[PATCH v3 06/11] serve: advertise session ID in v2 capabilities

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When transfer.advertiseSID is true, advertise the server's session ID
for all protocol v2 connections via the new session-id capability.

Signed-off-by: Josh Steadmon <steadmon@xxxxxxxxxx>
---
 serve.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/serve.c b/serve.c
index f6341206c4..8c0bb84f37 100644
--- a/serve.c
+++ b/serve.c
@@ -8,6 +8,8 @@
 #include "serve.h"
 #include "upload-pack.h"
 
+static int advertise_sid;
+
 static int always_advertise(struct repository *r,
 			    struct strbuf *value)
 {
@@ -30,6 +32,15 @@ static int object_format_advertise(struct repository *r,
 	return 1;
 }
 
+static int session_id_advertise(struct repository *r, struct strbuf *value)
+{
+	if (!advertise_sid)
+		return 0;
+	if (value)
+		strbuf_addstr(value, trace2_session_id());
+	return 1;
+}
+
 struct protocol_capability {
 	/*
 	 * The name of the capability.  The server uses this name when
@@ -66,6 +77,7 @@ static struct protocol_capability capabilities[] = {
 	{ "fetch", upload_pack_advertise, upload_pack_v2 },
 	{ "server-option", always_advertise, NULL },
 	{ "object-format", object_format_advertise, NULL },
+	{ "session-id", session_id_advertise, NULL },
 };
 
 static void advertise_capabilities(void)
@@ -261,6 +273,8 @@ static int process_request(void)
 /* Main serve loop for protocol version 2 */
 void serve(struct serve_options *options)
 {
+	git_config_get_bool("transfer.advertisesid", &advertise_sid);
+
 	if (options->advertise_capabilities || !options->stateless_rpc) {
 		/* serve by default supports v2 */
 		packet_write_fmt(1, "version 2\n");
-- 
2.29.2.222.g5d2a92d10f8-goog




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