clone: respect remote unborn HEAD

Teach Git to use the "unborn" feature introduced in a previous patch as
follows: Git will always send the "unborn" argument if it is supported
by the server. During "git clone", if cloning an empty repository, Git
will use the new information to determine the local branch to create. In
all other cases, Git will ignore it.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/transport.h b/transport.h
index 1f5b60e4d3..24e15799e7 100644
--- a/transport.h
+++ b/transport.h
@@ -243,6 +243,14 @@ struct transport_ls_refs_options {
 	 * provided ref_prefixes.
 	 */
 	struct strvec ref_prefixes;
+
+	/*
+	 * If unborn_head_target is not NULL, and the remote reports HEAD as
+	 * pointing to an unborn branch, transport_get_remote_refs() stores the
+	 * unborn branch in unborn_head_target. It should be freed by the
+	 * caller.
+	 */
+	char *unborn_head_target;
 };
 #define TRANSPORT_LS_REFS_OPTIONS_INIT { STRVEC_INIT }