Jenkins slave connection managed by launchd

io.jenkins.slave.plist

<?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>io.jenkins.slave</string>
    <key>ProgramArguments</key>
    <array>
        <!-- If authentication is not required, you can launch via Java Web Start directly in the plist.
             Otherwise you need a script like below.
        <string>/usr/bin/javaws</string>
        <string>-wait</string>
        <string>-Xnosplash</string>
        <string>$JENKINS_URL/computer/$SLAVE_NAME/slave-agent.jnlp</string>
        -->
        <string>/path/to/jenkins-slave.sh</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>KeepAlive</key>
    <true/>
    <key>ThrottleInterval</key>
    <integer>180</integer>
  </dict>
</plist>

jenkins-slave.sh

#!/bin/sh

JENKINS_URL=http://my.jenkins.instance
JENKINS_TEMP=/tmp/jenkins
mkdir -p $JENKINS_TEMP
cd $JENKINS_TEMP
curl -O $JENKINS_URL/jnlpJars/slave.jar
java -Dfile.encoding=UTF-8 \
     -jar slave.jar \
     # Use login credentials or slave secret
     #-jnlpCredentials $USERNAME:$PASSWORD \ 
     -secret $SLAVE_SECRET \
     -jnlpUrl $JENKINS_URL/computer/$SLAVE_NAME/slave-agent.jnlp