Fold amazon-s3 into super project

Author: ywelsch

plugins/repository-s3/build.gradle

@@ -1,3 +1,6 @@
+import org.elasticsearch.gradle.MavenFilteringHack
+import org.elasticsearch.gradle.test.AntFixture
+
 /*
  * Licensed to Elasticsearch under one or more contributor
  * license agreements. See the NOTICE file distributed with
@@ -64,14 +67,50 @@ test {
   exclude '**/*CredentialsTests.class'
 }
 
-check {
-  // also execute the QA tests when testing the plugin
-  dependsOn 'qa:amazon-s3:check'
+boolean useFixture = false
+
+String s3AccessKey = System.getenv("amazon_s3_access_key")
+String s3SecretKey = System.getenv("amazon_s3_secret_key")
+String s3Bucket = System.getenv("amazon_s3_bucket")
+String s3BasePath = System.getenv("amazon_s3_base_path")
+
+if (!s3AccessKey && !s3SecretKey && !s3Bucket && !s3BasePath) {
+  s3AccessKey = 's3_integration_test_access_key'
+  s3SecretKey = 's3_integration_test_secret_key'
+  s3Bucket = 'bucket_test'
+  s3BasePath = 'integration_test'
+  useFixture = true
+}
+
+/** A task to start the AmazonS3Fixture which emulates an S3 service **/
+task s3Fixture(type: AntFixture) {
+  dependsOn testClasses
+  env 'CLASSPATH', "${ -> project.sourceSets.test.runtimeClasspath.asPath }"
+  executable = new File(project.runtimeJavaHome, 'bin/java')
+  args 'org.elasticsearch.repositories.s3.AmazonS3Fixture', baseDir, s3Bucket
+}
+
+Map<String, Object> expansions = [
+  'bucket': s3Bucket,
+  'base_path': s3BasePath
+]
+
+processTestResources {
+  inputs.properties(expansions)
+  MavenFilteringHack.filter(it, expansions)
 }
 
 integTestCluster {
-  keystoreSetting 's3.client.integration_test.access_key', "s3_integration_test_access_key"
-  keystoreSetting 's3.client.integration_test.secret_key', "s3_integration_test_secret_key"
+  keystoreSetting 's3.client.integration_test.access_key', s3AccessKey
+  keystoreSetting 's3.client.integration_test.secret_key', s3SecretKey
+
+  if (useFixture) {
+    dependsOn s3Fixture
+    /* Use a closure on the string to delay evaluation until tests are executed */
+    setting 's3.client.integration_test.endpoint', "http://${-> s3Fixture.addressAndPort}"
+  } else {
+    println "Using an external service to test the repository-s3 plugin"
+  }
 }
 
 thirdPartyAudit.excludes = [