upload-pack.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "repository.h"
   7 #include "object-store.h"
   8 #include "tag.h"
   9 #include "object.h"
  10 #include "commit.h"
  11 #include "diff.h"
  12 #include "revision.h"
  13 #include "list-objects.h"
  14 #include "list-objects-filter.h"
  15 #include "list-objects-filter-options.h"
  16 #include "run-command.h"
  17 #include "connect.h"
  18 #include "sigchain.h"
  19 #include "version.h"
  20 #include "string-list.h"
  21 #include "argv-array.h"
  22 #include "prio-queue.h"
  23 #include "protocol.h"
  24 #include "quote.h"
  25 #include "upload-pack.h"
  26 #include "serve.h"
  27 #include "commit-reach.h"
  28
  29 /* Remember to update object flag allocation in object.h */
  30 #define THEY_HAVE       (1u << 11)
  31 #define OUR_REF         (1u << 12)
  32 #define WANTED          (1u << 13)
  33 #define COMMON_KNOWN    (1u << 14)
  34
  35 #define SHALLOW         (1u << 16)
  36 #define NOT_SHALLOW     (1u << 17)
  37 #define CLIENT_SHALLOW  (1u << 18)
  38 #define HIDDEN_REF      (1u << 19)
  39
  40 static timestamp_t oldest_have;
  41
  42 static int deepen_relative;
  43 static int multi_ack;
  44 static int no_done;
  45 static int use_thin_pack, use_ofs_delta, use_include_tag;
  46 static int no_progress, daemon_mode;
  47 /* Allow specifying sha1 if it is a ref tip. */
  48 #define ALLOW_TIP_SHA1  01
  49 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  50 #define ALLOW_REACHABLE_SHA1    02
  51 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  52 #define ALLOW_ANY_SHA1  07
  53 static unsigned int allow_unadvertised_object_request;
  54 static int shallow_nr;
  55 static struct object_array have_obj;
  56 static struct object_array want_obj;
  57 static struct object_array extra_edge_obj;
  58 static unsigned int timeout;
  59 static int keepalive = 5;
  60 /* 0 for no sideband,
  61  * otherwise maximum packet size (up to 65520 bytes).
  62  */
  63 static int use_sideband;
  64 static int stateless_rpc;
  65 static const char *pack_objects_hook;
  66
  67 static int filter_capability_requested;
  68 static int allow_filter;
  69 static struct list_objects_filter_options filter_options;
  70
  71 static void reset_timeout(void)
  72 {
  73         alarm(timeout);
  74 }
  75
  76 static void send_client_data(int fd, const char *data, ssize_t sz)
  77 {
  78         if (use_sideband) {
  79                 send_sideband(1, fd, data, sz, use_sideband);
  80                 return;
  81         }
  82         if (fd == 3)
  83                 /* emergency quit */
  84                 fd = 2;
  85         if (fd == 2) {
  86                 /* XXX: are we happy to lose stuff here? */
  87                 xwrite(fd, data, sz);
  88                 return;
  89         }
  90         write_or_die(fd, data, sz);
  91 }
  92
  93 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  94 {
  95         FILE *fp = cb_data;
  96         if (graft->nr_parent == -1)
  97                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  98         return 0;
  99 }
 100
 101 static void create_pack_file(void)
 102 {
 103         struct child_process pack_objects = CHILD_PROCESS_INIT;
 104         char data[8193], progress[128];
 105         char abort_msg[] = "aborting due to possible repository "
 106                 "corruption on the remote side.";
 107         int buffered = -1;
 108         ssize_t sz;
 109         int i;
 110         FILE *pipe_fd;
 111
 112         if (!pack_objects_hook)
 113                 pack_objects.git_cmd = 1;
 114         else {
 115                 argv_array_push(&pack_objects.args, pack_objects_hook);
 116                 argv_array_push(&pack_objects.args, "git");
 117                 pack_objects.use_shell = 1;
 118         }
 119
 120         if (shallow_nr) {
 121                 argv_array_push(&pack_objects.args, "--shallow-file");
 122                 argv_array_push(&pack_objects.args, "");
 123         }
 124         argv_array_push(&pack_objects.args, "pack-objects");
 125         argv_array_push(&pack_objects.args, "--revs");
 126         if (use_thin_pack)
 127                 argv_array_push(&pack_objects.args, "--thin");
 128
 129         argv_array_push(&pack_objects.args, "--stdout");
 130         if (shallow_nr)
 131                 argv_array_push(&pack_objects.args, "--shallow");
 132         if (!no_progress)
 133                 argv_array_push(&pack_objects.args, "--progress");
 134         if (use_ofs_delta)
 135                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 136         if (use_include_tag)
 137                 argv_array_push(&pack_objects.args, "--include-tag");
 138         if (filter_options.filter_spec) {
 139                 if (pack_objects.use_shell) {
 140                         struct strbuf buf = STRBUF_INIT;
 141                         sq_quote_buf(&buf, filter_options.filter_spec);
 142                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 143                         strbuf_release(&buf);
 144                 } else {
 145                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 146                                          filter_options.filter_spec);
 147                 }
 148         }
 149
 150         pack_objects.in = -1;
 151         pack_objects.out = -1;
 152         pack_objects.err = -1;
 153
 154         if (start_command(&pack_objects))
 155                 die("git upload-pack: unable to fork git-pack-objects");
 156
 157         pipe_fd = xfdopen(pack_objects.in, "w");
 158
 159         if (shallow_nr)
 160                 for_each_commit_graft(write_one_shallow, pipe_fd);
 161
 162         for (i = 0; i < want_obj.nr; i++)
 163                 fprintf(pipe_fd, "%s\n",
 164                         oid_to_hex(&want_obj.objects[i].item->oid));
 165         fprintf(pipe_fd, "--not\n");
 166         for (i = 0; i < have_obj.nr; i++)
 167                 fprintf(pipe_fd, "%s\n",
 168                         oid_to_hex(&have_obj.objects[i].item->oid));
 169         for (i = 0; i < extra_edge_obj.nr; i++)
 170                 fprintf(pipe_fd, "%s\n",
 171                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 172         fprintf(pipe_fd, "\n");
 173         fflush(pipe_fd);
 174         fclose(pipe_fd);
 175
 176         /* We read from pack_objects.err to capture stderr output for
 177          * progress bar, and pack_objects.out to capture the pack data.
 178          */
 179
 180         while (1) {
 181                 struct pollfd pfd[2];
 182                 int pe, pu, pollsize;
 183                 int ret;
 184
 185                 reset_timeout();
 186
 187                 pollsize = 0;
 188                 pe = pu = -1;
 189
 190                 if (0 <= pack_objects.out) {
 191                         pfd[pollsize].fd = pack_objects.out;
 192                         pfd[pollsize].events = POLLIN;
 193                         pu = pollsize;
 194                         pollsize++;
 195                 }
 196                 if (0 <= pack_objects.err) {
 197                         pfd[pollsize].fd = pack_objects.err;
 198                         pfd[pollsize].events = POLLIN;
 199                         pe = pollsize;
 200                         pollsize++;
 201                 }
 202
 203                 if (!pollsize)
 204                         break;
 205
 206                 ret = poll(pfd, pollsize,
 207                         keepalive < 0 ? -1 : 1000 * keepalive);
 208
 209                 if (ret < 0) {
 210                         if (errno != EINTR) {
 211                                 error_errno("poll failed, resuming");
 212                                 sleep(1);
 213                         }
 214                         continue;
 215                 }
 216                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 217                         /* Status ready; we ship that in the side-band
 218                          * or dump to the standard error.
 219                          */
 220                         sz = xread(pack_objects.err, progress,
 221                                   sizeof(progress));
 222                         if (0 < sz)
 223                                 send_client_data(2, progress, sz);
 224                         else if (sz == 0) {
 225                                 close(pack_objects.err);
 226                                 pack_objects.err = -1;
 227                         }
 228                         else
 229                                 goto fail;
 230                         /* give priority to status messages */
 231                         continue;
 232                 }
 233                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 234                         /* Data ready; we keep the last byte to ourselves
 235                          * in case we detect broken rev-list, so that we
 236                          * can leave the stream corrupted.  This is
 237                          * unfortunate -- unpack-objects would happily
 238                          * accept a valid packdata with trailing garbage,
 239                          * so appending garbage after we pass all the
 240                          * pack data is not good enough to signal
 241                          * breakage to downstream.
 242                          */
 243                         char *cp = data;
 244                         ssize_t outsz = 0;
 245                         if (0 <= buffered) {
 246                                 *cp++ = buffered;
 247                                 outsz++;
 248                         }
 249                         sz = xread(pack_objects.out, cp,
 250                                   sizeof(data) - outsz);
 251                         if (0 < sz)
 252                                 ;
 253                         else if (sz == 0) {
 254                                 close(pack_objects.out);
 255                                 pack_objects.out = -1;
 256                         }
 257                         else
 258                                 goto fail;
 259                         sz += outsz;
 260                         if (1 < sz) {
 261                                 buffered = data[sz-1] & 0xFF;
 262                                 sz--;
 263                         }
 264                         else
 265                                 buffered = -1;
 266                         send_client_data(1, data, sz);
 267                 }
 268
 269                 /*
 270                  * We hit the keepalive timeout without saying anything; send
 271                  * an empty message on the data sideband just to let the other
 272                  * side know we're still working on it, but don't have any data
 273                  * yet.
 274                  *
 275                  * If we don't have a sideband channel, there's no room in the
 276                  * protocol to say anything, so those clients are just out of
 277                  * luck.
 278                  */
 279                 if (!ret && use_sideband) {
 280                         static const char buf[] = "0005\1";
 281                         write_or_die(1, buf, 5);
 282                 }
 283         }
 284
 285         if (finish_command(&pack_objects)) {
 286                 error("git upload-pack: git-pack-objects died with error.");
 287                 goto fail;
 288         }
 289
 290         /* flush the data */
 291         if (0 <= buffered) {
 292                 data[0] = buffered;
 293                 send_client_data(1, data, 1);
 294                 fprintf(stderr, "flushed.\n");
 295         }
 296         if (use_sideband)
 297                 packet_flush(1);
 298         return;
 299
 300  fail:
 301         send_client_data(3, abort_msg, sizeof(abort_msg));
 302         die("git upload-pack: %s", abort_msg);
 303 }
 304
 305 static int got_oid(const char *hex, struct object_id *oid)
 306 {
 307         struct object *o;
 308         int we_knew_they_have = 0;
 309
 310         if (get_oid_hex(hex, oid))
 311                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 312         if (!has_object_file(oid))
 313                 return -1;
 314
 315         o = parse_object(the_repository, oid);
 316         if (!o)
 317                 die("oops (%s)", oid_to_hex(oid));
 318         if (o->type == OBJ_COMMIT) {
 319                 struct commit_list *parents;
 320                 struct commit *commit = (struct commit *)o;
 321                 if (o->flags & THEY_HAVE)
 322                         we_knew_they_have = 1;
 323                 else
 324                         o->flags |= THEY_HAVE;
 325                 if (!oldest_have || (commit->date < oldest_have))
 326                         oldest_have = commit->date;
 327                 for (parents = commit->parents;
 328                      parents;
 329                      parents = parents->next)
 330                         parents->item->object.flags |= THEY_HAVE;
 331         }
 332         if (!we_knew_they_have) {
 333                 add_object_array(o, NULL, &have_obj);
 334                 return 1;
 335         }
 336         return 0;
 337 }
 338
 339 static int ok_to_give_up(void)
 340 {
 341         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 342
 343         if (!have_obj.nr)
 344                 return 0;
 345
 346         return can_all_from_reach_with_flag(&want_obj, THEY_HAVE,
 347                                             COMMON_KNOWN, oldest_have,
 348                                             min_generation);
 349 }
 350
 351 static int get_common_commits(void)
 352 {
 353         struct object_id oid;
 354         char last_hex[GIT_MAX_HEXSZ + 1];
 355         int got_common = 0;
 356         int got_other = 0;
 357         int sent_ready = 0;
 358
 359         save_commit_buffer = 0;
 360
 361         for (;;) {
 362                 char *line = packet_read_line(0, NULL);
 363                 const char *arg;
 364
 365                 reset_timeout();
 366
 367                 if (!line) {
 368                         if (multi_ack == 2 && got_common
 369                             && !got_other && ok_to_give_up()) {
 370                                 sent_ready = 1;
 371                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 372                         }
 373                         if (have_obj.nr == 0 || multi_ack)
 374                                 packet_write_fmt(1, "NAK\n");
 375
 376                         if (no_done && sent_ready) {
 377                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 378                                 return 0;
 379                         }
 380                         if (stateless_rpc)
 381                                 exit(0);
 382                         got_common = 0;
 383                         got_other = 0;
 384                         continue;
 385                 }
 386                 if (skip_prefix(line, "have ", &arg)) {
 387                         switch (got_oid(arg, &oid)) {
 388                         case -1: /* they have what we do not */
 389                                 got_other = 1;
 390                                 if (multi_ack && ok_to_give_up()) {
 391                                         const char *hex = oid_to_hex(&oid);
 392                                         if (multi_ack == 2) {
 393                                                 sent_ready = 1;
 394                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 395                                         } else
 396                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 397                                 }
 398                                 break;
 399                         default:
 400                                 got_common = 1;
 401                                 oid_to_hex_r(last_hex, &oid);
 402                                 if (multi_ack == 2)
 403                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 404                                 else if (multi_ack)
 405                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 406                                 else if (have_obj.nr == 1)
 407                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 408                                 break;
 409                         }
 410                         continue;
 411                 }
 412                 if (!strcmp(line, "done")) {
 413                         if (have_obj.nr > 0) {
 414                                 if (multi_ack)
 415                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 416                                 return 0;
 417                         }
 418                         packet_write_fmt(1, "NAK\n");
 419                         return -1;
 420                 }
 421                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 422         }
 423 }
 424
 425 static int is_our_ref(struct object *o)
 426 {
 427         int allow_hidden_ref = (allow_unadvertised_object_request &
 428                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 429         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 430 }
 431
 432 /*
 433  * on successful case, it's up to the caller to close cmd->out
 434  */
 435 static int do_reachable_revlist(struct child_process *cmd,
 436                                 struct object_array *src,
 437                                 struct object_array *reachable)
 438 {
 439         static const char *argv[] = {
 440                 "rev-list", "--stdin", NULL,
 441         };
 442         struct object *o;
 443         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 444         int i;
 445
 446         cmd->argv = argv;
 447         cmd->git_cmd = 1;
 448         cmd->no_stderr = 1;
 449         cmd->in = -1;
 450         cmd->out = -1;
 451
 452         /*
 453          * If the next rev-list --stdin encounters an unknown commit,
 454          * it terminates, which will cause SIGPIPE in the write loop
 455          * below.
 456          */
 457         sigchain_push(SIGPIPE, SIG_IGN);
 458
 459         if (start_command(cmd))
 460                 goto error;
 461
 462         namebuf[0] = '^';
 463         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 464         for (i = get_max_object_index(); 0 < i; ) {
 465                 o = get_indexed_object(--i);
 466                 if (!o)
 467                         continue;
 468                 if (reachable && o->type == OBJ_COMMIT)
 469                         o->flags &= ~TMP_MARK;
 470                 if (!is_our_ref(o))
 471                         continue;
 472                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 473                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 474                         goto error;
 475         }
 476         namebuf[GIT_SHA1_HEXSZ] = '\n';
 477         for (i = 0; i < src->nr; i++) {
 478                 o = src->objects[i].item;
 479                 if (is_our_ref(o)) {
 480                         if (reachable)
 481                                 add_object_array(o, NULL, reachable);
 482                         continue;
 483                 }
 484                 if (reachable && o->type == OBJ_COMMIT)
 485                         o->flags |= TMP_MARK;
 486                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 487                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 488                         goto error;
 489         }
 490         close(cmd->in);
 491         cmd->in = -1;
 492         sigchain_pop(SIGPIPE);
 493
 494         return 0;
 495
 496 error:
 497         sigchain_pop(SIGPIPE);
 498
 499         if (cmd->in >= 0)
 500                 close(cmd->in);
 501         if (cmd->out >= 0)
 502                 close(cmd->out);
 503         return -1;
 504 }
 505
 506 static int get_reachable_list(struct object_array *src,
 507                               struct object_array *reachable)
 508 {
 509         struct child_process cmd = CHILD_PROCESS_INIT;
 510         int i;
 511         struct object *o;
 512         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 513         const unsigned hexsz = the_hash_algo->hexsz;
 514
 515         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 516                 return -1;
 517
 518         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 519                 struct object_id sha1;
 520                 const char *p;
 521
 522                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 523                         break;
 524
 525                 o = lookup_object(the_repository, sha1.hash);
 526                 if (o && o->type == OBJ_COMMIT) {
 527                         o->flags &= ~TMP_MARK;
 528                 }
 529         }
 530         for (i = get_max_object_index(); 0 < i; i--) {
 531                 o = get_indexed_object(i - 1);
 532                 if (o && o->type == OBJ_COMMIT &&
 533                     (o->flags & TMP_MARK)) {
 534                         add_object_array(o, NULL, reachable);
 535                                 o->flags &= ~TMP_MARK;
 536                 }
 537         }
 538         close(cmd.out);
 539
 540         if (finish_command(&cmd))
 541                 return -1;
 542
 543         return 0;
 544 }
 545
 546 static int has_unreachable(struct object_array *src)
 547 {
 548         struct child_process cmd = CHILD_PROCESS_INIT;
 549         char buf[1];
 550         int i;
 551
 552         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 553                 return 1;
 554
 555         /*
 556          * The commits out of the rev-list are not ancestors of
 557          * our ref.
 558          */
 559         i = read_in_full(cmd.out, buf, 1);
 560         if (i)
 561                 goto error;
 562         close(cmd.out);
 563         cmd.out = -1;
 564
 565         /*
 566          * rev-list may have died by encountering a bad commit
 567          * in the history, in which case we do want to bail out
 568          * even when it showed no commit.
 569          */
 570         if (finish_command(&cmd))
 571                 goto error;
 572
 573         /* All the non-tip ones are ancestors of what we advertised */
 574         return 0;
 575
 576 error:
 577         sigchain_pop(SIGPIPE);
 578         if (cmd.out >= 0)
 579                 close(cmd.out);
 580         return 1;
 581 }
 582
 583 static void check_non_tip(void)
 584 {
 585         int i;
 586
 587         /*
 588          * In the normal in-process case without
 589          * uploadpack.allowReachableSHA1InWant,
 590          * non-tip requests can never happen.
 591          */
 592         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 593                 goto error;
 594         if (!has_unreachable(&want_obj))
 595                 /* All the non-tip ones are ancestors of what we advertised */
 596                 return;
 597
 598 error:
 599         /* Pick one of them (we know there at least is one) */
 600         for (i = 0; i < want_obj.nr; i++) {
 601                 struct object *o = want_obj.objects[i].item;
 602                 if (!is_our_ref(o))
 603                         die("git upload-pack: not our ref %s",
 604                             oid_to_hex(&o->oid));
 605         }
 606 }
 607
 608 static void send_shallow(struct commit_list *result)
 609 {
 610         while (result) {
 611                 struct object *object = &result->item->object;
 612                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 613                         packet_write_fmt(1, "shallow %s",
 614                                          oid_to_hex(&object->oid));
 615                         register_shallow(the_repository, &object->oid);
 616                         shallow_nr++;
 617                 }
 618                 result = result->next;
 619         }
 620 }
 621
 622 static void send_unshallow(const struct object_array *shallows)
 623 {
 624         int i;
 625
 626         for (i = 0; i < shallows->nr; i++) {
 627                 struct object *object = shallows->objects[i].item;
 628                 if (object->flags & NOT_SHALLOW) {
 629                         struct commit_list *parents;
 630                         packet_write_fmt(1, "unshallow %s",
 631                                          oid_to_hex(&object->oid));
 632                         object->flags &= ~CLIENT_SHALLOW;
 633                         /*
 634                          * We want to _register_ "object" as shallow, but we
 635                          * also need to traverse object's parents to deepen a
 636                          * shallow clone. Unregister it for now so we can
 637                          * parse and add the parents to the want list, then
 638                          * re-register it.
 639                          */
 640                         unregister_shallow(&object->oid);
 641                         object->parsed = 0;
 642                         parse_commit_or_die((struct commit *)object);
 643                         parents = ((struct commit *)object)->parents;
 644                         while (parents) {
 645                                 add_object_array(&parents->item->object,
 646                                                  NULL, &want_obj);
 647                                 parents = parents->next;
 648                         }
 649                         add_object_array(object, NULL, &extra_edge_obj);
 650                 }
 651                 /* make sure commit traversal conforms to client */
 652                 register_shallow(the_repository, &object->oid);
 653         }
 654 }
 655
 656 static void deepen(int depth, int deepen_relative,
 657                    struct object_array *shallows)
 658 {
 659         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 660                 int i;
 661
 662                 for (i = 0; i < shallows->nr; i++) {
 663                         struct object *object = shallows->objects[i].item;
 664                         object->flags |= NOT_SHALLOW;
 665                 }
 666         } else if (deepen_relative) {
 667                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 668                 struct commit_list *result;
 669
 670                 get_reachable_list(shallows, &reachable_shallows);
 671                 result = get_shallow_commits(&reachable_shallows,
 672                                              depth + 1,
 673                                              SHALLOW, NOT_SHALLOW);
 674                 send_shallow(result);
 675                 free_commit_list(result);
 676                 object_array_clear(&reachable_shallows);
 677         } else {
 678                 struct commit_list *result;
 679
 680                 result = get_shallow_commits(&want_obj, depth,
 681                                              SHALLOW, NOT_SHALLOW);
 682                 send_shallow(result);
 683                 free_commit_list(result);
 684         }
 685
 686         send_unshallow(shallows);
 687 }
 688
 689 static void deepen_by_rev_list(int ac, const char **av,
 690                                struct object_array *shallows)
 691 {
 692         struct commit_list *result;
 693
 694         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 695         send_shallow(result);
 696         free_commit_list(result);
 697         send_unshallow(shallows);
 698 }
 699
 700 /* Returns 1 if a shallow list is sent or 0 otherwise */
 701 static int send_shallow_list(int depth, int deepen_rev_list,
 702                              timestamp_t deepen_since,
 703                              struct string_list *deepen_not,
 704                              struct object_array *shallows)
 705 {
 706         int ret = 0;
 707
 708         if (depth > 0 && deepen_rev_list)
 709                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 710         if (depth > 0) {
 711                 deepen(depth, deepen_relative, shallows);
 712                 ret = 1;
 713         } else if (deepen_rev_list) {
 714                 struct argv_array av = ARGV_ARRAY_INIT;
 715                 int i;
 716
 717                 argv_array_push(&av, "rev-list");
 718                 if (deepen_since)
 719                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 720                 if (deepen_not->nr) {
 721                         argv_array_push(&av, "--not");
 722                         for (i = 0; i < deepen_not->nr; i++) {
 723                                 struct string_list_item *s = deepen_not->items + i;
 724                                 argv_array_push(&av, s->string);
 725                         }
 726                         argv_array_push(&av, "--not");
 727                 }
 728                 for (i = 0; i < want_obj.nr; i++) {
 729                         struct object *o = want_obj.objects[i].item;
 730                         argv_array_push(&av, oid_to_hex(&o->oid));
 731                 }
 732                 deepen_by_rev_list(av.argc, av.argv, shallows);
 733                 argv_array_clear(&av);
 734                 ret = 1;
 735         } else {
 736                 if (shallows->nr > 0) {
 737                         int i;
 738                         for (i = 0; i < shallows->nr; i++)
 739                                 register_shallow(the_repository,
 740                                                  &shallows->objects[i].item->oid);
 741                 }
 742         }
 743
 744         shallow_nr += shallows->nr;
 745         return ret;
 746 }
 747
 748 static int process_shallow(const char *line, struct object_array *shallows)
 749 {
 750         const char *arg;
 751         if (skip_prefix(line, "shallow ", &arg)) {
 752                 struct object_id oid;
 753                 struct object *object;
 754                 if (get_oid_hex(arg, &oid))
 755                         die("invalid shallow line: %s", line);
 756                 object = parse_object(the_repository, &oid);
 757                 if (!object)
 758                         return 1;
 759                 if (object->type != OBJ_COMMIT)
 760                         die("invalid shallow object %s", oid_to_hex(&oid));
 761                 if (!(object->flags & CLIENT_SHALLOW)) {
 762                         object->flags |= CLIENT_SHALLOW;
 763                         add_object_array(object, NULL, shallows);
 764                 }
 765                 return 1;
 766         }
 767
 768         return 0;
 769 }
 770
 771 static int process_deepen(const char *line, int *depth)
 772 {
 773         const char *arg;
 774         if (skip_prefix(line, "deepen ", &arg)) {
 775                 char *end = NULL;
 776                 *depth = (int)strtol(arg, &end, 0);
 777                 if (!end || *end || *depth <= 0)
 778                         die("Invalid deepen: %s", line);
 779                 return 1;
 780         }
 781
 782         return 0;
 783 }
 784
 785 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 786 {
 787         const char *arg;
 788         if (skip_prefix(line, "deepen-since ", &arg)) {
 789                 char *end = NULL;
 790                 *deepen_since = parse_timestamp(arg, &end, 0);
 791                 if (!end || *end || !deepen_since ||
 792                     /* revisions.c's max_age -1 is special */
 793                     *deepen_since == -1)
 794                         die("Invalid deepen-since: %s", line);
 795                 *deepen_rev_list = 1;
 796                 return 1;
 797         }
 798         return 0;
 799 }
 800
 801 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 802 {
 803         const char *arg;
 804         if (skip_prefix(line, "deepen-not ", &arg)) {
 805                 char *ref = NULL;
 806                 struct object_id oid;
 807                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 808                         die("git upload-pack: ambiguous deepen-not: %s", line);
 809                 string_list_append(deepen_not, ref);
 810                 free(ref);
 811                 *deepen_rev_list = 1;
 812                 return 1;
 813         }
 814         return 0;
 815 }
 816
 817 static void receive_needs(void)
 818 {
 819         struct object_array shallows = OBJECT_ARRAY_INIT;
 820         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 821         int depth = 0;
 822         int has_non_tip = 0;
 823         timestamp_t deepen_since = 0;
 824         int deepen_rev_list = 0;
 825
 826         shallow_nr = 0;
 827         for (;;) {
 828                 struct object *o;
 829                 const char *features;
 830                 struct object_id oid_buf;
 831                 char *line = packet_read_line(0, NULL);
 832                 const char *arg;
 833
 834                 reset_timeout();
 835                 if (!line)
 836                         break;
 837
 838                 if (process_shallow(line, &shallows))
 839                         continue;
 840                 if (process_deepen(line, &depth))
 841                         continue;
 842                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 843                         continue;
 844                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 845                         continue;
 846
 847                 if (skip_prefix(line, "filter ", &arg)) {
 848                         if (!filter_capability_requested)
 849                                 die("git upload-pack: filtering capability not negotiated");
 850                         parse_list_objects_filter(&filter_options, arg);
 851                         continue;
 852                 }
 853
 854                 if (!skip_prefix(line, "want ", &arg) ||
 855                     parse_oid_hex(arg, &oid_buf, &features))
 856                         die("git upload-pack: protocol error, "
 857                             "expected to get object ID, not '%s'", line);
 858
 859                 if (parse_feature_request(features, "deepen-relative"))
 860                         deepen_relative = 1;
 861                 if (parse_feature_request(features, "multi_ack_detailed"))
 862                         multi_ack = 2;
 863                 else if (parse_feature_request(features, "multi_ack"))
 864                         multi_ack = 1;
 865                 if (parse_feature_request(features, "no-done"))
 866                         no_done = 1;
 867                 if (parse_feature_request(features, "thin-pack"))
 868                         use_thin_pack = 1;
 869                 if (parse_feature_request(features, "ofs-delta"))
 870                         use_ofs_delta = 1;
 871                 if (parse_feature_request(features, "side-band-64k"))
 872                         use_sideband = LARGE_PACKET_MAX;
 873                 else if (parse_feature_request(features, "side-band"))
 874                         use_sideband = DEFAULT_PACKET_MAX;
 875                 if (parse_feature_request(features, "no-progress"))
 876                         no_progress = 1;
 877                 if (parse_feature_request(features, "include-tag"))
 878                         use_include_tag = 1;
 879                 if (allow_filter && parse_feature_request(features, "filter"))
 880                         filter_capability_requested = 1;
 881
 882                 o = parse_object(the_repository, &oid_buf);
 883                 if (!o) {
 884                         packet_write_fmt(1,
 885                                          "ERR upload-pack: not our ref %s",
 886                                          oid_to_hex(&oid_buf));
 887                         die("git upload-pack: not our ref %s",
 888                             oid_to_hex(&oid_buf));
 889                 }
 890                 if (!(o->flags & WANTED)) {
 891                         o->flags |= WANTED;
 892                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 893                               || is_our_ref(o)))
 894                                 has_non_tip = 1;
 895                         add_object_array(o, NULL, &want_obj);
 896                 }
 897         }
 898
 899         /*
 900          * We have sent all our refs already, and the other end
 901          * should have chosen out of them. When we are operating
 902          * in the stateless RPC mode, however, their choice may
 903          * have been based on the set of older refs advertised
 904          * by another process that handled the initial request.
 905          */
 906         if (has_non_tip)
 907                 check_non_tip();
 908
 909         if (!use_sideband && daemon_mode)
 910                 no_progress = 1;
 911
 912         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 913                 return;
 914
 915         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 916                               &deepen_not, &shallows))
 917                 packet_flush(1);
 918         object_array_clear(&shallows);
 919 }
 920
 921 /* return non-zero if the ref is hidden, otherwise 0 */
 922 static int mark_our_ref(const char *refname, const char *refname_full,
 923                         const struct object_id *oid)
 924 {
 925         struct object *o = lookup_unknown_object(oid->hash);
 926
 927         if (ref_is_hidden(refname, refname_full)) {
 928                 o->flags |= HIDDEN_REF;
 929                 return 1;
 930         }
 931         o->flags |= OUR_REF;
 932         return 0;
 933 }
 934
 935 static int check_ref(const char *refname_full, const struct object_id *oid,
 936                      int flag, void *cb_data)
 937 {
 938         const char *refname = strip_namespace(refname_full);
 939
 940         mark_our_ref(refname, refname_full, oid);
 941         return 0;
 942 }
 943
 944 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 945 {
 946         struct string_list_item *item;
 947
 948         if (!symref->nr)
 949                 return;
 950         for_each_string_list_item(item, symref)
 951                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 952 }
 953
 954 static int send_ref(const char *refname, const struct object_id *oid,
 955                     int flag, void *cb_data)
 956 {
 957         static const char *capabilities = "multi_ack thin-pack side-band"
 958                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 959                 " deepen-relative no-progress include-tag multi_ack_detailed";
 960         const char *refname_nons = strip_namespace(refname);
 961         struct object_id peeled;
 962
 963         if (mark_our_ref(refname_nons, refname, oid))
 964                 return 0;
 965
 966         if (capabilities) {
 967                 struct strbuf symref_info = STRBUF_INIT;
 968
 969                 format_symref_info(&symref_info, cb_data);
 970                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
 971                              oid_to_hex(oid), refname_nons,
 972                              0, capabilities,
 973                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 974                                      " allow-tip-sha1-in-want" : "",
 975                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 976                                      " allow-reachable-sha1-in-want" : "",
 977                              stateless_rpc ? " no-done" : "",
 978                              symref_info.buf,
 979                              allow_filter ? " filter" : "",
 980                              git_user_agent_sanitized());
 981                 strbuf_release(&symref_info);
 982         } else {
 983                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 984         }
 985         capabilities = NULL;
 986         if (!peel_ref(refname, &peeled))
 987                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 988         return 0;
 989 }
 990
 991 static int find_symref(const char *refname, const struct object_id *oid,
 992                        int flag, void *cb_data)
 993 {
 994         const char *symref_target;
 995         struct string_list_item *item;
 996
 997         if ((flag & REF_ISSYMREF) == 0)
 998                 return 0;
 999         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1000         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1001                 die("'%s' is a symref but it is not?", refname);
1002         item = string_list_append(cb_data, refname);
1003         item->util = xstrdup(symref_target);
1004         return 0;
1005 }
1006
1007 static int upload_pack_config(const char *var, const char *value, void *unused)
1008 {
1009         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1010                 if (git_config_bool(var, value))
1011                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1012                 else
1013                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1014         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1015                 if (git_config_bool(var, value))
1016                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1017                 else
1018                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1019         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1020                 if (git_config_bool(var, value))
1021                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1022                 else
1023                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1024         } else if (!strcmp("uploadpack.keepalive", var)) {
1025                 keepalive = git_config_int(var, value);
1026                 if (!keepalive)
1027                         keepalive = -1;
1028         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1029                 if (!strcmp("uploadpack.packobjectshook", var))
1030                         return git_config_string(&pack_objects_hook, var, value);
1031         } else if (!strcmp("uploadpack.allowfilter", var)) {
1032                 allow_filter = git_config_bool(var, value);
1033         }
1034         return parse_hide_refs_config(var, value, "uploadpack");
1035 }
1036
1037 void upload_pack(struct upload_pack_options *options)
1038 {
1039         struct string_list symref = STRING_LIST_INIT_DUP;
1040
1041         stateless_rpc = options->stateless_rpc;
1042         timeout = options->timeout;
1043         daemon_mode = options->daemon_mode;
1044
1045         git_config(upload_pack_config, NULL);
1046
1047         head_ref_namespaced(find_symref, &symref);
1048
1049         if (options->advertise_refs || !stateless_rpc) {
1050                 reset_timeout();
1051                 head_ref_namespaced(send_ref, &symref);
1052                 for_each_namespaced_ref(send_ref, &symref);
1053                 advertise_shallow_grafts(1);
1054                 packet_flush(1);
1055         } else {
1056                 head_ref_namespaced(check_ref, NULL);
1057                 for_each_namespaced_ref(check_ref, NULL);
1058         }
1059         string_list_clear(&symref, 1);
1060         if (options->advertise_refs)
1061                 return;
1062
1063         receive_needs();
1064         if (want_obj.nr) {
1065                 get_common_commits();
1066                 create_pack_file();
1067         }
1068 }
1069
1070 struct upload_pack_data {
1071         struct object_array wants;
1072         struct oid_array haves;
1073
1074         struct object_array shallows;
1075         struct string_list deepen_not;
1076         int depth;
1077         timestamp_t deepen_since;
1078         int deepen_rev_list;
1079         int deepen_relative;
1080
1081         unsigned stateless_rpc : 1;
1082
1083         unsigned use_thin_pack : 1;
1084         unsigned use_ofs_delta : 1;
1085         unsigned no_progress : 1;
1086         unsigned use_include_tag : 1;
1087         unsigned done : 1;
1088 };
1089
1090 static void upload_pack_data_init(struct upload_pack_data *data)
1091 {
1092         struct object_array wants = OBJECT_ARRAY_INIT;
1093         struct oid_array haves = OID_ARRAY_INIT;
1094         struct object_array shallows = OBJECT_ARRAY_INIT;
1095         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1096
1097         memset(data, 0, sizeof(*data));
1098         data->wants = wants;
1099         data->haves = haves;
1100         data->shallows = shallows;
1101         data->deepen_not = deepen_not;
1102 }
1103
1104 static void upload_pack_data_clear(struct upload_pack_data *data)
1105 {
1106         object_array_clear(&data->wants);
1107         oid_array_clear(&data->haves);
1108         object_array_clear(&data->shallows);
1109         string_list_clear(&data->deepen_not, 0);
1110 }
1111
1112 static int parse_want(const char *line)
1113 {
1114         const char *arg;
1115         if (skip_prefix(line, "want ", &arg)) {
1116                 struct object_id oid;
1117                 struct object *o;
1118
1119                 if (get_oid_hex(arg, &oid))
1120                         die("git upload-pack: protocol error, "
1121                             "expected to get oid, not '%s'", line);
1122
1123                 o = parse_object(the_repository, &oid);
1124                 if (!o) {
1125                         packet_write_fmt(1,
1126                                          "ERR upload-pack: not our ref %s",
1127                                          oid_to_hex(&oid));
1128                         die("git upload-pack: not our ref %s",
1129                             oid_to_hex(&oid));
1130                 }
1131
1132                 if (!(o->flags & WANTED)) {
1133                         o->flags |= WANTED;
1134                         add_object_array(o, NULL, &want_obj);
1135                 }
1136
1137                 return 1;
1138         }
1139
1140         return 0;
1141 }
1142
1143 static int parse_have(const char *line, struct oid_array *haves)
1144 {
1145         const char *arg;
1146         if (skip_prefix(line, "have ", &arg)) {
1147                 struct object_id oid;
1148
1149                 if (get_oid_hex(arg, &oid))
1150                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1151                 oid_array_append(haves, &oid);
1152                 return 1;
1153         }
1154
1155         return 0;
1156 }
1157
1158 static void process_args(struct packet_reader *request,
1159                          struct upload_pack_data *data)
1160 {
1161         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1162                 const char *arg = request->line;
1163                 const char *p;
1164
1165                 /* process want */
1166                 if (parse_want(arg))
1167                         continue;
1168                 /* process have line */
1169                 if (parse_have(arg, &data->haves))
1170                         continue;
1171
1172                 /* process args like thin-pack */
1173                 if (!strcmp(arg, "thin-pack")) {
1174                         use_thin_pack = 1;
1175                         continue;
1176                 }
1177                 if (!strcmp(arg, "ofs-delta")) {
1178                         use_ofs_delta = 1;
1179                         continue;
1180                 }
1181                 if (!strcmp(arg, "no-progress")) {
1182                         no_progress = 1;
1183                         continue;
1184                 }
1185                 if (!strcmp(arg, "include-tag")) {
1186                         use_include_tag = 1;
1187                         continue;
1188                 }
1189                 if (!strcmp(arg, "done")) {
1190                         data->done = 1;
1191                         continue;
1192                 }
1193
1194                 /* Shallow related arguments */
1195                 if (process_shallow(arg, &data->shallows))
1196                         continue;
1197                 if (process_deepen(arg, &data->depth))
1198                         continue;
1199                 if (process_deepen_since(arg, &data->deepen_since,
1200                                          &data->deepen_rev_list))
1201                         continue;
1202                 if (process_deepen_not(arg, &data->deepen_not,
1203                                        &data->deepen_rev_list))
1204                         continue;
1205                 if (!strcmp(arg, "deepen-relative")) {
1206                         data->deepen_relative = 1;
1207                         continue;
1208                 }
1209
1210                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1211                         parse_list_objects_filter(&filter_options, p);
1212                         continue;
1213                 }
1214
1215                 /* ignore unknown lines maybe? */
1216                 die("unexpected line: '%s'", arg);
1217         }
1218 }
1219
1220 static int process_haves(struct oid_array *haves, struct oid_array *common)
1221 {
1222         int i;
1223
1224         /* Process haves */
1225         for (i = 0; i < haves->nr; i++) {
1226                 const struct object_id *oid = &haves->oid[i];
1227                 struct object *o;
1228                 int we_knew_they_have = 0;
1229
1230                 if (!has_object_file(oid))
1231                         continue;
1232
1233                 oid_array_append(common, oid);
1234
1235                 o = parse_object(the_repository, oid);
1236                 if (!o)
1237                         die("oops (%s)", oid_to_hex(oid));
1238                 if (o->type == OBJ_COMMIT) {
1239                         struct commit_list *parents;
1240                         struct commit *commit = (struct commit *)o;
1241                         if (o->flags & THEY_HAVE)
1242                                 we_knew_they_have = 1;
1243                         else
1244                                 o->flags |= THEY_HAVE;
1245                         if (!oldest_have || (commit->date < oldest_have))
1246                                 oldest_have = commit->date;
1247                         for (parents = commit->parents;
1248                              parents;
1249                              parents = parents->next)
1250                                 parents->item->object.flags |= THEY_HAVE;
1251                 }
1252                 if (!we_knew_they_have)
1253                         add_object_array(o, NULL, &have_obj);
1254         }
1255
1256         return 0;
1257 }
1258
1259 static int send_acks(struct oid_array *acks, struct strbuf *response)
1260 {
1261         int i;
1262
1263         packet_buf_write(response, "acknowledgments\n");
1264
1265         /* Send Acks */
1266         if (!acks->nr)
1267                 packet_buf_write(response, "NAK\n");
1268
1269         for (i = 0; i < acks->nr; i++) {
1270                 packet_buf_write(response, "ACK %s\n",
1271                                  oid_to_hex(&acks->oid[i]));
1272         }
1273
1274         if (ok_to_give_up()) {
1275                 /* Send Ready */
1276                 packet_buf_write(response, "ready\n");
1277                 return 1;
1278         }
1279
1280         return 0;
1281 }
1282
1283 static int process_haves_and_send_acks(struct upload_pack_data *data)
1284 {
1285         struct oid_array common = OID_ARRAY_INIT;
1286         struct strbuf response = STRBUF_INIT;
1287         int ret = 0;
1288
1289         process_haves(&data->haves, &common);
1290         if (data->done) {
1291                 ret = 1;
1292         } else if (send_acks(&common, &response)) {
1293                 packet_buf_delim(&response);
1294                 ret = 1;
1295         } else {
1296                 /* Add Flush */
1297                 packet_buf_flush(&response);
1298                 ret = 0;
1299         }
1300
1301         /* Send response */
1302         write_or_die(1, response.buf, response.len);
1303         strbuf_release(&response);
1304
1305         oid_array_clear(&data->haves);
1306         oid_array_clear(&common);
1307         return ret;
1308 }
1309
1310 static void send_shallow_info(struct upload_pack_data *data)
1311 {
1312         /* No shallow info needs to be sent */
1313         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1314             !is_repository_shallow(the_repository))
1315                 return;
1316
1317         packet_write_fmt(1, "shallow-info\n");
1318
1319         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1320                                data->deepen_since, &data->deepen_not,
1321                                &data->shallows) &&
1322             is_repository_shallow(the_repository))
1323                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
1324
1325         packet_delim(1);
1326 }
1327
1328 enum fetch_state {
1329         FETCH_PROCESS_ARGS = 0,
1330         FETCH_SEND_ACKS,
1331         FETCH_SEND_PACK,
1332         FETCH_DONE,
1333 };
1334
1335 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1336                    struct packet_reader *request)
1337 {
1338         enum fetch_state state = FETCH_PROCESS_ARGS;
1339         struct upload_pack_data data;
1340
1341         git_config(upload_pack_config, NULL);
1342
1343         upload_pack_data_init(&data);
1344         use_sideband = LARGE_PACKET_MAX;
1345
1346         while (state != FETCH_DONE) {
1347                 switch (state) {
1348                 case FETCH_PROCESS_ARGS:
1349                         process_args(request, &data);
1350
1351                         if (!want_obj.nr) {
1352                                 /*
1353                                  * Request didn't contain any 'want' lines,
1354                                  * guess they didn't want anything.
1355                                  */
1356                                 state = FETCH_DONE;
1357                         } else if (data.haves.nr) {
1358                                 /*
1359                                  * Request had 'have' lines, so lets ACK them.
1360                                  */
1361                                 state = FETCH_SEND_ACKS;
1362                         } else {
1363                                 /*
1364                                  * Request had 'want's but no 'have's so we can
1365                                  * immedietly go to construct and send a pack.
1366                                  */
1367                                 state = FETCH_SEND_PACK;
1368                         }
1369                         break;
1370                 case FETCH_SEND_ACKS:
1371                         if (process_haves_and_send_acks(&data))
1372                                 state = FETCH_SEND_PACK;
1373                         else
1374                                 state = FETCH_DONE;
1375                         break;
1376                 case FETCH_SEND_PACK:
1377                         send_shallow_info(&data);
1378
1379                         packet_write_fmt(1, "packfile\n");
1380                         create_pack_file();
1381                         state = FETCH_DONE;
1382                         break;
1383                 case FETCH_DONE:
1384                         continue;
1385                 }
1386         }
1387
1388         upload_pack_data_clear(&data);
1389         return 0;
1390 }
1391
1392 int upload_pack_advertise(struct repository *r,
1393                           struct strbuf *value)
1394 {
1395         if (value) {
1396                 int allow_filter_value;
1397                 strbuf_addstr(value, "shallow");
1398                 if (!repo_config_get_bool(the_repository,
1399                                          "uploadpack.allowfilter",
1400                                          &allow_filter_value) &&
1401                     allow_filter_value)
1402                         strbuf_addstr(value, " filter");
1403         }
1404         return 1;
1405 }