I recently installed flatpak to use the Lunar Client minecraft launcher using the linux development environment on chromebook however it seems unable to access the resourecepacks folder in .minecraft, so I can’t use resource packs, and it also seems unable to access it’s own mods folder so I can’t install mods anymore either. What is the best way to fix this, if it’s possible?
Lunar Client inability to access external folders
Due to being run in an sandbox, Lunar Client has no access to user files without explicit permission, only to its own files.
To break it down a bit:
Minecraft expects its files under ~/.minecraft. That folder is outside of the sandbox, so it is not accessible by Lunar Client.
Instead, each Flatpak app has an separate folder for data and configuration, located under ~/.var/app, so for Lunar Client it would be ~/.var/app/com.lunarclient.LunarClient. This is where files readable by Lunar Client are located.
Inside this folder, you should find a .minecraft folder. This folder is provided to the app in the sandbox as it would be under ~/.minecraft. So, while it may seem to the app as it accesses ~/.minecraft, it uses ~/.var/app/com.lunarclient.LunarClient/.minecraft instead.
The same applies for the Lunar Client folder, where ~/.lunarclient is found under ~/.var/app/com.lunarclient.LunarClient/.lunarclient.
So, in short:
Due to sandboxing, the folders are in a bit of an different location.
The easy solution is to just use the folders under ~/.var/app/com.lunarclient.LunarClient, as the app will use them.
Though you could use overrides to give the app permission to read ~/.minecraft if you wanted.