From 48bf1415896db0f890530dcd182f33c2f0df10a8 Mon Sep 17 00:00:00 2001
From: "brian m. carlson" <sandals@crustytoothpaste.net>
Date: Mon, 25 May 2020 19:58:59 +0000
Subject: fetch-pack: detect when the server doesn't support our hash

Detect when the server doesn't support our hash algorithm and abort.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/fetch-pack.c b/fetch-pack.c
index f73a2ce..1d27719 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -1039,6 +1039,8 @@ static struct ref *do_fetch_pack(struct fetch_pack_args *args,
 		print_verbose(args, _("Server supports %s"), "deepen-relative");
 	else if (args->deepen_relative)
 		die(_("Server does not support --deepen"));
+	if (!server_supports_hash(the_hash_algo->name, NULL))
+		die(_("Server does not support this repository's object format"));
 
 	if (!args->no_dependents) {
 		mark_complete_and_common_ref(negotiator, args, &ref);
-- 
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