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, sha, 1, &flag);
 172                 if (tmp && flag & REF_ISSYMREF &&
 173                         starts_with(tmp, "refs/heads/"))
 174                         localname = tmp;
 175
 176                 /* Both source and destination must be local branches. */
 177                 if (!localname || !starts_with(localname, "refs/heads/"))
 178                         continue;
 179                 if (!remotename || !starts_with(remotename, "refs/heads/"))
 180                         continue;
 181
 182                 if (!pretend) {
 183                         if (publish)
 184                                 install_branch_publish(localname + 11,
 185                                                 transport->remote->name,
 186                                                 remotename);
 187                         else
 188                                 install_branch_config(BRANCH_CONFIG_VERBOSE,
 189                                                 localname + 11, transport->remote->name,
 190                                                 remotename);
 191                 } else
 192                         printf("Would set %s of '%s' to '%s' of '%s'\n",
 193                                 publish ? "publish" : "upstream",
 194                                 localname + 11, remotename + 11,
 195                                 transport->remote->name);
 196         }
 197 }
 198
 199 static const char *rsync_url(const char *url)
 200 {
 201         return !starts_with(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 202 }
 203
 204 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 205 {
 206         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 207         struct ref dummy = {NULL}, *tail = &dummy;
 208         struct child_process rsync;
 209         const char *args[5];
 210         int temp_dir_len;
 211
 212         if (for_push)
 213                 return NULL;
 214
 215         /* copy the refs to the temporary directory */
 216
 217         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 218         if (!mkdtemp(temp_dir.buf))
 219                 die_errno ("Could not make temporary directory");
 220         temp_dir_len = temp_dir.len;
 221
 222         strbuf_addstr(&buf, rsync_url(transport->url));
 223         strbuf_addstr(&buf, "/refs");
 224
 225         memset(&rsync, 0, sizeof(rsync));
 226         rsync.argv = args;
 227         rsync.stdout_to_stderr = 1;
 228         args[0] = "rsync";
 229         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 230         args[2] = buf.buf;
 231         args[3] = temp_dir.buf;
 232         args[4] = NULL;
 233
 234         if (run_command(&rsync))
 235                 die ("Could not run rsync to get refs");
 236
 237         strbuf_reset(&buf);
 238         strbuf_addstr(&buf, rsync_url(transport->url));
 239         strbuf_addstr(&buf, "/packed-refs");
 240
 241         args[2] = buf.buf;
 242
 243         if (run_command(&rsync))
 244                 die ("Could not run rsync to get refs");
 245
 246         /* read the copied refs */
 247
 248         strbuf_addstr(&temp_dir, "/refs");
 249         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 250         strbuf_setlen(&temp_dir, temp_dir_len);
 251
 252         tail = &dummy;
 253         strbuf_addstr(&temp_dir, "/packed-refs");
 254         insert_packed_refs(temp_dir.buf, &tail);
 255         strbuf_setlen(&temp_dir, temp_dir_len);
 256
 257         if (remove_dir_recursively(&temp_dir, 0))
 258                 warning ("Error removing temporary directory %s.",
 259                                 temp_dir.buf);
 260
 261         strbuf_release(&buf);
 262         strbuf_release(&temp_dir);
 263
 264         return dummy.next;
 265 }
 266
 267 static int fetch_objs_via_rsync(struct transport *transport,
 268                                 int nr_objs, struct ref **to_fetch)
 269 {
 270         struct strbuf buf = STRBUF_INIT;
 271         struct child_process rsync;
 272         const char *args[8];
 273         int result;
 274
 275         strbuf_addstr(&buf, rsync_url(transport->url));
 276         strbuf_addstr(&buf, "/objects/");
 277
 278         memset(&rsync, 0, sizeof(rsync));
 279         rsync.argv = args;
 280         rsync.stdout_to_stderr = 1;
 281         args[0] = "rsync";
 282         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 283         args[2] = "--ignore-existing";
 284         args[3] = "--exclude";
 285         args[4] = "info";
 286         args[5] = buf.buf;
 287         args[6] = get_object_directory();
 288         args[7] = NULL;
 289
 290         /* NEEDSWORK: handle one level of alternates */
 291         result = run_command(&rsync);
 292
 293         strbuf_release(&buf);
 294
 295         return result;
 296 }
 297
 298 static int write_one_ref(const char *name, const unsigned char *sha1,
 299                 int flags, void *data)
 300 {
 301         struct strbuf *buf = data;
 302         int len = buf->len;
 303         FILE *f;
 304
 305         /* when called via for_each_ref(), flags is non-zero */
 306         if (flags && !starts_with(name, "refs/heads/") &&
 307                         !starts_with(name, "refs/tags/"))
 308                 return 0;
 309
 310         strbuf_addstr(buf, name);
 311         if (safe_create_leading_directories(buf->buf) ||
 312                         !(f = fopen(buf->buf, "w")) ||
 313                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 314                         fclose(f))
 315                 return error("problems writing temporary file %s", buf->buf);
 316         strbuf_setlen(buf, len);
 317         return 0;
 318 }
 319
 320 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 321                 int refspec_nr, const char **refspec)
 322 {
 323         int i;
 324
 325         for (i = 0; i < refspec_nr; i++) {
 326                 unsigned char sha1[20];
 327                 char *ref;
 328
 329                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 330                         return error("Could not get ref %s", refspec[i]);
 331
 332                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 333                         free(ref);
 334                         return -1;
 335                 }
 336                 free(ref);
 337         }
 338         return 0;
 339 }
 340
 341 static int rsync_transport_push(struct transport *transport,
 342                 int refspec_nr, const char **refspec, int flags)
 343 {
 344         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 345         int result = 0, i;
 346         struct child_process rsync;
 347         const char *args[10];
 348
 349         if (flags & TRANSPORT_PUSH_MIRROR)
 350                 return error("rsync transport does not support mirror mode");
 351
 352         /* first push the objects */
 353
 354         strbuf_addstr(&buf, rsync_url(transport->url));
 355         strbuf_addch(&buf, '/');
 356
 357         memset(&rsync, 0, sizeof(rsync));
 358         rsync.argv = args;
 359         rsync.stdout_to_stderr = 1;
 360         i = 0;
 361         args[i++] = "rsync";
 362         args[i++] = "-a";
 363         if (flags & TRANSPORT_PUSH_DRY_RUN)
 364                 args[i++] = "--dry-run";
 365         if (transport->verbose > 1)
 366                 args[i++] = "-v";
 367         args[i++] = "--ignore-existing";
 368         args[i++] = "--exclude";
 369         args[i++] = "info";
 370         args[i++] = get_object_directory();
 371         args[i++] = buf.buf;
 372         args[i++] = NULL;
 373
 374         if (run_command(&rsync))
 375                 return error("Could not push objects to %s",
 376                                 rsync_url(transport->url));
 377
 378         /* copy the refs to the temporary directory; they could be packed. */
 379
 380         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 381         if (!mkdtemp(temp_dir.buf))
 382                 die_errno ("Could not make temporary directory");
 383         strbuf_addch(&temp_dir, '/');
 384
 385         if (flags & TRANSPORT_PUSH_ALL) {
 386                 if (for_each_ref(write_one_ref, &temp_dir))
 387                         return -1;
 388         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 389                 return -1;
 390
 391         i = 2;
 392         if (flags & TRANSPORT_PUSH_DRY_RUN)
 393                 args[i++] = "--dry-run";
 394         if (!(flags & TRANSPORT_PUSH_FORCE))
 395                 args[i++] = "--ignore-existing";
 396         args[i++] = temp_dir.buf;
 397         args[i++] = rsync_url(transport->url);
 398         args[i++] = NULL;
 399         if (run_command(&rsync))
 400                 result = error("Could not push to %s",
 401                                 rsync_url(transport->url));
 402
 403         if (remove_dir_recursively(&temp_dir, 0))
 404                 warning ("Could not remove temporary directory %s.",
 405                                 temp_dir.buf);
 406
 407         strbuf_release(&buf);
 408         strbuf_release(&temp_dir);
 409
 410         return result;
 411 }
 412
 413 struct bundle_transport_data {
 414         int fd;
 415         struct bundle_header header;
 416 };
 417
 418 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 419 {
 420         struct bundle_transport_data *data = transport->data;
 421         struct ref *result = NULL;
 422         int i;
 423
 424         if (for_push)
 425                 return NULL;
 426
 427         if (data->fd > 0)
 428                 close(data->fd);
 429         data->fd = read_bundle_header(transport->url, &data->header);
 430         if (data->fd < 0)
 431                 die ("Could not read bundle '%s'.", transport->url);
 432         for (i = 0; i < data->header.references.nr; i++) {
 433                 struct ref_list_entry *e = data->header.references.list + i;
 434                 struct ref *ref = alloc_ref(e->name);
 435                 hashcpy(ref->old_sha1, e->sha1);
 436                 ref->next = result;
 437                 result = ref;
 438         }
 439         return result;
 440 }
 441
 442 static int fetch_refs_from_bundle(struct transport *transport,
 443                                int nr_heads, struct ref **to_fetch)
 444 {
 445         struct bundle_transport_data *data = transport->data;
 446         return unbundle(&data->header, data->fd,
 447                         transport->progress ? BUNDLE_VERBOSE : 0);
 448 }
 449
 450 static int close_bundle(struct transport *transport)
 451 {
 452         struct bundle_transport_data *data = transport->data;
 453         if (data->fd > 0)
 454                 close(data->fd);
 455         free(data);
 456         return 0;
 457 }
 458
 459 struct git_transport_data {
 460         struct git_transport_options options;
 461         struct child_process *conn;
 462         int fd[2];
 463         unsigned got_remote_heads : 1;
 464         struct sha1_array extra_have;
 465         struct sha1_array shallow;
 466 };
 467
 468 static int set_git_option(struct git_transport_options *opts,
 469                           const char *name, const char *value)
 470 {
 471         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 472                 opts->uploadpack = value;
 473                 return 0;
 474         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 475                 opts->receivepack = value;
 476                 return 0;
 477         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 478                 opts->thin = !!value;
 479                 return 0;
 480         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 481                 opts->followtags = !!value;
 482                 return 0;
 483         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 484                 opts->keep = !!value;
 485                 return 0;
 486         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 487                 opts->update_shallow = !!value;
 488                 return 0;
 489         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 490                 if (!value)
 491                         opts->depth = 0;
 492                 else {
 493                         char *end;
 494                         opts->depth = strtol(value, &end, 0);
 495                         if (*end)
 496                                 die("transport: invalid depth option '%s'", value);
 497                 }
 498                 return 0;
 499         }
 500         return 1;
 501 }
 502
 503 static int connect_setup(struct transport *transport, int for_push, int verbose)
 504 {
 505         struct git_transport_data *data = transport->data;
 506
 507         if (data->conn)
 508                 return 0;
 509
 510         data->conn = git_connect(data->fd, transport->url,
 511                                  for_push ? data->options.receivepack :
 512                                  data->options.uploadpack,
 513                                  verbose ? CONNECT_VERBOSE : 0);
 514
 515         return 0;
 516 }
 517
 518 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 519 {
 520         struct git_transport_data *data = transport->data;
 521         struct ref *refs;
 522
 523         connect_setup(transport, for_push, 0);
 524         get_remote_heads(data->fd[0], NULL, 0, &refs,
 525                          for_push ? REF_NORMAL : 0,
 526                          &data->extra_have,
 527                          &data->shallow);
 528         data->got_remote_heads = 1;
 529
 530         return refs;
 531 }
 532
 533 static int fetch_refs_via_pack(struct transport *transport,
 534                                int nr_heads, struct ref **to_fetch)
 535 {
 536         struct git_transport_data *data = transport->data;
 537         const struct ref *refs;
 538         char *dest = xstrdup(transport->url);
 539         struct fetch_pack_args args;
 540         struct ref *refs_tmp = NULL;
 541
 542         memset(&args, 0, sizeof(args));
 543         args.uploadpack = data->options.uploadpack;
 544         args.keep_pack = data->options.keep;
 545         args.lock_pack = 1;
 546         args.use_thin_pack = data->options.thin;
 547         args.include_tag = data->options.followtags;
 548         args.verbose = (transport->verbose > 1);
 549         args.quiet = (transport->verbose < 0);
 550         args.no_progress = !transport->progress;
 551         args.depth = data->options.depth;
 552         args.check_self_contained_and_connected =
 553                 data->options.check_self_contained_and_connected;
 554         args.cloning = transport->cloning;
 555         args.update_shallow = data->options.update_shallow;
 556
 557         if (!data->got_remote_heads) {
 558                 connect_setup(transport, 0, 0);
 559                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 560                                  NULL, &data->shallow);
 561                 data->got_remote_heads = 1;
 562         }
 563
 564         refs = fetch_pack(&args, data->fd, data->conn,
 565                           refs_tmp ? refs_tmp : transport->remote_refs,
 566                           dest, to_fetch, nr_heads, &data->shallow,
 567                           &transport->pack_lockfile);
 568         close(data->fd[0]);
 569         close(data->fd[1]);
 570         if (finish_connect(data->conn))
 571                 refs = NULL;
 572         data->conn = NULL;
 573         data->got_remote_heads = 0;
 574         data->options.self_contained_and_connected =
 575                 args.self_contained_and_connected;
 576
 577         free_refs(refs_tmp);
 578
 579         free(dest);
 580         return (refs ? 0 : -1);
 581 }
 582
 583 static int push_had_errors(struct ref *ref)
 584 {
 585         for (; ref; ref = ref->next) {
 586                 switch (ref->status) {
 587                 case REF_STATUS_NONE:
 588                 case REF_STATUS_UPTODATE:
 589                 case REF_STATUS_OK:
 590                         break;
 591                 default:
 592                         return 1;
 593                 }
 594         }
 595         return 0;
 596 }
 597
 598 int transport_refs_pushed(struct ref *ref)
 599 {
 600         for (; ref; ref = ref->next) {
 601                 switch(ref->status) {
 602                 case REF_STATUS_NONE:
 603                 case REF_STATUS_UPTODATE:
 604                         break;
 605                 default:
 606                         return 1;
 607                 }
 608         }
 609         return 0;
 610 }
 611
 612 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 613 {
 614         struct refspec rs;
 615
 616         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 617                 return;
 618
 619         rs.src = ref->name;
 620         rs.dst = NULL;
 621
 622         if (!remote_find_tracking(remote, &rs)) {
 623                 if (verbose)
 624                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 625                 if (ref->deletion) {
 626                         delete_ref(rs.dst, NULL, 0);
 627                 } else
 628                         update_ref("update by push", rs.dst,
 629                                         ref->new_sha1, NULL, 0, 0);
 630                 free(rs.dst);
 631         }
 632 }
 633
 634 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 635 {
 636         if (porcelain) {
 637                 if (from)
 638                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 639                 else
 640                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 641                 if (msg)
 642                         fprintf(stdout, "%s (%s)\n", summary, msg);
 643                 else
 644                         fprintf(stdout, "%s\n", summary);
 645         } else {
 646                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 647                 if (from)
 648                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 649                 else
 650                         fputs(prettify_refname(to->name), stderr);
 651                 if (msg) {
 652                         fputs(" (", stderr);
 653                         fputs(msg, stderr);
 654                         fputc(')', stderr);
 655                 }
 656                 fputc('\n', stderr);
 657         }
 658 }
 659
 660 static const char *status_abbrev(unsigned char sha1[20])
 661 {
 662         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 663 }
 664
 665 static void print_ok_ref_status(struct ref *ref, int porcelain)
 666 {
 667         if (ref->deletion)
 668                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 669         else if (is_null_sha1(ref->old_sha1))
 670                 print_ref_status('*',
 671                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 672                         "[new branch]"),
 673                         ref, ref->peer_ref, NULL, porcelain);
 674         else {
 675                 char quickref[84];
 676                 char type;
 677                 const char *msg;
 678
 679                 strcpy(quickref, status_abbrev(ref->old_sha1));
 680                 if (ref->forced_update) {
 681                         strcat(quickref, "...");
 682                         type = '+';
 683                         msg = "forced update";
 684                 } else {
 685                         strcat(quickref, "..");
 686                         type = ' ';
 687                         msg = NULL;
 688                 }
 689                 strcat(quickref, status_abbrev(ref->new_sha1));
 690
 691                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 692         }
 693 }
 694
 695 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 696 {
 697         if (!count)
 698                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 699
 700         switch(ref->status) {
 701         case REF_STATUS_NONE:
 702                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 703                 break;
 704         case REF_STATUS_REJECT_NODELETE:
 705                 print_ref_status('!', "[rejected]", ref, NULL,
 706                                                  "remote does not support deleting refs", porcelain);
 707                 break;
 708         case REF_STATUS_UPTODATE:
 709                 print_ref_status('=', "[up to date]", ref,
 710                                                  ref->peer_ref, NULL, porcelain);
 711                 break;
 712         case REF_STATUS_REJECT_NONFASTFORWARD:
 713                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 714                                                  "non-fast-forward", porcelain);
 715                 break;
 716         case REF_STATUS_REJECT_ALREADY_EXISTS:
 717                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 718                                                  "already exists", porcelain);
 719                 break;
 720         case REF_STATUS_REJECT_FETCH_FIRST:
 721                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 722                                                  "fetch first", porcelain);
 723                 break;
 724         case REF_STATUS_REJECT_NEEDS_FORCE:
 725                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 726                                                  "needs force", porcelain);
 727                 break;
 728         case REF_STATUS_REJECT_STALE:
 729                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 730                                                  "stale info", porcelain);
 731                 break;
 732         case REF_STATUS_REJECT_SHALLOW:
 733                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 734                                                  "new shallow roots not allowed", porcelain);
 735                 break;
 736         case REF_STATUS_REMOTE_REJECT:
 737                 print_ref_status('!', "[remote rejected]", ref,
 738                                                  ref->deletion ? NULL : ref->peer_ref,
 739                                                  ref->remote_status, porcelain);
 740                 break;
 741         case REF_STATUS_EXPECTING_REPORT:
 742                 print_ref_status('!', "[remote failure]", ref,
 743                                                  ref->deletion ? NULL : ref->peer_ref,
 744                                                  "remote failed to report status", porcelain);
 745                 break;
 746         case REF_STATUS_OK:
 747                 print_ok_ref_status(ref, porcelain);
 748                 break;
 749         }
 750
 751         return 1;
 752 }
 753
 754 void transport_print_push_status(const char *dest, struct ref *refs,
 755                                   int verbose, int porcelain, unsigned int *reject_reasons)
 756 {
 757         struct ref *ref;
 758         int n = 0;
 759         unsigned char head_sha1[20];
 760         char *head;
 761
 762         head = resolve_refdup("HEAD", head_sha1, 1, NULL);
 763
 764         if (verbose) {
 765                 for (ref = refs; ref; ref = ref->next)
 766                         if (ref->status == REF_STATUS_UPTODATE)
 767                                 n += print_one_push_status(ref, dest, n, porcelain);
 768         }
 769
 770         for (ref = refs; ref; ref = ref->next)
 771                 if (ref->status == REF_STATUS_OK)
 772                         n += print_one_push_status(ref, dest, n, porcelain);
 773
 774         *reject_reasons = 0;
 775         for (ref = refs; ref; ref = ref->next) {
 776                 if (ref->status != REF_STATUS_NONE &&
 777                     ref->status != REF_STATUS_UPTODATE &&
 778                     ref->status != REF_STATUS_OK)
 779                         n += print_one_push_status(ref, dest, n, porcelain);
 780                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 781                         if (head != NULL && !strcmp(head, ref->name))
 782                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 783                         else
 784                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 785                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 786                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 787                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 788                         *reject_reasons |= REJECT_FETCH_FIRST;
 789                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 790                         *reject_reasons |= REJECT_NEEDS_FORCE;
 791                 }
 792         }
 793 }
 794
 795 void transport_verify_remote_names(int nr_heads, const char **heads)
 796 {
 797         int i;
 798
 799         for (i = 0; i < nr_heads; i++) {
 800                 const char *local = heads[i];
 801                 const char *remote = strrchr(heads[i], ':');
 802
 803                 if (*local == '+')
 804                         local++;
 805
 806                 /* A matching refspec is okay.  */
 807                 if (remote == local && remote[1] == '\0')
 808                         continue;
 809
 810                 remote = remote ? (remote + 1) : local;
 811                 if (check_refname_format(remote,
 812                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 813                         die("remote part of refspec is not a valid name in %s",
 814                                 heads[i]);
 815         }
 816 }
 817
 818 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 819 {
 820         struct git_transport_data *data = transport->data;
 821         struct send_pack_args args;
 822         int ret;
 823
 824         if (!data->got_remote_heads) {
 825                 struct ref *tmp_refs;
 826                 connect_setup(transport, 1, 0);
 827
 828                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 829                                  NULL, &data->shallow);
 830                 data->got_remote_heads = 1;
 831         }
 832
 833         memset(&args, 0, sizeof(args));
 834         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 835         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 836         args.use_thin_pack = data->options.thin;
 837         args.verbose = (transport->verbose > 0);
 838         args.quiet = (transport->verbose < 0);
 839         args.progress = transport->progress;
 840         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 841         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 842
 843         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 844                         &data->extra_have);
 845
 846         close(data->fd[1]);
 847         close(data->fd[0]);
 848         ret |= finish_connect(data->conn);
 849         data->conn = NULL;
 850         data->got_remote_heads = 0;
 851
 852         return ret;
 853 }
 854
 855 static int connect_git(struct transport *transport, const char *name,
 856                        const char *executable, int fd[2])
 857 {
 858         struct git_transport_data *data = transport->data;
 859         data->conn = git_connect(data->fd, transport->url,
 860                                  executable, 0);
 861         fd[0] = data->fd[0];
 862         fd[1] = data->fd[1];
 863         return 0;
 864 }
 865
 866 static int disconnect_git(struct transport *transport)
 867 {
 868         struct git_transport_data *data = transport->data;
 869         if (data->conn) {
 870                 if (data->got_remote_heads)
 871                         packet_flush(data->fd[1]);
 872                 close(data->fd[0]);
 873                 close(data->fd[1]);
 874                 finish_connect(data->conn);
 875         }
 876
 877         free(data);
 878         return 0;
 879 }
 880
 881 void transport_take_over(struct transport *transport,
 882                          struct child_process *child)
 883 {
 884         struct git_transport_data *data;
 885
 886         if (!transport->smart_options)
 887                 die("Bug detected: Taking over transport requires non-NULL "
 888                     "smart_options field.");
 889
 890         data = xcalloc(1, sizeof(*data));
 891         data->options = *transport->smart_options;
 892         data->conn = child;
 893         data->fd[0] = data->conn->out;
 894         data->fd[1] = data->conn->in;
 895         data->got_remote_heads = 0;
 896         transport->data = data;
 897
 898         transport->set_option = NULL;
 899         transport->get_refs_list = get_refs_via_connect;
 900         transport->fetch = fetch_refs_via_pack;
 901         transport->push = NULL;
 902         transport->push_refs = git_transport_push;
 903         transport->disconnect = disconnect_git;
 904         transport->smart_options = &(data->options);
 905
 906         transport->cannot_reuse = 1;
 907 }
 908
 909 static int is_file(const char *url)
 910 {
 911         struct stat buf;
 912         if (stat(url, &buf))
 913                 return 0;
 914         return S_ISREG(buf.st_mode);
 915 }
 916
 917 static int external_specification_len(const char *url)
 918 {
 919         return strchr(url, ':') - url;
 920 }
 921
 922 struct transport *transport_get(struct remote *remote, const char *url)
 923 {
 924         const char *helper;
 925         struct transport *ret = xcalloc(1, sizeof(*ret));
 926
 927         ret->progress = isatty(2);
 928
 929         if (!remote)
 930                 die("No remote provided to transport_get()");
 931
 932         ret->got_remote_refs = 0;
 933         ret->remote = remote;
 934         helper = remote->foreign_vcs;
 935
 936         if (!url && remote->url)
 937                 url = remote->url[0];
 938         ret->url = url;
 939
 940         /* maybe it is a foreign URL? */
 941         if (url) {
 942                 const char *p = url;
 943
 944                 while (is_urlschemechar(p == url, *p))
 945                         p++;
 946                 if (starts_with(p, "::"))
 947                         helper = xstrndup(url, p - url);
 948         }
 949
 950         if (helper) {
 951                 transport_helper_init(ret, helper);
 952         } else if (starts_with(url, "rsync:")) {
 953                 ret->get_refs_list = get_refs_via_rsync;
 954                 ret->fetch = fetch_objs_via_rsync;
 955                 ret->push = rsync_transport_push;
 956                 ret->smart_options = NULL;
 957         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 958                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 959                 ret->data = data;
 960                 ret->get_refs_list = get_refs_from_bundle;
 961                 ret->fetch = fetch_refs_from_bundle;
 962                 ret->disconnect = close_bundle;
 963                 ret->smart_options = NULL;
 964         } else if (!is_url(url)
 965                 || starts_with(url, "file://")
 966                 || starts_with(url, "git://")
 967                 || starts_with(url, "ssh://")
 968                 || starts_with(url, "git+ssh://")
 969                 || starts_with(url, "ssh+git://")) {
 970                 /* These are builtin smart transports. */
 971                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 972                 ret->data = data;
 973                 ret->set_option = NULL;
 974                 ret->get_refs_list = get_refs_via_connect;
 975                 ret->fetch = fetch_refs_via_pack;
 976                 ret->push_refs = git_transport_push;
 977                 ret->connect = connect_git;
 978                 ret->disconnect = disconnect_git;
 979                 ret->smart_options = &(data->options);
 980
 981                 data->conn = NULL;
 982                 data->got_remote_heads = 0;
 983         } else {
 984                 /* Unknown protocol in URL. Pass to external handler. */
 985                 int len = external_specification_len(url);
 986                 char *handler = xmalloc(len + 1);
 987                 handler[len] = 0;
 988                 strncpy(handler, 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;
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         memset(&proc, 0, sizeof(proc));
1087         proc.argv = argv;
1088         proc.in = -1;
1089
1090         if (start_command(&proc)) {
1091                 finish_command(&proc);
1092                 return -1;
1093         }
1094
1095         strbuf_init(&buf, 256);
1096
1097         for (r = remote_refs; r; r = r->next) {
1098                 if (!r->peer_ref) continue;
1099                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1100                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1101                 if (r->status == REF_STATUS_UPTODATE) continue;
1102
1103                 strbuf_reset(&buf);
1104                 strbuf_addf( &buf, "%s %s %s %s\n",
1105                          r->peer_ref->name, sha1_to_hex(r->new_sha1),
1106                          r->name, sha1_to_hex(r->old_sha1));
1107
1108                 if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1109                         ret = -1;
1110                         break;
1111                 }
1112         }
1113
1114         strbuf_release(&buf);
1115
1116         x = close(proc.in);
1117         if (!ret)
1118                 ret = x;
1119
1120         x = finish_command(&proc);
1121         if (!ret)
1122                 ret = x;
1123
1124         return ret;
1125 }
1126
1127 int transport_push(struct transport *transport,
1128                    int refspec_nr, const char **refspec, int flags,
1129                    unsigned int *reject_reasons)
1130 {
1131         *reject_reasons = 0;
1132         transport_verify_remote_names(refspec_nr, refspec);
1133
1134         if (transport->push) {
1135                 /* Maybe FIXME. But no important transport uses this case. */
1136                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1137                         die("This transport does not support using --set-upstream");
1138                 if (flags & TRANSPORT_PUSH_SET_PUBLISH)
1139                         die("This transport does not support using --set-publish");
1140
1141                 return transport->push(transport, refspec_nr, refspec, flags);
1142         } else if (transport->push_refs) {
1143                 struct ref *remote_refs =
1144                         transport->get_refs_list(transport, 1);
1145                 struct ref *local_refs = get_local_heads();
1146                 int match_flags = MATCH_REFS_NONE;
1147                 int verbose = (transport->verbose > 0);
1148                 int quiet = (transport->verbose < 0);
1149                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1150                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1151                 int push_ret, ret, err;
1152
1153                 if (flags & TRANSPORT_PUSH_ALL)
1154                         match_flags |= MATCH_REFS_ALL;
1155                 if (flags & TRANSPORT_PUSH_MIRROR)
1156                         match_flags |= MATCH_REFS_MIRROR;
1157                 if (flags & TRANSPORT_PUSH_PRUNE)
1158                         match_flags |= MATCH_REFS_PRUNE;
1159                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1160                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1161
1162                 if (match_push_refs(local_refs, &remote_refs,
1163                                     refspec_nr, refspec, match_flags)) {
1164                         return -1;
1165                 }
1166
1167                 if (transport->smart_options &&
1168                     transport->smart_options->cas &&
1169                     !is_empty_cas(transport->smart_options->cas))
1170                         apply_push_cas(transport->smart_options->cas,
1171                                        transport->remote, remote_refs);
1172
1173                 set_ref_status_for_push(remote_refs,
1174                         flags & TRANSPORT_PUSH_MIRROR,
1175                         flags & TRANSPORT_PUSH_FORCE);
1176
1177                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1178                         if (run_pre_push_hook(transport, remote_refs))
1179                                 return -1;
1180
1181                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1182                         struct ref *ref = remote_refs;
1183                         for (; ref; ref = ref->next)
1184                                 if (!is_null_sha1(ref->new_sha1) &&
1185                                     !push_unpushed_submodules(ref->new_sha1,
1186                                             transport->remote->name))
1187                                     die ("Failed to push all needed submodules!");
1188                 }
1189
1190                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1191                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1192                         struct ref *ref = remote_refs;
1193                         struct string_list needs_pushing;
1194
1195                         memset(&needs_pushing, 0, sizeof(struct string_list));
1196                         needs_pushing.strdup_strings = 1;
1197                         for (; ref; ref = ref->next)
1198                                 if (!is_null_sha1(ref->new_sha1) &&
1199                                     find_unpushed_submodules(ref->new_sha1,
1200                                             transport->remote->name, &needs_pushing))
1201                                         die_with_unpushed_submodules(&needs_pushing);
1202                 }
1203
1204                 push_ret = transport->push_refs(transport, remote_refs, flags);
1205                 err = push_had_errors(remote_refs);
1206                 ret = push_ret | err;
1207
1208                 if (!quiet || err)
1209                         transport_print_push_status(transport->url, remote_refs,
1210                                         verbose | porcelain, porcelain,
1211                                         reject_reasons);
1212
1213                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1214                         set_tracking(transport, remote_refs, pretend, 0);
1215                 if (flags & TRANSPORT_PUSH_SET_PUBLISH)
1216                         set_tracking(transport, remote_refs, pretend, 1);
1217
1218                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1219                         struct ref *ref;
1220                         for (ref = remote_refs; ref; ref = ref->next)
1221                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1222                 }
1223
1224                 if (porcelain && !push_ret)
1225                         puts("Done");
1226                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1227                         fprintf(stderr, "Everything up-to-date\n");
1228
1229                 return ret;
1230         }
1231         return 1;
1232 }
1233
1234 const struct ref *transport_get_remote_refs(struct transport *transport)
1235 {
1236         if (!transport->got_remote_refs) {
1237                 transport->remote_refs = transport->get_refs_list(transport, 0);
1238                 transport->got_remote_refs = 1;
1239         }
1240
1241         return transport->remote_refs;
1242 }
1243
1244 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1245 {
1246         int rc;
1247         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1248         struct ref **heads = NULL;
1249         struct ref *rm;
1250
1251         for (rm = refs; rm; rm = rm->next) {
1252                 nr_refs++;
1253                 if (rm->peer_ref &&
1254                     !is_null_sha1(rm->old_sha1) &&
1255                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1256                         continue;
1257                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1258                 heads[nr_heads++] = rm;
1259         }
1260
1261         if (!nr_heads) {
1262                 /*
1263                  * When deepening of a shallow repository is requested,
1264                  * then local and remote refs are likely to still be equal.
1265                  * Just feed them all to the fetch method in that case.
1266                  * This condition shouldn't be met in a non-deepening fetch
1267                  * (see builtin/fetch.c:quickfetch()).
1268                  */
1269                 heads = xmalloc(nr_refs * sizeof(*heads));
1270                 for (rm = refs; rm; rm = rm->next)
1271                         heads[nr_heads++] = rm;
1272         }
1273
1274         rc = transport->fetch(transport, nr_heads, heads);
1275
1276         free(heads);
1277         return rc;
1278 }
1279
1280 void transport_unlock_pack(struct transport *transport)
1281 {
1282         if (transport->pack_lockfile) {
1283                 unlink_or_warn(transport->pack_lockfile);
1284                 free(transport->pack_lockfile);
1285                 transport->pack_lockfile = NULL;
1286         }
1287 }
1288
1289 int transport_connect(struct transport *transport, const char *name,
1290                       const char *exec, int fd[2])
1291 {
1292         if (transport->connect)
1293                 return transport->connect(transport, name, exec, fd);
1294         else
1295                 die("Operation not supported by protocol");
1296 }
1297
1298 int transport_disconnect(struct transport *transport)
1299 {
1300         int ret = 0;
1301         if (transport->disconnect)
1302                 ret = transport->disconnect(transport);
1303         free(transport);
1304         return ret;
1305 }
1306
1307 /*
1308  * Strip username (and password) from a URL and return
1309  * it in a newly allocated string.
1310  */
1311 char *transport_anonymize_url(const char *url)
1312 {
1313         char *anon_url, *scheme_prefix, *anon_part;
1314         size_t anon_len, prefix_len = 0;
1315
1316         anon_part = strchr(url, '@');
1317         if (url_is_local_not_ssh(url) || !anon_part)
1318                 goto literal_copy;
1319
1320         anon_len = strlen(++anon_part);
1321         scheme_prefix = strstr(url, "://");
1322         if (!scheme_prefix) {
1323                 if (!strchr(anon_part, ':'))
1324                         /* cannot be "me@there:/path/name" */
1325                         goto literal_copy;
1326         } else {
1327                 const char *cp;
1328                 /* make sure scheme is reasonable */
1329                 for (cp = url; cp < scheme_prefix; cp++) {
1330                         switch (*cp) {
1331                                 /* RFC 1738 2.1 */
1332                         case '+': case '.': case '-':
1333                                 break; /* ok */
1334                         default:
1335                                 if (isalnum(*cp))
1336                                         break;
1337                                 /* it isn't */
1338                                 goto literal_copy;
1339                         }
1340                 }
1341                 /* @ past the first slash does not count */
1342                 cp = strchr(scheme_prefix + 3, '/');
1343                 if (cp && cp < anon_part)
1344                         goto literal_copy;
1345                 prefix_len = scheme_prefix - url + 3;
1346         }
1347         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1348         memcpy(anon_url, url, prefix_len);
1349         memcpy(anon_url + prefix_len, anon_part, anon_len);
1350         return anon_url;
1351 literal_copy:
1352         return xstrdup(url);
1353 }
1354
1355 struct alternate_refs_data {
1356         alternate_ref_fn *fn;
1357         void *data;
1358 };
1359
1360 static int refs_from_alternate_cb(struct alternate_object_database *e,
1361                                   void *data)
1362 {
1363         char *other;
1364         size_t len;
1365         struct remote *remote;
1366         struct transport *transport;
1367         const struct ref *extra;
1368         struct alternate_refs_data *cb = data;
1369
1370         e->name[-1] = '\0';
1371         other = xstrdup(real_path(e->base));
1372         e->name[-1] = '/';
1373         len = strlen(other);
1374
1375         while (other[len-1] == '/')
1376                 other[--len] = '\0';
1377         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1378                 return 0;
1379         /* Is this a git repository with refs? */
1380         memcpy(other + len - 8, "/refs", 6);
1381         if (!is_directory(other))
1382                 return 0;
1383         other[len - 8] = '\0';
1384         remote = remote_get(other);
1385         transport = transport_get(remote, other);
1386         for (extra = transport_get_remote_refs(transport);
1387              extra;
1388              extra = extra->next)
1389                 cb->fn(extra, cb->data);
1390         transport_disconnect(transport);
1391         free(other);
1392         return 0;
1393 }
1394
1395 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1396 {
1397         struct alternate_refs_data cb;
1398         cb.fn = fn;
1399         cb.data = data;
1400         foreach_alt_odb(refs_from_alternate_cb, &cb);
1401 }