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