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 void reset_timeout(void)
  74 {
  75         alarm(timeout);
  76 }
  77
  78 static void send_client_data(int fd, const char *data, ssize_t sz)
  79 {
  80         if (use_sideband) {
  81                 send_sideband(1, fd, data, sz, use_sideband);
  82                 return;
  83         }
  84         if (fd == 3)
  85                 /* emergency quit */
  86                 fd = 2;
  87         if (fd == 2) {
  88                 /* XXX: are we happy to lose stuff here? */
  89                 xwrite(fd, data, sz);
  90                 return;
  91         }
  92         write_or_die(fd, data, sz);
  93 }
  94
  95 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  96 {
  97         FILE *fp = cb_data;
  98         if (graft->nr_parent == -1)
  99                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 100         return 0;
 101 }
 102
 103 static void create_pack_file(const struct object_array *have_obj,
 104                              const struct object_array *want_obj)
 105 {
 106         struct child_process pack_objects = CHILD_PROCESS_INIT;
 107         char data[8193], progress[128];
 108         char abort_msg[] = "aborting due to possible repository "
 109                 "corruption on the remote side.";
 110         int buffered = -1;
 111         ssize_t sz;
 112         int i;
 113         FILE *pipe_fd;
 114
 115         if (!pack_objects_hook)
 116                 pack_objects.git_cmd = 1;
 117         else {
 118                 argv_array_push(&pack_objects.args, pack_objects_hook);
 119                 argv_array_push(&pack_objects.args, "git");
 120                 pack_objects.use_shell = 1;
 121         }
 122
 123         if (shallow_nr) {
 124                 argv_array_push(&pack_objects.args, "--shallow-file");
 125                 argv_array_push(&pack_objects.args, "");
 126         }
 127         argv_array_push(&pack_objects.args, "pack-objects");
 128         argv_array_push(&pack_objects.args, "--revs");
 129         if (use_thin_pack)
 130                 argv_array_push(&pack_objects.args, "--thin");
 131
 132         argv_array_push(&pack_objects.args, "--stdout");
 133         if (shallow_nr)
 134                 argv_array_push(&pack_objects.args, "--shallow");
 135         if (!no_progress)
 136                 argv_array_push(&pack_objects.args, "--progress");
 137         if (use_ofs_delta)
 138                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 139         if (use_include_tag)
 140                 argv_array_push(&pack_objects.args, "--include-tag");
 141         if (filter_options.filter_spec) {
 142                 if (pack_objects.use_shell) {
 143                         struct strbuf buf = STRBUF_INIT;
 144                         sq_quote_buf(&buf, filter_options.filter_spec);
 145                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 146                         strbuf_release(&buf);
 147                 } else {
 148                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 149                                          filter_options.filter_spec);
 150                 }
 151         }
 152
 153         pack_objects.in = -1;
 154         pack_objects.out = -1;
 155         pack_objects.err = -1;
 156
 157         if (start_command(&pack_objects))
 158                 die("git upload-pack: unable to fork git-pack-objects");
 159
 160         pipe_fd = xfdopen(pack_objects.in, "w");
 161
 162         if (shallow_nr)
 163                 for_each_commit_graft(write_one_shallow, pipe_fd);
 164
 165         for (i = 0; i < want_obj->nr; i++)
 166                 fprintf(pipe_fd, "%s\n",
 167                         oid_to_hex(&want_obj->objects[i].item->oid));
 168         fprintf(pipe_fd, "--not\n");
 169         for (i = 0; i < have_obj->nr; i++)
 170                 fprintf(pipe_fd, "%s\n",
 171                         oid_to_hex(&have_obj->objects[i].item->oid));
 172         for (i = 0; i < extra_edge_obj.nr; i++)
 173                 fprintf(pipe_fd, "%s\n",
 174                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 175         fprintf(pipe_fd, "\n");
 176         fflush(pipe_fd);
 177         fclose(pipe_fd);
 178
 179         /* We read from pack_objects.err to capture stderr output for
 180          * progress bar, and pack_objects.out to capture the pack data.
 181          */
 182
 183         while (1) {
 184                 struct pollfd pfd[2];
 185                 int pe, pu, pollsize;
 186                 int ret;
 187
 188                 reset_timeout();
 189
 190                 pollsize = 0;
 191                 pe = pu = -1;
 192
 193                 if (0 <= pack_objects.out) {
 194                         pfd[pollsize].fd = pack_objects.out;
 195                         pfd[pollsize].events = POLLIN;
 196                         pu = pollsize;
 197                         pollsize++;
 198                 }
 199                 if (0 <= pack_objects.err) {
 200                         pfd[pollsize].fd = pack_objects.err;
 201                         pfd[pollsize].events = POLLIN;
 202                         pe = pollsize;
 203                         pollsize++;
 204                 }
 205
 206                 if (!pollsize)
 207                         break;
 208
 209                 ret = poll(pfd, pollsize,
 210                         keepalive < 0 ? -1 : 1000 * keepalive);
 211
 212                 if (ret < 0) {
 213                         if (errno != EINTR) {
 214                                 error_errno("poll failed, resuming");
 215                                 sleep(1);
 216                         }
 217                         continue;
 218                 }
 219                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 220                         /* Status ready; we ship that in the side-band
 221                          * or dump to the standard error.
 222                          */
 223                         sz = xread(pack_objects.err, progress,
 224                                   sizeof(progress));
 225                         if (0 < sz)
 226                                 send_client_data(2, progress, sz);
 227                         else if (sz == 0) {
 228                                 close(pack_objects.err);
 229                                 pack_objects.err = -1;
 230                         }
 231                         else
 232                                 goto fail;
 233                         /* give priority to status messages */
 234                         continue;
 235                 }
 236                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 237                         /* Data ready; we keep the last byte to ourselves
 238                          * in case we detect broken rev-list, so that we
 239                          * can leave the stream corrupted.  This is
 240                          * unfortunate -- unpack-objects would happily
 241                          * accept a valid packdata with trailing garbage,
 242                          * so appending garbage after we pass all the
 243                          * pack data is not good enough to signal
 244                          * breakage to downstream.
 245                          */
 246                         char *cp = data;
 247                         ssize_t outsz = 0;
 248                         if (0 <= buffered) {
 249                                 *cp++ = buffered;
 250                                 outsz++;
 251                         }
 252                         sz = xread(pack_objects.out, cp,
 253                                   sizeof(data) - outsz);
 254                         if (0 < sz)
 255                                 ;
 256                         else if (sz == 0) {
 257                                 close(pack_objects.out);
 258                                 pack_objects.out = -1;
 259                         }
 260                         else
 261                                 goto fail;
 262                         sz += outsz;
 263                         if (1 < sz) {
 264                                 buffered = data[sz-1] & 0xFF;
 265                                 sz--;
 266                         }
 267                         else
 268                                 buffered = -1;
 269                         send_client_data(1, data, sz);
 270                 }
 271
 272                 /*
 273                  * We hit the keepalive timeout without saying anything; send
 274                  * an empty message on the data sideband just to let the other
 275                  * side know we're still working on it, but don't have any data
 276                  * yet.
 277                  *
 278                  * If we don't have a sideband channel, there's no room in the
 279                  * protocol to say anything, so those clients are just out of
 280                  * luck.
 281                  */
 282                 if (!ret && use_sideband) {
 283                         static const char buf[] = "0005\1";
 284                         write_or_die(1, buf, 5);
 285                 }
 286         }
 287
 288         if (finish_command(&pack_objects)) {
 289                 error("git upload-pack: git-pack-objects died with error.");
 290                 goto fail;
 291         }
 292
 293         /* flush the data */
 294         if (0 <= buffered) {
 295                 data[0] = buffered;
 296                 send_client_data(1, data, 1);
 297                 fprintf(stderr, "flushed.\n");
 298         }
 299         if (use_sideband)
 300                 packet_flush(1);
 301         return;
 302
 303  fail:
 304         send_client_data(3, abort_msg, sizeof(abort_msg));
 305         die("git upload-pack: %s", abort_msg);
 306 }
 307
 308 static int got_oid(const char *hex, struct object_id *oid,
 309                    struct object_array *have_obj)
 310 {
 311         struct object *o;
 312         int we_knew_they_have = 0;
 313
 314         if (get_oid_hex(hex, oid))
 315                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 316         if (!has_object_file(oid))
 317                 return -1;
 318
 319         o = parse_object(the_repository, oid);
 320         if (!o)
 321                 die("oops (%s)", oid_to_hex(oid));
 322         if (o->type == OBJ_COMMIT) {
 323                 struct commit_list *parents;
 324                 struct commit *commit = (struct commit *)o;
 325                 if (o->flags & THEY_HAVE)
 326                         we_knew_they_have = 1;
 327                 else
 328                         o->flags |= THEY_HAVE;
 329                 if (!oldest_have || (commit->date < oldest_have))
 330                         oldest_have = commit->date;
 331                 for (parents = commit->parents;
 332                      parents;
 333                      parents = parents->next)
 334                         parents->item->object.flags |= THEY_HAVE;
 335         }
 336         if (!we_knew_they_have) {
 337                 add_object_array(o, NULL, have_obj);
 338                 return 1;
 339         }
 340         return 0;
 341 }
 342
 343 static int ok_to_give_up(const struct object_array *have_obj,
 344                          struct object_array *want_obj)
 345 {
 346         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 347
 348         if (!have_obj->nr)
 349                 return 0;
 350
 351         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 352                                             COMMON_KNOWN, oldest_have,
 353                                             min_generation);
 354 }
 355
 356 static int get_common_commits(struct object_array *have_obj,
 357                               struct object_array *want_obj)
 358 {
 359         struct object_id oid;
 360         char last_hex[GIT_MAX_HEXSZ + 1];
 361         int got_common = 0;
 362         int got_other = 0;
 363         int sent_ready = 0;
 364
 365         save_commit_buffer = 0;
 366
 367         for (;;) {
 368                 char *line = packet_read_line(0, NULL);
 369                 const char *arg;
 370
 371                 reset_timeout();
 372
 373                 if (!line) {
 374                         if (multi_ack == 2 && got_common
 375                             && !got_other && ok_to_give_up(have_obj, want_obj)) {
 376                                 sent_ready = 1;
 377                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 378                         }
 379                         if (have_obj->nr == 0 || multi_ack)
 380                                 packet_write_fmt(1, "NAK\n");
 381
 382                         if (no_done && sent_ready) {
 383                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 384                                 return 0;
 385                         }
 386                         if (stateless_rpc)
 387                                 exit(0);
 388                         got_common = 0;
 389                         got_other = 0;
 390                         continue;
 391                 }
 392                 if (skip_prefix(line, "have ", &arg)) {
 393                         switch (got_oid(arg, &oid, have_obj)) {
 394                         case -1: /* they have what we do not */
 395                                 got_other = 1;
 396                                 if (multi_ack && ok_to_give_up(have_obj, want_obj)) {
 397                                         const char *hex = oid_to_hex(&oid);
 398                                         if (multi_ack == 2) {
 399                                                 sent_ready = 1;
 400                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 401                                         } else
 402                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 403                                 }
 404                                 break;
 405                         default:
 406                                 got_common = 1;
 407                                 oid_to_hex_r(last_hex, &oid);
 408                                 if (multi_ack == 2)
 409                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 410                                 else if (multi_ack)
 411                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 412                                 else if (have_obj->nr == 1)
 413                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 414                                 break;
 415                         }
 416                         continue;
 417                 }
 418                 if (!strcmp(line, "done")) {
 419                         if (have_obj->nr > 0) {
 420                                 if (multi_ack)
 421                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 422                                 return 0;
 423                         }
 424                         packet_write_fmt(1, "NAK\n");
 425                         return -1;
 426                 }
 427                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 428         }
 429 }
 430
 431 static int is_our_ref(struct object *o)
 432 {
 433         int allow_hidden_ref = (allow_unadvertised_object_request &
 434                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 435         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 436 }
 437
 438 /*
 439  * on successful case, it's up to the caller to close cmd->out
 440  */
 441 static int do_reachable_revlist(struct child_process *cmd,
 442                                 struct object_array *src,
 443                                 struct object_array *reachable)
 444 {
 445         static const char *argv[] = {
 446                 "rev-list", "--stdin", NULL,
 447         };
 448         struct object *o;
 449         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 450         int i;
 451         const unsigned hexsz = the_hash_algo->hexsz;
 452
 453         cmd->argv = argv;
 454         cmd->git_cmd = 1;
 455         cmd->no_stderr = 1;
 456         cmd->in = -1;
 457         cmd->out = -1;
 458
 459         /*
 460          * If the next rev-list --stdin encounters an unknown commit,
 461          * it terminates, which will cause SIGPIPE in the write loop
 462          * below.
 463          */
 464         sigchain_push(SIGPIPE, SIG_IGN);
 465
 466         if (start_command(cmd))
 467                 goto error;
 468
 469         namebuf[0] = '^';
 470         namebuf[hexsz + 1] = '\n';
 471         for (i = get_max_object_index(); 0 < i; ) {
 472                 o = get_indexed_object(--i);
 473                 if (!o)
 474                         continue;
 475                 if (reachable && o->type == OBJ_COMMIT)
 476                         o->flags &= ~TMP_MARK;
 477                 if (!is_our_ref(o))
 478                         continue;
 479                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 480                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 481                         goto error;
 482         }
 483         namebuf[hexsz] = '\n';
 484         for (i = 0; i < src->nr; i++) {
 485                 o = src->objects[i].item;
 486                 if (is_our_ref(o)) {
 487                         if (reachable)
 488                                 add_object_array(o, NULL, reachable);
 489                         continue;
 490                 }
 491                 if (reachable && o->type == OBJ_COMMIT)
 492                         o->flags |= TMP_MARK;
 493                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 494                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 495                         goto error;
 496         }
 497         close(cmd->in);
 498         cmd->in = -1;
 499         sigchain_pop(SIGPIPE);
 500
 501         return 0;
 502
 503 error:
 504         sigchain_pop(SIGPIPE);
 505
 506         if (cmd->in >= 0)
 507                 close(cmd->in);
 508         if (cmd->out >= 0)
 509                 close(cmd->out);
 510         return -1;
 511 }
 512
 513 static int get_reachable_list(struct object_array *src,
 514                               struct object_array *reachable)
 515 {
 516         struct child_process cmd = CHILD_PROCESS_INIT;
 517         int i;
 518         struct object *o;
 519         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 520         const unsigned hexsz = the_hash_algo->hexsz;
 521
 522         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 523                 return -1;
 524
 525         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 526                 struct object_id sha1;
 527                 const char *p;
 528
 529                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 530                         break;
 531
 532                 o = lookup_object(the_repository, sha1.hash);
 533                 if (o && o->type == OBJ_COMMIT) {
 534                         o->flags &= ~TMP_MARK;
 535                 }
 536         }
 537         for (i = get_max_object_index(); 0 < i; i--) {
 538                 o = get_indexed_object(i - 1);
 539                 if (o && o->type == OBJ_COMMIT &&
 540                     (o->flags & TMP_MARK)) {
 541                         add_object_array(o, NULL, reachable);
 542                                 o->flags &= ~TMP_MARK;
 543                 }
 544         }
 545         close(cmd.out);
 546
 547         if (finish_command(&cmd))
 548                 return -1;
 549
 550         return 0;
 551 }
 552
 553 static int has_unreachable(struct object_array *src)
 554 {
 555         struct child_process cmd = CHILD_PROCESS_INIT;
 556         char buf[1];
 557         int i;
 558
 559         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 560                 return 1;
 561
 562         /*
 563          * The commits out of the rev-list are not ancestors of
 564          * our ref.
 565          */
 566         i = read_in_full(cmd.out, buf, 1);
 567         if (i)
 568                 goto error;
 569         close(cmd.out);
 570         cmd.out = -1;
 571
 572         /*
 573          * rev-list may have died by encountering a bad commit
 574          * in the history, in which case we do want to bail out
 575          * even when it showed no commit.
 576          */
 577         if (finish_command(&cmd))
 578                 goto error;
 579
 580         /* All the non-tip ones are ancestors of what we advertised */
 581         return 0;
 582
 583 error:
 584         sigchain_pop(SIGPIPE);
 585         if (cmd.out >= 0)
 586                 close(cmd.out);
 587         return 1;
 588 }
 589
 590 static void check_non_tip(struct object_array *want_obj)
 591 {
 592         int i;
 593
 594         /*
 595          * In the normal in-process case without
 596          * uploadpack.allowReachableSHA1InWant,
 597          * non-tip requests can never happen.
 598          */
 599         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 600                 goto error;
 601         if (!has_unreachable(want_obj))
 602                 /* All the non-tip ones are ancestors of what we advertised */
 603                 return;
 604
 605 error:
 606         /* Pick one of them (we know there at least is one) */
 607         for (i = 0; i < want_obj->nr; i++) {
 608                 struct object *o = want_obj->objects[i].item;
 609                 if (!is_our_ref(o))
 610                         die("git upload-pack: not our ref %s",
 611                             oid_to_hex(&o->oid));
 612         }
 613 }
 614
 615 static void send_shallow(struct commit_list *result)
 616 {
 617         while (result) {
 618                 struct object *object = &result->item->object;
 619                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 620                         packet_write_fmt(1, "shallow %s",
 621                                          oid_to_hex(&object->oid));
 622                         register_shallow(the_repository, &object->oid);
 623                         shallow_nr++;
 624                 }
 625                 result = result->next;
 626         }
 627 }
 628
 629 static void send_unshallow(const struct object_array *shallows,
 630                            struct object_array *want_obj)
 631 {
 632         int i;
 633
 634         for (i = 0; i < shallows->nr; i++) {
 635                 struct object *object = shallows->objects[i].item;
 636                 if (object->flags & NOT_SHALLOW) {
 637                         struct commit_list *parents;
 638                         packet_write_fmt(1, "unshallow %s",
 639                                          oid_to_hex(&object->oid));
 640                         object->flags &= ~CLIENT_SHALLOW;
 641                         /*
 642                          * We want to _register_ "object" as shallow, but we
 643                          * also need to traverse object's parents to deepen a
 644                          * shallow clone. Unregister it for now so we can
 645                          * parse and add the parents to the want list, then
 646                          * re-register it.
 647                          */
 648                         unregister_shallow(&object->oid);
 649                         object->parsed = 0;
 650                         parse_commit_or_die((struct commit *)object);
 651                         parents = ((struct commit *)object)->parents;
 652                         while (parents) {
 653                                 add_object_array(&parents->item->object,
 654                                                  NULL, want_obj);
 655                                 parents = parents->next;
 656                         }
 657                         add_object_array(object, NULL, &extra_edge_obj);
 658                 }
 659                 /* make sure commit traversal conforms to client */
 660                 register_shallow(the_repository, &object->oid);
 661         }
 662 }
 663
 664 static int check_ref(const char *refname_full, const struct object_id *oid,
 665                      int flag, void *cb_data);
 666
 667 static void deepen(int depth, int deepen_relative,
 668                    struct object_array *shallows, struct object_array *want_obj)
 669 {
 670         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 671                 int i;
 672
 673                 for (i = 0; i < shallows->nr; i++) {
 674                         struct object *object = shallows->objects[i].item;
 675                         object->flags |= NOT_SHALLOW;
 676                 }
 677         } else if (deepen_relative) {
 678                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 679                 struct commit_list *result;
 680
 681                 /*
 682                  * Checking for reachable shallows requires that our refs be
 683                  * marked with OUR_REF.
 684                  */
 685                 head_ref_namespaced(check_ref, NULL);
 686                 for_each_namespaced_ref(check_ref, NULL);
 687
 688                 get_reachable_list(shallows, &reachable_shallows);
 689                 result = get_shallow_commits(&reachable_shallows,
 690                                              depth + 1,
 691                                              SHALLOW, NOT_SHALLOW);
 692                 send_shallow(result);
 693                 free_commit_list(result);
 694                 object_array_clear(&reachable_shallows);
 695         } else {
 696                 struct commit_list *result;
 697
 698                 result = get_shallow_commits(want_obj, depth,
 699                                              SHALLOW, NOT_SHALLOW);
 700                 send_shallow(result);
 701                 free_commit_list(result);
 702         }
 703
 704         send_unshallow(shallows, want_obj);
 705 }
 706
 707 static void deepen_by_rev_list(int ac, const char **av,
 708                                struct object_array *shallows,
 709                                struct object_array *want_obj)
 710 {
 711         struct commit_list *result;
 712
 713         close_commit_graph(the_repository);
 714         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 715         send_shallow(result);
 716         free_commit_list(result);
 717         send_unshallow(shallows, want_obj);
 718 }
 719
 720 /* Returns 1 if a shallow list is sent or 0 otherwise */
 721 static int send_shallow_list(int depth, int deepen_rev_list,
 722                              timestamp_t deepen_since,
 723                              struct string_list *deepen_not,
 724                              int deepen_relative,
 725                              struct object_array *shallows,
 726                              struct object_array *want_obj)
 727 {
 728         int ret = 0;
 729
 730         if (depth > 0 && deepen_rev_list)
 731                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 732         if (depth > 0) {
 733                 deepen(depth, deepen_relative, shallows, want_obj);
 734                 ret = 1;
 735         } else if (deepen_rev_list) {
 736                 struct argv_array av = ARGV_ARRAY_INIT;
 737                 int i;
 738
 739                 argv_array_push(&av, "rev-list");
 740                 if (deepen_since)
 741                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 742                 if (deepen_not->nr) {
 743                         argv_array_push(&av, "--not");
 744                         for (i = 0; i < deepen_not->nr; i++) {
 745                                 struct string_list_item *s = deepen_not->items + i;
 746                                 argv_array_push(&av, s->string);
 747                         }
 748                         argv_array_push(&av, "--not");
 749                 }
 750                 for (i = 0; i < want_obj->nr; i++) {
 751                         struct object *o = want_obj->objects[i].item;
 752                         argv_array_push(&av, oid_to_hex(&o->oid));
 753                 }
 754                 deepen_by_rev_list(av.argc, av.argv, shallows, want_obj);
 755                 argv_array_clear(&av);
 756                 ret = 1;
 757         } else {
 758                 if (shallows->nr > 0) {
 759                         int i;
 760                         for (i = 0; i < shallows->nr; i++)
 761                                 register_shallow(the_repository,
 762                                                  &shallows->objects[i].item->oid);
 763                 }
 764         }
 765
 766         shallow_nr += shallows->nr;
 767         return ret;
 768 }
 769
 770 static int process_shallow(const char *line, struct object_array *shallows)
 771 {
 772         const char *arg;
 773         if (skip_prefix(line, "shallow ", &arg)) {
 774                 struct object_id oid;
 775                 struct object *object;
 776                 if (get_oid_hex(arg, &oid))
 777                         die("invalid shallow line: %s", line);
 778                 object = parse_object(the_repository, &oid);
 779                 if (!object)
 780                         return 1;
 781                 if (object->type != OBJ_COMMIT)
 782                         die("invalid shallow object %s", oid_to_hex(&oid));
 783                 if (!(object->flags & CLIENT_SHALLOW)) {
 784                         object->flags |= CLIENT_SHALLOW;
 785                         add_object_array(object, NULL, shallows);
 786                 }
 787                 return 1;
 788         }
 789
 790         return 0;
 791 }
 792
 793 static int process_deepen(const char *line, int *depth)
 794 {
 795         const char *arg;
 796         if (skip_prefix(line, "deepen ", &arg)) {
 797                 char *end = NULL;
 798                 *depth = (int)strtol(arg, &end, 0);
 799                 if (!end || *end || *depth <= 0)
 800                         die("Invalid deepen: %s", line);
 801                 return 1;
 802         }
 803
 804         return 0;
 805 }
 806
 807 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 808 {
 809         const char *arg;
 810         if (skip_prefix(line, "deepen-since ", &arg)) {
 811                 char *end = NULL;
 812                 *deepen_since = parse_timestamp(arg, &end, 0);
 813                 if (!end || *end || !deepen_since ||
 814                     /* revisions.c's max_age -1 is special */
 815                     *deepen_since == -1)
 816                         die("Invalid deepen-since: %s", line);
 817                 *deepen_rev_list = 1;
 818                 return 1;
 819         }
 820         return 0;
 821 }
 822
 823 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 824 {
 825         const char *arg;
 826         if (skip_prefix(line, "deepen-not ", &arg)) {
 827                 char *ref = NULL;
 828                 struct object_id oid;
 829                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 830                         die("git upload-pack: ambiguous deepen-not: %s", line);
 831                 string_list_append(deepen_not, ref);
 832                 free(ref);
 833                 *deepen_rev_list = 1;
 834                 return 1;
 835         }
 836         return 0;
 837 }
 838
 839 static void receive_needs(struct object_array *want_obj)
 840 {
 841         struct object_array shallows = OBJECT_ARRAY_INIT;
 842         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 843         int depth = 0;
 844         int has_non_tip = 0;
 845         timestamp_t deepen_since = 0;
 846         int deepen_rev_list = 0;
 847         int deepen_relative = 0;
 848
 849         shallow_nr = 0;
 850         for (;;) {
 851                 struct object *o;
 852                 const char *features;
 853                 struct object_id oid_buf;
 854                 char *line = packet_read_line(0, NULL);
 855                 const char *arg;
 856
 857                 reset_timeout();
 858                 if (!line)
 859                         break;
 860
 861                 if (process_shallow(line, &shallows))
 862                         continue;
 863                 if (process_deepen(line, &depth))
 864                         continue;
 865                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 866                         continue;
 867                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 868                         continue;
 869
 870                 if (skip_prefix(line, "filter ", &arg)) {
 871                         if (!filter_capability_requested)
 872                                 die("git upload-pack: filtering capability not negotiated");
 873                         parse_list_objects_filter(&filter_options, arg);
 874                         continue;
 875                 }
 876
 877                 if (!skip_prefix(line, "want ", &arg) ||
 878                     parse_oid_hex(arg, &oid_buf, &features))
 879                         die("git upload-pack: protocol error, "
 880                             "expected to get object ID, not '%s'", line);
 881
 882                 if (parse_feature_request(features, "deepen-relative"))
 883                         deepen_relative = 1;
 884                 if (parse_feature_request(features, "multi_ack_detailed"))
 885                         multi_ack = 2;
 886                 else if (parse_feature_request(features, "multi_ack"))
 887                         multi_ack = 1;
 888                 if (parse_feature_request(features, "no-done"))
 889                         no_done = 1;
 890                 if (parse_feature_request(features, "thin-pack"))
 891                         use_thin_pack = 1;
 892                 if (parse_feature_request(features, "ofs-delta"))
 893                         use_ofs_delta = 1;
 894                 if (parse_feature_request(features, "side-band-64k"))
 895                         use_sideband = LARGE_PACKET_MAX;
 896                 else if (parse_feature_request(features, "side-band"))
 897                         use_sideband = DEFAULT_PACKET_MAX;
 898                 if (parse_feature_request(features, "no-progress"))
 899                         no_progress = 1;
 900                 if (parse_feature_request(features, "include-tag"))
 901                         use_include_tag = 1;
 902                 if (allow_filter && parse_feature_request(features, "filter"))
 903                         filter_capability_requested = 1;
 904
 905                 o = parse_object(the_repository, &oid_buf);
 906                 if (!o) {
 907                         packet_write_fmt(1,
 908                                          "ERR upload-pack: not our ref %s",
 909                                          oid_to_hex(&oid_buf));
 910                         die("git upload-pack: not our ref %s",
 911                             oid_to_hex(&oid_buf));
 912                 }
 913                 if (!(o->flags & WANTED)) {
 914                         o->flags |= WANTED;
 915                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 916                               || is_our_ref(o)))
 917                                 has_non_tip = 1;
 918                         add_object_array(o, NULL, want_obj);
 919                 }
 920         }
 921
 922         /*
 923          * We have sent all our refs already, and the other end
 924          * should have chosen out of them. When we are operating
 925          * in the stateless RPC mode, however, their choice may
 926          * have been based on the set of older refs advertised
 927          * by another process that handled the initial request.
 928          */
 929         if (has_non_tip)
 930                 check_non_tip(want_obj);
 931
 932         if (!use_sideband && daemon_mode)
 933                 no_progress = 1;
 934
 935         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 936                 return;
 937
 938         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 939                               &deepen_not, deepen_relative, &shallows,
 940                               want_obj))
 941                 packet_flush(1);
 942         object_array_clear(&shallows);
 943 }
 944
 945 /* return non-zero if the ref is hidden, otherwise 0 */
 946 static int mark_our_ref(const char *refname, const char *refname_full,
 947                         const struct object_id *oid)
 948 {
 949         struct object *o = lookup_unknown_object(oid->hash);
 950
 951         if (ref_is_hidden(refname, refname_full)) {
 952                 o->flags |= HIDDEN_REF;
 953                 return 1;
 954         }
 955         o->flags |= OUR_REF;
 956         return 0;
 957 }
 958
 959 static int check_ref(const char *refname_full, const struct object_id *oid,
 960                      int flag, void *cb_data)
 961 {
 962         const char *refname = strip_namespace(refname_full);
 963
 964         mark_our_ref(refname, refname_full, oid);
 965         return 0;
 966 }
 967
 968 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 969 {
 970         struct string_list_item *item;
 971
 972         if (!symref->nr)
 973                 return;
 974         for_each_string_list_item(item, symref)
 975                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 976 }
 977
 978 static int send_ref(const char *refname, const struct object_id *oid,
 979                     int flag, void *cb_data)
 980 {
 981         static const char *capabilities = "multi_ack thin-pack side-band"
 982                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 983                 " deepen-relative no-progress include-tag multi_ack_detailed";
 984         const char *refname_nons = strip_namespace(refname);
 985         struct object_id peeled;
 986
 987         if (mark_our_ref(refname_nons, refname, oid))
 988                 return 0;
 989
 990         if (capabilities) {
 991                 struct strbuf symref_info = STRBUF_INIT;
 992
 993                 format_symref_info(&symref_info, cb_data);
 994                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
 995                              oid_to_hex(oid), refname_nons,
 996                              0, capabilities,
 997                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 998                                      " allow-tip-sha1-in-want" : "",
 999                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1000                                      " allow-reachable-sha1-in-want" : "",
1001                              stateless_rpc ? " no-done" : "",
1002                              symref_info.buf,
1003                              allow_filter ? " filter" : "",
1004                              git_user_agent_sanitized());
1005                 strbuf_release(&symref_info);
1006         } else {
1007                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1008         }
1009         capabilities = NULL;
1010         if (!peel_ref(refname, &peeled))
1011                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1012         return 0;
1013 }
1014
1015 static int find_symref(const char *refname, const struct object_id *oid,
1016                        int flag, void *cb_data)
1017 {
1018         const char *symref_target;
1019         struct string_list_item *item;
1020
1021         if ((flag & REF_ISSYMREF) == 0)
1022                 return 0;
1023         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1024         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1025                 die("'%s' is a symref but it is not?", refname);
1026         item = string_list_append(cb_data, refname);
1027         item->util = xstrdup(symref_target);
1028         return 0;
1029 }
1030
1031 static int upload_pack_config(const char *var, const char *value, void *unused)
1032 {
1033         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1034                 if (git_config_bool(var, value))
1035                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1036                 else
1037                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1038         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1039                 if (git_config_bool(var, value))
1040                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1041                 else
1042                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1043         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1044                 if (git_config_bool(var, value))
1045                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1046                 else
1047                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1048         } else if (!strcmp("uploadpack.keepalive", var)) {
1049                 keepalive = git_config_int(var, value);
1050                 if (!keepalive)
1051                         keepalive = -1;
1052         } else if (!strcmp("uploadpack.allowfilter", var)) {
1053                 allow_filter = git_config_bool(var, value);
1054         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1055                 allow_ref_in_want = git_config_bool(var, value);
1056         }
1057
1058         if (current_config_scope() != CONFIG_SCOPE_REPO) {
1059                 if (!strcmp("uploadpack.packobjectshook", var))
1060                         return git_config_string(&pack_objects_hook, var, value);
1061         }
1062
1063         return parse_hide_refs_config(var, value, "uploadpack");
1064 }
1065
1066 void upload_pack(struct upload_pack_options *options)
1067 {
1068         struct string_list symref = STRING_LIST_INIT_DUP;
1069         struct object_array want_obj = OBJECT_ARRAY_INIT;
1070
1071         stateless_rpc = options->stateless_rpc;
1072         timeout = options->timeout;
1073         daemon_mode = options->daemon_mode;
1074
1075         git_config(upload_pack_config, NULL);
1076
1077         head_ref_namespaced(find_symref, &symref);
1078
1079         if (options->advertise_refs || !stateless_rpc) {
1080                 reset_timeout();
1081                 head_ref_namespaced(send_ref, &symref);
1082                 for_each_namespaced_ref(send_ref, &symref);
1083                 advertise_shallow_grafts(1);
1084                 packet_flush(1);
1085         } else {
1086                 head_ref_namespaced(check_ref, NULL);
1087                 for_each_namespaced_ref(check_ref, NULL);
1088         }
1089         string_list_clear(&symref, 1);
1090         if (options->advertise_refs)
1091                 return;
1092
1093         receive_needs(&want_obj);
1094         if (want_obj.nr) {
1095                 struct object_array have_obj = OBJECT_ARRAY_INIT;
1096                 get_common_commits(&have_obj, &want_obj);
1097                 create_pack_file(&have_obj, &want_obj);
1098         }
1099 }
1100
1101 struct upload_pack_data {
1102         struct object_array wants;
1103         struct string_list wanted_refs;
1104         struct oid_array haves;
1105
1106         struct object_array shallows;
1107         struct string_list deepen_not;
1108         int depth;
1109         timestamp_t deepen_since;
1110         int deepen_rev_list;
1111         int deepen_relative;
1112
1113         unsigned stateless_rpc : 1;
1114
1115         unsigned use_thin_pack : 1;
1116         unsigned use_ofs_delta : 1;
1117         unsigned no_progress : 1;
1118         unsigned use_include_tag : 1;
1119         unsigned done : 1;
1120 };
1121
1122 static void upload_pack_data_init(struct upload_pack_data *data)
1123 {
1124         struct object_array wants = OBJECT_ARRAY_INIT;
1125         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1126         struct oid_array haves = OID_ARRAY_INIT;
1127         struct object_array shallows = OBJECT_ARRAY_INIT;
1128         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1129
1130         memset(data, 0, sizeof(*data));
1131         data->wants = wants;
1132         data->wanted_refs = wanted_refs;
1133         data->haves = haves;
1134         data->shallows = shallows;
1135         data->deepen_not = deepen_not;
1136 }
1137
1138 static void upload_pack_data_clear(struct upload_pack_data *data)
1139 {
1140         object_array_clear(&data->wants);
1141         string_list_clear(&data->wanted_refs, 1);
1142         oid_array_clear(&data->haves);
1143         object_array_clear(&data->shallows);
1144         string_list_clear(&data->deepen_not, 0);
1145 }
1146
1147 static int parse_want(const char *line, struct object_array *want_obj)
1148 {
1149         const char *arg;
1150         if (skip_prefix(line, "want ", &arg)) {
1151                 struct object_id oid;
1152                 struct object *o;
1153
1154                 if (get_oid_hex(arg, &oid))
1155                         die("git upload-pack: protocol error, "
1156                             "expected to get oid, not '%s'", line);
1157
1158                 o = parse_object(the_repository, &oid);
1159                 if (!o) {
1160                         packet_write_fmt(1,
1161                                          "ERR upload-pack: not our ref %s",
1162                                          oid_to_hex(&oid));
1163                         die("git upload-pack: not our ref %s",
1164                             oid_to_hex(&oid));
1165                 }
1166
1167                 if (!(o->flags & WANTED)) {
1168                         o->flags |= WANTED;
1169                         add_object_array(o, NULL, want_obj);
1170                 }
1171
1172                 return 1;
1173         }
1174
1175         return 0;
1176 }
1177
1178 static int parse_want_ref(const char *line, struct string_list *wanted_refs,
1179                           struct object_array *want_obj)
1180 {
1181         const char *arg;
1182         if (skip_prefix(line, "want-ref ", &arg)) {
1183                 struct object_id oid;
1184                 struct string_list_item *item;
1185                 struct object *o;
1186
1187                 if (read_ref(arg, &oid)) {
1188                         packet_write_fmt(1, "ERR unknown ref %s", arg);
1189                         die("unknown ref %s", arg);
1190                 }
1191
1192                 item = string_list_append(wanted_refs, arg);
1193                 item->util = oiddup(&oid);
1194
1195                 o = parse_object_or_die(&oid, arg);
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_have(const char *line, struct oid_array *haves)
1208 {
1209         const char *arg;
1210         if (skip_prefix(line, "have ", &arg)) {
1211                 struct object_id oid;
1212
1213                 if (get_oid_hex(arg, &oid))
1214                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1215                 oid_array_append(haves, &oid);
1216                 return 1;
1217         }
1218
1219         return 0;
1220 }
1221
1222 static void process_args(struct packet_reader *request,
1223                          struct upload_pack_data *data,
1224                          struct object_array *want_obj)
1225 {
1226         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1227                 const char *arg = request->line;
1228                 const char *p;
1229
1230                 /* process want */
1231                 if (parse_want(arg, want_obj))
1232                         continue;
1233                 if (allow_ref_in_want &&
1234                     parse_want_ref(arg, &data->wanted_refs, want_obj))
1235                         continue;
1236                 /* process have line */
1237                 if (parse_have(arg, &data->haves))
1238                         continue;
1239
1240                 /* process args like thin-pack */
1241                 if (!strcmp(arg, "thin-pack")) {
1242                         use_thin_pack = 1;
1243                         continue;
1244                 }
1245                 if (!strcmp(arg, "ofs-delta")) {
1246                         use_ofs_delta = 1;
1247                         continue;
1248                 }
1249                 if (!strcmp(arg, "no-progress")) {
1250                         no_progress = 1;
1251                         continue;
1252                 }
1253                 if (!strcmp(arg, "include-tag")) {
1254                         use_include_tag = 1;
1255                         continue;
1256                 }
1257                 if (!strcmp(arg, "done")) {
1258                         data->done = 1;
1259                         continue;
1260                 }
1261
1262                 /* Shallow related arguments */
1263                 if (process_shallow(arg, &data->shallows))
1264                         continue;
1265                 if (process_deepen(arg, &data->depth))
1266                         continue;
1267                 if (process_deepen_since(arg, &data->deepen_since,
1268                                          &data->deepen_rev_list))
1269                         continue;
1270                 if (process_deepen_not(arg, &data->deepen_not,
1271                                        &data->deepen_rev_list))
1272                         continue;
1273                 if (!strcmp(arg, "deepen-relative")) {
1274                         data->deepen_relative = 1;
1275                         continue;
1276                 }
1277
1278                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1279                         parse_list_objects_filter(&filter_options, p);
1280                         continue;
1281                 }
1282
1283                 /* ignore unknown lines maybe? */
1284                 die("unexpected line: '%s'", arg);
1285         }
1286 }
1287
1288 static int process_haves(struct oid_array *haves, struct oid_array *common,
1289                          struct object_array *have_obj)
1290 {
1291         int i;
1292
1293         /* Process haves */
1294         for (i = 0; i < haves->nr; i++) {
1295                 const struct object_id *oid = &haves->oid[i];
1296                 struct object *o;
1297                 int we_knew_they_have = 0;
1298
1299                 if (!has_object_file(oid))
1300                         continue;
1301
1302                 oid_array_append(common, oid);
1303
1304                 o = parse_object(the_repository, oid);
1305                 if (!o)
1306                         die("oops (%s)", oid_to_hex(oid));
1307                 if (o->type == OBJ_COMMIT) {
1308                         struct commit_list *parents;
1309                         struct commit *commit = (struct commit *)o;
1310                         if (o->flags & THEY_HAVE)
1311                                 we_knew_they_have = 1;
1312                         else
1313                                 o->flags |= THEY_HAVE;
1314                         if (!oldest_have || (commit->date < oldest_have))
1315                                 oldest_have = commit->date;
1316                         for (parents = commit->parents;
1317                              parents;
1318                              parents = parents->next)
1319                                 parents->item->object.flags |= THEY_HAVE;
1320                 }
1321                 if (!we_knew_they_have)
1322                         add_object_array(o, NULL, have_obj);
1323         }
1324
1325         return 0;
1326 }
1327
1328 static int send_acks(struct oid_array *acks, struct strbuf *response,
1329                      const struct object_array *have_obj,
1330                      struct object_array *want_obj)
1331 {
1332         int i;
1333
1334         packet_buf_write(response, "acknowledgments\n");
1335
1336         /* Send Acks */
1337         if (!acks->nr)
1338                 packet_buf_write(response, "NAK\n");
1339
1340         for (i = 0; i < acks->nr; i++) {
1341                 packet_buf_write(response, "ACK %s\n",
1342                                  oid_to_hex(&acks->oid[i]));
1343         }
1344
1345         if (ok_to_give_up(have_obj, want_obj)) {
1346                 /* Send Ready */
1347                 packet_buf_write(response, "ready\n");
1348                 return 1;
1349         }
1350
1351         return 0;
1352 }
1353
1354 static int process_haves_and_send_acks(struct upload_pack_data *data,
1355                                        struct object_array *have_obj,
1356                                        struct object_array *want_obj)
1357 {
1358         struct oid_array common = OID_ARRAY_INIT;
1359         struct strbuf response = STRBUF_INIT;
1360         int ret = 0;
1361
1362         process_haves(&data->haves, &common, have_obj);
1363         if (data->done) {
1364                 ret = 1;
1365         } else if (send_acks(&common, &response, have_obj, want_obj)) {
1366                 packet_buf_delim(&response);
1367                 ret = 1;
1368         } else {
1369                 /* Add Flush */
1370                 packet_buf_flush(&response);
1371                 ret = 0;
1372         }
1373
1374         /* Send response */
1375         write_or_die(1, response.buf, response.len);
1376         strbuf_release(&response);
1377
1378         oid_array_clear(&data->haves);
1379         oid_array_clear(&common);
1380         return ret;
1381 }
1382
1383 static void send_wanted_ref_info(struct upload_pack_data *data)
1384 {
1385         const struct string_list_item *item;
1386
1387         if (!data->wanted_refs.nr)
1388                 return;
1389
1390         packet_write_fmt(1, "wanted-refs\n");
1391
1392         for_each_string_list_item(item, &data->wanted_refs) {
1393                 packet_write_fmt(1, "%s %s\n",
1394                                  oid_to_hex(item->util),
1395                                  item->string);
1396         }
1397
1398         packet_delim(1);
1399 }
1400
1401 static void send_shallow_info(struct upload_pack_data *data,
1402                               struct object_array *want_obj)
1403 {
1404         /* No shallow info needs to be sent */
1405         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1406             !is_repository_shallow(the_repository))
1407                 return;
1408
1409         packet_write_fmt(1, "shallow-info\n");
1410
1411         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1412                                data->deepen_since, &data->deepen_not,
1413                                data->deepen_relative,
1414                                &data->shallows, want_obj) &&
1415             is_repository_shallow(the_repository))
1416                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows,
1417                        want_obj);
1418
1419         packet_delim(1);
1420 }
1421
1422 enum fetch_state {
1423         FETCH_PROCESS_ARGS = 0,
1424         FETCH_SEND_ACKS,
1425         FETCH_SEND_PACK,
1426         FETCH_DONE,
1427 };
1428
1429 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1430                    struct packet_reader *request)
1431 {
1432         enum fetch_state state = FETCH_PROCESS_ARGS;
1433         struct upload_pack_data data;
1434         struct object_array have_obj = OBJECT_ARRAY_INIT;
1435         struct object_array want_obj = OBJECT_ARRAY_INIT;
1436
1437         clear_object_flags(ALL_FLAGS);
1438
1439         git_config(upload_pack_config, NULL);
1440
1441         upload_pack_data_init(&data);
1442         use_sideband = LARGE_PACKET_MAX;
1443
1444         while (state != FETCH_DONE) {
1445                 switch (state) {
1446                 case FETCH_PROCESS_ARGS:
1447                         process_args(request, &data, &want_obj);
1448
1449                         if (!want_obj.nr) {
1450                                 /*
1451                                  * Request didn't contain any 'want' lines,
1452                                  * guess they didn't want anything.
1453                                  */
1454                                 state = FETCH_DONE;
1455                         } else if (data.haves.nr) {
1456                                 /*
1457                                  * Request had 'have' lines, so lets ACK them.
1458                                  */
1459                                 state = FETCH_SEND_ACKS;
1460                         } else {
1461                                 /*
1462                                  * Request had 'want's but no 'have's so we can
1463                                  * immedietly go to construct and send a pack.
1464                                  */
1465                                 state = FETCH_SEND_PACK;
1466                         }
1467                         break;
1468                 case FETCH_SEND_ACKS:
1469                         if (process_haves_and_send_acks(&data, &have_obj,
1470                                                         &want_obj))
1471                                 state = FETCH_SEND_PACK;
1472                         else
1473                                 state = FETCH_DONE;
1474                         break;
1475                 case FETCH_SEND_PACK:
1476                         send_wanted_ref_info(&data);
1477                         send_shallow_info(&data, &want_obj);
1478
1479                         packet_write_fmt(1, "packfile\n");
1480                         create_pack_file(&have_obj, &want_obj);
1481                         state = FETCH_DONE;
1482                         break;
1483                 case FETCH_DONE:
1484                         continue;
1485                 }
1486         }
1487
1488         upload_pack_data_clear(&data);
1489         object_array_clear(&have_obj);
1490         object_array_clear(&want_obj);
1491         return 0;
1492 }
1493
1494 int upload_pack_advertise(struct repository *r,
1495                           struct strbuf *value)
1496 {
1497         if (value) {
1498                 int allow_filter_value;
1499                 int allow_ref_in_want;
1500
1501                 strbuf_addstr(value, "shallow");
1502
1503                 if (!repo_config_get_bool(the_repository,
1504                                          "uploadpack.allowfilter",
1505                                          &allow_filter_value) &&
1506                     allow_filter_value)
1507                         strbuf_addstr(value, " filter");
1508
1509                 if (!repo_config_get_bool(the_repository,
1510                                          "uploadpack.allowrefinwant",
1511                                          &allow_ref_in_want) &&
1512                     allow_ref_in_want)
1513                         strbuf_addstr(value, " ref-in-want");
1514         }
1515
1516         return 1;
1517 }