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 "connect.h"
  14 #include "sigchain.h"
  15 #include "version.h"
  16 #include "string-list.h"
  17
  18 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  19
  20 /* bits #0..7 in revision.h, #8..10 in commit.c */
  21 #define THEY_HAVE       (1u << 11)
  22 #define OUR_REF         (1u << 12)
  23 #define WANTED          (1u << 13)
  24 #define COMMON_KNOWN    (1u << 14)
  25 #define REACHABLE       (1u << 15)
  26
  27 #define SHALLOW         (1u << 16)
  28 #define NOT_SHALLOW     (1u << 17)
  29 #define CLIENT_SHALLOW  (1u << 18)
  30 #define HIDDEN_REF      (1u << 19)
  31
  32 static unsigned long oldest_have;
  33
  34 static int multi_ack;
  35 static int no_done;
  36 static int use_thin_pack, use_ofs_delta, use_include_tag;
  37 static int no_progress, daemon_mode;
  38 static int allow_tip_sha1_in_want;
  39 static int shallow_nr;
  40 static struct object_array have_obj;
  41 static struct object_array want_obj;
  42 static struct object_array extra_edge_obj;
  43 static unsigned int timeout;
  44 /* 0 for no sideband,
  45  * otherwise maximum packet size (up to 65520 bytes).
  46  */
  47 static int use_sideband;
  48 static int advertise_refs;
  49 static int stateless_rpc;
  50
  51 static void reset_timeout(void)
  52 {
  53         alarm(timeout);
  54 }
  55
  56 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  57 {
  58         if (use_sideband)
  59                 return send_sideband(1, fd, data, sz, use_sideband);
  60         if (fd == 3)
  61                 /* emergency quit */
  62                 fd = 2;
  63         if (fd == 2) {
  64                 /* XXX: are we happy to lose stuff here? */
  65                 xwrite(fd, data, sz);
  66                 return sz;
  67         }
  68         write_or_die(fd, data, sz);
  69         return sz;
  70 }
  71
  72 static void create_pack_file(void)
  73 {
  74         struct child_process pack_objects;
  75         char data[8193], progress[128];
  76         char abort_msg[] = "aborting due to possible repository "
  77                 "corruption on the remote side.";
  78         int buffered = -1;
  79         ssize_t sz;
  80         const char *argv[12];
  81         int i, arg = 0;
  82         FILE *pipe_fd;
  83         char *shallow_file = NULL;
  84
  85         if (shallow_nr) {
  86                 shallow_file = setup_temporary_shallow();
  87                 argv[arg++] = "--shallow-file";
  88                 argv[arg++] = shallow_file;
  89         }
  90         argv[arg++] = "pack-objects";
  91         argv[arg++] = "--revs";
  92         if (use_thin_pack)
  93                 argv[arg++] = "--thin";
  94
  95         argv[arg++] = "--stdout";
  96         if (!no_progress)
  97                 argv[arg++] = "--progress";
  98         if (use_ofs_delta)
  99                 argv[arg++] = "--delta-base-offset";
 100         if (use_include_tag)
 101                 argv[arg++] = "--include-tag";
 102         argv[arg++] = NULL;
 103
 104         memset(&pack_objects, 0, sizeof(pack_objects));
 105         pack_objects.in = -1;
 106         pack_objects.out = -1;
 107         pack_objects.err = -1;
 108         pack_objects.git_cmd = 1;
 109         pack_objects.argv = argv;
 110
 111         if (start_command(&pack_objects))
 112                 die("git upload-pack: unable to fork git-pack-objects");
 113
 114         pipe_fd = xfdopen(pack_objects.in, "w");
 115
 116         for (i = 0; i < want_obj.nr; i++)
 117                 fprintf(pipe_fd, "%s\n",
 118                         sha1_to_hex(want_obj.objects[i].item->sha1));
 119         fprintf(pipe_fd, "--not\n");
 120         for (i = 0; i < have_obj.nr; i++)
 121                 fprintf(pipe_fd, "%s\n",
 122                         sha1_to_hex(have_obj.objects[i].item->sha1));
 123         for (i = 0; i < extra_edge_obj.nr; i++)
 124                 fprintf(pipe_fd, "%s\n",
 125                         sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
 126         fprintf(pipe_fd, "\n");
 127         fflush(pipe_fd);
 128         fclose(pipe_fd);
 129
 130         /* We read from pack_objects.err to capture stderr output for
 131          * progress bar, and pack_objects.out to capture the pack data.
 132          */
 133
 134         while (1) {
 135                 struct pollfd pfd[2];
 136                 int pe, pu, pollsize;
 137
 138                 reset_timeout();
 139
 140                 pollsize = 0;
 141                 pe = pu = -1;
 142
 143                 if (0 <= pack_objects.out) {
 144                         pfd[pollsize].fd = pack_objects.out;
 145                         pfd[pollsize].events = POLLIN;
 146                         pu = pollsize;
 147                         pollsize++;
 148                 }
 149                 if (0 <= pack_objects.err) {
 150                         pfd[pollsize].fd = pack_objects.err;
 151                         pfd[pollsize].events = POLLIN;
 152                         pe = pollsize;
 153                         pollsize++;
 154                 }
 155
 156                 if (!pollsize)
 157                         break;
 158
 159                 if (poll(pfd, pollsize, -1) < 0) {
 160                         if (errno != EINTR) {
 161                                 error("poll failed, resuming: %s",
 162                                       strerror(errno));
 163                                 sleep(1);
 164                         }
 165                         continue;
 166                 }
 167                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 168                         /* Status ready; we ship that in the side-band
 169                          * or dump to the standard error.
 170                          */
 171                         sz = xread(pack_objects.err, progress,
 172                                   sizeof(progress));
 173                         if (0 < sz)
 174                                 send_client_data(2, progress, sz);
 175                         else if (sz == 0) {
 176                                 close(pack_objects.err);
 177                                 pack_objects.err = -1;
 178                         }
 179                         else
 180                                 goto fail;
 181                         /* give priority to status messages */
 182                         continue;
 183                 }
 184                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 185                         /* Data ready; we keep the last byte to ourselves
 186                          * in case we detect broken rev-list, so that we
 187                          * can leave the stream corrupted.  This is
 188                          * unfortunate -- unpack-objects would happily
 189                          * accept a valid packdata with trailing garbage,
 190                          * so appending garbage after we pass all the
 191                          * pack data is not good enough to signal
 192                          * breakage to downstream.
 193                          */
 194                         char *cp = data;
 195                         ssize_t outsz = 0;
 196                         if (0 <= buffered) {
 197                                 *cp++ = buffered;
 198                                 outsz++;
 199                         }
 200                         sz = xread(pack_objects.out, cp,
 201                                   sizeof(data) - outsz);
 202                         if (0 < sz)
 203                                 ;
 204                         else if (sz == 0) {
 205                                 close(pack_objects.out);
 206                                 pack_objects.out = -1;
 207                         }
 208                         else
 209                                 goto fail;
 210                         sz += outsz;
 211                         if (1 < sz) {
 212                                 buffered = data[sz-1] & 0xFF;
 213                                 sz--;
 214                         }
 215                         else
 216                                 buffered = -1;
 217                         sz = send_client_data(1, data, sz);
 218                         if (sz < 0)
 219                                 goto fail;
 220                 }
 221         }
 222
 223         if (finish_command(&pack_objects)) {
 224                 error("git upload-pack: git-pack-objects died with error.");
 225                 goto fail;
 226         }
 227         if (shallow_file) {
 228                 if (*shallow_file)
 229                         unlink(shallow_file);
 230                 free(shallow_file);
 231         }
 232
 233         /* flush the data */
 234         if (0 <= buffered) {
 235                 data[0] = buffered;
 236                 sz = send_client_data(1, data, 1);
 237                 if (sz < 0)
 238                         goto fail;
 239                 fprintf(stderr, "flushed.\n");
 240         }
 241         if (use_sideband)
 242                 packet_flush(1);
 243         return;
 244
 245  fail:
 246         send_client_data(3, abort_msg, sizeof(abort_msg));
 247         die("git upload-pack: %s", abort_msg);
 248 }
 249
 250 static int got_sha1(char *hex, unsigned char *sha1)
 251 {
 252         struct object *o;
 253         int we_knew_they_have = 0;
 254
 255         if (get_sha1_hex(hex, sha1))
 256                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 257         if (!has_sha1_file(sha1))
 258                 return -1;
 259
 260         o = parse_object(sha1);
 261         if (!o)
 262                 die("oops (%s)", sha1_to_hex(sha1));
 263         if (o->type == OBJ_COMMIT) {
 264                 struct commit_list *parents;
 265                 struct commit *commit = (struct commit *)o;
 266                 if (o->flags & THEY_HAVE)
 267                         we_knew_they_have = 1;
 268                 else
 269                         o->flags |= THEY_HAVE;
 270                 if (!oldest_have || (commit->date < oldest_have))
 271                         oldest_have = commit->date;
 272                 for (parents = commit->parents;
 273                      parents;
 274                      parents = parents->next)
 275                         parents->item->object.flags |= THEY_HAVE;
 276         }
 277         if (!we_knew_they_have) {
 278                 add_object_array(o, NULL, &have_obj);
 279                 return 1;
 280         }
 281         return 0;
 282 }
 283
 284 static int reachable(struct commit *want)
 285 {
 286         struct commit_list *work = NULL;
 287
 288         commit_list_insert_by_date(want, &work);
 289         while (work) {
 290                 struct commit_list *list = work->next;
 291                 struct commit *commit = work->item;
 292                 free(work);
 293                 work = list;
 294
 295                 if (commit->object.flags & THEY_HAVE) {
 296                         want->object.flags |= COMMON_KNOWN;
 297                         break;
 298                 }
 299                 if (!commit->object.parsed)
 300                         parse_object(commit->object.sha1);
 301                 if (commit->object.flags & REACHABLE)
 302                         continue;
 303                 commit->object.flags |= REACHABLE;
 304                 if (commit->date < oldest_have)
 305                         continue;
 306                 for (list = commit->parents; list; list = list->next) {
 307                         struct commit *parent = list->item;
 308                         if (!(parent->object.flags & REACHABLE))
 309                                 commit_list_insert_by_date(parent, &work);
 310                 }
 311         }
 312         want->object.flags |= REACHABLE;
 313         clear_commit_marks(want, REACHABLE);
 314         free_commit_list(work);
 315         return (want->object.flags & COMMON_KNOWN);
 316 }
 317
 318 static int ok_to_give_up(void)
 319 {
 320         int i;
 321
 322         if (!have_obj.nr)
 323                 return 0;
 324
 325         for (i = 0; i < want_obj.nr; i++) {
 326                 struct object *want = want_obj.objects[i].item;
 327
 328                 if (want->flags & COMMON_KNOWN)
 329                         continue;
 330                 want = deref_tag(want, "a want line", 0);
 331                 if (!want || want->type != OBJ_COMMIT) {
 332                         /* no way to tell if this is reachable by
 333                          * looking at the ancestry chain alone, so
 334                          * leave a note to ourselves not to worry about
 335                          * this object anymore.
 336                          */
 337                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 338                         continue;
 339                 }
 340                 if (!reachable((struct commit *)want))
 341                         return 0;
 342         }
 343         return 1;
 344 }
 345
 346 static int get_common_commits(void)
 347 {
 348         unsigned char sha1[20];
 349         char last_hex[41];
 350         int got_common = 0;
 351         int got_other = 0;
 352         int sent_ready = 0;
 353
 354         save_commit_buffer = 0;
 355
 356         for (;;) {
 357                 char *line = packet_read_line(0, NULL);
 358                 reset_timeout();
 359
 360                 if (!line) {
 361                         if (multi_ack == 2 && got_common
 362                             && !got_other && ok_to_give_up()) {
 363                                 sent_ready = 1;
 364                                 packet_write(1, "ACK %s ready\n", last_hex);
 365                         }
 366                         if (have_obj.nr == 0 || multi_ack)
 367                                 packet_write(1, "NAK\n");
 368
 369                         if (no_done && sent_ready) {
 370                                 packet_write(1, "ACK %s\n", last_hex);
 371                                 return 0;
 372                         }
 373                         if (stateless_rpc)
 374                                 exit(0);
 375                         got_common = 0;
 376                         got_other = 0;
 377                         continue;
 378                 }
 379                 if (!prefixcmp(line, "have ")) {
 380                         switch (got_sha1(line+5, sha1)) {
 381                         case -1: /* they have what we do not */
 382                                 got_other = 1;
 383                                 if (multi_ack && ok_to_give_up()) {
 384                                         const char *hex = sha1_to_hex(sha1);
 385                                         if (multi_ack == 2) {
 386                                                 sent_ready = 1;
 387                                                 packet_write(1, "ACK %s ready\n", hex);
 388                                         } else
 389                                                 packet_write(1, "ACK %s continue\n", hex);
 390                                 }
 391                                 break;
 392                         default:
 393                                 got_common = 1;
 394                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 395                                 if (multi_ack == 2)
 396                                         packet_write(1, "ACK %s common\n", last_hex);
 397                                 else if (multi_ack)
 398                                         packet_write(1, "ACK %s continue\n", last_hex);
 399                                 else if (have_obj.nr == 1)
 400                                         packet_write(1, "ACK %s\n", last_hex);
 401                                 break;
 402                         }
 403                         continue;
 404                 }
 405                 if (!strcmp(line, "done")) {
 406                         if (have_obj.nr > 0) {
 407                                 if (multi_ack)
 408                                         packet_write(1, "ACK %s\n", last_hex);
 409                                 return 0;
 410                         }
 411                         packet_write(1, "NAK\n");
 412                         return -1;
 413                 }
 414                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 415         }
 416 }
 417
 418 static int is_our_ref(struct object *o)
 419 {
 420         return o->flags &
 421                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 422 }
 423
 424 static void check_non_tip(void)
 425 {
 426         static const char *argv[] = {
 427                 "rev-list", "--stdin", NULL,
 428         };
 429         static struct child_process cmd;
 430         struct object *o;
 431         char namebuf[42]; /* ^ + SHA-1 + LF */
 432         int i;
 433
 434         /* In the normal in-process case non-tip request can never happen */
 435         if (!stateless_rpc)
 436                 goto error;
 437
 438         cmd.argv = argv;
 439         cmd.git_cmd = 1;
 440         cmd.no_stderr = 1;
 441         cmd.in = -1;
 442         cmd.out = -1;
 443
 444         if (start_command(&cmd))
 445                 goto error;
 446
 447         /*
 448          * If rev-list --stdin encounters an unknown commit, it
 449          * terminates, which will cause SIGPIPE in the write loop
 450          * below.
 451          */
 452         sigchain_push(SIGPIPE, SIG_IGN);
 453
 454         namebuf[0] = '^';
 455         namebuf[41] = '\n';
 456         for (i = get_max_object_index(); 0 < i; ) {
 457                 o = get_indexed_object(--i);
 458                 if (!o)
 459                         continue;
 460                 if (!is_our_ref(o))
 461                         continue;
 462                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 463                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 464                         goto error;
 465         }
 466         namebuf[40] = '\n';
 467         for (i = 0; i < want_obj.nr; i++) {
 468                 o = want_obj.objects[i].item;
 469                 if (is_our_ref(o))
 470                         continue;
 471                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 472                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 473                         goto error;
 474         }
 475         close(cmd.in);
 476
 477         sigchain_pop(SIGPIPE);
 478
 479         /*
 480          * The commits out of the rev-list are not ancestors of
 481          * our ref.
 482          */
 483         i = read_in_full(cmd.out, namebuf, 1);
 484         if (i)
 485                 goto error;
 486         close(cmd.out);
 487
 488         /*
 489          * rev-list may have died by encountering a bad commit
 490          * in the history, in which case we do want to bail out
 491          * even when it showed no commit.
 492          */
 493         if (finish_command(&cmd))
 494                 goto error;
 495
 496         /* All the non-tip ones are ancestors of what we advertised */
 497         return;
 498
 499 error:
 500         /* Pick one of them (we know there at least is one) */
 501         for (i = 0; i < want_obj.nr; i++) {
 502                 o = want_obj.objects[i].item;
 503                 if (!is_our_ref(o))
 504                         die("git upload-pack: not our ref %s",
 505                             sha1_to_hex(o->sha1));
 506         }
 507 }
 508
 509 static void receive_needs(void)
 510 {
 511         struct object_array shallows = OBJECT_ARRAY_INIT;
 512         int depth = 0;
 513         int has_non_tip = 0;
 514
 515         shallow_nr = 0;
 516         for (;;) {
 517                 struct object *o;
 518                 const char *features;
 519                 unsigned char sha1_buf[20];
 520                 char *line = packet_read_line(0, NULL);
 521                 reset_timeout();
 522                 if (!line)
 523                         break;
 524
 525                 if (!prefixcmp(line, "shallow ")) {
 526                         unsigned char sha1[20];
 527                         struct object *object;
 528                         if (get_sha1_hex(line + 8, sha1))
 529                                 die("invalid shallow line: %s", line);
 530                         object = parse_object(sha1);
 531                         if (!object)
 532                                 continue;
 533                         if (object->type != OBJ_COMMIT)
 534                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 535                         if (!(object->flags & CLIENT_SHALLOW)) {
 536                                 object->flags |= CLIENT_SHALLOW;
 537                                 add_object_array(object, NULL, &shallows);
 538                         }
 539                         continue;
 540                 }
 541                 if (!prefixcmp(line, "deepen ")) {
 542                         char *end;
 543                         depth = strtol(line + 7, &end, 0);
 544                         if (end == line + 7 || depth <= 0)
 545                                 die("Invalid deepen: %s", line);
 546                         continue;
 547                 }
 548                 if (prefixcmp(line, "want ") ||
 549                     get_sha1_hex(line+5, sha1_buf))
 550                         die("git upload-pack: protocol error, "
 551                             "expected to get sha, not '%s'", line);
 552
 553                 features = line + 45;
 554
 555                 if (parse_feature_request(features, "multi_ack_detailed"))
 556                         multi_ack = 2;
 557                 else if (parse_feature_request(features, "multi_ack"))
 558                         multi_ack = 1;
 559                 if (parse_feature_request(features, "no-done"))
 560                         no_done = 1;
 561                 if (parse_feature_request(features, "thin-pack"))
 562                         use_thin_pack = 1;
 563                 if (parse_feature_request(features, "ofs-delta"))
 564                         use_ofs_delta = 1;
 565                 if (parse_feature_request(features, "side-band-64k"))
 566                         use_sideband = LARGE_PACKET_MAX;
 567                 else if (parse_feature_request(features, "side-band"))
 568                         use_sideband = DEFAULT_PACKET_MAX;
 569                 if (parse_feature_request(features, "no-progress"))
 570                         no_progress = 1;
 571                 if (parse_feature_request(features, "include-tag"))
 572                         use_include_tag = 1;
 573
 574                 o = parse_object(sha1_buf);
 575                 if (!o)
 576                         die("git upload-pack: not our ref %s",
 577                             sha1_to_hex(sha1_buf));
 578                 if (!(o->flags & WANTED)) {
 579                         o->flags |= WANTED;
 580                         if (!is_our_ref(o))
 581                                 has_non_tip = 1;
 582                         add_object_array(o, NULL, &want_obj);
 583                 }
 584         }
 585
 586         /*
 587          * We have sent all our refs already, and the other end
 588          * should have chosen out of them. When we are operating
 589          * in the stateless RPC mode, however, their choice may
 590          * have been based on the set of older refs advertised
 591          * by another process that handled the initial request.
 592          */
 593         if (has_non_tip)
 594                 check_non_tip();
 595
 596         if (!use_sideband && daemon_mode)
 597                 no_progress = 1;
 598
 599         if (depth == 0 && shallows.nr == 0)
 600                 return;
 601         if (depth > 0) {
 602                 struct commit_list *result = NULL, *backup = NULL;
 603                 int i;
 604                 if (depth == INFINITE_DEPTH)
 605                         for (i = 0; i < shallows.nr; i++) {
 606                                 struct object *object = shallows.objects[i].item;
 607                                 object->flags |= NOT_SHALLOW;
 608                         }
 609                 else
 610                         backup = result =
 611                                 get_shallow_commits(&want_obj, depth,
 612                                                     SHALLOW, NOT_SHALLOW);
 613                 while (result) {
 614                         struct object *object = &result->item->object;
 615                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 616                                 packet_write(1, "shallow %s",
 617                                                 sha1_to_hex(object->sha1));
 618                                 register_shallow(object->sha1);
 619                                 shallow_nr++;
 620                         }
 621                         result = result->next;
 622                 }
 623                 free_commit_list(backup);
 624                 for (i = 0; i < shallows.nr; i++) {
 625                         struct object *object = shallows.objects[i].item;
 626                         if (object->flags & NOT_SHALLOW) {
 627                                 struct commit_list *parents;
 628                                 packet_write(1, "unshallow %s",
 629                                         sha1_to_hex(object->sha1));
 630                                 object->flags &= ~CLIENT_SHALLOW;
 631                                 /* make sure the real parents are parsed */
 632                                 unregister_shallow(object->sha1);
 633                                 object->parsed = 0;
 634                                 if (parse_commit((struct commit *)object))
 635                                         die("invalid commit");
 636                                 parents = ((struct commit *)object)->parents;
 637                                 while (parents) {
 638                                         add_object_array(&parents->item->object,
 639                                                         NULL, &want_obj);
 640                                         parents = parents->next;
 641                                 }
 642                                 add_object_array(object, NULL, &extra_edge_obj);
 643                         }
 644                         /* make sure commit traversal conforms to client */
 645                         register_shallow(object->sha1);
 646                 }
 647                 packet_flush(1);
 648         } else
 649                 if (shallows.nr > 0) {
 650                         int i;
 651                         for (i = 0; i < shallows.nr; i++)
 652                                 register_shallow(shallows.objects[i].item->sha1);
 653                 }
 654
 655         shallow_nr += shallows.nr;
 656         free(shallows.objects);
 657 }
 658
 659 /* return non-zero if the ref is hidden, otherwise 0 */
 660 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 661 {
 662         struct object *o = lookup_unknown_object(sha1);
 663
 664         if (ref_is_hidden(refname)) {
 665                 o->flags |= HIDDEN_REF;
 666                 return 1;
 667         }
 668         if (!o)
 669                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 670         o->flags |= OUR_REF;
 671         return 0;
 672 }
 673
 674 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 675 {
 676         static const char *capabilities = "multi_ack thin-pack side-band"
 677                 " side-band-64k ofs-delta shallow no-progress"
 678                 " include-tag multi_ack_detailed";
 679         const char *refname_nons = strip_namespace(refname);
 680         unsigned char peeled[20];
 681
 682         if (mark_our_ref(refname, sha1, flag, cb_data))
 683                 return 0;
 684
 685         if (capabilities)
 686                 packet_write(1, "%s %s%c%s%s%s agent=%s\n",
 687                              sha1_to_hex(sha1), refname_nons,
 688                              0, capabilities,
 689                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 690                              stateless_rpc ? " no-done" : "",
 691                              git_user_agent_sanitized());
 692         else
 693                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 694         capabilities = NULL;
 695         if (!peel_ref(refname, peeled))
 696                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 697         return 0;
 698 }
 699
 700 static void upload_pack(void)
 701 {
 702         if (advertise_refs || !stateless_rpc) {
 703                 reset_timeout();
 704                 head_ref_namespaced(send_ref, NULL);
 705                 for_each_namespaced_ref(send_ref, NULL);
 706                 packet_flush(1);
 707         } else {
 708                 head_ref_namespaced(mark_our_ref, NULL);
 709                 for_each_namespaced_ref(mark_our_ref, NULL);
 710         }
 711         if (advertise_refs)
 712                 return;
 713
 714         receive_needs();
 715         if (want_obj.nr) {
 716                 get_common_commits();
 717                 create_pack_file();
 718         }
 719 }
 720
 721 static int upload_pack_config(const char *var, const char *value, void *unused)
 722 {
 723         if (!strcmp("uploadpack.allowtipsha1inwant", var))
 724                 allow_tip_sha1_in_want = git_config_bool(var, value);
 725         return parse_hide_refs_config(var, value, "uploadpack");
 726 }
 727
 728 int main(int argc, char **argv)
 729 {
 730         char *dir;
 731         int i;
 732         int strict = 0;
 733
 734         git_setup_gettext();
 735
 736         packet_trace_identity("upload-pack");
 737         git_extract_argv0_path(argv[0]);
 738         read_replace_refs = 0;
 739
 740         for (i = 1; i < argc; i++) {
 741                 char *arg = argv[i];
 742
 743                 if (arg[0] != '-')
 744                         break;
 745                 if (!strcmp(arg, "--advertise-refs")) {
 746                         advertise_refs = 1;
 747                         continue;
 748                 }
 749                 if (!strcmp(arg, "--stateless-rpc")) {
 750                         stateless_rpc = 1;
 751                         continue;
 752                 }
 753                 if (!strcmp(arg, "--strict")) {
 754                         strict = 1;
 755                         continue;
 756                 }
 757                 if (!prefixcmp(arg, "--timeout=")) {
 758                         timeout = atoi(arg+10);
 759                         daemon_mode = 1;
 760                         continue;
 761                 }
 762                 if (!strcmp(arg, "--")) {
 763                         i++;
 764                         break;
 765                 }
 766         }
 767
 768         if (i != argc-1)
 769                 usage(upload_pack_usage);
 770
 771         setup_path();
 772
 773         dir = argv[i];
 774
 775         if (!enter_repo(dir, strict))
 776                 die("'%s' does not appear to be a git repository", dir);
 777         if (is_repository_shallow())
 778                 die("attempt to fetch/clone from a shallow repository");
 779         git_config(upload_pack_config, NULL);
 780         upload_pack();
 781         return 0;
 782 }