[Feature request]: app cache folder location

[axet]

Checklist

• [X] I agree to follow the Code of Conduct that this project adheres to.
• [X] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Suggestion

Hello!

By default flatpak creates '$HOME/.var/app/[APPNAME]/cache' folder for each app. Those folders can be REALLY big. For example AndroidStudio cache folder size of 4GB.

I suggest to use system wide folder for caching, so it can be configured to use additional drive for caching not main SSD.

Use '$HOME/.cache/flatpak/apps/[APPNAME]' instead of '.var'?

[hfiguiere]

~/.cache is not in the sandbox. Using a "global" cache break the sandbox.

[axet]

Maybe application package (system libraries, user data) can be moved to custom path (sdcard)? Can flatpak app can be mounted dynamically when sdcard inserted. Which also will reduce size of /var/lib/flatpak.

[csnover]

This appears to be a duplicate of #5407, or at least the desired outcome is the same.

[chrisawi]

It's not exactly the same requested location (~/.var/cache vs ~/.cache), but yes, this is basically the same request.