upload-pack.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "pkt-line.h"
   4 #include "sideband.h"
   5 #include "tag.h"
   6 #include "object.h"
   7 #include "commit.h"
   8 #include "exec_cmd.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "list-objects.h"
  12 #include "run-command.h"
  13
  14 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  15
  16 /* bits #0..7 in revision.h, #8..10 in commit.c */
  17 #define THEY_HAVE       (1u << 11)
  18 #define OUR_REF         (1u << 12)
  19 #define WANTED          (1u << 13)
  20 #define COMMON_KNOWN    (1u << 14)
  21 #define REACHABLE       (1u << 15)
  22
  23 #define SHALLOW         (1u << 16)
  24 #define NOT_SHALLOW     (1u << 17)
  25 #define CLIENT_SHALLOW  (1u << 18)
  26
  27 static unsigned long oldest_have;
  28
  29 static int multi_ack, nr_our_refs;
  30 static int no_done;
  31 static int use_thin_pack, use_ofs_delta, use_include_tag;
  32 static int no_progress, daemon_mode;
  33 static int shallow_nr;
  34 static struct object_array have_obj;
  35 static struct object_array want_obj;
  36 static struct object_array extra_edge_obj;
  37 static unsigned int timeout;
  38 /* 0 for no sideband,
  39  * otherwise maximum packet size (up to 65520 bytes).
  40  */
  41 static int use_sideband;
  42 static int debug_fd;
  43 static int advertise_refs;
  44 static int stateless_rpc;
  45
  46 static void reset_timeout(void)
  47 {
  48         alarm(timeout);
  49 }
  50
  51 static int strip(char *line, int len)
  52 {
  53         if (len && line[len-1] == '\n')
  54                 line[--len] = 0;
  55         return len;
  56 }
  57
  58 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  59 {
  60         if (use_sideband)
  61                 return send_sideband(1, fd, data, sz, use_sideband);
  62         if (fd == 3)
  63                 /* emergency quit */
  64                 fd = 2;
  65         if (fd == 2) {
  66                 /* XXX: are we happy to lose stuff here? */
  67                 xwrite(fd, data, sz);
  68                 return sz;
  69         }
  70         return safe_write(fd, data, sz);
  71 }
  72
  73 static FILE *pack_pipe = NULL;
  74 static void show_commit(struct commit *commit, void *data)
  75 {
  76         if (commit->object.flags & BOUNDARY)
  77                 fputc('-', pack_pipe);
  78         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
  79                 die("broken output pipe");
  80         fputc('\n', pack_pipe);
  81         fflush(pack_pipe);
  82         free(commit->buffer);
  83         commit->buffer = NULL;
  84 }
  85
  86 static void show_object(struct object *obj,
  87                         const struct name_path *path, const char *component,
  88                         void *cb_data)
  89 {
  90         show_object_with_name(pack_pipe, obj, path, component);
  91 }
  92
  93 static void show_edge(struct commit *commit)
  94 {
  95         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
  96 }
  97
  98 static int do_rev_list(int in, int out, void *user_data)
  99 {
 100         int i;
 101         struct rev_info revs;
 102
 103         pack_pipe = xfdopen(out, "w");
 104         init_revisions(&revs, NULL);
 105         revs.tag_objects = 1;
 106         revs.tree_objects = 1;
 107         revs.blob_objects = 1;
 108         if (use_thin_pack)
 109                 revs.edge_hint = 1;
 110
 111         for (i = 0; i < want_obj.nr; i++) {
 112                 struct object *o = want_obj.objects[i].item;
 113                 /* why??? */
 114                 o->flags &= ~UNINTERESTING;
 115                 add_pending_object(&revs, o, NULL);
 116         }
 117         for (i = 0; i < have_obj.nr; i++) {
 118                 struct object *o = have_obj.objects[i].item;
 119                 o->flags |= UNINTERESTING;
 120                 add_pending_object(&revs, o, NULL);
 121         }
 122         setup_revisions(0, NULL, &revs, NULL);
 123         if (prepare_revision_walk(&revs))
 124                 die("revision walk setup failed");
 125         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 126         if (use_thin_pack)
 127                 for (i = 0; i < extra_edge_obj.nr; i++)
 128                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
 129                                         extra_edge_obj.objects[i].item->sha1));
 130         traverse_commit_list(&revs, show_commit, show_object, NULL);
 131         fflush(pack_pipe);
 132         fclose(pack_pipe);
 133         return 0;
 134 }
 135
 136 static void create_pack_file(void)
 137 {
 138         struct async rev_list;
 139         struct child_process pack_objects;
 140         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
 141         char data[8193], progress[128];
 142         char abort_msg[] = "aborting due to possible repository "
 143                 "corruption on the remote side.";
 144         int buffered = -1;
 145         ssize_t sz;
 146         const char *argv[10];
 147         int arg = 0;
 148
 149         argv[arg++] = "pack-objects";
 150         if (!shallow_nr) {
 151                 argv[arg++] = "--revs";
 152                 if (create_full_pack)
 153                         argv[arg++] = "--all";
 154                 else if (use_thin_pack)
 155                         argv[arg++] = "--thin";
 156         }
 157
 158         argv[arg++] = "--stdout";
 159         if (!no_progress)
 160                 argv[arg++] = "--progress";
 161         if (use_ofs_delta)
 162                 argv[arg++] = "--delta-base-offset";
 163         if (use_include_tag)
 164                 argv[arg++] = "--include-tag";
 165         argv[arg++] = NULL;
 166
 167         memset(&pack_objects, 0, sizeof(pack_objects));
 168         pack_objects.in = -1;
 169         pack_objects.out = -1;
 170         pack_objects.err = -1;
 171         pack_objects.git_cmd = 1;
 172         pack_objects.argv = argv;
 173
 174         if (start_command(&pack_objects))
 175                 die("git upload-pack: unable to fork git-pack-objects");
 176
 177         if (shallow_nr) {
 178                 memset(&rev_list, 0, sizeof(rev_list));
 179                 rev_list.proc = do_rev_list;
 180                 rev_list.out = pack_objects.in;
 181                 if (start_async(&rev_list))
 182                         die("git upload-pack: unable to fork git-rev-list");
 183         }
 184         else {
 185                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
 186                 if (!create_full_pack) {
 187                         int i;
 188                         for (i = 0; i < want_obj.nr; i++)
 189                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(want_obj.objects[i].item->sha1));
 190                         fprintf(pipe_fd, "--not\n");
 191                         for (i = 0; i < have_obj.nr; i++)
 192                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(have_obj.objects[i].item->sha1));
 193                 }
 194
 195                 fprintf(pipe_fd, "\n");
 196                 fflush(pipe_fd);
 197                 fclose(pipe_fd);
 198         }
 199
 200
 201         /* We read from pack_objects.err to capture stderr output for
 202          * progress bar, and pack_objects.out to capture the pack data.
 203          */
 204
 205         while (1) {
 206                 struct pollfd pfd[2];
 207                 int pe, pu, pollsize;
 208
 209                 reset_timeout();
 210
 211                 pollsize = 0;
 212                 pe = pu = -1;
 213
 214                 if (0 <= pack_objects.out) {
 215                         pfd[pollsize].fd = pack_objects.out;
 216                         pfd[pollsize].events = POLLIN;
 217                         pu = pollsize;
 218                         pollsize++;
 219                 }
 220                 if (0 <= pack_objects.err) {
 221                         pfd[pollsize].fd = pack_objects.err;
 222                         pfd[pollsize].events = POLLIN;
 223                         pe = pollsize;
 224                         pollsize++;
 225                 }
 226
 227                 if (!pollsize)
 228                         break;
 229
 230                 if (poll(pfd, pollsize, -1) < 0) {
 231                         if (errno != EINTR) {
 232                                 error("poll failed, resuming: %s",
 233                                       strerror(errno));
 234                                 sleep(1);
 235                         }
 236                         continue;
 237                 }
 238                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 239                         /* Status ready; we ship that in the side-band
 240                          * or dump to the standard error.
 241                          */
 242                         sz = xread(pack_objects.err, progress,
 243                                   sizeof(progress));
 244                         if (0 < sz)
 245                                 send_client_data(2, progress, sz);
 246                         else if (sz == 0) {
 247                                 close(pack_objects.err);
 248                                 pack_objects.err = -1;
 249                         }
 250                         else
 251                                 goto fail;
 252                         /* give priority to status messages */
 253                         continue;
 254                 }
 255                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 256                         /* Data ready; we keep the last byte to ourselves
 257                          * in case we detect broken rev-list, so that we
 258                          * can leave the stream corrupted.  This is
 259                          * unfortunate -- unpack-objects would happily
 260                          * accept a valid packdata with trailing garbage,
 261                          * so appending garbage after we pass all the
 262                          * pack data is not good enough to signal
 263                          * breakage to downstream.
 264                          */
 265                         char *cp = data;
 266                         ssize_t outsz = 0;
 267                         if (0 <= buffered) {
 268                                 *cp++ = buffered;
 269                                 outsz++;
 270                         }
 271                         sz = xread(pack_objects.out, cp,
 272                                   sizeof(data) - outsz);
 273                         if (0 < sz)
 274                                 ;
 275                         else if (sz == 0) {
 276                                 close(pack_objects.out);
 277                                 pack_objects.out = -1;
 278                         }
 279                         else
 280                                 goto fail;
 281                         sz += outsz;
 282                         if (1 < sz) {
 283                                 buffered = data[sz-1] & 0xFF;
 284                                 sz--;
 285                         }
 286                         else
 287                                 buffered = -1;
 288                         sz = send_client_data(1, data, sz);
 289                         if (sz < 0)
 290                                 goto fail;
 291                 }
 292         }
 293
 294         if (finish_command(&pack_objects)) {
 295                 error("git upload-pack: git-pack-objects died with error.");
 296                 goto fail;
 297         }
 298         if (shallow_nr && finish_async(&rev_list))
 299                 goto fail;      /* error was already reported */
 300
 301         /* flush the data */
 302         if (0 <= buffered) {
 303                 data[0] = buffered;
 304                 sz = send_client_data(1, data, 1);
 305                 if (sz < 0)
 306                         goto fail;
 307                 fprintf(stderr, "flushed.\n");
 308         }
 309         if (use_sideband)
 310                 packet_flush(1);
 311         return;
 312
 313  fail:
 314         send_client_data(3, abort_msg, sizeof(abort_msg));
 315         die("git upload-pack: %s", abort_msg);
 316 }
 317
 318 static int got_sha1(char *hex, unsigned char *sha1)
 319 {
 320         struct object *o;
 321         int we_knew_they_have = 0;
 322
 323         if (get_sha1_hex(hex, sha1))
 324                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 325         if (!has_sha1_file(sha1))
 326                 return -1;
 327
 328         o = lookup_object(sha1);
 329         if (!(o && o->parsed))
 330                 o = parse_object(sha1);
 331         if (!o)
 332                 die("oops (%s)", sha1_to_hex(sha1));
 333         if (o->type == OBJ_COMMIT) {
 334                 struct commit_list *parents;
 335                 struct commit *commit = (struct commit *)o;
 336                 if (o->flags & THEY_HAVE)
 337                         we_knew_they_have = 1;
 338                 else
 339                         o->flags |= THEY_HAVE;
 340                 if (!oldest_have || (commit->date < oldest_have))
 341                         oldest_have = commit->date;
 342                 for (parents = commit->parents;
 343                      parents;
 344                      parents = parents->next)
 345                         parents->item->object.flags |= THEY_HAVE;
 346         }
 347         if (!we_knew_they_have) {
 348                 add_object_array(o, NULL, &have_obj);
 349                 return 1;
 350         }
 351         return 0;
 352 }
 353
 354 static int reachable(struct commit *want)
 355 {
 356         struct commit_list *work = NULL;
 357
 358         commit_list_insert_by_date(want, &work);
 359         while (work) {
 360                 struct commit_list *list = work->next;
 361                 struct commit *commit = work->item;
 362                 free(work);
 363                 work = list;
 364
 365                 if (commit->object.flags & THEY_HAVE) {
 366                         want->object.flags |= COMMON_KNOWN;
 367                         break;
 368                 }
 369                 if (!commit->object.parsed)
 370                         parse_object(commit->object.sha1);
 371                 if (commit->object.flags & REACHABLE)
 372                         continue;
 373                 commit->object.flags |= REACHABLE;
 374                 if (commit->date < oldest_have)
 375                         continue;
 376                 for (list = commit->parents; list; list = list->next) {
 377                         struct commit *parent = list->item;
 378                         if (!(parent->object.flags & REACHABLE))
 379                                 commit_list_insert_by_date(parent, &work);
 380                 }
 381         }
 382         want->object.flags |= REACHABLE;
 383         clear_commit_marks(want, REACHABLE);
 384         free_commit_list(work);
 385         return (want->object.flags & COMMON_KNOWN);
 386 }
 387
 388 static int ok_to_give_up(void)
 389 {
 390         int i;
 391
 392         if (!have_obj.nr)
 393                 return 0;
 394
 395         for (i = 0; i < want_obj.nr; i++) {
 396                 struct object *want = want_obj.objects[i].item;
 397
 398                 if (want->flags & COMMON_KNOWN)
 399                         continue;
 400                 want = deref_tag(want, "a want line", 0);
 401                 if (!want || want->type != OBJ_COMMIT) {
 402                         /* no way to tell if this is reachable by
 403                          * looking at the ancestry chain alone, so
 404                          * leave a note to ourselves not to worry about
 405                          * this object anymore.
 406                          */
 407                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 408                         continue;
 409                 }
 410                 if (!reachable((struct commit *)want))
 411                         return 0;
 412         }
 413         return 1;
 414 }
 415
 416 static int get_common_commits(void)
 417 {
 418         static char line[1000];
 419         unsigned char sha1[20];
 420         char last_hex[41];
 421         int got_common = 0;
 422         int got_other = 0;
 423         int sent_ready = 0;
 424
 425         save_commit_buffer = 0;
 426
 427         for (;;) {
 428                 int len = packet_read_line(0, line, sizeof(line));
 429                 reset_timeout();
 430
 431                 if (!len) {
 432                         if (multi_ack == 2 && got_common
 433                             && !got_other && ok_to_give_up()) {
 434                                 sent_ready = 1;
 435                                 packet_write(1, "ACK %s ready\n", last_hex);
 436                         }
 437                         if (have_obj.nr == 0 || multi_ack)
 438                                 packet_write(1, "NAK\n");
 439
 440                         if (no_done && sent_ready) {
 441                                 packet_write(1, "ACK %s\n", last_hex);
 442                                 return 0;
 443                         }
 444                         if (stateless_rpc)
 445                                 exit(0);
 446                         got_common = 0;
 447                         got_other = 0;
 448                         continue;
 449                 }
 450                 strip(line, len);
 451                 if (!prefixcmp(line, "have ")) {
 452                         switch (got_sha1(line+5, sha1)) {
 453                         case -1: /* they have what we do not */
 454                                 got_other = 1;
 455                                 if (multi_ack && ok_to_give_up()) {
 456                                         const char *hex = sha1_to_hex(sha1);
 457                                         if (multi_ack == 2) {
 458                                                 sent_ready = 1;
 459                                                 packet_write(1, "ACK %s ready\n", hex);
 460                                         } else
 461                                                 packet_write(1, "ACK %s continue\n", hex);
 462                                 }
 463                                 break;
 464                         default:
 465                                 got_common = 1;
 466                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 467                                 if (multi_ack == 2)
 468                                         packet_write(1, "ACK %s common\n", last_hex);
 469                                 else if (multi_ack)
 470                                         packet_write(1, "ACK %s continue\n", last_hex);
 471                                 else if (have_obj.nr == 1)
 472                                         packet_write(1, "ACK %s\n", last_hex);
 473                                 break;
 474                         }
 475                         continue;
 476                 }
 477                 if (!strcmp(line, "done")) {
 478                         if (have_obj.nr > 0) {
 479                                 if (multi_ack)
 480                                         packet_write(1, "ACK %s\n", last_hex);
 481                                 return 0;
 482                         }
 483                         packet_write(1, "NAK\n");
 484                         return -1;
 485                 }
 486                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 487         }
 488 }
 489
 490 static void receive_needs(void)
 491 {
 492         struct object_array shallows = OBJECT_ARRAY_INIT;
 493         static char line[1000];
 494         int len, depth = 0;
 495
 496         shallow_nr = 0;
 497         if (debug_fd)
 498                 write_str_in_full(debug_fd, "#S\n");
 499         for (;;) {
 500                 struct object *o;
 501                 unsigned char sha1_buf[20];
 502                 len = packet_read_line(0, line, sizeof(line));
 503                 reset_timeout();
 504                 if (!len)
 505                         break;
 506                 if (debug_fd)
 507                         write_in_full(debug_fd, line, len);
 508
 509                 if (!prefixcmp(line, "shallow ")) {
 510                         unsigned char sha1[20];
 511                         struct object *object;
 512                         if (get_sha1(line + 8, sha1))
 513                                 die("invalid shallow line: %s", line);
 514                         object = parse_object(sha1);
 515                         if (!object)
 516                                 die("did not find object for %s", line);
 517                         object->flags |= CLIENT_SHALLOW;
 518                         add_object_array(object, NULL, &shallows);
 519                         continue;
 520                 }
 521                 if (!prefixcmp(line, "deepen ")) {
 522                         char *end;
 523                         depth = strtol(line + 7, &end, 0);
 524                         if (end == line + 7 || depth <= 0)
 525                                 die("Invalid deepen: %s", line);
 526                         continue;
 527                 }
 528                 if (prefixcmp(line, "want ") ||
 529                     get_sha1_hex(line+5, sha1_buf))
 530                         die("git upload-pack: protocol error, "
 531                             "expected to get sha, not '%s'", line);
 532                 if (strstr(line+45, "multi_ack_detailed"))
 533                         multi_ack = 2;
 534                 else if (strstr(line+45, "multi_ack"))
 535                         multi_ack = 1;
 536                 if (strstr(line+45, "no-done"))
 537                         no_done = 1;
 538                 if (strstr(line+45, "thin-pack"))
 539                         use_thin_pack = 1;
 540                 if (strstr(line+45, "ofs-delta"))
 541                         use_ofs_delta = 1;
 542                 if (strstr(line+45, "side-band-64k"))
 543                         use_sideband = LARGE_PACKET_MAX;
 544                 else if (strstr(line+45, "side-band"))
 545                         use_sideband = DEFAULT_PACKET_MAX;
 546                 if (strstr(line+45, "no-progress"))
 547                         no_progress = 1;
 548                 if (strstr(line+45, "include-tag"))
 549                         use_include_tag = 1;
 550
 551                 /* We have sent all our refs already, and the other end
 552                  * should have chosen out of them; otherwise they are
 553                  * asking for nonsense.
 554                  *
 555                  * Hmph.  We may later want to allow "want" line that
 556                  * asks for something like "master~10" (symbolic)...
 557                  * would it make sense?  I don't know.
 558                  */
 559                 o = lookup_object(sha1_buf);
 560                 if (!o || !(o->flags & OUR_REF))
 561                         die("git upload-pack: not our ref %s",
 562                             sha1_to_hex(sha1_buf));
 563                 if (!(o->flags & WANTED)) {
 564                         o->flags |= WANTED;
 565                         add_object_array(o, NULL, &want_obj);
 566                 }
 567         }
 568         if (debug_fd)
 569                 write_str_in_full(debug_fd, "#E\n");
 570
 571         if (!use_sideband && daemon_mode)
 572                 no_progress = 1;
 573
 574         if (depth == 0 && shallows.nr == 0)
 575                 return;
 576         if (depth > 0) {
 577                 struct commit_list *result, *backup;
 578                 int i;
 579                 backup = result = get_shallow_commits(&want_obj, depth,
 580                         SHALLOW, NOT_SHALLOW);
 581                 while (result) {
 582                         struct object *object = &result->item->object;
 583                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 584                                 packet_write(1, "shallow %s",
 585                                                 sha1_to_hex(object->sha1));
 586                                 register_shallow(object->sha1);
 587                                 shallow_nr++;
 588                         }
 589                         result = result->next;
 590                 }
 591                 free_commit_list(backup);
 592                 for (i = 0; i < shallows.nr; i++) {
 593                         struct object *object = shallows.objects[i].item;
 594                         if (object->flags & NOT_SHALLOW) {
 595                                 struct commit_list *parents;
 596                                 packet_write(1, "unshallow %s",
 597                                         sha1_to_hex(object->sha1));
 598                                 object->flags &= ~CLIENT_SHALLOW;
 599                                 /* make sure the real parents are parsed */
 600                                 unregister_shallow(object->sha1);
 601                                 object->parsed = 0;
 602                                 if (parse_commit((struct commit *)object))
 603                                         die("invalid commit");
 604                                 parents = ((struct commit *)object)->parents;
 605                                 while (parents) {
 606                                         add_object_array(&parents->item->object,
 607                                                         NULL, &want_obj);
 608                                         parents = parents->next;
 609                                 }
 610                                 add_object_array(object, NULL, &extra_edge_obj);
 611                         }
 612                         /* make sure commit traversal conforms to client */
 613                         register_shallow(object->sha1);
 614                 }
 615                 packet_flush(1);
 616         } else
 617                 if (shallows.nr > 0) {
 618                         int i;
 619                         for (i = 0; i < shallows.nr; i++)
 620                                 register_shallow(shallows.objects[i].item->sha1);
 621                 }
 622
 623         shallow_nr += shallows.nr;
 624         free(shallows.objects);
 625 }
 626
 627 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 628 {
 629         static const char *capabilities = "multi_ack thin-pack side-band"
 630                 " side-band-64k ofs-delta shallow no-progress"
 631                 " include-tag multi_ack_detailed";
 632         struct object *o = parse_object(sha1);
 633
 634         if (!o)
 635                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 636
 637         if (capabilities)
 638                 packet_write(1, "%s %s%c%s%s\n", sha1_to_hex(sha1), refname,
 639                              0, capabilities,
 640                              stateless_rpc ? " no-done" : "");
 641         else
 642                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
 643         capabilities = NULL;
 644         if (!(o->flags & OUR_REF)) {
 645                 o->flags |= OUR_REF;
 646                 nr_our_refs++;
 647         }
 648         if (o->type == OBJ_TAG) {
 649                 o = deref_tag(o, refname, 0);
 650                 if (o)
 651                         packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
 652         }
 653         return 0;
 654 }
 655
 656 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 657 {
 658         struct object *o = parse_object(sha1);
 659         if (!o)
 660                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 661         if (!(o->flags & OUR_REF)) {
 662                 o->flags |= OUR_REF;
 663                 nr_our_refs++;
 664         }
 665         return 0;
 666 }
 667
 668 static void upload_pack(void)
 669 {
 670         if (advertise_refs || !stateless_rpc) {
 671                 reset_timeout();
 672                 head_ref(send_ref, NULL);
 673                 for_each_ref(send_ref, NULL);
 674                 packet_flush(1);
 675         } else {
 676                 head_ref(mark_our_ref, NULL);
 677                 for_each_ref(mark_our_ref, NULL);
 678         }
 679         if (advertise_refs)
 680                 return;
 681
 682         receive_needs();
 683         if (want_obj.nr) {
 684                 get_common_commits();
 685                 create_pack_file();
 686         }
 687 }
 688
 689 int main(int argc, char **argv)
 690 {
 691         char *dir;
 692         int i;
 693         int strict = 0;
 694
 695         packet_trace_identity("upload-pack");
 696         git_extract_argv0_path(argv[0]);
 697         read_replace_refs = 0;
 698
 699         for (i = 1; i < argc; i++) {
 700                 char *arg = argv[i];
 701
 702                 if (arg[0] != '-')
 703                         break;
 704                 if (!strcmp(arg, "--advertise-refs")) {
 705                         advertise_refs = 1;
 706                         continue;
 707                 }
 708                 if (!strcmp(arg, "--stateless-rpc")) {
 709                         stateless_rpc = 1;
 710                         continue;
 711                 }
 712                 if (!strcmp(arg, "--strict")) {
 713                         strict = 1;
 714                         continue;
 715                 }
 716                 if (!prefixcmp(arg, "--timeout=")) {
 717                         timeout = atoi(arg+10);
 718                         daemon_mode = 1;
 719                         continue;
 720                 }
 721                 if (!strcmp(arg, "--")) {
 722                         i++;
 723                         break;
 724                 }
 725         }
 726
 727         if (i != argc-1)
 728                 usage(upload_pack_usage);
 729
 730         setup_path();
 731
 732         dir = argv[i];
 733
 734         if (!enter_repo(dir, strict))
 735                 die("'%s' does not appear to be a git repository", dir);
 736         if (is_repository_shallow())
 737                 die("attempt to fetch/clone from a shallow repository");
 738         if (getenv("GIT_DEBUG_SEND_PACK"))
 739                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
 740         upload_pack();
 741         return 0;
 742 }