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leapdb: support leap-seconds.list as second source

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The existing implementation of getting leap second information from a
timezone in get_tz_leap() relies on non-portable C library behaviour.

Specifically, mktime is not required to return '60' in the tm_sec field
when a leap second is inserted leading to "Timezone right/UTC failed
leap second check, ignoring" errors on musl based systems.

This patch adds support for getting leap second information from the
leap-seconds.list file included with tzdata and adds a new configuration
directive leapseclist to switch on the feature.
This commit is contained in:
Patrick Oppenlander
2024-02-08 14:36:28 +11:00
committed by Miroslav Lichvar
parent 83f90279b0
commit 53823b9f1c
5 changed files with 155 additions and 10 deletions
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20
doc/chrony.conf.adoc
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@@ -680,9 +680,10 @@ trusted and required source.
*tai*:::
This option indicates that the reference clock keeps time in TAI instead of UTC
and that *chronyd* should correct its offset by the current TAI-UTC offset. The
<<leapsectz,*leapsectz*>> directive must be used with this option and the
database must be kept up to date in order for this correction to work as
expected. This option does not make sense with PPS refclocks.
<<leapsectz,*leapsectz*>> or <<leapseclist,*leapseclist*>> directive must be
used with this option and the database must be kept up to date in order for
this correction to work as expected. This option does not make sense with PPS
refclocks.
*local*:::
This option specifies that the reference clock is an unsynchronised clock which
is more stable than the system clock (e.g. TCXO, OCXO, or atomic clock) and
@@ -1269,6 +1270,19 @@ $ TZ=right/UTC date -d 'Dec 31 2008 23:59:60'
Wed Dec 31 23:59:60 UTC 2008
----
[[leapseclist]]*leapseclist* _file_::
This directive specifies the path to a file containing a list of leap seconds
and TAI-UTC offsets in NIST/IERS format. It is recommended to use
the file _leap-seconds.list_ usually included with the system timezone
database. The behaviour of this directive is otherwise equivalent to
<<leapsectz,*leapsectz*>>.
+
An example of this directive is:
+
----
leapseclist /usr/share/zoneinfo/leap-seconds.list
----
[[makestep]]*makestep* _threshold_ _limit_::
Normally *chronyd* will cause the system to gradually correct any time offset,
by slowing down or speeding up the clock as required. In certain situations,