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 #include "sigchain.h"
  19
  20 /* rsync support */
  21
  22 /*
  23  * We copy packed-refs and refs/ into a temporary file, then read the
  24  * loose refs recursively (sorting whenever possible), and then inserting
  25  * those packed refs that are not yet in the list (not validating, but
  26  * assuming that the file is sorted).
  27  *
  28  * Appears refactoring this from refs.c is too cumbersome.
  29  */
  30
  31 static int str_cmp(const void *a, const void *b)
  32 {
  33         const char *s1 = a;
  34         const char *s2 = b;
  35
  36         return strcmp(s1, s2);
  37 }
  38
  39 /* path->buf + name_offset is expected to point to "refs/" */
  40
  41 static int read_loose_refs(struct strbuf *path, int name_offset,
  42                 struct ref **tail)
  43 {
  44         DIR *dir = opendir(path->buf);
  45         struct dirent *de;
  46         struct {
  47                 char **entries;
  48                 int nr, alloc;
  49         } list;
  50         int i, pathlen;
  51
  52         if (!dir)
  53                 return -1;
  54
  55         memset (&list, 0, sizeof(list));
  56
  57         while ((de = readdir(dir))) {
  58                 if (is_dot_or_dotdot(de->d_name))
  59                         continue;
  60                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  61                 list.entries[list.nr++] = xstrdup(de->d_name);
  62         }
  63         closedir(dir);
  64
  65         /* sort the list */
  66
  67         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  68
  69         pathlen = path->len;
  70         strbuf_addch(path, '/');
  71
  72         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  73                 strbuf_addstr(path, list.entries[i]);
  74                 if (read_loose_refs(path, name_offset, tail)) {
  75                         int fd = open(path->buf, O_RDONLY);
  76                         char buffer[40];
  77                         struct ref *next;
  78
  79                         if (fd < 0)
  80                                 continue;
  81                         next = alloc_ref(path->buf + name_offset);
  82                         if (read_in_full(fd, buffer, 40) != 40 ||
  83                                         get_oid_hex(buffer, &next->old_oid)) {
  84                                 close(fd);
  85                                 free(next);
  86                                 continue;
  87                         }
  88                         close(fd);
  89                         (*tail)->next = next;
  90                         *tail = next;
  91                 }
  92         }
  93         strbuf_setlen(path, pathlen);
  94
  95         for (i = 0; i < list.nr; i++)
  96                 free(list.entries[i]);
  97         free(list.entries);
  98
  99         return 0;
 100 }
 101
 102 /* insert the packed refs for which no loose refs were found */
 103
 104 static void insert_packed_refs(const char *packed_refs, struct ref **list)
 105 {
 106         FILE *f = fopen(packed_refs, "r");
 107         static char buffer[PATH_MAX];
 108
 109         if (!f)
 110                 return;
 111
 112         for (;;) {
 113                 int cmp = 0; /* assigned before used */
 114                 int len;
 115
 116                 if (!fgets(buffer, sizeof(buffer), f)) {
 117                         fclose(f);
 118                         return;
 119                 }
 120
 121                 if (!isxdigit(buffer[0]))
 122                         continue;
 123                 len = strlen(buffer);
 124                 if (len && buffer[len - 1] == '\n')
 125                         buffer[--len] = '\0';
 126                 if (len < 41)
 127                         continue;
 128                 while ((*list)->next &&
 129                                 (cmp = strcmp(buffer + 41,
 130                                       (*list)->next->name)) > 0)
 131                         list = &(*list)->next;
 132                 if (!(*list)->next || cmp < 0) {
 133                         struct ref *next = alloc_ref(buffer + 41);
 134                         buffer[40] = '\0';
 135                         if (get_oid_hex(buffer, &next->old_oid)) {
 136                                 warning ("invalid SHA-1: %s", buffer);
 137                                 free(next);
 138                                 continue;
 139                         }
 140                         next->next = (*list)->next;
 141                         (*list)->next = next;
 142                         list = &(*list)->next;
 143                 }
 144         }
 145 }
 146
 147 static void set_upstreams(struct transport *transport, struct ref *refs,
 148         int pretend)
 149 {
 150         struct ref *ref;
 151         for (ref = refs; ref; ref = ref->next) {
 152                 const char *localname;
 153                 const char *tmp;
 154                 const char *remotename;
 155                 unsigned char sha[20];
 156                 int flag = 0;
 157                 /*
 158                  * Check suitability for tracking. Must be successful /
 159                  * already up-to-date ref create/modify (not delete).
 160                  */
 161                 if (ref->status != REF_STATUS_OK &&
 162                         ref->status != REF_STATUS_UPTODATE)
 163                         continue;
 164                 if (!ref->peer_ref)
 165                         continue;
 166                 if (is_null_oid(&ref->new_oid))
 167                         continue;
 168
 169                 /* Follow symbolic refs (mainly for HEAD). */
 170                 localname = ref->peer_ref->name;
 171                 remotename = ref->name;
 172                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
 173                                          sha, &flag);
 174                 if (tmp && flag & REF_ISSYMREF &&
 175                         starts_with(tmp, "refs/heads/"))
 176                         localname = tmp;
 177
 178                 /* Both source and destination must be local branches. */
 179                 if (!localname || !starts_with(localname, "refs/heads/"))
 180                         continue;
 181                 if (!remotename || !starts_with(remotename, "refs/heads/"))
 182                         continue;
 183
 184                 if (!pretend)
 185                         install_branch_config(BRANCH_CONFIG_VERBOSE,
 186                                 localname + 11, transport->remote->name,
 187                                 remotename);
 188                 else
 189                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
 190                                 localname + 11, remotename + 11,
 191                                 transport->remote->name);
 192         }
 193 }
 194
 195 static const char *rsync_url(const char *url)
 196 {
 197         if (!starts_with(url, "rsync://"))
 198                 skip_prefix(url, "rsync:", &url);
 199         return url;
 200 }
 201
 202 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 203 {
 204         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 205         struct ref dummy = {NULL}, *tail = &dummy;
 206         struct child_process rsync = CHILD_PROCESS_INIT;
 207         const char *args[5];
 208         int temp_dir_len;
 209
 210         if (for_push)
 211                 return NULL;
 212
 213         /* copy the refs to the temporary directory */
 214
 215         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 216         if (!mkdtemp(temp_dir.buf))
 217                 die_errno ("Could not make temporary directory");
 218         temp_dir_len = temp_dir.len;
 219
 220         strbuf_addstr(&buf, rsync_url(transport->url));
 221         strbuf_addstr(&buf, "/refs");
 222
 223         rsync.argv = args;
 224         rsync.stdout_to_stderr = 1;
 225         args[0] = "rsync";
 226         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 227         args[2] = buf.buf;
 228         args[3] = temp_dir.buf;
 229         args[4] = NULL;
 230
 231         if (run_command(&rsync))
 232                 die ("Could not run rsync to get refs");
 233
 234         strbuf_reset(&buf);
 235         strbuf_addstr(&buf, rsync_url(transport->url));
 236         strbuf_addstr(&buf, "/packed-refs");
 237
 238         args[2] = buf.buf;
 239
 240         if (run_command(&rsync))
 241                 die ("Could not run rsync to get refs");
 242
 243         /* read the copied refs */
 244
 245         strbuf_addstr(&temp_dir, "/refs");
 246         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 247         strbuf_setlen(&temp_dir, temp_dir_len);
 248
 249         tail = &dummy;
 250         strbuf_addstr(&temp_dir, "/packed-refs");
 251         insert_packed_refs(temp_dir.buf, &tail);
 252         strbuf_setlen(&temp_dir, temp_dir_len);
 253
 254         if (remove_dir_recursively(&temp_dir, 0))
 255                 warning ("Error removing temporary directory %s.",
 256                                 temp_dir.buf);
 257
 258         strbuf_release(&buf);
 259         strbuf_release(&temp_dir);
 260
 261         return dummy.next;
 262 }
 263
 264 static int fetch_objs_via_rsync(struct transport *transport,
 265                                 int nr_objs, struct ref **to_fetch)
 266 {
 267         struct child_process rsync = CHILD_PROCESS_INIT;
 268
 269         rsync.stdout_to_stderr = 1;
 270         argv_array_push(&rsync.args, "rsync");
 271         argv_array_push(&rsync.args, (transport->verbose > 1) ? "-rv" : "-r");
 272         argv_array_push(&rsync.args, "--ignore-existing");
 273         argv_array_push(&rsync.args, "--exclude");
 274         argv_array_push(&rsync.args, "info");
 275         argv_array_pushf(&rsync.args, "%s/objects/", rsync_url(transport->url));
 276         argv_array_push(&rsync.args, get_object_directory());
 277
 278         /* NEEDSWORK: handle one level of alternates */
 279         return run_command(&rsync);
 280 }
 281
 282 static int write_one_ref(const char *name, const struct object_id *oid,
 283                          int flags, void *data)
 284 {
 285         struct strbuf *buf = data;
 286         int len = buf->len;
 287
 288         /* when called via for_each_ref(), flags is non-zero */
 289         if (flags && !starts_with(name, "refs/heads/") &&
 290                         !starts_with(name, "refs/tags/"))
 291                 return 0;
 292
 293         strbuf_addstr(buf, name);
 294         if (safe_create_leading_directories(buf->buf) ||
 295             write_file_gently(buf->buf, "%s", oid_to_hex(oid)))
 296                 return error("problems writing temporary file %s: %s",
 297                              buf->buf, strerror(errno));
 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                 struct object_id oid;
 309                 char *ref;
 310
 311                 if (dwim_ref(refspec[i], strlen(refspec[i]), oid.hash, &ref) != 1)
 312                         return error("Could not get ref %s", refspec[i]);
 313
 314                 if (write_one_ref(ref, &oid, 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_oid.hash, 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)
 485 {
 486         struct git_transport_data *data = transport->data;
 487         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 488
 489         if (data->conn)
 490                 return 0;
 491
 492         switch (transport->family) {
 493         case TRANSPORT_FAMILY_ALL: break;
 494         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 495         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 496         }
 497
 498         data->conn = git_connect(data->fd, transport->url,
 499                                  for_push ? data->options.receivepack :
 500                                  data->options.uploadpack,
 501                                  flags);
 502
 503         return 0;
 504 }
 505
 506 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 507 {
 508         struct git_transport_data *data = transport->data;
 509         struct ref *refs;
 510
 511         connect_setup(transport, for_push);
 512         get_remote_heads(data->fd[0], NULL, 0, &refs,
 513                          for_push ? REF_NORMAL : 0,
 514                          &data->extra_have,
 515                          &data->shallow);
 516         data->got_remote_heads = 1;
 517
 518         return refs;
 519 }
 520
 521 static int fetch_refs_via_pack(struct transport *transport,
 522                                int nr_heads, struct ref **to_fetch)
 523 {
 524         struct git_transport_data *data = transport->data;
 525         struct ref *refs;
 526         char *dest = xstrdup(transport->url);
 527         struct fetch_pack_args args;
 528         struct ref *refs_tmp = NULL;
 529
 530         memset(&args, 0, sizeof(args));
 531         args.uploadpack = data->options.uploadpack;
 532         args.keep_pack = data->options.keep;
 533         args.lock_pack = 1;
 534         args.use_thin_pack = data->options.thin;
 535         args.include_tag = data->options.followtags;
 536         args.verbose = (transport->verbose > 1);
 537         args.quiet = (transport->verbose < 0);
 538         args.no_progress = !transport->progress;
 539         args.depth = data->options.depth;
 540         args.check_self_contained_and_connected =
 541                 data->options.check_self_contained_and_connected;
 542         args.cloning = transport->cloning;
 543         args.update_shallow = data->options.update_shallow;
 544
 545         if (!data->got_remote_heads) {
 546                 connect_setup(transport, 0);
 547                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 548                                  NULL, &data->shallow);
 549                 data->got_remote_heads = 1;
 550         }
 551
 552         refs = fetch_pack(&args, data->fd, data->conn,
 553                           refs_tmp ? refs_tmp : transport->remote_refs,
 554                           dest, to_fetch, nr_heads, &data->shallow,
 555                           &transport->pack_lockfile);
 556         close(data->fd[0]);
 557         close(data->fd[1]);
 558         if (finish_connect(data->conn)) {
 559                 free_refs(refs);
 560                 refs = NULL;
 561         }
 562         data->conn = NULL;
 563         data->got_remote_heads = 0;
 564         data->options.self_contained_and_connected =
 565                 args.self_contained_and_connected;
 566
 567         free_refs(refs_tmp);
 568         free_refs(refs);
 569         free(dest);
 570         return (refs ? 0 : -1);
 571 }
 572
 573 static int push_had_errors(struct ref *ref)
 574 {
 575         for (; ref; ref = ref->next) {
 576                 switch (ref->status) {
 577                 case REF_STATUS_NONE:
 578                 case REF_STATUS_UPTODATE:
 579                 case REF_STATUS_OK:
 580                         break;
 581                 default:
 582                         return 1;
 583                 }
 584         }
 585         return 0;
 586 }
 587
 588 int transport_refs_pushed(struct ref *ref)
 589 {
 590         for (; ref; ref = ref->next) {
 591                 switch(ref->status) {
 592                 case REF_STATUS_NONE:
 593                 case REF_STATUS_UPTODATE:
 594                         break;
 595                 default:
 596                         return 1;
 597                 }
 598         }
 599         return 0;
 600 }
 601
 602 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 603 {
 604         struct refspec rs;
 605
 606         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 607                 return;
 608
 609         rs.src = ref->name;
 610         rs.dst = NULL;
 611
 612         if (!remote_find_tracking(remote, &rs)) {
 613                 if (verbose)
 614                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 615                 if (ref->deletion) {
 616                         delete_ref(rs.dst, NULL, 0);
 617                 } else
 618                         update_ref("update by push", rs.dst,
 619                                         ref->new_oid.hash, NULL, 0, 0);
 620                 free(rs.dst);
 621         }
 622 }
 623
 624 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 625 {
 626         if (porcelain) {
 627                 if (from)
 628                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 629                 else
 630                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 631                 if (msg)
 632                         fprintf(stdout, "%s (%s)\n", summary, msg);
 633                 else
 634                         fprintf(stdout, "%s\n", summary);
 635         } else {
 636                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 637                 if (from)
 638                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 639                 else
 640                         fputs(prettify_refname(to->name), stderr);
 641                 if (msg) {
 642                         fputs(" (", stderr);
 643                         fputs(msg, stderr);
 644                         fputc(')', stderr);
 645                 }
 646                 fputc('\n', stderr);
 647         }
 648 }
 649
 650 static const char *status_abbrev(unsigned char sha1[20])
 651 {
 652         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 653 }
 654
 655 static void print_ok_ref_status(struct ref *ref, int porcelain)
 656 {
 657         if (ref->deletion)
 658                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 659         else if (is_null_oid(&ref->old_oid))
 660                 print_ref_status('*',
 661                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 662                         "[new branch]"),
 663                         ref, ref->peer_ref, NULL, porcelain);
 664         else {
 665                 struct strbuf quickref = STRBUF_INIT;
 666                 char type;
 667                 const char *msg;
 668
 669                 strbuf_addstr(&quickref, status_abbrev(ref->old_oid.hash));
 670                 if (ref->forced_update) {
 671                         strbuf_addstr(&quickref, "...");
 672                         type = '+';
 673                         msg = "forced update";
 674                 } else {
 675                         strbuf_addstr(&quickref, "..");
 676                         type = ' ';
 677                         msg = NULL;
 678                 }
 679                 strbuf_addstr(&quickref, status_abbrev(ref->new_oid.hash));
 680
 681                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg, porcelain);
 682                 strbuf_release(&quickref);
 683         }
 684 }
 685
 686 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 687 {
 688         if (!count)
 689                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 690
 691         switch(ref->status) {
 692         case REF_STATUS_NONE:
 693                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 694                 break;
 695         case REF_STATUS_REJECT_NODELETE:
 696                 print_ref_status('!', "[rejected]", ref, NULL,
 697                                                  "remote does not support deleting refs", porcelain);
 698                 break;
 699         case REF_STATUS_UPTODATE:
 700                 print_ref_status('=', "[up to date]", ref,
 701                                                  ref->peer_ref, NULL, porcelain);
 702                 break;
 703         case REF_STATUS_REJECT_NONFASTFORWARD:
 704                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 705                                                  "non-fast-forward", porcelain);
 706                 break;
 707         case REF_STATUS_REJECT_ALREADY_EXISTS:
 708                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 709                                                  "already exists", porcelain);
 710                 break;
 711         case REF_STATUS_REJECT_FETCH_FIRST:
 712                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 713                                                  "fetch first", porcelain);
 714                 break;
 715         case REF_STATUS_REJECT_NEEDS_FORCE:
 716                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 717                                                  "needs force", porcelain);
 718                 break;
 719         case REF_STATUS_REJECT_STALE:
 720                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 721                                                  "stale info", porcelain);
 722                 break;
 723         case REF_STATUS_REJECT_SHALLOW:
 724                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 725                                                  "new shallow roots not allowed", porcelain);
 726                 break;
 727         case REF_STATUS_REMOTE_REJECT:
 728                 print_ref_status('!', "[remote rejected]", ref,
 729                                                  ref->deletion ? NULL : ref->peer_ref,
 730                                                  ref->remote_status, porcelain);
 731                 break;
 732         case REF_STATUS_EXPECTING_REPORT:
 733                 print_ref_status('!', "[remote failure]", ref,
 734                                                  ref->deletion ? NULL : ref->peer_ref,
 735                                                  "remote failed to report status", porcelain);
 736                 break;
 737         case REF_STATUS_ATOMIC_PUSH_FAILED:
 738                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 739                                                  "atomic push failed", porcelain);
 740                 break;
 741         case REF_STATUS_OK:
 742                 print_ok_ref_status(ref, porcelain);
 743                 break;
 744         }
 745
 746         return 1;
 747 }
 748
 749 void transport_print_push_status(const char *dest, struct ref *refs,
 750                                   int verbose, int porcelain, unsigned int *reject_reasons)
 751 {
 752         struct ref *ref;
 753         int n = 0;
 754         unsigned char head_sha1[20];
 755         char *head;
 756
 757         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 758
 759         if (verbose) {
 760                 for (ref = refs; ref; ref = ref->next)
 761                         if (ref->status == REF_STATUS_UPTODATE)
 762                                 n += print_one_push_status(ref, dest, n, porcelain);
 763         }
 764
 765         for (ref = refs; ref; ref = ref->next)
 766                 if (ref->status == REF_STATUS_OK)
 767                         n += print_one_push_status(ref, dest, n, porcelain);
 768
 769         *reject_reasons = 0;
 770         for (ref = refs; ref; ref = ref->next) {
 771                 if (ref->status != REF_STATUS_NONE &&
 772                     ref->status != REF_STATUS_UPTODATE &&
 773                     ref->status != REF_STATUS_OK)
 774                         n += print_one_push_status(ref, dest, n, porcelain);
 775                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 776                         if (head != NULL && !strcmp(head, ref->name))
 777                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 778                         else
 779                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 780                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 781                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 782                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 783                         *reject_reasons |= REJECT_FETCH_FIRST;
 784                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 785                         *reject_reasons |= REJECT_NEEDS_FORCE;
 786                 }
 787         }
 788         free(head);
 789 }
 790
 791 void transport_verify_remote_names(int nr_heads, const char **heads)
 792 {
 793         int i;
 794
 795         for (i = 0; i < nr_heads; i++) {
 796                 const char *local = heads[i];
 797                 const char *remote = strrchr(heads[i], ':');
 798
 799                 if (*local == '+')
 800                         local++;
 801
 802                 /* A matching refspec is okay.  */
 803                 if (remote == local && remote[1] == '\0')
 804                         continue;
 805
 806                 remote = remote ? (remote + 1) : local;
 807                 if (check_refname_format(remote,
 808                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 809                         die("remote part of refspec is not a valid name in %s",
 810                                 heads[i]);
 811         }
 812 }
 813
 814 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 815 {
 816         struct git_transport_data *data = transport->data;
 817         struct send_pack_args args;
 818         int ret;
 819
 820         if (!data->got_remote_heads) {
 821                 struct ref *tmp_refs;
 822                 connect_setup(transport, 1);
 823
 824                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 825                                  NULL, &data->shallow);
 826                 data->got_remote_heads = 1;
 827         }
 828
 829         memset(&args, 0, sizeof(args));
 830         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 831         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 832         args.use_thin_pack = data->options.thin;
 833         args.verbose = (transport->verbose > 0);
 834         args.quiet = (transport->verbose < 0);
 835         args.progress = transport->progress;
 836         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 837         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 838         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 839         args.url = transport->url;
 840
 841         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 842                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 843         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 844                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 845         else
 846                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 847
 848         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 849                         &data->extra_have);
 850
 851         close(data->fd[1]);
 852         close(data->fd[0]);
 853         ret |= finish_connect(data->conn);
 854         data->conn = NULL;
 855         data->got_remote_heads = 0;
 856
 857         return ret;
 858 }
 859
 860 static int connect_git(struct transport *transport, const char *name,
 861                        const char *executable, int fd[2])
 862 {
 863         struct git_transport_data *data = transport->data;
 864         data->conn = git_connect(data->fd, transport->url,
 865                                  executable, 0);
 866         fd[0] = data->fd[0];
 867         fd[1] = data->fd[1];
 868         return 0;
 869 }
 870
 871 static int disconnect_git(struct transport *transport)
 872 {
 873         struct git_transport_data *data = transport->data;
 874         if (data->conn) {
 875                 if (data->got_remote_heads)
 876                         packet_flush(data->fd[1]);
 877                 close(data->fd[0]);
 878                 close(data->fd[1]);
 879                 finish_connect(data->conn);
 880         }
 881
 882         free(data);
 883         return 0;
 884 }
 885
 886 void transport_take_over(struct transport *transport,
 887                          struct child_process *child)
 888 {
 889         struct git_transport_data *data;
 890
 891         if (!transport->smart_options)
 892                 die("Bug detected: Taking over transport requires non-NULL "
 893                     "smart_options field.");
 894
 895         data = xcalloc(1, sizeof(*data));
 896         data->options = *transport->smart_options;
 897         data->conn = child;
 898         data->fd[0] = data->conn->out;
 899         data->fd[1] = data->conn->in;
 900         data->got_remote_heads = 0;
 901         transport->data = data;
 902
 903         transport->set_option = NULL;
 904         transport->get_refs_list = get_refs_via_connect;
 905         transport->fetch = fetch_refs_via_pack;
 906         transport->push = NULL;
 907         transport->push_refs = git_transport_push;
 908         transport->disconnect = disconnect_git;
 909         transport->smart_options = &(data->options);
 910
 911         transport->cannot_reuse = 1;
 912 }
 913
 914 static int is_file(const char *url)
 915 {
 916         struct stat buf;
 917         if (stat(url, &buf))
 918                 return 0;
 919         return S_ISREG(buf.st_mode);
 920 }
 921
 922 static int external_specification_len(const char *url)
 923 {
 924         return strchr(url, ':') - url;
 925 }
 926
 927 static const struct string_list *protocol_whitelist(void)
 928 {
 929         static int enabled = -1;
 930         static struct string_list allowed = STRING_LIST_INIT_DUP;
 931
 932         if (enabled < 0) {
 933                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 934                 if (v) {
 935                         string_list_split(&allowed, v, ':', -1);
 936                         string_list_sort(&allowed);
 937                         enabled = 1;
 938                 } else {
 939                         enabled = 0;
 940                 }
 941         }
 942
 943         return enabled ? &allowed : NULL;
 944 }
 945
 946 int is_transport_allowed(const char *type)
 947 {
 948         const struct string_list *allowed = protocol_whitelist();
 949         return !allowed || string_list_has_string(allowed, type);
 950 }
 951
 952 void transport_check_allowed(const char *type)
 953 {
 954         if (!is_transport_allowed(type))
 955                 die("transport '%s' not allowed", type);
 956 }
 957
 958 int transport_restrict_protocols(void)
 959 {
 960         return !!protocol_whitelist();
 961 }
 962
 963 struct transport *transport_get(struct remote *remote, const char *url)
 964 {
 965         const char *helper;
 966         struct transport *ret = xcalloc(1, sizeof(*ret));
 967
 968         ret->progress = isatty(2);
 969
 970         if (!remote)
 971                 die("No remote provided to transport_get()");
 972
 973         ret->got_remote_refs = 0;
 974         ret->remote = remote;
 975         helper = remote->foreign_vcs;
 976
 977         if (!url && remote->url)
 978                 url = remote->url[0];
 979         ret->url = url;
 980
 981         /* maybe it is a foreign URL? */
 982         if (url) {
 983                 const char *p = url;
 984
 985                 while (is_urlschemechar(p == url, *p))
 986                         p++;
 987                 if (starts_with(p, "::"))
 988                         helper = xstrndup(url, p - url);
 989         }
 990
 991         if (helper) {
 992                 transport_helper_init(ret, helper);
 993         } else if (starts_with(url, "rsync:")) {
 994                 transport_check_allowed("rsync");
 995                 ret->get_refs_list = get_refs_via_rsync;
 996                 ret->fetch = fetch_objs_via_rsync;
 997                 ret->push = rsync_transport_push;
 998                 ret->smart_options = NULL;
 999         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
1000                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
1001                 transport_check_allowed("file");
1002                 ret->data = data;
1003                 ret->get_refs_list = get_refs_from_bundle;
1004                 ret->fetch = fetch_refs_from_bundle;
1005                 ret->disconnect = close_bundle;
1006                 ret->smart_options = NULL;
1007         } else if (!is_url(url)
1008                 || starts_with(url, "file://")
1009                 || starts_with(url, "git://")
1010                 || starts_with(url, "ssh://")
1011                 || starts_with(url, "git+ssh://")
1012                 || starts_with(url, "ssh+git://")) {
1013                 /*
1014                  * These are builtin smart transports; "allowed" transports
1015                  * will be checked individually in git_connect.
1016                  */
1017                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
1018                 ret->data = data;
1019                 ret->set_option = NULL;
1020                 ret->get_refs_list = get_refs_via_connect;
1021                 ret->fetch = fetch_refs_via_pack;
1022                 ret->push_refs = git_transport_push;
1023                 ret->connect = connect_git;
1024                 ret->disconnect = disconnect_git;
1025                 ret->smart_options = &(data->options);
1026
1027                 data->conn = NULL;
1028                 data->got_remote_heads = 0;
1029         } else {
1030                 /* Unknown protocol in URL. Pass to external handler. */
1031                 int len = external_specification_len(url);
1032                 char *handler = xmemdupz(url, len);
1033                 transport_helper_init(ret, handler);
1034         }
1035
1036         if (ret->smart_options) {
1037                 ret->smart_options->thin = 1;
1038                 ret->smart_options->uploadpack = "git-upload-pack";
1039                 if (remote->uploadpack)
1040                         ret->smart_options->uploadpack = remote->uploadpack;
1041                 ret->smart_options->receivepack = "git-receive-pack";
1042                 if (remote->receivepack)
1043                         ret->smart_options->receivepack = remote->receivepack;
1044         }
1045
1046         return ret;
1047 }
1048
1049 int transport_set_option(struct transport *transport,
1050                          const char *name, const char *value)
1051 {
1052         int git_reports = 1, protocol_reports = 1;
1053
1054         if (transport->smart_options)
1055                 git_reports = set_git_option(transport->smart_options,
1056                                              name, value);
1057
1058         if (transport->set_option)
1059                 protocol_reports = transport->set_option(transport, name,
1060                                                         value);
1061
1062         /* If either report is 0, report 0 (success). */
1063         if (!git_reports || !protocol_reports)
1064                 return 0;
1065         /* If either reports -1 (invalid value), report -1. */
1066         if ((git_reports == -1) || (protocol_reports == -1))
1067                 return -1;
1068         /* Otherwise if both report unknown, report unknown. */
1069         return 1;
1070 }
1071
1072 void transport_set_verbosity(struct transport *transport, int verbosity,
1073         int force_progress)
1074 {
1075         if (verbosity >= 1)
1076                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1077         if (verbosity < 0)
1078                 transport->verbose = -1;
1079
1080         /**
1081          * Rules used to determine whether to report progress (processing aborts
1082          * when a rule is satisfied):
1083          *
1084          *   . Report progress, if force_progress is 1 (ie. --progress).
1085          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1086          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1087          *   . Report progress if isatty(2) is 1.
1088          **/
1089         if (force_progress >= 0)
1090                 transport->progress = !!force_progress;
1091         else
1092                 transport->progress = verbosity >= 0 && isatty(2);
1093 }
1094
1095 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1096 {
1097         int i;
1098
1099         fprintf(stderr, "The following submodule paths contain changes that can\n"
1100                         "not be found on any remote:\n");
1101         for (i = 0; i < needs_pushing->nr; i++)
1102                 printf("  %s\n", needs_pushing->items[i].string);
1103         fprintf(stderr, "\nPlease try\n\n"
1104                         "       git push --recurse-submodules=on-demand\n\n"
1105                         "or cd to the path and use\n\n"
1106                         "       git push\n\n"
1107                         "to push them to a remote.\n\n");
1108
1109         string_list_clear(needs_pushing, 0);
1110
1111         die("Aborting.");
1112 }
1113
1114 static int run_pre_push_hook(struct transport *transport,
1115                              struct ref *remote_refs)
1116 {
1117         int ret = 0, x;
1118         struct ref *r;
1119         struct child_process proc = CHILD_PROCESS_INIT;
1120         struct strbuf buf;
1121         const char *argv[4];
1122
1123         if (!(argv[0] = find_hook("pre-push")))
1124                 return 0;
1125
1126         argv[1] = transport->remote->name;
1127         argv[2] = transport->url;
1128         argv[3] = NULL;
1129
1130         proc.argv = argv;
1131         proc.in = -1;
1132
1133         if (start_command(&proc)) {
1134                 finish_command(&proc);
1135                 return -1;
1136         }
1137
1138         sigchain_push(SIGPIPE, SIG_IGN);
1139
1140         strbuf_init(&buf, 256);
1141
1142         for (r = remote_refs; r; r = r->next) {
1143                 if (!r->peer_ref) continue;
1144                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1145                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1146                 if (r->status == REF_STATUS_UPTODATE) continue;
1147
1148                 strbuf_reset(&buf);
1149                 strbuf_addf( &buf, "%s %s %s %s\n",
1150                          r->peer_ref->name, oid_to_hex(&r->new_oid),
1151                          r->name, oid_to_hex(&r->old_oid));
1152
1153                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1154                         /* We do not mind if a hook does not read all refs. */
1155                         if (errno != EPIPE)
1156                                 ret = -1;
1157                         break;
1158                 }
1159         }
1160
1161         strbuf_release(&buf);
1162
1163         x = close(proc.in);
1164         if (!ret)
1165                 ret = x;
1166
1167         sigchain_pop(SIGPIPE);
1168
1169         x = finish_command(&proc);
1170         if (!ret)
1171                 ret = x;
1172
1173         return ret;
1174 }
1175
1176 int transport_push(struct transport *transport,
1177                    int refspec_nr, const char **refspec, int flags,
1178                    unsigned int *reject_reasons)
1179 {
1180         *reject_reasons = 0;
1181         transport_verify_remote_names(refspec_nr, refspec);
1182
1183         if (transport->push) {
1184                 /* Maybe FIXME. But no important transport uses this case. */
1185                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1186                         die("This transport does not support using --set-upstream");
1187
1188                 return transport->push(transport, refspec_nr, refspec, flags);
1189         } else if (transport->push_refs) {
1190                 struct ref *remote_refs;
1191                 struct ref *local_refs = get_local_heads();
1192                 int match_flags = MATCH_REFS_NONE;
1193                 int verbose = (transport->verbose > 0);
1194                 int quiet = (transport->verbose < 0);
1195                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1196                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1197                 int push_ret, ret, err;
1198
1199                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1200                         return -1;
1201
1202                 remote_refs = transport->get_refs_list(transport, 1);
1203
1204                 if (flags & TRANSPORT_PUSH_ALL)
1205                         match_flags |= MATCH_REFS_ALL;
1206                 if (flags & TRANSPORT_PUSH_MIRROR)
1207                         match_flags |= MATCH_REFS_MIRROR;
1208                 if (flags & TRANSPORT_PUSH_PRUNE)
1209                         match_flags |= MATCH_REFS_PRUNE;
1210                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1211                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1212
1213                 if (match_push_refs(local_refs, &remote_refs,
1214                                     refspec_nr, refspec, match_flags)) {
1215                         return -1;
1216                 }
1217
1218                 if (transport->smart_options &&
1219                     transport->smart_options->cas &&
1220                     !is_empty_cas(transport->smart_options->cas))
1221                         apply_push_cas(transport->smart_options->cas,
1222                                        transport->remote, remote_refs);
1223
1224                 set_ref_status_for_push(remote_refs,
1225                         flags & TRANSPORT_PUSH_MIRROR,
1226                         flags & TRANSPORT_PUSH_FORCE);
1227
1228                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1229                         if (run_pre_push_hook(transport, remote_refs))
1230                                 return -1;
1231
1232                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1233                         struct ref *ref = remote_refs;
1234                         for (; ref; ref = ref->next)
1235                                 if (!is_null_oid(&ref->new_oid) &&
1236                                     !push_unpushed_submodules(ref->new_oid.hash,
1237                                             transport->remote->name))
1238                                     die ("Failed to push all needed submodules!");
1239                 }
1240
1241                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1242                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1243                         struct ref *ref = remote_refs;
1244                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1245
1246                         for (; ref; ref = ref->next)
1247                                 if (!is_null_oid(&ref->new_oid) &&
1248                                     find_unpushed_submodules(ref->new_oid.hash,
1249                                             transport->remote->name, &needs_pushing))
1250                                         die_with_unpushed_submodules(&needs_pushing);
1251                 }
1252
1253                 push_ret = transport->push_refs(transport, remote_refs, flags);
1254                 err = push_had_errors(remote_refs);
1255                 ret = push_ret | err;
1256
1257                 if (!quiet || err)
1258                         transport_print_push_status(transport->url, remote_refs,
1259                                         verbose | porcelain, porcelain,
1260                                         reject_reasons);
1261
1262                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1263                         set_upstreams(transport, remote_refs, pretend);
1264
1265                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1266                         struct ref *ref;
1267                         for (ref = remote_refs; ref; ref = ref->next)
1268                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1269                 }
1270
1271                 if (porcelain && !push_ret)
1272                         puts("Done");
1273                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1274                         fprintf(stderr, "Everything up-to-date\n");
1275
1276                 return ret;
1277         }
1278         return 1;
1279 }
1280
1281 const struct ref *transport_get_remote_refs(struct transport *transport)
1282 {
1283         if (!transport->got_remote_refs) {
1284                 transport->remote_refs = transport->get_refs_list(transport, 0);
1285                 transport->got_remote_refs = 1;
1286         }
1287
1288         return transport->remote_refs;
1289 }
1290
1291 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1292 {
1293         int rc;
1294         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1295         struct ref **heads = NULL;
1296         struct ref *rm;
1297
1298         for (rm = refs; rm; rm = rm->next) {
1299                 nr_refs++;
1300                 if (rm->peer_ref &&
1301                     !is_null_oid(&rm->old_oid) &&
1302                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1303                         continue;
1304                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1305                 heads[nr_heads++] = rm;
1306         }
1307
1308         if (!nr_heads) {
1309                 /*
1310                  * When deepening of a shallow repository is requested,
1311                  * then local and remote refs are likely to still be equal.
1312                  * Just feed them all to the fetch method in that case.
1313                  * This condition shouldn't be met in a non-deepening fetch
1314                  * (see builtin/fetch.c:quickfetch()).
1315                  */
1316                 heads = xmalloc(nr_refs * sizeof(*heads));
1317                 for (rm = refs; rm; rm = rm->next)
1318                         heads[nr_heads++] = rm;
1319         }
1320
1321         rc = transport->fetch(transport, nr_heads, heads);
1322
1323         free(heads);
1324         return rc;
1325 }
1326
1327 void transport_unlock_pack(struct transport *transport)
1328 {
1329         if (transport->pack_lockfile) {
1330                 unlink_or_warn(transport->pack_lockfile);
1331                 free(transport->pack_lockfile);
1332                 transport->pack_lockfile = NULL;
1333         }
1334 }
1335
1336 int transport_connect(struct transport *transport, const char *name,
1337                       const char *exec, int fd[2])
1338 {
1339         if (transport->connect)
1340                 return transport->connect(transport, name, exec, fd);
1341         else
1342                 die("Operation not supported by protocol");
1343 }
1344
1345 int transport_disconnect(struct transport *transport)
1346 {
1347         int ret = 0;
1348         if (transport->disconnect)
1349                 ret = transport->disconnect(transport);
1350         free(transport);
1351         return ret;
1352 }
1353
1354 /*
1355  * Strip username (and password) from a URL and return
1356  * it in a newly allocated string.
1357  */
1358 char *transport_anonymize_url(const char *url)
1359 {
1360         char *anon_url, *scheme_prefix, *anon_part;
1361         size_t anon_len, prefix_len = 0;
1362
1363         anon_part = strchr(url, '@');
1364         if (url_is_local_not_ssh(url) || !anon_part)
1365                 goto literal_copy;
1366
1367         anon_len = strlen(++anon_part);
1368         scheme_prefix = strstr(url, "://");
1369         if (!scheme_prefix) {
1370                 if (!strchr(anon_part, ':'))
1371                         /* cannot be "me@there:/path/name" */
1372                         goto literal_copy;
1373         } else {
1374                 const char *cp;
1375                 /* make sure scheme is reasonable */
1376                 for (cp = url; cp < scheme_prefix; cp++) {
1377                         switch (*cp) {
1378                                 /* RFC 1738 2.1 */
1379                         case '+': case '.': case '-':
1380                                 break; /* ok */
1381                         default:
1382                                 if (isalnum(*cp))
1383                                         break;
1384                                 /* it isn't */
1385                                 goto literal_copy;
1386                         }
1387                 }
1388                 /* @ past the first slash does not count */
1389                 cp = strchr(scheme_prefix + 3, '/');
1390                 if (cp && cp < anon_part)
1391                         goto literal_copy;
1392                 prefix_len = scheme_prefix - url + 3;
1393         }
1394         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1395         memcpy(anon_url, url, prefix_len);
1396         memcpy(anon_url + prefix_len, anon_part, anon_len);
1397         return anon_url;
1398 literal_copy:
1399         return xstrdup(url);
1400 }
1401
1402 struct alternate_refs_data {
1403         alternate_ref_fn *fn;
1404         void *data;
1405 };
1406
1407 static int refs_from_alternate_cb(struct alternate_object_database *e,
1408                                   void *data)
1409 {
1410         char *other;
1411         size_t len;
1412         struct remote *remote;
1413         struct transport *transport;
1414         const struct ref *extra;
1415         struct alternate_refs_data *cb = data;
1416
1417         e->name[-1] = '\0';
1418         other = xstrdup(real_path(e->base));
1419         e->name[-1] = '/';
1420         len = strlen(other);
1421
1422         while (other[len-1] == '/')
1423                 other[--len] = '\0';
1424         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1425                 goto out;
1426         /* Is this a git repository with refs? */
1427         memcpy(other + len - 8, "/refs", 6);
1428         if (!is_directory(other))
1429                 goto out;
1430         other[len - 8] = '\0';
1431         remote = remote_get(other);
1432         transport = transport_get(remote, other);
1433         for (extra = transport_get_remote_refs(transport);
1434              extra;
1435              extra = extra->next)
1436                 cb->fn(extra, cb->data);
1437         transport_disconnect(transport);
1438 out:
1439         free(other);
1440         return 0;
1441 }
1442
1443 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1444 {
1445         struct alternate_refs_data cb;
1446         cb.fn = fn;
1447         cb.data = data;
1448         foreach_alt_odb(refs_from_alternate_cb, &cb);
1449 }