GNU bug report logs - #28310
Grafting prevents build plan from being displayed upfront

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Andreas Enge <andreas <at> enge.fr>
Subject: bug#28310: closed (Re: bug#28310: guix build -n misses package
 builds)
Date: Sun, 22 Mar 2020 11:49:02 +0000

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Your bug report

#28310: Grafting prevents build plan from being displayed upfront

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 28310 <at> debbugs.gnu.org.

-- 
28310: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=28310
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Andreas Enge <andreas <at> enge.fr>
Cc: 28310-done <at> debbugs.gnu.org
Subject: Re: bug#28310: guix build -n misses package builds
Date: Sun, 22 Mar 2020 12:48:39 +0100

Hello,

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

> Andreas Enge <andreas <at> enge.fr> skribis:
>
>> I am right now in the process of updating pari-gp to version 2.9.3.
>> After building it on a git check-out of three days ago, which went smoothly,
>> I rebased my patch on today's master and was pleased to see that no rebuild
>> was needed:
>>
>> $ ./pre-inst-env guix build pari-gp -n
>> outputs nothing.
>>
>> However, once the -n dropped, the gd package gets built.
>> And then it is starting ruby, which has no connection to pari-gp:
>> Downloading https://mirror.hydra.gnu.org/guix/nar/229n3pzp5bdmbdvwslg0dxliysas92k5-ruby-2.4.1.tar.xz...
>>    ruby-2.4.1.tar.xz  9.5MiB                                                                                                       22KiB/s 00:06 [                    ]   1.3%^
>
> “-n” now implies “--no-grafts” (commit
> fd59105c49965db956fac73c68d8b00d068f5d5c).  This was motivated by the
> need to have -n really perform a dry run.
>
> The downside is that with -n we now see only half of the build plan, and
> when we remove -n, we start with the other half of the build plan,
> grafting.

This is now fixed with this patch series:

  https://issues.guix.gnu.org/issue/40130

It does mean that “The following derivations will be built” can be
printed several times during a build.  That’s a natural consequence of
having dynamic dependencies (grafts) in the graph: we can’t always
statically determine what’s going to be built.

> The “build continuation” idea of ‘wip-gexp-grafts’, discussed in
> <https://bugs.gnu.org/22990>, could in theory help with that.

‘with-build-handler’ also has to do with continuations, only in a
different way.  :-)

Ludo’.

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From: Andreas Enge <andreas <at> enge.fr>
To: bug-guix <at> gnu.org
Subject: guix build -n misses package builds
Date: Thu, 31 Aug 2017 21:03:34 +0200

Hello,

I am right now in the process of updating pari-gp to version 2.9.3.
After building it on a git check-out of three days ago, which went smoothly,
I rebased my patch on today's master and was pleased to see that no rebuild
was needed:

$ ./pre-inst-env guix build pari-gp -n
outputs nothing.

However, once the -n dropped, the gd package gets built.
And then it is starting ruby, which has no connection to pari-gp:
Downloading https://mirror.hydra.gnu.org/guix/nar/229n3pzp5bdmbdvwslg0dxliysas92k5-ruby-2.4.1.tar.xz...
   ruby-2.4.1.tar.xz  9.5MiB                                                                                                       22KiB/s 00:06 [                    ]   1.3%^

Andreas

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