Build: Add fake project to include buildSrc as normal project

This is a follow up to #18173 and includes adding pom generation to the
fake build-tools project, which is really just buildSrc, but builds
during normal builds.

buildSrc/.gitignore

@@ -0,0 +1 @@
+build-bootstrap/

buildSrc/build.gradle

@@ -1,5 +1,3 @@
-import java.nio.file.Files
-
 /*
  * Licensed to Elasticsearch under one or more contributor
  * license agreements. See the NOTICE file distributed with
@@ -19,25 +17,21 @@ import java.nio.file.Files
  * under the License.
  */
 
-// we must use buildscript + apply so that an external plugin
-// can apply this file, since the plugins directive is not
-// supported through file includes
-buildscript {
-  repositories {
-    jcenter()
-  }
-  dependencies {
-    classpath 'com.bmuschko:gradle-nexus-plugin:2.3.1'
-  }
-}
+import java.nio.file.Files
+
 apply plugin: 'groovy'
-apply plugin: 'com.bmuschko.nexus'
-// TODO: move common IDE configuration to a common file to include
-apply plugin: 'idea'
-apply plugin: 'eclipse'
 
 group = 'org.elasticsearch.gradle'
-archivesBaseName = 'build-tools'
+
+if (project == rootProject) {
+  // change the build dir used during build init, so that doing a clean
+  // won't wipe out the buildscript jar
+  buildDir = 'build-bootstrap'
+}
+
+/*****************************************************************************
+ *         Propagating version.properties to the rest of the build           *
+ *****************************************************************************/
 
 Properties props = new Properties()
 props.load(project.file('version.properties').newDataInputStream())
@@ -51,13 +45,30 @@ if (snapshot) {
   props.put("elasticsearch", version);
 }
 
+File tempPropertiesFile = new File(project.buildDir, "version.properties")
+task writeVersionProperties {
+  inputs.properties(props)
+  outputs.file(tempPropertiesFile)
+  doLast {
+    OutputStream stream = Files.newOutputStream(tempPropertiesFile.toPath());
+    try {
+      props.store(stream, "UTF-8");
+    } finally {
+      stream.close();
+    }
+  }
+}
+
+processResources {
+  dependsOn writeVersionProperties
+  from tempPropertiesFile
+}
+
+/*****************************************************************************
+ *                    Dependencies used by the entire build                  *
+ *****************************************************************************/
 
 repositories {
-  mavenCentral()
-  maven {
-    name 'sonatype-snapshots'
-    url "https://oss.sonatype.org/content/repositories/snapshots/"
-  }
   jcenter()
 }
 
@@ -78,50 +89,80 @@ dependencies {
   compile 'org.apache.rat:apache-rat:0.11'
 }
 
-File tempPropertiesFile = new File(project.buildDir, "version.properties")
-task writeVersionProperties {
-  inputs.properties(props)
-  outputs.file(tempPropertiesFile)
-  doLast {
-    OutputStream stream = Files.newOutputStream(tempPropertiesFile.toPath());
-    try {
-      props.store(stream, "UTF-8");
-    } finally {
-      stream.close();
+
+/*****************************************************************************
+ *                    Bootstrap repositories and IDE setup                   *
+ *****************************************************************************/
+// this will only happen when buildSrc is built on its own during build init
+if (project == rootProject) {
+
+  // TODO: move common IDE configuration to a common file to include
+  apply plugin: 'idea'
+  apply plugin: 'eclipse'
+
+  repositories {
+    mavenCentral()
+    maven {
+      name 'sonatype-snapshots'
+      url "https://oss.sonatype.org/content/repositories/snapshots/"
     }
   }
-}
-
-processResources {
-  dependsOn writeVersionProperties
-  from tempPropertiesFile
-}
 
-extraArchive {
-  javadoc = false
-  tests = false
-}
+  idea {
+    module {
+      inheritOutputDirs = false
+      outputDir = file('build-idea/classes/main')
+      testOutputDir = file('build-idea/classes/test')
+    }
+  }
 
-idea {
-  module {
-    inheritOutputDirs = false
-    outputDir = file('build-idea/classes/main')
-    testOutputDir = file('build-idea/classes/test')
+  eclipse {
+    classpath {
+      defaultOutputDir = file('build-eclipse')
+    }
   }
-}
 
-eclipse {
-  classpath {
-    defaultOutputDir = file('build-eclipse')
+  task copyEclipseSettings(type: Copy) {
+    from project.file('src/main/resources/eclipse.settings')
+    into '.settings'
+  }
+  // otherwise .settings is not nuked entirely
+  tasks.cleanEclipse {
+    delete '.settings'
   }
+  tasks.eclipse.dependsOn(cleanEclipse, copyEclipseSettings)
 }
 
-task copyEclipseSettings(type: Copy) {
-  from project.file('src/main/resources/eclipse.settings')
-  into '.settings'
-}
-// otherwise .settings is not nuked entirely
-tasks.cleanEclipse {
-  delete '.settings'
+/*****************************************************************************
+ *                           Normal project checks                           *
+ *****************************************************************************/
+
+// this happens when included as a normal project in the build, which we do
+// to enforce precommit checks like forbidden apis, as well as setup publishing
+if (project != rootProject) {
+  apply plugin: 'elasticsearch.build'
+  apply plugin: 'nebula.maven-base-publish'
+  apply plugin: 'nebula.maven-scm'
+
+  // groovydoc succeeds, but has some weird internal exception...
+  groovydoc.enabled = false
+
+  // build-tools is not ready for primetime with these...
+  dependencyLicenses.enabled = false
+  forbiddenApisMain.enabled = false
+  jarHell.enabled = false
+  loggerUsageCheck.enabled = false
+  thirdPartyAudit.enabled = false
+
+  // test for elasticsearch.build tries to run with ES...
+  test.enabled = false
+
+  // TODO: re-enable once randomizedtesting gradle code is published and removed from here
+  licenseHeaders.enabled = false
+
+  forbiddenPatterns {
+    exclude '**/*.wav'
+    // the file that actually defines nocommit
+    exclude '**/ForbiddenPatternsTask.groovy'
+  }
 }
-tasks.eclipse.dependsOn(cleanEclipse, copyEclipseSettings)

buildSrc/src/main/groovy/org/elasticsearch/gradle/BuildPlugin.groovy

@@ -232,7 +232,7 @@ class BuildPlugin implements Plugin<Project> {
      */
     static void configureConfigurations(Project project) {
         // we are not shipping these jars, we act like dumb consumers of these things
-        if (project.path.startsWith(':test:fixtures')) {
+        if (project.path.startsWith(':test:fixtures') || project.path == ':build-tools') {
             return
         }
         // fail on any conflicting dependency versions

settings.gradle

@@ -1,6 +1,7 @@
 rootProject.name = 'elasticsearch'
 
 List projects = [
+  'build-tools',
   'rest-api-spec',
   'core',
   'docs',
@@ -60,6 +61,8 @@ if (isEclipse) {
 
 include projects.toArray(new String[0])
 
+project(':build-tools').projectDir = new File(rootProject.projectDir, 'buildSrc')
+
 if (isEclipse) {
   project(":core").projectDir = new File(rootProject.projectDir, 'core/src/main')
   project(":core").buildFileName = 'eclipse-build.gradle'