upload-pack.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "pkt-line.h"
   4 #include "sideband.h"
   5 #include "tag.h"
   6 #include "object.h"
   7 #include "commit.h"
   8 #include "exec_cmd.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "list-objects.h"
  12 #include "run-command.h"
  13 #include "sigchain.h"
  14 #include "version.h"
  15 #include "string-list.h"
  16
  17 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  18
  19 /* bits #0..7 in revision.h, #8..10 in commit.c */
  20 #define THEY_HAVE       (1u << 11)
  21 #define OUR_REF         (1u << 12)
  22 #define WANTED          (1u << 13)
  23 #define COMMON_KNOWN    (1u << 14)
  24 #define REACHABLE       (1u << 15)
  25
  26 #define SHALLOW         (1u << 16)
  27 #define NOT_SHALLOW     (1u << 17)
  28 #define CLIENT_SHALLOW  (1u << 18)
  29 #define HIDDEN_REF      (1u << 19)
  30
  31 static unsigned long oldest_have;
  32
  33 static int multi_ack;
  34 static int no_done;
  35 static int use_thin_pack, use_ofs_delta, use_include_tag;
  36 static int no_progress, daemon_mode;
  37 static int allow_tip_sha1_in_want;
  38 static int shallow_nr;
  39 static struct object_array have_obj;
  40 static struct object_array want_obj;
  41 static struct object_array extra_edge_obj;
  42 static unsigned int timeout;
  43 /* 0 for no sideband,
  44  * otherwise maximum packet size (up to 65520 bytes).
  45  */
  46 static int use_sideband;
  47 static int advertise_refs;
  48 static int stateless_rpc;
  49
  50 static void reset_timeout(void)
  51 {
  52         alarm(timeout);
  53 }
  54
  55 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  56 {
  57         if (use_sideband)
  58                 return send_sideband(1, fd, data, sz, use_sideband);
  59         if (fd == 3)
  60                 /* emergency quit */
  61                 fd = 2;
  62         if (fd == 2) {
  63                 /* XXX: are we happy to lose stuff here? */
  64                 xwrite(fd, data, sz);
  65                 return sz;
  66         }
  67         write_or_die(fd, data, sz);
  68         return sz;
  69 }
  70
  71 static FILE *pack_pipe = NULL;
  72 static void show_commit(struct commit *commit, void *data)
  73 {
  74         if (commit->object.flags & BOUNDARY)
  75                 fputc('-', pack_pipe);
  76         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
  77                 die("broken output pipe");
  78         fputc('\n', pack_pipe);
  79         fflush(pack_pipe);
  80         free(commit->buffer);
  81         commit->buffer = NULL;
  82 }
  83
  84 static void show_object(struct object *obj,
  85                         const struct name_path *path, const char *component,
  86                         void *cb_data)
  87 {
  88         show_object_with_name(pack_pipe, obj, path, component);
  89 }
  90
  91 static void show_edge(struct commit *commit)
  92 {
  93         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
  94 }
  95
  96 static int do_rev_list(int in, int out, void *user_data)
  97 {
  98         int i;
  99         struct rev_info revs;
 100
 101         pack_pipe = xfdopen(out, "w");
 102         init_revisions(&revs, NULL);
 103         revs.tag_objects = 1;
 104         revs.tree_objects = 1;
 105         revs.blob_objects = 1;
 106         if (use_thin_pack)
 107                 revs.edge_hint = 1;
 108
 109         for (i = 0; i < want_obj.nr; i++) {
 110                 struct object *o = want_obj.objects[i].item;
 111                 /* why??? */
 112                 o->flags &= ~UNINTERESTING;
 113                 add_pending_object(&revs, o, NULL);
 114         }
 115         for (i = 0; i < have_obj.nr; i++) {
 116                 struct object *o = have_obj.objects[i].item;
 117                 o->flags |= UNINTERESTING;
 118                 add_pending_object(&revs, o, NULL);
 119         }
 120         setup_revisions(0, NULL, &revs, NULL);
 121         if (prepare_revision_walk(&revs))
 122                 die("revision walk setup failed");
 123         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 124         if (use_thin_pack)
 125                 for (i = 0; i < extra_edge_obj.nr; i++)
 126                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
 127                                         extra_edge_obj.objects[i].item->sha1));
 128         traverse_commit_list(&revs, show_commit, show_object, NULL);
 129         fflush(pack_pipe);
 130         fclose(pack_pipe);
 131         return 0;
 132 }
 133
 134 static void create_pack_file(void)
 135 {
 136         struct async rev_list;
 137         struct child_process pack_objects;
 138         char data[8193], progress[128];
 139         char abort_msg[] = "aborting due to possible repository "
 140                 "corruption on the remote side.";
 141         int buffered = -1;
 142         ssize_t sz;
 143         const char *argv[10];
 144         int arg = 0;
 145
 146         argv[arg++] = "pack-objects";
 147         if (!shallow_nr) {
 148                 argv[arg++] = "--revs";
 149                 if (use_thin_pack)
 150                         argv[arg++] = "--thin";
 151         }
 152
 153         argv[arg++] = "--stdout";
 154         if (!no_progress)
 155                 argv[arg++] = "--progress";
 156         if (use_ofs_delta)
 157                 argv[arg++] = "--delta-base-offset";
 158         if (use_include_tag)
 159                 argv[arg++] = "--include-tag";
 160         argv[arg++] = NULL;
 161
 162         memset(&pack_objects, 0, sizeof(pack_objects));
 163         pack_objects.in = -1;
 164         pack_objects.out = -1;
 165         pack_objects.err = -1;
 166         pack_objects.git_cmd = 1;
 167         pack_objects.argv = argv;
 168
 169         if (start_command(&pack_objects))
 170                 die("git upload-pack: unable to fork git-pack-objects");
 171
 172         if (shallow_nr) {
 173                 memset(&rev_list, 0, sizeof(rev_list));
 174                 rev_list.proc = do_rev_list;
 175                 rev_list.out = pack_objects.in;
 176                 if (start_async(&rev_list))
 177                         die("git upload-pack: unable to fork git-rev-list");
 178         }
 179         else {
 180                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
 181                 int i;
 182
 183                 for (i = 0; i < want_obj.nr; i++)
 184                         fprintf(pipe_fd, "%s\n",
 185                                 sha1_to_hex(want_obj.objects[i].item->sha1));
 186                 fprintf(pipe_fd, "--not\n");
 187                 for (i = 0; i < have_obj.nr; i++)
 188                         fprintf(pipe_fd, "%s\n",
 189                                 sha1_to_hex(have_obj.objects[i].item->sha1));
 190                 fprintf(pipe_fd, "\n");
 191                 fflush(pipe_fd);
 192                 fclose(pipe_fd);
 193         }
 194
 195
 196         /* We read from pack_objects.err to capture stderr output for
 197          * progress bar, and pack_objects.out to capture the pack data.
 198          */
 199
 200         while (1) {
 201                 struct pollfd pfd[2];
 202                 int pe, pu, pollsize;
 203
 204                 reset_timeout();
 205
 206                 pollsize = 0;
 207                 pe = pu = -1;
 208
 209                 if (0 <= pack_objects.out) {
 210                         pfd[pollsize].fd = pack_objects.out;
 211                         pfd[pollsize].events = POLLIN;
 212                         pu = pollsize;
 213                         pollsize++;
 214                 }
 215                 if (0 <= pack_objects.err) {
 216                         pfd[pollsize].fd = pack_objects.err;
 217                         pfd[pollsize].events = POLLIN;
 218                         pe = pollsize;
 219                         pollsize++;
 220                 }
 221
 222                 if (!pollsize)
 223                         break;
 224
 225                 if (poll(pfd, pollsize, -1) < 0) {
 226                         if (errno != EINTR) {
 227                                 error("poll failed, resuming: %s",
 228                                       strerror(errno));
 229                                 sleep(1);
 230                         }
 231                         continue;
 232                 }
 233                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 234                         /* Status ready; we ship that in the side-band
 235                          * or dump to the standard error.
 236                          */
 237                         sz = xread(pack_objects.err, progress,
 238                                   sizeof(progress));
 239                         if (0 < sz)
 240                                 send_client_data(2, progress, sz);
 241                         else if (sz == 0) {
 242                                 close(pack_objects.err);
 243                                 pack_objects.err = -1;
 244                         }
 245                         else
 246                                 goto fail;
 247                         /* give priority to status messages */
 248                         continue;
 249                 }
 250                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 251                         /* Data ready; we keep the last byte to ourselves
 252                          * in case we detect broken rev-list, so that we
 253                          * can leave the stream corrupted.  This is
 254                          * unfortunate -- unpack-objects would happily
 255                          * accept a valid packdata with trailing garbage,
 256                          * so appending garbage after we pass all the
 257                          * pack data is not good enough to signal
 258                          * breakage to downstream.
 259                          */
 260                         char *cp = data;
 261                         ssize_t outsz = 0;
 262                         if (0 <= buffered) {
 263                                 *cp++ = buffered;
 264                                 outsz++;
 265                         }
 266                         sz = xread(pack_objects.out, cp,
 267                                   sizeof(data) - outsz);
 268                         if (0 < sz)
 269                                 ;
 270                         else if (sz == 0) {
 271                                 close(pack_objects.out);
 272                                 pack_objects.out = -1;
 273                         }
 274                         else
 275                                 goto fail;
 276                         sz += outsz;
 277                         if (1 < sz) {
 278                                 buffered = data[sz-1] & 0xFF;
 279                                 sz--;
 280                         }
 281                         else
 282                                 buffered = -1;
 283                         sz = send_client_data(1, data, sz);
 284                         if (sz < 0)
 285                                 goto fail;
 286                 }
 287         }
 288
 289         if (finish_command(&pack_objects)) {
 290                 error("git upload-pack: git-pack-objects died with error.");
 291                 goto fail;
 292         }
 293         if (shallow_nr && finish_async(&rev_list))
 294                 goto fail;      /* error was already reported */
 295
 296         /* flush the data */
 297         if (0 <= buffered) {
 298                 data[0] = buffered;
 299                 sz = send_client_data(1, data, 1);
 300                 if (sz < 0)
 301                         goto fail;
 302                 fprintf(stderr, "flushed.\n");
 303         }
 304         if (use_sideband)
 305                 packet_flush(1);
 306         return;
 307
 308  fail:
 309         send_client_data(3, abort_msg, sizeof(abort_msg));
 310         die("git upload-pack: %s", abort_msg);
 311 }
 312
 313 static int got_sha1(char *hex, unsigned char *sha1)
 314 {
 315         struct object *o;
 316         int we_knew_they_have = 0;
 317
 318         if (get_sha1_hex(hex, sha1))
 319                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 320         if (!has_sha1_file(sha1))
 321                 return -1;
 322
 323         o = parse_object(sha1);
 324         if (!o)
 325                 die("oops (%s)", sha1_to_hex(sha1));
 326         if (o->type == OBJ_COMMIT) {
 327                 struct commit_list *parents;
 328                 struct commit *commit = (struct commit *)o;
 329                 if (o->flags & THEY_HAVE)
 330                         we_knew_they_have = 1;
 331                 else
 332                         o->flags |= THEY_HAVE;
 333                 if (!oldest_have || (commit->date < oldest_have))
 334                         oldest_have = commit->date;
 335                 for (parents = commit->parents;
 336                      parents;
 337                      parents = parents->next)
 338                         parents->item->object.flags |= THEY_HAVE;
 339         }
 340         if (!we_knew_they_have) {
 341                 add_object_array(o, NULL, &have_obj);
 342                 return 1;
 343         }
 344         return 0;
 345 }
 346
 347 static int reachable(struct commit *want)
 348 {
 349         struct commit_list *work = NULL;
 350
 351         commit_list_insert_by_date(want, &work);
 352         while (work) {
 353                 struct commit_list *list = work->next;
 354                 struct commit *commit = work->item;
 355                 free(work);
 356                 work = list;
 357
 358                 if (commit->object.flags & THEY_HAVE) {
 359                         want->object.flags |= COMMON_KNOWN;
 360                         break;
 361                 }
 362                 if (!commit->object.parsed)
 363                         parse_object(commit->object.sha1);
 364                 if (commit->object.flags & REACHABLE)
 365                         continue;
 366                 commit->object.flags |= REACHABLE;
 367                 if (commit->date < oldest_have)
 368                         continue;
 369                 for (list = commit->parents; list; list = list->next) {
 370                         struct commit *parent = list->item;
 371                         if (!(parent->object.flags & REACHABLE))
 372                                 commit_list_insert_by_date(parent, &work);
 373                 }
 374         }
 375         want->object.flags |= REACHABLE;
 376         clear_commit_marks(want, REACHABLE);
 377         free_commit_list(work);
 378         return (want->object.flags & COMMON_KNOWN);
 379 }
 380
 381 static int ok_to_give_up(void)
 382 {
 383         int i;
 384
 385         if (!have_obj.nr)
 386                 return 0;
 387
 388         for (i = 0; i < want_obj.nr; i++) {
 389                 struct object *want = want_obj.objects[i].item;
 390
 391                 if (want->flags & COMMON_KNOWN)
 392                         continue;
 393                 want = deref_tag(want, "a want line", 0);
 394                 if (!want || want->type != OBJ_COMMIT) {
 395                         /* no way to tell if this is reachable by
 396                          * looking at the ancestry chain alone, so
 397                          * leave a note to ourselves not to worry about
 398                          * this object anymore.
 399                          */
 400                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 401                         continue;
 402                 }
 403                 if (!reachable((struct commit *)want))
 404                         return 0;
 405         }
 406         return 1;
 407 }
 408
 409 static int get_common_commits(void)
 410 {
 411         unsigned char sha1[20];
 412         char last_hex[41];
 413         int got_common = 0;
 414         int got_other = 0;
 415         int sent_ready = 0;
 416
 417         save_commit_buffer = 0;
 418
 419         for (;;) {
 420                 char *line = packet_read_line(0, NULL);
 421                 reset_timeout();
 422
 423                 if (!line) {
 424                         if (multi_ack == 2 && got_common
 425                             && !got_other && ok_to_give_up()) {
 426                                 sent_ready = 1;
 427                                 packet_write(1, "ACK %s ready\n", last_hex);
 428                         }
 429                         if (have_obj.nr == 0 || multi_ack)
 430                                 packet_write(1, "NAK\n");
 431
 432                         if (no_done && sent_ready) {
 433                                 packet_write(1, "ACK %s\n", last_hex);
 434                                 return 0;
 435                         }
 436                         if (stateless_rpc)
 437                                 exit(0);
 438                         got_common = 0;
 439                         got_other = 0;
 440                         continue;
 441                 }
 442                 if (!prefixcmp(line, "have ")) {
 443                         switch (got_sha1(line+5, sha1)) {
 444                         case -1: /* they have what we do not */
 445                                 got_other = 1;
 446                                 if (multi_ack && ok_to_give_up()) {
 447                                         const char *hex = sha1_to_hex(sha1);
 448                                         if (multi_ack == 2) {
 449                                                 sent_ready = 1;
 450                                                 packet_write(1, "ACK %s ready\n", hex);
 451                                         } else
 452                                                 packet_write(1, "ACK %s continue\n", hex);
 453                                 }
 454                                 break;
 455                         default:
 456                                 got_common = 1;
 457                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 458                                 if (multi_ack == 2)
 459                                         packet_write(1, "ACK %s common\n", last_hex);
 460                                 else if (multi_ack)
 461                                         packet_write(1, "ACK %s continue\n", last_hex);
 462                                 else if (have_obj.nr == 1)
 463                                         packet_write(1, "ACK %s\n", last_hex);
 464                                 break;
 465                         }
 466                         continue;
 467                 }
 468                 if (!strcmp(line, "done")) {
 469                         if (have_obj.nr > 0) {
 470                                 if (multi_ack)
 471                                         packet_write(1, "ACK %s\n", last_hex);
 472                                 return 0;
 473                         }
 474                         packet_write(1, "NAK\n");
 475                         return -1;
 476                 }
 477                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 478         }
 479 }
 480
 481 static int is_our_ref(struct object *o)
 482 {
 483         return o->flags &
 484                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 485 }
 486
 487 static void check_non_tip(void)
 488 {
 489         static const char *argv[] = {
 490                 "rev-list", "--stdin", NULL,
 491         };
 492         static struct child_process cmd;
 493         struct object *o;
 494         char namebuf[42]; /* ^ + SHA-1 + LF */
 495         int i;
 496
 497         /* In the normal in-process case non-tip request can never happen */
 498         if (!stateless_rpc)
 499                 goto error;
 500
 501         cmd.argv = argv;
 502         cmd.git_cmd = 1;
 503         cmd.no_stderr = 1;
 504         cmd.in = -1;
 505         cmd.out = -1;
 506
 507         if (start_command(&cmd))
 508                 goto error;
 509
 510         /*
 511          * If rev-list --stdin encounters an unknown commit, it
 512          * terminates, which will cause SIGPIPE in the write loop
 513          * below.
 514          */
 515         sigchain_push(SIGPIPE, SIG_IGN);
 516
 517         namebuf[0] = '^';
 518         namebuf[41] = '\n';
 519         for (i = get_max_object_index(); 0 < i; ) {
 520                 o = get_indexed_object(--i);
 521                 if (!o)
 522                         continue;
 523                 if (!is_our_ref(o))
 524                         continue;
 525                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 526                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 527                         goto error;
 528         }
 529         namebuf[40] = '\n';
 530         for (i = 0; i < want_obj.nr; i++) {
 531                 o = want_obj.objects[i].item;
 532                 if (is_our_ref(o))
 533                         continue;
 534                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 535                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 536                         goto error;
 537         }
 538         close(cmd.in);
 539
 540         sigchain_pop(SIGPIPE);
 541
 542         /*
 543          * The commits out of the rev-list are not ancestors of
 544          * our ref.
 545          */
 546         i = read_in_full(cmd.out, namebuf, 1);
 547         if (i)
 548                 goto error;
 549         close(cmd.out);
 550
 551         /*
 552          * rev-list may have died by encountering a bad commit
 553          * in the history, in which case we do want to bail out
 554          * even when it showed no commit.
 555          */
 556         if (finish_command(&cmd))
 557                 goto error;
 558
 559         /* All the non-tip ones are ancestors of what we advertised */
 560         return;
 561
 562 error:
 563         /* Pick one of them (we know there at least is one) */
 564         for (i = 0; i < want_obj.nr; i++) {
 565                 o = want_obj.objects[i].item;
 566                 if (!is_our_ref(o))
 567                         die("git upload-pack: not our ref %s",
 568                             sha1_to_hex(o->sha1));
 569         }
 570 }
 571
 572 static void receive_needs(void)
 573 {
 574         struct object_array shallows = OBJECT_ARRAY_INIT;
 575         int depth = 0;
 576         int has_non_tip = 0;
 577
 578         shallow_nr = 0;
 579         for (;;) {
 580                 struct object *o;
 581                 const char *features;
 582                 unsigned char sha1_buf[20];
 583                 char *line = packet_read_line(0, NULL);
 584                 reset_timeout();
 585                 if (!line)
 586                         break;
 587
 588                 if (!prefixcmp(line, "shallow ")) {
 589                         unsigned char sha1[20];
 590                         struct object *object;
 591                         if (get_sha1_hex(line + 8, sha1))
 592                                 die("invalid shallow line: %s", line);
 593                         object = parse_object(sha1);
 594                         if (!object)
 595                                 continue;
 596                         if (object->type != OBJ_COMMIT)
 597                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 598                         if (!(object->flags & CLIENT_SHALLOW)) {
 599                                 object->flags |= CLIENT_SHALLOW;
 600                                 add_object_array(object, NULL, &shallows);
 601                         }
 602                         continue;
 603                 }
 604                 if (!prefixcmp(line, "deepen ")) {
 605                         char *end;
 606                         depth = strtol(line + 7, &end, 0);
 607                         if (end == line + 7 || depth <= 0)
 608                                 die("Invalid deepen: %s", line);
 609                         continue;
 610                 }
 611                 if (prefixcmp(line, "want ") ||
 612                     get_sha1_hex(line+5, sha1_buf))
 613                         die("git upload-pack: protocol error, "
 614                             "expected to get sha, not '%s'", line);
 615
 616                 features = line + 45;
 617
 618                 if (parse_feature_request(features, "multi_ack_detailed"))
 619                         multi_ack = 2;
 620                 else if (parse_feature_request(features, "multi_ack"))
 621                         multi_ack = 1;
 622                 if (parse_feature_request(features, "no-done"))
 623                         no_done = 1;
 624                 if (parse_feature_request(features, "thin-pack"))
 625                         use_thin_pack = 1;
 626                 if (parse_feature_request(features, "ofs-delta"))
 627                         use_ofs_delta = 1;
 628                 if (parse_feature_request(features, "side-band-64k"))
 629                         use_sideband = LARGE_PACKET_MAX;
 630                 else if (parse_feature_request(features, "side-band"))
 631                         use_sideband = DEFAULT_PACKET_MAX;
 632                 if (parse_feature_request(features, "no-progress"))
 633                         no_progress = 1;
 634                 if (parse_feature_request(features, "include-tag"))
 635                         use_include_tag = 1;
 636
 637                 o = parse_object(sha1_buf);
 638                 if (!o)
 639                         die("git upload-pack: not our ref %s",
 640                             sha1_to_hex(sha1_buf));
 641                 if (!(o->flags & WANTED)) {
 642                         o->flags |= WANTED;
 643                         if (!is_our_ref(o))
 644                                 has_non_tip = 1;
 645                         add_object_array(o, NULL, &want_obj);
 646                 }
 647         }
 648
 649         /*
 650          * We have sent all our refs already, and the other end
 651          * should have chosen out of them. When we are operating
 652          * in the stateless RPC mode, however, their choice may
 653          * have been based on the set of older refs advertised
 654          * by another process that handled the initial request.
 655          */
 656         if (has_non_tip)
 657                 check_non_tip();
 658
 659         if (!use_sideband && daemon_mode)
 660                 no_progress = 1;
 661
 662         if (depth == 0 && shallows.nr == 0)
 663                 return;
 664         if (depth > 0) {
 665                 struct commit_list *result = NULL, *backup = NULL;
 666                 int i;
 667                 if (depth == INFINITE_DEPTH)
 668                         for (i = 0; i < shallows.nr; i++) {
 669                                 struct object *object = shallows.objects[i].item;
 670                                 object->flags |= NOT_SHALLOW;
 671                         }
 672                 else
 673                         backup = result =
 674                                 get_shallow_commits(&want_obj, depth,
 675                                                     SHALLOW, NOT_SHALLOW);
 676                 while (result) {
 677                         struct object *object = &result->item->object;
 678                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 679                                 packet_write(1, "shallow %s",
 680                                                 sha1_to_hex(object->sha1));
 681                                 register_shallow(object->sha1);
 682                                 shallow_nr++;
 683                         }
 684                         result = result->next;
 685                 }
 686                 free_commit_list(backup);
 687                 for (i = 0; i < shallows.nr; i++) {
 688                         struct object *object = shallows.objects[i].item;
 689                         if (object->flags & NOT_SHALLOW) {
 690                                 struct commit_list *parents;
 691                                 packet_write(1, "unshallow %s",
 692                                         sha1_to_hex(object->sha1));
 693                                 object->flags &= ~CLIENT_SHALLOW;
 694                                 /* make sure the real parents are parsed */
 695                                 unregister_shallow(object->sha1);
 696                                 object->parsed = 0;
 697                                 if (parse_commit((struct commit *)object))
 698                                         die("invalid commit");
 699                                 parents = ((struct commit *)object)->parents;
 700                                 while (parents) {
 701                                         add_object_array(&parents->item->object,
 702                                                         NULL, &want_obj);
 703                                         parents = parents->next;
 704                                 }
 705                                 add_object_array(object, NULL, &extra_edge_obj);
 706                         }
 707                         /* make sure commit traversal conforms to client */
 708                         register_shallow(object->sha1);
 709                 }
 710                 packet_flush(1);
 711         } else
 712                 if (shallows.nr > 0) {
 713                         int i;
 714                         for (i = 0; i < shallows.nr; i++)
 715                                 register_shallow(shallows.objects[i].item->sha1);
 716                 }
 717
 718         shallow_nr += shallows.nr;
 719         free(shallows.objects);
 720 }
 721
 722 /* return non-zero if the ref is hidden, otherwise 0 */
 723 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 724 {
 725         struct object *o = lookup_unknown_object(sha1);
 726
 727         if (ref_is_hidden(refname)) {
 728                 o->flags |= HIDDEN_REF;
 729                 return 1;
 730         }
 731         if (!o)
 732                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 733         o->flags |= OUR_REF;
 734         return 0;
 735 }
 736
 737 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 738 {
 739         struct string_list_item *item;
 740
 741         if (!symref->nr)
 742                 return;
 743         for_each_string_list_item(item, symref)
 744                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 745 }
 746
 747 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 748 {
 749         static const char *capabilities = "multi_ack thin-pack side-band"
 750                 " side-band-64k ofs-delta shallow no-progress"
 751                 " include-tag multi_ack_detailed";
 752         const char *refname_nons = strip_namespace(refname);
 753         unsigned char peeled[20];
 754
 755         if (mark_our_ref(refname, sha1, flag, NULL))
 756                 return 0;
 757
 758         if (capabilities) {
 759                 struct strbuf symref_info = STRBUF_INIT;
 760
 761                 format_symref_info(&symref_info, cb_data);
 762                 packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
 763                              sha1_to_hex(sha1), refname_nons,
 764                              0, capabilities,
 765                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 766                              stateless_rpc ? " no-done" : "",
 767                              symref_info.buf,
 768                              git_user_agent_sanitized());
 769                 strbuf_release(&symref_info);
 770         } else {
 771                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 772         }
 773         capabilities = NULL;
 774         if (!peel_ref(refname, peeled))
 775                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 776         return 0;
 777 }
 778
 779 static int find_symref(const char *refname, const unsigned char *sha1, int flag,
 780                        void *cb_data)
 781 {
 782         const char *symref_target;
 783         struct string_list_item *item;
 784         unsigned char unused[20];
 785
 786         if ((flag & REF_ISSYMREF) == 0)
 787                 return 0;
 788         symref_target = resolve_ref_unsafe(refname, unused, 0, &flag);
 789         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 790                 die("'%s' is a symref but it is not?", refname);
 791         item = string_list_append(cb_data, refname);
 792         item->util = xstrdup(symref_target);
 793         return 0;
 794 }
 795
 796 static void upload_pack(void)
 797 {
 798         struct string_list symref = STRING_LIST_INIT_DUP;
 799
 800         head_ref_namespaced(find_symref, &symref);
 801         for_each_namespaced_ref(find_symref, &symref);
 802
 803         if (advertise_refs || !stateless_rpc) {
 804                 reset_timeout();
 805                 head_ref_namespaced(send_ref, &symref);
 806                 for_each_namespaced_ref(send_ref, &symref);
 807                 packet_flush(1);
 808         } else {
 809                 head_ref_namespaced(mark_our_ref, NULL);
 810                 for_each_namespaced_ref(mark_our_ref, NULL);
 811         }
 812         string_list_clear(&symref, 1);
 813         if (advertise_refs)
 814                 return;
 815
 816         receive_needs();
 817         if (want_obj.nr) {
 818                 get_common_commits();
 819                 create_pack_file();
 820         }
 821 }
 822
 823 static int upload_pack_config(const char *var, const char *value, void *unused)
 824 {
 825         if (!strcmp("uploadpack.allowtipsha1inwant", var))
 826                 allow_tip_sha1_in_want = git_config_bool(var, value);
 827         return parse_hide_refs_config(var, value, "uploadpack");
 828 }
 829
 830 int main(int argc, char **argv)
 831 {
 832         char *dir;
 833         int i;
 834         int strict = 0;
 835
 836         git_setup_gettext();
 837
 838         packet_trace_identity("upload-pack");
 839         git_extract_argv0_path(argv[0]);
 840         read_replace_refs = 0;
 841
 842         for (i = 1; i < argc; i++) {
 843                 char *arg = argv[i];
 844
 845                 if (arg[0] != '-')
 846                         break;
 847                 if (!strcmp(arg, "--advertise-refs")) {
 848                         advertise_refs = 1;
 849                         continue;
 850                 }
 851                 if (!strcmp(arg, "--stateless-rpc")) {
 852                         stateless_rpc = 1;
 853                         continue;
 854                 }
 855                 if (!strcmp(arg, "--strict")) {
 856                         strict = 1;
 857                         continue;
 858                 }
 859                 if (!prefixcmp(arg, "--timeout=")) {
 860                         timeout = atoi(arg+10);
 861                         daemon_mode = 1;
 862                         continue;
 863                 }
 864                 if (!strcmp(arg, "--")) {
 865                         i++;
 866                         break;
 867                 }
 868         }
 869
 870         if (i != argc-1)
 871                 usage(upload_pack_usage);
 872
 873         setup_path();
 874
 875         dir = argv[i];
 876
 877         if (!enter_repo(dir, strict))
 878                 die("'%s' does not appear to be a git repository", dir);
 879         if (is_repository_shallow())
 880                 die("attempt to fetch/clone from a shallow repository");
 881         git_config(upload_pack_config, NULL);
 882         upload_pack();
 883         return 0;
 884 }