RelNotes: update the v0 with extension situation

[thirdparty/git.git] / serve.c

diff --git a/serve.c b/serve.c
index 317256c1a493c4b2cc730a6212add4d1ef5696d4..fbd2fcdfb52f7151e53bed7fdc182305bc015df2 100644 (file)
--- a/serve.c
+++ b/serve.c
@@ -22,6 +22,14 @@ static int agent_advertise(struct repository *r,
        return 1;
 }
 
+static int object_format_advertise(struct repository *r,
+                                  struct strbuf *value)
+{
+       if (value)
+               strbuf_addstr(value, r->hash_algo->name);
+       return 1;
+}
+
 struct protocol_capability {
        /*
         * The name of the capability.  The server uses this name when
@@ -57,6 +65,7 @@ static struct protocol_capability capabilities[] = {
        { "ls-refs", always_advertise, ls_refs },
        { "fetch", upload_pack_advertise, upload_pack_v2 },
        { "server-option", always_advertise, NULL },
+       { "object-format", object_format_advertise, NULL },
 };
 
 static void advertise_capabilities(void)
@@ -153,6 +162,22 @@ int has_capability(const struct argv_array *keys, const char *capability,
        return 0;
 }
 
+static void check_algorithm(struct repository *r, struct argv_array *keys)
+{
+       int client = GIT_HASH_SHA1, server = hash_algo_by_ptr(r->hash_algo);
+       const char *algo_name;
+
+       if (has_capability(keys, "object-format", &algo_name)) {
+               client = hash_algo_by_name(algo_name);
+               if (client == GIT_HASH_UNKNOWN)
+                       die("unknown object format '%s'", algo_name);
+       }
+
+       if (client != server)
+               die("mismatched object format: server %s; client %s\n",
+                   r->hash_algo->name, hash_algos[client].name);
+}
+
 enum request_state {
        PROCESS_REQUEST_KEYS,
        PROCESS_REQUEST_DONE,
@@ -217,12 +242,16 @@ static int process_request(void)
 
                        state = PROCESS_REQUEST_DONE;
                        break;
+               case PACKET_READ_RESPONSE_END:
+                       BUG("unexpected stateless separator packet");
                }
        }
 
        if (!command)
                die("no command requested");
 
+       check_algorithm(the_repository, &keys);
+
        command->command(the_repository, &keys, &reader);
 
        argv_array_clear(&keys);