GNU bug report logs - #35621
Simplify comparing guix challenge results

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Vagrant Cascadian <vagrant <at> reproducible-builds.org>
Subject: bug#35621: closed (Re: [bug#38518] [PATCH 0/7] 'guix challenge'
 can diff archives directly)
Date: Thu, 12 Dec 2019 17:22:02 +0000

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Your bug report

#35621: Simplify comparing guix challenge results

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 35621 <at> debbugs.gnu.org.

-- 
35621: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=35621
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Ludovic Courtès <ludo <at> gnu.org>
To: 38518-done <at> debbugs.gnu.org, 35621-done <at> debbugs.gnu.org
Subject: Re: [bug#38518] [PATCH 0/7] 'guix challenge' can diff archives
 directly
Date: Thu, 12 Dec 2019 18:21:43 +0100

Hi,

Ludovic Courtès <ludo <at> gnu.org> skribis:

>   serialization: Add 'fold-archive'.
>   guix archive: Add '--list'.
>   challenge: Report the best narinfo URI.
>   serialization: Remove unused procedure.
>   progress: Add 'progress-report-port'.
>   challenge: Add "--diff".
>   challenge: Support "--diff=diffoscope".

Pushed!

Ludo’.

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From: Vagrant Cascadian <vagrant <at> reproducible-builds.org>
To: bug-guix <at> gnu.org
Subject: Simplify comparing guix challenge results
Date: Tue, 07 May 2019 11:02:05 -0700

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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
  /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.


live well,
  vagrant

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