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

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "pkt-line.h"
   4 #include "sideband.h"
   5 #include "tag.h"
   6 #include "object.h"
   7 #include "commit.h"
   8 #include "exec_cmd.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "list-objects.h"
  12 #include "run-command.h"
  13 #include "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 /* Remember to update object flag allocation in object.h */
  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 /* Allow specifying sha1 if it is a ref tip. */
  39 #define ALLOW_TIP_SHA1  01
  40 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  41 #define ALLOW_REACHABLE_SHA1    02
  42 static unsigned int allow_unadvertised_object_request;
  43 static int shallow_nr;
  44 static struct object_array have_obj;
  45 static struct object_array want_obj;
  46 static struct object_array extra_edge_obj;
  47 static unsigned int timeout;
  48 static int keepalive = 5;
  49 /* 0 for no sideband,
  50  * otherwise maximum packet size (up to 65520 bytes).
  51  */
  52 static int use_sideband;
  53 static int advertise_refs;
  54 static int stateless_rpc;
  55 static const char *pack_objects_hook;
  56
  57 static void reset_timeout(void)
  58 {
  59         alarm(timeout);
  60 }
  61
  62 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  63 {
  64         if (use_sideband)
  65                 return send_sideband(1, fd, data, sz, use_sideband);
  66         if (fd == 3)
  67                 /* emergency quit */
  68                 fd = 2;
  69         if (fd == 2) {
  70                 /* XXX: are we happy to lose stuff here? */
  71                 xwrite(fd, data, sz);
  72                 return sz;
  73         }
  74         write_or_die(fd, data, sz);
  75         return sz;
  76 }
  77
  78 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  79 {
  80         FILE *fp = cb_data;
  81         if (graft->nr_parent == -1)
  82                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  83         return 0;
  84 }
  85
  86 static void create_pack_file(void)
  87 {
  88         struct child_process pack_objects = CHILD_PROCESS_INIT;
  89         char data[8193], progress[128];
  90         char abort_msg[] = "aborting due to possible repository "
  91                 "corruption on the remote side.";
  92         int buffered = -1;
  93         ssize_t sz;
  94         int i;
  95         FILE *pipe_fd;
  96
  97         if (!pack_objects_hook)
  98                 pack_objects.git_cmd = 1;
  99         else {
 100                 argv_array_push(&pack_objects.args, pack_objects_hook);
 101                 argv_array_push(&pack_objects.args, "git");
 102                 pack_objects.use_shell = 1;
 103         }
 104
 105         if (shallow_nr) {
 106                 argv_array_push(&pack_objects.args, "--shallow-file");
 107                 argv_array_push(&pack_objects.args, "");
 108         }
 109         argv_array_push(&pack_objects.args, "pack-objects");
 110         argv_array_push(&pack_objects.args, "--revs");
 111         if (use_thin_pack)
 112                 argv_array_push(&pack_objects.args, "--thin");
 113
 114         argv_array_push(&pack_objects.args, "--stdout");
 115         if (shallow_nr)
 116                 argv_array_push(&pack_objects.args, "--shallow");
 117         if (!no_progress)
 118                 argv_array_push(&pack_objects.args, "--progress");
 119         if (use_ofs_delta)
 120                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 121         if (use_include_tag)
 122                 argv_array_push(&pack_objects.args, "--include-tag");
 123
 124         pack_objects.in = -1;
 125         pack_objects.out = -1;
 126         pack_objects.err = -1;
 127
 128         if (start_command(&pack_objects))
 129                 die("git upload-pack: unable to fork git-pack-objects");
 130
 131         pipe_fd = xfdopen(pack_objects.in, "w");
 132
 133         if (shallow_nr)
 134                 for_each_commit_graft(write_one_shallow, pipe_fd);
 135
 136         for (i = 0; i < want_obj.nr; i++)
 137                 fprintf(pipe_fd, "%s\n",
 138                         oid_to_hex(&want_obj.objects[i].item->oid));
 139         fprintf(pipe_fd, "--not\n");
 140         for (i = 0; i < have_obj.nr; i++)
 141                 fprintf(pipe_fd, "%s\n",
 142                         oid_to_hex(&have_obj.objects[i].item->oid));
 143         for (i = 0; i < extra_edge_obj.nr; i++)
 144                 fprintf(pipe_fd, "%s\n",
 145                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 146         fprintf(pipe_fd, "\n");
 147         fflush(pipe_fd);
 148         fclose(pipe_fd);
 149
 150         /* We read from pack_objects.err to capture stderr output for
 151          * progress bar, and pack_objects.out to capture the pack data.
 152          */
 153
 154         while (1) {
 155                 struct pollfd pfd[2];
 156                 int pe, pu, pollsize;
 157                 int ret;
 158
 159                 reset_timeout();
 160
 161                 pollsize = 0;
 162                 pe = pu = -1;
 163
 164                 if (0 <= pack_objects.out) {
 165                         pfd[pollsize].fd = pack_objects.out;
 166                         pfd[pollsize].events = POLLIN;
 167                         pu = pollsize;
 168                         pollsize++;
 169                 }
 170                 if (0 <= pack_objects.err) {
 171                         pfd[pollsize].fd = pack_objects.err;
 172                         pfd[pollsize].events = POLLIN;
 173                         pe = pollsize;
 174                         pollsize++;
 175                 }
 176
 177                 if (!pollsize)
 178                         break;
 179
 180                 ret = poll(pfd, pollsize,
 181                         keepalive < 0 ? -1 : 1000 * keepalive);
 182
 183                 if (ret < 0) {
 184                         if (errno != EINTR) {
 185                                 error_errno("poll failed, resuming");
 186                                 sleep(1);
 187                         }
 188                         continue;
 189                 }
 190                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 191                         /* Status ready; we ship that in the side-band
 192                          * or dump to the standard error.
 193                          */
 194                         sz = xread(pack_objects.err, progress,
 195                                   sizeof(progress));
 196                         if (0 < sz)
 197                                 send_client_data(2, progress, sz);
 198                         else if (sz == 0) {
 199                                 close(pack_objects.err);
 200                                 pack_objects.err = -1;
 201                         }
 202                         else
 203                                 goto fail;
 204                         /* give priority to status messages */
 205                         continue;
 206                 }
 207                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 208                         /* Data ready; we keep the last byte to ourselves
 209                          * in case we detect broken rev-list, so that we
 210                          * can leave the stream corrupted.  This is
 211                          * unfortunate -- unpack-objects would happily
 212                          * accept a valid packdata with trailing garbage,
 213                          * so appending garbage after we pass all the
 214                          * pack data is not good enough to signal
 215                          * breakage to downstream.
 216                          */
 217                         char *cp = data;
 218                         ssize_t outsz = 0;
 219                         if (0 <= buffered) {
 220                                 *cp++ = buffered;
 221                                 outsz++;
 222                         }
 223                         sz = xread(pack_objects.out, cp,
 224                                   sizeof(data) - outsz);
 225                         if (0 < sz)
 226                                 ;
 227                         else if (sz == 0) {
 228                                 close(pack_objects.out);
 229                                 pack_objects.out = -1;
 230                         }
 231                         else
 232                                 goto fail;
 233                         sz += outsz;
 234                         if (1 < sz) {
 235                                 buffered = data[sz-1] & 0xFF;
 236                                 sz--;
 237                         }
 238                         else
 239                                 buffered = -1;
 240                         sz = send_client_data(1, data, sz);
 241                         if (sz < 0)
 242                                 goto fail;
 243                 }
 244
 245                 /*
 246                  * We hit the keepalive timeout without saying anything; send
 247                  * an empty message on the data sideband just to let the other
 248                  * side know we're still working on it, but don't have any data
 249                  * yet.
 250                  *
 251                  * If we don't have a sideband channel, there's no room in the
 252                  * protocol to say anything, so those clients are just out of
 253                  * luck.
 254                  */
 255                 if (!ret && use_sideband) {
 256                         static const char buf[] = "0005\1";
 257                         write_or_die(1, buf, 5);
 258                 }
 259         }
 260
 261         if (finish_command(&pack_objects)) {
 262                 error("git upload-pack: git-pack-objects died with error.");
 263                 goto fail;
 264         }
 265
 266         /* flush the data */
 267         if (0 <= buffered) {
 268                 data[0] = buffered;
 269                 sz = send_client_data(1, data, 1);
 270                 if (sz < 0)
 271                         goto fail;
 272                 fprintf(stderr, "flushed.\n");
 273         }
 274         if (use_sideband)
 275                 packet_flush(1);
 276         return;
 277
 278  fail:
 279         send_client_data(3, abort_msg, sizeof(abort_msg));
 280         die("git upload-pack: %s", abort_msg);
 281 }
 282
 283 static int got_sha1(char *hex, unsigned char *sha1)
 284 {
 285         struct object *o;
 286         int we_knew_they_have = 0;
 287
 288         if (get_sha1_hex(hex, sha1))
 289                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 290         if (!has_sha1_file(sha1))
 291                 return -1;
 292
 293         o = parse_object(sha1);
 294         if (!o)
 295                 die("oops (%s)", sha1_to_hex(sha1));
 296         if (o->type == OBJ_COMMIT) {
 297                 struct commit_list *parents;
 298                 struct commit *commit = (struct commit *)o;
 299                 if (o->flags & THEY_HAVE)
 300                         we_knew_they_have = 1;
 301                 else
 302                         o->flags |= THEY_HAVE;
 303                 if (!oldest_have || (commit->date < oldest_have))
 304                         oldest_have = commit->date;
 305                 for (parents = commit->parents;
 306                      parents;
 307                      parents = parents->next)
 308                         parents->item->object.flags |= THEY_HAVE;
 309         }
 310         if (!we_knew_they_have) {
 311                 add_object_array(o, NULL, &have_obj);
 312                 return 1;
 313         }
 314         return 0;
 315 }
 316
 317 static int reachable(struct commit *want)
 318 {
 319         struct commit_list *work = NULL;
 320
 321         commit_list_insert_by_date(want, &work);
 322         while (work) {
 323                 struct commit_list *list;
 324                 struct commit *commit = pop_commit(&work);
 325
 326                 if (commit->object.flags & THEY_HAVE) {
 327                         want->object.flags |= COMMON_KNOWN;
 328                         break;
 329                 }
 330                 if (!commit->object.parsed)
 331                         parse_object(commit->object.oid.hash);
 332                 if (commit->object.flags & REACHABLE)
 333                         continue;
 334                 commit->object.flags |= REACHABLE;
 335                 if (commit->date < oldest_have)
 336                         continue;
 337                 for (list = commit->parents; list; list = list->next) {
 338                         struct commit *parent = list->item;
 339                         if (!(parent->object.flags & REACHABLE))
 340                                 commit_list_insert_by_date(parent, &work);
 341                 }
 342         }
 343         want->object.flags |= REACHABLE;
 344         clear_commit_marks(want, REACHABLE);
 345         free_commit_list(work);
 346         return (want->object.flags & COMMON_KNOWN);
 347 }
 348
 349 static int ok_to_give_up(void)
 350 {
 351         int i;
 352
 353         if (!have_obj.nr)
 354                 return 0;
 355
 356         for (i = 0; i < want_obj.nr; i++) {
 357                 struct object *want = want_obj.objects[i].item;
 358
 359                 if (want->flags & COMMON_KNOWN)
 360                         continue;
 361                 want = deref_tag(want, "a want line", 0);
 362                 if (!want || want->type != OBJ_COMMIT) {
 363                         /* no way to tell if this is reachable by
 364                          * looking at the ancestry chain alone, so
 365                          * leave a note to ourselves not to worry about
 366                          * this object anymore.
 367                          */
 368                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 369                         continue;
 370                 }
 371                 if (!reachable((struct commit *)want))
 372                         return 0;
 373         }
 374         return 1;
 375 }
 376
 377 static int get_common_commits(void)
 378 {
 379         unsigned char sha1[20];
 380         char last_hex[41];
 381         int got_common = 0;
 382         int got_other = 0;
 383         int sent_ready = 0;
 384
 385         save_commit_buffer = 0;
 386
 387         for (;;) {
 388                 char *line = packet_read_line(0, NULL);
 389                 reset_timeout();
 390
 391                 if (!line) {
 392                         if (multi_ack == 2 && got_common
 393                             && !got_other && ok_to_give_up()) {
 394                                 sent_ready = 1;
 395                                 packet_write(1, "ACK %s ready\n", last_hex);
 396                         }
 397                         if (have_obj.nr == 0 || multi_ack)
 398                                 packet_write(1, "NAK\n");
 399
 400                         if (no_done && sent_ready) {
 401                                 packet_write(1, "ACK %s\n", last_hex);
 402                                 return 0;
 403                         }
 404                         if (stateless_rpc)
 405                                 exit(0);
 406                         got_common = 0;
 407                         got_other = 0;
 408                         continue;
 409                 }
 410                 if (starts_with(line, "have ")) {
 411                         switch (got_sha1(line+5, sha1)) {
 412                         case -1: /* they have what we do not */
 413                                 got_other = 1;
 414                                 if (multi_ack && ok_to_give_up()) {
 415                                         const char *hex = sha1_to_hex(sha1);
 416                                         if (multi_ack == 2) {
 417                                                 sent_ready = 1;
 418                                                 packet_write(1, "ACK %s ready\n", hex);
 419                                         } else
 420                                                 packet_write(1, "ACK %s continue\n", hex);
 421                                 }
 422                                 break;
 423                         default:
 424                                 got_common = 1;
 425                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 426                                 if (multi_ack == 2)
 427                                         packet_write(1, "ACK %s common\n", last_hex);
 428                                 else if (multi_ack)
 429                                         packet_write(1, "ACK %s continue\n", last_hex);
 430                                 else if (have_obj.nr == 1)
 431                                         packet_write(1, "ACK %s\n", last_hex);
 432                                 break;
 433                         }
 434                         continue;
 435                 }
 436                 if (!strcmp(line, "done")) {
 437                         if (have_obj.nr > 0) {
 438                                 if (multi_ack)
 439                                         packet_write(1, "ACK %s\n", last_hex);
 440                                 return 0;
 441                         }
 442                         packet_write(1, "NAK\n");
 443                         return -1;
 444                 }
 445                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 446         }
 447 }
 448
 449 static int is_our_ref(struct object *o)
 450 {
 451         int allow_hidden_ref = (allow_unadvertised_object_request &
 452                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 453         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 454 }
 455
 456 static void check_non_tip(void)
 457 {
 458         static const char *argv[] = {
 459                 "rev-list", "--stdin", NULL,
 460         };
 461         static struct child_process cmd = CHILD_PROCESS_INIT;
 462         struct object *o;
 463         char namebuf[42]; /* ^ + SHA-1 + LF */
 464         int i;
 465
 466         /*
 467          * In the normal in-process case without
 468          * uploadpack.allowReachableSHA1InWant,
 469          * non-tip requests can never happen.
 470          */
 471         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 472                 goto error;
 473
 474         cmd.argv = argv;
 475         cmd.git_cmd = 1;
 476         cmd.no_stderr = 1;
 477         cmd.in = -1;
 478         cmd.out = -1;
 479
 480         if (start_command(&cmd))
 481                 goto error;
 482
 483         /*
 484          * If rev-list --stdin encounters an unknown commit, it
 485          * terminates, which will cause SIGPIPE in the write loop
 486          * below.
 487          */
 488         sigchain_push(SIGPIPE, SIG_IGN);
 489
 490         namebuf[0] = '^';
 491         namebuf[41] = '\n';
 492         for (i = get_max_object_index(); 0 < i; ) {
 493                 o = get_indexed_object(--i);
 494                 if (!o)
 495                         continue;
 496                 if (!is_our_ref(o))
 497                         continue;
 498                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 499                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 500                         goto error;
 501         }
 502         namebuf[40] = '\n';
 503         for (i = 0; i < want_obj.nr; i++) {
 504                 o = want_obj.objects[i].item;
 505                 if (is_our_ref(o))
 506                         continue;
 507                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 508                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 509                         goto error;
 510         }
 511         close(cmd.in);
 512
 513         sigchain_pop(SIGPIPE);
 514
 515         /*
 516          * The commits out of the rev-list are not ancestors of
 517          * our ref.
 518          */
 519         i = read_in_full(cmd.out, namebuf, 1);
 520         if (i)
 521                 goto error;
 522         close(cmd.out);
 523
 524         /*
 525          * rev-list may have died by encountering a bad commit
 526          * in the history, in which case we do want to bail out
 527          * even when it showed no commit.
 528          */
 529         if (finish_command(&cmd))
 530                 goto error;
 531
 532         /* All the non-tip ones are ancestors of what we advertised */
 533         return;
 534
 535 error:
 536         /* Pick one of them (we know there at least is one) */
 537         for (i = 0; i < want_obj.nr; i++) {
 538                 o = want_obj.objects[i].item;
 539                 if (!is_our_ref(o))
 540                         die("git upload-pack: not our ref %s",
 541                             oid_to_hex(&o->oid));
 542         }
 543 }
 544
 545 static void receive_needs(void)
 546 {
 547         struct object_array shallows = OBJECT_ARRAY_INIT;
 548         int depth = 0;
 549         int has_non_tip = 0;
 550
 551         shallow_nr = 0;
 552         for (;;) {
 553                 struct object *o;
 554                 const char *features;
 555                 unsigned char sha1_buf[20];
 556                 char *line = packet_read_line(0, NULL);
 557                 reset_timeout();
 558                 if (!line)
 559                         break;
 560
 561                 if (starts_with(line, "shallow ")) {
 562                         unsigned char sha1[20];
 563                         struct object *object;
 564                         if (get_sha1_hex(line + 8, sha1))
 565                                 die("invalid shallow line: %s", line);
 566                         object = parse_object(sha1);
 567                         if (!object)
 568                                 continue;
 569                         if (object->type != OBJ_COMMIT)
 570                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 571                         if (!(object->flags & CLIENT_SHALLOW)) {
 572                                 object->flags |= CLIENT_SHALLOW;
 573                                 add_object_array(object, NULL, &shallows);
 574                         }
 575                         continue;
 576                 }
 577                 if (starts_with(line, "deepen ")) {
 578                         char *end;
 579                         depth = strtol(line + 7, &end, 0);
 580                         if (end == line + 7 || depth <= 0)
 581                                 die("Invalid deepen: %s", line);
 582                         continue;
 583                 }
 584                 if (!starts_with(line, "want ") ||
 585                     get_sha1_hex(line+5, sha1_buf))
 586                         die("git upload-pack: protocol error, "
 587                             "expected to get sha, not '%s'", line);
 588
 589                 features = line + 45;
 590
 591                 if (parse_feature_request(features, "multi_ack_detailed"))
 592                         multi_ack = 2;
 593                 else if (parse_feature_request(features, "multi_ack"))
 594                         multi_ack = 1;
 595                 if (parse_feature_request(features, "no-done"))
 596                         no_done = 1;
 597                 if (parse_feature_request(features, "thin-pack"))
 598                         use_thin_pack = 1;
 599                 if (parse_feature_request(features, "ofs-delta"))
 600                         use_ofs_delta = 1;
 601                 if (parse_feature_request(features, "side-band-64k"))
 602                         use_sideband = LARGE_PACKET_MAX;
 603                 else if (parse_feature_request(features, "side-band"))
 604                         use_sideband = DEFAULT_PACKET_MAX;
 605                 if (parse_feature_request(features, "no-progress"))
 606                         no_progress = 1;
 607                 if (parse_feature_request(features, "include-tag"))
 608                         use_include_tag = 1;
 609
 610                 o = parse_object(sha1_buf);
 611                 if (!o)
 612                         die("git upload-pack: not our ref %s",
 613                             sha1_to_hex(sha1_buf));
 614                 if (!(o->flags & WANTED)) {
 615                         o->flags |= WANTED;
 616                         if (!is_our_ref(o))
 617                                 has_non_tip = 1;
 618                         add_object_array(o, NULL, &want_obj);
 619                 }
 620         }
 621
 622         /*
 623          * We have sent all our refs already, and the other end
 624          * should have chosen out of them. When we are operating
 625          * in the stateless RPC mode, however, their choice may
 626          * have been based on the set of older refs advertised
 627          * by another process that handled the initial request.
 628          */
 629         if (has_non_tip)
 630                 check_non_tip();
 631
 632         if (!use_sideband && daemon_mode)
 633                 no_progress = 1;
 634
 635         if (depth == 0 && shallows.nr == 0)
 636                 return;
 637         if (depth > 0) {
 638                 struct commit_list *result = NULL, *backup = NULL;
 639                 int i;
 640                 if (depth == INFINITE_DEPTH && !is_repository_shallow())
 641                         for (i = 0; i < shallows.nr; i++) {
 642                                 struct object *object = shallows.objects[i].item;
 643                                 object->flags |= NOT_SHALLOW;
 644                         }
 645                 else
 646                         backup = result =
 647                                 get_shallow_commits(&want_obj, depth,
 648                                                     SHALLOW, NOT_SHALLOW);
 649                 while (result) {
 650                         struct object *object = &result->item->object;
 651                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 652                                 packet_write(1, "shallow %s",
 653                                                 oid_to_hex(&object->oid));
 654                                 register_shallow(object->oid.hash);
 655                                 shallow_nr++;
 656                         }
 657                         result = result->next;
 658                 }
 659                 free_commit_list(backup);
 660                 for (i = 0; i < shallows.nr; i++) {
 661                         struct object *object = shallows.objects[i].item;
 662                         if (object->flags & NOT_SHALLOW) {
 663                                 struct commit_list *parents;
 664                                 packet_write(1, "unshallow %s",
 665                                         oid_to_hex(&object->oid));
 666                                 object->flags &= ~CLIENT_SHALLOW;
 667                                 /* make sure the real parents are parsed */
 668                                 unregister_shallow(object->oid.hash);
 669                                 object->parsed = 0;
 670                                 parse_commit_or_die((struct commit *)object);
 671                                 parents = ((struct commit *)object)->parents;
 672                                 while (parents) {
 673                                         add_object_array(&parents->item->object,
 674                                                         NULL, &want_obj);
 675                                         parents = parents->next;
 676                                 }
 677                                 add_object_array(object, NULL, &extra_edge_obj);
 678                         }
 679                         /* make sure commit traversal conforms to client */
 680                         register_shallow(object->oid.hash);
 681                 }
 682                 packet_flush(1);
 683         } else
 684                 if (shallows.nr > 0) {
 685                         int i;
 686                         for (i = 0; i < shallows.nr; i++)
 687                                 register_shallow(shallows.objects[i].item->oid.hash);
 688                 }
 689
 690         shallow_nr += shallows.nr;
 691         free(shallows.objects);
 692 }
 693
 694 /* return non-zero if the ref is hidden, otherwise 0 */
 695 static int mark_our_ref(const char *refname, const char *refname_full,
 696                         const struct object_id *oid)
 697 {
 698         struct object *o = lookup_unknown_object(oid->hash);
 699
 700         if (ref_is_hidden(refname, refname_full)) {
 701                 o->flags |= HIDDEN_REF;
 702                 return 1;
 703         }
 704         o->flags |= OUR_REF;
 705         return 0;
 706 }
 707
 708 static int check_ref(const char *refname_full, const struct object_id *oid,
 709                      int flag, void *cb_data)
 710 {
 711         const char *refname = strip_namespace(refname_full);
 712
 713         mark_our_ref(refname, refname_full, oid);
 714         return 0;
 715 }
 716
 717 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 718 {
 719         struct string_list_item *item;
 720
 721         if (!symref->nr)
 722                 return;
 723         for_each_string_list_item(item, symref)
 724                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 725 }
 726
 727 static int send_ref(const char *refname, const struct object_id *oid,
 728                     int flag, void *cb_data)
 729 {
 730         static const char *capabilities = "multi_ack thin-pack side-band"
 731                 " side-band-64k ofs-delta shallow no-progress"
 732                 " include-tag multi_ack_detailed";
 733         const char *refname_nons = strip_namespace(refname);
 734         struct object_id peeled;
 735
 736         if (mark_our_ref(refname_nons, refname, oid))
 737                 return 0;
 738
 739         if (capabilities) {
 740                 struct strbuf symref_info = STRBUF_INIT;
 741
 742                 format_symref_info(&symref_info, cb_data);
 743                 packet_write(1, "%s %s%c%s%s%s%s%s agent=%s\n",
 744                              oid_to_hex(oid), refname_nons,
 745                              0, capabilities,
 746                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 747                                      " allow-tip-sha1-in-want" : "",
 748                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 749                                      " allow-reachable-sha1-in-want" : "",
 750                              stateless_rpc ? " no-done" : "",
 751                              symref_info.buf,
 752                              git_user_agent_sanitized());
 753                 strbuf_release(&symref_info);
 754         } else {
 755                 packet_write(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 756         }
 757         capabilities = NULL;
 758         if (!peel_ref(refname, peeled.hash))
 759                 packet_write(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 760         return 0;
 761 }
 762
 763 static int find_symref(const char *refname, const struct object_id *oid,
 764                        int flag, void *cb_data)
 765 {
 766         const char *symref_target;
 767         struct string_list_item *item;
 768         struct object_id unused;
 769
 770         if ((flag & REF_ISSYMREF) == 0)
 771                 return 0;
 772         symref_target = resolve_ref_unsafe(refname, 0, unused.hash, &flag);
 773         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 774                 die("'%s' is a symref but it is not?", refname);
 775         item = string_list_append(cb_data, refname);
 776         item->util = xstrdup(symref_target);
 777         return 0;
 778 }
 779
 780 static void upload_pack(void)
 781 {
 782         struct string_list symref = STRING_LIST_INIT_DUP;
 783
 784         head_ref_namespaced(find_symref, &symref);
 785
 786         if (advertise_refs || !stateless_rpc) {
 787                 reset_timeout();
 788                 head_ref_namespaced(send_ref, &symref);
 789                 for_each_namespaced_ref(send_ref, &symref);
 790                 advertise_shallow_grafts(1);
 791                 packet_flush(1);
 792         } else {
 793                 head_ref_namespaced(check_ref, NULL);
 794                 for_each_namespaced_ref(check_ref, NULL);
 795         }
 796         string_list_clear(&symref, 1);
 797         if (advertise_refs)
 798                 return;
 799
 800         receive_needs();
 801         if (want_obj.nr) {
 802                 get_common_commits();
 803                 create_pack_file();
 804         }
 805 }
 806
 807 static int upload_pack_config(const char *var, const char *value, void *unused)
 808 {
 809         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
 810                 if (git_config_bool(var, value))
 811                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
 812                 else
 813                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
 814         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
 815                 if (git_config_bool(var, value))
 816                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
 817                 else
 818                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
 819         } else if (!strcmp("uploadpack.keepalive", var)) {
 820                 keepalive = git_config_int(var, value);
 821                 if (!keepalive)
 822                         keepalive = -1;
 823         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
 824                 if (!strcmp("uploadpack.packobjectshook", var))
 825                         return git_config_string(&pack_objects_hook, var, value);
 826         }
 827         return parse_hide_refs_config(var, value, "uploadpack");
 828 }
 829
 830 int main(int argc, char **argv)
 831 {
 832         char *dir;
 833         int i;
 834         int strict = 0;
 835
 836         git_setup_gettext();
 837
 838         packet_trace_identity("upload-pack");
 839         git_extract_argv0_path(argv[0]);
 840         check_replace_refs = 0;
 841
 842         for (i = 1; i < argc; i++) {
 843                 char *arg = argv[i];
 844
 845                 if (arg[0] != '-')
 846                         break;
 847                 if (!strcmp(arg, "--advertise-refs")) {
 848                         advertise_refs = 1;
 849                         continue;
 850                 }
 851                 if (!strcmp(arg, "--stateless-rpc")) {
 852                         stateless_rpc = 1;
 853                         continue;
 854                 }
 855                 if (!strcmp(arg, "--strict")) {
 856                         strict = 1;
 857                         continue;
 858                 }
 859                 if (starts_with(arg, "--timeout=")) {
 860                         timeout = atoi(arg+10);
 861                         daemon_mode = 1;
 862                         continue;
 863                 }
 864                 if (!strcmp(arg, "--")) {
 865                         i++;
 866                         break;
 867                 }
 868         }
 869
 870         if (i != argc-1)
 871                 usage(upload_pack_usage);
 872
 873         setup_path();
 874
 875         dir = argv[i];
 876
 877         if (!enter_repo(dir, strict))
 878                 die("'%s' does not appear to be a git repository", dir);
 879
 880         git_config(upload_pack_config, NULL);
 881         upload_pack();
 882         return 0;
 883 }