Multiple open issues related to permission

[icheered]

I noticed several people running into issues related to permissions, none of which are resolved. It might be a good idea to keep all communication in a single thread.

• Bootloop after updating from 2.0.15 to 2.0.21 (Stable) #556
• cannot create directory '/factorio/saves': Permission denied #555
• Error: filesystem error: copy_file "/factorio/temp/currently-playing/level.dat" failed: Permission denied #549
• Unable to run with Rootless Docker configuration. #496
• Docker for Windows Permissions Issues #501
• "Error Util.cpp:86: Operation not permitted" error when starting server on 1.1.107 #492
• 0.000 Error Util.cpp:83: filesystem error: status: Permission denied [/factorio/saves] #420

I noticed that purging the factoriotools image and re-pulling temporarily solved the permission issues. However after a while saving the game kept failing.

What I noticed is that even after running sudo chown -R 845:845 factorio_folder some files would be owned by user 100844 instead of 845 (run ls -la in the factorio folder and check the 3rd and 4th column). After chowning all files to user 100844 it does seem to work (for now).

I am running NixOS with docker-compose with docker in rootless mode.

[aSemy]

I've had a look, and have two observations. I'm not super up to date with Docker best practices, but they didn't match my understanding. Maybe someone can explain, or maybe they could indicate a solution.

1. I see the Dockerfile manually creates a user, but didn't see a USER instruction in the Dockerfile. Isn't that required?

2. Is it necessary for the account that runs the Factorio file to chown all files?

   factorio-docker/docker/Dockerfile

   Line 89 in 19e5dc7

   && chown -R "$USER":"$GROUP" /opt/factorio /factorio

   I can imagine this would be necessary for a zero-config option, but I suspect that's causing issues with systems that have other ways of configuring permissions. On my machine I need my user to retain ownership of the files, but I do grant read/write permissions to the Factorio user.