From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Subject: bug#18747: [PATCH] Distinguish between
	=?UTF-8?Q?=E2=80=9Coffloadability=E2=80=9D?= and
	=?UTF-8?Q?=E2=80=9Csubstitutability=E2=80=9D?=
Date: Wed, 01 Jul 2015 17:27:02 +0200
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>, 18747@debbugs.gnu.org
Cc: nix-dev@lists.science.uu.nl

Hi,

On 01/07/15 17:21, Ludovic Courtès wrote:

> Nix commit 55586527 (June 2013) changed the semantics of
> ‘preferLocalBuild’ from “avoid offloading this derivation” to “avoid
> offloading *or substituting* this derivation” (see
> <http://bugs.gnu.org/18747>.)
> 
> This patch introduces a new special key, ‘substitution’, to specify
> whether a derivation should be substituted.  ‘preferLocalBuild’ is kept,
> but its initial semantics is restored.

Have you seen
https://github.com/NixOS/nix/commit/b64988bb3585478676585a0f0aecbcf4e11d4432,
which essentially does the same thing?

-- 
Eelco Dolstra | LogicBlox, Inc. | http://nixos.org/~eelco/