From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jack Hill <jackhill@jackhill.us>
Subject: Re: Problem with building service from my channel
Date: Tue, 11 Jun 2019 09:38:07 -0400 (EDT)
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To: =?ISO-8859-15?Q?Ludovic_Court=E8s?= <ludo@gnu.org>
Cc: help-guix@gnu.org

On Tue, 11 Jun 2019, Ludovic Courtès wrote:

> Jack Hill <jackhill@jackhill.us> skribis:
>
>> ```
>> (repl-version 0 0)
>> (exception misc-error (value #f) (value "Unbound variable: ~s") (value (mcron-service-type)) (value #f))
>> ```
>
> The Guile exception possibly means that code in your channel refers to
> ‘mcron-service-type’, but that this variable is unbound.  It could be
> because one of your modules lacks #:use-module (gnu services mcron).

Ludo’,

That makes sense, except, I don't see where I have used 
mcron-service-type, but not used the (gnu services mcron) module, and the 
same channel code was working as of 
31775e400e05fb05fff0de4d3ffbf9549fe20994, so I think it that means it has 
to be something else.

Here's where I define a service that extends mcron-service-type

```
(define-module (guix-at-duke services endpoint-management)
   #:use-module (gnu packages certs)
   #:use-module (gnu services mcron)
   #:use-module (gnu services)
   #:use-module (guix gexp)
   #:use-module (guix records)
   #:use-module (guix-at-duke packages endpoint-management)
   #:export (planisphere-report-configuration
 	    planisphere-report-configuration?
 	    planisphere-report-service-type))

…[snip]…

(define planisphere-report-service-type
   (service-type
    (name 'planisphere-report)
    (extensions
     (list (service-extension mcron-service-type planisphere-report-jobs)))
    (default-value (planisphere-report-configuration))
    (description "Periodically run @command{planisphere-report} to update the OIT endpoint database.")))
```

Best,
Jack