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Why block muting the OS?
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this post was submitted on 24 Jul 2024
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Immutable in this context refers to an OS that can't be changed while running. Steam deck does something like that. Basically the all of the OS system files are read only, so that the user or some malware can't Bork the system. The only parts that are writable are the users profile directory and the logs.
You can still receive updates and install apps. It's just that that's handled a bit differently than with a standard OS.
E.g. it could be that the OS provider only issues complete updates, and then you either have to reboot. This is the case with steam os on the steam deck. The System portion of the OS is mounted read only during use.
Sounds pretty secure except for at the update stage, but you said that's handled differently so maybe that's more secure too.
Depending on the use case there's usually a temporary system that's there only to take the update from the user partition and apply it to the system partition. So even if you bork the update it'll still boot into that environment and install the system again. Valve does provide bootable images to put on a USB stick if you do break it pretty bad. It's just a PC, it doesn't do much to stop you from wiping the disk. The route Android took is A/B devices, when you're using A you update B and then reboot into B, then the next update you'll be updating the A partition and reboot into it. Plus if the next one fails to boot for some reason you can revert to the old version as if nothing happened, and retry the update from scratch. Except Samsung, because I don't know I guess they want to turn the updating into a whole experience of anticipation or whatever crap reason they have for it.
IIRC, Samsung recently announced they're moving to A/B partitioning as well.