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rtc: restore time from driftfile if later than RTC time

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This is useful on computers that have an RTC, but there is no battery to
keep the time when they are turned off and start with the same time on
each boot.
This commit is contained in:
Miroslav Lichvar
2015-10-06 15:52:36 +02:00
parent 1714d3e8ae
commit 6a9c756cf0
5 changed files with 53 additions and 44 deletions
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19
chrony.texi.in
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@@ -972,13 +972,9 @@ This option is useful when restarting @code{chronyd} and can be used
in conjunction with the `-r' option.
@item -s
This option will set the system clock from the computer's real-time
clock. This is analogous to supplying the `-s' flag to the
@file{/sbin/hwclock} program during the Linux boot sequence.
Support for real-time clocks is limited at present - the criteria are
described in the section on the @code{rtcfile} directive (@pxref{rtcfile
directive}).
This option will set the system clock from the computer's real-time clock or
to the last modification time of the file specified by the @code{driftfile}
directive. Real-time clocks are supported only on Linux.
If used in conjunction with the `-r' flag, @code{chronyd} will attempt
to preserve the old samples after setting the system clock from the real
@@ -989,11 +985,10 @@ to work well, it relies on @code{chronyd} having been able to determine
accurate statistics for the difference between the RTC and
system clock last time the computer was on.
If @code{chronyd} doesn't support the RTC on your computer or there is no RTC
installed, the system clock will be set with this option forward to the time of
the last modification of the drift file (specified by the @code{driftfile}
directive) to restore the system time at which @code{chronyd} was previously
stopped.
If the last modification time of the drift file is later than the current time
and the RTC time, the system time will be set to it to restore the time when
@code{chronyd} was previously stopped. This is useful on computers that have
no RTC or the RTC is broken (e.g. it has no battery).
@item -u <user>
This option sets the name of the system user to which @code{chronyd} will
switch after start in order to drop root privileges. It overrides the