Comment 20 for bug 915618

1) Definitely no

2) This would be my selection Not sure what problem you were seeing when handing it the callback. udev and dbus use this interface now.This should happen very infrequently, within a transaction.

3) setlinux_set_callback is the correct callback

4) Doing it internally would be problematic, I guess we could return an error if the file_context file changed, but that could be costly.