Example:

SRC_URI += "file://src;subdir=${S}"

A file at src/foo/bar/baz is recognized just fine. But then a directory change to something like src/foo/bar2/baz is not recognized and does not invalidate any tasks in subsequent builds.

Use case is a recipe that has a fair bit of metadata that is not even remotely amenable to the typical flat layout expected of a set of patches.

..Ch:W..

P.S. I attempted to do this with an event handler that was run when bb.event.RecipePreFinalise is is fired. It would compare directory trees and set do_fetch[nostamp] = "1" to invalidate the fetcher task. But I got really spotty behavior. It seems like event handlers are cached like tasks.