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