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         const unsigned hexsz = the_hash_algo->hexsz;
 447
 448         cmd->argv = argv;
 449         cmd->git_cmd = 1;
 450         cmd->no_stderr = 1;
 451         cmd->in = -1;
 452         cmd->out = -1;
 453
 454         /*
 455          * If the next rev-list --stdin encounters an unknown commit,
 456          * it terminates, which will cause SIGPIPE in the write loop
 457          * below.
 458          */
 459         sigchain_push(SIGPIPE, SIG_IGN);
 460
 461         if (start_command(cmd))
 462                 goto error;
 463
 464         namebuf[0] = '^';
 465         namebuf[hexsz + 1] = '\n';
 466         for (i = get_max_object_index(); 0 < i; ) {
 467                 o = get_indexed_object(--i);
 468                 if (!o)
 469                         continue;
 470                 if (reachable && o->type == OBJ_COMMIT)
 471                         o->flags &= ~TMP_MARK;
 472                 if (!is_our_ref(o))
 473                         continue;
 474                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 475                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 476                         goto error;
 477         }
 478         namebuf[hexsz] = '\n';
 479         for (i = 0; i < src->nr; i++) {
 480                 o = src->objects[i].item;
 481                 if (is_our_ref(o)) {
 482                         if (reachable)
 483                                 add_object_array(o, NULL, reachable);
 484                         continue;
 485                 }
 486                 if (reachable && o->type == OBJ_COMMIT)
 487                         o->flags |= TMP_MARK;
 488                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 489                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 490                         goto error;
 491         }
 492         close(cmd->in);
 493         cmd->in = -1;
 494         sigchain_pop(SIGPIPE);
 495
 496         return 0;
 497
 498 error:
 499         sigchain_pop(SIGPIPE);
 500
 501         if (cmd->in >= 0)
 502                 close(cmd->in);
 503         if (cmd->out >= 0)
 504                 close(cmd->out);
 505         return -1;
 506 }
 507
 508 static int get_reachable_list(struct object_array *src,
 509                               struct object_array *reachable)
 510 {
 511         struct child_process cmd = CHILD_PROCESS_INIT;
 512         int i;
 513         struct object *o;
 514         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 515         const unsigned hexsz = the_hash_algo->hexsz;
 516
 517         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 518                 return -1;
 519
 520         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 521                 struct object_id sha1;
 522                 const char *p;
 523
 524                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 525                         break;
 526
 527                 o = lookup_object(the_repository, sha1.hash);
 528                 if (o && o->type == OBJ_COMMIT) {
 529                         o->flags &= ~TMP_MARK;
 530                 }
 531         }
 532         for (i = get_max_object_index(); 0 < i; i--) {
 533                 o = get_indexed_object(i - 1);
 534                 if (o && o->type == OBJ_COMMIT &&
 535                     (o->flags & TMP_MARK)) {
 536                         add_object_array(o, NULL, reachable);
 537                                 o->flags &= ~TMP_MARK;
 538                 }
 539         }
 540         close(cmd.out);
 541
 542         if (finish_command(&cmd))
 543                 return -1;
 544
 545         return 0;
 546 }
 547
 548 static int has_unreachable(struct object_array *src)
 549 {
 550         struct child_process cmd = CHILD_PROCESS_INIT;
 551         char buf[1];
 552         int i;
 553
 554         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 555                 return 1;
 556
 557         /*
 558          * The commits out of the rev-list are not ancestors of
 559          * our ref.
 560          */
 561         i = read_in_full(cmd.out, buf, 1);
 562         if (i)
 563                 goto error;
 564         close(cmd.out);
 565         cmd.out = -1;
 566
 567         /*
 568          * rev-list may have died by encountering a bad commit
 569          * in the history, in which case we do want to bail out
 570          * even when it showed no commit.
 571          */
 572         if (finish_command(&cmd))
 573                 goto error;
 574
 575         /* All the non-tip ones are ancestors of what we advertised */
 576         return 0;
 577
 578 error:
 579         sigchain_pop(SIGPIPE);
 580         if (cmd.out >= 0)
 581                 close(cmd.out);
 582         return 1;
 583 }
 584
 585 static void check_non_tip(void)
 586 {
 587         int i;
 588
 589         /*
 590          * In the normal in-process case without
 591          * uploadpack.allowReachableSHA1InWant,
 592          * non-tip requests can never happen.
 593          */
 594         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 595                 goto error;
 596         if (!has_unreachable(&want_obj))
 597                 /* All the non-tip ones are ancestors of what we advertised */
 598                 return;
 599
 600 error:
 601         /* Pick one of them (we know there at least is one) */
 602         for (i = 0; i < want_obj.nr; i++) {
 603                 struct object *o = want_obj.objects[i].item;
 604                 if (!is_our_ref(o))
 605                         die("git upload-pack: not our ref %s",
 606                             oid_to_hex(&o->oid));
 607         }
 608 }
 609
 610 static void send_shallow(struct commit_list *result)
 611 {
 612         while (result) {
 613                 struct object *object = &result->item->object;
 614                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 615                         packet_write_fmt(1, "shallow %s",
 616                                          oid_to_hex(&object->oid));
 617                         register_shallow(the_repository, &object->oid);
 618                         shallow_nr++;
 619                 }
 620                 result = result->next;
 621         }
 622 }
 623
 624 static void send_unshallow(const struct object_array *shallows)
 625 {
 626         int i;
 627
 628         for (i = 0; i < shallows->nr; i++) {
 629                 struct object *object = shallows->objects[i].item;
 630                 if (object->flags & NOT_SHALLOW) {
 631                         struct commit_list *parents;
 632                         packet_write_fmt(1, "unshallow %s",
 633                                          oid_to_hex(&object->oid));
 634                         object->flags &= ~CLIENT_SHALLOW;
 635                         /*
 636                          * We want to _register_ "object" as shallow, but we
 637                          * also need to traverse object's parents to deepen a
 638                          * shallow clone. Unregister it for now so we can
 639                          * parse and add the parents to the want list, then
 640                          * re-register it.
 641                          */
 642                         unregister_shallow(&object->oid);
 643                         object->parsed = 0;
 644                         parse_commit_or_die((struct commit *)object);
 645                         parents = ((struct commit *)object)->parents;
 646                         while (parents) {
 647                                 add_object_array(&parents->item->object,
 648                                                  NULL, &want_obj);
 649                                 parents = parents->next;
 650                         }
 651                         add_object_array(object, NULL, &extra_edge_obj);
 652                 }
 653                 /* make sure commit traversal conforms to client */
 654                 register_shallow(the_repository, &object->oid);
 655         }
 656 }
 657
 658 static void deepen(int depth, int deepen_relative,
 659                    struct object_array *shallows)
 660 {
 661         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 662                 int i;
 663
 664                 for (i = 0; i < shallows->nr; i++) {
 665                         struct object *object = shallows->objects[i].item;
 666                         object->flags |= NOT_SHALLOW;
 667                 }
 668         } else if (deepen_relative) {
 669                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 670                 struct commit_list *result;
 671
 672                 get_reachable_list(shallows, &reachable_shallows);
 673                 result = get_shallow_commits(&reachable_shallows,
 674                                              depth + 1,
 675                                              SHALLOW, NOT_SHALLOW);
 676                 send_shallow(result);
 677                 free_commit_list(result);
 678                 object_array_clear(&reachable_shallows);
 679         } else {
 680                 struct commit_list *result;
 681
 682                 result = get_shallow_commits(&want_obj, depth,
 683                                              SHALLOW, NOT_SHALLOW);
 684                 send_shallow(result);
 685                 free_commit_list(result);
 686         }
 687
 688         send_unshallow(shallows);
 689 }
 690
 691 static void deepen_by_rev_list(int ac, const char **av,
 692                                struct object_array *shallows)
 693 {
 694         struct commit_list *result;
 695
 696         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 697         send_shallow(result);
 698         free_commit_list(result);
 699         send_unshallow(shallows);
 700 }
 701
 702 /* Returns 1 if a shallow list is sent or 0 otherwise */
 703 static int send_shallow_list(int depth, int deepen_rev_list,
 704                              timestamp_t deepen_since,
 705                              struct string_list *deepen_not,
 706                              struct object_array *shallows)
 707 {
 708         int ret = 0;
 709
 710         if (depth > 0 && deepen_rev_list)
 711                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 712         if (depth > 0) {
 713                 deepen(depth, deepen_relative, shallows);
 714                 ret = 1;
 715         } else if (deepen_rev_list) {
 716                 struct argv_array av = ARGV_ARRAY_INIT;
 717                 int i;
 718
 719                 argv_array_push(&av, "rev-list");
 720                 if (deepen_since)
 721                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 722                 if (deepen_not->nr) {
 723                         argv_array_push(&av, "--not");
 724                         for (i = 0; i < deepen_not->nr; i++) {
 725                                 struct string_list_item *s = deepen_not->items + i;
 726                                 argv_array_push(&av, s->string);
 727                         }
 728                         argv_array_push(&av, "--not");
 729                 }
 730                 for (i = 0; i < want_obj.nr; i++) {
 731                         struct object *o = want_obj.objects[i].item;
 732                         argv_array_push(&av, oid_to_hex(&o->oid));
 733                 }
 734                 deepen_by_rev_list(av.argc, av.argv, shallows);
 735                 argv_array_clear(&av);
 736                 ret = 1;
 737         } else {
 738                 if (shallows->nr > 0) {
 739                         int i;
 740                         for (i = 0; i < shallows->nr; i++)
 741                                 register_shallow(the_repository,
 742                                                  &shallows->objects[i].item->oid);
 743                 }
 744         }
 745
 746         shallow_nr += shallows->nr;
 747         return ret;
 748 }
 749
 750 static int process_shallow(const char *line, struct object_array *shallows)
 751 {
 752         const char *arg;
 753         if (skip_prefix(line, "shallow ", &arg)) {
 754                 struct object_id oid;
 755                 struct object *object;
 756                 if (get_oid_hex(arg, &oid))
 757                         die("invalid shallow line: %s", line);
 758                 object = parse_object(the_repository, &oid);
 759                 if (!object)
 760                         return 1;
 761                 if (object->type != OBJ_COMMIT)
 762                         die("invalid shallow object %s", oid_to_hex(&oid));
 763                 if (!(object->flags & CLIENT_SHALLOW)) {
 764                         object->flags |= CLIENT_SHALLOW;
 765                         add_object_array(object, NULL, shallows);
 766                 }
 767                 return 1;
 768         }
 769
 770         return 0;
 771 }
 772
 773 static int process_deepen(const char *line, int *depth)
 774 {
 775         const char *arg;
 776         if (skip_prefix(line, "deepen ", &arg)) {
 777                 char *end = NULL;
 778                 *depth = (int)strtol(arg, &end, 0);
 779                 if (!end || *end || *depth <= 0)
 780                         die("Invalid deepen: %s", line);
 781                 return 1;
 782         }
 783
 784         return 0;
 785 }
 786
 787 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 788 {
 789         const char *arg;
 790         if (skip_prefix(line, "deepen-since ", &arg)) {
 791                 char *end = NULL;
 792                 *deepen_since = parse_timestamp(arg, &end, 0);
 793                 if (!end || *end || !deepen_since ||
 794                     /* revisions.c's max_age -1 is special */
 795                     *deepen_since == -1)
 796                         die("Invalid deepen-since: %s", line);
 797                 *deepen_rev_list = 1;
 798                 return 1;
 799         }
 800         return 0;
 801 }
 802
 803 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 804 {
 805         const char *arg;
 806         if (skip_prefix(line, "deepen-not ", &arg)) {
 807                 char *ref = NULL;
 808                 struct object_id oid;
 809                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 810                         die("git upload-pack: ambiguous deepen-not: %s", line);
 811                 string_list_append(deepen_not, ref);
 812                 free(ref);
 813                 *deepen_rev_list = 1;
 814                 return 1;
 815         }
 816         return 0;
 817 }
 818
 819 static void receive_needs(void)
 820 {
 821         struct object_array shallows = OBJECT_ARRAY_INIT;
 822         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 823         int depth = 0;
 824         int has_non_tip = 0;
 825         timestamp_t deepen_since = 0;
 826         int deepen_rev_list = 0;
 827
 828         shallow_nr = 0;
 829         for (;;) {
 830                 struct object *o;
 831                 const char *features;
 832                 struct object_id oid_buf;
 833                 char *line = packet_read_line(0, NULL);
 834                 const char *arg;
 835
 836                 reset_timeout();
 837                 if (!line)
 838                         break;
 839
 840                 if (process_shallow(line, &shallows))
 841                         continue;
 842                 if (process_deepen(line, &depth))
 843                         continue;
 844                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 845                         continue;
 846                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 847                         continue;
 848
 849                 if (skip_prefix(line, "filter ", &arg)) {
 850                         if (!filter_capability_requested)
 851                                 die("git upload-pack: filtering capability not negotiated");
 852                         parse_list_objects_filter(&filter_options, arg);
 853                         continue;
 854                 }
 855
 856                 if (!skip_prefix(line, "want ", &arg) ||
 857                     parse_oid_hex(arg, &oid_buf, &features))
 858                         die("git upload-pack: protocol error, "
 859                             "expected to get object ID, not '%s'", line);
 860
 861                 if (parse_feature_request(features, "deepen-relative"))
 862                         deepen_relative = 1;
 863                 if (parse_feature_request(features, "multi_ack_detailed"))
 864                         multi_ack = 2;
 865                 else if (parse_feature_request(features, "multi_ack"))
 866                         multi_ack = 1;
 867                 if (parse_feature_request(features, "no-done"))
 868                         no_done = 1;
 869                 if (parse_feature_request(features, "thin-pack"))
 870                         use_thin_pack = 1;
 871                 if (parse_feature_request(features, "ofs-delta"))
 872                         use_ofs_delta = 1;
 873                 if (parse_feature_request(features, "side-band-64k"))
 874                         use_sideband = LARGE_PACKET_MAX;
 875                 else if (parse_feature_request(features, "side-band"))
 876                         use_sideband = DEFAULT_PACKET_MAX;
 877                 if (parse_feature_request(features, "no-progress"))
 878                         no_progress = 1;
 879                 if (parse_feature_request(features, "include-tag"))
 880                         use_include_tag = 1;
 881                 if (allow_filter && parse_feature_request(features, "filter"))
 882                         filter_capability_requested = 1;
 883
 884                 o = parse_object(the_repository, &oid_buf);
 885                 if (!o) {
 886                         packet_write_fmt(1,
 887                                          "ERR upload-pack: not our ref %s",
 888                                          oid_to_hex(&oid_buf));
 889                         die("git upload-pack: not our ref %s",
 890                             oid_to_hex(&oid_buf));
 891                 }
 892                 if (!(o->flags & WANTED)) {
 893                         o->flags |= WANTED;
 894                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 895                               || is_our_ref(o)))
 896                                 has_non_tip = 1;
 897                         add_object_array(o, NULL, &want_obj);
 898                 }
 899         }
 900
 901         /*
 902          * We have sent all our refs already, and the other end
 903          * should have chosen out of them. When we are operating
 904          * in the stateless RPC mode, however, their choice may
 905          * have been based on the set of older refs advertised
 906          * by another process that handled the initial request.
 907          */
 908         if (has_non_tip)
 909                 check_non_tip();
 910
 911         if (!use_sideband && daemon_mode)
 912                 no_progress = 1;
 913
 914         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 915                 return;
 916
 917         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 918                               &deepen_not, &shallows))
 919                 packet_flush(1);
 920         object_array_clear(&shallows);
 921 }
 922
 923 /* return non-zero if the ref is hidden, otherwise 0 */
 924 static int mark_our_ref(const char *refname, const char *refname_full,
 925                         const struct object_id *oid)
 926 {
 927         struct object *o = lookup_unknown_object(oid->hash);
 928
 929         if (ref_is_hidden(refname, refname_full)) {
 930                 o->flags |= HIDDEN_REF;
 931                 return 1;
 932         }
 933         o->flags |= OUR_REF;
 934         return 0;
 935 }
 936
 937 static int check_ref(const char *refname_full, const struct object_id *oid,
 938                      int flag, void *cb_data)
 939 {
 940         const char *refname = strip_namespace(refname_full);
 941
 942         mark_our_ref(refname, refname_full, oid);
 943         return 0;
 944 }
 945
 946 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 947 {
 948         struct string_list_item *item;
 949
 950         if (!symref->nr)
 951                 return;
 952         for_each_string_list_item(item, symref)
 953                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 954 }
 955
 956 static int send_ref(const char *refname, const struct object_id *oid,
 957                     int flag, void *cb_data)
 958 {
 959         static const char *capabilities = "multi_ack thin-pack side-band"
 960                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 961                 " deepen-relative no-progress include-tag multi_ack_detailed";
 962         const char *refname_nons = strip_namespace(refname);
 963         struct object_id peeled;
 964
 965         if (mark_our_ref(refname_nons, refname, oid))
 966                 return 0;
 967
 968         if (capabilities) {
 969                 struct strbuf symref_info = STRBUF_INIT;
 970
 971                 format_symref_info(&symref_info, cb_data);
 972                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
 973                              oid_to_hex(oid), refname_nons,
 974                              0, capabilities,
 975                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 976                                      " allow-tip-sha1-in-want" : "",
 977                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 978                                      " allow-reachable-sha1-in-want" : "",
 979                              stateless_rpc ? " no-done" : "",
 980                              symref_info.buf,
 981                              allow_filter ? " filter" : "",
 982                              git_user_agent_sanitized());
 983                 strbuf_release(&symref_info);
 984         } else {
 985                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 986         }
 987         capabilities = NULL;
 988         if (!peel_ref(refname, &peeled))
 989                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 990         return 0;
 991 }
 992
 993 static int find_symref(const char *refname, const struct object_id *oid,
 994                        int flag, void *cb_data)
 995 {
 996         const char *symref_target;
 997         struct string_list_item *item;
 998
 999         if ((flag & REF_ISSYMREF) == 0)
1000                 return 0;
1001         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1002         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1003                 die("'%s' is a symref but it is not?", refname);
1004         item = string_list_append(cb_data, refname);
1005         item->util = xstrdup(symref_target);
1006         return 0;
1007 }
1008
1009 static int upload_pack_config(const char *var, const char *value, void *unused)
1010 {
1011         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1012                 if (git_config_bool(var, value))
1013                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1014                 else
1015                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1016         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1017                 if (git_config_bool(var, value))
1018                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1019                 else
1020                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1021         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1022                 if (git_config_bool(var, value))
1023                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1024                 else
1025                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1026         } else if (!strcmp("uploadpack.keepalive", var)) {
1027                 keepalive = git_config_int(var, value);
1028                 if (!keepalive)
1029                         keepalive = -1;
1030         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1031                 if (!strcmp("uploadpack.packobjectshook", var))
1032                         return git_config_string(&pack_objects_hook, var, value);
1033         } else if (!strcmp("uploadpack.allowfilter", var)) {
1034                 allow_filter = git_config_bool(var, value);
1035         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1036                 allow_ref_in_want = git_config_bool(var, value);
1037         }
1038         return parse_hide_refs_config(var, value, "uploadpack");
1039 }
1040
1041 void upload_pack(struct upload_pack_options *options)
1042 {
1043         struct string_list symref = STRING_LIST_INIT_DUP;
1044
1045         stateless_rpc = options->stateless_rpc;
1046         timeout = options->timeout;
1047         daemon_mode = options->daemon_mode;
1048
1049         git_config(upload_pack_config, NULL);
1050
1051         head_ref_namespaced(find_symref, &symref);
1052
1053         if (options->advertise_refs || !stateless_rpc) {
1054                 reset_timeout();
1055                 head_ref_namespaced(send_ref, &symref);
1056                 for_each_namespaced_ref(send_ref, &symref);
1057                 advertise_shallow_grafts(1);
1058                 packet_flush(1);
1059         } else {
1060                 head_ref_namespaced(check_ref, NULL);
1061                 for_each_namespaced_ref(check_ref, NULL);
1062         }
1063         string_list_clear(&symref, 1);
1064         if (options->advertise_refs)
1065                 return;
1066
1067         receive_needs();
1068         if (want_obj.nr) {
1069                 get_common_commits();
1070                 create_pack_file();
1071         }
1072 }
1073
1074 struct upload_pack_data {
1075         struct object_array wants;
1076         struct string_list wanted_refs;
1077         struct oid_array haves;
1078
1079         struct object_array shallows;
1080         struct string_list deepen_not;
1081         int depth;
1082         timestamp_t deepen_since;
1083         int deepen_rev_list;
1084         int deepen_relative;
1085
1086         unsigned stateless_rpc : 1;
1087
1088         unsigned use_thin_pack : 1;
1089         unsigned use_ofs_delta : 1;
1090         unsigned no_progress : 1;
1091         unsigned use_include_tag : 1;
1092         unsigned done : 1;
1093 };
1094
1095 static void upload_pack_data_init(struct upload_pack_data *data)
1096 {
1097         struct object_array wants = OBJECT_ARRAY_INIT;
1098         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1099         struct oid_array haves = OID_ARRAY_INIT;
1100         struct object_array shallows = OBJECT_ARRAY_INIT;
1101         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1102
1103         memset(data, 0, sizeof(*data));
1104         data->wants = wants;
1105         data->wanted_refs = wanted_refs;
1106         data->haves = haves;
1107         data->shallows = shallows;
1108         data->deepen_not = deepen_not;
1109 }
1110
1111 static void upload_pack_data_clear(struct upload_pack_data *data)
1112 {
1113         object_array_clear(&data->wants);
1114         string_list_clear(&data->wanted_refs, 1);
1115         oid_array_clear(&data->haves);
1116         object_array_clear(&data->shallows);
1117         string_list_clear(&data->deepen_not, 0);
1118 }
1119
1120 static int parse_want(const char *line)
1121 {
1122         const char *arg;
1123         if (skip_prefix(line, "want ", &arg)) {
1124                 struct object_id oid;
1125                 struct object *o;
1126
1127                 if (get_oid_hex(arg, &oid))
1128                         die("git upload-pack: protocol error, "
1129                             "expected to get oid, not '%s'", line);
1130
1131                 o = parse_object(the_repository, &oid);
1132                 if (!o) {
1133                         packet_write_fmt(1,
1134                                          "ERR upload-pack: not our ref %s",
1135                                          oid_to_hex(&oid));
1136                         die("git upload-pack: not our ref %s",
1137                             oid_to_hex(&oid));
1138                 }
1139
1140                 if (!(o->flags & WANTED)) {
1141                         o->flags |= WANTED;
1142                         add_object_array(o, NULL, &want_obj);
1143                 }
1144
1145                 return 1;
1146         }
1147
1148         return 0;
1149 }
1150
1151 static int parse_want_ref(const char *line, struct string_list *wanted_refs)
1152 {
1153         const char *arg;
1154         if (skip_prefix(line, "want-ref ", &arg)) {
1155                 struct object_id oid;
1156                 struct string_list_item *item;
1157                 struct object *o;
1158
1159                 if (read_ref(arg, &oid)) {
1160                         packet_write_fmt(1, "ERR unknown ref %s", arg);
1161                         die("unknown ref %s", arg);
1162                 }
1163
1164                 item = string_list_append(wanted_refs, arg);
1165                 item->util = oiddup(&oid);
1166
1167                 o = parse_object_or_die(&oid, arg);
1168                 if (!(o->flags & WANTED)) {
1169                         o->flags |= WANTED;
1170                         add_object_array(o, NULL, &want_obj);
1171                 }
1172
1173                 return 1;
1174         }
1175
1176         return 0;
1177 }
1178
1179 static int parse_have(const char *line, struct oid_array *haves)
1180 {
1181         const char *arg;
1182         if (skip_prefix(line, "have ", &arg)) {
1183                 struct object_id oid;
1184
1185                 if (get_oid_hex(arg, &oid))
1186                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1187                 oid_array_append(haves, &oid);
1188                 return 1;
1189         }
1190
1191         return 0;
1192 }
1193
1194 static void process_args(struct packet_reader *request,
1195                          struct upload_pack_data *data)
1196 {
1197         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1198                 const char *arg = request->line;
1199                 const char *p;
1200
1201                 /* process want */
1202                 if (parse_want(arg))
1203                         continue;
1204                 if (allow_ref_in_want && parse_want_ref(arg, &data->wanted_refs))
1205                         continue;
1206                 /* process have line */
1207                 if (parse_have(arg, &data->haves))
1208                         continue;
1209
1210                 /* process args like thin-pack */
1211                 if (!strcmp(arg, "thin-pack")) {
1212                         use_thin_pack = 1;
1213                         continue;
1214                 }
1215                 if (!strcmp(arg, "ofs-delta")) {
1216                         use_ofs_delta = 1;
1217                         continue;
1218                 }
1219                 if (!strcmp(arg, "no-progress")) {
1220                         no_progress = 1;
1221                         continue;
1222                 }
1223                 if (!strcmp(arg, "include-tag")) {
1224                         use_include_tag = 1;
1225                         continue;
1226                 }
1227                 if (!strcmp(arg, "done")) {
1228                         data->done = 1;
1229                         continue;
1230                 }
1231
1232                 /* Shallow related arguments */
1233                 if (process_shallow(arg, &data->shallows))
1234                         continue;
1235                 if (process_deepen(arg, &data->depth))
1236                         continue;
1237                 if (process_deepen_since(arg, &data->deepen_since,
1238                                          &data->deepen_rev_list))
1239                         continue;
1240                 if (process_deepen_not(arg, &data->deepen_not,
1241                                        &data->deepen_rev_list))
1242                         continue;
1243                 if (!strcmp(arg, "deepen-relative")) {
1244                         data->deepen_relative = 1;
1245                         continue;
1246                 }
1247
1248                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1249                         parse_list_objects_filter(&filter_options, p);
1250                         continue;
1251                 }
1252
1253                 /* ignore unknown lines maybe? */
1254                 die("unexpected line: '%s'", arg);
1255         }
1256 }
1257
1258 static int process_haves(struct oid_array *haves, struct oid_array *common)
1259 {
1260         int i;
1261
1262         /* Process haves */
1263         for (i = 0; i < haves->nr; i++) {
1264                 const struct object_id *oid = &haves->oid[i];
1265                 struct object *o;
1266                 int we_knew_they_have = 0;
1267
1268                 if (!has_object_file(oid))
1269                         continue;
1270
1271                 oid_array_append(common, oid);
1272
1273                 o = parse_object(the_repository, oid);
1274                 if (!o)
1275                         die("oops (%s)", oid_to_hex(oid));
1276                 if (o->type == OBJ_COMMIT) {
1277                         struct commit_list *parents;
1278                         struct commit *commit = (struct commit *)o;
1279                         if (o->flags & THEY_HAVE)
1280                                 we_knew_they_have = 1;
1281                         else
1282                                 o->flags |= THEY_HAVE;
1283                         if (!oldest_have || (commit->date < oldest_have))
1284                                 oldest_have = commit->date;
1285                         for (parents = commit->parents;
1286                              parents;
1287                              parents = parents->next)
1288                                 parents->item->object.flags |= THEY_HAVE;
1289                 }
1290                 if (!we_knew_they_have)
1291                         add_object_array(o, NULL, &have_obj);
1292         }
1293
1294         return 0;
1295 }
1296
1297 static int send_acks(struct oid_array *acks, struct strbuf *response)
1298 {
1299         int i;
1300
1301         packet_buf_write(response, "acknowledgments\n");
1302
1303         /* Send Acks */
1304         if (!acks->nr)
1305                 packet_buf_write(response, "NAK\n");
1306
1307         for (i = 0; i < acks->nr; i++) {
1308                 packet_buf_write(response, "ACK %s\n",
1309                                  oid_to_hex(&acks->oid[i]));
1310         }
1311
1312         if (ok_to_give_up()) {
1313                 /* Send Ready */
1314                 packet_buf_write(response, "ready\n");
1315                 return 1;
1316         }
1317
1318         return 0;
1319 }
1320
1321 static int process_haves_and_send_acks(struct upload_pack_data *data)
1322 {
1323         struct oid_array common = OID_ARRAY_INIT;
1324         struct strbuf response = STRBUF_INIT;
1325         int ret = 0;
1326
1327         process_haves(&data->haves, &common);
1328         if (data->done) {
1329                 ret = 1;
1330         } else if (send_acks(&common, &response)) {
1331                 packet_buf_delim(&response);
1332                 ret = 1;
1333         } else {
1334                 /* Add Flush */
1335                 packet_buf_flush(&response);
1336                 ret = 0;
1337         }
1338
1339         /* Send response */
1340         write_or_die(1, response.buf, response.len);
1341         strbuf_release(&response);
1342
1343         oid_array_clear(&data->haves);
1344         oid_array_clear(&common);
1345         return ret;
1346 }
1347
1348 static void send_wanted_ref_info(struct upload_pack_data *data)
1349 {
1350         const struct string_list_item *item;
1351
1352         if (!data->wanted_refs.nr)
1353                 return;
1354
1355         packet_write_fmt(1, "wanted-refs\n");
1356
1357         for_each_string_list_item(item, &data->wanted_refs) {
1358                 packet_write_fmt(1, "%s %s\n",
1359                                  oid_to_hex(item->util),
1360                                  item->string);
1361         }
1362
1363         packet_delim(1);
1364 }
1365
1366 static void send_shallow_info(struct upload_pack_data *data)
1367 {
1368         /* No shallow info needs to be sent */
1369         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1370             !is_repository_shallow(the_repository))
1371                 return;
1372
1373         packet_write_fmt(1, "shallow-info\n");
1374
1375         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1376                                data->deepen_since, &data->deepen_not,
1377                                &data->shallows) &&
1378             is_repository_shallow(the_repository))
1379                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
1380
1381         packet_delim(1);
1382 }
1383
1384 enum fetch_state {
1385         FETCH_PROCESS_ARGS = 0,
1386         FETCH_SEND_ACKS,
1387         FETCH_SEND_PACK,
1388         FETCH_DONE,
1389 };
1390
1391 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1392                    struct packet_reader *request)
1393 {
1394         enum fetch_state state = FETCH_PROCESS_ARGS;
1395         struct upload_pack_data data;
1396
1397         git_config(upload_pack_config, NULL);
1398
1399         upload_pack_data_init(&data);
1400         use_sideband = LARGE_PACKET_MAX;
1401
1402         while (state != FETCH_DONE) {
1403                 switch (state) {
1404                 case FETCH_PROCESS_ARGS:
1405                         process_args(request, &data);
1406
1407                         if (!want_obj.nr) {
1408                                 /*
1409                                  * Request didn't contain any 'want' lines,
1410                                  * guess they didn't want anything.
1411                                  */
1412                                 state = FETCH_DONE;
1413                         } else if (data.haves.nr) {
1414                                 /*
1415                                  * Request had 'have' lines, so lets ACK them.
1416                                  */
1417                                 state = FETCH_SEND_ACKS;
1418                         } else {
1419                                 /*
1420                                  * Request had 'want's but no 'have's so we can
1421                                  * immedietly go to construct and send a pack.
1422                                  */
1423                                 state = FETCH_SEND_PACK;
1424                         }
1425                         break;
1426                 case FETCH_SEND_ACKS:
1427                         if (process_haves_and_send_acks(&data))
1428                                 state = FETCH_SEND_PACK;
1429                         else
1430                                 state = FETCH_DONE;
1431                         break;
1432                 case FETCH_SEND_PACK:
1433                         send_wanted_ref_info(&data);
1434                         send_shallow_info(&data);
1435
1436                         packet_write_fmt(1, "packfile\n");
1437                         create_pack_file();
1438                         state = FETCH_DONE;
1439                         break;
1440                 case FETCH_DONE:
1441                         continue;
1442                 }
1443         }
1444
1445         upload_pack_data_clear(&data);
1446         return 0;
1447 }
1448
1449 int upload_pack_advertise(struct repository *r,
1450                           struct strbuf *value)
1451 {
1452         if (value) {
1453                 int allow_filter_value;
1454                 int allow_ref_in_want;
1455
1456                 strbuf_addstr(value, "shallow");
1457
1458                 if (!repo_config_get_bool(the_repository,
1459                                          "uploadpack.allowfilter",
1460                                          &allow_filter_value) &&
1461                     allow_filter_value)
1462                         strbuf_addstr(value, " filter");
1463
1464                 if (!repo_config_get_bool(the_repository,
1465                                          "uploadpack.allowrefinwant",
1466                                          &allow_ref_in_want) &&
1467                     allow_ref_in_want)
1468                         strbuf_addstr(value, " ref-in-want");
1469         }
1470
1471         return 1;
1472 }