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         pack_objects.clean_on_exit = 1;
 325
 326         if (start_command(&pack_objects))
 327                 die("git upload-pack: unable to fork git-pack-objects");
 328
 329         pipe_fd = xfdopen(pack_objects.in, "w");
 330
 331         if (pack_data->shallow_nr)
 332                 for_each_commit_graft(write_one_shallow, pipe_fd);
 333
 334         for (i = 0; i < pack_data->want_obj.nr; i++)
 335                 fprintf(pipe_fd, "%s\n",
 336                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 337         fprintf(pipe_fd, "--not\n");
 338         for (i = 0; i < pack_data->have_obj.nr; i++)
 339                 fprintf(pipe_fd, "%s\n",
 340                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 341         for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
 342                 fprintf(pipe_fd, "%s\n",
 343                         oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
 344         fprintf(pipe_fd, "\n");
 345         fflush(pipe_fd);
 346         fclose(pipe_fd);
 347
 348         /* We read from pack_objects.err to capture stderr output for
 349          * progress bar, and pack_objects.out to capture the pack data.
 350          */
 351
 352         while (1) {
 353                 struct pollfd pfd[2];
 354                 int pe, pu, pollsize, polltimeout;
 355                 int ret;
 356
 357                 reset_timeout(pack_data->timeout);
 358
 359                 pollsize = 0;
 360                 pe = pu = -1;
 361
 362                 if (0 <= pack_objects.out) {
 363                         pfd[pollsize].fd = pack_objects.out;
 364                         pfd[pollsize].events = POLLIN;
 365                         pu = pollsize;
 366                         pollsize++;
 367                 }
 368                 if (0 <= pack_objects.err) {
 369                         pfd[pollsize].fd = pack_objects.err;
 370                         pfd[pollsize].events = POLLIN;
 371                         pe = pollsize;
 372                         pollsize++;
 373                 }
 374
 375                 if (!pollsize)
 376                         break;
 377
 378                 polltimeout = pack_data->keepalive < 0
 379                         ? -1
 380                         : 1000 * pack_data->keepalive;
 381
 382                 ret = poll(pfd, pollsize, polltimeout);
 383
 384                 if (ret < 0) {
 385                         if (errno != EINTR) {
 386                                 error_errno("poll failed, resuming");
 387                                 sleep(1);
 388                         }
 389                         continue;
 390                 }
 391                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 392                         /* Status ready; we ship that in the side-band
 393                          * or dump to the standard error.
 394                          */
 395                         sz = xread(pack_objects.err, progress,
 396                                   sizeof(progress));
 397                         if (0 < sz)
 398                                 send_client_data(2, progress, sz,
 399                                                  pack_data->use_sideband);
 400                         else if (sz == 0) {
 401                                 close(pack_objects.err);
 402                                 pack_objects.err = -1;
 403                         }
 404                         else
 405                                 goto fail;
 406                         /* give priority to status messages */
 407                         continue;
 408                 }
 409                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 410                         int result = relay_pack_data(pack_objects.out,
 411                                                      &output_state,
 412                                                      pack_data->use_sideband,
 413                                                      !!uri_protocols);
 414
 415                         if (result == 0) {
 416                                 close(pack_objects.out);
 417                                 pack_objects.out = -1;
 418                         } else if (result < 0) {
 419                                 goto fail;
 420                         }
 421                 }
 422
 423                 /*
 424                  * We hit the keepalive timeout without saying anything; send
 425                  * an empty message on the data sideband just to let the other
 426                  * side know we're still working on it, but don't have any data
 427                  * yet.
 428                  *
 429                  * If we don't have a sideband channel, there's no room in the
 430                  * protocol to say anything, so those clients are just out of
 431                  * luck.
 432                  */
 433                 if (!ret && pack_data->use_sideband) {
 434                         static const char buf[] = "0005\1";
 435                         write_or_die(1, buf, 5);
 436                 }
 437         }
 438
 439         if (finish_command(&pack_objects)) {
 440                 error("git upload-pack: git-pack-objects died with error.");
 441                 goto fail;
 442         }
 443
 444         /* flush the data */
 445         if (output_state.used > 0) {
 446                 send_client_data(1, output_state.buffer, output_state.used,
 447                                  pack_data->use_sideband);
 448                 fprintf(stderr, "flushed.\n");
 449         }
 450         if (pack_data->use_sideband)
 451                 packet_flush(1);
 452         return;
 453
 454  fail:
 455         send_client_data(3, abort_msg, sizeof(abort_msg),
 456                          pack_data->use_sideband);
 457         die("git upload-pack: %s", abort_msg);
 458 }
 459
 460 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
 461 {
 462         int we_knew_they_have = 0;
 463         struct object *o = parse_object(the_repository, oid);
 464
 465         if (!o)
 466                 die("oops (%s)", oid_to_hex(oid));
 467         if (o->type == OBJ_COMMIT) {
 468                 struct commit_list *parents;
 469                 struct commit *commit = (struct commit *)o;
 470                 if (o->flags & THEY_HAVE)
 471                         we_knew_they_have = 1;
 472                 else
 473                         o->flags |= THEY_HAVE;
 474                 if (!data->oldest_have || (commit->date < data->oldest_have))
 475                         data->oldest_have = commit->date;
 476                 for (parents = commit->parents;
 477                      parents;
 478                      parents = parents->next)
 479                         parents->item->object.flags |= THEY_HAVE;
 480         }
 481         if (!we_knew_they_have) {
 482                 add_object_array(o, NULL, &data->have_obj);
 483                 return 1;
 484         }
 485         return 0;
 486 }
 487
 488 static int got_oid(struct upload_pack_data *data,
 489                    const char *hex, struct object_id *oid)
 490 {
 491         if (get_oid_hex(hex, oid))
 492                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 493         if (!has_object_file_with_flags(oid,
 494                                         OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
 495                 return -1;
 496         return do_got_oid(data, oid);
 497 }
 498
 499 static int ok_to_give_up(struct upload_pack_data *data)
 500 {
 501         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 502
 503         if (!data->have_obj.nr)
 504                 return 0;
 505
 506         return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
 507                                             COMMON_KNOWN, data->oldest_have,
 508                                             min_generation);
 509 }
 510
 511 static int get_common_commits(struct upload_pack_data *data,
 512                               struct packet_reader *reader)
 513 {
 514         struct object_id oid;
 515         char last_hex[GIT_MAX_HEXSZ + 1];
 516         int got_common = 0;
 517         int got_other = 0;
 518         int sent_ready = 0;
 519
 520         save_commit_buffer = 0;
 521
 522         for (;;) {
 523                 const char *arg;
 524
 525                 reset_timeout(data->timeout);
 526
 527                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 528                         if (data->multi_ack == MULTI_ACK_DETAILED
 529                             && got_common
 530                             && !got_other
 531                             && ok_to_give_up(data)) {
 532                                 sent_ready = 1;
 533                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 534                         }
 535                         if (data->have_obj.nr == 0 || data->multi_ack)
 536                                 packet_write_fmt(1, "NAK\n");
 537
 538                         if (data->no_done && sent_ready) {
 539                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 540                                 return 0;
 541                         }
 542                         if (data->stateless_rpc)
 543                                 exit(0);
 544                         got_common = 0;
 545                         got_other = 0;
 546                         continue;
 547                 }
 548                 if (skip_prefix(reader->line, "have ", &arg)) {
 549                         switch (got_oid(data, arg, &oid)) {
 550                         case -1: /* they have what we do not */
 551                                 got_other = 1;
 552                                 if (data->multi_ack
 553                                     && ok_to_give_up(data)) {
 554                                         const char *hex = oid_to_hex(&oid);
 555                                         if (data->multi_ack == MULTI_ACK_DETAILED) {
 556                                                 sent_ready = 1;
 557                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 558                                         } else
 559                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 560                                 }
 561                                 break;
 562                         default:
 563                                 got_common = 1;
 564                                 oid_to_hex_r(last_hex, &oid);
 565                                 if (data->multi_ack == MULTI_ACK_DETAILED)
 566                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 567                                 else if (data->multi_ack)
 568                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 569                                 else if (data->have_obj.nr == 1)
 570                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 571                                 break;
 572                         }
 573                         continue;
 574                 }
 575                 if (!strcmp(reader->line, "done")) {
 576                         if (data->have_obj.nr > 0) {
 577                                 if (data->multi_ack)
 578                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 579                                 return 0;
 580                         }
 581                         packet_write_fmt(1, "NAK\n");
 582                         return -1;
 583                 }
 584                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 585         }
 586 }
 587
 588 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
 589 {
 590         int allow_hidden_ref = (allow_uor &
 591                                 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 592         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 593 }
 594
 595 /*
 596  * on successful case, it's up to the caller to close cmd->out
 597  */
 598 static int do_reachable_revlist(struct child_process *cmd,
 599                                 struct object_array *src,
 600                                 struct object_array *reachable,
 601                                 enum allow_uor allow_uor)
 602 {
 603         static const char *argv[] = {
 604                 "rev-list", "--stdin", NULL,
 605         };
 606         struct object *o;
 607         FILE *cmd_in = NULL;
 608         int i;
 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         cmd_in = xfdopen(cmd->in, "w");
 627
 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                 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
 637                         goto error;
 638         }
 639         for (i = 0; i < src->nr; i++) {
 640                 o = src->objects[i].item;
 641                 if (is_our_ref(o, allow_uor)) {
 642                         if (reachable)
 643                                 add_object_array(o, NULL, reachable);
 644                         continue;
 645                 }
 646                 if (reachable && o->type == OBJ_COMMIT)
 647                         o->flags |= TMP_MARK;
 648                 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
 649                         goto error;
 650         }
 651         if (ferror(cmd_in) || fflush(cmd_in))
 652                 goto error;
 653         fclose(cmd_in);
 654         cmd->in = -1;
 655         sigchain_pop(SIGPIPE);
 656
 657         return 0;
 658
 659 error:
 660         sigchain_pop(SIGPIPE);
 661
 662         if (cmd_in)
 663                 fclose(cmd_in);
 664         if (cmd->out >= 0)
 665                 close(cmd->out);
 666         return -1;
 667 }
 668
 669 static int get_reachable_list(struct upload_pack_data *data,
 670                               struct object_array *reachable)
 671 {
 672         struct child_process cmd = CHILD_PROCESS_INIT;
 673         int i;
 674         struct object *o;
 675         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 676         const unsigned hexsz = the_hash_algo->hexsz;
 677
 678         if (do_reachable_revlist(&cmd, &data->shallows, reachable,
 679                                  data->allow_uor) < 0)
 680                 return -1;
 681
 682         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 683                 struct object_id oid;
 684                 const char *p;
 685
 686                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 687                         break;
 688
 689                 o = lookup_object(the_repository, &oid);
 690                 if (o && o->type == OBJ_COMMIT) {
 691                         o->flags &= ~TMP_MARK;
 692                 }
 693         }
 694         for (i = get_max_object_index(); 0 < i; i--) {
 695                 o = get_indexed_object(i - 1);
 696                 if (o && o->type == OBJ_COMMIT &&
 697                     (o->flags & TMP_MARK)) {
 698                         add_object_array(o, NULL, reachable);
 699                                 o->flags &= ~TMP_MARK;
 700                 }
 701         }
 702         close(cmd.out);
 703
 704         if (finish_command(&cmd))
 705                 return -1;
 706
 707         return 0;
 708 }
 709
 710 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
 711 {
 712         struct child_process cmd = CHILD_PROCESS_INIT;
 713         char buf[1];
 714         int i;
 715
 716         if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
 717                 return 1;
 718
 719         /*
 720          * The commits out of the rev-list are not ancestors of
 721          * our ref.
 722          */
 723         i = read_in_full(cmd.out, buf, 1);
 724         if (i)
 725                 goto error;
 726         close(cmd.out);
 727         cmd.out = -1;
 728
 729         /*
 730          * rev-list may have died by encountering a bad commit
 731          * in the history, in which case we do want to bail out
 732          * even when it showed no commit.
 733          */
 734         if (finish_command(&cmd))
 735                 goto error;
 736
 737         /* All the non-tip ones are ancestors of what we advertised */
 738         return 0;
 739
 740 error:
 741         if (cmd.out >= 0)
 742                 close(cmd.out);
 743         return 1;
 744 }
 745
 746 static void check_non_tip(struct upload_pack_data *data)
 747 {
 748         int i;
 749
 750         /*
 751          * In the normal in-process case without
 752          * uploadpack.allowReachableSHA1InWant,
 753          * non-tip requests can never happen.
 754          */
 755         if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
 756                 goto error;
 757         if (!has_unreachable(&data->want_obj, data->allow_uor))
 758                 /* All the non-tip ones are ancestors of what we advertised */
 759                 return;
 760
 761 error:
 762         /* Pick one of them (we know there at least is one) */
 763         for (i = 0; i < data->want_obj.nr; i++) {
 764                 struct object *o = data->want_obj.objects[i].item;
 765                 if (!is_our_ref(o, data->allow_uor)) {
 766                         packet_writer_error(&data->writer,
 767                                             "upload-pack: not our ref %s",
 768                                             oid_to_hex(&o->oid));
 769                         die("git upload-pack: not our ref %s",
 770                             oid_to_hex(&o->oid));
 771                 }
 772         }
 773 }
 774
 775 static void send_shallow(struct upload_pack_data *data,
 776                          struct commit_list *result)
 777 {
 778         while (result) {
 779                 struct object *object = &result->item->object;
 780                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 781                         packet_writer_write(&data->writer, "shallow %s",
 782                                             oid_to_hex(&object->oid));
 783                         register_shallow(the_repository, &object->oid);
 784                         data->shallow_nr++;
 785                 }
 786                 result = result->next;
 787         }
 788 }
 789
 790 static void send_unshallow(struct upload_pack_data *data)
 791 {
 792         int i;
 793
 794         for (i = 0; i < data->shallows.nr; i++) {
 795                 struct object *object = data->shallows.objects[i].item;
 796                 if (object->flags & NOT_SHALLOW) {
 797                         struct commit_list *parents;
 798                         packet_writer_write(&data->writer, "unshallow %s",
 799                                             oid_to_hex(&object->oid));
 800                         object->flags &= ~CLIENT_SHALLOW;
 801                         /*
 802                          * We want to _register_ "object" as shallow, but we
 803                          * also need to traverse object's parents to deepen a
 804                          * shallow clone. Unregister it for now so we can
 805                          * parse and add the parents to the want list, then
 806                          * re-register it.
 807                          */
 808                         unregister_shallow(&object->oid);
 809                         object->parsed = 0;
 810                         parse_commit_or_die((struct commit *)object);
 811                         parents = ((struct commit *)object)->parents;
 812                         while (parents) {
 813                                 add_object_array(&parents->item->object,
 814                                                  NULL, &data->want_obj);
 815                                 parents = parents->next;
 816                         }
 817                         add_object_array(object, NULL, &data->extra_edge_obj);
 818                 }
 819                 /* make sure commit traversal conforms to client */
 820                 register_shallow(the_repository, &object->oid);
 821         }
 822 }
 823
 824 static int check_ref(const char *refname_full, const struct object_id *oid,
 825                      int flag, void *cb_data);
 826 static void deepen(struct upload_pack_data *data, int depth)
 827 {
 828         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 829                 int i;
 830
 831                 for (i = 0; i < data->shallows.nr; i++) {
 832                         struct object *object = data->shallows.objects[i].item;
 833                         object->flags |= NOT_SHALLOW;
 834                 }
 835         } else if (data->deepen_relative) {
 836                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 837                 struct commit_list *result;
 838
 839                 /*
 840                  * Checking for reachable shallows requires that our refs be
 841                  * marked with OUR_REF.
 842                  */
 843                 head_ref_namespaced(check_ref, NULL);
 844                 for_each_namespaced_ref(check_ref, NULL);
 845
 846                 get_reachable_list(data, &reachable_shallows);
 847                 result = get_shallow_commits(&reachable_shallows,
 848                                              depth + 1,
 849                                              SHALLOW, NOT_SHALLOW);
 850                 send_shallow(data, result);
 851                 free_commit_list(result);
 852                 object_array_clear(&reachable_shallows);
 853         } else {
 854                 struct commit_list *result;
 855
 856                 result = get_shallow_commits(&data->want_obj, depth,
 857                                              SHALLOW, NOT_SHALLOW);
 858                 send_shallow(data, result);
 859                 free_commit_list(result);
 860         }
 861
 862         send_unshallow(data);
 863 }
 864
 865 static void deepen_by_rev_list(struct upload_pack_data *data,
 866                                int ac,
 867                                const char **av)
 868 {
 869         struct commit_list *result;
 870
 871         disable_commit_graph(the_repository);
 872         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 873         send_shallow(data, result);
 874         free_commit_list(result);
 875         send_unshallow(data);
 876 }
 877
 878 /* Returns 1 if a shallow list is sent or 0 otherwise */
 879 static int send_shallow_list(struct upload_pack_data *data)
 880 {
 881         int ret = 0;
 882
 883         if (data->depth > 0 && data->deepen_rev_list)
 884                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 885         if (data->depth > 0) {
 886                 deepen(data, data->depth);
 887                 ret = 1;
 888         } else if (data->deepen_rev_list) {
 889                 struct strvec av = STRVEC_INIT;
 890                 int i;
 891
 892                 strvec_push(&av, "rev-list");
 893                 if (data->deepen_since)
 894                         strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
 895                 if (data->deepen_not.nr) {
 896                         strvec_push(&av, "--not");
 897                         for (i = 0; i < data->deepen_not.nr; i++) {
 898                                 struct string_list_item *s = data->deepen_not.items + i;
 899                                 strvec_push(&av, s->string);
 900                         }
 901                         strvec_push(&av, "--not");
 902                 }
 903                 for (i = 0; i < data->want_obj.nr; i++) {
 904                         struct object *o = data->want_obj.objects[i].item;
 905                         strvec_push(&av, oid_to_hex(&o->oid));
 906                 }
 907                 deepen_by_rev_list(data, av.nr, av.v);
 908                 strvec_clear(&av);
 909                 ret = 1;
 910         } else {
 911                 if (data->shallows.nr > 0) {
 912                         int i;
 913                         for (i = 0; i < data->shallows.nr; i++)
 914                                 register_shallow(the_repository,
 915                                                  &data->shallows.objects[i].item->oid);
 916                 }
 917         }
 918
 919         data->shallow_nr += data->shallows.nr;
 920         return ret;
 921 }
 922
 923 static int process_shallow(const char *line, struct object_array *shallows)
 924 {
 925         const char *arg;
 926         if (skip_prefix(line, "shallow ", &arg)) {
 927                 struct object_id oid;
 928                 struct object *object;
 929                 if (get_oid_hex(arg, &oid))
 930                         die("invalid shallow line: %s", line);
 931                 object = parse_object(the_repository, &oid);
 932                 if (!object)
 933                         return 1;
 934                 if (object->type != OBJ_COMMIT)
 935                         die("invalid shallow object %s", oid_to_hex(&oid));
 936                 if (!(object->flags & CLIENT_SHALLOW)) {
 937                         object->flags |= CLIENT_SHALLOW;
 938                         add_object_array(object, NULL, shallows);
 939                 }
 940                 return 1;
 941         }
 942
 943         return 0;
 944 }
 945
 946 static int process_deepen(const char *line, int *depth)
 947 {
 948         const char *arg;
 949         if (skip_prefix(line, "deepen ", &arg)) {
 950                 char *end = NULL;
 951                 *depth = (int)strtol(arg, &end, 0);
 952                 if (!end || *end || *depth <= 0)
 953                         die("Invalid deepen: %s", line);
 954                 return 1;
 955         }
 956
 957         return 0;
 958 }
 959
 960 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 961 {
 962         const char *arg;
 963         if (skip_prefix(line, "deepen-since ", &arg)) {
 964                 char *end = NULL;
 965                 *deepen_since = parse_timestamp(arg, &end, 0);
 966                 if (!end || *end || !deepen_since ||
 967                     /* revisions.c's max_age -1 is special */
 968                     *deepen_since == -1)
 969                         die("Invalid deepen-since: %s", line);
 970                 *deepen_rev_list = 1;
 971                 return 1;
 972         }
 973         return 0;
 974 }
 975
 976 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 977 {
 978         const char *arg;
 979         if (skip_prefix(line, "deepen-not ", &arg)) {
 980                 char *ref = NULL;
 981                 struct object_id oid;
 982                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 983                         die("git upload-pack: ambiguous deepen-not: %s", line);
 984                 string_list_append(deepen_not, ref);
 985                 free(ref);
 986                 *deepen_rev_list = 1;
 987                 return 1;
 988         }
 989         return 0;
 990 }
 991
 992 NORETURN __attribute__((format(printf,2,3)))
 993 static void send_err_and_die(struct upload_pack_data *data,
 994                              const char *fmt, ...)
 995 {
 996         struct strbuf buf = STRBUF_INIT;
 997         va_list ap;
 998
 999         va_start(ap, fmt);
1000         strbuf_vaddf(&buf, fmt, ap);
1001         va_end(ap);
1002
1003         packet_writer_error(&data->writer, "%s", buf.buf);
1004         die("%s", buf.buf);
1005 }
1006
1007 static void check_one_filter(struct upload_pack_data *data,
1008                              struct list_objects_filter_options *opts)
1009 {
1010         const char *key = list_object_filter_config_name(opts->choice);
1011         struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1012                                                            key);
1013         int allowed;
1014
1015         if (item)
1016                 allowed = (intptr_t)item->util;
1017         else
1018                 allowed = data->allow_filter_fallback;
1019
1020         if (!allowed)
1021                 send_err_and_die(data, "filter '%s' not supported", key);
1022
1023         if (opts->choice == LOFC_TREE_DEPTH &&
1024             opts->tree_exclude_depth > data->tree_filter_max_depth)
1025                 send_err_and_die(data,
1026                                  "tree filter allows max depth %lu, but got %lu",
1027                                  data->tree_filter_max_depth,
1028                                  opts->tree_exclude_depth);
1029 }
1030
1031 static void check_filter_recurse(struct upload_pack_data *data,
1032                                  struct list_objects_filter_options *opts)
1033 {
1034         size_t i;
1035
1036         check_one_filter(data, opts);
1037         if (opts->choice != LOFC_COMBINE)
1038                 return;
1039
1040         for (i = 0; i < opts->sub_nr; i++)
1041                 check_filter_recurse(data, &opts->sub[i]);
1042 }
1043
1044 static void die_if_using_banned_filter(struct upload_pack_data *data)
1045 {
1046         check_filter_recurse(data, &data->filter_options);
1047 }
1048
1049 static void receive_needs(struct upload_pack_data *data,
1050                           struct packet_reader *reader)
1051 {
1052         int has_non_tip = 0;
1053
1054         data->shallow_nr = 0;
1055         for (;;) {
1056                 struct object *o;
1057                 const char *features;
1058                 struct object_id oid_buf;
1059                 const char *arg;
1060
1061                 reset_timeout(data->timeout);
1062                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1063                         break;
1064
1065                 if (process_shallow(reader->line, &data->shallows))
1066                         continue;
1067                 if (process_deepen(reader->line, &data->depth))
1068                         continue;
1069                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1070                         continue;
1071                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1072                         continue;
1073
1074                 if (skip_prefix(reader->line, "filter ", &arg)) {
1075                         if (!data->filter_capability_requested)
1076                                 die("git upload-pack: filtering capability not negotiated");
1077                         list_objects_filter_die_if_populated(&data->filter_options);
1078                         parse_list_objects_filter(&data->filter_options, arg);
1079                         die_if_using_banned_filter(data);
1080                         continue;
1081                 }
1082
1083                 if (!skip_prefix(reader->line, "want ", &arg) ||
1084                     parse_oid_hex(arg, &oid_buf, &features))
1085                         die("git upload-pack: protocol error, "
1086                             "expected to get object ID, not '%s'", reader->line);
1087
1088                 if (parse_feature_request(features, "deepen-relative"))
1089                         data->deepen_relative = 1;
1090                 if (parse_feature_request(features, "multi_ack_detailed"))
1091                         data->multi_ack = MULTI_ACK_DETAILED;
1092                 else if (parse_feature_request(features, "multi_ack"))
1093                         data->multi_ack = MULTI_ACK;
1094                 if (parse_feature_request(features, "no-done"))
1095                         data->no_done = 1;
1096                 if (parse_feature_request(features, "thin-pack"))
1097                         data->use_thin_pack = 1;
1098                 if (parse_feature_request(features, "ofs-delta"))
1099                         data->use_ofs_delta = 1;
1100                 if (parse_feature_request(features, "side-band-64k"))
1101                         data->use_sideband = LARGE_PACKET_MAX;
1102                 else if (parse_feature_request(features, "side-band"))
1103                         data->use_sideband = DEFAULT_PACKET_MAX;
1104                 if (parse_feature_request(features, "no-progress"))
1105                         data->no_progress = 1;
1106                 if (parse_feature_request(features, "include-tag"))
1107                         data->use_include_tag = 1;
1108                 if (data->allow_filter &&
1109                     parse_feature_request(features, "filter"))
1110                         data->filter_capability_requested = 1;
1111
1112                 o = parse_object(the_repository, &oid_buf);
1113                 if (!o) {
1114                         packet_writer_error(&data->writer,
1115                                             "upload-pack: not our ref %s",
1116                                             oid_to_hex(&oid_buf));
1117                         die("git upload-pack: not our ref %s",
1118                             oid_to_hex(&oid_buf));
1119                 }
1120                 if (!(o->flags & WANTED)) {
1121                         o->flags |= WANTED;
1122                         if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1123                               || is_our_ref(o, data->allow_uor)))
1124                                 has_non_tip = 1;
1125                         add_object_array(o, NULL, &data->want_obj);
1126                 }
1127         }
1128
1129         /*
1130          * We have sent all our refs already, and the other end
1131          * should have chosen out of them. When we are operating
1132          * in the stateless RPC mode, however, their choice may
1133          * have been based on the set of older refs advertised
1134          * by another process that handled the initial request.
1135          */
1136         if (has_non_tip)
1137                 check_non_tip(data);
1138
1139         if (!data->use_sideband && data->daemon_mode)
1140                 data->no_progress = 1;
1141
1142         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1143                 return;
1144
1145         if (send_shallow_list(data))
1146                 packet_flush(1);
1147 }
1148
1149 /* return non-zero if the ref is hidden, otherwise 0 */
1150 static int mark_our_ref(const char *refname, const char *refname_full,
1151                         const struct object_id *oid)
1152 {
1153         struct object *o = lookup_unknown_object(oid);
1154
1155         if (ref_is_hidden(refname, refname_full)) {
1156                 o->flags |= HIDDEN_REF;
1157                 return 1;
1158         }
1159         o->flags |= OUR_REF;
1160         return 0;
1161 }
1162
1163 static int check_ref(const char *refname_full, const struct object_id *oid,
1164                      int flag, void *cb_data)
1165 {
1166         const char *refname = strip_namespace(refname_full);
1167
1168         mark_our_ref(refname, refname_full, oid);
1169         return 0;
1170 }
1171
1172 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1173 {
1174         struct string_list_item *item;
1175
1176         if (!symref->nr)
1177                 return;
1178         for_each_string_list_item(item, symref)
1179                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1180 }
1181
1182 static int send_ref(const char *refname, const struct object_id *oid,
1183                     int flag, void *cb_data)
1184 {
1185         static const char *capabilities = "multi_ack thin-pack side-band"
1186                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1187                 " deepen-relative no-progress include-tag multi_ack_detailed";
1188         const char *refname_nons = strip_namespace(refname);
1189         struct object_id peeled;
1190         struct upload_pack_data *data = cb_data;
1191
1192         if (mark_our_ref(refname_nons, refname, oid))
1193                 return 0;
1194
1195         if (capabilities) {
1196                 struct strbuf symref_info = STRBUF_INIT;
1197
1198                 format_symref_info(&symref_info, &data->symref);
1199                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s object-format=%s agent=%s\n",
1200                              oid_to_hex(oid), refname_nons,
1201                              0, capabilities,
1202                              (data->allow_uor & ALLOW_TIP_SHA1) ?
1203                                      " allow-tip-sha1-in-want" : "",
1204                              (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1205                                      " allow-reachable-sha1-in-want" : "",
1206                              data->stateless_rpc ? " no-done" : "",
1207                              symref_info.buf,
1208                              data->allow_filter ? " filter" : "",
1209                              the_hash_algo->name,
1210                              git_user_agent_sanitized());
1211                 strbuf_release(&symref_info);
1212         } else {
1213                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1214         }
1215         capabilities = NULL;
1216         if (!peel_ref(refname, &peeled))
1217                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1218         return 0;
1219 }
1220
1221 static int find_symref(const char *refname, const struct object_id *oid,
1222                        int flag, void *cb_data)
1223 {
1224         const char *symref_target;
1225         struct string_list_item *item;
1226
1227         if ((flag & REF_ISSYMREF) == 0)
1228                 return 0;
1229         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1230         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1231                 die("'%s' is a symref but it is not?", refname);
1232         item = string_list_append(cb_data, strip_namespace(refname));
1233         item->util = xstrdup(strip_namespace(symref_target));
1234         return 0;
1235 }
1236
1237 static int parse_object_filter_config(const char *var, const char *value,
1238                                        struct upload_pack_data *data)
1239 {
1240         struct strbuf buf = STRBUF_INIT;
1241         const char *sub, *key;
1242         size_t sub_len;
1243
1244         if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1245                 return 0;
1246
1247         if (!sub) {
1248                 if (!strcmp(key, "allow"))
1249                         data->allow_filter_fallback = git_config_bool(var, value);
1250                 return 0;
1251         }
1252
1253         strbuf_add(&buf, sub, sub_len);
1254
1255         if (!strcmp(key, "allow"))
1256                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1257                         (void *)(intptr_t)git_config_bool(var, value);
1258         else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1259                 if (!value) {
1260                         strbuf_release(&buf);
1261                         return config_error_nonbool(var);
1262                 }
1263                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1264                         (void *)(intptr_t)1;
1265                 data->tree_filter_max_depth = git_config_ulong(var, value);
1266         }
1267
1268         strbuf_release(&buf);
1269         return 0;
1270 }
1271
1272 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1273 {
1274         struct upload_pack_data *data = cb_data;
1275
1276         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1277                 if (git_config_bool(var, value))
1278                         data->allow_uor |= ALLOW_TIP_SHA1;
1279                 else
1280                         data->allow_uor &= ~ALLOW_TIP_SHA1;
1281         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1282                 if (git_config_bool(var, value))
1283                         data->allow_uor |= ALLOW_REACHABLE_SHA1;
1284                 else
1285                         data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1286         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1287                 if (git_config_bool(var, value))
1288                         data->allow_uor |= ALLOW_ANY_SHA1;
1289                 else
1290                         data->allow_uor &= ~ALLOW_ANY_SHA1;
1291         } else if (!strcmp("uploadpack.keepalive", var)) {
1292                 data->keepalive = git_config_int(var, value);
1293                 if (!data->keepalive)
1294                         data->keepalive = -1;
1295         } else if (!strcmp("uploadpack.allowfilter", var)) {
1296                 data->allow_filter = git_config_bool(var, value);
1297         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1298                 data->allow_ref_in_want = git_config_bool(var, value);
1299         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1300                 data->allow_sideband_all = git_config_bool(var, value);
1301         } else if (!strcmp("core.precomposeunicode", var)) {
1302                 precomposed_unicode = git_config_bool(var, value);
1303         }
1304
1305         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1306         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1307                 if (!strcmp("uploadpack.packobjectshook", var))
1308                         return git_config_string(&data->pack_objects_hook, var, value);
1309         }
1310
1311         parse_object_filter_config(var, value, data);
1312
1313         return parse_hide_refs_config(var, value, "uploadpack");
1314 }
1315
1316 void upload_pack(struct upload_pack_options *options)
1317 {
1318         struct packet_reader reader;
1319         struct upload_pack_data data;
1320
1321         upload_pack_data_init(&data);
1322
1323         git_config(upload_pack_config, &data);
1324
1325         data.stateless_rpc = options->stateless_rpc;
1326         data.daemon_mode = options->daemon_mode;
1327         data.timeout = options->timeout;
1328
1329         head_ref_namespaced(find_symref, &data.symref);
1330
1331         if (options->advertise_refs || !data.stateless_rpc) {
1332                 reset_timeout(data.timeout);
1333                 head_ref_namespaced(send_ref, &data);
1334                 for_each_namespaced_ref(send_ref, &data);
1335                 advertise_shallow_grafts(1);
1336                 packet_flush(1);
1337         } else {
1338                 head_ref_namespaced(check_ref, NULL);
1339                 for_each_namespaced_ref(check_ref, NULL);
1340         }
1341
1342         if (!options->advertise_refs) {
1343                 packet_reader_init(&reader, 0, NULL, 0,
1344                                    PACKET_READ_CHOMP_NEWLINE |
1345                                    PACKET_READ_DIE_ON_ERR_PACKET);
1346
1347                 receive_needs(&data, &reader);
1348
1349                 /*
1350                  * An EOF at this exact point in negotiation should be
1351                  * acceptable from stateless clients as they will consume the
1352                  * shallow list before doing subsequent rpc with haves/etc.
1353                  */
1354                 if (data.stateless_rpc)
1355                         reader.options |= PACKET_READ_GENTLE_ON_EOF;
1356
1357                 if (data.want_obj.nr &&
1358                     packet_reader_peek(&reader) != PACKET_READ_EOF) {
1359                         reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1360                         get_common_commits(&data, &reader);
1361                         create_pack_file(&data, NULL);
1362                 }
1363         }
1364
1365         upload_pack_data_clear(&data);
1366 }
1367
1368 static int parse_want(struct packet_writer *writer, const char *line,
1369                       struct object_array *want_obj)
1370 {
1371         const char *arg;
1372         if (skip_prefix(line, "want ", &arg)) {
1373                 struct object_id oid;
1374                 struct object *o;
1375
1376                 if (get_oid_hex(arg, &oid))
1377                         die("git upload-pack: protocol error, "
1378                             "expected to get oid, not '%s'", line);
1379
1380                 o = parse_object(the_repository, &oid);
1381                 if (!o) {
1382                         packet_writer_error(writer,
1383                                             "upload-pack: not our ref %s",
1384                                             oid_to_hex(&oid));
1385                         die("git upload-pack: not our ref %s",
1386                             oid_to_hex(&oid));
1387                 }
1388
1389                 if (!(o->flags & WANTED)) {
1390                         o->flags |= WANTED;
1391                         add_object_array(o, NULL, want_obj);
1392                 }
1393
1394                 return 1;
1395         }
1396
1397         return 0;
1398 }
1399
1400 static int parse_want_ref(struct packet_writer *writer, const char *line,
1401                           struct string_list *wanted_refs,
1402                           struct object_array *want_obj)
1403 {
1404         const char *arg;
1405         if (skip_prefix(line, "want-ref ", &arg)) {
1406                 struct object_id oid;
1407                 struct string_list_item *item;
1408                 struct object *o;
1409
1410                 if (read_ref(arg, &oid)) {
1411                         packet_writer_error(writer, "unknown ref %s", arg);
1412                         die("unknown ref %s", arg);
1413                 }
1414
1415                 item = string_list_append(wanted_refs, arg);
1416                 item->util = oiddup(&oid);
1417
1418                 o = parse_object_or_die(&oid, arg);
1419                 if (!(o->flags & WANTED)) {
1420                         o->flags |= WANTED;
1421                         add_object_array(o, NULL, want_obj);
1422                 }
1423
1424                 return 1;
1425         }
1426
1427         return 0;
1428 }
1429
1430 static int parse_have(const char *line, struct oid_array *haves)
1431 {
1432         const char *arg;
1433         if (skip_prefix(line, "have ", &arg)) {
1434                 struct object_id oid;
1435
1436                 if (get_oid_hex(arg, &oid))
1437                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1438                 oid_array_append(haves, &oid);
1439                 return 1;
1440         }
1441
1442         return 0;
1443 }
1444
1445 static void process_args(struct packet_reader *request,
1446                          struct upload_pack_data *data)
1447 {
1448         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1449                 const char *arg = request->line;
1450                 const char *p;
1451
1452                 /* process want */
1453                 if (parse_want(&data->writer, arg, &data->want_obj))
1454                         continue;
1455                 if (data->allow_ref_in_want &&
1456                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1457                                    &data->want_obj))
1458                         continue;
1459                 /* process have line */
1460                 if (parse_have(arg, &data->haves))
1461                         continue;
1462
1463                 /* process args like thin-pack */
1464                 if (!strcmp(arg, "thin-pack")) {
1465                         data->use_thin_pack = 1;
1466                         continue;
1467                 }
1468                 if (!strcmp(arg, "ofs-delta")) {
1469                         data->use_ofs_delta = 1;
1470                         continue;
1471                 }
1472                 if (!strcmp(arg, "no-progress")) {
1473                         data->no_progress = 1;
1474                         continue;
1475                 }
1476                 if (!strcmp(arg, "include-tag")) {
1477                         data->use_include_tag = 1;
1478                         continue;
1479                 }
1480                 if (!strcmp(arg, "done")) {
1481                         data->done = 1;
1482                         continue;
1483                 }
1484
1485                 /* Shallow related arguments */
1486                 if (process_shallow(arg, &data->shallows))
1487                         continue;
1488                 if (process_deepen(arg, &data->depth))
1489                         continue;
1490                 if (process_deepen_since(arg, &data->deepen_since,
1491                                          &data->deepen_rev_list))
1492                         continue;
1493                 if (process_deepen_not(arg, &data->deepen_not,
1494                                        &data->deepen_rev_list))
1495                         continue;
1496                 if (!strcmp(arg, "deepen-relative")) {
1497                         data->deepen_relative = 1;
1498                         continue;
1499                 }
1500
1501                 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1502                         list_objects_filter_die_if_populated(&data->filter_options);
1503                         parse_list_objects_filter(&data->filter_options, p);
1504                         die_if_using_banned_filter(data);
1505                         continue;
1506                 }
1507
1508                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1509                      data->allow_sideband_all) &&
1510                     !strcmp(arg, "sideband-all")) {
1511                         data->writer.use_sideband = 1;
1512                         continue;
1513                 }
1514
1515                 if (skip_prefix(arg, "packfile-uris ", &p)) {
1516                         string_list_split(&data->uri_protocols, p, ',', -1);
1517                         continue;
1518                 }
1519
1520                 /* ignore unknown lines maybe? */
1521                 die("unexpected line: '%s'", arg);
1522         }
1523
1524         if (data->uri_protocols.nr && !data->writer.use_sideband)
1525                 string_list_clear(&data->uri_protocols, 0);
1526
1527         if (request->status != PACKET_READ_FLUSH)
1528                 die(_("expected flush after fetch arguments"));
1529 }
1530
1531 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1532 {
1533         int i;
1534
1535         /* Process haves */
1536         for (i = 0; i < data->haves.nr; i++) {
1537                 const struct object_id *oid = &data->haves.oid[i];
1538
1539                 if (!has_object_file_with_flags(oid,
1540                                                 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1541                         continue;
1542
1543                 oid_array_append(common, oid);
1544
1545                 do_got_oid(data, oid);
1546         }
1547
1548         return 0;
1549 }
1550
1551 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1552 {
1553         int i;
1554
1555         packet_writer_write(&data->writer, "acknowledgments\n");
1556
1557         /* Send Acks */
1558         if (!acks->nr)
1559                 packet_writer_write(&data->writer, "NAK\n");
1560
1561         for (i = 0; i < acks->nr; i++) {
1562                 packet_writer_write(&data->writer, "ACK %s\n",
1563                                     oid_to_hex(&acks->oid[i]));
1564         }
1565
1566         if (ok_to_give_up(data)) {
1567                 /* Send Ready */
1568                 packet_writer_write(&data->writer, "ready\n");
1569                 return 1;
1570         }
1571
1572         return 0;
1573 }
1574
1575 static int process_haves_and_send_acks(struct upload_pack_data *data)
1576 {
1577         struct oid_array common = OID_ARRAY_INIT;
1578         int ret = 0;
1579
1580         process_haves(data, &common);
1581         if (data->done) {
1582                 ret = 1;
1583         } else if (send_acks(data, &common)) {
1584                 packet_writer_delim(&data->writer);
1585                 ret = 1;
1586         } else {
1587                 /* Add Flush */
1588                 packet_writer_flush(&data->writer);
1589                 ret = 0;
1590         }
1591
1592         oid_array_clear(&data->haves);
1593         oid_array_clear(&common);
1594         return ret;
1595 }
1596
1597 static void send_wanted_ref_info(struct upload_pack_data *data)
1598 {
1599         const struct string_list_item *item;
1600
1601         if (!data->wanted_refs.nr)
1602                 return;
1603
1604         packet_writer_write(&data->writer, "wanted-refs\n");
1605
1606         for_each_string_list_item(item, &data->wanted_refs) {
1607                 packet_writer_write(&data->writer, "%s %s\n",
1608                                     oid_to_hex(item->util),
1609                                     item->string);
1610         }
1611
1612         packet_writer_delim(&data->writer);
1613 }
1614
1615 static void send_shallow_info(struct upload_pack_data *data)
1616 {
1617         /* No shallow info needs to be sent */
1618         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1619             !is_repository_shallow(the_repository))
1620                 return;
1621
1622         packet_writer_write(&data->writer, "shallow-info\n");
1623
1624         if (!send_shallow_list(data) &&
1625             is_repository_shallow(the_repository))
1626                 deepen(data, INFINITE_DEPTH);
1627
1628         packet_delim(1);
1629 }
1630
1631 enum fetch_state {
1632         FETCH_PROCESS_ARGS = 0,
1633         FETCH_SEND_ACKS,
1634         FETCH_SEND_PACK,
1635         FETCH_DONE,
1636 };
1637
1638 int upload_pack_v2(struct repository *r, struct strvec *keys,
1639                    struct packet_reader *request)
1640 {
1641         enum fetch_state state = FETCH_PROCESS_ARGS;
1642         struct upload_pack_data data;
1643
1644         clear_object_flags(ALL_FLAGS);
1645
1646         upload_pack_data_init(&data);
1647         data.use_sideband = LARGE_PACKET_MAX;
1648
1649         git_config(upload_pack_config, &data);
1650
1651         while (state != FETCH_DONE) {
1652                 switch (state) {
1653                 case FETCH_PROCESS_ARGS:
1654                         process_args(request, &data);
1655
1656                         if (!data.want_obj.nr) {
1657                                 /*
1658                                  * Request didn't contain any 'want' lines,
1659                                  * guess they didn't want anything.
1660                                  */
1661                                 state = FETCH_DONE;
1662                         } else if (data.haves.nr) {
1663                                 /*
1664                                  * Request had 'have' lines, so lets ACK them.
1665                                  */
1666                                 state = FETCH_SEND_ACKS;
1667                         } else {
1668                                 /*
1669                                  * Request had 'want's but no 'have's so we can
1670                                  * immedietly go to construct and send a pack.
1671                                  */
1672                                 state = FETCH_SEND_PACK;
1673                         }
1674                         break;
1675                 case FETCH_SEND_ACKS:
1676                         if (process_haves_and_send_acks(&data))
1677                                 state = FETCH_SEND_PACK;
1678                         else
1679                                 state = FETCH_DONE;
1680                         break;
1681                 case FETCH_SEND_PACK:
1682                         send_wanted_ref_info(&data);
1683                         send_shallow_info(&data);
1684
1685                         if (data.uri_protocols.nr) {
1686                                 create_pack_file(&data, &data.uri_protocols);
1687                         } else {
1688                                 packet_writer_write(&data.writer, "packfile\n");
1689                                 create_pack_file(&data, NULL);
1690                         }
1691                         state = FETCH_DONE;
1692                         break;
1693                 case FETCH_DONE:
1694                         continue;
1695                 }
1696         }
1697
1698         upload_pack_data_clear(&data);
1699         return 0;
1700 }
1701
1702 int upload_pack_advertise(struct repository *r,
1703                           struct strbuf *value)
1704 {
1705         if (value) {
1706                 int allow_filter_value;
1707                 int allow_ref_in_want;
1708                 int allow_sideband_all_value;
1709                 char *str = NULL;
1710
1711                 strbuf_addstr(value, "shallow");
1712
1713                 if (!repo_config_get_bool(the_repository,
1714                                          "uploadpack.allowfilter",
1715                                          &allow_filter_value) &&
1716                     allow_filter_value)
1717                         strbuf_addstr(value, " filter");
1718
1719                 if (!repo_config_get_bool(the_repository,
1720                                          "uploadpack.allowrefinwant",
1721                                          &allow_ref_in_want) &&
1722                     allow_ref_in_want)
1723                         strbuf_addstr(value, " ref-in-want");
1724
1725                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1726                     (!repo_config_get_bool(the_repository,
1727                                            "uploadpack.allowsidebandall",
1728                                            &allow_sideband_all_value) &&
1729                      allow_sideband_all_value))
1730                         strbuf_addstr(value, " sideband-all");
1731
1732                 if (!repo_config_get_string(the_repository,
1733                                             "uploadpack.blobpackfileuri",
1734                                             &str) &&
1735                     str) {
1736                         strbuf_addstr(value, " packfile-uris");
1737                         free(str);
1738                 }
1739         }
1740
1741         return 1;
1742 }