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

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