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 "tag.h"
   7 #include "object.h"
   8 #include "commit.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "list-objects.h"
  12 #include "list-objects-filter.h"
  13 #include "list-objects-filter-options.h"
  14 #include "run-command.h"
  15 #include "connect.h"
  16 #include "sigchain.h"
  17 #include "version.h"
  18 #include "string-list.h"
  19 #include "argv-array.h"
  20 #include "prio-queue.h"
  21 #include "protocol.h"
  22 #include "quote.h"
  23 #include "upload-pack.h"
  24 #include "serve.h"
  25
  26 /* Remember to update object flag allocation in object.h */
  27 #define THEY_HAVE       (1u << 11)
  28 #define OUR_REF         (1u << 12)
  29 #define WANTED          (1u << 13)
  30 #define COMMON_KNOWN    (1u << 14)
  31 #define REACHABLE       (1u << 15)
  32
  33 #define SHALLOW         (1u << 16)
  34 #define NOT_SHALLOW     (1u << 17)
  35 #define CLIENT_SHALLOW  (1u << 18)
  36 #define HIDDEN_REF      (1u << 19)
  37
  38 static timestamp_t oldest_have;
  39
  40 static int deepen_relative;
  41 static int multi_ack;
  42 static int no_done;
  43 static int use_thin_pack, use_ofs_delta, use_include_tag;
  44 static int no_progress, daemon_mode;
  45 /* Allow specifying sha1 if it is a ref tip. */
  46 #define ALLOW_TIP_SHA1  01
  47 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  48 #define ALLOW_REACHABLE_SHA1    02
  49 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  50 #define ALLOW_ANY_SHA1  07
  51 static unsigned int allow_unadvertised_object_request;
  52 static int shallow_nr;
  53 static struct object_array have_obj;
  54 static struct object_array want_obj;
  55 static struct object_array extra_edge_obj;
  56 static unsigned int timeout;
  57 static int keepalive = 5;
  58 /* 0 for no sideband,
  59  * otherwise maximum packet size (up to 65520 bytes).
  60  */
  61 static int use_sideband;
  62 static int stateless_rpc;
  63 static const char *pack_objects_hook;
  64
  65 static int filter_capability_requested;
  66 static int allow_filter;
  67 static int allow_ref_in_want;
  68 static struct list_objects_filter_options filter_options;
  69
  70 static void reset_timeout(void)
  71 {
  72         alarm(timeout);
  73 }
  74
  75 static void send_client_data(int fd, const char *data, ssize_t sz)
  76 {
  77         if (use_sideband) {
  78                 send_sideband(1, fd, data, sz, use_sideband);
  79                 return;
  80         }
  81         if (fd == 3)
  82                 /* emergency quit */
  83                 fd = 2;
  84         if (fd == 2) {
  85                 /* XXX: are we happy to lose stuff here? */
  86                 xwrite(fd, data, sz);
  87                 return;
  88         }
  89         write_or_die(fd, data, sz);
  90 }
  91
  92 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  93 {
  94         FILE *fp = cb_data;
  95         if (graft->nr_parent == -1)
  96                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  97         return 0;
  98 }
  99
 100 static void create_pack_file(void)
 101 {
 102         struct child_process pack_objects = CHILD_PROCESS_INIT;
 103         char data[8193], progress[128];
 104         char abort_msg[] = "aborting due to possible repository "
 105                 "corruption on the remote side.";
 106         int buffered = -1;
 107         ssize_t sz;
 108         int i;
 109         FILE *pipe_fd;
 110
 111         if (!pack_objects_hook)
 112                 pack_objects.git_cmd = 1;
 113         else {
 114                 argv_array_push(&pack_objects.args, pack_objects_hook);
 115                 argv_array_push(&pack_objects.args, "git");
 116                 pack_objects.use_shell = 1;
 117         }
 118
 119         if (shallow_nr) {
 120                 argv_array_push(&pack_objects.args, "--shallow-file");
 121                 argv_array_push(&pack_objects.args, "");
 122         }
 123         argv_array_push(&pack_objects.args, "pack-objects");
 124         argv_array_push(&pack_objects.args, "--revs");
 125         if (use_thin_pack)
 126                 argv_array_push(&pack_objects.args, "--thin");
 127
 128         argv_array_push(&pack_objects.args, "--stdout");
 129         if (shallow_nr)
 130                 argv_array_push(&pack_objects.args, "--shallow");
 131         if (!no_progress)
 132                 argv_array_push(&pack_objects.args, "--progress");
 133         if (use_ofs_delta)
 134                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 135         if (use_include_tag)
 136                 argv_array_push(&pack_objects.args, "--include-tag");
 137         if (filter_options.filter_spec) {
 138                 if (pack_objects.use_shell) {
 139                         struct strbuf buf = STRBUF_INIT;
 140                         sq_quote_buf(&buf, filter_options.filter_spec);
 141                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 142                         strbuf_release(&buf);
 143                 } else {
 144                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 145                                          filter_options.filter_spec);
 146                 }
 147         }
 148
 149         pack_objects.in = -1;
 150         pack_objects.out = -1;
 151         pack_objects.err = -1;
 152
 153         if (start_command(&pack_objects))
 154                 die("git upload-pack: unable to fork git-pack-objects");
 155
 156         pipe_fd = xfdopen(pack_objects.in, "w");
 157
 158         if (shallow_nr)
 159                 for_each_commit_graft(write_one_shallow, pipe_fd);
 160
 161         for (i = 0; i < want_obj.nr; i++)
 162                 fprintf(pipe_fd, "%s\n",
 163                         oid_to_hex(&want_obj.objects[i].item->oid));
 164         fprintf(pipe_fd, "--not\n");
 165         for (i = 0; i < have_obj.nr; i++)
 166                 fprintf(pipe_fd, "%s\n",
 167                         oid_to_hex(&have_obj.objects[i].item->oid));
 168         for (i = 0; i < extra_edge_obj.nr; i++)
 169                 fprintf(pipe_fd, "%s\n",
 170                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 171         fprintf(pipe_fd, "\n");
 172         fflush(pipe_fd);
 173         fclose(pipe_fd);
 174
 175         /* We read from pack_objects.err to capture stderr output for
 176          * progress bar, and pack_objects.out to capture the pack data.
 177          */
 178
 179         while (1) {
 180                 struct pollfd pfd[2];
 181                 int pe, pu, pollsize;
 182                 int ret;
 183
 184                 reset_timeout();
 185
 186                 pollsize = 0;
 187                 pe = pu = -1;
 188
 189                 if (0 <= pack_objects.out) {
 190                         pfd[pollsize].fd = pack_objects.out;
 191                         pfd[pollsize].events = POLLIN;
 192                         pu = pollsize;
 193                         pollsize++;
 194                 }
 195                 if (0 <= pack_objects.err) {
 196                         pfd[pollsize].fd = pack_objects.err;
 197                         pfd[pollsize].events = POLLIN;
 198                         pe = pollsize;
 199                         pollsize++;
 200                 }
 201
 202                 if (!pollsize)
 203                         break;
 204
 205                 ret = poll(pfd, pollsize,
 206                         keepalive < 0 ? -1 : 1000 * keepalive);
 207
 208                 if (ret < 0) {
 209                         if (errno != EINTR) {
 210                                 error_errno("poll failed, resuming");
 211                                 sleep(1);
 212                         }
 213                         continue;
 214                 }
 215                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 216                         /* Status ready; we ship that in the side-band
 217                          * or dump to the standard error.
 218                          */
 219                         sz = xread(pack_objects.err, progress,
 220                                   sizeof(progress));
 221                         if (0 < sz)
 222                                 send_client_data(2, progress, sz);
 223                         else if (sz == 0) {
 224                                 close(pack_objects.err);
 225                                 pack_objects.err = -1;
 226                         }
 227                         else
 228                                 goto fail;
 229                         /* give priority to status messages */
 230                         continue;
 231                 }
 232                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 233                         /* Data ready; we keep the last byte to ourselves
 234                          * in case we detect broken rev-list, so that we
 235                          * can leave the stream corrupted.  This is
 236                          * unfortunate -- unpack-objects would happily
 237                          * accept a valid packdata with trailing garbage,
 238                          * so appending garbage after we pass all the
 239                          * pack data is not good enough to signal
 240                          * breakage to downstream.
 241                          */
 242                         char *cp = data;
 243                         ssize_t outsz = 0;
 244                         if (0 <= buffered) {
 245                                 *cp++ = buffered;
 246                                 outsz++;
 247                         }
 248                         sz = xread(pack_objects.out, cp,
 249                                   sizeof(data) - outsz);
 250                         if (0 < sz)
 251                                 ;
 252                         else if (sz == 0) {
 253                                 close(pack_objects.out);
 254                                 pack_objects.out = -1;
 255                         }
 256                         else
 257                                 goto fail;
 258                         sz += outsz;
 259                         if (1 < sz) {
 260                                 buffered = data[sz-1] & 0xFF;
 261                                 sz--;
 262                         }
 263                         else
 264                                 buffered = -1;
 265                         send_client_data(1, data, sz);
 266                 }
 267
 268                 /*
 269                  * We hit the keepalive timeout without saying anything; send
 270                  * an empty message on the data sideband just to let the other
 271                  * side know we're still working on it, but don't have any data
 272                  * yet.
 273                  *
 274                  * If we don't have a sideband channel, there's no room in the
 275                  * protocol to say anything, so those clients are just out of
 276                  * luck.
 277                  */
 278                 if (!ret && use_sideband) {
 279                         static const char buf[] = "0005\1";
 280                         write_or_die(1, buf, 5);
 281                 }
 282         }
 283
 284         if (finish_command(&pack_objects)) {
 285                 error("git upload-pack: git-pack-objects died with error.");
 286                 goto fail;
 287         }
 288
 289         /* flush the data */
 290         if (0 <= buffered) {
 291                 data[0] = buffered;
 292                 send_client_data(1, data, 1);
 293                 fprintf(stderr, "flushed.\n");
 294         }
 295         if (use_sideband)
 296                 packet_flush(1);
 297         return;
 298
 299  fail:
 300         send_client_data(3, abort_msg, sizeof(abort_msg));
 301         die("git upload-pack: %s", abort_msg);
 302 }
 303
 304 static int got_oid(const char *hex, struct object_id *oid)
 305 {
 306         struct object *o;
 307         int we_knew_they_have = 0;
 308
 309         if (get_oid_hex(hex, oid))
 310                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 311         if (!has_object_file(oid))
 312                 return -1;
 313
 314         o = parse_object(oid);
 315         if (!o)
 316                 die("oops (%s)", oid_to_hex(oid));
 317         if (o->type == OBJ_COMMIT) {
 318                 struct commit_list *parents;
 319                 struct commit *commit = (struct commit *)o;
 320                 if (o->flags & THEY_HAVE)
 321                         we_knew_they_have = 1;
 322                 else
 323                         o->flags |= THEY_HAVE;
 324                 if (!oldest_have || (commit->date < oldest_have))
 325                         oldest_have = commit->date;
 326                 for (parents = commit->parents;
 327                      parents;
 328                      parents = parents->next)
 329                         parents->item->object.flags |= THEY_HAVE;
 330         }
 331         if (!we_knew_they_have) {
 332                 add_object_array(o, NULL, &have_obj);
 333                 return 1;
 334         }
 335         return 0;
 336 }
 337
 338 static int reachable(struct commit *want)
 339 {
 340         struct prio_queue work = { compare_commits_by_commit_date };
 341
 342         prio_queue_put(&work, want);
 343         while (work.nr) {
 344                 struct commit_list *list;
 345                 struct commit *commit = prio_queue_get(&work);
 346
 347                 if (commit->object.flags & THEY_HAVE) {
 348                         want->object.flags |= COMMON_KNOWN;
 349                         break;
 350                 }
 351                 if (!commit->object.parsed)
 352                         parse_object(&commit->object.oid);
 353                 if (commit->object.flags & REACHABLE)
 354                         continue;
 355                 commit->object.flags |= REACHABLE;
 356                 if (commit->date < oldest_have)
 357                         continue;
 358                 for (list = commit->parents; list; list = list->next) {
 359                         struct commit *parent = list->item;
 360                         if (!(parent->object.flags & REACHABLE))
 361                                 prio_queue_put(&work, parent);
 362                 }
 363         }
 364         want->object.flags |= REACHABLE;
 365         clear_commit_marks(want, REACHABLE);
 366         clear_prio_queue(&work);
 367         return (want->object.flags & COMMON_KNOWN);
 368 }
 369
 370 static int ok_to_give_up(void)
 371 {
 372         int i;
 373
 374         if (!have_obj.nr)
 375                 return 0;
 376
 377         for (i = 0; i < want_obj.nr; i++) {
 378                 struct object *want = want_obj.objects[i].item;
 379
 380                 if (want->flags & COMMON_KNOWN)
 381                         continue;
 382                 want = deref_tag(want, "a want line", 0);
 383                 if (!want || want->type != OBJ_COMMIT) {
 384                         /* no way to tell if this is reachable by
 385                          * looking at the ancestry chain alone, so
 386                          * leave a note to ourselves not to worry about
 387                          * this object anymore.
 388                          */
 389                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 390                         continue;
 391                 }
 392                 if (!reachable((struct commit *)want))
 393                         return 0;
 394         }
 395         return 1;
 396 }
 397
 398 static int get_common_commits(void)
 399 {
 400         struct object_id oid;
 401         char last_hex[GIT_MAX_HEXSZ + 1];
 402         int got_common = 0;
 403         int got_other = 0;
 404         int sent_ready = 0;
 405
 406         save_commit_buffer = 0;
 407
 408         for (;;) {
 409                 char *line = packet_read_line(0, NULL);
 410                 const char *arg;
 411
 412                 reset_timeout();
 413
 414                 if (!line) {
 415                         if (multi_ack == 2 && got_common
 416                             && !got_other && ok_to_give_up()) {
 417                                 sent_ready = 1;
 418                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 419                         }
 420                         if (have_obj.nr == 0 || multi_ack)
 421                                 packet_write_fmt(1, "NAK\n");
 422
 423                         if (no_done && sent_ready) {
 424                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 425                                 return 0;
 426                         }
 427                         if (stateless_rpc)
 428                                 exit(0);
 429                         got_common = 0;
 430                         got_other = 0;
 431                         continue;
 432                 }
 433                 if (skip_prefix(line, "have ", &arg)) {
 434                         switch (got_oid(arg, &oid)) {
 435                         case -1: /* they have what we do not */
 436                                 got_other = 1;
 437                                 if (multi_ack && ok_to_give_up()) {
 438                                         const char *hex = oid_to_hex(&oid);
 439                                         if (multi_ack == 2) {
 440                                                 sent_ready = 1;
 441                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 442                                         } else
 443                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 444                                 }
 445                                 break;
 446                         default:
 447                                 got_common = 1;
 448                                 oid_to_hex_r(last_hex, &oid);
 449                                 if (multi_ack == 2)
 450                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 451                                 else if (multi_ack)
 452                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 453                                 else if (have_obj.nr == 1)
 454                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 455                                 break;
 456                         }
 457                         continue;
 458                 }
 459                 if (!strcmp(line, "done")) {
 460                         if (have_obj.nr > 0) {
 461                                 if (multi_ack)
 462                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 463                                 return 0;
 464                         }
 465                         packet_write_fmt(1, "NAK\n");
 466                         return -1;
 467                 }
 468                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 469         }
 470 }
 471
 472 static int is_our_ref(struct object *o)
 473 {
 474         int allow_hidden_ref = (allow_unadvertised_object_request &
 475                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 476         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 477 }
 478
 479 /*
 480  * on successful case, it's up to the caller to close cmd->out
 481  */
 482 static int do_reachable_revlist(struct child_process *cmd,
 483                                 struct object_array *src,
 484                                 struct object_array *reachable)
 485 {
 486         static const char *argv[] = {
 487                 "rev-list", "--stdin", NULL,
 488         };
 489         struct object *o;
 490         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 491         int i;
 492
 493         cmd->argv = argv;
 494         cmd->git_cmd = 1;
 495         cmd->no_stderr = 1;
 496         cmd->in = -1;
 497         cmd->out = -1;
 498
 499         /*
 500          * If the next rev-list --stdin encounters an unknown commit,
 501          * it terminates, which will cause SIGPIPE in the write loop
 502          * below.
 503          */
 504         sigchain_push(SIGPIPE, SIG_IGN);
 505
 506         if (start_command(cmd))
 507                 goto error;
 508
 509         namebuf[0] = '^';
 510         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 511         for (i = get_max_object_index(); 0 < i; ) {
 512                 o = get_indexed_object(--i);
 513                 if (!o)
 514                         continue;
 515                 if (reachable && o->type == OBJ_COMMIT)
 516                         o->flags &= ~TMP_MARK;
 517                 if (!is_our_ref(o))
 518                         continue;
 519                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 520                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 521                         goto error;
 522         }
 523         namebuf[GIT_SHA1_HEXSZ] = '\n';
 524         for (i = 0; i < src->nr; i++) {
 525                 o = src->objects[i].item;
 526                 if (is_our_ref(o)) {
 527                         if (reachable)
 528                                 add_object_array(o, NULL, reachable);
 529                         continue;
 530                 }
 531                 if (reachable && o->type == OBJ_COMMIT)
 532                         o->flags |= TMP_MARK;
 533                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 534                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 535                         goto error;
 536         }
 537         close(cmd->in);
 538         cmd->in = -1;
 539         sigchain_pop(SIGPIPE);
 540
 541         return 0;
 542
 543 error:
 544         sigchain_pop(SIGPIPE);
 545
 546         if (cmd->in >= 0)
 547                 close(cmd->in);
 548         if (cmd->out >= 0)
 549                 close(cmd->out);
 550         return -1;
 551 }
 552
 553 static int get_reachable_list(struct object_array *src,
 554                               struct object_array *reachable)
 555 {
 556         struct child_process cmd = CHILD_PROCESS_INIT;
 557         int i;
 558         struct object *o;
 559         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 560         const unsigned hexsz = the_hash_algo->hexsz;
 561
 562         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 563                 return -1;
 564
 565         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 566                 struct object_id sha1;
 567                 const char *p;
 568
 569                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 570                         break;
 571
 572                 o = lookup_object(sha1.hash);
 573                 if (o && o->type == OBJ_COMMIT) {
 574                         o->flags &= ~TMP_MARK;
 575                 }
 576         }
 577         for (i = get_max_object_index(); 0 < i; i--) {
 578                 o = get_indexed_object(i - 1);
 579                 if (o && o->type == OBJ_COMMIT &&
 580                     (o->flags & TMP_MARK)) {
 581                         add_object_array(o, NULL, reachable);
 582                                 o->flags &= ~TMP_MARK;
 583                 }
 584         }
 585         close(cmd.out);
 586
 587         if (finish_command(&cmd))
 588                 return -1;
 589
 590         return 0;
 591 }
 592
 593 static int has_unreachable(struct object_array *src)
 594 {
 595         struct child_process cmd = CHILD_PROCESS_INIT;
 596         char buf[1];
 597         int i;
 598
 599         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 600                 return 1;
 601
 602         /*
 603          * The commits out of the rev-list are not ancestors of
 604          * our ref.
 605          */
 606         i = read_in_full(cmd.out, buf, 1);
 607         if (i)
 608                 goto error;
 609         close(cmd.out);
 610         cmd.out = -1;
 611
 612         /*
 613          * rev-list may have died by encountering a bad commit
 614          * in the history, in which case we do want to bail out
 615          * even when it showed no commit.
 616          */
 617         if (finish_command(&cmd))
 618                 goto error;
 619
 620         /* All the non-tip ones are ancestors of what we advertised */
 621         return 0;
 622
 623 error:
 624         sigchain_pop(SIGPIPE);
 625         if (cmd.out >= 0)
 626                 close(cmd.out);
 627         return 1;
 628 }
 629
 630 static void check_non_tip(void)
 631 {
 632         int i;
 633
 634         /*
 635          * In the normal in-process case without
 636          * uploadpack.allowReachableSHA1InWant,
 637          * non-tip requests can never happen.
 638          */
 639         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 640                 goto error;
 641         if (!has_unreachable(&want_obj))
 642                 /* All the non-tip ones are ancestors of what we advertised */
 643                 return;
 644
 645 error:
 646         /* Pick one of them (we know there at least is one) */
 647         for (i = 0; i < want_obj.nr; i++) {
 648                 struct object *o = want_obj.objects[i].item;
 649                 if (!is_our_ref(o))
 650                         die("git upload-pack: not our ref %s",
 651                             oid_to_hex(&o->oid));
 652         }
 653 }
 654
 655 static void send_shallow(struct commit_list *result)
 656 {
 657         while (result) {
 658                 struct object *object = &result->item->object;
 659                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 660                         packet_write_fmt(1, "shallow %s",
 661                                          oid_to_hex(&object->oid));
 662                         register_shallow(&object->oid);
 663                         shallow_nr++;
 664                 }
 665                 result = result->next;
 666         }
 667 }
 668
 669 static void send_unshallow(const struct object_array *shallows)
 670 {
 671         int i;
 672
 673         for (i = 0; i < shallows->nr; i++) {
 674                 struct object *object = shallows->objects[i].item;
 675                 if (object->flags & NOT_SHALLOW) {
 676                         struct commit_list *parents;
 677                         packet_write_fmt(1, "unshallow %s",
 678                                          oid_to_hex(&object->oid));
 679                         object->flags &= ~CLIENT_SHALLOW;
 680                         /*
 681                          * We want to _register_ "object" as shallow, but we
 682                          * also need to traverse object's parents to deepen a
 683                          * shallow clone. Unregister it for now so we can
 684                          * parse and add the parents to the want list, then
 685                          * re-register it.
 686                          */
 687                         unregister_shallow(&object->oid);
 688                         object->parsed = 0;
 689                         parse_commit_or_die((struct commit *)object);
 690                         parents = ((struct commit *)object)->parents;
 691                         while (parents) {
 692                                 add_object_array(&parents->item->object,
 693                                                  NULL, &want_obj);
 694                                 parents = parents->next;
 695                         }
 696                         add_object_array(object, NULL, &extra_edge_obj);
 697                 }
 698                 /* make sure commit traversal conforms to client */
 699                 register_shallow(&object->oid);
 700         }
 701 }
 702
 703 static void deepen(int depth, int deepen_relative,
 704                    struct object_array *shallows)
 705 {
 706         if (depth == INFINITE_DEPTH && !is_repository_shallow()) {
 707                 int i;
 708
 709                 for (i = 0; i < shallows->nr; i++) {
 710                         struct object *object = shallows->objects[i].item;
 711                         object->flags |= NOT_SHALLOW;
 712                 }
 713         } else if (deepen_relative) {
 714                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 715                 struct commit_list *result;
 716
 717                 get_reachable_list(shallows, &reachable_shallows);
 718                 result = get_shallow_commits(&reachable_shallows,
 719                                              depth + 1,
 720                                              SHALLOW, NOT_SHALLOW);
 721                 send_shallow(result);
 722                 free_commit_list(result);
 723                 object_array_clear(&reachable_shallows);
 724         } else {
 725                 struct commit_list *result;
 726
 727                 result = get_shallow_commits(&want_obj, depth,
 728                                              SHALLOW, NOT_SHALLOW);
 729                 send_shallow(result);
 730                 free_commit_list(result);
 731         }
 732
 733         send_unshallow(shallows);
 734 }
 735
 736 static void deepen_by_rev_list(int ac, const char **av,
 737                                struct object_array *shallows)
 738 {
 739         struct commit_list *result;
 740
 741         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 742         send_shallow(result);
 743         free_commit_list(result);
 744         send_unshallow(shallows);
 745 }
 746
 747 /* Returns 1 if a shallow list is sent or 0 otherwise */
 748 static int send_shallow_list(int depth, int deepen_rev_list,
 749                              timestamp_t deepen_since,
 750                              struct string_list *deepen_not,
 751                              struct object_array *shallows)
 752 {
 753         int ret = 0;
 754
 755         if (depth > 0 && deepen_rev_list)
 756                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 757         if (depth > 0) {
 758                 deepen(depth, deepen_relative, shallows);
 759                 ret = 1;
 760         } else if (deepen_rev_list) {
 761                 struct argv_array av = ARGV_ARRAY_INIT;
 762                 int i;
 763
 764                 argv_array_push(&av, "rev-list");
 765                 if (deepen_since)
 766                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 767                 if (deepen_not->nr) {
 768                         argv_array_push(&av, "--not");
 769                         for (i = 0; i < deepen_not->nr; i++) {
 770                                 struct string_list_item *s = deepen_not->items + i;
 771                                 argv_array_push(&av, s->string);
 772                         }
 773                         argv_array_push(&av, "--not");
 774                 }
 775                 for (i = 0; i < want_obj.nr; i++) {
 776                         struct object *o = want_obj.objects[i].item;
 777                         argv_array_push(&av, oid_to_hex(&o->oid));
 778                 }
 779                 deepen_by_rev_list(av.argc, av.argv, shallows);
 780                 argv_array_clear(&av);
 781                 ret = 1;
 782         } else {
 783                 if (shallows->nr > 0) {
 784                         int i;
 785                         for (i = 0; i < shallows->nr; i++)
 786                                 register_shallow(&shallows->objects[i].item->oid);
 787                 }
 788         }
 789
 790         shallow_nr += shallows->nr;
 791         return ret;
 792 }
 793
 794 static int process_shallow(const char *line, struct object_array *shallows)
 795 {
 796         const char *arg;
 797         if (skip_prefix(line, "shallow ", &arg)) {
 798                 struct object_id oid;
 799                 struct object *object;
 800                 if (get_oid_hex(arg, &oid))
 801                         die("invalid shallow line: %s", line);
 802                 object = parse_object(&oid);
 803                 if (!object)
 804                         return 1;
 805                 if (object->type != OBJ_COMMIT)
 806                         die("invalid shallow object %s", oid_to_hex(&oid));
 807                 if (!(object->flags & CLIENT_SHALLOW)) {
 808                         object->flags |= CLIENT_SHALLOW;
 809                         add_object_array(object, NULL, shallows);
 810                 }
 811                 return 1;
 812         }
 813
 814         return 0;
 815 }
 816
 817 static int process_deepen(const char *line, int *depth)
 818 {
 819         const char *arg;
 820         if (skip_prefix(line, "deepen ", &arg)) {
 821                 char *end = NULL;
 822                 *depth = (int)strtol(arg, &end, 0);
 823                 if (!end || *end || *depth <= 0)
 824                         die("Invalid deepen: %s", line);
 825                 return 1;
 826         }
 827
 828         return 0;
 829 }
 830
 831 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 832 {
 833         const char *arg;
 834         if (skip_prefix(line, "deepen-since ", &arg)) {
 835                 char *end = NULL;
 836                 *deepen_since = parse_timestamp(arg, &end, 0);
 837                 if (!end || *end || !deepen_since ||
 838                     /* revisions.c's max_age -1 is special */
 839                     *deepen_since == -1)
 840                         die("Invalid deepen-since: %s", line);
 841                 *deepen_rev_list = 1;
 842                 return 1;
 843         }
 844         return 0;
 845 }
 846
 847 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 848 {
 849         const char *arg;
 850         if (skip_prefix(line, "deepen-not ", &arg)) {
 851                 char *ref = NULL;
 852                 struct object_id oid;
 853                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 854                         die("git upload-pack: ambiguous deepen-not: %s", line);
 855                 string_list_append(deepen_not, ref);
 856                 free(ref);
 857                 *deepen_rev_list = 1;
 858                 return 1;
 859         }
 860         return 0;
 861 }
 862
 863 static void receive_needs(void)
 864 {
 865         struct object_array shallows = OBJECT_ARRAY_INIT;
 866         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 867         int depth = 0;
 868         int has_non_tip = 0;
 869         timestamp_t deepen_since = 0;
 870         int deepen_rev_list = 0;
 871
 872         shallow_nr = 0;
 873         for (;;) {
 874                 struct object *o;
 875                 const char *features;
 876                 struct object_id oid_buf;
 877                 char *line = packet_read_line(0, NULL);
 878                 const char *arg;
 879
 880                 reset_timeout();
 881                 if (!line)
 882                         break;
 883
 884                 if (process_shallow(line, &shallows))
 885                         continue;
 886                 if (process_deepen(line, &depth))
 887                         continue;
 888                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 889                         continue;
 890                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 891                         continue;
 892
 893                 if (skip_prefix(line, "filter ", &arg)) {
 894                         if (!filter_capability_requested)
 895                                 die("git upload-pack: filtering capability not negotiated");
 896                         parse_list_objects_filter(&filter_options, arg);
 897                         continue;
 898                 }
 899
 900                 if (!skip_prefix(line, "want ", &arg) ||
 901                     parse_oid_hex(arg, &oid_buf, &features))
 902                         die("git upload-pack: protocol error, "
 903                             "expected to get object ID, not '%s'", line);
 904
 905                 if (parse_feature_request(features, "deepen-relative"))
 906                         deepen_relative = 1;
 907                 if (parse_feature_request(features, "multi_ack_detailed"))
 908                         multi_ack = 2;
 909                 else if (parse_feature_request(features, "multi_ack"))
 910                         multi_ack = 1;
 911                 if (parse_feature_request(features, "no-done"))
 912                         no_done = 1;
 913                 if (parse_feature_request(features, "thin-pack"))
 914                         use_thin_pack = 1;
 915                 if (parse_feature_request(features, "ofs-delta"))
 916                         use_ofs_delta = 1;
 917                 if (parse_feature_request(features, "side-band-64k"))
 918                         use_sideband = LARGE_PACKET_MAX;
 919                 else if (parse_feature_request(features, "side-band"))
 920                         use_sideband = DEFAULT_PACKET_MAX;
 921                 if (parse_feature_request(features, "no-progress"))
 922                         no_progress = 1;
 923                 if (parse_feature_request(features, "include-tag"))
 924                         use_include_tag = 1;
 925                 if (allow_filter && parse_feature_request(features, "filter"))
 926                         filter_capability_requested = 1;
 927
 928                 o = parse_object(&oid_buf);
 929                 if (!o) {
 930                         packet_write_fmt(1,
 931                                          "ERR upload-pack: not our ref %s",
 932                                          oid_to_hex(&oid_buf));
 933                         die("git upload-pack: not our ref %s",
 934                             oid_to_hex(&oid_buf));
 935                 }
 936                 if (!(o->flags & WANTED)) {
 937                         o->flags |= WANTED;
 938                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 939                               || is_our_ref(o)))
 940                                 has_non_tip = 1;
 941                         add_object_array(o, NULL, &want_obj);
 942                 }
 943         }
 944
 945         /*
 946          * We have sent all our refs already, and the other end
 947          * should have chosen out of them. When we are operating
 948          * in the stateless RPC mode, however, their choice may
 949          * have been based on the set of older refs advertised
 950          * by another process that handled the initial request.
 951          */
 952         if (has_non_tip)
 953                 check_non_tip();
 954
 955         if (!use_sideband && daemon_mode)
 956                 no_progress = 1;
 957
 958         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 959                 return;
 960
 961         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 962                               &deepen_not, &shallows))
 963                 packet_flush(1);
 964         object_array_clear(&shallows);
 965 }
 966
 967 /* return non-zero if the ref is hidden, otherwise 0 */
 968 static int mark_our_ref(const char *refname, const char *refname_full,
 969                         const struct object_id *oid)
 970 {
 971         struct object *o = lookup_unknown_object(oid->hash);
 972
 973         if (ref_is_hidden(refname, refname_full)) {
 974                 o->flags |= HIDDEN_REF;
 975                 return 1;
 976         }
 977         o->flags |= OUR_REF;
 978         return 0;
 979 }
 980
 981 static int check_ref(const char *refname_full, const struct object_id *oid,
 982                      int flag, void *cb_data)
 983 {
 984         const char *refname = strip_namespace(refname_full);
 985
 986         mark_our_ref(refname, refname_full, oid);
 987         return 0;
 988 }
 989
 990 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 991 {
 992         struct string_list_item *item;
 993
 994         if (!symref->nr)
 995                 return;
 996         for_each_string_list_item(item, symref)
 997                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 998 }
 999
1000 static int send_ref(const char *refname, const struct object_id *oid,
1001                     int flag, void *cb_data)
1002 {
1003         static const char *capabilities = "multi_ack thin-pack side-band"
1004                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1005                 " deepen-relative no-progress include-tag multi_ack_detailed";
1006         const char *refname_nons = strip_namespace(refname);
1007         struct object_id peeled;
1008
1009         if (mark_our_ref(refname_nons, refname, oid))
1010                 return 0;
1011
1012         if (capabilities) {
1013                 struct strbuf symref_info = STRBUF_INIT;
1014
1015                 format_symref_info(&symref_info, cb_data);
1016                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1017                              oid_to_hex(oid), refname_nons,
1018                              0, capabilities,
1019                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1020                                      " allow-tip-sha1-in-want" : "",
1021                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1022                                      " allow-reachable-sha1-in-want" : "",
1023                              stateless_rpc ? " no-done" : "",
1024                              symref_info.buf,
1025                              allow_filter ? " filter" : "",
1026                              git_user_agent_sanitized());
1027                 strbuf_release(&symref_info);
1028         } else {
1029                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1030         }
1031         capabilities = NULL;
1032         if (!peel_ref(refname, &peeled))
1033                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1034         return 0;
1035 }
1036
1037 static int find_symref(const char *refname, const struct object_id *oid,
1038                        int flag, void *cb_data)
1039 {
1040         const char *symref_target;
1041         struct string_list_item *item;
1042
1043         if ((flag & REF_ISSYMREF) == 0)
1044                 return 0;
1045         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1046         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1047                 die("'%s' is a symref but it is not?", refname);
1048         item = string_list_append(cb_data, refname);
1049         item->util = xstrdup(symref_target);
1050         return 0;
1051 }
1052
1053 static int upload_pack_config(const char *var, const char *value, void *unused)
1054 {
1055         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1056                 if (git_config_bool(var, value))
1057                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1058                 else
1059                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1060         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1061                 if (git_config_bool(var, value))
1062                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1063                 else
1064                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1065         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1066                 if (git_config_bool(var, value))
1067                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1068                 else
1069                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1070         } else if (!strcmp("uploadpack.keepalive", var)) {
1071                 keepalive = git_config_int(var, value);
1072                 if (!keepalive)
1073                         keepalive = -1;
1074         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1075                 if (!strcmp("uploadpack.packobjectshook", var))
1076                         return git_config_string(&pack_objects_hook, var, value);
1077         } else if (!strcmp("uploadpack.allowfilter", var)) {
1078                 allow_filter = git_config_bool(var, value);
1079         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1080                 allow_ref_in_want = git_config_bool(var, value);
1081         }
1082         return parse_hide_refs_config(var, value, "uploadpack");
1083 }
1084
1085 void upload_pack(struct upload_pack_options *options)
1086 {
1087         struct string_list symref = STRING_LIST_INIT_DUP;
1088
1089         stateless_rpc = options->stateless_rpc;
1090         timeout = options->timeout;
1091         daemon_mode = options->daemon_mode;
1092
1093         git_config(upload_pack_config, NULL);
1094
1095         head_ref_namespaced(find_symref, &symref);
1096
1097         if (options->advertise_refs || !stateless_rpc) {
1098                 reset_timeout();
1099                 head_ref_namespaced(send_ref, &symref);
1100                 for_each_namespaced_ref(send_ref, &symref);
1101                 advertise_shallow_grafts(1);
1102                 packet_flush(1);
1103         } else {
1104                 head_ref_namespaced(check_ref, NULL);
1105                 for_each_namespaced_ref(check_ref, NULL);
1106         }
1107         string_list_clear(&symref, 1);
1108         if (options->advertise_refs)
1109                 return;
1110
1111         receive_needs();
1112         if (want_obj.nr) {
1113                 get_common_commits();
1114                 create_pack_file();
1115         }
1116 }
1117
1118 struct upload_pack_data {
1119         struct object_array wants;
1120         struct string_list wanted_refs;
1121         struct oid_array haves;
1122
1123         struct object_array shallows;
1124         struct string_list deepen_not;
1125         int depth;
1126         timestamp_t deepen_since;
1127         int deepen_rev_list;
1128         int deepen_relative;
1129
1130         unsigned stateless_rpc : 1;
1131
1132         unsigned use_thin_pack : 1;
1133         unsigned use_ofs_delta : 1;
1134         unsigned no_progress : 1;
1135         unsigned use_include_tag : 1;
1136         unsigned done : 1;
1137 };
1138
1139 static void upload_pack_data_init(struct upload_pack_data *data)
1140 {
1141         struct object_array wants = OBJECT_ARRAY_INIT;
1142         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1143         struct oid_array haves = OID_ARRAY_INIT;
1144         struct object_array shallows = OBJECT_ARRAY_INIT;
1145         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1146
1147         memset(data, 0, sizeof(*data));
1148         data->wants = wants;
1149         data->wanted_refs = wanted_refs;
1150         data->haves = haves;
1151         data->shallows = shallows;
1152         data->deepen_not = deepen_not;
1153 }
1154
1155 static void upload_pack_data_clear(struct upload_pack_data *data)
1156 {
1157         object_array_clear(&data->wants);
1158         string_list_clear(&data->wanted_refs, 1);
1159         oid_array_clear(&data->haves);
1160         object_array_clear(&data->shallows);
1161         string_list_clear(&data->deepen_not, 0);
1162 }
1163
1164 static int parse_want(const char *line)
1165 {
1166         const char *arg;
1167         if (skip_prefix(line, "want ", &arg)) {
1168                 struct object_id oid;
1169                 struct object *o;
1170
1171                 if (get_oid_hex(arg, &oid))
1172                         die("git upload-pack: protocol error, "
1173                             "expected to get oid, not '%s'", line);
1174
1175                 o = parse_object(&oid);
1176                 if (!o) {
1177                         packet_write_fmt(1,
1178                                          "ERR upload-pack: not our ref %s",
1179                                          oid_to_hex(&oid));
1180                         die("git upload-pack: not our ref %s",
1181                             oid_to_hex(&oid));
1182                 }
1183
1184                 if (!(o->flags & WANTED)) {
1185                         o->flags |= WANTED;
1186                         add_object_array(o, NULL, &want_obj);
1187                 }
1188
1189                 return 1;
1190         }
1191
1192         return 0;
1193 }
1194
1195 static int parse_want_ref(const char *line, struct string_list *wanted_refs)
1196 {
1197         const char *arg;
1198         if (skip_prefix(line, "want-ref ", &arg)) {
1199                 struct object_id oid;
1200                 struct string_list_item *item;
1201                 struct object *o;
1202
1203                 if (read_ref(arg, &oid)) {
1204                         packet_write_fmt(1, "ERR unknown ref %s", arg);
1205                         die("unknown ref %s", arg);
1206                 }
1207
1208                 item = string_list_append(wanted_refs, arg);
1209                 item->util = oiddup(&oid);
1210
1211                 o = parse_object_or_die(&oid, arg);
1212                 if (!(o->flags & WANTED)) {
1213                         o->flags |= WANTED;
1214                         add_object_array(o, NULL, &want_obj);
1215                 }
1216
1217                 return 1;
1218         }
1219
1220         return 0;
1221 }
1222
1223 static int parse_have(const char *line, struct oid_array *haves)
1224 {
1225         const char *arg;
1226         if (skip_prefix(line, "have ", &arg)) {
1227                 struct object_id oid;
1228
1229                 if (get_oid_hex(arg, &oid))
1230                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1231                 oid_array_append(haves, &oid);
1232                 return 1;
1233         }
1234
1235         return 0;
1236 }
1237
1238 static void process_args(struct packet_reader *request,
1239                          struct upload_pack_data *data)
1240 {
1241         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1242                 const char *arg = request->line;
1243                 const char *p;
1244
1245                 /* process want */
1246                 if (parse_want(arg))
1247                         continue;
1248                 if (allow_ref_in_want && parse_want_ref(arg, &data->wanted_refs))
1249                         continue;
1250                 /* process have line */
1251                 if (parse_have(arg, &data->haves))
1252                         continue;
1253
1254                 /* process args like thin-pack */
1255                 if (!strcmp(arg, "thin-pack")) {
1256                         use_thin_pack = 1;
1257                         continue;
1258                 }
1259                 if (!strcmp(arg, "ofs-delta")) {
1260                         use_ofs_delta = 1;
1261                         continue;
1262                 }
1263                 if (!strcmp(arg, "no-progress")) {
1264                         no_progress = 1;
1265                         continue;
1266                 }
1267                 if (!strcmp(arg, "include-tag")) {
1268                         use_include_tag = 1;
1269                         continue;
1270                 }
1271                 if (!strcmp(arg, "done")) {
1272                         data->done = 1;
1273                         continue;
1274                 }
1275
1276                 /* Shallow related arguments */
1277                 if (process_shallow(arg, &data->shallows))
1278                         continue;
1279                 if (process_deepen(arg, &data->depth))
1280                         continue;
1281                 if (process_deepen_since(arg, &data->deepen_since,
1282                                          &data->deepen_rev_list))
1283                         continue;
1284                 if (process_deepen_not(arg, &data->deepen_not,
1285                                        &data->deepen_rev_list))
1286                         continue;
1287                 if (!strcmp(arg, "deepen-relative")) {
1288                         data->deepen_relative = 1;
1289                         continue;
1290                 }
1291
1292                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1293                         parse_list_objects_filter(&filter_options, p);
1294                         continue;
1295                 }
1296
1297                 /* ignore unknown lines maybe? */
1298                 die("unexpected line: '%s'", arg);
1299         }
1300 }
1301
1302 static int process_haves(struct oid_array *haves, struct oid_array *common)
1303 {
1304         int i;
1305
1306         /* Process haves */
1307         for (i = 0; i < haves->nr; i++) {
1308                 const struct object_id *oid = &haves->oid[i];
1309                 struct object *o;
1310                 int we_knew_they_have = 0;
1311
1312                 if (!has_object_file(oid))
1313                         continue;
1314
1315                 oid_array_append(common, oid);
1316
1317                 o = parse_object(oid);
1318                 if (!o)
1319                         die("oops (%s)", oid_to_hex(oid));
1320                 if (o->type == OBJ_COMMIT) {
1321                         struct commit_list *parents;
1322                         struct commit *commit = (struct commit *)o;
1323                         if (o->flags & THEY_HAVE)
1324                                 we_knew_they_have = 1;
1325                         else
1326                                 o->flags |= THEY_HAVE;
1327                         if (!oldest_have || (commit->date < oldest_have))
1328                                 oldest_have = commit->date;
1329                         for (parents = commit->parents;
1330                              parents;
1331                              parents = parents->next)
1332                                 parents->item->object.flags |= THEY_HAVE;
1333                 }
1334                 if (!we_knew_they_have)
1335                         add_object_array(o, NULL, &have_obj);
1336         }
1337
1338         return 0;
1339 }
1340
1341 static int send_acks(struct oid_array *acks, struct strbuf *response)
1342 {
1343         int i;
1344
1345         packet_buf_write(response, "acknowledgments\n");
1346
1347         /* Send Acks */
1348         if (!acks->nr)
1349                 packet_buf_write(response, "NAK\n");
1350
1351         for (i = 0; i < acks->nr; i++) {
1352                 packet_buf_write(response, "ACK %s\n",
1353                                  oid_to_hex(&acks->oid[i]));
1354         }
1355
1356         if (ok_to_give_up()) {
1357                 /* Send Ready */
1358                 packet_buf_write(response, "ready\n");
1359                 return 1;
1360         }
1361
1362         return 0;
1363 }
1364
1365 static int process_haves_and_send_acks(struct upload_pack_data *data)
1366 {
1367         struct oid_array common = OID_ARRAY_INIT;
1368         struct strbuf response = STRBUF_INIT;
1369         int ret = 0;
1370
1371         process_haves(&data->haves, &common);
1372         if (data->done) {
1373                 ret = 1;
1374         } else if (send_acks(&common, &response)) {
1375                 packet_buf_delim(&response);
1376                 ret = 1;
1377         } else {
1378                 /* Add Flush */
1379                 packet_buf_flush(&response);
1380                 ret = 0;
1381         }
1382
1383         /* Send response */
1384         write_or_die(1, response.buf, response.len);
1385         strbuf_release(&response);
1386
1387         oid_array_clear(&data->haves);
1388         oid_array_clear(&common);
1389         return ret;
1390 }
1391
1392 static void send_wanted_ref_info(struct upload_pack_data *data)
1393 {
1394         const struct string_list_item *item;
1395
1396         if (!data->wanted_refs.nr)
1397                 return;
1398
1399         packet_write_fmt(1, "wanted-refs\n");
1400
1401         for_each_string_list_item(item, &data->wanted_refs) {
1402                 packet_write_fmt(1, "%s %s\n",
1403                                  oid_to_hex(item->util),
1404                                  item->string);
1405         }
1406
1407         packet_delim(1);
1408 }
1409
1410 static void send_shallow_info(struct upload_pack_data *data)
1411 {
1412         /* No shallow info needs to be sent */
1413         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1414             !is_repository_shallow())
1415                 return;
1416
1417         packet_write_fmt(1, "shallow-info\n");
1418
1419         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1420                                data->deepen_since, &data->deepen_not,
1421                                &data->shallows) && is_repository_shallow())
1422                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
1423
1424         packet_delim(1);
1425 }
1426
1427 enum fetch_state {
1428         FETCH_PROCESS_ARGS = 0,
1429         FETCH_SEND_ACKS,
1430         FETCH_SEND_PACK,
1431         FETCH_DONE,
1432 };
1433
1434 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1435                    struct packet_reader *request)
1436 {
1437         enum fetch_state state = FETCH_PROCESS_ARGS;
1438         struct upload_pack_data data;
1439
1440         git_config(upload_pack_config, NULL);
1441
1442         upload_pack_data_init(&data);
1443         use_sideband = LARGE_PACKET_MAX;
1444
1445         while (state != FETCH_DONE) {
1446                 switch (state) {
1447                 case FETCH_PROCESS_ARGS:
1448                         process_args(request, &data);
1449
1450                         if (!want_obj.nr) {
1451                                 /*
1452                                  * Request didn't contain any 'want' lines,
1453                                  * guess they didn't want anything.
1454                                  */
1455                                 state = FETCH_DONE;
1456                         } else if (data.haves.nr) {
1457                                 /*
1458                                  * Request had 'have' lines, so lets ACK them.
1459                                  */
1460                                 state = FETCH_SEND_ACKS;
1461                         } else {
1462                                 /*
1463                                  * Request had 'want's but no 'have's so we can
1464                                  * immedietly go to construct and send a pack.
1465                                  */
1466                                 state = FETCH_SEND_PACK;
1467                         }
1468                         break;
1469                 case FETCH_SEND_ACKS:
1470                         if (process_haves_and_send_acks(&data))
1471                                 state = FETCH_SEND_PACK;
1472                         else
1473                                 state = FETCH_DONE;
1474                         break;
1475                 case FETCH_SEND_PACK:
1476                         send_wanted_ref_info(&data);
1477                         send_shallow_info(&data);
1478
1479                         packet_write_fmt(1, "packfile\n");
1480                         create_pack_file();
1481                         state = FETCH_DONE;
1482                         break;
1483                 case FETCH_DONE:
1484                         continue;
1485                 }
1486         }
1487
1488         upload_pack_data_clear(&data);
1489         return 0;
1490 }
1491
1492 int upload_pack_advertise(struct repository *r,
1493                           struct strbuf *value)
1494 {
1495         if (value) {
1496                 int allow_filter_value;
1497                 int allow_ref_in_want;
1498
1499                 strbuf_addstr(value, "shallow");
1500
1501                 if (!repo_config_get_bool(the_repository,
1502                                          "uploadpack.allowfilter",
1503                                          &allow_filter_value) &&
1504                     allow_filter_value)
1505                         strbuf_addstr(value, " filter");
1506
1507                 if (!repo_config_get_bool(the_repository,
1508                                          "uploadpack.allowrefinwant",
1509                                          &allow_ref_in_want) &&
1510                     allow_ref_in_want)
1511                         strbuf_addstr(value, " ref-in-want");
1512         }
1513
1514         return 1;
1515 }