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