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 "connect.h"
  14 #include "sigchain.h"
  15 #include "version.h"
  16 #include "string-list.h"
  17 #include "argv-array.h"
  18
  19 static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
  20
  21 /* Remember to update object flag allocation in object.h */
  22 #define THEY_HAVE       (1u << 11)
  23 #define OUR_REF         (1u << 12)
  24 #define WANTED          (1u << 13)
  25 #define COMMON_KNOWN    (1u << 14)
  26 #define REACHABLE       (1u << 15)
  27
  28 #define SHALLOW         (1u << 16)
  29 #define NOT_SHALLOW     (1u << 17)
  30 #define CLIENT_SHALLOW  (1u << 18)
  31 #define HIDDEN_REF      (1u << 19)
  32
  33 static unsigned long oldest_have;
  34
  35 static int deepen_relative;
  36 static int multi_ack;
  37 static int no_done;
  38 static int use_thin_pack, use_ofs_delta, use_include_tag;
  39 static int no_progress, daemon_mode;
  40 /* Allow specifying sha1 if it is a ref tip. */
  41 #define ALLOW_TIP_SHA1  01
  42 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  43 #define ALLOW_REACHABLE_SHA1    02
  44 static unsigned int allow_unadvertised_object_request;
  45 static int shallow_nr;
  46 static struct object_array have_obj;
  47 static struct object_array want_obj;
  48 static struct object_array extra_edge_obj;
  49 static unsigned int timeout;
  50 static int keepalive = 5;
  51 /* 0 for no sideband,
  52  * otherwise maximum packet size (up to 65520 bytes).
  53  */
  54 static int use_sideband;
  55 static int advertise_refs;
  56 static int stateless_rpc;
  57
  58 static void reset_timeout(void)
  59 {
  60         alarm(timeout);
  61 }
  62
  63 static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
  64 {
  65         if (use_sideband)
  66                 return send_sideband(1, fd, data, sz, use_sideband);
  67         if (fd == 3)
  68                 /* emergency quit */
  69                 fd = 2;
  70         if (fd == 2) {
  71                 /* XXX: are we happy to lose stuff here? */
  72                 xwrite(fd, data, sz);
  73                 return sz;
  74         }
  75         write_or_die(fd, data, sz);
  76         return sz;
  77 }
  78
  79 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  80 {
  81         FILE *fp = cb_data;
  82         if (graft->nr_parent == -1)
  83                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  84         return 0;
  85 }
  86
  87 static void create_pack_file(void)
  88 {
  89         struct child_process pack_objects = CHILD_PROCESS_INIT;
  90         char data[8193], progress[128];
  91         char abort_msg[] = "aborting due to possible repository "
  92                 "corruption on the remote side.";
  93         int buffered = -1;
  94         ssize_t sz;
  95         const char *argv[13];
  96         int i, arg = 0;
  97         FILE *pipe_fd;
  98
  99         if (shallow_nr) {
 100                 argv[arg++] = "--shallow-file";
 101                 argv[arg++] = "";
 102         }
 103         argv[arg++] = "pack-objects";
 104         argv[arg++] = "--revs";
 105         if (use_thin_pack)
 106                 argv[arg++] = "--thin";
 107
 108         argv[arg++] = "--stdout";
 109         if (shallow_nr)
 110                 argv[arg++] = "--shallow";
 111         if (!no_progress)
 112                 argv[arg++] = "--progress";
 113         if (use_ofs_delta)
 114                 argv[arg++] = "--delta-base-offset";
 115         if (use_include_tag)
 116                 argv[arg++] = "--include-tag";
 117         argv[arg++] = NULL;
 118
 119         pack_objects.in = -1;
 120         pack_objects.out = -1;
 121         pack_objects.err = -1;
 122         pack_objects.git_cmd = 1;
 123         pack_objects.argv = argv;
 124
 125         if (start_command(&pack_objects))
 126                 die("git upload-pack: unable to fork git-pack-objects");
 127
 128         pipe_fd = xfdopen(pack_objects.in, "w");
 129
 130         if (shallow_nr)
 131                 for_each_commit_graft(write_one_shallow, pipe_fd);
 132
 133         for (i = 0; i < want_obj.nr; i++)
 134                 fprintf(pipe_fd, "%s\n",
 135                         oid_to_hex(&want_obj.objects[i].item->oid));
 136         fprintf(pipe_fd, "--not\n");
 137         for (i = 0; i < have_obj.nr; i++)
 138                 fprintf(pipe_fd, "%s\n",
 139                         oid_to_hex(&have_obj.objects[i].item->oid));
 140         for (i = 0; i < extra_edge_obj.nr; i++)
 141                 fprintf(pipe_fd, "%s\n",
 142                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 143         fprintf(pipe_fd, "\n");
 144         fflush(pipe_fd);
 145         fclose(pipe_fd);
 146
 147         /* We read from pack_objects.err to capture stderr output for
 148          * progress bar, and pack_objects.out to capture the pack data.
 149          */
 150
 151         while (1) {
 152                 struct pollfd pfd[2];
 153                 int pe, pu, pollsize;
 154                 int ret;
 155
 156                 reset_timeout();
 157
 158                 pollsize = 0;
 159                 pe = pu = -1;
 160
 161                 if (0 <= pack_objects.out) {
 162                         pfd[pollsize].fd = pack_objects.out;
 163                         pfd[pollsize].events = POLLIN;
 164                         pu = pollsize;
 165                         pollsize++;
 166                 }
 167                 if (0 <= pack_objects.err) {
 168                         pfd[pollsize].fd = pack_objects.err;
 169                         pfd[pollsize].events = POLLIN;
 170                         pe = pollsize;
 171                         pollsize++;
 172                 }
 173
 174                 if (!pollsize)
 175                         break;
 176
 177                 ret = poll(pfd, pollsize,
 178                         keepalive < 0 ? -1 : 1000 * keepalive);
 179
 180                 if (ret < 0) {
 181                         if (errno != EINTR) {
 182                                 error("poll failed, resuming: %s",
 183                                       strerror(errno));
 184                                 sleep(1);
 185                         }
 186                         continue;
 187                 }
 188                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 189                         /* Status ready; we ship that in the side-band
 190                          * or dump to the standard error.
 191                          */
 192                         sz = xread(pack_objects.err, progress,
 193                                   sizeof(progress));
 194                         if (0 < sz)
 195                                 send_client_data(2, progress, sz);
 196                         else if (sz == 0) {
 197                                 close(pack_objects.err);
 198                                 pack_objects.err = -1;
 199                         }
 200                         else
 201                                 goto fail;
 202                         /* give priority to status messages */
 203                         continue;
 204                 }
 205                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 206                         /* Data ready; we keep the last byte to ourselves
 207                          * in case we detect broken rev-list, so that we
 208                          * can leave the stream corrupted.  This is
 209                          * unfortunate -- unpack-objects would happily
 210                          * accept a valid packdata with trailing garbage,
 211                          * so appending garbage after we pass all the
 212                          * pack data is not good enough to signal
 213                          * breakage to downstream.
 214                          */
 215                         char *cp = data;
 216                         ssize_t outsz = 0;
 217                         if (0 <= buffered) {
 218                                 *cp++ = buffered;
 219                                 outsz++;
 220                         }
 221                         sz = xread(pack_objects.out, cp,
 222                                   sizeof(data) - outsz);
 223                         if (0 < sz)
 224                                 ;
 225                         else if (sz == 0) {
 226                                 close(pack_objects.out);
 227                                 pack_objects.out = -1;
 228                         }
 229                         else
 230                                 goto fail;
 231                         sz += outsz;
 232                         if (1 < sz) {
 233                                 buffered = data[sz-1] & 0xFF;
 234                                 sz--;
 235                         }
 236                         else
 237                                 buffered = -1;
 238                         sz = send_client_data(1, data, sz);
 239                         if (sz < 0)
 240                                 goto fail;
 241                 }
 242
 243                 /*
 244                  * We hit the keepalive timeout without saying anything; send
 245                  * an empty message on the data sideband just to let the other
 246                  * side know we're still working on it, but don't have any data
 247                  * yet.
 248                  *
 249                  * If we don't have a sideband channel, there's no room in the
 250                  * protocol to say anything, so those clients are just out of
 251                  * luck.
 252                  */
 253                 if (!ret && use_sideband) {
 254                         static const char buf[] = "0005\1";
 255                         write_or_die(1, buf, 5);
 256                 }
 257         }
 258
 259         if (finish_command(&pack_objects)) {
 260                 error("git upload-pack: git-pack-objects died with error.");
 261                 goto fail;
 262         }
 263
 264         /* flush the data */
 265         if (0 <= buffered) {
 266                 data[0] = buffered;
 267                 sz = send_client_data(1, data, 1);
 268                 if (sz < 0)
 269                         goto fail;
 270                 fprintf(stderr, "flushed.\n");
 271         }
 272         if (use_sideband)
 273                 packet_flush(1);
 274         return;
 275
 276  fail:
 277         send_client_data(3, abort_msg, sizeof(abort_msg));
 278         die("git upload-pack: %s", abort_msg);
 279 }
 280
 281 static int got_sha1(const char *hex, unsigned char *sha1)
 282 {
 283         struct object *o;
 284         int we_knew_they_have = 0;
 285
 286         if (get_sha1_hex(hex, sha1))
 287                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 288         if (!has_sha1_file(sha1))
 289                 return -1;
 290
 291         o = parse_object(sha1);
 292         if (!o)
 293                 die("oops (%s)", sha1_to_hex(sha1));
 294         if (o->type == OBJ_COMMIT) {
 295                 struct commit_list *parents;
 296                 struct commit *commit = (struct commit *)o;
 297                 if (o->flags & THEY_HAVE)
 298                         we_knew_they_have = 1;
 299                 else
 300                         o->flags |= THEY_HAVE;
 301                 if (!oldest_have || (commit->date < oldest_have))
 302                         oldest_have = commit->date;
 303                 for (parents = commit->parents;
 304                      parents;
 305                      parents = parents->next)
 306                         parents->item->object.flags |= THEY_HAVE;
 307         }
 308         if (!we_knew_they_have) {
 309                 add_object_array(o, NULL, &have_obj);
 310                 return 1;
 311         }
 312         return 0;
 313 }
 314
 315 static int reachable(struct commit *want)
 316 {
 317         struct commit_list *work = NULL;
 318
 319         commit_list_insert_by_date(want, &work);
 320         while (work) {
 321                 struct commit_list *list;
 322                 struct commit *commit = pop_commit(&work);
 323
 324                 if (commit->object.flags & THEY_HAVE) {
 325                         want->object.flags |= COMMON_KNOWN;
 326                         break;
 327                 }
 328                 if (!commit->object.parsed)
 329                         parse_object(commit->object.oid.hash);
 330                 if (commit->object.flags & REACHABLE)
 331                         continue;
 332                 commit->object.flags |= REACHABLE;
 333                 if (commit->date < oldest_have)
 334                         continue;
 335                 for (list = commit->parents; list; list = list->next) {
 336                         struct commit *parent = list->item;
 337                         if (!(parent->object.flags & REACHABLE))
 338                                 commit_list_insert_by_date(parent, &work);
 339                 }
 340         }
 341         want->object.flags |= REACHABLE;
 342         clear_commit_marks(want, REACHABLE);
 343         free_commit_list(work);
 344         return (want->object.flags & COMMON_KNOWN);
 345 }
 346
 347 static int ok_to_give_up(void)
 348 {
 349         int i;
 350
 351         if (!have_obj.nr)
 352                 return 0;
 353
 354         for (i = 0; i < want_obj.nr; i++) {
 355                 struct object *want = want_obj.objects[i].item;
 356
 357                 if (want->flags & COMMON_KNOWN)
 358                         continue;
 359                 want = deref_tag(want, "a want line", 0);
 360                 if (!want || want->type != OBJ_COMMIT) {
 361                         /* no way to tell if this is reachable by
 362                          * looking at the ancestry chain alone, so
 363                          * leave a note to ourselves not to worry about
 364                          * this object anymore.
 365                          */
 366                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 367                         continue;
 368                 }
 369                 if (!reachable((struct commit *)want))
 370                         return 0;
 371         }
 372         return 1;
 373 }
 374
 375 static int get_common_commits(void)
 376 {
 377         unsigned char sha1[20];
 378         char last_hex[41];
 379         int got_common = 0;
 380         int got_other = 0;
 381         int sent_ready = 0;
 382
 383         save_commit_buffer = 0;
 384
 385         for (;;) {
 386                 char *line = packet_read_line(0, NULL);
 387                 const char *arg;
 388
 389                 reset_timeout();
 390
 391                 if (!line) {
 392                         if (multi_ack == 2 && got_common
 393                             && !got_other && ok_to_give_up()) {
 394                                 sent_ready = 1;
 395                                 packet_write(1, "ACK %s ready\n", last_hex);
 396                         }
 397                         if (have_obj.nr == 0 || multi_ack)
 398                                 packet_write(1, "NAK\n");
 399
 400                         if (no_done && sent_ready) {
 401                                 packet_write(1, "ACK %s\n", last_hex);
 402                                 return 0;
 403                         }
 404                         if (stateless_rpc)
 405                                 exit(0);
 406                         got_common = 0;
 407                         got_other = 0;
 408                         continue;
 409                 }
 410                 if (skip_prefix(line, "have ", &arg)) {
 411                         switch (got_sha1(arg, sha1)) {
 412                         case -1: /* they have what we do not */
 413                                 got_other = 1;
 414                                 if (multi_ack && ok_to_give_up()) {
 415                                         const char *hex = sha1_to_hex(sha1);
 416                                         if (multi_ack == 2) {
 417                                                 sent_ready = 1;
 418                                                 packet_write(1, "ACK %s ready\n", hex);
 419                                         } else
 420                                                 packet_write(1, "ACK %s continue\n", hex);
 421                                 }
 422                                 break;
 423                         default:
 424                                 got_common = 1;
 425                                 memcpy(last_hex, sha1_to_hex(sha1), 41);
 426                                 if (multi_ack == 2)
 427                                         packet_write(1, "ACK %s common\n", last_hex);
 428                                 else if (multi_ack)
 429                                         packet_write(1, "ACK %s continue\n", last_hex);
 430                                 else if (have_obj.nr == 1)
 431                                         packet_write(1, "ACK %s\n", last_hex);
 432                                 break;
 433                         }
 434                         continue;
 435                 }
 436                 if (!strcmp(line, "done")) {
 437                         if (have_obj.nr > 0) {
 438                                 if (multi_ack)
 439                                         packet_write(1, "ACK %s\n", last_hex);
 440                                 return 0;
 441                         }
 442                         packet_write(1, "NAK\n");
 443                         return -1;
 444                 }
 445                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 446         }
 447 }
 448
 449 static int is_our_ref(struct object *o)
 450 {
 451         int allow_hidden_ref = (allow_unadvertised_object_request &
 452                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 453         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 454 }
 455
 456 /*
 457  * on successful case, it's up to the caller to close cmd->out
 458  */
 459 static int do_reachable_revlist(struct child_process *cmd,
 460                                 struct object_array *src,
 461                                 struct object_array *reachable)
 462 {
 463         static const char *argv[] = {
 464                 "rev-list", "--stdin", NULL,
 465         };
 466         struct object *o;
 467         char namebuf[42]; /* ^ + SHA-1 + LF */
 468         int i;
 469
 470         cmd->argv = argv;
 471         cmd->git_cmd = 1;
 472         cmd->no_stderr = 1;
 473         cmd->in = -1;
 474         cmd->out = -1;
 475
 476         /*
 477          * If the next rev-list --stdin encounters an unknown commit,
 478          * it terminates, which will cause SIGPIPE in the write loop
 479          * below.
 480          */
 481         sigchain_push(SIGPIPE, SIG_IGN);
 482
 483         if (start_command(cmd))
 484                 goto error;
 485
 486         namebuf[0] = '^';
 487         namebuf[41] = '\n';
 488         for (i = get_max_object_index(); 0 < i; ) {
 489                 o = get_indexed_object(--i);
 490                 if (!o)
 491                         continue;
 492                 if (reachable && o->type == OBJ_COMMIT)
 493                         o->flags &= ~TMP_MARK;
 494                 if (!is_our_ref(o))
 495                         continue;
 496                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 497                 if (write_in_full(cmd->in, namebuf, 42) < 0)
 498                         goto error;
 499         }
 500         namebuf[40] = '\n';
 501         for (i = 0; i < src->nr; i++) {
 502                 o = src->objects[i].item;
 503                 if (is_our_ref(o)) {
 504                         if (reachable)
 505                                 add_object_array(o, NULL, reachable);
 506                         continue;
 507                 }
 508                 if (reachable && o->type == OBJ_COMMIT)
 509                         o->flags |= TMP_MARK;
 510                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 511                 if (write_in_full(cmd->in, namebuf, 41) < 0)
 512                         goto error;
 513         }
 514         close(cmd->in);
 515         cmd->in = -1;
 516         sigchain_pop(SIGPIPE);
 517
 518         return 0;
 519
 520 error:
 521         sigchain_pop(SIGPIPE);
 522
 523         if (cmd->in >= 0)
 524                 close(cmd->in);
 525         if (cmd->out >= 0)
 526                 close(cmd->out);
 527         return -1;
 528 }
 529
 530 static int get_reachable_list(struct object_array *src,
 531                               struct object_array *reachable)
 532 {
 533         struct child_process cmd = CHILD_PROCESS_INIT;
 534         int i;
 535         struct object *o;
 536         char namebuf[42]; /* ^ + SHA-1 + LF */
 537
 538         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 539                 return -1;
 540
 541         while ((i = read_in_full(cmd.out, namebuf, 41)) == 41) {
 542                 struct object_id sha1;
 543
 544                 if (namebuf[40] != '\n' || get_oid_hex(namebuf, &sha1))
 545                         break;
 546
 547                 o = lookup_object(sha1.hash);
 548                 if (o && o->type == OBJ_COMMIT) {
 549                         o->flags &= ~TMP_MARK;
 550                 }
 551         }
 552         for (i = get_max_object_index(); 0 < i; i--) {
 553                 o = get_indexed_object(i - 1);
 554                 if (o && o->type == OBJ_COMMIT &&
 555                     (o->flags & TMP_MARK)) {
 556                         add_object_array(o, NULL, reachable);
 557                                 o->flags &= ~TMP_MARK;
 558                 }
 559         }
 560         close(cmd.out);
 561
 562         if (finish_command(&cmd))
 563                 return -1;
 564
 565         return 0;
 566 }
 567
 568 static int has_unreachable(struct object_array *src)
 569 {
 570         struct child_process cmd = CHILD_PROCESS_INIT;
 571         char buf[1];
 572         int i;
 573
 574         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 575                 return 1;
 576
 577         /*
 578          * The commits out of the rev-list are not ancestors of
 579          * our ref.
 580          */
 581         i = read_in_full(cmd.out, buf, 1);
 582         if (i)
 583                 goto error;
 584         close(cmd.out);
 585         cmd.out = -1;
 586
 587         /*
 588          * rev-list may have died by encountering a bad commit
 589          * in the history, in which case we do want to bail out
 590          * even when it showed no commit.
 591          */
 592         if (finish_command(&cmd))
 593                 goto error;
 594
 595         /* All the non-tip ones are ancestors of what we advertised */
 596         return 0;
 597
 598 error:
 599         sigchain_pop(SIGPIPE);
 600         if (cmd.out >= 0)
 601                 close(cmd.out);
 602         return 1;
 603 }
 604
 605 static void check_non_tip(void)
 606 {
 607         int i;
 608
 609         /*
 610          * In the normal in-process case without
 611          * uploadpack.allowReachableSHA1InWant,
 612          * non-tip requests can never happen.
 613          */
 614         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 615                 goto error;
 616         if (!has_unreachable(&want_obj))
 617                 /* All the non-tip ones are ancestors of what we advertised */
 618                 return;
 619
 620 error:
 621         /* Pick one of them (we know there at least is one) */
 622         for (i = 0; i < want_obj.nr; i++) {
 623                 struct object *o = want_obj.objects[i].item;
 624                 if (!is_our_ref(o))
 625                         die("git upload-pack: not our ref %s",
 626                             oid_to_hex(&o->oid));
 627         }
 628 }
 629
 630 static void send_shallow(struct commit_list *result)
 631 {
 632         while (result) {
 633                 struct object *object = &result->item->object;
 634                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 635                         packet_write(1, "shallow %s",
 636                                      oid_to_hex(&object->oid));
 637                         register_shallow(object->oid.hash);
 638                         shallow_nr++;
 639                 }
 640                 result = result->next;
 641         }
 642 }
 643
 644 static void send_unshallow(const struct object_array *shallows)
 645 {
 646         int i;
 647
 648         for (i = 0; i < shallows->nr; i++) {
 649                 struct object *object = shallows->objects[i].item;
 650                 if (object->flags & NOT_SHALLOW) {
 651                         struct commit_list *parents;
 652                         packet_write(1, "unshallow %s",
 653                                      oid_to_hex(&object->oid));
 654                         object->flags &= ~CLIENT_SHALLOW;
 655                         /*
 656                          * We want to _register_ "object" as shallow, but we
 657                          * also need to traverse object's parents to deepen a
 658                          * shallow clone. Unregister it for now so we can
 659                          * parse and add the parents to the want list, then
 660                          * re-register it.
 661                          */
 662                         unregister_shallow(object->oid.hash);
 663                         object->parsed = 0;
 664                         parse_commit_or_die((struct commit *)object);
 665                         parents = ((struct commit *)object)->parents;
 666                         while (parents) {
 667                                 add_object_array(&parents->item->object,
 668                                                  NULL, &want_obj);
 669                                 parents = parents->next;
 670                         }
 671                         add_object_array(object, NULL, &extra_edge_obj);
 672                 }
 673                 /* make sure commit traversal conforms to client */
 674                 register_shallow(object->oid.hash);
 675         }
 676 }
 677
 678 static void deepen(int depth, int deepen_relative,
 679                    struct object_array *shallows)
 680 {
 681         if (depth == INFINITE_DEPTH && !is_repository_shallow()) {
 682                 int i;
 683
 684                 for (i = 0; i < shallows->nr; i++) {
 685                         struct object *object = shallows->objects[i].item;
 686                         object->flags |= NOT_SHALLOW;
 687                 }
 688         } else if (deepen_relative) {
 689                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 690                 struct commit_list *result;
 691
 692                 get_reachable_list(shallows, &reachable_shallows);
 693                 result = get_shallow_commits(&reachable_shallows,
 694                                              depth + 1,
 695                                              SHALLOW, NOT_SHALLOW);
 696                 send_shallow(result);
 697                 free_commit_list(result);
 698                 object_array_clear(&reachable_shallows);
 699         } else {
 700                 struct commit_list *result;
 701
 702                 result = get_shallow_commits(&want_obj, depth,
 703                                              SHALLOW, NOT_SHALLOW);
 704                 send_shallow(result);
 705                 free_commit_list(result);
 706         }
 707
 708         send_unshallow(shallows);
 709         packet_flush(1);
 710 }
 711
 712 static void deepen_by_rev_list(int ac, const char **av,
 713                                struct object_array *shallows)
 714 {
 715         struct commit_list *result;
 716
 717         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 718         send_shallow(result);
 719         free_commit_list(result);
 720         send_unshallow(shallows);
 721         packet_flush(1);
 722 }
 723
 724 static void receive_needs(void)
 725 {
 726         struct object_array shallows = OBJECT_ARRAY_INIT;
 727         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 728         int depth = 0;
 729         int has_non_tip = 0;
 730         unsigned long deepen_since = 0;
 731         int deepen_rev_list = 0;
 732
 733         shallow_nr = 0;
 734         for (;;) {
 735                 struct object *o;
 736                 const char *features;
 737                 unsigned char sha1_buf[20];
 738                 char *line = packet_read_line(0, NULL);
 739                 const char *arg;
 740
 741                 reset_timeout();
 742                 if (!line)
 743                         break;
 744
 745                 if (skip_prefix(line, "shallow ", &arg)) {
 746                         unsigned char sha1[20];
 747                         struct object *object;
 748                         if (get_sha1_hex(arg, sha1))
 749                                 die("invalid shallow line: %s", line);
 750                         object = parse_object(sha1);
 751                         if (!object)
 752                                 continue;
 753                         if (object->type != OBJ_COMMIT)
 754                                 die("invalid shallow object %s", sha1_to_hex(sha1));
 755                         if (!(object->flags & CLIENT_SHALLOW)) {
 756                                 object->flags |= CLIENT_SHALLOW;
 757                                 add_object_array(object, NULL, &shallows);
 758                         }
 759                         continue;
 760                 }
 761                 if (skip_prefix(line, "deepen ", &arg)) {
 762                         char *end = NULL;
 763                         depth = strtol(arg, &end, 0);
 764                         if (!end || *end || depth <= 0)
 765                                 die("Invalid deepen: %s", line);
 766                         continue;
 767                 }
 768                 if (skip_prefix(line, "deepen-since ", &arg)) {
 769                         char *end = NULL;
 770                         deepen_since = strtoul(arg, &end, 0);
 771                         if (!end || *end || !deepen_since ||
 772                             /* revisions.c's max_age -1 is special */
 773                             deepen_since == -1)
 774                                 die("Invalid deepen-since: %s", line);
 775                         deepen_rev_list = 1;
 776                         continue;
 777                 }
 778                 if (skip_prefix(line, "deepen-not ", &arg)) {
 779                         char *ref = NULL;
 780                         unsigned char sha1[20];
 781                         if (expand_ref(arg, strlen(arg), sha1, &ref) != 1)
 782                                 die("git upload-pack: ambiguous deepen-not: %s", line);
 783                         string_list_append(&deepen_not, ref);
 784                         free(ref);
 785                         deepen_rev_list = 1;
 786                         continue;
 787                 }
 788                 if (!skip_prefix(line, "want ", &arg) ||
 789                     get_sha1_hex(arg, sha1_buf))
 790                         die("git upload-pack: protocol error, "
 791                             "expected to get sha, not '%s'", line);
 792
 793                 features = arg + 40;
 794
 795                 if (parse_feature_request(features, "deepen-relative"))
 796                         deepen_relative = 1;
 797                 if (parse_feature_request(features, "multi_ack_detailed"))
 798                         multi_ack = 2;
 799                 else if (parse_feature_request(features, "multi_ack"))
 800                         multi_ack = 1;
 801                 if (parse_feature_request(features, "no-done"))
 802                         no_done = 1;
 803                 if (parse_feature_request(features, "thin-pack"))
 804                         use_thin_pack = 1;
 805                 if (parse_feature_request(features, "ofs-delta"))
 806                         use_ofs_delta = 1;
 807                 if (parse_feature_request(features, "side-band-64k"))
 808                         use_sideband = LARGE_PACKET_MAX;
 809                 else if (parse_feature_request(features, "side-band"))
 810                         use_sideband = DEFAULT_PACKET_MAX;
 811                 if (parse_feature_request(features, "no-progress"))
 812                         no_progress = 1;
 813                 if (parse_feature_request(features, "include-tag"))
 814                         use_include_tag = 1;
 815
 816                 o = parse_object(sha1_buf);
 817                 if (!o)
 818                         die("git upload-pack: not our ref %s",
 819                             sha1_to_hex(sha1_buf));
 820                 if (!(o->flags & WANTED)) {
 821                         o->flags |= WANTED;
 822                         if (!is_our_ref(o))
 823                                 has_non_tip = 1;
 824                         add_object_array(o, NULL, &want_obj);
 825                 }
 826         }
 827
 828         /*
 829          * We have sent all our refs already, and the other end
 830          * should have chosen out of them. When we are operating
 831          * in the stateless RPC mode, however, their choice may
 832          * have been based on the set of older refs advertised
 833          * by another process that handled the initial request.
 834          */
 835         if (has_non_tip)
 836                 check_non_tip();
 837
 838         if (!use_sideband && daemon_mode)
 839                 no_progress = 1;
 840
 841         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 842                 return;
 843         if (depth > 0 && deepen_rev_list)
 844                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 845         if (depth > 0)
 846                 deepen(depth, deepen_relative, &shallows);
 847         else if (deepen_rev_list) {
 848                 struct argv_array av = ARGV_ARRAY_INIT;
 849                 int i;
 850
 851                 argv_array_push(&av, "rev-list");
 852                 if (deepen_since)
 853                         argv_array_pushf(&av, "--max-age=%lu", deepen_since);
 854                 if (deepen_not.nr) {
 855                         argv_array_push(&av, "--not");
 856                         for (i = 0; i < deepen_not.nr; i++) {
 857                                 struct string_list_item *s = deepen_not.items + i;
 858                                 argv_array_push(&av, s->string);
 859                         }
 860                         argv_array_push(&av, "--not");
 861                 }
 862                 for (i = 0; i < want_obj.nr; i++) {
 863                         struct object *o = want_obj.objects[i].item;
 864                         argv_array_push(&av, oid_to_hex(&o->oid));
 865                 }
 866                 deepen_by_rev_list(av.argc, av.argv, &shallows);
 867                 argv_array_clear(&av);
 868         }
 869         else
 870                 if (shallows.nr > 0) {
 871                         int i;
 872                         for (i = 0; i < shallows.nr; i++)
 873                                 register_shallow(shallows.objects[i].item->oid.hash);
 874                 }
 875
 876         shallow_nr += shallows.nr;
 877         free(shallows.objects);
 878 }
 879
 880 /* return non-zero if the ref is hidden, otherwise 0 */
 881 static int mark_our_ref(const char *refname, const char *refname_full,
 882                         const struct object_id *oid)
 883 {
 884         struct object *o = lookup_unknown_object(oid->hash);
 885
 886         if (ref_is_hidden(refname, refname_full)) {
 887                 o->flags |= HIDDEN_REF;
 888                 return 1;
 889         }
 890         o->flags |= OUR_REF;
 891         return 0;
 892 }
 893
 894 static int check_ref(const char *refname_full, const struct object_id *oid,
 895                      int flag, void *cb_data)
 896 {
 897         const char *refname = strip_namespace(refname_full);
 898
 899         mark_our_ref(refname, refname_full, oid);
 900         return 0;
 901 }
 902
 903 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 904 {
 905         struct string_list_item *item;
 906
 907         if (!symref->nr)
 908                 return;
 909         for_each_string_list_item(item, symref)
 910                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 911 }
 912
 913 static int send_ref(const char *refname, const struct object_id *oid,
 914                     int flag, void *cb_data)
 915 {
 916         static const char *capabilities = "multi_ack thin-pack side-band"
 917                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 918                 " deepen-relative no-progress include-tag multi_ack_detailed";
 919         const char *refname_nons = strip_namespace(refname);
 920         struct object_id peeled;
 921
 922         if (mark_our_ref(refname_nons, refname, oid))
 923                 return 0;
 924
 925         if (capabilities) {
 926                 struct strbuf symref_info = STRBUF_INIT;
 927
 928                 format_symref_info(&symref_info, cb_data);
 929                 packet_write(1, "%s %s%c%s%s%s%s%s agent=%s\n",
 930                              oid_to_hex(oid), refname_nons,
 931                              0, capabilities,
 932                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 933                                      " allow-tip-sha1-in-want" : "",
 934                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 935                                      " allow-reachable-sha1-in-want" : "",
 936                              stateless_rpc ? " no-done" : "",
 937                              symref_info.buf,
 938                              git_user_agent_sanitized());
 939                 strbuf_release(&symref_info);
 940         } else {
 941                 packet_write(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 942         }
 943         capabilities = NULL;
 944         if (!peel_ref(refname, peeled.hash))
 945                 packet_write(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 946         return 0;
 947 }
 948
 949 static int find_symref(const char *refname, const struct object_id *oid,
 950                        int flag, void *cb_data)
 951 {
 952         const char *symref_target;
 953         struct string_list_item *item;
 954         struct object_id unused;
 955
 956         if ((flag & REF_ISSYMREF) == 0)
 957                 return 0;
 958         symref_target = resolve_ref_unsafe(refname, 0, unused.hash, &flag);
 959         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 960                 die("'%s' is a symref but it is not?", refname);
 961         item = string_list_append(cb_data, refname);
 962         item->util = xstrdup(symref_target);
 963         return 0;
 964 }
 965
 966 static void upload_pack(void)
 967 {
 968         struct string_list symref = STRING_LIST_INIT_DUP;
 969
 970         head_ref_namespaced(find_symref, &symref);
 971
 972         if (advertise_refs || !stateless_rpc) {
 973                 reset_timeout();
 974                 head_ref_namespaced(send_ref, &symref);
 975                 for_each_namespaced_ref(send_ref, &symref);
 976                 advertise_shallow_grafts(1);
 977                 packet_flush(1);
 978         } else {
 979                 head_ref_namespaced(check_ref, NULL);
 980                 for_each_namespaced_ref(check_ref, NULL);
 981         }
 982         string_list_clear(&symref, 1);
 983         if (advertise_refs)
 984                 return;
 985
 986         receive_needs();
 987         if (want_obj.nr) {
 988                 get_common_commits();
 989                 create_pack_file();
 990         }
 991 }
 992
 993 static int upload_pack_config(const char *var, const char *value, void *unused)
 994 {
 995         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
 996                 if (git_config_bool(var, value))
 997                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
 998                 else
 999                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1000         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1001                 if (git_config_bool(var, value))
1002                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1003                 else
1004                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1005         } else if (!strcmp("uploadpack.keepalive", var)) {
1006                 keepalive = git_config_int(var, value);
1007                 if (!keepalive)
1008                         keepalive = -1;
1009         }
1010         return parse_hide_refs_config(var, value, "uploadpack");
1011 }
1012
1013 int main(int argc, char **argv)
1014 {
1015         char *dir;
1016         int i;
1017         int strict = 0;
1018
1019         git_setup_gettext();
1020
1021         packet_trace_identity("upload-pack");
1022         git_extract_argv0_path(argv[0]);
1023         check_replace_refs = 0;
1024
1025         for (i = 1; i < argc; i++) {
1026                 const char *arg = argv[i];
1027
1028                 if (arg[0] != '-')
1029                         break;
1030                 if (!strcmp(arg, "--advertise-refs")) {
1031                         advertise_refs = 1;
1032                         continue;
1033                 }
1034                 if (!strcmp(arg, "--stateless-rpc")) {
1035                         stateless_rpc = 1;
1036                         continue;
1037                 }
1038                 if (!strcmp(arg, "--strict")) {
1039                         strict = 1;
1040                         continue;
1041                 }
1042                 if (skip_prefix(arg, "--timeout=", &arg)) {
1043                         timeout = atoi(arg);
1044                         daemon_mode = 1;
1045                         continue;
1046                 }
1047                 if (!strcmp(arg, "--")) {
1048                         i++;
1049                         break;
1050                 }
1051         }
1052
1053         if (i != argc-1)
1054                 usage(upload_pack_usage);
1055
1056         setup_path();
1057
1058         dir = argv[i];
1059
1060         if (!enter_repo(dir, strict))
1061                 die("'%s' does not appear to be a git repository", dir);
1062
1063         git_config(upload_pack_config, NULL);
1064         upload_pack();
1065         return 0;
1066 }