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_sha1_hex(buffer, next->old_sha1)) {
  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_sha1_hex(buffer, next->old_sha1)) {
 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_sha1(ref->new_sha1))
 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_sha1, e->sha1);
 417                 ref->next = result;
 418                 result = ref;
 419         }
 420         return result;
 421 }
 422
 423 static int fetch_refs_from_bundle(struct transport *transport,
 424                                int nr_heads, struct ref **to_fetch)
 425 {
 426         struct bundle_transport_data *data = transport->data;
 427         return unbundle(&data->header, data->fd,
 428                         transport->progress ? BUNDLE_VERBOSE : 0);
 429 }
 430
 431 static int close_bundle(struct transport *transport)
 432 {
 433         struct bundle_transport_data *data = transport->data;
 434         if (data->fd > 0)
 435                 close(data->fd);
 436         free(data);
 437         return 0;
 438 }
 439
 440 struct git_transport_data {
 441         struct git_transport_options options;
 442         struct child_process *conn;
 443         int fd[2];
 444         unsigned got_remote_heads : 1;
 445         struct sha1_array extra_have;
 446         struct sha1_array shallow;
 447 };
 448
 449 static int set_git_option(struct git_transport_options *opts,
 450                           const char *name, const char *value)
 451 {
 452         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 453                 opts->uploadpack = value;
 454                 return 0;
 455         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 456                 opts->receivepack = value;
 457                 return 0;
 458         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 459                 opts->thin = !!value;
 460                 return 0;
 461         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 462                 opts->followtags = !!value;
 463                 return 0;
 464         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 465                 opts->keep = !!value;
 466                 return 0;
 467         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 468                 opts->update_shallow = !!value;
 469                 return 0;
 470         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 471                 if (!value)
 472                         opts->depth = 0;
 473                 else {
 474                         char *end;
 475                         opts->depth = strtol(value, &end, 0);
 476                         if (*end)
 477                                 die("transport: invalid depth option '%s'", value);
 478                 }
 479                 return 0;
 480         }
 481         return 1;
 482 }
 483
 484 static int connect_setup(struct transport *transport, int for_push, int verbose)
 485 {
 486         struct git_transport_data *data = transport->data;
 487
 488         if (data->conn)
 489                 return 0;
 490
 491         data->conn = git_connect(data->fd, transport->url,
 492                                  for_push ? data->options.receivepack :
 493                                  data->options.uploadpack,
 494                                  verbose ? CONNECT_VERBOSE : 0);
 495
 496         return 0;
 497 }
 498
 499 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 500 {
 501         struct git_transport_data *data = transport->data;
 502         struct ref *refs;
 503
 504         connect_setup(transport, for_push, 0);
 505         get_remote_heads(data->fd[0], NULL, 0, &refs,
 506                          for_push ? REF_NORMAL : 0,
 507                          &data->extra_have,
 508                          &data->shallow);
 509         data->got_remote_heads = 1;
 510
 511         return refs;
 512 }
 513
 514 static int fetch_refs_via_pack(struct transport *transport,
 515                                int nr_heads, struct ref **to_fetch)
 516 {
 517         struct git_transport_data *data = transport->data;
 518         struct ref *refs;
 519         char *dest = xstrdup(transport->url);
 520         struct fetch_pack_args args;
 521         struct ref *refs_tmp = NULL;
 522
 523         memset(&args, 0, sizeof(args));
 524         args.uploadpack = data->options.uploadpack;
 525         args.keep_pack = data->options.keep;
 526         args.lock_pack = 1;
 527         args.use_thin_pack = data->options.thin;
 528         args.include_tag = data->options.followtags;
 529         args.verbose = (transport->verbose > 1);
 530         args.quiet = (transport->verbose < 0);
 531         args.no_progress = !transport->progress;
 532         args.depth = data->options.depth;
 533         args.check_self_contained_and_connected =
 534                 data->options.check_self_contained_and_connected;
 535         args.cloning = transport->cloning;
 536         args.update_shallow = data->options.update_shallow;
 537
 538         if (!data->got_remote_heads) {
 539                 connect_setup(transport, 0, 0);
 540                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 541                                  NULL, &data->shallow);
 542                 data->got_remote_heads = 1;
 543         }
 544
 545         refs = fetch_pack(&args, data->fd, data->conn,
 546                           refs_tmp ? refs_tmp : transport->remote_refs,
 547                           dest, to_fetch, nr_heads, &data->shallow,
 548                           &transport->pack_lockfile);
 549         close(data->fd[0]);
 550         close(data->fd[1]);
 551         if (finish_connect(data->conn)) {
 552                 free_refs(refs);
 553                 refs = NULL;
 554         }
 555         data->conn = NULL;
 556         data->got_remote_heads = 0;
 557         data->options.self_contained_and_connected =
 558                 args.self_contained_and_connected;
 559
 560         free_refs(refs_tmp);
 561         free_refs(refs);
 562         free(dest);
 563         return (refs ? 0 : -1);
 564 }
 565
 566 static int push_had_errors(struct ref *ref)
 567 {
 568         for (; ref; ref = ref->next) {
 569                 switch (ref->status) {
 570                 case REF_STATUS_NONE:
 571                 case REF_STATUS_UPTODATE:
 572                 case REF_STATUS_OK:
 573                         break;
 574                 default:
 575                         return 1;
 576                 }
 577         }
 578         return 0;
 579 }
 580
 581 int transport_refs_pushed(struct ref *ref)
 582 {
 583         for (; ref; ref = ref->next) {
 584                 switch(ref->status) {
 585                 case REF_STATUS_NONE:
 586                 case REF_STATUS_UPTODATE:
 587                         break;
 588                 default:
 589                         return 1;
 590                 }
 591         }
 592         return 0;
 593 }
 594
 595 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 596 {
 597         struct refspec rs;
 598
 599         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 600                 return;
 601
 602         rs.src = ref->name;
 603         rs.dst = NULL;
 604
 605         if (!remote_find_tracking(remote, &rs)) {
 606                 if (verbose)
 607                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 608                 if (ref->deletion) {
 609                         delete_ref(rs.dst, NULL, 0);
 610                 } else
 611                         update_ref("update by push", rs.dst,
 612                                         ref->new_sha1, NULL, 0, 0);
 613                 free(rs.dst);
 614         }
 615 }
 616
 617 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 618 {
 619         if (porcelain) {
 620                 if (from)
 621                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 622                 else
 623                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 624                 if (msg)
 625                         fprintf(stdout, "%s (%s)\n", summary, msg);
 626                 else
 627                         fprintf(stdout, "%s\n", summary);
 628         } else {
 629                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 630                 if (from)
 631                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 632                 else
 633                         fputs(prettify_refname(to->name), stderr);
 634                 if (msg) {
 635                         fputs(" (", stderr);
 636                         fputs(msg, stderr);
 637                         fputc(')', stderr);
 638                 }
 639                 fputc('\n', stderr);
 640         }
 641 }
 642
 643 static const char *status_abbrev(unsigned char sha1[20])
 644 {
 645         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 646 }
 647
 648 static void print_ok_ref_status(struct ref *ref, int porcelain)
 649 {
 650         if (ref->deletion)
 651                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 652         else if (is_null_sha1(ref->old_sha1))
 653                 print_ref_status('*',
 654                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 655                         "[new branch]"),
 656                         ref, ref->peer_ref, NULL, porcelain);
 657         else {
 658                 char quickref[84];
 659                 char type;
 660                 const char *msg;
 661
 662                 strcpy(quickref, status_abbrev(ref->old_sha1));
 663                 if (ref->forced_update) {
 664                         strcat(quickref, "...");
 665                         type = '+';
 666                         msg = "forced update";
 667                 } else {
 668                         strcat(quickref, "..");
 669                         type = ' ';
 670                         msg = NULL;
 671                 }
 672                 strcat(quickref, status_abbrev(ref->new_sha1));
 673
 674                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 675         }
 676 }
 677
 678 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 679 {
 680         if (!count)
 681                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 682
 683         switch(ref->status) {
 684         case REF_STATUS_NONE:
 685                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 686                 break;
 687         case REF_STATUS_REJECT_NODELETE:
 688                 print_ref_status('!', "[rejected]", ref, NULL,
 689                                                  "remote does not support deleting refs", porcelain);
 690                 break;
 691         case REF_STATUS_UPTODATE:
 692                 print_ref_status('=', "[up to date]", ref,
 693                                                  ref->peer_ref, NULL, porcelain);
 694                 break;
 695         case REF_STATUS_REJECT_NONFASTFORWARD:
 696                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 697                                                  "non-fast-forward", porcelain);
 698                 break;
 699         case REF_STATUS_REJECT_ALREADY_EXISTS:
 700                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 701                                                  "already exists", porcelain);
 702                 break;
 703         case REF_STATUS_REJECT_FETCH_FIRST:
 704                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 705                                                  "fetch first", porcelain);
 706                 break;
 707         case REF_STATUS_REJECT_NEEDS_FORCE:
 708                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 709                                                  "needs force", porcelain);
 710                 break;
 711         case REF_STATUS_REJECT_STALE:
 712                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 713                                                  "stale info", porcelain);
 714                 break;
 715         case REF_STATUS_REJECT_SHALLOW:
 716                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 717                                                  "new shallow roots not allowed", porcelain);
 718                 break;
 719         case REF_STATUS_REMOTE_REJECT:
 720                 print_ref_status('!', "[remote rejected]", ref,
 721                                                  ref->deletion ? NULL : ref->peer_ref,
 722                                                  ref->remote_status, porcelain);
 723                 break;
 724         case REF_STATUS_EXPECTING_REPORT:
 725                 print_ref_status('!', "[remote failure]", ref,
 726                                                  ref->deletion ? NULL : ref->peer_ref,
 727                                                  "remote failed to report status", porcelain);
 728                 break;
 729         case REF_STATUS_ATOMIC_PUSH_FAILED:
 730                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 731                                                  "atomic push failed", porcelain);
 732                 break;
 733         case REF_STATUS_OK:
 734                 print_ok_ref_status(ref, porcelain);
 735                 break;
 736         }
 737
 738         return 1;
 739 }
 740
 741 void transport_print_push_status(const char *dest, struct ref *refs,
 742                                   int verbose, int porcelain, unsigned int *reject_reasons)
 743 {
 744         struct ref *ref;
 745         int n = 0;
 746         unsigned char head_sha1[20];
 747         char *head;
 748
 749         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 750
 751         if (verbose) {
 752                 for (ref = refs; ref; ref = ref->next)
 753                         if (ref->status == REF_STATUS_UPTODATE)
 754                                 n += print_one_push_status(ref, dest, n, porcelain);
 755         }
 756
 757         for (ref = refs; ref; ref = ref->next)
 758                 if (ref->status == REF_STATUS_OK)
 759                         n += print_one_push_status(ref, dest, n, porcelain);
 760
 761         *reject_reasons = 0;
 762         for (ref = refs; ref; ref = ref->next) {
 763                 if (ref->status != REF_STATUS_NONE &&
 764                     ref->status != REF_STATUS_UPTODATE &&
 765                     ref->status != REF_STATUS_OK)
 766                         n += print_one_push_status(ref, dest, n, porcelain);
 767                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 768                         if (head != NULL && !strcmp(head, ref->name))
 769                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 770                         else
 771                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 772                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 773                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 774                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 775                         *reject_reasons |= REJECT_FETCH_FIRST;
 776                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 777                         *reject_reasons |= REJECT_NEEDS_FORCE;
 778                 }
 779         }
 780         free(head);
 781 }
 782
 783 void transport_verify_remote_names(int nr_heads, const char **heads)
 784 {
 785         int i;
 786
 787         for (i = 0; i < nr_heads; i++) {
 788                 const char *local = heads[i];
 789                 const char *remote = strrchr(heads[i], ':');
 790
 791                 if (*local == '+')
 792                         local++;
 793
 794                 /* A matching refspec is okay.  */
 795                 if (remote == local && remote[1] == '\0')
 796                         continue;
 797
 798                 remote = remote ? (remote + 1) : local;
 799                 if (check_refname_format(remote,
 800                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 801                         die("remote part of refspec is not a valid name in %s",
 802                                 heads[i]);
 803         }
 804 }
 805
 806 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 807 {
 808         struct git_transport_data *data = transport->data;
 809         struct send_pack_args args;
 810         int ret;
 811
 812         if (!data->got_remote_heads) {
 813                 struct ref *tmp_refs;
 814                 connect_setup(transport, 1, 0);
 815
 816                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 817                                  NULL, &data->shallow);
 818                 data->got_remote_heads = 1;
 819         }
 820
 821         memset(&args, 0, sizeof(args));
 822         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 823         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 824         args.use_thin_pack = data->options.thin;
 825         args.verbose = (transport->verbose > 0);
 826         args.quiet = (transport->verbose < 0);
 827         args.progress = transport->progress;
 828         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 829         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 830         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 831         args.url = transport->url;
 832
 833         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 834                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 835         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 836                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 837         else
 838                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 839
 840         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 841                         &data->extra_have);
 842
 843         close(data->fd[1]);
 844         close(data->fd[0]);
 845         ret |= finish_connect(data->conn);
 846         data->conn = NULL;
 847         data->got_remote_heads = 0;
 848
 849         return ret;
 850 }
 851
 852 static int connect_git(struct transport *transport, const char *name,
 853                        const char *executable, int fd[2])
 854 {
 855         struct git_transport_data *data = transport->data;
 856         data->conn = git_connect(data->fd, transport->url,
 857                                  executable, 0);
 858         fd[0] = data->fd[0];
 859         fd[1] = data->fd[1];
 860         return 0;
 861 }
 862
 863 static int disconnect_git(struct transport *transport)
 864 {
 865         struct git_transport_data *data = transport->data;
 866         if (data->conn) {
 867                 if (data->got_remote_heads)
 868                         packet_flush(data->fd[1]);
 869                 close(data->fd[0]);
 870                 close(data->fd[1]);
 871                 finish_connect(data->conn);
 872         }
 873
 874         free(data);
 875         return 0;
 876 }
 877
 878 void transport_take_over(struct transport *transport,
 879                          struct child_process *child)
 880 {
 881         struct git_transport_data *data;
 882
 883         if (!transport->smart_options)
 884                 die("Bug detected: Taking over transport requires non-NULL "
 885                     "smart_options field.");
 886
 887         data = xcalloc(1, sizeof(*data));
 888         data->options = *transport->smart_options;
 889         data->conn = child;
 890         data->fd[0] = data->conn->out;
 891         data->fd[1] = data->conn->in;
 892         data->got_remote_heads = 0;
 893         transport->data = data;
 894
 895         transport->set_option = NULL;
 896         transport->get_refs_list = get_refs_via_connect;
 897         transport->fetch = fetch_refs_via_pack;
 898         transport->push = NULL;
 899         transport->push_refs = git_transport_push;
 900         transport->disconnect = disconnect_git;
 901         transport->smart_options = &(data->options);
 902
 903         transport->cannot_reuse = 1;
 904 }
 905
 906 static int is_file(const char *url)
 907 {
 908         struct stat buf;
 909         if (stat(url, &buf))
 910                 return 0;
 911         return S_ISREG(buf.st_mode);
 912 }
 913
 914 static int external_specification_len(const char *url)
 915 {
 916         return strchr(url, ':') - url;
 917 }
 918
 919 static const struct string_list *protocol_whitelist(void)
 920 {
 921         static int enabled = -1;
 922         static struct string_list allowed = STRING_LIST_INIT_DUP;
 923
 924         if (enabled < 0) {
 925                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 926                 if (v) {
 927                         string_list_split(&allowed, v, ':', -1);
 928                         string_list_sort(&allowed);
 929                         enabled = 1;
 930                 } else {
 931                         enabled = 0;
 932                 }
 933         }
 934
 935         return enabled ? &allowed : NULL;
 936 }
 937
 938 int is_transport_allowed(const char *type)
 939 {
 940         const struct string_list *allowed = protocol_whitelist();
 941         return !allowed || string_list_has_string(allowed, type);
 942 }
 943
 944 void transport_check_allowed(const char *type)
 945 {
 946         if (!is_transport_allowed(type))
 947                 die("transport '%s' not allowed", type);
 948 }
 949
 950 int transport_restrict_protocols(void)
 951 {
 952         return !!protocol_whitelist();
 953 }
 954
 955 struct transport *transport_get(struct remote *remote, const char *url)
 956 {
 957         const char *helper;
 958         struct transport *ret = xcalloc(1, sizeof(*ret));
 959
 960         ret->progress = isatty(2);
 961
 962         if (!remote)
 963                 die("No remote provided to transport_get()");
 964
 965         ret->got_remote_refs = 0;
 966         ret->remote = remote;
 967         helper = remote->foreign_vcs;
 968
 969         if (!url && remote->url)
 970                 url = remote->url[0];
 971         ret->url = url;
 972
 973         /* maybe it is a foreign URL? */
 974         if (url) {
 975                 const char *p = url;
 976
 977                 while (is_urlschemechar(p == url, *p))
 978                         p++;
 979                 if (starts_with(p, "::"))
 980                         helper = xstrndup(url, p - url);
 981         }
 982
 983         if (helper) {
 984                 transport_helper_init(ret, helper);
 985         } else if (starts_with(url, "rsync:")) {
 986                 transport_check_allowed("rsync");
 987                 ret->get_refs_list = get_refs_via_rsync;
 988                 ret->fetch = fetch_objs_via_rsync;
 989                 ret->push = rsync_transport_push;
 990                 ret->smart_options = NULL;
 991         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 992                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 993                 transport_check_allowed("file");
 994                 ret->data = data;
 995                 ret->get_refs_list = get_refs_from_bundle;
 996                 ret->fetch = fetch_refs_from_bundle;
 997                 ret->disconnect = close_bundle;
 998                 ret->smart_options = NULL;
 999         } else if (!is_url(url)
1000                 || starts_with(url, "file://")
1001                 || starts_with(url, "git://")
1002                 || starts_with(url, "ssh://")
1003                 || starts_with(url, "git+ssh://")
1004                 || starts_with(url, "ssh+git://")) {
1005                 /*
1006                  * These are builtin smart transports; "allowed" transports
1007                  * will be checked individually in git_connect.
1008                  */
1009                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
1010                 ret->data = data;
1011                 ret->set_option = NULL;
1012                 ret->get_refs_list = get_refs_via_connect;
1013                 ret->fetch = fetch_refs_via_pack;
1014                 ret->push_refs = git_transport_push;
1015                 ret->connect = connect_git;
1016                 ret->disconnect = disconnect_git;
1017                 ret->smart_options = &(data->options);
1018
1019                 data->conn = NULL;
1020                 data->got_remote_heads = 0;
1021         } else {
1022                 /* Unknown protocol in URL. Pass to external handler. */
1023                 int len = external_specification_len(url);
1024                 char *handler = xmemdupz(url, len);
1025                 transport_helper_init(ret, handler);
1026         }
1027
1028         if (ret->smart_options) {
1029                 ret->smart_options->thin = 1;
1030                 ret->smart_options->uploadpack = "git-upload-pack";
1031                 if (remote->uploadpack)
1032                         ret->smart_options->uploadpack = remote->uploadpack;
1033                 ret->smart_options->receivepack = "git-receive-pack";
1034                 if (remote->receivepack)
1035                         ret->smart_options->receivepack = remote->receivepack;
1036         }
1037
1038         return ret;
1039 }
1040
1041 int transport_set_option(struct transport *transport,
1042                          const char *name, const char *value)
1043 {
1044         int git_reports = 1, protocol_reports = 1;
1045
1046         if (transport->smart_options)
1047                 git_reports = set_git_option(transport->smart_options,
1048                                              name, value);
1049
1050         if (transport->set_option)
1051                 protocol_reports = transport->set_option(transport, name,
1052                                                         value);
1053
1054         /* If either report is 0, report 0 (success). */
1055         if (!git_reports || !protocol_reports)
1056                 return 0;
1057         /* If either reports -1 (invalid value), report -1. */
1058         if ((git_reports == -1) || (protocol_reports == -1))
1059                 return -1;
1060         /* Otherwise if both report unknown, report unknown. */
1061         return 1;
1062 }
1063
1064 void transport_set_verbosity(struct transport *transport, int verbosity,
1065         int force_progress)
1066 {
1067         if (verbosity >= 1)
1068                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1069         if (verbosity < 0)
1070                 transport->verbose = -1;
1071
1072         /**
1073          * Rules used to determine whether to report progress (processing aborts
1074          * when a rule is satisfied):
1075          *
1076          *   . Report progress, if force_progress is 1 (ie. --progress).
1077          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1078          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1079          *   . Report progress if isatty(2) is 1.
1080          **/
1081         if (force_progress >= 0)
1082                 transport->progress = !!force_progress;
1083         else
1084                 transport->progress = verbosity >= 0 && isatty(2);
1085 }
1086
1087 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1088 {
1089         int i;
1090
1091         fprintf(stderr, "The following submodule paths contain changes that can\n"
1092                         "not be found on any remote:\n");
1093         for (i = 0; i < needs_pushing->nr; i++)
1094                 printf("  %s\n", needs_pushing->items[i].string);
1095         fprintf(stderr, "\nPlease try\n\n"
1096                         "       git push --recurse-submodules=on-demand\n\n"
1097                         "or cd to the path and use\n\n"
1098                         "       git push\n\n"
1099                         "to push them to a remote.\n\n");
1100
1101         string_list_clear(needs_pushing, 0);
1102
1103         die("Aborting.");
1104 }
1105
1106 static int run_pre_push_hook(struct transport *transport,
1107                              struct ref *remote_refs)
1108 {
1109         int ret = 0, x;
1110         struct ref *r;
1111         struct child_process proc = CHILD_PROCESS_INIT;
1112         struct strbuf buf;
1113         const char *argv[4];
1114
1115         if (!(argv[0] = find_hook("pre-push")))
1116                 return 0;
1117
1118         argv[1] = transport->remote->name;
1119         argv[2] = transport->url;
1120         argv[3] = NULL;
1121
1122         proc.argv = argv;
1123         proc.in = -1;
1124
1125         if (start_command(&proc)) {
1126                 finish_command(&proc);
1127                 return -1;
1128         }
1129
1130         sigchain_push(SIGPIPE, SIG_IGN);
1131
1132         strbuf_init(&buf, 256);
1133
1134         for (r = remote_refs; r; r = r->next) {
1135                 if (!r->peer_ref) continue;
1136                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1137                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1138                 if (r->status == REF_STATUS_UPTODATE) continue;
1139
1140                 strbuf_reset(&buf);
1141                 strbuf_addf( &buf, "%s %s %s %s\n",
1142                          r->peer_ref->name, sha1_to_hex(r->new_sha1),
1143                          r->name, sha1_to_hex(r->old_sha1));
1144
1145                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1146                         /* We do not mind if a hook does not read all refs. */
1147                         if (errno != EPIPE)
1148                                 ret = -1;
1149                         break;
1150                 }
1151         }
1152
1153         strbuf_release(&buf);
1154
1155         x = close(proc.in);
1156         if (!ret)
1157                 ret = x;
1158
1159         sigchain_pop(SIGPIPE);
1160
1161         x = finish_command(&proc);
1162         if (!ret)
1163                 ret = x;
1164
1165         return ret;
1166 }
1167
1168 int transport_push(struct transport *transport,
1169                    int refspec_nr, const char **refspec, int flags,
1170                    unsigned int *reject_reasons)
1171 {
1172         *reject_reasons = 0;
1173         transport_verify_remote_names(refspec_nr, refspec);
1174
1175         if (transport->push) {
1176                 /* Maybe FIXME. But no important transport uses this case. */
1177                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1178                         die("This transport does not support using --set-upstream");
1179
1180                 return transport->push(transport, refspec_nr, refspec, flags);
1181         } else if (transport->push_refs) {
1182                 struct ref *remote_refs;
1183                 struct ref *local_refs = get_local_heads();
1184                 int match_flags = MATCH_REFS_NONE;
1185                 int verbose = (transport->verbose > 0);
1186                 int quiet = (transport->verbose < 0);
1187                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1188                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1189                 int push_ret, ret, err;
1190
1191                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1192                         return -1;
1193
1194                 remote_refs = transport->get_refs_list(transport, 1);
1195
1196                 if (flags & TRANSPORT_PUSH_ALL)
1197                         match_flags |= MATCH_REFS_ALL;
1198                 if (flags & TRANSPORT_PUSH_MIRROR)
1199                         match_flags |= MATCH_REFS_MIRROR;
1200                 if (flags & TRANSPORT_PUSH_PRUNE)
1201                         match_flags |= MATCH_REFS_PRUNE;
1202                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1203                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1204
1205                 if (match_push_refs(local_refs, &remote_refs,
1206                                     refspec_nr, refspec, match_flags)) {
1207                         return -1;
1208                 }
1209
1210                 if (transport->smart_options &&
1211                     transport->smart_options->cas &&
1212                     !is_empty_cas(transport->smart_options->cas))
1213                         apply_push_cas(transport->smart_options->cas,
1214                                        transport->remote, remote_refs);
1215
1216                 set_ref_status_for_push(remote_refs,
1217                         flags & TRANSPORT_PUSH_MIRROR,
1218                         flags & TRANSPORT_PUSH_FORCE);
1219
1220                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1221                         if (run_pre_push_hook(transport, remote_refs))
1222                                 return -1;
1223
1224                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1225                         struct ref *ref = remote_refs;
1226                         for (; ref; ref = ref->next)
1227                                 if (!is_null_sha1(ref->new_sha1) &&
1228                                     !push_unpushed_submodules(ref->new_sha1,
1229                                             transport->remote->name))
1230                                     die ("Failed to push all needed submodules!");
1231                 }
1232
1233                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1234                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1235                         struct ref *ref = remote_refs;
1236                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1237
1238                         for (; ref; ref = ref->next)
1239                                 if (!is_null_sha1(ref->new_sha1) &&
1240                                     find_unpushed_submodules(ref->new_sha1,
1241                                             transport->remote->name, &needs_pushing))
1242                                         die_with_unpushed_submodules(&needs_pushing);
1243                 }
1244
1245                 push_ret = transport->push_refs(transport, remote_refs, flags);
1246                 err = push_had_errors(remote_refs);
1247                 ret = push_ret | err;
1248
1249                 if (!quiet || err)
1250                         transport_print_push_status(transport->url, remote_refs,
1251                                         verbose | porcelain, porcelain,
1252                                         reject_reasons);
1253
1254                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1255                         set_upstreams(transport, remote_refs, pretend);
1256
1257                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1258                         struct ref *ref;
1259                         for (ref = remote_refs; ref; ref = ref->next)
1260                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1261                 }
1262
1263                 if (porcelain && !push_ret)
1264                         puts("Done");
1265                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1266                         fprintf(stderr, "Everything up-to-date\n");
1267
1268                 return ret;
1269         }
1270         return 1;
1271 }
1272
1273 const struct ref *transport_get_remote_refs(struct transport *transport)
1274 {
1275         if (!transport->got_remote_refs) {
1276                 transport->remote_refs = transport->get_refs_list(transport, 0);
1277                 transport->got_remote_refs = 1;
1278         }
1279
1280         return transport->remote_refs;
1281 }
1282
1283 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1284 {
1285         int rc;
1286         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1287         struct ref **heads = NULL;
1288         struct ref *rm;
1289
1290         for (rm = refs; rm; rm = rm->next) {
1291                 nr_refs++;
1292                 if (rm->peer_ref &&
1293                     !is_null_sha1(rm->old_sha1) &&
1294                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1295                         continue;
1296                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1297                 heads[nr_heads++] = rm;
1298         }
1299
1300         if (!nr_heads) {
1301                 /*
1302                  * When deepening of a shallow repository is requested,
1303                  * then local and remote refs are likely to still be equal.
1304                  * Just feed them all to the fetch method in that case.
1305                  * This condition shouldn't be met in a non-deepening fetch
1306                  * (see builtin/fetch.c:quickfetch()).
1307                  */
1308                 heads = xmalloc(nr_refs * sizeof(*heads));
1309                 for (rm = refs; rm; rm = rm->next)
1310                         heads[nr_heads++] = rm;
1311         }
1312
1313         rc = transport->fetch(transport, nr_heads, heads);
1314
1315         free(heads);
1316         return rc;
1317 }
1318
1319 void transport_unlock_pack(struct transport *transport)
1320 {
1321         if (transport->pack_lockfile) {
1322                 unlink_or_warn(transport->pack_lockfile);
1323                 free(transport->pack_lockfile);
1324                 transport->pack_lockfile = NULL;
1325         }
1326 }
1327
1328 int transport_connect(struct transport *transport, const char *name,
1329                       const char *exec, int fd[2])
1330 {
1331         if (transport->connect)
1332                 return transport->connect(transport, name, exec, fd);
1333         else
1334                 die("Operation not supported by protocol");
1335 }
1336
1337 int transport_disconnect(struct transport *transport)
1338 {
1339         int ret = 0;
1340         if (transport->disconnect)
1341                 ret = transport->disconnect(transport);
1342         free(transport);
1343         return ret;
1344 }
1345
1346 /*
1347  * Strip username (and password) from a URL and return
1348  * it in a newly allocated string.
1349  */
1350 char *transport_anonymize_url(const char *url)
1351 {
1352         char *anon_url, *scheme_prefix, *anon_part;
1353         size_t anon_len, prefix_len = 0;
1354
1355         anon_part = strchr(url, '@');
1356         if (url_is_local_not_ssh(url) || !anon_part)
1357                 goto literal_copy;
1358
1359         anon_len = strlen(++anon_part);
1360         scheme_prefix = strstr(url, "://");
1361         if (!scheme_prefix) {
1362                 if (!strchr(anon_part, ':'))
1363                         /* cannot be "me@there:/path/name" */
1364                         goto literal_copy;
1365         } else {
1366                 const char *cp;
1367                 /* make sure scheme is reasonable */
1368                 for (cp = url; cp < scheme_prefix; cp++) {
1369                         switch (*cp) {
1370                                 /* RFC 1738 2.1 */
1371                         case '+': case '.': case '-':
1372                                 break; /* ok */
1373                         default:
1374                                 if (isalnum(*cp))
1375                                         break;
1376                                 /* it isn't */
1377                                 goto literal_copy;
1378                         }
1379                 }
1380                 /* @ past the first slash does not count */
1381                 cp = strchr(scheme_prefix + 3, '/');
1382                 if (cp && cp < anon_part)
1383                         goto literal_copy;
1384                 prefix_len = scheme_prefix - url + 3;
1385         }
1386         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1387         memcpy(anon_url, url, prefix_len);
1388         memcpy(anon_url + prefix_len, anon_part, anon_len);
1389         return anon_url;
1390 literal_copy:
1391         return xstrdup(url);
1392 }
1393
1394 struct alternate_refs_data {
1395         alternate_ref_fn *fn;
1396         void *data;
1397 };
1398
1399 static int refs_from_alternate_cb(struct alternate_object_database *e,
1400                                   void *data)
1401 {
1402         char *other;
1403         size_t len;
1404         struct remote *remote;
1405         struct transport *transport;
1406         const struct ref *extra;
1407         struct alternate_refs_data *cb = data;
1408
1409         e->name[-1] = '\0';
1410         other = xstrdup(real_path(e->base));
1411         e->name[-1] = '/';
1412         len = strlen(other);
1413
1414         while (other[len-1] == '/')
1415                 other[--len] = '\0';
1416         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1417                 goto out;
1418         /* Is this a git repository with refs? */
1419         memcpy(other + len - 8, "/refs", 6);
1420         if (!is_directory(other))
1421                 goto out;
1422         other[len - 8] = '\0';
1423         remote = remote_get(other);
1424         transport = transport_get(remote, other);
1425         for (extra = transport_get_remote_refs(transport);
1426              extra;
1427              extra = extra->next)
1428                 cb->fn(extra, cb->data);
1429         transport_disconnect(transport);
1430 out:
1431         free(other);
1432         return 0;
1433 }
1434
1435 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1436 {
1437         struct alternate_refs_data cb;
1438         cb.fn = fn;
1439         cb.data = data;
1440         foreach_alt_odb(refs_from_alternate_cb, &cb);
1441 }