[PATCH 1/3] upload-pack: send the HEAD information

[Andreas Krey <a.krey@gmx.de>]

From: Junio C Hamano <gitster@pobox.com>

This implements the server side of protocol extension to show which branch
the HEAD points at.  The information is sent as a capability symref=<target>.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Andreas Krey <a.krey@gmx.de>
---
 upload-pack.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/upload-pack.c b/upload-pack.c
index 127e59a..390d1ec 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -745,13 +745,17 @@ static int send_ref(const char *refname, const unsigned char *sha1, int flag, vo
 	if (mark_our_ref(refname, sha1, flag, cb_data))
 		return 0;
 
-	if (capabilities)
-		packet_write(1, "%s %s%c%s%s%s agent=%s\n",
+	if (capabilities) {
+		unsigned char dummy[20];
+		const char *target = resolve_ref_unsafe("HEAD", dummy, 0, NULL);
+		packet_write(1, "%s %s%c%s%s%s%s%s agent=%s\n",
 			     sha1_to_hex(sha1), refname_nons,
 			     0, capabilities,
 			     allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 			     stateless_rpc ? " no-done" : "",
+			     target ? " symref=" : "", target ? target : 0,
 			     git_user_agent_sanitized());
+	}
 	else
 		packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 	capabilities = NULL;
-- 
1.8.3.1.485.g9704416.dirty