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Re: Proposal: auto-instantiate services with a default value

From: Ricardo Wurmus
Subject: Re: Proposal: auto-instantiate services with a default value
Date: Tue, 09 Jan 2018 14:42:21 +0100
User-agent: mu4e 1.0-alpha3; emacs 25.3.1

Ludovic Courtès <address@hidden> writes:

>> Also, that means that the instantiated mcron-service would automatically get 
>> a rottlog entry even though the mcron-service-types's default job list is 
>> empty, right ?
> Correct.
>> In that case it would be nice to be able to (optionally) override this 
>> mcron-service by a custom mcron-service in /etc/config.scm but retain the 
>> modified configuration with the implicit job in it.  Is that possible?
> Sure, the current way to do things (which is to explicitly list rottlog
> *and* mcron) would remain valid, and you could pass your own mcron
> config this way.

If a user already had an mcron service with a custom configuration,
it would still be extended as needed by adding the rottlog-service — or
am I mistaken?

I think auto-instantiation is great when it all shows up with “guix
system extension-graph” and users can thus figure out why certain
services were instantiated unexpectedly.


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