Mark H Weaver <mhw@netris.org> writes:

> Hi Christopher,
>
> mail@cbaines.net (Christopher Baines) writes:
>
>> cbaines pushed a commit to branch master
>> in repository guix.
>>
>> commit 258a6d944ed891fa92fa87a16731e5dfe0bac477
>> Author: Christopher Baines <mail@cbaines.net>
>> Date:   Fri Jul 13 20:39:46 2018 +0100
>>
>>     services: Add Gitolite.
>>
>>     * gnu/services/version-control.scm (<gitolite-configuration>,
>>     <gitolite-rc-file>): New record types.
>>     (gitolite-accounts, gitolite-activation): New procedures.
>>     (gitolite-service-type): New variables.
>>     * gnu/tests/version-control.scm (%gitolite-test-admin-keypair, %gitolite-os,
>>     %test-gitolite): New variables.
>>     (run-gitolite-test): New procedure.
>>     * doc/guix.texi (Version Control): Document the gitolite service.
>
> This commit has a flaw which broke evaluations on Hydra, so I reverted
> it for now.
>
>> +(define-gexp-compiler (gitolite-rc-file-compiler
>> +                       (file <gitolite-rc-file>) system target)
>> +  (match file
>> +    (($ <gitolite-rc-file> umask git-config-keys roles enable)
>> +     (apply text-file* "gitolite.rc"
>> +      `("%RC = (\n"
>> +        "    UMASK => " ,(format #f "~4,'0o" umask) ",\n"
>
> The problem is here, in the call to 'format'.  Guile has two variants of
> the 'format' procedure: a very simple one which is always available
> (also known as 'simple-format'), and a much more complex and featureful
> variant in (ice-9 format).  In the code above, you are assuming that
> (ice-9 format) has been loaded, but you have not arranged for that to
> happen.  During the Hydra evaluation, this led to the following error:
>
> --8<---------------cut here---------------start------------->8---
>            0 (simple-format #f "~4,'0o" 63)
>
> ERROR: In procedure simple-format:
> In procedure simple-format: FORMAT: Unsupported format option ~4 - use (ice-9 format) instead
> --8<---------------cut here---------------end--------------->8---

Thanks for looking at this Mark, do you know where I can find out what
Hydra is doing when it encounters this error? I tried looking around the
web interface, but the latest evaluation I could find was from 2017
apparently.

> I guess that the fix will involve 'with-imported-modules'.
> Could you take a look?

Sure. The confusing thing to me here is that this code works when using
the service, including the system test (at least when I run it
locally). Also, as far as I understand, even though the code is within a
gexp-compiler, it doesn't even involve the store, as the call to format
happens before the g-expression is generated.

It sounds to me like adding #:use-modules (ice-9 format) to (gnu
services version-control) would fix this, but I'll wait until I can
reproduce the failure before re-adding the service.

Thanks,

Chris