upload-pack.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "pkt-line.h"
   4 #include "sideband.h"
   5 #include "tag.h"
   6 #include "object.h"
   7 #include "commit.h"
   8 #include "exec_cmd.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "list-objects.h"
  12 #include "run-command.h"
  13 #include "sigchain.h"
  14 #include "version.h"
  15 #include "string-list.h"
  16
  17 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  18
  19 /* bits #0..7 in revision.h, #8..10 in commit.c */
  20 #define THEY_HAVE       (1u << 11)
  21 #define OUR_REF         (1u << 12)
  22 #define WANTED          (1u << 13)
  23 #define COMMON_KNOWN    (1u << 14)
  24 #define REACHABLE       (1u << 15)
  25
  26 #define SHALLOW         (1u << 16)
  27 #define NOT_SHALLOW     (1u << 17)
  28 #define CLIENT_SHALLOW  (1u << 18)
  29 #define HIDDEN_REF      (1u << 19)
  30
  31 static unsigned long oldest_have;
  32
  33 static int multi_ack;
  34 static int no_done;
  35 static int use_thin_pack, use_ofs_delta, use_include_tag;
  36 static int no_progress, daemon_mode;
  37 static int allow_tip_sha1_in_want;
  38 static int shallow_nr;
  39 static struct object_array have_obj;
  40 static struct object_array want_obj;
  41 static struct object_array extra_edge_obj;
  42 static unsigned int timeout;
  43 static int keepalive = -1;
  44 /* 0 for no sideband,
  45  * otherwise maximum packet size (up to 65520 bytes).
  46  */
  47 static int use_sideband;
  48 static int advertise_refs;
  49 static int stateless_rpc;
  50
  51 static void reset_timeout(void)
  52 {
  53         alarm(timeout);
  54 }
  55
  56 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  57 {
  58         if (use_sideband)
  59                 return send_sideband(1, fd, data, sz, use_sideband);
  60         if (fd == 3)
  61                 /* emergency quit */
  62                 fd = 2;
  63         if (fd == 2) {
  64                 /* XXX: are we happy to lose stuff here? */
  65                 xwrite(fd, data, sz);
  66                 return sz;
  67         }
  68         write_or_die(fd, data, sz);
  69         return 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,
  86                         const struct name_path *path, const char *component,
  87                         void *cb_data)
  88 {
  89         show_object_with_name(pack_pipe, obj, path, component);
  90 }
  91
  92 static void show_edge(struct commit *commit)
  93 {
  94         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
  95 }
  96
  97 static int do_rev_list(int in, int out, void *user_data)
  98 {
  99         int i;
 100         struct rev_info revs;
 101
 102         pack_pipe = xfdopen(out, "w");
 103         init_revisions(&revs, NULL);
 104         revs.tag_objects = 1;
 105         revs.tree_objects = 1;
 106         revs.blob_objects = 1;
 107         if (use_thin_pack)
 108                 revs.edge_hint = 1;
 109
 110         for (i = 0; i < want_obj.nr; i++) {
 111                 struct object *o = want_obj.objects[i].item;
 112                 /* why??? */
 113                 o->flags &= ~UNINTERESTING;
 114                 add_pending_object(&revs, o, NULL);
 115         }
 116         for (i = 0; i < have_obj.nr; i++) {
 117                 struct object *o = have_obj.objects[i].item;
 118                 o->flags |= UNINTERESTING;
 119                 add_pending_object(&revs, o, NULL);
 120         }
 121         setup_revisions(0, NULL, &revs, NULL);
 122         if (prepare_revision_walk(&revs))
 123                 die("revision walk setup failed");
 124         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 125         if (use_thin_pack)
 126                 for (i = 0; i < extra_edge_obj.nr; i++)
 127                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
 128                                         extra_edge_obj.objects[i].item->sha1));
 129         traverse_commit_list(&revs, show_commit, show_object, NULL);
 130         fflush(pack_pipe);
 131         fclose(pack_pipe);
 132         return 0;
 133 }
 134
 135 static void create_pack_file(void)
 136 {
 137         struct async rev_list;
 138         struct child_process pack_objects;
 139         char data[8193], progress[128];
 140         char abort_msg[] = "aborting due to possible repository "
 141                 "corruption on the remote side.";
 142         int buffered = -1;
 143         ssize_t sz;
 144         const char *argv[10];
 145         int arg = 0;
 146
 147         argv[arg++] = "pack-objects";
 148         if (!shallow_nr) {
 149                 argv[arg++] = "--revs";
 150                 if (use_thin_pack)
 151                         argv[arg++] = "--thin";
 152         }
 153
 154         argv[arg++] = "--stdout";
 155         if (!no_progress)
 156                 argv[arg++] = "--progress";
 157         if (use_ofs_delta)
 158                 argv[arg++] = "--delta-base-offset";
 159         if (use_include_tag)
 160                 argv[arg++] = "--include-tag";
 161         argv[arg++] = NULL;
 162
 163         memset(&pack_objects, 0, sizeof(pack_objects));
 164         pack_objects.in = -1;
 165         pack_objects.out = -1;
 166         pack_objects.err = -1;
 167         pack_objects.git_cmd = 1;
 168         pack_objects.argv = argv;
 169
 170         if (start_command(&pack_objects))
 171                 die("git upload-pack: unable to fork git-pack-objects");
 172
 173         if (shallow_nr) {
 174                 memset(&rev_list, 0, sizeof(rev_list));
 175                 rev_list.proc = do_rev_list;
 176                 rev_list.out = pack_objects.in;
 177                 if (start_async(&rev_list))
 178                         die("git upload-pack: unable to fork git-rev-list");
 179         }
 180         else {
 181                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
 182                 int i;
 183
 184                 for (i = 0; i < want_obj.nr; i++)
 185                         fprintf(pipe_fd, "%s\n",
 186                                 sha1_to_hex(want_obj.objects[i].item->sha1));
 187                 fprintf(pipe_fd, "--not\n");
 188                 for (i = 0; i < have_obj.nr; i++)
 189                         fprintf(pipe_fd, "%s\n",
 190                                 sha1_to_hex(have_obj.objects[i].item->sha1));
 191                 fprintf(pipe_fd, "\n");
 192                 fflush(pipe_fd);
 193                 fclose(pipe_fd);
 194         }
 195
 196
 197         /* We read from pack_objects.err to capture stderr output for
 198          * progress bar, and pack_objects.out to capture the pack data.
 199          */
 200
 201         while (1) {
 202                 struct pollfd pfd[2];
 203                 int pe, pu, pollsize;
 204                 int ret;
 205
 206                 reset_timeout();
 207
 208                 pollsize = 0;
 209                 pe = pu = -1;
 210
 211                 if (0 <= pack_objects.out) {
 212                         pfd[pollsize].fd = pack_objects.out;
 213                         pfd[pollsize].events = POLLIN;
 214                         pu = pollsize;
 215                         pollsize++;
 216                 }
 217                 if (0 <= pack_objects.err) {
 218                         pfd[pollsize].fd = pack_objects.err;
 219                         pfd[pollsize].events = POLLIN;
 220                         pe = pollsize;
 221                         pollsize++;
 222                 }
 223
 224                 if (!pollsize)
 225                         break;
 226
 227                 ret = poll(pfd, pollsize, 1000 * keepalive);
 228                 if (ret < 0) {
 229                         if (errno != EINTR) {
 230                                 error("poll failed, resuming: %s",
 231                                       strerror(errno));
 232                                 sleep(1);
 233                         }
 234                         continue;
 235                 }
 236                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 237                         /* Status ready; we ship that in the side-band
 238                          * or dump to the standard error.
 239                          */
 240                         sz = xread(pack_objects.err, progress,
 241                                   sizeof(progress));
 242                         if (0 < sz)
 243                                 send_client_data(2, progress, sz);
 244                         else if (sz == 0) {
 245                                 close(pack_objects.err);
 246                                 pack_objects.err = -1;
 247                         }
 248                         else
 249                                 goto fail;
 250                         /* give priority to status messages */
 251                         continue;
 252                 }
 253                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 254                         /* Data ready; we keep the last byte to ourselves
 255                          * in case we detect broken rev-list, so that we
 256                          * can leave the stream corrupted.  This is
 257                          * unfortunate -- unpack-objects would happily
 258                          * accept a valid packdata with trailing garbage,
 259                          * so appending garbage after we pass all the
 260                          * pack data is not good enough to signal
 261                          * breakage to downstream.
 262                          */
 263                         char *cp = data;
 264                         ssize_t outsz = 0;
 265                         if (0 <= buffered) {
 266                                 *cp++ = buffered;
 267                                 outsz++;
 268                         }
 269                         sz = xread(pack_objects.out, cp,
 270                                   sizeof(data) - outsz);
 271                         if (0 < sz)
 272                                 ;
 273                         else if (sz == 0) {
 274                                 close(pack_objects.out);
 275                                 pack_objects.out = -1;
 276                         }
 277                         else
 278                                 goto fail;
 279                         sz += outsz;
 280                         if (1 < sz) {
 281                                 buffered = data[sz-1] & 0xFF;
 282                                 sz--;
 283                         }
 284                         else
 285                                 buffered = -1;
 286                         sz = send_client_data(1, data, sz);
 287                         if (sz < 0)
 288                                 goto fail;
 289                 }
 290
 291                 /*
 292                  * We hit the keepalive timeout without saying anything; send
 293                  * an empty message on the data sideband just to let the other
 294                  * side know we're still working on it, but don't have any data
 295                  * yet.
 296                  *
 297                  * If we don't have a sideband channel, there's no room in the
 298                  * protocol to say anything, so those clients are just out of
 299                  * luck.
 300                  */
 301                 if (!ret && use_sideband) {
 302                         static const char buf[] = "0005\1";
 303                         write_or_die(1, buf, 5);
 304                 }
 305         }
 306
 307         if (finish_command(&pack_objects)) {
 308                 error("git upload-pack: git-pack-objects died with error.");
 309                 goto fail;
 310         }
 311         if (shallow_nr && finish_async(&rev_list))
 312                 goto fail;      /* error was already reported */
 313
 314         /* flush the data */
 315         if (0 <= buffered) {
 316                 data[0] = buffered;
 317                 sz = send_client_data(1, data, 1);
 318                 if (sz < 0)
 319                         goto fail;
 320                 fprintf(stderr, "flushed.\n");
 321         }
 322         if (use_sideband)
 323                 packet_flush(1);
 324         return;
 325
 326  fail:
 327         send_client_data(3, abort_msg, sizeof(abort_msg));
 328         die("git upload-pack: %s", abort_msg);
 329 }
 330
 331 static int got_sha1(char *hex, unsigned char *sha1)
 332 {
 333         struct object *o;
 334         int we_knew_they_have = 0;
 335
 336         if (get_sha1_hex(hex, sha1))
 337                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 338         if (!has_sha1_file(sha1))
 339                 return -1;
 340
 341         o = parse_object(sha1);
 342         if (!o)
 343                 die("oops (%s)", sha1_to_hex(sha1));
 344         if (o->type == OBJ_COMMIT) {
 345                 struct commit_list *parents;
 346                 struct commit *commit = (struct commit *)o;
 347                 if (o->flags & THEY_HAVE)
 348                         we_knew_they_have = 1;
 349                 else
 350                         o->flags |= THEY_HAVE;
 351                 if (!oldest_have || (commit->date < oldest_have))
 352                         oldest_have = commit->date;
 353                 for (parents = commit->parents;
 354                      parents;
 355                      parents = parents->next)
 356                         parents->item->object.flags |= THEY_HAVE;
 357         }
 358         if (!we_knew_they_have) {
 359                 add_object_array(o, NULL, &have_obj);
 360                 return 1;
 361         }
 362         return 0;
 363 }
 364
 365 static int reachable(struct commit *want)
 366 {
 367         struct commit_list *work = NULL;
 368
 369         commit_list_insert_by_date(want, &work);
 370         while (work) {
 371                 struct commit_list *list = work->next;
 372                 struct commit *commit = work->item;
 373                 free(work);
 374                 work = list;
 375
 376                 if (commit->object.flags & THEY_HAVE) {
 377                         want->object.flags |= COMMON_KNOWN;
 378                         break;
 379                 }
 380                 if (!commit->object.parsed)
 381                         parse_object(commit->object.sha1);
 382                 if (commit->object.flags & REACHABLE)
 383                         continue;
 384                 commit->object.flags |= REACHABLE;
 385                 if (commit->date < oldest_have)
 386                         continue;
 387                 for (list = commit->parents; list; list = list->next) {
 388                         struct commit *parent = list->item;
 389                         if (!(parent->object.flags & REACHABLE))
 390                                 commit_list_insert_by_date(parent, &work);
 391                 }
 392         }
 393         want->object.flags |= REACHABLE;
 394         clear_commit_marks(want, REACHABLE);
 395         free_commit_list(work);
 396         return (want->object.flags & COMMON_KNOWN);
 397 }
 398
 399 static int ok_to_give_up(void)
 400 {
 401         int i;
 402
 403         if (!have_obj.nr)
 404                 return 0;
 405
 406         for (i = 0; i < want_obj.nr; i++) {
 407                 struct object *want = want_obj.objects[i].item;
 408
 409                 if (want->flags & COMMON_KNOWN)
 410                         continue;
 411                 want = deref_tag(want, "a want line", 0);
 412                 if (!want || want->type != OBJ_COMMIT) {
 413                         /* no way to tell if this is reachable by
 414                          * looking at the ancestry chain alone, so
 415                          * leave a note to ourselves not to worry about
 416                          * this object anymore.
 417                          */
 418                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 419                         continue;
 420                 }
 421                 if (!reachable((struct commit *)want))
 422                         return 0;
 423         }
 424         return 1;
 425 }
 426
 427 static int get_common_commits(void)
 428 {
 429         unsigned char sha1[20];
 430         char last_hex[41];
 431         int got_common = 0;
 432         int got_other = 0;
 433         int sent_ready = 0;
 434
 435         save_commit_buffer = 0;
 436
 437         for (;;) {
 438                 char *line = packet_read_line(0, NULL);
 439                 reset_timeout();
 440
 441                 if (!line) {
 442                         if (multi_ack == 2 && got_common
 443                             && !got_other && ok_to_give_up()) {
 444                                 sent_ready = 1;
 445                                 packet_write(1, "ACK %s ready\n", last_hex);
 446                         }
 447                         if (have_obj.nr == 0 || multi_ack)
 448                                 packet_write(1, "NAK\n");
 449
 450                         if (no_done && sent_ready) {
 451                                 packet_write(1, "ACK %s\n", last_hex);
 452                                 return 0;
 453                         }
 454                         if (stateless_rpc)
 455                                 exit(0);
 456                         got_common = 0;
 457                         got_other = 0;
 458                         continue;
 459                 }
 460                 if (!prefixcmp(line, "have ")) {
 461                         switch (got_sha1(line+5, sha1)) {
 462                         case -1: /* they have what we do not */
 463                                 got_other = 1;
 464                                 if (multi_ack && ok_to_give_up()) {
 465                                         const char *hex = sha1_to_hex(sha1);
 466                                         if (multi_ack == 2) {
 467                                                 sent_ready = 1;
 468                                                 packet_write(1, "ACK %s ready\n", hex);
 469                                         } else
 470                                                 packet_write(1, "ACK %s continue\n", hex);
 471                                 }
 472                                 break;
 473                         default:
 474                                 got_common = 1;
 475                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 476                                 if (multi_ack == 2)
 477                                         packet_write(1, "ACK %s common\n", last_hex);
 478                                 else if (multi_ack)
 479                                         packet_write(1, "ACK %s continue\n", last_hex);
 480                                 else if (have_obj.nr == 1)
 481                                         packet_write(1, "ACK %s\n", last_hex);
 482                                 break;
 483                         }
 484                         continue;
 485                 }
 486                 if (!strcmp(line, "done")) {
 487                         if (have_obj.nr > 0) {
 488                                 if (multi_ack)
 489                                         packet_write(1, "ACK %s\n", last_hex);
 490                                 return 0;
 491                         }
 492                         packet_write(1, "NAK\n");
 493                         return -1;
 494                 }
 495                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 496         }
 497 }
 498
 499 static int is_our_ref(struct object *o)
 500 {
 501         return o->flags &
 502                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 503 }
 504
 505 static void check_non_tip(void)
 506 {
 507         static const char *argv[] = {
 508                 "rev-list", "--stdin", NULL,
 509         };
 510         static struct child_process cmd;
 511         struct object *o;
 512         char namebuf[42]; /* ^ + SHA-1 + LF */
 513         int i;
 514
 515         /* In the normal in-process case non-tip request can never happen */
 516         if (!stateless_rpc)
 517                 goto error;
 518
 519         cmd.argv = argv;
 520         cmd.git_cmd = 1;
 521         cmd.no_stderr = 1;
 522         cmd.in = -1;
 523         cmd.out = -1;
 524
 525         if (start_command(&cmd))
 526                 goto error;
 527
 528         /*
 529          * If rev-list --stdin encounters an unknown commit, it
 530          * terminates, which will cause SIGPIPE in the write loop
 531          * below.
 532          */
 533         sigchain_push(SIGPIPE, SIG_IGN);
 534
 535         namebuf[0] = '^';
 536         namebuf[41] = '\n';
 537         for (i = get_max_object_index(); 0 < i; ) {
 538                 o = get_indexed_object(--i);
 539                 if (!o)
 540                         continue;
 541                 if (!is_our_ref(o))
 542                         continue;
 543                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 544                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 545                         goto error;
 546         }
 547         namebuf[40] = '\n';
 548         for (i = 0; i < want_obj.nr; i++) {
 549                 o = want_obj.objects[i].item;
 550                 if (is_our_ref(o))
 551                         continue;
 552                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 553                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 554                         goto error;
 555         }
 556         close(cmd.in);
 557
 558         sigchain_pop(SIGPIPE);
 559
 560         /*
 561          * The commits out of the rev-list are not ancestors of
 562          * our ref.
 563          */
 564         i = read_in_full(cmd.out, namebuf, 1);
 565         if (i)
 566                 goto error;
 567         close(cmd.out);
 568
 569         /*
 570          * rev-list may have died by encountering a bad commit
 571          * in the history, in which case we do want to bail out
 572          * even when it showed no commit.
 573          */
 574         if (finish_command(&cmd))
 575                 goto error;
 576
 577         /* All the non-tip ones are ancestors of what we advertised */
 578         return;
 579
 580 error:
 581         /* Pick one of them (we know there at least is one) */
 582         for (i = 0; i < want_obj.nr; i++) {
 583                 o = want_obj.objects[i].item;
 584                 if (!is_our_ref(o))
 585                         die("git upload-pack: not our ref %s",
 586                             sha1_to_hex(o->sha1));
 587         }
 588 }
 589
 590 static void receive_needs(void)
 591 {
 592         struct object_array shallows = OBJECT_ARRAY_INIT;
 593         int depth = 0;
 594         int has_non_tip = 0;
 595
 596         shallow_nr = 0;
 597         for (;;) {
 598                 struct object *o;
 599                 const char *features;
 600                 unsigned char sha1_buf[20];
 601                 char *line = packet_read_line(0, NULL);
 602                 reset_timeout();
 603                 if (!line)
 604                         break;
 605
 606                 if (!prefixcmp(line, "shallow ")) {
 607                         unsigned char sha1[20];
 608                         struct object *object;
 609                         if (get_sha1_hex(line + 8, sha1))
 610                                 die("invalid shallow line: %s", line);
 611                         object = parse_object(sha1);
 612                         if (!object)
 613                                 die("did not find object for %s", line);
 614                         if (object->type != OBJ_COMMIT)
 615                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 616                         if (!(object->flags & CLIENT_SHALLOW)) {
 617                                 object->flags |= CLIENT_SHALLOW;
 618                                 add_object_array(object, NULL, &shallows);
 619                         }
 620                         continue;
 621                 }
 622                 if (!prefixcmp(line, "deepen ")) {
 623                         char *end;
 624                         depth = strtol(line + 7, &end, 0);
 625                         if (end == line + 7 || depth <= 0)
 626                                 die("Invalid deepen: %s", line);
 627                         continue;
 628                 }
 629                 if (prefixcmp(line, "want ") ||
 630                     get_sha1_hex(line+5, sha1_buf))
 631                         die("git upload-pack: protocol error, "
 632                             "expected to get sha, not '%s'", line);
 633
 634                 features = line + 45;
 635
 636                 if (parse_feature_request(features, "multi_ack_detailed"))
 637                         multi_ack = 2;
 638                 else if (parse_feature_request(features, "multi_ack"))
 639                         multi_ack = 1;
 640                 if (parse_feature_request(features, "no-done"))
 641                         no_done = 1;
 642                 if (parse_feature_request(features, "thin-pack"))
 643                         use_thin_pack = 1;
 644                 if (parse_feature_request(features, "ofs-delta"))
 645                         use_ofs_delta = 1;
 646                 if (parse_feature_request(features, "side-band-64k"))
 647                         use_sideband = LARGE_PACKET_MAX;
 648                 else if (parse_feature_request(features, "side-band"))
 649                         use_sideband = DEFAULT_PACKET_MAX;
 650                 if (parse_feature_request(features, "no-progress"))
 651                         no_progress = 1;
 652                 if (parse_feature_request(features, "include-tag"))
 653                         use_include_tag = 1;
 654
 655                 o = parse_object(sha1_buf);
 656                 if (!o)
 657                         die("git upload-pack: not our ref %s",
 658                             sha1_to_hex(sha1_buf));
 659                 if (!(o->flags & WANTED)) {
 660                         o->flags |= WANTED;
 661                         if (!is_our_ref(o))
 662                                 has_non_tip = 1;
 663                         add_object_array(o, NULL, &want_obj);
 664                 }
 665         }
 666
 667         /*
 668          * We have sent all our refs already, and the other end
 669          * should have chosen out of them. When we are operating
 670          * in the stateless RPC mode, however, their choice may
 671          * have been based on the set of older refs advertised
 672          * by another process that handled the initial request.
 673          */
 674         if (has_non_tip)
 675                 check_non_tip();
 676
 677         if (!use_sideband && daemon_mode)
 678                 no_progress = 1;
 679
 680         if (depth == 0 && shallows.nr == 0)
 681                 return;
 682         if (depth > 0) {
 683                 struct commit_list *result = NULL, *backup = NULL;
 684                 int i;
 685                 if (depth == INFINITE_DEPTH)
 686                         for (i = 0; i < shallows.nr; i++) {
 687                                 struct object *object = shallows.objects[i].item;
 688                                 object->flags |= NOT_SHALLOW;
 689                         }
 690                 else
 691                         backup = result =
 692                                 get_shallow_commits(&want_obj, depth,
 693                                                     SHALLOW, NOT_SHALLOW);
 694                 while (result) {
 695                         struct object *object = &result->item->object;
 696                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 697                                 packet_write(1, "shallow %s",
 698                                                 sha1_to_hex(object->sha1));
 699                                 register_shallow(object->sha1);
 700                                 shallow_nr++;
 701                         }
 702                         result = result->next;
 703                 }
 704                 free_commit_list(backup);
 705                 for (i = 0; i < shallows.nr; i++) {
 706                         struct object *object = shallows.objects[i].item;
 707                         if (object->flags & NOT_SHALLOW) {
 708                                 struct commit_list *parents;
 709                                 packet_write(1, "unshallow %s",
 710                                         sha1_to_hex(object->sha1));
 711                                 object->flags &= ~CLIENT_SHALLOW;
 712                                 /* make sure the real parents are parsed */
 713                                 unregister_shallow(object->sha1);
 714                                 object->parsed = 0;
 715                                 if (parse_commit((struct commit *)object))
 716                                         die("invalid commit");
 717                                 parents = ((struct commit *)object)->parents;
 718                                 while (parents) {
 719                                         add_object_array(&parents->item->object,
 720                                                         NULL, &want_obj);
 721                                         parents = parents->next;
 722                                 }
 723                                 add_object_array(object, NULL, &extra_edge_obj);
 724                         }
 725                         /* make sure commit traversal conforms to client */
 726                         register_shallow(object->sha1);
 727                 }
 728                 packet_flush(1);
 729         } else
 730                 if (shallows.nr > 0) {
 731                         int i;
 732                         for (i = 0; i < shallows.nr; i++)
 733                                 register_shallow(shallows.objects[i].item->sha1);
 734                 }
 735
 736         shallow_nr += shallows.nr;
 737         free(shallows.objects);
 738 }
 739
 740 /* return non-zero if the ref is hidden, otherwise 0 */
 741 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 742 {
 743         struct object *o = lookup_unknown_object(sha1);
 744
 745         if (ref_is_hidden(refname)) {
 746                 o->flags |= HIDDEN_REF;
 747                 return 1;
 748         }
 749         if (!o)
 750                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 751         o->flags |= OUR_REF;
 752         return 0;
 753 }
 754
 755 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 756 {
 757         static const char *capabilities = "multi_ack thin-pack side-band"
 758                 " side-band-64k ofs-delta shallow no-progress"
 759                 " include-tag multi_ack_detailed";
 760         const char *refname_nons = strip_namespace(refname);
 761         unsigned char peeled[20];
 762
 763         if (mark_our_ref(refname, sha1, flag, cb_data))
 764                 return 0;
 765
 766         if (capabilities)
 767                 packet_write(1, "%s %s%c%s%s%s agent=%s\n",
 768                              sha1_to_hex(sha1), refname_nons,
 769                              0, capabilities,
 770                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 771                              stateless_rpc ? " no-done" : "",
 772                              git_user_agent_sanitized());
 773         else
 774                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 775         capabilities = NULL;
 776         if (!peel_ref(refname, peeled))
 777                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 778         return 0;
 779 }
 780
 781 static void upload_pack(void)
 782 {
 783         if (advertise_refs || !stateless_rpc) {
 784                 reset_timeout();
 785                 head_ref_namespaced(send_ref, NULL);
 786                 for_each_namespaced_ref(send_ref, NULL);
 787                 packet_flush(1);
 788         } else {
 789                 head_ref_namespaced(mark_our_ref, NULL);
 790                 for_each_namespaced_ref(mark_our_ref, NULL);
 791         }
 792         if (advertise_refs)
 793                 return;
 794
 795         receive_needs();
 796         if (want_obj.nr) {
 797                 get_common_commits();
 798                 create_pack_file();
 799         }
 800 }
 801
 802 static int upload_pack_config(const char *var, const char *value, void *unused)
 803 {
 804         if (!strcmp("uploadpack.allowtipsha1inwant", var))
 805                 allow_tip_sha1_in_want = git_config_bool(var, value);
 806         else if (!strcmp("uploadpack.keepalive", var)) {
 807                 keepalive = git_config_int(var, value);
 808                 if (!keepalive)
 809                         keepalive = -1;
 810         }
 811         return parse_hide_refs_config(var, value, "uploadpack");
 812 }
 813
 814 int main(int argc, char **argv)
 815 {
 816         char *dir;
 817         int i;
 818         int strict = 0;
 819
 820         git_setup_gettext();
 821
 822         packet_trace_identity("upload-pack");
 823         git_extract_argv0_path(argv[0]);
 824         read_replace_refs = 0;
 825
 826         for (i = 1; i < argc; i++) {
 827                 char *arg = argv[i];
 828
 829                 if (arg[0] != '-')
 830                         break;
 831                 if (!strcmp(arg, "--advertise-refs")) {
 832                         advertise_refs = 1;
 833                         continue;
 834                 }
 835                 if (!strcmp(arg, "--stateless-rpc")) {
 836                         stateless_rpc = 1;
 837                         continue;
 838                 }
 839                 if (!strcmp(arg, "--strict")) {
 840                         strict = 1;
 841                         continue;
 842                 }
 843                 if (!prefixcmp(arg, "--timeout=")) {
 844                         timeout = atoi(arg+10);
 845                         daemon_mode = 1;
 846                         continue;
 847                 }
 848                 if (!strcmp(arg, "--")) {
 849                         i++;
 850                         break;
 851                 }
 852         }
 853
 854         if (i != argc-1)
 855                 usage(upload_pack_usage);
 856
 857         setup_path();
 858
 859         dir = argv[i];
 860
 861         if (!enter_repo(dir, strict))
 862                 die("'%s' does not appear to be a git repository", dir);
 863         if (is_repository_shallow())
 864                 die("attempt to fetch/clone from a shallow repository");
 865         git_config(upload_pack_config, NULL);
 866         upload_pack();
 867         return 0;
 868 }