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, int for_push)
 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         if (for_push)
 150                 return NULL;
 151
 152         /* copy the refs to the temporary directory */
 153
 154         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 155         if (!mkdtemp(temp_dir.buf))
 156                 die ("Could not make temporary directory");
 157         temp_dir_len = temp_dir.len;
 158
 159         strbuf_addstr(&buf, transport->url);
 160         strbuf_addstr(&buf, "/refs");
 161
 162         memset(&rsync, 0, sizeof(rsync));
 163         rsync.argv = args;
 164         rsync.stdout_to_stderr = 1;
 165         args[0] = "rsync";
 166         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 167         args[2] = buf.buf;
 168         args[3] = temp_dir.buf;
 169         args[4] = NULL;
 170
 171         if (run_command(&rsync))
 172                 die ("Could not run rsync to get refs");
 173
 174         strbuf_reset(&buf);
 175         strbuf_addstr(&buf, transport->url);
 176         strbuf_addstr(&buf, "/packed-refs");
 177
 178         args[2] = buf.buf;
 179
 180         if (run_command(&rsync))
 181                 die ("Could not run rsync to get refs");
 182
 183         /* read the copied refs */
 184
 185         strbuf_addstr(&temp_dir, "/refs");
 186         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 187         strbuf_setlen(&temp_dir, temp_dir_len);
 188
 189         tail = &dummy;
 190         strbuf_addstr(&temp_dir, "/packed-refs");
 191         insert_packed_refs(temp_dir.buf, &tail);
 192         strbuf_setlen(&temp_dir, temp_dir_len);
 193
 194         if (remove_dir_recursively(&temp_dir, 0))
 195                 warning ("Error removing temporary directory %s.",
 196                                 temp_dir.buf);
 197
 198         strbuf_release(&buf);
 199         strbuf_release(&temp_dir);
 200
 201         return dummy.next;
 202 }
 203
 204 static int fetch_objs_via_rsync(struct transport *transport,
 205                                 int nr_objs, const struct ref **to_fetch)
 206 {
 207         struct strbuf buf = STRBUF_INIT;
 208         struct child_process rsync;
 209         const char *args[8];
 210         int result;
 211
 212         strbuf_addstr(&buf, transport->url);
 213         strbuf_addstr(&buf, "/objects/");
 214
 215         memset(&rsync, 0, sizeof(rsync));
 216         rsync.argv = args;
 217         rsync.stdout_to_stderr = 1;
 218         args[0] = "rsync";
 219         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 220         args[2] = "--ignore-existing";
 221         args[3] = "--exclude";
 222         args[4] = "info";
 223         args[5] = buf.buf;
 224         args[6] = get_object_directory();
 225         args[7] = NULL;
 226
 227         /* NEEDSWORK: handle one level of alternates */
 228         result = run_command(&rsync);
 229
 230         strbuf_release(&buf);
 231
 232         return result;
 233 }
 234
 235 static int write_one_ref(const char *name, const unsigned char *sha1,
 236                 int flags, void *data)
 237 {
 238         struct strbuf *buf = data;
 239         int len = buf->len;
 240         FILE *f;
 241
 242         /* when called via for_each_ref(), flags is non-zero */
 243         if (flags && prefixcmp(name, "refs/heads/") &&
 244                         prefixcmp(name, "refs/tags/"))
 245                 return 0;
 246
 247         strbuf_addstr(buf, name);
 248         if (safe_create_leading_directories(buf->buf) ||
 249                         !(f = fopen(buf->buf, "w")) ||
 250                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 251                         fclose(f))
 252                 return error("problems writing temporary file %s", buf->buf);
 253         strbuf_setlen(buf, len);
 254         return 0;
 255 }
 256
 257 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 258                 int refspec_nr, const char **refspec)
 259 {
 260         int i;
 261
 262         for (i = 0; i < refspec_nr; i++) {
 263                 unsigned char sha1[20];
 264                 char *ref;
 265
 266                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 267                         return error("Could not get ref %s", refspec[i]);
 268
 269                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 270                         free(ref);
 271                         return -1;
 272                 }
 273                 free(ref);
 274         }
 275         return 0;
 276 }
 277
 278 static int rsync_transport_push(struct transport *transport,
 279                 int refspec_nr, const char **refspec, int flags)
 280 {
 281         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 282         int result = 0, i;
 283         struct child_process rsync;
 284         const char *args[10];
 285
 286         if (flags & TRANSPORT_PUSH_MIRROR)
 287                 return error("rsync transport does not support mirror mode");
 288
 289         /* first push the objects */
 290
 291         strbuf_addstr(&buf, transport->url);
 292         strbuf_addch(&buf, '/');
 293
 294         memset(&rsync, 0, sizeof(rsync));
 295         rsync.argv = args;
 296         rsync.stdout_to_stderr = 1;
 297         i = 0;
 298         args[i++] = "rsync";
 299         args[i++] = "-a";
 300         if (flags & TRANSPORT_PUSH_DRY_RUN)
 301                 args[i++] = "--dry-run";
 302         if (transport->verbose > 0)
 303                 args[i++] = "-v";
 304         args[i++] = "--ignore-existing";
 305         args[i++] = "--exclude";
 306         args[i++] = "info";
 307         args[i++] = get_object_directory();
 308         args[i++] = buf.buf;
 309         args[i++] = NULL;
 310
 311         if (run_command(&rsync))
 312                 return error("Could not push objects to %s", transport->url);
 313
 314         /* copy the refs to the temporary directory; they could be packed. */
 315
 316         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 317         if (!mkdtemp(temp_dir.buf))
 318                 die ("Could not make temporary directory");
 319         strbuf_addch(&temp_dir, '/');
 320
 321         if (flags & TRANSPORT_PUSH_ALL) {
 322                 if (for_each_ref(write_one_ref, &temp_dir))
 323                         return -1;
 324         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 325                 return -1;
 326
 327         i = 2;
 328         if (flags & TRANSPORT_PUSH_DRY_RUN)
 329                 args[i++] = "--dry-run";
 330         if (!(flags & TRANSPORT_PUSH_FORCE))
 331                 args[i++] = "--ignore-existing";
 332         args[i++] = temp_dir.buf;
 333         args[i++] = transport->url;
 334         args[i++] = NULL;
 335         if (run_command(&rsync))
 336                 result = error("Could not push to %s", transport->url);
 337
 338         if (remove_dir_recursively(&temp_dir, 0))
 339                 warning ("Could not remove temporary directory %s.",
 340                                 temp_dir.buf);
 341
 342         strbuf_release(&buf);
 343         strbuf_release(&temp_dir);
 344
 345         return result;
 346 }
 347
 348 /* Generic functions for using commit walkers */
 349
 350 #ifndef NO_CURL /* http fetch is the only user */
 351 static int fetch_objs_via_walker(struct transport *transport,
 352                                  int nr_objs, const struct ref **to_fetch)
 353 {
 354         char *dest = xstrdup(transport->url);
 355         struct walker *walker = transport->data;
 356         char **objs = xmalloc(nr_objs * sizeof(*objs));
 357         int i;
 358
 359         walker->get_all = 1;
 360         walker->get_tree = 1;
 361         walker->get_history = 1;
 362         walker->get_verbosely = transport->verbose >= 0;
 363         walker->get_recover = 0;
 364
 365         for (i = 0; i < nr_objs; i++)
 366                 objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 367
 368         if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 369                 die("Fetch failed.");
 370
 371         for (i = 0; i < nr_objs; i++)
 372                 free(objs[i]);
 373         free(objs);
 374         free(dest);
 375         return 0;
 376 }
 377 #endif /* NO_CURL */
 378
 379 static int disconnect_walker(struct transport *transport)
 380 {
 381         struct walker *walker = transport->data;
 382         if (walker)
 383                 walker_free(walker);
 384         return 0;
 385 }
 386
 387 #ifndef NO_CURL
 388 static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 389 {
 390         const char **argv;
 391         int argc;
 392         int err;
 393
 394         if (flags & TRANSPORT_PUSH_MIRROR)
 395                 return error("http transport does not support mirror mode");
 396
 397         argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 398         argv[0] = "http-push";
 399         argc = 1;
 400         if (flags & TRANSPORT_PUSH_ALL)
 401                 argv[argc++] = "--all";
 402         if (flags & TRANSPORT_PUSH_FORCE)
 403                 argv[argc++] = "--force";
 404         if (flags & TRANSPORT_PUSH_DRY_RUN)
 405                 argv[argc++] = "--dry-run";
 406         if (flags & TRANSPORT_PUSH_VERBOSE)
 407                 argv[argc++] = "--verbose";
 408         argv[argc++] = transport->url;
 409         while (refspec_nr--)
 410                 argv[argc++] = *refspec++;
 411         argv[argc] = NULL;
 412         err = run_command_v_opt(argv, RUN_GIT_CMD);
 413         switch (err) {
 414         case -ERR_RUN_COMMAND_FORK:
 415                 error("unable to fork for %s", argv[0]);
 416         case -ERR_RUN_COMMAND_EXEC:
 417                 error("unable to exec %s", argv[0]);
 418                 break;
 419         case -ERR_RUN_COMMAND_WAITPID:
 420         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 421         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 422         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 423                 error("%s died with strange error", argv[0]);
 424         }
 425         return !!err;
 426 }
 427
 428 static struct ref *get_refs_via_curl(struct transport *transport, int for_push)
 429 {
 430         struct strbuf buffer = STRBUF_INIT;
 431         char *data, *start, *mid;
 432         char *ref_name;
 433         char *refs_url;
 434         int i = 0;
 435
 436         struct active_request_slot *slot;
 437         struct slot_results results;
 438
 439         struct ref *refs = NULL;
 440         struct ref *ref = NULL;
 441         struct ref *last_ref = NULL;
 442
 443         struct walker *walker;
 444
 445         if (for_push)
 446                 return NULL;
 447
 448         if (!transport->data)
 449                 transport->data = get_http_walker(transport->url,
 450                                                 transport->remote);
 451
 452         walker = transport->data;
 453
 454         refs_url = xmalloc(strlen(transport->url) + 11);
 455         sprintf(refs_url, "%s/info/refs", transport->url);
 456
 457         slot = get_active_slot();
 458         slot->results = &results;
 459         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 460         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 461         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 462         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 463
 464         if (start_active_slot(slot)) {
 465                 run_active_slot(slot);
 466                 if (results.curl_result != CURLE_OK) {
 467                         strbuf_release(&buffer);
 468                         if (missing_target(&results))
 469                                 die("%s not found: did you run git update-server-info on the server?", refs_url);
 470                         else
 471                                 die("%s download error - %s", refs_url, curl_errorstr);
 472                 }
 473         } else {
 474                 strbuf_release(&buffer);
 475                 die("Unable to start HTTP request");
 476         }
 477
 478         data = buffer.buf;
 479         start = NULL;
 480         mid = data;
 481         while (i < buffer.len) {
 482                 if (!start)
 483                         start = &data[i];
 484                 if (data[i] == '\t')
 485                         mid = &data[i];
 486                 if (data[i] == '\n') {
 487                         data[i] = 0;
 488                         ref_name = mid + 1;
 489                         ref = xmalloc(sizeof(struct ref) +
 490                                       strlen(ref_name) + 1);
 491                         memset(ref, 0, sizeof(struct ref));
 492                         strcpy(ref->name, ref_name);
 493                         get_sha1_hex(start, ref->old_sha1);
 494                         if (!refs)
 495                                 refs = ref;
 496                         if (last_ref)
 497                                 last_ref->next = ref;
 498                         last_ref = ref;
 499                         start = NULL;
 500                 }
 501                 i++;
 502         }
 503
 504         strbuf_release(&buffer);
 505
 506         ref = alloc_ref("HEAD");
 507         if (!walker->fetch_ref(walker, ref) &&
 508             !resolve_remote_symref(ref, refs)) {
 509                 ref->next = refs;
 510                 refs = ref;
 511         } else {
 512                 free(ref);
 513         }
 514
 515         return refs;
 516 }
 517
 518 static int fetch_objs_via_curl(struct transport *transport,
 519                                  int nr_objs, const struct ref **to_fetch)
 520 {
 521         if (!transport->data)
 522                 transport->data = get_http_walker(transport->url,
 523                                                 transport->remote);
 524         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 525 }
 526
 527 #endif
 528
 529 struct bundle_transport_data {
 530         int fd;
 531         struct bundle_header header;
 532 };
 533
 534 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 535 {
 536         struct bundle_transport_data *data = transport->data;
 537         struct ref *result = NULL;
 538         int i;
 539
 540         if (for_push)
 541                 return NULL;
 542
 543         if (data->fd > 0)
 544                 close(data->fd);
 545         data->fd = read_bundle_header(transport->url, &data->header);
 546         if (data->fd < 0)
 547                 die ("Could not read bundle '%s'.", transport->url);
 548         for (i = 0; i < data->header.references.nr; i++) {
 549                 struct ref_list_entry *e = data->header.references.list + i;
 550                 struct ref *ref = alloc_ref(e->name);
 551                 hashcpy(ref->old_sha1, e->sha1);
 552                 ref->next = result;
 553                 result = ref;
 554         }
 555         return result;
 556 }
 557
 558 static int fetch_refs_from_bundle(struct transport *transport,
 559                                int nr_heads, const struct ref **to_fetch)
 560 {
 561         struct bundle_transport_data *data = transport->data;
 562         return unbundle(&data->header, data->fd);
 563 }
 564
 565 static int close_bundle(struct transport *transport)
 566 {
 567         struct bundle_transport_data *data = transport->data;
 568         if (data->fd > 0)
 569                 close(data->fd);
 570         free(data);
 571         return 0;
 572 }
 573
 574 struct git_transport_data {
 575         unsigned thin : 1;
 576         unsigned keep : 1;
 577         unsigned followtags : 1;
 578         int depth;
 579         struct child_process *conn;
 580         int fd[2];
 581         const char *uploadpack;
 582         const char *receivepack;
 583         struct extra_have_objects extra_have;
 584 };
 585
 586 static int set_git_option(struct transport *connection,
 587                           const char *name, const char *value)
 588 {
 589         struct git_transport_data *data = connection->data;
 590         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 591                 data->uploadpack = value;
 592                 return 0;
 593         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 594                 data->receivepack = value;
 595                 return 0;
 596         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 597                 data->thin = !!value;
 598                 return 0;
 599         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 600                 data->followtags = !!value;
 601                 return 0;
 602         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 603                 data->keep = !!value;
 604                 return 0;
 605         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 606                 if (!value)
 607                         data->depth = 0;
 608                 else
 609                         data->depth = atoi(value);
 610                 return 0;
 611         }
 612         return 1;
 613 }
 614
 615 static int connect_setup(struct transport *transport, int for_push, int verbose)
 616 {
 617         struct git_transport_data *data = transport->data;
 618         data->conn = git_connect(data->fd, transport->url,
 619                                  for_push ? data->receivepack : data->uploadpack,
 620                                  verbose ? CONNECT_VERBOSE : 0);
 621         return 0;
 622 }
 623
 624 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 625 {
 626         struct git_transport_data *data = transport->data;
 627         struct ref *refs;
 628
 629         connect_setup(transport, for_push, 0);
 630         get_remote_heads(data->fd[0], &refs, 0, NULL,
 631                          for_push ? REF_NORMAL : 0, &data->extra_have);
 632
 633         return refs;
 634 }
 635
 636 static int fetch_refs_via_pack(struct transport *transport,
 637                                int nr_heads, const struct ref **to_fetch)
 638 {
 639         struct git_transport_data *data = transport->data;
 640         char **heads = xmalloc(nr_heads * sizeof(*heads));
 641         char **origh = xmalloc(nr_heads * sizeof(*origh));
 642         const struct ref *refs;
 643         char *dest = xstrdup(transport->url);
 644         struct fetch_pack_args args;
 645         int i;
 646         struct ref *refs_tmp = NULL;
 647
 648         memset(&args, 0, sizeof(args));
 649         args.uploadpack = data->uploadpack;
 650         args.keep_pack = data->keep;
 651         args.lock_pack = 1;
 652         args.use_thin_pack = data->thin;
 653         args.include_tag = data->followtags;
 654         args.verbose = (transport->verbose > 0);
 655         args.quiet = (transport->verbose < 0);
 656         args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 657         args.depth = data->depth;
 658
 659         for (i = 0; i < nr_heads; i++)
 660                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 661
 662         if (!data->conn) {
 663                 connect_setup(transport, 0, 0);
 664                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 665         }
 666
 667         refs = fetch_pack(&args, data->fd, data->conn,
 668                           refs_tmp ? refs_tmp : transport->remote_refs,
 669                           dest, nr_heads, heads, &transport->pack_lockfile);
 670         close(data->fd[0]);
 671         close(data->fd[1]);
 672         if (finish_connect(data->conn))
 673                 refs = NULL;
 674         data->conn = NULL;
 675
 676         free_refs(refs_tmp);
 677
 678         for (i = 0; i < nr_heads; i++)
 679                 free(origh[i]);
 680         free(origh);
 681         free(heads);
 682         free(dest);
 683         return (refs ? 0 : -1);
 684 }
 685
 686 static int refs_pushed(struct ref *ref)
 687 {
 688         for (; ref; ref = ref->next) {
 689                 switch(ref->status) {
 690                 case REF_STATUS_NONE:
 691                 case REF_STATUS_UPTODATE:
 692                         break;
 693                 default:
 694                         return 1;
 695                 }
 696         }
 697         return 0;
 698 }
 699
 700 static void update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 701 {
 702         struct refspec rs;
 703
 704         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 705                 return;
 706
 707         rs.src = ref->name;
 708         rs.dst = NULL;
 709
 710         if (!remote_find_tracking(remote, &rs)) {
 711                 if (verbose)
 712                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 713                 if (ref->deletion) {
 714                         delete_ref(rs.dst, NULL, 0);
 715                 } else
 716                         update_ref("update by push", rs.dst,
 717                                         ref->new_sha1, NULL, 0, 0);
 718                 free(rs.dst);
 719         }
 720 }
 721
 722 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 723
 724 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 725 {
 726         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 727         if (from)
 728                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 729         else
 730                 fputs(prettify_ref(to), stderr);
 731         if (msg) {
 732                 fputs(" (", stderr);
 733                 fputs(msg, stderr);
 734                 fputc(')', stderr);
 735         }
 736         fputc('\n', stderr);
 737 }
 738
 739 static const char *status_abbrev(unsigned char sha1[20])
 740 {
 741         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 742 }
 743
 744 static void print_ok_ref_status(struct ref *ref)
 745 {
 746         if (ref->deletion)
 747                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 748         else if (is_null_sha1(ref->old_sha1))
 749                 print_ref_status('*',
 750                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 751                           "[new branch]"),
 752                         ref, ref->peer_ref, NULL);
 753         else {
 754                 char quickref[84];
 755                 char type;
 756                 const char *msg;
 757
 758                 strcpy(quickref, status_abbrev(ref->old_sha1));
 759                 if (ref->nonfastforward) {
 760                         strcat(quickref, "...");
 761                         type = '+';
 762                         msg = "forced update";
 763                 } else {
 764                         strcat(quickref, "..");
 765                         type = ' ';
 766                         msg = NULL;
 767                 }
 768                 strcat(quickref, status_abbrev(ref->new_sha1));
 769
 770                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 771         }
 772 }
 773
 774 static int print_one_push_status(struct ref *ref, const char *dest, int count)
 775 {
 776         if (!count)
 777                 fprintf(stderr, "To %s\n", dest);
 778
 779         switch(ref->status) {
 780         case REF_STATUS_NONE:
 781                 print_ref_status('X', "[no match]", ref, NULL, NULL);
 782                 break;
 783         case REF_STATUS_REJECT_NODELETE:
 784                 print_ref_status('!', "[rejected]", ref, NULL,
 785                                 "remote does not support deleting refs");
 786                 break;
 787         case REF_STATUS_UPTODATE:
 788                 print_ref_status('=', "[up to date]", ref,
 789                                 ref->peer_ref, NULL);
 790                 break;
 791         case REF_STATUS_REJECT_NONFASTFORWARD:
 792                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 793                                 "non-fast forward");
 794                 break;
 795         case REF_STATUS_REMOTE_REJECT:
 796                 print_ref_status('!', "[remote rejected]", ref,
 797                                 ref->deletion ? NULL : ref->peer_ref,
 798                                 ref->remote_status);
 799                 break;
 800         case REF_STATUS_EXPECTING_REPORT:
 801                 print_ref_status('!', "[remote failure]", ref,
 802                                 ref->deletion ? NULL : ref->peer_ref,
 803                                 "remote failed to report status");
 804                 break;
 805         case REF_STATUS_OK:
 806                 print_ok_ref_status(ref);
 807                 break;
 808         }
 809
 810         return 1;
 811 }
 812
 813 static void print_push_status(const char *dest, struct ref *refs, int verbose)
 814 {
 815         struct ref *ref;
 816         int n = 0;
 817
 818         if (verbose) {
 819                 for (ref = refs; ref; ref = ref->next)
 820                         if (ref->status == REF_STATUS_UPTODATE)
 821                                 n += print_one_push_status(ref, dest, n);
 822         }
 823
 824         for (ref = refs; ref; ref = ref->next)
 825                 if (ref->status == REF_STATUS_OK)
 826                         n += print_one_push_status(ref, dest, n);
 827
 828         for (ref = refs; ref; ref = ref->next) {
 829                 if (ref->status != REF_STATUS_NONE &&
 830                     ref->status != REF_STATUS_UPTODATE &&
 831                     ref->status != REF_STATUS_OK)
 832                         n += print_one_push_status(ref, dest, n);
 833         }
 834 }
 835
 836 static void verify_remote_names(int nr_heads, const char **heads)
 837 {
 838         int i;
 839
 840         for (i = 0; i < nr_heads; i++) {
 841                 const char *local = heads[i];
 842                 const char *remote = strrchr(heads[i], ':');
 843
 844                 if (*local == '+')
 845                         local++;
 846
 847                 /* A matching refspec is okay.  */
 848                 if (remote == local && remote[1] == '\0')
 849                         continue;
 850
 851                 remote = remote ? (remote + 1) : local;
 852                 switch (check_ref_format(remote)) {
 853                 case 0: /* ok */
 854                 case CHECK_REF_FORMAT_ONELEVEL:
 855                         /* ok but a single level -- that is fine for
 856                          * a match pattern.
 857                          */
 858                 case CHECK_REF_FORMAT_WILDCARD:
 859                         /* ok but ends with a pattern-match character */
 860                         continue;
 861                 }
 862                 die("remote part of refspec is not a valid name in %s",
 863                     heads[i]);
 864         }
 865 }
 866
 867 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 868 {
 869         struct git_transport_data *data = transport->data;
 870         struct send_pack_args args;
 871         int ret;
 872
 873         if (!data->conn) {
 874                 struct ref *tmp_refs;
 875                 connect_setup(transport, 1, 0);
 876
 877                 get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 878                                  NULL);
 879         }
 880
 881         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 882         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 883         args.use_thin_pack = data->thin;
 884         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 885         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 886
 887         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 888                         &data->extra_have);
 889
 890         close(data->fd[1]);
 891         close(data->fd[0]);
 892         ret |= finish_connect(data->conn);
 893         data->conn = NULL;
 894
 895         return ret;
 896 }
 897
 898 static int disconnect_git(struct transport *transport)
 899 {
 900         struct git_transport_data *data = transport->data;
 901         if (data->conn) {
 902                 packet_flush(data->fd[1]);
 903                 close(data->fd[0]);
 904                 close(data->fd[1]);
 905                 finish_connect(data->conn);
 906         }
 907
 908         free(data);
 909         return 0;
 910 }
 911
 912 static int is_local(const char *url)
 913 {
 914         const char *colon = strchr(url, ':');
 915         const char *slash = strchr(url, '/');
 916         return !colon || (slash && slash < colon) ||
 917                 has_dos_drive_prefix(url);
 918 }
 919
 920 static int is_file(const char *url)
 921 {
 922         struct stat buf;
 923         if (stat(url, &buf))
 924                 return 0;
 925         return S_ISREG(buf.st_mode);
 926 }
 927
 928 struct transport *transport_get(struct remote *remote, const char *url)
 929 {
 930         struct transport *ret = xcalloc(1, sizeof(*ret));
 931
 932         ret->remote = remote;
 933         ret->url = url;
 934
 935         if (!prefixcmp(url, "rsync://")) {
 936                 ret->get_refs_list = get_refs_via_rsync;
 937                 ret->fetch = fetch_objs_via_rsync;
 938                 ret->push = rsync_transport_push;
 939
 940         } else if (!prefixcmp(url, "http://")
 941                 || !prefixcmp(url, "https://")
 942                 || !prefixcmp(url, "ftp://")) {
 943 #ifdef NO_CURL
 944                 error("git was compiled without libcurl support.");
 945 #else
 946                 ret->get_refs_list = get_refs_via_curl;
 947                 ret->fetch = fetch_objs_via_curl;
 948                 ret->push = curl_transport_push;
 949 #endif
 950                 ret->disconnect = disconnect_walker;
 951
 952         } else if (is_local(url) && is_file(url)) {
 953                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 954                 ret->data = data;
 955                 ret->get_refs_list = get_refs_from_bundle;
 956                 ret->fetch = fetch_refs_from_bundle;
 957                 ret->disconnect = close_bundle;
 958
 959         } else {
 960                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 961                 ret->data = data;
 962                 ret->set_option = set_git_option;
 963                 ret->get_refs_list = get_refs_via_connect;
 964                 ret->fetch = fetch_refs_via_pack;
 965                 ret->push_refs = git_transport_push;
 966                 ret->disconnect = disconnect_git;
 967
 968                 data->thin = 1;
 969                 data->conn = NULL;
 970                 data->uploadpack = "git-upload-pack";
 971                 if (remote && remote->uploadpack)
 972                         data->uploadpack = remote->uploadpack;
 973                 data->receivepack = "git-receive-pack";
 974                 if (remote && remote->receivepack)
 975                         data->receivepack = remote->receivepack;
 976         }
 977
 978         return ret;
 979 }
 980
 981 int transport_set_option(struct transport *transport,
 982                          const char *name, const char *value)
 983 {
 984         if (transport->set_option)
 985                 return transport->set_option(transport, name, value);
 986         return 1;
 987 }
 988
 989 int transport_push(struct transport *transport,
 990                    int refspec_nr, const char **refspec, int flags)
 991 {
 992         verify_remote_names(refspec_nr, refspec);
 993
 994         if (transport->push)
 995                 return transport->push(transport, refspec_nr, refspec, flags);
 996         if (transport->push_refs) {
 997                 struct ref *remote_refs =
 998                         transport->get_refs_list(transport, 1);
 999                 struct ref **remote_tail;
1000                 struct ref *local_refs = get_local_heads();
1001                 int match_flags = MATCH_REFS_NONE;
1002                 int verbose = flags & TRANSPORT_PUSH_VERBOSE;
1003                 int ret;
1004
1005                 if (flags & TRANSPORT_PUSH_ALL)
1006                         match_flags |= MATCH_REFS_ALL;
1007                 if (flags & TRANSPORT_PUSH_MIRROR)
1008                         match_flags |= MATCH_REFS_MIRROR;
1009
1010                 remote_tail = &remote_refs;
1011                 while (*remote_tail)
1012                         remote_tail = &((*remote_tail)->next);
1013                 if (match_refs(local_refs, remote_refs, &remote_tail,
1014                                refspec_nr, refspec, match_flags)) {
1015                         return -1;
1016                 }
1017
1018                 ret = transport->push_refs(transport, remote_refs, flags);
1019
1020                 print_push_status(transport->url, remote_refs, verbose);
1021
1022                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1023                         struct ref *ref;
1024                         for (ref = remote_refs; ref; ref = ref->next)
1025                                 update_tracking_ref(transport->remote, ref, verbose);
1026                 }
1027
1028                 if (!ret && !refs_pushed(remote_refs))
1029                         fprintf(stderr, "Everything up-to-date\n");
1030                 return ret;
1031         }
1032         return 1;
1033 }
1034
1035 const struct ref *transport_get_remote_refs(struct transport *transport)
1036 {
1037         if (!transport->remote_refs)
1038                 transport->remote_refs = transport->get_refs_list(transport, 0);
1039         return transport->remote_refs;
1040 }
1041
1042 int transport_fetch_refs(struct transport *transport, const struct ref *refs)
1043 {
1044         int rc;
1045         int nr_heads = 0, nr_alloc = 0;
1046         const struct ref **heads = NULL;
1047         const struct ref *rm;
1048
1049         for (rm = refs; rm; rm = rm->next) {
1050                 if (rm->peer_ref &&
1051                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1052                         continue;
1053                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1054                 heads[nr_heads++] = rm;
1055         }
1056
1057         rc = transport->fetch(transport, nr_heads, heads);
1058         free(heads);
1059         return rc;
1060 }
1061
1062 void transport_unlock_pack(struct transport *transport)
1063 {
1064         if (transport->pack_lockfile) {
1065                 unlink(transport->pack_lockfile);
1066                 free(transport->pack_lockfile);
1067                 transport->pack_lockfile = NULL;
1068         }
1069 }
1070
1071 int transport_disconnect(struct transport *transport)
1072 {
1073         int ret = 0;
1074         if (transport->disconnect)
1075                 ret = transport->disconnect(transport);
1076         free(transport);
1077         return ret;
1078 }