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