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 const char *rsync_url(const char *url)
 142 {
 143         return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 144 }
 145
 146 static struct ref *get_refs_via_rsync(struct transport *transport)
 147 {
 148         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 149         struct ref dummy, *tail = &dummy;
 150         struct child_process rsync;
 151         const char *args[5];
 152         int temp_dir_len;
 153
 154         /* copy the refs to the temporary directory */
 155
 156         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 157         if (!mkdtemp(temp_dir.buf))
 158                 die ("Could not make temporary directory");
 159         temp_dir_len = temp_dir.len;
 160
 161         strbuf_addstr(&buf, rsync_url(transport->url));
 162         strbuf_addstr(&buf, "/refs");
 163
 164         memset(&rsync, 0, sizeof(rsync));
 165         rsync.argv = args;
 166         rsync.stdout_to_stderr = 1;
 167         args[0] = "rsync";
 168         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 169         args[2] = buf.buf;
 170         args[3] = temp_dir.buf;
 171         args[4] = NULL;
 172
 173         if (run_command(&rsync))
 174                 die ("Could not run rsync to get refs");
 175
 176         strbuf_reset(&buf);
 177         strbuf_addstr(&buf, rsync_url(transport->url));
 178         strbuf_addstr(&buf, "/packed-refs");
 179
 180         args[2] = buf.buf;
 181
 182         if (run_command(&rsync))
 183                 die ("Could not run rsync to get refs");
 184
 185         /* read the copied refs */
 186
 187         strbuf_addstr(&temp_dir, "/refs");
 188         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 189         strbuf_setlen(&temp_dir, temp_dir_len);
 190
 191         tail = &dummy;
 192         strbuf_addstr(&temp_dir, "/packed-refs");
 193         insert_packed_refs(temp_dir.buf, &tail);
 194         strbuf_setlen(&temp_dir, temp_dir_len);
 195
 196         if (remove_dir_recursively(&temp_dir, 0))
 197                 warning ("Error removing temporary directory %s.",
 198                                 temp_dir.buf);
 199
 200         strbuf_release(&buf);
 201         strbuf_release(&temp_dir);
 202
 203         return dummy.next;
 204 }
 205
 206 static int fetch_objs_via_rsync(struct transport *transport,
 207                                 int nr_objs, const struct ref **to_fetch)
 208 {
 209         struct strbuf buf = STRBUF_INIT;
 210         struct child_process rsync;
 211         const char *args[8];
 212         int result;
 213
 214         strbuf_addstr(&buf, rsync_url(transport->url));
 215         strbuf_addstr(&buf, "/objects/");
 216
 217         memset(&rsync, 0, sizeof(rsync));
 218         rsync.argv = args;
 219         rsync.stdout_to_stderr = 1;
 220         args[0] = "rsync";
 221         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 222         args[2] = "--ignore-existing";
 223         args[3] = "--exclude";
 224         args[4] = "info";
 225         args[5] = buf.buf;
 226         args[6] = get_object_directory();
 227         args[7] = NULL;
 228
 229         /* NEEDSWORK: handle one level of alternates */
 230         result = run_command(&rsync);
 231
 232         strbuf_release(&buf);
 233
 234         return result;
 235 }
 236
 237 static int write_one_ref(const char *name, const unsigned char *sha1,
 238                 int flags, void *data)
 239 {
 240         struct strbuf *buf = data;
 241         int len = buf->len;
 242         FILE *f;
 243
 244         /* when called via for_each_ref(), flags is non-zero */
 245         if (flags && prefixcmp(name, "refs/heads/") &&
 246                         prefixcmp(name, "refs/tags/"))
 247                 return 0;
 248
 249         strbuf_addstr(buf, name);
 250         if (safe_create_leading_directories(buf->buf) ||
 251                         !(f = fopen(buf->buf, "w")) ||
 252                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 253                         fclose(f))
 254                 return error("problems writing temporary file %s", buf->buf);
 255         strbuf_setlen(buf, len);
 256         return 0;
 257 }
 258
 259 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 260                 int refspec_nr, const char **refspec)
 261 {
 262         int i;
 263
 264         for (i = 0; i < refspec_nr; i++) {
 265                 unsigned char sha1[20];
 266                 char *ref;
 267
 268                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 269                         return error("Could not get ref %s", refspec[i]);
 270
 271                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 272                         free(ref);
 273                         return -1;
 274                 }
 275                 free(ref);
 276         }
 277         return 0;
 278 }
 279
 280 static int rsync_transport_push(struct transport *transport,
 281                 int refspec_nr, const char **refspec, int flags)
 282 {
 283         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 284         int result = 0, i;
 285         struct child_process rsync;
 286         const char *args[10];
 287
 288         if (flags & TRANSPORT_PUSH_MIRROR)
 289                 return error("rsync transport does not support mirror mode");
 290
 291         /* first push the objects */
 292
 293         strbuf_addstr(&buf, rsync_url(transport->url));
 294         strbuf_addch(&buf, '/');
 295
 296         memset(&rsync, 0, sizeof(rsync));
 297         rsync.argv = args;
 298         rsync.stdout_to_stderr = 1;
 299         i = 0;
 300         args[i++] = "rsync";
 301         args[i++] = "-a";
 302         if (flags & TRANSPORT_PUSH_DRY_RUN)
 303                 args[i++] = "--dry-run";
 304         if (transport->verbose > 0)
 305                 args[i++] = "-v";
 306         args[i++] = "--ignore-existing";
 307         args[i++] = "--exclude";
 308         args[i++] = "info";
 309         args[i++] = get_object_directory();
 310         args[i++] = buf.buf;
 311         args[i++] = NULL;
 312
 313         if (run_command(&rsync))
 314                 return error("Could not push objects to %s",
 315                                 rsync_url(transport->url));
 316
 317         /* copy the refs to the temporary directory; they could be packed. */
 318
 319         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 320         if (!mkdtemp(temp_dir.buf))
 321                 die ("Could not make temporary directory");
 322         strbuf_addch(&temp_dir, '/');
 323
 324         if (flags & TRANSPORT_PUSH_ALL) {
 325                 if (for_each_ref(write_one_ref, &temp_dir))
 326                         return -1;
 327         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 328                 return -1;
 329
 330         i = 2;
 331         if (flags & TRANSPORT_PUSH_DRY_RUN)
 332                 args[i++] = "--dry-run";
 333         if (!(flags & TRANSPORT_PUSH_FORCE))
 334                 args[i++] = "--ignore-existing";
 335         args[i++] = temp_dir.buf;
 336         args[i++] = rsync_url(transport->url);
 337         args[i++] = NULL;
 338         if (run_command(&rsync))
 339                 result = error("Could not push to %s",
 340                                 rsync_url(transport->url));
 341
 342         if (remove_dir_recursively(&temp_dir, 0))
 343                 warning ("Could not remove temporary directory %s.",
 344                                 temp_dir.buf);
 345
 346         strbuf_release(&buf);
 347         strbuf_release(&temp_dir);
 348
 349         return result;
 350 }
 351
 352 /* Generic functions for using commit walkers */
 353
 354 #ifndef NO_CURL /* http fetch is the only user */
 355 static int fetch_objs_via_walker(struct transport *transport,
 356                                  int nr_objs, const struct ref **to_fetch)
 357 {
 358         char *dest = xstrdup(transport->url);
 359         struct walker *walker = transport->data;
 360         char **objs = xmalloc(nr_objs * sizeof(*objs));
 361         int i;
 362
 363         walker->get_all = 1;
 364         walker->get_tree = 1;
 365         walker->get_history = 1;
 366         walker->get_verbosely = transport->verbose >= 0;
 367         walker->get_recover = 0;
 368
 369         for (i = 0; i < nr_objs; i++)
 370                 objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 371
 372         if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 373                 die("Fetch failed.");
 374
 375         for (i = 0; i < nr_objs; i++)
 376                 free(objs[i]);
 377         free(objs);
 378         free(dest);
 379         return 0;
 380 }
 381 #endif /* NO_CURL */
 382
 383 static int disconnect_walker(struct transport *transport)
 384 {
 385         struct walker *walker = transport->data;
 386         if (walker)
 387                 walker_free(walker);
 388         return 0;
 389 }
 390
 391 #ifndef NO_CURL
 392 static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 393 {
 394         const char **argv;
 395         int argc;
 396         int err;
 397
 398         if (flags & TRANSPORT_PUSH_MIRROR)
 399                 return error("http transport does not support mirror mode");
 400
 401         argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 402         argv[0] = "http-push";
 403         argc = 1;
 404         if (flags & TRANSPORT_PUSH_ALL)
 405                 argv[argc++] = "--all";
 406         if (flags & TRANSPORT_PUSH_FORCE)
 407                 argv[argc++] = "--force";
 408         if (flags & TRANSPORT_PUSH_DRY_RUN)
 409                 argv[argc++] = "--dry-run";
 410         if (flags & TRANSPORT_PUSH_VERBOSE)
 411                 argv[argc++] = "--verbose";
 412         argv[argc++] = transport->url;
 413         while (refspec_nr--)
 414                 argv[argc++] = *refspec++;
 415         argv[argc] = NULL;
 416         err = run_command_v_opt(argv, RUN_GIT_CMD);
 417         switch (err) {
 418         case -ERR_RUN_COMMAND_FORK:
 419                 error("unable to fork for %s", argv[0]);
 420         case -ERR_RUN_COMMAND_EXEC:
 421                 error("unable to exec %s", argv[0]);
 422                 break;
 423         case -ERR_RUN_COMMAND_WAITPID:
 424         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 425         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 426         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 427                 error("%s died with strange error", argv[0]);
 428         }
 429         return !!err;
 430 }
 431
 432 static struct ref *get_refs_via_curl(struct transport *transport)
 433 {
 434         struct strbuf buffer = STRBUF_INIT;
 435         char *data, *start, *mid;
 436         char *ref_name;
 437         char *refs_url;
 438         int i = 0;
 439
 440         struct active_request_slot *slot;
 441         struct slot_results results;
 442
 443         struct ref *refs = NULL;
 444         struct ref *ref = NULL;
 445         struct ref *last_ref = NULL;
 446
 447         struct walker *walker;
 448
 449         if (!transport->data)
 450                 transport->data = get_http_walker(transport->url,
 451                                                 transport->remote);
 452
 453         walker = transport->data;
 454
 455         refs_url = xmalloc(strlen(transport->url) + 11);
 456         sprintf(refs_url, "%s/info/refs", transport->url);
 457
 458         slot = get_active_slot();
 459         slot->results = &results;
 460         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 461         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 462         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 463         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 464
 465         if (start_active_slot(slot)) {
 466                 run_active_slot(slot);
 467                 if (results.curl_result != CURLE_OK) {
 468                         strbuf_release(&buffer);
 469                         if (missing_target(&results))
 470                                 die("%s not found: did you run git update-server-info on the server?", refs_url);
 471                         else
 472                                 die("%s download error - %s", refs_url, curl_errorstr);
 473                 }
 474         } else {
 475                 strbuf_release(&buffer);
 476                 die("Unable to start HTTP request");
 477         }
 478
 479         data = buffer.buf;
 480         start = NULL;
 481         mid = data;
 482         while (i < buffer.len) {
 483                 if (!start)
 484                         start = &data[i];
 485                 if (data[i] == '\t')
 486                         mid = &data[i];
 487                 if (data[i] == '\n') {
 488                         data[i] = 0;
 489                         ref_name = mid + 1;
 490                         ref = xmalloc(sizeof(struct ref) +
 491                                       strlen(ref_name) + 1);
 492                         memset(ref, 0, sizeof(struct ref));
 493                         strcpy(ref->name, ref_name);
 494                         get_sha1_hex(start, ref->old_sha1);
 495                         if (!refs)
 496                                 refs = ref;
 497                         if (last_ref)
 498                                 last_ref->next = ref;
 499                         last_ref = ref;
 500                         start = NULL;
 501                 }
 502                 i++;
 503         }
 504
 505         strbuf_release(&buffer);
 506
 507         ref = alloc_ref("HEAD");
 508         if (!walker->fetch_ref(walker, ref) &&
 509             !resolve_remote_symref(ref, refs)) {
 510                 ref->next = refs;
 511                 refs = ref;
 512         } else {
 513                 free(ref);
 514         }
 515
 516         return refs;
 517 }
 518
 519 static int fetch_objs_via_curl(struct transport *transport,
 520                                  int nr_objs, const struct ref **to_fetch)
 521 {
 522         if (!transport->data)
 523                 transport->data = get_http_walker(transport->url,
 524                                                 transport->remote);
 525         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 526 }
 527
 528 #endif
 529
 530 struct bundle_transport_data {
 531         int fd;
 532         struct bundle_header header;
 533 };
 534
 535 static struct ref *get_refs_from_bundle(struct transport *transport)
 536 {
 537         struct bundle_transport_data *data = transport->data;
 538         struct ref *result = NULL;
 539         int i;
 540
 541         if (data->fd > 0)
 542                 close(data->fd);
 543         data->fd = read_bundle_header(transport->url, &data->header);
 544         if (data->fd < 0)
 545                 die ("Could not read bundle '%s'.", transport->url);
 546         for (i = 0; i < data->header.references.nr; i++) {
 547                 struct ref_list_entry *e = data->header.references.list + i;
 548                 struct ref *ref = alloc_ref(e->name);
 549                 hashcpy(ref->old_sha1, e->sha1);
 550                 ref->next = result;
 551                 result = ref;
 552         }
 553         return result;
 554 }
 555
 556 static int fetch_refs_from_bundle(struct transport *transport,
 557                                int nr_heads, const struct ref **to_fetch)
 558 {
 559         struct bundle_transport_data *data = transport->data;
 560         return unbundle(&data->header, data->fd);
 561 }
 562
 563 static int close_bundle(struct transport *transport)
 564 {
 565         struct bundle_transport_data *data = transport->data;
 566         if (data->fd > 0)
 567                 close(data->fd);
 568         free(data);
 569         return 0;
 570 }
 571
 572 struct git_transport_data {
 573         unsigned thin : 1;
 574         unsigned keep : 1;
 575         unsigned followtags : 1;
 576         int depth;
 577         struct child_process *conn;
 578         int fd[2];
 579         const char *uploadpack;
 580         const char *receivepack;
 581 };
 582
 583 static int set_git_option(struct transport *connection,
 584                           const char *name, const char *value)
 585 {
 586         struct git_transport_data *data = connection->data;
 587         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 588                 data->uploadpack = value;
 589                 return 0;
 590         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 591                 data->receivepack = value;
 592                 return 0;
 593         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 594                 data->thin = !!value;
 595                 return 0;
 596         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 597                 data->followtags = !!value;
 598                 return 0;
 599         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 600                 data->keep = !!value;
 601                 return 0;
 602         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 603                 if (!value)
 604                         data->depth = 0;
 605                 else
 606                         data->depth = atoi(value);
 607                 return 0;
 608         }
 609         return 1;
 610 }
 611
 612 static int connect_setup(struct transport *transport)
 613 {
 614         struct git_transport_data *data = transport->data;
 615         data->conn = git_connect(data->fd, transport->url, data->uploadpack, 0);
 616         return 0;
 617 }
 618
 619 static struct ref *get_refs_via_connect(struct transport *transport)
 620 {
 621         struct git_transport_data *data = transport->data;
 622         struct ref *refs;
 623
 624         connect_setup(transport);
 625         get_remote_heads(data->fd[0], &refs, 0, NULL, 0, NULL);
 626
 627         return refs;
 628 }
 629
 630 static int fetch_refs_via_pack(struct transport *transport,
 631                                int nr_heads, const struct ref **to_fetch)
 632 {
 633         struct git_transport_data *data = transport->data;
 634         char **heads = xmalloc(nr_heads * sizeof(*heads));
 635         char **origh = xmalloc(nr_heads * sizeof(*origh));
 636         const struct ref *refs;
 637         char *dest = xstrdup(transport->url);
 638         struct fetch_pack_args args;
 639         int i;
 640         struct ref *refs_tmp = NULL;
 641
 642         memset(&args, 0, sizeof(args));
 643         args.uploadpack = data->uploadpack;
 644         args.keep_pack = data->keep;
 645         args.lock_pack = 1;
 646         args.use_thin_pack = data->thin;
 647         args.include_tag = data->followtags;
 648         args.verbose = (transport->verbose > 0);
 649         args.quiet = (transport->verbose < 0);
 650         args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 651         args.depth = data->depth;
 652
 653         for (i = 0; i < nr_heads; i++)
 654                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 655
 656         if (!data->conn) {
 657                 connect_setup(transport);
 658                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 659         }
 660
 661         refs = fetch_pack(&args, data->fd, data->conn,
 662                           refs_tmp ? refs_tmp : transport->remote_refs,
 663                           dest, nr_heads, heads, &transport->pack_lockfile);
 664         close(data->fd[0]);
 665         close(data->fd[1]);
 666         if (finish_connect(data->conn))
 667                 refs = NULL;
 668         data->conn = NULL;
 669
 670         free_refs(refs_tmp);
 671
 672         for (i = 0; i < nr_heads; i++)
 673                 free(origh[i]);
 674         free(origh);
 675         free(heads);
 676         free(dest);
 677         return (refs ? 0 : -1);
 678 }
 679
 680 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 681 {
 682         struct git_transport_data *data = transport->data;
 683         struct send_pack_args args;
 684
 685         args.receivepack = data->receivepack;
 686         args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
 687         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 688         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 689         args.use_thin_pack = data->thin;
 690         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 691         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 692
 693         return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
 694 }
 695
 696 static int disconnect_git(struct transport *transport)
 697 {
 698         struct git_transport_data *data = transport->data;
 699         if (data->conn) {
 700                 packet_flush(data->fd[1]);
 701                 close(data->fd[0]);
 702                 close(data->fd[1]);
 703                 finish_connect(data->conn);
 704         }
 705
 706         free(data);
 707         return 0;
 708 }
 709
 710 static int is_local(const char *url)
 711 {
 712         const char *colon = strchr(url, ':');
 713         const char *slash = strchr(url, '/');
 714         return !colon || (slash && slash < colon) ||
 715                 has_dos_drive_prefix(url);
 716 }
 717
 718 static int is_file(const char *url)
 719 {
 720         struct stat buf;
 721         if (stat(url, &buf))
 722                 return 0;
 723         return S_ISREG(buf.st_mode);
 724 }
 725
 726 struct transport *transport_get(struct remote *remote, const char *url)
 727 {
 728         struct transport *ret = xcalloc(1, sizeof(*ret));
 729
 730         ret->remote = remote;
 731         ret->url = url;
 732
 733         if (!prefixcmp(url, "rsync:")) {
 734                 ret->get_refs_list = get_refs_via_rsync;
 735                 ret->fetch = fetch_objs_via_rsync;
 736                 ret->push = rsync_transport_push;
 737
 738         } else if (!prefixcmp(url, "http://")
 739                 || !prefixcmp(url, "https://")
 740                 || !prefixcmp(url, "ftp://")) {
 741 #ifdef NO_CURL
 742                 error("git was compiled without libcurl support.");
 743 #else
 744                 ret->get_refs_list = get_refs_via_curl;
 745                 ret->fetch = fetch_objs_via_curl;
 746                 ret->push = curl_transport_push;
 747 #endif
 748                 ret->disconnect = disconnect_walker;
 749
 750         } else if (is_local(url) && is_file(url)) {
 751                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 752                 ret->data = data;
 753                 ret->get_refs_list = get_refs_from_bundle;
 754                 ret->fetch = fetch_refs_from_bundle;
 755                 ret->disconnect = close_bundle;
 756
 757         } else {
 758                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 759                 ret->data = data;
 760                 ret->set_option = set_git_option;
 761                 ret->get_refs_list = get_refs_via_connect;
 762                 ret->fetch = fetch_refs_via_pack;
 763                 ret->push = git_transport_push;
 764                 ret->disconnect = disconnect_git;
 765
 766                 data->thin = 1;
 767                 data->conn = NULL;
 768                 data->uploadpack = "git-upload-pack";
 769                 if (remote && remote->uploadpack)
 770                         data->uploadpack = remote->uploadpack;
 771                 data->receivepack = "git-receive-pack";
 772                 if (remote && remote->receivepack)
 773                         data->receivepack = remote->receivepack;
 774         }
 775
 776         return ret;
 777 }
 778
 779 int transport_set_option(struct transport *transport,
 780                          const char *name, const char *value)
 781 {
 782         if (transport->set_option)
 783                 return transport->set_option(transport, name, value);
 784         return 1;
 785 }
 786
 787 int transport_push(struct transport *transport,
 788                    int refspec_nr, const char **refspec, int flags)
 789 {
 790         if (!transport->push)
 791                 return 1;
 792         return transport->push(transport, refspec_nr, refspec, flags);
 793 }
 794
 795 const struct ref *transport_get_remote_refs(struct transport *transport)
 796 {
 797         if (!transport->remote_refs)
 798                 transport->remote_refs = transport->get_refs_list(transport);
 799         return transport->remote_refs;
 800 }
 801
 802 int transport_fetch_refs(struct transport *transport, const struct ref *refs)
 803 {
 804         int rc;
 805         int nr_heads = 0, nr_alloc = 0;
 806         const struct ref **heads = NULL;
 807         const struct ref *rm;
 808
 809         for (rm = refs; rm; rm = rm->next) {
 810                 if (rm->peer_ref &&
 811                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 812                         continue;
 813                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 814                 heads[nr_heads++] = rm;
 815         }
 816
 817         rc = transport->fetch(transport, nr_heads, heads);
 818         free(heads);
 819         return rc;
 820 }
 821
 822 void transport_unlock_pack(struct transport *transport)
 823 {
 824         if (transport->pack_lockfile) {
 825                 unlink(transport->pack_lockfile);
 826                 free(transport->pack_lockfile);
 827                 transport->pack_lockfile = NULL;
 828         }
 829 }
 830
 831 int transport_disconnect(struct transport *transport)
 832 {
 833         int ret = 0;
 834         if (transport->disconnect)
 835                 ret = transport->disconnect(transport);
 836         free(transport);
 837         return ret;
 838 }