[issue40808] test_venv fails with HOME=/ on AMD64 FreeBSD Non-Debug 3.x

[STINNER Victor]

New submission from STINNER Victor <vstinner at python.org>:

test_venv fails on AMD64 FreeBSD Non-Debug 3.x since this build:
https://buildbot.python.org/all/#/builders/214/builds/808

This build has 3 changes. IMHO the regression comes from the commit feb0846c3a28b05b4cfbc6ab34c764957f3eff55: "Upgrade bundled versions of pip & setuptools (#16782)" (bpo-38488).

======================================================================
FAIL: test_with_pip (test.test_venv.EnsurePipTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-9e36.nondebug/build/Lib/test/test_venv.py", line 535, in test_with_pip
    self.do_test_with_pip(False)
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-9e36.nondebug/build/Lib/test/test_venv.py", line 518, in do_test_with_pip
    self.assertEqual(err.rstrip(), "")
AssertionError: "WARNING: The directory '/.cache/pip' or [206 chars]lag." != ''
- WARNING: The directory '/.cache/pip' or its parent directory is not owned or is not writable by the current user. The cache has been disabled. Check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
+ 



test.pythoninfo says:

os.environ[HOME]: /
pwd.getpwuid(1002): pwd.struct_passwd(pw_name='buildbot', pw_passwd='*', pw_uid=1002, pw_gid=1002, pw_gecos='FreeBSD BuildBot', pw_dir='/home/buildbot', pw_shell='/bin/sh')
os.getuid: 1002
os.login: koobs
os.getgid: 1002
os.getgrouplist: 1002
os.getgroups: 1002

----------
components: Tests
messages: 370209
nosy: vstinner
priority: normal
severity: normal
status: open
title: test_venv fails with HOME=/ on AMD64 FreeBSD Non-Debug 3.x
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40808>
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