Presubmit upper-bound-check with Google Libraries BOM

.kokoro/bom-upper-bounds-check.sh

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+#!/bin/bash
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Presubmit to ensure the dependencies of the Google Libraries BOM, with the modification of change
+# in the PR, pick up the highest versions among transitive dependencies.
+# https://maven.apache.org/enforcer/enforcer-rules/requireUpperBoundDeps.html
+
+set -eo pipefail
+# Display commands being run.
+set -x
+
+cd github/google-cloud-java/
+
+# Print out tool version
+echo $JOB_TYPE
+java -version
+mvn -version
+git version
+
+# Make artifacts available for 'mvn validate' at the bottom
+mvn install -DskipTests=true -Dmaven.javadoc.skip=true -Dgcloud.download.skip=true -B -V
+
+# The property key for this repository in Google Libraries BOM
+VERSION_KEY=google.cloud.java.version
+# Read the version of POM. Example version: '0.116.1-alpha-SNAPSHOT'
+VERSION_POM=google-cloud-bom/pom.xml
+# Namespace (xmlns) prevents xmllint from specifying tag names in XPath
+VERSION=`sed -e 's/xmlns=".*"//' $VERSION_POM | xmllint --xpath '/project/version/text()' -`
+
+if [ -z "${VERSION}" ]; then
+  echo "Version is not found in ${VERSION_POM}"
+  exit 1
+fi
+echo "Version: ${VERSION}"
+
+# Run the upper bound check against Google Libraries BOM in cloud-opensource-java
+git clone https://github.com/GoogleCloudPlatform/cloud-opensource-java.git
+
+cd cloud-opensource-java/boms/cloud-oss-bom
+mvn install
+
+# This upper-bounds-check project has the enforcer rule with requireUpperBoundDeps
+cd ../upper-bounds-check
+mvn validate -D${VERSION_KEY}=${VERSION}

.kokoro/presubmit/bom-upper-bounds.cfg

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+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "gcr.io/cloud-devrel-kokoro-resources/java8"
+}
+
+env_vars: {
+  key: "TRAMPOLINE_BUILD_FILE"
+  value: "github/google-cloud-java/.kokoro/bom-upper-bounds-check.sh"
+}