Translations:Flakes/191/en

Nix configuration

It is possible to override the global Nix configuration set in your nix.conf file for the purposes of evaluating a flake. This can be useful, for example, for setting up binary caches specific to certain projects, while keeping the global configuration untouched. The flake file can contain a nixConfig attribute with any relevant configuration settings supplied. For example, enabling the nix-community binary cache would be achieved by:

❄︎ flake.nix

{
  ...
  nixConfig = {
    extra-substituters = [
      "https://nix-community.cachix.org"
    ];
    extra-trusted-public-keys = [
      "nix-community.cachix.org-1:...="
    ];
  }
}

Note: If you are used to configuring your Nix settings via the NixOS configuration, these options are under nix.settings and not nix. For example, you cannot specify the automatic storage optimisation under nix.optimisation.enable.