Re: [PATCH v3 0/3] packfile URIs: support concurrent downloads

> I can't think of a synchronization point we could use here. We're
> waiting on curl to have passed the bytes to fwrite() and for it to have
> actually synced to disk. We either have to poll or modify http.c to
> write "yes, we got some bytes!" to a fifo. Both are pretty gross.
>
> I wonder if we could just drop that "test -s" entirely. We'd _usually_
> see some bytes written before the second request starts. But it's OK if
> we don't. It just means the test is working in the reverse order (the
> second request may write its bytes first, and then the first one is the
> one "overwriting" it). I.e., the two are symmetric from our perspective.