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

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "run-command.h"
   4 #include "pkt-line.h"
   5 #include "fetch-pack.h"
   6 #include "remote.h"
   7 #include "connect.h"
   8 #include "send-pack.h"
   9 #include "walker.h"
  10 #include "bundle.h"
  11 #include "dir.h"
  12 #include "refs.h"
  13 #include "branch.h"
  14 #include "url.h"
  15 #include "submodule.h"
  16 #include "string-list.h"
  17 #include "sha1-array.h"
  18
  19 /* rsync support */
  20
  21 /*
  22  * We copy packed-refs and refs/ into a temporary file, then read the
  23  * loose refs recursively (sorting whenever possible), and then inserting
  24  * those packed refs that are not yet in the list (not validating, but
  25  * assuming that the file is sorted).
  26  *
  27  * Appears refactoring this from refs.c is too cumbersome.
  28  */
  29
  30 static int str_cmp(const void *a, const void *b)
  31 {
  32         const char *s1 = a;
  33         const char *s2 = b;
  34
  35         return strcmp(s1, s2);
  36 }
  37
  38 /* path->buf + name_offset is expected to point to "refs/" */
  39
  40 static int read_loose_refs(struct strbuf *path, int name_offset,
  41                 struct ref **tail)
  42 {
  43         DIR *dir = opendir(path->buf);
  44         struct dirent *de;
  45         struct {
  46                 char **entries;
  47                 int nr, alloc;
  48         } list;
  49         int i, pathlen;
  50
  51         if (!dir)
  52                 return -1;
  53
  54         memset (&list, 0, sizeof(list));
  55
  56         while ((de = readdir(dir))) {
  57                 if (is_dot_or_dotdot(de->d_name))
  58                         continue;
  59                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  60                 list.entries[list.nr++] = xstrdup(de->d_name);
  61         }
  62         closedir(dir);
  63
  64         /* sort the list */
  65
  66         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  67
  68         pathlen = path->len;
  69         strbuf_addch(path, '/');
  70
  71         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  72                 strbuf_addstr(path, list.entries[i]);
  73                 if (read_loose_refs(path, name_offset, tail)) {
  74                         int fd = open(path->buf, O_RDONLY);
  75                         char buffer[40];
  76                         struct ref *next;
  77
  78                         if (fd < 0)
  79                                 continue;
  80                         next = alloc_ref(path->buf + name_offset);
  81                         if (read_in_full(fd, buffer, 40) != 40 ||
  82                                         get_sha1_hex(buffer, next->old_sha1)) {
  83                                 close(fd);
  84                                 free(next);
  85                                 continue;
  86                         }
  87                         close(fd);
  88                         (*tail)->next = next;
  89                         *tail = next;
  90                 }
  91         }
  92         strbuf_setlen(path, pathlen);
  93
  94         for (i = 0; i < list.nr; i++)
  95                 free(list.entries[i]);
  96         free(list.entries);
  97
  98         return 0;
  99 }
 100
 101 /* insert the packed refs for which no loose refs were found */
 102
 103 static void insert_packed_refs(const char *packed_refs, struct ref **list)
 104 {
 105         FILE *f = fopen(packed_refs, "r");
 106         static char buffer[PATH_MAX];
 107
 108         if (!f)
 109                 return;
 110
 111         for (;;) {
 112                 int cmp = 0; /* assigned before used */
 113                 int len;
 114
 115                 if (!fgets(buffer, sizeof(buffer), f)) {
 116                         fclose(f);
 117                         return;
 118                 }
 119
 120                 if (!isxdigit(buffer[0]))
 121                         continue;
 122                 len = strlen(buffer);
 123                 if (len && buffer[len - 1] == '\n')
 124                         buffer[--len] = '\0';
 125                 if (len < 41)
 126                         continue;
 127                 while ((*list)->next &&
 128                                 (cmp = strcmp(buffer + 41,
 129                                       (*list)->next->name)) > 0)
 130                         list = &(*list)->next;
 131                 if (!(*list)->next || cmp < 0) {
 132                         struct ref *next = alloc_ref(buffer + 41);
 133                         buffer[40] = '\0';
 134                         if (get_sha1_hex(buffer, next->old_sha1)) {
 135                                 warning ("invalid SHA-1: %s", buffer);
 136                                 free(next);
 137                                 continue;
 138                         }
 139                         next->next = (*list)->next;
 140                         (*list)->next = next;
 141                         list = &(*list)->next;
 142                 }
 143         }
 144 }
 145
 146 static void set_upstreams(struct transport *transport, struct ref *refs,
 147         int pretend)
 148 {
 149         struct ref *ref;
 150         for (ref = refs; ref; ref = ref->next) {
 151                 const char *localname;
 152                 const char *tmp;
 153                 const char *remotename;
 154                 unsigned char sha[20];
 155                 int flag = 0;
 156                 /*
 157                  * Check suitability for tracking. Must be successful /
 158                  * already up-to-date ref create/modify (not delete).
 159                  */
 160                 if (ref->status != REF_STATUS_OK &&
 161                         ref->status != REF_STATUS_UPTODATE)
 162                         continue;
 163                 if (!ref->peer_ref)
 164                         continue;
 165                 if (is_null_sha1(ref->new_sha1))
 166                         continue;
 167
 168                 /* Follow symbolic refs (mainly for HEAD). */
 169                 localname = ref->peer_ref->name;
 170                 remotename = ref->name;
 171                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
 172                                          sha, &flag);
 173                 if (tmp && flag & REF_ISSYMREF &&
 174                         starts_with(tmp, "refs/heads/"))
 175                         localname = tmp;
 176
 177                 /* Both source and destination must be local branches. */
 178                 if (!localname || !starts_with(localname, "refs/heads/"))
 179                         continue;
 180                 if (!remotename || !starts_with(remotename, "refs/heads/"))
 181                         continue;
 182
 183                 if (!pretend)
 184                         install_branch_config(BRANCH_CONFIG_VERBOSE,
 185                                 localname + 11, transport->remote->name,
 186                                 remotename);
 187                 else
 188                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
 189                                 localname + 11, remotename + 11,
 190                                 transport->remote->name);
 191         }
 192 }
 193
 194 static const char *rsync_url(const char *url)
 195 {
 196         if (!starts_with(url, "rsync://"))
 197                 skip_prefix(url, "rsync:", &url);
 198         return url;
 199 }
 200
 201 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 202 {
 203         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 204         struct ref dummy = {NULL}, *tail = &dummy;
 205         struct child_process rsync = CHILD_PROCESS_INIT;
 206         const char *args[5];
 207         int temp_dir_len;
 208
 209         if (for_push)
 210                 return NULL;
 211
 212         /* copy the refs to the temporary directory */
 213
 214         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 215         if (!mkdtemp(temp_dir.buf))
 216                 die_errno ("Could not make temporary directory");
 217         temp_dir_len = temp_dir.len;
 218
 219         strbuf_addstr(&buf, rsync_url(transport->url));
 220         strbuf_addstr(&buf, "/refs");
 221
 222         rsync.argv = args;
 223         rsync.stdout_to_stderr = 1;
 224         args[0] = "rsync";
 225         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 226         args[2] = buf.buf;
 227         args[3] = temp_dir.buf;
 228         args[4] = NULL;
 229
 230         if (run_command(&rsync))
 231                 die ("Could not run rsync to get refs");
 232
 233         strbuf_reset(&buf);
 234         strbuf_addstr(&buf, rsync_url(transport->url));
 235         strbuf_addstr(&buf, "/packed-refs");
 236
 237         args[2] = buf.buf;
 238
 239         if (run_command(&rsync))
 240                 die ("Could not run rsync to get refs");
 241
 242         /* read the copied refs */
 243
 244         strbuf_addstr(&temp_dir, "/refs");
 245         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 246         strbuf_setlen(&temp_dir, temp_dir_len);
 247
 248         tail = &dummy;
 249         strbuf_addstr(&temp_dir, "/packed-refs");
 250         insert_packed_refs(temp_dir.buf, &tail);
 251         strbuf_setlen(&temp_dir, temp_dir_len);
 252
 253         if (remove_dir_recursively(&temp_dir, 0))
 254                 warning ("Error removing temporary directory %s.",
 255                                 temp_dir.buf);
 256
 257         strbuf_release(&buf);
 258         strbuf_release(&temp_dir);
 259
 260         return dummy.next;
 261 }
 262
 263 static int fetch_objs_via_rsync(struct transport *transport,
 264                                 int nr_objs, struct ref **to_fetch)
 265 {
 266         struct child_process rsync = CHILD_PROCESS_INIT;
 267
 268         rsync.stdout_to_stderr = 1;
 269         argv_array_push(&rsync.args, "rsync");
 270         argv_array_push(&rsync.args, (transport->verbose > 1) ? "-rv" : "-r");
 271         argv_array_push(&rsync.args, "--ignore-existing");
 272         argv_array_push(&rsync.args, "--exclude");
 273         argv_array_push(&rsync.args, "info");
 274         argv_array_pushf(&rsync.args, "%s/objects/", rsync_url(transport->url));
 275         argv_array_push(&rsync.args, get_object_directory());
 276
 277         /* NEEDSWORK: handle one level of alternates */
 278         return run_command(&rsync);
 279 }
 280
 281 static int write_one_ref(const char *name, const struct object_id *oid,
 282                          int flags, void *data)
 283 {
 284         struct strbuf *buf = data;
 285         int len = buf->len;
 286
 287         /* when called via for_each_ref(), flags is non-zero */
 288         if (flags && !starts_with(name, "refs/heads/") &&
 289                         !starts_with(name, "refs/tags/"))
 290                 return 0;
 291
 292         strbuf_addstr(buf, name);
 293         if (safe_create_leading_directories(buf->buf) ||
 294             write_file_gently(buf->buf, "%s", oid_to_hex(oid)))
 295                 return error("problems writing temporary file %s: %s",
 296                              buf->buf, strerror(errno));
 297         strbuf_setlen(buf, len);
 298         return 0;
 299 }
 300
 301 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 302                                   int refspec_nr, const char **refspec)
 303 {
 304         int i;
 305
 306         for (i = 0; i < refspec_nr; i++) {
 307                 struct object_id oid;
 308                 char *ref;
 309
 310                 if (dwim_ref(refspec[i], strlen(refspec[i]), oid.hash, &ref) != 1)
 311                         return error("Could not get ref %s", refspec[i]);
 312
 313                 if (write_one_ref(ref, &oid, 0, temp_dir)) {
 314                         free(ref);
 315                         return -1;
 316                 }
 317                 free(ref);
 318         }
 319         return 0;
 320 }
 321
 322 static int rsync_transport_push(struct transport *transport,
 323                 int refspec_nr, const char **refspec, int flags)
 324 {
 325         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 326         int result = 0, i;
 327         struct child_process rsync = CHILD_PROCESS_INIT;
 328         const char *args[10];
 329
 330         if (flags & TRANSPORT_PUSH_MIRROR)
 331                 return error("rsync transport does not support mirror mode");
 332
 333         /* first push the objects */
 334
 335         strbuf_addstr(&buf, rsync_url(transport->url));
 336         strbuf_addch(&buf, '/');
 337
 338         rsync.argv = args;
 339         rsync.stdout_to_stderr = 1;
 340         i = 0;
 341         args[i++] = "rsync";
 342         args[i++] = "-a";
 343         if (flags & TRANSPORT_PUSH_DRY_RUN)
 344                 args[i++] = "--dry-run";
 345         if (transport->verbose > 1)
 346                 args[i++] = "-v";
 347         args[i++] = "--ignore-existing";
 348         args[i++] = "--exclude";
 349         args[i++] = "info";
 350         args[i++] = get_object_directory();
 351         args[i++] = buf.buf;
 352         args[i++] = NULL;
 353
 354         if (run_command(&rsync))
 355                 return error("Could not push objects to %s",
 356                                 rsync_url(transport->url));
 357
 358         /* copy the refs to the temporary directory; they could be packed. */
 359
 360         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 361         if (!mkdtemp(temp_dir.buf))
 362                 die_errno ("Could not make temporary directory");
 363         strbuf_addch(&temp_dir, '/');
 364
 365         if (flags & TRANSPORT_PUSH_ALL) {
 366                 if (for_each_ref(write_one_ref, &temp_dir))
 367                         return -1;
 368         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 369                 return -1;
 370
 371         i = 2;
 372         if (flags & TRANSPORT_PUSH_DRY_RUN)
 373                 args[i++] = "--dry-run";
 374         if (!(flags & TRANSPORT_PUSH_FORCE))
 375                 args[i++] = "--ignore-existing";
 376         args[i++] = temp_dir.buf;
 377         args[i++] = rsync_url(transport->url);
 378         args[i++] = NULL;
 379         if (run_command(&rsync))
 380                 result = error("Could not push to %s",
 381                                 rsync_url(transport->url));
 382
 383         if (remove_dir_recursively(&temp_dir, 0))
 384                 warning ("Could not remove temporary directory %s.",
 385                                 temp_dir.buf);
 386
 387         strbuf_release(&buf);
 388         strbuf_release(&temp_dir);
 389
 390         return result;
 391 }
 392
 393 struct bundle_transport_data {
 394         int fd;
 395         struct bundle_header header;
 396 };
 397
 398 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 399 {
 400         struct bundle_transport_data *data = transport->data;
 401         struct ref *result = NULL;
 402         int i;
 403
 404         if (for_push)
 405                 return NULL;
 406
 407         if (data->fd > 0)
 408                 close(data->fd);
 409         data->fd = read_bundle_header(transport->url, &data->header);
 410         if (data->fd < 0)
 411                 die ("Could not read bundle '%s'.", transport->url);
 412         for (i = 0; i < data->header.references.nr; i++) {
 413                 struct ref_list_entry *e = data->header.references.list + i;
 414                 struct ref *ref = alloc_ref(e->name);
 415                 hashcpy(ref->old_sha1, e->sha1);
 416                 ref->next = result;
 417                 result = ref;
 418         }
 419         return result;
 420 }
 421
 422 static int fetch_refs_from_bundle(struct transport *transport,
 423                                int nr_heads, struct ref **to_fetch)
 424 {
 425         struct bundle_transport_data *data = transport->data;
 426         return unbundle(&data->header, data->fd,
 427                         transport->progress ? BUNDLE_VERBOSE : 0);
 428 }
 429
 430 static int close_bundle(struct transport *transport)
 431 {
 432         struct bundle_transport_data *data = transport->data;
 433         if (data->fd > 0)
 434                 close(data->fd);
 435         free(data);
 436         return 0;
 437 }
 438
 439 struct git_transport_data {
 440         struct git_transport_options options;
 441         struct child_process *conn;
 442         int fd[2];
 443         unsigned got_remote_heads : 1;
 444         struct sha1_array extra_have;
 445         struct sha1_array shallow;
 446 };
 447
 448 static int set_git_option(struct git_transport_options *opts,
 449                           const char *name, const char *value)
 450 {
 451         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 452                 opts->uploadpack = value;
 453                 return 0;
 454         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 455                 opts->receivepack = value;
 456                 return 0;
 457         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 458                 opts->thin = !!value;
 459                 return 0;
 460         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 461                 opts->followtags = !!value;
 462                 return 0;
 463         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 464                 opts->keep = !!value;
 465                 return 0;
 466         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 467                 opts->update_shallow = !!value;
 468                 return 0;
 469         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 470                 if (!value)
 471                         opts->depth = 0;
 472                 else {
 473                         char *end;
 474                         opts->depth = strtol(value, &end, 0);
 475                         if (*end)
 476                                 die("transport: invalid depth option '%s'", value);
 477                 }
 478                 return 0;
 479         }
 480         return 1;
 481 }
 482
 483 static int connect_setup(struct transport *transport, int for_push, int verbose)
 484 {
 485         struct git_transport_data *data = transport->data;
 486
 487         if (data->conn)
 488                 return 0;
 489
 490         data->conn = git_connect(data->fd, transport->url,
 491                                  for_push ? data->options.receivepack :
 492                                  data->options.uploadpack,
 493                                  verbose ? CONNECT_VERBOSE : 0);
 494
 495         return 0;
 496 }
 497
 498 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 499 {
 500         struct git_transport_data *data = transport->data;
 501         struct ref *refs;
 502
 503         connect_setup(transport, for_push, 0);
 504         get_remote_heads(data->fd[0], NULL, 0, &refs,
 505                          for_push ? REF_NORMAL : 0,
 506                          &data->extra_have,
 507                          &data->shallow);
 508         data->got_remote_heads = 1;
 509
 510         return refs;
 511 }
 512
 513 static int fetch_refs_via_pack(struct transport *transport,
 514                                int nr_heads, struct ref **to_fetch)
 515 {
 516         struct git_transport_data *data = transport->data;
 517         struct ref *refs;
 518         char *dest = xstrdup(transport->url);
 519         struct fetch_pack_args args;
 520         struct ref *refs_tmp = NULL;
 521
 522         memset(&args, 0, sizeof(args));
 523         args.uploadpack = data->options.uploadpack;
 524         args.keep_pack = data->options.keep;
 525         args.lock_pack = 1;
 526         args.use_thin_pack = data->options.thin;
 527         args.include_tag = data->options.followtags;
 528         args.verbose = (transport->verbose > 1);
 529         args.quiet = (transport->verbose < 0);
 530         args.no_progress = !transport->progress;
 531         args.depth = data->options.depth;
 532         args.check_self_contained_and_connected =
 533                 data->options.check_self_contained_and_connected;
 534         args.cloning = transport->cloning;
 535         args.update_shallow = data->options.update_shallow;
 536
 537         if (!data->got_remote_heads) {
 538                 connect_setup(transport, 0, 0);
 539                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 540                                  NULL, &data->shallow);
 541                 data->got_remote_heads = 1;
 542         }
 543
 544         refs = fetch_pack(&args, data->fd, data->conn,
 545                           refs_tmp ? refs_tmp : transport->remote_refs,
 546                           dest, to_fetch, nr_heads, &data->shallow,
 547                           &transport->pack_lockfile);
 548         close(data->fd[0]);
 549         close(data->fd[1]);
 550         if (finish_connect(data->conn)) {
 551                 free_refs(refs);
 552                 refs = NULL;
 553         }
 554         data->conn = NULL;
 555         data->got_remote_heads = 0;
 556         data->options.self_contained_and_connected =
 557                 args.self_contained_and_connected;
 558
 559         free_refs(refs_tmp);
 560         free_refs(refs);
 561         free(dest);
 562         return (refs ? 0 : -1);
 563 }
 564
 565 static int push_had_errors(struct ref *ref)
 566 {
 567         for (; ref; ref = ref->next) {
 568                 switch (ref->status) {
 569                 case REF_STATUS_NONE:
 570                 case REF_STATUS_UPTODATE:
 571                 case REF_STATUS_OK:
 572                         break;
 573                 default:
 574                         return 1;
 575                 }
 576         }
 577         return 0;
 578 }
 579
 580 int transport_refs_pushed(struct ref *ref)
 581 {
 582         for (; ref; ref = ref->next) {
 583                 switch(ref->status) {
 584                 case REF_STATUS_NONE:
 585                 case REF_STATUS_UPTODATE:
 586                         break;
 587                 default:
 588                         return 1;
 589                 }
 590         }
 591         return 0;
 592 }
 593
 594 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 595 {
 596         struct refspec rs;
 597
 598         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 599                 return;
 600
 601         rs.src = ref->name;
 602         rs.dst = NULL;
 603
 604         if (!remote_find_tracking(remote, &rs)) {
 605                 if (verbose)
 606                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 607                 if (ref->deletion) {
 608                         delete_ref(rs.dst, NULL, 0);
 609                 } else
 610                         update_ref("update by push", rs.dst,
 611                                         ref->new_sha1, NULL, 0, 0);
 612                 free(rs.dst);
 613         }
 614 }
 615
 616 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 617 {
 618         if (porcelain) {
 619                 if (from)
 620                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 621                 else
 622                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 623                 if (msg)
 624                         fprintf(stdout, "%s (%s)\n", summary, msg);
 625                 else
 626                         fprintf(stdout, "%s\n", summary);
 627         } else {
 628                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 629                 if (from)
 630                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 631                 else
 632                         fputs(prettify_refname(to->name), stderr);
 633                 if (msg) {
 634                         fputs(" (", stderr);
 635                         fputs(msg, stderr);
 636                         fputc(')', stderr);
 637                 }
 638                 fputc('\n', stderr);
 639         }
 640 }
 641
 642 static const char *status_abbrev(unsigned char sha1[20])
 643 {
 644         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 645 }
 646
 647 static void print_ok_ref_status(struct ref *ref, int porcelain)
 648 {
 649         if (ref->deletion)
 650                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 651         else if (is_null_sha1(ref->old_sha1))
 652                 print_ref_status('*',
 653                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 654                         "[new branch]"),
 655                         ref, ref->peer_ref, NULL, porcelain);
 656         else {
 657                 struct strbuf quickref = STRBUF_INIT;
 658                 char type;
 659                 const char *msg;
 660
 661                 strbuf_addstr(&quickref, status_abbrev(ref->old_sha1));
 662                 if (ref->forced_update) {
 663                         strbuf_addstr(&quickref, "...");
 664                         type = '+';
 665                         msg = "forced update";
 666                 } else {
 667                         strbuf_addstr(&quickref, "..");
 668                         type = ' ';
 669                         msg = NULL;
 670                 }
 671                 strbuf_addstr(&quickref, status_abbrev(ref->new_sha1));
 672
 673                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg, porcelain);
 674                 strbuf_release(&quickref);
 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 struct transport *transport_get(struct remote *remote, const char *url)
 920 {
 921         const char *helper;
 922         struct transport *ret = xcalloc(1, sizeof(*ret));
 923
 924         ret->progress = isatty(2);
 925
 926         if (!remote)
 927                 die("No remote provided to transport_get()");
 928
 929         ret->got_remote_refs = 0;
 930         ret->remote = remote;
 931         helper = remote->foreign_vcs;
 932
 933         if (!url && remote->url)
 934                 url = remote->url[0];
 935         ret->url = url;
 936
 937         /* maybe it is a foreign URL? */
 938         if (url) {
 939                 const char *p = url;
 940
 941                 while (is_urlschemechar(p == url, *p))
 942                         p++;
 943                 if (starts_with(p, "::"))
 944                         helper = xstrndup(url, p - url);
 945         }
 946
 947         if (helper) {
 948                 transport_helper_init(ret, helper);
 949         } else if (starts_with(url, "rsync:")) {
 950                 ret->get_refs_list = get_refs_via_rsync;
 951                 ret->fetch = fetch_objs_via_rsync;
 952                 ret->push = rsync_transport_push;
 953                 ret->smart_options = NULL;
 954         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 955                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 956                 ret->data = data;
 957                 ret->get_refs_list = get_refs_from_bundle;
 958                 ret->fetch = fetch_refs_from_bundle;
 959                 ret->disconnect = close_bundle;
 960                 ret->smart_options = NULL;
 961         } else if (!is_url(url)
 962                 || starts_with(url, "file://")
 963                 || starts_with(url, "git://")
 964                 || starts_with(url, "ssh://")
 965                 || starts_with(url, "git+ssh://")
 966                 || starts_with(url, "ssh+git://")) {
 967                 /* These are builtin smart transports. */
 968                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 969                 ret->data = data;
 970                 ret->set_option = NULL;
 971                 ret->get_refs_list = get_refs_via_connect;
 972                 ret->fetch = fetch_refs_via_pack;
 973                 ret->push_refs = git_transport_push;
 974                 ret->connect = connect_git;
 975                 ret->disconnect = disconnect_git;
 976                 ret->smart_options = &(data->options);
 977
 978                 data->conn = NULL;
 979                 data->got_remote_heads = 0;
 980         } else {
 981                 /* Unknown protocol in URL. Pass to external handler. */
 982                 int len = external_specification_len(url);
 983                 char *handler = xmemdupz(url, len);
 984                 transport_helper_init(ret, handler);
 985         }
 986
 987         if (ret->smart_options) {
 988                 ret->smart_options->thin = 1;
 989                 ret->smart_options->uploadpack = "git-upload-pack";
 990                 if (remote->uploadpack)
 991                         ret->smart_options->uploadpack = remote->uploadpack;
 992                 ret->smart_options->receivepack = "git-receive-pack";
 993                 if (remote->receivepack)
 994                         ret->smart_options->receivepack = remote->receivepack;
 995         }
 996
 997         return ret;
 998 }
 999
1000 int transport_set_option(struct transport *transport,
1001                          const char *name, const char *value)
1002 {
1003         int git_reports = 1, protocol_reports = 1;
1004
1005         if (transport->smart_options)
1006                 git_reports = set_git_option(transport->smart_options,
1007                                              name, value);
1008
1009         if (transport->set_option)
1010                 protocol_reports = transport->set_option(transport, name,
1011                                                         value);
1012
1013         /* If either report is 0, report 0 (success). */
1014         if (!git_reports || !protocol_reports)
1015                 return 0;
1016         /* If either reports -1 (invalid value), report -1. */
1017         if ((git_reports == -1) || (protocol_reports == -1))
1018                 return -1;
1019         /* Otherwise if both report unknown, report unknown. */
1020         return 1;
1021 }
1022
1023 void transport_set_verbosity(struct transport *transport, int verbosity,
1024         int force_progress)
1025 {
1026         if (verbosity >= 1)
1027                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1028         if (verbosity < 0)
1029                 transport->verbose = -1;
1030
1031         /**
1032          * Rules used to determine whether to report progress (processing aborts
1033          * when a rule is satisfied):
1034          *
1035          *   . Report progress, if force_progress is 1 (ie. --progress).
1036          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1037          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1038          *   . Report progress if isatty(2) is 1.
1039          **/
1040         if (force_progress >= 0)
1041                 transport->progress = !!force_progress;
1042         else
1043                 transport->progress = verbosity >= 0 && isatty(2);
1044 }
1045
1046 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1047 {
1048         int i;
1049
1050         fprintf(stderr, "The following submodule paths contain changes that can\n"
1051                         "not be found on any remote:\n");
1052         for (i = 0; i < needs_pushing->nr; i++)
1053                 printf("  %s\n", needs_pushing->items[i].string);
1054         fprintf(stderr, "\nPlease try\n\n"
1055                         "       git push --recurse-submodules=on-demand\n\n"
1056                         "or cd to the path and use\n\n"
1057                         "       git push\n\n"
1058                         "to push them to a remote.\n\n");
1059
1060         string_list_clear(needs_pushing, 0);
1061
1062         die("Aborting.");
1063 }
1064
1065 static int run_pre_push_hook(struct transport *transport,
1066                              struct ref *remote_refs)
1067 {
1068         int ret = 0, x;
1069         struct ref *r;
1070         struct child_process proc = CHILD_PROCESS_INIT;
1071         struct strbuf buf;
1072         const char *argv[4];
1073
1074         if (!(argv[0] = find_hook("pre-push")))
1075                 return 0;
1076
1077         argv[1] = transport->remote->name;
1078         argv[2] = transport->url;
1079         argv[3] = NULL;
1080
1081         proc.argv = argv;
1082         proc.in = -1;
1083
1084         if (start_command(&proc)) {
1085                 finish_command(&proc);
1086                 return -1;
1087         }
1088
1089         strbuf_init(&buf, 256);
1090
1091         for (r = remote_refs; r; r = r->next) {
1092                 if (!r->peer_ref) continue;
1093                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1094                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1095                 if (r->status == REF_STATUS_UPTODATE) continue;
1096
1097                 strbuf_reset(&buf);
1098                 strbuf_addf( &buf, "%s %s %s %s\n",
1099                          r->peer_ref->name, sha1_to_hex(r->new_sha1),
1100                          r->name, sha1_to_hex(r->old_sha1));
1101
1102                 if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1103                         ret = -1;
1104                         break;
1105                 }
1106         }
1107
1108         strbuf_release(&buf);
1109
1110         x = close(proc.in);
1111         if (!ret)
1112                 ret = x;
1113
1114         x = finish_command(&proc);
1115         if (!ret)
1116                 ret = x;
1117
1118         return ret;
1119 }
1120
1121 int transport_push(struct transport *transport,
1122                    int refspec_nr, const char **refspec, int flags,
1123                    unsigned int *reject_reasons)
1124 {
1125         *reject_reasons = 0;
1126         transport_verify_remote_names(refspec_nr, refspec);
1127
1128         if (transport->push) {
1129                 /* Maybe FIXME. But no important transport uses this case. */
1130                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1131                         die("This transport does not support using --set-upstream");
1132
1133                 return transport->push(transport, refspec_nr, refspec, flags);
1134         } else if (transport->push_refs) {
1135                 struct ref *remote_refs;
1136                 struct ref *local_refs = get_local_heads();
1137                 int match_flags = MATCH_REFS_NONE;
1138                 int verbose = (transport->verbose > 0);
1139                 int quiet = (transport->verbose < 0);
1140                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1141                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1142                 int push_ret, ret, err;
1143
1144                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1145                         return -1;
1146
1147                 remote_refs = transport->get_refs_list(transport, 1);
1148
1149                 if (flags & TRANSPORT_PUSH_ALL)
1150                         match_flags |= MATCH_REFS_ALL;
1151                 if (flags & TRANSPORT_PUSH_MIRROR)
1152                         match_flags |= MATCH_REFS_MIRROR;
1153                 if (flags & TRANSPORT_PUSH_PRUNE)
1154                         match_flags |= MATCH_REFS_PRUNE;
1155                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1156                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1157
1158                 if (match_push_refs(local_refs, &remote_refs,
1159                                     refspec_nr, refspec, match_flags)) {
1160                         return -1;
1161                 }
1162
1163                 if (transport->smart_options &&
1164                     transport->smart_options->cas &&
1165                     !is_empty_cas(transport->smart_options->cas))
1166                         apply_push_cas(transport->smart_options->cas,
1167                                        transport->remote, remote_refs);
1168
1169                 set_ref_status_for_push(remote_refs,
1170                         flags & TRANSPORT_PUSH_MIRROR,
1171                         flags & TRANSPORT_PUSH_FORCE);
1172
1173                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1174                         if (run_pre_push_hook(transport, remote_refs))
1175                                 return -1;
1176
1177                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1178                         struct ref *ref = remote_refs;
1179                         for (; ref; ref = ref->next)
1180                                 if (!is_null_sha1(ref->new_sha1) &&
1181                                     !push_unpushed_submodules(ref->new_sha1,
1182                                             transport->remote->name))
1183                                     die ("Failed to push all needed submodules!");
1184                 }
1185
1186                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1187                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1188                         struct ref *ref = remote_refs;
1189                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1190
1191                         for (; ref; ref = ref->next)
1192                                 if (!is_null_sha1(ref->new_sha1) &&
1193                                     find_unpushed_submodules(ref->new_sha1,
1194                                             transport->remote->name, &needs_pushing))
1195                                         die_with_unpushed_submodules(&needs_pushing);
1196                 }
1197
1198                 push_ret = transport->push_refs(transport, remote_refs, flags);
1199                 err = push_had_errors(remote_refs);
1200                 ret = push_ret | err;
1201
1202                 if (!quiet || err)
1203                         transport_print_push_status(transport->url, remote_refs,
1204                                         verbose | porcelain, porcelain,
1205                                         reject_reasons);
1206
1207                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1208                         set_upstreams(transport, remote_refs, pretend);
1209
1210                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1211                         struct ref *ref;
1212                         for (ref = remote_refs; ref; ref = ref->next)
1213                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1214                 }
1215
1216                 if (porcelain && !push_ret)
1217                         puts("Done");
1218                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1219                         fprintf(stderr, "Everything up-to-date\n");
1220
1221                 return ret;
1222         }
1223         return 1;
1224 }
1225
1226 const struct ref *transport_get_remote_refs(struct transport *transport)
1227 {
1228         if (!transport->got_remote_refs) {
1229                 transport->remote_refs = transport->get_refs_list(transport, 0);
1230                 transport->got_remote_refs = 1;
1231         }
1232
1233         return transport->remote_refs;
1234 }
1235
1236 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1237 {
1238         int rc;
1239         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1240         struct ref **heads = NULL;
1241         struct ref *rm;
1242
1243         for (rm = refs; rm; rm = rm->next) {
1244                 nr_refs++;
1245                 if (rm->peer_ref &&
1246                     !is_null_sha1(rm->old_sha1) &&
1247                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1248                         continue;
1249                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1250                 heads[nr_heads++] = rm;
1251         }
1252
1253         if (!nr_heads) {
1254                 /*
1255                  * When deepening of a shallow repository is requested,
1256                  * then local and remote refs are likely to still be equal.
1257                  * Just feed them all to the fetch method in that case.
1258                  * This condition shouldn't be met in a non-deepening fetch
1259                  * (see builtin/fetch.c:quickfetch()).
1260                  */
1261                 heads = xmalloc(nr_refs * sizeof(*heads));
1262                 for (rm = refs; rm; rm = rm->next)
1263                         heads[nr_heads++] = rm;
1264         }
1265
1266         rc = transport->fetch(transport, nr_heads, heads);
1267
1268         free(heads);
1269         return rc;
1270 }
1271
1272 void transport_unlock_pack(struct transport *transport)
1273 {
1274         if (transport->pack_lockfile) {
1275                 unlink_or_warn(transport->pack_lockfile);
1276                 free(transport->pack_lockfile);
1277                 transport->pack_lockfile = NULL;
1278         }
1279 }
1280
1281 int transport_connect(struct transport *transport, const char *name,
1282                       const char *exec, int fd[2])
1283 {
1284         if (transport->connect)
1285                 return transport->connect(transport, name, exec, fd);
1286         else
1287                 die("Operation not supported by protocol");
1288 }
1289
1290 int transport_disconnect(struct transport *transport)
1291 {
1292         int ret = 0;
1293         if (transport->disconnect)
1294                 ret = transport->disconnect(transport);
1295         free(transport);
1296         return ret;
1297 }
1298
1299 /*
1300  * Strip username (and password) from a URL and return
1301  * it in a newly allocated string.
1302  */
1303 char *transport_anonymize_url(const char *url)
1304 {
1305         char *anon_url, *scheme_prefix, *anon_part;
1306         size_t anon_len, prefix_len = 0;
1307
1308         anon_part = strchr(url, '@');
1309         if (url_is_local_not_ssh(url) || !anon_part)
1310                 goto literal_copy;
1311
1312         anon_len = strlen(++anon_part);
1313         scheme_prefix = strstr(url, "://");
1314         if (!scheme_prefix) {
1315                 if (!strchr(anon_part, ':'))
1316                         /* cannot be "me@there:/path/name" */
1317                         goto literal_copy;
1318         } else {
1319                 const char *cp;
1320                 /* make sure scheme is reasonable */
1321                 for (cp = url; cp < scheme_prefix; cp++) {
1322                         switch (*cp) {
1323                                 /* RFC 1738 2.1 */
1324                         case '+': case '.': case '-':
1325                                 break; /* ok */
1326                         default:
1327                                 if (isalnum(*cp))
1328                                         break;
1329                                 /* it isn't */
1330                                 goto literal_copy;
1331                         }
1332                 }
1333                 /* @ past the first slash does not count */
1334                 cp = strchr(scheme_prefix + 3, '/');
1335                 if (cp && cp < anon_part)
1336                         goto literal_copy;
1337                 prefix_len = scheme_prefix - url + 3;
1338         }
1339         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1340         memcpy(anon_url, url, prefix_len);
1341         memcpy(anon_url + prefix_len, anon_part, anon_len);
1342         return anon_url;
1343 literal_copy:
1344         return xstrdup(url);
1345 }
1346
1347 struct alternate_refs_data {
1348         alternate_ref_fn *fn;
1349         void *data;
1350 };
1351
1352 static int refs_from_alternate_cb(struct alternate_object_database *e,
1353                                   void *data)
1354 {
1355         char *other;
1356         size_t len;
1357         struct remote *remote;
1358         struct transport *transport;
1359         const struct ref *extra;
1360         struct alternate_refs_data *cb = data;
1361
1362         e->name[-1] = '\0';
1363         other = xstrdup(real_path(e->base));
1364         e->name[-1] = '/';
1365         len = strlen(other);
1366
1367         while (other[len-1] == '/')
1368                 other[--len] = '\0';
1369         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1370                 goto out;
1371         /* Is this a git repository with refs? */
1372         memcpy(other + len - 8, "/refs", 6);
1373         if (!is_directory(other))
1374                 goto out;
1375         other[len - 8] = '\0';
1376         remote = remote_get(other);
1377         transport = transport_get(remote, other);
1378         for (extra = transport_get_remote_refs(transport);
1379              extra;
1380              extra = extra->next)
1381                 cb->fn(extra, cb->data);
1382         transport_disconnect(transport);
1383 out:
1384         free(other);
1385         return 0;
1386 }
1387
1388 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1389 {
1390         struct alternate_refs_data cb;
1391         cb.fn = fn;
1392         cb.data = data;
1393         foreach_alt_odb(refs_from_alternate_cb, &cb);
1394 }