From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dave Love <fx@gnu.org>
Subject: Re: fixing --check saying outputs not valid
Date: Wed, 13 Sep 2017 14:27:17 +0100
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In-Reply-To: <87y3pl8mai.fsf@gnu.org> ("Ludovic
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To: Ludovic =?iso-8859-1?Q?Court=E8s?= <ludo@gnu.org>
Cc: help-guix@gnu.org

Ludovic Court=C3=A8s <ludo@gnu.org> writes:

> Dave Love <fx@gnu.org> skribis:
>>> Then you can run =E2=80=9Cguix build hwloc --check -L --no-grafts=E2=80=
=9D, which will
>>> build hwloc locally and raise an error if hwloc:{out,lib} are not
>>> bit-identical to what you had in store.
>>
>> [Should that be documented as the procedure to use?]
>
> I think this is documented, but if you think it=E2=80=99s not or not in t=
he
> right place, please tell!

I don't remember where I found out about using --check when packaging.
The manual doesn't mention --no-grafts in connexion with --check as far
as I can see.  I'd add something like

  You probably want to use --check with the --no-grafts option when
  checking a package you are developing, so that it gets rebuilt.

>> The trouble is that I don't get a second build with --check:
>>
>>   $ ./pre-inst-env guix build hwloc --check -L --no-grafts
>                                               ^^^^
> =E2=80=9C--no-grafts=E2=80=9D is taken as an argument to =E2=80=98-L=E2=
=80=99, and thus you only rebuilt
> the grafting derivation:

Thanks.  I shouldn't just do what I'm told :-/.  However, I don't
understand why -L is needed, or what the path should be.