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
 283         set_helper_option(t, "progress", t->progress ? "true" : "false");
 284
 285         n = snprintf(buf, sizeof(buf), "%d", v + 1);
 286         if (n >= sizeof(buf))
 287                 die("impossibly large verbosity value");
 288         set_helper_option(t, "verbosity", buf);
 289 }
 290
 291 static int release_helper(struct transport *transport)
 292 {
 293         struct helper_data *data = transport->data;
 294         free_refspec(data->refspec_nr, data->refspecs);
 295         data->refspecs = NULL;
 296         disconnect_helper(transport);
 297         free(transport->data);
 298         return 0;
 299 }
 300
 301 static int fetch_with_fetch(struct transport *transport,
 302                             int nr_heads, struct ref **to_fetch)
 303 {
 304         struct helper_data *data = transport->data;
 305         int i;
 306         struct strbuf buf = STRBUF_INIT;
 307
 308         standard_options(transport);
 309
 310         for (i = 0; i < nr_heads; i++) {
 311                 const struct ref *posn = to_fetch[i];
 312                 if (posn->status & REF_STATUS_UPTODATE)
 313                         continue;
 314
 315                 strbuf_addf(&buf, "fetch %s %s\n",
 316                             sha1_to_hex(posn->old_sha1), posn->name);
 317         }
 318
 319         strbuf_addch(&buf, '\n');
 320         sendline(data, &buf);
 321
 322         while (1) {
 323                 recvline(data, &buf);
 324
 325                 if (!prefixcmp(buf.buf, "lock ")) {
 326                         const char *name = buf.buf + 5;
 327                         if (transport->pack_lockfile)
 328                                 warning("%s also locked %s", data->name, name);
 329                         else
 330                                 transport->pack_lockfile = xstrdup(name);
 331                 }
 332                 else if (!buf.len)
 333                         break;
 334                 else
 335                         warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 336         }
 337         strbuf_release(&buf);
 338         return 0;
 339 }
 340
 341 static int get_importer(struct transport *transport, struct child_process *fastimport)
 342 {
 343         struct child_process *helper = get_helper(transport);
 344         memset(fastimport, 0, sizeof(*fastimport));
 345         fastimport->in = helper->out;
 346         fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
 347         fastimport->argv[0] = "fast-import";
 348         fastimport->argv[1] = "--quiet";
 349
 350         fastimport->git_cmd = 1;
 351         return start_command(fastimport);
 352 }
 353
 354 static int fetch_with_import(struct transport *transport,
 355                              int nr_heads, struct ref **to_fetch)
 356 {
 357         struct child_process fastimport;
 358         struct helper_data *data = transport->data;
 359         int i;
 360         struct ref *posn;
 361         struct strbuf buf = STRBUF_INIT;
 362
 363         get_helper(transport);
 364
 365         if (get_importer(transport, &fastimport))
 366                 die("Couldn't run fast-import");
 367
 368         for (i = 0; i < nr_heads; i++) {
 369                 posn = to_fetch[i];
 370                 if (posn->status & REF_STATUS_UPTODATE)
 371                         continue;
 372
 373                 strbuf_addf(&buf, "import %s\n", posn->name);
 374                 sendline(data, &buf);
 375                 strbuf_reset(&buf);
 376         }
 377         disconnect_helper(transport);
 378         finish_command(&fastimport);
 379         free(fastimport.argv);
 380         fastimport.argv = NULL;
 381
 382         for (i = 0; i < nr_heads; i++) {
 383                 char *private;
 384                 posn = to_fetch[i];
 385                 if (posn->status & REF_STATUS_UPTODATE)
 386                         continue;
 387                 if (data->refspecs)
 388                         private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
 389                 else
 390                         private = strdup(posn->name);
 391                 read_ref(private, posn->old_sha1);
 392                 free(private);
 393         }
 394         strbuf_release(&buf);
 395         return 0;
 396 }
 397
 398 static int process_connect_service(struct transport *transport,
 399                                    const char *name, const char *exec)
 400 {
 401         struct helper_data *data = transport->data;
 402         struct strbuf cmdbuf = STRBUF_INIT;
 403         struct child_process *helper;
 404         int r, duped, ret = 0;
 405         FILE *input;
 406
 407         helper = get_helper(transport);
 408
 409         /*
 410          * Yes, dup the pipe another time, as we need unbuffered version
 411          * of input pipe as FILE*. fclose() closes the underlying fd and
 412          * stream buffering only can be changed before first I/O operation
 413          * on it.
 414          */
 415         duped = dup(helper->out);
 416         if (duped < 0)
 417                 die_errno("Can't dup helper output fd");
 418         input = xfdopen(duped, "r");
 419         setvbuf(input, NULL, _IONBF, 0);
 420
 421         /*
 422          * Handle --upload-pack and friends. This is fire and forget...
 423          * just warn if it fails.
 424          */
 425         if (strcmp(name, exec)) {
 426                 r = set_helper_option(transport, "servpath", exec);
 427                 if (r > 0)
 428                         warning("Setting remote service path not supported by protocol.");
 429                 else if (r < 0)
 430                         warning("Invalid remote service path.");
 431         }
 432
 433         if (data->connect)
 434                 strbuf_addf(&cmdbuf, "connect %s\n", name);
 435         else
 436                 goto exit;
 437
 438         sendline(data, &cmdbuf);
 439         recvline_fh(input, &cmdbuf);
 440         if (!strcmp(cmdbuf.buf, "")) {
 441                 data->no_disconnect_req = 1;
 442                 if (debug)
 443                         fprintf(stderr, "Debug: Smart transport connection "
 444                                 "ready.\n");
 445                 ret = 1;
 446         } else if (!strcmp(cmdbuf.buf, "fallback")) {
 447                 if (debug)
 448                         fprintf(stderr, "Debug: Falling back to dumb "
 449                                 "transport.\n");
 450         } else
 451                 die("Unknown response to connect: %s",
 452                         cmdbuf.buf);
 453
 454 exit:
 455         fclose(input);
 456         return ret;
 457 }
 458
 459 static int process_connect(struct transport *transport,
 460                                      int for_push)
 461 {
 462         struct helper_data *data = transport->data;
 463         const char *name;
 464         const char *exec;
 465
 466         name = for_push ? "git-receive-pack" : "git-upload-pack";
 467         if (for_push)
 468                 exec = data->transport_options.receivepack;
 469         else
 470                 exec = data->transport_options.uploadpack;
 471
 472         return process_connect_service(transport, name, exec);
 473 }
 474
 475 static int connect_helper(struct transport *transport, const char *name,
 476                    const char *exec, int fd[2])
 477 {
 478         struct helper_data *data = transport->data;
 479
 480         /* Get_helper so connect is inited. */
 481         get_helper(transport);
 482         if (!data->connect)
 483                 die("Operation not supported by protocol.");
 484
 485         if (!process_connect_service(transport, name, exec))
 486                 die("Can't connect to subservice %s.", name);
 487
 488         fd[0] = data->helper->out;
 489         fd[1] = data->helper->in;
 490         return 0;
 491 }
 492
 493 static int fetch(struct transport *transport,
 494                  int nr_heads, struct ref **to_fetch)
 495 {
 496         struct helper_data *data = transport->data;
 497         int i, count;
 498
 499         if (process_connect(transport, 0)) {
 500                 do_take_over(transport);
 501                 return transport->fetch(transport, nr_heads, to_fetch);
 502         }
 503
 504         count = 0;
 505         for (i = 0; i < nr_heads; i++)
 506                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 507                         count++;
 508
 509         if (!count)
 510                 return 0;
 511
 512         if (data->fetch)
 513                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 514
 515         if (data->import)
 516                 return fetch_with_import(transport, nr_heads, to_fetch);
 517
 518         return -1;
 519 }
 520
 521 static int push_refs(struct transport *transport,
 522                 struct ref *remote_refs, int flags)
 523 {
 524         int force_all = flags & TRANSPORT_PUSH_FORCE;
 525         int mirror = flags & TRANSPORT_PUSH_MIRROR;
 526         struct helper_data *data = transport->data;
 527         struct strbuf buf = STRBUF_INIT;
 528         struct child_process *helper;
 529         struct ref *ref;
 530
 531         if (process_connect(transport, 1)) {
 532                 do_take_over(transport);
 533                 return transport->push_refs(transport, remote_refs, flags);
 534         }
 535
 536         if (!remote_refs) {
 537                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 538                         "Perhaps you should specify a branch such as 'master'.\n");
 539                 return 0;
 540         }
 541
 542         helper = get_helper(transport);
 543         if (!data->push)
 544                 return 1;
 545
 546         for (ref = remote_refs; ref; ref = ref->next) {
 547                 if (!ref->peer_ref && !mirror)
 548                         continue;
 549
 550                 /* Check for statuses set by set_ref_status_for_push() */
 551                 switch (ref->status) {
 552                 case REF_STATUS_REJECT_NONFASTFORWARD:
 553                 case REF_STATUS_UPTODATE:
 554                         continue;
 555                 default:
 556                         ; /* do nothing */
 557                 }
 558
 559                 if (force_all)
 560                         ref->force = 1;
 561
 562                 strbuf_addstr(&buf, "push ");
 563                 if (!ref->deletion) {
 564                         if (ref->force)
 565                                 strbuf_addch(&buf, '+');
 566                         if (ref->peer_ref)
 567                                 strbuf_addstr(&buf, ref->peer_ref->name);
 568                         else
 569                                 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
 570                 }
 571                 strbuf_addch(&buf, ':');
 572                 strbuf_addstr(&buf, ref->name);
 573                 strbuf_addch(&buf, '\n');
 574         }
 575         if (buf.len == 0)
 576                 return 0;
 577
 578         standard_options(transport);
 579
 580         if (flags & TRANSPORT_PUSH_DRY_RUN) {
 581                 if (set_helper_option(transport, "dry-run", "true") != 0)
 582                         die("helper %s does not support dry-run", data->name);
 583         }
 584
 585         strbuf_addch(&buf, '\n');
 586         sendline(data, &buf);
 587
 588         ref = remote_refs;
 589         while (1) {
 590                 char *refname, *msg;
 591                 int status;
 592
 593                 recvline(data, &buf);
 594                 if (!buf.len)
 595                         break;
 596
 597                 if (!prefixcmp(buf.buf, "ok ")) {
 598                         status = REF_STATUS_OK;
 599                         refname = buf.buf + 3;
 600                 } else if (!prefixcmp(buf.buf, "error ")) {
 601                         status = REF_STATUS_REMOTE_REJECT;
 602                         refname = buf.buf + 6;
 603                 } else
 604                         die("expected ok/error, helper said '%s'\n", buf.buf);
 605
 606                 msg = strchr(refname, ' ');
 607                 if (msg) {
 608                         struct strbuf msg_buf = STRBUF_INIT;
 609                         const char *end;
 610
 611                         *msg++ = '\0';
 612                         if (!unquote_c_style(&msg_buf, msg, &end))
 613                                 msg = strbuf_detach(&msg_buf, NULL);
 614                         else
 615                                 msg = xstrdup(msg);
 616                         strbuf_release(&msg_buf);
 617
 618                         if (!strcmp(msg, "no match")) {
 619                                 status = REF_STATUS_NONE;
 620                                 free(msg);
 621                                 msg = NULL;
 622                         }
 623                         else if (!strcmp(msg, "up to date")) {
 624                                 status = REF_STATUS_UPTODATE;
 625                                 free(msg);
 626                                 msg = NULL;
 627                         }
 628                         else if (!strcmp(msg, "non-fast forward")) {
 629                                 status = REF_STATUS_REJECT_NONFASTFORWARD;
 630                                 free(msg);
 631                                 msg = NULL;
 632                         }
 633                 }
 634
 635                 if (ref)
 636                         ref = find_ref_by_name(ref, refname);
 637                 if (!ref)
 638                         ref = find_ref_by_name(remote_refs, refname);
 639                 if (!ref) {
 640                         warning("helper reported unexpected status of %s", refname);
 641                         continue;
 642                 }
 643
 644                 if (ref->status != REF_STATUS_NONE) {
 645                         /*
 646                          * Earlier, the ref was marked not to be pushed, so ignore the ref
 647                          * status reported by the remote helper if the latter is 'no match'.
 648                          */
 649                         if (status == REF_STATUS_NONE)
 650                                 continue;
 651                 }
 652
 653                 ref->status = status;
 654                 ref->remote_status = msg;
 655         }
 656         strbuf_release(&buf);
 657         return 0;
 658 }
 659
 660 static int has_attribute(const char *attrs, const char *attr) {
 661         int len;
 662         if (!attrs)
 663                 return 0;
 664
 665         len = strlen(attr);
 666         for (;;) {
 667                 const char *space = strchrnul(attrs, ' ');
 668                 if (len == space - attrs && !strncmp(attrs, attr, len))
 669                         return 1;
 670                 if (!*space)
 671                         return 0;
 672                 attrs = space + 1;
 673         }
 674 }
 675
 676 static struct ref *get_refs_list(struct transport *transport, int for_push)
 677 {
 678         struct helper_data *data = transport->data;
 679         struct child_process *helper;
 680         struct ref *ret = NULL;
 681         struct ref **tail = &ret;
 682         struct ref *posn;
 683         struct strbuf buf = STRBUF_INIT;
 684
 685         helper = get_helper(transport);
 686
 687         if (process_connect(transport, for_push)) {
 688                 do_take_over(transport);
 689                 return transport->get_refs_list(transport, for_push);
 690         }
 691
 692         if (data->push && for_push)
 693                 write_str_in_full(helper->in, "list for-push\n");
 694         else
 695                 write_str_in_full(helper->in, "list\n");
 696
 697         while (1) {
 698                 char *eov, *eon;
 699                 recvline(data, &buf);
 700
 701                 if (!*buf.buf)
 702                         break;
 703
 704                 eov = strchr(buf.buf, ' ');
 705                 if (!eov)
 706                         die("Malformed response in ref list: %s", buf.buf);
 707                 eon = strchr(eov + 1, ' ');
 708                 *eov = '\0';
 709                 if (eon)
 710                         *eon = '\0';
 711                 *tail = alloc_ref(eov + 1);
 712                 if (buf.buf[0] == '@')
 713                         (*tail)->symref = xstrdup(buf.buf + 1);
 714                 else if (buf.buf[0] != '?')
 715                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 716                 if (eon) {
 717                         if (has_attribute(eon + 1, "unchanged")) {
 718                                 (*tail)->status |= REF_STATUS_UPTODATE;
 719                                 read_ref((*tail)->name, (*tail)->old_sha1);
 720                         }
 721                 }
 722                 tail = &((*tail)->next);
 723         }
 724         if (debug)
 725                 fprintf(stderr, "Debug: Read ref listing.\n");
 726         strbuf_release(&buf);
 727
 728         for (posn = ret; posn; posn = posn->next)
 729                 resolve_remote_symref(posn, ret);
 730
 731         return ret;
 732 }
 733
 734 int transport_helper_init(struct transport *transport, const char *name)
 735 {
 736         struct helper_data *data = xcalloc(sizeof(*data), 1);
 737         data->name = name;
 738
 739         if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
 740                 debug = 1;
 741
 742         transport->data = data;
 743         transport->set_option = set_helper_option;
 744         transport->get_refs_list = get_refs_list;
 745         transport->fetch = fetch;
 746         transport->push_refs = push_refs;
 747         transport->disconnect = release_helper;
 748         transport->connect = connect_helper;
 749         transport->smart_options = &(data->transport_options);
 750         return 0;
 751 }