New issue 341: Set environment variables based on ones in original environment
https://bitbucket.org/hpk42/tox/issues/341/set-environment-variables-based-on-ones-in
Aleks Bunin:
Up until 2.0 and full isolation, I had access to all variables I desired. Later
-- I need to pass variables to the tox environment.
I need to have ability to either rename variable when it passed to the test
environment.
For example, in my tests, I need to know where to get external executable,
which is different in every virtualenv from which I will run tox.
For example:
Let's say I'm in virtualenv and have executable `$VIRTUAL_ENV/v`. I have
`VPATH` variable which points me to it. In tox virtualenvs I'll need to setup
new `VPATH` which will point `{envdir}/v`.
Currently I have to set VPATH_OUTSIDE prior to starting tox and use
`pass=VPATH_OUTSIDE` in the `[testenv]`.
How do I pass original VPATH?
I'd want something like this:
```
[testenv]
setenv=
VPATH_OUTSIDE={passenv:VPATH}
```
I've looked through the doc and didn't find usable solution.
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