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