[WIP] adding uninstallation script

[choldgraf]

• Add / update documentation
• Add tests

This PR is meant to add an "uninstall" argument to the tljh-config tool. Here are some open questions:

1. Can it really delete everything without breaking itself in the middle of deleting things?
2. Can it delete the JupyterHub without really confusingly breaking someone's session if they're typing from a Jupyter Notebook server terminal (or jupyter lab).
3. Is the only thing we'd need to delete the /opt/tljh folder?
4. Should user directories be deleted by default

Depending on the answers to 1 and 2, I may or may not be +1 on this feature being added :-)

closes #128 if it's merged

[yuvipanda]

Thanks for opening this!

I don't know the answer to (1) :)

Answer to (2) is most definitely shit is gonna fuck up in weird ways.

https://the-littlest-jupyterhub.readthedocs.io/en/latest/topic/installer-actions.html has answers to (3). Short answer is 'a lot more'.

(4) is for sure no.

I'd also like this to be tljh-uninstall, in a file of its own rather than rolled into tljh-config (which should only do configuration related things).

It's also unclear how this should interact with the plugin mechanisms added in #127.

[choldgraf]

I'm gonna close this, because we decided in #128 that it'd be better to capture this use-case with good documentation rather than a one-click solution!

[ptiwari2407]

@choldgraf , you closed the previous one by pointing to this and now you close this one and pointing to another thread. This is ridiculous. Where is the right solution to uninstall?

[MridulS]

https://tljh.jupyter.org/en/latest/topic/installer-actions.html has documentation about reverting the actions of the installation script. If you have a VM, the recommended way is to start with a fresh VM (https://tljh.jupyter.org/en/latest/topic/installer-actions.html#removing-tljh)