transport.c

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "run-command.h"
   4 #include "pkt-line.h"
   5 #include "fetch-pack.h"
   6 #include "remote.h"
   7 #include "connect.h"
   8 #include "send-pack.h"
   9 #include "walker.h"
  10 #include "bundle.h"
  11 #include "dir.h"
  12 #include "refs.h"
  13 #include "branch.h"
  14 #include "url.h"
  15 #include "submodule.h"
  16 #include "string-list.h"
  17 #include "sha1-array.h"
  18
  19 /* rsync support */
  20
  21 /*
  22  * We copy packed-refs and refs/ into a temporary file, then read the
  23  * loose refs recursively (sorting whenever possible), and then inserting
  24  * those packed refs that are not yet in the list (not validating, but
  25  * assuming that the file is sorted).
  26  *
  27  * Appears refactoring this from refs.c is too cumbersome.
  28  */
  29
  30 static int str_cmp(const void *a, const void *b)
  31 {
  32         const char *s1 = a;
  33         const char *s2 = b;
  34
  35         return strcmp(s1, s2);
  36 }
  37
  38 /* path->buf + name_offset is expected to point to "refs/" */
  39
  40 static int read_loose_refs(struct strbuf *path, int name_offset,
  41                 struct ref **tail)
  42 {
  43         DIR *dir = opendir(path->buf);
  44         struct dirent *de;
  45         struct {
  46                 char **entries;
  47                 int nr, alloc;
  48         } list;
  49         int i, pathlen;
  50
  51         if (!dir)
  52                 return -1;
  53
  54         memset (&list, 0, sizeof(list));
  55
  56         while ((de = readdir(dir))) {
  57                 if (is_dot_or_dotdot(de->d_name))
  58                         continue;
  59                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  60                 list.entries[list.nr++] = xstrdup(de->d_name);
  61         }
  62         closedir(dir);
  63
  64         /* sort the list */
  65
  66         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  67
  68         pathlen = path->len;
  69         strbuf_addch(path, '/');
  70
  71         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  72                 strbuf_addstr(path, list.entries[i]);
  73                 if (read_loose_refs(path, name_offset, tail)) {
  74                         int fd = open(path->buf, O_RDONLY);
  75                         char buffer[40];
  76                         struct ref *next;
  77
  78                         if (fd < 0)
  79                                 continue;
  80                         next = alloc_ref(path->buf + name_offset);
  81                         if (read_in_full(fd, buffer, 40) != 40 ||
  82                                         get_sha1_hex(buffer, next->old_sha1)) {
  83                                 close(fd);
  84                                 free(next);
  85                                 continue;
  86                         }
  87                         close(fd);
  88                         (*tail)->next = next;
  89                         *tail = next;
  90                 }
  91         }
  92         strbuf_setlen(path, pathlen);
  93
  94         for (i = 0; i < list.nr; i++)
  95                 free(list.entries[i]);
  96         free(list.entries);
  97
  98         return 0;
  99 }
 100
 101 /* insert the packed refs for which no loose refs were found */
 102
 103 static void insert_packed_refs(const char *packed_refs, struct ref **list)
 104 {
 105         FILE *f = fopen(packed_refs, "r");
 106         static char buffer[PATH_MAX];
 107
 108         if (!f)
 109                 return;
 110
 111         for (;;) {
 112                 int cmp = 0; /* assigned before used */
 113                 int len;
 114
 115                 if (!fgets(buffer, sizeof(buffer), f)) {
 116                         fclose(f);
 117                         return;
 118                 }
 119
 120                 if (hexval(buffer[0]) > 0xf)
 121                         continue;
 122                 len = strlen(buffer);
 123                 if (len && buffer[len - 1] == '\n')
 124                         buffer[--len] = '\0';
 125                 if (len < 41)
 126                         continue;
 127                 while ((*list)->next &&
 128                                 (cmp = strcmp(buffer + 41,
 129                                       (*list)->next->name)) > 0)
 130                         list = &(*list)->next;
 131                 if (!(*list)->next || cmp < 0) {
 132                         struct ref *next = alloc_ref(buffer + 41);
 133                         buffer[40] = '\0';
 134                         if (get_sha1_hex(buffer, next->old_sha1)) {
 135                                 warning ("invalid SHA-1: %s", buffer);
 136                                 free(next);
 137                                 continue;
 138                         }
 139                         next->next = (*list)->next;
 140                         (*list)->next = next;
 141                         list = &(*list)->next;
 142                 }
 143         }
 144 }
 145
 146 static void set_upstreams(struct transport *transport, struct ref *refs,
 147         int pretend)
 148 {
 149         struct ref *ref;
 150         for (ref = refs; ref; ref = ref->next) {
 151                 const char *localname;
 152                 const char *tmp;
 153                 const char *remotename;
 154                 unsigned char sha[20];
 155                 int flag = 0;
 156                 /*
 157                  * Check suitability for tracking. Must be successful /
 158                  * already up-to-date ref create/modify (not delete).
 159                  */
 160                 if (ref->status != REF_STATUS_OK &&
 161                         ref->status != REF_STATUS_UPTODATE)
 162                         continue;
 163                 if (!ref->peer_ref)
 164                         continue;
 165                 if (is_null_sha1(ref->new_sha1))
 166                         continue;
 167
 168                 /* Follow symbolic refs (mainly for HEAD). */
 169                 localname = ref->peer_ref->name;
 170                 remotename = ref->name;
 171                 tmp = resolve_ref_unsafe(localname, sha, 1, &flag);
 172                 if (tmp && flag & REF_ISSYMREF &&
 173                         !prefixcmp(tmp, "refs/heads/"))
 174                         localname = tmp;
 175
 176                 /* Both source and destination must be local branches. */
 177                 if (!localname || prefixcmp(localname, "refs/heads/"))
 178                         continue;
 179                 if (!remotename || prefixcmp(remotename, "refs/heads/"))
 180                         continue;
 181
 182                 if (!pretend)
 183                         install_branch_config(BRANCH_CONFIG_VERBOSE,
 184                                 localname + 11, transport->remote->name,
 185                                 remotename);
 186                 else
 187                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
 188                                 localname + 11, remotename + 11,
 189                                 transport->remote->name);
 190         }
 191 }
 192
 193 static const char *rsync_url(const char *url)
 194 {
 195         return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 196 }
 197
 198 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 199 {
 200         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 201         struct ref dummy = {NULL}, *tail = &dummy;
 202         struct child_process rsync;
 203         const char *args[5];
 204         int temp_dir_len;
 205
 206         if (for_push)
 207                 return NULL;
 208
 209         /* copy the refs to the temporary directory */
 210
 211         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 212         if (!mkdtemp(temp_dir.buf))
 213                 die_errno ("Could not make temporary directory");
 214         temp_dir_len = temp_dir.len;
 215
 216         strbuf_addstr(&buf, rsync_url(transport->url));
 217         strbuf_addstr(&buf, "/refs");
 218
 219         memset(&rsync, 0, sizeof(rsync));
 220         rsync.argv = args;
 221         rsync.stdout_to_stderr = 1;
 222         args[0] = "rsync";
 223         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 224         args[2] = buf.buf;
 225         args[3] = temp_dir.buf;
 226         args[4] = NULL;
 227
 228         if (run_command(&rsync))
 229                 die ("Could not run rsync to get refs");
 230
 231         strbuf_reset(&buf);
 232         strbuf_addstr(&buf, rsync_url(transport->url));
 233         strbuf_addstr(&buf, "/packed-refs");
 234
 235         args[2] = buf.buf;
 236
 237         if (run_command(&rsync))
 238                 die ("Could not run rsync to get refs");
 239
 240         /* read the copied refs */
 241
 242         strbuf_addstr(&temp_dir, "/refs");
 243         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 244         strbuf_setlen(&temp_dir, temp_dir_len);
 245
 246         tail = &dummy;
 247         strbuf_addstr(&temp_dir, "/packed-refs");
 248         insert_packed_refs(temp_dir.buf, &tail);
 249         strbuf_setlen(&temp_dir, temp_dir_len);
 250
 251         if (remove_dir_recursively(&temp_dir, 0))
 252                 warning ("Error removing temporary directory %s.",
 253                                 temp_dir.buf);
 254
 255         strbuf_release(&buf);
 256         strbuf_release(&temp_dir);
 257
 258         return dummy.next;
 259 }
 260
 261 static int fetch_objs_via_rsync(struct transport *transport,
 262                                 int nr_objs, struct ref **to_fetch)
 263 {
 264         struct strbuf buf = STRBUF_INIT;
 265         struct child_process rsync;
 266         const char *args[8];
 267         int result;
 268
 269         strbuf_addstr(&buf, rsync_url(transport->url));
 270         strbuf_addstr(&buf, "/objects/");
 271
 272         memset(&rsync, 0, sizeof(rsync));
 273         rsync.argv = args;
 274         rsync.stdout_to_stderr = 1;
 275         args[0] = "rsync";
 276         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 277         args[2] = "--ignore-existing";
 278         args[3] = "--exclude";
 279         args[4] = "info";
 280         args[5] = buf.buf;
 281         args[6] = get_object_directory();
 282         args[7] = NULL;
 283
 284         /* NEEDSWORK: handle one level of alternates */
 285         result = run_command(&rsync);
 286
 287         strbuf_release(&buf);
 288
 289         return result;
 290 }
 291
 292 static int write_one_ref(const char *name, const unsigned char *sha1,
 293                 int flags, void *data)
 294 {
 295         struct strbuf *buf = data;
 296         int len = buf->len;
 297         FILE *f;
 298
 299         /* when called via for_each_ref(), flags is non-zero */
 300         if (flags && prefixcmp(name, "refs/heads/") &&
 301                         prefixcmp(name, "refs/tags/"))
 302                 return 0;
 303
 304         strbuf_addstr(buf, name);
 305         if (safe_create_leading_directories(buf->buf) ||
 306                         !(f = fopen(buf->buf, "w")) ||
 307                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 308                         fclose(f))
 309                 return error("problems writing temporary file %s", buf->buf);
 310         strbuf_setlen(buf, len);
 311         return 0;
 312 }
 313
 314 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 315                 int refspec_nr, const char **refspec)
 316 {
 317         int i;
 318
 319         for (i = 0; i < refspec_nr; i++) {
 320                 unsigned char sha1[20];
 321                 char *ref;
 322
 323                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 324                         return error("Could not get ref %s", refspec[i]);
 325
 326                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 327                         free(ref);
 328                         return -1;
 329                 }
 330                 free(ref);
 331         }
 332         return 0;
 333 }
 334
 335 static int rsync_transport_push(struct transport *transport,
 336                 int refspec_nr, const char **refspec, int flags)
 337 {
 338         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 339         int result = 0, i;
 340         struct child_process rsync;
 341         const char *args[10];
 342
 343         if (flags & TRANSPORT_PUSH_MIRROR)
 344                 return error("rsync transport does not support mirror mode");
 345
 346         /* first push the objects */
 347
 348         strbuf_addstr(&buf, rsync_url(transport->url));
 349         strbuf_addch(&buf, '/');
 350
 351         memset(&rsync, 0, sizeof(rsync));
 352         rsync.argv = args;
 353         rsync.stdout_to_stderr = 1;
 354         i = 0;
 355         args[i++] = "rsync";
 356         args[i++] = "-a";
 357         if (flags & TRANSPORT_PUSH_DRY_RUN)
 358                 args[i++] = "--dry-run";
 359         if (transport->verbose > 1)
 360                 args[i++] = "-v";
 361         args[i++] = "--ignore-existing";
 362         args[i++] = "--exclude";
 363         args[i++] = "info";
 364         args[i++] = get_object_directory();
 365         args[i++] = buf.buf;
 366         args[i++] = NULL;
 367
 368         if (run_command(&rsync))
 369                 return error("Could not push objects to %s",
 370                                 rsync_url(transport->url));
 371
 372         /* copy the refs to the temporary directory; they could be packed. */
 373
 374         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 375         if (!mkdtemp(temp_dir.buf))
 376                 die_errno ("Could not make temporary directory");
 377         strbuf_addch(&temp_dir, '/');
 378
 379         if (flags & TRANSPORT_PUSH_ALL) {
 380                 if (for_each_ref(write_one_ref, &temp_dir))
 381                         return -1;
 382         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 383                 return -1;
 384
 385         i = 2;
 386         if (flags & TRANSPORT_PUSH_DRY_RUN)
 387                 args[i++] = "--dry-run";
 388         if (!(flags & TRANSPORT_PUSH_FORCE))
 389                 args[i++] = "--ignore-existing";
 390         args[i++] = temp_dir.buf;
 391         args[i++] = rsync_url(transport->url);
 392         args[i++] = NULL;
 393         if (run_command(&rsync))
 394                 result = error("Could not push to %s",
 395                                 rsync_url(transport->url));
 396
 397         if (remove_dir_recursively(&temp_dir, 0))
 398                 warning ("Could not remove temporary directory %s.",
 399                                 temp_dir.buf);
 400
 401         strbuf_release(&buf);
 402         strbuf_release(&temp_dir);
 403
 404         return result;
 405 }
 406
 407 struct bundle_transport_data {
 408         int fd;
 409         struct bundle_header header;
 410 };
 411
 412 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 413 {
 414         struct bundle_transport_data *data = transport->data;
 415         struct ref *result = NULL;
 416         int i;
 417
 418         if (for_push)
 419                 return NULL;
 420
 421         if (data->fd > 0)
 422                 close(data->fd);
 423         data->fd = read_bundle_header(transport->url, &data->header);
 424         if (data->fd < 0)
 425                 die ("Could not read bundle '%s'.", transport->url);
 426         for (i = 0; i < data->header.references.nr; i++) {
 427                 struct ref_list_entry *e = data->header.references.list + i;
 428                 struct ref *ref = alloc_ref(e->name);
 429                 hashcpy(ref->old_sha1, e->sha1);
 430                 ref->next = result;
 431                 result = ref;
 432         }
 433         return result;
 434 }
 435
 436 static int fetch_refs_from_bundle(struct transport *transport,
 437                                int nr_heads, struct ref **to_fetch)
 438 {
 439         struct bundle_transport_data *data = transport->data;
 440         return unbundle(&data->header, data->fd,
 441                         transport->progress ? BUNDLE_VERBOSE : 0);
 442 }
 443
 444 static int close_bundle(struct transport *transport)
 445 {
 446         struct bundle_transport_data *data = transport->data;
 447         if (data->fd > 0)
 448                 close(data->fd);
 449         free(data);
 450         return 0;
 451 }
 452
 453 struct git_transport_data {
 454         struct git_transport_options options;
 455         struct child_process *conn;
 456         int fd[2];
 457         unsigned got_remote_heads : 1;
 458         struct sha1_array extra_have;
 459 };
 460
 461 static int set_git_option(struct git_transport_options *opts,
 462                           const char *name, const char *value)
 463 {
 464         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 465                 opts->uploadpack = value;
 466                 return 0;
 467         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 468                 opts->receivepack = value;
 469                 return 0;
 470         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 471                 opts->thin = !!value;
 472                 return 0;
 473         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 474                 opts->followtags = !!value;
 475                 return 0;
 476         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 477                 opts->keep = !!value;
 478                 return 0;
 479         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 480                 if (!value)
 481                         opts->depth = 0;
 482                 else {
 483                         char *end;
 484                         opts->depth = strtol(value, &end, 0);
 485                         if (*end)
 486                                 die("transport: invalid depth option '%s'", value);
 487                 }
 488                 return 0;
 489         }
 490         return 1;
 491 }
 492
 493 static int connect_setup(struct transport *transport, int for_push, int verbose)
 494 {
 495         struct git_transport_data *data = transport->data;
 496
 497         if (data->conn)
 498                 return 0;
 499
 500         data->conn = git_connect(data->fd, transport->url,
 501                                  for_push ? data->options.receivepack :
 502                                  data->options.uploadpack,
 503                                  verbose ? CONNECT_VERBOSE : 0);
 504
 505         return 0;
 506 }
 507
 508 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 509 {
 510         struct git_transport_data *data = transport->data;
 511         struct ref *refs;
 512
 513         connect_setup(transport, for_push, 0);
 514         get_remote_heads(data->fd[0], NULL, 0, &refs,
 515                          for_push ? REF_NORMAL : 0, &data->extra_have);
 516         data->got_remote_heads = 1;
 517
 518         return refs;
 519 }
 520
 521 static int fetch_refs_via_pack(struct transport *transport,
 522                                int nr_heads, struct ref **to_fetch)
 523 {
 524         struct git_transport_data *data = transport->data;
 525         const struct ref *refs;
 526         char *dest = xstrdup(transport->url);
 527         struct fetch_pack_args args;
 528         struct ref *refs_tmp = NULL;
 529
 530         memset(&args, 0, sizeof(args));
 531         args.uploadpack = data->options.uploadpack;
 532         args.keep_pack = data->options.keep;
 533         args.lock_pack = 1;
 534         args.use_thin_pack = data->options.thin;
 535         args.include_tag = data->options.followtags;
 536         args.verbose = (transport->verbose > 1);
 537         args.quiet = (transport->verbose < 0);
 538         args.no_progress = !transport->progress;
 539         args.depth = data->options.depth;
 540         args.check_self_contained_and_connected =
 541                 data->options.check_self_contained_and_connected;
 542
 543         if (!data->got_remote_heads) {
 544                 connect_setup(transport, 0, 0);
 545                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0, NULL);
 546                 data->got_remote_heads = 1;
 547         }
 548
 549         refs = fetch_pack(&args, data->fd, data->conn,
 550                           refs_tmp ? refs_tmp : transport->remote_refs,
 551                           dest, to_fetch, nr_heads,
 552                           &transport->pack_lockfile);
 553         close(data->fd[0]);
 554         close(data->fd[1]);
 555         if (finish_connect(data->conn))
 556                 refs = NULL;
 557         data->conn = NULL;
 558         data->got_remote_heads = 0;
 559         data->options.self_contained_and_connected =
 560                 args.self_contained_and_connected;
 561
 562         free_refs(refs_tmp);
 563
 564         free(dest);
 565         return (refs ? 0 : -1);
 566 }
 567
 568 static int push_had_errors(struct ref *ref)
 569 {
 570         for (; ref; ref = ref->next) {
 571                 switch (ref->status) {
 572                 case REF_STATUS_NONE:
 573                 case REF_STATUS_UPTODATE:
 574                 case REF_STATUS_OK:
 575                         break;
 576                 default:
 577                         return 1;
 578                 }
 579         }
 580         return 0;
 581 }
 582
 583 int transport_refs_pushed(struct ref *ref)
 584 {
 585         for (; ref; ref = ref->next) {
 586                 switch(ref->status) {
 587                 case REF_STATUS_NONE:
 588                 case REF_STATUS_UPTODATE:
 589                         break;
 590                 default:
 591                         return 1;
 592                 }
 593         }
 594         return 0;
 595 }
 596
 597 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 598 {
 599         struct refspec rs;
 600
 601         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 602                 return;
 603
 604         rs.src = ref->name;
 605         rs.dst = NULL;
 606
 607         if (!remote_find_tracking(remote, &rs)) {
 608                 if (verbose)
 609                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 610                 if (ref->deletion) {
 611                         delete_ref(rs.dst, NULL, 0);
 612                 } else
 613                         update_ref("update by push", rs.dst,
 614                                         ref->new_sha1, NULL, 0, 0);
 615                 free(rs.dst);
 616         }
 617 }
 618
 619 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 620 {
 621         if (porcelain) {
 622                 if (from)
 623                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 624                 else
 625                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 626                 if (msg)
 627                         fprintf(stdout, "%s (%s)\n", summary, msg);
 628                 else
 629                         fprintf(stdout, "%s\n", summary);
 630         } else {
 631                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 632                 if (from)
 633                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 634                 else
 635                         fputs(prettify_refname(to->name), stderr);
 636                 if (msg) {
 637                         fputs(" (", stderr);
 638                         fputs(msg, stderr);
 639                         fputc(')', stderr);
 640                 }
 641                 fputc('\n', stderr);
 642         }
 643 }
 644
 645 static const char *status_abbrev(unsigned char sha1[20])
 646 {
 647         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 648 }
 649
 650 static void print_ok_ref_status(struct ref *ref, int porcelain)
 651 {
 652         if (ref->deletion)
 653                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 654         else if (is_null_sha1(ref->old_sha1))
 655                 print_ref_status('*',
 656                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 657                         "[new branch]"),
 658                         ref, ref->peer_ref, NULL, porcelain);
 659         else {
 660                 char quickref[84];
 661                 char type;
 662                 const char *msg;
 663
 664                 strcpy(quickref, status_abbrev(ref->old_sha1));
 665                 if (ref->forced_update) {
 666                         strcat(quickref, "...");
 667                         type = '+';
 668                         msg = "forced update";
 669                 } else {
 670                         strcat(quickref, "..");
 671                         type = ' ';
 672                         msg = NULL;
 673                 }
 674                 strcat(quickref, status_abbrev(ref->new_sha1));
 675
 676                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 677         }
 678 }
 679
 680 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 681 {
 682         if (!count)
 683                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 684
 685         switch(ref->status) {
 686         case REF_STATUS_NONE:
 687                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 688                 break;
 689         case REF_STATUS_REJECT_NODELETE:
 690                 print_ref_status('!', "[rejected]", ref, NULL,
 691                                                  "remote does not support deleting refs", porcelain);
 692                 break;
 693         case REF_STATUS_UPTODATE:
 694                 print_ref_status('=', "[up to date]", ref,
 695                                                  ref->peer_ref, NULL, porcelain);
 696                 break;
 697         case REF_STATUS_REJECT_NONFASTFORWARD:
 698                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 699                                                  "non-fast-forward", porcelain);
 700                 break;
 701         case REF_STATUS_REJECT_ALREADY_EXISTS:
 702                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 703                                                  "already exists", porcelain);
 704                 break;
 705         case REF_STATUS_REJECT_FETCH_FIRST:
 706                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 707                                                  "fetch first", porcelain);
 708                 break;
 709         case REF_STATUS_REJECT_NEEDS_FORCE:
 710                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 711                                                  "needs force", porcelain);
 712                 break;
 713         case REF_STATUS_REJECT_STALE:
 714                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 715                                                  "stale info", porcelain);
 716                 break;
 717         case REF_STATUS_REMOTE_REJECT:
 718                 print_ref_status('!', "[remote rejected]", ref,
 719                                                  ref->deletion ? NULL : ref->peer_ref,
 720                                                  ref->remote_status, porcelain);
 721                 break;
 722         case REF_STATUS_EXPECTING_REPORT:
 723                 print_ref_status('!', "[remote failure]", ref,
 724                                                  ref->deletion ? NULL : ref->peer_ref,
 725                                                  "remote failed to report status", porcelain);
 726                 break;
 727         case REF_STATUS_OK:
 728                 print_ok_ref_status(ref, porcelain);
 729                 break;
 730         }
 731
 732         return 1;
 733 }
 734
 735 void transport_print_push_status(const char *dest, struct ref *refs,
 736                                   int verbose, int porcelain, unsigned int *reject_reasons)
 737 {
 738         struct ref *ref;
 739         int n = 0;
 740         unsigned char head_sha1[20];
 741         char *head;
 742
 743         head = resolve_refdup("HEAD", head_sha1, 1, NULL);
 744
 745         if (verbose) {
 746                 for (ref = refs; ref; ref = ref->next)
 747                         if (ref->status == REF_STATUS_UPTODATE)
 748                                 n += print_one_push_status(ref, dest, n, porcelain);
 749         }
 750
 751         for (ref = refs; ref; ref = ref->next)
 752                 if (ref->status == REF_STATUS_OK)
 753                         n += print_one_push_status(ref, dest, n, porcelain);
 754
 755         *reject_reasons = 0;
 756         for (ref = refs; ref; ref = ref->next) {
 757                 if (ref->status != REF_STATUS_NONE &&
 758                     ref->status != REF_STATUS_UPTODATE &&
 759                     ref->status != REF_STATUS_OK)
 760                         n += print_one_push_status(ref, dest, n, porcelain);
 761                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 762                         if (head != NULL && !strcmp(head, ref->name))
 763                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 764                         else
 765                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 766                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 767                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 768                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 769                         *reject_reasons |= REJECT_FETCH_FIRST;
 770                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 771                         *reject_reasons |= REJECT_NEEDS_FORCE;
 772                 }
 773         }
 774 }
 775
 776 void transport_verify_remote_names(int nr_heads, const char **heads)
 777 {
 778         int i;
 779
 780         for (i = 0; i < nr_heads; i++) {
 781                 const char *local = heads[i];
 782                 const char *remote = strrchr(heads[i], ':');
 783
 784                 if (*local == '+')
 785                         local++;
 786
 787                 /* A matching refspec is okay.  */
 788                 if (remote == local && remote[1] == '\0')
 789                         continue;
 790
 791                 remote = remote ? (remote + 1) : local;
 792                 if (check_refname_format(remote,
 793                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 794                         die("remote part of refspec is not a valid name in %s",
 795                                 heads[i]);
 796         }
 797 }
 798
 799 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 800 {
 801         struct git_transport_data *data = transport->data;
 802         struct send_pack_args args;
 803         int ret;
 804
 805         if (!data->got_remote_heads) {
 806                 struct ref *tmp_refs;
 807                 connect_setup(transport, 1, 0);
 808
 809                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL, NULL);
 810                 data->got_remote_heads = 1;
 811         }
 812
 813         memset(&args, 0, sizeof(args));
 814         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 815         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 816         args.use_thin_pack = data->options.thin;
 817         args.verbose = (transport->verbose > 0);
 818         args.quiet = (transport->verbose < 0);
 819         args.progress = transport->progress;
 820         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 821         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 822
 823         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 824                         &data->extra_have);
 825
 826         close(data->fd[1]);
 827         close(data->fd[0]);
 828         ret |= finish_connect(data->conn);
 829         data->conn = NULL;
 830         data->got_remote_heads = 0;
 831
 832         return ret;
 833 }
 834
 835 static int connect_git(struct transport *transport, const char *name,
 836                        const char *executable, int fd[2])
 837 {
 838         struct git_transport_data *data = transport->data;
 839         data->conn = git_connect(data->fd, transport->url,
 840                                  executable, 0);
 841         fd[0] = data->fd[0];
 842         fd[1] = data->fd[1];
 843         return 0;
 844 }
 845
 846 static int disconnect_git(struct transport *transport)
 847 {
 848         struct git_transport_data *data = transport->data;
 849         if (data->conn) {
 850                 if (data->got_remote_heads)
 851                         packet_flush(data->fd[1]);
 852                 close(data->fd[0]);
 853                 close(data->fd[1]);
 854                 finish_connect(data->conn);
 855         }
 856
 857         free(data);
 858         return 0;
 859 }
 860
 861 void transport_take_over(struct transport *transport,
 862                          struct child_process *child)
 863 {
 864         struct git_transport_data *data;
 865
 866         if (!transport->smart_options)
 867                 die("Bug detected: Taking over transport requires non-NULL "
 868                     "smart_options field.");
 869
 870         data = xcalloc(1, sizeof(*data));
 871         data->options = *transport->smart_options;
 872         data->conn = child;
 873         data->fd[0] = data->conn->out;
 874         data->fd[1] = data->conn->in;
 875         data->got_remote_heads = 0;
 876         transport->data = data;
 877
 878         transport->set_option = NULL;
 879         transport->get_refs_list = get_refs_via_connect;
 880         transport->fetch = fetch_refs_via_pack;
 881         transport->push = NULL;
 882         transport->push_refs = git_transport_push;
 883         transport->disconnect = disconnect_git;
 884         transport->smart_options = &(data->options);
 885
 886         transport->cannot_reuse = 1;
 887 }
 888
 889 static int is_local(const char *url)
 890 {
 891         const char *colon = strchr(url, ':');
 892         const char *slash = strchr(url, '/');
 893         return !colon || (slash && slash < colon) ||
 894                 has_dos_drive_prefix(url);
 895 }
 896
 897 static int is_file(const char *url)
 898 {
 899         struct stat buf;
 900         if (stat(url, &buf))
 901                 return 0;
 902         return S_ISREG(buf.st_mode);
 903 }
 904
 905 static int external_specification_len(const char *url)
 906 {
 907         return strchr(url, ':') - url;
 908 }
 909
 910 struct transport *transport_get(struct remote *remote, const char *url)
 911 {
 912         const char *helper;
 913         struct transport *ret = xcalloc(1, sizeof(*ret));
 914
 915         ret->progress = isatty(2);
 916
 917         if (!remote)
 918                 die("No remote provided to transport_get()");
 919
 920         ret->got_remote_refs = 0;
 921         ret->remote = remote;
 922         helper = remote->foreign_vcs;
 923
 924         if (!url && remote->url)
 925                 url = remote->url[0];
 926         ret->url = url;
 927
 928         /* maybe it is a foreign URL? */
 929         if (url) {
 930                 const char *p = url;
 931
 932                 while (is_urlschemechar(p == url, *p))
 933                         p++;
 934                 if (!prefixcmp(p, "::"))
 935                         helper = xstrndup(url, p - url);
 936         }
 937
 938         if (helper) {
 939                 transport_helper_init(ret, helper);
 940         } else if (!prefixcmp(url, "rsync:")) {
 941                 ret->get_refs_list = get_refs_via_rsync;
 942                 ret->fetch = fetch_objs_via_rsync;
 943                 ret->push = rsync_transport_push;
 944                 ret->smart_options = NULL;
 945         } else if (is_local(url) && is_file(url) && is_bundle(url, 1)) {
 946                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 947                 ret->data = data;
 948                 ret->get_refs_list = get_refs_from_bundle;
 949                 ret->fetch = fetch_refs_from_bundle;
 950                 ret->disconnect = close_bundle;
 951                 ret->smart_options = NULL;
 952         } else if (!is_url(url)
 953                 || !prefixcmp(url, "file://")
 954                 || !prefixcmp(url, "git://")
 955                 || !prefixcmp(url, "ssh://")
 956                 || !prefixcmp(url, "git+ssh://")
 957                 || !prefixcmp(url, "ssh+git://")) {
 958                 /* These are builtin smart transports. */
 959                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 960                 ret->data = data;
 961                 ret->set_option = NULL;
 962                 ret->get_refs_list = get_refs_via_connect;
 963                 ret->fetch = fetch_refs_via_pack;
 964                 ret->push_refs = git_transport_push;
 965                 ret->connect = connect_git;
 966                 ret->disconnect = disconnect_git;
 967                 ret->smart_options = &(data->options);
 968
 969                 data->conn = NULL;
 970                 data->got_remote_heads = 0;
 971         } else {
 972                 /* Unknown protocol in URL. Pass to external handler. */
 973                 int len = external_specification_len(url);
 974                 char *handler = xmalloc(len + 1);
 975                 handler[len] = 0;
 976                 strncpy(handler, url, len);
 977                 transport_helper_init(ret, handler);
 978         }
 979
 980         if (ret->smart_options) {
 981                 ret->smart_options->thin = 1;
 982                 ret->smart_options->uploadpack = "git-upload-pack";
 983                 if (remote->uploadpack)
 984                         ret->smart_options->uploadpack = remote->uploadpack;
 985                 ret->smart_options->receivepack = "git-receive-pack";
 986                 if (remote->receivepack)
 987                         ret->smart_options->receivepack = remote->receivepack;
 988         }
 989
 990         return ret;
 991 }
 992
 993 int transport_set_option(struct transport *transport,
 994                          const char *name, const char *value)
 995 {
 996         int git_reports = 1, protocol_reports = 1;
 997
 998         if (transport->smart_options)
 999                 git_reports = set_git_option(transport->smart_options,
1000                                              name, value);
1001
1002         if (transport->set_option)
1003                 protocol_reports = transport->set_option(transport, name,
1004                                                         value);
1005
1006         /* If either report is 0, report 0 (success). */
1007         if (!git_reports || !protocol_reports)
1008                 return 0;
1009         /* If either reports -1 (invalid value), report -1. */
1010         if ((git_reports == -1) || (protocol_reports == -1))
1011                 return -1;
1012         /* Otherwise if both report unknown, report unknown. */
1013         return 1;
1014 }
1015
1016 void transport_set_verbosity(struct transport *transport, int verbosity,
1017         int force_progress)
1018 {
1019         if (verbosity >= 1)
1020                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1021         if (verbosity < 0)
1022                 transport->verbose = -1;
1023
1024         /**
1025          * Rules used to determine whether to report progress (processing aborts
1026          * when a rule is satisfied):
1027          *
1028          *   . Report progress, if force_progress is 1 (ie. --progress).
1029          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1030          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1031          *   . Report progress if isatty(2) is 1.
1032          **/
1033         if (force_progress >= 0)
1034                 transport->progress = !!force_progress;
1035         else
1036                 transport->progress = verbosity >= 0 && isatty(2);
1037 }
1038
1039 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1040 {
1041         int i;
1042
1043         fprintf(stderr, "The following submodule paths contain changes that can\n"
1044                         "not be found on any remote:\n");
1045         for (i = 0; i < needs_pushing->nr; i++)
1046                 printf("  %s\n", needs_pushing->items[i].string);
1047         fprintf(stderr, "\nPlease try\n\n"
1048                         "       git push --recurse-submodules=on-demand\n\n"
1049                         "or cd to the path and use\n\n"
1050                         "       git push\n\n"
1051                         "to push them to a remote.\n\n");
1052
1053         string_list_clear(needs_pushing, 0);
1054
1055         die("Aborting.");
1056 }
1057
1058 static int run_pre_push_hook(struct transport *transport,
1059                              struct ref *remote_refs)
1060 {
1061         int ret = 0, x;
1062         struct ref *r;
1063         struct child_process proc;
1064         struct strbuf buf;
1065         const char *argv[4];
1066
1067         if (!(argv[0] = find_hook("pre-push")))
1068                 return 0;
1069
1070         argv[1] = transport->remote->name;
1071         argv[2] = transport->url;
1072         argv[3] = NULL;
1073
1074         memset(&proc, 0, sizeof(proc));
1075         proc.argv = argv;
1076         proc.in = -1;
1077
1078         if (start_command(&proc)) {
1079                 finish_command(&proc);
1080                 return -1;
1081         }
1082
1083         strbuf_init(&buf, 256);
1084
1085         for (r = remote_refs; r; r = r->next) {
1086                 if (!r->peer_ref) continue;
1087                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1088                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1089                 if (r->status == REF_STATUS_UPTODATE) continue;
1090
1091                 strbuf_reset(&buf);
1092                 strbuf_addf( &buf, "%s %s %s %s\n",
1093                          r->peer_ref->name, sha1_to_hex(r->new_sha1),
1094                          r->name, sha1_to_hex(r->old_sha1));
1095
1096                 if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1097                         ret = -1;
1098                         break;
1099                 }
1100         }
1101
1102         strbuf_release(&buf);
1103
1104         x = close(proc.in);
1105         if (!ret)
1106                 ret = x;
1107
1108         x = finish_command(&proc);
1109         if (!ret)
1110                 ret = x;
1111
1112         return ret;
1113 }
1114
1115 int transport_push(struct transport *transport,
1116                    int refspec_nr, const char **refspec, int flags,
1117                    unsigned int *reject_reasons)
1118 {
1119         *reject_reasons = 0;
1120         transport_verify_remote_names(refspec_nr, refspec);
1121
1122         if (transport->push) {
1123                 /* Maybe FIXME. But no important transport uses this case. */
1124                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1125                         die("This transport does not support using --set-upstream");
1126
1127                 return transport->push(transport, refspec_nr, refspec, flags);
1128         } else if (transport->push_refs) {
1129                 struct ref *remote_refs =
1130                         transport->get_refs_list(transport, 1);
1131                 struct ref *local_refs = get_local_heads();
1132                 int match_flags = MATCH_REFS_NONE;
1133                 int verbose = (transport->verbose > 0);
1134                 int quiet = (transport->verbose < 0);
1135                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1136                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1137                 int push_ret, ret, err;
1138
1139                 if (flags & TRANSPORT_PUSH_ALL)
1140                         match_flags |= MATCH_REFS_ALL;
1141                 if (flags & TRANSPORT_PUSH_MIRROR)
1142                         match_flags |= MATCH_REFS_MIRROR;
1143                 if (flags & TRANSPORT_PUSH_PRUNE)
1144                         match_flags |= MATCH_REFS_PRUNE;
1145                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1146                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1147
1148                 if (match_push_refs(local_refs, &remote_refs,
1149                                     refspec_nr, refspec, match_flags)) {
1150                         return -1;
1151                 }
1152
1153                 if (transport->smart_options &&
1154                     transport->smart_options->cas &&
1155                     !is_empty_cas(transport->smart_options->cas))
1156                         apply_push_cas(transport->smart_options->cas,
1157                                        transport->remote, remote_refs);
1158
1159                 set_ref_status_for_push(remote_refs,
1160                         flags & TRANSPORT_PUSH_MIRROR,
1161                         flags & TRANSPORT_PUSH_FORCE);
1162
1163                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1164                         if (run_pre_push_hook(transport, remote_refs))
1165                                 return -1;
1166
1167                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1168                         struct ref *ref = remote_refs;
1169                         for (; ref; ref = ref->next)
1170                                 if (!is_null_sha1(ref->new_sha1) &&
1171                                     !push_unpushed_submodules(ref->new_sha1,
1172                                             transport->remote->name))
1173                                     die ("Failed to push all needed submodules!");
1174                 }
1175
1176                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1177                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1178                         struct ref *ref = remote_refs;
1179                         struct string_list needs_pushing;
1180
1181                         memset(&needs_pushing, 0, sizeof(struct string_list));
1182                         needs_pushing.strdup_strings = 1;
1183                         for (; ref; ref = ref->next)
1184                                 if (!is_null_sha1(ref->new_sha1) &&
1185                                     find_unpushed_submodules(ref->new_sha1,
1186                                             transport->remote->name, &needs_pushing))
1187                                         die_with_unpushed_submodules(&needs_pushing);
1188                 }
1189
1190                 push_ret = transport->push_refs(transport, remote_refs, flags);
1191                 err = push_had_errors(remote_refs);
1192                 ret = push_ret | err;
1193
1194                 if (!quiet || err)
1195                         transport_print_push_status(transport->url, remote_refs,
1196                                         verbose | porcelain, porcelain,
1197                                         reject_reasons);
1198
1199                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1200                         set_upstreams(transport, remote_refs, pretend);
1201
1202                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1203                         struct ref *ref;
1204                         for (ref = remote_refs; ref; ref = ref->next)
1205                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1206                 }
1207
1208                 if (porcelain && !push_ret)
1209                         puts("Done");
1210                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1211                         fprintf(stderr, "Everything up-to-date\n");
1212
1213                 return ret;
1214         }
1215         return 1;
1216 }
1217
1218 const struct ref *transport_get_remote_refs(struct transport *transport)
1219 {
1220         if (!transport->got_remote_refs) {
1221                 transport->remote_refs = transport->get_refs_list(transport, 0);
1222                 transport->got_remote_refs = 1;
1223         }
1224
1225         return transport->remote_refs;
1226 }
1227
1228 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1229 {
1230         int rc;
1231         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1232         struct ref **heads = NULL;
1233         struct ref *rm;
1234
1235         for (rm = refs; rm; rm = rm->next) {
1236                 nr_refs++;
1237                 if (rm->peer_ref &&
1238                     !is_null_sha1(rm->old_sha1) &&
1239                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1240                         continue;
1241                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1242                 heads[nr_heads++] = rm;
1243         }
1244
1245         if (!nr_heads) {
1246                 /*
1247                  * When deepening of a shallow repository is requested,
1248                  * then local and remote refs are likely to still be equal.
1249                  * Just feed them all to the fetch method in that case.
1250                  * This condition shouldn't be met in a non-deepening fetch
1251                  * (see builtin/fetch.c:quickfetch()).
1252                  */
1253                 heads = xmalloc(nr_refs * sizeof(*heads));
1254                 for (rm = refs; rm; rm = rm->next)
1255                         heads[nr_heads++] = rm;
1256         }
1257
1258         rc = transport->fetch(transport, nr_heads, heads);
1259
1260         free(heads);
1261         return rc;
1262 }
1263
1264 void transport_unlock_pack(struct transport *transport)
1265 {
1266         if (transport->pack_lockfile) {
1267                 unlink_or_warn(transport->pack_lockfile);
1268                 free(transport->pack_lockfile);
1269                 transport->pack_lockfile = NULL;
1270         }
1271 }
1272
1273 int transport_connect(struct transport *transport, const char *name,
1274                       const char *exec, int fd[2])
1275 {
1276         if (transport->connect)
1277                 return transport->connect(transport, name, exec, fd);
1278         else
1279                 die("Operation not supported by protocol");
1280 }
1281
1282 int transport_disconnect(struct transport *transport)
1283 {
1284         int ret = 0;
1285         if (transport->disconnect)
1286                 ret = transport->disconnect(transport);
1287         free(transport);
1288         return ret;
1289 }
1290
1291 /*
1292  * Strip username (and password) from a URL and return
1293  * it in a newly allocated string.
1294  */
1295 char *transport_anonymize_url(const char *url)
1296 {
1297         char *anon_url, *scheme_prefix, *anon_part;
1298         size_t anon_len, prefix_len = 0;
1299
1300         anon_part = strchr(url, '@');
1301         if (is_local(url) || !anon_part)
1302                 goto literal_copy;
1303
1304         anon_len = strlen(++anon_part);
1305         scheme_prefix = strstr(url, "://");
1306         if (!scheme_prefix) {
1307                 if (!strchr(anon_part, ':'))
1308                         /* cannot be "me@there:/path/name" */
1309                         goto literal_copy;
1310         } else {
1311                 const char *cp;
1312                 /* make sure scheme is reasonable */
1313                 for (cp = url; cp < scheme_prefix; cp++) {
1314                         switch (*cp) {
1315                                 /* RFC 1738 2.1 */
1316                         case '+': case '.': case '-':
1317                                 break; /* ok */
1318                         default:
1319                                 if (isalnum(*cp))
1320                                         break;
1321                                 /* it isn't */
1322                                 goto literal_copy;
1323                         }
1324                 }
1325                 /* @ past the first slash does not count */
1326                 cp = strchr(scheme_prefix + 3, '/');
1327                 if (cp && cp < anon_part)
1328                         goto literal_copy;
1329                 prefix_len = scheme_prefix - url + 3;
1330         }
1331         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1332         memcpy(anon_url, url, prefix_len);
1333         memcpy(anon_url + prefix_len, anon_part, anon_len);
1334         return anon_url;
1335 literal_copy:
1336         return xstrdup(url);
1337 }
1338
1339 struct alternate_refs_data {
1340         alternate_ref_fn *fn;
1341         void *data;
1342 };
1343
1344 static int refs_from_alternate_cb(struct alternate_object_database *e,
1345                                   void *data)
1346 {
1347         char *other;
1348         size_t len;
1349         struct remote *remote;
1350         struct transport *transport;
1351         const struct ref *extra;
1352         struct alternate_refs_data *cb = data;
1353
1354         e->name[-1] = '\0';
1355         other = xstrdup(real_path(e->base));
1356         e->name[-1] = '/';
1357         len = strlen(other);
1358
1359         while (other[len-1] == '/')
1360                 other[--len] = '\0';
1361         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1362                 return 0;
1363         /* Is this a git repository with refs? */
1364         memcpy(other + len - 8, "/refs", 6);
1365         if (!is_directory(other))
1366                 return 0;
1367         other[len - 8] = '\0';
1368         remote = remote_get(other);
1369         transport = transport_get(remote, other);
1370         for (extra = transport_get_remote_refs(transport);
1371              extra;
1372              extra = extra->next)
1373                 cb->fn(extra, cb->data);
1374         transport_disconnect(transport);
1375         free(other);
1376         return 0;
1377 }
1378
1379 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1380 {
1381         struct alternate_refs_data cb;
1382         cb.fn = fn;
1383         cb.data = data;
1384         foreach_alt_odb(refs_from_alternate_cb, &cb);
1385 }