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