transport-helper.c

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "quote.h"
   4 #include "run-command.h"
   5 #include "commit.h"
   6 #include "diff.h"
   7 #include "revision.h"
   8 #include "quote.h"
   9 #include "remote.h"
  10
  11 static int debug;
  12
  13 struct helper_data
  14 {
  15         const char *name;
  16         struct child_process *helper;
  17         FILE *out;
  18         unsigned fetch : 1,
  19                 import : 1,
  20                 option : 1,
  21                 push : 1,
  22                 connect : 1,
  23                 no_disconnect_req : 1;
  24         /* These go from remote name (as in "list") to private name */
  25         struct refspec *refspecs;
  26         int refspec_nr;
  27         /* Transport options for fetch-pack/send-pack (should one of
  28          * those be invoked).
  29          */
  30         struct git_transport_options transport_options;
  31 };
  32
  33 static void sendline(struct helper_data *helper, struct strbuf *buffer)
  34 {
  35         if (debug)
  36                 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
  37         if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
  38                 != buffer->len)
  39                 die_errno("Full write to remote helper failed");
  40 }
  41
  42 static int recvline_fh(FILE *helper, struct strbuf *buffer)
  43 {
  44         strbuf_reset(buffer);
  45         if (debug)
  46                 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
  47         if (strbuf_getline(buffer, helper, '\n') == EOF) {
  48                 if (debug)
  49                         fprintf(stderr, "Debug: Remote helper quit.\n");
  50                 exit(128);
  51         }
  52
  53         if (debug)
  54                 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
  55         return 0;
  56 }
  57
  58 static int recvline(struct helper_data *helper, struct strbuf *buffer)
  59 {
  60         return recvline_fh(helper->out, buffer);
  61 }
  62
  63 static void xchgline(struct helper_data *helper, struct strbuf *buffer)
  64 {
  65         sendline(helper, buffer);
  66         recvline(helper, buffer);
  67 }
  68
  69 static void write_constant(int fd, const char *str)
  70 {
  71         if (debug)
  72                 fprintf(stderr, "Debug: Remote helper: -> %s", str);
  73         if (write_in_full(fd, str, strlen(str)) != strlen(str))
  74                 die_errno("Full write to remote helper failed");
  75 }
  76
  77 const char *remove_ext_force(const char *url)
  78 {
  79         if (url) {
  80                 const char *colon = strchr(url, ':');
  81                 if (colon && colon[1] == ':')
  82                         return colon + 2;
  83         }
  84         return url;
  85 }
  86
  87 static void do_take_over(struct transport *transport)
  88 {
  89         struct helper_data *data;
  90         data = (struct helper_data *)transport->data;
  91         transport_take_over(transport, data->helper);
  92         fclose(data->out);
  93         free(data);
  94 }
  95
  96 static struct child_process *get_helper(struct transport *transport)
  97 {
  98         struct helper_data *data = transport->data;
  99         struct strbuf buf = STRBUF_INIT;
 100         struct child_process *helper;
 101         const char **refspecs = NULL;
 102         int refspec_nr = 0;
 103         int refspec_alloc = 0;
 104         int duped;
 105
 106         if (data->helper)
 107                 return data->helper;
 108
 109         helper = xcalloc(1, sizeof(*helper));
 110         helper->in = -1;
 111         helper->out = -1;
 112         helper->err = 0;
 113         helper->argv = xcalloc(4, sizeof(*helper->argv));
 114         strbuf_addf(&buf, "remote-%s", data->name);
 115         helper->argv[0] = strbuf_detach(&buf, NULL);
 116         helper->argv[1] = transport->remote->name;
 117         helper->argv[2] = remove_ext_force(transport->url);
 118         helper->git_cmd = 1;
 119         if (start_command(helper))
 120                 die("Unable to run helper: git %s", helper->argv[0]);
 121         data->helper = helper;
 122         data->no_disconnect_req = 0;
 123
 124         /*
 125          * Open the output as FILE* so strbuf_getline() can be used.
 126          * Do this with duped fd because fclose() will close the fd,
 127          * and stuff like taking over will require the fd to remain.
 128          */
 129         duped = dup(helper->out);
 130         if (duped < 0)
 131                 die_errno("Can't dup helper output fd");
 132         data->out = xfdopen(duped, "r");
 133
 134         write_constant(helper->in, "capabilities\n");
 135
 136         while (1) {
 137                 const char *capname;
 138                 int mandatory = 0;
 139                 recvline(data, &buf);
 140
 141                 if (!*buf.buf)
 142                         break;
 143
 144                 if (*buf.buf == '*') {
 145                         capname = buf.buf + 1;
 146                         mandatory = 1;
 147                 } else
 148                         capname = buf.buf;
 149
 150                 if (debug)
 151                         fprintf(stderr, "Debug: Got cap %s\n", capname);
 152                 if (!strcmp(capname, "fetch"))
 153                         data->fetch = 1;
 154                 else if (!strcmp(capname, "option"))
 155                         data->option = 1;
 156                 else if (!strcmp(capname, "push"))
 157                         data->push = 1;
 158                 else if (!strcmp(capname, "import"))
 159                         data->import = 1;
 160                 else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
 161                         ALLOC_GROW(refspecs,
 162                                    refspec_nr + 1,
 163                                    refspec_alloc);
 164                         refspecs[refspec_nr++] = strdup(buf.buf + strlen("refspec "));
 165                 } else if (!strcmp(capname, "connect")) {
 166                         data->connect = 1;
 167                 } else if (mandatory) {
 168                         die("Unknown madatory capability %s. This remote "
 169                             "helper probably needs newer version of Git.\n",
 170                             capname);
 171                 }
 172         }
 173         if (refspecs) {
 174                 int i;
 175                 data->refspec_nr = refspec_nr;
 176                 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
 177                 for (i = 0; i < refspec_nr; i++) {
 178                         free((char *)refspecs[i]);
 179                 }
 180                 free(refspecs);
 181         }
 182         strbuf_release(&buf);
 183         if (debug)
 184                 fprintf(stderr, "Debug: Capabilities complete.\n");
 185         return data->helper;
 186 }
 187
 188 static int disconnect_helper(struct transport *transport)
 189 {
 190         struct helper_data *data = transport->data;
 191         struct strbuf buf = STRBUF_INIT;
 192
 193         if (data->helper) {
 194                 if (debug)
 195                         fprintf(stderr, "Debug: Disconnecting.\n");
 196                 if (!data->no_disconnect_req) {
 197                         strbuf_addf(&buf, "\n");
 198                         sendline(data, &buf);
 199                 }
 200                 close(data->helper->in);
 201                 close(data->helper->out);
 202                 fclose(data->out);
 203                 finish_command(data->helper);
 204                 free((char *)data->helper->argv[0]);
 205                 free(data->helper->argv);
 206                 free(data->helper);
 207                 data->helper = NULL;
 208         }
 209         return 0;
 210 }
 211
 212 static const char *unsupported_options[] = {
 213         TRANS_OPT_UPLOADPACK,
 214         TRANS_OPT_RECEIVEPACK,
 215         TRANS_OPT_THIN,
 216         TRANS_OPT_KEEP
 217         };
 218 static const char *boolean_options[] = {
 219         TRANS_OPT_THIN,
 220         TRANS_OPT_KEEP,
 221         TRANS_OPT_FOLLOWTAGS
 222         };
 223
 224 static int set_helper_option(struct transport *transport,
 225                           const char *name, const char *value)
 226 {
 227         struct helper_data *data = transport->data;
 228         struct strbuf buf = STRBUF_INIT;
 229         int i, ret, is_bool = 0;
 230
 231         get_helper(transport);
 232
 233         if (!data->option)
 234                 return 1;
 235
 236         for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
 237                 if (!strcmp(name, unsupported_options[i]))
 238                         return 1;
 239         }
 240
 241         for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
 242                 if (!strcmp(name, boolean_options[i])) {
 243                         is_bool = 1;
 244                         break;
 245                 }
 246         }
 247
 248         strbuf_addf(&buf, "option %s ", name);
 249         if (is_bool)
 250                 strbuf_addstr(&buf, value ? "true" : "false");
 251         else
 252                 quote_c_style(value, &buf, NULL, 0);
 253         strbuf_addch(&buf, '\n');
 254
 255         xchgline(data, &buf);
 256
 257         if (!strcmp(buf.buf, "ok"))
 258                 ret = 0;
 259         else if (!prefixcmp(buf.buf, "error")) {
 260                 ret = -1;
 261         } else if (!strcmp(buf.buf, "unsupported"))
 262                 ret = 1;
 263         else {
 264                 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 265                 ret = 1;
 266         }
 267         strbuf_release(&buf);
 268         return ret;
 269 }
 270
 271 static void standard_options(struct transport *t)
 272 {
 273         char buf[16];
 274         int n;
 275         int v = t->verbose;
 276         int no_progress = v < 0 || (!t->progress && !isatty(2));
 277
 278         set_helper_option(t, "progress", !no_progress ? "true" : "false");
 279
 280         n = snprintf(buf, sizeof(buf), "%d", v + 1);
 281         if (n >= sizeof(buf))
 282                 die("impossibly large verbosity value");
 283         set_helper_option(t, "verbosity", buf);
 284 }
 285
 286 static int release_helper(struct transport *transport)
 287 {
 288         struct helper_data *data = transport->data;
 289         free_refspec(data->refspec_nr, data->refspecs);
 290         data->refspecs = NULL;
 291         disconnect_helper(transport);
 292         free(transport->data);
 293         return 0;
 294 }
 295
 296 static int fetch_with_fetch(struct transport *transport,
 297                             int nr_heads, struct ref **to_fetch)
 298 {
 299         struct helper_data *data = transport->data;
 300         int i;
 301         struct strbuf buf = STRBUF_INIT;
 302
 303         standard_options(transport);
 304
 305         for (i = 0; i < nr_heads; i++) {
 306                 const struct ref *posn = to_fetch[i];
 307                 if (posn->status & REF_STATUS_UPTODATE)
 308                         continue;
 309
 310                 strbuf_addf(&buf, "fetch %s %s\n",
 311                             sha1_to_hex(posn->old_sha1), posn->name);
 312         }
 313
 314         strbuf_addch(&buf, '\n');
 315         sendline(data, &buf);
 316
 317         while (1) {
 318                 recvline(data, &buf);
 319
 320                 if (!prefixcmp(buf.buf, "lock ")) {
 321                         const char *name = buf.buf + 5;
 322                         if (transport->pack_lockfile)
 323                                 warning("%s also locked %s", data->name, name);
 324                         else
 325                                 transport->pack_lockfile = xstrdup(name);
 326                 }
 327                 else if (!buf.len)
 328                         break;
 329                 else
 330                         warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 331         }
 332         strbuf_release(&buf);
 333         return 0;
 334 }
 335
 336 static int get_importer(struct transport *transport, struct child_process *fastimport)
 337 {
 338         struct child_process *helper = get_helper(transport);
 339         memset(fastimport, 0, sizeof(*fastimport));
 340         fastimport->in = helper->out;
 341         fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
 342         fastimport->argv[0] = "fast-import";
 343         fastimport->argv[1] = "--quiet";
 344
 345         fastimport->git_cmd = 1;
 346         return start_command(fastimport);
 347 }
 348
 349 static int fetch_with_import(struct transport *transport,
 350                              int nr_heads, struct ref **to_fetch)
 351 {
 352         struct child_process fastimport;
 353         struct helper_data *data = transport->data;
 354         int i;
 355         struct ref *posn;
 356         struct strbuf buf = STRBUF_INIT;
 357
 358         get_helper(transport);
 359
 360         if (get_importer(transport, &fastimport))
 361                 die("Couldn't run fast-import");
 362
 363         for (i = 0; i < nr_heads; i++) {
 364                 posn = to_fetch[i];
 365                 if (posn->status & REF_STATUS_UPTODATE)
 366                         continue;
 367
 368                 strbuf_addf(&buf, "import %s\n", posn->name);
 369                 sendline(data, &buf);
 370                 strbuf_reset(&buf);
 371         }
 372         disconnect_helper(transport);
 373         finish_command(&fastimport);
 374         free(fastimport.argv);
 375         fastimport.argv = NULL;
 376
 377         for (i = 0; i < nr_heads; i++) {
 378                 char *private;
 379                 posn = to_fetch[i];
 380                 if (posn->status & REF_STATUS_UPTODATE)
 381                         continue;
 382                 if (data->refspecs)
 383                         private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
 384                 else
 385                         private = strdup(posn->name);
 386                 read_ref(private, posn->old_sha1);
 387                 free(private);
 388         }
 389         strbuf_release(&buf);
 390         return 0;
 391 }
 392
 393 static int process_connect_service(struct transport *transport,
 394                                    const char *name, const char *exec)
 395 {
 396         struct helper_data *data = transport->data;
 397         struct strbuf cmdbuf = STRBUF_INIT;
 398         struct child_process *helper;
 399         int r, duped, ret = 0;
 400         FILE *input;
 401
 402         helper = get_helper(transport);
 403
 404         /*
 405          * Yes, dup the pipe another time, as we need unbuffered version
 406          * of input pipe as FILE*. fclose() closes the underlying fd and
 407          * stream buffering only can be changed before first I/O operation
 408          * on it.
 409          */
 410         duped = dup(helper->out);
 411         if (duped < 0)
 412                 die_errno("Can't dup helper output fd");
 413         input = xfdopen(duped, "r");
 414         setvbuf(input, NULL, _IONBF, 0);
 415
 416         /*
 417          * Handle --upload-pack and friends. This is fire and forget...
 418          * just warn if it fails.
 419          */
 420         if (strcmp(name, exec)) {
 421                 r = set_helper_option(transport, "servpath", exec);
 422                 if (r > 0)
 423                         warning("Setting remote service path not supported by protocol.");
 424                 else if (r < 0)
 425                         warning("Invalid remote service path.");
 426         }
 427
 428         if (data->connect)
 429                 strbuf_addf(&cmdbuf, "connect %s\n", name);
 430         else
 431                 goto exit;
 432
 433         sendline(data, &cmdbuf);
 434         recvline_fh(input, &cmdbuf);
 435         if (!strcmp(cmdbuf.buf, "")) {
 436                 data->no_disconnect_req = 1;
 437                 if (debug)
 438                         fprintf(stderr, "Debug: Smart transport connection "
 439                                 "ready.\n");
 440                 ret = 1;
 441         } else if (!strcmp(cmdbuf.buf, "fallback")) {
 442                 if (debug)
 443                         fprintf(stderr, "Debug: Falling back to dumb "
 444                                 "transport.\n");
 445         } else
 446                 die("Unknown response to connect: %s",
 447                         cmdbuf.buf);
 448
 449 exit:
 450         fclose(input);
 451         return ret;
 452 }
 453
 454 static int process_connect(struct transport *transport,
 455                                      int for_push)
 456 {
 457         struct helper_data *data = transport->data;
 458         const char *name;
 459         const char *exec;
 460
 461         name = for_push ? "git-receive-pack" : "git-upload-pack";
 462         if (for_push)
 463                 exec = data->transport_options.receivepack;
 464         else
 465                 exec = data->transport_options.uploadpack;
 466
 467         return process_connect_service(transport, name, exec);
 468 }
 469
 470 static int connect_helper(struct transport *transport, const char *name,
 471                    const char *exec, int fd[2])
 472 {
 473         struct helper_data *data = transport->data;
 474
 475         /* Get_helper so connect is inited. */
 476         get_helper(transport);
 477         if (!data->connect)
 478                 die("Operation not supported by protocol.");
 479
 480         if (!process_connect_service(transport, name, exec))
 481                 die("Can't connect to subservice %s.", name);
 482
 483         fd[0] = data->helper->out;
 484         fd[1] = data->helper->in;
 485         return 0;
 486 }
 487
 488 static int fetch(struct transport *transport,
 489                  int nr_heads, struct ref **to_fetch)
 490 {
 491         struct helper_data *data = transport->data;
 492         int i, count;
 493
 494         if (process_connect(transport, 0)) {
 495                 do_take_over(transport);
 496                 return transport->fetch(transport, nr_heads, to_fetch);
 497         }
 498
 499         count = 0;
 500         for (i = 0; i < nr_heads; i++)
 501                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 502                         count++;
 503
 504         if (!count)
 505                 return 0;
 506
 507         if (data->fetch)
 508                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 509
 510         if (data->import)
 511                 return fetch_with_import(transport, nr_heads, to_fetch);
 512
 513         return -1;
 514 }
 515
 516 static int push_refs(struct transport *transport,
 517                 struct ref *remote_refs, int flags)
 518 {
 519         int force_all = flags & TRANSPORT_PUSH_FORCE;
 520         int mirror = flags & TRANSPORT_PUSH_MIRROR;
 521         struct helper_data *data = transport->data;
 522         struct strbuf buf = STRBUF_INIT;
 523         struct child_process *helper;
 524         struct ref *ref;
 525
 526         if (process_connect(transport, 1)) {
 527                 do_take_over(transport);
 528                 return transport->push_refs(transport, remote_refs, flags);
 529         }
 530
 531         if (!remote_refs)
 532                 return 0;
 533
 534         helper = get_helper(transport);
 535         if (!data->push)
 536                 return 1;
 537
 538         for (ref = remote_refs; ref; ref = ref->next) {
 539                 if (ref->peer_ref)
 540                         hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 541                 else if (!mirror)
 542                         continue;
 543
 544                 ref->deletion = is_null_sha1(ref->new_sha1);
 545                 if (!ref->deletion &&
 546                         !hashcmp(ref->old_sha1, ref->new_sha1)) {
 547                         ref->status = REF_STATUS_UPTODATE;
 548                         continue;
 549                 }
 550
 551                 if (force_all)
 552                         ref->force = 1;
 553
 554                 strbuf_addstr(&buf, "push ");
 555                 if (!ref->deletion) {
 556                         if (ref->force)
 557                                 strbuf_addch(&buf, '+');
 558                         if (ref->peer_ref)
 559                                 strbuf_addstr(&buf, ref->peer_ref->name);
 560                         else
 561                                 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
 562                 }
 563                 strbuf_addch(&buf, ':');
 564                 strbuf_addstr(&buf, ref->name);
 565                 strbuf_addch(&buf, '\n');
 566         }
 567         if (buf.len == 0)
 568                 return 0;
 569
 570         transport->verbose = flags & TRANSPORT_PUSH_VERBOSE ? 1 : 0;
 571         standard_options(transport);
 572
 573         if (flags & TRANSPORT_PUSH_DRY_RUN) {
 574                 if (set_helper_option(transport, "dry-run", "true") != 0)
 575                         die("helper %s does not support dry-run", data->name);
 576         }
 577
 578         strbuf_addch(&buf, '\n');
 579         sendline(data, &buf);
 580
 581         ref = remote_refs;
 582         while (1) {
 583                 char *refname, *msg;
 584                 int status;
 585
 586                 recvline(data, &buf);
 587                 if (!buf.len)
 588                         break;
 589
 590                 if (!prefixcmp(buf.buf, "ok ")) {
 591                         status = REF_STATUS_OK;
 592                         refname = buf.buf + 3;
 593                 } else if (!prefixcmp(buf.buf, "error ")) {
 594                         status = REF_STATUS_REMOTE_REJECT;
 595                         refname = buf.buf + 6;
 596                 } else
 597                         die("expected ok/error, helper said '%s'\n", buf.buf);
 598
 599                 msg = strchr(refname, ' ');
 600                 if (msg) {
 601                         struct strbuf msg_buf = STRBUF_INIT;
 602                         const char *end;
 603
 604                         *msg++ = '\0';
 605                         if (!unquote_c_style(&msg_buf, msg, &end))
 606                                 msg = strbuf_detach(&msg_buf, NULL);
 607                         else
 608                                 msg = xstrdup(msg);
 609                         strbuf_release(&msg_buf);
 610
 611                         if (!strcmp(msg, "no match")) {
 612                                 status = REF_STATUS_NONE;
 613                                 free(msg);
 614                                 msg = NULL;
 615                         }
 616                         else if (!strcmp(msg, "up to date")) {
 617                                 status = REF_STATUS_UPTODATE;
 618                                 free(msg);
 619                                 msg = NULL;
 620                         }
 621                         else if (!strcmp(msg, "non-fast forward")) {
 622                                 status = REF_STATUS_REJECT_NONFASTFORWARD;
 623                                 free(msg);
 624                                 msg = NULL;
 625                         }
 626                 }
 627
 628                 if (ref)
 629                         ref = find_ref_by_name(ref, refname);
 630                 if (!ref)
 631                         ref = find_ref_by_name(remote_refs, refname);
 632                 if (!ref) {
 633                         warning("helper reported unexpected status of %s", refname);
 634                         continue;
 635                 }
 636
 637                 ref->status = status;
 638                 ref->remote_status = msg;
 639         }
 640         strbuf_release(&buf);
 641         return 0;
 642 }
 643
 644 static int has_attribute(const char *attrs, const char *attr) {
 645         int len;
 646         if (!attrs)
 647                 return 0;
 648
 649         len = strlen(attr);
 650         for (;;) {
 651                 const char *space = strchrnul(attrs, ' ');
 652                 if (len == space - attrs && !strncmp(attrs, attr, len))
 653                         return 1;
 654                 if (!*space)
 655                         return 0;
 656                 attrs = space + 1;
 657         }
 658 }
 659
 660 static struct ref *get_refs_list(struct transport *transport, int for_push)
 661 {
 662         struct helper_data *data = transport->data;
 663         struct child_process *helper;
 664         struct ref *ret = NULL;
 665         struct ref **tail = &ret;
 666         struct ref *posn;
 667         struct strbuf buf = STRBUF_INIT;
 668
 669         helper = get_helper(transport);
 670
 671         if (process_connect(transport, for_push)) {
 672                 do_take_over(transport);
 673                 return transport->get_refs_list(transport, for_push);
 674         }
 675
 676         if (data->push && for_push)
 677                 write_str_in_full(helper->in, "list for-push\n");
 678         else
 679                 write_str_in_full(helper->in, "list\n");
 680
 681         while (1) {
 682                 char *eov, *eon;
 683                 recvline(data, &buf);
 684
 685                 if (!*buf.buf)
 686                         break;
 687
 688                 eov = strchr(buf.buf, ' ');
 689                 if (!eov)
 690                         die("Malformed response in ref list: %s", buf.buf);
 691                 eon = strchr(eov + 1, ' ');
 692                 *eov = '\0';
 693                 if (eon)
 694                         *eon = '\0';
 695                 *tail = alloc_ref(eov + 1);
 696                 if (buf.buf[0] == '@')
 697                         (*tail)->symref = xstrdup(buf.buf + 1);
 698                 else if (buf.buf[0] != '?')
 699                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 700                 if (eon) {
 701                         if (has_attribute(eon + 1, "unchanged")) {
 702                                 (*tail)->status |= REF_STATUS_UPTODATE;
 703                                 read_ref((*tail)->name, (*tail)->old_sha1);
 704                         }
 705                 }
 706                 tail = &((*tail)->next);
 707         }
 708         if (debug)
 709                 fprintf(stderr, "Debug: Read ref listing.\n");
 710         strbuf_release(&buf);
 711
 712         for (posn = ret; posn; posn = posn->next)
 713                 resolve_remote_symref(posn, ret);
 714
 715         return ret;
 716 }
 717
 718 int transport_helper_init(struct transport *transport, const char *name)
 719 {
 720         struct helper_data *data = xcalloc(sizeof(*data), 1);
 721         data->name = name;
 722
 723         if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
 724                 debug = 1;
 725
 726         transport->data = data;
 727         transport->set_option = set_helper_option;
 728         transport->get_refs_list = get_refs_list;
 729         transport->fetch = fetch;
 730         transport->push_refs = push_refs;
 731         transport->disconnect = release_helper;
 732         transport->connect = connect_helper;
 733         transport->smart_options = &(data->transport_options);
 734         return 0;
 735 }