From 09bbd80fadd064601e6c8aa7c375bc5eb104e964 Mon Sep 17 00:00:00 2001
From: Emily <vcs@emily.moe>
Date: Fri, 12 Sep 2025 19:00:59 +0100
Subject: [PATCH] watchman: patch CMake reproducibility issue
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This is the first thing outside of CMake itself I’ve seen that
would have derived some value from `fixCmakeFiles`.
---
 pkgs/by-name/wa/watchman/package.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/by-name/wa/watchman/package.nix b/pkgs/by-name/wa/watchman/package.nix
index e38b556d47a0..960f02a70355 100644
--- a/pkgs/by-name/wa/watchman/package.nix
+++ b/pkgs/by-name/wa/watchman/package.nix
@@ -96,6 +96,12 @@ stdenv.mkDerivation (finalAttrs: {
 
     cp ${./Cargo.lock} ${finalAttrs.cargoRoot}/Cargo.lock
 
+    # The build system looks for `/usr/bin/python3`. It falls back
+    # gracefully if it’s not found, but let’s dodge the potential
+    # reproducibility risk for unsandboxed Darwin.
+    substituteInPlace CMakeLists.txt \
+      --replace-fail /usr/bin /var/empty
+
     # Facebook Thrift requires C++20 now but Watchman hasn’t been
     # updated yet… (Aren’t these things meant to be integrated together
     # in a monorepo?)