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 (!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_tracking(struct transport *transport, struct ref *refs,
 147         int pretend, int publish)
 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                         if (publish)
 185                                 install_branch_publish(localname + 11,
 186                                                 transport->remote->name,
 187                                                 remotename);
 188                         else
 189                                 install_branch_config(BRANCH_CONFIG_VERBOSE,
 190                                                 localname + 11, transport->remote->name,
 191                                                 remotename);
 192                 } else
 193                         printf("Would set %s of '%s' to '%s' of '%s'\n",
 194                                 publish ? "publish" : "upstream",
 195                                 localname + 11, remotename + 11,
 196                                 transport->remote->name);
 197         }
 198 }
 199
 200 static const char *rsync_url(const char *url)
 201 {
 202         if (!starts_with(url, "rsync://"))
 203                 skip_prefix(url, "rsync:", &url);
 204         return url;
 205 }
 206
 207 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 208 {
 209         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 210         struct ref dummy = {NULL}, *tail = &dummy;
 211         struct child_process rsync = CHILD_PROCESS_INIT;
 212         const char *args[5];
 213         int temp_dir_len;
 214
 215         if (for_push)
 216                 return NULL;
 217
 218         /* copy the refs to the temporary directory */
 219
 220         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 221         if (!mkdtemp(temp_dir.buf))
 222                 die_errno ("Could not make temporary directory");
 223         temp_dir_len = temp_dir.len;
 224
 225         strbuf_addstr(&buf, rsync_url(transport->url));
 226         strbuf_addstr(&buf, "/refs");
 227
 228         rsync.argv = args;
 229         rsync.stdout_to_stderr = 1;
 230         args[0] = "rsync";
 231         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 232         args[2] = buf.buf;
 233         args[3] = temp_dir.buf;
 234         args[4] = NULL;
 235
 236         if (run_command(&rsync))
 237                 die ("Could not run rsync to get refs");
 238
 239         strbuf_reset(&buf);
 240         strbuf_addstr(&buf, rsync_url(transport->url));
 241         strbuf_addstr(&buf, "/packed-refs");
 242
 243         args[2] = buf.buf;
 244
 245         if (run_command(&rsync))
 246                 die ("Could not run rsync to get refs");
 247
 248         /* read the copied refs */
 249
 250         strbuf_addstr(&temp_dir, "/refs");
 251         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 252         strbuf_setlen(&temp_dir, temp_dir_len);
 253
 254         tail = &dummy;
 255         strbuf_addstr(&temp_dir, "/packed-refs");
 256         insert_packed_refs(temp_dir.buf, &tail);
 257         strbuf_setlen(&temp_dir, temp_dir_len);
 258
 259         if (remove_dir_recursively(&temp_dir, 0))
 260                 warning ("Error removing temporary directory %s.",
 261                                 temp_dir.buf);
 262
 263         strbuf_release(&buf);
 264         strbuf_release(&temp_dir);
 265
 266         return dummy.next;
 267 }
 268
 269 static int fetch_objs_via_rsync(struct transport *transport,
 270                                 int nr_objs, struct ref **to_fetch)
 271 {
 272         struct child_process rsync = CHILD_PROCESS_INIT;
 273
 274         rsync.stdout_to_stderr = 1;
 275         argv_array_push(&rsync.args, "rsync");
 276         argv_array_push(&rsync.args, (transport->verbose > 1) ? "-rv" : "-r");
 277         argv_array_push(&rsync.args, "--ignore-existing");
 278         argv_array_push(&rsync.args, "--exclude");
 279         argv_array_push(&rsync.args, "info");
 280         argv_array_pushf(&rsync.args, "%s/objects/", rsync_url(transport->url));
 281         argv_array_push(&rsync.args, get_object_directory());
 282
 283         /* NEEDSWORK: handle one level of alternates */
 284         return run_command(&rsync);
 285 }
 286
 287 static int write_one_ref(const char *name, const struct object_id *oid,
 288                          int flags, void *data)
 289 {
 290         struct strbuf *buf = data;
 291         int len = buf->len;
 292
 293         /* when called via for_each_ref(), flags is non-zero */
 294         if (flags && !starts_with(name, "refs/heads/") &&
 295                         !starts_with(name, "refs/tags/"))
 296                 return 0;
 297
 298         strbuf_addstr(buf, name);
 299         if (safe_create_leading_directories(buf->buf) ||
 300             write_file_gently(buf->buf, "%s", oid_to_hex(oid)))
 301                 return error("problems writing temporary file %s: %s",
 302                              buf->buf, strerror(errno));
 303         strbuf_setlen(buf, len);
 304         return 0;
 305 }
 306
 307 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 308                                   int refspec_nr, const char **refspec)
 309 {
 310         int i;
 311
 312         for (i = 0; i < refspec_nr; i++) {
 313                 struct object_id oid;
 314                 char *ref;
 315
 316                 if (dwim_ref(refspec[i], strlen(refspec[i]), oid.hash, &ref) != 1)
 317                         return error("Could not get ref %s", refspec[i]);
 318
 319                 if (write_one_ref(ref, &oid, 0, temp_dir)) {
 320                         free(ref);
 321                         return -1;
 322                 }
 323                 free(ref);
 324         }
 325         return 0;
 326 }
 327
 328 static int rsync_transport_push(struct transport *transport,
 329                 int refspec_nr, const char **refspec, int flags)
 330 {
 331         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 332         int result = 0, i;
 333         struct child_process rsync = CHILD_PROCESS_INIT;
 334         const char *args[10];
 335
 336         if (flags & TRANSPORT_PUSH_MIRROR)
 337                 return error("rsync transport does not support mirror mode");
 338
 339         /* first push the objects */
 340
 341         strbuf_addstr(&buf, rsync_url(transport->url));
 342         strbuf_addch(&buf, '/');
 343
 344         rsync.argv = args;
 345         rsync.stdout_to_stderr = 1;
 346         i = 0;
 347         args[i++] = "rsync";
 348         args[i++] = "-a";
 349         if (flags & TRANSPORT_PUSH_DRY_RUN)
 350                 args[i++] = "--dry-run";
 351         if (transport->verbose > 1)
 352                 args[i++] = "-v";
 353         args[i++] = "--ignore-existing";
 354         args[i++] = "--exclude";
 355         args[i++] = "info";
 356         args[i++] = get_object_directory();
 357         args[i++] = buf.buf;
 358         args[i++] = NULL;
 359
 360         if (run_command(&rsync))
 361                 return error("Could not push objects to %s",
 362                                 rsync_url(transport->url));
 363
 364         /* copy the refs to the temporary directory; they could be packed. */
 365
 366         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 367         if (!mkdtemp(temp_dir.buf))
 368                 die_errno ("Could not make temporary directory");
 369         strbuf_addch(&temp_dir, '/');
 370
 371         if (flags & TRANSPORT_PUSH_ALL) {
 372                 if (for_each_ref(write_one_ref, &temp_dir))
 373                         return -1;
 374         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 375                 return -1;
 376
 377         i = 2;
 378         if (flags & TRANSPORT_PUSH_DRY_RUN)
 379                 args[i++] = "--dry-run";
 380         if (!(flags & TRANSPORT_PUSH_FORCE))
 381                 args[i++] = "--ignore-existing";
 382         args[i++] = temp_dir.buf;
 383         args[i++] = rsync_url(transport->url);
 384         args[i++] = NULL;
 385         if (run_command(&rsync))
 386                 result = error("Could not push to %s",
 387                                 rsync_url(transport->url));
 388
 389         if (remove_dir_recursively(&temp_dir, 0))
 390                 warning ("Could not remove temporary directory %s.",
 391                                 temp_dir.buf);
 392
 393         strbuf_release(&buf);
 394         strbuf_release(&temp_dir);
 395
 396         return result;
 397 }
 398
 399 struct bundle_transport_data {
 400         int fd;
 401         struct bundle_header header;
 402 };
 403
 404 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 405 {
 406         struct bundle_transport_data *data = transport->data;
 407         struct ref *result = NULL;
 408         int i;
 409
 410         if (for_push)
 411                 return NULL;
 412
 413         if (data->fd > 0)
 414                 close(data->fd);
 415         data->fd = read_bundle_header(transport->url, &data->header);
 416         if (data->fd < 0)
 417                 die ("Could not read bundle '%s'.", transport->url);
 418         for (i = 0; i < data->header.references.nr; i++) {
 419                 struct ref_list_entry *e = data->header.references.list + i;
 420                 struct ref *ref = alloc_ref(e->name);
 421                 hashcpy(ref->old_sha1, e->sha1);
 422                 ref->next = result;
 423                 result = ref;
 424         }
 425         return result;
 426 }
 427
 428 static int fetch_refs_from_bundle(struct transport *transport,
 429                                int nr_heads, struct ref **to_fetch)
 430 {
 431         struct bundle_transport_data *data = transport->data;
 432         return unbundle(&data->header, data->fd,
 433                         transport->progress ? BUNDLE_VERBOSE : 0);
 434 }
 435
 436 static int close_bundle(struct transport *transport)
 437 {
 438         struct bundle_transport_data *data = transport->data;
 439         if (data->fd > 0)
 440                 close(data->fd);
 441         free(data);
 442         return 0;
 443 }
 444
 445 struct git_transport_data {
 446         struct git_transport_options options;
 447         struct child_process *conn;
 448         int fd[2];
 449         unsigned got_remote_heads : 1;
 450         struct sha1_array extra_have;
 451         struct sha1_array shallow;
 452 };
 453
 454 static int set_git_option(struct git_transport_options *opts,
 455                           const char *name, const char *value)
 456 {
 457         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 458                 opts->uploadpack = value;
 459                 return 0;
 460         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 461                 opts->receivepack = value;
 462                 return 0;
 463         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 464                 opts->thin = !!value;
 465                 return 0;
 466         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 467                 opts->followtags = !!value;
 468                 return 0;
 469         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 470                 opts->keep = !!value;
 471                 return 0;
 472         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 473                 opts->update_shallow = !!value;
 474                 return 0;
 475         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 476                 if (!value)
 477                         opts->depth = 0;
 478                 else {
 479                         char *end;
 480                         opts->depth = strtol(value, &end, 0);
 481                         if (*end)
 482                                 die("transport: invalid depth option '%s'", value);
 483                 }
 484                 return 0;
 485         }
 486         return 1;
 487 }
 488
 489 static int connect_setup(struct transport *transport, int for_push, int verbose)
 490 {
 491         struct git_transport_data *data = transport->data;
 492
 493         if (data->conn)
 494                 return 0;
 495
 496         data->conn = git_connect(data->fd, transport->url,
 497                                  for_push ? data->options.receivepack :
 498                                  data->options.uploadpack,
 499                                  verbose ? CONNECT_VERBOSE : 0);
 500
 501         return 0;
 502 }
 503
 504 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 505 {
 506         struct git_transport_data *data = transport->data;
 507         struct ref *refs;
 508
 509         connect_setup(transport, for_push, 0);
 510         get_remote_heads(data->fd[0], NULL, 0, &refs,
 511                          for_push ? REF_NORMAL : 0,
 512                          &data->extra_have,
 513                          &data->shallow);
 514         data->got_remote_heads = 1;
 515
 516         return refs;
 517 }
 518
 519 static int fetch_refs_via_pack(struct transport *transport,
 520                                int nr_heads, struct ref **to_fetch)
 521 {
 522         struct git_transport_data *data = transport->data;
 523         struct ref *refs;
 524         char *dest = xstrdup(transport->url);
 525         struct fetch_pack_args args;
 526         struct ref *refs_tmp = NULL;
 527
 528         memset(&args, 0, sizeof(args));
 529         args.uploadpack = data->options.uploadpack;
 530         args.keep_pack = data->options.keep;
 531         args.lock_pack = 1;
 532         args.use_thin_pack = data->options.thin;
 533         args.include_tag = data->options.followtags;
 534         args.verbose = (transport->verbose > 1);
 535         args.quiet = (transport->verbose < 0);
 536         args.no_progress = !transport->progress;
 537         args.depth = data->options.depth;
 538         args.check_self_contained_and_connected =
 539                 data->options.check_self_contained_and_connected;
 540         args.cloning = transport->cloning;
 541         args.update_shallow = data->options.update_shallow;
 542
 543         if (!data->got_remote_heads) {
 544                 connect_setup(transport, 0, 0);
 545                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 546                                  NULL, &data->shallow);
 547                 data->got_remote_heads = 1;
 548         }
 549
 550         refs = fetch_pack(&args, data->fd, data->conn,
 551                           refs_tmp ? refs_tmp : transport->remote_refs,
 552                           dest, to_fetch, nr_heads, &data->shallow,
 553                           &transport->pack_lockfile);
 554         close(data->fd[0]);
 555         close(data->fd[1]);
 556         if (finish_connect(data->conn)) {
 557                 free_refs(refs);
 558                 refs = NULL;
 559         }
 560         data->conn = NULL;
 561         data->got_remote_heads = 0;
 562         data->options.self_contained_and_connected =
 563                 args.self_contained_and_connected;
 564
 565         free_refs(refs_tmp);
 566         free_refs(refs);
 567         free(dest);
 568         return (refs ? 0 : -1);
 569 }
 570
 571 static int push_had_errors(struct ref *ref)
 572 {
 573         for (; ref; ref = ref->next) {
 574                 switch (ref->status) {
 575                 case REF_STATUS_NONE:
 576                 case REF_STATUS_UPTODATE:
 577                 case REF_STATUS_OK:
 578                         break;
 579                 default:
 580                         return 1;
 581                 }
 582         }
 583         return 0;
 584 }
 585
 586 int transport_refs_pushed(struct ref *ref)
 587 {
 588         for (; ref; ref = ref->next) {
 589                 switch(ref->status) {
 590                 case REF_STATUS_NONE:
 591                 case REF_STATUS_UPTODATE:
 592                         break;
 593                 default:
 594                         return 1;
 595                 }
 596         }
 597         return 0;
 598 }
 599
 600 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 601 {
 602         struct refspec rs;
 603
 604         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 605                 return;
 606
 607         rs.src = ref->name;
 608         rs.dst = NULL;
 609
 610         if (!remote_find_tracking(remote, &rs)) {
 611                 if (verbose)
 612                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 613                 if (ref->deletion) {
 614                         delete_ref(rs.dst, NULL, 0);
 615                 } else
 616                         update_ref("update by push", rs.dst,
 617                                         ref->new_sha1, NULL, 0, 0);
 618                 free(rs.dst);
 619         }
 620 }
 621
 622 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 623 {
 624         if (porcelain) {
 625                 if (from)
 626                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 627                 else
 628                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 629                 if (msg)
 630                         fprintf(stdout, "%s (%s)\n", summary, msg);
 631                 else
 632                         fprintf(stdout, "%s\n", summary);
 633         } else {
 634                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 635                 if (from)
 636                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 637                 else
 638                         fputs(prettify_refname(to->name), stderr);
 639                 if (msg) {
 640                         fputs(" (", stderr);
 641                         fputs(msg, stderr);
 642                         fputc(')', stderr);
 643                 }
 644                 fputc('\n', stderr);
 645         }
 646 }
 647
 648 static const char *status_abbrev(unsigned char sha1[20])
 649 {
 650         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 651 }
 652
 653 static void print_ok_ref_status(struct ref *ref, int porcelain)
 654 {
 655         if (ref->deletion)
 656                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 657         else if (is_null_sha1(ref->old_sha1))
 658                 print_ref_status('*',
 659                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 660                         "[new branch]"),
 661                         ref, ref->peer_ref, NULL, porcelain);
 662         else {
 663                 char quickref[84];
 664                 char type;
 665                 const char *msg;
 666
 667                 strcpy(quickref, status_abbrev(ref->old_sha1));
 668                 if (ref->forced_update) {
 669                         strcat(quickref, "...");
 670                         type = '+';
 671                         msg = "forced update";
 672                 } else {
 673                         strcat(quickref, "..");
 674                         type = ' ';
 675                         msg = NULL;
 676                 }
 677                 strcat(quickref, status_abbrev(ref->new_sha1));
 678
 679                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 680         }
 681 }
 682
 683 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 684 {
 685         if (!count)
 686                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 687
 688         switch(ref->status) {
 689         case REF_STATUS_NONE:
 690                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 691                 break;
 692         case REF_STATUS_REJECT_NODELETE:
 693                 print_ref_status('!', "[rejected]", ref, NULL,
 694                                                  "remote does not support deleting refs", porcelain);
 695                 break;
 696         case REF_STATUS_UPTODATE:
 697                 print_ref_status('=', "[up to date]", ref,
 698                                                  ref->peer_ref, NULL, porcelain);
 699                 break;
 700         case REF_STATUS_REJECT_NONFASTFORWARD:
 701                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 702                                                  "non-fast-forward", porcelain);
 703                 break;
 704         case REF_STATUS_REJECT_ALREADY_EXISTS:
 705                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 706                                                  "already exists", porcelain);
 707                 break;
 708         case REF_STATUS_REJECT_FETCH_FIRST:
 709                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 710                                                  "fetch first", porcelain);
 711                 break;
 712         case REF_STATUS_REJECT_NEEDS_FORCE:
 713                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 714                                                  "needs force", porcelain);
 715                 break;
 716         case REF_STATUS_REJECT_STALE:
 717                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 718                                                  "stale info", porcelain);
 719                 break;
 720         case REF_STATUS_REJECT_SHALLOW:
 721                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 722                                                  "new shallow roots not allowed", porcelain);
 723                 break;
 724         case REF_STATUS_REMOTE_REJECT:
 725                 print_ref_status('!', "[remote rejected]", ref,
 726                                                  ref->deletion ? NULL : ref->peer_ref,
 727                                                  ref->remote_status, porcelain);
 728                 break;
 729         case REF_STATUS_EXPECTING_REPORT:
 730                 print_ref_status('!', "[remote failure]", ref,
 731                                                  ref->deletion ? NULL : ref->peer_ref,
 732                                                  "remote failed to report status", porcelain);
 733                 break;
 734         case REF_STATUS_ATOMIC_PUSH_FAILED:
 735                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 736                                                  "atomic push failed", porcelain);
 737                 break;
 738         case REF_STATUS_OK:
 739                 print_ok_ref_status(ref, porcelain);
 740                 break;
 741         }
 742
 743         return 1;
 744 }
 745
 746 void transport_print_push_status(const char *dest, struct ref *refs,
 747                                   int verbose, int porcelain, unsigned int *reject_reasons)
 748 {
 749         struct ref *ref;
 750         int n = 0;
 751         unsigned char head_sha1[20];
 752         char *head;
 753
 754         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 755
 756         if (verbose) {
 757                 for (ref = refs; ref; ref = ref->next)
 758                         if (ref->status == REF_STATUS_UPTODATE)
 759                                 n += print_one_push_status(ref, dest, n, porcelain);
 760         }
 761
 762         for (ref = refs; ref; ref = ref->next)
 763                 if (ref->status == REF_STATUS_OK)
 764                         n += print_one_push_status(ref, dest, n, porcelain);
 765
 766         *reject_reasons = 0;
 767         for (ref = refs; ref; ref = ref->next) {
 768                 if (ref->status != REF_STATUS_NONE &&
 769                     ref->status != REF_STATUS_UPTODATE &&
 770                     ref->status != REF_STATUS_OK)
 771                         n += print_one_push_status(ref, dest, n, porcelain);
 772                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 773                         if (head != NULL && !strcmp(head, ref->name))
 774                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 775                         else
 776                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 777                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 778                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 779                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 780                         *reject_reasons |= REJECT_FETCH_FIRST;
 781                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 782                         *reject_reasons |= REJECT_NEEDS_FORCE;
 783                 }
 784         }
 785         free(head);
 786 }
 787
 788 void transport_verify_remote_names(int nr_heads, const char **heads)
 789 {
 790         int i;
 791
 792         for (i = 0; i < nr_heads; i++) {
 793                 const char *local = heads[i];
 794                 const char *remote = strrchr(heads[i], ':');
 795
 796                 if (*local == '+')
 797                         local++;
 798
 799                 /* A matching refspec is okay.  */
 800                 if (remote == local && remote[1] == '\0')
 801                         continue;
 802
 803                 remote = remote ? (remote + 1) : local;
 804                 if (check_refname_format(remote,
 805                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 806                         die("remote part of refspec is not a valid name in %s",
 807                                 heads[i]);
 808         }
 809 }
 810
 811 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 812 {
 813         struct git_transport_data *data = transport->data;
 814         struct send_pack_args args;
 815         int ret;
 816
 817         if (!data->got_remote_heads) {
 818                 struct ref *tmp_refs;
 819                 connect_setup(transport, 1, 0);
 820
 821                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 822                                  NULL, &data->shallow);
 823                 data->got_remote_heads = 1;
 824         }
 825
 826         memset(&args, 0, sizeof(args));
 827         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 828         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 829         args.use_thin_pack = data->options.thin;
 830         args.verbose = (transport->verbose > 0);
 831         args.quiet = (transport->verbose < 0);
 832         args.progress = transport->progress;
 833         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 834         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 835         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 836         args.url = transport->url;
 837
 838         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 839                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 840         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 841                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 842         else
 843                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 844
 845         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 846                         &data->extra_have);
 847
 848         close(data->fd[1]);
 849         close(data->fd[0]);
 850         ret |= finish_connect(data->conn);
 851         data->conn = NULL;
 852         data->got_remote_heads = 0;
 853
 854         return ret;
 855 }
 856
 857 static int connect_git(struct transport *transport, const char *name,
 858                        const char *executable, int fd[2])
 859 {
 860         struct git_transport_data *data = transport->data;
 861         data->conn = git_connect(data->fd, transport->url,
 862                                  executable, 0);
 863         fd[0] = data->fd[0];
 864         fd[1] = data->fd[1];
 865         return 0;
 866 }
 867
 868 static int disconnect_git(struct transport *transport)
 869 {
 870         struct git_transport_data *data = transport->data;
 871         if (data->conn) {
 872                 if (data->got_remote_heads)
 873                         packet_flush(data->fd[1]);
 874                 close(data->fd[0]);
 875                 close(data->fd[1]);
 876                 finish_connect(data->conn);
 877         }
 878
 879         free(data);
 880         return 0;
 881 }
 882
 883 void transport_take_over(struct transport *transport,
 884                          struct child_process *child)
 885 {
 886         struct git_transport_data *data;
 887
 888         if (!transport->smart_options)
 889                 die("Bug detected: Taking over transport requires non-NULL "
 890                     "smart_options field.");
 891
 892         data = xcalloc(1, sizeof(*data));
 893         data->options = *transport->smart_options;
 894         data->conn = child;
 895         data->fd[0] = data->conn->out;
 896         data->fd[1] = data->conn->in;
 897         data->got_remote_heads = 0;
 898         transport->data = data;
 899
 900         transport->set_option = NULL;
 901         transport->get_refs_list = get_refs_via_connect;
 902         transport->fetch = fetch_refs_via_pack;
 903         transport->push = NULL;
 904         transport->push_refs = git_transport_push;
 905         transport->disconnect = disconnect_git;
 906         transport->smart_options = &(data->options);
 907
 908         transport->cannot_reuse = 1;
 909 }
 910
 911 static int is_file(const char *url)
 912 {
 913         struct stat buf;
 914         if (stat(url, &buf))
 915                 return 0;
 916         return S_ISREG(buf.st_mode);
 917 }
 918
 919 static int external_specification_len(const char *url)
 920 {
 921         return strchr(url, ':') - url;
 922 }
 923
 924 struct transport *transport_get(struct remote *remote, const char *url)
 925 {
 926         const char *helper;
 927         struct transport *ret = xcalloc(1, sizeof(*ret));
 928
 929         ret->progress = isatty(2);
 930
 931         if (!remote)
 932                 die("No remote provided to transport_get()");
 933
 934         ret->got_remote_refs = 0;
 935         ret->remote = remote;
 936         helper = remote->foreign_vcs;
 937
 938         if (!url && remote->url)
 939                 url = remote->url[0];
 940         ret->url = url;
 941
 942         /* maybe it is a foreign URL? */
 943         if (url) {
 944                 const char *p = url;
 945
 946                 while (is_urlschemechar(p == url, *p))
 947                         p++;
 948                 if (starts_with(p, "::"))
 949                         helper = xstrndup(url, p - url);
 950         }
 951
 952         if (helper) {
 953                 transport_helper_init(ret, helper);
 954         } else if (starts_with(url, "rsync:")) {
 955                 ret->get_refs_list = get_refs_via_rsync;
 956                 ret->fetch = fetch_objs_via_rsync;
 957                 ret->push = rsync_transport_push;
 958                 ret->smart_options = NULL;
 959         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 960                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 961                 ret->data = data;
 962                 ret->get_refs_list = get_refs_from_bundle;
 963                 ret->fetch = fetch_refs_from_bundle;
 964                 ret->disconnect = close_bundle;
 965                 ret->smart_options = NULL;
 966         } else if (!is_url(url)
 967                 || starts_with(url, "file://")
 968                 || starts_with(url, "git://")
 969                 || starts_with(url, "ssh://")
 970                 || starts_with(url, "git+ssh://")
 971                 || starts_with(url, "ssh+git://")) {
 972                 /* These are builtin smart transports. */
 973                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 974                 ret->data = data;
 975                 ret->set_option = NULL;
 976                 ret->get_refs_list = get_refs_via_connect;
 977                 ret->fetch = fetch_refs_via_pack;
 978                 ret->push_refs = git_transport_push;
 979                 ret->connect = connect_git;
 980                 ret->disconnect = disconnect_git;
 981                 ret->smart_options = &(data->options);
 982
 983                 data->conn = NULL;
 984                 data->got_remote_heads = 0;
 985         } else {
 986                 /* Unknown protocol in URL. Pass to external handler. */
 987                 int len = external_specification_len(url);
 988                 char *handler = xmemdupz(url, len);
 989                 transport_helper_init(ret, handler);
 990         }
 991
 992         if (ret->smart_options) {
 993                 ret->smart_options->thin = 1;
 994                 ret->smart_options->uploadpack = "git-upload-pack";
 995                 if (remote->uploadpack)
 996                         ret->smart_options->uploadpack = remote->uploadpack;
 997                 ret->smart_options->receivepack = "git-receive-pack";
 998                 if (remote->receivepack)
 999                         ret->smart_options->receivepack = remote->receivepack;
1000         }
1001
1002         return ret;
1003 }
1004
1005 int transport_set_option(struct transport *transport,
1006                          const char *name, const char *value)
1007 {
1008         int git_reports = 1, protocol_reports = 1;
1009
1010         if (transport->smart_options)
1011                 git_reports = set_git_option(transport->smart_options,
1012                                              name, value);
1013
1014         if (transport->set_option)
1015                 protocol_reports = transport->set_option(transport, name,
1016                                                         value);
1017
1018         /* If either report is 0, report 0 (success). */
1019         if (!git_reports || !protocol_reports)
1020                 return 0;
1021         /* If either reports -1 (invalid value), report -1. */
1022         if ((git_reports == -1) || (protocol_reports == -1))
1023                 return -1;
1024         /* Otherwise if both report unknown, report unknown. */
1025         return 1;
1026 }
1027
1028 void transport_set_verbosity(struct transport *transport, int verbosity,
1029         int force_progress)
1030 {
1031         if (verbosity >= 1)
1032                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1033         if (verbosity < 0)
1034                 transport->verbose = -1;
1035
1036         /**
1037          * Rules used to determine whether to report progress (processing aborts
1038          * when a rule is satisfied):
1039          *
1040          *   . Report progress, if force_progress is 1 (ie. --progress).
1041          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1042          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1043          *   . Report progress if isatty(2) is 1.
1044          **/
1045         if (force_progress >= 0)
1046                 transport->progress = !!force_progress;
1047         else
1048                 transport->progress = verbosity >= 0 && isatty(2);
1049 }
1050
1051 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1052 {
1053         int i;
1054
1055         fprintf(stderr, "The following submodule paths contain changes that can\n"
1056                         "not be found on any remote:\n");
1057         for (i = 0; i < needs_pushing->nr; i++)
1058                 printf("  %s\n", needs_pushing->items[i].string);
1059         fprintf(stderr, "\nPlease try\n\n"
1060                         "       git push --recurse-submodules=on-demand\n\n"
1061                         "or cd to the path and use\n\n"
1062                         "       git push\n\n"
1063                         "to push them to a remote.\n\n");
1064
1065         string_list_clear(needs_pushing, 0);
1066
1067         die("Aborting.");
1068 }
1069
1070 static int run_pre_push_hook(struct transport *transport,
1071                              struct ref *remote_refs)
1072 {
1073         int ret = 0, x;
1074         struct ref *r;
1075         struct child_process proc = CHILD_PROCESS_INIT;
1076         struct strbuf buf;
1077         const char *argv[4];
1078
1079         if (!(argv[0] = find_hook("pre-push")))
1080                 return 0;
1081
1082         argv[1] = transport->remote->name;
1083         argv[2] = transport->url;
1084         argv[3] = NULL;
1085
1086         proc.argv = argv;
1087         proc.in = -1;
1088
1089         if (start_command(&proc)) {
1090                 finish_command(&proc);
1091                 return -1;
1092         }
1093
1094         strbuf_init(&buf, 256);
1095
1096         for (r = remote_refs; r; r = r->next) {
1097                 if (!r->peer_ref) continue;
1098                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1099                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1100                 if (r->status == REF_STATUS_UPTODATE) continue;
1101
1102                 strbuf_reset(&buf);
1103                 strbuf_addf( &buf, "%s %s %s %s\n",
1104                          r->peer_ref->name, sha1_to_hex(r->new_sha1),
1105                          r->name, sha1_to_hex(r->old_sha1));
1106
1107                 if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1108                         ret = -1;
1109                         break;
1110                 }
1111         }
1112
1113         strbuf_release(&buf);
1114
1115         x = close(proc.in);
1116         if (!ret)
1117                 ret = x;
1118
1119         x = finish_command(&proc);
1120         if (!ret)
1121                 ret = x;
1122
1123         return ret;
1124 }
1125
1126 int transport_push(struct transport *transport,
1127                    int refspec_nr, const char **refspec, int flags,
1128                    unsigned int *reject_reasons)
1129 {
1130         *reject_reasons = 0;
1131         transport_verify_remote_names(refspec_nr, refspec);
1132
1133         if (transport->push) {
1134                 /* Maybe FIXME. But no important transport uses this case. */
1135                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1136                         die("This transport does not support using --set-upstream");
1137                 if (flags & TRANSPORT_PUSH_SET_PUBLISH)
1138                         die("This transport does not support using --set-publish");
1139
1140                 return transport->push(transport, refspec_nr, refspec, flags);
1141         } else if (transport->push_refs) {
1142                 struct ref *remote_refs;
1143                 struct ref *local_refs = get_local_heads();
1144                 int match_flags = MATCH_REFS_NONE;
1145                 int verbose = (transport->verbose > 0);
1146                 int quiet = (transport->verbose < 0);
1147                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1148                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1149                 int push_ret, ret, err;
1150
1151                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1152                         return -1;
1153
1154                 remote_refs = transport->get_refs_list(transport, 1);
1155
1156                 if (flags & TRANSPORT_PUSH_ALL)
1157                         match_flags |= MATCH_REFS_ALL;
1158                 if (flags & TRANSPORT_PUSH_MIRROR)
1159                         match_flags |= MATCH_REFS_MIRROR;
1160                 if (flags & TRANSPORT_PUSH_PRUNE)
1161                         match_flags |= MATCH_REFS_PRUNE;
1162                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1163                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1164
1165                 if (match_push_refs(local_refs, &remote_refs,
1166                                     refspec_nr, refspec, match_flags)) {
1167                         return -1;
1168                 }
1169
1170                 if (transport->smart_options &&
1171                     transport->smart_options->cas &&
1172                     !is_empty_cas(transport->smart_options->cas))
1173                         apply_push_cas(transport->smart_options->cas,
1174                                        transport->remote, remote_refs);
1175
1176                 set_ref_status_for_push(remote_refs,
1177                         flags & TRANSPORT_PUSH_MIRROR,
1178                         flags & TRANSPORT_PUSH_FORCE);
1179
1180                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1181                         if (run_pre_push_hook(transport, remote_refs))
1182                                 return -1;
1183
1184                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1185                         struct ref *ref = remote_refs;
1186                         for (; ref; ref = ref->next)
1187                                 if (!is_null_sha1(ref->new_sha1) &&
1188                                     !push_unpushed_submodules(ref->new_sha1,
1189                                             transport->remote->name))
1190                                     die ("Failed to push all needed submodules!");
1191                 }
1192
1193                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1194                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1195                         struct ref *ref = remote_refs;
1196                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1197
1198                         for (; ref; ref = ref->next)
1199                                 if (!is_null_sha1(ref->new_sha1) &&
1200                                     find_unpushed_submodules(ref->new_sha1,
1201                                             transport->remote->name, &needs_pushing))
1202                                         die_with_unpushed_submodules(&needs_pushing);
1203                 }
1204
1205                 push_ret = transport->push_refs(transport, remote_refs, flags);
1206                 err = push_had_errors(remote_refs);
1207                 ret = push_ret | err;
1208
1209                 if (!quiet || err)
1210                         transport_print_push_status(transport->url, remote_refs,
1211                                         verbose | porcelain, porcelain,
1212                                         reject_reasons);
1213
1214                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1215                         set_tracking(transport, remote_refs, pretend, 0);
1216                 if (flags & TRANSPORT_PUSH_SET_PUBLISH)
1217                         set_tracking(transport, remote_refs, pretend, 1);
1218
1219                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1220                         struct ref *ref;
1221                         for (ref = remote_refs; ref; ref = ref->next)
1222                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1223                 }
1224
1225                 if (porcelain && !push_ret)
1226                         puts("Done");
1227                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1228                         fprintf(stderr, "Everything up-to-date\n");
1229
1230                 return ret;
1231         }
1232         return 1;
1233 }
1234
1235 const struct ref *transport_get_remote_refs(struct transport *transport)
1236 {
1237         if (!transport->got_remote_refs) {
1238                 transport->remote_refs = transport->get_refs_list(transport, 0);
1239                 transport->got_remote_refs = 1;
1240         }
1241
1242         return transport->remote_refs;
1243 }
1244
1245 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1246 {
1247         int rc;
1248         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1249         struct ref **heads = NULL;
1250         struct ref *rm;
1251
1252         for (rm = refs; rm; rm = rm->next) {
1253                 nr_refs++;
1254                 if (rm->peer_ref &&
1255                     !is_null_sha1(rm->old_sha1) &&
1256                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1257                         continue;
1258                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1259                 heads[nr_heads++] = rm;
1260         }
1261
1262         if (!nr_heads) {
1263                 /*
1264                  * When deepening of a shallow repository is requested,
1265                  * then local and remote refs are likely to still be equal.
1266                  * Just feed them all to the fetch method in that case.
1267                  * This condition shouldn't be met in a non-deepening fetch
1268                  * (see builtin/fetch.c:quickfetch()).
1269                  */
1270                 heads = xmalloc(nr_refs * sizeof(*heads));
1271                 for (rm = refs; rm; rm = rm->next)
1272                         heads[nr_heads++] = rm;
1273         }
1274
1275         rc = transport->fetch(transport, nr_heads, heads);
1276
1277         free(heads);
1278         return rc;
1279 }
1280
1281 void transport_unlock_pack(struct transport *transport)
1282 {
1283         if (transport->pack_lockfile) {
1284                 unlink_or_warn(transport->pack_lockfile);
1285                 free(transport->pack_lockfile);
1286                 transport->pack_lockfile = NULL;
1287         }
1288 }
1289
1290 int transport_connect(struct transport *transport, const char *name,
1291                       const char *exec, int fd[2])
1292 {
1293         if (transport->connect)
1294                 return transport->connect(transport, name, exec, fd);
1295         else
1296                 die("Operation not supported by protocol");
1297 }
1298
1299 int transport_disconnect(struct transport *transport)
1300 {
1301         int ret = 0;
1302         if (transport->disconnect)
1303                 ret = transport->disconnect(transport);
1304         free(transport);
1305         return ret;
1306 }
1307
1308 /*
1309  * Strip username (and password) from a URL and return
1310  * it in a newly allocated string.
1311  */
1312 char *transport_anonymize_url(const char *url)
1313 {
1314         char *anon_url, *scheme_prefix, *anon_part;
1315         size_t anon_len, prefix_len = 0;
1316
1317         anon_part = strchr(url, '@');
1318         if (url_is_local_not_ssh(url) || !anon_part)
1319                 goto literal_copy;
1320
1321         anon_len = strlen(++anon_part);
1322         scheme_prefix = strstr(url, "://");
1323         if (!scheme_prefix) {
1324                 if (!strchr(anon_part, ':'))
1325                         /* cannot be "me@there:/path/name" */
1326                         goto literal_copy;
1327         } else {
1328                 const char *cp;
1329                 /* make sure scheme is reasonable */
1330                 for (cp = url; cp < scheme_prefix; cp++) {
1331                         switch (*cp) {
1332                                 /* RFC 1738 2.1 */
1333                         case '+': case '.': case '-':
1334                                 break; /* ok */
1335                         default:
1336                                 if (isalnum(*cp))
1337                                         break;
1338                                 /* it isn't */
1339                                 goto literal_copy;
1340                         }
1341                 }
1342                 /* @ past the first slash does not count */
1343                 cp = strchr(scheme_prefix + 3, '/');
1344                 if (cp && cp < anon_part)
1345                         goto literal_copy;
1346                 prefix_len = scheme_prefix - url + 3;
1347         }
1348         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1349         memcpy(anon_url, url, prefix_len);
1350         memcpy(anon_url + prefix_len, anon_part, anon_len);
1351         return anon_url;
1352 literal_copy:
1353         return xstrdup(url);
1354 }
1355
1356 struct alternate_refs_data {
1357         alternate_ref_fn *fn;
1358         void *data;
1359 };
1360
1361 static int refs_from_alternate_cb(struct alternate_object_database *e,
1362                                   void *data)
1363 {
1364         char *other;
1365         size_t len;
1366         struct remote *remote;
1367         struct transport *transport;
1368         const struct ref *extra;
1369         struct alternate_refs_data *cb = data;
1370
1371         e->name[-1] = '\0';
1372         other = xstrdup(real_path(e->base));
1373         e->name[-1] = '/';
1374         len = strlen(other);
1375
1376         while (other[len-1] == '/')
1377                 other[--len] = '\0';
1378         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1379                 goto out;
1380         /* Is this a git repository with refs? */
1381         memcpy(other + len - 8, "/refs", 6);
1382         if (!is_directory(other))
1383                 goto out;
1384         other[len - 8] = '\0';
1385         remote = remote_get(other);
1386         transport = transport_get(remote, other);
1387         for (extra = transport_get_remote_refs(transport);
1388              extra;
1389              extra = extra->next)
1390                 cb->fn(extra, cb->data);
1391         transport_disconnect(transport);
1392 out:
1393         free(other);
1394         return 0;
1395 }
1396
1397 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1398 {
1399         struct alternate_refs_data cb;
1400         cb.fn = fn;
1401         cb.data = data;
1402         foreach_alt_odb(refs_from_alternate_cb, &cb);
1403 }