[systemd-devel] Add timer exception

[Jérémy Rosen]

I would have my timer be duration-based instead of calandar based 
(assuming that fits your need)

You could use one of the following

OnActiveSec=48h (two days after the timer last triggered
OnUnitActiveSec=48h (two days afte the unit was last started)

Or slightly different

OnUnitInactiveSec=24h (one day after the service FINISHED)

In all those cases, since this is interval based, you would need a way 
to "prime the pump" I usually do this with

OnStartupSec=15m (1/4h after the machine was started)

or simply by enabling the service itself so it's part of the boot 
sequence (this will work with OnUnitActive and OnUnitInactive, but not 
with OnActive)

On 05/11/2018 09:36, Andy Pieters wrote:
> Dear Systemd list
>
> I have got a job that I want to execute every other day.
>
> The job is rather lengthy and takes more than 24 hours to complete but
> less than 48.
>
> So here are my criteria:
>
> Start today
> Start the day after tomorrow (t+2d)*1
> Start the (t+2d)*2
> Start 2 days after that (t+2d)*n
>
>
> My timer unit:
>
> [Timer]
> OnCalendar=*-*-01,03,05,07,09,11,13,15,17,19,21,23,25,27,29,31 03:30:00
>
> The problem with that is when I simulate the execution dates,
> specifically at newyear:
>
> Tue 2018-12-25 03:30:00 CET
> Thu 2018-12-27 03:30:00 CET
> Sat 2018-12-29 03:30:00 CET
>      Mon 2018-12-31 03:30:00 CET
>      Tue 2019-01-01 03:30:00 CET
> Thu 2019-01-03 03:30:00 CET
> Sat 2019-01-05 03:30:00 CET
> Mon 2019-01-07 03:30:00 CET
> Wed 2019-01-09 03:30:00 CET
>
> We can see that the timer would be triggered two days in a row.
>
> What can we do about this, please? Is there a better way to define a
> timer to run every other day? Can we perhaps add an exception for a
> specific date?
>
> Thank you kindly
>
> Keep up the good work!
>
>
>
> Andy
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