[systemd-devel] "semaphore" for .timer-triggered run

[Johannes Ernst]

> On Aug 2, 2019, at 22:45, Andrei Borzenkov <arvidjaar at gmail.com> wrote:
> 
> 02.08.2019 23:24, Johannes Ernst пишет:
>> I have a oneshot .service (certbot) that is run by its .timer with:
>> 
>> OnCalendar=daily
>> RandomizedDelaySec=1day
>> 
>> I also have a sometimes long-running script that may modify the same data. So the script and the oneshot service should never run at the same time.
>> 
> 
> If script itself runs as oneshot service, then putting After in your
> certbot.service should do it (it should wait for prerequisite service to
> complete).

No, the other script is a command-line tool invoked by the user.

> 
>> Is there a good systemd pattern for some kind of semaphore-like thing that will delay the execution of the oneshot service and try again when the script is done running?
>> 
>> I could skip execution, but then I miss an entire day until the service is run again -- I’d prefer it if it tried again a few minutes later. Or I could poll for some flag before running the main part of the service. Wondering whether there something more systemd-native.
>> 
>> Thanks,
>> 
>> 
>> 
>> Johannes.
>> 
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> 
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