Bug#893037: Add support for diffing docker-format containers

[Chris Lamb]

Juliana wrote:

> AFAIK, docker /images/ can be exported to tarballs. Not sure how human
> readable they are, but diffoscope can definitely work. (:> 

Indeed that would definitely work. However, the "REPL" for someone
doing this would inevitably involve someone scripting the export of
two images and then runnning diffoscope against them, instead of
simply knowing how to carve them out of, say, Docker to begin with.

This seems a little at odds with diffoscope's idea of making the
whole process of diffing two things much more usable.

Whilst my gut was initially against it, perhaps some kind of "magic"
paths (or URI scheme) would work here.

(Inspired by IRC conversation with Jon right now)


Best wishes,

-- 
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     : :'  :     Chris Lamb
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