[systemd-devel] Restarting a systemd service with new command line options from systemctl?

[Rick Beldin]

Hi...

I was trying to understand some systemd-udevd interactions and from source I
could see that if systemd-udevd was started with --debug option, it would log
additional items, for example:


 786                 /*
 787                  * We have partitions but re-reading the partition table
did not
 788                  * work, synthesize "change" for the disk and all partitions.
 789                  */
 790                 log_debug("device %s closed, synthesising 'change'",
udev_device_get_devnode(dev));
 791                 strscpyl(filename, sizeof(filename),
udev_device_get_syspath(dev), "/uevent", NULL);
 792                 write_string_file(filename, "change");

While the man page for systemd-udevd shows this option and others:

     /lib/systemd/systemd-udevd [--daemon] [--debug] [--children-max=]
[--exec-delay=]
                                   [--event-timeout=]
[--resolve-names=early|late|never]
                                   [--version] [--help]

I am puzzled as to how I would restart the daemon with anyone of these options
without hacking on the service file or killing the existing systemd-udevd and
starting it up manually.   I puzzled over this and tried:

# systemctl restart systemd-udevd --debug
systemctl: unrecognized option '--debug'

Is there a more supported way of doing this with systemctl for systemd-udevd,
perhaps in general for all systemd services?   I tend to think that there
isn't, but thought I would I ask.

Rick



-- 
Rick Beldin
HPE Master Technologist, ERT
HPE Pointnext
Tel:  +1 470 2129073  Email: rick.beldin at hpe.com
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