From 648dbed1d6903931745babf6bf686b0631970538 Mon Sep 17 00:00:00 2001
From: Johannes Kirschbauer <hsjobeki@gmail.com>
Date: Fri, 30 May 2025 17:24:18 +0200
Subject: [PATCH] lib/types: add 'checkDefsForError' utility for checking defs
 with a given check

---
 lib/types.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/types.nix b/lib/types.nix
index 9ef1712ef1d1..88c5effd07f1 100644
--- a/lib/types.nix
+++ b/lib/types.nix
@@ -100,6 +100,13 @@ let
       }is accessed, use `${lib.optionalString (loc != null) "type."}nestedTypes.elemType` instead.
     '' payload.elemType;
 
+  checkDefsForError =
+    check: loc: defs:
+    let
+      invalidDefs = filter (def: !check def.value) defs;
+    in
+    if invalidDefs != [ ] then "Definition values: ${showDefs invalidDefs}" else null;
+
   outer_types = rec {
     isType = type: x: (x._type or "") == type;