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From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: reproducible builds and debugging information
Date: Mon, 30 Mar 2015 21:42:57 +0200
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In-Reply-To: <87d23rbttt.fsf@netris.org> (Mark H. Weaver's message of "Sun, 29
	Mar 2015 13:24:14 -0400")
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To: Mark H Weaver <mhw@netris.org>
Cc: guix-devel@gnu.org

Mark H Weaver <mhw@netris.org> skribis:

> I think what Tom=C3=A1=C5=A1 suggested above does not conflict with the d=
esign of
> Nix and Guix.  As I understand it, he's suggesting that we have
> 'outputs' default to '("out" "debug") but then the debug outputs would
> be immediately discarded for most packages.  This would save both disk
> space and slave->hydra bandwidth.  Users could then get the debug
> outputs by building the package locally.

OK, I see.  The thing is that =E2=80=9Cimmediately discarded=E2=80=9D reall=
y means
=E2=80=9Cafter the build completed and they=E2=80=99ve been put in store.=
=E2=80=9D  So the build
machine would still need to be able to cope with the additional storage
requirements.

Also, currently I don=E2=80=99t see how we could avoid transferring the =E2=
=80=9Cdebug=E2=80=9D
output back to the master: when the daemon offloads a derivation build,
it really expects to be able to get all the outputs back.  We could hack
the daemon to special-case =E2=80=9Cdebug=E2=80=9D outputs but that doesn=
=E2=80=99t seem great.

Dunno, maybe I=E2=80=99m still too blinded by what=E2=80=99s possible now t=
o think about
what could be made possible.  :-)

Thanks,
Ludo=E2=80=99.