nixos/tack: init

nixos/modules/module-list.nix

@@ -328,6 +328,7 @@
   ./programs/sysdig.nix
   ./programs/system-config-printer.nix
   ./programs/systemtap.nix
+  ./programs/tack.nix
   ./programs/tcpdump.nix
   ./programs/television.nix
   ./programs/throne.nix

nixos/modules/programs/tack.nix

@@ -0,0 +1,26 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.programs.tack;
+in
+{
+  options.programs.tack = {
+    enable = lib.mkEnableOption "tack, flake-like toml nix pins";
+
+    package = lib.mkPackageOption pkgs "tack" { };
+
+    nixConfTokens = lib.mkEnableOption "tack reading access tokens from nix.conf (significantly improves comparison speed)";
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [ cfg.package ];
+
+    environment.sessionVariables = lib.mkIf cfg.nixConfTokens {
+      TACK_NIX_CONF_TOKENS = "1";
+    };
+  };
+}