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Full Discussion: interval in a launchd script
Operating Systems OS X (Apple) interval in a launchd script Post 302297821 by choogendyk on Sunday 15th of March 2009 09:13:37 PM
Old 03-15-2009
Doesn't look like you're getting much response here.

I understand that launchd is intended to replace cron, among other things. And I haven't really looked at that aspect of launchd. I have created stuff that runs at startup with it.

What you are talking about has two components. One is the basic running things every 2 hours. If you've got that, then ok. I'd be inclined to just toss it in cron, because that still works.

The other aspect is how to deal with the previous instance still being running. If you create your own shell script, instead of directly running rsync, then you can do a couple of different things. One of the more common approaches is to implement a pid file. When the script runs, it checks to see if the pid file exists. If it does, the script terminates, with maybe a log or error message. If it doesn't it creates it. Then when it is done, it removes it.

So, something like

echo $$ > /var/run/runrsync.pid

would put the process id of the current script into that location.

Anyway, after the book keeping, the script would launch rsync.

Part of the reason I didn't respond sooner was that I don't know what facilities launchd has built in for managing this sort of thing. I could be giving you an outdated solution to something that launchd has solved more elegantly.
 

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LEARN ABOUT OSX

automountd

AUTOMOUNTD(8)						    BSD System Manager's Manual 					     AUTOMOUNTD(8)

NAME

     automountd -- automatic mount / unmount daemon for autofs

SYNOPSIS

     /usr/libexec/automountd [-v] [-n] [-T] [-o opts] [-D name=value]

DESCRIPTION

     automountd is a daemon that responds to requests from autofs to mount and unmount network filesystems, and to supply the contents of directo-
     ries, based on the contents of automounter maps. The automountd is started on demand by launchd(8).  As the daemon is launched by launchd,
     the options below would be specified in the ProgramArguments key in the launchd plist for automountd.  See FILES below.

OPTIONS

     -v      Log to syslogd(8) more detailed information about actions taken by automountd.

     -n      Disable browsing of all maps.

     -T      Increase by 1 the logging level for messages printed to the standard output information about requests received from autofs, process-
	     ing done for those requests, and replies sent to autofs.  The default level of 0 causes no information to be logged; each higher
	     value causes more information to be logged.

     -o opts
	     Apply the options specified by opts to all mounts by default.  The options for a particular mount can override these options.

     -D name=value
	     Set the environment value specified by name to the specified value.  Environment variables can be referred to in map entries; the
	     value of the environment variable is substituted for the reference to the variable.

FILES

     /etc/autofs.conf
	     configuration file used to manage automountd

     /System/Library/LaunchDaemons/com.apple.automountd.plist
	     launchd plist

SEE ALSO

     auto_master(5), autofsd(8), automount(8), autofs.conf(5), mount(8), mount_nfs(8), launchd(8), launchd.plist(5)

Darwin								   April 4, 2007							    Darwin
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