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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
// This file contains tasks for the gradle wrapper generation.
// Ensure the wrapper script is generated based on the version defined in the project
// and not the version installed on the machine running the task.
// Read more about the wrapper here:
wrapper {
gradleVersion = versions.gradle
distributionType = Wrapper.DistributionType.ALL
distributionUrl = "${gradleDistUrlBase}/gradle-${versions.gradle}"
// Custom task to inject support for downloading the gradle wrapper jar if it doesn't exist.
// This allows us to avoid checking in the jar to our repository.
// Additionally adds a license header to the wrapper while editing the file contents.
task bootstrapWrapper() {
// In the doLast block so this runs when the task is called and not during project configuration.
doLast {
def wrapperBasePath = "\$APP_HOME/gradle/wrapper"
def wrapperJarPath = wrapperBasePath + "/gradle-wrapper.jar"
// Add a trailing zero to the version if needed.
def fullVersion = versions.gradle.count(".") == 1 ? "${versions.gradle}.0" : versions.gradle
def wrapperJarUrl = wrapperBaseUrl + "/gradle-wrapper.jar"
def bootstrapString = """
# Loop in case we encounter an error.
for attempt in 1 2 3; do
if [ ! -e $wrapperJarPath ]; then
if ! curl -s -S --retry 3 -L -o "$wrapperJarPath" "$wrapperJarUrl"; then
rm -f "$wrapperJarPath"
# Pause for a bit before looping in case the server throttled us.
sleep 5
def wrapperScript = wrapper.scriptFile
def wrapperLines = wrapperScript.readLines()
wrapperScript.withPrintWriter { out ->
def bootstrapWritten = false
wrapperLines.each { line ->
// Print the wrapper bootstrap before the first usage of the wrapper jar.
if (!bootstrapWritten && line.contains("gradle-wrapper.jar")) {
bootstrapWritten = true
wrapper.finalizedBy bootstrapWrapper
// Remove the generated batch file since we don't test building in the Windows environment.
task removeWindowScript(type: Delete) {
delete "$rootDir/gradlew.bat"
wrapper.finalizedBy removeWindowScript