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