Add bundle transport

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

transport.c

@@ -5,6 +5,7 @@
 #include "pkt-line.h"
 #include "fetch-pack.h"
 #include "walker.h"
+#include "bundle.h"
 
 /* Generic functions for using commit walkers */
 
@@ -184,7 +185,55 @@ static const struct transport_ops curl_transport = {
 	/* disconnect */	disconnect_walker
 };
 
+struct bundle_transport_data {
+	int fd;
+	struct bundle_header header;
+};
+
+static struct ref *get_refs_from_bundle(const struct transport *transport)
+{
+	struct bundle_transport_data *data = transport->data;
+	struct ref *result = NULL;
+	int i;
+
+	if (data->fd > 0)
+		close(data->fd);
+	data->fd = read_bundle_header(transport->url, &data->header);
+	if (data->fd < 0)
+		die ("Could not read bundle '%s'.", transport->url);
+	for (i = 0; i < data->header.references.nr; i++) {
+		struct ref_list_entry *e = data->header.references.list + i;
+		struct ref *ref = alloc_ref(strlen(e->name));
+		hashcpy(ref->old_sha1, e->sha1);
+		strcpy(ref->name, e->name);
+		ref->next = result;
+		result = ref;
+	}
+	return result;
+}
+
+static int fetch_refs_from_bundle(const struct transport *transport,
+			       int nr_heads, char **heads)
+{
+	struct bundle_transport_data *data = transport->data;
+	return unbundle(&data->header, data->fd);
+}
+
+static int close_bundle(struct transport *transport)
+{
+	struct bundle_transport_data *data = transport->data;
+	if (data->fd > 0)
+		close(data->fd);
+	return 0;
+}
+
 static const struct transport_ops bundle_transport = {
+	/* set_option */	NULL,
+	/* get_refs_list */	get_refs_from_bundle,
+	/* fetch_refs */	fetch_refs_from_bundle,
+	/* fetch_objs */	NULL,
+	/* push */		NULL,
+	/* disconnect */	close_bundle
 };
 
 struct git_transport_data {
@@ -367,8 +416,9 @@ struct transport *transport_get(struct remote *remote, const char *url,
 		else
 			ret->data = NULL;
 	} else if (is_local(url) && is_file(url)) {
+		struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 		ret = xmalloc(sizeof(*ret));
-		ret->data = NULL;
+		ret->data = data;
 		ret->ops = &bundle_transport;
 	} else {
 		struct git_transport_data *data = xcalloc(1, sizeof(*data));