Initial implementation of hooking the JLink scripts into the S2I

process.

Resolves OPENJDK-2179, OPENJDK-2180

Author: Josh-Matsuoka

modules/s2i/bash/artifacts/usr/local/s2i/assemble

@@ -14,3 +14,52 @@ source "${JBOSS_CONTAINER_JAVA_S2I_MODULE}/maven-s2i-overrides"
 # invoke the build
 maven_s2i_build
 
+#TODO: Clean this up to call the scripts instead
+
+shopt -s globstar
+echo "Setting environment variables"
+jarfile="/deployments/*.jar"
+libdir="/deployments/lib"
+$JAVA_HOME/
+
+echo "Checking that jarfile and libdir exist"
+test -f "$jarfile"
+test -d "$libdir"
+
+# Create a temporary directory for a module path
+mkdir dependencies
+cp /deployments/lib/**/*.jar dependencies
+# Calculate dependencies
+$JAVA_HOME/bin/jdeps --module-path dependencies --ignore-missing-deps --multi-release 11 -R -s \
+    "$jarfile" \
+    "$libdir"/**/*.jar \
+> deps.txt
+# Clean up temporary directory
+rm -rf dependencies
+
+# Strip down the dependencies to the ones we're looking for
+<deps.txt \
+  grep 'java\|jdk\.'  | # mostly removes target/, but also jdk8internals
+  sed -E "s/Warning: .*//" | #remove extraneous warnings
+  sed -E "s/.*-> //"  | # remove src of src -> dep
+  sed -E "s/.*\.jar//" | # remove extraneous dependencies
+  sed "s#/.*##"       | # delete anything after a slash. in practice target/..
+  sort | uniq |
+tee stripped-deps.txt
+
+echo "Checking against jdk modules"
+$JAVA_HOME/bin/java --list-modules > java-modules.txt
+cat java-modules.txt | sed "s/\\@.*//" > modules.txt
+grep -Fx -f stripped-deps.txt modules.txt | tr '\n' ',' | tr -d "[:space:]" > module-deps.txt
+echo "jdk.zipfs" >> module-deps.txt
+
+echo "Linking jre"
+$JAVA_HOME/bin/jlink --output runtime-jre \
+      	--add-modules $(cat module-deps.txt) \
+        -G --no-header-files --no-man-pages
+
+rm *.txt
+echo "Repacking jre"
+INSTALL_BASE="/lib/jvm/java-11-openjdk"
+JDK_IMAGE="runtime-jre"
+echo -n "Replacing shared libraries from JDK image '$JDK_IMAGE' with shared libraries from '$INSTALL_BASE'... "

modules/s2i/bash/module.yaml

@@ -15,6 +15,7 @@ modules:
   - name: jboss.container.maven.s2i
   - name: jboss.container.java.run
   - name: jboss.container.util.logging
+  - name: jboss.container.java.jlink
 
 packages:
   install:

modules/s2i/core/artifacts/opt/jboss/container/s2i/core/s2i-core

@@ -33,6 +33,7 @@ function s2i_core_env_init() {
   S2I_IMAGE_SOURCE_MOUNTS="${S2I_IMAGE_SOURCE_MOUNTS:-${CUSTOM_INSTALL_DIRECTORIES}}"
   S2I_ENABLE_INCREMENTAL_BUILDS="${S2I_ENABLE_INCREMENTAL_BUILDS:-true}"
   S2I_DELETE_SOURCE="${S2I_DELETE_SOURCE:-true}"
+  S2I_ENABLE_JLINK="${S2I_ENABLE_JLINK:-true}"
 }
 
 # extensions may override this method to initialize environment variables

modules/s2i/core/module.yaml

@@ -112,6 +112,12 @@ envs:
     Delete source files at the end of build.  Defaults to true.
   example: "false"
 
+- name: S2I_ENABLE_JLINK_WORKFLOW
+  description: ^
+    Enables the Jdeps/JLink workflow to minimize JRE size
+  example: "false"
+  value: false
+
 run:
   cmd:
   - "/usr/local/s2i/run"