do not send client agent unless server does first

Commit ff5effdf taught both clients and servers of the git protocol
to send an "agent" capability that just advertises their version for
statistics and debugging purposes.  The protocol-capabilities.txt
document however indicates that the client's advertisement is
actually a response, and should never include capabilities not
mentioned in the server's advertisement.

Adding the unconditional advertisement in the server programs was
OK, then, but the clients broke the protocol.  The server
implementation of git-core itself does not care, but at least one
does: the Google Code git server (or any server using Dulwich), will
hang up with an internal error upon seeing an unknown capability.

Instead, each client must record whether we saw an agent string from
the server, and respond with its agent only if the server mentioned
it first.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/fetch-pack.c

@@ -19,6 +19,7 @@ static int prefer_ofs_delta = 1;
 static int no_done;
 static int fetch_fsck_objects = -1;
 static int transfer_fsck_objects = -1;
+static int agent_supported;
 static struct fetch_pack_args args = {
 	/* .uploadpack = */ "git-upload-pack",
 };
@@ -328,7 +329,8 @@ static int find_common(int fd[2], unsigned char *result_sha1,
 			if (args.no_progress)   strbuf_addstr(&c, " no-progress");
 			if (args.include_tag)   strbuf_addstr(&c, " include-tag");
 			if (prefer_ofs_delta)   strbuf_addstr(&c, " ofs-delta");
-			strbuf_addf(&c, " agent=%s", git_user_agent_sanitized());
+			if (agent_supported)    strbuf_addf(&c, " agent=%s",
+							    git_user_agent_sanitized());
 			packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
 			strbuf_release(&c);
 		} else
@@ -821,6 +823,9 @@ static struct ref *do_fetch_pack(int fd[2],
 			fprintf(stderr, "Server supports ofs-delta\n");
 	} else
 		prefer_ofs_delta = 0;
+	if (server_supports("agent"))
+		agent_supported = 1;
+
 	if (everything_local(&ref, nr_match, match)) {
 		packet_flush(fd[1]);
 		goto all_done;

builtin/send-pack.c

@@ -252,6 +252,7 @@ int send_pack(struct send_pack_args *args,
 	int status_report = 0;
 	int use_sideband = 0;
 	int quiet_supported = 0;
+	int agent_supported = 0;
 	unsigned cmds_sent = 0;
 	int ret;
 	struct async demux;
@@ -267,6 +268,8 @@ int send_pack(struct send_pack_args *args,
 		use_sideband = 1;
 	if (server_supports("quiet"))
 		quiet_supported = 1;
+	if (server_supports("agent"))
+		agent_supported = 1;
 
 	if (!remote_refs) {
 		fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
@@ -306,14 +309,17 @@ int send_pack(struct send_pack_args *args,
 			char *new_hex = sha1_to_hex(ref->new_sha1);
 			int quiet = quiet_supported && (args->quiet || !args->progress);
 
-			if (!cmds_sent && (status_report || use_sideband || quiet)) {
+			if (!cmds_sent && (status_report || use_sideband ||
+					   quiet || agent_supported)) {
 				packet_buf_write(&req_buf,
-						 "%s %s %s%c%s%s%s agent=%s",
+						 "%s %s %s%c%s%s%s%s%s",
 						 old_hex, new_hex, ref->name, 0,
 						 status_report ? " report-status" : "",
 						 use_sideband ? " side-band-64k" : "",
 						 quiet ? " quiet" : "",
-						 git_user_agent_sanitized());
+						 agent_supported ? " agent=" : "",
+						 agent_supported ? git_user_agent_sanitized() : ""
+						);
 			}
 			else
 				packet_buf_write(&req_buf, "%s %s %s",