Recursively set Gradle task dependency.

TaskUtil.groovy

class TaskUtil {
    static def recursivelyApplyToTaskDependencies(Task parent, Closure closure) {
        closure(parent)

        parent.dependsOn.findAll { dependency ->
            dependency instanceof Task
        }.each { task ->
            recursivelyApplyToTaskDependencies(task, closure)
        }
    }

    static def recursivelyAddTaskDependency(Task parent, Task dependency) {
        recursivelyApplyToTaskDependencies(parent) { p ->
            if (!p.name.equals(dependency.name)) {
                p.dependsOn(dependency)
            }
        }
    }
}