How to upgrade Jenkins on Mac OS X (daemon mode)

Jenkins, the continuous integration server, provides a nice package to run it on Mac OS X. It installs as a launch daemon and runs smoothly. But when a new version of Jenkins is available, there is no automatic upgrade feature. So here is how to upgrade this kind of installtion:

• Download the latest war of Jenkins from the website
• Stop the Jenkins daemon: in a Terminal window, type

sudo launchctl unload /Library/LaunchDaemons/org.jenkins-ci.plist

• Copy the downloaded "war" from your download directory to the "/Applications/Jenkins/" folder.
• Start the Jenkins daemon: in a Terminal window, type

sudo launchctl load /Library/LaunchDaemons/org.jenkins-ci.plist

Once Jenkins has restarted, you should have an up-to-date installation.