Push code for transport library

This moves the code to call push backends into a library that can be
extended to make matching fetch and push decisions based on the URL it
gets, and which could be changed to have built-in implementations
instead of calling external programs.

Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/transport.h b/transport.h
new file mode 100644
index 0000000..5c2eb95
--- /dev/null
+++ b/transport.h
@@ -0,0 +1,61 @@
+#ifndef TRANSPORT_H
+#define TRANSPORT_H
+
+#include "cache.h"
+#include "remote.h"
+
+struct transport {
+	unsigned verbose : 1;
+	unsigned fetch : 1;
+	struct remote *remote;
+	const char *url;
+
+	void *data;
+
+	struct ref *remote_refs;
+
+	const struct transport_ops *ops;
+};
+
+#define TRANSPORT_PUSH_ALL 1
+#define TRANSPORT_PUSH_FORCE 2
+
+struct transport_ops {
+	/**
+	 * Returns 0 if successful, positive if the option is not
+	 * recognized or is inapplicable, and negative if the option
+	 * is applicable but the value is invalid.
+	 **/
+	int (*set_option)(struct transport *connection, const char *name,
+			  const char *value);
+
+	int (*push)(struct transport *connection, int refspec_nr, const char **refspec, int flags);
+
+	int (*disconnect)(struct transport *connection);
+};
+
+/* Returns a transport suitable for the url */
+struct transport *transport_get(struct remote *remote, const char *url,
+				int fetch);
+
+/* Transport options which apply to git:// and scp-style URLs */
+
+/* The program to use on the remote side to receive a pack */
+#define TRANS_OPT_RECEIVEPACK "receivepack"
+
+/* Transfer the data as a thin pack if not null */
+#define TRANS_OPT_THIN "thin"
+
+/**
+ * Returns 0 if the option was used, non-zero otherwise. Prints a
+ * message to stderr if the option is not used.
+ **/
+int transport_set_option(struct transport *transport, const char *name,
+			 const char *value);
+
+int transport_push(struct transport *connection,
+		   int refspec_nr, const char **refspec, int flags);
+
+int transport_disconnect(struct transport *transport);
+
+#endif