git.oblomov.eu Git - git/blob - upload-pack.c

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