From 85857bfbc201ecdbdd7b7befa7560ad13acaab00 Mon Sep 17 00:00:00 2001
From: Tom Hunze <dev@thunze.de>
Date: Fri, 14 Nov 2025 10:25:04 +0100
Subject: [PATCH] python313Packages.langchain: fix build

Shell tool defaults to `/bin/bash`.
---
 pkgs/development/python-modules/langchain/default.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkgs/development/python-modules/langchain/default.nix b/pkgs/development/python-modules/langchain/default.nix
index 77e77ce0e5e7..47e9dbbf61d7 100644
--- a/pkgs/development/python-modules/langchain/default.nix
+++ b/pkgs/development/python-modules/langchain/default.nix
@@ -21,6 +21,9 @@
   sqlalchemy,
   tenacity,
 
+  # runtime
+  runtimeShell,
+
   # tests
   blockbuster,
   freezegun,
@@ -54,6 +57,11 @@ buildPythonPackage rec {
 
   sourceRoot = "${src.name}/libs/langchain_v1";
 
+  postPatch = ''
+    substituteInPlace langchain/agents/middleware/shell_tool.py \
+      --replace-fail '"/bin/bash"' '"${runtimeShell}"'
+  '';
+
   build-system = [ hatchling ];
 
   pythonRelaxDeps = [