[Piglit] add compression support for file backends

[Dylan Baker]

On Wed, Jul 01, 2015 at 07:14:59PM -0400, Ilia Mirkin wrote:
> On Wed, Jul 1, 2015 at 7:04 PM, Dylan Baker <baker.dylan.c at gmail.com> wrote:
> > This adds a couple more unit tests, and a few fixes to the last version
> > of this series, with the notable addition being support xz compression
> >
> > Ilia: how would you feel about dropping shell support and just using
> > backports.lzma or not having xz support?
> 
> No one's going to have it... I do see it in portage though. But I also
> don't immensely see the problem with just supporting shelling out to
> the binary. But I also haven't read the code yet :)

Well, my assumption is that using pip backports.lzma would work on
windows and OSX (I don't know if it has an xz binary or not), while
shoveling things out to the shell only works on Unices (probably).

I don't care too much either way, really. It would just be a lot less
code.

Dylan
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