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 static int allow_tip_sha1_in_want;
  39 static int shallow_nr;
  40 static struct object_array have_obj;
  41 static struct object_array want_obj;
  42 static struct object_array extra_edge_obj;
  43 static unsigned int timeout;
  44 static int keepalive = 5;
  45 /* 0 for no sideband,
  46  * otherwise maximum packet size (up to 65520 bytes).
  47  */
  48 static int use_sideband;
  49 static int advertise_refs;
  50 static int stateless_rpc;
  51
  52 static void reset_timeout(void)
  53 {
  54         alarm(timeout);
  55 }
  56
  57 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  58 {
  59         if (use_sideband)
  60                 return send_sideband(1, fd, data, sz, use_sideband);
  61         if (fd == 3)
  62                 /* emergency quit */
  63                 fd = 2;
  64         if (fd == 2) {
  65                 /* XXX: are we happy to lose stuff here? */
  66                 xwrite(fd, data, sz);
  67                 return sz;
  68         }
  69         write_or_die(fd, data, sz);
  70         return sz;
  71 }
  72
  73 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  74 {
  75         FILE *fp = cb_data;
  76         if (graft->nr_parent == -1)
  77                 fprintf(fp, "--shallow %s\n", sha1_to_hex(graft->sha1));
  78         return 0;
  79 }
  80
  81 static void create_pack_file(void)
  82 {
  83         struct child_process pack_objects = CHILD_PROCESS_INIT;
  84         char data[8193], progress[128];
  85         char abort_msg[] = "aborting due to possible repository "
  86                 "corruption on the remote side.";
  87         int buffered = -1;
  88         ssize_t sz;
  89         const char *argv[13];
  90         int i, arg = 0;
  91         FILE *pipe_fd;
  92
  93         if (shallow_nr) {
  94                 argv[arg++] = "--shallow-file";
  95                 argv[arg++] = "";
  96         }
  97         argv[arg++] = "pack-objects";
  98         argv[arg++] = "--revs";
  99         if (use_thin_pack)
 100                 argv[arg++] = "--thin";
 101
 102         argv[arg++] = "--stdout";
 103         if (shallow_nr)
 104                 argv[arg++] = "--shallow";
 105         if (!no_progress)
 106                 argv[arg++] = "--progress";
 107         if (use_ofs_delta)
 108                 argv[arg++] = "--delta-base-offset";
 109         if (use_include_tag)
 110                 argv[arg++] = "--include-tag";
 111         argv[arg++] = NULL;
 112
 113         pack_objects.in = -1;
 114         pack_objects.out = -1;
 115         pack_objects.err = -1;
 116         pack_objects.git_cmd = 1;
 117         pack_objects.argv = argv;
 118
 119         if (start_command(&pack_objects))
 120                 die("git upload-pack: unable to fork git-pack-objects");
 121
 122         pipe_fd = xfdopen(pack_objects.in, "w");
 123
 124         if (shallow_nr)
 125                 for_each_commit_graft(write_one_shallow, pipe_fd);
 126
 127         for (i = 0; i < want_obj.nr; i++)
 128                 fprintf(pipe_fd, "%s\n",
 129                         sha1_to_hex(want_obj.objects[i].item->sha1));
 130         fprintf(pipe_fd, "--not\n");
 131         for (i = 0; i < have_obj.nr; i++)
 132                 fprintf(pipe_fd, "%s\n",
 133                         sha1_to_hex(have_obj.objects[i].item->sha1));
 134         for (i = 0; i < extra_edge_obj.nr; i++)
 135                 fprintf(pipe_fd, "%s\n",
 136                         sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
 137         fprintf(pipe_fd, "\n");
 138         fflush(pipe_fd);
 139         fclose(pipe_fd);
 140
 141         /* We read from pack_objects.err to capture stderr output for
 142          * progress bar, and pack_objects.out to capture the pack data.
 143          */
 144
 145         while (1) {
 146                 struct pollfd pfd[2];
 147                 int pe, pu, pollsize;
 148                 int ret;
 149
 150                 reset_timeout();
 151
 152                 pollsize = 0;
 153                 pe = pu = -1;
 154
 155                 if (0 <= pack_objects.out) {
 156                         pfd[pollsize].fd = pack_objects.out;
 157                         pfd[pollsize].events = POLLIN;
 158                         pu = pollsize;
 159                         pollsize++;
 160                 }
 161                 if (0 <= pack_objects.err) {
 162                         pfd[pollsize].fd = pack_objects.err;
 163                         pfd[pollsize].events = POLLIN;
 164                         pe = pollsize;
 165                         pollsize++;
 166                 }
 167
 168                 if (!pollsize)
 169                         break;
 170
 171                 ret = poll(pfd, pollsize,
 172                         keepalive < 0 ? -1 : 1000 * keepalive);
 173
 174                 if (ret < 0) {
 175                         if (errno != EINTR) {
 176                                 error("poll failed, resuming: %s",
 177                                       strerror(errno));
 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 = work->next;
 316                 struct commit *commit = work->item;
 317                 free(work);
 318                 work = list;
 319
 320                 if (commit->object.flags & THEY_HAVE) {
 321                         want->object.flags |= COMMON_KNOWN;
 322                         break;
 323                 }
 324                 if (!commit->object.parsed)
 325                         parse_object(commit->object.sha1);
 326                 if (commit->object.flags & REACHABLE)
 327                         continue;
 328                 commit->object.flags |= REACHABLE;
 329                 if (commit->date < oldest_have)
 330                         continue;
 331                 for (list = commit->parents; list; list = list->next) {
 332                         struct commit *parent = list->item;
 333                         if (!(parent->object.flags & REACHABLE))
 334                                 commit_list_insert_by_date(parent, &work);
 335                 }
 336         }
 337         want->object.flags |= REACHABLE;
 338         clear_commit_marks(want, REACHABLE);
 339         free_commit_list(work);
 340         return (want->object.flags & COMMON_KNOWN);
 341 }
 342
 343 static int ok_to_give_up(void)
 344 {
 345         int i;
 346
 347         if (!have_obj.nr)
 348                 return 0;
 349
 350         for (i = 0; i < want_obj.nr; i++) {
 351                 struct object *want = want_obj.objects[i].item;
 352
 353                 if (want->flags & COMMON_KNOWN)
 354                         continue;
 355                 want = deref_tag(want, "a want line", 0);
 356                 if (!want || want->type != OBJ_COMMIT) {
 357                         /* no way to tell if this is reachable by
 358                          * looking at the ancestry chain alone, so
 359                          * leave a note to ourselves not to worry about
 360                          * this object anymore.
 361                          */
 362                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 363                         continue;
 364                 }
 365                 if (!reachable((struct commit *)want))
 366                         return 0;
 367         }
 368         return 1;
 369 }
 370
 371 static int get_common_commits(void)
 372 {
 373         unsigned char sha1[20];
 374         char last_hex[41];
 375         int got_common = 0;
 376         int got_other = 0;
 377         int sent_ready = 0;
 378
 379         save_commit_buffer = 0;
 380
 381         for (;;) {
 382                 char *line = packet_read_line(0, NULL);
 383                 reset_timeout();
 384
 385                 if (!line) {
 386                         if (multi_ack == 2 && got_common
 387                             && !got_other && ok_to_give_up()) {
 388                                 sent_ready = 1;
 389                                 packet_write(1, "ACK %s ready\n", last_hex);
 390                         }
 391                         if (have_obj.nr == 0 || multi_ack)
 392                                 packet_write(1, "NAK\n");
 393
 394                         if (no_done && sent_ready) {
 395                                 packet_write(1, "ACK %s\n", last_hex);
 396                                 return 0;
 397                         }
 398                         if (stateless_rpc)
 399                                 exit(0);
 400                         got_common = 0;
 401                         got_other = 0;
 402                         continue;
 403                 }
 404                 if (starts_with(line, "have ")) {
 405                         switch (got_sha1(line+5, sha1)) {
 406                         case -1: /* they have what we do not */
 407                                 got_other = 1;
 408                                 if (multi_ack && ok_to_give_up()) {
 409                                         const char *hex = sha1_to_hex(sha1);
 410                                         if (multi_ack == 2) {
 411                                                 sent_ready = 1;
 412                                                 packet_write(1, "ACK %s ready\n", hex);
 413                                         } else
 414                                                 packet_write(1, "ACK %s continue\n", hex);
 415                                 }
 416                                 break;
 417                         default:
 418                                 got_common = 1;
 419                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 420                                 if (multi_ack == 2)
 421                                         packet_write(1, "ACK %s common\n", last_hex);
 422                                 else if (multi_ack)
 423                                         packet_write(1, "ACK %s continue\n", last_hex);
 424                                 else if (have_obj.nr == 1)
 425                                         packet_write(1, "ACK %s\n", last_hex);
 426                                 break;
 427                         }
 428                         continue;
 429                 }
 430                 if (!strcmp(line, "done")) {
 431                         if (have_obj.nr > 0) {
 432                                 if (multi_ack)
 433                                         packet_write(1, "ACK %s\n", last_hex);
 434                                 return 0;
 435                         }
 436                         packet_write(1, "NAK\n");
 437                         return -1;
 438                 }
 439                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 440         }
 441 }
 442
 443 static int is_our_ref(struct object *o)
 444 {
 445         return o->flags &
 446                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 447 }
 448
 449 static void check_non_tip(void)
 450 {
 451         static const char *argv[] = {
 452                 "rev-list", "--stdin", NULL,
 453         };
 454         static struct child_process cmd = CHILD_PROCESS_INIT;
 455         struct object *o;
 456         char namebuf[42]; /* ^ + SHA-1 + LF */
 457         int i;
 458
 459         /* In the normal in-process case non-tip request can never happen */
 460         if (!stateless_rpc)
 461                 goto error;
 462
 463         cmd.argv = argv;
 464         cmd.git_cmd = 1;
 465         cmd.no_stderr = 1;
 466         cmd.in = -1;
 467         cmd.out = -1;
 468
 469         if (start_command(&cmd))
 470                 goto error;
 471
 472         /*
 473          * If rev-list --stdin encounters an unknown commit, it
 474          * terminates, which will cause SIGPIPE in the write loop
 475          * below.
 476          */
 477         sigchain_push(SIGPIPE, SIG_IGN);
 478
 479         namebuf[0] = '^';
 480         namebuf[41] = '\n';
 481         for (i = get_max_object_index(); 0 < i; ) {
 482                 o = get_indexed_object(--i);
 483                 if (!o)
 484                         continue;
 485                 if (!is_our_ref(o))
 486                         continue;
 487                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 488                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 489                         goto error;
 490         }
 491         namebuf[40] = '\n';
 492         for (i = 0; i < want_obj.nr; i++) {
 493                 o = want_obj.objects[i].item;
 494                 if (is_our_ref(o))
 495                         continue;
 496                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 497                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 498                         goto error;
 499         }
 500         close(cmd.in);
 501
 502         sigchain_pop(SIGPIPE);
 503
 504         /*
 505          * The commits out of the rev-list are not ancestors of
 506          * our ref.
 507          */
 508         i = read_in_full(cmd.out, namebuf, 1);
 509         if (i)
 510                 goto error;
 511         close(cmd.out);
 512
 513         /*
 514          * rev-list may have died by encountering a bad commit
 515          * in the history, in which case we do want to bail out
 516          * even when it showed no commit.
 517          */
 518         if (finish_command(&cmd))
 519                 goto error;
 520
 521         /* All the non-tip ones are ancestors of what we advertised */
 522         return;
 523
 524 error:
 525         /* Pick one of them (we know there at least is one) */
 526         for (i = 0; i < want_obj.nr; i++) {
 527                 o = want_obj.objects[i].item;
 528                 if (!is_our_ref(o))
 529                         die("git upload-pack: not our ref %s",
 530                             sha1_to_hex(o->sha1));
 531         }
 532 }
 533
 534 static void receive_needs(void)
 535 {
 536         struct object_array shallows = OBJECT_ARRAY_INIT;
 537         int depth = 0;
 538         int has_non_tip = 0;
 539
 540         shallow_nr = 0;
 541         for (;;) {
 542                 struct object *o;
 543                 const char *features;
 544                 unsigned char sha1_buf[20];
 545                 char *line = packet_read_line(0, NULL);
 546                 reset_timeout();
 547                 if (!line)
 548                         break;
 549
 550                 if (starts_with(line, "shallow ")) {
 551                         unsigned char sha1[20];
 552                         struct object *object;
 553                         if (get_sha1_hex(line + 8, sha1))
 554                                 die("invalid shallow line: %s", line);
 555                         object = parse_object(sha1);
 556                         if (!object)
 557                                 continue;
 558                         if (object->type != OBJ_COMMIT)
 559                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 560                         if (!(object->flags & CLIENT_SHALLOW)) {
 561                                 object->flags |= CLIENT_SHALLOW;
 562                                 add_object_array(object, NULL, &shallows);
 563                         }
 564                         continue;
 565                 }
 566                 if (starts_with(line, "deepen ")) {
 567                         char *end;
 568                         depth = strtol(line + 7, &end, 0);
 569                         if (end == line + 7 || depth <= 0)
 570                                 die("Invalid deepen: %s", line);
 571                         continue;
 572                 }
 573                 if (!starts_with(line, "want ") ||
 574                     get_sha1_hex(line+5, sha1_buf))
 575                         die("git upload-pack: protocol error, "
 576                             "expected to get sha, not '%s'", line);
 577
 578                 features = line + 45;
 579
 580                 if (parse_feature_request(features, "multi_ack_detailed"))
 581                         multi_ack = 2;
 582                 else if (parse_feature_request(features, "multi_ack"))
 583                         multi_ack = 1;
 584                 if (parse_feature_request(features, "no-done"))
 585                         no_done = 1;
 586                 if (parse_feature_request(features, "thin-pack"))
 587                         use_thin_pack = 1;
 588                 if (parse_feature_request(features, "ofs-delta"))
 589                         use_ofs_delta = 1;
 590                 if (parse_feature_request(features, "side-band-64k"))
 591                         use_sideband = LARGE_PACKET_MAX;
 592                 else if (parse_feature_request(features, "side-band"))
 593                         use_sideband = DEFAULT_PACKET_MAX;
 594                 if (parse_feature_request(features, "no-progress"))
 595                         no_progress = 1;
 596                 if (parse_feature_request(features, "include-tag"))
 597                         use_include_tag = 1;
 598
 599                 o = parse_object(sha1_buf);
 600                 if (!o)
 601                         die("git upload-pack: not our ref %s",
 602                             sha1_to_hex(sha1_buf));
 603                 if (!(o->flags & WANTED)) {
 604                         o->flags |= WANTED;
 605                         if (!is_our_ref(o))
 606                                 has_non_tip = 1;
 607                         add_object_array(o, NULL, &want_obj);
 608                 }
 609         }
 610
 611         /*
 612          * We have sent all our refs already, and the other end
 613          * should have chosen out of them. When we are operating
 614          * in the stateless RPC mode, however, their choice may
 615          * have been based on the set of older refs advertised
 616          * by another process that handled the initial request.
 617          */
 618         if (has_non_tip)
 619                 check_non_tip();
 620
 621         if (!use_sideband && daemon_mode)
 622                 no_progress = 1;
 623
 624         if (depth == 0 && shallows.nr == 0)
 625                 return;
 626         if (depth > 0) {
 627                 struct commit_list *result = NULL, *backup = NULL;
 628                 int i;
 629                 if (depth == INFINITE_DEPTH && !is_repository_shallow())
 630                         for (i = 0; i < shallows.nr; i++) {
 631                                 struct object *object = shallows.objects[i].item;
 632                                 object->flags |= NOT_SHALLOW;
 633                         }
 634                 else
 635                         backup = result =
 636                                 get_shallow_commits(&want_obj, depth,
 637                                                     SHALLOW, NOT_SHALLOW);
 638                 while (result) {
 639                         struct object *object = &result->item->object;
 640                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 641                                 packet_write(1, "shallow %s",
 642                                                 sha1_to_hex(object->sha1));
 643                                 register_shallow(object->sha1);
 644                                 shallow_nr++;
 645                         }
 646                         result = result->next;
 647                 }
 648                 free_commit_list(backup);
 649                 for (i = 0; i < shallows.nr; i++) {
 650                         struct object *object = shallows.objects[i].item;
 651                         if (object->flags & NOT_SHALLOW) {
 652                                 struct commit_list *parents;
 653                                 packet_write(1, "unshallow %s",
 654                                         sha1_to_hex(object->sha1));
 655                                 object->flags &= ~CLIENT_SHALLOW;
 656                                 /* make sure the real parents are parsed */
 657                                 unregister_shallow(object->sha1);
 658                                 object->parsed = 0;
 659                                 parse_commit_or_die((struct commit *)object);
 660                                 parents = ((struct commit *)object)->parents;
 661                                 while (parents) {
 662                                         add_object_array(&parents->item->object,
 663                                                         NULL, &want_obj);
 664                                         parents = parents->next;
 665                                 }
 666                                 add_object_array(object, NULL, &extra_edge_obj);
 667                         }
 668                         /* make sure commit traversal conforms to client */
 669                         register_shallow(object->sha1);
 670                 }
 671                 packet_flush(1);
 672         } else
 673                 if (shallows.nr > 0) {
 674                         int i;
 675                         for (i = 0; i < shallows.nr; i++)
 676                                 register_shallow(shallows.objects[i].item->sha1);
 677                 }
 678
 679         shallow_nr += shallows.nr;
 680         free(shallows.objects);
 681 }
 682
 683 /* return non-zero if the ref is hidden, otherwise 0 */
 684 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 685 {
 686         struct object *o = lookup_unknown_object(sha1);
 687
 688         if (ref_is_hidden(refname)) {
 689                 o->flags |= HIDDEN_REF;
 690                 return 1;
 691         }
 692         if (!o)
 693                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 694         o->flags |= OUR_REF;
 695         return 0;
 696 }
 697
 698 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 699 {
 700         struct string_list_item *item;
 701
 702         if (!symref->nr)
 703                 return;
 704         for_each_string_list_item(item, symref)
 705                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 706 }
 707
 708 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 709 {
 710         static const char *capabilities = "multi_ack thin-pack side-band"
 711                 " side-band-64k ofs-delta shallow no-progress"
 712                 " include-tag multi_ack_detailed";
 713         const char *refname_nons = strip_namespace(refname);
 714         unsigned char peeled[20];
 715
 716         if (mark_our_ref(refname, sha1, flag, NULL))
 717                 return 0;
 718
 719         if (capabilities) {
 720                 struct strbuf symref_info = STRBUF_INIT;
 721
 722                 format_symref_info(&symref_info, cb_data);
 723                 packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
 724                              sha1_to_hex(sha1), refname_nons,
 725                              0, capabilities,
 726                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 727                              stateless_rpc ? " no-done" : "",
 728                              symref_info.buf,
 729                              git_user_agent_sanitized());
 730                 strbuf_release(&symref_info);
 731         } else {
 732                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 733         }
 734         capabilities = NULL;
 735         if (!peel_ref(refname, peeled))
 736                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 737         return 0;
 738 }
 739
 740 static int find_symref(const char *refname, const unsigned char *sha1, int flag,
 741                        void *cb_data)
 742 {
 743         const char *symref_target;
 744         struct string_list_item *item;
 745         unsigned char unused[20];
 746
 747         if ((flag & REF_ISSYMREF) == 0)
 748                 return 0;
 749         symref_target = resolve_ref_unsafe(refname, 0, unused, &flag);
 750         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 751                 die("'%s' is a symref but it is not?", refname);
 752         item = string_list_append(cb_data, refname);
 753         item->util = xstrdup(symref_target);
 754         return 0;
 755 }
 756
 757 static void upload_pack(void)
 758 {
 759         struct string_list symref = STRING_LIST_INIT_DUP;
 760
 761         head_ref_namespaced(find_symref, &symref);
 762
 763         if (advertise_refs || !stateless_rpc) {
 764                 reset_timeout();
 765                 head_ref_namespaced(send_ref, &symref);
 766                 for_each_namespaced_ref(send_ref, &symref);
 767                 advertise_shallow_grafts(1);
 768                 packet_flush(1);
 769         } else {
 770                 head_ref_namespaced(mark_our_ref, NULL);
 771                 for_each_namespaced_ref(mark_our_ref, NULL);
 772         }
 773         string_list_clear(&symref, 1);
 774         if (advertise_refs)
 775                 return;
 776
 777         receive_needs();
 778         if (want_obj.nr) {
 779                 get_common_commits();
 780                 create_pack_file();
 781         }
 782 }
 783
 784 static int upload_pack_config(const char *var, const char *value, void *unused)
 785 {
 786         if (!strcmp("uploadpack.allowtipsha1inwant", var))
 787                 allow_tip_sha1_in_want = git_config_bool(var, value);
 788         else if (!strcmp("uploadpack.keepalive", var)) {
 789                 keepalive = git_config_int(var, value);
 790                 if (!keepalive)
 791                         keepalive = -1;
 792         }
 793         return parse_hide_refs_config(var, value, "uploadpack");
 794 }
 795
 796 int main(int argc, char **argv)
 797 {
 798         char *dir;
 799         int i;
 800         int strict = 0;
 801
 802         git_setup_gettext();
 803
 804         packet_trace_identity("upload-pack");
 805         git_extract_argv0_path(argv[0]);
 806         check_replace_refs = 0;
 807
 808         for (i = 1; i < argc; i++) {
 809                 char *arg = argv[i];
 810
 811                 if (arg[0] != '-')
 812                         break;
 813                 if (!strcmp(arg, "--advertise-refs")) {
 814                         advertise_refs = 1;
 815                         continue;
 816                 }
 817                 if (!strcmp(arg, "--stateless-rpc")) {
 818                         stateless_rpc = 1;
 819                         continue;
 820                 }
 821                 if (!strcmp(arg, "--strict")) {
 822                         strict = 1;
 823                         continue;
 824                 }
 825                 if (starts_with(arg, "--timeout=")) {
 826                         timeout = atoi(arg+10);
 827                         daemon_mode = 1;
 828                         continue;
 829                 }
 830                 if (!strcmp(arg, "--")) {
 831                         i++;
 832                         break;
 833                 }
 834         }
 835
 836         if (i != argc-1)
 837                 usage(upload_pack_usage);
 838
 839         setup_path();
 840
 841         dir = argv[i];
 842
 843         if (!enter_repo(dir, strict))
 844                 die("'%s' does not appear to be a git repository", dir);
 845
 846         git_config(upload_pack_config, NULL);
 847         upload_pack();
 848         return 0;
 849 }