nixos/open-webui: try to fix the database readonly issue

[drupol]

I wish I could understand why this issue is happening right now, never had the issue before.

Anyway, this should fix #430433 but there might be data losses.

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[74k1]

Attribute statedir is missing. You probably meant to write stateDir.

[74k1]

This seems to have fixed the readonly db issue.

I already lost my webui.db before while upgrading as mentioned in the addressed issue already.

I'm now able to setup everything again at least! Thanks a lot 😄

[drupol]

Cool, I'll rebase this properly when I'm back at my office.

[MayNiklas]

I have not yet deleted my database.
For me, this change does not fix the issue (I'm on nixos-unstable-small with already contains this merge).
I'll guess this won't work without data losses?

[74k1]

@MayNiklas You can try setting the changes from here manually in your own config (before updating to 0.6.18) like this:

services.open-webui = {
	enable = true;
	...
	environment = {
		STATIC_DIR = "${config.services.open-webui.stateDir}/static";
		DATA_DIR = "${config.services.open-webui.stateDir}/data";
		HF_HOME = "${config.services.open-webui.stateDir}/hf_home";
		SENTENCE_TRANSFORMERS_HOME = "${config.services.open-webui.stateDir}/transformers_home";
	};
};

then moving your data (webui.db cache/* uploads/* vector_db/*) from ${cfg.stateDir} into ${cfg.stateDir}/data/

sudo cp /var/lib/open-webui/webui.db /var/lib/open-webui/data
sudo cp -r /var/lib/open-webui/cache /var/lib/open-webui/data
sudo cp -r /var/lib/open-webui/uploads /var/lib/open-webui/data
sudo cp -r /var/lib/open-webui/vector_db /var/lib/open-webui/data

and finally, try to update to the 0.6.18 version of open-webui.

However, I'm not entirely sure if this will work as I've lost my own data. Make sure to have a backup at least. 😄

I've just confirmed with @pinage404 that this method works without data loss!

[drupol]

I still don't understand why moving stuff from one directory into a subdirectory would make things magically work. Can you explain?

[74k1]

I unfortunately also have no idea why this change suddenly seems to work.

When testing this PR, I noticed, new data (databases, etc.) would be saved and written under /var/lib/open-webui/data (as per DATA_DIR). This prompted me to test the behaviour with upgrading as well. And lo and behold, it worked.

#430433 (comment) mentions, that it was just to match upstream defaults.

Happy to test anything if wanted. 👍

[drupol]

Then we have no garantee that the issue won't show up again?

[74k1]

It's really a mystery to me as well.
I'm hopeful that this settles it, as it's now at least "upstream defaults" and therefore more reproducible upstream as well (i hope?).