Merge pull request elastic/elasticsearch#1015 from rjernst/attach_without_subdir

Build: Change x-plugins setup with elasticsearch to a sibling directory

Original commit: elastic/x-pack-elasticsearch@d9f309c6db

build.gradle

@@ -1,11 +1,5 @@
-if (project.name != 'x-plugins') {
-  throw new GradleException('You must checkout x-plugins to a directory named x-plugins')
-}
-if (project.projectDir.parentFile.name != 'extra-plugins') {
-  throw new GradleException('You must place the x-plugins checkout in a directory named extra-plugins')
-}
-if (project.rootProject.projectDir != project.projectDir.parentFile.parentFile) {
-  throw new GradleException('You must place the extra-plugins directory inside the root of an elasticsearch checkout')
+if (project.projectDir.name != 'x-plugins') {
+  throw new GradleException('You must checkout x-plugins in a directory named x-plugins next to elasticsearch')
 }
 
 /*

buildSrc/settings.gradle

@@ -0,0 +1,6 @@
+File elasticsearchDir = new File(settingsDir, '../../elasticsearch')
+if (elasticsearchDir.exists() == false) {
+  throw new GradleException('Elasticsearch must be checked out as a sibling directory of x-plugins')
+}
+
+project(':').projectDir = new File(elasticsearchDir, 'buildSrc')

settings.gradle

@@ -0,0 +1,2 @@
+project(':').projectDir = new File('../elasticsearch')
+apply from: '../elasticsearch/settings.gradle'