From bb08d48579f6a6815836c90e28d6c00301213883 Mon Sep 17 00:00:00 2001
From: Anthony Roussel <anthony@roussel.dev>
Date: Sun, 15 Feb 2026 22:35:29 +0100
Subject: [PATCH] nixos/autosuspend: assert at least one check is configured

Otherwise autosuspend will fail at startup.
---
 nixos/modules/services/misc/autosuspend.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/nixos/modules/services/misc/autosuspend.nix b/nixos/modules/services/misc/autosuspend.nix
index c5e61ad57bbf..9bbc9b2e7af8 100644
--- a/nixos/modules/services/misc/autosuspend.nix
+++ b/nixos/modules/services/misc/autosuspend.nix
@@ -226,6 +226,13 @@ in
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      {
+        assertion = cfg.checks != { };
+        message = "`services.autosuspend.checks` must contain at least one activity check.";
+      }
+    ];
+
     systemd.services.autosuspend = {
       description = "A daemon to suspend your server in case of inactivity";
       documentation = [ "https://autosuspend.readthedocs.io/en/latest/systemd_integration.html" ];