[launchd-dev] Launching a process on demand?

[Conrad Taylor]

Hi, I'm attempting to configure the MySQL launchd plist file to launch MySQL
process only when needed.  At this time, it's launched at boot/startup and
it stays alive.  At this time, the script looks as follows:
BEGIN org.macports.mysql5.plist:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "
http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Debug</key>
<false/>
<key>Label</key>
<string>org.macports.mysql5</string>
<key>OnDemand</key>
<false/>
<key>ProgramArguments</key>
<array>
<string>/opt/local/bin/daemondo</string>
<string>--label=mysql5</string>
<string>--start-cmd</string>
<string>/opt/local/etc/LaunchDaemons/org.macports.mysql5/mysql5.wrapper</string>
<string>start</string>
<string>;</string>
<string>--stop-cmd</string>
<string>/opt/local/etc/LaunchDaemons/org.macports.mysql5/mysql5.wrapper</string>
<string>stop</string>
<string>;</string>
<string>--restart-cmd</string>
<string>/opt/local/etc/LaunchDaemons/org.macports.mysql5/mysql5.wrapper</string>
<string>restart</string>
<string>;</string>
<string>--pid=none</string>
</array>
<key>RunAtLoad</key>
<false/>
</dict>
</plist>

END org.macports.mysql5.plist:

I changed the above key/value pair to OnDemand/true.  Now, the process
doesn't start when I try to access it by doing the following:

> mysql5 <RETURN>

Is there a manual which clearly describes these key/value pairs?  I guess
I'm interested in the key/value pair, OnDemand, and when/how
it works.

-Conrad
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