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 multi_ack;
  47 static int no_done;
  48 static int use_thin_pack, use_ofs_delta, use_include_tag;
  49 static int no_progress, daemon_mode;
  50 /* Allow specifying sha1 if it is a ref tip. */
  51 #define ALLOW_TIP_SHA1  01
  52 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  53 #define ALLOW_REACHABLE_SHA1    02
  54 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  55 #define ALLOW_ANY_SHA1  07
  56 static unsigned int allow_unadvertised_object_request;
  57 static int shallow_nr;
  58 static struct object_array extra_edge_obj;
  59 static unsigned int timeout;
  60 static int keepalive = 5;
  61 /* 0 for no sideband,
  62  * otherwise maximum packet size (up to 65520 bytes).
  63  */
  64 static int use_sideband;
  65 static int stateless_rpc;
  66 static const char *pack_objects_hook;
  67
  68 static int filter_capability_requested;
  69 static int allow_filter;
  70 static int allow_ref_in_want;
  71 static struct list_objects_filter_options filter_options;
  72
  73 static int allow_sideband_all;
  74
  75 static void reset_timeout(void)
  76 {
  77         alarm(timeout);
  78 }
  79
  80 static void send_client_data(int fd, const char *data, ssize_t sz)
  81 {
  82         if (use_sideband) {
  83                 send_sideband(1, fd, data, sz, use_sideband);
  84                 return;
  85         }
  86         if (fd == 3)
  87                 /* emergency quit */
  88                 fd = 2;
  89         if (fd == 2) {
  90                 /* XXX: are we happy to lose stuff here? */
  91                 xwrite(fd, data, sz);
  92                 return;
  93         }
  94         write_or_die(fd, data, sz);
  95 }
  96
  97 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  98 {
  99         FILE *fp = cb_data;
 100         if (graft->nr_parent == -1)
 101                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 102         return 0;
 103 }
 104
 105 static void create_pack_file(const struct object_array *have_obj,
 106                              const struct object_array *want_obj)
 107 {
 108         struct child_process pack_objects = CHILD_PROCESS_INIT;
 109         char data[8193], progress[128];
 110         char abort_msg[] = "aborting due to possible repository "
 111                 "corruption on the remote side.";
 112         int buffered = -1;
 113         ssize_t sz;
 114         int i;
 115         FILE *pipe_fd;
 116
 117         if (!pack_objects_hook)
 118                 pack_objects.git_cmd = 1;
 119         else {
 120                 argv_array_push(&pack_objects.args, pack_objects_hook);
 121                 argv_array_push(&pack_objects.args, "git");
 122                 pack_objects.use_shell = 1;
 123         }
 124
 125         if (shallow_nr) {
 126                 argv_array_push(&pack_objects.args, "--shallow-file");
 127                 argv_array_push(&pack_objects.args, "");
 128         }
 129         argv_array_push(&pack_objects.args, "pack-objects");
 130         argv_array_push(&pack_objects.args, "--revs");
 131         if (use_thin_pack)
 132                 argv_array_push(&pack_objects.args, "--thin");
 133
 134         argv_array_push(&pack_objects.args, "--stdout");
 135         if (shallow_nr)
 136                 argv_array_push(&pack_objects.args, "--shallow");
 137         if (!no_progress)
 138                 argv_array_push(&pack_objects.args, "--progress");
 139         if (use_ofs_delta)
 140                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 141         if (use_include_tag)
 142                 argv_array_push(&pack_objects.args, "--include-tag");
 143         if (filter_options.filter_spec) {
 144                 struct strbuf expanded_filter_spec = STRBUF_INIT;
 145                 expand_list_objects_filter_spec(&filter_options,
 146                                                 &expanded_filter_spec);
 147                 if (pack_objects.use_shell) {
 148                         struct strbuf buf = STRBUF_INIT;
 149                         sq_quote_buf(&buf, expanded_filter_spec.buf);
 150                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 151                         strbuf_release(&buf);
 152                 } else {
 153                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 154                                          expanded_filter_spec.buf);
 155                 }
 156         }
 157
 158         pack_objects.in = -1;
 159         pack_objects.out = -1;
 160         pack_objects.err = -1;
 161
 162         if (start_command(&pack_objects))
 163                 die("git upload-pack: unable to fork git-pack-objects");
 164
 165         pipe_fd = xfdopen(pack_objects.in, "w");
 166
 167         if (shallow_nr)
 168                 for_each_commit_graft(write_one_shallow, pipe_fd);
 169
 170         for (i = 0; i < want_obj->nr; i++)
 171                 fprintf(pipe_fd, "%s\n",
 172                         oid_to_hex(&want_obj->objects[i].item->oid));
 173         fprintf(pipe_fd, "--not\n");
 174         for (i = 0; i < have_obj->nr; i++)
 175                 fprintf(pipe_fd, "%s\n",
 176                         oid_to_hex(&have_obj->objects[i].item->oid));
 177         for (i = 0; i < extra_edge_obj.nr; i++)
 178                 fprintf(pipe_fd, "%s\n",
 179                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 180         fprintf(pipe_fd, "\n");
 181         fflush(pipe_fd);
 182         fclose(pipe_fd);
 183
 184         /* We read from pack_objects.err to capture stderr output for
 185          * progress bar, and pack_objects.out to capture the pack data.
 186          */
 187
 188         while (1) {
 189                 struct pollfd pfd[2];
 190                 int pe, pu, pollsize;
 191                 int ret;
 192
 193                 reset_timeout();
 194
 195                 pollsize = 0;
 196                 pe = pu = -1;
 197
 198                 if (0 <= pack_objects.out) {
 199                         pfd[pollsize].fd = pack_objects.out;
 200                         pfd[pollsize].events = POLLIN;
 201                         pu = pollsize;
 202                         pollsize++;
 203                 }
 204                 if (0 <= pack_objects.err) {
 205                         pfd[pollsize].fd = pack_objects.err;
 206                         pfd[pollsize].events = POLLIN;
 207                         pe = pollsize;
 208                         pollsize++;
 209                 }
 210
 211                 if (!pollsize)
 212                         break;
 213
 214                 ret = poll(pfd, pollsize,
 215                         keepalive < 0 ? -1 : 1000 * keepalive);
 216
 217                 if (ret < 0) {
 218                         if (errno != EINTR) {
 219                                 error_errno("poll failed, resuming");
 220                                 sleep(1);
 221                         }
 222                         continue;
 223                 }
 224                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 225                         /* Status ready; we ship that in the side-band
 226                          * or dump to the standard error.
 227                          */
 228                         sz = xread(pack_objects.err, progress,
 229                                   sizeof(progress));
 230                         if (0 < sz)
 231                                 send_client_data(2, progress, sz);
 232                         else if (sz == 0) {
 233                                 close(pack_objects.err);
 234                                 pack_objects.err = -1;
 235                         }
 236                         else
 237                                 goto fail;
 238                         /* give priority to status messages */
 239                         continue;
 240                 }
 241                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 242                         /* Data ready; we keep the last byte to ourselves
 243                          * in case we detect broken rev-list, so that we
 244                          * can leave the stream corrupted.  This is
 245                          * unfortunate -- unpack-objects would happily
 246                          * accept a valid packdata with trailing garbage,
 247                          * so appending garbage after we pass all the
 248                          * pack data is not good enough to signal
 249                          * breakage to downstream.
 250                          */
 251                         char *cp = data;
 252                         ssize_t outsz = 0;
 253                         if (0 <= buffered) {
 254                                 *cp++ = buffered;
 255                                 outsz++;
 256                         }
 257                         sz = xread(pack_objects.out, cp,
 258                                   sizeof(data) - outsz);
 259                         if (0 < sz)
 260                                 ;
 261                         else if (sz == 0) {
 262                                 close(pack_objects.out);
 263                                 pack_objects.out = -1;
 264                         }
 265                         else
 266                                 goto fail;
 267                         sz += outsz;
 268                         if (1 < sz) {
 269                                 buffered = data[sz-1] & 0xFF;
 270                                 sz--;
 271                         }
 272                         else
 273                                 buffered = -1;
 274                         send_client_data(1, data, sz);
 275                 }
 276
 277                 /*
 278                  * We hit the keepalive timeout without saying anything; send
 279                  * an empty message on the data sideband just to let the other
 280                  * side know we're still working on it, but don't have any data
 281                  * yet.
 282                  *
 283                  * If we don't have a sideband channel, there's no room in the
 284                  * protocol to say anything, so those clients are just out of
 285                  * luck.
 286                  */
 287                 if (!ret && use_sideband) {
 288                         static const char buf[] = "0005\1";
 289                         write_or_die(1, buf, 5);
 290                 }
 291         }
 292
 293         if (finish_command(&pack_objects)) {
 294                 error("git upload-pack: git-pack-objects died with error.");
 295                 goto fail;
 296         }
 297
 298         /* flush the data */
 299         if (0 <= buffered) {
 300                 data[0] = buffered;
 301                 send_client_data(1, data, 1);
 302                 fprintf(stderr, "flushed.\n");
 303         }
 304         if (use_sideband)
 305                 packet_flush(1);
 306         return;
 307
 308  fail:
 309         send_client_data(3, abort_msg, sizeof(abort_msg));
 310         die("git upload-pack: %s", abort_msg);
 311 }
 312
 313 static int got_oid(const char *hex, struct object_id *oid,
 314                    struct object_array *have_obj)
 315 {
 316         struct object *o;
 317         int we_knew_they_have = 0;
 318
 319         if (get_oid_hex(hex, oid))
 320                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 321         if (!has_object_file(oid))
 322                 return -1;
 323
 324         o = parse_object(the_repository, oid);
 325         if (!o)
 326                 die("oops (%s)", oid_to_hex(oid));
 327         if (o->type == OBJ_COMMIT) {
 328                 struct commit_list *parents;
 329                 struct commit *commit = (struct commit *)o;
 330                 if (o->flags & THEY_HAVE)
 331                         we_knew_they_have = 1;
 332                 else
 333                         o->flags |= THEY_HAVE;
 334                 if (!oldest_have || (commit->date < oldest_have))
 335                         oldest_have = commit->date;
 336                 for (parents = commit->parents;
 337                      parents;
 338                      parents = parents->next)
 339                         parents->item->object.flags |= THEY_HAVE;
 340         }
 341         if (!we_knew_they_have) {
 342                 add_object_array(o, NULL, have_obj);
 343                 return 1;
 344         }
 345         return 0;
 346 }
 347
 348 static int ok_to_give_up(const struct object_array *have_obj,
 349                          struct object_array *want_obj)
 350 {
 351         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 352
 353         if (!have_obj->nr)
 354                 return 0;
 355
 356         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 357                                             COMMON_KNOWN, oldest_have,
 358                                             min_generation);
 359 }
 360
 361 static int get_common_commits(struct packet_reader *reader,
 362                               struct object_array *have_obj,
 363                               struct object_array *want_obj)
 364 {
 365         struct object_id oid;
 366         char last_hex[GIT_MAX_HEXSZ + 1];
 367         int got_common = 0;
 368         int got_other = 0;
 369         int sent_ready = 0;
 370
 371         save_commit_buffer = 0;
 372
 373         for (;;) {
 374                 const char *arg;
 375
 376                 reset_timeout();
 377
 378                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 379                         if (multi_ack == 2 && got_common
 380                             && !got_other && ok_to_give_up(have_obj, want_obj)) {
 381                                 sent_ready = 1;
 382                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 383                         }
 384                         if (have_obj->nr == 0 || multi_ack)
 385                                 packet_write_fmt(1, "NAK\n");
 386
 387                         if (no_done && sent_ready) {
 388                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 389                                 return 0;
 390                         }
 391                         if (stateless_rpc)
 392                                 exit(0);
 393                         got_common = 0;
 394                         got_other = 0;
 395                         continue;
 396                 }
 397                 if (skip_prefix(reader->line, "have ", &arg)) {
 398                         switch (got_oid(arg, &oid, have_obj)) {
 399                         case -1: /* they have what we do not */
 400                                 got_other = 1;
 401                                 if (multi_ack && ok_to_give_up(have_obj, want_obj)) {
 402                                         const char *hex = oid_to_hex(&oid);
 403                                         if (multi_ack == 2) {
 404                                                 sent_ready = 1;
 405                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 406                                         } else
 407                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 408                                 }
 409                                 break;
 410                         default:
 411                                 got_common = 1;
 412                                 oid_to_hex_r(last_hex, &oid);
 413                                 if (multi_ack == 2)
 414                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 415                                 else if (multi_ack)
 416                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 417                                 else if (have_obj->nr == 1)
 418                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 419                                 break;
 420                         }
 421                         continue;
 422                 }
 423                 if (!strcmp(reader->line, "done")) {
 424                         if (have_obj->nr > 0) {
 425                                 if (multi_ack)
 426                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 427                                 return 0;
 428                         }
 429                         packet_write_fmt(1, "NAK\n");
 430                         return -1;
 431                 }
 432                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 433         }
 434 }
 435
 436 static int is_our_ref(struct object *o)
 437 {
 438         int allow_hidden_ref = (allow_unadvertised_object_request &
 439                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 440         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 441 }
 442
 443 /*
 444  * on successful case, it's up to the caller to close cmd->out
 445  */
 446 static int do_reachable_revlist(struct child_process *cmd,
 447                                 struct object_array *src,
 448                                 struct object_array *reachable)
 449 {
 450         static const char *argv[] = {
 451                 "rev-list", "--stdin", NULL,
 452         };
 453         struct object *o;
 454         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 455         int i;
 456         const unsigned hexsz = the_hash_algo->hexsz;
 457
 458         cmd->argv = argv;
 459         cmd->git_cmd = 1;
 460         cmd->no_stderr = 1;
 461         cmd->in = -1;
 462         cmd->out = -1;
 463
 464         /*
 465          * If the next rev-list --stdin encounters an unknown commit,
 466          * it terminates, which will cause SIGPIPE in the write loop
 467          * below.
 468          */
 469         sigchain_push(SIGPIPE, SIG_IGN);
 470
 471         if (start_command(cmd))
 472                 goto error;
 473
 474         namebuf[0] = '^';
 475         namebuf[hexsz + 1] = '\n';
 476         for (i = get_max_object_index(); 0 < i; ) {
 477                 o = get_indexed_object(--i);
 478                 if (!o)
 479                         continue;
 480                 if (reachable && o->type == OBJ_COMMIT)
 481                         o->flags &= ~TMP_MARK;
 482                 if (!is_our_ref(o))
 483                         continue;
 484                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 485                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 486                         goto error;
 487         }
 488         namebuf[hexsz] = '\n';
 489         for (i = 0; i < src->nr; i++) {
 490                 o = src->objects[i].item;
 491                 if (is_our_ref(o)) {
 492                         if (reachable)
 493                                 add_object_array(o, NULL, reachable);
 494                         continue;
 495                 }
 496                 if (reachable && o->type == OBJ_COMMIT)
 497                         o->flags |= TMP_MARK;
 498                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 499                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 500                         goto error;
 501         }
 502         close(cmd->in);
 503         cmd->in = -1;
 504         sigchain_pop(SIGPIPE);
 505
 506         return 0;
 507
 508 error:
 509         sigchain_pop(SIGPIPE);
 510
 511         if (cmd->in >= 0)
 512                 close(cmd->in);
 513         if (cmd->out >= 0)
 514                 close(cmd->out);
 515         return -1;
 516 }
 517
 518 static int get_reachable_list(struct object_array *src,
 519                               struct object_array *reachable)
 520 {
 521         struct child_process cmd = CHILD_PROCESS_INIT;
 522         int i;
 523         struct object *o;
 524         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 525         const unsigned hexsz = the_hash_algo->hexsz;
 526
 527         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 528                 return -1;
 529
 530         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 531                 struct object_id sha1;
 532                 const char *p;
 533
 534                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 535                         break;
 536
 537                 o = lookup_object(the_repository, sha1.hash);
 538                 if (o && o->type == OBJ_COMMIT) {
 539                         o->flags &= ~TMP_MARK;
 540                 }
 541         }
 542         for (i = get_max_object_index(); 0 < i; i--) {
 543                 o = get_indexed_object(i - 1);
 544                 if (o && o->type == OBJ_COMMIT &&
 545                     (o->flags & TMP_MARK)) {
 546                         add_object_array(o, NULL, reachable);
 547                                 o->flags &= ~TMP_MARK;
 548                 }
 549         }
 550         close(cmd.out);
 551
 552         if (finish_command(&cmd))
 553                 return -1;
 554
 555         return 0;
 556 }
 557
 558 static int has_unreachable(struct object_array *src)
 559 {
 560         struct child_process cmd = CHILD_PROCESS_INIT;
 561         char buf[1];
 562         int i;
 563
 564         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 565                 return 1;
 566
 567         /*
 568          * The commits out of the rev-list are not ancestors of
 569          * our ref.
 570          */
 571         i = read_in_full(cmd.out, buf, 1);
 572         if (i)
 573                 goto error;
 574         close(cmd.out);
 575         cmd.out = -1;
 576
 577         /*
 578          * rev-list may have died by encountering a bad commit
 579          * in the history, in which case we do want to bail out
 580          * even when it showed no commit.
 581          */
 582         if (finish_command(&cmd))
 583                 goto error;
 584
 585         /* All the non-tip ones are ancestors of what we advertised */
 586         return 0;
 587
 588 error:
 589         sigchain_pop(SIGPIPE);
 590         if (cmd.out >= 0)
 591                 close(cmd.out);
 592         return 1;
 593 }
 594
 595 static void check_non_tip(struct object_array *want_obj)
 596 {
 597         int i;
 598
 599         /*
 600          * In the normal in-process case without
 601          * uploadpack.allowReachableSHA1InWant,
 602          * non-tip requests can never happen.
 603          */
 604         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 605                 goto error;
 606         if (!has_unreachable(want_obj))
 607                 /* All the non-tip ones are ancestors of what we advertised */
 608                 return;
 609
 610 error:
 611         /* Pick one of them (we know there at least is one) */
 612         for (i = 0; i < want_obj->nr; i++) {
 613                 struct object *o = want_obj->objects[i].item;
 614                 if (!is_our_ref(o))
 615                         die("git upload-pack: not our ref %s",
 616                             oid_to_hex(&o->oid));
 617         }
 618 }
 619
 620 static void send_shallow(struct packet_writer *writer,
 621                          struct commit_list *result)
 622 {
 623         while (result) {
 624                 struct object *object = &result->item->object;
 625                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 626                         packet_writer_write(writer, "shallow %s",
 627                                             oid_to_hex(&object->oid));
 628                         register_shallow(the_repository, &object->oid);
 629                         shallow_nr++;
 630                 }
 631                 result = result->next;
 632         }
 633 }
 634
 635 static void send_unshallow(struct packet_writer *writer,
 636                            const struct object_array *shallows,
 637                            struct object_array *want_obj)
 638 {
 639         int i;
 640
 641         for (i = 0; i < shallows->nr; i++) {
 642                 struct object *object = shallows->objects[i].item;
 643                 if (object->flags & NOT_SHALLOW) {
 644                         struct commit_list *parents;
 645                         packet_writer_write(writer, "unshallow %s",
 646                                             oid_to_hex(&object->oid));
 647                         object->flags &= ~CLIENT_SHALLOW;
 648                         /*
 649                          * We want to _register_ "object" as shallow, but we
 650                          * also need to traverse object's parents to deepen a
 651                          * shallow clone. Unregister it for now so we can
 652                          * parse and add the parents to the want list, then
 653                          * re-register it.
 654                          */
 655                         unregister_shallow(&object->oid);
 656                         object->parsed = 0;
 657                         parse_commit_or_die((struct commit *)object);
 658                         parents = ((struct commit *)object)->parents;
 659                         while (parents) {
 660                                 add_object_array(&parents->item->object,
 661                                                  NULL, want_obj);
 662                                 parents = parents->next;
 663                         }
 664                         add_object_array(object, NULL, &extra_edge_obj);
 665                 }
 666                 /* make sure commit traversal conforms to client */
 667                 register_shallow(the_repository, &object->oid);
 668         }
 669 }
 670
 671 static int check_ref(const char *refname_full, const struct object_id *oid,
 672                      int flag, void *cb_data);
 673 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
 674                    struct object_array *shallows, struct object_array *want_obj)
 675 {
 676         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 677                 int i;
 678
 679                 for (i = 0; i < shallows->nr; i++) {
 680                         struct object *object = shallows->objects[i].item;
 681                         object->flags |= NOT_SHALLOW;
 682                 }
 683         } else if (deepen_relative) {
 684                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 685                 struct commit_list *result;
 686
 687                 /*
 688                  * Checking for reachable shallows requires that our refs be
 689                  * marked with OUR_REF.
 690                  */
 691                 head_ref_namespaced(check_ref, NULL);
 692                 for_each_namespaced_ref(check_ref, NULL);
 693
 694                 get_reachable_list(shallows, &reachable_shallows);
 695                 result = get_shallow_commits(&reachable_shallows,
 696                                              depth + 1,
 697                                              SHALLOW, NOT_SHALLOW);
 698                 send_shallow(writer, result);
 699                 free_commit_list(result);
 700                 object_array_clear(&reachable_shallows);
 701         } else {
 702                 struct commit_list *result;
 703
 704                 result = get_shallow_commits(want_obj, depth,
 705                                              SHALLOW, NOT_SHALLOW);
 706                 send_shallow(writer, result);
 707                 free_commit_list(result);
 708         }
 709
 710         send_unshallow(writer, shallows, want_obj);
 711 }
 712
 713 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
 714                                const char **av,
 715                                struct object_array *shallows,
 716                                struct object_array *want_obj)
 717 {
 718         struct commit_list *result;
 719
 720         close_commit_graph(the_repository);
 721         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 722         send_shallow(writer, result);
 723         free_commit_list(result);
 724         send_unshallow(writer, shallows, want_obj);
 725 }
 726
 727 /* Returns 1 if a shallow list is sent or 0 otherwise */
 728 static int send_shallow_list(struct packet_writer *writer,
 729                              int depth, int deepen_rev_list,
 730                              timestamp_t deepen_since,
 731                              struct string_list *deepen_not,
 732                              int deepen_relative,
 733                              struct object_array *shallows,
 734                              struct object_array *want_obj)
 735 {
 736         int ret = 0;
 737
 738         if (depth > 0 && deepen_rev_list)
 739                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 740         if (depth > 0) {
 741                 deepen(writer, depth, deepen_relative, shallows, want_obj);
 742                 ret = 1;
 743         } else if (deepen_rev_list) {
 744                 struct argv_array av = ARGV_ARRAY_INIT;
 745                 int i;
 746
 747                 argv_array_push(&av, "rev-list");
 748                 if (deepen_since)
 749                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 750                 if (deepen_not->nr) {
 751                         argv_array_push(&av, "--not");
 752                         for (i = 0; i < deepen_not->nr; i++) {
 753                                 struct string_list_item *s = deepen_not->items + i;
 754                                 argv_array_push(&av, s->string);
 755                         }
 756                         argv_array_push(&av, "--not");
 757                 }
 758                 for (i = 0; i < want_obj->nr; i++) {
 759                         struct object *o = want_obj->objects[i].item;
 760                         argv_array_push(&av, oid_to_hex(&o->oid));
 761                 }
 762                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
 763                 argv_array_clear(&av);
 764                 ret = 1;
 765         } else {
 766                 if (shallows->nr > 0) {
 767                         int i;
 768                         for (i = 0; i < shallows->nr; i++)
 769                                 register_shallow(the_repository,
 770                                                  &shallows->objects[i].item->oid);
 771                 }
 772         }
 773
 774         shallow_nr += shallows->nr;
 775         return ret;
 776 }
 777
 778 static int process_shallow(const char *line, struct object_array *shallows)
 779 {
 780         const char *arg;
 781         if (skip_prefix(line, "shallow ", &arg)) {
 782                 struct object_id oid;
 783                 struct object *object;
 784                 if (get_oid_hex(arg, &oid))
 785                         die("invalid shallow line: %s", line);
 786                 object = parse_object(the_repository, &oid);
 787                 if (!object)
 788                         return 1;
 789                 if (object->type != OBJ_COMMIT)
 790                         die("invalid shallow object %s", oid_to_hex(&oid));
 791                 if (!(object->flags & CLIENT_SHALLOW)) {
 792                         object->flags |= CLIENT_SHALLOW;
 793                         add_object_array(object, NULL, shallows);
 794                 }
 795                 return 1;
 796         }
 797
 798         return 0;
 799 }
 800
 801 static int process_deepen(const char *line, int *depth)
 802 {
 803         const char *arg;
 804         if (skip_prefix(line, "deepen ", &arg)) {
 805                 char *end = NULL;
 806                 *depth = (int)strtol(arg, &end, 0);
 807                 if (!end || *end || *depth <= 0)
 808                         die("Invalid deepen: %s", line);
 809                 return 1;
 810         }
 811
 812         return 0;
 813 }
 814
 815 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 816 {
 817         const char *arg;
 818         if (skip_prefix(line, "deepen-since ", &arg)) {
 819                 char *end = NULL;
 820                 *deepen_since = parse_timestamp(arg, &end, 0);
 821                 if (!end || *end || !deepen_since ||
 822                     /* revisions.c's max_age -1 is special */
 823                     *deepen_since == -1)
 824                         die("Invalid deepen-since: %s", line);
 825                 *deepen_rev_list = 1;
 826                 return 1;
 827         }
 828         return 0;
 829 }
 830
 831 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 832 {
 833         const char *arg;
 834         if (skip_prefix(line, "deepen-not ", &arg)) {
 835                 char *ref = NULL;
 836                 struct object_id oid;
 837                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 838                         die("git upload-pack: ambiguous deepen-not: %s", line);
 839                 string_list_append(deepen_not, ref);
 840                 free(ref);
 841                 *deepen_rev_list = 1;
 842                 return 1;
 843         }
 844         return 0;
 845 }
 846
 847 static void receive_needs(struct packet_reader *reader, struct object_array *want_obj)
 848 {
 849         struct object_array shallows = OBJECT_ARRAY_INIT;
 850         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 851         int depth = 0;
 852         int has_non_tip = 0;
 853         timestamp_t deepen_since = 0;
 854         int deepen_rev_list = 0;
 855         int deepen_relative = 0;
 856         struct packet_writer writer;
 857
 858         shallow_nr = 0;
 859         packet_writer_init(&writer, 1);
 860         for (;;) {
 861                 struct object *o;
 862                 const char *features;
 863                 struct object_id oid_buf;
 864                 const char *arg;
 865
 866                 reset_timeout();
 867                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 868                         break;
 869
 870                 if (process_shallow(reader->line, &shallows))
 871                         continue;
 872                 if (process_deepen(reader->line, &depth))
 873                         continue;
 874                 if (process_deepen_since(reader->line, &deepen_since, &deepen_rev_list))
 875                         continue;
 876                 if (process_deepen_not(reader->line, &deepen_not, &deepen_rev_list))
 877                         continue;
 878
 879                 if (skip_prefix(reader->line, "filter ", &arg)) {
 880                         if (!filter_capability_requested)
 881                                 die("git upload-pack: filtering capability not negotiated");
 882                         parse_list_objects_filter(&filter_options, arg);
 883                         continue;
 884                 }
 885
 886                 if (!skip_prefix(reader->line, "want ", &arg) ||
 887                     parse_oid_hex(arg, &oid_buf, &features))
 888                         die("git upload-pack: protocol error, "
 889                             "expected to get object ID, not '%s'", reader->line);
 890
 891                 if (parse_feature_request(features, "deepen-relative"))
 892                         deepen_relative = 1;
 893                 if (parse_feature_request(features, "multi_ack_detailed"))
 894                         multi_ack = 2;
 895                 else if (parse_feature_request(features, "multi_ack"))
 896                         multi_ack = 1;
 897                 if (parse_feature_request(features, "no-done"))
 898                         no_done = 1;
 899                 if (parse_feature_request(features, "thin-pack"))
 900                         use_thin_pack = 1;
 901                 if (parse_feature_request(features, "ofs-delta"))
 902                         use_ofs_delta = 1;
 903                 if (parse_feature_request(features, "side-band-64k"))
 904                         use_sideband = LARGE_PACKET_MAX;
 905                 else if (parse_feature_request(features, "side-band"))
 906                         use_sideband = DEFAULT_PACKET_MAX;
 907                 if (parse_feature_request(features, "no-progress"))
 908                         no_progress = 1;
 909                 if (parse_feature_request(features, "include-tag"))
 910                         use_include_tag = 1;
 911                 if (allow_filter && parse_feature_request(features, "filter"))
 912                         filter_capability_requested = 1;
 913
 914                 o = parse_object(the_repository, &oid_buf);
 915                 if (!o) {
 916                         packet_writer_error(&writer,
 917                                             "upload-pack: not our ref %s",
 918                                             oid_to_hex(&oid_buf));
 919                         die("git upload-pack: not our ref %s",
 920                             oid_to_hex(&oid_buf));
 921                 }
 922                 if (!(o->flags & WANTED)) {
 923                         o->flags |= WANTED;
 924                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 925                               || is_our_ref(o)))
 926                                 has_non_tip = 1;
 927                         add_object_array(o, NULL, want_obj);
 928                 }
 929         }
 930
 931         /*
 932          * We have sent all our refs already, and the other end
 933          * should have chosen out of them. When we are operating
 934          * in the stateless RPC mode, however, their choice may
 935          * have been based on the set of older refs advertised
 936          * by another process that handled the initial request.
 937          */
 938         if (has_non_tip)
 939                 check_non_tip(want_obj);
 940
 941         if (!use_sideband && daemon_mode)
 942                 no_progress = 1;
 943
 944         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 945                 return;
 946
 947         if (send_shallow_list(&writer, depth, deepen_rev_list, deepen_since,
 948                               &deepen_not, deepen_relative, &shallows,
 949                               want_obj))
 950                 packet_flush(1);
 951         object_array_clear(&shallows);
 952 }
 953
 954 /* return non-zero if the ref is hidden, otherwise 0 */
 955 static int mark_our_ref(const char *refname, const char *refname_full,
 956                         const struct object_id *oid)
 957 {
 958         struct object *o = lookup_unknown_object(oid->hash);
 959
 960         if (ref_is_hidden(refname, refname_full)) {
 961                 o->flags |= HIDDEN_REF;
 962                 return 1;
 963         }
 964         o->flags |= OUR_REF;
 965         return 0;
 966 }
 967
 968 static int check_ref(const char *refname_full, const struct object_id *oid,
 969                      int flag, void *cb_data)
 970 {
 971         const char *refname = strip_namespace(refname_full);
 972
 973         mark_our_ref(refname, refname_full, oid);
 974         return 0;
 975 }
 976
 977 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 978 {
 979         struct string_list_item *item;
 980
 981         if (!symref->nr)
 982                 return;
 983         for_each_string_list_item(item, symref)
 984                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 985 }
 986
 987 static int send_ref(const char *refname, const struct object_id *oid,
 988                     int flag, void *cb_data)
 989 {
 990         static const char *capabilities = "multi_ack thin-pack side-band"
 991                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 992                 " deepen-relative no-progress include-tag multi_ack_detailed";
 993         const char *refname_nons = strip_namespace(refname);
 994         struct object_id peeled;
 995
 996         if (mark_our_ref(refname_nons, refname, oid))
 997                 return 0;
 998
 999         if (capabilities) {
1000                 struct strbuf symref_info = STRBUF_INIT;
1001
1002                 format_symref_info(&symref_info, cb_data);
1003                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1004                              oid_to_hex(oid), refname_nons,
1005                              0, capabilities,
1006                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1007                                      " allow-tip-sha1-in-want" : "",
1008                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1009                                      " allow-reachable-sha1-in-want" : "",
1010                              stateless_rpc ? " no-done" : "",
1011                              symref_info.buf,
1012                              allow_filter ? " filter" : "",
1013                              git_user_agent_sanitized());
1014                 strbuf_release(&symref_info);
1015         } else {
1016                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1017         }
1018         capabilities = NULL;
1019         if (!peel_ref(refname, &peeled))
1020                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1021         return 0;
1022 }
1023
1024 static int find_symref(const char *refname, const struct object_id *oid,
1025                        int flag, void *cb_data)
1026 {
1027         const char *symref_target;
1028         struct string_list_item *item;
1029
1030         if ((flag & REF_ISSYMREF) == 0)
1031                 return 0;
1032         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1033         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1034                 die("'%s' is a symref but it is not?", refname);
1035         item = string_list_append(cb_data, refname);
1036         item->util = xstrdup(symref_target);
1037         return 0;
1038 }
1039
1040 static int upload_pack_config(const char *var, const char *value, void *unused)
1041 {
1042         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1043                 if (git_config_bool(var, value))
1044                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1045                 else
1046                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1047         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1048                 if (git_config_bool(var, value))
1049                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1050                 else
1051                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1052         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1053                 if (git_config_bool(var, value))
1054                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1055                 else
1056                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1057         } else if (!strcmp("uploadpack.keepalive", var)) {
1058                 keepalive = git_config_int(var, value);
1059                 if (!keepalive)
1060                         keepalive = -1;
1061         } else if (!strcmp("uploadpack.allowfilter", var)) {
1062                 allow_filter = git_config_bool(var, value);
1063         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1064                 allow_ref_in_want = git_config_bool(var, value);
1065         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1066                 allow_sideband_all = git_config_bool(var, value);
1067         }
1068
1069         if (current_config_scope() != CONFIG_SCOPE_REPO) {
1070                 if (!strcmp("uploadpack.packobjectshook", var))
1071                         return git_config_string(&pack_objects_hook, var, value);
1072         }
1073
1074         return parse_hide_refs_config(var, value, "uploadpack");
1075 }
1076
1077 void upload_pack(struct upload_pack_options *options)
1078 {
1079         struct string_list symref = STRING_LIST_INIT_DUP;
1080         struct object_array want_obj = OBJECT_ARRAY_INIT;
1081         struct packet_reader reader;
1082
1083         stateless_rpc = options->stateless_rpc;
1084         timeout = options->timeout;
1085         daemon_mode = options->daemon_mode;
1086
1087         git_config(upload_pack_config, NULL);
1088
1089         head_ref_namespaced(find_symref, &symref);
1090
1091         if (options->advertise_refs || !stateless_rpc) {
1092                 reset_timeout();
1093                 head_ref_namespaced(send_ref, &symref);
1094                 for_each_namespaced_ref(send_ref, &symref);
1095                 advertise_shallow_grafts(1);
1096                 packet_flush(1);
1097         } else {
1098                 head_ref_namespaced(check_ref, NULL);
1099                 for_each_namespaced_ref(check_ref, NULL);
1100         }
1101         string_list_clear(&symref, 1);
1102         if (options->advertise_refs)
1103                 return;
1104
1105         packet_reader_init(&reader, 0, NULL, 0,
1106                            PACKET_READ_CHOMP_NEWLINE |
1107                            PACKET_READ_DIE_ON_ERR_PACKET);
1108
1109         receive_needs(&reader, &want_obj);
1110         if (want_obj.nr) {
1111                 struct object_array have_obj = OBJECT_ARRAY_INIT;
1112                 get_common_commits(&reader, &have_obj, &want_obj);
1113                 create_pack_file(&have_obj, &want_obj);
1114         }
1115 }
1116
1117 struct upload_pack_data {
1118         struct object_array wants;
1119         struct string_list wanted_refs;
1120         struct oid_array haves;
1121
1122         struct object_array shallows;
1123         struct string_list deepen_not;
1124         int depth;
1125         timestamp_t deepen_since;
1126         int deepen_rev_list;
1127         int deepen_relative;
1128
1129         struct packet_writer writer;
1130
1131         unsigned stateless_rpc : 1;
1132
1133         unsigned use_thin_pack : 1;
1134         unsigned use_ofs_delta : 1;
1135         unsigned no_progress : 1;
1136         unsigned use_include_tag : 1;
1137         unsigned done : 1;
1138 };
1139
1140 static void upload_pack_data_init(struct upload_pack_data *data)
1141 {
1142         struct object_array wants = OBJECT_ARRAY_INIT;
1143         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1144         struct oid_array haves = OID_ARRAY_INIT;
1145         struct object_array shallows = OBJECT_ARRAY_INIT;
1146         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1147
1148         memset(data, 0, sizeof(*data));
1149         data->wants = wants;
1150         data->wanted_refs = wanted_refs;
1151         data->haves = haves;
1152         data->shallows = shallows;
1153         data->deepen_not = deepen_not;
1154         packet_writer_init(&data->writer, 1);
1155 }
1156
1157 static void upload_pack_data_clear(struct upload_pack_data *data)
1158 {
1159         object_array_clear(&data->wants);
1160         string_list_clear(&data->wanted_refs, 1);
1161         oid_array_clear(&data->haves);
1162         object_array_clear(&data->shallows);
1163         string_list_clear(&data->deepen_not, 0);
1164 }
1165
1166 static int parse_want(struct packet_writer *writer, const char *line,
1167                       struct object_array *want_obj)
1168 {
1169         const char *arg;
1170         if (skip_prefix(line, "want ", &arg)) {
1171                 struct object_id oid;
1172                 struct object *o;
1173
1174                 if (get_oid_hex(arg, &oid))
1175                         die("git upload-pack: protocol error, "
1176                             "expected to get oid, not '%s'", line);
1177
1178                 o = parse_object(the_repository, &oid);
1179                 if (!o) {
1180                         packet_writer_error(writer,
1181                                             "upload-pack: not our ref %s",
1182                                             oid_to_hex(&oid));
1183                         die("git upload-pack: not our ref %s",
1184                             oid_to_hex(&oid));
1185                 }
1186
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_want_ref(struct packet_writer *writer, const char *line,
1199                           struct string_list *wanted_refs,
1200                           struct object_array *want_obj)
1201 {
1202         const char *arg;
1203         if (skip_prefix(line, "want-ref ", &arg)) {
1204                 struct object_id oid;
1205                 struct string_list_item *item;
1206                 struct object *o;
1207
1208                 if (read_ref(arg, &oid)) {
1209                         packet_writer_error(writer, "unknown ref %s", arg);
1210                         die("unknown ref %s", arg);
1211                 }
1212
1213                 item = string_list_append(wanted_refs, arg);
1214                 item->util = oiddup(&oid);
1215
1216                 o = parse_object_or_die(&oid, arg);
1217                 if (!(o->flags & WANTED)) {
1218                         o->flags |= WANTED;
1219                         add_object_array(o, NULL, want_obj);
1220                 }
1221
1222                 return 1;
1223         }
1224
1225         return 0;
1226 }
1227
1228 static int parse_have(const char *line, struct oid_array *haves)
1229 {
1230         const char *arg;
1231         if (skip_prefix(line, "have ", &arg)) {
1232                 struct object_id oid;
1233
1234                 if (get_oid_hex(arg, &oid))
1235                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1236                 oid_array_append(haves, &oid);
1237                 return 1;
1238         }
1239
1240         return 0;
1241 }
1242
1243 static void process_args(struct packet_reader *request,
1244                          struct upload_pack_data *data,
1245                          struct object_array *want_obj)
1246 {
1247         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1248                 const char *arg = request->line;
1249                 const char *p;
1250
1251                 /* process want */
1252                 if (parse_want(&data->writer, arg, want_obj))
1253                         continue;
1254                 if (allow_ref_in_want &&
1255                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1256                                    want_obj))
1257                         continue;
1258                 /* process have line */
1259                 if (parse_have(arg, &data->haves))
1260                         continue;
1261
1262                 /* process args like thin-pack */
1263                 if (!strcmp(arg, "thin-pack")) {
1264                         use_thin_pack = 1;
1265                         continue;
1266                 }
1267                 if (!strcmp(arg, "ofs-delta")) {
1268                         use_ofs_delta = 1;
1269                         continue;
1270                 }
1271                 if (!strcmp(arg, "no-progress")) {
1272                         no_progress = 1;
1273                         continue;
1274                 }
1275                 if (!strcmp(arg, "include-tag")) {
1276                         use_include_tag = 1;
1277                         continue;
1278                 }
1279                 if (!strcmp(arg, "done")) {
1280                         data->done = 1;
1281                         continue;
1282                 }
1283
1284                 /* Shallow related arguments */
1285                 if (process_shallow(arg, &data->shallows))
1286                         continue;
1287                 if (process_deepen(arg, &data->depth))
1288                         continue;
1289                 if (process_deepen_since(arg, &data->deepen_since,
1290                                          &data->deepen_rev_list))
1291                         continue;
1292                 if (process_deepen_not(arg, &data->deepen_not,
1293                                        &data->deepen_rev_list))
1294                         continue;
1295                 if (!strcmp(arg, "deepen-relative")) {
1296                         data->deepen_relative = 1;
1297                         continue;
1298                 }
1299
1300                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1301                         parse_list_objects_filter(&filter_options, p);
1302                         continue;
1303                 }
1304
1305                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1306                      allow_sideband_all) &&
1307                     !strcmp(arg, "sideband-all")) {
1308                         data->writer.use_sideband = 1;
1309                         continue;
1310                 }
1311
1312                 /* ignore unknown lines maybe? */
1313                 die("unexpected line: '%s'", arg);
1314         }
1315 }
1316
1317 static int process_haves(struct oid_array *haves, struct oid_array *common,
1318                          struct object_array *have_obj)
1319 {
1320         int i;
1321
1322         /* Process haves */
1323         for (i = 0; i < haves->nr; i++) {
1324                 const struct object_id *oid = &haves->oid[i];
1325                 struct object *o;
1326                 int we_knew_they_have = 0;
1327
1328                 if (!has_object_file(oid))
1329                         continue;
1330
1331                 oid_array_append(common, oid);
1332
1333                 o = parse_object(the_repository, oid);
1334                 if (!o)
1335                         die("oops (%s)", oid_to_hex(oid));
1336                 if (o->type == OBJ_COMMIT) {
1337                         struct commit_list *parents;
1338                         struct commit *commit = (struct commit *)o;
1339                         if (o->flags & THEY_HAVE)
1340                                 we_knew_they_have = 1;
1341                         else
1342                                 o->flags |= THEY_HAVE;
1343                         if (!oldest_have || (commit->date < oldest_have))
1344                                 oldest_have = commit->date;
1345                         for (parents = commit->parents;
1346                              parents;
1347                              parents = parents->next)
1348                                 parents->item->object.flags |= THEY_HAVE;
1349                 }
1350                 if (!we_knew_they_have)
1351                         add_object_array(o, NULL, have_obj);
1352         }
1353
1354         return 0;
1355 }
1356
1357 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1358                      const struct object_array *have_obj,
1359                      struct object_array *want_obj)
1360 {
1361         int i;
1362
1363         packet_writer_write(writer, "acknowledgments\n");
1364
1365         /* Send Acks */
1366         if (!acks->nr)
1367                 packet_writer_write(writer, "NAK\n");
1368
1369         for (i = 0; i < acks->nr; i++) {
1370                 packet_writer_write(writer, "ACK %s\n",
1371                                     oid_to_hex(&acks->oid[i]));
1372         }
1373
1374         if (ok_to_give_up(have_obj, want_obj)) {
1375                 /* Send Ready */
1376                 packet_writer_write(writer, "ready\n");
1377                 return 1;
1378         }
1379
1380         return 0;
1381 }
1382
1383 static int process_haves_and_send_acks(struct upload_pack_data *data,
1384                                        struct object_array *have_obj,
1385                                        struct object_array *want_obj)
1386 {
1387         struct oid_array common = OID_ARRAY_INIT;
1388         int ret = 0;
1389
1390         process_haves(&data->haves, &common, have_obj);
1391         if (data->done) {
1392                 ret = 1;
1393         } else if (send_acks(&data->writer, &common, have_obj, want_obj)) {
1394                 packet_writer_delim(&data->writer);
1395                 ret = 1;
1396         } else {
1397                 /* Add Flush */
1398                 packet_writer_flush(&data->writer);
1399                 ret = 0;
1400         }
1401
1402         oid_array_clear(&data->haves);
1403         oid_array_clear(&common);
1404         return ret;
1405 }
1406
1407 static void send_wanted_ref_info(struct upload_pack_data *data)
1408 {
1409         const struct string_list_item *item;
1410
1411         if (!data->wanted_refs.nr)
1412                 return;
1413
1414         packet_writer_write(&data->writer, "wanted-refs\n");
1415
1416         for_each_string_list_item(item, &data->wanted_refs) {
1417                 packet_writer_write(&data->writer, "%s %s\n",
1418                                     oid_to_hex(item->util),
1419                                     item->string);
1420         }
1421
1422         packet_writer_delim(&data->writer);
1423 }
1424
1425 static void send_shallow_info(struct upload_pack_data *data,
1426                               struct object_array *want_obj)
1427 {
1428         /* No shallow info needs to be sent */
1429         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1430             !is_repository_shallow(the_repository))
1431                 return;
1432
1433         packet_writer_write(&data->writer, "shallow-info\n");
1434
1435         if (!send_shallow_list(&data->writer, data->depth,
1436                                data->deepen_rev_list,
1437                                data->deepen_since, &data->deepen_not,
1438                                data->deepen_relative,
1439                                &data->shallows, want_obj) &&
1440             is_repository_shallow(the_repository))
1441                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1442                        &data->shallows, want_obj);
1443
1444         packet_delim(1);
1445 }
1446
1447 enum fetch_state {
1448         FETCH_PROCESS_ARGS = 0,
1449         FETCH_SEND_ACKS,
1450         FETCH_SEND_PACK,
1451         FETCH_DONE,
1452 };
1453
1454 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1455                    struct packet_reader *request)
1456 {
1457         enum fetch_state state = FETCH_PROCESS_ARGS;
1458         struct upload_pack_data data;
1459         struct object_array have_obj = OBJECT_ARRAY_INIT;
1460         struct object_array want_obj = OBJECT_ARRAY_INIT;
1461
1462         clear_object_flags(ALL_FLAGS);
1463
1464         git_config(upload_pack_config, NULL);
1465
1466         upload_pack_data_init(&data);
1467         use_sideband = LARGE_PACKET_MAX;
1468
1469         while (state != FETCH_DONE) {
1470                 switch (state) {
1471                 case FETCH_PROCESS_ARGS:
1472                         process_args(request, &data, &want_obj);
1473
1474                         if (!want_obj.nr) {
1475                                 /*
1476                                  * Request didn't contain any 'want' lines,
1477                                  * guess they didn't want anything.
1478                                  */
1479                                 state = FETCH_DONE;
1480                         } else if (data.haves.nr) {
1481                                 /*
1482                                  * Request had 'have' lines, so lets ACK them.
1483                                  */
1484                                 state = FETCH_SEND_ACKS;
1485                         } else {
1486                                 /*
1487                                  * Request had 'want's but no 'have's so we can
1488                                  * immedietly go to construct and send a pack.
1489                                  */
1490                                 state = FETCH_SEND_PACK;
1491                         }
1492                         break;
1493                 case FETCH_SEND_ACKS:
1494                         if (process_haves_and_send_acks(&data, &have_obj,
1495                                                         &want_obj))
1496                                 state = FETCH_SEND_PACK;
1497                         else
1498                                 state = FETCH_DONE;
1499                         break;
1500                 case FETCH_SEND_PACK:
1501                         send_wanted_ref_info(&data);
1502                         send_shallow_info(&data, &want_obj);
1503
1504                         packet_writer_write(&data.writer, "packfile\n");
1505                         create_pack_file(&have_obj, &want_obj);
1506                         state = FETCH_DONE;
1507                         break;
1508                 case FETCH_DONE:
1509                         continue;
1510                 }
1511         }
1512
1513         upload_pack_data_clear(&data);
1514         object_array_clear(&have_obj);
1515         object_array_clear(&want_obj);
1516         return 0;
1517 }
1518
1519 int upload_pack_advertise(struct repository *r,
1520                           struct strbuf *value)
1521 {
1522         if (value) {
1523                 int allow_filter_value;
1524                 int allow_ref_in_want;
1525                 int allow_sideband_all_value;
1526
1527                 strbuf_addstr(value, "shallow");
1528
1529                 if (!repo_config_get_bool(the_repository,
1530                                          "uploadpack.allowfilter",
1531                                          &allow_filter_value) &&
1532                     allow_filter_value)
1533                         strbuf_addstr(value, " filter");
1534
1535                 if (!repo_config_get_bool(the_repository,
1536                                          "uploadpack.allowrefinwant",
1537                                          &allow_ref_in_want) &&
1538                     allow_ref_in_want)
1539                         strbuf_addstr(value, " ref-in-want");
1540
1541                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1542                     (!repo_config_get_bool(the_repository,
1543                                            "uploadpack.allowsidebandall",
1544                                            &allow_sideband_all_value) &&
1545                      allow_sideband_all_value))
1546                         strbuf_addstr(value, " sideband-all");
1547         }
1548
1549         return 1;
1550 }