From 94b7b469aa6ae3f3b7adb08d325eaa6eb434735e Mon Sep 17 00:00:00 2001
From: nicoo <nicoo@mur.at>
Date: Sat, 25 May 2024 19:05:56 +0000
Subject: [PATCH] nixos/promtail: Replace custom `jq`-based `runCommand` with
 `pkgs.formats`

---
 nixos/modules/services/logging/promtail.nix | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/nixos/modules/services/logging/promtail.nix b/nixos/modules/services/logging/promtail.nix
index d6038055c05c..7dabe13de41d 100644
--- a/nixos/modules/services/logging/promtail.nix
+++ b/nixos/modules/services/logging/promtail.nix
@@ -2,9 +2,11 @@
 let
   cfg = config.services.promtail;
 
-  prettyJSON = conf: pkgs.runCommandLocal "promtail-config.json" {} ''
-    echo '${builtins.toJSON conf}' | ${pkgs.buildPackages.jq}/bin/jq 'del(._module)' > $out
-  '';
+  format = pkgs.formats.json {};
+  prettyJSON = conf: with lib; pipe conf [
+    (flip removeAttrs [ "_module" ])
+    (format.generate "promtail-config.json")
+  ];
 
   allowSystemdJournal = cfg.configuration ? scrape_configs && lib.any (v: v ? journal) cfg.configuration.scrape_configs;
 
@@ -20,7 +22,7 @@ in {
     enable = mkEnableOption "the Promtail ingresser";
 
     configuration = mkOption {
-      type = (pkgs.formats.json {}).type;
+      type = format.type;
       description = ''
         Specify the configuration for Promtail in Nix.
         This option will be ignored if `services.promtail.configFile` is defined.