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

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "pkt-line.h"
   4 #include "sideband.h"
   5 #include "tag.h"
   6 #include "object.h"
   7 #include "commit.h"
   8 #include "exec_cmd.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "list-objects.h"
  12 #include "run-command.h"
  13 #include "connect.h"
  14 #include "sigchain.h"
  15 #include "version.h"
  16 #include "string-list.h"
  17
  18 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  19
  20 /* Remember to update object flag allocation in object.h */
  21 #define THEY_HAVE       (1u << 11)
  22 #define OUR_REF         (1u << 12)
  23 #define WANTED          (1u << 13)
  24 #define COMMON_KNOWN    (1u << 14)
  25 #define REACHABLE       (1u << 15)
  26
  27 #define SHALLOW         (1u << 16)
  28 #define NOT_SHALLOW     (1u << 17)
  29 #define CLIENT_SHALLOW  (1u << 18)
  30 #define HIDDEN_REF      (1u << 19)
  31
  32 static unsigned long oldest_have;
  33
  34 static int multi_ack;
  35 static int no_done;
  36 static int use_thin_pack, use_ofs_delta, use_include_tag;
  37 static int no_progress, daemon_mode;
  38 /* Allow specifying sha1 if it is a ref tip. */
  39 #define ALLOW_TIP_SHA1  01
  40 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  41 #define ALLOW_REACHABLE_SHA1    02
  42 static unsigned int allow_unadvertised_object_request;
  43 static int shallow_nr;
  44 static struct object_array have_obj;
  45 static struct object_array want_obj;
  46 static struct object_array extra_edge_obj;
  47 static unsigned int timeout;
  48 static int keepalive = 5;
  49 /* 0 for no sideband,
  50  * otherwise maximum packet size (up to 65520 bytes).
  51  */
  52 static int use_sideband;
  53 static int advertise_refs;
  54 static int stateless_rpc;
  55
  56 static void reset_timeout(void)
  57 {
  58         alarm(timeout);
  59 }
  60
  61 static void send_client_data(int fd, const char *data, ssize_t sz)
  62 {
  63         if (use_sideband) {
  64                 send_sideband(1, fd, data, sz, use_sideband);
  65                 return;
  66         }
  67         if (fd == 3)
  68                 /* emergency quit */
  69                 fd = 2;
  70         if (fd == 2) {
  71                 /* XXX: are we happy to lose stuff here? */
  72                 xwrite(fd, data, sz);
  73                 return;
  74         }
  75         write_or_die(fd, data, sz);
  76 }
  77
  78 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  79 {
  80         FILE *fp = cb_data;
  81         if (graft->nr_parent == -1)
  82                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  83         return 0;
  84 }
  85
  86 static void create_pack_file(void)
  87 {
  88         struct child_process pack_objects = CHILD_PROCESS_INIT;
  89         char data[8193], progress[128];
  90         char abort_msg[] = "aborting due to possible repository "
  91                 "corruption on the remote side.";
  92         int buffered = -1;
  93         ssize_t sz;
  94         int i;
  95         FILE *pipe_fd;
  96
  97         if (shallow_nr) {
  98                 argv_array_push(&pack_objects.args, "--shallow-file");
  99                 argv_array_push(&pack_objects.args, "");
 100         }
 101         argv_array_push(&pack_objects.args, "pack-objects");
 102         argv_array_push(&pack_objects.args, "--revs");
 103         if (use_thin_pack)
 104                 argv_array_push(&pack_objects.args, "--thin");
 105
 106         argv_array_push(&pack_objects.args, "--stdout");
 107         if (shallow_nr)
 108                 argv_array_push(&pack_objects.args, "--shallow");
 109         if (!no_progress)
 110                 argv_array_push(&pack_objects.args, "--progress");
 111         if (use_ofs_delta)
 112                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 113         if (use_include_tag)
 114                 argv_array_push(&pack_objects.args, "--include-tag");
 115
 116         pack_objects.in = -1;
 117         pack_objects.out = -1;
 118         pack_objects.err = -1;
 119         pack_objects.git_cmd = 1;
 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                         oid_to_hex(&want_obj.objects[i].item->oid));
 132         fprintf(pipe_fd, "--not\n");
 133         for (i = 0; i < have_obj.nr; i++)
 134                 fprintf(pipe_fd, "%s\n",
 135                         oid_to_hex(&have_obj.objects[i].item->oid));
 136         for (i = 0; i < extra_edge_obj.nr; i++)
 137                 fprintf(pipe_fd, "%s\n",
 138                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 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_errno("poll failed, resuming");
 179                                 sleep(1);
 180                         }
 181                         continue;
 182                 }
 183                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 184                         /* Status ready; we ship that in the side-band
 185                          * or dump to the standard error.
 186                          */
 187                         sz = xread(pack_objects.err, progress,
 188                                   sizeof(progress));
 189                         if (0 < sz)
 190                                 send_client_data(2, progress, sz);
 191                         else if (sz == 0) {
 192                                 close(pack_objects.err);
 193                                 pack_objects.err = -1;
 194                         }
 195                         else
 196                                 goto fail;
 197                         /* give priority to status messages */
 198                         continue;
 199                 }
 200                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 201                         /* Data ready; we keep the last byte to ourselves
 202                          * in case we detect broken rev-list, so that we
 203                          * can leave the stream corrupted.  This is
 204                          * unfortunate -- unpack-objects would happily
 205                          * accept a valid packdata with trailing garbage,
 206                          * so appending garbage after we pass all the
 207                          * pack data is not good enough to signal
 208                          * breakage to downstream.
 209                          */
 210                         char *cp = data;
 211                         ssize_t outsz = 0;
 212                         if (0 <= buffered) {
 213                                 *cp++ = buffered;
 214                                 outsz++;
 215                         }
 216                         sz = xread(pack_objects.out, cp,
 217                                   sizeof(data) - outsz);
 218                         if (0 < sz)
 219                                 ;
 220                         else if (sz == 0) {
 221                                 close(pack_objects.out);
 222                                 pack_objects.out = -1;
 223                         }
 224                         else
 225                                 goto fail;
 226                         sz += outsz;
 227                         if (1 < sz) {
 228                                 buffered = data[sz-1] & 0xFF;
 229                                 sz--;
 230                         }
 231                         else
 232                                 buffered = -1;
 233                         send_client_data(1, data, sz);
 234                 }
 235
 236                 /*
 237                  * We hit the keepalive timeout without saying anything; send
 238                  * an empty message on the data sideband just to let the other
 239                  * side know we're still working on it, but don't have any data
 240                  * yet.
 241                  *
 242                  * If we don't have a sideband channel, there's no room in the
 243                  * protocol to say anything, so those clients are just out of
 244                  * luck.
 245                  */
 246                 if (!ret && use_sideband) {
 247                         static const char buf[] = "0005\1";
 248                         write_or_die(1, buf, 5);
 249                 }
 250         }
 251
 252         if (finish_command(&pack_objects)) {
 253                 error("git upload-pack: git-pack-objects died with error.");
 254                 goto fail;
 255         }
 256
 257         /* flush the data */
 258         if (0 <= buffered) {
 259                 data[0] = buffered;
 260                 send_client_data(1, data, 1);
 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;
 313                 struct commit *commit = pop_commit(&work);
 314
 315                 if (commit->object.flags & THEY_HAVE) {
 316                         want->object.flags |= COMMON_KNOWN;
 317                         break;
 318                 }
 319                 if (!commit->object.parsed)
 320                         parse_object(commit->object.oid.hash);
 321                 if (commit->object.flags & REACHABLE)
 322                         continue;
 323                 commit->object.flags |= REACHABLE;
 324                 if (commit->date < oldest_have)
 325                         continue;
 326                 for (list = commit->parents; list; list = list->next) {
 327                         struct commit *parent = list->item;
 328                         if (!(parent->object.flags & REACHABLE))
 329                                 commit_list_insert_by_date(parent, &work);
 330                 }
 331         }
 332         want->object.flags |= REACHABLE;
 333         clear_commit_marks(want, REACHABLE);
 334         free_commit_list(work);
 335         return (want->object.flags & COMMON_KNOWN);
 336 }
 337
 338 static int ok_to_give_up(void)
 339 {
 340         int i;
 341
 342         if (!have_obj.nr)
 343                 return 0;
 344
 345         for (i = 0; i < want_obj.nr; i++) {
 346                 struct object *want = want_obj.objects[i].item;
 347
 348                 if (want->flags & COMMON_KNOWN)
 349                         continue;
 350                 want = deref_tag(want, "a want line", 0);
 351                 if (!want || want->type != OBJ_COMMIT) {
 352                         /* no way to tell if this is reachable by
 353                          * looking at the ancestry chain alone, so
 354                          * leave a note to ourselves not to worry about
 355                          * this object anymore.
 356                          */
 357                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 358                         continue;
 359                 }
 360                 if (!reachable((struct commit *)want))
 361                         return 0;
 362         }
 363         return 1;
 364 }
 365
 366 static int get_common_commits(void)
 367 {
 368         unsigned char sha1[20];
 369         char last_hex[41];
 370         int got_common = 0;
 371         int got_other = 0;
 372         int sent_ready = 0;
 373
 374         save_commit_buffer = 0;
 375
 376         for (;;) {
 377                 char *line = packet_read_line(0, NULL);
 378                 reset_timeout();
 379
 380                 if (!line) {
 381                         if (multi_ack == 2 && got_common
 382                             && !got_other && ok_to_give_up()) {
 383                                 sent_ready = 1;
 384                                 packet_write(1, "ACK %s ready\n", last_hex);
 385                         }
 386                         if (have_obj.nr == 0 || multi_ack)
 387                                 packet_write(1, "NAK\n");
 388
 389                         if (no_done && sent_ready) {
 390                                 packet_write(1, "ACK %s\n", last_hex);
 391                                 return 0;
 392                         }
 393                         if (stateless_rpc)
 394                                 exit(0);
 395                         got_common = 0;
 396                         got_other = 0;
 397                         continue;
 398                 }
 399                 if (starts_with(line, "have ")) {
 400                         switch (got_sha1(line+5, sha1)) {
 401                         case -1: /* they have what we do not */
 402                                 got_other = 1;
 403                                 if (multi_ack && ok_to_give_up()) {
 404                                         const char *hex = sha1_to_hex(sha1);
 405                                         if (multi_ack == 2) {
 406                                                 sent_ready = 1;
 407                                                 packet_write(1, "ACK %s ready\n", hex);
 408                                         } else
 409                                                 packet_write(1, "ACK %s continue\n", hex);
 410                                 }
 411                                 break;
 412                         default:
 413                                 got_common = 1;
 414                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 415                                 if (multi_ack == 2)
 416                                         packet_write(1, "ACK %s common\n", last_hex);
 417                                 else if (multi_ack)
 418                                         packet_write(1, "ACK %s continue\n", last_hex);
 419                                 else if (have_obj.nr == 1)
 420                                         packet_write(1, "ACK %s\n", last_hex);
 421                                 break;
 422                         }
 423                         continue;
 424                 }
 425                 if (!strcmp(line, "done")) {
 426                         if (have_obj.nr > 0) {
 427                                 if (multi_ack)
 428                                         packet_write(1, "ACK %s\n", last_hex);
 429                                 return 0;
 430                         }
 431                         packet_write(1, "NAK\n");
 432                         return -1;
 433                 }
 434                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 435         }
 436 }
 437
 438 static int is_our_ref(struct object *o)
 439 {
 440         int allow_hidden_ref = (allow_unadvertised_object_request &
 441                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 442         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 443 }
 444
 445 static void check_non_tip(void)
 446 {
 447         static const char *argv[] = {
 448                 "rev-list", "--stdin", NULL,
 449         };
 450         static struct child_process cmd = CHILD_PROCESS_INIT;
 451         struct object *o;
 452         char namebuf[42]; /* ^ + SHA-1 + LF */
 453         int i;
 454
 455         /*
 456          * In the normal in-process case without
 457          * uploadpack.allowReachableSHA1InWant,
 458          * non-tip requests can never happen.
 459          */
 460         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 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, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 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, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 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                             oid_to_hex(&o->oid));
 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                                                 oid_to_hex(&object->oid));
 643                                 register_shallow(object->oid.hash);
 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                                         oid_to_hex(&object->oid));
 655                                 object->flags &= ~CLIENT_SHALLOW;
 656                                 /* make sure the real parents are parsed */
 657                                 unregister_shallow(object->oid.hash);
 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->oid.hash);
 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->oid.hash);
 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 char *refname_full,
 685                         const struct object_id *oid)
 686 {
 687         struct object *o = lookup_unknown_object(oid->hash);
 688
 689         if (ref_is_hidden(refname, refname_full)) {
 690                 o->flags |= HIDDEN_REF;
 691                 return 1;
 692         }
 693         o->flags |= OUR_REF;
 694         return 0;
 695 }
 696
 697 static int check_ref(const char *refname_full, const struct object_id *oid,
 698                      int flag, void *cb_data)
 699 {
 700         const char *refname = strip_namespace(refname_full);
 701
 702         mark_our_ref(refname, refname_full, oid);
 703         return 0;
 704 }
 705
 706 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 707 {
 708         struct string_list_item *item;
 709
 710         if (!symref->nr)
 711                 return;
 712         for_each_string_list_item(item, symref)
 713                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 714 }
 715
 716 static int send_ref(const char *refname, const struct object_id *oid,
 717                     int flag, void *cb_data)
 718 {
 719         static const char *capabilities = "multi_ack thin-pack side-band"
 720                 " side-band-64k ofs-delta shallow no-progress"
 721                 " include-tag multi_ack_detailed";
 722         const char *refname_nons = strip_namespace(refname);
 723         struct object_id peeled;
 724
 725         if (mark_our_ref(refname_nons, refname, oid))
 726                 return 0;
 727
 728         if (capabilities) {
 729                 struct strbuf symref_info = STRBUF_INIT;
 730
 731                 format_symref_info(&symref_info, cb_data);
 732                 packet_write(1, "%s %s%c%s%s%s%s%s agent=%s\n",
 733                              oid_to_hex(oid), refname_nons,
 734                              0, capabilities,
 735                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 736                                      " allow-tip-sha1-in-want" : "",
 737                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 738                                      " allow-reachable-sha1-in-want" : "",
 739                              stateless_rpc ? " no-done" : "",
 740                              symref_info.buf,
 741                              git_user_agent_sanitized());
 742                 strbuf_release(&symref_info);
 743         } else {
 744                 packet_write(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 745         }
 746         capabilities = NULL;
 747         if (!peel_ref(refname, peeled.hash))
 748                 packet_write(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 749         return 0;
 750 }
 751
 752 static int find_symref(const char *refname, const struct object_id *oid,
 753                        int flag, void *cb_data)
 754 {
 755         const char *symref_target;
 756         struct string_list_item *item;
 757         struct object_id unused;
 758
 759         if ((flag & REF_ISSYMREF) == 0)
 760                 return 0;
 761         symref_target = resolve_ref_unsafe(refname, 0, unused.hash, &flag);
 762         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 763                 die("'%s' is a symref but it is not?", refname);
 764         item = string_list_append(cb_data, refname);
 765         item->util = xstrdup(symref_target);
 766         return 0;
 767 }
 768
 769 static void upload_pack(void)
 770 {
 771         struct string_list symref = STRING_LIST_INIT_DUP;
 772
 773         head_ref_namespaced(find_symref, &symref);
 774
 775         if (advertise_refs || !stateless_rpc) {
 776                 reset_timeout();
 777                 head_ref_namespaced(send_ref, &symref);
 778                 for_each_namespaced_ref(send_ref, &symref);
 779                 advertise_shallow_grafts(1);
 780                 packet_flush(1);
 781         } else {
 782                 head_ref_namespaced(check_ref, NULL);
 783                 for_each_namespaced_ref(check_ref, NULL);
 784         }
 785         string_list_clear(&symref, 1);
 786         if (advertise_refs)
 787                 return;
 788
 789         receive_needs();
 790         if (want_obj.nr) {
 791                 get_common_commits();
 792                 create_pack_file();
 793         }
 794 }
 795
 796 static int upload_pack_config(const char *var, const char *value, void *unused)
 797 {
 798         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
 799                 if (git_config_bool(var, value))
 800                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
 801                 else
 802                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
 803         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
 804                 if (git_config_bool(var, value))
 805                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
 806                 else
 807                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
 808         } else if (!strcmp("uploadpack.keepalive", var)) {
 809                 keepalive = git_config_int(var, value);
 810                 if (!keepalive)
 811                         keepalive = -1;
 812         }
 813         return parse_hide_refs_config(var, value, "uploadpack");
 814 }
 815
 816 int cmd_main(int argc, const char **argv)
 817 {
 818         const char *dir;
 819         int i;
 820         int strict = 0;
 821
 822         packet_trace_identity("upload-pack");
 823         check_replace_refs = 0;
 824
 825         for (i = 1; i < argc; i++) {
 826                 const char *arg = argv[i];
 827
 828                 if (arg[0] != '-')
 829                         break;
 830                 if (!strcmp(arg, "--advertise-refs")) {
 831                         advertise_refs = 1;
 832                         continue;
 833                 }
 834                 if (!strcmp(arg, "--stateless-rpc")) {
 835                         stateless_rpc = 1;
 836                         continue;
 837                 }
 838                 if (!strcmp(arg, "--strict")) {
 839                         strict = 1;
 840                         continue;
 841                 }
 842                 if (starts_with(arg, "--timeout=")) {
 843                         timeout = atoi(arg+10);
 844                         daemon_mode = 1;
 845                         continue;
 846                 }
 847                 if (!strcmp(arg, "--")) {
 848                         i++;
 849                         break;
 850                 }
 851         }
 852
 853         if (i != argc-1)
 854                 usage(upload_pack_usage);
 855
 856         setup_path();
 857
 858         dir = argv[i];
 859
 860         if (!enter_repo(dir, strict))
 861                 die("'%s' does not appear to be a git repository", dir);
 862
 863         git_config(upload_pack_config, NULL);
 864         upload_pack();
 865         return 0;
 866 }