Posted on: 20/02/2020
I remember being incredibly excited to try out Nix. But I initially had a lot of confusion over packages/channels/generations - hence this post!
A channel refers to a git branch in this repo: https://github.com/NixOS/nixpkgs-channels
Note: all these commands could be user specific, hence if you run them as root / sudo you may get different results.
You can view your existing channels with:
sudo nix-channel --list nixos https://nixos.org/channels/nixos-19.09 unstable https://nixos.org/channels/nixpkgs-unstable
You can “pull” the latest commits into your channels with
sudo nix-channel --update
If you create a new generation, it will reference the commits that exist in your local definition of the channel.
sudo nixos-rebuild build
Your regular “user” (or even root!) has a nix environment separate from your Nixos “system” environment (also a nix environment).
To list the generations of your system:
nix-env --list-generations --profile /nix/var/nix/profiles/system
To list the generations of your user:
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