Detect and prevent configuration that triggers a Gradle bug

build.gradle

@@ -222,7 +222,7 @@ subprojects {
     "org.elasticsearch.gradle:build-tools:${version}": ':build-tools',
     "org.elasticsearch:rest-api-spec:${version}": ':rest-api-spec',
     "org.elasticsearch:elasticsearch:${version}": ':server',
-    "org.elasticsearch:elasticsearch-cli:${version}": ':libs:cli',
+    "org.elasticsearch:elasticsearch-cli:${version}": ':libs:elasticsearch-cli',
     "org.elasticsearch:elasticsearch-core:${version}": ':libs:core',
     "org.elasticsearch:elasticsearch-nio:${version}": ':libs:nio',
     "org.elasticsearch:elasticsearch-x-content:${version}": ':libs:x-content',
@@ -579,6 +579,21 @@ gradle.projectsEvaluated {
       }
     }
   }
+  // Having the same group and name for distinct projects causes Gradle to consider them equal when resolving
+  // dependencies leading to hard to debug failures. Run a check across all project and prevent this from happening.
+  // see: https://github.com/gradle/gradle/issues/847
+  Map coordsToProject = [:]
+  project.allprojects.forEach { p ->
+    String coords = "${p.group}:${p.name}"
+    if (false == coordsToProject.putIfAbsent(coords, p)) {
+      throw new GradleException(
+              "Detected that two projects: ${p.path} and ${coordsToProject[coords].path} " +
+                      "have the same name and group: ${coords}. " +
+                      "This doesn't currently work correctly in Gradle, see: " +
+                      "https://github.com/gradle/gradle/issues/847"
+      )
+    }
+  }
 }
 
 if (System.properties.get("build.compare") != null) {

client/test/build.gradle

@@ -25,6 +25,8 @@ apply plugin: 'elasticsearch.build'
 targetCompatibility = JavaVersion.VERSION_1_7
 sourceCompatibility = JavaVersion.VERSION_1_7
 
+group = "${group}.client.test"
+
 dependencies {
   compile "org.apache.httpcomponents:httpcore:${versions.httpcore}"
   compile "com.carrotsearch.randomizedtesting:randomizedtesting-runner:${versions.randomizedrunner}"

libs/cli/build.gradle

@@ -24,16 +24,6 @@ apply plugin: 'nebula.optional-base'
 apply plugin: 'nebula.maven-base-publish'
 apply plugin: 'nebula.maven-scm'
 
-publishing {
-    publications {
-        nebula {
-            artifactId 'elasticsearch-cli'
-        }
-    }
-}
-
-archivesBaseName = 'elasticsearch-cli'
-
 dependencies {
     compile 'net.sf.jopt-simple:jopt-simple:5.0.2'
     compile "org.elasticsearch:elasticsearch-core:${version}"

plugins/discovery-ec2/qa/build.gradle

@@ -0,0 +1 @@
+group = "${group}.plugins.discovery-ec2.qa"

plugins/repository-azure/qa/build.gradle

@@ -0,0 +1 @@
+group = "${group}.plugins.repository-azure.qa"

plugins/repository-gcs/qa/build.gradle

@@ -0,0 +1 @@
+group = "${group}.plugins.repository-gcs.qa"

settings.gradle

@@ -131,3 +131,5 @@ if (extraProjects.exists()) {
 
 // enable in preparation for Gradle 5.0
 enableFeaturePreview('STABLE_PUBLISHING')
+
+project(":libs:cli").name = 'elasticsearch-cli'

x-pack/qa/rolling-upgrade/with-system-key/build.gradle

@@ -0,0 +1 @@
+group = "${group}.x-pack.qa.rolling-upgrade.with-system-key"

x-pack/qa/rolling-upgrade/without-system-key/build.gradle

@@ -0,0 +1 @@
+group = "${group}.x-pack.qa.rolling-upgrade.without-system-key"

x-pack/qa/sql/security/build.gradle

@@ -4,6 +4,8 @@ dependencies {
 
 Project mainProject = project
 
+group = "${group}.x-pack.qa.sql.security"
+
 subprojects {
   // Use resources from the parent project in subprojects
   sourceSets {