Setuptools installs as older version

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

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In setuptools 0.9.1, the code was changed to reduce the number of places where the version number was recorded. To accomplish this, it imported setuptools and read setuptools.__version__. It turns out that in the upgrade scenario, this causes the new version of setuptools to be installed but with the older version number. Observe:

jenkins@myhost:~/jobs/myapp/workspace/services$ virtualenv --setuptools myservice
New python executable in myservice/bin/python2.7
Also creating executable in myservice/bin/python
Installing setuptools............done.
Installing pip...............done.
jenkins@myhost:~/jobs/myapp/workspace/services$ myservice/bin/easy_install setuptools==0.9.3
Searching for setuptools==0.9.3
Reading http://pypi.python.org/simple/setuptools/
Reading http://peak.telecommunity.com/snapshots/
Reading https://pypi.python.org/pypi/setuptools
Best match: setuptools 0.9.3
Downloading https://pypi.python.org/packages/source/s/setuptools/setuptools-0.9.3.tar.gz#md5=142b8891558ae09fa3b3070e88dca004
Processing setuptools-0.9.3.tar.gz
Running setuptools-0.9.3/setup.py -q bdist_egg --dist-dir /tmp/easy_install-SbxnMA/setuptools-0.9.3/egg-dist-tmp-QR2x8j
/usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'src_root'
  warnings.warn(msg)
setuptools 0.6c11 is already the active version in easy-install.pth
Installing easy_install script to /var/lib/jenkins/jobs/myapp/workspace/services/myservice/bin
Installing easy_install-2.7 script to /var/lib/jenkins/jobs/myapp/workspace/services/myservice/bin

Installed /var/lib/jenkins/jobs/myapp/workspace/services/myservice/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg
Processing dependencies for setuptools==0.6c11
Finished processing dependencies for setuptools==0.6c11

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/43

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

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Load version from the file rather than by importing the module (which is subject to variance based on sys.path). Fixes #43.