fix

modules/system/fingerprint.nix

@@ -0,0 +1,23 @@
+{
+  lib,
+  config,
+  ...
+}:
+let
+  cfg = config.my.system.fingerprint;
+in
+{
+  options.my.system.fingerprint = {
+    enable = lib.mkEnableOption "fingerprint authentication";
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.fprintd.enable = true;
+
+    security.pam.services = {
+      login.fprintAuth = true;
+      sudo.fprintAuth = true;
+      greetd.fprintAuth = true;
+    };
+  };
+}