[systemd-devel] safe and fast shutdown/reboot

[aleivag]

>
>
> Won't work. Status changes only when job for a unit completes and jobs
> are executed in order of dependencies. Actually, jobs are *queued* in
> order of dependencies so nothing would indicate that you are going to
> shutdown until it is too late (i.e. all normal services are stopped).
>
>
yes, but those units have started, so during a `systemctl reboot` you can
execute

[~] systemctl list-jobs shutdown.target reboot.target
 JOB UNIT            TYPE  STATE
1972 reboot.target   start waiting
1974 shutdown.target start waiting

2 jobs listed.

and get if shutdown has started

the other thing that may help you know if you are in shutdown mode is
execute `systemctl is-system-running`  and then check if returns `stopping`,
during a shutdown is suppose to return something like that. and i think it
does this by checking is shutdown.target has started (
https://github.com/systemd/systemd/blob/7a30dfeb18d09940a844389e06b25ca2bca5e093/src/core/manager.c#L3833-L3836
)


Logically runlevel is not changed until *after* new runlevel has been
> reached. Practically systemd does not update runlevel during shutdown at
> all.


yeap, you are right here, i was wrong :D
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