Update Jenkins on Mac OS X

update-jenkins.sh

#!/bin/bash

DEFAULT_URL=http://updates.jenkins-ci.org/current/latest/jenkins.war
TMP_PATH=/tmp/jenkins.war
APP_PATH=/Applications/Jenkins/jenkins.war
PLIST_PATH=/Library/LaunchDaemons/org.jenkins-ci.plist

url=${1-$DEFAULT_URL}

echo 'Downloading WAR package...'
curl -# $url > $TMP_PATH
if [ $? -ne 0 ]; then
    echo 'Fail to download WAR package.'
    exit 1
fi

echo 'Applying update...'
sudo -s -- <<EOF
launchctl unload $PLIST_PATH
mv -f $APP_PATH $APP_PATH.bak
mv $TMP_PATH $APP_PATH
chown root:wheel $APP_PATH
launchctl load $PLIST_PATH
EOF