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 #include "shallow.h"
  30
  31 /* Remember to update object flag allocation in object.h */
  32 #define THEY_HAVE       (1u << 11)
  33 #define OUR_REF         (1u << 12)
  34 #define WANTED          (1u << 13)
  35 #define COMMON_KNOWN    (1u << 14)
  36
  37 #define SHALLOW         (1u << 16)
  38 #define NOT_SHALLOW     (1u << 17)
  39 #define CLIENT_SHALLOW  (1u << 18)
  40 #define HIDDEN_REF      (1u << 19)
  41
  42 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
  43                 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
  44
  45 static timestamp_t oldest_have;
  46
  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 int allow_sideband_all;
  75
  76 static void reset_timeout(void)
  77 {
  78         alarm(timeout);
  79 }
  80
  81 static void send_client_data(int fd, const char *data, ssize_t sz)
  82 {
  83         if (use_sideband) {
  84                 send_sideband(1, fd, data, sz, use_sideband);
  85                 return;
  86         }
  87         if (fd == 3)
  88                 /* emergency quit */
  89                 fd = 2;
  90         if (fd == 2) {
  91                 /* XXX: are we happy to lose stuff here? */
  92                 xwrite(fd, data, sz);
  93                 return;
  94         }
  95         write_or_die(fd, data, sz);
  96 }
  97
  98 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  99 {
 100         FILE *fp = cb_data;
 101         if (graft->nr_parent == -1)
 102                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 103         return 0;
 104 }
 105
 106 static void create_pack_file(const struct object_array *have_obj,
 107                              const struct object_array *want_obj)
 108 {
 109         struct child_process pack_objects = CHILD_PROCESS_INIT;
 110         char data[8193], progress[128];
 111         char abort_msg[] = "aborting due to possible repository "
 112                 "corruption on the remote side.";
 113         int buffered = -1;
 114         ssize_t sz;
 115         int i;
 116         FILE *pipe_fd;
 117
 118         if (!pack_objects_hook)
 119                 pack_objects.git_cmd = 1;
 120         else {
 121                 argv_array_push(&pack_objects.args, pack_objects_hook);
 122                 argv_array_push(&pack_objects.args, "git");
 123                 pack_objects.use_shell = 1;
 124         }
 125
 126         if (shallow_nr) {
 127                 argv_array_push(&pack_objects.args, "--shallow-file");
 128                 argv_array_push(&pack_objects.args, "");
 129         }
 130         argv_array_push(&pack_objects.args, "pack-objects");
 131         argv_array_push(&pack_objects.args, "--revs");
 132         if (use_thin_pack)
 133                 argv_array_push(&pack_objects.args, "--thin");
 134
 135         argv_array_push(&pack_objects.args, "--stdout");
 136         if (shallow_nr)
 137                 argv_array_push(&pack_objects.args, "--shallow");
 138         if (!no_progress)
 139                 argv_array_push(&pack_objects.args, "--progress");
 140         if (use_ofs_delta)
 141                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 142         if (use_include_tag)
 143                 argv_array_push(&pack_objects.args, "--include-tag");
 144         if (filter_options.choice) {
 145                 const char *spec =
 146                         expand_list_objects_filter_spec(&filter_options);
 147                 if (pack_objects.use_shell) {
 148                         struct strbuf buf = STRBUF_INIT;
 149                         sq_quote_buf(&buf, spec);
 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                                          spec);
 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 oid;
 532                 const char *p;
 533
 534                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 535                         break;
 536
 537                 o = lookup_object(the_repository, &oid);
 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                           struct packet_writer *writer)
 597 {
 598         int i;
 599
 600         /*
 601          * In the normal in-process case without
 602          * uploadpack.allowReachableSHA1InWant,
 603          * non-tip requests can never happen.
 604          */
 605         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 606                 goto error;
 607         if (!has_unreachable(want_obj))
 608                 /* All the non-tip ones are ancestors of what we advertised */
 609                 return;
 610
 611 error:
 612         /* Pick one of them (we know there at least is one) */
 613         for (i = 0; i < want_obj->nr; i++) {
 614                 struct object *o = want_obj->objects[i].item;
 615                 if (!is_our_ref(o)) {
 616                         packet_writer_error(writer,
 617                                             "upload-pack: not our ref %s",
 618                                             oid_to_hex(&o->oid));
 619                         die("git upload-pack: not our ref %s",
 620                             oid_to_hex(&o->oid));
 621                 }
 622         }
 623 }
 624
 625 static void send_shallow(struct packet_writer *writer,
 626                          struct commit_list *result)
 627 {
 628         while (result) {
 629                 struct object *object = &result->item->object;
 630                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 631                         packet_writer_write(writer, "shallow %s",
 632                                             oid_to_hex(&object->oid));
 633                         register_shallow(the_repository, &object->oid);
 634                         shallow_nr++;
 635                 }
 636                 result = result->next;
 637         }
 638 }
 639
 640 static void send_unshallow(struct packet_writer *writer,
 641                            const struct object_array *shallows,
 642                            struct object_array *want_obj)
 643 {
 644         int i;
 645
 646         for (i = 0; i < shallows->nr; i++) {
 647                 struct object *object = shallows->objects[i].item;
 648                 if (object->flags & NOT_SHALLOW) {
 649                         struct commit_list *parents;
 650                         packet_writer_write(writer, "unshallow %s",
 651                                             oid_to_hex(&object->oid));
 652                         object->flags &= ~CLIENT_SHALLOW;
 653                         /*
 654                          * We want to _register_ "object" as shallow, but we
 655                          * also need to traverse object's parents to deepen a
 656                          * shallow clone. Unregister it for now so we can
 657                          * parse and add the parents to the want list, then
 658                          * re-register it.
 659                          */
 660                         unregister_shallow(&object->oid);
 661                         object->parsed = 0;
 662                         parse_commit_or_die((struct commit *)object);
 663                         parents = ((struct commit *)object)->parents;
 664                         while (parents) {
 665                                 add_object_array(&parents->item->object,
 666                                                  NULL, want_obj);
 667                                 parents = parents->next;
 668                         }
 669                         add_object_array(object, NULL, &extra_edge_obj);
 670                 }
 671                 /* make sure commit traversal conforms to client */
 672                 register_shallow(the_repository, &object->oid);
 673         }
 674 }
 675
 676 static int check_ref(const char *refname_full, const struct object_id *oid,
 677                      int flag, void *cb_data);
 678 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
 679                    struct object_array *shallows, struct object_array *want_obj)
 680 {
 681         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 682                 int i;
 683
 684                 for (i = 0; i < shallows->nr; i++) {
 685                         struct object *object = shallows->objects[i].item;
 686                         object->flags |= NOT_SHALLOW;
 687                 }
 688         } else if (deepen_relative) {
 689                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 690                 struct commit_list *result;
 691
 692                 /*
 693                  * Checking for reachable shallows requires that our refs be
 694                  * marked with OUR_REF.
 695                  */
 696                 head_ref_namespaced(check_ref, NULL);
 697                 for_each_namespaced_ref(check_ref, NULL);
 698
 699                 get_reachable_list(shallows, &reachable_shallows);
 700                 result = get_shallow_commits(&reachable_shallows,
 701                                              depth + 1,
 702                                              SHALLOW, NOT_SHALLOW);
 703                 send_shallow(writer, result);
 704                 free_commit_list(result);
 705                 object_array_clear(&reachable_shallows);
 706         } else {
 707                 struct commit_list *result;
 708
 709                 result = get_shallow_commits(want_obj, depth,
 710                                              SHALLOW, NOT_SHALLOW);
 711                 send_shallow(writer, result);
 712                 free_commit_list(result);
 713         }
 714
 715         send_unshallow(writer, shallows, want_obj);
 716 }
 717
 718 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
 719                                const char **av,
 720                                struct object_array *shallows,
 721                                struct object_array *want_obj)
 722 {
 723         struct commit_list *result;
 724
 725         disable_commit_graph(the_repository);
 726         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 727         send_shallow(writer, result);
 728         free_commit_list(result);
 729         send_unshallow(writer, shallows, want_obj);
 730 }
 731
 732 /* Returns 1 if a shallow list is sent or 0 otherwise */
 733 static int send_shallow_list(struct packet_writer *writer,
 734                              int depth, int deepen_rev_list,
 735                              timestamp_t deepen_since,
 736                              struct string_list *deepen_not,
 737                              int deepen_relative,
 738                              struct object_array *shallows,
 739                              struct object_array *want_obj)
 740 {
 741         int ret = 0;
 742
 743         if (depth > 0 && deepen_rev_list)
 744                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 745         if (depth > 0) {
 746                 deepen(writer, depth, deepen_relative, shallows, want_obj);
 747                 ret = 1;
 748         } else if (deepen_rev_list) {
 749                 struct argv_array av = ARGV_ARRAY_INIT;
 750                 int i;
 751
 752                 argv_array_push(&av, "rev-list");
 753                 if (deepen_since)
 754                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 755                 if (deepen_not->nr) {
 756                         argv_array_push(&av, "--not");
 757                         for (i = 0; i < deepen_not->nr; i++) {
 758                                 struct string_list_item *s = deepen_not->items + i;
 759                                 argv_array_push(&av, s->string);
 760                         }
 761                         argv_array_push(&av, "--not");
 762                 }
 763                 for (i = 0; i < want_obj->nr; i++) {
 764                         struct object *o = want_obj->objects[i].item;
 765                         argv_array_push(&av, oid_to_hex(&o->oid));
 766                 }
 767                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
 768                 argv_array_clear(&av);
 769                 ret = 1;
 770         } else {
 771                 if (shallows->nr > 0) {
 772                         int i;
 773                         for (i = 0; i < shallows->nr; i++)
 774                                 register_shallow(the_repository,
 775                                                  &shallows->objects[i].item->oid);
 776                 }
 777         }
 778
 779         shallow_nr += shallows->nr;
 780         return ret;
 781 }
 782
 783 static int process_shallow(const char *line, struct object_array *shallows)
 784 {
 785         const char *arg;
 786         if (skip_prefix(line, "shallow ", &arg)) {
 787                 struct object_id oid;
 788                 struct object *object;
 789                 if (get_oid_hex(arg, &oid))
 790                         die("invalid shallow line: %s", line);
 791                 object = parse_object(the_repository, &oid);
 792                 if (!object)
 793                         return 1;
 794                 if (object->type != OBJ_COMMIT)
 795                         die("invalid shallow object %s", oid_to_hex(&oid));
 796                 if (!(object->flags & CLIENT_SHALLOW)) {
 797                         object->flags |= CLIENT_SHALLOW;
 798                         add_object_array(object, NULL, shallows);
 799                 }
 800                 return 1;
 801         }
 802
 803         return 0;
 804 }
 805
 806 static int process_deepen(const char *line, int *depth)
 807 {
 808         const char *arg;
 809         if (skip_prefix(line, "deepen ", &arg)) {
 810                 char *end = NULL;
 811                 *depth = (int)strtol(arg, &end, 0);
 812                 if (!end || *end || *depth <= 0)
 813                         die("Invalid deepen: %s", line);
 814                 return 1;
 815         }
 816
 817         return 0;
 818 }
 819
 820 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 821 {
 822         const char *arg;
 823         if (skip_prefix(line, "deepen-since ", &arg)) {
 824                 char *end = NULL;
 825                 *deepen_since = parse_timestamp(arg, &end, 0);
 826                 if (!end || *end || !deepen_since ||
 827                     /* revisions.c's max_age -1 is special */
 828                     *deepen_since == -1)
 829                         die("Invalid deepen-since: %s", line);
 830                 *deepen_rev_list = 1;
 831                 return 1;
 832         }
 833         return 0;
 834 }
 835
 836 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 837 {
 838         const char *arg;
 839         if (skip_prefix(line, "deepen-not ", &arg)) {
 840                 char *ref = NULL;
 841                 struct object_id oid;
 842                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 843                         die("git upload-pack: ambiguous deepen-not: %s", line);
 844                 string_list_append(deepen_not, ref);
 845                 free(ref);
 846                 *deepen_rev_list = 1;
 847                 return 1;
 848         }
 849         return 0;
 850 }
 851
 852 static void receive_needs(struct packet_reader *reader, struct object_array *want_obj)
 853 {
 854         struct object_array shallows = OBJECT_ARRAY_INIT;
 855         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 856         int depth = 0;
 857         int has_non_tip = 0;
 858         timestamp_t deepen_since = 0;
 859         int deepen_rev_list = 0;
 860         int deepen_relative = 0;
 861         struct packet_writer writer;
 862
 863         shallow_nr = 0;
 864         packet_writer_init(&writer, 1);
 865         for (;;) {
 866                 struct object *o;
 867                 const char *features;
 868                 struct object_id oid_buf;
 869                 const char *arg;
 870
 871                 reset_timeout();
 872                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 873                         break;
 874
 875                 if (process_shallow(reader->line, &shallows))
 876                         continue;
 877                 if (process_deepen(reader->line, &depth))
 878                         continue;
 879                 if (process_deepen_since(reader->line, &deepen_since, &deepen_rev_list))
 880                         continue;
 881                 if (process_deepen_not(reader->line, &deepen_not, &deepen_rev_list))
 882                         continue;
 883
 884                 if (skip_prefix(reader->line, "filter ", &arg)) {
 885                         if (!filter_capability_requested)
 886                                 die("git upload-pack: filtering capability not negotiated");
 887                         list_objects_filter_die_if_populated(&filter_options);
 888                         parse_list_objects_filter(&filter_options, arg);
 889                         continue;
 890                 }
 891
 892                 if (!skip_prefix(reader->line, "want ", &arg) ||
 893                     parse_oid_hex(arg, &oid_buf, &features))
 894                         die("git upload-pack: protocol error, "
 895                             "expected to get object ID, not '%s'", reader->line);
 896
 897                 if (parse_feature_request(features, "deepen-relative"))
 898                         deepen_relative = 1;
 899                 if (parse_feature_request(features, "multi_ack_detailed"))
 900                         multi_ack = 2;
 901                 else if (parse_feature_request(features, "multi_ack"))
 902                         multi_ack = 1;
 903                 if (parse_feature_request(features, "no-done"))
 904                         no_done = 1;
 905                 if (parse_feature_request(features, "thin-pack"))
 906                         use_thin_pack = 1;
 907                 if (parse_feature_request(features, "ofs-delta"))
 908                         use_ofs_delta = 1;
 909                 if (parse_feature_request(features, "side-band-64k"))
 910                         use_sideband = LARGE_PACKET_MAX;
 911                 else if (parse_feature_request(features, "side-band"))
 912                         use_sideband = DEFAULT_PACKET_MAX;
 913                 if (parse_feature_request(features, "no-progress"))
 914                         no_progress = 1;
 915                 if (parse_feature_request(features, "include-tag"))
 916                         use_include_tag = 1;
 917                 if (allow_filter && parse_feature_request(features, "filter"))
 918                         filter_capability_requested = 1;
 919
 920                 o = parse_object(the_repository, &oid_buf);
 921                 if (!o) {
 922                         packet_writer_error(&writer,
 923                                             "upload-pack: not our ref %s",
 924                                             oid_to_hex(&oid_buf));
 925                         die("git upload-pack: not our ref %s",
 926                             oid_to_hex(&oid_buf));
 927                 }
 928                 if (!(o->flags & WANTED)) {
 929                         o->flags |= WANTED;
 930                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 931                               || is_our_ref(o)))
 932                                 has_non_tip = 1;
 933                         add_object_array(o, NULL, want_obj);
 934                 }
 935         }
 936
 937         /*
 938          * We have sent all our refs already, and the other end
 939          * should have chosen out of them. When we are operating
 940          * in the stateless RPC mode, however, their choice may
 941          * have been based on the set of older refs advertised
 942          * by another process that handled the initial request.
 943          */
 944         if (has_non_tip)
 945                 check_non_tip(want_obj, &writer);
 946
 947         if (!use_sideband && daemon_mode)
 948                 no_progress = 1;
 949
 950         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 951                 return;
 952
 953         if (send_shallow_list(&writer, depth, deepen_rev_list, deepen_since,
 954                               &deepen_not, deepen_relative, &shallows,
 955                               want_obj))
 956                 packet_flush(1);
 957         object_array_clear(&shallows);
 958 }
 959
 960 /* return non-zero if the ref is hidden, otherwise 0 */
 961 static int mark_our_ref(const char *refname, const char *refname_full,
 962                         const struct object_id *oid)
 963 {
 964         struct object *o = lookup_unknown_object(oid);
 965
 966         if (ref_is_hidden(refname, refname_full)) {
 967                 o->flags |= HIDDEN_REF;
 968                 return 1;
 969         }
 970         o->flags |= OUR_REF;
 971         return 0;
 972 }
 973
 974 static int check_ref(const char *refname_full, const struct object_id *oid,
 975                      int flag, void *cb_data)
 976 {
 977         const char *refname = strip_namespace(refname_full);
 978
 979         mark_our_ref(refname, refname_full, oid);
 980         return 0;
 981 }
 982
 983 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 984 {
 985         struct string_list_item *item;
 986
 987         if (!symref->nr)
 988                 return;
 989         for_each_string_list_item(item, symref)
 990                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 991 }
 992
 993 static int send_ref(const char *refname, const struct object_id *oid,
 994                     int flag, void *cb_data)
 995 {
 996         static const char *capabilities = "multi_ack thin-pack side-band"
 997                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 998                 " deepen-relative no-progress include-tag multi_ack_detailed";
 999         const char *refname_nons = strip_namespace(refname);
1000         struct object_id peeled;
1001
1002         if (mark_our_ref(refname_nons, refname, oid))
1003                 return 0;
1004
1005         if (capabilities) {
1006                 struct strbuf symref_info = STRBUF_INIT;
1007
1008                 format_symref_info(&symref_info, cb_data);
1009                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1010                              oid_to_hex(oid), refname_nons,
1011                              0, capabilities,
1012                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1013                                      " allow-tip-sha1-in-want" : "",
1014                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1015                                      " allow-reachable-sha1-in-want" : "",
1016                              stateless_rpc ? " no-done" : "",
1017                              symref_info.buf,
1018                              allow_filter ? " filter" : "",
1019                              git_user_agent_sanitized());
1020                 strbuf_release(&symref_info);
1021         } else {
1022                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1023         }
1024         capabilities = NULL;
1025         if (!peel_ref(refname, &peeled))
1026                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1027         return 0;
1028 }
1029
1030 static int find_symref(const char *refname, const struct object_id *oid,
1031                        int flag, void *cb_data)
1032 {
1033         const char *symref_target;
1034         struct string_list_item *item;
1035
1036         if ((flag & REF_ISSYMREF) == 0)
1037                 return 0;
1038         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1039         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1040                 die("'%s' is a symref but it is not?", refname);
1041         item = string_list_append(cb_data, strip_namespace(refname));
1042         item->util = xstrdup(strip_namespace(symref_target));
1043         return 0;
1044 }
1045
1046 static int upload_pack_config(const char *var, const char *value, void *unused)
1047 {
1048         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1049                 if (git_config_bool(var, value))
1050                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1051                 else
1052                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1053         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1054                 if (git_config_bool(var, value))
1055                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1056                 else
1057                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1058         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1059                 if (git_config_bool(var, value))
1060                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1061                 else
1062                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1063         } else if (!strcmp("uploadpack.keepalive", var)) {
1064                 keepalive = git_config_int(var, value);
1065                 if (!keepalive)
1066                         keepalive = -1;
1067         } else if (!strcmp("uploadpack.allowfilter", var)) {
1068                 allow_filter = git_config_bool(var, value);
1069         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1070                 allow_ref_in_want = git_config_bool(var, value);
1071         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1072                 allow_sideband_all = git_config_bool(var, value);
1073         } else if (!strcmp("core.precomposeunicode", var)) {
1074                 precomposed_unicode = git_config_bool(var, value);
1075         }
1076
1077         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1078         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1079                 if (!strcmp("uploadpack.packobjectshook", var))
1080                         return git_config_string(&pack_objects_hook, var, value);
1081         }
1082
1083         return parse_hide_refs_config(var, value, "uploadpack");
1084 }
1085
1086 void upload_pack(struct upload_pack_options *options)
1087 {
1088         struct string_list symref = STRING_LIST_INIT_DUP;
1089         struct object_array want_obj = OBJECT_ARRAY_INIT;
1090         struct packet_reader reader;
1091
1092         stateless_rpc = options->stateless_rpc;
1093         timeout = options->timeout;
1094         daemon_mode = options->daemon_mode;
1095
1096         git_config(upload_pack_config, NULL);
1097
1098         head_ref_namespaced(find_symref, &symref);
1099
1100         if (options->advertise_refs || !stateless_rpc) {
1101                 reset_timeout();
1102                 head_ref_namespaced(send_ref, &symref);
1103                 for_each_namespaced_ref(send_ref, &symref);
1104                 advertise_shallow_grafts(1);
1105                 packet_flush(1);
1106         } else {
1107                 head_ref_namespaced(check_ref, NULL);
1108                 for_each_namespaced_ref(check_ref, NULL);
1109         }
1110         string_list_clear(&symref, 1);
1111         if (options->advertise_refs)
1112                 return;
1113
1114         packet_reader_init(&reader, 0, NULL, 0,
1115                            PACKET_READ_CHOMP_NEWLINE |
1116                            PACKET_READ_DIE_ON_ERR_PACKET);
1117
1118         receive_needs(&reader, &want_obj);
1119         if (want_obj.nr) {
1120                 struct object_array have_obj = OBJECT_ARRAY_INIT;
1121                 get_common_commits(&reader, &have_obj, &want_obj);
1122                 create_pack_file(&have_obj, &want_obj);
1123         }
1124 }
1125
1126 struct upload_pack_data {
1127         struct object_array wants;
1128         struct string_list wanted_refs;
1129         struct oid_array haves;
1130
1131         struct object_array shallows;
1132         struct string_list deepen_not;
1133         int depth;
1134         timestamp_t deepen_since;
1135         int deepen_rev_list;
1136         int deepen_relative;
1137
1138         struct packet_writer writer;
1139
1140         unsigned stateless_rpc : 1;
1141
1142         unsigned use_thin_pack : 1;
1143         unsigned use_ofs_delta : 1;
1144         unsigned no_progress : 1;
1145         unsigned use_include_tag : 1;
1146         unsigned done : 1;
1147 };
1148
1149 static void upload_pack_data_init(struct upload_pack_data *data)
1150 {
1151         struct object_array wants = OBJECT_ARRAY_INIT;
1152         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1153         struct oid_array haves = OID_ARRAY_INIT;
1154         struct object_array shallows = OBJECT_ARRAY_INIT;
1155         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1156
1157         memset(data, 0, sizeof(*data));
1158         data->wants = wants;
1159         data->wanted_refs = wanted_refs;
1160         data->haves = haves;
1161         data->shallows = shallows;
1162         data->deepen_not = deepen_not;
1163         packet_writer_init(&data->writer, 1);
1164 }
1165
1166 static void upload_pack_data_clear(struct upload_pack_data *data)
1167 {
1168         object_array_clear(&data->wants);
1169         string_list_clear(&data->wanted_refs, 1);
1170         oid_array_clear(&data->haves);
1171         object_array_clear(&data->shallows);
1172         string_list_clear(&data->deepen_not, 0);
1173 }
1174
1175 static int parse_want(struct packet_writer *writer, const char *line,
1176                       struct object_array *want_obj)
1177 {
1178         const char *arg;
1179         if (skip_prefix(line, "want ", &arg)) {
1180                 struct object_id oid;
1181                 struct object *o;
1182
1183                 if (get_oid_hex(arg, &oid))
1184                         die("git upload-pack: protocol error, "
1185                             "expected to get oid, not '%s'", line);
1186
1187                 o = parse_object(the_repository, &oid);
1188                 if (!o) {
1189                         packet_writer_error(writer,
1190                                             "upload-pack: not our ref %s",
1191                                             oid_to_hex(&oid));
1192                         die("git upload-pack: not our ref %s",
1193                             oid_to_hex(&oid));
1194                 }
1195
1196                 if (!(o->flags & WANTED)) {
1197                         o->flags |= WANTED;
1198                         add_object_array(o, NULL, want_obj);
1199                 }
1200
1201                 return 1;
1202         }
1203
1204         return 0;
1205 }
1206
1207 static int parse_want_ref(struct packet_writer *writer, const char *line,
1208                           struct string_list *wanted_refs,
1209                           struct object_array *want_obj)
1210 {
1211         const char *arg;
1212         if (skip_prefix(line, "want-ref ", &arg)) {
1213                 struct object_id oid;
1214                 struct string_list_item *item;
1215                 struct object *o;
1216
1217                 if (read_ref(arg, &oid)) {
1218                         packet_writer_error(writer, "unknown ref %s", arg);
1219                         die("unknown ref %s", arg);
1220                 }
1221
1222                 item = string_list_append(wanted_refs, arg);
1223                 item->util = oiddup(&oid);
1224
1225                 o = parse_object_or_die(&oid, arg);
1226                 if (!(o->flags & WANTED)) {
1227                         o->flags |= WANTED;
1228                         add_object_array(o, NULL, want_obj);
1229                 }
1230
1231                 return 1;
1232         }
1233
1234         return 0;
1235 }
1236
1237 static int parse_have(const char *line, struct oid_array *haves)
1238 {
1239         const char *arg;
1240         if (skip_prefix(line, "have ", &arg)) {
1241                 struct object_id oid;
1242
1243                 if (get_oid_hex(arg, &oid))
1244                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1245                 oid_array_append(haves, &oid);
1246                 return 1;
1247         }
1248
1249         return 0;
1250 }
1251
1252 static void process_args(struct packet_reader *request,
1253                          struct upload_pack_data *data,
1254                          struct object_array *want_obj)
1255 {
1256         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1257                 const char *arg = request->line;
1258                 const char *p;
1259
1260                 /* process want */
1261                 if (parse_want(&data->writer, arg, want_obj))
1262                         continue;
1263                 if (allow_ref_in_want &&
1264                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1265                                    want_obj))
1266                         continue;
1267                 /* process have line */
1268                 if (parse_have(arg, &data->haves))
1269                         continue;
1270
1271                 /* process args like thin-pack */
1272                 if (!strcmp(arg, "thin-pack")) {
1273                         use_thin_pack = 1;
1274                         continue;
1275                 }
1276                 if (!strcmp(arg, "ofs-delta")) {
1277                         use_ofs_delta = 1;
1278                         continue;
1279                 }
1280                 if (!strcmp(arg, "no-progress")) {
1281                         no_progress = 1;
1282                         continue;
1283                 }
1284                 if (!strcmp(arg, "include-tag")) {
1285                         use_include_tag = 1;
1286                         continue;
1287                 }
1288                 if (!strcmp(arg, "done")) {
1289                         data->done = 1;
1290                         continue;
1291                 }
1292
1293                 /* Shallow related arguments */
1294                 if (process_shallow(arg, &data->shallows))
1295                         continue;
1296                 if (process_deepen(arg, &data->depth))
1297                         continue;
1298                 if (process_deepen_since(arg, &data->deepen_since,
1299                                          &data->deepen_rev_list))
1300                         continue;
1301                 if (process_deepen_not(arg, &data->deepen_not,
1302                                        &data->deepen_rev_list))
1303                         continue;
1304                 if (!strcmp(arg, "deepen-relative")) {
1305                         data->deepen_relative = 1;
1306                         continue;
1307                 }
1308
1309                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1310                         list_objects_filter_die_if_populated(&filter_options);
1311                         parse_list_objects_filter(&filter_options, p);
1312                         continue;
1313                 }
1314
1315                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1316                      allow_sideband_all) &&
1317                     !strcmp(arg, "sideband-all")) {
1318                         data->writer.use_sideband = 1;
1319                         continue;
1320                 }
1321
1322                 /* ignore unknown lines maybe? */
1323                 die("unexpected line: '%s'", arg);
1324         }
1325
1326         if (request->status != PACKET_READ_FLUSH)
1327                 die(_("expected flush after fetch arguments"));
1328 }
1329
1330 static int process_haves(struct oid_array *haves, struct oid_array *common,
1331                          struct object_array *have_obj)
1332 {
1333         int i;
1334
1335         /* Process haves */
1336         for (i = 0; i < haves->nr; i++) {
1337                 const struct object_id *oid = &haves->oid[i];
1338                 struct object *o;
1339                 int we_knew_they_have = 0;
1340
1341                 if (!has_object_file(oid))
1342                         continue;
1343
1344                 oid_array_append(common, oid);
1345
1346                 o = parse_object(the_repository, oid);
1347                 if (!o)
1348                         die("oops (%s)", oid_to_hex(oid));
1349                 if (o->type == OBJ_COMMIT) {
1350                         struct commit_list *parents;
1351                         struct commit *commit = (struct commit *)o;
1352                         if (o->flags & THEY_HAVE)
1353                                 we_knew_they_have = 1;
1354                         else
1355                                 o->flags |= THEY_HAVE;
1356                         if (!oldest_have || (commit->date < oldest_have))
1357                                 oldest_have = commit->date;
1358                         for (parents = commit->parents;
1359                              parents;
1360                              parents = parents->next)
1361                                 parents->item->object.flags |= THEY_HAVE;
1362                 }
1363                 if (!we_knew_they_have)
1364                         add_object_array(o, NULL, have_obj);
1365         }
1366
1367         return 0;
1368 }
1369
1370 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1371                      const struct object_array *have_obj,
1372                      struct object_array *want_obj)
1373 {
1374         int i;
1375
1376         packet_writer_write(writer, "acknowledgments\n");
1377
1378         /* Send Acks */
1379         if (!acks->nr)
1380                 packet_writer_write(writer, "NAK\n");
1381
1382         for (i = 0; i < acks->nr; i++) {
1383                 packet_writer_write(writer, "ACK %s\n",
1384                                     oid_to_hex(&acks->oid[i]));
1385         }
1386
1387         if (ok_to_give_up(have_obj, want_obj)) {
1388                 /* Send Ready */
1389                 packet_writer_write(writer, "ready\n");
1390                 return 1;
1391         }
1392
1393         return 0;
1394 }
1395
1396 static int process_haves_and_send_acks(struct upload_pack_data *data,
1397                                        struct object_array *have_obj,
1398                                        struct object_array *want_obj)
1399 {
1400         struct oid_array common = OID_ARRAY_INIT;
1401         int ret = 0;
1402
1403         process_haves(&data->haves, &common, have_obj);
1404         if (data->done) {
1405                 ret = 1;
1406         } else if (send_acks(&data->writer, &common, have_obj, want_obj)) {
1407                 packet_writer_delim(&data->writer);
1408                 ret = 1;
1409         } else {
1410                 /* Add Flush */
1411                 packet_writer_flush(&data->writer);
1412                 ret = 0;
1413         }
1414
1415         oid_array_clear(&data->haves);
1416         oid_array_clear(&common);
1417         return ret;
1418 }
1419
1420 static void send_wanted_ref_info(struct upload_pack_data *data)
1421 {
1422         const struct string_list_item *item;
1423
1424         if (!data->wanted_refs.nr)
1425                 return;
1426
1427         packet_writer_write(&data->writer, "wanted-refs\n");
1428
1429         for_each_string_list_item(item, &data->wanted_refs) {
1430                 packet_writer_write(&data->writer, "%s %s\n",
1431                                     oid_to_hex(item->util),
1432                                     item->string);
1433         }
1434
1435         packet_writer_delim(&data->writer);
1436 }
1437
1438 static void send_shallow_info(struct upload_pack_data *data,
1439                               struct object_array *want_obj)
1440 {
1441         /* No shallow info needs to be sent */
1442         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1443             !is_repository_shallow(the_repository))
1444                 return;
1445
1446         packet_writer_write(&data->writer, "shallow-info\n");
1447
1448         if (!send_shallow_list(&data->writer, data->depth,
1449                                data->deepen_rev_list,
1450                                data->deepen_since, &data->deepen_not,
1451                                data->deepen_relative,
1452                                &data->shallows, want_obj) &&
1453             is_repository_shallow(the_repository))
1454                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1455                        &data->shallows, want_obj);
1456
1457         packet_delim(1);
1458 }
1459
1460 enum fetch_state {
1461         FETCH_PROCESS_ARGS = 0,
1462         FETCH_SEND_ACKS,
1463         FETCH_SEND_PACK,
1464         FETCH_DONE,
1465 };
1466
1467 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1468                    struct packet_reader *request)
1469 {
1470         enum fetch_state state = FETCH_PROCESS_ARGS;
1471         struct upload_pack_data data;
1472         struct object_array have_obj = OBJECT_ARRAY_INIT;
1473         struct object_array want_obj = OBJECT_ARRAY_INIT;
1474
1475         clear_object_flags(ALL_FLAGS);
1476
1477         git_config(upload_pack_config, NULL);
1478
1479         upload_pack_data_init(&data);
1480         use_sideband = LARGE_PACKET_MAX;
1481
1482         while (state != FETCH_DONE) {
1483                 switch (state) {
1484                 case FETCH_PROCESS_ARGS:
1485                         process_args(request, &data, &want_obj);
1486
1487                         if (!want_obj.nr) {
1488                                 /*
1489                                  * Request didn't contain any 'want' lines,
1490                                  * guess they didn't want anything.
1491                                  */
1492                                 state = FETCH_DONE;
1493                         } else if (data.haves.nr) {
1494                                 /*
1495                                  * Request had 'have' lines, so lets ACK them.
1496                                  */
1497                                 state = FETCH_SEND_ACKS;
1498                         } else {
1499                                 /*
1500                                  * Request had 'want's but no 'have's so we can
1501                                  * immedietly go to construct and send a pack.
1502                                  */
1503                                 state = FETCH_SEND_PACK;
1504                         }
1505                         break;
1506                 case FETCH_SEND_ACKS:
1507                         if (process_haves_and_send_acks(&data, &have_obj,
1508                                                         &want_obj))
1509                                 state = FETCH_SEND_PACK;
1510                         else
1511                                 state = FETCH_DONE;
1512                         break;
1513                 case FETCH_SEND_PACK:
1514                         send_wanted_ref_info(&data);
1515                         send_shallow_info(&data, &want_obj);
1516
1517                         packet_writer_write(&data.writer, "packfile\n");
1518                         create_pack_file(&have_obj, &want_obj);
1519                         state = FETCH_DONE;
1520                         break;
1521                 case FETCH_DONE:
1522                         continue;
1523                 }
1524         }
1525
1526         upload_pack_data_clear(&data);
1527         object_array_clear(&have_obj);
1528         object_array_clear(&want_obj);
1529         return 0;
1530 }
1531
1532 int upload_pack_advertise(struct repository *r,
1533                           struct strbuf *value)
1534 {
1535         if (value) {
1536                 int allow_filter_value;
1537                 int allow_ref_in_want;
1538                 int allow_sideband_all_value;
1539
1540                 strbuf_addstr(value, "shallow");
1541
1542                 if (!repo_config_get_bool(the_repository,
1543                                          "uploadpack.allowfilter",
1544                                          &allow_filter_value) &&
1545                     allow_filter_value)
1546                         strbuf_addstr(value, " filter");
1547
1548                 if (!repo_config_get_bool(the_repository,
1549                                          "uploadpack.allowrefinwant",
1550                                          &allow_ref_in_want) &&
1551                     allow_ref_in_want)
1552                         strbuf_addstr(value, " ref-in-want");
1553
1554                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1555                     (!repo_config_get_bool(the_repository,
1556                                            "uploadpack.allowsidebandall",
1557                                            &allow_sideband_all_value) &&
1558                      allow_sideband_all_value))
1559                         strbuf_addstr(value, " sideband-all");
1560         }
1561
1562         return 1;
1563 }