+static int get_importer(struct transport *transport, struct child_process *fastimport)
+{
+ struct child_process *helper = get_helper(transport);
+ memset(fastimport, 0, sizeof(*fastimport));
+ fastimport->in = helper->out;
+ fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
+ fastimport->argv[0] = "fast-import";
+ fastimport->argv[1] = "--quiet";
+
+ fastimport->git_cmd = 1;
+ return start_command(fastimport);
+}
+
+static int get_exporter(struct transport *transport,
+ struct child_process *fastexport,
+ const char *export_marks,
+ const char *import_marks,
+ struct string_list *revlist_args)
+{
+ struct child_process *helper = get_helper(transport);
+ int argc = 0, i;
+ memset(fastexport, 0, sizeof(*fastexport));
+
+ /* we need to duplicate helper->in because we want to use it after
+ * fastexport is done with it. */
+ fastexport->out = dup(helper->in);
+ fastexport->argv = xcalloc(4 + revlist_args->nr, sizeof(*fastexport->argv));
+ fastexport->argv[argc++] = "fast-export";
+ if (export_marks)
+ fastexport->argv[argc++] = export_marks;
+ if (import_marks)
+ fastexport->argv[argc++] = import_marks;
+
+ for (i = 0; i < revlist_args->nr; i++)
+ fastexport->argv[argc++] = revlist_args->items[i].string;
+
+ fastexport->git_cmd = 1;
+ return start_command(fastexport);
+}
+
+static int fetch_with_import(struct transport *transport,
+ int nr_heads, struct ref **to_fetch)
+{
+ struct child_process fastimport;
+ struct helper_data *data = transport->data;
+ int i;
+ struct ref *posn;
+ struct strbuf buf = STRBUF_INIT;
+
+ get_helper(transport);
+
+ if (get_importer(transport, &fastimport))
+ die("Couldn't run fast-import");
+
+ for (i = 0; i < nr_heads; i++) {
+ posn = to_fetch[i];
+ if (posn->status & REF_STATUS_UPTODATE)
+ continue;
+
+ strbuf_addf(&buf, "import %s\n", posn->name);
+ sendline(data, &buf);
+ strbuf_reset(&buf);
+ }
+ disconnect_helper(transport);
+ finish_command(&fastimport);
+ free(fastimport.argv);
+ fastimport.argv = NULL;
+
+ for (i = 0; i < nr_heads; i++) {
+ char *private;
+ posn = to_fetch[i];
+ if (posn->status & REF_STATUS_UPTODATE)
+ continue;
+ if (data->refspecs)
+ private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
+ else
+ private = strdup(posn->name);
+ read_ref(private, posn->old_sha1);
+ free(private);
+ }
+ strbuf_release(&buf);
+ return 0;
+}
+
+static int process_connect_service(struct transport *transport,
+ const char *name, const char *exec)
+{
+ struct helper_data *data = transport->data;
+ struct strbuf cmdbuf = STRBUF_INIT;
+ struct child_process *helper;
+ int r, duped, ret = 0;
+ FILE *input;
+
+ helper = get_helper(transport);
+
+ /*
+ * Yes, dup the pipe another time, as we need unbuffered version
+ * of input pipe as FILE*. fclose() closes the underlying fd and
+ * stream buffering only can be changed before first I/O operation
+ * on it.
+ */
+ duped = dup(helper->out);
+ if (duped < 0)
+ die_errno("Can't dup helper output fd");
+ input = xfdopen(duped, "r");
+ setvbuf(input, NULL, _IONBF, 0);
+
+ /*
+ * Handle --upload-pack and friends. This is fire and forget...
+ * just warn if it fails.
+ */
+ if (strcmp(name, exec)) {
+ r = set_helper_option(transport, "servpath", exec);
+ if (r > 0)
+ warning("Setting remote service path not supported by protocol.");
+ else if (r < 0)
+ warning("Invalid remote service path.");
+ }
+
+ if (data->connect)
+ strbuf_addf(&cmdbuf, "connect %s\n", name);
+ else
+ goto exit;
+
+ sendline(data, &cmdbuf);
+ recvline_fh(input, &cmdbuf);
+ if (!strcmp(cmdbuf.buf, "")) {
+ data->no_disconnect_req = 1;
+ if (debug)
+ fprintf(stderr, "Debug: Smart transport connection "
+ "ready.\n");
+ ret = 1;
+ } else if (!strcmp(cmdbuf.buf, "fallback")) {
+ if (debug)
+ fprintf(stderr, "Debug: Falling back to dumb "
+ "transport.\n");
+ } else
+ die("Unknown response to connect: %s",
+ cmdbuf.buf);
+
+exit:
+ fclose(input);
+ return ret;
+}
+
+static int process_connect(struct transport *transport,
+ int for_push)
+{
+ struct helper_data *data = transport->data;
+ const char *name;
+ const char *exec;
+
+ name = for_push ? "git-receive-pack" : "git-upload-pack";
+ if (for_push)
+ exec = data->transport_options.receivepack;
+ else
+ exec = data->transport_options.uploadpack;
+
+ return process_connect_service(transport, name, exec);
+}
+
+static int connect_helper(struct transport *transport, const char *name,
+ const char *exec, int fd[2])
+{
+ struct helper_data *data = transport->data;
+
+ /* Get_helper so connect is inited. */
+ get_helper(transport);
+ if (!data->connect)
+ die("Operation not supported by protocol.");
+
+ if (!process_connect_service(transport, name, exec))
+ die("Can't connect to subservice %s.", name);
+
+ fd[0] = data->helper->out;
+ fd[1] = data->helper->in;
+ return 0;
+}
+