git.oblomov.eu Git - git/blob - upload-pack.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "object-store.h"
   7 #include "tag.h"
   8 #include "object.h"
   9 #include "commit.h"
  10 #include "exec_cmd.h"
  11 #include "diff.h"
  12 #include "revision.h"
  13 #include "list-objects.h"
  14 #include "list-objects-filter.h"
  15 #include "list-objects-filter-options.h"
  16 #include "run-command.h"
  17 #include "connect.h"
  18 #include "sigchain.h"
  19 #include "version.h"
  20 #include "string-list.h"
  21 #include "parse-options.h"
  22 #include "argv-array.h"
  23 #include "prio-queue.h"
  24 #include "protocol.h"
  25 #include "quote.h"
  26
  27 static const char * const upload_pack_usage[] = {
  28         N_("git upload-pack [<options>] <dir>"),
  29         NULL
  30 };
  31
  32 /* Remember to update object flag allocation in object.h */
  33 #define THEY_HAVE       (1u << 11)
  34 #define OUR_REF         (1u << 12)
  35 #define WANTED          (1u << 13)
  36 #define COMMON_KNOWN    (1u << 14)
  37 #define REACHABLE       (1u << 15)
  38
  39 #define SHALLOW         (1u << 16)
  40 #define NOT_SHALLOW     (1u << 17)
  41 #define CLIENT_SHALLOW  (1u << 18)
  42 #define HIDDEN_REF      (1u << 19)
  43
  44 static timestamp_t oldest_have;
  45
  46 static int deepen_relative;
  47 static int multi_ack;
  48 static int no_done;
  49 static int use_thin_pack, use_ofs_delta, use_include_tag;
  50 static int no_progress, daemon_mode;
  51 /* Allow specifying sha1 if it is a ref tip. */
  52 #define ALLOW_TIP_SHA1  01
  53 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  54 #define ALLOW_REACHABLE_SHA1    02
  55 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  56 #define ALLOW_ANY_SHA1  07
  57 static unsigned int allow_unadvertised_object_request;
  58 static int shallow_nr;
  59 static struct object_array have_obj;
  60 static struct object_array want_obj;
  61 static struct object_array extra_edge_obj;
  62 static unsigned int timeout;
  63 static int keepalive = 5;
  64 /* 0 for no sideband,
  65  * otherwise maximum packet size (up to 65520 bytes).
  66  */
  67 static int use_sideband;
  68 static int advertise_refs;
  69 static int stateless_rpc;
  70 static const char *pack_objects_hook;
  71
  72 static int filter_capability_requested;
  73 static int allow_filter;
  74 static struct list_objects_filter_options filter_options;
  75
  76 static void reset_timeout(void)
  77 {
  78         alarm(timeout);
  79 }
  80
  81 static void send_client_data(int fd, const char *data, ssize_t sz)
  82 {
  83         if (use_sideband) {
  84                 send_sideband(1, fd, data, sz, use_sideband);
  85                 return;
  86         }
  87         if (fd == 3)
  88                 /* emergency quit */
  89                 fd = 2;
  90         if (fd == 2) {
  91                 /* XXX: are we happy to lose stuff here? */
  92                 xwrite(fd, data, sz);
  93                 return;
  94         }
  95         write_or_die(fd, data, sz);
  96 }
  97
  98 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  99 {
 100         FILE *fp = cb_data;
 101         if (graft->nr_parent == -1)
 102                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 103         return 0;
 104 }
 105
 106 static void create_pack_file(void)
 107 {
 108         struct child_process pack_objects = CHILD_PROCESS_INIT;
 109         char data[8193], progress[128];
 110         char abort_msg[] = "aborting due to possible repository "
 111                 "corruption on the remote side.";
 112         int buffered = -1;
 113         ssize_t sz;
 114         int i;
 115         FILE *pipe_fd;
 116
 117         if (!pack_objects_hook)
 118                 pack_objects.git_cmd = 1;
 119         else {
 120                 argv_array_push(&pack_objects.args, pack_objects_hook);
 121                 argv_array_push(&pack_objects.args, "git");
 122                 pack_objects.use_shell = 1;
 123         }
 124
 125         if (shallow_nr) {
 126                 argv_array_push(&pack_objects.args, "--shallow-file");
 127                 argv_array_push(&pack_objects.args, "");
 128         }
 129         argv_array_push(&pack_objects.args, "pack-objects");
 130         argv_array_push(&pack_objects.args, "--revs");
 131         if (use_thin_pack)
 132                 argv_array_push(&pack_objects.args, "--thin");
 133
 134         argv_array_push(&pack_objects.args, "--stdout");
 135         if (shallow_nr)
 136                 argv_array_push(&pack_objects.args, "--shallow");
 137         if (!no_progress)
 138                 argv_array_push(&pack_objects.args, "--progress");
 139         if (use_ofs_delta)
 140                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 141         if (use_include_tag)
 142                 argv_array_push(&pack_objects.args, "--include-tag");
 143         if (filter_options.filter_spec) {
 144                 if (pack_objects.use_shell) {
 145                         struct strbuf buf = STRBUF_INIT;
 146                         sq_quote_buf(&buf, filter_options.filter_spec);
 147                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 148                         strbuf_release(&buf);
 149                 } else {
 150                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 151                                          filter_options.filter_spec);
 152                 }
 153         }
 154
 155         pack_objects.in = -1;
 156         pack_objects.out = -1;
 157         pack_objects.err = -1;
 158
 159         if (start_command(&pack_objects))
 160                 die("git upload-pack: unable to fork git-pack-objects");
 161
 162         pipe_fd = xfdopen(pack_objects.in, "w");
 163
 164         if (shallow_nr)
 165                 for_each_commit_graft(write_one_shallow, pipe_fd);
 166
 167         for (i = 0; i < want_obj.nr; i++)
 168                 fprintf(pipe_fd, "%s\n",
 169                         oid_to_hex(&want_obj.objects[i].item->oid));
 170         fprintf(pipe_fd, "--not\n");
 171         for (i = 0; i < have_obj.nr; i++)
 172                 fprintf(pipe_fd, "%s\n",
 173                         oid_to_hex(&have_obj.objects[i].item->oid));
 174         for (i = 0; i < extra_edge_obj.nr; i++)
 175                 fprintf(pipe_fd, "%s\n",
 176                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 177         fprintf(pipe_fd, "\n");
 178         fflush(pipe_fd);
 179         fclose(pipe_fd);
 180
 181         /* We read from pack_objects.err to capture stderr output for
 182          * progress bar, and pack_objects.out to capture the pack data.
 183          */
 184
 185         while (1) {
 186                 struct pollfd pfd[2];
 187                 int pe, pu, pollsize;
 188                 int ret;
 189
 190                 reset_timeout();
 191
 192                 pollsize = 0;
 193                 pe = pu = -1;
 194
 195                 if (0 <= pack_objects.out) {
 196                         pfd[pollsize].fd = pack_objects.out;
 197                         pfd[pollsize].events = POLLIN;
 198                         pu = pollsize;
 199                         pollsize++;
 200                 }
 201                 if (0 <= pack_objects.err) {
 202                         pfd[pollsize].fd = pack_objects.err;
 203                         pfd[pollsize].events = POLLIN;
 204                         pe = pollsize;
 205                         pollsize++;
 206                 }
 207
 208                 if (!pollsize)
 209                         break;
 210
 211                 ret = poll(pfd, pollsize,
 212                         keepalive < 0 ? -1 : 1000 * keepalive);
 213
 214                 if (ret < 0) {
 215                         if (errno != EINTR) {
 216                                 error_errno("poll failed, resuming");
 217                                 sleep(1);
 218                         }
 219                         continue;
 220                 }
 221                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 222                         /* Status ready; we ship that in the side-band
 223                          * or dump to the standard error.
 224                          */
 225                         sz = xread(pack_objects.err, progress,
 226                                   sizeof(progress));
 227                         if (0 < sz)
 228                                 send_client_data(2, progress, sz);
 229                         else if (sz == 0) {
 230                                 close(pack_objects.err);
 231                                 pack_objects.err = -1;
 232                         }
 233                         else
 234                                 goto fail;
 235                         /* give priority to status messages */
 236                         continue;
 237                 }
 238                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 239                         /* Data ready; we keep the last byte to ourselves
 240                          * in case we detect broken rev-list, so that we
 241                          * can leave the stream corrupted.  This is
 242                          * unfortunate -- unpack-objects would happily
 243                          * accept a valid packdata with trailing garbage,
 244                          * so appending garbage after we pass all the
 245                          * pack data is not good enough to signal
 246                          * breakage to downstream.
 247                          */
 248                         char *cp = data;
 249                         ssize_t outsz = 0;
 250                         if (0 <= buffered) {
 251                                 *cp++ = buffered;
 252                                 outsz++;
 253                         }
 254                         sz = xread(pack_objects.out, cp,
 255                                   sizeof(data) - outsz);
 256                         if (0 < sz)
 257                                 ;
 258                         else if (sz == 0) {
 259                                 close(pack_objects.out);
 260                                 pack_objects.out = -1;
 261                         }
 262                         else
 263                                 goto fail;
 264                         sz += outsz;
 265                         if (1 < sz) {
 266                                 buffered = data[sz-1] & 0xFF;
 267                                 sz--;
 268                         }
 269                         else
 270                                 buffered = -1;
 271                         send_client_data(1, data, sz);
 272                 }
 273
 274                 /*
 275                  * We hit the keepalive timeout without saying anything; send
 276                  * an empty message on the data sideband just to let the other
 277                  * side know we're still working on it, but don't have any data
 278                  * yet.
 279                  *
 280                  * If we don't have a sideband channel, there's no room in the
 281                  * protocol to say anything, so those clients are just out of
 282                  * luck.
 283                  */
 284                 if (!ret && use_sideband) {
 285                         static const char buf[] = "0005\1";
 286                         write_or_die(1, buf, 5);
 287                 }
 288         }
 289
 290         if (finish_command(&pack_objects)) {
 291                 error("git upload-pack: git-pack-objects died with error.");
 292                 goto fail;
 293         }
 294
 295         /* flush the data */
 296         if (0 <= buffered) {
 297                 data[0] = buffered;
 298                 send_client_data(1, data, 1);
 299                 fprintf(stderr, "flushed.\n");
 300         }
 301         if (use_sideband)
 302                 packet_flush(1);
 303         return;
 304
 305  fail:
 306         send_client_data(3, abort_msg, sizeof(abort_msg));
 307         die("git upload-pack: %s", abort_msg);
 308 }
 309
 310 static int got_oid(const char *hex, struct object_id *oid)
 311 {
 312         struct object *o;
 313         int we_knew_they_have = 0;
 314
 315         if (get_oid_hex(hex, oid))
 316                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 317         if (!has_object_file(oid))
 318                 return -1;
 319
 320         o = parse_object(oid);
 321         if (!o)
 322                 die("oops (%s)", oid_to_hex(oid));
 323         if (o->type == OBJ_COMMIT) {
 324                 struct commit_list *parents;
 325                 struct commit *commit = (struct commit *)o;
 326                 if (o->flags & THEY_HAVE)
 327                         we_knew_they_have = 1;
 328                 else
 329                         o->flags |= THEY_HAVE;
 330                 if (!oldest_have || (commit->date < oldest_have))
 331                         oldest_have = commit->date;
 332                 for (parents = commit->parents;
 333                      parents;
 334                      parents = parents->next)
 335                         parents->item->object.flags |= THEY_HAVE;
 336         }
 337         if (!we_knew_they_have) {
 338                 add_object_array(o, NULL, &have_obj);
 339                 return 1;
 340         }
 341         return 0;
 342 }
 343
 344 static int reachable(struct commit *want)
 345 {
 346         struct prio_queue work = { compare_commits_by_commit_date };
 347
 348         prio_queue_put(&work, want);
 349         while (work.nr) {
 350                 struct commit_list *list;
 351                 struct commit *commit = prio_queue_get(&work);
 352
 353                 if (commit->object.flags & THEY_HAVE) {
 354                         want->object.flags |= COMMON_KNOWN;
 355                         break;
 356                 }
 357                 if (!commit->object.parsed)
 358                         parse_object(&commit->object.oid);
 359                 if (commit->object.flags & REACHABLE)
 360                         continue;
 361                 commit->object.flags |= REACHABLE;
 362                 if (commit->date < oldest_have)
 363                         continue;
 364                 for (list = commit->parents; list; list = list->next) {
 365                         struct commit *parent = list->item;
 366                         if (!(parent->object.flags & REACHABLE))
 367                                 prio_queue_put(&work, parent);
 368                 }
 369         }
 370         want->object.flags |= REACHABLE;
 371         clear_commit_marks(want, REACHABLE);
 372         clear_prio_queue(&work);
 373         return (want->object.flags & COMMON_KNOWN);
 374 }
 375
 376 static int ok_to_give_up(void)
 377 {
 378         int i;
 379
 380         if (!have_obj.nr)
 381                 return 0;
 382
 383         for (i = 0; i < want_obj.nr; i++) {
 384                 struct object *want = want_obj.objects[i].item;
 385
 386                 if (want->flags & COMMON_KNOWN)
 387                         continue;
 388                 want = deref_tag(want, "a want line", 0);
 389                 if (!want || want->type != OBJ_COMMIT) {
 390                         /* no way to tell if this is reachable by
 391                          * looking at the ancestry chain alone, so
 392                          * leave a note to ourselves not to worry about
 393                          * this object anymore.
 394                          */
 395                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 396                         continue;
 397                 }
 398                 if (!reachable((struct commit *)want))
 399                         return 0;
 400         }
 401         return 1;
 402 }
 403
 404 static int get_common_commits(void)
 405 {
 406         struct object_id oid;
 407         char last_hex[GIT_MAX_HEXSZ + 1];
 408         int got_common = 0;
 409         int got_other = 0;
 410         int sent_ready = 0;
 411
 412         save_commit_buffer = 0;
 413
 414         for (;;) {
 415                 char *line = packet_read_line(0, NULL);
 416                 const char *arg;
 417
 418                 reset_timeout();
 419
 420                 if (!line) {
 421                         if (multi_ack == 2 && got_common
 422                             && !got_other && ok_to_give_up()) {
 423                                 sent_ready = 1;
 424                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 425                         }
 426                         if (have_obj.nr == 0 || multi_ack)
 427                                 packet_write_fmt(1, "NAK\n");
 428
 429                         if (no_done && sent_ready) {
 430                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 431                                 return 0;
 432                         }
 433                         if (stateless_rpc)
 434                                 exit(0);
 435                         got_common = 0;
 436                         got_other = 0;
 437                         continue;
 438                 }
 439                 if (skip_prefix(line, "have ", &arg)) {
 440                         switch (got_oid(arg, &oid)) {
 441                         case -1: /* they have what we do not */
 442                                 got_other = 1;
 443                                 if (multi_ack && ok_to_give_up()) {
 444                                         const char *hex = oid_to_hex(&oid);
 445                                         if (multi_ack == 2) {
 446                                                 sent_ready = 1;
 447                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 448                                         } else
 449                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 450                                 }
 451                                 break;
 452                         default:
 453                                 got_common = 1;
 454                                 memcpy(last_hex, oid_to_hex(&oid), 41);
 455                                 if (multi_ack == 2)
 456                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 457                                 else if (multi_ack)
 458                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 459                                 else if (have_obj.nr == 1)
 460                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 461                                 break;
 462                         }
 463                         continue;
 464                 }
 465                 if (!strcmp(line, "done")) {
 466                         if (have_obj.nr > 0) {
 467                                 if (multi_ack)
 468                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 469                                 return 0;
 470                         }
 471                         packet_write_fmt(1, "NAK\n");
 472                         return -1;
 473                 }
 474                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 475         }
 476 }
 477
 478 static int is_our_ref(struct object *o)
 479 {
 480         int allow_hidden_ref = (allow_unadvertised_object_request &
 481                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 482         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 483 }
 484
 485 /*
 486  * on successful case, it's up to the caller to close cmd->out
 487  */
 488 static int do_reachable_revlist(struct child_process *cmd,
 489                                 struct object_array *src,
 490                                 struct object_array *reachable)
 491 {
 492         static const char *argv[] = {
 493                 "rev-list", "--stdin", NULL,
 494         };
 495         struct object *o;
 496         char namebuf[42]; /* ^ + SHA-1 + LF */
 497         int i;
 498
 499         cmd->argv = argv;
 500         cmd->git_cmd = 1;
 501         cmd->no_stderr = 1;
 502         cmd->in = -1;
 503         cmd->out = -1;
 504
 505         /*
 506          * If the next rev-list --stdin encounters an unknown commit,
 507          * it terminates, which will cause SIGPIPE in the write loop
 508          * below.
 509          */
 510         sigchain_push(SIGPIPE, SIG_IGN);
 511
 512         if (start_command(cmd))
 513                 goto error;
 514
 515         namebuf[0] = '^';
 516         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 517         for (i = get_max_object_index(); 0 < i; ) {
 518                 o = get_indexed_object(--i);
 519                 if (!o)
 520                         continue;
 521                 if (reachable && o->type == OBJ_COMMIT)
 522                         o->flags &= ~TMP_MARK;
 523                 if (!is_our_ref(o))
 524                         continue;
 525                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 526                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 527                         goto error;
 528         }
 529         namebuf[GIT_SHA1_HEXSZ] = '\n';
 530         for (i = 0; i < src->nr; i++) {
 531                 o = src->objects[i].item;
 532                 if (is_our_ref(o)) {
 533                         if (reachable)
 534                                 add_object_array(o, NULL, reachable);
 535                         continue;
 536                 }
 537                 if (reachable && o->type == OBJ_COMMIT)
 538                         o->flags |= TMP_MARK;
 539                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 540                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 541                         goto error;
 542         }
 543         close(cmd->in);
 544         cmd->in = -1;
 545         sigchain_pop(SIGPIPE);
 546
 547         return 0;
 548
 549 error:
 550         sigchain_pop(SIGPIPE);
 551
 552         if (cmd->in >= 0)
 553                 close(cmd->in);
 554         if (cmd->out >= 0)
 555                 close(cmd->out);
 556         return -1;
 557 }
 558
 559 static int get_reachable_list(struct object_array *src,
 560                               struct object_array *reachable)
 561 {
 562         struct child_process cmd = CHILD_PROCESS_INIT;
 563         int i;
 564         struct object *o;
 565         char namebuf[42]; /* ^ + SHA-1 + LF */
 566
 567         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 568                 return -1;
 569
 570         while ((i = read_in_full(cmd.out, namebuf, 41)) == 41) {
 571                 struct object_id sha1;
 572
 573                 if (namebuf[40] != '\n' || get_oid_hex(namebuf, &sha1))
 574                         break;
 575
 576                 o = lookup_object(sha1.hash);
 577                 if (o && o->type == OBJ_COMMIT) {
 578                         o->flags &= ~TMP_MARK;
 579                 }
 580         }
 581         for (i = get_max_object_index(); 0 < i; i--) {
 582                 o = get_indexed_object(i - 1);
 583                 if (o && o->type == OBJ_COMMIT &&
 584                     (o->flags & TMP_MARK)) {
 585                         add_object_array(o, NULL, reachable);
 586                                 o->flags &= ~TMP_MARK;
 587                 }
 588         }
 589         close(cmd.out);
 590
 591         if (finish_command(&cmd))
 592                 return -1;
 593
 594         return 0;
 595 }
 596
 597 static int has_unreachable(struct object_array *src)
 598 {
 599         struct child_process cmd = CHILD_PROCESS_INIT;
 600         char buf[1];
 601         int i;
 602
 603         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 604                 return 1;
 605
 606         /*
 607          * The commits out of the rev-list are not ancestors of
 608          * our ref.
 609          */
 610         i = read_in_full(cmd.out, buf, 1);
 611         if (i)
 612                 goto error;
 613         close(cmd.out);
 614         cmd.out = -1;
 615
 616         /*
 617          * rev-list may have died by encountering a bad commit
 618          * in the history, in which case we do want to bail out
 619          * even when it showed no commit.
 620          */
 621         if (finish_command(&cmd))
 622                 goto error;
 623
 624         /* All the non-tip ones are ancestors of what we advertised */
 625         return 0;
 626
 627 error:
 628         sigchain_pop(SIGPIPE);
 629         if (cmd.out >= 0)
 630                 close(cmd.out);
 631         return 1;
 632 }
 633
 634 static void check_non_tip(void)
 635 {
 636         int i;
 637
 638         /*
 639          * In the normal in-process case without
 640          * uploadpack.allowReachableSHA1InWant,
 641          * non-tip requests can never happen.
 642          */
 643         if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 644                 goto error;
 645         if (!has_unreachable(&want_obj))
 646                 /* All the non-tip ones are ancestors of what we advertised */
 647                 return;
 648
 649 error:
 650         /* Pick one of them (we know there at least is one) */
 651         for (i = 0; i < want_obj.nr; i++) {
 652                 struct object *o = want_obj.objects[i].item;
 653                 if (!is_our_ref(o))
 654                         die("git upload-pack: not our ref %s",
 655                             oid_to_hex(&o->oid));
 656         }
 657 }
 658
 659 static void send_shallow(struct commit_list *result)
 660 {
 661         while (result) {
 662                 struct object *object = &result->item->object;
 663                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 664                         packet_write_fmt(1, "shallow %s",
 665                                          oid_to_hex(&object->oid));
 666                         register_shallow(the_repository, &object->oid);
 667                         shallow_nr++;
 668                 }
 669                 result = result->next;
 670         }
 671 }
 672
 673 static void send_unshallow(const struct object_array *shallows)
 674 {
 675         int i;
 676
 677         for (i = 0; i < shallows->nr; i++) {
 678                 struct object *object = shallows->objects[i].item;
 679                 if (object->flags & NOT_SHALLOW) {
 680                         struct commit_list *parents;
 681                         packet_write_fmt(1, "unshallow %s",
 682                                          oid_to_hex(&object->oid));
 683                         object->flags &= ~CLIENT_SHALLOW;
 684                         /*
 685                          * We want to _register_ "object" as shallow, but we
 686                          * also need to traverse object's parents to deepen a
 687                          * shallow clone. Unregister it for now so we can
 688                          * parse and add the parents to the want list, then
 689                          * re-register it.
 690                          */
 691                         unregister_shallow(&object->oid);
 692                         object->parsed = 0;
 693                         parse_commit_or_die((struct commit *)object);
 694                         parents = ((struct commit *)object)->parents;
 695                         while (parents) {
 696                                 add_object_array(&parents->item->object,
 697                                                  NULL, &want_obj);
 698                                 parents = parents->next;
 699                         }
 700                         add_object_array(object, NULL, &extra_edge_obj);
 701                 }
 702                 /* make sure commit traversal conforms to client */
 703                 register_shallow(the_repository, &object->oid);
 704         }
 705 }
 706
 707 static void deepen(int depth, int deepen_relative,
 708                    struct object_array *shallows)
 709 {
 710         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 711                 int i;
 712
 713                 for (i = 0; i < shallows->nr; i++) {
 714                         struct object *object = shallows->objects[i].item;
 715                         object->flags |= NOT_SHALLOW;
 716                 }
 717         } else if (deepen_relative) {
 718                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 719                 struct commit_list *result;
 720
 721                 get_reachable_list(shallows, &reachable_shallows);
 722                 result = get_shallow_commits(&reachable_shallows,
 723                                              depth + 1,
 724                                              SHALLOW, NOT_SHALLOW);
 725                 send_shallow(result);
 726                 free_commit_list(result);
 727                 object_array_clear(&reachable_shallows);
 728         } else {
 729                 struct commit_list *result;
 730
 731                 result = get_shallow_commits(&want_obj, depth,
 732                                              SHALLOW, NOT_SHALLOW);
 733                 send_shallow(result);
 734                 free_commit_list(result);
 735         }
 736
 737         send_unshallow(shallows);
 738         packet_flush(1);
 739 }
 740
 741 static void deepen_by_rev_list(int ac, const char **av,
 742                                struct object_array *shallows)
 743 {
 744         struct commit_list *result;
 745
 746         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 747         send_shallow(result);
 748         free_commit_list(result);
 749         send_unshallow(shallows);
 750         packet_flush(1);
 751 }
 752
 753 static void receive_needs(void)
 754 {
 755         struct object_array shallows = OBJECT_ARRAY_INIT;
 756         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 757         int depth = 0;
 758         int has_non_tip = 0;
 759         timestamp_t deepen_since = 0;
 760         int deepen_rev_list = 0;
 761
 762         shallow_nr = 0;
 763         for (;;) {
 764                 struct object *o;
 765                 const char *features;
 766                 struct object_id oid_buf;
 767                 char *line = packet_read_line(0, NULL);
 768                 const char *arg;
 769
 770                 reset_timeout();
 771                 if (!line)
 772                         break;
 773
 774                 if (skip_prefix(line, "shallow ", &arg)) {
 775                         struct object_id oid;
 776                         struct object *object;
 777                         if (get_oid_hex(arg, &oid))
 778                                 die("invalid shallow line: %s", line);
 779                         object = parse_object(&oid);
 780                         if (!object)
 781                                 continue;
 782                         if (object->type != OBJ_COMMIT)
 783                                 die("invalid shallow object %s", oid_to_hex(&oid));
 784                         if (!(object->flags & CLIENT_SHALLOW)) {
 785                                 object->flags |= CLIENT_SHALLOW;
 786                                 add_object_array(object, NULL, &shallows);
 787                         }
 788                         continue;
 789                 }
 790                 if (skip_prefix(line, "deepen ", &arg)) {
 791                         char *end = NULL;
 792                         depth = strtol(arg, &end, 0);
 793                         if (!end || *end || depth <= 0)
 794                                 die("Invalid deepen: %s", line);
 795                         continue;
 796                 }
 797                 if (skip_prefix(line, "deepen-since ", &arg)) {
 798                         char *end = NULL;
 799                         deepen_since = parse_timestamp(arg, &end, 0);
 800                         if (!end || *end || !deepen_since ||
 801                             /* revisions.c's max_age -1 is special */
 802                             deepen_since == -1)
 803                                 die("Invalid deepen-since: %s", line);
 804                         deepen_rev_list = 1;
 805                         continue;
 806                 }
 807                 if (skip_prefix(line, "deepen-not ", &arg)) {
 808                         char *ref = NULL;
 809                         struct object_id oid;
 810                         if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 811                                 die("git upload-pack: ambiguous deepen-not: %s", line);
 812                         string_list_append(&deepen_not, ref);
 813                         free(ref);
 814                         deepen_rev_list = 1;
 815                         continue;
 816                 }
 817                 if (skip_prefix(line, "filter ", &arg)) {
 818                         if (!filter_capability_requested)
 819                                 die("git upload-pack: filtering capability not negotiated");
 820                         parse_list_objects_filter(&filter_options, arg);
 821                         continue;
 822                 }
 823                 if (!skip_prefix(line, "want ", &arg) ||
 824                     get_oid_hex(arg, &oid_buf))
 825                         die("git upload-pack: protocol error, "
 826                             "expected to get sha, not '%s'", line);
 827
 828                 features = arg + 40;
 829
 830                 if (parse_feature_request(features, "deepen-relative"))
 831                         deepen_relative = 1;
 832                 if (parse_feature_request(features, "multi_ack_detailed"))
 833                         multi_ack = 2;
 834                 else if (parse_feature_request(features, "multi_ack"))
 835                         multi_ack = 1;
 836                 if (parse_feature_request(features, "no-done"))
 837                         no_done = 1;
 838                 if (parse_feature_request(features, "thin-pack"))
 839                         use_thin_pack = 1;
 840                 if (parse_feature_request(features, "ofs-delta"))
 841                         use_ofs_delta = 1;
 842                 if (parse_feature_request(features, "side-band-64k"))
 843                         use_sideband = LARGE_PACKET_MAX;
 844                 else if (parse_feature_request(features, "side-band"))
 845                         use_sideband = DEFAULT_PACKET_MAX;
 846                 if (parse_feature_request(features, "no-progress"))
 847                         no_progress = 1;
 848                 if (parse_feature_request(features, "include-tag"))
 849                         use_include_tag = 1;
 850                 if (allow_filter && parse_feature_request(features, "filter"))
 851                         filter_capability_requested = 1;
 852
 853                 o = parse_object(&oid_buf);
 854                 if (!o) {
 855                         packet_write_fmt(1,
 856                                          "ERR upload-pack: not our ref %s",
 857                                          oid_to_hex(&oid_buf));
 858                         die("git upload-pack: not our ref %s",
 859                             oid_to_hex(&oid_buf));
 860                 }
 861                 if (!(o->flags & WANTED)) {
 862                         o->flags |= WANTED;
 863                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 864                               || is_our_ref(o)))
 865                                 has_non_tip = 1;
 866                         add_object_array(o, NULL, &want_obj);
 867                 }
 868         }
 869
 870         /*
 871          * We have sent all our refs already, and the other end
 872          * should have chosen out of them. When we are operating
 873          * in the stateless RPC mode, however, their choice may
 874          * have been based on the set of older refs advertised
 875          * by another process that handled the initial request.
 876          */
 877         if (has_non_tip)
 878                 check_non_tip();
 879
 880         if (!use_sideband && daemon_mode)
 881                 no_progress = 1;
 882
 883         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 884                 return;
 885         if (depth > 0 && deepen_rev_list)
 886                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 887         if (depth > 0)
 888                 deepen(depth, deepen_relative, &shallows);
 889         else if (deepen_rev_list) {
 890                 struct argv_array av = ARGV_ARRAY_INIT;
 891                 int i;
 892
 893                 argv_array_push(&av, "rev-list");
 894                 if (deepen_since)
 895                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 896                 if (deepen_not.nr) {
 897                         argv_array_push(&av, "--not");
 898                         for (i = 0; i < deepen_not.nr; i++) {
 899                                 struct string_list_item *s = deepen_not.items + i;
 900                                 argv_array_push(&av, s->string);
 901                         }
 902                         argv_array_push(&av, "--not");
 903                 }
 904                 for (i = 0; i < want_obj.nr; i++) {
 905                         struct object *o = want_obj.objects[i].item;
 906                         argv_array_push(&av, oid_to_hex(&o->oid));
 907                 }
 908                 deepen_by_rev_list(av.argc, av.argv, &shallows);
 909                 argv_array_clear(&av);
 910         }
 911         else
 912                 if (shallows.nr > 0) {
 913                         int i;
 914                         for (i = 0; i < shallows.nr; i++)
 915                                 register_shallow(the_repository,
 916                                                  &shallows.objects[i].item->oid);
 917                 }
 918
 919         shallow_nr += shallows.nr;
 920         object_array_clear(&shallows);
 921 }
 922
 923 /* return non-zero if the ref is hidden, otherwise 0 */
 924 static int mark_our_ref(const char *refname, const char *refname_full,
 925                         const struct object_id *oid)
 926 {
 927         struct object *o = lookup_unknown_object(oid->hash);
 928
 929         if (ref_is_hidden(refname, refname_full)) {
 930                 o->flags |= HIDDEN_REF;
 931                 return 1;
 932         }
 933         o->flags |= OUR_REF;
 934         return 0;
 935 }
 936
 937 static int check_ref(const char *refname_full, const struct object_id *oid,
 938                      int flag, void *cb_data)
 939 {
 940         const char *refname = strip_namespace(refname_full);
 941
 942         mark_our_ref(refname, refname_full, oid);
 943         return 0;
 944 }
 945
 946 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 947 {
 948         struct string_list_item *item;
 949
 950         if (!symref->nr)
 951                 return;
 952         for_each_string_list_item(item, symref)
 953                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 954 }
 955
 956 static int send_ref(const char *refname, const struct object_id *oid,
 957                     int flag, void *cb_data)
 958 {
 959         static const char *capabilities = "multi_ack thin-pack side-band"
 960                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
 961                 " deepen-relative no-progress include-tag multi_ack_detailed";
 962         const char *refname_nons = strip_namespace(refname);
 963         struct object_id peeled;
 964
 965         if (mark_our_ref(refname_nons, refname, oid))
 966                 return 0;
 967
 968         if (capabilities) {
 969                 struct strbuf symref_info = STRBUF_INIT;
 970
 971                 format_symref_info(&symref_info, cb_data);
 972                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
 973                              oid_to_hex(oid), refname_nons,
 974                              0, capabilities,
 975                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
 976                                      " allow-tip-sha1-in-want" : "",
 977                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
 978                                      " allow-reachable-sha1-in-want" : "",
 979                              stateless_rpc ? " no-done" : "",
 980                              symref_info.buf,
 981                              allow_filter ? " filter" : "",
 982                              git_user_agent_sanitized());
 983                 strbuf_release(&symref_info);
 984         } else {
 985                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 986         }
 987         capabilities = NULL;
 988         if (!peel_ref(refname, &peeled))
 989                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 990         return 0;
 991 }
 992
 993 static int find_symref(const char *refname, const struct object_id *oid,
 994                        int flag, void *cb_data)
 995 {
 996         const char *symref_target;
 997         struct string_list_item *item;
 998
 999         if ((flag & REF_ISSYMREF) == 0)
1000                 return 0;
1001         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1002         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1003                 die("'%s' is a symref but it is not?", refname);
1004         item = string_list_append(cb_data, refname);
1005         item->util = xstrdup(symref_target);
1006         return 0;
1007 }
1008
1009 static void upload_pack(void)
1010 {
1011         struct string_list symref = STRING_LIST_INIT_DUP;
1012
1013         head_ref_namespaced(find_symref, &symref);
1014
1015         if (advertise_refs || !stateless_rpc) {
1016                 reset_timeout();
1017                 head_ref_namespaced(send_ref, &symref);
1018                 for_each_namespaced_ref(send_ref, &symref);
1019                 advertise_shallow_grafts(1);
1020                 packet_flush(1);
1021         } else {
1022                 head_ref_namespaced(check_ref, NULL);
1023                 for_each_namespaced_ref(check_ref, NULL);
1024         }
1025         string_list_clear(&symref, 1);
1026         if (advertise_refs)
1027                 return;
1028
1029         receive_needs();
1030         if (want_obj.nr) {
1031                 get_common_commits();
1032                 create_pack_file();
1033         }
1034 }
1035
1036 static int upload_pack_config(const char *var, const char *value, void *unused)
1037 {
1038         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1039                 if (git_config_bool(var, value))
1040                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1041                 else
1042                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1043         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1044                 if (git_config_bool(var, value))
1045                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1046                 else
1047                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1048         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1049                 if (git_config_bool(var, value))
1050                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1051                 else
1052                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1053         } else if (!strcmp("uploadpack.keepalive", var)) {
1054                 keepalive = git_config_int(var, value);
1055                 if (!keepalive)
1056                         keepalive = -1;
1057         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1058                 if (!strcmp("uploadpack.packobjectshook", var))
1059                         return git_config_string(&pack_objects_hook, var, value);
1060         } else if (!strcmp("uploadpack.allowfilter", var)) {
1061                 allow_filter = git_config_bool(var, value);
1062         }
1063         return parse_hide_refs_config(var, value, "uploadpack");
1064 }
1065
1066 int cmd_main(int argc, const char **argv)
1067 {
1068         const char *dir;
1069         int strict = 0;
1070         struct option options[] = {
1071                 OPT_BOOL(0, "stateless-rpc", &stateless_rpc,
1072                          N_("quit after a single request/response exchange")),
1073                 OPT_BOOL(0, "advertise-refs", &advertise_refs,
1074                          N_("exit immediately after initial ref advertisement")),
1075                 OPT_BOOL(0, "strict", &strict,
1076                          N_("do not try <directory>/.git/ if <directory> is no Git directory")),
1077                 OPT_INTEGER(0, "timeout", &timeout,
1078                             N_("interrupt transfer after <n> seconds of inactivity")),
1079                 OPT_END()
1080         };
1081
1082         packet_trace_identity("upload-pack");
1083         check_replace_refs = 0;
1084
1085         argc = parse_options(argc, argv, NULL, options, upload_pack_usage, 0);
1086
1087         if (argc != 1)
1088                 usage_with_options(upload_pack_usage, options);
1089
1090         if (timeout)
1091                 daemon_mode = 1;
1092
1093         setup_path();
1094
1095         dir = argv[0];
1096
1097         if (!enter_repo(dir, strict))
1098                 die("'%s' does not appear to be a git repository", dir);
1099
1100         git_config(upload_pack_config, NULL);
1101
1102         switch (determine_protocol_version_server()) {
1103         case protocol_v1:
1104                 /*
1105                  * v1 is just the original protocol with a version string,
1106                  * so just fall through after writing the version string.
1107                  */
1108                 if (advertise_refs || !stateless_rpc)
1109                         packet_write_fmt(1, "version 1\n");
1110
1111                 /* fallthrough */
1112         case protocol_v0:
1113                 upload_pack();
1114                 break;
1115         case protocol_unknown_version:
1116                 BUG("unknown protocol version");
1117         }
1118
1119         return 0;
1120 }