transport.c

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "run-command.h"
   4 #ifndef NO_CURL
   5 #include "http.h"
   6 #endif
   7 #include "pkt-line.h"
   8 #include "fetch-pack.h"
   9 #include "send-pack.h"
  10 #include "walker.h"
  11 #include "bundle.h"
  12 #include "dir.h"
  13 #include "refs.h"
  14
  15 /* rsync support */
  16
  17 /*
  18  * We copy packed-refs and refs/ into a temporary file, then read the
  19  * loose refs recursively (sorting whenever possible), and then inserting
  20  * those packed refs that are not yet in the list (not validating, but
  21  * assuming that the file is sorted).
  22  *
  23  * Appears refactoring this from refs.c is too cumbersome.
  24  */
  25
  26 static int str_cmp(const void *a, const void *b)
  27 {
  28         const char *s1 = a;
  29         const char *s2 = b;
  30
  31         return strcmp(s1, s2);
  32 }
  33
  34 /* path->buf + name_offset is expected to point to "refs/" */
  35
  36 static int read_loose_refs(struct strbuf *path, int name_offset,
  37                 struct ref **tail)
  38 {
  39         DIR *dir = opendir(path->buf);
  40         struct dirent *de;
  41         struct {
  42                 char **entries;
  43                 int nr, alloc;
  44         } list;
  45         int i, pathlen;
  46
  47         if (!dir)
  48                 return -1;
  49
  50         memset (&list, 0, sizeof(list));
  51
  52         while ((de = readdir(dir))) {
  53                 if (de->d_name[0] == '.' && (de->d_name[1] == '\0' ||
  54                                 (de->d_name[1] == '.' &&
  55                                  de->d_name[2] == '\0')))
  56                         continue;
  57                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  58                 list.entries[list.nr++] = xstrdup(de->d_name);
  59         }
  60         closedir(dir);
  61
  62         /* sort the list */
  63
  64         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  65
  66         pathlen = path->len;
  67         strbuf_addch(path, '/');
  68
  69         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  70                 strbuf_addstr(path, list.entries[i]);
  71                 if (read_loose_refs(path, name_offset, tail)) {
  72                         int fd = open(path->buf, O_RDONLY);
  73                         char buffer[40];
  74                         struct ref *next;
  75
  76                         if (fd < 0)
  77                                 continue;
  78                         next = alloc_ref(path->len - name_offset + 1);
  79                         if (read_in_full(fd, buffer, 40) != 40 ||
  80                                         get_sha1_hex(buffer, next->old_sha1)) {
  81                                 close(fd);
  82                                 free(next);
  83                                 continue;
  84                         }
  85                         close(fd);
  86                         strcpy(next->name, path->buf + name_offset);
  87                         (*tail)->next = next;
  88                         *tail = next;
  89                 }
  90         }
  91         strbuf_setlen(path, pathlen);
  92
  93         for (i = 0; i < list.nr; i++)
  94                 free(list.entries[i]);
  95         free(list.entries);
  96
  97         return 0;
  98 }
  99
 100 /* insert the packed refs for which no loose refs were found */
 101
 102 static void insert_packed_refs(const char *packed_refs, struct ref **list)
 103 {
 104         FILE *f = fopen(packed_refs, "r");
 105         static char buffer[PATH_MAX];
 106
 107         if (!f)
 108                 return;
 109
 110         for (;;) {
 111                 int cmp = cmp, len;
 112
 113                 if (!fgets(buffer, sizeof(buffer), f)) {
 114                         fclose(f);
 115                         return;
 116                 }
 117
 118                 if (hexval(buffer[0]) > 0xf)
 119                         continue;
 120                 len = strlen(buffer);
 121                 if (buffer[len - 1] == '\n')
 122                         buffer[--len] = '\0';
 123                 if (len < 41)
 124                         continue;
 125                 while ((*list)->next &&
 126                                 (cmp = strcmp(buffer + 41,
 127                                       (*list)->next->name)) > 0)
 128                         list = &(*list)->next;
 129                 if (!(*list)->next || cmp < 0) {
 130                         struct ref *next = alloc_ref(len - 40);
 131                         buffer[40] = '\0';
 132                         if (get_sha1_hex(buffer, next->old_sha1)) {
 133                                 warning ("invalid SHA-1: %s", buffer);
 134                                 free(next);
 135                                 continue;
 136                         }
 137                         strcpy(next->name, buffer + 41);
 138                         next->next = (*list)->next;
 139                         (*list)->next = next;
 140                         list = &(*list)->next;
 141                 }
 142         }
 143 }
 144
 145 static struct ref *get_refs_via_rsync(struct transport *transport)
 146 {
 147         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 148         struct ref dummy, *tail = &dummy;
 149         struct child_process rsync;
 150         const char *args[5];
 151         int temp_dir_len;
 152
 153         /* copy the refs to the temporary directory */
 154
 155         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 156         if (!mkdtemp(temp_dir.buf))
 157                 die ("Could not make temporary directory");
 158         temp_dir_len = temp_dir.len;
 159
 160         strbuf_addstr(&buf, transport->url);
 161         strbuf_addstr(&buf, "/refs");
 162
 163         memset(&rsync, 0, sizeof(rsync));
 164         rsync.argv = args;
 165         rsync.stdout_to_stderr = 1;
 166         args[0] = "rsync";
 167         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 168         args[2] = buf.buf;
 169         args[3] = temp_dir.buf;
 170         args[4] = NULL;
 171
 172         if (run_command(&rsync))
 173                 die ("Could not run rsync to get refs");
 174
 175         strbuf_reset(&buf);
 176         strbuf_addstr(&buf, transport->url);
 177         strbuf_addstr(&buf, "/packed-refs");
 178
 179         args[2] = buf.buf;
 180
 181         if (run_command(&rsync))
 182                 die ("Could not run rsync to get refs");
 183
 184         /* read the copied refs */
 185
 186         strbuf_addstr(&temp_dir, "/refs");
 187         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 188         strbuf_setlen(&temp_dir, temp_dir_len);
 189
 190         tail = &dummy;
 191         strbuf_addstr(&temp_dir, "/packed-refs");
 192         insert_packed_refs(temp_dir.buf, &tail);
 193         strbuf_setlen(&temp_dir, temp_dir_len);
 194
 195         if (remove_dir_recursively(&temp_dir, 0))
 196                 warning ("Error removing temporary directory %s.",
 197                                 temp_dir.buf);
 198
 199         strbuf_release(&buf);
 200         strbuf_release(&temp_dir);
 201
 202         return dummy.next;
 203 }
 204
 205 static int fetch_objs_via_rsync(struct transport *transport,
 206                                  int nr_objs, struct ref **to_fetch)
 207 {
 208         struct strbuf buf = STRBUF_INIT;
 209         struct child_process rsync;
 210         const char *args[8];
 211         int result;
 212
 213         strbuf_addstr(&buf, transport->url);
 214         strbuf_addstr(&buf, "/objects/");
 215
 216         memset(&rsync, 0, sizeof(rsync));
 217         rsync.argv = args;
 218         rsync.stdout_to_stderr = 1;
 219         args[0] = "rsync";
 220         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 221         args[2] = "--ignore-existing";
 222         args[3] = "--exclude";
 223         args[4] = "info";
 224         args[5] = buf.buf;
 225         args[6] = get_object_directory();
 226         args[7] = NULL;
 227
 228         /* NEEDSWORK: handle one level of alternates */
 229         result = run_command(&rsync);
 230
 231         strbuf_release(&buf);
 232
 233         return result;
 234 }
 235
 236 static int write_one_ref(const char *name, const unsigned char *sha1,
 237                 int flags, void *data)
 238 {
 239         struct strbuf *buf = data;
 240         int len = buf->len;
 241         FILE *f;
 242
 243         /* when called via for_each_ref(), flags is non-zero */
 244         if (flags && prefixcmp(name, "refs/heads/") &&
 245                         prefixcmp(name, "refs/tags/"))
 246                 return 0;
 247
 248         strbuf_addstr(buf, name);
 249         if (safe_create_leading_directories(buf->buf) ||
 250                         !(f = fopen(buf->buf, "w")) ||
 251                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 252                         fclose(f))
 253                 return error("problems writing temporary file %s", buf->buf);
 254         strbuf_setlen(buf, len);
 255         return 0;
 256 }
 257
 258 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 259                 int refspec_nr, const char **refspec)
 260 {
 261         int i;
 262
 263         for (i = 0; i < refspec_nr; i++) {
 264                 unsigned char sha1[20];
 265                 char *ref;
 266
 267                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 268                         return error("Could not get ref %s", refspec[i]);
 269
 270                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 271                         free(ref);
 272                         return -1;
 273                 }
 274                 free(ref);
 275         }
 276         return 0;
 277 }
 278
 279 static int rsync_transport_push(struct transport *transport,
 280                 int refspec_nr, const char **refspec, int flags)
 281 {
 282         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 283         int result = 0, i;
 284         struct child_process rsync;
 285         const char *args[10];
 286
 287         if (flags & TRANSPORT_PUSH_MIRROR)
 288                 return error("rsync transport does not support mirror mode");
 289
 290         /* first push the objects */
 291
 292         strbuf_addstr(&buf, transport->url);
 293         strbuf_addch(&buf, '/');
 294
 295         memset(&rsync, 0, sizeof(rsync));
 296         rsync.argv = args;
 297         rsync.stdout_to_stderr = 1;
 298         i = 0;
 299         args[i++] = "rsync";
 300         args[i++] = "-a";
 301         if (flags & TRANSPORT_PUSH_DRY_RUN)
 302                 args[i++] = "--dry-run";
 303         if (transport->verbose > 0)
 304                 args[i++] = "-v";
 305         args[i++] = "--ignore-existing";
 306         args[i++] = "--exclude";
 307         args[i++] = "info";
 308         args[i++] = get_object_directory();
 309         args[i++] = buf.buf;
 310         args[i++] = NULL;
 311
 312         if (run_command(&rsync))
 313                 return error("Could not push objects to %s", transport->url);
 314
 315         /* copy the refs to the temporary directory; they could be packed. */
 316
 317         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 318         if (!mkdtemp(temp_dir.buf))
 319                 die ("Could not make temporary directory");
 320         strbuf_addch(&temp_dir, '/');
 321
 322         if (flags & TRANSPORT_PUSH_ALL) {
 323                 if (for_each_ref(write_one_ref, &temp_dir))
 324                         return -1;
 325         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 326                 return -1;
 327
 328         i = 2;
 329         if (flags & TRANSPORT_PUSH_DRY_RUN)
 330                 args[i++] = "--dry-run";
 331         if (!(flags & TRANSPORT_PUSH_FORCE))
 332                 args[i++] = "--ignore-existing";
 333         args[i++] = temp_dir.buf;
 334         args[i++] = transport->url;
 335         args[i++] = NULL;
 336         if (run_command(&rsync))
 337                 result = error("Could not push to %s", transport->url);
 338
 339         if (remove_dir_recursively(&temp_dir, 0))
 340                 warning ("Could not remove temporary directory %s.",
 341                                 temp_dir.buf);
 342
 343         strbuf_release(&buf);
 344         strbuf_release(&temp_dir);
 345
 346         return result;
 347 }
 348
 349 /* Generic functions for using commit walkers */
 350
 351 static int fetch_objs_via_walker(struct transport *transport,
 352                                  int nr_objs, struct ref **to_fetch)
 353 {
 354         char *dest = xstrdup(transport->url);
 355         struct walker *walker = transport->data;
 356         char **objs = xmalloc(nr_objs * sizeof(*objs));
 357         int i;
 358
 359         walker->get_all = 1;
 360         walker->get_tree = 1;
 361         walker->get_history = 1;
 362         walker->get_verbosely = transport->verbose >= 0;
 363         walker->get_recover = 0;
 364
 365         for (i = 0; i < nr_objs; i++)
 366                 objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 367
 368         if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 369                 die("Fetch failed.");
 370
 371         for (i = 0; i < nr_objs; i++)
 372                 free(objs[i]);
 373         free(objs);
 374         free(dest);
 375         return 0;
 376 }
 377
 378 static int disconnect_walker(struct transport *transport)
 379 {
 380         struct walker *walker = transport->data;
 381         if (walker)
 382                 walker_free(walker);
 383         return 0;
 384 }
 385
 386 #ifndef NO_CURL
 387 static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 388 {
 389         const char **argv;
 390         int argc;
 391         int err;
 392
 393         if (flags & TRANSPORT_PUSH_MIRROR)
 394                 return error("http transport does not support mirror mode");
 395
 396         argv = xmalloc((refspec_nr + 11) * sizeof(char *));
 397         argv[0] = "http-push";
 398         argc = 1;
 399         if (flags & TRANSPORT_PUSH_ALL)
 400                 argv[argc++] = "--all";
 401         if (flags & TRANSPORT_PUSH_FORCE)
 402                 argv[argc++] = "--force";
 403         if (flags & TRANSPORT_PUSH_DRY_RUN)
 404                 argv[argc++] = "--dry-run";
 405         argv[argc++] = transport->url;
 406         while (refspec_nr--)
 407                 argv[argc++] = *refspec++;
 408         argv[argc] = NULL;
 409         err = run_command_v_opt(argv, RUN_GIT_CMD);
 410         switch (err) {
 411         case -ERR_RUN_COMMAND_FORK:
 412                 error("unable to fork for %s", argv[0]);
 413         case -ERR_RUN_COMMAND_EXEC:
 414                 error("unable to exec %s", argv[0]);
 415                 break;
 416         case -ERR_RUN_COMMAND_WAITPID:
 417         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 418         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 419         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 420                 error("%s died with strange error", argv[0]);
 421         }
 422         return !!err;
 423 }
 424
 425 static int missing__target(int code, int result)
 426 {
 427         return  /* file:// URL -- do we ever use one??? */
 428                 (result == CURLE_FILE_COULDNT_READ_FILE) ||
 429                 /* http:// and https:// URL */
 430                 (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 431                 /* ftp:// URL */
 432                 (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 433                 ;
 434 }
 435
 436 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 437
 438 static struct ref *get_refs_via_curl(struct transport *transport)
 439 {
 440         struct buffer buffer;
 441         char *data, *start, *mid;
 442         char *ref_name;
 443         char *refs_url;
 444         int i = 0;
 445
 446         struct active_request_slot *slot;
 447         struct slot_results results;
 448
 449         struct ref *refs = NULL;
 450         struct ref *ref = NULL;
 451         struct ref *last_ref = NULL;
 452
 453         data = xmalloc(4096);
 454         buffer.size = 4096;
 455         buffer.posn = 0;
 456         buffer.buffer = data;
 457
 458         refs_url = xmalloc(strlen(transport->url) + 11);
 459         sprintf(refs_url, "%s/info/refs", transport->url);
 460
 461         http_init();
 462
 463         slot = get_active_slot();
 464         slot->results = &results;
 465         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 466         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 467         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 468         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 469         if (start_active_slot(slot)) {
 470                 run_active_slot(slot);
 471                 if (results.curl_result != CURLE_OK) {
 472                         if (missing_target(&results)) {
 473                                 free(buffer.buffer);
 474                                 return NULL;
 475                         } else {
 476                                 free(buffer.buffer);
 477                                 error("%s", curl_errorstr);
 478                                 return NULL;
 479                         }
 480                 }
 481         } else {
 482                 free(buffer.buffer);
 483                 error("Unable to start request");
 484                 return NULL;
 485         }
 486
 487         http_cleanup();
 488
 489         data = buffer.buffer;
 490         start = NULL;
 491         mid = data;
 492         while (i < buffer.posn) {
 493                 if (!start)
 494                         start = &data[i];
 495                 if (data[i] == '\t')
 496                         mid = &data[i];
 497                 if (data[i] == '\n') {
 498                         data[i] = 0;
 499                         ref_name = mid + 1;
 500                         ref = xmalloc(sizeof(struct ref) +
 501                                       strlen(ref_name) + 1);
 502                         memset(ref, 0, sizeof(struct ref));
 503                         strcpy(ref->name, ref_name);
 504                         get_sha1_hex(start, ref->old_sha1);
 505                         if (!refs)
 506                                 refs = ref;
 507                         if (last_ref)
 508                                 last_ref->next = ref;
 509                         last_ref = ref;
 510                         start = NULL;
 511                 }
 512                 i++;
 513         }
 514
 515         free(buffer.buffer);
 516
 517         return refs;
 518 }
 519
 520 static int fetch_objs_via_curl(struct transport *transport,
 521                                  int nr_objs, struct ref **to_fetch)
 522 {
 523         if (!transport->data)
 524                 transport->data = get_http_walker(transport->url);
 525         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 526 }
 527
 528 #endif
 529
 530 struct bundle_transport_data {
 531         int fd;
 532         struct bundle_header header;
 533 };
 534
 535 static struct ref *get_refs_from_bundle(struct transport *transport)
 536 {
 537         struct bundle_transport_data *data = transport->data;
 538         struct ref *result = NULL;
 539         int i;
 540
 541         if (data->fd > 0)
 542                 close(data->fd);
 543         data->fd = read_bundle_header(transport->url, &data->header);
 544         if (data->fd < 0)
 545                 die ("Could not read bundle '%s'.", transport->url);
 546         for (i = 0; i < data->header.references.nr; i++) {
 547                 struct ref_list_entry *e = data->header.references.list + i;
 548                 struct ref *ref = alloc_ref(strlen(e->name) + 1);
 549                 hashcpy(ref->old_sha1, e->sha1);
 550                 strcpy(ref->name, e->name);
 551                 ref->next = result;
 552                 result = ref;
 553         }
 554         return result;
 555 }
 556
 557 static int fetch_refs_from_bundle(struct transport *transport,
 558                                int nr_heads, struct ref **to_fetch)
 559 {
 560         struct bundle_transport_data *data = transport->data;
 561         return unbundle(&data->header, data->fd);
 562 }
 563
 564 static int close_bundle(struct transport *transport)
 565 {
 566         struct bundle_transport_data *data = transport->data;
 567         if (data->fd > 0)
 568                 close(data->fd);
 569         free(data);
 570         return 0;
 571 }
 572
 573 struct git_transport_data {
 574         unsigned thin : 1;
 575         unsigned keep : 1;
 576         int depth;
 577         const char *uploadpack;
 578         const char *receivepack;
 579 };
 580
 581 static int set_git_option(struct transport *connection,
 582                           const char *name, const char *value)
 583 {
 584         struct git_transport_data *data = connection->data;
 585         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 586                 data->uploadpack = value;
 587                 return 0;
 588         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 589                 data->receivepack = value;
 590                 return 0;
 591         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 592                 data->thin = !!value;
 593                 return 0;
 594         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 595                 data->keep = !!value;
 596                 return 0;
 597         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 598                 if (!value)
 599                         data->depth = 0;
 600                 else
 601                         data->depth = atoi(value);
 602                 return 0;
 603         }
 604         return 1;
 605 }
 606
 607 static struct ref *get_refs_via_connect(struct transport *transport)
 608 {
 609         struct git_transport_data *data = transport->data;
 610         struct ref *refs;
 611         int fd[2];
 612         char *dest = xstrdup(transport->url);
 613         struct child_process *conn = git_connect(fd, dest, data->uploadpack, 0);
 614
 615         get_remote_heads(fd[0], &refs, 0, NULL, 0);
 616         packet_flush(fd[1]);
 617
 618         finish_connect(conn);
 619
 620         free(dest);
 621
 622         return refs;
 623 }
 624
 625 static int fetch_refs_via_pack(struct transport *transport,
 626                                int nr_heads, struct ref **to_fetch)
 627 {
 628         struct git_transport_data *data = transport->data;
 629         char **heads = xmalloc(nr_heads * sizeof(*heads));
 630         char **origh = xmalloc(nr_heads * sizeof(*origh));
 631         struct ref *refs;
 632         char *dest = xstrdup(transport->url);
 633         struct fetch_pack_args args;
 634         int i;
 635
 636         memset(&args, 0, sizeof(args));
 637         args.uploadpack = data->uploadpack;
 638         args.keep_pack = data->keep;
 639         args.lock_pack = 1;
 640         args.use_thin_pack = data->thin;
 641         args.verbose = transport->verbose > 0;
 642         args.depth = data->depth;
 643
 644         for (i = 0; i < nr_heads; i++)
 645                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 646         refs = fetch_pack(&args, dest, nr_heads, heads, &transport->pack_lockfile);
 647
 648         for (i = 0; i < nr_heads; i++)
 649                 free(origh[i]);
 650         free(origh);
 651         free(heads);
 652         free_refs(refs);
 653         free(dest);
 654         return 0;
 655 }
 656
 657 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 658 {
 659         struct git_transport_data *data = transport->data;
 660         struct send_pack_args args;
 661
 662         args.receivepack = data->receivepack;
 663         args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
 664         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 665         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 666         args.use_thin_pack = data->thin;
 667         args.verbose = transport->verbose;
 668         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 669
 670         return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
 671 }
 672
 673 static int disconnect_git(struct transport *transport)
 674 {
 675         free(transport->data);
 676         return 0;
 677 }
 678
 679 static int is_local(const char *url)
 680 {
 681         const char *colon = strchr(url, ':');
 682         const char *slash = strchr(url, '/');
 683         return !colon || (slash && slash < colon);
 684 }
 685
 686 static int is_file(const char *url)
 687 {
 688         struct stat buf;
 689         if (stat(url, &buf))
 690                 return 0;
 691         return S_ISREG(buf.st_mode);
 692 }
 693
 694 struct transport *transport_get(struct remote *remote, const char *url)
 695 {
 696         struct transport *ret = xcalloc(1, sizeof(*ret));
 697
 698         ret->remote = remote;
 699         ret->url = url;
 700
 701         if (!prefixcmp(url, "rsync://")) {
 702                 ret->get_refs_list = get_refs_via_rsync;
 703                 ret->fetch = fetch_objs_via_rsync;
 704                 ret->push = rsync_transport_push;
 705
 706         } else if (!prefixcmp(url, "http://")
 707                 || !prefixcmp(url, "https://")
 708                 || !prefixcmp(url, "ftp://")) {
 709 #ifdef NO_CURL
 710                 error("git was compiled without libcurl support.");
 711 #else
 712                 ret->get_refs_list = get_refs_via_curl;
 713                 ret->fetch = fetch_objs_via_curl;
 714                 ret->push = curl_transport_push;
 715 #endif
 716                 ret->disconnect = disconnect_walker;
 717
 718         } else if (is_local(url) && is_file(url)) {
 719                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 720                 ret->data = data;
 721                 ret->get_refs_list = get_refs_from_bundle;
 722                 ret->fetch = fetch_refs_from_bundle;
 723                 ret->disconnect = close_bundle;
 724
 725         } else {
 726                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 727                 ret->data = data;
 728                 ret->set_option = set_git_option;
 729                 ret->get_refs_list = get_refs_via_connect;
 730                 ret->fetch = fetch_refs_via_pack;
 731                 ret->push = git_transport_push;
 732                 ret->disconnect = disconnect_git;
 733
 734                 data->thin = 1;
 735                 data->uploadpack = "git-upload-pack";
 736                 if (remote && remote->uploadpack)
 737                         data->uploadpack = remote->uploadpack;
 738                 data->receivepack = "git-receive-pack";
 739                 if (remote && remote->receivepack)
 740                         data->receivepack = remote->receivepack;
 741         }
 742
 743         return ret;
 744 }
 745
 746 int transport_set_option(struct transport *transport,
 747                          const char *name, const char *value)
 748 {
 749         if (transport->set_option)
 750                 return transport->set_option(transport, name, value);
 751         return 1;
 752 }
 753
 754 int transport_push(struct transport *transport,
 755                    int refspec_nr, const char **refspec, int flags)
 756 {
 757         if (!transport->push)
 758                 return 1;
 759         return transport->push(transport, refspec_nr, refspec, flags);
 760 }
 761
 762 const struct ref *transport_get_remote_refs(struct transport *transport)
 763 {
 764         if (!transport->remote_refs)
 765                 transport->remote_refs = transport->get_refs_list(transport);
 766         return transport->remote_refs;
 767 }
 768
 769 int transport_fetch_refs(struct transport *transport, struct ref *refs)
 770 {
 771         int rc;
 772         int nr_heads = 0, nr_alloc = 0;
 773         struct ref **heads = NULL;
 774         struct ref *rm;
 775
 776         for (rm = refs; rm; rm = rm->next) {
 777                 if (rm->peer_ref &&
 778                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 779                         continue;
 780                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 781                 heads[nr_heads++] = rm;
 782         }
 783
 784         rc = transport->fetch(transport, nr_heads, heads);
 785         free(heads);
 786         return rc;
 787 }
 788
 789 void transport_unlock_pack(struct transport *transport)
 790 {
 791         if (transport->pack_lockfile) {
 792                 unlink(transport->pack_lockfile);
 793                 free(transport->pack_lockfile);
 794                 transport->pack_lockfile = NULL;
 795         }
 796 }
 797
 798 int transport_disconnect(struct transport *transport)
 799 {
 800         int ret = 0;
 801         if (transport->disconnect)
 802                 ret = transport->disconnect(transport);
 803         free(transport);
 804         return ret;
 805 }