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 "tag.h"
   7 #include "object.h"
   8 #include "commit.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "list-objects.h"
  12 #include "list-objects-filter.h"
  13 #include "list-objects-filter-options.h"
  14 #include "run-command.h"
  15 #include "connect.h"
  16 #include "sigchain.h"
  17 #include "version.h"
  18 #include "string-list.h"
  19 #include "argv-array.h"
  20 #include "prio-queue.h"
  21 #include "protocol.h"
  22 #include "quote.h"
  23 #include "upload-pack.h"
  24 #include "serve.h"
  25
  26 /* Remember to update object flag allocation in object.h */
  27 #define THEY_HAVE       (1u << 11)
  28 #define OUR_REF         (1u << 12)
  29 #define WANTED          (1u << 13)
  30 #define COMMON_KNOWN    (1u << 14)
  31 #define REACHABLE       (1u << 15)
  32
  33 #define SHALLOW         (1u << 16)
  34 #define NOT_SHALLOW     (1u << 17)
  35 #define CLIENT_SHALLOW  (1u << 18)
  36 #define HIDDEN_REF      (1u << 19)
  37
  38 static timestamp_t oldest_have;
  39
  40 static int deepen_relative;
  41 static int multi_ack;
  42 static int no_done;
  43 static int use_thin_pack, use_ofs_delta, use_include_tag;
  44 static int no_progress, daemon_mode;
  45 /* Allow specifying sha1 if it is a ref tip. */
  46 #define ALLOW_TIP_SHA1  01
  47 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  48 #define ALLOW_REACHABLE_SHA1    02
  49 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  50 #define ALLOW_ANY_SHA1  07
  51 static unsigned int allow_unadvertised_object_request;
  52 static int shallow_nr;
  53 static struct object_array have_obj;
  54 static struct object_array want_obj;
  55 static struct object_array extra_edge_obj;
  56 static unsigned int timeout;
  57 static int keepalive = 5;
  58 /* 0 for no sideband,
  59  * otherwise maximum packet size (up to 65520 bytes).
  60  */
  61 static int use_sideband;
  62 static int stateless_rpc;
  63 static const char *pack_objects_hook;
  64
  65 static int filter_capability_requested;
  66 static int allow_filter;
  67 static struct list_objects_filter_options filter_options;
  68
  69 static void reset_timeout(void)
  70 {
  71         alarm(timeout);
  72 }
  73
  74 static void send_client_data(int fd, const char *data, ssize_t sz)
  75 {
  76         if (use_sideband) {
  77                 send_sideband(1, fd, data, sz, use_sideband);
  78                 return;
  79         }
  80         if (fd == 3)
  81                 /* emergency quit */
  82                 fd = 2;
  83         if (fd == 2) {
  84                 /* XXX: are we happy to lose stuff here? */
  85                 xwrite(fd, data, sz);
  86                 return;
  87         }
  88         write_or_die(fd, data, sz);
  89 }
  90
  91 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  92 {
  93         FILE *fp = cb_data;
  94         if (graft->nr_parent == -1)
  95                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  96         return 0;
  97 }
  98
  99 static void create_pack_file(void)
 100 {
 101         struct child_process pack_objects = CHILD_PROCESS_INIT;
 102         char data[8193], progress[128];
 103         char abort_msg[] = "aborting due to possible repository "
 104                 "corruption on the remote side.";
 105         int buffered = -1;
 106         ssize_t sz;
 107         int i;
 108         FILE *pipe_fd;
 109
 110         if (!pack_objects_hook)
 111                 pack_objects.git_cmd = 1;
 112         else {
 113                 argv_array_push(&pack_objects.args, pack_objects_hook);
 114                 argv_array_push(&pack_objects.args, "git");
 115                 pack_objects.use_shell = 1;
 116         }
 117
 118         if (shallow_nr) {
 119                 argv_array_push(&pack_objects.args, "--shallow-file");
 120                 argv_array_push(&pack_objects.args, "");
 121         }
 122         argv_array_push(&pack_objects.args, "pack-objects");
 123         argv_array_push(&pack_objects.args, "--revs");
 124         if (use_thin_pack)
 125                 argv_array_push(&pack_objects.args, "--thin");
 126
 127         argv_array_push(&pack_objects.args, "--stdout");
 128         if (shallow_nr)
 129                 argv_array_push(&pack_objects.args, "--shallow");
 130         if (!no_progress)
 131                 argv_array_push(&pack_objects.args, "--progress");
 132         if (use_ofs_delta)
 133                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 134         if (use_include_tag)
 135                 argv_array_push(&pack_objects.args, "--include-tag");
 136         if (filter_options.filter_spec) {
 137                 if (pack_objects.use_shell) {
 138                         struct strbuf buf = STRBUF_INIT;
 139                         sq_quote_buf(&buf, filter_options.filter_spec);
 140                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 141                         strbuf_release(&buf);
 142                 } else {
 143                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 144                                          filter_options.filter_spec);
 145                 }
 146         }
 147
 148         pack_objects.in = -1;
 149         pack_objects.out = -1;
 150         pack_objects.err = -1;
 151
 152         if (start_command(&pack_objects))
 153                 die("git upload-pack: unable to fork git-pack-objects");
 154
 155         pipe_fd = xfdopen(pack_objects.in, "w");
 156
 157         if (shallow_nr)
 158                 for_each_commit_graft(write_one_shallow, pipe_fd);
 159
 160         for (i = 0; i < want_obj.nr; i++)
 161                 fprintf(pipe_fd, "%s\n",
 162                         oid_to_hex(&want_obj.objects[i].item->oid));
 163         fprintf(pipe_fd, "--not\n");
 164         for (i = 0; i < have_obj.nr; i++)
 165                 fprintf(pipe_fd, "%s\n",
 166                         oid_to_hex(&have_obj.objects[i].item->oid));
 167         for (i = 0; i < extra_edge_obj.nr; i++)
 168                 fprintf(pipe_fd, "%s\n",
 169                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 170         fprintf(pipe_fd, "\n");
 171         fflush(pipe_fd);
 172         fclose(pipe_fd);
 173
 174         /* We read from pack_objects.err to capture stderr output for
 175          * progress bar, and pack_objects.out to capture the pack data.
 176          */
 177
 178         while (1) {
 179                 struct pollfd pfd[2];
 180                 int pe, pu, pollsize;
 181                 int ret;
 182
 183                 reset_timeout();
 184
 185                 pollsize = 0;
 186                 pe = pu = -1;
 187
 188                 if (0 <= pack_objects.out) {
 189                         pfd[pollsize].fd = pack_objects.out;
 190                         pfd[pollsize].events = POLLIN;
 191                         pu = pollsize;
 192                         pollsize++;
 193                 }
 194                 if (0 <= pack_objects.err) {
 195                         pfd[pollsize].fd = pack_objects.err;
 196                         pfd[pollsize].events = POLLIN;
 197                         pe = pollsize;
 198                         pollsize++;
 199                 }
 200
 201                 if (!pollsize)
 202                         break;
 203
 204                 ret = poll(pfd, pollsize,
 205                         keepalive < 0 ? -1 : 1000 * keepalive);
 206
 207                 if (ret < 0) {
 208                         if (errno != EINTR) {
 209                                 error_errno("poll failed, resuming");
 210                                 sleep(1);
 211                         }
 212                         continue;
 213                 }
 214                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 215                         /* Status ready; we ship that in the side-band
 216                          * or dump to the standard error.
 217                          */
 218                         sz = xread(pack_objects.err, progress,
 219                                   sizeof(progress));
 220                         if (0 < sz)
 221                                 send_client_data(2, progress, sz);
 222                         else if (sz == 0) {
 223                                 close(pack_objects.err);
 224                                 pack_objects.err = -1;
 225                         }
 226                         else
 227                                 goto fail;
 228                         /* give priority to status messages */
 229                         continue;
 230                 }
 231                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 232                         /* Data ready; we keep the last byte to ourselves
 233                          * in case we detect broken rev-list, so that we
 234                          * can leave the stream corrupted.  This is
 235                          * unfortunate -- unpack-objects would happily
 236                          * accept a valid packdata with trailing garbage,
 237                          * so appending garbage after we pass all the
 238                          * pack data is not good enough to signal
 239                          * breakage to downstream.
 240                          */
 241                         char *cp = data;
 242                         ssize_t outsz = 0;
 243                         if (0 <= buffered) {
 244                                 *cp++ = buffered;
 245                                 outsz++;
 246                         }
 247                         sz = xread(pack_objects.out, cp,
 248                                   sizeof(data) - outsz);
 249                         if (0 < sz)
 250                                 ;
 251                         else if (sz == 0) {
 252                                 close(pack_objects.out);
 253                                 pack_objects.out = -1;
 254                         }
 255                         else
 256                                 goto fail;
 257                         sz += outsz;
 258                         if (1 < sz) {
 259                                 buffered = data[sz-1] & 0xFF;
 260                                 sz--;
 261                         }
 262                         else
 263                                 buffered = -1;
 264                         send_client_data(1, data, sz);
 265                 }
 266
 267                 /*
 268                  * We hit the keepalive timeout without saying anything; send
 269                  * an empty message on the data sideband just to let the other
 270                  * side know we're still working on it, but don't have any data
 271                  * yet.
 272                  *
 273                  * If we don't have a sideband channel, there's no room in the
 274                  * protocol to say anything, so those clients are just out of
 275                  * luck.
 276                  */
 277                 if (!ret && use_sideband) {
 278                         static const char buf[] = "0005\1";
 279                         write_or_die(1, buf, 5);
 280                 }
 281         }
 282
 283         if (finish_command(&pack_objects)) {
 284                 error("git upload-pack: git-pack-objects died with error.");
 285                 goto fail;
 286         }
 287
 288         /* flush the data */
 289         if (0 <= buffered) {
 290                 data[0] = buffered;
 291                 send_client_data(1, data, 1);
 292                 fprintf(stderr, "flushed.\n");
 293         }
 294         if (use_sideband)
 295                 packet_flush(1);
 296         return;
 297
 298  fail:
 299         send_client_data(3, abort_msg, sizeof(abort_msg));
 300         die("git upload-pack: %s", abort_msg);
 301 }
 302
 303 static int got_oid(const char *hex, struct object_id *oid)
 304 {
 305         struct object *o;
 306         int we_knew_they_have = 0;
 307
 308         if (get_oid_hex(hex, oid))
 309                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 310         if (!has_object_file(oid))
 311                 return -1;
 312
 313         o = parse_object(oid);
 314         if (!o)
 315                 die("oops (%s)", oid_to_hex(oid));
 316         if (o->type == OBJ_COMMIT) {
 317                 struct commit_list *parents;
 318                 struct commit *commit = (struct commit *)o;
 319                 if (o->flags & THEY_HAVE)
 320                         we_knew_they_have = 1;
 321                 else
 322                         o->flags |= THEY_HAVE;
 323                 if (!oldest_have || (commit->date < oldest_have))
 324                         oldest_have = commit->date;
 325                 for (parents = commit->parents;
 326                      parents;
 327                      parents = parents->next)
 328                         parents->item->object.flags |= THEY_HAVE;
 329         }
 330         if (!we_knew_they_have) {
 331                 add_object_array(o, NULL, &have_obj);
 332                 return 1;
 333         }
 334         return 0;
 335 }
 336
 337 static int reachable(struct commit *want)
 338 {
 339         struct prio_queue work = { compare_commits_by_commit_date };
 340
 341         prio_queue_put(&work, want);
 342         while (work.nr) {
 343                 struct commit_list *list;
 344                 struct commit *commit = prio_queue_get(&work);
 345
 346                 if (commit->object.flags & THEY_HAVE) {
 347                         want->object.flags |= COMMON_KNOWN;
 348                         break;
 349                 }
 350                 if (!commit->object.parsed)
 351                         parse_object(&commit->object.oid);
 352                 if (commit->object.flags & REACHABLE)
 353                         continue;
 354                 commit->object.flags |= REACHABLE;
 355                 if (commit->date < oldest_have)
 356                         continue;
 357                 for (list = commit->parents; list; list = list->next) {
 358                         struct commit *parent = list->item;
 359                         if (!(parent->object.flags & REACHABLE))
 360                                 prio_queue_put(&work, parent);
 361                 }
 362         }
 363         want->object.flags |= REACHABLE;
 364         clear_commit_marks(want, REACHABLE);
 365         clear_prio_queue(&work);
 366         return (want->object.flags & COMMON_KNOWN);
 367 }
 368
 369 static int ok_to_give_up(void)
 370 {
 371         int i;
 372
 373         if (!have_obj.nr)
 374                 return 0;
 375
 376         for (i = 0; i < want_obj.nr; i++) {
 377                 struct object *want = want_obj.objects[i].item;
 378
 379                 if (want->flags & COMMON_KNOWN)
 380                         continue;
 381                 want = deref_tag(want, "a want line", 0);
 382                 if (!want || want->type != OBJ_COMMIT) {
 383                         /* no way to tell if this is reachable by
 384                          * looking at the ancestry chain alone, so
 385                          * leave a note to ourselves not to worry about
 386                          * this object anymore.
 387                          */
 388                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 389                         continue;
 390                 }
 391                 if (!reachable((struct commit *)want))
 392                         return 0;
 393         }
 394         return 1;
 395 }
 396
 397 static int get_common_commits(void)
 398 {
 399         struct object_id oid;
 400         char last_hex[GIT_MAX_HEXSZ + 1];
 401         int got_common = 0;
 402         int got_other = 0;
 403         int sent_ready = 0;
 404
 405         save_commit_buffer = 0;
 406
 407         for (;;) {
 408                 char *line = packet_read_line(0, NULL);
 409                 const char *arg;
 410
 411                 reset_timeout();
 412
 413                 if (!line) {
 414                         if (multi_ack == 2 && got_common
 415                             && !got_other && ok_to_give_up()) {
 416                                 sent_ready = 1;
 417                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 418                         }
 419                         if (have_obj.nr == 0 || multi_ack)
 420                                 packet_write_fmt(1, "NAK\n");
 421
 422                         if (no_done && sent_ready) {
 423                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 424                                 return 0;
 425                         }
 426                         if (stateless_rpc)
 427                                 exit(0);
 428                         got_common = 0;
 429                         got_other = 0;
 430                         continue;
 431                 }
 432                 if (skip_prefix(line, "have ", &arg)) {
 433                         switch (got_oid(arg, &oid)) {
 434                         case -1: /* they have what we do not */
 435                                 got_other = 1;
 436                                 if (multi_ack && ok_to_give_up()) {
 437                                         const char *hex = oid_to_hex(&oid);
 438                                         if (multi_ack == 2) {
 439                                                 sent_ready = 1;
 440                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 441                                         } else
 442                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 443                                 }
 444                                 break;
 445                         default:
 446                                 got_common = 1;
 447                                 memcpy(last_hex, oid_to_hex(&oid), 41);
 448                                 if (multi_ack == 2)
 449                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 450                                 else if (multi_ack)
 451                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 452                                 else if (have_obj.nr == 1)
 453                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 454                                 break;
 455                         }
 456                         continue;
 457                 }
 458                 if (!strcmp(line, "done")) {
 459                         if (have_obj.nr > 0) {
 460                                 if (multi_ack)
 461                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 462                                 return 0;
 463                         }
 464                         packet_write_fmt(1, "NAK\n");
 465                         return -1;
 466                 }
 467                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 468         }
 469 }
 470
 471 static int is_our_ref(struct object *o)
 472 {
 473         int allow_hidden_ref = (allow_unadvertised_object_request &
 474                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 475         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 476 }
 477
 478 /*
 479  * on successful case, it's up to the caller to close cmd->out
 480  */
 481 static int do_reachable_revlist(struct child_process *cmd,
 482                                 struct object_array *src,
 483                                 struct object_array *reachable)
 484 {
 485         static const char *argv[] = {
 486                 "rev-list", "--stdin", NULL,
 487         };
 488         struct object *o;
 489         char namebuf[42]; /* ^ + SHA-1 + LF */
 490         int i;
 491
 492         cmd->argv = argv;
 493         cmd->git_cmd = 1;
 494         cmd->no_stderr = 1;
 495         cmd->in = -1;
 496         cmd->out = -1;
 497
 498         /*
 499          * If the next rev-list --stdin encounters an unknown commit,
 500          * it terminates, which will cause SIGPIPE in the write loop
 501          * below.
 502          */
 503         sigchain_push(SIGPIPE, SIG_IGN);
 504
 505         if (start_command(cmd))
 506                 goto error;
 507
 508         namebuf[0] = '^';
 509         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 510         for (i = get_max_object_index(); 0 < i; ) {
 511                 o = get_indexed_object(--i);
 512                 if (!o)
 513                         continue;
 514                 if (reachable && o->type == OBJ_COMMIT)
 515                         o->flags &= ~TMP_MARK;
 516                 if (!is_our_ref(o))
 517                         continue;
 518                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 519                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 520                         goto error;
 521         }
 522         namebuf[GIT_SHA1_HEXSZ] = '\n';
 523         for (i = 0; i < src->nr; i++) {
 524                 o = src->objects[i].item;
 525                 if (is_our_ref(o)) {
 526                         if (reachable)
 527                                 add_object_array(o, NULL, reachable);
 528                         continue;
 529                 }
 530                 if (reachable && o->type == OBJ_COMMIT)
 531                         o->flags |= TMP_MARK;
 532                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 533                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 534                         goto error;
 535         }
 536         close(cmd->in);
 537         cmd->in = -1;
 538         sigchain_pop(SIGPIPE);
 539
 540         return 0;
 541
 542 error:
 543         sigchain_pop(SIGPIPE);
 544
 545         if (cmd->in >= 0)
 546                 close(cmd->in);
 547         if (cmd->out >= 0)
 548                 close(cmd->out);
 549         return -1;
 550 }
 551
 552 static int get_reachable_list(struct object_array *src,
 553                               struct object_array *reachable)
 554 {
 555         struct child_process cmd = CHILD_PROCESS_INIT;
 556         int i;
 557         struct object *o;
 558         char namebuf[42]; /* ^ + SHA-1 + LF */
 559
 560         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 561                 return -1;
 562
 563         while ((i = read_in_full(cmd.out, namebuf, 41)) == 41) {
 564                 struct object_id sha1;
 565
 566                 if (namebuf[40] != '\n' || get_oid_hex(namebuf, &sha1))
 567                         break;
 568
 569                 o = lookup_object(sha1.hash);
 570                 if (o && o->type == OBJ_COMMIT) {
 571                         o->flags &= ~TMP_MARK;
 572                 }
 573         }
 574         for (i = get_max_object_index(); 0 < i; i--) {
 575                 o = get_indexed_object(i - 1);
 576                 if (o && o->type == OBJ_COMMIT &&
 577                     (o->flags & TMP_MARK)) {
 578                         add_object_array(o, NULL, reachable);
 579                                 o->flags &= ~TMP_MARK;
 580                 }
 581         }
 582         close(cmd.out);
 583
 584         if (finish_command(&cmd))
 585                 return -1;
 586
 587         return 0;
 588 }
 589
 590 static int has_unreachable(struct object_array *src)
 591 {
 592         struct child_process cmd = CHILD_PROCESS_INIT;
 593         char buf[1];
 594         int i;
 595
 596         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 597                 return 1;
 598
 599         /*
 600          * The commits out of the rev-list are not ancestors of
 601          * our ref.
 602          */
 603         i = read_in_full(cmd.out, buf, 1);
 604         if (i)
 605                 goto error;
 606         close(cmd.out);
 607         cmd.out = -1;
 608
 609         /*
 610          * rev-list may have died by encountering a bad commit
 611          * in the history, in which case we do want to bail out
 612          * even when it showed no commit.
 613          */
 614         if (finish_command(&cmd))
 615                 goto error;
 616
 617         /* All the non-tip ones are ancestors of what we advertised */
 618         return 0;
 619
 620 error:
 621         sigchain_pop(SIGPIPE);
 622         if (cmd.out >= 0)
 623                 close(cmd.out);
 624         return 1;
 625 }
 626
 627 static void check_non_tip(void)
 628 {
 629         int i;
 630
 631         /*
 632          * In the normal in-process case without
 633          * uploadpack.allowReachableSHA1InWant,
 634          * non-tip requests can never happen.
 635          */
 636         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 637                 goto error;
 638         if (!has_unreachable(&want_obj))
 639                 /* All the non-tip ones are ancestors of what we advertised */
 640                 return;
 641
 642 error:
 643         /* Pick one of them (we know there at least is one) */
 644         for (i = 0; i < want_obj.nr; i++) {
 645                 struct object *o = want_obj.objects[i].item;
 646                 if (!is_our_ref(o))
 647                         die("git upload-pack: not our ref %s",
 648                             oid_to_hex(&o->oid));
 649         }
 650 }
 651
 652 static void send_shallow(struct commit_list *result)
 653 {
 654         while (result) {
 655                 struct object *object = &result->item->object;
 656                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 657                         packet_write_fmt(1, "shallow %s",
 658                                          oid_to_hex(&object->oid));
 659                         register_shallow(&object->oid);
 660                         shallow_nr++;
 661                 }
 662                 result = result->next;
 663         }
 664 }
 665
 666 static void send_unshallow(const struct object_array *shallows)
 667 {
 668         int i;
 669
 670         for (i = 0; i < shallows->nr; i++) {
 671                 struct object *object = shallows->objects[i].item;
 672                 if (object->flags & NOT_SHALLOW) {
 673                         struct commit_list *parents;
 674                         packet_write_fmt(1, "unshallow %s",
 675                                          oid_to_hex(&object->oid));
 676                         object->flags &= ~CLIENT_SHALLOW;
 677                         /*
 678                          * We want to _register_ "object" as shallow, but we
 679                          * also need to traverse object's parents to deepen a
 680                          * shallow clone. Unregister it for now so we can
 681                          * parse and add the parents to the want list, then
 682                          * re-register it.
 683                          */
 684                         unregister_shallow(&object->oid);
 685                         object->parsed = 0;
 686                         parse_commit_or_die((struct commit *)object);
 687                         parents = ((struct commit *)object)->parents;
 688                         while (parents) {
 689                                 add_object_array(&parents->item->object,
 690                                                  NULL, &want_obj);
 691                                 parents = parents->next;
 692                         }
 693                         add_object_array(object, NULL, &extra_edge_obj);
 694                 }
 695                 /* make sure commit traversal conforms to client */
 696                 register_shallow(&object->oid);
 697         }
 698 }
 699
 700 static void deepen(int depth, int deepen_relative,
 701                    struct object_array *shallows)
 702 {
 703         if (depth == INFINITE_DEPTH && !is_repository_shallow()) {
 704                 int i;
 705
 706                 for (i = 0; i < shallows->nr; i++) {
 707                         struct object *object = shallows->objects[i].item;
 708                         object->flags |= NOT_SHALLOW;
 709                 }
 710         } else if (deepen_relative) {
 711                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 712                 struct commit_list *result;
 713
 714                 get_reachable_list(shallows, &reachable_shallows);
 715                 result = get_shallow_commits(&reachable_shallows,
 716                                              depth + 1,
 717                                              SHALLOW, NOT_SHALLOW);
 718                 send_shallow(result);
 719                 free_commit_list(result);
 720                 object_array_clear(&reachable_shallows);
 721         } else {
 722                 struct commit_list *result;
 723
 724                 result = get_shallow_commits(&want_obj, depth,
 725                                              SHALLOW, NOT_SHALLOW);
 726                 send_shallow(result);
 727                 free_commit_list(result);
 728         }
 729
 730         send_unshallow(shallows);
 731 }
 732
 733 static void deepen_by_rev_list(int ac, const char **av,
 734                                struct object_array *shallows)
 735 {
 736         struct commit_list *result;
 737
 738         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 739         send_shallow(result);
 740         free_commit_list(result);
 741         send_unshallow(shallows);
 742 }
 743
 744 /* Returns 1 if a shallow list is sent or 0 otherwise */
 745 static int send_shallow_list(int depth, int deepen_rev_list,
 746                              timestamp_t deepen_since,
 747                              struct string_list *deepen_not,
 748                              struct object_array *shallows)
 749 {
 750         int ret = 0;
 751
 752         if (depth > 0 && deepen_rev_list)
 753                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 754         if (depth > 0) {
 755                 deepen(depth, deepen_relative, shallows);
 756                 ret = 1;
 757         } else if (deepen_rev_list) {
 758                 struct argv_array av = ARGV_ARRAY_INIT;
 759                 int i;
 760
 761                 argv_array_push(&av, "rev-list");
 762                 if (deepen_since)
 763                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 764                 if (deepen_not->nr) {
 765                         argv_array_push(&av, "--not");
 766                         for (i = 0; i < deepen_not->nr; i++) {
 767                                 struct string_list_item *s = deepen_not->items + i;
 768                                 argv_array_push(&av, s->string);
 769                         }
 770                         argv_array_push(&av, "--not");
 771                 }
 772                 for (i = 0; i < want_obj.nr; i++) {
 773                         struct object *o = want_obj.objects[i].item;
 774                         argv_array_push(&av, oid_to_hex(&o->oid));
 775                 }
 776                 deepen_by_rev_list(av.argc, av.argv, shallows);
 777                 argv_array_clear(&av);
 778                 ret = 1;
 779         } else {
 780                 if (shallows->nr > 0) {
 781                         int i;
 782                         for (i = 0; i < shallows->nr; i++)
 783                                 register_shallow(&shallows->objects[i].item->oid);
 784                 }
 785         }
 786
 787         shallow_nr += shallows->nr;
 788         return ret;
 789 }
 790
 791 static int process_shallow(const char *line, struct object_array *shallows)
 792 {
 793         const char *arg;
 794         if (skip_prefix(line, "shallow ", &arg)) {
 795                 struct object_id oid;
 796                 struct object *object;
 797                 if (get_oid_hex(arg, &oid))
 798                         die("invalid shallow line: %s", line);
 799                 object = parse_object(&oid);
 800                 if (!object)
 801                         return 1;
 802                 if (object->type != OBJ_COMMIT)
 803                         die("invalid shallow object %s", oid_to_hex(&oid));
 804                 if (!(object->flags & CLIENT_SHALLOW)) {
 805                         object->flags |= CLIENT_SHALLOW;
 806                         add_object_array(object, NULL, shallows);
 807                 }
 808                 return 1;
 809         }
 810
 811         return 0;
 812 }
 813
 814 static int process_deepen(const char *line, int *depth)
 815 {
 816         const char *arg;
 817         if (skip_prefix(line, "deepen ", &arg)) {
 818                 char *end = NULL;
 819                 *depth = (int)strtol(arg, &end, 0);
 820                 if (!end || *end || *depth <= 0)
 821                         die("Invalid deepen: %s", line);
 822                 return 1;
 823         }
 824
 825         return 0;
 826 }
 827
 828 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 829 {
 830         const char *arg;
 831         if (skip_prefix(line, "deepen-since ", &arg)) {
 832                 char *end = NULL;
 833                 *deepen_since = parse_timestamp(arg, &end, 0);
 834                 if (!end || *end || !deepen_since ||
 835                     /* revisions.c's max_age -1 is special */
 836                     *deepen_since == -1)
 837                         die("Invalid deepen-since: %s", line);
 838                 *deepen_rev_list = 1;
 839                 return 1;
 840         }
 841         return 0;
 842 }
 843
 844 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 845 {
 846         const char *arg;
 847         if (skip_prefix(line, "deepen-not ", &arg)) {
 848                 char *ref = NULL;
 849                 struct object_id oid;
 850                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 851                         die("git upload-pack: ambiguous deepen-not: %s", line);
 852                 string_list_append(deepen_not, ref);
 853                 free(ref);
 854                 *deepen_rev_list = 1;
 855                 return 1;
 856         }
 857         return 0;
 858 }
 859
 860 static void receive_needs(void)
 861 {
 862         struct object_array shallows = OBJECT_ARRAY_INIT;
 863         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 864         int depth = 0;
 865         int has_non_tip = 0;
 866         timestamp_t deepen_since = 0;
 867         int deepen_rev_list = 0;
 868
 869         shallow_nr = 0;
 870         for (;;) {
 871                 struct object *o;
 872                 const char *features;
 873                 struct object_id oid_buf;
 874                 char *line = packet_read_line(0, NULL);
 875                 const char *arg;
 876
 877                 reset_timeout();
 878                 if (!line)
 879                         break;
 880
 881                 if (process_shallow(line, &shallows))
 882                         continue;
 883                 if (process_deepen(line, &depth))
 884                         continue;
 885                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 886                         continue;
 887                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 888                         continue;
 889
 890                 if (skip_prefix(line, "filter ", &arg)) {
 891                         if (!filter_capability_requested)
 892                                 die("git upload-pack: filtering capability not negotiated");
 893                         parse_list_objects_filter(&filter_options, arg);
 894                         continue;
 895                 }
 896
 897                 if (!skip_prefix(line, "want ", &arg) ||
 898                     get_oid_hex(arg, &oid_buf))
 899                         die("git upload-pack: protocol error, "
 900                             "expected to get sha, not '%s'", line);
 901
 902                 features = arg + 40;
 903
 904                 if (parse_feature_request(features, "deepen-relative"))
 905                         deepen_relative = 1;
 906                 if (parse_feature_request(features, "multi_ack_detailed"))
 907                         multi_ack = 2;
 908                 else if (parse_feature_request(features, "multi_ack"))
 909                         multi_ack = 1;
 910                 if (parse_feature_request(features, "no-done"))
 911                         no_done = 1;
 912                 if (parse_feature_request(features, "thin-pack"))
 913                         use_thin_pack = 1;
 914                 if (parse_feature_request(features, "ofs-delta"))
 915                         use_ofs_delta = 1;
 916                 if (parse_feature_request(features, "side-band-64k"))
 917                         use_sideband = LARGE_PACKET_MAX;
 918                 else if (parse_feature_request(features, "side-band"))
 919                         use_sideband = DEFAULT_PACKET_MAX;
 920                 if (parse_feature_request(features, "no-progress"))
 921                         no_progress = 1;
 922                 if (parse_feature_request(features, "include-tag"))
 923                         use_include_tag = 1;
 924                 if (allow_filter && parse_feature_request(features, "filter"))
 925                         filter_capability_requested = 1;
 926
 927                 o = parse_object(&oid_buf);
 928                 if (!o) {
 929                         packet_write_fmt(1,
 930                                          "ERR upload-pack: not our ref %s",
 931                                          oid_to_hex(&oid_buf));
 932                         die("git upload-pack: not our ref %s",
 933                             oid_to_hex(&oid_buf));
 934                 }
 935                 if (!(o->flags & WANTED)) {
 936                         o->flags |= WANTED;
 937                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 938                               || is_our_ref(o)))
 939                                 has_non_tip = 1;
 940                         add_object_array(o, NULL, &want_obj);
 941                 }
 942         }
 943
 944         /*
 945          * We have sent all our refs already, and the other end
 946          * should have chosen out of them. When we are operating
 947          * in the stateless RPC mode, however, their choice may
 948          * have been based on the set of older refs advertised
 949          * by another process that handled the initial request.
 950          */
 951         if (has_non_tip)
 952                 check_non_tip();
 953
 954         if (!use_sideband && daemon_mode)
 955                 no_progress = 1;
 956
 957         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 958                 return;
 959
 960         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 961                               &deepen_not, &shallows))
 962                 packet_flush(1);
 963         object_array_clear(&shallows);
 964 }
 965
 966 /* return non-zero if the ref is hidden, otherwise 0 */
 967 static int mark_our_ref(const char *refname, const char *refname_full,
 968                         const struct object_id *oid)
 969 {
 970         struct object *o = lookup_unknown_object(oid->hash);
 971
 972         if (ref_is_hidden(refname, refname_full)) {
 973                 o->flags |= HIDDEN_REF;
 974                 return 1;
 975         }
 976         o->flags |= OUR_REF;
 977         return 0;
 978 }
 979
 980 static int check_ref(const char *refname_full, const struct object_id *oid,
 981                      int flag, void *cb_data)
 982 {
 983         const char *refname = strip_namespace(refname_full);
 984
 985         mark_our_ref(refname, refname_full, oid);
 986         return 0;
 987 }
 988
 989 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 990 {
 991         struct string_list_item *item;
 992
 993         if (!symref->nr)
 994                 return;
 995         for_each_string_list_item(item, symref)
 996                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 997 }
 998
 999 static int send_ref(const char *refname, const struct object_id *oid,
1000                     int flag, void *cb_data)
1001 {
1002         static const char *capabilities = "multi_ack thin-pack side-band"
1003                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1004                 " deepen-relative no-progress include-tag multi_ack_detailed";
1005         const char *refname_nons = strip_namespace(refname);
1006         struct object_id peeled;
1007
1008         if (mark_our_ref(refname_nons, refname, oid))
1009                 return 0;
1010
1011         if (capabilities) {
1012                 struct strbuf symref_info = STRBUF_INIT;
1013
1014                 format_symref_info(&symref_info, cb_data);
1015                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1016                              oid_to_hex(oid), refname_nons,
1017                              0, capabilities,
1018                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1019                                      " allow-tip-sha1-in-want" : "",
1020                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1021                                      " allow-reachable-sha1-in-want" : "",
1022                              stateless_rpc ? " no-done" : "",
1023                              symref_info.buf,
1024                              allow_filter ? " filter" : "",
1025                              git_user_agent_sanitized());
1026                 strbuf_release(&symref_info);
1027         } else {
1028                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1029         }
1030         capabilities = NULL;
1031         if (!peel_ref(refname, &peeled))
1032                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1033         return 0;
1034 }
1035
1036 static int find_symref(const char *refname, const struct object_id *oid,
1037                        int flag, void *cb_data)
1038 {
1039         const char *symref_target;
1040         struct string_list_item *item;
1041
1042         if ((flag & REF_ISSYMREF) == 0)
1043                 return 0;
1044         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1045         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1046                 die("'%s' is a symref but it is not?", refname);
1047         item = string_list_append(cb_data, refname);
1048         item->util = xstrdup(symref_target);
1049         return 0;
1050 }
1051
1052 static int upload_pack_config(const char *var, const char *value, void *unused)
1053 {
1054         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1055                 if (git_config_bool(var, value))
1056                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1057                 else
1058                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1059         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1060                 if (git_config_bool(var, value))
1061                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1062                 else
1063                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1064         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1065                 if (git_config_bool(var, value))
1066                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1067                 else
1068                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1069         } else if (!strcmp("uploadpack.keepalive", var)) {
1070                 keepalive = git_config_int(var, value);
1071                 if (!keepalive)
1072                         keepalive = -1;
1073         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1074                 if (!strcmp("uploadpack.packobjectshook", var))
1075                         return git_config_string(&pack_objects_hook, var, value);
1076         } else if (!strcmp("uploadpack.allowfilter", var)) {
1077                 allow_filter = git_config_bool(var, value);
1078         }
1079         return parse_hide_refs_config(var, value, "uploadpack");
1080 }
1081
1082 void upload_pack(struct upload_pack_options *options)
1083 {
1084         struct string_list symref = STRING_LIST_INIT_DUP;
1085
1086         stateless_rpc = options->stateless_rpc;
1087         timeout = options->timeout;
1088         daemon_mode = options->daemon_mode;
1089
1090         git_config(upload_pack_config, NULL);
1091
1092         head_ref_namespaced(find_symref, &symref);
1093
1094         if (options->advertise_refs || !stateless_rpc) {
1095                 reset_timeout();
1096                 head_ref_namespaced(send_ref, &symref);
1097                 for_each_namespaced_ref(send_ref, &symref);
1098                 advertise_shallow_grafts(1);
1099                 packet_flush(1);
1100         } else {
1101                 head_ref_namespaced(check_ref, NULL);
1102                 for_each_namespaced_ref(check_ref, NULL);
1103         }
1104         string_list_clear(&symref, 1);
1105         if (options->advertise_refs)
1106                 return;
1107
1108         receive_needs();
1109         if (want_obj.nr) {
1110                 get_common_commits();
1111                 create_pack_file();
1112         }
1113 }
1114
1115 struct upload_pack_data {
1116         struct object_array wants;
1117         struct oid_array haves;
1118
1119         struct object_array shallows;
1120         struct string_list deepen_not;
1121         int depth;
1122         timestamp_t deepen_since;
1123         int deepen_rev_list;
1124         int deepen_relative;
1125
1126         unsigned stateless_rpc : 1;
1127
1128         unsigned use_thin_pack : 1;
1129         unsigned use_ofs_delta : 1;
1130         unsigned no_progress : 1;
1131         unsigned use_include_tag : 1;
1132         unsigned done : 1;
1133 };
1134
1135 static void upload_pack_data_init(struct upload_pack_data *data)
1136 {
1137         struct object_array wants = OBJECT_ARRAY_INIT;
1138         struct oid_array haves = OID_ARRAY_INIT;
1139         struct object_array shallows = OBJECT_ARRAY_INIT;
1140         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1141
1142         memset(data, 0, sizeof(*data));
1143         data->wants = wants;
1144         data->haves = haves;
1145         data->shallows = shallows;
1146         data->deepen_not = deepen_not;
1147 }
1148
1149 static void upload_pack_data_clear(struct upload_pack_data *data)
1150 {
1151         object_array_clear(&data->wants);
1152         oid_array_clear(&data->haves);
1153         object_array_clear(&data->shallows);
1154         string_list_clear(&data->deepen_not, 0);
1155 }
1156
1157 static int parse_want(const char *line)
1158 {
1159         const char *arg;
1160         if (skip_prefix(line, "want ", &arg)) {
1161                 struct object_id oid;
1162                 struct object *o;
1163
1164                 if (get_oid_hex(arg, &oid))
1165                         die("git upload-pack: protocol error, "
1166                             "expected to get oid, not '%s'", line);
1167
1168                 o = parse_object(&oid);
1169                 if (!o) {
1170                         packet_write_fmt(1,
1171                                          "ERR upload-pack: not our ref %s",
1172                                          oid_to_hex(&oid));
1173                         die("git upload-pack: not our ref %s",
1174                             oid_to_hex(&oid));
1175                 }
1176
1177                 if (!(o->flags & WANTED)) {
1178                         o->flags |= WANTED;
1179                         add_object_array(o, NULL, &want_obj);
1180                 }
1181
1182                 return 1;
1183         }
1184
1185         return 0;
1186 }
1187
1188 static int parse_have(const char *line, struct oid_array *haves)
1189 {
1190         const char *arg;
1191         if (skip_prefix(line, "have ", &arg)) {
1192                 struct object_id oid;
1193
1194                 if (get_oid_hex(arg, &oid))
1195                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1196                 oid_array_append(haves, &oid);
1197                 return 1;
1198         }
1199
1200         return 0;
1201 }
1202
1203 static void process_args(struct packet_reader *request,
1204                          struct upload_pack_data *data)
1205 {
1206         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1207                 const char *arg = request->line;
1208
1209                 /* process want */
1210                 if (parse_want(arg))
1211                         continue;
1212                 /* process have line */
1213                 if (parse_have(arg, &data->haves))
1214                         continue;
1215
1216                 /* process args like thin-pack */
1217                 if (!strcmp(arg, "thin-pack")) {
1218                         use_thin_pack = 1;
1219                         continue;
1220                 }
1221                 if (!strcmp(arg, "ofs-delta")) {
1222                         use_ofs_delta = 1;
1223                         continue;
1224                 }
1225                 if (!strcmp(arg, "no-progress")) {
1226                         no_progress = 1;
1227                         continue;
1228                 }
1229                 if (!strcmp(arg, "include-tag")) {
1230                         use_include_tag = 1;
1231                         continue;
1232                 }
1233                 if (!strcmp(arg, "done")) {
1234                         data->done = 1;
1235                         continue;
1236                 }
1237
1238                 /* Shallow related arguments */
1239                 if (process_shallow(arg, &data->shallows))
1240                         continue;
1241                 if (process_deepen(arg, &data->depth))
1242                         continue;
1243                 if (process_deepen_since(arg, &data->deepen_since,
1244                                          &data->deepen_rev_list))
1245                         continue;
1246                 if (process_deepen_not(arg, &data->deepen_not,
1247                                        &data->deepen_rev_list))
1248                         continue;
1249                 if (!strcmp(arg, "deepen-relative")) {
1250                         data->deepen_relative = 1;
1251                         continue;
1252                 }
1253
1254                 /* ignore unknown lines maybe? */
1255                 die("unexpect line: '%s'", arg);
1256         }
1257 }
1258
1259 static int process_haves(struct oid_array *haves, struct oid_array *common)
1260 {
1261         int i;
1262
1263         /* Process haves */
1264         for (i = 0; i < haves->nr; i++) {
1265                 const struct object_id *oid = &haves->oid[i];
1266                 struct object *o;
1267                 int we_knew_they_have = 0;
1268
1269                 if (!has_object_file(oid))
1270                         continue;
1271
1272                 oid_array_append(common, oid);
1273
1274                 o = parse_object(oid);
1275                 if (!o)
1276                         die("oops (%s)", oid_to_hex(oid));
1277                 if (o->type == OBJ_COMMIT) {
1278                         struct commit_list *parents;
1279                         struct commit *commit = (struct commit *)o;
1280                         if (o->flags & THEY_HAVE)
1281                                 we_knew_they_have = 1;
1282                         else
1283                                 o->flags |= THEY_HAVE;
1284                         if (!oldest_have || (commit->date < oldest_have))
1285                                 oldest_have = commit->date;
1286                         for (parents = commit->parents;
1287                              parents;
1288                              parents = parents->next)
1289                                 parents->item->object.flags |= THEY_HAVE;
1290                 }
1291                 if (!we_knew_they_have)
1292                         add_object_array(o, NULL, &have_obj);
1293         }
1294
1295         return 0;
1296 }
1297
1298 static int send_acks(struct oid_array *acks, struct strbuf *response)
1299 {
1300         int i;
1301
1302         packet_buf_write(response, "acknowledgments\n");
1303
1304         /* Send Acks */
1305         if (!acks->nr)
1306                 packet_buf_write(response, "NAK\n");
1307
1308         for (i = 0; i < acks->nr; i++) {
1309                 packet_buf_write(response, "ACK %s\n",
1310                                  oid_to_hex(&acks->oid[i]));
1311         }
1312
1313         if (ok_to_give_up()) {
1314                 /* Send Ready */
1315                 packet_buf_write(response, "ready\n");
1316                 return 1;
1317         }
1318
1319         return 0;
1320 }
1321
1322 static int process_haves_and_send_acks(struct upload_pack_data *data)
1323 {
1324         struct oid_array common = OID_ARRAY_INIT;
1325         struct strbuf response = STRBUF_INIT;
1326         int ret = 0;
1327
1328         process_haves(&data->haves, &common);
1329         if (data->done) {
1330                 ret = 1;
1331         } else if (send_acks(&common, &response)) {
1332                 packet_buf_delim(&response);
1333                 ret = 1;
1334         } else {
1335                 /* Add Flush */
1336                 packet_buf_flush(&response);
1337                 ret = 0;
1338         }
1339
1340         /* Send response */
1341         write_or_die(1, response.buf, response.len);
1342         strbuf_release(&response);
1343
1344         oid_array_clear(&data->haves);
1345         oid_array_clear(&common);
1346         return ret;
1347 }
1348
1349 static void send_shallow_info(struct upload_pack_data *data)
1350 {
1351         /* No shallow info needs to be sent */
1352         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1353             !is_repository_shallow())
1354                 return;
1355
1356         packet_write_fmt(1, "shallow-info\n");
1357
1358         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1359                                data->deepen_since, &data->deepen_not,
1360                                &data->shallows) && is_repository_shallow())
1361                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
1362
1363         packet_delim(1);
1364 }
1365
1366 enum fetch_state {
1367         FETCH_PROCESS_ARGS = 0,
1368         FETCH_SEND_ACKS,
1369         FETCH_SEND_PACK,
1370         FETCH_DONE,
1371 };
1372
1373 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1374                    struct packet_reader *request)
1375 {
1376         enum fetch_state state = FETCH_PROCESS_ARGS;
1377         struct upload_pack_data data;
1378
1379         upload_pack_data_init(&data);
1380         use_sideband = LARGE_PACKET_MAX;
1381
1382         while (state != FETCH_DONE) {
1383                 switch (state) {
1384                 case FETCH_PROCESS_ARGS:
1385                         process_args(request, &data);
1386
1387                         if (!want_obj.nr) {
1388                                 /*
1389                                  * Request didn't contain any 'want' lines,
1390                                  * guess they didn't want anything.
1391                                  */
1392                                 state = FETCH_DONE;
1393                         } else if (data.haves.nr) {
1394                                 /*
1395                                  * Request had 'have' lines, so lets ACK them.
1396                                  */
1397                                 state = FETCH_SEND_ACKS;
1398                         } else {
1399                                 /*
1400                                  * Request had 'want's but no 'have's so we can
1401                                  * immedietly go to construct and send a pack.
1402                                  */
1403                                 state = FETCH_SEND_PACK;
1404                         }
1405                         break;
1406                 case FETCH_SEND_ACKS:
1407                         if (process_haves_and_send_acks(&data))
1408                                 state = FETCH_SEND_PACK;
1409                         else
1410                                 state = FETCH_DONE;
1411                         break;
1412                 case FETCH_SEND_PACK:
1413                         send_shallow_info(&data);
1414
1415                         packet_write_fmt(1, "packfile\n");
1416                         create_pack_file();
1417                         state = FETCH_DONE;
1418                         break;
1419                 case FETCH_DONE:
1420                         continue;
1421                 }
1422         }
1423
1424         upload_pack_data_clear(&data);
1425         return 0;
1426 }
1427
1428 int upload_pack_advertise(struct repository *r,
1429                           struct strbuf *value)
1430 {
1431         if (value)
1432                 strbuf_addstr(value, "shallow");
1433         return 1;
1434 }