FROM ubuntu:16.04

# Set the version of the gosu command and if needs to be, it can be modified at runtime
ENV GOSU_VERSION 1.10

# For building the image in a proxy environment if necessary
ARG HTTP_PROXY
ARG HTTPS_PROXY
ARG no_proxy

ENV HTTP_PROXY   ${HTTP_PROXY}
ENV HTTPS_PROXY  ${HTTPS_PROXY}
ENV http_proxy   ${HTTP_PROXY}
ENV https_proxy  ${HTTPS_PROXY}
ENV no_proxy  127.0.0.1,localhost,${no_proxy}

RUN \
    # Put all the dependencies into this variable to easily install everything
    DEPS="wget ca-certificates curl ksh git openjdk-8-jre-headless jq vim netcat uuid-runtime" &&  \
    # Run the update before for the package manager to properly fetch install packages
    apt-get update && \
    # Install the recommended dependencies
    apt-get install -y --no-install-recommends $DEPS && \
    # Remove all the cache for the apt package manager
    rm -rf /var/lib/apt/lists/* && \
    # Get the dpkg to properly download and install that version compatible to install GOSU on the image
    dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')" && \
    \
    # Downloads the gosu command based on the dpkg version and gosu version supplied
    wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
    \
    # Use GPG to install the gosu application locally
    chmod +x /usr/local/bin/gosu

ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64