From 0a593109d37d3d5ff149f31abe02544a18cc6723 Mon Sep 17 00:00:00 2001
From: Ryan Ernst <ryan@iernst.net>
Date: Thu, 29 Oct 2015 17:12:45 -0700
Subject: [PATCH] Build: Add gradle version check and some build info that is
 always output

---
 buildSrc/build.gradle                         | 10 ++++-----
 .../elasticsearch/gradle/BuildPlugin.groovy   | 22 +++++++++++++++++++
 2 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/buildSrc/build.gradle b/buildSrc/build.gradle
index e987a173bae..eadf1f63784 100644
--- a/buildSrc/build.gradle
+++ b/buildSrc/build.gradle
@@ -46,11 +46,11 @@ props.load(project.file('../gradle.properties').newDataInputStream())
 version = props.getProperty('version')
 
 processResources {
-    inputs.file('../gradle.properties')
-    filter ReplaceTokens, tokens: [
-        'version': props.getProperty('version'),
-        'luceneVersion': props.getProperty('luceneVersion')
-    ]
+  inputs.file('../gradle.properties')
+  filter ReplaceTokens, tokens: [
+    'version': props.getProperty('version'),
+    'luceneVersion': props.getProperty('luceneVersion')
+  ]
 }
 
 extraArchive {
diff --git a/buildSrc/src/main/groovy/org/elasticsearch/gradle/BuildPlugin.groovy b/buildSrc/src/main/groovy/org/elasticsearch/gradle/BuildPlugin.groovy
index 4b550acc9e4..ee666771319 100644
--- a/buildSrc/src/main/groovy/org/elasticsearch/gradle/BuildPlugin.groovy
+++ b/buildSrc/src/main/groovy/org/elasticsearch/gradle/BuildPlugin.groovy
@@ -19,12 +19,14 @@
 package org.elasticsearch.gradle
 
 import org.elasticsearch.gradle.precommit.PrecommitTasks
+import org.gradle.api.GradleException
 import org.gradle.api.JavaVersion
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.Task
 import org.gradle.api.tasks.bundling.Jar
 import org.gradle.api.tasks.compile.JavaCompile
+import org.gradle.util.VersionNumber
 
 /**
  * Encapsulates build configuration for elasticsearch projects.
@@ -33,6 +35,7 @@ class BuildPlugin implements Plugin<Project> {
 
     @Override
     void apply(Project project) {
+        globalBuildInfo(project)
         project.pluginManager.apply('java')
         project.pluginManager.apply('carrotsearch.randomizedtesting')
         // these plugins add lots of info to our jars
@@ -48,6 +51,25 @@ class BuildPlugin implements Plugin<Project> {
         PrecommitTasks.configure(project)
     }
 
+    static void globalBuildInfo(Project project) {
+        if (project.rootProject.ext.has('buildChecksDone') == false) {
+            // enforce gradle version
+            VersionNumber gradleVersion = VersionNumber.parse(project.gradle.gradleVersion)
+            if (gradleVersion.major < 2 || gradleVersion.major == 2 && gradleVersion.minor < 6) {
+                throw new GradleException('Gradle 2.6 or above is required to build elasticsearch')
+            }
+
+            // Build debugging info
+            println '======================================='
+            println 'Elasticsearch Build Hamster says Hello!'
+            println '======================================='
+            println "  Gradle Version : ${project.gradle.gradleVersion}"
+            println "  JDK Version    : ${System.getProperty('java.runtime.version')} (${System.getProperty('java.vendor')})"
+            println "  OS Info        : ${System.getProperty('os.name')} ${System.getProperty('os.version')} (${System.getProperty('os.arch')})"
+            project.rootProject.ext.buildChecksDone = true
+        }
+    }
+
     /** Adds compiler settings to the project */
     static void configureCompile(Project project) {
         project.afterEvaluate {