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 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 const char *pack_objects_hook;
  66
  67 static int filter_capability_requested;
  68 static int allow_filter;
  69 static int allow_ref_in_want;
  70
  71 static int allow_sideband_all;
  72
  73 /*
  74  * Please annotate, and if possible group together, fields used only
  75  * for protocol v0 or only for protocol v2.
  76  */
  77 struct upload_pack_data {
  78         struct string_list symref;                              /* v0 only */
  79         struct object_array want_obj;
  80         struct object_array have_obj;
  81         struct oid_array haves;                                 /* v2 only */
  82         struct string_list wanted_refs;                         /* v2 only */
  83
  84         struct object_array shallows;
  85         struct string_list deepen_not;
  86         int depth;
  87         timestamp_t deepen_since;
  88         int deepen_rev_list;
  89         int deepen_relative;
  90
  91         struct list_objects_filter_options filter_options;
  92
  93         struct packet_writer writer;
  94
  95         unsigned stateless_rpc : 1;                             /* v0 only */
  96
  97         unsigned use_thin_pack : 1;
  98         unsigned use_ofs_delta : 1;
  99         unsigned no_progress : 1;
 100         unsigned use_include_tag : 1;
 101
 102         unsigned done : 1;                                      /* v2 only */
 103 };
 104
 105 static void upload_pack_data_init(struct upload_pack_data *data)
 106 {
 107         struct string_list symref = STRING_LIST_INIT_DUP;
 108         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 109         struct object_array want_obj = OBJECT_ARRAY_INIT;
 110         struct object_array have_obj = OBJECT_ARRAY_INIT;
 111         struct oid_array haves = OID_ARRAY_INIT;
 112         struct object_array shallows = OBJECT_ARRAY_INIT;
 113         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 114
 115         memset(data, 0, sizeof(*data));
 116         data->symref = symref;
 117         data->wanted_refs = wanted_refs;
 118         data->want_obj = want_obj;
 119         data->have_obj = have_obj;
 120         data->haves = haves;
 121         data->shallows = shallows;
 122         data->deepen_not = deepen_not;
 123         packet_writer_init(&data->writer, 1);
 124 }
 125
 126 static void upload_pack_data_clear(struct upload_pack_data *data)
 127 {
 128         string_list_clear(&data->symref, 1);
 129         string_list_clear(&data->wanted_refs, 1);
 130         object_array_clear(&data->want_obj);
 131         object_array_clear(&data->have_obj);
 132         oid_array_clear(&data->haves);
 133         object_array_clear(&data->shallows);
 134         string_list_clear(&data->deepen_not, 0);
 135         list_objects_filter_release(&data->filter_options);
 136 }
 137
 138 static void reset_timeout(void)
 139 {
 140         alarm(timeout);
 141 }
 142
 143 static void send_client_data(int fd, const char *data, ssize_t sz)
 144 {
 145         if (use_sideband) {
 146                 send_sideband(1, fd, data, sz, use_sideband);
 147                 return;
 148         }
 149         if (fd == 3)
 150                 /* emergency quit */
 151                 fd = 2;
 152         if (fd == 2) {
 153                 /* XXX: are we happy to lose stuff here? */
 154                 xwrite(fd, data, sz);
 155                 return;
 156         }
 157         write_or_die(fd, data, sz);
 158 }
 159
 160 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 161 {
 162         FILE *fp = cb_data;
 163         if (graft->nr_parent == -1)
 164                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 165         return 0;
 166 }
 167
 168 static void create_pack_file(struct upload_pack_data *pack_data)
 169 {
 170         struct child_process pack_objects = CHILD_PROCESS_INIT;
 171         char data[8193], progress[128];
 172         char abort_msg[] = "aborting due to possible repository "
 173                 "corruption on the remote side.";
 174         int buffered = -1;
 175         ssize_t sz;
 176         int i;
 177         FILE *pipe_fd;
 178
 179         if (!pack_objects_hook)
 180                 pack_objects.git_cmd = 1;
 181         else {
 182                 argv_array_push(&pack_objects.args, pack_objects_hook);
 183                 argv_array_push(&pack_objects.args, "git");
 184                 pack_objects.use_shell = 1;
 185         }
 186
 187         if (shallow_nr) {
 188                 argv_array_push(&pack_objects.args, "--shallow-file");
 189                 argv_array_push(&pack_objects.args, "");
 190         }
 191         argv_array_push(&pack_objects.args, "pack-objects");
 192         argv_array_push(&pack_objects.args, "--revs");
 193         if (pack_data->use_thin_pack)
 194                 argv_array_push(&pack_objects.args, "--thin");
 195
 196         argv_array_push(&pack_objects.args, "--stdout");
 197         if (shallow_nr)
 198                 argv_array_push(&pack_objects.args, "--shallow");
 199         if (!pack_data->no_progress)
 200                 argv_array_push(&pack_objects.args, "--progress");
 201         if (pack_data->use_ofs_delta)
 202                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 203         if (pack_data->use_include_tag)
 204                 argv_array_push(&pack_objects.args, "--include-tag");
 205         if (pack_data->filter_options.choice) {
 206                 const char *spec =
 207                         expand_list_objects_filter_spec(&pack_data->filter_options);
 208                 if (pack_objects.use_shell) {
 209                         struct strbuf buf = STRBUF_INIT;
 210                         sq_quote_buf(&buf, spec);
 211                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 212                         strbuf_release(&buf);
 213                 } else {
 214                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 215                                          spec);
 216                 }
 217         }
 218
 219         pack_objects.in = -1;
 220         pack_objects.out = -1;
 221         pack_objects.err = -1;
 222
 223         if (start_command(&pack_objects))
 224                 die("git upload-pack: unable to fork git-pack-objects");
 225
 226         pipe_fd = xfdopen(pack_objects.in, "w");
 227
 228         if (shallow_nr)
 229                 for_each_commit_graft(write_one_shallow, pipe_fd);
 230
 231         for (i = 0; i < pack_data->want_obj.nr; i++)
 232                 fprintf(pipe_fd, "%s\n",
 233                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 234         fprintf(pipe_fd, "--not\n");
 235         for (i = 0; i < pack_data->have_obj.nr; i++)
 236                 fprintf(pipe_fd, "%s\n",
 237                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 238         for (i = 0; i < extra_edge_obj.nr; i++)
 239                 fprintf(pipe_fd, "%s\n",
 240                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 241         fprintf(pipe_fd, "\n");
 242         fflush(pipe_fd);
 243         fclose(pipe_fd);
 244
 245         /* We read from pack_objects.err to capture stderr output for
 246          * progress bar, and pack_objects.out to capture the pack data.
 247          */
 248
 249         while (1) {
 250                 struct pollfd pfd[2];
 251                 int pe, pu, pollsize;
 252                 int ret;
 253
 254                 reset_timeout();
 255
 256                 pollsize = 0;
 257                 pe = pu = -1;
 258
 259                 if (0 <= pack_objects.out) {
 260                         pfd[pollsize].fd = pack_objects.out;
 261                         pfd[pollsize].events = POLLIN;
 262                         pu = pollsize;
 263                         pollsize++;
 264                 }
 265                 if (0 <= pack_objects.err) {
 266                         pfd[pollsize].fd = pack_objects.err;
 267                         pfd[pollsize].events = POLLIN;
 268                         pe = pollsize;
 269                         pollsize++;
 270                 }
 271
 272                 if (!pollsize)
 273                         break;
 274
 275                 ret = poll(pfd, pollsize,
 276                         keepalive < 0 ? -1 : 1000 * keepalive);
 277
 278                 if (ret < 0) {
 279                         if (errno != EINTR) {
 280                                 error_errno("poll failed, resuming");
 281                                 sleep(1);
 282                         }
 283                         continue;
 284                 }
 285                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 286                         /* Status ready; we ship that in the side-band
 287                          * or dump to the standard error.
 288                          */
 289                         sz = xread(pack_objects.err, progress,
 290                                   sizeof(progress));
 291                         if (0 < sz)
 292                                 send_client_data(2, progress, sz);
 293                         else if (sz == 0) {
 294                                 close(pack_objects.err);
 295                                 pack_objects.err = -1;
 296                         }
 297                         else
 298                                 goto fail;
 299                         /* give priority to status messages */
 300                         continue;
 301                 }
 302                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 303                         /* Data ready; we keep the last byte to ourselves
 304                          * in case we detect broken rev-list, so that we
 305                          * can leave the stream corrupted.  This is
 306                          * unfortunate -- unpack-objects would happily
 307                          * accept a valid packdata with trailing garbage,
 308                          * so appending garbage after we pass all the
 309                          * pack data is not good enough to signal
 310                          * breakage to downstream.
 311                          */
 312                         char *cp = data;
 313                         ssize_t outsz = 0;
 314                         if (0 <= buffered) {
 315                                 *cp++ = buffered;
 316                                 outsz++;
 317                         }
 318                         sz = xread(pack_objects.out, cp,
 319                                   sizeof(data) - outsz);
 320                         if (0 < sz)
 321                                 ;
 322                         else if (sz == 0) {
 323                                 close(pack_objects.out);
 324                                 pack_objects.out = -1;
 325                         }
 326                         else
 327                                 goto fail;
 328                         sz += outsz;
 329                         if (1 < sz) {
 330                                 buffered = data[sz-1] & 0xFF;
 331                                 sz--;
 332                         }
 333                         else
 334                                 buffered = -1;
 335                         send_client_data(1, data, sz);
 336                 }
 337
 338                 /*
 339                  * We hit the keepalive timeout without saying anything; send
 340                  * an empty message on the data sideband just to let the other
 341                  * side know we're still working on it, but don't have any data
 342                  * yet.
 343                  *
 344                  * If we don't have a sideband channel, there's no room in the
 345                  * protocol to say anything, so those clients are just out of
 346                  * luck.
 347                  */
 348                 if (!ret && use_sideband) {
 349                         static const char buf[] = "0005\1";
 350                         write_or_die(1, buf, 5);
 351                 }
 352         }
 353
 354         if (finish_command(&pack_objects)) {
 355                 error("git upload-pack: git-pack-objects died with error.");
 356                 goto fail;
 357         }
 358
 359         /* flush the data */
 360         if (0 <= buffered) {
 361                 data[0] = buffered;
 362                 send_client_data(1, data, 1);
 363                 fprintf(stderr, "flushed.\n");
 364         }
 365         if (use_sideband)
 366                 packet_flush(1);
 367         return;
 368
 369  fail:
 370         send_client_data(3, abort_msg, sizeof(abort_msg));
 371         die("git upload-pack: %s", abort_msg);
 372 }
 373
 374 static int got_oid(const char *hex, struct object_id *oid,
 375                    struct object_array *have_obj)
 376 {
 377         struct object *o;
 378         int we_knew_they_have = 0;
 379
 380         if (get_oid_hex(hex, oid))
 381                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 382         if (!has_object_file(oid))
 383                 return -1;
 384
 385         o = parse_object(the_repository, oid);
 386         if (!o)
 387                 die("oops (%s)", oid_to_hex(oid));
 388         if (o->type == OBJ_COMMIT) {
 389                 struct commit_list *parents;
 390                 struct commit *commit = (struct commit *)o;
 391                 if (o->flags & THEY_HAVE)
 392                         we_knew_they_have = 1;
 393                 else
 394                         o->flags |= THEY_HAVE;
 395                 if (!oldest_have || (commit->date < oldest_have))
 396                         oldest_have = commit->date;
 397                 for (parents = commit->parents;
 398                      parents;
 399                      parents = parents->next)
 400                         parents->item->object.flags |= THEY_HAVE;
 401         }
 402         if (!we_knew_they_have) {
 403                 add_object_array(o, NULL, have_obj);
 404                 return 1;
 405         }
 406         return 0;
 407 }
 408
 409 static int ok_to_give_up(const struct object_array *have_obj,
 410                          struct object_array *want_obj)
 411 {
 412         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 413
 414         if (!have_obj->nr)
 415                 return 0;
 416
 417         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 418                                             COMMON_KNOWN, oldest_have,
 419                                             min_generation);
 420 }
 421
 422 static int get_common_commits(struct upload_pack_data *data,
 423                               struct packet_reader *reader)
 424 {
 425         struct object_id oid;
 426         char last_hex[GIT_MAX_HEXSZ + 1];
 427         int got_common = 0;
 428         int got_other = 0;
 429         int sent_ready = 0;
 430
 431         save_commit_buffer = 0;
 432
 433         for (;;) {
 434                 const char *arg;
 435
 436                 reset_timeout();
 437
 438                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 439                         if (multi_ack == 2
 440                             && got_common
 441                             && !got_other
 442                             && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 443                                 sent_ready = 1;
 444                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 445                         }
 446                         if (data->have_obj.nr == 0 || multi_ack)
 447                                 packet_write_fmt(1, "NAK\n");
 448
 449                         if (no_done && sent_ready) {
 450                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 451                                 return 0;
 452                         }
 453                         if (data->stateless_rpc)
 454                                 exit(0);
 455                         got_common = 0;
 456                         got_other = 0;
 457                         continue;
 458                 }
 459                 if (skip_prefix(reader->line, "have ", &arg)) {
 460                         switch (got_oid(arg, &oid, &data->have_obj)) {
 461                         case -1: /* they have what we do not */
 462                                 got_other = 1;
 463                                 if (multi_ack
 464                                     && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 465                                         const char *hex = oid_to_hex(&oid);
 466                                         if (multi_ack == 2) {
 467                                                 sent_ready = 1;
 468                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 469                                         } else
 470                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 471                                 }
 472                                 break;
 473                         default:
 474                                 got_common = 1;
 475                                 oid_to_hex_r(last_hex, &oid);
 476                                 if (multi_ack == 2)
 477                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 478                                 else if (multi_ack)
 479                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 480                                 else if (data->have_obj.nr == 1)
 481                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 482                                 break;
 483                         }
 484                         continue;
 485                 }
 486                 if (!strcmp(reader->line, "done")) {
 487                         if (data->have_obj.nr > 0) {
 488                                 if (multi_ack)
 489                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 490                                 return 0;
 491                         }
 492                         packet_write_fmt(1, "NAK\n");
 493                         return -1;
 494                 }
 495                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 496         }
 497 }
 498
 499 static int is_our_ref(struct object *o)
 500 {
 501         int allow_hidden_ref = (allow_unadvertised_object_request &
 502                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 503         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 504 }
 505
 506 /*
 507  * on successful case, it's up to the caller to close cmd->out
 508  */
 509 static int do_reachable_revlist(struct child_process *cmd,
 510                                 struct object_array *src,
 511                                 struct object_array *reachable)
 512 {
 513         static const char *argv[] = {
 514                 "rev-list", "--stdin", NULL,
 515         };
 516         struct object *o;
 517         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 518         int i;
 519         const unsigned hexsz = the_hash_algo->hexsz;
 520
 521         cmd->argv = argv;
 522         cmd->git_cmd = 1;
 523         cmd->no_stderr = 1;
 524         cmd->in = -1;
 525         cmd->out = -1;
 526
 527         /*
 528          * If the next rev-list --stdin encounters an unknown commit,
 529          * it terminates, which will cause SIGPIPE in the write loop
 530          * below.
 531          */
 532         sigchain_push(SIGPIPE, SIG_IGN);
 533
 534         if (start_command(cmd))
 535                 goto error;
 536
 537         namebuf[0] = '^';
 538         namebuf[hexsz + 1] = '\n';
 539         for (i = get_max_object_index(); 0 < i; ) {
 540                 o = get_indexed_object(--i);
 541                 if (!o)
 542                         continue;
 543                 if (reachable && o->type == OBJ_COMMIT)
 544                         o->flags &= ~TMP_MARK;
 545                 if (!is_our_ref(o))
 546                         continue;
 547                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 548                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 549                         goto error;
 550         }
 551         namebuf[hexsz] = '\n';
 552         for (i = 0; i < src->nr; i++) {
 553                 o = src->objects[i].item;
 554                 if (is_our_ref(o)) {
 555                         if (reachable)
 556                                 add_object_array(o, NULL, reachable);
 557                         continue;
 558                 }
 559                 if (reachable && o->type == OBJ_COMMIT)
 560                         o->flags |= TMP_MARK;
 561                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 562                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 563                         goto error;
 564         }
 565         close(cmd->in);
 566         cmd->in = -1;
 567         sigchain_pop(SIGPIPE);
 568
 569         return 0;
 570
 571 error:
 572         sigchain_pop(SIGPIPE);
 573
 574         if (cmd->in >= 0)
 575                 close(cmd->in);
 576         if (cmd->out >= 0)
 577                 close(cmd->out);
 578         return -1;
 579 }
 580
 581 static int get_reachable_list(struct object_array *src,
 582                               struct object_array *reachable)
 583 {
 584         struct child_process cmd = CHILD_PROCESS_INIT;
 585         int i;
 586         struct object *o;
 587         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 588         const unsigned hexsz = the_hash_algo->hexsz;
 589
 590         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 591                 return -1;
 592
 593         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 594                 struct object_id oid;
 595                 const char *p;
 596
 597                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 598                         break;
 599
 600                 o = lookup_object(the_repository, &oid);
 601                 if (o && o->type == OBJ_COMMIT) {
 602                         o->flags &= ~TMP_MARK;
 603                 }
 604         }
 605         for (i = get_max_object_index(); 0 < i; i--) {
 606                 o = get_indexed_object(i - 1);
 607                 if (o && o->type == OBJ_COMMIT &&
 608                     (o->flags & TMP_MARK)) {
 609                         add_object_array(o, NULL, reachable);
 610                                 o->flags &= ~TMP_MARK;
 611                 }
 612         }
 613         close(cmd.out);
 614
 615         if (finish_command(&cmd))
 616                 return -1;
 617
 618         return 0;
 619 }
 620
 621 static int has_unreachable(struct object_array *src)
 622 {
 623         struct child_process cmd = CHILD_PROCESS_INIT;
 624         char buf[1];
 625         int i;
 626
 627         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 628                 return 1;
 629
 630         /*
 631          * The commits out of the rev-list are not ancestors of
 632          * our ref.
 633          */
 634         i = read_in_full(cmd.out, buf, 1);
 635         if (i)
 636                 goto error;
 637         close(cmd.out);
 638         cmd.out = -1;
 639
 640         /*
 641          * rev-list may have died by encountering a bad commit
 642          * in the history, in which case we do want to bail out
 643          * even when it showed no commit.
 644          */
 645         if (finish_command(&cmd))
 646                 goto error;
 647
 648         /* All the non-tip ones are ancestors of what we advertised */
 649         return 0;
 650
 651 error:
 652         sigchain_pop(SIGPIPE);
 653         if (cmd.out >= 0)
 654                 close(cmd.out);
 655         return 1;
 656 }
 657
 658 static void check_non_tip(struct upload_pack_data *data)
 659 {
 660         int i;
 661
 662         /*
 663          * In the normal in-process case without
 664          * uploadpack.allowReachableSHA1InWant,
 665          * non-tip requests can never happen.
 666          */
 667         if (!data->stateless_rpc
 668             && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 669                 goto error;
 670         if (!has_unreachable(&data->want_obj))
 671                 /* All the non-tip ones are ancestors of what we advertised */
 672                 return;
 673
 674 error:
 675         /* Pick one of them (we know there at least is one) */
 676         for (i = 0; i < data->want_obj.nr; i++) {
 677                 struct object *o = data->want_obj.objects[i].item;
 678                 if (!is_our_ref(o)) {
 679                         packet_writer_error(&data->writer,
 680                                             "upload-pack: not our ref %s",
 681                                             oid_to_hex(&o->oid));
 682                         die("git upload-pack: not our ref %s",
 683                             oid_to_hex(&o->oid));
 684                 }
 685         }
 686 }
 687
 688 static void send_shallow(struct packet_writer *writer,
 689                          struct commit_list *result)
 690 {
 691         while (result) {
 692                 struct object *object = &result->item->object;
 693                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 694                         packet_writer_write(writer, "shallow %s",
 695                                             oid_to_hex(&object->oid));
 696                         register_shallow(the_repository, &object->oid);
 697                         shallow_nr++;
 698                 }
 699                 result = result->next;
 700         }
 701 }
 702
 703 static void send_unshallow(struct packet_writer *writer,
 704                            const struct object_array *shallows,
 705                            struct object_array *want_obj)
 706 {
 707         int i;
 708
 709         for (i = 0; i < shallows->nr; i++) {
 710                 struct object *object = shallows->objects[i].item;
 711                 if (object->flags & NOT_SHALLOW) {
 712                         struct commit_list *parents;
 713                         packet_writer_write(writer, "unshallow %s",
 714                                             oid_to_hex(&object->oid));
 715                         object->flags &= ~CLIENT_SHALLOW;
 716                         /*
 717                          * We want to _register_ "object" as shallow, but we
 718                          * also need to traverse object's parents to deepen a
 719                          * shallow clone. Unregister it for now so we can
 720                          * parse and add the parents to the want list, then
 721                          * re-register it.
 722                          */
 723                         unregister_shallow(&object->oid);
 724                         object->parsed = 0;
 725                         parse_commit_or_die((struct commit *)object);
 726                         parents = ((struct commit *)object)->parents;
 727                         while (parents) {
 728                                 add_object_array(&parents->item->object,
 729                                                  NULL, want_obj);
 730                                 parents = parents->next;
 731                         }
 732                         add_object_array(object, NULL, &extra_edge_obj);
 733                 }
 734                 /* make sure commit traversal conforms to client */
 735                 register_shallow(the_repository, &object->oid);
 736         }
 737 }
 738
 739 static int check_ref(const char *refname_full, const struct object_id *oid,
 740                      int flag, void *cb_data);
 741 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
 742                    struct object_array *shallows, struct object_array *want_obj)
 743 {
 744         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 745                 int i;
 746
 747                 for (i = 0; i < shallows->nr; i++) {
 748                         struct object *object = shallows->objects[i].item;
 749                         object->flags |= NOT_SHALLOW;
 750                 }
 751         } else if (deepen_relative) {
 752                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 753                 struct commit_list *result;
 754
 755                 /*
 756                  * Checking for reachable shallows requires that our refs be
 757                  * marked with OUR_REF.
 758                  */
 759                 head_ref_namespaced(check_ref, NULL);
 760                 for_each_namespaced_ref(check_ref, NULL);
 761
 762                 get_reachable_list(shallows, &reachable_shallows);
 763                 result = get_shallow_commits(&reachable_shallows,
 764                                              depth + 1,
 765                                              SHALLOW, NOT_SHALLOW);
 766                 send_shallow(writer, result);
 767                 free_commit_list(result);
 768                 object_array_clear(&reachable_shallows);
 769         } else {
 770                 struct commit_list *result;
 771
 772                 result = get_shallow_commits(want_obj, depth,
 773                                              SHALLOW, NOT_SHALLOW);
 774                 send_shallow(writer, result);
 775                 free_commit_list(result);
 776         }
 777
 778         send_unshallow(writer, shallows, want_obj);
 779 }
 780
 781 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
 782                                const char **av,
 783                                struct object_array *shallows,
 784                                struct object_array *want_obj)
 785 {
 786         struct commit_list *result;
 787
 788         disable_commit_graph(the_repository);
 789         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 790         send_shallow(writer, result);
 791         free_commit_list(result);
 792         send_unshallow(writer, shallows, want_obj);
 793 }
 794
 795 /* Returns 1 if a shallow list is sent or 0 otherwise */
 796 static int send_shallow_list(struct packet_writer *writer,
 797                              int depth, int deepen_rev_list,
 798                              timestamp_t deepen_since,
 799                              struct string_list *deepen_not,
 800                              int deepen_relative,
 801                              struct object_array *shallows,
 802                              struct object_array *want_obj)
 803 {
 804         int ret = 0;
 805
 806         if (depth > 0 && deepen_rev_list)
 807                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 808         if (depth > 0) {
 809                 deepen(writer, depth, deepen_relative, shallows, want_obj);
 810                 ret = 1;
 811         } else if (deepen_rev_list) {
 812                 struct argv_array av = ARGV_ARRAY_INIT;
 813                 int i;
 814
 815                 argv_array_push(&av, "rev-list");
 816                 if (deepen_since)
 817                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 818                 if (deepen_not->nr) {
 819                         argv_array_push(&av, "--not");
 820                         for (i = 0; i < deepen_not->nr; i++) {
 821                                 struct string_list_item *s = deepen_not->items + i;
 822                                 argv_array_push(&av, s->string);
 823                         }
 824                         argv_array_push(&av, "--not");
 825                 }
 826                 for (i = 0; i < want_obj->nr; i++) {
 827                         struct object *o = want_obj->objects[i].item;
 828                         argv_array_push(&av, oid_to_hex(&o->oid));
 829                 }
 830                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
 831                 argv_array_clear(&av);
 832                 ret = 1;
 833         } else {
 834                 if (shallows->nr > 0) {
 835                         int i;
 836                         for (i = 0; i < shallows->nr; i++)
 837                                 register_shallow(the_repository,
 838                                                  &shallows->objects[i].item->oid);
 839                 }
 840         }
 841
 842         shallow_nr += shallows->nr;
 843         return ret;
 844 }
 845
 846 static int process_shallow(const char *line, struct object_array *shallows)
 847 {
 848         const char *arg;
 849         if (skip_prefix(line, "shallow ", &arg)) {
 850                 struct object_id oid;
 851                 struct object *object;
 852                 if (get_oid_hex(arg, &oid))
 853                         die("invalid shallow line: %s", line);
 854                 object = parse_object(the_repository, &oid);
 855                 if (!object)
 856                         return 1;
 857                 if (object->type != OBJ_COMMIT)
 858                         die("invalid shallow object %s", oid_to_hex(&oid));
 859                 if (!(object->flags & CLIENT_SHALLOW)) {
 860                         object->flags |= CLIENT_SHALLOW;
 861                         add_object_array(object, NULL, shallows);
 862                 }
 863                 return 1;
 864         }
 865
 866         return 0;
 867 }
 868
 869 static int process_deepen(const char *line, int *depth)
 870 {
 871         const char *arg;
 872         if (skip_prefix(line, "deepen ", &arg)) {
 873                 char *end = NULL;
 874                 *depth = (int)strtol(arg, &end, 0);
 875                 if (!end || *end || *depth <= 0)
 876                         die("Invalid deepen: %s", line);
 877                 return 1;
 878         }
 879
 880         return 0;
 881 }
 882
 883 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 884 {
 885         const char *arg;
 886         if (skip_prefix(line, "deepen-since ", &arg)) {
 887                 char *end = NULL;
 888                 *deepen_since = parse_timestamp(arg, &end, 0);
 889                 if (!end || *end || !deepen_since ||
 890                     /* revisions.c's max_age -1 is special */
 891                     *deepen_since == -1)
 892                         die("Invalid deepen-since: %s", line);
 893                 *deepen_rev_list = 1;
 894                 return 1;
 895         }
 896         return 0;
 897 }
 898
 899 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 900 {
 901         const char *arg;
 902         if (skip_prefix(line, "deepen-not ", &arg)) {
 903                 char *ref = NULL;
 904                 struct object_id oid;
 905                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 906                         die("git upload-pack: ambiguous deepen-not: %s", line);
 907                 string_list_append(deepen_not, ref);
 908                 free(ref);
 909                 *deepen_rev_list = 1;
 910                 return 1;
 911         }
 912         return 0;
 913 }
 914
 915 static void receive_needs(struct upload_pack_data *data,
 916                           struct packet_reader *reader)
 917 {
 918         int has_non_tip = 0;
 919
 920         shallow_nr = 0;
 921         for (;;) {
 922                 struct object *o;
 923                 const char *features;
 924                 struct object_id oid_buf;
 925                 const char *arg;
 926
 927                 reset_timeout();
 928                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 929                         break;
 930
 931                 if (process_shallow(reader->line, &data->shallows))
 932                         continue;
 933                 if (process_deepen(reader->line, &data->depth))
 934                         continue;
 935                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
 936                         continue;
 937                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
 938                         continue;
 939
 940                 if (skip_prefix(reader->line, "filter ", &arg)) {
 941                         if (!filter_capability_requested)
 942                                 die("git upload-pack: filtering capability not negotiated");
 943                         list_objects_filter_die_if_populated(&data->filter_options);
 944                         parse_list_objects_filter(&data->filter_options, arg);
 945                         continue;
 946                 }
 947
 948                 if (!skip_prefix(reader->line, "want ", &arg) ||
 949                     parse_oid_hex(arg, &oid_buf, &features))
 950                         die("git upload-pack: protocol error, "
 951                             "expected to get object ID, not '%s'", reader->line);
 952
 953                 if (parse_feature_request(features, "deepen-relative"))
 954                         data->deepen_relative = 1;
 955                 if (parse_feature_request(features, "multi_ack_detailed"))
 956                         multi_ack = 2;
 957                 else if (parse_feature_request(features, "multi_ack"))
 958                         multi_ack = 1;
 959                 if (parse_feature_request(features, "no-done"))
 960                         no_done = 1;
 961                 if (parse_feature_request(features, "thin-pack"))
 962                         data->use_thin_pack = 1;
 963                 if (parse_feature_request(features, "ofs-delta"))
 964                         data->use_ofs_delta = 1;
 965                 if (parse_feature_request(features, "side-band-64k"))
 966                         use_sideband = LARGE_PACKET_MAX;
 967                 else if (parse_feature_request(features, "side-band"))
 968                         use_sideband = DEFAULT_PACKET_MAX;
 969                 if (parse_feature_request(features, "no-progress"))
 970                         data->no_progress = 1;
 971                 if (parse_feature_request(features, "include-tag"))
 972                         data->use_include_tag = 1;
 973                 if (allow_filter && parse_feature_request(features, "filter"))
 974                         filter_capability_requested = 1;
 975
 976                 o = parse_object(the_repository, &oid_buf);
 977                 if (!o) {
 978                         packet_writer_error(&data->writer,
 979                                             "upload-pack: not our ref %s",
 980                                             oid_to_hex(&oid_buf));
 981                         die("git upload-pack: not our ref %s",
 982                             oid_to_hex(&oid_buf));
 983                 }
 984                 if (!(o->flags & WANTED)) {
 985                         o->flags |= WANTED;
 986                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 987                               || is_our_ref(o)))
 988                                 has_non_tip = 1;
 989                         add_object_array(o, NULL, &data->want_obj);
 990                 }
 991         }
 992
 993         /*
 994          * We have sent all our refs already, and the other end
 995          * should have chosen out of them. When we are operating
 996          * in the stateless RPC mode, however, their choice may
 997          * have been based on the set of older refs advertised
 998          * by another process that handled the initial request.
 999          */
1000         if (has_non_tip)
1001                 check_non_tip(data);
1002
1003         if (!use_sideband && daemon_mode)
1004                 data->no_progress = 1;
1005
1006         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1007                 return;
1008
1009         if (send_shallow_list(&data->writer,
1010                               data->depth,
1011                               data->deepen_rev_list,
1012                               data->deepen_since,
1013                               &data->deepen_not,
1014                               data->deepen_relative,
1015                               &data->shallows,
1016                               &data->want_obj))
1017                 packet_flush(1);
1018 }
1019
1020 /* return non-zero if the ref is hidden, otherwise 0 */
1021 static int mark_our_ref(const char *refname, const char *refname_full,
1022                         const struct object_id *oid)
1023 {
1024         struct object *o = lookup_unknown_object(oid);
1025
1026         if (ref_is_hidden(refname, refname_full)) {
1027                 o->flags |= HIDDEN_REF;
1028                 return 1;
1029         }
1030         o->flags |= OUR_REF;
1031         return 0;
1032 }
1033
1034 static int check_ref(const char *refname_full, const struct object_id *oid,
1035                      int flag, void *cb_data)
1036 {
1037         const char *refname = strip_namespace(refname_full);
1038
1039         mark_our_ref(refname, refname_full, oid);
1040         return 0;
1041 }
1042
1043 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1044 {
1045         struct string_list_item *item;
1046
1047         if (!symref->nr)
1048                 return;
1049         for_each_string_list_item(item, symref)
1050                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1051 }
1052
1053 static int send_ref(const char *refname, const struct object_id *oid,
1054                     int flag, void *cb_data)
1055 {
1056         static const char *capabilities = "multi_ack thin-pack side-band"
1057                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1058                 " deepen-relative no-progress include-tag multi_ack_detailed";
1059         const char *refname_nons = strip_namespace(refname);
1060         struct object_id peeled;
1061         struct upload_pack_data *data = cb_data;
1062
1063         if (mark_our_ref(refname_nons, refname, oid))
1064                 return 0;
1065
1066         if (capabilities) {
1067                 struct strbuf symref_info = STRBUF_INIT;
1068
1069                 format_symref_info(&symref_info, &data->symref);
1070                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1071                              oid_to_hex(oid), refname_nons,
1072                              0, capabilities,
1073                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1074                                      " allow-tip-sha1-in-want" : "",
1075                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1076                                      " allow-reachable-sha1-in-want" : "",
1077                              data->stateless_rpc ? " no-done" : "",
1078                              symref_info.buf,
1079                              allow_filter ? " filter" : "",
1080                              git_user_agent_sanitized());
1081                 strbuf_release(&symref_info);
1082         } else {
1083                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1084         }
1085         capabilities = NULL;
1086         if (!peel_ref(refname, &peeled))
1087                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1088         return 0;
1089 }
1090
1091 static int find_symref(const char *refname, const struct object_id *oid,
1092                        int flag, void *cb_data)
1093 {
1094         const char *symref_target;
1095         struct string_list_item *item;
1096
1097         if ((flag & REF_ISSYMREF) == 0)
1098                 return 0;
1099         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1100         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1101                 die("'%s' is a symref but it is not?", refname);
1102         item = string_list_append(cb_data, strip_namespace(refname));
1103         item->util = xstrdup(strip_namespace(symref_target));
1104         return 0;
1105 }
1106
1107 static int upload_pack_config(const char *var, const char *value, void *unused)
1108 {
1109         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1110                 if (git_config_bool(var, value))
1111                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1112                 else
1113                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1114         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1115                 if (git_config_bool(var, value))
1116                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1117                 else
1118                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1119         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1120                 if (git_config_bool(var, value))
1121                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1122                 else
1123                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1124         } else if (!strcmp("uploadpack.keepalive", var)) {
1125                 keepalive = git_config_int(var, value);
1126                 if (!keepalive)
1127                         keepalive = -1;
1128         } else if (!strcmp("uploadpack.allowfilter", var)) {
1129                 allow_filter = git_config_bool(var, value);
1130         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1131                 allow_ref_in_want = git_config_bool(var, value);
1132         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1133                 allow_sideband_all = git_config_bool(var, value);
1134         } else if (!strcmp("core.precomposeunicode", var)) {
1135                 precomposed_unicode = git_config_bool(var, value);
1136         }
1137
1138         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1139         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1140                 if (!strcmp("uploadpack.packobjectshook", var))
1141                         return git_config_string(&pack_objects_hook, var, value);
1142         }
1143
1144         return parse_hide_refs_config(var, value, "uploadpack");
1145 }
1146
1147 void upload_pack(struct upload_pack_options *options)
1148 {
1149         struct packet_reader reader;
1150         struct upload_pack_data data;
1151
1152         timeout = options->timeout;
1153         daemon_mode = options->daemon_mode;
1154
1155         git_config(upload_pack_config, NULL);
1156
1157         upload_pack_data_init(&data);
1158
1159         data.stateless_rpc = options->stateless_rpc;
1160
1161         head_ref_namespaced(find_symref, &data.symref);
1162
1163         if (options->advertise_refs || !data.stateless_rpc) {
1164                 reset_timeout();
1165                 head_ref_namespaced(send_ref, &data);
1166                 for_each_namespaced_ref(send_ref, &data);
1167                 advertise_shallow_grafts(1);
1168                 packet_flush(1);
1169         } else {
1170                 head_ref_namespaced(check_ref, NULL);
1171                 for_each_namespaced_ref(check_ref, NULL);
1172         }
1173
1174         if (!options->advertise_refs) {
1175                 packet_reader_init(&reader, 0, NULL, 0,
1176                                    PACKET_READ_CHOMP_NEWLINE |
1177                                    PACKET_READ_DIE_ON_ERR_PACKET);
1178
1179                 receive_needs(&data, &reader);
1180                 if (data.want_obj.nr) {
1181                         get_common_commits(&data, &reader);
1182                         create_pack_file(&data);
1183                 }
1184         }
1185
1186         upload_pack_data_clear(&data);
1187 }
1188
1189 static int parse_want(struct packet_writer *writer, const char *line,
1190                       struct object_array *want_obj)
1191 {
1192         const char *arg;
1193         if (skip_prefix(line, "want ", &arg)) {
1194                 struct object_id oid;
1195                 struct object *o;
1196
1197                 if (get_oid_hex(arg, &oid))
1198                         die("git upload-pack: protocol error, "
1199                             "expected to get oid, not '%s'", line);
1200
1201                 o = parse_object(the_repository, &oid);
1202                 if (!o) {
1203                         packet_writer_error(writer,
1204                                             "upload-pack: not our ref %s",
1205                                             oid_to_hex(&oid));
1206                         die("git upload-pack: not our ref %s",
1207                             oid_to_hex(&oid));
1208                 }
1209
1210                 if (!(o->flags & WANTED)) {
1211                         o->flags |= WANTED;
1212                         add_object_array(o, NULL, want_obj);
1213                 }
1214
1215                 return 1;
1216         }
1217
1218         return 0;
1219 }
1220
1221 static int parse_want_ref(struct packet_writer *writer, const char *line,
1222                           struct string_list *wanted_refs,
1223                           struct object_array *want_obj)
1224 {
1225         const char *arg;
1226         if (skip_prefix(line, "want-ref ", &arg)) {
1227                 struct object_id oid;
1228                 struct string_list_item *item;
1229                 struct object *o;
1230
1231                 if (read_ref(arg, &oid)) {
1232                         packet_writer_error(writer, "unknown ref %s", arg);
1233                         die("unknown ref %s", arg);
1234                 }
1235
1236                 item = string_list_append(wanted_refs, arg);
1237                 item->util = oiddup(&oid);
1238
1239                 o = parse_object_or_die(&oid, arg);
1240                 if (!(o->flags & WANTED)) {
1241                         o->flags |= WANTED;
1242                         add_object_array(o, NULL, want_obj);
1243                 }
1244
1245                 return 1;
1246         }
1247
1248         return 0;
1249 }
1250
1251 static int parse_have(const char *line, struct oid_array *haves)
1252 {
1253         const char *arg;
1254         if (skip_prefix(line, "have ", &arg)) {
1255                 struct object_id oid;
1256
1257                 if (get_oid_hex(arg, &oid))
1258                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1259                 oid_array_append(haves, &oid);
1260                 return 1;
1261         }
1262
1263         return 0;
1264 }
1265
1266 static void process_args(struct packet_reader *request,
1267                          struct upload_pack_data *data)
1268 {
1269         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1270                 const char *arg = request->line;
1271                 const char *p;
1272
1273                 /* process want */
1274                 if (parse_want(&data->writer, arg, &data->want_obj))
1275                         continue;
1276                 if (allow_ref_in_want &&
1277                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1278                                    &data->want_obj))
1279                         continue;
1280                 /* process have line */
1281                 if (parse_have(arg, &data->haves))
1282                         continue;
1283
1284                 /* process args like thin-pack */
1285                 if (!strcmp(arg, "thin-pack")) {
1286                         data->use_thin_pack = 1;
1287                         continue;
1288                 }
1289                 if (!strcmp(arg, "ofs-delta")) {
1290                         data->use_ofs_delta = 1;
1291                         continue;
1292                 }
1293                 if (!strcmp(arg, "no-progress")) {
1294                         data->no_progress = 1;
1295                         continue;
1296                 }
1297                 if (!strcmp(arg, "include-tag")) {
1298                         data->use_include_tag = 1;
1299                         continue;
1300                 }
1301                 if (!strcmp(arg, "done")) {
1302                         data->done = 1;
1303                         continue;
1304                 }
1305
1306                 /* Shallow related arguments */
1307                 if (process_shallow(arg, &data->shallows))
1308                         continue;
1309                 if (process_deepen(arg, &data->depth))
1310                         continue;
1311                 if (process_deepen_since(arg, &data->deepen_since,
1312                                          &data->deepen_rev_list))
1313                         continue;
1314                 if (process_deepen_not(arg, &data->deepen_not,
1315                                        &data->deepen_rev_list))
1316                         continue;
1317                 if (!strcmp(arg, "deepen-relative")) {
1318                         data->deepen_relative = 1;
1319                         continue;
1320                 }
1321
1322                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1323                         list_objects_filter_die_if_populated(&data->filter_options);
1324                         parse_list_objects_filter(&data->filter_options, p);
1325                         continue;
1326                 }
1327
1328                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1329                      allow_sideband_all) &&
1330                     !strcmp(arg, "sideband-all")) {
1331                         data->writer.use_sideband = 1;
1332                         continue;
1333                 }
1334
1335                 /* ignore unknown lines maybe? */
1336                 die("unexpected line: '%s'", arg);
1337         }
1338
1339         if (request->status != PACKET_READ_FLUSH)
1340                 die(_("expected flush after fetch arguments"));
1341 }
1342
1343 static int process_haves(struct oid_array *haves, struct oid_array *common,
1344                          struct object_array *have_obj)
1345 {
1346         int i;
1347
1348         /* Process haves */
1349         for (i = 0; i < haves->nr; i++) {
1350                 const struct object_id *oid = &haves->oid[i];
1351                 struct object *o;
1352                 int we_knew_they_have = 0;
1353
1354                 if (!has_object_file(oid))
1355                         continue;
1356
1357                 oid_array_append(common, oid);
1358
1359                 o = parse_object(the_repository, oid);
1360                 if (!o)
1361                         die("oops (%s)", oid_to_hex(oid));
1362                 if (o->type == OBJ_COMMIT) {
1363                         struct commit_list *parents;
1364                         struct commit *commit = (struct commit *)o;
1365                         if (o->flags & THEY_HAVE)
1366                                 we_knew_they_have = 1;
1367                         else
1368                                 o->flags |= THEY_HAVE;
1369                         if (!oldest_have || (commit->date < oldest_have))
1370                                 oldest_have = commit->date;
1371                         for (parents = commit->parents;
1372                              parents;
1373                              parents = parents->next)
1374                                 parents->item->object.flags |= THEY_HAVE;
1375                 }
1376                 if (!we_knew_they_have)
1377                         add_object_array(o, NULL, have_obj);
1378         }
1379
1380         return 0;
1381 }
1382
1383 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1384                      const struct object_array *have_obj,
1385                      struct object_array *want_obj)
1386 {
1387         int i;
1388
1389         packet_writer_write(writer, "acknowledgments\n");
1390
1391         /* Send Acks */
1392         if (!acks->nr)
1393                 packet_writer_write(writer, "NAK\n");
1394
1395         for (i = 0; i < acks->nr; i++) {
1396                 packet_writer_write(writer, "ACK %s\n",
1397                                     oid_to_hex(&acks->oid[i]));
1398         }
1399
1400         if (ok_to_give_up(have_obj, want_obj)) {
1401                 /* Send Ready */
1402                 packet_writer_write(writer, "ready\n");
1403                 return 1;
1404         }
1405
1406         return 0;
1407 }
1408
1409 static int process_haves_and_send_acks(struct upload_pack_data *data)
1410 {
1411         struct oid_array common = OID_ARRAY_INIT;
1412         int ret = 0;
1413
1414         process_haves(&data->haves, &common, &data->have_obj);
1415         if (data->done) {
1416                 ret = 1;
1417         } else if (send_acks(&data->writer, &common,
1418                              &data->have_obj, &data->want_obj)) {
1419                 packet_writer_delim(&data->writer);
1420                 ret = 1;
1421         } else {
1422                 /* Add Flush */
1423                 packet_writer_flush(&data->writer);
1424                 ret = 0;
1425         }
1426
1427         oid_array_clear(&data->haves);
1428         oid_array_clear(&common);
1429         return ret;
1430 }
1431
1432 static void send_wanted_ref_info(struct upload_pack_data *data)
1433 {
1434         const struct string_list_item *item;
1435
1436         if (!data->wanted_refs.nr)
1437                 return;
1438
1439         packet_writer_write(&data->writer, "wanted-refs\n");
1440
1441         for_each_string_list_item(item, &data->wanted_refs) {
1442                 packet_writer_write(&data->writer, "%s %s\n",
1443                                     oid_to_hex(item->util),
1444                                     item->string);
1445         }
1446
1447         packet_writer_delim(&data->writer);
1448 }
1449
1450 static void send_shallow_info(struct upload_pack_data *data)
1451 {
1452         /* No shallow info needs to be sent */
1453         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1454             !is_repository_shallow(the_repository))
1455                 return;
1456
1457         packet_writer_write(&data->writer, "shallow-info\n");
1458
1459         if (!send_shallow_list(&data->writer, data->depth,
1460                                data->deepen_rev_list,
1461                                data->deepen_since, &data->deepen_not,
1462                                data->deepen_relative,
1463                                &data->shallows, &data->want_obj) &&
1464             is_repository_shallow(the_repository))
1465                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1466                        &data->shallows, &data->want_obj);
1467
1468         packet_delim(1);
1469 }
1470
1471 enum fetch_state {
1472         FETCH_PROCESS_ARGS = 0,
1473         FETCH_SEND_ACKS,
1474         FETCH_SEND_PACK,
1475         FETCH_DONE,
1476 };
1477
1478 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1479                    struct packet_reader *request)
1480 {
1481         enum fetch_state state = FETCH_PROCESS_ARGS;
1482         struct upload_pack_data data;
1483
1484         clear_object_flags(ALL_FLAGS);
1485
1486         git_config(upload_pack_config, NULL);
1487
1488         upload_pack_data_init(&data);
1489         use_sideband = LARGE_PACKET_MAX;
1490
1491         while (state != FETCH_DONE) {
1492                 switch (state) {
1493                 case FETCH_PROCESS_ARGS:
1494                         process_args(request, &data);
1495
1496                         if (!data.want_obj.nr) {
1497                                 /*
1498                                  * Request didn't contain any 'want' lines,
1499                                  * guess they didn't want anything.
1500                                  */
1501                                 state = FETCH_DONE;
1502                         } else if (data.haves.nr) {
1503                                 /*
1504                                  * Request had 'have' lines, so lets ACK them.
1505                                  */
1506                                 state = FETCH_SEND_ACKS;
1507                         } else {
1508                                 /*
1509                                  * Request had 'want's but no 'have's so we can
1510                                  * immedietly go to construct and send a pack.
1511                                  */
1512                                 state = FETCH_SEND_PACK;
1513                         }
1514                         break;
1515                 case FETCH_SEND_ACKS:
1516                         if (process_haves_and_send_acks(&data))
1517                                 state = FETCH_SEND_PACK;
1518                         else
1519                                 state = FETCH_DONE;
1520                         break;
1521                 case FETCH_SEND_PACK:
1522                         send_wanted_ref_info(&data);
1523                         send_shallow_info(&data);
1524
1525                         packet_writer_write(&data.writer, "packfile\n");
1526                         create_pack_file(&data);
1527                         state = FETCH_DONE;
1528                         break;
1529                 case FETCH_DONE:
1530                         continue;
1531                 }
1532         }
1533
1534         upload_pack_data_clear(&data);
1535         return 0;
1536 }
1537
1538 int upload_pack_advertise(struct repository *r,
1539                           struct strbuf *value)
1540 {
1541         if (value) {
1542                 int allow_filter_value;
1543                 int allow_ref_in_want;
1544                 int allow_sideband_all_value;
1545
1546                 strbuf_addstr(value, "shallow");
1547
1548                 if (!repo_config_get_bool(the_repository,
1549                                          "uploadpack.allowfilter",
1550                                          &allow_filter_value) &&
1551                     allow_filter_value)
1552                         strbuf_addstr(value, " filter");
1553
1554                 if (!repo_config_get_bool(the_repository,
1555                                          "uploadpack.allowrefinwant",
1556                                          &allow_ref_in_want) &&
1557                     allow_ref_in_want)
1558                         strbuf_addstr(value, " ref-in-want");
1559
1560                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1561                     (!repo_config_get_bool(the_repository,
1562                                            "uploadpack.allowsidebandall",
1563                                            &allow_sideband_all_value) &&
1564                      allow_sideband_all_value))
1565                         strbuf_addstr(value, " sideband-all");
1566         }
1567
1568         return 1;
1569 }