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 static int keepalive = 5;
  45 /* 0 for no sideband,
  46  * otherwise maximum packet size (up to 65520 bytes).
  47  */
  48 static int use_sideband;
  49 static int advertise_refs;
  50 static int stateless_rpc;
  51
  52 static void reset_timeout(void)
  53 {
  54         alarm(timeout);
  55 }
  56
  57 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  58 {
  59         if (use_sideband)
  60                 return send_sideband(1, fd, data, sz, use_sideband);
  61         if (fd == 3)
  62                 /* emergency quit */
  63                 fd = 2;
  64         if (fd == 2) {
  65                 /* XXX: are we happy to lose stuff here? */
  66                 xwrite(fd, data, sz);
  67                 return sz;
  68         }
  69         write_or_die(fd, data, sz);
  70         return sz;
  71 }
  72
  73 static void create_pack_file(void)
  74 {
  75         struct child_process pack_objects;
  76         char data[8193], progress[128];
  77         char abort_msg[] = "aborting due to possible repository "
  78                 "corruption on the remote side.";
  79         int buffered = -1;
  80         ssize_t sz;
  81         const char *argv[12];
  82         int i, arg = 0;
  83         FILE *pipe_fd;
  84         const char *shallow_file = NULL;
  85
  86         if (shallow_nr) {
  87                 shallow_file = setup_temporary_shallow(NULL);
  88                 argv[arg++] = "--shallow-file";
  89                 argv[arg++] = shallow_file;
  90         }
  91         argv[arg++] = "pack-objects";
  92         argv[arg++] = "--revs";
  93         if (use_thin_pack)
  94                 argv[arg++] = "--thin";
  95
  96         argv[arg++] = "--stdout";
  97         if (!no_progress)
  98                 argv[arg++] = "--progress";
  99         if (use_ofs_delta)
 100                 argv[arg++] = "--delta-base-offset";
 101         if (use_include_tag)
 102                 argv[arg++] = "--include-tag";
 103         argv[arg++] = NULL;
 104
 105         memset(&pack_objects, 0, sizeof(pack_objects));
 106         pack_objects.in = -1;
 107         pack_objects.out = -1;
 108         pack_objects.err = -1;
 109         pack_objects.git_cmd = 1;
 110         pack_objects.argv = argv;
 111
 112         if (start_command(&pack_objects))
 113                 die("git upload-pack: unable to fork git-pack-objects");
 114
 115         pipe_fd = xfdopen(pack_objects.in, "w");
 116
 117         for (i = 0; i < want_obj.nr; i++)
 118                 fprintf(pipe_fd, "%s\n",
 119                         sha1_to_hex(want_obj.objects[i].item->sha1));
 120         fprintf(pipe_fd, "--not\n");
 121         for (i = 0; i < have_obj.nr; i++)
 122                 fprintf(pipe_fd, "%s\n",
 123                         sha1_to_hex(have_obj.objects[i].item->sha1));
 124         for (i = 0; i < extra_edge_obj.nr; i++)
 125                 fprintf(pipe_fd, "%s\n",
 126                         sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
 127         fprintf(pipe_fd, "\n");
 128         fflush(pipe_fd);
 129         fclose(pipe_fd);
 130
 131         /* We read from pack_objects.err to capture stderr output for
 132          * progress bar, and pack_objects.out to capture the pack data.
 133          */
 134
 135         while (1) {
 136                 struct pollfd pfd[2];
 137                 int pe, pu, pollsize;
 138                 int ret;
 139
 140                 reset_timeout();
 141
 142                 pollsize = 0;
 143                 pe = pu = -1;
 144
 145                 if (0 <= pack_objects.out) {
 146                         pfd[pollsize].fd = pack_objects.out;
 147                         pfd[pollsize].events = POLLIN;
 148                         pu = pollsize;
 149                         pollsize++;
 150                 }
 151                 if (0 <= pack_objects.err) {
 152                         pfd[pollsize].fd = pack_objects.err;
 153                         pfd[pollsize].events = POLLIN;
 154                         pe = pollsize;
 155                         pollsize++;
 156                 }
 157
 158                 if (!pollsize)
 159                         break;
 160
 161                 ret = poll(pfd, pollsize,
 162                         keepalive < 0 ? -1 : 1000 * keepalive);
 163
 164                 if (ret < 0) {
 165                         if (errno != EINTR) {
 166                                 error("poll failed, resuming: %s",
 167                                       strerror(errno));
 168                                 sleep(1);
 169                         }
 170                         continue;
 171                 }
 172                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 173                         /* Status ready; we ship that in the side-band
 174                          * or dump to the standard error.
 175                          */
 176                         sz = xread(pack_objects.err, progress,
 177                                   sizeof(progress));
 178                         if (0 < sz)
 179                                 send_client_data(2, progress, sz);
 180                         else if (sz == 0) {
 181                                 close(pack_objects.err);
 182                                 pack_objects.err = -1;
 183                         }
 184                         else
 185                                 goto fail;
 186                         /* give priority to status messages */
 187                         continue;
 188                 }
 189                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 190                         /* Data ready; we keep the last byte to ourselves
 191                          * in case we detect broken rev-list, so that we
 192                          * can leave the stream corrupted.  This is
 193                          * unfortunate -- unpack-objects would happily
 194                          * accept a valid packdata with trailing garbage,
 195                          * so appending garbage after we pass all the
 196                          * pack data is not good enough to signal
 197                          * breakage to downstream.
 198                          */
 199                         char *cp = data;
 200                         ssize_t outsz = 0;
 201                         if (0 <= buffered) {
 202                                 *cp++ = buffered;
 203                                 outsz++;
 204                         }
 205                         sz = xread(pack_objects.out, cp,
 206                                   sizeof(data) - outsz);
 207                         if (0 < sz)
 208                                 ;
 209                         else if (sz == 0) {
 210                                 close(pack_objects.out);
 211                                 pack_objects.out = -1;
 212                         }
 213                         else
 214                                 goto fail;
 215                         sz += outsz;
 216                         if (1 < sz) {
 217                                 buffered = data[sz-1] & 0xFF;
 218                                 sz--;
 219                         }
 220                         else
 221                                 buffered = -1;
 222                         sz = send_client_data(1, data, sz);
 223                         if (sz < 0)
 224                                 goto fail;
 225                 }
 226
 227                 /*
 228                  * We hit the keepalive timeout without saying anything; send
 229                  * an empty message on the data sideband just to let the other
 230                  * side know we're still working on it, but don't have any data
 231                  * yet.
 232                  *
 233                  * If we don't have a sideband channel, there's no room in the
 234                  * protocol to say anything, so those clients are just out of
 235                  * luck.
 236                  */
 237                 if (!ret && use_sideband) {
 238                         static const char buf[] = "0005\1";
 239                         write_or_die(1, buf, 5);
 240                 }
 241         }
 242
 243         if (finish_command(&pack_objects)) {
 244                 error("git upload-pack: git-pack-objects died with error.");
 245                 goto fail;
 246         }
 247
 248         /* flush the data */
 249         if (0 <= buffered) {
 250                 data[0] = buffered;
 251                 sz = send_client_data(1, data, 1);
 252                 if (sz < 0)
 253                         goto fail;
 254                 fprintf(stderr, "flushed.\n");
 255         }
 256         if (use_sideband)
 257                 packet_flush(1);
 258         return;
 259
 260  fail:
 261         send_client_data(3, abort_msg, sizeof(abort_msg));
 262         die("git upload-pack: %s", abort_msg);
 263 }
 264
 265 static int got_sha1(char *hex, unsigned char *sha1)
 266 {
 267         struct object *o;
 268         int we_knew_they_have = 0;
 269
 270         if (get_sha1_hex(hex, sha1))
 271                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 272         if (!has_sha1_file(sha1))
 273                 return -1;
 274
 275         o = parse_object(sha1);
 276         if (!o)
 277                 die("oops (%s)", sha1_to_hex(sha1));
 278         if (o->type == OBJ_COMMIT) {
 279                 struct commit_list *parents;
 280                 struct commit *commit = (struct commit *)o;
 281                 if (o->flags & THEY_HAVE)
 282                         we_knew_they_have = 1;
 283                 else
 284                         o->flags |= THEY_HAVE;
 285                 if (!oldest_have || (commit->date < oldest_have))
 286                         oldest_have = commit->date;
 287                 for (parents = commit->parents;
 288                      parents;
 289                      parents = parents->next)
 290                         parents->item->object.flags |= THEY_HAVE;
 291         }
 292         if (!we_knew_they_have) {
 293                 add_object_array(o, NULL, &have_obj);
 294                 return 1;
 295         }
 296         return 0;
 297 }
 298
 299 static int reachable(struct commit *want)
 300 {
 301         struct commit_list *work = NULL;
 302
 303         commit_list_insert_by_date(want, &work);
 304         while (work) {
 305                 struct commit_list *list = work->next;
 306                 struct commit *commit = work->item;
 307                 free(work);
 308                 work = list;
 309
 310                 if (commit->object.flags & THEY_HAVE) {
 311                         want->object.flags |= COMMON_KNOWN;
 312                         break;
 313                 }
 314                 if (!commit->object.parsed)
 315                         parse_object(commit->object.sha1);
 316                 if (commit->object.flags & REACHABLE)
 317                         continue;
 318                 commit->object.flags |= REACHABLE;
 319                 if (commit->date < oldest_have)
 320                         continue;
 321                 for (list = commit->parents; list; list = list->next) {
 322                         struct commit *parent = list->item;
 323                         if (!(parent->object.flags & REACHABLE))
 324                                 commit_list_insert_by_date(parent, &work);
 325                 }
 326         }
 327         want->object.flags |= REACHABLE;
 328         clear_commit_marks(want, REACHABLE);
 329         free_commit_list(work);
 330         return (want->object.flags & COMMON_KNOWN);
 331 }
 332
 333 static int ok_to_give_up(void)
 334 {
 335         int i;
 336
 337         if (!have_obj.nr)
 338                 return 0;
 339
 340         for (i = 0; i < want_obj.nr; i++) {
 341                 struct object *want = want_obj.objects[i].item;
 342
 343                 if (want->flags & COMMON_KNOWN)
 344                         continue;
 345                 want = deref_tag(want, "a want line", 0);
 346                 if (!want || want->type != OBJ_COMMIT) {
 347                         /* no way to tell if this is reachable by
 348                          * looking at the ancestry chain alone, so
 349                          * leave a note to ourselves not to worry about
 350                          * this object anymore.
 351                          */
 352                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 353                         continue;
 354                 }
 355                 if (!reachable((struct commit *)want))
 356                         return 0;
 357         }
 358         return 1;
 359 }
 360
 361 static int get_common_commits(void)
 362 {
 363         unsigned char sha1[20];
 364         char last_hex[41];
 365         int got_common = 0;
 366         int got_other = 0;
 367         int sent_ready = 0;
 368
 369         save_commit_buffer = 0;
 370
 371         for (;;) {
 372                 char *line = packet_read_line(0, NULL);
 373                 reset_timeout();
 374
 375                 if (!line) {
 376                         if (multi_ack == 2 && got_common
 377                             && !got_other && ok_to_give_up()) {
 378                                 sent_ready = 1;
 379                                 packet_write(1, "ACK %s ready\n", last_hex);
 380                         }
 381                         if (have_obj.nr == 0 || multi_ack)
 382                                 packet_write(1, "NAK\n");
 383
 384                         if (no_done && sent_ready) {
 385                                 packet_write(1, "ACK %s\n", last_hex);
 386                                 return 0;
 387                         }
 388                         if (stateless_rpc)
 389                                 exit(0);
 390                         got_common = 0;
 391                         got_other = 0;
 392                         continue;
 393                 }
 394                 if (starts_with(line, "have ")) {
 395                         switch (got_sha1(line+5, sha1)) {
 396                         case -1: /* they have what we do not */
 397                                 got_other = 1;
 398                                 if (multi_ack && ok_to_give_up()) {
 399                                         const char *hex = sha1_to_hex(sha1);
 400                                         if (multi_ack == 2) {
 401                                                 sent_ready = 1;
 402                                                 packet_write(1, "ACK %s ready\n", hex);
 403                                         } else
 404                                                 packet_write(1, "ACK %s continue\n", hex);
 405                                 }
 406                                 break;
 407                         default:
 408                                 got_common = 1;
 409                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 410                                 if (multi_ack == 2)
 411                                         packet_write(1, "ACK %s common\n", last_hex);
 412                                 else if (multi_ack)
 413                                         packet_write(1, "ACK %s continue\n", last_hex);
 414                                 else if (have_obj.nr == 1)
 415                                         packet_write(1, "ACK %s\n", last_hex);
 416                                 break;
 417                         }
 418                         continue;
 419                 }
 420                 if (!strcmp(line, "done")) {
 421                         if (have_obj.nr > 0) {
 422                                 if (multi_ack)
 423                                         packet_write(1, "ACK %s\n", last_hex);
 424                                 return 0;
 425                         }
 426                         packet_write(1, "NAK\n");
 427                         return -1;
 428                 }
 429                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 430         }
 431 }
 432
 433 static int is_our_ref(struct object *o)
 434 {
 435         return o->flags &
 436                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 437 }
 438
 439 static void check_non_tip(void)
 440 {
 441         static const char *argv[] = {
 442                 "rev-list", "--stdin", NULL,
 443         };
 444         static struct child_process cmd;
 445         struct object *o;
 446         char namebuf[42]; /* ^ + SHA-1 + LF */
 447         int i;
 448
 449         /* In the normal in-process case non-tip request can never happen */
 450         if (!stateless_rpc)
 451                 goto error;
 452
 453         cmd.argv = argv;
 454         cmd.git_cmd = 1;
 455         cmd.no_stderr = 1;
 456         cmd.in = -1;
 457         cmd.out = -1;
 458
 459         if (start_command(&cmd))
 460                 goto error;
 461
 462         /*
 463          * If rev-list --stdin encounters an unknown commit, it
 464          * terminates, which will cause SIGPIPE in the write loop
 465          * below.
 466          */
 467         sigchain_push(SIGPIPE, SIG_IGN);
 468
 469         namebuf[0] = '^';
 470         namebuf[41] = '\n';
 471         for (i = get_max_object_index(); 0 < i; ) {
 472                 o = get_indexed_object(--i);
 473                 if (!o)
 474                         continue;
 475                 if (!is_our_ref(o))
 476                         continue;
 477                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 478                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 479                         goto error;
 480         }
 481         namebuf[40] = '\n';
 482         for (i = 0; i < want_obj.nr; i++) {
 483                 o = want_obj.objects[i].item;
 484                 if (is_our_ref(o))
 485                         continue;
 486                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 487                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 488                         goto error;
 489         }
 490         close(cmd.in);
 491
 492         sigchain_pop(SIGPIPE);
 493
 494         /*
 495          * The commits out of the rev-list are not ancestors of
 496          * our ref.
 497          */
 498         i = read_in_full(cmd.out, namebuf, 1);
 499         if (i)
 500                 goto error;
 501         close(cmd.out);
 502
 503         /*
 504          * rev-list may have died by encountering a bad commit
 505          * in the history, in which case we do want to bail out
 506          * even when it showed no commit.
 507          */
 508         if (finish_command(&cmd))
 509                 goto error;
 510
 511         /* All the non-tip ones are ancestors of what we advertised */
 512         return;
 513
 514 error:
 515         /* Pick one of them (we know there at least is one) */
 516         for (i = 0; i < want_obj.nr; i++) {
 517                 o = want_obj.objects[i].item;
 518                 if (!is_our_ref(o))
 519                         die("git upload-pack: not our ref %s",
 520                             sha1_to_hex(o->sha1));
 521         }
 522 }
 523
 524 static void receive_needs(void)
 525 {
 526         struct object_array shallows = OBJECT_ARRAY_INIT;
 527         int depth = 0;
 528         int has_non_tip = 0;
 529
 530         shallow_nr = 0;
 531         for (;;) {
 532                 struct object *o;
 533                 const char *features;
 534                 unsigned char sha1_buf[20];
 535                 char *line = packet_read_line(0, NULL);
 536                 reset_timeout();
 537                 if (!line)
 538                         break;
 539
 540                 if (starts_with(line, "shallow ")) {
 541                         unsigned char sha1[20];
 542                         struct object *object;
 543                         if (get_sha1_hex(line + 8, sha1))
 544                                 die("invalid shallow line: %s", line);
 545                         object = parse_object(sha1);
 546                         if (!object)
 547                                 continue;
 548                         if (object->type != OBJ_COMMIT)
 549                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 550                         if (!(object->flags & CLIENT_SHALLOW)) {
 551                                 object->flags |= CLIENT_SHALLOW;
 552                                 add_object_array(object, NULL, &shallows);
 553                         }
 554                         continue;
 555                 }
 556                 if (starts_with(line, "deepen ")) {
 557                         char *end;
 558                         depth = strtol(line + 7, &end, 0);
 559                         if (end == line + 7 || depth <= 0)
 560                                 die("Invalid deepen: %s", line);
 561                         continue;
 562                 }
 563                 if (!starts_with(line, "want ") ||
 564                     get_sha1_hex(line+5, sha1_buf))
 565                         die("git upload-pack: protocol error, "
 566                             "expected to get sha, not '%s'", line);
 567
 568                 features = line + 45;
 569
 570                 if (parse_feature_request(features, "multi_ack_detailed"))
 571                         multi_ack = 2;
 572                 else if (parse_feature_request(features, "multi_ack"))
 573                         multi_ack = 1;
 574                 if (parse_feature_request(features, "no-done"))
 575                         no_done = 1;
 576                 if (parse_feature_request(features, "thin-pack"))
 577                         use_thin_pack = 1;
 578                 if (parse_feature_request(features, "ofs-delta"))
 579                         use_ofs_delta = 1;
 580                 if (parse_feature_request(features, "side-band-64k"))
 581                         use_sideband = LARGE_PACKET_MAX;
 582                 else if (parse_feature_request(features, "side-band"))
 583                         use_sideband = DEFAULT_PACKET_MAX;
 584                 if (parse_feature_request(features, "no-progress"))
 585                         no_progress = 1;
 586                 if (parse_feature_request(features, "include-tag"))
 587                         use_include_tag = 1;
 588
 589                 o = parse_object(sha1_buf);
 590                 if (!o)
 591                         die("git upload-pack: not our ref %s",
 592                             sha1_to_hex(sha1_buf));
 593                 if (!(o->flags & WANTED)) {
 594                         o->flags |= WANTED;
 595                         if (!is_our_ref(o))
 596                                 has_non_tip = 1;
 597                         add_object_array(o, NULL, &want_obj);
 598                 }
 599         }
 600
 601         /*
 602          * We have sent all our refs already, and the other end
 603          * should have chosen out of them. When we are operating
 604          * in the stateless RPC mode, however, their choice may
 605          * have been based on the set of older refs advertised
 606          * by another process that handled the initial request.
 607          */
 608         if (has_non_tip)
 609                 check_non_tip();
 610
 611         if (!use_sideband && daemon_mode)
 612                 no_progress = 1;
 613
 614         if (depth == 0 && shallows.nr == 0)
 615                 return;
 616         if (depth > 0) {
 617                 struct commit_list *result = NULL, *backup = NULL;
 618                 int i;
 619                 if (depth == INFINITE_DEPTH && !is_repository_shallow())
 620                         for (i = 0; i < shallows.nr; i++) {
 621                                 struct object *object = shallows.objects[i].item;
 622                                 object->flags |= NOT_SHALLOW;
 623                         }
 624                 else
 625                         backup = result =
 626                                 get_shallow_commits(&want_obj, depth,
 627                                                     SHALLOW, NOT_SHALLOW);
 628                 while (result) {
 629                         struct object *object = &result->item->object;
 630                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 631                                 packet_write(1, "shallow %s",
 632                                                 sha1_to_hex(object->sha1));
 633                                 register_shallow(object->sha1);
 634                                 shallow_nr++;
 635                         }
 636                         result = result->next;
 637                 }
 638                 free_commit_list(backup);
 639                 for (i = 0; i < shallows.nr; i++) {
 640                         struct object *object = shallows.objects[i].item;
 641                         if (object->flags & NOT_SHALLOW) {
 642                                 struct commit_list *parents;
 643                                 packet_write(1, "unshallow %s",
 644                                         sha1_to_hex(object->sha1));
 645                                 object->flags &= ~CLIENT_SHALLOW;
 646                                 /* make sure the real parents are parsed */
 647                                 unregister_shallow(object->sha1);
 648                                 object->parsed = 0;
 649                                 parse_commit_or_die((struct commit *)object);
 650                                 parents = ((struct commit *)object)->parents;
 651                                 while (parents) {
 652                                         add_object_array(&parents->item->object,
 653                                                         NULL, &want_obj);
 654                                         parents = parents->next;
 655                                 }
 656                                 add_object_array(object, NULL, &extra_edge_obj);
 657                         }
 658                         /* make sure commit traversal conforms to client */
 659                         register_shallow(object->sha1);
 660                 }
 661                 packet_flush(1);
 662         } else
 663                 if (shallows.nr > 0) {
 664                         int i;
 665                         for (i = 0; i < shallows.nr; i++)
 666                                 register_shallow(shallows.objects[i].item->sha1);
 667                 }
 668
 669         shallow_nr += shallows.nr;
 670         free(shallows.objects);
 671 }
 672
 673 /* return non-zero if the ref is hidden, otherwise 0 */
 674 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 675 {
 676         struct object *o = lookup_unknown_object(sha1);
 677
 678         if (ref_is_hidden(refname)) {
 679                 o->flags |= HIDDEN_REF;
 680                 return 1;
 681         }
 682         if (!o)
 683                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 684         o->flags |= OUR_REF;
 685         return 0;
 686 }
 687
 688 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 689 {
 690         struct string_list_item *item;
 691
 692         if (!symref->nr)
 693                 return;
 694         for_each_string_list_item(item, symref)
 695                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 696 }
 697
 698 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 699 {
 700         static const char *capabilities = "multi_ack thin-pack side-band"
 701                 " side-band-64k ofs-delta shallow no-progress"
 702                 " include-tag multi_ack_detailed";
 703         const char *refname_nons = strip_namespace(refname);
 704         unsigned char peeled[20];
 705
 706         if (mark_our_ref(refname, sha1, flag, NULL))
 707                 return 0;
 708
 709         if (capabilities) {
 710                 struct strbuf symref_info = STRBUF_INIT;
 711
 712                 format_symref_info(&symref_info, cb_data);
 713                 packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
 714                              sha1_to_hex(sha1), refname_nons,
 715                              0, capabilities,
 716                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 717                              stateless_rpc ? " no-done" : "",
 718                              symref_info.buf,
 719                              git_user_agent_sanitized());
 720                 strbuf_release(&symref_info);
 721         } else {
 722                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 723         }
 724         capabilities = NULL;
 725         if (!peel_ref(refname, peeled))
 726                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 727         return 0;
 728 }
 729
 730 static int find_symref(const char *refname, const unsigned char *sha1, int flag,
 731                        void *cb_data)
 732 {
 733         const char *symref_target;
 734         struct string_list_item *item;
 735         unsigned char unused[20];
 736
 737         if ((flag & REF_ISSYMREF) == 0)
 738                 return 0;
 739         symref_target = resolve_ref_unsafe(refname, unused, 0, &flag);
 740         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 741                 die("'%s' is a symref but it is not?", refname);
 742         item = string_list_append(cb_data, refname);
 743         item->util = xstrdup(symref_target);
 744         return 0;
 745 }
 746
 747 static void upload_pack(void)
 748 {
 749         struct string_list symref = STRING_LIST_INIT_DUP;
 750
 751         head_ref_namespaced(find_symref, &symref);
 752
 753         if (advertise_refs || !stateless_rpc) {
 754                 reset_timeout();
 755                 head_ref_namespaced(send_ref, &symref);
 756                 for_each_namespaced_ref(send_ref, &symref);
 757                 advertise_shallow_grafts(1);
 758                 packet_flush(1);
 759         } else {
 760                 head_ref_namespaced(mark_our_ref, NULL);
 761                 for_each_namespaced_ref(mark_our_ref, NULL);
 762         }
 763         string_list_clear(&symref, 1);
 764         if (advertise_refs)
 765                 return;
 766
 767         receive_needs();
 768         if (want_obj.nr) {
 769                 get_common_commits();
 770                 create_pack_file();
 771         }
 772 }
 773
 774 static int upload_pack_config(const char *var, const char *value, void *unused)
 775 {
 776         if (!strcmp("uploadpack.allowtipsha1inwant", var))
 777                 allow_tip_sha1_in_want = git_config_bool(var, value);
 778         else if (!strcmp("uploadpack.keepalive", var)) {
 779                 keepalive = git_config_int(var, value);
 780                 if (!keepalive)
 781                         keepalive = -1;
 782         }
 783         return parse_hide_refs_config(var, value, "uploadpack");
 784 }
 785
 786 int main(int argc, char **argv)
 787 {
 788         char *dir;
 789         int i;
 790         int strict = 0;
 791
 792         git_setup_gettext();
 793
 794         packet_trace_identity("upload-pack");
 795         git_extract_argv0_path(argv[0]);
 796         read_replace_refs = 0;
 797
 798         for (i = 1; i < argc; i++) {
 799                 char *arg = argv[i];
 800
 801                 if (arg[0] != '-')
 802                         break;
 803                 if (!strcmp(arg, "--advertise-refs")) {
 804                         advertise_refs = 1;
 805                         continue;
 806                 }
 807                 if (!strcmp(arg, "--stateless-rpc")) {
 808                         stateless_rpc = 1;
 809                         continue;
 810                 }
 811                 if (!strcmp(arg, "--strict")) {
 812                         strict = 1;
 813                         continue;
 814                 }
 815                 if (starts_with(arg, "--timeout=")) {
 816                         timeout = atoi(arg+10);
 817                         daemon_mode = 1;
 818                         continue;
 819                 }
 820                 if (!strcmp(arg, "--")) {
 821                         i++;
 822                         break;
 823                 }
 824         }
 825
 826         if (i != argc-1)
 827                 usage(upload_pack_usage);
 828
 829         setup_path();
 830
 831         dir = argv[i];
 832
 833         if (!enter_repo(dir, strict))
 834                 die("'%s' does not appear to be a git repository", dir);
 835
 836         git_config(upload_pack_config, NULL);
 837         upload_pack();
 838         return 0;
 839 }