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         unsigned advertise_sid : 1;
 114 };
 115
 116 static void upload_pack_data_init(struct upload_pack_data *data)
 117 {
 118         struct string_list symref = STRING_LIST_INIT_DUP;
 119         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 120         struct object_array want_obj = OBJECT_ARRAY_INIT;
 121         struct object_array have_obj = OBJECT_ARRAY_INIT;
 122         struct oid_array haves = OID_ARRAY_INIT;
 123         struct object_array shallows = OBJECT_ARRAY_INIT;
 124         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 125         struct string_list uri_protocols = STRING_LIST_INIT_DUP;
 126         struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
 127         struct string_list allowed_filters = STRING_LIST_INIT_DUP;
 128
 129         memset(data, 0, sizeof(*data));
 130         data->symref = symref;
 131         data->wanted_refs = wanted_refs;
 132         data->want_obj = want_obj;
 133         data->have_obj = have_obj;
 134         data->haves = haves;
 135         data->shallows = shallows;
 136         data->deepen_not = deepen_not;
 137         data->uri_protocols = uri_protocols;
 138         data->extra_edge_obj = extra_edge_obj;
 139         data->allowed_filters = allowed_filters;
 140         data->allow_filter_fallback = 1;
 141         data->tree_filter_max_depth = ULONG_MAX;
 142         packet_writer_init(&data->writer, 1);
 143
 144         data->keepalive = 5;
 145         data->advertise_sid = 0;
 146 }
 147
 148 static void upload_pack_data_clear(struct upload_pack_data *data)
 149 {
 150         string_list_clear(&data->symref, 1);
 151         string_list_clear(&data->wanted_refs, 1);
 152         object_array_clear(&data->want_obj);
 153         object_array_clear(&data->have_obj);
 154         oid_array_clear(&data->haves);
 155         object_array_clear(&data->shallows);
 156         string_list_clear(&data->deepen_not, 0);
 157         object_array_clear(&data->extra_edge_obj);
 158         list_objects_filter_release(&data->filter_options);
 159         string_list_clear(&data->allowed_filters, 0);
 160
 161         free((char *)data->pack_objects_hook);
 162 }
 163
 164 static void reset_timeout(unsigned int timeout)
 165 {
 166         alarm(timeout);
 167 }
 168
 169 static void send_client_data(int fd, const char *data, ssize_t sz,
 170                              int use_sideband)
 171 {
 172         if (use_sideband) {
 173                 send_sideband(1, fd, data, sz, use_sideband);
 174                 return;
 175         }
 176         if (fd == 3)
 177                 /* emergency quit */
 178                 fd = 2;
 179         if (fd == 2) {
 180                 /* XXX: are we happy to lose stuff here? */
 181                 xwrite(fd, data, sz);
 182                 return;
 183         }
 184         write_or_die(fd, data, sz);
 185 }
 186
 187 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 188 {
 189         FILE *fp = cb_data;
 190         if (graft->nr_parent == -1)
 191                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 192         return 0;
 193 }
 194
 195 struct output_state {
 196         char buffer[8193];
 197         int used;
 198         unsigned packfile_uris_started : 1;
 199         unsigned packfile_started : 1;
 200 };
 201
 202 static int relay_pack_data(int pack_objects_out, struct output_state *os,
 203                            int use_sideband, int write_packfile_line)
 204 {
 205         /*
 206          * We keep the last byte to ourselves
 207          * in case we detect broken rev-list, so that we
 208          * can leave the stream corrupted.  This is
 209          * unfortunate -- unpack-objects would happily
 210          * accept a valid packdata with trailing garbage,
 211          * so appending garbage after we pass all the
 212          * pack data is not good enough to signal
 213          * breakage to downstream.
 214          */
 215         ssize_t readsz;
 216
 217         readsz = xread(pack_objects_out, os->buffer + os->used,
 218                        sizeof(os->buffer) - os->used);
 219         if (readsz < 0) {
 220                 return readsz;
 221         }
 222         os->used += readsz;
 223
 224         while (!os->packfile_started) {
 225                 char *p;
 226                 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
 227                         os->packfile_started = 1;
 228                         if (write_packfile_line) {
 229                                 if (os->packfile_uris_started)
 230                                         packet_delim(1);
 231                                 packet_write_fmt(1, "\1packfile\n");
 232                         }
 233                         break;
 234                 }
 235                 if ((p = memchr(os->buffer, '\n', os->used))) {
 236                         if (!os->packfile_uris_started) {
 237                                 os->packfile_uris_started = 1;
 238                                 if (!write_packfile_line)
 239                                         BUG("packfile_uris requires sideband-all");
 240                                 packet_write_fmt(1, "\1packfile-uris\n");
 241                         }
 242                         *p = '\0';
 243                         packet_write_fmt(1, "\1%s\n", os->buffer);
 244
 245                         os->used -= p - os->buffer + 1;
 246                         memmove(os->buffer, p + 1, os->used);
 247                 } else {
 248                         /*
 249                          * Incomplete line.
 250                          */
 251                         return readsz;
 252                 }
 253         }
 254
 255         if (os->used > 1) {
 256                 send_client_data(1, os->buffer, os->used - 1, use_sideband);
 257                 os->buffer[0] = os->buffer[os->used - 1];
 258                 os->used = 1;
 259         } else {
 260                 send_client_data(1, os->buffer, os->used, use_sideband);
 261                 os->used = 0;
 262         }
 263
 264         return readsz;
 265 }
 266
 267 static void create_pack_file(struct upload_pack_data *pack_data,
 268                              const struct string_list *uri_protocols)
 269 {
 270         struct child_process pack_objects = CHILD_PROCESS_INIT;
 271         struct output_state output_state = { { 0 } };
 272         char progress[128];
 273         char abort_msg[] = "aborting due to possible repository "
 274                 "corruption on the remote side.";
 275         ssize_t sz;
 276         int i;
 277         FILE *pipe_fd;
 278
 279         if (!pack_data->pack_objects_hook)
 280                 pack_objects.git_cmd = 1;
 281         else {
 282                 strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
 283                 strvec_push(&pack_objects.args, "git");
 284                 pack_objects.use_shell = 1;
 285         }
 286
 287         if (pack_data->shallow_nr) {
 288                 strvec_push(&pack_objects.args, "--shallow-file");
 289                 strvec_push(&pack_objects.args, "");
 290         }
 291         strvec_push(&pack_objects.args, "pack-objects");
 292         strvec_push(&pack_objects.args, "--revs");
 293         if (pack_data->use_thin_pack)
 294                 strvec_push(&pack_objects.args, "--thin");
 295
 296         strvec_push(&pack_objects.args, "--stdout");
 297         if (pack_data->shallow_nr)
 298                 strvec_push(&pack_objects.args, "--shallow");
 299         if (!pack_data->no_progress)
 300                 strvec_push(&pack_objects.args, "--progress");
 301         if (pack_data->use_ofs_delta)
 302                 strvec_push(&pack_objects.args, "--delta-base-offset");
 303         if (pack_data->use_include_tag)
 304                 strvec_push(&pack_objects.args, "--include-tag");
 305         if (pack_data->filter_options.choice) {
 306                 const char *spec =
 307                         expand_list_objects_filter_spec(&pack_data->filter_options);
 308                 if (pack_objects.use_shell) {
 309                         struct strbuf buf = STRBUF_INIT;
 310                         sq_quote_buf(&buf, spec);
 311                         strvec_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 312                         strbuf_release(&buf);
 313                 } else {
 314                         strvec_pushf(&pack_objects.args, "--filter=%s", spec);
 315                 }
 316         }
 317         if (uri_protocols) {
 318                 for (i = 0; i < uri_protocols->nr; i++)
 319                         strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
 320                                          uri_protocols->items[i].string);
 321         }
 322
 323         pack_objects.in = -1;
 324         pack_objects.out = -1;
 325         pack_objects.err = -1;
 326         pack_objects.clean_on_exit = 1;
 327
 328         if (start_command(&pack_objects))
 329                 die("git upload-pack: unable to fork git-pack-objects");
 330
 331         pipe_fd = xfdopen(pack_objects.in, "w");
 332
 333         if (pack_data->shallow_nr)
 334                 for_each_commit_graft(write_one_shallow, pipe_fd);
 335
 336         for (i = 0; i < pack_data->want_obj.nr; i++)
 337                 fprintf(pipe_fd, "%s\n",
 338                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 339         fprintf(pipe_fd, "--not\n");
 340         for (i = 0; i < pack_data->have_obj.nr; i++)
 341                 fprintf(pipe_fd, "%s\n",
 342                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 343         for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
 344                 fprintf(pipe_fd, "%s\n",
 345                         oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
 346         fprintf(pipe_fd, "\n");
 347         fflush(pipe_fd);
 348         fclose(pipe_fd);
 349
 350         /* We read from pack_objects.err to capture stderr output for
 351          * progress bar, and pack_objects.out to capture the pack data.
 352          */
 353
 354         while (1) {
 355                 struct pollfd pfd[2];
 356                 int pe, pu, pollsize, polltimeout;
 357                 int ret;
 358
 359                 reset_timeout(pack_data->timeout);
 360
 361                 pollsize = 0;
 362                 pe = pu = -1;
 363
 364                 if (0 <= pack_objects.out) {
 365                         pfd[pollsize].fd = pack_objects.out;
 366                         pfd[pollsize].events = POLLIN;
 367                         pu = pollsize;
 368                         pollsize++;
 369                 }
 370                 if (0 <= pack_objects.err) {
 371                         pfd[pollsize].fd = pack_objects.err;
 372                         pfd[pollsize].events = POLLIN;
 373                         pe = pollsize;
 374                         pollsize++;
 375                 }
 376
 377                 if (!pollsize)
 378                         break;
 379
 380                 polltimeout = pack_data->keepalive < 0
 381                         ? -1
 382                         : 1000 * pack_data->keepalive;
 383
 384                 ret = poll(pfd, pollsize, polltimeout);
 385
 386                 if (ret < 0) {
 387                         if (errno != EINTR) {
 388                                 error_errno("poll failed, resuming");
 389                                 sleep(1);
 390                         }
 391                         continue;
 392                 }
 393                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 394                         /* Status ready; we ship that in the side-band
 395                          * or dump to the standard error.
 396                          */
 397                         sz = xread(pack_objects.err, progress,
 398                                   sizeof(progress));
 399                         if (0 < sz)
 400                                 send_client_data(2, progress, sz,
 401                                                  pack_data->use_sideband);
 402                         else if (sz == 0) {
 403                                 close(pack_objects.err);
 404                                 pack_objects.err = -1;
 405                         }
 406                         else
 407                                 goto fail;
 408                         /* give priority to status messages */
 409                         continue;
 410                 }
 411                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 412                         int result = relay_pack_data(pack_objects.out,
 413                                                      &output_state,
 414                                                      pack_data->use_sideband,
 415                                                      !!uri_protocols);
 416
 417                         if (result == 0) {
 418                                 close(pack_objects.out);
 419                                 pack_objects.out = -1;
 420                         } else if (result < 0) {
 421                                 goto fail;
 422                         }
 423                 }
 424
 425                 /*
 426                  * We hit the keepalive timeout without saying anything; send
 427                  * an empty message on the data sideband just to let the other
 428                  * side know we're still working on it, but don't have any data
 429                  * yet.
 430                  *
 431                  * If we don't have a sideband channel, there's no room in the
 432                  * protocol to say anything, so those clients are just out of
 433                  * luck.
 434                  */
 435                 if (!ret && pack_data->use_sideband) {
 436                         static const char buf[] = "0005\1";
 437                         write_or_die(1, buf, 5);
 438                 }
 439         }
 440
 441         if (finish_command(&pack_objects)) {
 442                 error("git upload-pack: git-pack-objects died with error.");
 443                 goto fail;
 444         }
 445
 446         /* flush the data */
 447         if (output_state.used > 0) {
 448                 send_client_data(1, output_state.buffer, output_state.used,
 449                                  pack_data->use_sideband);
 450                 fprintf(stderr, "flushed.\n");
 451         }
 452         if (pack_data->use_sideband)
 453                 packet_flush(1);
 454         return;
 455
 456  fail:
 457         send_client_data(3, abort_msg, sizeof(abort_msg),
 458                          pack_data->use_sideband);
 459         die("git upload-pack: %s", abort_msg);
 460 }
 461
 462 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
 463 {
 464         int we_knew_they_have = 0;
 465         struct object *o = parse_object(the_repository, oid);
 466
 467         if (!o)
 468                 die("oops (%s)", oid_to_hex(oid));
 469         if (o->type == OBJ_COMMIT) {
 470                 struct commit_list *parents;
 471                 struct commit *commit = (struct commit *)o;
 472                 if (o->flags & THEY_HAVE)
 473                         we_knew_they_have = 1;
 474                 else
 475                         o->flags |= THEY_HAVE;
 476                 if (!data->oldest_have || (commit->date < data->oldest_have))
 477                         data->oldest_have = commit->date;
 478                 for (parents = commit->parents;
 479                      parents;
 480                      parents = parents->next)
 481                         parents->item->object.flags |= THEY_HAVE;
 482         }
 483         if (!we_knew_they_have) {
 484                 add_object_array(o, NULL, &data->have_obj);
 485                 return 1;
 486         }
 487         return 0;
 488 }
 489
 490 static int got_oid(struct upload_pack_data *data,
 491                    const char *hex, struct object_id *oid)
 492 {
 493         if (get_oid_hex(hex, oid))
 494                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 495         if (!has_object_file_with_flags(oid,
 496                                         OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
 497                 return -1;
 498         return do_got_oid(data, oid);
 499 }
 500
 501 static int ok_to_give_up(struct upload_pack_data *data)
 502 {
 503         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 504
 505         if (!data->have_obj.nr)
 506                 return 0;
 507
 508         return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
 509                                             COMMON_KNOWN, data->oldest_have,
 510                                             min_generation);
 511 }
 512
 513 static int get_common_commits(struct upload_pack_data *data,
 514                               struct packet_reader *reader)
 515 {
 516         struct object_id oid;
 517         char last_hex[GIT_MAX_HEXSZ + 1];
 518         int got_common = 0;
 519         int got_other = 0;
 520         int sent_ready = 0;
 521
 522         save_commit_buffer = 0;
 523
 524         for (;;) {
 525                 const char *arg;
 526
 527                 reset_timeout(data->timeout);
 528
 529                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 530                         if (data->multi_ack == MULTI_ACK_DETAILED
 531                             && got_common
 532                             && !got_other
 533                             && ok_to_give_up(data)) {
 534                                 sent_ready = 1;
 535                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 536                         }
 537                         if (data->have_obj.nr == 0 || data->multi_ack)
 538                                 packet_write_fmt(1, "NAK\n");
 539
 540                         if (data->no_done && sent_ready) {
 541                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 542                                 return 0;
 543                         }
 544                         if (data->stateless_rpc)
 545                                 exit(0);
 546                         got_common = 0;
 547                         got_other = 0;
 548                         continue;
 549                 }
 550                 if (skip_prefix(reader->line, "have ", &arg)) {
 551                         switch (got_oid(data, arg, &oid)) {
 552                         case -1: /* they have what we do not */
 553                                 got_other = 1;
 554                                 if (data->multi_ack
 555                                     && ok_to_give_up(data)) {
 556                                         const char *hex = oid_to_hex(&oid);
 557                                         if (data->multi_ack == MULTI_ACK_DETAILED) {
 558                                                 sent_ready = 1;
 559                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 560                                         } else
 561                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 562                                 }
 563                                 break;
 564                         default:
 565                                 got_common = 1;
 566                                 oid_to_hex_r(last_hex, &oid);
 567                                 if (data->multi_ack == MULTI_ACK_DETAILED)
 568                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 569                                 else if (data->multi_ack)
 570                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 571                                 else if (data->have_obj.nr == 1)
 572                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 573                                 break;
 574                         }
 575                         continue;
 576                 }
 577                 if (!strcmp(reader->line, "done")) {
 578                         if (data->have_obj.nr > 0) {
 579                                 if (data->multi_ack)
 580                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 581                                 return 0;
 582                         }
 583                         packet_write_fmt(1, "NAK\n");
 584                         return -1;
 585                 }
 586                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 587         }
 588 }
 589
 590 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
 591 {
 592         int allow_hidden_ref = (allow_uor &
 593                                 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 594         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 595 }
 596
 597 /*
 598  * on successful case, it's up to the caller to close cmd->out
 599  */
 600 static int do_reachable_revlist(struct child_process *cmd,
 601                                 struct object_array *src,
 602                                 struct object_array *reachable,
 603                                 enum allow_uor allow_uor)
 604 {
 605         static const char *argv[] = {
 606                 "rev-list", "--stdin", NULL,
 607         };
 608         struct object *o;
 609         FILE *cmd_in = NULL;
 610         int i;
 611
 612         cmd->argv = argv;
 613         cmd->git_cmd = 1;
 614         cmd->no_stderr = 1;
 615         cmd->in = -1;
 616         cmd->out = -1;
 617
 618         /*
 619          * If the next rev-list --stdin encounters an unknown commit,
 620          * it terminates, which will cause SIGPIPE in the write loop
 621          * below.
 622          */
 623         sigchain_push(SIGPIPE, SIG_IGN);
 624
 625         if (start_command(cmd))
 626                 goto error;
 627
 628         cmd_in = xfdopen(cmd->in, "w");
 629
 630         for (i = get_max_object_index(); 0 < i; ) {
 631                 o = get_indexed_object(--i);
 632                 if (!o)
 633                         continue;
 634                 if (reachable && o->type == OBJ_COMMIT)
 635                         o->flags &= ~TMP_MARK;
 636                 if (!is_our_ref(o, allow_uor))
 637                         continue;
 638                 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
 639                         goto error;
 640         }
 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                 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
 651                         goto error;
 652         }
 653         if (ferror(cmd_in) || fflush(cmd_in))
 654                 goto error;
 655         fclose(cmd_in);
 656         cmd->in = -1;
 657         sigchain_pop(SIGPIPE);
 658
 659         return 0;
 660
 661 error:
 662         sigchain_pop(SIGPIPE);
 663
 664         if (cmd_in)
 665                 fclose(cmd_in);
 666         if (cmd->out >= 0)
 667                 close(cmd->out);
 668         return -1;
 669 }
 670
 671 static int get_reachable_list(struct upload_pack_data *data,
 672                               struct object_array *reachable)
 673 {
 674         struct child_process cmd = CHILD_PROCESS_INIT;
 675         int i;
 676         struct object *o;
 677         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 678         const unsigned hexsz = the_hash_algo->hexsz;
 679
 680         if (do_reachable_revlist(&cmd, &data->shallows, reachable,
 681                                  data->allow_uor) < 0)
 682                 return -1;
 683
 684         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 685                 struct object_id oid;
 686                 const char *p;
 687
 688                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 689                         break;
 690
 691                 o = lookup_object(the_repository, &oid);
 692                 if (o && o->type == OBJ_COMMIT) {
 693                         o->flags &= ~TMP_MARK;
 694                 }
 695         }
 696         for (i = get_max_object_index(); 0 < i; i--) {
 697                 o = get_indexed_object(i - 1);
 698                 if (o && o->type == OBJ_COMMIT &&
 699                     (o->flags & TMP_MARK)) {
 700                         add_object_array(o, NULL, reachable);
 701                                 o->flags &= ~TMP_MARK;
 702                 }
 703         }
 704         close(cmd.out);
 705
 706         if (finish_command(&cmd))
 707                 return -1;
 708
 709         return 0;
 710 }
 711
 712 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
 713 {
 714         struct child_process cmd = CHILD_PROCESS_INIT;
 715         char buf[1];
 716         int i;
 717
 718         if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
 719                 return 1;
 720
 721         /*
 722          * The commits out of the rev-list are not ancestors of
 723          * our ref.
 724          */
 725         i = read_in_full(cmd.out, buf, 1);
 726         if (i)
 727                 goto error;
 728         close(cmd.out);
 729         cmd.out = -1;
 730
 731         /*
 732          * rev-list may have died by encountering a bad commit
 733          * in the history, in which case we do want to bail out
 734          * even when it showed no commit.
 735          */
 736         if (finish_command(&cmd))
 737                 goto error;
 738
 739         /* All the non-tip ones are ancestors of what we advertised */
 740         return 0;
 741
 742 error:
 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                 int feature_len;
1063
1064                 reset_timeout(data->timeout);
1065                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1066                         break;
1067
1068                 if (process_shallow(reader->line, &data->shallows))
1069                         continue;
1070                 if (process_deepen(reader->line, &data->depth))
1071                         continue;
1072                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1073                         continue;
1074                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1075                         continue;
1076
1077                 if (skip_prefix(reader->line, "filter ", &arg)) {
1078                         if (!data->filter_capability_requested)
1079                                 die("git upload-pack: filtering capability not negotiated");
1080                         list_objects_filter_die_if_populated(&data->filter_options);
1081                         parse_list_objects_filter(&data->filter_options, arg);
1082                         die_if_using_banned_filter(data);
1083                         continue;
1084                 }
1085
1086                 if (!skip_prefix(reader->line, "want ", &arg) ||
1087                     parse_oid_hex(arg, &oid_buf, &features))
1088                         die("git upload-pack: protocol error, "
1089                             "expected to get object ID, not '%s'", reader->line);
1090
1091                 if (parse_feature_request(features, "deepen-relative"))
1092                         data->deepen_relative = 1;
1093                 if (parse_feature_request(features, "multi_ack_detailed"))
1094                         data->multi_ack = MULTI_ACK_DETAILED;
1095                 else if (parse_feature_request(features, "multi_ack"))
1096                         data->multi_ack = MULTI_ACK;
1097                 if (parse_feature_request(features, "no-done"))
1098                         data->no_done = 1;
1099                 if (parse_feature_request(features, "thin-pack"))
1100                         data->use_thin_pack = 1;
1101                 if (parse_feature_request(features, "ofs-delta"))
1102                         data->use_ofs_delta = 1;
1103                 if (parse_feature_request(features, "side-band-64k"))
1104                         data->use_sideband = LARGE_PACKET_MAX;
1105                 else if (parse_feature_request(features, "side-band"))
1106                         data->use_sideband = DEFAULT_PACKET_MAX;
1107                 if (parse_feature_request(features, "no-progress"))
1108                         data->no_progress = 1;
1109                 if (parse_feature_request(features, "include-tag"))
1110                         data->use_include_tag = 1;
1111                 if (data->allow_filter &&
1112                     parse_feature_request(features, "filter"))
1113                         data->filter_capability_requested = 1;
1114
1115                 arg = parse_feature_value(features, "session-id", &feature_len, NULL);
1116                 if (arg) {
1117                         char *client_sid = xstrndup(arg, feature_len);
1118                         trace2_data_string("transfer", NULL, "client-sid", client_sid);
1119                         free(client_sid);
1120                 }
1121
1122                 o = parse_object(the_repository, &oid_buf);
1123                 if (!o) {
1124                         packet_writer_error(&data->writer,
1125                                             "upload-pack: not our ref %s",
1126                                             oid_to_hex(&oid_buf));
1127                         die("git upload-pack: not our ref %s",
1128                             oid_to_hex(&oid_buf));
1129                 }
1130                 if (!(o->flags & WANTED)) {
1131                         o->flags |= WANTED;
1132                         if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1133                               || is_our_ref(o, data->allow_uor)))
1134                                 has_non_tip = 1;
1135                         add_object_array(o, NULL, &data->want_obj);
1136                 }
1137         }
1138
1139         /*
1140          * We have sent all our refs already, and the other end
1141          * should have chosen out of them. When we are operating
1142          * in the stateless RPC mode, however, their choice may
1143          * have been based on the set of older refs advertised
1144          * by another process that handled the initial request.
1145          */
1146         if (has_non_tip)
1147                 check_non_tip(data);
1148
1149         if (!data->use_sideband && data->daemon_mode)
1150                 data->no_progress = 1;
1151
1152         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1153                 return;
1154
1155         if (send_shallow_list(data))
1156                 packet_flush(1);
1157 }
1158
1159 /* return non-zero if the ref is hidden, otherwise 0 */
1160 static int mark_our_ref(const char *refname, const char *refname_full,
1161                         const struct object_id *oid)
1162 {
1163         struct object *o = lookup_unknown_object(oid);
1164
1165         if (ref_is_hidden(refname, refname_full)) {
1166                 o->flags |= HIDDEN_REF;
1167                 return 1;
1168         }
1169         o->flags |= OUR_REF;
1170         return 0;
1171 }
1172
1173 static int check_ref(const char *refname_full, const struct object_id *oid,
1174                      int flag, void *cb_data)
1175 {
1176         const char *refname = strip_namespace(refname_full);
1177
1178         mark_our_ref(refname, refname_full, oid);
1179         return 0;
1180 }
1181
1182 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1183 {
1184         struct string_list_item *item;
1185
1186         if (!symref->nr)
1187                 return;
1188         for_each_string_list_item(item, symref)
1189                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1190 }
1191
1192 static void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
1193         if (d->advertise_sid)
1194                 strbuf_addf(buf, " session-id=%s", trace2_session_id());
1195 }
1196
1197 static int send_ref(const char *refname, const struct object_id *oid,
1198                     int flag, void *cb_data)
1199 {
1200         static const char *capabilities = "multi_ack thin-pack side-band"
1201                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1202                 " deepen-relative no-progress include-tag multi_ack_detailed";
1203         const char *refname_nons = strip_namespace(refname);
1204         struct object_id peeled;
1205         struct upload_pack_data *data = cb_data;
1206
1207         if (mark_our_ref(refname_nons, refname, oid))
1208                 return 0;
1209
1210         if (capabilities) {
1211                 struct strbuf symref_info = STRBUF_INIT;
1212                 struct strbuf session_id = STRBUF_INIT;
1213
1214                 format_symref_info(&symref_info, &data->symref);
1215                 format_session_id(&session_id, data);
1216                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
1217                              oid_to_hex(oid), refname_nons,
1218                              0, capabilities,
1219                              (data->allow_uor & ALLOW_TIP_SHA1) ?
1220                                      " allow-tip-sha1-in-want" : "",
1221                              (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1222                                      " allow-reachable-sha1-in-want" : "",
1223                              data->stateless_rpc ? " no-done" : "",
1224                              symref_info.buf,
1225                              data->allow_filter ? " filter" : "",
1226                              session_id.buf,
1227                              the_hash_algo->name,
1228                              git_user_agent_sanitized());
1229                 strbuf_release(&symref_info);
1230                 strbuf_release(&session_id);
1231         } else {
1232                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1233         }
1234         capabilities = NULL;
1235         if (!peel_ref(refname, &peeled))
1236                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1237         return 0;
1238 }
1239
1240 static int find_symref(const char *refname, const struct object_id *oid,
1241                        int flag, void *cb_data)
1242 {
1243         const char *symref_target;
1244         struct string_list_item *item;
1245
1246         if ((flag & REF_ISSYMREF) == 0)
1247                 return 0;
1248         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1249         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1250                 die("'%s' is a symref but it is not?", refname);
1251         item = string_list_append(cb_data, strip_namespace(refname));
1252         item->util = xstrdup(strip_namespace(symref_target));
1253         return 0;
1254 }
1255
1256 static int parse_object_filter_config(const char *var, const char *value,
1257                                        struct upload_pack_data *data)
1258 {
1259         struct strbuf buf = STRBUF_INIT;
1260         const char *sub, *key;
1261         size_t sub_len;
1262
1263         if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1264                 return 0;
1265
1266         if (!sub) {
1267                 if (!strcmp(key, "allow"))
1268                         data->allow_filter_fallback = git_config_bool(var, value);
1269                 return 0;
1270         }
1271
1272         strbuf_add(&buf, sub, sub_len);
1273
1274         if (!strcmp(key, "allow"))
1275                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1276                         (void *)(intptr_t)git_config_bool(var, value);
1277         else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1278                 if (!value) {
1279                         strbuf_release(&buf);
1280                         return config_error_nonbool(var);
1281                 }
1282                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1283                         (void *)(intptr_t)1;
1284                 data->tree_filter_max_depth = git_config_ulong(var, value);
1285         }
1286
1287         strbuf_release(&buf);
1288         return 0;
1289 }
1290
1291 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1292 {
1293         struct upload_pack_data *data = cb_data;
1294
1295         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1296                 if (git_config_bool(var, value))
1297                         data->allow_uor |= ALLOW_TIP_SHA1;
1298                 else
1299                         data->allow_uor &= ~ALLOW_TIP_SHA1;
1300         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1301                 if (git_config_bool(var, value))
1302                         data->allow_uor |= ALLOW_REACHABLE_SHA1;
1303                 else
1304                         data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1305         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1306                 if (git_config_bool(var, value))
1307                         data->allow_uor |= ALLOW_ANY_SHA1;
1308                 else
1309                         data->allow_uor &= ~ALLOW_ANY_SHA1;
1310         } else if (!strcmp("uploadpack.keepalive", var)) {
1311                 data->keepalive = git_config_int(var, value);
1312                 if (!data->keepalive)
1313                         data->keepalive = -1;
1314         } else if (!strcmp("uploadpack.allowfilter", var)) {
1315                 data->allow_filter = git_config_bool(var, value);
1316         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1317                 data->allow_ref_in_want = git_config_bool(var, value);
1318         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1319                 data->allow_sideband_all = git_config_bool(var, value);
1320         } else if (!strcmp("core.precomposeunicode", var)) {
1321                 precomposed_unicode = git_config_bool(var, value);
1322         } else if (!strcmp("transfer.advertisesid", var)) {
1323                 data->advertise_sid = git_config_bool(var, value);
1324         }
1325
1326         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1327             current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1328                 if (!strcmp("uploadpack.packobjectshook", var))
1329                         return git_config_string(&data->pack_objects_hook, var, value);
1330         }
1331
1332         if (parse_object_filter_config(var, value, data) < 0)
1333                 return -1;
1334
1335         return parse_hide_refs_config(var, value, "uploadpack");
1336 }
1337
1338 void upload_pack(struct upload_pack_options *options)
1339 {
1340         struct packet_reader reader;
1341         struct upload_pack_data data;
1342
1343         upload_pack_data_init(&data);
1344
1345         git_config(upload_pack_config, &data);
1346
1347         data.stateless_rpc = options->stateless_rpc;
1348         data.daemon_mode = options->daemon_mode;
1349         data.timeout = options->timeout;
1350
1351         head_ref_namespaced(find_symref, &data.symref);
1352
1353         if (options->advertise_refs || !data.stateless_rpc) {
1354                 reset_timeout(data.timeout);
1355                 head_ref_namespaced(send_ref, &data);
1356                 for_each_namespaced_ref(send_ref, &data);
1357                 advertise_shallow_grafts(1);
1358                 packet_flush(1);
1359         } else {
1360                 head_ref_namespaced(check_ref, NULL);
1361                 for_each_namespaced_ref(check_ref, NULL);
1362         }
1363
1364         if (!options->advertise_refs) {
1365                 packet_reader_init(&reader, 0, NULL, 0,
1366                                    PACKET_READ_CHOMP_NEWLINE |
1367                                    PACKET_READ_DIE_ON_ERR_PACKET);
1368
1369                 receive_needs(&data, &reader);
1370
1371                 /*
1372                  * An EOF at this exact point in negotiation should be
1373                  * acceptable from stateless clients as they will consume the
1374                  * shallow list before doing subsequent rpc with haves/etc.
1375                  */
1376                 if (data.stateless_rpc)
1377                         reader.options |= PACKET_READ_GENTLE_ON_EOF;
1378
1379                 if (data.want_obj.nr &&
1380                     packet_reader_peek(&reader) != PACKET_READ_EOF) {
1381                         reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1382                         get_common_commits(&data, &reader);
1383                         create_pack_file(&data, NULL);
1384                 }
1385         }
1386
1387         upload_pack_data_clear(&data);
1388 }
1389
1390 static int parse_want(struct packet_writer *writer, const char *line,
1391                       struct object_array *want_obj)
1392 {
1393         const char *arg;
1394         if (skip_prefix(line, "want ", &arg)) {
1395                 struct object_id oid;
1396                 struct object *o;
1397
1398                 if (get_oid_hex(arg, &oid))
1399                         die("git upload-pack: protocol error, "
1400                             "expected to get oid, not '%s'", line);
1401
1402                 o = parse_object(the_repository, &oid);
1403                 if (!o) {
1404                         packet_writer_error(writer,
1405                                             "upload-pack: not our ref %s",
1406                                             oid_to_hex(&oid));
1407                         die("git upload-pack: not our ref %s",
1408                             oid_to_hex(&oid));
1409                 }
1410
1411                 if (!(o->flags & WANTED)) {
1412                         o->flags |= WANTED;
1413                         add_object_array(o, NULL, want_obj);
1414                 }
1415
1416                 return 1;
1417         }
1418
1419         return 0;
1420 }
1421
1422 static int parse_want_ref(struct packet_writer *writer, const char *line,
1423                           struct string_list *wanted_refs,
1424                           struct object_array *want_obj)
1425 {
1426         const char *arg;
1427         if (skip_prefix(line, "want-ref ", &arg)) {
1428                 struct object_id oid;
1429                 struct string_list_item *item;
1430                 struct object *o;
1431
1432                 if (read_ref(arg, &oid)) {
1433                         packet_writer_error(writer, "unknown ref %s", arg);
1434                         die("unknown ref %s", arg);
1435                 }
1436
1437                 item = string_list_append(wanted_refs, arg);
1438                 item->util = oiddup(&oid);
1439
1440                 o = parse_object_or_die(&oid, arg);
1441                 if (!(o->flags & WANTED)) {
1442                         o->flags |= WANTED;
1443                         add_object_array(o, NULL, want_obj);
1444                 }
1445
1446                 return 1;
1447         }
1448
1449         return 0;
1450 }
1451
1452 static int parse_have(const char *line, struct oid_array *haves)
1453 {
1454         const char *arg;
1455         if (skip_prefix(line, "have ", &arg)) {
1456                 struct object_id oid;
1457
1458                 if (get_oid_hex(arg, &oid))
1459                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1460                 oid_array_append(haves, &oid);
1461                 return 1;
1462         }
1463
1464         return 0;
1465 }
1466
1467 static void process_args(struct packet_reader *request,
1468                          struct upload_pack_data *data)
1469 {
1470         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1471                 const char *arg = request->line;
1472                 const char *p;
1473
1474                 /* process want */
1475                 if (parse_want(&data->writer, arg, &data->want_obj))
1476                         continue;
1477                 if (data->allow_ref_in_want &&
1478                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1479                                    &data->want_obj))
1480                         continue;
1481                 /* process have line */
1482                 if (parse_have(arg, &data->haves))
1483                         continue;
1484
1485                 /* process args like thin-pack */
1486                 if (!strcmp(arg, "thin-pack")) {
1487                         data->use_thin_pack = 1;
1488                         continue;
1489                 }
1490                 if (!strcmp(arg, "ofs-delta")) {
1491                         data->use_ofs_delta = 1;
1492                         continue;
1493                 }
1494                 if (!strcmp(arg, "no-progress")) {
1495                         data->no_progress = 1;
1496                         continue;
1497                 }
1498                 if (!strcmp(arg, "include-tag")) {
1499                         data->use_include_tag = 1;
1500                         continue;
1501                 }
1502                 if (!strcmp(arg, "done")) {
1503                         data->done = 1;
1504                         continue;
1505                 }
1506
1507                 /* Shallow related arguments */
1508                 if (process_shallow(arg, &data->shallows))
1509                         continue;
1510                 if (process_deepen(arg, &data->depth))
1511                         continue;
1512                 if (process_deepen_since(arg, &data->deepen_since,
1513                                          &data->deepen_rev_list))
1514                         continue;
1515                 if (process_deepen_not(arg, &data->deepen_not,
1516                                        &data->deepen_rev_list))
1517                         continue;
1518                 if (!strcmp(arg, "deepen-relative")) {
1519                         data->deepen_relative = 1;
1520                         continue;
1521                 }
1522
1523                 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1524                         list_objects_filter_die_if_populated(&data->filter_options);
1525                         parse_list_objects_filter(&data->filter_options, p);
1526                         die_if_using_banned_filter(data);
1527                         continue;
1528                 }
1529
1530                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1531                      data->allow_sideband_all) &&
1532                     !strcmp(arg, "sideband-all")) {
1533                         data->writer.use_sideband = 1;
1534                         continue;
1535                 }
1536
1537                 if (skip_prefix(arg, "packfile-uris ", &p)) {
1538                         string_list_split(&data->uri_protocols, p, ',', -1);
1539                         continue;
1540                 }
1541
1542                 /* ignore unknown lines maybe? */
1543                 die("unexpected line: '%s'", arg);
1544         }
1545
1546         if (data->uri_protocols.nr && !data->writer.use_sideband)
1547                 string_list_clear(&data->uri_protocols, 0);
1548
1549         if (request->status != PACKET_READ_FLUSH)
1550                 die(_("expected flush after fetch arguments"));
1551 }
1552
1553 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1554 {
1555         int i;
1556
1557         /* Process haves */
1558         for (i = 0; i < data->haves.nr; i++) {
1559                 const struct object_id *oid = &data->haves.oid[i];
1560
1561                 if (!has_object_file_with_flags(oid,
1562                                                 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1563                         continue;
1564
1565                 oid_array_append(common, oid);
1566
1567                 do_got_oid(data, oid);
1568         }
1569
1570         return 0;
1571 }
1572
1573 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1574 {
1575         int i;
1576
1577         packet_writer_write(&data->writer, "acknowledgments\n");
1578
1579         /* Send Acks */
1580         if (!acks->nr)
1581                 packet_writer_write(&data->writer, "NAK\n");
1582
1583         for (i = 0; i < acks->nr; i++) {
1584                 packet_writer_write(&data->writer, "ACK %s\n",
1585                                     oid_to_hex(&acks->oid[i]));
1586         }
1587
1588         if (ok_to_give_up(data)) {
1589                 /* Send Ready */
1590                 packet_writer_write(&data->writer, "ready\n");
1591                 return 1;
1592         }
1593
1594         return 0;
1595 }
1596
1597 static int process_haves_and_send_acks(struct upload_pack_data *data)
1598 {
1599         struct oid_array common = OID_ARRAY_INIT;
1600         int ret = 0;
1601
1602         process_haves(data, &common);
1603         if (data->done) {
1604                 ret = 1;
1605         } else if (send_acks(data, &common)) {
1606                 packet_writer_delim(&data->writer);
1607                 ret = 1;
1608         } else {
1609                 /* Add Flush */
1610                 packet_writer_flush(&data->writer);
1611                 ret = 0;
1612         }
1613
1614         oid_array_clear(&data->haves);
1615         oid_array_clear(&common);
1616         return ret;
1617 }
1618
1619 static void send_wanted_ref_info(struct upload_pack_data *data)
1620 {
1621         const struct string_list_item *item;
1622
1623         if (!data->wanted_refs.nr)
1624                 return;
1625
1626         packet_writer_write(&data->writer, "wanted-refs\n");
1627
1628         for_each_string_list_item(item, &data->wanted_refs) {
1629                 packet_writer_write(&data->writer, "%s %s\n",
1630                                     oid_to_hex(item->util),
1631                                     item->string);
1632         }
1633
1634         packet_writer_delim(&data->writer);
1635 }
1636
1637 static void send_shallow_info(struct upload_pack_data *data)
1638 {
1639         /* No shallow info needs to be sent */
1640         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1641             !is_repository_shallow(the_repository))
1642                 return;
1643
1644         packet_writer_write(&data->writer, "shallow-info\n");
1645
1646         if (!send_shallow_list(data) &&
1647             is_repository_shallow(the_repository))
1648                 deepen(data, INFINITE_DEPTH);
1649
1650         packet_delim(1);
1651 }
1652
1653 enum fetch_state {
1654         FETCH_PROCESS_ARGS = 0,
1655         FETCH_SEND_ACKS,
1656         FETCH_SEND_PACK,
1657         FETCH_DONE,
1658 };
1659
1660 int upload_pack_v2(struct repository *r, struct strvec *keys,
1661                    struct packet_reader *request)
1662 {
1663         enum fetch_state state = FETCH_PROCESS_ARGS;
1664         struct upload_pack_data data;
1665
1666         clear_object_flags(ALL_FLAGS);
1667
1668         upload_pack_data_init(&data);
1669         data.use_sideband = LARGE_PACKET_MAX;
1670
1671         git_config(upload_pack_config, &data);
1672
1673         while (state != FETCH_DONE) {
1674                 switch (state) {
1675                 case FETCH_PROCESS_ARGS:
1676                         process_args(request, &data);
1677
1678                         if (!data.want_obj.nr) {
1679                                 /*
1680                                  * Request didn't contain any 'want' lines,
1681                                  * guess they didn't want anything.
1682                                  */
1683                                 state = FETCH_DONE;
1684                         } else if (data.haves.nr) {
1685                                 /*
1686                                  * Request had 'have' lines, so lets ACK them.
1687                                  */
1688                                 state = FETCH_SEND_ACKS;
1689                         } else {
1690                                 /*
1691                                  * Request had 'want's but no 'have's so we can
1692                                  * immedietly go to construct and send a pack.
1693                                  */
1694                                 state = FETCH_SEND_PACK;
1695                         }
1696                         break;
1697                 case FETCH_SEND_ACKS:
1698                         if (process_haves_and_send_acks(&data))
1699                                 state = FETCH_SEND_PACK;
1700                         else
1701                                 state = FETCH_DONE;
1702                         break;
1703                 case FETCH_SEND_PACK:
1704                         send_wanted_ref_info(&data);
1705                         send_shallow_info(&data);
1706
1707                         if (data.uri_protocols.nr) {
1708                                 create_pack_file(&data, &data.uri_protocols);
1709                         } else {
1710                                 packet_writer_write(&data.writer, "packfile\n");
1711                                 create_pack_file(&data, NULL);
1712                         }
1713                         state = FETCH_DONE;
1714                         break;
1715                 case FETCH_DONE:
1716                         continue;
1717                 }
1718         }
1719
1720         upload_pack_data_clear(&data);
1721         return 0;
1722 }
1723
1724 int upload_pack_advertise(struct repository *r,
1725                           struct strbuf *value)
1726 {
1727         if (value) {
1728                 int allow_filter_value;
1729                 int allow_ref_in_want;
1730                 int allow_sideband_all_value;
1731                 char *str = NULL;
1732
1733                 strbuf_addstr(value, "shallow");
1734
1735                 if (!repo_config_get_bool(the_repository,
1736                                          "uploadpack.allowfilter",
1737                                          &allow_filter_value) &&
1738                     allow_filter_value)
1739                         strbuf_addstr(value, " filter");
1740
1741                 if (!repo_config_get_bool(the_repository,
1742                                          "uploadpack.allowrefinwant",
1743                                          &allow_ref_in_want) &&
1744                     allow_ref_in_want)
1745                         strbuf_addstr(value, " ref-in-want");
1746
1747                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1748                     (!repo_config_get_bool(the_repository,
1749                                            "uploadpack.allowsidebandall",
1750                                            &allow_sideband_all_value) &&
1751                      allow_sideband_all_value))
1752                         strbuf_addstr(value, " sideband-all");
1753
1754                 if (!repo_config_get_string(the_repository,
1755                                             "uploadpack.blobpackfileuri",
1756                                             &str) &&
1757                     str) {
1758                         strbuf_addstr(value, " packfile-uris");
1759                         free(str);
1760                 }
1761         }
1762
1763         return 1;
1764 }