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.${config.networking.hostName}.config.nixpkgs.overlays
else [ ];
in
# Apply all overlays to the input of the current "main" overlay
foldl' (flip extends) (_: super) overlays self
'';
};
in
{
sops.secrets = lib.mkIf config.sbruder.trusted {
binary-cache-secret-key = { };
nix-netrc = {
group = "wheel";
mode = "0440";
};
};
nix = {
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# nix with flake support
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package = pkgs.nixFlakes;
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registry = with inputs; {
nixpkgs.flake = nixpkgs;
nixpkgs-unstable.flake = nixpkgs-unstable;
};
nixPath = [
"nixpkgs=${inputs.nixpkgs}"
"nixpkgs-overlays=${overlaysCompat}"
];
# Make sudoers trusted nix users
trustedUsers = [ "@wheel" ];
binaryCaches = [
"https://nix-cache.sbruder.de/"
];
binaryCachePublicKeys = [
"nix-cache.sbruder.de-1:bU13eF6IMMW2hgO7StgB6JCAoZPeAQ27NAzV0kru1XM="
];
# On-the-fly optimisation of nix store
autoOptimiseStore = true;
extraOptions = ''
experimental-features = nix-command flakes
'' + lib.optionalString config.sbruder.trusted ''
# Binary cache upload
secret-key-files = ${config.sops.secrets.binary-cache-secret-key.path}
netrc-file = ${config.sops.secrets.nix-netrc.path}
'' + lib.optionalString config.sbruder.full ''
# Keep output of derivations with gc root
keep-outputs = true
keep-derivations = true
'';
} // (if (builtins.compareVersions config.system.nixos.release "21.11" != -1) then {
# Make nix build in background less noticeable
daemonCPUSchedPolicy = "batch";
daemonIOSchedPriority = 5; # 0-7
} else {
# TODO 21.11: remove
daemonNiceLevel = 10;
daemonIONiceLevel = 5; # 0-7
});
nixpkgs.overlays = with inputs; [
self.overlay
nixpkgs-overlay.overlay
(final: prev: {
unstable = import nixpkgs-unstable {
inherit (config.nixpkgs)
config
overlays
system;
};
})
AriaNg.overlay
];
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environment.systemPackages = with pkgs; [
cached-nix-shell
];
}