bug#26008: ‘guix offload test’ provides insufficient details upon failure

[Ludovic Courtès]

Hi,

address@hidden (Ludovic Courtès) skribis:

> on [2017-03-06] at 10:52 Ludovic Courtès writes:
>
>> Myles English <address@hidden> skribis:
>>
>>> Two hosts, setup the same as far as I can see, behave differently when
>>> trying to offload builds, any idea how I can get more information on
>>> what the #<unspecified> might indicate?  Looking at
>>> guix/scripts/offload.scm:551 suggests the result is not a string.
>>>
>>> $ guix offload test
>>> guix offload: testing 2 build machines defined in 
>>> '/etc/guix/machines.scm'...
>>> guix offload: 'host1.mydomain.co.uk' is running guile (GNU Guile) 2.0.13
>>> guix offload: 'host2.mydomain.co.uk' is running guile (GNU Guile) 2.0.13
>>> guix offload: Guix is usable on 'host1.mydomain.co.uk' (test returned 
>>> "/gnu/store/883yjkl46dxw9mzykykmbs0yzwyxm17z-test")
>>> guix offload: error: failed to use Guix module on 'host2.mydomain.co.uk'
>>> (test returned #<unspecified>)
>>
>> What you see here most likely means that host2 threw an exception while
>> executing this code:
>>
>>   
>> http://git.savannah.gnu.org/cgit/guix.git/tree/guix/scripts/offload.scm#n543
>>
>> The reason could be:
>>
>>   1. That the (guix …) modules could not be found in the search path
>>      (your tests suggest this is not the case);
>>
>>   2. That an exception was thrown, for instance because the ‘with-store’
>>      form failed to connect to the daemon on that machine (is the daemon
>>      running on that machine? Is it listening on
>>      /var/guix/daemon-socket/socket and not some other place?).
>
> Yes, that was probably the problem.  I have since updated the host
> systems, rebooted, restarted the daemons and now it works, thanks.
>
>> We should definitely improve that and provide details about the
>> exception, at least.
>
> Yes, I agree, because 'guix offload test' should provide useful details
> when it fails and not just when it succeeds.

Commit 4eb0f9ae05a9bf20fb91c49b39bebc687265c5e5 improves that.

Ludo’.