git.oblomov.eu Git - git/blob - upload-pack.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "repository.h"
   7 #include "object-store.h"
   8 #include "tag.h"
   9 #include "object.h"
  10 #include "commit.h"
  11 #include "diff.h"
  12 #include "revision.h"
  13 #include "list-objects.h"
  14 #include "list-objects-filter.h"
  15 #include "list-objects-filter-options.h"
  16 #include "run-command.h"
  17 #include "connect.h"
  18 #include "sigchain.h"
  19 #include "version.h"
  20 #include "string-list.h"
  21 #include "argv-array.h"
  22 #include "prio-queue.h"
  23 #include "protocol.h"
  24 #include "quote.h"
  25 #include "upload-pack.h"
  26 #include "serve.h"
  27 #include "commit-graph.h"
  28 #include "commit-reach.h"
  29
  30 /* Remember to update object flag allocation in object.h */
  31 #define THEY_HAVE       (1u << 11)
  32 #define OUR_REF         (1u << 12)
  33 #define WANTED          (1u << 13)
  34 #define COMMON_KNOWN    (1u << 14)
  35
  36 #define SHALLOW         (1u << 16)
  37 #define NOT_SHALLOW     (1u << 17)
  38 #define CLIENT_SHALLOW  (1u << 18)
  39 #define HIDDEN_REF      (1u << 19)
  40
  41 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
  42                 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
  43
  44 static timestamp_t oldest_have;
  45
  46 static int multi_ack;
  47 static int no_done;
  48 static int use_thin_pack, use_ofs_delta, use_include_tag;
  49 static int no_progress, daemon_mode;
  50 /* Allow specifying sha1 if it is a ref tip. */
  51 #define ALLOW_TIP_SHA1  01
  52 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  53 #define ALLOW_REACHABLE_SHA1    02
  54 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  55 #define ALLOW_ANY_SHA1  07
  56 static unsigned int allow_unadvertised_object_request;
  57 static int shallow_nr;
  58 static struct object_array extra_edge_obj;
  59 static unsigned int timeout;
  60 static int keepalive = 5;
  61 /* 0 for no sideband,
  62  * otherwise maximum packet size (up to 65520 bytes).
  63  */
  64 static int use_sideband;
  65 static int stateless_rpc;
  66 static const char *pack_objects_hook;
  67
  68 static int filter_capability_requested;
  69 static int allow_filter;
  70 static int allow_ref_in_want;
  71 static struct list_objects_filter_options filter_options;
  72
  73 static int allow_sideband_all;
  74
  75 static void reset_timeout(void)
  76 {
  77         alarm(timeout);
  78 }
  79
  80 static void send_client_data(int fd, const char *data, ssize_t sz)
  81 {
  82         if (use_sideband) {
  83                 send_sideband(1, fd, data, sz, use_sideband);
  84                 return;
  85         }
  86         if (fd == 3)
  87                 /* emergency quit */
  88                 fd = 2;
  89         if (fd == 2) {
  90                 /* XXX: are we happy to lose stuff here? */
  91                 xwrite(fd, data, sz);
  92                 return;
  93         }
  94         write_or_die(fd, data, sz);
  95 }
  96
  97 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  98 {
  99         FILE *fp = cb_data;
 100         if (graft->nr_parent == -1)
 101                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 102         return 0;
 103 }
 104
 105 static void create_pack_file(const struct object_array *have_obj,
 106                              const struct object_array *want_obj)
 107 {
 108         struct child_process pack_objects = CHILD_PROCESS_INIT;
 109         char data[8193], progress[128];
 110         char abort_msg[] = "aborting due to possible repository "
 111                 "corruption on the remote side.";
 112         int buffered = -1;
 113         ssize_t sz;
 114         int i;
 115         FILE *pipe_fd;
 116
 117         if (!pack_objects_hook)
 118                 pack_objects.git_cmd = 1;
 119         else {
 120                 argv_array_push(&pack_objects.args, pack_objects_hook);
 121                 argv_array_push(&pack_objects.args, "git");
 122                 pack_objects.use_shell = 1;
 123         }
 124
 125         if (shallow_nr) {
 126                 argv_array_push(&pack_objects.args, "--shallow-file");
 127                 argv_array_push(&pack_objects.args, "");
 128         }
 129         argv_array_push(&pack_objects.args, "pack-objects");
 130         argv_array_push(&pack_objects.args, "--revs");
 131         if (use_thin_pack)
 132                 argv_array_push(&pack_objects.args, "--thin");
 133
 134         argv_array_push(&pack_objects.args, "--stdout");
 135         if (shallow_nr)
 136                 argv_array_push(&pack_objects.args, "--shallow");
 137         if (!no_progress)
 138                 argv_array_push(&pack_objects.args, "--progress");
 139         if (use_ofs_delta)
 140                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 141         if (use_include_tag)
 142                 argv_array_push(&pack_objects.args, "--include-tag");
 143         if (filter_options.choice) {
 144                 const char *spec =
 145                         expand_list_objects_filter_spec(&filter_options);
 146                 if (pack_objects.use_shell) {
 147                         struct strbuf buf = STRBUF_INIT;
 148                         sq_quote_buf(&buf, spec);
 149                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 150                         strbuf_release(&buf);
 151                 } else {
 152                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 153                                          spec);
 154                 }
 155         }
 156
 157         pack_objects.in = -1;
 158         pack_objects.out = -1;
 159         pack_objects.err = -1;
 160
 161         if (start_command(&pack_objects))
 162                 die("git upload-pack: unable to fork git-pack-objects");
 163
 164         pipe_fd = xfdopen(pack_objects.in, "w");
 165
 166         if (shallow_nr)
 167                 for_each_commit_graft(write_one_shallow, pipe_fd);
 168
 169         for (i = 0; i < want_obj->nr; i++)
 170                 fprintf(pipe_fd, "%s\n",
 171                         oid_to_hex(&want_obj->objects[i].item->oid));
 172         fprintf(pipe_fd, "--not\n");
 173         for (i = 0; i < have_obj->nr; i++)
 174                 fprintf(pipe_fd, "%s\n",
 175                         oid_to_hex(&have_obj->objects[i].item->oid));
 176         for (i = 0; i < extra_edge_obj.nr; i++)
 177                 fprintf(pipe_fd, "%s\n",
 178                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 179         fprintf(pipe_fd, "\n");
 180         fflush(pipe_fd);
 181         fclose(pipe_fd);
 182
 183         /* We read from pack_objects.err to capture stderr output for
 184          * progress bar, and pack_objects.out to capture the pack data.
 185          */
 186
 187         while (1) {
 188                 struct pollfd pfd[2];
 189                 int pe, pu, pollsize;
 190                 int ret;
 191
 192                 reset_timeout();
 193
 194                 pollsize = 0;
 195                 pe = pu = -1;
 196
 197                 if (0 <= pack_objects.out) {
 198                         pfd[pollsize].fd = pack_objects.out;
 199                         pfd[pollsize].events = POLLIN;
 200                         pu = pollsize;
 201                         pollsize++;
 202                 }
 203                 if (0 <= pack_objects.err) {
 204                         pfd[pollsize].fd = pack_objects.err;
 205                         pfd[pollsize].events = POLLIN;
 206                         pe = pollsize;
 207                         pollsize++;
 208                 }
 209
 210                 if (!pollsize)
 211                         break;
 212
 213                 ret = poll(pfd, pollsize,
 214                         keepalive < 0 ? -1 : 1000 * keepalive);
 215
 216                 if (ret < 0) {
 217                         if (errno != EINTR) {
 218                                 error_errno("poll failed, resuming");
 219                                 sleep(1);
 220                         }
 221                         continue;
 222                 }
 223                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 224                         /* Status ready; we ship that in the side-band
 225                          * or dump to the standard error.
 226                          */
 227                         sz = xread(pack_objects.err, progress,
 228                                   sizeof(progress));
 229                         if (0 < sz)
 230                                 send_client_data(2, progress, sz);
 231                         else if (sz == 0) {
 232                                 close(pack_objects.err);
 233                                 pack_objects.err = -1;
 234                         }
 235                         else
 236                                 goto fail;
 237                         /* give priority to status messages */
 238                         continue;
 239                 }
 240                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 241                         /* Data ready; we keep the last byte to ourselves
 242                          * in case we detect broken rev-list, so that we
 243                          * can leave the stream corrupted.  This is
 244                          * unfortunate -- unpack-objects would happily
 245                          * accept a valid packdata with trailing garbage,
 246                          * so appending garbage after we pass all the
 247                          * pack data is not good enough to signal
 248                          * breakage to downstream.
 249                          */
 250                         char *cp = data;
 251                         ssize_t outsz = 0;
 252                         if (0 <= buffered) {
 253                                 *cp++ = buffered;
 254                                 outsz++;
 255                         }
 256                         sz = xread(pack_objects.out, cp,
 257                                   sizeof(data) - outsz);
 258                         if (0 < sz)
 259                                 ;
 260                         else if (sz == 0) {
 261                                 close(pack_objects.out);
 262                                 pack_objects.out = -1;
 263                         }
 264                         else
 265                                 goto fail;
 266                         sz += outsz;
 267                         if (1 < sz) {
 268                                 buffered = data[sz-1] & 0xFF;
 269                                 sz--;
 270                         }
 271                         else
 272                                 buffered = -1;
 273                         send_client_data(1, data, sz);
 274                 }
 275
 276                 /*
 277                  * We hit the keepalive timeout without saying anything; send
 278                  * an empty message on the data sideband just to let the other
 279                  * side know we're still working on it, but don't have any data
 280                  * yet.
 281                  *
 282                  * If we don't have a sideband channel, there's no room in the
 283                  * protocol to say anything, so those clients are just out of
 284                  * luck.
 285                  */
 286                 if (!ret && use_sideband) {
 287                         static const char buf[] = "0005\1";
 288                         write_or_die(1, buf, 5);
 289                 }
 290         }
 291
 292         if (finish_command(&pack_objects)) {
 293                 error("git upload-pack: git-pack-objects died with error.");
 294                 goto fail;
 295         }
 296
 297         /* flush the data */
 298         if (0 <= buffered) {
 299                 data[0] = buffered;
 300                 send_client_data(1, data, 1);
 301                 fprintf(stderr, "flushed.\n");
 302         }
 303         if (use_sideband)
 304                 packet_flush(1);
 305         return;
 306
 307  fail:
 308         send_client_data(3, abort_msg, sizeof(abort_msg));
 309         die("git upload-pack: %s", abort_msg);
 310 }
 311
 312 static int got_oid(const char *hex, struct object_id *oid,
 313                    struct object_array *have_obj)
 314 {
 315         struct object *o;
 316         int we_knew_they_have = 0;
 317
 318         if (get_oid_hex(hex, oid))
 319                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 320         if (!has_object_file(oid))
 321                 return -1;
 322
 323         o = parse_object(the_repository, oid);
 324         if (!o)
 325                 die("oops (%s)", oid_to_hex(oid));
 326         if (o->type == OBJ_COMMIT) {
 327                 struct commit_list *parents;
 328                 struct commit *commit = (struct commit *)o;
 329                 if (o->flags & THEY_HAVE)
 330                         we_knew_they_have = 1;
 331                 else
 332                         o->flags |= THEY_HAVE;
 333                 if (!oldest_have || (commit->date < oldest_have))
 334                         oldest_have = commit->date;
 335                 for (parents = commit->parents;
 336                      parents;
 337                      parents = parents->next)
 338                         parents->item->object.flags |= THEY_HAVE;
 339         }
 340         if (!we_knew_they_have) {
 341                 add_object_array(o, NULL, have_obj);
 342                 return 1;
 343         }
 344         return 0;
 345 }
 346
 347 static int ok_to_give_up(const struct object_array *have_obj,
 348                          struct object_array *want_obj)
 349 {
 350         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 351
 352         if (!have_obj->nr)
 353                 return 0;
 354
 355         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 356                                             COMMON_KNOWN, oldest_have,
 357                                             min_generation);
 358 }
 359
 360 static int get_common_commits(struct packet_reader *reader,
 361                               struct object_array *have_obj,
 362                               struct object_array *want_obj)
 363 {
 364         struct object_id oid;
 365         char last_hex[GIT_MAX_HEXSZ + 1];
 366         int got_common = 0;
 367         int got_other = 0;
 368         int sent_ready = 0;
 369
 370         save_commit_buffer = 0;
 371
 372         for (;;) {
 373                 const char *arg;
 374
 375                 reset_timeout();
 376
 377                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 378                         if (multi_ack == 2 && got_common
 379                             && !got_other && ok_to_give_up(have_obj, want_obj)) {
 380                                 sent_ready = 1;
 381                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 382                         }
 383                         if (have_obj->nr == 0 || multi_ack)
 384                                 packet_write_fmt(1, "NAK\n");
 385
 386                         if (no_done && sent_ready) {
 387                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 388                                 return 0;
 389                         }
 390                         if (stateless_rpc)
 391                                 exit(0);
 392                         got_common = 0;
 393                         got_other = 0;
 394                         continue;
 395                 }
 396                 if (skip_prefix(reader->line, "have ", &arg)) {
 397                         switch (got_oid(arg, &oid, have_obj)) {
 398                         case -1: /* they have what we do not */
 399                                 got_other = 1;
 400                                 if (multi_ack && ok_to_give_up(have_obj, want_obj)) {
 401                                         const char *hex = oid_to_hex(&oid);
 402                                         if (multi_ack == 2) {
 403                                                 sent_ready = 1;
 404                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 405                                         } else
 406                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 407                                 }
 408                                 break;
 409                         default:
 410                                 got_common = 1;
 411                                 oid_to_hex_r(last_hex, &oid);
 412                                 if (multi_ack == 2)
 413                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 414                                 else if (multi_ack)
 415                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 416                                 else if (have_obj->nr == 1)
 417                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 418                                 break;
 419                         }
 420                         continue;
 421                 }
 422                 if (!strcmp(reader->line, "done")) {
 423                         if (have_obj->nr > 0) {
 424                                 if (multi_ack)
 425                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 426                                 return 0;
 427                         }
 428                         packet_write_fmt(1, "NAK\n");
 429                         return -1;
 430                 }
 431                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 432         }
 433 }
 434
 435 static int is_our_ref(struct object *o)
 436 {
 437         int allow_hidden_ref = (allow_unadvertised_object_request &
 438                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 439         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 440 }
 441
 442 /*
 443  * on successful case, it's up to the caller to close cmd->out
 444  */
 445 static int do_reachable_revlist(struct child_process *cmd,
 446                                 struct object_array *src,
 447                                 struct object_array *reachable)
 448 {
 449         static const char *argv[] = {
 450                 "rev-list", "--stdin", NULL,
 451         };
 452         struct object *o;
 453         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 454         int i;
 455         const unsigned hexsz = the_hash_algo->hexsz;
 456
 457         cmd->argv = argv;
 458         cmd->git_cmd = 1;
 459         cmd->no_stderr = 1;
 460         cmd->in = -1;
 461         cmd->out = -1;
 462
 463         /*
 464          * If the next rev-list --stdin encounters an unknown commit,
 465          * it terminates, which will cause SIGPIPE in the write loop
 466          * below.
 467          */
 468         sigchain_push(SIGPIPE, SIG_IGN);
 469
 470         if (start_command(cmd))
 471                 goto error;
 472
 473         namebuf[0] = '^';
 474         namebuf[hexsz + 1] = '\n';
 475         for (i = get_max_object_index(); 0 < i; ) {
 476                 o = get_indexed_object(--i);
 477                 if (!o)
 478                         continue;
 479                 if (reachable && o->type == OBJ_COMMIT)
 480                         o->flags &= ~TMP_MARK;
 481                 if (!is_our_ref(o))
 482                         continue;
 483                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 484                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 485                         goto error;
 486         }
 487         namebuf[hexsz] = '\n';
 488         for (i = 0; i < src->nr; i++) {
 489                 o = src->objects[i].item;
 490                 if (is_our_ref(o)) {
 491                         if (reachable)
 492                                 add_object_array(o, NULL, reachable);
 493                         continue;
 494                 }
 495                 if (reachable && o->type == OBJ_COMMIT)
 496                         o->flags |= TMP_MARK;
 497                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 498                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 499                         goto error;
 500         }
 501         close(cmd->in);
 502         cmd->in = -1;
 503         sigchain_pop(SIGPIPE);
 504
 505         return 0;
 506
 507 error:
 508         sigchain_pop(SIGPIPE);
 509
 510         if (cmd->in >= 0)
 511                 close(cmd->in);
 512         if (cmd->out >= 0)
 513                 close(cmd->out);
 514         return -1;
 515 }
 516
 517 static int get_reachable_list(struct object_array *src,
 518                               struct object_array *reachable)
 519 {
 520         struct child_process cmd = CHILD_PROCESS_INIT;
 521         int i;
 522         struct object *o;
 523         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 524         const unsigned hexsz = the_hash_algo->hexsz;
 525
 526         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 527                 return -1;
 528
 529         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 530                 struct object_id oid;
 531                 const char *p;
 532
 533                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 534                         break;
 535
 536                 o = lookup_object(the_repository, &oid);
 537                 if (o && o->type == OBJ_COMMIT) {
 538                         o->flags &= ~TMP_MARK;
 539                 }
 540         }
 541         for (i = get_max_object_index(); 0 < i; i--) {
 542                 o = get_indexed_object(i - 1);
 543                 if (o && o->type == OBJ_COMMIT &&
 544                     (o->flags & TMP_MARK)) {
 545                         add_object_array(o, NULL, reachable);
 546                                 o->flags &= ~TMP_MARK;
 547                 }
 548         }
 549         close(cmd.out);
 550
 551         if (finish_command(&cmd))
 552                 return -1;
 553
 554         return 0;
 555 }
 556
 557 static int has_unreachable(struct object_array *src)
 558 {
 559         struct child_process cmd = CHILD_PROCESS_INIT;
 560         char buf[1];
 561         int i;
 562
 563         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 564                 return 1;
 565
 566         /*
 567          * The commits out of the rev-list are not ancestors of
 568          * our ref.
 569          */
 570         i = read_in_full(cmd.out, buf, 1);
 571         if (i)
 572                 goto error;
 573         close(cmd.out);
 574         cmd.out = -1;
 575
 576         /*
 577          * rev-list may have died by encountering a bad commit
 578          * in the history, in which case we do want to bail out
 579          * even when it showed no commit.
 580          */
 581         if (finish_command(&cmd))
 582                 goto error;
 583
 584         /* All the non-tip ones are ancestors of what we advertised */
 585         return 0;
 586
 587 error:
 588         sigchain_pop(SIGPIPE);
 589         if (cmd.out >= 0)
 590                 close(cmd.out);
 591         return 1;
 592 }
 593
 594 static void check_non_tip(struct object_array *want_obj,
 595                           struct packet_writer *writer)
 596 {
 597         int i;
 598
 599         /*
 600          * In the normal in-process case without
 601          * uploadpack.allowReachableSHA1InWant,
 602          * non-tip requests can never happen.
 603          */
 604         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 605                 goto error;
 606         if (!has_unreachable(want_obj))
 607                 /* All the non-tip ones are ancestors of what we advertised */
 608                 return;
 609
 610 error:
 611         /* Pick one of them (we know there at least is one) */
 612         for (i = 0; i < want_obj->nr; i++) {
 613                 struct object *o = want_obj->objects[i].item;
 614                 if (!is_our_ref(o)) {
 615                         packet_writer_error(writer,
 616                                             "upload-pack: not our ref %s",
 617                                             oid_to_hex(&o->oid));
 618                         die("git upload-pack: not our ref %s",
 619                             oid_to_hex(&o->oid));
 620                 }
 621         }
 622 }
 623
 624 static void send_shallow(struct packet_writer *writer,
 625                          struct commit_list *result)
 626 {
 627         while (result) {
 628                 struct object *object = &result->item->object;
 629                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 630                         packet_writer_write(writer, "shallow %s",
 631                                             oid_to_hex(&object->oid));
 632                         register_shallow(the_repository, &object->oid);
 633                         shallow_nr++;
 634                 }
 635                 result = result->next;
 636         }
 637 }
 638
 639 static void send_unshallow(struct packet_writer *writer,
 640                            const struct object_array *shallows,
 641                            struct object_array *want_obj)
 642 {
 643         int i;
 644
 645         for (i = 0; i < shallows->nr; i++) {
 646                 struct object *object = shallows->objects[i].item;
 647                 if (object->flags & NOT_SHALLOW) {
 648                         struct commit_list *parents;
 649                         packet_writer_write(writer, "unshallow %s",
 650                                             oid_to_hex(&object->oid));
 651                         object->flags &= ~CLIENT_SHALLOW;
 652                         /*
 653                          * We want to _register_ "object" as shallow, but we
 654                          * also need to traverse object's parents to deepen a
 655                          * shallow clone. Unregister it for now so we can
 656                          * parse and add the parents to the want list, then
 657                          * re-register it.
 658                          */
 659                         unregister_shallow(&object->oid);
 660                         object->parsed = 0;
 661                         parse_commit_or_die((struct commit *)object);
 662                         parents = ((struct commit *)object)->parents;
 663                         while (parents) {
 664                                 add_object_array(&parents->item->object,
 665                                                  NULL, want_obj);
 666                                 parents = parents->next;
 667                         }
 668                         add_object_array(object, NULL, &extra_edge_obj);
 669                 }
 670                 /* make sure commit traversal conforms to client */
 671                 register_shallow(the_repository, &object->oid);
 672         }
 673 }
 674
 675 static int check_ref(const char *refname_full, const struct object_id *oid,
 676                      int flag, void *cb_data);
 677 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
 678                    struct object_array *shallows, struct object_array *want_obj)
 679 {
 680         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 681                 int i;
 682
 683                 for (i = 0; i < shallows->nr; i++) {
 684                         struct object *object = shallows->objects[i].item;
 685                         object->flags |= NOT_SHALLOW;
 686                 }
 687         } else if (deepen_relative) {
 688                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 689                 struct commit_list *result;
 690
 691                 /*
 692                  * Checking for reachable shallows requires that our refs be
 693                  * marked with OUR_REF.
 694                  */
 695                 head_ref_namespaced(check_ref, NULL);
 696                 for_each_namespaced_ref(check_ref, NULL);
 697
 698                 get_reachable_list(shallows, &reachable_shallows);
 699                 result = get_shallow_commits(&reachable_shallows,
 700                                              depth + 1,
 701                                              SHALLOW, NOT_SHALLOW);
 702                 send_shallow(writer, result);
 703                 free_commit_list(result);
 704                 object_array_clear(&reachable_shallows);
 705         } else {
 706                 struct commit_list *result;
 707
 708                 result = get_shallow_commits(want_obj, depth,
 709                                              SHALLOW, NOT_SHALLOW);
 710                 send_shallow(writer, result);
 711                 free_commit_list(result);
 712         }
 713
 714         send_unshallow(writer, shallows, want_obj);
 715 }
 716
 717 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
 718                                const char **av,
 719                                struct object_array *shallows,
 720                                struct object_array *want_obj)
 721 {
 722         struct commit_list *result;
 723
 724         disable_commit_graph(the_repository);
 725         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 726         send_shallow(writer, result);
 727         free_commit_list(result);
 728         send_unshallow(writer, shallows, want_obj);
 729 }
 730
 731 /* Returns 1 if a shallow list is sent or 0 otherwise */
 732 static int send_shallow_list(struct packet_writer *writer,
 733                              int depth, int deepen_rev_list,
 734                              timestamp_t deepen_since,
 735                              struct string_list *deepen_not,
 736                              int deepen_relative,
 737                              struct object_array *shallows,
 738                              struct object_array *want_obj)
 739 {
 740         int ret = 0;
 741
 742         if (depth > 0 && deepen_rev_list)
 743                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 744         if (depth > 0) {
 745                 deepen(writer, depth, deepen_relative, shallows, want_obj);
 746                 ret = 1;
 747         } else if (deepen_rev_list) {
 748                 struct argv_array av = ARGV_ARRAY_INIT;
 749                 int i;
 750
 751                 argv_array_push(&av, "rev-list");
 752                 if (deepen_since)
 753                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 754                 if (deepen_not->nr) {
 755                         argv_array_push(&av, "--not");
 756                         for (i = 0; i < deepen_not->nr; i++) {
 757                                 struct string_list_item *s = deepen_not->items + i;
 758                                 argv_array_push(&av, s->string);
 759                         }
 760                         argv_array_push(&av, "--not");
 761                 }
 762                 for (i = 0; i < want_obj->nr; i++) {
 763                         struct object *o = want_obj->objects[i].item;
 764                         argv_array_push(&av, oid_to_hex(&o->oid));
 765                 }
 766                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
 767                 argv_array_clear(&av);
 768                 ret = 1;
 769         } else {
 770                 if (shallows->nr > 0) {
 771                         int i;
 772                         for (i = 0; i < shallows->nr; i++)
 773                                 register_shallow(the_repository,
 774                                                  &shallows->objects[i].item->oid);
 775                 }
 776         }
 777
 778         shallow_nr += shallows->nr;
 779         return ret;
 780 }
 781
 782 static int process_shallow(const char *line, struct object_array *shallows)
 783 {
 784         const char *arg;
 785         if (skip_prefix(line, "shallow ", &arg)) {
 786                 struct object_id oid;
 787                 struct object *object;
 788                 if (get_oid_hex(arg, &oid))
 789                         die("invalid shallow line: %s", line);
 790                 object = parse_object(the_repository, &oid);
 791                 if (!object)
 792                         return 1;
 793                 if (object->type != OBJ_COMMIT)
 794                         die("invalid shallow object %s", oid_to_hex(&oid));
 795                 if (!(object->flags & CLIENT_SHALLOW)) {
 796                         object->flags |= CLIENT_SHALLOW;
 797                         add_object_array(object, NULL, shallows);
 798                 }
 799                 return 1;
 800         }
 801
 802         return 0;
 803 }
 804
 805 static int process_deepen(const char *line, int *depth)
 806 {
 807         const char *arg;
 808         if (skip_prefix(line, "deepen ", &arg)) {
 809                 char *end = NULL;
 810                 *depth = (int)strtol(arg, &end, 0);
 811                 if (!end || *end || *depth <= 0)
 812                         die("Invalid deepen: %s", line);
 813                 return 1;
 814         }
 815
 816         return 0;
 817 }
 818
 819 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 820 {
 821         const char *arg;
 822         if (skip_prefix(line, "deepen-since ", &arg)) {
 823                 char *end = NULL;
 824                 *deepen_since = parse_timestamp(arg, &end, 0);
 825                 if (!end || *end || !deepen_since ||
 826                     /* revisions.c's max_age -1 is special */
 827                     *deepen_since == -1)
 828                         die("Invalid deepen-since: %s", line);
 829                 *deepen_rev_list = 1;
 830                 return 1;
 831         }
 832         return 0;
 833 }
 834
 835 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 836 {
 837         const char *arg;
 838         if (skip_prefix(line, "deepen-not ", &arg)) {
 839                 char *ref = NULL;
 840                 struct object_id oid;
 841                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 842                         die("git upload-pack: ambiguous deepen-not: %s", line);
 843                 string_list_append(deepen_not, ref);
 844                 free(ref);
 845                 *deepen_rev_list = 1;
 846                 return 1;
 847         }
 848         return 0;
 849 }
 850
 851 static void receive_needs(struct packet_reader *reader, struct object_array *want_obj)
 852 {
 853         struct object_array shallows = OBJECT_ARRAY_INIT;
 854         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 855         int depth = 0;
 856         int has_non_tip = 0;
 857         timestamp_t deepen_since = 0;
 858         int deepen_rev_list = 0;
 859         int deepen_relative = 0;
 860         struct packet_writer writer;
 861
 862         shallow_nr = 0;
 863         packet_writer_init(&writer, 1);
 864         for (;;) {
 865                 struct object *o;
 866                 const char *features;
 867                 struct object_id oid_buf;
 868                 const char *arg;
 869
 870                 reset_timeout();
 871                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 872                         break;
 873
 874                 if (process_shallow(reader->line, &shallows))
 875                         continue;
 876                 if (process_deepen(reader->line, &depth))
 877                         continue;
 878                 if (process_deepen_since(reader->line, &deepen_since, &deepen_rev_list))
 879                         continue;
 880                 if (process_deepen_not(reader->line, &deepen_not, &deepen_rev_list))
 881                         continue;
 882
 883                 if (skip_prefix(reader->line, "filter ", &arg)) {
 884                         if (!filter_capability_requested)
 885                                 die("git upload-pack: filtering capability not negotiated");
 886                         list_objects_filter_die_if_populated(&filter_options);
 887                         parse_list_objects_filter(&filter_options, arg);
 888                         continue;
 889                 }
 890
 891                 if (!skip_prefix(reader->line, "want ", &arg) ||
 892                     parse_oid_hex(arg, &oid_buf, &features))
 893                         die("git upload-pack: protocol error, "
 894                             "expected to get object ID, not '%s'", reader->line);
 895
 896                 if (parse_feature_request(features, "deepen-relative"))
 897                         deepen_relative = 1;
 898                 if (parse_feature_request(features, "multi_ack_detailed"))
 899                         multi_ack = 2;
 900                 else if (parse_feature_request(features, "multi_ack"))
 901                         multi_ack = 1;
 902                 if (parse_feature_request(features, "no-done"))
 903                         no_done = 1;
 904                 if (parse_feature_request(features, "thin-pack"))
 905                         use_thin_pack = 1;
 906                 if (parse_feature_request(features, "ofs-delta"))
 907                         use_ofs_delta = 1;
 908                 if (parse_feature_request(features, "side-band-64k"))
 909                         use_sideband = LARGE_PACKET_MAX;
 910                 else if (parse_feature_request(features, "side-band"))
 911                         use_sideband = DEFAULT_PACKET_MAX;
 912                 if (parse_feature_request(features, "no-progress"))
 913                         no_progress = 1;
 914                 if (parse_feature_request(features, "include-tag"))
 915                         use_include_tag = 1;
 916                 if (allow_filter && parse_feature_request(features, "filter"))
 917                         filter_capability_requested = 1;
 918
 919                 o = parse_object(the_repository, &oid_buf);
 920                 if (!o) {
 921                         packet_writer_error(&writer,
 922                                             "upload-pack: not our ref %s",
 923                                             oid_to_hex(&oid_buf));
 924                         die("git upload-pack: not our ref %s",
 925                             oid_to_hex(&oid_buf));
 926                 }
 927                 if (!(o->flags & WANTED)) {
 928                         o->flags |= WANTED;
 929                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 930                               || is_our_ref(o)))
 931                                 has_non_tip = 1;
 932                         add_object_array(o, NULL, want_obj);
 933                 }
 934         }
 935
 936         /*
 937          * We have sent all our refs already, and the other end
 938          * should have chosen out of them. When we are operating
 939          * in the stateless RPC mode, however, their choice may
 940          * have been based on the set of older refs advertised
 941          * by another process that handled the initial request.
 942          */
 943         if (has_non_tip)
 944                 check_non_tip(want_obj, &writer);
 945
 946         if (!use_sideband && daemon_mode)
 947                 no_progress = 1;
 948
 949         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 950                 return;
 951
 952         if (send_shallow_list(&writer, depth, deepen_rev_list, deepen_since,
 953                               &deepen_not, deepen_relative, &shallows,
 954                               want_obj))
 955                 packet_flush(1);
 956         object_array_clear(&shallows);
 957 }
 958
 959 /* return non-zero if the ref is hidden, otherwise 0 */
 960 static int mark_our_ref(const char *refname, const char *refname_full,
 961                         const struct object_id *oid)
 962 {
 963         struct object *o = lookup_unknown_object(oid);
 964
 965         if (ref_is_hidden(refname, refname_full)) {
 966                 o->flags |= HIDDEN_REF;
 967                 return 1;
 968         }
 969         o->flags |= OUR_REF;
 970         return 0;
 971 }
 972
 973 static int check_ref(const char *refname_full, const struct object_id *oid,
 974                      int flag, void *cb_data)
 975 {
 976         const char *refname = strip_namespace(refname_full);
 977
 978         mark_our_ref(refname, refname_full, oid);
 979         return 0;
 980 }
 981
 982 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 983 {
 984         struct string_list_item *item;
 985
 986         if (!symref->nr)
 987                 return;
 988         for_each_string_list_item(item, symref)
 989                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 990 }
 991
 992 static int send_ref(const char *refname, const struct object_id *oid,
 993                     int flag, void *cb_data)
 994 {
 995         static const char *capabilities = "multi_ack thin-pack side-band"
 996                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 997                 " deepen-relative no-progress include-tag multi_ack_detailed";
 998         const char *refname_nons = strip_namespace(refname);
 999         struct object_id peeled;
1000
1001         if (mark_our_ref(refname_nons, refname, oid))
1002                 return 0;
1003
1004         if (capabilities) {
1005                 struct strbuf symref_info = STRBUF_INIT;
1006
1007                 format_symref_info(&symref_info, cb_data);
1008                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1009                              oid_to_hex(oid), refname_nons,
1010                              0, capabilities,
1011                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1012                                      " allow-tip-sha1-in-want" : "",
1013                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1014                                      " allow-reachable-sha1-in-want" : "",
1015                              stateless_rpc ? " no-done" : "",
1016                              symref_info.buf,
1017                              allow_filter ? " filter" : "",
1018                              git_user_agent_sanitized());
1019                 strbuf_release(&symref_info);
1020         } else {
1021                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1022         }
1023         capabilities = NULL;
1024         if (!peel_ref(refname, &peeled))
1025                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1026         return 0;
1027 }
1028
1029 static int find_symref(const char *refname, const struct object_id *oid,
1030                        int flag, void *cb_data)
1031 {
1032         const char *symref_target;
1033         struct string_list_item *item;
1034
1035         if ((flag & REF_ISSYMREF) == 0)
1036                 return 0;
1037         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1038         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1039                 die("'%s' is a symref but it is not?", refname);
1040         item = string_list_append(cb_data, strip_namespace(refname));
1041         item->util = xstrdup(strip_namespace(symref_target));
1042         return 0;
1043 }
1044
1045 static int upload_pack_config(const char *var, const char *value, void *unused)
1046 {
1047         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1048                 if (git_config_bool(var, value))
1049                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1050                 else
1051                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1052         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1053                 if (git_config_bool(var, value))
1054                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1055                 else
1056                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1057         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1058                 if (git_config_bool(var, value))
1059                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1060                 else
1061                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1062         } else if (!strcmp("uploadpack.keepalive", var)) {
1063                 keepalive = git_config_int(var, value);
1064                 if (!keepalive)
1065                         keepalive = -1;
1066         } else if (!strcmp("uploadpack.allowfilter", var)) {
1067                 allow_filter = git_config_bool(var, value);
1068         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1069                 allow_ref_in_want = git_config_bool(var, value);
1070         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1071                 allow_sideband_all = git_config_bool(var, value);
1072         } else if (!strcmp("core.precomposeunicode", var)) {
1073                 precomposed_unicode = git_config_bool(var, value);
1074         }
1075
1076         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1077         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1078                 if (!strcmp("uploadpack.packobjectshook", var))
1079                         return git_config_string(&pack_objects_hook, var, value);
1080         }
1081
1082         return parse_hide_refs_config(var, value, "uploadpack");
1083 }
1084
1085 void upload_pack(struct upload_pack_options *options)
1086 {
1087         struct string_list symref = STRING_LIST_INIT_DUP;
1088         struct object_array want_obj = OBJECT_ARRAY_INIT;
1089         struct packet_reader reader;
1090
1091         stateless_rpc = options->stateless_rpc;
1092         timeout = options->timeout;
1093         daemon_mode = options->daemon_mode;
1094
1095         git_config(upload_pack_config, NULL);
1096
1097         head_ref_namespaced(find_symref, &symref);
1098
1099         if (options->advertise_refs || !stateless_rpc) {
1100                 reset_timeout();
1101                 head_ref_namespaced(send_ref, &symref);
1102                 for_each_namespaced_ref(send_ref, &symref);
1103                 advertise_shallow_grafts(1);
1104                 packet_flush(1);
1105         } else {
1106                 head_ref_namespaced(check_ref, NULL);
1107                 for_each_namespaced_ref(check_ref, NULL);
1108         }
1109         string_list_clear(&symref, 1);
1110         if (options->advertise_refs)
1111                 return;
1112
1113         packet_reader_init(&reader, 0, NULL, 0,
1114                            PACKET_READ_CHOMP_NEWLINE |
1115                            PACKET_READ_DIE_ON_ERR_PACKET);
1116
1117         receive_needs(&reader, &want_obj);
1118         if (want_obj.nr) {
1119                 struct object_array have_obj = OBJECT_ARRAY_INIT;
1120                 get_common_commits(&reader, &have_obj, &want_obj);
1121                 create_pack_file(&have_obj, &want_obj);
1122         }
1123 }
1124
1125 struct upload_pack_data {
1126         struct object_array wants;
1127         struct string_list wanted_refs;
1128         struct oid_array haves;
1129
1130         struct object_array shallows;
1131         struct string_list deepen_not;
1132         int depth;
1133         timestamp_t deepen_since;
1134         int deepen_rev_list;
1135         int deepen_relative;
1136
1137         struct packet_writer writer;
1138
1139         unsigned stateless_rpc : 1;
1140
1141         unsigned use_thin_pack : 1;
1142         unsigned use_ofs_delta : 1;
1143         unsigned no_progress : 1;
1144         unsigned use_include_tag : 1;
1145         unsigned done : 1;
1146 };
1147
1148 static void upload_pack_data_init(struct upload_pack_data *data)
1149 {
1150         struct object_array wants = OBJECT_ARRAY_INIT;
1151         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1152         struct oid_array haves = OID_ARRAY_INIT;
1153         struct object_array shallows = OBJECT_ARRAY_INIT;
1154         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1155
1156         memset(data, 0, sizeof(*data));
1157         data->wants = wants;
1158         data->wanted_refs = wanted_refs;
1159         data->haves = haves;
1160         data->shallows = shallows;
1161         data->deepen_not = deepen_not;
1162         packet_writer_init(&data->writer, 1);
1163 }
1164
1165 static void upload_pack_data_clear(struct upload_pack_data *data)
1166 {
1167         object_array_clear(&data->wants);
1168         string_list_clear(&data->wanted_refs, 1);
1169         oid_array_clear(&data->haves);
1170         object_array_clear(&data->shallows);
1171         string_list_clear(&data->deepen_not, 0);
1172 }
1173
1174 static int parse_want(struct packet_writer *writer, const char *line,
1175                       struct object_array *want_obj)
1176 {
1177         const char *arg;
1178         if (skip_prefix(line, "want ", &arg)) {
1179                 struct object_id oid;
1180                 struct object *o;
1181
1182                 if (get_oid_hex(arg, &oid))
1183                         die("git upload-pack: protocol error, "
1184                             "expected to get oid, not '%s'", line);
1185
1186                 o = parse_object(the_repository, &oid);
1187                 if (!o) {
1188                         packet_writer_error(writer,
1189                                             "upload-pack: not our ref %s",
1190                                             oid_to_hex(&oid));
1191                         die("git upload-pack: not our ref %s",
1192                             oid_to_hex(&oid));
1193                 }
1194
1195                 if (!(o->flags & WANTED)) {
1196                         o->flags |= WANTED;
1197                         add_object_array(o, NULL, want_obj);
1198                 }
1199
1200                 return 1;
1201         }
1202
1203         return 0;
1204 }
1205
1206 static int parse_want_ref(struct packet_writer *writer, const char *line,
1207                           struct string_list *wanted_refs,
1208                           struct object_array *want_obj)
1209 {
1210         const char *arg;
1211         if (skip_prefix(line, "want-ref ", &arg)) {
1212                 struct object_id oid;
1213                 struct string_list_item *item;
1214                 struct object *o;
1215
1216                 if (read_ref(arg, &oid)) {
1217                         packet_writer_error(writer, "unknown ref %s", arg);
1218                         die("unknown ref %s", arg);
1219                 }
1220
1221                 item = string_list_append(wanted_refs, arg);
1222                 item->util = oiddup(&oid);
1223
1224                 o = parse_object_or_die(&oid, arg);
1225                 if (!(o->flags & WANTED)) {
1226                         o->flags |= WANTED;
1227                         add_object_array(o, NULL, want_obj);
1228                 }
1229
1230                 return 1;
1231         }
1232
1233         return 0;
1234 }
1235
1236 static int parse_have(const char *line, struct oid_array *haves)
1237 {
1238         const char *arg;
1239         if (skip_prefix(line, "have ", &arg)) {
1240                 struct object_id oid;
1241
1242                 if (get_oid_hex(arg, &oid))
1243                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1244                 oid_array_append(haves, &oid);
1245                 return 1;
1246         }
1247
1248         return 0;
1249 }
1250
1251 static void process_args(struct packet_reader *request,
1252                          struct upload_pack_data *data,
1253                          struct object_array *want_obj)
1254 {
1255         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1256                 const char *arg = request->line;
1257                 const char *p;
1258
1259                 /* process want */
1260                 if (parse_want(&data->writer, arg, want_obj))
1261                         continue;
1262                 if (allow_ref_in_want &&
1263                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1264                                    want_obj))
1265                         continue;
1266                 /* process have line */
1267                 if (parse_have(arg, &data->haves))
1268                         continue;
1269
1270                 /* process args like thin-pack */
1271                 if (!strcmp(arg, "thin-pack")) {
1272                         use_thin_pack = 1;
1273                         continue;
1274                 }
1275                 if (!strcmp(arg, "ofs-delta")) {
1276                         use_ofs_delta = 1;
1277                         continue;
1278                 }
1279                 if (!strcmp(arg, "no-progress")) {
1280                         no_progress = 1;
1281                         continue;
1282                 }
1283                 if (!strcmp(arg, "include-tag")) {
1284                         use_include_tag = 1;
1285                         continue;
1286                 }
1287                 if (!strcmp(arg, "done")) {
1288                         data->done = 1;
1289                         continue;
1290                 }
1291
1292                 /* Shallow related arguments */
1293                 if (process_shallow(arg, &data->shallows))
1294                         continue;
1295                 if (process_deepen(arg, &data->depth))
1296                         continue;
1297                 if (process_deepen_since(arg, &data->deepen_since,
1298                                          &data->deepen_rev_list))
1299                         continue;
1300                 if (process_deepen_not(arg, &data->deepen_not,
1301                                        &data->deepen_rev_list))
1302                         continue;
1303                 if (!strcmp(arg, "deepen-relative")) {
1304                         data->deepen_relative = 1;
1305                         continue;
1306                 }
1307
1308                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1309                         list_objects_filter_die_if_populated(&filter_options);
1310                         parse_list_objects_filter(&filter_options, p);
1311                         continue;
1312                 }
1313
1314                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1315                      allow_sideband_all) &&
1316                     !strcmp(arg, "sideband-all")) {
1317                         data->writer.use_sideband = 1;
1318                         continue;
1319                 }
1320
1321                 /* ignore unknown lines maybe? */
1322                 die("unexpected line: '%s'", arg);
1323         }
1324 }
1325
1326 static int process_haves(struct oid_array *haves, struct oid_array *common,
1327                          struct object_array *have_obj)
1328 {
1329         int i;
1330
1331         /* Process haves */
1332         for (i = 0; i < haves->nr; i++) {
1333                 const struct object_id *oid = &haves->oid[i];
1334                 struct object *o;
1335                 int we_knew_they_have = 0;
1336
1337                 if (!has_object_file(oid))
1338                         continue;
1339
1340                 oid_array_append(common, oid);
1341
1342                 o = parse_object(the_repository, oid);
1343                 if (!o)
1344                         die("oops (%s)", oid_to_hex(oid));
1345                 if (o->type == OBJ_COMMIT) {
1346                         struct commit_list *parents;
1347                         struct commit *commit = (struct commit *)o;
1348                         if (o->flags & THEY_HAVE)
1349                                 we_knew_they_have = 1;
1350                         else
1351                                 o->flags |= THEY_HAVE;
1352                         if (!oldest_have || (commit->date < oldest_have))
1353                                 oldest_have = commit->date;
1354                         for (parents = commit->parents;
1355                              parents;
1356                              parents = parents->next)
1357                                 parents->item->object.flags |= THEY_HAVE;
1358                 }
1359                 if (!we_knew_they_have)
1360                         add_object_array(o, NULL, have_obj);
1361         }
1362
1363         return 0;
1364 }
1365
1366 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1367                      const struct object_array *have_obj,
1368                      struct object_array *want_obj)
1369 {
1370         int i;
1371
1372         packet_writer_write(writer, "acknowledgments\n");
1373
1374         /* Send Acks */
1375         if (!acks->nr)
1376                 packet_writer_write(writer, "NAK\n");
1377
1378         for (i = 0; i < acks->nr; i++) {
1379                 packet_writer_write(writer, "ACK %s\n",
1380                                     oid_to_hex(&acks->oid[i]));
1381         }
1382
1383         if (ok_to_give_up(have_obj, want_obj)) {
1384                 /* Send Ready */
1385                 packet_writer_write(writer, "ready\n");
1386                 return 1;
1387         }
1388
1389         return 0;
1390 }
1391
1392 static int process_haves_and_send_acks(struct upload_pack_data *data,
1393                                        struct object_array *have_obj,
1394                                        struct object_array *want_obj)
1395 {
1396         struct oid_array common = OID_ARRAY_INIT;
1397         int ret = 0;
1398
1399         process_haves(&data->haves, &common, have_obj);
1400         if (data->done) {
1401                 ret = 1;
1402         } else if (send_acks(&data->writer, &common, have_obj, want_obj)) {
1403                 packet_writer_delim(&data->writer);
1404                 ret = 1;
1405         } else {
1406                 /* Add Flush */
1407                 packet_writer_flush(&data->writer);
1408                 ret = 0;
1409         }
1410
1411         oid_array_clear(&data->haves);
1412         oid_array_clear(&common);
1413         return ret;
1414 }
1415
1416 static void send_wanted_ref_info(struct upload_pack_data *data)
1417 {
1418         const struct string_list_item *item;
1419
1420         if (!data->wanted_refs.nr)
1421                 return;
1422
1423         packet_writer_write(&data->writer, "wanted-refs\n");
1424
1425         for_each_string_list_item(item, &data->wanted_refs) {
1426                 packet_writer_write(&data->writer, "%s %s\n",
1427                                     oid_to_hex(item->util),
1428                                     item->string);
1429         }
1430
1431         packet_writer_delim(&data->writer);
1432 }
1433
1434 static void send_shallow_info(struct upload_pack_data *data,
1435                               struct object_array *want_obj)
1436 {
1437         /* No shallow info needs to be sent */
1438         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1439             !is_repository_shallow(the_repository))
1440                 return;
1441
1442         packet_writer_write(&data->writer, "shallow-info\n");
1443
1444         if (!send_shallow_list(&data->writer, data->depth,
1445                                data->deepen_rev_list,
1446                                data->deepen_since, &data->deepen_not,
1447                                data->deepen_relative,
1448                                &data->shallows, want_obj) &&
1449             is_repository_shallow(the_repository))
1450                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1451                        &data->shallows, want_obj);
1452
1453         packet_delim(1);
1454 }
1455
1456 enum fetch_state {
1457         FETCH_PROCESS_ARGS = 0,
1458         FETCH_SEND_ACKS,
1459         FETCH_SEND_PACK,
1460         FETCH_DONE,
1461 };
1462
1463 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1464                    struct packet_reader *request)
1465 {
1466         enum fetch_state state = FETCH_PROCESS_ARGS;
1467         struct upload_pack_data data;
1468         struct object_array have_obj = OBJECT_ARRAY_INIT;
1469         struct object_array want_obj = OBJECT_ARRAY_INIT;
1470
1471         clear_object_flags(ALL_FLAGS);
1472
1473         git_config(upload_pack_config, NULL);
1474
1475         upload_pack_data_init(&data);
1476         use_sideband = LARGE_PACKET_MAX;
1477
1478         while (state != FETCH_DONE) {
1479                 switch (state) {
1480                 case FETCH_PROCESS_ARGS:
1481                         process_args(request, &data, &want_obj);
1482
1483                         if (!want_obj.nr) {
1484                                 /*
1485                                  * Request didn't contain any 'want' lines,
1486                                  * guess they didn't want anything.
1487                                  */
1488                                 state = FETCH_DONE;
1489                         } else if (data.haves.nr) {
1490                                 /*
1491                                  * Request had 'have' lines, so lets ACK them.
1492                                  */
1493                                 state = FETCH_SEND_ACKS;
1494                         } else {
1495                                 /*
1496                                  * Request had 'want's but no 'have's so we can
1497                                  * immedietly go to construct and send a pack.
1498                                  */
1499                                 state = FETCH_SEND_PACK;
1500                         }
1501                         break;
1502                 case FETCH_SEND_ACKS:
1503                         if (process_haves_and_send_acks(&data, &have_obj,
1504                                                         &want_obj))
1505                                 state = FETCH_SEND_PACK;
1506                         else
1507                                 state = FETCH_DONE;
1508                         break;
1509                 case FETCH_SEND_PACK:
1510                         send_wanted_ref_info(&data);
1511                         send_shallow_info(&data, &want_obj);
1512
1513                         packet_writer_write(&data.writer, "packfile\n");
1514                         create_pack_file(&have_obj, &want_obj);
1515                         state = FETCH_DONE;
1516                         break;
1517                 case FETCH_DONE:
1518                         continue;
1519                 }
1520         }
1521
1522         upload_pack_data_clear(&data);
1523         object_array_clear(&have_obj);
1524         object_array_clear(&want_obj);
1525         return 0;
1526 }
1527
1528 int upload_pack_advertise(struct repository *r,
1529                           struct strbuf *value)
1530 {
1531         if (value) {
1532                 int allow_filter_value;
1533                 int allow_ref_in_want;
1534                 int allow_sideband_all_value;
1535
1536                 strbuf_addstr(value, "shallow");
1537
1538                 if (!repo_config_get_bool(the_repository,
1539                                          "uploadpack.allowfilter",
1540                                          &allow_filter_value) &&
1541                     allow_filter_value)
1542                         strbuf_addstr(value, " filter");
1543
1544                 if (!repo_config_get_bool(the_repository,
1545                                          "uploadpack.allowrefinwant",
1546                                          &allow_ref_in_want) &&
1547                     allow_ref_in_want)
1548                         strbuf_addstr(value, " ref-in-want");
1549
1550                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1551                     (!repo_config_get_bool(the_repository,
1552                                            "uploadpack.allowsidebandall",
1553                                            &allow_sideband_all_value) &&
1554                      allow_sideband_all_value))
1555                         strbuf_addstr(value, " sideband-all");
1556         }
1557
1558         return 1;
1559 }