102 lines
3 KiB
Nix
102 lines
3 KiB
Nix
# Core Nix configuration
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{
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config,
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inputs,
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lib,
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pkgs,
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...
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}:
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let
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cfg = config.aux.system;
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nixos-operations-script = pkgs.writeShellScriptBin "nixos-operations-script" (
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builtins.readFile ../../bin/nixos-operations-script.sh
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);
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in
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{
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options = {
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aux.system = {
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allowUnfree = lib.mkEnableOption "Allow unfree packages to install.";
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retentionPeriod = lib.mkOption {
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description = "How long to retain NixOS generations. Defaults to one month.";
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type = lib.types.str;
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default = "monthly";
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};
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nixos-operations-script.enable = lib.mkEnableOption "Installs the nos (nixos-operations-script) helper script.";
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};
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};
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config = lib.mkMerge [
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{
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nixpkgs.config.allowUnfree = cfg.allowUnfree;
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nix = {
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extraOptions = ''
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# Ensure we can still build when secondary caches are unavailable
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fallback = true
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'';
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settings = {
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# Enable Flakes
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experimental-features = [
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"nix-command"
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"flakes"
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];
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# Set up secondary binary caches for Lix and Hevana
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substituters = [
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"https://cache.lix.systems"
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"https://${config.secrets.services.binary-cache.url}"
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];
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trusted-public-keys = [
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"cache.lix.systems:aBnZUw8zA7H35Cz2RyKFVs3H4PlGTLawyY5KRbvJR8o="
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config.secrets.services.binary-cache.pubcert
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];
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# Authentication for Hevana's binary cache
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netrc-file =
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with config.secrets.services.binary-cache;
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pkgs.writeText "netrc" ''
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machine ${url} login ${auth.username} password ${auth.password}
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'';
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# Only allow these users to use Nix
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allowed-users = with config.users.users; [
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root.name
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(lib.mkIf config.aux.system.users.aires.enable aires.name)
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(lib.mkIf config.aux.system.users.gremlin.enable gremlin.name)
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];
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# Avoid signature verification messages when doing remote builds
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trusted-users = with config.users.users; [
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root.name
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(lib.mkIf config.aux.system.users.aires.enable aires.name)
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];
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};
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# Optimize the Nix store on each build
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settings.auto-optimise-store = true;
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# Enable garbage collection
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gc = {
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automatic = true;
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dates = "weekly";
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options = "--delete-older-than ${cfg.retentionPeriod}";
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persistent = true;
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randomizedDelaySec = "1hour";
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};
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# Configure NixOS to use the same software channel as Flakes
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registry.nixpkgs.flake = inputs.nixpkgs;
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nixPath = [ "nixpkgs=${inputs.nixpkgs}" ];
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};
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# Support for standard, dynamically-linked executables
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programs.nix-ld.enable = true;
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}
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(lib.mkIf cfg.nixos-operations-script.enable {
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# Enable and configure NOS
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aux.system.packages = [ nixos-operations-script ];
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environment.variables."FLAKE_DIR" = config.secrets.nixConfigFolder;
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})
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];
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}
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