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bug#35621: Simplify comparing guix challenge results

From: Vagrant Cascadian
Subject: bug#35621: Simplify comparing guix challenge results
Date: Tue, 07 May 2019 11:02:05 -0700

I'd like to see a simpler process for comparing challenge results
producing differences.

While the manual documents how to compare a failing challenge result

  $ wget -q -O - https://ci.guix.info/nar/…-git-2.5.0 \
     | guix archive -x /tmp/git
  $ diff -ur --no-dereference /gnu/store/…-git.2.5.0 /tmp/git

To check "git", you need to run "guix challenge git" and if the results
are inconclusive, manually cut-and-paste the correct URL(s) from the
challenge output and manually download it and unpack with guix archive,
and then run a comparison utility...

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

Downloads and unpacks the substitutes, and outputs the resulting

  $ 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.

live well,

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