[PATCH 1 of 6] hghave: check the mercurial.modulepolicy for pure

[Yuya Nishihara]

On Wed, 9 Mar 2016 10:05:33 -0500, timeless wrote:
> (py)[timeless at gcc2-power8 tests]$ hg debuginstall
> checking encoding (UTF-8)...
> checking Python executable (/home/timeless/hg/py/bin/python)
> checking Python version (2.7.8)
> checking Python lib (/home/timeless/hg/py/lib64/python2.7)...
> checking installed modules (/home/timeless/hg/crew/mercurial)...
> checking templates (/home/timeless/hg/crew/mercurial/templates)...
> checking commit editor...
> checking username...
> no problems detected
> 
> There's no indication of pure.

I think it should report if we're running pure or not.

> It could be used to parse out installed
> modules directory, although I'd rather have it support -T so i could
> ask for it directly. And at that point, it would be better for
> debuginstall to report the modulepolicy.

Sounds promising.