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