title: OError: [Errno 26] Text file busy: '/...myvirtualenv/bin/python'
body: <p>I try to recreate the virtualenv:</p>
  
  <pre><code>foo_bar_d@aptguettler:~$ virtualenv --system-site-packages . 
  </code></pre>
  
  <p>I get this exception:</p>
  
  <pre><code>foo_bar_d@aptguettler:~$ virtualenv --system-site-packages .
  New python executable in /home/foo_bar_d/bin/python
  Traceback (most recent call last):
    File "/usr/local/bin/virtualenv", line 11, in &lt;module&gt;
      sys.exit(main())
    File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 711, in main
      symlink=options.symlink)
    File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 924, in create_environment
      site_packages=site_packages, clear=clear, symlink=symlink))
    File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 1230, in install_python
      shutil.copyfile(executable, py_executable)
    File "/usr/lib/python2.7/shutil.py", line 83, in copyfile
      with open(dst, 'wb') as fdst:
  IOError: [Errno 26] Text file busy: '/home/foo_bar_d/bin/python'
  </code></pre>
  
  <p>Does someone know why this exception happens?</p>