Zachary Ware <zachary.w...@gmail.com> added the comment:

The issue here is not with buildbots, but with installation on POSIX platforms. 
 We do now have a couple of buildbots that install Python to a local location 
before running the tests, which is what flushes this out (see 
https://github.com/python/buildmaster-config/blob/master/master/custom/factories.py#L134-L147;
 they simply run `make install` before running the tests).

Adding these buildbots as pre-merge CI is not currently an option due to 
security implications (I don't want unreviewed code running on my home 
network).  I have plans to eventually allow certain builders to be run 
pre-merge iff the `awaiting merge` label is present on the PR, but I haven't 
had time to work on that yet.

It might be possible to adjust one of the Travis builds to install before 
running tests, but that leaves some other tests un-run, which just relocates 
the problem.

Removing reliance on an explicit listing of directories sounds nice, but does 
open up the possibility of installing more than expected if run from a dirty 
checkout.

What about adding a "new directories added to Makefile.pre.in" check to 
Tools/scripts/patchcheck.py?

----------
nosy: +zach.ware

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<https://bugs.python.org/issue37043>
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