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 #include "version.h"
  15 #include "string-list.h"
  16
  17 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  18
  19 /* bits #0..7 in revision.h, #8..10 in commit.c */
  20 #define THEY_HAVE       (1u << 11)
  21 #define OUR_REF         (1u << 12)
  22 #define WANTED          (1u << 13)
  23 #define COMMON_KNOWN    (1u << 14)
  24 #define REACHABLE       (1u << 15)
  25
  26 #define SHALLOW         (1u << 16)
  27 #define NOT_SHALLOW     (1u << 17)
  28 #define CLIENT_SHALLOW  (1u << 18)
  29
  30 static unsigned long oldest_have;
  31
  32 static int multi_ack;
  33 static int no_done;
  34 static int use_thin_pack, use_ofs_delta, use_include_tag;
  35 static int no_progress, daemon_mode;
  36 static int shallow_nr;
  37 static struct object_array have_obj;
  38 static struct object_array want_obj;
  39 static struct object_array extra_edge_obj;
  40 static unsigned int timeout;
  41 /* 0 for no sideband,
  42  * otherwise maximum packet size (up to 65520 bytes).
  43  */
  44 static int use_sideband;
  45 static int advertise_refs;
  46 static int stateless_rpc;
  47
  48 static void reset_timeout(void)
  49 {
  50         alarm(timeout);
  51 }
  52
  53 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  54 {
  55         if (use_sideband)
  56                 return send_sideband(1, fd, data, sz, use_sideband);
  57         if (fd == 3)
  58                 /* emergency quit */
  59                 fd = 2;
  60         if (fd == 2) {
  61                 /* XXX: are we happy to lose stuff here? */
  62                 xwrite(fd, data, sz);
  63                 return sz;
  64         }
  65         write_or_die(fd, data, sz);
  66         return sz;
  67 }
  68
  69 static FILE *pack_pipe = NULL;
  70 static void show_commit(struct commit *commit, void *data)
  71 {
  72         if (commit->object.flags & BOUNDARY)
  73                 fputc('-', pack_pipe);
  74         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
  75                 die("broken output pipe");
  76         fputc('\n', pack_pipe);
  77         fflush(pack_pipe);
  78         free(commit->buffer);
  79         commit->buffer = NULL;
  80 }
  81
  82 static void show_object(struct object *obj,
  83                         const struct name_path *path, const char *component,
  84                         void *cb_data)
  85 {
  86         show_object_with_name(pack_pipe, obj, path, component);
  87 }
  88
  89 static void show_edge(struct commit *commit)
  90 {
  91         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
  92 }
  93
  94 static int do_rev_list(int in, int out, void *user_data)
  95 {
  96         int i;
  97         struct rev_info revs;
  98
  99         pack_pipe = xfdopen(out, "w");
 100         init_revisions(&revs, NULL);
 101         revs.tag_objects = 1;
 102         revs.tree_objects = 1;
 103         revs.blob_objects = 1;
 104         if (use_thin_pack)
 105                 revs.edge_hint = 1;
 106
 107         for (i = 0; i < want_obj.nr; i++) {
 108                 struct object *o = want_obj.objects[i].item;
 109                 /* why??? */
 110                 o->flags &= ~UNINTERESTING;
 111                 add_pending_object(&revs, o, NULL);
 112         }
 113         for (i = 0; i < have_obj.nr; i++) {
 114                 struct object *o = have_obj.objects[i].item;
 115                 o->flags |= UNINTERESTING;
 116                 add_pending_object(&revs, o, NULL);
 117         }
 118         setup_revisions(0, NULL, &revs, NULL);
 119         if (prepare_revision_walk(&revs))
 120                 die("revision walk setup failed");
 121         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 122         if (use_thin_pack)
 123                 for (i = 0; i < extra_edge_obj.nr; i++)
 124                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
 125                                         extra_edge_obj.objects[i].item->sha1));
 126         traverse_commit_list(&revs, show_commit, show_object, NULL);
 127         fflush(pack_pipe);
 128         fclose(pack_pipe);
 129         return 0;
 130 }
 131
 132 static void create_pack_file(void)
 133 {
 134         struct async rev_list;
 135         struct child_process pack_objects;
 136         char data[8193], progress[128];
 137         char abort_msg[] = "aborting due to possible repository "
 138                 "corruption on the remote side.";
 139         int buffered = -1;
 140         ssize_t sz;
 141         const char *argv[10];
 142         int arg = 0;
 143
 144         argv[arg++] = "pack-objects";
 145         if (!shallow_nr) {
 146                 argv[arg++] = "--revs";
 147                 if (use_thin_pack)
 148                         argv[arg++] = "--thin";
 149         }
 150
 151         argv[arg++] = "--stdout";
 152         if (!no_progress)
 153                 argv[arg++] = "--progress";
 154         if (use_ofs_delta)
 155                 argv[arg++] = "--delta-base-offset";
 156         if (use_include_tag)
 157                 argv[arg++] = "--include-tag";
 158         argv[arg++] = NULL;
 159
 160         memset(&pack_objects, 0, sizeof(pack_objects));
 161         pack_objects.in = -1;
 162         pack_objects.out = -1;
 163         pack_objects.err = -1;
 164         pack_objects.git_cmd = 1;
 165         pack_objects.argv = argv;
 166
 167         if (start_command(&pack_objects))
 168                 die("git upload-pack: unable to fork git-pack-objects");
 169
 170         if (shallow_nr) {
 171                 memset(&rev_list, 0, sizeof(rev_list));
 172                 rev_list.proc = do_rev_list;
 173                 rev_list.out = pack_objects.in;
 174                 if (start_async(&rev_list))
 175                         die("git upload-pack: unable to fork git-rev-list");
 176         }
 177         else {
 178                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
 179                 int i;
 180
 181                 for (i = 0; i < want_obj.nr; i++)
 182                         fprintf(pipe_fd, "%s\n",
 183                                 sha1_to_hex(want_obj.objects[i].item->sha1));
 184                 fprintf(pipe_fd, "--not\n");
 185                 for (i = 0; i < have_obj.nr; i++)
 186                         fprintf(pipe_fd, "%s\n",
 187                                 sha1_to_hex(have_obj.objects[i].item->sha1));
 188                 fprintf(pipe_fd, "\n");
 189                 fflush(pipe_fd);
 190                 fclose(pipe_fd);
 191         }
 192
 193
 194         /* We read from pack_objects.err to capture stderr output for
 195          * progress bar, and pack_objects.out to capture the pack data.
 196          */
 197
 198         while (1) {
 199                 struct pollfd pfd[2];
 200                 int pe, pu, pollsize;
 201
 202                 reset_timeout();
 203
 204                 pollsize = 0;
 205                 pe = pu = -1;
 206
 207                 if (0 <= pack_objects.out) {
 208                         pfd[pollsize].fd = pack_objects.out;
 209                         pfd[pollsize].events = POLLIN;
 210                         pu = pollsize;
 211                         pollsize++;
 212                 }
 213                 if (0 <= pack_objects.err) {
 214                         pfd[pollsize].fd = pack_objects.err;
 215                         pfd[pollsize].events = POLLIN;
 216                         pe = pollsize;
 217                         pollsize++;
 218                 }
 219
 220                 if (!pollsize)
 221                         break;
 222
 223                 if (poll(pfd, pollsize, -1) < 0) {
 224                         if (errno != EINTR) {
 225                                 error("poll failed, resuming: %s",
 226                                       strerror(errno));
 227                                 sleep(1);
 228                         }
 229                         continue;
 230                 }
 231                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 232                         /* Status ready; we ship that in the side-band
 233                          * or dump to the standard error.
 234                          */
 235                         sz = xread(pack_objects.err, progress,
 236                                   sizeof(progress));
 237                         if (0 < sz)
 238                                 send_client_data(2, progress, sz);
 239                         else if (sz == 0) {
 240                                 close(pack_objects.err);
 241                                 pack_objects.err = -1;
 242                         }
 243                         else
 244                                 goto fail;
 245                         /* give priority to status messages */
 246                         continue;
 247                 }
 248                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 249                         /* Data ready; we keep the last byte to ourselves
 250                          * in case we detect broken rev-list, so that we
 251                          * can leave the stream corrupted.  This is
 252                          * unfortunate -- unpack-objects would happily
 253                          * accept a valid packdata with trailing garbage,
 254                          * so appending garbage after we pass all the
 255                          * pack data is not good enough to signal
 256                          * breakage to downstream.
 257                          */
 258                         char *cp = data;
 259                         ssize_t outsz = 0;
 260                         if (0 <= buffered) {
 261                                 *cp++ = buffered;
 262                                 outsz++;
 263                         }
 264                         sz = xread(pack_objects.out, cp,
 265                                   sizeof(data) - outsz);
 266                         if (0 < sz)
 267                                 ;
 268                         else if (sz == 0) {
 269                                 close(pack_objects.out);
 270                                 pack_objects.out = -1;
 271                         }
 272                         else
 273                                 goto fail;
 274                         sz += outsz;
 275                         if (1 < sz) {
 276                                 buffered = data[sz-1] & 0xFF;
 277                                 sz--;
 278                         }
 279                         else
 280                                 buffered = -1;
 281                         sz = send_client_data(1, data, sz);
 282                         if (sz < 0)
 283                                 goto fail;
 284                 }
 285         }
 286
 287         if (finish_command(&pack_objects)) {
 288                 error("git upload-pack: git-pack-objects died with error.");
 289                 goto fail;
 290         }
 291         if (shallow_nr && finish_async(&rev_list))
 292                 goto fail;      /* error was already reported */
 293
 294         /* flush the data */
 295         if (0 <= buffered) {
 296                 data[0] = buffered;
 297                 sz = send_client_data(1, data, 1);
 298                 if (sz < 0)
 299                         goto fail;
 300                 fprintf(stderr, "flushed.\n");
 301         }
 302         if (use_sideband)
 303                 packet_flush(1);
 304         return;
 305
 306  fail:
 307         send_client_data(3, abort_msg, sizeof(abort_msg));
 308         die("git upload-pack: %s", abort_msg);
 309 }
 310
 311 static int got_sha1(char *hex, unsigned char *sha1)
 312 {
 313         struct object *o;
 314         int we_knew_they_have = 0;
 315
 316         if (get_sha1_hex(hex, sha1))
 317                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 318         if (!has_sha1_file(sha1))
 319                 return -1;
 320
 321         o = lookup_object(sha1);
 322         if (!(o && o->parsed))
 323                 o = parse_object(sha1);
 324         if (!o)
 325                 die("oops (%s)", sha1_to_hex(sha1));
 326         if (o->type == OBJ_COMMIT) {
 327                 struct commit_list *parents;
 328                 struct commit *commit = (struct commit *)o;
 329                 if (o->flags & THEY_HAVE)
 330                         we_knew_they_have = 1;
 331                 else
 332                         o->flags |= THEY_HAVE;
 333                 if (!oldest_have || (commit->date < oldest_have))
 334                         oldest_have = commit->date;
 335                 for (parents = commit->parents;
 336                      parents;
 337                      parents = parents->next)
 338                         parents->item->object.flags |= THEY_HAVE;
 339         }
 340         if (!we_knew_they_have) {
 341                 add_object_array(o, NULL, &have_obj);
 342                 return 1;
 343         }
 344         return 0;
 345 }
 346
 347 static int reachable(struct commit *want)
 348 {
 349         struct commit_list *work = NULL;
 350
 351         commit_list_insert_by_date(want, &work);
 352         while (work) {
 353                 struct commit_list *list = work->next;
 354                 struct commit *commit = work->item;
 355                 free(work);
 356                 work = list;
 357
 358                 if (commit->object.flags & THEY_HAVE) {
 359                         want->object.flags |= COMMON_KNOWN;
 360                         break;
 361                 }
 362                 if (!commit->object.parsed)
 363                         parse_object(commit->object.sha1);
 364                 if (commit->object.flags & REACHABLE)
 365                         continue;
 366                 commit->object.flags |= REACHABLE;
 367                 if (commit->date < oldest_have)
 368                         continue;
 369                 for (list = commit->parents; list; list = list->next) {
 370                         struct commit *parent = list->item;
 371                         if (!(parent->object.flags & REACHABLE))
 372                                 commit_list_insert_by_date(parent, &work);
 373                 }
 374         }
 375         want->object.flags |= REACHABLE;
 376         clear_commit_marks(want, REACHABLE);
 377         free_commit_list(work);
 378         return (want->object.flags & COMMON_KNOWN);
 379 }
 380
 381 static int ok_to_give_up(void)
 382 {
 383         int i;
 384
 385         if (!have_obj.nr)
 386                 return 0;
 387
 388         for (i = 0; i < want_obj.nr; i++) {
 389                 struct object *want = want_obj.objects[i].item;
 390
 391                 if (want->flags & COMMON_KNOWN)
 392                         continue;
 393                 want = deref_tag(want, "a want line", 0);
 394                 if (!want || want->type != OBJ_COMMIT) {
 395                         /* no way to tell if this is reachable by
 396                          * looking at the ancestry chain alone, so
 397                          * leave a note to ourselves not to worry about
 398                          * this object anymore.
 399                          */
 400                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 401                         continue;
 402                 }
 403                 if (!reachable((struct commit *)want))
 404                         return 0;
 405         }
 406         return 1;
 407 }
 408
 409 static int get_common_commits(void)
 410 {
 411         static char line[1000];
 412         unsigned char sha1[20];
 413         char last_hex[41];
 414         int got_common = 0;
 415         int got_other = 0;
 416         int sent_ready = 0;
 417
 418         save_commit_buffer = 0;
 419
 420         for (;;) {
 421                 int len = packet_read_line(0, line, sizeof(line));
 422                 reset_timeout();
 423
 424                 if (!len) {
 425                         if (multi_ack == 2 && got_common
 426                             && !got_other && ok_to_give_up()) {
 427                                 sent_ready = 1;
 428                                 packet_write(1, "ACK %s ready\n", last_hex);
 429                         }
 430                         if (have_obj.nr == 0 || multi_ack)
 431                                 packet_write(1, "NAK\n");
 432
 433                         if (no_done && sent_ready) {
 434                                 packet_write(1, "ACK %s\n", last_hex);
 435                                 return 0;
 436                         }
 437                         if (stateless_rpc)
 438                                 exit(0);
 439                         got_common = 0;
 440                         got_other = 0;
 441                         continue;
 442                 }
 443                 if (!prefixcmp(line, "have ")) {
 444                         switch (got_sha1(line+5, sha1)) {
 445                         case -1: /* they have what we do not */
 446                                 got_other = 1;
 447                                 if (multi_ack && ok_to_give_up()) {
 448                                         const char *hex = sha1_to_hex(sha1);
 449                                         if (multi_ack == 2) {
 450                                                 sent_ready = 1;
 451                                                 packet_write(1, "ACK %s ready\n", hex);
 452                                         } else
 453                                                 packet_write(1, "ACK %s continue\n", hex);
 454                                 }
 455                                 break;
 456                         default:
 457                                 got_common = 1;
 458                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 459                                 if (multi_ack == 2)
 460                                         packet_write(1, "ACK %s common\n", last_hex);
 461                                 else if (multi_ack)
 462                                         packet_write(1, "ACK %s continue\n", last_hex);
 463                                 else if (have_obj.nr == 1)
 464                                         packet_write(1, "ACK %s\n", last_hex);
 465                                 break;
 466                         }
 467                         continue;
 468                 }
 469                 if (!strcmp(line, "done")) {
 470                         if (have_obj.nr > 0) {
 471                                 if (multi_ack)
 472                                         packet_write(1, "ACK %s\n", last_hex);
 473                                 return 0;
 474                         }
 475                         packet_write(1, "NAK\n");
 476                         return -1;
 477                 }
 478                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 479         }
 480 }
 481
 482 static void check_non_tip(void)
 483 {
 484         static const char *argv[] = {
 485                 "rev-list", "--stdin", NULL,
 486         };
 487         static struct child_process cmd;
 488         struct object *o;
 489         char namebuf[42]; /* ^ + SHA-1 + LF */
 490         int i;
 491
 492         /* In the normal in-process case non-tip request can never happen */
 493         if (!stateless_rpc)
 494                 goto error;
 495
 496         cmd.argv = argv;
 497         cmd.git_cmd = 1;
 498         cmd.no_stderr = 1;
 499         cmd.in = -1;
 500         cmd.out = -1;
 501
 502         if (start_command(&cmd))
 503                 goto error;
 504
 505         /*
 506          * If rev-list --stdin encounters an unknown commit, it
 507          * terminates, which will cause SIGPIPE in the write loop
 508          * below.
 509          */
 510         sigchain_push(SIGPIPE, SIG_IGN);
 511
 512         namebuf[0] = '^';
 513         namebuf[41] = '\n';
 514         for (i = get_max_object_index(); 0 < i; ) {
 515                 o = get_indexed_object(--i);
 516                 if (!o)
 517                         continue;
 518                 if (!(o->flags & OUR_REF))
 519                         continue;
 520                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 521                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 522                         goto error;
 523         }
 524         namebuf[40] = '\n';
 525         for (i = 0; i < want_obj.nr; i++) {
 526                 o = want_obj.objects[i].item;
 527                 if (o->flags & OUR_REF)
 528                         continue;
 529                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 530                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 531                         goto error;
 532         }
 533         close(cmd.in);
 534
 535         sigchain_pop(SIGPIPE);
 536
 537         /*
 538          * The commits out of the rev-list are not ancestors of
 539          * our ref.
 540          */
 541         i = read_in_full(cmd.out, namebuf, 1);
 542         if (i)
 543                 goto error;
 544         close(cmd.out);
 545
 546         /*
 547          * rev-list may have died by encountering a bad commit
 548          * in the history, in which case we do want to bail out
 549          * even when it showed no commit.
 550          */
 551         if (finish_command(&cmd))
 552                 goto error;
 553
 554         /* All the non-tip ones are ancestors of what we advertised */
 555         return;
 556
 557 error:
 558         /* Pick one of them (we know there at least is one) */
 559         for (i = 0; i < want_obj.nr; i++) {
 560                 o = want_obj.objects[i].item;
 561                 if (!(o->flags & OUR_REF))
 562                         die("git upload-pack: not our ref %s",
 563                             sha1_to_hex(o->sha1));
 564         }
 565 }
 566
 567 static void receive_needs(void)
 568 {
 569         struct object_array shallows = OBJECT_ARRAY_INIT;
 570         static char line[1000];
 571         int len, depth = 0;
 572         int has_non_tip = 0;
 573
 574         shallow_nr = 0;
 575         for (;;) {
 576                 struct object *o;
 577                 const char *features;
 578                 unsigned char sha1_buf[20];
 579                 len = packet_read_line(0, line, sizeof(line));
 580                 reset_timeout();
 581                 if (!len)
 582                         break;
 583
 584                 if (!prefixcmp(line, "shallow ")) {
 585                         unsigned char sha1[20];
 586                         struct object *object;
 587                         if (get_sha1_hex(line + 8, sha1))
 588                                 die("invalid shallow line: %s", line);
 589                         object = parse_object(sha1);
 590                         if (!object)
 591                                 die("did not find object for %s", line);
 592                         if (object->type != OBJ_COMMIT)
 593                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 594                         if (!(object->flags & CLIENT_SHALLOW)) {
 595                                 object->flags |= CLIENT_SHALLOW;
 596                                 add_object_array(object, NULL, &shallows);
 597                         }
 598                         continue;
 599                 }
 600                 if (!prefixcmp(line, "deepen ")) {
 601                         char *end;
 602                         depth = strtol(line + 7, &end, 0);
 603                         if (end == line + 7 || depth <= 0)
 604                                 die("Invalid deepen: %s", line);
 605                         continue;
 606                 }
 607                 if (prefixcmp(line, "want ") ||
 608                     get_sha1_hex(line+5, sha1_buf))
 609                         die("git upload-pack: protocol error, "
 610                             "expected to get sha, not '%s'", line);
 611
 612                 features = line + 45;
 613
 614                 if (parse_feature_request(features, "multi_ack_detailed"))
 615                         multi_ack = 2;
 616                 else if (parse_feature_request(features, "multi_ack"))
 617                         multi_ack = 1;
 618                 if (parse_feature_request(features, "no-done"))
 619                         no_done = 1;
 620                 if (parse_feature_request(features, "thin-pack"))
 621                         use_thin_pack = 1;
 622                 if (parse_feature_request(features, "ofs-delta"))
 623                         use_ofs_delta = 1;
 624                 if (parse_feature_request(features, "side-band-64k"))
 625                         use_sideband = LARGE_PACKET_MAX;
 626                 else if (parse_feature_request(features, "side-band"))
 627                         use_sideband = DEFAULT_PACKET_MAX;
 628                 if (parse_feature_request(features, "no-progress"))
 629                         no_progress = 1;
 630                 if (parse_feature_request(features, "include-tag"))
 631                         use_include_tag = 1;
 632
 633                 o = lookup_object(sha1_buf);
 634                 if (!o)
 635                         die("git upload-pack: not our ref %s",
 636                             sha1_to_hex(sha1_buf));
 637                 if (!(o->flags & WANTED)) {
 638                         o->flags |= WANTED;
 639                         if (!(o->flags & OUR_REF))
 640                                 has_non_tip = 1;
 641                         add_object_array(o, NULL, &want_obj);
 642                 }
 643         }
 644
 645         /*
 646          * We have sent all our refs already, and the other end
 647          * should have chosen out of them. When we are operating
 648          * in the stateless RPC mode, however, their choice may
 649          * have been based on the set of older refs advertised
 650          * by another process that handled the initial request.
 651          */
 652         if (has_non_tip)
 653                 check_non_tip();
 654
 655         if (!use_sideband && daemon_mode)
 656                 no_progress = 1;
 657
 658         if (depth == 0 && shallows.nr == 0)
 659                 return;
 660         if (depth > 0) {
 661                 struct commit_list *result = NULL, *backup = NULL;
 662                 int i;
 663                 if (depth == INFINITE_DEPTH)
 664                         for (i = 0; i < shallows.nr; i++) {
 665                                 struct object *object = shallows.objects[i].item;
 666                                 object->flags |= NOT_SHALLOW;
 667                         }
 668                 else
 669                         backup = result =
 670                                 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 /* return non-zero if the ref is hidden, otherwise 0 */
 719 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 720 {
 721         struct object *o = lookup_unknown_object(sha1);
 722
 723         if (ref_is_hidden(refname))
 724                 return 1;
 725         if (!o)
 726                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 727         o->flags |= OUR_REF;
 728         return 0;
 729 }
 730
 731 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 732 {
 733         static const char *capabilities = "multi_ack thin-pack side-band"
 734                 " side-band-64k ofs-delta shallow no-progress"
 735                 " include-tag multi_ack_detailed";
 736         const char *refname_nons = strip_namespace(refname);
 737         unsigned char peeled[20];
 738
 739         if (mark_our_ref(refname, sha1, flag, cb_data))
 740                 return 0;
 741
 742         if (capabilities)
 743                 packet_write(1, "%s %s%c%s%s agent=%s\n",
 744                              sha1_to_hex(sha1), refname_nons,
 745                              0, capabilities,
 746                              stateless_rpc ? " no-done" : "",
 747                              git_user_agent_sanitized());
 748         else
 749                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 750         capabilities = NULL;
 751         if (!peel_ref(refname, peeled))
 752                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 753         return 0;
 754 }
 755
 756 static void upload_pack(void)
 757 {
 758         if (advertise_refs || !stateless_rpc) {
 759                 reset_timeout();
 760                 head_ref_namespaced(send_ref, NULL);
 761                 for_each_namespaced_ref(send_ref, NULL);
 762                 packet_flush(1);
 763         } else {
 764                 head_ref_namespaced(mark_our_ref, NULL);
 765                 for_each_namespaced_ref(mark_our_ref, NULL);
 766         }
 767         if (advertise_refs)
 768                 return;
 769
 770         receive_needs();
 771         if (want_obj.nr) {
 772                 get_common_commits();
 773                 create_pack_file();
 774         }
 775 }
 776
 777 static int upload_pack_config(const char *var, const char *value, void *unused)
 778 {
 779         return parse_hide_refs_config(var, value, "uploadpack");
 780 }
 781
 782 int main(int argc, char **argv)
 783 {
 784         char *dir;
 785         int i;
 786         int strict = 0;
 787
 788         git_setup_gettext();
 789
 790         packet_trace_identity("upload-pack");
 791         git_extract_argv0_path(argv[0]);
 792         read_replace_refs = 0;
 793
 794         for (i = 1; i < argc; i++) {
 795                 char *arg = argv[i];
 796
 797                 if (arg[0] != '-')
 798                         break;
 799                 if (!strcmp(arg, "--advertise-refs")) {
 800                         advertise_refs = 1;
 801                         continue;
 802                 }
 803                 if (!strcmp(arg, "--stateless-rpc")) {
 804                         stateless_rpc = 1;
 805                         continue;
 806                 }
 807                 if (!strcmp(arg, "--strict")) {
 808                         strict = 1;
 809                         continue;
 810                 }
 811                 if (!prefixcmp(arg, "--timeout=")) {
 812                         timeout = atoi(arg+10);
 813                         daemon_mode = 1;
 814                         continue;
 815                 }
 816                 if (!strcmp(arg, "--")) {
 817                         i++;
 818                         break;
 819                 }
 820         }
 821
 822         if (i != argc-1)
 823                 usage(upload_pack_usage);
 824
 825         setup_path();
 826
 827         dir = argv[i];
 828
 829         if (!enter_repo(dir, strict))
 830                 die("'%s' does not appear to be a git repository", dir);
 831         if (is_repository_shallow())
 832                 die("attempt to fetch/clone from a shallow repository");
 833         git_config(upload_pack_config, NULL);
 834         upload_pack();
 835         return 0;
 836 }