svn commit: r289421 - in head/etc: . mtree ntp
Warner Losh
imp at bsdimp.com
Sat Oct 17 23:48:23 UTC 2015
> On Oct 17, 2015, at 1:25 PM, Ian Lepore <ian at freebsd.org> wrote:
>
> On Sat, 2015-10-17 at 13:19 -0600, Warner Losh wrote:
>> Until the next leap second…. It would be better to just
>> always try to grab the latest one… Can we put something
>> in periodic to do that so users that have releases
>> that are older than 6 months aren’t screwed?
>>
>> Warner
>>
>
> I think writing a leapfeatcher task for periodic daily|weekly would
> make a nice junior-hacker task. It would be nice if it only hit the
> network when expiration of the installed file is imminent (like within
> a month), and only if both ntp and the leapfile feature are enabled and
> stuff like that. It should probably have a configurable list of URLs
> to fetch from.
It should be very easy to try to fetch it once a day in June and December
until you succeed from each of the URLs in a list, with the default
list being the two canonical (for the US at least) sources. Shouldn’t
be more than a dozen lines in a periodic script.
The BIPM also publishes this data in another form, as does USNO for the
paranoid that want to check. phk has also spearheaded an effort
to publish this data via DNS, but I don’t know if that’s live and
automated or just live and experimental…
Warner
> -- Ian
>
>>> On Oct 16, 2015, at 8:04 AM, Cy Schubert <cy at FreeBSD.org> wrote:
>>>
>>> Author: cy
>>> Date: Fri Oct 16 14:04:16 2015
>>> New Revision: 289421
>>> URL: https://svnweb.freebsd.org/changeset/base/289421
>>>
>>> Log:
>>> Add default leap-seconds file. This should help ntp networks get
>>> the
>>> leap second date correct
>>>
>>> Updates to the file can be obtained from ftp://time.nist.gov/pub/
>>> or
>>> ftp://tycho.usno.navy.mil/pub/ntp/.
>>>
>>> Suggested by: dwmalone
>>> Reviewed by: roberto, dwmalone, delphij
>>> Approved by: roberto
>>> MFC after: 1 week
>>>
>>> Added:
>>> head/etc/ntp/
>>> head/etc/ntp/Makefile (contents, props changed)
>>> head/etc/ntp/leap-seconds (contents, props changed)
>>> Modified:
>>> head/etc/Makefile
>>> head/etc/mtree/BSD.var.dist
>>> head/etc/ntp.conf
>>>
>>> Modified: head/etc/Makefile
>>> ===================================================================
>>> ===========
>>> --- head/etc/Makefile Fri Oct 16 12:53:22 2015 (r2894
>>> 20)
>>> +++ head/etc/Makefile Fri Oct 16 14:04:16 2015 (r2894
>>> 21)
>>> @@ -240,6 +240,9 @@ distribution:
>>> ${_+_}cd ${.CURDIR}/defaults; ${MAKE} install
>>> ${_+_}cd ${.CURDIR}/devd; ${MAKE} install
>>> ${_+_}cd ${.CURDIR}/gss; ${MAKE} install
>>> +.if ${MK_NTP} != "no"
>>> + ${_+_}cd ${.CURDIR}/ntp; ${MAKE} install
>>> +.endif
>>> ${_+_}cd ${.CURDIR}/periodic; ${MAKE} install
>>> .if ${MK_PKGBOOTSTRAP} != "no"
>>> ${_+_}cd ${.CURDIR}/pkg; ${MAKE} install
>>>
>>> Modified: head/etc/mtree/BSD.var.dist
>>> ===================================================================
>>> ===========
>>> --- head/etc/mtree/BSD.var.dist Fri Oct 16 12:53:22 2015
>>> (r289420)
>>> +++ head/etc/mtree/BSD.var.dist Fri Oct 16 14:04:16 2015
>>> (r289421)
>>> @@ -46,6 +46,8 @@
>>> ..
>>> ipf mode=0700
>>> ..
>>> + ntp mode=0700
>>> + ..
>>> pkg
>>> ..
>>> ports
>>>
>>> Modified: head/etc/ntp.conf
>>> ===================================================================
>>> ===========
>>> --- head/etc/ntp.conf Fri Oct 16 12:53:22 2015 (r2894
>>> 20)
>>> +++ head/etc/ntp.conf Fri Oct 16 14:04:16 2015 (r2894
>>> 21)
>>> @@ -77,3 +77,8 @@ restrict 127.127.1.0
>>> #
>>> #server 127.127.1.0
>>> #fudge 127.127.1.0 stratum 10
>>> +
>>> +# See
>>> http://support.ntp.org/bin/view/Support/ConfiguringNTP#Section_6.14
>>> .
>>> +# for documentation regarding leapfile. Updates to the file can be
>>> obtained
>>> +# from ftp://time.nist.gov/pub/ or
>>> ftp://tycho.usno.navy.mil/pub/ntp/.
>>> +leapfile "/etc/ntp/leap-seconds"
>>>
>>> Added: head/etc/ntp/Makefile
>>> ===================================================================
>>> ===========
>>> --- /dev/null 00:00:00 1970 (empty, because file is
>>> newly added)
>>> +++ head/etc/ntp/Makefile Fri Oct 16 14:04:16 2015 (r
>>> 289421)
>>> @@ -0,0 +1,10 @@
>>> +# $FreeBSD$
>>> +
>>> +NO_OBJ=
>>> +
>>> +FILES= leap-seconds
>>> +
>>> +FILESDIR= /etc/ntp
>>> +FILESMODE= 644
>>> +
>>> +.include <bsd.prog.mk>
>>>
>>> Added: head/etc/ntp/leap-seconds
>>> ===================================================================
>>> ===========
>>> --- /dev/null 00:00:00 1970 (empty, because file is
>>> newly added)
>>> +++ head/etc/ntp/leap-seconds Fri Oct 16 14:04:16 2015
>>> (r289421)
>>> @@ -0,0 +1,119 @@
>>> +#
>>> +# $FreeBSD$
>>> +#
>>> +# ATOMIC TIME.
>>> +# The Coordinated Universal Time (UTC) is the reference
>>> time scale derived
>>> +# from The "Temps Atomique International" (TAI) calculated
>>> by the Bureau
>>> +# International des Poids et Mesures (BIPM) using a
>>> worldwide network of atomic
>>> +# clocks. UTC differs from TAI by an integer number of
>>> seconds; it is the basis
>>> +# of all activities in the world.
>>> +#
>>> +#
>>> +# ASTRONOMICAL TIME (UT1) is the time scale based on the
>>> rate of rotation of the earth.
>>> +# It is now mainly derived from Very Long Baseline
>>> Interferometry (VLBI). The various
>>> +# irregular fluctuations progressively detected in the
>>> rotation rate of the Earth lead
>>> +# in 1972 to the replacement of UT1 by UTC as the reference
>>> time scale.
>>> +#
>>> +#
>>> +# LEAP SECOND
>>> +# Atomic clocks are more stable than the rate of the earth
>>> rotatiob since the later
>>> +# undergoes a full range of geophysical perturbations at
>>> various time scales (lunisolar
>>> +# and core-mantle torques,atmospheric and oceanic effetcs,
>>> ...)
>>> +# Leap seconds are needed to keep the two time scales in
>>> agreement, i.e. UT1-UTC smaller
>>> +# than 0.9 second. So, when necessary a "leap second" is
>>> introduced in UTC.
>>> +# Since the adoption of this system in 1972 it has been
>>> necessary to add 26 seconds to UTC,
>>> +# firstly due to the initial choice of the value of the
>>> second (1/86400 mean solar day of
>>> +# the year 1820) and secondly to the general slowing down
>>> of the Earth's rotation. It is
>>> +# theorically possible to have a negative leap second (a
>>> second removed from UTC), but so far,
>>> +# all leap seconds have been positive (a second has been
>>> added to UTC). Based on what we know about the earth's rotation,
>>> +# it is unlikely that we will ever have a negative leap
>>> second.
>>> +#
>>> +#
>>> +# HISTORY
>>> +# The first leap second was added on June 30, 1972. Until
>>> 2000, it was necessary in average to add a leap second at a rate
>>> +# of 1 to 2 years. Since 2000, due to the fact that the
>>> earth rate of rotation is accelerating, leap seconds are introduced
>>> +# with an average frequency of 3 to 4 years.
>>> +#
>>> +#
>>> +# RESPONSABILITY OF THE DECISION TO INTRODUCE A LEAP SECOND
>>> IN UTC
>>> +# The decision to introduce a leap second in UTC is the
>>> responsibility of the Earth Orientation Center of
>>> +# the International Earth Rotation and reference System
>>> Service (IERS). This center is located at Paris
>>> +# Observatory. According to international agreements, leap
>>> second date have to occur at fixed date :
>>> +# first preference is given to the end of December and
>>> June, and second preference at the end of March
>>> +# and September. Since the system was introduced in 1972,
>>> only dates in June and December were used.
>>> +#
>>> +# Questions or comments to:
>>> +# Daniel Gambis, daniel.gambis at obspm.fr
>>> +# Christian Bizouard:
>>> christian.bizouard at obspm.fr
>>> +# Earth orientation Center of the IERS
>>> +# Paris Observatory, France
>>> +#
>>> +#
>>> +#
>>> +# VALIDITY OF THE FILE
>>> +# It is important to express the validity of the file.
>>> These next two dates are
>>> +# given in units of seconds since 1900.0.
>>> +#
>>> +# 1) Last update of the file.
>>> +#
>>> +# Updated through IERS Bulletin C (
>>> ftp://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat)
>>> +#
>>> +# The following line shows the last update of this file in
>>> NTP timestamp:
>>> +#
>>> +#$ 3645216000
>>> +#
>>> +# 2) Expiration date of the file given on a semi-annual
>>> basis: last June or last December
>>> +#
>>> +# File expires on 28 December 2015
>>> +#
>>> +# Expire date in NTP timestamp:
>>> +#
>>> +#@ 3660249600
>>> +#
>>> +#
>>> +# LIST OF LEAP SECONDS
>>> +# NTP timestamp (X parameter) is the number of seconds
>>> since 1900.0
>>> +#
>>> +# MJD: The Modified Julian Day number. MJD = X/86400 +
>>> 15020
>>> +#
>>> +# DTAI: The difference DTAI= TAI-UTC in units of seconds
>>> +# It is the quantity to add to UTC to get the time in TAI
>>> +#
>>> +# Day Month Year : epoch in clear
>>> +#
>>> +#NTP Time DTAI Day Month Year
>>> +#
>>> +2272060800 10 # 1 Jan 1972
>>> +2287785600 11 # 1 Jul 1972
>>> +2303683200 12 # 1 Jan 1973
>>> +2335219200 13 # 1 Jan 1974
>>> +2366755200 14 # 1 Jan 1975
>>> +2398291200 15 # 1 Jan 1976
>>> +2429913600 16 # 1 Jan 1977
>>> +2461449600 17 # 1 Jan 1978
>>> +2492985600 18 # 1 Jan 1979
>>> +2524521600 19 # 1 Jan 1980
>>> +2571782400 20 # 1 Jul 1981
>>> +2603318400 21 # 1 Jul 1982
>>> +2634854400 22 # 1 Jul 1983
>>> +2698012800 23 # 1 Jul 1985
>>> +2776982400 24 # 1 Jan 1988
>>> +2840140800 25 # 1 Jan 1990
>>> +2871676800 26 # 1 Jan 1991
>>> +2918937600 27 # 1 Jul 1992
>>> +2950473600 28 # 1 Jul 1993
>>> +2982009600 29 # 1 Jul 1994
>>> +3029443200 30 # 1 Jan 1996
>>> +3076704000 31 # 1 Jul 1997
>>> +3124137600 32 # 1 Jan 1999
>>> +3345062400 33 # 1 Jan 2006
>>> +3439756800 34 # 1 Jan 2009
>>> +3550089600 35 # 1 Jul 2012
>>> +3644697600 36 # 1 Jul 2015
>>> +#
>>> +# In order to verify the integrity of this file, a hash
>>> code
>>> +# has been generated. For more information how to use
>>> +# this hash code, please consult the README file under the
>>> +# 'sha' repertory.
>>> +#
>>> +#h 620ba8af 37900668 95ac09ba d77640f9 6fd75493
>>>
>>
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