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Launchd

To make an automatically executing per-user job (LaunchAgent) for every user:

  1. Read man launchd.plist. Place a job (i.e. plist for launchd) in ~/Library/LaunchAgents.
    • There is a naming convention for plists. Save your plist as org.yourdomain.plist (name yourdomain descriptive to the job).
    • Test it with launchctl load ~/Library/LaunchAgents. Remember to unload for edits. Sometimes a rogue LaunchAgent resists unload, I had to provoke error until launchd terminated it. Look at Console messages.
    • For example, launchd does not like quoted path strings in plist file. Nor binary plists made by defaults write (at least on Mac OS X 10.5).
  2. Unload the working plist, then copy it to /Library/LaunchAgents (authenticate when asked).
  3. Change the owner of the plist file to "system" ie. chown root:admin /Library/LaunchAgents/org.yourdomain.plist (At least Mac OS X 10.4 disliked a /Library job owned by an admin user).
  4. Set the permissions of the plist file to read only for others than owner: sudo chmod 644 /Library/LaunchAgents/org.yourdomain.plist

Example:

Automatically mount a disk image for every user. Tuomas Rosberg 2010.
Runs hdiutil to mount a disk image at login and when there is a change in /Volumes/.
Effectively keeps the disk image mounted at all times.
The fun thing was, no shell script file is needed. The command is in the plist, in ProgramArguments.

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
 	<key>Label</key>
 	<string>org.common.mount</string>
 	<key>OnDemand</key>
 	<true/>
 	<key>ProgramArguments</key>
 	<array>
 		<string>/usr/bin/hdiutil</string>
 		<string>attach</string>
 		<string>/Users/CommonVolume.sparseimage</string>
 	</array>
 	<key>RunAtLoad</key>
 	<true/>
 	<key>WatchPaths</key>
 	<array>
 		<string>/Volumes/</string>
 	</array>
 </dict>
 </plist>
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Sivua on viimeksi muokattu 16.01.2011, 01:23