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