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Injecting ProjectLayout

That was the right answer, thanks @CristianGM

abstract class AddTask @Inject constructor(
    @get:Input val projectLayout: ProjectLayout
) : DefaultTask() {

Just in case you are curious about the actual error. You tried to access

rootdir

from the script object, so the

AddTask

class got automatically a parameter to receive a reference to the enclosing object. And then Gradle couldn't instantiate it and suggested to annotate it with

@Inject

which actually wouldn't have helped in that situation. By using the injected project layout you do no longer reference the enclosing object and so no extra parameter is added to the constructor.

Thanks for the explanation @Vampire

But projectLayout has access to to root dir?

Or in other words, no 😄

Then @jmfayard can be having issues if he wants the root dir, so the only way is passing it from outsite the task, right?

In his question he said he wants to access

projectDir

or

file("xxx")

and for that

ProjectLayout

is perfectly fine. Just the code example used

rootDir

which of course is only the same if you are in the root project.

I have a single-project build, I don't really care

Thank you all 🙂

Fwiw, tasks all have a

getProject()

too, so:

tasks.register<AddTask>("add")

abstract class AddTask : DefaultTask() {
    @TaskAction fun test() = println(this.project.rootDir)
}

That break cache, right?

Configuration cache, yes

Yup: https://docs.gradle.org/current/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution