git.oblomov.eu Git - git/blob - upload-pack.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "repository.h"
   7 #include "object-store.h"
   8 #include "tag.h"
   9 #include "object.h"
  10 #include "commit.h"
  11 #include "diff.h"
  12 #include "revision.h"
  13 #include "list-objects.h"
  14 #include "list-objects-filter.h"
  15 #include "list-objects-filter-options.h"
  16 #include "run-command.h"
  17 #include "connect.h"
  18 #include "sigchain.h"
  19 #include "version.h"
  20 #include "string-list.h"
  21 #include "argv-array.h"
  22 #include "prio-queue.h"
  23 #include "protocol.h"
  24 #include "quote.h"
  25 #include "upload-pack.h"
  26 #include "serve.h"
  27 #include "commit-graph.h"
  28 #include "commit-reach.h"
  29 #include "shallow.h"
  30
  31 /* Remember to update object flag allocation in object.h */
  32 #define THEY_HAVE       (1u << 11)
  33 #define OUR_REF         (1u << 12)
  34 #define WANTED          (1u << 13)
  35 #define COMMON_KNOWN    (1u << 14)
  36
  37 #define SHALLOW         (1u << 16)
  38 #define NOT_SHALLOW     (1u << 17)
  39 #define CLIENT_SHALLOW  (1u << 18)
  40 #define HIDDEN_REF      (1u << 19)
  41
  42 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
  43                 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
  44
  45 /* 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
 109         unsigned done : 1;                                      /* v2 only */
 110         unsigned allow_ref_in_want : 1;                         /* v2 only */
 111         unsigned allow_sideband_all : 1;                        /* v2 only */
 112 };
 113
 114 static void upload_pack_data_init(struct upload_pack_data *data)
 115 {
 116         struct string_list symref = STRING_LIST_INIT_DUP;
 117         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 118         struct object_array want_obj = OBJECT_ARRAY_INIT;
 119         struct object_array have_obj = OBJECT_ARRAY_INIT;
 120         struct oid_array haves = OID_ARRAY_INIT;
 121         struct object_array shallows = OBJECT_ARRAY_INIT;
 122         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 123         struct string_list uri_protocols = STRING_LIST_INIT_DUP;
 124         struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
 125         struct string_list allowed_filters = STRING_LIST_INIT_DUP;
 126
 127         memset(data, 0, sizeof(*data));
 128         data->symref = symref;
 129         data->wanted_refs = wanted_refs;
 130         data->want_obj = want_obj;
 131         data->have_obj = have_obj;
 132         data->haves = haves;
 133         data->shallows = shallows;
 134         data->deepen_not = deepen_not;
 135         data->uri_protocols = uri_protocols;
 136         data->extra_edge_obj = extra_edge_obj;
 137         data->allowed_filters = allowed_filters;
 138         data->allow_filter_fallback = 1;
 139         packet_writer_init(&data->writer, 1);
 140
 141         data->keepalive = 5;
 142 }
 143
 144 static void upload_pack_data_clear(struct upload_pack_data *data)
 145 {
 146         string_list_clear(&data->symref, 1);
 147         string_list_clear(&data->wanted_refs, 1);
 148         object_array_clear(&data->want_obj);
 149         object_array_clear(&data->have_obj);
 150         oid_array_clear(&data->haves);
 151         object_array_clear(&data->shallows);
 152         string_list_clear(&data->deepen_not, 0);
 153         object_array_clear(&data->extra_edge_obj);
 154         list_objects_filter_release(&data->filter_options);
 155         string_list_clear(&data->allowed_filters, 1);
 156
 157         free((char *)data->pack_objects_hook);
 158 }
 159
 160 static void reset_timeout(unsigned int timeout)
 161 {
 162         alarm(timeout);
 163 }
 164
 165 static void send_client_data(int fd, const char *data, ssize_t sz,
 166                              int use_sideband)
 167 {
 168         if (use_sideband) {
 169                 send_sideband(1, fd, data, sz, use_sideband);
 170                 return;
 171         }
 172         if (fd == 3)
 173                 /* emergency quit */
 174                 fd = 2;
 175         if (fd == 2) {
 176                 /* XXX: are we happy to lose stuff here? */
 177                 xwrite(fd, data, sz);
 178                 return;
 179         }
 180         write_or_die(fd, data, sz);
 181 }
 182
 183 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 184 {
 185         FILE *fp = cb_data;
 186         if (graft->nr_parent == -1)
 187                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 188         return 0;
 189 }
 190
 191 struct output_state {
 192         char buffer[8193];
 193         int used;
 194         unsigned packfile_uris_started : 1;
 195         unsigned packfile_started : 1;
 196 };
 197
 198 static int relay_pack_data(int pack_objects_out, struct output_state *os,
 199                            int use_sideband, int write_packfile_line)
 200 {
 201         /*
 202          * We keep the last byte to ourselves
 203          * in case we detect broken rev-list, so that we
 204          * can leave the stream corrupted.  This is
 205          * unfortunate -- unpack-objects would happily
 206          * accept a valid packdata with trailing garbage,
 207          * so appending garbage after we pass all the
 208          * pack data is not good enough to signal
 209          * breakage to downstream.
 210          */
 211         ssize_t readsz;
 212
 213         readsz = xread(pack_objects_out, os->buffer + os->used,
 214                        sizeof(os->buffer) - os->used);
 215         if (readsz < 0) {
 216                 return readsz;
 217         }
 218         os->used += readsz;
 219
 220         while (!os->packfile_started) {
 221                 char *p;
 222                 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
 223                         os->packfile_started = 1;
 224                         if (write_packfile_line) {
 225                                 if (os->packfile_uris_started)
 226                                         packet_delim(1);
 227                                 packet_write_fmt(1, "\1packfile\n");
 228                         }
 229                         break;
 230                 }
 231                 if ((p = memchr(os->buffer, '\n', os->used))) {
 232                         if (!os->packfile_uris_started) {
 233                                 os->packfile_uris_started = 1;
 234                                 if (!write_packfile_line)
 235                                         BUG("packfile_uris requires sideband-all");
 236                                 packet_write_fmt(1, "\1packfile-uris\n");
 237                         }
 238                         *p = '\0';
 239                         packet_write_fmt(1, "\1%s\n", os->buffer);
 240
 241                         os->used -= p - os->buffer + 1;
 242                         memmove(os->buffer, p + 1, os->used);
 243                 } else {
 244                         /*
 245                          * Incomplete line.
 246                          */
 247                         return readsz;
 248                 }
 249         }
 250
 251         if (os->used > 1) {
 252                 send_client_data(1, os->buffer, os->used - 1, use_sideband);
 253                 os->buffer[0] = os->buffer[os->used - 1];
 254                 os->used = 1;
 255         } else {
 256                 send_client_data(1, os->buffer, os->used, use_sideband);
 257                 os->used = 0;
 258         }
 259
 260         return readsz;
 261 }
 262
 263 static void create_pack_file(struct upload_pack_data *pack_data,
 264                              const struct string_list *uri_protocols)
 265 {
 266         struct child_process pack_objects = CHILD_PROCESS_INIT;
 267         struct output_state output_state = { { 0 } };
 268         char progress[128];
 269         char abort_msg[] = "aborting due to possible repository "
 270                 "corruption on the remote side.";
 271         ssize_t sz;
 272         int i;
 273         FILE *pipe_fd;
 274
 275         if (!pack_data->pack_objects_hook)
 276                 pack_objects.git_cmd = 1;
 277         else {
 278                 argv_array_push(&pack_objects.args, pack_data->pack_objects_hook);
 279                 argv_array_push(&pack_objects.args, "git");
 280                 pack_objects.use_shell = 1;
 281         }
 282
 283         if (pack_data->shallow_nr) {
 284                 argv_array_push(&pack_objects.args, "--shallow-file");
 285                 argv_array_push(&pack_objects.args, "");
 286         }
 287         argv_array_push(&pack_objects.args, "pack-objects");
 288         argv_array_push(&pack_objects.args, "--revs");
 289         if (pack_data->use_thin_pack)
 290                 argv_array_push(&pack_objects.args, "--thin");
 291
 292         argv_array_push(&pack_objects.args, "--stdout");
 293         if (pack_data->shallow_nr)
 294                 argv_array_push(&pack_objects.args, "--shallow");
 295         if (!pack_data->no_progress)
 296                 argv_array_push(&pack_objects.args, "--progress");
 297         if (pack_data->use_ofs_delta)
 298                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 299         if (pack_data->use_include_tag)
 300                 argv_array_push(&pack_objects.args, "--include-tag");
 301         if (pack_data->filter_options.choice) {
 302                 const char *spec =
 303                         expand_list_objects_filter_spec(&pack_data->filter_options);
 304                 if (pack_objects.use_shell) {
 305                         struct strbuf buf = STRBUF_INIT;
 306                         sq_quote_buf(&buf, spec);
 307                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 308                         strbuf_release(&buf);
 309                 } else {
 310                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 311                                          spec);
 312                 }
 313         }
 314         if (uri_protocols) {
 315                 for (i = 0; i < uri_protocols->nr; i++)
 316                         argv_array_pushf(&pack_objects.args, "--uri-protocol=%s",
 317                                          uri_protocols->items[i].string);
 318         }
 319
 320         pack_objects.in = -1;
 321         pack_objects.out = -1;
 322         pack_objects.err = -1;
 323
 324         if (start_command(&pack_objects))
 325                 die("git upload-pack: unable to fork git-pack-objects");
 326
 327         pipe_fd = xfdopen(pack_objects.in, "w");
 328
 329         if (pack_data->shallow_nr)
 330                 for_each_commit_graft(write_one_shallow, pipe_fd);
 331
 332         for (i = 0; i < pack_data->want_obj.nr; i++)
 333                 fprintf(pipe_fd, "%s\n",
 334                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 335         fprintf(pipe_fd, "--not\n");
 336         for (i = 0; i < pack_data->have_obj.nr; i++)
 337                 fprintf(pipe_fd, "%s\n",
 338                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 339         for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
 340                 fprintf(pipe_fd, "%s\n",
 341                         oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
 342         fprintf(pipe_fd, "\n");
 343         fflush(pipe_fd);
 344         fclose(pipe_fd);
 345
 346         /* We read from pack_objects.err to capture stderr output for
 347          * progress bar, and pack_objects.out to capture the pack data.
 348          */
 349
 350         while (1) {
 351                 struct pollfd pfd[2];
 352                 int pe, pu, pollsize, polltimeout;
 353                 int ret;
 354
 355                 reset_timeout(pack_data->timeout);
 356
 357                 pollsize = 0;
 358                 pe = pu = -1;
 359
 360                 if (0 <= pack_objects.out) {
 361                         pfd[pollsize].fd = pack_objects.out;
 362                         pfd[pollsize].events = POLLIN;
 363                         pu = pollsize;
 364                         pollsize++;
 365                 }
 366                 if (0 <= pack_objects.err) {
 367                         pfd[pollsize].fd = pack_objects.err;
 368                         pfd[pollsize].events = POLLIN;
 369                         pe = pollsize;
 370                         pollsize++;
 371                 }
 372
 373                 if (!pollsize)
 374                         break;
 375
 376                 polltimeout = pack_data->keepalive < 0
 377                         ? -1
 378                         : 1000 * pack_data->keepalive;
 379
 380                 ret = poll(pfd, pollsize, polltimeout);
 381
 382                 if (ret < 0) {
 383                         if (errno != EINTR) {
 384                                 error_errno("poll failed, resuming");
 385                                 sleep(1);
 386                         }
 387                         continue;
 388                 }
 389                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 390                         /* Status ready; we ship that in the side-band
 391                          * or dump to the standard error.
 392                          */
 393                         sz = xread(pack_objects.err, progress,
 394                                   sizeof(progress));
 395                         if (0 < sz)
 396                                 send_client_data(2, progress, sz,
 397                                                  pack_data->use_sideband);
 398                         else if (sz == 0) {
 399                                 close(pack_objects.err);
 400                                 pack_objects.err = -1;
 401                         }
 402                         else
 403                                 goto fail;
 404                         /* give priority to status messages */
 405                         continue;
 406                 }
 407                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 408                         int result = relay_pack_data(pack_objects.out,
 409                                                      &output_state,
 410                                                      pack_data->use_sideband,
 411                                                      !!uri_protocols);
 412
 413                         if (result == 0) {
 414                                 close(pack_objects.out);
 415                                 pack_objects.out = -1;
 416                         } else if (result < 0) {
 417                                 goto fail;
 418                         }
 419                 }
 420
 421                 /*
 422                  * We hit the keepalive timeout without saying anything; send
 423                  * an empty message on the data sideband just to let the other
 424                  * side know we're still working on it, but don't have any data
 425                  * yet.
 426                  *
 427                  * If we don't have a sideband channel, there's no room in the
 428                  * protocol to say anything, so those clients are just out of
 429                  * luck.
 430                  */
 431                 if (!ret && pack_data->use_sideband) {
 432                         static const char buf[] = "0005\1";
 433                         write_or_die(1, buf, 5);
 434                 }
 435         }
 436
 437         if (finish_command(&pack_objects)) {
 438                 error("git upload-pack: git-pack-objects died with error.");
 439                 goto fail;
 440         }
 441
 442         /* flush the data */
 443         if (output_state.used > 0) {
 444                 send_client_data(1, output_state.buffer, output_state.used,
 445                                  pack_data->use_sideband);
 446                 fprintf(stderr, "flushed.\n");
 447         }
 448         if (pack_data->use_sideband)
 449                 packet_flush(1);
 450         return;
 451
 452  fail:
 453         send_client_data(3, abort_msg, sizeof(abort_msg),
 454                          pack_data->use_sideband);
 455         die("git upload-pack: %s", abort_msg);
 456 }
 457
 458 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
 459 {
 460         int we_knew_they_have = 0;
 461         struct object *o = parse_object(the_repository, oid);
 462
 463         if (!o)
 464                 die("oops (%s)", oid_to_hex(oid));
 465         if (o->type == OBJ_COMMIT) {
 466                 struct commit_list *parents;
 467                 struct commit *commit = (struct commit *)o;
 468                 if (o->flags & THEY_HAVE)
 469                         we_knew_they_have = 1;
 470                 else
 471                         o->flags |= THEY_HAVE;
 472                 if (!data->oldest_have || (commit->date < data->oldest_have))
 473                         data->oldest_have = commit->date;
 474                 for (parents = commit->parents;
 475                      parents;
 476                      parents = parents->next)
 477                         parents->item->object.flags |= THEY_HAVE;
 478         }
 479         if (!we_knew_they_have) {
 480                 add_object_array(o, NULL, &data->have_obj);
 481                 return 1;
 482         }
 483         return 0;
 484 }
 485
 486 static int got_oid(struct upload_pack_data *data,
 487                    const char *hex, struct object_id *oid)
 488 {
 489         if (get_oid_hex(hex, oid))
 490                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 491         if (!has_object_file(oid))
 492                 return -1;
 493         return do_got_oid(data, oid);
 494 }
 495
 496 static int ok_to_give_up(struct upload_pack_data *data)
 497 {
 498         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 499
 500         if (!data->have_obj.nr)
 501                 return 0;
 502
 503         return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
 504                                             COMMON_KNOWN, data->oldest_have,
 505                                             min_generation);
 506 }
 507
 508 static int get_common_commits(struct upload_pack_data *data,
 509                               struct packet_reader *reader)
 510 {
 511         struct object_id oid;
 512         char last_hex[GIT_MAX_HEXSZ + 1];
 513         int got_common = 0;
 514         int got_other = 0;
 515         int sent_ready = 0;
 516
 517         save_commit_buffer = 0;
 518
 519         for (;;) {
 520                 const char *arg;
 521
 522                 reset_timeout(data->timeout);
 523
 524                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 525                         if (data->multi_ack == MULTI_ACK_DETAILED
 526                             && got_common
 527                             && !got_other
 528                             && ok_to_give_up(data)) {
 529                                 sent_ready = 1;
 530                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 531                         }
 532                         if (data->have_obj.nr == 0 || data->multi_ack)
 533                                 packet_write_fmt(1, "NAK\n");
 534
 535                         if (data->no_done && sent_ready) {
 536                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 537                                 return 0;
 538                         }
 539                         if (data->stateless_rpc)
 540                                 exit(0);
 541                         got_common = 0;
 542                         got_other = 0;
 543                         continue;
 544                 }
 545                 if (skip_prefix(reader->line, "have ", &arg)) {
 546                         switch (got_oid(data, arg, &oid)) {
 547                         case -1: /* they have what we do not */
 548                                 got_other = 1;
 549                                 if (data->multi_ack
 550                                     && ok_to_give_up(data)) {
 551                                         const char *hex = oid_to_hex(&oid);
 552                                         if (data->multi_ack == MULTI_ACK_DETAILED) {
 553                                                 sent_ready = 1;
 554                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 555                                         } else
 556                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 557                                 }
 558                                 break;
 559                         default:
 560                                 got_common = 1;
 561                                 oid_to_hex_r(last_hex, &oid);
 562                                 if (data->multi_ack == MULTI_ACK_DETAILED)
 563                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 564                                 else if (data->multi_ack)
 565                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 566                                 else if (data->have_obj.nr == 1)
 567                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 568                                 break;
 569                         }
 570                         continue;
 571                 }
 572                 if (!strcmp(reader->line, "done")) {
 573                         if (data->have_obj.nr > 0) {
 574                                 if (data->multi_ack)
 575                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 576                                 return 0;
 577                         }
 578                         packet_write_fmt(1, "NAK\n");
 579                         return -1;
 580                 }
 581                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 582         }
 583 }
 584
 585 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
 586 {
 587         int allow_hidden_ref = (allow_uor &
 588                                 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 589         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 590 }
 591
 592 /*
 593  * on successful case, it's up to the caller to close cmd->out
 594  */
 595 static int do_reachable_revlist(struct child_process *cmd,
 596                                 struct object_array *src,
 597                                 struct object_array *reachable,
 598                                 enum allow_uor allow_uor)
 599 {
 600         static const char *argv[] = {
 601                 "rev-list", "--stdin", NULL,
 602         };
 603         struct object *o;
 604         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 605         int i;
 606         const unsigned hexsz = the_hash_algo->hexsz;
 607
 608         cmd->argv = argv;
 609         cmd->git_cmd = 1;
 610         cmd->no_stderr = 1;
 611         cmd->in = -1;
 612         cmd->out = -1;
 613
 614         /*
 615          * If the next rev-list --stdin encounters an unknown commit,
 616          * it terminates, which will cause SIGPIPE in the write loop
 617          * below.
 618          */
 619         sigchain_push(SIGPIPE, SIG_IGN);
 620
 621         if (start_command(cmd))
 622                 goto error;
 623
 624         namebuf[0] = '^';
 625         namebuf[hexsz + 1] = '\n';
 626         for (i = get_max_object_index(); 0 < i; ) {
 627                 o = get_indexed_object(--i);
 628                 if (!o)
 629                         continue;
 630                 if (reachable && o->type == OBJ_COMMIT)
 631                         o->flags &= ~TMP_MARK;
 632                 if (!is_our_ref(o, allow_uor))
 633                         continue;
 634                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 635                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 636                         goto error;
 637         }
 638         namebuf[hexsz] = '\n';
 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                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 649                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 650                         goto error;
 651         }
 652         close(cmd->in);
 653         cmd->in = -1;
 654         sigchain_pop(SIGPIPE);
 655
 656         return 0;
 657
 658 error:
 659         sigchain_pop(SIGPIPE);
 660
 661         if (cmd->in >= 0)
 662                 close(cmd->in);
 663         if (cmd->out >= 0)
 664                 close(cmd->out);
 665         return -1;
 666 }
 667
 668 static int get_reachable_list(struct upload_pack_data *data,
 669                               struct object_array *reachable)
 670 {
 671         struct child_process cmd = CHILD_PROCESS_INIT;
 672         int i;
 673         struct object *o;
 674         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 675         const unsigned hexsz = the_hash_algo->hexsz;
 676
 677         if (do_reachable_revlist(&cmd, &data->shallows, reachable,
 678                                  data->allow_uor) < 0)
 679                 return -1;
 680
 681         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 682                 struct object_id oid;
 683                 const char *p;
 684
 685                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 686                         break;
 687
 688                 o = lookup_object(the_repository, &oid);
 689                 if (o && o->type == OBJ_COMMIT) {
 690                         o->flags &= ~TMP_MARK;
 691                 }
 692         }
 693         for (i = get_max_object_index(); 0 < i; i--) {
 694                 o = get_indexed_object(i - 1);
 695                 if (o && o->type == OBJ_COMMIT &&
 696                     (o->flags & TMP_MARK)) {
 697                         add_object_array(o, NULL, reachable);
 698                                 o->flags &= ~TMP_MARK;
 699                 }
 700         }
 701         close(cmd.out);
 702
 703         if (finish_command(&cmd))
 704                 return -1;
 705
 706         return 0;
 707 }
 708
 709 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
 710 {
 711         struct child_process cmd = CHILD_PROCESS_INIT;
 712         char buf[1];
 713         int i;
 714
 715         if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
 716                 return 1;
 717
 718         /*
 719          * The commits out of the rev-list are not ancestors of
 720          * our ref.
 721          */
 722         i = read_in_full(cmd.out, buf, 1);
 723         if (i)
 724                 goto error;
 725         close(cmd.out);
 726         cmd.out = -1;
 727
 728         /*
 729          * rev-list may have died by encountering a bad commit
 730          * in the history, in which case we do want to bail out
 731          * even when it showed no commit.
 732          */
 733         if (finish_command(&cmd))
 734                 goto error;
 735
 736         /* All the non-tip ones are ancestors of what we advertised */
 737         return 0;
 738
 739 error:
 740         sigchain_pop(SIGPIPE);
 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 argv_array av = ARGV_ARRAY_INIT;
 890                 int i;
 891
 892                 argv_array_push(&av, "rev-list");
 893                 if (data->deepen_since)
 894                         argv_array_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
 895                 if (data->deepen_not.nr) {
 896                         argv_array_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                                 argv_array_push(&av, s->string);
 900                         }
 901                         argv_array_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                         argv_array_push(&av, oid_to_hex(&o->oid));
 906                 }
 907                 deepen_by_rev_list(data, av.argc, av.argv);
 908                 argv_array_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
1024 static void check_filter_recurse(struct upload_pack_data *data,
1025                                  struct list_objects_filter_options *opts)
1026 {
1027         size_t i;
1028
1029         check_one_filter(data, opts);
1030         if (opts->choice != LOFC_COMBINE)
1031                 return;
1032
1033         for (i = 0; i < opts->sub_nr; i++)
1034                 check_filter_recurse(data, &opts->sub[i]);
1035 }
1036
1037 static void die_if_using_banned_filter(struct upload_pack_data *data)
1038 {
1039         check_filter_recurse(data, &data->filter_options);
1040 }
1041
1042 static void receive_needs(struct upload_pack_data *data,
1043                           struct packet_reader *reader)
1044 {
1045         int has_non_tip = 0;
1046
1047         data->shallow_nr = 0;
1048         for (;;) {
1049                 struct object *o;
1050                 const char *features;
1051                 struct object_id oid_buf;
1052                 const char *arg;
1053
1054                 reset_timeout(data->timeout);
1055                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1056                         break;
1057
1058                 if (process_shallow(reader->line, &data->shallows))
1059                         continue;
1060                 if (process_deepen(reader->line, &data->depth))
1061                         continue;
1062                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1063                         continue;
1064                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1065                         continue;
1066
1067                 if (skip_prefix(reader->line, "filter ", &arg)) {
1068                         if (!data->filter_capability_requested)
1069                                 die("git upload-pack: filtering capability not negotiated");
1070                         list_objects_filter_die_if_populated(&data->filter_options);
1071                         parse_list_objects_filter(&data->filter_options, arg);
1072                         die_if_using_banned_filter(data);
1073                         continue;
1074                 }
1075
1076                 if (!skip_prefix(reader->line, "want ", &arg) ||
1077                     parse_oid_hex(arg, &oid_buf, &features))
1078                         die("git upload-pack: protocol error, "
1079                             "expected to get object ID, not '%s'", reader->line);
1080
1081                 if (parse_feature_request(features, "deepen-relative"))
1082                         data->deepen_relative = 1;
1083                 if (parse_feature_request(features, "multi_ack_detailed"))
1084                         data->multi_ack = MULTI_ACK_DETAILED;
1085                 else if (parse_feature_request(features, "multi_ack"))
1086                         data->multi_ack = MULTI_ACK;
1087                 if (parse_feature_request(features, "no-done"))
1088                         data->no_done = 1;
1089                 if (parse_feature_request(features, "thin-pack"))
1090                         data->use_thin_pack = 1;
1091                 if (parse_feature_request(features, "ofs-delta"))
1092                         data->use_ofs_delta = 1;
1093                 if (parse_feature_request(features, "side-band-64k"))
1094                         data->use_sideband = LARGE_PACKET_MAX;
1095                 else if (parse_feature_request(features, "side-band"))
1096                         data->use_sideband = DEFAULT_PACKET_MAX;
1097                 if (parse_feature_request(features, "no-progress"))
1098                         data->no_progress = 1;
1099                 if (parse_feature_request(features, "include-tag"))
1100                         data->use_include_tag = 1;
1101                 if (data->allow_filter &&
1102                     parse_feature_request(features, "filter"))
1103                         data->filter_capability_requested = 1;
1104
1105                 o = parse_object(the_repository, &oid_buf);
1106                 if (!o) {
1107                         packet_writer_error(&data->writer,
1108                                             "upload-pack: not our ref %s",
1109                                             oid_to_hex(&oid_buf));
1110                         die("git upload-pack: not our ref %s",
1111                             oid_to_hex(&oid_buf));
1112                 }
1113                 if (!(o->flags & WANTED)) {
1114                         o->flags |= WANTED;
1115                         if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1116                               || is_our_ref(o, data->allow_uor)))
1117                                 has_non_tip = 1;
1118                         add_object_array(o, NULL, &data->want_obj);
1119                 }
1120         }
1121
1122         /*
1123          * We have sent all our refs already, and the other end
1124          * should have chosen out of them. When we are operating
1125          * in the stateless RPC mode, however, their choice may
1126          * have been based on the set of older refs advertised
1127          * by another process that handled the initial request.
1128          */
1129         if (has_non_tip)
1130                 check_non_tip(data);
1131
1132         if (!data->use_sideband && data->daemon_mode)
1133                 data->no_progress = 1;
1134
1135         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1136                 return;
1137
1138         if (send_shallow_list(data))
1139                 packet_flush(1);
1140 }
1141
1142 /* return non-zero if the ref is hidden, otherwise 0 */
1143 static int mark_our_ref(const char *refname, const char *refname_full,
1144                         const struct object_id *oid)
1145 {
1146         struct object *o = lookup_unknown_object(oid);
1147
1148         if (ref_is_hidden(refname, refname_full)) {
1149                 o->flags |= HIDDEN_REF;
1150                 return 1;
1151         }
1152         o->flags |= OUR_REF;
1153         return 0;
1154 }
1155
1156 static int check_ref(const char *refname_full, const struct object_id *oid,
1157                      int flag, void *cb_data)
1158 {
1159         const char *refname = strip_namespace(refname_full);
1160
1161         mark_our_ref(refname, refname_full, oid);
1162         return 0;
1163 }
1164
1165 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1166 {
1167         struct string_list_item *item;
1168
1169         if (!symref->nr)
1170                 return;
1171         for_each_string_list_item(item, symref)
1172                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1173 }
1174
1175 static int send_ref(const char *refname, const struct object_id *oid,
1176                     int flag, void *cb_data)
1177 {
1178         static const char *capabilities = "multi_ack thin-pack side-band"
1179                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1180                 " deepen-relative no-progress include-tag multi_ack_detailed";
1181         const char *refname_nons = strip_namespace(refname);
1182         struct object_id peeled;
1183         struct upload_pack_data *data = cb_data;
1184
1185         if (mark_our_ref(refname_nons, refname, oid))
1186                 return 0;
1187
1188         if (capabilities) {
1189                 struct strbuf symref_info = STRBUF_INIT;
1190
1191                 format_symref_info(&symref_info, &data->symref);
1192                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1193                              oid_to_hex(oid), refname_nons,
1194                              0, capabilities,
1195                              (data->allow_uor & ALLOW_TIP_SHA1) ?
1196                                      " allow-tip-sha1-in-want" : "",
1197                              (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1198                                      " allow-reachable-sha1-in-want" : "",
1199                              data->stateless_rpc ? " no-done" : "",
1200                              symref_info.buf,
1201                              data->allow_filter ? " filter" : "",
1202                              git_user_agent_sanitized());
1203                 strbuf_release(&symref_info);
1204         } else {
1205                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1206         }
1207         capabilities = NULL;
1208         if (!peel_ref(refname, &peeled))
1209                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1210         return 0;
1211 }
1212
1213 static int find_symref(const char *refname, const struct object_id *oid,
1214                        int flag, void *cb_data)
1215 {
1216         const char *symref_target;
1217         struct string_list_item *item;
1218
1219         if ((flag & REF_ISSYMREF) == 0)
1220                 return 0;
1221         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1222         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1223                 die("'%s' is a symref but it is not?", refname);
1224         item = string_list_append(cb_data, strip_namespace(refname));
1225         item->util = xstrdup(strip_namespace(symref_target));
1226         return 0;
1227 }
1228
1229 static int parse_object_filter_config(const char *var, const char *value,
1230                                        struct upload_pack_data *data)
1231 {
1232         struct strbuf buf = STRBUF_INIT;
1233         const char *sub, *key;
1234         size_t sub_len;
1235
1236         if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1237                 return 0;
1238
1239         if (!sub) {
1240                 if (!strcmp(key, "allow"))
1241                         data->allow_filter_fallback = git_config_bool(var, value);
1242                 return 0;
1243         }
1244
1245         strbuf_add(&buf, sub, sub_len);
1246
1247         if (!strcmp(key, "allow"))
1248                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1249                         (void *)(intptr_t)git_config_bool(var, value);
1250
1251         strbuf_release(&buf);
1252         return 0;
1253 }
1254
1255 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1256 {
1257         struct upload_pack_data *data = cb_data;
1258
1259         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1260                 if (git_config_bool(var, value))
1261                         data->allow_uor |= ALLOW_TIP_SHA1;
1262                 else
1263                         data->allow_uor &= ~ALLOW_TIP_SHA1;
1264         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1265                 if (git_config_bool(var, value))
1266                         data->allow_uor |= ALLOW_REACHABLE_SHA1;
1267                 else
1268                         data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1269         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1270                 if (git_config_bool(var, value))
1271                         data->allow_uor |= ALLOW_ANY_SHA1;
1272                 else
1273                         data->allow_uor &= ~ALLOW_ANY_SHA1;
1274         } else if (!strcmp("uploadpack.keepalive", var)) {
1275                 data->keepalive = git_config_int(var, value);
1276                 if (!data->keepalive)
1277                         data->keepalive = -1;
1278         } else if (!strcmp("uploadpack.allowfilter", var)) {
1279                 data->allow_filter = git_config_bool(var, value);
1280         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1281                 data->allow_ref_in_want = git_config_bool(var, value);
1282         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1283                 data->allow_sideband_all = git_config_bool(var, value);
1284         } else if (!strcmp("core.precomposeunicode", var)) {
1285                 precomposed_unicode = git_config_bool(var, value);
1286         }
1287
1288         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1289         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1290                 if (!strcmp("uploadpack.packobjectshook", var))
1291                         return git_config_string(&data->pack_objects_hook, var, value);
1292         }
1293
1294         parse_object_filter_config(var, value, data);
1295
1296         return parse_hide_refs_config(var, value, "uploadpack");
1297 }
1298
1299 void upload_pack(struct upload_pack_options *options)
1300 {
1301         struct packet_reader reader;
1302         struct upload_pack_data data;
1303
1304         upload_pack_data_init(&data);
1305
1306         git_config(upload_pack_config, &data);
1307
1308         data.stateless_rpc = options->stateless_rpc;
1309         data.daemon_mode = options->daemon_mode;
1310         data.timeout = options->timeout;
1311
1312         head_ref_namespaced(find_symref, &data.symref);
1313
1314         if (options->advertise_refs || !data.stateless_rpc) {
1315                 reset_timeout(data.timeout);
1316                 head_ref_namespaced(send_ref, &data);
1317                 for_each_namespaced_ref(send_ref, &data);
1318                 advertise_shallow_grafts(1);
1319                 packet_flush(1);
1320         } else {
1321                 head_ref_namespaced(check_ref, NULL);
1322                 for_each_namespaced_ref(check_ref, NULL);
1323         }
1324
1325         if (!options->advertise_refs) {
1326                 packet_reader_init(&reader, 0, NULL, 0,
1327                                    PACKET_READ_CHOMP_NEWLINE |
1328                                    PACKET_READ_DIE_ON_ERR_PACKET);
1329
1330                 receive_needs(&data, &reader);
1331                 if (data.want_obj.nr) {
1332                         get_common_commits(&data, &reader);
1333                         create_pack_file(&data, NULL);
1334                 }
1335         }
1336
1337         upload_pack_data_clear(&data);
1338 }
1339
1340 static int parse_want(struct packet_writer *writer, const char *line,
1341                       struct object_array *want_obj)
1342 {
1343         const char *arg;
1344         if (skip_prefix(line, "want ", &arg)) {
1345                 struct object_id oid;
1346                 struct object *o;
1347
1348                 if (get_oid_hex(arg, &oid))
1349                         die("git upload-pack: protocol error, "
1350                             "expected to get oid, not '%s'", line);
1351
1352                 o = parse_object(the_repository, &oid);
1353                 if (!o) {
1354                         packet_writer_error(writer,
1355                                             "upload-pack: not our ref %s",
1356                                             oid_to_hex(&oid));
1357                         die("git upload-pack: not our ref %s",
1358                             oid_to_hex(&oid));
1359                 }
1360
1361                 if (!(o->flags & WANTED)) {
1362                         o->flags |= WANTED;
1363                         add_object_array(o, NULL, want_obj);
1364                 }
1365
1366                 return 1;
1367         }
1368
1369         return 0;
1370 }
1371
1372 static int parse_want_ref(struct packet_writer *writer, const char *line,
1373                           struct string_list *wanted_refs,
1374                           struct object_array *want_obj)
1375 {
1376         const char *arg;
1377         if (skip_prefix(line, "want-ref ", &arg)) {
1378                 struct object_id oid;
1379                 struct string_list_item *item;
1380                 struct object *o;
1381
1382                 if (read_ref(arg, &oid)) {
1383                         packet_writer_error(writer, "unknown ref %s", arg);
1384                         die("unknown ref %s", arg);
1385                 }
1386
1387                 item = string_list_append(wanted_refs, arg);
1388                 item->util = oiddup(&oid);
1389
1390                 o = parse_object_or_die(&oid, arg);
1391                 if (!(o->flags & WANTED)) {
1392                         o->flags |= WANTED;
1393                         add_object_array(o, NULL, want_obj);
1394                 }
1395
1396                 return 1;
1397         }
1398
1399         return 0;
1400 }
1401
1402 static int parse_have(const char *line, struct oid_array *haves)
1403 {
1404         const char *arg;
1405         if (skip_prefix(line, "have ", &arg)) {
1406                 struct object_id oid;
1407
1408                 if (get_oid_hex(arg, &oid))
1409                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1410                 oid_array_append(haves, &oid);
1411                 return 1;
1412         }
1413
1414         return 0;
1415 }
1416
1417 static void process_args(struct packet_reader *request,
1418                          struct upload_pack_data *data)
1419 {
1420         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1421                 const char *arg = request->line;
1422                 const char *p;
1423
1424                 /* process want */
1425                 if (parse_want(&data->writer, arg, &data->want_obj))
1426                         continue;
1427                 if (data->allow_ref_in_want &&
1428                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1429                                    &data->want_obj))
1430                         continue;
1431                 /* process have line */
1432                 if (parse_have(arg, &data->haves))
1433                         continue;
1434
1435                 /* process args like thin-pack */
1436                 if (!strcmp(arg, "thin-pack")) {
1437                         data->use_thin_pack = 1;
1438                         continue;
1439                 }
1440                 if (!strcmp(arg, "ofs-delta")) {
1441                         data->use_ofs_delta = 1;
1442                         continue;
1443                 }
1444                 if (!strcmp(arg, "no-progress")) {
1445                         data->no_progress = 1;
1446                         continue;
1447                 }
1448                 if (!strcmp(arg, "include-tag")) {
1449                         data->use_include_tag = 1;
1450                         continue;
1451                 }
1452                 if (!strcmp(arg, "done")) {
1453                         data->done = 1;
1454                         continue;
1455                 }
1456
1457                 /* Shallow related arguments */
1458                 if (process_shallow(arg, &data->shallows))
1459                         continue;
1460                 if (process_deepen(arg, &data->depth))
1461                         continue;
1462                 if (process_deepen_since(arg, &data->deepen_since,
1463                                          &data->deepen_rev_list))
1464                         continue;
1465                 if (process_deepen_not(arg, &data->deepen_not,
1466                                        &data->deepen_rev_list))
1467                         continue;
1468                 if (!strcmp(arg, "deepen-relative")) {
1469                         data->deepen_relative = 1;
1470                         continue;
1471                 }
1472
1473                 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1474                         list_objects_filter_die_if_populated(&data->filter_options);
1475                         parse_list_objects_filter(&data->filter_options, p);
1476                         die_if_using_banned_filter(data);
1477                         continue;
1478                 }
1479
1480                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1481                      data->allow_sideband_all) &&
1482                     !strcmp(arg, "sideband-all")) {
1483                         data->writer.use_sideband = 1;
1484                         continue;
1485                 }
1486
1487                 if (skip_prefix(arg, "packfile-uris ", &p)) {
1488                         string_list_split(&data->uri_protocols, p, ',', -1);
1489                         continue;
1490                 }
1491
1492                 /* ignore unknown lines maybe? */
1493                 die("unexpected line: '%s'", arg);
1494         }
1495
1496         if (data->uri_protocols.nr && !data->writer.use_sideband)
1497                 string_list_clear(&data->uri_protocols, 0);
1498
1499         if (request->status != PACKET_READ_FLUSH)
1500                 die(_("expected flush after fetch arguments"));
1501 }
1502
1503 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1504 {
1505         int i;
1506
1507         /* Process haves */
1508         for (i = 0; i < data->haves.nr; i++) {
1509                 const struct object_id *oid = &data->haves.oid[i];
1510
1511                 if (!has_object_file(oid))
1512                         continue;
1513
1514                 oid_array_append(common, oid);
1515
1516                 do_got_oid(data, oid);
1517         }
1518
1519         return 0;
1520 }
1521
1522 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1523 {
1524         int i;
1525
1526         packet_writer_write(&data->writer, "acknowledgments\n");
1527
1528         /* Send Acks */
1529         if (!acks->nr)
1530                 packet_writer_write(&data->writer, "NAK\n");
1531
1532         for (i = 0; i < acks->nr; i++) {
1533                 packet_writer_write(&data->writer, "ACK %s\n",
1534                                     oid_to_hex(&acks->oid[i]));
1535         }
1536
1537         if (ok_to_give_up(data)) {
1538                 /* Send Ready */
1539                 packet_writer_write(&data->writer, "ready\n");
1540                 return 1;
1541         }
1542
1543         return 0;
1544 }
1545
1546 static int process_haves_and_send_acks(struct upload_pack_data *data)
1547 {
1548         struct oid_array common = OID_ARRAY_INIT;
1549         int ret = 0;
1550
1551         process_haves(data, &common);
1552         if (data->done) {
1553                 ret = 1;
1554         } else if (send_acks(data, &common)) {
1555                 packet_writer_delim(&data->writer);
1556                 ret = 1;
1557         } else {
1558                 /* Add Flush */
1559                 packet_writer_flush(&data->writer);
1560                 ret = 0;
1561         }
1562
1563         oid_array_clear(&data->haves);
1564         oid_array_clear(&common);
1565         return ret;
1566 }
1567
1568 static void send_wanted_ref_info(struct upload_pack_data *data)
1569 {
1570         const struct string_list_item *item;
1571
1572         if (!data->wanted_refs.nr)
1573                 return;
1574
1575         packet_writer_write(&data->writer, "wanted-refs\n");
1576
1577         for_each_string_list_item(item, &data->wanted_refs) {
1578                 packet_writer_write(&data->writer, "%s %s\n",
1579                                     oid_to_hex(item->util),
1580                                     item->string);
1581         }
1582
1583         packet_writer_delim(&data->writer);
1584 }
1585
1586 static void send_shallow_info(struct upload_pack_data *data)
1587 {
1588         /* No shallow info needs to be sent */
1589         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1590             !is_repository_shallow(the_repository))
1591                 return;
1592
1593         packet_writer_write(&data->writer, "shallow-info\n");
1594
1595         if (!send_shallow_list(data) &&
1596             is_repository_shallow(the_repository))
1597                 deepen(data, INFINITE_DEPTH);
1598
1599         packet_delim(1);
1600 }
1601
1602 enum fetch_state {
1603         FETCH_PROCESS_ARGS = 0,
1604         FETCH_SEND_ACKS,
1605         FETCH_SEND_PACK,
1606         FETCH_DONE,
1607 };
1608
1609 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1610                    struct packet_reader *request)
1611 {
1612         enum fetch_state state = FETCH_PROCESS_ARGS;
1613         struct upload_pack_data data;
1614
1615         clear_object_flags(ALL_FLAGS);
1616
1617         upload_pack_data_init(&data);
1618         data.use_sideband = LARGE_PACKET_MAX;
1619
1620         git_config(upload_pack_config, &data);
1621
1622         while (state != FETCH_DONE) {
1623                 switch (state) {
1624                 case FETCH_PROCESS_ARGS:
1625                         process_args(request, &data);
1626
1627                         if (!data.want_obj.nr) {
1628                                 /*
1629                                  * Request didn't contain any 'want' lines,
1630                                  * guess they didn't want anything.
1631                                  */
1632                                 state = FETCH_DONE;
1633                         } else if (data.haves.nr) {
1634                                 /*
1635                                  * Request had 'have' lines, so lets ACK them.
1636                                  */
1637                                 state = FETCH_SEND_ACKS;
1638                         } else {
1639                                 /*
1640                                  * Request had 'want's but no 'have's so we can
1641                                  * immedietly go to construct and send a pack.
1642                                  */
1643                                 state = FETCH_SEND_PACK;
1644                         }
1645                         break;
1646                 case FETCH_SEND_ACKS:
1647                         if (process_haves_and_send_acks(&data))
1648                                 state = FETCH_SEND_PACK;
1649                         else
1650                                 state = FETCH_DONE;
1651                         break;
1652                 case FETCH_SEND_PACK:
1653                         send_wanted_ref_info(&data);
1654                         send_shallow_info(&data);
1655
1656                         if (data.uri_protocols.nr) {
1657                                 create_pack_file(&data, &data.uri_protocols);
1658                         } else {
1659                                 packet_writer_write(&data.writer, "packfile\n");
1660                                 create_pack_file(&data, NULL);
1661                         }
1662                         state = FETCH_DONE;
1663                         break;
1664                 case FETCH_DONE:
1665                         continue;
1666                 }
1667         }
1668
1669         upload_pack_data_clear(&data);
1670         return 0;
1671 }
1672
1673 int upload_pack_advertise(struct repository *r,
1674                           struct strbuf *value)
1675 {
1676         if (value) {
1677                 int allow_filter_value;
1678                 int allow_ref_in_want;
1679                 int allow_sideband_all_value;
1680                 char *str = NULL;
1681
1682                 strbuf_addstr(value, "shallow");
1683
1684                 if (!repo_config_get_bool(the_repository,
1685                                          "uploadpack.allowfilter",
1686                                          &allow_filter_value) &&
1687                     allow_filter_value)
1688                         strbuf_addstr(value, " filter");
1689
1690                 if (!repo_config_get_bool(the_repository,
1691                                          "uploadpack.allowrefinwant",
1692                                          &allow_ref_in_want) &&
1693                     allow_ref_in_want)
1694                         strbuf_addstr(value, " ref-in-want");
1695
1696                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1697                     (!repo_config_get_bool(the_repository,
1698                                            "uploadpack.allowsidebandall",
1699                                            &allow_sideband_all_value) &&
1700                      allow_sideband_all_value))
1701                         strbuf_addstr(value, " sideband-all");
1702
1703                 if (!repo_config_get_string(the_repository,
1704                                             "uploadpack.blobpackfileuri",
1705                                             &str) &&
1706                     str) {
1707                         strbuf_addstr(value, " packfile-uris");
1708                         free(str);
1709                 }
1710         }
1711
1712         return 1;
1713 }