nixos-config/modules/nix.nix

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{ config, lib, pkgs, ... }:
let
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# Adapted from https://nixos.wiki/wiki/Overlays
overlaysCompat = pkgs.writeTextFile {
name = "overlays-compat";
destination = "/overlays.nix";
text = ''
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.${config.networking.hostName}.config.nixpkgs.overlays
else [ ];
in
# Apply all overlays to the input of the current "main" overlay
foldl' (flip extends) (_: super) overlays self
'';
};
in
{
sops.secrets.binary-cache-secret-key = { };
sops.secrets.nix-netrc = {
group = "wheel";
mode = "0440";
};
nix = {
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# nix with flake support
package = pkgs.nixUnstable;
nixPath = [
"nixpkgs-overlays=${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 = ''
# Binary cache upload
secret-key-files = ${config.sops.secrets.binary-cache-secret-key.path}
netrc-file = ${config.sops.secrets.nix-netrc.path}
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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
daemonNiceLevel = 10;
daemonIONiceLevel = 5; # 0-7
};
}