git.oblomov.eu Git - git/blob - 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 #include "string-list.h"
  11
  12 static int debug;
  13
  14 struct helper_data
  15 {
  16         const char *name;
  17         struct child_process *helper;
  18         FILE *out;
  19         unsigned fetch : 1,
  20                 import : 1,
  21                 export : 1,
  22                 option : 1,
  23                 push : 1,
  24                 connect : 1,
  25                 no_disconnect_req : 1;
  26         char *export_marks;
  27         char *import_marks;
  28         /* These go from remote name (as in "list") to private name */
  29         struct refspec *refspecs;
  30         int refspec_nr;
  31         /* Transport options for fetch-pack/send-pack (should one of
  32          * those be invoked).
  33          */
  34         struct git_transport_options transport_options;
  35 };
  36
  37 static void sendline(struct helper_data *helper, struct strbuf *buffer)
  38 {
  39         if (debug)
  40                 fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
  41         if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
  42                 != buffer->len)
  43                 die_errno("Full write to remote helper failed");
  44 }
  45
  46 static int recvline_fh(FILE *helper, struct strbuf *buffer)
  47 {
  48         strbuf_reset(buffer);
  49         if (debug)
  50                 fprintf(stderr, "Debug: Remote helper: Waiting...\n");
  51         if (strbuf_getline(buffer, helper, '\n') == EOF) {
  52                 if (debug)
  53                         fprintf(stderr, "Debug: Remote helper quit.\n");
  54                 exit(128);
  55         }
  56
  57         if (debug)
  58                 fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
  59         return 0;
  60 }
  61
  62 static int recvline(struct helper_data *helper, struct strbuf *buffer)
  63 {
  64         return recvline_fh(helper->out, buffer);
  65 }
  66
  67 static void xchgline(struct helper_data *helper, struct strbuf *buffer)
  68 {
  69         sendline(helper, buffer);
  70         recvline(helper, buffer);
  71 }
  72
  73 static void write_constant(int fd, const char *str)
  74 {
  75         if (debug)
  76                 fprintf(stderr, "Debug: Remote helper: -> %s", str);
  77         if (write_in_full(fd, str, strlen(str)) != strlen(str))
  78                 die_errno("Full write to remote helper failed");
  79 }
  80
  81 const char *remove_ext_force(const char *url)
  82 {
  83         if (url) {
  84                 const char *colon = strchr(url, ':');
  85                 if (colon && colon[1] == ':')
  86                         return colon + 2;
  87         }
  88         return url;
  89 }
  90
  91 static void do_take_over(struct transport *transport)
  92 {
  93         struct helper_data *data;
  94         data = (struct helper_data *)transport->data;
  95         transport_take_over(transport, data->helper);
  96         fclose(data->out);
  97         free(data);
  98 }
  99
 100 static struct child_process *get_helper(struct transport *transport)
 101 {
 102         struct helper_data *data = transport->data;
 103         struct strbuf buf = STRBUF_INIT;
 104         struct child_process *helper;
 105         const char **refspecs = NULL;
 106         int refspec_nr = 0;
 107         int refspec_alloc = 0;
 108         int duped;
 109         int code;
 110
 111         if (data->helper)
 112                 return data->helper;
 113
 114         helper = xcalloc(1, sizeof(*helper));
 115         helper->in = -1;
 116         helper->out = -1;
 117         helper->err = 0;
 118         helper->argv = xcalloc(4, sizeof(*helper->argv));
 119         strbuf_addf(&buf, "git-remote-%s", data->name);
 120         helper->argv[0] = strbuf_detach(&buf, NULL);
 121         helper->argv[1] = transport->remote->name;
 122         helper->argv[2] = remove_ext_force(transport->url);
 123         helper->git_cmd = 0;
 124         helper->silent_exec_failure = 1;
 125         code = start_command(helper);
 126         if (code < 0 && errno == ENOENT)
 127                 die("Unable to find remote helper for '%s'", data->name);
 128         else if (code != 0)
 129                 exit(code);
 130
 131         data->helper = helper;
 132         data->no_disconnect_req = 0;
 133
 134         /*
 135          * Open the output as FILE* so strbuf_getline() can be used.
 136          * Do this with duped fd because fclose() will close the fd,
 137          * and stuff like taking over will require the fd to remain.
 138          */
 139         duped = dup(helper->out);
 140         if (duped < 0)
 141                 die_errno("Can't dup helper output fd");
 142         data->out = xfdopen(duped, "r");
 143
 144         write_constant(helper->in, "capabilities\n");
 145
 146         while (1) {
 147                 const char *capname;
 148                 int mandatory = 0;
 149                 recvline(data, &buf);
 150
 151                 if (!*buf.buf)
 152                         break;
 153
 154                 if (*buf.buf == '*') {
 155                         capname = buf.buf + 1;
 156                         mandatory = 1;
 157                 } else
 158                         capname = buf.buf;
 159
 160                 if (debug)
 161                         fprintf(stderr, "Debug: Got cap %s\n", capname);
 162                 if (!strcmp(capname, "fetch"))
 163                         data->fetch = 1;
 164                 else if (!strcmp(capname, "option"))
 165                         data->option = 1;
 166                 else if (!strcmp(capname, "push"))
 167                         data->push = 1;
 168                 else if (!strcmp(capname, "import"))
 169                         data->import = 1;
 170                 else if (!strcmp(capname, "export"))
 171                         data->export = 1;
 172                 else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
 173                         ALLOC_GROW(refspecs,
 174                                    refspec_nr + 1,
 175                                    refspec_alloc);
 176                         refspecs[refspec_nr++] = strdup(capname + strlen("refspec "));
 177                 } else if (!strcmp(capname, "connect")) {
 178                         data->connect = 1;
 179                 } else if (!strcmp(capname, "gitdir")) {
 180                         struct strbuf gitdir = STRBUF_INIT;
 181                         strbuf_addf(&gitdir, "gitdir %s\n", get_git_dir());
 182                         sendline(data, &gitdir);
 183                         strbuf_release(&gitdir);
 184                 } else if (!prefixcmp(capname, "export-marks ")) {
 185                         struct strbuf arg = STRBUF_INIT;
 186                         strbuf_addstr(&arg, "--export-marks=");
 187                         strbuf_addstr(&arg, capname + strlen("export-marks "));
 188                         data->export_marks = strbuf_detach(&arg, NULL);
 189                 } else if (!prefixcmp(capname, "import-marks")) {
 190                         struct strbuf arg = STRBUF_INIT;
 191                         strbuf_addstr(&arg, "--import-marks=");
 192                         strbuf_addstr(&arg, capname + strlen("import-marks "));
 193                         data->import_marks = strbuf_detach(&arg, NULL);
 194                 } else if (mandatory) {
 195                         die("Unknown mandatory capability %s. This remote "
 196                             "helper probably needs newer version of Git.\n",
 197                             capname);
 198                 }
 199         }
 200         if (refspecs) {
 201                 int i;
 202                 data->refspec_nr = refspec_nr;
 203                 data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
 204                 for (i = 0; i < refspec_nr; i++) {
 205                         free((char *)refspecs[i]);
 206                 }
 207                 free(refspecs);
 208         }
 209         strbuf_release(&buf);
 210         if (debug)
 211                 fprintf(stderr, "Debug: Capabilities complete.\n");
 212         return data->helper;
 213 }
 214
 215 static int disconnect_helper(struct transport *transport)
 216 {
 217         struct helper_data *data = transport->data;
 218         struct strbuf buf = STRBUF_INIT;
 219         int res = 0;
 220
 221         if (data->helper) {
 222                 if (debug)
 223                         fprintf(stderr, "Debug: Disconnecting.\n");
 224                 if (!data->no_disconnect_req) {
 225                         strbuf_addf(&buf, "\n");
 226                         sendline(data, &buf);
 227                 }
 228                 close(data->helper->in);
 229                 close(data->helper->out);
 230                 fclose(data->out);
 231                 res = finish_command(data->helper);
 232                 free((char *)data->helper->argv[0]);
 233                 free(data->helper->argv);
 234                 free(data->helper);
 235                 data->helper = NULL;
 236         }
 237         return res;
 238 }
 239
 240 static const char *unsupported_options[] = {
 241         TRANS_OPT_UPLOADPACK,
 242         TRANS_OPT_RECEIVEPACK,
 243         TRANS_OPT_THIN,
 244         TRANS_OPT_KEEP
 245         };
 246 static const char *boolean_options[] = {
 247         TRANS_OPT_THIN,
 248         TRANS_OPT_KEEP,
 249         TRANS_OPT_FOLLOWTAGS
 250         };
 251
 252 static int set_helper_option(struct transport *transport,
 253                           const char *name, const char *value)
 254 {
 255         struct helper_data *data = transport->data;
 256         struct strbuf buf = STRBUF_INIT;
 257         int i, ret, is_bool = 0;
 258
 259         get_helper(transport);
 260
 261         if (!data->option)
 262                 return 1;
 263
 264         for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
 265                 if (!strcmp(name, unsupported_options[i]))
 266                         return 1;
 267         }
 268
 269         for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
 270                 if (!strcmp(name, boolean_options[i])) {
 271                         is_bool = 1;
 272                         break;
 273                 }
 274         }
 275
 276         strbuf_addf(&buf, "option %s ", name);
 277         if (is_bool)
 278                 strbuf_addstr(&buf, value ? "true" : "false");
 279         else
 280                 quote_c_style(value, &buf, NULL, 0);
 281         strbuf_addch(&buf, '\n');
 282
 283         xchgline(data, &buf);
 284
 285         if (!strcmp(buf.buf, "ok"))
 286                 ret = 0;
 287         else if (!prefixcmp(buf.buf, "error")) {
 288                 ret = -1;
 289         } else if (!strcmp(buf.buf, "unsupported"))
 290                 ret = 1;
 291         else {
 292                 warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 293                 ret = 1;
 294         }
 295         strbuf_release(&buf);
 296         return ret;
 297 }
 298
 299 static void standard_options(struct transport *t)
 300 {
 301         char buf[16];
 302         int n;
 303         int v = t->verbose;
 304
 305         set_helper_option(t, "progress", t->progress ? "true" : "false");
 306
 307         n = snprintf(buf, sizeof(buf), "%d", v + 1);
 308         if (n >= sizeof(buf))
 309                 die("impossibly large verbosity value");
 310         set_helper_option(t, "verbosity", buf);
 311 }
 312
 313 static int release_helper(struct transport *transport)
 314 {
 315         int res = 0;
 316         struct helper_data *data = transport->data;
 317         free_refspec(data->refspec_nr, data->refspecs);
 318         data->refspecs = NULL;
 319         res = disconnect_helper(transport);
 320         free(transport->data);
 321         return res;
 322 }
 323
 324 static int fetch_with_fetch(struct transport *transport,
 325                             int nr_heads, struct ref **to_fetch)
 326 {
 327         struct helper_data *data = transport->data;
 328         int i;
 329         struct strbuf buf = STRBUF_INIT;
 330
 331         standard_options(transport);
 332
 333         for (i = 0; i < nr_heads; i++) {
 334                 const struct ref *posn = to_fetch[i];
 335                 if (posn->status & REF_STATUS_UPTODATE)
 336                         continue;
 337
 338                 strbuf_addf(&buf, "fetch %s %s\n",
 339                             sha1_to_hex(posn->old_sha1), posn->name);
 340         }
 341
 342         strbuf_addch(&buf, '\n');
 343         sendline(data, &buf);
 344
 345         while (1) {
 346                 recvline(data, &buf);
 347
 348                 if (!prefixcmp(buf.buf, "lock ")) {
 349                         const char *name = buf.buf + 5;
 350                         if (transport->pack_lockfile)
 351                                 warning("%s also locked %s", data->name, name);
 352                         else
 353                                 transport->pack_lockfile = xstrdup(name);
 354                 }
 355                 else if (!buf.len)
 356                         break;
 357                 else
 358                         warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 359         }
 360         strbuf_release(&buf);
 361         return 0;
 362 }
 363
 364 static int get_importer(struct transport *transport, struct child_process *fastimport)
 365 {
 366         struct child_process *helper = get_helper(transport);
 367         memset(fastimport, 0, sizeof(*fastimport));
 368         fastimport->in = helper->out;
 369         fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
 370         fastimport->argv[0] = "fast-import";
 371         fastimport->argv[1] = "--quiet";
 372
 373         fastimport->git_cmd = 1;
 374         return start_command(fastimport);
 375 }
 376
 377 static int get_exporter(struct transport *transport,
 378                         struct child_process *fastexport,
 379                         struct string_list *revlist_args)
 380 {
 381         struct helper_data *data = transport->data;
 382         struct child_process *helper = get_helper(transport);
 383         int argc = 0, i;
 384         memset(fastexport, 0, sizeof(*fastexport));
 385
 386         /* we need to duplicate helper->in because we want to use it after
 387          * fastexport is done with it. */
 388         fastexport->out = dup(helper->in);
 389         fastexport->argv = xcalloc(6 + revlist_args->nr, sizeof(*fastexport->argv));
 390         fastexport->argv[argc++] = "fast-export";
 391         fastexport->argv[argc++] = "--use-done-feature";
 392         if (data->export_marks)
 393                 fastexport->argv[argc++] = data->export_marks;
 394         if (data->import_marks)
 395                 fastexport->argv[argc++] = data->import_marks;
 396
 397         for (i = 0; i < revlist_args->nr; i++)
 398                 fastexport->argv[argc++] = revlist_args->items[i].string;
 399
 400         fastexport->argv[argc++] = "--";
 401
 402         fastexport->git_cmd = 1;
 403         return start_command(fastexport);
 404 }
 405
 406 static int fetch_with_import(struct transport *transport,
 407                              int nr_heads, struct ref **to_fetch)
 408 {
 409         struct child_process fastimport;
 410         struct helper_data *data = transport->data;
 411         int i;
 412         struct ref *posn;
 413         struct strbuf buf = STRBUF_INIT;
 414
 415         get_helper(transport);
 416
 417         if (get_importer(transport, &fastimport))
 418                 die("Couldn't run fast-import");
 419
 420         write_constant(data->helper->in, "import\n");
 421
 422         for (i = 0; i < nr_heads; i++) {
 423                 posn = to_fetch[i];
 424                 if (posn->status & REF_STATUS_UPTODATE)
 425                         continue;
 426
 427                 strbuf_addf(&buf, "%s\n", posn->name);
 428                 sendline(data, &buf);
 429                 strbuf_reset(&buf);
 430         }
 431
 432         write_constant(data->helper->in, "\n");
 433
 434         if (finish_command(&fastimport))
 435                 die("Error while running fast-import");
 436         free(fastimport.argv);
 437         fastimport.argv = NULL;
 438
 439         for (i = 0; i < nr_heads; i++) {
 440                 char *private;
 441                 posn = to_fetch[i];
 442                 if (posn->status & REF_STATUS_UPTODATE)
 443                         continue;
 444                 if (data->refspecs)
 445                         private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
 446                 else
 447                         private = strdup(posn->name);
 448                 read_ref(private, posn->old_sha1);
 449                 free(private);
 450         }
 451         strbuf_release(&buf);
 452         return 0;
 453 }
 454
 455 static int process_connect_service(struct transport *transport,
 456                                    const char *name, const char *exec)
 457 {
 458         struct helper_data *data = transport->data;
 459         struct strbuf cmdbuf = STRBUF_INIT;
 460         struct child_process *helper;
 461         int r, duped, ret = 0;
 462         FILE *input;
 463
 464         helper = get_helper(transport);
 465
 466         /*
 467          * Yes, dup the pipe another time, as we need unbuffered version
 468          * of input pipe as FILE*. fclose() closes the underlying fd and
 469          * stream buffering only can be changed before first I/O operation
 470          * on it.
 471          */
 472         duped = dup(helper->out);
 473         if (duped < 0)
 474                 die_errno("Can't dup helper output fd");
 475         input = xfdopen(duped, "r");
 476         setvbuf(input, NULL, _IONBF, 0);
 477
 478         /*
 479          * Handle --upload-pack and friends. This is fire and forget...
 480          * just warn if it fails.
 481          */
 482         if (strcmp(name, exec)) {
 483                 r = set_helper_option(transport, "servpath", exec);
 484                 if (r > 0)
 485                         warning("Setting remote service path not supported by protocol.");
 486                 else if (r < 0)
 487                         warning("Invalid remote service path.");
 488         }
 489
 490         if (data->connect)
 491                 strbuf_addf(&cmdbuf, "connect %s\n", name);
 492         else
 493                 goto exit;
 494
 495         sendline(data, &cmdbuf);
 496         recvline_fh(input, &cmdbuf);
 497         if (!strcmp(cmdbuf.buf, "")) {
 498                 data->no_disconnect_req = 1;
 499                 if (debug)
 500                         fprintf(stderr, "Debug: Smart transport connection "
 501                                 "ready.\n");
 502                 ret = 1;
 503         } else if (!strcmp(cmdbuf.buf, "fallback")) {
 504                 if (debug)
 505                         fprintf(stderr, "Debug: Falling back to dumb "
 506                                 "transport.\n");
 507         } else
 508                 die("Unknown response to connect: %s",
 509                         cmdbuf.buf);
 510
 511 exit:
 512         fclose(input);
 513         return ret;
 514 }
 515
 516 static int process_connect(struct transport *transport,
 517                                      int for_push)
 518 {
 519         struct helper_data *data = transport->data;
 520         const char *name;
 521         const char *exec;
 522
 523         name = for_push ? "git-receive-pack" : "git-upload-pack";
 524         if (for_push)
 525                 exec = data->transport_options.receivepack;
 526         else
 527                 exec = data->transport_options.uploadpack;
 528
 529         return process_connect_service(transport, name, exec);
 530 }
 531
 532 static int connect_helper(struct transport *transport, const char *name,
 533                    const char *exec, int fd[2])
 534 {
 535         struct helper_data *data = transport->data;
 536
 537         /* Get_helper so connect is inited. */
 538         get_helper(transport);
 539         if (!data->connect)
 540                 die("Operation not supported by protocol.");
 541
 542         if (!process_connect_service(transport, name, exec))
 543                 die("Can't connect to subservice %s.", name);
 544
 545         fd[0] = data->helper->out;
 546         fd[1] = data->helper->in;
 547         return 0;
 548 }
 549
 550 static int fetch(struct transport *transport,
 551                  int nr_heads, struct ref **to_fetch)
 552 {
 553         struct helper_data *data = transport->data;
 554         int i, count;
 555
 556         if (process_connect(transport, 0)) {
 557                 do_take_over(transport);
 558                 return transport->fetch(transport, nr_heads, to_fetch);
 559         }
 560
 561         count = 0;
 562         for (i = 0; i < nr_heads; i++)
 563                 if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 564                         count++;
 565
 566         if (!count)
 567                 return 0;
 568
 569         if (data->fetch)
 570                 return fetch_with_fetch(transport, nr_heads, to_fetch);
 571
 572         if (data->import)
 573                 return fetch_with_import(transport, nr_heads, to_fetch);
 574
 575         return -1;
 576 }
 577
 578 static void push_update_refs_status(struct helper_data *data,
 579                                     struct ref *remote_refs);
 580
 581 static int push_refs_with_push(struct transport *transport,
 582                 struct ref *remote_refs, int flags)
 583 {
 584         int force_all = flags & TRANSPORT_PUSH_FORCE;
 585         int mirror = flags & TRANSPORT_PUSH_MIRROR;
 586         struct helper_data *data = transport->data;
 587         struct strbuf buf = STRBUF_INIT;
 588         struct child_process *helper;
 589         struct ref *ref;
 590
 591         helper = get_helper(transport);
 592         if (!data->push)
 593                 return 1;
 594
 595         for (ref = remote_refs; ref; ref = ref->next) {
 596                 if (!ref->peer_ref && !mirror)
 597                         continue;
 598
 599                 /* Check for statuses set by set_ref_status_for_push() */
 600                 switch (ref->status) {
 601                 case REF_STATUS_REJECT_NONFASTFORWARD:
 602                 case REF_STATUS_UPTODATE:
 603                         continue;
 604                 default:
 605                         ; /* do nothing */
 606                 }
 607
 608                 if (force_all)
 609                         ref->force = 1;
 610
 611                 strbuf_addstr(&buf, "push ");
 612                 if (!ref->deletion) {
 613                         if (ref->force)
 614                                 strbuf_addch(&buf, '+');
 615                         if (ref->peer_ref)
 616                                 strbuf_addstr(&buf, ref->peer_ref->name);
 617                         else
 618                                 strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
 619                 }
 620                 strbuf_addch(&buf, ':');
 621                 strbuf_addstr(&buf, ref->name);
 622                 strbuf_addch(&buf, '\n');
 623         }
 624         if (buf.len == 0)
 625                 return 0;
 626
 627         standard_options(transport);
 628
 629         if (flags & TRANSPORT_PUSH_DRY_RUN) {
 630                 if (set_helper_option(transport, "dry-run", "true") != 0)
 631                         die("helper %s does not support dry-run", data->name);
 632         }
 633
 634         strbuf_addch(&buf, '\n');
 635         sendline(data, &buf);
 636         strbuf_release(&buf);
 637
 638         push_update_refs_status(data, remote_refs);
 639         return 0;
 640 }
 641
 642 static void push_update_ref_status(struct strbuf *buf,
 643                                    struct ref *ref,
 644                                    struct ref *remote_refs)
 645 {
 646         char *refname, *msg;
 647         int status;
 648
 649         if (!prefixcmp(buf->buf, "ok ")) {
 650                 status = REF_STATUS_OK;
 651                 refname = buf->buf + 3;
 652         } else if (!prefixcmp(buf->buf, "error ")) {
 653                 status = REF_STATUS_REMOTE_REJECT;
 654                 refname = buf->buf + 6;
 655         } else
 656                 die("expected ok/error, helper said '%s'\n", buf->buf);
 657
 658         msg = strchr(refname, ' ');
 659         if (msg) {
 660                 struct strbuf msg_buf = STRBUF_INIT;
 661                 const char *end;
 662
 663                 *msg++ = '\0';
 664                 if (!unquote_c_style(&msg_buf, msg, &end))
 665                         msg = strbuf_detach(&msg_buf, NULL);
 666                 else
 667                         msg = xstrdup(msg);
 668                 strbuf_release(&msg_buf);
 669
 670                 if (!strcmp(msg, "no match")) {
 671                         status = REF_STATUS_NONE;
 672                         free(msg);
 673                         msg = NULL;
 674                 }
 675                 else if (!strcmp(msg, "up to date")) {
 676                         status = REF_STATUS_UPTODATE;
 677                         free(msg);
 678                         msg = NULL;
 679                 }
 680                 else if (!strcmp(msg, "non-fast forward")) {
 681                         status = REF_STATUS_REJECT_NONFASTFORWARD;
 682                         free(msg);
 683                         msg = NULL;
 684                 }
 685         }
 686
 687         if (ref)
 688                 ref = find_ref_by_name(ref, refname);
 689         if (!ref)
 690                 ref = find_ref_by_name(remote_refs, refname);
 691         if (!ref) {
 692                 warning("helper reported unexpected status of %s", refname);
 693                 return;
 694         }
 695
 696         if (ref->status != REF_STATUS_NONE) {
 697                 /*
 698                  * Earlier, the ref was marked not to be pushed, so ignore the ref
 699                  * status reported by the remote helper if the latter is 'no match'.
 700                  */
 701                 if (status == REF_STATUS_NONE)
 702                         return;
 703         }
 704
 705         ref->status = status;
 706         ref->remote_status = msg;
 707 }
 708
 709 static void push_update_refs_status(struct helper_data *data,
 710                                     struct ref *remote_refs)
 711 {
 712         struct strbuf buf = STRBUF_INIT;
 713         struct ref *ref = remote_refs;
 714         for (;;) {
 715                 recvline(data, &buf);
 716                 if (!buf.len)
 717                         break;
 718
 719                 push_update_ref_status(&buf, ref, remote_refs);
 720         }
 721         strbuf_release(&buf);
 722 }
 723
 724 static int push_refs_with_export(struct transport *transport,
 725                 struct ref *remote_refs, int flags)
 726 {
 727         struct ref *ref;
 728         struct child_process *helper, exporter;
 729         struct helper_data *data = transport->data;
 730         struct string_list revlist_args = STRING_LIST_INIT_NODUP;
 731         struct strbuf buf = STRBUF_INIT;
 732
 733         helper = get_helper(transport);
 734
 735         write_constant(helper->in, "export\n");
 736
 737         strbuf_reset(&buf);
 738
 739         for (ref = remote_refs; ref; ref = ref->next) {
 740                 char *private;
 741                 unsigned char sha1[20];
 742
 743                 // TODO: this can't be right
 744                 if (!data->refspecs)
 745                         continue;
 746
 747                 //warning("adding ref %s (%s)\n", ref->name, ref->peer_ref);
 748
 749                 strbuf_addf(&buf, "%s\n", ref->name);
 750                 sendline(data, &buf);
 751                 strbuf_reset(&buf);
 752
 753                 private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
 754                 if (private && !get_sha1(private, sha1)) {
 755                         strbuf_addf(&buf, "^%s", private);
 756                         string_list_append(&revlist_args, strbuf_detach(&buf, NULL));
 757                 }
 758
 759                 string_list_append(&revlist_args, ref->name);
 760
 761         }
 762
 763         write_constant(helper->in, "\n");
 764
 765         if (get_exporter(transport, &exporter, &revlist_args))
 766                 die("Couldn't run fast-export");
 767
 768         if(finish_command(&exporter))
 769                 die("Error while running fast-export");
 770         push_update_refs_status(data, remote_refs);
 771         return 0;
 772 }
 773
 774 static int push_refs(struct transport *transport,
 775                 struct ref *remote_refs, int flags)
 776 {
 777         struct helper_data *data = transport->data;
 778
 779         if (process_connect(transport, 1)) {
 780                 do_take_over(transport);
 781                 return transport->push_refs(transport, remote_refs, flags);
 782         }
 783
 784         if (!remote_refs) {
 785                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 786                         "Perhaps you should specify a branch such as 'master'.\n");
 787                 return 0;
 788         }
 789
 790         if (data->push)
 791                 return push_refs_with_push(transport, remote_refs, flags);
 792
 793         if (data->export)
 794                 return push_refs_with_export(transport, remote_refs, flags);
 795
 796         return -1;
 797 }
 798
 799
 800 static int has_attribute(const char *attrs, const char *attr) {
 801         int len;
 802         if (!attrs)
 803                 return 0;
 804
 805         len = strlen(attr);
 806         for (;;) {
 807                 const char *space = strchrnul(attrs, ' ');
 808                 if (len == space - attrs && !strncmp(attrs, attr, len))
 809                         return 1;
 810                 if (!*space)
 811                         return 0;
 812                 attrs = space + 1;
 813         }
 814 }
 815
 816 static struct ref *get_refs_list(struct transport *transport, int for_push)
 817 {
 818         struct helper_data *data = transport->data;
 819         struct child_process *helper;
 820         struct ref *ret = NULL;
 821         struct ref **tail = &ret;
 822         struct ref *posn;
 823         struct strbuf buf = STRBUF_INIT;
 824
 825         helper = get_helper(transport);
 826
 827         if (process_connect(transport, for_push)) {
 828                 do_take_over(transport);
 829                 return transport->get_refs_list(transport, for_push);
 830         }
 831
 832         if (data->push && for_push)
 833                 write_constant(helper->in, "list for-push\n");
 834         else
 835                 write_constant(helper->in, "list\n");
 836
 837         while (1) {
 838                 char *eov, *eon;
 839                 recvline(data, &buf);
 840
 841                 if (!*buf.buf)
 842                         break;
 843
 844                 eov = strchr(buf.buf, ' ');
 845                 if (!eov)
 846                         die("Malformed response in ref list: %s", buf.buf);
 847                 eon = strchr(eov + 1, ' ');
 848                 *eov = '\0';
 849                 if (eon)
 850                         *eon = '\0';
 851                 *tail = alloc_ref(eov + 1);
 852                 if (buf.buf[0] == '@')
 853                         (*tail)->symref = xstrdup(buf.buf + 1);
 854                 else if (buf.buf[0] != '?')
 855                         get_sha1_hex(buf.buf, (*tail)->old_sha1);
 856                 if (eon) {
 857                         if (has_attribute(eon + 1, "unchanged")) {
 858                                 (*tail)->status |= REF_STATUS_UPTODATE;
 859                                 read_ref((*tail)->name, (*tail)->old_sha1);
 860                         }
 861                 }
 862                 tail = &((*tail)->next);
 863         }
 864         if (debug)
 865                 fprintf(stderr, "Debug: Read ref listing.\n");
 866         strbuf_release(&buf);
 867
 868         for (posn = ret; posn; posn = posn->next)
 869                 resolve_remote_symref(posn, ret);
 870
 871         return ret;
 872 }
 873
 874 int transport_helper_init(struct transport *transport, const char *name)
 875 {
 876         struct helper_data *data = xcalloc(sizeof(*data), 1);
 877         data->name = name;
 878
 879         if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
 880                 debug = 1;
 881
 882         transport->data = data;
 883         transport->set_option = set_helper_option;
 884         transport->get_refs_list = get_refs_list;
 885         transport->fetch = fetch;
 886         transport->push_refs = push_refs;
 887         transport->disconnect = release_helper;
 888         transport->connect = connect_helper;
 889         transport->smart_options = &(data->transport_options);
 890         return 0;
 891 }