[PATCH 3/6 (v2)] connect.c::read_extra_info(): find where HEAD points at

[Junio C Hamano <gitster@pobox.com>]

This actually implements the protocol extension to receive the HEAD symref
information that is hidden after the server capabilities list.  Nobody
uses the information yet, though.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 connect.c |   27 +++++++++++++++++++++++++--
 1 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/connect.c b/connect.c
index 114d691..aa4757a 100644
--- a/connect.c
+++ b/connect.c
@@ -53,7 +53,7 @@ static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1
  * NUL".  "len" is the remaining number of bytes.  The caller knows
  * that the original packet contains more information than that.
  */
-static void read_extra_info(char *line, int len)
+static void read_extra_info(char *line, int len, char **hpa)
 {
 	/*
 	 * The first such "extra" piece of information is the list of
@@ -64,6 +64,20 @@ static void read_extra_info(char *line, int len)
 	free(server_capabilities);
 	server_capabilities = xmalloc(infolen);
 	memcpy(server_capabilities, line, infolen);
+	if (infolen == len)
+		return;
+	/*
+	 * The uploader can optionally tell us where the HEAD pointer
+	 * points at after that.
+	 */
+	line += infolen;
+	len -= infolen;
+
+	infolen = strlen(line) + 1;
+
+	free(*hpa);
+	*hpa = xmalloc(infolen);
+	memcpy(*hpa, line, infolen);
 }
 
 /*
@@ -74,6 +88,9 @@ struct ref **get_remote_heads(int in, struct ref **list,
 			      unsigned int flags,
 			      struct extra_have_objects *extra_have)
 {
+	struct ref **ref_list = list;
+	char *head_points_at = NULL;
+
 	*list = NULL;
 	for (;;) {
 		struct ref *ref;
@@ -97,7 +114,8 @@ struct ref **get_remote_heads(int in, struct ref **list,
 
 		name_len = strlen(name);
 		if (len != name_len + 41)
-			read_extra_info(name + name_len + 1, len - (name_len + 41));
+			read_extra_info(name + name_len + 1, len - (name_len + 41),
+					&head_points_at);
 
 		if (extra_have &&
 		    name_len == 5 && !memcmp(".have", name, 5)) {
@@ -114,6 +132,11 @@ struct ref **get_remote_heads(int in, struct ref **list,
 		*list = ref;
 		list = &ref->next;
 	}
+	if (head_points_at) {
+		struct ref *head = find_ref_by_name(*ref_list, "HEAD");
+		if (head)
+			head->symref = head_points_at;
+	}
 	return list;
 }
 
-- 
1.6.0.4.864.g0f47a