git.oblomov.eu Git - git/blob - transport.c

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "run-command.h"
   4 #ifndef NO_CURL
   5 #include "http.h"
   6 #endif
   7 #include "pkt-line.h"
   8 #include "fetch-pack.h"
   9 #include "send-pack.h"
  10 #include "walker.h"
  11 #include "bundle.h"
  12 #include "dir.h"
  13 #include "refs.h"
  14
  15 /* rsync support */
  16
  17 /*
  18  * We copy packed-refs and refs/ into a temporary file, then read the
  19  * loose refs recursively (sorting whenever possible), and then inserting
  20  * those packed refs that are not yet in the list (not validating, but
  21  * assuming that the file is sorted).
  22  *
  23  * Appears refactoring this from refs.c is too cumbersome.
  24  */
  25
  26 static int str_cmp(const void *a, const void *b)
  27 {
  28         const char *s1 = a;
  29         const char *s2 = b;
  30
  31         return strcmp(s1, s2);
  32 }
  33
  34 /* path->buf + name_offset is expected to point to "refs/" */
  35
  36 static int read_loose_refs(struct strbuf *path, int name_offset,
  37                 struct ref **tail)
  38 {
  39         DIR *dir = opendir(path->buf);
  40         struct dirent *de;
  41         struct {
  42                 char **entries;
  43                 int nr, alloc;
  44         } list;
  45         int i, pathlen;
  46
  47         if (!dir)
  48                 return -1;
  49
  50         memset (&list, 0, sizeof(list));
  51
  52         while ((de = readdir(dir))) {
  53                 if (is_dot_or_dotdot(de->d_name))
  54                         continue;
  55                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  56                 list.entries[list.nr++] = xstrdup(de->d_name);
  57         }
  58         closedir(dir);
  59
  60         /* sort the list */
  61
  62         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  63
  64         pathlen = path->len;
  65         strbuf_addch(path, '/');
  66
  67         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  68                 strbuf_addstr(path, list.entries[i]);
  69                 if (read_loose_refs(path, name_offset, tail)) {
  70                         int fd = open(path->buf, O_RDONLY);
  71                         char buffer[40];
  72                         struct ref *next;
  73
  74                         if (fd < 0)
  75                                 continue;
  76                         next = alloc_ref(path->buf + name_offset);
  77                         if (read_in_full(fd, buffer, 40) != 40 ||
  78                                         get_sha1_hex(buffer, next->old_sha1)) {
  79                                 close(fd);
  80                                 free(next);
  81                                 continue;
  82                         }
  83                         close(fd);
  84                         (*tail)->next = next;
  85                         *tail = next;
  86                 }
  87         }
  88         strbuf_setlen(path, pathlen);
  89
  90         for (i = 0; i < list.nr; i++)
  91                 free(list.entries[i]);
  92         free(list.entries);
  93
  94         return 0;
  95 }
  96
  97 /* insert the packed refs for which no loose refs were found */
  98
  99 static void insert_packed_refs(const char *packed_refs, struct ref **list)
 100 {
 101         FILE *f = fopen(packed_refs, "r");
 102         static char buffer[PATH_MAX];
 103
 104         if (!f)
 105                 return;
 106
 107         for (;;) {
 108                 int cmp = cmp, len;
 109
 110                 if (!fgets(buffer, sizeof(buffer), f)) {
 111                         fclose(f);
 112                         return;
 113                 }
 114
 115                 if (hexval(buffer[0]) > 0xf)
 116                         continue;
 117                 len = strlen(buffer);
 118                 if (len && buffer[len - 1] == '\n')
 119                         buffer[--len] = '\0';
 120                 if (len < 41)
 121                         continue;
 122                 while ((*list)->next &&
 123                                 (cmp = strcmp(buffer + 41,
 124                                       (*list)->next->name)) > 0)
 125                         list = &(*list)->next;
 126                 if (!(*list)->next || cmp < 0) {
 127                         struct ref *next = alloc_ref(buffer + 41);
 128                         buffer[40] = '\0';
 129                         if (get_sha1_hex(buffer, next->old_sha1)) {
 130                                 warning ("invalid SHA-1: %s", buffer);
 131                                 free(next);
 132                                 continue;
 133                         }
 134                         next->next = (*list)->next;
 135                         (*list)->next = next;
 136                         list = &(*list)->next;
 137                 }
 138         }
 139 }
 140
 141 static 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, int for_push)
 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         if (for_push)
 155                 return NULL;
 156
 157         /* copy the refs to the temporary directory */
 158
 159         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 160         if (!mkdtemp(temp_dir.buf))
 161                 die ("Could not make temporary directory");
 162         temp_dir_len = temp_dir.len;
 163
 164         strbuf_addstr(&buf, rsync_url(transport->url));
 165         strbuf_addstr(&buf, "/refs");
 166
 167         memset(&rsync, 0, sizeof(rsync));
 168         rsync.argv = args;
 169         rsync.stdout_to_stderr = 1;
 170         args[0] = "rsync";
 171         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 172         args[2] = buf.buf;
 173         args[3] = temp_dir.buf;
 174         args[4] = NULL;
 175
 176         if (run_command(&rsync))
 177                 die ("Could not run rsync to get refs");
 178
 179         strbuf_reset(&buf);
 180         strbuf_addstr(&buf, rsync_url(transport->url));
 181         strbuf_addstr(&buf, "/packed-refs");
 182
 183         args[2] = buf.buf;
 184
 185         if (run_command(&rsync))
 186                 die ("Could not run rsync to get refs");
 187
 188         /* read the copied refs */
 189
 190         strbuf_addstr(&temp_dir, "/refs");
 191         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 192         strbuf_setlen(&temp_dir, temp_dir_len);
 193
 194         tail = &dummy;
 195         strbuf_addstr(&temp_dir, "/packed-refs");
 196         insert_packed_refs(temp_dir.buf, &tail);
 197         strbuf_setlen(&temp_dir, temp_dir_len);
 198
 199         if (remove_dir_recursively(&temp_dir, 0))
 200                 warning ("Error removing temporary directory %s.",
 201                                 temp_dir.buf);
 202
 203         strbuf_release(&buf);
 204         strbuf_release(&temp_dir);
 205
 206         return dummy.next;
 207 }
 208
 209 static int fetch_objs_via_rsync(struct transport *transport,
 210                                 int nr_objs, const struct ref **to_fetch)
 211 {
 212         struct strbuf buf = STRBUF_INIT;
 213         struct child_process rsync;
 214         const char *args[8];
 215         int result;
 216
 217         strbuf_addstr(&buf, rsync_url(transport->url));
 218         strbuf_addstr(&buf, "/objects/");
 219
 220         memset(&rsync, 0, sizeof(rsync));
 221         rsync.argv = args;
 222         rsync.stdout_to_stderr = 1;
 223         args[0] = "rsync";
 224         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 225         args[2] = "--ignore-existing";
 226         args[3] = "--exclude";
 227         args[4] = "info";
 228         args[5] = buf.buf;
 229         args[6] = get_object_directory();
 230         args[7] = NULL;
 231
 232         /* NEEDSWORK: handle one level of alternates */
 233         result = run_command(&rsync);
 234
 235         strbuf_release(&buf);
 236
 237         return result;
 238 }
 239
 240 static int write_one_ref(const char *name, const unsigned char *sha1,
 241                 int flags, void *data)
 242 {
 243         struct strbuf *buf = data;
 244         int len = buf->len;
 245         FILE *f;
 246
 247         /* when called via for_each_ref(), flags is non-zero */
 248         if (flags && prefixcmp(name, "refs/heads/") &&
 249                         prefixcmp(name, "refs/tags/"))
 250                 return 0;
 251
 252         strbuf_addstr(buf, name);
 253         if (safe_create_leading_directories(buf->buf) ||
 254                         !(f = fopen(buf->buf, "w")) ||
 255                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 256                         fclose(f))
 257                 return error("problems writing temporary file %s", buf->buf);
 258         strbuf_setlen(buf, len);
 259         return 0;
 260 }
 261
 262 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 263                 int refspec_nr, const char **refspec)
 264 {
 265         int i;
 266
 267         for (i = 0; i < refspec_nr; i++) {
 268                 unsigned char sha1[20];
 269                 char *ref;
 270
 271                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 272                         return error("Could not get ref %s", refspec[i]);
 273
 274                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 275                         free(ref);
 276                         return -1;
 277                 }
 278                 free(ref);
 279         }
 280         return 0;
 281 }
 282
 283 static int rsync_transport_push(struct transport *transport,
 284                 int refspec_nr, const char **refspec, int flags)
 285 {
 286         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 287         int result = 0, i;
 288         struct child_process rsync;
 289         const char *args[10];
 290
 291         if (flags & TRANSPORT_PUSH_MIRROR)
 292                 return error("rsync transport does not support mirror mode");
 293
 294         /* first push the objects */
 295
 296         strbuf_addstr(&buf, rsync_url(transport->url));
 297         strbuf_addch(&buf, '/');
 298
 299         memset(&rsync, 0, sizeof(rsync));
 300         rsync.argv = args;
 301         rsync.stdout_to_stderr = 1;
 302         i = 0;
 303         args[i++] = "rsync";
 304         args[i++] = "-a";
 305         if (flags & TRANSPORT_PUSH_DRY_RUN)
 306                 args[i++] = "--dry-run";
 307         if (transport->verbose > 0)
 308                 args[i++] = "-v";
 309         args[i++] = "--ignore-existing";
 310         args[i++] = "--exclude";
 311         args[i++] = "info";
 312         args[i++] = get_object_directory();
 313         args[i++] = buf.buf;
 314         args[i++] = NULL;
 315
 316         if (run_command(&rsync))
 317                 return error("Could not push objects to %s",
 318                                 rsync_url(transport->url));
 319
 320         /* copy the refs to the temporary directory; they could be packed. */
 321
 322         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 323         if (!mkdtemp(temp_dir.buf))
 324                 die ("Could not make temporary directory");
 325         strbuf_addch(&temp_dir, '/');
 326
 327         if (flags & TRANSPORT_PUSH_ALL) {
 328                 if (for_each_ref(write_one_ref, &temp_dir))
 329                         return -1;
 330         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 331                 return -1;
 332
 333         i = 2;
 334         if (flags & TRANSPORT_PUSH_DRY_RUN)
 335                 args[i++] = "--dry-run";
 336         if (!(flags & TRANSPORT_PUSH_FORCE))
 337                 args[i++] = "--ignore-existing";
 338         args[i++] = temp_dir.buf;
 339         args[i++] = rsync_url(transport->url);
 340         args[i++] = NULL;
 341         if (run_command(&rsync))
 342                 result = error("Could not push to %s",
 343                                 rsync_url(transport->url));
 344
 345         if (remove_dir_recursively(&temp_dir, 0))
 346                 warning ("Could not remove temporary directory %s.",
 347                                 temp_dir.buf);
 348
 349         strbuf_release(&buf);
 350         strbuf_release(&temp_dir);
 351
 352         return result;
 353 }
 354
 355 /* Generic functions for using commit walkers */
 356
 357 #ifndef NO_CURL /* http fetch is the only user */
 358 static int fetch_objs_via_walker(struct transport *transport,
 359                                  int nr_objs, const struct ref **to_fetch)
 360 {
 361         char *dest = xstrdup(transport->url);
 362         struct walker *walker = transport->data;
 363         char **objs = xmalloc(nr_objs * sizeof(*objs));
 364         int i;
 365
 366         walker->get_all = 1;
 367         walker->get_tree = 1;
 368         walker->get_history = 1;
 369         walker->get_verbosely = transport->verbose >= 0;
 370         walker->get_recover = 0;
 371
 372         for (i = 0; i < nr_objs; i++)
 373                 objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 374
 375         if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 376                 die("Fetch failed.");
 377
 378         for (i = 0; i < nr_objs; i++)
 379                 free(objs[i]);
 380         free(objs);
 381         free(dest);
 382         return 0;
 383 }
 384 #endif /* NO_CURL */
 385
 386 static int disconnect_walker(struct transport *transport)
 387 {
 388         struct walker *walker = transport->data;
 389         if (walker)
 390                 walker_free(walker);
 391         return 0;
 392 }
 393
 394 #ifndef NO_CURL
 395 static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 396 {
 397         const char **argv;
 398         int argc;
 399         int err;
 400
 401         if (flags & TRANSPORT_PUSH_MIRROR)
 402                 return error("http transport does not support mirror mode");
 403
 404         argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 405         argv[0] = "http-push";
 406         argc = 1;
 407         if (flags & TRANSPORT_PUSH_ALL)
 408                 argv[argc++] = "--all";
 409         if (flags & TRANSPORT_PUSH_FORCE)
 410                 argv[argc++] = "--force";
 411         if (flags & TRANSPORT_PUSH_DRY_RUN)
 412                 argv[argc++] = "--dry-run";
 413         if (flags & TRANSPORT_PUSH_VERBOSE)
 414                 argv[argc++] = "--verbose";
 415         argv[argc++] = transport->url;
 416         while (refspec_nr--)
 417                 argv[argc++] = *refspec++;
 418         argv[argc] = NULL;
 419         err = run_command_v_opt(argv, RUN_GIT_CMD);
 420         switch (err) {
 421         case -ERR_RUN_COMMAND_FORK:
 422                 error("unable to fork for %s", argv[0]);
 423         case -ERR_RUN_COMMAND_EXEC:
 424                 error("unable to exec %s", argv[0]);
 425                 break;
 426         case -ERR_RUN_COMMAND_WAITPID:
 427         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 428         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 429         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 430                 error("%s died with strange error", argv[0]);
 431         }
 432         return !!err;
 433 }
 434
 435 static struct ref *get_refs_via_curl(struct transport *transport, int for_push)
 436 {
 437         struct strbuf buffer = STRBUF_INIT;
 438         char *data, *start, *mid;
 439         char *ref_name;
 440         char *refs_url;
 441         int i = 0;
 442
 443         struct active_request_slot *slot;
 444         struct slot_results results;
 445
 446         struct ref *refs = NULL;
 447         struct ref *ref = NULL;
 448         struct ref *last_ref = NULL;
 449
 450         struct walker *walker;
 451
 452         if (for_push)
 453                 return NULL;
 454
 455         if (!transport->data)
 456                 transport->data = get_http_walker(transport->url,
 457                                                 transport->remote);
 458
 459         walker = transport->data;
 460
 461         refs_url = xmalloc(strlen(transport->url) + 11);
 462         sprintf(refs_url, "%s/info/refs", transport->url);
 463
 464         slot = get_active_slot();
 465         slot->results = &results;
 466         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 467         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 468         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 469         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 470
 471         if (start_active_slot(slot)) {
 472                 run_active_slot(slot);
 473                 if (results.curl_result != CURLE_OK) {
 474                         strbuf_release(&buffer);
 475                         if (missing_target(&results))
 476                                 die("%s not found: did you run git update-server-info on the server?", refs_url);
 477                         else
 478                                 die("%s download error - %s", refs_url, curl_errorstr);
 479                 }
 480         } else {
 481                 strbuf_release(&buffer);
 482                 die("Unable to start HTTP request");
 483         }
 484
 485         data = buffer.buf;
 486         start = NULL;
 487         mid = data;
 488         while (i < buffer.len) {
 489                 if (!start)
 490                         start = &data[i];
 491                 if (data[i] == '\t')
 492                         mid = &data[i];
 493                 if (data[i] == '\n') {
 494                         data[i] = 0;
 495                         ref_name = mid + 1;
 496                         ref = xmalloc(sizeof(struct ref) +
 497                                       strlen(ref_name) + 1);
 498                         memset(ref, 0, sizeof(struct ref));
 499                         strcpy(ref->name, ref_name);
 500                         get_sha1_hex(start, ref->old_sha1);
 501                         if (!refs)
 502                                 refs = ref;
 503                         if (last_ref)
 504                                 last_ref->next = ref;
 505                         last_ref = ref;
 506                         start = NULL;
 507                 }
 508                 i++;
 509         }
 510
 511         strbuf_release(&buffer);
 512
 513         ref = alloc_ref("HEAD");
 514         if (!walker->fetch_ref(walker, ref) &&
 515             !resolve_remote_symref(ref, refs)) {
 516                 ref->next = refs;
 517                 refs = ref;
 518         } else {
 519                 free(ref);
 520         }
 521
 522         return refs;
 523 }
 524
 525 static int fetch_objs_via_curl(struct transport *transport,
 526                                  int nr_objs, const struct ref **to_fetch)
 527 {
 528         if (!transport->data)
 529                 transport->data = get_http_walker(transport->url,
 530                                                 transport->remote);
 531         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 532 }
 533
 534 #endif
 535
 536 struct bundle_transport_data {
 537         int fd;
 538         struct bundle_header header;
 539 };
 540
 541 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 542 {
 543         struct bundle_transport_data *data = transport->data;
 544         struct ref *result = NULL;
 545         int i;
 546
 547         if (for_push)
 548                 return NULL;
 549
 550         if (data->fd > 0)
 551                 close(data->fd);
 552         data->fd = read_bundle_header(transport->url, &data->header);
 553         if (data->fd < 0)
 554                 die ("Could not read bundle '%s'.", transport->url);
 555         for (i = 0; i < data->header.references.nr; i++) {
 556                 struct ref_list_entry *e = data->header.references.list + i;
 557                 struct ref *ref = alloc_ref(e->name);
 558                 hashcpy(ref->old_sha1, e->sha1);
 559                 ref->next = result;
 560                 result = ref;
 561         }
 562         return result;
 563 }
 564
 565 static int fetch_refs_from_bundle(struct transport *transport,
 566                                int nr_heads, const struct ref **to_fetch)
 567 {
 568         struct bundle_transport_data *data = transport->data;
 569         return unbundle(&data->header, data->fd);
 570 }
 571
 572 static int close_bundle(struct transport *transport)
 573 {
 574         struct bundle_transport_data *data = transport->data;
 575         if (data->fd > 0)
 576                 close(data->fd);
 577         free(data);
 578         return 0;
 579 }
 580
 581 struct git_transport_data {
 582         unsigned thin : 1;
 583         unsigned keep : 1;
 584         unsigned followtags : 1;
 585         int depth;
 586         struct child_process *conn;
 587         int fd[2];
 588         const char *uploadpack;
 589         const char *receivepack;
 590         struct extra_have_objects extra_have;
 591 };
 592
 593 static int set_git_option(struct transport *connection,
 594                           const char *name, const char *value)
 595 {
 596         struct git_transport_data *data = connection->data;
 597         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 598                 data->uploadpack = value;
 599                 return 0;
 600         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 601                 data->receivepack = value;
 602                 return 0;
 603         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 604                 data->thin = !!value;
 605                 return 0;
 606         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 607                 data->followtags = !!value;
 608                 return 0;
 609         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 610                 data->keep = !!value;
 611                 return 0;
 612         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 613                 if (!value)
 614                         data->depth = 0;
 615                 else
 616                         data->depth = atoi(value);
 617                 return 0;
 618         }
 619         return 1;
 620 }
 621
 622 static int connect_setup(struct transport *transport, int for_push, int verbose)
 623 {
 624         struct git_transport_data *data = transport->data;
 625         data->conn = git_connect(data->fd, transport->url,
 626                                  for_push ? data->receivepack : data->uploadpack,
 627                                  verbose ? CONNECT_VERBOSE : 0);
 628         return 0;
 629 }
 630
 631 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 632 {
 633         struct git_transport_data *data = transport->data;
 634         struct ref *refs;
 635
 636         connect_setup(transport, for_push, 0);
 637         get_remote_heads(data->fd[0], &refs, 0, NULL,
 638                          for_push ? REF_NORMAL : 0, &data->extra_have);
 639
 640         return refs;
 641 }
 642
 643 static int fetch_refs_via_pack(struct transport *transport,
 644                                int nr_heads, const struct ref **to_fetch)
 645 {
 646         struct git_transport_data *data = transport->data;
 647         char **heads = xmalloc(nr_heads * sizeof(*heads));
 648         char **origh = xmalloc(nr_heads * sizeof(*origh));
 649         const struct ref *refs;
 650         char *dest = xstrdup(transport->url);
 651         struct fetch_pack_args args;
 652         int i;
 653         struct ref *refs_tmp = NULL;
 654
 655         memset(&args, 0, sizeof(args));
 656         args.uploadpack = data->uploadpack;
 657         args.keep_pack = data->keep;
 658         args.lock_pack = 1;
 659         args.use_thin_pack = data->thin;
 660         args.include_tag = data->followtags;
 661         args.verbose = (transport->verbose > 0);
 662         args.quiet = (transport->verbose < 0);
 663         args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 664         args.depth = data->depth;
 665
 666         for (i = 0; i < nr_heads; i++)
 667                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 668
 669         if (!data->conn) {
 670                 connect_setup(transport, 0, 0);
 671                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 672         }
 673
 674         refs = fetch_pack(&args, data->fd, data->conn,
 675                           refs_tmp ? refs_tmp : transport->remote_refs,
 676                           dest, nr_heads, heads, &transport->pack_lockfile);
 677         close(data->fd[0]);
 678         close(data->fd[1]);
 679         if (finish_connect(data->conn))
 680                 refs = NULL;
 681         data->conn = NULL;
 682
 683         free_refs(refs_tmp);
 684
 685         for (i = 0; i < nr_heads; i++)
 686                 free(origh[i]);
 687         free(origh);
 688         free(heads);
 689         free(dest);
 690         return (refs ? 0 : -1);
 691 }
 692
 693 static int refs_pushed(struct ref *ref)
 694 {
 695         for (; ref; ref = ref->next) {
 696                 switch(ref->status) {
 697                 case REF_STATUS_NONE:
 698                 case REF_STATUS_UPTODATE:
 699                         break;
 700                 default:
 701                         return 1;
 702                 }
 703         }
 704         return 0;
 705 }
 706
 707 static void update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 708 {
 709         struct refspec rs;
 710
 711         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 712                 return;
 713
 714         rs.src = ref->name;
 715         rs.dst = NULL;
 716
 717         if (!remote_find_tracking(remote, &rs)) {
 718                 if (verbose)
 719                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 720                 if (ref->deletion) {
 721                         delete_ref(rs.dst, NULL, 0);
 722                 } else
 723                         update_ref("update by push", rs.dst,
 724                                         ref->new_sha1, NULL, 0, 0);
 725                 free(rs.dst);
 726         }
 727 }
 728
 729 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 730
 731 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 732 {
 733         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 734         if (from)
 735                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 736         else
 737                 fputs(prettify_ref(to), stderr);
 738         if (msg) {
 739                 fputs(" (", stderr);
 740                 fputs(msg, stderr);
 741                 fputc(')', stderr);
 742         }
 743         fputc('\n', stderr);
 744 }
 745
 746 static const char *status_abbrev(unsigned char sha1[20])
 747 {
 748         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 749 }
 750
 751 static void print_ok_ref_status(struct ref *ref)
 752 {
 753         if (ref->deletion)
 754                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 755         else if (is_null_sha1(ref->old_sha1))
 756                 print_ref_status('*',
 757                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 758                           "[new branch]"),
 759                         ref, ref->peer_ref, NULL);
 760         else {
 761                 char quickref[84];
 762                 char type;
 763                 const char *msg;
 764
 765                 strcpy(quickref, status_abbrev(ref->old_sha1));
 766                 if (ref->nonfastforward) {
 767                         strcat(quickref, "...");
 768                         type = '+';
 769                         msg = "forced update";
 770                 } else {
 771                         strcat(quickref, "..");
 772                         type = ' ';
 773                         msg = NULL;
 774                 }
 775                 strcat(quickref, status_abbrev(ref->new_sha1));
 776
 777                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 778         }
 779 }
 780
 781 static int print_one_push_status(struct ref *ref, const char *dest, int count)
 782 {
 783         if (!count)
 784                 fprintf(stderr, "To %s\n", dest);
 785
 786         switch(ref->status) {
 787         case REF_STATUS_NONE:
 788                 print_ref_status('X', "[no match]", ref, NULL, NULL);
 789                 break;
 790         case REF_STATUS_REJECT_NODELETE:
 791                 print_ref_status('!', "[rejected]", ref, NULL,
 792                                 "remote does not support deleting refs");
 793                 break;
 794         case REF_STATUS_UPTODATE:
 795                 print_ref_status('=', "[up to date]", ref,
 796                                 ref->peer_ref, NULL);
 797                 break;
 798         case REF_STATUS_REJECT_NONFASTFORWARD:
 799                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 800                                 "non-fast forward");
 801                 break;
 802         case REF_STATUS_REMOTE_REJECT:
 803                 print_ref_status('!', "[remote rejected]", ref,
 804                                 ref->deletion ? NULL : ref->peer_ref,
 805                                 ref->remote_status);
 806                 break;
 807         case REF_STATUS_EXPECTING_REPORT:
 808                 print_ref_status('!', "[remote failure]", ref,
 809                                 ref->deletion ? NULL : ref->peer_ref,
 810                                 "remote failed to report status");
 811                 break;
 812         case REF_STATUS_OK:
 813                 print_ok_ref_status(ref);
 814                 break;
 815         }
 816
 817         return 1;
 818 }
 819
 820 static void print_push_status(const char *dest, struct ref *refs, int verbose)
 821 {
 822         struct ref *ref;
 823         int n = 0;
 824
 825         if (verbose) {
 826                 for (ref = refs; ref; ref = ref->next)
 827                         if (ref->status == REF_STATUS_UPTODATE)
 828                                 n += print_one_push_status(ref, dest, n);
 829         }
 830
 831         for (ref = refs; ref; ref = ref->next)
 832                 if (ref->status == REF_STATUS_OK)
 833                         n += print_one_push_status(ref, dest, n);
 834
 835         for (ref = refs; ref; ref = ref->next) {
 836                 if (ref->status != REF_STATUS_NONE &&
 837                     ref->status != REF_STATUS_UPTODATE &&
 838                     ref->status != REF_STATUS_OK)
 839                         n += print_one_push_status(ref, dest, n);
 840         }
 841 }
 842
 843 static void verify_remote_names(int nr_heads, const char **heads)
 844 {
 845         int i;
 846
 847         for (i = 0; i < nr_heads; i++) {
 848                 const char *local = heads[i];
 849                 const char *remote = strrchr(heads[i], ':');
 850
 851                 if (*local == '+')
 852                         local++;
 853
 854                 /* A matching refspec is okay.  */
 855                 if (remote == local && remote[1] == '\0')
 856                         continue;
 857
 858                 remote = remote ? (remote + 1) : local;
 859                 switch (check_ref_format(remote)) {
 860                 case 0: /* ok */
 861                 case CHECK_REF_FORMAT_ONELEVEL:
 862                         /* ok but a single level -- that is fine for
 863                          * a match pattern.
 864                          */
 865                 case CHECK_REF_FORMAT_WILDCARD:
 866                         /* ok but ends with a pattern-match character */
 867                         continue;
 868                 }
 869                 die("remote part of refspec is not a valid name in %s",
 870                     heads[i]);
 871         }
 872 }
 873
 874 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 875 {
 876         struct git_transport_data *data = transport->data;
 877         struct send_pack_args args;
 878         int ret;
 879
 880         if (!data->conn) {
 881                 struct ref *tmp_refs;
 882                 connect_setup(transport, 1, 0);
 883
 884                 get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 885                                  NULL);
 886         }
 887
 888         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 889         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 890         args.use_thin_pack = data->thin;
 891         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 892         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 893
 894         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 895                         &data->extra_have);
 896
 897         close(data->fd[1]);
 898         close(data->fd[0]);
 899         ret |= finish_connect(data->conn);
 900         data->conn = NULL;
 901
 902         return ret;
 903 }
 904
 905 static int disconnect_git(struct transport *transport)
 906 {
 907         struct git_transport_data *data = transport->data;
 908         if (data->conn) {
 909                 packet_flush(data->fd[1]);
 910                 close(data->fd[0]);
 911                 close(data->fd[1]);
 912                 finish_connect(data->conn);
 913         }
 914
 915         free(data);
 916         return 0;
 917 }
 918
 919 static int is_local(const char *url)
 920 {
 921         const char *colon = strchr(url, ':');
 922         const char *slash = strchr(url, '/');
 923         return !colon || (slash && slash < colon) ||
 924                 has_dos_drive_prefix(url);
 925 }
 926
 927 static int is_file(const char *url)
 928 {
 929         struct stat buf;
 930         if (stat(url, &buf))
 931                 return 0;
 932         return S_ISREG(buf.st_mode);
 933 }
 934
 935 struct transport *transport_get(struct remote *remote, const char *url)
 936 {
 937         struct transport *ret = xcalloc(1, sizeof(*ret));
 938
 939         ret->remote = remote;
 940         ret->url = url;
 941
 942         if (!prefixcmp(url, "rsync:")) {
 943                 ret->get_refs_list = get_refs_via_rsync;
 944                 ret->fetch = fetch_objs_via_rsync;
 945                 ret->push = rsync_transport_push;
 946
 947         } else if (!prefixcmp(url, "http://")
 948                 || !prefixcmp(url, "https://")
 949                 || !prefixcmp(url, "ftp://")) {
 950 #ifdef NO_CURL
 951                 error("git was compiled without libcurl support.");
 952 #else
 953                 ret->get_refs_list = get_refs_via_curl;
 954                 ret->fetch = fetch_objs_via_curl;
 955                 ret->push = curl_transport_push;
 956 #endif
 957                 ret->disconnect = disconnect_walker;
 958
 959         } else if (is_local(url) && is_file(url)) {
 960                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 961                 ret->data = data;
 962                 ret->get_refs_list = get_refs_from_bundle;
 963                 ret->fetch = fetch_refs_from_bundle;
 964                 ret->disconnect = close_bundle;
 965
 966         } else {
 967                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 968                 ret->data = data;
 969                 ret->set_option = set_git_option;
 970                 ret->get_refs_list = get_refs_via_connect;
 971                 ret->fetch = fetch_refs_via_pack;
 972                 ret->push_refs = git_transport_push;
 973                 ret->disconnect = disconnect_git;
 974
 975                 data->thin = 1;
 976                 data->conn = NULL;
 977                 data->uploadpack = "git-upload-pack";
 978                 if (remote && remote->uploadpack)
 979                         data->uploadpack = remote->uploadpack;
 980                 data->receivepack = "git-receive-pack";
 981                 if (remote && remote->receivepack)
 982                         data->receivepack = remote->receivepack;
 983         }
 984
 985         return ret;
 986 }
 987
 988 int transport_set_option(struct transport *transport,
 989                          const char *name, const char *value)
 990 {
 991         if (transport->set_option)
 992                 return transport->set_option(transport, name, value);
 993         return 1;
 994 }
 995
 996 int transport_push(struct transport *transport,
 997                    int refspec_nr, const char **refspec, int flags)
 998 {
 999         verify_remote_names(refspec_nr, refspec);
1000
1001         if (transport->push)
1002                 return transport->push(transport, refspec_nr, refspec, flags);
1003         if (transport->push_refs) {
1004                 struct ref *remote_refs =
1005                         transport->get_refs_list(transport, 1);
1006                 struct ref **remote_tail;
1007                 struct ref *local_refs = get_local_heads();
1008                 int match_flags = MATCH_REFS_NONE;
1009                 int verbose = flags & TRANSPORT_PUSH_VERBOSE;
1010                 int ret;
1011
1012                 if (flags & TRANSPORT_PUSH_ALL)
1013                         match_flags |= MATCH_REFS_ALL;
1014                 if (flags & TRANSPORT_PUSH_MIRROR)
1015                         match_flags |= MATCH_REFS_MIRROR;
1016
1017                 remote_tail = &remote_refs;
1018                 while (*remote_tail)
1019                         remote_tail = &((*remote_tail)->next);
1020                 if (match_refs(local_refs, remote_refs, &remote_tail,
1021                                refspec_nr, refspec, match_flags)) {
1022                         return -1;
1023                 }
1024
1025                 ret = transport->push_refs(transport, remote_refs, flags);
1026
1027                 print_push_status(transport->url, remote_refs, verbose);
1028
1029                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1030                         struct ref *ref;
1031                         for (ref = remote_refs; ref; ref = ref->next)
1032                                 update_tracking_ref(transport->remote, ref, verbose);
1033                 }
1034
1035                 if (!ret && !refs_pushed(remote_refs))
1036                         fprintf(stderr, "Everything up-to-date\n");
1037                 return ret;
1038         }
1039         return 1;
1040 }
1041
1042 const struct ref *transport_get_remote_refs(struct transport *transport)
1043 {
1044         if (!transport->remote_refs)
1045                 transport->remote_refs = transport->get_refs_list(transport, 0);
1046         return transport->remote_refs;
1047 }
1048
1049 int transport_fetch_refs(struct transport *transport, const struct ref *refs)
1050 {
1051         int rc;
1052         int nr_heads = 0, nr_alloc = 0;
1053         const struct ref **heads = NULL;
1054         const struct ref *rm;
1055
1056         for (rm = refs; rm; rm = rm->next) {
1057                 if (rm->peer_ref &&
1058                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1059                         continue;
1060                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1061                 heads[nr_heads++] = rm;
1062         }
1063
1064         rc = transport->fetch(transport, nr_heads, heads);
1065         free(heads);
1066         return rc;
1067 }
1068
1069 void transport_unlock_pack(struct transport *transport)
1070 {
1071         if (transport->pack_lockfile) {
1072                 unlink(transport->pack_lockfile);
1073                 free(transport->pack_lockfile);
1074                 transport->pack_lockfile = NULL;
1075         }
1076 }
1077
1078 int transport_disconnect(struct transport *transport)
1079 {
1080         int ret = 0;
1081         if (transport->disconnect)
1082                 ret = transport->disconnect(transport);
1083         free(transport);
1084         return ret;
1085 }