¿Cómo hacer que virtualenv funcione después de actualizar a Lion?

Question

Acabo de actualizar de SnowLeapord a Lion y ahora no puedo crear virtualenvs. Tengo entendido que hay nuevas instalaciones de Python después de la actualización y no hay paquetes de sitio y han intentado instalar PIP y virtualenv nuevo, así como la actualización a Xcode4 pero siempre me sale este error:

~ > virtualenv --distribute env 
New python executable in env/bin/python 
Installing distribute........ 
Complete output from command /Users/jaderberg/env/bin/python -c "#!python 
\"\"\"Bootstra... main(sys.argv[1:]) 
" --always-copy -U distribute: 
Traceback (most recent call last): 
File "<string>", line 23, in <module> 
File "/Users/jaderberg/env/lib/python2.7/distutils/__init__.py", line 16, in <module> 
exec(open(os.path.join(distutils_path, '__init__.py')).read()) 
IOError: [Errno 2] No such file or directory: 'System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/__init__.py' 
---------------------------------------- 
...Installing distribute...done. 
Traceback (most recent call last): 
File "/usr/local/bin/virtualenv", line 9, in <module> 
load_entry_point('virtualenv==1.7.2', 'console_scripts', 'virtualenv')() 
File "/Library/Python/2.7/site-packages/virtualenv-1.7.2-py2.7.egg/virtualenv.py", line 942, in main 
never_download=options.never_download) 
File "/Library/Python/2.7/site-packages/virtualenv-1.7.2-py2.7.egg/virtualenv.py", line 1049, in create_environment 
search_dirs=search_dirs, never_download=never_download) 
File "/Library/Python/2.7/site-packages/virtualenv-1.7.2-py2.7.egg/virtualenv.py", line 603, in install_distribute 
search_dirs=search_dirs, never_download=never_download) 
File "/Library/Python/2.7/site-packages/virtualenv-1.7.2-py2.7.egg/virtualenv.py", line 570, in _install_req 
cwd=cwd) 
File "/Library/Python/2.7/site-packages/virtualenv-1.7.2-py2.7.egg/virtualenv.py", line 1020, in call_subprocess 
% (cmd_desc, proc.returncode)) 
OSError: Command /Users/jaderberg/env/bin/python -c "#!python 
\"\"\"Bootstra... main(sys.argv[1:]) 
" --always-copy -U distribute failed with error code 1 

Soy un poco de un UNIX/Python novato y simplemente no puede encontrar la manera de hacerlo funcionar. ¿Algunas ideas? Sin necesidad de utilizar la etiqueta --distribute consigo este error:

~ > virtualenv env 
New python executable in env/bin/python 
Installing setuptools............. 
    Complete output from command /Users/jaderberg/env/bin/python -c "#!python 
\"\"\"Bootstra...sys.argv[1:]) 






" /Library/Python/2.7/...ols-0.6c11-py2.7.egg: 
    Traceback (most recent call last): 
    File "", line 279, in 
    File "", line 207, in main 
    File "/Library/Python/2.7/site-packages/distribute-0.6.27-py2.7.egg/setuptools/__init__.py", line 2, in 
    from setuptools.extension import Extension, Library 
    File "/Library/Python/2.7/site-packages/distribute-0.6.27-py2.7.egg/setuptools/extension.py", line 2, in 
    import distutils.core 
    File "/Users/jaderberg/env/lib/python2.7/distutils/__init__.py", line 16, in 
    exec(open(os.path.join(distutils_path, '__init__.py')).read()) 
IOError: [Errno 2] No such file or directory: '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/__init__.py' 
---------------------------------------- 
...Installing setuptools...done. 
Traceback (most recent call last): 
    File "/usr/local/bin/virtualenv", line 9, in 
    load_entry_point('virtualenv==1.7.2', 'console_scripts', 'virtualenv')() 
    File "/Library/Python/2.7/site-packages/virtualenv-1.7.2-py2.7.egg/virtualenv.py", line 942, in main 
    never_download=options.never_download) 
    File "/Library/Python/2.7/site-packages/virtualenv-1.7.2-py2.7.egg/virtualenv.py", line 1052, in create_environment 
    search_dirs=search_dirs, never_download=never_download) 
    File "/Library/Python/2.7/site-packages/virtualenv-1.7.2-py2.7.egg/virtualenv.py", line 598, in install_setuptools 
    search_dirs=search_dirs, never_download=never_download) 
    File "/Library/Python/2.7/site-packages/virtualenv-1.7.2-py2.7.egg/virtualenv.py", line 570, in _install_req 
    cwd=cwd) 
    File "/Library/Python/2.7/site-packages/virtualenv-1.7.2-py2.7.egg/virtualenv.py", line 1020, in call_subprocess 
    % (cmd_desc, proc.returncode)) 
OSError: Command /Users/jaderberg/env/bin/python -c "#!python 
\"\"\"Bootstra...sys.argv[1:]) 


" /Library/Python/2.7/...ols-0.6c11-py2.7.egg failed with error code 1 

Answer 1

Resulta que aunque he actualizado a la versión de Xcode 4, no se instala automáticamente las herramientas de línea de comandos. Seguí esto http://blog.cingusoft.org/mac-osx-lion-virtualenv-and-could-not-call-in.

Básicamente, instale Xcode, vaya a Preferencias y luego Descargas e instale "Herramientas de línea de comandos". Ahora funciona.

Herramientas de la línea de comandos también están disponibles directamente desde https://developer.apple.com/downloads/index.action#

Answer 2

También tuve que actualizar mis setuptools.

pip install setuptools --upgrade

Answer 3

cd /usr/lib/python2.7 
sudo ln -s plat-x86_64-linux-gnu/_sysconfigdata_nd.py .