Path to project on which Gradle task is executed - gradle

Question

I have parent and child project. Parent's build.gradle is empty, settings.xml contains include 'child' and
in build.gradle of child I have a task
task('executionPath') << {
println projectDir
}
This task is supposed to print the path to project on which the build was started.
If I invoke it in root by ./gradlew executionPath I expect it to show path of the root project, e.g. C:\projects\parent.
If I invoke it in root by ./gradlew child:executionPath I expect it to show path of the child project, e.g. C:\projects\parent\child.
I've tried the following:
projectDir always path to child
new File('.') always path to parent
System.getProperty("user.dir") always path to parent
Answer Gradle: get folder from which "gradle" was executed is not helpful in my case. How can I achieve the above?

Answer 1

It's not very straightforward solution, but you can use start parameters to find out, whether the task was called for the root project or for the current. Something like this:
task('executionPath') << {
//find the argument representing current task
String calledTaskName = null;
for (String taskArgument : project.getGradle().startParameter.taskRequests.get(0).args) {
if (taskArgument.equals(name) || taskArgument.endsWith(':'+name)) {
calledTaskName = taskArgument;
}
}
if (calledTaskName == null) {
println 'Task was not called via arguments'
return;
}
//check, whether task was called on root project or for subproject only
if (calledTaskName.startsWith(project.getPath())) {
println projectDir
} else {
println System.getProperty("user.dir")
}
}
This task is looking within start parameters for the current task name. If it was called via start parameters, it checks, whether task name contains current project name as a prefix and according to it prints out current project path or root project path.
Unfortunately, I don't know any other solution for your case. Sure, you may need to modify it for your exact purposes.