Bwrap Questions

[GrootBlouNaai]

Hi Kron,

Awesome project. I was going through the scripts to try understand bwrap and dwarfs better. I play my games compressed in dwarfs archives and I wanted to check if you knew if dwarfs is interfering or if I am just not using bwrap correctly.

An example game would be a paradox game where the game writes to ~/.paradoxlauncher
I am trying to use bwrap to prevent the creation of ~/.paradoxlauncher and redirect the output to ~/.config/paradoxlauncher

My attempted usage was:
Mount game, overlayfs etc
Cd game directory then bwrap --bind / / --dev /dev --bind ~/.config/paradoxlauncher ~/.paradoxlauncher ./"dowser" "$@"

The files are redirect but the folder is still created in my HOME directory which is what I trying to avoid. Its likely not related to dwarfs as I am doing that before the sandbox

Thanks in advance for any assistance

[Kron4ek]

Hi,

This is normal, both the source directory/file and destination directory/file must exist for binding to work, this is why bubblewrap automatically creates ~/.paradoxlauncher in your example.

If you want to avoid this, you can mount your HOME directory as tmpfs:

$ cd /path/to/game/directory
$ bwrap --bind / / --dev /dev --tmpfs "${HOME}" --bind /path/to/game/directory /path/to/game/directory --bind ~/.config/paradoxlauncher ~/.paradoxlauncher ./"dowser" "$@"

It will still create ~/.paradoxlauncher, but you will not see it in your real HOME directory.

[GrootBlouNaai]

Thank you so much for explaining, and even correcting my command for me. I clearly didn't get how bwrap worked in that aspect.