FROM openjdk:8-jre-alpine3.9

# 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="ca-certificates \
            curl \
            dpkg \
            fastjar \
            jq \
            loksh \
            bash \
            netcat-openbsd \
            openssl \
            shadow \
            util-linux \
            wget" \
        && apk add --no-cache ${DEPS} \
        # need fastjar for some projects to update app's jar on container restart
        && ln -snf /usr/bin/fastjar $JAVA_HOME/bin/jar \
        # Get the dpkg to properly download and install that version compatible to install GOSU on the image
        && dpkgArch="$(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