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
  30 static unsigned long oldest_have;
  31
  32 static int multi_ack;
  33 static int no_done;
  34 static int use_thin_pack, use_ofs_delta, use_include_tag;
  35 static int no_progress, daemon_mode;
  36 static int shallow_nr;
  37 static struct object_array have_obj;
  38 static struct object_array want_obj;
  39 static struct object_array extra_edge_obj;
  40 static unsigned int timeout;
  41 /* 0 for no sideband,
  42  * otherwise maximum packet size (up to 65520 bytes).
  43  */
  44 static int use_sideband;
  45 static int debug_fd;
  46 static int advertise_refs;
  47 static int stateless_rpc;
  48
  49 static void reset_timeout(void)
  50 {
  51         alarm(timeout);
  52 }
  53
  54 static int strip(char *line, int len)
  55 {
  56         if (len && line[len-1] == '\n')
  57                 line[--len] = 0;
  58         return len;
  59 }
  60
  61 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  62 {
  63         if (use_sideband)
  64                 return send_sideband(1, fd, data, sz, use_sideband);
  65         if (fd == 3)
  66                 /* emergency quit */
  67                 fd = 2;
  68         if (fd == 2) {
  69                 /* XXX: are we happy to lose stuff here? */
  70                 xwrite(fd, data, sz);
  71                 return sz;
  72         }
  73         return safe_write(fd, data, sz);
  74 }
  75
  76 static FILE *pack_pipe = NULL;
  77 static void show_commit(struct commit *commit, void *data)
  78 {
  79         if (commit->object.flags & BOUNDARY)
  80                 fputc('-', pack_pipe);
  81         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
  82                 die("broken output pipe");
  83         fputc('\n', pack_pipe);
  84         fflush(pack_pipe);
  85         free(commit->buffer);
  86         commit->buffer = NULL;
  87 }
  88
  89 static void show_object(struct object *obj,
  90                         const struct name_path *path, const char *component,
  91                         void *cb_data)
  92 {
  93         show_object_with_name(pack_pipe, obj, path, component);
  94 }
  95
  96 static void show_edge(struct commit *commit)
  97 {
  98         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
  99 }
 100
 101 static int do_rev_list(int in, int out, void *user_data)
 102 {
 103         int i;
 104         struct rev_info revs;
 105
 106         pack_pipe = xfdopen(out, "w");
 107         init_revisions(&revs, NULL);
 108         revs.tag_objects = 1;
 109         revs.tree_objects = 1;
 110         revs.blob_objects = 1;
 111         if (use_thin_pack)
 112                 revs.edge_hint = 1;
 113
 114         for (i = 0; i < want_obj.nr; i++) {
 115                 struct object *o = want_obj.objects[i].item;
 116                 /* why??? */
 117                 o->flags &= ~UNINTERESTING;
 118                 add_pending_object(&revs, o, NULL);
 119         }
 120         for (i = 0; i < have_obj.nr; i++) {
 121                 struct object *o = have_obj.objects[i].item;
 122                 o->flags |= UNINTERESTING;
 123                 add_pending_object(&revs, o, NULL);
 124         }
 125         setup_revisions(0, NULL, &revs, NULL);
 126         if (prepare_revision_walk(&revs))
 127                 die("revision walk setup failed");
 128         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 129         if (use_thin_pack)
 130                 for (i = 0; i < extra_edge_obj.nr; i++)
 131                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
 132                                         extra_edge_obj.objects[i].item->sha1));
 133         traverse_commit_list(&revs, show_commit, show_object, NULL);
 134         fflush(pack_pipe);
 135         fclose(pack_pipe);
 136         return 0;
 137 }
 138
 139 static void create_pack_file(void)
 140 {
 141         struct async rev_list;
 142         struct child_process pack_objects;
 143         char data[8193], progress[128];
 144         char abort_msg[] = "aborting due to possible repository "
 145                 "corruption on the remote side.";
 146         int buffered = -1;
 147         ssize_t sz;
 148         const char *argv[10];
 149         int arg = 0;
 150
 151         argv[arg++] = "pack-objects";
 152         if (!shallow_nr) {
 153                 argv[arg++] = "--revs";
 154                 if (use_thin_pack)
 155                         argv[arg++] = "--thin";
 156         }
 157
 158         argv[arg++] = "--stdout";
 159         if (!no_progress)
 160                 argv[arg++] = "--progress";
 161         if (use_ofs_delta)
 162                 argv[arg++] = "--delta-base-offset";
 163         if (use_include_tag)
 164                 argv[arg++] = "--include-tag";
 165         argv[arg++] = NULL;
 166
 167         memset(&pack_objects, 0, sizeof(pack_objects));
 168         pack_objects.in = -1;
 169         pack_objects.out = -1;
 170         pack_objects.err = -1;
 171         pack_objects.git_cmd = 1;
 172         pack_objects.argv = argv;
 173
 174         if (start_command(&pack_objects))
 175                 die("git upload-pack: unable to fork git-pack-objects");
 176
 177         if (shallow_nr) {
 178                 memset(&rev_list, 0, sizeof(rev_list));
 179                 rev_list.proc = do_rev_list;
 180                 rev_list.out = pack_objects.in;
 181                 if (start_async(&rev_list))
 182                         die("git upload-pack: unable to fork git-rev-list");
 183         }
 184         else {
 185                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
 186                 int i;
 187
 188                 for (i = 0; i < want_obj.nr; i++)
 189                         fprintf(pipe_fd, "%s\n",
 190                                 sha1_to_hex(want_obj.objects[i].item->sha1));
 191                 fprintf(pipe_fd, "--not\n");
 192                 for (i = 0; i < have_obj.nr; i++)
 193                         fprintf(pipe_fd, "%s\n",
 194                                 sha1_to_hex(have_obj.objects[i].item->sha1));
 195                 fprintf(pipe_fd, "\n");
 196                 fflush(pipe_fd);
 197                 fclose(pipe_fd);
 198         }
 199
 200
 201         /* We read from pack_objects.err to capture stderr output for
 202          * progress bar, and pack_objects.out to capture the pack data.
 203          */
 204
 205         while (1) {
 206                 struct pollfd pfd[2];
 207                 int pe, pu, pollsize;
 208
 209                 reset_timeout();
 210
 211                 pollsize = 0;
 212                 pe = pu = -1;
 213
 214                 if (0 <= pack_objects.out) {
 215                         pfd[pollsize].fd = pack_objects.out;
 216                         pfd[pollsize].events = POLLIN;
 217                         pu = pollsize;
 218                         pollsize++;
 219                 }
 220                 if (0 <= pack_objects.err) {
 221                         pfd[pollsize].fd = pack_objects.err;
 222                         pfd[pollsize].events = POLLIN;
 223                         pe = pollsize;
 224                         pollsize++;
 225                 }
 226
 227                 if (!pollsize)
 228                         break;
 229
 230                 if (poll(pfd, pollsize, -1) < 0) {
 231                         if (errno != EINTR) {
 232                                 error("poll failed, resuming: %s",
 233                                       strerror(errno));
 234                                 sleep(1);
 235                         }
 236                         continue;
 237                 }
 238                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 239                         /* Status ready; we ship that in the side-band
 240                          * or dump to the standard error.
 241                          */
 242                         sz = xread(pack_objects.err, progress,
 243                                   sizeof(progress));
 244                         if (0 < sz)
 245                                 send_client_data(2, progress, sz);
 246                         else if (sz == 0) {
 247                                 close(pack_objects.err);
 248                                 pack_objects.err = -1;
 249                         }
 250                         else
 251                                 goto fail;
 252                         /* give priority to status messages */
 253                         continue;
 254                 }
 255                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 256                         /* Data ready; we keep the last byte to ourselves
 257                          * in case we detect broken rev-list, so that we
 258                          * can leave the stream corrupted.  This is
 259                          * unfortunate -- unpack-objects would happily
 260                          * accept a valid packdata with trailing garbage,
 261                          * so appending garbage after we pass all the
 262                          * pack data is not good enough to signal
 263                          * breakage to downstream.
 264                          */
 265                         char *cp = data;
 266                         ssize_t outsz = 0;
 267                         if (0 <= buffered) {
 268                                 *cp++ = buffered;
 269                                 outsz++;
 270                         }
 271                         sz = xread(pack_objects.out, cp,
 272                                   sizeof(data) - outsz);
 273                         if (0 < sz)
 274                                 ;
 275                         else if (sz == 0) {
 276                                 close(pack_objects.out);
 277                                 pack_objects.out = -1;
 278                         }
 279                         else
 280                                 goto fail;
 281                         sz += outsz;
 282                         if (1 < sz) {
 283                                 buffered = data[sz-1] & 0xFF;
 284                                 sz--;
 285                         }
 286                         else
 287                                 buffered = -1;
 288                         sz = send_client_data(1, data, sz);
 289                         if (sz < 0)
 290                                 goto fail;
 291                 }
 292         }
 293
 294         if (finish_command(&pack_objects)) {
 295                 error("git upload-pack: git-pack-objects died with error.");
 296                 goto fail;
 297         }
 298         if (shallow_nr && finish_async(&rev_list))
 299                 goto fail;      /* error was already reported */
 300
 301         /* flush the data */
 302         if (0 <= buffered) {
 303                 data[0] = buffered;
 304                 sz = send_client_data(1, data, 1);
 305                 if (sz < 0)
 306                         goto fail;
 307                 fprintf(stderr, "flushed.\n");
 308         }
 309         if (use_sideband)
 310                 packet_flush(1);
 311         return;
 312
 313  fail:
 314         send_client_data(3, abort_msg, sizeof(abort_msg));
 315         die("git upload-pack: %s", abort_msg);
 316 }
 317
 318 static int got_sha1(char *hex, unsigned char *sha1)
 319 {
 320         struct object *o;
 321         int we_knew_they_have = 0;
 322
 323         if (get_sha1_hex(hex, sha1))
 324                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 325         if (!has_sha1_file(sha1))
 326                 return -1;
 327
 328         o = lookup_object(sha1);
 329         if (!(o && o->parsed))
 330                 o = parse_object(sha1);
 331         if (!o)
 332                 die("oops (%s)", sha1_to_hex(sha1));
 333         if (o->type == OBJ_COMMIT) {
 334                 struct commit_list *parents;
 335                 struct commit *commit = (struct commit *)o;
 336                 if (o->flags & THEY_HAVE)
 337                         we_knew_they_have = 1;
 338                 else
 339                         o->flags |= THEY_HAVE;
 340                 if (!oldest_have || (commit->date < oldest_have))
 341                         oldest_have = commit->date;
 342                 for (parents = commit->parents;
 343                      parents;
 344                      parents = parents->next)
 345                         parents->item->object.flags |= THEY_HAVE;
 346         }
 347         if (!we_knew_they_have) {
 348                 add_object_array(o, NULL, &have_obj);
 349                 return 1;
 350         }
 351         return 0;
 352 }
 353
 354 static int reachable(struct commit *want)
 355 {
 356         struct commit_list *work = NULL;
 357
 358         commit_list_insert_by_date(want, &work);
 359         while (work) {
 360                 struct commit_list *list = work->next;
 361                 struct commit *commit = work->item;
 362                 free(work);
 363                 work = list;
 364
 365                 if (commit->object.flags & THEY_HAVE) {
 366                         want->object.flags |= COMMON_KNOWN;
 367                         break;
 368                 }
 369                 if (!commit->object.parsed)
 370                         parse_object(commit->object.sha1);
 371                 if (commit->object.flags & REACHABLE)
 372                         continue;
 373                 commit->object.flags |= REACHABLE;
 374                 if (commit->date < oldest_have)
 375                         continue;
 376                 for (list = commit->parents; list; list = list->next) {
 377                         struct commit *parent = list->item;
 378                         if (!(parent->object.flags & REACHABLE))
 379                                 commit_list_insert_by_date(parent, &work);
 380                 }
 381         }
 382         want->object.flags |= REACHABLE;
 383         clear_commit_marks(want, REACHABLE);
 384         free_commit_list(work);
 385         return (want->object.flags & COMMON_KNOWN);
 386 }
 387
 388 static int ok_to_give_up(void)
 389 {
 390         int i;
 391
 392         if (!have_obj.nr)
 393                 return 0;
 394
 395         for (i = 0; i < want_obj.nr; i++) {
 396                 struct object *want = want_obj.objects[i].item;
 397
 398                 if (want->flags & COMMON_KNOWN)
 399                         continue;
 400                 want = deref_tag(want, "a want line", 0);
 401                 if (!want || want->type != OBJ_COMMIT) {
 402                         /* no way to tell if this is reachable by
 403                          * looking at the ancestry chain alone, so
 404                          * leave a note to ourselves not to worry about
 405                          * this object anymore.
 406                          */
 407                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 408                         continue;
 409                 }
 410                 if (!reachable((struct commit *)want))
 411                         return 0;
 412         }
 413         return 1;
 414 }
 415
 416 static int get_common_commits(void)
 417 {
 418         static char line[1000];
 419         unsigned char sha1[20];
 420         char last_hex[41];
 421         int got_common = 0;
 422         int got_other = 0;
 423         int sent_ready = 0;
 424
 425         save_commit_buffer = 0;
 426
 427         for (;;) {
 428                 int len = packet_read_line(0, line, sizeof(line));
 429                 reset_timeout();
 430
 431                 if (!len) {
 432                         if (multi_ack == 2 && got_common
 433                             && !got_other && ok_to_give_up()) {
 434                                 sent_ready = 1;
 435                                 packet_write(1, "ACK %s ready\n", last_hex);
 436                         }
 437                         if (have_obj.nr == 0 || multi_ack)
 438                                 packet_write(1, "NAK\n");
 439
 440                         if (no_done && sent_ready) {
 441                                 packet_write(1, "ACK %s\n", last_hex);
 442                                 return 0;
 443                         }
 444                         if (stateless_rpc)
 445                                 exit(0);
 446                         got_common = 0;
 447                         got_other = 0;
 448                         continue;
 449                 }
 450                 strip(line, len);
 451                 if (!prefixcmp(line, "have ")) {
 452                         switch (got_sha1(line+5, sha1)) {
 453                         case -1: /* they have what we do not */
 454                                 got_other = 1;
 455                                 if (multi_ack && ok_to_give_up()) {
 456                                         const char *hex = sha1_to_hex(sha1);
 457                                         if (multi_ack == 2) {
 458                                                 sent_ready = 1;
 459                                                 packet_write(1, "ACK %s ready\n", hex);
 460                                         } else
 461                                                 packet_write(1, "ACK %s continue\n", hex);
 462                                 }
 463                                 break;
 464                         default:
 465                                 got_common = 1;
 466                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 467                                 if (multi_ack == 2)
 468                                         packet_write(1, "ACK %s common\n", last_hex);
 469                                 else if (multi_ack)
 470                                         packet_write(1, "ACK %s continue\n", last_hex);
 471                                 else if (have_obj.nr == 1)
 472                                         packet_write(1, "ACK %s\n", last_hex);
 473                                 break;
 474                         }
 475                         continue;
 476                 }
 477                 if (!strcmp(line, "done")) {
 478                         if (have_obj.nr > 0) {
 479                                 if (multi_ack)
 480                                         packet_write(1, "ACK %s\n", last_hex);
 481                                 return 0;
 482                         }
 483                         packet_write(1, "NAK\n");
 484                         return -1;
 485                 }
 486                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 487         }
 488 }
 489
 490 static void check_non_tip(void)
 491 {
 492         static const char *argv[] = {
 493                 "rev-list", "--stdin", NULL,
 494         };
 495         static struct child_process cmd;
 496         struct object *o;
 497         char namebuf[42]; /* ^ + SHA-1 + LF */
 498         int i;
 499
 500         /* In the normal in-process case non-tip request can never happen */
 501         if (!stateless_rpc)
 502                 goto error;
 503
 504         cmd.argv = argv;
 505         cmd.git_cmd = 1;
 506         cmd.no_stderr = 1;
 507         cmd.in = -1;
 508         cmd.out = -1;
 509
 510         if (start_command(&cmd))
 511                 goto error;
 512
 513         /*
 514          * If rev-list --stdin encounters an unknown commit, it
 515          * terminates, which will cause SIGPIPE in the write loop
 516          * below.
 517          */
 518         sigchain_push(SIGPIPE, SIG_IGN);
 519
 520         namebuf[0] = '^';
 521         namebuf[41] = '\n';
 522         for (i = get_max_object_index(); 0 < i; ) {
 523                 o = get_indexed_object(--i);
 524                 if (!o)
 525                         continue;
 526                 if (!(o->flags & OUR_REF))
 527                         continue;
 528                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 529                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 530                         goto error;
 531         }
 532         namebuf[40] = '\n';
 533         for (i = 0; i < want_obj.nr; i++) {
 534                 o = want_obj.objects[i].item;
 535                 if (o->flags & OUR_REF)
 536                         continue;
 537                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 538                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 539                         goto error;
 540         }
 541         close(cmd.in);
 542
 543         sigchain_pop(SIGPIPE);
 544
 545         /*
 546          * The commits out of the rev-list are not ancestors of
 547          * our ref.
 548          */
 549         i = read_in_full(cmd.out, namebuf, 1);
 550         if (i)
 551                 goto error;
 552         close(cmd.out);
 553
 554         /*
 555          * rev-list may have died by encountering a bad commit
 556          * in the history, in which case we do want to bail out
 557          * even when it showed no commit.
 558          */
 559         if (finish_command(&cmd))
 560                 goto error;
 561
 562         /* All the non-tip ones are ancestors of what we advertised */
 563         return;
 564
 565 error:
 566         /* Pick one of them (we know there at least is one) */
 567         for (i = 0; i < want_obj.nr; i++) {
 568                 o = want_obj.objects[i].item;
 569                 if (!(o->flags & OUR_REF))
 570                         die("git upload-pack: not our ref %s",
 571                             sha1_to_hex(o->sha1));
 572         }
 573 }
 574
 575 static void receive_needs(void)
 576 {
 577         struct object_array shallows = OBJECT_ARRAY_INIT;
 578         static char line[1000];
 579         int len, depth = 0;
 580         int has_non_tip = 0;
 581
 582         shallow_nr = 0;
 583         if (debug_fd)
 584                 write_str_in_full(debug_fd, "#S\n");
 585         for (;;) {
 586                 struct object *o;
 587                 const char *features;
 588                 unsigned char sha1_buf[20];
 589                 len = packet_read_line(0, line, sizeof(line));
 590                 reset_timeout();
 591                 if (!len)
 592                         break;
 593                 if (debug_fd)
 594                         write_in_full(debug_fd, line, len);
 595
 596                 if (!prefixcmp(line, "shallow ")) {
 597                         unsigned char sha1[20];
 598                         struct object *object;
 599                         if (get_sha1(line + 8, sha1))
 600                                 die("invalid shallow line: %s", line);
 601                         object = parse_object(sha1);
 602                         if (!object)
 603                                 die("did not find object for %s", line);
 604                         if (object->type != OBJ_COMMIT)
 605                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 606                         object->flags |= CLIENT_SHALLOW;
 607                         add_object_array(object, NULL, &shallows);
 608                         continue;
 609                 }
 610                 if (!prefixcmp(line, "deepen ")) {
 611                         char *end;
 612                         depth = strtol(line + 7, &end, 0);
 613                         if (end == line + 7 || depth <= 0)
 614                                 die("Invalid deepen: %s", line);
 615                         continue;
 616                 }
 617                 if (prefixcmp(line, "want ") ||
 618                     get_sha1_hex(line+5, sha1_buf))
 619                         die("git upload-pack: protocol error, "
 620                             "expected to get sha, not '%s'", line);
 621
 622                 features = line + 45;
 623
 624                 if (parse_feature_request(features, "multi_ack_detailed"))
 625                         multi_ack = 2;
 626                 else if (parse_feature_request(features, "multi_ack"))
 627                         multi_ack = 1;
 628                 if (parse_feature_request(features, "no-done"))
 629                         no_done = 1;
 630                 if (parse_feature_request(features, "thin-pack"))
 631                         use_thin_pack = 1;
 632                 if (parse_feature_request(features, "ofs-delta"))
 633                         use_ofs_delta = 1;
 634                 if (parse_feature_request(features, "side-band-64k"))
 635                         use_sideband = LARGE_PACKET_MAX;
 636                 else if (parse_feature_request(features, "side-band"))
 637                         use_sideband = DEFAULT_PACKET_MAX;
 638                 if (parse_feature_request(features, "no-progress"))
 639                         no_progress = 1;
 640                 if (parse_feature_request(features, "include-tag"))
 641                         use_include_tag = 1;
 642
 643                 o = lookup_object(sha1_buf);
 644                 if (!o)
 645                         die("git upload-pack: not our ref %s",
 646                             sha1_to_hex(sha1_buf));
 647                 if (!(o->flags & WANTED)) {
 648                         o->flags |= WANTED;
 649                         if (!(o->flags & OUR_REF))
 650                                 has_non_tip = 1;
 651                         add_object_array(o, NULL, &want_obj);
 652                 }
 653         }
 654         if (debug_fd)
 655                 write_str_in_full(debug_fd, "#E\n");
 656
 657         /*
 658          * We have sent all our refs already, and the other end
 659          * should have chosen out of them. When we are operating
 660          * in the stateless RPC mode, however, their choice may
 661          * have been based on the set of older refs advertised
 662          * by another process that handled the initial request.
 663          */
 664         if (has_non_tip)
 665                 check_non_tip();
 666
 667         if (!use_sideband && daemon_mode)
 668                 no_progress = 1;
 669
 670         if (depth == 0 && shallows.nr == 0)
 671                 return;
 672         if (depth > 0) {
 673                 struct commit_list *result = NULL, *backup = NULL;
 674                 int i;
 675                 if (depth == INFINITE_DEPTH)
 676                         for (i = 0; i < shallows.nr; i++) {
 677                                 struct object *object = shallows.objects[i].item;
 678                                 object->flags |= NOT_SHALLOW;
 679                         }
 680                 else
 681                         backup = result =
 682                                 get_shallow_commits(&want_obj, depth,
 683                                                     SHALLOW, NOT_SHALLOW);
 684                 while (result) {
 685                         struct object *object = &result->item->object;
 686                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 687                                 packet_write(1, "shallow %s",
 688                                                 sha1_to_hex(object->sha1));
 689                                 register_shallow(object->sha1);
 690                                 shallow_nr++;
 691                         }
 692                         result = result->next;
 693                 }
 694                 free_commit_list(backup);
 695                 for (i = 0; i < shallows.nr; i++) {
 696                         struct object *object = shallows.objects[i].item;
 697                         if (object->flags & NOT_SHALLOW) {
 698                                 struct commit_list *parents;
 699                                 packet_write(1, "unshallow %s",
 700                                         sha1_to_hex(object->sha1));
 701                                 object->flags &= ~CLIENT_SHALLOW;
 702                                 /* make sure the real parents are parsed */
 703                                 unregister_shallow(object->sha1);
 704                                 object->parsed = 0;
 705                                 if (parse_commit((struct commit *)object))
 706                                         die("invalid commit");
 707                                 parents = ((struct commit *)object)->parents;
 708                                 while (parents) {
 709                                         add_object_array(&parents->item->object,
 710                                                         NULL, &want_obj);
 711                                         parents = parents->next;
 712                                 }
 713                                 add_object_array(object, NULL, &extra_edge_obj);
 714                         }
 715                         /* make sure commit traversal conforms to client */
 716                         register_shallow(object->sha1);
 717                 }
 718                 packet_flush(1);
 719         } else
 720                 if (shallows.nr > 0) {
 721                         int i;
 722                         for (i = 0; i < shallows.nr; i++)
 723                                 register_shallow(shallows.objects[i].item->sha1);
 724                 }
 725
 726         shallow_nr += shallows.nr;
 727         free(shallows.objects);
 728 }
 729
 730 /* return non-zero if the ref is hidden, otherwise 0 */
 731 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 732 {
 733         struct object *o = lookup_unknown_object(sha1);
 734
 735         if (ref_is_hidden(refname))
 736                 return 1;
 737         if (!o)
 738                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 739         o->flags |= OUR_REF;
 740         return 0;
 741 }
 742
 743 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 744 {
 745         static const char *capabilities = "multi_ack thin-pack side-band"
 746                 " side-band-64k ofs-delta shallow no-progress"
 747                 " include-tag multi_ack_detailed";
 748         const char *refname_nons = strip_namespace(refname);
 749         unsigned char peeled[20];
 750
 751         if (mark_our_ref(refname, sha1, flag, cb_data))
 752                 return 0;
 753
 754         if (capabilities)
 755                 packet_write(1, "%s %s%c%s%s agent=%s\n",
 756                              sha1_to_hex(sha1), refname_nons,
 757                              0, capabilities,
 758                              stateless_rpc ? " no-done" : "",
 759                              git_user_agent_sanitized());
 760         else
 761                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 762         capabilities = NULL;
 763         if (!peel_ref(refname, peeled))
 764                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 765         return 0;
 766 }
 767
 768 static void upload_pack(void)
 769 {
 770         if (advertise_refs || !stateless_rpc) {
 771                 reset_timeout();
 772                 head_ref_namespaced(send_ref, NULL);
 773                 for_each_namespaced_ref(send_ref, NULL);
 774                 packet_flush(1);
 775         } else {
 776                 head_ref_namespaced(mark_our_ref, NULL);
 777                 for_each_namespaced_ref(mark_our_ref, NULL);
 778         }
 779         if (advertise_refs)
 780                 return;
 781
 782         receive_needs();
 783         if (want_obj.nr) {
 784                 get_common_commits();
 785                 create_pack_file();
 786         }
 787 }
 788
 789 static int upload_pack_config(const char *var, const char *value, void *unused)
 790 {
 791         return parse_hide_refs_config(var, value, "uploadpack");
 792 }
 793
 794 int main(int argc, char **argv)
 795 {
 796         char *dir;
 797         int i;
 798         int strict = 0;
 799
 800         git_setup_gettext();
 801
 802         packet_trace_identity("upload-pack");
 803         git_extract_argv0_path(argv[0]);
 804         read_replace_refs = 0;
 805
 806         for (i = 1; i < argc; i++) {
 807                 char *arg = argv[i];
 808
 809                 if (arg[0] != '-')
 810                         break;
 811                 if (!strcmp(arg, "--advertise-refs")) {
 812                         advertise_refs = 1;
 813                         continue;
 814                 }
 815                 if (!strcmp(arg, "--stateless-rpc")) {
 816                         stateless_rpc = 1;
 817                         continue;
 818                 }
 819                 if (!strcmp(arg, "--strict")) {
 820                         strict = 1;
 821                         continue;
 822                 }
 823                 if (!prefixcmp(arg, "--timeout=")) {
 824                         timeout = atoi(arg+10);
 825                         daemon_mode = 1;
 826                         continue;
 827                 }
 828                 if (!strcmp(arg, "--")) {
 829                         i++;
 830                         break;
 831                 }
 832         }
 833
 834         if (i != argc-1)
 835                 usage(upload_pack_usage);
 836
 837         setup_path();
 838
 839         dir = argv[i];
 840
 841         if (!enter_repo(dir, strict))
 842                 die("'%s' does not appear to be a git repository", dir);
 843         if (is_repository_shallow())
 844                 die("attempt to fetch/clone from a shallow repository");
 845         git_config(upload_pack_config, NULL);
 846         if (getenv("GIT_DEBUG_SEND_PACK"))
 847                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
 848         upload_pack();
 849         return 0;
 850 }