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 #include "commit-graph.h"
  28 #include "commit-reach.h"
  29 #include "shallow.h"
  30
  31 /* Remember to update object flag allocation in object.h */
  32 #define THEY_HAVE       (1u << 11)
  33 #define OUR_REF         (1u << 12)
  34 #define WANTED          (1u << 13)
  35 #define COMMON_KNOWN    (1u << 14)
  36
  37 #define SHALLOW         (1u << 16)
  38 #define NOT_SHALLOW     (1u << 17)
  39 #define CLIENT_SHALLOW  (1u << 18)
  40 #define HIDDEN_REF      (1u << 19)
  41
  42 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
  43                 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
  44
  45 static timestamp_t oldest_have;
  46
  47 static int multi_ack;
  48 static int no_done;
  49 static int daemon_mode;
  50 /* Allow specifying sha1 if it is a ref tip. */
  51 #define ALLOW_TIP_SHA1  01
  52 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  53 #define ALLOW_REACHABLE_SHA1    02
  54 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  55 #define ALLOW_ANY_SHA1  07
  56 static unsigned int allow_unadvertised_object_request;
  57 static int shallow_nr;
  58 static struct object_array extra_edge_obj;
  59 static unsigned int timeout;
  60 static int keepalive = 5;
  61 /* 0 for no sideband,
  62  * otherwise maximum packet size (up to 65520 bytes).
  63  */
  64 static int use_sideband;
  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
  71 static int allow_sideband_all;
  72
  73 struct upload_pack_data {
  74         struct string_list symref;
  75         struct string_list wanted_refs;
  76         struct object_array want_obj;
  77         struct object_array have_obj;
  78         struct oid_array haves;
  79
  80         struct object_array shallows;
  81         struct string_list deepen_not;
  82         int depth;
  83         timestamp_t deepen_since;
  84         int deepen_rev_list;
  85         int deepen_relative;
  86
  87         struct list_objects_filter_options filter_options;
  88
  89         struct packet_writer writer;
  90
  91         unsigned stateless_rpc : 1;
  92
  93         unsigned use_thin_pack : 1;
  94         unsigned use_ofs_delta : 1;
  95         unsigned no_progress : 1;
  96         unsigned use_include_tag : 1;
  97         unsigned done : 1;
  98 };
  99
 100 static void upload_pack_data_init(struct upload_pack_data *data)
 101 {
 102         struct string_list symref = STRING_LIST_INIT_DUP;
 103         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 104         struct object_array want_obj = OBJECT_ARRAY_INIT;
 105         struct object_array have_obj = OBJECT_ARRAY_INIT;
 106         struct oid_array haves = OID_ARRAY_INIT;
 107         struct object_array shallows = OBJECT_ARRAY_INIT;
 108         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 109
 110         memset(data, 0, sizeof(*data));
 111         data->symref = symref;
 112         data->wanted_refs = wanted_refs;
 113         data->want_obj = want_obj;
 114         data->have_obj = have_obj;
 115         data->haves = haves;
 116         data->shallows = shallows;
 117         data->deepen_not = deepen_not;
 118         packet_writer_init(&data->writer, 1);
 119 }
 120
 121 static void upload_pack_data_clear(struct upload_pack_data *data)
 122 {
 123         string_list_clear(&data->symref, 1);
 124         string_list_clear(&data->wanted_refs, 1);
 125         object_array_clear(&data->want_obj);
 126         object_array_clear(&data->have_obj);
 127         oid_array_clear(&data->haves);
 128         object_array_clear(&data->shallows);
 129         string_list_clear(&data->deepen_not, 0);
 130         list_objects_filter_release(&data->filter_options);
 131 }
 132
 133 static void reset_timeout(void)
 134 {
 135         alarm(timeout);
 136 }
 137
 138 static void send_client_data(int fd, const char *data, ssize_t sz)
 139 {
 140         if (use_sideband) {
 141                 send_sideband(1, fd, data, sz, use_sideband);
 142                 return;
 143         }
 144         if (fd == 3)
 145                 /* emergency quit */
 146                 fd = 2;
 147         if (fd == 2) {
 148                 /* XXX: are we happy to lose stuff here? */
 149                 xwrite(fd, data, sz);
 150                 return;
 151         }
 152         write_or_die(fd, data, sz);
 153 }
 154
 155 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 156 {
 157         FILE *fp = cb_data;
 158         if (graft->nr_parent == -1)
 159                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 160         return 0;
 161 }
 162
 163 static void create_pack_file(struct upload_pack_data *pack_data)
 164 {
 165         struct child_process pack_objects = CHILD_PROCESS_INIT;
 166         char data[8193], progress[128];
 167         char abort_msg[] = "aborting due to possible repository "
 168                 "corruption on the remote side.";
 169         int buffered = -1;
 170         ssize_t sz;
 171         int i;
 172         FILE *pipe_fd;
 173
 174         if (!pack_objects_hook)
 175                 pack_objects.git_cmd = 1;
 176         else {
 177                 argv_array_push(&pack_objects.args, pack_objects_hook);
 178                 argv_array_push(&pack_objects.args, "git");
 179                 pack_objects.use_shell = 1;
 180         }
 181
 182         if (shallow_nr) {
 183                 argv_array_push(&pack_objects.args, "--shallow-file");
 184                 argv_array_push(&pack_objects.args, "");
 185         }
 186         argv_array_push(&pack_objects.args, "pack-objects");
 187         argv_array_push(&pack_objects.args, "--revs");
 188         if (pack_data->use_thin_pack)
 189                 argv_array_push(&pack_objects.args, "--thin");
 190
 191         argv_array_push(&pack_objects.args, "--stdout");
 192         if (shallow_nr)
 193                 argv_array_push(&pack_objects.args, "--shallow");
 194         if (!pack_data->no_progress)
 195                 argv_array_push(&pack_objects.args, "--progress");
 196         if (pack_data->use_ofs_delta)
 197                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 198         if (pack_data->use_include_tag)
 199                 argv_array_push(&pack_objects.args, "--include-tag");
 200         if (pack_data->filter_options.choice) {
 201                 const char *spec =
 202                         expand_list_objects_filter_spec(&pack_data->filter_options);
 203                 if (pack_objects.use_shell) {
 204                         struct strbuf buf = STRBUF_INIT;
 205                         sq_quote_buf(&buf, spec);
 206                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 207                         strbuf_release(&buf);
 208                 } else {
 209                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 210                                          spec);
 211                 }
 212         }
 213
 214         pack_objects.in = -1;
 215         pack_objects.out = -1;
 216         pack_objects.err = -1;
 217
 218         if (start_command(&pack_objects))
 219                 die("git upload-pack: unable to fork git-pack-objects");
 220
 221         pipe_fd = xfdopen(pack_objects.in, "w");
 222
 223         if (shallow_nr)
 224                 for_each_commit_graft(write_one_shallow, pipe_fd);
 225
 226         for (i = 0; i < pack_data->want_obj.nr; i++)
 227                 fprintf(pipe_fd, "%s\n",
 228                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 229         fprintf(pipe_fd, "--not\n");
 230         for (i = 0; i < pack_data->have_obj.nr; i++)
 231                 fprintf(pipe_fd, "%s\n",
 232                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 233         for (i = 0; i < extra_edge_obj.nr; i++)
 234                 fprintf(pipe_fd, "%s\n",
 235                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 236         fprintf(pipe_fd, "\n");
 237         fflush(pipe_fd);
 238         fclose(pipe_fd);
 239
 240         /* We read from pack_objects.err to capture stderr output for
 241          * progress bar, and pack_objects.out to capture the pack data.
 242          */
 243
 244         while (1) {
 245                 struct pollfd pfd[2];
 246                 int pe, pu, pollsize;
 247                 int ret;
 248
 249                 reset_timeout();
 250
 251                 pollsize = 0;
 252                 pe = pu = -1;
 253
 254                 if (0 <= pack_objects.out) {
 255                         pfd[pollsize].fd = pack_objects.out;
 256                         pfd[pollsize].events = POLLIN;
 257                         pu = pollsize;
 258                         pollsize++;
 259                 }
 260                 if (0 <= pack_objects.err) {
 261                         pfd[pollsize].fd = pack_objects.err;
 262                         pfd[pollsize].events = POLLIN;
 263                         pe = pollsize;
 264                         pollsize++;
 265                 }
 266
 267                 if (!pollsize)
 268                         break;
 269
 270                 ret = poll(pfd, pollsize,
 271                         keepalive < 0 ? -1 : 1000 * keepalive);
 272
 273                 if (ret < 0) {
 274                         if (errno != EINTR) {
 275                                 error_errno("poll failed, resuming");
 276                                 sleep(1);
 277                         }
 278                         continue;
 279                 }
 280                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 281                         /* Status ready; we ship that in the side-band
 282                          * or dump to the standard error.
 283                          */
 284                         sz = xread(pack_objects.err, progress,
 285                                   sizeof(progress));
 286                         if (0 < sz)
 287                                 send_client_data(2, progress, sz);
 288                         else if (sz == 0) {
 289                                 close(pack_objects.err);
 290                                 pack_objects.err = -1;
 291                         }
 292                         else
 293                                 goto fail;
 294                         /* give priority to status messages */
 295                         continue;
 296                 }
 297                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 298                         /* Data ready; we keep the last byte to ourselves
 299                          * in case we detect broken rev-list, so that we
 300                          * can leave the stream corrupted.  This is
 301                          * unfortunate -- unpack-objects would happily
 302                          * accept a valid packdata with trailing garbage,
 303                          * so appending garbage after we pass all the
 304                          * pack data is not good enough to signal
 305                          * breakage to downstream.
 306                          */
 307                         char *cp = data;
 308                         ssize_t outsz = 0;
 309                         if (0 <= buffered) {
 310                                 *cp++ = buffered;
 311                                 outsz++;
 312                         }
 313                         sz = xread(pack_objects.out, cp,
 314                                   sizeof(data) - outsz);
 315                         if (0 < sz)
 316                                 ;
 317                         else if (sz == 0) {
 318                                 close(pack_objects.out);
 319                                 pack_objects.out = -1;
 320                         }
 321                         else
 322                                 goto fail;
 323                         sz += outsz;
 324                         if (1 < sz) {
 325                                 buffered = data[sz-1] & 0xFF;
 326                                 sz--;
 327                         }
 328                         else
 329                                 buffered = -1;
 330                         send_client_data(1, data, sz);
 331                 }
 332
 333                 /*
 334                  * We hit the keepalive timeout without saying anything; send
 335                  * an empty message on the data sideband just to let the other
 336                  * side know we're still working on it, but don't have any data
 337                  * yet.
 338                  *
 339                  * If we don't have a sideband channel, there's no room in the
 340                  * protocol to say anything, so those clients are just out of
 341                  * luck.
 342                  */
 343                 if (!ret && use_sideband) {
 344                         static const char buf[] = "0005\1";
 345                         write_or_die(1, buf, 5);
 346                 }
 347         }
 348
 349         if (finish_command(&pack_objects)) {
 350                 error("git upload-pack: git-pack-objects died with error.");
 351                 goto fail;
 352         }
 353
 354         /* flush the data */
 355         if (0 <= buffered) {
 356                 data[0] = buffered;
 357                 send_client_data(1, data, 1);
 358                 fprintf(stderr, "flushed.\n");
 359         }
 360         if (use_sideband)
 361                 packet_flush(1);
 362         return;
 363
 364  fail:
 365         send_client_data(3, abort_msg, sizeof(abort_msg));
 366         die("git upload-pack: %s", abort_msg);
 367 }
 368
 369 static int got_oid(const char *hex, struct object_id *oid,
 370                    struct object_array *have_obj)
 371 {
 372         struct object *o;
 373         int we_knew_they_have = 0;
 374
 375         if (get_oid_hex(hex, oid))
 376                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 377         if (!has_object_file(oid))
 378                 return -1;
 379
 380         o = parse_object(the_repository, oid);
 381         if (!o)
 382                 die("oops (%s)", oid_to_hex(oid));
 383         if (o->type == OBJ_COMMIT) {
 384                 struct commit_list *parents;
 385                 struct commit *commit = (struct commit *)o;
 386                 if (o->flags & THEY_HAVE)
 387                         we_knew_they_have = 1;
 388                 else
 389                         o->flags |= THEY_HAVE;
 390                 if (!oldest_have || (commit->date < oldest_have))
 391                         oldest_have = commit->date;
 392                 for (parents = commit->parents;
 393                      parents;
 394                      parents = parents->next)
 395                         parents->item->object.flags |= THEY_HAVE;
 396         }
 397         if (!we_knew_they_have) {
 398                 add_object_array(o, NULL, have_obj);
 399                 return 1;
 400         }
 401         return 0;
 402 }
 403
 404 static int ok_to_give_up(const struct object_array *have_obj,
 405                          struct object_array *want_obj)
 406 {
 407         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 408
 409         if (!have_obj->nr)
 410                 return 0;
 411
 412         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 413                                             COMMON_KNOWN, oldest_have,
 414                                             min_generation);
 415 }
 416
 417 static int get_common_commits(struct upload_pack_data *data,
 418                               struct packet_reader *reader)
 419 {
 420         struct object_id oid;
 421         char last_hex[GIT_MAX_HEXSZ + 1];
 422         int got_common = 0;
 423         int got_other = 0;
 424         int sent_ready = 0;
 425
 426         save_commit_buffer = 0;
 427
 428         for (;;) {
 429                 const char *arg;
 430
 431                 reset_timeout();
 432
 433                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 434                         if (multi_ack == 2
 435                             && got_common
 436                             && !got_other
 437                             && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 438                                 sent_ready = 1;
 439                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 440                         }
 441                         if (data->have_obj.nr == 0 || multi_ack)
 442                                 packet_write_fmt(1, "NAK\n");
 443
 444                         if (no_done && sent_ready) {
 445                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 446                                 return 0;
 447                         }
 448                         if (data->stateless_rpc)
 449                                 exit(0);
 450                         got_common = 0;
 451                         got_other = 0;
 452                         continue;
 453                 }
 454                 if (skip_prefix(reader->line, "have ", &arg)) {
 455                         switch (got_oid(arg, &oid, &data->have_obj)) {
 456                         case -1: /* they have what we do not */
 457                                 got_other = 1;
 458                                 if (multi_ack
 459                                     && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 460                                         const char *hex = oid_to_hex(&oid);
 461                                         if (multi_ack == 2) {
 462                                                 sent_ready = 1;
 463                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 464                                         } else
 465                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 466                                 }
 467                                 break;
 468                         default:
 469                                 got_common = 1;
 470                                 oid_to_hex_r(last_hex, &oid);
 471                                 if (multi_ack == 2)
 472                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 473                                 else if (multi_ack)
 474                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 475                                 else if (data->have_obj.nr == 1)
 476                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 477                                 break;
 478                         }
 479                         continue;
 480                 }
 481                 if (!strcmp(reader->line, "done")) {
 482                         if (data->have_obj.nr > 0) {
 483                                 if (multi_ack)
 484                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 485                                 return 0;
 486                         }
 487                         packet_write_fmt(1, "NAK\n");
 488                         return -1;
 489                 }
 490                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 491         }
 492 }
 493
 494 static int is_our_ref(struct object *o)
 495 {
 496         int allow_hidden_ref = (allow_unadvertised_object_request &
 497                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 498         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 499 }
 500
 501 /*
 502  * on successful case, it's up to the caller to close cmd->out
 503  */
 504 static int do_reachable_revlist(struct child_process *cmd,
 505                                 struct object_array *src,
 506                                 struct object_array *reachable)
 507 {
 508         static const char *argv[] = {
 509                 "rev-list", "--stdin", NULL,
 510         };
 511         struct object *o;
 512         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 513         int i;
 514         const unsigned hexsz = the_hash_algo->hexsz;
 515
 516         cmd->argv = argv;
 517         cmd->git_cmd = 1;
 518         cmd->no_stderr = 1;
 519         cmd->in = -1;
 520         cmd->out = -1;
 521
 522         /*
 523          * If the next rev-list --stdin encounters an unknown commit,
 524          * it terminates, which will cause SIGPIPE in the write loop
 525          * below.
 526          */
 527         sigchain_push(SIGPIPE, SIG_IGN);
 528
 529         if (start_command(cmd))
 530                 goto error;
 531
 532         namebuf[0] = '^';
 533         namebuf[hexsz + 1] = '\n';
 534         for (i = get_max_object_index(); 0 < i; ) {
 535                 o = get_indexed_object(--i);
 536                 if (!o)
 537                         continue;
 538                 if (reachable && o->type == OBJ_COMMIT)
 539                         o->flags &= ~TMP_MARK;
 540                 if (!is_our_ref(o))
 541                         continue;
 542                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 543                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 544                         goto error;
 545         }
 546         namebuf[hexsz] = '\n';
 547         for (i = 0; i < src->nr; i++) {
 548                 o = src->objects[i].item;
 549                 if (is_our_ref(o)) {
 550                         if (reachable)
 551                                 add_object_array(o, NULL, reachable);
 552                         continue;
 553                 }
 554                 if (reachable && o->type == OBJ_COMMIT)
 555                         o->flags |= TMP_MARK;
 556                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 557                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 558                         goto error;
 559         }
 560         close(cmd->in);
 561         cmd->in = -1;
 562         sigchain_pop(SIGPIPE);
 563
 564         return 0;
 565
 566 error:
 567         sigchain_pop(SIGPIPE);
 568
 569         if (cmd->in >= 0)
 570                 close(cmd->in);
 571         if (cmd->out >= 0)
 572                 close(cmd->out);
 573         return -1;
 574 }
 575
 576 static int get_reachable_list(struct object_array *src,
 577                               struct object_array *reachable)
 578 {
 579         struct child_process cmd = CHILD_PROCESS_INIT;
 580         int i;
 581         struct object *o;
 582         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 583         const unsigned hexsz = the_hash_algo->hexsz;
 584
 585         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 586                 return -1;
 587
 588         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 589                 struct object_id oid;
 590                 const char *p;
 591
 592                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 593                         break;
 594
 595                 o = lookup_object(the_repository, &oid);
 596                 if (o && o->type == OBJ_COMMIT) {
 597                         o->flags &= ~TMP_MARK;
 598                 }
 599         }
 600         for (i = get_max_object_index(); 0 < i; i--) {
 601                 o = get_indexed_object(i - 1);
 602                 if (o && o->type == OBJ_COMMIT &&
 603                     (o->flags & TMP_MARK)) {
 604                         add_object_array(o, NULL, reachable);
 605                                 o->flags &= ~TMP_MARK;
 606                 }
 607         }
 608         close(cmd.out);
 609
 610         if (finish_command(&cmd))
 611                 return -1;
 612
 613         return 0;
 614 }
 615
 616 static int has_unreachable(struct object_array *src)
 617 {
 618         struct child_process cmd = CHILD_PROCESS_INIT;
 619         char buf[1];
 620         int i;
 621
 622         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 623                 return 1;
 624
 625         /*
 626          * The commits out of the rev-list are not ancestors of
 627          * our ref.
 628          */
 629         i = read_in_full(cmd.out, buf, 1);
 630         if (i)
 631                 goto error;
 632         close(cmd.out);
 633         cmd.out = -1;
 634
 635         /*
 636          * rev-list may have died by encountering a bad commit
 637          * in the history, in which case we do want to bail out
 638          * even when it showed no commit.
 639          */
 640         if (finish_command(&cmd))
 641                 goto error;
 642
 643         /* All the non-tip ones are ancestors of what we advertised */
 644         return 0;
 645
 646 error:
 647         sigchain_pop(SIGPIPE);
 648         if (cmd.out >= 0)
 649                 close(cmd.out);
 650         return 1;
 651 }
 652
 653 static void check_non_tip(struct upload_pack_data *data)
 654 {
 655         int i;
 656
 657         /*
 658          * In the normal in-process case without
 659          * uploadpack.allowReachableSHA1InWant,
 660          * non-tip requests can never happen.
 661          */
 662         if (!data->stateless_rpc
 663             && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 664                 goto error;
 665         if (!has_unreachable(&data->want_obj))
 666                 /* All the non-tip ones are ancestors of what we advertised */
 667                 return;
 668
 669 error:
 670         /* Pick one of them (we know there at least is one) */
 671         for (i = 0; i < data->want_obj.nr; i++) {
 672                 struct object *o = data->want_obj.objects[i].item;
 673                 if (!is_our_ref(o)) {
 674                         packet_writer_error(&data->writer,
 675                                             "upload-pack: not our ref %s",
 676                                             oid_to_hex(&o->oid));
 677                         die("git upload-pack: not our ref %s",
 678                             oid_to_hex(&o->oid));
 679                 }
 680         }
 681 }
 682
 683 static void send_shallow(struct packet_writer *writer,
 684                          struct commit_list *result)
 685 {
 686         while (result) {
 687                 struct object *object = &result->item->object;
 688                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 689                         packet_writer_write(writer, "shallow %s",
 690                                             oid_to_hex(&object->oid));
 691                         register_shallow(the_repository, &object->oid);
 692                         shallow_nr++;
 693                 }
 694                 result = result->next;
 695         }
 696 }
 697
 698 static void send_unshallow(struct packet_writer *writer,
 699                            const struct object_array *shallows,
 700                            struct object_array *want_obj)
 701 {
 702         int i;
 703
 704         for (i = 0; i < shallows->nr; i++) {
 705                 struct object *object = shallows->objects[i].item;
 706                 if (object->flags & NOT_SHALLOW) {
 707                         struct commit_list *parents;
 708                         packet_writer_write(writer, "unshallow %s",
 709                                             oid_to_hex(&object->oid));
 710                         object->flags &= ~CLIENT_SHALLOW;
 711                         /*
 712                          * We want to _register_ "object" as shallow, but we
 713                          * also need to traverse object's parents to deepen a
 714                          * shallow clone. Unregister it for now so we can
 715                          * parse and add the parents to the want list, then
 716                          * re-register it.
 717                          */
 718                         unregister_shallow(&object->oid);
 719                         object->parsed = 0;
 720                         parse_commit_or_die((struct commit *)object);
 721                         parents = ((struct commit *)object)->parents;
 722                         while (parents) {
 723                                 add_object_array(&parents->item->object,
 724                                                  NULL, want_obj);
 725                                 parents = parents->next;
 726                         }
 727                         add_object_array(object, NULL, &extra_edge_obj);
 728                 }
 729                 /* make sure commit traversal conforms to client */
 730                 register_shallow(the_repository, &object->oid);
 731         }
 732 }
 733
 734 static int check_ref(const char *refname_full, const struct object_id *oid,
 735                      int flag, void *cb_data);
 736 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
 737                    struct object_array *shallows, struct object_array *want_obj)
 738 {
 739         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 740                 int i;
 741
 742                 for (i = 0; i < shallows->nr; i++) {
 743                         struct object *object = shallows->objects[i].item;
 744                         object->flags |= NOT_SHALLOW;
 745                 }
 746         } else if (deepen_relative) {
 747                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 748                 struct commit_list *result;
 749
 750                 /*
 751                  * Checking for reachable shallows requires that our refs be
 752                  * marked with OUR_REF.
 753                  */
 754                 head_ref_namespaced(check_ref, NULL);
 755                 for_each_namespaced_ref(check_ref, NULL);
 756
 757                 get_reachable_list(shallows, &reachable_shallows);
 758                 result = get_shallow_commits(&reachable_shallows,
 759                                              depth + 1,
 760                                              SHALLOW, NOT_SHALLOW);
 761                 send_shallow(writer, result);
 762                 free_commit_list(result);
 763                 object_array_clear(&reachable_shallows);
 764         } else {
 765                 struct commit_list *result;
 766
 767                 result = get_shallow_commits(want_obj, depth,
 768                                              SHALLOW, NOT_SHALLOW);
 769                 send_shallow(writer, result);
 770                 free_commit_list(result);
 771         }
 772
 773         send_unshallow(writer, shallows, want_obj);
 774 }
 775
 776 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
 777                                const char **av,
 778                                struct object_array *shallows,
 779                                struct object_array *want_obj)
 780 {
 781         struct commit_list *result;
 782
 783         disable_commit_graph(the_repository);
 784         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 785         send_shallow(writer, result);
 786         free_commit_list(result);
 787         send_unshallow(writer, shallows, want_obj);
 788 }
 789
 790 /* Returns 1 if a shallow list is sent or 0 otherwise */
 791 static int send_shallow_list(struct packet_writer *writer,
 792                              int depth, int deepen_rev_list,
 793                              timestamp_t deepen_since,
 794                              struct string_list *deepen_not,
 795                              int deepen_relative,
 796                              struct object_array *shallows,
 797                              struct object_array *want_obj)
 798 {
 799         int ret = 0;
 800
 801         if (depth > 0 && deepen_rev_list)
 802                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 803         if (depth > 0) {
 804                 deepen(writer, depth, deepen_relative, shallows, want_obj);
 805                 ret = 1;
 806         } else if (deepen_rev_list) {
 807                 struct argv_array av = ARGV_ARRAY_INIT;
 808                 int i;
 809
 810                 argv_array_push(&av, "rev-list");
 811                 if (deepen_since)
 812                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 813                 if (deepen_not->nr) {
 814                         argv_array_push(&av, "--not");
 815                         for (i = 0; i < deepen_not->nr; i++) {
 816                                 struct string_list_item *s = deepen_not->items + i;
 817                                 argv_array_push(&av, s->string);
 818                         }
 819                         argv_array_push(&av, "--not");
 820                 }
 821                 for (i = 0; i < want_obj->nr; i++) {
 822                         struct object *o = want_obj->objects[i].item;
 823                         argv_array_push(&av, oid_to_hex(&o->oid));
 824                 }
 825                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
 826                 argv_array_clear(&av);
 827                 ret = 1;
 828         } else {
 829                 if (shallows->nr > 0) {
 830                         int i;
 831                         for (i = 0; i < shallows->nr; i++)
 832                                 register_shallow(the_repository,
 833                                                  &shallows->objects[i].item->oid);
 834                 }
 835         }
 836
 837         shallow_nr += shallows->nr;
 838         return ret;
 839 }
 840
 841 static int process_shallow(const char *line, struct object_array *shallows)
 842 {
 843         const char *arg;
 844         if (skip_prefix(line, "shallow ", &arg)) {
 845                 struct object_id oid;
 846                 struct object *object;
 847                 if (get_oid_hex(arg, &oid))
 848                         die("invalid shallow line: %s", line);
 849                 object = parse_object(the_repository, &oid);
 850                 if (!object)
 851                         return 1;
 852                 if (object->type != OBJ_COMMIT)
 853                         die("invalid shallow object %s", oid_to_hex(&oid));
 854                 if (!(object->flags & CLIENT_SHALLOW)) {
 855                         object->flags |= CLIENT_SHALLOW;
 856                         add_object_array(object, NULL, shallows);
 857                 }
 858                 return 1;
 859         }
 860
 861         return 0;
 862 }
 863
 864 static int process_deepen(const char *line, int *depth)
 865 {
 866         const char *arg;
 867         if (skip_prefix(line, "deepen ", &arg)) {
 868                 char *end = NULL;
 869                 *depth = (int)strtol(arg, &end, 0);
 870                 if (!end || *end || *depth <= 0)
 871                         die("Invalid deepen: %s", line);
 872                 return 1;
 873         }
 874
 875         return 0;
 876 }
 877
 878 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 879 {
 880         const char *arg;
 881         if (skip_prefix(line, "deepen-since ", &arg)) {
 882                 char *end = NULL;
 883                 *deepen_since = parse_timestamp(arg, &end, 0);
 884                 if (!end || *end || !deepen_since ||
 885                     /* revisions.c's max_age -1 is special */
 886                     *deepen_since == -1)
 887                         die("Invalid deepen-since: %s", line);
 888                 *deepen_rev_list = 1;
 889                 return 1;
 890         }
 891         return 0;
 892 }
 893
 894 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 895 {
 896         const char *arg;
 897         if (skip_prefix(line, "deepen-not ", &arg)) {
 898                 char *ref = NULL;
 899                 struct object_id oid;
 900                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 901                         die("git upload-pack: ambiguous deepen-not: %s", line);
 902                 string_list_append(deepen_not, ref);
 903                 free(ref);
 904                 *deepen_rev_list = 1;
 905                 return 1;
 906         }
 907         return 0;
 908 }
 909
 910 static void receive_needs(struct upload_pack_data *data,
 911                           struct packet_reader *reader)
 912 {
 913         int has_non_tip = 0;
 914
 915         shallow_nr = 0;
 916         for (;;) {
 917                 struct object *o;
 918                 const char *features;
 919                 struct object_id oid_buf;
 920                 const char *arg;
 921
 922                 reset_timeout();
 923                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 924                         break;
 925
 926                 if (process_shallow(reader->line, &data->shallows))
 927                         continue;
 928                 if (process_deepen(reader->line, &data->depth))
 929                         continue;
 930                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
 931                         continue;
 932                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
 933                         continue;
 934
 935                 if (skip_prefix(reader->line, "filter ", &arg)) {
 936                         if (!filter_capability_requested)
 937                                 die("git upload-pack: filtering capability not negotiated");
 938                         list_objects_filter_die_if_populated(&data->filter_options);
 939                         parse_list_objects_filter(&data->filter_options, arg);
 940                         continue;
 941                 }
 942
 943                 if (!skip_prefix(reader->line, "want ", &arg) ||
 944                     parse_oid_hex(arg, &oid_buf, &features))
 945                         die("git upload-pack: protocol error, "
 946                             "expected to get object ID, not '%s'", reader->line);
 947
 948                 if (parse_feature_request(features, "deepen-relative"))
 949                         data->deepen_relative = 1;
 950                 if (parse_feature_request(features, "multi_ack_detailed"))
 951                         multi_ack = 2;
 952                 else if (parse_feature_request(features, "multi_ack"))
 953                         multi_ack = 1;
 954                 if (parse_feature_request(features, "no-done"))
 955                         no_done = 1;
 956                 if (parse_feature_request(features, "thin-pack"))
 957                         data->use_thin_pack = 1;
 958                 if (parse_feature_request(features, "ofs-delta"))
 959                         data->use_ofs_delta = 1;
 960                 if (parse_feature_request(features, "side-band-64k"))
 961                         use_sideband = LARGE_PACKET_MAX;
 962                 else if (parse_feature_request(features, "side-band"))
 963                         use_sideband = DEFAULT_PACKET_MAX;
 964                 if (parse_feature_request(features, "no-progress"))
 965                         data->no_progress = 1;
 966                 if (parse_feature_request(features, "include-tag"))
 967                         data->use_include_tag = 1;
 968                 if (allow_filter && parse_feature_request(features, "filter"))
 969                         filter_capability_requested = 1;
 970
 971                 o = parse_object(the_repository, &oid_buf);
 972                 if (!o) {
 973                         packet_writer_error(&data->writer,
 974                                             "upload-pack: not our ref %s",
 975                                             oid_to_hex(&oid_buf));
 976                         die("git upload-pack: not our ref %s",
 977                             oid_to_hex(&oid_buf));
 978                 }
 979                 if (!(o->flags & WANTED)) {
 980                         o->flags |= WANTED;
 981                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 982                               || is_our_ref(o)))
 983                                 has_non_tip = 1;
 984                         add_object_array(o, NULL, &data->want_obj);
 985                 }
 986         }
 987
 988         /*
 989          * We have sent all our refs already, and the other end
 990          * should have chosen out of them. When we are operating
 991          * in the stateless RPC mode, however, their choice may
 992          * have been based on the set of older refs advertised
 993          * by another process that handled the initial request.
 994          */
 995         if (has_non_tip)
 996                 check_non_tip(data);
 997
 998         if (!use_sideband && daemon_mode)
 999                 data->no_progress = 1;
1000
1001         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1002                 return;
1003
1004         if (send_shallow_list(&data->writer,
1005                               data->depth,
1006                               data->deepen_rev_list,
1007                               data->deepen_since,
1008                               &data->deepen_not,
1009                               data->deepen_relative,
1010                               &data->shallows,
1011                               &data->want_obj))
1012                 packet_flush(1);
1013 }
1014
1015 /* return non-zero if the ref is hidden, otherwise 0 */
1016 static int mark_our_ref(const char *refname, const char *refname_full,
1017                         const struct object_id *oid)
1018 {
1019         struct object *o = lookup_unknown_object(oid);
1020
1021         if (ref_is_hidden(refname, refname_full)) {
1022                 o->flags |= HIDDEN_REF;
1023                 return 1;
1024         }
1025         o->flags |= OUR_REF;
1026         return 0;
1027 }
1028
1029 static int check_ref(const char *refname_full, const struct object_id *oid,
1030                      int flag, void *cb_data)
1031 {
1032         const char *refname = strip_namespace(refname_full);
1033
1034         mark_our_ref(refname, refname_full, oid);
1035         return 0;
1036 }
1037
1038 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1039 {
1040         struct string_list_item *item;
1041
1042         if (!symref->nr)
1043                 return;
1044         for_each_string_list_item(item, symref)
1045                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1046 }
1047
1048 static int send_ref(const char *refname, const struct object_id *oid,
1049                     int flag, void *cb_data)
1050 {
1051         static const char *capabilities = "multi_ack thin-pack side-band"
1052                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1053                 " deepen-relative no-progress include-tag multi_ack_detailed";
1054         const char *refname_nons = strip_namespace(refname);
1055         struct object_id peeled;
1056         struct upload_pack_data *data = cb_data;
1057
1058         if (mark_our_ref(refname_nons, refname, oid))
1059                 return 0;
1060
1061         if (capabilities) {
1062                 struct strbuf symref_info = STRBUF_INIT;
1063
1064                 format_symref_info(&symref_info, &data->symref);
1065                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1066                              oid_to_hex(oid), refname_nons,
1067                              0, capabilities,
1068                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1069                                      " allow-tip-sha1-in-want" : "",
1070                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1071                                      " allow-reachable-sha1-in-want" : "",
1072                              data->stateless_rpc ? " no-done" : "",
1073                              symref_info.buf,
1074                              allow_filter ? " filter" : "",
1075                              git_user_agent_sanitized());
1076                 strbuf_release(&symref_info);
1077         } else {
1078                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1079         }
1080         capabilities = NULL;
1081         if (!peel_ref(refname, &peeled))
1082                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1083         return 0;
1084 }
1085
1086 static int find_symref(const char *refname, const struct object_id *oid,
1087                        int flag, void *cb_data)
1088 {
1089         const char *symref_target;
1090         struct string_list_item *item;
1091
1092         if ((flag & REF_ISSYMREF) == 0)
1093                 return 0;
1094         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1095         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1096                 die("'%s' is a symref but it is not?", refname);
1097         item = string_list_append(cb_data, strip_namespace(refname));
1098         item->util = xstrdup(strip_namespace(symref_target));
1099         return 0;
1100 }
1101
1102 static int upload_pack_config(const char *var, const char *value, void *unused)
1103 {
1104         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1105                 if (git_config_bool(var, value))
1106                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1107                 else
1108                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1109         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1110                 if (git_config_bool(var, value))
1111                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1112                 else
1113                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1114         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1115                 if (git_config_bool(var, value))
1116                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1117                 else
1118                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1119         } else if (!strcmp("uploadpack.keepalive", var)) {
1120                 keepalive = git_config_int(var, value);
1121                 if (!keepalive)
1122                         keepalive = -1;
1123         } else if (!strcmp("uploadpack.allowfilter", var)) {
1124                 allow_filter = git_config_bool(var, value);
1125         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1126                 allow_ref_in_want = git_config_bool(var, value);
1127         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1128                 allow_sideband_all = git_config_bool(var, value);
1129         } else if (!strcmp("core.precomposeunicode", var)) {
1130                 precomposed_unicode = git_config_bool(var, value);
1131         }
1132
1133         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1134         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1135                 if (!strcmp("uploadpack.packobjectshook", var))
1136                         return git_config_string(&pack_objects_hook, var, value);
1137         }
1138
1139         return parse_hide_refs_config(var, value, "uploadpack");
1140 }
1141
1142 void upload_pack(struct upload_pack_options *options)
1143 {
1144         struct packet_reader reader;
1145         struct upload_pack_data data;
1146
1147         timeout = options->timeout;
1148         daemon_mode = options->daemon_mode;
1149
1150         git_config(upload_pack_config, NULL);
1151
1152         upload_pack_data_init(&data);
1153
1154         data.stateless_rpc = options->stateless_rpc;
1155
1156         head_ref_namespaced(find_symref, &data.symref);
1157
1158         if (options->advertise_refs || !data.stateless_rpc) {
1159                 reset_timeout();
1160                 head_ref_namespaced(send_ref, &data);
1161                 for_each_namespaced_ref(send_ref, &data);
1162                 advertise_shallow_grafts(1);
1163                 packet_flush(1);
1164         } else {
1165                 head_ref_namespaced(check_ref, NULL);
1166                 for_each_namespaced_ref(check_ref, NULL);
1167         }
1168
1169         if (!options->advertise_refs) {
1170                 packet_reader_init(&reader, 0, NULL, 0,
1171                                    PACKET_READ_CHOMP_NEWLINE |
1172                                    PACKET_READ_DIE_ON_ERR_PACKET);
1173
1174                 receive_needs(&data, &reader);
1175                 if (data.want_obj.nr) {
1176                         get_common_commits(&data, &reader);
1177                         create_pack_file(&data);
1178                 }
1179         }
1180
1181         upload_pack_data_clear(&data);
1182 }
1183
1184 static int parse_want(struct packet_writer *writer, const char *line,
1185                       struct object_array *want_obj)
1186 {
1187         const char *arg;
1188         if (skip_prefix(line, "want ", &arg)) {
1189                 struct object_id oid;
1190                 struct object *o;
1191
1192                 if (get_oid_hex(arg, &oid))
1193                         die("git upload-pack: protocol error, "
1194                             "expected to get oid, not '%s'", line);
1195
1196                 o = parse_object(the_repository, &oid);
1197                 if (!o) {
1198                         packet_writer_error(writer,
1199                                             "upload-pack: not our ref %s",
1200                                             oid_to_hex(&oid));
1201                         die("git upload-pack: not our ref %s",
1202                             oid_to_hex(&oid));
1203                 }
1204
1205                 if (!(o->flags & WANTED)) {
1206                         o->flags |= WANTED;
1207                         add_object_array(o, NULL, want_obj);
1208                 }
1209
1210                 return 1;
1211         }
1212
1213         return 0;
1214 }
1215
1216 static int parse_want_ref(struct packet_writer *writer, const char *line,
1217                           struct string_list *wanted_refs,
1218                           struct object_array *want_obj)
1219 {
1220         const char *arg;
1221         if (skip_prefix(line, "want-ref ", &arg)) {
1222                 struct object_id oid;
1223                 struct string_list_item *item;
1224                 struct object *o;
1225
1226                 if (read_ref(arg, &oid)) {
1227                         packet_writer_error(writer, "unknown ref %s", arg);
1228                         die("unknown ref %s", arg);
1229                 }
1230
1231                 item = string_list_append(wanted_refs, arg);
1232                 item->util = oiddup(&oid);
1233
1234                 o = parse_object_or_die(&oid, arg);
1235                 if (!(o->flags & WANTED)) {
1236                         o->flags |= WANTED;
1237                         add_object_array(o, NULL, want_obj);
1238                 }
1239
1240                 return 1;
1241         }
1242
1243         return 0;
1244 }
1245
1246 static int parse_have(const char *line, struct oid_array *haves)
1247 {
1248         const char *arg;
1249         if (skip_prefix(line, "have ", &arg)) {
1250                 struct object_id oid;
1251
1252                 if (get_oid_hex(arg, &oid))
1253                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1254                 oid_array_append(haves, &oid);
1255                 return 1;
1256         }
1257
1258         return 0;
1259 }
1260
1261 static void process_args(struct packet_reader *request,
1262                          struct upload_pack_data *data)
1263 {
1264         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1265                 const char *arg = request->line;
1266                 const char *p;
1267
1268                 /* process want */
1269                 if (parse_want(&data->writer, arg, &data->want_obj))
1270                         continue;
1271                 if (allow_ref_in_want &&
1272                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1273                                    &data->want_obj))
1274                         continue;
1275                 /* process have line */
1276                 if (parse_have(arg, &data->haves))
1277                         continue;
1278
1279                 /* process args like thin-pack */
1280                 if (!strcmp(arg, "thin-pack")) {
1281                         data->use_thin_pack = 1;
1282                         continue;
1283                 }
1284                 if (!strcmp(arg, "ofs-delta")) {
1285                         data->use_ofs_delta = 1;
1286                         continue;
1287                 }
1288                 if (!strcmp(arg, "no-progress")) {
1289                         data->no_progress = 1;
1290                         continue;
1291                 }
1292                 if (!strcmp(arg, "include-tag")) {
1293                         data->use_include_tag = 1;
1294                         continue;
1295                 }
1296                 if (!strcmp(arg, "done")) {
1297                         data->done = 1;
1298                         continue;
1299                 }
1300
1301                 /* Shallow related arguments */
1302                 if (process_shallow(arg, &data->shallows))
1303                         continue;
1304                 if (process_deepen(arg, &data->depth))
1305                         continue;
1306                 if (process_deepen_since(arg, &data->deepen_since,
1307                                          &data->deepen_rev_list))
1308                         continue;
1309                 if (process_deepen_not(arg, &data->deepen_not,
1310                                        &data->deepen_rev_list))
1311                         continue;
1312                 if (!strcmp(arg, "deepen-relative")) {
1313                         data->deepen_relative = 1;
1314                         continue;
1315                 }
1316
1317                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1318                         list_objects_filter_die_if_populated(&data->filter_options);
1319                         parse_list_objects_filter(&data->filter_options, p);
1320                         continue;
1321                 }
1322
1323                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1324                      allow_sideband_all) &&
1325                     !strcmp(arg, "sideband-all")) {
1326                         data->writer.use_sideband = 1;
1327                         continue;
1328                 }
1329
1330                 /* ignore unknown lines maybe? */
1331                 die("unexpected line: '%s'", arg);
1332         }
1333
1334         if (request->status != PACKET_READ_FLUSH)
1335                 die(_("expected flush after fetch arguments"));
1336 }
1337
1338 static int process_haves(struct oid_array *haves, struct oid_array *common,
1339                          struct object_array *have_obj)
1340 {
1341         int i;
1342
1343         /* Process haves */
1344         for (i = 0; i < haves->nr; i++) {
1345                 const struct object_id *oid = &haves->oid[i];
1346                 struct object *o;
1347                 int we_knew_they_have = 0;
1348
1349                 if (!has_object_file(oid))
1350                         continue;
1351
1352                 oid_array_append(common, oid);
1353
1354                 o = parse_object(the_repository, oid);
1355                 if (!o)
1356                         die("oops (%s)", oid_to_hex(oid));
1357                 if (o->type == OBJ_COMMIT) {
1358                         struct commit_list *parents;
1359                         struct commit *commit = (struct commit *)o;
1360                         if (o->flags & THEY_HAVE)
1361                                 we_knew_they_have = 1;
1362                         else
1363                                 o->flags |= THEY_HAVE;
1364                         if (!oldest_have || (commit->date < oldest_have))
1365                                 oldest_have = commit->date;
1366                         for (parents = commit->parents;
1367                              parents;
1368                              parents = parents->next)
1369                                 parents->item->object.flags |= THEY_HAVE;
1370                 }
1371                 if (!we_knew_they_have)
1372                         add_object_array(o, NULL, have_obj);
1373         }
1374
1375         return 0;
1376 }
1377
1378 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1379                      const struct object_array *have_obj,
1380                      struct object_array *want_obj)
1381 {
1382         int i;
1383
1384         packet_writer_write(writer, "acknowledgments\n");
1385
1386         /* Send Acks */
1387         if (!acks->nr)
1388                 packet_writer_write(writer, "NAK\n");
1389
1390         for (i = 0; i < acks->nr; i++) {
1391                 packet_writer_write(writer, "ACK %s\n",
1392                                     oid_to_hex(&acks->oid[i]));
1393         }
1394
1395         if (ok_to_give_up(have_obj, want_obj)) {
1396                 /* Send Ready */
1397                 packet_writer_write(writer, "ready\n");
1398                 return 1;
1399         }
1400
1401         return 0;
1402 }
1403
1404 static int process_haves_and_send_acks(struct upload_pack_data *data)
1405 {
1406         struct oid_array common = OID_ARRAY_INIT;
1407         int ret = 0;
1408
1409         process_haves(&data->haves, &common, &data->have_obj);
1410         if (data->done) {
1411                 ret = 1;
1412         } else if (send_acks(&data->writer, &common,
1413                              &data->have_obj, &data->want_obj)) {
1414                 packet_writer_delim(&data->writer);
1415                 ret = 1;
1416         } else {
1417                 /* Add Flush */
1418                 packet_writer_flush(&data->writer);
1419                 ret = 0;
1420         }
1421
1422         oid_array_clear(&data->haves);
1423         oid_array_clear(&common);
1424         return ret;
1425 }
1426
1427 static void send_wanted_ref_info(struct upload_pack_data *data)
1428 {
1429         const struct string_list_item *item;
1430
1431         if (!data->wanted_refs.nr)
1432                 return;
1433
1434         packet_writer_write(&data->writer, "wanted-refs\n");
1435
1436         for_each_string_list_item(item, &data->wanted_refs) {
1437                 packet_writer_write(&data->writer, "%s %s\n",
1438                                     oid_to_hex(item->util),
1439                                     item->string);
1440         }
1441
1442         packet_writer_delim(&data->writer);
1443 }
1444
1445 static void send_shallow_info(struct upload_pack_data *data)
1446 {
1447         /* No shallow info needs to be sent */
1448         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1449             !is_repository_shallow(the_repository))
1450                 return;
1451
1452         packet_writer_write(&data->writer, "shallow-info\n");
1453
1454         if (!send_shallow_list(&data->writer, data->depth,
1455                                data->deepen_rev_list,
1456                                data->deepen_since, &data->deepen_not,
1457                                data->deepen_relative,
1458                                &data->shallows, &data->want_obj) &&
1459             is_repository_shallow(the_repository))
1460                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1461                        &data->shallows, &data->want_obj);
1462
1463         packet_delim(1);
1464 }
1465
1466 enum fetch_state {
1467         FETCH_PROCESS_ARGS = 0,
1468         FETCH_SEND_ACKS,
1469         FETCH_SEND_PACK,
1470         FETCH_DONE,
1471 };
1472
1473 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1474                    struct packet_reader *request)
1475 {
1476         enum fetch_state state = FETCH_PROCESS_ARGS;
1477         struct upload_pack_data data;
1478
1479         clear_object_flags(ALL_FLAGS);
1480
1481         git_config(upload_pack_config, NULL);
1482
1483         upload_pack_data_init(&data);
1484         use_sideband = LARGE_PACKET_MAX;
1485
1486         while (state != FETCH_DONE) {
1487                 switch (state) {
1488                 case FETCH_PROCESS_ARGS:
1489                         process_args(request, &data);
1490
1491                         if (!data.want_obj.nr) {
1492                                 /*
1493                                  * Request didn't contain any 'want' lines,
1494                                  * guess they didn't want anything.
1495                                  */
1496                                 state = FETCH_DONE;
1497                         } else if (data.haves.nr) {
1498                                 /*
1499                                  * Request had 'have' lines, so lets ACK them.
1500                                  */
1501                                 state = FETCH_SEND_ACKS;
1502                         } else {
1503                                 /*
1504                                  * Request had 'want's but no 'have's so we can
1505                                  * immedietly go to construct and send a pack.
1506                                  */
1507                                 state = FETCH_SEND_PACK;
1508                         }
1509                         break;
1510                 case FETCH_SEND_ACKS:
1511                         if (process_haves_and_send_acks(&data))
1512                                 state = FETCH_SEND_PACK;
1513                         else
1514                                 state = FETCH_DONE;
1515                         break;
1516                 case FETCH_SEND_PACK:
1517                         send_wanted_ref_info(&data);
1518                         send_shallow_info(&data);
1519
1520                         packet_writer_write(&data.writer, "packfile\n");
1521                         create_pack_file(&data);
1522                         state = FETCH_DONE;
1523                         break;
1524                 case FETCH_DONE:
1525                         continue;
1526                 }
1527         }
1528
1529         upload_pack_data_clear(&data);
1530         return 0;
1531 }
1532
1533 int upload_pack_advertise(struct repository *r,
1534                           struct strbuf *value)
1535 {
1536         if (value) {
1537                 int allow_filter_value;
1538                 int allow_ref_in_want;
1539                 int allow_sideband_all_value;
1540
1541                 strbuf_addstr(value, "shallow");
1542
1543                 if (!repo_config_get_bool(the_repository,
1544                                          "uploadpack.allowfilter",
1545                                          &allow_filter_value) &&
1546                     allow_filter_value)
1547                         strbuf_addstr(value, " filter");
1548
1549                 if (!repo_config_get_bool(the_repository,
1550                                          "uploadpack.allowrefinwant",
1551                                          &allow_ref_in_want) &&
1552                     allow_ref_in_want)
1553                         strbuf_addstr(value, " ref-in-want");
1554
1555                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1556                     (!repo_config_get_bool(the_repository,
1557                                            "uploadpack.allowsidebandall",
1558                                            &allow_sideband_all_value) &&
1559                      allow_sideband_all_value))
1560                         strbuf_addstr(value, " sideband-all");
1561         }
1562
1563         return 1;
1564 }