py25 virtualenv downgrade fails if tox is installed w/ easy_install (as egg)

[pytoxbot]

• Bitbucket: https://bitbucket.org/hpk42/tox/issue/132
• Originally reported by: @jenisys
• Originally created at: 2013-10-27T19:13:23.838

VERSION-INFO: tox 1.6.1, setuptools>=0.9.8, python2.7

Run "tox -e py25" in a virtualenv where tox is installed with easy_install (as egg).
Python2.5 interpreter tries to access "virtualenv.py" that is bundled with tox in the egg, but cannot reach into the zipped egg (with the provided path).

Note the problem occurs before the actual downgrade.

xxx)shell> tox -e py25
GLOB sdist-make: /.../xxx/my_project/setup.py
py25 create: /.../xxx/my_project/.tox/py25
ERROR: invocation failed, logfile: /.../xxx/my_project/.tox/py25/log/py25-0.log
ERROR: actionid=py25
msg=getenv
cmdargs=['/usr/bin/python2.5', '/.../xxx/lib/python2.7/site-packages/tox-1.6.1-py2.7.egg/tox/vendor/virtualenv.py', '--setuptools', '--python', '/usr/bin/python2.5', 'py25']
...
/usr/bin/python2.5: can't open file '/.../xxx/lib/python2.7/site-packages/tox-1.6.1-py2.7.egg/tox/vendor/virtualenv.py': [Errno 20] Not a directory

ERROR: InvocationError: /usr/bin/python2.5 /.../xxx/lib/python2.7/site-packages/tox-1.6.1-py2.7.egg/tox/vendor/virtualenv.py --setuptools --python /usr/bin/python2.5 py25 (see /.../xxx/my_project/.tox/py25/log/py25-0.log)

[pytoxbot]

Original comment by @hpk42

fix issue132: removing zip_safe setting (so it defaults to false)
to allow installation of tox via easy_install/eggs. Thanks Jenisys.

→ <<cset 72ba41dbebee>>

[pytoxbot]

Original comment by @jenisys

Correct.

If you set "zip_safe=False" in tox's "setup.py" and install it with easy_install, you can run the example above without any problems. Probably the easiest solution.

NOTE: Removing the "zip_safe" attribute from the setup() call has the same effect.

[pytoxbot]

Original comment by @hpk42

does this mean tox is just missing a zip_safe=False setting?