Māris Fogels 75d85af992 Bug 1590745 - Make the $PYTHON3 build var use a virtualenv r=mshal
Make the $PYTHON3 build var point to a full virtualenv bootstrapped with
the same libraries as the $PYTHON Python 2 build var. This allows us to
upgrade build tasks from $PYTHON to $PYTHON3.

This patch adds some debug logging and documentation to the Python
2 virtualenv so that it is easier to diagnose issues that may arise
from running two different Python interpreters in re-entrant
multiprocess routines.

Differential Revision: https://phabricator.services.mozilla.com/D50819

--HG--
extra : moz-landing-system : lando
2019-11-25 20:23:03 +00:00
..

This directory contains common Python code.

The basic rule is that if Python code is cross-module (that's "module" in the
Mozilla meaning - as in "module ownership") and is MPL-compatible, it should
go here.

What should not go here:

* Vendored python modules (use third_party/python instead)
* Python that is not MPL-compatible (see other-licenses/)
* Python that has good reason to remain close to its "owning" (Mozilla)
  module (e.g. it is only being consumed from there).

Historical information can be found at
https://bugzilla.mozilla.org/show_bug.cgi?id=775243
https://bugzilla.mozilla.org/show_bug.cgi?id=1346025