mach fails to activate virtualenv if cwd needs quoting

[zbynekwinkler]

If the quoting added in the fix in #8394 (4ff8d3a) kicks in, it causes virtualenv to fail to activate.

For the common case it is no op:

>>> from pipes import quote
>>> print quote('common/case')
common/case

When the path actually needs quoting, this is what happens:

>>> print quote('test spaces')
'test spaces'
>>> print quote('windows\\path')
'windows\\path'

Please note the embedded quotes.

Virtualenv in activate_this.py uses __file__ to build the path that should be added to PATH:

>>> print os.getcwd()
C:\software\git
>>> print os.path.abspath(quote('windows\\path'))
C:\software\git\'windows\path'
>>>

As you can see the constructed path is not valid. Adding it at the beginning of PATH has no effect. This issue affects any case when the call to quote needs to kick in (not only on Windows as previously reported).

[zbynekwinkler]

@jdm I have updated the title and description of this issue to cover also the case with space in path. Feel free to further tweak it and/or relabel.