3 files changed, 37 insertions, 0 deletions
diff --git a/include/git2/push.h b/include/git2/push.h
index ecabff397..3f850453d 100644
--- a/include/git2/push.h
+++ b/include/git2/push.h
@@ -59,6 +59,36 @@ typedef int (*git_push_transfer_progress)(
 	size_t bytes,
 	void* payload);
 
+/**
+ * Represents an update which will be performed on the remote during push
+ */
+typedef struct {
+	/**
+	 * The source name of the reference
+	 */
+	char *src_refname;
+	/**
+	 * The name of the reference to update on the server
+	 */
+	char *dst_refname;
+	/**
+	 * The current target of the reference
+	 */
+	git_oid src;
+	/**
+	 * The new target for the reference
+	 */
+	git_oid dst;
+} git_push_update;
+
+/**
+ * @param updates an array containing the updates which will be sent
+ * as commands to the destination.
+ * @param len number of elements in `updates`
+ * @param payload Payload provided by the caller
+ */
+typedef int (*git_push_negotiation)(const git_push_update **updates, size_t len, void *payload);
+
 /** @} */
 GIT_END_DECL
 #endif
diff --git a/include/git2/remote.h b/include/git2/remote.h
index f85c38429..6e88a4680 100644
--- a/include/git2/remote.h
+++ b/include/git2/remote.h
@@ -521,6 +521,12 @@ struct git_remote_callbacks {
 	int (*push_update_reference)(const char *refname, const char *status, void *data);
 
 	/**
+	 * Called once between the negotiation step and the upload. It
+	 * provides information about what updates will be performed.
+	 */
+	git_push_negotiation push_negotiation;
+
+	/**
 	 * This will be passed to each of the callbacks in this struct
 	 * as the last parameter.
 	 */
diff --git a/include/git2/types.h b/include/git2/types.h
index c90ac4776..fdb5f2b09 100644
--- a/include/git2/types.h
+++ b/include/git2/types.h
@@ -273,6 +273,7 @@ typedef int (*git_transfer_progress_cb)(const git_transfer_progress *stats, void
  */
 typedef int (*git_transport_message_cb)(const char *str, int len, void *payload);
 
+
 /**
  * Type of host certificate structure that is passed to the check callback
  */