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         if (!have_obj.nr)
 342                 return 0;
 343
 344         return can_all_from_reach_with_flag(&want_obj, THEY_HAVE,
 345                                             COMMON_KNOWN, oldest_have);
 346 }
 347
 348 static int get_common_commits(void)
 349 {
 350         struct object_id oid;
 351         char last_hex[GIT_MAX_HEXSZ + 1];
 352         int got_common = 0;
 353         int got_other = 0;
 354         int sent_ready = 0;
 355
 356         save_commit_buffer = 0;
 357
 358         for (;;) {
 359                 char *line = packet_read_line(0, NULL);
 360                 const char *arg;
 361
 362                 reset_timeout();
 363
 364                 if (!line) {
 365                         if (multi_ack == 2 && got_common
 366                             && !got_other && ok_to_give_up()) {
 367                                 sent_ready = 1;
 368                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 369                         }
 370                         if (have_obj.nr == 0 || multi_ack)
 371                                 packet_write_fmt(1, "NAK\n");
 372
 373                         if (no_done && sent_ready) {
 374                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 375                                 return 0;
 376                         }
 377                         if (stateless_rpc)
 378                                 exit(0);
 379                         got_common = 0;
 380                         got_other = 0;
 381                         continue;
 382                 }
 383                 if (skip_prefix(line, "have ", &arg)) {
 384                         switch (got_oid(arg, &oid)) {
 385                         case -1: /* they have what we do not */
 386                                 got_other = 1;
 387                                 if (multi_ack && ok_to_give_up()) {
 388                                         const char *hex = oid_to_hex(&oid);
 389                                         if (multi_ack == 2) {
 390                                                 sent_ready = 1;
 391                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 392                                         } else
 393                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 394                                 }
 395                                 break;
 396                         default:
 397                                 got_common = 1;
 398                                 oid_to_hex_r(last_hex, &oid);
 399                                 if (multi_ack == 2)
 400                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 401                                 else if (multi_ack)
 402                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 403                                 else if (have_obj.nr == 1)
 404                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 405                                 break;
 406                         }
 407                         continue;
 408                 }
 409                 if (!strcmp(line, "done")) {
 410                         if (have_obj.nr > 0) {
 411                                 if (multi_ack)
 412                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 413                                 return 0;
 414                         }
 415                         packet_write_fmt(1, "NAK\n");
 416                         return -1;
 417                 }
 418                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 419         }
 420 }
 421
 422 static int is_our_ref(struct object *o)
 423 {
 424         int allow_hidden_ref = (allow_unadvertised_object_request &
 425                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 426         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 427 }
 428
 429 /*
 430  * on successful case, it's up to the caller to close cmd->out
 431  */
 432 static int do_reachable_revlist(struct child_process *cmd,
 433                                 struct object_array *src,
 434                                 struct object_array *reachable)
 435 {
 436         static const char *argv[] = {
 437                 "rev-list", "--stdin", NULL,
 438         };
 439         struct object *o;
 440         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 441         int i;
 442
 443         cmd->argv = argv;
 444         cmd->git_cmd = 1;
 445         cmd->no_stderr = 1;
 446         cmd->in = -1;
 447         cmd->out = -1;
 448
 449         /*
 450          * If the next rev-list --stdin encounters an unknown commit,
 451          * it terminates, which will cause SIGPIPE in the write loop
 452          * below.
 453          */
 454         sigchain_push(SIGPIPE, SIG_IGN);
 455
 456         if (start_command(cmd))
 457                 goto error;
 458
 459         namebuf[0] = '^';
 460         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 461         for (i = get_max_object_index(); 0 < i; ) {
 462                 o = get_indexed_object(--i);
 463                 if (!o)
 464                         continue;
 465                 if (reachable && o->type == OBJ_COMMIT)
 466                         o->flags &= ~TMP_MARK;
 467                 if (!is_our_ref(o))
 468                         continue;
 469                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 470                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 471                         goto error;
 472         }
 473         namebuf[GIT_SHA1_HEXSZ] = '\n';
 474         for (i = 0; i < src->nr; i++) {
 475                 o = src->objects[i].item;
 476                 if (is_our_ref(o)) {
 477                         if (reachable)
 478                                 add_object_array(o, NULL, reachable);
 479                         continue;
 480                 }
 481                 if (reachable && o->type == OBJ_COMMIT)
 482                         o->flags |= TMP_MARK;
 483                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 484                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 485                         goto error;
 486         }
 487         close(cmd->in);
 488         cmd->in = -1;
 489         sigchain_pop(SIGPIPE);
 490
 491         return 0;
 492
 493 error:
 494         sigchain_pop(SIGPIPE);
 495
 496         if (cmd->in >= 0)
 497                 close(cmd->in);
 498         if (cmd->out >= 0)
 499                 close(cmd->out);
 500         return -1;
 501 }
 502
 503 static int get_reachable_list(struct object_array *src,
 504                               struct object_array *reachable)
 505 {
 506         struct child_process cmd = CHILD_PROCESS_INIT;
 507         int i;
 508         struct object *o;
 509         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 510         const unsigned hexsz = the_hash_algo->hexsz;
 511
 512         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 513                 return -1;
 514
 515         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 516                 struct object_id sha1;
 517                 const char *p;
 518
 519                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 520                         break;
 521
 522                 o = lookup_object(the_repository, sha1.hash);
 523                 if (o && o->type == OBJ_COMMIT) {
 524                         o->flags &= ~TMP_MARK;
 525                 }
 526         }
 527         for (i = get_max_object_index(); 0 < i; i--) {
 528                 o = get_indexed_object(i - 1);
 529                 if (o && o->type == OBJ_COMMIT &&
 530                     (o->flags & TMP_MARK)) {
 531                         add_object_array(o, NULL, reachable);
 532                                 o->flags &= ~TMP_MARK;
 533                 }
 534         }
 535         close(cmd.out);
 536
 537         if (finish_command(&cmd))
 538                 return -1;
 539
 540         return 0;
 541 }
 542
 543 static int has_unreachable(struct object_array *src)
 544 {
 545         struct child_process cmd = CHILD_PROCESS_INIT;
 546         char buf[1];
 547         int i;
 548
 549         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 550                 return 1;
 551
 552         /*
 553          * The commits out of the rev-list are not ancestors of
 554          * our ref.
 555          */
 556         i = read_in_full(cmd.out, buf, 1);
 557         if (i)
 558                 goto error;
 559         close(cmd.out);
 560         cmd.out = -1;
 561
 562         /*
 563          * rev-list may have died by encountering a bad commit
 564          * in the history, in which case we do want to bail out
 565          * even when it showed no commit.
 566          */
 567         if (finish_command(&cmd))
 568                 goto error;
 569
 570         /* All the non-tip ones are ancestors of what we advertised */
 571         return 0;
 572
 573 error:
 574         sigchain_pop(SIGPIPE);
 575         if (cmd.out >= 0)
 576                 close(cmd.out);
 577         return 1;
 578 }
 579
 580 static void check_non_tip(void)
 581 {
 582         int i;
 583
 584         /*
 585          * In the normal in-process case without
 586          * uploadpack.allowReachableSHA1InWant,
 587          * non-tip requests can never happen.
 588          */
 589         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 590                 goto error;
 591         if (!has_unreachable(&want_obj))
 592                 /* All the non-tip ones are ancestors of what we advertised */
 593                 return;
 594
 595 error:
 596         /* Pick one of them (we know there at least is one) */
 597         for (i = 0; i < want_obj.nr; i++) {
 598                 struct object *o = want_obj.objects[i].item;
 599                 if (!is_our_ref(o))
 600                         die("git upload-pack: not our ref %s",
 601                             oid_to_hex(&o->oid));
 602         }
 603 }
 604
 605 static void send_shallow(struct commit_list *result)
 606 {
 607         while (result) {
 608                 struct object *object = &result->item->object;
 609                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 610                         packet_write_fmt(1, "shallow %s",
 611                                          oid_to_hex(&object->oid));
 612                         register_shallow(the_repository, &object->oid);
 613                         shallow_nr++;
 614                 }
 615                 result = result->next;
 616         }
 617 }
 618
 619 static void send_unshallow(const struct object_array *shallows)
 620 {
 621         int i;
 622
 623         for (i = 0; i < shallows->nr; i++) {
 624                 struct object *object = shallows->objects[i].item;
 625                 if (object->flags & NOT_SHALLOW) {
 626                         struct commit_list *parents;
 627                         packet_write_fmt(1, "unshallow %s",
 628                                          oid_to_hex(&object->oid));
 629                         object->flags &= ~CLIENT_SHALLOW;
 630                         /*
 631                          * We want to _register_ "object" as shallow, but we
 632                          * also need to traverse object's parents to deepen a
 633                          * shallow clone. Unregister it for now so we can
 634                          * parse and add the parents to the want list, then
 635                          * re-register it.
 636                          */
 637                         unregister_shallow(&object->oid);
 638                         object->parsed = 0;
 639                         parse_commit_or_die((struct commit *)object);
 640                         parents = ((struct commit *)object)->parents;
 641                         while (parents) {
 642                                 add_object_array(&parents->item->object,
 643                                                  NULL, &want_obj);
 644                                 parents = parents->next;
 645                         }
 646                         add_object_array(object, NULL, &extra_edge_obj);
 647                 }
 648                 /* make sure commit traversal conforms to client */
 649                 register_shallow(the_repository, &object->oid);
 650         }
 651 }
 652
 653 static void deepen(int depth, int deepen_relative,
 654                    struct object_array *shallows)
 655 {
 656         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 657                 int i;
 658
 659                 for (i = 0; i < shallows->nr; i++) {
 660                         struct object *object = shallows->objects[i].item;
 661                         object->flags |= NOT_SHALLOW;
 662                 }
 663         } else if (deepen_relative) {
 664                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 665                 struct commit_list *result;
 666
 667                 get_reachable_list(shallows, &reachable_shallows);
 668                 result = get_shallow_commits(&reachable_shallows,
 669                                              depth + 1,
 670                                              SHALLOW, NOT_SHALLOW);
 671                 send_shallow(result);
 672                 free_commit_list(result);
 673                 object_array_clear(&reachable_shallows);
 674         } else {
 675                 struct commit_list *result;
 676
 677                 result = get_shallow_commits(&want_obj, depth,
 678                                              SHALLOW, NOT_SHALLOW);
 679                 send_shallow(result);
 680                 free_commit_list(result);
 681         }
 682
 683         send_unshallow(shallows);
 684 }
 685
 686 static void deepen_by_rev_list(int ac, const char **av,
 687                                struct object_array *shallows)
 688 {
 689         struct commit_list *result;
 690
 691         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 692         send_shallow(result);
 693         free_commit_list(result);
 694         send_unshallow(shallows);
 695 }
 696
 697 /* Returns 1 if a shallow list is sent or 0 otherwise */
 698 static int send_shallow_list(int depth, int deepen_rev_list,
 699                              timestamp_t deepen_since,
 700                              struct string_list *deepen_not,
 701                              struct object_array *shallows)
 702 {
 703         int ret = 0;
 704
 705         if (depth > 0 && deepen_rev_list)
 706                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 707         if (depth > 0) {
 708                 deepen(depth, deepen_relative, shallows);
 709                 ret = 1;
 710         } else if (deepen_rev_list) {
 711                 struct argv_array av = ARGV_ARRAY_INIT;
 712                 int i;
 713
 714                 argv_array_push(&av, "rev-list");
 715                 if (deepen_since)
 716                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 717                 if (deepen_not->nr) {
 718                         argv_array_push(&av, "--not");
 719                         for (i = 0; i < deepen_not->nr; i++) {
 720                                 struct string_list_item *s = deepen_not->items + i;
 721                                 argv_array_push(&av, s->string);
 722                         }
 723                         argv_array_push(&av, "--not");
 724                 }
 725                 for (i = 0; i < want_obj.nr; i++) {
 726                         struct object *o = want_obj.objects[i].item;
 727                         argv_array_push(&av, oid_to_hex(&o->oid));
 728                 }
 729                 deepen_by_rev_list(av.argc, av.argv, shallows);
 730                 argv_array_clear(&av);
 731                 ret = 1;
 732         } else {
 733                 if (shallows->nr > 0) {
 734                         int i;
 735                         for (i = 0; i < shallows->nr; i++)
 736                                 register_shallow(the_repository,
 737                                                  &shallows->objects[i].item->oid);
 738                 }
 739         }
 740
 741         shallow_nr += shallows->nr;
 742         return ret;
 743 }
 744
 745 static int process_shallow(const char *line, struct object_array *shallows)
 746 {
 747         const char *arg;
 748         if (skip_prefix(line, "shallow ", &arg)) {
 749                 struct object_id oid;
 750                 struct object *object;
 751                 if (get_oid_hex(arg, &oid))
 752                         die("invalid shallow line: %s", line);
 753                 object = parse_object(the_repository, &oid);
 754                 if (!object)
 755                         return 1;
 756                 if (object->type != OBJ_COMMIT)
 757                         die("invalid shallow object %s", oid_to_hex(&oid));
 758                 if (!(object->flags & CLIENT_SHALLOW)) {
 759                         object->flags |= CLIENT_SHALLOW;
 760                         add_object_array(object, NULL, shallows);
 761                 }
 762                 return 1;
 763         }
 764
 765         return 0;
 766 }
 767
 768 static int process_deepen(const char *line, int *depth)
 769 {
 770         const char *arg;
 771         if (skip_prefix(line, "deepen ", &arg)) {
 772                 char *end = NULL;
 773                 *depth = (int)strtol(arg, &end, 0);
 774                 if (!end || *end || *depth <= 0)
 775                         die("Invalid deepen: %s", line);
 776                 return 1;
 777         }
 778
 779         return 0;
 780 }
 781
 782 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 783 {
 784         const char *arg;
 785         if (skip_prefix(line, "deepen-since ", &arg)) {
 786                 char *end = NULL;
 787                 *deepen_since = parse_timestamp(arg, &end, 0);
 788                 if (!end || *end || !deepen_since ||
 789                     /* revisions.c's max_age -1 is special */
 790                     *deepen_since == -1)
 791                         die("Invalid deepen-since: %s", line);
 792                 *deepen_rev_list = 1;
 793                 return 1;
 794         }
 795         return 0;
 796 }
 797
 798 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 799 {
 800         const char *arg;
 801         if (skip_prefix(line, "deepen-not ", &arg)) {
 802                 char *ref = NULL;
 803                 struct object_id oid;
 804                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 805                         die("git upload-pack: ambiguous deepen-not: %s", line);
 806                 string_list_append(deepen_not, ref);
 807                 free(ref);
 808                 *deepen_rev_list = 1;
 809                 return 1;
 810         }
 811         return 0;
 812 }
 813
 814 static void receive_needs(void)
 815 {
 816         struct object_array shallows = OBJECT_ARRAY_INIT;
 817         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 818         int depth = 0;
 819         int has_non_tip = 0;
 820         timestamp_t deepen_since = 0;
 821         int deepen_rev_list = 0;
 822
 823         shallow_nr = 0;
 824         for (;;) {
 825                 struct object *o;
 826                 const char *features;
 827                 struct object_id oid_buf;
 828                 char *line = packet_read_line(0, NULL);
 829                 const char *arg;
 830
 831                 reset_timeout();
 832                 if (!line)
 833                         break;
 834
 835                 if (process_shallow(line, &shallows))
 836                         continue;
 837                 if (process_deepen(line, &depth))
 838                         continue;
 839                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 840                         continue;
 841                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 842                         continue;
 843
 844                 if (skip_prefix(line, "filter ", &arg)) {
 845                         if (!filter_capability_requested)
 846                                 die("git upload-pack: filtering capability not negotiated");
 847                         parse_list_objects_filter(&filter_options, arg);
 848                         continue;
 849                 }
 850
 851                 if (!skip_prefix(line, "want ", &arg) ||
 852                     parse_oid_hex(arg, &oid_buf, &features))
 853                         die("git upload-pack: protocol error, "
 854                             "expected to get object ID, not '%s'", line);
 855
 856                 if (parse_feature_request(features, "deepen-relative"))
 857                         deepen_relative = 1;
 858                 if (parse_feature_request(features, "multi_ack_detailed"))
 859                         multi_ack = 2;
 860                 else if (parse_feature_request(features, "multi_ack"))
 861                         multi_ack = 1;
 862                 if (parse_feature_request(features, "no-done"))
 863                         no_done = 1;
 864                 if (parse_feature_request(features, "thin-pack"))
 865                         use_thin_pack = 1;
 866                 if (parse_feature_request(features, "ofs-delta"))
 867                         use_ofs_delta = 1;
 868                 if (parse_feature_request(features, "side-band-64k"))
 869                         use_sideband = LARGE_PACKET_MAX;
 870                 else if (parse_feature_request(features, "side-band"))
 871                         use_sideband = DEFAULT_PACKET_MAX;
 872                 if (parse_feature_request(features, "no-progress"))
 873                         no_progress = 1;
 874                 if (parse_feature_request(features, "include-tag"))
 875                         use_include_tag = 1;
 876                 if (allow_filter && parse_feature_request(features, "filter"))
 877                         filter_capability_requested = 1;
 878
 879                 o = parse_object(the_repository, &oid_buf);
 880                 if (!o) {
 881                         packet_write_fmt(1,
 882                                          "ERR upload-pack: not our ref %s",
 883                                          oid_to_hex(&oid_buf));
 884                         die("git upload-pack: not our ref %s",
 885                             oid_to_hex(&oid_buf));
 886                 }
 887                 if (!(o->flags & WANTED)) {
 888                         o->flags |= WANTED;
 889                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 890                               || is_our_ref(o)))
 891                                 has_non_tip = 1;
 892                         add_object_array(o, NULL, &want_obj);
 893                 }
 894         }
 895
 896         /*
 897          * We have sent all our refs already, and the other end
 898          * should have chosen out of them. When we are operating
 899          * in the stateless RPC mode, however, their choice may
 900          * have been based on the set of older refs advertised
 901          * by another process that handled the initial request.
 902          */
 903         if (has_non_tip)
 904                 check_non_tip();
 905
 906         if (!use_sideband && daemon_mode)
 907                 no_progress = 1;
 908
 909         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 910                 return;
 911
 912         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 913                               &deepen_not, &shallows))
 914                 packet_flush(1);
 915         object_array_clear(&shallows);
 916 }
 917
 918 /* return non-zero if the ref is hidden, otherwise 0 */
 919 static int mark_our_ref(const char *refname, const char *refname_full,
 920                         const struct object_id *oid)
 921 {
 922         struct object *o = lookup_unknown_object(oid->hash);
 923
 924         if (ref_is_hidden(refname, refname_full)) {
 925                 o->flags |= HIDDEN_REF;
 926                 return 1;
 927         }
 928         o->flags |= OUR_REF;
 929         return 0;
 930 }
 931
 932 static int check_ref(const char *refname_full, const struct object_id *oid,
 933                      int flag, void *cb_data)
 934 {
 935         const char *refname = strip_namespace(refname_full);
 936
 937         mark_our_ref(refname, refname_full, oid);
 938         return 0;
 939 }
 940
 941 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 942 {
 943         struct string_list_item *item;
 944
 945         if (!symref->nr)
 946                 return;
 947         for_each_string_list_item(item, symref)
 948                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 949 }
 950
 951 static int send_ref(const char *refname, const struct object_id *oid,
 952                     int flag, void *cb_data)
 953 {
 954         static const char *capabilities = "multi_ack thin-pack side-band"
 955                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 956                 " deepen-relative no-progress include-tag multi_ack_detailed";
 957         const char *refname_nons = strip_namespace(refname);
 958         struct object_id peeled;
 959
 960         if (mark_our_ref(refname_nons, refname, oid))
 961                 return 0;
 962
 963         if (capabilities) {
 964                 struct strbuf symref_info = STRBUF_INIT;
 965
 966                 format_symref_info(&symref_info, cb_data);
 967                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
 968                              oid_to_hex(oid), refname_nons,
 969                              0, capabilities,
 970                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 971                                      " allow-tip-sha1-in-want" : "",
 972                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 973                                      " allow-reachable-sha1-in-want" : "",
 974                              stateless_rpc ? " no-done" : "",
 975                              symref_info.buf,
 976                              allow_filter ? " filter" : "",
 977                              git_user_agent_sanitized());
 978                 strbuf_release(&symref_info);
 979         } else {
 980                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 981         }
 982         capabilities = NULL;
 983         if (!peel_ref(refname, &peeled))
 984                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 985         return 0;
 986 }
 987
 988 static int find_symref(const char *refname, const struct object_id *oid,
 989                        int flag, void *cb_data)
 990 {
 991         const char *symref_target;
 992         struct string_list_item *item;
 993
 994         if ((flag & REF_ISSYMREF) == 0)
 995                 return 0;
 996         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
 997         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 998                 die("'%s' is a symref but it is not?", refname);
 999         item = string_list_append(cb_data, refname);
1000         item->util = xstrdup(symref_target);
1001         return 0;
1002 }
1003
1004 static int upload_pack_config(const char *var, const char *value, void *unused)
1005 {
1006         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1007                 if (git_config_bool(var, value))
1008                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1009                 else
1010                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1011         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1012                 if (git_config_bool(var, value))
1013                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1014                 else
1015                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1016         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1017                 if (git_config_bool(var, value))
1018                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1019                 else
1020                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1021         } else if (!strcmp("uploadpack.keepalive", var)) {
1022                 keepalive = git_config_int(var, value);
1023                 if (!keepalive)
1024                         keepalive = -1;
1025         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1026                 if (!strcmp("uploadpack.packobjectshook", var))
1027                         return git_config_string(&pack_objects_hook, var, value);
1028         } else if (!strcmp("uploadpack.allowfilter", var)) {
1029                 allow_filter = git_config_bool(var, value);
1030         }
1031         return parse_hide_refs_config(var, value, "uploadpack");
1032 }
1033
1034 void upload_pack(struct upload_pack_options *options)
1035 {
1036         struct string_list symref = STRING_LIST_INIT_DUP;
1037
1038         stateless_rpc = options->stateless_rpc;
1039         timeout = options->timeout;
1040         daemon_mode = options->daemon_mode;
1041
1042         git_config(upload_pack_config, NULL);
1043
1044         head_ref_namespaced(find_symref, &symref);
1045
1046         if (options->advertise_refs || !stateless_rpc) {
1047                 reset_timeout();
1048                 head_ref_namespaced(send_ref, &symref);
1049                 for_each_namespaced_ref(send_ref, &symref);
1050                 advertise_shallow_grafts(1);
1051                 packet_flush(1);
1052         } else {
1053                 head_ref_namespaced(check_ref, NULL);
1054                 for_each_namespaced_ref(check_ref, NULL);
1055         }
1056         string_list_clear(&symref, 1);
1057         if (options->advertise_refs)
1058                 return;
1059
1060         receive_needs();
1061         if (want_obj.nr) {
1062                 get_common_commits();
1063                 create_pack_file();
1064         }
1065 }
1066
1067 struct upload_pack_data {
1068         struct object_array wants;
1069         struct oid_array haves;
1070
1071         struct object_array shallows;
1072         struct string_list deepen_not;
1073         int depth;
1074         timestamp_t deepen_since;
1075         int deepen_rev_list;
1076         int deepen_relative;
1077
1078         unsigned stateless_rpc : 1;
1079
1080         unsigned use_thin_pack : 1;
1081         unsigned use_ofs_delta : 1;
1082         unsigned no_progress : 1;
1083         unsigned use_include_tag : 1;
1084         unsigned done : 1;
1085 };
1086
1087 static void upload_pack_data_init(struct upload_pack_data *data)
1088 {
1089         struct object_array wants = OBJECT_ARRAY_INIT;
1090         struct oid_array haves = OID_ARRAY_INIT;
1091         struct object_array shallows = OBJECT_ARRAY_INIT;
1092         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1093
1094         memset(data, 0, sizeof(*data));
1095         data->wants = wants;
1096         data->haves = haves;
1097         data->shallows = shallows;
1098         data->deepen_not = deepen_not;
1099 }
1100
1101 static void upload_pack_data_clear(struct upload_pack_data *data)
1102 {
1103         object_array_clear(&data->wants);
1104         oid_array_clear(&data->haves);
1105         object_array_clear(&data->shallows);
1106         string_list_clear(&data->deepen_not, 0);
1107 }
1108
1109 static int parse_want(const char *line)
1110 {
1111         const char *arg;
1112         if (skip_prefix(line, "want ", &arg)) {
1113                 struct object_id oid;
1114                 struct object *o;
1115
1116                 if (get_oid_hex(arg, &oid))
1117                         die("git upload-pack: protocol error, "
1118                             "expected to get oid, not '%s'", line);
1119
1120                 o = parse_object(the_repository, &oid);
1121                 if (!o) {
1122                         packet_write_fmt(1,
1123                                          "ERR upload-pack: not our ref %s",
1124                                          oid_to_hex(&oid));
1125                         die("git upload-pack: not our ref %s",
1126                             oid_to_hex(&oid));
1127                 }
1128
1129                 if (!(o->flags & WANTED)) {
1130                         o->flags |= WANTED;
1131                         add_object_array(o, NULL, &want_obj);
1132                 }
1133
1134                 return 1;
1135         }
1136
1137         return 0;
1138 }
1139
1140 static int parse_have(const char *line, struct oid_array *haves)
1141 {
1142         const char *arg;
1143         if (skip_prefix(line, "have ", &arg)) {
1144                 struct object_id oid;
1145
1146                 if (get_oid_hex(arg, &oid))
1147                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1148                 oid_array_append(haves, &oid);
1149                 return 1;
1150         }
1151
1152         return 0;
1153 }
1154
1155 static void process_args(struct packet_reader *request,
1156                          struct upload_pack_data *data)
1157 {
1158         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1159                 const char *arg = request->line;
1160                 const char *p;
1161
1162                 /* process want */
1163                 if (parse_want(arg))
1164                         continue;
1165                 /* process have line */
1166                 if (parse_have(arg, &data->haves))
1167                         continue;
1168
1169                 /* process args like thin-pack */
1170                 if (!strcmp(arg, "thin-pack")) {
1171                         use_thin_pack = 1;
1172                         continue;
1173                 }
1174                 if (!strcmp(arg, "ofs-delta")) {
1175                         use_ofs_delta = 1;
1176                         continue;
1177                 }
1178                 if (!strcmp(arg, "no-progress")) {
1179                         no_progress = 1;
1180                         continue;
1181                 }
1182                 if (!strcmp(arg, "include-tag")) {
1183                         use_include_tag = 1;
1184                         continue;
1185                 }
1186                 if (!strcmp(arg, "done")) {
1187                         data->done = 1;
1188                         continue;
1189                 }
1190
1191                 /* Shallow related arguments */
1192                 if (process_shallow(arg, &data->shallows))
1193                         continue;
1194                 if (process_deepen(arg, &data->depth))
1195                         continue;
1196                 if (process_deepen_since(arg, &data->deepen_since,
1197                                          &data->deepen_rev_list))
1198                         continue;
1199                 if (process_deepen_not(arg, &data->deepen_not,
1200                                        &data->deepen_rev_list))
1201                         continue;
1202                 if (!strcmp(arg, "deepen-relative")) {
1203                         data->deepen_relative = 1;
1204                         continue;
1205                 }
1206
1207                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1208                         parse_list_objects_filter(&filter_options, p);
1209                         continue;
1210                 }
1211
1212                 /* ignore unknown lines maybe? */
1213                 die("unexpected line: '%s'", arg);
1214         }
1215 }
1216
1217 static int process_haves(struct oid_array *haves, struct oid_array *common)
1218 {
1219         int i;
1220
1221         /* Process haves */
1222         for (i = 0; i < haves->nr; i++) {
1223                 const struct object_id *oid = &haves->oid[i];
1224                 struct object *o;
1225                 int we_knew_they_have = 0;
1226
1227                 if (!has_object_file(oid))
1228                         continue;
1229
1230                 oid_array_append(common, oid);
1231
1232                 o = parse_object(the_repository, oid);
1233                 if (!o)
1234                         die("oops (%s)", oid_to_hex(oid));
1235                 if (o->type == OBJ_COMMIT) {
1236                         struct commit_list *parents;
1237                         struct commit *commit = (struct commit *)o;
1238                         if (o->flags & THEY_HAVE)
1239                                 we_knew_they_have = 1;
1240                         else
1241                                 o->flags |= THEY_HAVE;
1242                         if (!oldest_have || (commit->date < oldest_have))
1243                                 oldest_have = commit->date;
1244                         for (parents = commit->parents;
1245                              parents;
1246                              parents = parents->next)
1247                                 parents->item->object.flags |= THEY_HAVE;
1248                 }
1249                 if (!we_knew_they_have)
1250                         add_object_array(o, NULL, &have_obj);
1251         }
1252
1253         return 0;
1254 }
1255
1256 static int send_acks(struct oid_array *acks, struct strbuf *response)
1257 {
1258         int i;
1259
1260         packet_buf_write(response, "acknowledgments\n");
1261
1262         /* Send Acks */
1263         if (!acks->nr)
1264                 packet_buf_write(response, "NAK\n");
1265
1266         for (i = 0; i < acks->nr; i++) {
1267                 packet_buf_write(response, "ACK %s\n",
1268                                  oid_to_hex(&acks->oid[i]));
1269         }
1270
1271         if (ok_to_give_up()) {
1272                 /* Send Ready */
1273                 packet_buf_write(response, "ready\n");
1274                 return 1;
1275         }
1276
1277         return 0;
1278 }
1279
1280 static int process_haves_and_send_acks(struct upload_pack_data *data)
1281 {
1282         struct oid_array common = OID_ARRAY_INIT;
1283         struct strbuf response = STRBUF_INIT;
1284         int ret = 0;
1285
1286         process_haves(&data->haves, &common);
1287         if (data->done) {
1288                 ret = 1;
1289         } else if (send_acks(&common, &response)) {
1290                 packet_buf_delim(&response);
1291                 ret = 1;
1292         } else {
1293                 /* Add Flush */
1294                 packet_buf_flush(&response);
1295                 ret = 0;
1296         }
1297
1298         /* Send response */
1299         write_or_die(1, response.buf, response.len);
1300         strbuf_release(&response);
1301
1302         oid_array_clear(&data->haves);
1303         oid_array_clear(&common);
1304         return ret;
1305 }
1306
1307 static void send_shallow_info(struct upload_pack_data *data)
1308 {
1309         /* No shallow info needs to be sent */
1310         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1311             !is_repository_shallow(the_repository))
1312                 return;
1313
1314         packet_write_fmt(1, "shallow-info\n");
1315
1316         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1317                                data->deepen_since, &data->deepen_not,
1318                                &data->shallows) &&
1319             is_repository_shallow(the_repository))
1320                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
1321
1322         packet_delim(1);
1323 }
1324
1325 enum fetch_state {
1326         FETCH_PROCESS_ARGS = 0,
1327         FETCH_SEND_ACKS,
1328         FETCH_SEND_PACK,
1329         FETCH_DONE,
1330 };
1331
1332 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1333                    struct packet_reader *request)
1334 {
1335         enum fetch_state state = FETCH_PROCESS_ARGS;
1336         struct upload_pack_data data;
1337
1338         git_config(upload_pack_config, NULL);
1339
1340         upload_pack_data_init(&data);
1341         use_sideband = LARGE_PACKET_MAX;
1342
1343         while (state != FETCH_DONE) {
1344                 switch (state) {
1345                 case FETCH_PROCESS_ARGS:
1346                         process_args(request, &data);
1347
1348                         if (!want_obj.nr) {
1349                                 /*
1350                                  * Request didn't contain any 'want' lines,
1351                                  * guess they didn't want anything.
1352                                  */
1353                                 state = FETCH_DONE;
1354                         } else if (data.haves.nr) {
1355                                 /*
1356                                  * Request had 'have' lines, so lets ACK them.
1357                                  */
1358                                 state = FETCH_SEND_ACKS;
1359                         } else {
1360                                 /*
1361                                  * Request had 'want's but no 'have's so we can
1362                                  * immedietly go to construct and send a pack.
1363                                  */
1364                                 state = FETCH_SEND_PACK;
1365                         }
1366                         break;
1367                 case FETCH_SEND_ACKS:
1368                         if (process_haves_and_send_acks(&data))
1369                                 state = FETCH_SEND_PACK;
1370                         else
1371                                 state = FETCH_DONE;
1372                         break;
1373                 case FETCH_SEND_PACK:
1374                         send_shallow_info(&data);
1375
1376                         packet_write_fmt(1, "packfile\n");
1377                         create_pack_file();
1378                         state = FETCH_DONE;
1379                         break;
1380                 case FETCH_DONE:
1381                         continue;
1382                 }
1383         }
1384
1385         upload_pack_data_clear(&data);
1386         return 0;
1387 }
1388
1389 int upload_pack_advertise(struct repository *r,
1390                           struct strbuf *value)
1391 {
1392         if (value) {
1393                 int allow_filter_value;
1394                 strbuf_addstr(value, "shallow");
1395                 if (!repo_config_get_bool(the_repository,
1396                                          "uploadpack.allowfilter",
1397                                          &allow_filter_value) &&
1398                     allow_filter_value)
1399                         strbuf_addstr(value, " filter");
1400         }
1401         return 1;
1402 }