[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2876: tox won't run on ubuntu xenial: python3

[Tahoe-LAFS]

#2876: tox won't run on ubuntu xenial: python3
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     Reporter:  warner     |      Owner:  daira
         Type:  defect     |     Status:  new
     Priority:  major      |  Milestone:  1.13.0
    Component:  packaging  |    Version:  1.12.1
   Resolution:             |   Keywords:
Launchpad Bug:             |
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Comment (by warner):

 Some other ideas that exarkun had in today's devchat:

 * add a `tox.py` script to the tahoe source tree, which would:
  * check that it's running under py2 (and explain the situation if not)
  * find the `tox` entrypoint (by asking `pkg_resources`, probably, or
 maybe just hard-coding the current `from tox import cmdline`)
  * invoke the entrypoint
 * or find some module that tox imports and add a `.py` file of the same
 name to tahoe's top-level directory
  * as in, "that'll teach them to not use absolute imports"
  * warner was.. not fond of this one

 If we did the `tox.py` thing, we could put a note in the "how to run
 tests" doc that said "on many systems you can just run `tox`, but if you
 see this complain about py3, then you'll need to run `python2 tox.py`
 instead". The error message that our setup.py raises (when run under py3)
 would be a good place for these instructions too.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2876#comment:14>
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