Comment 13 for bug 495000

So it looks like the issue is that NoSuchFile is getting propagated all the way to the top, rather than getting caught by _DirectPackAccess.get_raw_records() and being translated into: errors.RetryWithNewPacks.
And I'm guessing that is the case because:
                if self._reload_func is None:
                    raise

Which means that _DirectPackAccess isn't getting the reload function that _do_autopack is passing down. I think part of the reason for that is because of how we changed the packer code functionality in the 2.0 switchover. Namely it now goes via the get_record_stream() abstraction. Which does have its own retry functionality, but expects self._reload_func to be set before it raises RestartWithNewPacks.

Still investigating.