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 (is_dot_or_dotdot(de->d_name))
  54                         continue;
  55                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  56                 list.entries[list.nr++] = xstrdup(de->d_name);
  57         }
  58         closedir(dir);
  59
  60         /* sort the list */
  61
  62         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  63
  64         pathlen = path->len;
  65         strbuf_addch(path, '/');
  66
  67         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  68                 strbuf_addstr(path, list.entries[i]);
  69                 if (read_loose_refs(path, name_offset, tail)) {
  70                         int fd = open(path->buf, O_RDONLY);
  71                         char buffer[40];
  72                         struct ref *next;
  73
  74                         if (fd < 0)
  75                                 continue;
  76                         next = alloc_ref(path->buf + name_offset);
  77                         if (read_in_full(fd, buffer, 40) != 40 ||
  78                                         get_sha1_hex(buffer, next->old_sha1)) {
  79                                 close(fd);
  80                                 free(next);
  81                                 continue;
  82                         }
  83                         close(fd);
  84                         (*tail)->next = next;
  85                         *tail = next;
  86                 }
  87         }
  88         strbuf_setlen(path, pathlen);
  89
  90         for (i = 0; i < list.nr; i++)
  91                 free(list.entries[i]);
  92         free(list.entries);
  93
  94         return 0;
  95 }
  96
  97 /* insert the packed refs for which no loose refs were found */
  98
  99 static void insert_packed_refs(const char *packed_refs, struct ref **list)
 100 {
 101         FILE *f = fopen(packed_refs, "r");
 102         static char buffer[PATH_MAX];
 103
 104         if (!f)
 105                 return;
 106
 107         for (;;) {
 108                 int cmp = cmp, len;
 109
 110                 if (!fgets(buffer, sizeof(buffer), f)) {
 111                         fclose(f);
 112                         return;
 113                 }
 114
 115                 if (hexval(buffer[0]) > 0xf)
 116                         continue;
 117                 len = strlen(buffer);
 118                 if (len && buffer[len - 1] == '\n')
 119                         buffer[--len] = '\0';
 120                 if (len < 41)
 121                         continue;
 122                 while ((*list)->next &&
 123                                 (cmp = strcmp(buffer + 41,
 124                                       (*list)->next->name)) > 0)
 125                         list = &(*list)->next;
 126                 if (!(*list)->next || cmp < 0) {
 127                         struct ref *next = alloc_ref(buffer + 41);
 128                         buffer[40] = '\0';
 129                         if (get_sha1_hex(buffer, next->old_sha1)) {
 130                                 warning ("invalid SHA-1: %s", buffer);
 131                                 free(next);
 132                                 continue;
 133                         }
 134                         next->next = (*list)->next;
 135                         (*list)->next = next;
 136                         list = &(*list)->next;
 137                 }
 138         }
 139 }
 140
 141 static struct ref *get_refs_via_rsync(struct transport *transport)
 142 {
 143         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 144         struct ref dummy, *tail = &dummy;
 145         struct child_process rsync;
 146         const char *args[5];
 147         int temp_dir_len;
 148
 149         /* copy the refs to the temporary directory */
 150
 151         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 152         if (!mkdtemp(temp_dir.buf))
 153                 die ("Could not make temporary directory");
 154         temp_dir_len = temp_dir.len;
 155
 156         strbuf_addstr(&buf, transport->url);
 157         strbuf_addstr(&buf, "/refs");
 158
 159         memset(&rsync, 0, sizeof(rsync));
 160         rsync.argv = args;
 161         rsync.stdout_to_stderr = 1;
 162         args[0] = "rsync";
 163         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 164         args[2] = buf.buf;
 165         args[3] = temp_dir.buf;
 166         args[4] = NULL;
 167
 168         if (run_command(&rsync))
 169                 die ("Could not run rsync to get refs");
 170
 171         strbuf_reset(&buf);
 172         strbuf_addstr(&buf, transport->url);
 173         strbuf_addstr(&buf, "/packed-refs");
 174
 175         args[2] = buf.buf;
 176
 177         if (run_command(&rsync))
 178                 die ("Could not run rsync to get refs");
 179
 180         /* read the copied refs */
 181
 182         strbuf_addstr(&temp_dir, "/refs");
 183         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 184         strbuf_setlen(&temp_dir, temp_dir_len);
 185
 186         tail = &dummy;
 187         strbuf_addstr(&temp_dir, "/packed-refs");
 188         insert_packed_refs(temp_dir.buf, &tail);
 189         strbuf_setlen(&temp_dir, temp_dir_len);
 190
 191         if (remove_dir_recursively(&temp_dir, 0))
 192                 warning ("Error removing temporary directory %s.",
 193                                 temp_dir.buf);
 194
 195         strbuf_release(&buf);
 196         strbuf_release(&temp_dir);
 197
 198         return dummy.next;
 199 }
 200
 201 static int fetch_objs_via_rsync(struct transport *transport,
 202                                 int nr_objs, const struct ref **to_fetch)
 203 {
 204         struct strbuf buf = STRBUF_INIT;
 205         struct child_process rsync;
 206         const char *args[8];
 207         int result;
 208
 209         strbuf_addstr(&buf, transport->url);
 210         strbuf_addstr(&buf, "/objects/");
 211
 212         memset(&rsync, 0, sizeof(rsync));
 213         rsync.argv = args;
 214         rsync.stdout_to_stderr = 1;
 215         args[0] = "rsync";
 216         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 217         args[2] = "--ignore-existing";
 218         args[3] = "--exclude";
 219         args[4] = "info";
 220         args[5] = buf.buf;
 221         args[6] = get_object_directory();
 222         args[7] = NULL;
 223
 224         /* NEEDSWORK: handle one level of alternates */
 225         result = run_command(&rsync);
 226
 227         strbuf_release(&buf);
 228
 229         return result;
 230 }
 231
 232 static int write_one_ref(const char *name, const unsigned char *sha1,
 233                 int flags, void *data)
 234 {
 235         struct strbuf *buf = data;
 236         int len = buf->len;
 237         FILE *f;
 238
 239         /* when called via for_each_ref(), flags is non-zero */
 240         if (flags && prefixcmp(name, "refs/heads/") &&
 241                         prefixcmp(name, "refs/tags/"))
 242                 return 0;
 243
 244         strbuf_addstr(buf, name);
 245         if (safe_create_leading_directories(buf->buf) ||
 246                         !(f = fopen(buf->buf, "w")) ||
 247                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 248                         fclose(f))
 249                 return error("problems writing temporary file %s", buf->buf);
 250         strbuf_setlen(buf, len);
 251         return 0;
 252 }
 253
 254 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 255                 int refspec_nr, const char **refspec)
 256 {
 257         int i;
 258
 259         for (i = 0; i < refspec_nr; i++) {
 260                 unsigned char sha1[20];
 261                 char *ref;
 262
 263                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 264                         return error("Could not get ref %s", refspec[i]);
 265
 266                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 267                         free(ref);
 268                         return -1;
 269                 }
 270                 free(ref);
 271         }
 272         return 0;
 273 }
 274
 275 static int rsync_transport_push(struct transport *transport,
 276                 int refspec_nr, const char **refspec, int flags)
 277 {
 278         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 279         int result = 0, i;
 280         struct child_process rsync;
 281         const char *args[10];
 282
 283         if (flags & TRANSPORT_PUSH_MIRROR)
 284                 return error("rsync transport does not support mirror mode");
 285
 286         /* first push the objects */
 287
 288         strbuf_addstr(&buf, transport->url);
 289         strbuf_addch(&buf, '/');
 290
 291         memset(&rsync, 0, sizeof(rsync));
 292         rsync.argv = args;
 293         rsync.stdout_to_stderr = 1;
 294         i = 0;
 295         args[i++] = "rsync";
 296         args[i++] = "-a";
 297         if (flags & TRANSPORT_PUSH_DRY_RUN)
 298                 args[i++] = "--dry-run";
 299         if (transport->verbose > 0)
 300                 args[i++] = "-v";
 301         args[i++] = "--ignore-existing";
 302         args[i++] = "--exclude";
 303         args[i++] = "info";
 304         args[i++] = get_object_directory();
 305         args[i++] = buf.buf;
 306         args[i++] = NULL;
 307
 308         if (run_command(&rsync))
 309                 return error("Could not push objects to %s", transport->url);
 310
 311         /* copy the refs to the temporary directory; they could be packed. */
 312
 313         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 314         if (!mkdtemp(temp_dir.buf))
 315                 die ("Could not make temporary directory");
 316         strbuf_addch(&temp_dir, '/');
 317
 318         if (flags & TRANSPORT_PUSH_ALL) {
 319                 if (for_each_ref(write_one_ref, &temp_dir))
 320                         return -1;
 321         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 322                 return -1;
 323
 324         i = 2;
 325         if (flags & TRANSPORT_PUSH_DRY_RUN)
 326                 args[i++] = "--dry-run";
 327         if (!(flags & TRANSPORT_PUSH_FORCE))
 328                 args[i++] = "--ignore-existing";
 329         args[i++] = temp_dir.buf;
 330         args[i++] = transport->url;
 331         args[i++] = NULL;
 332         if (run_command(&rsync))
 333                 result = error("Could not push to %s", transport->url);
 334
 335         if (remove_dir_recursively(&temp_dir, 0))
 336                 warning ("Could not remove temporary directory %s.",
 337                                 temp_dir.buf);
 338
 339         strbuf_release(&buf);
 340         strbuf_release(&temp_dir);
 341
 342         return result;
 343 }
 344
 345 /* Generic functions for using commit walkers */
 346
 347 #ifndef NO_CURL /* http fetch is the only user */
 348 static int fetch_objs_via_walker(struct transport *transport,
 349                                  int nr_objs, const struct ref **to_fetch)
 350 {
 351         char *dest = xstrdup(transport->url);
 352         struct walker *walker = transport->data;
 353         char **objs = xmalloc(nr_objs * sizeof(*objs));
 354         int i;
 355
 356         walker->get_all = 1;
 357         walker->get_tree = 1;
 358         walker->get_history = 1;
 359         walker->get_verbosely = transport->verbose >= 0;
 360         walker->get_recover = 0;
 361
 362         for (i = 0; i < nr_objs; i++)
 363                 objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 364
 365         if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 366                 die("Fetch failed.");
 367
 368         for (i = 0; i < nr_objs; i++)
 369                 free(objs[i]);
 370         free(objs);
 371         free(dest);
 372         return 0;
 373 }
 374 #endif /* NO_CURL */
 375
 376 static int disconnect_walker(struct transport *transport)
 377 {
 378         struct walker *walker = transport->data;
 379         if (walker)
 380                 walker_free(walker);
 381         return 0;
 382 }
 383
 384 #ifndef NO_CURL
 385 static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 386 {
 387         const char **argv;
 388         int argc;
 389         int err;
 390
 391         if (flags & TRANSPORT_PUSH_MIRROR)
 392                 return error("http transport does not support mirror mode");
 393
 394         argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 395         argv[0] = "http-push";
 396         argc = 1;
 397         if (flags & TRANSPORT_PUSH_ALL)
 398                 argv[argc++] = "--all";
 399         if (flags & TRANSPORT_PUSH_FORCE)
 400                 argv[argc++] = "--force";
 401         if (flags & TRANSPORT_PUSH_DRY_RUN)
 402                 argv[argc++] = "--dry-run";
 403         if (flags & TRANSPORT_PUSH_VERBOSE)
 404                 argv[argc++] = "--verbose";
 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 struct ref *get_refs_via_curl(struct transport *transport)
 426 {
 427         struct strbuf buffer = STRBUF_INIT;
 428         char *data, *start, *mid;
 429         char *ref_name;
 430         char *refs_url;
 431         int i = 0;
 432
 433         struct active_request_slot *slot;
 434         struct slot_results results;
 435
 436         struct ref *refs = NULL;
 437         struct ref *ref = NULL;
 438         struct ref *last_ref = NULL;
 439
 440         struct walker *walker;
 441
 442         if (!transport->data)
 443                 transport->data = get_http_walker(transport->url,
 444                                                 transport->remote);
 445
 446         walker = transport->data;
 447
 448         refs_url = xmalloc(strlen(transport->url) + 11);
 449         sprintf(refs_url, "%s/info/refs", transport->url);
 450
 451         slot = get_active_slot();
 452         slot->results = &results;
 453         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 454         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 455         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 456         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 457
 458         if (start_active_slot(slot)) {
 459                 run_active_slot(slot);
 460                 if (results.curl_result != CURLE_OK) {
 461                         strbuf_release(&buffer);
 462                         if (missing_target(&results))
 463                                 die("%s not found: did you run git update-server-info on the server?", refs_url);
 464                         else
 465                                 die("%s download error - %s", refs_url, curl_errorstr);
 466                 }
 467         } else {
 468                 strbuf_release(&buffer);
 469                 die("Unable to start HTTP request");
 470         }
 471
 472         data = buffer.buf;
 473         start = NULL;
 474         mid = data;
 475         while (i < buffer.len) {
 476                 if (!start)
 477                         start = &data[i];
 478                 if (data[i] == '\t')
 479                         mid = &data[i];
 480                 if (data[i] == '\n') {
 481                         data[i] = 0;
 482                         ref_name = mid + 1;
 483                         ref = xmalloc(sizeof(struct ref) +
 484                                       strlen(ref_name) + 1);
 485                         memset(ref, 0, sizeof(struct ref));
 486                         strcpy(ref->name, ref_name);
 487                         get_sha1_hex(start, ref->old_sha1);
 488                         if (!refs)
 489                                 refs = ref;
 490                         if (last_ref)
 491                                 last_ref->next = ref;
 492                         last_ref = ref;
 493                         start = NULL;
 494                 }
 495                 i++;
 496         }
 497
 498         strbuf_release(&buffer);
 499
 500         ref = alloc_ref("HEAD");
 501         if (!walker->fetch_ref(walker, ref) &&
 502             !resolve_remote_symref(ref, refs)) {
 503                 ref->next = refs;
 504                 refs = ref;
 505         } else {
 506                 free(ref);
 507         }
 508
 509         return refs;
 510 }
 511
 512 static int fetch_objs_via_curl(struct transport *transport,
 513                                  int nr_objs, const struct ref **to_fetch)
 514 {
 515         if (!transport->data)
 516                 transport->data = get_http_walker(transport->url,
 517                                                 transport->remote);
 518         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 519 }
 520
 521 #endif
 522
 523 struct bundle_transport_data {
 524         int fd;
 525         struct bundle_header header;
 526 };
 527
 528 static struct ref *get_refs_from_bundle(struct transport *transport)
 529 {
 530         struct bundle_transport_data *data = transport->data;
 531         struct ref *result = NULL;
 532         int i;
 533
 534         if (data->fd > 0)
 535                 close(data->fd);
 536         data->fd = read_bundle_header(transport->url, &data->header);
 537         if (data->fd < 0)
 538                 die ("Could not read bundle '%s'.", transport->url);
 539         for (i = 0; i < data->header.references.nr; i++) {
 540                 struct ref_list_entry *e = data->header.references.list + i;
 541                 struct ref *ref = alloc_ref(e->name);
 542                 hashcpy(ref->old_sha1, e->sha1);
 543                 ref->next = result;
 544                 result = ref;
 545         }
 546         return result;
 547 }
 548
 549 static int fetch_refs_from_bundle(struct transport *transport,
 550                                int nr_heads, const struct ref **to_fetch)
 551 {
 552         struct bundle_transport_data *data = transport->data;
 553         return unbundle(&data->header, data->fd);
 554 }
 555
 556 static int close_bundle(struct transport *transport)
 557 {
 558         struct bundle_transport_data *data = transport->data;
 559         if (data->fd > 0)
 560                 close(data->fd);
 561         free(data);
 562         return 0;
 563 }
 564
 565 struct git_transport_data {
 566         unsigned thin : 1;
 567         unsigned keep : 1;
 568         unsigned followtags : 1;
 569         int depth;
 570         struct child_process *conn;
 571         int fd[2];
 572         const char *uploadpack;
 573         const char *receivepack;
 574 };
 575
 576 static int set_git_option(struct transport *connection,
 577                           const char *name, const char *value)
 578 {
 579         struct git_transport_data *data = connection->data;
 580         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 581                 data->uploadpack = value;
 582                 return 0;
 583         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 584                 data->receivepack = value;
 585                 return 0;
 586         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 587                 data->thin = !!value;
 588                 return 0;
 589         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 590                 data->followtags = !!value;
 591                 return 0;
 592         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 593                 data->keep = !!value;
 594                 return 0;
 595         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 596                 if (!value)
 597                         data->depth = 0;
 598                 else
 599                         data->depth = atoi(value);
 600                 return 0;
 601         }
 602         return 1;
 603 }
 604
 605 static int connect_setup(struct transport *transport)
 606 {
 607         struct git_transport_data *data = transport->data;
 608         data->conn = git_connect(data->fd, transport->url, data->uploadpack, 0);
 609         return 0;
 610 }
 611
 612 static struct ref *get_refs_via_connect(struct transport *transport)
 613 {
 614         struct git_transport_data *data = transport->data;
 615         struct ref *refs;
 616
 617         connect_setup(transport);
 618         get_remote_heads(data->fd[0], &refs, 0, NULL, 0, NULL);
 619
 620         return refs;
 621 }
 622
 623 static int fetch_refs_via_pack(struct transport *transport,
 624                                int nr_heads, const struct ref **to_fetch)
 625 {
 626         struct git_transport_data *data = transport->data;
 627         char **heads = xmalloc(nr_heads * sizeof(*heads));
 628         char **origh = xmalloc(nr_heads * sizeof(*origh));
 629         const struct ref *refs;
 630         char *dest = xstrdup(transport->url);
 631         struct fetch_pack_args args;
 632         int i;
 633         struct ref *refs_tmp = NULL;
 634
 635         memset(&args, 0, sizeof(args));
 636         args.uploadpack = data->uploadpack;
 637         args.keep_pack = data->keep;
 638         args.lock_pack = 1;
 639         args.use_thin_pack = data->thin;
 640         args.include_tag = data->followtags;
 641         args.verbose = (transport->verbose > 0);
 642         args.quiet = (transport->verbose < 0);
 643         args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 644         args.depth = data->depth;
 645
 646         for (i = 0; i < nr_heads; i++)
 647                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 648
 649         if (!data->conn) {
 650                 connect_setup(transport);
 651                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 652         }
 653
 654         refs = fetch_pack(&args, data->fd, data->conn,
 655                           refs_tmp ? refs_tmp : transport->remote_refs,
 656                           dest, nr_heads, heads, &transport->pack_lockfile);
 657         close(data->fd[0]);
 658         close(data->fd[1]);
 659         if (finish_connect(data->conn))
 660                 refs = NULL;
 661         data->conn = NULL;
 662
 663         free_refs(refs_tmp);
 664
 665         for (i = 0; i < nr_heads; i++)
 666                 free(origh[i]);
 667         free(origh);
 668         free(heads);
 669         free(dest);
 670         return (refs ? 0 : -1);
 671 }
 672
 673 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 674 {
 675         struct git_transport_data *data = transport->data;
 676         struct send_pack_args args;
 677
 678         args.receivepack = data->receivepack;
 679         args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
 680         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 681         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 682         args.use_thin_pack = data->thin;
 683         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 684         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 685
 686         return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
 687 }
 688
 689 static int disconnect_git(struct transport *transport)
 690 {
 691         struct git_transport_data *data = transport->data;
 692         if (data->conn) {
 693                 packet_flush(data->fd[1]);
 694                 close(data->fd[0]);
 695                 close(data->fd[1]);
 696                 finish_connect(data->conn);
 697         }
 698
 699         free(data);
 700         return 0;
 701 }
 702
 703 static int is_local(const char *url)
 704 {
 705         const char *colon = strchr(url, ':');
 706         const char *slash = strchr(url, '/');
 707         return !colon || (slash && slash < colon) ||
 708                 has_dos_drive_prefix(url);
 709 }
 710
 711 static int is_file(const char *url)
 712 {
 713         struct stat buf;
 714         if (stat(url, &buf))
 715                 return 0;
 716         return S_ISREG(buf.st_mode);
 717 }
 718
 719 struct transport *transport_get(struct remote *remote, const char *url)
 720 {
 721         struct transport *ret = xcalloc(1, sizeof(*ret));
 722
 723         ret->remote = remote;
 724         ret->url = url;
 725
 726         if (!prefixcmp(url, "rsync://")) {
 727                 ret->get_refs_list = get_refs_via_rsync;
 728                 ret->fetch = fetch_objs_via_rsync;
 729                 ret->push = rsync_transport_push;
 730
 731         } else if (!prefixcmp(url, "http://")
 732                 || !prefixcmp(url, "https://")
 733                 || !prefixcmp(url, "ftp://")) {
 734 #ifdef NO_CURL
 735                 error("git was compiled without libcurl support.");
 736 #else
 737                 ret->get_refs_list = get_refs_via_curl;
 738                 ret->fetch = fetch_objs_via_curl;
 739                 ret->push = curl_transport_push;
 740 #endif
 741                 ret->disconnect = disconnect_walker;
 742
 743         } else if (is_local(url) && is_file(url)) {
 744                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 745                 ret->data = data;
 746                 ret->get_refs_list = get_refs_from_bundle;
 747                 ret->fetch = fetch_refs_from_bundle;
 748                 ret->disconnect = close_bundle;
 749
 750         } else {
 751                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 752                 ret->data = data;
 753                 ret->set_option = set_git_option;
 754                 ret->get_refs_list = get_refs_via_connect;
 755                 ret->fetch = fetch_refs_via_pack;
 756                 ret->push = git_transport_push;
 757                 ret->disconnect = disconnect_git;
 758
 759                 data->thin = 1;
 760                 data->conn = NULL;
 761                 data->uploadpack = "git-upload-pack";
 762                 if (remote && remote->uploadpack)
 763                         data->uploadpack = remote->uploadpack;
 764                 data->receivepack = "git-receive-pack";
 765                 if (remote && remote->receivepack)
 766                         data->receivepack = remote->receivepack;
 767         }
 768
 769         return ret;
 770 }
 771
 772 int transport_set_option(struct transport *transport,
 773                          const char *name, const char *value)
 774 {
 775         if (transport->set_option)
 776                 return transport->set_option(transport, name, value);
 777         return 1;
 778 }
 779
 780 int transport_push(struct transport *transport,
 781                    int refspec_nr, const char **refspec, int flags)
 782 {
 783         if (!transport->push)
 784                 return 1;
 785         return transport->push(transport, refspec_nr, refspec, flags);
 786 }
 787
 788 const struct ref *transport_get_remote_refs(struct transport *transport)
 789 {
 790         if (!transport->remote_refs)
 791                 transport->remote_refs = transport->get_refs_list(transport);
 792         return transport->remote_refs;
 793 }
 794
 795 int transport_fetch_refs(struct transport *transport, const struct ref *refs)
 796 {
 797         int rc;
 798         int nr_heads = 0, nr_alloc = 0;
 799         const struct ref **heads = NULL;
 800         const struct ref *rm;
 801
 802         for (rm = refs; rm; rm = rm->next) {
 803                 if (rm->peer_ref &&
 804                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 805                         continue;
 806                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 807                 heads[nr_heads++] = rm;
 808         }
 809
 810         rc = transport->fetch(transport, nr_heads, heads);
 811         free(heads);
 812         return rc;
 813 }
 814
 815 void transport_unlock_pack(struct transport *transport)
 816 {
 817         if (transport->pack_lockfile) {
 818                 unlink(transport->pack_lockfile);
 819                 free(transport->pack_lockfile);
 820                 transport->pack_lockfile = NULL;
 821         }
 822 }
 823
 824 int transport_disconnect(struct transport *transport)
 825 {
 826         int ret = 0;
 827         if (transport->disconnect)
 828                 ret = transport->disconnect(transport);
 829         free(transport);
 830         return ret;
 831 }