From 6a2dfa7b58bfa89c3d0bf2445c699650c84e566d Mon Sep 17 00:00:00 2001
From: Quixos Development Agent 01f26965-84fa-4a79-8069-725682c13065
 <01f26965-84fa-4a79-8069-725682c13065@agents.gitea.internal.quixos.org>
Date: Thu, 5 Nov 2026 21:40:03 +0000
Subject: [PATCH] Use the declared original Nixpkgs input in compiler
 qualification (#931)

---
 source-qualification.nix | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/source-qualification.nix b/source-qualification.nix
index 3ce95ac..4af2934 100644
--- a/source-qualification.nix
+++ b/source-qualification.nix
@@ -1,8 +1,10 @@
 {
   pkgs,
   library,
+  nixpkgsSource,
   nixpkgsNarHash,
 }:
+assert builtins.isString nixpkgsSource;
 let
   comparisonIdentity = import ../tools/local-first/derivation-identity.nix;
   inspect = import ./source-qualification-metadata.nix;
@@ -34,7 +36,9 @@ let
       narHashContext = builtins.getContext nixpkgsNarHash;
       evaluatorVersion = builtins.nixVersion;
       pinnedNixVersion = pkgs.nix.version;
-      nixpkgs = pkgs.path;
+      # toJSON ingests path values. Keep the original flake input's outPath
+      # string, so importing it and interpolating pkgs.path does not copy twice.
+      nixpkgs = nixpkgsSource;
       system = pkgs.stdenv.hostPlatform.system;
       expected = comparisonIdentity library;
       expectedMetadata = inspect library;
@@ -42,7 +46,7 @@ let
       yarn = comparisonIdentity library.yarn-freestanding;
     }
   );
-  closure = pkgs.closureInfo { rootPaths = [ pkgs.path ]; };
+  closure = pkgs.closureInfo { rootPaths = [ nixpkgsSource ]; };
 in
 pkgs.runCommand "quixos-protocol-source-check"
   {