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 "strvec.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 /* Enum for allowed unadvertised object request (UOR) */
  46 enum allow_uor {
  47         /* Allow specifying sha1 if it is a ref tip. */
  48         ALLOW_TIP_SHA1 = 0x01,
  49         /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  50         ALLOW_REACHABLE_SHA1 = 0x02,
  51         /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  52         ALLOW_ANY_SHA1 = 0x07
  53 };
  54
  55 /*
  56  * Please annotate, and if possible group together, fields used only
  57  * for protocol v0 or only for protocol v2.
  58  */
  59 struct upload_pack_data {
  60         struct string_list symref;                              /* v0 only */
  61         struct object_array want_obj;
  62         struct object_array have_obj;
  63         struct oid_array haves;                                 /* v2 only */
  64         struct string_list wanted_refs;                         /* v2 only */
  65
  66         struct object_array shallows;
  67         struct string_list deepen_not;
  68         struct object_array extra_edge_obj;
  69         int depth;
  70         timestamp_t deepen_since;
  71         int deepen_rev_list;
  72         int deepen_relative;
  73         int keepalive;
  74         int shallow_nr;
  75         timestamp_t oldest_have;
  76
  77         unsigned int timeout;                                   /* v0 only */
  78         enum {
  79                 NO_MULTI_ACK = 0,
  80                 MULTI_ACK = 1,
  81                 MULTI_ACK_DETAILED = 2
  82         } multi_ack;                                            /* v0 only */
  83
  84         /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
  85         int use_sideband;
  86
  87         struct string_list uri_protocols;
  88         enum allow_uor allow_uor;
  89
  90         struct list_objects_filter_options filter_options;
  91         struct string_list allowed_filters;
  92
  93         struct packet_writer writer;
  94
  95         const char *pack_objects_hook;
  96
  97         unsigned stateless_rpc : 1;                             /* v0 only */
  98         unsigned no_done : 1;                                   /* v0 only */
  99         unsigned daemon_mode : 1;                               /* v0 only */
 100         unsigned filter_capability_requested : 1;               /* v0 only */
 101
 102         unsigned use_thin_pack : 1;
 103         unsigned use_ofs_delta : 1;
 104         unsigned no_progress : 1;
 105         unsigned use_include_tag : 1;
 106         unsigned allow_filter : 1;
 107         unsigned allow_filter_fallback : 1;
 108         unsigned long tree_filter_max_depth;
 109
 110         unsigned done : 1;                                      /* v2 only */
 111         unsigned allow_ref_in_want : 1;                         /* v2 only */
 112         unsigned allow_sideband_all : 1;                        /* v2 only */
 113 };
 114
 115 static void upload_pack_data_init(struct upload_pack_data *data)
 116 {
 117         struct string_list symref = STRING_LIST_INIT_DUP;
 118         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 119         struct object_array want_obj = OBJECT_ARRAY_INIT;
 120         struct object_array have_obj = OBJECT_ARRAY_INIT;
 121         struct oid_array haves = OID_ARRAY_INIT;
 122         struct object_array shallows = OBJECT_ARRAY_INIT;
 123         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 124         struct string_list uri_protocols = STRING_LIST_INIT_DUP;
 125         struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
 126         struct string_list allowed_filters = STRING_LIST_INIT_DUP;
 127
 128         memset(data, 0, sizeof(*data));
 129         data->symref = symref;
 130         data->wanted_refs = wanted_refs;
 131         data->want_obj = want_obj;
 132         data->have_obj = have_obj;
 133         data->haves = haves;
 134         data->shallows = shallows;
 135         data->deepen_not = deepen_not;
 136         data->uri_protocols = uri_protocols;
 137         data->extra_edge_obj = extra_edge_obj;
 138         data->allowed_filters = allowed_filters;
 139         data->allow_filter_fallback = 1;
 140         data->tree_filter_max_depth = ULONG_MAX;
 141         packet_writer_init(&data->writer, 1);
 142
 143         data->keepalive = 5;
 144 }
 145
 146 static void upload_pack_data_clear(struct upload_pack_data *data)
 147 {
 148         string_list_clear(&data->symref, 1);
 149         string_list_clear(&data->wanted_refs, 1);
 150         object_array_clear(&data->want_obj);
 151         object_array_clear(&data->have_obj);
 152         oid_array_clear(&data->haves);
 153         object_array_clear(&data->shallows);
 154         string_list_clear(&data->deepen_not, 0);
 155         object_array_clear(&data->extra_edge_obj);
 156         list_objects_filter_release(&data->filter_options);
 157         string_list_clear(&data->allowed_filters, 1);
 158
 159         free((char *)data->pack_objects_hook);
 160 }
 161
 162 static void reset_timeout(unsigned int timeout)
 163 {
 164         alarm(timeout);
 165 }
 166
 167 static void send_client_data(int fd, const char *data, ssize_t sz,
 168                              int use_sideband)
 169 {
 170         if (use_sideband) {
 171                 send_sideband(1, fd, data, sz, use_sideband);
 172                 return;
 173         }
 174         if (fd == 3)
 175                 /* emergency quit */
 176                 fd = 2;
 177         if (fd == 2) {
 178                 /* XXX: are we happy to lose stuff here? */
 179                 xwrite(fd, data, sz);
 180                 return;
 181         }
 182         write_or_die(fd, data, sz);
 183 }
 184
 185 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 186 {
 187         FILE *fp = cb_data;
 188         if (graft->nr_parent == -1)
 189                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 190         return 0;
 191 }
 192
 193 struct output_state {
 194         char buffer[8193];
 195         int used;
 196         unsigned packfile_uris_started : 1;
 197         unsigned packfile_started : 1;
 198 };
 199
 200 static int relay_pack_data(int pack_objects_out, struct output_state *os,
 201                            int use_sideband, int write_packfile_line)
 202 {
 203         /*
 204          * We keep the last byte to ourselves
 205          * in case we detect broken rev-list, so that we
 206          * can leave the stream corrupted.  This is
 207          * unfortunate -- unpack-objects would happily
 208          * accept a valid packdata with trailing garbage,
 209          * so appending garbage after we pass all the
 210          * pack data is not good enough to signal
 211          * breakage to downstream.
 212          */
 213         ssize_t readsz;
 214
 215         readsz = xread(pack_objects_out, os->buffer + os->used,
 216                        sizeof(os->buffer) - os->used);
 217         if (readsz < 0) {
 218                 return readsz;
 219         }
 220         os->used += readsz;
 221
 222         while (!os->packfile_started) {
 223                 char *p;
 224                 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
 225                         os->packfile_started = 1;
 226                         if (write_packfile_line) {
 227                                 if (os->packfile_uris_started)
 228                                         packet_delim(1);
 229                                 packet_write_fmt(1, "\1packfile\n");
 230                         }
 231                         break;
 232                 }
 233                 if ((p = memchr(os->buffer, '\n', os->used))) {
 234                         if (!os->packfile_uris_started) {
 235                                 os->packfile_uris_started = 1;
 236                                 if (!write_packfile_line)
 237                                         BUG("packfile_uris requires sideband-all");
 238                                 packet_write_fmt(1, "\1packfile-uris\n");
 239                         }
 240                         *p = '\0';
 241                         packet_write_fmt(1, "\1%s\n", os->buffer);
 242
 243                         os->used -= p - os->buffer + 1;
 244                         memmove(os->buffer, p + 1, os->used);
 245                 } else {
 246                         /*
 247                          * Incomplete line.
 248                          */
 249                         return readsz;
 250                 }
 251         }
 252
 253         if (os->used > 1) {
 254                 send_client_data(1, os->buffer, os->used - 1, use_sideband);
 255                 os->buffer[0] = os->buffer[os->used - 1];
 256                 os->used = 1;
 257         } else {
 258                 send_client_data(1, os->buffer, os->used, use_sideband);
 259                 os->used = 0;
 260         }
 261
 262         return readsz;
 263 }
 264
 265 static void create_pack_file(struct upload_pack_data *pack_data,
 266                              const struct string_list *uri_protocols)
 267 {
 268         struct child_process pack_objects = CHILD_PROCESS_INIT;
 269         struct output_state output_state = { { 0 } };
 270         char progress[128];
 271         char abort_msg[] = "aborting due to possible repository "
 272                 "corruption on the remote side.";
 273         ssize_t sz;
 274         int i;
 275         FILE *pipe_fd;
 276
 277         if (!pack_data->pack_objects_hook)
 278                 pack_objects.git_cmd = 1;
 279         else {
 280                 strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
 281                 strvec_push(&pack_objects.args, "git");
 282                 pack_objects.use_shell = 1;
 283         }
 284
 285         if (pack_data->shallow_nr) {
 286                 strvec_push(&pack_objects.args, "--shallow-file");
 287                 strvec_push(&pack_objects.args, "");
 288         }
 289         strvec_push(&pack_objects.args, "pack-objects");
 290         strvec_push(&pack_objects.args, "--revs");
 291         if (pack_data->use_thin_pack)
 292                 strvec_push(&pack_objects.args, "--thin");
 293
 294         strvec_push(&pack_objects.args, "--stdout");
 295         if (pack_data->shallow_nr)
 296                 strvec_push(&pack_objects.args, "--shallow");
 297         if (!pack_data->no_progress)
 298                 strvec_push(&pack_objects.args, "--progress");
 299         if (pack_data->use_ofs_delta)
 300                 strvec_push(&pack_objects.args, "--delta-base-offset");
 301         if (pack_data->use_include_tag)
 302                 strvec_push(&pack_objects.args, "--include-tag");
 303         if (pack_data->filter_options.choice) {
 304                 const char *spec =
 305                         expand_list_objects_filter_spec(&pack_data->filter_options);
 306                 if (pack_objects.use_shell) {
 307                         struct strbuf buf = STRBUF_INIT;
 308                         sq_quote_buf(&buf, spec);
 309                         strvec_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 310                         strbuf_release(&buf);
 311                 } else {
 312                         strvec_pushf(&pack_objects.args, "--filter=%s", spec);
 313                 }
 314         }
 315         if (uri_protocols) {
 316                 for (i = 0; i < uri_protocols->nr; i++)
 317                         strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
 318                                          uri_protocols->items[i].string);
 319         }
 320
 321         pack_objects.in = -1;
 322         pack_objects.out = -1;
 323         pack_objects.err = -1;
 324
 325         if (start_command(&pack_objects))
 326                 die("git upload-pack: unable to fork git-pack-objects");
 327
 328         pipe_fd = xfdopen(pack_objects.in, "w");
 329
 330         if (pack_data->shallow_nr)
 331                 for_each_commit_graft(write_one_shallow, pipe_fd);
 332
 333         for (i = 0; i < pack_data->want_obj.nr; i++)
 334                 fprintf(pipe_fd, "%s\n",
 335                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 336         fprintf(pipe_fd, "--not\n");
 337         for (i = 0; i < pack_data->have_obj.nr; i++)
 338                 fprintf(pipe_fd, "%s\n",
 339                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 340         for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
 341                 fprintf(pipe_fd, "%s\n",
 342                         oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
 343         fprintf(pipe_fd, "\n");
 344         fflush(pipe_fd);
 345         fclose(pipe_fd);
 346
 347         /* We read from pack_objects.err to capture stderr output for
 348          * progress bar, and pack_objects.out to capture the pack data.
 349          */
 350
 351         while (1) {
 352                 struct pollfd pfd[2];
 353                 int pe, pu, pollsize, polltimeout;
 354                 int ret;
 355
 356                 reset_timeout(pack_data->timeout);
 357
 358                 pollsize = 0;
 359                 pe = pu = -1;
 360
 361                 if (0 <= pack_objects.out) {
 362                         pfd[pollsize].fd = pack_objects.out;
 363                         pfd[pollsize].events = POLLIN;
 364                         pu = pollsize;
 365                         pollsize++;
 366                 }
 367                 if (0 <= pack_objects.err) {
 368                         pfd[pollsize].fd = pack_objects.err;
 369                         pfd[pollsize].events = POLLIN;
 370                         pe = pollsize;
 371                         pollsize++;
 372                 }
 373
 374                 if (!pollsize)
 375                         break;
 376
 377                 polltimeout = pack_data->keepalive < 0
 378                         ? -1
 379                         : 1000 * pack_data->keepalive;
 380
 381                 ret = poll(pfd, pollsize, polltimeout);
 382
 383                 if (ret < 0) {
 384                         if (errno != EINTR) {
 385                                 error_errno("poll failed, resuming");
 386                                 sleep(1);
 387                         }
 388                         continue;
 389                 }
 390                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 391                         /* Status ready; we ship that in the side-band
 392                          * or dump to the standard error.
 393                          */
 394                         sz = xread(pack_objects.err, progress,
 395                                   sizeof(progress));
 396                         if (0 < sz)
 397                                 send_client_data(2, progress, sz,
 398                                                  pack_data->use_sideband);
 399                         else if (sz == 0) {
 400                                 close(pack_objects.err);
 401                                 pack_objects.err = -1;
 402                         }
 403                         else
 404                                 goto fail;
 405                         /* give priority to status messages */
 406                         continue;
 407                 }
 408                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 409                         int result = relay_pack_data(pack_objects.out,
 410                                                      &output_state,
 411                                                      pack_data->use_sideband,
 412                                                      !!uri_protocols);
 413
 414                         if (result == 0) {
 415                                 close(pack_objects.out);
 416                                 pack_objects.out = -1;
 417                         } else if (result < 0) {
 418                                 goto fail;
 419                         }
 420                 }
 421
 422                 /*
 423                  * We hit the keepalive timeout without saying anything; send
 424                  * an empty message on the data sideband just to let the other
 425                  * side know we're still working on it, but don't have any data
 426                  * yet.
 427                  *
 428                  * If we don't have a sideband channel, there's no room in the
 429                  * protocol to say anything, so those clients are just out of
 430                  * luck.
 431                  */
 432                 if (!ret && pack_data->use_sideband) {
 433                         static const char buf[] = "0005\1";
 434                         write_or_die(1, buf, 5);
 435                 }
 436         }
 437
 438         if (finish_command(&pack_objects)) {
 439                 error("git upload-pack: git-pack-objects died with error.");
 440                 goto fail;
 441         }
 442
 443         /* flush the data */
 444         if (output_state.used > 0) {
 445                 send_client_data(1, output_state.buffer, output_state.used,
 446                                  pack_data->use_sideband);
 447                 fprintf(stderr, "flushed.\n");
 448         }
 449         if (pack_data->use_sideband)
 450                 packet_flush(1);
 451         return;
 452
 453  fail:
 454         send_client_data(3, abort_msg, sizeof(abort_msg),
 455                          pack_data->use_sideband);
 456         die("git upload-pack: %s", abort_msg);
 457 }
 458
 459 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
 460 {
 461         int we_knew_they_have = 0;
 462         struct object *o = parse_object(the_repository, oid);
 463
 464         if (!o)
 465                 die("oops (%s)", oid_to_hex(oid));
 466         if (o->type == OBJ_COMMIT) {
 467                 struct commit_list *parents;
 468                 struct commit *commit = (struct commit *)o;
 469                 if (o->flags & THEY_HAVE)
 470                         we_knew_they_have = 1;
 471                 else
 472                         o->flags |= THEY_HAVE;
 473                 if (!data->oldest_have || (commit->date < data->oldest_have))
 474                         data->oldest_have = commit->date;
 475                 for (parents = commit->parents;
 476                      parents;
 477                      parents = parents->next)
 478                         parents->item->object.flags |= THEY_HAVE;
 479         }
 480         if (!we_knew_they_have) {
 481                 add_object_array(o, NULL, &data->have_obj);
 482                 return 1;
 483         }
 484         return 0;
 485 }
 486
 487 static int got_oid(struct upload_pack_data *data,
 488                    const char *hex, struct object_id *oid)
 489 {
 490         if (get_oid_hex(hex, oid))
 491                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 492         if (!has_object_file_with_flags(oid,
 493                                         OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
 494                 return -1;
 495         return do_got_oid(data, oid);
 496 }
 497
 498 static int ok_to_give_up(struct upload_pack_data *data)
 499 {
 500         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 501
 502         if (!data->have_obj.nr)
 503                 return 0;
 504
 505         return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
 506                                             COMMON_KNOWN, data->oldest_have,
 507                                             min_generation);
 508 }
 509
 510 static int get_common_commits(struct upload_pack_data *data,
 511                               struct packet_reader *reader)
 512 {
 513         struct object_id oid;
 514         char last_hex[GIT_MAX_HEXSZ + 1];
 515         int got_common = 0;
 516         int got_other = 0;
 517         int sent_ready = 0;
 518
 519         save_commit_buffer = 0;
 520
 521         for (;;) {
 522                 const char *arg;
 523
 524                 reset_timeout(data->timeout);
 525
 526                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 527                         if (data->multi_ack == MULTI_ACK_DETAILED
 528                             && got_common
 529                             && !got_other
 530                             && ok_to_give_up(data)) {
 531                                 sent_ready = 1;
 532                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 533                         }
 534                         if (data->have_obj.nr == 0 || data->multi_ack)
 535                                 packet_write_fmt(1, "NAK\n");
 536
 537                         if (data->no_done && sent_ready) {
 538                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 539                                 return 0;
 540                         }
 541                         if (data->stateless_rpc)
 542                                 exit(0);
 543                         got_common = 0;
 544                         got_other = 0;
 545                         continue;
 546                 }
 547                 if (skip_prefix(reader->line, "have ", &arg)) {
 548                         switch (got_oid(data, arg, &oid)) {
 549                         case -1: /* they have what we do not */
 550                                 got_other = 1;
 551                                 if (data->multi_ack
 552                                     && ok_to_give_up(data)) {
 553                                         const char *hex = oid_to_hex(&oid);
 554                                         if (data->multi_ack == MULTI_ACK_DETAILED) {
 555                                                 sent_ready = 1;
 556                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 557                                         } else
 558                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 559                                 }
 560                                 break;
 561                         default:
 562                                 got_common = 1;
 563                                 oid_to_hex_r(last_hex, &oid);
 564                                 if (data->multi_ack == MULTI_ACK_DETAILED)
 565                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 566                                 else if (data->multi_ack)
 567                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 568                                 else if (data->have_obj.nr == 1)
 569                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 570                                 break;
 571                         }
 572                         continue;
 573                 }
 574                 if (!strcmp(reader->line, "done")) {
 575                         if (data->have_obj.nr > 0) {
 576                                 if (data->multi_ack)
 577                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 578                                 return 0;
 579                         }
 580                         packet_write_fmt(1, "NAK\n");
 581                         return -1;
 582                 }
 583                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 584         }
 585 }
 586
 587 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
 588 {
 589         int allow_hidden_ref = (allow_uor &
 590                                 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 591         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 592 }
 593
 594 /*
 595  * on successful case, it's up to the caller to close cmd->out
 596  */
 597 static int do_reachable_revlist(struct child_process *cmd,
 598                                 struct object_array *src,
 599                                 struct object_array *reachable,
 600                                 enum allow_uor allow_uor)
 601 {
 602         static const char *argv[] = {
 603                 "rev-list", "--stdin", NULL,
 604         };
 605         struct object *o;
 606         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 607         int i;
 608         const unsigned hexsz = the_hash_algo->hexsz;
 609
 610         cmd->argv = argv;
 611         cmd->git_cmd = 1;
 612         cmd->no_stderr = 1;
 613         cmd->in = -1;
 614         cmd->out = -1;
 615
 616         /*
 617          * If the next rev-list --stdin encounters an unknown commit,
 618          * it terminates, which will cause SIGPIPE in the write loop
 619          * below.
 620          */
 621         sigchain_push(SIGPIPE, SIG_IGN);
 622
 623         if (start_command(cmd))
 624                 goto error;
 625
 626         namebuf[0] = '^';
 627         namebuf[hexsz + 1] = '\n';
 628         for (i = get_max_object_index(); 0 < i; ) {
 629                 o = get_indexed_object(--i);
 630                 if (!o)
 631                         continue;
 632                 if (reachable && o->type == OBJ_COMMIT)
 633                         o->flags &= ~TMP_MARK;
 634                 if (!is_our_ref(o, allow_uor))
 635                         continue;
 636                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 637                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 638                         goto error;
 639         }
 640         namebuf[hexsz] = '\n';
 641         for (i = 0; i < src->nr; i++) {
 642                 o = src->objects[i].item;
 643                 if (is_our_ref(o, allow_uor)) {
 644                         if (reachable)
 645                                 add_object_array(o, NULL, reachable);
 646                         continue;
 647                 }
 648                 if (reachable && o->type == OBJ_COMMIT)
 649                         o->flags |= TMP_MARK;
 650                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 651                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 652                         goto error;
 653         }
 654         close(cmd->in);
 655         cmd->in = -1;
 656         sigchain_pop(SIGPIPE);
 657
 658         return 0;
 659
 660 error:
 661         sigchain_pop(SIGPIPE);
 662
 663         if (cmd->in >= 0)
 664                 close(cmd->in);
 665         if (cmd->out >= 0)
 666                 close(cmd->out);
 667         return -1;
 668 }
 669
 670 static int get_reachable_list(struct upload_pack_data *data,
 671                               struct object_array *reachable)
 672 {
 673         struct child_process cmd = CHILD_PROCESS_INIT;
 674         int i;
 675         struct object *o;
 676         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 677         const unsigned hexsz = the_hash_algo->hexsz;
 678
 679         if (do_reachable_revlist(&cmd, &data->shallows, reachable,
 680                                  data->allow_uor) < 0)
 681                 return -1;
 682
 683         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 684                 struct object_id oid;
 685                 const char *p;
 686
 687                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 688                         break;
 689
 690                 o = lookup_object(the_repository, &oid);
 691                 if (o && o->type == OBJ_COMMIT) {
 692                         o->flags &= ~TMP_MARK;
 693                 }
 694         }
 695         for (i = get_max_object_index(); 0 < i; i--) {
 696                 o = get_indexed_object(i - 1);
 697                 if (o && o->type == OBJ_COMMIT &&
 698                     (o->flags & TMP_MARK)) {
 699                         add_object_array(o, NULL, reachable);
 700                                 o->flags &= ~TMP_MARK;
 701                 }
 702         }
 703         close(cmd.out);
 704
 705         if (finish_command(&cmd))
 706                 return -1;
 707
 708         return 0;
 709 }
 710
 711 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
 712 {
 713         struct child_process cmd = CHILD_PROCESS_INIT;
 714         char buf[1];
 715         int i;
 716
 717         if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
 718                 return 1;
 719
 720         /*
 721          * The commits out of the rev-list are not ancestors of
 722          * our ref.
 723          */
 724         i = read_in_full(cmd.out, buf, 1);
 725         if (i)
 726                 goto error;
 727         close(cmd.out);
 728         cmd.out = -1;
 729
 730         /*
 731          * rev-list may have died by encountering a bad commit
 732          * in the history, in which case we do want to bail out
 733          * even when it showed no commit.
 734          */
 735         if (finish_command(&cmd))
 736                 goto error;
 737
 738         /* All the non-tip ones are ancestors of what we advertised */
 739         return 0;
 740
 741 error:
 742         if (cmd.out >= 0)
 743                 close(cmd.out);
 744         return 1;
 745 }
 746
 747 static void check_non_tip(struct upload_pack_data *data)
 748 {
 749         int i;
 750
 751         /*
 752          * In the normal in-process case without
 753          * uploadpack.allowReachableSHA1InWant,
 754          * non-tip requests can never happen.
 755          */
 756         if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
 757                 goto error;
 758         if (!has_unreachable(&data->want_obj, data->allow_uor))
 759                 /* All the non-tip ones are ancestors of what we advertised */
 760                 return;
 761
 762 error:
 763         /* Pick one of them (we know there at least is one) */
 764         for (i = 0; i < data->want_obj.nr; i++) {
 765                 struct object *o = data->want_obj.objects[i].item;
 766                 if (!is_our_ref(o, data->allow_uor)) {
 767                         packet_writer_error(&data->writer,
 768                                             "upload-pack: not our ref %s",
 769                                             oid_to_hex(&o->oid));
 770                         die("git upload-pack: not our ref %s",
 771                             oid_to_hex(&o->oid));
 772                 }
 773         }
 774 }
 775
 776 static void send_shallow(struct upload_pack_data *data,
 777                          struct commit_list *result)
 778 {
 779         while (result) {
 780                 struct object *object = &result->item->object;
 781                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 782                         packet_writer_write(&data->writer, "shallow %s",
 783                                             oid_to_hex(&object->oid));
 784                         register_shallow(the_repository, &object->oid);
 785                         data->shallow_nr++;
 786                 }
 787                 result = result->next;
 788         }
 789 }
 790
 791 static void send_unshallow(struct upload_pack_data *data)
 792 {
 793         int i;
 794
 795         for (i = 0; i < data->shallows.nr; i++) {
 796                 struct object *object = data->shallows.objects[i].item;
 797                 if (object->flags & NOT_SHALLOW) {
 798                         struct commit_list *parents;
 799                         packet_writer_write(&data->writer, "unshallow %s",
 800                                             oid_to_hex(&object->oid));
 801                         object->flags &= ~CLIENT_SHALLOW;
 802                         /*
 803                          * We want to _register_ "object" as shallow, but we
 804                          * also need to traverse object's parents to deepen a
 805                          * shallow clone. Unregister it for now so we can
 806                          * parse and add the parents to the want list, then
 807                          * re-register it.
 808                          */
 809                         unregister_shallow(&object->oid);
 810                         object->parsed = 0;
 811                         parse_commit_or_die((struct commit *)object);
 812                         parents = ((struct commit *)object)->parents;
 813                         while (parents) {
 814                                 add_object_array(&parents->item->object,
 815                                                  NULL, &data->want_obj);
 816                                 parents = parents->next;
 817                         }
 818                         add_object_array(object, NULL, &data->extra_edge_obj);
 819                 }
 820                 /* make sure commit traversal conforms to client */
 821                 register_shallow(the_repository, &object->oid);
 822         }
 823 }
 824
 825 static int check_ref(const char *refname_full, const struct object_id *oid,
 826                      int flag, void *cb_data);
 827 static void deepen(struct upload_pack_data *data, int depth)
 828 {
 829         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 830                 int i;
 831
 832                 for (i = 0; i < data->shallows.nr; i++) {
 833                         struct object *object = data->shallows.objects[i].item;
 834                         object->flags |= NOT_SHALLOW;
 835                 }
 836         } else if (data->deepen_relative) {
 837                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 838                 struct commit_list *result;
 839
 840                 /*
 841                  * Checking for reachable shallows requires that our refs be
 842                  * marked with OUR_REF.
 843                  */
 844                 head_ref_namespaced(check_ref, NULL);
 845                 for_each_namespaced_ref(check_ref, NULL);
 846
 847                 get_reachable_list(data, &reachable_shallows);
 848                 result = get_shallow_commits(&reachable_shallows,
 849                                              depth + 1,
 850                                              SHALLOW, NOT_SHALLOW);
 851                 send_shallow(data, result);
 852                 free_commit_list(result);
 853                 object_array_clear(&reachable_shallows);
 854         } else {
 855                 struct commit_list *result;
 856
 857                 result = get_shallow_commits(&data->want_obj, depth,
 858                                              SHALLOW, NOT_SHALLOW);
 859                 send_shallow(data, result);
 860                 free_commit_list(result);
 861         }
 862
 863         send_unshallow(data);
 864 }
 865
 866 static void deepen_by_rev_list(struct upload_pack_data *data,
 867                                int ac,
 868                                const char **av)
 869 {
 870         struct commit_list *result;
 871
 872         disable_commit_graph(the_repository);
 873         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 874         send_shallow(data, result);
 875         free_commit_list(result);
 876         send_unshallow(data);
 877 }
 878
 879 /* Returns 1 if a shallow list is sent or 0 otherwise */
 880 static int send_shallow_list(struct upload_pack_data *data)
 881 {
 882         int ret = 0;
 883
 884         if (data->depth > 0 && data->deepen_rev_list)
 885                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 886         if (data->depth > 0) {
 887                 deepen(data, data->depth);
 888                 ret = 1;
 889         } else if (data->deepen_rev_list) {
 890                 struct strvec av = STRVEC_INIT;
 891                 int i;
 892
 893                 strvec_push(&av, "rev-list");
 894                 if (data->deepen_since)
 895                         strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
 896                 if (data->deepen_not.nr) {
 897                         strvec_push(&av, "--not");
 898                         for (i = 0; i < data->deepen_not.nr; i++) {
 899                                 struct string_list_item *s = data->deepen_not.items + i;
 900                                 strvec_push(&av, s->string);
 901                         }
 902                         strvec_push(&av, "--not");
 903                 }
 904                 for (i = 0; i < data->want_obj.nr; i++) {
 905                         struct object *o = data->want_obj.objects[i].item;
 906                         strvec_push(&av, oid_to_hex(&o->oid));
 907                 }
 908                 deepen_by_rev_list(data, av.nr, av.v);
 909                 strvec_clear(&av);
 910                 ret = 1;
 911         } else {
 912                 if (data->shallows.nr > 0) {
 913                         int i;
 914                         for (i = 0; i < data->shallows.nr; i++)
 915                                 register_shallow(the_repository,
 916                                                  &data->shallows.objects[i].item->oid);
 917                 }
 918         }
 919
 920         data->shallow_nr += data->shallows.nr;
 921         return ret;
 922 }
 923
 924 static int process_shallow(const char *line, struct object_array *shallows)
 925 {
 926         const char *arg;
 927         if (skip_prefix(line, "shallow ", &arg)) {
 928                 struct object_id oid;
 929                 struct object *object;
 930                 if (get_oid_hex(arg, &oid))
 931                         die("invalid shallow line: %s", line);
 932                 object = parse_object(the_repository, &oid);
 933                 if (!object)
 934                         return 1;
 935                 if (object->type != OBJ_COMMIT)
 936                         die("invalid shallow object %s", oid_to_hex(&oid));
 937                 if (!(object->flags & CLIENT_SHALLOW)) {
 938                         object->flags |= CLIENT_SHALLOW;
 939                         add_object_array(object, NULL, shallows);
 940                 }
 941                 return 1;
 942         }
 943
 944         return 0;
 945 }
 946
 947 static int process_deepen(const char *line, int *depth)
 948 {
 949         const char *arg;
 950         if (skip_prefix(line, "deepen ", &arg)) {
 951                 char *end = NULL;
 952                 *depth = (int)strtol(arg, &end, 0);
 953                 if (!end || *end || *depth <= 0)
 954                         die("Invalid deepen: %s", line);
 955                 return 1;
 956         }
 957
 958         return 0;
 959 }
 960
 961 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 962 {
 963         const char *arg;
 964         if (skip_prefix(line, "deepen-since ", &arg)) {
 965                 char *end = NULL;
 966                 *deepen_since = parse_timestamp(arg, &end, 0);
 967                 if (!end || *end || !deepen_since ||
 968                     /* revisions.c's max_age -1 is special */
 969                     *deepen_since == -1)
 970                         die("Invalid deepen-since: %s", line);
 971                 *deepen_rev_list = 1;
 972                 return 1;
 973         }
 974         return 0;
 975 }
 976
 977 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 978 {
 979         const char *arg;
 980         if (skip_prefix(line, "deepen-not ", &arg)) {
 981                 char *ref = NULL;
 982                 struct object_id oid;
 983                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 984                         die("git upload-pack: ambiguous deepen-not: %s", line);
 985                 string_list_append(deepen_not, ref);
 986                 free(ref);
 987                 *deepen_rev_list = 1;
 988                 return 1;
 989         }
 990         return 0;
 991 }
 992
 993 NORETURN __attribute__((format(printf,2,3)))
 994 static void send_err_and_die(struct upload_pack_data *data,
 995                              const char *fmt, ...)
 996 {
 997         struct strbuf buf = STRBUF_INIT;
 998         va_list ap;
 999
1000         va_start(ap, fmt);
1001         strbuf_vaddf(&buf, fmt, ap);
1002         va_end(ap);
1003
1004         packet_writer_error(&data->writer, "%s", buf.buf);
1005         die("%s", buf.buf);
1006 }
1007
1008 static void check_one_filter(struct upload_pack_data *data,
1009                              struct list_objects_filter_options *opts)
1010 {
1011         const char *key = list_object_filter_config_name(opts->choice);
1012         struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1013                                                            key);
1014         int allowed;
1015
1016         if (item)
1017                 allowed = (intptr_t)item->util;
1018         else
1019                 allowed = data->allow_filter_fallback;
1020
1021         if (!allowed)
1022                 send_err_and_die(data, "filter '%s' not supported", key);
1023
1024         if (opts->choice == LOFC_TREE_DEPTH &&
1025             opts->tree_exclude_depth > data->tree_filter_max_depth)
1026                 send_err_and_die(data,
1027                                  "tree filter allows max depth %lu, but got %lu",
1028                                  data->tree_filter_max_depth,
1029                                  opts->tree_exclude_depth);
1030 }
1031
1032 static void check_filter_recurse(struct upload_pack_data *data,
1033                                  struct list_objects_filter_options *opts)
1034 {
1035         size_t i;
1036
1037         check_one_filter(data, opts);
1038         if (opts->choice != LOFC_COMBINE)
1039                 return;
1040
1041         for (i = 0; i < opts->sub_nr; i++)
1042                 check_filter_recurse(data, &opts->sub[i]);
1043 }
1044
1045 static void die_if_using_banned_filter(struct upload_pack_data *data)
1046 {
1047         check_filter_recurse(data, &data->filter_options);
1048 }
1049
1050 static void receive_needs(struct upload_pack_data *data,
1051                           struct packet_reader *reader)
1052 {
1053         int has_non_tip = 0;
1054
1055         data->shallow_nr = 0;
1056         for (;;) {
1057                 struct object *o;
1058                 const char *features;
1059                 struct object_id oid_buf;
1060                 const char *arg;
1061
1062                 reset_timeout(data->timeout);
1063                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1064                         break;
1065
1066                 if (process_shallow(reader->line, &data->shallows))
1067                         continue;
1068                 if (process_deepen(reader->line, &data->depth))
1069                         continue;
1070                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1071                         continue;
1072                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1073                         continue;
1074
1075                 if (skip_prefix(reader->line, "filter ", &arg)) {
1076                         if (!data->filter_capability_requested)
1077                                 die("git upload-pack: filtering capability not negotiated");
1078                         list_objects_filter_die_if_populated(&data->filter_options);
1079                         parse_list_objects_filter(&data->filter_options, arg);
1080                         die_if_using_banned_filter(data);
1081                         continue;
1082                 }
1083
1084                 if (!skip_prefix(reader->line, "want ", &arg) ||
1085                     parse_oid_hex(arg, &oid_buf, &features))
1086                         die("git upload-pack: protocol error, "
1087                             "expected to get object ID, not '%s'", reader->line);
1088
1089                 if (parse_feature_request(features, "deepen-relative"))
1090                         data->deepen_relative = 1;
1091                 if (parse_feature_request(features, "multi_ack_detailed"))
1092                         data->multi_ack = MULTI_ACK_DETAILED;
1093                 else if (parse_feature_request(features, "multi_ack"))
1094                         data->multi_ack = MULTI_ACK;
1095                 if (parse_feature_request(features, "no-done"))
1096                         data->no_done = 1;
1097                 if (parse_feature_request(features, "thin-pack"))
1098                         data->use_thin_pack = 1;
1099                 if (parse_feature_request(features, "ofs-delta"))
1100                         data->use_ofs_delta = 1;
1101                 if (parse_feature_request(features, "side-band-64k"))
1102                         data->use_sideband = LARGE_PACKET_MAX;
1103                 else if (parse_feature_request(features, "side-band"))
1104                         data->use_sideband = DEFAULT_PACKET_MAX;
1105                 if (parse_feature_request(features, "no-progress"))
1106                         data->no_progress = 1;
1107                 if (parse_feature_request(features, "include-tag"))
1108                         data->use_include_tag = 1;
1109                 if (data->allow_filter &&
1110                     parse_feature_request(features, "filter"))
1111                         data->filter_capability_requested = 1;
1112
1113                 o = parse_object(the_repository, &oid_buf);
1114                 if (!o) {
1115                         packet_writer_error(&data->writer,
1116                                             "upload-pack: not our ref %s",
1117                                             oid_to_hex(&oid_buf));
1118                         die("git upload-pack: not our ref %s",
1119                             oid_to_hex(&oid_buf));
1120                 }
1121                 if (!(o->flags & WANTED)) {
1122                         o->flags |= WANTED;
1123                         if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1124                               || is_our_ref(o, data->allow_uor)))
1125                                 has_non_tip = 1;
1126                         add_object_array(o, NULL, &data->want_obj);
1127                 }
1128         }
1129
1130         /*
1131          * We have sent all our refs already, and the other end
1132          * should have chosen out of them. When we are operating
1133          * in the stateless RPC mode, however, their choice may
1134          * have been based on the set of older refs advertised
1135          * by another process that handled the initial request.
1136          */
1137         if (has_non_tip)
1138                 check_non_tip(data);
1139
1140         if (!data->use_sideband && data->daemon_mode)
1141                 data->no_progress = 1;
1142
1143         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1144                 return;
1145
1146         if (send_shallow_list(data))
1147                 packet_flush(1);
1148 }
1149
1150 /* return non-zero if the ref is hidden, otherwise 0 */
1151 static int mark_our_ref(const char *refname, const char *refname_full,
1152                         const struct object_id *oid)
1153 {
1154         struct object *o = lookup_unknown_object(oid);
1155
1156         if (ref_is_hidden(refname, refname_full)) {
1157                 o->flags |= HIDDEN_REF;
1158                 return 1;
1159         }
1160         o->flags |= OUR_REF;
1161         return 0;
1162 }
1163
1164 static int check_ref(const char *refname_full, const struct object_id *oid,
1165                      int flag, void *cb_data)
1166 {
1167         const char *refname = strip_namespace(refname_full);
1168
1169         mark_our_ref(refname, refname_full, oid);
1170         return 0;
1171 }
1172
1173 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1174 {
1175         struct string_list_item *item;
1176
1177         if (!symref->nr)
1178                 return;
1179         for_each_string_list_item(item, symref)
1180                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1181 }
1182
1183 static int send_ref(const char *refname, const struct object_id *oid,
1184                     int flag, void *cb_data)
1185 {
1186         static const char *capabilities = "multi_ack thin-pack side-band"
1187                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1188                 " deepen-relative no-progress include-tag multi_ack_detailed";
1189         const char *refname_nons = strip_namespace(refname);
1190         struct object_id peeled;
1191         struct upload_pack_data *data = cb_data;
1192
1193         if (mark_our_ref(refname_nons, refname, oid))
1194                 return 0;
1195
1196         if (capabilities) {
1197                 struct strbuf symref_info = STRBUF_INIT;
1198
1199                 format_symref_info(&symref_info, &data->symref);
1200                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s object-format=%s agent=%s\n",
1201                              oid_to_hex(oid), refname_nons,
1202                              0, capabilities,
1203                              (data->allow_uor & ALLOW_TIP_SHA1) ?
1204                                      " allow-tip-sha1-in-want" : "",
1205                              (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1206                                      " allow-reachable-sha1-in-want" : "",
1207                              data->stateless_rpc ? " no-done" : "",
1208                              symref_info.buf,
1209                              data->allow_filter ? " filter" : "",
1210                              the_hash_algo->name,
1211                              git_user_agent_sanitized());
1212                 strbuf_release(&symref_info);
1213         } else {
1214                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1215         }
1216         capabilities = NULL;
1217         if (!peel_ref(refname, &peeled))
1218                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1219         return 0;
1220 }
1221
1222 static int find_symref(const char *refname, const struct object_id *oid,
1223                        int flag, void *cb_data)
1224 {
1225         const char *symref_target;
1226         struct string_list_item *item;
1227
1228         if ((flag & REF_ISSYMREF) == 0)
1229                 return 0;
1230         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1231         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1232                 die("'%s' is a symref but it is not?", refname);
1233         item = string_list_append(cb_data, strip_namespace(refname));
1234         item->util = xstrdup(strip_namespace(symref_target));
1235         return 0;
1236 }
1237
1238 static int parse_object_filter_config(const char *var, const char *value,
1239                                        struct upload_pack_data *data)
1240 {
1241         struct strbuf buf = STRBUF_INIT;
1242         const char *sub, *key;
1243         size_t sub_len;
1244
1245         if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1246                 return 0;
1247
1248         if (!sub) {
1249                 if (!strcmp(key, "allow"))
1250                         data->allow_filter_fallback = git_config_bool(var, value);
1251                 return 0;
1252         }
1253
1254         strbuf_add(&buf, sub, sub_len);
1255
1256         if (!strcmp(key, "allow"))
1257                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1258                         (void *)(intptr_t)git_config_bool(var, value);
1259         else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1260                 if (!value) {
1261                         strbuf_release(&buf);
1262                         return config_error_nonbool(var);
1263                 }
1264                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1265                         (void *)(intptr_t)1;
1266                 data->tree_filter_max_depth = git_config_ulong(var, value);
1267         }
1268
1269         strbuf_release(&buf);
1270         return 0;
1271 }
1272
1273 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1274 {
1275         struct upload_pack_data *data = cb_data;
1276
1277         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1278                 if (git_config_bool(var, value))
1279                         data->allow_uor |= ALLOW_TIP_SHA1;
1280                 else
1281                         data->allow_uor &= ~ALLOW_TIP_SHA1;
1282         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1283                 if (git_config_bool(var, value))
1284                         data->allow_uor |= ALLOW_REACHABLE_SHA1;
1285                 else
1286                         data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1287         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1288                 if (git_config_bool(var, value))
1289                         data->allow_uor |= ALLOW_ANY_SHA1;
1290                 else
1291                         data->allow_uor &= ~ALLOW_ANY_SHA1;
1292         } else if (!strcmp("uploadpack.keepalive", var)) {
1293                 data->keepalive = git_config_int(var, value);
1294                 if (!data->keepalive)
1295                         data->keepalive = -1;
1296         } else if (!strcmp("uploadpack.allowfilter", var)) {
1297                 data->allow_filter = git_config_bool(var, value);
1298         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1299                 data->allow_ref_in_want = git_config_bool(var, value);
1300         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1301                 data->allow_sideband_all = git_config_bool(var, value);
1302         } else if (!strcmp("core.precomposeunicode", var)) {
1303                 precomposed_unicode = git_config_bool(var, value);
1304         }
1305
1306         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1307         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1308                 if (!strcmp("uploadpack.packobjectshook", var))
1309                         return git_config_string(&data->pack_objects_hook, var, value);
1310         }
1311
1312         parse_object_filter_config(var, value, data);
1313
1314         return parse_hide_refs_config(var, value, "uploadpack");
1315 }
1316
1317 void upload_pack(struct upload_pack_options *options)
1318 {
1319         struct packet_reader reader;
1320         struct upload_pack_data data;
1321
1322         upload_pack_data_init(&data);
1323
1324         git_config(upload_pack_config, &data);
1325
1326         data.stateless_rpc = options->stateless_rpc;
1327         data.daemon_mode = options->daemon_mode;
1328         data.timeout = options->timeout;
1329
1330         head_ref_namespaced(find_symref, &data.symref);
1331
1332         if (options->advertise_refs || !data.stateless_rpc) {
1333                 reset_timeout(data.timeout);
1334                 head_ref_namespaced(send_ref, &data);
1335                 for_each_namespaced_ref(send_ref, &data);
1336                 advertise_shallow_grafts(1);
1337                 packet_flush(1);
1338         } else {
1339                 head_ref_namespaced(check_ref, NULL);
1340                 for_each_namespaced_ref(check_ref, NULL);
1341         }
1342
1343         if (!options->advertise_refs) {
1344                 packet_reader_init(&reader, 0, NULL, 0,
1345                                    PACKET_READ_CHOMP_NEWLINE |
1346                                    PACKET_READ_DIE_ON_ERR_PACKET);
1347
1348                 receive_needs(&data, &reader);
1349                 if (data.want_obj.nr) {
1350                         get_common_commits(&data, &reader);
1351                         create_pack_file(&data, NULL);
1352                 }
1353         }
1354
1355         upload_pack_data_clear(&data);
1356 }
1357
1358 static int parse_want(struct packet_writer *writer, const char *line,
1359                       struct object_array *want_obj)
1360 {
1361         const char *arg;
1362         if (skip_prefix(line, "want ", &arg)) {
1363                 struct object_id oid;
1364                 struct object *o;
1365
1366                 if (get_oid_hex(arg, &oid))
1367                         die("git upload-pack: protocol error, "
1368                             "expected to get oid, not '%s'", line);
1369
1370                 o = parse_object(the_repository, &oid);
1371                 if (!o) {
1372                         packet_writer_error(writer,
1373                                             "upload-pack: not our ref %s",
1374                                             oid_to_hex(&oid));
1375                         die("git upload-pack: not our ref %s",
1376                             oid_to_hex(&oid));
1377                 }
1378
1379                 if (!(o->flags & WANTED)) {
1380                         o->flags |= WANTED;
1381                         add_object_array(o, NULL, want_obj);
1382                 }
1383
1384                 return 1;
1385         }
1386
1387         return 0;
1388 }
1389
1390 static int parse_want_ref(struct packet_writer *writer, const char *line,
1391                           struct string_list *wanted_refs,
1392                           struct object_array *want_obj)
1393 {
1394         const char *arg;
1395         if (skip_prefix(line, "want-ref ", &arg)) {
1396                 struct object_id oid;
1397                 struct string_list_item *item;
1398                 struct object *o;
1399
1400                 if (read_ref(arg, &oid)) {
1401                         packet_writer_error(writer, "unknown ref %s", arg);
1402                         die("unknown ref %s", arg);
1403                 }
1404
1405                 item = string_list_append(wanted_refs, arg);
1406                 item->util = oiddup(&oid);
1407
1408                 o = parse_object_or_die(&oid, arg);
1409                 if (!(o->flags & WANTED)) {
1410                         o->flags |= WANTED;
1411                         add_object_array(o, NULL, want_obj);
1412                 }
1413
1414                 return 1;
1415         }
1416
1417         return 0;
1418 }
1419
1420 static int parse_have(const char *line, struct oid_array *haves)
1421 {
1422         const char *arg;
1423         if (skip_prefix(line, "have ", &arg)) {
1424                 struct object_id oid;
1425
1426                 if (get_oid_hex(arg, &oid))
1427                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1428                 oid_array_append(haves, &oid);
1429                 return 1;
1430         }
1431
1432         return 0;
1433 }
1434
1435 static void process_args(struct packet_reader *request,
1436                          struct upload_pack_data *data)
1437 {
1438         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1439                 const char *arg = request->line;
1440                 const char *p;
1441
1442                 /* process want */
1443                 if (parse_want(&data->writer, arg, &data->want_obj))
1444                         continue;
1445                 if (data->allow_ref_in_want &&
1446                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1447                                    &data->want_obj))
1448                         continue;
1449                 /* process have line */
1450                 if (parse_have(arg, &data->haves))
1451                         continue;
1452
1453                 /* process args like thin-pack */
1454                 if (!strcmp(arg, "thin-pack")) {
1455                         data->use_thin_pack = 1;
1456                         continue;
1457                 }
1458                 if (!strcmp(arg, "ofs-delta")) {
1459                         data->use_ofs_delta = 1;
1460                         continue;
1461                 }
1462                 if (!strcmp(arg, "no-progress")) {
1463                         data->no_progress = 1;
1464                         continue;
1465                 }
1466                 if (!strcmp(arg, "include-tag")) {
1467                         data->use_include_tag = 1;
1468                         continue;
1469                 }
1470                 if (!strcmp(arg, "done")) {
1471                         data->done = 1;
1472                         continue;
1473                 }
1474
1475                 /* Shallow related arguments */
1476                 if (process_shallow(arg, &data->shallows))
1477                         continue;
1478                 if (process_deepen(arg, &data->depth))
1479                         continue;
1480                 if (process_deepen_since(arg, &data->deepen_since,
1481                                          &data->deepen_rev_list))
1482                         continue;
1483                 if (process_deepen_not(arg, &data->deepen_not,
1484                                        &data->deepen_rev_list))
1485                         continue;
1486                 if (!strcmp(arg, "deepen-relative")) {
1487                         data->deepen_relative = 1;
1488                         continue;
1489                 }
1490
1491                 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1492                         list_objects_filter_die_if_populated(&data->filter_options);
1493                         parse_list_objects_filter(&data->filter_options, p);
1494                         die_if_using_banned_filter(data);
1495                         continue;
1496                 }
1497
1498                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1499                      data->allow_sideband_all) &&
1500                     !strcmp(arg, "sideband-all")) {
1501                         data->writer.use_sideband = 1;
1502                         continue;
1503                 }
1504
1505                 if (skip_prefix(arg, "packfile-uris ", &p)) {
1506                         string_list_split(&data->uri_protocols, p, ',', -1);
1507                         continue;
1508                 }
1509
1510                 /* ignore unknown lines maybe? */
1511                 die("unexpected line: '%s'", arg);
1512         }
1513
1514         if (data->uri_protocols.nr && !data->writer.use_sideband)
1515                 string_list_clear(&data->uri_protocols, 0);
1516
1517         if (request->status != PACKET_READ_FLUSH)
1518                 die(_("expected flush after fetch arguments"));
1519 }
1520
1521 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1522 {
1523         int i;
1524
1525         /* Process haves */
1526         for (i = 0; i < data->haves.nr; i++) {
1527                 const struct object_id *oid = &data->haves.oid[i];
1528
1529                 if (!has_object_file_with_flags(oid,
1530                                                 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1531                         continue;
1532
1533                 oid_array_append(common, oid);
1534
1535                 do_got_oid(data, oid);
1536         }
1537
1538         return 0;
1539 }
1540
1541 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1542 {
1543         int i;
1544
1545         packet_writer_write(&data->writer, "acknowledgments\n");
1546
1547         /* Send Acks */
1548         if (!acks->nr)
1549                 packet_writer_write(&data->writer, "NAK\n");
1550
1551         for (i = 0; i < acks->nr; i++) {
1552                 packet_writer_write(&data->writer, "ACK %s\n",
1553                                     oid_to_hex(&acks->oid[i]));
1554         }
1555
1556         if (ok_to_give_up(data)) {
1557                 /* Send Ready */
1558                 packet_writer_write(&data->writer, "ready\n");
1559                 return 1;
1560         }
1561
1562         return 0;
1563 }
1564
1565 static int process_haves_and_send_acks(struct upload_pack_data *data)
1566 {
1567         struct oid_array common = OID_ARRAY_INIT;
1568         int ret = 0;
1569
1570         process_haves(data, &common);
1571         if (data->done) {
1572                 ret = 1;
1573         } else if (send_acks(data, &common)) {
1574                 packet_writer_delim(&data->writer);
1575                 ret = 1;
1576         } else {
1577                 /* Add Flush */
1578                 packet_writer_flush(&data->writer);
1579                 ret = 0;
1580         }
1581
1582         oid_array_clear(&data->haves);
1583         oid_array_clear(&common);
1584         return ret;
1585 }
1586
1587 static void send_wanted_ref_info(struct upload_pack_data *data)
1588 {
1589         const struct string_list_item *item;
1590
1591         if (!data->wanted_refs.nr)
1592                 return;
1593
1594         packet_writer_write(&data->writer, "wanted-refs\n");
1595
1596         for_each_string_list_item(item, &data->wanted_refs) {
1597                 packet_writer_write(&data->writer, "%s %s\n",
1598                                     oid_to_hex(item->util),
1599                                     item->string);
1600         }
1601
1602         packet_writer_delim(&data->writer);
1603 }
1604
1605 static void send_shallow_info(struct upload_pack_data *data)
1606 {
1607         /* No shallow info needs to be sent */
1608         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1609             !is_repository_shallow(the_repository))
1610                 return;
1611
1612         packet_writer_write(&data->writer, "shallow-info\n");
1613
1614         if (!send_shallow_list(data) &&
1615             is_repository_shallow(the_repository))
1616                 deepen(data, INFINITE_DEPTH);
1617
1618         packet_delim(1);
1619 }
1620
1621 enum fetch_state {
1622         FETCH_PROCESS_ARGS = 0,
1623         FETCH_SEND_ACKS,
1624         FETCH_SEND_PACK,
1625         FETCH_DONE,
1626 };
1627
1628 int upload_pack_v2(struct repository *r, struct strvec *keys,
1629                    struct packet_reader *request)
1630 {
1631         enum fetch_state state = FETCH_PROCESS_ARGS;
1632         struct upload_pack_data data;
1633
1634         clear_object_flags(ALL_FLAGS);
1635
1636         upload_pack_data_init(&data);
1637         data.use_sideband = LARGE_PACKET_MAX;
1638
1639         git_config(upload_pack_config, &data);
1640
1641         while (state != FETCH_DONE) {
1642                 switch (state) {
1643                 case FETCH_PROCESS_ARGS:
1644                         process_args(request, &data);
1645
1646                         if (!data.want_obj.nr) {
1647                                 /*
1648                                  * Request didn't contain any 'want' lines,
1649                                  * guess they didn't want anything.
1650                                  */
1651                                 state = FETCH_DONE;
1652                         } else if (data.haves.nr) {
1653                                 /*
1654                                  * Request had 'have' lines, so lets ACK them.
1655                                  */
1656                                 state = FETCH_SEND_ACKS;
1657                         } else {
1658                                 /*
1659                                  * Request had 'want's but no 'have's so we can
1660                                  * immedietly go to construct and send a pack.
1661                                  */
1662                                 state = FETCH_SEND_PACK;
1663                         }
1664                         break;
1665                 case FETCH_SEND_ACKS:
1666                         if (process_haves_and_send_acks(&data))
1667                                 state = FETCH_SEND_PACK;
1668                         else
1669                                 state = FETCH_DONE;
1670                         break;
1671                 case FETCH_SEND_PACK:
1672                         send_wanted_ref_info(&data);
1673                         send_shallow_info(&data);
1674
1675                         if (data.uri_protocols.nr) {
1676                                 create_pack_file(&data, &data.uri_protocols);
1677                         } else {
1678                                 packet_writer_write(&data.writer, "packfile\n");
1679                                 create_pack_file(&data, NULL);
1680                         }
1681                         state = FETCH_DONE;
1682                         break;
1683                 case FETCH_DONE:
1684                         continue;
1685                 }
1686         }
1687
1688         upload_pack_data_clear(&data);
1689         return 0;
1690 }
1691
1692 int upload_pack_advertise(struct repository *r,
1693                           struct strbuf *value)
1694 {
1695         if (value) {
1696                 int allow_filter_value;
1697                 int allow_ref_in_want;
1698                 int allow_sideband_all_value;
1699                 char *str = NULL;
1700
1701                 strbuf_addstr(value, "shallow");
1702
1703                 if (!repo_config_get_bool(the_repository,
1704                                          "uploadpack.allowfilter",
1705                                          &allow_filter_value) &&
1706                     allow_filter_value)
1707                         strbuf_addstr(value, " filter");
1708
1709                 if (!repo_config_get_bool(the_repository,
1710                                          "uploadpack.allowrefinwant",
1711                                          &allow_ref_in_want) &&
1712                     allow_ref_in_want)
1713                         strbuf_addstr(value, " ref-in-want");
1714
1715                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1716                     (!repo_config_get_bool(the_repository,
1717                                            "uploadpack.allowsidebandall",
1718                                            &allow_sideband_all_value) &&
1719                      allow_sideband_all_value))
1720                         strbuf_addstr(value, " sideband-all");
1721
1722                 if (!repo_config_get_string(the_repository,
1723                                             "uploadpack.blobpackfileuri",
1724                                             &str) &&
1725                     str) {
1726                         strbuf_addstr(value, " packfile-uris");
1727                         free(str);
1728                 }
1729         }
1730
1731         return 1;
1732 }