[Piglit] Versioned JSON results v3

[Dylan Baker]

This series is available on github:
https://github.com/dcbaker/piglit.git versioned-results-v6

On Friday, June 20, 2014 12:50:26 PM Dylan Baker wrote:
> This is the third iteration of introducing versions to our results
> files. This purpose of doing this is to ensure that the results look a
> certain way, removing the need to to handle variations in the files at
> run time (and allowing for improvements to be made without concern for
> mixing multiple versions of results)
> 
> The way this series aproachs the problem is to read the old results in,
> do transformations on the resulting data structure, then write that data
> back out. When it does this it renames the old file, so that if
> something goes wrong it's not lost. It also works through a series of
> transformations, so version 1->5 would be handled by updating 1 -> 2, 2
> -> 3, etc. this aproach makes testing easy, and since testing is easy it
> makes it easy to ensure that everything works as expected. What this
> isn't is particularly efficient, this is because the design of the
> feature is that it is a one time cost to update results, done
> transparently at load time.
> 
> Patches 1-5 Lay groundwork by changing the way environment variables are
> handled by the framework. Essentially before these patches we set
> environment variables gobally and then let them trickle down. After the
> patches the environment variables are passed to subprocess.Popen
> directly.
> 
> These patches are new in v3
> 
> Patches 6-11 lay additional groundwork by refactoring and cleaning
> existing code
> 
> Patches 12-13 do the actual lifting of the series. Patch 12 adds results
> versioning, and 13 removes workarounds from summary for dealing with
> old versions.
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