[ZoomZoomZoom]

Not every bug manifests itself right after reboot. You can easily have a bunch of generations you just think are ok.

The point is entirely different: if you update the channel-list you need the network for any changes to the configuration and I don't know of a way to go back to an earlier channel state.

[rgoulter]

> The point is entirely different: if you update the channel-list you need the network for any changes to the configuration and I don't know of a way to go back to an earlier channel state.

`nix-channel` does have a `--rollback` flag to it.

However, I feel that Nix Flakes would allow you a better experience. With nix flakes, the revision of the nixpkgs input is persisted in a lockfile. You could check this file in somewhere, and then getting your working directory back to a known working state is much easier.

[colordrops]

Once again, why wouldn't you keep the last few generations around? No network is required to use them.

[ZoomZoomZoom]

Answering your question: ENOSPC

This is not a support forum and we're not trying to diagnose and fix someone's issue. It's just not that hard to get into trouble with NixOS and there's still a room for improvement, that's all.

Reading on `nix-channel --rollback`, it should definitely help in some cases and I don't know how I missed it, maybe the docs weren't clear it's not tied to config generations or I just didn't pay enough attention.

[throwamon]

> You can easily have a bunch of generations you just think are ok.

Unless you erase your darlings: https://grahamc.com/blog/erase-your-darlings