Close #19694: venv now runs ensurepip in isolated mode
diff --git a/Lib/test/test_venv.py b/Lib/test/test_venv.py
index 6047f87..87d727e 100644
--- a/Lib/test/test_venv.py
+++ b/Lib/test/test_venv.py
@@ -12,7 +12,7 @@
import sys
import tempfile
from test.support import (captured_stdout, captured_stderr, run_unittest,
- can_symlink)
+ can_symlink, EnvironmentVarGuard)
import unittest
import venv
@@ -280,7 +280,12 @@
def test_with_pip(self):
shutil.rmtree(self.env_dir)
- self.run_with_capture(venv.create, self.env_dir, with_pip=True)
+ with EnvironmentVarGuard() as envvars:
+ # pip's cross-version compatibility may trigger deprecation
+ # warnings in current versions of Python. Ensure related
+ # environment settings don't cause venv to fail.
+ envvars["PYTHONWARNINGS"] = "e"
+ self.run_with_capture(venv.create, self.env_dir, with_pip=True)
envpy = os.path.join(os.path.realpath(self.env_dir), self.bindir, self.exe)
cmd = [envpy, '-m', 'pip', '--version']
p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
diff --git a/Lib/venv/__init__.py b/Lib/venv/__init__.py
index 2991c66..14158e9 100644
--- a/Lib/venv/__init__.py
+++ b/Lib/venv/__init__.py
@@ -234,8 +234,11 @@
def _setup_pip(self, context):
"""Installs or upgrades pip in a virtual environment"""
- cmd = [context.env_exe, '-m', 'ensurepip', '--upgrade',
- '--default-pip']
+ # We run ensurepip in isolated mode to avoid side effects from
+ # environment vars, the current directory and anything else
+ # intended for the global Python environment
+ cmd = [context.env_exe, '-Im', 'ensurepip', '--upgrade',
+ '--default-pip']
subprocess.check_output(cmd)
def setup_scripts(self, context):