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-reach.h"
  28
  29 /* Remember to update object flag allocation in object.h */
  30 #define THEY_HAVE       (1u << 11)
  31 #define OUR_REF         (1u << 12)
  32 #define WANTED          (1u << 13)
  33 #define COMMON_KNOWN    (1u << 14)
  34
  35 #define SHALLOW         (1u << 16)
  36 #define NOT_SHALLOW     (1u << 17)
  37 #define CLIENT_SHALLOW  (1u << 18)
  38 #define HIDDEN_REF      (1u << 19)
  39
  40 static timestamp_t oldest_have;
  41
  42 static int deepen_relative;
  43 static int multi_ack;
  44 static int no_done;
  45 static int use_thin_pack, use_ofs_delta, use_include_tag;
  46 static int no_progress, daemon_mode;
  47 /* Allow specifying sha1 if it is a ref tip. */
  48 #define ALLOW_TIP_SHA1  01
  49 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  50 #define ALLOW_REACHABLE_SHA1    02
  51 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  52 #define ALLOW_ANY_SHA1  07
  53 static unsigned int allow_unadvertised_object_request;
  54 static int shallow_nr;
  55 static struct object_array have_obj;
  56 static struct object_array want_obj;
  57 static struct object_array extra_edge_obj;
  58 static unsigned int timeout;
  59 static int keepalive = 5;
  60 /* 0 for no sideband,
  61  * otherwise maximum packet size (up to 65520 bytes).
  62  */
  63 static int use_sideband;
  64 static int stateless_rpc;
  65 static const char *pack_objects_hook;
  66
  67 static int filter_capability_requested;
  68 static int allow_filter;
  69 static int allow_ref_in_want;
  70 static struct list_objects_filter_options filter_options;
  71
  72 static void reset_timeout(void)
  73 {
  74         alarm(timeout);
  75 }
  76
  77 static void send_client_data(int fd, const char *data, ssize_t sz)
  78 {
  79         if (use_sideband) {
  80                 send_sideband(1, fd, data, sz, use_sideband);
  81                 return;
  82         }
  83         if (fd == 3)
  84                 /* emergency quit */
  85                 fd = 2;
  86         if (fd == 2) {
  87                 /* XXX: are we happy to lose stuff here? */
  88                 xwrite(fd, data, sz);
  89                 return;
  90         }
  91         write_or_die(fd, data, sz);
  92 }
  93
  94 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  95 {
  96         FILE *fp = cb_data;
  97         if (graft->nr_parent == -1)
  98                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  99         return 0;
 100 }
 101
 102 static void create_pack_file(void)
 103 {
 104         struct child_process pack_objects = CHILD_PROCESS_INIT;
 105         char data[8193], progress[128];
 106         char abort_msg[] = "aborting due to possible repository "
 107                 "corruption on the remote side.";
 108         int buffered = -1;
 109         ssize_t sz;
 110         int i;
 111         FILE *pipe_fd;
 112
 113         if (!pack_objects_hook)
 114                 pack_objects.git_cmd = 1;
 115         else {
 116                 argv_array_push(&pack_objects.args, pack_objects_hook);
 117                 argv_array_push(&pack_objects.args, "git");
 118                 pack_objects.use_shell = 1;
 119         }
 120
 121         if (shallow_nr) {
 122                 argv_array_push(&pack_objects.args, "--shallow-file");
 123                 argv_array_push(&pack_objects.args, "");
 124         }
 125         argv_array_push(&pack_objects.args, "pack-objects");
 126         argv_array_push(&pack_objects.args, "--revs");
 127         if (use_thin_pack)
 128                 argv_array_push(&pack_objects.args, "--thin");
 129
 130         argv_array_push(&pack_objects.args, "--stdout");
 131         if (shallow_nr)
 132                 argv_array_push(&pack_objects.args, "--shallow");
 133         if (!no_progress)
 134                 argv_array_push(&pack_objects.args, "--progress");
 135         if (use_ofs_delta)
 136                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 137         if (use_include_tag)
 138                 argv_array_push(&pack_objects.args, "--include-tag");
 139         if (filter_options.filter_spec) {
 140                 if (pack_objects.use_shell) {
 141                         struct strbuf buf = STRBUF_INIT;
 142                         sq_quote_buf(&buf, filter_options.filter_spec);
 143                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 144                         strbuf_release(&buf);
 145                 } else {
 146                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 147                                          filter_options.filter_spec);
 148                 }
 149         }
 150
 151         pack_objects.in = -1;
 152         pack_objects.out = -1;
 153         pack_objects.err = -1;
 154
 155         if (start_command(&pack_objects))
 156                 die("git upload-pack: unable to fork git-pack-objects");
 157
 158         pipe_fd = xfdopen(pack_objects.in, "w");
 159
 160         if (shallow_nr)
 161                 for_each_commit_graft(write_one_shallow, pipe_fd);
 162
 163         for (i = 0; i < want_obj.nr; i++)
 164                 fprintf(pipe_fd, "%s\n",
 165                         oid_to_hex(&want_obj.objects[i].item->oid));
 166         fprintf(pipe_fd, "--not\n");
 167         for (i = 0; i < have_obj.nr; i++)
 168                 fprintf(pipe_fd, "%s\n",
 169                         oid_to_hex(&have_obj.objects[i].item->oid));
 170         for (i = 0; i < extra_edge_obj.nr; i++)
 171                 fprintf(pipe_fd, "%s\n",
 172                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 173         fprintf(pipe_fd, "\n");
 174         fflush(pipe_fd);
 175         fclose(pipe_fd);
 176
 177         /* We read from pack_objects.err to capture stderr output for
 178          * progress bar, and pack_objects.out to capture the pack data.
 179          */
 180
 181         while (1) {
 182                 struct pollfd pfd[2];
 183                 int pe, pu, pollsize;
 184                 int ret;
 185
 186                 reset_timeout();
 187
 188                 pollsize = 0;
 189                 pe = pu = -1;
 190
 191                 if (0 <= pack_objects.out) {
 192                         pfd[pollsize].fd = pack_objects.out;
 193                         pfd[pollsize].events = POLLIN;
 194                         pu = pollsize;
 195                         pollsize++;
 196                 }
 197                 if (0 <= pack_objects.err) {
 198                         pfd[pollsize].fd = pack_objects.err;
 199                         pfd[pollsize].events = POLLIN;
 200                         pe = pollsize;
 201                         pollsize++;
 202                 }
 203
 204                 if (!pollsize)
 205                         break;
 206
 207                 ret = poll(pfd, pollsize,
 208                         keepalive < 0 ? -1 : 1000 * keepalive);
 209
 210                 if (ret < 0) {
 211                         if (errno != EINTR) {
 212                                 error_errno("poll failed, resuming");
 213                                 sleep(1);
 214                         }
 215                         continue;
 216                 }
 217                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 218                         /* Status ready; we ship that in the side-band
 219                          * or dump to the standard error.
 220                          */
 221                         sz = xread(pack_objects.err, progress,
 222                                   sizeof(progress));
 223                         if (0 < sz)
 224                                 send_client_data(2, progress, sz);
 225                         else if (sz == 0) {
 226                                 close(pack_objects.err);
 227                                 pack_objects.err = -1;
 228                         }
 229                         else
 230                                 goto fail;
 231                         /* give priority to status messages */
 232                         continue;
 233                 }
 234                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 235                         /* Data ready; we keep the last byte to ourselves
 236                          * in case we detect broken rev-list, so that we
 237                          * can leave the stream corrupted.  This is
 238                          * unfortunate -- unpack-objects would happily
 239                          * accept a valid packdata with trailing garbage,
 240                          * so appending garbage after we pass all the
 241                          * pack data is not good enough to signal
 242                          * breakage to downstream.
 243                          */
 244                         char *cp = data;
 245                         ssize_t outsz = 0;
 246                         if (0 <= buffered) {
 247                                 *cp++ = buffered;
 248                                 outsz++;
 249                         }
 250                         sz = xread(pack_objects.out, cp,
 251                                   sizeof(data) - outsz);
 252                         if (0 < sz)
 253                                 ;
 254                         else if (sz == 0) {
 255                                 close(pack_objects.out);
 256                                 pack_objects.out = -1;
 257                         }
 258                         else
 259                                 goto fail;
 260                         sz += outsz;
 261                         if (1 < sz) {
 262                                 buffered = data[sz-1] & 0xFF;
 263                                 sz--;
 264                         }
 265                         else
 266                                 buffered = -1;
 267                         send_client_data(1, data, sz);
 268                 }
 269
 270                 /*
 271                  * We hit the keepalive timeout without saying anything; send
 272                  * an empty message on the data sideband just to let the other
 273                  * side know we're still working on it, but don't have any data
 274                  * yet.
 275                  *
 276                  * If we don't have a sideband channel, there's no room in the
 277                  * protocol to say anything, so those clients are just out of
 278                  * luck.
 279                  */
 280                 if (!ret && use_sideband) {
 281                         static const char buf[] = "0005\1";
 282                         write_or_die(1, buf, 5);
 283                 }
 284         }
 285
 286         if (finish_command(&pack_objects)) {
 287                 error("git upload-pack: git-pack-objects died with error.");
 288                 goto fail;
 289         }
 290
 291         /* flush the data */
 292         if (0 <= buffered) {
 293                 data[0] = buffered;
 294                 send_client_data(1, data, 1);
 295                 fprintf(stderr, "flushed.\n");
 296         }
 297         if (use_sideband)
 298                 packet_flush(1);
 299         return;
 300
 301  fail:
 302         send_client_data(3, abort_msg, sizeof(abort_msg));
 303         die("git upload-pack: %s", abort_msg);
 304 }
 305
 306 static int got_oid(const char *hex, struct object_id *oid)
 307 {
 308         struct object *o;
 309         int we_knew_they_have = 0;
 310
 311         if (get_oid_hex(hex, oid))
 312                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 313         if (!has_object_file(oid))
 314                 return -1;
 315
 316         o = parse_object(the_repository, oid);
 317         if (!o)
 318                 die("oops (%s)", oid_to_hex(oid));
 319         if (o->type == OBJ_COMMIT) {
 320                 struct commit_list *parents;
 321                 struct commit *commit = (struct commit *)o;
 322                 if (o->flags & THEY_HAVE)
 323                         we_knew_they_have = 1;
 324                 else
 325                         o->flags |= THEY_HAVE;
 326                 if (!oldest_have || (commit->date < oldest_have))
 327                         oldest_have = commit->date;
 328                 for (parents = commit->parents;
 329                      parents;
 330                      parents = parents->next)
 331                         parents->item->object.flags |= THEY_HAVE;
 332         }
 333         if (!we_knew_they_have) {
 334                 add_object_array(o, NULL, &have_obj);
 335                 return 1;
 336         }
 337         return 0;
 338 }
 339
 340 static int ok_to_give_up(void)
 341 {
 342         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 343
 344         if (!have_obj.nr)
 345                 return 0;
 346
 347         return can_all_from_reach_with_flag(&want_obj, THEY_HAVE,
 348                                             COMMON_KNOWN, oldest_have,
 349                                             min_generation);
 350 }
 351
 352 static int get_common_commits(void)
 353 {
 354         struct object_id oid;
 355         char last_hex[GIT_MAX_HEXSZ + 1];
 356         int got_common = 0;
 357         int got_other = 0;
 358         int sent_ready = 0;
 359
 360         save_commit_buffer = 0;
 361
 362         for (;;) {
 363                 char *line = packet_read_line(0, NULL);
 364                 const char *arg;
 365
 366                 reset_timeout();
 367
 368                 if (!line) {
 369                         if (multi_ack == 2 && got_common
 370                             && !got_other && ok_to_give_up()) {
 371                                 sent_ready = 1;
 372                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 373                         }
 374                         if (have_obj.nr == 0 || multi_ack)
 375                                 packet_write_fmt(1, "NAK\n");
 376
 377                         if (no_done && sent_ready) {
 378                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 379                                 return 0;
 380                         }
 381                         if (stateless_rpc)
 382                                 exit(0);
 383                         got_common = 0;
 384                         got_other = 0;
 385                         continue;
 386                 }
 387                 if (skip_prefix(line, "have ", &arg)) {
 388                         switch (got_oid(arg, &oid)) {
 389                         case -1: /* they have what we do not */
 390                                 got_other = 1;
 391                                 if (multi_ack && ok_to_give_up()) {
 392                                         const char *hex = oid_to_hex(&oid);
 393                                         if (multi_ack == 2) {
 394                                                 sent_ready = 1;
 395                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 396                                         } else
 397                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 398                                 }
 399                                 break;
 400                         default:
 401                                 got_common = 1;
 402                                 oid_to_hex_r(last_hex, &oid);
 403                                 if (multi_ack == 2)
 404                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 405                                 else if (multi_ack)
 406                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 407                                 else if (have_obj.nr == 1)
 408                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 409                                 break;
 410                         }
 411                         continue;
 412                 }
 413                 if (!strcmp(line, "done")) {
 414                         if (have_obj.nr > 0) {
 415                                 if (multi_ack)
 416                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 417                                 return 0;
 418                         }
 419                         packet_write_fmt(1, "NAK\n");
 420                         return -1;
 421                 }
 422                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 423         }
 424 }
 425
 426 static int is_our_ref(struct object *o)
 427 {
 428         int allow_hidden_ref = (allow_unadvertised_object_request &
 429                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 430         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 431 }
 432
 433 /*
 434  * on successful case, it's up to the caller to close cmd->out
 435  */
 436 static int do_reachable_revlist(struct child_process *cmd,
 437                                 struct object_array *src,
 438                                 struct object_array *reachable)
 439 {
 440         static const char *argv[] = {
 441                 "rev-list", "--stdin", NULL,
 442         };
 443         struct object *o;
 444         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 445         int i;
 446
 447         cmd->argv = argv;
 448         cmd->git_cmd = 1;
 449         cmd->no_stderr = 1;
 450         cmd->in = -1;
 451         cmd->out = -1;
 452
 453         /*
 454          * If the next rev-list --stdin encounters an unknown commit,
 455          * it terminates, which will cause SIGPIPE in the write loop
 456          * below.
 457          */
 458         sigchain_push(SIGPIPE, SIG_IGN);
 459
 460         if (start_command(cmd))
 461                 goto error;
 462
 463         namebuf[0] = '^';
 464         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 465         for (i = get_max_object_index(); 0 < i; ) {
 466                 o = get_indexed_object(--i);
 467                 if (!o)
 468                         continue;
 469                 if (reachable && o->type == OBJ_COMMIT)
 470                         o->flags &= ~TMP_MARK;
 471                 if (!is_our_ref(o))
 472                         continue;
 473                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 474                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 475                         goto error;
 476         }
 477         namebuf[GIT_SHA1_HEXSZ] = '\n';
 478         for (i = 0; i < src->nr; i++) {
 479                 o = src->objects[i].item;
 480                 if (is_our_ref(o)) {
 481                         if (reachable)
 482                                 add_object_array(o, NULL, reachable);
 483                         continue;
 484                 }
 485                 if (reachable && o->type == OBJ_COMMIT)
 486                         o->flags |= TMP_MARK;
 487                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 488                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 489                         goto error;
 490         }
 491         close(cmd->in);
 492         cmd->in = -1;
 493         sigchain_pop(SIGPIPE);
 494
 495         return 0;
 496
 497 error:
 498         sigchain_pop(SIGPIPE);
 499
 500         if (cmd->in >= 0)
 501                 close(cmd->in);
 502         if (cmd->out >= 0)
 503                 close(cmd->out);
 504         return -1;
 505 }
 506
 507 static int get_reachable_list(struct object_array *src,
 508                               struct object_array *reachable)
 509 {
 510         struct child_process cmd = CHILD_PROCESS_INIT;
 511         int i;
 512         struct object *o;
 513         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 514         const unsigned hexsz = the_hash_algo->hexsz;
 515
 516         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 517                 return -1;
 518
 519         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 520                 struct object_id sha1;
 521                 const char *p;
 522
 523                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 524                         break;
 525
 526                 o = lookup_object(the_repository, sha1.hash);
 527                 if (o && o->type == OBJ_COMMIT) {
 528                         o->flags &= ~TMP_MARK;
 529                 }
 530         }
 531         for (i = get_max_object_index(); 0 < i; i--) {
 532                 o = get_indexed_object(i - 1);
 533                 if (o && o->type == OBJ_COMMIT &&
 534                     (o->flags & TMP_MARK)) {
 535                         add_object_array(o, NULL, reachable);
 536                                 o->flags &= ~TMP_MARK;
 537                 }
 538         }
 539         close(cmd.out);
 540
 541         if (finish_command(&cmd))
 542                 return -1;
 543
 544         return 0;
 545 }
 546
 547 static int has_unreachable(struct object_array *src)
 548 {
 549         struct child_process cmd = CHILD_PROCESS_INIT;
 550         char buf[1];
 551         int i;
 552
 553         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 554                 return 1;
 555
 556         /*
 557          * The commits out of the rev-list are not ancestors of
 558          * our ref.
 559          */
 560         i = read_in_full(cmd.out, buf, 1);
 561         if (i)
 562                 goto error;
 563         close(cmd.out);
 564         cmd.out = -1;
 565
 566         /*
 567          * rev-list may have died by encountering a bad commit
 568          * in the history, in which case we do want to bail out
 569          * even when it showed no commit.
 570          */
 571         if (finish_command(&cmd))
 572                 goto error;
 573
 574         /* All the non-tip ones are ancestors of what we advertised */
 575         return 0;
 576
 577 error:
 578         sigchain_pop(SIGPIPE);
 579         if (cmd.out >= 0)
 580                 close(cmd.out);
 581         return 1;
 582 }
 583
 584 static void check_non_tip(void)
 585 {
 586         int i;
 587
 588         /*
 589          * In the normal in-process case without
 590          * uploadpack.allowReachableSHA1InWant,
 591          * non-tip requests can never happen.
 592          */
 593         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 594                 goto error;
 595         if (!has_unreachable(&want_obj))
 596                 /* All the non-tip ones are ancestors of what we advertised */
 597                 return;
 598
 599 error:
 600         /* Pick one of them (we know there at least is one) */
 601         for (i = 0; i < want_obj.nr; i++) {
 602                 struct object *o = want_obj.objects[i].item;
 603                 if (!is_our_ref(o))
 604                         die("git upload-pack: not our ref %s",
 605                             oid_to_hex(&o->oid));
 606         }
 607 }
 608
 609 static void send_shallow(struct commit_list *result)
 610 {
 611         while (result) {
 612                 struct object *object = &result->item->object;
 613                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 614                         packet_write_fmt(1, "shallow %s",
 615                                          oid_to_hex(&object->oid));
 616                         register_shallow(the_repository, &object->oid);
 617                         shallow_nr++;
 618                 }
 619                 result = result->next;
 620         }
 621 }
 622
 623 static void send_unshallow(const struct object_array *shallows)
 624 {
 625         int i;
 626
 627         for (i = 0; i < shallows->nr; i++) {
 628                 struct object *object = shallows->objects[i].item;
 629                 if (object->flags & NOT_SHALLOW) {
 630                         struct commit_list *parents;
 631                         packet_write_fmt(1, "unshallow %s",
 632                                          oid_to_hex(&object->oid));
 633                         object->flags &= ~CLIENT_SHALLOW;
 634                         /*
 635                          * We want to _register_ "object" as shallow, but we
 636                          * also need to traverse object's parents to deepen a
 637                          * shallow clone. Unregister it for now so we can
 638                          * parse and add the parents to the want list, then
 639                          * re-register it.
 640                          */
 641                         unregister_shallow(&object->oid);
 642                         object->parsed = 0;
 643                         parse_commit_or_die((struct commit *)object);
 644                         parents = ((struct commit *)object)->parents;
 645                         while (parents) {
 646                                 add_object_array(&parents->item->object,
 647                                                  NULL, &want_obj);
 648                                 parents = parents->next;
 649                         }
 650                         add_object_array(object, NULL, &extra_edge_obj);
 651                 }
 652                 /* make sure commit traversal conforms to client */
 653                 register_shallow(the_repository, &object->oid);
 654         }
 655 }
 656
 657 static void deepen(int depth, int deepen_relative,
 658                    struct object_array *shallows)
 659 {
 660         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 661                 int i;
 662
 663                 for (i = 0; i < shallows->nr; i++) {
 664                         struct object *object = shallows->objects[i].item;
 665                         object->flags |= NOT_SHALLOW;
 666                 }
 667         } else if (deepen_relative) {
 668                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 669                 struct commit_list *result;
 670
 671                 get_reachable_list(shallows, &reachable_shallows);
 672                 result = get_shallow_commits(&reachable_shallows,
 673                                              depth + 1,
 674                                              SHALLOW, NOT_SHALLOW);
 675                 send_shallow(result);
 676                 free_commit_list(result);
 677                 object_array_clear(&reachable_shallows);
 678         } else {
 679                 struct commit_list *result;
 680
 681                 result = get_shallow_commits(&want_obj, depth,
 682                                              SHALLOW, NOT_SHALLOW);
 683                 send_shallow(result);
 684                 free_commit_list(result);
 685         }
 686
 687         send_unshallow(shallows);
 688 }
 689
 690 static void deepen_by_rev_list(int ac, const char **av,
 691                                struct object_array *shallows)
 692 {
 693         struct commit_list *result;
 694
 695         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 696         send_shallow(result);
 697         free_commit_list(result);
 698         send_unshallow(shallows);
 699 }
 700
 701 /* Returns 1 if a shallow list is sent or 0 otherwise */
 702 static int send_shallow_list(int depth, int deepen_rev_list,
 703                              timestamp_t deepen_since,
 704                              struct string_list *deepen_not,
 705                              struct object_array *shallows)
 706 {
 707         int ret = 0;
 708
 709         if (depth > 0 && deepen_rev_list)
 710                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 711         if (depth > 0) {
 712                 deepen(depth, deepen_relative, shallows);
 713                 ret = 1;
 714         } else if (deepen_rev_list) {
 715                 struct argv_array av = ARGV_ARRAY_INIT;
 716                 int i;
 717
 718                 argv_array_push(&av, "rev-list");
 719                 if (deepen_since)
 720                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 721                 if (deepen_not->nr) {
 722                         argv_array_push(&av, "--not");
 723                         for (i = 0; i < deepen_not->nr; i++) {
 724                                 struct string_list_item *s = deepen_not->items + i;
 725                                 argv_array_push(&av, s->string);
 726                         }
 727                         argv_array_push(&av, "--not");
 728                 }
 729                 for (i = 0; i < want_obj.nr; i++) {
 730                         struct object *o = want_obj.objects[i].item;
 731                         argv_array_push(&av, oid_to_hex(&o->oid));
 732                 }
 733                 deepen_by_rev_list(av.argc, av.argv, shallows);
 734                 argv_array_clear(&av);
 735                 ret = 1;
 736         } else {
 737                 if (shallows->nr > 0) {
 738                         int i;
 739                         for (i = 0; i < shallows->nr; i++)
 740                                 register_shallow(the_repository,
 741                                                  &shallows->objects[i].item->oid);
 742                 }
 743         }
 744
 745         shallow_nr += shallows->nr;
 746         return ret;
 747 }
 748
 749 static int process_shallow(const char *line, struct object_array *shallows)
 750 {
 751         const char *arg;
 752         if (skip_prefix(line, "shallow ", &arg)) {
 753                 struct object_id oid;
 754                 struct object *object;
 755                 if (get_oid_hex(arg, &oid))
 756                         die("invalid shallow line: %s", line);
 757                 object = parse_object(the_repository, &oid);
 758                 if (!object)
 759                         return 1;
 760                 if (object->type != OBJ_COMMIT)
 761                         die("invalid shallow object %s", oid_to_hex(&oid));
 762                 if (!(object->flags & CLIENT_SHALLOW)) {
 763                         object->flags |= CLIENT_SHALLOW;
 764                         add_object_array(object, NULL, shallows);
 765                 }
 766                 return 1;
 767         }
 768
 769         return 0;
 770 }
 771
 772 static int process_deepen(const char *line, int *depth)
 773 {
 774         const char *arg;
 775         if (skip_prefix(line, "deepen ", &arg)) {
 776                 char *end = NULL;
 777                 *depth = (int)strtol(arg, &end, 0);
 778                 if (!end || *end || *depth <= 0)
 779                         die("Invalid deepen: %s", line);
 780                 return 1;
 781         }
 782
 783         return 0;
 784 }
 785
 786 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 787 {
 788         const char *arg;
 789         if (skip_prefix(line, "deepen-since ", &arg)) {
 790                 char *end = NULL;
 791                 *deepen_since = parse_timestamp(arg, &end, 0);
 792                 if (!end || *end || !deepen_since ||
 793                     /* revisions.c's max_age -1 is special */
 794                     *deepen_since == -1)
 795                         die("Invalid deepen-since: %s", line);
 796                 *deepen_rev_list = 1;
 797                 return 1;
 798         }
 799         return 0;
 800 }
 801
 802 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 803 {
 804         const char *arg;
 805         if (skip_prefix(line, "deepen-not ", &arg)) {
 806                 char *ref = NULL;
 807                 struct object_id oid;
 808                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 809                         die("git upload-pack: ambiguous deepen-not: %s", line);
 810                 string_list_append(deepen_not, ref);
 811                 free(ref);
 812                 *deepen_rev_list = 1;
 813                 return 1;
 814         }
 815         return 0;
 816 }
 817
 818 static void receive_needs(void)
 819 {
 820         struct object_array shallows = OBJECT_ARRAY_INIT;
 821         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 822         int depth = 0;
 823         int has_non_tip = 0;
 824         timestamp_t deepen_since = 0;
 825         int deepen_rev_list = 0;
 826
 827         shallow_nr = 0;
 828         for (;;) {
 829                 struct object *o;
 830                 const char *features;
 831                 struct object_id oid_buf;
 832                 char *line = packet_read_line(0, NULL);
 833                 const char *arg;
 834
 835                 reset_timeout();
 836                 if (!line)
 837                         break;
 838
 839                 if (process_shallow(line, &shallows))
 840                         continue;
 841                 if (process_deepen(line, &depth))
 842                         continue;
 843                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 844                         continue;
 845                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 846                         continue;
 847
 848                 if (skip_prefix(line, "filter ", &arg)) {
 849                         if (!filter_capability_requested)
 850                                 die("git upload-pack: filtering capability not negotiated");
 851                         parse_list_objects_filter(&filter_options, arg);
 852                         continue;
 853                 }
 854
 855                 if (!skip_prefix(line, "want ", &arg) ||
 856                     parse_oid_hex(arg, &oid_buf, &features))
 857                         die("git upload-pack: protocol error, "
 858                             "expected to get object ID, not '%s'", line);
 859
 860                 if (parse_feature_request(features, "deepen-relative"))
 861                         deepen_relative = 1;
 862                 if (parse_feature_request(features, "multi_ack_detailed"))
 863                         multi_ack = 2;
 864                 else if (parse_feature_request(features, "multi_ack"))
 865                         multi_ack = 1;
 866                 if (parse_feature_request(features, "no-done"))
 867                         no_done = 1;
 868                 if (parse_feature_request(features, "thin-pack"))
 869                         use_thin_pack = 1;
 870                 if (parse_feature_request(features, "ofs-delta"))
 871                         use_ofs_delta = 1;
 872                 if (parse_feature_request(features, "side-band-64k"))
 873                         use_sideband = LARGE_PACKET_MAX;
 874                 else if (parse_feature_request(features, "side-band"))
 875                         use_sideband = DEFAULT_PACKET_MAX;
 876                 if (parse_feature_request(features, "no-progress"))
 877                         no_progress = 1;
 878                 if (parse_feature_request(features, "include-tag"))
 879                         use_include_tag = 1;
 880                 if (allow_filter && parse_feature_request(features, "filter"))
 881                         filter_capability_requested = 1;
 882
 883                 o = parse_object(the_repository, &oid_buf);
 884                 if (!o) {
 885                         packet_write_fmt(1,
 886                                          "ERR upload-pack: not our ref %s",
 887                                          oid_to_hex(&oid_buf));
 888                         die("git upload-pack: not our ref %s",
 889                             oid_to_hex(&oid_buf));
 890                 }
 891                 if (!(o->flags & WANTED)) {
 892                         o->flags |= WANTED;
 893                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 894                               || is_our_ref(o)))
 895                                 has_non_tip = 1;
 896                         add_object_array(o, NULL, &want_obj);
 897                 }
 898         }
 899
 900         /*
 901          * We have sent all our refs already, and the other end
 902          * should have chosen out of them. When we are operating
 903          * in the stateless RPC mode, however, their choice may
 904          * have been based on the set of older refs advertised
 905          * by another process that handled the initial request.
 906          */
 907         if (has_non_tip)
 908                 check_non_tip();
 909
 910         if (!use_sideband && daemon_mode)
 911                 no_progress = 1;
 912
 913         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 914                 return;
 915
 916         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 917                               &deepen_not, &shallows))
 918                 packet_flush(1);
 919         object_array_clear(&shallows);
 920 }
 921
 922 /* return non-zero if the ref is hidden, otherwise 0 */
 923 static int mark_our_ref(const char *refname, const char *refname_full,
 924                         const struct object_id *oid)
 925 {
 926         struct object *o = lookup_unknown_object(oid->hash);
 927
 928         if (ref_is_hidden(refname, refname_full)) {
 929                 o->flags |= HIDDEN_REF;
 930                 return 1;
 931         }
 932         o->flags |= OUR_REF;
 933         return 0;
 934 }
 935
 936 static int check_ref(const char *refname_full, const struct object_id *oid,
 937                      int flag, void *cb_data)
 938 {
 939         const char *refname = strip_namespace(refname_full);
 940
 941         mark_our_ref(refname, refname_full, oid);
 942         return 0;
 943 }
 944
 945 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 946 {
 947         struct string_list_item *item;
 948
 949         if (!symref->nr)
 950                 return;
 951         for_each_string_list_item(item, symref)
 952                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 953 }
 954
 955 static int send_ref(const char *refname, const struct object_id *oid,
 956                     int flag, void *cb_data)
 957 {
 958         static const char *capabilities = "multi_ack thin-pack side-band"
 959                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 960                 " deepen-relative no-progress include-tag multi_ack_detailed";
 961         const char *refname_nons = strip_namespace(refname);
 962         struct object_id peeled;
 963
 964         if (mark_our_ref(refname_nons, refname, oid))
 965                 return 0;
 966
 967         if (capabilities) {
 968                 struct strbuf symref_info = STRBUF_INIT;
 969
 970                 format_symref_info(&symref_info, cb_data);
 971                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
 972                              oid_to_hex(oid), refname_nons,
 973                              0, capabilities,
 974                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 975                                      " allow-tip-sha1-in-want" : "",
 976                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 977                                      " allow-reachable-sha1-in-want" : "",
 978                              stateless_rpc ? " no-done" : "",
 979                              symref_info.buf,
 980                              allow_filter ? " filter" : "",
 981                              git_user_agent_sanitized());
 982                 strbuf_release(&symref_info);
 983         } else {
 984                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 985         }
 986         capabilities = NULL;
 987         if (!peel_ref(refname, &peeled))
 988                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 989         return 0;
 990 }
 991
 992 static int find_symref(const char *refname, const struct object_id *oid,
 993                        int flag, void *cb_data)
 994 {
 995         const char *symref_target;
 996         struct string_list_item *item;
 997
 998         if ((flag & REF_ISSYMREF) == 0)
 999                 return 0;
1000         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1001         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1002                 die("'%s' is a symref but it is not?", refname);
1003         item = string_list_append(cb_data, refname);
1004         item->util = xstrdup(symref_target);
1005         return 0;
1006 }
1007
1008 static int upload_pack_config(const char *var, const char *value, void *unused)
1009 {
1010         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1011                 if (git_config_bool(var, value))
1012                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1013                 else
1014                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1015         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1016                 if (git_config_bool(var, value))
1017                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1018                 else
1019                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1020         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1021                 if (git_config_bool(var, value))
1022                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1023                 else
1024                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1025         } else if (!strcmp("uploadpack.keepalive", var)) {
1026                 keepalive = git_config_int(var, value);
1027                 if (!keepalive)
1028                         keepalive = -1;
1029         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1030                 if (!strcmp("uploadpack.packobjectshook", var))
1031                         return git_config_string(&pack_objects_hook, var, value);
1032         } else if (!strcmp("uploadpack.allowfilter", var)) {
1033                 allow_filter = git_config_bool(var, value);
1034         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1035                 allow_ref_in_want = git_config_bool(var, value);
1036         }
1037         return parse_hide_refs_config(var, value, "uploadpack");
1038 }
1039
1040 void upload_pack(struct upload_pack_options *options)
1041 {
1042         struct string_list symref = STRING_LIST_INIT_DUP;
1043
1044         stateless_rpc = options->stateless_rpc;
1045         timeout = options->timeout;
1046         daemon_mode = options->daemon_mode;
1047
1048         git_config(upload_pack_config, NULL);
1049
1050         head_ref_namespaced(find_symref, &symref);
1051
1052         if (options->advertise_refs || !stateless_rpc) {
1053                 reset_timeout();
1054                 head_ref_namespaced(send_ref, &symref);
1055                 for_each_namespaced_ref(send_ref, &symref);
1056                 advertise_shallow_grafts(1);
1057                 packet_flush(1);
1058         } else {
1059                 head_ref_namespaced(check_ref, NULL);
1060                 for_each_namespaced_ref(check_ref, NULL);
1061         }
1062         string_list_clear(&symref, 1);
1063         if (options->advertise_refs)
1064                 return;
1065
1066         receive_needs();
1067         if (want_obj.nr) {
1068                 get_common_commits();
1069                 create_pack_file();
1070         }
1071 }
1072
1073 struct upload_pack_data {
1074         struct object_array wants;
1075         struct string_list wanted_refs;
1076         struct oid_array haves;
1077
1078         struct object_array shallows;
1079         struct string_list deepen_not;
1080         int depth;
1081         timestamp_t deepen_since;
1082         int deepen_rev_list;
1083         int deepen_relative;
1084
1085         unsigned stateless_rpc : 1;
1086
1087         unsigned use_thin_pack : 1;
1088         unsigned use_ofs_delta : 1;
1089         unsigned no_progress : 1;
1090         unsigned use_include_tag : 1;
1091         unsigned done : 1;
1092 };
1093
1094 static void upload_pack_data_init(struct upload_pack_data *data)
1095 {
1096         struct object_array wants = OBJECT_ARRAY_INIT;
1097         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1098         struct oid_array haves = OID_ARRAY_INIT;
1099         struct object_array shallows = OBJECT_ARRAY_INIT;
1100         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1101
1102         memset(data, 0, sizeof(*data));
1103         data->wants = wants;
1104         data->wanted_refs = wanted_refs;
1105         data->haves = haves;
1106         data->shallows = shallows;
1107         data->deepen_not = deepen_not;
1108 }
1109
1110 static void upload_pack_data_clear(struct upload_pack_data *data)
1111 {
1112         object_array_clear(&data->wants);
1113         string_list_clear(&data->wanted_refs, 1);
1114         oid_array_clear(&data->haves);
1115         object_array_clear(&data->shallows);
1116         string_list_clear(&data->deepen_not, 0);
1117 }
1118
1119 static int parse_want(const char *line)
1120 {
1121         const char *arg;
1122         if (skip_prefix(line, "want ", &arg)) {
1123                 struct object_id oid;
1124                 struct object *o;
1125
1126                 if (get_oid_hex(arg, &oid))
1127                         die("git upload-pack: protocol error, "
1128                             "expected to get oid, not '%s'", line);
1129
1130                 o = parse_object(the_repository, &oid);
1131                 if (!o) {
1132                         packet_write_fmt(1,
1133                                          "ERR upload-pack: not our ref %s",
1134                                          oid_to_hex(&oid));
1135                         die("git upload-pack: not our ref %s",
1136                             oid_to_hex(&oid));
1137                 }
1138
1139                 if (!(o->flags & WANTED)) {
1140                         o->flags |= WANTED;
1141                         add_object_array(o, NULL, &want_obj);
1142                 }
1143
1144                 return 1;
1145         }
1146
1147         return 0;
1148 }
1149
1150 static int parse_want_ref(const char *line, struct string_list *wanted_refs)
1151 {
1152         const char *arg;
1153         if (skip_prefix(line, "want-ref ", &arg)) {
1154                 struct object_id oid;
1155                 struct string_list_item *item;
1156                 struct object *o;
1157
1158                 if (read_ref(arg, &oid)) {
1159                         packet_write_fmt(1, "ERR unknown ref %s", arg);
1160                         die("unknown ref %s", arg);
1161                 }
1162
1163                 item = string_list_append(wanted_refs, arg);
1164                 item->util = oiddup(&oid);
1165
1166                 o = parse_object_or_die(&oid, arg);
1167                 if (!(o->flags & WANTED)) {
1168                         o->flags |= WANTED;
1169                         add_object_array(o, NULL, &want_obj);
1170                 }
1171
1172                 return 1;
1173         }
1174
1175         return 0;
1176 }
1177
1178 static int parse_have(const char *line, struct oid_array *haves)
1179 {
1180         const char *arg;
1181         if (skip_prefix(line, "have ", &arg)) {
1182                 struct object_id oid;
1183
1184                 if (get_oid_hex(arg, &oid))
1185                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1186                 oid_array_append(haves, &oid);
1187                 return 1;
1188         }
1189
1190         return 0;
1191 }
1192
1193 static void process_args(struct packet_reader *request,
1194                          struct upload_pack_data *data)
1195 {
1196         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1197                 const char *arg = request->line;
1198                 const char *p;
1199
1200                 /* process want */
1201                 if (parse_want(arg))
1202                         continue;
1203                 if (allow_ref_in_want && parse_want_ref(arg, &data->wanted_refs))
1204                         continue;
1205                 /* process have line */
1206                 if (parse_have(arg, &data->haves))
1207                         continue;
1208
1209                 /* process args like thin-pack */
1210                 if (!strcmp(arg, "thin-pack")) {
1211                         use_thin_pack = 1;
1212                         continue;
1213                 }
1214                 if (!strcmp(arg, "ofs-delta")) {
1215                         use_ofs_delta = 1;
1216                         continue;
1217                 }
1218                 if (!strcmp(arg, "no-progress")) {
1219                         no_progress = 1;
1220                         continue;
1221                 }
1222                 if (!strcmp(arg, "include-tag")) {
1223                         use_include_tag = 1;
1224                         continue;
1225                 }
1226                 if (!strcmp(arg, "done")) {
1227                         data->done = 1;
1228                         continue;
1229                 }
1230
1231                 /* Shallow related arguments */
1232                 if (process_shallow(arg, &data->shallows))
1233                         continue;
1234                 if (process_deepen(arg, &data->depth))
1235                         continue;
1236                 if (process_deepen_since(arg, &data->deepen_since,
1237                                          &data->deepen_rev_list))
1238                         continue;
1239                 if (process_deepen_not(arg, &data->deepen_not,
1240                                        &data->deepen_rev_list))
1241                         continue;
1242                 if (!strcmp(arg, "deepen-relative")) {
1243                         data->deepen_relative = 1;
1244                         continue;
1245                 }
1246
1247                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1248                         parse_list_objects_filter(&filter_options, p);
1249                         continue;
1250                 }
1251
1252                 /* ignore unknown lines maybe? */
1253                 die("unexpected line: '%s'", arg);
1254         }
1255 }
1256
1257 static int process_haves(struct oid_array *haves, struct oid_array *common)
1258 {
1259         int i;
1260
1261         /* Process haves */
1262         for (i = 0; i < haves->nr; i++) {
1263                 const struct object_id *oid = &haves->oid[i];
1264                 struct object *o;
1265                 int we_knew_they_have = 0;
1266
1267                 if (!has_object_file(oid))
1268                         continue;
1269
1270                 oid_array_append(common, oid);
1271
1272                 o = parse_object(the_repository, oid);
1273                 if (!o)
1274                         die("oops (%s)", oid_to_hex(oid));
1275                 if (o->type == OBJ_COMMIT) {
1276                         struct commit_list *parents;
1277                         struct commit *commit = (struct commit *)o;
1278                         if (o->flags & THEY_HAVE)
1279                                 we_knew_they_have = 1;
1280                         else
1281                                 o->flags |= THEY_HAVE;
1282                         if (!oldest_have || (commit->date < oldest_have))
1283                                 oldest_have = commit->date;
1284                         for (parents = commit->parents;
1285                              parents;
1286                              parents = parents->next)
1287                                 parents->item->object.flags |= THEY_HAVE;
1288                 }
1289                 if (!we_knew_they_have)
1290                         add_object_array(o, NULL, &have_obj);
1291         }
1292
1293         return 0;
1294 }
1295
1296 static int send_acks(struct oid_array *acks, struct strbuf *response)
1297 {
1298         int i;
1299
1300         packet_buf_write(response, "acknowledgments\n");
1301
1302         /* Send Acks */
1303         if (!acks->nr)
1304                 packet_buf_write(response, "NAK\n");
1305
1306         for (i = 0; i < acks->nr; i++) {
1307                 packet_buf_write(response, "ACK %s\n",
1308                                  oid_to_hex(&acks->oid[i]));
1309         }
1310
1311         if (ok_to_give_up()) {
1312                 /* Send Ready */
1313                 packet_buf_write(response, "ready\n");
1314                 return 1;
1315         }
1316
1317         return 0;
1318 }
1319
1320 static int process_haves_and_send_acks(struct upload_pack_data *data)
1321 {
1322         struct oid_array common = OID_ARRAY_INIT;
1323         struct strbuf response = STRBUF_INIT;
1324         int ret = 0;
1325
1326         process_haves(&data->haves, &common);
1327         if (data->done) {
1328                 ret = 1;
1329         } else if (send_acks(&common, &response)) {
1330                 packet_buf_delim(&response);
1331                 ret = 1;
1332         } else {
1333                 /* Add Flush */
1334                 packet_buf_flush(&response);
1335                 ret = 0;
1336         }
1337
1338         /* Send response */
1339         write_or_die(1, response.buf, response.len);
1340         strbuf_release(&response);
1341
1342         oid_array_clear(&data->haves);
1343         oid_array_clear(&common);
1344         return ret;
1345 }
1346
1347 static void send_wanted_ref_info(struct upload_pack_data *data)
1348 {
1349         const struct string_list_item *item;
1350
1351         if (!data->wanted_refs.nr)
1352                 return;
1353
1354         packet_write_fmt(1, "wanted-refs\n");
1355
1356         for_each_string_list_item(item, &data->wanted_refs) {
1357                 packet_write_fmt(1, "%s %s\n",
1358                                  oid_to_hex(item->util),
1359                                  item->string);
1360         }
1361
1362         packet_delim(1);
1363 }
1364
1365 static void send_shallow_info(struct upload_pack_data *data)
1366 {
1367         /* No shallow info needs to be sent */
1368         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1369             !is_repository_shallow(the_repository))
1370                 return;
1371
1372         packet_write_fmt(1, "shallow-info\n");
1373
1374         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1375                                data->deepen_since, &data->deepen_not,
1376                                &data->shallows) &&
1377             is_repository_shallow(the_repository))
1378                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
1379
1380         packet_delim(1);
1381 }
1382
1383 enum fetch_state {
1384         FETCH_PROCESS_ARGS = 0,
1385         FETCH_SEND_ACKS,
1386         FETCH_SEND_PACK,
1387         FETCH_DONE,
1388 };
1389
1390 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1391                    struct packet_reader *request)
1392 {
1393         enum fetch_state state = FETCH_PROCESS_ARGS;
1394         struct upload_pack_data data;
1395
1396         git_config(upload_pack_config, NULL);
1397
1398         upload_pack_data_init(&data);
1399         use_sideband = LARGE_PACKET_MAX;
1400
1401         while (state != FETCH_DONE) {
1402                 switch (state) {
1403                 case FETCH_PROCESS_ARGS:
1404                         process_args(request, &data);
1405
1406                         if (!want_obj.nr) {
1407                                 /*
1408                                  * Request didn't contain any 'want' lines,
1409                                  * guess they didn't want anything.
1410                                  */
1411                                 state = FETCH_DONE;
1412                         } else if (data.haves.nr) {
1413                                 /*
1414                                  * Request had 'have' lines, so lets ACK them.
1415                                  */
1416                                 state = FETCH_SEND_ACKS;
1417                         } else {
1418                                 /*
1419                                  * Request had 'want's but no 'have's so we can
1420                                  * immedietly go to construct and send a pack.
1421                                  */
1422                                 state = FETCH_SEND_PACK;
1423                         }
1424                         break;
1425                 case FETCH_SEND_ACKS:
1426                         if (process_haves_and_send_acks(&data))
1427                                 state = FETCH_SEND_PACK;
1428                         else
1429                                 state = FETCH_DONE;
1430                         break;
1431                 case FETCH_SEND_PACK:
1432                         send_wanted_ref_info(&data);
1433                         send_shallow_info(&data);
1434
1435                         packet_write_fmt(1, "packfile\n");
1436                         create_pack_file();
1437                         state = FETCH_DONE;
1438                         break;
1439                 case FETCH_DONE:
1440                         continue;
1441                 }
1442         }
1443
1444         upload_pack_data_clear(&data);
1445         return 0;
1446 }
1447
1448 int upload_pack_advertise(struct repository *r,
1449                           struct strbuf *value)
1450 {
1451         if (value) {
1452                 int allow_filter_value;
1453                 int allow_ref_in_want;
1454
1455                 strbuf_addstr(value, "shallow");
1456
1457                 if (!repo_config_get_bool(the_repository,
1458                                          "uploadpack.allowfilter",
1459                                          &allow_filter_value) &&
1460                     allow_filter_value)
1461                         strbuf_addstr(value, " filter");
1462
1463                 if (!repo_config_get_bool(the_repository,
1464                                          "uploadpack.allowrefinwant",
1465                                          &allow_ref_in_want) &&
1466                     allow_ref_in_want)
1467                         strbuf_addstr(value, " ref-in-want");
1468         }
1469
1470         return 1;
1471 }