Dockerfile

# -- Build time image --
FROM maven:3-eclipse-temurin-17 AS build

LABEL maintainer="petter@fourmation.se"

ARG LOCATION=/usr/local/a

# Copy all required source code into the image
RUN mkdir --parents ${LOCATION}/
COPY pom.xml ${LOCATION}/
COPY LICENSE ${LOCATION}/
COPY README.md ${LOCATION}/
COPY src ${LOCATION}/src

# The default hostname is 'localhost'
# But in a docker container that is still inside the container only
# We need to replace 'localhost' with 'host.docker.internal'
# and otherwise, user still needs to specify the alternative
RUN sed --in-place \
	-e 's/localhost:/host.docker.internal:/' \
	${LOCATION}/src/main/java/co/nordlander/a/A.java

# Build the A software in the usual way
RUN cd /usr/local/a && mvn package -DskipTests

# -- Runtime Image --
FROM eclipse-temurin:17

COPY --from=build /usr/local/a/target/*-jar-with-dependencies.jar /a/a.jar

# Create a new command that is always in the PATH
RUN echo "#!/bin/sh" > /usr/bin/a && \
	echo "java \
		-Dnashorn.args=--no-deprecation-warning \
		-cp /a/a.jar \
		co.nordlander.a.A \"\$@\"" >> /usr/bin/a && \
	chmod a+rx /usr/bin/a
RUN cat /usr/bin/a

# This will only show the usage
CMD a

# a more useful use is:
#	docker run a a --get queue1
# note that 'a' has to be specified twice
# the first one is the image name
# the second one is the 'alternative' commands that we want to run