modules.systemd_assert_service: ensures a service exists, disabled

shared/modules/assert_systemd_service.nix

@@ -0,0 +1,17 @@
+{ config, lib, ... }:
+
+{
+  options.mine.assertSystemdService = lib.mkOption {
+    type = lib.types.listOf lib.types.str;
+    default = [];
+  };
+
+  config = {
+    assertions = lib.forEach config.mine.assertSystemdService (v: let
+        c = config.systemd.services."${v}";
+    in {
+      assertion = c.script != "" || (c.serviceConfig ? ExecStart);
+      message = "Systemd service ${v} does not exists";
+    });
+  };
+}

shared/modules/default.nix

@@ -1,6 +1,7 @@
 {
   imports = [
     ./shared.nix
+    # ./assert_systemd_service.nix
 
     ./zrepl.nix
     ./disko.nix