[PATCH v3 2/3] transfer.advertiseObjectInfo: add object-info config

[Calvin Wan <calvinwan@google.com>]

Currently, object-info is always advertised by the server. Add a
config option to optionally advertise it. A subsequent patch uses this
option for testing.

---
 Documentation/config/transfer.txt |  4 ++++
 protocol-caps.c                   | 11 +++++++++++
 protocol-caps.h                   |  6 ++++++
 serve.c                           |  2 +-
 4 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/Documentation/config/transfer.txt b/Documentation/config/transfer.txt
index b49429eb4d..14892a3155 100644
--- a/Documentation/config/transfer.txt
+++ b/Documentation/config/transfer.txt
@@ -77,3 +77,7 @@ transfer.unpackLimit::
 transfer.advertiseSID::
 	Boolean. When true, client and server processes will advertise their
 	unique session IDs to their remote counterpart. Defaults to false.
+
+transfer.advertiseObjectInfo::
+	Boolean. When true or not set, server processes will advertise its
+	ability to accept `object-info` command requests
\ No newline at end of file
diff --git a/protocol-caps.c b/protocol-caps.c
index bbde91810a..f290e3cca2 100644
--- a/protocol-caps.c
+++ b/protocol-caps.c
@@ -8,6 +8,9 @@
 #include "object-store.h"
 #include "string-list.h"
 #include "strbuf.h"
+#include "config.h"
+
+static int advertise_object_info = -1;
 
 struct requested_info {
 	unsigned size : 1;
@@ -111,3 +114,11 @@ int cap_object_info(struct repository *r, struct packet_reader *request)
 
 	return 0;
 }
+
+int object_info_advertise(struct repository *r, struct strbuf *value)
+{
+	if (advertise_object_info == -1 &&
+		git_config_get_bool("transfer.advertiseObjectInfo", &advertise_object_info))
+		advertise_object_info = 0;
+	return advertise_object_info;
+}
diff --git a/protocol-caps.h b/protocol-caps.h
index 15c4550360..36f7a46b37 100644
--- a/protocol-caps.h
+++ b/protocol-caps.h
@@ -5,4 +5,10 @@ struct repository;
 struct packet_reader;
 int cap_object_info(struct repository *r, struct packet_reader *request);
 
+/*
+ * Advertises object-info capability if "objectinfo.advertise" is either
+ * set to true or not set
+ */
+int object_info_advertise(struct repository *r, struct strbuf *value);
+
 #endif /* PROTOCOL_CAPS_H */
diff --git a/serve.c b/serve.c
index b3fe9b5126..fb4ad367a7 100644
--- a/serve.c
+++ b/serve.c
@@ -133,7 +133,7 @@ static struct protocol_capability capabilities[] = {
 	},
 	{
 		.name = "object-info",
-		.advertise = always_advertise,
+		.advertise = object_info_advertise,
 		.command = cap_object_info,
 	},
 };
-- 
2.33.0.664.g0785eb7698