upload-pack.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "pkt-line.h"
   4 #include "sideband.h"
   5 #include "tag.h"
   6 #include "object.h"
   7 #include "commit.h"
   8 #include "exec_cmd.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "list-objects.h"
  12 #include "run-command.h"
  13 #include "connect.h"
  14 #include "sigchain.h"
  15 #include "version.h"
  16 #include "string-list.h"
  17
  18 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  19
  20 /* Remember to update object flag allocation in object.h */
  21 #define THEY_HAVE       (1u << 11)
  22 #define OUR_REF         (1u << 12)
  23 #define WANTED          (1u << 13)
  24 #define COMMON_KNOWN    (1u << 14)
  25 #define REACHABLE       (1u << 15)
  26
  27 #define SHALLOW         (1u << 16)
  28 #define NOT_SHALLOW     (1u << 17)
  29 #define CLIENT_SHALLOW  (1u << 18)
  30 #define HIDDEN_REF      (1u << 19)
  31
  32 static unsigned long oldest_have;
  33
  34 static int multi_ack;
  35 static int no_done;
  36 static int use_thin_pack, use_ofs_delta, use_include_tag;
  37 static int no_progress, daemon_mode;
  38 static int allow_tip_sha1_in_want;
  39 static int shallow_nr;
  40 static struct object_array have_obj;
  41 static struct object_array want_obj;
  42 static struct object_array extra_edge_obj;
  43 static unsigned int timeout;
  44 static int keepalive = 5;
  45 /* 0 for no sideband,
  46  * otherwise maximum packet size (up to 65520 bytes).
  47  */
  48 static int use_sideband;
  49 static int advertise_refs;
  50 static int stateless_rpc;
  51
  52 static void reset_timeout(void)
  53 {
  54         alarm(timeout);
  55 }
  56
  57 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  58 {
  59         if (use_sideband)
  60                 return send_sideband(1, fd, data, sz, use_sideband);
  61         if (fd == 3)
  62                 /* emergency quit */
  63                 fd = 2;
  64         if (fd == 2) {
  65                 /* XXX: are we happy to lose stuff here? */
  66                 xwrite(fd, data, sz);
  67                 return sz;
  68         }
  69         write_or_die(fd, data, sz);
  70         return sz;
  71 }
  72
  73 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  74 {
  75         FILE *fp = cb_data;
  76         if (graft->nr_parent == -1)
  77                 fprintf(fp, "--shallow %s\n", sha1_to_hex(graft->sha1));
  78         return 0;
  79 }
  80
  81 static void create_pack_file(void)
  82 {
  83         struct child_process pack_objects = CHILD_PROCESS_INIT;
  84         char data[8193], progress[128];
  85         char abort_msg[] = "aborting due to possible repository "
  86                 "corruption on the remote side.";
  87         int buffered = -1;
  88         ssize_t sz;
  89         const char *argv[12];
  90         int i, arg = 0;
  91         FILE *pipe_fd;
  92
  93         if (shallow_nr) {
  94                 argv[arg++] = "--shallow-file";
  95                 argv[arg++] = "";
  96         }
  97         argv[arg++] = "pack-objects";
  98         argv[arg++] = "--revs";
  99         if (use_thin_pack)
 100                 argv[arg++] = "--thin";
 101
 102         argv[arg++] = "--stdout";
 103         if (!no_progress)
 104                 argv[arg++] = "--progress";
 105         if (use_ofs_delta)
 106                 argv[arg++] = "--delta-base-offset";
 107         if (use_include_tag)
 108                 argv[arg++] = "--include-tag";
 109         argv[arg++] = NULL;
 110
 111         pack_objects.in = -1;
 112         pack_objects.out = -1;
 113         pack_objects.err = -1;
 114         pack_objects.git_cmd = 1;
 115         pack_objects.argv = argv;
 116
 117         if (start_command(&pack_objects))
 118                 die("git upload-pack: unable to fork git-pack-objects");
 119
 120         pipe_fd = xfdopen(pack_objects.in, "w");
 121
 122         if (shallow_nr)
 123                 for_each_commit_graft(write_one_shallow, pipe_fd);
 124
 125         for (i = 0; i < want_obj.nr; i++)
 126                 fprintf(pipe_fd, "%s\n",
 127                         sha1_to_hex(want_obj.objects[i].item->sha1));
 128         fprintf(pipe_fd, "--not\n");
 129         for (i = 0; i < have_obj.nr; i++)
 130                 fprintf(pipe_fd, "%s\n",
 131                         sha1_to_hex(have_obj.objects[i].item->sha1));
 132         for (i = 0; i < extra_edge_obj.nr; i++)
 133                 fprintf(pipe_fd, "%s\n",
 134                         sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
 135         fprintf(pipe_fd, "\n");
 136         fflush(pipe_fd);
 137         fclose(pipe_fd);
 138
 139         /* We read from pack_objects.err to capture stderr output for
 140          * progress bar, and pack_objects.out to capture the pack data.
 141          */
 142
 143         while (1) {
 144                 struct pollfd pfd[2];
 145                 int pe, pu, pollsize;
 146                 int ret;
 147
 148                 reset_timeout();
 149
 150                 pollsize = 0;
 151                 pe = pu = -1;
 152
 153                 if (0 <= pack_objects.out) {
 154                         pfd[pollsize].fd = pack_objects.out;
 155                         pfd[pollsize].events = POLLIN;
 156                         pu = pollsize;
 157                         pollsize++;
 158                 }
 159                 if (0 <= pack_objects.err) {
 160                         pfd[pollsize].fd = pack_objects.err;
 161                         pfd[pollsize].events = POLLIN;
 162                         pe = pollsize;
 163                         pollsize++;
 164                 }
 165
 166                 if (!pollsize)
 167                         break;
 168
 169                 ret = poll(pfd, pollsize,
 170                         keepalive < 0 ? -1 : 1000 * keepalive);
 171
 172                 if (ret < 0) {
 173                         if (errno != EINTR) {
 174                                 error("poll failed, resuming: %s",
 175                                       strerror(errno));
 176                                 sleep(1);
 177                         }
 178                         continue;
 179                 }
 180                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 181                         /* Status ready; we ship that in the side-band
 182                          * or dump to the standard error.
 183                          */
 184                         sz = xread(pack_objects.err, progress,
 185                                   sizeof(progress));
 186                         if (0 < sz)
 187                                 send_client_data(2, progress, sz);
 188                         else if (sz == 0) {
 189                                 close(pack_objects.err);
 190                                 pack_objects.err = -1;
 191                         }
 192                         else
 193                                 goto fail;
 194                         /* give priority to status messages */
 195                         continue;
 196                 }
 197                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 198                         /* Data ready; we keep the last byte to ourselves
 199                          * in case we detect broken rev-list, so that we
 200                          * can leave the stream corrupted.  This is
 201                          * unfortunate -- unpack-objects would happily
 202                          * accept a valid packdata with trailing garbage,
 203                          * so appending garbage after we pass all the
 204                          * pack data is not good enough to signal
 205                          * breakage to downstream.
 206                          */
 207                         char *cp = data;
 208                         ssize_t outsz = 0;
 209                         if (0 <= buffered) {
 210                                 *cp++ = buffered;
 211                                 outsz++;
 212                         }
 213                         sz = xread(pack_objects.out, cp,
 214                                   sizeof(data) - outsz);
 215                         if (0 < sz)
 216                                 ;
 217                         else if (sz == 0) {
 218                                 close(pack_objects.out);
 219                                 pack_objects.out = -1;
 220                         }
 221                         else
 222                                 goto fail;
 223                         sz += outsz;
 224                         if (1 < sz) {
 225                                 buffered = data[sz-1] & 0xFF;
 226                                 sz--;
 227                         }
 228                         else
 229                                 buffered = -1;
 230                         sz = send_client_data(1, data, sz);
 231                         if (sz < 0)
 232                                 goto fail;
 233                 }
 234
 235                 /*
 236                  * We hit the keepalive timeout without saying anything; send
 237                  * an empty message on the data sideband just to let the other
 238                  * side know we're still working on it, but don't have any data
 239                  * yet.
 240                  *
 241                  * If we don't have a sideband channel, there's no room in the
 242                  * protocol to say anything, so those clients are just out of
 243                  * luck.
 244                  */
 245                 if (!ret && use_sideband) {
 246                         static const char buf[] = "0005\1";
 247                         write_or_die(1, buf, 5);
 248                 }
 249         }
 250
 251         if (finish_command(&pack_objects)) {
 252                 error("git upload-pack: git-pack-objects died with error.");
 253                 goto fail;
 254         }
 255
 256         /* flush the data */
 257         if (0 <= buffered) {
 258                 data[0] = buffered;
 259                 sz = send_client_data(1, data, 1);
 260                 if (sz < 0)
 261                         goto fail;
 262                 fprintf(stderr, "flushed.\n");
 263         }
 264         if (use_sideband)
 265                 packet_flush(1);
 266         return;
 267
 268  fail:
 269         send_client_data(3, abort_msg, sizeof(abort_msg));
 270         die("git upload-pack: %s", abort_msg);
 271 }
 272
 273 static int got_sha1(char *hex, unsigned char *sha1)
 274 {
 275         struct object *o;
 276         int we_knew_they_have = 0;
 277
 278         if (get_sha1_hex(hex, sha1))
 279                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 280         if (!has_sha1_file(sha1))
 281                 return -1;
 282
 283         o = parse_object(sha1);
 284         if (!o)
 285                 die("oops (%s)", sha1_to_hex(sha1));
 286         if (o->type == OBJ_COMMIT) {
 287                 struct commit_list *parents;
 288                 struct commit *commit = (struct commit *)o;
 289                 if (o->flags & THEY_HAVE)
 290                         we_knew_they_have = 1;
 291                 else
 292                         o->flags |= THEY_HAVE;
 293                 if (!oldest_have || (commit->date < oldest_have))
 294                         oldest_have = commit->date;
 295                 for (parents = commit->parents;
 296                      parents;
 297                      parents = parents->next)
 298                         parents->item->object.flags |= THEY_HAVE;
 299         }
 300         if (!we_knew_they_have) {
 301                 add_object_array(o, NULL, &have_obj);
 302                 return 1;
 303         }
 304         return 0;
 305 }
 306
 307 static int reachable(struct commit *want)
 308 {
 309         struct commit_list *work = NULL;
 310
 311         commit_list_insert_by_date(want, &work);
 312         while (work) {
 313                 struct commit_list *list = work->next;
 314                 struct commit *commit = work->item;
 315                 free(work);
 316                 work = list;
 317
 318                 if (commit->object.flags & THEY_HAVE) {
 319                         want->object.flags |= COMMON_KNOWN;
 320                         break;
 321                 }
 322                 if (!commit->object.parsed)
 323                         parse_object(commit->object.sha1);
 324                 if (commit->object.flags & REACHABLE)
 325                         continue;
 326                 commit->object.flags |= REACHABLE;
 327                 if (commit->date < oldest_have)
 328                         continue;
 329                 for (list = commit->parents; list; list = list->next) {
 330                         struct commit *parent = list->item;
 331                         if (!(parent->object.flags & REACHABLE))
 332                                 commit_list_insert_by_date(parent, &work);
 333                 }
 334         }
 335         want->object.flags |= REACHABLE;
 336         clear_commit_marks(want, REACHABLE);
 337         free_commit_list(work);
 338         return (want->object.flags & COMMON_KNOWN);
 339 }
 340
 341 static int ok_to_give_up(void)
 342 {
 343         int i;
 344
 345         if (!have_obj.nr)
 346                 return 0;
 347
 348         for (i = 0; i < want_obj.nr; i++) {
 349                 struct object *want = want_obj.objects[i].item;
 350
 351                 if (want->flags & COMMON_KNOWN)
 352                         continue;
 353                 want = deref_tag(want, "a want line", 0);
 354                 if (!want || want->type != OBJ_COMMIT) {
 355                         /* no way to tell if this is reachable by
 356                          * looking at the ancestry chain alone, so
 357                          * leave a note to ourselves not to worry about
 358                          * this object anymore.
 359                          */
 360                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 361                         continue;
 362                 }
 363                 if (!reachable((struct commit *)want))
 364                         return 0;
 365         }
 366         return 1;
 367 }
 368
 369 static int get_common_commits(void)
 370 {
 371         unsigned char sha1[20];
 372         char last_hex[41];
 373         int got_common = 0;
 374         int got_other = 0;
 375         int sent_ready = 0;
 376
 377         save_commit_buffer = 0;
 378
 379         for (;;) {
 380                 char *line = packet_read_line(0, NULL);
 381                 reset_timeout();
 382
 383                 if (!line) {
 384                         if (multi_ack == 2 && got_common
 385                             && !got_other && ok_to_give_up()) {
 386                                 sent_ready = 1;
 387                                 packet_write(1, "ACK %s ready\n", last_hex);
 388                         }
 389                         if (have_obj.nr == 0 || multi_ack)
 390                                 packet_write(1, "NAK\n");
 391
 392                         if (no_done && sent_ready) {
 393                                 packet_write(1, "ACK %s\n", last_hex);
 394                                 return 0;
 395                         }
 396                         if (stateless_rpc)
 397                                 exit(0);
 398                         got_common = 0;
 399                         got_other = 0;
 400                         continue;
 401                 }
 402                 if (starts_with(line, "have ")) {
 403                         switch (got_sha1(line+5, sha1)) {
 404                         case -1: /* they have what we do not */
 405                                 got_other = 1;
 406                                 if (multi_ack && ok_to_give_up()) {
 407                                         const char *hex = sha1_to_hex(sha1);
 408                                         if (multi_ack == 2) {
 409                                                 sent_ready = 1;
 410                                                 packet_write(1, "ACK %s ready\n", hex);
 411                                         } else
 412                                                 packet_write(1, "ACK %s continue\n", hex);
 413                                 }
 414                                 break;
 415                         default:
 416                                 got_common = 1;
 417                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 418                                 if (multi_ack == 2)
 419                                         packet_write(1, "ACK %s common\n", last_hex);
 420                                 else if (multi_ack)
 421                                         packet_write(1, "ACK %s continue\n", last_hex);
 422                                 else if (have_obj.nr == 1)
 423                                         packet_write(1, "ACK %s\n", last_hex);
 424                                 break;
 425                         }
 426                         continue;
 427                 }
 428                 if (!strcmp(line, "done")) {
 429                         if (have_obj.nr > 0) {
 430                                 if (multi_ack)
 431                                         packet_write(1, "ACK %s\n", last_hex);
 432                                 return 0;
 433                         }
 434                         packet_write(1, "NAK\n");
 435                         return -1;
 436                 }
 437                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 438         }
 439 }
 440
 441 static int is_our_ref(struct object *o)
 442 {
 443         return o->flags &
 444                 ((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
 445 }
 446
 447 static void check_non_tip(void)
 448 {
 449         static const char *argv[] = {
 450                 "rev-list", "--stdin", NULL,
 451         };
 452         static struct child_process cmd = CHILD_PROCESS_INIT;
 453         struct object *o;
 454         char namebuf[42]; /* ^ + SHA-1 + LF */
 455         int i;
 456
 457         /* In the normal in-process case non-tip request can never happen */
 458         if (!stateless_rpc)
 459                 goto error;
 460
 461         cmd.argv = argv;
 462         cmd.git_cmd = 1;
 463         cmd.no_stderr = 1;
 464         cmd.in = -1;
 465         cmd.out = -1;
 466
 467         if (start_command(&cmd))
 468                 goto error;
 469
 470         /*
 471          * If rev-list --stdin encounters an unknown commit, it
 472          * terminates, which will cause SIGPIPE in the write loop
 473          * below.
 474          */
 475         sigchain_push(SIGPIPE, SIG_IGN);
 476
 477         namebuf[0] = '^';
 478         namebuf[41] = '\n';
 479         for (i = get_max_object_index(); 0 < i; ) {
 480                 o = get_indexed_object(--i);
 481                 if (!o)
 482                         continue;
 483                 if (!is_our_ref(o))
 484                         continue;
 485                 memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
 486                 if (write_in_full(cmd.in, namebuf, 42) < 0)
 487                         goto error;
 488         }
 489         namebuf[40] = '\n';
 490         for (i = 0; i < want_obj.nr; i++) {
 491                 o = want_obj.objects[i].item;
 492                 if (is_our_ref(o))
 493                         continue;
 494                 memcpy(namebuf, sha1_to_hex(o->sha1), 40);
 495                 if (write_in_full(cmd.in, namebuf, 41) < 0)
 496                         goto error;
 497         }
 498         close(cmd.in);
 499
 500         sigchain_pop(SIGPIPE);
 501
 502         /*
 503          * The commits out of the rev-list are not ancestors of
 504          * our ref.
 505          */
 506         i = read_in_full(cmd.out, namebuf, 1);
 507         if (i)
 508                 goto error;
 509         close(cmd.out);
 510
 511         /*
 512          * rev-list may have died by encountering a bad commit
 513          * in the history, in which case we do want to bail out
 514          * even when it showed no commit.
 515          */
 516         if (finish_command(&cmd))
 517                 goto error;
 518
 519         /* All the non-tip ones are ancestors of what we advertised */
 520         return;
 521
 522 error:
 523         /* Pick one of them (we know there at least is one) */
 524         for (i = 0; i < want_obj.nr; i++) {
 525                 o = want_obj.objects[i].item;
 526                 if (!is_our_ref(o))
 527                         die("git upload-pack: not our ref %s",
 528                             sha1_to_hex(o->sha1));
 529         }
 530 }
 531
 532 static void receive_needs(void)
 533 {
 534         struct object_array shallows = OBJECT_ARRAY_INIT;
 535         int depth = 0;
 536         int has_non_tip = 0;
 537
 538         shallow_nr = 0;
 539         for (;;) {
 540                 struct object *o;
 541                 const char *features;
 542                 unsigned char sha1_buf[20];
 543                 char *line = packet_read_line(0, NULL);
 544                 reset_timeout();
 545                 if (!line)
 546                         break;
 547
 548                 if (starts_with(line, "shallow ")) {
 549                         unsigned char sha1[20];
 550                         struct object *object;
 551                         if (get_sha1_hex(line + 8, sha1))
 552                                 die("invalid shallow line: %s", line);
 553                         object = parse_object(sha1);
 554                         if (!object)
 555                                 continue;
 556                         if (object->type != OBJ_COMMIT)
 557                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 558                         if (!(object->flags & CLIENT_SHALLOW)) {
 559                                 object->flags |= CLIENT_SHALLOW;
 560                                 add_object_array(object, NULL, &shallows);
 561                         }
 562                         continue;
 563                 }
 564                 if (starts_with(line, "deepen ")) {
 565                         char *end;
 566                         depth = strtol(line + 7, &end, 0);
 567                         if (end == line + 7 || depth <= 0)
 568                                 die("Invalid deepen: %s", line);
 569                         continue;
 570                 }
 571                 if (!starts_with(line, "want ") ||
 572                     get_sha1_hex(line+5, sha1_buf))
 573                         die("git upload-pack: protocol error, "
 574                             "expected to get sha, not '%s'", line);
 575
 576                 features = line + 45;
 577
 578                 if (parse_feature_request(features, "multi_ack_detailed"))
 579                         multi_ack = 2;
 580                 else if (parse_feature_request(features, "multi_ack"))
 581                         multi_ack = 1;
 582                 if (parse_feature_request(features, "no-done"))
 583                         no_done = 1;
 584                 if (parse_feature_request(features, "thin-pack"))
 585                         use_thin_pack = 1;
 586                 if (parse_feature_request(features, "ofs-delta"))
 587                         use_ofs_delta = 1;
 588                 if (parse_feature_request(features, "side-band-64k"))
 589                         use_sideband = LARGE_PACKET_MAX;
 590                 else if (parse_feature_request(features, "side-band"))
 591                         use_sideband = DEFAULT_PACKET_MAX;
 592                 if (parse_feature_request(features, "no-progress"))
 593                         no_progress = 1;
 594                 if (parse_feature_request(features, "include-tag"))
 595                         use_include_tag = 1;
 596
 597                 o = parse_object(sha1_buf);
 598                 if (!o)
 599                         die("git upload-pack: not our ref %s",
 600                             sha1_to_hex(sha1_buf));
 601                 if (!(o->flags & WANTED)) {
 602                         o->flags |= WANTED;
 603                         if (!is_our_ref(o))
 604                                 has_non_tip = 1;
 605                         add_object_array(o, NULL, &want_obj);
 606                 }
 607         }
 608
 609         /*
 610          * We have sent all our refs already, and the other end
 611          * should have chosen out of them. When we are operating
 612          * in the stateless RPC mode, however, their choice may
 613          * have been based on the set of older refs advertised
 614          * by another process that handled the initial request.
 615          */
 616         if (has_non_tip)
 617                 check_non_tip();
 618
 619         if (!use_sideband && daemon_mode)
 620                 no_progress = 1;
 621
 622         if (depth == 0 && shallows.nr == 0)
 623                 return;
 624         if (depth > 0) {
 625                 struct commit_list *result = NULL, *backup = NULL;
 626                 int i;
 627                 if (depth == INFINITE_DEPTH && !is_repository_shallow())
 628                         for (i = 0; i < shallows.nr; i++) {
 629                                 struct object *object = shallows.objects[i].item;
 630                                 object->flags |= NOT_SHALLOW;
 631                         }
 632                 else
 633                         backup = result =
 634                                 get_shallow_commits(&want_obj, depth,
 635                                                     SHALLOW, NOT_SHALLOW);
 636                 while (result) {
 637                         struct object *object = &result->item->object;
 638                         if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 639                                 packet_write(1, "shallow %s",
 640                                                 sha1_to_hex(object->sha1));
 641                                 register_shallow(object->sha1);
 642                                 shallow_nr++;
 643                         }
 644                         result = result->next;
 645                 }
 646                 free_commit_list(backup);
 647                 for (i = 0; i < shallows.nr; i++) {
 648                         struct object *object = shallows.objects[i].item;
 649                         if (object->flags & NOT_SHALLOW) {
 650                                 struct commit_list *parents;
 651                                 packet_write(1, "unshallow %s",
 652                                         sha1_to_hex(object->sha1));
 653                                 object->flags &= ~CLIENT_SHALLOW;
 654                                 /* make sure the real parents are parsed */
 655                                 unregister_shallow(object->sha1);
 656                                 object->parsed = 0;
 657                                 parse_commit_or_die((struct commit *)object);
 658                                 parents = ((struct commit *)object)->parents;
 659                                 while (parents) {
 660                                         add_object_array(&parents->item->object,
 661                                                         NULL, &want_obj);
 662                                         parents = parents->next;
 663                                 }
 664                                 add_object_array(object, NULL, &extra_edge_obj);
 665                         }
 666                         /* make sure commit traversal conforms to client */
 667                         register_shallow(object->sha1);
 668                 }
 669                 packet_flush(1);
 670         } else
 671                 if (shallows.nr > 0) {
 672                         int i;
 673                         for (i = 0; i < shallows.nr; i++)
 674                                 register_shallow(shallows.objects[i].item->sha1);
 675                 }
 676
 677         shallow_nr += shallows.nr;
 678         free(shallows.objects);
 679 }
 680
 681 /* return non-zero if the ref is hidden, otherwise 0 */
 682 static int mark_our_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 683 {
 684         struct object *o = lookup_unknown_object(sha1);
 685
 686         if (ref_is_hidden(refname)) {
 687                 o->flags |= HIDDEN_REF;
 688                 return 1;
 689         }
 690         if (!o)
 691                 die("git upload-pack: cannot find object %s:", sha1_to_hex(sha1));
 692         o->flags |= OUR_REF;
 693         return 0;
 694 }
 695
 696 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 697 {
 698         struct string_list_item *item;
 699
 700         if (!symref->nr)
 701                 return;
 702         for_each_string_list_item(item, symref)
 703                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 704 }
 705
 706 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 707 {
 708         static const char *capabilities = "multi_ack thin-pack side-band"
 709                 " side-band-64k ofs-delta shallow no-progress"
 710                 " include-tag multi_ack_detailed";
 711         const char *refname_nons = strip_namespace(refname);
 712         unsigned char peeled[20];
 713
 714         if (mark_our_ref(refname, sha1, flag, NULL))
 715                 return 0;
 716
 717         if (capabilities) {
 718                 struct strbuf symref_info = STRBUF_INIT;
 719
 720                 format_symref_info(&symref_info, cb_data);
 721                 packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
 722                              sha1_to_hex(sha1), refname_nons,
 723                              0, capabilities,
 724                              allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
 725                              stateless_rpc ? " no-done" : "",
 726                              symref_info.buf,
 727                              git_user_agent_sanitized());
 728                 strbuf_release(&symref_info);
 729         } else {
 730                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
 731         }
 732         capabilities = NULL;
 733         if (!peel_ref(refname, peeled))
 734                 packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
 735         return 0;
 736 }
 737
 738 static int find_symref(const char *refname, const unsigned char *sha1, int flag,
 739                        void *cb_data)
 740 {
 741         const char *symref_target;
 742         struct string_list_item *item;
 743         unsigned char unused[20];
 744
 745         if ((flag & REF_ISSYMREF) == 0)
 746                 return 0;
 747         symref_target = resolve_ref_unsafe(refname, 0, unused, &flag);
 748         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 749                 die("'%s' is a symref but it is not?", refname);
 750         item = string_list_append(cb_data, refname);
 751         item->util = xstrdup(symref_target);
 752         return 0;
 753 }
 754
 755 static void upload_pack(void)
 756 {
 757         struct string_list symref = STRING_LIST_INIT_DUP;
 758
 759         head_ref_namespaced(find_symref, &symref);
 760
 761         if (advertise_refs || !stateless_rpc) {
 762                 reset_timeout();
 763                 head_ref_namespaced(send_ref, &symref);
 764                 for_each_namespaced_ref(send_ref, &symref);
 765                 advertise_shallow_grafts(1);
 766                 packet_flush(1);
 767         } else {
 768                 head_ref_namespaced(mark_our_ref, NULL);
 769                 for_each_namespaced_ref(mark_our_ref, NULL);
 770         }
 771         string_list_clear(&symref, 1);
 772         if (advertise_refs)
 773                 return;
 774
 775         receive_needs();
 776         if (want_obj.nr) {
 777                 get_common_commits();
 778                 create_pack_file();
 779         }
 780 }
 781
 782 static int upload_pack_config(const char *var, const char *value, void *unused)
 783 {
 784         if (!strcmp("uploadpack.allowtipsha1inwant", var))
 785                 allow_tip_sha1_in_want = git_config_bool(var, value);
 786         else if (!strcmp("uploadpack.keepalive", var)) {
 787                 keepalive = git_config_int(var, value);
 788                 if (!keepalive)
 789                         keepalive = -1;
 790         }
 791         return parse_hide_refs_config(var, value, "uploadpack");
 792 }
 793
 794 int main(int argc, char **argv)
 795 {
 796         char *dir;
 797         int i;
 798         int strict = 0;
 799
 800         git_setup_gettext();
 801
 802         packet_trace_identity("upload-pack");
 803         git_extract_argv0_path(argv[0]);
 804         check_replace_refs = 0;
 805
 806         for (i = 1; i < argc; i++) {
 807                 char *arg = argv[i];
 808
 809                 if (arg[0] != '-')
 810                         break;
 811                 if (!strcmp(arg, "--advertise-refs")) {
 812                         advertise_refs = 1;
 813                         continue;
 814                 }
 815                 if (!strcmp(arg, "--stateless-rpc")) {
 816                         stateless_rpc = 1;
 817                         continue;
 818                 }
 819                 if (!strcmp(arg, "--strict")) {
 820                         strict = 1;
 821                         continue;
 822                 }
 823                 if (starts_with(arg, "--timeout=")) {
 824                         timeout = atoi(arg+10);
 825                         daemon_mode = 1;
 826                         continue;
 827                 }
 828                 if (!strcmp(arg, "--")) {
 829                         i++;
 830                         break;
 831                 }
 832         }
 833
 834         if (i != argc-1)
 835                 usage(upload_pack_usage);
 836
 837         setup_path();
 838
 839         dir = argv[i];
 840
 841         if (!enter_repo(dir, strict))
 842                 die("'%s' does not appear to be a git repository", dir);
 843
 844         git_config(upload_pack_config, NULL);
 845         upload_pack();
 846         return 0;
 847 }