I’m trying to understand
stateVersion. There’s the clear recommendation to just not change that - for example, in the nixos manual.
Most users should never change this value after the initial install, for any reason, even if you’ve upgraded your system to a new NixOS release.
However, this just doesn’t make sense to me - things do get old, and the system state can’t magically be an exception. There is the clarification in the manual that
This value does not affect the Nixpkgs version your packages and OS are pulled from, so changing it will not upgrade your system.
However, just a few paragraphs earlier, there is the seemingly contradictory
For example, if NixOS version XX.YY ships with AwesomeDB version N by default, and is then upgraded to version XX.YY+1, which ships AwesomeDB version N+1, the existing databases may no longer be compatible, causing applications to fail, or even leading to data loss.
What happens when AwesomeDB version N reaches end of life? Or the package gets broken, because it’s too old and too difficult to keep fixing?
My point is, the manual states that there’s no problem if
stateVersion is old, and it doesn’t relate to system upgrades - and I don’t distrust the manual - but it’s confusing me and I’d like to find a more complete explanation of how that works. But I couldn’t find one anywhere.