On Jul 6, 2009, at 10:11 PM, Conrad Taylor wrote:

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:

When you start inserting semi-colons into your ProgramArguments, it's time to wrap it all up in a simple shell script.

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:

OnDemand is deprecated. If you want the job launched on-demand, you can define a Sockets dictionary or a MachServices dictionary. Though since you're dealing with MySQL, I'm guessing you want the former. To see an example of a job that's launched on-demand when there is a connection to a socket, check out the SampleD example and BetterAuthorizationSample.

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.

launchd.plist(5)
--
Damien Sorresso
BSD Engineering
Apple Inc.