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-graph.h"
  28 #include "commit-reach.h"
  29
  30 /* Remember to update object flag allocation in object.h */
  31 #define THEY_HAVE       (1u << 11)
  32 #define OUR_REF         (1u << 12)
  33 #define WANTED          (1u << 13)
  34 #define COMMON_KNOWN    (1u << 14)
  35
  36 #define SHALLOW         (1u << 16)
  37 #define NOT_SHALLOW     (1u << 17)
  38 #define CLIENT_SHALLOW  (1u << 18)
  39 #define HIDDEN_REF      (1u << 19)
  40
  41 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
  42                 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
  43
  44 static timestamp_t oldest_have;
  45
  46 static int deepen_relative;
  47 static int multi_ack;
  48 static int no_done;
  49 static int use_thin_pack, use_ofs_delta, use_include_tag;
  50 static int no_progress, daemon_mode;
  51 /* Allow specifying sha1 if it is a ref tip. */
  52 #define ALLOW_TIP_SHA1  01
  53 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  54 #define ALLOW_REACHABLE_SHA1    02
  55 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  56 #define ALLOW_ANY_SHA1  07
  57 static unsigned int allow_unadvertised_object_request;
  58 static int shallow_nr;
  59 static struct object_array extra_edge_obj;
  60 static unsigned int timeout;
  61 static int keepalive = 5;
  62 /* 0 for no sideband,
  63  * otherwise maximum packet size (up to 65520 bytes).
  64  */
  65 static int use_sideband;
  66 static int stateless_rpc;
  67 static const char *pack_objects_hook;
  68
  69 static int filter_capability_requested;
  70 static int allow_filter;
  71 static int allow_ref_in_want;
  72 static struct list_objects_filter_options filter_options;
  73
  74 static void reset_timeout(void)
  75 {
  76         alarm(timeout);
  77 }
  78
  79 static void send_client_data(int fd, const char *data, ssize_t sz)
  80 {
  81         if (use_sideband) {
  82                 send_sideband(1, fd, data, sz, use_sideband);
  83                 return;
  84         }
  85         if (fd == 3)
  86                 /* emergency quit */
  87                 fd = 2;
  88         if (fd == 2) {
  89                 /* XXX: are we happy to lose stuff here? */
  90                 xwrite(fd, data, sz);
  91                 return;
  92         }
  93         write_or_die(fd, data, sz);
  94 }
  95
  96 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  97 {
  98         FILE *fp = cb_data;
  99         if (graft->nr_parent == -1)
 100                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 101         return 0;
 102 }
 103
 104 static void create_pack_file(const struct object_array *have_obj,
 105                              const struct object_array *want_obj)
 106 {
 107         struct child_process pack_objects = CHILD_PROCESS_INIT;
 108         char data[8193], progress[128];
 109         char abort_msg[] = "aborting due to possible repository "
 110                 "corruption on the remote side.";
 111         int buffered = -1;
 112         ssize_t sz;
 113         int i;
 114         FILE *pipe_fd;
 115
 116         if (!pack_objects_hook)
 117                 pack_objects.git_cmd = 1;
 118         else {
 119                 argv_array_push(&pack_objects.args, pack_objects_hook);
 120                 argv_array_push(&pack_objects.args, "git");
 121                 pack_objects.use_shell = 1;
 122         }
 123
 124         if (shallow_nr) {
 125                 argv_array_push(&pack_objects.args, "--shallow-file");
 126                 argv_array_push(&pack_objects.args, "");
 127         }
 128         argv_array_push(&pack_objects.args, "pack-objects");
 129         argv_array_push(&pack_objects.args, "--revs");
 130         if (use_thin_pack)
 131                 argv_array_push(&pack_objects.args, "--thin");
 132
 133         argv_array_push(&pack_objects.args, "--stdout");
 134         if (shallow_nr)
 135                 argv_array_push(&pack_objects.args, "--shallow");
 136         if (!no_progress)
 137                 argv_array_push(&pack_objects.args, "--progress");
 138         if (use_ofs_delta)
 139                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 140         if (use_include_tag)
 141                 argv_array_push(&pack_objects.args, "--include-tag");
 142         if (filter_options.filter_spec) {
 143                 struct strbuf expanded_filter_spec = STRBUF_INIT;
 144                 expand_list_objects_filter_spec(&filter_options,
 145                                                 &expanded_filter_spec);
 146                 if (pack_objects.use_shell) {
 147                         struct strbuf buf = STRBUF_INIT;
 148                         sq_quote_buf(&buf, expanded_filter_spec.buf);
 149                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 150                         strbuf_release(&buf);
 151                 } else {
 152                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 153                                          expanded_filter_spec.buf);
 154                 }
 155         }
 156
 157         pack_objects.in = -1;
 158         pack_objects.out = -1;
 159         pack_objects.err = -1;
 160
 161         if (start_command(&pack_objects))
 162                 die("git upload-pack: unable to fork git-pack-objects");
 163
 164         pipe_fd = xfdopen(pack_objects.in, "w");
 165
 166         if (shallow_nr)
 167                 for_each_commit_graft(write_one_shallow, pipe_fd);
 168
 169         for (i = 0; i < want_obj->nr; i++)
 170                 fprintf(pipe_fd, "%s\n",
 171                         oid_to_hex(&want_obj->objects[i].item->oid));
 172         fprintf(pipe_fd, "--not\n");
 173         for (i = 0; i < have_obj->nr; i++)
 174                 fprintf(pipe_fd, "%s\n",
 175                         oid_to_hex(&have_obj->objects[i].item->oid));
 176         for (i = 0; i < extra_edge_obj.nr; i++)
 177                 fprintf(pipe_fd, "%s\n",
 178                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 179         fprintf(pipe_fd, "\n");
 180         fflush(pipe_fd);
 181         fclose(pipe_fd);
 182
 183         /* We read from pack_objects.err to capture stderr output for
 184          * progress bar, and pack_objects.out to capture the pack data.
 185          */
 186
 187         while (1) {
 188                 struct pollfd pfd[2];
 189                 int pe, pu, pollsize;
 190                 int ret;
 191
 192                 reset_timeout();
 193
 194                 pollsize = 0;
 195                 pe = pu = -1;
 196
 197                 if (0 <= pack_objects.out) {
 198                         pfd[pollsize].fd = pack_objects.out;
 199                         pfd[pollsize].events = POLLIN;
 200                         pu = pollsize;
 201                         pollsize++;
 202                 }
 203                 if (0 <= pack_objects.err) {
 204                         pfd[pollsize].fd = pack_objects.err;
 205                         pfd[pollsize].events = POLLIN;
 206                         pe = pollsize;
 207                         pollsize++;
 208                 }
 209
 210                 if (!pollsize)
 211                         break;
 212
 213                 ret = poll(pfd, pollsize,
 214                         keepalive < 0 ? -1 : 1000 * keepalive);
 215
 216                 if (ret < 0) {
 217                         if (errno != EINTR) {
 218                                 error_errno("poll failed, resuming");
 219                                 sleep(1);
 220                         }
 221                         continue;
 222                 }
 223                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 224                         /* Status ready; we ship that in the side-band
 225                          * or dump to the standard error.
 226                          */
 227                         sz = xread(pack_objects.err, progress,
 228                                   sizeof(progress));
 229                         if (0 < sz)
 230                                 send_client_data(2, progress, sz);
 231                         else if (sz == 0) {
 232                                 close(pack_objects.err);
 233                                 pack_objects.err = -1;
 234                         }
 235                         else
 236                                 goto fail;
 237                         /* give priority to status messages */
 238                         continue;
 239                 }
 240                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 241                         /* Data ready; we keep the last byte to ourselves
 242                          * in case we detect broken rev-list, so that we
 243                          * can leave the stream corrupted.  This is
 244                          * unfortunate -- unpack-objects would happily
 245                          * accept a valid packdata with trailing garbage,
 246                          * so appending garbage after we pass all the
 247                          * pack data is not good enough to signal
 248                          * breakage to downstream.
 249                          */
 250                         char *cp = data;
 251                         ssize_t outsz = 0;
 252                         if (0 <= buffered) {
 253                                 *cp++ = buffered;
 254                                 outsz++;
 255                         }
 256                         sz = xread(pack_objects.out, cp,
 257                                   sizeof(data) - outsz);
 258                         if (0 < sz)
 259                                 ;
 260                         else if (sz == 0) {
 261                                 close(pack_objects.out);
 262                                 pack_objects.out = -1;
 263                         }
 264                         else
 265                                 goto fail;
 266                         sz += outsz;
 267                         if (1 < sz) {
 268                                 buffered = data[sz-1] & 0xFF;
 269                                 sz--;
 270                         }
 271                         else
 272                                 buffered = -1;
 273                         send_client_data(1, data, sz);
 274                 }
 275
 276                 /*
 277                  * We hit the keepalive timeout without saying anything; send
 278                  * an empty message on the data sideband just to let the other
 279                  * side know we're still working on it, but don't have any data
 280                  * yet.
 281                  *
 282                  * If we don't have a sideband channel, there's no room in the
 283                  * protocol to say anything, so those clients are just out of
 284                  * luck.
 285                  */
 286                 if (!ret && use_sideband) {
 287                         static const char buf[] = "0005\1";
 288                         write_or_die(1, buf, 5);
 289                 }
 290         }
 291
 292         if (finish_command(&pack_objects)) {
 293                 error("git upload-pack: git-pack-objects died with error.");
 294                 goto fail;
 295         }
 296
 297         /* flush the data */
 298         if (0 <= buffered) {
 299                 data[0] = buffered;
 300                 send_client_data(1, data, 1);
 301                 fprintf(stderr, "flushed.\n");
 302         }
 303         if (use_sideband)
 304                 packet_flush(1);
 305         return;
 306
 307  fail:
 308         send_client_data(3, abort_msg, sizeof(abort_msg));
 309         die("git upload-pack: %s", abort_msg);
 310 }
 311
 312 static int got_oid(const char *hex, struct object_id *oid,
 313                    struct object_array *have_obj)
 314 {
 315         struct object *o;
 316         int we_knew_they_have = 0;
 317
 318         if (get_oid_hex(hex, oid))
 319                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 320         if (!has_object_file(oid))
 321                 return -1;
 322
 323         o = parse_object(the_repository, oid);
 324         if (!o)
 325                 die("oops (%s)", oid_to_hex(oid));
 326         if (o->type == OBJ_COMMIT) {
 327                 struct commit_list *parents;
 328                 struct commit *commit = (struct commit *)o;
 329                 if (o->flags & THEY_HAVE)
 330                         we_knew_they_have = 1;
 331                 else
 332                         o->flags |= THEY_HAVE;
 333                 if (!oldest_have || (commit->date < oldest_have))
 334                         oldest_have = commit->date;
 335                 for (parents = commit->parents;
 336                      parents;
 337                      parents = parents->next)
 338                         parents->item->object.flags |= THEY_HAVE;
 339         }
 340         if (!we_knew_they_have) {
 341                 add_object_array(o, NULL, have_obj);
 342                 return 1;
 343         }
 344         return 0;
 345 }
 346
 347 static int ok_to_give_up(const struct object_array *have_obj,
 348                          struct object_array *want_obj)
 349 {
 350         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 351
 352         if (!have_obj->nr)
 353                 return 0;
 354
 355         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 356                                             COMMON_KNOWN, oldest_have,
 357                                             min_generation);
 358 }
 359
 360 static int get_common_commits(struct object_array *have_obj,
 361                               struct object_array *want_obj)
 362 {
 363         struct object_id oid;
 364         char last_hex[GIT_MAX_HEXSZ + 1];
 365         int got_common = 0;
 366         int got_other = 0;
 367         int sent_ready = 0;
 368
 369         save_commit_buffer = 0;
 370
 371         for (;;) {
 372                 char *line = packet_read_line(0, NULL);
 373                 const char *arg;
 374
 375                 reset_timeout();
 376
 377                 if (!line) {
 378                         if (multi_ack == 2 && got_common
 379                             && !got_other && ok_to_give_up(have_obj, want_obj)) {
 380                                 sent_ready = 1;
 381                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 382                         }
 383                         if (have_obj->nr == 0 || multi_ack)
 384                                 packet_write_fmt(1, "NAK\n");
 385
 386                         if (no_done && sent_ready) {
 387                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 388                                 return 0;
 389                         }
 390                         if (stateless_rpc)
 391                                 exit(0);
 392                         got_common = 0;
 393                         got_other = 0;
 394                         continue;
 395                 }
 396                 if (skip_prefix(line, "have ", &arg)) {
 397                         switch (got_oid(arg, &oid, have_obj)) {
 398                         case -1: /* they have what we do not */
 399                                 got_other = 1;
 400                                 if (multi_ack && ok_to_give_up(have_obj, want_obj)) {
 401                                         const char *hex = oid_to_hex(&oid);
 402                                         if (multi_ack == 2) {
 403                                                 sent_ready = 1;
 404                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 405                                         } else
 406                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 407                                 }
 408                                 break;
 409                         default:
 410                                 got_common = 1;
 411                                 oid_to_hex_r(last_hex, &oid);
 412                                 if (multi_ack == 2)
 413                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 414                                 else if (multi_ack)
 415                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 416                                 else if (have_obj->nr == 1)
 417                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 418                                 break;
 419                         }
 420                         continue;
 421                 }
 422                 if (!strcmp(line, "done")) {
 423                         if (have_obj->nr > 0) {
 424                                 if (multi_ack)
 425                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 426                                 return 0;
 427                         }
 428                         packet_write_fmt(1, "NAK\n");
 429                         return -1;
 430                 }
 431                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 432         }
 433 }
 434
 435 static int is_our_ref(struct object *o)
 436 {
 437         int allow_hidden_ref = (allow_unadvertised_object_request &
 438                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 439         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 440 }
 441
 442 /*
 443  * on successful case, it's up to the caller to close cmd->out
 444  */
 445 static int do_reachable_revlist(struct child_process *cmd,
 446                                 struct object_array *src,
 447                                 struct object_array *reachable)
 448 {
 449         static const char *argv[] = {
 450                 "rev-list", "--stdin", NULL,
 451         };
 452         struct object *o;
 453         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 454         int i;
 455         const unsigned hexsz = the_hash_algo->hexsz;
 456
 457         cmd->argv = argv;
 458         cmd->git_cmd = 1;
 459         cmd->no_stderr = 1;
 460         cmd->in = -1;
 461         cmd->out = -1;
 462
 463         /*
 464          * If the next rev-list --stdin encounters an unknown commit,
 465          * it terminates, which will cause SIGPIPE in the write loop
 466          * below.
 467          */
 468         sigchain_push(SIGPIPE, SIG_IGN);
 469
 470         if (start_command(cmd))
 471                 goto error;
 472
 473         namebuf[0] = '^';
 474         namebuf[hexsz + 1] = '\n';
 475         for (i = get_max_object_index(); 0 < i; ) {
 476                 o = get_indexed_object(--i);
 477                 if (!o)
 478                         continue;
 479                 if (reachable && o->type == OBJ_COMMIT)
 480                         o->flags &= ~TMP_MARK;
 481                 if (!is_our_ref(o))
 482                         continue;
 483                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 484                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 485                         goto error;
 486         }
 487         namebuf[hexsz] = '\n';
 488         for (i = 0; i < src->nr; i++) {
 489                 o = src->objects[i].item;
 490                 if (is_our_ref(o)) {
 491                         if (reachable)
 492                                 add_object_array(o, NULL, reachable);
 493                         continue;
 494                 }
 495                 if (reachable && o->type == OBJ_COMMIT)
 496                         o->flags |= TMP_MARK;
 497                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 498                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 499                         goto error;
 500         }
 501         close(cmd->in);
 502         cmd->in = -1;
 503         sigchain_pop(SIGPIPE);
 504
 505         return 0;
 506
 507 error:
 508         sigchain_pop(SIGPIPE);
 509
 510         if (cmd->in >= 0)
 511                 close(cmd->in);
 512         if (cmd->out >= 0)
 513                 close(cmd->out);
 514         return -1;
 515 }
 516
 517 static int get_reachable_list(struct object_array *src,
 518                               struct object_array *reachable)
 519 {
 520         struct child_process cmd = CHILD_PROCESS_INIT;
 521         int i;
 522         struct object *o;
 523         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 524         const unsigned hexsz = the_hash_algo->hexsz;
 525
 526         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 527                 return -1;
 528
 529         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 530                 struct object_id sha1;
 531                 const char *p;
 532
 533                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 534                         break;
 535
 536                 o = lookup_object(the_repository, sha1.hash);
 537                 if (o && o->type == OBJ_COMMIT) {
 538                         o->flags &= ~TMP_MARK;
 539                 }
 540         }
 541         for (i = get_max_object_index(); 0 < i; i--) {
 542                 o = get_indexed_object(i - 1);
 543                 if (o && o->type == OBJ_COMMIT &&
 544                     (o->flags & TMP_MARK)) {
 545                         add_object_array(o, NULL, reachable);
 546                                 o->flags &= ~TMP_MARK;
 547                 }
 548         }
 549         close(cmd.out);
 550
 551         if (finish_command(&cmd))
 552                 return -1;
 553
 554         return 0;
 555 }
 556
 557 static int has_unreachable(struct object_array *src)
 558 {
 559         struct child_process cmd = CHILD_PROCESS_INIT;
 560         char buf[1];
 561         int i;
 562
 563         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 564                 return 1;
 565
 566         /*
 567          * The commits out of the rev-list are not ancestors of
 568          * our ref.
 569          */
 570         i = read_in_full(cmd.out, buf, 1);
 571         if (i)
 572                 goto error;
 573         close(cmd.out);
 574         cmd.out = -1;
 575
 576         /*
 577          * rev-list may have died by encountering a bad commit
 578          * in the history, in which case we do want to bail out
 579          * even when it showed no commit.
 580          */
 581         if (finish_command(&cmd))
 582                 goto error;
 583
 584         /* All the non-tip ones are ancestors of what we advertised */
 585         return 0;
 586
 587 error:
 588         sigchain_pop(SIGPIPE);
 589         if (cmd.out >= 0)
 590                 close(cmd.out);
 591         return 1;
 592 }
 593
 594 static void check_non_tip(struct object_array *want_obj)
 595 {
 596         int i;
 597
 598         /*
 599          * In the normal in-process case without
 600          * uploadpack.allowReachableSHA1InWant,
 601          * non-tip requests can never happen.
 602          */
 603         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 604                 goto error;
 605         if (!has_unreachable(want_obj))
 606                 /* All the non-tip ones are ancestors of what we advertised */
 607                 return;
 608
 609 error:
 610         /* Pick one of them (we know there at least is one) */
 611         for (i = 0; i < want_obj->nr; i++) {
 612                 struct object *o = want_obj->objects[i].item;
 613                 if (!is_our_ref(o))
 614                         die("git upload-pack: not our ref %s",
 615                             oid_to_hex(&o->oid));
 616         }
 617 }
 618
 619 static void send_shallow(struct commit_list *result)
 620 {
 621         while (result) {
 622                 struct object *object = &result->item->object;
 623                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 624                         packet_write_fmt(1, "shallow %s",
 625                                          oid_to_hex(&object->oid));
 626                         register_shallow(the_repository, &object->oid);
 627                         shallow_nr++;
 628                 }
 629                 result = result->next;
 630         }
 631 }
 632
 633 static void send_unshallow(const struct object_array *shallows,
 634                            struct object_array *want_obj)
 635 {
 636         int i;
 637
 638         for (i = 0; i < shallows->nr; i++) {
 639                 struct object *object = shallows->objects[i].item;
 640                 if (object->flags & NOT_SHALLOW) {
 641                         struct commit_list *parents;
 642                         packet_write_fmt(1, "unshallow %s",
 643                                          oid_to_hex(&object->oid));
 644                         object->flags &= ~CLIENT_SHALLOW;
 645                         /*
 646                          * We want to _register_ "object" as shallow, but we
 647                          * also need to traverse object's parents to deepen a
 648                          * shallow clone. Unregister it for now so we can
 649                          * parse and add the parents to the want list, then
 650                          * re-register it.
 651                          */
 652                         unregister_shallow(&object->oid);
 653                         object->parsed = 0;
 654                         parse_commit_or_die((struct commit *)object);
 655                         parents = ((struct commit *)object)->parents;
 656                         while (parents) {
 657                                 add_object_array(&parents->item->object,
 658                                                  NULL, want_obj);
 659                                 parents = parents->next;
 660                         }
 661                         add_object_array(object, NULL, &extra_edge_obj);
 662                 }
 663                 /* make sure commit traversal conforms to client */
 664                 register_shallow(the_repository, &object->oid);
 665         }
 666 }
 667
 668 static void deepen(int depth, int deepen_relative,
 669                    struct object_array *shallows, struct object_array *want_obj)
 670 {
 671         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 672                 int i;
 673
 674                 for (i = 0; i < shallows->nr; i++) {
 675                         struct object *object = shallows->objects[i].item;
 676                         object->flags |= NOT_SHALLOW;
 677                 }
 678         } else if (deepen_relative) {
 679                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 680                 struct commit_list *result;
 681
 682                 get_reachable_list(shallows, &reachable_shallows);
 683                 result = get_shallow_commits(&reachable_shallows,
 684                                              depth + 1,
 685                                              SHALLOW, NOT_SHALLOW);
 686                 send_shallow(result);
 687                 free_commit_list(result);
 688                 object_array_clear(&reachable_shallows);
 689         } else {
 690                 struct commit_list *result;
 691
 692                 result = get_shallow_commits(want_obj, depth,
 693                                              SHALLOW, NOT_SHALLOW);
 694                 send_shallow(result);
 695                 free_commit_list(result);
 696         }
 697
 698         send_unshallow(shallows, want_obj);
 699 }
 700
 701 static void deepen_by_rev_list(int ac, const char **av,
 702                                struct object_array *shallows,
 703                                struct object_array *want_obj)
 704 {
 705         struct commit_list *result;
 706
 707         close_commit_graph(the_repository);
 708         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 709         send_shallow(result);
 710         free_commit_list(result);
 711         send_unshallow(shallows, want_obj);
 712 }
 713
 714 /* Returns 1 if a shallow list is sent or 0 otherwise */
 715 static int send_shallow_list(int depth, int deepen_rev_list,
 716                              timestamp_t deepen_since,
 717                              struct string_list *deepen_not,
 718                              struct object_array *shallows,
 719                              struct object_array *want_obj)
 720 {
 721         int ret = 0;
 722
 723         if (depth > 0 && deepen_rev_list)
 724                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 725         if (depth > 0) {
 726                 deepen(depth, deepen_relative, shallows, want_obj);
 727                 ret = 1;
 728         } else if (deepen_rev_list) {
 729                 struct argv_array av = ARGV_ARRAY_INIT;
 730                 int i;
 731
 732                 argv_array_push(&av, "rev-list");
 733                 if (deepen_since)
 734                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 735                 if (deepen_not->nr) {
 736                         argv_array_push(&av, "--not");
 737                         for (i = 0; i < deepen_not->nr; i++) {
 738                                 struct string_list_item *s = deepen_not->items + i;
 739                                 argv_array_push(&av, s->string);
 740                         }
 741                         argv_array_push(&av, "--not");
 742                 }
 743                 for (i = 0; i < want_obj->nr; i++) {
 744                         struct object *o = want_obj->objects[i].item;
 745                         argv_array_push(&av, oid_to_hex(&o->oid));
 746                 }
 747                 deepen_by_rev_list(av.argc, av.argv, shallows, want_obj);
 748                 argv_array_clear(&av);
 749                 ret = 1;
 750         } else {
 751                 if (shallows->nr > 0) {
 752                         int i;
 753                         for (i = 0; i < shallows->nr; i++)
 754                                 register_shallow(the_repository,
 755                                                  &shallows->objects[i].item->oid);
 756                 }
 757         }
 758
 759         shallow_nr += shallows->nr;
 760         return ret;
 761 }
 762
 763 static int process_shallow(const char *line, struct object_array *shallows)
 764 {
 765         const char *arg;
 766         if (skip_prefix(line, "shallow ", &arg)) {
 767                 struct object_id oid;
 768                 struct object *object;
 769                 if (get_oid_hex(arg, &oid))
 770                         die("invalid shallow line: %s", line);
 771                 object = parse_object(the_repository, &oid);
 772                 if (!object)
 773                         return 1;
 774                 if (object->type != OBJ_COMMIT)
 775                         die("invalid shallow object %s", oid_to_hex(&oid));
 776                 if (!(object->flags & CLIENT_SHALLOW)) {
 777                         object->flags |= CLIENT_SHALLOW;
 778                         add_object_array(object, NULL, shallows);
 779                 }
 780                 return 1;
 781         }
 782
 783         return 0;
 784 }
 785
 786 static int process_deepen(const char *line, int *depth)
 787 {
 788         const char *arg;
 789         if (skip_prefix(line, "deepen ", &arg)) {
 790                 char *end = NULL;
 791                 *depth = (int)strtol(arg, &end, 0);
 792                 if (!end || *end || *depth <= 0)
 793                         die("Invalid deepen: %s", line);
 794                 return 1;
 795         }
 796
 797         return 0;
 798 }
 799
 800 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 801 {
 802         const char *arg;
 803         if (skip_prefix(line, "deepen-since ", &arg)) {
 804                 char *end = NULL;
 805                 *deepen_since = parse_timestamp(arg, &end, 0);
 806                 if (!end || *end || !deepen_since ||
 807                     /* revisions.c's max_age -1 is special */
 808                     *deepen_since == -1)
 809                         die("Invalid deepen-since: %s", line);
 810                 *deepen_rev_list = 1;
 811                 return 1;
 812         }
 813         return 0;
 814 }
 815
 816 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 817 {
 818         const char *arg;
 819         if (skip_prefix(line, "deepen-not ", &arg)) {
 820                 char *ref = NULL;
 821                 struct object_id oid;
 822                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 823                         die("git upload-pack: ambiguous deepen-not: %s", line);
 824                 string_list_append(deepen_not, ref);
 825                 free(ref);
 826                 *deepen_rev_list = 1;
 827                 return 1;
 828         }
 829         return 0;
 830 }
 831
 832 static void receive_needs(struct object_array *want_obj)
 833 {
 834         struct object_array shallows = OBJECT_ARRAY_INIT;
 835         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 836         int depth = 0;
 837         int has_non_tip = 0;
 838         timestamp_t deepen_since = 0;
 839         int deepen_rev_list = 0;
 840
 841         shallow_nr = 0;
 842         for (;;) {
 843                 struct object *o;
 844                 const char *features;
 845                 struct object_id oid_buf;
 846                 char *line = packet_read_line(0, NULL);
 847                 const char *arg;
 848
 849                 reset_timeout();
 850                 if (!line)
 851                         break;
 852
 853                 if (process_shallow(line, &shallows))
 854                         continue;
 855                 if (process_deepen(line, &depth))
 856                         continue;
 857                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 858                         continue;
 859                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 860                         continue;
 861
 862                 if (skip_prefix(line, "filter ", &arg)) {
 863                         if (!filter_capability_requested)
 864                                 die("git upload-pack: filtering capability not negotiated");
 865                         parse_list_objects_filter(&filter_options, arg);
 866                         continue;
 867                 }
 868
 869                 if (!skip_prefix(line, "want ", &arg) ||
 870                     parse_oid_hex(arg, &oid_buf, &features))
 871                         die("git upload-pack: protocol error, "
 872                             "expected to get object ID, not '%s'", line);
 873
 874                 if (parse_feature_request(features, "deepen-relative"))
 875                         deepen_relative = 1;
 876                 if (parse_feature_request(features, "multi_ack_detailed"))
 877                         multi_ack = 2;
 878                 else if (parse_feature_request(features, "multi_ack"))
 879                         multi_ack = 1;
 880                 if (parse_feature_request(features, "no-done"))
 881                         no_done = 1;
 882                 if (parse_feature_request(features, "thin-pack"))
 883                         use_thin_pack = 1;
 884                 if (parse_feature_request(features, "ofs-delta"))
 885                         use_ofs_delta = 1;
 886                 if (parse_feature_request(features, "side-band-64k"))
 887                         use_sideband = LARGE_PACKET_MAX;
 888                 else if (parse_feature_request(features, "side-band"))
 889                         use_sideband = DEFAULT_PACKET_MAX;
 890                 if (parse_feature_request(features, "no-progress"))
 891                         no_progress = 1;
 892                 if (parse_feature_request(features, "include-tag"))
 893                         use_include_tag = 1;
 894                 if (allow_filter && parse_feature_request(features, "filter"))
 895                         filter_capability_requested = 1;
 896
 897                 o = parse_object(the_repository, &oid_buf);
 898                 if (!o) {
 899                         packet_write_fmt(1,
 900                                          "ERR upload-pack: not our ref %s",
 901                                          oid_to_hex(&oid_buf));
 902                         die("git upload-pack: not our ref %s",
 903                             oid_to_hex(&oid_buf));
 904                 }
 905                 if (!(o->flags & WANTED)) {
 906                         o->flags |= WANTED;
 907                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 908                               || is_our_ref(o)))
 909                                 has_non_tip = 1;
 910                         add_object_array(o, NULL, want_obj);
 911                 }
 912         }
 913
 914         /*
 915          * We have sent all our refs already, and the other end
 916          * should have chosen out of them. When we are operating
 917          * in the stateless RPC mode, however, their choice may
 918          * have been based on the set of older refs advertised
 919          * by another process that handled the initial request.
 920          */
 921         if (has_non_tip)
 922                 check_non_tip(want_obj);
 923
 924         if (!use_sideband && daemon_mode)
 925                 no_progress = 1;
 926
 927         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 928                 return;
 929
 930         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 931                               &deepen_not, &shallows, want_obj))
 932                 packet_flush(1);
 933         object_array_clear(&shallows);
 934 }
 935
 936 /* return non-zero if the ref is hidden, otherwise 0 */
 937 static int mark_our_ref(const char *refname, const char *refname_full,
 938                         const struct object_id *oid)
 939 {
 940         struct object *o = lookup_unknown_object(oid->hash);
 941
 942         if (ref_is_hidden(refname, refname_full)) {
 943                 o->flags |= HIDDEN_REF;
 944                 return 1;
 945         }
 946         o->flags |= OUR_REF;
 947         return 0;
 948 }
 949
 950 static int check_ref(const char *refname_full, const struct object_id *oid,
 951                      int flag, void *cb_data)
 952 {
 953         const char *refname = strip_namespace(refname_full);
 954
 955         mark_our_ref(refname, refname_full, oid);
 956         return 0;
 957 }
 958
 959 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 960 {
 961         struct string_list_item *item;
 962
 963         if (!symref->nr)
 964                 return;
 965         for_each_string_list_item(item, symref)
 966                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 967 }
 968
 969 static int send_ref(const char *refname, const struct object_id *oid,
 970                     int flag, void *cb_data)
 971 {
 972         static const char *capabilities = "multi_ack thin-pack side-band"
 973                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 974                 " deepen-relative no-progress include-tag multi_ack_detailed";
 975         const char *refname_nons = strip_namespace(refname);
 976         struct object_id peeled;
 977
 978         if (mark_our_ref(refname_nons, refname, oid))
 979                 return 0;
 980
 981         if (capabilities) {
 982                 struct strbuf symref_info = STRBUF_INIT;
 983
 984                 format_symref_info(&symref_info, cb_data);
 985                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
 986                              oid_to_hex(oid), refname_nons,
 987                              0, capabilities,
 988                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 989                                      " allow-tip-sha1-in-want" : "",
 990                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 991                                      " allow-reachable-sha1-in-want" : "",
 992                              stateless_rpc ? " no-done" : "",
 993                              symref_info.buf,
 994                              allow_filter ? " filter" : "",
 995                              git_user_agent_sanitized());
 996                 strbuf_release(&symref_info);
 997         } else {
 998                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 999         }
1000         capabilities = NULL;
1001         if (!peel_ref(refname, &peeled))
1002                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1003         return 0;
1004 }
1005
1006 static int find_symref(const char *refname, const struct object_id *oid,
1007                        int flag, void *cb_data)
1008 {
1009         const char *symref_target;
1010         struct string_list_item *item;
1011
1012         if ((flag & REF_ISSYMREF) == 0)
1013                 return 0;
1014         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1015         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1016                 die("'%s' is a symref but it is not?", refname);
1017         item = string_list_append(cb_data, refname);
1018         item->util = xstrdup(symref_target);
1019         return 0;
1020 }
1021
1022 static int upload_pack_config(const char *var, const char *value, void *unused)
1023 {
1024         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1025                 if (git_config_bool(var, value))
1026                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1027                 else
1028                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1029         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1030                 if (git_config_bool(var, value))
1031                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1032                 else
1033                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1034         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1035                 if (git_config_bool(var, value))
1036                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1037                 else
1038                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1039         } else if (!strcmp("uploadpack.keepalive", var)) {
1040                 keepalive = git_config_int(var, value);
1041                 if (!keepalive)
1042                         keepalive = -1;
1043         } else if (!strcmp("uploadpack.allowfilter", var)) {
1044                 allow_filter = git_config_bool(var, value);
1045         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1046                 allow_ref_in_want = git_config_bool(var, value);
1047         }
1048
1049         if (current_config_scope() != CONFIG_SCOPE_REPO) {
1050                 if (!strcmp("uploadpack.packobjectshook", var))
1051                         return git_config_string(&pack_objects_hook, var, value);
1052         }
1053
1054         return parse_hide_refs_config(var, value, "uploadpack");
1055 }
1056
1057 void upload_pack(struct upload_pack_options *options)
1058 {
1059         struct string_list symref = STRING_LIST_INIT_DUP;
1060         struct object_array want_obj = OBJECT_ARRAY_INIT;
1061
1062         stateless_rpc = options->stateless_rpc;
1063         timeout = options->timeout;
1064         daemon_mode = options->daemon_mode;
1065
1066         git_config(upload_pack_config, NULL);
1067
1068         head_ref_namespaced(find_symref, &symref);
1069
1070         if (options->advertise_refs || !stateless_rpc) {
1071                 reset_timeout();
1072                 head_ref_namespaced(send_ref, &symref);
1073                 for_each_namespaced_ref(send_ref, &symref);
1074                 advertise_shallow_grafts(1);
1075                 packet_flush(1);
1076         } else {
1077                 head_ref_namespaced(check_ref, NULL);
1078                 for_each_namespaced_ref(check_ref, NULL);
1079         }
1080         string_list_clear(&symref, 1);
1081         if (options->advertise_refs)
1082                 return;
1083
1084         receive_needs(&want_obj);
1085         if (want_obj.nr) {
1086                 struct object_array have_obj = OBJECT_ARRAY_INIT;
1087                 get_common_commits(&have_obj, &want_obj);
1088                 create_pack_file(&have_obj, &want_obj);
1089         }
1090 }
1091
1092 struct upload_pack_data {
1093         struct object_array wants;
1094         struct string_list wanted_refs;
1095         struct oid_array haves;
1096
1097         struct object_array shallows;
1098         struct string_list deepen_not;
1099         int depth;
1100         timestamp_t deepen_since;
1101         int deepen_rev_list;
1102         int deepen_relative;
1103
1104         unsigned stateless_rpc : 1;
1105
1106         unsigned use_thin_pack : 1;
1107         unsigned use_ofs_delta : 1;
1108         unsigned no_progress : 1;
1109         unsigned use_include_tag : 1;
1110         unsigned done : 1;
1111 };
1112
1113 static void upload_pack_data_init(struct upload_pack_data *data)
1114 {
1115         struct object_array wants = OBJECT_ARRAY_INIT;
1116         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1117         struct oid_array haves = OID_ARRAY_INIT;
1118         struct object_array shallows = OBJECT_ARRAY_INIT;
1119         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1120
1121         memset(data, 0, sizeof(*data));
1122         data->wants = wants;
1123         data->wanted_refs = wanted_refs;
1124         data->haves = haves;
1125         data->shallows = shallows;
1126         data->deepen_not = deepen_not;
1127 }
1128
1129 static void upload_pack_data_clear(struct upload_pack_data *data)
1130 {
1131         object_array_clear(&data->wants);
1132         string_list_clear(&data->wanted_refs, 1);
1133         oid_array_clear(&data->haves);
1134         object_array_clear(&data->shallows);
1135         string_list_clear(&data->deepen_not, 0);
1136 }
1137
1138 static int parse_want(const char *line, struct object_array *want_obj)
1139 {
1140         const char *arg;
1141         if (skip_prefix(line, "want ", &arg)) {
1142                 struct object_id oid;
1143                 struct object *o;
1144
1145                 if (get_oid_hex(arg, &oid))
1146                         die("git upload-pack: protocol error, "
1147                             "expected to get oid, not '%s'", line);
1148
1149                 o = parse_object(the_repository, &oid);
1150                 if (!o) {
1151                         packet_write_fmt(1,
1152                                          "ERR upload-pack: not our ref %s",
1153                                          oid_to_hex(&oid));
1154                         die("git upload-pack: not our ref %s",
1155                             oid_to_hex(&oid));
1156                 }
1157
1158                 if (!(o->flags & WANTED)) {
1159                         o->flags |= WANTED;
1160                         add_object_array(o, NULL, want_obj);
1161                 }
1162
1163                 return 1;
1164         }
1165
1166         return 0;
1167 }
1168
1169 static int parse_want_ref(const char *line, struct string_list *wanted_refs,
1170                           struct object_array *want_obj)
1171 {
1172         const char *arg;
1173         if (skip_prefix(line, "want-ref ", &arg)) {
1174                 struct object_id oid;
1175                 struct string_list_item *item;
1176                 struct object *o;
1177
1178                 if (read_ref(arg, &oid)) {
1179                         packet_write_fmt(1, "ERR unknown ref %s", arg);
1180                         die("unknown ref %s", arg);
1181                 }
1182
1183                 item = string_list_append(wanted_refs, arg);
1184                 item->util = oiddup(&oid);
1185
1186                 o = parse_object_or_die(&oid, arg);
1187                 if (!(o->flags & WANTED)) {
1188                         o->flags |= WANTED;
1189                         add_object_array(o, NULL, want_obj);
1190                 }
1191
1192                 return 1;
1193         }
1194
1195         return 0;
1196 }
1197
1198 static int parse_have(const char *line, struct oid_array *haves)
1199 {
1200         const char *arg;
1201         if (skip_prefix(line, "have ", &arg)) {
1202                 struct object_id oid;
1203
1204                 if (get_oid_hex(arg, &oid))
1205                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1206                 oid_array_append(haves, &oid);
1207                 return 1;
1208         }
1209
1210         return 0;
1211 }
1212
1213 static void process_args(struct packet_reader *request,
1214                          struct upload_pack_data *data,
1215                          struct object_array *want_obj)
1216 {
1217         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1218                 const char *arg = request->line;
1219                 const char *p;
1220
1221                 /* process want */
1222                 if (parse_want(arg, want_obj))
1223                         continue;
1224                 if (allow_ref_in_want &&
1225                     parse_want_ref(arg, &data->wanted_refs, want_obj))
1226                         continue;
1227                 /* process have line */
1228                 if (parse_have(arg, &data->haves))
1229                         continue;
1230
1231                 /* process args like thin-pack */
1232                 if (!strcmp(arg, "thin-pack")) {
1233                         use_thin_pack = 1;
1234                         continue;
1235                 }
1236                 if (!strcmp(arg, "ofs-delta")) {
1237                         use_ofs_delta = 1;
1238                         continue;
1239                 }
1240                 if (!strcmp(arg, "no-progress")) {
1241                         no_progress = 1;
1242                         continue;
1243                 }
1244                 if (!strcmp(arg, "include-tag")) {
1245                         use_include_tag = 1;
1246                         continue;
1247                 }
1248                 if (!strcmp(arg, "done")) {
1249                         data->done = 1;
1250                         continue;
1251                 }
1252
1253                 /* Shallow related arguments */
1254                 if (process_shallow(arg, &data->shallows))
1255                         continue;
1256                 if (process_deepen(arg, &data->depth))
1257                         continue;
1258                 if (process_deepen_since(arg, &data->deepen_since,
1259                                          &data->deepen_rev_list))
1260                         continue;
1261                 if (process_deepen_not(arg, &data->deepen_not,
1262                                        &data->deepen_rev_list))
1263                         continue;
1264                 if (!strcmp(arg, "deepen-relative")) {
1265                         data->deepen_relative = 1;
1266                         continue;
1267                 }
1268
1269                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1270                         parse_list_objects_filter(&filter_options, p);
1271                         continue;
1272                 }
1273
1274                 /* ignore unknown lines maybe? */
1275                 die("unexpected line: '%s'", arg);
1276         }
1277 }
1278
1279 static int process_haves(struct oid_array *haves, struct oid_array *common,
1280                          struct object_array *have_obj)
1281 {
1282         int i;
1283
1284         /* Process haves */
1285         for (i = 0; i < haves->nr; i++) {
1286                 const struct object_id *oid = &haves->oid[i];
1287                 struct object *o;
1288                 int we_knew_they_have = 0;
1289
1290                 if (!has_object_file(oid))
1291                         continue;
1292
1293                 oid_array_append(common, oid);
1294
1295                 o = parse_object(the_repository, oid);
1296                 if (!o)
1297                         die("oops (%s)", oid_to_hex(oid));
1298                 if (o->type == OBJ_COMMIT) {
1299                         struct commit_list *parents;
1300                         struct commit *commit = (struct commit *)o;
1301                         if (o->flags & THEY_HAVE)
1302                                 we_knew_they_have = 1;
1303                         else
1304                                 o->flags |= THEY_HAVE;
1305                         if (!oldest_have || (commit->date < oldest_have))
1306                                 oldest_have = commit->date;
1307                         for (parents = commit->parents;
1308                              parents;
1309                              parents = parents->next)
1310                                 parents->item->object.flags |= THEY_HAVE;
1311                 }
1312                 if (!we_knew_they_have)
1313                         add_object_array(o, NULL, have_obj);
1314         }
1315
1316         return 0;
1317 }
1318
1319 static int send_acks(struct oid_array *acks, struct strbuf *response,
1320                      const struct object_array *have_obj,
1321                      struct object_array *want_obj)
1322 {
1323         int i;
1324
1325         packet_buf_write(response, "acknowledgments\n");
1326
1327         /* Send Acks */
1328         if (!acks->nr)
1329                 packet_buf_write(response, "NAK\n");
1330
1331         for (i = 0; i < acks->nr; i++) {
1332                 packet_buf_write(response, "ACK %s\n",
1333                                  oid_to_hex(&acks->oid[i]));
1334         }
1335
1336         if (ok_to_give_up(have_obj, want_obj)) {
1337                 /* Send Ready */
1338                 packet_buf_write(response, "ready\n");
1339                 return 1;
1340         }
1341
1342         return 0;
1343 }
1344
1345 static int process_haves_and_send_acks(struct upload_pack_data *data,
1346                                        struct object_array *have_obj,
1347                                        struct object_array *want_obj)
1348 {
1349         struct oid_array common = OID_ARRAY_INIT;
1350         struct strbuf response = STRBUF_INIT;
1351         int ret = 0;
1352
1353         process_haves(&data->haves, &common, have_obj);
1354         if (data->done) {
1355                 ret = 1;
1356         } else if (send_acks(&common, &response, have_obj, want_obj)) {
1357                 packet_buf_delim(&response);
1358                 ret = 1;
1359         } else {
1360                 /* Add Flush */
1361                 packet_buf_flush(&response);
1362                 ret = 0;
1363         }
1364
1365         /* Send response */
1366         write_or_die(1, response.buf, response.len);
1367         strbuf_release(&response);
1368
1369         oid_array_clear(&data->haves);
1370         oid_array_clear(&common);
1371         return ret;
1372 }
1373
1374 static void send_wanted_ref_info(struct upload_pack_data *data)
1375 {
1376         const struct string_list_item *item;
1377
1378         if (!data->wanted_refs.nr)
1379                 return;
1380
1381         packet_write_fmt(1, "wanted-refs\n");
1382
1383         for_each_string_list_item(item, &data->wanted_refs) {
1384                 packet_write_fmt(1, "%s %s\n",
1385                                  oid_to_hex(item->util),
1386                                  item->string);
1387         }
1388
1389         packet_delim(1);
1390 }
1391
1392 static void send_shallow_info(struct upload_pack_data *data,
1393                               struct object_array *want_obj)
1394 {
1395         /* No shallow info needs to be sent */
1396         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1397             !is_repository_shallow(the_repository))
1398                 return;
1399
1400         packet_write_fmt(1, "shallow-info\n");
1401
1402         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1403                                data->deepen_since, &data->deepen_not,
1404                                &data->shallows, want_obj) &&
1405             is_repository_shallow(the_repository))
1406                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows,
1407                        want_obj);
1408
1409         packet_delim(1);
1410 }
1411
1412 enum fetch_state {
1413         FETCH_PROCESS_ARGS = 0,
1414         FETCH_SEND_ACKS,
1415         FETCH_SEND_PACK,
1416         FETCH_DONE,
1417 };
1418
1419 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1420                    struct packet_reader *request)
1421 {
1422         enum fetch_state state = FETCH_PROCESS_ARGS;
1423         struct upload_pack_data data;
1424         struct object_array have_obj = OBJECT_ARRAY_INIT;
1425         struct object_array want_obj = OBJECT_ARRAY_INIT;
1426
1427         clear_object_flags(ALL_FLAGS);
1428
1429         git_config(upload_pack_config, NULL);
1430
1431         upload_pack_data_init(&data);
1432         use_sideband = LARGE_PACKET_MAX;
1433
1434         while (state != FETCH_DONE) {
1435                 switch (state) {
1436                 case FETCH_PROCESS_ARGS:
1437                         process_args(request, &data, &want_obj);
1438
1439                         if (!want_obj.nr) {
1440                                 /*
1441                                  * Request didn't contain any 'want' lines,
1442                                  * guess they didn't want anything.
1443                                  */
1444                                 state = FETCH_DONE;
1445                         } else if (data.haves.nr) {
1446                                 /*
1447                                  * Request had 'have' lines, so lets ACK them.
1448                                  */
1449                                 state = FETCH_SEND_ACKS;
1450                         } else {
1451                                 /*
1452                                  * Request had 'want's but no 'have's so we can
1453                                  * immedietly go to construct and send a pack.
1454                                  */
1455                                 state = FETCH_SEND_PACK;
1456                         }
1457                         break;
1458                 case FETCH_SEND_ACKS:
1459                         if (process_haves_and_send_acks(&data, &have_obj,
1460                                                         &want_obj))
1461                                 state = FETCH_SEND_PACK;
1462                         else
1463                                 state = FETCH_DONE;
1464                         break;
1465                 case FETCH_SEND_PACK:
1466                         send_wanted_ref_info(&data);
1467                         send_shallow_info(&data, &want_obj);
1468
1469                         packet_write_fmt(1, "packfile\n");
1470                         create_pack_file(&have_obj, &want_obj);
1471                         state = FETCH_DONE;
1472                         break;
1473                 case FETCH_DONE:
1474                         continue;
1475                 }
1476         }
1477
1478         upload_pack_data_clear(&data);
1479         object_array_clear(&have_obj);
1480         object_array_clear(&want_obj);
1481         return 0;
1482 }
1483
1484 int upload_pack_advertise(struct repository *r,
1485                           struct strbuf *value)
1486 {
1487         if (value) {
1488                 int allow_filter_value;
1489                 int allow_ref_in_want;
1490
1491                 strbuf_addstr(value, "shallow");
1492
1493                 if (!repo_config_get_bool(the_repository,
1494                                          "uploadpack.allowfilter",
1495                                          &allow_filter_value) &&
1496                     allow_filter_value)
1497                         strbuf_addstr(value, " filter");
1498
1499                 if (!repo_config_get_bool(the_repository,
1500                                          "uploadpack.allowrefinwant",
1501                                          &allow_ref_in_want) &&
1502                     allow_ref_in_want)
1503                         strbuf_addstr(value, " ref-in-want");
1504         }
1505
1506         return 1;
1507 }