#!/usr/bin/env sh

#change docker options and start docker daemon

if [ $# -eq 1 ]; then

	# if `docker run` only has one arguments, we assume user is running alternate command like `bash` to inspect the image
	exec "$@"

else

	# if -tunnel is not provided try env vars
	case "$@" in
		*"-tunnel "*) ;;
		*)
		if [ ! -z "$JENKINS_TUNNEL" ]; then
			TUNNEL="-tunnel $JENKINS_TUNNEL"
		fi ;;
	esac

	# if -workDir is not provided try env vars
	if [ ! -z "$JENKINS_AGENT_WORKDIR" ]; then
		case "$@" in
			*"-workDir"*) echo "Warning: Work directory is defined twice in command-line arguments and the environment variable" ;;
			*)
			WORKDIR="-workDir $JENKINS_AGENT_WORKDIR" ;;
		esac
	fi

	if [ -n "$JENKINS_URL" ]; then
		URL="-url $JENKINS_URL"
	fi

	if [ -n "$JENKINS_NAME" ]; then
		JENKINS_AGENT_NAME="$JENKINS_NAME"
	fi  

	if [ -z "$JNLP_PROTOCOL_OPTS" ]; then
		echo "Warning: JnlpProtocol3 is disabled by default, use JNLP_PROTOCOL_OPTS to alter the behavior"
		JNLP_PROTOCOL_OPTS="-Dorg.jenkinsci.remoting.engine.JnlpProtocol3.disabled=true"
	fi

	# If both required options are defined, do not pass the parameters
	OPT_JENKINS_SECRET=""
	if [ -n "$JENKINS_SECRET" ]; then
		case "$@" in
			*"${JENKINS_SECRET}"*) echo "Warning: SECRET is defined twice in command-line arguments and the environment variable" ;;
			*)
			OPT_JENKINS_SECRET="${JENKINS_SECRET}" ;;
		esac
	fi
	
	OPT_JENKINS_AGENT_NAME=""
	if [ -n "$JENKINS_AGENT_NAME" ]; then
		case "$@" in
			*"${JENKINS_AGENT_NAME}"*) echo "Warning: AGENT_NAME is defined twice in command-line arguments and the environment variable" ;;
			*)
			OPT_JENKINS_AGENT_NAME="${JENKINS_AGENT_NAME}" ;;
		esac
	fi

	#TODO: Handle the case when the command-line and Environment variable contain different values.
	#It is fine it blows up for now since it should lead to an error anyway.

	exec java $JAVA_OPTS $JNLP_PROTOCOL_OPTS -cp /usr/share/jenkins/slave.jar hudson.remoting.jnlp.Main -headless $TUNNEL $URL $WORKDIR $OPT_JENKINS_SECRET $OPT_JENKINS_AGENT_NAME "$@"
fi