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