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         int code;
 106
 107         if (data->helper)
 108                 return data->helper;
 109
 110         helper = xcalloc(1, sizeof(*helper));
 111         helper->in = -1;
 112         helper->out = -1;
 113         helper->err = 0;
 114         helper->argv = xcalloc(4, sizeof(*helper->argv));
 115         strbuf_addf(&buf, "git-remote-%s", data->name);
 116         helper->argv[0] = strbuf_detach(&buf, NULL);
 117         helper->argv[1] = transport->remote->name;
 118         helper->argv[2] = remove_ext_force(transport->url);
 119         helper->git_cmd = 0;
 120         helper->silent_exec_failure = 1;
 121         code = start_command(helper);
 122         if (code < 0 && errno == ENOENT)
 123                 die("Unable to find remote helper for '%s'", data->name);
 124         else if (code != 0)
 125                 exit(code);
 126
 127         data->helper = helper;
 128         data->no_disconnect_req = 0;
 129
 130         /*
 131          * Open the output as FILE* so strbuf_getline() can be used.
 132          * Do this with duped fd because fclose() will close the fd,
 133          * and stuff like taking over will require the fd to remain.
 134          */
 135         duped = dup(helper->out);
 136         if (duped < 0)
 137                 die_errno("Can't dup helper output fd");
 138         data->out = xfdopen(duped, "r");
 139
 140         write_constant(helper->in, "capabilities\n");
 141
 142         while (1) {
 143                 const char *capname;
 144                 int mandatory = 0;
 145                 recvline(data, &buf);
 146
 147                 if (!*buf.buf)
 148                         break;
 149
 150                 if (*buf.buf == '*') {
 151                         capname = buf.buf + 1;
 152                         mandatory = 1;
 153                 } else
 154                         capname = buf.buf;
 155
 156                 if (debug)
 157                         fprintf(stderr, "Debug: Got cap %s\n", capname);
 158                 if (!strcmp(capname, "fetch"))
 159                         data->fetch = 1;
 160                 else if (!strcmp(capname, "option"))
 161                         data->option = 1;
 162                 else if (!strcmp(capname, "push"))
 163                         data->push = 1;
 164                 else if (!strcmp(capname, "import"))
 165                         data->import = 1;
 166                 else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
 167                         ALLOC_GROW(refspecs,
 168                                    refspec_nr + 1,
 169                                    refspec_alloc);
 170                         refspecs[refspec_nr++] = strdup(buf.buf + strlen("refspec "));
 171                 } else if (!strcmp(capname, "connect")) {
 172                         data->connect = 1;
 173                 } else if (mandatory) {
 174                         die("Unknown mandatory capability %s. This remote "
 175                             "helper probably needs newer version of Git.\n",
 176                             capname);
 177                 }
 178         }
 179         if (refspecs) {
 180                 int i;
 181                 data->refspec_nr = refspec_nr;
 182                 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
 183                 for (i = 0; i < refspec_nr; i++) {
 184                         free((char *)refspecs[i]);
 185                 }
 186                 free(refspecs);
 187         }
 188         strbuf_release(&buf);
 189         if (debug)
 190                 fprintf(stderr, "Debug: Capabilities complete.\n");
 191         return data->helper;
 192 }
 193
 194 static int disconnect_helper(struct transport *transport)
 195 {
 196         struct helper_data *data = transport->data;
 197         struct strbuf buf = STRBUF_INIT;
 198
 199         if (data->helper) {
 200                 if (debug)
 201                         fprintf(stderr, "Debug: Disconnecting.\n");
 202                 if (!data->no_disconnect_req) {
 203                         strbuf_addf(&buf, "\n");
 204                         sendline(data, &buf);
 205                 }
 206                 close(data->helper->in);
 207                 close(data->helper->out);
 208                 fclose(data->out);
 209                 finish_command(data->helper);
 210                 free((char *)data->helper->argv[0]);
 211                 free(data->helper->argv);
 212                 free(data->helper);
 213                 data->helper = NULL;
 214         }
 215         return 0;
 216 }
 217
 218 static const char *unsupported_options[] = {
 219         TRANS_OPT_UPLOADPACK,
 220         TRANS_OPT_RECEIVEPACK,
 221         TRANS_OPT_THIN,
 222         TRANS_OPT_KEEP
 223         };
 224 static const char *boolean_options[] = {
 225         TRANS_OPT_THIN,
 226         TRANS_OPT_KEEP,
 227         TRANS_OPT_FOLLOWTAGS
 228         };
 229
 230 static int set_helper_option(struct transport *transport,
 231                           const char *name, const char *value)
 232 {
 233         struct helper_data *data = transport->data;
 234         struct strbuf buf = STRBUF_INIT;
 235         int i, ret, is_bool = 0;
 236
 237         get_helper(transport);
 238
 239         if (!data->option)
 240                 return 1;
 241
 242         for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
 243                 if (!strcmp(name, unsupported_options[i]))
 244                         return 1;
 245         }
 246
 247         for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
 248                 if (!strcmp(name, boolean_options[i])) {
 249                         is_bool = 1;
 250                         break;
 251                 }
 252         }
 253
 254         strbuf_addf(&buf, "option %s ", name);
 255         if (is_bool)
 256                 strbuf_addstr(&buf, value ? "true" : "false");
 257         else
 258                 quote_c_style(value, &buf, NULL, 0);
 259         strbuf_addch(&buf, '\n');
 260
 261         xchgline(data, &buf);
 262
 263         if (!strcmp(buf.buf, "ok"))
 264                 ret = 0;
 265         else if (!prefixcmp(buf.buf, "error")) {
 266                 ret = -1;
 267         } else if (!strcmp(buf.buf, "unsupported"))
 268                 ret = 1;
 269         else {
 270                 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 271                 ret = 1;
 272         }
 273         strbuf_release(&buf);
 274         return ret;
 275 }
 276
 277 static void standard_options(struct transport *t)
 278 {
 279         char buf[16];
 280         int n;
 281         int v = t->verbose;
 282         int no_progress = v < 0 || (!t->progress && !isatty(2));
 283
 284         set_helper_option(t, "progress", !no_progress ? "true" : "false");
 285
 286         n = snprintf(buf, sizeof(buf), "%d", v + 1);
 287         if (n >= sizeof(buf))
 288                 die("impossibly large verbosity value");
 289         set_helper_option(t, "verbosity", buf);
 290 }
 291
 292 static int release_helper(struct transport *transport)
 293 {
 294         struct helper_data *data = transport->data;
 295         free_refspec(data->refspec_nr, data->refspecs);
 296         data->refspecs = NULL;
 297         disconnect_helper(transport);
 298         free(transport->data);
 299         return 0;
 300 }
 301
 302 static int fetch_with_fetch(struct transport *transport,
 303                             int nr_heads, struct ref **to_fetch)
 304 {
 305         struct helper_data *data = transport->data;
 306         int i;
 307         struct strbuf buf = STRBUF_INIT;
 308
 309         standard_options(transport);
 310
 311         for (i = 0; i < nr_heads; i++) {
 312                 const struct ref *posn = to_fetch[i];
 313                 if (posn->status & REF_STATUS_UPTODATE)
 314                         continue;
 315
 316                 strbuf_addf(&buf, "fetch %s %s\n",
 317                             sha1_to_hex(posn->old_sha1), posn->name);
 318         }
 319
 320         strbuf_addch(&buf, '\n');
 321         sendline(data, &buf);
 322
 323         while (1) {
 324                 recvline(data, &buf);
 325
 326                 if (!prefixcmp(buf.buf, "lock ")) {
 327                         const char *name = buf.buf + 5;
 328                         if (transport->pack_lockfile)
 329                                 warning("%s also locked %s", data->name, name);
 330                         else
 331                                 transport->pack_lockfile = xstrdup(name);
 332                 }
 333                 else if (!buf.len)
 334                         break;
 335                 else
 336                         warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 337         }
 338         strbuf_release(&buf);
 339         return 0;
 340 }
 341
 342 static int get_importer(struct transport *transport, struct child_process *fastimport)
 343 {
 344         struct child_process *helper = get_helper(transport);
 345         memset(fastimport, 0, sizeof(*fastimport));
 346         fastimport->in = helper->out;
 347         fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
 348         fastimport->argv[0] = "fast-import";
 349         fastimport->argv[1] = "--quiet";
 350
 351         fastimport->git_cmd = 1;
 352         return start_command(fastimport);
 353 }
 354
 355 static int fetch_with_import(struct transport *transport,
 356                              int nr_heads, struct ref **to_fetch)
 357 {
 358         struct child_process fastimport;
 359         struct helper_data *data = transport->data;
 360         int i;
 361         struct ref *posn;
 362         struct strbuf buf = STRBUF_INIT;
 363
 364         get_helper(transport);
 365
 366         if (get_importer(transport, &fastimport))
 367                 die("Couldn't run fast-import");
 368
 369         for (i = 0; i < nr_heads; i++) {
 370                 posn = to_fetch[i];
 371                 if (posn->status & REF_STATUS_UPTODATE)
 372                         continue;
 373
 374                 strbuf_addf(&buf, "import %s\n", posn->name);
 375                 sendline(data, &buf);
 376                 strbuf_reset(&buf);
 377         }
 378         disconnect_helper(transport);
 379         finish_command(&fastimport);
 380         free(fastimport.argv);
 381         fastimport.argv = NULL;
 382
 383         for (i = 0; i < nr_heads; i++) {
 384                 char *private;
 385                 posn = to_fetch[i];
 386                 if (posn->status & REF_STATUS_UPTODATE)
 387                         continue;
 388                 if (data->refspecs)
 389                         private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
 390                 else
 391                         private = strdup(posn->name);
 392                 read_ref(private, posn->old_sha1);
 393                 free(private);
 394         }
 395         strbuf_release(&buf);
 396         return 0;
 397 }
 398
 399 static int process_connect_service(struct transport *transport,
 400                                    const char *name, const char *exec)
 401 {
 402         struct helper_data *data = transport->data;
 403         struct strbuf cmdbuf = STRBUF_INIT;
 404         struct child_process *helper;
 405         int r, duped, ret = 0;
 406         FILE *input;
 407
 408         helper = get_helper(transport);
 409
 410         /*
 411          * Yes, dup the pipe another time, as we need unbuffered version
 412          * of input pipe as FILE*. fclose() closes the underlying fd and
 413          * stream buffering only can be changed before first I/O operation
 414          * on it.
 415          */
 416         duped = dup(helper->out);
 417         if (duped < 0)
 418                 die_errno("Can't dup helper output fd");
 419         input = xfdopen(duped, "r");
 420         setvbuf(input, NULL, _IONBF, 0);
 421
 422         /*
 423          * Handle --upload-pack and friends. This is fire and forget...
 424          * just warn if it fails.
 425          */
 426         if (strcmp(name, exec)) {
 427                 r = set_helper_option(transport, "servpath", exec);
 428                 if (r > 0)
 429                         warning("Setting remote service path not supported by protocol.");
 430                 else if (r < 0)
 431                         warning("Invalid remote service path.");
 432         }
 433
 434         if (data->connect)
 435                 strbuf_addf(&cmdbuf, "connect %s\n", name);
 436         else
 437                 goto exit;
 438
 439         sendline(data, &cmdbuf);
 440         recvline_fh(input, &cmdbuf);
 441         if (!strcmp(cmdbuf.buf, "")) {
 442                 data->no_disconnect_req = 1;
 443                 if (debug)
 444                         fprintf(stderr, "Debug: Smart transport connection "
 445                                 "ready.\n");
 446                 ret = 1;
 447         } else if (!strcmp(cmdbuf.buf, "fallback")) {
 448                 if (debug)
 449                         fprintf(stderr, "Debug: Falling back to dumb "
 450                                 "transport.\n");
 451         } else
 452                 die("Unknown response to connect: %s",
 453                         cmdbuf.buf);
 454
 455 exit:
 456         fclose(input);
 457         return ret;
 458 }
 459
 460 static int process_connect(struct transport *transport,
 461                                      int for_push)
 462 {
 463         struct helper_data *data = transport->data;
 464         const char *name;
 465         const char *exec;
 466
 467         name = for_push ? "git-receive-pack" : "git-upload-pack";
 468         if (for_push)
 469                 exec = data->transport_options.receivepack;
 470         else
 471                 exec = data->transport_options.uploadpack;
 472
 473         return process_connect_service(transport, name, exec);
 474 }
 475
 476 static int connect_helper(struct transport *transport, const char *name,
 477                    const char *exec, int fd[2])
 478 {
 479         struct helper_data *data = transport->data;
 480
 481         /* Get_helper so connect is inited. */
 482         get_helper(transport);
 483         if (!data->connect)
 484                 die("Operation not supported by protocol.");
 485
 486         if (!process_connect_service(transport, name, exec))
 487                 die("Can't connect to subservice %s.", name);
 488
 489         fd[0] = data->helper->out;
 490         fd[1] = data->helper->in;
 491         return 0;
 492 }
 493
 494 static int fetch(struct transport *transport,
 495                  int nr_heads, struct ref **to_fetch)
 496 {
 497         struct helper_data *data = transport->data;
 498         int i, count;
 499
 500         if (process_connect(transport, 0)) {
 501                 do_take_over(transport);
 502                 return transport->fetch(transport, nr_heads, to_fetch);
 503         }
 504
 505         count = 0;
 506         for (i = 0; i < nr_heads; i++)
 507                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 508                         count++;
 509
 510         if (!count)
 511                 return 0;
 512
 513         if (data->fetch)
 514                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 515
 516         if (data->import)
 517                 return fetch_with_import(transport, nr_heads, to_fetch);
 518
 519         return -1;
 520 }
 521
 522 static int push_refs(struct transport *transport,
 523                 struct ref *remote_refs, int flags)
 524 {
 525         int force_all = flags & TRANSPORT_PUSH_FORCE;
 526         int mirror = flags & TRANSPORT_PUSH_MIRROR;
 527         struct helper_data *data = transport->data;
 528         struct strbuf buf = STRBUF_INIT;
 529         struct child_process *helper;
 530         struct ref *ref;
 531
 532         if (process_connect(transport, 1)) {
 533                 do_take_over(transport);
 534                 return transport->push_refs(transport, remote_refs, flags);
 535         }
 536
 537         if (!remote_refs) {
 538                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 539                         "Perhaps you should specify a branch such as 'master'.\n");
 540                 return 0;
 541         }
 542
 543         helper = get_helper(transport);
 544         if (!data->push)
 545                 return 1;
 546
 547         for (ref = remote_refs; ref; ref = ref->next) {
 548                 if (!ref->peer_ref && !mirror)
 549                         continue;
 550
 551                 /* Check for statuses set by set_ref_status_for_push() */
 552                 switch (ref->status) {
 553                 case REF_STATUS_REJECT_NONFASTFORWARD:
 554                 case REF_STATUS_UPTODATE:
 555                         continue;
 556                 default:
 557                         ; /* do nothing */
 558                 }
 559
 560                 if (force_all)
 561                         ref->force = 1;
 562
 563                 strbuf_addstr(&buf, "push ");
 564                 if (!ref->deletion) {
 565                         if (ref->force)
 566                                 strbuf_addch(&buf, '+');
 567                         if (ref->peer_ref)
 568                                 strbuf_addstr(&buf, ref->peer_ref->name);
 569                         else
 570                                 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
 571                 }
 572                 strbuf_addch(&buf, ':');
 573                 strbuf_addstr(&buf, ref->name);
 574                 strbuf_addch(&buf, '\n');
 575         }
 576         if (buf.len == 0)
 577                 return 0;
 578
 579         transport->verbose = flags & TRANSPORT_PUSH_VERBOSE ? 1 : 0;
 580         standard_options(transport);
 581
 582         if (flags & TRANSPORT_PUSH_DRY_RUN) {
 583                 if (set_helper_option(transport, "dry-run", "true") != 0)
 584                         die("helper %s does not support dry-run", data->name);
 585         }
 586
 587         strbuf_addch(&buf, '\n');
 588         sendline(data, &buf);
 589
 590         ref = remote_refs;
 591         while (1) {
 592                 char *refname, *msg;
 593                 int status;
 594
 595                 recvline(data, &buf);
 596                 if (!buf.len)
 597                         break;
 598
 599                 if (!prefixcmp(buf.buf, "ok ")) {
 600                         status = REF_STATUS_OK;
 601                         refname = buf.buf + 3;
 602                 } else if (!prefixcmp(buf.buf, "error ")) {
 603                         status = REF_STATUS_REMOTE_REJECT;
 604                         refname = buf.buf + 6;
 605                 } else
 606                         die("expected ok/error, helper said '%s'\n", buf.buf);
 607
 608                 msg = strchr(refname, ' ');
 609                 if (msg) {
 610                         struct strbuf msg_buf = STRBUF_INIT;
 611                         const char *end;
 612
 613                         *msg++ = '\0';
 614                         if (!unquote_c_style(&msg_buf, msg, &end))
 615                                 msg = strbuf_detach(&msg_buf, NULL);
 616                         else
 617                                 msg = xstrdup(msg);
 618                         strbuf_release(&msg_buf);
 619
 620                         if (!strcmp(msg, "no match")) {
 621                                 status = REF_STATUS_NONE;
 622                                 free(msg);
 623                                 msg = NULL;
 624                         }
 625                         else if (!strcmp(msg, "up to date")) {
 626                                 status = REF_STATUS_UPTODATE;
 627                                 free(msg);
 628                                 msg = NULL;
 629                         }
 630                         else if (!strcmp(msg, "non-fast forward")) {
 631                                 status = REF_STATUS_REJECT_NONFASTFORWARD;
 632                                 free(msg);
 633                                 msg = NULL;
 634                         }
 635                 }
 636
 637                 if (ref)
 638                         ref = find_ref_by_name(ref, refname);
 639                 if (!ref)
 640                         ref = find_ref_by_name(remote_refs, refname);
 641                 if (!ref) {
 642                         warning("helper reported unexpected status of %s", refname);
 643                         continue;
 644                 }
 645
 646                 if (ref->status != REF_STATUS_NONE) {
 647                         /*
 648                          * Earlier, the ref was marked not to be pushed, so ignore the ref
 649                          * status reported by the remote helper if the latter is 'no match'.
 650                          */
 651                         if (status == REF_STATUS_NONE)
 652                                 continue;
 653                 }
 654
 655                 ref->status = status;
 656                 ref->remote_status = msg;
 657         }
 658         strbuf_release(&buf);
 659         return 0;
 660 }
 661
 662 static int has_attribute(const char *attrs, const char *attr) {
 663         int len;
 664         if (!attrs)
 665                 return 0;
 666
 667         len = strlen(attr);
 668         for (;;) {
 669                 const char *space = strchrnul(attrs, ' ');
 670                 if (len == space - attrs && !strncmp(attrs, attr, len))
 671                         return 1;
 672                 if (!*space)
 673                         return 0;
 674                 attrs = space + 1;
 675         }
 676 }
 677
 678 static struct ref *get_refs_list(struct transport *transport, int for_push)
 679 {
 680         struct helper_data *data = transport->data;
 681         struct child_process *helper;
 682         struct ref *ret = NULL;
 683         struct ref **tail = &ret;
 684         struct ref *posn;
 685         struct strbuf buf = STRBUF_INIT;
 686
 687         helper = get_helper(transport);
 688
 689         if (process_connect(transport, for_push)) {
 690                 do_take_over(transport);
 691                 return transport->get_refs_list(transport, for_push);
 692         }
 693
 694         if (data->push && for_push)
 695                 write_str_in_full(helper->in, "list for-push\n");
 696         else
 697                 write_str_in_full(helper->in, "list\n");
 698
 699         while (1) {
 700                 char *eov, *eon;
 701                 recvline(data, &buf);
 702
 703                 if (!*buf.buf)
 704                         break;
 705
 706                 eov = strchr(buf.buf, ' ');
 707                 if (!eov)
 708                         die("Malformed response in ref list: %s", buf.buf);
 709                 eon = strchr(eov + 1, ' ');
 710                 *eov = '\0';
 711                 if (eon)
 712                         *eon = '\0';
 713                 *tail = alloc_ref(eov + 1);
 714                 if (buf.buf[0] == '@')
 715                         (*tail)->symref = xstrdup(buf.buf + 1);
 716                 else if (buf.buf[0] != '?')
 717                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 718                 if (eon) {
 719                         if (has_attribute(eon + 1, "unchanged")) {
 720                                 (*tail)->status |= REF_STATUS_UPTODATE;
 721                                 read_ref((*tail)->name, (*tail)->old_sha1);
 722                         }
 723                 }
 724                 tail = &((*tail)->next);
 725         }
 726         if (debug)
 727                 fprintf(stderr, "Debug: Read ref listing.\n");
 728         strbuf_release(&buf);
 729
 730         for (posn = ret; posn; posn = posn->next)
 731                 resolve_remote_symref(posn, ret);
 732
 733         return ret;
 734 }
 735
 736 int transport_helper_init(struct transport *transport, const char *name)
 737 {
 738         struct helper_data *data = xcalloc(sizeof(*data), 1);
 739         data->name = name;
 740
 741         if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
 742                 debug = 1;
 743
 744         transport->data = data;
 745         transport->set_option = set_helper_option;
 746         transport->get_refs_list = get_refs_list;
 747         transport->fetch = fetch;
 748         transport->push_refs = push_refs;
 749         transport->disconnect = release_helper;
 750         transport->connect = connect_helper;
 751         transport->smart_options = &(data->transport_options);
 752         return 0;
 753 }