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Excerpts from Robert Collins's message of 2013-12-04 14:19:44 -0800:
> So - what about us capturing this information outside the image: we
> can create a uuid for the build, and write a file in the image with
> that uuid, and outside the image we can write:
>  - all variables (no security ramifications now as this file can be
> kept by whomever built the image)
>  - command line args
>  - version information for the toolchain etc.

I forgot to weigh in on this. It has all been said already. I like the
idea of this being a json file as well. +1.