From 52c27352ce96097741420918d5f19573b29d168f Mon Sep 17 00:00:00 2001
From: Andrew Marshall <andrew@johnandrewmarshall.com>
Date: Thu, 1 Jun 2023 13:48:58 -0400
Subject: [PATCH] applyPatches: skip creating additional drv when no patches

If there are no `patches` or `postPatch`, then this will just do work to
make something equivalent to `src`. Instead, just return `src` in that
case.
---
 pkgs/build-support/trivial-builders/default.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/build-support/trivial-builders/default.nix b/pkgs/build-support/trivial-builders/default.nix
index bdb79d9bf463c..07447b6461bc2 100644
--- a/pkgs/build-support/trivial-builders/default.nix
+++ b/pkgs/build-support/trivial-builders/default.nix
@@ -946,7 +946,10 @@ rec {
     , patches ? [ ]
     , postPatch ? ""
     , ...
-    }@args: stdenvNoCC.mkDerivation
+    }@args:
+    if patches == [ ] && postPatch == ""
+    then src # nothing to do, so use original src to avoid additional drv
+    else stdenvNoCC.mkDerivation
       {
         inherit name src patches postPatch;
         preferLocalBuild = true;