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