From 31b5ab43edea0f22fd8fda6aa95ede0a3af4b425 Mon Sep 17 00:00:00 2001
From: James McCorrie <james.mccorrie@lowrisc.org>
Date: Thu, 12 Mar 2026 10:40:22 +0000
Subject: [PATCH] fix: set UV_PYTHON in .envrc for NixOS direnv users

On NixOS, uv resolves the Python interpreter via PATH even when
VIRTUAL_ENV is set, falling back to the immutable Nix store Python
which rejects writes. Setting UV_PYTHON explicitly in .envrc forces
uv to use the venv interpreter for all commands.

Signed-off-by: James McCorrie <james.mccorrie@lowrisc.org>
---
 .envrc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.envrc b/.envrc
index 1e385a24..642e425d 100644
--- a/.envrc
+++ b/.envrc
@@ -11,3 +11,7 @@ use flake
 
 # Activate the project venv
 . .venv/bin/activate
+
+# Tell UV to use the venv python, without this it will use system python on
+# NixOS. Which means `uv pip list` will not work.
+export UV_PYTHON=.venv/bin/python