upload-pack.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "repository.h"
   7 #include "object-store.h"
   8 #include "tag.h"
   9 #include "object.h"
  10 #include "commit.h"
  11 #include "diff.h"
  12 #include "revision.h"
  13 #include "list-objects.h"
  14 #include "list-objects-filter.h"
  15 #include "list-objects-filter-options.h"
  16 #include "run-command.h"
  17 #include "connect.h"
  18 #include "sigchain.h"
  19 #include "version.h"
  20 #include "string-list.h"
  21 #include "argv-array.h"
  22 #include "prio-queue.h"
  23 #include "protocol.h"
  24 #include "quote.h"
  25 #include "upload-pack.h"
  26 #include "serve.h"
  27 #include "commit-graph.h"
  28 #include "commit-reach.h"
  29
  30 /* Remember to update object flag allocation in object.h */
  31 #define THEY_HAVE       (1u << 11)
  32 #define OUR_REF         (1u << 12)
  33 #define WANTED          (1u << 13)
  34 #define COMMON_KNOWN    (1u << 14)
  35
  36 #define SHALLOW         (1u << 16)
  37 #define NOT_SHALLOW     (1u << 17)
  38 #define CLIENT_SHALLOW  (1u << 18)
  39 #define HIDDEN_REF      (1u << 19)
  40
  41 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
  42                 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
  43
  44 static timestamp_t oldest_have;
  45
  46 static int multi_ack;
  47 static int no_done;
  48 static int use_thin_pack, use_ofs_delta, use_include_tag;
  49 static int no_progress, daemon_mode;
  50 /* Allow specifying sha1 if it is a ref tip. */
  51 #define ALLOW_TIP_SHA1  01
  52 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  53 #define ALLOW_REACHABLE_SHA1    02
  54 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  55 #define ALLOW_ANY_SHA1  07
  56 static unsigned int allow_unadvertised_object_request;
  57 static int shallow_nr;
  58 static struct object_array extra_edge_obj;
  59 static unsigned int timeout;
  60 static int keepalive = 5;
  61 /* 0 for no sideband,
  62  * otherwise maximum packet size (up to 65520 bytes).
  63  */
  64 static int use_sideband;
  65 static int stateless_rpc;
  66 static const char *pack_objects_hook;
  67
  68 static int filter_capability_requested;
  69 static int allow_filter;
  70 static int allow_ref_in_want;
  71 static struct list_objects_filter_options filter_options;
  72
  73 static int allow_sideband_all;
  74
  75 static void reset_timeout(void)
  76 {
  77         alarm(timeout);
  78 }
  79
  80 static void send_client_data(int fd, const char *data, ssize_t sz)
  81 {
  82         if (use_sideband) {
  83                 send_sideband(1, fd, data, sz, use_sideband);
  84                 return;
  85         }
  86         if (fd == 3)
  87                 /* emergency quit */
  88                 fd = 2;
  89         if (fd == 2) {
  90                 /* XXX: are we happy to lose stuff here? */
  91                 xwrite(fd, data, sz);
  92                 return;
  93         }
  94         write_or_die(fd, data, sz);
  95 }
  96
  97 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  98 {
  99         FILE *fp = cb_data;
 100         if (graft->nr_parent == -1)
 101                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 102         return 0;
 103 }
 104
 105 static void create_pack_file(const struct object_array *have_obj,
 106                              const struct object_array *want_obj)
 107 {
 108         struct child_process pack_objects = CHILD_PROCESS_INIT;
 109         char data[8193], progress[128];
 110         char abort_msg[] = "aborting due to possible repository "
 111                 "corruption on the remote side.";
 112         int buffered = -1;
 113         ssize_t sz;
 114         int i;
 115         FILE *pipe_fd;
 116
 117         if (!pack_objects_hook)
 118                 pack_objects.git_cmd = 1;
 119         else {
 120                 argv_array_push(&pack_objects.args, pack_objects_hook);
 121                 argv_array_push(&pack_objects.args, "git");
 122                 pack_objects.use_shell = 1;
 123         }
 124
 125         if (shallow_nr) {
 126                 argv_array_push(&pack_objects.args, "--shallow-file");
 127                 argv_array_push(&pack_objects.args, "");
 128         }
 129         argv_array_push(&pack_objects.args, "pack-objects");
 130         argv_array_push(&pack_objects.args, "--revs");
 131         if (use_thin_pack)
 132                 argv_array_push(&pack_objects.args, "--thin");
 133
 134         argv_array_push(&pack_objects.args, "--stdout");
 135         if (shallow_nr)
 136                 argv_array_push(&pack_objects.args, "--shallow");
 137         if (!no_progress)
 138                 argv_array_push(&pack_objects.args, "--progress");
 139         if (use_ofs_delta)
 140                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 141         if (use_include_tag)
 142                 argv_array_push(&pack_objects.args, "--include-tag");
 143         if (filter_options.filter_spec) {
 144                 struct strbuf expanded_filter_spec = STRBUF_INIT;
 145                 expand_list_objects_filter_spec(&filter_options,
 146                                                 &expanded_filter_spec);
 147                 if (pack_objects.use_shell) {
 148                         struct strbuf buf = STRBUF_INIT;
 149                         sq_quote_buf(&buf, expanded_filter_spec.buf);
 150                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 151                         strbuf_release(&buf);
 152                 } else {
 153                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 154                                          expanded_filter_spec.buf);
 155                 }
 156         }
 157
 158         pack_objects.in = -1;
 159         pack_objects.out = -1;
 160         pack_objects.err = -1;
 161
 162         if (start_command(&pack_objects))
 163                 die("git upload-pack: unable to fork git-pack-objects");
 164
 165         pipe_fd = xfdopen(pack_objects.in, "w");
 166
 167         if (shallow_nr)
 168                 for_each_commit_graft(write_one_shallow, pipe_fd);
 169
 170         for (i = 0; i < want_obj->nr; i++)
 171                 fprintf(pipe_fd, "%s\n",
 172                         oid_to_hex(&want_obj->objects[i].item->oid));
 173         fprintf(pipe_fd, "--not\n");
 174         for (i = 0; i < have_obj->nr; i++)
 175                 fprintf(pipe_fd, "%s\n",
 176                         oid_to_hex(&have_obj->objects[i].item->oid));
 177         for (i = 0; i < extra_edge_obj.nr; i++)
 178                 fprintf(pipe_fd, "%s\n",
 179                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 180         fprintf(pipe_fd, "\n");
 181         fflush(pipe_fd);
 182         fclose(pipe_fd);
 183
 184         /* We read from pack_objects.err to capture stderr output for
 185          * progress bar, and pack_objects.out to capture the pack data.
 186          */
 187
 188         while (1) {
 189                 struct pollfd pfd[2];
 190                 int pe, pu, pollsize;
 191                 int ret;
 192
 193                 reset_timeout();
 194
 195                 pollsize = 0;
 196                 pe = pu = -1;
 197
 198                 if (0 <= pack_objects.out) {
 199                         pfd[pollsize].fd = pack_objects.out;
 200                         pfd[pollsize].events = POLLIN;
 201                         pu = pollsize;
 202                         pollsize++;
 203                 }
 204                 if (0 <= pack_objects.err) {
 205                         pfd[pollsize].fd = pack_objects.err;
 206                         pfd[pollsize].events = POLLIN;
 207                         pe = pollsize;
 208                         pollsize++;
 209                 }
 210
 211                 if (!pollsize)
 212                         break;
 213
 214                 ret = poll(pfd, pollsize,
 215                         keepalive < 0 ? -1 : 1000 * keepalive);
 216
 217                 if (ret < 0) {
 218                         if (errno != EINTR) {
 219                                 error_errno("poll failed, resuming");
 220                                 sleep(1);
 221                         }
 222                         continue;
 223                 }
 224                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 225                         /* Status ready; we ship that in the side-band
 226                          * or dump to the standard error.
 227                          */
 228                         sz = xread(pack_objects.err, progress,
 229                                   sizeof(progress));
 230                         if (0 < sz)
 231                                 send_client_data(2, progress, sz);
 232                         else if (sz == 0) {
 233                                 close(pack_objects.err);
 234                                 pack_objects.err = -1;
 235                         }
 236                         else
 237                                 goto fail;
 238                         /* give priority to status messages */
 239                         continue;
 240                 }
 241                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 242                         /* Data ready; we keep the last byte to ourselves
 243                          * in case we detect broken rev-list, so that we
 244                          * can leave the stream corrupted.  This is
 245                          * unfortunate -- unpack-objects would happily
 246                          * accept a valid packdata with trailing garbage,
 247                          * so appending garbage after we pass all the
 248                          * pack data is not good enough to signal
 249                          * breakage to downstream.
 250                          */
 251                         char *cp = data;
 252                         ssize_t outsz = 0;
 253                         if (0 <= buffered) {
 254                                 *cp++ = buffered;
 255                                 outsz++;
 256                         }
 257                         sz = xread(pack_objects.out, cp,
 258                                   sizeof(data) - outsz);
 259                         if (0 < sz)
 260                                 ;
 261                         else if (sz == 0) {
 262                                 close(pack_objects.out);
 263                                 pack_objects.out = -1;
 264                         }
 265                         else
 266                                 goto fail;
 267                         sz += outsz;
 268                         if (1 < sz) {
 269                                 buffered = data[sz-1] & 0xFF;
 270                                 sz--;
 271                         }
 272                         else
 273                                 buffered = -1;
 274                         send_client_data(1, data, sz);
 275                 }
 276
 277                 /*
 278                  * We hit the keepalive timeout without saying anything; send
 279                  * an empty message on the data sideband just to let the other
 280                  * side know we're still working on it, but don't have any data
 281                  * yet.
 282                  *
 283                  * If we don't have a sideband channel, there's no room in the
 284                  * protocol to say anything, so those clients are just out of
 285                  * luck.
 286                  */
 287                 if (!ret && use_sideband) {
 288                         static const char buf[] = "0005\1";
 289                         write_or_die(1, buf, 5);
 290                 }
 291         }
 292
 293         if (finish_command(&pack_objects)) {
 294                 error("git upload-pack: git-pack-objects died with error.");
 295                 goto fail;
 296         }
 297
 298         /* flush the data */
 299         if (0 <= buffered) {
 300                 data[0] = buffered;
 301                 send_client_data(1, data, 1);
 302                 fprintf(stderr, "flushed.\n");
 303         }
 304         if (use_sideband)
 305                 packet_flush(1);
 306         return;
 307
 308  fail:
 309         send_client_data(3, abort_msg, sizeof(abort_msg));
 310         die("git upload-pack: %s", abort_msg);
 311 }
 312
 313 static int got_oid(const char *hex, struct object_id *oid,
 314                    struct object_array *have_obj)
 315 {
 316         struct object *o;
 317         int we_knew_they_have = 0;
 318
 319         if (get_oid_hex(hex, oid))
 320                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 321         if (!has_object_file(oid))
 322                 return -1;
 323
 324         o = parse_object(the_repository, oid);
 325         if (!o)
 326                 die("oops (%s)", oid_to_hex(oid));
 327         if (o->type == OBJ_COMMIT) {
 328                 struct commit_list *parents;
 329                 struct commit *commit = (struct commit *)o;
 330                 if (o->flags & THEY_HAVE)
 331                         we_knew_they_have = 1;
 332                 else
 333                         o->flags |= THEY_HAVE;
 334                 if (!oldest_have || (commit->date < oldest_have))
 335                         oldest_have = commit->date;
 336                 for (parents = commit->parents;
 337                      parents;
 338                      parents = parents->next)
 339                         parents->item->object.flags |= THEY_HAVE;
 340         }
 341         if (!we_knew_they_have) {
 342                 add_object_array(o, NULL, have_obj);
 343                 return 1;
 344         }
 345         return 0;
 346 }
 347
 348 static int ok_to_give_up(const struct object_array *have_obj,
 349                          struct object_array *want_obj)
 350 {
 351         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 352
 353         if (!have_obj->nr)
 354                 return 0;
 355
 356         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 357                                             COMMON_KNOWN, oldest_have,
 358                                             min_generation);
 359 }
 360
 361 static int get_common_commits(struct packet_reader *reader,
 362                               struct object_array *have_obj,
 363                               struct object_array *want_obj)
 364 {
 365         struct object_id oid;
 366         char last_hex[GIT_MAX_HEXSZ + 1];
 367         int got_common = 0;
 368         int got_other = 0;
 369         int sent_ready = 0;
 370
 371         save_commit_buffer = 0;
 372
 373         for (;;) {
 374                 const char *arg;
 375
 376                 reset_timeout();
 377
 378                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 379                         if (multi_ack == 2 && got_common
 380                             && !got_other && ok_to_give_up(have_obj, want_obj)) {
 381                                 sent_ready = 1;
 382                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 383                         }
 384                         if (have_obj->nr == 0 || multi_ack)
 385                                 packet_write_fmt(1, "NAK\n");
 386
 387                         if (no_done && sent_ready) {
 388                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 389                                 return 0;
 390                         }
 391                         if (stateless_rpc)
 392                                 exit(0);
 393                         got_common = 0;
 394                         got_other = 0;
 395                         continue;
 396                 }
 397                 if (skip_prefix(reader->line, "have ", &arg)) {
 398                         switch (got_oid(arg, &oid, have_obj)) {
 399                         case -1: /* they have what we do not */
 400                                 got_other = 1;
 401                                 if (multi_ack && ok_to_give_up(have_obj, want_obj)) {
 402                                         const char *hex = oid_to_hex(&oid);
 403                                         if (multi_ack == 2) {
 404                                                 sent_ready = 1;
 405                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 406                                         } else
 407                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 408                                 }
 409                                 break;
 410                         default:
 411                                 got_common = 1;
 412                                 oid_to_hex_r(last_hex, &oid);
 413                                 if (multi_ack == 2)
 414                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 415                                 else if (multi_ack)
 416                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 417                                 else if (have_obj->nr == 1)
 418                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 419                                 break;
 420                         }
 421                         continue;
 422                 }
 423                 if (!strcmp(reader->line, "done")) {
 424                         if (have_obj->nr > 0) {
 425                                 if (multi_ack)
 426                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 427                                 return 0;
 428                         }
 429                         packet_write_fmt(1, "NAK\n");
 430                         return -1;
 431                 }
 432                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 433         }
 434 }
 435
 436 static int is_our_ref(struct object *o)
 437 {
 438         int allow_hidden_ref = (allow_unadvertised_object_request &
 439                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 440         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 441 }
 442
 443 /*
 444  * on successful case, it's up to the caller to close cmd->out
 445  */
 446 static int do_reachable_revlist(struct child_process *cmd,
 447                                 struct object_array *src,
 448                                 struct object_array *reachable)
 449 {
 450         static const char *argv[] = {
 451                 "rev-list", "--stdin", NULL,
 452         };
 453         struct object *o;
 454         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 455         int i;
 456         const unsigned hexsz = the_hash_algo->hexsz;
 457
 458         cmd->argv = argv;
 459         cmd->git_cmd = 1;
 460         cmd->no_stderr = 1;
 461         cmd->in = -1;
 462         cmd->out = -1;
 463
 464         /*
 465          * If the next rev-list --stdin encounters an unknown commit,
 466          * it terminates, which will cause SIGPIPE in the write loop
 467          * below.
 468          */
 469         sigchain_push(SIGPIPE, SIG_IGN);
 470
 471         if (start_command(cmd))
 472                 goto error;
 473
 474         namebuf[0] = '^';
 475         namebuf[hexsz + 1] = '\n';
 476         for (i = get_max_object_index(); 0 < i; ) {
 477                 o = get_indexed_object(--i);
 478                 if (!o)
 479                         continue;
 480                 if (reachable && o->type == OBJ_COMMIT)
 481                         o->flags &= ~TMP_MARK;
 482                 if (!is_our_ref(o))
 483                         continue;
 484                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 485                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 486                         goto error;
 487         }
 488         namebuf[hexsz] = '\n';
 489         for (i = 0; i < src->nr; i++) {
 490                 o = src->objects[i].item;
 491                 if (is_our_ref(o)) {
 492                         if (reachable)
 493                                 add_object_array(o, NULL, reachable);
 494                         continue;
 495                 }
 496                 if (reachable && o->type == OBJ_COMMIT)
 497                         o->flags |= TMP_MARK;
 498                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 499                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 500                         goto error;
 501         }
 502         close(cmd->in);
 503         cmd->in = -1;
 504         sigchain_pop(SIGPIPE);
 505
 506         return 0;
 507
 508 error:
 509         sigchain_pop(SIGPIPE);
 510
 511         if (cmd->in >= 0)
 512                 close(cmd->in);
 513         if (cmd->out >= 0)
 514                 close(cmd->out);
 515         return -1;
 516 }
 517
 518 static int get_reachable_list(struct object_array *src,
 519                               struct object_array *reachable)
 520 {
 521         struct child_process cmd = CHILD_PROCESS_INIT;
 522         int i;
 523         struct object *o;
 524         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 525         const unsigned hexsz = the_hash_algo->hexsz;
 526
 527         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 528                 return -1;
 529
 530         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 531                 struct object_id oid;
 532                 const char *p;
 533
 534                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 535                         break;
 536
 537                 o = lookup_object(the_repository, &oid);
 538                 if (o && o->type == OBJ_COMMIT) {
 539                         o->flags &= ~TMP_MARK;
 540                 }
 541         }
 542         for (i = get_max_object_index(); 0 < i; i--) {
 543                 o = get_indexed_object(i - 1);
 544                 if (o && o->type == OBJ_COMMIT &&
 545                     (o->flags & TMP_MARK)) {
 546                         add_object_array(o, NULL, reachable);
 547                                 o->flags &= ~TMP_MARK;
 548                 }
 549         }
 550         close(cmd.out);
 551
 552         if (finish_command(&cmd))
 553                 return -1;
 554
 555         return 0;
 556 }
 557
 558 static int has_unreachable(struct object_array *src)
 559 {
 560         struct child_process cmd = CHILD_PROCESS_INIT;
 561         char buf[1];
 562         int i;
 563
 564         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 565                 return 1;
 566
 567         /*
 568          * The commits out of the rev-list are not ancestors of
 569          * our ref.
 570          */
 571         i = read_in_full(cmd.out, buf, 1);
 572         if (i)
 573                 goto error;
 574         close(cmd.out);
 575         cmd.out = -1;
 576
 577         /*
 578          * rev-list may have died by encountering a bad commit
 579          * in the history, in which case we do want to bail out
 580          * even when it showed no commit.
 581          */
 582         if (finish_command(&cmd))
 583                 goto error;
 584
 585         /* All the non-tip ones are ancestors of what we advertised */
 586         return 0;
 587
 588 error:
 589         sigchain_pop(SIGPIPE);
 590         if (cmd.out >= 0)
 591                 close(cmd.out);
 592         return 1;
 593 }
 594
 595 static void check_non_tip(struct object_array *want_obj,
 596                           struct packet_writer *writer)
 597 {
 598         int i;
 599
 600         /*
 601          * In the normal in-process case without
 602          * uploadpack.allowReachableSHA1InWant,
 603          * non-tip requests can never happen.
 604          */
 605         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 606                 goto error;
 607         if (!has_unreachable(want_obj))
 608                 /* All the non-tip ones are ancestors of what we advertised */
 609                 return;
 610
 611 error:
 612         /* Pick one of them (we know there at least is one) */
 613         for (i = 0; i < want_obj->nr; i++) {
 614                 struct object *o = want_obj->objects[i].item;
 615                 if (!is_our_ref(o)) {
 616                         packet_writer_error(writer,
 617                                             "upload-pack: not our ref %s",
 618                                             oid_to_hex(&o->oid));
 619                         die("git upload-pack: not our ref %s",
 620                             oid_to_hex(&o->oid));
 621                 }
 622         }
 623 }
 624
 625 static void send_shallow(struct packet_writer *writer,
 626                          struct commit_list *result)
 627 {
 628         while (result) {
 629                 struct object *object = &result->item->object;
 630                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 631                         packet_writer_write(writer, "shallow %s",
 632                                             oid_to_hex(&object->oid));
 633                         register_shallow(the_repository, &object->oid);
 634                         shallow_nr++;
 635                 }
 636                 result = result->next;
 637         }
 638 }
 639
 640 static void send_unshallow(struct packet_writer *writer,
 641                            const struct object_array *shallows,
 642                            struct object_array *want_obj)
 643 {
 644         int i;
 645
 646         for (i = 0; i < shallows->nr; i++) {
 647                 struct object *object = shallows->objects[i].item;
 648                 if (object->flags & NOT_SHALLOW) {
 649                         struct commit_list *parents;
 650                         packet_writer_write(writer, "unshallow %s",
 651                                             oid_to_hex(&object->oid));
 652                         object->flags &= ~CLIENT_SHALLOW;
 653                         /*
 654                          * We want to _register_ "object" as shallow, but we
 655                          * also need to traverse object's parents to deepen a
 656                          * shallow clone. Unregister it for now so we can
 657                          * parse and add the parents to the want list, then
 658                          * re-register it.
 659                          */
 660                         unregister_shallow(&object->oid);
 661                         object->parsed = 0;
 662                         parse_commit_or_die((struct commit *)object);
 663                         parents = ((struct commit *)object)->parents;
 664                         while (parents) {
 665                                 add_object_array(&parents->item->object,
 666                                                  NULL, want_obj);
 667                                 parents = parents->next;
 668                         }
 669                         add_object_array(object, NULL, &extra_edge_obj);
 670                 }
 671                 /* make sure commit traversal conforms to client */
 672                 register_shallow(the_repository, &object->oid);
 673         }
 674 }
 675
 676 static int check_ref(const char *refname_full, const struct object_id *oid,
 677                      int flag, void *cb_data);
 678 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
 679                    struct object_array *shallows, struct object_array *want_obj)
 680 {
 681         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 682                 int i;
 683
 684                 for (i = 0; i < shallows->nr; i++) {
 685                         struct object *object = shallows->objects[i].item;
 686                         object->flags |= NOT_SHALLOW;
 687                 }
 688         } else if (deepen_relative) {
 689                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 690                 struct commit_list *result;
 691
 692                 /*
 693                  * Checking for reachable shallows requires that our refs be
 694                  * marked with OUR_REF.
 695                  */
 696                 head_ref_namespaced(check_ref, NULL);
 697                 for_each_namespaced_ref(check_ref, NULL);
 698
 699                 get_reachable_list(shallows, &reachable_shallows);
 700                 result = get_shallow_commits(&reachable_shallows,
 701                                              depth + 1,
 702                                              SHALLOW, NOT_SHALLOW);
 703                 send_shallow(writer, result);
 704                 free_commit_list(result);
 705                 object_array_clear(&reachable_shallows);
 706         } else {
 707                 struct commit_list *result;
 708
 709                 result = get_shallow_commits(want_obj, depth,
 710                                              SHALLOW, NOT_SHALLOW);
 711                 send_shallow(writer, result);
 712                 free_commit_list(result);
 713         }
 714
 715         send_unshallow(writer, shallows, want_obj);
 716 }
 717
 718 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
 719                                const char **av,
 720                                struct object_array *shallows,
 721                                struct object_array *want_obj)
 722 {
 723         struct commit_list *result;
 724
 725         close_commit_graph(the_repository->objects);
 726         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 727         send_shallow(writer, result);
 728         free_commit_list(result);
 729         send_unshallow(writer, shallows, want_obj);
 730 }
 731
 732 /* Returns 1 if a shallow list is sent or 0 otherwise */
 733 static int send_shallow_list(struct packet_writer *writer,
 734                              int depth, int deepen_rev_list,
 735                              timestamp_t deepen_since,
 736                              struct string_list *deepen_not,
 737                              int deepen_relative,
 738                              struct object_array *shallows,
 739                              struct object_array *want_obj)
 740 {
 741         int ret = 0;
 742
 743         if (depth > 0 && deepen_rev_list)
 744                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 745         if (depth > 0) {
 746                 deepen(writer, depth, deepen_relative, shallows, want_obj);
 747                 ret = 1;
 748         } else if (deepen_rev_list) {
 749                 struct argv_array av = ARGV_ARRAY_INIT;
 750                 int i;
 751
 752                 argv_array_push(&av, "rev-list");
 753                 if (deepen_since)
 754                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 755                 if (deepen_not->nr) {
 756                         argv_array_push(&av, "--not");
 757                         for (i = 0; i < deepen_not->nr; i++) {
 758                                 struct string_list_item *s = deepen_not->items + i;
 759                                 argv_array_push(&av, s->string);
 760                         }
 761                         argv_array_push(&av, "--not");
 762                 }
 763                 for (i = 0; i < want_obj->nr; i++) {
 764                         struct object *o = want_obj->objects[i].item;
 765                         argv_array_push(&av, oid_to_hex(&o->oid));
 766                 }
 767                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
 768                 argv_array_clear(&av);
 769                 ret = 1;
 770         } else {
 771                 if (shallows->nr > 0) {
 772                         int i;
 773                         for (i = 0; i < shallows->nr; i++)
 774                                 register_shallow(the_repository,
 775                                                  &shallows->objects[i].item->oid);
 776                 }
 777         }
 778
 779         shallow_nr += shallows->nr;
 780         return ret;
 781 }
 782
 783 static int process_shallow(const char *line, struct object_array *shallows)
 784 {
 785         const char *arg;
 786         if (skip_prefix(line, "shallow ", &arg)) {
 787                 struct object_id oid;
 788                 struct object *object;
 789                 if (get_oid_hex(arg, &oid))
 790                         die("invalid shallow line: %s", line);
 791                 object = parse_object(the_repository, &oid);
 792                 if (!object)
 793                         return 1;
 794                 if (object->type != OBJ_COMMIT)
 795                         die("invalid shallow object %s", oid_to_hex(&oid));
 796                 if (!(object->flags & CLIENT_SHALLOW)) {
 797                         object->flags |= CLIENT_SHALLOW;
 798                         add_object_array(object, NULL, shallows);
 799                 }
 800                 return 1;
 801         }
 802
 803         return 0;
 804 }
 805
 806 static int process_deepen(const char *line, int *depth)
 807 {
 808         const char *arg;
 809         if (skip_prefix(line, "deepen ", &arg)) {
 810                 char *end = NULL;
 811                 *depth = (int)strtol(arg, &end, 0);
 812                 if (!end || *end || *depth <= 0)
 813                         die("Invalid deepen: %s", line);
 814                 return 1;
 815         }
 816
 817         return 0;
 818 }
 819
 820 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 821 {
 822         const char *arg;
 823         if (skip_prefix(line, "deepen-since ", &arg)) {
 824                 char *end = NULL;
 825                 *deepen_since = parse_timestamp(arg, &end, 0);
 826                 if (!end || *end || !deepen_since ||
 827                     /* revisions.c's max_age -1 is special */
 828                     *deepen_since == -1)
 829                         die("Invalid deepen-since: %s", line);
 830                 *deepen_rev_list = 1;
 831                 return 1;
 832         }
 833         return 0;
 834 }
 835
 836 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 837 {
 838         const char *arg;
 839         if (skip_prefix(line, "deepen-not ", &arg)) {
 840                 char *ref = NULL;
 841                 struct object_id oid;
 842                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 843                         die("git upload-pack: ambiguous deepen-not: %s", line);
 844                 string_list_append(deepen_not, ref);
 845                 free(ref);
 846                 *deepen_rev_list = 1;
 847                 return 1;
 848         }
 849         return 0;
 850 }
 851
 852 static void receive_needs(struct packet_reader *reader, struct object_array *want_obj)
 853 {
 854         struct object_array shallows = OBJECT_ARRAY_INIT;
 855         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 856         int depth = 0;
 857         int has_non_tip = 0;
 858         timestamp_t deepen_since = 0;
 859         int deepen_rev_list = 0;
 860         int deepen_relative = 0;
 861         struct packet_writer writer;
 862
 863         shallow_nr = 0;
 864         packet_writer_init(&writer, 1);
 865         for (;;) {
 866                 struct object *o;
 867                 const char *features;
 868                 struct object_id oid_buf;
 869                 const char *arg;
 870
 871                 reset_timeout();
 872                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 873                         break;
 874
 875                 if (process_shallow(reader->line, &shallows))
 876                         continue;
 877                 if (process_deepen(reader->line, &depth))
 878                         continue;
 879                 if (process_deepen_since(reader->line, &deepen_since, &deepen_rev_list))
 880                         continue;
 881                 if (process_deepen_not(reader->line, &deepen_not, &deepen_rev_list))
 882                         continue;
 883
 884                 if (skip_prefix(reader->line, "filter ", &arg)) {
 885                         if (!filter_capability_requested)
 886                                 die("git upload-pack: filtering capability not negotiated");
 887                         parse_list_objects_filter(&filter_options, arg);
 888                         continue;
 889                 }
 890
 891                 if (!skip_prefix(reader->line, "want ", &arg) ||
 892                     parse_oid_hex(arg, &oid_buf, &features))
 893                         die("git upload-pack: protocol error, "
 894                             "expected to get object ID, not '%s'", reader->line);
 895
 896                 if (parse_feature_request(features, "deepen-relative"))
 897                         deepen_relative = 1;
 898                 if (parse_feature_request(features, "multi_ack_detailed"))
 899                         multi_ack = 2;
 900                 else if (parse_feature_request(features, "multi_ack"))
 901                         multi_ack = 1;
 902                 if (parse_feature_request(features, "no-done"))
 903                         no_done = 1;
 904                 if (parse_feature_request(features, "thin-pack"))
 905                         use_thin_pack = 1;
 906                 if (parse_feature_request(features, "ofs-delta"))
 907                         use_ofs_delta = 1;
 908                 if (parse_feature_request(features, "side-band-64k"))
 909                         use_sideband = LARGE_PACKET_MAX;
 910                 else if (parse_feature_request(features, "side-band"))
 911                         use_sideband = DEFAULT_PACKET_MAX;
 912                 if (parse_feature_request(features, "no-progress"))
 913                         no_progress = 1;
 914                 if (parse_feature_request(features, "include-tag"))
 915                         use_include_tag = 1;
 916                 if (allow_filter && parse_feature_request(features, "filter"))
 917                         filter_capability_requested = 1;
 918
 919                 o = parse_object(the_repository, &oid_buf);
 920                 if (!o) {
 921                         packet_writer_error(&writer,
 922                                             "upload-pack: not our ref %s",
 923                                             oid_to_hex(&oid_buf));
 924                         die("git upload-pack: not our ref %s",
 925                             oid_to_hex(&oid_buf));
 926                 }
 927                 if (!(o->flags & WANTED)) {
 928                         o->flags |= WANTED;
 929                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 930                               || is_our_ref(o)))
 931                                 has_non_tip = 1;
 932                         add_object_array(o, NULL, want_obj);
 933                 }
 934         }
 935
 936         /*
 937          * We have sent all our refs already, and the other end
 938          * should have chosen out of them. When we are operating
 939          * in the stateless RPC mode, however, their choice may
 940          * have been based on the set of older refs advertised
 941          * by another process that handled the initial request.
 942          */
 943         if (has_non_tip)
 944                 check_non_tip(want_obj, &writer);
 945
 946         if (!use_sideband && daemon_mode)
 947                 no_progress = 1;
 948
 949         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 950                 return;
 951
 952         if (send_shallow_list(&writer, depth, deepen_rev_list, deepen_since,
 953                               &deepen_not, deepen_relative, &shallows,
 954                               want_obj))
 955                 packet_flush(1);
 956         object_array_clear(&shallows);
 957 }
 958
 959 /* return non-zero if the ref is hidden, otherwise 0 */
 960 static int mark_our_ref(const char *refname, const char *refname_full,
 961                         const struct object_id *oid)
 962 {
 963         struct object *o = lookup_unknown_object(oid);
 964
 965         if (ref_is_hidden(refname, refname_full)) {
 966                 o->flags |= HIDDEN_REF;
 967                 return 1;
 968         }
 969         o->flags |= OUR_REF;
 970         return 0;
 971 }
 972
 973 static int check_ref(const char *refname_full, const struct object_id *oid,
 974                      int flag, void *cb_data)
 975 {
 976         const char *refname = strip_namespace(refname_full);
 977
 978         mark_our_ref(refname, refname_full, oid);
 979         return 0;
 980 }
 981
 982 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 983 {
 984         struct string_list_item *item;
 985
 986         if (!symref->nr)
 987                 return;
 988         for_each_string_list_item(item, symref)
 989                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 990 }
 991
 992 static int send_ref(const char *refname, const struct object_id *oid,
 993                     int flag, void *cb_data)
 994 {
 995         static const char *capabilities = "multi_ack thin-pack side-band"
 996                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 997                 " deepen-relative no-progress include-tag multi_ack_detailed";
 998         const char *refname_nons = strip_namespace(refname);
 999         struct object_id peeled;
1000
1001         if (mark_our_ref(refname_nons, refname, oid))
1002                 return 0;
1003
1004         if (capabilities) {
1005                 struct strbuf symref_info = STRBUF_INIT;
1006
1007                 format_symref_info(&symref_info, cb_data);
1008                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1009                              oid_to_hex(oid), refname_nons,
1010                              0, capabilities,
1011                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1012                                      " allow-tip-sha1-in-want" : "",
1013                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1014                                      " allow-reachable-sha1-in-want" : "",
1015                              stateless_rpc ? " no-done" : "",
1016                              symref_info.buf,
1017                              allow_filter ? " filter" : "",
1018                              git_user_agent_sanitized());
1019                 strbuf_release(&symref_info);
1020         } else {
1021                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1022         }
1023         capabilities = NULL;
1024         if (!peel_ref(refname, &peeled))
1025                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1026         return 0;
1027 }
1028
1029 static int find_symref(const char *refname, const struct object_id *oid,
1030                        int flag, void *cb_data)
1031 {
1032         const char *symref_target;
1033         struct string_list_item *item;
1034
1035         if ((flag & REF_ISSYMREF) == 0)
1036                 return 0;
1037         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1038         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1039                 die("'%s' is a symref but it is not?", refname);
1040         item = string_list_append(cb_data, strip_namespace(refname));
1041         item->util = xstrdup(strip_namespace(symref_target));
1042         return 0;
1043 }
1044
1045 static int upload_pack_config(const char *var, const char *value, void *unused)
1046 {
1047         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1048                 if (git_config_bool(var, value))
1049                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1050                 else
1051                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1052         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1053                 if (git_config_bool(var, value))
1054                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1055                 else
1056                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1057         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1058                 if (git_config_bool(var, value))
1059                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1060                 else
1061                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1062         } else if (!strcmp("uploadpack.keepalive", var)) {
1063                 keepalive = git_config_int(var, value);
1064                 if (!keepalive)
1065                         keepalive = -1;
1066         } else if (!strcmp("uploadpack.allowfilter", var)) {
1067                 allow_filter = git_config_bool(var, value);
1068         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1069                 allow_ref_in_want = git_config_bool(var, value);
1070         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1071                 allow_sideband_all = git_config_bool(var, value);
1072         } else if (!strcmp("core.precomposeunicode", var)) {
1073                 precomposed_unicode = git_config_bool(var, value);
1074         }
1075
1076         if (current_config_scope() != CONFIG_SCOPE_REPO) {
1077                 if (!strcmp("uploadpack.packobjectshook", var))
1078                         return git_config_string(&pack_objects_hook, var, value);
1079         }
1080
1081         return parse_hide_refs_config(var, value, "uploadpack");
1082 }
1083
1084 void upload_pack(struct upload_pack_options *options)
1085 {
1086         struct string_list symref = STRING_LIST_INIT_DUP;
1087         struct object_array want_obj = OBJECT_ARRAY_INIT;
1088         struct packet_reader reader;
1089
1090         stateless_rpc = options->stateless_rpc;
1091         timeout = options->timeout;
1092         daemon_mode = options->daemon_mode;
1093
1094         git_config(upload_pack_config, NULL);
1095
1096         head_ref_namespaced(find_symref, &symref);
1097
1098         if (options->advertise_refs || !stateless_rpc) {
1099                 reset_timeout();
1100                 head_ref_namespaced(send_ref, &symref);
1101                 for_each_namespaced_ref(send_ref, &symref);
1102                 advertise_shallow_grafts(1);
1103                 packet_flush(1);
1104         } else {
1105                 head_ref_namespaced(check_ref, NULL);
1106                 for_each_namespaced_ref(check_ref, NULL);
1107         }
1108         string_list_clear(&symref, 1);
1109         if (options->advertise_refs)
1110                 return;
1111
1112         packet_reader_init(&reader, 0, NULL, 0,
1113                            PACKET_READ_CHOMP_NEWLINE |
1114                            PACKET_READ_DIE_ON_ERR_PACKET);
1115
1116         receive_needs(&reader, &want_obj);
1117         if (want_obj.nr) {
1118                 struct object_array have_obj = OBJECT_ARRAY_INIT;
1119                 get_common_commits(&reader, &have_obj, &want_obj);
1120                 create_pack_file(&have_obj, &want_obj);
1121         }
1122 }
1123
1124 struct upload_pack_data {
1125         struct object_array wants;
1126         struct string_list wanted_refs;
1127         struct oid_array haves;
1128
1129         struct object_array shallows;
1130         struct string_list deepen_not;
1131         int depth;
1132         timestamp_t deepen_since;
1133         int deepen_rev_list;
1134         int deepen_relative;
1135
1136         struct packet_writer writer;
1137
1138         unsigned stateless_rpc : 1;
1139
1140         unsigned use_thin_pack : 1;
1141         unsigned use_ofs_delta : 1;
1142         unsigned no_progress : 1;
1143         unsigned use_include_tag : 1;
1144         unsigned done : 1;
1145 };
1146
1147 static void upload_pack_data_init(struct upload_pack_data *data)
1148 {
1149         struct object_array wants = OBJECT_ARRAY_INIT;
1150         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1151         struct oid_array haves = OID_ARRAY_INIT;
1152         struct object_array shallows = OBJECT_ARRAY_INIT;
1153         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1154
1155         memset(data, 0, sizeof(*data));
1156         data->wants = wants;
1157         data->wanted_refs = wanted_refs;
1158         data->haves = haves;
1159         data->shallows = shallows;
1160         data->deepen_not = deepen_not;
1161         packet_writer_init(&data->writer, 1);
1162 }
1163
1164 static void upload_pack_data_clear(struct upload_pack_data *data)
1165 {
1166         object_array_clear(&data->wants);
1167         string_list_clear(&data->wanted_refs, 1);
1168         oid_array_clear(&data->haves);
1169         object_array_clear(&data->shallows);
1170         string_list_clear(&data->deepen_not, 0);
1171 }
1172
1173 static int parse_want(struct packet_writer *writer, const char *line,
1174                       struct object_array *want_obj)
1175 {
1176         const char *arg;
1177         if (skip_prefix(line, "want ", &arg)) {
1178                 struct object_id oid;
1179                 struct object *o;
1180
1181                 if (get_oid_hex(arg, &oid))
1182                         die("git upload-pack: protocol error, "
1183                             "expected to get oid, not '%s'", line);
1184
1185                 o = parse_object(the_repository, &oid);
1186                 if (!o) {
1187                         packet_writer_error(writer,
1188                                             "upload-pack: not our ref %s",
1189                                             oid_to_hex(&oid));
1190                         die("git upload-pack: not our ref %s",
1191                             oid_to_hex(&oid));
1192                 }
1193
1194                 if (!(o->flags & WANTED)) {
1195                         o->flags |= WANTED;
1196                         add_object_array(o, NULL, want_obj);
1197                 }
1198
1199                 return 1;
1200         }
1201
1202         return 0;
1203 }
1204
1205 static int parse_want_ref(struct packet_writer *writer, const char *line,
1206                           struct string_list *wanted_refs,
1207                           struct object_array *want_obj)
1208 {
1209         const char *arg;
1210         if (skip_prefix(line, "want-ref ", &arg)) {
1211                 struct object_id oid;
1212                 struct string_list_item *item;
1213                 struct object *o;
1214
1215                 if (read_ref(arg, &oid)) {
1216                         packet_writer_error(writer, "unknown ref %s", arg);
1217                         die("unknown ref %s", arg);
1218                 }
1219
1220                 item = string_list_append(wanted_refs, arg);
1221                 item->util = oiddup(&oid);
1222
1223                 o = parse_object_or_die(&oid, arg);
1224                 if (!(o->flags & WANTED)) {
1225                         o->flags |= WANTED;
1226                         add_object_array(o, NULL, want_obj);
1227                 }
1228
1229                 return 1;
1230         }
1231
1232         return 0;
1233 }
1234
1235 static int parse_have(const char *line, struct oid_array *haves)
1236 {
1237         const char *arg;
1238         if (skip_prefix(line, "have ", &arg)) {
1239                 struct object_id oid;
1240
1241                 if (get_oid_hex(arg, &oid))
1242                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1243                 oid_array_append(haves, &oid);
1244                 return 1;
1245         }
1246
1247         return 0;
1248 }
1249
1250 static void process_args(struct packet_reader *request,
1251                          struct upload_pack_data *data,
1252                          struct object_array *want_obj)
1253 {
1254         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1255                 const char *arg = request->line;
1256                 const char *p;
1257
1258                 /* process want */
1259                 if (parse_want(&data->writer, arg, want_obj))
1260                         continue;
1261                 if (allow_ref_in_want &&
1262                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1263                                    want_obj))
1264                         continue;
1265                 /* process have line */
1266                 if (parse_have(arg, &data->haves))
1267                         continue;
1268
1269                 /* process args like thin-pack */
1270                 if (!strcmp(arg, "thin-pack")) {
1271                         use_thin_pack = 1;
1272                         continue;
1273                 }
1274                 if (!strcmp(arg, "ofs-delta")) {
1275                         use_ofs_delta = 1;
1276                         continue;
1277                 }
1278                 if (!strcmp(arg, "no-progress")) {
1279                         no_progress = 1;
1280                         continue;
1281                 }
1282                 if (!strcmp(arg, "include-tag")) {
1283                         use_include_tag = 1;
1284                         continue;
1285                 }
1286                 if (!strcmp(arg, "done")) {
1287                         data->done = 1;
1288                         continue;
1289                 }
1290
1291                 /* Shallow related arguments */
1292                 if (process_shallow(arg, &data->shallows))
1293                         continue;
1294                 if (process_deepen(arg, &data->depth))
1295                         continue;
1296                 if (process_deepen_since(arg, &data->deepen_since,
1297                                          &data->deepen_rev_list))
1298                         continue;
1299                 if (process_deepen_not(arg, &data->deepen_not,
1300                                        &data->deepen_rev_list))
1301                         continue;
1302                 if (!strcmp(arg, "deepen-relative")) {
1303                         data->deepen_relative = 1;
1304                         continue;
1305                 }
1306
1307                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1308                         parse_list_objects_filter(&filter_options, p);
1309                         continue;
1310                 }
1311
1312                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1313                      allow_sideband_all) &&
1314                     !strcmp(arg, "sideband-all")) {
1315                         data->writer.use_sideband = 1;
1316                         continue;
1317                 }
1318
1319                 /* ignore unknown lines maybe? */
1320                 die("unexpected line: '%s'", arg);
1321         }
1322 }
1323
1324 static int process_haves(struct oid_array *haves, struct oid_array *common,
1325                          struct object_array *have_obj)
1326 {
1327         int i;
1328
1329         /* Process haves */
1330         for (i = 0; i < haves->nr; i++) {
1331                 const struct object_id *oid = &haves->oid[i];
1332                 struct object *o;
1333                 int we_knew_they_have = 0;
1334
1335                 if (!has_object_file(oid))
1336                         continue;
1337
1338                 oid_array_append(common, oid);
1339
1340                 o = parse_object(the_repository, oid);
1341                 if (!o)
1342                         die("oops (%s)", oid_to_hex(oid));
1343                 if (o->type == OBJ_COMMIT) {
1344                         struct commit_list *parents;
1345                         struct commit *commit = (struct commit *)o;
1346                         if (o->flags & THEY_HAVE)
1347                                 we_knew_they_have = 1;
1348                         else
1349                                 o->flags |= THEY_HAVE;
1350                         if (!oldest_have || (commit->date < oldest_have))
1351                                 oldest_have = commit->date;
1352                         for (parents = commit->parents;
1353                              parents;
1354                              parents = parents->next)
1355                                 parents->item->object.flags |= THEY_HAVE;
1356                 }
1357                 if (!we_knew_they_have)
1358                         add_object_array(o, NULL, have_obj);
1359         }
1360
1361         return 0;
1362 }
1363
1364 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1365                      const struct object_array *have_obj,
1366                      struct object_array *want_obj)
1367 {
1368         int i;
1369
1370         packet_writer_write(writer, "acknowledgments\n");
1371
1372         /* Send Acks */
1373         if (!acks->nr)
1374                 packet_writer_write(writer, "NAK\n");
1375
1376         for (i = 0; i < acks->nr; i++) {
1377                 packet_writer_write(writer, "ACK %s\n",
1378                                     oid_to_hex(&acks->oid[i]));
1379         }
1380
1381         if (ok_to_give_up(have_obj, want_obj)) {
1382                 /* Send Ready */
1383                 packet_writer_write(writer, "ready\n");
1384                 return 1;
1385         }
1386
1387         return 0;
1388 }
1389
1390 static int process_haves_and_send_acks(struct upload_pack_data *data,
1391                                        struct object_array *have_obj,
1392                                        struct object_array *want_obj)
1393 {
1394         struct oid_array common = OID_ARRAY_INIT;
1395         int ret = 0;
1396
1397         process_haves(&data->haves, &common, have_obj);
1398         if (data->done) {
1399                 ret = 1;
1400         } else if (send_acks(&data->writer, &common, have_obj, want_obj)) {
1401                 packet_writer_delim(&data->writer);
1402                 ret = 1;
1403         } else {
1404                 /* Add Flush */
1405                 packet_writer_flush(&data->writer);
1406                 ret = 0;
1407         }
1408
1409         oid_array_clear(&data->haves);
1410         oid_array_clear(&common);
1411         return ret;
1412 }
1413
1414 static void send_wanted_ref_info(struct upload_pack_data *data)
1415 {
1416         const struct string_list_item *item;
1417
1418         if (!data->wanted_refs.nr)
1419                 return;
1420
1421         packet_writer_write(&data->writer, "wanted-refs\n");
1422
1423         for_each_string_list_item(item, &data->wanted_refs) {
1424                 packet_writer_write(&data->writer, "%s %s\n",
1425                                     oid_to_hex(item->util),
1426                                     item->string);
1427         }
1428
1429         packet_writer_delim(&data->writer);
1430 }
1431
1432 static void send_shallow_info(struct upload_pack_data *data,
1433                               struct object_array *want_obj)
1434 {
1435         /* No shallow info needs to be sent */
1436         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1437             !is_repository_shallow(the_repository))
1438                 return;
1439
1440         packet_writer_write(&data->writer, "shallow-info\n");
1441
1442         if (!send_shallow_list(&data->writer, data->depth,
1443                                data->deepen_rev_list,
1444                                data->deepen_since, &data->deepen_not,
1445                                data->deepen_relative,
1446                                &data->shallows, want_obj) &&
1447             is_repository_shallow(the_repository))
1448                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1449                        &data->shallows, want_obj);
1450
1451         packet_delim(1);
1452 }
1453
1454 enum fetch_state {
1455         FETCH_PROCESS_ARGS = 0,
1456         FETCH_SEND_ACKS,
1457         FETCH_SEND_PACK,
1458         FETCH_DONE,
1459 };
1460
1461 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1462                    struct packet_reader *request)
1463 {
1464         enum fetch_state state = FETCH_PROCESS_ARGS;
1465         struct upload_pack_data data;
1466         struct object_array have_obj = OBJECT_ARRAY_INIT;
1467         struct object_array want_obj = OBJECT_ARRAY_INIT;
1468
1469         clear_object_flags(ALL_FLAGS);
1470
1471         git_config(upload_pack_config, NULL);
1472
1473         upload_pack_data_init(&data);
1474         use_sideband = LARGE_PACKET_MAX;
1475
1476         while (state != FETCH_DONE) {
1477                 switch (state) {
1478                 case FETCH_PROCESS_ARGS:
1479                         process_args(request, &data, &want_obj);
1480
1481                         if (!want_obj.nr) {
1482                                 /*
1483                                  * Request didn't contain any 'want' lines,
1484                                  * guess they didn't want anything.
1485                                  */
1486                                 state = FETCH_DONE;
1487                         } else if (data.haves.nr) {
1488                                 /*
1489                                  * Request had 'have' lines, so lets ACK them.
1490                                  */
1491                                 state = FETCH_SEND_ACKS;
1492                         } else {
1493                                 /*
1494                                  * Request had 'want's but no 'have's so we can
1495                                  * immedietly go to construct and send a pack.
1496                                  */
1497                                 state = FETCH_SEND_PACK;
1498                         }
1499                         break;
1500                 case FETCH_SEND_ACKS:
1501                         if (process_haves_and_send_acks(&data, &have_obj,
1502                                                         &want_obj))
1503                                 state = FETCH_SEND_PACK;
1504                         else
1505                                 state = FETCH_DONE;
1506                         break;
1507                 case FETCH_SEND_PACK:
1508                         send_wanted_ref_info(&data);
1509                         send_shallow_info(&data, &want_obj);
1510
1511                         packet_writer_write(&data.writer, "packfile\n");
1512                         create_pack_file(&have_obj, &want_obj);
1513                         state = FETCH_DONE;
1514                         break;
1515                 case FETCH_DONE:
1516                         continue;
1517                 }
1518         }
1519
1520         upload_pack_data_clear(&data);
1521         object_array_clear(&have_obj);
1522         object_array_clear(&want_obj);
1523         return 0;
1524 }
1525
1526 int upload_pack_advertise(struct repository *r,
1527                           struct strbuf *value)
1528 {
1529         if (value) {
1530                 int allow_filter_value;
1531                 int allow_ref_in_want;
1532                 int allow_sideband_all_value;
1533
1534                 strbuf_addstr(value, "shallow");
1535
1536                 if (!repo_config_get_bool(the_repository,
1537                                          "uploadpack.allowfilter",
1538                                          &allow_filter_value) &&
1539                     allow_filter_value)
1540                         strbuf_addstr(value, " filter");
1541
1542                 if (!repo_config_get_bool(the_repository,
1543                                          "uploadpack.allowrefinwant",
1544                                          &allow_ref_in_want) &&
1545                     allow_ref_in_want)
1546                         strbuf_addstr(value, " ref-in-want");
1547
1548                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1549                     (!repo_config_get_bool(the_repository,
1550                                            "uploadpack.allowsidebandall",
1551                                            &allow_sideband_all_value) &&
1552                      allow_sideband_all_value))
1553                         strbuf_addstr(value, " sideband-all");
1554         }
1555
1556         return 1;
1557 }