subprocess test cases fail with noexec-mounted /tmp

[calvin]

BPO	1444408
Files	python-subprocess-test.diff

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2006-07-10.20:30:20.000>
created_at = <Date 2006-03-06.20:48:29.000>
labels = ['library']
title = 'subprocess test cases fail with noexec-mounted /tmp'
updated_at = <Date 2006-07-10.20:30:20.000>
user = 'https://bugs.python.org/calvin'

bugs.python.org fields:

activity = <Date 2006-07-10.20:30:20.000>
actor = 'astrand'
assignee = 'astrand'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2006-03-06.20:48:29.000>
creator = 'calvin'
dependencies = []
files = ['1914']
hgrepos = []
issue_num = 1444408
keywords = []
message_count = 3.0
messages = ['27689', '27690', '27691']
nosy_count = 2.0
nosy_names = ['calvin', 'astrand']
pr_nums = []
priority = 'normal'
resolution = 'wont fix'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1444408'
versions = []

[calvin]

Hi,

on my Linux box two subprocess tests always fail (see
below for a log output).
The reason is those two tests try to execute files
created with tempfile.mkstemp(), which generates files
in /tmp. And my /tmp directory forbids to execute
files, it is mounted with the "noexec" option.

What I expected from the tests is to either find a
temporary directory where execution is allowed (eg. the
directory where sys.executable lies), or simply skip
those tests.

Test output:
[...]
======================================================================
ERROR: test_args_string
(test.test_subprocess.ProcessTestCase)
----------------------------------------------------------------------

Traceback (most recent call last):                    
            
  File
"/home/calvin/src/python-svn/Lib/test/test_subprocess.py",
line 490, in test_args_string
    p = subprocess.Popen(fname)
  File "/home/calvin/src/python-svn/Lib/subprocess.py",
line 580, in __init__
    errread, errwrite)
  File "/home/calvin/src/python-svn/Lib/subprocess.py",
line 1033, in _execute_child
    raise child_exception
OSError: [Errno 13] Permission denied

======================================================================
ERROR: test_call_string
(test.test_subprocess.ProcessTestCase)
----------------------------------------------------------------------

Traceback (most recent call last):
  File
"/home/calvin/src/python-svn/Lib/test/test_subprocess.py",
line 532, in test_call_string
    rc = subprocess.call(fname)
  File "/home/calvin/src/python-svn/Lib/subprocess.py",
line 431, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/home/calvin/src/python-svn/Lib/subprocess.py",
line 580, in __init__
    errread, errwrite)
  File "/home/calvin/src/python-svn/Lib/subprocess.py",
line 1033, in _execute_child
    raise child_exception
OSError: [Errno 13] Permission denied

[calvin]

Logged In: YES
user_id=9205

I attached a patch that creates temp files in the directory
of sys.executable. This directory is guaranteed to have
executable permissions, and should also have write
permissions (since sys.executable should have been generated
from a previous make run).

With the patch the test case runs ok.

[astrand]

Logged In: YES
user_id=344921

The directory with sys.executable is certainly not
guaranteed to be writable. For example, when I run the test
suite with the Python shipped with my Linux distribution,
os.path.dirname(sys.executable) is /usr/bin, which I cannot
write to. So, I don't like this patch.

Having /tmp mounted with "noexec" is just stupid, IMHO.
Which Linux distribution does this?

I do have some experience with working around "noexec"
mounts and my experience is that /tmp is "as good as it
gets". If someone can prove me wrong, then we can think of
patching test_subprocess, but until that, I'm going to close
this bug.