In send_fetch_request(), "object-format" is written directly to the file descriptor, as opposed to the other arguments, which are buffered. Buffer "object-format" as well. "object-format" must be buffered; in particular, it must appear after "command=fetch" in the request. This divergence was introduced in 4b831208bb ("fetch-pack: parse and advertise the object-format capability", 2020-05-27), perhaps as an oversight (the surrounding code at the point of this commit has already been using a request buffer.) Signed-off-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx> --- fetch-pack.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fetch-pack.c b/fetch-pack.c index 6e68276aa3..2318ebe680 100644 --- a/fetch-pack.c +++ b/fetch-pack.c @@ -1251,7 +1251,7 @@ static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out, if (hash_algo_by_ptr(the_hash_algo) != hash_algo) die(_("mismatched algorithms: client %s; server %s"), the_hash_algo->name, hash_name); - packet_write_fmt(fd_out, "object-format=%s", the_hash_algo->name); + packet_buf_write(&req_buf, "object-format=%s", the_hash_algo->name); } else if (hash_algo_by_ptr(the_hash_algo) != GIT_HASH_SHA1) { die(_("the server does not support algorithm '%s'"), the_hash_algo->name); -- 2.31.1.295.g9ea45b61b8-goog