Unable to watch directory changes via \\wsl$\ redirector

[throwable-one]

It seems that FindFirstChangeNotification doesn't work

#include <Windows.h>
#include <stdio.h>

int main()
{
	const WCHAR dir[] = L"\\\\wsl$\\Ubuntu-18.04\\"; // Failed to monitor changes: 1
	const int dw_notify_filter = FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_ACTION_MODIFIED |
		FILE_ACTION_ADDED | FILE_ACTION_REMOVED;
	const HANDLE change_handle = FindFirstChangeNotification(dir,
	                                                         TRUE,
	                                                         dw_notify_filter);

	if (change_handle == INVALID_HANDLE_VALUE)
	{
		const DWORD err = GetLastError();
		printf("Failed to monitor changes %ld", err);
		return -1;
	}
	printf("OK");
	return 0;
}

[throwable-one]

.NET filewatcher accepts this path but never returns anything

    internal class MyClass
    {
        public static void Main(string[] args)
        {
           var w =  new FileSystemWatcher("\\\\wsl$\\Ubuntu-18.04\\");
           w.WaitForChanged(WatcherChangeTypes.All);
           Console.Write("Changed!");
        }
    }

[therealkenc]

This is related to #4064 (#4224, #4169 et al). #4064 issue has a coveted bug tag, but won't dupe you because I am pretty sure Code watches from the other side not Windows (can't swear to that).

If you look at the FileFirstChangeNotification docs the scenario is supported by SMB3. But not WSL's 9p. Be mildly interesting to set up a Samba share on the Linux side and see if it takes.

Thanks for the excellent submission.

[vasekboch]

This one is crucial, when I use for example Jetbrains PHPStorm, that caches directory structure. And I update something in WSL2 (dependencies or git checkout). The PHPStorm relies on file notify to trigger cache invalidation.

[microsoft-github-policy-service]

This issue has been automatically closed since it has not had any activity for the past year. If you're still experiencing this issue please re-file this as a new issue or feature request.

Thank you!