[launchd-dev] run once and then vaporize

[Blake Garner]

Thanks Quinn!

Your explanation was informative and solved my problem. I attempted to
have the script remove the .plist before but It was failing due to
permission problems. After correcting the permissions on my script
it's working!

blake

On Thu, Jul 24, 2008 at 7:43 AM, Quinn <eskimo1 at apple.com> wrote:
> At 19:15 -0700 23/7/08, Blake Garner wrote:
>>My test script currently just echo's some text into system.log and
>>exits. The script runs but the launchd item fails to unload or remove
>>itself.
>
> That's because launchd does not pass the ProgramArguments to a shell;
> rather, it invokes fork/exec (maybe even posix_spawn these days) with
> those arguments.  So the ";" isn't considered special.  If you modify
> your "runonce.sh" to print all of its arguments, you'll find that
> it's getting a whole bunch of extra ones (-:
>
> I don't think this ProgramArguments approach is going to work.  You
> will have to unload the job from your script.
>
> Alternatively, don't unload the job.  Once a job is loaded, it
> doesn't depend on the plist file, so removing the plist file out from
> underneath launchd won't cause you any problems.  The job will
> continue to exist in launchd (until the system restarts) but it won't
> get run against unless someone specifically invokes it.
>
> S+E
> --
> Quinn "The Eskimo!"                    <http://www.apple.com/developer/>
> Apple Developer Relations, Developer Technical Support, Core OS/Hardware
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