Have you tried OpenSnitch
this post was submitted on 24 Sep 2023
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SteamDeckPirates
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Discuss piracy on Valve's portable handheld - the Steam Deck.
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Thanks for the suggestion, I think the main issue is doing it on the Steam Deck. On a native Linux machine it's easier. I don't see a way to install OpenSnitch on the Steam Deck with the read-only file system and whatnot. I think a pi-hole and block DNS might be easier than trying to mess with SteamOS.
You can't install applications on steam deck and there is a read only file system???? Whaaaatttt???????
Edit: I asked a friend that has a steam deck, he explained you can easily disable the read-only system, do whatever you want on a Linux system and reenable it afterwards.
From what i understand any changes to the system outside of the userland will be overwritten after a SteamOS update.
That is correct. The best case is to write a script to make your desired changes, and then run it after each system update.
My own use-case is that I have a NFS mount-point for my Steam Deck to use extra storage on my NAS. After the first time I figured out how to get it mounted, I made a script to disable read-only filesystem, make all the changes to the system, and then re-enable read-only filesystem. After every system update, I just run that script once.