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 #define HIDDEN_REF      (1u << 19)
  30
  31 static unsigned long oldest_have;
  32
  33 static int multi_ack;
  34 static int no_done;
  35 static int use_thin_pack, use_ofs_delta, use_include_tag;
  36 static int no_progress, daemon_mode;
  37 static int allow_tip_sha1_in_want;
  38 static int shallow_nr;
  39 static struct object_array have_obj;
  40 static struct object_array want_obj;
  41 static struct object_array extra_edge_obj;
  42 static unsigned int timeout;
  43 /* 0 for no sideband,
  44  * otherwise maximum packet size (up to 65520 bytes).
  45  */
  46 static int use_sideband;
  47 static int advertise_refs;
  48 static int stateless_rpc;
  49
  50 static void reset_timeout(void)
  51 {
  52         alarm(timeout);
  53 }
  54
  55 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  56 {
  57         if (use_sideband)
  58                 return send_sideband(1, fd, data, sz, use_sideband);
  59         if (fd == 3)
  60                 /* emergency quit */
  61                 fd = 2;
  62         if (fd == 2) {
  63                 /* XXX: are we happy to lose stuff here? */
  64                 xwrite(fd, data, sz);
  65                 return sz;
  66         }
  67         write_or_die(fd, data, sz);
  68         return sz;
  69 }
  70
  71 static void create_pack_file(void)
  72 {
  73         struct child_process pack_objects;
  74         char data[8193], progress[128];
  75         char abort_msg[] = "aborting due to possible repository "
  76                 "corruption on the remote side.";
  77         int buffered = -1;
  78         ssize_t sz;
  79         const char *argv[12];
  80         int i, arg = 0;
  81         FILE *pipe_fd;
  82         char *shallow_file = NULL;
  83
  84         if (shallow_nr) {
  85                 shallow_file = setup_temporary_shallow();
  86                 argv[arg++] = "--shallow-file";
  87                 argv[arg++] = shallow_file;
  88         }
  89         argv[arg++] = "pack-objects";
  90         argv[arg++] = "--revs";
  91         if (use_thin_pack)
  92                 argv[arg++] = "--thin";
  93
  94         argv[arg++] = "--stdout";
  95         if (!no_progress)
  96                 argv[arg++] = "--progress";
  97         if (use_ofs_delta)
  98                 argv[arg++] = "--delta-base-offset";
  99         if (use_include_tag)
 100                 argv[arg++] = "--include-tag";
 101         argv[arg++] = NULL;
 102
 103         memset(&pack_objects, 0, sizeof(pack_objects));
 104         pack_objects.in = -1;
 105         pack_objects.out = -1;
 106         pack_objects.err = -1;
 107         pack_objects.git_cmd = 1;
 108         pack_objects.argv = argv;
 109
 110         if (start_command(&pack_objects))
 111                 die("git upload-pack: unable to fork git-pack-objects");
 112
 113         pipe_fd = xfdopen(pack_objects.in, "w");
 114
 115         for (i = 0; i < want_obj.nr; i++)
 116                 fprintf(pipe_fd, "%s\n",
 117                         sha1_to_hex(want_obj.objects[i].item->sha1));
 118         fprintf(pipe_fd, "--not\n");
 119         for (i = 0; i < have_obj.nr; i++)
 120                 fprintf(pipe_fd, "%s\n",
 121                         sha1_to_hex(have_obj.objects[i].item->sha1));
 122         for (i = 0; i < extra_edge_obj.nr; i++)
 123                 fprintf(pipe_fd, "%s\n",
 124                         sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
 125         fprintf(pipe_fd, "\n");
 126         fflush(pipe_fd);
 127         fclose(pipe_fd);
 128
 129         /* We read from pack_objects.err to capture stderr output for
 130          * progress bar, and pack_objects.out to capture the pack data.
 131          */
 132
 133         while (1) {
 134                 struct pollfd pfd[2];
 135                 int pe, pu, pollsize;
 136
 137                 reset_timeout();
 138
 139                 pollsize = 0;
 140                 pe = pu = -1;
 141
 142                 if (0 <= pack_objects.out) {
 143                         pfd[pollsize].fd = pack_objects.out;
 144                         pfd[pollsize].events = POLLIN;
 145                         pu = pollsize;
 146                         pollsize++;
 147                 }
 148                 if (0 <= pack_objects.err) {
 149                         pfd[pollsize].fd = pack_objects.err;
 150                         pfd[pollsize].events = POLLIN;
 151                         pe = pollsize;
 152                         pollsize++;
 153                 }
 154
 155                 if (!pollsize)
 156                         break;
 157
 158                 if (poll(pfd, pollsize, -1) < 0) {
 159                         if (errno != EINTR) {
 160                                 error("poll failed, resuming: %s",
 161                                       strerror(errno));
 162                                 sleep(1);
 163                         }
 164                         continue;
 165                 }
 166                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 167                         /* Status ready; we ship that in the side-band
 168                          * or dump to the standard error.
 169                          */
 170                         sz = xread(pack_objects.err, progress,
 171                                   sizeof(progress));
 172                         if (0 < sz)
 173                                 send_client_data(2, progress, sz);
 174                         else if (sz == 0) {
 175                                 close(pack_objects.err);
 176                                 pack_objects.err = -1;
 177                         }
 178                         else
 179                                 goto fail;
 180                         /* give priority to status messages */
 181                         continue;
 182                 }
 183                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 184                         /* Data ready; we keep the last byte to ourselves
 185                          * in case we detect broken rev-list, so that we
 186                          * can leave the stream corrupted.  This is
 187                          * unfortunate -- unpack-objects would happily
 188                          * accept a valid packdata with trailing garbage,
 189                          * so appending garbage after we pass all the
 190                          * pack data is not good enough to signal
 191                          * breakage to downstream.
 192                          */
 193                         char *cp = data;
 194                         ssize_t outsz = 0;
 195                         if (0 <= buffered) {
 196                                 *cp++ = buffered;
 197                                 outsz++;
 198                         }
 199                         sz = xread(pack_objects.out, cp,
 200                                   sizeof(data) - outsz);
 201                         if (0 < sz)
 202                                 ;
 203                         else if (sz == 0) {
 204                                 close(pack_objects.out);
 205                                 pack_objects.out = -1;
 206                         }
 207                         else
 208                                 goto fail;
 209                         sz += outsz;
 210                         if (1 < sz) {
 211                                 buffered = data[sz-1] & 0xFF;
 212                                 sz--;
 213                         }
 214                         else
 215                                 buffered = -1;
 216                         sz = send_client_data(1, data, sz);
 217                         if (sz < 0)
 218                                 goto fail;
 219                 }
 220         }
 221
 222         if (finish_command(&pack_objects)) {
 223                 error("git upload-pack: git-pack-objects died with error.");
 224                 goto fail;
 225         }
 226         if (shallow_file) {
 227                 if (*shallow_file)
 228                         unlink(shallow_file);
 229                 free(shallow_file);
 230         }
 231
 232         /* flush the data */
 233         if (0 <= buffered) {
 234                 data[0] = buffered;
 235                 sz = send_client_data(1, data, 1);
 236                 if (sz < 0)
 237                         goto fail;
 238                 fprintf(stderr, "flushed.\n");
 239         }
 240         if (use_sideband)
 241                 packet_flush(1);
 242         return;
 243
 244  fail:
 245         send_client_data(3, abort_msg, sizeof(abort_msg));
 246         die("git upload-pack: %s", abort_msg);
 247 }
 248
 249 static int got_sha1(char *hex, unsigned char *sha1)
 250 {
 251         struct object *o;
 252         int we_knew_they_have = 0;
 253
 254         if (get_sha1_hex(hex, sha1))
 255                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 256         if (!has_sha1_file(sha1))
 257                 return -1;
 258
 259         o = parse_object(sha1);
 260         if (!o)
 261                 die("oops (%s)", sha1_to_hex(sha1));
 262         if (o->type == OBJ_COMMIT) {
 263                 struct commit_list *parents;
 264                 struct commit *commit = (struct commit *)o;
 265                 if (o->flags & THEY_HAVE)
 266                         we_knew_they_have = 1;
 267                 else
 268                         o->flags |= THEY_HAVE;
 269                 if (!oldest_have || (commit->date < oldest_have))
 270                         oldest_have = commit->date;
 271                 for (parents = commit->parents;
 272                      parents;
 273                      parents = parents->next)
 274                         parents->item->object.flags |= THEY_HAVE;
 275         }
 276         if (!we_knew_they_have) {
 277                 add_object_array(o, NULL, &have_obj);
 278                 return 1;
 279         }
 280         return 0;
 281 }
 282
 283 static int reachable(struct commit *want)
 284 {
 285         struct commit_list *work = NULL;
 286
 287         commit_list_insert_by_date(want, &work);
 288         while (work) {
 289                 struct commit_list *list = work->next;
 290                 struct commit *commit = work->item;
 291                 free(work);
 292                 work = list;
 293
 294                 if (commit->object.flags & THEY_HAVE) {
 295                         want->object.flags |= COMMON_KNOWN;
 296                         break;
 297                 }
 298                 if (!commit->object.parsed)
 299                         parse_object(commit->object.sha1);
 300                 if (commit->object.flags & REACHABLE)
 301                         continue;
 302                 commit->object.flags |= REACHABLE;
 303                 if (commit->date < oldest_have)
 304                         continue;
 305                 for (list = commit->parents; list; list = list->next) {
 306                         struct commit *parent = list->item;
 307                         if (!(parent->object.flags & REACHABLE))
 308                                 commit_list_insert_by_date(parent, &work);
 309                 }
 310         }
 311         want->object.flags |= REACHABLE;
 312         clear_commit_marks(want, REACHABLE);
 313         free_commit_list(work);
 314         return (want->object.flags & COMMON_KNOWN);
 315 }
 316
 317 static int ok_to_give_up(void)
 318 {
 319         int i;
 320
 321         if (!have_obj.nr)
 322                 return 0;
 323
 324         for (i = 0; i < want_obj.nr; i++) {
 325                 struct object *want = want_obj.objects[i].item;
 326
 327                 if (want->flags & COMMON_KNOWN)
 328                         continue;
 329                 want = deref_tag(want, "a want line", 0);
 330                 if (!want || want->type != OBJ_COMMIT) {
 331                         /* no way to tell if this is reachable by
 332                          * looking at the ancestry chain alone, so
 333                          * leave a note to ourselves not to worry about
 334                          * this object anymore.
 335                          */
 336                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 337                         continue;
 338                 }
 339                 if (!reachable((struct commit *)want))
 340                         return 0;
 341         }
 342         return 1;
 343 }
 344
 345 static int get_common_commits(void)
 346 {
 347         unsigned char sha1[20];
 348         char last_hex[41];
 349         int got_common = 0;
 350         int got_other = 0;
 351         int sent_ready = 0;
 352
 353         save_commit_buffer = 0;
 354
 355         for (;;) {
 356                 char *line = packet_read_line(0, NULL);
 357                 reset_timeout();
 358
 359                 if (!line) {
 360                         if (multi_ack == 2 && got_common
 361                             && !got_other && ok_to_give_up()) {
 362                                 sent_ready = 1;
 363                                 packet_write(1, "ACK %s ready\n", last_hex);
 364                         }
 365                         if (have_obj.nr == 0 || multi_ack)
 366                                 packet_write(1, "NAK\n");
 367
 368                         if (no_done && sent_ready) {
 369                                 packet_write(1, "ACK %s\n", last_hex);
 370                                 return 0;
 371                         }
 372                         if (stateless_rpc)
 373                                 exit(0);
 374                         got_common = 0;
 375                         got_other = 0;
 376                         continue;
 377                 }
 378                 if (!prefixcmp(line, "have ")) {
 379                         switch (got_sha1(line+5, sha1)) {
 380                         case -1: /* they have what we do not */
 381                                 got_other = 1;
 382                                 if (multi_ack && ok_to_give_up()) {
 383                                         const char *hex = sha1_to_hex(sha1);
 384                                         if (multi_ack == 2) {
 385                                                 sent_ready = 1;
 386                                                 packet_write(1, "ACK %s ready\n", hex);
 387                                         } else
 388                                                 packet_write(1, "ACK %s continue\n", hex);
 389                                 }
 390                                 break;
 391                         default:
 392                                 got_common = 1;
 393                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 394                                 if (multi_ack == 2)
 395                                         packet_write(1, "ACK %s common\n", last_hex);
 396                                 else if (multi_ack)
 397                                         packet_write(1, "ACK %s continue\n", last_hex);
 398                                 else if (have_obj.nr == 1)
 399                                         packet_write(1, "ACK %s\n", last_hex);
 400                                 break;
 401                         }
 402                         continue;
 403                 }
 404                 if (!strcmp(line, "done")) {
 405                         if (have_obj.nr > 0) {
 406                                 if (multi_ack)
 407                                         packet_write(1, "ACK %s\n", last_hex);
 408                                 return 0;
 409                         }
 410                         packet_write(1, "NAK\n");
 411                         return -1;
 412                 }
 413                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 414         }
 415 }
 416
 417 static int is_our_ref(struct object *o)
 418 {
 419         return o->flags &
 420                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 421 }
 422
 423 static void check_non_tip(void)
 424 {
 425         static const char *argv[] = {
 426                 "rev-list", "--stdin", NULL,
 427         };
 428         static struct child_process cmd;
 429         struct object *o;
 430         char namebuf[42]; /* ^ + SHA-1 + LF */
 431         int i;
 432
 433         /* In the normal in-process case non-tip request can never happen */
 434         if (!stateless_rpc)
 435                 goto error;
 436
 437         cmd.argv = argv;
 438         cmd.git_cmd = 1;
 439         cmd.no_stderr = 1;
 440         cmd.in = -1;
 441         cmd.out = -1;
 442
 443         if (start_command(&cmd))
 444                 goto error;
 445
 446         /*
 447          * If rev-list --stdin encounters an unknown commit, it
 448          * terminates, which will cause SIGPIPE in the write loop
 449          * below.
 450          */
 451         sigchain_push(SIGPIPE, SIG_IGN);
 452
 453         namebuf[0] = '^';
 454         namebuf[41] = '\n';
 455         for (i = get_max_object_index(); 0 < i; ) {
 456                 o = get_indexed_object(--i);
 457                 if (!o)
 458                         continue;
 459                 if (!is_our_ref(o))
 460                         continue;
 461                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 462                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 463                         goto error;
 464         }
 465         namebuf[40] = '\n';
 466         for (i = 0; i < want_obj.nr; i++) {
 467                 o = want_obj.objects[i].item;
 468                 if (is_our_ref(o))
 469                         continue;
 470                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 471                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 472                         goto error;
 473         }
 474         close(cmd.in);
 475
 476         sigchain_pop(SIGPIPE);
 477
 478         /*
 479          * The commits out of the rev-list are not ancestors of
 480          * our ref.
 481          */
 482         i = read_in_full(cmd.out, namebuf, 1);
 483         if (i)
 484                 goto error;
 485         close(cmd.out);
 486
 487         /*
 488          * rev-list may have died by encountering a bad commit
 489          * in the history, in which case we do want to bail out
 490          * even when it showed no commit.
 491          */
 492         if (finish_command(&cmd))
 493                 goto error;
 494
 495         /* All the non-tip ones are ancestors of what we advertised */
 496         return;
 497
 498 error:
 499         /* Pick one of them (we know there at least is one) */
 500         for (i = 0; i < want_obj.nr; i++) {
 501                 o = want_obj.objects[i].item;
 502                 if (!is_our_ref(o))
 503                         die("git upload-pack: not our ref %s",
 504                             sha1_to_hex(o->sha1));
 505         }
 506 }
 507
 508 static void receive_needs(void)
 509 {
 510         struct object_array shallows = OBJECT_ARRAY_INIT;
 511         int depth = 0;
 512         int has_non_tip = 0;
 513
 514         shallow_nr = 0;
 515         for (;;) {
 516                 struct object *o;
 517                 const char *features;
 518                 unsigned char sha1_buf[20];
 519                 char *line = packet_read_line(0, NULL);
 520                 reset_timeout();
 521                 if (!line)
 522                         break;
 523
 524                 if (!prefixcmp(line, "shallow ")) {
 525                         unsigned char sha1[20];
 526                         struct object *object;
 527                         if (get_sha1_hex(line + 8, sha1))
 528                                 die("invalid shallow line: %s", line);
 529                         object = parse_object(sha1);
 530                         if (!object)
 531                                 continue;
 532                         if (object->type != OBJ_COMMIT)
 533                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 534                         if (!(object->flags & CLIENT_SHALLOW)) {
 535                                 object->flags |= CLIENT_SHALLOW;
 536                                 add_object_array(object, NULL, &shallows);
 537                         }
 538                         continue;
 539                 }
 540                 if (!prefixcmp(line, "deepen ")) {
 541                         char *end;
 542                         depth = strtol(line + 7, &end, 0);
 543                         if (end == line + 7 || depth <= 0)
 544                                 die("Invalid deepen: %s", line);
 545                         continue;
 546                 }
 547                 if (prefixcmp(line, "want ") ||
 548                     get_sha1_hex(line+5, sha1_buf))
 549                         die("git upload-pack: protocol error, "
 550                             "expected to get sha, not '%s'", line);
 551
 552                 features = line + 45;
 553
 554                 if (parse_feature_request(features, "multi_ack_detailed"))
 555                         multi_ack = 2;
 556                 else if (parse_feature_request(features, "multi_ack"))
 557                         multi_ack = 1;
 558                 if (parse_feature_request(features, "no-done"))
 559                         no_done = 1;
 560                 if (parse_feature_request(features, "thin-pack"))
 561                         use_thin_pack = 1;
 562                 if (parse_feature_request(features, "ofs-delta"))
 563                         use_ofs_delta = 1;
 564                 if (parse_feature_request(features, "side-band-64k"))
 565                         use_sideband = LARGE_PACKET_MAX;
 566                 else if (parse_feature_request(features, "side-band"))
 567                         use_sideband = DEFAULT_PACKET_MAX;
 568                 if (parse_feature_request(features, "no-progress"))
 569                         no_progress = 1;
 570                 if (parse_feature_request(features, "include-tag"))
 571                         use_include_tag = 1;
 572
 573                 o = parse_object(sha1_buf);
 574                 if (!o)
 575                         die("git upload-pack: not our ref %s",
 576                             sha1_to_hex(sha1_buf));
 577                 if (!(o->flags & WANTED)) {
 578                         o->flags |= WANTED;
 579                         if (!is_our_ref(o))
 580                                 has_non_tip = 1;
 581                         add_object_array(o, NULL, &want_obj);
 582                 }
 583         }
 584
 585         /*
 586          * We have sent all our refs already, and the other end
 587          * should have chosen out of them. When we are operating
 588          * in the stateless RPC mode, however, their choice may
 589          * have been based on the set of older refs advertised
 590          * by another process that handled the initial request.
 591          */
 592         if (has_non_tip)
 593                 check_non_tip();
 594
 595         if (!use_sideband && daemon_mode)
 596                 no_progress = 1;
 597
 598         if (depth == 0 && shallows.nr == 0)
 599                 return;
 600         if (depth > 0) {
 601                 struct commit_list *result = NULL, *backup = NULL;
 602                 int i;
 603                 if (depth == INFINITE_DEPTH)
 604                         for (i = 0; i < shallows.nr; i++) {
 605                                 struct object *object = shallows.objects[i].item;
 606                                 object->flags |= NOT_SHALLOW;
 607                         }
 608                 else
 609                         backup = result =
 610                                 get_shallow_commits(&want_obj, depth,
 611                                                     SHALLOW, NOT_SHALLOW);
 612                 while (result) {
 613                         struct object *object = &result->item->object;
 614                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 615                                 packet_write(1, "shallow %s",
 616                                                 sha1_to_hex(object->sha1));
 617                                 register_shallow(object->sha1);
 618                                 shallow_nr++;
 619                         }
 620                         result = result->next;
 621                 }
 622                 free_commit_list(backup);
 623                 for (i = 0; i < shallows.nr; i++) {
 624                         struct object *object = shallows.objects[i].item;
 625                         if (object->flags & NOT_SHALLOW) {
 626                                 struct commit_list *parents;
 627                                 packet_write(1, "unshallow %s",
 628                                         sha1_to_hex(object->sha1));
 629                                 object->flags &= ~CLIENT_SHALLOW;
 630                                 /* make sure the real parents are parsed */
 631                                 unregister_shallow(object->sha1);
 632                                 object->parsed = 0;
 633                                 if (parse_commit((struct commit *)object))
 634                                         die("invalid commit");
 635                                 parents = ((struct commit *)object)->parents;
 636                                 while (parents) {
 637                                         add_object_array(&parents->item->object,
 638                                                         NULL, &want_obj);
 639                                         parents = parents->next;
 640                                 }
 641                                 add_object_array(object, NULL, &extra_edge_obj);
 642                         }
 643                         /* make sure commit traversal conforms to client */
 644                         register_shallow(object->sha1);
 645                 }
 646                 packet_flush(1);
 647         } else
 648                 if (shallows.nr > 0) {
 649                         int i;
 650                         for (i = 0; i < shallows.nr; i++)
 651                                 register_shallow(shallows.objects[i].item->sha1);
 652                 }
 653
 654         shallow_nr += shallows.nr;
 655         free(shallows.objects);
 656 }
 657
 658 /* return non-zero if the ref is hidden, otherwise 0 */
 659 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 660 {
 661         struct object *o = lookup_unknown_object(sha1);
 662
 663         if (ref_is_hidden(refname)) {
 664                 o->flags |= HIDDEN_REF;
 665                 return 1;
 666         }
 667         if (!o)
 668                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 669         o->flags |= OUR_REF;
 670         return 0;
 671 }
 672
 673 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 674 {
 675         static const char *capabilities = "multi_ack thin-pack side-band"
 676                 " side-band-64k ofs-delta shallow no-progress"
 677                 " include-tag multi_ack_detailed";
 678         const char *refname_nons = strip_namespace(refname);
 679         unsigned char peeled[20];
 680
 681         if (mark_our_ref(refname, sha1, flag, cb_data))
 682                 return 0;
 683
 684         if (capabilities)
 685                 packet_write(1, "%s %s%c%s%s%s agent=%s\n",
 686                              sha1_to_hex(sha1), refname_nons,
 687                              0, capabilities,
 688                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 689                              stateless_rpc ? " no-done" : "",
 690                              git_user_agent_sanitized());
 691         else
 692                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 693         capabilities = NULL;
 694         if (!peel_ref(refname, peeled))
 695                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 696         return 0;
 697 }
 698
 699 static void upload_pack(void)
 700 {
 701         if (advertise_refs || !stateless_rpc) {
 702                 reset_timeout();
 703                 head_ref_namespaced(send_ref, NULL);
 704                 for_each_namespaced_ref(send_ref, NULL);
 705                 packet_flush(1);
 706         } else {
 707                 head_ref_namespaced(mark_our_ref, NULL);
 708                 for_each_namespaced_ref(mark_our_ref, NULL);
 709         }
 710         if (advertise_refs)
 711                 return;
 712
 713         receive_needs();
 714         if (want_obj.nr) {
 715                 get_common_commits();
 716                 create_pack_file();
 717         }
 718 }
 719
 720 static int upload_pack_config(const char *var, const char *value, void *unused)
 721 {
 722         if (!strcmp("uploadpack.allowtipsha1inwant", var))
 723                 allow_tip_sha1_in_want = git_config_bool(var, value);
 724         return parse_hide_refs_config(var, value, "uploadpack");
 725 }
 726
 727 int main(int argc, char **argv)
 728 {
 729         char *dir;
 730         int i;
 731         int strict = 0;
 732
 733         git_setup_gettext();
 734
 735         packet_trace_identity("upload-pack");
 736         git_extract_argv0_path(argv[0]);
 737         read_replace_refs = 0;
 738
 739         for (i = 1; i < argc; i++) {
 740                 char *arg = argv[i];
 741
 742                 if (arg[0] != '-')
 743                         break;
 744                 if (!strcmp(arg, "--advertise-refs")) {
 745                         advertise_refs = 1;
 746                         continue;
 747                 }
 748                 if (!strcmp(arg, "--stateless-rpc")) {
 749                         stateless_rpc = 1;
 750                         continue;
 751                 }
 752                 if (!strcmp(arg, "--strict")) {
 753                         strict = 1;
 754                         continue;
 755                 }
 756                 if (!prefixcmp(arg, "--timeout=")) {
 757                         timeout = atoi(arg+10);
 758                         daemon_mode = 1;
 759                         continue;
 760                 }
 761                 if (!strcmp(arg, "--")) {
 762                         i++;
 763                         break;
 764                 }
 765         }
 766
 767         if (i != argc-1)
 768                 usage(upload_pack_usage);
 769
 770         setup_path();
 771
 772         dir = argv[i];
 773
 774         if (!enter_repo(dir, strict))
 775                 die("'%s' does not appear to be a git repository", dir);
 776         if (is_repository_shallow())
 777                 die("attempt to fetch/clone from a shallow repository");
 778         git_config(upload_pack_config, NULL);
 779         upload_pack();
 780         return 0;
 781 }