[Piglit] add compression support for file backends

[Dylan Baker]

On Wed, Jul 01, 2015 at 07:27:18PM -0400, Ilia Mirkin wrote:
> On Wed, Jul 1, 2015 at 7:25 PM, Dylan Baker <baker.dylan.c at gmail.com> wrote:
> > 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).
> 
> AKA 99.9% of piglit's userbase :)

Probably more like 90%, but point taken.

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