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@node update-leap Invocation
@section Invoking update-leap
@pindex update-leap
@cindex leap-seconds file manager/updater
@ignore
#
# EDIT THIS FILE WITH CAUTION (invoke-update-leap.texi)
#
# It has been AutoGen-ed March 21, 2017 at 10:40:30 AM by AutoGen 5.18.5
# From the definitions update-leap-opts.def
# and the template file agtexi-cmd.tpl
@end ignore
@code{update-leap}
will validate the file currently on the local system
and if necessary, updates leap-second definition file.
Ordinarily, the file is found using the "leapfile" directive in
@code{ntp.conf(5)}.
However, an alternate location can be specified on the command line.
If the file does not exist, is not valid, has expired, or is expiring soon,
a new copy will be downloaded. If the new copy validates, it is installed and
NTP is (optionally) restarted.
If the current file is acceptable, no download or restart occurs.
-c can also be used to invoke another script to perform administrative
functions, e.g. to copy the file to other local systems.
.PP
This can be run as a cron job. As the file is rarely updated, and leap
seconds are announced at least one month in advance (usually longer), it
need not be run more frequently than about once every three weeks.
.PP
For cron-friendly behavior, define CRONJOB=1 in the crontab.
.PP
This script depends on$REQUIREDCMDS
This section was generated by @strong{AutoGen},
using the @code{agtexi-cmd} template and the option descriptions for the @code{update-leap} program.
@menu
* update-leap usage:: update-leap help/usage (@option{--help})
* update-leap source-url:: source-url option (-s)
* update-leap ipv4:: ipv4 option (-4)
* update-leap destination:: destination option (-d)
* update-leap expiration:: expiration option (-e)
* update-leap ntp-conf-file:: ntp-conf-file option (-f)
* update-leap force-update:: force-update option (-F)
* update-leap exit status:: exit status
* update-leap Usage:: Usage
* update-leap Authors:: Authors
@end menu
@node update-leap usage
@subsection update-leap help/usage (@option{--help})
@cindex update-leap help
This is the automatically generated usage text for update-leap.
The text printed is the same whether selected with the @code{help} option
(@option{--help}) or the @code{more-help} option (@option{--more-help}). @code{more-help} will print
the usage text by passing it through a pager program.
@code{more-help} is disabled on platforms without a working
@code{fork(2)} function. The @code{PAGER} environment variable is
used to select the program, defaulting to @file{more}. Both will exit
with a status code of 0.
@exampleindent 0
@example
update-leap
Usage: $0 [options] [leapfile]
Verifies and if necessary, updates leap-second definition file
All arguments are optional: Default (or current value) shown: -s
Specify the URL of the master copy to download $LEAPSRC -d Specify
the filename on the local system $LEAPFILE -e Specify how long (in
days) before expiration the file is to be refreshed. Note that
larger values imply more frequent refreshes. "$PREFETCH" -f Specify
location of ntp.conf (used to make sure leapfile directive is
present and to default leapfile) $NTPCONF -F Force update even if
current file is OK and not close to expiring. -r Specify number of
times to retry on get failure $MAXTRIES -i Specify number of minutes
between retries $INTERVAL -l Use syslog for output (Implied if
CRONJOB is set) -L Don't use syslog for output -P Specify the syslog
facility for logging $LOGFAC -t Name of temporary file used in
validation $TMPFILE -q Only report errors to stdout -v Verbose
output
The following options are not (yet) implemented in the perl version:
-4 Use only IPv4 -6 Use only IPv6 -c Command to restart NTP after
installing a new file <none> - ntpd checks file daily -p 4|6 Prefer
IPv4 or IPv6 (as specified) addresses, but use either -z Specify
path for utilities $PATHLIST -Z Only use system path
$0 will validate the file currently on the local system
Ordinarily, the file is found using the "leapfile" directive in
$NTPCONF. However, an alternate location can be specified on the
command line.
If the file does not exist, is not valid, has expired, or is
expiring soon, a new copy will be downloaded. If the new copy
validates, it is installed and NTP is (optionally) restarted.
If the current file is acceptable, no download or restart occurs.
-c can also be used to invoke another script to perform
administrative functions, e.g. to copy the file to other local
systems.
This can be run as a cron job. As the file is rarely updated, and
leap seconds are announced at least one month in advance (usually
longer), it need not be run more frequently than about once every
three weeks.
For cron-friendly behavior, define CRONJOB=1 in the crontab.
Version $VERSION
@end example
@exampleindent 4
@node update-leap source-url
@subsection source-url option (-s)
@cindex update-leap-source-url
This is the ``the url of the master copy of the leapseconds file'' option.
This option takes a string argument.
Specify the URL of the master copy to download
$LEAPSRC
@node update-leap ipv4
@subsection ipv4 option (-4)
@cindex update-leap-ipv4
This is the ``use only ipv4 addresses for dns name resolution'' option.
@noindent
This option has some usage constraints. It:
@itemize @bullet
@item
must not appear in combination with any of the following options:
ipv6.
@end itemize
Force DNS resolution of following host names on the command line
to the IPv4 namespace.
_EndOfDoc_;
};
flag = {
name = ipv6;
flags-cant = ipv4, prefer;
value = 6;
descrip = "Use only IPv6 addresses for DNS name resolution";
doc = <<- _EndOfDoc_
Force DNS resolution of following host names on the command line
to the IPv6 namespace.
_EndOfDoc_;
};
flag = {
name = prefer;
flags-cant = ipv4, ipv6;
value = p;
arg-type = keyword;
keyword = 4, 6;
descrip = 'Prefer IPv4 or IPv6 (as specified) addresses, but use either';
doc = <<- _EndOfDoc_
Prefer IPv4 or IPv6 (as specified) addresses, but use either.
@node update-leap destination
@subsection destination option (-d)
@cindex update-leap-destination
This is the ``filename on the local system'' option.
This option takes a string argument @file{float}.
The name to use to store the leapfile on the local system.
$LEAPFILE
@node update-leap expiration
@subsection expiration option (-e)
@cindex update-leap-expiration
This is the ``refresh the leapfile this long before it expires'' option.
This option takes a string argument.
Specify how long before expiration the file is to be refreshed
Units are required, e.g. "-e 60 days" Note that larger values
imply more frequent refreshes.
"$PREFETCH"
@node update-leap ntp-conf-file
@subsection ntp-conf-file option (-f)
@cindex update-leap-ntp-conf-file
This is the ``location of the ntp.conf file'' option.
This option takes a string argument.
Specify location of ntp.conf (used to make sure leapfile directive is
present and to default leapfile)
/etc/ntp.conf
@node update-leap force-update
@subsection force-update option (-F)
@cindex update-leap-force-update
This is the ``force update of the leapfile'' option.
Force update even if current file is OK and not close to expiring.
@node update-leap exit status
@subsection update-leap exit status
One of the following exit values will be returned:
@table @samp
@item 0 (EXIT_SUCCESS)
Successful program execution.
@item 1 (EXIT_FAILURE)
The operation failed or the command syntax was not valid.
@end table
@node update-leap Usage
@subsection update-leap Usage
@node update-leap Authors
@subsection update-leap Authors
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