[systemd-devel] How to start a task after system boot but only on specific days using systemd.timer

[Jérémy Rosen]

On 10/01/2018 05:17, Andrei Borzenkov wrote:
> 09.01.2018 22:28, Joerg Diederich пишет:
>> Hello,
>>
>> I have a little (perhaps strange) requirement:
>> I want to execute a script about five minutes after system boot, but only on specific weekdays (e. g. Sundays) using systemd.timer. I tried a combination of OnBootSec and OnCalendar like
>>
>> OnBootSec=5m
>> OnCalendar=Sun
>>
>> but this doesn't work.
> Well, it works but not they way you want it :) As documented, multiple
> directives are additive - timer will trigger when any of them elapses.
> May be it could be expressed more obviously.

There is a workaround but it's a bit more complicated than it should be 
: use multiple timers.

timer1.timer ; OnBootSec=5m
timer1.service ; Wants=timer2

timer2.timer ; Oncalendar=Sun


Note that you need the intermediate unit, you cant user 
Unit=timer2.timer in timer1.timer because a timer is not allowed to 
start another time (I don't know why)

You can also have a look at https://github.com/systemd/systemd/pull/7023 
where II suggested something similar for upstream

Cheers
Jérémy


>> My script executes always after boot. I'm running systemd-228-38.1.x86_64 on SuSE LEAP 42.3. Of course, I can modify my script to ask for the current weekday, but I thought, it would be more elegant to configure it all together in the timer unit file.
> This would likely require new directive or at least new syntax. Timers
> define point in time, not period of time.
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