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         sigchain_pop(SIGPIPE);
 743         if (cmd.out >= 0)
 744                 close(cmd.out);
 745         return 1;
 746 }
 747
 748 static void check_non_tip(struct upload_pack_data *data)
 749 {
 750         int i;
 751
 752         /*
 753          * In the normal in-process case without
 754          * uploadpack.allowReachableSHA1InWant,
 755          * non-tip requests can never happen.
 756          */
 757         if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
 758                 goto error;
 759         if (!has_unreachable(&data->want_obj, data->allow_uor))
 760                 /* All the non-tip ones are ancestors of what we advertised */
 761                 return;
 762
 763 error:
 764         /* Pick one of them (we know there at least is one) */
 765         for (i = 0; i < data->want_obj.nr; i++) {
 766                 struct object *o = data->want_obj.objects[i].item;
 767                 if (!is_our_ref(o, data->allow_uor)) {
 768                         packet_writer_error(&data->writer,
 769                                             "upload-pack: not our ref %s",
 770                                             oid_to_hex(&o->oid));
 771                         die("git upload-pack: not our ref %s",
 772                             oid_to_hex(&o->oid));
 773                 }
 774         }
 775 }
 776
 777 static void send_shallow(struct upload_pack_data *data,
 778                          struct commit_list *result)
 779 {
 780         while (result) {
 781                 struct object *object = &result->item->object;
 782                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 783                         packet_writer_write(&data->writer, "shallow %s",
 784                                             oid_to_hex(&object->oid));
 785                         register_shallow(the_repository, &object->oid);
 786                         data->shallow_nr++;
 787                 }
 788                 result = result->next;
 789         }
 790 }
 791
 792 static void send_unshallow(struct upload_pack_data *data)
 793 {
 794         int i;
 795
 796         for (i = 0; i < data->shallows.nr; i++) {
 797                 struct object *object = data->shallows.objects[i].item;
 798                 if (object->flags & NOT_SHALLOW) {
 799                         struct commit_list *parents;
 800                         packet_writer_write(&data->writer, "unshallow %s",
 801                                             oid_to_hex(&object->oid));
 802                         object->flags &= ~CLIENT_SHALLOW;
 803                         /*
 804                          * We want to _register_ "object" as shallow, but we
 805                          * also need to traverse object's parents to deepen a
 806                          * shallow clone. Unregister it for now so we can
 807                          * parse and add the parents to the want list, then
 808                          * re-register it.
 809                          */
 810                         unregister_shallow(&object->oid);
 811                         object->parsed = 0;
 812                         parse_commit_or_die((struct commit *)object);
 813                         parents = ((struct commit *)object)->parents;
 814                         while (parents) {
 815                                 add_object_array(&parents->item->object,
 816                                                  NULL, &data->want_obj);
 817                                 parents = parents->next;
 818                         }
 819                         add_object_array(object, NULL, &data->extra_edge_obj);
 820                 }
 821                 /* make sure commit traversal conforms to client */
 822                 register_shallow(the_repository, &object->oid);
 823         }
 824 }
 825
 826 static int check_ref(const char *refname_full, const struct object_id *oid,
 827                      int flag, void *cb_data);
 828 static void deepen(struct upload_pack_data *data, int depth)
 829 {
 830         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 831                 int i;
 832
 833                 for (i = 0; i < data->shallows.nr; i++) {
 834                         struct object *object = data->shallows.objects[i].item;
 835                         object->flags |= NOT_SHALLOW;
 836                 }
 837         } else if (data->deepen_relative) {
 838                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 839                 struct commit_list *result;
 840
 841                 /*
 842                  * Checking for reachable shallows requires that our refs be
 843                  * marked with OUR_REF.
 844                  */
 845                 head_ref_namespaced(check_ref, NULL);
 846                 for_each_namespaced_ref(check_ref, NULL);
 847
 848                 get_reachable_list(data, &reachable_shallows);
 849                 result = get_shallow_commits(&reachable_shallows,
 850                                              depth + 1,
 851                                              SHALLOW, NOT_SHALLOW);
 852                 send_shallow(data, result);
 853                 free_commit_list(result);
 854                 object_array_clear(&reachable_shallows);
 855         } else {
 856                 struct commit_list *result;
 857
 858                 result = get_shallow_commits(&data->want_obj, depth,
 859                                              SHALLOW, NOT_SHALLOW);
 860                 send_shallow(data, result);
 861                 free_commit_list(result);
 862         }
 863
 864         send_unshallow(data);
 865 }
 866
 867 static void deepen_by_rev_list(struct upload_pack_data *data,
 868                                int ac,
 869                                const char **av)
 870 {
 871         struct commit_list *result;
 872
 873         disable_commit_graph(the_repository);
 874         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 875         send_shallow(data, result);
 876         free_commit_list(result);
 877         send_unshallow(data);
 878 }
 879
 880 /* Returns 1 if a shallow list is sent or 0 otherwise */
 881 static int send_shallow_list(struct upload_pack_data *data)
 882 {
 883         int ret = 0;
 884
 885         if (data->depth > 0 && data->deepen_rev_list)
 886                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 887         if (data->depth > 0) {
 888                 deepen(data, data->depth);
 889                 ret = 1;
 890         } else if (data->deepen_rev_list) {
 891                 struct strvec av = STRVEC_INIT;
 892                 int i;
 893
 894                 strvec_push(&av, "rev-list");
 895                 if (data->deepen_since)
 896                         strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
 897                 if (data->deepen_not.nr) {
 898                         strvec_push(&av, "--not");
 899                         for (i = 0; i < data->deepen_not.nr; i++) {
 900                                 struct string_list_item *s = data->deepen_not.items + i;
 901                                 strvec_push(&av, s->string);
 902                         }
 903                         strvec_push(&av, "--not");
 904                 }
 905                 for (i = 0; i < data->want_obj.nr; i++) {
 906                         struct object *o = data->want_obj.objects[i].item;
 907                         strvec_push(&av, oid_to_hex(&o->oid));
 908                 }
 909                 deepen_by_rev_list(data, av.nr, av.v);
 910                 strvec_clear(&av);
 911                 ret = 1;
 912         } else {
 913                 if (data->shallows.nr > 0) {
 914                         int i;
 915                         for (i = 0; i < data->shallows.nr; i++)
 916                                 register_shallow(the_repository,
 917                                                  &data->shallows.objects[i].item->oid);
 918                 }
 919         }
 920
 921         data->shallow_nr += data->shallows.nr;
 922         return ret;
 923 }
 924
 925 static int process_shallow(const char *line, struct object_array *shallows)
 926 {
 927         const char *arg;
 928         if (skip_prefix(line, "shallow ", &arg)) {
 929                 struct object_id oid;
 930                 struct object *object;
 931                 if (get_oid_hex(arg, &oid))
 932                         die("invalid shallow line: %s", line);
 933                 object = parse_object(the_repository, &oid);
 934                 if (!object)
 935                         return 1;
 936                 if (object->type != OBJ_COMMIT)
 937                         die("invalid shallow object %s", oid_to_hex(&oid));
 938                 if (!(object->flags & CLIENT_SHALLOW)) {
 939                         object->flags |= CLIENT_SHALLOW;
 940                         add_object_array(object, NULL, shallows);
 941                 }
 942                 return 1;
 943         }
 944
 945         return 0;
 946 }
 947
 948 static int process_deepen(const char *line, int *depth)
 949 {
 950         const char *arg;
 951         if (skip_prefix(line, "deepen ", &arg)) {
 952                 char *end = NULL;
 953                 *depth = (int)strtol(arg, &end, 0);
 954                 if (!end || *end || *depth <= 0)
 955                         die("Invalid deepen: %s", line);
 956                 return 1;
 957         }
 958
 959         return 0;
 960 }
 961
 962 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 963 {
 964         const char *arg;
 965         if (skip_prefix(line, "deepen-since ", &arg)) {
 966                 char *end = NULL;
 967                 *deepen_since = parse_timestamp(arg, &end, 0);
 968                 if (!end || *end || !deepen_since ||
 969                     /* revisions.c's max_age -1 is special */
 970                     *deepen_since == -1)
 971                         die("Invalid deepen-since: %s", line);
 972                 *deepen_rev_list = 1;
 973                 return 1;
 974         }
 975         return 0;
 976 }
 977
 978 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 979 {
 980         const char *arg;
 981         if (skip_prefix(line, "deepen-not ", &arg)) {
 982                 char *ref = NULL;
 983                 struct object_id oid;
 984                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 985                         die("git upload-pack: ambiguous deepen-not: %s", line);
 986                 string_list_append(deepen_not, ref);
 987                 free(ref);
 988                 *deepen_rev_list = 1;
 989                 return 1;
 990         }
 991         return 0;
 992 }
 993
 994 NORETURN __attribute__((format(printf,2,3)))
 995 static void send_err_and_die(struct upload_pack_data *data,
 996                              const char *fmt, ...)
 997 {
 998         struct strbuf buf = STRBUF_INIT;
 999         va_list ap;
1000
1001         va_start(ap, fmt);
1002         strbuf_vaddf(&buf, fmt, ap);
1003         va_end(ap);
1004
1005         packet_writer_error(&data->writer, "%s", buf.buf);
1006         die("%s", buf.buf);
1007 }
1008
1009 static void check_one_filter(struct upload_pack_data *data,
1010                              struct list_objects_filter_options *opts)
1011 {
1012         const char *key = list_object_filter_config_name(opts->choice);
1013         struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1014                                                            key);
1015         int allowed;
1016
1017         if (item)
1018                 allowed = (intptr_t)item->util;
1019         else
1020                 allowed = data->allow_filter_fallback;
1021
1022         if (!allowed)
1023                 send_err_and_die(data, "filter '%s' not supported", key);
1024
1025         if (opts->choice == LOFC_TREE_DEPTH &&
1026             opts->tree_exclude_depth > data->tree_filter_max_depth)
1027                 send_err_and_die(data,
1028                                  "tree filter allows max depth %lu, but got %lu",
1029                                  data->tree_filter_max_depth,
1030                                  opts->tree_exclude_depth);
1031 }
1032
1033 static void check_filter_recurse(struct upload_pack_data *data,
1034                                  struct list_objects_filter_options *opts)
1035 {
1036         size_t i;
1037
1038         check_one_filter(data, opts);
1039         if (opts->choice != LOFC_COMBINE)
1040                 return;
1041
1042         for (i = 0; i < opts->sub_nr; i++)
1043                 check_filter_recurse(data, &opts->sub[i]);
1044 }
1045
1046 static void die_if_using_banned_filter(struct upload_pack_data *data)
1047 {
1048         check_filter_recurse(data, &data->filter_options);
1049 }
1050
1051 static void receive_needs(struct upload_pack_data *data,
1052                           struct packet_reader *reader)
1053 {
1054         int has_non_tip = 0;
1055
1056         data->shallow_nr = 0;
1057         for (;;) {
1058                 struct object *o;
1059                 const char *features;
1060                 struct object_id oid_buf;
1061                 const char *arg;
1062
1063                 reset_timeout(data->timeout);
1064                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1065                         break;
1066
1067                 if (process_shallow(reader->line, &data->shallows))
1068                         continue;
1069                 if (process_deepen(reader->line, &data->depth))
1070                         continue;
1071                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1072                         continue;
1073                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1074                         continue;
1075
1076                 if (skip_prefix(reader->line, "filter ", &arg)) {
1077                         if (!data->filter_capability_requested)
1078                                 die("git upload-pack: filtering capability not negotiated");
1079                         list_objects_filter_die_if_populated(&data->filter_options);
1080                         parse_list_objects_filter(&data->filter_options, arg);
1081                         die_if_using_banned_filter(data);
1082                         continue;
1083                 }
1084
1085                 if (!skip_prefix(reader->line, "want ", &arg) ||
1086                     parse_oid_hex(arg, &oid_buf, &features))
1087                         die("git upload-pack: protocol error, "
1088                             "expected to get object ID, not '%s'", reader->line);
1089
1090                 if (parse_feature_request(features, "deepen-relative"))
1091                         data->deepen_relative = 1;
1092                 if (parse_feature_request(features, "multi_ack_detailed"))
1093                         data->multi_ack = MULTI_ACK_DETAILED;
1094                 else if (parse_feature_request(features, "multi_ack"))
1095                         data->multi_ack = MULTI_ACK;
1096                 if (parse_feature_request(features, "no-done"))
1097                         data->no_done = 1;
1098                 if (parse_feature_request(features, "thin-pack"))
1099                         data->use_thin_pack = 1;
1100                 if (parse_feature_request(features, "ofs-delta"))
1101                         data->use_ofs_delta = 1;
1102                 if (parse_feature_request(features, "side-band-64k"))
1103                         data->use_sideband = LARGE_PACKET_MAX;
1104                 else if (parse_feature_request(features, "side-band"))
1105                         data->use_sideband = DEFAULT_PACKET_MAX;
1106                 if (parse_feature_request(features, "no-progress"))
1107                         data->no_progress = 1;
1108                 if (parse_feature_request(features, "include-tag"))
1109                         data->use_include_tag = 1;
1110                 if (data->allow_filter &&
1111                     parse_feature_request(features, "filter"))
1112                         data->filter_capability_requested = 1;
1113
1114                 o = parse_object(the_repository, &oid_buf);
1115                 if (!o) {
1116                         packet_writer_error(&data->writer,
1117                                             "upload-pack: not our ref %s",
1118                                             oid_to_hex(&oid_buf));
1119                         die("git upload-pack: not our ref %s",
1120                             oid_to_hex(&oid_buf));
1121                 }
1122                 if (!(o->flags & WANTED)) {
1123                         o->flags |= WANTED;
1124                         if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1125                               || is_our_ref(o, data->allow_uor)))
1126                                 has_non_tip = 1;
1127                         add_object_array(o, NULL, &data->want_obj);
1128                 }
1129         }
1130
1131         /*
1132          * We have sent all our refs already, and the other end
1133          * should have chosen out of them. When we are operating
1134          * in the stateless RPC mode, however, their choice may
1135          * have been based on the set of older refs advertised
1136          * by another process that handled the initial request.
1137          */
1138         if (has_non_tip)
1139                 check_non_tip(data);
1140
1141         if (!data->use_sideband && data->daemon_mode)
1142                 data->no_progress = 1;
1143
1144         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1145                 return;
1146
1147         if (send_shallow_list(data))
1148                 packet_flush(1);
1149 }
1150
1151 /* return non-zero if the ref is hidden, otherwise 0 */
1152 static int mark_our_ref(const char *refname, const char *refname_full,
1153                         const struct object_id *oid)
1154 {
1155         struct object *o = lookup_unknown_object(oid);
1156
1157         if (ref_is_hidden(refname, refname_full)) {
1158                 o->flags |= HIDDEN_REF;
1159                 return 1;
1160         }
1161         o->flags |= OUR_REF;
1162         return 0;
1163 }
1164
1165 static int check_ref(const char *refname_full, const struct object_id *oid,
1166                      int flag, void *cb_data)
1167 {
1168         const char *refname = strip_namespace(refname_full);
1169
1170         mark_our_ref(refname, refname_full, oid);
1171         return 0;
1172 }
1173
1174 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1175 {
1176         struct string_list_item *item;
1177
1178         if (!symref->nr)
1179                 return;
1180         for_each_string_list_item(item, symref)
1181                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1182 }
1183
1184 static int send_ref(const char *refname, const struct object_id *oid,
1185                     int flag, void *cb_data)
1186 {
1187         static const char *capabilities = "multi_ack thin-pack side-band"
1188                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1189                 " deepen-relative no-progress include-tag multi_ack_detailed";
1190         const char *refname_nons = strip_namespace(refname);
1191         struct object_id peeled;
1192         struct upload_pack_data *data = cb_data;
1193
1194         if (mark_our_ref(refname_nons, refname, oid))
1195                 return 0;
1196
1197         if (capabilities) {
1198                 struct strbuf symref_info = STRBUF_INIT;
1199
1200                 format_symref_info(&symref_info, &data->symref);
1201                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s object-format=%s agent=%s\n",
1202                              oid_to_hex(oid), refname_nons,
1203                              0, capabilities,
1204                              (data->allow_uor & ALLOW_TIP_SHA1) ?
1205                                      " allow-tip-sha1-in-want" : "",
1206                              (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1207                                      " allow-reachable-sha1-in-want" : "",
1208                              data->stateless_rpc ? " no-done" : "",
1209                              symref_info.buf,
1210                              data->allow_filter ? " filter" : "",
1211                              the_hash_algo->name,
1212                              git_user_agent_sanitized());
1213                 strbuf_release(&symref_info);
1214         } else {
1215                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1216         }
1217         capabilities = NULL;
1218         if (!peel_ref(refname, &peeled))
1219                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1220         return 0;
1221 }
1222
1223 static int find_symref(const char *refname, const struct object_id *oid,
1224                        int flag, void *cb_data)
1225 {
1226         const char *symref_target;
1227         struct string_list_item *item;
1228
1229         if ((flag & REF_ISSYMREF) == 0)
1230                 return 0;
1231         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1232         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1233                 die("'%s' is a symref but it is not?", refname);
1234         item = string_list_append(cb_data, strip_namespace(refname));
1235         item->util = xstrdup(strip_namespace(symref_target));
1236         return 0;
1237 }
1238
1239 static int parse_object_filter_config(const char *var, const char *value,
1240                                        struct upload_pack_data *data)
1241 {
1242         struct strbuf buf = STRBUF_INIT;
1243         const char *sub, *key;
1244         size_t sub_len;
1245
1246         if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1247                 return 0;
1248
1249         if (!sub) {
1250                 if (!strcmp(key, "allow"))
1251                         data->allow_filter_fallback = git_config_bool(var, value);
1252                 return 0;
1253         }
1254
1255         strbuf_add(&buf, sub, sub_len);
1256
1257         if (!strcmp(key, "allow"))
1258                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1259                         (void *)(intptr_t)git_config_bool(var, value);
1260         else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1261                 if (!value) {
1262                         strbuf_release(&buf);
1263                         return config_error_nonbool(var);
1264                 }
1265                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1266                         (void *)(intptr_t)1;
1267                 data->tree_filter_max_depth = git_config_ulong(var, value);
1268         }
1269
1270         strbuf_release(&buf);
1271         return 0;
1272 }
1273
1274 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1275 {
1276         struct upload_pack_data *data = cb_data;
1277
1278         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1279                 if (git_config_bool(var, value))
1280                         data->allow_uor |= ALLOW_TIP_SHA1;
1281                 else
1282                         data->allow_uor &= ~ALLOW_TIP_SHA1;
1283         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1284                 if (git_config_bool(var, value))
1285                         data->allow_uor |= ALLOW_REACHABLE_SHA1;
1286                 else
1287                         data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1288         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1289                 if (git_config_bool(var, value))
1290                         data->allow_uor |= ALLOW_ANY_SHA1;
1291                 else
1292                         data->allow_uor &= ~ALLOW_ANY_SHA1;
1293         } else if (!strcmp("uploadpack.keepalive", var)) {
1294                 data->keepalive = git_config_int(var, value);
1295                 if (!data->keepalive)
1296                         data->keepalive = -1;
1297         } else if (!strcmp("uploadpack.allowfilter", var)) {
1298                 data->allow_filter = git_config_bool(var, value);
1299         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1300                 data->allow_ref_in_want = git_config_bool(var, value);
1301         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1302                 data->allow_sideband_all = git_config_bool(var, value);
1303         } else if (!strcmp("core.precomposeunicode", var)) {
1304                 precomposed_unicode = git_config_bool(var, value);
1305         }
1306
1307         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1308         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1309                 if (!strcmp("uploadpack.packobjectshook", var))
1310                         return git_config_string(&data->pack_objects_hook, var, value);
1311         }
1312
1313         parse_object_filter_config(var, value, data);
1314
1315         return parse_hide_refs_config(var, value, "uploadpack");
1316 }
1317
1318 void upload_pack(struct upload_pack_options *options)
1319 {
1320         struct packet_reader reader;
1321         struct upload_pack_data data;
1322
1323         upload_pack_data_init(&data);
1324
1325         git_config(upload_pack_config, &data);
1326
1327         data.stateless_rpc = options->stateless_rpc;
1328         data.daemon_mode = options->daemon_mode;
1329         data.timeout = options->timeout;
1330
1331         head_ref_namespaced(find_symref, &data.symref);
1332
1333         if (options->advertise_refs || !data.stateless_rpc) {
1334                 reset_timeout(data.timeout);
1335                 head_ref_namespaced(send_ref, &data);
1336                 for_each_namespaced_ref(send_ref, &data);
1337                 advertise_shallow_grafts(1);
1338                 packet_flush(1);
1339         } else {
1340                 head_ref_namespaced(check_ref, NULL);
1341                 for_each_namespaced_ref(check_ref, NULL);
1342         }
1343
1344         if (!options->advertise_refs) {
1345                 packet_reader_init(&reader, 0, NULL, 0,
1346                                    PACKET_READ_CHOMP_NEWLINE |
1347                                    PACKET_READ_DIE_ON_ERR_PACKET);
1348
1349                 receive_needs(&data, &reader);
1350                 if (data.want_obj.nr) {
1351                         get_common_commits(&data, &reader);
1352                         create_pack_file(&data, NULL);
1353                 }
1354         }
1355
1356         upload_pack_data_clear(&data);
1357 }
1358
1359 static int parse_want(struct packet_writer *writer, const char *line,
1360                       struct object_array *want_obj)
1361 {
1362         const char *arg;
1363         if (skip_prefix(line, "want ", &arg)) {
1364                 struct object_id oid;
1365                 struct object *o;
1366
1367                 if (get_oid_hex(arg, &oid))
1368                         die("git upload-pack: protocol error, "
1369                             "expected to get oid, not '%s'", line);
1370
1371                 o = parse_object(the_repository, &oid);
1372                 if (!o) {
1373                         packet_writer_error(writer,
1374                                             "upload-pack: not our ref %s",
1375                                             oid_to_hex(&oid));
1376                         die("git upload-pack: not our ref %s",
1377                             oid_to_hex(&oid));
1378                 }
1379
1380                 if (!(o->flags & WANTED)) {
1381                         o->flags |= WANTED;
1382                         add_object_array(o, NULL, want_obj);
1383                 }
1384
1385                 return 1;
1386         }
1387
1388         return 0;
1389 }
1390
1391 static int parse_want_ref(struct packet_writer *writer, const char *line,
1392                           struct string_list *wanted_refs,
1393                           struct object_array *want_obj)
1394 {
1395         const char *arg;
1396         if (skip_prefix(line, "want-ref ", &arg)) {
1397                 struct object_id oid;
1398                 struct string_list_item *item;
1399                 struct object *o;
1400
1401                 if (read_ref(arg, &oid)) {
1402                         packet_writer_error(writer, "unknown ref %s", arg);
1403                         die("unknown ref %s", arg);
1404                 }
1405
1406                 item = string_list_append(wanted_refs, arg);
1407                 item->util = oiddup(&oid);
1408
1409                 o = parse_object_or_die(&oid, arg);
1410                 if (!(o->flags & WANTED)) {
1411                         o->flags |= WANTED;
1412                         add_object_array(o, NULL, want_obj);
1413                 }
1414
1415                 return 1;
1416         }
1417
1418         return 0;
1419 }
1420
1421 static int parse_have(const char *line, struct oid_array *haves)
1422 {
1423         const char *arg;
1424         if (skip_prefix(line, "have ", &arg)) {
1425                 struct object_id oid;
1426
1427                 if (get_oid_hex(arg, &oid))
1428                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1429                 oid_array_append(haves, &oid);
1430                 return 1;
1431         }
1432
1433         return 0;
1434 }
1435
1436 static void process_args(struct packet_reader *request,
1437                          struct upload_pack_data *data)
1438 {
1439         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1440                 const char *arg = request->line;
1441                 const char *p;
1442
1443                 /* process want */
1444                 if (parse_want(&data->writer, arg, &data->want_obj))
1445                         continue;
1446                 if (data->allow_ref_in_want &&
1447                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1448                                    &data->want_obj))
1449                         continue;
1450                 /* process have line */
1451                 if (parse_have(arg, &data->haves))
1452                         continue;
1453
1454                 /* process args like thin-pack */
1455                 if (!strcmp(arg, "thin-pack")) {
1456                         data->use_thin_pack = 1;
1457                         continue;
1458                 }
1459                 if (!strcmp(arg, "ofs-delta")) {
1460                         data->use_ofs_delta = 1;
1461                         continue;
1462                 }
1463                 if (!strcmp(arg, "no-progress")) {
1464                         data->no_progress = 1;
1465                         continue;
1466                 }
1467                 if (!strcmp(arg, "include-tag")) {
1468                         data->use_include_tag = 1;
1469                         continue;
1470                 }
1471                 if (!strcmp(arg, "done")) {
1472                         data->done = 1;
1473                         continue;
1474                 }
1475
1476                 /* Shallow related arguments */
1477                 if (process_shallow(arg, &data->shallows))
1478                         continue;
1479                 if (process_deepen(arg, &data->depth))
1480                         continue;
1481                 if (process_deepen_since(arg, &data->deepen_since,
1482                                          &data->deepen_rev_list))
1483                         continue;
1484                 if (process_deepen_not(arg, &data->deepen_not,
1485                                        &data->deepen_rev_list))
1486                         continue;
1487                 if (!strcmp(arg, "deepen-relative")) {
1488                         data->deepen_relative = 1;
1489                         continue;
1490                 }
1491
1492                 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1493                         list_objects_filter_die_if_populated(&data->filter_options);
1494                         parse_list_objects_filter(&data->filter_options, p);
1495                         die_if_using_banned_filter(data);
1496                         continue;
1497                 }
1498
1499                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1500                      data->allow_sideband_all) &&
1501                     !strcmp(arg, "sideband-all")) {
1502                         data->writer.use_sideband = 1;
1503                         continue;
1504                 }
1505
1506                 if (skip_prefix(arg, "packfile-uris ", &p)) {
1507                         string_list_split(&data->uri_protocols, p, ',', -1);
1508                         continue;
1509                 }
1510
1511                 /* ignore unknown lines maybe? */
1512                 die("unexpected line: '%s'", arg);
1513         }
1514
1515         if (data->uri_protocols.nr && !data->writer.use_sideband)
1516                 string_list_clear(&data->uri_protocols, 0);
1517
1518         if (request->status != PACKET_READ_FLUSH)
1519                 die(_("expected flush after fetch arguments"));
1520 }
1521
1522 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1523 {
1524         int i;
1525
1526         /* Process haves */
1527         for (i = 0; i < data->haves.nr; i++) {
1528                 const struct object_id *oid = &data->haves.oid[i];
1529
1530                 if (!has_object_file_with_flags(oid,
1531                                                 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1532                         continue;
1533
1534                 oid_array_append(common, oid);
1535
1536                 do_got_oid(data, oid);
1537         }
1538
1539         return 0;
1540 }
1541
1542 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1543 {
1544         int i;
1545
1546         packet_writer_write(&data->writer, "acknowledgments\n");
1547
1548         /* Send Acks */
1549         if (!acks->nr)
1550                 packet_writer_write(&data->writer, "NAK\n");
1551
1552         for (i = 0; i < acks->nr; i++) {
1553                 packet_writer_write(&data->writer, "ACK %s\n",
1554                                     oid_to_hex(&acks->oid[i]));
1555         }
1556
1557         if (ok_to_give_up(data)) {
1558                 /* Send Ready */
1559                 packet_writer_write(&data->writer, "ready\n");
1560                 return 1;
1561         }
1562
1563         return 0;
1564 }
1565
1566 static int process_haves_and_send_acks(struct upload_pack_data *data)
1567 {
1568         struct oid_array common = OID_ARRAY_INIT;
1569         int ret = 0;
1570
1571         process_haves(data, &common);
1572         if (data->done) {
1573                 ret = 1;
1574         } else if (send_acks(data, &common)) {
1575                 packet_writer_delim(&data->writer);
1576                 ret = 1;
1577         } else {
1578                 /* Add Flush */
1579                 packet_writer_flush(&data->writer);
1580                 ret = 0;
1581         }
1582
1583         oid_array_clear(&data->haves);
1584         oid_array_clear(&common);
1585         return ret;
1586 }
1587
1588 static void send_wanted_ref_info(struct upload_pack_data *data)
1589 {
1590         const struct string_list_item *item;
1591
1592         if (!data->wanted_refs.nr)
1593                 return;
1594
1595         packet_writer_write(&data->writer, "wanted-refs\n");
1596
1597         for_each_string_list_item(item, &data->wanted_refs) {
1598                 packet_writer_write(&data->writer, "%s %s\n",
1599                                     oid_to_hex(item->util),
1600                                     item->string);
1601         }
1602
1603         packet_writer_delim(&data->writer);
1604 }
1605
1606 static void send_shallow_info(struct upload_pack_data *data)
1607 {
1608         /* No shallow info needs to be sent */
1609         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1610             !is_repository_shallow(the_repository))
1611                 return;
1612
1613         packet_writer_write(&data->writer, "shallow-info\n");
1614
1615         if (!send_shallow_list(data) &&
1616             is_repository_shallow(the_repository))
1617                 deepen(data, INFINITE_DEPTH);
1618
1619         packet_delim(1);
1620 }
1621
1622 enum fetch_state {
1623         FETCH_PROCESS_ARGS = 0,
1624         FETCH_SEND_ACKS,
1625         FETCH_SEND_PACK,
1626         FETCH_DONE,
1627 };
1628
1629 int upload_pack_v2(struct repository *r, struct strvec *keys,
1630                    struct packet_reader *request)
1631 {
1632         enum fetch_state state = FETCH_PROCESS_ARGS;
1633         struct upload_pack_data data;
1634
1635         clear_object_flags(ALL_FLAGS);
1636
1637         upload_pack_data_init(&data);
1638         data.use_sideband = LARGE_PACKET_MAX;
1639
1640         git_config(upload_pack_config, &data);
1641
1642         while (state != FETCH_DONE) {
1643                 switch (state) {
1644                 case FETCH_PROCESS_ARGS:
1645                         process_args(request, &data);
1646
1647                         if (!data.want_obj.nr) {
1648                                 /*
1649                                  * Request didn't contain any 'want' lines,
1650                                  * guess they didn't want anything.
1651                                  */
1652                                 state = FETCH_DONE;
1653                         } else if (data.haves.nr) {
1654                                 /*
1655                                  * Request had 'have' lines, so lets ACK them.
1656                                  */
1657                                 state = FETCH_SEND_ACKS;
1658                         } else {
1659                                 /*
1660                                  * Request had 'want's but no 'have's so we can
1661                                  * immedietly go to construct and send a pack.
1662                                  */
1663                                 state = FETCH_SEND_PACK;
1664                         }
1665                         break;
1666                 case FETCH_SEND_ACKS:
1667                         if (process_haves_and_send_acks(&data))
1668                                 state = FETCH_SEND_PACK;
1669                         else
1670                                 state = FETCH_DONE;
1671                         break;
1672                 case FETCH_SEND_PACK:
1673                         send_wanted_ref_info(&data);
1674                         send_shallow_info(&data);
1675
1676                         if (data.uri_protocols.nr) {
1677                                 create_pack_file(&data, &data.uri_protocols);
1678                         } else {
1679                                 packet_writer_write(&data.writer, "packfile\n");
1680                                 create_pack_file(&data, NULL);
1681                         }
1682                         state = FETCH_DONE;
1683                         break;
1684                 case FETCH_DONE:
1685                         continue;
1686                 }
1687         }
1688
1689         upload_pack_data_clear(&data);
1690         return 0;
1691 }
1692
1693 int upload_pack_advertise(struct repository *r,
1694                           struct strbuf *value)
1695 {
1696         if (value) {
1697                 int allow_filter_value;
1698                 int allow_ref_in_want;
1699                 int allow_sideband_all_value;
1700                 char *str = NULL;
1701
1702                 strbuf_addstr(value, "shallow");
1703
1704                 if (!repo_config_get_bool(the_repository,
1705                                          "uploadpack.allowfilter",
1706                                          &allow_filter_value) &&
1707                     allow_filter_value)
1708                         strbuf_addstr(value, " filter");
1709
1710                 if (!repo_config_get_bool(the_repository,
1711                                          "uploadpack.allowrefinwant",
1712                                          &allow_ref_in_want) &&
1713                     allow_ref_in_want)
1714                         strbuf_addstr(value, " ref-in-want");
1715
1716                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1717                     (!repo_config_get_bool(the_repository,
1718                                            "uploadpack.allowsidebandall",
1719                                            &allow_sideband_all_value) &&
1720                      allow_sideband_all_value))
1721                         strbuf_addstr(value, " sideband-all");
1722
1723                 if (!repo_config_get_string(the_repository,
1724                                             "uploadpack.blobpackfileuri",
1725                                             &str) &&
1726                     str) {
1727                         strbuf_addstr(value, " packfile-uris");
1728                         free(str);
1729                 }
1730         }
1731
1732         return 1;
1733 }