From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#18747: Fixed-output derivations are not substituted
Date: Thu, 16 Oct 2014 17:46:18 +0200
Message-ID: <87lhog3tmd.fsf@gnu.org>
References: <87h9z4594k.fsf@gnu.org> <874mv458bo.fsf@gnu.org>
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ludo@gnu.org (Ludovic Court=C3=A8s) skribis:

> Initially #:local-build? (aka. =E2=80=98preferLocalBuild=E2=80=99) meant =
=E2=80=9Cavoid
> offloading this derivation=E2=80=9D, but Nix commit 55586527 (June 2013) =
changed
> it to =E2=80=9Cavoid offloading *or substituting* this derivation=E2=80=
=9D, which I
> somehow overlooked for all this time.

The relevant code is in libstore/build.cc:

--8<---------------cut here---------------start------------->8---
    /* We are first going to try to create the invalid output paths
       through substitutes.  If that doesn't work, we'll build
       them. */
    if (settings.useSubstitutes && !willBuildLocally(drv))
        foreach (PathSet::iterator, i, invalidOutputs)
            addWaitee(worker.makeSubstitutionGoal(*i, buildMode =3D=3D bmRe=
pair));
--8<---------------cut here---------------end--------------->8---

Ludo=E2=80=99.