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
  28 /* Remember to update object flag allocation in object.h */
  29 #define THEY_HAVE       (1u << 11)
  30 #define OUR_REF         (1u << 12)
  31 #define WANTED          (1u << 13)
  32 #define COMMON_KNOWN    (1u << 14)
  33 #define REACHABLE       (1u << 15)
  34
  35 #define SHALLOW         (1u << 16)
  36 #define NOT_SHALLOW     (1u << 17)
  37 #define CLIENT_SHALLOW  (1u << 18)
  38 #define HIDDEN_REF      (1u << 19)
  39
  40 static timestamp_t oldest_have;
  41
  42 static int deepen_relative;
  43 static int multi_ack;
  44 static int no_done;
  45 static int use_thin_pack, use_ofs_delta, use_include_tag;
  46 static int no_progress, daemon_mode;
  47 /* Allow specifying sha1 if it is a ref tip. */
  48 #define ALLOW_TIP_SHA1  01
  49 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  50 #define ALLOW_REACHABLE_SHA1    02
  51 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  52 #define ALLOW_ANY_SHA1  07
  53 static unsigned int allow_unadvertised_object_request;
  54 static int shallow_nr;
  55 static struct object_array have_obj;
  56 static struct object_array want_obj;
  57 static struct object_array extra_edge_obj;
  58 static unsigned int timeout;
  59 static int keepalive = 5;
  60 /* 0 for no sideband,
  61  * otherwise maximum packet size (up to 65520 bytes).
  62  */
  63 static int use_sideband;
  64 static int stateless_rpc;
  65 static const char *pack_objects_hook;
  66
  67 static int filter_capability_requested;
  68 static int allow_filter;
  69 static 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(the_repository, 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 *from, unsigned int with_flag,
 340                      unsigned int assign_flag, time_t min_commit_date)
 341 {
 342         struct prio_queue work = { compare_commits_by_commit_date };
 343
 344         prio_queue_put(&work, from);
 345         while (work.nr) {
 346                 struct commit_list *list;
 347                 struct commit *commit = prio_queue_get(&work);
 348
 349                 if (commit->object.flags & with_flag) {
 350                         from->object.flags |= assign_flag;
 351                         break;
 352                 }
 353                 if (!commit->object.parsed)
 354                         parse_object(the_repository, &commit->object.oid);
 355                 if (commit->object.flags & REACHABLE)
 356                         continue;
 357                 commit->object.flags |= REACHABLE;
 358                 if (commit->date < min_commit_date)
 359                         continue;
 360                 for (list = commit->parents; list; list = list->next) {
 361                         struct commit *parent = list->item;
 362                         if (!(parent->object.flags & REACHABLE))
 363                                 prio_queue_put(&work, parent);
 364                 }
 365         }
 366         from->object.flags |= REACHABLE;
 367         clear_commit_marks(from, REACHABLE);
 368         clear_prio_queue(&work);
 369         return (from->object.flags & assign_flag);
 370 }
 371
 372 /*
 373  * Determine if every commit in 'from' can reach at least one commit
 374  * that is marked with 'with_flag'. As we traverse, use 'assign_flag'
 375  * as a marker for commits that are already visited. Do not walk
 376  * commits with date below 'min_commit_date'.
 377  */
 378 static int can_all_from_reach_with_flag(struct object_array *from,
 379                                         unsigned int with_flag,
 380                                         unsigned int assign_flag,
 381                                         time_t min_commit_date)
 382 {
 383         int i;
 384
 385         for (i = 0; i < from->nr; i++) {
 386                 struct object *from_one = from->objects[i].item;
 387
 388                 if (from_one->flags & assign_flag)
 389                         continue;
 390                 from_one = deref_tag(the_repository, from_one, "a from object", 0);
 391                 if (!from_one || from_one->type != OBJ_COMMIT) {
 392                         /* no way to tell if this is reachable by
 393                          * looking at the ancestry chain alone, so
 394                          * leave a note to ourselves not to worry about
 395                          * this object anymore.
 396                          */
 397                         from->objects[i].item->flags |= assign_flag;
 398                         continue;
 399                 }
 400                 if (!reachable((struct commit *)from_one, with_flag, assign_flag,
 401                                min_commit_date))
 402                         return 0;
 403         }
 404         return 1;
 405 }
 406
 407 static int ok_to_give_up(void)
 408 {
 409         if (!have_obj.nr)
 410                 return 0;
 411
 412         return can_all_from_reach_with_flag(&want_obj, THEY_HAVE,
 413                                             COMMON_KNOWN, oldest_have);
 414 }
 415
 416 static int get_common_commits(void)
 417 {
 418         struct object_id oid;
 419         char last_hex[GIT_MAX_HEXSZ + 1];
 420         int got_common = 0;
 421         int got_other = 0;
 422         int sent_ready = 0;
 423
 424         save_commit_buffer = 0;
 425
 426         for (;;) {
 427                 char *line = packet_read_line(0, NULL);
 428                 const char *arg;
 429
 430                 reset_timeout();
 431
 432                 if (!line) {
 433                         if (multi_ack == 2 && got_common
 434                             && !got_other && ok_to_give_up()) {
 435                                 sent_ready = 1;
 436                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 437                         }
 438                         if (have_obj.nr == 0 || multi_ack)
 439                                 packet_write_fmt(1, "NAK\n");
 440
 441                         if (no_done && sent_ready) {
 442                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 443                                 return 0;
 444                         }
 445                         if (stateless_rpc)
 446                                 exit(0);
 447                         got_common = 0;
 448                         got_other = 0;
 449                         continue;
 450                 }
 451                 if (skip_prefix(line, "have ", &arg)) {
 452                         switch (got_oid(arg, &oid)) {
 453                         case -1: /* they have what we do not */
 454                                 got_other = 1;
 455                                 if (multi_ack && ok_to_give_up()) {
 456                                         const char *hex = oid_to_hex(&oid);
 457                                         if (multi_ack == 2) {
 458                                                 sent_ready = 1;
 459                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 460                                         } else
 461                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 462                                 }
 463                                 break;
 464                         default:
 465                                 got_common = 1;
 466                                 oid_to_hex_r(last_hex, &oid);
 467                                 if (multi_ack == 2)
 468                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 469                                 else if (multi_ack)
 470                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 471                                 else if (have_obj.nr == 1)
 472                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 473                                 break;
 474                         }
 475                         continue;
 476                 }
 477                 if (!strcmp(line, "done")) {
 478                         if (have_obj.nr > 0) {
 479                                 if (multi_ack)
 480                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 481                                 return 0;
 482                         }
 483                         packet_write_fmt(1, "NAK\n");
 484                         return -1;
 485                 }
 486                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 487         }
 488 }
 489
 490 static int is_our_ref(struct object *o)
 491 {
 492         int allow_hidden_ref = (allow_unadvertised_object_request &
 493                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 494         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 495 }
 496
 497 /*
 498  * on successful case, it's up to the caller to close cmd->out
 499  */
 500 static int do_reachable_revlist(struct child_process *cmd,
 501                                 struct object_array *src,
 502                                 struct object_array *reachable)
 503 {
 504         static const char *argv[] = {
 505                 "rev-list", "--stdin", NULL,
 506         };
 507         struct object *o;
 508         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 509         int i;
 510
 511         cmd->argv = argv;
 512         cmd->git_cmd = 1;
 513         cmd->no_stderr = 1;
 514         cmd->in = -1;
 515         cmd->out = -1;
 516
 517         /*
 518          * If the next rev-list --stdin encounters an unknown commit,
 519          * it terminates, which will cause SIGPIPE in the write loop
 520          * below.
 521          */
 522         sigchain_push(SIGPIPE, SIG_IGN);
 523
 524         if (start_command(cmd))
 525                 goto error;
 526
 527         namebuf[0] = '^';
 528         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 529         for (i = get_max_object_index(); 0 < i; ) {
 530                 o = get_indexed_object(--i);
 531                 if (!o)
 532                         continue;
 533                 if (reachable && o->type == OBJ_COMMIT)
 534                         o->flags &= ~TMP_MARK;
 535                 if (!is_our_ref(o))
 536                         continue;
 537                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 538                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 539                         goto error;
 540         }
 541         namebuf[GIT_SHA1_HEXSZ] = '\n';
 542         for (i = 0; i < src->nr; i++) {
 543                 o = src->objects[i].item;
 544                 if (is_our_ref(o)) {
 545                         if (reachable)
 546                                 add_object_array(o, NULL, reachable);
 547                         continue;
 548                 }
 549                 if (reachable && o->type == OBJ_COMMIT)
 550                         o->flags |= TMP_MARK;
 551                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 552                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 553                         goto error;
 554         }
 555         close(cmd->in);
 556         cmd->in = -1;
 557         sigchain_pop(SIGPIPE);
 558
 559         return 0;
 560
 561 error:
 562         sigchain_pop(SIGPIPE);
 563
 564         if (cmd->in >= 0)
 565                 close(cmd->in);
 566         if (cmd->out >= 0)
 567                 close(cmd->out);
 568         return -1;
 569 }
 570
 571 static int get_reachable_list(struct object_array *src,
 572                               struct object_array *reachable)
 573 {
 574         struct child_process cmd = CHILD_PROCESS_INIT;
 575         int i;
 576         struct object *o;
 577         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 578         const unsigned hexsz = the_hash_algo->hexsz;
 579
 580         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 581                 return -1;
 582
 583         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 584                 struct object_id sha1;
 585                 const char *p;
 586
 587                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 588                         break;
 589
 590                 o = lookup_object(the_repository, sha1.hash);
 591                 if (o && o->type == OBJ_COMMIT) {
 592                         o->flags &= ~TMP_MARK;
 593                 }
 594         }
 595         for (i = get_max_object_index(); 0 < i; i--) {
 596                 o = get_indexed_object(i - 1);
 597                 if (o && o->type == OBJ_COMMIT &&
 598                     (o->flags & TMP_MARK)) {
 599                         add_object_array(o, NULL, reachable);
 600                                 o->flags &= ~TMP_MARK;
 601                 }
 602         }
 603         close(cmd.out);
 604
 605         if (finish_command(&cmd))
 606                 return -1;
 607
 608         return 0;
 609 }
 610
 611 static int has_unreachable(struct object_array *src)
 612 {
 613         struct child_process cmd = CHILD_PROCESS_INIT;
 614         char buf[1];
 615         int i;
 616
 617         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 618                 return 1;
 619
 620         /*
 621          * The commits out of the rev-list are not ancestors of
 622          * our ref.
 623          */
 624         i = read_in_full(cmd.out, buf, 1);
 625         if (i)
 626                 goto error;
 627         close(cmd.out);
 628         cmd.out = -1;
 629
 630         /*
 631          * rev-list may have died by encountering a bad commit
 632          * in the history, in which case we do want to bail out
 633          * even when it showed no commit.
 634          */
 635         if (finish_command(&cmd))
 636                 goto error;
 637
 638         /* All the non-tip ones are ancestors of what we advertised */
 639         return 0;
 640
 641 error:
 642         sigchain_pop(SIGPIPE);
 643         if (cmd.out >= 0)
 644                 close(cmd.out);
 645         return 1;
 646 }
 647
 648 static void check_non_tip(void)
 649 {
 650         int i;
 651
 652         /*
 653          * In the normal in-process case without
 654          * uploadpack.allowReachableSHA1InWant,
 655          * non-tip requests can never happen.
 656          */
 657         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 658                 goto error;
 659         if (!has_unreachable(&want_obj))
 660                 /* All the non-tip ones are ancestors of what we advertised */
 661                 return;
 662
 663 error:
 664         /* Pick one of them (we know there at least is one) */
 665         for (i = 0; i < want_obj.nr; i++) {
 666                 struct object *o = want_obj.objects[i].item;
 667                 if (!is_our_ref(o))
 668                         die("git upload-pack: not our ref %s",
 669                             oid_to_hex(&o->oid));
 670         }
 671 }
 672
 673 static void send_shallow(struct commit_list *result)
 674 {
 675         while (result) {
 676                 struct object *object = &result->item->object;
 677                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 678                         packet_write_fmt(1, "shallow %s",
 679                                          oid_to_hex(&object->oid));
 680                         register_shallow(the_repository, &object->oid);
 681                         shallow_nr++;
 682                 }
 683                 result = result->next;
 684         }
 685 }
 686
 687 static void send_unshallow(const struct object_array *shallows)
 688 {
 689         int i;
 690
 691         for (i = 0; i < shallows->nr; i++) {
 692                 struct object *object = shallows->objects[i].item;
 693                 if (object->flags & NOT_SHALLOW) {
 694                         struct commit_list *parents;
 695                         packet_write_fmt(1, "unshallow %s",
 696                                          oid_to_hex(&object->oid));
 697                         object->flags &= ~CLIENT_SHALLOW;
 698                         /*
 699                          * We want to _register_ "object" as shallow, but we
 700                          * also need to traverse object's parents to deepen a
 701                          * shallow clone. Unregister it for now so we can
 702                          * parse and add the parents to the want list, then
 703                          * re-register it.
 704                          */
 705                         unregister_shallow(&object->oid);
 706                         object->parsed = 0;
 707                         parse_commit_or_die((struct commit *)object);
 708                         parents = ((struct commit *)object)->parents;
 709                         while (parents) {
 710                                 add_object_array(&parents->item->object,
 711                                                  NULL, &want_obj);
 712                                 parents = parents->next;
 713                         }
 714                         add_object_array(object, NULL, &extra_edge_obj);
 715                 }
 716                 /* make sure commit traversal conforms to client */
 717                 register_shallow(the_repository, &object->oid);
 718         }
 719 }
 720
 721 static void deepen(int depth, int deepen_relative,
 722                    struct object_array *shallows)
 723 {
 724         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 725                 int i;
 726
 727                 for (i = 0; i < shallows->nr; i++) {
 728                         struct object *object = shallows->objects[i].item;
 729                         object->flags |= NOT_SHALLOW;
 730                 }
 731         } else if (deepen_relative) {
 732                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 733                 struct commit_list *result;
 734
 735                 get_reachable_list(shallows, &reachable_shallows);
 736                 result = get_shallow_commits(&reachable_shallows,
 737                                              depth + 1,
 738                                              SHALLOW, NOT_SHALLOW);
 739                 send_shallow(result);
 740                 free_commit_list(result);
 741                 object_array_clear(&reachable_shallows);
 742         } else {
 743                 struct commit_list *result;
 744
 745                 result = get_shallow_commits(&want_obj, depth,
 746                                              SHALLOW, NOT_SHALLOW);
 747                 send_shallow(result);
 748                 free_commit_list(result);
 749         }
 750
 751         send_unshallow(shallows);
 752 }
 753
 754 static void deepen_by_rev_list(int ac, const char **av,
 755                                struct object_array *shallows)
 756 {
 757         struct commit_list *result;
 758
 759         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 760         send_shallow(result);
 761         free_commit_list(result);
 762         send_unshallow(shallows);
 763 }
 764
 765 /* Returns 1 if a shallow list is sent or 0 otherwise */
 766 static int send_shallow_list(int depth, int deepen_rev_list,
 767                              timestamp_t deepen_since,
 768                              struct string_list *deepen_not,
 769                              struct object_array *shallows)
 770 {
 771         int ret = 0;
 772
 773         if (depth > 0 && deepen_rev_list)
 774                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 775         if (depth > 0) {
 776                 deepen(depth, deepen_relative, shallows);
 777                 ret = 1;
 778         } else if (deepen_rev_list) {
 779                 struct argv_array av = ARGV_ARRAY_INIT;
 780                 int i;
 781
 782                 argv_array_push(&av, "rev-list");
 783                 if (deepen_since)
 784                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 785                 if (deepen_not->nr) {
 786                         argv_array_push(&av, "--not");
 787                         for (i = 0; i < deepen_not->nr; i++) {
 788                                 struct string_list_item *s = deepen_not->items + i;
 789                                 argv_array_push(&av, s->string);
 790                         }
 791                         argv_array_push(&av, "--not");
 792                 }
 793                 for (i = 0; i < want_obj.nr; i++) {
 794                         struct object *o = want_obj.objects[i].item;
 795                         argv_array_push(&av, oid_to_hex(&o->oid));
 796                 }
 797                 deepen_by_rev_list(av.argc, av.argv, shallows);
 798                 argv_array_clear(&av);
 799                 ret = 1;
 800         } else {
 801                 if (shallows->nr > 0) {
 802                         int i;
 803                         for (i = 0; i < shallows->nr; i++)
 804                                 register_shallow(the_repository,
 805                                                  &shallows->objects[i].item->oid);
 806                 }
 807         }
 808
 809         shallow_nr += shallows->nr;
 810         return ret;
 811 }
 812
 813 static int process_shallow(const char *line, struct object_array *shallows)
 814 {
 815         const char *arg;
 816         if (skip_prefix(line, "shallow ", &arg)) {
 817                 struct object_id oid;
 818                 struct object *object;
 819                 if (get_oid_hex(arg, &oid))
 820                         die("invalid shallow line: %s", line);
 821                 object = parse_object(the_repository, &oid);
 822                 if (!object)
 823                         return 1;
 824                 if (object->type != OBJ_COMMIT)
 825                         die("invalid shallow object %s", oid_to_hex(&oid));
 826                 if (!(object->flags & CLIENT_SHALLOW)) {
 827                         object->flags |= CLIENT_SHALLOW;
 828                         add_object_array(object, NULL, shallows);
 829                 }
 830                 return 1;
 831         }
 832
 833         return 0;
 834 }
 835
 836 static int process_deepen(const char *line, int *depth)
 837 {
 838         const char *arg;
 839         if (skip_prefix(line, "deepen ", &arg)) {
 840                 char *end = NULL;
 841                 *depth = (int)strtol(arg, &end, 0);
 842                 if (!end || *end || *depth <= 0)
 843                         die("Invalid deepen: %s", line);
 844                 return 1;
 845         }
 846
 847         return 0;
 848 }
 849
 850 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 851 {
 852         const char *arg;
 853         if (skip_prefix(line, "deepen-since ", &arg)) {
 854                 char *end = NULL;
 855                 *deepen_since = parse_timestamp(arg, &end, 0);
 856                 if (!end || *end || !deepen_since ||
 857                     /* revisions.c's max_age -1 is special */
 858                     *deepen_since == -1)
 859                         die("Invalid deepen-since: %s", line);
 860                 *deepen_rev_list = 1;
 861                 return 1;
 862         }
 863         return 0;
 864 }
 865
 866 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 867 {
 868         const char *arg;
 869         if (skip_prefix(line, "deepen-not ", &arg)) {
 870                 char *ref = NULL;
 871                 struct object_id oid;
 872                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 873                         die("git upload-pack: ambiguous deepen-not: %s", line);
 874                 string_list_append(deepen_not, ref);
 875                 free(ref);
 876                 *deepen_rev_list = 1;
 877                 return 1;
 878         }
 879         return 0;
 880 }
 881
 882 static void receive_needs(void)
 883 {
 884         struct object_array shallows = OBJECT_ARRAY_INIT;
 885         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 886         int depth = 0;
 887         int has_non_tip = 0;
 888         timestamp_t deepen_since = 0;
 889         int deepen_rev_list = 0;
 890
 891         shallow_nr = 0;
 892         for (;;) {
 893                 struct object *o;
 894                 const char *features;
 895                 struct object_id oid_buf;
 896                 char *line = packet_read_line(0, NULL);
 897                 const char *arg;
 898
 899                 reset_timeout();
 900                 if (!line)
 901                         break;
 902
 903                 if (process_shallow(line, &shallows))
 904                         continue;
 905                 if (process_deepen(line, &depth))
 906                         continue;
 907                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 908                         continue;
 909                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 910                         continue;
 911
 912                 if (skip_prefix(line, "filter ", &arg)) {
 913                         if (!filter_capability_requested)
 914                                 die("git upload-pack: filtering capability not negotiated");
 915                         parse_list_objects_filter(&filter_options, arg);
 916                         continue;
 917                 }
 918
 919                 if (!skip_prefix(line, "want ", &arg) ||
 920                     parse_oid_hex(arg, &oid_buf, &features))
 921                         die("git upload-pack: protocol error, "
 922                             "expected to get object ID, not '%s'", line);
 923
 924                 if (parse_feature_request(features, "deepen-relative"))
 925                         deepen_relative = 1;
 926                 if (parse_feature_request(features, "multi_ack_detailed"))
 927                         multi_ack = 2;
 928                 else if (parse_feature_request(features, "multi_ack"))
 929                         multi_ack = 1;
 930                 if (parse_feature_request(features, "no-done"))
 931                         no_done = 1;
 932                 if (parse_feature_request(features, "thin-pack"))
 933                         use_thin_pack = 1;
 934                 if (parse_feature_request(features, "ofs-delta"))
 935                         use_ofs_delta = 1;
 936                 if (parse_feature_request(features, "side-band-64k"))
 937                         use_sideband = LARGE_PACKET_MAX;
 938                 else if (parse_feature_request(features, "side-band"))
 939                         use_sideband = DEFAULT_PACKET_MAX;
 940                 if (parse_feature_request(features, "no-progress"))
 941                         no_progress = 1;
 942                 if (parse_feature_request(features, "include-tag"))
 943                         use_include_tag = 1;
 944                 if (allow_filter && parse_feature_request(features, "filter"))
 945                         filter_capability_requested = 1;
 946
 947                 o = parse_object(the_repository, &oid_buf);
 948                 if (!o) {
 949                         packet_write_fmt(1,
 950                                          "ERR upload-pack: not our ref %s",
 951                                          oid_to_hex(&oid_buf));
 952                         die("git upload-pack: not our ref %s",
 953                             oid_to_hex(&oid_buf));
 954                 }
 955                 if (!(o->flags & WANTED)) {
 956                         o->flags |= WANTED;
 957                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 958                               || is_our_ref(o)))
 959                                 has_non_tip = 1;
 960                         add_object_array(o, NULL, &want_obj);
 961                 }
 962         }
 963
 964         /*
 965          * We have sent all our refs already, and the other end
 966          * should have chosen out of them. When we are operating
 967          * in the stateless RPC mode, however, their choice may
 968          * have been based on the set of older refs advertised
 969          * by another process that handled the initial request.
 970          */
 971         if (has_non_tip)
 972                 check_non_tip();
 973
 974         if (!use_sideband && daemon_mode)
 975                 no_progress = 1;
 976
 977         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 978                 return;
 979
 980         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 981                               &deepen_not, &shallows))
 982                 packet_flush(1);
 983         object_array_clear(&shallows);
 984 }
 985
 986 /* return non-zero if the ref is hidden, otherwise 0 */
 987 static int mark_our_ref(const char *refname, const char *refname_full,
 988                         const struct object_id *oid)
 989 {
 990         struct object *o = lookup_unknown_object(oid->hash);
 991
 992         if (ref_is_hidden(refname, refname_full)) {
 993                 o->flags |= HIDDEN_REF;
 994                 return 1;
 995         }
 996         o->flags |= OUR_REF;
 997         return 0;
 998 }
 999
1000 static int check_ref(const char *refname_full, const struct object_id *oid,
1001                      int flag, void *cb_data)
1002 {
1003         const char *refname = strip_namespace(refname_full);
1004
1005         mark_our_ref(refname, refname_full, oid);
1006         return 0;
1007 }
1008
1009 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1010 {
1011         struct string_list_item *item;
1012
1013         if (!symref->nr)
1014                 return;
1015         for_each_string_list_item(item, symref)
1016                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1017 }
1018
1019 static int send_ref(const char *refname, const struct object_id *oid,
1020                     int flag, void *cb_data)
1021 {
1022         static const char *capabilities = "multi_ack thin-pack side-band"
1023                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1024                 " deepen-relative no-progress include-tag multi_ack_detailed";
1025         const char *refname_nons = strip_namespace(refname);
1026         struct object_id peeled;
1027
1028         if (mark_our_ref(refname_nons, refname, oid))
1029                 return 0;
1030
1031         if (capabilities) {
1032                 struct strbuf symref_info = STRBUF_INIT;
1033
1034                 format_symref_info(&symref_info, cb_data);
1035                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1036                              oid_to_hex(oid), refname_nons,
1037                              0, capabilities,
1038                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1039                                      " allow-tip-sha1-in-want" : "",
1040                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1041                                      " allow-reachable-sha1-in-want" : "",
1042                              stateless_rpc ? " no-done" : "",
1043                              symref_info.buf,
1044                              allow_filter ? " filter" : "",
1045                              git_user_agent_sanitized());
1046                 strbuf_release(&symref_info);
1047         } else {
1048                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1049         }
1050         capabilities = NULL;
1051         if (!peel_ref(refname, &peeled))
1052                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1053         return 0;
1054 }
1055
1056 static int find_symref(const char *refname, const struct object_id *oid,
1057                        int flag, void *cb_data)
1058 {
1059         const char *symref_target;
1060         struct string_list_item *item;
1061
1062         if ((flag & REF_ISSYMREF) == 0)
1063                 return 0;
1064         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1065         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1066                 die("'%s' is a symref but it is not?", refname);
1067         item = string_list_append(cb_data, refname);
1068         item->util = xstrdup(symref_target);
1069         return 0;
1070 }
1071
1072 static int upload_pack_config(const char *var, const char *value, void *unused)
1073 {
1074         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1075                 if (git_config_bool(var, value))
1076                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1077                 else
1078                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1079         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1080                 if (git_config_bool(var, value))
1081                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1082                 else
1083                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1084         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1085                 if (git_config_bool(var, value))
1086                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1087                 else
1088                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1089         } else if (!strcmp("uploadpack.keepalive", var)) {
1090                 keepalive = git_config_int(var, value);
1091                 if (!keepalive)
1092                         keepalive = -1;
1093         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1094                 if (!strcmp("uploadpack.packobjectshook", var))
1095                         return git_config_string(&pack_objects_hook, var, value);
1096         } else if (!strcmp("uploadpack.allowfilter", var)) {
1097                 allow_filter = git_config_bool(var, value);
1098         }
1099         return parse_hide_refs_config(var, value, "uploadpack");
1100 }
1101
1102 void upload_pack(struct upload_pack_options *options)
1103 {
1104         struct string_list symref = STRING_LIST_INIT_DUP;
1105
1106         stateless_rpc = options->stateless_rpc;
1107         timeout = options->timeout;
1108         daemon_mode = options->daemon_mode;
1109
1110         git_config(upload_pack_config, NULL);
1111
1112         head_ref_namespaced(find_symref, &symref);
1113
1114         if (options->advertise_refs || !stateless_rpc) {
1115                 reset_timeout();
1116                 head_ref_namespaced(send_ref, &symref);
1117                 for_each_namespaced_ref(send_ref, &symref);
1118                 advertise_shallow_grafts(1);
1119                 packet_flush(1);
1120         } else {
1121                 head_ref_namespaced(check_ref, NULL);
1122                 for_each_namespaced_ref(check_ref, NULL);
1123         }
1124         string_list_clear(&symref, 1);
1125         if (options->advertise_refs)
1126                 return;
1127
1128         receive_needs();
1129         if (want_obj.nr) {
1130                 get_common_commits();
1131                 create_pack_file();
1132         }
1133 }
1134
1135 struct upload_pack_data {
1136         struct object_array wants;
1137         struct oid_array haves;
1138
1139         struct object_array shallows;
1140         struct string_list deepen_not;
1141         int depth;
1142         timestamp_t deepen_since;
1143         int deepen_rev_list;
1144         int deepen_relative;
1145
1146         unsigned stateless_rpc : 1;
1147
1148         unsigned use_thin_pack : 1;
1149         unsigned use_ofs_delta : 1;
1150         unsigned no_progress : 1;
1151         unsigned use_include_tag : 1;
1152         unsigned done : 1;
1153 };
1154
1155 static void upload_pack_data_init(struct upload_pack_data *data)
1156 {
1157         struct object_array wants = OBJECT_ARRAY_INIT;
1158         struct oid_array haves = OID_ARRAY_INIT;
1159         struct object_array shallows = OBJECT_ARRAY_INIT;
1160         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1161
1162         memset(data, 0, sizeof(*data));
1163         data->wants = wants;
1164         data->haves = haves;
1165         data->shallows = shallows;
1166         data->deepen_not = deepen_not;
1167 }
1168
1169 static void upload_pack_data_clear(struct upload_pack_data *data)
1170 {
1171         object_array_clear(&data->wants);
1172         oid_array_clear(&data->haves);
1173         object_array_clear(&data->shallows);
1174         string_list_clear(&data->deepen_not, 0);
1175 }
1176
1177 static int parse_want(const char *line)
1178 {
1179         const char *arg;
1180         if (skip_prefix(line, "want ", &arg)) {
1181                 struct object_id oid;
1182                 struct object *o;
1183
1184                 if (get_oid_hex(arg, &oid))
1185                         die("git upload-pack: protocol error, "
1186                             "expected to get oid, not '%s'", line);
1187
1188                 o = parse_object(the_repository, &oid);
1189                 if (!o) {
1190                         packet_write_fmt(1,
1191                                          "ERR upload-pack: not our ref %s",
1192                                          oid_to_hex(&oid));
1193                         die("git upload-pack: not our ref %s",
1194                             oid_to_hex(&oid));
1195                 }
1196
1197                 if (!(o->flags & WANTED)) {
1198                         o->flags |= WANTED;
1199                         add_object_array(o, NULL, &want_obj);
1200                 }
1201
1202                 return 1;
1203         }
1204
1205         return 0;
1206 }
1207
1208 static int parse_have(const char *line, struct oid_array *haves)
1209 {
1210         const char *arg;
1211         if (skip_prefix(line, "have ", &arg)) {
1212                 struct object_id oid;
1213
1214                 if (get_oid_hex(arg, &oid))
1215                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1216                 oid_array_append(haves, &oid);
1217                 return 1;
1218         }
1219
1220         return 0;
1221 }
1222
1223 static void process_args(struct packet_reader *request,
1224                          struct upload_pack_data *data)
1225 {
1226         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1227                 const char *arg = request->line;
1228                 const char *p;
1229
1230                 /* process want */
1231                 if (parse_want(arg))
1232                         continue;
1233                 /* process have line */
1234                 if (parse_have(arg, &data->haves))
1235                         continue;
1236
1237                 /* process args like thin-pack */
1238                 if (!strcmp(arg, "thin-pack")) {
1239                         use_thin_pack = 1;
1240                         continue;
1241                 }
1242                 if (!strcmp(arg, "ofs-delta")) {
1243                         use_ofs_delta = 1;
1244                         continue;
1245                 }
1246                 if (!strcmp(arg, "no-progress")) {
1247                         no_progress = 1;
1248                         continue;
1249                 }
1250                 if (!strcmp(arg, "include-tag")) {
1251                         use_include_tag = 1;
1252                         continue;
1253                 }
1254                 if (!strcmp(arg, "done")) {
1255                         data->done = 1;
1256                         continue;
1257                 }
1258
1259                 /* Shallow related arguments */
1260                 if (process_shallow(arg, &data->shallows))
1261                         continue;
1262                 if (process_deepen(arg, &data->depth))
1263                         continue;
1264                 if (process_deepen_since(arg, &data->deepen_since,
1265                                          &data->deepen_rev_list))
1266                         continue;
1267                 if (process_deepen_not(arg, &data->deepen_not,
1268                                        &data->deepen_rev_list))
1269                         continue;
1270                 if (!strcmp(arg, "deepen-relative")) {
1271                         data->deepen_relative = 1;
1272                         continue;
1273                 }
1274
1275                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1276                         parse_list_objects_filter(&filter_options, p);
1277                         continue;
1278                 }
1279
1280                 /* ignore unknown lines maybe? */
1281                 die("unexpected line: '%s'", arg);
1282         }
1283 }
1284
1285 static int process_haves(struct oid_array *haves, struct oid_array *common)
1286 {
1287         int i;
1288
1289         /* Process haves */
1290         for (i = 0; i < haves->nr; i++) {
1291                 const struct object_id *oid = &haves->oid[i];
1292                 struct object *o;
1293                 int we_knew_they_have = 0;
1294
1295                 if (!has_object_file(oid))
1296                         continue;
1297
1298                 oid_array_append(common, oid);
1299
1300                 o = parse_object(the_repository, oid);
1301                 if (!o)
1302                         die("oops (%s)", oid_to_hex(oid));
1303                 if (o->type == OBJ_COMMIT) {
1304                         struct commit_list *parents;
1305                         struct commit *commit = (struct commit *)o;
1306                         if (o->flags & THEY_HAVE)
1307                                 we_knew_they_have = 1;
1308                         else
1309                                 o->flags |= THEY_HAVE;
1310                         if (!oldest_have || (commit->date < oldest_have))
1311                                 oldest_have = commit->date;
1312                         for (parents = commit->parents;
1313                              parents;
1314                              parents = parents->next)
1315                                 parents->item->object.flags |= THEY_HAVE;
1316                 }
1317                 if (!we_knew_they_have)
1318                         add_object_array(o, NULL, &have_obj);
1319         }
1320
1321         return 0;
1322 }
1323
1324 static int send_acks(struct oid_array *acks, struct strbuf *response)
1325 {
1326         int i;
1327
1328         packet_buf_write(response, "acknowledgments\n");
1329
1330         /* Send Acks */
1331         if (!acks->nr)
1332                 packet_buf_write(response, "NAK\n");
1333
1334         for (i = 0; i < acks->nr; i++) {
1335                 packet_buf_write(response, "ACK %s\n",
1336                                  oid_to_hex(&acks->oid[i]));
1337         }
1338
1339         if (ok_to_give_up()) {
1340                 /* Send Ready */
1341                 packet_buf_write(response, "ready\n");
1342                 return 1;
1343         }
1344
1345         return 0;
1346 }
1347
1348 static int process_haves_and_send_acks(struct upload_pack_data *data)
1349 {
1350         struct oid_array common = OID_ARRAY_INIT;
1351         struct strbuf response = STRBUF_INIT;
1352         int ret = 0;
1353
1354         process_haves(&data->haves, &common);
1355         if (data->done) {
1356                 ret = 1;
1357         } else if (send_acks(&common, &response)) {
1358                 packet_buf_delim(&response);
1359                 ret = 1;
1360         } else {
1361                 /* Add Flush */
1362                 packet_buf_flush(&response);
1363                 ret = 0;
1364         }
1365
1366         /* Send response */
1367         write_or_die(1, response.buf, response.len);
1368         strbuf_release(&response);
1369
1370         oid_array_clear(&data->haves);
1371         oid_array_clear(&common);
1372         return ret;
1373 }
1374
1375 static void send_shallow_info(struct upload_pack_data *data)
1376 {
1377         /* No shallow info needs to be sent */
1378         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1379             !is_repository_shallow(the_repository))
1380                 return;
1381
1382         packet_write_fmt(1, "shallow-info\n");
1383
1384         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1385                                data->deepen_since, &data->deepen_not,
1386                                &data->shallows) &&
1387             is_repository_shallow(the_repository))
1388                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
1389
1390         packet_delim(1);
1391 }
1392
1393 enum fetch_state {
1394         FETCH_PROCESS_ARGS = 0,
1395         FETCH_SEND_ACKS,
1396         FETCH_SEND_PACK,
1397         FETCH_DONE,
1398 };
1399
1400 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1401                    struct packet_reader *request)
1402 {
1403         enum fetch_state state = FETCH_PROCESS_ARGS;
1404         struct upload_pack_data data;
1405
1406         git_config(upload_pack_config, NULL);
1407
1408         upload_pack_data_init(&data);
1409         use_sideband = LARGE_PACKET_MAX;
1410
1411         while (state != FETCH_DONE) {
1412                 switch (state) {
1413                 case FETCH_PROCESS_ARGS:
1414                         process_args(request, &data);
1415
1416                         if (!want_obj.nr) {
1417                                 /*
1418                                  * Request didn't contain any 'want' lines,
1419                                  * guess they didn't want anything.
1420                                  */
1421                                 state = FETCH_DONE;
1422                         } else if (data.haves.nr) {
1423                                 /*
1424                                  * Request had 'have' lines, so lets ACK them.
1425                                  */
1426                                 state = FETCH_SEND_ACKS;
1427                         } else {
1428                                 /*
1429                                  * Request had 'want's but no 'have's so we can
1430                                  * immedietly go to construct and send a pack.
1431                                  */
1432                                 state = FETCH_SEND_PACK;
1433                         }
1434                         break;
1435                 case FETCH_SEND_ACKS:
1436                         if (process_haves_and_send_acks(&data))
1437                                 state = FETCH_SEND_PACK;
1438                         else
1439                                 state = FETCH_DONE;
1440                         break;
1441                 case FETCH_SEND_PACK:
1442                         send_shallow_info(&data);
1443
1444                         packet_write_fmt(1, "packfile\n");
1445                         create_pack_file();
1446                         state = FETCH_DONE;
1447                         break;
1448                 case FETCH_DONE:
1449                         continue;
1450                 }
1451         }
1452
1453         upload_pack_data_clear(&data);
1454         return 0;
1455 }
1456
1457 int upload_pack_advertise(struct repository *r,
1458                           struct strbuf *value)
1459 {
1460         if (value) {
1461                 int allow_filter_value;
1462                 strbuf_addstr(value, "shallow");
1463                 if (!repo_config_get_bool(the_repository,
1464                                          "uploadpack.allowfilter",
1465                                          &allow_filter_value) &&
1466                     allow_filter_value)
1467                         strbuf_addstr(value, " filter");
1468         }
1469         return 1;
1470 }