Add labels per OCI specification

This commit also sneaks in a build argument to toggle JMX and its
associated port.

Author: kriation

Diff for: Dockerfile

@@ -7,6 +7,8 @@ RUN yum install git && \
 	java -jar BuildTools.jar -rev $SPIGOT_VERSION
 
 FROM kriation/centos7-jre8 as spigot-config
+LABEL maintainer="[email protected]"
+ARG BUILD_DATE
 ARG SPIGOT_VERSION=latest
 ARG MC_EULA=false
 ARG MC_SERVER_MEM=1024M
@@ -16,6 +18,16 @@ ARG MC_SERVER_QUERY_PORT=25565
 ARG MC_SERVER_RCON=false
 ARG MC_SERVER_RCON_PORT=25567
 ARG MC_SERVER_RCON_PASS
+ARG JMX_ON=false
+ARG JMX_PORT=9000
+LABEL org.label-schema.build-date=$BUILD_DATE \
+	org.label-schema.name="CentOS v7 with Spigot" \
+	org.label-schema.version=$SPIGOT_VERSION \
+	org.label-schema.url="https://github.com/kriation/docker-spigot" \
+	org.opencontainers.image.created=$BUILD_DATE \
+	org.opencontainers.image.title="CentOS v7 with Spigot" \
+	org.opencontainers.image.version=$SPIGOT_VERSION \
+	org.opencontainers.iamge.url="https://github.com/kriation/docker-spigot"
 ENV SPIGOT_VERSION=${SPIGOT_VERSION:-latest} \
 	MC_SERVER_MEM=${MC_SERVER_MEM:-1024M}  \
 	MC_SERVER_PORT=${MC_SERVER_PORT:-25565}  \
@@ -24,11 +36,9 @@ ENV SPIGOT_VERSION=${SPIGOT_VERSION:-latest} \
 	MC_SERVER_RCON=${MC_SERVER_RCON:-false}  \
 	MC_SERVER_RCON_PORT=${MC_SERVER_RCON_PORT:-25567}  \
 	MC_SERVER_RCON_PASS=${MC_SERVER_RCON_PASS} \
-	MC_EULA=${MC_EULA:-false}
-LABEL build-date="" \
-		license="" \
-		name="Spigot-$SPIGOT_VERSION" \
-		vendor=""
+	MC_EULA=${MC_EULA:-false} \
+	JMX_ON=${JMX_ON:-false} \
+	JMX_PORT=${JXM_PORT:-9000}
 WORKDIR /opt/spigot
 COPY --from=spigot-builder /tmp/spigot/spigot*.jar /tmp/spigot-$SPIGOT_VERSION.jar
 COPY config/* /opt/spigot/
@@ -42,11 +52,11 @@ RUN	sed -i 's/\(server-port=\)[[:print:]]*/\1'"$MC_SERVER_PORT"'/g' server.prope
 	sed -i 's/\(query.port=\)[[:print:]]*/\1'"$MC_SERVER_QUERY_PORT"'/g' server.properties && \
 	sed -i 's/\(rcon.port=\)[[:print:]]*/\1'"$MC_SERVER_RCON_PORT"'/g' server.properties && \
 	sed -i 's/\(rcon.password=\)[[:print:]]*/\1'"$MC_SERVER_RCON_PASS"'/g' server.properties
-EXPOSE $MC_SERVER_PORT $MC_SERVER_QUERY_PORT $MC_SERVER_RCON_PORT
+EXPOSE $MC_SERVER_PORT $MC_SERVER_QUERY_PORT $MC_SERVER_RCON_PORT $JMX_PORT
 VOLUME /opt/spigot
 ENTRYPOINT /usr/bin/java -Xms$MC_SERVER_MEM -Xmx$MC_SERVER_MEM -XX:+UseG1GC \
--Dcom.sun.management.jmxremote \
--Dcom.sun.management.jmxremote.port=9000 \
+-Dcom.sun.management.jmxremote=$JMX_ON \
+-Dcom.sun.management.jmxremote.port=$JMX_PORT \
 -Dcom.sun.management.jmxremote.local.only=false \
 -Dcom.sun.management.jmxremote.authenticate=false \
 -Dcom.sun.management.jmxremote.ssl=false \