Remove flatpak filesystem permissions

[sonnyp]

Fixes #413

I found several issues with hardcoded paths so I will end a PR for that after.

[mirkobrombin]

the only "problem" I found is with wine not being able to open or save files from/in any path due to the new permissions

[mirkobrombin]

I think the second point is the better choice but should be implemented only for flatpak users as other packages has not these restrictions: #413 (comment)

[sonnyp]

@mirkobrombin so you mean

Remove all filesystem permissions and instruct users to use Flatseal if they need a permission for a Windows app

How do you feel about instructions in the README.md of the Flathub Bottles repository for now?

[mirkobrombin]

That may be fine but most users won't reach that repository. Perhaps it is better to at least allow access to the home folder. What do you think?

I don't like the idea of ​​exposing the home but I'm afraid no user will appreciate this change and maybe it's too difficult to find that information.

[mirkobrombin]

Maybe the third option is the best

Let users pick folders (via the portal) which are exposed to a Bottle via a symbolic link in the wine prefix (is that even possible?)

With a simple tutorial the user will be introduced to the new feature.

[sonnyp]

Nah, either we say "sandboxed" and we provide a way for users to punch holes at will. Or we say "Bottles needs fs" in which case we might as well leave gvfs, /run/media and so on.

I'm strongly in favor of the first even if it's more work. If users don't care about sandboxing they can use AppImage, Snap, distribution package, ...

What about we show a "Give filesystem access" button in the bottle to flatpak users that opens the documentation on how to for now?

Later (no promises) I would like to investigate into using the documen portal for this. There is a persistent option https://github.com/flatpak/xdg-desktop-portal/blob/89d2197002f164d02d891c530dcaa2808f27f593/data/org.freedesktop.portal.Documents.xml#L73

Related: flatpak/xdg-desktop-portal#133

[mirkobrombin]

Yes, I think it's a good idea to add the button.

[mirkobrombin]

We should merge and open a new issue for button documentation. Is it ok?

[sonnyp]

Yes, please go ahead. I will take care of creating the issue - I want to give it some thoughts with a concrete proposal, and it's tracked in #413 anyway.