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core: allow disabling system time correction if rtc returns time far in the future

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There might be (embedded) systems that get never updated (things like
e.g. entertainment systems of trains, for example) and where the adjustment of
the system clock (introduced by b10abe4bba) would
do the wrong thing even if the difference between the systemd build time and
the rtc is 15 years or more.

This patch allows disabling the adjustment by setting
'clock-valid-range-usec-max' meson option to 0 or to a negative value.
This commit is contained in:
Franck Bui
2022-08-24 21:39:46 +01:00
committed by Luca Boccassi
parent 34683dbdd0
commit 2306b4656a
2 changed files with 2 additions and 2 deletions
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src/shared/clock-util.c
+1 -1
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@@ -153,7 +153,7 @@ int clock_apply_epoch(ClockChangeDirection *ret_attempted_change) {
now_usec = now(CLOCK_REALTIME);
if (now_usec < epoch_usec)
*ret_attempted_change = CLOCK_CHANGE_FORWARD;
else if (now_usec > usec_add(epoch_usec, CLOCK_VALID_RANGE_USEC_MAX))
else if (CLOCK_VALID_RANGE_USEC_MAX > 0 && now_usec > usec_add(epoch_usec, CLOCK_VALID_RANGE_USEC_MAX))
*ret_attempted_change = CLOCK_CHANGE_BACKWARD;
else {
*ret_attempted_change = CLOCK_CHANGE_NOOP;