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;
  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 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 do_rev_list(void *create_full_pack)
 100 {
 101         int i;
 102         struct rev_info revs;
 103
 104         if (create_full_pack)
 105                 use_thin_pack = 0; /* no point doing it */
 106         init_revisions(&revs, NULL);
 107         revs.tag_objects = 1;
 108         revs.tree_objects = 1;
 109         revs.blob_objects = 1;
 110         if (use_thin_pack)
 111                 revs.edge_hint = 1;
 112
 113         if (create_full_pack) {
 114                 const char *args[] = {"rev-list", "--all", NULL};
 115                 setup_revisions(2, args, &revs, NULL);
 116         } else {
 117                 for (i = 0; i < want_obj.nr; i++) {
 118                         struct object *o = want_obj.objects[i].item;
 119                         /* why??? */
 120                         o->flags &= ~UNINTERESTING;
 121                         add_pending_object(&revs, o, NULL);
 122                 }
 123                 for (i = 0; i < have_obj.nr; i++) {
 124                         struct object *o = have_obj.objects[i].item;
 125                         o->flags |= UNINTERESTING;
 126                         add_pending_object(&revs, o, NULL);
 127                 }
 128                 setup_revisions(0, NULL, &revs, NULL);
 129         }
 130         prepare_revision_walk(&revs);
 131         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 132         traverse_commit_list(&revs, show_commit, show_object);
 133         fflush(pack_pipe);
 134         fclose(pack_pipe);
 135 }
 136
 137 static void create_pack_file(void)
 138 {
 139 #ifndef __MINGW32__
 140         /* Pipes between rev-list to pack-objects, pack-objects to us
 141          * and pack-objects error stream for progress bar.
 142          */
 143         int lp_pipe[2], pu_pipe[2], pe_pipe[2];
 144         pid_t pid_rev_list, pid_pack_objects;
 145         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
 146         char data[8193], progress[128];
 147         char abort_msg[] = "aborting due to possible repository "
 148                 "corruption on the remote side.";
 149         int buffered = -1;
 150
 151         if (pipe(lp_pipe) < 0)
 152                 die("git-upload-pack: unable to create pipe");
 153         pid_rev_list = fork();
 154         if (pid_rev_list < 0)
 155                 die("git-upload-pack: unable to fork git-rev-list");
 156
 157         if (!pid_rev_list) {
 158                 pack_pipe = fdopen(lp_pipe[1], "w");
 159                 do_rev_list(create_full_pack);
 160                 exit(0);
 161         }
 162
 163         if (pipe(pu_pipe) < 0)
 164                 die("git-upload-pack: unable to create pipe");
 165         if (pipe(pe_pipe) < 0)
 166                 die("git-upload-pack: unable to create pipe");
 167         pid_pack_objects = fork();
 168         if (pid_pack_objects < 0) {
 169                 /* daemon sets things up to ignore TERM */
 170                 kill(pid_rev_list, SIGKILL);
 171                 die("git-upload-pack: unable to fork git-pack-objects");
 172         }
 173         if (!pid_pack_objects) {
 174                 dup2(lp_pipe[0], 0);
 175                 dup2(pu_pipe[1], 1);
 176                 dup2(pe_pipe[1], 2);
 177
 178                 close(lp_pipe[0]);
 179                 close(lp_pipe[1]);
 180                 close(pu_pipe[0]);
 181                 close(pu_pipe[1]);
 182                 close(pe_pipe[0]);
 183                 close(pe_pipe[1]);
 184                 execl_git_cmd("pack-objects", "--stdout", "--progress",
 185                               use_ofs_delta ? "--delta-base-offset" : NULL,
 186                               NULL);
 187                 kill(pid_rev_list, SIGKILL);
 188                 die("git-upload-pack: unable to exec git-pack-objects");
 189         }
 190
 191         close(lp_pipe[0]);
 192         close(lp_pipe[1]);
 193
 194         /* We read from pe_pipe[0] to capture stderr output for
 195          * progress bar, and pu_pipe[0] to capture the pack data.
 196          */
 197         close(pe_pipe[1]);
 198         close(pu_pipe[1]);
 199
 200         while (1) {
 201                 const char *who;
 202                 struct pollfd pfd[2];
 203                 pid_t pid;
 204                 int status;
 205                 ssize_t sz;
 206                 int pe, pu, pollsize;
 207
 208                 reset_timeout();
 209
 210                 pollsize = 0;
 211                 pe = pu = -1;
 212
 213                 if (0 <= pu_pipe[0]) {
 214                         pfd[pollsize].fd = pu_pipe[0];
 215                         pfd[pollsize].events = POLLIN;
 216                         pu = pollsize;
 217                         pollsize++;
 218                 }
 219                 if (0 <= pe_pipe[0]) {
 220                         pfd[pollsize].fd = pe_pipe[0];
 221                         pfd[pollsize].events = POLLIN;
 222                         pe = pollsize;
 223                         pollsize++;
 224                 }
 225
 226                 if (pollsize) {
 227                         if (poll(pfd, pollsize, -1) < 0) {
 228                                 if (errno != EINTR) {
 229                                         error("poll failed, resuming: %s",
 230                                               strerror(errno));
 231                                         sleep(1);
 232                                 }
 233                                 continue;
 234                         }
 235                         if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 236                                 /* Data ready; we keep the last byte
 237                                  * to ourselves in case we detect
 238                                  * broken rev-list, so that we can
 239                                  * leave the stream corrupted.  This
 240                                  * is unfortunate -- unpack-objects
 241                                  * would happily accept a valid pack
 242                                  * data with trailing garbage, so
 243                                  * appending garbage after we pass all
 244                                  * the pack data is not good enough to
 245                                  * signal breakage to downstream.
 246                                  */
 247                                 char *cp = data;
 248                                 ssize_t outsz = 0;
 249                                 if (0 <= buffered) {
 250                                         *cp++ = buffered;
 251                                         outsz++;
 252                                 }
 253                                 sz = xread(pu_pipe[0], cp,
 254                                           sizeof(data) - outsz);
 255                                 if (0 < sz)
 256                                                 ;
 257                                 else if (sz == 0) {
 258                                         close(pu_pipe[0]);
 259                                         pu_pipe[0] = -1;
 260                                 }
 261                                 else
 262                                         goto fail;
 263                                 sz += outsz;
 264                                 if (1 < sz) {
 265                                         buffered = data[sz-1] & 0xFF;
 266                                         sz--;
 267                                 }
 268                                 else
 269                                         buffered = -1;
 270                                 sz = send_client_data(1, data, sz);
 271                                 if (sz < 0)
 272                                         goto fail;
 273                         }
 274                         if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 275                                 /* Status ready; we ship that in the side-band
 276                                  * or dump to the standard error.
 277                                  */
 278                                 sz = xread(pe_pipe[0], progress,
 279                                           sizeof(progress));
 280                                 if (0 < sz)
 281                                         send_client_data(2, progress, sz);
 282                                 else if (sz == 0) {
 283                                         close(pe_pipe[0]);
 284                                         pe_pipe[0] = -1;
 285                                 }
 286                                 else
 287                                         goto fail;
 288                         }
 289                 }
 290
 291                 /* See if the children are still there */
 292                 if (pid_rev_list || pid_pack_objects) {
 293                         pid = waitpid(-1, &status, WNOHANG);
 294                         if (!pid)
 295                                 continue;
 296                         who = ((pid == pid_rev_list) ? "git-rev-list" :
 297                                (pid == pid_pack_objects) ? "git-pack-objects" :
 298                                NULL);
 299                         if (!who) {
 300                                 if (pid < 0) {
 301                                         error("git-upload-pack: %s",
 302                                               strerror(errno));
 303                                         goto fail;
 304                                 }
 305                                 error("git-upload-pack: we weren't "
 306                                       "waiting for %d", pid);
 307                                 continue;
 308                         }
 309                         if (!WIFEXITED(status) || WEXITSTATUS(status) > 0) {
 310                                 error("git-upload-pack: %s died with error.",
 311                                       who);
 312                                 goto fail;
 313                         }
 314                         if (pid == pid_rev_list)
 315                                 pid_rev_list = 0;
 316                         if (pid == pid_pack_objects)
 317                                 pid_pack_objects = 0;
 318                         if (pid_rev_list || pid_pack_objects)
 319                                 continue;
 320                 }
 321
 322                 /* both died happily */
 323                 if (pollsize)
 324                         continue;
 325
 326                 /* flush the data */
 327                 if (0 <= buffered) {
 328                         data[0] = buffered;
 329                         sz = send_client_data(1, data, 1);
 330                         if (sz < 0)
 331                                 goto fail;
 332                         fprintf(stderr, "flushed.\n");
 333                 }
 334                 if (use_sideband)
 335                         packet_flush(1);
 336                 return;
 337         }
 338  fail:
 339         if (pid_pack_objects)
 340                 kill(pid_pack_objects, SIGKILL);
 341         if (pid_rev_list)
 342                 kill(pid_rev_list, SIGKILL);
 343         send_client_data(3, abort_msg, sizeof(abort_msg));
 344         die("git-upload-pack: %s", abort_msg);
 345 #else
 346         /* Pipes between rev-list to pack-objects, pack-objects to us. */
 347         int lp_pipe[2], pu_pipe[2];
 348         pid_t pid_pack_objects;
 349         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
 350         char data[8193];
 351         char abort_msg[] = "aborting due to possible repository "
 352                 "corruption on the remote side.";
 353         int buffered = -1;
 354         ssize_t sz;
 355         char *cp;
 356         const char* argv[] = { "pack-objects", "--stdout", "-q",
 357                       use_ofs_delta ? "--delta-base-offset" : NULL,
 358                       NULL };
 359
 360         if (pipe(lp_pipe) < 0)
 361                 die("git-upload-pack: unable to create pipe");
 362         pack_pipe = fdopen(lp_pipe[1], "w");
 363         if (_beginthread(do_rev_list, 0, create_full_pack ? &create_full_pack : NULL) < 0)
 364                 die("git-upload-pack: unable to run rev-list: %s", strerror(errno));
 365
 366         if (pipe(pu_pipe) < 0)
 367                 die("git-upload-pack: unable to create pipe");
 368
 369         pid_pack_objects = spawnv_git_cmd(argv, lp_pipe, pu_pipe);
 370         if (pid_pack_objects < 0)
 371                 die("git-upload-pack: unable to run git-pack-objects");
 372
 373         /* We read from pu_pipe[0] to capture the pack data. */
 374
 375         while ((sz = xread(pu_pipe[0], data+1, sizeof(data)-1)) > 0) {
 376                 cp = data+1;
 377                 /* Data ready; we keep the last byte to ourselves in case we
 378                  * detect broken rev-list, so that we can leave the stream
 379                  * corrupted.  This is unfortunate -- unpack-objects would
 380                  * happily accept a valid pack data with trailing garbage, so
 381                  * appending garbage after we pass all the pack data is not
 382                  * good enough to signal breakage to downstream.
 383                  */
 384                 if (0 <= buffered) {
 385                         *--cp = buffered;
 386                         sz++;
 387                 }
 388                 if (1 < sz) {
 389                         buffered = cp[sz-1] & 0xFF;
 390                         sz--;
 391                 }
 392                 else
 393                         buffered = -1;
 394                 sz = send_client_data(1, cp, sz);
 395                 if (sz < 0)
 396                         goto fail;
 397         }
 398         if (sz == 0) {
 399                 close(pu_pipe[0]);
 400                 pu_pipe[0] = -1;
 401         }
 402         else
 403                 goto fail;
 404
 405         /* flush the data */
 406         if (0 <= buffered) {
 407                 data[0] = buffered;
 408                 sz = send_client_data(1, data, 1);
 409                 if (sz < 0)
 410                         goto fail;
 411                 fprintf(stderr, "flushed.\n");
 412         }
 413         if (use_sideband)
 414                 packet_flush(1);
 415         if (waitpid(pid_pack_objects, NULL, 0) < 0)
 416                 die("git-upload-pack: waiting for pack-objects: %s",
 417                         strerror(errno));
 418         return;
 419
 420  fail:
 421         kill(pid_pack_objects, SIGKILL);
 422         send_client_data(3, abort_msg, sizeof(abort_msg));
 423         die("git-upload-pack: %s", abort_msg);
 424 #endif
 425 }
 426
 427 static int got_sha1(char *hex, unsigned char *sha1)
 428 {
 429         struct object *o;
 430         int we_knew_they_have = 0;
 431
 432         if (get_sha1_hex(hex, sha1))
 433                 die("git-upload-pack: expected SHA1 object, got '%s'", hex);
 434         if (!has_sha1_file(sha1))
 435                 return -1;
 436
 437         o = lookup_object(sha1);
 438         if (!(o && o->parsed))
 439                 o = parse_object(sha1);
 440         if (!o)
 441                 die("oops (%s)", sha1_to_hex(sha1));
 442         if (o->type == OBJ_COMMIT) {
 443                 struct commit_list *parents;
 444                 struct commit *commit = (struct commit *)o;
 445                 if (o->flags & THEY_HAVE)
 446                         we_knew_they_have = 1;
 447                 else
 448                         o->flags |= THEY_HAVE;
 449                 if (!oldest_have || (commit->date < oldest_have))
 450                         oldest_have = commit->date;
 451                 for (parents = commit->parents;
 452                      parents;
 453                      parents = parents->next)
 454                         parents->item->object.flags |= THEY_HAVE;
 455         }
 456         if (!we_knew_they_have) {
 457                 add_object_array(o, NULL, &have_obj);
 458                 return 1;
 459         }
 460         return 0;
 461 }
 462
 463 static int reachable(struct commit *want)
 464 {
 465         struct commit_list *work = NULL;
 466
 467         insert_by_date(want, &work);
 468         while (work) {
 469                 struct commit_list *list = work->next;
 470                 struct commit *commit = work->item;
 471                 free(work);
 472                 work = list;
 473
 474                 if (commit->object.flags & THEY_HAVE) {
 475                         want->object.flags |= COMMON_KNOWN;
 476                         break;
 477                 }
 478                 if (!commit->object.parsed)
 479                         parse_object(commit->object.sha1);
 480                 if (commit->object.flags & REACHABLE)
 481                         continue;
 482                 commit->object.flags |= REACHABLE;
 483                 if (commit->date < oldest_have)
 484                         continue;
 485                 for (list = commit->parents; list; list = list->next) {
 486                         struct commit *parent = list->item;
 487                         if (!(parent->object.flags & REACHABLE))
 488                                 insert_by_date(parent, &work);
 489                 }
 490         }
 491         want->object.flags |= REACHABLE;
 492         clear_commit_marks(want, REACHABLE);
 493         free_commit_list(work);
 494         return (want->object.flags & COMMON_KNOWN);
 495 }
 496
 497 static int ok_to_give_up(void)
 498 {
 499         int i;
 500
 501         if (!have_obj.nr)
 502                 return 0;
 503
 504         for (i = 0; i < want_obj.nr; i++) {
 505                 struct object *want = want_obj.objects[i].item;
 506
 507                 if (want->flags & COMMON_KNOWN)
 508                         continue;
 509                 want = deref_tag(want, "a want line", 0);
 510                 if (!want || want->type != OBJ_COMMIT) {
 511                         /* no way to tell if this is reachable by
 512                          * looking at the ancestry chain alone, so
 513                          * leave a note to ourselves not to worry about
 514                          * this object anymore.
 515                          */
 516                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 517                         continue;
 518                 }
 519                 if (!reachable((struct commit *)want))
 520                         return 0;
 521         }
 522         return 1;
 523 }
 524
 525 static int get_common_commits(void)
 526 {
 527         static char line[1000];
 528         unsigned char sha1[20];
 529         char hex[41], last_hex[41];
 530         int len;
 531
 532         track_object_refs = 0;
 533         save_commit_buffer = 0;
 534
 535         for(;;) {
 536                 len = packet_read_line(0, line, sizeof(line));
 537                 reset_timeout();
 538
 539                 if (!len) {
 540                         if (have_obj.nr == 0 || multi_ack)
 541                                 packet_write(1, "NAK\n");
 542                         continue;
 543                 }
 544                 len = strip(line, len);
 545                 if (!strncmp(line, "have ", 5)) {
 546                         switch (got_sha1(line+5, sha1)) {
 547                         case -1: /* they have what we do not */
 548                                 if (multi_ack && ok_to_give_up())
 549                                         packet_write(1, "ACK %s continue\n",
 550                                                      sha1_to_hex(sha1));
 551                                 break;
 552                         default:
 553                                 memcpy(hex, sha1_to_hex(sha1), 41);
 554                                 if (multi_ack) {
 555                                         const char *msg = "ACK %s continue\n";
 556                                         packet_write(1, msg, hex);
 557                                         memcpy(last_hex, hex, 41);
 558                                 }
 559                                 else if (have_obj.nr == 1)
 560                                         packet_write(1, "ACK %s\n", hex);
 561                                 break;
 562                         }
 563                         continue;
 564                 }
 565                 if (!strcmp(line, "done")) {
 566                         if (have_obj.nr > 0) {
 567                                 if (multi_ack)
 568                                         packet_write(1, "ACK %s\n", last_hex);
 569                                 return 0;
 570                         }
 571                         packet_write(1, "NAK\n");
 572                         return -1;
 573                 }
 574                 die("git-upload-pack: expected SHA1 list, got '%s'", line);
 575         }
 576 }
 577
 578 static void receive_needs(void)
 579 {
 580         struct object_array shallows = {0, 0, NULL};
 581         static char line[1000];
 582         int len, depth = 0;
 583
 584         for (;;) {
 585                 struct object *o;
 586                 unsigned char sha1_buf[20];
 587                 len = packet_read_line(0, line, sizeof(line));
 588                 reset_timeout();
 589                 if (!len)
 590                         break;
 591
 592                 if (!strncmp("shallow ", line, 8)) {
 593                         unsigned char sha1[20];
 594                         struct object *object;
 595                         use_thin_pack = 0;
 596                         if (get_sha1(line + 8, sha1))
 597                                 die("invalid shallow line: %s", line);
 598                         object = parse_object(sha1);
 599                         if (!object)
 600                                 die("did not find object for %s", line);
 601                         object->flags |= CLIENT_SHALLOW;
 602                         add_object_array(object, NULL, &shallows);
 603                         continue;
 604                 }
 605                 if (!strncmp("deepen ", line, 7)) {
 606                         char *end;
 607                         use_thin_pack = 0;
 608                         depth = strtol(line + 7, &end, 0);
 609                         if (end == line + 7 || depth <= 0)
 610                                 die("Invalid deepen: %s", line);
 611                         continue;
 612                 }
 613                 if (strncmp("want ", line, 5) ||
 614                     get_sha1_hex(line+5, sha1_buf))
 615                         die("git-upload-pack: protocol error, "
 616                             "expected to get sha, not '%s'", line);
 617                 if (strstr(line+45, "multi_ack"))
 618                         multi_ack = 1;
 619                 if (strstr(line+45, "thin-pack"))
 620                         use_thin_pack = 1;
 621                 if (strstr(line+45, "ofs-delta"))
 622                         use_ofs_delta = 1;
 623 #ifndef __MINGW32__
 624                 if (strstr(line+45, "side-band-64k"))
 625                         use_sideband = LARGE_PACKET_MAX;
 626                 else if (strstr(line+45, "side-band"))
 627                         use_sideband = DEFAULT_PACKET_MAX;
 628 #endif
 629
 630                 /* We have sent all our refs already, and the other end
 631                  * should have chosen out of them; otherwise they are
 632                  * asking for nonsense.
 633                  *
 634                  * Hmph.  We may later want to allow "want" line that
 635                  * asks for something like "master~10" (symbolic)...
 636                  * would it make sense?  I don't know.
 637                  */
 638                 o = lookup_object(sha1_buf);
 639                 if (!o || !(o->flags & OUR_REF))
 640                         die("git-upload-pack: not our ref %s", line+5);
 641                 if (!(o->flags & WANTED)) {
 642                         o->flags |= WANTED;
 643                         add_object_array(o, NULL, &want_obj);
 644                 }
 645         }
 646         if (depth == 0 && shallows.nr == 0)
 647                 return;
 648         if (depth > 0) {
 649                 struct commit_list *result, *backup;
 650                 int i;
 651                 backup = result = get_shallow_commits(&want_obj, depth,
 652                         SHALLOW, NOT_SHALLOW);
 653                 while (result) {
 654                         struct object *object = &result->item->object;
 655                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 656                                 packet_write(1, "shallow %s",
 657                                                 sha1_to_hex(object->sha1));
 658                                 register_shallow(object->sha1);
 659                         }
 660                         result = result->next;
 661                 }
 662                 free_commit_list(backup);
 663                 for (i = 0; i < shallows.nr; i++) {
 664                         struct object *object = shallows.objects[i].item;
 665                         if (object->flags & NOT_SHALLOW) {
 666                                 struct commit_list *parents;
 667                                 packet_write(1, "unshallow %s",
 668                                         sha1_to_hex(object->sha1));
 669                                 object->flags &= ~CLIENT_SHALLOW;
 670                                 /* make sure the real parents are parsed */
 671                                 unregister_shallow(object->sha1);
 672                                 object->parsed = 0;
 673                                 parse_commit((struct commit *)object);
 674                                 parents = ((struct commit *)object)->parents;
 675                                 while (parents) {
 676                                         add_object_array(&parents->item->object,
 677                                                         NULL, &want_obj);
 678                                         parents = parents->next;
 679                                 }
 680                         }
 681                         /* make sure commit traversal conforms to client */
 682                         register_shallow(object->sha1);
 683                 }
 684                 packet_flush(1);
 685         } else
 686                 if (shallows.nr > 0) {
 687                         int i;
 688                         for (i = 0; i < shallows.nr; i++)
 689                                 register_shallow(shallows.objects[i].item->sha1);
 690                 }
 691         free(shallows.objects);
 692 }
 693
 694 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 695 {
 696         static const char *capabilities = "multi_ack thin-pack side-band"
 697                 " side-band-64k ofs-delta shallow";
 698         struct object *o = parse_object(sha1);
 699
 700         if (!o)
 701                 die("git-upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 702
 703         if (capabilities)
 704                 packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
 705                         0, capabilities);
 706         else
 707                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
 708         capabilities = NULL;
 709         if (!(o->flags & OUR_REF)) {
 710                 o->flags |= OUR_REF;
 711                 nr_our_refs++;
 712         }
 713         if (o->type == OBJ_TAG) {
 714                 o = deref_tag(o, refname, 0);
 715                 packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
 716         }
 717         return 0;
 718 }
 719
 720 static void upload_pack(void)
 721 {
 722         reset_timeout();
 723         head_ref(send_ref, NULL);
 724         for_each_ref(send_ref, NULL);
 725         packet_flush(1);
 726         receive_needs();
 727         if (want_obj.nr) {
 728                 get_common_commits();
 729                 create_pack_file();
 730         }
 731 }
 732
 733 int main(int argc, char **argv)
 734 {
 735         char *dir;
 736         int i;
 737         int strict = 0;
 738
 739         for (i = 1; i < argc; i++) {
 740                 char *arg = argv[i];
 741
 742                 if (arg[0] != '-')
 743                         break;
 744                 if (!strcmp(arg, "--strict")) {
 745                         strict = 1;
 746                         continue;
 747                 }
 748                 if (!strncmp(arg, "--timeout=", 10)) {
 749                         timeout = atoi(arg+10);
 750                         continue;
 751                 }
 752                 if (!strcmp(arg, "--")) {
 753                         i++;
 754                         break;
 755                 }
 756         }
 757
 758         if (i != argc-1)
 759                 usage(upload_pack_usage);
 760         dir = argv[i];
 761
 762         if (!enter_repo(dir, strict))
 763                 die("'%s': unable to chdir or not a git archive", dir);
 764         if (is_repository_shallow())
 765                 die("attempt to fetch/clone from a shallow repository");
 766         upload_pack();
 767         return 0;
 768 }