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