Update frameworks that work automatically in the background occasionally need to schedule reboots. Systemd-logind already provides a nice mechanism to schedule shutdowns, send notfications and block logins short before the time. Systemd has a framework for calendar events, so we may conveniently use logind to define a maintenance time for reboots. The existing ScheduleShutdown DBus method in logind expects a usec_t with an absolute time. Passing USEC_INFINITY as magic value now tells logind to take the time from the configured maintenance time if set. "shutdown -r" leverages that and uses the maintenance time automatically if configured. The one minute default is still used if nothing was specified. Similarly the new 'auto' setting for the --when parameter of systemctl uses the maintenance time if configured or a one minute timer like the shutdown command.
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