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

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "run-command.h"
   4 #include "pkt-line.h"
   5 #include "fetch-pack.h"
   6 #include "remote.h"
   7 #include "connect.h"
   8 #include "send-pack.h"
   9 #include "walker.h"
  10 #include "bundle.h"
  11 #include "dir.h"
  12 #include "refs.h"
  13 #include "branch.h"
  14 #include "url.h"
  15 #include "submodule.h"
  16 #include "string-list.h"
  17 #include "sha1-array.h"
  18
  19 /* rsync support */
  20
  21 /*
  22  * We copy packed-refs and refs/ into a temporary file, then read the
  23  * loose refs recursively (sorting whenever possible), and then inserting
  24  * those packed refs that are not yet in the list (not validating, but
  25  * assuming that the file is sorted).
  26  *
  27  * Appears refactoring this from refs.c is too cumbersome.
  28  */
  29
  30 static int str_cmp(const void *a, const void *b)
  31 {
  32         const char *s1 = a;
  33         const char *s2 = b;
  34
  35         return strcmp(s1, s2);
  36 }
  37
  38 /* path->buf + name_offset is expected to point to "refs/" */
  39
  40 static int read_loose_refs(struct strbuf *path, int name_offset,
  41                 struct ref **tail)
  42 {
  43         DIR *dir = opendir(path->buf);
  44         struct dirent *de;
  45         struct {
  46                 char **entries;
  47                 int nr, alloc;
  48         } list;
  49         int i, pathlen;
  50
  51         if (!dir)
  52                 return -1;
  53
  54         memset (&list, 0, sizeof(list));
  55
  56         while ((de = readdir(dir))) {
  57                 if (is_dot_or_dotdot(de->d_name))
  58                         continue;
  59                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  60                 list.entries[list.nr++] = xstrdup(de->d_name);
  61         }
  62         closedir(dir);
  63
  64         /* sort the list */
  65
  66         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  67
  68         pathlen = path->len;
  69         strbuf_addch(path, '/');
  70
  71         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  72                 strbuf_addstr(path, list.entries[i]);
  73                 if (read_loose_refs(path, name_offset, tail)) {
  74                         int fd = open(path->buf, O_RDONLY);
  75                         char buffer[40];
  76                         struct ref *next;
  77
  78                         if (fd < 0)
  79                                 continue;
  80                         next = alloc_ref(path->buf + name_offset);
  81                         if (read_in_full(fd, buffer, 40) != 40 ||
  82                                         get_sha1_hex(buffer, next->old_sha1)) {
  83                                 close(fd);
  84                                 free(next);
  85                                 continue;
  86                         }
  87                         close(fd);
  88                         (*tail)->next = next;
  89                         *tail = next;
  90                 }
  91         }
  92         strbuf_setlen(path, pathlen);
  93
  94         for (i = 0; i < list.nr; i++)
  95                 free(list.entries[i]);
  96         free(list.entries);
  97
  98         return 0;
  99 }
 100
 101 /* insert the packed refs for which no loose refs were found */
 102
 103 static void insert_packed_refs(const char *packed_refs, struct ref **list)
 104 {
 105         FILE *f = fopen(packed_refs, "r");
 106         static char buffer[PATH_MAX];
 107
 108         if (!f)
 109                 return;
 110
 111         for (;;) {
 112                 int cmp = 0; /* assigned before used */
 113                 int len;
 114
 115                 if (!fgets(buffer, sizeof(buffer), f)) {
 116                         fclose(f);
 117                         return;
 118                 }
 119
 120                 if (hexval(buffer[0]) > 0xf)
 121                         continue;
 122                 len = strlen(buffer);
 123                 if (len && buffer[len - 1] == '\n')
 124                         buffer[--len] = '\0';
 125                 if (len < 41)
 126                         continue;
 127                 while ((*list)->next &&
 128                                 (cmp = strcmp(buffer + 41,
 129                                       (*list)->next->name)) > 0)
 130                         list = &(*list)->next;
 131                 if (!(*list)->next || cmp < 0) {
 132                         struct ref *next = alloc_ref(buffer + 41);
 133                         buffer[40] = '\0';
 134                         if (get_sha1_hex(buffer, next->old_sha1)) {
 135                                 warning ("invalid SHA-1: %s", buffer);
 136                                 free(next);
 137                                 continue;
 138                         }
 139                         next->next = (*list)->next;
 140                         (*list)->next = next;
 141                         list = &(*list)->next;
 142                 }
 143         }
 144 }
 145
 146 static void set_upstreams(struct transport *transport, struct ref *refs,
 147         int pretend)
 148 {
 149         struct ref *ref;
 150         for (ref = refs; ref; ref = ref->next) {
 151                 const char *localname;
 152                 const char *tmp;
 153                 const char *remotename;
 154                 unsigned char sha[20];
 155                 int flag = 0;
 156                 /*
 157                  * Check suitability for tracking. Must be successful /
 158                  * already up-to-date ref create/modify (not delete).
 159                  */
 160                 if (ref->status != REF_STATUS_OK &&
 161                         ref->status != REF_STATUS_UPTODATE)
 162                         continue;
 163                 if (!ref->peer_ref)
 164                         continue;
 165                 if (is_null_sha1(ref->new_sha1))
 166                         continue;
 167
 168                 /* Follow symbolic refs (mainly for HEAD). */
 169                 localname = ref->peer_ref->name;
 170                 remotename = ref->name;
 171                 tmp = resolve_ref_unsafe(localname, sha, 1, &flag);
 172                 if (tmp && flag & REF_ISSYMREF &&
 173                         starts_with(tmp, "refs/heads/"))
 174                         localname = tmp;
 175
 176                 /* Both source and destination must be local branches. */
 177                 if (!localname || !starts_with(localname, "refs/heads/"))
 178                         continue;
 179                 if (!remotename || !starts_with(remotename, "refs/heads/"))
 180                         continue;
 181
 182                 if (!pretend)
 183                         install_branch_config(BRANCH_CONFIG_VERBOSE,
 184                                 localname + 11, transport->remote->name,
 185                                 remotename);
 186                 else
 187                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
 188                                 localname + 11, remotename + 11,
 189                                 transport->remote->name);
 190         }
 191 }
 192
 193 static const char *rsync_url(const char *url)
 194 {
 195         if (!starts_with(url, "rsync://"))
 196                 skip_prefix(url, "rsync:", &url);
 197         return url;
 198 }
 199
 200 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 201 {
 202         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 203         struct ref dummy = {NULL}, *tail = &dummy;
 204         struct child_process rsync = CHILD_PROCESS_INIT;
 205         const char *args[5];
 206         int temp_dir_len;
 207
 208         if (for_push)
 209                 return NULL;
 210
 211         /* copy the refs to the temporary directory */
 212
 213         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 214         if (!mkdtemp(temp_dir.buf))
 215                 die_errno ("Could not make temporary directory");
 216         temp_dir_len = temp_dir.len;
 217
 218         strbuf_addstr(&buf, rsync_url(transport->url));
 219         strbuf_addstr(&buf, "/refs");
 220
 221         rsync.argv = args;
 222         rsync.stdout_to_stderr = 1;
 223         args[0] = "rsync";
 224         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 225         args[2] = buf.buf;
 226         args[3] = temp_dir.buf;
 227         args[4] = NULL;
 228
 229         if (run_command(&rsync))
 230                 die ("Could not run rsync to get refs");
 231
 232         strbuf_reset(&buf);
 233         strbuf_addstr(&buf, rsync_url(transport->url));
 234         strbuf_addstr(&buf, "/packed-refs");
 235
 236         args[2] = buf.buf;
 237
 238         if (run_command(&rsync))
 239                 die ("Could not run rsync to get refs");
 240
 241         /* read the copied refs */
 242
 243         strbuf_addstr(&temp_dir, "/refs");
 244         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 245         strbuf_setlen(&temp_dir, temp_dir_len);
 246
 247         tail = &dummy;
 248         strbuf_addstr(&temp_dir, "/packed-refs");
 249         insert_packed_refs(temp_dir.buf, &tail);
 250         strbuf_setlen(&temp_dir, temp_dir_len);
 251
 252         if (remove_dir_recursively(&temp_dir, 0))
 253                 warning ("Error removing temporary directory %s.",
 254                                 temp_dir.buf);
 255
 256         strbuf_release(&buf);
 257         strbuf_release(&temp_dir);
 258
 259         return dummy.next;
 260 }
 261
 262 static int fetch_objs_via_rsync(struct transport *transport,
 263                                 int nr_objs, struct ref **to_fetch)
 264 {
 265         struct child_process rsync = CHILD_PROCESS_INIT;
 266
 267         rsync.stdout_to_stderr = 1;
 268         argv_array_push(&rsync.args, "rsync");
 269         argv_array_push(&rsync.args, (transport->verbose > 1) ? "-rv" : "-r");
 270         argv_array_push(&rsync.args, "--ignore-existing");
 271         argv_array_push(&rsync.args, "--exclude");
 272         argv_array_push(&rsync.args, "info");
 273         argv_array_pushf(&rsync.args, "%s/objects/", rsync_url(transport->url));
 274         argv_array_push(&rsync.args, get_object_directory());
 275
 276         /* NEEDSWORK: handle one level of alternates */
 277         return run_command(&rsync);
 278 }
 279
 280 static int write_one_ref(const char *name, const unsigned char *sha1,
 281                 int flags, void *data)
 282 {
 283         struct strbuf *buf = data;
 284         int len = buf->len;
 285         FILE *f;
 286
 287         /* when called via for_each_ref(), flags is non-zero */
 288         if (flags && !starts_with(name, "refs/heads/") &&
 289                         !starts_with(name, "refs/tags/"))
 290                 return 0;
 291
 292         strbuf_addstr(buf, name);
 293         if (safe_create_leading_directories(buf->buf) ||
 294                         !(f = fopen(buf->buf, "w")) ||
 295                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 296                         fclose(f))
 297                 return error("problems writing temporary file %s", buf->buf);
 298         strbuf_setlen(buf, len);
 299         return 0;
 300 }
 301
 302 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 303                 int refspec_nr, const char **refspec)
 304 {
 305         int i;
 306
 307         for (i = 0; i < refspec_nr; i++) {
 308                 unsigned char sha1[20];
 309                 char *ref;
 310
 311                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 312                         return error("Could not get ref %s", refspec[i]);
 313
 314                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 315                         free(ref);
 316                         return -1;
 317                 }
 318                 free(ref);
 319         }
 320         return 0;
 321 }
 322
 323 static int rsync_transport_push(struct transport *transport,
 324                 int refspec_nr, const char **refspec, int flags)
 325 {
 326         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 327         int result = 0, i;
 328         struct child_process rsync = CHILD_PROCESS_INIT;
 329         const char *args[10];
 330
 331         if (flags & TRANSPORT_PUSH_MIRROR)
 332                 return error("rsync transport does not support mirror mode");
 333
 334         /* first push the objects */
 335
 336         strbuf_addstr(&buf, rsync_url(transport->url));
 337         strbuf_addch(&buf, '/');
 338
 339         rsync.argv = args;
 340         rsync.stdout_to_stderr = 1;
 341         i = 0;
 342         args[i++] = "rsync";
 343         args[i++] = "-a";
 344         if (flags & TRANSPORT_PUSH_DRY_RUN)
 345                 args[i++] = "--dry-run";
 346         if (transport->verbose > 1)
 347                 args[i++] = "-v";
 348         args[i++] = "--ignore-existing";
 349         args[i++] = "--exclude";
 350         args[i++] = "info";
 351         args[i++] = get_object_directory();
 352         args[i++] = buf.buf;
 353         args[i++] = NULL;
 354
 355         if (run_command(&rsync))
 356                 return error("Could not push objects to %s",
 357                                 rsync_url(transport->url));
 358
 359         /* copy the refs to the temporary directory; they could be packed. */
 360
 361         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 362         if (!mkdtemp(temp_dir.buf))
 363                 die_errno ("Could not make temporary directory");
 364         strbuf_addch(&temp_dir, '/');
 365
 366         if (flags & TRANSPORT_PUSH_ALL) {
 367                 if (for_each_ref(write_one_ref, &temp_dir))
 368                         return -1;
 369         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 370                 return -1;
 371
 372         i = 2;
 373         if (flags & TRANSPORT_PUSH_DRY_RUN)
 374                 args[i++] = "--dry-run";
 375         if (!(flags & TRANSPORT_PUSH_FORCE))
 376                 args[i++] = "--ignore-existing";
 377         args[i++] = temp_dir.buf;
 378         args[i++] = rsync_url(transport->url);
 379         args[i++] = NULL;
 380         if (run_command(&rsync))
 381                 result = error("Could not push to %s",
 382                                 rsync_url(transport->url));
 383
 384         if (remove_dir_recursively(&temp_dir, 0))
 385                 warning ("Could not remove temporary directory %s.",
 386                                 temp_dir.buf);
 387
 388         strbuf_release(&buf);
 389         strbuf_release(&temp_dir);
 390
 391         return result;
 392 }
 393
 394 struct bundle_transport_data {
 395         int fd;
 396         struct bundle_header header;
 397 };
 398
 399 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 400 {
 401         struct bundle_transport_data *data = transport->data;
 402         struct ref *result = NULL;
 403         int i;
 404
 405         if (for_push)
 406                 return NULL;
 407
 408         if (data->fd > 0)
 409                 close(data->fd);
 410         data->fd = read_bundle_header(transport->url, &data->header);
 411         if (data->fd < 0)
 412                 die ("Could not read bundle '%s'.", transport->url);
 413         for (i = 0; i < data->header.references.nr; i++) {
 414                 struct ref_list_entry *e = data->header.references.list + i;
 415                 struct ref *ref = alloc_ref(e->name);
 416                 hashcpy(ref->old_sha1, e->sha1);
 417                 ref->next = result;
 418                 result = ref;
 419         }
 420         return result;
 421 }
 422
 423 static int fetch_refs_from_bundle(struct transport *transport,
 424                                int nr_heads, struct ref **to_fetch)
 425 {
 426         struct bundle_transport_data *data = transport->data;
 427         return unbundle(&data->header, data->fd,
 428                         transport->progress ? BUNDLE_VERBOSE : 0);
 429 }
 430
 431 static int close_bundle(struct transport *transport)
 432 {
 433         struct bundle_transport_data *data = transport->data;
 434         if (data->fd > 0)
 435                 close(data->fd);
 436         free(data);
 437         return 0;
 438 }
 439
 440 struct git_transport_data {
 441         struct git_transport_options options;
 442         struct child_process *conn;
 443         int fd[2];
 444         unsigned got_remote_heads : 1;
 445         struct sha1_array extra_have;
 446         struct sha1_array shallow;
 447 };
 448
 449 static int set_git_option(struct git_transport_options *opts,
 450                           const char *name, const char *value)
 451 {
 452         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 453                 opts->uploadpack = value;
 454                 return 0;
 455         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 456                 opts->receivepack = value;
 457                 return 0;
 458         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 459                 opts->thin = !!value;
 460                 return 0;
 461         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 462                 opts->followtags = !!value;
 463                 return 0;
 464         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 465                 opts->keep = !!value;
 466                 return 0;
 467         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 468                 opts->update_shallow = !!value;
 469                 return 0;
 470         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 471                 if (!value)
 472                         opts->depth = 0;
 473                 else {
 474                         char *end;
 475                         opts->depth = strtol(value, &end, 0);
 476                         if (*end)
 477                                 die("transport: invalid depth option '%s'", value);
 478                 }
 479                 return 0;
 480         }
 481         return 1;
 482 }
 483
 484 static int connect_setup(struct transport *transport, int for_push, int verbose)
 485 {
 486         struct git_transport_data *data = transport->data;
 487
 488         if (data->conn)
 489                 return 0;
 490
 491         data->conn = git_connect(data->fd, transport->url,
 492                                  for_push ? data->options.receivepack :
 493                                  data->options.uploadpack,
 494                                  verbose ? CONNECT_VERBOSE : 0);
 495
 496         return 0;
 497 }
 498
 499 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 500 {
 501         struct git_transport_data *data = transport->data;
 502         struct ref *refs;
 503
 504         connect_setup(transport, for_push, 0);
 505         get_remote_heads(data->fd[0], NULL, 0, &refs,
 506                          for_push ? REF_NORMAL : 0,
 507                          &data->extra_have,
 508                          &data->shallow);
 509         data->got_remote_heads = 1;
 510
 511         return refs;
 512 }
 513
 514 static int fetch_refs_via_pack(struct transport *transport,
 515                                int nr_heads, struct ref **to_fetch)
 516 {
 517         struct git_transport_data *data = transport->data;
 518         const struct ref *refs;
 519         char *dest = xstrdup(transport->url);
 520         struct fetch_pack_args args;
 521         struct ref *refs_tmp = NULL;
 522
 523         memset(&args, 0, sizeof(args));
 524         args.uploadpack = data->options.uploadpack;
 525         args.keep_pack = data->options.keep;
 526         args.lock_pack = 1;
 527         args.use_thin_pack = data->options.thin;
 528         args.include_tag = data->options.followtags;
 529         args.verbose = (transport->verbose > 1);
 530         args.quiet = (transport->verbose < 0);
 531         args.no_progress = !transport->progress;
 532         args.depth = data->options.depth;
 533         args.check_self_contained_and_connected =
 534                 data->options.check_self_contained_and_connected;
 535         args.cloning = transport->cloning;
 536         args.update_shallow = data->options.update_shallow;
 537
 538         if (!data->got_remote_heads) {
 539                 connect_setup(transport, 0, 0);
 540                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 541                                  NULL, &data->shallow);
 542                 data->got_remote_heads = 1;
 543         }
 544
 545         refs = fetch_pack(&args, data->fd, data->conn,
 546                           refs_tmp ? refs_tmp : transport->remote_refs,
 547                           dest, to_fetch, nr_heads, &data->shallow,
 548                           &transport->pack_lockfile);
 549         close(data->fd[0]);
 550         close(data->fd[1]);
 551         if (finish_connect(data->conn))
 552                 refs = NULL;
 553         data->conn = NULL;
 554         data->got_remote_heads = 0;
 555         data->options.self_contained_and_connected =
 556                 args.self_contained_and_connected;
 557
 558         free_refs(refs_tmp);
 559
 560         free(dest);
 561         return (refs ? 0 : -1);
 562 }
 563
 564 static int push_had_errors(struct ref *ref)
 565 {
 566         for (; ref; ref = ref->next) {
 567                 switch (ref->status) {
 568                 case REF_STATUS_NONE:
 569                 case REF_STATUS_UPTODATE:
 570                 case REF_STATUS_OK:
 571                         break;
 572                 default:
 573                         return 1;
 574                 }
 575         }
 576         return 0;
 577 }
 578
 579 int transport_refs_pushed(struct ref *ref)
 580 {
 581         for (; ref; ref = ref->next) {
 582                 switch(ref->status) {
 583                 case REF_STATUS_NONE:
 584                 case REF_STATUS_UPTODATE:
 585                         break;
 586                 default:
 587                         return 1;
 588                 }
 589         }
 590         return 0;
 591 }
 592
 593 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 594 {
 595         struct refspec rs;
 596
 597         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 598                 return;
 599
 600         rs.src = ref->name;
 601         rs.dst = NULL;
 602
 603         if (!remote_find_tracking(remote, &rs)) {
 604                 if (verbose)
 605                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 606                 if (ref->deletion) {
 607                         delete_ref(rs.dst, NULL, 0);
 608                 } else
 609                         update_ref("update by push", rs.dst,
 610                                         ref->new_sha1, NULL, 0, 0);
 611                 free(rs.dst);
 612         }
 613 }
 614
 615 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 616 {
 617         if (porcelain) {
 618                 if (from)
 619                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 620                 else
 621                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 622                 if (msg)
 623                         fprintf(stdout, "%s (%s)\n", summary, msg);
 624                 else
 625                         fprintf(stdout, "%s\n", summary);
 626         } else {
 627                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 628                 if (from)
 629                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 630                 else
 631                         fputs(prettify_refname(to->name), stderr);
 632                 if (msg) {
 633                         fputs(" (", stderr);
 634                         fputs(msg, stderr);
 635                         fputc(')', stderr);
 636                 }
 637                 fputc('\n', stderr);
 638         }
 639 }
 640
 641 static const char *status_abbrev(unsigned char sha1[20])
 642 {
 643         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 644 }
 645
 646 static void print_ok_ref_status(struct ref *ref, int porcelain)
 647 {
 648         if (ref->deletion)
 649                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 650         else if (is_null_sha1(ref->old_sha1))
 651                 print_ref_status('*',
 652                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 653                         "[new branch]"),
 654                         ref, ref->peer_ref, NULL, porcelain);
 655         else {
 656                 char quickref[84];
 657                 char type;
 658                 const char *msg;
 659
 660                 strcpy(quickref, status_abbrev(ref->old_sha1));
 661                 if (ref->forced_update) {
 662                         strcat(quickref, "...");
 663                         type = '+';
 664                         msg = "forced update";
 665                 } else {
 666                         strcat(quickref, "..");
 667                         type = ' ';
 668                         msg = NULL;
 669                 }
 670                 strcat(quickref, status_abbrev(ref->new_sha1));
 671
 672                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 673         }
 674 }
 675
 676 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 677 {
 678         if (!count)
 679                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 680
 681         switch(ref->status) {
 682         case REF_STATUS_NONE:
 683                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 684                 break;
 685         case REF_STATUS_REJECT_NODELETE:
 686                 print_ref_status('!', "[rejected]", ref, NULL,
 687                                                  "remote does not support deleting refs", porcelain);
 688                 break;
 689         case REF_STATUS_UPTODATE:
 690                 print_ref_status('=', "[up to date]", ref,
 691                                                  ref->peer_ref, NULL, porcelain);
 692                 break;
 693         case REF_STATUS_REJECT_NONFASTFORWARD:
 694                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 695                                                  "non-fast-forward", porcelain);
 696                 break;
 697         case REF_STATUS_REJECT_ALREADY_EXISTS:
 698                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 699                                                  "already exists", porcelain);
 700                 break;
 701         case REF_STATUS_REJECT_FETCH_FIRST:
 702                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 703                                                  "fetch first", porcelain);
 704                 break;
 705         case REF_STATUS_REJECT_NEEDS_FORCE:
 706                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 707                                                  "needs force", porcelain);
 708                 break;
 709         case REF_STATUS_REJECT_STALE:
 710                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 711                                                  "stale info", porcelain);
 712                 break;
 713         case REF_STATUS_REJECT_SHALLOW:
 714                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 715                                                  "new shallow roots not allowed", porcelain);
 716                 break;
 717         case REF_STATUS_REMOTE_REJECT:
 718                 print_ref_status('!', "[remote rejected]", ref,
 719                                                  ref->deletion ? NULL : ref->peer_ref,
 720                                                  ref->remote_status, porcelain);
 721                 break;
 722         case REF_STATUS_EXPECTING_REPORT:
 723                 print_ref_status('!', "[remote failure]", ref,
 724                                                  ref->deletion ? NULL : ref->peer_ref,
 725                                                  "remote failed to report status", porcelain);
 726                 break;
 727         case REF_STATUS_OK:
 728                 print_ok_ref_status(ref, porcelain);
 729                 break;
 730         }
 731
 732         return 1;
 733 }
 734
 735 void transport_print_push_status(const char *dest, struct ref *refs,
 736                                   int verbose, int porcelain, unsigned int *reject_reasons)
 737 {
 738         struct ref *ref;
 739         int n = 0;
 740         unsigned char head_sha1[20];
 741         char *head;
 742
 743         head = resolve_refdup("HEAD", head_sha1, 1, NULL);
 744
 745         if (verbose) {
 746                 for (ref = refs; ref; ref = ref->next)
 747                         if (ref->status == REF_STATUS_UPTODATE)
 748                                 n += print_one_push_status(ref, dest, n, porcelain);
 749         }
 750
 751         for (ref = refs; ref; ref = ref->next)
 752                 if (ref->status == REF_STATUS_OK)
 753                         n += print_one_push_status(ref, dest, n, porcelain);
 754
 755         *reject_reasons = 0;
 756         for (ref = refs; ref; ref = ref->next) {
 757                 if (ref->status != REF_STATUS_NONE &&
 758                     ref->status != REF_STATUS_UPTODATE &&
 759                     ref->status != REF_STATUS_OK)
 760                         n += print_one_push_status(ref, dest, n, porcelain);
 761                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 762                         if (head != NULL && !strcmp(head, ref->name))
 763                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 764                         else
 765                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 766                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 767                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 768                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 769                         *reject_reasons |= REJECT_FETCH_FIRST;
 770                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 771                         *reject_reasons |= REJECT_NEEDS_FORCE;
 772                 }
 773         }
 774 }
 775
 776 void transport_verify_remote_names(int nr_heads, const char **heads)
 777 {
 778         int i;
 779
 780         for (i = 0; i < nr_heads; i++) {
 781                 const char *local = heads[i];
 782                 const char *remote = strrchr(heads[i], ':');
 783
 784                 if (*local == '+')
 785                         local++;
 786
 787                 /* A matching refspec is okay.  */
 788                 if (remote == local && remote[1] == '\0')
 789                         continue;
 790
 791                 remote = remote ? (remote + 1) : local;
 792                 if (check_refname_format(remote,
 793                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 794                         die("remote part of refspec is not a valid name in %s",
 795                                 heads[i]);
 796         }
 797 }
 798
 799 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 800 {
 801         struct git_transport_data *data = transport->data;
 802         struct send_pack_args args;
 803         int ret;
 804
 805         if (!data->got_remote_heads) {
 806                 struct ref *tmp_refs;
 807                 connect_setup(transport, 1, 0);
 808
 809                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 810                                  NULL, &data->shallow);
 811                 data->got_remote_heads = 1;
 812         }
 813
 814         memset(&args, 0, sizeof(args));
 815         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 816         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 817         args.use_thin_pack = data->options.thin;
 818         args.verbose = (transport->verbose > 0);
 819         args.quiet = (transport->verbose < 0);
 820         args.progress = transport->progress;
 821         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 822         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 823
 824         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 825                         &data->extra_have);
 826
 827         close(data->fd[1]);
 828         close(data->fd[0]);
 829         ret |= finish_connect(data->conn);
 830         data->conn = NULL;
 831         data->got_remote_heads = 0;
 832
 833         return ret;
 834 }
 835
 836 static int connect_git(struct transport *transport, const char *name,
 837                        const char *executable, int fd[2])
 838 {
 839         struct git_transport_data *data = transport->data;
 840         data->conn = git_connect(data->fd, transport->url,
 841                                  executable, 0);
 842         fd[0] = data->fd[0];
 843         fd[1] = data->fd[1];
 844         return 0;
 845 }
 846
 847 static int disconnect_git(struct transport *transport)
 848 {
 849         struct git_transport_data *data = transport->data;
 850         if (data->conn) {
 851                 if (data->got_remote_heads)
 852                         packet_flush(data->fd[1]);
 853                 close(data->fd[0]);
 854                 close(data->fd[1]);
 855                 finish_connect(data->conn);
 856         }
 857
 858         free(data);
 859         return 0;
 860 }
 861
 862 void transport_take_over(struct transport *transport,
 863                          struct child_process *child)
 864 {
 865         struct git_transport_data *data;
 866
 867         if (!transport->smart_options)
 868                 die("Bug detected: Taking over transport requires non-NULL "
 869                     "smart_options field.");
 870
 871         data = xcalloc(1, sizeof(*data));
 872         data->options = *transport->smart_options;
 873         data->conn = child;
 874         data->fd[0] = data->conn->out;
 875         data->fd[1] = data->conn->in;
 876         data->got_remote_heads = 0;
 877         transport->data = data;
 878
 879         transport->set_option = NULL;
 880         transport->get_refs_list = get_refs_via_connect;
 881         transport->fetch = fetch_refs_via_pack;
 882         transport->push = NULL;
 883         transport->push_refs = git_transport_push;
 884         transport->disconnect = disconnect_git;
 885         transport->smart_options = &(data->options);
 886
 887         transport->cannot_reuse = 1;
 888 }
 889
 890 static int is_file(const char *url)
 891 {
 892         struct stat buf;
 893         if (stat(url, &buf))
 894                 return 0;
 895         return S_ISREG(buf.st_mode);
 896 }
 897
 898 static int external_specification_len(const char *url)
 899 {
 900         return strchr(url, ':') - url;
 901 }
 902
 903 struct transport *transport_get(struct remote *remote, const char *url)
 904 {
 905         const char *helper;
 906         struct transport *ret = xcalloc(1, sizeof(*ret));
 907
 908         ret->progress = isatty(2);
 909
 910         if (!remote)
 911                 die("No remote provided to transport_get()");
 912
 913         ret->got_remote_refs = 0;
 914         ret->remote = remote;
 915         helper = remote->foreign_vcs;
 916
 917         if (!url && remote->url)
 918                 url = remote->url[0];
 919         ret->url = url;
 920
 921         /* maybe it is a foreign URL? */
 922         if (url) {
 923                 const char *p = url;
 924
 925                 while (is_urlschemechar(p == url, *p))
 926                         p++;
 927                 if (starts_with(p, "::"))
 928                         helper = xstrndup(url, p - url);
 929         }
 930
 931         if (helper) {
 932                 transport_helper_init(ret, helper);
 933         } else if (starts_with(url, "rsync:")) {
 934                 ret->get_refs_list = get_refs_via_rsync;
 935                 ret->fetch = fetch_objs_via_rsync;
 936                 ret->push = rsync_transport_push;
 937                 ret->smart_options = NULL;
 938         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 939                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 940                 ret->data = data;
 941                 ret->get_refs_list = get_refs_from_bundle;
 942                 ret->fetch = fetch_refs_from_bundle;
 943                 ret->disconnect = close_bundle;
 944                 ret->smart_options = NULL;
 945         } else if (!is_url(url)
 946                 || starts_with(url, "file://")
 947                 || starts_with(url, "git://")
 948                 || starts_with(url, "ssh://")
 949                 || starts_with(url, "git+ssh://")
 950                 || starts_with(url, "ssh+git://")) {
 951                 /* These are builtin smart transports. */
 952                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 953                 ret->data = data;
 954                 ret->set_option = NULL;
 955                 ret->get_refs_list = get_refs_via_connect;
 956                 ret->fetch = fetch_refs_via_pack;
 957                 ret->push_refs = git_transport_push;
 958                 ret->connect = connect_git;
 959                 ret->disconnect = disconnect_git;
 960                 ret->smart_options = &(data->options);
 961
 962                 data->conn = NULL;
 963                 data->got_remote_heads = 0;
 964         } else {
 965                 /* Unknown protocol in URL. Pass to external handler. */
 966                 int len = external_specification_len(url);
 967                 char *handler = xmalloc(len + 1);
 968                 handler[len] = 0;
 969                 strncpy(handler, url, len);
 970                 transport_helper_init(ret, handler);
 971         }
 972
 973         if (ret->smart_options) {
 974                 ret->smart_options->thin = 1;
 975                 ret->smart_options->uploadpack = "git-upload-pack";
 976                 if (remote->uploadpack)
 977                         ret->smart_options->uploadpack = remote->uploadpack;
 978                 ret->smart_options->receivepack = "git-receive-pack";
 979                 if (remote->receivepack)
 980                         ret->smart_options->receivepack = remote->receivepack;
 981         }
 982
 983         return ret;
 984 }
 985
 986 int transport_set_option(struct transport *transport,
 987                          const char *name, const char *value)
 988 {
 989         int git_reports = 1, protocol_reports = 1;
 990
 991         if (transport->smart_options)
 992                 git_reports = set_git_option(transport->smart_options,
 993                                              name, value);
 994
 995         if (transport->set_option)
 996                 protocol_reports = transport->set_option(transport, name,
 997                                                         value);
 998
 999         /* If either report is 0, report 0 (success). */
1000         if (!git_reports || !protocol_reports)
1001                 return 0;
1002         /* If either reports -1 (invalid value), report -1. */
1003         if ((git_reports == -1) || (protocol_reports == -1))
1004                 return -1;
1005         /* Otherwise if both report unknown, report unknown. */
1006         return 1;
1007 }
1008
1009 void transport_set_verbosity(struct transport *transport, int verbosity,
1010         int force_progress)
1011 {
1012         if (verbosity >= 1)
1013                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1014         if (verbosity < 0)
1015                 transport->verbose = -1;
1016
1017         /**
1018          * Rules used to determine whether to report progress (processing aborts
1019          * when a rule is satisfied):
1020          *
1021          *   . Report progress, if force_progress is 1 (ie. --progress).
1022          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1023          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1024          *   . Report progress if isatty(2) is 1.
1025          **/
1026         if (force_progress >= 0)
1027                 transport->progress = !!force_progress;
1028         else
1029                 transport->progress = verbosity >= 0 && isatty(2);
1030 }
1031
1032 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1033 {
1034         int i;
1035
1036         fprintf(stderr, "The following submodule paths contain changes that can\n"
1037                         "not be found on any remote:\n");
1038         for (i = 0; i < needs_pushing->nr; i++)
1039                 printf("  %s\n", needs_pushing->items[i].string);
1040         fprintf(stderr, "\nPlease try\n\n"
1041                         "       git push --recurse-submodules=on-demand\n\n"
1042                         "or cd to the path and use\n\n"
1043                         "       git push\n\n"
1044                         "to push them to a remote.\n\n");
1045
1046         string_list_clear(needs_pushing, 0);
1047
1048         die("Aborting.");
1049 }
1050
1051 static int run_pre_push_hook(struct transport *transport,
1052                              struct ref *remote_refs)
1053 {
1054         int ret = 0, x;
1055         struct ref *r;
1056         struct child_process proc = CHILD_PROCESS_INIT;
1057         struct strbuf buf;
1058         const char *argv[4];
1059
1060         if (!(argv[0] = find_hook("pre-push")))
1061                 return 0;
1062
1063         argv[1] = transport->remote->name;
1064         argv[2] = transport->url;
1065         argv[3] = NULL;
1066
1067         proc.argv = argv;
1068         proc.in = -1;
1069
1070         if (start_command(&proc)) {
1071                 finish_command(&proc);
1072                 return -1;
1073         }
1074
1075         strbuf_init(&buf, 256);
1076
1077         for (r = remote_refs; r; r = r->next) {
1078                 if (!r->peer_ref) continue;
1079                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1080                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1081                 if (r->status == REF_STATUS_UPTODATE) continue;
1082
1083                 strbuf_reset(&buf);
1084                 strbuf_addf( &buf, "%s %s %s %s\n",
1085                          r->peer_ref->name, sha1_to_hex(r->new_sha1),
1086                          r->name, sha1_to_hex(r->old_sha1));
1087
1088                 if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1089                         ret = -1;
1090                         break;
1091                 }
1092         }
1093
1094         strbuf_release(&buf);
1095
1096         x = close(proc.in);
1097         if (!ret)
1098                 ret = x;
1099
1100         x = finish_command(&proc);
1101         if (!ret)
1102                 ret = x;
1103
1104         return ret;
1105 }
1106
1107 int transport_push(struct transport *transport,
1108                    int refspec_nr, const char **refspec, int flags,
1109                    unsigned int *reject_reasons)
1110 {
1111         *reject_reasons = 0;
1112         transport_verify_remote_names(refspec_nr, refspec);
1113
1114         if (transport->push) {
1115                 /* Maybe FIXME. But no important transport uses this case. */
1116                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1117                         die("This transport does not support using --set-upstream");
1118
1119                 return transport->push(transport, refspec_nr, refspec, flags);
1120         } else if (transport->push_refs) {
1121                 struct ref *remote_refs;
1122                 struct ref *local_refs = get_local_heads();
1123                 int match_flags = MATCH_REFS_NONE;
1124                 int verbose = (transport->verbose > 0);
1125                 int quiet = (transport->verbose < 0);
1126                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1127                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1128                 int push_ret, ret, err;
1129
1130                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1131                         return -1;
1132
1133                 remote_refs = transport->get_refs_list(transport, 1);
1134
1135                 if (flags & TRANSPORT_PUSH_ALL)
1136                         match_flags |= MATCH_REFS_ALL;
1137                 if (flags & TRANSPORT_PUSH_MIRROR)
1138                         match_flags |= MATCH_REFS_MIRROR;
1139                 if (flags & TRANSPORT_PUSH_PRUNE)
1140                         match_flags |= MATCH_REFS_PRUNE;
1141                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1142                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1143
1144                 if (match_push_refs(local_refs, &remote_refs,
1145                                     refspec_nr, refspec, match_flags)) {
1146                         return -1;
1147                 }
1148
1149                 if (transport->smart_options &&
1150                     transport->smart_options->cas &&
1151                     !is_empty_cas(transport->smart_options->cas))
1152                         apply_push_cas(transport->smart_options->cas,
1153                                        transport->remote, remote_refs);
1154
1155                 set_ref_status_for_push(remote_refs,
1156                         flags & TRANSPORT_PUSH_MIRROR,
1157                         flags & TRANSPORT_PUSH_FORCE);
1158
1159                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1160                         if (run_pre_push_hook(transport, remote_refs))
1161                                 return -1;
1162
1163                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1164                         struct ref *ref = remote_refs;
1165                         for (; ref; ref = ref->next)
1166                                 if (!is_null_sha1(ref->new_sha1) &&
1167                                     !push_unpushed_submodules(ref->new_sha1,
1168                                             transport->remote->name))
1169                                     die ("Failed to push all needed submodules!");
1170                 }
1171
1172                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1173                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1174                         struct ref *ref = remote_refs;
1175                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1176
1177                         for (; ref; ref = ref->next)
1178                                 if (!is_null_sha1(ref->new_sha1) &&
1179                                     find_unpushed_submodules(ref->new_sha1,
1180                                             transport->remote->name, &needs_pushing))
1181                                         die_with_unpushed_submodules(&needs_pushing);
1182                 }
1183
1184                 push_ret = transport->push_refs(transport, remote_refs, flags);
1185                 err = push_had_errors(remote_refs);
1186                 ret = push_ret | err;
1187
1188                 if (!quiet || err)
1189                         transport_print_push_status(transport->url, remote_refs,
1190                                         verbose | porcelain, porcelain,
1191                                         reject_reasons);
1192
1193                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1194                         set_upstreams(transport, remote_refs, pretend);
1195
1196                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1197                         struct ref *ref;
1198                         for (ref = remote_refs; ref; ref = ref->next)
1199                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1200                 }
1201
1202                 if (porcelain && !push_ret)
1203                         puts("Done");
1204                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1205                         fprintf(stderr, "Everything up-to-date\n");
1206
1207                 return ret;
1208         }
1209         return 1;
1210 }
1211
1212 const struct ref *transport_get_remote_refs(struct transport *transport)
1213 {
1214         if (!transport->got_remote_refs) {
1215                 transport->remote_refs = transport->get_refs_list(transport, 0);
1216                 transport->got_remote_refs = 1;
1217         }
1218
1219         return transport->remote_refs;
1220 }
1221
1222 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1223 {
1224         int rc;
1225         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1226         struct ref **heads = NULL;
1227         struct ref *rm;
1228
1229         for (rm = refs; rm; rm = rm->next) {
1230                 nr_refs++;
1231                 if (rm->peer_ref &&
1232                     !is_null_sha1(rm->old_sha1) &&
1233                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1234                         continue;
1235                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1236                 heads[nr_heads++] = rm;
1237         }
1238
1239         if (!nr_heads) {
1240                 /*
1241                  * When deepening of a shallow repository is requested,
1242                  * then local and remote refs are likely to still be equal.
1243                  * Just feed them all to the fetch method in that case.
1244                  * This condition shouldn't be met in a non-deepening fetch
1245                  * (see builtin/fetch.c:quickfetch()).
1246                  */
1247                 heads = xmalloc(nr_refs * sizeof(*heads));
1248                 for (rm = refs; rm; rm = rm->next)
1249                         heads[nr_heads++] = rm;
1250         }
1251
1252         rc = transport->fetch(transport, nr_heads, heads);
1253
1254         free(heads);
1255         return rc;
1256 }
1257
1258 void transport_unlock_pack(struct transport *transport)
1259 {
1260         if (transport->pack_lockfile) {
1261                 unlink_or_warn(transport->pack_lockfile);
1262                 free(transport->pack_lockfile);
1263                 transport->pack_lockfile = NULL;
1264         }
1265 }
1266
1267 int transport_connect(struct transport *transport, const char *name,
1268                       const char *exec, int fd[2])
1269 {
1270         if (transport->connect)
1271                 return transport->connect(transport, name, exec, fd);
1272         else
1273                 die("Operation not supported by protocol");
1274 }
1275
1276 int transport_disconnect(struct transport *transport)
1277 {
1278         int ret = 0;
1279         if (transport->disconnect)
1280                 ret = transport->disconnect(transport);
1281         free(transport);
1282         return ret;
1283 }
1284
1285 /*
1286  * Strip username (and password) from a URL and return
1287  * it in a newly allocated string.
1288  */
1289 char *transport_anonymize_url(const char *url)
1290 {
1291         char *anon_url, *scheme_prefix, *anon_part;
1292         size_t anon_len, prefix_len = 0;
1293
1294         anon_part = strchr(url, '@');
1295         if (url_is_local_not_ssh(url) || !anon_part)
1296                 goto literal_copy;
1297
1298         anon_len = strlen(++anon_part);
1299         scheme_prefix = strstr(url, "://");
1300         if (!scheme_prefix) {
1301                 if (!strchr(anon_part, ':'))
1302                         /* cannot be "me@there:/path/name" */
1303                         goto literal_copy;
1304         } else {
1305                 const char *cp;
1306                 /* make sure scheme is reasonable */
1307                 for (cp = url; cp < scheme_prefix; cp++) {
1308                         switch (*cp) {
1309                                 /* RFC 1738 2.1 */
1310                         case '+': case '.': case '-':
1311                                 break; /* ok */
1312                         default:
1313                                 if (isalnum(*cp))
1314                                         break;
1315                                 /* it isn't */
1316                                 goto literal_copy;
1317                         }
1318                 }
1319                 /* @ past the first slash does not count */
1320                 cp = strchr(scheme_prefix + 3, '/');
1321                 if (cp && cp < anon_part)
1322                         goto literal_copy;
1323                 prefix_len = scheme_prefix - url + 3;
1324         }
1325         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1326         memcpy(anon_url, url, prefix_len);
1327         memcpy(anon_url + prefix_len, anon_part, anon_len);
1328         return anon_url;
1329 literal_copy:
1330         return xstrdup(url);
1331 }
1332
1333 struct alternate_refs_data {
1334         alternate_ref_fn *fn;
1335         void *data;
1336 };
1337
1338 static int refs_from_alternate_cb(struct alternate_object_database *e,
1339                                   void *data)
1340 {
1341         char *other;
1342         size_t len;
1343         struct remote *remote;
1344         struct transport *transport;
1345         const struct ref *extra;
1346         struct alternate_refs_data *cb = data;
1347
1348         e->name[-1] = '\0';
1349         other = xstrdup(real_path(e->base));
1350         e->name[-1] = '/';
1351         len = strlen(other);
1352
1353         while (other[len-1] == '/')
1354                 other[--len] = '\0';
1355         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1356                 goto out;
1357         /* Is this a git repository with refs? */
1358         memcpy(other + len - 8, "/refs", 6);
1359         if (!is_directory(other))
1360                 goto out;
1361         other[len - 8] = '\0';
1362         remote = remote_get(other);
1363         transport = transport_get(remote, other);
1364         for (extra = transport_get_remote_refs(transport);
1365              extra;
1366              extra = extra->next)
1367                 cb->fn(extra, cb->data);
1368         transport_disconnect(transport);
1369 out:
1370         free(other);
1371         return 0;
1372 }
1373
1374 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1375 {
1376         struct alternate_refs_data cb;
1377         cb.fn = fn;
1378         cb.data = data;
1379         foreach_alt_odb(refs_from_alternate_cb, &cb);
1380 }