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bug#20217: Allow users to use the daemon's default settings

From: Ludovic Courtès
Subject: bug#20217: Allow users to use the daemon's default settings
Date: Wed, 28 Oct 2015 15:36:35 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)

address@hidden (Ludovic Courtès) skribis:

> Mark H Weaver <address@hidden> skribis:
>> Ludovic Courtès <address@hidden> writes:
>>> commit 4d58122071bbd7bb56c9658a9bbe7621bf3e423d
>>> Author: Ludovic Courtès <address@hidden>
>>> Date:   Sun Mar 22 23:43:25 2015 +0100
>>>     store: Default to a non-empty list of substituters.
>>>     Fixes <http://bugs.gnu.org/20163>.
>>>     Reported by Mark H Weaver <address@hidden>.
>>>     * guix/store.scm (%default-substitute-urls): New variable.
>>>       (set-build-options): Change default value of #:substitute-urls to
> [...]
>> Does this mean that even if I've configured my daemon to use a different
>> set of substitute-urls, when I run 'guix' as root those settings will be
>> overridden?
> Yes.

This particular issue of substitute URLs is fixed in fb4bf72.

The more general problem remains though: for all the other options, like
max-build-jobs, timeout, etc., the client settings take precedence over
the daemon settings because the ‘set-build-options’ RPC doesn’t provide
a way to say “use default value.”

The fix for that will be either: (1) a ‘set-build-options2’ RPC that has
a way to leave some settings unchanged, or (2) a ‘get-build-options’ RPC.

Option (1) is simpler and more efficient, but option (2) could be


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