Watcher does not detect (re)moving a parent directory about directory-watcher HOT 2 OPEN

That's interesting. It's possible the Java WatchService is not firing any events in that case, because the event occurred on the parent and not on the watched directories.

Which operating systems have you tried on?

I definitely think we need more clear and consistent behavior when roots and parents of roots get deleted.

from directory-watcher.

I've tested it on Windows and macos, and there's a bit different behaviour.
Initial condition: start watcher on some parentDir/watchedDir

Delete watchedDir

• Mac: deletion is detected and the watcher exists
• Win: deletion is not detected, watcher runs

Delete parentDir/watchedDir

• Mac: deletion is not detected, watcher runs
• Win: deletion is not detected, watcher runs

So, looks like macos's native library detects when the path is gone, and win's doesn't.
I don't know the implementation details in depths but probably a simple periodical check that the watching path is still resolved should be sufficient.

from directory-watcher.