Install Jenkins plugins

install_jenkins_plugins.sh

#!/bin/bash

host=http://localhost:8080
url=/pluginManager/installNecessaryPlugins

# git plugin https://wiki.jenkins-ci.org/display/JENKINS/Git+Plugin
curl -X POST -d '<jenkins><install plugin="git@2.0" /></jenkins>' --header 'Content-Type: text/xml' $host$url

# artifactory plugin https://wiki.jenkins-ci.org/display/JENKINS/Artifactory+Plugin
curl -X POST -d '<jenkins><install plugin="artifactory@2.2.1" /></jenkins>' --header 'Content-Type: text/xml' $host$url

# wait 20 sec
sleep 20

# jenkins safe restart
curl -X POST $host/safeRestart

So I kept trying this with Jenkins 2.145 but just getting redirected to the updateCenter page and never actually triggering a plugin installation. After much looking I found a comment where somebody mentioned you don't need the XML data and can just pass a form submission of -F "plugin.$PLUGIN.default=on" to $JENKINS_HOST/pluginManager/install and it will trigger the installation. I haven't tested passing multiple plugins at once yet, but the $PLUGIN bit is simply the 'short name' of the plugin which is what is most often used anyways. Because it uses updateCenter you probably can't pass a specific version (updateCenter always pulls latest), but I haven't fully experimented with all the options.