From 7666eadc69167dc1a49e7f1cf4cf3f237037db19 Mon Sep 17 00:00:00 2001
From: Bruno Bigras <bigras.bruno@gmail.com>
Date: Sat, 27 Apr 2024 00:43:13 -0400
Subject: [PATCH] nixos/promtail: check-syntax in preStart

Co-authored-by: Pol Dellaiera <pol.dellaiera@protonmail.com>
---
 nixos/modules/services/logging/promtail.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/nixos/modules/services/logging/promtail.nix b/nixos/modules/services/logging/promtail.nix
index a34bc07b6ab2..9eccd34cef23 100644
--- a/nixos/modules/services/logging/promtail.nix
+++ b/nixos/modules/services/logging/promtail.nix
@@ -41,6 +41,10 @@ in {
       wantedBy = [ "multi-user.target" ];
       stopIfChanged = false;
 
+      preStart = ''
+        ${lib.getExe pkgs.promtail} -config.file=${prettyJSON cfg.configuration} -check-syntax
+      '';
+
       serviceConfig = {
         Restart = "on-failure";
         TimeoutStopSec = 10;