[Piglit] add compression support for file backends

[Ilia Mirkin]

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 :)

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