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
  13 static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
  14
  15 /* bits #0..7 in revision.h, #8..10 in commit.c */
  16 #define THEY_HAVE       (1u << 11)
  17 #define OUR_REF         (1u << 12)
  18 #define WANTED          (1u << 13)
  19 #define COMMON_KNOWN    (1u << 14)
  20 #define REACHABLE       (1u << 15)
  21
  22 #define SHALLOW         (1u << 16)
  23 #define NOT_SHALLOW     (1u << 17)
  24 #define CLIENT_SHALLOW  (1u << 18)
  25
  26 static unsigned long oldest_have;
  27
  28 static int multi_ack, nr_our_refs;
  29 static int use_thin_pack, use_ofs_delta, no_progress;
  30 static struct object_array have_obj;
  31 static struct object_array want_obj;
  32 static unsigned int timeout;
  33 /* 0 for no sideband,
  34  * otherwise maximum packet size (up to 65520 bytes).
  35  */
  36 static int use_sideband;
  37
  38 static void reset_timeout(void)
  39 {
  40         alarm(timeout);
  41 }
  42
  43 static int strip(char *line, int len)
  44 {
  45         if (len && line[len-1] == '\n')
  46                 line[--len] = 0;
  47         return len;
  48 }
  49
  50 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  51 {
  52         if (use_sideband)
  53                 return send_sideband(1, fd, data, sz, use_sideband);
  54         if (fd == 3)
  55                 /* emergency quit */
  56                 fd = 2;
  57         if (fd == 2) {
  58                 /* XXX: are we happy to lose stuff here? */
  59                 xwrite(fd, data, sz);
  60                 return sz;
  61         }
  62         return safe_write(fd, data, sz);
  63 }
  64
  65 static FILE *pack_pipe = NULL;
  66 static void show_commit(struct commit *commit)
  67 {
  68         if (commit->object.flags & BOUNDARY)
  69                 fputc('-', pack_pipe);
  70         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
  71                 die("broken output pipe");
  72         fputc('\n', pack_pipe);
  73         fflush(pack_pipe);
  74         free(commit->buffer);
  75         commit->buffer = NULL;
  76 }
  77
  78 static void show_object(struct object_array_entry *p)
  79 {
  80         /* An object with name "foo\n0000000..." can be used to
  81          * confuse downstream git-pack-objects very badly.
  82          */
  83         const char *ep = strchr(p->name, '\n');
  84         if (ep) {
  85                 fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(p->item->sha1),
  86                        (int) (ep - p->name),
  87                        p->name);
  88         }
  89         else
  90                 fprintf(pack_pipe, "%s %s\n",
  91                                 sha1_to_hex(p->item->sha1), p->name);
  92 }
  93
  94 static void show_edge(struct commit *commit)
  95 {
  96         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
  97 }
  98
  99 static void create_pack_file(void)
 100 {
 101         /* Pipes between rev-list to pack-objects, pack-objects to us
 102          * and pack-objects error stream for progress bar.
 103          */
 104         int lp_pipe[2], pu_pipe[2], pe_pipe[2];
 105         pid_t pid_rev_list, pid_pack_objects;
 106         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
 107         char data[8193], progress[128];
 108         char abort_msg[] = "aborting due to possible repository "
 109                 "corruption on the remote side.";
 110         int buffered = -1;
 111
 112         if (pipe(lp_pipe) < 0)
 113                 die("git-upload-pack: unable to create pipe");
 114         pid_rev_list = fork();
 115         if (pid_rev_list < 0)
 116                 die("git-upload-pack: unable to fork git-rev-list");
 117
 118         if (!pid_rev_list) {
 119                 int i;
 120                 struct rev_info revs;
 121
 122                 close(lp_pipe[0]);
 123                 pack_pipe = fdopen(lp_pipe[1], "w");
 124
 125                 if (create_full_pack)
 126                         use_thin_pack = 0; /* no point doing it */
 127                 init_revisions(&revs, NULL);
 128                 revs.tag_objects = 1;
 129                 revs.tree_objects = 1;
 130                 revs.blob_objects = 1;
 131                 if (use_thin_pack)
 132                         revs.edge_hint = 1;
 133
 134                 if (create_full_pack) {
 135                         const char *args[] = {"rev-list", "--all", NULL};
 136                         setup_revisions(2, args, &revs, NULL);
 137                 } else {
 138                         for (i = 0; i < want_obj.nr; i++) {
 139                                 struct object *o = want_obj.objects[i].item;
 140                                 /* why??? */
 141                                 o->flags &= ~UNINTERESTING;
 142                                 add_pending_object(&revs, o, NULL);
 143                         }
 144                         for (i = 0; i < have_obj.nr; i++) {
 145                                 struct object *o = have_obj.objects[i].item;
 146                                 o->flags |= UNINTERESTING;
 147                                 add_pending_object(&revs, o, NULL);
 148                         }
 149                         setup_revisions(0, NULL, &revs, NULL);
 150                 }
 151                 prepare_revision_walk(&revs);
 152                 mark_edges_uninteresting(revs.commits, &revs, show_edge);
 153                 traverse_commit_list(&revs, show_commit, show_object);
 154                 exit(0);
 155         }
 156
 157         if (pipe(pu_pipe) < 0)
 158                 die("git-upload-pack: unable to create pipe");
 159         if (pipe(pe_pipe) < 0)
 160                 die("git-upload-pack: unable to create pipe");
 161         pid_pack_objects = fork();
 162         if (pid_pack_objects < 0) {
 163                 /* daemon sets things up to ignore TERM */
 164                 kill(pid_rev_list, SIGKILL);
 165                 die("git-upload-pack: unable to fork git-pack-objects");
 166         }
 167         if (!pid_pack_objects) {
 168                 const char *argv[10];
 169                 int i = 0;
 170
 171                 dup2(lp_pipe[0], 0);
 172                 dup2(pu_pipe[1], 1);
 173                 dup2(pe_pipe[1], 2);
 174
 175                 close(lp_pipe[0]);
 176                 close(lp_pipe[1]);
 177                 close(pu_pipe[0]);
 178                 close(pu_pipe[1]);
 179                 close(pe_pipe[0]);
 180                 close(pe_pipe[1]);
 181
 182                 argv[i++] = "pack-objects";
 183                 argv[i++] = "--stdout";
 184                 if (!no_progress)
 185                         argv[i++] = "--progress";
 186                 if (use_ofs_delta)
 187                         argv[i++] = "--delta-base-offset";
 188                 argv[i++] = NULL;
 189
 190                 execv_git_cmd(argv);
 191                 kill(pid_rev_list, SIGKILL);
 192                 die("git-upload-pack: unable to exec git-pack-objects");
 193         }
 194
 195         close(lp_pipe[0]);
 196         close(lp_pipe[1]);
 197
 198         /* We read from pe_pipe[0] to capture stderr output for
 199          * progress bar, and pu_pipe[0] to capture the pack data.
 200          */
 201         close(pe_pipe[1]);
 202         close(pu_pipe[1]);
 203
 204         while (1) {
 205                 const char *who;
 206                 struct pollfd pfd[2];
 207                 pid_t pid;
 208                 int status;
 209                 ssize_t sz;
 210                 int pe, pu, pollsize;
 211
 212                 reset_timeout();
 213
 214                 pollsize = 0;
 215                 pe = pu = -1;
 216
 217                 if (0 <= pu_pipe[0]) {
 218                         pfd[pollsize].fd = pu_pipe[0];
 219                         pfd[pollsize].events = POLLIN;
 220                         pu = pollsize;
 221                         pollsize++;
 222                 }
 223                 if (0 <= pe_pipe[0]) {
 224                         pfd[pollsize].fd = pe_pipe[0];
 225                         pfd[pollsize].events = POLLIN;
 226                         pe = pollsize;
 227                         pollsize++;
 228                 }
 229
 230                 if (pollsize) {
 231                         if (poll(pfd, pollsize, -1) < 0) {
 232                                 if (errno != EINTR) {
 233                                         error("poll failed, resuming: %s",
 234                                               strerror(errno));
 235                                         sleep(1);
 236                                 }
 237                                 continue;
 238                         }
 239                         if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 240                                 /* Data ready; we keep the last byte
 241                                  * to ourselves in case we detect
 242                                  * broken rev-list, so that we can
 243                                  * leave the stream corrupted.  This
 244                                  * is unfortunate -- unpack-objects
 245                                  * would happily accept a valid pack
 246                                  * data with trailing garbage, so
 247                                  * appending garbage after we pass all
 248                                  * the pack data is not good enough to
 249                                  * signal breakage to downstream.
 250                                  */
 251                                 char *cp = data;
 252                                 ssize_t outsz = 0;
 253                                 if (0 <= buffered) {
 254                                         *cp++ = buffered;
 255                                         outsz++;
 256                                 }
 257                                 sz = xread(pu_pipe[0], cp,
 258                                           sizeof(data) - outsz);
 259                                 if (0 < sz)
 260                                                 ;
 261                                 else if (sz == 0) {
 262                                         close(pu_pipe[0]);
 263                                         pu_pipe[0] = -1;
 264                                 }
 265                                 else
 266                                         goto fail;
 267                                 sz += outsz;
 268                                 if (1 < sz) {
 269                                         buffered = data[sz-1] & 0xFF;
 270                                         sz--;
 271                                 }
 272                                 else
 273                                         buffered = -1;
 274                                 sz = send_client_data(1, data, sz);
 275                                 if (sz < 0)
 276                                         goto fail;
 277                         }
 278                         if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 279                                 /* Status ready; we ship that in the side-band
 280                                  * or dump to the standard error.
 281                                  */
 282                                 sz = xread(pe_pipe[0], progress,
 283                                           sizeof(progress));
 284                                 if (0 < sz)
 285                                         send_client_data(2, progress, sz);
 286                                 else if (sz == 0) {
 287                                         close(pe_pipe[0]);
 288                                         pe_pipe[0] = -1;
 289                                 }
 290                                 else
 291                                         goto fail;
 292                         }
 293                 }
 294
 295                 /* See if the children are still there */
 296                 if (pid_rev_list || pid_pack_objects) {
 297                         pid = waitpid(-1, &status, WNOHANG);
 298                         if (!pid)
 299                                 continue;
 300                         who = ((pid == pid_rev_list) ? "git-rev-list" :
 301                                (pid == pid_pack_objects) ? "git-pack-objects" :
 302                                NULL);
 303                         if (!who) {
 304                                 if (pid < 0) {
 305                                         error("git-upload-pack: %s",
 306                                               strerror(errno));
 307                                         goto fail;
 308                                 }
 309                                 error("git-upload-pack: we weren't "
 310                                       "waiting for %d", pid);
 311                                 continue;
 312                         }
 313                         if (!WIFEXITED(status) || WEXITSTATUS(status) > 0) {
 314                                 error("git-upload-pack: %s died with error.",
 315                                       who);
 316                                 goto fail;
 317                         }
 318                         if (pid == pid_rev_list)
 319                                 pid_rev_list = 0;
 320                         if (pid == pid_pack_objects)
 321                                 pid_pack_objects = 0;
 322                         if (pid_rev_list || pid_pack_objects)
 323                                 continue;
 324                 }
 325
 326                 /* both died happily */
 327                 if (pollsize)
 328                         continue;
 329
 330                 /* flush the data */
 331                 if (0 <= buffered) {
 332                         data[0] = buffered;
 333                         sz = send_client_data(1, data, 1);
 334                         if (sz < 0)
 335                                 goto fail;
 336                         fprintf(stderr, "flushed.\n");
 337                 }
 338                 if (use_sideband)
 339                         packet_flush(1);
 340                 return;
 341         }
 342  fail:
 343         if (pid_pack_objects)
 344                 kill(pid_pack_objects, SIGKILL);
 345         if (pid_rev_list)
 346                 kill(pid_rev_list, SIGKILL);
 347         send_client_data(3, abort_msg, sizeof(abort_msg));
 348         die("git-upload-pack: %s", abort_msg);
 349 }
 350
 351 static int got_sha1(char *hex, unsigned char *sha1)
 352 {
 353         struct object *o;
 354         int we_knew_they_have = 0;
 355
 356         if (get_sha1_hex(hex, sha1))
 357                 die("git-upload-pack: expected SHA1 object, got '%s'", hex);
 358         if (!has_sha1_file(sha1))
 359                 return -1;
 360
 361         o = lookup_object(sha1);
 362         if (!(o && o->parsed))
 363                 o = parse_object(sha1);
 364         if (!o)
 365                 die("oops (%s)", sha1_to_hex(sha1));
 366         if (o->type == OBJ_COMMIT) {
 367                 struct commit_list *parents;
 368                 struct commit *commit = (struct commit *)o;
 369                 if (o->flags & THEY_HAVE)
 370                         we_knew_they_have = 1;
 371                 else
 372                         o->flags |= THEY_HAVE;
 373                 if (!oldest_have || (commit->date < oldest_have))
 374                         oldest_have = commit->date;
 375                 for (parents = commit->parents;
 376                      parents;
 377                      parents = parents->next)
 378                         parents->item->object.flags |= THEY_HAVE;
 379         }
 380         if (!we_knew_they_have) {
 381                 add_object_array(o, NULL, &have_obj);
 382                 return 1;
 383         }
 384         return 0;
 385 }
 386
 387 static int reachable(struct commit *want)
 388 {
 389         struct commit_list *work = NULL;
 390
 391         insert_by_date(want, &work);
 392         while (work) {
 393                 struct commit_list *list = work->next;
 394                 struct commit *commit = work->item;
 395                 free(work);
 396                 work = list;
 397
 398                 if (commit->object.flags & THEY_HAVE) {
 399                         want->object.flags |= COMMON_KNOWN;
 400                         break;
 401                 }
 402                 if (!commit->object.parsed)
 403                         parse_object(commit->object.sha1);
 404                 if (commit->object.flags & REACHABLE)
 405                         continue;
 406                 commit->object.flags |= REACHABLE;
 407                 if (commit->date < oldest_have)
 408                         continue;
 409                 for (list = commit->parents; list; list = list->next) {
 410                         struct commit *parent = list->item;
 411                         if (!(parent->object.flags & REACHABLE))
 412                                 insert_by_date(parent, &work);
 413                 }
 414         }
 415         want->object.flags |= REACHABLE;
 416         clear_commit_marks(want, REACHABLE);
 417         free_commit_list(work);
 418         return (want->object.flags & COMMON_KNOWN);
 419 }
 420
 421 static int ok_to_give_up(void)
 422 {
 423         int i;
 424
 425         if (!have_obj.nr)
 426                 return 0;
 427
 428         for (i = 0; i < want_obj.nr; i++) {
 429                 struct object *want = want_obj.objects[i].item;
 430
 431                 if (want->flags & COMMON_KNOWN)
 432                         continue;
 433                 want = deref_tag(want, "a want line", 0);
 434                 if (!want || want->type != OBJ_COMMIT) {
 435                         /* no way to tell if this is reachable by
 436                          * looking at the ancestry chain alone, so
 437                          * leave a note to ourselves not to worry about
 438                          * this object anymore.
 439                          */
 440                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 441                         continue;
 442                 }
 443                 if (!reachable((struct commit *)want))
 444                         return 0;
 445         }
 446         return 1;
 447 }
 448
 449 static int get_common_commits(void)
 450 {
 451         static char line[1000];
 452         unsigned char sha1[20];
 453         char hex[41], last_hex[41];
 454         int len;
 455
 456         track_object_refs = 0;
 457         save_commit_buffer = 0;
 458
 459         for(;;) {
 460                 len = packet_read_line(0, line, sizeof(line));
 461                 reset_timeout();
 462
 463                 if (!len) {
 464                         if (have_obj.nr == 0 || multi_ack)
 465                                 packet_write(1, "NAK\n");
 466                         continue;
 467                 }
 468                 len = strip(line, len);
 469                 if (!prefixcmp(line, "have ")) {
 470                         switch (got_sha1(line+5, sha1)) {
 471                         case -1: /* they have what we do not */
 472                                 if (multi_ack && ok_to_give_up())
 473                                         packet_write(1, "ACK %s continue\n",
 474                                                      sha1_to_hex(sha1));
 475                                 break;
 476                         default:
 477                                 memcpy(hex, sha1_to_hex(sha1), 41);
 478                                 if (multi_ack) {
 479                                         const char *msg = "ACK %s continue\n";
 480                                         packet_write(1, msg, hex);
 481                                         memcpy(last_hex, hex, 41);
 482                                 }
 483                                 else if (have_obj.nr == 1)
 484                                         packet_write(1, "ACK %s\n", hex);
 485                                 break;
 486                         }
 487                         continue;
 488                 }
 489                 if (!strcmp(line, "done")) {
 490                         if (have_obj.nr > 0) {
 491                                 if (multi_ack)
 492                                         packet_write(1, "ACK %s\n", last_hex);
 493                                 return 0;
 494                         }
 495                         packet_write(1, "NAK\n");
 496                         return -1;
 497                 }
 498                 die("git-upload-pack: expected SHA1 list, got '%s'", line);
 499         }
 500 }
 501
 502 static void receive_needs(void)
 503 {
 504         struct object_array shallows = {0, 0, NULL};
 505         static char line[1000];
 506         int len, depth = 0;
 507
 508         for (;;) {
 509                 struct object *o;
 510                 unsigned char sha1_buf[20];
 511                 len = packet_read_line(0, line, sizeof(line));
 512                 reset_timeout();
 513                 if (!len)
 514                         break;
 515
 516                 if (!prefixcmp(line, "shallow ")) {
 517                         unsigned char sha1[20];
 518                         struct object *object;
 519                         use_thin_pack = 0;
 520                         if (get_sha1(line + 8, sha1))
 521                                 die("invalid shallow line: %s", line);
 522                         object = parse_object(sha1);
 523                         if (!object)
 524                                 die("did not find object for %s", line);
 525                         object->flags |= CLIENT_SHALLOW;
 526                         add_object_array(object, NULL, &shallows);
 527                         continue;
 528                 }
 529                 if (!prefixcmp(line, "deepen ")) {
 530                         char *end;
 531                         use_thin_pack = 0;
 532                         depth = strtol(line + 7, &end, 0);
 533                         if (end == line + 7 || depth <= 0)
 534                                 die("Invalid deepen: %s", line);
 535                         continue;
 536                 }
 537                 if (prefixcmp(line, "want ") ||
 538                     get_sha1_hex(line+5, sha1_buf))
 539                         die("git-upload-pack: protocol error, "
 540                             "expected to get sha, not '%s'", line);
 541                 if (strstr(line+45, "multi_ack"))
 542                         multi_ack = 1;
 543                 if (strstr(line+45, "thin-pack"))
 544                         use_thin_pack = 1;
 545                 if (strstr(line+45, "ofs-delta"))
 546                         use_ofs_delta = 1;
 547                 if (strstr(line+45, "side-band-64k"))
 548                         use_sideband = LARGE_PACKET_MAX;
 549                 else if (strstr(line+45, "side-band"))
 550                         use_sideband = DEFAULT_PACKET_MAX;
 551                 if (strstr(line+45, "no-progress"))
 552                         no_progress = 1;
 553
 554                 /* We have sent all our refs already, and the other end
 555                  * should have chosen out of them; otherwise they are
 556                  * asking for nonsense.
 557                  *
 558                  * Hmph.  We may later want to allow "want" line that
 559                  * asks for something like "master~10" (symbolic)...
 560                  * would it make sense?  I don't know.
 561                  */
 562                 o = lookup_object(sha1_buf);
 563                 if (!o || !(o->flags & OUR_REF))
 564                         die("git-upload-pack: not our ref %s", line+5);
 565                 if (!(o->flags & WANTED)) {
 566                         o->flags |= WANTED;
 567                         add_object_array(o, NULL, &want_obj);
 568                 }
 569         }
 570         if (depth == 0 && shallows.nr == 0)
 571                 return;
 572         if (depth > 0) {
 573                 struct commit_list *result, *backup;
 574                 int i;
 575                 backup = result = get_shallow_commits(&want_obj, depth,
 576                         SHALLOW, NOT_SHALLOW);
 577                 while (result) {
 578                         struct object *object = &result->item->object;
 579                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 580                                 packet_write(1, "shallow %s",
 581                                                 sha1_to_hex(object->sha1));
 582                                 register_shallow(object->sha1);
 583                         }
 584                         result = result->next;
 585                 }
 586                 free_commit_list(backup);
 587                 for (i = 0; i < shallows.nr; i++) {
 588                         struct object *object = shallows.objects[i].item;
 589                         if (object->flags & NOT_SHALLOW) {
 590                                 struct commit_list *parents;
 591                                 packet_write(1, "unshallow %s",
 592                                         sha1_to_hex(object->sha1));
 593                                 object->flags &= ~CLIENT_SHALLOW;
 594                                 /* make sure the real parents are parsed */
 595                                 unregister_shallow(object->sha1);
 596                                 object->parsed = 0;
 597                                 parse_commit((struct commit *)object);
 598                                 parents = ((struct commit *)object)->parents;
 599                                 while (parents) {
 600                                         add_object_array(&parents->item->object,
 601                                                         NULL, &want_obj);
 602                                         parents = parents->next;
 603                                 }
 604                         }
 605                         /* make sure commit traversal conforms to client */
 606                         register_shallow(object->sha1);
 607                 }
 608                 packet_flush(1);
 609         } else
 610                 if (shallows.nr > 0) {
 611                         int i;
 612                         for (i = 0; i < shallows.nr; i++)
 613                                 register_shallow(shallows.objects[i].item->sha1);
 614                 }
 615         free(shallows.objects);
 616 }
 617
 618 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 619 {
 620         static const char *capabilities = "multi_ack thin-pack side-band"
 621                 " side-band-64k ofs-delta shallow no-progress";
 622         struct object *o = parse_object(sha1);
 623
 624         if (!o)
 625                 die("git-upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 626
 627         if (capabilities)
 628                 packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
 629                         0, capabilities);
 630         else
 631                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
 632         capabilities = NULL;
 633         if (!(o->flags & OUR_REF)) {
 634                 o->flags |= OUR_REF;
 635                 nr_our_refs++;
 636         }
 637         if (o->type == OBJ_TAG) {
 638                 o = deref_tag(o, refname, 0);
 639                 packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
 640         }
 641         return 0;
 642 }
 643
 644 static void upload_pack(void)
 645 {
 646         reset_timeout();
 647         head_ref(send_ref, NULL);
 648         for_each_ref(send_ref, NULL);
 649         packet_flush(1);
 650         receive_needs();
 651         if (want_obj.nr) {
 652                 get_common_commits();
 653                 create_pack_file();
 654         }
 655 }
 656
 657 int main(int argc, char **argv)
 658 {
 659         char *dir;
 660         int i;
 661         int strict = 0;
 662
 663         for (i = 1; i < argc; i++) {
 664                 char *arg = argv[i];
 665
 666                 if (arg[0] != '-')
 667                         break;
 668                 if (!strcmp(arg, "--strict")) {
 669                         strict = 1;
 670                         continue;
 671                 }
 672                 if (!prefixcmp(arg, "--timeout=")) {
 673                         timeout = atoi(arg+10);
 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         dir = argv[i];
 685
 686         if (!enter_repo(dir, strict))
 687                 die("'%s': unable to chdir or not a git archive", dir);
 688         if (is_repository_shallow())
 689                 die("attempt to fetch/clone from a shallow repository");
 690         upload_pack();
 691         return 0;
 692 }