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

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "repository.h"
   7 #include "object-store.h"
   8 #include "tag.h"
   9 #include "object.h"
  10 #include "commit.h"
  11 #include "diff.h"
  12 #include "revision.h"
  13 #include "list-objects.h"
  14 #include "list-objects-filter.h"
  15 #include "list-objects-filter-options.h"
  16 #include "run-command.h"
  17 #include "connect.h"
  18 #include "sigchain.h"
  19 #include "version.h"
  20 #include "string-list.h"
  21 #include "argv-array.h"
  22 #include "prio-queue.h"
  23 #include "protocol.h"
  24 #include "quote.h"
  25 #include "upload-pack.h"
  26 #include "serve.h"
  27 #include "commit-graph.h"
  28 #include "commit-reach.h"
  29 #include "shallow.h"
  30
  31 /* Remember to update object flag allocation in object.h */
  32 #define THEY_HAVE       (1u << 11)
  33 #define OUR_REF         (1u << 12)
  34 #define WANTED          (1u << 13)
  35 #define COMMON_KNOWN    (1u << 14)
  36
  37 #define SHALLOW         (1u << 16)
  38 #define NOT_SHALLOW     (1u << 17)
  39 #define CLIENT_SHALLOW  (1u << 18)
  40 #define HIDDEN_REF      (1u << 19)
  41
  42 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
  43                 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
  44
  45 static timestamp_t oldest_have;
  46
  47 static int multi_ack;
  48 static int no_done;
  49 static int use_thin_pack, use_ofs_delta, use_include_tag;
  50 static int no_progress, daemon_mode;
  51 /* Allow specifying sha1 if it is a ref tip. */
  52 #define ALLOW_TIP_SHA1  01
  53 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  54 #define ALLOW_REACHABLE_SHA1    02
  55 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  56 #define ALLOW_ANY_SHA1  07
  57 static unsigned int allow_unadvertised_object_request;
  58 static int shallow_nr;
  59 static struct object_array extra_edge_obj;
  60 static unsigned int timeout;
  61 static int keepalive = 5;
  62 /* 0 for no sideband,
  63  * otherwise maximum packet size (up to 65520 bytes).
  64  */
  65 static int use_sideband;
  66 static int stateless_rpc;
  67 static const char *pack_objects_hook;
  68
  69 static int filter_capability_requested;
  70 static int allow_filter;
  71 static int allow_ref_in_want;
  72
  73 static int allow_sideband_all;
  74
  75 struct upload_pack_data {
  76         struct string_list wanted_refs;
  77         struct object_array want_obj;
  78         struct object_array have_obj;
  79         struct oid_array haves;
  80
  81         struct object_array shallows;
  82         struct string_list deepen_not;
  83         int depth;
  84         timestamp_t deepen_since;
  85         int deepen_rev_list;
  86         int deepen_relative;
  87
  88         struct list_objects_filter_options filter_options;
  89
  90         struct packet_writer writer;
  91
  92         unsigned stateless_rpc : 1;
  93
  94         unsigned use_thin_pack : 1;
  95         unsigned use_ofs_delta : 1;
  96         unsigned no_progress : 1;
  97         unsigned use_include_tag : 1;
  98         unsigned done : 1;
  99 };
 100
 101 static void upload_pack_data_init(struct upload_pack_data *data)
 102 {
 103         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 104         struct object_array want_obj = OBJECT_ARRAY_INIT;
 105         struct object_array have_obj = OBJECT_ARRAY_INIT;
 106         struct oid_array haves = OID_ARRAY_INIT;
 107         struct object_array shallows = OBJECT_ARRAY_INIT;
 108         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 109
 110         memset(data, 0, sizeof(*data));
 111         data->wanted_refs = wanted_refs;
 112         data->want_obj = want_obj;
 113         data->have_obj = have_obj;
 114         data->haves = haves;
 115         data->shallows = shallows;
 116         data->deepen_not = deepen_not;
 117         packet_writer_init(&data->writer, 1);
 118 }
 119
 120 static void upload_pack_data_clear(struct upload_pack_data *data)
 121 {
 122         string_list_clear(&data->wanted_refs, 1);
 123         object_array_clear(&data->want_obj);
 124         object_array_clear(&data->have_obj);
 125         oid_array_clear(&data->haves);
 126         object_array_clear(&data->shallows);
 127         string_list_clear(&data->deepen_not, 0);
 128         list_objects_filter_release(&data->filter_options);
 129 }
 130
 131 static void reset_timeout(void)
 132 {
 133         alarm(timeout);
 134 }
 135
 136 static void send_client_data(int fd, const char *data, ssize_t sz)
 137 {
 138         if (use_sideband) {
 139                 send_sideband(1, fd, data, sz, use_sideband);
 140                 return;
 141         }
 142         if (fd == 3)
 143                 /* emergency quit */
 144                 fd = 2;
 145         if (fd == 2) {
 146                 /* XXX: are we happy to lose stuff here? */
 147                 xwrite(fd, data, sz);
 148                 return;
 149         }
 150         write_or_die(fd, data, sz);
 151 }
 152
 153 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 154 {
 155         FILE *fp = cb_data;
 156         if (graft->nr_parent == -1)
 157                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 158         return 0;
 159 }
 160
 161 static void create_pack_file(const struct object_array *have_obj,
 162                              const struct object_array *want_obj,
 163                              struct list_objects_filter_options *filter_options)
 164 {
 165         struct child_process pack_objects = CHILD_PROCESS_INIT;
 166         char data[8193], progress[128];
 167         char abort_msg[] = "aborting due to possible repository "
 168                 "corruption on the remote side.";
 169         int buffered = -1;
 170         ssize_t sz;
 171         int i;
 172         FILE *pipe_fd;
 173
 174         if (!pack_objects_hook)
 175                 pack_objects.git_cmd = 1;
 176         else {
 177                 argv_array_push(&pack_objects.args, pack_objects_hook);
 178                 argv_array_push(&pack_objects.args, "git");
 179                 pack_objects.use_shell = 1;
 180         }
 181
 182         if (shallow_nr) {
 183                 argv_array_push(&pack_objects.args, "--shallow-file");
 184                 argv_array_push(&pack_objects.args, "");
 185         }
 186         argv_array_push(&pack_objects.args, "pack-objects");
 187         argv_array_push(&pack_objects.args, "--revs");
 188         if (use_thin_pack)
 189                 argv_array_push(&pack_objects.args, "--thin");
 190
 191         argv_array_push(&pack_objects.args, "--stdout");
 192         if (shallow_nr)
 193                 argv_array_push(&pack_objects.args, "--shallow");
 194         if (!no_progress)
 195                 argv_array_push(&pack_objects.args, "--progress");
 196         if (use_ofs_delta)
 197                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 198         if (use_include_tag)
 199                 argv_array_push(&pack_objects.args, "--include-tag");
 200         if (filter_options->choice) {
 201                 const char *spec =
 202                         expand_list_objects_filter_spec(filter_options);
 203                 if (pack_objects.use_shell) {
 204                         struct strbuf buf = STRBUF_INIT;
 205                         sq_quote_buf(&buf, spec);
 206                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 207                         strbuf_release(&buf);
 208                 } else {
 209                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 210                                          spec);
 211                 }
 212         }
 213
 214         pack_objects.in = -1;
 215         pack_objects.out = -1;
 216         pack_objects.err = -1;
 217
 218         if (start_command(&pack_objects))
 219                 die("git upload-pack: unable to fork git-pack-objects");
 220
 221         pipe_fd = xfdopen(pack_objects.in, "w");
 222
 223         if (shallow_nr)
 224                 for_each_commit_graft(write_one_shallow, pipe_fd);
 225
 226         for (i = 0; i < want_obj->nr; i++)
 227                 fprintf(pipe_fd, "%s\n",
 228                         oid_to_hex(&want_obj->objects[i].item->oid));
 229         fprintf(pipe_fd, "--not\n");
 230         for (i = 0; i < have_obj->nr; i++)
 231                 fprintf(pipe_fd, "%s\n",
 232                         oid_to_hex(&have_obj->objects[i].item->oid));
 233         for (i = 0; i < extra_edge_obj.nr; i++)
 234                 fprintf(pipe_fd, "%s\n",
 235                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 236         fprintf(pipe_fd, "\n");
 237         fflush(pipe_fd);
 238         fclose(pipe_fd);
 239
 240         /* We read from pack_objects.err to capture stderr output for
 241          * progress bar, and pack_objects.out to capture the pack data.
 242          */
 243
 244         while (1) {
 245                 struct pollfd pfd[2];
 246                 int pe, pu, pollsize;
 247                 int ret;
 248
 249                 reset_timeout();
 250
 251                 pollsize = 0;
 252                 pe = pu = -1;
 253
 254                 if (0 <= pack_objects.out) {
 255                         pfd[pollsize].fd = pack_objects.out;
 256                         pfd[pollsize].events = POLLIN;
 257                         pu = pollsize;
 258                         pollsize++;
 259                 }
 260                 if (0 <= pack_objects.err) {
 261                         pfd[pollsize].fd = pack_objects.err;
 262                         pfd[pollsize].events = POLLIN;
 263                         pe = pollsize;
 264                         pollsize++;
 265                 }
 266
 267                 if (!pollsize)
 268                         break;
 269
 270                 ret = poll(pfd, pollsize,
 271                         keepalive < 0 ? -1 : 1000 * keepalive);
 272
 273                 if (ret < 0) {
 274                         if (errno != EINTR) {
 275                                 error_errno("poll failed, resuming");
 276                                 sleep(1);
 277                         }
 278                         continue;
 279                 }
 280                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 281                         /* Status ready; we ship that in the side-band
 282                          * or dump to the standard error.
 283                          */
 284                         sz = xread(pack_objects.err, progress,
 285                                   sizeof(progress));
 286                         if (0 < sz)
 287                                 send_client_data(2, progress, sz);
 288                         else if (sz == 0) {
 289                                 close(pack_objects.err);
 290                                 pack_objects.err = -1;
 291                         }
 292                         else
 293                                 goto fail;
 294                         /* give priority to status messages */
 295                         continue;
 296                 }
 297                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 298                         /* Data ready; we keep the last byte to ourselves
 299                          * in case we detect broken rev-list, so that we
 300                          * can leave the stream corrupted.  This is
 301                          * unfortunate -- unpack-objects would happily
 302                          * accept a valid packdata with trailing garbage,
 303                          * so appending garbage after we pass all the
 304                          * pack data is not good enough to signal
 305                          * breakage to downstream.
 306                          */
 307                         char *cp = data;
 308                         ssize_t outsz = 0;
 309                         if (0 <= buffered) {
 310                                 *cp++ = buffered;
 311                                 outsz++;
 312                         }
 313                         sz = xread(pack_objects.out, cp,
 314                                   sizeof(data) - outsz);
 315                         if (0 < sz)
 316                                 ;
 317                         else if (sz == 0) {
 318                                 close(pack_objects.out);
 319                                 pack_objects.out = -1;
 320                         }
 321                         else
 322                                 goto fail;
 323                         sz += outsz;
 324                         if (1 < sz) {
 325                                 buffered = data[sz-1] & 0xFF;
 326                                 sz--;
 327                         }
 328                         else
 329                                 buffered = -1;
 330                         send_client_data(1, data, sz);
 331                 }
 332
 333                 /*
 334                  * We hit the keepalive timeout without saying anything; send
 335                  * an empty message on the data sideband just to let the other
 336                  * side know we're still working on it, but don't have any data
 337                  * yet.
 338                  *
 339                  * If we don't have a sideband channel, there's no room in the
 340                  * protocol to say anything, so those clients are just out of
 341                  * luck.
 342                  */
 343                 if (!ret && use_sideband) {
 344                         static const char buf[] = "0005\1";
 345                         write_or_die(1, buf, 5);
 346                 }
 347         }
 348
 349         if (finish_command(&pack_objects)) {
 350                 error("git upload-pack: git-pack-objects died with error.");
 351                 goto fail;
 352         }
 353
 354         /* flush the data */
 355         if (0 <= buffered) {
 356                 data[0] = buffered;
 357                 send_client_data(1, data, 1);
 358                 fprintf(stderr, "flushed.\n");
 359         }
 360         if (use_sideband)
 361                 packet_flush(1);
 362         return;
 363
 364  fail:
 365         send_client_data(3, abort_msg, sizeof(abort_msg));
 366         die("git upload-pack: %s", abort_msg);
 367 }
 368
 369 static int got_oid(const char *hex, struct object_id *oid,
 370                    struct object_array *have_obj)
 371 {
 372         struct object *o;
 373         int we_knew_they_have = 0;
 374
 375         if (get_oid_hex(hex, oid))
 376                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 377         if (!has_object_file(oid))
 378                 return -1;
 379
 380         o = parse_object(the_repository, oid);
 381         if (!o)
 382                 die("oops (%s)", oid_to_hex(oid));
 383         if (o->type == OBJ_COMMIT) {
 384                 struct commit_list *parents;
 385                 struct commit *commit = (struct commit *)o;
 386                 if (o->flags & THEY_HAVE)
 387                         we_knew_they_have = 1;
 388                 else
 389                         o->flags |= THEY_HAVE;
 390                 if (!oldest_have || (commit->date < oldest_have))
 391                         oldest_have = commit->date;
 392                 for (parents = commit->parents;
 393                      parents;
 394                      parents = parents->next)
 395                         parents->item->object.flags |= THEY_HAVE;
 396         }
 397         if (!we_knew_they_have) {
 398                 add_object_array(o, NULL, have_obj);
 399                 return 1;
 400         }
 401         return 0;
 402 }
 403
 404 static int ok_to_give_up(const struct object_array *have_obj,
 405                          struct object_array *want_obj)
 406 {
 407         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 408
 409         if (!have_obj->nr)
 410                 return 0;
 411
 412         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 413                                             COMMON_KNOWN, oldest_have,
 414                                             min_generation);
 415 }
 416
 417 static int get_common_commits(struct packet_reader *reader,
 418                               struct object_array *have_obj,
 419                               struct object_array *want_obj)
 420 {
 421         struct object_id oid;
 422         char last_hex[GIT_MAX_HEXSZ + 1];
 423         int got_common = 0;
 424         int got_other = 0;
 425         int sent_ready = 0;
 426
 427         save_commit_buffer = 0;
 428
 429         for (;;) {
 430                 const char *arg;
 431
 432                 reset_timeout();
 433
 434                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 435                         if (multi_ack == 2 && got_common
 436                             && !got_other && ok_to_give_up(have_obj, want_obj)) {
 437                                 sent_ready = 1;
 438                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 439                         }
 440                         if (have_obj->nr == 0 || multi_ack)
 441                                 packet_write_fmt(1, "NAK\n");
 442
 443                         if (no_done && sent_ready) {
 444                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 445                                 return 0;
 446                         }
 447                         if (stateless_rpc)
 448                                 exit(0);
 449                         got_common = 0;
 450                         got_other = 0;
 451                         continue;
 452                 }
 453                 if (skip_prefix(reader->line, "have ", &arg)) {
 454                         switch (got_oid(arg, &oid, have_obj)) {
 455                         case -1: /* they have what we do not */
 456                                 got_other = 1;
 457                                 if (multi_ack && ok_to_give_up(have_obj, want_obj)) {
 458                                         const char *hex = oid_to_hex(&oid);
 459                                         if (multi_ack == 2) {
 460                                                 sent_ready = 1;
 461                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 462                                         } else
 463                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 464                                 }
 465                                 break;
 466                         default:
 467                                 got_common = 1;
 468                                 oid_to_hex_r(last_hex, &oid);
 469                                 if (multi_ack == 2)
 470                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 471                                 else if (multi_ack)
 472                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 473                                 else if (have_obj->nr == 1)
 474                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 475                                 break;
 476                         }
 477                         continue;
 478                 }
 479                 if (!strcmp(reader->line, "done")) {
 480                         if (have_obj->nr > 0) {
 481                                 if (multi_ack)
 482                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 483                                 return 0;
 484                         }
 485                         packet_write_fmt(1, "NAK\n");
 486                         return -1;
 487                 }
 488                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 489         }
 490 }
 491
 492 static int is_our_ref(struct object *o)
 493 {
 494         int allow_hidden_ref = (allow_unadvertised_object_request &
 495                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 496         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 497 }
 498
 499 /*
 500  * on successful case, it's up to the caller to close cmd->out
 501  */
 502 static int do_reachable_revlist(struct child_process *cmd,
 503                                 struct object_array *src,
 504                                 struct object_array *reachable)
 505 {
 506         static const char *argv[] = {
 507                 "rev-list", "--stdin", NULL,
 508         };
 509         struct object *o;
 510         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 511         int i;
 512         const unsigned hexsz = the_hash_algo->hexsz;
 513
 514         cmd->argv = argv;
 515         cmd->git_cmd = 1;
 516         cmd->no_stderr = 1;
 517         cmd->in = -1;
 518         cmd->out = -1;
 519
 520         /*
 521          * If the next rev-list --stdin encounters an unknown commit,
 522          * it terminates, which will cause SIGPIPE in the write loop
 523          * below.
 524          */
 525         sigchain_push(SIGPIPE, SIG_IGN);
 526
 527         if (start_command(cmd))
 528                 goto error;
 529
 530         namebuf[0] = '^';
 531         namebuf[hexsz + 1] = '\n';
 532         for (i = get_max_object_index(); 0 < i; ) {
 533                 o = get_indexed_object(--i);
 534                 if (!o)
 535                         continue;
 536                 if (reachable && o->type == OBJ_COMMIT)
 537                         o->flags &= ~TMP_MARK;
 538                 if (!is_our_ref(o))
 539                         continue;
 540                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 541                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 542                         goto error;
 543         }
 544         namebuf[hexsz] = '\n';
 545         for (i = 0; i < src->nr; i++) {
 546                 o = src->objects[i].item;
 547                 if (is_our_ref(o)) {
 548                         if (reachable)
 549                                 add_object_array(o, NULL, reachable);
 550                         continue;
 551                 }
 552                 if (reachable && o->type == OBJ_COMMIT)
 553                         o->flags |= TMP_MARK;
 554                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 555                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 556                         goto error;
 557         }
 558         close(cmd->in);
 559         cmd->in = -1;
 560         sigchain_pop(SIGPIPE);
 561
 562         return 0;
 563
 564 error:
 565         sigchain_pop(SIGPIPE);
 566
 567         if (cmd->in >= 0)
 568                 close(cmd->in);
 569         if (cmd->out >= 0)
 570                 close(cmd->out);
 571         return -1;
 572 }
 573
 574 static int get_reachable_list(struct object_array *src,
 575                               struct object_array *reachable)
 576 {
 577         struct child_process cmd = CHILD_PROCESS_INIT;
 578         int i;
 579         struct object *o;
 580         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 581         const unsigned hexsz = the_hash_algo->hexsz;
 582
 583         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 584                 return -1;
 585
 586         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 587                 struct object_id oid;
 588                 const char *p;
 589
 590                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 591                         break;
 592
 593                 o = lookup_object(the_repository, &oid);
 594                 if (o && o->type == OBJ_COMMIT) {
 595                         o->flags &= ~TMP_MARK;
 596                 }
 597         }
 598         for (i = get_max_object_index(); 0 < i; i--) {
 599                 o = get_indexed_object(i - 1);
 600                 if (o && o->type == OBJ_COMMIT &&
 601                     (o->flags & TMP_MARK)) {
 602                         add_object_array(o, NULL, reachable);
 603                                 o->flags &= ~TMP_MARK;
 604                 }
 605         }
 606         close(cmd.out);
 607
 608         if (finish_command(&cmd))
 609                 return -1;
 610
 611         return 0;
 612 }
 613
 614 static int has_unreachable(struct object_array *src)
 615 {
 616         struct child_process cmd = CHILD_PROCESS_INIT;
 617         char buf[1];
 618         int i;
 619
 620         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 621                 return 1;
 622
 623         /*
 624          * The commits out of the rev-list are not ancestors of
 625          * our ref.
 626          */
 627         i = read_in_full(cmd.out, buf, 1);
 628         if (i)
 629                 goto error;
 630         close(cmd.out);
 631         cmd.out = -1;
 632
 633         /*
 634          * rev-list may have died by encountering a bad commit
 635          * in the history, in which case we do want to bail out
 636          * even when it showed no commit.
 637          */
 638         if (finish_command(&cmd))
 639                 goto error;
 640
 641         /* All the non-tip ones are ancestors of what we advertised */
 642         return 0;
 643
 644 error:
 645         sigchain_pop(SIGPIPE);
 646         if (cmd.out >= 0)
 647                 close(cmd.out);
 648         return 1;
 649 }
 650
 651 static void check_non_tip(struct object_array *want_obj,
 652                           struct packet_writer *writer)
 653 {
 654         int i;
 655
 656         /*
 657          * In the normal in-process case without
 658          * uploadpack.allowReachableSHA1InWant,
 659          * non-tip requests can never happen.
 660          */
 661         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 662                 goto error;
 663         if (!has_unreachable(want_obj))
 664                 /* All the non-tip ones are ancestors of what we advertised */
 665                 return;
 666
 667 error:
 668         /* Pick one of them (we know there at least is one) */
 669         for (i = 0; i < want_obj->nr; i++) {
 670                 struct object *o = want_obj->objects[i].item;
 671                 if (!is_our_ref(o)) {
 672                         packet_writer_error(writer,
 673                                             "upload-pack: not our ref %s",
 674                                             oid_to_hex(&o->oid));
 675                         die("git upload-pack: not our ref %s",
 676                             oid_to_hex(&o->oid));
 677                 }
 678         }
 679 }
 680
 681 static void send_shallow(struct packet_writer *writer,
 682                          struct commit_list *result)
 683 {
 684         while (result) {
 685                 struct object *object = &result->item->object;
 686                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 687                         packet_writer_write(writer, "shallow %s",
 688                                             oid_to_hex(&object->oid));
 689                         register_shallow(the_repository, &object->oid);
 690                         shallow_nr++;
 691                 }
 692                 result = result->next;
 693         }
 694 }
 695
 696 static void send_unshallow(struct packet_writer *writer,
 697                            const struct object_array *shallows,
 698                            struct object_array *want_obj)
 699 {
 700         int i;
 701
 702         for (i = 0; i < shallows->nr; i++) {
 703                 struct object *object = shallows->objects[i].item;
 704                 if (object->flags & NOT_SHALLOW) {
 705                         struct commit_list *parents;
 706                         packet_writer_write(writer, "unshallow %s",
 707                                             oid_to_hex(&object->oid));
 708                         object->flags &= ~CLIENT_SHALLOW;
 709                         /*
 710                          * We want to _register_ "object" as shallow, but we
 711                          * also need to traverse object's parents to deepen a
 712                          * shallow clone. Unregister it for now so we can
 713                          * parse and add the parents to the want list, then
 714                          * re-register it.
 715                          */
 716                         unregister_shallow(&object->oid);
 717                         object->parsed = 0;
 718                         parse_commit_or_die((struct commit *)object);
 719                         parents = ((struct commit *)object)->parents;
 720                         while (parents) {
 721                                 add_object_array(&parents->item->object,
 722                                                  NULL, want_obj);
 723                                 parents = parents->next;
 724                         }
 725                         add_object_array(object, NULL, &extra_edge_obj);
 726                 }
 727                 /* make sure commit traversal conforms to client */
 728                 register_shallow(the_repository, &object->oid);
 729         }
 730 }
 731
 732 static int check_ref(const char *refname_full, const struct object_id *oid,
 733                      int flag, void *cb_data);
 734 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
 735                    struct object_array *shallows, struct object_array *want_obj)
 736 {
 737         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 738                 int i;
 739
 740                 for (i = 0; i < shallows->nr; i++) {
 741                         struct object *object = shallows->objects[i].item;
 742                         object->flags |= NOT_SHALLOW;
 743                 }
 744         } else if (deepen_relative) {
 745                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 746                 struct commit_list *result;
 747
 748                 /*
 749                  * Checking for reachable shallows requires that our refs be
 750                  * marked with OUR_REF.
 751                  */
 752                 head_ref_namespaced(check_ref, NULL);
 753                 for_each_namespaced_ref(check_ref, NULL);
 754
 755                 get_reachable_list(shallows, &reachable_shallows);
 756                 result = get_shallow_commits(&reachable_shallows,
 757                                              depth + 1,
 758                                              SHALLOW, NOT_SHALLOW);
 759                 send_shallow(writer, result);
 760                 free_commit_list(result);
 761                 object_array_clear(&reachable_shallows);
 762         } else {
 763                 struct commit_list *result;
 764
 765                 result = get_shallow_commits(want_obj, depth,
 766                                              SHALLOW, NOT_SHALLOW);
 767                 send_shallow(writer, result);
 768                 free_commit_list(result);
 769         }
 770
 771         send_unshallow(writer, shallows, want_obj);
 772 }
 773
 774 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
 775                                const char **av,
 776                                struct object_array *shallows,
 777                                struct object_array *want_obj)
 778 {
 779         struct commit_list *result;
 780
 781         disable_commit_graph(the_repository);
 782         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 783         send_shallow(writer, result);
 784         free_commit_list(result);
 785         send_unshallow(writer, shallows, want_obj);
 786 }
 787
 788 /* Returns 1 if a shallow list is sent or 0 otherwise */
 789 static int send_shallow_list(struct packet_writer *writer,
 790                              int depth, int deepen_rev_list,
 791                              timestamp_t deepen_since,
 792                              struct string_list *deepen_not,
 793                              int deepen_relative,
 794                              struct object_array *shallows,
 795                              struct object_array *want_obj)
 796 {
 797         int ret = 0;
 798
 799         if (depth > 0 && deepen_rev_list)
 800                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 801         if (depth > 0) {
 802                 deepen(writer, depth, deepen_relative, shallows, want_obj);
 803                 ret = 1;
 804         } else if (deepen_rev_list) {
 805                 struct argv_array av = ARGV_ARRAY_INIT;
 806                 int i;
 807
 808                 argv_array_push(&av, "rev-list");
 809                 if (deepen_since)
 810                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 811                 if (deepen_not->nr) {
 812                         argv_array_push(&av, "--not");
 813                         for (i = 0; i < deepen_not->nr; i++) {
 814                                 struct string_list_item *s = deepen_not->items + i;
 815                                 argv_array_push(&av, s->string);
 816                         }
 817                         argv_array_push(&av, "--not");
 818                 }
 819                 for (i = 0; i < want_obj->nr; i++) {
 820                         struct object *o = want_obj->objects[i].item;
 821                         argv_array_push(&av, oid_to_hex(&o->oid));
 822                 }
 823                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
 824                 argv_array_clear(&av);
 825                 ret = 1;
 826         } else {
 827                 if (shallows->nr > 0) {
 828                         int i;
 829                         for (i = 0; i < shallows->nr; i++)
 830                                 register_shallow(the_repository,
 831                                                  &shallows->objects[i].item->oid);
 832                 }
 833         }
 834
 835         shallow_nr += shallows->nr;
 836         return ret;
 837 }
 838
 839 static int process_shallow(const char *line, struct object_array *shallows)
 840 {
 841         const char *arg;
 842         if (skip_prefix(line, "shallow ", &arg)) {
 843                 struct object_id oid;
 844                 struct object *object;
 845                 if (get_oid_hex(arg, &oid))
 846                         die("invalid shallow line: %s", line);
 847                 object = parse_object(the_repository, &oid);
 848                 if (!object)
 849                         return 1;
 850                 if (object->type != OBJ_COMMIT)
 851                         die("invalid shallow object %s", oid_to_hex(&oid));
 852                 if (!(object->flags & CLIENT_SHALLOW)) {
 853                         object->flags |= CLIENT_SHALLOW;
 854                         add_object_array(object, NULL, shallows);
 855                 }
 856                 return 1;
 857         }
 858
 859         return 0;
 860 }
 861
 862 static int process_deepen(const char *line, int *depth)
 863 {
 864         const char *arg;
 865         if (skip_prefix(line, "deepen ", &arg)) {
 866                 char *end = NULL;
 867                 *depth = (int)strtol(arg, &end, 0);
 868                 if (!end || *end || *depth <= 0)
 869                         die("Invalid deepen: %s", line);
 870                 return 1;
 871         }
 872
 873         return 0;
 874 }
 875
 876 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 877 {
 878         const char *arg;
 879         if (skip_prefix(line, "deepen-since ", &arg)) {
 880                 char *end = NULL;
 881                 *deepen_since = parse_timestamp(arg, &end, 0);
 882                 if (!end || *end || !deepen_since ||
 883                     /* revisions.c's max_age -1 is special */
 884                     *deepen_since == -1)
 885                         die("Invalid deepen-since: %s", line);
 886                 *deepen_rev_list = 1;
 887                 return 1;
 888         }
 889         return 0;
 890 }
 891
 892 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 893 {
 894         const char *arg;
 895         if (skip_prefix(line, "deepen-not ", &arg)) {
 896                 char *ref = NULL;
 897                 struct object_id oid;
 898                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 899                         die("git upload-pack: ambiguous deepen-not: %s", line);
 900                 string_list_append(deepen_not, ref);
 901                 free(ref);
 902                 *deepen_rev_list = 1;
 903                 return 1;
 904         }
 905         return 0;
 906 }
 907
 908 static void receive_needs(struct packet_reader *reader,
 909                           struct object_array *want_obj,
 910                           struct list_objects_filter_options *filter_options)
 911 {
 912         struct object_array shallows = OBJECT_ARRAY_INIT;
 913         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 914         int depth = 0;
 915         int has_non_tip = 0;
 916         timestamp_t deepen_since = 0;
 917         int deepen_rev_list = 0;
 918         int deepen_relative = 0;
 919         struct packet_writer writer;
 920
 921         shallow_nr = 0;
 922         packet_writer_init(&writer, 1);
 923         for (;;) {
 924                 struct object *o;
 925                 const char *features;
 926                 struct object_id oid_buf;
 927                 const char *arg;
 928
 929                 reset_timeout();
 930                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 931                         break;
 932
 933                 if (process_shallow(reader->line, &shallows))
 934                         continue;
 935                 if (process_deepen(reader->line, &depth))
 936                         continue;
 937                 if (process_deepen_since(reader->line, &deepen_since, &deepen_rev_list))
 938                         continue;
 939                 if (process_deepen_not(reader->line, &deepen_not, &deepen_rev_list))
 940                         continue;
 941
 942                 if (skip_prefix(reader->line, "filter ", &arg)) {
 943                         if (!filter_capability_requested)
 944                                 die("git upload-pack: filtering capability not negotiated");
 945                         list_objects_filter_die_if_populated(filter_options);
 946                         parse_list_objects_filter(filter_options, arg);
 947                         continue;
 948                 }
 949
 950                 if (!skip_prefix(reader->line, "want ", &arg) ||
 951                     parse_oid_hex(arg, &oid_buf, &features))
 952                         die("git upload-pack: protocol error, "
 953                             "expected to get object ID, not '%s'", reader->line);
 954
 955                 if (parse_feature_request(features, "deepen-relative"))
 956                         deepen_relative = 1;
 957                 if (parse_feature_request(features, "multi_ack_detailed"))
 958                         multi_ack = 2;
 959                 else if (parse_feature_request(features, "multi_ack"))
 960                         multi_ack = 1;
 961                 if (parse_feature_request(features, "no-done"))
 962                         no_done = 1;
 963                 if (parse_feature_request(features, "thin-pack"))
 964                         use_thin_pack = 1;
 965                 if (parse_feature_request(features, "ofs-delta"))
 966                         use_ofs_delta = 1;
 967                 if (parse_feature_request(features, "side-band-64k"))
 968                         use_sideband = LARGE_PACKET_MAX;
 969                 else if (parse_feature_request(features, "side-band"))
 970                         use_sideband = DEFAULT_PACKET_MAX;
 971                 if (parse_feature_request(features, "no-progress"))
 972                         no_progress = 1;
 973                 if (parse_feature_request(features, "include-tag"))
 974                         use_include_tag = 1;
 975                 if (allow_filter && parse_feature_request(features, "filter"))
 976                         filter_capability_requested = 1;
 977
 978                 o = parse_object(the_repository, &oid_buf);
 979                 if (!o) {
 980                         packet_writer_error(&writer,
 981                                             "upload-pack: not our ref %s",
 982                                             oid_to_hex(&oid_buf));
 983                         die("git upload-pack: not our ref %s",
 984                             oid_to_hex(&oid_buf));
 985                 }
 986                 if (!(o->flags & WANTED)) {
 987                         o->flags |= WANTED;
 988                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 989                               || is_our_ref(o)))
 990                                 has_non_tip = 1;
 991                         add_object_array(o, NULL, want_obj);
 992                 }
 993         }
 994
 995         /*
 996          * We have sent all our refs already, and the other end
 997          * should have chosen out of them. When we are operating
 998          * in the stateless RPC mode, however, their choice may
 999          * have been based on the set of older refs advertised
1000          * by another process that handled the initial request.
1001          */
1002         if (has_non_tip)
1003                 check_non_tip(want_obj, &writer);
1004
1005         if (!use_sideband && daemon_mode)
1006                 no_progress = 1;
1007
1008         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
1009                 return;
1010
1011         if (send_shallow_list(&writer, depth, deepen_rev_list, deepen_since,
1012                               &deepen_not, deepen_relative, &shallows,
1013                               want_obj))
1014                 packet_flush(1);
1015         object_array_clear(&shallows);
1016 }
1017
1018 /* return non-zero if the ref is hidden, otherwise 0 */
1019 static int mark_our_ref(const char *refname, const char *refname_full,
1020                         const struct object_id *oid)
1021 {
1022         struct object *o = lookup_unknown_object(oid);
1023
1024         if (ref_is_hidden(refname, refname_full)) {
1025                 o->flags |= HIDDEN_REF;
1026                 return 1;
1027         }
1028         o->flags |= OUR_REF;
1029         return 0;
1030 }
1031
1032 static int check_ref(const char *refname_full, const struct object_id *oid,
1033                      int flag, void *cb_data)
1034 {
1035         const char *refname = strip_namespace(refname_full);
1036
1037         mark_our_ref(refname, refname_full, oid);
1038         return 0;
1039 }
1040
1041 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1042 {
1043         struct string_list_item *item;
1044
1045         if (!symref->nr)
1046                 return;
1047         for_each_string_list_item(item, symref)
1048                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1049 }
1050
1051 static int send_ref(const char *refname, const struct object_id *oid,
1052                     int flag, void *cb_data)
1053 {
1054         static const char *capabilities = "multi_ack thin-pack side-band"
1055                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1056                 " deepen-relative no-progress include-tag multi_ack_detailed";
1057         const char *refname_nons = strip_namespace(refname);
1058         struct object_id peeled;
1059
1060         if (mark_our_ref(refname_nons, refname, oid))
1061                 return 0;
1062
1063         if (capabilities) {
1064                 struct strbuf symref_info = STRBUF_INIT;
1065
1066                 format_symref_info(&symref_info, cb_data);
1067                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1068                              oid_to_hex(oid), refname_nons,
1069                              0, capabilities,
1070                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1071                                      " allow-tip-sha1-in-want" : "",
1072                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1073                                      " allow-reachable-sha1-in-want" : "",
1074                              stateless_rpc ? " no-done" : "",
1075                              symref_info.buf,
1076                              allow_filter ? " filter" : "",
1077                              git_user_agent_sanitized());
1078                 strbuf_release(&symref_info);
1079         } else {
1080                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1081         }
1082         capabilities = NULL;
1083         if (!peel_ref(refname, &peeled))
1084                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1085         return 0;
1086 }
1087
1088 static int find_symref(const char *refname, const struct object_id *oid,
1089                        int flag, void *cb_data)
1090 {
1091         const char *symref_target;
1092         struct string_list_item *item;
1093
1094         if ((flag & REF_ISSYMREF) == 0)
1095                 return 0;
1096         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1097         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1098                 die("'%s' is a symref but it is not?", refname);
1099         item = string_list_append(cb_data, strip_namespace(refname));
1100         item->util = xstrdup(strip_namespace(symref_target));
1101         return 0;
1102 }
1103
1104 static int upload_pack_config(const char *var, const char *value, void *unused)
1105 {
1106         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1107                 if (git_config_bool(var, value))
1108                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1109                 else
1110                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1111         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1112                 if (git_config_bool(var, value))
1113                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1114                 else
1115                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1116         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1117                 if (git_config_bool(var, value))
1118                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1119                 else
1120                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1121         } else if (!strcmp("uploadpack.keepalive", var)) {
1122                 keepalive = git_config_int(var, value);
1123                 if (!keepalive)
1124                         keepalive = -1;
1125         } else if (!strcmp("uploadpack.allowfilter", var)) {
1126                 allow_filter = git_config_bool(var, value);
1127         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1128                 allow_ref_in_want = git_config_bool(var, value);
1129         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1130                 allow_sideband_all = git_config_bool(var, value);
1131         } else if (!strcmp("core.precomposeunicode", var)) {
1132                 precomposed_unicode = git_config_bool(var, value);
1133         }
1134
1135         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1136         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1137                 if (!strcmp("uploadpack.packobjectshook", var))
1138                         return git_config_string(&pack_objects_hook, var, value);
1139         }
1140
1141         return parse_hide_refs_config(var, value, "uploadpack");
1142 }
1143
1144 void upload_pack(struct upload_pack_options *options)
1145 {
1146         struct string_list symref = STRING_LIST_INIT_DUP;
1147         struct packet_reader reader;
1148         struct upload_pack_data data;
1149
1150         stateless_rpc = options->stateless_rpc;
1151         timeout = options->timeout;
1152         daemon_mode = options->daemon_mode;
1153
1154         git_config(upload_pack_config, NULL);
1155
1156         upload_pack_data_init(&data);
1157
1158         head_ref_namespaced(find_symref, &symref);
1159
1160         if (options->advertise_refs || !stateless_rpc) {
1161                 reset_timeout();
1162                 head_ref_namespaced(send_ref, &symref);
1163                 for_each_namespaced_ref(send_ref, &symref);
1164                 advertise_shallow_grafts(1);
1165                 packet_flush(1);
1166         } else {
1167                 head_ref_namespaced(check_ref, NULL);
1168                 for_each_namespaced_ref(check_ref, NULL);
1169         }
1170         string_list_clear(&symref, 1);
1171
1172         if (!options->advertise_refs) {
1173                 packet_reader_init(&reader, 0, NULL, 0,
1174                                    PACKET_READ_CHOMP_NEWLINE |
1175                                    PACKET_READ_DIE_ON_ERR_PACKET);
1176
1177                 receive_needs(&reader, &data.want_obj, &data.filter_options);
1178                 if (data.want_obj.nr) {
1179                         get_common_commits(&reader,
1180                                            &data.have_obj,
1181                                            &data.want_obj);
1182                         create_pack_file(&data.have_obj,
1183                                          &data.want_obj,
1184                                          &data.filter_options);
1185                 }
1186         }
1187
1188         upload_pack_data_clear(&data);
1189 }
1190
1191 static int parse_want(struct packet_writer *writer, const char *line,
1192                       struct object_array *want_obj)
1193 {
1194         const char *arg;
1195         if (skip_prefix(line, "want ", &arg)) {
1196                 struct object_id oid;
1197                 struct object *o;
1198
1199                 if (get_oid_hex(arg, &oid))
1200                         die("git upload-pack: protocol error, "
1201                             "expected to get oid, not '%s'", line);
1202
1203                 o = parse_object(the_repository, &oid);
1204                 if (!o) {
1205                         packet_writer_error(writer,
1206                                             "upload-pack: not our ref %s",
1207                                             oid_to_hex(&oid));
1208                         die("git upload-pack: not our ref %s",
1209                             oid_to_hex(&oid));
1210                 }
1211
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_want_ref(struct packet_writer *writer, const char *line,
1224                           struct string_list *wanted_refs,
1225                           struct object_array *want_obj)
1226 {
1227         const char *arg;
1228         if (skip_prefix(line, "want-ref ", &arg)) {
1229                 struct object_id oid;
1230                 struct string_list_item *item;
1231                 struct object *o;
1232
1233                 if (read_ref(arg, &oid)) {
1234                         packet_writer_error(writer, "unknown ref %s", arg);
1235                         die("unknown ref %s", arg);
1236                 }
1237
1238                 item = string_list_append(wanted_refs, arg);
1239                 item->util = oiddup(&oid);
1240
1241                 o = parse_object_or_die(&oid, arg);
1242                 if (!(o->flags & WANTED)) {
1243                         o->flags |= WANTED;
1244                         add_object_array(o, NULL, want_obj);
1245                 }
1246
1247                 return 1;
1248         }
1249
1250         return 0;
1251 }
1252
1253 static int parse_have(const char *line, struct oid_array *haves)
1254 {
1255         const char *arg;
1256         if (skip_prefix(line, "have ", &arg)) {
1257                 struct object_id oid;
1258
1259                 if (get_oid_hex(arg, &oid))
1260                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1261                 oid_array_append(haves, &oid);
1262                 return 1;
1263         }
1264
1265         return 0;
1266 }
1267
1268 static void process_args(struct packet_reader *request,
1269                          struct upload_pack_data *data)
1270 {
1271         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1272                 const char *arg = request->line;
1273                 const char *p;
1274
1275                 /* process want */
1276                 if (parse_want(&data->writer, arg, &data->want_obj))
1277                         continue;
1278                 if (allow_ref_in_want &&
1279                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1280                                    &data->want_obj))
1281                         continue;
1282                 /* process have line */
1283                 if (parse_have(arg, &data->haves))
1284                         continue;
1285
1286                 /* process args like thin-pack */
1287                 if (!strcmp(arg, "thin-pack")) {
1288                         use_thin_pack = 1;
1289                         continue;
1290                 }
1291                 if (!strcmp(arg, "ofs-delta")) {
1292                         use_ofs_delta = 1;
1293                         continue;
1294                 }
1295                 if (!strcmp(arg, "no-progress")) {
1296                         no_progress = 1;
1297                         continue;
1298                 }
1299                 if (!strcmp(arg, "include-tag")) {
1300                         use_include_tag = 1;
1301                         continue;
1302                 }
1303                 if (!strcmp(arg, "done")) {
1304                         data->done = 1;
1305                         continue;
1306                 }
1307
1308                 /* Shallow related arguments */
1309                 if (process_shallow(arg, &data->shallows))
1310                         continue;
1311                 if (process_deepen(arg, &data->depth))
1312                         continue;
1313                 if (process_deepen_since(arg, &data->deepen_since,
1314                                          &data->deepen_rev_list))
1315                         continue;
1316                 if (process_deepen_not(arg, &data->deepen_not,
1317                                        &data->deepen_rev_list))
1318                         continue;
1319                 if (!strcmp(arg, "deepen-relative")) {
1320                         data->deepen_relative = 1;
1321                         continue;
1322                 }
1323
1324                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1325                         list_objects_filter_die_if_populated(&data->filter_options);
1326                         parse_list_objects_filter(&data->filter_options, p);
1327                         continue;
1328                 }
1329
1330                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1331                      allow_sideband_all) &&
1332                     !strcmp(arg, "sideband-all")) {
1333                         data->writer.use_sideband = 1;
1334                         continue;
1335                 }
1336
1337                 /* ignore unknown lines maybe? */
1338                 die("unexpected line: '%s'", arg);
1339         }
1340
1341         if (request->status != PACKET_READ_FLUSH)
1342                 die(_("expected flush after fetch arguments"));
1343 }
1344
1345 static int process_haves(struct oid_array *haves, struct oid_array *common,
1346                          struct object_array *have_obj)
1347 {
1348         int i;
1349
1350         /* Process haves */
1351         for (i = 0; i < haves->nr; i++) {
1352                 const struct object_id *oid = &haves->oid[i];
1353                 struct object *o;
1354                 int we_knew_they_have = 0;
1355
1356                 if (!has_object_file(oid))
1357                         continue;
1358
1359                 oid_array_append(common, oid);
1360
1361                 o = parse_object(the_repository, oid);
1362                 if (!o)
1363                         die("oops (%s)", oid_to_hex(oid));
1364                 if (o->type == OBJ_COMMIT) {
1365                         struct commit_list *parents;
1366                         struct commit *commit = (struct commit *)o;
1367                         if (o->flags & THEY_HAVE)
1368                                 we_knew_they_have = 1;
1369                         else
1370                                 o->flags |= THEY_HAVE;
1371                         if (!oldest_have || (commit->date < oldest_have))
1372                                 oldest_have = commit->date;
1373                         for (parents = commit->parents;
1374                              parents;
1375                              parents = parents->next)
1376                                 parents->item->object.flags |= THEY_HAVE;
1377                 }
1378                 if (!we_knew_they_have)
1379                         add_object_array(o, NULL, have_obj);
1380         }
1381
1382         return 0;
1383 }
1384
1385 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1386                      const struct object_array *have_obj,
1387                      struct object_array *want_obj)
1388 {
1389         int i;
1390
1391         packet_writer_write(writer, "acknowledgments\n");
1392
1393         /* Send Acks */
1394         if (!acks->nr)
1395                 packet_writer_write(writer, "NAK\n");
1396
1397         for (i = 0; i < acks->nr; i++) {
1398                 packet_writer_write(writer, "ACK %s\n",
1399                                     oid_to_hex(&acks->oid[i]));
1400         }
1401
1402         if (ok_to_give_up(have_obj, want_obj)) {
1403                 /* Send Ready */
1404                 packet_writer_write(writer, "ready\n");
1405                 return 1;
1406         }
1407
1408         return 0;
1409 }
1410
1411 static int process_haves_and_send_acks(struct upload_pack_data *data)
1412 {
1413         struct oid_array common = OID_ARRAY_INIT;
1414         int ret = 0;
1415
1416         process_haves(&data->haves, &common, &data->have_obj);
1417         if (data->done) {
1418                 ret = 1;
1419         } else if (send_acks(&data->writer, &common,
1420                              &data->have_obj, &data->want_obj)) {
1421                 packet_writer_delim(&data->writer);
1422                 ret = 1;
1423         } else {
1424                 /* Add Flush */
1425                 packet_writer_flush(&data->writer);
1426                 ret = 0;
1427         }
1428
1429         oid_array_clear(&data->haves);
1430         oid_array_clear(&common);
1431         return ret;
1432 }
1433
1434 static void send_wanted_ref_info(struct upload_pack_data *data)
1435 {
1436         const struct string_list_item *item;
1437
1438         if (!data->wanted_refs.nr)
1439                 return;
1440
1441         packet_writer_write(&data->writer, "wanted-refs\n");
1442
1443         for_each_string_list_item(item, &data->wanted_refs) {
1444                 packet_writer_write(&data->writer, "%s %s\n",
1445                                     oid_to_hex(item->util),
1446                                     item->string);
1447         }
1448
1449         packet_writer_delim(&data->writer);
1450 }
1451
1452 static void send_shallow_info(struct upload_pack_data *data)
1453 {
1454         /* No shallow info needs to be sent */
1455         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1456             !is_repository_shallow(the_repository))
1457                 return;
1458
1459         packet_writer_write(&data->writer, "shallow-info\n");
1460
1461         if (!send_shallow_list(&data->writer, data->depth,
1462                                data->deepen_rev_list,
1463                                data->deepen_since, &data->deepen_not,
1464                                data->deepen_relative,
1465                                &data->shallows, &data->want_obj) &&
1466             is_repository_shallow(the_repository))
1467                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1468                        &data->shallows, &data->want_obj);
1469
1470         packet_delim(1);
1471 }
1472
1473 enum fetch_state {
1474         FETCH_PROCESS_ARGS = 0,
1475         FETCH_SEND_ACKS,
1476         FETCH_SEND_PACK,
1477         FETCH_DONE,
1478 };
1479
1480 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1481                    struct packet_reader *request)
1482 {
1483         enum fetch_state state = FETCH_PROCESS_ARGS;
1484         struct upload_pack_data data;
1485
1486         clear_object_flags(ALL_FLAGS);
1487
1488         git_config(upload_pack_config, NULL);
1489
1490         upload_pack_data_init(&data);
1491         use_sideband = LARGE_PACKET_MAX;
1492
1493         while (state != FETCH_DONE) {
1494                 switch (state) {
1495                 case FETCH_PROCESS_ARGS:
1496                         process_args(request, &data);
1497
1498                         if (!data.want_obj.nr) {
1499                                 /*
1500                                  * Request didn't contain any 'want' lines,
1501                                  * guess they didn't want anything.
1502                                  */
1503                                 state = FETCH_DONE;
1504                         } else if (data.haves.nr) {
1505                                 /*
1506                                  * Request had 'have' lines, so lets ACK them.
1507                                  */
1508                                 state = FETCH_SEND_ACKS;
1509                         } else {
1510                                 /*
1511                                  * Request had 'want's but no 'have's so we can
1512                                  * immedietly go to construct and send a pack.
1513                                  */
1514                                 state = FETCH_SEND_PACK;
1515                         }
1516                         break;
1517                 case FETCH_SEND_ACKS:
1518                         if (process_haves_and_send_acks(&data))
1519                                 state = FETCH_SEND_PACK;
1520                         else
1521                                 state = FETCH_DONE;
1522                         break;
1523                 case FETCH_SEND_PACK:
1524                         send_wanted_ref_info(&data);
1525                         send_shallow_info(&data);
1526
1527                         packet_writer_write(&data.writer, "packfile\n");
1528                         create_pack_file(&data.have_obj,
1529                                          &data.want_obj,
1530                                          &data.filter_options);
1531                         state = FETCH_DONE;
1532                         break;
1533                 case FETCH_DONE:
1534                         continue;
1535                 }
1536         }
1537
1538         upload_pack_data_clear(&data);
1539         return 0;
1540 }
1541
1542 int upload_pack_advertise(struct repository *r,
1543                           struct strbuf *value)
1544 {
1545         if (value) {
1546                 int allow_filter_value;
1547                 int allow_ref_in_want;
1548                 int allow_sideband_all_value;
1549
1550                 strbuf_addstr(value, "shallow");
1551
1552                 if (!repo_config_get_bool(the_repository,
1553                                          "uploadpack.allowfilter",
1554                                          &allow_filter_value) &&
1555                     allow_filter_value)
1556                         strbuf_addstr(value, " filter");
1557
1558                 if (!repo_config_get_bool(the_repository,
1559                                          "uploadpack.allowrefinwant",
1560                                          &allow_ref_in_want) &&
1561                     allow_ref_in_want)
1562                         strbuf_addstr(value, " ref-in-want");
1563
1564                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1565                     (!repo_config_get_bool(the_repository,
1566                                            "uploadpack.allowsidebandall",
1567                                            &allow_sideband_all_value) &&
1568                      allow_sideband_all_value))
1569                         strbuf_addstr(value, " sideband-all");
1570         }
1571
1572         return 1;
1573 }