git.oblomov.eu Git - git/blob - upload-pack.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "pkt-line.h"
   4 #include "sideband.h"
   5 #include "tag.h"
   6 #include "object.h"
   7 #include "commit.h"
   8 #include "exec_cmd.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "list-objects.h"
  12 #include "run-command.h"
  13 #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, const struct name_path *path, const char *component)
  88 {
  89         show_object_with_name(pack_pipe, obj, path, component);
  90 }
  91
  92 static void show_edge(struct commit *commit)
  93 {
  94         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
  95 }
  96
  97 static int do_rev_list(int in, int out, void *user_data)
  98 {
  99         int i;
 100         struct rev_info revs;
 101
 102         pack_pipe = xfdopen(out, "w");
 103         init_revisions(&revs, NULL);
 104         revs.tag_objects = 1;
 105         revs.tree_objects = 1;
 106         revs.blob_objects = 1;
 107         if (use_thin_pack)
 108                 revs.edge_hint = 1;
 109
 110         for (i = 0; i < want_obj.nr; i++) {
 111                 struct object *o = want_obj.objects[i].item;
 112                 /* why??? */
 113                 o->flags &= ~UNINTERESTING;
 114                 add_pending_object(&revs, o, NULL);
 115         }
 116         for (i = 0; i < have_obj.nr; i++) {
 117                 struct object *o = have_obj.objects[i].item;
 118                 o->flags |= UNINTERESTING;
 119                 add_pending_object(&revs, o, NULL);
 120         }
 121         setup_revisions(0, NULL, &revs, NULL);
 122         if (prepare_revision_walk(&revs))
 123                 die("revision walk setup failed");
 124         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 125         if (use_thin_pack)
 126                 for (i = 0; i < extra_edge_obj.nr; i++)
 127                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
 128                                         extra_edge_obj.objects[i].item->sha1));
 129         traverse_commit_list(&revs, show_commit, show_object, NULL);
 130         fflush(pack_pipe);
 131         fclose(pack_pipe);
 132         return 0;
 133 }
 134
 135 static void create_pack_file(void)
 136 {
 137         struct async rev_list;
 138         struct child_process pack_objects;
 139         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
 140         char data[8193], progress[128];
 141         char abort_msg[] = "aborting due to possible repository "
 142                 "corruption on the remote side.";
 143         int buffered = -1;
 144         ssize_t sz;
 145         const char *argv[10];
 146         int arg = 0;
 147
 148         argv[arg++] = "pack-objects";
 149         if (!shallow_nr) {
 150                 argv[arg++] = "--revs";
 151                 if (create_full_pack)
 152                         argv[arg++] = "--all";
 153                 else if (use_thin_pack)
 154                         argv[arg++] = "--thin";
 155         }
 156
 157         argv[arg++] = "--stdout";
 158         if (!no_progress)
 159                 argv[arg++] = "--progress";
 160         if (use_ofs_delta)
 161                 argv[arg++] = "--delta-base-offset";
 162         if (use_include_tag)
 163                 argv[arg++] = "--include-tag";
 164         argv[arg++] = NULL;
 165
 166         memset(&pack_objects, 0, sizeof(pack_objects));
 167         pack_objects.in = -1;
 168         pack_objects.out = -1;
 169         pack_objects.err = -1;
 170         pack_objects.git_cmd = 1;
 171         pack_objects.argv = argv;
 172
 173         if (start_command(&pack_objects))
 174                 die("git upload-pack: unable to fork git-pack-objects");
 175
 176         if (shallow_nr) {
 177                 memset(&rev_list, 0, sizeof(rev_list));
 178                 rev_list.proc = do_rev_list;
 179                 rev_list.out = pack_objects.in;
 180                 if (start_async(&rev_list))
 181                         die("git upload-pack: unable to fork git-rev-list");
 182         }
 183         else {
 184                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
 185                 if (!create_full_pack) {
 186                         int i;
 187                         for (i = 0; i < want_obj.nr; i++)
 188                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(want_obj.objects[i].item->sha1));
 189                         fprintf(pipe_fd, "--not\n");
 190                         for (i = 0; i < have_obj.nr; i++)
 191                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(have_obj.objects[i].item->sha1));
 192                 }
 193
 194                 fprintf(pipe_fd, "\n");
 195                 fflush(pipe_fd);
 196                 fclose(pipe_fd);
 197         }
 198
 199
 200         /* We read from pack_objects.err to capture stderr output for
 201          * progress bar, and pack_objects.out to capture the pack data.
 202          */
 203
 204         while (1) {
 205                 struct pollfd pfd[2];
 206                 int pe, pu, pollsize;
 207
 208                 reset_timeout();
 209
 210                 pollsize = 0;
 211                 pe = pu = -1;
 212
 213                 if (0 <= pack_objects.out) {
 214                         pfd[pollsize].fd = pack_objects.out;
 215                         pfd[pollsize].events = POLLIN;
 216                         pu = pollsize;
 217                         pollsize++;
 218                 }
 219                 if (0 <= pack_objects.err) {
 220                         pfd[pollsize].fd = pack_objects.err;
 221                         pfd[pollsize].events = POLLIN;
 222                         pe = pollsize;
 223                         pollsize++;
 224                 }
 225
 226                 if (!pollsize)
 227                         break;
 228
 229                 if (poll(pfd, pollsize, -1) < 0) {
 230                         if (errno != EINTR) {
 231                                 error("poll failed, resuming: %s",
 232                                       strerror(errno));
 233                                 sleep(1);
 234                         }
 235                         continue;
 236                 }
 237                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 238                         /* Status ready; we ship that in the side-band
 239                          * or dump to the standard error.
 240                          */
 241                         sz = xread(pack_objects.err, progress,
 242                                   sizeof(progress));
 243                         if (0 < sz)
 244                                 send_client_data(2, progress, sz);
 245                         else if (sz == 0) {
 246                                 close(pack_objects.err);
 247                                 pack_objects.err = -1;
 248                         }
 249                         else
 250                                 goto fail;
 251                         /* give priority to status messages */
 252                         continue;
 253                 }
 254                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 255                         /* Data ready; we keep the last byte to ourselves
 256                          * in case we detect broken rev-list, so that we
 257                          * can leave the stream corrupted.  This is
 258                          * unfortunate -- unpack-objects would happily
 259                          * accept a valid packdata with trailing garbage,
 260                          * so appending garbage after we pass all the
 261                          * pack data is not good enough to signal
 262                          * breakage to downstream.
 263                          */
 264                         char *cp = data;
 265                         ssize_t outsz = 0;
 266                         if (0 <= buffered) {
 267                                 *cp++ = buffered;
 268                                 outsz++;
 269                         }
 270                         sz = xread(pack_objects.out, cp,
 271                                   sizeof(data) - outsz);
 272                         if (0 < sz)
 273                                 ;
 274                         else if (sz == 0) {
 275                                 close(pack_objects.out);
 276                                 pack_objects.out = -1;
 277                         }
 278                         else
 279                                 goto fail;
 280                         sz += outsz;
 281                         if (1 < sz) {
 282                                 buffered = data[sz-1] & 0xFF;
 283                                 sz--;
 284                         }
 285                         else
 286                                 buffered = -1;
 287                         sz = send_client_data(1, data, sz);
 288                         if (sz < 0)
 289                                 goto fail;
 290                 }
 291         }
 292
 293         if (finish_command(&pack_objects)) {
 294                 error("git upload-pack: git-pack-objects died with error.");
 295                 goto fail;
 296         }
 297         if (shallow_nr && finish_async(&rev_list))
 298                 goto fail;      /* error was already reported */
 299
 300         /* flush the data */
 301         if (0 <= buffered) {
 302                 data[0] = buffered;
 303                 sz = send_client_data(1, data, 1);
 304                 if (sz < 0)
 305                         goto fail;
 306                 fprintf(stderr, "flushed.\n");
 307         }
 308         if (use_sideband)
 309                 packet_flush(1);
 310         return;
 311
 312  fail:
 313         send_client_data(3, abort_msg, sizeof(abort_msg));
 314         die("git upload-pack: %s", abort_msg);
 315 }
 316
 317 static int got_sha1(char *hex, unsigned char *sha1)
 318 {
 319         struct object *o;
 320         int we_knew_they_have = 0;
 321
 322         if (get_sha1_hex(hex, sha1))
 323                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 324         if (!has_sha1_file(sha1))
 325                 return -1;
 326
 327         o = lookup_object(sha1);
 328         if (!(o && o->parsed))
 329                 o = parse_object(sha1);
 330         if (!o)
 331                 die("oops (%s)", sha1_to_hex(sha1));
 332         if (o->type == OBJ_COMMIT) {
 333                 struct commit_list *parents;
 334                 struct commit *commit = (struct commit *)o;
 335                 if (o->flags & THEY_HAVE)
 336                         we_knew_they_have = 1;
 337                 else
 338                         o->flags |= THEY_HAVE;
 339                 if (!oldest_have || (commit->date < oldest_have))
 340                         oldest_have = commit->date;
 341                 for (parents = commit->parents;
 342                      parents;
 343                      parents = parents->next)
 344                         parents->item->object.flags |= THEY_HAVE;
 345         }
 346         if (!we_knew_they_have) {
 347                 add_object_array(o, NULL, &have_obj);
 348                 return 1;
 349         }
 350         return 0;
 351 }
 352
 353 static int reachable(struct commit *want)
 354 {
 355         struct commit_list *work = NULL;
 356
 357         commit_list_insert_by_date(want, &work);
 358         while (work) {
 359                 struct commit_list *list = work->next;
 360                 struct commit *commit = work->item;
 361                 free(work);
 362                 work = list;
 363
 364                 if (commit->object.flags & THEY_HAVE) {
 365                         want->object.flags |= COMMON_KNOWN;
 366                         break;
 367                 }
 368                 if (!commit->object.parsed)
 369                         parse_object(commit->object.sha1);
 370                 if (commit->object.flags & REACHABLE)
 371                         continue;
 372                 commit->object.flags |= REACHABLE;
 373                 if (commit->date < oldest_have)
 374                         continue;
 375                 for (list = commit->parents; list; list = list->next) {
 376                         struct commit *parent = list->item;
 377                         if (!(parent->object.flags & REACHABLE))
 378                                 commit_list_insert_by_date(parent, &work);
 379                 }
 380         }
 381         want->object.flags |= REACHABLE;
 382         clear_commit_marks(want, REACHABLE);
 383         free_commit_list(work);
 384         return (want->object.flags & COMMON_KNOWN);
 385 }
 386
 387 static int ok_to_give_up(void)
 388 {
 389         int i;
 390
 391         if (!have_obj.nr)
 392                 return 0;
 393
 394         for (i = 0; i < want_obj.nr; i++) {
 395                 struct object *want = want_obj.objects[i].item;
 396
 397                 if (want->flags & COMMON_KNOWN)
 398                         continue;
 399                 want = deref_tag(want, "a want line", 0);
 400                 if (!want || want->type != OBJ_COMMIT) {
 401                         /* no way to tell if this is reachable by
 402                          * looking at the ancestry chain alone, so
 403                          * leave a note to ourselves not to worry about
 404                          * this object anymore.
 405                          */
 406                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 407                         continue;
 408                 }
 409                 if (!reachable((struct commit *)want))
 410                         return 0;
 411         }
 412         return 1;
 413 }
 414
 415 static int get_common_commits(void)
 416 {
 417         static char line[1000];
 418         unsigned char sha1[20];
 419         char last_hex[41];
 420         int got_common = 0;
 421         int got_other = 0;
 422         int sent_ready = 0;
 423
 424         save_commit_buffer = 0;
 425
 426         for (;;) {
 427                 int len = packet_read_line(0, line, sizeof(line));
 428                 reset_timeout();
 429
 430                 if (!len) {
 431                         if (multi_ack == 2 && got_common
 432                             && !got_other && ok_to_give_up()) {
 433                                 sent_ready = 1;
 434                                 packet_write(1, "ACK %s ready\n", last_hex);
 435                         }
 436                         if (have_obj.nr == 0 || multi_ack)
 437                                 packet_write(1, "NAK\n");
 438
 439                         if (no_done && sent_ready) {
 440                                 packet_write(1, "ACK %s\n", last_hex);
 441                                 return 0;
 442                         }
 443                         if (stateless_rpc)
 444                                 exit(0);
 445                         got_common = 0;
 446                         got_other = 0;
 447                         continue;
 448                 }
 449                 strip(line, len);
 450                 if (!prefixcmp(line, "have ")) {
 451                         switch (got_sha1(line+5, sha1)) {
 452                         case -1: /* they have what we do not */
 453                                 got_other = 1;
 454                                 if (multi_ack && ok_to_give_up()) {
 455                                         const char *hex = sha1_to_hex(sha1);
 456                                         if (multi_ack == 2) {
 457                                                 sent_ready = 1;
 458                                                 packet_write(1, "ACK %s ready\n", hex);
 459                                         } else
 460                                                 packet_write(1, "ACK %s continue\n", hex);
 461                                 }
 462                                 break;
 463                         default:
 464                                 got_common = 1;
 465                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 466                                 if (multi_ack == 2)
 467                                         packet_write(1, "ACK %s common\n", last_hex);
 468                                 else if (multi_ack)
 469                                         packet_write(1, "ACK %s continue\n", last_hex);
 470                                 else if (have_obj.nr == 1)
 471                                         packet_write(1, "ACK %s\n", last_hex);
 472                                 break;
 473                         }
 474                         continue;
 475                 }
 476                 if (!strcmp(line, "done")) {
 477                         if (have_obj.nr > 0) {
 478                                 if (multi_ack)
 479                                         packet_write(1, "ACK %s\n", last_hex);
 480                                 return 0;
 481                         }
 482                         packet_write(1, "NAK\n");
 483                         return -1;
 484                 }
 485                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 486         }
 487 }
 488
 489 static void check_non_tip(void)
 490 {
 491         static const char *argv[] = {
 492                 "rev-list", "--stdin", NULL,
 493         };
 494         static struct child_process cmd;
 495         struct object *o;
 496         char namebuf[42]; /* ^ + SHA-1 + LF */
 497         int i;
 498
 499         /* In the normal in-process case non-tip request can never happen */
 500         if (!stateless_rpc)
 501                 goto error;
 502
 503         cmd.argv = argv;
 504         cmd.git_cmd = 1;
 505         cmd.no_stderr = 1;
 506         cmd.in = -1;
 507         cmd.out = -1;
 508
 509         if (start_command(&cmd))
 510                 goto error;
 511
 512         /*
 513          * If rev-list --stdin encounters an unknown commit, it
 514          * terminates, which will cause SIGPIPE in the write loop
 515          * below.
 516          */
 517         sigchain_push(SIGPIPE, SIG_IGN);
 518
 519         namebuf[0] = '^';
 520         namebuf[41] = '\n';
 521         for (i = get_max_object_index(); 0 < i; ) {
 522                 o = get_indexed_object(--i);
 523                 if (!o)
 524                         continue;
 525                 if (!(o->flags & OUR_REF))
 526                         continue;
 527                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 528                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 529                         goto error;
 530         }
 531         namebuf[40] = '\n';
 532         for (i = 0; i < want_obj.nr; i++) {
 533                 o = want_obj.objects[i].item;
 534                 if (o->flags & OUR_REF)
 535                         continue;
 536                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 537                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 538                         goto error;
 539         }
 540         close(cmd.in);
 541
 542         sigchain_pop(SIGPIPE);
 543
 544         /*
 545          * The commits out of the rev-list are not ancestors of
 546          * our ref.
 547          */
 548         i = read_in_full(cmd.out, namebuf, 1);
 549         if (i)
 550                 goto error;
 551         close(cmd.out);
 552
 553         /*
 554          * rev-list may have died by encountering a bad commit
 555          * in the history, in which case we do want to bail out
 556          * even when it showed no commit.
 557          */
 558         if (finish_command(&cmd))
 559                 goto error;
 560
 561         /* All the non-tip ones are ancestors of what we advertised */
 562         return;
 563
 564 error:
 565         /* Pick one of them (we know there at least is one) */
 566         for (i = 0; i < want_obj.nr; i++) {
 567                 o = want_obj.objects[i].item;
 568                 if (!(o->flags & OUR_REF))
 569                         die("git upload-pack: not our ref %s",
 570                             sha1_to_hex(o->sha1));
 571         }
 572 }
 573
 574 static void receive_needs(void)
 575 {
 576         struct object_array shallows = OBJECT_ARRAY_INIT;
 577         static char line[1000];
 578         int len, depth = 0;
 579         int has_non_tip = 0;
 580
 581         shallow_nr = 0;
 582         if (debug_fd)
 583                 write_str_in_full(debug_fd, "#S\n");
 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                 if (debug_fd)
 592                         write_in_full(debug_fd, line, len);
 593
 594                 if (!prefixcmp(line, "shallow ")) {
 595                         unsigned char sha1[20];
 596                         struct object *object;
 597                         if (get_sha1(line + 8, sha1))
 598                                 die("invalid shallow line: %s", line);
 599                         object = parse_object(sha1);
 600                         if (!object)
 601                                 die("did not find object for %s", line);
 602                         object->flags |= CLIENT_SHALLOW;
 603                         add_object_array(object, NULL, &shallows);
 604                         continue;
 605                 }
 606                 if (!prefixcmp(line, "deepen ")) {
 607                         char *end;
 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 (prefixcmp(line, "want ") ||
 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_detailed"))
 618                         multi_ack = 2;
 619                 else if (strstr(line+45, "multi_ack"))
 620                         multi_ack = 1;
 621                 if (strstr(line+45, "no-done"))
 622                         no_done = 1;
 623                 if (strstr(line+45, "thin-pack"))
 624                         use_thin_pack = 1;
 625                 if (strstr(line+45, "ofs-delta"))
 626                         use_ofs_delta = 1;
 627                 if (strstr(line+45, "side-band-64k"))
 628                         use_sideband = LARGE_PACKET_MAX;
 629                 else if (strstr(line+45, "side-band"))
 630                         use_sideband = DEFAULT_PACKET_MAX;
 631                 if (strstr(line+45, "no-progress"))
 632                         no_progress = 1;
 633                 if (strstr(line+45, "include-tag"))
 634                         use_include_tag = 1;
 635
 636                 o = lookup_object(sha1_buf);
 637                 if (!o)
 638                         die("git upload-pack: not our ref %s",
 639                             sha1_to_hex(sha1_buf));
 640                 if (!(o->flags & WANTED)) {
 641                         o->flags |= WANTED;
 642                         if (!(o->flags & OUR_REF))
 643                                 has_non_tip = 1;
 644                         add_object_array(o, NULL, &want_obj);
 645                 }
 646         }
 647         if (debug_fd)
 648                 write_str_in_full(debug_fd, "#E\n");
 649
 650         /*
 651          * We have sent all our refs already, and the other end
 652          * should have chosen out of them. When we are operating
 653          * in the stateless RPC mode, however, their choice may
 654          * have been based on the set of older refs advertised
 655          * by another process that handled the initial request.
 656          */
 657         if (has_non_tip)
 658                 check_non_tip();
 659
 660         if (!use_sideband && daemon_mode)
 661                 no_progress = 1;
 662
 663         if (depth == 0 && shallows.nr == 0)
 664                 return;
 665         if (depth > 0) {
 666                 struct commit_list *result, *backup;
 667                 int i;
 668                 backup = result = get_shallow_commits(&want_obj, depth,
 669                         SHALLOW, NOT_SHALLOW);
 670                 while (result) {
 671                         struct object *object = &result->item->object;
 672                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 673                                 packet_write(1, "shallow %s",
 674                                                 sha1_to_hex(object->sha1));
 675                                 register_shallow(object->sha1);
 676                                 shallow_nr++;
 677                         }
 678                         result = result->next;
 679                 }
 680                 free_commit_list(backup);
 681                 for (i = 0; i < shallows.nr; i++) {
 682                         struct object *object = shallows.objects[i].item;
 683                         if (object->flags & NOT_SHALLOW) {
 684                                 struct commit_list *parents;
 685                                 packet_write(1, "unshallow %s",
 686                                         sha1_to_hex(object->sha1));
 687                                 object->flags &= ~CLIENT_SHALLOW;
 688                                 /* make sure the real parents are parsed */
 689                                 unregister_shallow(object->sha1);
 690                                 object->parsed = 0;
 691                                 if (parse_commit((struct commit *)object))
 692                                         die("invalid commit");
 693                                 parents = ((struct commit *)object)->parents;
 694                                 while (parents) {
 695                                         add_object_array(&parents->item->object,
 696                                                         NULL, &want_obj);
 697                                         parents = parents->next;
 698                                 }
 699                                 add_object_array(object, NULL, &extra_edge_obj);
 700                         }
 701                         /* make sure commit traversal conforms to client */
 702                         register_shallow(object->sha1);
 703                 }
 704                 packet_flush(1);
 705         } else
 706                 if (shallows.nr > 0) {
 707                         int i;
 708                         for (i = 0; i < shallows.nr; i++)
 709                                 register_shallow(shallows.objects[i].item->sha1);
 710                 }
 711
 712         shallow_nr += shallows.nr;
 713         free(shallows.objects);
 714 }
 715
 716 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 717 {
 718         static const char *capabilities = "multi_ack thin-pack side-band"
 719                 " side-band-64k ofs-delta shallow no-progress"
 720                 " include-tag multi_ack_detailed";
 721         struct object *o = parse_object(sha1);
 722         const char *refname_nons = strip_namespace(refname);
 723
 724         if (!o)
 725                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 726
 727         if (capabilities)
 728                 packet_write(1, "%s %s%c%s%s\n", sha1_to_hex(sha1), refname_nons,
 729                              0, capabilities,
 730                              stateless_rpc ? " no-done" : "");
 731         else
 732                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 733         capabilities = NULL;
 734         if (!(o->flags & OUR_REF)) {
 735                 o->flags |= OUR_REF;
 736                 nr_our_refs++;
 737         }
 738         if (o->type == OBJ_TAG) {
 739                 o = deref_tag(o, refname, 0);
 740                 if (o)
 741                         packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname_nons);
 742         }
 743         return 0;
 744 }
 745
 746 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 747 {
 748         struct object *o = parse_object(sha1);
 749         if (!o)
 750                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 751         if (!(o->flags & OUR_REF)) {
 752                 o->flags |= OUR_REF;
 753                 nr_our_refs++;
 754         }
 755         return 0;
 756 }
 757
 758 static void upload_pack(void)
 759 {
 760         if (advertise_refs || !stateless_rpc) {
 761                 reset_timeout();
 762                 head_ref_namespaced(send_ref, NULL);
 763                 for_each_namespaced_ref(send_ref, NULL);
 764                 packet_flush(1);
 765         } else {
 766                 head_ref_namespaced(mark_our_ref, NULL);
 767                 for_each_namespaced_ref(mark_our_ref, NULL);
 768         }
 769         if (advertise_refs)
 770                 return;
 771
 772         receive_needs();
 773         if (want_obj.nr) {
 774                 get_common_commits();
 775                 create_pack_file();
 776         }
 777 }
 778
 779 int main(int argc, char **argv)
 780 {
 781         char *dir;
 782         int i;
 783         int strict = 0;
 784
 785         packet_trace_identity("upload-pack");
 786         git_extract_argv0_path(argv[0]);
 787         read_replace_refs = 0;
 788
 789         for (i = 1; i < argc; i++) {
 790                 char *arg = argv[i];
 791
 792                 if (arg[0] != '-')
 793                         break;
 794                 if (!strcmp(arg, "--advertise-refs")) {
 795                         advertise_refs = 1;
 796                         continue;
 797                 }
 798                 if (!strcmp(arg, "--stateless-rpc")) {
 799                         stateless_rpc = 1;
 800                         continue;
 801                 }
 802                 if (!strcmp(arg, "--strict")) {
 803                         strict = 1;
 804                         continue;
 805                 }
 806                 if (!prefixcmp(arg, "--timeout=")) {
 807                         timeout = atoi(arg+10);
 808                         daemon_mode = 1;
 809                         continue;
 810                 }
 811                 if (!strcmp(arg, "--")) {
 812                         i++;
 813                         break;
 814                 }
 815         }
 816
 817         if (i != argc-1)
 818                 usage(upload_pack_usage);
 819
 820         setup_path();
 821
 822         dir = argv[i];
 823
 824         if (!enter_repo(dir, strict))
 825                 die("'%s' does not appear to be a git repository", dir);
 826         if (is_repository_shallow())
 827                 die("attempt to fetch/clone from a shallow repository");
 828         if (getenv("GIT_DEBUG_SEND_PACK"))
 829                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
 830         upload_pack();
 831         return 0;
 832 }