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->buf + name_offset);
  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                         (*tail)->next = next;
  87                         *tail = next;
  88                 }
  89         }
  90         strbuf_setlen(path, pathlen);
  91
  92         for (i = 0; i < list.nr; i++)
  93                 free(list.entries[i]);
  94         free(list.entries);
  95
  96         return 0;
  97 }
  98
  99 /* insert the packed refs for which no loose refs were found */
 100
 101 static void insert_packed_refs(const char *packed_refs, struct ref **list)
 102 {
 103         FILE *f = fopen(packed_refs, "r");
 104         static char buffer[PATH_MAX];
 105
 106         if (!f)
 107                 return;
 108
 109         for (;;) {
 110                 int cmp = cmp, len;
 111
 112                 if (!fgets(buffer, sizeof(buffer), f)) {
 113                         fclose(f);
 114                         return;
 115                 }
 116
 117                 if (hexval(buffer[0]) > 0xf)
 118                         continue;
 119                 len = strlen(buffer);
 120                 if (len && buffer[len - 1] == '\n')
 121                         buffer[--len] = '\0';
 122                 if (len < 41)
 123                         continue;
 124                 while ((*list)->next &&
 125                                 (cmp = strcmp(buffer + 41,
 126                                       (*list)->next->name)) > 0)
 127                         list = &(*list)->next;
 128                 if (!(*list)->next || cmp < 0) {
 129                         struct ref *next = alloc_ref(buffer + 41);
 130                         buffer[40] = '\0';
 131                         if (get_sha1_hex(buffer, next->old_sha1)) {
 132                                 warning ("invalid SHA-1: %s", buffer);
 133                                 free(next);
 134                                 continue;
 135                         }
 136                         next->next = (*list)->next;
 137                         (*list)->next = next;
 138                         list = &(*list)->next;
 139                 }
 140         }
 141 }
 142
 143 static struct ref *get_refs_via_rsync(struct transport *transport)
 144 {
 145         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 146         struct ref dummy, *tail = &dummy;
 147         struct child_process rsync;
 148         const char *args[5];
 149         int temp_dir_len;
 150
 151         /* copy the refs to the temporary directory */
 152
 153         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 154         if (!mkdtemp(temp_dir.buf))
 155                 die ("Could not make temporary directory");
 156         temp_dir_len = temp_dir.len;
 157
 158         strbuf_addstr(&buf, transport->url);
 159         strbuf_addstr(&buf, "/refs");
 160
 161         memset(&rsync, 0, sizeof(rsync));
 162         rsync.argv = args;
 163         rsync.stdout_to_stderr = 1;
 164         args[0] = "rsync";
 165         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 166         args[2] = buf.buf;
 167         args[3] = temp_dir.buf;
 168         args[4] = NULL;
 169
 170         if (run_command(&rsync))
 171                 die ("Could not run rsync to get refs");
 172
 173         strbuf_reset(&buf);
 174         strbuf_addstr(&buf, transport->url);
 175         strbuf_addstr(&buf, "/packed-refs");
 176
 177         args[2] = buf.buf;
 178
 179         if (run_command(&rsync))
 180                 die ("Could not run rsync to get refs");
 181
 182         /* read the copied refs */
 183
 184         strbuf_addstr(&temp_dir, "/refs");
 185         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 186         strbuf_setlen(&temp_dir, temp_dir_len);
 187
 188         tail = &dummy;
 189         strbuf_addstr(&temp_dir, "/packed-refs");
 190         insert_packed_refs(temp_dir.buf, &tail);
 191         strbuf_setlen(&temp_dir, temp_dir_len);
 192
 193         if (remove_dir_recursively(&temp_dir, 0))
 194                 warning ("Error removing temporary directory %s.",
 195                                 temp_dir.buf);
 196
 197         strbuf_release(&buf);
 198         strbuf_release(&temp_dir);
 199
 200         return dummy.next;
 201 }
 202
 203 static int fetch_objs_via_rsync(struct transport *transport,
 204                                 int nr_objs, const struct ref **to_fetch)
 205 {
 206         struct strbuf buf = STRBUF_INIT;
 207         struct child_process rsync;
 208         const char *args[8];
 209         int result;
 210
 211         strbuf_addstr(&buf, transport->url);
 212         strbuf_addstr(&buf, "/objects/");
 213
 214         memset(&rsync, 0, sizeof(rsync));
 215         rsync.argv = args;
 216         rsync.stdout_to_stderr = 1;
 217         args[0] = "rsync";
 218         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 219         args[2] = "--ignore-existing";
 220         args[3] = "--exclude";
 221         args[4] = "info";
 222         args[5] = buf.buf;
 223         args[6] = get_object_directory();
 224         args[7] = NULL;
 225
 226         /* NEEDSWORK: handle one level of alternates */
 227         result = run_command(&rsync);
 228
 229         strbuf_release(&buf);
 230
 231         return result;
 232 }
 233
 234 static int write_one_ref(const char *name, const unsigned char *sha1,
 235                 int flags, void *data)
 236 {
 237         struct strbuf *buf = data;
 238         int len = buf->len;
 239         FILE *f;
 240
 241         /* when called via for_each_ref(), flags is non-zero */
 242         if (flags && prefixcmp(name, "refs/heads/") &&
 243                         prefixcmp(name, "refs/tags/"))
 244                 return 0;
 245
 246         strbuf_addstr(buf, name);
 247         if (safe_create_leading_directories(buf->buf) ||
 248                         !(f = fopen(buf->buf, "w")) ||
 249                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 250                         fclose(f))
 251                 return error("problems writing temporary file %s", buf->buf);
 252         strbuf_setlen(buf, len);
 253         return 0;
 254 }
 255
 256 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 257                 int refspec_nr, const char **refspec)
 258 {
 259         int i;
 260
 261         for (i = 0; i < refspec_nr; i++) {
 262                 unsigned char sha1[20];
 263                 char *ref;
 264
 265                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 266                         return error("Could not get ref %s", refspec[i]);
 267
 268                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 269                         free(ref);
 270                         return -1;
 271                 }
 272                 free(ref);
 273         }
 274         return 0;
 275 }
 276
 277 static int rsync_transport_push(struct transport *transport,
 278                 int refspec_nr, const char **refspec, int flags)
 279 {
 280         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 281         int result = 0, i;
 282         struct child_process rsync;
 283         const char *args[10];
 284
 285         if (flags & TRANSPORT_PUSH_MIRROR)
 286                 return error("rsync transport does not support mirror mode");
 287
 288         /* first push the objects */
 289
 290         strbuf_addstr(&buf, transport->url);
 291         strbuf_addch(&buf, '/');
 292
 293         memset(&rsync, 0, sizeof(rsync));
 294         rsync.argv = args;
 295         rsync.stdout_to_stderr = 1;
 296         i = 0;
 297         args[i++] = "rsync";
 298         args[i++] = "-a";
 299         if (flags & TRANSPORT_PUSH_DRY_RUN)
 300                 args[i++] = "--dry-run";
 301         if (transport->verbose > 0)
 302                 args[i++] = "-v";
 303         args[i++] = "--ignore-existing";
 304         args[i++] = "--exclude";
 305         args[i++] = "info";
 306         args[i++] = get_object_directory();
 307         args[i++] = buf.buf;
 308         args[i++] = NULL;
 309
 310         if (run_command(&rsync))
 311                 return error("Could not push objects to %s", transport->url);
 312
 313         /* copy the refs to the temporary directory; they could be packed. */
 314
 315         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 316         if (!mkdtemp(temp_dir.buf))
 317                 die ("Could not make temporary directory");
 318         strbuf_addch(&temp_dir, '/');
 319
 320         if (flags & TRANSPORT_PUSH_ALL) {
 321                 if (for_each_ref(write_one_ref, &temp_dir))
 322                         return -1;
 323         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 324                 return -1;
 325
 326         i = 2;
 327         if (flags & TRANSPORT_PUSH_DRY_RUN)
 328                 args[i++] = "--dry-run";
 329         if (!(flags & TRANSPORT_PUSH_FORCE))
 330                 args[i++] = "--ignore-existing";
 331         args[i++] = temp_dir.buf;
 332         args[i++] = transport->url;
 333         args[i++] = NULL;
 334         if (run_command(&rsync))
 335                 result = error("Could not push to %s", transport->url);
 336
 337         if (remove_dir_recursively(&temp_dir, 0))
 338                 warning ("Could not remove temporary directory %s.",
 339                                 temp_dir.buf);
 340
 341         strbuf_release(&buf);
 342         strbuf_release(&temp_dir);
 343
 344         return result;
 345 }
 346
 347 /* Generic functions for using commit walkers */
 348
 349 #ifndef NO_CURL /* http fetch is the only user */
 350 static int fetch_objs_via_walker(struct transport *transport,
 351                                  int nr_objs, const struct ref **to_fetch)
 352 {
 353         char *dest = xstrdup(transport->url);
 354         struct walker *walker = transport->data;
 355         char **objs = xmalloc(nr_objs * sizeof(*objs));
 356         int i;
 357
 358         walker->get_all = 1;
 359         walker->get_tree = 1;
 360         walker->get_history = 1;
 361         walker->get_verbosely = transport->verbose >= 0;
 362         walker->get_recover = 0;
 363
 364         for (i = 0; i < nr_objs; i++)
 365                 objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 366
 367         if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 368                 die("Fetch failed.");
 369
 370         for (i = 0; i < nr_objs; i++)
 371                 free(objs[i]);
 372         free(objs);
 373         free(dest);
 374         return 0;
 375 }
 376 #endif /* NO_CURL */
 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 + 12) * 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         if (flags & TRANSPORT_PUSH_VERBOSE)
 406                 argv[argc++] = "--verbose";
 407         argv[argc++] = transport->url;
 408         while (refspec_nr--)
 409                 argv[argc++] = *refspec++;
 410         argv[argc] = NULL;
 411         err = run_command_v_opt(argv, RUN_GIT_CMD);
 412         switch (err) {
 413         case -ERR_RUN_COMMAND_FORK:
 414                 error("unable to fork for %s", argv[0]);
 415         case -ERR_RUN_COMMAND_EXEC:
 416                 error("unable to exec %s", argv[0]);
 417                 break;
 418         case -ERR_RUN_COMMAND_WAITPID:
 419         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 420         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 421         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 422                 error("%s died with strange error", argv[0]);
 423         }
 424         return !!err;
 425 }
 426
 427 static struct ref *get_refs_via_curl(struct transport *transport)
 428 {
 429         struct strbuf buffer = STRBUF_INIT;
 430         char *data, *start, *mid;
 431         char *ref_name;
 432         char *refs_url;
 433         int i = 0;
 434
 435         struct active_request_slot *slot;
 436         struct slot_results results;
 437
 438         struct ref *refs = NULL;
 439         struct ref *ref = NULL;
 440         struct ref *last_ref = NULL;
 441
 442         struct walker *walker;
 443
 444         if (!transport->data)
 445                 transport->data = get_http_walker(transport->url,
 446                                                 transport->remote);
 447
 448         walker = transport->data;
 449
 450         refs_url = xmalloc(strlen(transport->url) + 11);
 451         sprintf(refs_url, "%s/info/refs", transport->url);
 452
 453         slot = get_active_slot();
 454         slot->results = &results;
 455         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 456         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 457         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 458         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 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                                 die("%s not found: did you run git update-server-info on the server?", refs_url);
 466                         else
 467                                 die("%s download error - %s", refs_url, curl_errorstr);
 468                 }
 469         } else {
 470                 strbuf_release(&buffer);
 471                 die("Unable to start HTTP request");
 472         }
 473
 474         data = buffer.buf;
 475         start = NULL;
 476         mid = data;
 477         while (i < buffer.len) {
 478                 if (!start)
 479                         start = &data[i];
 480                 if (data[i] == '\t')
 481                         mid = &data[i];
 482                 if (data[i] == '\n') {
 483                         data[i] = 0;
 484                         ref_name = mid + 1;
 485                         ref = xmalloc(sizeof(struct ref) +
 486                                       strlen(ref_name) + 1);
 487                         memset(ref, 0, sizeof(struct ref));
 488                         strcpy(ref->name, ref_name);
 489                         get_sha1_hex(start, ref->old_sha1);
 490                         if (!refs)
 491                                 refs = ref;
 492                         if (last_ref)
 493                                 last_ref->next = ref;
 494                         last_ref = ref;
 495                         start = NULL;
 496                 }
 497                 i++;
 498         }
 499
 500         strbuf_release(&buffer);
 501
 502         ref = alloc_ref("HEAD");
 503         if (!walker->fetch_ref(walker, ref) &&
 504             !resolve_remote_symref(ref, refs)) {
 505                 ref->next = refs;
 506                 refs = ref;
 507         } else {
 508                 free(ref);
 509         }
 510
 511         return refs;
 512 }
 513
 514 static int fetch_objs_via_curl(struct transport *transport,
 515                                  int nr_objs, const struct ref **to_fetch)
 516 {
 517         if (!transport->data)
 518                 transport->data = get_http_walker(transport->url,
 519                                                 transport->remote);
 520         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 521 }
 522
 523 #endif
 524
 525 struct bundle_transport_data {
 526         int fd;
 527         struct bundle_header header;
 528 };
 529
 530 static struct ref *get_refs_from_bundle(struct transport *transport)
 531 {
 532         struct bundle_transport_data *data = transport->data;
 533         struct ref *result = NULL;
 534         int i;
 535
 536         if (data->fd > 0)
 537                 close(data->fd);
 538         data->fd = read_bundle_header(transport->url, &data->header);
 539         if (data->fd < 0)
 540                 die ("Could not read bundle '%s'.", transport->url);
 541         for (i = 0; i < data->header.references.nr; i++) {
 542                 struct ref_list_entry *e = data->header.references.list + i;
 543                 struct ref *ref = alloc_ref(e->name);
 544                 hashcpy(ref->old_sha1, e->sha1);
 545                 ref->next = result;
 546                 result = ref;
 547         }
 548         return result;
 549 }
 550
 551 static int fetch_refs_from_bundle(struct transport *transport,
 552                                int nr_heads, const struct ref **to_fetch)
 553 {
 554         struct bundle_transport_data *data = transport->data;
 555         return unbundle(&data->header, data->fd);
 556 }
 557
 558 static int close_bundle(struct transport *transport)
 559 {
 560         struct bundle_transport_data *data = transport->data;
 561         if (data->fd > 0)
 562                 close(data->fd);
 563         free(data);
 564         return 0;
 565 }
 566
 567 struct git_transport_data {
 568         unsigned thin : 1;
 569         unsigned keep : 1;
 570         unsigned followtags : 1;
 571         int depth;
 572         struct child_process *conn;
 573         int fd[2];
 574         const char *uploadpack;
 575         const char *receivepack;
 576 };
 577
 578 static int set_git_option(struct transport *connection,
 579                           const char *name, const char *value)
 580 {
 581         struct git_transport_data *data = connection->data;
 582         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 583                 data->uploadpack = value;
 584                 return 0;
 585         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 586                 data->receivepack = value;
 587                 return 0;
 588         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 589                 data->thin = !!value;
 590                 return 0;
 591         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 592                 data->followtags = !!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 int connect_setup(struct transport *transport)
 608 {
 609         struct git_transport_data *data = transport->data;
 610         data->conn = git_connect(data->fd, transport->url, data->uploadpack, 0);
 611         return 0;
 612 }
 613
 614 static struct ref *get_refs_via_connect(struct transport *transport)
 615 {
 616         struct git_transport_data *data = transport->data;
 617         struct ref *refs;
 618
 619         connect_setup(transport);
 620         get_remote_heads(data->fd[0], &refs, 0, NULL, 0, NULL);
 621
 622         return refs;
 623 }
 624
 625 static int fetch_refs_via_pack(struct transport *transport,
 626                                int nr_heads, const 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         const struct ref *refs;
 632         char *dest = xstrdup(transport->url);
 633         struct fetch_pack_args args;
 634         int i;
 635         struct ref *refs_tmp = NULL;
 636
 637         memset(&args, 0, sizeof(args));
 638         args.uploadpack = data->uploadpack;
 639         args.keep_pack = data->keep;
 640         args.lock_pack = 1;
 641         args.use_thin_pack = data->thin;
 642         args.include_tag = data->followtags;
 643         args.verbose = (transport->verbose > 0);
 644         args.quiet = (transport->verbose < 0);
 645         args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 646         args.depth = data->depth;
 647
 648         for (i = 0; i < nr_heads; i++)
 649                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 650
 651         if (!data->conn) {
 652                 connect_setup(transport);
 653                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 654         }
 655
 656         refs = fetch_pack(&args, data->fd, data->conn,
 657                           refs_tmp ? refs_tmp : transport->remote_refs,
 658                           dest, nr_heads, heads, &transport->pack_lockfile);
 659         close(data->fd[0]);
 660         close(data->fd[1]);
 661         if (finish_connect(data->conn))
 662                 refs = NULL;
 663         data->conn = NULL;
 664
 665         free_refs(refs_tmp);
 666
 667         for (i = 0; i < nr_heads; i++)
 668                 free(origh[i]);
 669         free(origh);
 670         free(heads);
 671         free(dest);
 672         return (refs ? 0 : -1);
 673 }
 674
 675 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 676 {
 677         struct git_transport_data *data = transport->data;
 678         struct send_pack_args args;
 679
 680         args.receivepack = data->receivepack;
 681         args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
 682         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 683         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 684         args.use_thin_pack = data->thin;
 685         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 686         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 687
 688         return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
 689 }
 690
 691 static int disconnect_git(struct transport *transport)
 692 {
 693         struct git_transport_data *data = transport->data;
 694         if (data->conn) {
 695                 packet_flush(data->fd[1]);
 696                 close(data->fd[0]);
 697                 close(data->fd[1]);
 698                 finish_connect(data->conn);
 699         }
 700
 701         free(data);
 702         return 0;
 703 }
 704
 705 static int is_local(const char *url)
 706 {
 707         const char *colon = strchr(url, ':');
 708         const char *slash = strchr(url, '/');
 709         return !colon || (slash && slash < colon) ||
 710                 has_dos_drive_prefix(url);
 711 }
 712
 713 static int is_file(const char *url)
 714 {
 715         struct stat buf;
 716         if (stat(url, &buf))
 717                 return 0;
 718         return S_ISREG(buf.st_mode);
 719 }
 720
 721 struct transport *transport_get(struct remote *remote, const char *url)
 722 {
 723         struct transport *ret = xcalloc(1, sizeof(*ret));
 724
 725         ret->remote = remote;
 726         ret->url = url;
 727
 728         if (!prefixcmp(url, "rsync://")) {
 729                 ret->get_refs_list = get_refs_via_rsync;
 730                 ret->fetch = fetch_objs_via_rsync;
 731                 ret->push = rsync_transport_push;
 732
 733         } else if (!prefixcmp(url, "http://")
 734                 || !prefixcmp(url, "https://")
 735                 || !prefixcmp(url, "ftp://")) {
 736 #ifdef NO_CURL
 737                 error("git was compiled without libcurl support.");
 738 #else
 739                 ret->get_refs_list = get_refs_via_curl;
 740                 ret->fetch = fetch_objs_via_curl;
 741                 ret->push = curl_transport_push;
 742 #endif
 743                 ret->disconnect = disconnect_walker;
 744
 745         } else if (is_local(url) && is_file(url)) {
 746                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 747                 ret->data = data;
 748                 ret->get_refs_list = get_refs_from_bundle;
 749                 ret->fetch = fetch_refs_from_bundle;
 750                 ret->disconnect = close_bundle;
 751
 752         } else {
 753                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 754                 ret->data = data;
 755                 ret->set_option = set_git_option;
 756                 ret->get_refs_list = get_refs_via_connect;
 757                 ret->fetch = fetch_refs_via_pack;
 758                 ret->push = git_transport_push;
 759                 ret->disconnect = disconnect_git;
 760
 761                 data->thin = 1;
 762                 data->conn = NULL;
 763                 data->uploadpack = "git-upload-pack";
 764                 if (remote && remote->uploadpack)
 765                         data->uploadpack = remote->uploadpack;
 766                 data->receivepack = "git-receive-pack";
 767                 if (remote && remote->receivepack)
 768                         data->receivepack = remote->receivepack;
 769         }
 770
 771         return ret;
 772 }
 773
 774 int transport_set_option(struct transport *transport,
 775                          const char *name, const char *value)
 776 {
 777         if (transport->set_option)
 778                 return transport->set_option(transport, name, value);
 779         return 1;
 780 }
 781
 782 int transport_push(struct transport *transport,
 783                    int refspec_nr, const char **refspec, int flags)
 784 {
 785         if (!transport->push)
 786                 return 1;
 787         return transport->push(transport, refspec_nr, refspec, flags);
 788 }
 789
 790 const struct ref *transport_get_remote_refs(struct transport *transport)
 791 {
 792         if (!transport->remote_refs)
 793                 transport->remote_refs = transport->get_refs_list(transport);
 794         return transport->remote_refs;
 795 }
 796
 797 int transport_fetch_refs(struct transport *transport, const struct ref *refs)
 798 {
 799         int rc;
 800         int nr_heads = 0, nr_alloc = 0;
 801         const struct ref **heads = NULL;
 802         const struct ref *rm;
 803
 804         for (rm = refs; rm; rm = rm->next) {
 805                 if (rm->peer_ref &&
 806                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 807                         continue;
 808                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 809                 heads[nr_heads++] = rm;
 810         }
 811
 812         rc = transport->fetch(transport, nr_heads, heads);
 813         free(heads);
 814         return rc;
 815 }
 816
 817 void transport_unlock_pack(struct transport *transport)
 818 {
 819         if (transport->pack_lockfile) {
 820                 unlink(transport->pack_lockfile);
 821                 free(transport->pack_lockfile);
 822                 transport->pack_lockfile = NULL;
 823         }
 824 }
 825
 826 int transport_disconnect(struct transport *transport)
 827 {
 828         int ret = 0;
 829         if (transport->disconnect)
 830                 ret = transport->disconnect(transport);
 831         free(transport);
 832         return ret;
 833 }