[issue36046] support dropping privileges when running subprocesses

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

The 'Debian root' buildbot exposed a unittest issue to deal with:

https://buildbot.python.org/all/#/builders/27/builds/3702/steps/5/logs/stdio

======================================================================
ERROR: test_user (test.test_subprocess.POSIXProcessTestCase) (user=65534)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_subprocess.py", line 1761, in test_user
    output = subprocess.check_output(
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/subprocess.py", line 419, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/subprocess.py", line 497, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/subprocess.py", line 941, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/subprocess.py", line 1797, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
PermissionError: [Errno 13] Permission denied: '/root/buildarea/3.x.angelico-debian-amd64/build/python'
======================================================================
ERROR: test_user (test.test_subprocess.POSIXProcessTestCase) (user='nobody')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_subprocess.py", line 1761, in test_user
    output = subprocess.check_output(
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/subprocess.py", line 419, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/subprocess.py", line 497, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/subprocess.py", line 941, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/subprocess.py", line 1797, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
PermissionError: [Errno 13] Permission denied: '/root/buildarea/3.x.angelico-debian-amd64/build/python'

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36046>
_______________________________________