Optimize docker builds

Dockerfile.dependencies

@@ -0,0 +1,25 @@
+# This image will be published as dspace/dspace-dependencies
+# The purpose of this image is to make the build for dspace/dspace run faster 
+
+# Step 1 - Run Maven Build
+FROM maven as build
+ARG TARGET_DIR=dspace-installer
+WORKDIR /app
+
+# The Mirage2 build cannot run as root.  Setting the user to dspace.
+RUN useradd dspace \
+    && mkdir /home/dspace \
+    && chown -Rv dspace: /home/dspace
+USER dspace
+
+# Copy the DSpace source code into the workdir (excluding .dockerignore contents)
+ADD --chown=dspace . /app/
+COPY dspace/src/main/docker/local.cfg /app/local.cfg
+
+# Trigger the installation of all maven dependencies including the Mirage2 dependencies
+# Clean up the built artifacts in the same step to keep the docker image small
+RUN mvn package -Dmirage2.on=true && mvn clean
+
+# clear the contents of the /app directory so no artifacts are left when dspace:dspace is built
+USER root
+RUN rm -rf /app/*

Dockerfile.jdk8

@@ -9,26 +9,30 @@
 # - default tag for branch: dspace/dspace: dspace/dspace:dspace-6_x-jdk8
 
 # Step 1 - Run Maven Build
-FROM maven as build
+FROM dspace/dspace-dependencies:dspace-6_x as build
+ARG TARGET_DIR=dspace-installer
 WORKDIR /app
 
-# The Mirage2 build cannot run as root.  Setting the user to dspace.
+# The dspace-install directory will be written to /install
-RUN useradd dspace \
+RUN mkdir /install \
-    && mkdir /home/dspace \
+    && chown -Rv dspace: /install
-    && chown -Rv dspace: /home/dspace
+
 USER dspace
 
 # Copy the DSpace source code into the workdir (excluding .dockerignore contents)
 ADD --chown=dspace . /app/
 COPY dspace/src/main/docker/local.cfg /app/local.cfg
 
-RUN mvn package -Dmirage2.on=true
+# Build DSpace.  Copy the dspace-install directory to /install.  Clean up the build to keep the docker image small
+RUN mvn package -Dmirage2.on=true && \
+  mv /app/dspace/target/${TARGET_DIR}/* /install && \
+  mvn clean
 
 # Step 2 - Run Ant Deploy
 FROM tomcat:8-jre8 as ant_build
 ARG TARGET_DIR=dspace-installer
-COPY --from=build /app /dspace-src
+COPY --from=build /install /dspace-src
-WORKDIR /dspace-src/dspace/target/${TARGET_DIR}
+WORKDIR /dspace-src
 
 # Create the initial install deployment using ANT
 ENV ANT_VERSION 1.10.5

Dockerfile.jdk8-test

@@ -9,13 +9,13 @@
 # - default tag for branch: dspace/dspace: dspace/dspace:dspace-6_x-jdk8
 
 # Step 1 - Run Maven Build
-FROM maven as build
+FROM dspace/dspace-dependencies:dspace-6_x as build
+ARG TARGET_DIR=dspace-installer
 WORKDIR /app
 
-# The Mirage2 build cannot run as root.  Setting the user to dspace.
+RUN mkdir /install \
-RUN useradd dspace \
+    && chown -Rv dspace: /install
-    && mkdir /home/dspace \
+
-    && chown -Rv dspace: /home/dspace
 USER dspace
 
 # Copy the DSpace source code into the workdir (excluding .dockerignore contents)
@@ -26,13 +26,15 @@ COPY dspace/src/main/docker/local.cfg /app/local.cfg
 COPY dspace/src/main/docker/test/solr_web.xml /app/dspace-solr/src/main/webapp/WEB-INF/web.xml
 COPY dspace/src/main/docker/test/rest_web.xml /app/dspace-rest/src/main/webapp/WEB-INF/web.xml
 
-RUN mvn package -Dmirage2.on=true
+RUN mvn package -Dmirage2.on=true && \
+  mv /app/dspace/target/${TARGET_DIR}/* /install && \
+  mvn clean
 
 # Step 2 - Run Ant Deploy
 FROM tomcat:8-jre8 as ant_build
 ARG TARGET_DIR=dspace-installer
-COPY --from=build /app /dspace-src
+COPY --from=build /install /dspace-src
-WORKDIR /dspace-src/dspace/target/${TARGET_DIR}
+WORKDIR /dspace-src
 
 # Create the initial install deployment using ANT
 ENV ANT_VERSION 1.10.5