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Bug#964438: apt-listbugs: dns error when running from cron job

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On Tue, 7 Jul 2020 20:17:15 +0200 Oswald Buddenhagen wrote:

> On Tue, Jul 07, 2020 at 07:46:50PM +0200, Francesco Poli wrote:
> > • when did it begin?
> >
> i don't remember - i tend to ignore non-critical errors at first.

Mmmh, that's unfortunate: I think that knowing this would have helped a
bit...

> the journal doesn't say when it began, either, as it says that the 
> sevice "succeeded" despite the error mail ...
> 
> but there are actually clues in the journal:
> 
> there is a report every hour despite it claiming to be a daily job.  
> that's weird at least.

It works this way by design.

Basically, when the job completes without issues, it drops the date
into /var/spool/apt-listbugs/lastprefclean .
When the job encounters issues, it exits (with status 0).

The job is attempted hourly (with a randomized delay), but it does
nothing if it has already dropped the date
into /var/spool/apt-listbugs/lastprefclean on the same day (where "day"
is a 24 h time interval, starting at 7:00 a.m. local time).

The rationale is: the job must be attempted at various times, since the
network could be down sometimes.
But it must be completed (at most) once per day.

> 
> more importantly, there is another report (outside the hourly schedule) 
> right after waking up from sleep -

This must be due to "OnActiveSec=5min".
See /lib/systemd/system/apt-listbugs.timer

> and this one could plausibly 
> consistently run into a dns failure, as it runs before the network stack 
> is restarted.

Was your system offline 5 min after waking up from sleep?
If so, then it's the expected behavior...

> so it's systemd-related, just differently than i thought.

We still have to understand why it cannot query the DNS from the
systemd timer, while you are able to do so from the command line.

Please reply to the other questions in my previous message.



-- 
 http://www.inventati.org/frx/
 There's not a second to spare! To the laboratory!
..................................................... Francesco Poli .
 GnuPG key fpr == CA01 1147 9CD2 EFDF FB82  3925 3E1C 27E1 1F69 BFFE

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Bug#964438: apt-listbugs: dns error when running from cron job Oswald Buddenhagen <oswald.buddenhagen@gmx.de> - 2020-07-07 11:50 +0200
  Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-07 20:00 +0200
    Bug#964438: apt-listbugs: dns error when running from cron job Oswald Buddenhagen <oswald.buddenhagen@gmx.de> - 2020-07-07 20:30 +0200
      Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-07 23:00 +0200
        Bug#964438: apt-listbugs: dns error when running from cron job Oswald Buddenhagen <oswald.buddenhagen@gmx.de> - 2020-07-07 23:10 +0200
          Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-13 23:40 +0200
            Bug#964438: apt-listbugs: dns error when running from cron job Oswald Buddenhagen <oswald.buddenhagen@gmx.de> - 2020-07-14 10:40 +0200
              Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-14 23:00 +0200
                Bug#964438: apt-listbugs: dns error when running from cron job Oswald Buddenhagen <oswald.buddenhagen@gmx.de> - 2020-07-15 11:00 +0200
                Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-16 23:20 +0200
                Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-16 23:50 +0200
  Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-17 18:20 +0200
    Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-26 21:40 +0200
  Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-26 22:50 +0200
  Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-26 22:50 +0200
    Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-26 23:30 +0200
  Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-26 23:30 +0200
  Bug#964438: apt-listbugs: dns error when running from cron job Francesco Poli <invernomuto@paranoici.org> - 2020-07-27 23:40 +0200

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