hanjinpeng
0e7033215d
`systemctl reboot --when=yesterday` reboots the machine immediately, which surprised users enough to be reported as a bug. It is not one: the timestamp passed to --when= (and to ScheduleShutdown(), and to shutdown(8)) declares the earliest point in time the action may be taken, it is not a condition that is evaluated and that could fail. Behaving any differently would be racy and surprising: "--when=now" refers to the past by the time the request is processed, and "--when=+50ms" may well have elapsed already due to scheduling latencies. In both cases we must still carry out the action the user asked for. Document the semantics explicitly in systemctl(1), shutdown(8) and the org.freedesktop.login1(5) D-Bus interface documentation. Fixes: #42437
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