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 "protocol.h"
  24 #include "quote.h"
  25
  26 static const char * const upload_pack_usage[] = {
  27         N_("git upload-pack [<options>] <dir>"),
  28         NULL
  29 };
  30
  31 /* Remember to update object flag allocation in object.h */
  32 #define THEY_HAVE       (1u << 11)
  33 #define OUR_REF         (1u << 12)
  34 #define WANTED          (1u << 13)
  35 #define COMMON_KNOWN    (1u << 14)
  36 #define REACHABLE       (1u << 15)
  37
  38 #define SHALLOW         (1u << 16)
  39 #define NOT_SHALLOW     (1u << 17)
  40 #define CLIENT_SHALLOW  (1u << 18)
  41 #define HIDDEN_REF      (1u << 19)
  42
  43 static timestamp_t oldest_have;
  44
  45 static int deepen_relative;
  46 static int multi_ack;
  47 static int no_done;
  48 static int use_thin_pack, use_ofs_delta, use_include_tag;
  49 static int no_progress, daemon_mode;
  50 /* Allow specifying sha1 if it is a ref tip. */
  51 #define ALLOW_TIP_SHA1  01
  52 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  53 #define ALLOW_REACHABLE_SHA1    02
  54 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  55 #define ALLOW_ANY_SHA1  07
  56 static unsigned int allow_unadvertised_object_request;
  57 static int shallow_nr;
  58 static struct object_array have_obj;
  59 static struct object_array want_obj;
  60 static struct object_array extra_edge_obj;
  61 static unsigned int timeout;
  62 static int keepalive = 5;
  63 /* 0 for no sideband,
  64  * otherwise maximum packet size (up to 65520 bytes).
  65  */
  66 static int use_sideband;
  67 static int advertise_refs;
  68 static int stateless_rpc;
  69 static const char *pack_objects_hook;
  70
  71 static int filter_capability_requested;
  72 static int allow_filter;
  73 static struct list_objects_filter_options filter_options;
  74
  75 static void reset_timeout(void)
  76 {
  77         alarm(timeout);
  78 }
  79
  80 static void send_client_data(int fd, const char *data, ssize_t sz)
  81 {
  82         if (use_sideband) {
  83                 send_sideband(1, fd, data, sz, use_sideband);
  84                 return;
  85         }
  86         if (fd == 3)
  87                 /* emergency quit */
  88                 fd = 2;
  89         if (fd == 2) {
  90                 /* XXX: are we happy to lose stuff here? */
  91                 xwrite(fd, data, sz);
  92                 return;
  93         }
  94         write_or_die(fd, data, sz);
  95 }
  96
  97 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  98 {
  99         FILE *fp = cb_data;
 100         if (graft->nr_parent == -1)
 101                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 102         return 0;
 103 }
 104
 105 static void create_pack_file(void)
 106 {
 107         struct child_process pack_objects = CHILD_PROCESS_INIT;
 108         char data[8193], progress[128];
 109         char abort_msg[] = "aborting due to possible repository "
 110                 "corruption on the remote side.";
 111         int buffered = -1;
 112         ssize_t sz;
 113         int i;
 114         FILE *pipe_fd;
 115
 116         if (!pack_objects_hook)
 117                 pack_objects.git_cmd = 1;
 118         else {
 119                 argv_array_push(&pack_objects.args, pack_objects_hook);
 120                 argv_array_push(&pack_objects.args, "git");
 121                 pack_objects.use_shell = 1;
 122         }
 123
 124         if (shallow_nr) {
 125                 argv_array_push(&pack_objects.args, "--shallow-file");
 126                 argv_array_push(&pack_objects.args, "");
 127         }
 128         argv_array_push(&pack_objects.args, "pack-objects");
 129         argv_array_push(&pack_objects.args, "--revs");
 130         if (use_thin_pack)
 131                 argv_array_push(&pack_objects.args, "--thin");
 132
 133         argv_array_push(&pack_objects.args, "--stdout");
 134         if (shallow_nr)
 135                 argv_array_push(&pack_objects.args, "--shallow");
 136         if (!no_progress)
 137                 argv_array_push(&pack_objects.args, "--progress");
 138         if (use_ofs_delta)
 139                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 140         if (use_include_tag)
 141                 argv_array_push(&pack_objects.args, "--include-tag");
 142         if (filter_options.filter_spec) {
 143                 if (pack_objects.use_shell) {
 144                         struct strbuf buf = STRBUF_INIT;
 145                         sq_quote_buf(&buf, filter_options.filter_spec);
 146                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 147                         strbuf_release(&buf);
 148                 } else {
 149                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 150                                          filter_options.filter_spec);
 151                 }
 152         }
 153
 154         pack_objects.in = -1;
 155         pack_objects.out = -1;
 156         pack_objects.err = -1;
 157
 158         if (start_command(&pack_objects))
 159                 die("git upload-pack: unable to fork git-pack-objects");
 160
 161         pipe_fd = xfdopen(pack_objects.in, "w");
 162
 163         if (shallow_nr)
 164                 for_each_commit_graft(write_one_shallow, pipe_fd);
 165
 166         for (i = 0; i < want_obj.nr; i++)
 167                 fprintf(pipe_fd, "%s\n",
 168                         oid_to_hex(&want_obj.objects[i].item->oid));
 169         fprintf(pipe_fd, "--not\n");
 170         for (i = 0; i < have_obj.nr; i++)
 171                 fprintf(pipe_fd, "%s\n",
 172                         oid_to_hex(&have_obj.objects[i].item->oid));
 173         for (i = 0; i < extra_edge_obj.nr; i++)
 174                 fprintf(pipe_fd, "%s\n",
 175                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 176         fprintf(pipe_fd, "\n");
 177         fflush(pipe_fd);
 178         fclose(pipe_fd);
 179
 180         /* We read from pack_objects.err to capture stderr output for
 181          * progress bar, and pack_objects.out to capture the pack data.
 182          */
 183
 184         while (1) {
 185                 struct pollfd pfd[2];
 186                 int pe, pu, pollsize;
 187                 int ret;
 188
 189                 reset_timeout();
 190
 191                 pollsize = 0;
 192                 pe = pu = -1;
 193
 194                 if (0 <= pack_objects.out) {
 195                         pfd[pollsize].fd = pack_objects.out;
 196                         pfd[pollsize].events = POLLIN;
 197                         pu = pollsize;
 198                         pollsize++;
 199                 }
 200                 if (0 <= pack_objects.err) {
 201                         pfd[pollsize].fd = pack_objects.err;
 202                         pfd[pollsize].events = POLLIN;
 203                         pe = pollsize;
 204                         pollsize++;
 205                 }
 206
 207                 if (!pollsize)
 208                         break;
 209
 210                 ret = poll(pfd, pollsize,
 211                         keepalive < 0 ? -1 : 1000 * keepalive);
 212
 213                 if (ret < 0) {
 214                         if (errno != EINTR) {
 215                                 error_errno("poll failed, resuming");
 216                                 sleep(1);
 217                         }
 218                         continue;
 219                 }
 220                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 221                         /* Status ready; we ship that in the side-band
 222                          * or dump to the standard error.
 223                          */
 224                         sz = xread(pack_objects.err, progress,
 225                                   sizeof(progress));
 226                         if (0 < sz)
 227                                 send_client_data(2, progress, sz);
 228                         else if (sz == 0) {
 229                                 close(pack_objects.err);
 230                                 pack_objects.err = -1;
 231                         }
 232                         else
 233                                 goto fail;
 234                         /* give priority to status messages */
 235                         continue;
 236                 }
 237                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 238                         /* Data ready; we keep the last byte to ourselves
 239                          * in case we detect broken rev-list, so that we
 240                          * can leave the stream corrupted.  This is
 241                          * unfortunate -- unpack-objects would happily
 242                          * accept a valid packdata with trailing garbage,
 243                          * so appending garbage after we pass all the
 244                          * pack data is not good enough to signal
 245                          * breakage to downstream.
 246                          */
 247                         char *cp = data;
 248                         ssize_t outsz = 0;
 249                         if (0 <= buffered) {
 250                                 *cp++ = buffered;
 251                                 outsz++;
 252                         }
 253                         sz = xread(pack_objects.out, cp,
 254                                   sizeof(data) - outsz);
 255                         if (0 < sz)
 256                                 ;
 257                         else if (sz == 0) {
 258                                 close(pack_objects.out);
 259                                 pack_objects.out = -1;
 260                         }
 261                         else
 262                                 goto fail;
 263                         sz += outsz;
 264                         if (1 < sz) {
 265                                 buffered = data[sz-1] & 0xFF;
 266                                 sz--;
 267                         }
 268                         else
 269                                 buffered = -1;
 270                         send_client_data(1, data, sz);
 271                 }
 272
 273                 /*
 274                  * We hit the keepalive timeout without saying anything; send
 275                  * an empty message on the data sideband just to let the other
 276                  * side know we're still working on it, but don't have any data
 277                  * yet.
 278                  *
 279                  * If we don't have a sideband channel, there's no room in the
 280                  * protocol to say anything, so those clients are just out of
 281                  * luck.
 282                  */
 283                 if (!ret && use_sideband) {
 284                         static const char buf[] = "0005\1";
 285                         write_or_die(1, buf, 5);
 286                 }
 287         }
 288
 289         if (finish_command(&pack_objects)) {
 290                 error("git upload-pack: git-pack-objects died with error.");
 291                 goto fail;
 292         }
 293
 294         /* flush the data */
 295         if (0 <= buffered) {
 296                 data[0] = buffered;
 297                 send_client_data(1, data, 1);
 298                 fprintf(stderr, "flushed.\n");
 299         }
 300         if (use_sideband)
 301                 packet_flush(1);
 302         return;
 303
 304  fail:
 305         send_client_data(3, abort_msg, sizeof(abort_msg));
 306         die("git upload-pack: %s", abort_msg);
 307 }
 308
 309 static int got_oid(const char *hex, struct object_id *oid)
 310 {
 311         struct object *o;
 312         int we_knew_they_have = 0;
 313
 314         if (get_oid_hex(hex, oid))
 315                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 316         if (!has_object_file(oid))
 317                 return -1;
 318
 319         o = parse_object(oid);
 320         if (!o)
 321                 die("oops (%s)", oid_to_hex(oid));
 322         if (o->type == OBJ_COMMIT) {
 323                 struct commit_list *parents;
 324                 struct commit *commit = (struct commit *)o;
 325                 if (o->flags & THEY_HAVE)
 326                         we_knew_they_have = 1;
 327                 else
 328                         o->flags |= THEY_HAVE;
 329                 if (!oldest_have || (commit->date < oldest_have))
 330                         oldest_have = commit->date;
 331                 for (parents = commit->parents;
 332                      parents;
 333                      parents = parents->next)
 334                         parents->item->object.flags |= THEY_HAVE;
 335         }
 336         if (!we_knew_they_have) {
 337                 add_object_array(o, NULL, &have_obj);
 338                 return 1;
 339         }
 340         return 0;
 341 }
 342
 343 static int reachable(struct commit *want)
 344 {
 345         struct prio_queue work = { compare_commits_by_commit_date };
 346
 347         prio_queue_put(&work, want);
 348         while (work.nr) {
 349                 struct commit_list *list;
 350                 struct commit *commit = prio_queue_get(&work);
 351
 352                 if (commit->object.flags & THEY_HAVE) {
 353                         want->object.flags |= COMMON_KNOWN;
 354                         break;
 355                 }
 356                 if (!commit->object.parsed)
 357                         parse_object(&commit->object.oid);
 358                 if (commit->object.flags & REACHABLE)
 359                         continue;
 360                 commit->object.flags |= REACHABLE;
 361                 if (commit->date < oldest_have)
 362                         continue;
 363                 for (list = commit->parents; list; list = list->next) {
 364                         struct commit *parent = list->item;
 365                         if (!(parent->object.flags & REACHABLE))
 366                                 prio_queue_put(&work, parent);
 367                 }
 368         }
 369         want->object.flags |= REACHABLE;
 370         clear_commit_marks(want, REACHABLE);
 371         clear_prio_queue(&work);
 372         return (want->object.flags & COMMON_KNOWN);
 373 }
 374
 375 static int ok_to_give_up(void)
 376 {
 377         int i;
 378
 379         if (!have_obj.nr)
 380                 return 0;
 381
 382         for (i = 0; i < want_obj.nr; i++) {
 383                 struct object *want = want_obj.objects[i].item;
 384
 385                 if (want->flags & COMMON_KNOWN)
 386                         continue;
 387                 want = deref_tag(want, "a want line", 0);
 388                 if (!want || want->type != OBJ_COMMIT) {
 389                         /* no way to tell if this is reachable by
 390                          * looking at the ancestry chain alone, so
 391                          * leave a note to ourselves not to worry about
 392                          * this object anymore.
 393                          */
 394                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 395                         continue;
 396                 }
 397                 if (!reachable((struct commit *)want))
 398                         return 0;
 399         }
 400         return 1;
 401 }
 402
 403 static int get_common_commits(void)
 404 {
 405         struct object_id oid;
 406         char last_hex[GIT_MAX_HEXSZ + 1];
 407         int got_common = 0;
 408         int got_other = 0;
 409         int sent_ready = 0;
 410
 411         save_commit_buffer = 0;
 412
 413         for (;;) {
 414                 char *line = packet_read_line(0, NULL);
 415                 const char *arg;
 416
 417                 reset_timeout();
 418
 419                 if (!line) {
 420                         if (multi_ack == 2 && got_common
 421                             && !got_other && ok_to_give_up()) {
 422                                 sent_ready = 1;
 423                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 424                         }
 425                         if (have_obj.nr == 0 || multi_ack)
 426                                 packet_write_fmt(1, "NAK\n");
 427
 428                         if (no_done && sent_ready) {
 429                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 430                                 return 0;
 431                         }
 432                         if (stateless_rpc)
 433                                 exit(0);
 434                         got_common = 0;
 435                         got_other = 0;
 436                         continue;
 437                 }
 438                 if (skip_prefix(line, "have ", &arg)) {
 439                         switch (got_oid(arg, &oid)) {
 440                         case -1: /* they have what we do not */
 441                                 got_other = 1;
 442                                 if (multi_ack && ok_to_give_up()) {
 443                                         const char *hex = oid_to_hex(&oid);
 444                                         if (multi_ack == 2) {
 445                                                 sent_ready = 1;
 446                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 447                                         } else
 448                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 449                                 }
 450                                 break;
 451                         default:
 452                                 got_common = 1;
 453                                 memcpy(last_hex, oid_to_hex(&oid), 41);
 454                                 if (multi_ack == 2)
 455                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 456                                 else if (multi_ack)
 457                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 458                                 else if (have_obj.nr == 1)
 459                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 460                                 break;
 461                         }
 462                         continue;
 463                 }
 464                 if (!strcmp(line, "done")) {
 465                         if (have_obj.nr > 0) {
 466                                 if (multi_ack)
 467                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 468                                 return 0;
 469                         }
 470                         packet_write_fmt(1, "NAK\n");
 471                         return -1;
 472                 }
 473                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 474         }
 475 }
 476
 477 static int is_our_ref(struct object *o)
 478 {
 479         int allow_hidden_ref = (allow_unadvertised_object_request &
 480                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 481         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 482 }
 483
 484 /*
 485  * on successful case, it's up to the caller to close cmd->out
 486  */
 487 static int do_reachable_revlist(struct child_process *cmd,
 488                                 struct object_array *src,
 489                                 struct object_array *reachable)
 490 {
 491         static const char *argv[] = {
 492                 "rev-list", "--stdin", NULL,
 493         };
 494         struct object *o;
 495         char namebuf[42]; /* ^ + SHA-1 + LF */
 496         int i;
 497
 498         cmd->argv = argv;
 499         cmd->git_cmd = 1;
 500         cmd->no_stderr = 1;
 501         cmd->in = -1;
 502         cmd->out = -1;
 503
 504         /*
 505          * If the next rev-list --stdin encounters an unknown commit,
 506          * it terminates, which will cause SIGPIPE in the write loop
 507          * below.
 508          */
 509         sigchain_push(SIGPIPE, SIG_IGN);
 510
 511         if (start_command(cmd))
 512                 goto error;
 513
 514         namebuf[0] = '^';
 515         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 516         for (i = get_max_object_index(); 0 < i; ) {
 517                 o = get_indexed_object(--i);
 518                 if (!o)
 519                         continue;
 520                 if (reachable && o->type == OBJ_COMMIT)
 521                         o->flags &= ~TMP_MARK;
 522                 if (!is_our_ref(o))
 523                         continue;
 524                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 525                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 526                         goto error;
 527         }
 528         namebuf[GIT_SHA1_HEXSZ] = '\n';
 529         for (i = 0; i < src->nr; i++) {
 530                 o = src->objects[i].item;
 531                 if (is_our_ref(o)) {
 532                         if (reachable)
 533                                 add_object_array(o, NULL, reachable);
 534                         continue;
 535                 }
 536                 if (reachable && o->type == OBJ_COMMIT)
 537                         o->flags |= TMP_MARK;
 538                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 539                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 540                         goto error;
 541         }
 542         close(cmd->in);
 543         cmd->in = -1;
 544         sigchain_pop(SIGPIPE);
 545
 546         return 0;
 547
 548 error:
 549         sigchain_pop(SIGPIPE);
 550
 551         if (cmd->in >= 0)
 552                 close(cmd->in);
 553         if (cmd->out >= 0)
 554                 close(cmd->out);
 555         return -1;
 556 }
 557
 558 static int get_reachable_list(struct object_array *src,
 559                               struct object_array *reachable)
 560 {
 561         struct child_process cmd = CHILD_PROCESS_INIT;
 562         int i;
 563         struct object *o;
 564         char namebuf[42]; /* ^ + SHA-1 + LF */
 565
 566         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 567                 return -1;
 568
 569         while ((i = read_in_full(cmd.out, namebuf, 41)) == 41) {
 570                 struct object_id sha1;
 571
 572                 if (namebuf[40] != '\n' || get_oid_hex(namebuf, &sha1))
 573                         break;
 574
 575                 o = lookup_object(sha1.hash);
 576                 if (o && o->type == OBJ_COMMIT) {
 577                         o->flags &= ~TMP_MARK;
 578                 }
 579         }
 580         for (i = get_max_object_index(); 0 < i; i--) {
 581                 o = get_indexed_object(i - 1);
 582                 if (o && o->type == OBJ_COMMIT &&
 583                     (o->flags & TMP_MARK)) {
 584                         add_object_array(o, NULL, reachable);
 585                                 o->flags &= ~TMP_MARK;
 586                 }
 587         }
 588         close(cmd.out);
 589
 590         if (finish_command(&cmd))
 591                 return -1;
 592
 593         return 0;
 594 }
 595
 596 static int has_unreachable(struct object_array *src)
 597 {
 598         struct child_process cmd = CHILD_PROCESS_INIT;
 599         char buf[1];
 600         int i;
 601
 602         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 603                 return 1;
 604
 605         /*
 606          * The commits out of the rev-list are not ancestors of
 607          * our ref.
 608          */
 609         i = read_in_full(cmd.out, buf, 1);
 610         if (i)
 611                 goto error;
 612         close(cmd.out);
 613         cmd.out = -1;
 614
 615         /*
 616          * rev-list may have died by encountering a bad commit
 617          * in the history, in which case we do want to bail out
 618          * even when it showed no commit.
 619          */
 620         if (finish_command(&cmd))
 621                 goto error;
 622
 623         /* All the non-tip ones are ancestors of what we advertised */
 624         return 0;
 625
 626 error:
 627         sigchain_pop(SIGPIPE);
 628         if (cmd.out >= 0)
 629                 close(cmd.out);
 630         return 1;
 631 }
 632
 633 static void check_non_tip(void)
 634 {
 635         int i;
 636
 637         /*
 638          * In the normal in-process case without
 639          * uploadpack.allowReachableSHA1InWant,
 640          * non-tip requests can never happen.
 641          */
 642         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 643                 goto error;
 644         if (!has_unreachable(&want_obj))
 645                 /* All the non-tip ones are ancestors of what we advertised */
 646                 return;
 647
 648 error:
 649         /* Pick one of them (we know there at least is one) */
 650         for (i = 0; i < want_obj.nr; i++) {
 651                 struct object *o = want_obj.objects[i].item;
 652                 if (!is_our_ref(o))
 653                         die("git upload-pack: not our ref %s",
 654                             oid_to_hex(&o->oid));
 655         }
 656 }
 657
 658 static void send_shallow(struct commit_list *result)
 659 {
 660         while (result) {
 661                 struct object *object = &result->item->object;
 662                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 663                         packet_write_fmt(1, "shallow %s",
 664                                          oid_to_hex(&object->oid));
 665                         register_shallow(&object->oid);
 666                         shallow_nr++;
 667                 }
 668                 result = result->next;
 669         }
 670 }
 671
 672 static void send_unshallow(const struct object_array *shallows)
 673 {
 674         int i;
 675
 676         for (i = 0; i < shallows->nr; i++) {
 677                 struct object *object = shallows->objects[i].item;
 678                 if (object->flags & NOT_SHALLOW) {
 679                         struct commit_list *parents;
 680                         packet_write_fmt(1, "unshallow %s",
 681                                          oid_to_hex(&object->oid));
 682                         object->flags &= ~CLIENT_SHALLOW;
 683                         /*
 684                          * We want to _register_ "object" as shallow, but we
 685                          * also need to traverse object's parents to deepen a
 686                          * shallow clone. Unregister it for now so we can
 687                          * parse and add the parents to the want list, then
 688                          * re-register it.
 689                          */
 690                         unregister_shallow(&object->oid);
 691                         object->parsed = 0;
 692                         parse_commit_or_die((struct commit *)object);
 693                         parents = ((struct commit *)object)->parents;
 694                         while (parents) {
 695                                 add_object_array(&parents->item->object,
 696                                                  NULL, &want_obj);
 697                                 parents = parents->next;
 698                         }
 699                         add_object_array(object, NULL, &extra_edge_obj);
 700                 }
 701                 /* make sure commit traversal conforms to client */
 702                 register_shallow(&object->oid);
 703         }
 704 }
 705
 706 static void deepen(int depth, int deepen_relative,
 707                    struct object_array *shallows)
 708 {
 709         if (depth == INFINITE_DEPTH && !is_repository_shallow()) {
 710                 int i;
 711
 712                 for (i = 0; i < shallows->nr; i++) {
 713                         struct object *object = shallows->objects[i].item;
 714                         object->flags |= NOT_SHALLOW;
 715                 }
 716         } else if (deepen_relative) {
 717                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 718                 struct commit_list *result;
 719
 720                 get_reachable_list(shallows, &reachable_shallows);
 721                 result = get_shallow_commits(&reachable_shallows,
 722                                              depth + 1,
 723                                              SHALLOW, NOT_SHALLOW);
 724                 send_shallow(result);
 725                 free_commit_list(result);
 726                 object_array_clear(&reachable_shallows);
 727         } else {
 728                 struct commit_list *result;
 729
 730                 result = get_shallow_commits(&want_obj, depth,
 731                                              SHALLOW, NOT_SHALLOW);
 732                 send_shallow(result);
 733                 free_commit_list(result);
 734         }
 735
 736         send_unshallow(shallows);
 737         packet_flush(1);
 738 }
 739
 740 static void deepen_by_rev_list(int ac, const char **av,
 741                                struct object_array *shallows)
 742 {
 743         struct commit_list *result;
 744
 745         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 746         send_shallow(result);
 747         free_commit_list(result);
 748         send_unshallow(shallows);
 749         packet_flush(1);
 750 }
 751
 752 static void receive_needs(void)
 753 {
 754         struct object_array shallows = OBJECT_ARRAY_INIT;
 755         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 756         int depth = 0;
 757         int has_non_tip = 0;
 758         timestamp_t deepen_since = 0;
 759         int deepen_rev_list = 0;
 760
 761         shallow_nr = 0;
 762         for (;;) {
 763                 struct object *o;
 764                 const char *features;
 765                 struct object_id oid_buf;
 766                 char *line = packet_read_line(0, NULL);
 767                 const char *arg;
 768
 769                 reset_timeout();
 770                 if (!line)
 771                         break;
 772
 773                 if (skip_prefix(line, "shallow ", &arg)) {
 774                         struct object_id oid;
 775                         struct object *object;
 776                         if (get_oid_hex(arg, &oid))
 777                                 die("invalid shallow line: %s", line);
 778                         object = parse_object(&oid);
 779                         if (!object)
 780                                 continue;
 781                         if (object->type != OBJ_COMMIT)
 782                                 die("invalid shallow object %s", oid_to_hex(&oid));
 783                         if (!(object->flags & CLIENT_SHALLOW)) {
 784                                 object->flags |= CLIENT_SHALLOW;
 785                                 add_object_array(object, NULL, &shallows);
 786                         }
 787                         continue;
 788                 }
 789                 if (skip_prefix(line, "deepen ", &arg)) {
 790                         char *end = NULL;
 791                         depth = strtol(arg, &end, 0);
 792                         if (!end || *end || depth <= 0)
 793                                 die("Invalid deepen: %s", line);
 794                         continue;
 795                 }
 796                 if (skip_prefix(line, "deepen-since ", &arg)) {
 797                         char *end = NULL;
 798                         deepen_since = parse_timestamp(arg, &end, 0);
 799                         if (!end || *end || !deepen_since ||
 800                             /* revisions.c's max_age -1 is special */
 801                             deepen_since == -1)
 802                                 die("Invalid deepen-since: %s", line);
 803                         deepen_rev_list = 1;
 804                         continue;
 805                 }
 806                 if (skip_prefix(line, "deepen-not ", &arg)) {
 807                         char *ref = NULL;
 808                         struct object_id oid;
 809                         if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 810                                 die("git upload-pack: ambiguous deepen-not: %s", line);
 811                         string_list_append(&deepen_not, ref);
 812                         free(ref);
 813                         deepen_rev_list = 1;
 814                         continue;
 815                 }
 816                 if (skip_prefix(line, "filter ", &arg)) {
 817                         if (!filter_capability_requested)
 818                                 die("git upload-pack: filtering capability not negotiated");
 819                         parse_list_objects_filter(&filter_options, arg);
 820                         continue;
 821                 }
 822                 if (!skip_prefix(line, "want ", &arg) ||
 823                     get_oid_hex(arg, &oid_buf))
 824                         die("git upload-pack: protocol error, "
 825                             "expected to get sha, not '%s'", line);
 826
 827                 features = arg + 40;
 828
 829                 if (parse_feature_request(features, "deepen-relative"))
 830                         deepen_relative = 1;
 831                 if (parse_feature_request(features, "multi_ack_detailed"))
 832                         multi_ack = 2;
 833                 else if (parse_feature_request(features, "multi_ack"))
 834                         multi_ack = 1;
 835                 if (parse_feature_request(features, "no-done"))
 836                         no_done = 1;
 837                 if (parse_feature_request(features, "thin-pack"))
 838                         use_thin_pack = 1;
 839                 if (parse_feature_request(features, "ofs-delta"))
 840                         use_ofs_delta = 1;
 841                 if (parse_feature_request(features, "side-band-64k"))
 842                         use_sideband = LARGE_PACKET_MAX;
 843                 else if (parse_feature_request(features, "side-band"))
 844                         use_sideband = DEFAULT_PACKET_MAX;
 845                 if (parse_feature_request(features, "no-progress"))
 846                         no_progress = 1;
 847                 if (parse_feature_request(features, "include-tag"))
 848                         use_include_tag = 1;
 849                 if (allow_filter && parse_feature_request(features, "filter"))
 850                         filter_capability_requested = 1;
 851
 852                 o = parse_object(&oid_buf);
 853                 if (!o) {
 854                         packet_write_fmt(1,
 855                                          "ERR upload-pack: not our ref %s",
 856                                          oid_to_hex(&oid_buf));
 857                         die("git upload-pack: not our ref %s",
 858                             oid_to_hex(&oid_buf));
 859                 }
 860                 if (!(o->flags & WANTED)) {
 861                         o->flags |= WANTED;
 862                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 863                               || is_our_ref(o)))
 864                                 has_non_tip = 1;
 865                         add_object_array(o, NULL, &want_obj);
 866                 }
 867         }
 868
 869         /*
 870          * We have sent all our refs already, and the other end
 871          * should have chosen out of them. When we are operating
 872          * in the stateless RPC mode, however, their choice may
 873          * have been based on the set of older refs advertised
 874          * by another process that handled the initial request.
 875          */
 876         if (has_non_tip)
 877                 check_non_tip();
 878
 879         if (!use_sideband && daemon_mode)
 880                 no_progress = 1;
 881
 882         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 883                 return;
 884         if (depth > 0 && deepen_rev_list)
 885                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 886         if (depth > 0)
 887                 deepen(depth, deepen_relative, &shallows);
 888         else if (deepen_rev_list) {
 889                 struct argv_array av = ARGV_ARRAY_INIT;
 890                 int i;
 891
 892                 argv_array_push(&av, "rev-list");
 893                 if (deepen_since)
 894                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 895                 if (deepen_not.nr) {
 896                         argv_array_push(&av, "--not");
 897                         for (i = 0; i < deepen_not.nr; i++) {
 898                                 struct string_list_item *s = deepen_not.items + i;
 899                                 argv_array_push(&av, s->string);
 900                         }
 901                         argv_array_push(&av, "--not");
 902                 }
 903                 for (i = 0; i < want_obj.nr; i++) {
 904                         struct object *o = want_obj.objects[i].item;
 905                         argv_array_push(&av, oid_to_hex(&o->oid));
 906                 }
 907                 deepen_by_rev_list(av.argc, av.argv, &shallows);
 908                 argv_array_clear(&av);
 909         }
 910         else
 911                 if (shallows.nr > 0) {
 912                         int i;
 913                         for (i = 0; i < shallows.nr; i++)
 914                                 register_shallow(&shallows.objects[i].item->oid);
 915                 }
 916
 917         shallow_nr += shallows.nr;
 918         object_array_clear(&shallows);
 919 }
 920
 921 /* return non-zero if the ref is hidden, otherwise 0 */
 922 static int mark_our_ref(const char *refname, const char *refname_full,
 923                         const struct object_id *oid)
 924 {
 925         struct object *o = lookup_unknown_object(oid->hash);
 926
 927         if (ref_is_hidden(refname, refname_full)) {
 928                 o->flags |= HIDDEN_REF;
 929                 return 1;
 930         }
 931         o->flags |= OUR_REF;
 932         return 0;
 933 }
 934
 935 static int check_ref(const char *refname_full, const struct object_id *oid,
 936                      int flag, void *cb_data)
 937 {
 938         const char *refname = strip_namespace(refname_full);
 939
 940         mark_our_ref(refname, refname_full, oid);
 941         return 0;
 942 }
 943
 944 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 945 {
 946         struct string_list_item *item;
 947
 948         if (!symref->nr)
 949                 return;
 950         for_each_string_list_item(item, symref)
 951                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 952 }
 953
 954 static int send_ref(const char *refname, const struct object_id *oid,
 955                     int flag, void *cb_data)
 956 {
 957         static const char *capabilities = "multi_ack thin-pack side-band"
 958                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 959                 " deepen-relative no-progress include-tag multi_ack_detailed";
 960         const char *refname_nons = strip_namespace(refname);
 961         struct object_id peeled;
 962
 963         if (mark_our_ref(refname_nons, refname, oid))
 964                 return 0;
 965
 966         if (capabilities) {
 967                 struct strbuf symref_info = STRBUF_INIT;
 968
 969                 format_symref_info(&symref_info, cb_data);
 970                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
 971                              oid_to_hex(oid), refname_nons,
 972                              0, capabilities,
 973                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 974                                      " allow-tip-sha1-in-want" : "",
 975                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 976                                      " allow-reachable-sha1-in-want" : "",
 977                              stateless_rpc ? " no-done" : "",
 978                              symref_info.buf,
 979                              allow_filter ? " filter" : "",
 980                              git_user_agent_sanitized());
 981                 strbuf_release(&symref_info);
 982         } else {
 983                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 984         }
 985         capabilities = NULL;
 986         if (!peel_ref(refname, &peeled))
 987                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 988         return 0;
 989 }
 990
 991 static int find_symref(const char *refname, const struct object_id *oid,
 992                        int flag, void *cb_data)
 993 {
 994         const char *symref_target;
 995         struct string_list_item *item;
 996
 997         if ((flag & REF_ISSYMREF) == 0)
 998                 return 0;
 999         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1000         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1001                 die("'%s' is a symref but it is not?", refname);
1002         item = string_list_append(cb_data, refname);
1003         item->util = xstrdup(symref_target);
1004         return 0;
1005 }
1006
1007 static void upload_pack(void)
1008 {
1009         struct string_list symref = STRING_LIST_INIT_DUP;
1010
1011         head_ref_namespaced(find_symref, &symref);
1012
1013         if (advertise_refs || !stateless_rpc) {
1014                 reset_timeout();
1015                 head_ref_namespaced(send_ref, &symref);
1016                 for_each_namespaced_ref(send_ref, &symref);
1017                 advertise_shallow_grafts(1);
1018                 packet_flush(1);
1019         } else {
1020                 head_ref_namespaced(check_ref, NULL);
1021                 for_each_namespaced_ref(check_ref, NULL);
1022         }
1023         string_list_clear(&symref, 1);
1024         if (advertise_refs)
1025                 return;
1026
1027         receive_needs();
1028         if (want_obj.nr) {
1029                 get_common_commits();
1030                 create_pack_file();
1031         }
1032 }
1033
1034 static int upload_pack_config(const char *var, const char *value, void *unused)
1035 {
1036         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1037                 if (git_config_bool(var, value))
1038                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1039                 else
1040                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1041         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1042                 if (git_config_bool(var, value))
1043                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1044                 else
1045                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1046         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1047                 if (git_config_bool(var, value))
1048                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1049                 else
1050                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1051         } else if (!strcmp("uploadpack.keepalive", var)) {
1052                 keepalive = git_config_int(var, value);
1053                 if (!keepalive)
1054                         keepalive = -1;
1055         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1056                 if (!strcmp("uploadpack.packobjectshook", var))
1057                         return git_config_string(&pack_objects_hook, var, value);
1058         } else if (!strcmp("uploadpack.allowfilter", var)) {
1059                 allow_filter = git_config_bool(var, value);
1060         }
1061         return parse_hide_refs_config(var, value, "uploadpack");
1062 }
1063
1064 int cmd_main(int argc, const char **argv)
1065 {
1066         const char *dir;
1067         int strict = 0;
1068         struct option options[] = {
1069                 OPT_BOOL(0, "stateless-rpc", &stateless_rpc,
1070                          N_("quit after a single request/response exchange")),
1071                 OPT_BOOL(0, "advertise-refs", &advertise_refs,
1072                          N_("exit immediately after initial ref advertisement")),
1073                 OPT_BOOL(0, "strict", &strict,
1074                          N_("do not try <directory>/.git/ if <directory> is no Git directory")),
1075                 OPT_INTEGER(0, "timeout", &timeout,
1076                             N_("interrupt transfer after <n> seconds of inactivity")),
1077                 OPT_END()
1078         };
1079
1080         packet_trace_identity("upload-pack");
1081         check_replace_refs = 0;
1082
1083         argc = parse_options(argc, argv, NULL, options, upload_pack_usage, 0);
1084
1085         if (argc != 1)
1086                 usage_with_options(upload_pack_usage, options);
1087
1088         if (timeout)
1089                 daemon_mode = 1;
1090
1091         setup_path();
1092
1093         dir = argv[0];
1094
1095         if (!enter_repo(dir, strict))
1096                 die("'%s' does not appear to be a git repository", dir);
1097
1098         git_config(upload_pack_config, NULL);
1099
1100         switch (determine_protocol_version_server()) {
1101         case protocol_v1:
1102                 /*
1103                  * v1 is just the original protocol with a version string,
1104                  * so just fall through after writing the version string.
1105                  */
1106                 if (advertise_refs || !stateless_rpc)
1107                         packet_write_fmt(1, "version 1\n");
1108
1109                 /* fallthrough */
1110         case protocol_v0:
1111                 upload_pack();
1112                 break;
1113         case protocol_unknown_version:
1114                 BUG("unknown protocol version");
1115         }
1116
1117         return 0;
1118 }