updated Java S2I build

incubating/wrappers/s2i/java/Dockerfile.build

@@ -1,4 +1,5 @@
-FROM seldonio/core-builder:0.3
+ARG IMAGE_SOURCE=seldonio/core-builder:0.3
+FROM $IMAGE_SOURCE
 
 LABEL io.openshift.s2i.scripts-url="image:///s2i/bin"
 

incubating/wrappers/s2i/java/Dockerfile.runtime

@@ -1,4 +1,5 @@
-FROM openjdk:8u131-jre-alpine
+ARG IMAGE_SOURCE=openjdk:8u131-jre-alpine
+FROM $IMAGE_SOURCE
 
 RUN apk update && apk add bash
 

incubating/wrappers/s2i/java/bin/build.sh

@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+set -x
+
+#
+# Print the usage and exit.
+#
+function usage () {
+  echo "Usage: $0 [OPTIONS] VERSION"
+  echo "\r\n"
+  echo "Options: "
+  echo " --build-source-image   (OPTIONAL) override the build image source image"
+  echo " --build-runtime-image  (OPTIONAL) override the runtime image source image"
+  exit 1
+}
+
+# Parse the arguments.
+# loop until last - 1, we assume the last arg is the model name
+while [[ $# -ge 2 ]]
+do
+  key="$1"
+  case ${key} in
+  --build-source-image)
+    BUILD_SOURCE_IMAGE="$2"
+    shift # past key
+    shift # past value
+  ;;
+  --runtime-source-image)
+    RUNTIME_SOURCE_IMAGE="$2"
+    shift # past key
+    shift # past value
+  ;;
+  *)
+	usage
+  ;;
+esac
+done
+
+# assign last parameter to model
+VERSION=${@:${#@}}
+IMAGE_BUILD_BUILD_ARGS=""
+IMAGE_RUNTIME_BUILD_ARGS=""
+
+# Validate the arguments.
+if [[ -z "$VERSION" ]]; then
+  echo "Missing argument: VERSION."
+  usage
+fi
+
+# Prepare Docker build args ( if supplied )
+if ! [[ -z "$BUILD_SOURCE_IMAGE" ]]; then
+  IMAGE_BUILD_BUILD_ARGS=$(echo "$IMAGE_BUILD_BUILD_ARGS --build-arg IMAGE_SOURCE=$BUILD_SOURCE_IMAGE" | awk '{$1=$1};1')
+fi
+if ! [[ -z "$RUNTIME_SOURCE_IMAGE" ]]; then
+  IMAGE_RUNTIME_BUILD_ARGS=$(echo "$IMAGE_RUNTIME_BUILD_ARGS --build-arg IMAGE_SOURCE=$RUNTIME_SOURCE_IMAGE" | awk '{$1=$1};1')
+fi
+
+IMAGE_NAME_BUILD=docker.io/seldonio/seldon-core-s2i-java-build:${VERSION}
+IMAGE_NAME_RUNTIME=docker.io/seldonio/seldon-core-s2i-java-runtime:${VERSION}
+
+echo "S2I build image: building..."
+docker build \
+    -f Dockerfile.build \
+    -t ${IMAGE_NAME_BUILD} \
+    ${IMAGE_BUILD_BUILD_ARGS} \
+    .
+echo "S2I build image: check Java version..."
+docker run --entrypoint "/bin/bash" ${IMAGE_NAME_BUILD} "-c" "java --version"
+
+echo "S2I runtime image: building..."
+docker build \
+    -f Dockerfile.runtime \
+    -t ${IMAGE_NAME_RUNTIME} \
+    ${IMAGE_RUNTIME_BUILD_ARGS} \
+    .
+echo "S2I runtime image: check Java version..."
+docker run --entrypoint "/bin/bash" ${IMAGE_NAME_RUNTIME} "-c" "java --version"