git.oblomov.eu Git - git/blob - 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 (len && 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 struct ref *get_refs_via_curl(struct transport *transport)
 430 {
 431         struct strbuf buffer = STRBUF_INIT;
 432         char *data, *start, *mid;
 433         char *ref_name;
 434         char *refs_url;
 435         int i = 0;
 436
 437         struct active_request_slot *slot;
 438         struct slot_results results;
 439
 440         struct ref *refs = NULL;
 441         struct ref *ref = NULL;
 442         struct ref *last_ref = NULL;
 443
 444         if (!transport->data)
 445                 transport->data = get_http_walker(transport->url);
 446
 447         refs_url = xmalloc(strlen(transport->url) + 11);
 448         sprintf(refs_url, "%s/info/refs", transport->url);
 449
 450         slot = get_active_slot();
 451         slot->results = &results;
 452         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 453         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 454         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 455         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 456         if (transport->remote->http_proxy)
 457                 curl_easy_setopt(slot->curl, CURLOPT_PROXY,
 458                                  transport->remote->http_proxy);
 459
 460         if (start_active_slot(slot)) {
 461                 run_active_slot(slot);
 462                 if (results.curl_result != CURLE_OK) {
 463                         strbuf_release(&buffer);
 464                         if (missing_target(&results)) {
 465                                 return NULL;
 466                         } else {
 467                                 error("%s", curl_errorstr);
 468                                 return NULL;
 469                         }
 470                 }
 471         } else {
 472                 strbuf_release(&buffer);
 473                 error("Unable to start request");
 474                 return NULL;
 475         }
 476
 477         data = buffer.buf;
 478         start = NULL;
 479         mid = data;
 480         while (i < buffer.len) {
 481                 if (!start)
 482                         start = &data[i];
 483                 if (data[i] == '\t')
 484                         mid = &data[i];
 485                 if (data[i] == '\n') {
 486                         data[i] = 0;
 487                         ref_name = mid + 1;
 488                         ref = xmalloc(sizeof(struct ref) +
 489                                       strlen(ref_name) + 1);
 490                         memset(ref, 0, sizeof(struct ref));
 491                         strcpy(ref->name, ref_name);
 492                         get_sha1_hex(start, ref->old_sha1);
 493                         if (!refs)
 494                                 refs = ref;
 495                         if (last_ref)
 496                                 last_ref->next = ref;
 497                         last_ref = ref;
 498                         start = NULL;
 499                 }
 500                 i++;
 501         }
 502
 503         strbuf_release(&buffer);
 504
 505         return refs;
 506 }
 507
 508 static int fetch_objs_via_curl(struct transport *transport,
 509                                  int nr_objs, struct ref **to_fetch)
 510 {
 511         if (!transport->data)
 512                 transport->data = get_http_walker(transport->url);
 513         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 514 }
 515
 516 #endif
 517
 518 struct bundle_transport_data {
 519         int fd;
 520         struct bundle_header header;
 521 };
 522
 523 static struct ref *get_refs_from_bundle(struct transport *transport)
 524 {
 525         struct bundle_transport_data *data = transport->data;
 526         struct ref *result = NULL;
 527         int i;
 528
 529         if (data->fd > 0)
 530                 close(data->fd);
 531         data->fd = read_bundle_header(transport->url, &data->header);
 532         if (data->fd < 0)
 533                 die ("Could not read bundle '%s'.", transport->url);
 534         for (i = 0; i < data->header.references.nr; i++) {
 535                 struct ref_list_entry *e = data->header.references.list + i;
 536                 struct ref *ref = alloc_ref(strlen(e->name) + 1);
 537                 hashcpy(ref->old_sha1, e->sha1);
 538                 strcpy(ref->name, e->name);
 539                 ref->next = result;
 540                 result = ref;
 541         }
 542         return result;
 543 }
 544
 545 static int fetch_refs_from_bundle(struct transport *transport,
 546                                int nr_heads, struct ref **to_fetch)
 547 {
 548         struct bundle_transport_data *data = transport->data;
 549         return unbundle(&data->header, data->fd);
 550 }
 551
 552 static int close_bundle(struct transport *transport)
 553 {
 554         struct bundle_transport_data *data = transport->data;
 555         if (data->fd > 0)
 556                 close(data->fd);
 557         free(data);
 558         return 0;
 559 }
 560
 561 struct git_transport_data {
 562         unsigned thin : 1;
 563         unsigned keep : 1;
 564         int depth;
 565         struct child_process *conn;
 566         int fd[2];
 567         const char *uploadpack;
 568         const char *receivepack;
 569 };
 570
 571 static int set_git_option(struct transport *connection,
 572                           const char *name, const char *value)
 573 {
 574         struct git_transport_data *data = connection->data;
 575         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 576                 data->uploadpack = value;
 577                 return 0;
 578         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 579                 data->receivepack = value;
 580                 return 0;
 581         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 582                 data->thin = !!value;
 583                 return 0;
 584         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 585                 data->keep = !!value;
 586                 return 0;
 587         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 588                 if (!value)
 589                         data->depth = 0;
 590                 else
 591                         data->depth = atoi(value);
 592                 return 0;
 593         }
 594         return 1;
 595 }
 596
 597 static int connect_setup(struct transport *transport)
 598 {
 599         struct git_transport_data *data = transport->data;
 600         data->conn = git_connect(data->fd, transport->url, data->uploadpack, 0);
 601         return 0;
 602 }
 603
 604 static struct ref *get_refs_via_connect(struct transport *transport)
 605 {
 606         struct git_transport_data *data = transport->data;
 607         struct ref *refs;
 608
 609         connect_setup(transport);
 610         get_remote_heads(data->fd[0], &refs, 0, NULL, 0);
 611
 612         return refs;
 613 }
 614
 615 static int fetch_refs_via_pack(struct transport *transport,
 616                                int nr_heads, struct ref **to_fetch)
 617 {
 618         struct git_transport_data *data = transport->data;
 619         char **heads = xmalloc(nr_heads * sizeof(*heads));
 620         char **origh = xmalloc(nr_heads * sizeof(*origh));
 621         const struct ref *refs;
 622         char *dest = xstrdup(transport->url);
 623         struct fetch_pack_args args;
 624         int i;
 625
 626         memset(&args, 0, sizeof(args));
 627         args.uploadpack = data->uploadpack;
 628         args.keep_pack = data->keep;
 629         args.lock_pack = 1;
 630         args.use_thin_pack = data->thin;
 631         args.verbose = transport->verbose > 0;
 632         args.depth = data->depth;
 633
 634         for (i = 0; i < nr_heads; i++)
 635                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 636
 637         refs = transport_get_remote_refs(transport);
 638         if (!data->conn) {
 639                 struct ref *refs_tmp;
 640                 connect_setup(transport);
 641                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0);
 642                 free_refs(refs_tmp);
 643         }
 644
 645         refs = fetch_pack(&args, data->fd, data->conn, transport->remote_refs,
 646                           dest, nr_heads, heads, &transport->pack_lockfile);
 647         close(data->fd[0]);
 648         close(data->fd[1]);
 649         if (finish_connect(data->conn))
 650                 refs = NULL;
 651         data->conn = NULL;
 652
 653         for (i = 0; i < nr_heads; i++)
 654                 free(origh[i]);
 655         free(origh);
 656         free(heads);
 657         free(dest);
 658         return (refs ? 0 : -1);
 659 }
 660
 661 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 662 {
 663         struct git_transport_data *data = transport->data;
 664         struct send_pack_args args;
 665
 666         args.receivepack = data->receivepack;
 667         args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
 668         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 669         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 670         args.use_thin_pack = data->thin;
 671         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 672         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 673
 674         return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
 675 }
 676
 677 static int disconnect_git(struct transport *transport)
 678 {
 679         struct git_transport_data *data = transport->data;
 680         if (data->conn) {
 681                 packet_flush(data->fd[1]);
 682                 close(data->fd[0]);
 683                 close(data->fd[1]);
 684                 finish_connect(data->conn);
 685         }
 686
 687         free(data);
 688         return 0;
 689 }
 690
 691 static int is_local(const char *url)
 692 {
 693         const char *colon = strchr(url, ':');
 694         const char *slash = strchr(url, '/');
 695         return !colon || (slash && slash < colon);
 696 }
 697
 698 static int is_file(const char *url)
 699 {
 700         struct stat buf;
 701         if (stat(url, &buf))
 702                 return 0;
 703         return S_ISREG(buf.st_mode);
 704 }
 705
 706 struct transport *transport_get(struct remote *remote, const char *url)
 707 {
 708         struct transport *ret = xcalloc(1, sizeof(*ret));
 709
 710         ret->remote = remote;
 711         ret->url = url;
 712
 713         if (!prefixcmp(url, "rsync://")) {
 714                 ret->get_refs_list = get_refs_via_rsync;
 715                 ret->fetch = fetch_objs_via_rsync;
 716                 ret->push = rsync_transport_push;
 717
 718         } else if (!prefixcmp(url, "http://")
 719                 || !prefixcmp(url, "https://")
 720                 || !prefixcmp(url, "ftp://")) {
 721 #ifdef NO_CURL
 722                 error("git was compiled without libcurl support.");
 723 #else
 724                 ret->get_refs_list = get_refs_via_curl;
 725                 ret->fetch = fetch_objs_via_curl;
 726                 ret->push = curl_transport_push;
 727 #endif
 728                 ret->disconnect = disconnect_walker;
 729
 730         } else if (is_local(url) && is_file(url)) {
 731                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 732                 ret->data = data;
 733                 ret->get_refs_list = get_refs_from_bundle;
 734                 ret->fetch = fetch_refs_from_bundle;
 735                 ret->disconnect = close_bundle;
 736
 737         } else {
 738                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 739                 ret->data = data;
 740                 ret->set_option = set_git_option;
 741                 ret->get_refs_list = get_refs_via_connect;
 742                 ret->fetch = fetch_refs_via_pack;
 743                 ret->push = git_transport_push;
 744                 ret->disconnect = disconnect_git;
 745
 746                 data->thin = 1;
 747                 data->conn = NULL;
 748                 data->uploadpack = "git-upload-pack";
 749                 if (remote && remote->uploadpack)
 750                         data->uploadpack = remote->uploadpack;
 751                 data->receivepack = "git-receive-pack";
 752                 if (remote && remote->receivepack)
 753                         data->receivepack = remote->receivepack;
 754         }
 755
 756         return ret;
 757 }
 758
 759 int transport_set_option(struct transport *transport,
 760                          const char *name, const char *value)
 761 {
 762         if (transport->set_option)
 763                 return transport->set_option(transport, name, value);
 764         return 1;
 765 }
 766
 767 int transport_push(struct transport *transport,
 768                    int refspec_nr, const char **refspec, int flags)
 769 {
 770         if (!transport->push)
 771                 return 1;
 772         return transport->push(transport, refspec_nr, refspec, flags);
 773 }
 774
 775 const struct ref *transport_get_remote_refs(struct transport *transport)
 776 {
 777         if (!transport->remote_refs)
 778                 transport->remote_refs = transport->get_refs_list(transport);
 779         return transport->remote_refs;
 780 }
 781
 782 int transport_fetch_refs(struct transport *transport, struct ref *refs)
 783 {
 784         int rc;
 785         int nr_heads = 0, nr_alloc = 0;
 786         struct ref **heads = NULL;
 787         struct ref *rm;
 788
 789         for (rm = refs; rm; rm = rm->next) {
 790                 if (rm->peer_ref &&
 791                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 792                         continue;
 793                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 794                 heads[nr_heads++] = rm;
 795         }
 796
 797         rc = transport->fetch(transport, nr_heads, heads);
 798         free(heads);
 799         return rc;
 800 }
 801
 802 void transport_unlock_pack(struct transport *transport)
 803 {
 804         if (transport->pack_lockfile) {
 805                 unlink(transport->pack_lockfile);
 806                 free(transport->pack_lockfile);
 807                 transport->pack_lockfile = NULL;
 808         }
 809 }
 810
 811 int transport_disconnect(struct transport *transport)
 812 {
 813         int ret = 0;
 814         if (transport->disconnect)
 815                 ret = transport->disconnect(transport);
 816         free(transport);
 817         return ret;
 818 }