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

[Michael Biebl]

Am 26.07.20 um 23:12 schrieb Francesco Poli:
> On Sun, 26 Jul 2020 22:48:18 +0200 Michael Biebl wrote:
> 
>> Am 26.07.20 um 22:43 schrieb Francesco Poli:
>>> On Sun, 26 Jul 2020 22:22:55 +0200 Michael Biebl wrote:
>>>
>>> [...]
>>>> Afaics, the problem is, that your service does not properly handle the
>>>> case, when the network is not available.
>>>
>>> It does, that's the reason why the operation is attempted hourly.
>>
>> The bug report was about apt-listbugs throwing an error if network is
>> not available.
> 
> We can argue that the service should be more silent in case of network
> errors, or maybe it's OK that it throws an error.
> But that's not the point.
> 
> The point is that the timer triggers during wake-up, while it should
> behave as it does during a boot (wait for at least 5 min and then
> trigger hourly, with a random delay).
> 
>>
>>>> Even if systemd would delay timer events after a resume: How long should
>>>> it wait? 30s, 1min? How would that robustly solve your problem? How
>>>> would that guarantee that after 1min network is available?
>>>
>>> It should wait at least 5 min (as specified in OnActiveSec=5min),
>>
>> That is not what OnActiveSec=5min means
> 
> Then I think the systemd.timer(5) man page should be clarified.
> It states:
> 
>            │OnActiveSec=       │ Defines a timer relative   │
>            │                   │ to the moment the timer    │
>            │                   │ unit itself is activated.  │
> 
> I thought this meant that an OnActiveSec=5min timer triggers 5 min
> after being activated.
> And the timer is either inactive during sleep (then it's activated
> again during wake-up and it should wait 5 min before triggering) or
> considered as active during sleep (but then the OnActiveSec should have
> already happened 5 min after boot and should not happen again during
> wake-up).

The timer is activated during boot and then stays active (unless you
stop it with systemctl stop foo.timer).
You can query the state with systemctl status.
A system sleep does not deactivate a timer.


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