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 = lookup_object(sha1);
 331         if (!(o && o->parsed))
 332                 o = parse_object(sha1);
 333         if (!o)
 334                 die("oops (%s)", sha1_to_hex(sha1));
 335         if (o->type == OBJ_COMMIT) {
 336                 struct commit_list *parents;
 337                 struct commit *commit = (struct commit *)o;
 338                 if (o->flags & THEY_HAVE)
 339                         we_knew_they_have = 1;
 340                 else
 341                         o->flags |= THEY_HAVE;
 342                 if (!oldest_have || (commit->date < oldest_have))
 343                         oldest_have = commit->date;
 344                 for (parents = commit->parents;
 345                      parents;
 346                      parents = parents->next)
 347                         parents->item->object.flags |= THEY_HAVE;
 348         }
 349         if (!we_knew_they_have) {
 350                 add_object_array(o, NULL, &have_obj);
 351                 return 1;
 352         }
 353         return 0;
 354 }
 355
 356 static int reachable(struct commit *want)
 357 {
 358         struct commit_list *work = NULL;
 359
 360         commit_list_insert_by_date(want, &work);
 361         while (work) {
 362                 struct commit_list *list = work->next;
 363                 struct commit *commit = work->item;
 364                 free(work);
 365                 work = list;
 366
 367                 if (commit->object.flags & THEY_HAVE) {
 368                         want->object.flags |= COMMON_KNOWN;
 369                         break;
 370                 }
 371                 if (!commit->object.parsed)
 372                         parse_object(commit->object.sha1);
 373                 if (commit->object.flags & REACHABLE)
 374                         continue;
 375                 commit->object.flags |= REACHABLE;
 376                 if (commit->date < oldest_have)
 377                         continue;
 378                 for (list = commit->parents; list; list = list->next) {
 379                         struct commit *parent = list->item;
 380                         if (!(parent->object.flags & REACHABLE))
 381                                 commit_list_insert_by_date(parent, &work);
 382                 }
 383         }
 384         want->object.flags |= REACHABLE;
 385         clear_commit_marks(want, REACHABLE);
 386         free_commit_list(work);
 387         return (want->object.flags & COMMON_KNOWN);
 388 }
 389
 390 static int ok_to_give_up(void)
 391 {
 392         int i;
 393
 394         if (!have_obj.nr)
 395                 return 0;
 396
 397         for (i = 0; i < want_obj.nr; i++) {
 398                 struct object *want = want_obj.objects[i].item;
 399
 400                 if (want->flags & COMMON_KNOWN)
 401                         continue;
 402                 want = deref_tag(want, "a want line", 0);
 403                 if (!want || want->type != OBJ_COMMIT) {
 404                         /* no way to tell if this is reachable by
 405                          * looking at the ancestry chain alone, so
 406                          * leave a note to ourselves not to worry about
 407                          * this object anymore.
 408                          */
 409                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 410                         continue;
 411                 }
 412                 if (!reachable((struct commit *)want))
 413                         return 0;
 414         }
 415         return 1;
 416 }
 417
 418 static int get_common_commits(void)
 419 {
 420         static char line[1000];
 421         unsigned char sha1[20];
 422         char last_hex[41];
 423         int got_common = 0;
 424         int got_other = 0;
 425         int sent_ready = 0;
 426
 427         save_commit_buffer = 0;
 428
 429         for (;;) {
 430                 int len = packet_read_line(0, line, sizeof(line));
 431                 reset_timeout();
 432
 433                 if (!len) {
 434                         if (multi_ack == 2 && got_common
 435                             && !got_other && ok_to_give_up()) {
 436                                 sent_ready = 1;
 437                                 packet_write(1, "ACK %s ready\n", last_hex);
 438                         }
 439                         if (have_obj.nr == 0 || multi_ack)
 440                                 packet_write(1, "NAK\n");
 441
 442                         if (no_done && sent_ready) {
 443                                 packet_write(1, "ACK %s\n", last_hex);
 444                                 return 0;
 445                         }
 446                         if (stateless_rpc)
 447                                 exit(0);
 448                         got_common = 0;
 449                         got_other = 0;
 450                         continue;
 451                 }
 452                 strip(line, len);
 453                 if (!prefixcmp(line, "have ")) {
 454                         switch (got_sha1(line+5, sha1)) {
 455                         case -1: /* they have what we do not */
 456                                 got_other = 1;
 457                                 if (multi_ack && ok_to_give_up()) {
 458                                         const char *hex = sha1_to_hex(sha1);
 459                                         if (multi_ack == 2) {
 460                                                 sent_ready = 1;
 461                                                 packet_write(1, "ACK %s ready\n", hex);
 462                                         } else
 463                                                 packet_write(1, "ACK %s continue\n", hex);
 464                                 }
 465                                 break;
 466                         default:
 467                                 got_common = 1;
 468                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 469                                 if (multi_ack == 2)
 470                                         packet_write(1, "ACK %s common\n", last_hex);
 471                                 else if (multi_ack)
 472                                         packet_write(1, "ACK %s continue\n", last_hex);
 473                                 else if (have_obj.nr == 1)
 474                                         packet_write(1, "ACK %s\n", last_hex);
 475                                 break;
 476                         }
 477                         continue;
 478                 }
 479                 if (!strcmp(line, "done")) {
 480                         if (have_obj.nr > 0) {
 481                                 if (multi_ack)
 482                                         packet_write(1, "ACK %s\n", last_hex);
 483                                 return 0;
 484                         }
 485                         packet_write(1, "NAK\n");
 486                         return -1;
 487                 }
 488                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 489         }
 490 }
 491
 492 static int is_our_ref(struct object *o)
 493 {
 494         return o->flags &
 495                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 496 }
 497
 498 static void check_non_tip(void)
 499 {
 500         static const char *argv[] = {
 501                 "rev-list", "--stdin", NULL,
 502         };
 503         static struct child_process cmd;
 504         struct object *o;
 505         char namebuf[42]; /* ^ + SHA-1 + LF */
 506         int i;
 507
 508         /* In the normal in-process case non-tip request can never happen */
 509         if (!stateless_rpc)
 510                 goto error;
 511
 512         cmd.argv = argv;
 513         cmd.git_cmd = 1;
 514         cmd.no_stderr = 1;
 515         cmd.in = -1;
 516         cmd.out = -1;
 517
 518         if (start_command(&cmd))
 519                 goto error;
 520
 521         /*
 522          * If rev-list --stdin encounters an unknown commit, it
 523          * terminates, which will cause SIGPIPE in the write loop
 524          * below.
 525          */
 526         sigchain_push(SIGPIPE, SIG_IGN);
 527
 528         namebuf[0] = '^';
 529         namebuf[41] = '\n';
 530         for (i = get_max_object_index(); 0 < i; ) {
 531                 o = get_indexed_object(--i);
 532                 if (!o)
 533                         continue;
 534                 if (!is_our_ref(o))
 535                         continue;
 536                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 537                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 538                         goto error;
 539         }
 540         namebuf[40] = '\n';
 541         for (i = 0; i < want_obj.nr; i++) {
 542                 o = want_obj.objects[i].item;
 543                 if (is_our_ref(o))
 544                         continue;
 545                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 546                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 547                         goto error;
 548         }
 549         close(cmd.in);
 550
 551         sigchain_pop(SIGPIPE);
 552
 553         /*
 554          * The commits out of the rev-list are not ancestors of
 555          * our ref.
 556          */
 557         i = read_in_full(cmd.out, namebuf, 1);
 558         if (i)
 559                 goto error;
 560         close(cmd.out);
 561
 562         /*
 563          * rev-list may have died by encountering a bad commit
 564          * in the history, in which case we do want to bail out
 565          * even when it showed no commit.
 566          */
 567         if (finish_command(&cmd))
 568                 goto error;
 569
 570         /* All the non-tip ones are ancestors of what we advertised */
 571         return;
 572
 573 error:
 574         /* Pick one of them (we know there at least is one) */
 575         for (i = 0; i < want_obj.nr; i++) {
 576                 o = want_obj.objects[i].item;
 577                 if (!is_our_ref(o))
 578                         die("git upload-pack: not our ref %s",
 579                             sha1_to_hex(o->sha1));
 580         }
 581 }
 582
 583 static void receive_needs(void)
 584 {
 585         struct object_array shallows = OBJECT_ARRAY_INIT;
 586         static char line[1000];
 587         int len, depth = 0;
 588         int has_non_tip = 0;
 589
 590         shallow_nr = 0;
 591         if (debug_fd)
 592                 write_str_in_full(debug_fd, "#S\n");
 593         for (;;) {
 594                 struct object *o;
 595                 const char *features;
 596                 unsigned char sha1_buf[20];
 597                 len = packet_read_line(0, line, sizeof(line));
 598                 reset_timeout();
 599                 if (!len)
 600                         break;
 601                 if (debug_fd)
 602                         write_in_full(debug_fd, line, len);
 603
 604                 if (!prefixcmp(line, "shallow ")) {
 605                         unsigned char sha1[20];
 606                         struct object *object;
 607                         if (get_sha1(line + 8, sha1))
 608                                 die("invalid shallow line: %s", line);
 609                         object = parse_object(sha1);
 610                         if (!object)
 611                                 die("did not find object for %s", line);
 612                         if (object->type != OBJ_COMMIT)
 613                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 614                         object->flags |= CLIENT_SHALLOW;
 615                         add_object_array(object, NULL, &shallows);
 616                         continue;
 617                 }
 618                 if (!prefixcmp(line, "deepen ")) {
 619                         char *end;
 620                         depth = strtol(line + 7, &end, 0);
 621                         if (end == line + 7 || depth <= 0)
 622                                 die("Invalid deepen: %s", line);
 623                         continue;
 624                 }
 625                 if (prefixcmp(line, "want ") ||
 626                     get_sha1_hex(line+5, sha1_buf))
 627                         die("git upload-pack: protocol error, "
 628                             "expected to get sha, not '%s'", line);
 629
 630                 features = line + 45;
 631
 632                 if (parse_feature_request(features, "multi_ack_detailed"))
 633                         multi_ack = 2;
 634                 else if (parse_feature_request(features, "multi_ack"))
 635                         multi_ack = 1;
 636                 if (parse_feature_request(features, "no-done"))
 637                         no_done = 1;
 638                 if (parse_feature_request(features, "thin-pack"))
 639                         use_thin_pack = 1;
 640                 if (parse_feature_request(features, "ofs-delta"))
 641                         use_ofs_delta = 1;
 642                 if (parse_feature_request(features, "side-band-64k"))
 643                         use_sideband = LARGE_PACKET_MAX;
 644                 else if (parse_feature_request(features, "side-band"))
 645                         use_sideband = DEFAULT_PACKET_MAX;
 646                 if (parse_feature_request(features, "no-progress"))
 647                         no_progress = 1;
 648                 if (parse_feature_request(features, "include-tag"))
 649                         use_include_tag = 1;
 650
 651                 o = lookup_object(sha1_buf);
 652                 if (!o)
 653                         die("git upload-pack: not our ref %s",
 654                             sha1_to_hex(sha1_buf));
 655                 if (!(o->flags & WANTED)) {
 656                         o->flags |= WANTED;
 657                         if (!is_our_ref(o))
 658                                 has_non_tip = 1;
 659                         add_object_array(o, NULL, &want_obj);
 660                 }
 661         }
 662         if (debug_fd)
 663                 write_str_in_full(debug_fd, "#E\n");
 664
 665         /*
 666          * We have sent all our refs already, and the other end
 667          * should have chosen out of them. When we are operating
 668          * in the stateless RPC mode, however, their choice may
 669          * have been based on the set of older refs advertised
 670          * by another process that handled the initial request.
 671          */
 672         if (has_non_tip)
 673                 check_non_tip();
 674
 675         if (!use_sideband && daemon_mode)
 676                 no_progress = 1;
 677
 678         if (depth == 0 && shallows.nr == 0)
 679                 return;
 680         if (depth > 0) {
 681                 struct commit_list *result = NULL, *backup = NULL;
 682                 int i;
 683                 if (depth == INFINITE_DEPTH)
 684                         for (i = 0; i < shallows.nr; i++) {
 685                                 struct object *object = shallows.objects[i].item;
 686                                 object->flags |= NOT_SHALLOW;
 687                         }
 688                 else
 689                         backup = result =
 690                                 get_shallow_commits(&want_obj, depth,
 691                                                     SHALLOW, NOT_SHALLOW);
 692                 while (result) {
 693                         struct object *object = &result->item->object;
 694                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 695                                 packet_write(1, "shallow %s",
 696                                                 sha1_to_hex(object->sha1));
 697                                 register_shallow(object->sha1);
 698                                 shallow_nr++;
 699                         }
 700                         result = result->next;
 701                 }
 702                 free_commit_list(backup);
 703                 for (i = 0; i < shallows.nr; i++) {
 704                         struct object *object = shallows.objects[i].item;
 705                         if (object->flags & NOT_SHALLOW) {
 706                                 struct commit_list *parents;
 707                                 packet_write(1, "unshallow %s",
 708                                         sha1_to_hex(object->sha1));
 709                                 object->flags &= ~CLIENT_SHALLOW;
 710                                 /* make sure the real parents are parsed */
 711                                 unregister_shallow(object->sha1);
 712                                 object->parsed = 0;
 713                                 if (parse_commit((struct commit *)object))
 714                                         die("invalid commit");
 715                                 parents = ((struct commit *)object)->parents;
 716                                 while (parents) {
 717                                         add_object_array(&parents->item->object,
 718                                                         NULL, &want_obj);
 719                                         parents = parents->next;
 720                                 }
 721                                 add_object_array(object, NULL, &extra_edge_obj);
 722                         }
 723                         /* make sure commit traversal conforms to client */
 724                         register_shallow(object->sha1);
 725                 }
 726                 packet_flush(1);
 727         } else
 728                 if (shallows.nr > 0) {
 729                         int i;
 730                         for (i = 0; i < shallows.nr; i++)
 731                                 register_shallow(shallows.objects[i].item->sha1);
 732                 }
 733
 734         shallow_nr += shallows.nr;
 735         free(shallows.objects);
 736 }
 737
 738 /* return non-zero if the ref is hidden, otherwise 0 */
 739 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 740 {
 741         struct object *o = lookup_unknown_object(sha1);
 742
 743         if (ref_is_hidden(refname)) {
 744                 o->flags |= HIDDEN_REF;
 745                 return 1;
 746         }
 747         if (!o)
 748                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 749         o->flags |= OUR_REF;
 750         return 0;
 751 }
 752
 753 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 754 {
 755         static const char *capabilities = "multi_ack thin-pack side-band"
 756                 " side-band-64k ofs-delta shallow no-progress"
 757                 " include-tag multi_ack_detailed";
 758         const char *refname_nons = strip_namespace(refname);
 759         unsigned char peeled[20];
 760
 761         if (mark_our_ref(refname, sha1, flag, cb_data))
 762                 return 0;
 763
 764         if (capabilities)
 765                 packet_write(1, "%s %s%c%s%s%s agent=%s\n",
 766                              sha1_to_hex(sha1), refname_nons,
 767                              0, capabilities,
 768                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 769                              stateless_rpc ? " no-done" : "",
 770                              git_user_agent_sanitized());
 771         else
 772                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 773         capabilities = NULL;
 774         if (!peel_ref(refname, peeled))
 775                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 776         return 0;
 777 }
 778
 779 static void upload_pack(void)
 780 {
 781         if (advertise_refs || !stateless_rpc) {
 782                 reset_timeout();
 783                 head_ref_namespaced(send_ref, NULL);
 784                 for_each_namespaced_ref(send_ref, NULL);
 785                 packet_flush(1);
 786         } else {
 787                 head_ref_namespaced(mark_our_ref, NULL);
 788                 for_each_namespaced_ref(mark_our_ref, NULL);
 789         }
 790         if (advertise_refs)
 791                 return;
 792
 793         receive_needs();
 794         if (want_obj.nr) {
 795                 get_common_commits();
 796                 create_pack_file();
 797         }
 798 }
 799
 800 static int upload_pack_config(const char *var, const char *value, void *unused)
 801 {
 802         if (!strcmp("uploadpack.allowtipsha1inwant", var))
 803                 allow_tip_sha1_in_want = git_config_bool(var, value);
 804         return parse_hide_refs_config(var, value, "uploadpack");
 805 }
 806
 807 int main(int argc, char **argv)
 808 {
 809         char *dir;
 810         int i;
 811         int strict = 0;
 812
 813         git_setup_gettext();
 814
 815         packet_trace_identity("upload-pack");
 816         git_extract_argv0_path(argv[0]);
 817         read_replace_refs = 0;
 818
 819         for (i = 1; i < argc; i++) {
 820                 char *arg = argv[i];
 821
 822                 if (arg[0] != '-')
 823                         break;
 824                 if (!strcmp(arg, "--advertise-refs")) {
 825                         advertise_refs = 1;
 826                         continue;
 827                 }
 828                 if (!strcmp(arg, "--stateless-rpc")) {
 829                         stateless_rpc = 1;
 830                         continue;
 831                 }
 832                 if (!strcmp(arg, "--strict")) {
 833                         strict = 1;
 834                         continue;
 835                 }
 836                 if (!prefixcmp(arg, "--timeout=")) {
 837                         timeout = atoi(arg+10);
 838                         daemon_mode = 1;
 839                         continue;
 840                 }
 841                 if (!strcmp(arg, "--")) {
 842                         i++;
 843                         break;
 844                 }
 845         }
 846
 847         if (i != argc-1)
 848                 usage(upload_pack_usage);
 849
 850         setup_path();
 851
 852         dir = argv[i];
 853
 854         if (!enter_repo(dir, strict))
 855                 die("'%s' does not appear to be a git repository", dir);
 856         if (is_repository_shallow())
 857                 die("attempt to fetch/clone from a shallow repository");
 858         git_config(upload_pack_config, NULL);
 859         if (getenv("GIT_DEBUG_SEND_PACK"))
 860                 debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK"));
 861         upload_pack();
 862         return 0;
 863 }