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Debugging an mcron job


From: Jack Hill
Subject: Debugging an mcron job
Date: Mon, 11 Mar 2019 16:05:12 -0400 (EDT)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)

Hi Guix,

I'm looking for help or tips on debugging an mcron job. My goal is to run a site-specific telemetry script that I have packaged [0] in my channel. The script collects some information and sends it to a remote server. I am trying to run the script as an mcron job via a service I created in my channel [1].

[0] 
https://gitlab.oit.duke.edu/jackhill/guix-at-duke/blob/0ed0a8e7530ef32b9e268d43b36944e38defa5f1/guix-at-duke/packages/endpoint-management.scm#L98-140
[1] 
https://gitlab.oit.duke.edu/jackhill/guix-at-duke/blob/0ed0a8e7530ef32b9e268d43b36944e38defa5f1/guix-at-duke/services/endpoint-management.scm

So far, this looks good, and after pulling my channel, reconfiguring, and restarting mcron, I can see my job in herd schedule mcron:

"""
# herd schedule mcron
Tue Mar 12 00:51:00 2019 -0400
/gnu/store/61692zjpkhy3jqv4a7jk1k8a14k6yn8k-planisphere-report-0-0.1b606af/bin/planisphere-report
…
"""

However, this doesn't appear to work because after the appointed time, the remote server is not updated. If I run the planisphere-report command by hand, the remote server is updated.

If I replace the planisphere-report command in my job with "/run/current-system/profile/bin/touch /tmp/test-file", test-file is indeed touched, so I know that the jobs are running.

Being fairly new to Guix, and extremely new to mcron, I don't know how to debug further. Are jobs run in such a way that they don't have network access? How can I see any errors or output?

Best,
Jack

P.S. I'm happy to accept any comments about how to improve the code in my channel as well ☺.
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