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 /* Allow specifying sha1 if it is a ref tip. */
  48 #define ALLOW_TIP_SHA1  01
  49 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  50 #define ALLOW_REACHABLE_SHA1    02
  51 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  52 #define ALLOW_ANY_SHA1  07
  53 static unsigned int allow_unadvertised_object_request;
  54 static int shallow_nr;
  55 static struct object_array extra_edge_obj;
  56 static int keepalive = 5;
  57 static const char *pack_objects_hook;
  58
  59 static int allow_filter;
  60 static int allow_ref_in_want;
  61
  62 static int allow_sideband_all;
  63
  64 /*
  65  * Please annotate, and if possible group together, fields used only
  66  * for protocol v0 or only for protocol v2.
  67  */
  68 struct upload_pack_data {
  69         struct string_list symref;                              /* v0 only */
  70         struct object_array want_obj;
  71         struct object_array have_obj;
  72         struct oid_array haves;                                 /* v2 only */
  73         struct string_list wanted_refs;                         /* v2 only */
  74
  75         struct object_array shallows;
  76         struct string_list deepen_not;
  77         int depth;
  78         timestamp_t deepen_since;
  79         int deepen_rev_list;
  80         int deepen_relative;
  81
  82         unsigned int timeout;                                   /* v0 only */
  83         enum {
  84                 NO_MULTI_ACK = 0,
  85                 MULTI_ACK = 1,
  86                 MULTI_ACK_DETAILED = 2
  87         } multi_ack;                                            /* v0 only */
  88
  89         /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
  90         int use_sideband;
  91
  92         struct list_objects_filter_options filter_options;
  93
  94         struct packet_writer writer;
  95
  96         unsigned stateless_rpc : 1;                             /* v0 only */
  97         unsigned no_done : 1;                                   /* v0 only */
  98         unsigned daemon_mode : 1;                               /* v0 only */
  99         unsigned filter_capability_requested : 1;               /* v0 only */
 100
 101         unsigned use_thin_pack : 1;
 102         unsigned use_ofs_delta : 1;
 103         unsigned no_progress : 1;
 104         unsigned use_include_tag : 1;
 105
 106         unsigned done : 1;                                      /* v2 only */
 107 };
 108
 109 static void upload_pack_data_init(struct upload_pack_data *data)
 110 {
 111         struct string_list symref = STRING_LIST_INIT_DUP;
 112         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 113         struct object_array want_obj = OBJECT_ARRAY_INIT;
 114         struct object_array have_obj = OBJECT_ARRAY_INIT;
 115         struct oid_array haves = OID_ARRAY_INIT;
 116         struct object_array shallows = OBJECT_ARRAY_INIT;
 117         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 118
 119         memset(data, 0, sizeof(*data));
 120         data->symref = symref;
 121         data->wanted_refs = wanted_refs;
 122         data->want_obj = want_obj;
 123         data->have_obj = have_obj;
 124         data->haves = haves;
 125         data->shallows = shallows;
 126         data->deepen_not = deepen_not;
 127         packet_writer_init(&data->writer, 1);
 128 }
 129
 130 static void upload_pack_data_clear(struct upload_pack_data *data)
 131 {
 132         string_list_clear(&data->symref, 1);
 133         string_list_clear(&data->wanted_refs, 1);
 134         object_array_clear(&data->want_obj);
 135         object_array_clear(&data->have_obj);
 136         oid_array_clear(&data->haves);
 137         object_array_clear(&data->shallows);
 138         string_list_clear(&data->deepen_not, 0);
 139         list_objects_filter_release(&data->filter_options);
 140 }
 141
 142 static void reset_timeout(unsigned int timeout)
 143 {
 144         alarm(timeout);
 145 }
 146
 147 static void send_client_data(int fd, const char *data, ssize_t sz,
 148                              int use_sideband)
 149 {
 150         if (use_sideband) {
 151                 send_sideband(1, fd, data, sz, use_sideband);
 152                 return;
 153         }
 154         if (fd == 3)
 155                 /* emergency quit */
 156                 fd = 2;
 157         if (fd == 2) {
 158                 /* XXX: are we happy to lose stuff here? */
 159                 xwrite(fd, data, sz);
 160                 return;
 161         }
 162         write_or_die(fd, data, sz);
 163 }
 164
 165 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 166 {
 167         FILE *fp = cb_data;
 168         if (graft->nr_parent == -1)
 169                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 170         return 0;
 171 }
 172
 173 static void create_pack_file(struct upload_pack_data *pack_data)
 174 {
 175         struct child_process pack_objects = CHILD_PROCESS_INIT;
 176         char data[8193], progress[128];
 177         char abort_msg[] = "aborting due to possible repository "
 178                 "corruption on the remote side.";
 179         int buffered = -1;
 180         ssize_t sz;
 181         int i;
 182         FILE *pipe_fd;
 183
 184         if (!pack_objects_hook)
 185                 pack_objects.git_cmd = 1;
 186         else {
 187                 argv_array_push(&pack_objects.args, pack_objects_hook);
 188                 argv_array_push(&pack_objects.args, "git");
 189                 pack_objects.use_shell = 1;
 190         }
 191
 192         if (shallow_nr) {
 193                 argv_array_push(&pack_objects.args, "--shallow-file");
 194                 argv_array_push(&pack_objects.args, "");
 195         }
 196         argv_array_push(&pack_objects.args, "pack-objects");
 197         argv_array_push(&pack_objects.args, "--revs");
 198         if (pack_data->use_thin_pack)
 199                 argv_array_push(&pack_objects.args, "--thin");
 200
 201         argv_array_push(&pack_objects.args, "--stdout");
 202         if (shallow_nr)
 203                 argv_array_push(&pack_objects.args, "--shallow");
 204         if (!pack_data->no_progress)
 205                 argv_array_push(&pack_objects.args, "--progress");
 206         if (pack_data->use_ofs_delta)
 207                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 208         if (pack_data->use_include_tag)
 209                 argv_array_push(&pack_objects.args, "--include-tag");
 210         if (pack_data->filter_options.choice) {
 211                 const char *spec =
 212                         expand_list_objects_filter_spec(&pack_data->filter_options);
 213                 if (pack_objects.use_shell) {
 214                         struct strbuf buf = STRBUF_INIT;
 215                         sq_quote_buf(&buf, spec);
 216                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 217                         strbuf_release(&buf);
 218                 } else {
 219                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 220                                          spec);
 221                 }
 222         }
 223
 224         pack_objects.in = -1;
 225         pack_objects.out = -1;
 226         pack_objects.err = -1;
 227
 228         if (start_command(&pack_objects))
 229                 die("git upload-pack: unable to fork git-pack-objects");
 230
 231         pipe_fd = xfdopen(pack_objects.in, "w");
 232
 233         if (shallow_nr)
 234                 for_each_commit_graft(write_one_shallow, pipe_fd);
 235
 236         for (i = 0; i < pack_data->want_obj.nr; i++)
 237                 fprintf(pipe_fd, "%s\n",
 238                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 239         fprintf(pipe_fd, "--not\n");
 240         for (i = 0; i < pack_data->have_obj.nr; i++)
 241                 fprintf(pipe_fd, "%s\n",
 242                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 243         for (i = 0; i < extra_edge_obj.nr; i++)
 244                 fprintf(pipe_fd, "%s\n",
 245                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 246         fprintf(pipe_fd, "\n");
 247         fflush(pipe_fd);
 248         fclose(pipe_fd);
 249
 250         /* We read from pack_objects.err to capture stderr output for
 251          * progress bar, and pack_objects.out to capture the pack data.
 252          */
 253
 254         while (1) {
 255                 struct pollfd pfd[2];
 256                 int pe, pu, pollsize;
 257                 int ret;
 258
 259                 reset_timeout(pack_data->timeout);
 260
 261                 pollsize = 0;
 262                 pe = pu = -1;
 263
 264                 if (0 <= pack_objects.out) {
 265                         pfd[pollsize].fd = pack_objects.out;
 266                         pfd[pollsize].events = POLLIN;
 267                         pu = pollsize;
 268                         pollsize++;
 269                 }
 270                 if (0 <= pack_objects.err) {
 271                         pfd[pollsize].fd = pack_objects.err;
 272                         pfd[pollsize].events = POLLIN;
 273                         pe = pollsize;
 274                         pollsize++;
 275                 }
 276
 277                 if (!pollsize)
 278                         break;
 279
 280                 ret = poll(pfd, pollsize,
 281                         keepalive < 0 ? -1 : 1000 * keepalive);
 282
 283                 if (ret < 0) {
 284                         if (errno != EINTR) {
 285                                 error_errno("poll failed, resuming");
 286                                 sleep(1);
 287                         }
 288                         continue;
 289                 }
 290                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 291                         /* Status ready; we ship that in the side-band
 292                          * or dump to the standard error.
 293                          */
 294                         sz = xread(pack_objects.err, progress,
 295                                   sizeof(progress));
 296                         if (0 < sz)
 297                                 send_client_data(2, progress, sz,
 298                                                  pack_data->use_sideband);
 299                         else if (sz == 0) {
 300                                 close(pack_objects.err);
 301                                 pack_objects.err = -1;
 302                         }
 303                         else
 304                                 goto fail;
 305                         /* give priority to status messages */
 306                         continue;
 307                 }
 308                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 309                         /* Data ready; we keep the last byte to ourselves
 310                          * in case we detect broken rev-list, so that we
 311                          * can leave the stream corrupted.  This is
 312                          * unfortunate -- unpack-objects would happily
 313                          * accept a valid packdata with trailing garbage,
 314                          * so appending garbage after we pass all the
 315                          * pack data is not good enough to signal
 316                          * breakage to downstream.
 317                          */
 318                         char *cp = data;
 319                         ssize_t outsz = 0;
 320                         if (0 <= buffered) {
 321                                 *cp++ = buffered;
 322                                 outsz++;
 323                         }
 324                         sz = xread(pack_objects.out, cp,
 325                                   sizeof(data) - outsz);
 326                         if (0 < sz)
 327                                 ;
 328                         else if (sz == 0) {
 329                                 close(pack_objects.out);
 330                                 pack_objects.out = -1;
 331                         }
 332                         else
 333                                 goto fail;
 334                         sz += outsz;
 335                         if (1 < sz) {
 336                                 buffered = data[sz-1] & 0xFF;
 337                                 sz--;
 338                         }
 339                         else
 340                                 buffered = -1;
 341                         send_client_data(1, data, sz,
 342                                          pack_data->use_sideband);
 343                 }
 344
 345                 /*
 346                  * We hit the keepalive timeout without saying anything; send
 347                  * an empty message on the data sideband just to let the other
 348                  * side know we're still working on it, but don't have any data
 349                  * yet.
 350                  *
 351                  * If we don't have a sideband channel, there's no room in the
 352                  * protocol to say anything, so those clients are just out of
 353                  * luck.
 354                  */
 355                 if (!ret && pack_data->use_sideband) {
 356                         static const char buf[] = "0005\1";
 357                         write_or_die(1, buf, 5);
 358                 }
 359         }
 360
 361         if (finish_command(&pack_objects)) {
 362                 error("git upload-pack: git-pack-objects died with error.");
 363                 goto fail;
 364         }
 365
 366         /* flush the data */
 367         if (0 <= buffered) {
 368                 data[0] = buffered;
 369                 send_client_data(1, data, 1,
 370                                  pack_data->use_sideband);
 371                 fprintf(stderr, "flushed.\n");
 372         }
 373         if (pack_data->use_sideband)
 374                 packet_flush(1);
 375         return;
 376
 377  fail:
 378         send_client_data(3, abort_msg, sizeof(abort_msg),
 379                          pack_data->use_sideband);
 380         die("git upload-pack: %s", abort_msg);
 381 }
 382
 383 static int got_oid(const char *hex, struct object_id *oid,
 384                    struct object_array *have_obj)
 385 {
 386         struct object *o;
 387         int we_knew_they_have = 0;
 388
 389         if (get_oid_hex(hex, oid))
 390                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 391         if (!has_object_file(oid))
 392                 return -1;
 393
 394         o = parse_object(the_repository, oid);
 395         if (!o)
 396                 die("oops (%s)", oid_to_hex(oid));
 397         if (o->type == OBJ_COMMIT) {
 398                 struct commit_list *parents;
 399                 struct commit *commit = (struct commit *)o;
 400                 if (o->flags & THEY_HAVE)
 401                         we_knew_they_have = 1;
 402                 else
 403                         o->flags |= THEY_HAVE;
 404                 if (!oldest_have || (commit->date < oldest_have))
 405                         oldest_have = commit->date;
 406                 for (parents = commit->parents;
 407                      parents;
 408                      parents = parents->next)
 409                         parents->item->object.flags |= THEY_HAVE;
 410         }
 411         if (!we_knew_they_have) {
 412                 add_object_array(o, NULL, have_obj);
 413                 return 1;
 414         }
 415         return 0;
 416 }
 417
 418 static int ok_to_give_up(const struct object_array *have_obj,
 419                          struct object_array *want_obj)
 420 {
 421         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 422
 423         if (!have_obj->nr)
 424                 return 0;
 425
 426         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 427                                             COMMON_KNOWN, oldest_have,
 428                                             min_generation);
 429 }
 430
 431 static int get_common_commits(struct upload_pack_data *data,
 432                               struct packet_reader *reader)
 433 {
 434         struct object_id oid;
 435         char last_hex[GIT_MAX_HEXSZ + 1];
 436         int got_common = 0;
 437         int got_other = 0;
 438         int sent_ready = 0;
 439
 440         save_commit_buffer = 0;
 441
 442         for (;;) {
 443                 const char *arg;
 444
 445                 reset_timeout(data->timeout);
 446
 447                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 448                         if (data->multi_ack == MULTI_ACK_DETAILED
 449                             && got_common
 450                             && !got_other
 451                             && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 452                                 sent_ready = 1;
 453                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 454                         }
 455                         if (data->have_obj.nr == 0 || data->multi_ack)
 456                                 packet_write_fmt(1, "NAK\n");
 457
 458                         if (data->no_done && sent_ready) {
 459                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 460                                 return 0;
 461                         }
 462                         if (data->stateless_rpc)
 463                                 exit(0);
 464                         got_common = 0;
 465                         got_other = 0;
 466                         continue;
 467                 }
 468                 if (skip_prefix(reader->line, "have ", &arg)) {
 469                         switch (got_oid(arg, &oid, &data->have_obj)) {
 470                         case -1: /* they have what we do not */
 471                                 got_other = 1;
 472                                 if (data->multi_ack
 473                                     && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 474                                         const char *hex = oid_to_hex(&oid);
 475                                         if (data->multi_ack == MULTI_ACK_DETAILED) {
 476                                                 sent_ready = 1;
 477                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 478                                         } else
 479                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 480                                 }
 481                                 break;
 482                         default:
 483                                 got_common = 1;
 484                                 oid_to_hex_r(last_hex, &oid);
 485                                 if (data->multi_ack == MULTI_ACK_DETAILED)
 486                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 487                                 else if (data->multi_ack)
 488                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 489                                 else if (data->have_obj.nr == 1)
 490                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 491                                 break;
 492                         }
 493                         continue;
 494                 }
 495                 if (!strcmp(reader->line, "done")) {
 496                         if (data->have_obj.nr > 0) {
 497                                 if (data->multi_ack)
 498                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 499                                 return 0;
 500                         }
 501                         packet_write_fmt(1, "NAK\n");
 502                         return -1;
 503                 }
 504                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 505         }
 506 }
 507
 508 static int is_our_ref(struct object *o)
 509 {
 510         int allow_hidden_ref = (allow_unadvertised_object_request &
 511                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 512         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 513 }
 514
 515 /*
 516  * on successful case, it's up to the caller to close cmd->out
 517  */
 518 static int do_reachable_revlist(struct child_process *cmd,
 519                                 struct object_array *src,
 520                                 struct object_array *reachable)
 521 {
 522         static const char *argv[] = {
 523                 "rev-list", "--stdin", NULL,
 524         };
 525         struct object *o;
 526         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 527         int i;
 528         const unsigned hexsz = the_hash_algo->hexsz;
 529
 530         cmd->argv = argv;
 531         cmd->git_cmd = 1;
 532         cmd->no_stderr = 1;
 533         cmd->in = -1;
 534         cmd->out = -1;
 535
 536         /*
 537          * If the next rev-list --stdin encounters an unknown commit,
 538          * it terminates, which will cause SIGPIPE in the write loop
 539          * below.
 540          */
 541         sigchain_push(SIGPIPE, SIG_IGN);
 542
 543         if (start_command(cmd))
 544                 goto error;
 545
 546         namebuf[0] = '^';
 547         namebuf[hexsz + 1] = '\n';
 548         for (i = get_max_object_index(); 0 < i; ) {
 549                 o = get_indexed_object(--i);
 550                 if (!o)
 551                         continue;
 552                 if (reachable && o->type == OBJ_COMMIT)
 553                         o->flags &= ~TMP_MARK;
 554                 if (!is_our_ref(o))
 555                         continue;
 556                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 557                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 558                         goto error;
 559         }
 560         namebuf[hexsz] = '\n';
 561         for (i = 0; i < src->nr; i++) {
 562                 o = src->objects[i].item;
 563                 if (is_our_ref(o)) {
 564                         if (reachable)
 565                                 add_object_array(o, NULL, reachable);
 566                         continue;
 567                 }
 568                 if (reachable && o->type == OBJ_COMMIT)
 569                         o->flags |= TMP_MARK;
 570                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 571                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 572                         goto error;
 573         }
 574         close(cmd->in);
 575         cmd->in = -1;
 576         sigchain_pop(SIGPIPE);
 577
 578         return 0;
 579
 580 error:
 581         sigchain_pop(SIGPIPE);
 582
 583         if (cmd->in >= 0)
 584                 close(cmd->in);
 585         if (cmd->out >= 0)
 586                 close(cmd->out);
 587         return -1;
 588 }
 589
 590 static int get_reachable_list(struct object_array *src,
 591                               struct object_array *reachable)
 592 {
 593         struct child_process cmd = CHILD_PROCESS_INIT;
 594         int i;
 595         struct object *o;
 596         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 597         const unsigned hexsz = the_hash_algo->hexsz;
 598
 599         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 600                 return -1;
 601
 602         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 603                 struct object_id oid;
 604                 const char *p;
 605
 606                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 607                         break;
 608
 609                 o = lookup_object(the_repository, &oid);
 610                 if (o && o->type == OBJ_COMMIT) {
 611                         o->flags &= ~TMP_MARK;
 612                 }
 613         }
 614         for (i = get_max_object_index(); 0 < i; i--) {
 615                 o = get_indexed_object(i - 1);
 616                 if (o && o->type == OBJ_COMMIT &&
 617                     (o->flags & TMP_MARK)) {
 618                         add_object_array(o, NULL, reachable);
 619                                 o->flags &= ~TMP_MARK;
 620                 }
 621         }
 622         close(cmd.out);
 623
 624         if (finish_command(&cmd))
 625                 return -1;
 626
 627         return 0;
 628 }
 629
 630 static int has_unreachable(struct object_array *src)
 631 {
 632         struct child_process cmd = CHILD_PROCESS_INIT;
 633         char buf[1];
 634         int i;
 635
 636         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 637                 return 1;
 638
 639         /*
 640          * The commits out of the rev-list are not ancestors of
 641          * our ref.
 642          */
 643         i = read_in_full(cmd.out, buf, 1);
 644         if (i)
 645                 goto error;
 646         close(cmd.out);
 647         cmd.out = -1;
 648
 649         /*
 650          * rev-list may have died by encountering a bad commit
 651          * in the history, in which case we do want to bail out
 652          * even when it showed no commit.
 653          */
 654         if (finish_command(&cmd))
 655                 goto error;
 656
 657         /* All the non-tip ones are ancestors of what we advertised */
 658         return 0;
 659
 660 error:
 661         sigchain_pop(SIGPIPE);
 662         if (cmd.out >= 0)
 663                 close(cmd.out);
 664         return 1;
 665 }
 666
 667 static void check_non_tip(struct upload_pack_data *data)
 668 {
 669         int i;
 670
 671         /*
 672          * In the normal in-process case without
 673          * uploadpack.allowReachableSHA1InWant,
 674          * non-tip requests can never happen.
 675          */
 676         if (!data->stateless_rpc
 677             && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 678                 goto error;
 679         if (!has_unreachable(&data->want_obj))
 680                 /* All the non-tip ones are ancestors of what we advertised */
 681                 return;
 682
 683 error:
 684         /* Pick one of them (we know there at least is one) */
 685         for (i = 0; i < data->want_obj.nr; i++) {
 686                 struct object *o = data->want_obj.objects[i].item;
 687                 if (!is_our_ref(o)) {
 688                         packet_writer_error(&data->writer,
 689                                             "upload-pack: not our ref %s",
 690                                             oid_to_hex(&o->oid));
 691                         die("git upload-pack: not our ref %s",
 692                             oid_to_hex(&o->oid));
 693                 }
 694         }
 695 }
 696
 697 static void send_shallow(struct packet_writer *writer,
 698                          struct commit_list *result)
 699 {
 700         while (result) {
 701                 struct object *object = &result->item->object;
 702                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 703                         packet_writer_write(writer, "shallow %s",
 704                                             oid_to_hex(&object->oid));
 705                         register_shallow(the_repository, &object->oid);
 706                         shallow_nr++;
 707                 }
 708                 result = result->next;
 709         }
 710 }
 711
 712 static void send_unshallow(struct packet_writer *writer,
 713                            const struct object_array *shallows,
 714                            struct object_array *want_obj)
 715 {
 716         int i;
 717
 718         for (i = 0; i < shallows->nr; i++) {
 719                 struct object *object = shallows->objects[i].item;
 720                 if (object->flags & NOT_SHALLOW) {
 721                         struct commit_list *parents;
 722                         packet_writer_write(writer, "unshallow %s",
 723                                             oid_to_hex(&object->oid));
 724                         object->flags &= ~CLIENT_SHALLOW;
 725                         /*
 726                          * We want to _register_ "object" as shallow, but we
 727                          * also need to traverse object's parents to deepen a
 728                          * shallow clone. Unregister it for now so we can
 729                          * parse and add the parents to the want list, then
 730                          * re-register it.
 731                          */
 732                         unregister_shallow(&object->oid);
 733                         object->parsed = 0;
 734                         parse_commit_or_die((struct commit *)object);
 735                         parents = ((struct commit *)object)->parents;
 736                         while (parents) {
 737                                 add_object_array(&parents->item->object,
 738                                                  NULL, want_obj);
 739                                 parents = parents->next;
 740                         }
 741                         add_object_array(object, NULL, &extra_edge_obj);
 742                 }
 743                 /* make sure commit traversal conforms to client */
 744                 register_shallow(the_repository, &object->oid);
 745         }
 746 }
 747
 748 static int check_ref(const char *refname_full, const struct object_id *oid,
 749                      int flag, void *cb_data);
 750 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
 751                    struct object_array *shallows, struct object_array *want_obj)
 752 {
 753         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 754                 int i;
 755
 756                 for (i = 0; i < shallows->nr; i++) {
 757                         struct object *object = shallows->objects[i].item;
 758                         object->flags |= NOT_SHALLOW;
 759                 }
 760         } else if (deepen_relative) {
 761                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 762                 struct commit_list *result;
 763
 764                 /*
 765                  * Checking for reachable shallows requires that our refs be
 766                  * marked with OUR_REF.
 767                  */
 768                 head_ref_namespaced(check_ref, NULL);
 769                 for_each_namespaced_ref(check_ref, NULL);
 770
 771                 get_reachable_list(shallows, &reachable_shallows);
 772                 result = get_shallow_commits(&reachable_shallows,
 773                                              depth + 1,
 774                                              SHALLOW, NOT_SHALLOW);
 775                 send_shallow(writer, result);
 776                 free_commit_list(result);
 777                 object_array_clear(&reachable_shallows);
 778         } else {
 779                 struct commit_list *result;
 780
 781                 result = get_shallow_commits(want_obj, depth,
 782                                              SHALLOW, NOT_SHALLOW);
 783                 send_shallow(writer, result);
 784                 free_commit_list(result);
 785         }
 786
 787         send_unshallow(writer, shallows, want_obj);
 788 }
 789
 790 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
 791                                const char **av,
 792                                struct object_array *shallows,
 793                                struct object_array *want_obj)
 794 {
 795         struct commit_list *result;
 796
 797         disable_commit_graph(the_repository);
 798         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 799         send_shallow(writer, result);
 800         free_commit_list(result);
 801         send_unshallow(writer, shallows, want_obj);
 802 }
 803
 804 /* Returns 1 if a shallow list is sent or 0 otherwise */
 805 static int send_shallow_list(struct packet_writer *writer,
 806                              int depth, int deepen_rev_list,
 807                              timestamp_t deepen_since,
 808                              struct string_list *deepen_not,
 809                              int deepen_relative,
 810                              struct object_array *shallows,
 811                              struct object_array *want_obj)
 812 {
 813         int ret = 0;
 814
 815         if (depth > 0 && deepen_rev_list)
 816                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 817         if (depth > 0) {
 818                 deepen(writer, depth, deepen_relative, shallows, want_obj);
 819                 ret = 1;
 820         } else if (deepen_rev_list) {
 821                 struct argv_array av = ARGV_ARRAY_INIT;
 822                 int i;
 823
 824                 argv_array_push(&av, "rev-list");
 825                 if (deepen_since)
 826                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 827                 if (deepen_not->nr) {
 828                         argv_array_push(&av, "--not");
 829                         for (i = 0; i < deepen_not->nr; i++) {
 830                                 struct string_list_item *s = deepen_not->items + i;
 831                                 argv_array_push(&av, s->string);
 832                         }
 833                         argv_array_push(&av, "--not");
 834                 }
 835                 for (i = 0; i < want_obj->nr; i++) {
 836                         struct object *o = want_obj->objects[i].item;
 837                         argv_array_push(&av, oid_to_hex(&o->oid));
 838                 }
 839                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
 840                 argv_array_clear(&av);
 841                 ret = 1;
 842         } else {
 843                 if (shallows->nr > 0) {
 844                         int i;
 845                         for (i = 0; i < shallows->nr; i++)
 846                                 register_shallow(the_repository,
 847                                                  &shallows->objects[i].item->oid);
 848                 }
 849         }
 850
 851         shallow_nr += shallows->nr;
 852         return ret;
 853 }
 854
 855 static int process_shallow(const char *line, struct object_array *shallows)
 856 {
 857         const char *arg;
 858         if (skip_prefix(line, "shallow ", &arg)) {
 859                 struct object_id oid;
 860                 struct object *object;
 861                 if (get_oid_hex(arg, &oid))
 862                         die("invalid shallow line: %s", line);
 863                 object = parse_object(the_repository, &oid);
 864                 if (!object)
 865                         return 1;
 866                 if (object->type != OBJ_COMMIT)
 867                         die("invalid shallow object %s", oid_to_hex(&oid));
 868                 if (!(object->flags & CLIENT_SHALLOW)) {
 869                         object->flags |= CLIENT_SHALLOW;
 870                         add_object_array(object, NULL, shallows);
 871                 }
 872                 return 1;
 873         }
 874
 875         return 0;
 876 }
 877
 878 static int process_deepen(const char *line, int *depth)
 879 {
 880         const char *arg;
 881         if (skip_prefix(line, "deepen ", &arg)) {
 882                 char *end = NULL;
 883                 *depth = (int)strtol(arg, &end, 0);
 884                 if (!end || *end || *depth <= 0)
 885                         die("Invalid deepen: %s", line);
 886                 return 1;
 887         }
 888
 889         return 0;
 890 }
 891
 892 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 893 {
 894         const char *arg;
 895         if (skip_prefix(line, "deepen-since ", &arg)) {
 896                 char *end = NULL;
 897                 *deepen_since = parse_timestamp(arg, &end, 0);
 898                 if (!end || *end || !deepen_since ||
 899                     /* revisions.c's max_age -1 is special */
 900                     *deepen_since == -1)
 901                         die("Invalid deepen-since: %s", line);
 902                 *deepen_rev_list = 1;
 903                 return 1;
 904         }
 905         return 0;
 906 }
 907
 908 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 909 {
 910         const char *arg;
 911         if (skip_prefix(line, "deepen-not ", &arg)) {
 912                 char *ref = NULL;
 913                 struct object_id oid;
 914                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 915                         die("git upload-pack: ambiguous deepen-not: %s", line);
 916                 string_list_append(deepen_not, ref);
 917                 free(ref);
 918                 *deepen_rev_list = 1;
 919                 return 1;
 920         }
 921         return 0;
 922 }
 923
 924 static void receive_needs(struct upload_pack_data *data,
 925                           struct packet_reader *reader)
 926 {
 927         int has_non_tip = 0;
 928
 929         shallow_nr = 0;
 930         for (;;) {
 931                 struct object *o;
 932                 const char *features;
 933                 struct object_id oid_buf;
 934                 const char *arg;
 935
 936                 reset_timeout(data->timeout);
 937                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 938                         break;
 939
 940                 if (process_shallow(reader->line, &data->shallows))
 941                         continue;
 942                 if (process_deepen(reader->line, &data->depth))
 943                         continue;
 944                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
 945                         continue;
 946                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
 947                         continue;
 948
 949                 if (skip_prefix(reader->line, "filter ", &arg)) {
 950                         if (!data->filter_capability_requested)
 951                                 die("git upload-pack: filtering capability not negotiated");
 952                         list_objects_filter_die_if_populated(&data->filter_options);
 953                         parse_list_objects_filter(&data->filter_options, arg);
 954                         continue;
 955                 }
 956
 957                 if (!skip_prefix(reader->line, "want ", &arg) ||
 958                     parse_oid_hex(arg, &oid_buf, &features))
 959                         die("git upload-pack: protocol error, "
 960                             "expected to get object ID, not '%s'", reader->line);
 961
 962                 if (parse_feature_request(features, "deepen-relative"))
 963                         data->deepen_relative = 1;
 964                 if (parse_feature_request(features, "multi_ack_detailed"))
 965                         data->multi_ack = MULTI_ACK_DETAILED;
 966                 else if (parse_feature_request(features, "multi_ack"))
 967                         data->multi_ack = MULTI_ACK;
 968                 if (parse_feature_request(features, "no-done"))
 969                         data->no_done = 1;
 970                 if (parse_feature_request(features, "thin-pack"))
 971                         data->use_thin_pack = 1;
 972                 if (parse_feature_request(features, "ofs-delta"))
 973                         data->use_ofs_delta = 1;
 974                 if (parse_feature_request(features, "side-band-64k"))
 975                         data->use_sideband = LARGE_PACKET_MAX;
 976                 else if (parse_feature_request(features, "side-band"))
 977                         data->use_sideband = DEFAULT_PACKET_MAX;
 978                 if (parse_feature_request(features, "no-progress"))
 979                         data->no_progress = 1;
 980                 if (parse_feature_request(features, "include-tag"))
 981                         data->use_include_tag = 1;
 982                 if (allow_filter && parse_feature_request(features, "filter"))
 983                         data->filter_capability_requested = 1;
 984
 985                 o = parse_object(the_repository, &oid_buf);
 986                 if (!o) {
 987                         packet_writer_error(&data->writer,
 988                                             "upload-pack: not our ref %s",
 989                                             oid_to_hex(&oid_buf));
 990                         die("git upload-pack: not our ref %s",
 991                             oid_to_hex(&oid_buf));
 992                 }
 993                 if (!(o->flags & WANTED)) {
 994                         o->flags |= WANTED;
 995                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 996                               || is_our_ref(o)))
 997                                 has_non_tip = 1;
 998                         add_object_array(o, NULL, &data->want_obj);
 999                 }
1000         }
1001
1002         /*
1003          * We have sent all our refs already, and the other end
1004          * should have chosen out of them. When we are operating
1005          * in the stateless RPC mode, however, their choice may
1006          * have been based on the set of older refs advertised
1007          * by another process that handled the initial request.
1008          */
1009         if (has_non_tip)
1010                 check_non_tip(data);
1011
1012         if (!data->use_sideband && data->daemon_mode)
1013                 data->no_progress = 1;
1014
1015         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1016                 return;
1017
1018         if (send_shallow_list(&data->writer,
1019                               data->depth,
1020                               data->deepen_rev_list,
1021                               data->deepen_since,
1022                               &data->deepen_not,
1023                               data->deepen_relative,
1024                               &data->shallows,
1025                               &data->want_obj))
1026                 packet_flush(1);
1027 }
1028
1029 /* return non-zero if the ref is hidden, otherwise 0 */
1030 static int mark_our_ref(const char *refname, const char *refname_full,
1031                         const struct object_id *oid)
1032 {
1033         struct object *o = lookup_unknown_object(oid);
1034
1035         if (ref_is_hidden(refname, refname_full)) {
1036                 o->flags |= HIDDEN_REF;
1037                 return 1;
1038         }
1039         o->flags |= OUR_REF;
1040         return 0;
1041 }
1042
1043 static int check_ref(const char *refname_full, const struct object_id *oid,
1044                      int flag, void *cb_data)
1045 {
1046         const char *refname = strip_namespace(refname_full);
1047
1048         mark_our_ref(refname, refname_full, oid);
1049         return 0;
1050 }
1051
1052 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1053 {
1054         struct string_list_item *item;
1055
1056         if (!symref->nr)
1057                 return;
1058         for_each_string_list_item(item, symref)
1059                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1060 }
1061
1062 static int send_ref(const char *refname, const struct object_id *oid,
1063                     int flag, void *cb_data)
1064 {
1065         static const char *capabilities = "multi_ack thin-pack side-band"
1066                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1067                 " deepen-relative no-progress include-tag multi_ack_detailed";
1068         const char *refname_nons = strip_namespace(refname);
1069         struct object_id peeled;
1070         struct upload_pack_data *data = cb_data;
1071
1072         if (mark_our_ref(refname_nons, refname, oid))
1073                 return 0;
1074
1075         if (capabilities) {
1076                 struct strbuf symref_info = STRBUF_INIT;
1077
1078                 format_symref_info(&symref_info, &data->symref);
1079                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1080                              oid_to_hex(oid), refname_nons,
1081                              0, capabilities,
1082                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1083                                      " allow-tip-sha1-in-want" : "",
1084                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1085                                      " allow-reachable-sha1-in-want" : "",
1086                              data->stateless_rpc ? " no-done" : "",
1087                              symref_info.buf,
1088                              allow_filter ? " filter" : "",
1089                              git_user_agent_sanitized());
1090                 strbuf_release(&symref_info);
1091         } else {
1092                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1093         }
1094         capabilities = NULL;
1095         if (!peel_ref(refname, &peeled))
1096                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1097         return 0;
1098 }
1099
1100 static int find_symref(const char *refname, const struct object_id *oid,
1101                        int flag, void *cb_data)
1102 {
1103         const char *symref_target;
1104         struct string_list_item *item;
1105
1106         if ((flag & REF_ISSYMREF) == 0)
1107                 return 0;
1108         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1109         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1110                 die("'%s' is a symref but it is not?", refname);
1111         item = string_list_append(cb_data, strip_namespace(refname));
1112         item->util = xstrdup(strip_namespace(symref_target));
1113         return 0;
1114 }
1115
1116 static int upload_pack_config(const char *var, const char *value, void *unused)
1117 {
1118         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1119                 if (git_config_bool(var, value))
1120                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1121                 else
1122                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1123         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1124                 if (git_config_bool(var, value))
1125                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1126                 else
1127                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1128         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1129                 if (git_config_bool(var, value))
1130                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1131                 else
1132                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1133         } else if (!strcmp("uploadpack.keepalive", var)) {
1134                 keepalive = git_config_int(var, value);
1135                 if (!keepalive)
1136                         keepalive = -1;
1137         } else if (!strcmp("uploadpack.allowfilter", var)) {
1138                 allow_filter = git_config_bool(var, value);
1139         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1140                 allow_ref_in_want = git_config_bool(var, value);
1141         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1142                 allow_sideband_all = git_config_bool(var, value);
1143         } else if (!strcmp("core.precomposeunicode", var)) {
1144                 precomposed_unicode = git_config_bool(var, value);
1145         }
1146
1147         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1148         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1149                 if (!strcmp("uploadpack.packobjectshook", var))
1150                         return git_config_string(&pack_objects_hook, var, value);
1151         }
1152
1153         return parse_hide_refs_config(var, value, "uploadpack");
1154 }
1155
1156 void upload_pack(struct upload_pack_options *options)
1157 {
1158         struct packet_reader reader;
1159         struct upload_pack_data data;
1160
1161         git_config(upload_pack_config, NULL);
1162
1163         upload_pack_data_init(&data);
1164
1165         data.stateless_rpc = options->stateless_rpc;
1166         data.daemon_mode = options->daemon_mode;
1167         data.timeout = options->timeout;
1168
1169         head_ref_namespaced(find_symref, &data.symref);
1170
1171         if (options->advertise_refs || !data.stateless_rpc) {
1172                 reset_timeout(data.timeout);
1173                 head_ref_namespaced(send_ref, &data);
1174                 for_each_namespaced_ref(send_ref, &data);
1175                 advertise_shallow_grafts(1);
1176                 packet_flush(1);
1177         } else {
1178                 head_ref_namespaced(check_ref, NULL);
1179                 for_each_namespaced_ref(check_ref, NULL);
1180         }
1181
1182         if (!options->advertise_refs) {
1183                 packet_reader_init(&reader, 0, NULL, 0,
1184                                    PACKET_READ_CHOMP_NEWLINE |
1185                                    PACKET_READ_DIE_ON_ERR_PACKET);
1186
1187                 receive_needs(&data, &reader);
1188                 if (data.want_obj.nr) {
1189                         get_common_commits(&data, &reader);
1190                         create_pack_file(&data);
1191                 }
1192         }
1193
1194         upload_pack_data_clear(&data);
1195 }
1196
1197 static int parse_want(struct packet_writer *writer, const char *line,
1198                       struct object_array *want_obj)
1199 {
1200         const char *arg;
1201         if (skip_prefix(line, "want ", &arg)) {
1202                 struct object_id oid;
1203                 struct object *o;
1204
1205                 if (get_oid_hex(arg, &oid))
1206                         die("git upload-pack: protocol error, "
1207                             "expected to get oid, not '%s'", line);
1208
1209                 o = parse_object(the_repository, &oid);
1210                 if (!o) {
1211                         packet_writer_error(writer,
1212                                             "upload-pack: not our ref %s",
1213                                             oid_to_hex(&oid));
1214                         die("git upload-pack: not our ref %s",
1215                             oid_to_hex(&oid));
1216                 }
1217
1218                 if (!(o->flags & WANTED)) {
1219                         o->flags |= WANTED;
1220                         add_object_array(o, NULL, want_obj);
1221                 }
1222
1223                 return 1;
1224         }
1225
1226         return 0;
1227 }
1228
1229 static int parse_want_ref(struct packet_writer *writer, const char *line,
1230                           struct string_list *wanted_refs,
1231                           struct object_array *want_obj)
1232 {
1233         const char *arg;
1234         if (skip_prefix(line, "want-ref ", &arg)) {
1235                 struct object_id oid;
1236                 struct string_list_item *item;
1237                 struct object *o;
1238
1239                 if (read_ref(arg, &oid)) {
1240                         packet_writer_error(writer, "unknown ref %s", arg);
1241                         die("unknown ref %s", arg);
1242                 }
1243
1244                 item = string_list_append(wanted_refs, arg);
1245                 item->util = oiddup(&oid);
1246
1247                 o = parse_object_or_die(&oid, arg);
1248                 if (!(o->flags & WANTED)) {
1249                         o->flags |= WANTED;
1250                         add_object_array(o, NULL, want_obj);
1251                 }
1252
1253                 return 1;
1254         }
1255
1256         return 0;
1257 }
1258
1259 static int parse_have(const char *line, struct oid_array *haves)
1260 {
1261         const char *arg;
1262         if (skip_prefix(line, "have ", &arg)) {
1263                 struct object_id oid;
1264
1265                 if (get_oid_hex(arg, &oid))
1266                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1267                 oid_array_append(haves, &oid);
1268                 return 1;
1269         }
1270
1271         return 0;
1272 }
1273
1274 static void process_args(struct packet_reader *request,
1275                          struct upload_pack_data *data)
1276 {
1277         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1278                 const char *arg = request->line;
1279                 const char *p;
1280
1281                 /* process want */
1282                 if (parse_want(&data->writer, arg, &data->want_obj))
1283                         continue;
1284                 if (allow_ref_in_want &&
1285                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1286                                    &data->want_obj))
1287                         continue;
1288                 /* process have line */
1289                 if (parse_have(arg, &data->haves))
1290                         continue;
1291
1292                 /* process args like thin-pack */
1293                 if (!strcmp(arg, "thin-pack")) {
1294                         data->use_thin_pack = 1;
1295                         continue;
1296                 }
1297                 if (!strcmp(arg, "ofs-delta")) {
1298                         data->use_ofs_delta = 1;
1299                         continue;
1300                 }
1301                 if (!strcmp(arg, "no-progress")) {
1302                         data->no_progress = 1;
1303                         continue;
1304                 }
1305                 if (!strcmp(arg, "include-tag")) {
1306                         data->use_include_tag = 1;
1307                         continue;
1308                 }
1309                 if (!strcmp(arg, "done")) {
1310                         data->done = 1;
1311                         continue;
1312                 }
1313
1314                 /* Shallow related arguments */
1315                 if (process_shallow(arg, &data->shallows))
1316                         continue;
1317                 if (process_deepen(arg, &data->depth))
1318                         continue;
1319                 if (process_deepen_since(arg, &data->deepen_since,
1320                                          &data->deepen_rev_list))
1321                         continue;
1322                 if (process_deepen_not(arg, &data->deepen_not,
1323                                        &data->deepen_rev_list))
1324                         continue;
1325                 if (!strcmp(arg, "deepen-relative")) {
1326                         data->deepen_relative = 1;
1327                         continue;
1328                 }
1329
1330                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1331                         list_objects_filter_die_if_populated(&data->filter_options);
1332                         parse_list_objects_filter(&data->filter_options, p);
1333                         continue;
1334                 }
1335
1336                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1337                      allow_sideband_all) &&
1338                     !strcmp(arg, "sideband-all")) {
1339                         data->writer.use_sideband = 1;
1340                         continue;
1341                 }
1342
1343                 /* ignore unknown lines maybe? */
1344                 die("unexpected line: '%s'", arg);
1345         }
1346
1347         if (request->status != PACKET_READ_FLUSH)
1348                 die(_("expected flush after fetch arguments"));
1349 }
1350
1351 static int process_haves(struct oid_array *haves, struct oid_array *common,
1352                          struct object_array *have_obj)
1353 {
1354         int i;
1355
1356         /* Process haves */
1357         for (i = 0; i < haves->nr; i++) {
1358                 const struct object_id *oid = &haves->oid[i];
1359                 struct object *o;
1360                 int we_knew_they_have = 0;
1361
1362                 if (!has_object_file(oid))
1363                         continue;
1364
1365                 oid_array_append(common, oid);
1366
1367                 o = parse_object(the_repository, oid);
1368                 if (!o)
1369                         die("oops (%s)", oid_to_hex(oid));
1370                 if (o->type == OBJ_COMMIT) {
1371                         struct commit_list *parents;
1372                         struct commit *commit = (struct commit *)o;
1373                         if (o->flags & THEY_HAVE)
1374                                 we_knew_they_have = 1;
1375                         else
1376                                 o->flags |= THEY_HAVE;
1377                         if (!oldest_have || (commit->date < oldest_have))
1378                                 oldest_have = commit->date;
1379                         for (parents = commit->parents;
1380                              parents;
1381                              parents = parents->next)
1382                                 parents->item->object.flags |= THEY_HAVE;
1383                 }
1384                 if (!we_knew_they_have)
1385                         add_object_array(o, NULL, have_obj);
1386         }
1387
1388         return 0;
1389 }
1390
1391 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1392                      const struct object_array *have_obj,
1393                      struct object_array *want_obj)
1394 {
1395         int i;
1396
1397         packet_writer_write(writer, "acknowledgments\n");
1398
1399         /* Send Acks */
1400         if (!acks->nr)
1401                 packet_writer_write(writer, "NAK\n");
1402
1403         for (i = 0; i < acks->nr; i++) {
1404                 packet_writer_write(writer, "ACK %s\n",
1405                                     oid_to_hex(&acks->oid[i]));
1406         }
1407
1408         if (ok_to_give_up(have_obj, want_obj)) {
1409                 /* Send Ready */
1410                 packet_writer_write(writer, "ready\n");
1411                 return 1;
1412         }
1413
1414         return 0;
1415 }
1416
1417 static int process_haves_and_send_acks(struct upload_pack_data *data)
1418 {
1419         struct oid_array common = OID_ARRAY_INIT;
1420         int ret = 0;
1421
1422         process_haves(&data->haves, &common, &data->have_obj);
1423         if (data->done) {
1424                 ret = 1;
1425         } else if (send_acks(&data->writer, &common,
1426                              &data->have_obj, &data->want_obj)) {
1427                 packet_writer_delim(&data->writer);
1428                 ret = 1;
1429         } else {
1430                 /* Add Flush */
1431                 packet_writer_flush(&data->writer);
1432                 ret = 0;
1433         }
1434
1435         oid_array_clear(&data->haves);
1436         oid_array_clear(&common);
1437         return ret;
1438 }
1439
1440 static void send_wanted_ref_info(struct upload_pack_data *data)
1441 {
1442         const struct string_list_item *item;
1443
1444         if (!data->wanted_refs.nr)
1445                 return;
1446
1447         packet_writer_write(&data->writer, "wanted-refs\n");
1448
1449         for_each_string_list_item(item, &data->wanted_refs) {
1450                 packet_writer_write(&data->writer, "%s %s\n",
1451                                     oid_to_hex(item->util),
1452                                     item->string);
1453         }
1454
1455         packet_writer_delim(&data->writer);
1456 }
1457
1458 static void send_shallow_info(struct upload_pack_data *data)
1459 {
1460         /* No shallow info needs to be sent */
1461         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1462             !is_repository_shallow(the_repository))
1463                 return;
1464
1465         packet_writer_write(&data->writer, "shallow-info\n");
1466
1467         if (!send_shallow_list(&data->writer, data->depth,
1468                                data->deepen_rev_list,
1469                                data->deepen_since, &data->deepen_not,
1470                                data->deepen_relative,
1471                                &data->shallows, &data->want_obj) &&
1472             is_repository_shallow(the_repository))
1473                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1474                        &data->shallows, &data->want_obj);
1475
1476         packet_delim(1);
1477 }
1478
1479 enum fetch_state {
1480         FETCH_PROCESS_ARGS = 0,
1481         FETCH_SEND_ACKS,
1482         FETCH_SEND_PACK,
1483         FETCH_DONE,
1484 };
1485
1486 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1487                    struct packet_reader *request)
1488 {
1489         enum fetch_state state = FETCH_PROCESS_ARGS;
1490         struct upload_pack_data data;
1491
1492         clear_object_flags(ALL_FLAGS);
1493
1494         git_config(upload_pack_config, NULL);
1495
1496         upload_pack_data_init(&data);
1497         data.use_sideband = LARGE_PACKET_MAX;
1498
1499         while (state != FETCH_DONE) {
1500                 switch (state) {
1501                 case FETCH_PROCESS_ARGS:
1502                         process_args(request, &data);
1503
1504                         if (!data.want_obj.nr) {
1505                                 /*
1506                                  * Request didn't contain any 'want' lines,
1507                                  * guess they didn't want anything.
1508                                  */
1509                                 state = FETCH_DONE;
1510                         } else if (data.haves.nr) {
1511                                 /*
1512                                  * Request had 'have' lines, so lets ACK them.
1513                                  */
1514                                 state = FETCH_SEND_ACKS;
1515                         } else {
1516                                 /*
1517                                  * Request had 'want's but no 'have's so we can
1518                                  * immedietly go to construct and send a pack.
1519                                  */
1520                                 state = FETCH_SEND_PACK;
1521                         }
1522                         break;
1523                 case FETCH_SEND_ACKS:
1524                         if (process_haves_and_send_acks(&data))
1525                                 state = FETCH_SEND_PACK;
1526                         else
1527                                 state = FETCH_DONE;
1528                         break;
1529                 case FETCH_SEND_PACK:
1530                         send_wanted_ref_info(&data);
1531                         send_shallow_info(&data);
1532
1533                         packet_writer_write(&data.writer, "packfile\n");
1534                         create_pack_file(&data);
1535                         state = FETCH_DONE;
1536                         break;
1537                 case FETCH_DONE:
1538                         continue;
1539                 }
1540         }
1541
1542         upload_pack_data_clear(&data);
1543         return 0;
1544 }
1545
1546 int upload_pack_advertise(struct repository *r,
1547                           struct strbuf *value)
1548 {
1549         if (value) {
1550                 int allow_filter_value;
1551                 int allow_ref_in_want;
1552                 int allow_sideband_all_value;
1553
1554                 strbuf_addstr(value, "shallow");
1555
1556                 if (!repo_config_get_bool(the_repository,
1557                                          "uploadpack.allowfilter",
1558                                          &allow_filter_value) &&
1559                     allow_filter_value)
1560                         strbuf_addstr(value, " filter");
1561
1562                 if (!repo_config_get_bool(the_repository,
1563                                          "uploadpack.allowrefinwant",
1564                                          &allow_ref_in_want) &&
1565                     allow_ref_in_want)
1566                         strbuf_addstr(value, " ref-in-want");
1567
1568                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1569                     (!repo_config_get_bool(the_repository,
1570                                            "uploadpack.allowsidebandall",
1571                                            &allow_sideband_all_value) &&
1572                      allow_sideband_all_value))
1573                         strbuf_addstr(value, " sideband-all");
1574         }
1575
1576         return 1;
1577 }