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 #include "sigchain.h"
  14
  15 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  16
  17 /* bits #0..7 in revision.h, #8..10 in commit.c */
  18 #define THEY_HAVE       (1u << 11)
  19 #define OUR_REF         (1u << 12)
  20 #define WANTED          (1u << 13)
  21 #define COMMON_KNOWN    (1u << 14)
  22 #define REACHABLE       (1u << 15)
  23
  24 #define SHALLOW         (1u << 16)
  25 #define NOT_SHALLOW     (1u << 17)
  26 #define CLIENT_SHALLOW  (1u << 18)
  27
  28 static unsigned long oldest_have;
  29
  30 static int multi_ack, nr_our_refs;
  31 static int no_done;
  32 static int use_thin_pack, use_ofs_delta, use_include_tag;
  33 static int no_progress, daemon_mode;
  34 static int shallow_nr;
  35 static struct object_array have_obj;
  36 static struct object_array want_obj;
  37 static struct object_array extra_edge_obj;
  38 static unsigned int timeout;
  39 /* 0 for no sideband,
  40  * otherwise maximum packet size (up to 65520 bytes).
  41  */
  42 static int use_sideband;
  43 static int debug_fd;
  44 static int advertise_refs;
  45 static int stateless_rpc;
  46
  47 static void reset_timeout(void)
  48 {
  49         alarm(timeout);
  50 }
  51
  52 static int strip(char *line, int len)
  53 {
  54         if (len && line[len-1] == '\n')
  55                 line[--len] = 0;
  56         return len;
  57 }
  58
  59 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  60 {
  61         if (use_sideband)
  62                 return send_sideband(1, fd, data, sz, use_sideband);
  63         if (fd == 3)
  64                 /* emergency quit */
  65                 fd = 2;
  66         if (fd == 2) {
  67                 /* XXX: are we happy to lose stuff here? */
  68                 xwrite(fd, data, sz);
  69                 return sz;
  70         }
  71         return safe_write(fd, data, sz);
  72 }
  73
  74 static FILE *pack_pipe = NULL;
  75 static void show_commit(struct commit *commit, void *data)
  76 {
  77         if (commit->object.flags & BOUNDARY)
  78                 fputc('-', pack_pipe);
  79         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
  80                 die("broken output pipe");
  81         fputc('\n', pack_pipe);
  82         fflush(pack_pipe);
  83         free(commit->buffer);
  84         commit->buffer = NULL;
  85 }
  86
  87 static void show_object(struct object *obj,
  88                         const struct name_path *path, const char *component,
  89                         void *cb_data)
  90 {
  91         show_object_with_name(pack_pipe, obj, path, component);
  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 int do_rev_list(int in, int out, void *user_data)
 100 {
 101         int i;
 102         struct rev_info revs;
 103
 104         pack_pipe = xfdopen(out, "w");
 105         init_revisions(&revs, NULL);
 106         revs.tag_objects = 1;
 107         revs.tree_objects = 1;
 108         revs.blob_objects = 1;
 109         if (use_thin_pack)
 110                 revs.edge_hint = 1;
 111
 112         for (i = 0; i < want_obj.nr; i++) {
 113                 struct object *o = want_obj.objects[i].item;
 114                 /* why??? */
 115                 o->flags &= ~UNINTERESTING;
 116                 add_pending_object(&revs, o, NULL);
 117         }
 118         for (i = 0; i < have_obj.nr; i++) {
 119                 struct object *o = have_obj.objects[i].item;
 120                 o->flags |= UNINTERESTING;
 121                 add_pending_object(&revs, o, NULL);
 122         }
 123         setup_revisions(0, NULL, &revs, NULL);
 124         if (prepare_revision_walk(&revs))
 125                 die("revision walk setup failed");
 126         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 127         if (use_thin_pack)
 128                 for (i = 0; i < extra_edge_obj.nr; i++)
 129                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
 130                                         extra_edge_obj.objects[i].item->sha1));
 131         traverse_commit_list(&revs, show_commit, show_object, NULL);
 132         fflush(pack_pipe);
 133         fclose(pack_pipe);
 134         return 0;
 135 }
 136
 137 static void create_pack_file(void)
 138 {
 139         struct async rev_list;
 140         struct child_process pack_objects;
 141         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
 142         char data[8193], progress[128];
 143         char abort_msg[] = "aborting due to possible repository "
 144                 "corruption on the remote side.";
 145         int buffered = -1;
 146         ssize_t sz;
 147         const char *argv[10];
 148         int arg = 0;
 149
 150         argv[arg++] = "pack-objects";
 151         if (!shallow_nr) {
 152                 argv[arg++] = "--revs";
 153                 if (create_full_pack)
 154                         argv[arg++] = "--all";
 155                 else if (use_thin_pack)
 156                         argv[arg++] = "--thin";
 157         }
 158
 159         argv[arg++] = "--stdout";
 160         if (!no_progress)
 161                 argv[arg++] = "--progress";
 162         if (use_ofs_delta)
 163                 argv[arg++] = "--delta-base-offset";
 164         if (use_include_tag)
 165                 argv[arg++] = "--include-tag";
 166         argv[arg++] = NULL;
 167
 168         memset(&pack_objects, 0, sizeof(pack_objects));
 169         pack_objects.in = -1;
 170         pack_objects.out = -1;
 171         pack_objects.err = -1;
 172         pack_objects.git_cmd = 1;
 173         pack_objects.argv = argv;
 174
 175         if (start_command(&pack_objects))
 176                 die("git upload-pack: unable to fork git-pack-objects");
 177
 178         if (shallow_nr) {
 179                 memset(&rev_list, 0, sizeof(rev_list));
 180                 rev_list.proc = do_rev_list;
 181                 rev_list.out = pack_objects.in;
 182                 if (start_async(&rev_list))
 183                         die("git upload-pack: unable to fork git-rev-list");
 184         }
 185         else {
 186                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
 187                 if (!create_full_pack) {
 188                         int i;
 189                         for (i = 0; i < want_obj.nr; i++)
 190                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(want_obj.objects[i].item->sha1));
 191                         fprintf(pipe_fd, "--not\n");
 192                         for (i = 0; i < have_obj.nr; i++)
 193                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(have_obj.objects[i].item->sha1));
 194                 }
 195
 196                 fprintf(pipe_fd, "\n");
 197                 fflush(pipe_fd);
 198                 fclose(pipe_fd);
 199         }
 200
 201
 202         /* We read from pack_objects.err to capture stderr output for
 203          * progress bar, and pack_objects.out to capture the pack data.
 204          */
 205
 206         while (1) {
 207                 struct pollfd pfd[2];
 208                 int pe, pu, pollsize;
 209
 210                 reset_timeout();
 211
 212                 pollsize = 0;
 213                 pe = pu = -1;
 214
 215                 if (0 <= pack_objects.out) {
 216                         pfd[pollsize].fd = pack_objects.out;
 217                         pfd[pollsize].events = POLLIN;
 218                         pu = pollsize;
 219                         pollsize++;
 220                 }
 221                 if (0 <= pack_objects.err) {
 222                         pfd[pollsize].fd = pack_objects.err;
 223                         pfd[pollsize].events = POLLIN;
 224                         pe = pollsize;
 225                         pollsize++;
 226                 }
 227
 228                 if (!pollsize)
 229                         break;
 230
 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 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 240                         /* Status ready; we ship that in the side-band
 241                          * or dump to the standard error.
 242                          */
 243                         sz = xread(pack_objects.err, progress,
 244                                   sizeof(progress));
 245                         if (0 < sz)
 246                                 send_client_data(2, progress, sz);
 247                         else if (sz == 0) {
 248                                 close(pack_objects.err);
 249                                 pack_objects.err = -1;
 250                         }
 251                         else
 252                                 goto fail;
 253                         /* give priority to status messages */
 254                         continue;
 255                 }
 256                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 257                         /* Data ready; we keep the last byte to ourselves
 258                          * in case we detect broken rev-list, so that we
 259                          * can leave the stream corrupted.  This is
 260                          * unfortunate -- unpack-objects would happily
 261                          * accept a valid packdata with trailing garbage,
 262                          * so appending garbage after we pass all the
 263                          * pack data is not good enough to signal
 264                          * breakage to downstream.
 265                          */
 266                         char *cp = data;
 267                         ssize_t outsz = 0;
 268                         if (0 <= buffered) {
 269                                 *cp++ = buffered;
 270                                 outsz++;
 271                         }
 272                         sz = xread(pack_objects.out, cp,
 273                                   sizeof(data) - outsz);
 274                         if (0 < sz)
 275                                 ;
 276                         else if (sz == 0) {
 277                                 close(pack_objects.out);
 278                                 pack_objects.out = -1;
 279                         }
 280                         else
 281                                 goto fail;
 282                         sz += outsz;
 283                         if (1 < sz) {
 284                                 buffered = data[sz-1] & 0xFF;
 285                                 sz--;
 286                         }
 287                         else
 288                                 buffered = -1;
 289                         sz = send_client_data(1, data, sz);
 290                         if (sz < 0)
 291                                 goto fail;
 292                 }
 293         }
 294
 295         if (finish_command(&pack_objects)) {
 296                 error("git upload-pack: git-pack-objects died with error.");
 297                 goto fail;
 298         }
 299         if (shallow_nr && finish_async(&rev_list))
 300                 goto fail;      /* error was already reported */
 301
 302         /* flush the data */
 303         if (0 <= buffered) {
 304                 data[0] = buffered;
 305                 sz = send_client_data(1, data, 1);
 306                 if (sz < 0)
 307                         goto fail;
 308                 fprintf(stderr, "flushed.\n");
 309         }
 310         if (use_sideband)
 311                 packet_flush(1);
 312         return;
 313
 314  fail:
 315         send_client_data(3, abort_msg, sizeof(abort_msg));
 316         die("git upload-pack: %s", abort_msg);
 317 }
 318
 319 static int got_sha1(char *hex, unsigned char *sha1)
 320 {
 321         struct object *o;
 322         int we_knew_they_have = 0;
 323
 324         if (get_sha1_hex(hex, sha1))
 325                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 326         if (!has_sha1_file(sha1))
 327                 return -1;
 328
 329         o = lookup_object(sha1);
 330         if (!(o && o->parsed))
 331                 o = parse_object(sha1);
 332         if (!o)
 333                 die("oops (%s)", sha1_to_hex(sha1));
 334         if (o->type == OBJ_COMMIT) {
 335                 struct commit_list *parents;
 336                 struct commit *commit = (struct commit *)o;
 337                 if (o->flags & THEY_HAVE)
 338                         we_knew_they_have = 1;
 339                 else
 340                         o->flags |= THEY_HAVE;
 341                 if (!oldest_have || (commit->date < oldest_have))
 342                         oldest_have = commit->date;
 343                 for (parents = commit->parents;
 344                      parents;
 345                      parents = parents->next)
 346                         parents->item->object.flags |= THEY_HAVE;
 347         }
 348         if (!we_knew_they_have) {
 349                 add_object_array(o, NULL, &have_obj);
 350                 return 1;
 351         }
 352         return 0;
 353 }
 354
 355 static int reachable(struct commit *want)
 356 {
 357         struct commit_list *work = NULL;
 358
 359         commit_list_insert_by_date(want, &work);
 360         while (work) {
 361                 struct commit_list *list = work->next;
 362                 struct commit *commit = work->item;
 363                 free(work);
 364                 work = list;
 365
 366                 if (commit->object.flags & THEY_HAVE) {
 367                         want->object.flags |= COMMON_KNOWN;
 368                         break;
 369                 }
 370                 if (!commit->object.parsed)
 371                         parse_object(commit->object.sha1);
 372                 if (commit->object.flags & REACHABLE)
 373                         continue;
 374                 commit->object.flags |= REACHABLE;
 375                 if (commit->date < oldest_have)
 376                         continue;
 377                 for (list = commit->parents; list; list = list->next) {
 378                         struct commit *parent = list->item;
 379                         if (!(parent->object.flags & REACHABLE))
 380                                 commit_list_insert_by_date(parent, &work);
 381                 }
 382         }
 383         want->object.flags |= REACHABLE;
 384         clear_commit_marks(want, REACHABLE);
 385         free_commit_list(work);
 386         return (want->object.flags & COMMON_KNOWN);
 387 }
 388
 389 static int ok_to_give_up(void)
 390 {
 391         int i;
 392
 393         if (!have_obj.nr)
 394                 return 0;
 395
 396         for (i = 0; i < want_obj.nr; i++) {
 397                 struct object *want = want_obj.objects[i].item;
 398
 399                 if (want->flags & COMMON_KNOWN)
 400                         continue;
 401                 want = deref_tag(want, "a want line", 0);
 402                 if (!want || want->type != OBJ_COMMIT) {
 403                         /* no way to tell if this is reachable by
 404                          * looking at the ancestry chain alone, so
 405                          * leave a note to ourselves not to worry about
 406                          * this object anymore.
 407                          */
 408                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 409                         continue;
 410                 }
 411                 if (!reachable((struct commit *)want))
 412                         return 0;
 413         }
 414         return 1;
 415 }
 416
 417 static int get_common_commits(void)
 418 {
 419         static char line[1000];
 420         unsigned char sha1[20];
 421         char last_hex[41];
 422         int got_common = 0;
 423         int got_other = 0;
 424         int sent_ready = 0;
 425
 426         save_commit_buffer = 0;
 427
 428         for (;;) {
 429                 int len = packet_read_line(0, line, sizeof(line));
 430                 reset_timeout();
 431
 432                 if (!len) {
 433                         if (multi_ack == 2 && got_common
 434                             && !got_other && ok_to_give_up()) {
 435                                 sent_ready = 1;
 436                                 packet_write(1, "ACK %s ready\n", last_hex);
 437                         }
 438                         if (have_obj.nr == 0 || multi_ack)
 439                                 packet_write(1, "NAK\n");
 440
 441                         if (no_done && sent_ready) {
 442                                 packet_write(1, "ACK %s\n", last_hex);
 443                                 return 0;
 444                         }
 445                         if (stateless_rpc)
 446                                 exit(0);
 447                         got_common = 0;
 448                         got_other = 0;
 449                         continue;
 450                 }
 451                 strip(line, len);
 452                 if (!prefixcmp(line, "have ")) {
 453                         switch (got_sha1(line+5, sha1)) {
 454                         case -1: /* they have what we do not */
 455                                 got_other = 1;
 456                                 if (multi_ack && ok_to_give_up()) {
 457                                         const char *hex = sha1_to_hex(sha1);
 458                                         if (multi_ack == 2) {
 459                                                 sent_ready = 1;
 460                                                 packet_write(1, "ACK %s ready\n", hex);
 461                                         } else
 462                                                 packet_write(1, "ACK %s continue\n", hex);
 463                                 }
 464                                 break;
 465                         default:
 466                                 got_common = 1;
 467                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 468                                 if (multi_ack == 2)
 469                                         packet_write(1, "ACK %s common\n", last_hex);
 470                                 else if (multi_ack)
 471                                         packet_write(1, "ACK %s continue\n", last_hex);
 472                                 else if (have_obj.nr == 1)
 473                                         packet_write(1, "ACK %s\n", last_hex);
 474                                 break;
 475                         }
 476                         continue;
 477                 }
 478                 if (!strcmp(line, "done")) {
 479                         if (have_obj.nr > 0) {
 480                                 if (multi_ack)
 481                                         packet_write(1, "ACK %s\n", last_hex);
 482                                 return 0;
 483                         }
 484                         packet_write(1, "NAK\n");
 485                         return -1;
 486                 }
 487                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 488         }
 489 }
 490
 491 static void check_non_tip(void)
 492 {
 493         static const char *argv[] = {
 494                 "rev-list", "--stdin", NULL,
 495         };
 496         static struct child_process cmd;
 497         struct object *o;
 498         char namebuf[42]; /* ^ + SHA-1 + LF */
 499         int i;
 500
 501         /* In the normal in-process case non-tip request can never happen */
 502         if (!stateless_rpc)
 503                 goto error;
 504
 505         cmd.argv = argv;
 506         cmd.git_cmd = 1;
 507         cmd.no_stderr = 1;
 508         cmd.in = -1;
 509         cmd.out = -1;
 510
 511         if (start_command(&cmd))
 512                 goto error;
 513
 514         /*
 515          * If rev-list --stdin encounters an unknown commit, it
 516          * terminates, which will cause SIGPIPE in the write loop
 517          * below.
 518          */
 519         sigchain_push(SIGPIPE, SIG_IGN);
 520
 521         namebuf[0] = '^';
 522         namebuf[41] = '\n';
 523         for (i = get_max_object_index(); 0 < i; ) {
 524                 o = get_indexed_object(--i);
 525                 if (!o)
 526                         continue;
 527                 if (!(o->flags & OUR_REF))
 528                         continue;
 529                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 530                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 531                         goto error;
 532         }
 533         namebuf[40] = '\n';
 534         for (i = 0; i < want_obj.nr; i++) {
 535                 o = want_obj.objects[i].item;
 536                 if (o->flags & OUR_REF)
 537                         continue;
 538                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 539                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 540                         goto error;
 541         }
 542         close(cmd.in);
 543
 544         sigchain_pop(SIGPIPE);
 545
 546         /*
 547          * The commits out of the rev-list are not ancestors of
 548          * our ref.
 549          */
 550         i = read_in_full(cmd.out, namebuf, 1);
 551         if (i)
 552                 goto error;
 553         close(cmd.out);
 554
 555         /*
 556          * rev-list may have died by encountering a bad commit
 557          * in the history, in which case we do want to bail out
 558          * even when it showed no commit.
 559          */
 560         if (finish_command(&cmd))
 561                 goto error;
 562
 563         /* All the non-tip ones are ancestors of what we advertised */
 564         return;
 565
 566 error:
 567         /* Pick one of them (we know there at least is one) */
 568         for (i = 0; i < want_obj.nr; i++) {
 569                 o = want_obj.objects[i].item;
 570                 if (!(o->flags & OUR_REF))
 571                         die("git upload-pack: not our ref %s",
 572                             sha1_to_hex(o->sha1));
 573         }
 574 }
 575
 576 static void receive_needs(void)
 577 {
 578         struct object_array shallows = OBJECT_ARRAY_INIT;
 579         static char line[1000];
 580         int len, depth = 0;
 581         int has_non_tip = 0;
 582
 583         shallow_nr = 0;
 584         if (debug_fd)
 585                 write_str_in_full(debug_fd, "#S\n");
 586         for (;;) {
 587                 struct object *o;
 588                 unsigned char sha1_buf[20];
 589                 len = packet_read_line(0, line, sizeof(line));
 590                 reset_timeout();
 591                 if (!len)
 592                         break;
 593                 if (debug_fd)
 594                         write_in_full(debug_fd, line, len);
 595
 596                 if (!prefixcmp(line, "shallow ")) {
 597                         unsigned char sha1[20];
 598                         struct object *object;
 599                         if (get_sha1(line + 8, sha1))
 600                                 die("invalid shallow line: %s", line);
 601                         object = parse_object(sha1);
 602                         if (!object)
 603                                 die("did not find object for %s", line);
 604                         object->flags |= CLIENT_SHALLOW;
 605                         add_object_array(object, NULL, &shallows);
 606                         continue;
 607                 }
 608                 if (!prefixcmp(line, "deepen ")) {
 609                         char *end;
 610                         depth = strtol(line + 7, &end, 0);
 611                         if (end == line + 7 || depth <= 0)
 612                                 die("Invalid deepen: %s", line);
 613                         continue;
 614                 }
 615                 if (prefixcmp(line, "want ") ||
 616                     get_sha1_hex(line+5, sha1_buf))
 617                         die("git upload-pack: protocol error, "
 618                             "expected to get sha, not '%s'", line);
 619                 if (strstr(line+45, "multi_ack_detailed"))
 620                         multi_ack = 2;
 621                 else if (strstr(line+45, "multi_ack"))
 622                         multi_ack = 1;
 623                 if (strstr(line+45, "no-done"))
 624                         no_done = 1;
 625                 if (strstr(line+45, "thin-pack"))
 626                         use_thin_pack = 1;
 627                 if (strstr(line+45, "ofs-delta"))
 628                         use_ofs_delta = 1;
 629                 if (strstr(line+45, "side-band-64k"))
 630                         use_sideband = LARGE_PACKET_MAX;
 631                 else if (strstr(line+45, "side-band"))
 632                         use_sideband = DEFAULT_PACKET_MAX;
 633                 if (strstr(line+45, "no-progress"))
 634                         no_progress = 1;
 635                 if (strstr(line+45, "include-tag"))
 636                         use_include_tag = 1;
 637
 638                 o = lookup_object(sha1_buf);
 639                 if (!o)
 640                         die("git upload-pack: not our ref %s",
 641                             sha1_to_hex(sha1_buf));
 642                 if (!(o->flags & WANTED)) {
 643                         o->flags |= WANTED;
 644                         if (!(o->flags & OUR_REF))
 645                                 has_non_tip = 1;
 646                         add_object_array(o, NULL, &want_obj);
 647                 }
 648         }
 649         if (debug_fd)
 650                 write_str_in_full(debug_fd, "#E\n");
 651
 652         /*
 653          * We have sent all our refs already, and the other end
 654          * should have chosen out of them. When we are operating
 655          * in the stateless RPC mode, however, their choice may
 656          * have been based on the set of older refs advertised
 657          * by another process that handled the initial request.
 658          */
 659         if (has_non_tip)
 660                 check_non_tip();
 661
 662         if (!use_sideband && daemon_mode)
 663                 no_progress = 1;
 664
 665         if (depth == 0 && shallows.nr == 0)
 666                 return;
 667         if (depth > 0) {
 668                 struct commit_list *result, *backup;
 669                 int i;
 670                 backup = result = get_shallow_commits(&want_obj, depth,
 671                         SHALLOW, NOT_SHALLOW);
 672                 while (result) {
 673                         struct object *object = &result->item->object;
 674                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 675                                 packet_write(1, "shallow %s",
 676                                                 sha1_to_hex(object->sha1));
 677                                 register_shallow(object->sha1);
 678                                 shallow_nr++;
 679                         }
 680                         result = result->next;
 681                 }
 682                 free_commit_list(backup);
 683                 for (i = 0; i < shallows.nr; i++) {
 684                         struct object *object = shallows.objects[i].item;
 685                         if (object->flags & NOT_SHALLOW) {
 686                                 struct commit_list *parents;
 687                                 packet_write(1, "unshallow %s",
 688                                         sha1_to_hex(object->sha1));
 689                                 object->flags &= ~CLIENT_SHALLOW;
 690                                 /* make sure the real parents are parsed */
 691                                 unregister_shallow(object->sha1);
 692                                 object->parsed = 0;
 693                                 if (parse_commit((struct commit *)object))
 694                                         die("invalid commit");
 695                                 parents = ((struct commit *)object)->parents;
 696                                 while (parents) {
 697                                         add_object_array(&parents->item->object,
 698                                                         NULL, &want_obj);
 699                                         parents = parents->next;
 700                                 }
 701                                 add_object_array(object, NULL, &extra_edge_obj);
 702                         }
 703                         /* make sure commit traversal conforms to client */
 704                         register_shallow(object->sha1);
 705                 }
 706                 packet_flush(1);
 707         } else
 708                 if (shallows.nr > 0) {
 709                         int i;
 710                         for (i = 0; i < shallows.nr; i++)
 711                                 register_shallow(shallows.objects[i].item->sha1);
 712                 }
 713
 714         shallow_nr += shallows.nr;
 715         free(shallows.objects);
 716 }
 717
 718 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 719 {
 720         static const char *capabilities = "multi_ack thin-pack side-band"
 721                 " side-band-64k ofs-delta shallow no-progress"
 722                 " include-tag multi_ack_detailed";
 723         struct object *o = parse_object(sha1);
 724         const char *refname_nons = strip_namespace(refname);
 725
 726         if (!o)
 727                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 728
 729         if (capabilities)
 730                 packet_write(1, "%s %s%c%s%s\n", sha1_to_hex(sha1), refname_nons,
 731                              0, capabilities,
 732                              stateless_rpc ? " no-done" : "");
 733         else
 734                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 735         capabilities = NULL;
 736         if (!(o->flags & OUR_REF)) {
 737                 o->flags |= OUR_REF;
 738                 nr_our_refs++;
 739         }
 740         if (o->type == OBJ_TAG) {
 741                 o = deref_tag(o, refname, 0);
 742                 if (o)
 743                         packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname_nons);
 744         }
 745         return 0;
 746 }
 747
 748 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 749 {
 750         struct object *o = parse_object(sha1);
 751         if (!o)
 752                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 753         if (!(o->flags & OUR_REF)) {
 754                 o->flags |= OUR_REF;
 755                 nr_our_refs++;
 756         }
 757         return 0;
 758 }
 759
 760 static void upload_pack(void)
 761 {
 762         if (advertise_refs || !stateless_rpc) {
 763                 reset_timeout();
 764                 head_ref_namespaced(send_ref, NULL);
 765                 for_each_namespaced_ref(send_ref, NULL);
 766                 packet_flush(1);
 767         } else {
 768                 head_ref_namespaced(mark_our_ref, NULL);
 769                 for_each_namespaced_ref(mark_our_ref, NULL);
 770         }
 771         if (advertise_refs)
 772                 return;
 773
 774         receive_needs();
 775         if (want_obj.nr) {
 776                 get_common_commits();
 777                 create_pack_file();
 778         }
 779 }
 780
 781 int main(int argc, char **argv)
 782 {
 783         char *dir;
 784         int i;
 785         int strict = 0;
 786
 787         packet_trace_identity("upload-pack");
 788         git_extract_argv0_path(argv[0]);
 789         read_replace_refs = 0;
 790
 791         for (i = 1; i < argc; i++) {
 792                 char *arg = argv[i];
 793
 794                 if (arg[0] != '-')
 795                         break;
 796                 if (!strcmp(arg, "--advertise-refs")) {
 797                         advertise_refs = 1;
 798                         continue;
 799                 }
 800                 if (!strcmp(arg, "--stateless-rpc")) {
 801                         stateless_rpc = 1;
 802                         continue;
 803                 }
 804                 if (!strcmp(arg, "--strict")) {
 805                         strict = 1;
 806                         continue;
 807                 }
 808                 if (!prefixcmp(arg, "--timeout=")) {
 809                         timeout = atoi(arg+10);
 810                         daemon_mode = 1;
 811                         continue;
 812                 }
 813                 if (!strcmp(arg, "--")) {
 814                         i++;
 815                         break;
 816                 }
 817         }
 818
 819         if (i != argc-1)
 820                 usage(upload_pack_usage);
 821
 822         setup_path();
 823
 824         dir = argv[i];
 825
 826         if (!enter_repo(dir, strict))
 827                 die("'%s' does not appear to be a git repository", dir);
 828         if (is_repository_shallow())
 829                 die("attempt to fetch/clone from a shallow repository");
 830         if (getenv("GIT_DEBUG_SEND_PACK"))
 831                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
 832         upload_pack();
 833         return 0;
 834 }