#!/bin/sh

# This script do the following :
# Use jenkins-cli.jar
#	Verify if an update is available for Jenkins plugins.
#		Create a file you need to monitore.
#
# How-to use it ?
#	Run it with `jenkins_check_update
#	Add a symlink to /etc/cron.daily
#		ln -s $(pwd)/jenkins_check_update /etc/cron.daily/

JENKINS_HOME="/var/lib/jenkins"
JENKINS_CLI_JAR="${JENKINS_HOME}/war/WEB-INF/jenkins-cli.jar"
JENKINS_AUTH_FILE="/root/.jenkins.auth"

JENKINS_PLUGIN_UPDATE_LOG="${JENKINS_HOME}/.update_plugin"

if [ ! -f "${JENKINS_CLI_JAR}" ]; then
	printf '%b\n' "Jenkins-cli (${JENKINS_CLI_JAR}) does not seem to be available."
	exit 1
fi

if [ ! -f "${JENKINS_AUTH_FILE}" ]; then
	printf '%b\n' "Jenkins authentication file (${JENKINS_AUTH_FILE}) does not seem to be available."
	exit 1
fi

cd "$(dirname ${JENKINS_AUTH_FILE})" || exit
# Verify if updates are availables for plugins
if java -jar "${JENKINS_CLI_JAR}" -s http://127.0.0.1:8080 -auth @.jenkins.auth list-plugins | grep -i -q -- "(.*)$"
then
	touch "${JENKINS_PLUGIN_UPDATE_LOG}"
	#printf '%b\n' "Please upgrade plugins"
else
	rm -f "${JENKINS_PLUGIN_UPDATE_LOG}"
	#printf '%b\n' "Nothing to do"
fi
cd - > /dev/null || exit

exit 0