test_timestamp_overflow of test_importlib fails if PYTHONDONTWRITEBYTECODE is set

[inglesp]

BPO	26583
Nosy	@brettcannon, @ned-deily
Files	issue26583.patch

^{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 = 'https://github.com/ned-deily'
closed_at = <Date 2016-03-17.21:59:29.817>
created_at = <Date 2016-03-17.17:16:47.842>
labels = ['type-bug', 'tests']
title = 'test_timestamp_overflow of test_importlib fails if PYTHONDONTWRITEBYTECODE is set'
updated_at = <Date 2016-03-17.21:59:29.815>
user = 'https://bugs.python.org/inglesp'

bugs.python.org fields:

activity = <Date 2016-03-17.21:59:29.815>
actor = 'ned.deily'
assignee = 'ned.deily'
closed = True
closed_date = <Date 2016-03-17.21:59:29.817>
closer = 'ned.deily'
components = ['Tests']
creation = <Date 2016-03-17.17:16:47.842>
creator = 'inglesp'
dependencies = []
files = ['42189']
hgrepos = []
issue_num = 26583
keywords = ['patch']
message_count = 8.0
messages = ['261919', '261922', '261927', '261929', '261930', '261931', '261937', '261938']
nosy_count = 4.0
nosy_names = ['brett.cannon', 'ned.deily', 'python-dev', 'inglesp']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue26583'
versions = ['Python 3.5', 'Python 3.6']

[inglesp]

I get the following test failure against changeset 100576 on OSX 10.9.5:

$ ./python.exe -m test test_import
[1/1] test_import
test test_import failed -- Traceback (most recent call last):
  File "/Users/peteringlesby/src/cpython/Lib/test/test_import/__init__.py", line 301, in test_timestamp_overflow
    os.stat(compiled)
FileNotFoundError: [Errno 2] No such file or directory: '__pycache__/@test_68937_tmp.cpython-36.pyc'

1 test failed:
test_import

[ned-deily]

Sorry, I am unable to reproduce this on either 10.9.5 or current 10.11.3 OS X systems. Is there something unusual about the working directory you are running the tests from, like residing on an NFS or other networked file system? Any special ./configure options? Does the test always fail?

[inglesp]

I can reproduce it reliably.

I ran ./configure with --with-pydebug.

I'm not using NFS, and I'm not aware of anything else unusual about my filesystem.

The fact that a timestamp overflows in the failing test is a red herring -- the following also fails, with os.stat raising FileNotFoundError:

    def test_without_timestamp_overflow(self):
        sys.path.insert(0, os.curdir)
        try:
            source = TESTFN + ".py"
            compiled = importlib.util.cache_from_source(source)
            with open(source, 'w') as f:
                pass
            __import__(TESTFN)
            os.stat(compiled)
        finally:
            del sys.path[0]
            remove_files(TESTFN)

I've verified that TESTFN does get imported by writing 'print("hello")' to the source file.

[inglesp]

The problem is that I have PYTHONDONTWRITEBYTECODE set in my environment.

Should the setUp and tearDown methods ensure that PYTHONDONTWRITEBYTECODE is cleared and reset?

[ned-deily]

Ah, setting PYTHONDONTWRITEBYTECODE explains it. When running the tests via "make test", python is invoked with -E to avoid issues like that. But here's a patch that skips test_timestamp_overflow if bytecode files cannot be written (bpo-20796 documents a similar problem and workaround for test_import).

[brettcannon]

LGTM, Ned.

[python-dev]

New changeset 915f158633f4 by Ned Deily in branch '3.5':
Issue bpo-26583: Skip test_timestamp_overflow in test_import if bytecode
https://hg.python.org/cpython/rev/915f158633f4

New changeset e8cab14d8a47 by Ned Deily in branch 'default':
Issue bpo-26583: merge from 3.5
https://hg.python.org/cpython/rev/e8cab14d8a47