--progress option for git submodule update?

Hi,

Git submodule doesn’t have a --progress option like regular clone/fetch does. This means that it can hang a long time without output as it’s transferring data, particularly for large repositories. This is problematic in automation scenarios where there can be upper-bounds on how long a process may run without any output (to protect against processes hanging for long periods of time without forward progress).

I’m sure this has been asked for before but having this option would be really nice for automation system (like buildbot) to take advantage of. The only alternative is a hacky solution to clone locally first with the —progress option & then somehow set up the submodule to use the local clone as a reference.

Thanks, Vitali