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 use_thin_pack, use_ofs_delta, use_include_tag;
  31 static int no_progress, daemon_mode;
  32 static int shallow_nr;
  33 static struct object_array have_obj;
  34 static struct object_array want_obj;
  35 static struct object_array extra_edge_obj;
  36 static unsigned int timeout;
  37 /* 0 for no sideband,
  38  * otherwise maximum packet size (up to 65520 bytes).
  39  */
  40 static int use_sideband;
  41 static int debug_fd;
  42 static int advertise_refs;
  43 static int stateless_rpc;
  44
  45 static void reset_timeout(void)
  46 {
  47         alarm(timeout);
  48 }
  49
  50 static int strip(char *line, int len)
  51 {
  52         if (len && line[len-1] == '\n')
  53                 line[--len] = 0;
  54         return len;
  55 }
  56
  57 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  58 {
  59         if (use_sideband)
  60                 return send_sideband(1, fd, data, sz, use_sideband);
  61         if (fd == 3)
  62                 /* emergency quit */
  63                 fd = 2;
  64         if (fd == 2) {
  65                 /* XXX: are we happy to lose stuff here? */
  66                 xwrite(fd, data, sz);
  67                 return sz;
  68         }
  69         return safe_write(fd, data, sz);
  70 }
  71
  72 static FILE *pack_pipe = NULL;
  73 static void show_commit(struct commit *commit, void *data)
  74 {
  75         if (commit->object.flags & BOUNDARY)
  76                 fputc('-', pack_pipe);
  77         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
  78                 die("broken output pipe");
  79         fputc('\n', pack_pipe);
  80         fflush(pack_pipe);
  81         free(commit->buffer);
  82         commit->buffer = NULL;
  83 }
  84
  85 static void show_object(struct object *obj, const struct name_path *path, const char *component)
  86 {
  87         /* An object with name "foo\n0000000..." can be used to
  88          * confuse downstream git-pack-objects very badly.
  89          */
  90         const char *name = path_name(path, component);
  91         const char *ep = strchr(name, '\n');
  92         if (ep) {
  93                 fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(obj->sha1),
  94                        (int) (ep - name),
  95                        name);
  96         }
  97         else
  98                 fprintf(pack_pipe, "%s %s\n",
  99                                 sha1_to_hex(obj->sha1), name);
 100         free((char *)name);
 101 }
 102
 103 static void show_edge(struct commit *commit)
 104 {
 105         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
 106 }
 107
 108 static int do_rev_list(int in, int out, void *user_data)
 109 {
 110         int i;
 111         struct rev_info revs;
 112
 113         pack_pipe = xfdopen(out, "w");
 114         init_revisions(&revs, NULL);
 115         revs.tag_objects = 1;
 116         revs.tree_objects = 1;
 117         revs.blob_objects = 1;
 118         if (use_thin_pack)
 119                 revs.edge_hint = 1;
 120
 121         for (i = 0; i < want_obj.nr; i++) {
 122                 struct object *o = want_obj.objects[i].item;
 123                 /* why??? */
 124                 o->flags &= ~UNINTERESTING;
 125                 add_pending_object(&revs, o, NULL);
 126         }
 127         for (i = 0; i < have_obj.nr; i++) {
 128                 struct object *o = have_obj.objects[i].item;
 129                 o->flags |= UNINTERESTING;
 130                 add_pending_object(&revs, o, NULL);
 131         }
 132         setup_revisions(0, NULL, &revs, NULL);
 133         if (prepare_revision_walk(&revs))
 134                 die("revision walk setup failed");
 135         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 136         if (use_thin_pack)
 137                 for (i = 0; i < extra_edge_obj.nr; i++)
 138                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
 139                                         extra_edge_obj.objects[i].item->sha1));
 140         traverse_commit_list(&revs, show_commit, show_object, NULL);
 141         fflush(pack_pipe);
 142         fclose(pack_pipe);
 143         return 0;
 144 }
 145
 146 static void create_pack_file(void)
 147 {
 148         struct async rev_list;
 149         struct child_process pack_objects;
 150         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
 151         char data[8193], progress[128];
 152         char abort_msg[] = "aborting due to possible repository "
 153                 "corruption on the remote side.";
 154         int buffered = -1;
 155         ssize_t sz;
 156         const char *argv[10];
 157         int arg = 0;
 158
 159         if (shallow_nr) {
 160                 memset(&rev_list, 0, sizeof(rev_list));
 161                 rev_list.proc = do_rev_list;
 162                 rev_list.out = -1;
 163                 if (start_async(&rev_list))
 164                         die("git upload-pack: unable to fork git-rev-list");
 165                 argv[arg++] = "pack-objects";
 166         } else {
 167                 argv[arg++] = "pack-objects";
 168                 argv[arg++] = "--revs";
 169                 if (create_full_pack)
 170                         argv[arg++] = "--all";
 171                 else if (use_thin_pack)
 172                         argv[arg++] = "--thin";
 173         }
 174
 175         argv[arg++] = "--stdout";
 176         if (!no_progress)
 177                 argv[arg++] = "--progress";
 178         if (use_ofs_delta)
 179                 argv[arg++] = "--delta-base-offset";
 180         if (use_include_tag)
 181                 argv[arg++] = "--include-tag";
 182         argv[arg++] = NULL;
 183
 184         memset(&pack_objects, 0, sizeof(pack_objects));
 185         pack_objects.in = shallow_nr ? rev_list.out : -1;
 186         pack_objects.out = -1;
 187         pack_objects.err = -1;
 188         pack_objects.git_cmd = 1;
 189         pack_objects.argv = argv;
 190
 191         if (start_command(&pack_objects))
 192                 die("git upload-pack: unable to fork git-pack-objects");
 193
 194         /* pass on revisions we (don't) want */
 195         if (!shallow_nr) {
 196                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
 197                 if (!create_full_pack) {
 198                         int i;
 199                         for (i = 0; i < want_obj.nr; i++)
 200                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(want_obj.objects[i].item->sha1));
 201                         fprintf(pipe_fd, "--not\n");
 202                         for (i = 0; i < have_obj.nr; i++)
 203                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(have_obj.objects[i].item->sha1));
 204                 }
 205
 206                 fprintf(pipe_fd, "\n");
 207                 fflush(pipe_fd);
 208                 fclose(pipe_fd);
 209         }
 210
 211
 212         /* We read from pack_objects.err to capture stderr output for
 213          * progress bar, and pack_objects.out to capture the pack data.
 214          */
 215
 216         while (1) {
 217                 struct pollfd pfd[2];
 218                 int pe, pu, pollsize;
 219
 220                 reset_timeout();
 221
 222                 pollsize = 0;
 223                 pe = pu = -1;
 224
 225                 if (0 <= pack_objects.out) {
 226                         pfd[pollsize].fd = pack_objects.out;
 227                         pfd[pollsize].events = POLLIN;
 228                         pu = pollsize;
 229                         pollsize++;
 230                 }
 231                 if (0 <= pack_objects.err) {
 232                         pfd[pollsize].fd = pack_objects.err;
 233                         pfd[pollsize].events = POLLIN;
 234                         pe = pollsize;
 235                         pollsize++;
 236                 }
 237
 238                 if (!pollsize)
 239                         break;
 240
 241                 if (poll(pfd, pollsize, -1) < 0) {
 242                         if (errno != EINTR) {
 243                                 error("poll failed, resuming: %s",
 244                                       strerror(errno));
 245                                 sleep(1);
 246                         }
 247                         continue;
 248                 }
 249                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 250                         /* Status ready; we ship that in the side-band
 251                          * or dump to the standard error.
 252                          */
 253                         sz = xread(pack_objects.err, progress,
 254                                   sizeof(progress));
 255                         if (0 < sz)
 256                                 send_client_data(2, progress, sz);
 257                         else if (sz == 0) {
 258                                 close(pack_objects.err);
 259                                 pack_objects.err = -1;
 260                         }
 261                         else
 262                                 goto fail;
 263                         /* give priority to status messages */
 264                         continue;
 265                 }
 266                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 267                         /* Data ready; we keep the last byte to ourselves
 268                          * in case we detect broken rev-list, so that we
 269                          * can leave the stream corrupted.  This is
 270                          * unfortunate -- unpack-objects would happily
 271                          * accept a valid packdata with trailing garbage,
 272                          * so appending garbage after we pass all the
 273                          * pack data is not good enough to signal
 274                          * breakage to downstream.
 275                          */
 276                         char *cp = data;
 277                         ssize_t outsz = 0;
 278                         if (0 <= buffered) {
 279                                 *cp++ = buffered;
 280                                 outsz++;
 281                         }
 282                         sz = xread(pack_objects.out, cp,
 283                                   sizeof(data) - outsz);
 284                         if (0 < sz)
 285                                 ;
 286                         else if (sz == 0) {
 287                                 close(pack_objects.out);
 288                                 pack_objects.out = -1;
 289                         }
 290                         else
 291                                 goto fail;
 292                         sz += outsz;
 293                         if (1 < sz) {
 294                                 buffered = data[sz-1] & 0xFF;
 295                                 sz--;
 296                         }
 297                         else
 298                                 buffered = -1;
 299                         sz = send_client_data(1, data, sz);
 300                         if (sz < 0)
 301                                 goto fail;
 302                 }
 303         }
 304
 305         if (finish_command(&pack_objects)) {
 306                 error("git upload-pack: git-pack-objects died with error.");
 307                 goto fail;
 308         }
 309         if (shallow_nr && finish_async(&rev_list))
 310                 goto fail;      /* error was already reported */
 311
 312         /* flush the data */
 313         if (0 <= buffered) {
 314                 data[0] = buffered;
 315                 sz = send_client_data(1, data, 1);
 316                 if (sz < 0)
 317                         goto fail;
 318                 fprintf(stderr, "flushed.\n");
 319         }
 320         if (use_sideband)
 321                 packet_flush(1);
 322         return;
 323
 324  fail:
 325         send_client_data(3, abort_msg, sizeof(abort_msg));
 326         die("git upload-pack: %s", abort_msg);
 327 }
 328
 329 static int got_sha1(char *hex, unsigned char *sha1)
 330 {
 331         struct object *o;
 332         int we_knew_they_have = 0;
 333
 334         if (get_sha1_hex(hex, sha1))
 335                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 336         if (!has_sha1_file(sha1))
 337                 return -1;
 338
 339         o = lookup_object(sha1);
 340         if (!(o && o->parsed))
 341                 o = parse_object(sha1);
 342         if (!o)
 343                 die("oops (%s)", sha1_to_hex(sha1));
 344         if (o->type == OBJ_COMMIT) {
 345                 struct commit_list *parents;
 346                 struct commit *commit = (struct commit *)o;
 347                 if (o->flags & THEY_HAVE)
 348                         we_knew_they_have = 1;
 349                 else
 350                         o->flags |= THEY_HAVE;
 351                 if (!oldest_have || (commit->date < oldest_have))
 352                         oldest_have = commit->date;
 353                 for (parents = commit->parents;
 354                      parents;
 355                      parents = parents->next)
 356                         parents->item->object.flags |= THEY_HAVE;
 357         }
 358         if (!we_knew_they_have) {
 359                 add_object_array(o, NULL, &have_obj);
 360                 return 1;
 361         }
 362         return 0;
 363 }
 364
 365 static int reachable(struct commit *want)
 366 {
 367         struct commit_list *work = NULL;
 368
 369         commit_list_insert_by_date(want, &work);
 370         while (work) {
 371                 struct commit_list *list = work->next;
 372                 struct commit *commit = work->item;
 373                 free(work);
 374                 work = list;
 375
 376                 if (commit->object.flags & THEY_HAVE) {
 377                         want->object.flags |= COMMON_KNOWN;
 378                         break;
 379                 }
 380                 if (!commit->object.parsed)
 381                         parse_object(commit->object.sha1);
 382                 if (commit->object.flags & REACHABLE)
 383                         continue;
 384                 commit->object.flags |= REACHABLE;
 385                 if (commit->date < oldest_have)
 386                         continue;
 387                 for (list = commit->parents; list; list = list->next) {
 388                         struct commit *parent = list->item;
 389                         if (!(parent->object.flags & REACHABLE))
 390                                 commit_list_insert_by_date(parent, &work);
 391                 }
 392         }
 393         want->object.flags |= REACHABLE;
 394         clear_commit_marks(want, REACHABLE);
 395         free_commit_list(work);
 396         return (want->object.flags & COMMON_KNOWN);
 397 }
 398
 399 static int ok_to_give_up(void)
 400 {
 401         int i;
 402
 403         if (!have_obj.nr)
 404                 return 0;
 405
 406         for (i = 0; i < want_obj.nr; i++) {
 407                 struct object *want = want_obj.objects[i].item;
 408
 409                 if (want->flags & COMMON_KNOWN)
 410                         continue;
 411                 want = deref_tag(want, "a want line", 0);
 412                 if (!want || want->type != OBJ_COMMIT) {
 413                         /* no way to tell if this is reachable by
 414                          * looking at the ancestry chain alone, so
 415                          * leave a note to ourselves not to worry about
 416                          * this object anymore.
 417                          */
 418                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 419                         continue;
 420                 }
 421                 if (!reachable((struct commit *)want))
 422                         return 0;
 423         }
 424         return 1;
 425 }
 426
 427 static int get_common_commits(void)
 428 {
 429         static char line[1000];
 430         unsigned char sha1[20];
 431         char last_hex[41];
 432         int got_common = 0;
 433         int got_other = 0;
 434
 435         save_commit_buffer = 0;
 436
 437         for (;;) {
 438                 int len = packet_read_line(0, line, sizeof(line));
 439                 reset_timeout();
 440
 441                 if (!len) {
 442                         if (multi_ack == 2 && got_common
 443                             && !got_other && ok_to_give_up())
 444                                 packet_write(1, "ACK %s ready\n", last_hex);
 445                         if (have_obj.nr == 0 || multi_ack)
 446                                 packet_write(1, "NAK\n");
 447                         if (stateless_rpc)
 448                                 exit(0);
 449                         got_common = 0;
 450                         got_other = 0;
 451                         continue;
 452                 }
 453                 strip(line, len);
 454                 if (!prefixcmp(line, "have ")) {
 455                         switch (got_sha1(line+5, sha1)) {
 456                         case -1: /* they have what we do not */
 457                                 got_other = 1;
 458                                 if (multi_ack && ok_to_give_up()) {
 459                                         const char *hex = sha1_to_hex(sha1);
 460                                         if (multi_ack == 2)
 461                                                 packet_write(1, "ACK %s ready\n", hex);
 462                                         else
 463                                                 packet_write(1, "ACK %s continue\n", hex);
 464                                 }
 465                                 break;
 466                         default:
 467                                 got_common = 1;
 468                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 469                                 if (multi_ack == 2)
 470                                         packet_write(1, "ACK %s common\n", last_hex);
 471                                 else if (multi_ack)
 472                                         packet_write(1, "ACK %s continue\n", last_hex);
 473                                 else if (have_obj.nr == 1)
 474                                         packet_write(1, "ACK %s\n", last_hex);
 475                                 break;
 476                         }
 477                         continue;
 478                 }
 479                 if (!strcmp(line, "done")) {
 480                         if (have_obj.nr > 0) {
 481                                 if (multi_ack)
 482                                         packet_write(1, "ACK %s\n", last_hex);
 483                                 return 0;
 484                         }
 485                         packet_write(1, "NAK\n");
 486                         return -1;
 487                 }
 488                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 489         }
 490 }
 491
 492 static void receive_needs(void)
 493 {
 494         struct object_array shallows = OBJECT_ARRAY_INIT;
 495         static char line[1000];
 496         int len, depth = 0;
 497
 498         shallow_nr = 0;
 499         if (debug_fd)
 500                 write_str_in_full(debug_fd, "#S\n");
 501         for (;;) {
 502                 struct object *o;
 503                 unsigned char sha1_buf[20];
 504                 len = packet_read_line(0, line, sizeof(line));
 505                 reset_timeout();
 506                 if (!len)
 507                         break;
 508                 if (debug_fd)
 509                         write_in_full(debug_fd, line, len);
 510
 511                 if (!prefixcmp(line, "shallow ")) {
 512                         unsigned char sha1[20];
 513                         struct object *object;
 514                         if (get_sha1(line + 8, sha1))
 515                                 die("invalid shallow line: %s", line);
 516                         object = parse_object(sha1);
 517                         if (!object)
 518                                 die("did not find object for %s", line);
 519                         object->flags |= CLIENT_SHALLOW;
 520                         add_object_array(object, NULL, &shallows);
 521                         continue;
 522                 }
 523                 if (!prefixcmp(line, "deepen ")) {
 524                         char *end;
 525                         depth = strtol(line + 7, &end, 0);
 526                         if (end == line + 7 || depth <= 0)
 527                                 die("Invalid deepen: %s", line);
 528                         continue;
 529                 }
 530                 if (prefixcmp(line, "want ") ||
 531                     get_sha1_hex(line+5, sha1_buf))
 532                         die("git upload-pack: protocol error, "
 533                             "expected to get sha, not '%s'", line);
 534                 if (strstr(line+45, "multi_ack_detailed"))
 535                         multi_ack = 2;
 536                 else if (strstr(line+45, "multi_ack"))
 537                         multi_ack = 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\n", sha1_to_hex(sha1), refname,
 639                         0, capabilities);
 640         else
 641                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
 642         capabilities = NULL;
 643         if (!(o->flags & OUR_REF)) {
 644                 o->flags |= OUR_REF;
 645                 nr_our_refs++;
 646         }
 647         if (o->type == OBJ_TAG) {
 648                 o = deref_tag(o, refname, 0);
 649                 if (o)
 650                         packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
 651         }
 652         return 0;
 653 }
 654
 655 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 656 {
 657         struct object *o = parse_object(sha1);
 658         if (!o)
 659                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 660         if (!(o->flags & OUR_REF)) {
 661                 o->flags |= OUR_REF;
 662                 nr_our_refs++;
 663         }
 664         return 0;
 665 }
 666
 667 static void upload_pack(void)
 668 {
 669         if (advertise_refs || !stateless_rpc) {
 670                 reset_timeout();
 671                 head_ref(send_ref, NULL);
 672                 for_each_ref(send_ref, NULL);
 673                 packet_flush(1);
 674         } else {
 675                 head_ref(mark_our_ref, NULL);
 676                 for_each_ref(mark_our_ref, NULL);
 677         }
 678         if (advertise_refs)
 679                 return;
 680
 681         receive_needs();
 682         if (want_obj.nr) {
 683                 get_common_commits();
 684                 create_pack_file();
 685         }
 686 }
 687
 688 int main(int argc, char **argv)
 689 {
 690         char *dir;
 691         int i;
 692         int strict = 0;
 693
 694         packet_trace_identity("upload-pack");
 695         git_extract_argv0_path(argv[0]);
 696         read_replace_refs = 0;
 697
 698         for (i = 1; i < argc; i++) {
 699                 char *arg = argv[i];
 700
 701                 if (arg[0] != '-')
 702                         break;
 703                 if (!strcmp(arg, "--advertise-refs")) {
 704                         advertise_refs = 1;
 705                         continue;
 706                 }
 707                 if (!strcmp(arg, "--stateless-rpc")) {
 708                         stateless_rpc = 1;
 709                         continue;
 710                 }
 711                 if (!strcmp(arg, "--strict")) {
 712                         strict = 1;
 713                         continue;
 714                 }
 715                 if (!prefixcmp(arg, "--timeout=")) {
 716                         timeout = atoi(arg+10);
 717                         daemon_mode = 1;
 718                         continue;
 719                 }
 720                 if (!strcmp(arg, "--")) {
 721                         i++;
 722                         break;
 723                 }
 724         }
 725
 726         if (i != argc-1)
 727                 usage(upload_pack_usage);
 728
 729         setup_path();
 730
 731         dir = argv[i];
 732
 733         if (!enter_repo(dir, strict))
 734                 die("'%s' does not appear to be a git repository", dir);
 735         if (is_repository_shallow())
 736                 die("attempt to fetch/clone from a shallow repository");
 737         if (getenv("GIT_DEBUG_SEND_PACK"))
 738                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
 739         upload_pack();
 740         return 0;
 741 }