add nixos and darwin-nix modules

home-module.nix

@@ -0,0 +1,62 @@
+{
+  config,
+  lib,
+  ...
+}:
+let
+  cfg = config.services.nix-cache-login;
+in
+{
+  options.services.nix-cache-login = {
+    enable = lib.mkEnableOption "nix-cache-login automatic token refresh";
+    package = lib.mkOption {
+      type = lib.types.package;
+      description = "The nix-cache-login package to use.";
+    };
+    refreshInterval = lib.mkOption {
+      type = lib.types.ints.positive;
+      default = 900;
+      description = ''
+        How often to attempt token refresh, in seconds.
+        If no valid session exists, the service logs an error and retries on
+        the next interval. Run {command}`nix-cache-login` to log in.
+      '';
+      example = 1800;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.packages = [ cfg.package ];
+    systemd.user.services.nix-cache-login = {
+      Unit.Description = "Nix cache login - refresh access token";
+      Service = {
+        Type = "oneshot";
+        ExecStart = "${cfg.package}/bin/nix-cache-login refresh";
+      };
+    };
+
+    systemd.user.timers.nix-cache-login = {
+      Unit.Description = "Nix cache login - periodic token refresh";
+      Timer = {
+        OnBootSec = "2min";
+        OnUnitActiveSec = "${toString cfg.refreshInterval}s";
+      };
+      Install.WantedBy = [ "timers.target" ];
+    };
+
+    launchd.agents.nix-cache-login = {
+      enable = true;
+      config = {
+        ProgramArguments = [
+          "${cfg.package}/bin/nix-cache-login"
+          "refresh"
+        ];
+        StartInterval = cfg.refreshInterval;
+        RunAtLoad = true;
+        ProcessType = "Background";
+        StandardOutPath = "${config.home.homeDirectory}/Library/Logs/nix-cache-login.log";
+        StandardErrorPath = "${config.home.homeDirectory}/Library/Logs/nix-cache-login.log";
+      };
+    };
+  };
+}