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 "repository.h"
   7 #include "object-store.h"
   8 #include "tag.h"
   9 #include "object.h"
  10 #include "commit.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 "argv-array.h"
  22 #include "prio-queue.h"
  23 #include "protocol.h"
  24 #include "quote.h"
  25 #include "upload-pack.h"
  26 #include "serve.h"
  27
  28 /* Remember to update object flag allocation in object.h */
  29 #define THEY_HAVE       (1u << 11)
  30 #define OUR_REF         (1u << 12)
  31 #define WANTED          (1u << 13)
  32 #define COMMON_KNOWN    (1u << 14)
  33 #define REACHABLE       (1u << 15)
  34
  35 #define SHALLOW         (1u << 16)
  36 #define NOT_SHALLOW     (1u << 17)
  37 #define CLIENT_SHALLOW  (1u << 18)
  38 #define HIDDEN_REF      (1u << 19)
  39
  40 static timestamp_t oldest_have;
  41
  42 static int deepen_relative;
  43 static int multi_ack;
  44 static int no_done;
  45 static int use_thin_pack, use_ofs_delta, use_include_tag;
  46 static int no_progress, daemon_mode;
  47 /* Allow specifying sha1 if it is a ref tip. */
  48 #define ALLOW_TIP_SHA1  01
  49 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  50 #define ALLOW_REACHABLE_SHA1    02
  51 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  52 #define ALLOW_ANY_SHA1  07
  53 static unsigned int allow_unadvertised_object_request;
  54 static int shallow_nr;
  55 static struct object_array have_obj;
  56 static struct object_array want_obj;
  57 static struct object_array extra_edge_obj;
  58 static unsigned int timeout;
  59 static int keepalive = 5;
  60 /* 0 for no sideband,
  61  * otherwise maximum packet size (up to 65520 bytes).
  62  */
  63 static int use_sideband;
  64 static int stateless_rpc;
  65 static const char *pack_objects_hook;
  66
  67 static int filter_capability_requested;
  68 static int allow_filter;
  69 static int allow_ref_in_want;
  70 static struct list_objects_filter_options filter_options;
  71
  72 static void reset_timeout(void)
  73 {
  74         alarm(timeout);
  75 }
  76
  77 static void send_client_data(int fd, const char *data, ssize_t sz)
  78 {
  79         if (use_sideband) {
  80                 send_sideband(1, fd, data, sz, use_sideband);
  81                 return;
  82         }
  83         if (fd == 3)
  84                 /* emergency quit */
  85                 fd = 2;
  86         if (fd == 2) {
  87                 /* XXX: are we happy to lose stuff here? */
  88                 xwrite(fd, data, sz);
  89                 return;
  90         }
  91         write_or_die(fd, data, sz);
  92 }
  93
  94 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
  95 {
  96         FILE *fp = cb_data;
  97         if (graft->nr_parent == -1)
  98                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
  99         return 0;
 100 }
 101
 102 static void create_pack_file(void)
 103 {
 104         struct child_process pack_objects = CHILD_PROCESS_INIT;
 105         char data[8193], progress[128];
 106         char abort_msg[] = "aborting due to possible repository "
 107                 "corruption on the remote side.";
 108         int buffered = -1;
 109         ssize_t sz;
 110         int i;
 111         FILE *pipe_fd;
 112
 113         if (!pack_objects_hook)
 114                 pack_objects.git_cmd = 1;
 115         else {
 116                 argv_array_push(&pack_objects.args, pack_objects_hook);
 117                 argv_array_push(&pack_objects.args, "git");
 118                 pack_objects.use_shell = 1;
 119         }
 120
 121         if (shallow_nr) {
 122                 argv_array_push(&pack_objects.args, "--shallow-file");
 123                 argv_array_push(&pack_objects.args, "");
 124         }
 125         argv_array_push(&pack_objects.args, "pack-objects");
 126         argv_array_push(&pack_objects.args, "--revs");
 127         if (use_thin_pack)
 128                 argv_array_push(&pack_objects.args, "--thin");
 129
 130         argv_array_push(&pack_objects.args, "--stdout");
 131         if (shallow_nr)
 132                 argv_array_push(&pack_objects.args, "--shallow");
 133         if (!no_progress)
 134                 argv_array_push(&pack_objects.args, "--progress");
 135         if (use_ofs_delta)
 136                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 137         if (use_include_tag)
 138                 argv_array_push(&pack_objects.args, "--include-tag");
 139         if (filter_options.filter_spec) {
 140                 if (pack_objects.use_shell) {
 141                         struct strbuf buf = STRBUF_INIT;
 142                         sq_quote_buf(&buf, filter_options.filter_spec);
 143                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 144                         strbuf_release(&buf);
 145                 } else {
 146                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 147                                          filter_options.filter_spec);
 148                 }
 149         }
 150
 151         pack_objects.in = -1;
 152         pack_objects.out = -1;
 153         pack_objects.err = -1;
 154
 155         if (start_command(&pack_objects))
 156                 die("git upload-pack: unable to fork git-pack-objects");
 157
 158         pipe_fd = xfdopen(pack_objects.in, "w");
 159
 160         if (shallow_nr)
 161                 for_each_commit_graft(write_one_shallow, pipe_fd);
 162
 163         for (i = 0; i < want_obj.nr; i++)
 164                 fprintf(pipe_fd, "%s\n",
 165                         oid_to_hex(&want_obj.objects[i].item->oid));
 166         fprintf(pipe_fd, "--not\n");
 167         for (i = 0; i < have_obj.nr; i++)
 168                 fprintf(pipe_fd, "%s\n",
 169                         oid_to_hex(&have_obj.objects[i].item->oid));
 170         for (i = 0; i < extra_edge_obj.nr; i++)
 171                 fprintf(pipe_fd, "%s\n",
 172                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 173         fprintf(pipe_fd, "\n");
 174         fflush(pipe_fd);
 175         fclose(pipe_fd);
 176
 177         /* We read from pack_objects.err to capture stderr output for
 178          * progress bar, and pack_objects.out to capture the pack data.
 179          */
 180
 181         while (1) {
 182                 struct pollfd pfd[2];
 183                 int pe, pu, pollsize;
 184                 int ret;
 185
 186                 reset_timeout();
 187
 188                 pollsize = 0;
 189                 pe = pu = -1;
 190
 191                 if (0 <= pack_objects.out) {
 192                         pfd[pollsize].fd = pack_objects.out;
 193                         pfd[pollsize].events = POLLIN;
 194                         pu = pollsize;
 195                         pollsize++;
 196                 }
 197                 if (0 <= pack_objects.err) {
 198                         pfd[pollsize].fd = pack_objects.err;
 199                         pfd[pollsize].events = POLLIN;
 200                         pe = pollsize;
 201                         pollsize++;
 202                 }
 203
 204                 if (!pollsize)
 205                         break;
 206
 207                 ret = poll(pfd, pollsize,
 208                         keepalive < 0 ? -1 : 1000 * keepalive);
 209
 210                 if (ret < 0) {
 211                         if (errno != EINTR) {
 212                                 error_errno("poll failed, resuming");
 213                                 sleep(1);
 214                         }
 215                         continue;
 216                 }
 217                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 218                         /* Status ready; we ship that in the side-band
 219                          * or dump to the standard error.
 220                          */
 221                         sz = xread(pack_objects.err, progress,
 222                                   sizeof(progress));
 223                         if (0 < sz)
 224                                 send_client_data(2, progress, sz);
 225                         else if (sz == 0) {
 226                                 close(pack_objects.err);
 227                                 pack_objects.err = -1;
 228                         }
 229                         else
 230                                 goto fail;
 231                         /* give priority to status messages */
 232                         continue;
 233                 }
 234                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 235                         /* Data ready; we keep the last byte to ourselves
 236                          * in case we detect broken rev-list, so that we
 237                          * can leave the stream corrupted.  This is
 238                          * unfortunate -- unpack-objects would happily
 239                          * accept a valid packdata with trailing garbage,
 240                          * so appending garbage after we pass all the
 241                          * pack data is not good enough to signal
 242                          * breakage to downstream.
 243                          */
 244                         char *cp = data;
 245                         ssize_t outsz = 0;
 246                         if (0 <= buffered) {
 247                                 *cp++ = buffered;
 248                                 outsz++;
 249                         }
 250                         sz = xread(pack_objects.out, cp,
 251                                   sizeof(data) - outsz);
 252                         if (0 < sz)
 253                                 ;
 254                         else if (sz == 0) {
 255                                 close(pack_objects.out);
 256                                 pack_objects.out = -1;
 257                         }
 258                         else
 259                                 goto fail;
 260                         sz += outsz;
 261                         if (1 < sz) {
 262                                 buffered = data[sz-1] & 0xFF;
 263                                 sz--;
 264                         }
 265                         else
 266                                 buffered = -1;
 267                         send_client_data(1, data, sz);
 268                 }
 269
 270                 /*
 271                  * We hit the keepalive timeout without saying anything; send
 272                  * an empty message on the data sideband just to let the other
 273                  * side know we're still working on it, but don't have any data
 274                  * yet.
 275                  *
 276                  * If we don't have a sideband channel, there's no room in the
 277                  * protocol to say anything, so those clients are just out of
 278                  * luck.
 279                  */
 280                 if (!ret && use_sideband) {
 281                         static const char buf[] = "0005\1";
 282                         write_or_die(1, buf, 5);
 283                 }
 284         }
 285
 286         if (finish_command(&pack_objects)) {
 287                 error("git upload-pack: git-pack-objects died with error.");
 288                 goto fail;
 289         }
 290
 291         /* flush the data */
 292         if (0 <= buffered) {
 293                 data[0] = buffered;
 294                 send_client_data(1, data, 1);
 295                 fprintf(stderr, "flushed.\n");
 296         }
 297         if (use_sideband)
 298                 packet_flush(1);
 299         return;
 300
 301  fail:
 302         send_client_data(3, abort_msg, sizeof(abort_msg));
 303         die("git upload-pack: %s", abort_msg);
 304 }
 305
 306 static int got_oid(const char *hex, struct object_id *oid)
 307 {
 308         struct object *o;
 309         int we_knew_they_have = 0;
 310
 311         if (get_oid_hex(hex, oid))
 312                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 313         if (!has_object_file(oid))
 314                 return -1;
 315
 316         o = parse_object(the_repository, oid);
 317         if (!o)
 318                 die("oops (%s)", oid_to_hex(oid));
 319         if (o->type == OBJ_COMMIT) {
 320                 struct commit_list *parents;
 321                 struct commit *commit = (struct commit *)o;
 322                 if (o->flags & THEY_HAVE)
 323                         we_knew_they_have = 1;
 324                 else
 325                         o->flags |= THEY_HAVE;
 326                 if (!oldest_have || (commit->date < oldest_have))
 327                         oldest_have = commit->date;
 328                 for (parents = commit->parents;
 329                      parents;
 330                      parents = parents->next)
 331                         parents->item->object.flags |= THEY_HAVE;
 332         }
 333         if (!we_knew_they_have) {
 334                 add_object_array(o, NULL, &have_obj);
 335                 return 1;
 336         }
 337         return 0;
 338 }
 339
 340 static int reachable(struct commit *want)
 341 {
 342         struct prio_queue work = { compare_commits_by_commit_date };
 343
 344         prio_queue_put(&work, want);
 345         while (work.nr) {
 346                 struct commit_list *list;
 347                 struct commit *commit = prio_queue_get(&work);
 348
 349                 if (commit->object.flags & THEY_HAVE) {
 350                         want->object.flags |= COMMON_KNOWN;
 351                         break;
 352                 }
 353                 if (!commit->object.parsed)
 354                         parse_object(the_repository, &commit->object.oid);
 355                 if (commit->object.flags & REACHABLE)
 356                         continue;
 357                 commit->object.flags |= REACHABLE;
 358                 if (commit->date < oldest_have)
 359                         continue;
 360                 for (list = commit->parents; list; list = list->next) {
 361                         struct commit *parent = list->item;
 362                         if (!(parent->object.flags & REACHABLE))
 363                                 prio_queue_put(&work, parent);
 364                 }
 365         }
 366         want->object.flags |= REACHABLE;
 367         clear_commit_marks(want, REACHABLE);
 368         clear_prio_queue(&work);
 369         return (want->object.flags & COMMON_KNOWN);
 370 }
 371
 372 static int ok_to_give_up(void)
 373 {
 374         int i;
 375
 376         if (!have_obj.nr)
 377                 return 0;
 378
 379         for (i = 0; i < want_obj.nr; i++) {
 380                 struct object *want = want_obj.objects[i].item;
 381
 382                 if (want->flags & COMMON_KNOWN)
 383                         continue;
 384                 want = deref_tag(the_repository, want, "a want line", 0);
 385                 if (!want || want->type != OBJ_COMMIT) {
 386                         /* no way to tell if this is reachable by
 387                          * looking at the ancestry chain alone, so
 388                          * leave a note to ourselves not to worry about
 389                          * this object anymore.
 390                          */
 391                         want_obj.objects[i].item->flags |= COMMON_KNOWN;
 392                         continue;
 393                 }
 394                 if (!reachable((struct commit *)want))
 395                         return 0;
 396         }
 397         return 1;
 398 }
 399
 400 static int get_common_commits(void)
 401 {
 402         struct object_id oid;
 403         char last_hex[GIT_MAX_HEXSZ + 1];
 404         int got_common = 0;
 405         int got_other = 0;
 406         int sent_ready = 0;
 407
 408         save_commit_buffer = 0;
 409
 410         for (;;) {
 411                 char *line = packet_read_line(0, NULL);
 412                 const char *arg;
 413
 414                 reset_timeout();
 415
 416                 if (!line) {
 417                         if (multi_ack == 2 && got_common
 418                             && !got_other && ok_to_give_up()) {
 419                                 sent_ready = 1;
 420                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 421                         }
 422                         if (have_obj.nr == 0 || multi_ack)
 423                                 packet_write_fmt(1, "NAK\n");
 424
 425                         if (no_done && sent_ready) {
 426                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 427                                 return 0;
 428                         }
 429                         if (stateless_rpc)
 430                                 exit(0);
 431                         got_common = 0;
 432                         got_other = 0;
 433                         continue;
 434                 }
 435                 if (skip_prefix(line, "have ", &arg)) {
 436                         switch (got_oid(arg, &oid)) {
 437                         case -1: /* they have what we do not */
 438                                 got_other = 1;
 439                                 if (multi_ack && ok_to_give_up()) {
 440                                         const char *hex = oid_to_hex(&oid);
 441                                         if (multi_ack == 2) {
 442                                                 sent_ready = 1;
 443                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 444                                         } else
 445                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 446                                 }
 447                                 break;
 448                         default:
 449                                 got_common = 1;
 450                                 oid_to_hex_r(last_hex, &oid);
 451                                 if (multi_ack == 2)
 452                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 453                                 else if (multi_ack)
 454                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 455                                 else if (have_obj.nr == 1)
 456                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 457                                 break;
 458                         }
 459                         continue;
 460                 }
 461                 if (!strcmp(line, "done")) {
 462                         if (have_obj.nr > 0) {
 463                                 if (multi_ack)
 464                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 465                                 return 0;
 466                         }
 467                         packet_write_fmt(1, "NAK\n");
 468                         return -1;
 469                 }
 470                 die("git upload-pack: expected SHA1 list, got '%s'", line);
 471         }
 472 }
 473
 474 static int is_our_ref(struct object *o)
 475 {
 476         int allow_hidden_ref = (allow_unadvertised_object_request &
 477                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 478         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 479 }
 480
 481 /*
 482  * on successful case, it's up to the caller to close cmd->out
 483  */
 484 static int do_reachable_revlist(struct child_process *cmd,
 485                                 struct object_array *src,
 486                                 struct object_array *reachable)
 487 {
 488         static const char *argv[] = {
 489                 "rev-list", "--stdin", NULL,
 490         };
 491         struct object *o;
 492         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 493         int i;
 494
 495         cmd->argv = argv;
 496         cmd->git_cmd = 1;
 497         cmd->no_stderr = 1;
 498         cmd->in = -1;
 499         cmd->out = -1;
 500
 501         /*
 502          * If the next rev-list --stdin encounters an unknown commit,
 503          * it terminates, which will cause SIGPIPE in the write loop
 504          * below.
 505          */
 506         sigchain_push(SIGPIPE, SIG_IGN);
 507
 508         if (start_command(cmd))
 509                 goto error;
 510
 511         namebuf[0] = '^';
 512         namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
 513         for (i = get_max_object_index(); 0 < i; ) {
 514                 o = get_indexed_object(--i);
 515                 if (!o)
 516                         continue;
 517                 if (reachable && o->type == OBJ_COMMIT)
 518                         o->flags &= ~TMP_MARK;
 519                 if (!is_our_ref(o))
 520                         continue;
 521                 memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 522                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
 523                         goto error;
 524         }
 525         namebuf[GIT_SHA1_HEXSZ] = '\n';
 526         for (i = 0; i < src->nr; i++) {
 527                 o = src->objects[i].item;
 528                 if (is_our_ref(o)) {
 529                         if (reachable)
 530                                 add_object_array(o, NULL, reachable);
 531                         continue;
 532                 }
 533                 if (reachable && o->type == OBJ_COMMIT)
 534                         o->flags |= TMP_MARK;
 535                 memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 536                 if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
 537                         goto error;
 538         }
 539         close(cmd->in);
 540         cmd->in = -1;
 541         sigchain_pop(SIGPIPE);
 542
 543         return 0;
 544
 545 error:
 546         sigchain_pop(SIGPIPE);
 547
 548         if (cmd->in >= 0)
 549                 close(cmd->in);
 550         if (cmd->out >= 0)
 551                 close(cmd->out);
 552         return -1;
 553 }
 554
 555 static int get_reachable_list(struct object_array *src,
 556                               struct object_array *reachable)
 557 {
 558         struct child_process cmd = CHILD_PROCESS_INIT;
 559         int i;
 560         struct object *o;
 561         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 562         const unsigned hexsz = the_hash_algo->hexsz;
 563
 564         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 565                 return -1;
 566
 567         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 568                 struct object_id sha1;
 569                 const char *p;
 570
 571                 if (parse_oid_hex(namebuf, &sha1, &p) || *p != '\n')
 572                         break;
 573
 574                 o = lookup_object(the_repository, 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(the_repository, &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(the_repository, &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(the_repository)) {
 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 }
 737
 738 static void deepen_by_rev_list(int ac, const char **av,
 739                                struct object_array *shallows)
 740 {
 741         struct commit_list *result;
 742
 743         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 744         send_shallow(result);
 745         free_commit_list(result);
 746         send_unshallow(shallows);
 747 }
 748
 749 /* Returns 1 if a shallow list is sent or 0 otherwise */
 750 static int send_shallow_list(int depth, int deepen_rev_list,
 751                              timestamp_t deepen_since,
 752                              struct string_list *deepen_not,
 753                              struct object_array *shallows)
 754 {
 755         int ret = 0;
 756
 757         if (depth > 0 && deepen_rev_list)
 758                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 759         if (depth > 0) {
 760                 deepen(depth, deepen_relative, shallows);
 761                 ret = 1;
 762         } else if (deepen_rev_list) {
 763                 struct argv_array av = ARGV_ARRAY_INIT;
 764                 int i;
 765
 766                 argv_array_push(&av, "rev-list");
 767                 if (deepen_since)
 768                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 769                 if (deepen_not->nr) {
 770                         argv_array_push(&av, "--not");
 771                         for (i = 0; i < deepen_not->nr; i++) {
 772                                 struct string_list_item *s = deepen_not->items + i;
 773                                 argv_array_push(&av, s->string);
 774                         }
 775                         argv_array_push(&av, "--not");
 776                 }
 777                 for (i = 0; i < want_obj.nr; i++) {
 778                         struct object *o = want_obj.objects[i].item;
 779                         argv_array_push(&av, oid_to_hex(&o->oid));
 780                 }
 781                 deepen_by_rev_list(av.argc, av.argv, shallows);
 782                 argv_array_clear(&av);
 783                 ret = 1;
 784         } else {
 785                 if (shallows->nr > 0) {
 786                         int i;
 787                         for (i = 0; i < shallows->nr; i++)
 788                                 register_shallow(the_repository,
 789                                                  &shallows->objects[i].item->oid);
 790                 }
 791         }
 792
 793         shallow_nr += shallows->nr;
 794         return ret;
 795 }
 796
 797 static int process_shallow(const char *line, struct object_array *shallows)
 798 {
 799         const char *arg;
 800         if (skip_prefix(line, "shallow ", &arg)) {
 801                 struct object_id oid;
 802                 struct object *object;
 803                 if (get_oid_hex(arg, &oid))
 804                         die("invalid shallow line: %s", line);
 805                 object = parse_object(the_repository, &oid);
 806                 if (!object)
 807                         return 1;
 808                 if (object->type != OBJ_COMMIT)
 809                         die("invalid shallow object %s", oid_to_hex(&oid));
 810                 if (!(object->flags & CLIENT_SHALLOW)) {
 811                         object->flags |= CLIENT_SHALLOW;
 812                         add_object_array(object, NULL, shallows);
 813                 }
 814                 return 1;
 815         }
 816
 817         return 0;
 818 }
 819
 820 static int process_deepen(const char *line, int *depth)
 821 {
 822         const char *arg;
 823         if (skip_prefix(line, "deepen ", &arg)) {
 824                 char *end = NULL;
 825                 *depth = (int)strtol(arg, &end, 0);
 826                 if (!end || *end || *depth <= 0)
 827                         die("Invalid deepen: %s", line);
 828                 return 1;
 829         }
 830
 831         return 0;
 832 }
 833
 834 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 835 {
 836         const char *arg;
 837         if (skip_prefix(line, "deepen-since ", &arg)) {
 838                 char *end = NULL;
 839                 *deepen_since = parse_timestamp(arg, &end, 0);
 840                 if (!end || *end || !deepen_since ||
 841                     /* revisions.c's max_age -1 is special */
 842                     *deepen_since == -1)
 843                         die("Invalid deepen-since: %s", line);
 844                 *deepen_rev_list = 1;
 845                 return 1;
 846         }
 847         return 0;
 848 }
 849
 850 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 851 {
 852         const char *arg;
 853         if (skip_prefix(line, "deepen-not ", &arg)) {
 854                 char *ref = NULL;
 855                 struct object_id oid;
 856                 if (expand_ref(arg, strlen(arg), &oid, &ref) != 1)
 857                         die("git upload-pack: ambiguous deepen-not: %s", line);
 858                 string_list_append(deepen_not, ref);
 859                 free(ref);
 860                 *deepen_rev_list = 1;
 861                 return 1;
 862         }
 863         return 0;
 864 }
 865
 866 static void receive_needs(void)
 867 {
 868         struct object_array shallows = OBJECT_ARRAY_INIT;
 869         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 870         int depth = 0;
 871         int has_non_tip = 0;
 872         timestamp_t deepen_since = 0;
 873         int deepen_rev_list = 0;
 874
 875         shallow_nr = 0;
 876         for (;;) {
 877                 struct object *o;
 878                 const char *features;
 879                 struct object_id oid_buf;
 880                 char *line = packet_read_line(0, NULL);
 881                 const char *arg;
 882
 883                 reset_timeout();
 884                 if (!line)
 885                         break;
 886
 887                 if (process_shallow(line, &shallows))
 888                         continue;
 889                 if (process_deepen(line, &depth))
 890                         continue;
 891                 if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
 892                         continue;
 893                 if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
 894                         continue;
 895
 896                 if (skip_prefix(line, "filter ", &arg)) {
 897                         if (!filter_capability_requested)
 898                                 die("git upload-pack: filtering capability not negotiated");
 899                         parse_list_objects_filter(&filter_options, arg);
 900                         continue;
 901                 }
 902
 903                 if (!skip_prefix(line, "want ", &arg) ||
 904                     parse_oid_hex(arg, &oid_buf, &features))
 905                         die("git upload-pack: protocol error, "
 906                             "expected to get object ID, not '%s'", line);
 907
 908                 if (parse_feature_request(features, "deepen-relative"))
 909                         deepen_relative = 1;
 910                 if (parse_feature_request(features, "multi_ack_detailed"))
 911                         multi_ack = 2;
 912                 else if (parse_feature_request(features, "multi_ack"))
 913                         multi_ack = 1;
 914                 if (parse_feature_request(features, "no-done"))
 915                         no_done = 1;
 916                 if (parse_feature_request(features, "thin-pack"))
 917                         use_thin_pack = 1;
 918                 if (parse_feature_request(features, "ofs-delta"))
 919                         use_ofs_delta = 1;
 920                 if (parse_feature_request(features, "side-band-64k"))
 921                         use_sideband = LARGE_PACKET_MAX;
 922                 else if (parse_feature_request(features, "side-band"))
 923                         use_sideband = DEFAULT_PACKET_MAX;
 924                 if (parse_feature_request(features, "no-progress"))
 925                         no_progress = 1;
 926                 if (parse_feature_request(features, "include-tag"))
 927                         use_include_tag = 1;
 928                 if (allow_filter && parse_feature_request(features, "filter"))
 929                         filter_capability_requested = 1;
 930
 931                 o = parse_object(the_repository, &oid_buf);
 932                 if (!o) {
 933                         packet_write_fmt(1,
 934                                          "ERR upload-pack: not our ref %s",
 935                                          oid_to_hex(&oid_buf));
 936                         die("git upload-pack: not our ref %s",
 937                             oid_to_hex(&oid_buf));
 938                 }
 939                 if (!(o->flags & WANTED)) {
 940                         o->flags |= WANTED;
 941                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 942                               || is_our_ref(o)))
 943                                 has_non_tip = 1;
 944                         add_object_array(o, NULL, &want_obj);
 945                 }
 946         }
 947
 948         /*
 949          * We have sent all our refs already, and the other end
 950          * should have chosen out of them. When we are operating
 951          * in the stateless RPC mode, however, their choice may
 952          * have been based on the set of older refs advertised
 953          * by another process that handled the initial request.
 954          */
 955         if (has_non_tip)
 956                 check_non_tip();
 957
 958         if (!use_sideband && daemon_mode)
 959                 no_progress = 1;
 960
 961         if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
 962                 return;
 963
 964         if (send_shallow_list(depth, deepen_rev_list, deepen_since,
 965                               &deepen_not, &shallows))
 966                 packet_flush(1);
 967         object_array_clear(&shallows);
 968 }
 969
 970 /* return non-zero if the ref is hidden, otherwise 0 */
 971 static int mark_our_ref(const char *refname, const char *refname_full,
 972                         const struct object_id *oid)
 973 {
 974         struct object *o = lookup_unknown_object(oid->hash);
 975
 976         if (ref_is_hidden(refname, refname_full)) {
 977                 o->flags |= HIDDEN_REF;
 978                 return 1;
 979         }
 980         o->flags |= OUR_REF;
 981         return 0;
 982 }
 983
 984 static int check_ref(const char *refname_full, const struct object_id *oid,
 985                      int flag, void *cb_data)
 986 {
 987         const char *refname = strip_namespace(refname_full);
 988
 989         mark_our_ref(refname, refname_full, oid);
 990         return 0;
 991 }
 992
 993 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 994 {
 995         struct string_list_item *item;
 996
 997         if (!symref->nr)
 998                 return;
 999         for_each_string_list_item(item, symref)
1000                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1001 }
1002
1003 static int send_ref(const char *refname, const struct object_id *oid,
1004                     int flag, void *cb_data)
1005 {
1006         static const char *capabilities = "multi_ack thin-pack side-band"
1007                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1008                 " deepen-relative no-progress include-tag multi_ack_detailed";
1009         const char *refname_nons = strip_namespace(refname);
1010         struct object_id peeled;
1011
1012         if (mark_our_ref(refname_nons, refname, oid))
1013                 return 0;
1014
1015         if (capabilities) {
1016                 struct strbuf symref_info = STRBUF_INIT;
1017
1018                 format_symref_info(&symref_info, cb_data);
1019                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1020                              oid_to_hex(oid), refname_nons,
1021                              0, capabilities,
1022                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1023                                      " allow-tip-sha1-in-want" : "",
1024                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1025                                      " allow-reachable-sha1-in-want" : "",
1026                              stateless_rpc ? " no-done" : "",
1027                              symref_info.buf,
1028                              allow_filter ? " filter" : "",
1029                              git_user_agent_sanitized());
1030                 strbuf_release(&symref_info);
1031         } else {
1032                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1033         }
1034         capabilities = NULL;
1035         if (!peel_ref(refname, &peeled))
1036                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1037         return 0;
1038 }
1039
1040 static int find_symref(const char *refname, const struct object_id *oid,
1041                        int flag, void *cb_data)
1042 {
1043         const char *symref_target;
1044         struct string_list_item *item;
1045
1046         if ((flag & REF_ISSYMREF) == 0)
1047                 return 0;
1048         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1049         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1050                 die("'%s' is a symref but it is not?", refname);
1051         item = string_list_append(cb_data, refname);
1052         item->util = xstrdup(symref_target);
1053         return 0;
1054 }
1055
1056 static int upload_pack_config(const char *var, const char *value, void *unused)
1057 {
1058         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1059                 if (git_config_bool(var, value))
1060                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1061                 else
1062                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1063         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1064                 if (git_config_bool(var, value))
1065                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1066                 else
1067                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1068         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1069                 if (git_config_bool(var, value))
1070                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1071                 else
1072                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1073         } else if (!strcmp("uploadpack.keepalive", var)) {
1074                 keepalive = git_config_int(var, value);
1075                 if (!keepalive)
1076                         keepalive = -1;
1077         } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
1078                 if (!strcmp("uploadpack.packobjectshook", var))
1079                         return git_config_string(&pack_objects_hook, var, value);
1080         } else if (!strcmp("uploadpack.allowfilter", var)) {
1081                 allow_filter = git_config_bool(var, value);
1082         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1083                 allow_ref_in_want = git_config_bool(var, value);
1084         }
1085         return parse_hide_refs_config(var, value, "uploadpack");
1086 }
1087
1088 void upload_pack(struct upload_pack_options *options)
1089 {
1090         struct string_list symref = STRING_LIST_INIT_DUP;
1091
1092         stateless_rpc = options->stateless_rpc;
1093         timeout = options->timeout;
1094         daemon_mode = options->daemon_mode;
1095
1096         git_config(upload_pack_config, NULL);
1097
1098         head_ref_namespaced(find_symref, &symref);
1099
1100         if (options->advertise_refs || !stateless_rpc) {
1101                 reset_timeout();
1102                 head_ref_namespaced(send_ref, &symref);
1103                 for_each_namespaced_ref(send_ref, &symref);
1104                 advertise_shallow_grafts(1);
1105                 packet_flush(1);
1106         } else {
1107                 head_ref_namespaced(check_ref, NULL);
1108                 for_each_namespaced_ref(check_ref, NULL);
1109         }
1110         string_list_clear(&symref, 1);
1111         if (options->advertise_refs)
1112                 return;
1113
1114         receive_needs();
1115         if (want_obj.nr) {
1116                 get_common_commits();
1117                 create_pack_file();
1118         }
1119 }
1120
1121 struct upload_pack_data {
1122         struct object_array wants;
1123         struct string_list wanted_refs;
1124         struct oid_array haves;
1125
1126         struct object_array shallows;
1127         struct string_list deepen_not;
1128         int depth;
1129         timestamp_t deepen_since;
1130         int deepen_rev_list;
1131         int deepen_relative;
1132
1133         unsigned stateless_rpc : 1;
1134
1135         unsigned use_thin_pack : 1;
1136         unsigned use_ofs_delta : 1;
1137         unsigned no_progress : 1;
1138         unsigned use_include_tag : 1;
1139         unsigned done : 1;
1140 };
1141
1142 static void upload_pack_data_init(struct upload_pack_data *data)
1143 {
1144         struct object_array wants = OBJECT_ARRAY_INIT;
1145         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
1146         struct oid_array haves = OID_ARRAY_INIT;
1147         struct object_array shallows = OBJECT_ARRAY_INIT;
1148         struct string_list deepen_not = STRING_LIST_INIT_DUP;
1149
1150         memset(data, 0, sizeof(*data));
1151         data->wants = wants;
1152         data->wanted_refs = wanted_refs;
1153         data->haves = haves;
1154         data->shallows = shallows;
1155         data->deepen_not = deepen_not;
1156 }
1157
1158 static void upload_pack_data_clear(struct upload_pack_data *data)
1159 {
1160         object_array_clear(&data->wants);
1161         string_list_clear(&data->wanted_refs, 1);
1162         oid_array_clear(&data->haves);
1163         object_array_clear(&data->shallows);
1164         string_list_clear(&data->deepen_not, 0);
1165 }
1166
1167 static int parse_want(const char *line)
1168 {
1169         const char *arg;
1170         if (skip_prefix(line, "want ", &arg)) {
1171                 struct object_id oid;
1172                 struct object *o;
1173
1174                 if (get_oid_hex(arg, &oid))
1175                         die("git upload-pack: protocol error, "
1176                             "expected to get oid, not '%s'", line);
1177
1178                 o = parse_object(the_repository, &oid);
1179                 if (!o) {
1180                         packet_write_fmt(1,
1181                                          "ERR upload-pack: not our ref %s",
1182                                          oid_to_hex(&oid));
1183                         die("git upload-pack: not our ref %s",
1184                             oid_to_hex(&oid));
1185                 }
1186
1187                 if (!(o->flags & WANTED)) {
1188                         o->flags |= WANTED;
1189                         add_object_array(o, NULL, &want_obj);
1190                 }
1191
1192                 return 1;
1193         }
1194
1195         return 0;
1196 }
1197
1198 static int parse_want_ref(const char *line, struct string_list *wanted_refs)
1199 {
1200         const char *arg;
1201         if (skip_prefix(line, "want-ref ", &arg)) {
1202                 struct object_id oid;
1203                 struct string_list_item *item;
1204                 struct object *o;
1205
1206                 if (read_ref(arg, &oid)) {
1207                         packet_write_fmt(1, "ERR unknown ref %s", arg);
1208                         die("unknown ref %s", arg);
1209                 }
1210
1211                 item = string_list_append(wanted_refs, arg);
1212                 item->util = oiddup(&oid);
1213
1214                 o = parse_object_or_die(&oid, arg);
1215                 if (!(o->flags & WANTED)) {
1216                         o->flags |= WANTED;
1217                         add_object_array(o, NULL, &want_obj);
1218                 }
1219
1220                 return 1;
1221         }
1222
1223         return 0;
1224 }
1225
1226 static int parse_have(const char *line, struct oid_array *haves)
1227 {
1228         const char *arg;
1229         if (skip_prefix(line, "have ", &arg)) {
1230                 struct object_id oid;
1231
1232                 if (get_oid_hex(arg, &oid))
1233                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1234                 oid_array_append(haves, &oid);
1235                 return 1;
1236         }
1237
1238         return 0;
1239 }
1240
1241 static void process_args(struct packet_reader *request,
1242                          struct upload_pack_data *data)
1243 {
1244         while (packet_reader_read(request) != PACKET_READ_FLUSH) {
1245                 const char *arg = request->line;
1246                 const char *p;
1247
1248                 /* process want */
1249                 if (parse_want(arg))
1250                         continue;
1251                 if (allow_ref_in_want && parse_want_ref(arg, &data->wanted_refs))
1252                         continue;
1253                 /* process have line */
1254                 if (parse_have(arg, &data->haves))
1255                         continue;
1256
1257                 /* process args like thin-pack */
1258                 if (!strcmp(arg, "thin-pack")) {
1259                         use_thin_pack = 1;
1260                         continue;
1261                 }
1262                 if (!strcmp(arg, "ofs-delta")) {
1263                         use_ofs_delta = 1;
1264                         continue;
1265                 }
1266                 if (!strcmp(arg, "no-progress")) {
1267                         no_progress = 1;
1268                         continue;
1269                 }
1270                 if (!strcmp(arg, "include-tag")) {
1271                         use_include_tag = 1;
1272                         continue;
1273                 }
1274                 if (!strcmp(arg, "done")) {
1275                         data->done = 1;
1276                         continue;
1277                 }
1278
1279                 /* Shallow related arguments */
1280                 if (process_shallow(arg, &data->shallows))
1281                         continue;
1282                 if (process_deepen(arg, &data->depth))
1283                         continue;
1284                 if (process_deepen_since(arg, &data->deepen_since,
1285                                          &data->deepen_rev_list))
1286                         continue;
1287                 if (process_deepen_not(arg, &data->deepen_not,
1288                                        &data->deepen_rev_list))
1289                         continue;
1290                 if (!strcmp(arg, "deepen-relative")) {
1291                         data->deepen_relative = 1;
1292                         continue;
1293                 }
1294
1295                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1296                         parse_list_objects_filter(&filter_options, p);
1297                         continue;
1298                 }
1299
1300                 /* ignore unknown lines maybe? */
1301                 die("unexpected line: '%s'", arg);
1302         }
1303 }
1304
1305 static int process_haves(struct oid_array *haves, struct oid_array *common)
1306 {
1307         int i;
1308
1309         /* Process haves */
1310         for (i = 0; i < haves->nr; i++) {
1311                 const struct object_id *oid = &haves->oid[i];
1312                 struct object *o;
1313                 int we_knew_they_have = 0;
1314
1315                 if (!has_object_file(oid))
1316                         continue;
1317
1318                 oid_array_append(common, oid);
1319
1320                 o = parse_object(the_repository, oid);
1321                 if (!o)
1322                         die("oops (%s)", oid_to_hex(oid));
1323                 if (o->type == OBJ_COMMIT) {
1324                         struct commit_list *parents;
1325                         struct commit *commit = (struct commit *)o;
1326                         if (o->flags & THEY_HAVE)
1327                                 we_knew_they_have = 1;
1328                         else
1329                                 o->flags |= THEY_HAVE;
1330                         if (!oldest_have || (commit->date < oldest_have))
1331                                 oldest_have = commit->date;
1332                         for (parents = commit->parents;
1333                              parents;
1334                              parents = parents->next)
1335                                 parents->item->object.flags |= THEY_HAVE;
1336                 }
1337                 if (!we_knew_they_have)
1338                         add_object_array(o, NULL, &have_obj);
1339         }
1340
1341         return 0;
1342 }
1343
1344 static int send_acks(struct oid_array *acks, struct strbuf *response)
1345 {
1346         int i;
1347
1348         packet_buf_write(response, "acknowledgments\n");
1349
1350         /* Send Acks */
1351         if (!acks->nr)
1352                 packet_buf_write(response, "NAK\n");
1353
1354         for (i = 0; i < acks->nr; i++) {
1355                 packet_buf_write(response, "ACK %s\n",
1356                                  oid_to_hex(&acks->oid[i]));
1357         }
1358
1359         if (ok_to_give_up()) {
1360                 /* Send Ready */
1361                 packet_buf_write(response, "ready\n");
1362                 return 1;
1363         }
1364
1365         return 0;
1366 }
1367
1368 static int process_haves_and_send_acks(struct upload_pack_data *data)
1369 {
1370         struct oid_array common = OID_ARRAY_INIT;
1371         struct strbuf response = STRBUF_INIT;
1372         int ret = 0;
1373
1374         process_haves(&data->haves, &common);
1375         if (data->done) {
1376                 ret = 1;
1377         } else if (send_acks(&common, &response)) {
1378                 packet_buf_delim(&response);
1379                 ret = 1;
1380         } else {
1381                 /* Add Flush */
1382                 packet_buf_flush(&response);
1383                 ret = 0;
1384         }
1385
1386         /* Send response */
1387         write_or_die(1, response.buf, response.len);
1388         strbuf_release(&response);
1389
1390         oid_array_clear(&data->haves);
1391         oid_array_clear(&common);
1392         return ret;
1393 }
1394
1395 static void send_wanted_ref_info(struct upload_pack_data *data)
1396 {
1397         const struct string_list_item *item;
1398
1399         if (!data->wanted_refs.nr)
1400                 return;
1401
1402         packet_write_fmt(1, "wanted-refs\n");
1403
1404         for_each_string_list_item(item, &data->wanted_refs) {
1405                 packet_write_fmt(1, "%s %s\n",
1406                                  oid_to_hex(item->util),
1407                                  item->string);
1408         }
1409
1410         packet_delim(1);
1411 }
1412
1413 static void send_shallow_info(struct upload_pack_data *data)
1414 {
1415         /* No shallow info needs to be sent */
1416         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1417             !is_repository_shallow(the_repository))
1418                 return;
1419
1420         packet_write_fmt(1, "shallow-info\n");
1421
1422         if (!send_shallow_list(data->depth, data->deepen_rev_list,
1423                                data->deepen_since, &data->deepen_not,
1424                                &data->shallows) &&
1425             is_repository_shallow(the_repository))
1426                 deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
1427
1428         packet_delim(1);
1429 }
1430
1431 enum fetch_state {
1432         FETCH_PROCESS_ARGS = 0,
1433         FETCH_SEND_ACKS,
1434         FETCH_SEND_PACK,
1435         FETCH_DONE,
1436 };
1437
1438 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1439                    struct packet_reader *request)
1440 {
1441         enum fetch_state state = FETCH_PROCESS_ARGS;
1442         struct upload_pack_data data;
1443
1444         git_config(upload_pack_config, NULL);
1445
1446         upload_pack_data_init(&data);
1447         use_sideband = LARGE_PACKET_MAX;
1448
1449         while (state != FETCH_DONE) {
1450                 switch (state) {
1451                 case FETCH_PROCESS_ARGS:
1452                         process_args(request, &data);
1453
1454                         if (!want_obj.nr) {
1455                                 /*
1456                                  * Request didn't contain any 'want' lines,
1457                                  * guess they didn't want anything.
1458                                  */
1459                                 state = FETCH_DONE;
1460                         } else if (data.haves.nr) {
1461                                 /*
1462                                  * Request had 'have' lines, so lets ACK them.
1463                                  */
1464                                 state = FETCH_SEND_ACKS;
1465                         } else {
1466                                 /*
1467                                  * Request had 'want's but no 'have's so we can
1468                                  * immedietly go to construct and send a pack.
1469                                  */
1470                                 state = FETCH_SEND_PACK;
1471                         }
1472                         break;
1473                 case FETCH_SEND_ACKS:
1474                         if (process_haves_and_send_acks(&data))
1475                                 state = FETCH_SEND_PACK;
1476                         else
1477                                 state = FETCH_DONE;
1478                         break;
1479                 case FETCH_SEND_PACK:
1480                         send_wanted_ref_info(&data);
1481                         send_shallow_info(&data);
1482
1483                         packet_write_fmt(1, "packfile\n");
1484                         create_pack_file();
1485                         state = FETCH_DONE;
1486                         break;
1487                 case FETCH_DONE:
1488                         continue;
1489                 }
1490         }
1491
1492         upload_pack_data_clear(&data);
1493         return 0;
1494 }
1495
1496 int upload_pack_advertise(struct repository *r,
1497                           struct strbuf *value)
1498 {
1499         if (value) {
1500                 int allow_filter_value;
1501                 int allow_ref_in_want;
1502
1503                 strbuf_addstr(value, "shallow");
1504
1505                 if (!repo_config_get_bool(the_repository,
1506                                          "uploadpack.allowfilter",
1507                                          &allow_filter_value) &&
1508                     allow_filter_value)
1509                         strbuf_addstr(value, " filter");
1510
1511                 if (!repo_config_get_bool(the_repository,
1512                                          "uploadpack.allowrefinwant",
1513                                          &allow_ref_in_want) &&
1514                     allow_ref_in_want)
1515                         strbuf_addstr(value, " ref-in-want");
1516         }
1517
1518         return 1;
1519 }