path: root/builtin/fetch-pack.c
diff options
authorJeff King <>2012-08-10 07:57:43 (GMT)
committerJunio C Hamano <>2012-08-10 19:35:13 (GMT)
commitd50c3871632451b0cac066eea178198ac8a9dff1 (patch)
treefd9ff70aeef269e251c193ca899cf6bb11f33352 /builtin/fetch-pack.c
parentca8e127c9bd65b07a565ca00aff8e0a48628bfc3 (diff)
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 <> Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'builtin/fetch-pack.c')
1 files changed, 6 insertions, 1 deletions
diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c
index fe56596..bc7a0f9 100644
--- a/builtin/fetch-pack.c
+++ b/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);
} 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)) {
goto all_done;