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

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