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