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bug#35621: Simplify comparing guix challenge results

From: Ludovic Courtès
Subject: bug#35621: Simplify comparing guix challenge results
Date: Wed, 08 May 2019 15:04:31 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux)


Vagrant Cascadian <address@hidden> skribis:

> What about an argument to "guix challenge" that handles the downloading
> and unpacking to a temporary directory, and possibly another that also
> runs a comparison tool against the results. Maybe something like:
>   $ guix challenge --download-differences
>   /tmp/git-XXXXX/SUBSTITTE-X/...-git-2.5.0
>   /tmp/git-XXXXX/SUBSTITUTE-Y/...-git-2.5.0
>   /gnu/store/...-git-2.5.0
> Downloads and unpacks the substitutes, and outputs the resulting
> directories.
>   $ guix challenge --download-differences --compare-with="diffoscope ..."
> This would do the above, plus run diffoscope on the directories
> ... though I think diffoscope can only compare between two things at a
> time... so that might get difficult if many substitutes return results.

Sounds like a good idea.  Perhaps ‘--compare-with’ is actually enough
(it would also download things), dunno.


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