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_errno ("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_errno ("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         int http_ret;
 443
 444         struct ref *refs = NULL;
 445         struct ref *ref = NULL;
 446         struct ref *last_ref = NULL;
 447
 448         struct walker *walker;
 449
 450         if (for_push)
 451                 return NULL;
 452
 453         if (!transport->data)
 454                 transport->data = get_http_walker(transport->url,
 455                                                 transport->remote);
 456
 457         walker = transport->data;
 458
 459         refs_url = xmalloc(strlen(transport->url) + 11);
 460         sprintf(refs_url, "%s/info/refs", transport->url);
 461
 462         http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 463         switch (http_ret) {
 464         case HTTP_OK:
 465                 break;
 466         case HTTP_MISSING_TARGET:
 467                 die("%s not found: did you run git update-server-info on the"
 468                     " server?", refs_url);
 469         default:
 470                 http_error(refs_url, http_ret);
 471                 die("HTTP request failed");
 472         }
 473
 474         data = buffer.buf;
 475         start = NULL;
 476         mid = data;
 477         while (i < buffer.len) {
 478                 if (!start)
 479                         start = &data[i];
 480                 if (data[i] == '\t')
 481                         mid = &data[i];
 482                 if (data[i] == '\n') {
 483                         data[i] = 0;
 484                         ref_name = mid + 1;
 485                         ref = xmalloc(sizeof(struct ref) +
 486                                       strlen(ref_name) + 1);
 487                         memset(ref, 0, sizeof(struct ref));
 488                         strcpy(ref->name, ref_name);
 489                         get_sha1_hex(start, ref->old_sha1);
 490                         if (!refs)
 491                                 refs = ref;
 492                         if (last_ref)
 493                                 last_ref->next = ref;
 494                         last_ref = ref;
 495                         start = NULL;
 496                 }
 497                 i++;
 498         }
 499
 500         strbuf_release(&buffer);
 501
 502         ref = alloc_ref("HEAD");
 503         if (!walker->fetch_ref(walker, ref) &&
 504             !resolve_remote_symref(ref, refs)) {
 505                 ref->next = refs;
 506                 refs = ref;
 507         } else {
 508                 free(ref);
 509         }
 510
 511         strbuf_release(&buffer);
 512         free(refs_url);
 513         return refs;
 514 }
 515
 516 static int fetch_objs_via_curl(struct transport *transport,
 517                                  int nr_objs, const struct ref **to_fetch)
 518 {
 519         if (!transport->data)
 520                 transport->data = get_http_walker(transport->url,
 521                                                 transport->remote);
 522         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 523 }
 524
 525 #endif
 526
 527 struct bundle_transport_data {
 528         int fd;
 529         struct bundle_header header;
 530 };
 531
 532 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 533 {
 534         struct bundle_transport_data *data = transport->data;
 535         struct ref *result = NULL;
 536         int i;
 537
 538         if (for_push)
 539                 return NULL;
 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         struct extra_have_objects extra_have;
 582 };
 583
 584 static int set_git_option(struct transport *connection,
 585                           const char *name, const char *value)
 586 {
 587         struct git_transport_data *data = connection->data;
 588         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 589                 data->uploadpack = value;
 590                 return 0;
 591         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 592                 data->receivepack = value;
 593                 return 0;
 594         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 595                 data->thin = !!value;
 596                 return 0;
 597         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 598                 data->followtags = !!value;
 599                 return 0;
 600         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 601                 data->keep = !!value;
 602                 return 0;
 603         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 604                 if (!value)
 605                         data->depth = 0;
 606                 else
 607                         data->depth = atoi(value);
 608                 return 0;
 609         }
 610         return 1;
 611 }
 612
 613 static int connect_setup(struct transport *transport, int for_push, int verbose)
 614 {
 615         struct git_transport_data *data = transport->data;
 616         data->conn = git_connect(data->fd, transport->url,
 617                                  for_push ? data->receivepack : data->uploadpack,
 618                                  verbose ? CONNECT_VERBOSE : 0);
 619         return 0;
 620 }
 621
 622 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 623 {
 624         struct git_transport_data *data = transport->data;
 625         struct ref *refs;
 626
 627         connect_setup(transport, for_push, 0);
 628         get_remote_heads(data->fd[0], &refs, 0, NULL,
 629                          for_push ? REF_NORMAL : 0, &data->extra_have);
 630
 631         return refs;
 632 }
 633
 634 static int fetch_refs_via_pack(struct transport *transport,
 635                                int nr_heads, const struct ref **to_fetch)
 636 {
 637         struct git_transport_data *data = transport->data;
 638         char **heads = xmalloc(nr_heads * sizeof(*heads));
 639         char **origh = xmalloc(nr_heads * sizeof(*origh));
 640         const struct ref *refs;
 641         char *dest = xstrdup(transport->url);
 642         struct fetch_pack_args args;
 643         int i;
 644         struct ref *refs_tmp = NULL;
 645
 646         memset(&args, 0, sizeof(args));
 647         args.uploadpack = data->uploadpack;
 648         args.keep_pack = data->keep;
 649         args.lock_pack = 1;
 650         args.use_thin_pack = data->thin;
 651         args.include_tag = data->followtags;
 652         args.verbose = (transport->verbose > 0);
 653         args.quiet = (transport->verbose < 0);
 654         args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 655         args.depth = data->depth;
 656
 657         for (i = 0; i < nr_heads; i++)
 658                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 659
 660         if (!data->conn) {
 661                 connect_setup(transport, 0, 0);
 662                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 663         }
 664
 665         refs = fetch_pack(&args, data->fd, data->conn,
 666                           refs_tmp ? refs_tmp : transport->remote_refs,
 667                           dest, nr_heads, heads, &transport->pack_lockfile);
 668         close(data->fd[0]);
 669         close(data->fd[1]);
 670         if (finish_connect(data->conn))
 671                 refs = NULL;
 672         data->conn = NULL;
 673
 674         free_refs(refs_tmp);
 675
 676         for (i = 0; i < nr_heads; i++)
 677                 free(origh[i]);
 678         free(origh);
 679         free(heads);
 680         free(dest);
 681         return (refs ? 0 : -1);
 682 }
 683
 684 static int refs_pushed(struct ref *ref)
 685 {
 686         for (; ref; ref = ref->next) {
 687                 switch(ref->status) {
 688                 case REF_STATUS_NONE:
 689                 case REF_STATUS_UPTODATE:
 690                         break;
 691                 default:
 692                         return 1;
 693                 }
 694         }
 695         return 0;
 696 }
 697
 698 static void update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 699 {
 700         struct refspec rs;
 701
 702         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 703                 return;
 704
 705         rs.src = ref->name;
 706         rs.dst = NULL;
 707
 708         if (!remote_find_tracking(remote, &rs)) {
 709                 if (verbose)
 710                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 711                 if (ref->deletion) {
 712                         delete_ref(rs.dst, NULL, 0);
 713                 } else
 714                         update_ref("update by push", rs.dst,
 715                                         ref->new_sha1, NULL, 0, 0);
 716                 free(rs.dst);
 717         }
 718 }
 719
 720 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 721
 722 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 723 {
 724         if (porcelain) {
 725                 if (from)
 726                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 727                 else
 728                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 729                 if (msg)
 730                         fprintf(stdout, "%s (%s)\n", summary, msg);
 731                 else
 732                         fprintf(stdout, "%s\n", summary);
 733         } else {
 734                 fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 735                 if (from)
 736                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 737                 else
 738                         fputs(prettify_refname(to->name), stderr);
 739                 if (msg) {
 740                         fputs(" (", stderr);
 741                         fputs(msg, stderr);
 742                         fputc(')', stderr);
 743                 }
 744                 fputc('\n', stderr);
 745         }
 746 }
 747
 748 static const char *status_abbrev(unsigned char sha1[20])
 749 {
 750         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 751 }
 752
 753 static void print_ok_ref_status(struct ref *ref, int porcelain)
 754 {
 755         if (ref->deletion)
 756                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 757         else if (is_null_sha1(ref->old_sha1))
 758                 print_ref_status('*',
 759                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 760                         "[new branch]"),
 761                         ref, ref->peer_ref, NULL, porcelain);
 762         else {
 763                 char quickref[84];
 764                 char type;
 765                 const char *msg;
 766
 767                 strcpy(quickref, status_abbrev(ref->old_sha1));
 768                 if (ref->nonfastforward) {
 769                         strcat(quickref, "...");
 770                         type = '+';
 771                         msg = "forced update";
 772                 } else {
 773                         strcat(quickref, "..");
 774                         type = ' ';
 775                         msg = NULL;
 776                 }
 777                 strcat(quickref, status_abbrev(ref->new_sha1));
 778
 779                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 780         }
 781 }
 782
 783 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 784 {
 785         if (!count)
 786                 fprintf(stderr, "To %s\n", dest);
 787
 788         switch(ref->status) {
 789         case REF_STATUS_NONE:
 790                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 791                 break;
 792         case REF_STATUS_REJECT_NODELETE:
 793                 print_ref_status('!', "[rejected]", ref, NULL,
 794                                                  "remote does not support deleting refs", porcelain);
 795                 break;
 796         case REF_STATUS_UPTODATE:
 797                 print_ref_status('=', "[up to date]", ref,
 798                                                  ref->peer_ref, NULL, porcelain);
 799                 break;
 800         case REF_STATUS_REJECT_NONFASTFORWARD:
 801                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 802                                                  "non-fast forward", porcelain);
 803                 break;
 804         case REF_STATUS_REMOTE_REJECT:
 805                 print_ref_status('!', "[remote rejected]", ref,
 806                                                  ref->deletion ? NULL : ref->peer_ref,
 807                                                  ref->remote_status, porcelain);
 808                 break;
 809         case REF_STATUS_EXPECTING_REPORT:
 810                 print_ref_status('!', "[remote failure]", ref,
 811                                                  ref->deletion ? NULL : ref->peer_ref,
 812                                                  "remote failed to report status", porcelain);
 813                 break;
 814         case REF_STATUS_OK:
 815                 print_ok_ref_status(ref, porcelain);
 816                 break;
 817         }
 818
 819         return 1;
 820 }
 821
 822 static void print_push_status(const char *dest, struct ref *refs,
 823                               int verbose, int porcelain, int * nonfastforward)
 824 {
 825         struct ref *ref;
 826         int n = 0;
 827
 828         if (verbose) {
 829                 for (ref = refs; ref; ref = ref->next)
 830                         if (ref->status == REF_STATUS_UPTODATE)
 831                                 n += print_one_push_status(ref, dest, n, porcelain);
 832         }
 833
 834         for (ref = refs; ref; ref = ref->next)
 835                 if (ref->status == REF_STATUS_OK)
 836                         n += print_one_push_status(ref, dest, n, porcelain);
 837
 838         *nonfastforward = 0;
 839         for (ref = refs; ref; ref = ref->next) {
 840                 if (ref->status != REF_STATUS_NONE &&
 841                     ref->status != REF_STATUS_UPTODATE &&
 842                     ref->status != REF_STATUS_OK)
 843                         n += print_one_push_status(ref, dest, n, porcelain);
 844                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD)
 845                         *nonfastforward = 1;
 846         }
 847 }
 848
 849 static void verify_remote_names(int nr_heads, const char **heads)
 850 {
 851         int i;
 852
 853         for (i = 0; i < nr_heads; i++) {
 854                 const char *local = heads[i];
 855                 const char *remote = strrchr(heads[i], ':');
 856
 857                 if (*local == '+')
 858                         local++;
 859
 860                 /* A matching refspec is okay.  */
 861                 if (remote == local && remote[1] == '\0')
 862                         continue;
 863
 864                 remote = remote ? (remote + 1) : local;
 865                 switch (check_ref_format(remote)) {
 866                 case 0: /* ok */
 867                 case CHECK_REF_FORMAT_ONELEVEL:
 868                         /* ok but a single level -- that is fine for
 869                          * a match pattern.
 870                          */
 871                 case CHECK_REF_FORMAT_WILDCARD:
 872                         /* ok but ends with a pattern-match character */
 873                         continue;
 874                 }
 875                 die("remote part of refspec is not a valid name in %s",
 876                     heads[i]);
 877         }
 878 }
 879
 880 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 881 {
 882         struct git_transport_data *data = transport->data;
 883         struct send_pack_args args;
 884         int ret;
 885
 886         if (!data->conn) {
 887                 struct ref *tmp_refs;
 888                 connect_setup(transport, 1, 0);
 889
 890                 get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 891                                  NULL);
 892         }
 893
 894         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 895         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 896         args.use_thin_pack = data->thin;
 897         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 898         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 899
 900         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 901                         &data->extra_have);
 902
 903         close(data->fd[1]);
 904         close(data->fd[0]);
 905         ret |= finish_connect(data->conn);
 906         data->conn = NULL;
 907
 908         return ret;
 909 }
 910
 911 static int disconnect_git(struct transport *transport)
 912 {
 913         struct git_transport_data *data = transport->data;
 914         if (data->conn) {
 915                 packet_flush(data->fd[1]);
 916                 close(data->fd[0]);
 917                 close(data->fd[1]);
 918                 finish_connect(data->conn);
 919         }
 920
 921         free(data);
 922         return 0;
 923 }
 924
 925 static int is_local(const char *url)
 926 {
 927         const char *colon = strchr(url, ':');
 928         const char *slash = strchr(url, '/');
 929         return !colon || (slash && slash < colon) ||
 930                 has_dos_drive_prefix(url);
 931 }
 932
 933 static int is_file(const char *url)
 934 {
 935         struct stat buf;
 936         if (stat(url, &buf))
 937                 return 0;
 938         return S_ISREG(buf.st_mode);
 939 }
 940
 941 struct transport *transport_get(struct remote *remote, const char *url)
 942 {
 943         struct transport *ret = xcalloc(1, sizeof(*ret));
 944
 945         ret->remote = remote;
 946         ret->url = url;
 947
 948         if (!prefixcmp(url, "rsync:")) {
 949                 ret->get_refs_list = get_refs_via_rsync;
 950                 ret->fetch = fetch_objs_via_rsync;
 951                 ret->push = rsync_transport_push;
 952
 953         } else if (!prefixcmp(url, "http://")
 954                 || !prefixcmp(url, "https://")
 955                 || !prefixcmp(url, "ftp://")) {
 956 #ifdef NO_CURL
 957                 error("git was compiled without libcurl support.");
 958 #else
 959                 ret->get_refs_list = get_refs_via_curl;
 960                 ret->fetch = fetch_objs_via_curl;
 961                 ret->push = curl_transport_push;
 962 #endif
 963                 ret->disconnect = disconnect_walker;
 964
 965         } else if (is_local(url) && is_file(url)) {
 966                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 967                 ret->data = data;
 968                 ret->get_refs_list = get_refs_from_bundle;
 969                 ret->fetch = fetch_refs_from_bundle;
 970                 ret->disconnect = close_bundle;
 971
 972         } else {
 973                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 974                 ret->data = data;
 975                 ret->set_option = set_git_option;
 976                 ret->get_refs_list = get_refs_via_connect;
 977                 ret->fetch = fetch_refs_via_pack;
 978                 ret->push_refs = git_transport_push;
 979                 ret->disconnect = disconnect_git;
 980
 981                 data->thin = 1;
 982                 data->conn = NULL;
 983                 data->uploadpack = "git-upload-pack";
 984                 if (remote && remote->uploadpack)
 985                         data->uploadpack = remote->uploadpack;
 986                 data->receivepack = "git-receive-pack";
 987                 if (remote && remote->receivepack)
 988                         data->receivepack = remote->receivepack;
 989         }
 990
 991         return ret;
 992 }
 993
 994 int transport_set_option(struct transport *transport,
 995                          const char *name, const char *value)
 996 {
 997         if (transport->set_option)
 998                 return transport->set_option(transport, name, value);
 999         return 1;
1000 }
1001
1002 int transport_push(struct transport *transport,
1003                    int refspec_nr, const char **refspec, int flags,
1004                    int * nonfastforward)
1005 {
1006         verify_remote_names(refspec_nr, refspec);
1007
1008         if (transport->push)
1009                 return transport->push(transport, refspec_nr, refspec, flags);
1010         if (transport->push_refs) {
1011                 struct ref *remote_refs =
1012                         transport->get_refs_list(transport, 1);
1013                 struct ref *local_refs = get_local_heads();
1014                 int match_flags = MATCH_REFS_NONE;
1015                 int verbose = flags & TRANSPORT_PUSH_VERBOSE;
1016                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1017                 int ret;
1018
1019                 if (flags & TRANSPORT_PUSH_ALL)
1020                         match_flags |= MATCH_REFS_ALL;
1021                 if (flags & TRANSPORT_PUSH_MIRROR)
1022                         match_flags |= MATCH_REFS_MIRROR;
1023
1024                 if (match_refs(local_refs, &remote_refs,
1025                                refspec_nr, refspec, match_flags)) {
1026                         return -1;
1027                 }
1028
1029                 ret = transport->push_refs(transport, remote_refs, flags);
1030
1031                 print_push_status(transport->url, remote_refs, verbose | porcelain, porcelain, nonfastforward);
1032
1033                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1034                         struct ref *ref;
1035                         for (ref = remote_refs; ref; ref = ref->next)
1036                                 update_tracking_ref(transport->remote, ref, verbose);
1037                 }
1038
1039                 if (!ret && !refs_pushed(remote_refs))
1040                         fprintf(stderr, "Everything up-to-date\n");
1041                 return ret;
1042         }
1043         return 1;
1044 }
1045
1046 const struct ref *transport_get_remote_refs(struct transport *transport)
1047 {
1048         if (!transport->remote_refs)
1049                 transport->remote_refs = transport->get_refs_list(transport, 0);
1050         return transport->remote_refs;
1051 }
1052
1053 int transport_fetch_refs(struct transport *transport, const struct ref *refs)
1054 {
1055         int rc;
1056         int nr_heads = 0, nr_alloc = 0;
1057         const struct ref **heads = NULL;
1058         const struct ref *rm;
1059
1060         for (rm = refs; rm; rm = rm->next) {
1061                 if (rm->peer_ref &&
1062                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1063                         continue;
1064                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1065                 heads[nr_heads++] = rm;
1066         }
1067
1068         rc = transport->fetch(transport, nr_heads, heads);
1069         free(heads);
1070         return rc;
1071 }
1072
1073 void transport_unlock_pack(struct transport *transport)
1074 {
1075         if (transport->pack_lockfile) {
1076                 unlink_or_warn(transport->pack_lockfile);
1077                 free(transport->pack_lockfile);
1078                 transport->pack_lockfile = NULL;
1079         }
1080 }
1081
1082 int transport_disconnect(struct transport *transport)
1083 {
1084         int ret = 0;
1085         if (transport->disconnect)
1086                 ret = transport->disconnect(transport);
1087         free(transport);
1088         return ret;
1089 }
1090
1091 /*
1092  * Strip username (and password) from an url and return
1093  * it in a newly allocated string.
1094  */
1095 char *transport_anonymize_url(const char *url)
1096 {
1097         char *anon_url, *scheme_prefix, *anon_part;
1098         size_t anon_len, prefix_len = 0;
1099
1100         anon_part = strchr(url, '@');
1101         if (is_local(url) || !anon_part)
1102                 goto literal_copy;
1103
1104         anon_len = strlen(++anon_part);
1105         scheme_prefix = strstr(url, "://");
1106         if (!scheme_prefix) {
1107                 if (!strchr(anon_part, ':'))
1108                         /* cannot be "me@there:/path/name" */
1109                         goto literal_copy;
1110         } else {
1111                 const char *cp;
1112                 /* make sure scheme is reasonable */
1113                 for (cp = url; cp < scheme_prefix; cp++) {
1114                         switch (*cp) {
1115                                 /* RFC 1738 2.1 */
1116                         case '+': case '.': case '-':
1117                                 break; /* ok */
1118                         default:
1119                                 if (isalnum(*cp))
1120                                         break;
1121                                 /* it isn't */
1122                                 goto literal_copy;
1123                         }
1124                 }
1125                 /* @ past the first slash does not count */
1126                 cp = strchr(scheme_prefix + 3, '/');
1127                 if (cp && cp < anon_part)
1128                         goto literal_copy;
1129                 prefix_len = scheme_prefix - url + 3;
1130         }
1131         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1132         memcpy(anon_url, url, prefix_len);
1133         memcpy(anon_url + prefix_len, anon_part, anon_len);
1134         return anon_url;
1135 literal_copy:
1136         return xstrdup(url);
1137 }