pip

and using the jupyter labextension list command I can see that it is enabled

JupyterLab v3.5.3
/opt/tljh/user/share/jupyter/labextensions
        jupyter_app_launcher v0.1.5 enabled OK (python, jupyter_app_launcher)
        jupyterlab_pygments v0.2.2 enabled OK (python, jupyterlab_pygments)
        @jupyter-widgets/jupyterlab-manager v3.1.1 enabled OK (python, jupyterlab_widgets)
        @jupyterlab/server-proxy v3.2.2 enabled OK
        @jupyter-server/resource-usage v0.6.4 enabled OK (python, jupyter-resource-usage)

jupyter serverextension list

config dir: /opt/tljh/user/etc/jupyter
    jupyter_server_proxy  enabled
    - Validating...
      jupyter_server_proxy  OK
    jupyter_app_launcher  enabled
    - Validating...
      jupyter_app_launcher 0.1.5 OK
    jupyter_nbextensions_configurator  enabled
    - Validating...
      jupyter_nbextensions_configurator 0.6.1 OK
    jupyter_resource_usage  enabled
    - Validating...
      jupyter_resource_usage 0.6.4 OK
    jupyterlab  enabled
    - Validating...
      jupyterlab 3.5.3 OK
    nbgitpuller  enabled
    - Validating...
      nbgitpuller 1.1.1 OK
    nteract_on_jupyter  enabled
    - Validating...
      nteract_on_jupyter 2.1.3 OK

using the jupyter --path command, I can see the following

config:
    /root/.jupyter
    /root/.local/etc/jupyter
    /opt/tljh/user/etc/jupyter
    /usr/local/etc/jupyter
    /etc/jupyter
data:
    /root/.local/share/jupyter
    /opt/tljh/user/share/jupyter
    /usr/local/share/jupyter
    /usr/share/jupyter
runtime:
    /root/.local/share/jupyter/runtime

I have created the folder jupyter_app_launcher in /root/.jupyter and in /opt/tljh/user/etc/jupyter and created the config.yaml file with this content

- title: URL example
  description: Example of opening a URL in a tab
  source: https://jupyterlab.readthedocs.io/en/stable/
  type: url
  catalog: Other
  args:
      sandbox: [ 'allow-same-origin', 'allow-scripts', 'allow-downloads', 'allow-modals', 'allow-popups']

after doing all this and restarting the service, I don't see any new items in the launcher and in the browser console I see this message

JupyterLab extension jupyter_app_launcher is activated!

so I don't know what's going on, if you could give me some suggestions I would be very grateful.

[trungleduc]

Hi, thank you for your report. Can you try to set the JUPYTER_APP_LAUNCHER_PATH environment variable with the path to the directory containing the config.yaml file then start JupyterLab again?

[trungleduc]

And the config file should be in the data section of the jupyter --path command. Can you try moving the YAML file to /opt/tljh/user/share/jupyter/jupyter_app_launcher/config.yaml?

[fieeman]

Hello thanks for your suggestions. I have moved the config.yaml file to this /opt/tljh/user/share/jupyter/jupyter_app_launcher/ folder

ls -la
total 32
drwxr-xr-x  8 root jupyterhub-users 4096 Jan 26 18:10 .
drwxr-xr-x 20 root jupyterhub-users 4096 Jan 25 17:30 ..
drwxr-xr-x  2 root jupyterhub-users 4096 Jan 26 15:58 jupyter_app_launcher
drwxr-xr-x  3 root jupyterhub-users 4096 Jan 25 17:30 kernels
drwxr-xr-x  5 root jupyterhub-users 4096 Jan 25 17:30 lab
drwxr-xr-x  7 root jupyterhub-users 4096 Jan 26 14:24 labextensions
drwxr-xr-x  3 root jupyterhub-users 4096 Jan 25 17:30 nbconvert
drwxr-xr-x  5 root jupyterhub-users 4096 Jan 26 14:24 nbextensions

and I define the environment variable as follows JUPYTER_APP_LAUNCHER_PATH="/opt/tljh/user/share/jupyter/jupyter_app_launcher/"

echo $JUPYTER_APP_LAUNCHER_PATH
/opt/tljh/user/share/jupyter/jupyter_app_launcher/

and now it works, thank you very much for your help.

[trungleduc]

Great! You only need to define the environment variable if you want to place your config file outside of the jupyter data path. In your case, placing the file in /opt/tljh/user/share/jupyter/jupyter_app_launcher/ is enough.