upload-pack.c

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