transport.c

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "run-command.h"
   4 #include "pkt-line.h"
   5 #include "fetch-pack.h"
   6 #include "remote.h"
   7 #include "connect.h"
   8 #include "send-pack.h"
   9 #include "walker.h"
  10 #include "bundle.h"
  11 #include "dir.h"
  12 #include "refs.h"
  13 #include "branch.h"
  14 #include "url.h"
  15 #include "submodule.h"
  16 #include "string-list.h"
  17 #include "sha1-array.h"
  18
  19 /* rsync support */
  20
  21 /*
  22  * We copy packed-refs and refs/ into a temporary file, then read the
  23  * loose refs recursively (sorting whenever possible), and then inserting
  24  * those packed refs that are not yet in the list (not validating, but
  25  * assuming that the file is sorted).
  26  *
  27  * Appears refactoring this from refs.c is too cumbersome.
  28  */
  29
  30 static int str_cmp(const void *a, const void *b)
  31 {
  32         const char *s1 = a;
  33         const char *s2 = b;
  34
  35         return strcmp(s1, s2);
  36 }
  37
  38 /* path->buf + name_offset is expected to point to "refs/" */
  39
  40 static int read_loose_refs(struct strbuf *path, int name_offset,
  41                 struct ref **tail)
  42 {
  43         DIR *dir = opendir(path->buf);
  44         struct dirent *de;
  45         struct {
  46                 char **entries;
  47                 int nr, alloc;
  48         } list;
  49         int i, pathlen;
  50
  51         if (!dir)
  52                 return -1;
  53
  54         memset (&list, 0, sizeof(list));
  55
  56         while ((de = readdir(dir))) {
  57                 if (is_dot_or_dotdot(de->d_name))
  58                         continue;
  59                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  60                 list.entries[list.nr++] = xstrdup(de->d_name);
  61         }
  62         closedir(dir);
  63
  64         /* sort the list */
  65
  66         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  67
  68         pathlen = path->len;
  69         strbuf_addch(path, '/');
  70
  71         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  72                 strbuf_addstr(path, list.entries[i]);
  73                 if (read_loose_refs(path, name_offset, tail)) {
  74                         int fd = open(path->buf, O_RDONLY);
  75                         char buffer[40];
  76                         struct ref *next;
  77
  78                         if (fd < 0)
  79                                 continue;
  80                         next = alloc_ref(path->buf + name_offset);
  81                         if (read_in_full(fd, buffer, 40) != 40 ||
  82                                         get_sha1_hex(buffer, next->old_sha1)) {
  83                                 close(fd);
  84                                 free(next);
  85                                 continue;
  86                         }
  87                         close(fd);
  88                         (*tail)->next = next;
  89                         *tail = next;
  90                 }
  91         }
  92         strbuf_setlen(path, pathlen);
  93
  94         for (i = 0; i < list.nr; i++)
  95                 free(list.entries[i]);
  96         free(list.entries);
  97
  98         return 0;
  99 }
 100
 101 /* insert the packed refs for which no loose refs were found */
 102
 103 static void insert_packed_refs(const char *packed_refs, struct ref **list)
 104 {
 105         FILE *f = fopen(packed_refs, "r");
 106         static char buffer[PATH_MAX];
 107
 108         if (!f)
 109                 return;
 110
 111         for (;;) {
 112                 int cmp = 0; /* assigned before used */
 113                 int len;
 114
 115                 if (!fgets(buffer, sizeof(buffer), f)) {
 116                         fclose(f);
 117                         return;
 118                 }
 119
 120                 if (hexval(buffer[0]) > 0xf)
 121                         continue;
 122                 len = strlen(buffer);
 123                 if (len && buffer[len - 1] == '\n')
 124                         buffer[--len] = '\0';
 125                 if (len < 41)
 126                         continue;
 127                 while ((*list)->next &&
 128                                 (cmp = strcmp(buffer + 41,
 129                                       (*list)->next->name)) > 0)
 130                         list = &(*list)->next;
 131                 if (!(*list)->next || cmp < 0) {
 132                         struct ref *next = alloc_ref(buffer + 41);
 133                         buffer[40] = '\0';
 134                         if (get_sha1_hex(buffer, next->old_sha1)) {
 135                                 warning ("invalid SHA-1: %s", buffer);
 136                                 free(next);
 137                                 continue;
 138                         }
 139                         next->next = (*list)->next;
 140                         (*list)->next = next;
 141                         list = &(*list)->next;
 142                 }
 143         }
 144 }
 145
 146 static void set_upstreams(struct transport *transport, struct ref *refs,
 147         int pretend)
 148 {
 149         struct ref *ref;
 150         for (ref = refs; ref; ref = ref->next) {
 151                 const char *localname;
 152                 const char *tmp;
 153                 const char *remotename;
 154                 unsigned char sha[20];
 155                 int flag = 0;
 156                 /*
 157                  * Check suitability for tracking. Must be successful /
 158                  * already up-to-date ref create/modify (not delete).
 159                  */
 160                 if (ref->status != REF_STATUS_OK &&
 161                         ref->status != REF_STATUS_UPTODATE)
 162                         continue;
 163                 if (!ref->peer_ref)
 164                         continue;
 165                 if (is_null_sha1(ref->new_sha1))
 166                         continue;
 167
 168                 /* Follow symbolic refs (mainly for HEAD). */
 169                 localname = ref->peer_ref->name;
 170                 remotename = ref->name;
 171                 tmp = resolve_ref_unsafe(localname, sha, 1, &flag);
 172                 if (tmp && flag & REF_ISSYMREF &&
 173                         starts_with(tmp, "refs/heads/"))
 174                         localname = tmp;
 175
 176                 /* Both source and destination must be local branches. */
 177                 if (!localname || !starts_with(localname, "refs/heads/"))
 178                         continue;
 179                 if (!remotename || !starts_with(remotename, "refs/heads/"))
 180                         continue;
 181
 182                 if (!pretend)
 183                         install_branch_config(BRANCH_CONFIG_VERBOSE,
 184                                 localname + 11, transport->remote->name,
 185                                 remotename);
 186                 else
 187                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
 188                                 localname + 11, remotename + 11,
 189                                 transport->remote->name);
 190         }
 191 }
 192
 193 static const char *rsync_url(const char *url)
 194 {
 195         if (!starts_with(url, "rsync://"))
 196                 skip_prefix(url, "rsync:", &url);
 197         return url;
 198 }
 199
 200 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 201 {
 202         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 203         struct ref dummy = {NULL}, *tail = &dummy;
 204         struct child_process rsync;
 205         const char *args[5];
 206         int temp_dir_len;
 207
 208         if (for_push)
 209                 return NULL;
 210
 211         /* copy the refs to the temporary directory */
 212
 213         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 214         if (!mkdtemp(temp_dir.buf))
 215                 die_errno ("Could not make temporary directory");
 216         temp_dir_len = temp_dir.len;
 217
 218         strbuf_addstr(&buf, rsync_url(transport->url));
 219         strbuf_addstr(&buf, "/refs");
 220
 221         memset(&rsync, 0, sizeof(rsync));
 222         rsync.argv = args;
 223         rsync.stdout_to_stderr = 1;
 224         args[0] = "rsync";
 225         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 226         args[2] = buf.buf;
 227         args[3] = temp_dir.buf;
 228         args[4] = NULL;
 229
 230         if (run_command(&rsync))
 231                 die ("Could not run rsync to get refs");
 232
 233         strbuf_reset(&buf);
 234         strbuf_addstr(&buf, rsync_url(transport->url));
 235         strbuf_addstr(&buf, "/packed-refs");
 236
 237         args[2] = buf.buf;
 238
 239         if (run_command(&rsync))
 240                 die ("Could not run rsync to get refs");
 241
 242         /* read the copied refs */
 243
 244         strbuf_addstr(&temp_dir, "/refs");
 245         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 246         strbuf_setlen(&temp_dir, temp_dir_len);
 247
 248         tail = &dummy;
 249         strbuf_addstr(&temp_dir, "/packed-refs");
 250         insert_packed_refs(temp_dir.buf, &tail);
 251         strbuf_setlen(&temp_dir, temp_dir_len);
 252
 253         if (remove_dir_recursively(&temp_dir, 0))
 254                 warning ("Error removing temporary directory %s.",
 255                                 temp_dir.buf);
 256
 257         strbuf_release(&buf);
 258         strbuf_release(&temp_dir);
 259
 260         return dummy.next;
 261 }
 262
 263 static int fetch_objs_via_rsync(struct transport *transport,
 264                                 int nr_objs, struct ref **to_fetch)
 265 {
 266         struct strbuf buf = STRBUF_INIT;
 267         struct child_process rsync;
 268         const char *args[8];
 269         int result;
 270
 271         strbuf_addstr(&buf, rsync_url(transport->url));
 272         strbuf_addstr(&buf, "/objects/");
 273
 274         memset(&rsync, 0, sizeof(rsync));
 275         rsync.argv = args;
 276         rsync.stdout_to_stderr = 1;
 277         args[0] = "rsync";
 278         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 279         args[2] = "--ignore-existing";
 280         args[3] = "--exclude";
 281         args[4] = "info";
 282         args[5] = buf.buf;
 283         args[6] = get_object_directory();
 284         args[7] = NULL;
 285
 286         /* NEEDSWORK: handle one level of alternates */
 287         result = run_command(&rsync);
 288
 289         strbuf_release(&buf);
 290
 291         return result;
 292 }
 293
 294 static int write_one_ref(const char *name, const unsigned char *sha1,
 295                 int flags, void *data)
 296 {
 297         struct strbuf *buf = data;
 298         int len = buf->len;
 299         FILE *f;
 300
 301         /* when called via for_each_ref(), flags is non-zero */
 302         if (flags && !starts_with(name, "refs/heads/") &&
 303                         !starts_with(name, "refs/tags/"))
 304                 return 0;
 305
 306         strbuf_addstr(buf, name);
 307         if (safe_create_leading_directories(buf->buf) ||
 308                         !(f = fopen(buf->buf, "w")) ||
 309                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 310                         fclose(f))
 311                 return error("problems writing temporary file %s", buf->buf);
 312         strbuf_setlen(buf, len);
 313         return 0;
 314 }
 315
 316 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 317                 int refspec_nr, const char **refspec)
 318 {
 319         int i;
 320
 321         for (i = 0; i < refspec_nr; i++) {
 322                 unsigned char sha1[20];
 323                 char *ref;
 324
 325                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 326                         return error("Could not get ref %s", refspec[i]);
 327
 328                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 329                         free(ref);
 330                         return -1;
 331                 }
 332                 free(ref);
 333         }
 334         return 0;
 335 }
 336
 337 static int rsync_transport_push(struct transport *transport,
 338                 int refspec_nr, const char **refspec, int flags)
 339 {
 340         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 341         int result = 0, i;
 342         struct child_process rsync;
 343         const char *args[10];
 344
 345         if (flags & TRANSPORT_PUSH_MIRROR)
 346                 return error("rsync transport does not support mirror mode");
 347
 348         /* first push the objects */
 349
 350         strbuf_addstr(&buf, rsync_url(transport->url));
 351         strbuf_addch(&buf, '/');
 352
 353         memset(&rsync, 0, sizeof(rsync));
 354         rsync.argv = args;
 355         rsync.stdout_to_stderr = 1;
 356         i = 0;
 357         args[i++] = "rsync";
 358         args[i++] = "-a";
 359         if (flags & TRANSPORT_PUSH_DRY_RUN)
 360                 args[i++] = "--dry-run";
 361         if (transport->verbose > 1)
 362                 args[i++] = "-v";
 363         args[i++] = "--ignore-existing";
 364         args[i++] = "--exclude";
 365         args[i++] = "info";
 366         args[i++] = get_object_directory();
 367         args[i++] = buf.buf;
 368         args[i++] = NULL;
 369
 370         if (run_command(&rsync))
 371                 return error("Could not push objects to %s",
 372                                 rsync_url(transport->url));
 373
 374         /* copy the refs to the temporary directory; they could be packed. */
 375
 376         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 377         if (!mkdtemp(temp_dir.buf))
 378                 die_errno ("Could not make temporary directory");
 379         strbuf_addch(&temp_dir, '/');
 380
 381         if (flags & TRANSPORT_PUSH_ALL) {
 382                 if (for_each_ref(write_one_ref, &temp_dir))
 383                         return -1;
 384         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 385                 return -1;
 386
 387         i = 2;
 388         if (flags & TRANSPORT_PUSH_DRY_RUN)
 389                 args[i++] = "--dry-run";
 390         if (!(flags & TRANSPORT_PUSH_FORCE))
 391                 args[i++] = "--ignore-existing";
 392         args[i++] = temp_dir.buf;
 393         args[i++] = rsync_url(transport->url);
 394         args[i++] = NULL;
 395         if (run_command(&rsync))
 396                 result = error("Could not push to %s",
 397                                 rsync_url(transport->url));
 398
 399         if (remove_dir_recursively(&temp_dir, 0))
 400                 warning ("Could not remove temporary directory %s.",
 401                                 temp_dir.buf);
 402
 403         strbuf_release(&buf);
 404         strbuf_release(&temp_dir);
 405
 406         return result;
 407 }
 408
 409 struct bundle_transport_data {
 410         int fd;
 411         struct bundle_header header;
 412 };
 413
 414 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 415 {
 416         struct bundle_transport_data *data = transport->data;
 417         struct ref *result = NULL;
 418         int i;
 419
 420         if (for_push)
 421                 return NULL;
 422
 423         if (data->fd > 0)
 424                 close(data->fd);
 425         data->fd = read_bundle_header(transport->url, &data->header);
 426         if (data->fd < 0)
 427                 die ("Could not read bundle '%s'.", transport->url);
 428         for (i = 0; i < data->header.references.nr; i++) {
 429                 struct ref_list_entry *e = data->header.references.list + i;
 430                 struct ref *ref = alloc_ref(e->name);
 431                 hashcpy(ref->old_sha1, e->sha1);
 432                 ref->next = result;
 433                 result = ref;
 434         }
 435         return result;
 436 }
 437
 438 static int fetch_refs_from_bundle(struct transport *transport,
 439                                int nr_heads, struct ref **to_fetch)
 440 {
 441         struct bundle_transport_data *data = transport->data;
 442         return unbundle(&data->header, data->fd,
 443                         transport->progress ? BUNDLE_VERBOSE : 0);
 444 }
 445
 446 static int close_bundle(struct transport *transport)
 447 {
 448         struct bundle_transport_data *data = transport->data;
 449         if (data->fd > 0)
 450                 close(data->fd);
 451         free(data);
 452         return 0;
 453 }
 454
 455 struct git_transport_data {
 456         struct git_transport_options options;
 457         struct child_process *conn;
 458         int fd[2];
 459         unsigned got_remote_heads : 1;
 460         struct sha1_array extra_have;
 461         struct sha1_array shallow;
 462 };
 463
 464 static int set_git_option(struct git_transport_options *opts,
 465                           const char *name, const char *value)
 466 {
 467         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 468                 opts->uploadpack = value;
 469                 return 0;
 470         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 471                 opts->receivepack = value;
 472                 return 0;
 473         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 474                 opts->thin = !!value;
 475                 return 0;
 476         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 477                 opts->followtags = !!value;
 478                 return 0;
 479         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 480                 opts->keep = !!value;
 481                 return 0;
 482         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 483                 opts->update_shallow = !!value;
 484                 return 0;
 485         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 486                 if (!value)
 487                         opts->depth = 0;
 488                 else {
 489                         char *end;
 490                         opts->depth = strtol(value, &end, 0);
 491                         if (*end)
 492                                 die("transport: invalid depth option '%s'", value);
 493                 }
 494                 return 0;
 495         }
 496         return 1;
 497 }
 498
 499 static int connect_setup(struct transport *transport, int for_push, int verbose)
 500 {
 501         struct git_transport_data *data = transport->data;
 502
 503         if (data->conn)
 504                 return 0;
 505
 506         data->conn = git_connect(data->fd, transport->url,
 507                                  for_push ? data->options.receivepack :
 508                                  data->options.uploadpack,
 509                                  verbose ? CONNECT_VERBOSE : 0);
 510
 511         return 0;
 512 }
 513
 514 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 515 {
 516         struct git_transport_data *data = transport->data;
 517         struct ref *refs;
 518
 519         connect_setup(transport, for_push, 0);
 520         get_remote_heads(data->fd[0], NULL, 0, &refs,
 521                          for_push ? REF_NORMAL : 0,
 522                          &data->extra_have,
 523                          &data->shallow);
 524         data->got_remote_heads = 1;
 525
 526         return refs;
 527 }
 528
 529 static int fetch_refs_via_pack(struct transport *transport,
 530                                int nr_heads, struct ref **to_fetch)
 531 {
 532         struct git_transport_data *data = transport->data;
 533         const struct ref *refs;
 534         char *dest = xstrdup(transport->url);
 535         struct fetch_pack_args args;
 536         struct ref *refs_tmp = NULL;
 537
 538         memset(&args, 0, sizeof(args));
 539         args.uploadpack = data->options.uploadpack;
 540         args.keep_pack = data->options.keep;
 541         args.lock_pack = 1;
 542         args.use_thin_pack = data->options.thin;
 543         args.include_tag = data->options.followtags;
 544         args.verbose = (transport->verbose > 1);
 545         args.quiet = (transport->verbose < 0);
 546         args.no_progress = !transport->progress;
 547         args.depth = data->options.depth;
 548         args.check_self_contained_and_connected =
 549                 data->options.check_self_contained_and_connected;
 550         args.cloning = transport->cloning;
 551         args.update_shallow = data->options.update_shallow;
 552
 553         if (!data->got_remote_heads) {
 554                 connect_setup(transport, 0, 0);
 555                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 556                                  NULL, &data->shallow);
 557                 data->got_remote_heads = 1;
 558         }
 559
 560         refs = fetch_pack(&args, data->fd, data->conn,
 561                           refs_tmp ? refs_tmp : transport->remote_refs,
 562                           dest, to_fetch, nr_heads, &data->shallow,
 563                           &transport->pack_lockfile);
 564         close(data->fd[0]);
 565         close(data->fd[1]);
 566         if (finish_connect(data->conn))
 567                 refs = NULL;
 568         data->conn = NULL;
 569         data->got_remote_heads = 0;
 570         data->options.self_contained_and_connected =
 571                 args.self_contained_and_connected;
 572
 573         free_refs(refs_tmp);
 574
 575         free(dest);
 576         return (refs ? 0 : -1);
 577 }
 578
 579 static int push_had_errors(struct ref *ref)
 580 {
 581         for (; ref; ref = ref->next) {
 582                 switch (ref->status) {
 583                 case REF_STATUS_NONE:
 584                 case REF_STATUS_UPTODATE:
 585                 case REF_STATUS_OK:
 586                         break;
 587                 default:
 588                         return 1;
 589                 }
 590         }
 591         return 0;
 592 }
 593
 594 int transport_refs_pushed(struct ref *ref)
 595 {
 596         for (; ref; ref = ref->next) {
 597                 switch(ref->status) {
 598                 case REF_STATUS_NONE:
 599                 case REF_STATUS_UPTODATE:
 600                         break;
 601                 default:
 602                         return 1;
 603                 }
 604         }
 605         return 0;
 606 }
 607
 608 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 609 {
 610         struct refspec rs;
 611
 612         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 613                 return;
 614
 615         rs.src = ref->name;
 616         rs.dst = NULL;
 617
 618         if (!remote_find_tracking(remote, &rs)) {
 619                 if (verbose)
 620                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 621                 if (ref->deletion) {
 622                         delete_ref(rs.dst, NULL, 0);
 623                 } else
 624                         update_ref("update by push", rs.dst,
 625                                         ref->new_sha1, NULL, 0, 0);
 626                 free(rs.dst);
 627         }
 628 }
 629
 630 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 631 {
 632         if (porcelain) {
 633                 if (from)
 634                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 635                 else
 636                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 637                 if (msg)
 638                         fprintf(stdout, "%s (%s)\n", summary, msg);
 639                 else
 640                         fprintf(stdout, "%s\n", summary);
 641         } else {
 642                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 643                 if (from)
 644                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 645                 else
 646                         fputs(prettify_refname(to->name), stderr);
 647                 if (msg) {
 648                         fputs(" (", stderr);
 649                         fputs(msg, stderr);
 650                         fputc(')', stderr);
 651                 }
 652                 fputc('\n', stderr);
 653         }
 654 }
 655
 656 static const char *status_abbrev(unsigned char sha1[20])
 657 {
 658         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 659 }
 660
 661 static void print_ok_ref_status(struct ref *ref, int porcelain)
 662 {
 663         if (ref->deletion)
 664                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 665         else if (is_null_sha1(ref->old_sha1))
 666                 print_ref_status('*',
 667                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 668                         "[new branch]"),
 669                         ref, ref->peer_ref, NULL, porcelain);
 670         else {
 671                 char quickref[84];
 672                 char type;
 673                 const char *msg;
 674
 675                 strcpy(quickref, status_abbrev(ref->old_sha1));
 676                 if (ref->forced_update) {
 677                         strcat(quickref, "...");
 678                         type = '+';
 679                         msg = "forced update";
 680                 } else {
 681                         strcat(quickref, "..");
 682                         type = ' ';
 683                         msg = NULL;
 684                 }
 685                 strcat(quickref, status_abbrev(ref->new_sha1));
 686
 687                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 688         }
 689 }
 690
 691 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 692 {
 693         if (!count)
 694                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 695
 696         switch(ref->status) {
 697         case REF_STATUS_NONE:
 698                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 699                 break;
 700         case REF_STATUS_REJECT_NODELETE:
 701                 print_ref_status('!', "[rejected]", ref, NULL,
 702                                                  "remote does not support deleting refs", porcelain);
 703                 break;
 704         case REF_STATUS_UPTODATE:
 705                 print_ref_status('=', "[up to date]", ref,
 706                                                  ref->peer_ref, NULL, porcelain);
 707                 break;
 708         case REF_STATUS_REJECT_NONFASTFORWARD:
 709                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 710                                                  "non-fast-forward", porcelain);
 711                 break;
 712         case REF_STATUS_REJECT_ALREADY_EXISTS:
 713                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 714                                                  "already exists", porcelain);
 715                 break;
 716         case REF_STATUS_REJECT_FETCH_FIRST:
 717                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 718                                                  "fetch first", porcelain);
 719                 break;
 720         case REF_STATUS_REJECT_NEEDS_FORCE:
 721                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 722                                                  "needs force", porcelain);
 723                 break;
 724         case REF_STATUS_REJECT_STALE:
 725                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 726                                                  "stale info", porcelain);
 727                 break;
 728         case REF_STATUS_REJECT_SHALLOW:
 729                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 730                                                  "new shallow roots not allowed", porcelain);
 731                 break;
 732         case REF_STATUS_REMOTE_REJECT:
 733                 print_ref_status('!', "[remote rejected]", ref,
 734                                                  ref->deletion ? NULL : ref->peer_ref,
 735                                                  ref->remote_status, porcelain);
 736                 break;
 737         case REF_STATUS_EXPECTING_REPORT:
 738                 print_ref_status('!', "[remote failure]", ref,
 739                                                  ref->deletion ? NULL : ref->peer_ref,
 740                                                  "remote failed to report status", porcelain);
 741                 break;
 742         case REF_STATUS_OK:
 743                 print_ok_ref_status(ref, porcelain);
 744                 break;
 745         }
 746
 747         return 1;
 748 }
 749
 750 void transport_print_push_status(const char *dest, struct ref *refs,
 751                                   int verbose, int porcelain, unsigned int *reject_reasons)
 752 {
 753         struct ref *ref;
 754         int n = 0;
 755         unsigned char head_sha1[20];
 756         char *head;
 757
 758         head = resolve_refdup("HEAD", head_sha1, 1, NULL);
 759
 760         if (verbose) {
 761                 for (ref = refs; ref; ref = ref->next)
 762                         if (ref->status == REF_STATUS_UPTODATE)
 763                                 n += print_one_push_status(ref, dest, n, porcelain);
 764         }
 765
 766         for (ref = refs; ref; ref = ref->next)
 767                 if (ref->status == REF_STATUS_OK)
 768                         n += print_one_push_status(ref, dest, n, porcelain);
 769
 770         *reject_reasons = 0;
 771         for (ref = refs; ref; ref = ref->next) {
 772                 if (ref->status != REF_STATUS_NONE &&
 773                     ref->status != REF_STATUS_UPTODATE &&
 774                     ref->status != REF_STATUS_OK)
 775                         n += print_one_push_status(ref, dest, n, porcelain);
 776                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 777                         if (head != NULL && !strcmp(head, ref->name))
 778                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 779                         else
 780                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 781                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 782                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 783                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 784                         *reject_reasons |= REJECT_FETCH_FIRST;
 785                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 786                         *reject_reasons |= REJECT_NEEDS_FORCE;
 787                 }
 788         }
 789 }
 790
 791 void transport_verify_remote_names(int nr_heads, const char **heads)
 792 {
 793         int i;
 794
 795         for (i = 0; i < nr_heads; i++) {
 796                 const char *local = heads[i];
 797                 const char *remote = strrchr(heads[i], ':');
 798
 799                 if (*local == '+')
 800                         local++;
 801
 802                 /* A matching refspec is okay.  */
 803                 if (remote == local && remote[1] == '\0')
 804                         continue;
 805
 806                 remote = remote ? (remote + 1) : local;
 807                 if (check_refname_format(remote,
 808                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 809                         die("remote part of refspec is not a valid name in %s",
 810                                 heads[i]);
 811         }
 812 }
 813
 814 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 815 {
 816         struct git_transport_data *data = transport->data;
 817         struct send_pack_args args;
 818         int ret;
 819
 820         if (!data->got_remote_heads) {
 821                 struct ref *tmp_refs;
 822                 connect_setup(transport, 1, 0);
 823
 824                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 825                                  NULL, &data->shallow);
 826                 data->got_remote_heads = 1;
 827         }
 828
 829         memset(&args, 0, sizeof(args));
 830         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 831         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 832         args.use_thin_pack = data->options.thin;
 833         args.verbose = (transport->verbose > 0);
 834         args.quiet = (transport->verbose < 0);
 835         args.progress = transport->progress;
 836         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 837         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 838
 839         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 840                         &data->extra_have);
 841
 842         close(data->fd[1]);
 843         close(data->fd[0]);
 844         ret |= finish_connect(data->conn);
 845         data->conn = NULL;
 846         data->got_remote_heads = 0;
 847
 848         return ret;
 849 }
 850
 851 static int connect_git(struct transport *transport, const char *name,
 852                        const char *executable, int fd[2])
 853 {
 854         struct git_transport_data *data = transport->data;
 855         data->conn = git_connect(data->fd, transport->url,
 856                                  executable, 0);
 857         fd[0] = data->fd[0];
 858         fd[1] = data->fd[1];
 859         return 0;
 860 }
 861
 862 static int disconnect_git(struct transport *transport)
 863 {
 864         struct git_transport_data *data = transport->data;
 865         if (data->conn) {
 866                 if (data->got_remote_heads)
 867                         packet_flush(data->fd[1]);
 868                 close(data->fd[0]);
 869                 close(data->fd[1]);
 870                 finish_connect(data->conn);
 871         }
 872
 873         free(data);
 874         return 0;
 875 }
 876
 877 void transport_take_over(struct transport *transport,
 878                          struct child_process *child)
 879 {
 880         struct git_transport_data *data;
 881
 882         if (!transport->smart_options)
 883                 die("Bug detected: Taking over transport requires non-NULL "
 884                     "smart_options field.");
 885
 886         data = xcalloc(1, sizeof(*data));
 887         data->options = *transport->smart_options;
 888         data->conn = child;
 889         data->fd[0] = data->conn->out;
 890         data->fd[1] = data->conn->in;
 891         data->got_remote_heads = 0;
 892         transport->data = data;
 893
 894         transport->set_option = NULL;
 895         transport->get_refs_list = get_refs_via_connect;
 896         transport->fetch = fetch_refs_via_pack;
 897         transport->push = NULL;
 898         transport->push_refs = git_transport_push;
 899         transport->disconnect = disconnect_git;
 900         transport->smart_options = &(data->options);
 901
 902         transport->cannot_reuse = 1;
 903 }
 904
 905 static int is_file(const char *url)
 906 {
 907         struct stat buf;
 908         if (stat(url, &buf))
 909                 return 0;
 910         return S_ISREG(buf.st_mode);
 911 }
 912
 913 static int external_specification_len(const char *url)
 914 {
 915         return strchr(url, ':') - url;
 916 }
 917
 918 struct transport *transport_get(struct remote *remote, const char *url)
 919 {
 920         const char *helper;
 921         struct transport *ret = xcalloc(1, sizeof(*ret));
 922
 923         ret->progress = isatty(2);
 924
 925         if (!remote)
 926                 die("No remote provided to transport_get()");
 927
 928         ret->got_remote_refs = 0;
 929         ret->remote = remote;
 930         helper = remote->foreign_vcs;
 931
 932         if (!url && remote->url)
 933                 url = remote->url[0];
 934         ret->url = url;
 935
 936         /* maybe it is a foreign URL? */
 937         if (url) {
 938                 const char *p = url;
 939
 940                 while (is_urlschemechar(p == url, *p))
 941                         p++;
 942                 if (starts_with(p, "::"))
 943                         helper = xstrndup(url, p - url);
 944         }
 945
 946         if (helper) {
 947                 transport_helper_init(ret, helper);
 948         } else if (starts_with(url, "rsync:")) {
 949                 ret->get_refs_list = get_refs_via_rsync;
 950                 ret->fetch = fetch_objs_via_rsync;
 951                 ret->push = rsync_transport_push;
 952                 ret->smart_options = NULL;
 953         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 954                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 955                 ret->data = data;
 956                 ret->get_refs_list = get_refs_from_bundle;
 957                 ret->fetch = fetch_refs_from_bundle;
 958                 ret->disconnect = close_bundle;
 959                 ret->smart_options = NULL;
 960         } else if (!is_url(url)
 961                 || starts_with(url, "file://")
 962                 || starts_with(url, "git://")
 963                 || starts_with(url, "ssh://")
 964                 || starts_with(url, "git+ssh://")
 965                 || starts_with(url, "ssh+git://")) {
 966                 /* These are builtin smart transports. */
 967                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 968                 ret->data = data;
 969                 ret->set_option = NULL;
 970                 ret->get_refs_list = get_refs_via_connect;
 971                 ret->fetch = fetch_refs_via_pack;
 972                 ret->push_refs = git_transport_push;
 973                 ret->connect = connect_git;
 974                 ret->disconnect = disconnect_git;
 975                 ret->smart_options = &(data->options);
 976
 977                 data->conn = NULL;
 978                 data->got_remote_heads = 0;
 979         } else {
 980                 /* Unknown protocol in URL. Pass to external handler. */
 981                 int len = external_specification_len(url);
 982                 char *handler = xmalloc(len + 1);
 983                 handler[len] = 0;
 984                 strncpy(handler, url, len);
 985                 transport_helper_init(ret, handler);
 986         }
 987
 988         if (ret->smart_options) {
 989                 ret->smart_options->thin = 1;
 990                 ret->smart_options->uploadpack = "git-upload-pack";
 991                 if (remote->uploadpack)
 992                         ret->smart_options->uploadpack = remote->uploadpack;
 993                 ret->smart_options->receivepack = "git-receive-pack";
 994                 if (remote->receivepack)
 995                         ret->smart_options->receivepack = remote->receivepack;
 996         }
 997
 998         return ret;
 999 }
1000
1001 int transport_set_option(struct transport *transport,
1002                          const char *name, const char *value)
1003 {
1004         int git_reports = 1, protocol_reports = 1;
1005
1006         if (transport->smart_options)
1007                 git_reports = set_git_option(transport->smart_options,
1008                                              name, value);
1009
1010         if (transport->set_option)
1011                 protocol_reports = transport->set_option(transport, name,
1012                                                         value);
1013
1014         /* If either report is 0, report 0 (success). */
1015         if (!git_reports || !protocol_reports)
1016                 return 0;
1017         /* If either reports -1 (invalid value), report -1. */
1018         if ((git_reports == -1) || (protocol_reports == -1))
1019                 return -1;
1020         /* Otherwise if both report unknown, report unknown. */
1021         return 1;
1022 }
1023
1024 void transport_set_verbosity(struct transport *transport, int verbosity,
1025         int force_progress)
1026 {
1027         if (verbosity >= 1)
1028                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1029         if (verbosity < 0)
1030                 transport->verbose = -1;
1031
1032         /**
1033          * Rules used to determine whether to report progress (processing aborts
1034          * when a rule is satisfied):
1035          *
1036          *   . Report progress, if force_progress is 1 (ie. --progress).
1037          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1038          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1039          *   . Report progress if isatty(2) is 1.
1040          **/
1041         if (force_progress >= 0)
1042                 transport->progress = !!force_progress;
1043         else
1044                 transport->progress = verbosity >= 0 && isatty(2);
1045 }
1046
1047 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1048 {
1049         int i;
1050
1051         fprintf(stderr, "The following submodule paths contain changes that can\n"
1052                         "not be found on any remote:\n");
1053         for (i = 0; i < needs_pushing->nr; i++)
1054                 printf("  %s\n", needs_pushing->items[i].string);
1055         fprintf(stderr, "\nPlease try\n\n"
1056                         "       git push --recurse-submodules=on-demand\n\n"
1057                         "or cd to the path and use\n\n"
1058                         "       git push\n\n"
1059                         "to push them to a remote.\n\n");
1060
1061         string_list_clear(needs_pushing, 0);
1062
1063         die("Aborting.");
1064 }
1065
1066 static int run_pre_push_hook(struct transport *transport,
1067                              struct ref *remote_refs)
1068 {
1069         int ret = 0, x;
1070         struct ref *r;
1071         struct child_process proc;
1072         struct strbuf buf;
1073         const char *argv[4];
1074
1075         if (!(argv[0] = find_hook("pre-push")))
1076                 return 0;
1077
1078         argv[1] = transport->remote->name;
1079         argv[2] = transport->url;
1080         argv[3] = NULL;
1081
1082         memset(&proc, 0, sizeof(proc));
1083         proc.argv = argv;
1084         proc.in = -1;
1085
1086         if (start_command(&proc)) {
1087                 finish_command(&proc);
1088                 return -1;
1089         }
1090
1091         strbuf_init(&buf, 256);
1092
1093         for (r = remote_refs; r; r = r->next) {
1094                 if (!r->peer_ref) continue;
1095                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1096                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1097                 if (r->status == REF_STATUS_UPTODATE) continue;
1098
1099                 strbuf_reset(&buf);
1100                 strbuf_addf( &buf, "%s %s %s %s\n",
1101                          r->peer_ref->name, sha1_to_hex(r->new_sha1),
1102                          r->name, sha1_to_hex(r->old_sha1));
1103
1104                 if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1105                         ret = -1;
1106                         break;
1107                 }
1108         }
1109
1110         strbuf_release(&buf);
1111
1112         x = close(proc.in);
1113         if (!ret)
1114                 ret = x;
1115
1116         x = finish_command(&proc);
1117         if (!ret)
1118                 ret = x;
1119
1120         return ret;
1121 }
1122
1123 int transport_push(struct transport *transport,
1124                    int refspec_nr, const char **refspec, int flags,
1125                    unsigned int *reject_reasons)
1126 {
1127         *reject_reasons = 0;
1128         transport_verify_remote_names(refspec_nr, refspec);
1129
1130         if (transport->push) {
1131                 /* Maybe FIXME. But no important transport uses this case. */
1132                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1133                         die("This transport does not support using --set-upstream");
1134
1135                 return transport->push(transport, refspec_nr, refspec, flags);
1136         } else if (transport->push_refs) {
1137                 struct ref *remote_refs;
1138                 struct ref *local_refs = get_local_heads();
1139                 int match_flags = MATCH_REFS_NONE;
1140                 int verbose = (transport->verbose > 0);
1141                 int quiet = (transport->verbose < 0);
1142                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1143                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1144                 int push_ret, ret, err;
1145
1146                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1147                         return -1;
1148
1149                 remote_refs = transport->get_refs_list(transport, 1);
1150
1151                 if (flags & TRANSPORT_PUSH_ALL)
1152                         match_flags |= MATCH_REFS_ALL;
1153                 if (flags & TRANSPORT_PUSH_MIRROR)
1154                         match_flags |= MATCH_REFS_MIRROR;
1155                 if (flags & TRANSPORT_PUSH_PRUNE)
1156                         match_flags |= MATCH_REFS_PRUNE;
1157                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1158                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1159
1160                 if (match_push_refs(local_refs, &remote_refs,
1161                                     refspec_nr, refspec, match_flags)) {
1162                         return -1;
1163                 }
1164
1165                 if (transport->smart_options &&
1166                     transport->smart_options->cas &&
1167                     !is_empty_cas(transport->smart_options->cas))
1168                         apply_push_cas(transport->smart_options->cas,
1169                                        transport->remote, remote_refs);
1170
1171                 set_ref_status_for_push(remote_refs,
1172                         flags & TRANSPORT_PUSH_MIRROR,
1173                         flags & TRANSPORT_PUSH_FORCE);
1174
1175                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1176                         if (run_pre_push_hook(transport, remote_refs))
1177                                 return -1;
1178
1179                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1180                         struct ref *ref = remote_refs;
1181                         for (; ref; ref = ref->next)
1182                                 if (!is_null_sha1(ref->new_sha1) &&
1183                                     !push_unpushed_submodules(ref->new_sha1,
1184                                             transport->remote->name))
1185                                     die ("Failed to push all needed submodules!");
1186                 }
1187
1188                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1189                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1190                         struct ref *ref = remote_refs;
1191                         struct string_list needs_pushing;
1192
1193                         memset(&needs_pushing, 0, sizeof(struct string_list));
1194                         needs_pushing.strdup_strings = 1;
1195                         for (; ref; ref = ref->next)
1196                                 if (!is_null_sha1(ref->new_sha1) &&
1197                                     find_unpushed_submodules(ref->new_sha1,
1198                                             transport->remote->name, &needs_pushing))
1199                                         die_with_unpushed_submodules(&needs_pushing);
1200                 }
1201
1202                 push_ret = transport->push_refs(transport, remote_refs, flags);
1203                 err = push_had_errors(remote_refs);
1204                 ret = push_ret | err;
1205
1206                 if (!quiet || err)
1207                         transport_print_push_status(transport->url, remote_refs,
1208                                         verbose | porcelain, porcelain,
1209                                         reject_reasons);
1210
1211                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1212                         set_upstreams(transport, remote_refs, pretend);
1213
1214                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1215                         struct ref *ref;
1216                         for (ref = remote_refs; ref; ref = ref->next)
1217                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1218                 }
1219
1220                 if (porcelain && !push_ret)
1221                         puts("Done");
1222                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1223                         fprintf(stderr, "Everything up-to-date\n");
1224
1225                 return ret;
1226         }
1227         return 1;
1228 }
1229
1230 const struct ref *transport_get_remote_refs(struct transport *transport)
1231 {
1232         if (!transport->got_remote_refs) {
1233                 transport->remote_refs = transport->get_refs_list(transport, 0);
1234                 transport->got_remote_refs = 1;
1235         }
1236
1237         return transport->remote_refs;
1238 }
1239
1240 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1241 {
1242         int rc;
1243         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1244         struct ref **heads = NULL;
1245         struct ref *rm;
1246
1247         for (rm = refs; rm; rm = rm->next) {
1248                 nr_refs++;
1249                 if (rm->peer_ref &&
1250                     !is_null_sha1(rm->old_sha1) &&
1251                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1252                         continue;
1253                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1254                 heads[nr_heads++] = rm;
1255         }
1256
1257         if (!nr_heads) {
1258                 /*
1259                  * When deepening of a shallow repository is requested,
1260                  * then local and remote refs are likely to still be equal.
1261                  * Just feed them all to the fetch method in that case.
1262                  * This condition shouldn't be met in a non-deepening fetch
1263                  * (see builtin/fetch.c:quickfetch()).
1264                  */
1265                 heads = xmalloc(nr_refs * sizeof(*heads));
1266                 for (rm = refs; rm; rm = rm->next)
1267                         heads[nr_heads++] = rm;
1268         }
1269
1270         rc = transport->fetch(transport, nr_heads, heads);
1271
1272         free(heads);
1273         return rc;
1274 }
1275
1276 void transport_unlock_pack(struct transport *transport)
1277 {
1278         if (transport->pack_lockfile) {
1279                 unlink_or_warn(transport->pack_lockfile);
1280                 free(transport->pack_lockfile);
1281                 transport->pack_lockfile = NULL;
1282         }
1283 }
1284
1285 int transport_connect(struct transport *transport, const char *name,
1286                       const char *exec, int fd[2])
1287 {
1288         if (transport->connect)
1289                 return transport->connect(transport, name, exec, fd);
1290         else
1291                 die("Operation not supported by protocol");
1292 }
1293
1294 int transport_disconnect(struct transport *transport)
1295 {
1296         int ret = 0;
1297         if (transport->disconnect)
1298                 ret = transport->disconnect(transport);
1299         free(transport);
1300         return ret;
1301 }
1302
1303 /*
1304  * Strip username (and password) from a URL and return
1305  * it in a newly allocated string.
1306  */
1307 char *transport_anonymize_url(const char *url)
1308 {
1309         char *anon_url, *scheme_prefix, *anon_part;
1310         size_t anon_len, prefix_len = 0;
1311
1312         anon_part = strchr(url, '@');
1313         if (url_is_local_not_ssh(url) || !anon_part)
1314                 goto literal_copy;
1315
1316         anon_len = strlen(++anon_part);
1317         scheme_prefix = strstr(url, "://");
1318         if (!scheme_prefix) {
1319                 if (!strchr(anon_part, ':'))
1320                         /* cannot be "me@there:/path/name" */
1321                         goto literal_copy;
1322         } else {
1323                 const char *cp;
1324                 /* make sure scheme is reasonable */
1325                 for (cp = url; cp < scheme_prefix; cp++) {
1326                         switch (*cp) {
1327                                 /* RFC 1738 2.1 */
1328                         case '+': case '.': case '-':
1329                                 break; /* ok */
1330                         default:
1331                                 if (isalnum(*cp))
1332                                         break;
1333                                 /* it isn't */
1334                                 goto literal_copy;
1335                         }
1336                 }
1337                 /* @ past the first slash does not count */
1338                 cp = strchr(scheme_prefix + 3, '/');
1339                 if (cp && cp < anon_part)
1340                         goto literal_copy;
1341                 prefix_len = scheme_prefix - url + 3;
1342         }
1343         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1344         memcpy(anon_url, url, prefix_len);
1345         memcpy(anon_url + prefix_len, anon_part, anon_len);
1346         return anon_url;
1347 literal_copy:
1348         return xstrdup(url);
1349 }
1350
1351 struct alternate_refs_data {
1352         alternate_ref_fn *fn;
1353         void *data;
1354 };
1355
1356 static int refs_from_alternate_cb(struct alternate_object_database *e,
1357                                   void *data)
1358 {
1359         char *other;
1360         size_t len;
1361         struct remote *remote;
1362         struct transport *transport;
1363         const struct ref *extra;
1364         struct alternate_refs_data *cb = data;
1365
1366         e->name[-1] = '\0';
1367         other = xstrdup(real_path(e->base));
1368         e->name[-1] = '/';
1369         len = strlen(other);
1370
1371         while (other[len-1] == '/')
1372                 other[--len] = '\0';
1373         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1374                 return 0;
1375         /* Is this a git repository with refs? */
1376         memcpy(other + len - 8, "/refs", 6);
1377         if (!is_directory(other))
1378                 return 0;
1379         other[len - 8] = '\0';
1380         remote = remote_get(other);
1381         transport = transport_get(remote, other);
1382         for (extra = transport_get_remote_refs(transport);
1383              extra;
1384              extra = extra->next)
1385                 cb->fn(extra, cb->data);
1386         transport_disconnect(transport);
1387         free(other);
1388         return 0;
1389 }
1390
1391 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1392 {
1393         struct alternate_refs_data cb;
1394         cb.fn = fn;
1395         cb.data = data;
1396         foreach_alt_odb(refs_from_alternate_cb, &cb);
1397 }