git.oblomov.eu Git - git/blob - transport.c

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