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=nn] <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, no_progress;
  31 static struct object_array have_obj;
  32 static struct object_array want_obj;
  33 static unsigned int timeout;
  34 /* 0 for no sideband,
  35  * otherwise maximum packet size (up to 65520 bytes).
  36  */
  37 static int use_sideband;
  38
  39 static void reset_timeout(void)
  40 {
  41         alarm(timeout);
  42 }
  43
  44 static int strip(char *line, int len)
  45 {
  46         if (len && line[len-1] == '\n')
  47                 line[--len] = 0;
  48         return len;
  49 }
  50
  51 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  52 {
  53         if (use_sideband)
  54                 return send_sideband(1, fd, data, sz, use_sideband);
  55         if (fd == 3)
  56                 /* emergency quit */
  57                 fd = 2;
  58         if (fd == 2) {
  59                 /* XXX: are we happy to lose stuff here? */
  60                 xwrite(fd, data, sz);
  61                 return sz;
  62         }
  63         return safe_write(fd, data, sz);
  64 }
  65
  66 static FILE *pack_pipe = NULL;
  67 static void show_commit(struct commit *commit)
  68 {
  69         if (commit->object.flags & BOUNDARY)
  70                 fputc('-', pack_pipe);
  71         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
  72                 die("broken output pipe");
  73         fputc('\n', pack_pipe);
  74         fflush(pack_pipe);
  75         free(commit->buffer);
  76         commit->buffer = NULL;
  77 }
  78
  79 static void show_object(struct object_array_entry *p)
  80 {
  81         /* An object with name "foo\n0000000..." can be used to
  82          * confuse downstream git-pack-objects very badly.
  83          */
  84         const char *ep = strchr(p->name, '\n');
  85         if (ep) {
  86                 fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(p->item->sha1),
  87                        (int) (ep - p->name),
  88                        p->name);
  89         }
  90         else
  91                 fprintf(pack_pipe, "%s %s\n",
  92                                 sha1_to_hex(p->item->sha1), p->name);
  93 }
  94
  95 static void show_edge(struct commit *commit)
  96 {
  97         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
  98 }
  99
 100 static int do_rev_list(int fd, void *create_full_pack)
 101 {
 102         int i;
 103         struct rev_info revs;
 104
 105         pack_pipe = fdopen(fd, "w");
 106         if (create_full_pack)
 107                 use_thin_pack = 0; /* no point doing it */
 108         init_revisions(&revs, NULL);
 109         revs.tag_objects = 1;
 110         revs.tree_objects = 1;
 111         revs.blob_objects = 1;
 112         if (use_thin_pack)
 113                 revs.edge_hint = 1;
 114
 115         if (create_full_pack) {
 116                 const char *args[] = {"rev-list", "--all", NULL};
 117                 setup_revisions(2, args, &revs, NULL);
 118         } else {
 119                 for (i = 0; i < want_obj.nr; i++) {
 120                         struct object *o = want_obj.objects[i].item;
 121                         /* why??? */
 122                         o->flags &= ~UNINTERESTING;
 123                         add_pending_object(&revs, o, NULL);
 124                 }
 125                 for (i = 0; i < have_obj.nr; i++) {
 126                         struct object *o = have_obj.objects[i].item;
 127                         o->flags |= UNINTERESTING;
 128                         add_pending_object(&revs, o, NULL);
 129                 }
 130                 setup_revisions(0, NULL, &revs, NULL);
 131         }
 132         prepare_revision_walk(&revs);
 133         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 134         traverse_commit_list(&revs, show_commit, show_object);
 135         fflush(pack_pipe);
 136         fclose(pack_pipe);
 137         return 0;
 138 }
 139
 140 static void create_pack_file(void)
 141 {
 142         struct async rev_list;
 143         struct child_process pack_objects;
 144         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
 145         char data[8193], progress[128];
 146         char abort_msg[] = "aborting due to possible repository "
 147                 "corruption on the remote side.";
 148         int buffered = -1;
 149         const char *argv[10];
 150         int arg = 0;
 151
 152         rev_list.proc = do_rev_list;
 153         /* .data is just a boolean: any non-NULL value will do */
 154         rev_list.data = create_full_pack ? &rev_list : NULL;
 155         if (start_async(&rev_list))
 156                 die("git-upload-pack: unable to fork git-rev-list");
 157
 158         argv[arg++] = "pack-objects";
 159         argv[arg++] = "--stdout";
 160         if (!no_progress)
 161                 argv[arg++] = "--progress";
 162         if (use_ofs_delta)
 163                 argv[arg++] = "--delta-base-offset";
 164         argv[arg++] = NULL;
 165
 166         memset(&pack_objects, 0, sizeof(pack_objects));
 167         pack_objects.in = rev_list.out; /* start_command closes it */
 168         pack_objects.out = -1;
 169         pack_objects.err = -1;
 170         pack_objects.git_cmd = 1;
 171         pack_objects.argv = argv;
 172
 173         if (start_command(&pack_objects))
 174                 die("git-upload-pack: unable to fork git-pack-objects");
 175
 176 #ifndef __MINGW32__
 177         /* We read from pack_objects.err to capture stderr output for
 178          * progress bar, and pack_objects.out to capture the pack data.
 179          */
 180
 181         while (1) {
 182                 const char *who;
 183                 struct pollfd pfd[2];
 184                 pid_t pid;
 185                 int status;
 186                 ssize_t sz;
 187                 int pe, pu, pollsize;
 188
 189                 reset_timeout();
 190
 191                 pollsize = 0;
 192                 pe = pu = -1;
 193
 194                 if (0 <= pack_objects.out) {
 195                         pfd[pollsize].fd = pack_objects.out;
 196                         pfd[pollsize].events = POLLIN;
 197                         pu = pollsize;
 198                         pollsize++;
 199                 }
 200                 if (0 <= pack_objects.err) {
 201                         pfd[pollsize].fd = pack_objects.err;
 202                         pfd[pollsize].events = POLLIN;
 203                         pe = pollsize;
 204                         pollsize++;
 205                 }
 206
 207                 if (pollsize) {
 208                         if (poll(pfd, pollsize, -1) < 0) {
 209                                 if (errno != EINTR) {
 210                                         error("poll failed, resuming: %s",
 211                                               strerror(errno));
 212                                         sleep(1);
 213                                 }
 214                                 continue;
 215                         }
 216                         if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 217                                 /* Data ready; we keep the last byte
 218                                  * to ourselves in case we detect
 219                                  * broken rev-list, so that we can
 220                                  * leave the stream corrupted.  This
 221                                  * is unfortunate -- unpack-objects
 222                                  * would happily accept a valid pack
 223                                  * data with trailing garbage, so
 224                                  * appending garbage after we pass all
 225                                  * the pack data is not good enough to
 226                                  * signal breakage to downstream.
 227                                  */
 228                                 char *cp = data;
 229                                 ssize_t outsz = 0;
 230                                 if (0 <= buffered) {
 231                                         *cp++ = buffered;
 232                                         outsz++;
 233                                 }
 234                                 sz = xread(pack_objects.out, cp,
 235                                           sizeof(data) - outsz);
 236                                 if (0 < sz)
 237                                                 ;
 238                                 else if (sz == 0) {
 239                                         close(pack_objects.out);
 240                                         pack_objects.out = -1;
 241                                 }
 242                                 else
 243                                         goto fail;
 244                                 sz += outsz;
 245                                 if (1 < sz) {
 246                                         buffered = data[sz-1] & 0xFF;
 247                                         sz--;
 248                                 }
 249                                 else
 250                                         buffered = -1;
 251                                 sz = send_client_data(1, data, sz);
 252                                 if (sz < 0)
 253                                         goto fail;
 254                         }
 255                         if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 256                                 /* Status ready; we ship that in the side-band
 257                                  * or dump to the standard error.
 258                                  */
 259                                 sz = xread(pack_objects.err, progress,
 260                                           sizeof(progress));
 261                                 if (0 < sz)
 262                                         send_client_data(2, progress, sz);
 263                                 else if (sz == 0) {
 264                                         close(pack_objects.err);
 265                                         pack_objects.err = -1;
 266                                 }
 267                                 else
 268                                         goto fail;
 269                         }
 270                 }
 271
 272                 /* See if the children are still there */
 273                 if (rev_list.pid || pack_objects.pid) {
 274                         pid = waitpid(-1, &status, WNOHANG);
 275                         if (!pid)
 276                                 continue;
 277                         who = ((pid == rev_list.pid) ? "git-rev-list" :
 278                                (pid == pack_objects.pid) ? "git-pack-objects" :
 279                                NULL);
 280                         if (!who) {
 281                                 if (pid < 0) {
 282                                         error("git-upload-pack: %s",
 283                                               strerror(errno));
 284                                         goto fail;
 285                                 }
 286                                 error("git-upload-pack: we weren't "
 287                                       "waiting for %d", pid);
 288                                 continue;
 289                         }
 290                         if (!WIFEXITED(status) || WEXITSTATUS(status) > 0) {
 291                                 error("git-upload-pack: %s died with error.",
 292                                       who);
 293                                 goto fail;
 294                         }
 295                         if (pid == rev_list.pid)
 296                                 rev_list.pid = 0;
 297                         if (pid == pack_objects.pid)
 298                                 pack_objects.pid = 0;
 299                         if (rev_list.pid || pack_objects.pid)
 300                                 continue;
 301                 }
 302
 303                 /* both died happily */
 304                 if (pollsize)
 305                         continue;
 306
 307                 /* flush the data */
 308                 if (0 <= buffered) {
 309                         data[0] = buffered;
 310                         sz = send_client_data(1, data, 1);
 311                         if (sz < 0)
 312                                 goto fail;
 313                         fprintf(stderr, "flushed.\n");
 314                 }
 315                 if (use_sideband)
 316                         packet_flush(1);
 317                 return;
 318         }
 319  fail:
 320         if (pack_objects.pid)
 321                 kill(pack_objects.pid, SIGKILL);
 322         if (rev_list.pid)
 323                 kill(rev_list.pid, SIGKILL);
 324         send_client_data(3, abort_msg, sizeof(abort_msg));
 325         die("git-upload-pack: %s", abort_msg);
 326 #else
 327         ssize_t sz;
 328         char *cp;
 329
 330         /* We read from pack_objects.out to capture the pack data. */
 331
 332         while ((sz = xread(pack_objects.out, data+1, sizeof(data)-1)) > 0) {
 333                 cp = data+1;
 334                 /* Data ready; we keep the last byte to ourselves in case we
 335                  * detect broken rev-list, so that we can leave the stream
 336                  * corrupted.  This is unfortunate -- unpack-objects would
 337                  * happily accept a valid pack data with trailing garbage, so
 338                  * appending garbage after we pass all the pack data is not
 339                  * good enough to signal breakage to downstream.
 340                  */
 341                 if (0 <= buffered) {
 342                         *--cp = buffered;
 343                         sz++;
 344                 }
 345                 if (1 < sz) {
 346                         buffered = cp[sz-1] & 0xFF;
 347                         sz--;
 348                 }
 349                 else
 350                         buffered = -1;
 351                 sz = send_client_data(1, cp, sz);
 352                 if (sz < 0)
 353                         goto fail;
 354         }
 355         if (sz == 0) {
 356                 close(pack_objects.out);
 357                 pack_objects.out = -1;
 358         }
 359         else
 360                 goto fail;
 361
 362         /* flush the data */
 363         if (0 <= buffered) {
 364                 data[0] = buffered;
 365                 sz = send_client_data(1, data, 1);
 366                 if (sz < 0)
 367                         goto fail;
 368                 fprintf(stderr, "flushed.\n");
 369         }
 370         if (use_sideband)
 371                 packet_flush(1);
 372         if (waitpid(pack_objects.pid, NULL, 0) < 0)
 373                 die("git-upload-pack: waiting for pack-objects: %s",
 374                         strerror(errno));
 375         return;
 376
 377  fail:
 378         kill(pack_objects.pid, SIGKILL);
 379         send_client_data(3, abort_msg, sizeof(abort_msg));
 380         die("git-upload-pack: %s", abort_msg);
 381 #endif
 382 }
 383
 384 static int got_sha1(char *hex, unsigned char *sha1)
 385 {
 386         struct object *o;
 387         int we_knew_they_have = 0;
 388
 389         if (get_sha1_hex(hex, sha1))
 390                 die("git-upload-pack: expected SHA1 object, got '%s'", hex);
 391         if (!has_sha1_file(sha1))
 392                 return -1;
 393
 394         o = lookup_object(sha1);
 395         if (!(o && o->parsed))
 396                 o = parse_object(sha1);
 397         if (!o)
 398                 die("oops (%s)", sha1_to_hex(sha1));
 399         if (o->type == OBJ_COMMIT) {
 400                 struct commit_list *parents;
 401                 struct commit *commit = (struct commit *)o;
 402                 if (o->flags & THEY_HAVE)
 403                         we_knew_they_have = 1;
 404                 else
 405                         o->flags |= THEY_HAVE;
 406                 if (!oldest_have || (commit->date < oldest_have))
 407                         oldest_have = commit->date;
 408                 for (parents = commit->parents;
 409                      parents;
 410                      parents = parents->next)
 411                         parents->item->object.flags |= THEY_HAVE;
 412         }
 413         if (!we_knew_they_have) {
 414                 add_object_array(o, NULL, &have_obj);
 415                 return 1;
 416         }
 417         return 0;
 418 }
 419
 420 static int reachable(struct commit *want)
 421 {
 422         struct commit_list *work = NULL;
 423
 424         insert_by_date(want, &work);
 425         while (work) {
 426                 struct commit_list *list = work->next;
 427                 struct commit *commit = work->item;
 428                 free(work);
 429                 work = list;
 430
 431                 if (commit->object.flags & THEY_HAVE) {
 432                         want->object.flags |= COMMON_KNOWN;
 433                         break;
 434                 }
 435                 if (!commit->object.parsed)
 436                         parse_object(commit->object.sha1);
 437                 if (commit->object.flags & REACHABLE)
 438                         continue;
 439                 commit->object.flags |= REACHABLE;
 440                 if (commit->date < oldest_have)
 441                         continue;
 442                 for (list = commit->parents; list; list = list->next) {
 443                         struct commit *parent = list->item;
 444                         if (!(parent->object.flags & REACHABLE))
 445                                 insert_by_date(parent, &work);
 446                 }
 447         }
 448         want->object.flags |= REACHABLE;
 449         clear_commit_marks(want, REACHABLE);
 450         free_commit_list(work);
 451         return (want->object.flags & COMMON_KNOWN);
 452 }
 453
 454 static int ok_to_give_up(void)
 455 {
 456         int i;
 457
 458         if (!have_obj.nr)
 459                 return 0;
 460
 461         for (i = 0; i < want_obj.nr; i++) {
 462                 struct object *want = want_obj.objects[i].item;
 463
 464                 if (want->flags & COMMON_KNOWN)
 465                         continue;
 466                 want = deref_tag(want, "a want line", 0);
 467                 if (!want || want->type != OBJ_COMMIT) {
 468                         /* no way to tell if this is reachable by
 469                          * looking at the ancestry chain alone, so
 470                          * leave a note to ourselves not to worry about
 471                          * this object anymore.
 472                          */
 473                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 474                         continue;
 475                 }
 476                 if (!reachable((struct commit *)want))
 477                         return 0;
 478         }
 479         return 1;
 480 }
 481
 482 static int get_common_commits(void)
 483 {
 484         static char line[1000];
 485         unsigned char sha1[20];
 486         char hex[41], last_hex[41];
 487         int len;
 488
 489         track_object_refs = 0;
 490         save_commit_buffer = 0;
 491
 492         for(;;) {
 493                 len = packet_read_line(0, line, sizeof(line));
 494                 reset_timeout();
 495
 496                 if (!len) {
 497                         if (have_obj.nr == 0 || multi_ack)
 498                                 packet_write(1, "NAK\n");
 499                         continue;
 500                 }
 501                 len = strip(line, len);
 502                 if (!prefixcmp(line, "have ")) {
 503                         switch (got_sha1(line+5, sha1)) {
 504                         case -1: /* they have what we do not */
 505                                 if (multi_ack && ok_to_give_up())
 506                                         packet_write(1, "ACK %s continue\n",
 507                                                      sha1_to_hex(sha1));
 508                                 break;
 509                         default:
 510                                 memcpy(hex, sha1_to_hex(sha1), 41);
 511                                 if (multi_ack) {
 512                                         const char *msg = "ACK %s continue\n";
 513                                         packet_write(1, msg, hex);
 514                                         memcpy(last_hex, hex, 41);
 515                                 }
 516                                 else if (have_obj.nr == 1)
 517                                         packet_write(1, "ACK %s\n", hex);
 518                                 break;
 519                         }
 520                         continue;
 521                 }
 522                 if (!strcmp(line, "done")) {
 523                         if (have_obj.nr > 0) {
 524                                 if (multi_ack)
 525                                         packet_write(1, "ACK %s\n", last_hex);
 526                                 return 0;
 527                         }
 528                         packet_write(1, "NAK\n");
 529                         return -1;
 530                 }
 531                 die("git-upload-pack: expected SHA1 list, got '%s'", line);
 532         }
 533 }
 534
 535 static void receive_needs(void)
 536 {
 537         struct object_array shallows = {0, 0, NULL};
 538         static char line[1000];
 539         int len, depth = 0;
 540
 541         for (;;) {
 542                 struct object *o;
 543                 unsigned char sha1_buf[20];
 544                 len = packet_read_line(0, line, sizeof(line));
 545                 reset_timeout();
 546                 if (!len)
 547                         break;
 548
 549                 if (!prefixcmp(line, "shallow ")) {
 550                         unsigned char sha1[20];
 551                         struct object *object;
 552                         use_thin_pack = 0;
 553                         if (get_sha1(line + 8, sha1))
 554                                 die("invalid shallow line: %s", line);
 555                         object = parse_object(sha1);
 556                         if (!object)
 557                                 die("did not find object for %s", line);
 558                         object->flags |= CLIENT_SHALLOW;
 559                         add_object_array(object, NULL, &shallows);
 560                         continue;
 561                 }
 562                 if (!prefixcmp(line, "deepen ")) {
 563                         char *end;
 564                         use_thin_pack = 0;
 565                         depth = strtol(line + 7, &end, 0);
 566                         if (end == line + 7 || depth <= 0)
 567                                 die("Invalid deepen: %s", line);
 568                         continue;
 569                 }
 570                 if (prefixcmp(line, "want ") ||
 571                     get_sha1_hex(line+5, sha1_buf))
 572                         die("git-upload-pack: protocol error, "
 573                             "expected to get sha, not '%s'", line);
 574                 if (strstr(line+45, "multi_ack"))
 575                         multi_ack = 1;
 576                 if (strstr(line+45, "thin-pack"))
 577                         use_thin_pack = 1;
 578                 if (strstr(line+45, "ofs-delta"))
 579                         use_ofs_delta = 1;
 580 #ifndef __MINGW32__
 581                 if (strstr(line+45, "side-band-64k"))
 582                         use_sideband = LARGE_PACKET_MAX;
 583                 else if (strstr(line+45, "side-band"))
 584                         use_sideband = DEFAULT_PACKET_MAX;
 585 #endif
 586                 if (strstr(line+45, "no-progress"))
 587                         no_progress = 1;
 588
 589                 /* We have sent all our refs already, and the other end
 590                  * should have chosen out of them; otherwise they are
 591                  * asking for nonsense.
 592                  *
 593                  * Hmph.  We may later want to allow "want" line that
 594                  * asks for something like "master~10" (symbolic)...
 595                  * would it make sense?  I don't know.
 596                  */
 597                 o = lookup_object(sha1_buf);
 598                 if (!o || !(o->flags & OUR_REF))
 599                         die("git-upload-pack: not our ref %s", line+5);
 600                 if (!(o->flags & WANTED)) {
 601                         o->flags |= WANTED;
 602                         add_object_array(o, NULL, &want_obj);
 603                 }
 604         }
 605         if (depth == 0 && shallows.nr == 0)
 606                 return;
 607         if (depth > 0) {
 608                 struct commit_list *result, *backup;
 609                 int i;
 610                 backup = result = get_shallow_commits(&want_obj, depth,
 611                         SHALLOW, NOT_SHALLOW);
 612                 while (result) {
 613                         struct object *object = &result->item->object;
 614                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 615                                 packet_write(1, "shallow %s",
 616                                                 sha1_to_hex(object->sha1));
 617                                 register_shallow(object->sha1);
 618                         }
 619                         result = result->next;
 620                 }
 621                 free_commit_list(backup);
 622                 for (i = 0; i < shallows.nr; i++) {
 623                         struct object *object = shallows.objects[i].item;
 624                         if (object->flags & NOT_SHALLOW) {
 625                                 struct commit_list *parents;
 626                                 packet_write(1, "unshallow %s",
 627                                         sha1_to_hex(object->sha1));
 628                                 object->flags &= ~CLIENT_SHALLOW;
 629                                 /* make sure the real parents are parsed */
 630                                 unregister_shallow(object->sha1);
 631                                 object->parsed = 0;
 632                                 parse_commit((struct commit *)object);
 633                                 parents = ((struct commit *)object)->parents;
 634                                 while (parents) {
 635                                         add_object_array(&parents->item->object,
 636                                                         NULL, &want_obj);
 637                                         parents = parents->next;
 638                                 }
 639                         }
 640                         /* make sure commit traversal conforms to client */
 641                         register_shallow(object->sha1);
 642                 }
 643                 packet_flush(1);
 644         } else
 645                 if (shallows.nr > 0) {
 646                         int i;
 647                         for (i = 0; i < shallows.nr; i++)
 648                                 register_shallow(shallows.objects[i].item->sha1);
 649                 }
 650         free(shallows.objects);
 651 }
 652
 653 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 654 {
 655         static const char *capabilities = "multi_ack thin-pack side-band"
 656                 " side-band-64k ofs-delta shallow no-progress";
 657         struct object *o = parse_object(sha1);
 658
 659         if (!o)
 660                 die("git-upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 661
 662         if (capabilities)
 663                 packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
 664                         0, capabilities);
 665         else
 666                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
 667         capabilities = NULL;
 668         if (!(o->flags & OUR_REF)) {
 669                 o->flags |= OUR_REF;
 670                 nr_our_refs++;
 671         }
 672         if (o->type == OBJ_TAG) {
 673                 o = deref_tag(o, refname, 0);
 674                 packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
 675         }
 676         return 0;
 677 }
 678
 679 static void upload_pack(void)
 680 {
 681         reset_timeout();
 682         head_ref(send_ref, NULL);
 683         for_each_ref(send_ref, NULL);
 684         packet_flush(1);
 685         receive_needs();
 686         if (want_obj.nr) {
 687                 get_common_commits();
 688                 create_pack_file();
 689         }
 690 }
 691
 692 int main(int argc, char **argv)
 693 {
 694         char *dir;
 695         int i;
 696         int strict = 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, "--strict")) {
 704                         strict = 1;
 705                         continue;
 706                 }
 707                 if (!prefixcmp(arg, "--timeout=")) {
 708                         timeout = atoi(arg+10);
 709                         continue;
 710                 }
 711                 if (!strcmp(arg, "--")) {
 712                         i++;
 713                         break;
 714                 }
 715         }
 716
 717         if (i != argc-1)
 718                 usage(upload_pack_usage);
 719         dir = argv[i];
 720
 721         if (!enter_repo(dir, strict))
 722                 die("'%s': unable to chdir or not a git archive", dir);
 723         if (is_repository_shallow())
 724                 die("attempt to fetch/clone from a shallow repository");
 725         upload_pack();
 726         return 0;
 727 }