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

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "pkt-line.h"
   4 #include "sideband.h"
   5 #include "tag.h"
   6 #include "object.h"
   7 #include "commit.h"
   8 #include "exec_cmd.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "list-objects.h"
  12 #include "run-command.h"
  13 #include "connect.h"
  14 #include "sigchain.h"
  15 #include "version.h"
  16 #include "string-list.h"
  17
  18 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  19
  20 /* Remember to update object flag allocation in object.h */
  21 #define THEY_HAVE       (1u << 11)
  22 #define OUR_REF         (1u << 12)
  23 #define WANTED          (1u << 13)
  24 #define COMMON_KNOWN    (1u << 14)
  25 #define REACHABLE       (1u << 15)
  26
  27 #define SHALLOW         (1u << 16)
  28 #define NOT_SHALLOW     (1u << 17)
  29 #define CLIENT_SHALLOW  (1u << 18)
  30 #define HIDDEN_REF      (1u << 19)
  31
  32 static unsigned long oldest_have;
  33
  34 static int multi_ack;
  35 static int no_done;
  36 static int use_thin_pack, use_ofs_delta, use_include_tag;
  37 static int no_progress, daemon_mode;
  38 /* Allow specifying sha1 if it is a ref tip. */
  39 #define ALLOW_TIP_SHA1  01
  40 static unsigned int allow_unadvertised_object_request;
  41 static int shallow_nr;
  42 static struct object_array have_obj;
  43 static struct object_array want_obj;
  44 static struct object_array extra_edge_obj;
  45 static unsigned int timeout;
  46 static int keepalive = 5;
  47 /* 0 for no sideband,
  48  * otherwise maximum packet size (up to 65520 bytes).
  49  */
  50 static int use_sideband;
  51 static int advertise_refs;
  52 static int stateless_rpc;
  53
  54 static void reset_timeout(void)
  55 {
  56         alarm(timeout);
  57 }
  58
  59 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  60 {
  61         if (use_sideband)
  62                 return send_sideband(1, fd, data, sz, use_sideband);
  63         if (fd == 3)
  64                 /* emergency quit */
  65                 fd = 2;
  66         if (fd == 2) {
  67                 /* XXX: are we happy to lose stuff here? */
  68                 xwrite(fd, data, sz);
  69                 return sz;
  70         }
  71         write_or_die(fd, data, sz);
  72         return sz;
  73 }
  74
  75 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  76 {
  77         FILE *fp = cb_data;
  78         if (graft->nr_parent == -1)
  79                 fprintf(fp, "--shallow %s\n", sha1_to_hex(graft->sha1));
  80         return 0;
  81 }
  82
  83 static void create_pack_file(void)
  84 {
  85         struct child_process pack_objects = CHILD_PROCESS_INIT;
  86         char data[8193], progress[128];
  87         char abort_msg[] = "aborting due to possible repository "
  88                 "corruption on the remote side.";
  89         int buffered = -1;
  90         ssize_t sz;
  91         const char *argv[13];
  92         int i, arg = 0;
  93         FILE *pipe_fd;
  94
  95         if (shallow_nr) {
  96                 argv[arg++] = "--shallow-file";
  97                 argv[arg++] = "";
  98         }
  99         argv[arg++] = "pack-objects";
 100         argv[arg++] = "--revs";
 101         if (use_thin_pack)
 102                 argv[arg++] = "--thin";
 103
 104         argv[arg++] = "--stdout";
 105         if (shallow_nr)
 106                 argv[arg++] = "--shallow";
 107         if (!no_progress)
 108                 argv[arg++] = "--progress";
 109         if (use_ofs_delta)
 110                 argv[arg++] = "--delta-base-offset";
 111         if (use_include_tag)
 112                 argv[arg++] = "--include-tag";
 113         argv[arg++] = NULL;
 114
 115         pack_objects.in = -1;
 116         pack_objects.out = -1;
 117         pack_objects.err = -1;
 118         pack_objects.git_cmd = 1;
 119         pack_objects.argv = argv;
 120
 121         if (start_command(&pack_objects))
 122                 die("git upload-pack: unable to fork git-pack-objects");
 123
 124         pipe_fd = xfdopen(pack_objects.in, "w");
 125
 126         if (shallow_nr)
 127                 for_each_commit_graft(write_one_shallow, pipe_fd);
 128
 129         for (i = 0; i < want_obj.nr; i++)
 130                 fprintf(pipe_fd, "%s\n",
 131                         sha1_to_hex(want_obj.objects[i].item->sha1));
 132         fprintf(pipe_fd, "--not\n");
 133         for (i = 0; i < have_obj.nr; i++)
 134                 fprintf(pipe_fd, "%s\n",
 135                         sha1_to_hex(have_obj.objects[i].item->sha1));
 136         for (i = 0; i < extra_edge_obj.nr; i++)
 137                 fprintf(pipe_fd, "%s\n",
 138                         sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
 139         fprintf(pipe_fd, "\n");
 140         fflush(pipe_fd);
 141         fclose(pipe_fd);
 142
 143         /* We read from pack_objects.err to capture stderr output for
 144          * progress bar, and pack_objects.out to capture the pack data.
 145          */
 146
 147         while (1) {
 148                 struct pollfd pfd[2];
 149                 int pe, pu, pollsize;
 150                 int ret;
 151
 152                 reset_timeout();
 153
 154                 pollsize = 0;
 155                 pe = pu = -1;
 156
 157                 if (0 <= pack_objects.out) {
 158                         pfd[pollsize].fd = pack_objects.out;
 159                         pfd[pollsize].events = POLLIN;
 160                         pu = pollsize;
 161                         pollsize++;
 162                 }
 163                 if (0 <= pack_objects.err) {
 164                         pfd[pollsize].fd = pack_objects.err;
 165                         pfd[pollsize].events = POLLIN;
 166                         pe = pollsize;
 167                         pollsize++;
 168                 }
 169
 170                 if (!pollsize)
 171                         break;
 172
 173                 ret = poll(pfd, pollsize,
 174                         keepalive < 0 ? -1 : 1000 * keepalive);
 175
 176                 if (ret < 0) {
 177                         if (errno != EINTR) {
 178                                 error("poll failed, resuming: %s",
 179                                       strerror(errno));
 180                                 sleep(1);
 181                         }
 182                         continue;
 183                 }
 184                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 185                         /* Status ready; we ship that in the side-band
 186                          * or dump to the standard error.
 187                          */
 188                         sz = xread(pack_objects.err, progress,
 189                                   sizeof(progress));
 190                         if (0 < sz)
 191                                 send_client_data(2, progress, sz);
 192                         else if (sz == 0) {
 193                                 close(pack_objects.err);
 194                                 pack_objects.err = -1;
 195                         }
 196                         else
 197                                 goto fail;
 198                         /* give priority to status messages */
 199                         continue;
 200                 }
 201                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 202                         /* Data ready; we keep the last byte to ourselves
 203                          * in case we detect broken rev-list, so that we
 204                          * can leave the stream corrupted.  This is
 205                          * unfortunate -- unpack-objects would happily
 206                          * accept a valid packdata with trailing garbage,
 207                          * so appending garbage after we pass all the
 208                          * pack data is not good enough to signal
 209                          * breakage to downstream.
 210                          */
 211                         char *cp = data;
 212                         ssize_t outsz = 0;
 213                         if (0 <= buffered) {
 214                                 *cp++ = buffered;
 215                                 outsz++;
 216                         }
 217                         sz = xread(pack_objects.out, cp,
 218                                   sizeof(data) - outsz);
 219                         if (0 < sz)
 220                                 ;
 221                         else if (sz == 0) {
 222                                 close(pack_objects.out);
 223                                 pack_objects.out = -1;
 224                         }
 225                         else
 226                                 goto fail;
 227                         sz += outsz;
 228                         if (1 < sz) {
 229                                 buffered = data[sz-1] & 0xFF;
 230                                 sz--;
 231                         }
 232                         else
 233                                 buffered = -1;
 234                         sz = send_client_data(1, data, sz);
 235                         if (sz < 0)
 236                                 goto fail;
 237                 }
 238
 239                 /*
 240                  * We hit the keepalive timeout without saying anything; send
 241                  * an empty message on the data sideband just to let the other
 242                  * side know we're still working on it, but don't have any data
 243                  * yet.
 244                  *
 245                  * If we don't have a sideband channel, there's no room in the
 246                  * protocol to say anything, so those clients are just out of
 247                  * luck.
 248                  */
 249                 if (!ret && use_sideband) {
 250                         static const char buf[] = "0005\1";
 251                         write_or_die(1, buf, 5);
 252                 }
 253         }
 254
 255         if (finish_command(&pack_objects)) {
 256                 error("git upload-pack: git-pack-objects died with error.");
 257                 goto fail;
 258         }
 259
 260         /* flush the data */
 261         if (0 <= buffered) {
 262                 data[0] = buffered;
 263                 sz = send_client_data(1, data, 1);
 264                 if (sz < 0)
 265                         goto fail;
 266                 fprintf(stderr, "flushed.\n");
 267         }
 268         if (use_sideband)
 269                 packet_flush(1);
 270         return;
 271
 272  fail:
 273         send_client_data(3, abort_msg, sizeof(abort_msg));
 274         die("git upload-pack: %s", abort_msg);
 275 }
 276
 277 static int got_sha1(char *hex, unsigned char *sha1)
 278 {
 279         struct object *o;
 280         int we_knew_they_have = 0;
 281
 282         if (get_sha1_hex(hex, sha1))
 283                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 284         if (!has_sha1_file(sha1))
 285                 return -1;
 286
 287         o = parse_object(sha1);
 288         if (!o)
 289                 die("oops (%s)", sha1_to_hex(sha1));
 290         if (o->type == OBJ_COMMIT) {
 291                 struct commit_list *parents;
 292                 struct commit *commit = (struct commit *)o;
 293                 if (o->flags & THEY_HAVE)
 294                         we_knew_they_have = 1;
 295                 else
 296                         o->flags |= THEY_HAVE;
 297                 if (!oldest_have || (commit->date < oldest_have))
 298                         oldest_have = commit->date;
 299                 for (parents = commit->parents;
 300                      parents;
 301                      parents = parents->next)
 302                         parents->item->object.flags |= THEY_HAVE;
 303         }
 304         if (!we_knew_they_have) {
 305                 add_object_array(o, NULL, &have_obj);
 306                 return 1;
 307         }
 308         return 0;
 309 }
 310
 311 static int reachable(struct commit *want)
 312 {
 313         struct commit_list *work = NULL;
 314
 315         commit_list_insert_by_date(want, &work);
 316         while (work) {
 317                 struct commit_list *list = work->next;
 318                 struct commit *commit = work->item;
 319                 free(work);
 320                 work = list;
 321
 322                 if (commit->object.flags & THEY_HAVE) {
 323                         want->object.flags |= COMMON_KNOWN;
 324                         break;
 325                 }
 326                 if (!commit->object.parsed)
 327                         parse_object(commit->object.sha1);
 328                 if (commit->object.flags & REACHABLE)
 329                         continue;
 330                 commit->object.flags |= REACHABLE;
 331                 if (commit->date < oldest_have)
 332                         continue;
 333                 for (list = commit->parents; list; list = list->next) {
 334                         struct commit *parent = list->item;
 335                         if (!(parent->object.flags & REACHABLE))
 336                                 commit_list_insert_by_date(parent, &work);
 337                 }
 338         }
 339         want->object.flags |= REACHABLE;
 340         clear_commit_marks(want, REACHABLE);
 341         free_commit_list(work);
 342         return (want->object.flags & COMMON_KNOWN);
 343 }
 344
 345 static int ok_to_give_up(void)
 346 {
 347         int i;
 348
 349         if (!have_obj.nr)
 350                 return 0;
 351
 352         for (i = 0; i < want_obj.nr; i++) {
 353                 struct object *want = want_obj.objects[i].item;
 354
 355                 if (want->flags & COMMON_KNOWN)
 356                         continue;
 357                 want = deref_tag(want, "a want line", 0);
 358                 if (!want || want->type != OBJ_COMMIT) {
 359                         /* no way to tell if this is reachable by
 360                          * looking at the ancestry chain alone, so
 361                          * leave a note to ourselves not to worry about
 362                          * this object anymore.
 363                          */
 364                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 365                         continue;
 366                 }
 367                 if (!reachable((struct commit *)want))
 368                         return 0;
 369         }
 370         return 1;
 371 }
 372
 373 static int get_common_commits(void)
 374 {
 375         unsigned char sha1[20];
 376         char last_hex[41];
 377         int got_common = 0;
 378         int got_other = 0;
 379         int sent_ready = 0;
 380
 381         save_commit_buffer = 0;
 382
 383         for (;;) {
 384                 char *line = packet_read_line(0, NULL);
 385                 reset_timeout();
 386
 387                 if (!line) {
 388                         if (multi_ack == 2 && got_common
 389                             && !got_other && ok_to_give_up()) {
 390                                 sent_ready = 1;
 391                                 packet_write(1, "ACK %s ready\n", last_hex);
 392                         }
 393                         if (have_obj.nr == 0 || multi_ack)
 394                                 packet_write(1, "NAK\n");
 395
 396                         if (no_done && sent_ready) {
 397                                 packet_write(1, "ACK %s\n", last_hex);
 398                                 return 0;
 399                         }
 400                         if (stateless_rpc)
 401                                 exit(0);
 402                         got_common = 0;
 403                         got_other = 0;
 404                         continue;
 405                 }
 406                 if (starts_with(line, "have ")) {
 407                         switch (got_sha1(line+5, sha1)) {
 408                         case -1: /* they have what we do not */
 409                                 got_other = 1;
 410                                 if (multi_ack && ok_to_give_up()) {
 411                                         const char *hex = sha1_to_hex(sha1);
 412                                         if (multi_ack == 2) {
 413                                                 sent_ready = 1;
 414                                                 packet_write(1, "ACK %s ready\n", hex);
 415                                         } else
 416                                                 packet_write(1, "ACK %s continue\n", hex);
 417                                 }
 418                                 break;
 419                         default:
 420                                 got_common = 1;
 421                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 422                                 if (multi_ack == 2)
 423                                         packet_write(1, "ACK %s common\n", last_hex);
 424                                 else if (multi_ack)
 425                                         packet_write(1, "ACK %s continue\n", last_hex);
 426                                 else if (have_obj.nr == 1)
 427                                         packet_write(1, "ACK %s\n", last_hex);
 428                                 break;
 429                         }
 430                         continue;
 431                 }
 432                 if (!strcmp(line, "done")) {
 433                         if (have_obj.nr > 0) {
 434                                 if (multi_ack)
 435                                         packet_write(1, "ACK %s\n", last_hex);
 436                                 return 0;
 437                         }
 438                         packet_write(1, "NAK\n");
 439                         return -1;
 440                 }
 441                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 442         }
 443 }
 444
 445 static int is_our_ref(struct object *o)
 446 {
 447         int allow_hidden_ref = (allow_unadvertised_object_request & ALLOW_TIP_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         /* In the normal in-process case non-tip request can never happen */
 462         if (!stateless_rpc)
 463                 goto error;
 464
 465         cmd.argv = argv;
 466         cmd.git_cmd = 1;
 467         cmd.no_stderr = 1;
 468         cmd.in = -1;
 469         cmd.out = -1;
 470
 471         if (start_command(&cmd))
 472                 goto error;
 473
 474         /*
 475          * If rev-list --stdin encounters an unknown commit, it
 476          * terminates, which will cause SIGPIPE in the write loop
 477          * below.
 478          */
 479         sigchain_push(SIGPIPE, SIG_IGN);
 480
 481         namebuf[0] = '^';
 482         namebuf[41] = '\n';
 483         for (i = get_max_object_index(); 0 < i; ) {
 484                 o = get_indexed_object(--i);
 485                 if (!o)
 486                         continue;
 487                 if (!is_our_ref(o))
 488                         continue;
 489                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 490                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 491                         goto error;
 492         }
 493         namebuf[40] = '\n';
 494         for (i = 0; i < want_obj.nr; i++) {
 495                 o = want_obj.objects[i].item;
 496                 if (is_our_ref(o))
 497                         continue;
 498                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 499                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 500                         goto error;
 501         }
 502         close(cmd.in);
 503
 504         sigchain_pop(SIGPIPE);
 505
 506         /*
 507          * The commits out of the rev-list are not ancestors of
 508          * our ref.
 509          */
 510         i = read_in_full(cmd.out, namebuf, 1);
 511         if (i)
 512                 goto error;
 513         close(cmd.out);
 514
 515         /*
 516          * rev-list may have died by encountering a bad commit
 517          * in the history, in which case we do want to bail out
 518          * even when it showed no commit.
 519          */
 520         if (finish_command(&cmd))
 521                 goto error;
 522
 523         /* All the non-tip ones are ancestors of what we advertised */
 524         return;
 525
 526 error:
 527         /* Pick one of them (we know there at least is one) */
 528         for (i = 0; i < want_obj.nr; i++) {
 529                 o = want_obj.objects[i].item;
 530                 if (!is_our_ref(o))
 531                         die("git upload-pack: not our ref %s",
 532                             sha1_to_hex(o->sha1));
 533         }
 534 }
 535
 536 static void receive_needs(void)
 537 {
 538         struct object_array shallows = OBJECT_ARRAY_INIT;
 539         int depth = 0;
 540         int has_non_tip = 0;
 541
 542         shallow_nr = 0;
 543         for (;;) {
 544                 struct object *o;
 545                 const char *features;
 546                 unsigned char sha1_buf[20];
 547                 char *line = packet_read_line(0, NULL);
 548                 reset_timeout();
 549                 if (!line)
 550                         break;
 551
 552                 if (starts_with(line, "shallow ")) {
 553                         unsigned char sha1[20];
 554                         struct object *object;
 555                         if (get_sha1_hex(line + 8, sha1))
 556                                 die("invalid shallow line: %s", line);
 557                         object = parse_object(sha1);
 558                         if (!object)
 559                                 continue;
 560                         if (object->type != OBJ_COMMIT)
 561                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 562                         if (!(object->flags & CLIENT_SHALLOW)) {
 563                                 object->flags |= CLIENT_SHALLOW;
 564                                 add_object_array(object, NULL, &shallows);
 565                         }
 566                         continue;
 567                 }
 568                 if (starts_with(line, "deepen ")) {
 569                         char *end;
 570                         depth = strtol(line + 7, &end, 0);
 571                         if (end == line + 7 || depth <= 0)
 572                                 die("Invalid deepen: %s", line);
 573                         continue;
 574                 }
 575                 if (!starts_with(line, "want ") ||
 576                     get_sha1_hex(line+5, sha1_buf))
 577                         die("git upload-pack: protocol error, "
 578                             "expected to get sha, not '%s'", line);
 579
 580                 features = line + 45;
 581
 582                 if (parse_feature_request(features, "multi_ack_detailed"))
 583                         multi_ack = 2;
 584                 else if (parse_feature_request(features, "multi_ack"))
 585                         multi_ack = 1;
 586                 if (parse_feature_request(features, "no-done"))
 587                         no_done = 1;
 588                 if (parse_feature_request(features, "thin-pack"))
 589                         use_thin_pack = 1;
 590                 if (parse_feature_request(features, "ofs-delta"))
 591                         use_ofs_delta = 1;
 592                 if (parse_feature_request(features, "side-band-64k"))
 593                         use_sideband = LARGE_PACKET_MAX;
 594                 else if (parse_feature_request(features, "side-band"))
 595                         use_sideband = DEFAULT_PACKET_MAX;
 596                 if (parse_feature_request(features, "no-progress"))
 597                         no_progress = 1;
 598                 if (parse_feature_request(features, "include-tag"))
 599                         use_include_tag = 1;
 600
 601                 o = parse_object(sha1_buf);
 602                 if (!o)
 603                         die("git upload-pack: not our ref %s",
 604                             sha1_to_hex(sha1_buf));
 605                 if (!(o->flags & WANTED)) {
 606                         o->flags |= WANTED;
 607                         if (!is_our_ref(o))
 608                                 has_non_tip = 1;
 609                         add_object_array(o, NULL, &want_obj);
 610                 }
 611         }
 612
 613         /*
 614          * We have sent all our refs already, and the other end
 615          * should have chosen out of them. When we are operating
 616          * in the stateless RPC mode, however, their choice may
 617          * have been based on the set of older refs advertised
 618          * by another process that handled the initial request.
 619          */
 620         if (has_non_tip)
 621                 check_non_tip();
 622
 623         if (!use_sideband && daemon_mode)
 624                 no_progress = 1;
 625
 626         if (depth == 0 && shallows.nr == 0)
 627                 return;
 628         if (depth > 0) {
 629                 struct commit_list *result = NULL, *backup = NULL;
 630                 int i;
 631                 if (depth == INFINITE_DEPTH && !is_repository_shallow())
 632                         for (i = 0; i < shallows.nr; i++) {
 633                                 struct object *object = shallows.objects[i].item;
 634                                 object->flags |= NOT_SHALLOW;
 635                         }
 636                 else
 637                         backup = result =
 638                                 get_shallow_commits(&want_obj, depth,
 639                                                     SHALLOW, NOT_SHALLOW);
 640                 while (result) {
 641                         struct object *object = &result->item->object;
 642                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 643                                 packet_write(1, "shallow %s",
 644                                                 sha1_to_hex(object->sha1));
 645                                 register_shallow(object->sha1);
 646                                 shallow_nr++;
 647                         }
 648                         result = result->next;
 649                 }
 650                 free_commit_list(backup);
 651                 for (i = 0; i < shallows.nr; i++) {
 652                         struct object *object = shallows.objects[i].item;
 653                         if (object->flags & NOT_SHALLOW) {
 654                                 struct commit_list *parents;
 655                                 packet_write(1, "unshallow %s",
 656                                         sha1_to_hex(object->sha1));
 657                                 object->flags &= ~CLIENT_SHALLOW;
 658                                 /* make sure the real parents are parsed */
 659                                 unregister_shallow(object->sha1);
 660                                 object->parsed = 0;
 661                                 parse_commit_or_die((struct commit *)object);
 662                                 parents = ((struct commit *)object)->parents;
 663                                 while (parents) {
 664                                         add_object_array(&parents->item->object,
 665                                                         NULL, &want_obj);
 666                                         parents = parents->next;
 667                                 }
 668                                 add_object_array(object, NULL, &extra_edge_obj);
 669                         }
 670                         /* make sure commit traversal conforms to client */
 671                         register_shallow(object->sha1);
 672                 }
 673                 packet_flush(1);
 674         } else
 675                 if (shallows.nr > 0) {
 676                         int i;
 677                         for (i = 0; i < shallows.nr; i++)
 678                                 register_shallow(shallows.objects[i].item->sha1);
 679                 }
 680
 681         shallow_nr += shallows.nr;
 682         free(shallows.objects);
 683 }
 684
 685 /* return non-zero if the ref is hidden, otherwise 0 */
 686 static int mark_our_ref(const char *refname, const unsigned char *sha1)
 687 {
 688         struct object *o = lookup_unknown_object(sha1);
 689
 690         if (ref_is_hidden(refname)) {
 691                 o->flags |= HIDDEN_REF;
 692                 return 1;
 693         }
 694         o->flags |= OUR_REF;
 695         return 0;
 696 }
 697
 698 static int check_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 699 {
 700         mark_our_ref(refname, sha1);
 701         return 0;
 702 }
 703
 704 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 705 {
 706         struct string_list_item *item;
 707
 708         if (!symref->nr)
 709                 return;
 710         for_each_string_list_item(item, symref)
 711                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 712 }
 713
 714 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 715 {
 716         static const char *capabilities = "multi_ack thin-pack side-band"
 717                 " side-band-64k ofs-delta shallow no-progress"
 718                 " include-tag multi_ack_detailed";
 719         const char *refname_nons = strip_namespace(refname);
 720         unsigned char peeled[20];
 721
 722         if (mark_our_ref(refname, sha1))
 723                 return 0;
 724
 725         if (capabilities) {
 726                 struct strbuf symref_info = STRBUF_INIT;
 727
 728                 format_symref_info(&symref_info, cb_data);
 729                 packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
 730                              sha1_to_hex(sha1), refname_nons,
 731                              0, capabilities,
 732                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 733                                      " allow-tip-sha1-in-want" : "",
 734                              stateless_rpc ? " no-done" : "",
 735                              symref_info.buf,
 736                              git_user_agent_sanitized());
 737                 strbuf_release(&symref_info);
 738         } else {
 739                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 740         }
 741         capabilities = NULL;
 742         if (!peel_ref(refname, peeled))
 743                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 744         return 0;
 745 }
 746
 747 static int find_symref(const char *refname, const unsigned char *sha1, int flag,
 748                        void *cb_data)
 749 {
 750         const char *symref_target;
 751         struct string_list_item *item;
 752         unsigned char unused[20];
 753
 754         if ((flag & REF_ISSYMREF) == 0)
 755                 return 0;
 756         symref_target = resolve_ref_unsafe(refname, 0, unused, &flag);
 757         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 758                 die("'%s' is a symref but it is not?", refname);
 759         item = string_list_append(cb_data, refname);
 760         item->util = xstrdup(symref_target);
 761         return 0;
 762 }
 763
 764 static void upload_pack(void)
 765 {
 766         struct string_list symref = STRING_LIST_INIT_DUP;
 767
 768         head_ref_namespaced(find_symref, &symref);
 769
 770         if (advertise_refs || !stateless_rpc) {
 771                 reset_timeout();
 772                 head_ref_namespaced(send_ref, &symref);
 773                 for_each_namespaced_ref(send_ref, &symref);
 774                 advertise_shallow_grafts(1);
 775                 packet_flush(1);
 776         } else {
 777                 head_ref_namespaced(check_ref, NULL);
 778                 for_each_namespaced_ref(check_ref, NULL);
 779         }
 780         string_list_clear(&symref, 1);
 781         if (advertise_refs)
 782                 return;
 783
 784         receive_needs();
 785         if (want_obj.nr) {
 786                 get_common_commits();
 787                 create_pack_file();
 788         }
 789 }
 790
 791 static int upload_pack_config(const char *var, const char *value, void *unused)
 792 {
 793         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
 794                 if (git_config_bool(var, value))
 795                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
 796                 else
 797                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
 798         } else if (!strcmp("uploadpack.keepalive", var)) {
 799                 keepalive = git_config_int(var, value);
 800                 if (!keepalive)
 801                         keepalive = -1;
 802         }
 803         return parse_hide_refs_config(var, value, "uploadpack");
 804 }
 805
 806 int main(int argc, char **argv)
 807 {
 808         char *dir;
 809         int i;
 810         int strict = 0;
 811
 812         git_setup_gettext();
 813
 814         packet_trace_identity("upload-pack");
 815         git_extract_argv0_path(argv[0]);
 816         check_replace_refs = 0;
 817
 818         for (i = 1; i < argc; i++) {
 819                 char *arg = argv[i];
 820
 821                 if (arg[0] != '-')
 822                         break;
 823                 if (!strcmp(arg, "--advertise-refs")) {
 824                         advertise_refs = 1;
 825                         continue;
 826                 }
 827                 if (!strcmp(arg, "--stateless-rpc")) {
 828                         stateless_rpc = 1;
 829                         continue;
 830                 }
 831                 if (!strcmp(arg, "--strict")) {
 832                         strict = 1;
 833                         continue;
 834                 }
 835                 if (starts_with(arg, "--timeout=")) {
 836                         timeout = atoi(arg+10);
 837                         daemon_mode = 1;
 838                         continue;
 839                 }
 840                 if (!strcmp(arg, "--")) {
 841                         i++;
 842                         break;
 843                 }
 844         }
 845
 846         if (i != argc-1)
 847                 usage(upload_pack_usage);
 848
 849         setup_path();
 850
 851         dir = argv[i];
 852
 853         if (!enter_repo(dir, strict))
 854                 die("'%s' does not appear to be a git repository", dir);
 855
 856         git_config(upload_pack_config, NULL);
 857         upload_pack();
 858         return 0;
 859 }