Build: Add pom generation to assemble task

In preparation for a unified release process, we need to be able to
generate the pom files independently of trying to actually publish. This
change adds back the maven-publish plugin just for that purpose. The
nexus plugin still exists for now, so that we do not break snapshots,
but that can be removed at a later time once snapshots are happenign
through the unified tools. Note I also changed the dir jars are written
into so that all our artifacts are under build/distributions.

build.gradle

@@ -28,6 +28,26 @@ subprojects {
   group = 'org.elasticsearch'
   version = org.elasticsearch.gradle.VersionProperties.elasticsearch
 
+  // we only use maven publish to add tasks for pom generation
+  plugins.withType(MavenPublishPlugin).whenPluginAdded {
+    publishing {
+      publications {
+        // add license information to generated poms
+        all {
+          pom.withXml { XmlProvider xml ->
+            Node node = xml.asNode()
+            node.appendNode('inceptionYear', '2009')
+
+            Node license = node.appendNode('licenses').appendNode('license')
+            license.appendNode('name', 'The Apache Software License, Version 2.0')
+            license.appendNode('url', 'http://www.apache.org/licenses/LICENSE-2.0.txt')
+            license.appendNode('distribution', 'repo')
+          }
+        }
+      }
+    }
+  }
+
   plugins.withType(NexusPlugin).whenPluginAdded {
     modifyPom {
       project {

buildSrc/build.gradle

@@ -69,6 +69,7 @@ dependencies {
     transitive = false
   }
   compile 'com.netflix.nebula:gradle-extra-configurations-plugin:3.0.3'
+  compile 'com.netflix.nebula:nebula-publishing-plugin:4.4.4'
   compile 'com.netflix.nebula:gradle-info-plugin:3.0.3'
   compile 'org.eclipse.jgit:org.eclipse.jgit:3.2.0.201312181205-r'
   compile 'com.perforce:p4java:2012.3.551082' // THIS IS SUPPOSED TO BE OPTIONAL IN THE FUTURE....

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

@@ -33,6 +33,9 @@ import org.gradle.api.artifacts.ProjectDependency
 import org.gradle.api.artifacts.ResolvedArtifact
 import org.gradle.api.artifacts.dsl.RepositoryHandler
 import org.gradle.api.artifacts.maven.MavenPom
+import org.gradle.api.publish.maven.MavenPublication
+import org.gradle.api.publish.maven.plugins.MavenPublishPlugin
+import org.gradle.api.publish.maven.tasks.GenerateMavenPom
 import org.gradle.api.tasks.bundling.Jar
 import org.gradle.api.tasks.compile.JavaCompile
 import org.gradle.internal.jvm.Jvm
@@ -54,7 +57,7 @@ class BuildPlugin implements Plugin<Project> {
         project.pluginManager.apply('java')
         project.pluginManager.apply('carrotsearch.randomized-testing')
         // these plugins add lots of info to our jars
-        configureJarManifest(project) // jar config must be added before info broker
+        configureJars(project) // jar config must be added before info broker
         project.pluginManager.apply('nebula.info-broker')
         project.pluginManager.apply('nebula.info-basic')
         project.pluginManager.apply('nebula.info-java')
@@ -68,6 +71,7 @@ class BuildPlugin implements Plugin<Project> {
         configureConfigurations(project)
         project.ext.versions = VersionProperties.versions
         configureCompile(project)
+        configurePomGeneration(project)
 
         configureTest(project)
         configurePrecommit(project)
@@ -266,44 +270,7 @@ class BuildPlugin implements Plugin<Project> {
 
         // add exclusions to the pom directly, for each of the transitive deps of this project's deps
         project.modifyPom { MavenPom pom ->
-            pom.withXml { XmlProvider xml ->
-                // first find if we have dependencies at all, and grab the node
-                NodeList depsNodes = xml.asNode().get('dependencies')
-                if (depsNodes.isEmpty()) {
-                    return
-                }
-
-                // check each dependency for any transitive deps
-                for (Node depNode : depsNodes.get(0).children()) {
-                    String groupId = depNode.get('groupId').get(0).text()
-                    String artifactId = depNode.get('artifactId').get(0).text()
-                    String version = depNode.get('version').get(0).text()
-
-                    // collect the transitive deps now that we know what this dependency is
-                    String depConfig = transitiveDepConfigName(groupId, artifactId, version)
-                    Configuration configuration = project.configurations.findByName(depConfig)
-                    if (configuration == null) {
-                        continue // we did not make this dep non-transitive
-                    }
-                    Set<ResolvedArtifact> artifacts = configuration.resolvedConfiguration.resolvedArtifacts
-                    if (artifacts.size() <= 1) {
-                        // this dep has no transitive deps (or the only artifact is itself)
-                        continue
-                    }
-
-                    // we now know we have something to exclude, so add the exclusion elements
-                    Node exclusions = depNode.appendNode('exclusions')
-                    for (ResolvedArtifact transitiveArtifact : artifacts) {
-                        ModuleVersionIdentifier transitiveDep = transitiveArtifact.moduleVersion.id
-                        if (transitiveDep.group == groupId && transitiveDep.name == artifactId) {
-                            continue; // don't exclude the dependency itself!
-                        }
-                        Node exclusion = exclusions.appendNode('exclusion')
-                        exclusion.appendNode('groupId', transitiveDep.group)
-                        exclusion.appendNode('artifactId', transitiveDep.name)
-                    }
-                }
-            }
+            pom.withXml(removeTransitiveDependencies(project))
         }
     }
 
@@ -332,6 +299,70 @@ class BuildPlugin implements Plugin<Project> {
         }
     }
 
+    /** Returns a closure which can be used with a MavenPom for removing transitive dependencies. */
+    private static Closure removeTransitiveDependencies(Project project) {
+        // TODO: remove this when enforcing gradle 2.13+, it now properly handles exclusions
+        return { XmlProvider xml ->
+            // first find if we have dependencies at all, and grab the node
+            NodeList depsNodes = xml.asNode().get('dependencies')
+            if (depsNodes.isEmpty()) {
+                return
+            }
+
+            // check each dependency for any transitive deps
+            for (Node depNode : depsNodes.get(0).children()) {
+                String groupId = depNode.get('groupId').get(0).text()
+                String artifactId = depNode.get('artifactId').get(0).text()
+                String version = depNode.get('version').get(0).text()
+
+                // collect the transitive deps now that we know what this dependency is
+                String depConfig = transitiveDepConfigName(groupId, artifactId, version)
+                Configuration configuration = project.configurations.findByName(depConfig)
+                if (configuration == null) {
+                    continue // we did not make this dep non-transitive
+                }
+                Set<ResolvedArtifact> artifacts = configuration.resolvedConfiguration.resolvedArtifacts
+                if (artifacts.size() <= 1) {
+                    // this dep has no transitive deps (or the only artifact is itself)
+                    continue
+                }
+
+                // we now know we have something to exclude, so add the exclusion elements
+                Node exclusions = depNode.appendNode('exclusions')
+                for (ResolvedArtifact transitiveArtifact : artifacts) {
+                    ModuleVersionIdentifier transitiveDep = transitiveArtifact.moduleVersion.id
+                    if (transitiveDep.group == groupId && transitiveDep.name == artifactId) {
+                        continue; // don't exclude the dependency itself!
+                    }
+                    Node exclusion = exclusions.appendNode('exclusion')
+                    exclusion.appendNode('groupId', transitiveDep.group)
+                    exclusion.appendNode('artifactId', transitiveDep.name)
+                }
+            }
+        }
+    }
+
+    /**Configuration generation of maven poms. */
+    private static void configurePomGeneration(Project project) {
+        project.plugins.withType(MavenPublishPlugin.class).whenPluginAdded {
+            project.publishing {
+                publications {
+                    all { MavenPublication publication -> // we only deal with maven
+                        // add exclusions to the pom directly, for each of the transitive deps of this project's deps
+                        publication.pom.withXml(removeTransitiveDependencies(project))
+                    }
+                }
+            }
+
+            project.tasks.withType(GenerateMavenPom.class) { GenerateMavenPom t ->
+                // place the pom next to the jar it is for
+                t.destination = new File(project.buildDir, "distributions/${project.archivesBaseName}-${project.version}.pom")
+                // build poms with assemble
+                project.assemble.dependsOn(t)
+            }
+        }
+    }
+
     /** Adds compiler settings to the project */
     static void configureCompile(Project project) {
         project.ext.compactProfile = 'compact3'
@@ -364,9 +395,12 @@ class BuildPlugin implements Plugin<Project> {
         }
     }
 
-    /** Adds additional manifest info to jars */
-    static void configureJarManifest(Project project) {
+    /** Adds additional manifest info to jars, and adds source and javadoc jars */
+    static void configureJars(Project project) {
         project.tasks.withType(Jar) { Jar jarTask ->
+            // we put all our distributable files under distributions
+            jarTask.destinationDir = new File(project.buildDir, 'distributions')
+            // fixup the jar manifest
             jarTask.doFirst {
                 boolean isSnapshot = VersionProperties.elasticsearch.endsWith("-SNAPSHOT");
                 String version = VersionProperties.elasticsearch;

buildSrc/src/main/groovy/org/elasticsearch/gradle/plugin/PluginBuildPlugin.groovy

@@ -18,11 +18,12 @@
  */
 package org.elasticsearch.gradle.plugin
 
+import nebula.plugin.publishing.maven.MavenManifestPlugin
+import nebula.plugin.publishing.maven.MavenScmPlugin
 import org.elasticsearch.gradle.BuildPlugin
 import org.elasticsearch.gradle.test.RestIntegTestTask
 import org.elasticsearch.gradle.test.RunTask
 import org.gradle.api.Project
-import org.gradle.api.artifacts.Dependency
 import org.gradle.api.tasks.SourceSet
 import org.gradle.api.tasks.bundling.Zip
 
@@ -50,6 +51,7 @@ public class PluginBuildPlugin extends BuildPlugin {
             } else {
                 project.integTest.clusterConfig.plugin(name, project.bundlePlugin.outputs.files)
                 project.tasks.run.clusterConfig.plugin(name, project.bundlePlugin.outputs.files)
+                configurePomGeneration(project)
             }
 
             project.namingConventions {
@@ -125,4 +127,32 @@ public class PluginBuildPlugin extends BuildPlugin {
         project.configurations.getByName('default').extendsFrom = []
         project.artifacts.add('default', bundle)
     }
+
+    /**
+     * Adds the plugin jar and zip as publications.
+     */
+    private static void configurePomGeneration(Project project) {
+        project.plugins.apply(MavenScmPlugin.class)
+        project.plugins.apply(MavenManifestPlugin.class)
+
+        project.publishing {
+            publications {
+                nebula {
+                    artifact project.bundlePlugin
+                    pom.withXml {
+                        // overwrite the name/description in the pom nebula set up
+                        Node root = asNode()
+                        for (Node node : root.children()) {
+                            if (node.name() == 'name') {
+                                node.setValue(project.pluginProperties.extension.name)
+                            } else if (node.name() == 'description') {
+                                node.setValue(project.pluginProperties.extension.description)
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+    }
 }

core/build.gradle

@@ -24,6 +24,18 @@ import org.elasticsearch.gradle.BuildPlugin
 apply plugin: 'elasticsearch.build'
 apply plugin: 'com.bmuschko.nexus'
 apply plugin: 'nebula.optional-base'
+apply plugin: 'nebula.maven-base-publish'
+apply plugin: 'nebula.maven-scm'
+//apply plugin: 'nebula.source-jar'
+//apply plugin: 'nebula.javadoc-jar'
+
+publishing {
+  publications {
+    nebula {
+      artifactId 'elasticsearch'
+    }
+  }
+}
 
 archivesBaseName = 'elasticsearch'
 

distribution/build.gradle

@@ -158,6 +158,19 @@ subprojects {
       MavenFilteringHack.filter(it, expansions)
     }
   }
+
+   /*****************************************************************************
+   *                           Publishing setup                                *
+   *****************************************************************************/
+  apply plugin: 'nebula.maven-base-publish'
+  apply plugin: 'nebula.maven-scm'
+  publishing {
+    publications {
+      nebula {
+        artifactId 'elasticsearch'
+      }
+    }
+  }
 }
 
 /*****************************************************************************

distribution/integ-test-zip/build.gradle

@@ -27,5 +27,13 @@ artifacts {
   archives buildZip
 }
 
+publishing {
+  publications {
+    nebula {
+      artifact buildZip
+    }
+  }
+}
+
 integTest.dependsOn buildZip
 

distribution/tar/build.gradle

@@ -33,3 +33,4 @@ artifacts {
     project.signArchives.singleSignature.type = 'tar.gz.asc'
   }
 }
+

distribution/zip/build.gradle

@@ -27,5 +27,13 @@ artifacts {
   archives buildZip
 }
 
+publishing {
+  publications {
+    nebula {
+      artifact buildZip
+    }
+  }
+}
+
 integTest.dependsOn buildZip
 

test/build.gradle

@@ -25,6 +25,8 @@ subprojects {
 
   group = 'org.elasticsearch.test'
   apply plugin: 'elasticsearch.build'
+  apply plugin: 'nebula.maven-base-publish'
+  apply plugin: 'nebula.maven-scm'
 
 
   // the main files are actually test files, so use the appropriate forbidden api sigs