[PATCH 04/10] receive-pack: advertise trace2 SID in v0 capabilities

[Josh Steadmon <steadmon@google.com>]

When trace2 is enabled and trace2.advertiseSID is true, advertise
receive-pack's trace2 session ID via the new trace2-sid capability.

Signed-off-by: Josh Steadmon <steadmon@google.com>
---
 builtin/receive-pack.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index bb9909c52e..1ff83c874b 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -29,6 +29,7 @@
 #include "commit-reach.h"
 #include "worktree.h"
 #include "shallow.h"
+#include "trace2/tr2_sid.h"
 
 static const char * const receive_pack_usage[] = {
 	N_("git receive-pack <git-dir>"),
@@ -54,6 +55,7 @@ static int receive_unpack_limit = -1;
 static int transfer_unpack_limit = -1;
 static int advertise_atomic_push = 1;
 static int advertise_push_options;
+static int advertise_trace2_sid;
 static int unpack_limit = 100;
 static off_t max_input_size;
 static int report_status;
@@ -248,6 +250,11 @@ static int receive_pack_config(const char *var, const char *value, void *cb)
 		return 0;
 	}
 
+	if (strcmp(var, "trace2.advertisesid") == 0) {
+		advertise_trace2_sid = git_config_bool(var, value);
+		return 0;
+	}
+
 	return git_default_config(var, value, cb);
 }
 
@@ -268,6 +275,8 @@ static void show_ref(const char *path, const struct object_id *oid)
 			strbuf_addf(&cap, " push-cert=%s", push_cert_nonce);
 		if (advertise_push_options)
 			strbuf_addstr(&cap, " push-options");
+		if (advertise_trace2_sid && trace2_is_enabled())
+			strbuf_addf(&cap, " trace2-sid=%s", tr2_sid_get());
 		strbuf_addf(&cap, " object-format=%s", the_hash_algo->name);
 		strbuf_addf(&cap, " agent=%s", git_user_agent_sanitized());
 		packet_write_fmt(1, "%s %s%c%s\n",
-- 
2.29.1.341.ge80a0c044ae-goog