Extension development on windows

JupyterLab
1

Hi, my colleague, who does the development on windows, is unable to try out the sample extensions bcos of the following error
(jupyterlab-ext) D:\Projects\jupyterA>jupyter labextension develop --overwrite .
Installing d:\projects\jupytera\jupyterA\labextension → jupyterA
Symlinking: C:\Users\olpit\miniconda3\envs\jupyterlab-ext\share\jupyter\labextensions\jupyterA → d:\projects\jupytera\jupyterA\labextension
An error occured.
OSError: [WinError 1314] A required privilege is not held by the client: ‘d:\projects\jupytera\jupyterA\labextension’ → ‘C:\Users\olpit\miniconda3\envs\jupyterlab-ext\share\ju
pyter\labextensions\jupyterA’
See the log file for details: C:\Users\olpit\AppData\Local\Temp\jupyterlab-debug-ahq3s9.log

Online search hasnt helped him yet. Whats the way out here?

2

Have you looked at the log file? It might be helpful to post the contents here.

3

Reading the tea leaves there:

  • i see files on D: and C:, even if whoever was running that did have admin perms, that’s game over for symlinks
    • Since conda is in play, I’d highly recommend creating the jupyterlab-ext env with --prefix right inside the working directory (but added to .gitignore!)
  • like it says, one needs some perms to create symlinks on windows.
    • the official docs are pretty sparse
    • but a quick google search for windows symlink permissions yields a fair amount of results

It could be scripting a higher-level build tool that watches the build package.json and redeploys it to {sys.prefix}/share/jupyter/labextensions/<@org/pkg> would be easier.

4

The symlinks issue was also discussed in Add helper for Windows on `jupyter labextension develop` · Issue #9564 · jupyterlab/jupyterlab · GitHub and the docs link is Enable your device for development - Windows applications | Microsoft Docs. @rising_star if you confirm that this helps, then adding this to documentation to address Add helper for Windows on `jupyter labextension develop` · Issue #9564 · jupyterlab/jupyterlab · GitHub seems like a good first issue and I’m sure that community will appreciate that :slight_smile:

5

Thanks a lot @krassowski , my bad, i was under the impression that the colleague has done the research work, i will keep that in mind.