New issue 215: retry installation steps
https://bitbucket.org/hpk42/tox/issue/215/retry-installation-steps

glyph:

On various test infrastructures (Travis-CI in particular) PyPI is frequently 
unavailable.

When this is so, I would like tox to re-try the `pip install` step but not the 
actual testing step. If actual tests fail, I would like to see a failure. If 
installation fails, I would like to just re-attempt installation… for 
intermittent failures, I'd like to do this basically forever, for "hard" 
failures where packages appear to have been removed from the index, for 
example, reporting a failure might be fine.

There doesn't seem to be a way to do this, and I can't work around it because 
there also doesn't seem to be a way to tell tox to *just* create its virtual 
environments. Perhaps I just haven't found the relevant documentation yet 
though.


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