From b3ad661e9f6881d50719e5ea64417e50c68a7000 Mon Sep 17 00:00:00 2001
From: Silvan Mosberger <silvan.mosberger@tweag.io>
Date: Fri, 14 Jun 2024 20:42:16 +0200
Subject: [PATCH] nixos/lib/test-driver: Prevent unnecessary rebuilds

E.g. when only Nix files change
---
 nixos/lib/test-driver/default.nix | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/nixos/lib/test-driver/default.nix b/nixos/lib/test-driver/default.nix
index 7a88694b3167..26652db6016e 100644
--- a/nixos/lib/test-driver/default.nix
+++ b/nixos/lib/test-driver/default.nix
@@ -13,11 +13,20 @@
 , extraPythonPackages ? (_ : [])
 , nixosTests
 }:
-
+let
+  fs = lib.fileset;
+in
 python3Packages.buildPythonApplication {
   pname = "nixos-test-driver";
   version = "1.1";
-  src = ./.;
+  src = fs.toSource {
+    root = ./.;
+    fileset = fs.unions [
+      ./pyproject.toml
+      ./test_driver
+      ./extract-docstrings.py
+    ];
+  };
   pyproject = true;
 
   propagatedBuildInputs = [