Merge branch 'jk/fetch-pack-v2-half-close-early'

"git fetch" over protocol v2 left its side of the socket open after
it finished speaking, which unnecessarily wasted the resource on
the other side.

* jk/fetch-pack-v2-half-close-early:
  fetch-pack: signal v2 server that we are done making requests

Author: gitster

fetch-pack.c

@@ -1645,6 +1645,15 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
 			if (process_section_header(&reader, "packfile-uris", 1))
 				receive_packfile_uris(&reader, &packfile_uris);
 			process_section_header(&reader, "packfile", 0);
+
+			/*
+			 * this is the final request we'll make of the server;
+			 * do a half-duplex shutdown to indicate that they can
+			 * hang up as soon as the pack is sent.
+			 */
+			close(fd[1]);
+			fd[1] = -1;
+
 			if (get_pack(args, fd, pack_lockfiles,
 				     packfile_uris.nr ? &index_pack_args : NULL,
 				     sought, nr_sought, &fsck_options.gitmodules_found))

transport.c

@@ -427,7 +427,8 @@ static int fetch_refs_via_pack(struct transport *transport,
 
 cleanup:
 	close(data->fd[0]);
-	close(data->fd[1]);
+	if (data->fd[1] >= 0)
+		close(data->fd[1]);
 	if (finish_connect(data->conn))
 		ret = -1;
 	data->conn = NULL;
@@ -869,7 +870,8 @@ static int disconnect_git(struct transport *transport)
 		if (data->got_remote_heads && !transport->stateless_rpc)
 			packet_flush(data->fd[1]);
 		close(data->fd[0]);
-		close(data->fd[1]);
+		if (data->fd[1] >= 0)
+			close(data->fd[1]);
 		finish_connect(data->conn);
 	}