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 "exec_cmd.h"
  10 #include "diff.h"
  11 #include "revision.h"
  12 #include "list-objects.h"
  13 #include "list-objects-filter.h"
  14 #include "list-objects-filter-options.h"
  15 #include "run-command.h"
  16 #include "connect.h"
  17 #include "sigchain.h"
  18 #include "version.h"
  19 #include "string-list.h"
  20 #include "parse-options.h"
  21 #include "argv-array.h"
  22 #include "prio-queue.h"
  23 #include "quote.h"
  24
  25 static const char * const upload_pack_usage[] = {
  26         N_("git upload-pack [<options>] <dir>"),
  27         NULL
  28 };
  29
  30 /* Remember to update object flag allocation in object.h */
  31 #define THEY_HAVE       (1u << 11)
  32 #define OUR_REF         (1u << 12)
  33 #define WANTED          (1u << 13)
  34 #define COMMON_KNOWN    (1u << 14)
  35 #define REACHABLE       (1u << 15)
  36
  37 #define SHALLOW         (1u << 16)
  38 #define NOT_SHALLOW     (1u << 17)
  39 #define CLIENT_SHALLOW  (1u << 18)
  40 #define HIDDEN_REF      (1u << 19)
  41
  42 static timestamp_t oldest_have;
  43
  44 static int deepen_relative;
  45 static int multi_ack;
  46 static int no_done;
  47 static int use_thin_pack, use_ofs_delta, use_include_tag;
  48 static int no_progress, daemon_mode;
  49 /* Allow specifying sha1 if it is a ref tip. */
  50 #define ALLOW_TIP_SHA1  01
  51 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  52 #define ALLOW_REACHABLE_SHA1    02
  53 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  54 #define ALLOW_ANY_SHA1  07
  55 static unsigned int allow_unadvertised_object_request;
  56 static int shallow_nr;
  57 static struct object_array have_obj;
  58 static struct object_array want_obj;
  59 static struct object_array extra_edge_obj;
  60 static unsigned int timeout;
  61 static int keepalive = 5;
  62 /* 0 for no sideband,
  63  * otherwise maximum packet size (up to 65520 bytes).
  64  */
  65 static int use_sideband;
  66 static int advertise_refs;
  67 static int stateless_rpc;
  68 static const char *pack_objects_hook;
  69
  70 static int filter_capability_requested;
  71 static int filter_advertise;
  72 static struct list_objects_filter_options filter_options;
  73
  74 static void reset_timeout(void)
  75 {
  76         alarm(timeout);
  77 }
  78
  79 static void send_client_data(int fd, const char *data, ssize_t sz)
  80 {
  81         if (use_sideband) {
  82                 send_sideband(1, fd, data, sz, use_sideband);
  83                 return;
  84         }
  85         if (fd == 3)
  86                 /* emergency quit */
  87                 fd = 2;
  88         if (fd == 2) {
  89                 /* XXX: are we happy to lose stuff here? */
  90                 xwrite(fd, data, sz);
  91                 return;
  92         }
  93         write_or_die(fd, data, sz);
  94 }
  95
  96 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  97 {
  98         FILE *fp = cb_data;
  99         if (graft->nr_parent == -1)
 100                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 101         return 0;
 102 }
 103
 104 static void create_pack_file(void)
 105 {
 106         struct child_process pack_objects = CHILD_PROCESS_INIT;
 107         char data[8193], progress[128];
 108         char abort_msg[] = "aborting due to possible repository "
 109                 "corruption on the remote side.";
 110         int buffered = -1;
 111         ssize_t sz;
 112         int i;
 113         FILE *pipe_fd;
 114
 115         if (!pack_objects_hook)
 116                 pack_objects.git_cmd = 1;
 117         else {
 118                 argv_array_push(&pack_objects.args, pack_objects_hook);
 119                 argv_array_push(&pack_objects.args, "git");
 120                 pack_objects.use_shell = 1;
 121         }
 122
 123         if (shallow_nr) {
 124                 argv_array_push(&pack_objects.args, "--shallow-file");
 125                 argv_array_push(&pack_objects.args, "");
 126         }
 127         argv_array_push(&pack_objects.args, "pack-objects");
 128         argv_array_push(&pack_objects.args, "--revs");
 129         if (use_thin_pack)
 130                 argv_array_push(&pack_objects.args, "--thin");
 131
 132         argv_array_push(&pack_objects.args, "--stdout");
 133         if (shallow_nr)
 134                 argv_array_push(&pack_objects.args, "--shallow");
 135         if (!no_progress)
 136                 argv_array_push(&pack_objects.args, "--progress");
 137         if (use_ofs_delta)
 138                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 139         if (use_include_tag)
 140                 argv_array_push(&pack_objects.args, "--include-tag");
 141         if (filter_options.filter_spec) {
 142                 struct strbuf buf = STRBUF_INIT;
 143                 sq_quote_buf(&buf, filter_options.filter_spec);
 144                 argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 145                 strbuf_release(&buf);
 146         }
 147
 148         pack_objects.in = -1;
 149         pack_objects.out = -1;
 150         pack_objects.err = -1;
 151
 152         if (start_command(&pack_objects))
 153                 die("git upload-pack: unable to fork git-pack-objects");
 154
 155         pipe_fd = xfdopen(pack_objects.in, "w");
 156
 157         if (shallow_nr)
 158                 for_each_commit_graft(write_one_shallow, pipe_fd);
 159
 160         for (i = 0; i < want_obj.nr; i++)
 161                 fprintf(pipe_fd, "%s\n",
 162                         oid_to_hex(&want_obj.objects[i].item->oid));
 163         fprintf(pipe_fd, "--not\n");
 164         for (i = 0; i < have_obj.nr; i++)
 165                 fprintf(pipe_fd, "%s\n",
 166                         oid_to_hex(&have_obj.objects[i].item->oid));
 167         for (i = 0; i < extra_edge_obj.nr; i++)
 168                 fprintf(pipe_fd, "%s\n",
 169                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 170         fprintf(pipe_fd, "\n");
 171         fflush(pipe_fd);
 172         fclose(pipe_fd);
 173
 174         /* We read from pack_objects.err to capture stderr output for
 175          * progress bar, and pack_objects.out to capture the pack data.
 176          */
 177
 178         while (1) {
 179                 struct pollfd pfd[2];
 180                 int pe, pu, pollsize;
 181                 int ret;
 182
 183                 reset_timeout();
 184
 185                 pollsize = 0;
 186                 pe = pu = -1;
 187
 188                 if (0 <= pack_objects.out) {
 189                         pfd[pollsize].fd = pack_objects.out;
 190                         pfd[pollsize].events = POLLIN;
 191                         pu = pollsize;
 192                         pollsize++;
 193                 }
 194                 if (0 <= pack_objects.err) {
 195                         pfd[pollsize].fd = pack_objects.err;
 196                         pfd[pollsize].events = POLLIN;
 197                         pe = pollsize;
 198                         pollsize++;
 199                 }
 200
 201                 if (!pollsize)
 202                         break;
 203
 204                 ret = poll(pfd, pollsize,
 205                         keepalive < 0 ? -1 : 1000 * keepalive);
 206
 207                 if (ret < 0) {
 208                         if (errno != EINTR) {
 209                                 error_errno("poll failed, resuming");
 210                                 sleep(1);
 211                         }
 212                         continue;
 213                 }
 214                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 215                         /* Status ready; we ship that in the side-band
 216                          * or dump to the standard error.
 217                          */
 218                         sz = xread(pack_objects.err, progress,
 219                                   sizeof(progress));
 220                         if (0 < sz)
 221                                 send_client_data(2, progress, sz);
 222                         else if (sz == 0) {
 223                                 close(pack_objects.err);
 224                                 pack_objects.err = -1;
 225                         }
 226                         else
 227                                 goto fail;
 228                         /* give priority to status messages */
 229                         continue;
 230                 }
 231                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 232                         /* Data ready; we keep the last byte to ourselves
 233                          * in case we detect broken rev-list, so that we
 234                          * can leave the stream corrupted.  This is
 235                          * unfortunate -- unpack-objects would happily
 236                          * accept a valid packdata with trailing garbage,
 237                          * so appending garbage after we pass all the
 238                          * pack data is not good enough to signal
 239                          * breakage to downstream.
 240                          */
 241                         char *cp = data;
 242                         ssize_t outsz = 0;
 243                         if (0 <= buffered) {
 244                                 *cp++ = buffered;
 245                                 outsz++;
 246                         }
 247                         sz = xread(pack_objects.out, cp,
 248                                   sizeof(data) - outsz);
 249                         if (0 < sz)
 250                                 ;
 251                         else if (sz == 0) {
 252                                 close(pack_objects.out);
 253                                 pack_objects.out = -1;
 254                         }
 255                         else
 256                                 goto fail;
 257                         sz += outsz;
 258                         if (1 < sz) {
 259                                 buffered = data[sz-1] & 0xFF;
 260                                 sz--;
 261                         }
 262                         else
 263                                 buffered = -1;
 264                         send_client_data(1, data, sz);
 265                 }
 266
 267                 /*
 268                  * We hit the keepalive timeout without saying anything; send
 269                  * an empty message on the data sideband just to let the other
 270                  * side know we're still working on it, but don't have any data
 271                  * yet.
 272                  *
 273                  * If we don't have a sideband channel, there's no room in the
 274                  * protocol to say anything, so those clients are just out of
 275                  * luck.
 276                  */
 277                 if (!ret && use_sideband) {
 278                         static const char buf[] = "0005\1";
 279                         write_or_die(1, buf, 5);
 280                 }
 281         }
 282
 283         if (finish_command(&pack_objects)) {
 284                 error("git upload-pack: git-pack-objects died with error.");
 285                 goto fail;
 286         }
 287
 288         /* flush the data */
 289         if (0 <= buffered) {
 290                 data[0] = buffered;
 291                 send_client_data(1, data, 1);
 292                 fprintf(stderr, "flushed.\n");
 293         }
 294         if (use_sideband)
 295                 packet_flush(1);
 296         return;
 297
 298  fail:
 299         send_client_data(3, abort_msg, sizeof(abort_msg));
 300         die("git upload-pack: %s", abort_msg);
 301 }
 302
 303 static int got_oid(const char *hex, struct object_id *oid)
 304 {
 305         struct object *o;
 306         int we_knew_they_have = 0;
 307
 308         if (get_oid_hex(hex, oid))
 309                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 310         if (!has_object_file(oid))
 311                 return -1;
 312
 313         o = parse_object(oid);
 314         if (!o)
 315                 die("oops (%s)", oid_to_hex(oid));
 316         if (o->type == OBJ_COMMIT) {
 317                 struct commit_list *parents;
 318                 struct commit *commit = (struct commit *)o;
 319                 if (o->flags & THEY_HAVE)
 320                         we_knew_they_have = 1;
 321                 else
 322                         o->flags |= THEY_HAVE;
 323                 if (!oldest_have || (commit->date < oldest_have))
 324                         oldest_have = commit->date;
 325                 for (parents = commit->parents;
 326                      parents;
 327                      parents = parents->next)
 328                         parents->item->object.flags |= THEY_HAVE;
 329         }
 330         if (!we_knew_they_have) {
 331                 add_object_array(o, NULL, &have_obj);
 332                 return 1;
 333         }
 334         return 0;
 335 }
 336
 337 static int reachable(struct commit *want)
 338 {
 339         struct prio_queue work = { compare_commits_by_commit_date };
 340
 341         prio_queue_put(&work, want);
 342         while (work.nr) {
 343                 struct commit_list *list;
 344                 struct commit *commit = prio_queue_get(&work);
 345
 346                 if (commit->object.flags & THEY_HAVE) {
 347                         want->object.flags |= COMMON_KNOWN;
 348                         break;
 349                 }
 350                 if (!commit->object.parsed)
 351                         parse_object(&commit->object.oid);
 352                 if (commit->object.flags & REACHABLE)
 353                         continue;
 354                 commit->object.flags |= REACHABLE;
 355                 if (commit->date < oldest_have)
 356                         continue;
 357                 for (list = commit->parents; list; list = list->next) {
 358                         struct commit *parent = list->item;
 359                         if (!(parent->object.flags & REACHABLE))
 360                                 prio_queue_put(&work, parent);
 361                 }
 362         }
 363         want->object.flags |= REACHABLE;
 364         clear_commit_marks(want, REACHABLE);
 365         clear_prio_queue(&work);
 366         return (want->object.flags & COMMON_KNOWN);
 367 }
 368
 369 static int ok_to_give_up(void)
 370 {
 371         int i;
 372
 373         if (!have_obj.nr)
 374                 return 0;
 375
 376         for (i = 0; i < want_obj.nr; i++) {
 377                 struct object *want = want_obj.objects[i].item;
 378
 379                 if (want->flags & COMMON_KNOWN)
 380                         continue;
 381                 want = deref_tag(want, "a want line", 0);
 382                 if (!want || want->type != OBJ_COMMIT) {
 383                         /* no way to tell if this is reachable by
 384                          * looking at the ancestry chain alone, so
 385                          * leave a note to ourselves not to worry about
 386                          * this object anymore.
 387                          */
 388                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 389                         continue;
 390                 }
 391                 if (!reachable((struct commit *)want))
 392                         return 0;
 393         }
 394         return 1;
 395 }
 396
 397 static int get_common_commits(void)
 398 {
 399         struct object_id oid;
 400         char last_hex[GIT_MAX_HEXSZ + 1];
 401         int got_common = 0;
 402         int got_other = 0;
 403         int sent_ready = 0;
 404
 405         save_commit_buffer = 0;
 406
 407         for (;;) {
 408                 char *line = packet_read_line(0, NULL);
 409                 const char *arg;
 410
 411                 reset_timeout();
 412
 413                 if (!line) {
 414                         if (multi_ack == 2 && got_common
 415                             && !got_other && ok_to_give_up()) {
 416                                 sent_ready = 1;
 417                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 418                         }
 419                         if (have_obj.nr == 0 || multi_ack)
 420                                 packet_write_fmt(1, "NAK\n");
 421
 422                         if (no_done && sent_ready) {
 423                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 424                                 return 0;
 425                         }
 426                         if (stateless_rpc)
 427                                 exit(0);
 428                         got_common = 0;
 429                         got_other = 0;
 430                         continue;
 431                 }
 432                 if (skip_prefix(line, "have ", &arg)) {
 433                         switch (got_oid(arg, &oid)) {
 434                         case -1: /* they have what we do not */
 435                                 got_other = 1;
 436                                 if (multi_ack && ok_to_give_up()) {
 437                                         const char *hex = oid_to_hex(&oid);
 438                                         if (multi_ack == 2) {
 439                                                 sent_ready = 1;
 440                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 441                                         } else
 442                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 443                                 }
 444                                 break;
 445                         default:
 446                                 got_common = 1;
 447                                 memcpy(last_hex, oid_to_hex(&oid), 41);
 448                                 if (multi_ack == 2)
 449                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 450                                 else if (multi_ack)
 451                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 452                                 else if (have_obj.nr == 1)
 453                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 454                                 break;
 455                         }
 456                         continue;
 457                 }
 458                 if (!strcmp(line, "done")) {
 459                         if (have_obj.nr > 0) {
 460                                 if (multi_ack)
 461                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 462                                 return 0;
 463                         }
 464                         packet_write_fmt(1, "NAK\n");
 465                         return -1;
 466                 }
 467                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 468         }
 469 }
 470
 471 static int is_our_ref(struct object *o)
 472 {
 473         int allow_hidden_ref = (allow_unadvertised_object_request &
 474                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 475         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 476 }
 477
 478 /*
 479  * on successful case, it's up to the caller to close cmd->out
 480  */
 481 static int do_reachable_revlist(struct child_process *cmd,
 482                                 struct object_array *src,
 483                                 struct object_array *reachable)
 484 {
 485         static const char *argv[] = {
 486                 "rev-list", "--stdin", NULL,
 487         };
 488         struct object *o;
 489         char namebuf[42]; /* ^ + SHA-1 + LF */
 490         int i;
 491
 492         cmd->argv = argv;
 493         cmd->git_cmd = 1;
 494         cmd->no_stderr = 1;
 495         cmd->in = -1;
 496         cmd->out = -1;
 497
 498         /*
 499          * If the next rev-list --stdin encounters an unknown commit,
 500          * it terminates, which will cause SIGPIPE in the write loop
 501          * below.
 502          */
 503         sigchain_push(SIGPIPE, SIG_IGN);
 504
 505         if (start_command(cmd))
 506                 goto error;
 507
 508         namebuf[0] = '^';
 509         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 510         for (i = get_max_object_index(); 0 < i; ) {
 511                 o = get_indexed_object(--i);
 512                 if (!o)
 513                         continue;
 514                 if (reachable && o->type == OBJ_COMMIT)
 515                         o->flags &= ~TMP_MARK;
 516                 if (!is_our_ref(o))
 517                         continue;
 518                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 519                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 520                         goto error;
 521         }
 522         namebuf[GIT_SHA1_HEXSZ] = '\n';
 523         for (i = 0; i < src->nr; i++) {
 524                 o = src->objects[i].item;
 525                 if (is_our_ref(o)) {
 526                         if (reachable)
 527                                 add_object_array(o, NULL, reachable);
 528                         continue;
 529                 }
 530                 if (reachable && o->type == OBJ_COMMIT)
 531                         o->flags |= TMP_MARK;
 532                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 533                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 534                         goto error;
 535         }
 536         close(cmd->in);
 537         cmd->in = -1;
 538         sigchain_pop(SIGPIPE);
 539
 540         return 0;
 541
 542 error:
 543         sigchain_pop(SIGPIPE);
 544
 545         if (cmd->in >= 0)
 546                 close(cmd->in);
 547         if (cmd->out >= 0)
 548                 close(cmd->out);
 549         return -1;
 550 }
 551
 552 static int get_reachable_list(struct object_array *src,
 553                               struct object_array *reachable)
 554 {
 555         struct child_process cmd = CHILD_PROCESS_INIT;
 556         int i;
 557         struct object *o;
 558         char namebuf[42]; /* ^ + SHA-1 + LF */
 559
 560         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 561                 return -1;
 562
 563         while ((i = read_in_full(cmd.out, namebuf, 41)) == 41) {
 564                 struct object_id sha1;
 565
 566                 if (namebuf[40] != '\n' || get_oid_hex(namebuf, &sha1))
 567                         break;
 568
 569                 o = lookup_object(sha1.hash);
 570                 if (o && o->type == OBJ_COMMIT) {
 571                         o->flags &= ~TMP_MARK;
 572                 }
 573         }
 574         for (i = get_max_object_index(); 0 < i; i--) {
 575                 o = get_indexed_object(i - 1);
 576                 if (o && o->type == OBJ_COMMIT &&
 577                     (o->flags & TMP_MARK)) {
 578                         add_object_array(o, NULL, reachable);
 579                                 o->flags &= ~TMP_MARK;
 580                 }
 581         }
 582         close(cmd.out);
 583
 584         if (finish_command(&cmd))
 585                 return -1;
 586
 587         return 0;
 588 }
 589
 590 static int has_unreachable(struct object_array *src)
 591 {
 592         struct child_process cmd = CHILD_PROCESS_INIT;
 593         char buf[1];
 594         int i;
 595
 596         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 597                 return 1;
 598
 599         /*
 600          * The commits out of the rev-list are not ancestors of
 601          * our ref.
 602          */
 603         i = read_in_full(cmd.out, buf, 1);
 604         if (i)
 605                 goto error;
 606         close(cmd.out);
 607         cmd.out = -1;
 608
 609         /*
 610          * rev-list may have died by encountering a bad commit
 611          * in the history, in which case we do want to bail out
 612          * even when it showed no commit.
 613          */
 614         if (finish_command(&cmd))
 615                 goto error;
 616
 617         /* All the non-tip ones are ancestors of what we advertised */
 618         return 0;
 619
 620 error:
 621         sigchain_pop(SIGPIPE);
 622         if (cmd.out >= 0)
 623                 close(cmd.out);
 624         return 1;
 625 }
 626
 627 static void check_non_tip(void)
 628 {
 629         int i;
 630
 631         /*
 632          * In the normal in-process case without
 633          * uploadpack.allowReachableSHA1InWant,
 634          * non-tip requests can never happen.
 635          */
 636         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 637                 goto error;
 638         if (!has_unreachable(&want_obj))
 639                 /* All the non-tip ones are ancestors of what we advertised */
 640                 return;
 641
 642 error:
 643         /* Pick one of them (we know there at least is one) */
 644         for (i = 0; i < want_obj.nr; i++) {
 645                 struct object *o = want_obj.objects[i].item;
 646                 if (!is_our_ref(o))
 647                         die("git upload-pack: not our ref %s",
 648                             oid_to_hex(&o->oid));
 649         }
 650 }
 651
 652 static void send_shallow(struct commit_list *result)
 653 {
 654         while (result) {
 655                 struct object *object = &result->item->object;
 656                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 657                         packet_write_fmt(1, "shallow %s",
 658                                          oid_to_hex(&object->oid));
 659                         register_shallow(&object->oid);
 660                         shallow_nr++;
 661                 }
 662                 result = result->next;
 663         }
 664 }
 665
 666 static void send_unshallow(const struct object_array *shallows)
 667 {
 668         int i;
 669
 670         for (i = 0; i < shallows->nr; i++) {
 671                 struct object *object = shallows->objects[i].item;
 672                 if (object->flags & NOT_SHALLOW) {
 673                         struct commit_list *parents;
 674                         packet_write_fmt(1, "unshallow %s",
 675                                          oid_to_hex(&object->oid));
 676                         object->flags &= ~CLIENT_SHALLOW;
 677                         /*
 678                          * We want to _register_ "object" as shallow, but we
 679                          * also need to traverse object's parents to deepen a
 680                          * shallow clone. Unregister it for now so we can
 681                          * parse and add the parents to the want list, then
 682                          * re-register it.
 683                          */
 684                         unregister_shallow(&object->oid);
 685                         object->parsed = 0;
 686                         parse_commit_or_die((struct commit *)object);
 687                         parents = ((struct commit *)object)->parents;
 688                         while (parents) {
 689                                 add_object_array(&parents->item->object,
 690                                                  NULL, &want_obj);
 691                                 parents = parents->next;
 692                         }
 693                         add_object_array(object, NULL, &extra_edge_obj);
 694                 }
 695                 /* make sure commit traversal conforms to client */
 696                 register_shallow(&object->oid);
 697         }
 698 }
 699
 700 static void deepen(int depth, int deepen_relative,
 701                    struct object_array *shallows)
 702 {
 703         if (depth == INFINITE_DEPTH && !is_repository_shallow()) {
 704                 int i;
 705
 706                 for (i = 0; i < shallows->nr; i++) {
 707                         struct object *object = shallows->objects[i].item;
 708                         object->flags |= NOT_SHALLOW;
 709                 }
 710         } else if (deepen_relative) {
 711                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 712                 struct commit_list *result;
 713
 714                 get_reachable_list(shallows, &reachable_shallows);
 715                 result = get_shallow_commits(&reachable_shallows,
 716                                              depth + 1,
 717                                              SHALLOW, NOT_SHALLOW);
 718                 send_shallow(result);
 719                 free_commit_list(result);
 720                 object_array_clear(&reachable_shallows);
 721         } else {
 722                 struct commit_list *result;
 723
 724                 result = get_shallow_commits(&want_obj, depth,
 725                                              SHALLOW, NOT_SHALLOW);
 726                 send_shallow(result);
 727                 free_commit_list(result);
 728         }
 729
 730         send_unshallow(shallows);
 731         packet_flush(1);
 732 }
 733
 734 static void deepen_by_rev_list(int ac, const char **av,
 735                                struct object_array *shallows)
 736 {
 737         struct commit_list *result;
 738
 739         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 740         send_shallow(result);
 741         free_commit_list(result);
 742         send_unshallow(shallows);
 743         packet_flush(1);
 744 }
 745
 746 static void receive_needs(void)
 747 {
 748         struct object_array shallows = OBJECT_ARRAY_INIT;
 749         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 750         int depth = 0;
 751         int has_non_tip = 0;
 752         timestamp_t deepen_since = 0;
 753         int deepen_rev_list = 0;
 754
 755         shallow_nr = 0;
 756         for (;;) {
 757                 struct object *o;
 758                 const char *features;
 759                 struct object_id oid_buf;
 760                 char *line = packet_read_line(0, NULL);
 761                 const char *arg;
 762
 763                 reset_timeout();
 764                 if (!line)
 765                         break;
 766
 767                 if (skip_prefix(line, "shallow ", &arg)) {
 768                         struct object_id oid;
 769                         struct object *object;
 770                         if (get_oid_hex(arg, &oid))
 771                                 die("invalid shallow line: %s", line);
 772                         object = parse_object(&oid);
 773                         if (!object)
 774                                 continue;
 775                         if (object->type != OBJ_COMMIT)
 776                                 die("invalid shallow object %s", oid_to_hex(&oid));
 777                         if (!(object->flags & CLIENT_SHALLOW)) {
 778                                 object->flags |= CLIENT_SHALLOW;
 779                                 add_object_array(object, NULL, &shallows);
 780                         }
 781                         continue;
 782                 }
 783                 if (skip_prefix(line, "deepen ", &arg)) {
 784                         char *end = NULL;
 785                         depth = strtol(arg, &end, 0);
 786                         if (!end || *end || depth <= 0)
 787                                 die("Invalid deepen: %s", line);
 788                         continue;
 789                 }
 790                 if (skip_prefix(line, "deepen-since ", &arg)) {
 791                         char *end = NULL;
 792                         deepen_since = parse_timestamp(arg, &end, 0);
 793                         if (!end || *end || !deepen_since ||
 794                             /* revisions.c's max_age -1 is special */
 795                             deepen_since == -1)
 796                                 die("Invalid deepen-since: %s", line);
 797                         deepen_rev_list = 1;
 798                         continue;
 799                 }
 800                 if (skip_prefix(line, "deepen-not ", &arg)) {
 801                         char *ref = NULL;
 802                         struct object_id oid;
 803                         if (expand_ref(arg, strlen(arg), oid.hash, &ref) != 1)
 804                                 die("git upload-pack: ambiguous deepen-not: %s", line);
 805                         string_list_append(&deepen_not, ref);
 806                         free(ref);
 807                         deepen_rev_list = 1;
 808                         continue;
 809                 }
 810                 if (skip_prefix(line, "filter ", &arg)) {
 811                         if (!filter_capability_requested)
 812                                 die("git upload-pack: filtering capability not negotiated");
 813                         parse_list_objects_filter(&filter_options, arg);
 814                         continue;
 815                 }
 816                 if (!skip_prefix(line, "want ", &arg) ||
 817                     get_oid_hex(arg, &oid_buf))
 818                         die("git upload-pack: protocol error, "
 819                             "expected to get sha, not '%s'", line);
 820
 821                 features = arg + 40;
 822
 823                 if (parse_feature_request(features, "deepen-relative"))
 824                         deepen_relative = 1;
 825                 if (parse_feature_request(features, "multi_ack_detailed"))
 826                         multi_ack = 2;
 827                 else if (parse_feature_request(features, "multi_ack"))
 828                         multi_ack = 1;
 829                 if (parse_feature_request(features, "no-done"))
 830                         no_done = 1;
 831                 if (parse_feature_request(features, "thin-pack"))
 832                         use_thin_pack = 1;
 833                 if (parse_feature_request(features, "ofs-delta"))
 834                         use_ofs_delta = 1;
 835                 if (parse_feature_request(features, "side-band-64k"))
 836                         use_sideband = LARGE_PACKET_MAX;
 837                 else if (parse_feature_request(features, "side-band"))
 838                         use_sideband = DEFAULT_PACKET_MAX;
 839                 if (parse_feature_request(features, "no-progress"))
 840                         no_progress = 1;
 841                 if (parse_feature_request(features, "include-tag"))
 842                         use_include_tag = 1;
 843                 if (parse_feature_request(features, "filter"))
 844                         filter_capability_requested = 1;
 845
 846                 o = parse_object(&oid_buf);
 847                 if (!o) {
 848                         packet_write_fmt(1,
 849                                          "ERR upload-pack: not our ref %s",
 850                                          oid_to_hex(&oid_buf));
 851                         die("git upload-pack: not our ref %s",
 852                             oid_to_hex(&oid_buf));
 853                 }
 854                 if (!(o->flags & WANTED)) {
 855                         o->flags |= WANTED;
 856                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 857                               || is_our_ref(o)))
 858                                 has_non_tip = 1;
 859                         add_object_array(o, NULL, &want_obj);
 860                 }
 861         }
 862
 863         /*
 864          * We have sent all our refs already, and the other end
 865          * should have chosen out of them. When we are operating
 866          * in the stateless RPC mode, however, their choice may
 867          * have been based on the set of older refs advertised
 868          * by another process that handled the initial request.
 869          */
 870         if (has_non_tip)
 871                 check_non_tip();
 872
 873         if (!use_sideband && daemon_mode)
 874                 no_progress = 1;
 875
 876         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 877                 return;
 878         if (depth > 0 && deepen_rev_list)
 879                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 880         if (depth > 0)
 881                 deepen(depth, deepen_relative, &shallows);
 882         else if (deepen_rev_list) {
 883                 struct argv_array av = ARGV_ARRAY_INIT;
 884                 int i;
 885
 886                 argv_array_push(&av, "rev-list");
 887                 if (deepen_since)
 888                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 889                 if (deepen_not.nr) {
 890                         argv_array_push(&av, "--not");
 891                         for (i = 0; i < deepen_not.nr; i++) {
 892                                 struct string_list_item *s = deepen_not.items + i;
 893                                 argv_array_push(&av, s->string);
 894                         }
 895                         argv_array_push(&av, "--not");
 896                 }
 897                 for (i = 0; i < want_obj.nr; i++) {
 898                         struct object *o = want_obj.objects[i].item;
 899                         argv_array_push(&av, oid_to_hex(&o->oid));
 900                 }
 901                 deepen_by_rev_list(av.argc, av.argv, &shallows);
 902                 argv_array_clear(&av);
 903         }
 904         else
 905                 if (shallows.nr > 0) {
 906                         int i;
 907                         for (i = 0; i < shallows.nr; i++)
 908                                 register_shallow(&shallows.objects[i].item->oid);
 909                 }
 910
 911         shallow_nr += shallows.nr;
 912         object_array_clear(&shallows);
 913 }
 914
 915 /* return non-zero if the ref is hidden, otherwise 0 */
 916 static int mark_our_ref(const char *refname, const char *refname_full,
 917                         const struct object_id *oid)
 918 {
 919         struct object *o = lookup_unknown_object(oid->hash);
 920
 921         if (ref_is_hidden(refname, refname_full)) {
 922                 o->flags |= HIDDEN_REF;
 923                 return 1;
 924         }
 925         o->flags |= OUR_REF;
 926         return 0;
 927 }
 928
 929 static int check_ref(const char *refname_full, const struct object_id *oid,
 930                      int flag, void *cb_data)
 931 {
 932         const char *refname = strip_namespace(refname_full);
 933
 934         mark_our_ref(refname, refname_full, oid);
 935         return 0;
 936 }
 937
 938 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 939 {
 940         struct string_list_item *item;
 941
 942         if (!symref->nr)
 943                 return;
 944         for_each_string_list_item(item, symref)
 945                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 946 }
 947
 948 static int send_ref(const char *refname, const struct object_id *oid,
 949                     int flag, void *cb_data)
 950 {
 951         static const char *capabilities = "multi_ack thin-pack side-band"
 952                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 953                 " deepen-relative no-progress include-tag multi_ack_detailed";
 954         const char *refname_nons = strip_namespace(refname);
 955         struct object_id peeled;
 956
 957         if (mark_our_ref(refname_nons, refname, oid))
 958                 return 0;
 959
 960         if (capabilities) {
 961                 struct strbuf symref_info = STRBUF_INIT;
 962
 963                 format_symref_info(&symref_info, cb_data);
 964                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
 965                              oid_to_hex(oid), refname_nons,
 966                              0, capabilities,
 967                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 968                                      " allow-tip-sha1-in-want" : "",
 969                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 970                                      " allow-reachable-sha1-in-want" : "",
 971                              stateless_rpc ? " no-done" : "",
 972                              symref_info.buf,
 973                              filter_advertise ? " filter" : "",
 974                              git_user_agent_sanitized());
 975                 strbuf_release(&symref_info);
 976         } else {
 977                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 978         }
 979         capabilities = NULL;
 980         if (!peel_ref(refname, peeled.hash))
 981                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 982         return 0;
 983 }
 984
 985 static int find_symref(const char *refname, const struct object_id *oid,
 986                        int flag, void *cb_data)
 987 {
 988         const char *symref_target;
 989         struct string_list_item *item;
 990
 991         if ((flag & REF_ISSYMREF) == 0)
 992                 return 0;
 993         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
 994         if (!symref_target || (flag & REF_ISSYMREF) == 0)
 995                 die("'%s' is a symref but it is not?", refname);
 996         item = string_list_append(cb_data, refname);
 997         item->util = xstrdup(symref_target);
 998         return 0;
 999 }
1000
1001 static void upload_pack(void)
1002 {
1003         struct string_list symref = STRING_LIST_INIT_DUP;
1004
1005         head_ref_namespaced(find_symref, &symref);
1006
1007         if (advertise_refs || !stateless_rpc) {
1008                 reset_timeout();
1009                 head_ref_namespaced(send_ref, &symref);
1010                 for_each_namespaced_ref(send_ref, &symref);
1011                 advertise_shallow_grafts(1);
1012                 packet_flush(1);
1013         } else {
1014                 head_ref_namespaced(check_ref, NULL);
1015                 for_each_namespaced_ref(check_ref, NULL);
1016         }
1017         string_list_clear(&symref, 1);
1018         if (advertise_refs)
1019                 return;
1020
1021         receive_needs();
1022         if (want_obj.nr) {
1023                 get_common_commits();
1024                 create_pack_file();
1025         }
1026 }
1027
1028 static int upload_pack_config(const char *var, const char *value, void *unused)
1029 {
1030         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1031                 if (git_config_bool(var, value))
1032                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1033                 else
1034                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1035         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1036                 if (git_config_bool(var, value))
1037                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1038                 else
1039                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1040         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1041                 if (git_config_bool(var, value))
1042                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1043                 else
1044                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1045         } else if (!strcmp("uploadpack.keepalive", var)) {
1046                 keepalive = git_config_int(var, value);
1047                 if (!keepalive)
1048                         keepalive = -1;
1049         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1050                 if (!strcmp("uploadpack.packobjectshook", var))
1051                         return git_config_string(&pack_objects_hook, var, value);
1052         } else if (!strcmp("uploadpack.allowfilter", var)) {
1053                 filter_advertise = git_config_bool(var, value);
1054         }
1055         return parse_hide_refs_config(var, value, "uploadpack");
1056 }
1057
1058 int cmd_main(int argc, const char **argv)
1059 {
1060         const char *dir;
1061         int strict = 0;
1062         struct option options[] = {
1063                 OPT_BOOL(0, "stateless-rpc", &stateless_rpc,
1064                          N_("quit after a single request/response exchange")),
1065                 OPT_BOOL(0, "advertise-refs", &advertise_refs,
1066                          N_("exit immediately after initial ref advertisement")),
1067                 OPT_BOOL(0, "strict", &strict,
1068                          N_("do not try <directory>/.git/ if <directory> is no Git directory")),
1069                 OPT_INTEGER(0, "timeout", &timeout,
1070                             N_("interrupt transfer after <n> seconds of inactivity")),
1071                 OPT_END()
1072         };
1073
1074         packet_trace_identity("upload-pack");
1075         check_replace_refs = 0;
1076
1077         argc = parse_options(argc, argv, NULL, options, upload_pack_usage, 0);
1078
1079         if (argc != 1)
1080                 usage_with_options(upload_pack_usage, options);
1081
1082         if (timeout)
1083                 daemon_mode = 1;
1084
1085         setup_path();
1086
1087         dir = argv[0];
1088
1089         if (!enter_repo(dir, strict))
1090                 die("'%s' does not appear to be a git repository", dir);
1091
1092         git_config(upload_pack_config, NULL);
1093         upload_pack();
1094         return 0;
1095 }