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 static timestamp_t oldest_have;
  46
  47 /* Values for allow_unadvertised_object_request flags */
  48 /* Allow specifying sha1 if it is a ref tip. */
  49 #define ALLOW_TIP_SHA1  01
  50 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  51 #define ALLOW_REACHABLE_SHA1    02
  52 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  53 #define ALLOW_ANY_SHA1  07
  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
  76         unsigned int timeout;                                   /* v0 only */
  77         enum {
  78                 NO_MULTI_ACK = 0,
  79                 MULTI_ACK = 1,
  80                 MULTI_ACK_DETAILED = 2
  81         } multi_ack;                                            /* v0 only */
  82
  83         /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
  84         int use_sideband;
  85
  86         /* See ALLOW_* values defined above */
  87         unsigned int allow_unadvertised_object_request;
  88
  89         struct list_objects_filter_options filter_options;
  90
  91         struct packet_writer writer;
  92
  93         const char *pack_objects_hook;
  94
  95         unsigned stateless_rpc : 1;                             /* v0 only */
  96         unsigned no_done : 1;                                   /* v0 only */
  97         unsigned daemon_mode : 1;                               /* v0 only */
  98         unsigned filter_capability_requested : 1;               /* v0 only */
  99
 100         unsigned use_thin_pack : 1;
 101         unsigned use_ofs_delta : 1;
 102         unsigned no_progress : 1;
 103         unsigned use_include_tag : 1;
 104         unsigned allow_filter : 1;
 105
 106         unsigned done : 1;                                      /* v2 only */
 107         unsigned allow_ref_in_want : 1;                         /* v2 only */
 108         unsigned allow_sideband_all : 1;                        /* v2 only */
 109 };
 110
 111 static void upload_pack_data_init(struct upload_pack_data *data)
 112 {
 113         struct string_list symref = STRING_LIST_INIT_DUP;
 114         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 115         struct object_array want_obj = OBJECT_ARRAY_INIT;
 116         struct object_array have_obj = OBJECT_ARRAY_INIT;
 117         struct oid_array haves = OID_ARRAY_INIT;
 118         struct object_array shallows = OBJECT_ARRAY_INIT;
 119         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 120         struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
 121
 122         memset(data, 0, sizeof(*data));
 123         data->symref = symref;
 124         data->wanted_refs = wanted_refs;
 125         data->want_obj = want_obj;
 126         data->have_obj = have_obj;
 127         data->haves = haves;
 128         data->shallows = shallows;
 129         data->deepen_not = deepen_not;
 130         data->extra_edge_obj = extra_edge_obj;
 131         packet_writer_init(&data->writer, 1);
 132
 133         data->keepalive = 5;
 134 }
 135
 136 static void upload_pack_data_clear(struct upload_pack_data *data)
 137 {
 138         string_list_clear(&data->symref, 1);
 139         string_list_clear(&data->wanted_refs, 1);
 140         object_array_clear(&data->want_obj);
 141         object_array_clear(&data->have_obj);
 142         oid_array_clear(&data->haves);
 143         object_array_clear(&data->shallows);
 144         string_list_clear(&data->deepen_not, 0);
 145         object_array_clear(&data->extra_edge_obj);
 146         list_objects_filter_release(&data->filter_options);
 147
 148         free((char *)data->pack_objects_hook);
 149 }
 150
 151 static void reset_timeout(unsigned int timeout)
 152 {
 153         alarm(timeout);
 154 }
 155
 156 static void send_client_data(int fd, const char *data, ssize_t sz,
 157                              int use_sideband)
 158 {
 159         if (use_sideband) {
 160                 send_sideband(1, fd, data, sz, use_sideband);
 161                 return;
 162         }
 163         if (fd == 3)
 164                 /* emergency quit */
 165                 fd = 2;
 166         if (fd == 2) {
 167                 /* XXX: are we happy to lose stuff here? */
 168                 xwrite(fd, data, sz);
 169                 return;
 170         }
 171         write_or_die(fd, data, sz);
 172 }
 173
 174 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 175 {
 176         FILE *fp = cb_data;
 177         if (graft->nr_parent == -1)
 178                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 179         return 0;
 180 }
 181
 182 static void create_pack_file(struct upload_pack_data *pack_data)
 183 {
 184         struct child_process pack_objects = CHILD_PROCESS_INIT;
 185         char data[8193], progress[128];
 186         char abort_msg[] = "aborting due to possible repository "
 187                 "corruption on the remote side.";
 188         int buffered = -1;
 189         ssize_t sz;
 190         int i;
 191         FILE *pipe_fd;
 192
 193         if (!pack_data->pack_objects_hook)
 194                 pack_objects.git_cmd = 1;
 195         else {
 196                 argv_array_push(&pack_objects.args, pack_data->pack_objects_hook);
 197                 argv_array_push(&pack_objects.args, "git");
 198                 pack_objects.use_shell = 1;
 199         }
 200
 201         if (pack_data->shallow_nr) {
 202                 argv_array_push(&pack_objects.args, "--shallow-file");
 203                 argv_array_push(&pack_objects.args, "");
 204         }
 205         argv_array_push(&pack_objects.args, "pack-objects");
 206         argv_array_push(&pack_objects.args, "--revs");
 207         if (pack_data->use_thin_pack)
 208                 argv_array_push(&pack_objects.args, "--thin");
 209
 210         argv_array_push(&pack_objects.args, "--stdout");
 211         if (pack_data->shallow_nr)
 212                 argv_array_push(&pack_objects.args, "--shallow");
 213         if (!pack_data->no_progress)
 214                 argv_array_push(&pack_objects.args, "--progress");
 215         if (pack_data->use_ofs_delta)
 216                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 217         if (pack_data->use_include_tag)
 218                 argv_array_push(&pack_objects.args, "--include-tag");
 219         if (pack_data->filter_options.choice) {
 220                 const char *spec =
 221                         expand_list_objects_filter_spec(&pack_data->filter_options);
 222                 if (pack_objects.use_shell) {
 223                         struct strbuf buf = STRBUF_INIT;
 224                         sq_quote_buf(&buf, spec);
 225                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 226                         strbuf_release(&buf);
 227                 } else {
 228                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 229                                          spec);
 230                 }
 231         }
 232
 233         pack_objects.in = -1;
 234         pack_objects.out = -1;
 235         pack_objects.err = -1;
 236
 237         if (start_command(&pack_objects))
 238                 die("git upload-pack: unable to fork git-pack-objects");
 239
 240         pipe_fd = xfdopen(pack_objects.in, "w");
 241
 242         if (pack_data->shallow_nr)
 243                 for_each_commit_graft(write_one_shallow, pipe_fd);
 244
 245         for (i = 0; i < pack_data->want_obj.nr; i++)
 246                 fprintf(pipe_fd, "%s\n",
 247                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 248         fprintf(pipe_fd, "--not\n");
 249         for (i = 0; i < pack_data->have_obj.nr; i++)
 250                 fprintf(pipe_fd, "%s\n",
 251                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 252         for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
 253                 fprintf(pipe_fd, "%s\n",
 254                         oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
 255         fprintf(pipe_fd, "\n");
 256         fflush(pipe_fd);
 257         fclose(pipe_fd);
 258
 259         /* We read from pack_objects.err to capture stderr output for
 260          * progress bar, and pack_objects.out to capture the pack data.
 261          */
 262
 263         while (1) {
 264                 struct pollfd pfd[2];
 265                 int pe, pu, pollsize, polltimeout;
 266                 int ret;
 267
 268                 reset_timeout(pack_data->timeout);
 269
 270                 pollsize = 0;
 271                 pe = pu = -1;
 272
 273                 if (0 <= pack_objects.out) {
 274                         pfd[pollsize].fd = pack_objects.out;
 275                         pfd[pollsize].events = POLLIN;
 276                         pu = pollsize;
 277                         pollsize++;
 278                 }
 279                 if (0 <= pack_objects.err) {
 280                         pfd[pollsize].fd = pack_objects.err;
 281                         pfd[pollsize].events = POLLIN;
 282                         pe = pollsize;
 283                         pollsize++;
 284                 }
 285
 286                 if (!pollsize)
 287                         break;
 288
 289                 polltimeout = pack_data->keepalive < 0
 290                         ? -1
 291                         : 1000 * pack_data->keepalive;
 292
 293                 ret = poll(pfd, pollsize, polltimeout);
 294
 295                 if (ret < 0) {
 296                         if (errno != EINTR) {
 297                                 error_errno("poll failed, resuming");
 298                                 sleep(1);
 299                         }
 300                         continue;
 301                 }
 302                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 303                         /* Status ready; we ship that in the side-band
 304                          * or dump to the standard error.
 305                          */
 306                         sz = xread(pack_objects.err, progress,
 307                                   sizeof(progress));
 308                         if (0 < sz)
 309                                 send_client_data(2, progress, sz,
 310                                                  pack_data->use_sideband);
 311                         else if (sz == 0) {
 312                                 close(pack_objects.err);
 313                                 pack_objects.err = -1;
 314                         }
 315                         else
 316                                 goto fail;
 317                         /* give priority to status messages */
 318                         continue;
 319                 }
 320                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 321                         /* Data ready; we keep the last byte to ourselves
 322                          * in case we detect broken rev-list, so that we
 323                          * can leave the stream corrupted.  This is
 324                          * unfortunate -- unpack-objects would happily
 325                          * accept a valid packdata with trailing garbage,
 326                          * so appending garbage after we pass all the
 327                          * pack data is not good enough to signal
 328                          * breakage to downstream.
 329                          */
 330                         char *cp = data;
 331                         ssize_t outsz = 0;
 332                         if (0 <= buffered) {
 333                                 *cp++ = buffered;
 334                                 outsz++;
 335                         }
 336                         sz = xread(pack_objects.out, cp,
 337                                   sizeof(data) - outsz);
 338                         if (0 < sz)
 339                                 ;
 340                         else if (sz == 0) {
 341                                 close(pack_objects.out);
 342                                 pack_objects.out = -1;
 343                         }
 344                         else
 345                                 goto fail;
 346                         sz += outsz;
 347                         if (1 < sz) {
 348                                 buffered = data[sz-1] & 0xFF;
 349                                 sz--;
 350                         }
 351                         else
 352                                 buffered = -1;
 353                         send_client_data(1, data, sz,
 354                                          pack_data->use_sideband);
 355                 }
 356
 357                 /*
 358                  * We hit the keepalive timeout without saying anything; send
 359                  * an empty message on the data sideband just to let the other
 360                  * side know we're still working on it, but don't have any data
 361                  * yet.
 362                  *
 363                  * If we don't have a sideband channel, there's no room in the
 364                  * protocol to say anything, so those clients are just out of
 365                  * luck.
 366                  */
 367                 if (!ret && pack_data->use_sideband) {
 368                         static const char buf[] = "0005\1";
 369                         write_or_die(1, buf, 5);
 370                 }
 371         }
 372
 373         if (finish_command(&pack_objects)) {
 374                 error("git upload-pack: git-pack-objects died with error.");
 375                 goto fail;
 376         }
 377
 378         /* flush the data */
 379         if (0 <= buffered) {
 380                 data[0] = buffered;
 381                 send_client_data(1, data, 1,
 382                                  pack_data->use_sideband);
 383                 fprintf(stderr, "flushed.\n");
 384         }
 385         if (pack_data->use_sideband)
 386                 packet_flush(1);
 387         return;
 388
 389  fail:
 390         send_client_data(3, abort_msg, sizeof(abort_msg),
 391                          pack_data->use_sideband);
 392         die("git upload-pack: %s", abort_msg);
 393 }
 394
 395 static int got_oid(const char *hex, struct object_id *oid,
 396                    struct object_array *have_obj)
 397 {
 398         struct object *o;
 399         int we_knew_they_have = 0;
 400
 401         if (get_oid_hex(hex, oid))
 402                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 403         if (!has_object_file(oid))
 404                 return -1;
 405
 406         o = parse_object(the_repository, oid);
 407         if (!o)
 408                 die("oops (%s)", oid_to_hex(oid));
 409         if (o->type == OBJ_COMMIT) {
 410                 struct commit_list *parents;
 411                 struct commit *commit = (struct commit *)o;
 412                 if (o->flags & THEY_HAVE)
 413                         we_knew_they_have = 1;
 414                 else
 415                         o->flags |= THEY_HAVE;
 416                 if (!oldest_have || (commit->date < oldest_have))
 417                         oldest_have = commit->date;
 418                 for (parents = commit->parents;
 419                      parents;
 420                      parents = parents->next)
 421                         parents->item->object.flags |= THEY_HAVE;
 422         }
 423         if (!we_knew_they_have) {
 424                 add_object_array(o, NULL, have_obj);
 425                 return 1;
 426         }
 427         return 0;
 428 }
 429
 430 static int ok_to_give_up(const struct object_array *have_obj,
 431                          struct object_array *want_obj)
 432 {
 433         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 434
 435         if (!have_obj->nr)
 436                 return 0;
 437
 438         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 439                                             COMMON_KNOWN, oldest_have,
 440                                             min_generation);
 441 }
 442
 443 static int get_common_commits(struct upload_pack_data *data,
 444                               struct packet_reader *reader)
 445 {
 446         struct object_id oid;
 447         char last_hex[GIT_MAX_HEXSZ + 1];
 448         int got_common = 0;
 449         int got_other = 0;
 450         int sent_ready = 0;
 451
 452         save_commit_buffer = 0;
 453
 454         for (;;) {
 455                 const char *arg;
 456
 457                 reset_timeout(data->timeout);
 458
 459                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 460                         if (data->multi_ack == MULTI_ACK_DETAILED
 461                             && got_common
 462                             && !got_other
 463                             && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 464                                 sent_ready = 1;
 465                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 466                         }
 467                         if (data->have_obj.nr == 0 || data->multi_ack)
 468                                 packet_write_fmt(1, "NAK\n");
 469
 470                         if (data->no_done && sent_ready) {
 471                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 472                                 return 0;
 473                         }
 474                         if (data->stateless_rpc)
 475                                 exit(0);
 476                         got_common = 0;
 477                         got_other = 0;
 478                         continue;
 479                 }
 480                 if (skip_prefix(reader->line, "have ", &arg)) {
 481                         switch (got_oid(arg, &oid, &data->have_obj)) {
 482                         case -1: /* they have what we do not */
 483                                 got_other = 1;
 484                                 if (data->multi_ack
 485                                     && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 486                                         const char *hex = oid_to_hex(&oid);
 487                                         if (data->multi_ack == MULTI_ACK_DETAILED) {
 488                                                 sent_ready = 1;
 489                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 490                                         } else
 491                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 492                                 }
 493                                 break;
 494                         default:
 495                                 got_common = 1;
 496                                 oid_to_hex_r(last_hex, &oid);
 497                                 if (data->multi_ack == MULTI_ACK_DETAILED)
 498                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 499                                 else if (data->multi_ack)
 500                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 501                                 else if (data->have_obj.nr == 1)
 502                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 503                                 break;
 504                         }
 505                         continue;
 506                 }
 507                 if (!strcmp(reader->line, "done")) {
 508                         if (data->have_obj.nr > 0) {
 509                                 if (data->multi_ack)
 510                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 511                                 return 0;
 512                         }
 513                         packet_write_fmt(1, "NAK\n");
 514                         return -1;
 515                 }
 516                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 517         }
 518 }
 519
 520 static int is_our_ref(struct object *o,
 521                       unsigned int allow_unadvertised_object_request)
 522 {
 523         int allow_hidden_ref = (allow_unadvertised_object_request &
 524                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 525         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 526 }
 527
 528 /*
 529  * on successful case, it's up to the caller to close cmd->out
 530  */
 531 static int do_reachable_revlist(struct child_process *cmd,
 532                                 struct object_array *src,
 533                                 struct object_array *reachable,
 534                                 unsigned int allow_unadvertised_object_request)
 535 {
 536         static const char *argv[] = {
 537                 "rev-list", "--stdin", NULL,
 538         };
 539         struct object *o;
 540         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 541         int i;
 542         const unsigned hexsz = the_hash_algo->hexsz;
 543
 544         cmd->argv = argv;
 545         cmd->git_cmd = 1;
 546         cmd->no_stderr = 1;
 547         cmd->in = -1;
 548         cmd->out = -1;
 549
 550         /*
 551          * If the next rev-list --stdin encounters an unknown commit,
 552          * it terminates, which will cause SIGPIPE in the write loop
 553          * below.
 554          */
 555         sigchain_push(SIGPIPE, SIG_IGN);
 556
 557         if (start_command(cmd))
 558                 goto error;
 559
 560         namebuf[0] = '^';
 561         namebuf[hexsz + 1] = '\n';
 562         for (i = get_max_object_index(); 0 < i; ) {
 563                 o = get_indexed_object(--i);
 564                 if (!o)
 565                         continue;
 566                 if (reachable && o->type == OBJ_COMMIT)
 567                         o->flags &= ~TMP_MARK;
 568                 if (!is_our_ref(o, allow_unadvertised_object_request))
 569                         continue;
 570                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 571                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 572                         goto error;
 573         }
 574         namebuf[hexsz] = '\n';
 575         for (i = 0; i < src->nr; i++) {
 576                 o = src->objects[i].item;
 577                 if (is_our_ref(o, allow_unadvertised_object_request)) {
 578                         if (reachable)
 579                                 add_object_array(o, NULL, reachable);
 580                         continue;
 581                 }
 582                 if (reachable && o->type == OBJ_COMMIT)
 583                         o->flags |= TMP_MARK;
 584                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 585                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 586                         goto error;
 587         }
 588         close(cmd->in);
 589         cmd->in = -1;
 590         sigchain_pop(SIGPIPE);
 591
 592         return 0;
 593
 594 error:
 595         sigchain_pop(SIGPIPE);
 596
 597         if (cmd->in >= 0)
 598                 close(cmd->in);
 599         if (cmd->out >= 0)
 600                 close(cmd->out);
 601         return -1;
 602 }
 603
 604 static int get_reachable_list(struct upload_pack_data *data,
 605                               struct object_array *reachable)
 606 {
 607         struct child_process cmd = CHILD_PROCESS_INIT;
 608         int i;
 609         struct object *o;
 610         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 611         const unsigned hexsz = the_hash_algo->hexsz;
 612
 613         if (do_reachable_revlist(&cmd, &data->shallows, reachable,
 614                                  data->allow_unadvertised_object_request) < 0)
 615                 return -1;
 616
 617         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 618                 struct object_id oid;
 619                 const char *p;
 620
 621                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 622                         break;
 623
 624                 o = lookup_object(the_repository, &oid);
 625                 if (o && o->type == OBJ_COMMIT) {
 626                         o->flags &= ~TMP_MARK;
 627                 }
 628         }
 629         for (i = get_max_object_index(); 0 < i; i--) {
 630                 o = get_indexed_object(i - 1);
 631                 if (o && o->type == OBJ_COMMIT &&
 632                     (o->flags & TMP_MARK)) {
 633                         add_object_array(o, NULL, reachable);
 634                                 o->flags &= ~TMP_MARK;
 635                 }
 636         }
 637         close(cmd.out);
 638
 639         if (finish_command(&cmd))
 640                 return -1;
 641
 642         return 0;
 643 }
 644
 645 static int has_unreachable(struct object_array *src,
 646                            unsigned int allow_unadvertised_object_request)
 647 {
 648         struct child_process cmd = CHILD_PROCESS_INIT;
 649         char buf[1];
 650         int i;
 651
 652         if (do_reachable_revlist(&cmd, src, NULL,
 653                                  allow_unadvertised_object_request) < 0)
 654                 return 1;
 655
 656         /*
 657          * The commits out of the rev-list are not ancestors of
 658          * our ref.
 659          */
 660         i = read_in_full(cmd.out, buf, 1);
 661         if (i)
 662                 goto error;
 663         close(cmd.out);
 664         cmd.out = -1;
 665
 666         /*
 667          * rev-list may have died by encountering a bad commit
 668          * in the history, in which case we do want to bail out
 669          * even when it showed no commit.
 670          */
 671         if (finish_command(&cmd))
 672                 goto error;
 673
 674         /* All the non-tip ones are ancestors of what we advertised */
 675         return 0;
 676
 677 error:
 678         sigchain_pop(SIGPIPE);
 679         if (cmd.out >= 0)
 680                 close(cmd.out);
 681         return 1;
 682 }
 683
 684 static void check_non_tip(struct upload_pack_data *data)
 685 {
 686         int i;
 687
 688         /*
 689          * In the normal in-process case without
 690          * uploadpack.allowReachableSHA1InWant,
 691          * non-tip requests can never happen.
 692          */
 693         if (!data->stateless_rpc
 694             && !(data->allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 695                 goto error;
 696         if (!has_unreachable(&data->want_obj,
 697                              data->allow_unadvertised_object_request))
 698                 /* All the non-tip ones are ancestors of what we advertised */
 699                 return;
 700
 701 error:
 702         /* Pick one of them (we know there at least is one) */
 703         for (i = 0; i < data->want_obj.nr; i++) {
 704                 struct object *o = data->want_obj.objects[i].item;
 705                 if (!is_our_ref(o, data->allow_unadvertised_object_request)) {
 706                         packet_writer_error(&data->writer,
 707                                             "upload-pack: not our ref %s",
 708                                             oid_to_hex(&o->oid));
 709                         die("git upload-pack: not our ref %s",
 710                             oid_to_hex(&o->oid));
 711                 }
 712         }
 713 }
 714
 715 static void send_shallow(struct upload_pack_data *data,
 716                          struct commit_list *result)
 717 {
 718         while (result) {
 719                 struct object *object = &result->item->object;
 720                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 721                         packet_writer_write(&data->writer, "shallow %s",
 722                                             oid_to_hex(&object->oid));
 723                         register_shallow(the_repository, &object->oid);
 724                         data->shallow_nr++;
 725                 }
 726                 result = result->next;
 727         }
 728 }
 729
 730 static void send_unshallow(struct upload_pack_data *data)
 731 {
 732         int i;
 733
 734         for (i = 0; i < data->shallows.nr; i++) {
 735                 struct object *object = data->shallows.objects[i].item;
 736                 if (object->flags & NOT_SHALLOW) {
 737                         struct commit_list *parents;
 738                         packet_writer_write(&data->writer, "unshallow %s",
 739                                             oid_to_hex(&object->oid));
 740                         object->flags &= ~CLIENT_SHALLOW;
 741                         /*
 742                          * We want to _register_ "object" as shallow, but we
 743                          * also need to traverse object's parents to deepen a
 744                          * shallow clone. Unregister it for now so we can
 745                          * parse and add the parents to the want list, then
 746                          * re-register it.
 747                          */
 748                         unregister_shallow(&object->oid);
 749                         object->parsed = 0;
 750                         parse_commit_or_die((struct commit *)object);
 751                         parents = ((struct commit *)object)->parents;
 752                         while (parents) {
 753                                 add_object_array(&parents->item->object,
 754                                                  NULL, &data->want_obj);
 755                                 parents = parents->next;
 756                         }
 757                         add_object_array(object, NULL, &data->extra_edge_obj);
 758                 }
 759                 /* make sure commit traversal conforms to client */
 760                 register_shallow(the_repository, &object->oid);
 761         }
 762 }
 763
 764 static int check_ref(const char *refname_full, const struct object_id *oid,
 765                      int flag, void *cb_data);
 766 static void deepen(struct upload_pack_data *data, int depth)
 767 {
 768         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 769                 int i;
 770
 771                 for (i = 0; i < data->shallows.nr; i++) {
 772                         struct object *object = data->shallows.objects[i].item;
 773                         object->flags |= NOT_SHALLOW;
 774                 }
 775         } else if (data->deepen_relative) {
 776                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 777                 struct commit_list *result;
 778
 779                 /*
 780                  * Checking for reachable shallows requires that our refs be
 781                  * marked with OUR_REF.
 782                  */
 783                 head_ref_namespaced(check_ref, NULL);
 784                 for_each_namespaced_ref(check_ref, NULL);
 785
 786                 get_reachable_list(data, &reachable_shallows);
 787                 result = get_shallow_commits(&reachable_shallows,
 788                                              depth + 1,
 789                                              SHALLOW, NOT_SHALLOW);
 790                 send_shallow(data, result);
 791                 free_commit_list(result);
 792                 object_array_clear(&reachable_shallows);
 793         } else {
 794                 struct commit_list *result;
 795
 796                 result = get_shallow_commits(&data->want_obj, depth,
 797                                              SHALLOW, NOT_SHALLOW);
 798                 send_shallow(data, result);
 799                 free_commit_list(result);
 800         }
 801
 802         send_unshallow(data);
 803 }
 804
 805 static void deepen_by_rev_list(struct upload_pack_data *data,
 806                                int ac,
 807                                const char **av)
 808 {
 809         struct commit_list *result;
 810
 811         disable_commit_graph(the_repository);
 812         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 813         send_shallow(data, result);
 814         free_commit_list(result);
 815         send_unshallow(data);
 816 }
 817
 818 /* Returns 1 if a shallow list is sent or 0 otherwise */
 819 static int send_shallow_list(struct upload_pack_data *data)
 820 {
 821         int ret = 0;
 822
 823         if (data->depth > 0 && data->deepen_rev_list)
 824                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 825         if (data->depth > 0) {
 826                 deepen(data, data->depth);
 827                 ret = 1;
 828         } else if (data->deepen_rev_list) {
 829                 struct argv_array av = ARGV_ARRAY_INIT;
 830                 int i;
 831
 832                 argv_array_push(&av, "rev-list");
 833                 if (data->deepen_since)
 834                         argv_array_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
 835                 if (data->deepen_not.nr) {
 836                         argv_array_push(&av, "--not");
 837                         for (i = 0; i < data->deepen_not.nr; i++) {
 838                                 struct string_list_item *s = data->deepen_not.items + i;
 839                                 argv_array_push(&av, s->string);
 840                         }
 841                         argv_array_push(&av, "--not");
 842                 }
 843                 for (i = 0; i < data->want_obj.nr; i++) {
 844                         struct object *o = data->want_obj.objects[i].item;
 845                         argv_array_push(&av, oid_to_hex(&o->oid));
 846                 }
 847                 deepen_by_rev_list(data, av.argc, av.argv);
 848                 argv_array_clear(&av);
 849                 ret = 1;
 850         } else {
 851                 if (data->shallows.nr > 0) {
 852                         int i;
 853                         for (i = 0; i < data->shallows.nr; i++)
 854                                 register_shallow(the_repository,
 855                                                  &data->shallows.objects[i].item->oid);
 856                 }
 857         }
 858
 859         data->shallow_nr += data->shallows.nr;
 860         return ret;
 861 }
 862
 863 static int process_shallow(const char *line, struct object_array *shallows)
 864 {
 865         const char *arg;
 866         if (skip_prefix(line, "shallow ", &arg)) {
 867                 struct object_id oid;
 868                 struct object *object;
 869                 if (get_oid_hex(arg, &oid))
 870                         die("invalid shallow line: %s", line);
 871                 object = parse_object(the_repository, &oid);
 872                 if (!object)
 873                         return 1;
 874                 if (object->type != OBJ_COMMIT)
 875                         die("invalid shallow object %s", oid_to_hex(&oid));
 876                 if (!(object->flags & CLIENT_SHALLOW)) {
 877                         object->flags |= CLIENT_SHALLOW;
 878                         add_object_array(object, NULL, shallows);
 879                 }
 880                 return 1;
 881         }
 882
 883         return 0;
 884 }
 885
 886 static int process_deepen(const char *line, int *depth)
 887 {
 888         const char *arg;
 889         if (skip_prefix(line, "deepen ", &arg)) {
 890                 char *end = NULL;
 891                 *depth = (int)strtol(arg, &end, 0);
 892                 if (!end || *end || *depth <= 0)
 893                         die("Invalid deepen: %s", line);
 894                 return 1;
 895         }
 896
 897         return 0;
 898 }
 899
 900 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 901 {
 902         const char *arg;
 903         if (skip_prefix(line, "deepen-since ", &arg)) {
 904                 char *end = NULL;
 905                 *deepen_since = parse_timestamp(arg, &end, 0);
 906                 if (!end || *end || !deepen_since ||
 907                     /* revisions.c's max_age -1 is special */
 908                     *deepen_since == -1)
 909                         die("Invalid deepen-since: %s", line);
 910                 *deepen_rev_list = 1;
 911                 return 1;
 912         }
 913         return 0;
 914 }
 915
 916 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 917 {
 918         const char *arg;
 919         if (skip_prefix(line, "deepen-not ", &arg)) {
 920                 char *ref = NULL;
 921                 struct object_id oid;
 922                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 923                         die("git upload-pack: ambiguous deepen-not: %s", line);
 924                 string_list_append(deepen_not, ref);
 925                 free(ref);
 926                 *deepen_rev_list = 1;
 927                 return 1;
 928         }
 929         return 0;
 930 }
 931
 932 static void receive_needs(struct upload_pack_data *data,
 933                           struct packet_reader *reader)
 934 {
 935         int has_non_tip = 0;
 936
 937         data->shallow_nr = 0;
 938         for (;;) {
 939                 struct object *o;
 940                 const char *features;
 941                 struct object_id oid_buf;
 942                 const char *arg;
 943
 944                 reset_timeout(data->timeout);
 945                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 946                         break;
 947
 948                 if (process_shallow(reader->line, &data->shallows))
 949                         continue;
 950                 if (process_deepen(reader->line, &data->depth))
 951                         continue;
 952                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
 953                         continue;
 954                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
 955                         continue;
 956
 957                 if (skip_prefix(reader->line, "filter ", &arg)) {
 958                         if (!data->filter_capability_requested)
 959                                 die("git upload-pack: filtering capability not negotiated");
 960                         list_objects_filter_die_if_populated(&data->filter_options);
 961                         parse_list_objects_filter(&data->filter_options, arg);
 962                         continue;
 963                 }
 964
 965                 if (!skip_prefix(reader->line, "want ", &arg) ||
 966                     parse_oid_hex(arg, &oid_buf, &features))
 967                         die("git upload-pack: protocol error, "
 968                             "expected to get object ID, not '%s'", reader->line);
 969
 970                 if (parse_feature_request(features, "deepen-relative"))
 971                         data->deepen_relative = 1;
 972                 if (parse_feature_request(features, "multi_ack_detailed"))
 973                         data->multi_ack = MULTI_ACK_DETAILED;
 974                 else if (parse_feature_request(features, "multi_ack"))
 975                         data->multi_ack = MULTI_ACK;
 976                 if (parse_feature_request(features, "no-done"))
 977                         data->no_done = 1;
 978                 if (parse_feature_request(features, "thin-pack"))
 979                         data->use_thin_pack = 1;
 980                 if (parse_feature_request(features, "ofs-delta"))
 981                         data->use_ofs_delta = 1;
 982                 if (parse_feature_request(features, "side-band-64k"))
 983                         data->use_sideband = LARGE_PACKET_MAX;
 984                 else if (parse_feature_request(features, "side-band"))
 985                         data->use_sideband = DEFAULT_PACKET_MAX;
 986                 if (parse_feature_request(features, "no-progress"))
 987                         data->no_progress = 1;
 988                 if (parse_feature_request(features, "include-tag"))
 989                         data->use_include_tag = 1;
 990                 if (data->allow_filter &&
 991                     parse_feature_request(features, "filter"))
 992                         data->filter_capability_requested = 1;
 993
 994                 o = parse_object(the_repository, &oid_buf);
 995                 if (!o) {
 996                         packet_writer_error(&data->writer,
 997                                             "upload-pack: not our ref %s",
 998                                             oid_to_hex(&oid_buf));
 999                         die("git upload-pack: not our ref %s",
1000                             oid_to_hex(&oid_buf));
1001                 }
1002                 if (!(o->flags & WANTED)) {
1003                         o->flags |= WANTED;
1004                         if (!((data->allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
1005                               || is_our_ref(o, data->allow_unadvertised_object_request)))
1006                                 has_non_tip = 1;
1007                         add_object_array(o, NULL, &data->want_obj);
1008                 }
1009         }
1010
1011         /*
1012          * We have sent all our refs already, and the other end
1013          * should have chosen out of them. When we are operating
1014          * in the stateless RPC mode, however, their choice may
1015          * have been based on the set of older refs advertised
1016          * by another process that handled the initial request.
1017          */
1018         if (has_non_tip)
1019                 check_non_tip(data);
1020
1021         if (!data->use_sideband && data->daemon_mode)
1022                 data->no_progress = 1;
1023
1024         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1025                 return;
1026
1027         if (send_shallow_list(data))
1028                 packet_flush(1);
1029 }
1030
1031 /* return non-zero if the ref is hidden, otherwise 0 */
1032 static int mark_our_ref(const char *refname, const char *refname_full,
1033                         const struct object_id *oid)
1034 {
1035         struct object *o = lookup_unknown_object(oid);
1036
1037         if (ref_is_hidden(refname, refname_full)) {
1038                 o->flags |= HIDDEN_REF;
1039                 return 1;
1040         }
1041         o->flags |= OUR_REF;
1042         return 0;
1043 }
1044
1045 static int check_ref(const char *refname_full, const struct object_id *oid,
1046                      int flag, void *cb_data)
1047 {
1048         const char *refname = strip_namespace(refname_full);
1049
1050         mark_our_ref(refname, refname_full, oid);
1051         return 0;
1052 }
1053
1054 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1055 {
1056         struct string_list_item *item;
1057
1058         if (!symref->nr)
1059                 return;
1060         for_each_string_list_item(item, symref)
1061                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1062 }
1063
1064 static int send_ref(const char *refname, const struct object_id *oid,
1065                     int flag, void *cb_data)
1066 {
1067         static const char *capabilities = "multi_ack thin-pack side-band"
1068                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1069                 " deepen-relative no-progress include-tag multi_ack_detailed";
1070         const char *refname_nons = strip_namespace(refname);
1071         struct object_id peeled;
1072         struct upload_pack_data *data = cb_data;
1073
1074         if (mark_our_ref(refname_nons, refname, oid))
1075                 return 0;
1076
1077         if (capabilities) {
1078                 struct strbuf symref_info = STRBUF_INIT;
1079
1080                 format_symref_info(&symref_info, &data->symref);
1081                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1082                              oid_to_hex(oid), refname_nons,
1083                              0, capabilities,
1084                              (data->allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1085                                      " allow-tip-sha1-in-want" : "",
1086                              (data->allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1087                                      " allow-reachable-sha1-in-want" : "",
1088                              data->stateless_rpc ? " no-done" : "",
1089                              symref_info.buf,
1090                              data->allow_filter ? " filter" : "",
1091                              git_user_agent_sanitized());
1092                 strbuf_release(&symref_info);
1093         } else {
1094                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1095         }
1096         capabilities = NULL;
1097         if (!peel_ref(refname, &peeled))
1098                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1099         return 0;
1100 }
1101
1102 static int find_symref(const char *refname, const struct object_id *oid,
1103                        int flag, void *cb_data)
1104 {
1105         const char *symref_target;
1106         struct string_list_item *item;
1107
1108         if ((flag & REF_ISSYMREF) == 0)
1109                 return 0;
1110         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1111         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1112                 die("'%s' is a symref but it is not?", refname);
1113         item = string_list_append(cb_data, strip_namespace(refname));
1114         item->util = xstrdup(strip_namespace(symref_target));
1115         return 0;
1116 }
1117
1118 static int upload_pack_config(const char *var, const char *value, void *cb_data)
1119 {
1120         struct upload_pack_data *data = cb_data;
1121
1122         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1123                 if (git_config_bool(var, value))
1124                         data->allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1125                 else
1126                         data->allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1127         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1128                 if (git_config_bool(var, value))
1129                         data->allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1130                 else
1131                         data->allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1132         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1133                 if (git_config_bool(var, value))
1134                         data->allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1135                 else
1136                         data->allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1137         } else if (!strcmp("uploadpack.keepalive", var)) {
1138                 data->keepalive = git_config_int(var, value);
1139                 if (!data->keepalive)
1140                         data->keepalive = -1;
1141         } else if (!strcmp("uploadpack.allowfilter", var)) {
1142                 data->allow_filter = git_config_bool(var, value);
1143         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1144                 data->allow_ref_in_want = git_config_bool(var, value);
1145         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1146                 data->allow_sideband_all = git_config_bool(var, value);
1147         } else if (!strcmp("core.precomposeunicode", var)) {
1148                 precomposed_unicode = git_config_bool(var, value);
1149         }
1150
1151         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1152         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1153                 if (!strcmp("uploadpack.packobjectshook", var))
1154                         return git_config_string(&data->pack_objects_hook, var, value);
1155         }
1156
1157         return parse_hide_refs_config(var, value, "uploadpack");
1158 }
1159
1160 void upload_pack(struct upload_pack_options *options)
1161 {
1162         struct packet_reader reader;
1163         struct upload_pack_data data;
1164
1165         upload_pack_data_init(&data);
1166
1167         git_config(upload_pack_config, &data);
1168
1169         data.stateless_rpc = options->stateless_rpc;
1170         data.daemon_mode = options->daemon_mode;
1171         data.timeout = options->timeout;
1172
1173         head_ref_namespaced(find_symref, &data.symref);
1174
1175         if (options->advertise_refs || !data.stateless_rpc) {
1176                 reset_timeout(data.timeout);
1177                 head_ref_namespaced(send_ref, &data);
1178                 for_each_namespaced_ref(send_ref, &data);
1179                 advertise_shallow_grafts(1);
1180                 packet_flush(1);
1181         } else {
1182                 head_ref_namespaced(check_ref, NULL);
1183                 for_each_namespaced_ref(check_ref, NULL);
1184         }
1185
1186         if (!options->advertise_refs) {
1187                 packet_reader_init(&reader, 0, NULL, 0,
1188                                    PACKET_READ_CHOMP_NEWLINE |
1189                                    PACKET_READ_DIE_ON_ERR_PACKET);
1190
1191                 receive_needs(&data, &reader);
1192                 if (data.want_obj.nr) {
1193                         get_common_commits(&data, &reader);
1194                         create_pack_file(&data);
1195                 }
1196         }
1197
1198         upload_pack_data_clear(&data);
1199 }
1200
1201 static int parse_want(struct packet_writer *writer, const char *line,
1202                       struct object_array *want_obj)
1203 {
1204         const char *arg;
1205         if (skip_prefix(line, "want ", &arg)) {
1206                 struct object_id oid;
1207                 struct object *o;
1208
1209                 if (get_oid_hex(arg, &oid))
1210                         die("git upload-pack: protocol error, "
1211                             "expected to get oid, not '%s'", line);
1212
1213                 o = parse_object(the_repository, &oid);
1214                 if (!o) {
1215                         packet_writer_error(writer,
1216                                             "upload-pack: not our ref %s",
1217                                             oid_to_hex(&oid));
1218                         die("git upload-pack: not our ref %s",
1219                             oid_to_hex(&oid));
1220                 }
1221
1222                 if (!(o->flags & WANTED)) {
1223                         o->flags |= WANTED;
1224                         add_object_array(o, NULL, want_obj);
1225                 }
1226
1227                 return 1;
1228         }
1229
1230         return 0;
1231 }
1232
1233 static int parse_want_ref(struct packet_writer *writer, const char *line,
1234                           struct string_list *wanted_refs,
1235                           struct object_array *want_obj)
1236 {
1237         const char *arg;
1238         if (skip_prefix(line, "want-ref ", &arg)) {
1239                 struct object_id oid;
1240                 struct string_list_item *item;
1241                 struct object *o;
1242
1243                 if (read_ref(arg, &oid)) {
1244                         packet_writer_error(writer, "unknown ref %s", arg);
1245                         die("unknown ref %s", arg);
1246                 }
1247
1248                 item = string_list_append(wanted_refs, arg);
1249                 item->util = oiddup(&oid);
1250
1251                 o = parse_object_or_die(&oid, arg);
1252                 if (!(o->flags & WANTED)) {
1253                         o->flags |= WANTED;
1254                         add_object_array(o, NULL, want_obj);
1255                 }
1256
1257                 return 1;
1258         }
1259
1260         return 0;
1261 }
1262
1263 static int parse_have(const char *line, struct oid_array *haves)
1264 {
1265         const char *arg;
1266         if (skip_prefix(line, "have ", &arg)) {
1267                 struct object_id oid;
1268
1269                 if (get_oid_hex(arg, &oid))
1270                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1271                 oid_array_append(haves, &oid);
1272                 return 1;
1273         }
1274
1275         return 0;
1276 }
1277
1278 static void process_args(struct packet_reader *request,
1279                          struct upload_pack_data *data)
1280 {
1281         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1282                 const char *arg = request->line;
1283                 const char *p;
1284
1285                 /* process want */
1286                 if (parse_want(&data->writer, arg, &data->want_obj))
1287                         continue;
1288                 if (data->allow_ref_in_want &&
1289                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1290                                    &data->want_obj))
1291                         continue;
1292                 /* process have line */
1293                 if (parse_have(arg, &data->haves))
1294                         continue;
1295
1296                 /* process args like thin-pack */
1297                 if (!strcmp(arg, "thin-pack")) {
1298                         data->use_thin_pack = 1;
1299                         continue;
1300                 }
1301                 if (!strcmp(arg, "ofs-delta")) {
1302                         data->use_ofs_delta = 1;
1303                         continue;
1304                 }
1305                 if (!strcmp(arg, "no-progress")) {
1306                         data->no_progress = 1;
1307                         continue;
1308                 }
1309                 if (!strcmp(arg, "include-tag")) {
1310                         data->use_include_tag = 1;
1311                         continue;
1312                 }
1313                 if (!strcmp(arg, "done")) {
1314                         data->done = 1;
1315                         continue;
1316                 }
1317
1318                 /* Shallow related arguments */
1319                 if (process_shallow(arg, &data->shallows))
1320                         continue;
1321                 if (process_deepen(arg, &data->depth))
1322                         continue;
1323                 if (process_deepen_since(arg, &data->deepen_since,
1324                                          &data->deepen_rev_list))
1325                         continue;
1326                 if (process_deepen_not(arg, &data->deepen_not,
1327                                        &data->deepen_rev_list))
1328                         continue;
1329                 if (!strcmp(arg, "deepen-relative")) {
1330                         data->deepen_relative = 1;
1331                         continue;
1332                 }
1333
1334                 if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
1335                         list_objects_filter_die_if_populated(&data->filter_options);
1336                         parse_list_objects_filter(&data->filter_options, p);
1337                         continue;
1338                 }
1339
1340                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1341                      data->allow_sideband_all) &&
1342                     !strcmp(arg, "sideband-all")) {
1343                         data->writer.use_sideband = 1;
1344                         continue;
1345                 }
1346
1347                 /* ignore unknown lines maybe? */
1348                 die("unexpected line: '%s'", arg);
1349         }
1350
1351         if (request->status != PACKET_READ_FLUSH)
1352                 die(_("expected flush after fetch arguments"));
1353 }
1354
1355 static int process_haves(struct oid_array *haves, struct oid_array *common,
1356                          struct object_array *have_obj)
1357 {
1358         int i;
1359
1360         /* Process haves */
1361         for (i = 0; i < haves->nr; i++) {
1362                 const struct object_id *oid = &haves->oid[i];
1363                 struct object *o;
1364                 int we_knew_they_have = 0;
1365
1366                 if (!has_object_file(oid))
1367                         continue;
1368
1369                 oid_array_append(common, oid);
1370
1371                 o = parse_object(the_repository, oid);
1372                 if (!o)
1373                         die("oops (%s)", oid_to_hex(oid));
1374                 if (o->type == OBJ_COMMIT) {
1375                         struct commit_list *parents;
1376                         struct commit *commit = (struct commit *)o;
1377                         if (o->flags & THEY_HAVE)
1378                                 we_knew_they_have = 1;
1379                         else
1380                                 o->flags |= THEY_HAVE;
1381                         if (!oldest_have || (commit->date < oldest_have))
1382                                 oldest_have = commit->date;
1383                         for (parents = commit->parents;
1384                              parents;
1385                              parents = parents->next)
1386                                 parents->item->object.flags |= THEY_HAVE;
1387                 }
1388                 if (!we_knew_they_have)
1389                         add_object_array(o, NULL, have_obj);
1390         }
1391
1392         return 0;
1393 }
1394
1395 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1396                      const struct object_array *have_obj,
1397                      struct object_array *want_obj)
1398 {
1399         int i;
1400
1401         packet_writer_write(writer, "acknowledgments\n");
1402
1403         /* Send Acks */
1404         if (!acks->nr)
1405                 packet_writer_write(writer, "NAK\n");
1406
1407         for (i = 0; i < acks->nr; i++) {
1408                 packet_writer_write(writer, "ACK %s\n",
1409                                     oid_to_hex(&acks->oid[i]));
1410         }
1411
1412         if (ok_to_give_up(have_obj, want_obj)) {
1413                 /* Send Ready */
1414                 packet_writer_write(writer, "ready\n");
1415                 return 1;
1416         }
1417
1418         return 0;
1419 }
1420
1421 static int process_haves_and_send_acks(struct upload_pack_data *data)
1422 {
1423         struct oid_array common = OID_ARRAY_INIT;
1424         int ret = 0;
1425
1426         process_haves(&data->haves, &common, &data->have_obj);
1427         if (data->done) {
1428                 ret = 1;
1429         } else if (send_acks(&data->writer, &common,
1430                              &data->have_obj, &data->want_obj)) {
1431                 packet_writer_delim(&data->writer);
1432                 ret = 1;
1433         } else {
1434                 /* Add Flush */
1435                 packet_writer_flush(&data->writer);
1436                 ret = 0;
1437         }
1438
1439         oid_array_clear(&data->haves);
1440         oid_array_clear(&common);
1441         return ret;
1442 }
1443
1444 static void send_wanted_ref_info(struct upload_pack_data *data)
1445 {
1446         const struct string_list_item *item;
1447
1448         if (!data->wanted_refs.nr)
1449                 return;
1450
1451         packet_writer_write(&data->writer, "wanted-refs\n");
1452
1453         for_each_string_list_item(item, &data->wanted_refs) {
1454                 packet_writer_write(&data->writer, "%s %s\n",
1455                                     oid_to_hex(item->util),
1456                                     item->string);
1457         }
1458
1459         packet_writer_delim(&data->writer);
1460 }
1461
1462 static void send_shallow_info(struct upload_pack_data *data)
1463 {
1464         /* No shallow info needs to be sent */
1465         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1466             !is_repository_shallow(the_repository))
1467                 return;
1468
1469         packet_writer_write(&data->writer, "shallow-info\n");
1470
1471         if (!send_shallow_list(data) &&
1472             is_repository_shallow(the_repository))
1473                 deepen(data, INFINITE_DEPTH);
1474
1475         packet_delim(1);
1476 }
1477
1478 enum fetch_state {
1479         FETCH_PROCESS_ARGS = 0,
1480         FETCH_SEND_ACKS,
1481         FETCH_SEND_PACK,
1482         FETCH_DONE,
1483 };
1484
1485 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1486                    struct packet_reader *request)
1487 {
1488         enum fetch_state state = FETCH_PROCESS_ARGS;
1489         struct upload_pack_data data;
1490
1491         clear_object_flags(ALL_FLAGS);
1492
1493         upload_pack_data_init(&data);
1494         data.use_sideband = LARGE_PACKET_MAX;
1495
1496         git_config(upload_pack_config, &data);
1497
1498         while (state != FETCH_DONE) {
1499                 switch (state) {
1500                 case FETCH_PROCESS_ARGS:
1501                         process_args(request, &data);
1502
1503                         if (!data.want_obj.nr) {
1504                                 /*
1505                                  * Request didn't contain any 'want' lines,
1506                                  * guess they didn't want anything.
1507                                  */
1508                                 state = FETCH_DONE;
1509                         } else if (data.haves.nr) {
1510                                 /*
1511                                  * Request had 'have' lines, so lets ACK them.
1512                                  */
1513                                 state = FETCH_SEND_ACKS;
1514                         } else {
1515                                 /*
1516                                  * Request had 'want's but no 'have's so we can
1517                                  * immedietly go to construct and send a pack.
1518                                  */
1519                                 state = FETCH_SEND_PACK;
1520                         }
1521                         break;
1522                 case FETCH_SEND_ACKS:
1523                         if (process_haves_and_send_acks(&data))
1524                                 state = FETCH_SEND_PACK;
1525                         else
1526                                 state = FETCH_DONE;
1527                         break;
1528                 case FETCH_SEND_PACK:
1529                         send_wanted_ref_info(&data);
1530                         send_shallow_info(&data);
1531
1532                         packet_writer_write(&data.writer, "packfile\n");
1533                         create_pack_file(&data);
1534                         state = FETCH_DONE;
1535                         break;
1536                 case FETCH_DONE:
1537                         continue;
1538                 }
1539         }
1540
1541         upload_pack_data_clear(&data);
1542         return 0;
1543 }
1544
1545 int upload_pack_advertise(struct repository *r,
1546                           struct strbuf *value)
1547 {
1548         if (value) {
1549                 int allow_filter_value;
1550                 int allow_ref_in_want;
1551                 int allow_sideband_all_value;
1552
1553                 strbuf_addstr(value, "shallow");
1554
1555                 if (!repo_config_get_bool(the_repository,
1556                                          "uploadpack.allowfilter",
1557                                          &allow_filter_value) &&
1558                     allow_filter_value)
1559                         strbuf_addstr(value, " filter");
1560
1561                 if (!repo_config_get_bool(the_repository,
1562                                          "uploadpack.allowrefinwant",
1563                                          &allow_ref_in_want) &&
1564                     allow_ref_in_want)
1565                         strbuf_addstr(value, " ref-in-want");
1566
1567                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1568                     (!repo_config_get_bool(the_repository,
1569                                            "uploadpack.allowsidebandall",
1570                                            &allow_sideband_all_value) &&
1571                      allow_sideband_all_value))
1572                         strbuf_addstr(value, " sideband-all");
1573         }
1574
1575         return 1;
1576 }