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 (!isxdigit(buffer[0]))
 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, RESOLVE_REF_READING,
 172                                          sha, &flag);
 173                 if (tmp && flag & REF_ISSYMREF &&
 174                         starts_with(tmp, "refs/heads/"))
 175                         localname = tmp;
 176
 177                 /* Both source and destination must be local branches. */
 178                 if (!localname || !starts_with(localname, "refs/heads/"))
 179                         continue;
 180                 if (!remotename || !starts_with(remotename, "refs/heads/"))
 181                         continue;
 182
 183                 if (!pretend)
 184                         install_branch_config(BRANCH_CONFIG_VERBOSE,
 185                                 localname + 11, transport->remote->name,
 186                                 remotename);
 187                 else
 188                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
 189                                 localname + 11, remotename + 11,
 190                                 transport->remote->name);
 191         }
 192 }
 193
 194 static const char *rsync_url(const char *url)
 195 {
 196         if (!starts_with(url, "rsync://"))
 197                 skip_prefix(url, "rsync:", &url);
 198         return url;
 199 }
 200
 201 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 202 {
 203         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 204         struct ref dummy = {NULL}, *tail = &dummy;
 205         struct child_process rsync = CHILD_PROCESS_INIT;
 206         const char *args[5];
 207         int temp_dir_len;
 208
 209         if (for_push)
 210                 return NULL;
 211
 212         /* copy the refs to the temporary directory */
 213
 214         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 215         if (!mkdtemp(temp_dir.buf))
 216                 die_errno ("Could not make temporary directory");
 217         temp_dir_len = temp_dir.len;
 218
 219         strbuf_addstr(&buf, rsync_url(transport->url));
 220         strbuf_addstr(&buf, "/refs");
 221
 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 = CHILD_PROCESS_INIT;
 267
 268         rsync.stdout_to_stderr = 1;
 269         argv_array_push(&rsync.args, "rsync");
 270         argv_array_push(&rsync.args, (transport->verbose > 1) ? "-rv" : "-r");
 271         argv_array_push(&rsync.args, "--ignore-existing");
 272         argv_array_push(&rsync.args, "--exclude");
 273         argv_array_push(&rsync.args, "info");
 274         argv_array_pushf(&rsync.args, "%s/objects/", rsync_url(transport->url));
 275         argv_array_push(&rsync.args, get_object_directory());
 276
 277         /* NEEDSWORK: handle one level of alternates */
 278         return run_command(&rsync);
 279 }
 280
 281 static int write_one_ref(const char *name, const unsigned char *sha1,
 282                 int flags, void *data)
 283 {
 284         struct strbuf *buf = data;
 285         int len = buf->len;
 286         FILE *f;
 287
 288         /* when called via for_each_ref(), flags is non-zero */
 289         if (flags && !starts_with(name, "refs/heads/") &&
 290                         !starts_with(name, "refs/tags/"))
 291                 return 0;
 292
 293         strbuf_addstr(buf, name);
 294         if (safe_create_leading_directories(buf->buf) ||
 295                         !(f = fopen(buf->buf, "w")) ||
 296                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 297                         fclose(f))
 298                 return error("problems writing temporary file %s", buf->buf);
 299         strbuf_setlen(buf, len);
 300         return 0;
 301 }
 302
 303 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 304                 int refspec_nr, const char **refspec)
 305 {
 306         int i;
 307
 308         for (i = 0; i < refspec_nr; i++) {
 309                 unsigned char sha1[20];
 310                 char *ref;
 311
 312                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 313                         return error("Could not get ref %s", refspec[i]);
 314
 315                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 316                         free(ref);
 317                         return -1;
 318                 }
 319                 free(ref);
 320         }
 321         return 0;
 322 }
 323
 324 static int rsync_transport_push(struct transport *transport,
 325                 int refspec_nr, const char **refspec, int flags)
 326 {
 327         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 328         int result = 0, i;
 329         struct child_process rsync = CHILD_PROCESS_INIT;
 330         const char *args[10];
 331
 332         if (flags & TRANSPORT_PUSH_MIRROR)
 333                 return error("rsync transport does not support mirror mode");
 334
 335         /* first push the objects */
 336
 337         strbuf_addstr(&buf, rsync_url(transport->url));
 338         strbuf_addch(&buf, '/');
 339
 340         rsync.argv = args;
 341         rsync.stdout_to_stderr = 1;
 342         i = 0;
 343         args[i++] = "rsync";
 344         args[i++] = "-a";
 345         if (flags & TRANSPORT_PUSH_DRY_RUN)
 346                 args[i++] = "--dry-run";
 347         if (transport->verbose > 1)
 348                 args[i++] = "-v";
 349         args[i++] = "--ignore-existing";
 350         args[i++] = "--exclude";
 351         args[i++] = "info";
 352         args[i++] = get_object_directory();
 353         args[i++] = buf.buf;
 354         args[i++] = NULL;
 355
 356         if (run_command(&rsync))
 357                 return error("Could not push objects to %s",
 358                                 rsync_url(transport->url));
 359
 360         /* copy the refs to the temporary directory; they could be packed. */
 361
 362         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 363         if (!mkdtemp(temp_dir.buf))
 364                 die_errno ("Could not make temporary directory");
 365         strbuf_addch(&temp_dir, '/');
 366
 367         if (flags & TRANSPORT_PUSH_ALL) {
 368                 if (for_each_ref(write_one_ref, &temp_dir))
 369                         return -1;
 370         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 371                 return -1;
 372
 373         i = 2;
 374         if (flags & TRANSPORT_PUSH_DRY_RUN)
 375                 args[i++] = "--dry-run";
 376         if (!(flags & TRANSPORT_PUSH_FORCE))
 377                 args[i++] = "--ignore-existing";
 378         args[i++] = temp_dir.buf;
 379         args[i++] = rsync_url(transport->url);
 380         args[i++] = NULL;
 381         if (run_command(&rsync))
 382                 result = error("Could not push to %s",
 383                                 rsync_url(transport->url));
 384
 385         if (remove_dir_recursively(&temp_dir, 0))
 386                 warning ("Could not remove temporary directory %s.",
 387                                 temp_dir.buf);
 388
 389         strbuf_release(&buf);
 390         strbuf_release(&temp_dir);
 391
 392         return result;
 393 }
 394
 395 struct bundle_transport_data {
 396         int fd;
 397         struct bundle_header header;
 398 };
 399
 400 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 401 {
 402         struct bundle_transport_data *data = transport->data;
 403         struct ref *result = NULL;
 404         int i;
 405
 406         if (for_push)
 407                 return NULL;
 408
 409         if (data->fd > 0)
 410                 close(data->fd);
 411         data->fd = read_bundle_header(transport->url, &data->header);
 412         if (data->fd < 0)
 413                 die ("Could not read bundle '%s'.", transport->url);
 414         for (i = 0; i < data->header.references.nr; i++) {
 415                 struct ref_list_entry *e = data->header.references.list + i;
 416                 struct ref *ref = alloc_ref(e->name);
 417                 hashcpy(ref->old_sha1, e->sha1);
 418                 ref->next = result;
 419                 result = ref;
 420         }
 421         return result;
 422 }
 423
 424 static int fetch_refs_from_bundle(struct transport *transport,
 425                                int nr_heads, struct ref **to_fetch)
 426 {
 427         struct bundle_transport_data *data = transport->data;
 428         return unbundle(&data->header, data->fd,
 429                         transport->progress ? BUNDLE_VERBOSE : 0);
 430 }
 431
 432 static int close_bundle(struct transport *transport)
 433 {
 434         struct bundle_transport_data *data = transport->data;
 435         if (data->fd > 0)
 436                 close(data->fd);
 437         free(data);
 438         return 0;
 439 }
 440
 441 struct git_transport_data {
 442         struct git_transport_options options;
 443         struct child_process *conn;
 444         int fd[2];
 445         unsigned got_remote_heads : 1;
 446         struct sha1_array extra_have;
 447         struct sha1_array shallow;
 448 };
 449
 450 static int set_git_option(struct git_transport_options *opts,
 451                           const char *name, const char *value)
 452 {
 453         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 454                 opts->uploadpack = value;
 455                 return 0;
 456         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 457                 opts->receivepack = value;
 458                 return 0;
 459         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 460                 opts->thin = !!value;
 461                 return 0;
 462         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 463                 opts->followtags = !!value;
 464                 return 0;
 465         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 466                 opts->keep = !!value;
 467                 return 0;
 468         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 469                 opts->update_shallow = !!value;
 470                 return 0;
 471         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 472                 if (!value)
 473                         opts->depth = 0;
 474                 else {
 475                         char *end;
 476                         opts->depth = strtol(value, &end, 0);
 477                         if (*end)
 478                                 die("transport: invalid depth option '%s'", value);
 479                 }
 480                 return 0;
 481         } else if (!strcmp(name, TRANS_OPT_PUSH_CERT)) {
 482                 opts->push_cert = !!value;
 483                 return 0;
 484         }
 485         return 1;
 486 }
 487
 488 static int connect_setup(struct transport *transport, int for_push, int verbose)
 489 {
 490         struct git_transport_data *data = transport->data;
 491
 492         if (data->conn)
 493                 return 0;
 494
 495         data->conn = git_connect(data->fd, transport->url,
 496                                  for_push ? data->options.receivepack :
 497                                  data->options.uploadpack,
 498                                  verbose ? CONNECT_VERBOSE : 0);
 499
 500         return 0;
 501 }
 502
 503 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 504 {
 505         struct git_transport_data *data = transport->data;
 506         struct ref *refs;
 507
 508         connect_setup(transport, for_push, 0);
 509         get_remote_heads(data->fd[0], NULL, 0, &refs,
 510                          for_push ? REF_NORMAL : 0,
 511                          &data->extra_have,
 512                          &data->shallow);
 513         data->got_remote_heads = 1;
 514
 515         return refs;
 516 }
 517
 518 static int fetch_refs_via_pack(struct transport *transport,
 519                                int nr_heads, struct ref **to_fetch)
 520 {
 521         struct git_transport_data *data = transport->data;
 522         const struct ref *refs;
 523         char *dest = xstrdup(transport->url);
 524         struct fetch_pack_args args;
 525         struct ref *refs_tmp = NULL;
 526
 527         memset(&args, 0, sizeof(args));
 528         args.uploadpack = data->options.uploadpack;
 529         args.keep_pack = data->options.keep;
 530         args.lock_pack = 1;
 531         args.use_thin_pack = data->options.thin;
 532         args.include_tag = data->options.followtags;
 533         args.verbose = (transport->verbose > 1);
 534         args.quiet = (transport->verbose < 0);
 535         args.no_progress = !transport->progress;
 536         args.depth = data->options.depth;
 537         args.check_self_contained_and_connected =
 538                 data->options.check_self_contained_and_connected;
 539         args.cloning = transport->cloning;
 540         args.update_shallow = data->options.update_shallow;
 541
 542         if (!data->got_remote_heads) {
 543                 connect_setup(transport, 0, 0);
 544                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 545                                  NULL, &data->shallow);
 546                 data->got_remote_heads = 1;
 547         }
 548
 549         refs = fetch_pack(&args, data->fd, data->conn,
 550                           refs_tmp ? refs_tmp : transport->remote_refs,
 551                           dest, to_fetch, nr_heads, &data->shallow,
 552                           &transport->pack_lockfile);
 553         close(data->fd[0]);
 554         close(data->fd[1]);
 555         if (finish_connect(data->conn))
 556                 refs = NULL;
 557         data->conn = NULL;
 558         data->got_remote_heads = 0;
 559         data->options.self_contained_and_connected =
 560                 args.self_contained_and_connected;
 561
 562         free_refs(refs_tmp);
 563
 564         free(dest);
 565         return (refs ? 0 : -1);
 566 }
 567
 568 static int push_had_errors(struct ref *ref)
 569 {
 570         for (; ref; ref = ref->next) {
 571                 switch (ref->status) {
 572                 case REF_STATUS_NONE:
 573                 case REF_STATUS_UPTODATE:
 574                 case REF_STATUS_OK:
 575                         break;
 576                 default:
 577                         return 1;
 578                 }
 579         }
 580         return 0;
 581 }
 582
 583 int transport_refs_pushed(struct ref *ref)
 584 {
 585         for (; ref; ref = ref->next) {
 586                 switch(ref->status) {
 587                 case REF_STATUS_NONE:
 588                 case REF_STATUS_UPTODATE:
 589                         break;
 590                 default:
 591                         return 1;
 592                 }
 593         }
 594         return 0;
 595 }
 596
 597 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 598 {
 599         struct refspec rs;
 600
 601         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 602                 return;
 603
 604         rs.src = ref->name;
 605         rs.dst = NULL;
 606
 607         if (!remote_find_tracking(remote, &rs)) {
 608                 if (verbose)
 609                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 610                 if (ref->deletion) {
 611                         delete_ref(rs.dst, NULL, 0);
 612                 } else
 613                         update_ref("update by push", rs.dst,
 614                                         ref->new_sha1, NULL, 0, 0);
 615                 free(rs.dst);
 616         }
 617 }
 618
 619 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 620 {
 621         if (porcelain) {
 622                 if (from)
 623                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 624                 else
 625                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 626                 if (msg)
 627                         fprintf(stdout, "%s (%s)\n", summary, msg);
 628                 else
 629                         fprintf(stdout, "%s\n", summary);
 630         } else {
 631                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 632                 if (from)
 633                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 634                 else
 635                         fputs(prettify_refname(to->name), stderr);
 636                 if (msg) {
 637                         fputs(" (", stderr);
 638                         fputs(msg, stderr);
 639                         fputc(')', stderr);
 640                 }
 641                 fputc('\n', stderr);
 642         }
 643 }
 644
 645 static const char *status_abbrev(unsigned char sha1[20])
 646 {
 647         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 648 }
 649
 650 static void print_ok_ref_status(struct ref *ref, int porcelain)
 651 {
 652         if (ref->deletion)
 653                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 654         else if (is_null_sha1(ref->old_sha1))
 655                 print_ref_status('*',
 656                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 657                         "[new branch]"),
 658                         ref, ref->peer_ref, NULL, porcelain);
 659         else {
 660                 char quickref[84];
 661                 char type;
 662                 const char *msg;
 663
 664                 strcpy(quickref, status_abbrev(ref->old_sha1));
 665                 if (ref->forced_update) {
 666                         strcat(quickref, "...");
 667                         type = '+';
 668                         msg = "forced update";
 669                 } else {
 670                         strcat(quickref, "..");
 671                         type = ' ';
 672                         msg = NULL;
 673                 }
 674                 strcat(quickref, status_abbrev(ref->new_sha1));
 675
 676                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 677         }
 678 }
 679
 680 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 681 {
 682         if (!count)
 683                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 684
 685         switch(ref->status) {
 686         case REF_STATUS_NONE:
 687                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 688                 break;
 689         case REF_STATUS_REJECT_NODELETE:
 690                 print_ref_status('!', "[rejected]", ref, NULL,
 691                                                  "remote does not support deleting refs", porcelain);
 692                 break;
 693         case REF_STATUS_UPTODATE:
 694                 print_ref_status('=', "[up to date]", ref,
 695                                                  ref->peer_ref, NULL, porcelain);
 696                 break;
 697         case REF_STATUS_REJECT_NONFASTFORWARD:
 698                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 699                                                  "non-fast-forward", porcelain);
 700                 break;
 701         case REF_STATUS_REJECT_ALREADY_EXISTS:
 702                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 703                                                  "already exists", porcelain);
 704                 break;
 705         case REF_STATUS_REJECT_FETCH_FIRST:
 706                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 707                                                  "fetch first", porcelain);
 708                 break;
 709         case REF_STATUS_REJECT_NEEDS_FORCE:
 710                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 711                                                  "needs force", porcelain);
 712                 break;
 713         case REF_STATUS_REJECT_STALE:
 714                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 715                                                  "stale info", porcelain);
 716                 break;
 717         case REF_STATUS_REJECT_SHALLOW:
 718                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 719                                                  "new shallow roots not allowed", porcelain);
 720                 break;
 721         case REF_STATUS_REMOTE_REJECT:
 722                 print_ref_status('!', "[remote rejected]", ref,
 723                                                  ref->deletion ? NULL : ref->peer_ref,
 724                                                  ref->remote_status, porcelain);
 725                 break;
 726         case REF_STATUS_EXPECTING_REPORT:
 727                 print_ref_status('!', "[remote failure]", ref,
 728                                                  ref->deletion ? NULL : ref->peer_ref,
 729                                                  "remote failed to report status", porcelain);
 730                 break;
 731         case REF_STATUS_OK:
 732                 print_ok_ref_status(ref, porcelain);
 733                 break;
 734         }
 735
 736         return 1;
 737 }
 738
 739 void transport_print_push_status(const char *dest, struct ref *refs,
 740                                   int verbose, int porcelain, unsigned int *reject_reasons)
 741 {
 742         struct ref *ref;
 743         int n = 0;
 744         unsigned char head_sha1[20];
 745         char *head;
 746
 747         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 748
 749         if (verbose) {
 750                 for (ref = refs; ref; ref = ref->next)
 751                         if (ref->status == REF_STATUS_UPTODATE)
 752                                 n += print_one_push_status(ref, dest, n, porcelain);
 753         }
 754
 755         for (ref = refs; ref; ref = ref->next)
 756                 if (ref->status == REF_STATUS_OK)
 757                         n += print_one_push_status(ref, dest, n, porcelain);
 758
 759         *reject_reasons = 0;
 760         for (ref = refs; ref; ref = ref->next) {
 761                 if (ref->status != REF_STATUS_NONE &&
 762                     ref->status != REF_STATUS_UPTODATE &&
 763                     ref->status != REF_STATUS_OK)
 764                         n += print_one_push_status(ref, dest, n, porcelain);
 765                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 766                         if (head != NULL && !strcmp(head, ref->name))
 767                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 768                         else
 769                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 770                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 771                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 772                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 773                         *reject_reasons |= REJECT_FETCH_FIRST;
 774                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 775                         *reject_reasons |= REJECT_NEEDS_FORCE;
 776                 }
 777         }
 778         free(head);
 779 }
 780
 781 void transport_verify_remote_names(int nr_heads, const char **heads)
 782 {
 783         int i;
 784
 785         for (i = 0; i < nr_heads; i++) {
 786                 const char *local = heads[i];
 787                 const char *remote = strrchr(heads[i], ':');
 788
 789                 if (*local == '+')
 790                         local++;
 791
 792                 /* A matching refspec is okay.  */
 793                 if (remote == local && remote[1] == '\0')
 794                         continue;
 795
 796                 remote = remote ? (remote + 1) : local;
 797                 if (check_refname_format(remote,
 798                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 799                         die("remote part of refspec is not a valid name in %s",
 800                                 heads[i]);
 801         }
 802 }
 803
 804 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 805 {
 806         struct git_transport_data *data = transport->data;
 807         struct send_pack_args args;
 808         int ret;
 809
 810         if (!data->got_remote_heads) {
 811                 struct ref *tmp_refs;
 812                 connect_setup(transport, 1, 0);
 813
 814                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 815                                  NULL, &data->shallow);
 816                 data->got_remote_heads = 1;
 817         }
 818
 819         memset(&args, 0, sizeof(args));
 820         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 821         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 822         args.use_thin_pack = data->options.thin;
 823         args.verbose = (transport->verbose > 0);
 824         args.quiet = (transport->verbose < 0);
 825         args.progress = transport->progress;
 826         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 827         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 828         args.push_cert = !!(flags & TRANSPORT_PUSH_CERT);
 829         args.url = transport->url;
 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 = xmemdupz(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 }