SSCCE finalizedBy Gradle 2.3 / 2.4

Gradle 2.3

apply plugin: MyPlugin
apply plugin: 'java'

//configure in the build script the publication
publishing {
	publications{
		ivy(IvyPublication){  organisation 'foo'		 }
	}
}

class MyPlugin implements Plugin<Project> {
	void apply(Project project) {
		//apply ivy publish plugin
		project.pluginManager.apply(IvyPublishPlugin)

		// add repo to project repos
		project.repositories { ivy { url "$project.projectDir/ivyRepo" } }

		//add all project repo to ivy publish repos
		project.repositories.all { repo ->
			if(repo instanceof IvyArtifactRepository){
				project.getExtensions().configure(PublishingExtension, new org.gradle.api.internal.ClosureBackedAction<PublishingExtension>({ repositories.add(repo) }))
			}
		}

		//create a custom task
		project.tasks.create('customTask', CustomTask)
	}

	@RuleSource
	static class Rule {
		@Finalize
		public void addFinalizeOnCustomTask(org.gradle.api.tasks.TaskContainer tasks){
			tasks.withType(CustomTask).each {myTask ->
				println myTask
				tasks.withType(org.gradle.api.publish.ivy.tasks.PublishToIvyRepository).each{
					println it
					myTask.finalizedBy it
				}
			}
		}
	}
}

class CustomTask extends org.gradle.api.DefaultTask{}

Gradle 2.4

apply plugin: MyPlugin
apply plugin: 'java'

//configure in the build script the publication
publishing {
	publications{
		ivy(IvyPublication){  organisation 'foo'		 }
	}
}

class MyPlugin implements Plugin<Project> {
	void apply(Project project) {
		//apply ivy publish plugin
		project.pluginManager.apply(IvyPublishPlugin)

		// add repo to project repos
		project.repositories { ivy { url "$project.projectDir/ivyRepo" } }

		//add all project repo to ivy publish repos
		project.repositories.all { repo ->
			if(repo instanceof IvyArtifactRepository){
				project.getExtensions().configure(PublishingExtension, new org.gradle.api.internal.ClosureBackedAction<PublishingExtension>({ repositories.add(repo) }))
			}
		}

		//create a custom task
		project.tasks.create('customTask', CustomTask)
	}

	static class Rule extends RuleSource{
		@Finalize
		public void addFinalizeOnCustomTask(org.gradle.api.tasks.TaskContainer tasks){
			tasks.withType(CustomTask).each {myTask ->
				println myTask
				tasks.withType(org.gradle.api.publish.ivy.tasks.PublishToIvyRepository).each{
					println it
					myTask.finalizedBy it
				}
			}
		}
	}
}

class CustomTask extends org.gradle.api.DefaultTask{}

output Gradle 2.3

C:\Francois\workspaceLuna\GradleConsumer>gradlew clean customTask
task ':customTask'
task ':publishIvyPublicationToIvyRepository'
:clean UP-TO-DATE
:customTask UP-TO-DATE
:generateDescriptorFileForIvyPublication
:publishIvyPublicationToIvyRepository

BUILD SUCCESSFUL

output Gradle 2.4

C:\Francois\workspaceLuna\GradleConsumer>gradlew clean customTask
task ':customTask'
:clean
:customTask UP-TO-DATE

BUILD SUCCESSFUL