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rtc: set clock to mtime of driftfile when RTC preinit fails

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When the RTC preinit function fails, set the system clock to the time of
the last modification of the driftfile if it's in the future. This makes
the -s option somewhat useful on systems where RTC is not supported or
missing.

This is similar to the functionality implemented in the fake-hwclock
script.
This commit is contained in:
Miroslav Lichvar
2014-08-18 18:21:24 +02:00
parent e0af8069c1
commit a5e9e5d0df
3 changed files with 51 additions and 16 deletions
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14
chrony.texi.in
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@@ -1018,18 +1018,20 @@ Support for real-time clocks is limited at present - the criteria are
described in the section on the @code{rtcfile} directive (@pxref{rtcfile
directive}).
If @code{chronyd} cannot support the real time clock on your computer,
this option cannot be used and a warning message will be logged to the
syslog.
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
time clock. This can be used to allow @code{chronyd} to perform long
time clock (RTC). This can be used to allow @code{chronyd} to perform long
term averaging of the gain or loss rate across system reboots, and is
useful for dial-up systems that are shut down when not in use. For this
to work well, it relies on @code{chronyd} having been able to determine
accurate statistics for the difference between the real time clock and
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 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.
@item -u <user>
This option sets the name of the user to which will @code{chronyd} switch to
drop root privileges if compiled with Linux capabilities support (default