[systemd-devel] How to create a timer that will only run once?

[Lennart Poettering]

On Di, 27.08.24 17:28, Konstantin Kharlamov (Hi-Angel at yandex.ru) wrote:

> There's a popular usecase of human-readably scheduling a command for
> later¹. There are multiple non-systemd solutions, but they generally
> involve running a 3rd party service, such as atd for at.
>
> This functional is provided by systemd though, e.g.:
>
> 	systemd-run --user --on-calendar=12:10 systemctl suspend
>
> There's just one problem: from now on this command will be running
> daily, unless you modify the time to include the date. But not only
> systemd doesn't allow syntax --on-calendar="today 12:10", even if it
> did that would be prone to mistakes when a user has time 21:32 and they
> think "I'm gonna schedule a command for today at 00:07", but that isn't
> actually "today" but "tomorrow".
>
> So, isn't there an option or something that would allow a user to
> specify time without having to worry the timer is going to be executed
> more than once?

We currently have no mechanism for this. I guess we could extend the
calendar time syntax with something like this, where we take the
current time, and then alter it in certain ways you specify. File a
github RFE issue about this.

Lennart

--
Lennart Poettering, Berlin