I bought a new SSD. I tried to use my NixOS configuration in this new SSD. Since I converted my config to use flake, I tried this command inside the folder with flake.nix:
nixos-install --flake .#watchmen
It didn’t work, I don’t remember the error but it was something to do with restrict eval. I tried passing the github repo as flake and it worked partially:
It gave a error after I set the root password. It install almost my system, like gnome and other stuffs, but nvidia not. So to install I copied configuration.nix to /etc/nixos and used nixos-install without nix-flakes. It worked.
After the installation and logged in the new system I updated the system and installed my user packages too using flakes correctly. But I every nix command that I use it show this warning: warning: unknown setting 'extra-sandbox-paths'. This setting is not set in any of my configurations. Is there a way to get away with this warning?
I can’t remember if this is new or not, but I feel like I just started seeing it myself (maybe only in certain edge cases?) and someone did just open an issue on it: https://github.com/NixOS/nixpkgs/issues/102632
I ran into several issues while having package = pkgs.nixUnstable; in my nix configuration.
One of them was warning: unknown setting 'extra-sandbox-paths'. But also segmentation faults while rebuilding my nixos and build errors with some of the hardened.nix options too.
Therefore I decided to switch back to the 20.09. defaults: nix.package = pkgs.nix;. Then all of the problems disappeared.
I guess some of the unstable packages are literally unstable at present.
That has to do more with feature gating of the unstable nix package. Unless you really want to use flakes, or some of the new nix commands; there’s little difference between them for most users.
