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