GNU bug report logs - #28484
Some steps and questions for Cuirass

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Jan Nieuwenhuizen <janneke <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#28484: closed (Some steps and questions for Cuirass)
Date: Mon, 18 Sep 2017 15:45:02 +0000

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and subject line Re: [bug#28484] Some steps and questions for Cuirass
has caused the debbugs.gnu.org bug report #28484,
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From: Jan Nieuwenhuizen <janneke <at> gnu.org>
To: guix-patches <at> gnu.org
Subject: Some steps and questions for Cuirass
Date: Sun, 17 Sep 2017 22:11:53 +0200

When Cuirass creates a new working directory from a guix.git clone, it tries
to build guix but fails like this

    /gnu/store/jqs80jq4j9z06p2vb9f7djv9k7jmc3d4-profile/bin/msgmerge: cannot create output file "de.po": Permission denied
    make[3]: *** [Makefile:255: de.po] Error 1
    make[3]: *** Waiting for unfinished jobs....

...although that may be a feature?

Patch 1/3 fixes this build problem...however now Cuirass rebuilds *all* of
guix (.go files) for each update of guix.git that it tracks.  When playing
with Cuirass to set it up, it's handy to only build `hello'.  Rebuilding all
of guix for each commit even if it fast-forwards, do we need/want that?

Patch 2/3 allows to test with other packages than "hello" or everything by
using a spec like

     ((#:name . "guix")
      (#:url . "git://git.savannah.gnu.org/guix.git")
      (#:load-path . ".")
      (#:file . "examples/gnu-system.scm")
      (#:proc . hydra-jobs)
      (#:arguments (subset . ("hello" "grep")))
      (#:branch . "master"))

Because this build recipe and thus this feature belongs in the repository
we're building, I also added a patch (the last one) for Guix itself that
implements this.

Patch 3/3 is the one I'm least happy with.  When building many more packages
than only `hello', Cuirass will not give any feedback until after everything
is built.  The Emacs interface under M-x guix-hydra-latests-builds is very
nice, but polling for that less so.

As the comment in the file already says

    ;; Register the results in the database.
    ;; XXX: The 'build-derivations' call is blocking so we end updating the
    ;; database potentially long after things have been built.

we probably want feedback (or guix-hydra-latests-builds availability) per
package...but any ideas how to do that?  We'd have to wrap/closure that into
building the derivations?

Greetings,
janneke

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From: Jan Nieuwenhuizen <janneke <at> gnu.org>
To: Mathieu Othacehe <m.othacehe <at> gmail.com>
Cc: 28484-done <at> debbugs.gnu.org
Subject: Re: [bug#28484] Some steps and questions for Cuirass
Date: Mon, 18 Sep 2017 17:44:08 +0200

Mathieu Othacehe writes:

> I don't think so, patch 1 & 2 LGTM.

Thanks!

> Now that Cuirass supports M-x guix-hydra-latests-builds, the next step
> is to detect build start/stop (maybe via guix build log parsing see:
> https://lists.gnu.org/archive/html/guix-devel/2017-07/msg00221.html).
>
> This way, for each new commit in guix, cuirass will only insert in
> database the derivation that were built. Plus, it will be possible to
> insert the build in db when it starts and update its status when it
> stops/fails.

Ah that makes sense.  Thanks for sharing this thread.

> Until this is developed, patch 3 LGTM too !

Thanks, pushed to guix-cuirass master as 87ad259dba7de38b6e3ab954cd7b2f655358d877

janneke

-- 
Jan Nieuwenhuizen <janneke <at> gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com

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