services/nix/nix.nix


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{
  config,
  lib,
  pkgs,
  ...
}: {
  nix = {
    gc = {
      automatic = true;
      dates = "daily";
      options = "--delete-older-than 3";
    };
    settings = {
      auto-optimise-store = true;
      experimental-features = ["nix-command" "flakes"];
      fallback = true;

      keep-failed = true; #keep failed tmp build dirs
      pure-eval = true; # restrict file system and network access to  hash
    };
  };
}