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 /* 0 for no sideband,
  44  * otherwise maximum packet size (up to 65520 bytes).
  45  */
  46 static int use_sideband;
  47 static int debug_fd;
  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 int strip(char *line, int len)
  57 {
  58         if (len && line[len-1] == '\n')
  59                 line[--len] = 0;
  60         return len;
  61 }
  62
  63 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  64 {
  65         if (use_sideband)
  66                 return send_sideband(1, fd, data, sz, use_sideband);
  67         if (fd == 3)
  68                 /* emergency quit */
  69                 fd = 2;
  70         if (fd == 2) {
  71                 /* XXX: are we happy to lose stuff here? */
  72                 xwrite(fd, data, sz);
  73                 return sz;
  74         }
  75         return safe_write(fd, data, sz);
  76 }
  77
  78 static FILE *pack_pipe = NULL;
  79 static void show_commit(struct commit *commit, void *data)
  80 {
  81         if (commit->object.flags & BOUNDARY)
  82                 fputc('-', pack_pipe);
  83         if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
  84                 die("broken output pipe");
  85         fputc('\n', pack_pipe);
  86         fflush(pack_pipe);
  87         free(commit->buffer);
  88         commit->buffer = NULL;
  89 }
  90
  91 static void show_object(struct object *obj,
  92                         const struct name_path *path, const char *component,
  93                         void *cb_data)
  94 {
  95         show_object_with_name(pack_pipe, obj, path, component);
  96 }
  97
  98 static void show_edge(struct commit *commit)
  99 {
 100         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
 101 }
 102
 103 static int do_rev_list(int in, int out, void *user_data)
 104 {
 105         int i;
 106         struct rev_info revs;
 107
 108         pack_pipe = xfdopen(out, "w");
 109         init_revisions(&revs, NULL);
 110         revs.tag_objects = 1;
 111         revs.tree_objects = 1;
 112         revs.blob_objects = 1;
 113         if (use_thin_pack)
 114                 revs.edge_hint = 1;
 115
 116         for (i = 0; i < want_obj.nr; i++) {
 117                 struct object *o = want_obj.objects[i].item;
 118                 /* why??? */
 119                 o->flags &= ~UNINTERESTING;
 120                 add_pending_object(&revs, o, NULL);
 121         }
 122         for (i = 0; i < have_obj.nr; i++) {
 123                 struct object *o = have_obj.objects[i].item;
 124                 o->flags |= UNINTERESTING;
 125                 add_pending_object(&revs, o, NULL);
 126         }
 127         setup_revisions(0, NULL, &revs, NULL);
 128         if (prepare_revision_walk(&revs))
 129                 die("revision walk setup failed");
 130         mark_edges_uninteresting(revs.commits, &revs, show_edge);
 131         if (use_thin_pack)
 132                 for (i = 0; i < extra_edge_obj.nr; i++)
 133                         fprintf(pack_pipe, "-%s\n", sha1_to_hex(
 134                                         extra_edge_obj.objects[i].item->sha1));
 135         traverse_commit_list(&revs, show_commit, show_object, NULL);
 136         fflush(pack_pipe);
 137         fclose(pack_pipe);
 138         return 0;
 139 }
 140
 141 static void create_pack_file(void)
 142 {
 143         struct async rev_list;
 144         struct child_process pack_objects;
 145         char data[8193], progress[128];
 146         char abort_msg[] = "aborting due to possible repository "
 147                 "corruption on the remote side.";
 148         int buffered = -1;
 149         ssize_t sz;
 150         const char *argv[10];
 151         int arg = 0;
 152
 153         argv[arg++] = "pack-objects";
 154         if (!shallow_nr) {
 155                 argv[arg++] = "--revs";
 156                 if (use_thin_pack)
 157                         argv[arg++] = "--thin";
 158         }
 159
 160         argv[arg++] = "--stdout";
 161         if (!no_progress)
 162                 argv[arg++] = "--progress";
 163         if (use_ofs_delta)
 164                 argv[arg++] = "--delta-base-offset";
 165         if (use_include_tag)
 166                 argv[arg++] = "--include-tag";
 167         argv[arg++] = NULL;
 168
 169         memset(&pack_objects, 0, sizeof(pack_objects));
 170         pack_objects.in = -1;
 171         pack_objects.out = -1;
 172         pack_objects.err = -1;
 173         pack_objects.git_cmd = 1;
 174         pack_objects.argv = argv;
 175
 176         if (start_command(&pack_objects))
 177                 die("git upload-pack: unable to fork git-pack-objects");
 178
 179         if (shallow_nr) {
 180                 memset(&rev_list, 0, sizeof(rev_list));
 181                 rev_list.proc = do_rev_list;
 182                 rev_list.out = pack_objects.in;
 183                 if (start_async(&rev_list))
 184                         die("git upload-pack: unable to fork git-rev-list");
 185         }
 186         else {
 187                 FILE *pipe_fd = xfdopen(pack_objects.in, "w");
 188                 int i;
 189
 190                 for (i = 0; i < want_obj.nr; i++)
 191                         fprintf(pipe_fd, "%s\n",
 192                                 sha1_to_hex(want_obj.objects[i].item->sha1));
 193                 fprintf(pipe_fd, "--not\n");
 194                 for (i = 0; i < have_obj.nr; i++)
 195                         fprintf(pipe_fd, "%s\n",
 196                                 sha1_to_hex(have_obj.objects[i].item->sha1));
 197                 fprintf(pipe_fd, "\n");
 198                 fflush(pipe_fd);
 199                 fclose(pipe_fd);
 200         }
 201
 202
 203         /* We read from pack_objects.err to capture stderr output for
 204          * progress bar, and pack_objects.out to capture the pack data.
 205          */
 206
 207         while (1) {
 208                 struct pollfd pfd[2];
 209                 int pe, pu, pollsize;
 210
 211                 reset_timeout();
 212
 213                 pollsize = 0;
 214                 pe = pu = -1;
 215
 216                 if (0 <= pack_objects.out) {
 217                         pfd[pollsize].fd = pack_objects.out;
 218                         pfd[pollsize].events = POLLIN;
 219                         pu = pollsize;
 220                         pollsize++;
 221                 }
 222                 if (0 <= pack_objects.err) {
 223                         pfd[pollsize].fd = pack_objects.err;
 224                         pfd[pollsize].events = POLLIN;
 225                         pe = pollsize;
 226                         pollsize++;
 227                 }
 228
 229                 if (!pollsize)
 230                         break;
 231
 232                 if (poll(pfd, pollsize, -1) < 0) {
 233                         if (errno != EINTR) {
 234                                 error("poll failed, resuming: %s",
 235                                       strerror(errno));
 236                                 sleep(1);
 237                         }
 238                         continue;
 239                 }
 240                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 241                         /* Status ready; we ship that in the side-band
 242                          * or dump to the standard error.
 243                          */
 244                         sz = xread(pack_objects.err, progress,
 245                                   sizeof(progress));
 246                         if (0 < sz)
 247                                 send_client_data(2, progress, sz);
 248                         else if (sz == 0) {
 249                                 close(pack_objects.err);
 250                                 pack_objects.err = -1;
 251                         }
 252                         else
 253                                 goto fail;
 254                         /* give priority to status messages */
 255                         continue;
 256                 }
 257                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 258                         /* Data ready; we keep the last byte to ourselves
 259                          * in case we detect broken rev-list, so that we
 260                          * can leave the stream corrupted.  This is
 261                          * unfortunate -- unpack-objects would happily
 262                          * accept a valid packdata with trailing garbage,
 263                          * so appending garbage after we pass all the
 264                          * pack data is not good enough to signal
 265                          * breakage to downstream.
 266                          */
 267                         char *cp = data;
 268                         ssize_t outsz = 0;
 269                         if (0 <= buffered) {
 270                                 *cp++ = buffered;
 271                                 outsz++;
 272                         }
 273                         sz = xread(pack_objects.out, cp,
 274                                   sizeof(data) - outsz);
 275                         if (0 < sz)
 276                                 ;
 277                         else if (sz == 0) {
 278                                 close(pack_objects.out);
 279                                 pack_objects.out = -1;
 280                         }
 281                         else
 282                                 goto fail;
 283                         sz += outsz;
 284                         if (1 < sz) {
 285                                 buffered = data[sz-1] & 0xFF;
 286                                 sz--;
 287                         }
 288                         else
 289                                 buffered = -1;
 290                         sz = send_client_data(1, data, sz);
 291                         if (sz < 0)
 292                                 goto fail;
 293                 }
 294         }
 295
 296         if (finish_command(&pack_objects)) {
 297                 error("git upload-pack: git-pack-objects died with error.");
 298                 goto fail;
 299         }
 300         if (shallow_nr && finish_async(&rev_list))
 301                 goto fail;      /* error was already reported */
 302
 303         /* flush the data */
 304         if (0 <= buffered) {
 305                 data[0] = buffered;
 306                 sz = send_client_data(1, data, 1);
 307                 if (sz < 0)
 308                         goto fail;
 309                 fprintf(stderr, "flushed.\n");
 310         }
 311         if (use_sideband)
 312                 packet_flush(1);
 313         return;
 314
 315  fail:
 316         send_client_data(3, abort_msg, sizeof(abort_msg));
 317         die("git upload-pack: %s", abort_msg);
 318 }
 319
 320 static int got_sha1(char *hex, unsigned char *sha1)
 321 {
 322         struct object *o;
 323         int we_knew_they_have = 0;
 324
 325         if (get_sha1_hex(hex, sha1))
 326                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 327         if (!has_sha1_file(sha1))
 328                 return -1;
 329
 330         o = parse_object(sha1);
 331         if (!o)
 332                 die("oops (%s)", sha1_to_hex(sha1));
 333         if (o->type == OBJ_COMMIT) {
 334                 struct commit_list *parents;
 335                 struct commit *commit = (struct commit *)o;
 336                 if (o->flags & THEY_HAVE)
 337                         we_knew_they_have = 1;
 338                 else
 339                         o->flags |= THEY_HAVE;
 340                 if (!oldest_have || (commit->date < oldest_have))
 341                         oldest_have = commit->date;
 342                 for (parents = commit->parents;
 343                      parents;
 344                      parents = parents->next)
 345                         parents->item->object.flags |= THEY_HAVE;
 346         }
 347         if (!we_knew_they_have) {
 348                 add_object_array(o, NULL, &have_obj);
 349                 return 1;
 350         }
 351         return 0;
 352 }
 353
 354 static int reachable(struct commit *want)
 355 {
 356         struct commit_list *work = NULL;
 357
 358         commit_list_insert_by_date(want, &work);
 359         while (work) {
 360                 struct commit_list *list = work->next;
 361                 struct commit *commit = work->item;
 362                 free(work);
 363                 work = list;
 364
 365                 if (commit->object.flags & THEY_HAVE) {
 366                         want->object.flags |= COMMON_KNOWN;
 367                         break;
 368                 }
 369                 if (!commit->object.parsed)
 370                         parse_object(commit->object.sha1);
 371                 if (commit->object.flags & REACHABLE)
 372                         continue;
 373                 commit->object.flags |= REACHABLE;
 374                 if (commit->date < oldest_have)
 375                         continue;
 376                 for (list = commit->parents; list; list = list->next) {
 377                         struct commit *parent = list->item;
 378                         if (!(parent->object.flags & REACHABLE))
 379                                 commit_list_insert_by_date(parent, &work);
 380                 }
 381         }
 382         want->object.flags |= REACHABLE;
 383         clear_commit_marks(want, REACHABLE);
 384         free_commit_list(work);
 385         return (want->object.flags & COMMON_KNOWN);
 386 }
 387
 388 static int ok_to_give_up(void)
 389 {
 390         int i;
 391
 392         if (!have_obj.nr)
 393                 return 0;
 394
 395         for (i = 0; i < want_obj.nr; i++) {
 396                 struct object *want = want_obj.objects[i].item;
 397
 398                 if (want->flags & COMMON_KNOWN)
 399                         continue;
 400                 want = deref_tag(want, "a want line", 0);
 401                 if (!want || want->type != OBJ_COMMIT) {
 402                         /* no way to tell if this is reachable by
 403                          * looking at the ancestry chain alone, so
 404                          * leave a note to ourselves not to worry about
 405                          * this object anymore.
 406                          */
 407                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 408                         continue;
 409                 }
 410                 if (!reachable((struct commit *)want))
 411                         return 0;
 412         }
 413         return 1;
 414 }
 415
 416 static int get_common_commits(void)
 417 {
 418         static char line[1000];
 419         unsigned char sha1[20];
 420         char last_hex[41];
 421         int got_common = 0;
 422         int got_other = 0;
 423         int sent_ready = 0;
 424
 425         save_commit_buffer = 0;
 426
 427         for (;;) {
 428                 int len = packet_read_line(0, line, sizeof(line));
 429                 reset_timeout();
 430
 431                 if (!len) {
 432                         if (multi_ack == 2 && got_common
 433                             && !got_other && ok_to_give_up()) {
 434                                 sent_ready = 1;
 435                                 packet_write(1, "ACK %s ready\n", last_hex);
 436                         }
 437                         if (have_obj.nr == 0 || multi_ack)
 438                                 packet_write(1, "NAK\n");
 439
 440                         if (no_done && sent_ready) {
 441                                 packet_write(1, "ACK %s\n", last_hex);
 442                                 return 0;
 443                         }
 444                         if (stateless_rpc)
 445                                 exit(0);
 446                         got_common = 0;
 447                         got_other = 0;
 448                         continue;
 449                 }
 450                 strip(line, len);
 451                 if (!prefixcmp(line, "have ")) {
 452                         switch (got_sha1(line+5, sha1)) {
 453                         case -1: /* they have what we do not */
 454                                 got_other = 1;
 455                                 if (multi_ack && ok_to_give_up()) {
 456                                         const char *hex = sha1_to_hex(sha1);
 457                                         if (multi_ack == 2) {
 458                                                 sent_ready = 1;
 459                                                 packet_write(1, "ACK %s ready\n", hex);
 460                                         } else
 461                                                 packet_write(1, "ACK %s continue\n", hex);
 462                                 }
 463                                 break;
 464                         default:
 465                                 got_common = 1;
 466                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 467                                 if (multi_ack == 2)
 468                                         packet_write(1, "ACK %s common\n", last_hex);
 469                                 else if (multi_ack)
 470                                         packet_write(1, "ACK %s continue\n", last_hex);
 471                                 else if (have_obj.nr == 1)
 472                                         packet_write(1, "ACK %s\n", last_hex);
 473                                 break;
 474                         }
 475                         continue;
 476                 }
 477                 if (!strcmp(line, "done")) {
 478                         if (have_obj.nr > 0) {
 479                                 if (multi_ack)
 480                                         packet_write(1, "ACK %s\n", last_hex);
 481                                 return 0;
 482                         }
 483                         packet_write(1, "NAK\n");
 484                         return -1;
 485                 }
 486                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 487         }
 488 }
 489
 490 static int is_our_ref(struct object *o)
 491 {
 492         return o->flags &
 493                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 494 }
 495
 496 static void check_non_tip(void)
 497 {
 498         static const char *argv[] = {
 499                 "rev-list", "--stdin", NULL,
 500         };
 501         static struct child_process cmd;
 502         struct object *o;
 503         char namebuf[42]; /* ^ + SHA-1 + LF */
 504         int i;
 505
 506         /* In the normal in-process case non-tip request can never happen */
 507         if (!stateless_rpc)
 508                 goto error;
 509
 510         cmd.argv = argv;
 511         cmd.git_cmd = 1;
 512         cmd.no_stderr = 1;
 513         cmd.in = -1;
 514         cmd.out = -1;
 515
 516         if (start_command(&cmd))
 517                 goto error;
 518
 519         /*
 520          * If rev-list --stdin encounters an unknown commit, it
 521          * terminates, which will cause SIGPIPE in the write loop
 522          * below.
 523          */
 524         sigchain_push(SIGPIPE, SIG_IGN);
 525
 526         namebuf[0] = '^';
 527         namebuf[41] = '\n';
 528         for (i = get_max_object_index(); 0 < i; ) {
 529                 o = get_indexed_object(--i);
 530                 if (!o)
 531                         continue;
 532                 if (!is_our_ref(o))
 533                         continue;
 534                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 535                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 536                         goto error;
 537         }
 538         namebuf[40] = '\n';
 539         for (i = 0; i < want_obj.nr; i++) {
 540                 o = want_obj.objects[i].item;
 541                 if (is_our_ref(o))
 542                         continue;
 543                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 544                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 545                         goto error;
 546         }
 547         close(cmd.in);
 548
 549         sigchain_pop(SIGPIPE);
 550
 551         /*
 552          * The commits out of the rev-list are not ancestors of
 553          * our ref.
 554          */
 555         i = read_in_full(cmd.out, namebuf, 1);
 556         if (i)
 557                 goto error;
 558         close(cmd.out);
 559
 560         /*
 561          * rev-list may have died by encountering a bad commit
 562          * in the history, in which case we do want to bail out
 563          * even when it showed no commit.
 564          */
 565         if (finish_command(&cmd))
 566                 goto error;
 567
 568         /* All the non-tip ones are ancestors of what we advertised */
 569         return;
 570
 571 error:
 572         /* Pick one of them (we know there at least is one) */
 573         for (i = 0; i < want_obj.nr; i++) {
 574                 o = want_obj.objects[i].item;
 575                 if (!is_our_ref(o))
 576                         die("git upload-pack: not our ref %s",
 577                             sha1_to_hex(o->sha1));
 578         }
 579 }
 580
 581 static void receive_needs(void)
 582 {
 583         struct object_array shallows = OBJECT_ARRAY_INIT;
 584         static char line[1000];
 585         int len, depth = 0;
 586         int has_non_tip = 0;
 587
 588         shallow_nr = 0;
 589         if (debug_fd)
 590                 write_str_in_full(debug_fd, "#S\n");
 591         for (;;) {
 592                 struct object *o;
 593                 const char *features;
 594                 unsigned char sha1_buf[20];
 595                 len = packet_read_line(0, line, sizeof(line));
 596                 reset_timeout();
 597                 if (!len)
 598                         break;
 599                 if (debug_fd)
 600                         write_in_full(debug_fd, line, len);
 601
 602                 if (!prefixcmp(line, "shallow ")) {
 603                         unsigned char sha1[20];
 604                         struct object *object;
 605                         if (get_sha1(line + 8, sha1))
 606                                 die("invalid shallow line: %s", line);
 607                         object = parse_object(sha1);
 608                         if (!object)
 609                                 die("did not find object for %s", line);
 610                         if (object->type != OBJ_COMMIT)
 611                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 612                         object->flags |= CLIENT_SHALLOW;
 613                         add_object_array(object, NULL, &shallows);
 614                         continue;
 615                 }
 616                 if (!prefixcmp(line, "deepen ")) {
 617                         char *end;
 618                         depth = strtol(line + 7, &end, 0);
 619                         if (end == line + 7 || depth <= 0)
 620                                 die("Invalid deepen: %s", line);
 621                         continue;
 622                 }
 623                 if (prefixcmp(line, "want ") ||
 624                     get_sha1_hex(line+5, sha1_buf))
 625                         die("git upload-pack: protocol error, "
 626                             "expected to get sha, not '%s'", line);
 627
 628                 features = line + 45;
 629
 630                 if (parse_feature_request(features, "multi_ack_detailed"))
 631                         multi_ack = 2;
 632                 else if (parse_feature_request(features, "multi_ack"))
 633                         multi_ack = 1;
 634                 if (parse_feature_request(features, "no-done"))
 635                         no_done = 1;
 636                 if (parse_feature_request(features, "thin-pack"))
 637                         use_thin_pack = 1;
 638                 if (parse_feature_request(features, "ofs-delta"))
 639                         use_ofs_delta = 1;
 640                 if (parse_feature_request(features, "side-band-64k"))
 641                         use_sideband = LARGE_PACKET_MAX;
 642                 else if (parse_feature_request(features, "side-band"))
 643                         use_sideband = DEFAULT_PACKET_MAX;
 644                 if (parse_feature_request(features, "no-progress"))
 645                         no_progress = 1;
 646                 if (parse_feature_request(features, "include-tag"))
 647                         use_include_tag = 1;
 648
 649                 o = parse_object(sha1_buf);
 650                 if (!o)
 651                         die("git upload-pack: not our ref %s",
 652                             sha1_to_hex(sha1_buf));
 653                 if (!(o->flags & WANTED)) {
 654                         o->flags |= WANTED;
 655                         if (!is_our_ref(o))
 656                                 has_non_tip = 1;
 657                         add_object_array(o, NULL, &want_obj);
 658                 }
 659         }
 660         if (debug_fd)
 661                 write_str_in_full(debug_fd, "#E\n");
 662
 663         /*
 664          * We have sent all our refs already, and the other end
 665          * should have chosen out of them. When we are operating
 666          * in the stateless RPC mode, however, their choice may
 667          * have been based on the set of older refs advertised
 668          * by another process that handled the initial request.
 669          */
 670         if (has_non_tip)
 671                 check_non_tip();
 672
 673         if (!use_sideband && daemon_mode)
 674                 no_progress = 1;
 675
 676         if (depth == 0 && shallows.nr == 0)
 677                 return;
 678         if (depth > 0) {
 679                 struct commit_list *result = NULL, *backup = NULL;
 680                 int i;
 681                 if (depth == INFINITE_DEPTH)
 682                         for (i = 0; i < shallows.nr; i++) {
 683                                 struct object *object = shallows.objects[i].item;
 684                                 object->flags |= NOT_SHALLOW;
 685                         }
 686                 else
 687                         backup = result =
 688                                 get_shallow_commits(&want_obj, depth,
 689                                                     SHALLOW, NOT_SHALLOW);
 690                 while (result) {
 691                         struct object *object = &result->item->object;
 692                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 693                                 packet_write(1, "shallow %s",
 694                                                 sha1_to_hex(object->sha1));
 695                                 register_shallow(object->sha1);
 696                                 shallow_nr++;
 697                         }
 698                         result = result->next;
 699                 }
 700                 free_commit_list(backup);
 701                 for (i = 0; i < shallows.nr; i++) {
 702                         struct object *object = shallows.objects[i].item;
 703                         if (object->flags & NOT_SHALLOW) {
 704                                 struct commit_list *parents;
 705                                 packet_write(1, "unshallow %s",
 706                                         sha1_to_hex(object->sha1));
 707                                 object->flags &= ~CLIENT_SHALLOW;
 708                                 /* make sure the real parents are parsed */
 709                                 unregister_shallow(object->sha1);
 710                                 object->parsed = 0;
 711                                 if (parse_commit((struct commit *)object))
 712                                         die("invalid commit");
 713                                 parents = ((struct commit *)object)->parents;
 714                                 while (parents) {
 715                                         add_object_array(&parents->item->object,
 716                                                         NULL, &want_obj);
 717                                         parents = parents->next;
 718                                 }
 719                                 add_object_array(object, NULL, &extra_edge_obj);
 720                         }
 721                         /* make sure commit traversal conforms to client */
 722                         register_shallow(object->sha1);
 723                 }
 724                 packet_flush(1);
 725         } else
 726                 if (shallows.nr > 0) {
 727                         int i;
 728                         for (i = 0; i < shallows.nr; i++)
 729                                 register_shallow(shallows.objects[i].item->sha1);
 730                 }
 731
 732         shallow_nr += shallows.nr;
 733         free(shallows.objects);
 734 }
 735
 736 /* return non-zero if the ref is hidden, otherwise 0 */
 737 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 738 {
 739         struct object *o = lookup_unknown_object(sha1);
 740
 741         if (ref_is_hidden(refname)) {
 742                 o->flags |= HIDDEN_REF;
 743                 return 1;
 744         }
 745         if (!o)
 746                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 747         o->flags |= OUR_REF;
 748         return 0;
 749 }
 750
 751 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 752 {
 753         static const char *capabilities = "multi_ack thin-pack side-band"
 754                 " side-band-64k ofs-delta shallow no-progress"
 755                 " include-tag multi_ack_detailed";
 756         const char *refname_nons = strip_namespace(refname);
 757         unsigned char peeled[20];
 758
 759         if (mark_our_ref(refname, sha1, flag, cb_data))
 760                 return 0;
 761
 762         if (capabilities)
 763                 packet_write(1, "%s %s%c%s%s%s agent=%s\n",
 764                              sha1_to_hex(sha1), refname_nons,
 765                              0, capabilities,
 766                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 767                              stateless_rpc ? " no-done" : "",
 768                              git_user_agent_sanitized());
 769         else
 770                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 771         capabilities = NULL;
 772         if (!peel_ref(refname, peeled))
 773                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 774         return 0;
 775 }
 776
 777 static void upload_pack(void)
 778 {
 779         if (advertise_refs || !stateless_rpc) {
 780                 reset_timeout();
 781                 head_ref_namespaced(send_ref, NULL);
 782                 for_each_namespaced_ref(send_ref, NULL);
 783                 packet_flush(1);
 784         } else {
 785                 head_ref_namespaced(mark_our_ref, NULL);
 786                 for_each_namespaced_ref(mark_our_ref, NULL);
 787         }
 788         if (advertise_refs)
 789                 return;
 790
 791         receive_needs();
 792         if (want_obj.nr) {
 793                 get_common_commits();
 794                 create_pack_file();
 795         }
 796 }
 797
 798 static int upload_pack_config(const char *var, const char *value, void *unused)
 799 {
 800         if (!strcmp("uploadpack.allowtipsha1inwant", var))
 801                 allow_tip_sha1_in_want = git_config_bool(var, value);
 802         return parse_hide_refs_config(var, value, "uploadpack");
 803 }
 804
 805 int main(int argc, char **argv)
 806 {
 807         char *dir;
 808         int i;
 809         int strict = 0;
 810
 811         git_setup_gettext();
 812
 813         packet_trace_identity("upload-pack");
 814         git_extract_argv0_path(argv[0]);
 815         read_replace_refs = 0;
 816
 817         for (i = 1; i < argc; i++) {
 818                 char *arg = argv[i];
 819
 820                 if (arg[0] != '-')
 821                         break;
 822                 if (!strcmp(arg, "--advertise-refs")) {
 823                         advertise_refs = 1;
 824                         continue;
 825                 }
 826                 if (!strcmp(arg, "--stateless-rpc")) {
 827                         stateless_rpc = 1;
 828                         continue;
 829                 }
 830                 if (!strcmp(arg, "--strict")) {
 831                         strict = 1;
 832                         continue;
 833                 }
 834                 if (!prefixcmp(arg, "--timeout=")) {
 835                         timeout = atoi(arg+10);
 836                         daemon_mode = 1;
 837                         continue;
 838                 }
 839                 if (!strcmp(arg, "--")) {
 840                         i++;
 841                         break;
 842                 }
 843         }
 844
 845         if (i != argc-1)
 846                 usage(upload_pack_usage);
 847
 848         setup_path();
 849
 850         dir = argv[i];
 851
 852         if (!enter_repo(dir, strict))
 853                 die("'%s' does not appear to be a git repository", dir);
 854         if (is_repository_shallow())
 855                 die("attempt to fetch/clone from a shallow repository");
 856         git_config(upload_pack_config, NULL);
 857         if (getenv("GIT_DEBUG_SEND_PACK"))
 858                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
 859         upload_pack();
 860         return 0;
 861 }