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         unsigned advertise_sid : 1;
 114 };
 115
 116 static void upload_pack_data_init(struct upload_pack_data *data)
 117 {
 118         struct string_list symref = STRING_LIST_INIT_DUP;
 119         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 120         struct object_array want_obj = OBJECT_ARRAY_INIT;
 121         struct object_array have_obj = OBJECT_ARRAY_INIT;
 122         struct oid_array haves = OID_ARRAY_INIT;
 123         struct object_array shallows = OBJECT_ARRAY_INIT;
 124         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 125         struct string_list uri_protocols = STRING_LIST_INIT_DUP;
 126         struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
 127         struct string_list allowed_filters = STRING_LIST_INIT_DUP;
 128
 129         memset(data, 0, sizeof(*data));
 130         data->symref = symref;
 131         data->wanted_refs = wanted_refs;
 132         data->want_obj = want_obj;
 133         data->have_obj = have_obj;
 134         data->haves = haves;
 135         data->shallows = shallows;
 136         data->deepen_not = deepen_not;
 137         data->uri_protocols = uri_protocols;
 138         data->extra_edge_obj = extra_edge_obj;
 139         data->allowed_filters = allowed_filters;
 140         data->allow_filter_fallback = 1;
 141         data->tree_filter_max_depth = ULONG_MAX;
 142         packet_writer_init(&data->writer, 1);
 143
 144         data->keepalive = 5;
 145         data->advertise_sid = 0;
 146 }
 147
 148 static void upload_pack_data_clear(struct upload_pack_data *data)
 149 {
 150         string_list_clear(&data->symref, 1);
 151         string_list_clear(&data->wanted_refs, 1);
 152         object_array_clear(&data->want_obj);
 153         object_array_clear(&data->have_obj);
 154         oid_array_clear(&data->haves);
 155         object_array_clear(&data->shallows);
 156         string_list_clear(&data->deepen_not, 0);
 157         object_array_clear(&data->extra_edge_obj);
 158         list_objects_filter_release(&data->filter_options);
 159         string_list_clear(&data->allowed_filters, 0);
 160
 161         free((char *)data->pack_objects_hook);
 162 }
 163
 164 static void reset_timeout(unsigned int timeout)
 165 {
 166         alarm(timeout);
 167 }
 168
 169 static void send_client_data(int fd, const char *data, ssize_t sz,
 170                              int use_sideband)
 171 {
 172         if (use_sideband) {
 173                 send_sideband(1, fd, data, sz, use_sideband);
 174                 return;
 175         }
 176         if (fd == 3)
 177                 /* emergency quit */
 178                 fd = 2;
 179         if (fd == 2) {
 180                 /* XXX: are we happy to lose stuff here? */
 181                 xwrite(fd, data, sz);
 182                 return;
 183         }
 184         write_or_die(fd, data, sz);
 185 }
 186
 187 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 188 {
 189         FILE *fp = cb_data;
 190         if (graft->nr_parent == -1)
 191                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 192         return 0;
 193 }
 194
 195 struct output_state {
 196         char buffer[8193];
 197         int used;
 198         unsigned packfile_uris_started : 1;
 199         unsigned packfile_started : 1;
 200 };
 201
 202 static int relay_pack_data(int pack_objects_out, struct output_state *os,
 203                            int use_sideband, int write_packfile_line)
 204 {
 205         /*
 206          * We keep the last byte to ourselves
 207          * in case we detect broken rev-list, so that we
 208          * can leave the stream corrupted.  This is
 209          * unfortunate -- unpack-objects would happily
 210          * accept a valid packdata with trailing garbage,
 211          * so appending garbage after we pass all the
 212          * pack data is not good enough to signal
 213          * breakage to downstream.
 214          */
 215         ssize_t readsz;
 216
 217         readsz = xread(pack_objects_out, os->buffer + os->used,
 218                        sizeof(os->buffer) - os->used);
 219         if (readsz < 0) {
 220                 return readsz;
 221         }
 222         os->used += readsz;
 223
 224         while (!os->packfile_started) {
 225                 char *p;
 226                 if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
 227                         os->packfile_started = 1;
 228                         if (write_packfile_line) {
 229                                 if (os->packfile_uris_started)
 230                                         packet_delim(1);
 231                                 packet_write_fmt(1, "\1packfile\n");
 232                         }
 233                         break;
 234                 }
 235                 if ((p = memchr(os->buffer, '\n', os->used))) {
 236                         if (!os->packfile_uris_started) {
 237                                 os->packfile_uris_started = 1;
 238                                 if (!write_packfile_line)
 239                                         BUG("packfile_uris requires sideband-all");
 240                                 packet_write_fmt(1, "\1packfile-uris\n");
 241                         }
 242                         *p = '\0';
 243                         packet_write_fmt(1, "\1%s\n", os->buffer);
 244
 245                         os->used -= p - os->buffer + 1;
 246                         memmove(os->buffer, p + 1, os->used);
 247                 } else {
 248                         /*
 249                          * Incomplete line.
 250                          */
 251                         return readsz;
 252                 }
 253         }
 254
 255         if (os->used > 1) {
 256                 send_client_data(1, os->buffer, os->used - 1, use_sideband);
 257                 os->buffer[0] = os->buffer[os->used - 1];
 258                 os->used = 1;
 259         } else {
 260                 send_client_data(1, os->buffer, os->used, use_sideband);
 261                 os->used = 0;
 262         }
 263
 264         return readsz;
 265 }
 266
 267 static void create_pack_file(struct upload_pack_data *pack_data,
 268                              const struct string_list *uri_protocols)
 269 {
 270         struct child_process pack_objects = CHILD_PROCESS_INIT;
 271         struct output_state output_state = { { 0 } };
 272         char progress[128];
 273         char abort_msg[] = "aborting due to possible repository "
 274                 "corruption on the remote side.";
 275         ssize_t sz;
 276         int i;
 277         FILE *pipe_fd;
 278
 279         if (!pack_data->pack_objects_hook)
 280                 pack_objects.git_cmd = 1;
 281         else {
 282                 strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
 283                 strvec_push(&pack_objects.args, "git");
 284                 pack_objects.use_shell = 1;
 285         }
 286
 287         if (pack_data->shallow_nr) {
 288                 strvec_push(&pack_objects.args, "--shallow-file");
 289                 strvec_push(&pack_objects.args, "");
 290         }
 291         strvec_push(&pack_objects.args, "pack-objects");
 292         strvec_push(&pack_objects.args, "--revs");
 293         if (pack_data->use_thin_pack)
 294                 strvec_push(&pack_objects.args, "--thin");
 295
 296         strvec_push(&pack_objects.args, "--stdout");
 297         if (pack_data->shallow_nr)
 298                 strvec_push(&pack_objects.args, "--shallow");
 299         if (!pack_data->no_progress)
 300                 strvec_push(&pack_objects.args, "--progress");
 301         if (pack_data->use_ofs_delta)
 302                 strvec_push(&pack_objects.args, "--delta-base-offset");
 303         if (pack_data->use_include_tag)
 304                 strvec_push(&pack_objects.args, "--include-tag");
 305         if (pack_data->filter_options.choice) {
 306                 const char *spec =
 307                         expand_list_objects_filter_spec(&pack_data->filter_options);
 308                 strvec_pushf(&pack_objects.args, "--filter=%s", spec);
 309         }
 310         if (uri_protocols) {
 311                 for (i = 0; i < uri_protocols->nr; i++)
 312                         strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
 313                                          uri_protocols->items[i].string);
 314         }
 315
 316         pack_objects.in = -1;
 317         pack_objects.out = -1;
 318         pack_objects.err = -1;
 319         pack_objects.clean_on_exit = 1;
 320
 321         if (start_command(&pack_objects))
 322                 die("git upload-pack: unable to fork git-pack-objects");
 323
 324         pipe_fd = xfdopen(pack_objects.in, "w");
 325
 326         if (pack_data->shallow_nr)
 327                 for_each_commit_graft(write_one_shallow, pipe_fd);
 328
 329         for (i = 0; i < pack_data->want_obj.nr; i++)
 330                 fprintf(pipe_fd, "%s\n",
 331                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 332         fprintf(pipe_fd, "--not\n");
 333         for (i = 0; i < pack_data->have_obj.nr; i++)
 334                 fprintf(pipe_fd, "%s\n",
 335                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 336         for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
 337                 fprintf(pipe_fd, "%s\n",
 338                         oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
 339         fprintf(pipe_fd, "\n");
 340         fflush(pipe_fd);
 341         fclose(pipe_fd);
 342
 343         /* We read from pack_objects.err to capture stderr output for
 344          * progress bar, and pack_objects.out to capture the pack data.
 345          */
 346
 347         while (1) {
 348                 struct pollfd pfd[2];
 349                 int pe, pu, pollsize, polltimeout;
 350                 int ret;
 351
 352                 reset_timeout(pack_data->timeout);
 353
 354                 pollsize = 0;
 355                 pe = pu = -1;
 356
 357                 if (0 <= pack_objects.out) {
 358                         pfd[pollsize].fd = pack_objects.out;
 359                         pfd[pollsize].events = POLLIN;
 360                         pu = pollsize;
 361                         pollsize++;
 362                 }
 363                 if (0 <= pack_objects.err) {
 364                         pfd[pollsize].fd = pack_objects.err;
 365                         pfd[pollsize].events = POLLIN;
 366                         pe = pollsize;
 367                         pollsize++;
 368                 }
 369
 370                 if (!pollsize)
 371                         break;
 372
 373                 polltimeout = pack_data->keepalive < 0
 374                         ? -1
 375                         : 1000 * pack_data->keepalive;
 376
 377                 ret = poll(pfd, pollsize, polltimeout);
 378
 379                 if (ret < 0) {
 380                         if (errno != EINTR) {
 381                                 error_errno("poll failed, resuming");
 382                                 sleep(1);
 383                         }
 384                         continue;
 385                 }
 386                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 387                         /* Status ready; we ship that in the side-band
 388                          * or dump to the standard error.
 389                          */
 390                         sz = xread(pack_objects.err, progress,
 391                                   sizeof(progress));
 392                         if (0 < sz)
 393                                 send_client_data(2, progress, sz,
 394                                                  pack_data->use_sideband);
 395                         else if (sz == 0) {
 396                                 close(pack_objects.err);
 397                                 pack_objects.err = -1;
 398                         }
 399                         else
 400                                 goto fail;
 401                         /* give priority to status messages */
 402                         continue;
 403                 }
 404                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 405                         int result = relay_pack_data(pack_objects.out,
 406                                                      &output_state,
 407                                                      pack_data->use_sideband,
 408                                                      !!uri_protocols);
 409
 410                         if (result == 0) {
 411                                 close(pack_objects.out);
 412                                 pack_objects.out = -1;
 413                         } else if (result < 0) {
 414                                 goto fail;
 415                         }
 416                 }
 417
 418                 /*
 419                  * We hit the keepalive timeout without saying anything; send
 420                  * an empty message on the data sideband just to let the other
 421                  * side know we're still working on it, but don't have any data
 422                  * yet.
 423                  *
 424                  * If we don't have a sideband channel, there's no room in the
 425                  * protocol to say anything, so those clients are just out of
 426                  * luck.
 427                  */
 428                 if (!ret && pack_data->use_sideband) {
 429                         static const char buf[] = "0005\1";
 430                         write_or_die(1, buf, 5);
 431                 }
 432         }
 433
 434         if (finish_command(&pack_objects)) {
 435                 error("git upload-pack: git-pack-objects died with error.");
 436                 goto fail;
 437         }
 438
 439         /* flush the data */
 440         if (output_state.used > 0) {
 441                 send_client_data(1, output_state.buffer, output_state.used,
 442                                  pack_data->use_sideband);
 443                 fprintf(stderr, "flushed.\n");
 444         }
 445         if (pack_data->use_sideband)
 446                 packet_flush(1);
 447         return;
 448
 449  fail:
 450         send_client_data(3, abort_msg, sizeof(abort_msg),
 451                          pack_data->use_sideband);
 452         die("git upload-pack: %s", abort_msg);
 453 }
 454
 455 static int do_got_oid(struct upload_pack_data *data, const struct object_id *oid)
 456 {
 457         int we_knew_they_have = 0;
 458         struct object *o = parse_object(the_repository, oid);
 459
 460         if (!o)
 461                 die("oops (%s)", oid_to_hex(oid));
 462         if (o->type == OBJ_COMMIT) {
 463                 struct commit_list *parents;
 464                 struct commit *commit = (struct commit *)o;
 465                 if (o->flags & THEY_HAVE)
 466                         we_knew_they_have = 1;
 467                 else
 468                         o->flags |= THEY_HAVE;
 469                 if (!data->oldest_have || (commit->date < data->oldest_have))
 470                         data->oldest_have = commit->date;
 471                 for (parents = commit->parents;
 472                      parents;
 473                      parents = parents->next)
 474                         parents->item->object.flags |= THEY_HAVE;
 475         }
 476         if (!we_knew_they_have) {
 477                 add_object_array(o, NULL, &data->have_obj);
 478                 return 1;
 479         }
 480         return 0;
 481 }
 482
 483 static int got_oid(struct upload_pack_data *data,
 484                    const char *hex, struct object_id *oid)
 485 {
 486         if (get_oid_hex(hex, oid))
 487                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 488         if (!has_object_file_with_flags(oid,
 489                                         OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
 490                 return -1;
 491         return do_got_oid(data, oid);
 492 }
 493
 494 static int ok_to_give_up(struct upload_pack_data *data)
 495 {
 496         timestamp_t min_generation = GENERATION_NUMBER_ZERO;
 497
 498         if (!data->have_obj.nr)
 499                 return 0;
 500
 501         return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
 502                                             COMMON_KNOWN, data->oldest_have,
 503                                             min_generation);
 504 }
 505
 506 static int get_common_commits(struct upload_pack_data *data,
 507                               struct packet_reader *reader)
 508 {
 509         struct object_id oid;
 510         char last_hex[GIT_MAX_HEXSZ + 1];
 511         int got_common = 0;
 512         int got_other = 0;
 513         int sent_ready = 0;
 514
 515         save_commit_buffer = 0;
 516
 517         for (;;) {
 518                 const char *arg;
 519
 520                 reset_timeout(data->timeout);
 521
 522                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 523                         if (data->multi_ack == MULTI_ACK_DETAILED
 524                             && got_common
 525                             && !got_other
 526                             && ok_to_give_up(data)) {
 527                                 sent_ready = 1;
 528                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 529                         }
 530                         if (data->have_obj.nr == 0 || data->multi_ack)
 531                                 packet_write_fmt(1, "NAK\n");
 532
 533                         if (data->no_done && sent_ready) {
 534                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 535                                 return 0;
 536                         }
 537                         if (data->stateless_rpc)
 538                                 exit(0);
 539                         got_common = 0;
 540                         got_other = 0;
 541                         continue;
 542                 }
 543                 if (skip_prefix(reader->line, "have ", &arg)) {
 544                         switch (got_oid(data, arg, &oid)) {
 545                         case -1: /* they have what we do not */
 546                                 got_other = 1;
 547                                 if (data->multi_ack
 548                                     && ok_to_give_up(data)) {
 549                                         const char *hex = oid_to_hex(&oid);
 550                                         if (data->multi_ack == MULTI_ACK_DETAILED) {
 551                                                 sent_ready = 1;
 552                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 553                                         } else
 554                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 555                                 }
 556                                 break;
 557                         default:
 558                                 got_common = 1;
 559                                 oid_to_hex_r(last_hex, &oid);
 560                                 if (data->multi_ack == MULTI_ACK_DETAILED)
 561                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 562                                 else if (data->multi_ack)
 563                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 564                                 else if (data->have_obj.nr == 1)
 565                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 566                                 break;
 567                         }
 568                         continue;
 569                 }
 570                 if (!strcmp(reader->line, "done")) {
 571                         if (data->have_obj.nr > 0) {
 572                                 if (data->multi_ack)
 573                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 574                                 return 0;
 575                         }
 576                         packet_write_fmt(1, "NAK\n");
 577                         return -1;
 578                 }
 579                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 580         }
 581 }
 582
 583 static int is_our_ref(struct object *o, enum allow_uor allow_uor)
 584 {
 585         int allow_hidden_ref = (allow_uor &
 586                                 (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 587         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 588 }
 589
 590 /*
 591  * on successful case, it's up to the caller to close cmd->out
 592  */
 593 static int do_reachable_revlist(struct child_process *cmd,
 594                                 struct object_array *src,
 595                                 struct object_array *reachable,
 596                                 enum allow_uor allow_uor)
 597 {
 598         static const char *argv[] = {
 599                 "rev-list", "--stdin", NULL,
 600         };
 601         struct object *o;
 602         FILE *cmd_in = NULL;
 603         int i;
 604
 605         cmd->argv = argv;
 606         cmd->git_cmd = 1;
 607         cmd->no_stderr = 1;
 608         cmd->in = -1;
 609         cmd->out = -1;
 610
 611         /*
 612          * If the next rev-list --stdin encounters an unknown commit,
 613          * it terminates, which will cause SIGPIPE in the write loop
 614          * below.
 615          */
 616         sigchain_push(SIGPIPE, SIG_IGN);
 617
 618         if (start_command(cmd))
 619                 goto error;
 620
 621         cmd_in = xfdopen(cmd->in, "w");
 622
 623         for (i = get_max_object_index(); 0 < i; ) {
 624                 o = get_indexed_object(--i);
 625                 if (!o)
 626                         continue;
 627                 if (reachable && o->type == OBJ_COMMIT)
 628                         o->flags &= ~TMP_MARK;
 629                 if (!is_our_ref(o, allow_uor))
 630                         continue;
 631                 if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
 632                         goto error;
 633         }
 634         for (i = 0; i < src->nr; i++) {
 635                 o = src->objects[i].item;
 636                 if (is_our_ref(o, allow_uor)) {
 637                         if (reachable)
 638                                 add_object_array(o, NULL, reachable);
 639                         continue;
 640                 }
 641                 if (reachable && o->type == OBJ_COMMIT)
 642                         o->flags |= TMP_MARK;
 643                 if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
 644                         goto error;
 645         }
 646         if (ferror(cmd_in) || fflush(cmd_in))
 647                 goto error;
 648         fclose(cmd_in);
 649         cmd->in = -1;
 650         sigchain_pop(SIGPIPE);
 651
 652         return 0;
 653
 654 error:
 655         sigchain_pop(SIGPIPE);
 656
 657         if (cmd_in)
 658                 fclose(cmd_in);
 659         if (cmd->out >= 0)
 660                 close(cmd->out);
 661         return -1;
 662 }
 663
 664 static int get_reachable_list(struct upload_pack_data *data,
 665                               struct object_array *reachable)
 666 {
 667         struct child_process cmd = CHILD_PROCESS_INIT;
 668         int i;
 669         struct object *o;
 670         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 671         const unsigned hexsz = the_hash_algo->hexsz;
 672
 673         if (do_reachable_revlist(&cmd, &data->shallows, reachable,
 674                                  data->allow_uor) < 0)
 675                 return -1;
 676
 677         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 678                 struct object_id oid;
 679                 const char *p;
 680
 681                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 682                         break;
 683
 684                 o = lookup_object(the_repository, &oid);
 685                 if (o && o->type == OBJ_COMMIT) {
 686                         o->flags &= ~TMP_MARK;
 687                 }
 688         }
 689         for (i = get_max_object_index(); 0 < i; i--) {
 690                 o = get_indexed_object(i - 1);
 691                 if (o && o->type == OBJ_COMMIT &&
 692                     (o->flags & TMP_MARK)) {
 693                         add_object_array(o, NULL, reachable);
 694                                 o->flags &= ~TMP_MARK;
 695                 }
 696         }
 697         close(cmd.out);
 698
 699         if (finish_command(&cmd))
 700                 return -1;
 701
 702         return 0;
 703 }
 704
 705 static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
 706 {
 707         struct child_process cmd = CHILD_PROCESS_INIT;
 708         char buf[1];
 709         int i;
 710
 711         if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
 712                 return 1;
 713
 714         /*
 715          * The commits out of the rev-list are not ancestors of
 716          * our ref.
 717          */
 718         i = read_in_full(cmd.out, buf, 1);
 719         if (i)
 720                 goto error;
 721         close(cmd.out);
 722         cmd.out = -1;
 723
 724         /*
 725          * rev-list may have died by encountering a bad commit
 726          * in the history, in which case we do want to bail out
 727          * even when it showed no commit.
 728          */
 729         if (finish_command(&cmd))
 730                 goto error;
 731
 732         /* All the non-tip ones are ancestors of what we advertised */
 733         return 0;
 734
 735 error:
 736         if (cmd.out >= 0)
 737                 close(cmd.out);
 738         return 1;
 739 }
 740
 741 static void check_non_tip(struct upload_pack_data *data)
 742 {
 743         int i;
 744
 745         /*
 746          * In the normal in-process case without
 747          * uploadpack.allowReachableSHA1InWant,
 748          * non-tip requests can never happen.
 749          */
 750         if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
 751                 goto error;
 752         if (!has_unreachable(&data->want_obj, data->allow_uor))
 753                 /* All the non-tip ones are ancestors of what we advertised */
 754                 return;
 755
 756 error:
 757         /* Pick one of them (we know there at least is one) */
 758         for (i = 0; i < data->want_obj.nr; i++) {
 759                 struct object *o = data->want_obj.objects[i].item;
 760                 if (!is_our_ref(o, data->allow_uor)) {
 761                         packet_writer_error(&data->writer,
 762                                             "upload-pack: not our ref %s",
 763                                             oid_to_hex(&o->oid));
 764                         die("git upload-pack: not our ref %s",
 765                             oid_to_hex(&o->oid));
 766                 }
 767         }
 768 }
 769
 770 static void send_shallow(struct upload_pack_data *data,
 771                          struct commit_list *result)
 772 {
 773         while (result) {
 774                 struct object *object = &result->item->object;
 775                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 776                         packet_writer_write(&data->writer, "shallow %s",
 777                                             oid_to_hex(&object->oid));
 778                         register_shallow(the_repository, &object->oid);
 779                         data->shallow_nr++;
 780                 }
 781                 result = result->next;
 782         }
 783 }
 784
 785 static void send_unshallow(struct upload_pack_data *data)
 786 {
 787         int i;
 788
 789         for (i = 0; i < data->shallows.nr; i++) {
 790                 struct object *object = data->shallows.objects[i].item;
 791                 if (object->flags & NOT_SHALLOW) {
 792                         struct commit_list *parents;
 793                         packet_writer_write(&data->writer, "unshallow %s",
 794                                             oid_to_hex(&object->oid));
 795                         object->flags &= ~CLIENT_SHALLOW;
 796                         /*
 797                          * We want to _register_ "object" as shallow, but we
 798                          * also need to traverse object's parents to deepen a
 799                          * shallow clone. Unregister it for now so we can
 800                          * parse and add the parents to the want list, then
 801                          * re-register it.
 802                          */
 803                         unregister_shallow(&object->oid);
 804                         object->parsed = 0;
 805                         parse_commit_or_die((struct commit *)object);
 806                         parents = ((struct commit *)object)->parents;
 807                         while (parents) {
 808                                 add_object_array(&parents->item->object,
 809                                                  NULL, &data->want_obj);
 810                                 parents = parents->next;
 811                         }
 812                         add_object_array(object, NULL, &data->extra_edge_obj);
 813                 }
 814                 /* make sure commit traversal conforms to client */
 815                 register_shallow(the_repository, &object->oid);
 816         }
 817 }
 818
 819 static int check_ref(const char *refname_full, const struct object_id *oid,
 820                      int flag, void *cb_data);
 821 static void deepen(struct upload_pack_data *data, int depth)
 822 {
 823         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 824                 int i;
 825
 826                 for (i = 0; i < data->shallows.nr; i++) {
 827                         struct object *object = data->shallows.objects[i].item;
 828                         object->flags |= NOT_SHALLOW;
 829                 }
 830         } else if (data->deepen_relative) {
 831                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 832                 struct commit_list *result;
 833
 834                 /*
 835                  * Checking for reachable shallows requires that our refs be
 836                  * marked with OUR_REF.
 837                  */
 838                 head_ref_namespaced(check_ref, NULL);
 839                 for_each_namespaced_ref(check_ref, NULL);
 840
 841                 get_reachable_list(data, &reachable_shallows);
 842                 result = get_shallow_commits(&reachable_shallows,
 843                                              depth + 1,
 844                                              SHALLOW, NOT_SHALLOW);
 845                 send_shallow(data, result);
 846                 free_commit_list(result);
 847                 object_array_clear(&reachable_shallows);
 848         } else {
 849                 struct commit_list *result;
 850
 851                 result = get_shallow_commits(&data->want_obj, depth,
 852                                              SHALLOW, NOT_SHALLOW);
 853                 send_shallow(data, result);
 854                 free_commit_list(result);
 855         }
 856
 857         send_unshallow(data);
 858 }
 859
 860 static void deepen_by_rev_list(struct upload_pack_data *data,
 861                                int ac,
 862                                const char **av)
 863 {
 864         struct commit_list *result;
 865
 866         disable_commit_graph(the_repository);
 867         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 868         send_shallow(data, result);
 869         free_commit_list(result);
 870         send_unshallow(data);
 871 }
 872
 873 /* Returns 1 if a shallow list is sent or 0 otherwise */
 874 static int send_shallow_list(struct upload_pack_data *data)
 875 {
 876         int ret = 0;
 877
 878         if (data->depth > 0 && data->deepen_rev_list)
 879                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 880         if (data->depth > 0) {
 881                 deepen(data, data->depth);
 882                 ret = 1;
 883         } else if (data->deepen_rev_list) {
 884                 struct strvec av = STRVEC_INIT;
 885                 int i;
 886
 887                 strvec_push(&av, "rev-list");
 888                 if (data->deepen_since)
 889                         strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
 890                 if (data->deepen_not.nr) {
 891                         strvec_push(&av, "--not");
 892                         for (i = 0; i < data->deepen_not.nr; i++) {
 893                                 struct string_list_item *s = data->deepen_not.items + i;
 894                                 strvec_push(&av, s->string);
 895                         }
 896                         strvec_push(&av, "--not");
 897                 }
 898                 for (i = 0; i < data->want_obj.nr; i++) {
 899                         struct object *o = data->want_obj.objects[i].item;
 900                         strvec_push(&av, oid_to_hex(&o->oid));
 901                 }
 902                 deepen_by_rev_list(data, av.nr, av.v);
 903                 strvec_clear(&av);
 904                 ret = 1;
 905         } else {
 906                 if (data->shallows.nr > 0) {
 907                         int i;
 908                         for (i = 0; i < data->shallows.nr; i++)
 909                                 register_shallow(the_repository,
 910                                                  &data->shallows.objects[i].item->oid);
 911                 }
 912         }
 913
 914         data->shallow_nr += data->shallows.nr;
 915         return ret;
 916 }
 917
 918 static int process_shallow(const char *line, struct object_array *shallows)
 919 {
 920         const char *arg;
 921         if (skip_prefix(line, "shallow ", &arg)) {
 922                 struct object_id oid;
 923                 struct object *object;
 924                 if (get_oid_hex(arg, &oid))
 925                         die("invalid shallow line: %s", line);
 926                 object = parse_object(the_repository, &oid);
 927                 if (!object)
 928                         return 1;
 929                 if (object->type != OBJ_COMMIT)
 930                         die("invalid shallow object %s", oid_to_hex(&oid));
 931                 if (!(object->flags & CLIENT_SHALLOW)) {
 932                         object->flags |= CLIENT_SHALLOW;
 933                         add_object_array(object, NULL, shallows);
 934                 }
 935                 return 1;
 936         }
 937
 938         return 0;
 939 }
 940
 941 static int process_deepen(const char *line, int *depth)
 942 {
 943         const char *arg;
 944         if (skip_prefix(line, "deepen ", &arg)) {
 945                 char *end = NULL;
 946                 *depth = (int)strtol(arg, &end, 0);
 947                 if (!end || *end || *depth <= 0)
 948                         die("Invalid deepen: %s", line);
 949                 return 1;
 950         }
 951
 952         return 0;
 953 }
 954
 955 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 956 {
 957         const char *arg;
 958         if (skip_prefix(line, "deepen-since ", &arg)) {
 959                 char *end = NULL;
 960                 *deepen_since = parse_timestamp(arg, &end, 0);
 961                 if (!end || *end || !deepen_since ||
 962                     /* revisions.c's max_age -1 is special */
 963                     *deepen_since == -1)
 964                         die("Invalid deepen-since: %s", line);
 965                 *deepen_rev_list = 1;
 966                 return 1;
 967         }
 968         return 0;
 969 }
 970
 971 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 972 {
 973         const char *arg;
 974         if (skip_prefix(line, "deepen-not ", &arg)) {
 975                 char *ref = NULL;
 976                 struct object_id oid;
 977                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 978                         die("git upload-pack: ambiguous deepen-not: %s", line);
 979                 string_list_append(deepen_not, ref);
 980                 free(ref);
 981                 *deepen_rev_list = 1;
 982                 return 1;
 983         }
 984         return 0;
 985 }
 986
 987 NORETURN __attribute__((format(printf,2,3)))
 988 static void send_err_and_die(struct upload_pack_data *data,
 989                              const char *fmt, ...)
 990 {
 991         struct strbuf buf = STRBUF_INIT;
 992         va_list ap;
 993
 994         va_start(ap, fmt);
 995         strbuf_vaddf(&buf, fmt, ap);
 996         va_end(ap);
 997
 998         packet_writer_error(&data->writer, "%s", buf.buf);
 999         die("%s", buf.buf);
1000 }
1001
1002 static void check_one_filter(struct upload_pack_data *data,
1003                              struct list_objects_filter_options *opts)
1004 {
1005         const char *key = list_object_filter_config_name(opts->choice);
1006         struct string_list_item *item = string_list_lookup(&data->allowed_filters,
1007                                                            key);
1008         int allowed;
1009
1010         if (item)
1011                 allowed = (intptr_t)item->util;
1012         else
1013                 allowed = data->allow_filter_fallback;
1014
1015         if (!allowed)
1016                 send_err_and_die(data, "filter '%s' not supported", key);
1017
1018         if (opts->choice == LOFC_TREE_DEPTH &&
1019             opts->tree_exclude_depth > data->tree_filter_max_depth)
1020                 send_err_and_die(data,
1021                                  "tree filter allows max depth %lu, but got %lu",
1022                                  data->tree_filter_max_depth,
1023                                  opts->tree_exclude_depth);
1024 }
1025
1026 static void check_filter_recurse(struct upload_pack_data *data,
1027                                  struct list_objects_filter_options *opts)
1028 {
1029         size_t i;
1030
1031         check_one_filter(data, opts);
1032         if (opts->choice != LOFC_COMBINE)
1033                 return;
1034
1035         for (i = 0; i < opts->sub_nr; i++)
1036                 check_filter_recurse(data, &opts->sub[i]);
1037 }
1038
1039 static void die_if_using_banned_filter(struct upload_pack_data *data)
1040 {
1041         check_filter_recurse(data, &data->filter_options);
1042 }
1043
1044 static void receive_needs(struct upload_pack_data *data,
1045                           struct packet_reader *reader)
1046 {
1047         int has_non_tip = 0;
1048
1049         data->shallow_nr = 0;
1050         for (;;) {
1051                 struct object *o;
1052                 const char *features;
1053                 struct object_id oid_buf;
1054                 const char *arg;
1055                 int feature_len;
1056
1057                 reset_timeout(data->timeout);
1058                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1059                         break;
1060
1061                 if (process_shallow(reader->line, &data->shallows))
1062                         continue;
1063                 if (process_deepen(reader->line, &data->depth))
1064                         continue;
1065                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
1066                         continue;
1067                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
1068                         continue;
1069
1070                 if (skip_prefix(reader->line, "filter ", &arg)) {
1071                         if (!data->filter_capability_requested)
1072                                 die("git upload-pack: filtering capability not negotiated");
1073                         list_objects_filter_die_if_populated(&data->filter_options);
1074                         parse_list_objects_filter(&data->filter_options, arg);
1075                         die_if_using_banned_filter(data);
1076                         continue;
1077                 }
1078
1079                 if (!skip_prefix(reader->line, "want ", &arg) ||
1080                     parse_oid_hex(arg, &oid_buf, &features))
1081                         die("git upload-pack: protocol error, "
1082                             "expected to get object ID, not '%s'", reader->line);
1083
1084                 if (parse_feature_request(features, "deepen-relative"))
1085                         data->deepen_relative = 1;
1086                 if (parse_feature_request(features, "multi_ack_detailed"))
1087                         data->multi_ack = MULTI_ACK_DETAILED;
1088                 else if (parse_feature_request(features, "multi_ack"))
1089                         data->multi_ack = MULTI_ACK;
1090                 if (parse_feature_request(features, "no-done"))
1091                         data->no_done = 1;
1092                 if (parse_feature_request(features, "thin-pack"))
1093                         data->use_thin_pack = 1;
1094                 if (parse_feature_request(features, "ofs-delta"))
1095                         data->use_ofs_delta = 1;
1096                 if (parse_feature_request(features, "side-band-64k"))
1097                         data->use_sideband = LARGE_PACKET_MAX;
1098                 else if (parse_feature_request(features, "side-band"))
1099                         data->use_sideband = DEFAULT_PACKET_MAX;
1100                 if (parse_feature_request(features, "no-progress"))
1101                         data->no_progress = 1;
1102                 if (parse_feature_request(features, "include-tag"))
1103                         data->use_include_tag = 1;
1104                 if (data->allow_filter &&
1105                     parse_feature_request(features, "filter"))
1106                         data->filter_capability_requested = 1;
1107
1108                 arg = parse_feature_value(features, "session-id", &feature_len, NULL);
1109                 if (arg) {
1110                         char *client_sid = xstrndup(arg, feature_len);
1111                         trace2_data_string("transfer", NULL, "client-sid", client_sid);
1112                         free(client_sid);
1113                 }
1114
1115                 o = parse_object(the_repository, &oid_buf);
1116                 if (!o) {
1117                         packet_writer_error(&data->writer,
1118                                             "upload-pack: not our ref %s",
1119                                             oid_to_hex(&oid_buf));
1120                         die("git upload-pack: not our ref %s",
1121                             oid_to_hex(&oid_buf));
1122                 }
1123                 if (!(o->flags & WANTED)) {
1124                         o->flags |= WANTED;
1125                         if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1126                               || is_our_ref(o, data->allow_uor)))
1127                                 has_non_tip = 1;
1128                         add_object_array(o, NULL, &data->want_obj);
1129                 }
1130         }
1131
1132         /*
1133          * We have sent all our refs already, and the other end
1134          * should have chosen out of them. When we are operating
1135          * in the stateless RPC mode, however, their choice may
1136          * have been based on the set of older refs advertised
1137          * by another process that handled the initial request.
1138          */
1139         if (has_non_tip)
1140                 check_non_tip(data);
1141
1142         if (!data->use_sideband && data->daemon_mode)
1143                 data->no_progress = 1;
1144
1145         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1146                 return;
1147
1148         if (send_shallow_list(data))
1149                 packet_flush(1);
1150 }
1151
1152 /* return non-zero if the ref is hidden, otherwise 0 */
1153 static int mark_our_ref(const char *refname, const char *refname_full,
1154                         const struct object_id *oid)
1155 {
1156         struct object *o = lookup_unknown_object(oid);
1157
1158         if (ref_is_hidden(refname, refname_full)) {
1159                 o->flags |= HIDDEN_REF;
1160                 return 1;
1161         }
1162         o->flags |= OUR_REF;
1163         return 0;
1164 }
1165
1166 static int check_ref(const char *refname_full, const struct object_id *oid,
1167                      int flag, void *cb_data)
1168 {
1169         const char *refname = strip_namespace(refname_full);
1170
1171         mark_our_ref(refname, refname_full, oid);
1172         return 0;
1173 }
1174
1175 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1176 {
1177         struct string_list_item *item;
1178
1179         if (!symref->nr)
1180                 return;
1181         for_each_string_list_item(item, symref)
1182                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1183 }
1184
1185 static void format_session_id(struct strbuf *buf, struct upload_pack_data *d) {
1186         if (d->advertise_sid)
1187                 strbuf_addf(buf, " session-id=%s", trace2_session_id());
1188 }
1189
1190 static int send_ref(const char *refname, const struct object_id *oid,
1191                     int flag, void *cb_data)
1192 {
1193         static const char *capabilities = "multi_ack thin-pack side-band"
1194                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1195                 " deepen-relative no-progress include-tag multi_ack_detailed";
1196         const char *refname_nons = strip_namespace(refname);
1197         struct object_id peeled;
1198         struct upload_pack_data *data = cb_data;
1199
1200         if (mark_our_ref(refname_nons, refname, oid))
1201                 return 0;
1202
1203         if (capabilities) {
1204                 struct strbuf symref_info = STRBUF_INIT;
1205                 struct strbuf session_id = STRBUF_INIT;
1206
1207                 format_symref_info(&symref_info, &data->symref);
1208                 format_session_id(&session_id, data);
1209                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
1210                              oid_to_hex(oid), refname_nons,
1211                              0, capabilities,
1212                              (data->allow_uor & ALLOW_TIP_SHA1) ?
1213                                      " allow-tip-sha1-in-want" : "",
1214                              (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
1215                                      " allow-reachable-sha1-in-want" : "",
1216                              data->stateless_rpc ? " no-done" : "",
1217                              symref_info.buf,
1218                              data->allow_filter ? " filter" : "",
1219                              session_id.buf,
1220                              the_hash_algo->name,
1221                              git_user_agent_sanitized());
1222                 strbuf_release(&symref_info);
1223                 strbuf_release(&session_id);
1224         } else {
1225                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1226         }
1227         capabilities = NULL;
1228         if (!peel_iterated_oid(oid, &peeled))
1229                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1230         return 0;
1231 }
1232
1233 static int find_symref(const char *refname, const struct object_id *oid,
1234                        int flag, void *cb_data)
1235 {
1236         const char *symref_target;
1237         struct string_list_item *item;
1238
1239         if ((flag & REF_ISSYMREF) == 0)
1240                 return 0;
1241         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1242         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1243                 die("'%s' is a symref but it is not?", refname);
1244         item = string_list_append(cb_data, strip_namespace(refname));
1245         item->util = xstrdup(strip_namespace(symref_target));
1246         return 0;
1247 }
1248
1249 static int parse_object_filter_config(const char *var, const char *value,
1250                                        struct upload_pack_data *data)
1251 {
1252         struct strbuf buf = STRBUF_INIT;
1253         const char *sub, *key;
1254         size_t sub_len;
1255
1256         if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
1257                 return 0;
1258
1259         if (!sub) {
1260                 if (!strcmp(key, "allow"))
1261                         data->allow_filter_fallback = git_config_bool(var, value);
1262                 return 0;
1263         }
1264
1265         strbuf_add(&buf, sub, sub_len);
1266
1267         if (!strcmp(key, "allow"))
1268                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1269                         (void *)(intptr_t)git_config_bool(var, value);
1270         else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
1271                 if (!value) {
1272                         strbuf_release(&buf);
1273                         return config_error_nonbool(var);
1274                 }
1275                 string_list_insert(&data->allowed_filters, buf.buf)->util =
1276                         (void *)(intptr_t)1;
1277                 data->tree_filter_max_depth = git_config_ulong(var, value);
1278         }
1279
1280         strbuf_release(&buf);
1281         return 0;
1282 }
1283
1284 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1285 {
1286         struct upload_pack_data *data = cb_data;
1287
1288         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1289                 if (git_config_bool(var, value))
1290                         data->allow_uor |= ALLOW_TIP_SHA1;
1291                 else
1292                         data->allow_uor &= ~ALLOW_TIP_SHA1;
1293         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1294                 if (git_config_bool(var, value))
1295                         data->allow_uor |= ALLOW_REACHABLE_SHA1;
1296                 else
1297                         data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
1298         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1299                 if (git_config_bool(var, value))
1300                         data->allow_uor |= ALLOW_ANY_SHA1;
1301                 else
1302                         data->allow_uor &= ~ALLOW_ANY_SHA1;
1303         } else if (!strcmp("uploadpack.keepalive", var)) {
1304                 data->keepalive = git_config_int(var, value);
1305                 if (!data->keepalive)
1306                         data->keepalive = -1;
1307         } else if (!strcmp("uploadpack.allowfilter", var)) {
1308                 data->allow_filter = git_config_bool(var, value);
1309         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1310                 data->allow_ref_in_want = git_config_bool(var, value);
1311         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1312                 data->allow_sideband_all = git_config_bool(var, value);
1313         } else if (!strcmp("core.precomposeunicode", var)) {
1314                 precomposed_unicode = git_config_bool(var, value);
1315         } else if (!strcmp("transfer.advertisesid", var)) {
1316                 data->advertise_sid = git_config_bool(var, value);
1317         }
1318
1319         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1320             current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1321                 if (!strcmp("uploadpack.packobjectshook", var))
1322                         return git_config_string(&data->pack_objects_hook, var, value);
1323         }
1324
1325         if (parse_object_filter_config(var, value, data) < 0)
1326                 return -1;
1327
1328         return parse_hide_refs_config(var, value, "uploadpack");
1329 }
1330
1331 void upload_pack(struct upload_pack_options *options)
1332 {
1333         struct packet_reader reader;
1334         struct upload_pack_data data;
1335
1336         upload_pack_data_init(&data);
1337
1338         git_config(upload_pack_config, &data);
1339
1340         data.stateless_rpc = options->stateless_rpc;
1341         data.daemon_mode = options->daemon_mode;
1342         data.timeout = options->timeout;
1343
1344         head_ref_namespaced(find_symref, &data.symref);
1345
1346         if (options->advertise_refs || !data.stateless_rpc) {
1347                 reset_timeout(data.timeout);
1348                 head_ref_namespaced(send_ref, &data);
1349                 for_each_namespaced_ref(send_ref, &data);
1350                 advertise_shallow_grafts(1);
1351                 packet_flush(1);
1352         } else {
1353                 head_ref_namespaced(check_ref, NULL);
1354                 for_each_namespaced_ref(check_ref, NULL);
1355         }
1356
1357         if (!options->advertise_refs) {
1358                 packet_reader_init(&reader, 0, NULL, 0,
1359                                    PACKET_READ_CHOMP_NEWLINE |
1360                                    PACKET_READ_DIE_ON_ERR_PACKET);
1361
1362                 receive_needs(&data, &reader);
1363
1364                 /*
1365                  * An EOF at this exact point in negotiation should be
1366                  * acceptable from stateless clients as they will consume the
1367                  * shallow list before doing subsequent rpc with haves/etc.
1368                  */
1369                 if (data.stateless_rpc)
1370                         reader.options |= PACKET_READ_GENTLE_ON_EOF;
1371
1372                 if (data.want_obj.nr &&
1373                     packet_reader_peek(&reader) != PACKET_READ_EOF) {
1374                         reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
1375                         get_common_commits(&data, &reader);
1376                         create_pack_file(&data, NULL);
1377                 }
1378         }
1379
1380         upload_pack_data_clear(&data);
1381 }
1382
1383 static int parse_want(struct packet_writer *writer, const char *line,
1384                       struct object_array *want_obj)
1385 {
1386         const char *arg;
1387         if (skip_prefix(line, "want ", &arg)) {
1388                 struct object_id oid;
1389                 struct object *o;
1390
1391                 if (get_oid_hex(arg, &oid))
1392                         die("git upload-pack: protocol error, "
1393                             "expected to get oid, not '%s'", line);
1394
1395                 o = parse_object(the_repository, &oid);
1396                 if (!o) {
1397                         packet_writer_error(writer,
1398                                             "upload-pack: not our ref %s",
1399                                             oid_to_hex(&oid));
1400                         die("git upload-pack: not our ref %s",
1401                             oid_to_hex(&oid));
1402                 }
1403
1404                 if (!(o->flags & WANTED)) {
1405                         o->flags |= WANTED;
1406                         add_object_array(o, NULL, want_obj);
1407                 }
1408
1409                 return 1;
1410         }
1411
1412         return 0;
1413 }
1414
1415 static int parse_want_ref(struct packet_writer *writer, const char *line,
1416                           struct string_list *wanted_refs,
1417                           struct object_array *want_obj)
1418 {
1419         const char *arg;
1420         if (skip_prefix(line, "want-ref ", &arg)) {
1421                 struct object_id oid;
1422                 struct string_list_item *item;
1423                 struct object *o;
1424
1425                 if (read_ref(arg, &oid)) {
1426                         packet_writer_error(writer, "unknown ref %s", arg);
1427                         die("unknown ref %s", arg);
1428                 }
1429
1430                 item = string_list_append(wanted_refs, arg);
1431                 item->util = oiddup(&oid);
1432
1433                 o = parse_object_or_die(&oid, arg);
1434                 if (!(o->flags & WANTED)) {
1435                         o->flags |= WANTED;
1436                         add_object_array(o, NULL, want_obj);
1437                 }
1438
1439                 return 1;
1440         }
1441
1442         return 0;
1443 }
1444
1445 static int parse_have(const char *line, struct oid_array *haves)
1446 {
1447         const char *arg;
1448         if (skip_prefix(line, "have ", &arg)) {
1449                 struct object_id oid;
1450
1451                 if (get_oid_hex(arg, &oid))
1452                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1453                 oid_array_append(haves, &oid);
1454                 return 1;
1455         }
1456
1457         return 0;
1458 }
1459
1460 static void process_args(struct packet_reader *request,
1461                          struct upload_pack_data *data)
1462 {
1463         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1464                 const char *arg = request->line;
1465                 const char *p;
1466
1467                 /* process want */
1468                 if (parse_want(&data->writer, arg, &data->want_obj))
1469                         continue;
1470                 if (data->allow_ref_in_want &&
1471                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1472                                    &data->want_obj))
1473                         continue;
1474                 /* process have line */
1475                 if (parse_have(arg, &data->haves))
1476                         continue;
1477
1478                 /* process args like thin-pack */
1479                 if (!strcmp(arg, "thin-pack")) {
1480                         data->use_thin_pack = 1;
1481                         continue;
1482                 }
1483                 if (!strcmp(arg, "ofs-delta")) {
1484                         data->use_ofs_delta = 1;
1485                         continue;
1486                 }
1487                 if (!strcmp(arg, "no-progress")) {
1488                         data->no_progress = 1;
1489                         continue;
1490                 }
1491                 if (!strcmp(arg, "include-tag")) {
1492                         data->use_include_tag = 1;
1493                         continue;
1494                 }
1495                 if (!strcmp(arg, "done")) {
1496                         data->done = 1;
1497                         continue;
1498                 }
1499
1500                 /* Shallow related arguments */
1501                 if (process_shallow(arg, &data->shallows))
1502                         continue;
1503                 if (process_deepen(arg, &data->depth))
1504                         continue;
1505                 if (process_deepen_since(arg, &data->deepen_since,
1506                                          &data->deepen_rev_list))
1507                         continue;
1508                 if (process_deepen_not(arg, &data->deepen_not,
1509                                        &data->deepen_rev_list))
1510                         continue;
1511                 if (!strcmp(arg, "deepen-relative")) {
1512                         data->deepen_relative = 1;
1513                         continue;
1514                 }
1515
1516                 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1517                         list_objects_filter_die_if_populated(&data->filter_options);
1518                         parse_list_objects_filter(&data->filter_options, p);
1519                         die_if_using_banned_filter(data);
1520                         continue;
1521                 }
1522
1523                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1524                      data->allow_sideband_all) &&
1525                     !strcmp(arg, "sideband-all")) {
1526                         data->writer.use_sideband = 1;
1527                         continue;
1528                 }
1529
1530                 if (skip_prefix(arg, "packfile-uris ", &p)) {
1531                         string_list_split(&data->uri_protocols, p, ',', -1);
1532                         continue;
1533                 }
1534
1535                 /* ignore unknown lines maybe? */
1536                 die("unexpected line: '%s'", arg);
1537         }
1538
1539         if (data->uri_protocols.nr && !data->writer.use_sideband)
1540                 string_list_clear(&data->uri_protocols, 0);
1541
1542         if (request->status != PACKET_READ_FLUSH)
1543                 die(_("expected flush after fetch arguments"));
1544 }
1545
1546 static int process_haves(struct upload_pack_data *data, struct oid_array *common)
1547 {
1548         int i;
1549
1550         /* Process haves */
1551         for (i = 0; i < data->haves.nr; i++) {
1552                 const struct object_id *oid = &data->haves.oid[i];
1553
1554                 if (!has_object_file_with_flags(oid,
1555                                                 OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT))
1556                         continue;
1557
1558                 oid_array_append(common, oid);
1559
1560                 do_got_oid(data, oid);
1561         }
1562
1563         return 0;
1564 }
1565
1566 static int send_acks(struct upload_pack_data *data, struct oid_array *acks)
1567 {
1568         int i;
1569
1570         packet_writer_write(&data->writer, "acknowledgments\n");
1571
1572         /* Send Acks */
1573         if (!acks->nr)
1574                 packet_writer_write(&data->writer, "NAK\n");
1575
1576         for (i = 0; i < acks->nr; i++) {
1577                 packet_writer_write(&data->writer, "ACK %s\n",
1578                                     oid_to_hex(&acks->oid[i]));
1579         }
1580
1581         if (ok_to_give_up(data)) {
1582                 /* Send Ready */
1583                 packet_writer_write(&data->writer, "ready\n");
1584                 return 1;
1585         }
1586
1587         return 0;
1588 }
1589
1590 static int process_haves_and_send_acks(struct upload_pack_data *data)
1591 {
1592         struct oid_array common = OID_ARRAY_INIT;
1593         int ret = 0;
1594
1595         process_haves(data, &common);
1596         if (data->done) {
1597                 ret = 1;
1598         } else if (send_acks(data, &common)) {
1599                 packet_writer_delim(&data->writer);
1600                 ret = 1;
1601         } else {
1602                 /* Add Flush */
1603                 packet_writer_flush(&data->writer);
1604                 ret = 0;
1605         }
1606
1607         oid_array_clear(&data->haves);
1608         oid_array_clear(&common);
1609         return ret;
1610 }
1611
1612 static void send_wanted_ref_info(struct upload_pack_data *data)
1613 {
1614         const struct string_list_item *item;
1615
1616         if (!data->wanted_refs.nr)
1617                 return;
1618
1619         packet_writer_write(&data->writer, "wanted-refs\n");
1620
1621         for_each_string_list_item(item, &data->wanted_refs) {
1622                 packet_writer_write(&data->writer, "%s %s\n",
1623                                     oid_to_hex(item->util),
1624                                     item->string);
1625         }
1626
1627         packet_writer_delim(&data->writer);
1628 }
1629
1630 static void send_shallow_info(struct upload_pack_data *data)
1631 {
1632         /* No shallow info needs to be sent */
1633         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1634             !is_repository_shallow(the_repository))
1635                 return;
1636
1637         packet_writer_write(&data->writer, "shallow-info\n");
1638
1639         if (!send_shallow_list(data) &&
1640             is_repository_shallow(the_repository))
1641                 deepen(data, INFINITE_DEPTH);
1642
1643         packet_delim(1);
1644 }
1645
1646 enum fetch_state {
1647         FETCH_PROCESS_ARGS = 0,
1648         FETCH_SEND_ACKS,
1649         FETCH_SEND_PACK,
1650         FETCH_DONE,
1651 };
1652
1653 int upload_pack_v2(struct repository *r, struct strvec *keys,
1654                    struct packet_reader *request)
1655 {
1656         enum fetch_state state = FETCH_PROCESS_ARGS;
1657         struct upload_pack_data data;
1658
1659         clear_object_flags(ALL_FLAGS);
1660
1661         upload_pack_data_init(&data);
1662         data.use_sideband = LARGE_PACKET_MAX;
1663
1664         git_config(upload_pack_config, &data);
1665
1666         while (state != FETCH_DONE) {
1667                 switch (state) {
1668                 case FETCH_PROCESS_ARGS:
1669                         process_args(request, &data);
1670
1671                         if (!data.want_obj.nr) {
1672                                 /*
1673                                  * Request didn't contain any 'want' lines,
1674                                  * guess they didn't want anything.
1675                                  */
1676                                 state = FETCH_DONE;
1677                         } else if (data.haves.nr) {
1678                                 /*
1679                                  * Request had 'have' lines, so lets ACK them.
1680                                  */
1681                                 state = FETCH_SEND_ACKS;
1682                         } else {
1683                                 /*
1684                                  * Request had 'want's but no 'have's so we can
1685                                  * immedietly go to construct and send a pack.
1686                                  */
1687                                 state = FETCH_SEND_PACK;
1688                         }
1689                         break;
1690                 case FETCH_SEND_ACKS:
1691                         if (process_haves_and_send_acks(&data))
1692                                 state = FETCH_SEND_PACK;
1693                         else
1694                                 state = FETCH_DONE;
1695                         break;
1696                 case FETCH_SEND_PACK:
1697                         send_wanted_ref_info(&data);
1698                         send_shallow_info(&data);
1699
1700                         if (data.uri_protocols.nr) {
1701                                 create_pack_file(&data, &data.uri_protocols);
1702                         } else {
1703                                 packet_writer_write(&data.writer, "packfile\n");
1704                                 create_pack_file(&data, NULL);
1705                         }
1706                         state = FETCH_DONE;
1707                         break;
1708                 case FETCH_DONE:
1709                         continue;
1710                 }
1711         }
1712
1713         upload_pack_data_clear(&data);
1714         return 0;
1715 }
1716
1717 int upload_pack_advertise(struct repository *r,
1718                           struct strbuf *value)
1719 {
1720         if (value) {
1721                 int allow_filter_value;
1722                 int allow_ref_in_want;
1723                 int allow_sideband_all_value;
1724                 char *str = NULL;
1725
1726                 strbuf_addstr(value, "shallow");
1727
1728                 if (!repo_config_get_bool(the_repository,
1729                                          "uploadpack.allowfilter",
1730                                          &allow_filter_value) &&
1731                     allow_filter_value)
1732                         strbuf_addstr(value, " filter");
1733
1734                 if (!repo_config_get_bool(the_repository,
1735                                          "uploadpack.allowrefinwant",
1736                                          &allow_ref_in_want) &&
1737                     allow_ref_in_want)
1738                         strbuf_addstr(value, " ref-in-want");
1739
1740                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1741                     (!repo_config_get_bool(the_repository,
1742                                            "uploadpack.allowsidebandall",
1743                                            &allow_sideband_all_value) &&
1744                      allow_sideband_all_value))
1745                         strbuf_addstr(value, " sideband-all");
1746
1747                 if (!repo_config_get_string(the_repository,
1748                                             "uploadpack.blobpackfileuri",
1749                                             &str) &&
1750                     str) {
1751                         strbuf_addstr(value, " packfile-uris");
1752                         free(str);
1753                 }
1754         }
1755
1756         return 1;
1757 }