git.oblomov.eu Git - git/blob - 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, 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
  43 static void reset_timeout(void)
  44 {
  45         alarm(timeout);
  46 }
  47
  48 static int strip(char *line, int len)
  49 {
  50         if (len && line[len-1] == '\n')
  51                 line[--len] = 0;
  52         return len;
  53 }
  54
  55 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  56 {
  57         if (use_sideband)
  58                 return send_sideband(1, fd, data, sz, use_sideband);
  59         if (fd == 3)
  60                 /* emergency quit */
  61                 fd = 2;
  62         if (fd == 2) {
  63                 /* XXX: are we happy to lose stuff here? */
  64                 xwrite(fd, data, sz);
  65                 return sz;
  66         }
  67         return safe_write(fd, data, sz);
  68 }
  69
  70 static FILE *pack_pipe = NULL;
  71 static void show_commit(struct commit *commit, void *data)
  72 {
  73         if (commit->object.flags & BOUNDARY)
  74                 fputc('-', pack_pipe);
  75         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
  76                 die("broken output pipe");
  77         fputc('\n', pack_pipe);
  78         fflush(pack_pipe);
  79         free(commit->buffer);
  80         commit->buffer = NULL;
  81 }
  82
  83 static void show_object(struct object *obj, const struct name_path *path, const char *component)
  84 {
  85         /* An object with name "foo\n0000000..." can be used to
  86          * confuse downstream git-pack-objects very badly.
  87          */
  88         const char *name = path_name(path, component);
  89         const char *ep = strchr(name, '\n');
  90         if (ep) {
  91                 fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(obj->sha1),
  92                        (int) (ep - name),
  93                        name);
  94         }
  95         else
  96                 fprintf(pack_pipe, "%s %s\n",
  97                                 sha1_to_hex(obj->sha1), name);
  98         free((char *)name);
  99 }
 100
 101 static void show_edge(struct commit *commit)
 102 {
 103         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
 104 }
 105
 106 static int do_rev_list(int fd, void *create_full_pack)
 107 {
 108         int i;
 109         struct rev_info revs;
 110
 111         pack_pipe = xfdopen(fd, "w");
 112         init_revisions(&revs, NULL);
 113         revs.tag_objects = 1;
 114         revs.tree_objects = 1;
 115         revs.blob_objects = 1;
 116         if (use_thin_pack)
 117                 revs.edge_hint = 1;
 118
 119         if (create_full_pack) {
 120                 const char *args[] = {"rev-list", "--all", NULL};
 121                 setup_revisions(2, args, &revs, NULL);
 122         } else {
 123                 for (i = 0; i < want_obj.nr; i++) {
 124                         struct object *o = want_obj.objects[i].item;
 125                         /* why??? */
 126                         o->flags &= ~UNINTERESTING;
 127                         add_pending_object(&revs, o, NULL);
 128                 }
 129                 for (i = 0; i < have_obj.nr; i++) {
 130                         struct object *o = have_obj.objects[i].item;
 131                         o->flags |= UNINTERESTING;
 132                         add_pending_object(&revs, o, NULL);
 133                 }
 134                 setup_revisions(0, NULL, &revs, NULL);
 135         }
 136         if (prepare_revision_walk(&revs))
 137                 die("revision walk setup failed");
 138         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 139         if (use_thin_pack)
 140                 for (i = 0; i < extra_edge_obj.nr; i++)
 141                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
 142                                         extra_edge_obj.objects[i].item->sha1));
 143         traverse_commit_list(&revs, show_commit, show_object, NULL);
 144         fflush(pack_pipe);
 145         fclose(pack_pipe);
 146         return 0;
 147 }
 148
 149 static void create_pack_file(void)
 150 {
 151         struct async rev_list;
 152         struct child_process pack_objects;
 153         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
 154         char data[8193], progress[128];
 155         char abort_msg[] = "aborting due to possible repository "
 156                 "corruption on the remote side.";
 157         int buffered = -1;
 158         ssize_t sz;
 159         const char *argv[10];
 160         int arg = 0;
 161
 162         if (shallow_nr) {
 163                 rev_list.proc = do_rev_list;
 164                 rev_list.data = 0;
 165                 if (start_async(&rev_list))
 166                         die("git upload-pack: unable to fork git-rev-list");
 167                 argv[arg++] = "pack-objects";
 168         } else {
 169                 argv[arg++] = "pack-objects";
 170                 argv[arg++] = "--revs";
 171                 if (create_full_pack)
 172                         argv[arg++] = "--all";
 173                 else if (use_thin_pack)
 174                         argv[arg++] = "--thin";
 175         }
 176
 177         argv[arg++] = "--stdout";
 178         if (!no_progress)
 179                 argv[arg++] = "--progress";
 180         if (use_ofs_delta)
 181                 argv[arg++] = "--delta-base-offset";
 182         if (use_include_tag)
 183                 argv[arg++] = "--include-tag";
 184         argv[arg++] = NULL;
 185
 186         memset(&pack_objects, 0, sizeof(pack_objects));
 187         pack_objects.in = shallow_nr ? rev_list.out : -1;
 188         pack_objects.out = -1;
 189         pack_objects.err = -1;
 190         pack_objects.git_cmd = 1;
 191         pack_objects.argv = argv;
 192
 193         if (start_command(&pack_objects))
 194                 die("git upload-pack: unable to fork git-pack-objects");
 195
 196         /* pass on revisions we (don't) want */
 197         if (!shallow_nr) {
 198                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
 199                 if (!create_full_pack) {
 200                         int i;
 201                         for (i = 0; i < want_obj.nr; i++)
 202                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(want_obj.objects[i].item->sha1));
 203                         fprintf(pipe_fd, "--not\n");
 204                         for (i = 0; i < have_obj.nr; i++)
 205                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(have_obj.objects[i].item->sha1));
 206                 }
 207
 208                 fprintf(pipe_fd, "\n");
 209                 fflush(pipe_fd);
 210                 fclose(pipe_fd);
 211         }
 212
 213
 214         /* We read from pack_objects.err to capture stderr output for
 215          * progress bar, and pack_objects.out to capture the pack data.
 216          */
 217
 218         while (1) {
 219                 struct pollfd pfd[2];
 220                 int pe, pu, pollsize;
 221
 222                 reset_timeout();
 223
 224                 pollsize = 0;
 225                 pe = pu = -1;
 226
 227                 if (0 <= pack_objects.out) {
 228                         pfd[pollsize].fd = pack_objects.out;
 229                         pfd[pollsize].events = POLLIN;
 230                         pu = pollsize;
 231                         pollsize++;
 232                 }
 233                 if (0 <= pack_objects.err) {
 234                         pfd[pollsize].fd = pack_objects.err;
 235                         pfd[pollsize].events = POLLIN;
 236                         pe = pollsize;
 237                         pollsize++;
 238                 }
 239
 240                 if (!pollsize)
 241                         break;
 242
 243                 if (poll(pfd, pollsize, -1) < 0) {
 244                         if (errno != EINTR) {
 245                                 error("poll failed, resuming: %s",
 246                                       strerror(errno));
 247                                 sleep(1);
 248                         }
 249                         continue;
 250                 }
 251                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 252                         /* Status ready; we ship that in the side-band
 253                          * or dump to the standard error.
 254                          */
 255                         sz = xread(pack_objects.err, progress,
 256                                   sizeof(progress));
 257                         if (0 < sz)
 258                                 send_client_data(2, progress, sz);
 259                         else if (sz == 0) {
 260                                 close(pack_objects.err);
 261                                 pack_objects.err = -1;
 262                         }
 263                         else
 264                                 goto fail;
 265                         /* give priority to status messages */
 266                         continue;
 267                 }
 268                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 269                         /* Data ready; we keep the last byte to ourselves
 270                          * in case we detect broken rev-list, so that we
 271                          * can leave the stream corrupted.  This is
 272                          * unfortunate -- unpack-objects would happily
 273                          * accept a valid packdata with trailing garbage,
 274                          * so appending garbage after we pass all the
 275                          * pack data is not good enough to signal
 276                          * breakage to downstream.
 277                          */
 278                         char *cp = data;
 279                         ssize_t outsz = 0;
 280                         if (0 <= buffered) {
 281                                 *cp++ = buffered;
 282                                 outsz++;
 283                         }
 284                         sz = xread(pack_objects.out, cp,
 285                                   sizeof(data) - outsz);
 286                         if (0 < sz)
 287                                 ;
 288                         else if (sz == 0) {
 289                                 close(pack_objects.out);
 290                                 pack_objects.out = -1;
 291                         }
 292                         else
 293                                 goto fail;
 294                         sz += outsz;
 295                         if (1 < sz) {
 296                                 buffered = data[sz-1] & 0xFF;
 297                                 sz--;
 298                         }
 299                         else
 300                                 buffered = -1;
 301                         sz = send_client_data(1, data, sz);
 302                         if (sz < 0)
 303                                 goto fail;
 304                 }
 305         }
 306
 307         if (finish_command(&pack_objects)) {
 308                 error("git upload-pack: git-pack-objects died with error.");
 309                 goto fail;
 310         }
 311         if (shallow_nr && finish_async(&rev_list))
 312                 goto fail;      /* error was already reported */
 313
 314         /* flush the data */
 315         if (0 <= buffered) {
 316                 data[0] = buffered;
 317                 sz = send_client_data(1, data, 1);
 318                 if (sz < 0)
 319                         goto fail;
 320                 fprintf(stderr, "flushed.\n");
 321         }
 322         if (use_sideband)
 323                 packet_flush(1);
 324         return;
 325
 326  fail:
 327         send_client_data(3, abort_msg, sizeof(abort_msg));
 328         die("git upload-pack: %s", abort_msg);
 329 }
 330
 331 static int got_sha1(char *hex, unsigned char *sha1)
 332 {
 333         struct object *o;
 334         int we_knew_they_have = 0;
 335
 336         if (get_sha1_hex(hex, sha1))
 337                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 338         if (!has_sha1_file(sha1))
 339                 return -1;
 340
 341         o = lookup_object(sha1);
 342         if (!(o && o->parsed))
 343                 o = parse_object(sha1);
 344         if (!o)
 345                 die("oops (%s)", sha1_to_hex(sha1));
 346         if (o->type == OBJ_COMMIT) {
 347                 struct commit_list *parents;
 348                 struct commit *commit = (struct commit *)o;
 349                 if (o->flags & THEY_HAVE)
 350                         we_knew_they_have = 1;
 351                 else
 352                         o->flags |= THEY_HAVE;
 353                 if (!oldest_have || (commit->date < oldest_have))
 354                         oldest_have = commit->date;
 355                 for (parents = commit->parents;
 356                      parents;
 357                      parents = parents->next)
 358                         parents->item->object.flags |= THEY_HAVE;
 359         }
 360         if (!we_knew_they_have) {
 361                 add_object_array(o, NULL, &have_obj);
 362                 return 1;
 363         }
 364         return 0;
 365 }
 366
 367 static int reachable(struct commit *want)
 368 {
 369         struct commit_list *work = NULL;
 370
 371         insert_by_date(want, &work);
 372         while (work) {
 373                 struct commit_list *list = work->next;
 374                 struct commit *commit = work->item;
 375                 free(work);
 376                 work = list;
 377
 378                 if (commit->object.flags & THEY_HAVE) {
 379                         want->object.flags |= COMMON_KNOWN;
 380                         break;
 381                 }
 382                 if (!commit->object.parsed)
 383                         parse_object(commit->object.sha1);
 384                 if (commit->object.flags & REACHABLE)
 385                         continue;
 386                 commit->object.flags |= REACHABLE;
 387                 if (commit->date < oldest_have)
 388                         continue;
 389                 for (list = commit->parents; list; list = list->next) {
 390                         struct commit *parent = list->item;
 391                         if (!(parent->object.flags & REACHABLE))
 392                                 insert_by_date(parent, &work);
 393                 }
 394         }
 395         want->object.flags |= REACHABLE;
 396         clear_commit_marks(want, REACHABLE);
 397         free_commit_list(work);
 398         return (want->object.flags & COMMON_KNOWN);
 399 }
 400
 401 static int ok_to_give_up(void)
 402 {
 403         int i;
 404
 405         if (!have_obj.nr)
 406                 return 0;
 407
 408         for (i = 0; i < want_obj.nr; i++) {
 409                 struct object *want = want_obj.objects[i].item;
 410
 411                 if (want->flags & COMMON_KNOWN)
 412                         continue;
 413                 want = deref_tag(want, "a want line", 0);
 414                 if (!want || want->type != OBJ_COMMIT) {
 415                         /* no way to tell if this is reachable by
 416                          * looking at the ancestry chain alone, so
 417                          * leave a note to ourselves not to worry about
 418                          * this object anymore.
 419                          */
 420                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 421                         continue;
 422                 }
 423                 if (!reachable((struct commit *)want))
 424                         return 0;
 425         }
 426         return 1;
 427 }
 428
 429 static int get_common_commits(void)
 430 {
 431         static char line[1000];
 432         unsigned char sha1[20];
 433         char hex[41], last_hex[41];
 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 (have_obj.nr == 0 || multi_ack)
 443                                 packet_write(1, "NAK\n");
 444                         continue;
 445                 }
 446                 strip(line, len);
 447                 if (!prefixcmp(line, "have ")) {
 448                         switch (got_sha1(line+5, sha1)) {
 449                         case -1: /* they have what we do not */
 450                                 if (multi_ack && ok_to_give_up())
 451                                         packet_write(1, "ACK %s continue\n",
 452                                                      sha1_to_hex(sha1));
 453                                 break;
 454                         default:
 455                                 memcpy(hex, sha1_to_hex(sha1), 41);
 456                                 if (multi_ack) {
 457                                         const char *msg = "ACK %s continue\n";
 458                                         packet_write(1, msg, hex);
 459                                         memcpy(last_hex, hex, 41);
 460                                 }
 461                                 else if (have_obj.nr == 1)
 462                                         packet_write(1, "ACK %s\n", hex);
 463                                 break;
 464                         }
 465                         continue;
 466                 }
 467                 if (!strcmp(line, "done")) {
 468                         if (have_obj.nr > 0) {
 469                                 if (multi_ack)
 470                                         packet_write(1, "ACK %s\n", last_hex);
 471                                 return 0;
 472                         }
 473                         packet_write(1, "NAK\n");
 474                         return -1;
 475                 }
 476                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 477         }
 478 }
 479
 480 static void receive_needs(void)
 481 {
 482         struct object_array shallows = {0, 0, NULL};
 483         static char line[1000];
 484         int len, depth = 0;
 485
 486         shallow_nr = 0;
 487         if (debug_fd)
 488                 write_str_in_full(debug_fd, "#S\n");
 489         for (;;) {
 490                 struct object *o;
 491                 unsigned char sha1_buf[20];
 492                 len = packet_read_line(0, line, sizeof(line));
 493                 reset_timeout();
 494                 if (!len)
 495                         break;
 496                 if (debug_fd)
 497                         write_in_full(debug_fd, line, len);
 498
 499                 if (!prefixcmp(line, "shallow ")) {
 500                         unsigned char sha1[20];
 501                         struct object *object;
 502                         if (get_sha1(line + 8, sha1))
 503                                 die("invalid shallow line: %s", line);
 504                         object = parse_object(sha1);
 505                         if (!object)
 506                                 die("did not find object for %s", line);
 507                         object->flags |= CLIENT_SHALLOW;
 508                         add_object_array(object, NULL, &shallows);
 509                         continue;
 510                 }
 511                 if (!prefixcmp(line, "deepen ")) {
 512                         char *end;
 513                         depth = strtol(line + 7, &end, 0);
 514                         if (end == line + 7 || depth <= 0)
 515                                 die("Invalid deepen: %s", line);
 516                         continue;
 517                 }
 518                 if (prefixcmp(line, "want ") ||
 519                     get_sha1_hex(line+5, sha1_buf))
 520                         die("git upload-pack: protocol error, "
 521                             "expected to get sha, not '%s'", line);
 522                 if (strstr(line+45, "multi_ack"))
 523                         multi_ack = 1;
 524                 if (strstr(line+45, "thin-pack"))
 525                         use_thin_pack = 1;
 526                 if (strstr(line+45, "ofs-delta"))
 527                         use_ofs_delta = 1;
 528                 if (strstr(line+45, "side-band-64k"))
 529                         use_sideband = LARGE_PACKET_MAX;
 530                 else if (strstr(line+45, "side-band"))
 531                         use_sideband = DEFAULT_PACKET_MAX;
 532                 if (strstr(line+45, "no-progress"))
 533                         no_progress = 1;
 534                 if (strstr(line+45, "include-tag"))
 535                         use_include_tag = 1;
 536
 537                 /* We have sent all our refs already, and the other end
 538                  * should have chosen out of them; otherwise they are
 539                  * asking for nonsense.
 540                  *
 541                  * Hmph.  We may later want to allow "want" line that
 542                  * asks for something like "master~10" (symbolic)...
 543                  * would it make sense?  I don't know.
 544                  */
 545                 o = lookup_object(sha1_buf);
 546                 if (!o || !(o->flags & OUR_REF))
 547                         die("git upload-pack: not our ref %s", line+5);
 548                 if (!(o->flags & WANTED)) {
 549                         o->flags |= WANTED;
 550                         add_object_array(o, NULL, &want_obj);
 551                 }
 552         }
 553         if (debug_fd)
 554                 write_str_in_full(debug_fd, "#E\n");
 555
 556         if (!use_sideband && daemon_mode)
 557                 no_progress = 1;
 558
 559         if (depth == 0 && shallows.nr == 0)
 560                 return;
 561         if (depth > 0) {
 562                 struct commit_list *result, *backup;
 563                 int i;
 564                 backup = result = get_shallow_commits(&want_obj, depth,
 565                         SHALLOW, NOT_SHALLOW);
 566                 while (result) {
 567                         struct object *object = &result->item->object;
 568                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 569                                 packet_write(1, "shallow %s",
 570                                                 sha1_to_hex(object->sha1));
 571                                 register_shallow(object->sha1);
 572                                 shallow_nr++;
 573                         }
 574                         result = result->next;
 575                 }
 576                 free_commit_list(backup);
 577                 for (i = 0; i < shallows.nr; i++) {
 578                         struct object *object = shallows.objects[i].item;
 579                         if (object->flags & NOT_SHALLOW) {
 580                                 struct commit_list *parents;
 581                                 packet_write(1, "unshallow %s",
 582                                         sha1_to_hex(object->sha1));
 583                                 object->flags &= ~CLIENT_SHALLOW;
 584                                 /* make sure the real parents are parsed */
 585                                 unregister_shallow(object->sha1);
 586                                 object->parsed = 0;
 587                                 if (parse_commit((struct commit *)object))
 588                                         die("invalid commit");
 589                                 parents = ((struct commit *)object)->parents;
 590                                 while (parents) {
 591                                         add_object_array(&parents->item->object,
 592                                                         NULL, &want_obj);
 593                                         parents = parents->next;
 594                                 }
 595                                 add_object_array(object, NULL, &extra_edge_obj);
 596                         }
 597                         /* make sure commit traversal conforms to client */
 598                         register_shallow(object->sha1);
 599                 }
 600                 packet_flush(1);
 601         } else
 602                 if (shallows.nr > 0) {
 603                         int i;
 604                         for (i = 0; i < shallows.nr; i++)
 605                                 register_shallow(shallows.objects[i].item->sha1);
 606                 }
 607
 608         shallow_nr += shallows.nr;
 609         free(shallows.objects);
 610 }
 611
 612 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 613 {
 614         static const char *capabilities = "multi_ack thin-pack side-band"
 615                 " side-band-64k ofs-delta shallow no-progress"
 616                 " include-tag";
 617         struct object *o = parse_object(sha1);
 618
 619         if (!o)
 620                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 621
 622         if (capabilities)
 623                 packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
 624                         0, capabilities);
 625         else
 626                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
 627         capabilities = NULL;
 628         if (!(o->flags & OUR_REF)) {
 629                 o->flags |= OUR_REF;
 630                 nr_our_refs++;
 631         }
 632         if (o->type == OBJ_TAG) {
 633                 o = deref_tag(o, refname, 0);
 634                 if (o)
 635                         packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
 636         }
 637         return 0;
 638 }
 639
 640 static void upload_pack(void)
 641 {
 642         reset_timeout();
 643         head_ref(send_ref, NULL);
 644         for_each_ref(send_ref, NULL);
 645         packet_flush(1);
 646         receive_needs();
 647         if (want_obj.nr) {
 648                 get_common_commits();
 649                 create_pack_file();
 650         }
 651 }
 652
 653 int main(int argc, char **argv)
 654 {
 655         char *dir;
 656         int i;
 657         int strict = 0;
 658
 659         git_extract_argv0_path(argv[0]);
 660         read_replace_refs = 0;
 661
 662         for (i = 1; i < argc; i++) {
 663                 char *arg = argv[i];
 664
 665                 if (arg[0] != '-')
 666                         break;
 667                 if (!strcmp(arg, "--strict")) {
 668                         strict = 1;
 669                         continue;
 670                 }
 671                 if (!prefixcmp(arg, "--timeout=")) {
 672                         timeout = atoi(arg+10);
 673                         daemon_mode = 1;
 674                         continue;
 675                 }
 676                 if (!strcmp(arg, "--")) {
 677                         i++;
 678                         break;
 679                 }
 680         }
 681
 682         if (i != argc-1)
 683                 usage(upload_pack_usage);
 684
 685         setup_path();
 686
 687         dir = argv[i];
 688
 689         if (!enter_repo(dir, strict))
 690                 die("'%s' does not appear to be a git repository", dir);
 691         if (is_repository_shallow())
 692                 die("attempt to fetch/clone from a shallow repository");
 693         if (getenv("GIT_DEBUG_SEND_PACK"))
 694                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
 695         upload_pack();
 696         return 0;
 697 }