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
  14 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=nn] <dir>";
  15
  16 /* bits #0..7 in revision.h, #8..10 in commit.c */
  17 #define THEY_HAVE       (1u << 11)
  18 #define OUR_REF         (1u << 12)
  19 #define WANTED          (1u << 13)
  20 #define COMMON_KNOWN    (1u << 14)
  21 #define REACHABLE       (1u << 15)
  22
  23 #define SHALLOW         (1u << 16)
  24 #define NOT_SHALLOW     (1u << 17)
  25 #define CLIENT_SHALLOW  (1u << 18)
  26
  27 static unsigned long oldest_have;
  28
  29 static int multi_ack, nr_our_refs;
  30 static int use_thin_pack, use_ofs_delta, use_include_tag;
  31 static int no_progress, daemon_mode;
  32 static int shallow_nr;
  33 static struct object_array have_obj;
  34 static struct object_array want_obj;
  35 static struct object_array extra_edge_obj;
  36 static unsigned int timeout;
  37 /* 0 for no sideband,
  38  * otherwise maximum packet size (up to 65520 bytes).
  39  */
  40 static int use_sideband;
  41 static int debug_fd;
  42 static int advertise_refs;
  43 static int stateless_rpc;
  44
  45 static void reset_timeout(void)
  46 {
  47         alarm(timeout);
  48 }
  49
  50 static int strip(char *line, int len)
  51 {
  52         if (len && line[len-1] == '\n')
  53                 line[--len] = 0;
  54         return len;
  55 }
  56
  57 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  58 {
  59         if (use_sideband)
  60                 return send_sideband(1, fd, data, sz, use_sideband);
  61         if (fd == 3)
  62                 /* emergency quit */
  63                 fd = 2;
  64         if (fd == 2) {
  65                 /* XXX: are we happy to lose stuff here? */
  66                 xwrite(fd, data, sz);
  67                 return sz;
  68         }
  69         return safe_write(fd, data, sz);
  70 }
  71
  72 static FILE *pack_pipe = NULL;
  73 static void show_commit(struct commit *commit, void *data)
  74 {
  75         if (commit->object.flags & BOUNDARY)
  76                 fputc('-', pack_pipe);
  77         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
  78                 die("broken output pipe");
  79         fputc('\n', pack_pipe);
  80         fflush(pack_pipe);
  81         free(commit->buffer);
  82         commit->buffer = NULL;
  83 }
  84
  85 static void show_object(struct object *obj, const struct name_path *path, const char *component)
  86 {
  87         /* An object with name "foo\n0000000..." can be used to
  88          * confuse downstream git-pack-objects very badly.
  89          */
  90         const char *name = path_name(path, component);
  91         const char *ep = strchr(name, '\n');
  92         if (ep) {
  93                 fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(obj->sha1),
  94                        (int) (ep - name),
  95                        name);
  96         }
  97         else
  98                 fprintf(pack_pipe, "%s %s\n",
  99                                 sha1_to_hex(obj->sha1), name);
 100         free((char *)name);
 101 }
 102
 103 static void show_edge(struct commit *commit)
 104 {
 105         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
 106 }
 107
 108 static int do_rev_list(int fd, void *create_full_pack)
 109 {
 110         int i;
 111         struct rev_info revs;
 112
 113         pack_pipe = xfdopen(fd, "w");
 114         init_revisions(&revs, NULL);
 115         revs.tag_objects = 1;
 116         revs.tree_objects = 1;
 117         revs.blob_objects = 1;
 118         if (use_thin_pack)
 119                 revs.edge_hint = 1;
 120
 121         if (create_full_pack) {
 122                 const char *args[] = {"rev-list", "--all", NULL};
 123                 setup_revisions(2, args, &revs, NULL);
 124         } else {
 125                 for (i = 0; i < want_obj.nr; i++) {
 126                         struct object *o = want_obj.objects[i].item;
 127                         /* why??? */
 128                         o->flags &= ~UNINTERESTING;
 129                         add_pending_object(&revs, o, NULL);
 130                 }
 131                 for (i = 0; i < have_obj.nr; i++) {
 132                         struct object *o = have_obj.objects[i].item;
 133                         o->flags |= UNINTERESTING;
 134                         add_pending_object(&revs, o, NULL);
 135                 }
 136                 setup_revisions(0, NULL, &revs, NULL);
 137         }
 138         if (prepare_revision_walk(&revs))
 139                 die("revision walk setup failed");
 140         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 141         if (use_thin_pack)
 142                 for (i = 0; i < extra_edge_obj.nr; i++)
 143                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
 144                                         extra_edge_obj.objects[i].item->sha1));
 145         traverse_commit_list(&revs, show_commit, show_object, NULL);
 146         fflush(pack_pipe);
 147         fclose(pack_pipe);
 148         return 0;
 149 }
 150
 151 static int feed_msg_to_hook(int fd, const char *fmt, ...)
 152 {
 153         int cnt;
 154         char buf[1024];
 155         va_list params;
 156
 157         va_start(params, fmt);
 158         cnt = vsprintf(buf, fmt, params);
 159         va_end(params);
 160         return write_in_full(fd, buf, cnt) != cnt;
 161 }
 162
 163 static int feed_obj_to_hook(const char *label, struct object_array *oa, int i, int fd)
 164 {
 165         return feed_msg_to_hook(fd, "%s %s\n", label,
 166                                 sha1_to_hex(oa->objects[i].item->sha1));
 167 }
 168
 169 static int run_post_upload_pack_hook(size_t total, struct timeval *tv)
 170 {
 171         const char *argv[2];
 172         struct child_process proc;
 173         int err, i;
 174
 175         argv[0] = "hooks/post-upload-pack";
 176         argv[1] = NULL;
 177
 178         if (access(argv[0], X_OK) < 0)
 179                 return 0;
 180
 181         memset(&proc, 0, sizeof(proc));
 182         proc.argv = argv;
 183         proc.in = -1;
 184         proc.stdout_to_stderr = 1;
 185         err = start_command(&proc);
 186         if (err)
 187                 return err;
 188         for (i = 0; !err && i < want_obj.nr; i++)
 189                 err |= feed_obj_to_hook("want", &want_obj, i, proc.in);
 190         for (i = 0; !err && i < have_obj.nr; i++)
 191                 err |= feed_obj_to_hook("have", &have_obj, i, proc.in);
 192         if (!err)
 193                 err |= feed_msg_to_hook(proc.in, "time %ld.%06ld\n",
 194                                         (long)tv->tv_sec, (long)tv->tv_usec);
 195         if (!err)
 196                 err |= feed_msg_to_hook(proc.in, "size %ld\n", (long)total);
 197         if (!err)
 198                 err |= feed_msg_to_hook(proc.in, "kind %s\n",
 199                                         (nr_our_refs == want_obj.nr && !have_obj.nr)
 200                                         ? "clone" : "fetch");
 201         if (close(proc.in))
 202                 err = 1;
 203         if (finish_command(&proc))
 204                 err = 1;
 205         return err;
 206 }
 207
 208 static void create_pack_file(void)
 209 {
 210         struct timeval start_tv, tv;
 211         struct async rev_list;
 212         struct child_process pack_objects;
 213         int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
 214         char data[8193], progress[128];
 215         char abort_msg[] = "aborting due to possible repository "
 216                 "corruption on the remote side.";
 217         int buffered = -1;
 218         ssize_t sz, total_sz;
 219         const char *argv[10];
 220         int arg = 0;
 221
 222         gettimeofday(&start_tv, NULL);
 223         total_sz = 0;
 224         if (shallow_nr) {
 225                 rev_list.proc = do_rev_list;
 226                 rev_list.data = 0;
 227                 if (start_async(&rev_list))
 228                         die("git upload-pack: unable to fork git-rev-list");
 229                 argv[arg++] = "pack-objects";
 230         } else {
 231                 argv[arg++] = "pack-objects";
 232                 argv[arg++] = "--revs";
 233                 if (create_full_pack)
 234                         argv[arg++] = "--all";
 235                 else if (use_thin_pack)
 236                         argv[arg++] = "--thin";
 237         }
 238
 239         argv[arg++] = "--stdout";
 240         if (!no_progress)
 241                 argv[arg++] = "--progress";
 242         if (use_ofs_delta)
 243                 argv[arg++] = "--delta-base-offset";
 244         if (use_include_tag)
 245                 argv[arg++] = "--include-tag";
 246         argv[arg++] = NULL;
 247
 248         memset(&pack_objects, 0, sizeof(pack_objects));
 249         pack_objects.in = shallow_nr ? rev_list.out : -1;
 250         pack_objects.out = -1;
 251         pack_objects.err = -1;
 252         pack_objects.git_cmd = 1;
 253         pack_objects.argv = argv;
 254
 255         if (start_command(&pack_objects))
 256                 die("git upload-pack: unable to fork git-pack-objects");
 257
 258         /* pass on revisions we (don't) want */
 259         if (!shallow_nr) {
 260                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
 261                 if (!create_full_pack) {
 262                         int i;
 263                         for (i = 0; i < want_obj.nr; i++)
 264                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(want_obj.objects[i].item->sha1));
 265                         fprintf(pipe_fd, "--not\n");
 266                         for (i = 0; i < have_obj.nr; i++)
 267                                 fprintf(pipe_fd, "%s\n", sha1_to_hex(have_obj.objects[i].item->sha1));
 268                 }
 269
 270                 fprintf(pipe_fd, "\n");
 271                 fflush(pipe_fd);
 272                 fclose(pipe_fd);
 273         }
 274
 275
 276         /* We read from pack_objects.err to capture stderr output for
 277          * progress bar, and pack_objects.out to capture the pack data.
 278          */
 279
 280         while (1) {
 281                 struct pollfd pfd[2];
 282                 int pe, pu, pollsize;
 283
 284                 reset_timeout();
 285
 286                 pollsize = 0;
 287                 pe = pu = -1;
 288
 289                 if (0 <= pack_objects.out) {
 290                         pfd[pollsize].fd = pack_objects.out;
 291                         pfd[pollsize].events = POLLIN;
 292                         pu = pollsize;
 293                         pollsize++;
 294                 }
 295                 if (0 <= pack_objects.err) {
 296                         pfd[pollsize].fd = pack_objects.err;
 297                         pfd[pollsize].events = POLLIN;
 298                         pe = pollsize;
 299                         pollsize++;
 300                 }
 301
 302                 if (!pollsize)
 303                         break;
 304
 305                 if (poll(pfd, pollsize, -1) < 0) {
 306                         if (errno != EINTR) {
 307                                 error("poll failed, resuming: %s",
 308                                       strerror(errno));
 309                                 sleep(1);
 310                         }
 311                         continue;
 312                 }
 313                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 314                         /* Status ready; we ship that in the side-band
 315                          * or dump to the standard error.
 316                          */
 317                         sz = xread(pack_objects.err, progress,
 318                                   sizeof(progress));
 319                         if (0 < sz)
 320                                 send_client_data(2, progress, sz);
 321                         else if (sz == 0) {
 322                                 close(pack_objects.err);
 323                                 pack_objects.err = -1;
 324                         }
 325                         else
 326                                 goto fail;
 327                         /* give priority to status messages */
 328                         continue;
 329                 }
 330                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 331                         /* Data ready; we keep the last byte to ourselves
 332                          * in case we detect broken rev-list, so that we
 333                          * can leave the stream corrupted.  This is
 334                          * unfortunate -- unpack-objects would happily
 335                          * accept a valid packdata with trailing garbage,
 336                          * so appending garbage after we pass all the
 337                          * pack data is not good enough to signal
 338                          * breakage to downstream.
 339                          */
 340                         char *cp = data;
 341                         ssize_t outsz = 0;
 342                         if (0 <= buffered) {
 343                                 *cp++ = buffered;
 344                                 outsz++;
 345                         }
 346                         sz = xread(pack_objects.out, cp,
 347                                   sizeof(data) - outsz);
 348                         if (0 < sz)
 349                                 total_sz += sz;
 350                         else if (sz == 0) {
 351                                 close(pack_objects.out);
 352                                 pack_objects.out = -1;
 353                         }
 354                         else
 355                                 goto fail;
 356                         sz += outsz;
 357                         if (1 < sz) {
 358                                 buffered = data[sz-1] & 0xFF;
 359                                 sz--;
 360                         }
 361                         else
 362                                 buffered = -1;
 363                         sz = send_client_data(1, data, sz);
 364                         if (sz < 0)
 365                                 goto fail;
 366                 }
 367         }
 368
 369         if (finish_command(&pack_objects)) {
 370                 error("git upload-pack: git-pack-objects died with error.");
 371                 goto fail;
 372         }
 373         if (shallow_nr && finish_async(&rev_list))
 374                 goto fail;      /* error was already reported */
 375
 376         /* flush the data */
 377         if (0 <= buffered) {
 378                 data[0] = buffered;
 379                 sz = send_client_data(1, data, 1);
 380                 if (sz < 0)
 381                         goto fail;
 382                 fprintf(stderr, "flushed.\n");
 383         }
 384         if (use_sideband)
 385                 packet_flush(1);
 386
 387         gettimeofday(&tv, NULL);
 388         tv.tv_sec -= start_tv.tv_sec;
 389         if (tv.tv_usec < start_tv.tv_usec) {
 390                 tv.tv_sec--;
 391                 tv.tv_usec += 1000000;
 392         }
 393         tv.tv_usec -= start_tv.tv_usec;
 394         if (run_post_upload_pack_hook(total_sz, &tv))
 395                 warning("post-upload-hook failed");
 396         return;
 397
 398  fail:
 399         send_client_data(3, abort_msg, sizeof(abort_msg));
 400         die("git upload-pack: %s", abort_msg);
 401 }
 402
 403 static int got_sha1(char *hex, unsigned char *sha1)
 404 {
 405         struct object *o;
 406         int we_knew_they_have = 0;
 407
 408         if (get_sha1_hex(hex, sha1))
 409                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 410         if (!has_sha1_file(sha1))
 411                 return -1;
 412
 413         o = lookup_object(sha1);
 414         if (!(o && o->parsed))
 415                 o = parse_object(sha1);
 416         if (!o)
 417                 die("oops (%s)", sha1_to_hex(sha1));
 418         if (o->type == OBJ_COMMIT) {
 419                 struct commit_list *parents;
 420                 struct commit *commit = (struct commit *)o;
 421                 if (o->flags & THEY_HAVE)
 422                         we_knew_they_have = 1;
 423                 else
 424                         o->flags |= THEY_HAVE;
 425                 if (!oldest_have || (commit->date < oldest_have))
 426                         oldest_have = commit->date;
 427                 for (parents = commit->parents;
 428                      parents;
 429                      parents = parents->next)
 430                         parents->item->object.flags |= THEY_HAVE;
 431         }
 432         if (!we_knew_they_have) {
 433                 add_object_array(o, NULL, &have_obj);
 434                 return 1;
 435         }
 436         return 0;
 437 }
 438
 439 static int reachable(struct commit *want)
 440 {
 441         struct commit_list *work = NULL;
 442
 443         insert_by_date(want, &work);
 444         while (work) {
 445                 struct commit_list *list = work->next;
 446                 struct commit *commit = work->item;
 447                 free(work);
 448                 work = list;
 449
 450                 if (commit->object.flags & THEY_HAVE) {
 451                         want->object.flags |= COMMON_KNOWN;
 452                         break;
 453                 }
 454                 if (!commit->object.parsed)
 455                         parse_object(commit->object.sha1);
 456                 if (commit->object.flags & REACHABLE)
 457                         continue;
 458                 commit->object.flags |= REACHABLE;
 459                 if (commit->date < oldest_have)
 460                         continue;
 461                 for (list = commit->parents; list; list = list->next) {
 462                         struct commit *parent = list->item;
 463                         if (!(parent->object.flags & REACHABLE))
 464                                 insert_by_date(parent, &work);
 465                 }
 466         }
 467         want->object.flags |= REACHABLE;
 468         clear_commit_marks(want, REACHABLE);
 469         free_commit_list(work);
 470         return (want->object.flags & COMMON_KNOWN);
 471 }
 472
 473 static int ok_to_give_up(void)
 474 {
 475         int i;
 476
 477         if (!have_obj.nr)
 478                 return 0;
 479
 480         for (i = 0; i < want_obj.nr; i++) {
 481                 struct object *want = want_obj.objects[i].item;
 482
 483                 if (want->flags & COMMON_KNOWN)
 484                         continue;
 485                 want = deref_tag(want, "a want line", 0);
 486                 if (!want || want->type != OBJ_COMMIT) {
 487                         /* no way to tell if this is reachable by
 488                          * looking at the ancestry chain alone, so
 489                          * leave a note to ourselves not to worry about
 490                          * this object anymore.
 491                          */
 492                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 493                         continue;
 494                 }
 495                 if (!reachable((struct commit *)want))
 496                         return 0;
 497         }
 498         return 1;
 499 }
 500
 501 static int get_common_commits(void)
 502 {
 503         static char line[1000];
 504         unsigned char sha1[20];
 505         char last_hex[41];
 506
 507         save_commit_buffer = 0;
 508
 509         for (;;) {
 510                 int len = packet_read_line(0, line, sizeof(line));
 511                 reset_timeout();
 512
 513                 if (!len) {
 514                         if (have_obj.nr == 0 || multi_ack)
 515                                 packet_write(1, "NAK\n");
 516                         if (stateless_rpc)
 517                                 exit(0);
 518                         continue;
 519                 }
 520                 strip(line, len);
 521                 if (!prefixcmp(line, "have ")) {
 522                         switch (got_sha1(line+5, sha1)) {
 523                         case -1: /* they have what we do not */
 524                                 if (multi_ack && ok_to_give_up()) {
 525                                         const char *hex = sha1_to_hex(sha1);
 526                                         if (multi_ack == 2)
 527                                                 packet_write(1, "ACK %s ready\n", hex);
 528                                         else
 529                                                 packet_write(1, "ACK %s continue\n", hex);
 530                                 }
 531                                 break;
 532                         default:
 533                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 534                                 if (multi_ack == 2)
 535                                         packet_write(1, "ACK %s common\n", last_hex);
 536                                 else if (multi_ack)
 537                                         packet_write(1, "ACK %s continue\n", last_hex);
 538                                 else if (have_obj.nr == 1)
 539                                         packet_write(1, "ACK %s\n", last_hex);
 540                                 break;
 541                         }
 542                         continue;
 543                 }
 544                 if (!strcmp(line, "done")) {
 545                         if (have_obj.nr > 0) {
 546                                 if (multi_ack)
 547                                         packet_write(1, "ACK %s\n", last_hex);
 548                                 return 0;
 549                         }
 550                         packet_write(1, "NAK\n");
 551                         return -1;
 552                 }
 553                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 554         }
 555 }
 556
 557 static void receive_needs(void)
 558 {
 559         struct object_array shallows = {0, 0, NULL};
 560         static char line[1000];
 561         int len, depth = 0;
 562
 563         shallow_nr = 0;
 564         if (debug_fd)
 565                 write_str_in_full(debug_fd, "#S\n");
 566         for (;;) {
 567                 struct object *o;
 568                 unsigned char sha1_buf[20];
 569                 len = packet_read_line(0, line, sizeof(line));
 570                 reset_timeout();
 571                 if (!len)
 572                         break;
 573                 if (debug_fd)
 574                         write_in_full(debug_fd, line, len);
 575
 576                 if (!prefixcmp(line, "shallow ")) {
 577                         unsigned char sha1[20];
 578                         struct object *object;
 579                         if (get_sha1(line + 8, sha1))
 580                                 die("invalid shallow line: %s", line);
 581                         object = parse_object(sha1);
 582                         if (!object)
 583                                 die("did not find object for %s", line);
 584                         object->flags |= CLIENT_SHALLOW;
 585                         add_object_array(object, NULL, &shallows);
 586                         continue;
 587                 }
 588                 if (!prefixcmp(line, "deepen ")) {
 589                         char *end;
 590                         depth = strtol(line + 7, &end, 0);
 591                         if (end == line + 7 || depth <= 0)
 592                                 die("Invalid deepen: %s", line);
 593                         continue;
 594                 }
 595                 if (prefixcmp(line, "want ") ||
 596                     get_sha1_hex(line+5, sha1_buf))
 597                         die("git upload-pack: protocol error, "
 598                             "expected to get sha, not '%s'", line);
 599                 if (strstr(line+45, "multi_ack_detailed"))
 600                         multi_ack = 2;
 601                 else if (strstr(line+45, "multi_ack"))
 602                         multi_ack = 1;
 603                 if (strstr(line+45, "thin-pack"))
 604                         use_thin_pack = 1;
 605                 if (strstr(line+45, "ofs-delta"))
 606                         use_ofs_delta = 1;
 607                 if (strstr(line+45, "side-band-64k"))
 608                         use_sideband = LARGE_PACKET_MAX;
 609                 else if (strstr(line+45, "side-band"))
 610                         use_sideband = DEFAULT_PACKET_MAX;
 611                 if (strstr(line+45, "no-progress"))
 612                         no_progress = 1;
 613                 if (strstr(line+45, "include-tag"))
 614                         use_include_tag = 1;
 615
 616                 /* We have sent all our refs already, and the other end
 617                  * should have chosen out of them; otherwise they are
 618                  * asking for nonsense.
 619                  *
 620                  * Hmph.  We may later want to allow "want" line that
 621                  * asks for something like "master~10" (symbolic)...
 622                  * would it make sense?  I don't know.
 623                  */
 624                 o = lookup_object(sha1_buf);
 625                 if (!o || !(o->flags & OUR_REF))
 626                         die("git upload-pack: not our ref %s", line+5);
 627                 if (!(o->flags & WANTED)) {
 628                         o->flags |= WANTED;
 629                         add_object_array(o, NULL, &want_obj);
 630                 }
 631         }
 632         if (debug_fd)
 633                 write_str_in_full(debug_fd, "#E\n");
 634
 635         if (!use_sideband && daemon_mode)
 636                 no_progress = 1;
 637
 638         if (depth == 0 && shallows.nr == 0)
 639                 return;
 640         if (depth > 0) {
 641                 struct commit_list *result, *backup;
 642                 int i;
 643                 backup = result = get_shallow_commits(&want_obj, depth,
 644                         SHALLOW, NOT_SHALLOW);
 645                 while (result) {
 646                         struct object *object = &result->item->object;
 647                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 648                                 packet_write(1, "shallow %s",
 649                                                 sha1_to_hex(object->sha1));
 650                                 register_shallow(object->sha1);
 651                                 shallow_nr++;
 652                         }
 653                         result = result->next;
 654                 }
 655                 free_commit_list(backup);
 656                 for (i = 0; i < shallows.nr; i++) {
 657                         struct object *object = shallows.objects[i].item;
 658                         if (object->flags & NOT_SHALLOW) {
 659                                 struct commit_list *parents;
 660                                 packet_write(1, "unshallow %s",
 661                                         sha1_to_hex(object->sha1));
 662                                 object->flags &= ~CLIENT_SHALLOW;
 663                                 /* make sure the real parents are parsed */
 664                                 unregister_shallow(object->sha1);
 665                                 object->parsed = 0;
 666                                 if (parse_commit((struct commit *)object))
 667                                         die("invalid commit");
 668                                 parents = ((struct commit *)object)->parents;
 669                                 while (parents) {
 670                                         add_object_array(&parents->item->object,
 671                                                         NULL, &want_obj);
 672                                         parents = parents->next;
 673                                 }
 674                                 add_object_array(object, NULL, &extra_edge_obj);
 675                         }
 676                         /* make sure commit traversal conforms to client */
 677                         register_shallow(object->sha1);
 678                 }
 679                 packet_flush(1);
 680         } else
 681                 if (shallows.nr > 0) {
 682                         int i;
 683                         for (i = 0; i < shallows.nr; i++)
 684                                 register_shallow(shallows.objects[i].item->sha1);
 685                 }
 686
 687         shallow_nr += shallows.nr;
 688         free(shallows.objects);
 689 }
 690
 691 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 692 {
 693         static const char *capabilities = "multi_ack thin-pack side-band"
 694                 " side-band-64k ofs-delta shallow no-progress"
 695                 " include-tag multi_ack_detailed";
 696         struct object *o = parse_object(sha1);
 697
 698         if (!o)
 699                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 700
 701         if (capabilities)
 702                 packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
 703                         0, capabilities);
 704         else
 705                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
 706         capabilities = NULL;
 707         if (!(o->flags & OUR_REF)) {
 708                 o->flags |= OUR_REF;
 709                 nr_our_refs++;
 710         }
 711         if (o->type == OBJ_TAG) {
 712                 o = deref_tag(o, refname, 0);
 713                 if (o)
 714                         packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
 715         }
 716         return 0;
 717 }
 718
 719 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 720 {
 721         struct object *o = parse_object(sha1);
 722         if (!o)
 723                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 724         if (!(o->flags & OUR_REF)) {
 725                 o->flags |= OUR_REF;
 726                 nr_our_refs++;
 727         }
 728         return 0;
 729 }
 730
 731 static void upload_pack(void)
 732 {
 733         if (advertise_refs || !stateless_rpc) {
 734                 reset_timeout();
 735                 head_ref(send_ref, NULL);
 736                 for_each_ref(send_ref, NULL);
 737                 packet_flush(1);
 738         } else {
 739                 head_ref(mark_our_ref, NULL);
 740                 for_each_ref(mark_our_ref, NULL);
 741         }
 742         if (advertise_refs)
 743                 return;
 744
 745         receive_needs();
 746         if (want_obj.nr) {
 747                 get_common_commits();
 748                 create_pack_file();
 749         }
 750 }
 751
 752 int main(int argc, char **argv)
 753 {
 754         char *dir;
 755         int i;
 756         int strict = 0;
 757
 758         git_extract_argv0_path(argv[0]);
 759         read_replace_refs = 0;
 760
 761         for (i = 1; i < argc; i++) {
 762                 char *arg = argv[i];
 763
 764                 if (arg[0] != '-')
 765                         break;
 766                 if (!strcmp(arg, "--advertise-refs")) {
 767                         advertise_refs = 1;
 768                         continue;
 769                 }
 770                 if (!strcmp(arg, "--stateless-rpc")) {
 771                         stateless_rpc = 1;
 772                         continue;
 773                 }
 774                 if (!strcmp(arg, "--strict")) {
 775                         strict = 1;
 776                         continue;
 777                 }
 778                 if (!prefixcmp(arg, "--timeout=")) {
 779                         timeout = atoi(arg+10);
 780                         daemon_mode = 1;
 781                         continue;
 782                 }
 783                 if (!strcmp(arg, "--")) {
 784                         i++;
 785                         break;
 786                 }
 787         }
 788
 789         if (i != argc-1)
 790                 usage(upload_pack_usage);
 791
 792         setup_path();
 793
 794         dir = argv[i];
 795
 796         if (!enter_repo(dir, strict))
 797                 die("'%s' does not appear to be a git repository", dir);
 798         if (is_repository_shallow())
 799                 die("attempt to fetch/clone from a shallow repository");
 800         if (getenv("GIT_DEBUG_SEND_PACK"))
 801                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
 802         upload_pack();
 803         return 0;
 804 }