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 "object-store.h"
   7 #include "tag.h"
   8 #include "object.h"
   9 #include "commit.h"
  10 #include "diff.h"
  11 #include "revision.h"
  12 #include "list-objects.h"
  13 #include "list-objects-filter.h"
  14 #include "list-objects-filter-options.h"
  15 #include "run-command.h"
  16 #include "connect.h"
  17 #include "sigchain.h"
  18 #include "version.h"
  19 #include "string-list.h"
  20 #include "argv-array.h"
  21 #include "prio-queue.h"
  22 #include "protocol.h"
  23 #include "quote.h"
  24 #include "upload-pack.h"
  25 #include "serve.h"
  26
  27 /* Remember to update object flag allocation in object.h */
  28 #define THEY_HAVE       (1u << 11)
  29 #define OUR_REF         (1u << 12)
  30 #define WANTED          (1u << 13)
  31 #define COMMON_KNOWN    (1u << 14)
  32 #define REACHABLE       (1u << 15)
  33
  34 #define SHALLOW         (1u << 16)
  35 #define NOT_SHALLOW     (1u << 17)
  36 #define CLIENT_SHALLOW  (1u << 18)
  37 #define HIDDEN_REF      (1u << 19)
  38
  39 static timestamp_t oldest_have;
  40
  41 static int deepen_relative;
  42 static int multi_ack;
  43 static int no_done;
  44 static int use_thin_pack, use_ofs_delta, use_include_tag;
  45 static int no_progress, daemon_mode;
  46 /* Allow specifying sha1 if it is a ref tip. */
  47 #define ALLOW_TIP_SHA1  01
  48 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  49 #define ALLOW_REACHABLE_SHA1    02
  50 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  51 #define ALLOW_ANY_SHA1  07
  52 static unsigned int allow_unadvertised_object_request;
  53 static int shallow_nr;
  54 static struct object_array have_obj;
  55 static struct object_array want_obj;
  56 static struct object_array extra_edge_obj;
  57 static unsigned int timeout;
  58 static int keepalive = 5;
  59 /* 0 for no sideband,
  60  * otherwise maximum packet size (up to 65520 bytes).
  61  */
  62 static int use_sideband;
  63 static int stateless_rpc;
  64 static const char *pack_objects_hook;
  65
  66 static int filter_capability_requested;
  67 static int allow_filter;
  68 static int allow_ref_in_want;
  69 static struct list_objects_filter_options filter_options;
  70
  71 static void reset_timeout(void)
  72 {
  73         alarm(timeout);
  74 }
  75
  76 static void send_client_data(int fd, const char *data, ssize_t sz)
  77 {
  78         if (use_sideband) {
  79                 send_sideband(1, fd, data, sz, use_sideband);
  80                 return;
  81         }
  82         if (fd == 3)
  83                 /* emergency quit */
  84                 fd = 2;
  85         if (fd == 2) {
  86                 /* XXX: are we happy to lose stuff here? */
  87                 xwrite(fd, data, sz);
  88                 return;
  89         }
  90         write_or_die(fd, data, sz);
  91 }
  92
  93 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  94 {
  95         FILE *fp = cb_data;
  96         if (graft->nr_parent == -1)
  97                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  98         return 0;
  99 }
 100
 101 static void create_pack_file(void)
 102 {
 103         struct child_process pack_objects = CHILD_PROCESS_INIT;
 104         char data[8193], progress[128];
 105         char abort_msg[] = "aborting due to possible repository "
 106                 "corruption on the remote side.";
 107         int buffered = -1;
 108         ssize_t sz;
 109         int i;
 110         FILE *pipe_fd;
 111
 112         if (!pack_objects_hook)
 113                 pack_objects.git_cmd = 1;
 114         else {
 115                 argv_array_push(&pack_objects.args, pack_objects_hook);
 116                 argv_array_push(&pack_objects.args, "git");
 117                 pack_objects.use_shell = 1;
 118         }
 119
 120         if (shallow_nr) {
 121                 argv_array_push(&pack_objects.args, "--shallow-file");
 122                 argv_array_push(&pack_objects.args, "");
 123         }
 124         argv_array_push(&pack_objects.args, "pack-objects");
 125         argv_array_push(&pack_objects.args, "--revs");
 126         if (use_thin_pack)
 127                 argv_array_push(&pack_objects.args, "--thin");
 128
 129         argv_array_push(&pack_objects.args, "--stdout");
 130         if (shallow_nr)
 131                 argv_array_push(&pack_objects.args, "--shallow");
 132         if (!no_progress)
 133                 argv_array_push(&pack_objects.args, "--progress");
 134         if (use_ofs_delta)
 135                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 136         if (use_include_tag)
 137                 argv_array_push(&pack_objects.args, "--include-tag");
 138         if (filter_options.filter_spec) {
 139                 if (pack_objects.use_shell) {
 140                         struct strbuf buf = STRBUF_INIT;
 141                         sq_quote_buf(&buf, filter_options.filter_spec);
 142                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 143                         strbuf_release(&buf);
 144                 } else {
 145                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 146                                          filter_options.filter_spec);
 147                 }
 148         }
 149
 150         pack_objects.in = -1;
 151         pack_objects.out = -1;
 152         pack_objects.err = -1;
 153
 154         if (start_command(&pack_objects))
 155                 die("git upload-pack: unable to fork git-pack-objects");
 156
 157         pipe_fd = xfdopen(pack_objects.in, "w");
 158
 159         if (shallow_nr)
 160                 for_each_commit_graft(write_one_shallow, pipe_fd);
 161
 162         for (i = 0; i < want_obj.nr; i++)
 163                 fprintf(pipe_fd, "%s\n",
 164                         oid_to_hex(&want_obj.objects[i].item->oid));
 165         fprintf(pipe_fd, "--not\n");
 166         for (i = 0; i < have_obj.nr; i++)
 167                 fprintf(pipe_fd, "%s\n",
 168                         oid_to_hex(&have_obj.objects[i].item->oid));
 169         for (i = 0; i < extra_edge_obj.nr; i++)
 170                 fprintf(pipe_fd, "%s\n",
 171                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 172         fprintf(pipe_fd, "\n");
 173         fflush(pipe_fd);
 174         fclose(pipe_fd);
 175
 176         /* We read from pack_objects.err to capture stderr output for
 177          * progress bar, and pack_objects.out to capture the pack data.
 178          */
 179
 180         while (1) {
 181                 struct pollfd pfd[2];
 182                 int pe, pu, pollsize;
 183                 int ret;
 184
 185                 reset_timeout();
 186
 187                 pollsize = 0;
 188                 pe = pu = -1;
 189
 190                 if (0 <= pack_objects.out) {
 191                         pfd[pollsize].fd = pack_objects.out;
 192                         pfd[pollsize].events = POLLIN;
 193                         pu = pollsize;
 194                         pollsize++;
 195                 }
 196                 if (0 <= pack_objects.err) {
 197                         pfd[pollsize].fd = pack_objects.err;
 198                         pfd[pollsize].events = POLLIN;
 199                         pe = pollsize;
 200                         pollsize++;
 201                 }
 202
 203                 if (!pollsize)
 204                         break;
 205
 206                 ret = poll(pfd, pollsize,
 207                         keepalive < 0 ? -1 : 1000 * keepalive);
 208
 209                 if (ret < 0) {
 210                         if (errno != EINTR) {
 211                                 error_errno("poll failed, resuming");
 212                                 sleep(1);
 213                         }
 214                         continue;
 215                 }
 216                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 217                         /* Status ready; we ship that in the side-band
 218                          * or dump to the standard error.
 219                          */
 220                         sz = xread(pack_objects.err, progress,
 221                                   sizeof(progress));
 222                         if (0 < sz)
 223                                 send_client_data(2, progress, sz);
 224                         else if (sz == 0) {
 225                                 close(pack_objects.err);
 226                                 pack_objects.err = -1;
 227                         }
 228                         else
 229                                 goto fail;
 230                         /* give priority to status messages */
 231                         continue;
 232                 }
 233                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 234                         /* Data ready; we keep the last byte to ourselves
 235                          * in case we detect broken rev-list, so that we
 236                          * can leave the stream corrupted.  This is
 237                          * unfortunate -- unpack-objects would happily
 238                          * accept a valid packdata with trailing garbage,
 239                          * so appending garbage after we pass all the
 240                          * pack data is not good enough to signal
 241                          * breakage to downstream.
 242                          */
 243                         char *cp = data;
 244                         ssize_t outsz = 0;
 245                         if (0 <= buffered) {
 246                                 *cp++ = buffered;
 247                                 outsz++;
 248                         }
 249                         sz = xread(pack_objects.out, cp,
 250                                   sizeof(data) - outsz);
 251                         if (0 < sz)
 252                                 ;
 253                         else if (sz == 0) {
 254                                 close(pack_objects.out);
 255                                 pack_objects.out = -1;
 256                         }
 257                         else
 258                                 goto fail;
 259                         sz += outsz;
 260                         if (1 < sz) {
 261                                 buffered = data[sz-1] & 0xFF;
 262                                 sz--;
 263                         }
 264                         else
 265                                 buffered = -1;
 266                         send_client_data(1, data, sz);
 267                 }
 268
 269                 /*
 270                  * We hit the keepalive timeout without saying anything; send
 271                  * an empty message on the data sideband just to let the other
 272                  * side know we're still working on it, but don't have any data
 273                  * yet.
 274                  *
 275                  * If we don't have a sideband channel, there's no room in the
 276                  * protocol to say anything, so those clients are just out of
 277                  * luck.
 278                  */
 279                 if (!ret && use_sideband) {
 280                         static const char buf[] = "0005\1";
 281                         write_or_die(1, buf, 5);
 282                 }
 283         }
 284
 285         if (finish_command(&pack_objects)) {
 286                 error("git upload-pack: git-pack-objects died with error.");
 287                 goto fail;
 288         }
 289
 290         /* flush the data */
 291         if (0 <= buffered) {
 292                 data[0] = buffered;
 293                 send_client_data(1, data, 1);
 294                 fprintf(stderr, "flushed.\n");
 295         }
 296         if (use_sideband)
 297                 packet_flush(1);
 298         return;
 299
 300  fail:
 301         send_client_data(3, abort_msg, sizeof(abort_msg));
 302         die("git upload-pack: %s", abort_msg);
 303 }
 304
 305 static int got_oid(const char *hex, struct object_id *oid)
 306 {
 307         struct object *o;
 308         int we_knew_they_have = 0;
 309
 310         if (get_oid_hex(hex, oid))
 311                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 312         if (!has_object_file(oid))
 313                 return -1;
 314
 315         o = parse_object(oid);
 316         if (!o)
 317                 die("oops (%s)", oid_to_hex(oid));
 318         if (o->type == OBJ_COMMIT) {
 319                 struct commit_list *parents;
 320                 struct commit *commit = (struct commit *)o;
 321                 if (o->flags & THEY_HAVE)
 322                         we_knew_they_have = 1;
 323                 else
 324                         o->flags |= THEY_HAVE;
 325                 if (!oldest_have || (commit->date < oldest_have))
 326                         oldest_have = commit->date;
 327                 for (parents = commit->parents;
 328                      parents;
 329                      parents = parents->next)
 330                         parents->item->object.flags |= THEY_HAVE;
 331         }
 332         if (!we_knew_they_have) {
 333                 add_object_array(o, NULL, &have_obj);
 334                 return 1;
 335         }
 336         return 0;
 337 }
 338
 339 static int reachable(struct commit *want)
 340 {
 341         struct prio_queue work = { compare_commits_by_commit_date };
 342
 343         prio_queue_put(&work, want);
 344         while (work.nr) {
 345                 struct commit_list *list;
 346                 struct commit *commit = prio_queue_get(&work);
 347
 348                 if (commit->object.flags & THEY_HAVE) {
 349                         want->object.flags |= COMMON_KNOWN;
 350                         break;
 351                 }
 352                 if (!commit->object.parsed)
 353                         parse_object(&commit->object.oid);
 354                 if (commit->object.flags & REACHABLE)
 355                         continue;
 356                 commit->object.flags |= REACHABLE;
 357                 if (commit->date < oldest_have)
 358                         continue;
 359                 for (list = commit->parents; list; list = list->next) {
 360                         struct commit *parent = list->item;
 361                         if (!(parent->object.flags & REACHABLE))
 362                                 prio_queue_put(&work, parent);
 363                 }
 364         }
 365         want->object.flags |= REACHABLE;
 366         clear_commit_marks(want, REACHABLE);
 367         clear_prio_queue(&work);
 368         return (want->object.flags & COMMON_KNOWN);
 369 }
 370
 371 static int ok_to_give_up(void)
 372 {
 373         int i;
 374
 375         if (!have_obj.nr)
 376                 return 0;
 377
 378         for (i = 0; i < want_obj.nr; i++) {
 379                 struct object *want = want_obj.objects[i].item;
 380
 381                 if (want->flags & COMMON_KNOWN)
 382                         continue;
 383                 want = deref_tag(want, "a want line", 0);
 384                 if (!want || want->type != OBJ_COMMIT) {
 385                         /* no way to tell if this is reachable by
 386                          * looking at the ancestry chain alone, so
 387                          * leave a note to ourselves not to worry about
 388                          * this object anymore.
 389                          */
 390                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 391                         continue;
 392                 }
 393                 if (!reachable((struct commit *)want))
 394                         return 0;
 395         }
 396         return 1;
 397 }
 398
 399 static int get_common_commits(void)
 400 {
 401         struct object_id oid;
 402         char last_hex[GIT_MAX_HEXSZ + 1];
 403         int got_common = 0;
 404         int got_other = 0;
 405         int sent_ready = 0;
 406
 407         save_commit_buffer = 0;
 408
 409         for (;;) {
 410                 char *line = packet_read_line(0, NULL);
 411                 const char *arg;
 412
 413                 reset_timeout();
 414
 415                 if (!line) {
 416                         if (multi_ack == 2 && got_common
 417                             && !got_other && ok_to_give_up()) {
 418                                 sent_ready = 1;
 419                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 420                         }
 421                         if (have_obj.nr == 0 || multi_ack)
 422                                 packet_write_fmt(1, "NAK\n");
 423
 424                         if (no_done && sent_ready) {
 425                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 426                                 return 0;
 427                         }
 428                         if (stateless_rpc)
 429                                 exit(0);
 430                         got_common = 0;
 431                         got_other = 0;
 432                         continue;
 433                 }
 434                 if (skip_prefix(line, "have ", &arg)) {
 435                         switch (got_oid(arg, &oid)) {
 436                         case -1: /* they have what we do not */
 437                                 got_other = 1;
 438                                 if (multi_ack && ok_to_give_up()) {
 439                                         const char *hex = oid_to_hex(&oid);
 440                                         if (multi_ack == 2) {
 441                                                 sent_ready = 1;
 442                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 443                                         } else
 444                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 445                                 }
 446                                 break;
 447                         default:
 448                                 got_common = 1;
 449                                 oid_to_hex_r(last_hex, &oid);
 450                                 if (multi_ack == 2)
 451                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 452                                 else if (multi_ack)
 453                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 454                                 else if (have_obj.nr == 1)
 455                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 456                                 break;
 457                         }
 458                         continue;
 459                 }
 460                 if (!strcmp(line, "done")) {
 461                         if (have_obj.nr > 0) {
 462                                 if (multi_ack)
 463                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 464                                 return 0;
 465                         }
 466                         packet_write_fmt(1, "NAK\n");
 467                         return -1;
 468                 }
 469                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 470         }
 471 }
 472
 473 static int is_our_ref(struct object *o)
 474 {
 475         int allow_hidden_ref = (allow_unadvertised_object_request &
 476                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 477         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 478 }
 479
 480 /*
 481  * on successful case, it's up to the caller to close cmd->out
 482  */
 483 static int do_reachable_revlist(struct child_process *cmd,
 484                                 struct object_array *src,
 485                                 struct object_array *reachable)
 486 {
 487         static const char *argv[] = {
 488                 "rev-list", "--stdin", NULL,
 489         };
 490         struct object *o;
 491         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 492         int i;
 493
 494         cmd->argv = argv;
 495         cmd->git_cmd = 1;
 496         cmd->no_stderr = 1;
 497         cmd->in = -1;
 498         cmd->out = -1;
 499
 500         /*
 501          * If the next rev-list --stdin encounters an unknown commit,
 502          * it terminates, which will cause SIGPIPE in the write loop
 503          * below.
 504          */
 505         sigchain_push(SIGPIPE, SIG_IGN);
 506
 507         if (start_command(cmd))
 508                 goto error;
 509
 510         namebuf[0] = '^';
 511         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 512         for (i = get_max_object_index(); 0 < i; ) {
 513                 o = get_indexed_object(--i);
 514                 if (!o)
 515                         continue;
 516                 if (reachable && o->type == OBJ_COMMIT)
 517                         o->flags &= ~TMP_MARK;
 518                 if (!is_our_ref(o))
 519                         continue;
 520                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 521                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 522                         goto error;
 523         }
 524         namebuf[GIT_SHA1_HEXSZ] = '\n';
 525         for (i = 0; i < src->nr; i++) {
 526                 o = src->objects[i].item;
 527                 if (is_our_ref(o)) {
 528                         if (reachable)
 529                                 add_object_array(o, NULL, reachable);
 530                         continue;
 531                 }
 532                 if (reachable && o->type == OBJ_COMMIT)
 533                         o->flags |= TMP_MARK;
 534                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 535                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 536                         goto error;
 537         }
 538         close(cmd->in);
 539         cmd->in = -1;
 540         sigchain_pop(SIGPIPE);
 541
 542         return 0;
 543
 544 error:
 545         sigchain_pop(SIGPIPE);
 546
 547         if (cmd->in >= 0)
 548                 close(cmd->in);
 549         if (cmd->out >= 0)
 550                 close(cmd->out);
 551         return -1;
 552 }
 553
 554 static int get_reachable_list(struct object_array *src,
 555                               struct object_array *reachable)
 556 {
 557         struct child_process cmd = CHILD_PROCESS_INIT;
 558         int i;
 559         struct object *o;
 560         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 561         const unsigned hexsz = the_hash_algo->hexsz;
 562
 563         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 564                 return -1;
 565
 566         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 567                 struct object_id sha1;
 568                 const char *p;
 569
 570                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 571                         break;
 572
 573                 o = lookup_object(sha1.hash);
 574                 if (o && o->type == OBJ_COMMIT) {
 575                         o->flags &= ~TMP_MARK;
 576                 }
 577         }
 578         for (i = get_max_object_index(); 0 < i; i--) {
 579                 o = get_indexed_object(i - 1);
 580                 if (o && o->type == OBJ_COMMIT &&
 581                     (o->flags & TMP_MARK)) {
 582                         add_object_array(o, NULL, reachable);
 583                                 o->flags &= ~TMP_MARK;
 584                 }
 585         }
 586         close(cmd.out);
 587
 588         if (finish_command(&cmd))
 589                 return -1;
 590
 591         return 0;
 592 }
 593
 594 static int has_unreachable(struct object_array *src)
 595 {
 596         struct child_process cmd = CHILD_PROCESS_INIT;
 597         char buf[1];
 598         int i;
 599
 600         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 601                 return 1;
 602
 603         /*
 604          * The commits out of the rev-list are not ancestors of
 605          * our ref.
 606          */
 607         i = read_in_full(cmd.out, buf, 1);
 608         if (i)
 609                 goto error;
 610         close(cmd.out);
 611         cmd.out = -1;
 612
 613         /*
 614          * rev-list may have died by encountering a bad commit
 615          * in the history, in which case we do want to bail out
 616          * even when it showed no commit.
 617          */
 618         if (finish_command(&cmd))
 619                 goto error;
 620
 621         /* All the non-tip ones are ancestors of what we advertised */
 622         return 0;
 623
 624 error:
 625         sigchain_pop(SIGPIPE);
 626         if (cmd.out >= 0)
 627                 close(cmd.out);
 628         return 1;
 629 }
 630
 631 static void check_non_tip(void)
 632 {
 633         int i;
 634
 635         /*
 636          * In the normal in-process case without
 637          * uploadpack.allowReachableSHA1InWant,
 638          * non-tip requests can never happen.
 639          */
 640         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 641                 goto error;
 642         if (!has_unreachable(&want_obj))
 643                 /* All the non-tip ones are ancestors of what we advertised */
 644                 return;
 645
 646 error:
 647         /* Pick one of them (we know there at least is one) */
 648         for (i = 0; i < want_obj.nr; i++) {
 649                 struct object *o = want_obj.objects[i].item;
 650                 if (!is_our_ref(o))
 651                         die("git upload-pack: not our ref %s",
 652                             oid_to_hex(&o->oid));
 653         }
 654 }
 655
 656 static void send_shallow(struct commit_list *result)
 657 {
 658         while (result) {
 659                 struct object *object = &result->item->object;
 660                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 661                         packet_write_fmt(1, "shallow %s",
 662                                          oid_to_hex(&object->oid));
 663                         register_shallow(the_repository, &object->oid);
 664                         shallow_nr++;
 665                 }
 666                 result = result->next;
 667         }
 668 }
 669
 670 static void send_unshallow(const struct object_array *shallows)
 671 {
 672         int i;
 673
 674         for (i = 0; i < shallows->nr; i++) {
 675                 struct object *object = shallows->objects[i].item;
 676                 if (object->flags & NOT_SHALLOW) {
 677                         struct commit_list *parents;
 678                         packet_write_fmt(1, "unshallow %s",
 679                                          oid_to_hex(&object->oid));
 680                         object->flags &= ~CLIENT_SHALLOW;
 681                         /*
 682                          * We want to _register_ "object" as shallow, but we
 683                          * also need to traverse object's parents to deepen a
 684                          * shallow clone. Unregister it for now so we can
 685                          * parse and add the parents to the want list, then
 686                          * re-register it.
 687                          */
 688                         unregister_shallow(&object->oid);
 689                         object->parsed = 0;
 690                         parse_commit_or_die((struct commit *)object);
 691                         parents = ((struct commit *)object)->parents;
 692                         while (parents) {
 693                                 add_object_array(&parents->item->object,
 694                                                  NULL, &want_obj);
 695                                 parents = parents->next;
 696                         }
 697                         add_object_array(object, NULL, &extra_edge_obj);
 698                 }
 699                 /* make sure commit traversal conforms to client */
 700                 register_shallow(the_repository, &object->oid);
 701         }
 702 }
 703
 704 static void deepen(int depth, int deepen_relative,
 705                    struct object_array *shallows)
 706 {
 707         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 708                 int i;
 709
 710                 for (i = 0; i < shallows->nr; i++) {
 711                         struct object *object = shallows->objects[i].item;
 712                         object->flags |= NOT_SHALLOW;
 713                 }
 714         } else if (deepen_relative) {
 715                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 716                 struct commit_list *result;
 717
 718                 get_reachable_list(shallows, &reachable_shallows);
 719                 result = get_shallow_commits(&reachable_shallows,
 720                                              depth + 1,
 721                                              SHALLOW, NOT_SHALLOW);
 722                 send_shallow(result);
 723                 free_commit_list(result);
 724                 object_array_clear(&reachable_shallows);
 725         } else {
 726                 struct commit_list *result;
 727
 728                 result = get_shallow_commits(&want_obj, depth,
 729                                              SHALLOW, NOT_SHALLOW);
 730                 send_shallow(result);
 731                 free_commit_list(result);
 732         }
 733
 734         send_unshallow(shallows);
 735 }
 736
 737 static void deepen_by_rev_list(int ac, const char **av,
 738                                struct object_array *shallows)
 739 {
 740         struct commit_list *result;
 741
 742         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 743         send_shallow(result);
 744         free_commit_list(result);
 745         send_unshallow(shallows);
 746 }
 747
 748 /* Returns 1 if a shallow list is sent or 0 otherwise */
 749 static int send_shallow_list(int depth, int deepen_rev_list,
 750                              timestamp_t deepen_since,
 751                              struct string_list *deepen_not,
 752                              struct object_array *shallows)
 753 {
 754         int ret = 0;
 755
 756         if (depth > 0 && deepen_rev_list)
 757                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 758         if (depth > 0) {
 759                 deepen(depth, deepen_relative, shallows);
 760                 ret = 1;
 761         } else if (deepen_rev_list) {
 762                 struct argv_array av = ARGV_ARRAY_INIT;
 763                 int i;
 764
 765                 argv_array_push(&av, "rev-list");
 766                 if (deepen_since)
 767                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 768                 if (deepen_not->nr) {
 769                         argv_array_push(&av, "--not");
 770                         for (i = 0; i < deepen_not->nr; i++) {
 771                                 struct string_list_item *s = deepen_not->items + i;
 772                                 argv_array_push(&av, s->string);
 773                         }
 774                         argv_array_push(&av, "--not");
 775                 }
 776                 for (i = 0; i < want_obj.nr; i++) {
 777                         struct object *o = want_obj.objects[i].item;
 778                         argv_array_push(&av, oid_to_hex(&o->oid));
 779                 }
 780                 deepen_by_rev_list(av.argc, av.argv, shallows);
 781                 argv_array_clear(&av);
 782                 ret = 1;
 783         } else {
 784                 if (shallows->nr > 0) {
 785                         int i;
 786                         for (i = 0; i < shallows->nr; i++)
 787                                 register_shallow(the_repository,
 788                                                  &shallows->objects[i].item->oid);
 789                 }
 790         }
 791
 792         shallow_nr += shallows->nr;
 793         return ret;
 794 }
 795
 796 static int process_shallow(const char *line, struct object_array *shallows)
 797 {
 798         const char *arg;
 799         if (skip_prefix(line, "shallow ", &arg)) {
 800                 struct object_id oid;
 801                 struct object *object;
 802                 if (get_oid_hex(arg, &oid))
 803                         die("invalid shallow line: %s", line);
 804                 object = parse_object(&oid);
 805                 if (!object)
 806                         return 1;
 807                 if (object->type != OBJ_COMMIT)
 808                         die("invalid shallow object %s", oid_to_hex(&oid));
 809                 if (!(object->flags & CLIENT_SHALLOW)) {
 810                         object->flags |= CLIENT_SHALLOW;
 811                         add_object_array(object, NULL, shallows);
 812                 }
 813                 return 1;
 814         }
 815
 816         return 0;
 817 }
 818
 819 static int process_deepen(const char *line, int *depth)
 820 {
 821         const char *arg;
 822         if (skip_prefix(line, "deepen ", &arg)) {
 823                 char *end = NULL;
 824                 *depth = (int)strtol(arg, &end, 0);
 825                 if (!end || *end || *depth <= 0)
 826                         die("Invalid deepen: %s", line);
 827                 return 1;
 828         }
 829
 830         return 0;
 831 }
 832
 833 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 834 {
 835         const char *arg;
 836         if (skip_prefix(line, "deepen-since ", &arg)) {
 837                 char *end = NULL;
 838                 *deepen_since = parse_timestamp(arg, &end, 0);
 839                 if (!end || *end || !deepen_since ||
 840                     /* revisions.c's max_age -1 is special */
 841                     *deepen_since == -1)
 842                         die("Invalid deepen-since: %s", line);
 843                 *deepen_rev_list = 1;
 844                 return 1;
 845         }
 846         return 0;
 847 }
 848
 849 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 850 {
 851         const char *arg;
 852         if (skip_prefix(line, "deepen-not ", &arg)) {
 853                 char *ref = NULL;
 854                 struct object_id oid;
 855                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 856                         die("git upload-pack: ambiguous deepen-not: %s", line);
 857                 string_list_append(deepen_not, ref);
 858                 free(ref);
 859                 *deepen_rev_list = 1;
 860                 return 1;
 861         }
 862         return 0;
 863 }
 864
 865 static void receive_needs(void)
 866 {
 867         struct object_array shallows = OBJECT_ARRAY_INIT;
 868         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 869         int depth = 0;
 870         int has_non_tip = 0;
 871         timestamp_t deepen_since = 0;
 872         int deepen_rev_list = 0;
 873
 874         shallow_nr = 0;
 875         for (;;) {
 876                 struct object *o;
 877                 const char *features;
 878                 struct object_id oid_buf;
 879                 char *line = packet_read_line(0, NULL);
 880                 const char *arg;
 881
 882                 reset_timeout();
 883                 if (!line)
 884                         break;
 885
 886                 if (process_shallow(line, &shallows))
 887                         continue;
 888                 if (process_deepen(line, &depth))
 889                         continue;
 890                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 891                         continue;
 892                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 893                         continue;
 894
 895                 if (skip_prefix(line, "filter ", &arg)) {
 896                         if (!filter_capability_requested)
 897                                 die("git upload-pack: filtering capability not negotiated");
 898                         parse_list_objects_filter(&filter_options, arg);
 899                         continue;
 900                 }
 901
 902                 if (!skip_prefix(line, "want ", &arg) ||
 903                     parse_oid_hex(arg, &oid_buf, &features))
 904                         die("git upload-pack: protocol error, "
 905                             "expected to get object ID, not '%s'", line);
 906
 907                 if (parse_feature_request(features, "deepen-relative"))
 908                         deepen_relative = 1;
 909                 if (parse_feature_request(features, "multi_ack_detailed"))
 910                         multi_ack = 2;
 911                 else if (parse_feature_request(features, "multi_ack"))
 912                         multi_ack = 1;
 913                 if (parse_feature_request(features, "no-done"))
 914                         no_done = 1;
 915                 if (parse_feature_request(features, "thin-pack"))
 916                         use_thin_pack = 1;
 917                 if (parse_feature_request(features, "ofs-delta"))
 918                         use_ofs_delta = 1;
 919                 if (parse_feature_request(features, "side-band-64k"))
 920                         use_sideband = LARGE_PACKET_MAX;
 921                 else if (parse_feature_request(features, "side-band"))
 922                         use_sideband = DEFAULT_PACKET_MAX;
 923                 if (parse_feature_request(features, "no-progress"))
 924                         no_progress = 1;
 925                 if (parse_feature_request(features, "include-tag"))
 926                         use_include_tag = 1;
 927                 if (allow_filter && parse_feature_request(features, "filter"))
 928                         filter_capability_requested = 1;
 929
 930                 o = parse_object(&oid_buf);
 931                 if (!o) {
 932                         packet_write_fmt(1,
 933                                          "ERR upload-pack: not our ref %s",
 934                                          oid_to_hex(&oid_buf));
 935                         die("git upload-pack: not our ref %s",
 936                             oid_to_hex(&oid_buf));
 937                 }
 938                 if (!(o->flags & WANTED)) {
 939                         o->flags |= WANTED;
 940                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 941                               || is_our_ref(o)))
 942                                 has_non_tip = 1;
 943                         add_object_array(o, NULL, &want_obj);
 944                 }
 945         }
 946
 947         /*
 948          * We have sent all our refs already, and the other end
 949          * should have chosen out of them. When we are operating
 950          * in the stateless RPC mode, however, their choice may
 951          * have been based on the set of older refs advertised
 952          * by another process that handled the initial request.
 953          */
 954         if (has_non_tip)
 955                 check_non_tip();
 956
 957         if (!use_sideband && daemon_mode)
 958                 no_progress = 1;
 959
 960         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 961                 return;
 962
 963         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 964                               &deepen_not, &shallows))
 965                 packet_flush(1);
 966         object_array_clear(&shallows);
 967 }
 968
 969 /* return non-zero if the ref is hidden, otherwise 0 */
 970 static int mark_our_ref(const char *refname, const char *refname_full,
 971                         const struct object_id *oid)
 972 {
 973         struct object *o = lookup_unknown_object(oid->hash);
 974
 975         if (ref_is_hidden(refname, refname_full)) {
 976                 o->flags |= HIDDEN_REF;
 977                 return 1;
 978         }
 979         o->flags |= OUR_REF;
 980         return 0;
 981 }
 982
 983 static int check_ref(const char *refname_full, const struct object_id *oid,
 984                      int flag, void *cb_data)
 985 {
 986         const char *refname = strip_namespace(refname_full);
 987
 988         mark_our_ref(refname, refname_full, oid);
 989         return 0;
 990 }
 991
 992 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 993 {
 994         struct string_list_item *item;
 995
 996         if (!symref->nr)
 997                 return;
 998         for_each_string_list_item(item, symref)
 999                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1000 }
1001
1002 static int send_ref(const char *refname, const struct object_id *oid,
1003                     int flag, void *cb_data)
1004 {
1005         static const char *capabilities = "multi_ack thin-pack side-band"
1006                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1007                 " deepen-relative no-progress include-tag multi_ack_detailed";
1008         const char *refname_nons = strip_namespace(refname);
1009         struct object_id peeled;
1010
1011         if (mark_our_ref(refname_nons, refname, oid))
1012                 return 0;
1013
1014         if (capabilities) {
1015                 struct strbuf symref_info = STRBUF_INIT;
1016
1017                 format_symref_info(&symref_info, cb_data);
1018                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1019                              oid_to_hex(oid), refname_nons,
1020                              0, capabilities,
1021                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1022                                      " allow-tip-sha1-in-want" : "",
1023                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1024                                      " allow-reachable-sha1-in-want" : "",
1025                              stateless_rpc ? " no-done" : "",
1026                              symref_info.buf,
1027                              allow_filter ? " filter" : "",
1028                              git_user_agent_sanitized());
1029                 strbuf_release(&symref_info);
1030         } else {
1031                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1032         }
1033         capabilities = NULL;
1034         if (!peel_ref(refname, &peeled))
1035                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1036         return 0;
1037 }
1038
1039 static int find_symref(const char *refname, const struct object_id *oid,
1040                        int flag, void *cb_data)
1041 {
1042         const char *symref_target;
1043         struct string_list_item *item;
1044
1045         if ((flag & REF_ISSYMREF) == 0)
1046                 return 0;
1047         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1048         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1049                 die("'%s' is a symref but it is not?", refname);
1050         item = string_list_append(cb_data, refname);
1051         item->util = xstrdup(symref_target);
1052         return 0;
1053 }
1054
1055 static int upload_pack_config(const char *var, const char *value, void *unused)
1056 {
1057         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1058                 if (git_config_bool(var, value))
1059                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1060                 else
1061                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1062         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1063                 if (git_config_bool(var, value))
1064                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1065                 else
1066                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1067         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1068                 if (git_config_bool(var, value))
1069                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1070                 else
1071                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1072         } else if (!strcmp("uploadpack.keepalive", var)) {
1073                 keepalive = git_config_int(var, value);
1074                 if (!keepalive)
1075                         keepalive = -1;
1076         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1077                 if (!strcmp("uploadpack.packobjectshook", var))
1078                         return git_config_string(&pack_objects_hook, var, value);
1079         } else if (!strcmp("uploadpack.allowfilter", var)) {
1080                 allow_filter = git_config_bool(var, value);
1081         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1082                 allow_ref_in_want = git_config_bool(var, value);
1083         }
1084         return parse_hide_refs_config(var, value, "uploadpack");
1085 }
1086
1087 void upload_pack(struct upload_pack_options *options)
1088 {
1089         struct string_list symref = STRING_LIST_INIT_DUP;
1090
1091         stateless_rpc = options->stateless_rpc;
1092         timeout = options->timeout;
1093         daemon_mode = options->daemon_mode;
1094
1095         git_config(upload_pack_config, NULL);
1096
1097         head_ref_namespaced(find_symref, &symref);
1098
1099         if (options->advertise_refs || !stateless_rpc) {
1100                 reset_timeout();
1101                 head_ref_namespaced(send_ref, &symref);
1102                 for_each_namespaced_ref(send_ref, &symref);
1103                 advertise_shallow_grafts(1);
1104                 packet_flush(1);
1105         } else {
1106                 head_ref_namespaced(check_ref, NULL);
1107                 for_each_namespaced_ref(check_ref, NULL);
1108         }
1109         string_list_clear(&symref, 1);
1110         if (options->advertise_refs)
1111                 return;
1112
1113         receive_needs();
1114         if (want_obj.nr) {
1115                 get_common_commits();
1116                 create_pack_file();
1117         }
1118 }
1119
1120 struct upload_pack_data {
1121         struct object_array wants;
1122         struct string_list wanted_refs;
1123         struct oid_array haves;
1124
1125         struct object_array shallows;
1126         struct string_list deepen_not;
1127         int depth;
1128         timestamp_t deepen_since;
1129         int deepen_rev_list;
1130         int deepen_relative;
1131
1132         unsigned stateless_rpc : 1;
1133
1134         unsigned use_thin_pack : 1;
1135         unsigned use_ofs_delta : 1;
1136         unsigned no_progress : 1;
1137         unsigned use_include_tag : 1;
1138         unsigned done : 1;
1139 };
1140
1141 static void upload_pack_data_init(struct upload_pack_data *data)
1142 {
1143         struct object_array wants = OBJECT_ARRAY_INIT;
1144         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1145         struct oid_array haves = OID_ARRAY_INIT;
1146         struct object_array shallows = OBJECT_ARRAY_INIT;
1147         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1148
1149         memset(data, 0, sizeof(*data));
1150         data->wants = wants;
1151         data->wanted_refs = wanted_refs;
1152         data->haves = haves;
1153         data->shallows = shallows;
1154         data->deepen_not = deepen_not;
1155 }
1156
1157 static void upload_pack_data_clear(struct upload_pack_data *data)
1158 {
1159         object_array_clear(&data->wants);
1160         string_list_clear(&data->wanted_refs, 1);
1161         oid_array_clear(&data->haves);
1162         object_array_clear(&data->shallows);
1163         string_list_clear(&data->deepen_not, 0);
1164 }
1165
1166 static int parse_want(const char *line)
1167 {
1168         const char *arg;
1169         if (skip_prefix(line, "want ", &arg)) {
1170                 struct object_id oid;
1171                 struct object *o;
1172
1173                 if (get_oid_hex(arg, &oid))
1174                         die("git upload-pack: protocol error, "
1175                             "expected to get oid, not '%s'", line);
1176
1177                 o = parse_object(&oid);
1178                 if (!o) {
1179                         packet_write_fmt(1,
1180                                          "ERR upload-pack: not our ref %s",
1181                                          oid_to_hex(&oid));
1182                         die("git upload-pack: not our ref %s",
1183                             oid_to_hex(&oid));
1184                 }
1185
1186                 if (!(o->flags & WANTED)) {
1187                         o->flags |= WANTED;
1188                         add_object_array(o, NULL, &want_obj);
1189                 }
1190
1191                 return 1;
1192         }
1193
1194         return 0;
1195 }
1196
1197 static int parse_want_ref(const char *line, struct string_list *wanted_refs)
1198 {
1199         const char *arg;
1200         if (skip_prefix(line, "want-ref ", &arg)) {
1201                 struct object_id oid;
1202                 struct string_list_item *item;
1203                 struct object *o;
1204
1205                 if (read_ref(arg, &oid)) {
1206                         packet_write_fmt(1, "ERR unknown ref %s", arg);
1207                         die("unknown ref %s", arg);
1208                 }
1209
1210                 item = string_list_append(wanted_refs, arg);
1211                 item->util = oiddup(&oid);
1212
1213                 o = parse_object_or_die(&oid, arg);
1214                 if (!(o->flags & WANTED)) {
1215                         o->flags |= WANTED;
1216                         add_object_array(o, NULL, &want_obj);
1217                 }
1218
1219                 return 1;
1220         }
1221
1222         return 0;
1223 }
1224
1225 static int parse_have(const char *line, struct oid_array *haves)
1226 {
1227         const char *arg;
1228         if (skip_prefix(line, "have ", &arg)) {
1229                 struct object_id oid;
1230
1231                 if (get_oid_hex(arg, &oid))
1232                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1233                 oid_array_append(haves, &oid);
1234                 return 1;
1235         }
1236
1237         return 0;
1238 }
1239
1240 static void process_args(struct packet_reader *request,
1241                          struct upload_pack_data *data)
1242 {
1243         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1244                 const char *arg = request->line;
1245                 const char *p;
1246
1247                 /* process want */
1248                 if (parse_want(arg))
1249                         continue;
1250                 if (allow_ref_in_want && parse_want_ref(arg, &data->wanted_refs))
1251                         continue;
1252                 /* process have line */
1253                 if (parse_have(arg, &data->haves))
1254                         continue;
1255
1256                 /* process args like thin-pack */
1257                 if (!strcmp(arg, "thin-pack")) {
1258                         use_thin_pack = 1;
1259                         continue;
1260                 }
1261                 if (!strcmp(arg, "ofs-delta")) {
1262                         use_ofs_delta = 1;
1263                         continue;
1264                 }
1265                 if (!strcmp(arg, "no-progress")) {
1266                         no_progress = 1;
1267                         continue;
1268                 }
1269                 if (!strcmp(arg, "include-tag")) {
1270                         use_include_tag = 1;
1271                         continue;
1272                 }
1273                 if (!strcmp(arg, "done")) {
1274                         data->done = 1;
1275                         continue;
1276                 }
1277
1278                 /* Shallow related arguments */
1279                 if (process_shallow(arg, &data->shallows))
1280                         continue;
1281                 if (process_deepen(arg, &data->depth))
1282                         continue;
1283                 if (process_deepen_since(arg, &data->deepen_since,
1284                                          &data->deepen_rev_list))
1285                         continue;
1286                 if (process_deepen_not(arg, &data->deepen_not,
1287                                        &data->deepen_rev_list))
1288                         continue;
1289                 if (!strcmp(arg, "deepen-relative")) {
1290                         data->deepen_relative = 1;
1291                         continue;
1292                 }
1293
1294                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1295                         parse_list_objects_filter(&filter_options, p);
1296                         continue;
1297                 }
1298
1299                 /* ignore unknown lines maybe? */
1300                 die("unexpected line: '%s'", arg);
1301         }
1302 }
1303
1304 static int process_haves(struct oid_array *haves, struct oid_array *common)
1305 {
1306         int i;
1307
1308         /* Process haves */
1309         for (i = 0; i < haves->nr; i++) {
1310                 const struct object_id *oid = &haves->oid[i];
1311                 struct object *o;
1312                 int we_knew_they_have = 0;
1313
1314                 if (!has_object_file(oid))
1315                         continue;
1316
1317                 oid_array_append(common, oid);
1318
1319                 o = parse_object(oid);
1320                 if (!o)
1321                         die("oops (%s)", oid_to_hex(oid));
1322                 if (o->type == OBJ_COMMIT) {
1323                         struct commit_list *parents;
1324                         struct commit *commit = (struct commit *)o;
1325                         if (o->flags & THEY_HAVE)
1326                                 we_knew_they_have = 1;
1327                         else
1328                                 o->flags |= THEY_HAVE;
1329                         if (!oldest_have || (commit->date < oldest_have))
1330                                 oldest_have = commit->date;
1331                         for (parents = commit->parents;
1332                              parents;
1333                              parents = parents->next)
1334                                 parents->item->object.flags |= THEY_HAVE;
1335                 }
1336                 if (!we_knew_they_have)
1337                         add_object_array(o, NULL, &have_obj);
1338         }
1339
1340         return 0;
1341 }
1342
1343 static int send_acks(struct oid_array *acks, struct strbuf *response)
1344 {
1345         int i;
1346
1347         packet_buf_write(response, "acknowledgments\n");
1348
1349         /* Send Acks */
1350         if (!acks->nr)
1351                 packet_buf_write(response, "NAK\n");
1352
1353         for (i = 0; i < acks->nr; i++) {
1354                 packet_buf_write(response, "ACK %s\n",
1355                                  oid_to_hex(&acks->oid[i]));
1356         }
1357
1358         if (ok_to_give_up()) {
1359                 /* Send Ready */
1360                 packet_buf_write(response, "ready\n");
1361                 return 1;
1362         }
1363
1364         return 0;
1365 }
1366
1367 static int process_haves_and_send_acks(struct upload_pack_data *data)
1368 {
1369         struct oid_array common = OID_ARRAY_INIT;
1370         struct strbuf response = STRBUF_INIT;
1371         int ret = 0;
1372
1373         process_haves(&data->haves, &common);
1374         if (data->done) {
1375                 ret = 1;
1376         } else if (send_acks(&common, &response)) {
1377                 packet_buf_delim(&response);
1378                 ret = 1;
1379         } else {
1380                 /* Add Flush */
1381                 packet_buf_flush(&response);
1382                 ret = 0;
1383         }
1384
1385         /* Send response */
1386         write_or_die(1, response.buf, response.len);
1387         strbuf_release(&response);
1388
1389         oid_array_clear(&data->haves);
1390         oid_array_clear(&common);
1391         return ret;
1392 }
1393
1394 static void send_wanted_ref_info(struct upload_pack_data *data)
1395 {
1396         const struct string_list_item *item;
1397
1398         if (!data->wanted_refs.nr)
1399                 return;
1400
1401         packet_write_fmt(1, "wanted-refs\n");
1402
1403         for_each_string_list_item(item, &data->wanted_refs) {
1404                 packet_write_fmt(1, "%s %s\n",
1405                                  oid_to_hex(item->util),
1406                                  item->string);
1407         }
1408
1409         packet_delim(1);
1410 }
1411
1412 static void send_shallow_info(struct upload_pack_data *data)
1413 {
1414         /* No shallow info needs to be sent */
1415         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1416             !is_repository_shallow(the_repository))
1417                 return;
1418
1419         packet_write_fmt(1, "shallow-info\n");
1420
1421         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1422                                data->deepen_since, &data->deepen_not,
1423                                &data->shallows) &&
1424             is_repository_shallow(the_repository))
1425                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
1426
1427         packet_delim(1);
1428 }
1429
1430 enum fetch_state {
1431         FETCH_PROCESS_ARGS = 0,
1432         FETCH_SEND_ACKS,
1433         FETCH_SEND_PACK,
1434         FETCH_DONE,
1435 };
1436
1437 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1438                    struct packet_reader *request)
1439 {
1440         enum fetch_state state = FETCH_PROCESS_ARGS;
1441         struct upload_pack_data data;
1442
1443         git_config(upload_pack_config, NULL);
1444
1445         upload_pack_data_init(&data);
1446         use_sideband = LARGE_PACKET_MAX;
1447
1448         while (state != FETCH_DONE) {
1449                 switch (state) {
1450                 case FETCH_PROCESS_ARGS:
1451                         process_args(request, &data);
1452
1453                         if (!want_obj.nr) {
1454                                 /*
1455                                  * Request didn't contain any 'want' lines,
1456                                  * guess they didn't want anything.
1457                                  */
1458                                 state = FETCH_DONE;
1459                         } else if (data.haves.nr) {
1460                                 /*
1461                                  * Request had 'have' lines, so lets ACK them.
1462                                  */
1463                                 state = FETCH_SEND_ACKS;
1464                         } else {
1465                                 /*
1466                                  * Request had 'want's but no 'have's so we can
1467                                  * immedietly go to construct and send a pack.
1468                                  */
1469                                 state = FETCH_SEND_PACK;
1470                         }
1471                         break;
1472                 case FETCH_SEND_ACKS:
1473                         if (process_haves_and_send_acks(&data))
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);
1481
1482                         packet_write_fmt(1, "packfile\n");
1483                         create_pack_file();
1484                         state = FETCH_DONE;
1485                         break;
1486                 case FETCH_DONE:
1487                         continue;
1488                 }
1489         }
1490
1491         upload_pack_data_clear(&data);
1492         return 0;
1493 }
1494
1495 int upload_pack_advertise(struct repository *r,
1496                           struct strbuf *value)
1497 {
1498         if (value) {
1499                 int allow_filter_value;
1500                 int allow_ref_in_want;
1501
1502                 strbuf_addstr(value, "shallow");
1503
1504                 if (!repo_config_get_bool(the_repository,
1505                                          "uploadpack.allowfilter",
1506                                          &allow_filter_value) &&
1507                     allow_filter_value)
1508                         strbuf_addstr(value, " filter");
1509
1510                 if (!repo_config_get_bool(the_repository,
1511                                          "uploadpack.allowrefinwant",
1512                                          &allow_ref_in_want) &&
1513                     allow_ref_in_want)
1514                         strbuf_addstr(value, " ref-in-want");
1515         }
1516
1517         return 1;
1518 }