cross-posted from: https://anarchist.nexus/post/93090
this post was submitted on 29 Aug 2025
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Info:
nixos-rebuild switch= build the new system configuration (from/etc/nixos/configuration.nixor flakes) and activate it immediately without reboot./nix/store.nixos-rebuild switch --rollback).So: "switch" means build + activate now
I never use nixos, but I just got intrusive thought to make that command get invoked automatically every time the config file is modified.
I'm only two days into Nixos, but I don't think that would be a problem. I am at 14 generations of my system already, and it asks me every boot which generation I want to start. It's trivial to scroll down and pick an earlier (working) version.
One thing that might be nice would be if that menu indicated how many times each generation had been booted and used for more than 10 min, so I could tell which ones were "real" versions and which were transitional.
I don’t have the command at hand but you can name versions.
Ooh that's handy.
NIXOS_LABEL="changed-some-settings" nixos-rebuild switch
Also, since you’re already 14 versions deep you should probably implement automatic “garbage collection”.
Will do. I'm worried about deleting the one good version while I'm still building the system.
Enjoy :)