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 #ifndef NO_CURL /* http fetch is the only user */
 352 static int fetch_objs_via_walker(struct transport *transport,
 353                                  int nr_objs, struct ref **to_fetch)
 354 {
 355         char *dest = xstrdup(transport->url);
 356         struct walker *walker = transport->data;
 357         char **objs = xmalloc(nr_objs * sizeof(*objs));
 358         int i;
 359
 360         walker->get_all = 1;
 361         walker->get_tree = 1;
 362         walker->get_history = 1;
 363         walker->get_verbosely = transport->verbose >= 0;
 364         walker->get_recover = 0;
 365
 366         for (i = 0; i < nr_objs; i++)
 367                 objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 368
 369         if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 370                 die("Fetch failed.");
 371
 372         for (i = 0; i < nr_objs; i++)
 373                 free(objs[i]);
 374         free(objs);
 375         free(dest);
 376         return 0;
 377 }
 378 #endif /* NO_CURL */
 379
 380 static int disconnect_walker(struct transport *transport)
 381 {
 382         struct walker *walker = transport->data;
 383         if (walker)
 384                 walker_free(walker);
 385         return 0;
 386 }
 387
 388 #ifndef NO_CURL
 389 static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 390 {
 391         const char **argv;
 392         int argc;
 393         int err;
 394
 395         if (flags & TRANSPORT_PUSH_MIRROR)
 396                 return error("http transport does not support mirror mode");
 397
 398         argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 399         argv[0] = "http-push";
 400         argc = 1;
 401         if (flags & TRANSPORT_PUSH_ALL)
 402                 argv[argc++] = "--all";
 403         if (flags & TRANSPORT_PUSH_FORCE)
 404                 argv[argc++] = "--force";
 405         if (flags & TRANSPORT_PUSH_DRY_RUN)
 406                 argv[argc++] = "--dry-run";
 407         if (flags & TRANSPORT_PUSH_VERBOSE)
 408                 argv[argc++] = "--verbose";
 409         argv[argc++] = transport->url;
 410         while (refspec_nr--)
 411                 argv[argc++] = *refspec++;
 412         argv[argc] = NULL;
 413         err = run_command_v_opt(argv, RUN_GIT_CMD);
 414         switch (err) {
 415         case -ERR_RUN_COMMAND_FORK:
 416                 error("unable to fork for %s", argv[0]);
 417         case -ERR_RUN_COMMAND_EXEC:
 418                 error("unable to exec %s", argv[0]);
 419                 break;
 420         case -ERR_RUN_COMMAND_WAITPID:
 421         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 422         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 423         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 424                 error("%s died with strange error", argv[0]);
 425         }
 426         return !!err;
 427 }
 428
 429 static int missing__target(int code, int result)
 430 {
 431         return  /* file:// URL -- do we ever use one??? */
 432                 (result == CURLE_FILE_COULDNT_READ_FILE) ||
 433                 /* http:// and https:// URL */
 434                 (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 435                 /* ftp:// URL */
 436                 (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 437                 ;
 438 }
 439
 440 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 441
 442 static struct ref *get_refs_via_curl(struct transport *transport)
 443 {
 444         struct buffer buffer;
 445         char *data, *start, *mid;
 446         char *ref_name;
 447         char *refs_url;
 448         int i = 0;
 449
 450         struct active_request_slot *slot;
 451         struct slot_results results;
 452
 453         struct ref *refs = NULL;
 454         struct ref *ref = NULL;
 455         struct ref *last_ref = NULL;
 456
 457         data = xmalloc(4096);
 458         buffer.size = 4096;
 459         buffer.posn = 0;
 460         buffer.buffer = data;
 461
 462         refs_url = xmalloc(strlen(transport->url) + 11);
 463         sprintf(refs_url, "%s/info/refs", transport->url);
 464
 465         http_init();
 466
 467         slot = get_active_slot();
 468         slot->results = &results;
 469         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 470         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 471         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 472         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 473         if (transport->remote->http_proxy)
 474                 curl_easy_setopt(slot->curl, CURLOPT_PROXY,
 475                                  transport->remote->http_proxy);
 476
 477         if (start_active_slot(slot)) {
 478                 run_active_slot(slot);
 479                 if (results.curl_result != CURLE_OK) {
 480                         if (missing_target(&results)) {
 481                                 free(buffer.buffer);
 482                                 return NULL;
 483                         } else {
 484                                 free(buffer.buffer);
 485                                 error("%s", curl_errorstr);
 486                                 return NULL;
 487                         }
 488                 }
 489         } else {
 490                 free(buffer.buffer);
 491                 error("Unable to start request");
 492                 return NULL;
 493         }
 494
 495         http_cleanup();
 496
 497         data = buffer.buffer;
 498         start = NULL;
 499         mid = data;
 500         while (i < buffer.posn) {
 501                 if (!start)
 502                         start = &data[i];
 503                 if (data[i] == '\t')
 504                         mid = &data[i];
 505                 if (data[i] == '\n') {
 506                         data[i] = 0;
 507                         ref_name = mid + 1;
 508                         ref = xmalloc(sizeof(struct ref) +
 509                                       strlen(ref_name) + 1);
 510                         memset(ref, 0, sizeof(struct ref));
 511                         strcpy(ref->name, ref_name);
 512                         get_sha1_hex(start, ref->old_sha1);
 513                         if (!refs)
 514                                 refs = ref;
 515                         if (last_ref)
 516                                 last_ref->next = ref;
 517                         last_ref = ref;
 518                         start = NULL;
 519                 }
 520                 i++;
 521         }
 522
 523         free(buffer.buffer);
 524
 525         return refs;
 526 }
 527
 528 static int fetch_objs_via_curl(struct transport *transport,
 529                                  int nr_objs, struct ref **to_fetch)
 530 {
 531         if (!transport->data)
 532                 transport->data = get_http_walker(transport->url);
 533         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 534 }
 535
 536 #endif
 537
 538 struct bundle_transport_data {
 539         int fd;
 540         struct bundle_header header;
 541 };
 542
 543 static struct ref *get_refs_from_bundle(struct transport *transport)
 544 {
 545         struct bundle_transport_data *data = transport->data;
 546         struct ref *result = NULL;
 547         int i;
 548
 549         if (data->fd > 0)
 550                 close(data->fd);
 551         data->fd = read_bundle_header(transport->url, &data->header);
 552         if (data->fd < 0)
 553                 die ("Could not read bundle '%s'.", transport->url);
 554         for (i = 0; i < data->header.references.nr; i++) {
 555                 struct ref_list_entry *e = data->header.references.list + i;
 556                 struct ref *ref = alloc_ref(strlen(e->name) + 1);
 557                 hashcpy(ref->old_sha1, e->sha1);
 558                 strcpy(ref->name, e->name);
 559                 ref->next = result;
 560                 result = ref;
 561         }
 562         return result;
 563 }
 564
 565 static int fetch_refs_from_bundle(struct transport *transport,
 566                                int nr_heads, struct ref **to_fetch)
 567 {
 568         struct bundle_transport_data *data = transport->data;
 569         return unbundle(&data->header, data->fd);
 570 }
 571
 572 static int close_bundle(struct transport *transport)
 573 {
 574         struct bundle_transport_data *data = transport->data;
 575         if (data->fd > 0)
 576                 close(data->fd);
 577         free(data);
 578         return 0;
 579 }
 580
 581 struct git_transport_data {
 582         unsigned thin : 1;
 583         unsigned keep : 1;
 584         int depth;
 585         const char *uploadpack;
 586         const char *receivepack;
 587 };
 588
 589 static int set_git_option(struct transport *connection,
 590                           const char *name, const char *value)
 591 {
 592         struct git_transport_data *data = connection->data;
 593         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 594                 data->uploadpack = value;
 595                 return 0;
 596         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 597                 data->receivepack = value;
 598                 return 0;
 599         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 600                 data->thin = !!value;
 601                 return 0;
 602         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 603                 data->keep = !!value;
 604                 return 0;
 605         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 606                 if (!value)
 607                         data->depth = 0;
 608                 else
 609                         data->depth = atoi(value);
 610                 return 0;
 611         }
 612         return 1;
 613 }
 614
 615 static struct ref *get_refs_via_connect(struct transport *transport)
 616 {
 617         struct git_transport_data *data = transport->data;
 618         struct ref *refs;
 619         int fd[2];
 620         char *dest = xstrdup(transport->url);
 621         struct child_process *conn = git_connect(fd, dest, data->uploadpack, 0);
 622
 623         get_remote_heads(fd[0], &refs, 0, NULL, 0);
 624         packet_flush(fd[1]);
 625
 626         finish_connect(conn);
 627
 628         free(dest);
 629
 630         return refs;
 631 }
 632
 633 static int fetch_refs_via_pack(struct transport *transport,
 634                                int nr_heads, struct ref **to_fetch)
 635 {
 636         struct git_transport_data *data = transport->data;
 637         char **heads = xmalloc(nr_heads * sizeof(*heads));
 638         char **origh = xmalloc(nr_heads * sizeof(*origh));
 639         struct ref *refs;
 640         char *dest = xstrdup(transport->url);
 641         struct fetch_pack_args args;
 642         int i;
 643
 644         memset(&args, 0, sizeof(args));
 645         args.uploadpack = data->uploadpack;
 646         args.keep_pack = data->keep;
 647         args.lock_pack = 1;
 648         args.use_thin_pack = data->thin;
 649         args.verbose = transport->verbose > 0;
 650         args.depth = data->depth;
 651
 652         for (i = 0; i < nr_heads; i++)
 653                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 654         refs = fetch_pack(&args, dest, nr_heads, heads, &transport->pack_lockfile);
 655
 656         for (i = 0; i < nr_heads; i++)
 657                 free(origh[i]);
 658         free(origh);
 659         free(heads);
 660         free_refs(refs);
 661         free(dest);
 662         return (refs ? 0 : -1);
 663 }
 664
 665 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 666 {
 667         struct git_transport_data *data = transport->data;
 668         struct send_pack_args args;
 669
 670         args.receivepack = data->receivepack;
 671         args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
 672         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 673         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 674         args.use_thin_pack = data->thin;
 675         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 676         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 677
 678         return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
 679 }
 680
 681 static int disconnect_git(struct transport *transport)
 682 {
 683         free(transport->data);
 684         return 0;
 685 }
 686
 687 static int is_local(const char *url)
 688 {
 689         const char *colon = strchr(url, ':');
 690         const char *slash = strchr(url, '/');
 691         return !colon || (slash && slash < colon);
 692 }
 693
 694 static int is_file(const char *url)
 695 {
 696         struct stat buf;
 697         if (stat(url, &buf))
 698                 return 0;
 699         return S_ISREG(buf.st_mode);
 700 }
 701
 702 struct transport *transport_get(struct remote *remote, const char *url)
 703 {
 704         struct transport *ret = xcalloc(1, sizeof(*ret));
 705
 706         ret->remote = remote;
 707         ret->url = url;
 708
 709         if (!prefixcmp(url, "rsync://")) {
 710                 ret->get_refs_list = get_refs_via_rsync;
 711                 ret->fetch = fetch_objs_via_rsync;
 712                 ret->push = rsync_transport_push;
 713
 714         } else if (!prefixcmp(url, "http://")
 715                 || !prefixcmp(url, "https://")
 716                 || !prefixcmp(url, "ftp://")) {
 717 #ifdef NO_CURL
 718                 error("git was compiled without libcurl support.");
 719 #else
 720                 ret->get_refs_list = get_refs_via_curl;
 721                 ret->fetch = fetch_objs_via_curl;
 722                 ret->push = curl_transport_push;
 723 #endif
 724                 ret->disconnect = disconnect_walker;
 725
 726         } else if (is_local(url) && is_file(url)) {
 727                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 728                 ret->data = data;
 729                 ret->get_refs_list = get_refs_from_bundle;
 730                 ret->fetch = fetch_refs_from_bundle;
 731                 ret->disconnect = close_bundle;
 732
 733         } else {
 734                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 735                 ret->data = data;
 736                 ret->set_option = set_git_option;
 737                 ret->get_refs_list = get_refs_via_connect;
 738                 ret->fetch = fetch_refs_via_pack;
 739                 ret->push = git_transport_push;
 740                 ret->disconnect = disconnect_git;
 741
 742                 data->thin = 1;
 743                 data->uploadpack = "git-upload-pack";
 744                 if (remote && remote->uploadpack)
 745                         data->uploadpack = remote->uploadpack;
 746                 data->receivepack = "git-receive-pack";
 747                 if (remote && remote->receivepack)
 748                         data->receivepack = remote->receivepack;
 749         }
 750
 751         return ret;
 752 }
 753
 754 int transport_set_option(struct transport *transport,
 755                          const char *name, const char *value)
 756 {
 757         if (transport->set_option)
 758                 return transport->set_option(transport, name, value);
 759         return 1;
 760 }
 761
 762 int transport_push(struct transport *transport,
 763                    int refspec_nr, const char **refspec, int flags)
 764 {
 765         if (!transport->push)
 766                 return 1;
 767         return transport->push(transport, refspec_nr, refspec, flags);
 768 }
 769
 770 const struct ref *transport_get_remote_refs(struct transport *transport)
 771 {
 772         if (!transport->remote_refs)
 773                 transport->remote_refs = transport->get_refs_list(transport);
 774         return transport->remote_refs;
 775 }
 776
 777 int transport_fetch_refs(struct transport *transport, struct ref *refs)
 778 {
 779         int rc;
 780         int nr_heads = 0, nr_alloc = 0;
 781         struct ref **heads = NULL;
 782         struct ref *rm;
 783
 784         for (rm = refs; rm; rm = rm->next) {
 785                 if (rm->peer_ref &&
 786                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 787                         continue;
 788                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 789                 heads[nr_heads++] = rm;
 790         }
 791
 792         rc = transport->fetch(transport, nr_heads, heads);
 793         free(heads);
 794         return rc;
 795 }
 796
 797 void transport_unlock_pack(struct transport *transport)
 798 {
 799         if (transport->pack_lockfile) {
 800                 unlink(transport->pack_lockfile);
 801                 free(transport->pack_lockfile);
 802                 transport->pack_lockfile = NULL;
 803         }
 804 }
 805
 806 int transport_disconnect(struct transport *transport)
 807 {
 808         int ret = 0;
 809         if (transport->disconnect)
 810                 ret = transport->disconnect(transport);
 811         free(transport);
 812         return ret;
 813 }