Commits on Sep 1, 2019

1. Pass VIRTUAL_ENV environment variable to commands …

   Add the VIRTUAL_ENV variable to the process environment of commands
   executed in a nox session. The value of this variable contains the
   location of the virtualenv created by nox. More specifically, add the
   variable to the `env` attribute of `VirtualEnv` instances.
   
   Some commands rely on the presence of the VIRTUAL_ENV variable in their
   environment to detect that they are running in a virtualenv. In
   particular, poetry and pipenv will only install packages into the
   virtualenv if its location is passed to them via this variable. Without
   that variable, these commands will create their own virtualenv for the
   project, breaking session isolation.
   
   The VIRTUAL_ENV variable is usually set in the user's shell by the
   bin/activate scripts provided with a virtualenv. In the case of nox,
   commands run in a session are not executed within a shell. So the
   variable needs to be provided to the command by nox itself.

   

   cjolowicz committed Sep 1, 2019
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