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

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "tag.h"
   7 #include "object.h"
   8 #include "commit.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 #include "prio-queue.h"
  19 #include "protocol.h"
  20 #include "upload-pack.h"
  21
  22 /* Remember to update object flag allocation in object.h */
  23 #define THEY_HAVE       (1u << 11)
  24 #define OUR_REF         (1u << 12)
  25 #define WANTED          (1u << 13)
  26 #define COMMON_KNOWN    (1u << 14)
  27 #define REACHABLE       (1u << 15)
  28
  29 #define SHALLOW         (1u << 16)
  30 #define NOT_SHALLOW     (1u << 17)
  31 #define CLIENT_SHALLOW  (1u << 18)
  32 #define HIDDEN_REF      (1u << 19)
  33
  34 static timestamp_t oldest_have;
  35
  36 static int deepen_relative;
  37 static int multi_ack;
  38 static int no_done;
  39 static int use_thin_pack, use_ofs_delta, use_include_tag;
  40 static int no_progress, daemon_mode;
  41 /* Allow specifying sha1 if it is a ref tip. */
  42 #define ALLOW_TIP_SHA1  01
  43 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  44 #define ALLOW_REACHABLE_SHA1    02
  45 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  46 #define ALLOW_ANY_SHA1  07
  47 static unsigned int allow_unadvertised_object_request;
  48 static int shallow_nr;
  49 static struct object_array have_obj;
  50 static struct object_array want_obj;
  51 static struct object_array extra_edge_obj;
  52 static unsigned int timeout;
  53 static int keepalive = 5;
  54 /* 0 for no sideband,
  55  * otherwise maximum packet size (up to 65520 bytes).
  56  */
  57 static int use_sideband;
  58 static int stateless_rpc;
  59 static const char *pack_objects_hook;
  60
  61 static void reset_timeout(void)
  62 {
  63         alarm(timeout);
  64 }
  65
  66 static void send_client_data(int fd, const char *data, ssize_t sz)
  67 {
  68         if (use_sideband) {
  69                 send_sideband(1, fd, data, sz, use_sideband);
  70                 return;
  71         }
  72         if (fd == 3)
  73                 /* emergency quit */
  74                 fd = 2;
  75         if (fd == 2) {
  76                 /* XXX: are we happy to lose stuff here? */
  77                 xwrite(fd, data, sz);
  78                 return;
  79         }
  80         write_or_die(fd, data, sz);
  81 }
  82
  83 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  84 {
  85         FILE *fp = cb_data;
  86         if (graft->nr_parent == -1)
  87                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  88         return 0;
  89 }
  90
  91 static void create_pack_file(void)
  92 {
  93         struct child_process pack_objects = CHILD_PROCESS_INIT;
  94         char data[8193], progress[128];
  95         char abort_msg[] = "aborting due to possible repository "
  96                 "corruption on the remote side.";
  97         int buffered = -1;
  98         ssize_t sz;
  99         int i;
 100         FILE *pipe_fd;
 101
 102         if (!pack_objects_hook)
 103                 pack_objects.git_cmd = 1;
 104         else {
 105                 argv_array_push(&pack_objects.args, pack_objects_hook);
 106                 argv_array_push(&pack_objects.args, "git");
 107                 pack_objects.use_shell = 1;
 108         }
 109
 110         if (shallow_nr) {
 111                 argv_array_push(&pack_objects.args, "--shallow-file");
 112                 argv_array_push(&pack_objects.args, "");
 113         }
 114         argv_array_push(&pack_objects.args, "pack-objects");
 115         argv_array_push(&pack_objects.args, "--revs");
 116         if (use_thin_pack)
 117                 argv_array_push(&pack_objects.args, "--thin");
 118
 119         argv_array_push(&pack_objects.args, "--stdout");
 120         if (shallow_nr)
 121                 argv_array_push(&pack_objects.args, "--shallow");
 122         if (!no_progress)
 123                 argv_array_push(&pack_objects.args, "--progress");
 124         if (use_ofs_delta)
 125                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 126         if (use_include_tag)
 127                 argv_array_push(&pack_objects.args, "--include-tag");
 128
 129         pack_objects.in = -1;
 130         pack_objects.out = -1;
 131         pack_objects.err = -1;
 132
 133         if (start_command(&pack_objects))
 134                 die("git upload-pack: unable to fork git-pack-objects");
 135
 136         pipe_fd = xfdopen(pack_objects.in, "w");
 137
 138         if (shallow_nr)
 139                 for_each_commit_graft(write_one_shallow, pipe_fd);
 140
 141         for (i = 0; i < want_obj.nr; i++)
 142                 fprintf(pipe_fd, "%s\n",
 143                         oid_to_hex(&want_obj.objects[i].item->oid));
 144         fprintf(pipe_fd, "--not\n");
 145         for (i = 0; i < have_obj.nr; i++)
 146                 fprintf(pipe_fd, "%s\n",
 147                         oid_to_hex(&have_obj.objects[i].item->oid));
 148         for (i = 0; i < extra_edge_obj.nr; i++)
 149                 fprintf(pipe_fd, "%s\n",
 150                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 151         fprintf(pipe_fd, "\n");
 152         fflush(pipe_fd);
 153         fclose(pipe_fd);
 154
 155         /* We read from pack_objects.err to capture stderr output for
 156          * progress bar, and pack_objects.out to capture the pack data.
 157          */
 158
 159         while (1) {
 160                 struct pollfd pfd[2];
 161                 int pe, pu, pollsize;
 162                 int ret;
 163
 164                 reset_timeout();
 165
 166                 pollsize = 0;
 167                 pe = pu = -1;
 168
 169                 if (0 <= pack_objects.out) {
 170                         pfd[pollsize].fd = pack_objects.out;
 171                         pfd[pollsize].events = POLLIN;
 172                         pu = pollsize;
 173                         pollsize++;
 174                 }
 175                 if (0 <= pack_objects.err) {
 176                         pfd[pollsize].fd = pack_objects.err;
 177                         pfd[pollsize].events = POLLIN;
 178                         pe = pollsize;
 179                         pollsize++;
 180                 }
 181
 182                 if (!pollsize)
 183                         break;
 184
 185                 ret = poll(pfd, pollsize,
 186                         keepalive < 0 ? -1 : 1000 * keepalive);
 187
 188                 if (ret < 0) {
 189                         if (errno != EINTR) {
 190                                 error_errno("poll failed, resuming");
 191                                 sleep(1);
 192                         }
 193                         continue;
 194                 }
 195                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 196                         /* Status ready; we ship that in the side-band
 197                          * or dump to the standard error.
 198                          */
 199                         sz = xread(pack_objects.err, progress,
 200                                   sizeof(progress));
 201                         if (0 < sz)
 202                                 send_client_data(2, progress, sz);
 203                         else if (sz == 0) {
 204                                 close(pack_objects.err);
 205                                 pack_objects.err = -1;
 206                         }
 207                         else
 208                                 goto fail;
 209                         /* give priority to status messages */
 210                         continue;
 211                 }
 212                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 213                         /* Data ready; we keep the last byte to ourselves
 214                          * in case we detect broken rev-list, so that we
 215                          * can leave the stream corrupted.  This is
 216                          * unfortunate -- unpack-objects would happily
 217                          * accept a valid packdata with trailing garbage,
 218                          * so appending garbage after we pass all the
 219                          * pack data is not good enough to signal
 220                          * breakage to downstream.
 221                          */
 222                         char *cp = data;
 223                         ssize_t outsz = 0;
 224                         if (0 <= buffered) {
 225                                 *cp++ = buffered;
 226                                 outsz++;
 227                         }
 228                         sz = xread(pack_objects.out, cp,
 229                                   sizeof(data) - outsz);
 230                         if (0 < sz)
 231                                 ;
 232                         else if (sz == 0) {
 233                                 close(pack_objects.out);
 234                                 pack_objects.out = -1;
 235                         }
 236                         else
 237                                 goto fail;
 238                         sz += outsz;
 239                         if (1 < sz) {
 240                                 buffered = data[sz-1] & 0xFF;
 241                                 sz--;
 242                         }
 243                         else
 244                                 buffered = -1;
 245                         send_client_data(1, data, sz);
 246                 }
 247
 248                 /*
 249                  * We hit the keepalive timeout without saying anything; send
 250                  * an empty message on the data sideband just to let the other
 251                  * side know we're still working on it, but don't have any data
 252                  * yet.
 253                  *
 254                  * If we don't have a sideband channel, there's no room in the
 255                  * protocol to say anything, so those clients are just out of
 256                  * luck.
 257                  */
 258                 if (!ret && use_sideband) {
 259                         static const char buf[] = "0005\1";
 260                         write_or_die(1, buf, 5);
 261                 }
 262         }
 263
 264         if (finish_command(&pack_objects)) {
 265                 error("git upload-pack: git-pack-objects died with error.");
 266                 goto fail;
 267         }
 268
 269         /* flush the data */
 270         if (0 <= buffered) {
 271                 data[0] = buffered;
 272                 send_client_data(1, data, 1);
 273                 fprintf(stderr, "flushed.\n");
 274         }
 275         if (use_sideband)
 276                 packet_flush(1);
 277         return;
 278
 279  fail:
 280         send_client_data(3, abort_msg, sizeof(abort_msg));
 281         die("git upload-pack: %s", abort_msg);
 282 }
 283
 284 static int got_oid(const char *hex, struct object_id *oid)
 285 {
 286         struct object *o;
 287         int we_knew_they_have = 0;
 288
 289         if (get_oid_hex(hex, oid))
 290                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 291         if (!has_object_file(oid))
 292                 return -1;
 293
 294         o = parse_object(oid);
 295         if (!o)
 296                 die("oops (%s)", oid_to_hex(oid));
 297         if (o->type == OBJ_COMMIT) {
 298                 struct commit_list *parents;
 299                 struct commit *commit = (struct commit *)o;
 300                 if (o->flags & THEY_HAVE)
 301                         we_knew_they_have = 1;
 302                 else
 303                         o->flags |= THEY_HAVE;
 304                 if (!oldest_have || (commit->date < oldest_have))
 305                         oldest_have = commit->date;
 306                 for (parents = commit->parents;
 307                      parents;
 308                      parents = parents->next)
 309                         parents->item->object.flags |= THEY_HAVE;
 310         }
 311         if (!we_knew_they_have) {
 312                 add_object_array(o, NULL, &have_obj);
 313                 return 1;
 314         }
 315         return 0;
 316 }
 317
 318 static int reachable(struct commit *want)
 319 {
 320         struct prio_queue work = { compare_commits_by_commit_date };
 321
 322         prio_queue_put(&work, want);
 323         while (work.nr) {
 324                 struct commit_list *list;
 325                 struct commit *commit = prio_queue_get(&work);
 326
 327                 if (commit->object.flags & THEY_HAVE) {
 328                         want->object.flags |= COMMON_KNOWN;
 329                         break;
 330                 }
 331                 if (!commit->object.parsed)
 332                         parse_object(&commit->object.oid);
 333                 if (commit->object.flags & REACHABLE)
 334                         continue;
 335                 commit->object.flags |= REACHABLE;
 336                 if (commit->date < oldest_have)
 337                         continue;
 338                 for (list = commit->parents; list; list = list->next) {
 339                         struct commit *parent = list->item;
 340                         if (!(parent->object.flags & REACHABLE))
 341                                 prio_queue_put(&work, parent);
 342                 }
 343         }
 344         want->object.flags |= REACHABLE;
 345         clear_commit_marks(want, REACHABLE);
 346         clear_prio_queue(&work);
 347         return (want->object.flags & COMMON_KNOWN);
 348 }
 349
 350 static int ok_to_give_up(void)
 351 {
 352         int i;
 353
 354         if (!have_obj.nr)
 355                 return 0;
 356
 357         for (i = 0; i < want_obj.nr; i++) {
 358                 struct object *want = want_obj.objects[i].item;
 359
 360                 if (want->flags & COMMON_KNOWN)
 361                         continue;
 362                 want = deref_tag(want, "a want line", 0);
 363                 if (!want || want->type != OBJ_COMMIT) {
 364                         /* no way to tell if this is reachable by
 365                          * looking at the ancestry chain alone, so
 366                          * leave a note to ourselves not to worry about
 367                          * this object anymore.
 368                          */
 369                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 370                         continue;
 371                 }
 372                 if (!reachable((struct commit *)want))
 373                         return 0;
 374         }
 375         return 1;
 376 }
 377
 378 static int get_common_commits(void)
 379 {
 380         struct object_id oid;
 381         char last_hex[GIT_MAX_HEXSZ + 1];
 382         int got_common = 0;
 383         int got_other = 0;
 384         int sent_ready = 0;
 385
 386         save_commit_buffer = 0;
 387
 388         for (;;) {
 389                 char *line = packet_read_line(0, NULL);
 390                 const char *arg;
 391
 392                 reset_timeout();
 393
 394                 if (!line) {
 395                         if (multi_ack == 2 && got_common
 396                             && !got_other && ok_to_give_up()) {
 397                                 sent_ready = 1;
 398                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 399                         }
 400                         if (have_obj.nr == 0 || multi_ack)
 401                                 packet_write_fmt(1, "NAK\n");
 402
 403                         if (no_done && sent_ready) {
 404                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 405                                 return 0;
 406                         }
 407                         if (stateless_rpc)
 408                                 exit(0);
 409                         got_common = 0;
 410                         got_other = 0;
 411                         continue;
 412                 }
 413                 if (skip_prefix(line, "have ", &arg)) {
 414                         switch (got_oid(arg, &oid)) {
 415                         case -1: /* they have what we do not */
 416                                 got_other = 1;
 417                                 if (multi_ack && ok_to_give_up()) {
 418                                         const char *hex = oid_to_hex(&oid);
 419                                         if (multi_ack == 2) {
 420                                                 sent_ready = 1;
 421                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 422                                         } else
 423                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 424                                 }
 425                                 break;
 426                         default:
 427                                 got_common = 1;
 428                                 memcpy(last_hex, oid_to_hex(&oid), 41);
 429                                 if (multi_ack == 2)
 430                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 431                                 else if (multi_ack)
 432                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 433                                 else if (have_obj.nr == 1)
 434                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 435                                 break;
 436                         }
 437                         continue;
 438                 }
 439                 if (!strcmp(line, "done")) {
 440                         if (have_obj.nr > 0) {
 441                                 if (multi_ack)
 442                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 443                                 return 0;
 444                         }
 445                         packet_write_fmt(1, "NAK\n");
 446                         return -1;
 447                 }
 448                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 449         }
 450 }
 451
 452 static int is_our_ref(struct object *o)
 453 {
 454         int allow_hidden_ref = (allow_unadvertised_object_request &
 455                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 456         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 457 }
 458
 459 /*
 460  * on successful case, it's up to the caller to close cmd->out
 461  */
 462 static int do_reachable_revlist(struct child_process *cmd,
 463                                 struct object_array *src,
 464                                 struct object_array *reachable)
 465 {
 466         static const char *argv[] = {
 467                 "rev-list", "--stdin", NULL,
 468         };
 469         struct object *o;
 470         char namebuf[42]; /* ^ + SHA-1 + LF */
 471         int i;
 472
 473         cmd->argv = argv;
 474         cmd->git_cmd = 1;
 475         cmd->no_stderr = 1;
 476         cmd->in = -1;
 477         cmd->out = -1;
 478
 479         /*
 480          * If the next rev-list --stdin encounters an unknown commit,
 481          * it terminates, which will cause SIGPIPE in the write loop
 482          * below.
 483          */
 484         sigchain_push(SIGPIPE, SIG_IGN);
 485
 486         if (start_command(cmd))
 487                 goto error;
 488
 489         namebuf[0] = '^';
 490         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 491         for (i = get_max_object_index(); 0 < i; ) {
 492                 o = get_indexed_object(--i);
 493                 if (!o)
 494                         continue;
 495                 if (reachable && o->type == OBJ_COMMIT)
 496                         o->flags &= ~TMP_MARK;
 497                 if (!is_our_ref(o))
 498                         continue;
 499                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 500                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 501                         goto error;
 502         }
 503         namebuf[GIT_SHA1_HEXSZ] = '\n';
 504         for (i = 0; i < src->nr; i++) {
 505                 o = src->objects[i].item;
 506                 if (is_our_ref(o)) {
 507                         if (reachable)
 508                                 add_object_array(o, NULL, reachable);
 509                         continue;
 510                 }
 511                 if (reachable && o->type == OBJ_COMMIT)
 512                         o->flags |= TMP_MARK;
 513                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 514                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 515                         goto error;
 516         }
 517         close(cmd->in);
 518         cmd->in = -1;
 519         sigchain_pop(SIGPIPE);
 520
 521         return 0;
 522
 523 error:
 524         sigchain_pop(SIGPIPE);
 525
 526         if (cmd->in >= 0)
 527                 close(cmd->in);
 528         if (cmd->out >= 0)
 529                 close(cmd->out);
 530         return -1;
 531 }
 532
 533 static int get_reachable_list(struct object_array *src,
 534                               struct object_array *reachable)
 535 {
 536         struct child_process cmd = CHILD_PROCESS_INIT;
 537         int i;
 538         struct object *o;
 539         char namebuf[42]; /* ^ + SHA-1 + LF */
 540
 541         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 542                 return -1;
 543
 544         while ((i = read_in_full(cmd.out, namebuf, 41)) == 41) {
 545                 struct object_id sha1;
 546
 547                 if (namebuf[40] != '\n' || get_oid_hex(namebuf, &sha1))
 548                         break;
 549
 550                 o = lookup_object(sha1.hash);
 551                 if (o && o->type == OBJ_COMMIT) {
 552                         o->flags &= ~TMP_MARK;
 553                 }
 554         }
 555         for (i = get_max_object_index(); 0 < i; i--) {
 556                 o = get_indexed_object(i - 1);
 557                 if (o && o->type == OBJ_COMMIT &&
 558                     (o->flags & TMP_MARK)) {
 559                         add_object_array(o, NULL, reachable);
 560                                 o->flags &= ~TMP_MARK;
 561                 }
 562         }
 563         close(cmd.out);
 564
 565         if (finish_command(&cmd))
 566                 return -1;
 567
 568         return 0;
 569 }
 570
 571 static int has_unreachable(struct object_array *src)
 572 {
 573         struct child_process cmd = CHILD_PROCESS_INIT;
 574         char buf[1];
 575         int i;
 576
 577         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 578                 return 1;
 579
 580         /*
 581          * The commits out of the rev-list are not ancestors of
 582          * our ref.
 583          */
 584         i = read_in_full(cmd.out, buf, 1);
 585         if (i)
 586                 goto error;
 587         close(cmd.out);
 588         cmd.out = -1;
 589
 590         /*
 591          * rev-list may have died by encountering a bad commit
 592          * in the history, in which case we do want to bail out
 593          * even when it showed no commit.
 594          */
 595         if (finish_command(&cmd))
 596                 goto error;
 597
 598         /* All the non-tip ones are ancestors of what we advertised */
 599         return 0;
 600
 601 error:
 602         sigchain_pop(SIGPIPE);
 603         if (cmd.out >= 0)
 604                 close(cmd.out);
 605         return 1;
 606 }
 607
 608 static void check_non_tip(void)
 609 {
 610         int i;
 611
 612         /*
 613          * In the normal in-process case without
 614          * uploadpack.allowReachableSHA1InWant,
 615          * non-tip requests can never happen.
 616          */
 617         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 618                 goto error;
 619         if (!has_unreachable(&want_obj))
 620                 /* All the non-tip ones are ancestors of what we advertised */
 621                 return;
 622
 623 error:
 624         /* Pick one of them (we know there at least is one) */
 625         for (i = 0; i < want_obj.nr; i++) {
 626                 struct object *o = want_obj.objects[i].item;
 627                 if (!is_our_ref(o))
 628                         die("git upload-pack: not our ref %s",
 629                             oid_to_hex(&o->oid));
 630         }
 631 }
 632
 633 static void send_shallow(struct commit_list *result)
 634 {
 635         while (result) {
 636                 struct object *object = &result->item->object;
 637                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 638                         packet_write_fmt(1, "shallow %s",
 639                                          oid_to_hex(&object->oid));
 640                         register_shallow(&object->oid);
 641                         shallow_nr++;
 642                 }
 643                 result = result->next;
 644         }
 645 }
 646
 647 static void send_unshallow(const struct object_array *shallows)
 648 {
 649         int i;
 650
 651         for (i = 0; i < shallows->nr; i++) {
 652                 struct object *object = shallows->objects[i].item;
 653                 if (object->flags & NOT_SHALLOW) {
 654                         struct commit_list *parents;
 655                         packet_write_fmt(1, "unshallow %s",
 656                                          oid_to_hex(&object->oid));
 657                         object->flags &= ~CLIENT_SHALLOW;
 658                         /*
 659                          * We want to _register_ "object" as shallow, but we
 660                          * also need to traverse object's parents to deepen a
 661                          * shallow clone. Unregister it for now so we can
 662                          * parse and add the parents to the want list, then
 663                          * re-register it.
 664                          */
 665                         unregister_shallow(&object->oid);
 666                         object->parsed = 0;
 667                         parse_commit_or_die((struct commit *)object);
 668                         parents = ((struct commit *)object)->parents;
 669                         while (parents) {
 670                                 add_object_array(&parents->item->object,
 671                                                  NULL, &want_obj);
 672                                 parents = parents->next;
 673                         }
 674                         add_object_array(object, NULL, &extra_edge_obj);
 675                 }
 676                 /* make sure commit traversal conforms to client */
 677                 register_shallow(&object->oid);
 678         }
 679 }
 680
 681 static void deepen(int depth, int deepen_relative,
 682                    struct object_array *shallows)
 683 {
 684         if (depth == INFINITE_DEPTH && !is_repository_shallow()) {
 685                 int i;
 686
 687                 for (i = 0; i < shallows->nr; i++) {
 688                         struct object *object = shallows->objects[i].item;
 689                         object->flags |= NOT_SHALLOW;
 690                 }
 691         } else if (deepen_relative) {
 692                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 693                 struct commit_list *result;
 694
 695                 get_reachable_list(shallows, &reachable_shallows);
 696                 result = get_shallow_commits(&reachable_shallows,
 697                                              depth + 1,
 698                                              SHALLOW, NOT_SHALLOW);
 699                 send_shallow(result);
 700                 free_commit_list(result);
 701                 object_array_clear(&reachable_shallows);
 702         } else {
 703                 struct commit_list *result;
 704
 705                 result = get_shallow_commits(&want_obj, depth,
 706                                              SHALLOW, NOT_SHALLOW);
 707                 send_shallow(result);
 708                 free_commit_list(result);
 709         }
 710
 711         send_unshallow(shallows);
 712         packet_flush(1);
 713 }
 714
 715 static void deepen_by_rev_list(int ac, const char **av,
 716                                struct object_array *shallows)
 717 {
 718         struct commit_list *result;
 719
 720         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 721         send_shallow(result);
 722         free_commit_list(result);
 723         send_unshallow(shallows);
 724         packet_flush(1);
 725 }
 726
 727 static void receive_needs(void)
 728 {
 729         struct object_array shallows = OBJECT_ARRAY_INIT;
 730         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 731         int depth = 0;
 732         int has_non_tip = 0;
 733         timestamp_t deepen_since = 0;
 734         int deepen_rev_list = 0;
 735
 736         shallow_nr = 0;
 737         for (;;) {
 738                 struct object *o;
 739                 const char *features;
 740                 struct object_id oid_buf;
 741                 char *line = packet_read_line(0, NULL);
 742                 const char *arg;
 743
 744                 reset_timeout();
 745                 if (!line)
 746                         break;
 747
 748                 if (skip_prefix(line, "shallow ", &arg)) {
 749                         struct object_id oid;
 750                         struct object *object;
 751                         if (get_oid_hex(arg, &oid))
 752                                 die("invalid shallow line: %s", line);
 753                         object = parse_object(&oid);
 754                         if (!object)
 755                                 continue;
 756                         if (object->type != OBJ_COMMIT)
 757                                 die("invalid shallow object %s", oid_to_hex(&oid));
 758                         if (!(object->flags & CLIENT_SHALLOW)) {
 759                                 object->flags |= CLIENT_SHALLOW;
 760                                 add_object_array(object, NULL, &shallows);
 761                         }
 762                         continue;
 763                 }
 764                 if (skip_prefix(line, "deepen ", &arg)) {
 765                         char *end = NULL;
 766                         depth = strtol(arg, &end, 0);
 767                         if (!end || *end || depth <= 0)
 768                                 die("Invalid deepen: %s", line);
 769                         continue;
 770                 }
 771                 if (skip_prefix(line, "deepen-since ", &arg)) {
 772                         char *end = NULL;
 773                         deepen_since = parse_timestamp(arg, &end, 0);
 774                         if (!end || *end || !deepen_since ||
 775                             /* revisions.c's max_age -1 is special */
 776                             deepen_since == -1)
 777                                 die("Invalid deepen-since: %s", line);
 778                         deepen_rev_list = 1;
 779                         continue;
 780                 }
 781                 if (skip_prefix(line, "deepen-not ", &arg)) {
 782                         char *ref = NULL;
 783                         struct object_id oid;
 784                         if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 785                                 die("git upload-pack: ambiguous deepen-not: %s", line);
 786                         string_list_append(&deepen_not, ref);
 787                         free(ref);
 788                         deepen_rev_list = 1;
 789                         continue;
 790                 }
 791                 if (!skip_prefix(line, "want ", &arg) ||
 792                     get_oid_hex(arg, &oid_buf))
 793                         die("git upload-pack: protocol error, "
 794                             "expected to get sha, not '%s'", line);
 795
 796                 features = arg + 40;
 797
 798                 if (parse_feature_request(features, "deepen-relative"))
 799                         deepen_relative = 1;
 800                 if (parse_feature_request(features, "multi_ack_detailed"))
 801                         multi_ack = 2;
 802                 else if (parse_feature_request(features, "multi_ack"))
 803                         multi_ack = 1;
 804                 if (parse_feature_request(features, "no-done"))
 805                         no_done = 1;
 806                 if (parse_feature_request(features, "thin-pack"))
 807                         use_thin_pack = 1;
 808                 if (parse_feature_request(features, "ofs-delta"))
 809                         use_ofs_delta = 1;
 810                 if (parse_feature_request(features, "side-band-64k"))
 811                         use_sideband = LARGE_PACKET_MAX;
 812                 else if (parse_feature_request(features, "side-band"))
 813                         use_sideband = DEFAULT_PACKET_MAX;
 814                 if (parse_feature_request(features, "no-progress"))
 815                         no_progress = 1;
 816                 if (parse_feature_request(features, "include-tag"))
 817                         use_include_tag = 1;
 818
 819                 o = parse_object(&oid_buf);
 820                 if (!o) {
 821                         packet_write_fmt(1,
 822                                          "ERR upload-pack: not our ref %s",
 823                                          oid_to_hex(&oid_buf));
 824                         die("git upload-pack: not our ref %s",
 825                             oid_to_hex(&oid_buf));
 826                 }
 827                 if (!(o->flags & WANTED)) {
 828                         o->flags |= WANTED;
 829                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 830                               || is_our_ref(o)))
 831                                 has_non_tip = 1;
 832                         add_object_array(o, NULL, &want_obj);
 833                 }
 834         }
 835
 836         /*
 837          * We have sent all our refs already, and the other end
 838          * should have chosen out of them. When we are operating
 839          * in the stateless RPC mode, however, their choice may
 840          * have been based on the set of older refs advertised
 841          * by another process that handled the initial request.
 842          */
 843         if (has_non_tip)
 844                 check_non_tip();
 845
 846         if (!use_sideband && daemon_mode)
 847                 no_progress = 1;
 848
 849         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 850                 return;
 851         if (depth > 0 && deepen_rev_list)
 852                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 853         if (depth > 0)
 854                 deepen(depth, deepen_relative, &shallows);
 855         else if (deepen_rev_list) {
 856                 struct argv_array av = ARGV_ARRAY_INIT;
 857                 int i;
 858
 859                 argv_array_push(&av, "rev-list");
 860                 if (deepen_since)
 861                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 862                 if (deepen_not.nr) {
 863                         argv_array_push(&av, "--not");
 864                         for (i = 0; i < deepen_not.nr; i++) {
 865                                 struct string_list_item *s = deepen_not.items + i;
 866                                 argv_array_push(&av, s->string);
 867                         }
 868                         argv_array_push(&av, "--not");
 869                 }
 870                 for (i = 0; i < want_obj.nr; i++) {
 871                         struct object *o = want_obj.objects[i].item;
 872                         argv_array_push(&av, oid_to_hex(&o->oid));
 873                 }
 874                 deepen_by_rev_list(av.argc, av.argv, &shallows);
 875                 argv_array_clear(&av);
 876         }
 877         else
 878                 if (shallows.nr > 0) {
 879                         int i;
 880                         for (i = 0; i < shallows.nr; i++)
 881                                 register_shallow(&shallows.objects[i].item->oid);
 882                 }
 883
 884         shallow_nr += shallows.nr;
 885         object_array_clear(&shallows);
 886 }
 887
 888 /* return non-zero if the ref is hidden, otherwise 0 */
 889 static int mark_our_ref(const char *refname, const char *refname_full,
 890                         const struct object_id *oid)
 891 {
 892         struct object *o = lookup_unknown_object(oid->hash);
 893
 894         if (ref_is_hidden(refname, refname_full)) {
 895                 o->flags |= HIDDEN_REF;
 896                 return 1;
 897         }
 898         o->flags |= OUR_REF;
 899         return 0;
 900 }
 901
 902 static int check_ref(const char *refname_full, const struct object_id *oid,
 903                      int flag, void *cb_data)
 904 {
 905         const char *refname = strip_namespace(refname_full);
 906
 907         mark_our_ref(refname, refname_full, oid);
 908         return 0;
 909 }
 910
 911 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 912 {
 913         struct string_list_item *item;
 914
 915         if (!symref->nr)
 916                 return;
 917         for_each_string_list_item(item, symref)
 918                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 919 }
 920
 921 static int send_ref(const char *refname, const struct object_id *oid,
 922                     int flag, void *cb_data)
 923 {
 924         static const char *capabilities = "multi_ack thin-pack side-band"
 925                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 926                 " deepen-relative no-progress include-tag multi_ack_detailed";
 927         const char *refname_nons = strip_namespace(refname);
 928         struct object_id peeled;
 929
 930         if (mark_our_ref(refname_nons, refname, oid))
 931                 return 0;
 932
 933         if (capabilities) {
 934                 struct strbuf symref_info = STRBUF_INIT;
 935
 936                 format_symref_info(&symref_info, cb_data);
 937                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s agent=%s\n",
 938                              oid_to_hex(oid), refname_nons,
 939                              0, capabilities,
 940                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 941                                      " allow-tip-sha1-in-want" : "",
 942                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 943                                      " allow-reachable-sha1-in-want" : "",
 944                              stateless_rpc ? " no-done" : "",
 945                              symref_info.buf,
 946                              git_user_agent_sanitized());
 947                 strbuf_release(&symref_info);
 948         } else {
 949                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 950         }
 951         capabilities = NULL;
 952         if (!peel_ref(refname, &peeled))
 953                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 954         return 0;
 955 }
 956
 957 static int find_symref(const char *refname, const struct object_id *oid,
 958                        int flag, void *cb_data)
 959 {
 960         const char *symref_target;
 961         struct string_list_item *item;
 962
 963         if ((flag & REF_ISSYMREF) == 0)
 964                 return 0;
 965         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
 966         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 967                 die("'%s' is a symref but it is not?", refname);
 968         item = string_list_append(cb_data, refname);
 969         item->util = xstrdup(symref_target);
 970         return 0;
 971 }
 972
 973 static int upload_pack_config(const char *var, const char *value, void *unused)
 974 {
 975         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
 976                 if (git_config_bool(var, value))
 977                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
 978                 else
 979                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
 980         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
 981                 if (git_config_bool(var, value))
 982                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
 983                 else
 984                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
 985         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
 986                 if (git_config_bool(var, value))
 987                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
 988                 else
 989                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
 990         } else if (!strcmp("uploadpack.keepalive", var)) {
 991                 keepalive = git_config_int(var, value);
 992                 if (!keepalive)
 993                         keepalive = -1;
 994         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
 995                 if (!strcmp("uploadpack.packobjectshook", var))
 996                         return git_config_string(&pack_objects_hook, var, value);
 997         }
 998         return parse_hide_refs_config(var, value, "uploadpack");
 999 }
1000
1001 void upload_pack(struct upload_pack_options *options)
1002 {
1003         struct string_list symref = STRING_LIST_INIT_DUP;
1004
1005         stateless_rpc = options->stateless_rpc;
1006         timeout = options->timeout;
1007         daemon_mode = options->daemon_mode;
1008
1009         git_config(upload_pack_config, NULL);
1010
1011         head_ref_namespaced(find_symref, &symref);
1012
1013         if (options->advertise_refs || !stateless_rpc) {
1014                 reset_timeout();
1015                 head_ref_namespaced(send_ref, &symref);
1016                 for_each_namespaced_ref(send_ref, &symref);
1017                 advertise_shallow_grafts(1);
1018                 packet_flush(1);
1019         } else {
1020                 head_ref_namespaced(check_ref, NULL);
1021                 for_each_namespaced_ref(check_ref, NULL);
1022         }
1023         string_list_clear(&symref, 1);
1024         if (options->advertise_refs)
1025                 return;
1026
1027         receive_needs();
1028         if (want_obj.nr) {
1029                 get_common_commits();
1030                 create_pack_file();
1031         }
1032 }