Currently, if any server options are specified during a protocol v2
fetch, server options will be sent before "command=fetch". Write server
options to the request buffer in send_fetch_request() so that the
components of the request are sent in the correct order.

The protocol documentation states that the command must come first. The
Git server implementation in serve.c (see process_request() in that
file) tolerates any order of command and capability, which is perhaps
why we haven't noticed this. This was noticed when testing against a
JGit server implementation, which follows the documentation in this
regard.

Signed-off-by: Jonathan Tan <jonathanta...@google.com>
---
 fetch-pack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fetch-pack.c b/fetch-pack.c
index 3f24d0c8a6..1c10f54e78 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -1115,7 +1115,7 @@ static int send_fetch_request(struct fetch_negotiator 
*negotiator, int fd_out,
            server_supports_v2("server-option", 1)) {
                int i;
                for (i = 0; i < args->server_options->nr; i++)
-                       packet_write_fmt(fd_out, "server-option=%s",
+                       packet_buf_write(&req_buf, "server-option=%s",
                                         args->server_options->items[i].string);
        }
 
-- 
2.21.0.1020.gf2820cf01a-goog

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