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 "connect.h"
  14 #include "sigchain.h"
  15 #include "version.h"
  16 #include "string-list.h"
  17
  18 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  19
  20 /* Remember to update object flag allocation in object.h */
  21 #define THEY_HAVE       (1u << 11)
  22 #define OUR_REF         (1u << 12)
  23 #define WANTED          (1u << 13)
  24 #define COMMON_KNOWN    (1u << 14)
  25 #define REACHABLE       (1u << 15)
  26
  27 #define SHALLOW         (1u << 16)
  28 #define NOT_SHALLOW     (1u << 17)
  29 #define CLIENT_SHALLOW  (1u << 18)
  30 #define HIDDEN_REF      (1u << 19)
  31
  32 static unsigned long oldest_have;
  33
  34 static int multi_ack;
  35 static int no_done;
  36 static int use_thin_pack, use_ofs_delta, use_include_tag;
  37 static int no_progress, daemon_mode;
  38 static int allow_tip_sha1_in_want;
  39 static int shallow_nr;
  40 static struct object_array have_obj;
  41 static struct object_array want_obj;
  42 static struct object_array extra_edge_obj;
  43 static unsigned int timeout;
  44 static int keepalive = 5;
  45 /* 0 for no sideband,
  46  * otherwise maximum packet size (up to 65520 bytes).
  47  */
  48 static int use_sideband;
  49 static int advertise_refs;
  50 static int stateless_rpc;
  51
  52 static void reset_timeout(void)
  53 {
  54         alarm(timeout);
  55 }
  56
  57 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  58 {
  59         if (use_sideband)
  60                 return send_sideband(1, fd, data, sz, use_sideband);
  61         if (fd == 3)
  62                 /* emergency quit */
  63                 fd = 2;
  64         if (fd == 2) {
  65                 /* XXX: are we happy to lose stuff here? */
  66                 xwrite(fd, data, sz);
  67                 return sz;
  68         }
  69         write_or_die(fd, data, sz);
  70         return sz;
  71 }
  72
  73 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  74 {
  75         FILE *fp = cb_data;
  76         if (graft->nr_parent == -1)
  77                 fprintf(fp, "--shallow %s\n", sha1_to_hex(graft->sha1));
  78         return 0;
  79 }
  80
  81 static void create_pack_file(void)
  82 {
  83         struct child_process pack_objects = CHILD_PROCESS_INIT;
  84         char data[8193], progress[128];
  85         char abort_msg[] = "aborting due to possible repository "
  86                 "corruption on the remote side.";
  87         int buffered = -1;
  88         ssize_t sz;
  89         const char *argv[12];
  90         int i, arg = 0;
  91         FILE *pipe_fd;
  92
  93         if (shallow_nr) {
  94                 argv[arg++] = "--shallow-file";
  95                 argv[arg++] = "";
  96         }
  97         argv[arg++] = "pack-objects";
  98         argv[arg++] = "--revs";
  99         if (use_thin_pack)
 100                 argv[arg++] = "--thin";
 101
 102         argv[arg++] = "--stdout";
 103         if (!no_progress)
 104                 argv[arg++] = "--progress";
 105         if (use_ofs_delta)
 106                 argv[arg++] = "--delta-base-offset";
 107         if (use_include_tag)
 108                 argv[arg++] = "--include-tag";
 109         argv[arg++] = NULL;
 110
 111         pack_objects.in = -1;
 112         pack_objects.out = -1;
 113         pack_objects.err = -1;
 114         pack_objects.git_cmd = 1;
 115         pack_objects.argv = argv;
 116
 117         if (start_command(&pack_objects))
 118                 die("git upload-pack: unable to fork git-pack-objects");
 119
 120         pipe_fd = xfdopen(pack_objects.in, "w");
 121
 122         if (shallow_nr)
 123                 for_each_commit_graft(write_one_shallow, pipe_fd);
 124
 125         for (i = 0; i < want_obj.nr; i++)
 126                 fprintf(pipe_fd, "%s\n",
 127                         sha1_to_hex(want_obj.objects[i].item->sha1));
 128         fprintf(pipe_fd, "--not\n");
 129         for (i = 0; i < have_obj.nr; i++)
 130                 fprintf(pipe_fd, "%s\n",
 131                         sha1_to_hex(have_obj.objects[i].item->sha1));
 132         for (i = 0; i < extra_edge_obj.nr; i++)
 133                 fprintf(pipe_fd, "%s\n",
 134                         sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
 135         fprintf(pipe_fd, "\n");
 136         fflush(pipe_fd);
 137         fclose(pipe_fd);
 138
 139         /* We read from pack_objects.err to capture stderr output for
 140          * progress bar, and pack_objects.out to capture the pack data.
 141          */
 142
 143         while (1) {
 144                 struct pollfd pfd[2];
 145                 int pe, pu, pollsize;
 146                 int ret;
 147
 148                 reset_timeout();
 149
 150                 pollsize = 0;
 151                 pe = pu = -1;
 152
 153                 if (0 <= pack_objects.out) {
 154                         pfd[pollsize].fd = pack_objects.out;
 155                         pfd[pollsize].events = POLLIN;
 156                         pu = pollsize;
 157                         pollsize++;
 158                 }
 159                 if (0 <= pack_objects.err) {
 160                         pfd[pollsize].fd = pack_objects.err;
 161                         pfd[pollsize].events = POLLIN;
 162                         pe = pollsize;
 163                         pollsize++;
 164                 }
 165
 166                 if (!pollsize)
 167                         break;
 168
 169                 ret = poll(pfd, pollsize, 1000 * keepalive);
 170                 if (ret < 0) {
 171                         if (errno != EINTR) {
 172                                 error("poll failed, resuming: %s",
 173                                       strerror(errno));
 174                                 sleep(1);
 175                         }
 176                         continue;
 177                 }
 178                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 179                         /* Status ready; we ship that in the side-band
 180                          * or dump to the standard error.
 181                          */
 182                         sz = xread(pack_objects.err, progress,
 183                                   sizeof(progress));
 184                         if (0 < sz)
 185                                 send_client_data(2, progress, sz);
 186                         else if (sz == 0) {
 187                                 close(pack_objects.err);
 188                                 pack_objects.err = -1;
 189                         }
 190                         else
 191                                 goto fail;
 192                         /* give priority to status messages */
 193                         continue;
 194                 }
 195                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 196                         /* Data ready; we keep the last byte to ourselves
 197                          * in case we detect broken rev-list, so that we
 198                          * can leave the stream corrupted.  This is
 199                          * unfortunate -- unpack-objects would happily
 200                          * accept a valid packdata with trailing garbage,
 201                          * so appending garbage after we pass all the
 202                          * pack data is not good enough to signal
 203                          * breakage to downstream.
 204                          */
 205                         char *cp = data;
 206                         ssize_t outsz = 0;
 207                         if (0 <= buffered) {
 208                                 *cp++ = buffered;
 209                                 outsz++;
 210                         }
 211                         sz = xread(pack_objects.out, cp,
 212                                   sizeof(data) - outsz);
 213                         if (0 < sz)
 214                                 ;
 215                         else if (sz == 0) {
 216                                 close(pack_objects.out);
 217                                 pack_objects.out = -1;
 218                         }
 219                         else
 220                                 goto fail;
 221                         sz += outsz;
 222                         if (1 < sz) {
 223                                 buffered = data[sz-1] & 0xFF;
 224                                 sz--;
 225                         }
 226                         else
 227                                 buffered = -1;
 228                         sz = send_client_data(1, data, sz);
 229                         if (sz < 0)
 230                                 goto fail;
 231                 }
 232
 233                 /*
 234                  * We hit the keepalive timeout without saying anything; send
 235                  * an empty message on the data sideband just to let the other
 236                  * side know we're still working on it, but don't have any data
 237                  * yet.
 238                  *
 239                  * If we don't have a sideband channel, there's no room in the
 240                  * protocol to say anything, so those clients are just out of
 241                  * luck.
 242                  */
 243                 if (!ret && use_sideband) {
 244                         static const char buf[] = "0005\1";
 245                         write_or_die(1, buf, 5);
 246                 }
 247         }
 248
 249         if (finish_command(&pack_objects)) {
 250                 error("git upload-pack: git-pack-objects died with error.");
 251                 goto fail;
 252         }
 253
 254         /* flush the data */
 255         if (0 <= buffered) {
 256                 data[0] = buffered;
 257                 sz = send_client_data(1, data, 1);
 258                 if (sz < 0)
 259                         goto fail;
 260                 fprintf(stderr, "flushed.\n");
 261         }
 262         if (use_sideband)
 263                 packet_flush(1);
 264         return;
 265
 266  fail:
 267         send_client_data(3, abort_msg, sizeof(abort_msg));
 268         die("git upload-pack: %s", abort_msg);
 269 }
 270
 271 static int got_sha1(char *hex, unsigned char *sha1)
 272 {
 273         struct object *o;
 274         int we_knew_they_have = 0;
 275
 276         if (get_sha1_hex(hex, sha1))
 277                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 278         if (!has_sha1_file(sha1))
 279                 return -1;
 280
 281         o = parse_object(sha1);
 282         if (!o)
 283                 die("oops (%s)", sha1_to_hex(sha1));
 284         if (o->type == OBJ_COMMIT) {
 285                 struct commit_list *parents;
 286                 struct commit *commit = (struct commit *)o;
 287                 if (o->flags & THEY_HAVE)
 288                         we_knew_they_have = 1;
 289                 else
 290                         o->flags |= THEY_HAVE;
 291                 if (!oldest_have || (commit->date < oldest_have))
 292                         oldest_have = commit->date;
 293                 for (parents = commit->parents;
 294                      parents;
 295                      parents = parents->next)
 296                         parents->item->object.flags |= THEY_HAVE;
 297         }
 298         if (!we_knew_they_have) {
 299                 add_object_array(o, NULL, &have_obj);
 300                 return 1;
 301         }
 302         return 0;
 303 }
 304
 305 static int reachable(struct commit *want)
 306 {
 307         struct commit_list *work = NULL;
 308
 309         commit_list_insert_by_date(want, &work);
 310         while (work) {
 311                 struct commit_list *list = work->next;
 312                 struct commit *commit = work->item;
 313                 free(work);
 314                 work = list;
 315
 316                 if (commit->object.flags & THEY_HAVE) {
 317                         want->object.flags |= COMMON_KNOWN;
 318                         break;
 319                 }
 320                 if (!commit->object.parsed)
 321                         parse_object(commit->object.sha1);
 322                 if (commit->object.flags & REACHABLE)
 323                         continue;
 324                 commit->object.flags |= REACHABLE;
 325                 if (commit->date < oldest_have)
 326                         continue;
 327                 for (list = commit->parents; list; list = list->next) {
 328                         struct commit *parent = list->item;
 329                         if (!(parent->object.flags & REACHABLE))
 330                                 commit_list_insert_by_date(parent, &work);
 331                 }
 332         }
 333         want->object.flags |= REACHABLE;
 334         clear_commit_marks(want, REACHABLE);
 335         free_commit_list(work);
 336         return (want->object.flags & COMMON_KNOWN);
 337 }
 338
 339 static int ok_to_give_up(void)
 340 {
 341         int i;
 342
 343         if (!have_obj.nr)
 344                 return 0;
 345
 346         for (i = 0; i < want_obj.nr; i++) {
 347                 struct object *want = want_obj.objects[i].item;
 348
 349                 if (want->flags & COMMON_KNOWN)
 350                         continue;
 351                 want = deref_tag(want, "a want line", 0);
 352                 if (!want || want->type != OBJ_COMMIT) {
 353                         /* no way to tell if this is reachable by
 354                          * looking at the ancestry chain alone, so
 355                          * leave a note to ourselves not to worry about
 356                          * this object anymore.
 357                          */
 358                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 359                         continue;
 360                 }
 361                 if (!reachable((struct commit *)want))
 362                         return 0;
 363         }
 364         return 1;
 365 }
 366
 367 static int get_common_commits(void)
 368 {
 369         unsigned char sha1[20];
 370         char last_hex[41];
 371         int got_common = 0;
 372         int got_other = 0;
 373         int sent_ready = 0;
 374
 375         save_commit_buffer = 0;
 376
 377         for (;;) {
 378                 char *line = packet_read_line(0, NULL);
 379                 reset_timeout();
 380
 381                 if (!line) {
 382                         if (multi_ack == 2 && got_common
 383                             && !got_other && ok_to_give_up()) {
 384                                 sent_ready = 1;
 385                                 packet_write(1, "ACK %s ready\n", last_hex);
 386                         }
 387                         if (have_obj.nr == 0 || multi_ack)
 388                                 packet_write(1, "NAK\n");
 389
 390                         if (no_done && sent_ready) {
 391                                 packet_write(1, "ACK %s\n", last_hex);
 392                                 return 0;
 393                         }
 394                         if (stateless_rpc)
 395                                 exit(0);
 396                         got_common = 0;
 397                         got_other = 0;
 398                         continue;
 399                 }
 400                 if (starts_with(line, "have ")) {
 401                         switch (got_sha1(line+5, sha1)) {
 402                         case -1: /* they have what we do not */
 403                                 got_other = 1;
 404                                 if (multi_ack && ok_to_give_up()) {
 405                                         const char *hex = sha1_to_hex(sha1);
 406                                         if (multi_ack == 2) {
 407                                                 sent_ready = 1;
 408                                                 packet_write(1, "ACK %s ready\n", hex);
 409                                         } else
 410                                                 packet_write(1, "ACK %s continue\n", hex);
 411                                 }
 412                                 break;
 413                         default:
 414                                 got_common = 1;
 415                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 416                                 if (multi_ack == 2)
 417                                         packet_write(1, "ACK %s common\n", last_hex);
 418                                 else if (multi_ack)
 419                                         packet_write(1, "ACK %s continue\n", last_hex);
 420                                 else if (have_obj.nr == 1)
 421                                         packet_write(1, "ACK %s\n", last_hex);
 422                                 break;
 423                         }
 424                         continue;
 425                 }
 426                 if (!strcmp(line, "done")) {
 427                         if (have_obj.nr > 0) {
 428                                 if (multi_ack)
 429                                         packet_write(1, "ACK %s\n", last_hex);
 430                                 return 0;
 431                         }
 432                         packet_write(1, "NAK\n");
 433                         return -1;
 434                 }
 435                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 436         }
 437 }
 438
 439 static int is_our_ref(struct object *o)
 440 {
 441         return o->flags &
 442                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 443 }
 444
 445 static void check_non_tip(void)
 446 {
 447         static const char *argv[] = {
 448                 "rev-list", "--stdin", NULL,
 449         };
 450         static struct child_process cmd = CHILD_PROCESS_INIT;
 451         struct object *o;
 452         char namebuf[42]; /* ^ + SHA-1 + LF */
 453         int i;
 454
 455         /* In the normal in-process case non-tip request can never happen */
 456         if (!stateless_rpc)
 457                 goto error;
 458
 459         cmd.argv = argv;
 460         cmd.git_cmd = 1;
 461         cmd.no_stderr = 1;
 462         cmd.in = -1;
 463         cmd.out = -1;
 464
 465         if (start_command(&cmd))
 466                 goto error;
 467
 468         /*
 469          * If rev-list --stdin encounters an unknown commit, it
 470          * terminates, which will cause SIGPIPE in the write loop
 471          * below.
 472          */
 473         sigchain_push(SIGPIPE, SIG_IGN);
 474
 475         namebuf[0] = '^';
 476         namebuf[41] = '\n';
 477         for (i = get_max_object_index(); 0 < i; ) {
 478                 o = get_indexed_object(--i);
 479                 if (!o)
 480                         continue;
 481                 if (!is_our_ref(o))
 482                         continue;
 483                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 484                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 485                         goto error;
 486         }
 487         namebuf[40] = '\n';
 488         for (i = 0; i < want_obj.nr; i++) {
 489                 o = want_obj.objects[i].item;
 490                 if (is_our_ref(o))
 491                         continue;
 492                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 493                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 494                         goto error;
 495         }
 496         close(cmd.in);
 497
 498         sigchain_pop(SIGPIPE);
 499
 500         /*
 501          * The commits out of the rev-list are not ancestors of
 502          * our ref.
 503          */
 504         i = read_in_full(cmd.out, namebuf, 1);
 505         if (i)
 506                 goto error;
 507         close(cmd.out);
 508
 509         /*
 510          * rev-list may have died by encountering a bad commit
 511          * in the history, in which case we do want to bail out
 512          * even when it showed no commit.
 513          */
 514         if (finish_command(&cmd))
 515                 goto error;
 516
 517         /* All the non-tip ones are ancestors of what we advertised */
 518         return;
 519
 520 error:
 521         /* Pick one of them (we know there at least is one) */
 522         for (i = 0; i < want_obj.nr; i++) {
 523                 o = want_obj.objects[i].item;
 524                 if (!is_our_ref(o))
 525                         die("git upload-pack: not our ref %s",
 526                             sha1_to_hex(o->sha1));
 527         }
 528 }
 529
 530 static void receive_needs(void)
 531 {
 532         struct object_array shallows = OBJECT_ARRAY_INIT;
 533         int depth = 0;
 534         int has_non_tip = 0;
 535
 536         shallow_nr = 0;
 537         for (;;) {
 538                 struct object *o;
 539                 const char *features;
 540                 unsigned char sha1_buf[20];
 541                 char *line = packet_read_line(0, NULL);
 542                 reset_timeout();
 543                 if (!line)
 544                         break;
 545
 546                 if (starts_with(line, "shallow ")) {
 547                         unsigned char sha1[20];
 548                         struct object *object;
 549                         if (get_sha1_hex(line + 8, sha1))
 550                                 die("invalid shallow line: %s", line);
 551                         object = parse_object(sha1);
 552                         if (!object)
 553                                 continue;
 554                         if (object->type != OBJ_COMMIT)
 555                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 556                         if (!(object->flags & CLIENT_SHALLOW)) {
 557                                 object->flags |= CLIENT_SHALLOW;
 558                                 add_object_array(object, NULL, &shallows);
 559                         }
 560                         continue;
 561                 }
 562                 if (starts_with(line, "deepen ")) {
 563                         char *end;
 564                         depth = strtol(line + 7, &end, 0);
 565                         if (end == line + 7 || depth <= 0)
 566                                 die("Invalid deepen: %s", line);
 567                         continue;
 568                 }
 569                 if (!starts_with(line, "want ") ||
 570                     get_sha1_hex(line+5, sha1_buf))
 571                         die("git upload-pack: protocol error, "
 572                             "expected to get sha, not '%s'", line);
 573
 574                 features = line + 45;
 575
 576                 if (parse_feature_request(features, "multi_ack_detailed"))
 577                         multi_ack = 2;
 578                 else if (parse_feature_request(features, "multi_ack"))
 579                         multi_ack = 1;
 580                 if (parse_feature_request(features, "no-done"))
 581                         no_done = 1;
 582                 if (parse_feature_request(features, "thin-pack"))
 583                         use_thin_pack = 1;
 584                 if (parse_feature_request(features, "ofs-delta"))
 585                         use_ofs_delta = 1;
 586                 if (parse_feature_request(features, "side-band-64k"))
 587                         use_sideband = LARGE_PACKET_MAX;
 588                 else if (parse_feature_request(features, "side-band"))
 589                         use_sideband = DEFAULT_PACKET_MAX;
 590                 if (parse_feature_request(features, "no-progress"))
 591                         no_progress = 1;
 592                 if (parse_feature_request(features, "include-tag"))
 593                         use_include_tag = 1;
 594
 595                 o = parse_object(sha1_buf);
 596                 if (!o)
 597                         die("git upload-pack: not our ref %s",
 598                             sha1_to_hex(sha1_buf));
 599                 if (!(o->flags & WANTED)) {
 600                         o->flags |= WANTED;
 601                         if (!is_our_ref(o))
 602                                 has_non_tip = 1;
 603                         add_object_array(o, NULL, &want_obj);
 604                 }
 605         }
 606
 607         /*
 608          * We have sent all our refs already, and the other end
 609          * should have chosen out of them. When we are operating
 610          * in the stateless RPC mode, however, their choice may
 611          * have been based on the set of older refs advertised
 612          * by another process that handled the initial request.
 613          */
 614         if (has_non_tip)
 615                 check_non_tip();
 616
 617         if (!use_sideband && daemon_mode)
 618                 no_progress = 1;
 619
 620         if (depth == 0 && shallows.nr == 0)
 621                 return;
 622         if (depth > 0) {
 623                 struct commit_list *result = NULL, *backup = NULL;
 624                 int i;
 625                 if (depth == INFINITE_DEPTH && !is_repository_shallow())
 626                         for (i = 0; i < shallows.nr; i++) {
 627                                 struct object *object = shallows.objects[i].item;
 628                                 object->flags |= NOT_SHALLOW;
 629                         }
 630                 else
 631                         backup = result =
 632                                 get_shallow_commits(&want_obj, depth,
 633                                                     SHALLOW, NOT_SHALLOW);
 634                 while (result) {
 635                         struct object *object = &result->item->object;
 636                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 637                                 packet_write(1, "shallow %s",
 638                                                 sha1_to_hex(object->sha1));
 639                                 register_shallow(object->sha1);
 640                                 shallow_nr++;
 641                         }
 642                         result = result->next;
 643                 }
 644                 free_commit_list(backup);
 645                 for (i = 0; i < shallows.nr; i++) {
 646                         struct object *object = shallows.objects[i].item;
 647                         if (object->flags & NOT_SHALLOW) {
 648                                 struct commit_list *parents;
 649                                 packet_write(1, "unshallow %s",
 650                                         sha1_to_hex(object->sha1));
 651                                 object->flags &= ~CLIENT_SHALLOW;
 652                                 /* make sure the real parents are parsed */
 653                                 unregister_shallow(object->sha1);
 654                                 object->parsed = 0;
 655                                 parse_commit_or_die((struct commit *)object);
 656                                 parents = ((struct commit *)object)->parents;
 657                                 while (parents) {
 658                                         add_object_array(&parents->item->object,
 659                                                         NULL, &want_obj);
 660                                         parents = parents->next;
 661                                 }
 662                                 add_object_array(object, NULL, &extra_edge_obj);
 663                         }
 664                         /* make sure commit traversal conforms to client */
 665                         register_shallow(object->sha1);
 666                 }
 667                 packet_flush(1);
 668         } else
 669                 if (shallows.nr > 0) {
 670                         int i;
 671                         for (i = 0; i < shallows.nr; i++)
 672                                 register_shallow(shallows.objects[i].item->sha1);
 673                 }
 674
 675         shallow_nr += shallows.nr;
 676         free(shallows.objects);
 677 }
 678
 679 /* return non-zero if the ref is hidden, otherwise 0 */
 680 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 681 {
 682         struct object *o = lookup_unknown_object(sha1);
 683
 684         if (ref_is_hidden(refname)) {
 685                 o->flags |= HIDDEN_REF;
 686                 return 1;
 687         }
 688         if (!o)
 689                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 690         o->flags |= OUR_REF;
 691         return 0;
 692 }
 693
 694 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 695 {
 696         struct string_list_item *item;
 697
 698         if (!symref->nr)
 699                 return;
 700         for_each_string_list_item(item, symref)
 701                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 702 }
 703
 704 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 705 {
 706         static const char *capabilities = "multi_ack thin-pack side-band"
 707                 " side-band-64k ofs-delta shallow no-progress"
 708                 " include-tag multi_ack_detailed";
 709         const char *refname_nons = strip_namespace(refname);
 710         unsigned char peeled[20];
 711
 712         if (mark_our_ref(refname, sha1, flag, NULL))
 713                 return 0;
 714
 715         if (capabilities) {
 716                 struct strbuf symref_info = STRBUF_INIT;
 717
 718                 format_symref_info(&symref_info, cb_data);
 719                 packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
 720                              sha1_to_hex(sha1), refname_nons,
 721                              0, capabilities,
 722                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 723                              stateless_rpc ? " no-done" : "",
 724                              symref_info.buf,
 725                              git_user_agent_sanitized());
 726                 strbuf_release(&symref_info);
 727         } else {
 728                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 729         }
 730         capabilities = NULL;
 731         if (!peel_ref(refname, peeled))
 732                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 733         return 0;
 734 }
 735
 736 static int find_symref(const char *refname, const unsigned char *sha1, int flag,
 737                        void *cb_data)
 738 {
 739         const char *symref_target;
 740         struct string_list_item *item;
 741         unsigned char unused[20];
 742
 743         if ((flag & REF_ISSYMREF) == 0)
 744                 return 0;
 745         symref_target = resolve_ref_unsafe(refname, unused, 0, &flag);
 746         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 747                 die("'%s' is a symref but it is not?", refname);
 748         item = string_list_append(cb_data, refname);
 749         item->util = xstrdup(symref_target);
 750         return 0;
 751 }
 752
 753 static void upload_pack(void)
 754 {
 755         struct string_list symref = STRING_LIST_INIT_DUP;
 756
 757         head_ref_namespaced(find_symref, &symref);
 758
 759         if (advertise_refs || !stateless_rpc) {
 760                 reset_timeout();
 761                 head_ref_namespaced(send_ref, &symref);
 762                 for_each_namespaced_ref(send_ref, &symref);
 763                 advertise_shallow_grafts(1);
 764                 packet_flush(1);
 765         } else {
 766                 head_ref_namespaced(mark_our_ref, NULL);
 767                 for_each_namespaced_ref(mark_our_ref, NULL);
 768         }
 769         string_list_clear(&symref, 1);
 770         if (advertise_refs)
 771                 return;
 772
 773         receive_needs();
 774         if (want_obj.nr) {
 775                 get_common_commits();
 776                 create_pack_file();
 777         }
 778 }
 779
 780 static int upload_pack_config(const char *var, const char *value, void *unused)
 781 {
 782         if (!strcmp("uploadpack.allowtipsha1inwant", var))
 783                 allow_tip_sha1_in_want = git_config_bool(var, value);
 784         else if (!strcmp("uploadpack.keepalive", var)) {
 785                 keepalive = git_config_int(var, value);
 786                 if (!keepalive)
 787                         keepalive = -1;
 788         }
 789         return parse_hide_refs_config(var, value, "uploadpack");
 790 }
 791
 792 int main(int argc, char **argv)
 793 {
 794         char *dir;
 795         int i;
 796         int strict = 0;
 797
 798         git_setup_gettext();
 799
 800         packet_trace_identity("upload-pack");
 801         git_extract_argv0_path(argv[0]);
 802         check_replace_refs = 0;
 803
 804         for (i = 1; i < argc; i++) {
 805                 char *arg = argv[i];
 806
 807                 if (arg[0] != '-')
 808                         break;
 809                 if (!strcmp(arg, "--advertise-refs")) {
 810                         advertise_refs = 1;
 811                         continue;
 812                 }
 813                 if (!strcmp(arg, "--stateless-rpc")) {
 814                         stateless_rpc = 1;
 815                         continue;
 816                 }
 817                 if (!strcmp(arg, "--strict")) {
 818                         strict = 1;
 819                         continue;
 820                 }
 821                 if (starts_with(arg, "--timeout=")) {
 822                         timeout = atoi(arg+10);
 823                         daemon_mode = 1;
 824                         continue;
 825                 }
 826                 if (!strcmp(arg, "--")) {
 827                         i++;
 828                         break;
 829                 }
 830         }
 831
 832         if (i != argc-1)
 833                 usage(upload_pack_usage);
 834
 835         setup_path();
 836
 837         dir = argv[i];
 838
 839         if (!enter_repo(dir, strict))
 840                 die("'%s' does not appear to be a git repository", dir);
 841
 842         git_config(upload_pack_config, NULL);
 843         upload_pack();
 844         return 0;
 845 }