FROM openjdk:8-jdk-alpine

LABEL Garrett Mills <shout@garrettmills.dev>

RUN apk add --no-cache curl tar bash procps

# Downloading and installing Maven
ARG MAVEN_VERSION=3.6.3
ARG USER_HOME_DIR="/root"
ARG BASE_URL=https://apache.osuosl.org/maven/maven-3/${MAVEN_VERSION}/binaries

RUN mkdir -p /usr/share/maven /usr/share/maven/ref \
  && echo "Downlaoding maven" \
  && curl -fsSL -o /tmp/apache-maven.tar.gz ${BASE_URL}/apache-maven-${MAVEN_VERSION}-bin.tar.gz \
  \
  && echo "Unziping maven" \
  && tar -xzf /tmp/apache-maven.tar.gz -C /usr/share/maven --strip-components=1 \
  \
  && echo "Cleaning and setting links" \
  && rm -f /tmp/apache-maven.tar.gz \
  && ln -s /usr/share/maven/bin/mvn /usr/bin/mvn

ENV MAVEN_HOME /usr/share/maven
ENV MAVEN_CONFIG "$USER_HOME_DIR/.m2"

# Downloading and installing Gradle
# 1- Define a constant with the version of gradle you want to install
ARG GRADLE_VERSION=4.10.3

# 2- Define the URL where gradle can be downloaded from
ARG GRADLE_BASE_URL=https://services.gradle.org/distributions

# 3- Define the SHA key to validate the gradle download
#    obtained from here https://gradle.org/release-checksums/
ARG GRADLE_SHA=8626cbf206b4e201ade7b87779090690447054bc93f052954c78480fa6ed186e

# 4- Create the directories, download gradle, validate the download, install it, remove downloaded file and set links
RUN mkdir -p /usr/share/gradle /usr/share/gradle/ref \
  && echo "Downlaoding gradle hash" \
  && curl -fsSL -o /tmp/gradle.zip ${GRADLE_BASE_URL}/gradle-${GRADLE_VERSION}-bin.zip \
  \
  && echo "Checking download hash" \
  && echo "${GRADLE_SHA}  /tmp/gradle.zip" | sha256sum -c - \
  \
  && echo "Unziping gradle" \
  && unzip -d /usr/share/gradle /tmp/gradle.zip \
   \
  && echo "Cleaning and setting links" \
  && rm -f /tmp/gradle.zip \
  && ln -s /usr/share/gradle/gradle-${GRADLE_VERSION} /usr/bin/gradle

# 5- Define environmental variables required by gradle
ENV GRADLE_VERSION 4.10.3
ENV GRADLE_HOME /usr/bin/gradle
ENV GRADLE_USER_HOME /cache

ENV PATH $PATH:$GRADLE_HOME/bin

VOLUME $GRADLE_USER_HOME

CMD [""]