nixos-config/modules/nix.nix

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{ config, inputs, lib, pkgs, ... }:
let
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# Adapted from https://nixos.wiki/wiki/Overlays
overlaysCompat = pkgs.writeTextFile {
name = "overlays-compat";
destination = "/overlays.nix";
text = /* nix */ ''
self: super:
with super.lib;
let
# Load the system config and get the `nixpkgs.overlays` option
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# This fails gracefully if getFlake is not available
overlays = if builtins.hasAttr "getFlake" builtins
then (builtins.getFlake "/var/src/config").nixosConfigurations.${config.networking.hostName}.config.nixpkgs.overlays
else [ ];
in
# Apply all overlays to the input of the current "main" overlay
foldl' (flip extends) (_: super) overlays self
'';
};
in
{
nix = {
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# nix with flake support
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package = pkgs.nixFlakes;
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registry = with inputs; {
nixpkgs.flake = nixpkgs;
nixpkgs-unstable.flake = nixpkgs-unstable;
};
nixPath = [
"nixpkgs=${inputs.nixpkgs}"
"nixpkgs-overlays=${overlaysCompat}"
];
# Make sudoers trusted nix users
trustedUsers = [ "@wheel" ];
# On-the-fly optimisation of nix store
autoOptimiseStore = true;
extraOptions = ''
experimental-features = nix-command flakes
'' + lib.optionalString config.sbruder.full ''
# Keep output of derivations with gc root
keep-outputs = true
keep-derivations = true
'';
# Make nix build in background less noticeable
daemonCPUSchedPolicy = "batch";
daemonIOSchedPriority = 5; # 0-7
};
nixpkgs.overlays = with inputs; [
self.overlays.default
nixpkgs-overlay.overlay
(final: prev: {
unstable = import nixpkgs-unstable {
inherit (config.nixpkgs)
config
overlays
system;
};
})
];
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environment.systemPackages = with pkgs; [
cached-nix-shell
];
}