@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 February 27, 2018 at 04:55:50 PM 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 Usage: update-leap [options] Verifies and if necessary, updates leap-second definition file All arguments are optional: Default (or current value) shown: -C Absolute path to CA Cert (see SSL/TLS Considerations) -D Path to a CAdir (see SSL/TLS Considerations) -e Specify how long (in days) before expiration the file is to be refreshed. Note that larger values imply more frequent refreshes. 60 -F Force update even if current file is OK and not close to expiring. -f Absolute path ntp.conf file (default /etc/ntp.conf) /etc/ntp.conf -h show help -i Specify number of minutes between retries 10 -L Absolute path to leapfile on the local system (overrides value in ntp.conf) -l Specify the syslog(3) facility for logging LOG_USER -q Only report errors (cannot be used with -v) -r Specify number of attempts to retrieve file 6 -s Send output to syslog(3) - implied if STDOUT has no tty or redirected -t Send output to terminal - implied if STDOUT attached to terminal -u Specify the URL of the master copy to download https://www.ietf.org/timezones/data/leap-seconds.list -v Verbose - show debug messages (cannot be used with -q) 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 - ntpd checks file daily -p 4|6 Prefer IPv4 or IPv6 (as specified) addresses, but use either update-leap will validate the file currently on the local system. Ordinarily, the leapfile is found using the 'leapfile' directive in /etc/ntp.conf. However, an alternate location can be specified on the command line with the -L flag. If the leapfile does not exist, is not valid, has expired, or is expiring soon, a new copy will be downloaded. If the new copy is valid, it is installed. If the current file is acceptable, no download or restart occurs. 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. SSL/TLS Considerations ----------------------- The perl modules can usually locate the CA certificate used to verify the peer's identity. On BSDs, the default is typically the file /etc/ssl/certs.pem. On Linux, the location is typically a path to a CAdir - a directory of symlinks named according to a hash of the certificates' subject names. The -C or -D options are available to pass in a location if no CA cert is found in the default location. External Dependencies --------------------- The following perl modules are required: HTTP::Tiny - version >= 0.056 IO::Socket::SSL - version >= 1.56 NET::SSLeay - version >= 1.49 Version: 1.004 @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