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from __future__ import annotations
import importlib.util
import shutil
import sys
from pathlib import Path
def test_race_condition_simulation(tmp_path):
"""Test that simulates the race condition described in the issue.
This test creates a temporary directory with _virtualenv.py and _virtualenv.pth,
then simulates the scenario where:
- One process imports and uses the _virtualenv module (simulating marimo)
- Another process overwrites the _virtualenv.py file (simulating uv venv)
The test verifies that no NameError is raised for _DISTUTILS_PATCH.
"""
# Create the _virtualenv.py file
virtualenv_file = tmp_path / "_virtualenv.py"
source_file = Path(__file__).parents[2] / "src" / "virtualenv" / "create" / "via_global_ref" / "_virtualenv.py"
shutil.copy(source_file, virtualenv_file)
# Create the _virtualenv.pth file
pth_file = tmp_path / "_virtualenv.pth"
pth_file.write_text("import _virtualenv", encoding="utf-8")
# Simulate the race condition by repeatedly importing
errors = []
for _ in range(5):
# Try to import it
sys.path.insert(0, str(tmp_path))
try:
if "_virtualenv" in sys.modules:
del sys.modules["_virtualenv"]
import _virtualenv # noqa: F401, PLC0415
# Try to trigger find_spec
try:
importlib.util.find_spec("distutils.dist")
except NameError as e:
if "_DISTUTILS_PATCH" in str(e):
errors.append(str(e))
finally:
if str(tmp_path) in sys.path:
sys.path.remove(str(tmp_path))
assert not errors, f"Race condition detected: {errors}"
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