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_tracking(struct transport *transport, struct ref *refs,
 148         int pretend, int publish)
 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                         if (publish)
 186                                 install_branch_publish(localname + 11,
 187                                                 transport->remote->name,
 188                                                 remotename);
 189                         else
 190                                 install_branch_config(BRANCH_CONFIG_VERBOSE,
 191                                                 localname + 11, transport->remote->name,
 192                                                 remotename);
 193                 } else
 194                         printf("Would set %s of '%s' to '%s' of '%s'\n",
 195                                 publish ? "publish" : "upstream",
 196                                 localname + 11, remotename + 11,
 197                                 transport->remote->name);
 198         }
 199 }
 200
 201 static const char *rsync_url(const char *url)
 202 {
 203         if (!starts_with(url, "rsync://"))
 204                 skip_prefix(url, "rsync:", &url);
 205         return url;
 206 }
 207
 208 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 209 {
 210         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 211         struct ref dummy = {NULL}, *tail = &dummy;
 212         struct child_process rsync = CHILD_PROCESS_INIT;
 213         const char *args[5];
 214         int temp_dir_len;
 215
 216         if (for_push)
 217                 return NULL;
 218
 219         /* copy the refs to the temporary directory */
 220
 221         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 222         if (!mkdtemp(temp_dir.buf))
 223                 die_errno ("Could not make temporary directory");
 224         temp_dir_len = temp_dir.len;
 225
 226         strbuf_addstr(&buf, rsync_url(transport->url));
 227         strbuf_addstr(&buf, "/refs");
 228
 229         rsync.argv = args;
 230         rsync.stdout_to_stderr = 1;
 231         args[0] = "rsync";
 232         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 233         args[2] = buf.buf;
 234         args[3] = temp_dir.buf;
 235         args[4] = NULL;
 236
 237         if (run_command(&rsync))
 238                 die ("Could not run rsync to get refs");
 239
 240         strbuf_reset(&buf);
 241         strbuf_addstr(&buf, rsync_url(transport->url));
 242         strbuf_addstr(&buf, "/packed-refs");
 243
 244         args[2] = buf.buf;
 245
 246         if (run_command(&rsync))
 247                 die ("Could not run rsync to get refs");
 248
 249         /* read the copied refs */
 250
 251         strbuf_addstr(&temp_dir, "/refs");
 252         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 253         strbuf_setlen(&temp_dir, temp_dir_len);
 254
 255         tail = &dummy;
 256         strbuf_addstr(&temp_dir, "/packed-refs");
 257         insert_packed_refs(temp_dir.buf, &tail);
 258         strbuf_setlen(&temp_dir, temp_dir_len);
 259
 260         if (remove_dir_recursively(&temp_dir, 0))
 261                 warning ("Error removing temporary directory %s.",
 262                                 temp_dir.buf);
 263
 264         strbuf_release(&buf);
 265         strbuf_release(&temp_dir);
 266
 267         return dummy.next;
 268 }
 269
 270 static int fetch_objs_via_rsync(struct transport *transport,
 271                                 int nr_objs, struct ref **to_fetch)
 272 {
 273         struct child_process rsync = CHILD_PROCESS_INIT;
 274
 275         rsync.stdout_to_stderr = 1;
 276         argv_array_push(&rsync.args, "rsync");
 277         argv_array_push(&rsync.args, (transport->verbose > 1) ? "-rv" : "-r");
 278         argv_array_push(&rsync.args, "--ignore-existing");
 279         argv_array_push(&rsync.args, "--exclude");
 280         argv_array_push(&rsync.args, "info");
 281         argv_array_pushf(&rsync.args, "%s/objects/", rsync_url(transport->url));
 282         argv_array_push(&rsync.args, get_object_directory());
 283
 284         /* NEEDSWORK: handle one level of alternates */
 285         return run_command(&rsync);
 286 }
 287
 288 static int write_one_ref(const char *name, const struct object_id *oid,
 289                          int flags, void *data)
 290 {
 291         struct strbuf *buf = data;
 292         int len = buf->len;
 293
 294         /* when called via for_each_ref(), flags is non-zero */
 295         if (flags && !starts_with(name, "refs/heads/") &&
 296                         !starts_with(name, "refs/tags/"))
 297                 return 0;
 298
 299         strbuf_addstr(buf, name);
 300         if (safe_create_leading_directories(buf->buf) ||
 301             write_file_gently(buf->buf, "%s", oid_to_hex(oid)))
 302                 return error("problems writing temporary file %s: %s",
 303                              buf->buf, strerror(errno));
 304         strbuf_setlen(buf, len);
 305         return 0;
 306 }
 307
 308 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 309                                   int refspec_nr, const char **refspec)
 310 {
 311         int i;
 312
 313         for (i = 0; i < refspec_nr; i++) {
 314                 struct object_id oid;
 315                 char *ref;
 316
 317                 if (dwim_ref(refspec[i], strlen(refspec[i]), oid.hash, &ref) != 1)
 318                         return error("Could not get ref %s", refspec[i]);
 319
 320                 if (write_one_ref(ref, &oid, 0, temp_dir)) {
 321                         free(ref);
 322                         return -1;
 323                 }
 324                 free(ref);
 325         }
 326         return 0;
 327 }
 328
 329 static int rsync_transport_push(struct transport *transport,
 330                 int refspec_nr, const char **refspec, int flags)
 331 {
 332         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 333         int result = 0, i;
 334         struct child_process rsync = CHILD_PROCESS_INIT;
 335         const char *args[10];
 336
 337         if (flags & TRANSPORT_PUSH_MIRROR)
 338                 return error("rsync transport does not support mirror mode");
 339
 340         /* first push the objects */
 341
 342         strbuf_addstr(&buf, rsync_url(transport->url));
 343         strbuf_addch(&buf, '/');
 344
 345         rsync.argv = args;
 346         rsync.stdout_to_stderr = 1;
 347         i = 0;
 348         args[i++] = "rsync";
 349         args[i++] = "-a";
 350         if (flags & TRANSPORT_PUSH_DRY_RUN)
 351                 args[i++] = "--dry-run";
 352         if (transport->verbose > 1)
 353                 args[i++] = "-v";
 354         args[i++] = "--ignore-existing";
 355         args[i++] = "--exclude";
 356         args[i++] = "info";
 357         args[i++] = get_object_directory();
 358         args[i++] = buf.buf;
 359         args[i++] = NULL;
 360
 361         if (run_command(&rsync))
 362                 return error("Could not push objects to %s",
 363                                 rsync_url(transport->url));
 364
 365         /* copy the refs to the temporary directory; they could be packed. */
 366
 367         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 368         if (!mkdtemp(temp_dir.buf))
 369                 die_errno ("Could not make temporary directory");
 370         strbuf_addch(&temp_dir, '/');
 371
 372         if (flags & TRANSPORT_PUSH_ALL) {
 373                 if (for_each_ref(write_one_ref, &temp_dir))
 374                         return -1;
 375         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 376                 return -1;
 377
 378         i = 2;
 379         if (flags & TRANSPORT_PUSH_DRY_RUN)
 380                 args[i++] = "--dry-run";
 381         if (!(flags & TRANSPORT_PUSH_FORCE))
 382                 args[i++] = "--ignore-existing";
 383         args[i++] = temp_dir.buf;
 384         args[i++] = rsync_url(transport->url);
 385         args[i++] = NULL;
 386         if (run_command(&rsync))
 387                 result = error("Could not push to %s",
 388                                 rsync_url(transport->url));
 389
 390         if (remove_dir_recursively(&temp_dir, 0))
 391                 warning ("Could not remove temporary directory %s.",
 392                                 temp_dir.buf);
 393
 394         strbuf_release(&buf);
 395         strbuf_release(&temp_dir);
 396
 397         return result;
 398 }
 399
 400 struct bundle_transport_data {
 401         int fd;
 402         struct bundle_header header;
 403 };
 404
 405 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 406 {
 407         struct bundle_transport_data *data = transport->data;
 408         struct ref *result = NULL;
 409         int i;
 410
 411         if (for_push)
 412                 return NULL;
 413
 414         if (data->fd > 0)
 415                 close(data->fd);
 416         data->fd = read_bundle_header(transport->url, &data->header);
 417         if (data->fd < 0)
 418                 die ("Could not read bundle '%s'.", transport->url);
 419         for (i = 0; i < data->header.references.nr; i++) {
 420                 struct ref_list_entry *e = data->header.references.list + i;
 421                 struct ref *ref = alloc_ref(e->name);
 422                 hashcpy(ref->old_oid.hash, e->sha1);
 423                 ref->next = result;
 424                 result = ref;
 425         }
 426         return result;
 427 }
 428
 429 static int fetch_refs_from_bundle(struct transport *transport,
 430                                int nr_heads, struct ref **to_fetch)
 431 {
 432         struct bundle_transport_data *data = transport->data;
 433         return unbundle(&data->header, data->fd,
 434                         transport->progress ? BUNDLE_VERBOSE : 0);
 435 }
 436
 437 static int close_bundle(struct transport *transport)
 438 {
 439         struct bundle_transport_data *data = transport->data;
 440         if (data->fd > 0)
 441                 close(data->fd);
 442         free(data);
 443         return 0;
 444 }
 445
 446 struct git_transport_data {
 447         struct git_transport_options options;
 448         struct child_process *conn;
 449         int fd[2];
 450         unsigned got_remote_heads : 1;
 451         struct sha1_array extra_have;
 452         struct sha1_array shallow;
 453 };
 454
 455 static int set_git_option(struct git_transport_options *opts,
 456                           const char *name, const char *value)
 457 {
 458         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 459                 opts->uploadpack = value;
 460                 return 0;
 461         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 462                 opts->receivepack = value;
 463                 return 0;
 464         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 465                 opts->thin = !!value;
 466                 return 0;
 467         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 468                 opts->followtags = !!value;
 469                 return 0;
 470         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 471                 opts->keep = !!value;
 472                 return 0;
 473         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 474                 opts->update_shallow = !!value;
 475                 return 0;
 476         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 477                 if (!value)
 478                         opts->depth = 0;
 479                 else {
 480                         char *end;
 481                         opts->depth = strtol(value, &end, 0);
 482                         if (*end)
 483                                 die("transport: invalid depth option '%s'", value);
 484                 }
 485                 return 0;
 486         }
 487         return 1;
 488 }
 489
 490 static int connect_setup(struct transport *transport, int for_push, int verbose)
 491 {
 492         struct git_transport_data *data = transport->data;
 493
 494         if (data->conn)
 495                 return 0;
 496
 497         data->conn = git_connect(data->fd, transport->url,
 498                                  for_push ? data->options.receivepack :
 499                                  data->options.uploadpack,
 500                                  verbose ? CONNECT_VERBOSE : 0);
 501
 502         return 0;
 503 }
 504
 505 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 506 {
 507         struct git_transport_data *data = transport->data;
 508         struct ref *refs;
 509
 510         connect_setup(transport, for_push, 0);
 511         get_remote_heads(data->fd[0], NULL, 0, &refs,
 512                          for_push ? REF_NORMAL : 0,
 513                          &data->extra_have,
 514                          &data->shallow);
 515         data->got_remote_heads = 1;
 516
 517         return refs;
 518 }
 519
 520 static int fetch_refs_via_pack(struct transport *transport,
 521                                int nr_heads, struct ref **to_fetch)
 522 {
 523         struct git_transport_data *data = transport->data;
 524         struct ref *refs;
 525         char *dest = xstrdup(transport->url);
 526         struct fetch_pack_args args;
 527         struct ref *refs_tmp = NULL;
 528
 529         memset(&args, 0, sizeof(args));
 530         args.uploadpack = data->options.uploadpack;
 531         args.keep_pack = data->options.keep;
 532         args.lock_pack = 1;
 533         args.use_thin_pack = data->options.thin;
 534         args.include_tag = data->options.followtags;
 535         args.verbose = (transport->verbose > 1);
 536         args.quiet = (transport->verbose < 0);
 537         args.no_progress = !transport->progress;
 538         args.depth = data->options.depth;
 539         args.check_self_contained_and_connected =
 540                 data->options.check_self_contained_and_connected;
 541         args.cloning = transport->cloning;
 542         args.update_shallow = data->options.update_shallow;
 543
 544         if (!data->got_remote_heads) {
 545                 connect_setup(transport, 0, 0);
 546                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 547                                  NULL, &data->shallow);
 548                 data->got_remote_heads = 1;
 549         }
 550
 551         refs = fetch_pack(&args, data->fd, data->conn,
 552                           refs_tmp ? refs_tmp : transport->remote_refs,
 553                           dest, to_fetch, nr_heads, &data->shallow,
 554                           &transport->pack_lockfile);
 555         close(data->fd[0]);
 556         close(data->fd[1]);
 557         if (finish_connect(data->conn)) {
 558                 free_refs(refs);
 559                 refs = NULL;
 560         }
 561         data->conn = NULL;
 562         data->got_remote_heads = 0;
 563         data->options.self_contained_and_connected =
 564                 args.self_contained_and_connected;
 565
 566         free_refs(refs_tmp);
 567         free_refs(refs);
 568         free(dest);
 569         return (refs ? 0 : -1);
 570 }
 571
 572 static int push_had_errors(struct ref *ref)
 573 {
 574         for (; ref; ref = ref->next) {
 575                 switch (ref->status) {
 576                 case REF_STATUS_NONE:
 577                 case REF_STATUS_UPTODATE:
 578                 case REF_STATUS_OK:
 579                         break;
 580                 default:
 581                         return 1;
 582                 }
 583         }
 584         return 0;
 585 }
 586
 587 int transport_refs_pushed(struct ref *ref)
 588 {
 589         for (; ref; ref = ref->next) {
 590                 switch(ref->status) {
 591                 case REF_STATUS_NONE:
 592                 case REF_STATUS_UPTODATE:
 593                         break;
 594                 default:
 595                         return 1;
 596                 }
 597         }
 598         return 0;
 599 }
 600
 601 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 602 {
 603         struct refspec rs;
 604
 605         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 606                 return;
 607
 608         rs.src = ref->name;
 609         rs.dst = NULL;
 610
 611         if (!remote_find_tracking(remote, &rs)) {
 612                 if (verbose)
 613                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 614                 if (ref->deletion) {
 615                         delete_ref(rs.dst, NULL, 0);
 616                 } else
 617                         update_ref("update by push", rs.dst,
 618                                         ref->new_oid.hash, NULL, 0, 0);
 619                 free(rs.dst);
 620         }
 621 }
 622
 623 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 624 {
 625         if (porcelain) {
 626                 if (from)
 627                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 628                 else
 629                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 630                 if (msg)
 631                         fprintf(stdout, "%s (%s)\n", summary, msg);
 632                 else
 633                         fprintf(stdout, "%s\n", summary);
 634         } else {
 635                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 636                 if (from)
 637                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 638                 else
 639                         fputs(prettify_refname(to->name), stderr);
 640                 if (msg) {
 641                         fputs(" (", stderr);
 642                         fputs(msg, stderr);
 643                         fputc(')', stderr);
 644                 }
 645                 fputc('\n', stderr);
 646         }
 647 }
 648
 649 static const char *status_abbrev(unsigned char sha1[20])
 650 {
 651         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 652 }
 653
 654 static void print_ok_ref_status(struct ref *ref, int porcelain)
 655 {
 656         if (ref->deletion)
 657                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 658         else if (is_null_oid(&ref->old_oid))
 659                 print_ref_status('*',
 660                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 661                         "[new branch]"),
 662                         ref, ref->peer_ref, NULL, porcelain);
 663         else {
 664                 struct strbuf quickref = STRBUF_INIT;
 665                 char type;
 666                 const char *msg;
 667
 668                 strbuf_addstr(&quickref, status_abbrev(ref->old_oid.hash));
 669                 if (ref->forced_update) {
 670                         strbuf_addstr(&quickref, "...");
 671                         type = '+';
 672                         msg = "forced update";
 673                 } else {
 674                         strbuf_addstr(&quickref, "..");
 675                         type = ' ';
 676                         msg = NULL;
 677                 }
 678                 strbuf_addstr(&quickref, status_abbrev(ref->new_oid.hash));
 679
 680                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg, porcelain);
 681                 strbuf_release(&quickref);
 682         }
 683 }
 684
 685 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 686 {
 687         if (!count)
 688                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 689
 690         switch(ref->status) {
 691         case REF_STATUS_NONE:
 692                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 693                 break;
 694         case REF_STATUS_REJECT_NODELETE:
 695                 print_ref_status('!', "[rejected]", ref, NULL,
 696                                                  "remote does not support deleting refs", porcelain);
 697                 break;
 698         case REF_STATUS_UPTODATE:
 699                 print_ref_status('=', "[up to date]", ref,
 700                                                  ref->peer_ref, NULL, porcelain);
 701                 break;
 702         case REF_STATUS_REJECT_NONFASTFORWARD:
 703                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 704                                                  "non-fast-forward", porcelain);
 705                 break;
 706         case REF_STATUS_REJECT_ALREADY_EXISTS:
 707                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 708                                                  "already exists", porcelain);
 709                 break;
 710         case REF_STATUS_REJECT_FETCH_FIRST:
 711                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 712                                                  "fetch first", porcelain);
 713                 break;
 714         case REF_STATUS_REJECT_NEEDS_FORCE:
 715                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 716                                                  "needs force", porcelain);
 717                 break;
 718         case REF_STATUS_REJECT_STALE:
 719                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 720                                                  "stale info", porcelain);
 721                 break;
 722         case REF_STATUS_REJECT_SHALLOW:
 723                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 724                                                  "new shallow roots not allowed", porcelain);
 725                 break;
 726         case REF_STATUS_REMOTE_REJECT:
 727                 print_ref_status('!', "[remote rejected]", ref,
 728                                                  ref->deletion ? NULL : ref->peer_ref,
 729                                                  ref->remote_status, porcelain);
 730                 break;
 731         case REF_STATUS_EXPECTING_REPORT:
 732                 print_ref_status('!', "[remote failure]", ref,
 733                                                  ref->deletion ? NULL : ref->peer_ref,
 734                                                  "remote failed to report status", porcelain);
 735                 break;
 736         case REF_STATUS_ATOMIC_PUSH_FAILED:
 737                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 738                                                  "atomic push failed", porcelain);
 739                 break;
 740         case REF_STATUS_OK:
 741                 print_ok_ref_status(ref, porcelain);
 742                 break;
 743         }
 744
 745         return 1;
 746 }
 747
 748 void transport_print_push_status(const char *dest, struct ref *refs,
 749                                   int verbose, int porcelain, unsigned int *reject_reasons)
 750 {
 751         struct ref *ref;
 752         int n = 0;
 753         unsigned char head_sha1[20];
 754         char *head;
 755
 756         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 757
 758         if (verbose) {
 759                 for (ref = refs; ref; ref = ref->next)
 760                         if (ref->status == REF_STATUS_UPTODATE)
 761                                 n += print_one_push_status(ref, dest, n, porcelain);
 762         }
 763
 764         for (ref = refs; ref; ref = ref->next)
 765                 if (ref->status == REF_STATUS_OK)
 766                         n += print_one_push_status(ref, dest, n, porcelain);
 767
 768         *reject_reasons = 0;
 769         for (ref = refs; ref; ref = ref->next) {
 770                 if (ref->status != REF_STATUS_NONE &&
 771                     ref->status != REF_STATUS_UPTODATE &&
 772                     ref->status != REF_STATUS_OK)
 773                         n += print_one_push_status(ref, dest, n, porcelain);
 774                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 775                         if (head != NULL && !strcmp(head, ref->name))
 776                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 777                         else
 778                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 779                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 780                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 781                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 782                         *reject_reasons |= REJECT_FETCH_FIRST;
 783                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 784                         *reject_reasons |= REJECT_NEEDS_FORCE;
 785                 }
 786         }
 787         free(head);
 788 }
 789
 790 void transport_verify_remote_names(int nr_heads, const char **heads)
 791 {
 792         int i;
 793
 794         for (i = 0; i < nr_heads; i++) {
 795                 const char *local = heads[i];
 796                 const char *remote = strrchr(heads[i], ':');
 797
 798                 if (*local == '+')
 799                         local++;
 800
 801                 /* A matching refspec is okay.  */
 802                 if (remote == local && remote[1] == '\0')
 803                         continue;
 804
 805                 remote = remote ? (remote + 1) : local;
 806                 if (check_refname_format(remote,
 807                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 808                         die("remote part of refspec is not a valid name in %s",
 809                                 heads[i]);
 810         }
 811 }
 812
 813 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 814 {
 815         struct git_transport_data *data = transport->data;
 816         struct send_pack_args args;
 817         int ret;
 818
 819         if (!data->got_remote_heads) {
 820                 struct ref *tmp_refs;
 821                 connect_setup(transport, 1, 0);
 822
 823                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 824                                  NULL, &data->shallow);
 825                 data->got_remote_heads = 1;
 826         }
 827
 828         memset(&args, 0, sizeof(args));
 829         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 830         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 831         args.use_thin_pack = data->options.thin;
 832         args.verbose = (transport->verbose > 0);
 833         args.quiet = (transport->verbose < 0);
 834         args.progress = transport->progress;
 835         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 836         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 837         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 838         args.url = transport->url;
 839
 840         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 841                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 842         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 843                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 844         else
 845                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 846
 847         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 848                         &data->extra_have);
 849
 850         close(data->fd[1]);
 851         close(data->fd[0]);
 852         ret |= finish_connect(data->conn);
 853         data->conn = NULL;
 854         data->got_remote_heads = 0;
 855
 856         return ret;
 857 }
 858
 859 static int connect_git(struct transport *transport, const char *name,
 860                        const char *executable, int fd[2])
 861 {
 862         struct git_transport_data *data = transport->data;
 863         data->conn = git_connect(data->fd, transport->url,
 864                                  executable, 0);
 865         fd[0] = data->fd[0];
 866         fd[1] = data->fd[1];
 867         return 0;
 868 }
 869
 870 static int disconnect_git(struct transport *transport)
 871 {
 872         struct git_transport_data *data = transport->data;
 873         if (data->conn) {
 874                 if (data->got_remote_heads)
 875                         packet_flush(data->fd[1]);
 876                 close(data->fd[0]);
 877                 close(data->fd[1]);
 878                 finish_connect(data->conn);
 879         }
 880
 881         free(data);
 882         return 0;
 883 }
 884
 885 void transport_take_over(struct transport *transport,
 886                          struct child_process *child)
 887 {
 888         struct git_transport_data *data;
 889
 890         if (!transport->smart_options)
 891                 die("Bug detected: Taking over transport requires non-NULL "
 892                     "smart_options field.");
 893
 894         data = xcalloc(1, sizeof(*data));
 895         data->options = *transport->smart_options;
 896         data->conn = child;
 897         data->fd[0] = data->conn->out;
 898         data->fd[1] = data->conn->in;
 899         data->got_remote_heads = 0;
 900         transport->data = data;
 901
 902         transport->set_option = NULL;
 903         transport->get_refs_list = get_refs_via_connect;
 904         transport->fetch = fetch_refs_via_pack;
 905         transport->push = NULL;
 906         transport->push_refs = git_transport_push;
 907         transport->disconnect = disconnect_git;
 908         transport->smart_options = &(data->options);
 909
 910         transport->cannot_reuse = 1;
 911 }
 912
 913 static int is_file(const char *url)
 914 {
 915         struct stat buf;
 916         if (stat(url, &buf))
 917                 return 0;
 918         return S_ISREG(buf.st_mode);
 919 }
 920
 921 static int external_specification_len(const char *url)
 922 {
 923         return strchr(url, ':') - url;
 924 }
 925
 926 static const struct string_list *protocol_whitelist(void)
 927 {
 928         static int enabled = -1;
 929         static struct string_list allowed = STRING_LIST_INIT_DUP;
 930
 931         if (enabled < 0) {
 932                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 933                 if (v) {
 934                         string_list_split(&allowed, v, ':', -1);
 935                         string_list_sort(&allowed);
 936                         enabled = 1;
 937                 } else {
 938                         enabled = 0;
 939                 }
 940         }
 941
 942         return enabled ? &allowed : NULL;
 943 }
 944
 945 int is_transport_allowed(const char *type)
 946 {
 947         const struct string_list *allowed = protocol_whitelist();
 948         return !allowed || string_list_has_string(allowed, type);
 949 }
 950
 951 void transport_check_allowed(const char *type)
 952 {
 953         if (!is_transport_allowed(type))
 954                 die("transport '%s' not allowed", type);
 955 }
 956
 957 int transport_restrict_protocols(void)
 958 {
 959         return !!protocol_whitelist();
 960 }
 961
 962 struct transport *transport_get(struct remote *remote, const char *url)
 963 {
 964         const char *helper;
 965         struct transport *ret = xcalloc(1, sizeof(*ret));
 966
 967         ret->progress = isatty(2);
 968
 969         if (!remote)
 970                 die("No remote provided to transport_get()");
 971
 972         ret->got_remote_refs = 0;
 973         ret->remote = remote;
 974         helper = remote->foreign_vcs;
 975
 976         if (!url && remote->url)
 977                 url = remote->url[0];
 978         ret->url = url;
 979
 980         /* maybe it is a foreign URL? */
 981         if (url) {
 982                 const char *p = url;
 983
 984                 while (is_urlschemechar(p == url, *p))
 985                         p++;
 986                 if (starts_with(p, "::"))
 987                         helper = xstrndup(url, p - url);
 988         }
 989
 990         if (helper) {
 991                 transport_helper_init(ret, helper);
 992         } else if (starts_with(url, "rsync:")) {
 993                 transport_check_allowed("rsync");
 994                 ret->get_refs_list = get_refs_via_rsync;
 995                 ret->fetch = fetch_objs_via_rsync;
 996                 ret->push = rsync_transport_push;
 997                 ret->smart_options = NULL;
 998         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 999                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
1000                 transport_check_allowed("file");
1001                 ret->data = data;
1002                 ret->get_refs_list = get_refs_from_bundle;
1003                 ret->fetch = fetch_refs_from_bundle;
1004                 ret->disconnect = close_bundle;
1005                 ret->smart_options = NULL;
1006         } else if (!is_url(url)
1007                 || starts_with(url, "file://")
1008                 || starts_with(url, "git://")
1009                 || starts_with(url, "ssh://")
1010                 || starts_with(url, "git+ssh://")
1011                 || starts_with(url, "ssh+git://")) {
1012                 /*
1013                  * These are builtin smart transports; "allowed" transports
1014                  * will be checked individually in git_connect.
1015                  */
1016                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
1017                 ret->data = data;
1018                 ret->set_option = NULL;
1019                 ret->get_refs_list = get_refs_via_connect;
1020                 ret->fetch = fetch_refs_via_pack;
1021                 ret->push_refs = git_transport_push;
1022                 ret->connect = connect_git;
1023                 ret->disconnect = disconnect_git;
1024                 ret->smart_options = &(data->options);
1025
1026                 data->conn = NULL;
1027                 data->got_remote_heads = 0;
1028         } else {
1029                 /* Unknown protocol in URL. Pass to external handler. */
1030                 int len = external_specification_len(url);
1031                 char *handler = xmemdupz(url, len);
1032                 transport_helper_init(ret, handler);
1033         }
1034
1035         if (ret->smart_options) {
1036                 ret->smart_options->thin = 1;
1037                 ret->smart_options->uploadpack = "git-upload-pack";
1038                 if (remote->uploadpack)
1039                         ret->smart_options->uploadpack = remote->uploadpack;
1040                 ret->smart_options->receivepack = "git-receive-pack";
1041                 if (remote->receivepack)
1042                         ret->smart_options->receivepack = remote->receivepack;
1043         }
1044
1045         return ret;
1046 }
1047
1048 int transport_set_option(struct transport *transport,
1049                          const char *name, const char *value)
1050 {
1051         int git_reports = 1, protocol_reports = 1;
1052
1053         if (transport->smart_options)
1054                 git_reports = set_git_option(transport->smart_options,
1055                                              name, value);
1056
1057         if (transport->set_option)
1058                 protocol_reports = transport->set_option(transport, name,
1059                                                         value);
1060
1061         /* If either report is 0, report 0 (success). */
1062         if (!git_reports || !protocol_reports)
1063                 return 0;
1064         /* If either reports -1 (invalid value), report -1. */
1065         if ((git_reports == -1) || (protocol_reports == -1))
1066                 return -1;
1067         /* Otherwise if both report unknown, report unknown. */
1068         return 1;
1069 }
1070
1071 void transport_set_verbosity(struct transport *transport, int verbosity,
1072         int force_progress)
1073 {
1074         if (verbosity >= 1)
1075                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1076         if (verbosity < 0)
1077                 transport->verbose = -1;
1078
1079         /**
1080          * Rules used to determine whether to report progress (processing aborts
1081          * when a rule is satisfied):
1082          *
1083          *   . Report progress, if force_progress is 1 (ie. --progress).
1084          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1085          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1086          *   . Report progress if isatty(2) is 1.
1087          **/
1088         if (force_progress >= 0)
1089                 transport->progress = !!force_progress;
1090         else
1091                 transport->progress = verbosity >= 0 && isatty(2);
1092 }
1093
1094 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1095 {
1096         int i;
1097
1098         fprintf(stderr, "The following submodule paths contain changes that can\n"
1099                         "not be found on any remote:\n");
1100         for (i = 0; i < needs_pushing->nr; i++)
1101                 printf("  %s\n", needs_pushing->items[i].string);
1102         fprintf(stderr, "\nPlease try\n\n"
1103                         "       git push --recurse-submodules=on-demand\n\n"
1104                         "or cd to the path and use\n\n"
1105                         "       git push\n\n"
1106                         "to push them to a remote.\n\n");
1107
1108         string_list_clear(needs_pushing, 0);
1109
1110         die("Aborting.");
1111 }
1112
1113 static int run_pre_push_hook(struct transport *transport,
1114                              struct ref *remote_refs)
1115 {
1116         int ret = 0, x;
1117         struct ref *r;
1118         struct child_process proc = CHILD_PROCESS_INIT;
1119         struct strbuf buf;
1120         const char *argv[4];
1121
1122         if (!(argv[0] = find_hook("pre-push")))
1123                 return 0;
1124
1125         argv[1] = transport->remote->name;
1126         argv[2] = transport->url;
1127         argv[3] = NULL;
1128
1129         proc.argv = argv;
1130         proc.in = -1;
1131
1132         if (start_command(&proc)) {
1133                 finish_command(&proc);
1134                 return -1;
1135         }
1136
1137         sigchain_push(SIGPIPE, SIG_IGN);
1138
1139         strbuf_init(&buf, 256);
1140
1141         for (r = remote_refs; r; r = r->next) {
1142                 if (!r->peer_ref) continue;
1143                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1144                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1145                 if (r->status == REF_STATUS_UPTODATE) continue;
1146
1147                 strbuf_reset(&buf);
1148                 strbuf_addf( &buf, "%s %s %s %s\n",
1149                          r->peer_ref->name, oid_to_hex(&r->new_oid),
1150                          r->name, oid_to_hex(&r->old_oid));
1151
1152                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1153                         /* We do not mind if a hook does not read all refs. */
1154                         if (errno != EPIPE)
1155                                 ret = -1;
1156                         break;
1157                 }
1158         }
1159
1160         strbuf_release(&buf);
1161
1162         x = close(proc.in);
1163         if (!ret)
1164                 ret = x;
1165
1166         sigchain_pop(SIGPIPE);
1167
1168         x = finish_command(&proc);
1169         if (!ret)
1170                 ret = x;
1171
1172         return ret;
1173 }
1174
1175 int transport_push(struct transport *transport,
1176                    int refspec_nr, const char **refspec, int flags,
1177                    unsigned int *reject_reasons)
1178 {
1179         *reject_reasons = 0;
1180         transport_verify_remote_names(refspec_nr, refspec);
1181
1182         if (transport->push) {
1183                 /* Maybe FIXME. But no important transport uses this case. */
1184                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1185                         die("This transport does not support using --set-upstream");
1186                 if (flags & TRANSPORT_PUSH_SET_PUBLISH)
1187                         die("This transport does not support using --set-publish");
1188
1189                 return transport->push(transport, refspec_nr, refspec, flags);
1190         } else if (transport->push_refs) {
1191                 struct ref *remote_refs;
1192                 struct ref *local_refs = get_local_heads();
1193                 int match_flags = MATCH_REFS_NONE;
1194                 int verbose = (transport->verbose > 0);
1195                 int quiet = (transport->verbose < 0);
1196                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1197                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1198                 int push_ret, ret, err;
1199
1200                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1201                         return -1;
1202
1203                 remote_refs = transport->get_refs_list(transport, 1);
1204
1205                 if (flags & TRANSPORT_PUSH_ALL)
1206                         match_flags |= MATCH_REFS_ALL;
1207                 if (flags & TRANSPORT_PUSH_MIRROR)
1208                         match_flags |= MATCH_REFS_MIRROR;
1209                 if (flags & TRANSPORT_PUSH_PRUNE)
1210                         match_flags |= MATCH_REFS_PRUNE;
1211                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1212                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1213
1214                 if (match_push_refs(local_refs, &remote_refs,
1215                                     refspec_nr, refspec, match_flags)) {
1216                         return -1;
1217                 }
1218
1219                 if (transport->smart_options &&
1220                     transport->smart_options->cas &&
1221                     !is_empty_cas(transport->smart_options->cas))
1222                         apply_push_cas(transport->smart_options->cas,
1223                                        transport->remote, remote_refs);
1224
1225                 set_ref_status_for_push(remote_refs,
1226                         flags & TRANSPORT_PUSH_MIRROR,
1227                         flags & TRANSPORT_PUSH_FORCE);
1228
1229                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1230                         if (run_pre_push_hook(transport, remote_refs))
1231                                 return -1;
1232
1233                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1234                         struct ref *ref = remote_refs;
1235                         for (; ref; ref = ref->next)
1236                                 if (!is_null_oid(&ref->new_oid) &&
1237                                     !push_unpushed_submodules(ref->new_oid.hash,
1238                                             transport->remote->name))
1239                                     die ("Failed to push all needed submodules!");
1240                 }
1241
1242                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1243                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1244                         struct ref *ref = remote_refs;
1245                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1246
1247                         for (; ref; ref = ref->next)
1248                                 if (!is_null_oid(&ref->new_oid) &&
1249                                     find_unpushed_submodules(ref->new_oid.hash,
1250                                             transport->remote->name, &needs_pushing))
1251                                         die_with_unpushed_submodules(&needs_pushing);
1252                 }
1253
1254                 push_ret = transport->push_refs(transport, remote_refs, flags);
1255                 err = push_had_errors(remote_refs);
1256                 ret = push_ret | err;
1257
1258                 if (!quiet || err)
1259                         transport_print_push_status(transport->url, remote_refs,
1260                                         verbose | porcelain, porcelain,
1261                                         reject_reasons);
1262
1263                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1264                         set_tracking(transport, remote_refs, pretend, 0);
1265                 if (flags & TRANSPORT_PUSH_SET_PUBLISH)
1266                         set_tracking(transport, remote_refs, pretend, 1);
1267
1268                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1269                         struct ref *ref;
1270                         for (ref = remote_refs; ref; ref = ref->next)
1271                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1272                 }
1273
1274                 if (porcelain && !push_ret)
1275                         puts("Done");
1276                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1277                         fprintf(stderr, "Everything up-to-date\n");
1278
1279                 return ret;
1280         }
1281         return 1;
1282 }
1283
1284 const struct ref *transport_get_remote_refs(struct transport *transport)
1285 {
1286         if (!transport->got_remote_refs) {
1287                 transport->remote_refs = transport->get_refs_list(transport, 0);
1288                 transport->got_remote_refs = 1;
1289         }
1290
1291         return transport->remote_refs;
1292 }
1293
1294 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1295 {
1296         int rc;
1297         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1298         struct ref **heads = NULL;
1299         struct ref *rm;
1300
1301         for (rm = refs; rm; rm = rm->next) {
1302                 nr_refs++;
1303                 if (rm->peer_ref &&
1304                     !is_null_oid(&rm->old_oid) &&
1305                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1306                         continue;
1307                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1308                 heads[nr_heads++] = rm;
1309         }
1310
1311         if (!nr_heads) {
1312                 /*
1313                  * When deepening of a shallow repository is requested,
1314                  * then local and remote refs are likely to still be equal.
1315                  * Just feed them all to the fetch method in that case.
1316                  * This condition shouldn't be met in a non-deepening fetch
1317                  * (see builtin/fetch.c:quickfetch()).
1318                  */
1319                 heads = xmalloc(nr_refs * sizeof(*heads));
1320                 for (rm = refs; rm; rm = rm->next)
1321                         heads[nr_heads++] = rm;
1322         }
1323
1324         rc = transport->fetch(transport, nr_heads, heads);
1325
1326         free(heads);
1327         return rc;
1328 }
1329
1330 void transport_unlock_pack(struct transport *transport)
1331 {
1332         if (transport->pack_lockfile) {
1333                 unlink_or_warn(transport->pack_lockfile);
1334                 free(transport->pack_lockfile);
1335                 transport->pack_lockfile = NULL;
1336         }
1337 }
1338
1339 int transport_connect(struct transport *transport, const char *name,
1340                       const char *exec, int fd[2])
1341 {
1342         if (transport->connect)
1343                 return transport->connect(transport, name, exec, fd);
1344         else
1345                 die("Operation not supported by protocol");
1346 }
1347
1348 int transport_disconnect(struct transport *transport)
1349 {
1350         int ret = 0;
1351         if (transport->disconnect)
1352                 ret = transport->disconnect(transport);
1353         free(transport);
1354         return ret;
1355 }
1356
1357 /*
1358  * Strip username (and password) from a URL and return
1359  * it in a newly allocated string.
1360  */
1361 char *transport_anonymize_url(const char *url)
1362 {
1363         char *anon_url, *scheme_prefix, *anon_part;
1364         size_t anon_len, prefix_len = 0;
1365
1366         anon_part = strchr(url, '@');
1367         if (url_is_local_not_ssh(url) || !anon_part)
1368                 goto literal_copy;
1369
1370         anon_len = strlen(++anon_part);
1371         scheme_prefix = strstr(url, "://");
1372         if (!scheme_prefix) {
1373                 if (!strchr(anon_part, ':'))
1374                         /* cannot be "me@there:/path/name" */
1375                         goto literal_copy;
1376         } else {
1377                 const char *cp;
1378                 /* make sure scheme is reasonable */
1379                 for (cp = url; cp < scheme_prefix; cp++) {
1380                         switch (*cp) {
1381                                 /* RFC 1738 2.1 */
1382                         case '+': case '.': case '-':
1383                                 break; /* ok */
1384                         default:
1385                                 if (isalnum(*cp))
1386                                         break;
1387                                 /* it isn't */
1388                                 goto literal_copy;
1389                         }
1390                 }
1391                 /* @ past the first slash does not count */
1392                 cp = strchr(scheme_prefix + 3, '/');
1393                 if (cp && cp < anon_part)
1394                         goto literal_copy;
1395                 prefix_len = scheme_prefix - url + 3;
1396         }
1397         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1398         memcpy(anon_url, url, prefix_len);
1399         memcpy(anon_url + prefix_len, anon_part, anon_len);
1400         return anon_url;
1401 literal_copy:
1402         return xstrdup(url);
1403 }
1404
1405 struct alternate_refs_data {
1406         alternate_ref_fn *fn;
1407         void *data;
1408 };
1409
1410 static int refs_from_alternate_cb(struct alternate_object_database *e,
1411                                   void *data)
1412 {
1413         char *other;
1414         size_t len;
1415         struct remote *remote;
1416         struct transport *transport;
1417         const struct ref *extra;
1418         struct alternate_refs_data *cb = data;
1419
1420         e->name[-1] = '\0';
1421         other = xstrdup(real_path(e->base));
1422         e->name[-1] = '/';
1423         len = strlen(other);
1424
1425         while (other[len-1] == '/')
1426                 other[--len] = '\0';
1427         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1428                 goto out;
1429         /* Is this a git repository with refs? */
1430         memcpy(other + len - 8, "/refs", 6);
1431         if (!is_directory(other))
1432                 goto out;
1433         other[len - 8] = '\0';
1434         remote = remote_get(other);
1435         transport = transport_get(remote, other);
1436         for (extra = transport_get_remote_refs(transport);
1437              extra;
1438              extra = extra->next)
1439                 cb->fn(extra, cb->data);
1440         transport_disconnect(transport);
1441 out:
1442         free(other);
1443         return 0;
1444 }
1445
1446 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1447 {
1448         struct alternate_refs_data cb;
1449         cb.fn = fn;
1450         cb.data = data;
1451         foreach_alt_odb(refs_from_alternate_cb, &cb);
1452 }