test_setup_requires failing on Python 3.4

[ghost]

Originally reported by: jaraco (Bitbucket: jaraco, GitHub: jaraco)

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In d597181958a3, I disabled a test for Python 3.3 and earlier. Today, thanks to Travis' new Python 3.4 support, I added Python 3.4 to the Python versions tested, but now the test is failing on Python 3.4 also:

ERROR: test_setup_requires (setuptools.tests.test_easy_install.TestUserInstallTest)
Regression test for Distribute issue #318
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Traceback (most recent call last):
File "/home/travis/build/jaraco/setuptools/setuptools/tests/test_easy_install.py", line 246, in test_setup_requires
  run_setup(test_setup_py, ['install'])
File "/home/travis/build/jaraco/setuptools/setuptools/sandbox.py", line 50, in run_setup
  lambda: execfile(
File "/home/travis/build/jaraco/setuptools/setuptools/sandbox.py", line 100, in run
  return func()
File "/home/travis/build/jaraco/setuptools/setuptools/sandbox.py", line 52, in <lambda>
  {'__file__':setup_script, '__name__':'__main__'}
File "/home/travis/build/jaraco/setuptools/setuptools/compat.py", line 78, in execfile
  exec(compile(source, fn, 'exec'), globs, locs)
File "setup.py", line 2, in <module>
  """Distutils setup file, used to install or test 'setuptools'"""
File "/opt/python/3.4.0/lib/python3.4/distutils/core.py", line 149, in setup
  dist.run_commands()
File "/opt/python/3.4.0/lib/python3.4/distutils/dist.py", line 955, in run_commands
  self.run_command(cmd)
File "/opt/python/3.4.0/lib/python3.4/distutils/dist.py", line 974, in run_command
  cmd_obj.run()
File "/home/travis/build/jaraco/setuptools/setuptools/command/install.py", line 61, in run
  if not self._called_from_setup(inspect.currentframe()):
File "/home/travis/build/jaraco/setuptools/setuptools/command/install.py", line 85, in _called_from_setup
  res = inspect.getouterframes(run_frame)[2]
File "/opt/python/3.4.0/lib/python3.4/inspect.py", line 1321, in getouterframes
  framelist.append((frame,) + getframeinfo(frame, context))
File "/opt/python/3.4.0/lib/python3.4/inspect.py", line 1296, in getframeinfo
  lines, lnum = findsource(frame)
File "/opt/python/3.4.0/lib/python3.4/inspect.py", line 709, in findsource
  if pat.match(lines[lnum]): break
IndexError: list index out of range

Curiously, this test doesn't fail on my Windows box against Python 3.4.0.

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/201

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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It appears to be a race condition that only appears if tests are run in a certain order. There is an upstream bug report, Python 1628987 marked as "won't fix". Based on that bug report, I believe the issue can be worked around by clearing the linecache in the setUp method for that class.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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I attempted several tests clearing the linecache in different places, including test setUp, test execution, and near where the install command invokes inspect.currentframe, but to no avail.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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There appears an additional, unlinked upstream bug report, Python 17735.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Another open upstream report: Python 1218234

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Also reported in Python 993580, marked as a dup.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Just suppress the spurious IndexError when it happens. Rely on the environments where the behavior doesn't fail until the upstream issue can be resolved. Fixes #201.

[jaraco]

The workaround is ad7c41a.