From 8ac12754cecbfffadeb97178a32584f9342df04b Mon Sep 17 00:00:00 2001
From: Philip Taron <philip.taron@gmail.com>
Date: Sat, 13 Sep 2025 05:47:22 -0700
Subject: [PATCH] pkgs/top-level/metrics.nix: turn off aliases in the
 evaluation

This mirrors `ci/eval` and also prevents many warnings from being logged.
---
 pkgs/top-level/metrics.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/top-level/metrics.nix b/pkgs/top-level/metrics.nix
index 26ef31c4a1d8..fe9437572e93 100644
--- a/pkgs/top-level/metrics.nix
+++ b/pkgs/top-level/metrics.nix
@@ -201,4 +201,11 @@ stdenvNoCC.mkDerivation {
     exit_status = "%x";
     command = "%C";
   };
+
+  # Don't allow aliases anywhere in Nixpkgs for the metrics.
+  env.NIXPKGS_CONFIG = builtins.toFile "nixpkgs-config.nix" ''
+    {
+      allowAliases = false;
+    }
+  '';
 }