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;
  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[12];
  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 (!no_progress)
 104                 argv[arg++] = "--progress";
 105         if (use_ofs_delta)
 106                 argv[arg++] = "--delta-base-offset";
 107         if (use_include_tag)
 108                 argv[arg++] = "--include-tag";
 109         argv[arg++] = NULL;
 110
 111         memset(&pack_objects, 0, sizeof(pack_objects));
 112         pack_objects.in = -1;
 113         pack_objects.out = -1;
 114         pack_objects.err = -1;
 115         pack_objects.git_cmd = 1;
 116         pack_objects.argv = argv;
 117
 118         if (start_command(&pack_objects))
 119                 die("git upload-pack: unable to fork git-pack-objects");
 120
 121         pipe_fd = xfdopen(pack_objects.in, "w");
 122
 123         if (shallow_nr)
 124                 for_each_commit_graft(write_one_shallow, pipe_fd);
 125
 126         for (i = 0; i < want_obj.nr; i++)
 127                 fprintf(pipe_fd, "%s\n",
 128                         sha1_to_hex(want_obj.objects[i].item->sha1));
 129         fprintf(pipe_fd, "--not\n");
 130         for (i = 0; i < have_obj.nr; i++)
 131                 fprintf(pipe_fd, "%s\n",
 132                         sha1_to_hex(have_obj.objects[i].item->sha1));
 133         for (i = 0; i < extra_edge_obj.nr; i++)
 134                 fprintf(pipe_fd, "%s\n",
 135                         sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
 136         fprintf(pipe_fd, "\n");
 137         fflush(pipe_fd);
 138         fclose(pipe_fd);
 139
 140         /* We read from pack_objects.err to capture stderr output for
 141          * progress bar, and pack_objects.out to capture the pack data.
 142          */
 143
 144         while (1) {
 145                 struct pollfd pfd[2];
 146                 int pe, pu, pollsize;
 147                 int ret;
 148
 149                 reset_timeout();
 150
 151                 pollsize = 0;
 152                 pe = pu = -1;
 153
 154                 if (0 <= pack_objects.out) {
 155                         pfd[pollsize].fd = pack_objects.out;
 156                         pfd[pollsize].events = POLLIN;
 157                         pu = pollsize;
 158                         pollsize++;
 159                 }
 160                 if (0 <= pack_objects.err) {
 161                         pfd[pollsize].fd = pack_objects.err;
 162                         pfd[pollsize].events = POLLIN;
 163                         pe = pollsize;
 164                         pollsize++;
 165                 }
 166
 167                 if (!pollsize)
 168                         break;
 169
 170                 ret = poll(pfd, pollsize, 1000 * keepalive);
 171                 if (ret < 0) {
 172                         if (errno != EINTR) {
 173                                 error("poll failed, resuming: %s",
 174                                       strerror(errno));
 175                                 sleep(1);
 176                         }
 177                         continue;
 178                 }
 179                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 180                         /* Status ready; we ship that in the side-band
 181                          * or dump to the standard error.
 182                          */
 183                         sz = xread(pack_objects.err, progress,
 184                                   sizeof(progress));
 185                         if (0 < sz)
 186                                 send_client_data(2, progress, sz);
 187                         else if (sz == 0) {
 188                                 close(pack_objects.err);
 189                                 pack_objects.err = -1;
 190                         }
 191                         else
 192                                 goto fail;
 193                         /* give priority to status messages */
 194                         continue;
 195                 }
 196                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 197                         /* Data ready; we keep the last byte to ourselves
 198                          * in case we detect broken rev-list, so that we
 199                          * can leave the stream corrupted.  This is
 200                          * unfortunate -- unpack-objects would happily
 201                          * accept a valid packdata with trailing garbage,
 202                          * so appending garbage after we pass all the
 203                          * pack data is not good enough to signal
 204                          * breakage to downstream.
 205                          */
 206                         char *cp = data;
 207                         ssize_t outsz = 0;
 208                         if (0 <= buffered) {
 209                                 *cp++ = buffered;
 210                                 outsz++;
 211                         }
 212                         sz = xread(pack_objects.out, cp,
 213                                   sizeof(data) - outsz);
 214                         if (0 < sz)
 215                                 ;
 216                         else if (sz == 0) {
 217                                 close(pack_objects.out);
 218                                 pack_objects.out = -1;
 219                         }
 220                         else
 221                                 goto fail;
 222                         sz += outsz;
 223                         if (1 < sz) {
 224                                 buffered = data[sz-1] & 0xFF;
 225                                 sz--;
 226                         }
 227                         else
 228                                 buffered = -1;
 229                         sz = send_client_data(1, data, sz);
 230                         if (sz < 0)
 231                                 goto fail;
 232                 }
 233
 234                 /*
 235                  * We hit the keepalive timeout without saying anything; send
 236                  * an empty message on the data sideband just to let the other
 237                  * side know we're still working on it, but don't have any data
 238                  * yet.
 239                  *
 240                  * If we don't have a sideband channel, there's no room in the
 241                  * protocol to say anything, so those clients are just out of
 242                  * luck.
 243                  */
 244                 if (!ret && use_sideband) {
 245                         static const char buf[] = "0005\1";
 246                         write_or_die(1, buf, 5);
 247                 }
 248         }
 249
 250         if (finish_command(&pack_objects)) {
 251                 error("git upload-pack: git-pack-objects died with error.");
 252                 goto fail;
 253         }
 254
 255         /* flush the data */
 256         if (0 <= buffered) {
 257                 data[0] = buffered;
 258                 sz = send_client_data(1, data, 1);
 259                 if (sz < 0)
 260                         goto fail;
 261                 fprintf(stderr, "flushed.\n");
 262         }
 263         if (use_sideband)
 264                 packet_flush(1);
 265         return;
 266
 267  fail:
 268         send_client_data(3, abort_msg, sizeof(abort_msg));
 269         die("git upload-pack: %s", abort_msg);
 270 }
 271
 272 static int got_sha1(char *hex, unsigned char *sha1)
 273 {
 274         struct object *o;
 275         int we_knew_they_have = 0;
 276
 277         if (get_sha1_hex(hex, sha1))
 278                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 279         if (!has_sha1_file(sha1))
 280                 return -1;
 281
 282         o = parse_object(sha1);
 283         if (!o)
 284                 die("oops (%s)", sha1_to_hex(sha1));
 285         if (o->type == OBJ_COMMIT) {
 286                 struct commit_list *parents;
 287                 struct commit *commit = (struct commit *)o;
 288                 if (o->flags & THEY_HAVE)
 289                         we_knew_they_have = 1;
 290                 else
 291                         o->flags |= THEY_HAVE;
 292                 if (!oldest_have || (commit->date < oldest_have))
 293                         oldest_have = commit->date;
 294                 for (parents = commit->parents;
 295                      parents;
 296                      parents = parents->next)
 297                         parents->item->object.flags |= THEY_HAVE;
 298         }
 299         if (!we_knew_they_have) {
 300                 add_object_array(o, NULL, &have_obj);
 301                 return 1;
 302         }
 303         return 0;
 304 }
 305
 306 static int reachable(struct commit *want)
 307 {
 308         struct commit_list *work = NULL;
 309
 310         commit_list_insert_by_date(want, &work);
 311         while (work) {
 312                 struct commit_list *list = work->next;
 313                 struct commit *commit = work->item;
 314                 free(work);
 315                 work = list;
 316
 317                 if (commit->object.flags & THEY_HAVE) {
 318                         want->object.flags |= COMMON_KNOWN;
 319                         break;
 320                 }
 321                 if (!commit->object.parsed)
 322                         parse_object(commit->object.sha1);
 323                 if (commit->object.flags & REACHABLE)
 324                         continue;
 325                 commit->object.flags |= REACHABLE;
 326                 if (commit->date < oldest_have)
 327                         continue;
 328                 for (list = commit->parents; list; list = list->next) {
 329                         struct commit *parent = list->item;
 330                         if (!(parent->object.flags & REACHABLE))
 331                                 commit_list_insert_by_date(parent, &work);
 332                 }
 333         }
 334         want->object.flags |= REACHABLE;
 335         clear_commit_marks(want, REACHABLE);
 336         free_commit_list(work);
 337         return (want->object.flags & COMMON_KNOWN);
 338 }
 339
 340 static int ok_to_give_up(void)
 341 {
 342         int i;
 343
 344         if (!have_obj.nr)
 345                 return 0;
 346
 347         for (i = 0; i < want_obj.nr; i++) {
 348                 struct object *want = want_obj.objects[i].item;
 349
 350                 if (want->flags & COMMON_KNOWN)
 351                         continue;
 352                 want = deref_tag(want, "a want line", 0);
 353                 if (!want || want->type != OBJ_COMMIT) {
 354                         /* no way to tell if this is reachable by
 355                          * looking at the ancestry chain alone, so
 356                          * leave a note to ourselves not to worry about
 357                          * this object anymore.
 358                          */
 359                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 360                         continue;
 361                 }
 362                 if (!reachable((struct commit *)want))
 363                         return 0;
 364         }
 365         return 1;
 366 }
 367
 368 static int get_common_commits(void)
 369 {
 370         unsigned char sha1[20];
 371         char last_hex[41];
 372         int got_common = 0;
 373         int got_other = 0;
 374         int sent_ready = 0;
 375
 376         save_commit_buffer = 0;
 377
 378         for (;;) {
 379                 char *line = packet_read_line(0, NULL);
 380                 reset_timeout();
 381
 382                 if (!line) {
 383                         if (multi_ack == 2 && got_common
 384                             && !got_other && ok_to_give_up()) {
 385                                 sent_ready = 1;
 386                                 packet_write(1, "ACK %s ready\n", last_hex);
 387                         }
 388                         if (have_obj.nr == 0 || multi_ack)
 389                                 packet_write(1, "NAK\n");
 390
 391                         if (no_done && sent_ready) {
 392                                 packet_write(1, "ACK %s\n", last_hex);
 393                                 return 0;
 394                         }
 395                         if (stateless_rpc)
 396                                 exit(0);
 397                         got_common = 0;
 398                         got_other = 0;
 399                         continue;
 400                 }
 401                 if (starts_with(line, "have ")) {
 402                         switch (got_sha1(line+5, sha1)) {
 403                         case -1: /* they have what we do not */
 404                                 got_other = 1;
 405                                 if (multi_ack && ok_to_give_up()) {
 406                                         const char *hex = sha1_to_hex(sha1);
 407                                         if (multi_ack == 2) {
 408                                                 sent_ready = 1;
 409                                                 packet_write(1, "ACK %s ready\n", hex);
 410                                         } else
 411                                                 packet_write(1, "ACK %s continue\n", hex);
 412                                 }
 413                                 break;
 414                         default:
 415                                 got_common = 1;
 416                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 417                                 if (multi_ack == 2)
 418                                         packet_write(1, "ACK %s common\n", last_hex);
 419                                 else if (multi_ack)
 420                                         packet_write(1, "ACK %s continue\n", last_hex);
 421                                 else if (have_obj.nr == 1)
 422                                         packet_write(1, "ACK %s\n", last_hex);
 423                                 break;
 424                         }
 425                         continue;
 426                 }
 427                 if (!strcmp(line, "done")) {
 428                         if (have_obj.nr > 0) {
 429                                 if (multi_ack)
 430                                         packet_write(1, "ACK %s\n", last_hex);
 431                                 return 0;
 432                         }
 433                         packet_write(1, "NAK\n");
 434                         return -1;
 435                 }
 436                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 437         }
 438 }
 439
 440 static int is_our_ref(struct object *o)
 441 {
 442         return o->flags &
 443                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 444 }
 445
 446 static void check_non_tip(void)
 447 {
 448         static const char *argv[] = {
 449                 "rev-list", "--stdin", NULL,
 450         };
 451         static struct child_process cmd;
 452         struct object *o;
 453         char namebuf[42]; /* ^ + SHA-1 + LF */
 454         int i;
 455
 456         /* In the normal in-process case non-tip request can never happen */
 457         if (!stateless_rpc)
 458                 goto error;
 459
 460         cmd.argv = argv;
 461         cmd.git_cmd = 1;
 462         cmd.no_stderr = 1;
 463         cmd.in = -1;
 464         cmd.out = -1;
 465
 466         if (start_command(&cmd))
 467                 goto error;
 468
 469         /*
 470          * If rev-list --stdin encounters an unknown commit, it
 471          * terminates, which will cause SIGPIPE in the write loop
 472          * below.
 473          */
 474         sigchain_push(SIGPIPE, SIG_IGN);
 475
 476         namebuf[0] = '^';
 477         namebuf[41] = '\n';
 478         for (i = get_max_object_index(); 0 < i; ) {
 479                 o = get_indexed_object(--i);
 480                 if (!o)
 481                         continue;
 482                 if (!is_our_ref(o))
 483                         continue;
 484                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 485                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 486                         goto error;
 487         }
 488         namebuf[40] = '\n';
 489         for (i = 0; i < want_obj.nr; i++) {
 490                 o = want_obj.objects[i].item;
 491                 if (is_our_ref(o))
 492                         continue;
 493                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 494                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 495                         goto error;
 496         }
 497         close(cmd.in);
 498
 499         sigchain_pop(SIGPIPE);
 500
 501         /*
 502          * The commits out of the rev-list are not ancestors of
 503          * our ref.
 504          */
 505         i = read_in_full(cmd.out, namebuf, 1);
 506         if (i)
 507                 goto error;
 508         close(cmd.out);
 509
 510         /*
 511          * rev-list may have died by encountering a bad commit
 512          * in the history, in which case we do want to bail out
 513          * even when it showed no commit.
 514          */
 515         if (finish_command(&cmd))
 516                 goto error;
 517
 518         /* All the non-tip ones are ancestors of what we advertised */
 519         return;
 520
 521 error:
 522         /* Pick one of them (we know there at least is one) */
 523         for (i = 0; i < want_obj.nr; i++) {
 524                 o = want_obj.objects[i].item;
 525                 if (!is_our_ref(o))
 526                         die("git upload-pack: not our ref %s",
 527                             sha1_to_hex(o->sha1));
 528         }
 529 }
 530
 531 static void receive_needs(void)
 532 {
 533         struct object_array shallows = OBJECT_ARRAY_INIT;
 534         int depth = 0;
 535         int has_non_tip = 0;
 536
 537         shallow_nr = 0;
 538         for (;;) {
 539                 struct object *o;
 540                 const char *features;
 541                 unsigned char sha1_buf[20];
 542                 char *line = packet_read_line(0, NULL);
 543                 reset_timeout();
 544                 if (!line)
 545                         break;
 546
 547                 if (starts_with(line, "shallow ")) {
 548                         unsigned char sha1[20];
 549                         struct object *object;
 550                         if (get_sha1_hex(line + 8, sha1))
 551                                 die("invalid shallow line: %s", line);
 552                         object = parse_object(sha1);
 553                         if (!object)
 554                                 continue;
 555                         if (object->type != OBJ_COMMIT)
 556                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 557                         if (!(object->flags & CLIENT_SHALLOW)) {
 558                                 object->flags |= CLIENT_SHALLOW;
 559                                 add_object_array(object, NULL, &shallows);
 560                         }
 561                         continue;
 562                 }
 563                 if (starts_with(line, "deepen ")) {
 564                         char *end;
 565                         depth = strtol(line + 7, &end, 0);
 566                         if (end == line + 7 || depth <= 0)
 567                                 die("Invalid deepen: %s", line);
 568                         continue;
 569                 }
 570                 if (!starts_with(line, "want ") ||
 571                     get_sha1_hex(line+5, sha1_buf))
 572                         die("git upload-pack: protocol error, "
 573                             "expected to get sha, not '%s'", line);
 574
 575                 features = line + 45;
 576
 577                 if (parse_feature_request(features, "multi_ack_detailed"))
 578                         multi_ack = 2;
 579                 else if (parse_feature_request(features, "multi_ack"))
 580                         multi_ack = 1;
 581                 if (parse_feature_request(features, "no-done"))
 582                         no_done = 1;
 583                 if (parse_feature_request(features, "thin-pack"))
 584                         use_thin_pack = 1;
 585                 if (parse_feature_request(features, "ofs-delta"))
 586                         use_ofs_delta = 1;
 587                 if (parse_feature_request(features, "side-band-64k"))
 588                         use_sideband = LARGE_PACKET_MAX;
 589                 else if (parse_feature_request(features, "side-band"))
 590                         use_sideband = DEFAULT_PACKET_MAX;
 591                 if (parse_feature_request(features, "no-progress"))
 592                         no_progress = 1;
 593                 if (parse_feature_request(features, "include-tag"))
 594                         use_include_tag = 1;
 595
 596                 o = parse_object(sha1_buf);
 597                 if (!o)
 598                         die("git upload-pack: not our ref %s",
 599                             sha1_to_hex(sha1_buf));
 600                 if (!(o->flags & WANTED)) {
 601                         o->flags |= WANTED;
 602                         if (!is_our_ref(o))
 603                                 has_non_tip = 1;
 604                         add_object_array(o, NULL, &want_obj);
 605                 }
 606         }
 607
 608         /*
 609          * We have sent all our refs already, and the other end
 610          * should have chosen out of them. When we are operating
 611          * in the stateless RPC mode, however, their choice may
 612          * have been based on the set of older refs advertised
 613          * by another process that handled the initial request.
 614          */
 615         if (has_non_tip)
 616                 check_non_tip();
 617
 618         if (!use_sideband && daemon_mode)
 619                 no_progress = 1;
 620
 621         if (depth == 0 && shallows.nr == 0)
 622                 return;
 623         if (depth > 0) {
 624                 struct commit_list *result = NULL, *backup = NULL;
 625                 int i;
 626                 if (depth == INFINITE_DEPTH && !is_repository_shallow())
 627                         for (i = 0; i < shallows.nr; i++) {
 628                                 struct object *object = shallows.objects[i].item;
 629                                 object->flags |= NOT_SHALLOW;
 630                         }
 631                 else
 632                         backup = result =
 633                                 get_shallow_commits(&want_obj, depth,
 634                                                     SHALLOW, NOT_SHALLOW);
 635                 while (result) {
 636                         struct object *object = &result->item->object;
 637                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 638                                 packet_write(1, "shallow %s",
 639                                                 sha1_to_hex(object->sha1));
 640                                 register_shallow(object->sha1);
 641                                 shallow_nr++;
 642                         }
 643                         result = result->next;
 644                 }
 645                 free_commit_list(backup);
 646                 for (i = 0; i < shallows.nr; i++) {
 647                         struct object *object = shallows.objects[i].item;
 648                         if (object->flags & NOT_SHALLOW) {
 649                                 struct commit_list *parents;
 650                                 packet_write(1, "unshallow %s",
 651                                         sha1_to_hex(object->sha1));
 652                                 object->flags &= ~CLIENT_SHALLOW;
 653                                 /* make sure the real parents are parsed */
 654                                 unregister_shallow(object->sha1);
 655                                 object->parsed = 0;
 656                                 parse_commit_or_die((struct commit *)object);
 657                                 parents = ((struct commit *)object)->parents;
 658                                 while (parents) {
 659                                         add_object_array(&parents->item->object,
 660                                                         NULL, &want_obj);
 661                                         parents = parents->next;
 662                                 }
 663                                 add_object_array(object, NULL, &extra_edge_obj);
 664                         }
 665                         /* make sure commit traversal conforms to client */
 666                         register_shallow(object->sha1);
 667                 }
 668                 packet_flush(1);
 669         } else
 670                 if (shallows.nr > 0) {
 671                         int i;
 672                         for (i = 0; i < shallows.nr; i++)
 673                                 register_shallow(shallows.objects[i].item->sha1);
 674                 }
 675
 676         shallow_nr += shallows.nr;
 677         free(shallows.objects);
 678 }
 679
 680 /* return non-zero if the ref is hidden, otherwise 0 */
 681 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 682 {
 683         struct object *o = lookup_unknown_object(sha1);
 684
 685         if (ref_is_hidden(refname)) {
 686                 o->flags |= HIDDEN_REF;
 687                 return 1;
 688         }
 689         if (!o)
 690                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 691         o->flags |= OUR_REF;
 692         return 0;
 693 }
 694
 695 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 696 {
 697         struct string_list_item *item;
 698
 699         if (!symref->nr)
 700                 return;
 701         for_each_string_list_item(item, symref)
 702                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 703 }
 704
 705 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 706 {
 707         static const char *capabilities = "multi_ack thin-pack side-band"
 708                 " side-band-64k ofs-delta shallow no-progress"
 709                 " include-tag multi_ack_detailed";
 710         const char *refname_nons = strip_namespace(refname);
 711         unsigned char peeled[20];
 712
 713         if (mark_our_ref(refname, sha1, flag, NULL))
 714                 return 0;
 715
 716         if (capabilities) {
 717                 struct strbuf symref_info = STRBUF_INIT;
 718
 719                 format_symref_info(&symref_info, cb_data);
 720                 packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
 721                              sha1_to_hex(sha1), refname_nons,
 722                              0, capabilities,
 723                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 724                              stateless_rpc ? " no-done" : "",
 725                              symref_info.buf,
 726                              git_user_agent_sanitized());
 727                 strbuf_release(&symref_info);
 728         } else {
 729                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 730         }
 731         capabilities = NULL;
 732         if (!peel_ref(refname, peeled))
 733                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 734         return 0;
 735 }
 736
 737 static int find_symref(const char *refname, const unsigned char *sha1, int flag,
 738                        void *cb_data)
 739 {
 740         const char *symref_target;
 741         struct string_list_item *item;
 742         unsigned char unused[20];
 743
 744         if ((flag & REF_ISSYMREF) == 0)
 745                 return 0;
 746         symref_target = resolve_ref_unsafe(refname, unused, 0, &flag);
 747         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 748                 die("'%s' is a symref but it is not?", refname);
 749         item = string_list_append(cb_data, refname);
 750         item->util = xstrdup(symref_target);
 751         return 0;
 752 }
 753
 754 static void upload_pack(void)
 755 {
 756         struct string_list symref = STRING_LIST_INIT_DUP;
 757
 758         head_ref_namespaced(find_symref, &symref);
 759
 760         if (advertise_refs || !stateless_rpc) {
 761                 reset_timeout();
 762                 head_ref_namespaced(send_ref, &symref);
 763                 for_each_namespaced_ref(send_ref, &symref);
 764                 advertise_shallow_grafts(1);
 765                 packet_flush(1);
 766         } else {
 767                 head_ref_namespaced(mark_our_ref, NULL);
 768                 for_each_namespaced_ref(mark_our_ref, NULL);
 769         }
 770         string_list_clear(&symref, 1);
 771         if (advertise_refs)
 772                 return;
 773
 774         receive_needs();
 775         if (want_obj.nr) {
 776                 get_common_commits();
 777                 create_pack_file();
 778         }
 779 }
 780
 781 static int upload_pack_config(const char *var, const char *value, void *unused)
 782 {
 783         if (!strcmp("uploadpack.allowtipsha1inwant", var))
 784                 allow_tip_sha1_in_want = git_config_bool(var, value);
 785         else if (!strcmp("uploadpack.keepalive", var)) {
 786                 keepalive = git_config_int(var, value);
 787                 if (!keepalive)
 788                         keepalive = -1;
 789         }
 790         return parse_hide_refs_config(var, value, "uploadpack");
 791 }
 792
 793 int main(int argc, char **argv)
 794 {
 795         char *dir;
 796         int i;
 797         int strict = 0;
 798
 799         git_setup_gettext();
 800
 801         packet_trace_identity("upload-pack");
 802         git_extract_argv0_path(argv[0]);
 803         check_replace_refs = 0;
 804
 805         for (i = 1; i < argc; i++) {
 806                 char *arg = argv[i];
 807
 808                 if (arg[0] != '-')
 809                         break;
 810                 if (!strcmp(arg, "--advertise-refs")) {
 811                         advertise_refs = 1;
 812                         continue;
 813                 }
 814                 if (!strcmp(arg, "--stateless-rpc")) {
 815                         stateless_rpc = 1;
 816                         continue;
 817                 }
 818                 if (!strcmp(arg, "--strict")) {
 819                         strict = 1;
 820                         continue;
 821                 }
 822                 if (starts_with(arg, "--timeout=")) {
 823                         timeout = atoi(arg+10);
 824                         daemon_mode = 1;
 825                         continue;
 826                 }
 827                 if (!strcmp(arg, "--")) {
 828                         i++;
 829                         break;
 830                 }
 831         }
 832
 833         if (i != argc-1)
 834                 usage(upload_pack_usage);
 835
 836         setup_path();
 837
 838         dir = argv[i];
 839
 840         if (!enter_repo(dir, strict))
 841                 die("'%s' does not appear to be a git repository", dir);
 842
 843         git_config(upload_pack_config, NULL);
 844         upload_pack();
 845         return 0;
 846 }