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

   1 #include "cache.h"
   2 #include "repository.h"
   3 #include "config.h"
   4 #include "lockfile.h"
   5 #include "refs.h"
   6 #include "pkt-line.h"
   7 #include "commit.h"
   8 #include "tag.h"
   9 #include "exec-cmd.h"
  10 #include "pack.h"
  11 #include "sideband.h"
  12 #include "fetch-pack.h"
  13 #include "remote.h"
  14 #include "run-command.h"
  15 #include "connect.h"
  16 #include "transport.h"
  17 #include "version.h"
  18 #include "oid-array.h"
  19 #include "oidset.h"
  20 #include "packfile.h"
  21 #include "object-store.h"
  22 #include "connected.h"
  23 #include "fetch-negotiator.h"
  24 #include "fsck.h"
  25 #include "shallow.h"
  26
  27 static int transfer_unpack_limit = -1;
  28 static int fetch_unpack_limit = -1;
  29 static int unpack_limit = 100;
  30 static int prefer_ofs_delta = 1;
  31 static int no_done;
  32 static int deepen_since_ok;
  33 static int deepen_not_ok;
  34 static int fetch_fsck_objects = -1;
  35 static int transfer_fsck_objects = -1;
  36 static int agent_supported;
  37 static int server_supports_filtering;
  38 static struct shallow_lock shallow_lock;
  39 static const char *alternate_shallow_file;
  40 static struct strbuf fsck_msg_types = STRBUF_INIT;
  41 static struct string_list uri_protocols = STRING_LIST_INIT_DUP;
  42
  43 /* Remember to update object flag allocation in object.h */
  44 #define COMPLETE        (1U << 0)
  45 #define ALTERNATE       (1U << 1)
  46
  47 /*
  48  * After sending this many "have"s if we do not get any new ACK , we
  49  * give up traversing our history.
  50  */
  51 #define MAX_IN_VAIN 256
  52
  53 static int multi_ack, use_sideband;
  54 /* Allow specifying sha1 if it is a ref tip. */
  55 #define ALLOW_TIP_SHA1  01
  56 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  57 #define ALLOW_REACHABLE_SHA1    02
  58 static unsigned int allow_unadvertised_object_request;
  59
  60 __attribute__((format (printf, 2, 3)))
  61 static inline void print_verbose(const struct fetch_pack_args *args,
  62                                  const char *fmt, ...)
  63 {
  64         va_list params;
  65
  66         if (!args->verbose)
  67                 return;
  68
  69         va_start(params, fmt);
  70         vfprintf(stderr, fmt, params);
  71         va_end(params);
  72         fputc('\n', stderr);
  73 }
  74
  75 struct alternate_object_cache {
  76         struct object **items;
  77         size_t nr, alloc;
  78 };
  79
  80 static void cache_one_alternate(const struct object_id *oid,
  81                                 void *vcache)
  82 {
  83         struct alternate_object_cache *cache = vcache;
  84         struct object *obj = parse_object(the_repository, oid);
  85
  86         if (!obj || (obj->flags & ALTERNATE))
  87                 return;
  88
  89         obj->flags |= ALTERNATE;
  90         ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
  91         cache->items[cache->nr++] = obj;
  92 }
  93
  94 static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
  95                                       void (*cb)(struct fetch_negotiator *,
  96                                                  struct object *))
  97 {
  98         static int initialized;
  99         static struct alternate_object_cache cache;
 100         size_t i;
 101
 102         if (!initialized) {
 103                 for_each_alternate_ref(cache_one_alternate, &cache);
 104                 initialized = 1;
 105         }
 106
 107         for (i = 0; i < cache.nr; i++)
 108                 cb(negotiator, cache.items[i]);
 109 }
 110
 111 static struct commit *deref_without_lazy_fetch(const struct object_id *oid,
 112                                                int mark_tags_complete)
 113 {
 114         enum object_type type;
 115         struct object_info info = { .typep = &type };
 116
 117         while (1) {
 118                 if (oid_object_info_extended(the_repository, oid, &info,
 119                                              OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK))
 120                         return NULL;
 121                 if (type == OBJ_TAG) {
 122                         struct tag *tag = (struct tag *)
 123                                 parse_object(the_repository, oid);
 124
 125                         if (!tag->tagged)
 126                                 return NULL;
 127                         if (mark_tags_complete)
 128                                 tag->object.flags |= COMPLETE;
 129                         oid = &tag->tagged->oid;
 130                 } else {
 131                         break;
 132                 }
 133         }
 134         if (type == OBJ_COMMIT)
 135                 return (struct commit *) parse_object(the_repository, oid);
 136         return NULL;
 137 }
 138
 139 static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
 140                                const struct object_id *oid)
 141 {
 142         struct commit *c = deref_without_lazy_fetch(oid, 0);
 143
 144         if (c)
 145                 negotiator->add_tip(negotiator, c);
 146         return 0;
 147 }
 148
 149 static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
 150                                    int flag, void *cb_data)
 151 {
 152         return rev_list_insert_ref(cb_data, oid);
 153 }
 154
 155 enum ack_type {
 156         NAK = 0,
 157         ACK,
 158         ACK_continue,
 159         ACK_common,
 160         ACK_ready
 161 };
 162
 163 static void consume_shallow_list(struct fetch_pack_args *args,
 164                                  struct packet_reader *reader)
 165 {
 166         if (args->stateless_rpc && args->deepen) {
 167                 /* If we sent a depth we will get back "duplicate"
 168                  * shallow and unshallow commands every time there
 169                  * is a block of have lines exchanged.
 170                  */
 171                 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
 172                         if (starts_with(reader->line, "shallow "))
 173                                 continue;
 174                         if (starts_with(reader->line, "unshallow "))
 175                                 continue;
 176                         die(_("git fetch-pack: expected shallow list"));
 177                 }
 178                 if (reader->status != PACKET_READ_FLUSH)
 179                         die(_("git fetch-pack: expected a flush packet after shallow list"));
 180         }
 181 }
 182
 183 static enum ack_type get_ack(struct packet_reader *reader,
 184                              struct object_id *result_oid)
 185 {
 186         int len;
 187         const char *arg;
 188
 189         if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 190                 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
 191         len = reader->pktlen;
 192
 193         if (!strcmp(reader->line, "NAK"))
 194                 return NAK;
 195         if (skip_prefix(reader->line, "ACK ", &arg)) {
 196                 const char *p;
 197                 if (!parse_oid_hex(arg, result_oid, &p)) {
 198                         len -= p - reader->line;
 199                         if (len < 1)
 200                                 return ACK;
 201                         if (strstr(p, "continue"))
 202                                 return ACK_continue;
 203                         if (strstr(p, "common"))
 204                                 return ACK_common;
 205                         if (strstr(p, "ready"))
 206                                 return ACK_ready;
 207                         return ACK;
 208                 }
 209         }
 210         die(_("git fetch-pack: expected ACK/NAK, got '%s'"), reader->line);
 211 }
 212
 213 static void send_request(struct fetch_pack_args *args,
 214                          int fd, struct strbuf *buf)
 215 {
 216         if (args->stateless_rpc) {
 217                 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
 218                 packet_flush(fd);
 219         } else {
 220                 if (write_in_full(fd, buf->buf, buf->len) < 0)
 221                         die_errno(_("unable to write to remote"));
 222         }
 223 }
 224
 225 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
 226                                         struct object *obj)
 227 {
 228         rev_list_insert_ref(negotiator, &obj->oid);
 229 }
 230
 231 #define INITIAL_FLUSH 16
 232 #define PIPESAFE_FLUSH 32
 233 #define LARGE_FLUSH 16384
 234
 235 static int next_flush(int stateless_rpc, int count)
 236 {
 237         if (stateless_rpc) {
 238                 if (count < LARGE_FLUSH)
 239                         count <<= 1;
 240                 else
 241                         count = count * 11 / 10;
 242         } else {
 243                 if (count < PIPESAFE_FLUSH)
 244                         count <<= 1;
 245                 else
 246                         count += PIPESAFE_FLUSH;
 247         }
 248         return count;
 249 }
 250
 251 static void mark_tips(struct fetch_negotiator *negotiator,
 252                       const struct oid_array *negotiation_tips)
 253 {
 254         int i;
 255
 256         if (!negotiation_tips) {
 257                 for_each_rawref(rev_list_insert_ref_oid, negotiator);
 258                 return;
 259         }
 260
 261         for (i = 0; i < negotiation_tips->nr; i++)
 262                 rev_list_insert_ref(negotiator, &negotiation_tips->oid[i]);
 263         return;
 264 }
 265
 266 static int find_common(struct fetch_negotiator *negotiator,
 267                        struct fetch_pack_args *args,
 268                        int fd[2], struct object_id *result_oid,
 269                        struct ref *refs)
 270 {
 271         int fetching;
 272         int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
 273         const struct object_id *oid;
 274         unsigned in_vain = 0;
 275         int got_continue = 0;
 276         int got_ready = 0;
 277         struct strbuf req_buf = STRBUF_INIT;
 278         size_t state_len = 0;
 279         struct packet_reader reader;
 280
 281         if (args->stateless_rpc && multi_ack == 1)
 282                 die(_("--stateless-rpc requires multi_ack_detailed"));
 283
 284         packet_reader_init(&reader, fd[0], NULL, 0,
 285                            PACKET_READ_CHOMP_NEWLINE |
 286                            PACKET_READ_DIE_ON_ERR_PACKET);
 287
 288         mark_tips(negotiator, args->negotiation_tips);
 289         for_each_cached_alternate(negotiator, insert_one_alternate_object);
 290
 291         fetching = 0;
 292         for ( ; refs ; refs = refs->next) {
 293                 struct object_id *remote = &refs->old_oid;
 294                 const char *remote_hex;
 295                 struct object *o;
 296
 297                 /*
 298                  * If that object is complete (i.e. it is an ancestor of a
 299                  * local ref), we tell them we have it but do not have to
 300                  * tell them about its ancestors, which they already know
 301                  * about.
 302                  *
 303                  * We use lookup_object here because we are only
 304                  * interested in the case we *know* the object is
 305                  * reachable and we have already scanned it.
 306                  */
 307                 if (((o = lookup_object(the_repository, remote)) != NULL) &&
 308                                 (o->flags & COMPLETE)) {
 309                         continue;
 310                 }
 311
 312                 remote_hex = oid_to_hex(remote);
 313                 if (!fetching) {
 314                         struct strbuf c = STRBUF_INIT;
 315                         if (multi_ack == 2)     strbuf_addstr(&c, " multi_ack_detailed");
 316                         if (multi_ack == 1)     strbuf_addstr(&c, " multi_ack");
 317                         if (no_done)            strbuf_addstr(&c, " no-done");
 318                         if (use_sideband == 2)  strbuf_addstr(&c, " side-band-64k");
 319                         if (use_sideband == 1)  strbuf_addstr(&c, " side-band");
 320                         if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
 321                         if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
 322                         if (args->no_progress)   strbuf_addstr(&c, " no-progress");
 323                         if (args->include_tag)   strbuf_addstr(&c, " include-tag");
 324                         if (prefer_ofs_delta)   strbuf_addstr(&c, " ofs-delta");
 325                         if (deepen_since_ok)    strbuf_addstr(&c, " deepen-since");
 326                         if (deepen_not_ok)      strbuf_addstr(&c, " deepen-not");
 327                         if (agent_supported)    strbuf_addf(&c, " agent=%s",
 328                                                             git_user_agent_sanitized());
 329                         if (args->filter_options.choice)
 330                                 strbuf_addstr(&c, " filter");
 331                         packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
 332                         strbuf_release(&c);
 333                 } else
 334                         packet_buf_write(&req_buf, "want %s\n", remote_hex);
 335                 fetching++;
 336         }
 337
 338         if (!fetching) {
 339                 strbuf_release(&req_buf);
 340                 packet_flush(fd[1]);
 341                 return 1;
 342         }
 343
 344         if (is_repository_shallow(the_repository))
 345                 write_shallow_commits(&req_buf, 1, NULL);
 346         if (args->depth > 0)
 347                 packet_buf_write(&req_buf, "deepen %d", args->depth);
 348         if (args->deepen_since) {
 349                 timestamp_t max_age = approxidate(args->deepen_since);
 350                 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
 351         }
 352         if (args->deepen_not) {
 353                 int i;
 354                 for (i = 0; i < args->deepen_not->nr; i++) {
 355                         struct string_list_item *s = args->deepen_not->items + i;
 356                         packet_buf_write(&req_buf, "deepen-not %s", s->string);
 357                 }
 358         }
 359         if (server_supports_filtering && args->filter_options.choice) {
 360                 const char *spec =
 361                         expand_list_objects_filter_spec(&args->filter_options);
 362                 packet_buf_write(&req_buf, "filter %s", spec);
 363         }
 364         packet_buf_flush(&req_buf);
 365         state_len = req_buf.len;
 366
 367         if (args->deepen) {
 368                 const char *arg;
 369                 struct object_id oid;
 370
 371                 send_request(args, fd[1], &req_buf);
 372                 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
 373                         if (skip_prefix(reader.line, "shallow ", &arg)) {
 374                                 if (get_oid_hex(arg, &oid))
 375                                         die(_("invalid shallow line: %s"), reader.line);
 376                                 register_shallow(the_repository, &oid);
 377                                 continue;
 378                         }
 379                         if (skip_prefix(reader.line, "unshallow ", &arg)) {
 380                                 if (get_oid_hex(arg, &oid))
 381                                         die(_("invalid unshallow line: %s"), reader.line);
 382                                 if (!lookup_object(the_repository, &oid))
 383                                         die(_("object not found: %s"), reader.line);
 384                                 /* make sure that it is parsed as shallow */
 385                                 if (!parse_object(the_repository, &oid))
 386                                         die(_("error in object: %s"), reader.line);
 387                                 if (unregister_shallow(&oid))
 388                                         die(_("no shallow found: %s"), reader.line);
 389                                 continue;
 390                         }
 391                         die(_("expected shallow/unshallow, got %s"), reader.line);
 392                 }
 393         } else if (!args->stateless_rpc)
 394                 send_request(args, fd[1], &req_buf);
 395
 396         if (!args->stateless_rpc) {
 397                 /* If we aren't using the stateless-rpc interface
 398                  * we don't need to retain the headers.
 399                  */
 400                 strbuf_setlen(&req_buf, 0);
 401                 state_len = 0;
 402         }
 403
 404         trace2_region_enter("fetch-pack", "negotiation_v0_v1", the_repository);
 405         flushes = 0;
 406         retval = -1;
 407         while ((oid = negotiator->next(negotiator))) {
 408                 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
 409                 print_verbose(args, "have %s", oid_to_hex(oid));
 410                 in_vain++;
 411                 if (flush_at <= ++count) {
 412                         int ack;
 413
 414                         packet_buf_flush(&req_buf);
 415                         send_request(args, fd[1], &req_buf);
 416                         strbuf_setlen(&req_buf, state_len);
 417                         flushes++;
 418                         flush_at = next_flush(args->stateless_rpc, count);
 419
 420                         /*
 421                          * We keep one window "ahead" of the other side, and
 422                          * will wait for an ACK only on the next one
 423                          */
 424                         if (!args->stateless_rpc && count == INITIAL_FLUSH)
 425                                 continue;
 426
 427                         consume_shallow_list(args, &reader);
 428                         do {
 429                                 ack = get_ack(&reader, result_oid);
 430                                 if (ack)
 431                                         print_verbose(args, _("got %s %d %s"), "ack",
 432                                                       ack, oid_to_hex(result_oid));
 433                                 switch (ack) {
 434                                 case ACK:
 435                                         flushes = 0;
 436                                         multi_ack = 0;
 437                                         retval = 0;
 438                                         goto done;
 439                                 case ACK_common:
 440                                 case ACK_ready:
 441                                 case ACK_continue: {
 442                                         struct commit *commit =
 443                                                 lookup_commit(the_repository,
 444                                                               result_oid);
 445                                         int was_common;
 446
 447                                         if (!commit)
 448                                                 die(_("invalid commit %s"), oid_to_hex(result_oid));
 449                                         was_common = negotiator->ack(negotiator, commit);
 450                                         if (args->stateless_rpc
 451                                          && ack == ACK_common
 452                                          && !was_common) {
 453                                                 /* We need to replay the have for this object
 454                                                  * on the next RPC request so the peer knows
 455                                                  * it is in common with us.
 456                                                  */
 457                                                 const char *hex = oid_to_hex(result_oid);
 458                                                 packet_buf_write(&req_buf, "have %s\n", hex);
 459                                                 state_len = req_buf.len;
 460                                                 /*
 461                                                  * Reset in_vain because an ack
 462                                                  * for this commit has not been
 463                                                  * seen.
 464                                                  */
 465                                                 in_vain = 0;
 466                                         } else if (!args->stateless_rpc
 467                                                    || ack != ACK_common)
 468                                                 in_vain = 0;
 469                                         retval = 0;
 470                                         got_continue = 1;
 471                                         if (ack == ACK_ready)
 472                                                 got_ready = 1;
 473                                         break;
 474                                         }
 475                                 }
 476                         } while (ack);
 477                         flushes--;
 478                         if (got_continue && MAX_IN_VAIN < in_vain) {
 479                                 print_verbose(args, _("giving up"));
 480                                 break; /* give up */
 481                         }
 482                         if (got_ready)
 483                                 break;
 484                 }
 485         }
 486 done:
 487         trace2_region_leave("fetch-pack", "negotiation_v0_v1", the_repository);
 488         if (!got_ready || !no_done) {
 489                 packet_buf_write(&req_buf, "done\n");
 490                 send_request(args, fd[1], &req_buf);
 491         }
 492         print_verbose(args, _("done"));
 493         if (retval != 0) {
 494                 multi_ack = 0;
 495                 flushes++;
 496         }
 497         strbuf_release(&req_buf);
 498
 499         if (!got_ready || !no_done)
 500                 consume_shallow_list(args, &reader);
 501         while (flushes || multi_ack) {
 502                 int ack = get_ack(&reader, result_oid);
 503                 if (ack) {
 504                         print_verbose(args, _("got %s (%d) %s"), "ack",
 505                                       ack, oid_to_hex(result_oid));
 506                         if (ack == ACK)
 507                                 return 0;
 508                         multi_ack = 1;
 509                         continue;
 510                 }
 511                 flushes--;
 512         }
 513         /* it is no error to fetch into a completely empty repo */
 514         return count ? retval : 0;
 515 }
 516
 517 static struct commit_list *complete;
 518
 519 static int mark_complete(const struct object_id *oid)
 520 {
 521         struct commit *commit = deref_without_lazy_fetch(oid, 1);
 522
 523         if (commit && !(commit->object.flags & COMPLETE)) {
 524                 commit->object.flags |= COMPLETE;
 525                 commit_list_insert(commit, &complete);
 526         }
 527         return 0;
 528 }
 529
 530 static int mark_complete_oid(const char *refname, const struct object_id *oid,
 531                              int flag, void *cb_data)
 532 {
 533         return mark_complete(oid);
 534 }
 535
 536 static void mark_recent_complete_commits(struct fetch_pack_args *args,
 537                                          timestamp_t cutoff)
 538 {
 539         while (complete && cutoff <= complete->item->date) {
 540                 print_verbose(args, _("Marking %s as complete"),
 541                               oid_to_hex(&complete->item->object.oid));
 542                 pop_most_recent_commit(&complete, COMPLETE);
 543         }
 544 }
 545
 546 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
 547 {
 548         for (; refs; refs = refs->next)
 549                 oidset_insert(oids, &refs->old_oid);
 550 }
 551
 552 static int is_unmatched_ref(const struct ref *ref)
 553 {
 554         struct object_id oid;
 555         const char *p;
 556         return  ref->match_status == REF_NOT_MATCHED &&
 557                 !parse_oid_hex(ref->name, &oid, &p) &&
 558                 *p == '\0' &&
 559                 oideq(&oid, &ref->old_oid);
 560 }
 561
 562 static void filter_refs(struct fetch_pack_args *args,
 563                         struct ref **refs,
 564                         struct ref **sought, int nr_sought)
 565 {
 566         struct ref *newlist = NULL;
 567         struct ref **newtail = &newlist;
 568         struct ref *unmatched = NULL;
 569         struct ref *ref, *next;
 570         struct oidset tip_oids = OIDSET_INIT;
 571         int i;
 572         int strict = !(allow_unadvertised_object_request &
 573                        (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 574
 575         i = 0;
 576         for (ref = *refs; ref; ref = next) {
 577                 int keep = 0;
 578                 next = ref->next;
 579
 580                 if (starts_with(ref->name, "refs/") &&
 581                     check_refname_format(ref->name, 0)) {
 582                         /*
 583                          * trash or a peeled value; do not even add it to
 584                          * unmatched list
 585                          */
 586                         free_one_ref(ref);
 587                         continue;
 588                 } else {
 589                         while (i < nr_sought) {
 590                                 int cmp = strcmp(ref->name, sought[i]->name);
 591                                 if (cmp < 0)
 592                                         break; /* definitely do not have it */
 593                                 else if (cmp == 0) {
 594                                         keep = 1; /* definitely have it */
 595                                         sought[i]->match_status = REF_MATCHED;
 596                                 }
 597                                 i++;
 598                         }
 599
 600                         if (!keep && args->fetch_all &&
 601                             (!args->deepen || !starts_with(ref->name, "refs/tags/")))
 602                                 keep = 1;
 603                 }
 604
 605                 if (keep) {
 606                         *newtail = ref;
 607                         ref->next = NULL;
 608                         newtail = &ref->next;
 609                 } else {
 610                         ref->next = unmatched;
 611                         unmatched = ref;
 612                 }
 613         }
 614
 615         if (strict) {
 616                 for (i = 0; i < nr_sought; i++) {
 617                         ref = sought[i];
 618                         if (!is_unmatched_ref(ref))
 619                                 continue;
 620
 621                         add_refs_to_oidset(&tip_oids, unmatched);
 622                         add_refs_to_oidset(&tip_oids, newlist);
 623                         break;
 624                 }
 625         }
 626
 627         /* Append unmatched requests to the list */
 628         for (i = 0; i < nr_sought; i++) {
 629                 ref = sought[i];
 630                 if (!is_unmatched_ref(ref))
 631                         continue;
 632
 633                 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
 634                         ref->match_status = REF_MATCHED;
 635                         *newtail = copy_ref(ref);
 636                         newtail = &(*newtail)->next;
 637                 } else {
 638                         ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
 639                 }
 640         }
 641
 642         oidset_clear(&tip_oids);
 643         free_refs(unmatched);
 644
 645         *refs = newlist;
 646 }
 647
 648 static void mark_alternate_complete(struct fetch_negotiator *unused,
 649                                     struct object *obj)
 650 {
 651         mark_complete(&obj->oid);
 652 }
 653
 654 struct loose_object_iter {
 655         struct oidset *loose_object_set;
 656         struct ref *refs;
 657 };
 658
 659 /*
 660  * Mark recent commits available locally and reachable from a local ref as
 661  * COMPLETE.
 662  *
 663  * The cutoff time for recency is determined by this heuristic: it is the
 664  * earliest commit time of the objects in refs that are commits and that we know
 665  * the commit time of.
 666  */
 667 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
 668                                          struct fetch_pack_args *args,
 669                                          struct ref **refs)
 670 {
 671         struct ref *ref;
 672         int old_save_commit_buffer = save_commit_buffer;
 673         timestamp_t cutoff = 0;
 674
 675         save_commit_buffer = 0;
 676
 677         trace2_region_enter("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
 678         for (ref = *refs; ref; ref = ref->next) {
 679                 struct object *o;
 680
 681                 if (!has_object_file_with_flags(&ref->old_oid,
 682                                                 OBJECT_INFO_QUICK |
 683                                                         OBJECT_INFO_SKIP_FETCH_OBJECT))
 684                         continue;
 685                 o = parse_object(the_repository, &ref->old_oid);
 686                 if (!o)
 687                         continue;
 688
 689                 /*
 690                  * We already have it -- which may mean that we were
 691                  * in sync with the other side at some time after
 692                  * that (it is OK if we guess wrong here).
 693                  */
 694                 if (o->type == OBJ_COMMIT) {
 695                         struct commit *commit = (struct commit *)o;
 696                         if (!cutoff || cutoff < commit->date)
 697                                 cutoff = commit->date;
 698                 }
 699         }
 700         trace2_region_leave("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
 701
 702         /*
 703          * This block marks all local refs as COMPLETE, and then recursively marks all
 704          * parents of those refs as COMPLETE.
 705          */
 706         trace2_region_enter("fetch-pack", "mark_complete_local_refs", NULL);
 707         if (!args->deepen) {
 708                 for_each_rawref(mark_complete_oid, NULL);
 709                 for_each_cached_alternate(NULL, mark_alternate_complete);
 710                 commit_list_sort_by_date(&complete);
 711                 if (cutoff)
 712                         mark_recent_complete_commits(args, cutoff);
 713         }
 714         trace2_region_leave("fetch-pack", "mark_complete_local_refs", NULL);
 715
 716         /*
 717          * Mark all complete remote refs as common refs.
 718          * Don't mark them common yet; the server has to be told so first.
 719          */
 720         trace2_region_enter("fetch-pack", "mark_common_remote_refs", NULL);
 721         for (ref = *refs; ref; ref = ref->next) {
 722                 struct commit *c = deref_without_lazy_fetch(&ref->old_oid, 0);
 723
 724                 if (!c || !(c->object.flags & COMPLETE))
 725                         continue;
 726
 727                 negotiator->known_common(negotiator, c);
 728         }
 729         trace2_region_leave("fetch-pack", "mark_common_remote_refs", NULL);
 730
 731         save_commit_buffer = old_save_commit_buffer;
 732 }
 733
 734 /*
 735  * Returns 1 if every object pointed to by the given remote refs is available
 736  * locally and reachable from a local ref, and 0 otherwise.
 737  */
 738 static int everything_local(struct fetch_pack_args *args,
 739                             struct ref **refs)
 740 {
 741         struct ref *ref;
 742         int retval;
 743
 744         for (retval = 1, ref = *refs; ref ; ref = ref->next) {
 745                 const struct object_id *remote = &ref->old_oid;
 746                 struct object *o;
 747
 748                 o = lookup_object(the_repository, remote);
 749                 if (!o || !(o->flags & COMPLETE)) {
 750                         retval = 0;
 751                         print_verbose(args, "want %s (%s)", oid_to_hex(remote),
 752                                       ref->name);
 753                         continue;
 754                 }
 755                 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
 756                               ref->name);
 757         }
 758
 759         return retval;
 760 }
 761
 762 static int sideband_demux(int in, int out, void *data)
 763 {
 764         int *xd = data;
 765         int ret;
 766
 767         ret = recv_sideband("fetch-pack", xd[0], out);
 768         close(out);
 769         return ret;
 770 }
 771
 772 static void write_promisor_file(const char *keep_name,
 773                                 struct ref **sought, int nr_sought)
 774 {
 775         struct strbuf promisor_name = STRBUF_INIT;
 776         int suffix_stripped;
 777         FILE *output;
 778         int i;
 779
 780         strbuf_addstr(&promisor_name, keep_name);
 781         suffix_stripped = strbuf_strip_suffix(&promisor_name, ".keep");
 782         if (!suffix_stripped)
 783                 BUG("name of pack lockfile should end with .keep (was '%s')",
 784                     keep_name);
 785         strbuf_addstr(&promisor_name, ".promisor");
 786
 787         output = xfopen(promisor_name.buf, "w");
 788         for (i = 0; i < nr_sought; i++)
 789                 fprintf(output, "%s %s\n", oid_to_hex(&sought[i]->old_oid),
 790                         sought[i]->name);
 791         fclose(output);
 792
 793         strbuf_release(&promisor_name);
 794 }
 795
 796 /*
 797  * Pass 1 as "only_packfile" if the pack received is the only pack in this
 798  * fetch request (that is, if there were no packfile URIs provided).
 799  */
 800 static int get_pack(struct fetch_pack_args *args,
 801                     int xd[2], struct string_list *pack_lockfiles,
 802                     int only_packfile,
 803                     struct ref **sought, int nr_sought)
 804 {
 805         struct async demux;
 806         int do_keep = args->keep_pack;
 807         const char *cmd_name;
 808         struct pack_header header;
 809         int pass_header = 0;
 810         struct child_process cmd = CHILD_PROCESS_INIT;
 811         int ret;
 812
 813         memset(&demux, 0, sizeof(demux));
 814         if (use_sideband) {
 815                 /* xd[] is talking with upload-pack; subprocess reads from
 816                  * xd[0], spits out band#2 to stderr, and feeds us band#1
 817                  * through demux->out.
 818                  */
 819                 demux.proc = sideband_demux;
 820                 demux.data = xd;
 821                 demux.out = -1;
 822                 demux.isolate_sigpipe = 1;
 823                 if (start_async(&demux))
 824                         die(_("fetch-pack: unable to fork off sideband demultiplexer"));
 825         }
 826         else
 827                 demux.out = xd[0];
 828
 829         if (!args->keep_pack && unpack_limit) {
 830
 831                 if (read_pack_header(demux.out, &header))
 832                         die(_("protocol error: bad pack header"));
 833                 pass_header = 1;
 834                 if (ntohl(header.hdr_entries) < unpack_limit)
 835                         do_keep = 0;
 836                 else
 837                         do_keep = 1;
 838         }
 839
 840         if (alternate_shallow_file) {
 841                 strvec_push(&cmd.args, "--shallow-file");
 842                 strvec_push(&cmd.args, alternate_shallow_file);
 843         }
 844
 845         if (do_keep || args->from_promisor) {
 846                 if (pack_lockfiles)
 847                         cmd.out = -1;
 848                 cmd_name = "index-pack";
 849                 strvec_push(&cmd.args, cmd_name);
 850                 strvec_push(&cmd.args, "--stdin");
 851                 if (!args->quiet && !args->no_progress)
 852                         strvec_push(&cmd.args, "-v");
 853                 if (args->use_thin_pack)
 854                         strvec_push(&cmd.args, "--fix-thin");
 855                 if (do_keep && (args->lock_pack || unpack_limit)) {
 856                         char hostname[HOST_NAME_MAX + 1];
 857                         if (xgethostname(hostname, sizeof(hostname)))
 858                                 xsnprintf(hostname, sizeof(hostname), "localhost");
 859                         strvec_pushf(&cmd.args,
 860                                      "--keep=fetch-pack %"PRIuMAX " on %s",
 861                                      (uintmax_t)getpid(), hostname);
 862                 }
 863                 if (only_packfile && args->check_self_contained_and_connected)
 864                         strvec_push(&cmd.args, "--check-self-contained-and-connected");
 865                 else
 866                         /*
 867                          * We cannot perform any connectivity checks because
 868                          * not all packs have been downloaded; let the caller
 869                          * have this responsibility.
 870                          */
 871                         args->check_self_contained_and_connected = 0;
 872
 873                 if (args->from_promisor)
 874                         /*
 875                          * write_promisor_file() may be called afterwards but
 876                          * we still need index-pack to know that this is a
 877                          * promisor pack. For example, if transfer.fsckobjects
 878                          * is true, index-pack needs to know that .gitmodules
 879                          * is a promisor object (so that it won't complain if
 880                          * it is missing).
 881                          */
 882                         strvec_push(&cmd.args, "--promisor");
 883         }
 884         else {
 885                 cmd_name = "unpack-objects";
 886                 strvec_push(&cmd.args, cmd_name);
 887                 if (args->quiet || args->no_progress)
 888                         strvec_push(&cmd.args, "-q");
 889                 args->check_self_contained_and_connected = 0;
 890         }
 891
 892         if (pass_header)
 893                 strvec_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
 894                              ntohl(header.hdr_version),
 895                                  ntohl(header.hdr_entries));
 896         if (fetch_fsck_objects >= 0
 897             ? fetch_fsck_objects
 898             : transfer_fsck_objects >= 0
 899             ? transfer_fsck_objects
 900             : 0) {
 901                 if (args->from_promisor || !only_packfile)
 902                         /*
 903                          * We cannot use --strict in index-pack because it
 904                          * checks both broken objects and links, but we only
 905                          * want to check for broken objects.
 906                          */
 907                         strvec_push(&cmd.args, "--fsck-objects");
 908                 else
 909                         strvec_pushf(&cmd.args, "--strict%s",
 910                                      fsck_msg_types.buf);
 911         }
 912
 913         cmd.in = demux.out;
 914         cmd.git_cmd = 1;
 915         if (start_command(&cmd))
 916                 die(_("fetch-pack: unable to fork off %s"), cmd_name);
 917         if (do_keep && pack_lockfiles) {
 918                 string_list_append_nodup(pack_lockfiles,
 919                                          index_pack_lockfile(cmd.out));
 920                 close(cmd.out);
 921         }
 922
 923         if (!use_sideband)
 924                 /* Closed by start_command() */
 925                 xd[0] = -1;
 926
 927         ret = finish_command(&cmd);
 928         if (!ret || (args->check_self_contained_and_connected && ret == 1))
 929                 args->self_contained_and_connected =
 930                         args->check_self_contained_and_connected &&
 931                         ret == 0;
 932         else
 933                 die(_("%s failed"), cmd_name);
 934         if (use_sideband && finish_async(&demux))
 935                 die(_("error in sideband demultiplexer"));
 936
 937         /*
 938          * Now that index-pack has succeeded, write the promisor file using the
 939          * obtained .keep filename if necessary
 940          */
 941         if (do_keep && pack_lockfiles && pack_lockfiles->nr && args->from_promisor)
 942                 write_promisor_file(pack_lockfiles->items[0].string, sought, nr_sought);
 943
 944         return 0;
 945 }
 946
 947 static int cmp_ref_by_name(const void *a_, const void *b_)
 948 {
 949         const struct ref *a = *((const struct ref **)a_);
 950         const struct ref *b = *((const struct ref **)b_);
 951         return strcmp(a->name, b->name);
 952 }
 953
 954 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
 955                                  int fd[2],
 956                                  const struct ref *orig_ref,
 957                                  struct ref **sought, int nr_sought,
 958                                  struct shallow_info *si,
 959                                  struct string_list *pack_lockfiles)
 960 {
 961         struct repository *r = the_repository;
 962         struct ref *ref = copy_ref_list(orig_ref);
 963         struct object_id oid;
 964         const char *agent_feature;
 965         int agent_len;
 966         struct fetch_negotiator negotiator_alloc;
 967         struct fetch_negotiator *negotiator;
 968
 969         negotiator = &negotiator_alloc;
 970         fetch_negotiator_init(r, negotiator);
 971
 972         sort_ref_list(&ref, ref_compare_name);
 973         QSORT(sought, nr_sought, cmp_ref_by_name);
 974
 975         if ((agent_feature = server_feature_value("agent", &agent_len))) {
 976                 agent_supported = 1;
 977                 if (agent_len)
 978                         print_verbose(args, _("Server version is %.*s"),
 979                                       agent_len, agent_feature);
 980         }
 981
 982         if (server_supports("shallow"))
 983                 print_verbose(args, _("Server supports %s"), "shallow");
 984         else if (args->depth > 0 || is_repository_shallow(r))
 985                 die(_("Server does not support shallow clients"));
 986         if (args->depth > 0 || args->deepen_since || args->deepen_not)
 987                 args->deepen = 1;
 988         if (server_supports("multi_ack_detailed")) {
 989                 print_verbose(args, _("Server supports %s"), "multi_ack_detailed");
 990                 multi_ack = 2;
 991                 if (server_supports("no-done")) {
 992                         print_verbose(args, _("Server supports %s"), "no-done");
 993                         if (args->stateless_rpc)
 994                                 no_done = 1;
 995                 }
 996         }
 997         else if (server_supports("multi_ack")) {
 998                 print_verbose(args, _("Server supports %s"), "multi_ack");
 999                 multi_ack = 1;
1000         }
1001         if (server_supports("side-band-64k")) {
1002                 print_verbose(args, _("Server supports %s"), "side-band-64k");
1003                 use_sideband = 2;
1004         }
1005         else if (server_supports("side-band")) {
1006                 print_verbose(args, _("Server supports %s"), "side-band");
1007                 use_sideband = 1;
1008         }
1009         if (server_supports("allow-tip-sha1-in-want")) {
1010                 print_verbose(args, _("Server supports %s"), "allow-tip-sha1-in-want");
1011                 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1012         }
1013         if (server_supports("allow-reachable-sha1-in-want")) {
1014                 print_verbose(args, _("Server supports %s"), "allow-reachable-sha1-in-want");
1015                 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1016         }
1017         if (server_supports("thin-pack"))
1018                 print_verbose(args, _("Server supports %s"), "thin-pack");
1019         else
1020                 args->use_thin_pack = 0;
1021         if (server_supports("no-progress"))
1022                 print_verbose(args, _("Server supports %s"), "no-progress");
1023         else
1024                 args->no_progress = 0;
1025         if (server_supports("include-tag"))
1026                 print_verbose(args, _("Server supports %s"), "include-tag");
1027         else
1028                 args->include_tag = 0;
1029         if (server_supports("ofs-delta"))
1030                 print_verbose(args, _("Server supports %s"), "ofs-delta");
1031         else
1032                 prefer_ofs_delta = 0;
1033
1034         if (server_supports("filter")) {
1035                 server_supports_filtering = 1;
1036                 print_verbose(args, _("Server supports %s"), "filter");
1037         } else if (args->filter_options.choice) {
1038                 warning("filtering not recognized by server, ignoring");
1039         }
1040
1041         if (server_supports("deepen-since")) {
1042                 print_verbose(args, _("Server supports %s"), "deepen-since");
1043                 deepen_since_ok = 1;
1044         } else if (args->deepen_since)
1045                 die(_("Server does not support --shallow-since"));
1046         if (server_supports("deepen-not")) {
1047                 print_verbose(args, _("Server supports %s"), "deepen-not");
1048                 deepen_not_ok = 1;
1049         } else if (args->deepen_not)
1050                 die(_("Server does not support --shallow-exclude"));
1051         if (server_supports("deepen-relative"))
1052                 print_verbose(args, _("Server supports %s"), "deepen-relative");
1053         else if (args->deepen_relative)
1054                 die(_("Server does not support --deepen"));
1055         if (!server_supports_hash(the_hash_algo->name, NULL))
1056                 die(_("Server does not support this repository's object format"));
1057
1058         mark_complete_and_common_ref(negotiator, args, &ref);
1059         filter_refs(args, &ref, sought, nr_sought);
1060         if (everything_local(args, &ref)) {
1061                 packet_flush(fd[1]);
1062                 goto all_done;
1063         }
1064         if (find_common(negotiator, args, fd, &oid, ref) < 0)
1065                 if (!args->keep_pack)
1066                         /* When cloning, it is not unusual to have
1067                          * no common commit.
1068                          */
1069                         warning(_("no common commits"));
1070
1071         if (args->stateless_rpc)
1072                 packet_flush(fd[1]);
1073         if (args->deepen)
1074                 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1075                                         NULL);
1076         else if (si->nr_ours || si->nr_theirs)
1077                 alternate_shallow_file = setup_temporary_shallow(si->shallow);
1078         else
1079                 alternate_shallow_file = NULL;
1080         if (get_pack(args, fd, pack_lockfiles, 1, sought, nr_sought))
1081                 die(_("git fetch-pack: fetch failed."));
1082
1083  all_done:
1084         if (negotiator)
1085                 negotiator->release(negotiator);
1086         return ref;
1087 }
1088
1089 static void add_shallow_requests(struct strbuf *req_buf,
1090                                  const struct fetch_pack_args *args)
1091 {
1092         if (is_repository_shallow(the_repository))
1093                 write_shallow_commits(req_buf, 1, NULL);
1094         if (args->depth > 0)
1095                 packet_buf_write(req_buf, "deepen %d", args->depth);
1096         if (args->deepen_since) {
1097                 timestamp_t max_age = approxidate(args->deepen_since);
1098                 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1099         }
1100         if (args->deepen_not) {
1101                 int i;
1102                 for (i = 0; i < args->deepen_not->nr; i++) {
1103                         struct string_list_item *s = args->deepen_not->items + i;
1104                         packet_buf_write(req_buf, "deepen-not %s", s->string);
1105                 }
1106         }
1107         if (args->deepen_relative)
1108                 packet_buf_write(req_buf, "deepen-relative\n");
1109 }
1110
1111 static void add_wants(const struct ref *wants, struct strbuf *req_buf)
1112 {
1113         int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1114
1115         for ( ; wants ; wants = wants->next) {
1116                 const struct object_id *remote = &wants->old_oid;
1117                 struct object *o;
1118
1119                 /*
1120                  * If that object is complete (i.e. it is an ancestor of a
1121                  * local ref), we tell them we have it but do not have to
1122                  * tell them about its ancestors, which they already know
1123                  * about.
1124                  *
1125                  * We use lookup_object here because we are only
1126                  * interested in the case we *know* the object is
1127                  * reachable and we have already scanned it.
1128                  */
1129                 if (((o = lookup_object(the_repository, remote)) != NULL) &&
1130                     (o->flags & COMPLETE)) {
1131                         continue;
1132                 }
1133
1134                 if (!use_ref_in_want || wants->exact_oid)
1135                         packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1136                 else
1137                         packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1138         }
1139 }
1140
1141 static void add_common(struct strbuf *req_buf, struct oidset *common)
1142 {
1143         struct oidset_iter iter;
1144         const struct object_id *oid;
1145         oidset_iter_init(common, &iter);
1146
1147         while ((oid = oidset_iter_next(&iter))) {
1148                 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1149         }
1150 }
1151
1152 static int add_haves(struct fetch_negotiator *negotiator,
1153                      int seen_ack,
1154                      struct strbuf *req_buf,
1155                      int *haves_to_send, int *in_vain)
1156 {
1157         int ret = 0;
1158         int haves_added = 0;
1159         const struct object_id *oid;
1160
1161         while ((oid = negotiator->next(negotiator))) {
1162                 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1163                 if (++haves_added >= *haves_to_send)
1164                         break;
1165         }
1166
1167         *in_vain += haves_added;
1168         if (!haves_added || (seen_ack && *in_vain >= MAX_IN_VAIN)) {
1169                 /* Send Done */
1170                 packet_buf_write(req_buf, "done\n");
1171                 ret = 1;
1172         }
1173
1174         /* Increase haves to send on next round */
1175         *haves_to_send = next_flush(1, *haves_to_send);
1176
1177         return ret;
1178 }
1179
1180 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1181                               struct fetch_pack_args *args,
1182                               const struct ref *wants, struct oidset *common,
1183                               int *haves_to_send, int *in_vain,
1184                               int sideband_all, int seen_ack)
1185 {
1186         int ret = 0;
1187         const char *hash_name;
1188         struct strbuf req_buf = STRBUF_INIT;
1189
1190         if (server_supports_v2("fetch", 1))
1191                 packet_buf_write(&req_buf, "command=fetch");
1192         if (server_supports_v2("agent", 0))
1193                 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1194         if (args->server_options && args->server_options->nr &&
1195             server_supports_v2("server-option", 1)) {
1196                 int i;
1197                 for (i = 0; i < args->server_options->nr; i++)
1198                         packet_buf_write(&req_buf, "server-option=%s",
1199                                          args->server_options->items[i].string);
1200         }
1201
1202         if (server_feature_v2("object-format", &hash_name)) {
1203                 int hash_algo = hash_algo_by_name(hash_name);
1204                 if (hash_algo_by_ptr(the_hash_algo) != hash_algo)
1205                         die(_("mismatched algorithms: client %s; server %s"),
1206                             the_hash_algo->name, hash_name);
1207                 packet_write_fmt(fd_out, "object-format=%s", the_hash_algo->name);
1208         } else if (hash_algo_by_ptr(the_hash_algo) != GIT_HASH_SHA1) {
1209                 die(_("the server does not support algorithm '%s'"),
1210                     the_hash_algo->name);
1211         }
1212
1213         packet_buf_delim(&req_buf);
1214         if (args->use_thin_pack)
1215                 packet_buf_write(&req_buf, "thin-pack");
1216         if (args->no_progress)
1217                 packet_buf_write(&req_buf, "no-progress");
1218         if (args->include_tag)
1219                 packet_buf_write(&req_buf, "include-tag");
1220         if (prefer_ofs_delta)
1221                 packet_buf_write(&req_buf, "ofs-delta");
1222         if (sideband_all)
1223                 packet_buf_write(&req_buf, "sideband-all");
1224
1225         /* Add shallow-info and deepen request */
1226         if (server_supports_feature("fetch", "shallow", 0))
1227                 add_shallow_requests(&req_buf, args);
1228         else if (is_repository_shallow(the_repository) || args->deepen)
1229                 die(_("Server does not support shallow requests"));
1230
1231         /* Add filter */
1232         if (server_supports_feature("fetch", "filter", 0) &&
1233             args->filter_options.choice) {
1234                 const char *spec =
1235                         expand_list_objects_filter_spec(&args->filter_options);
1236                 print_verbose(args, _("Server supports filter"));
1237                 packet_buf_write(&req_buf, "filter %s", spec);
1238         } else if (args->filter_options.choice) {
1239                 warning("filtering not recognized by server, ignoring");
1240         }
1241
1242         if (server_supports_feature("fetch", "packfile-uris", 0)) {
1243                 int i;
1244                 struct strbuf to_send = STRBUF_INIT;
1245
1246                 for (i = 0; i < uri_protocols.nr; i++) {
1247                         const char *s = uri_protocols.items[i].string;
1248
1249                         if (!strcmp(s, "https") || !strcmp(s, "http")) {
1250                                 if (to_send.len)
1251                                         strbuf_addch(&to_send, ',');
1252                                 strbuf_addstr(&to_send, s);
1253                         }
1254                 }
1255                 if (to_send.len) {
1256                         packet_buf_write(&req_buf, "packfile-uris %s",
1257                                          to_send.buf);
1258                         strbuf_release(&to_send);
1259                 }
1260         }
1261
1262         /* add wants */
1263         add_wants(wants, &req_buf);
1264
1265         /* Add all of the common commits we've found in previous rounds */
1266         add_common(&req_buf, common);
1267
1268         /* Add initial haves */
1269         ret = add_haves(negotiator, seen_ack, &req_buf,
1270                         haves_to_send, in_vain);
1271
1272         /* Send request */
1273         packet_buf_flush(&req_buf);
1274         if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
1275                 die_errno(_("unable to write request to remote"));
1276
1277         strbuf_release(&req_buf);
1278         return ret;
1279 }
1280
1281 /*
1282  * Processes a section header in a server's response and checks if it matches
1283  * `section`.  If the value of `peek` is 1, the header line will be peeked (and
1284  * not consumed); if 0, the line will be consumed and the function will die if
1285  * the section header doesn't match what was expected.
1286  */
1287 static int process_section_header(struct packet_reader *reader,
1288                                   const char *section, int peek)
1289 {
1290         int ret;
1291
1292         if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1293                 die(_("error reading section header '%s'"), section);
1294
1295         ret = !strcmp(reader->line, section);
1296
1297         if (!peek) {
1298                 if (!ret)
1299                         die(_("expected '%s', received '%s'"),
1300                             section, reader->line);
1301                 packet_reader_read(reader);
1302         }
1303
1304         return ret;
1305 }
1306
1307 enum common_found {
1308         /*
1309          * No commit was found to be possessed by both the client and the
1310          * server, and "ready" was not received.
1311          */
1312         NO_COMMON_FOUND,
1313
1314         /*
1315          * At least one commit was found to be possessed by both the client and
1316          * the server, and "ready" was not received.
1317          */
1318         COMMON_FOUND,
1319
1320         /*
1321          * "ready" was received, indicating that the server is ready to send
1322          * the packfile without any further negotiation.
1323          */
1324         READY
1325 };
1326
1327 static enum common_found process_acks(struct fetch_negotiator *negotiator,
1328                                       struct packet_reader *reader,
1329                                       struct oidset *common)
1330 {
1331         /* received */
1332         int received_ready = 0;
1333         int received_ack = 0;
1334
1335         process_section_header(reader, "acknowledgments", 0);
1336         while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1337                 const char *arg;
1338
1339                 if (!strcmp(reader->line, "NAK"))
1340                         continue;
1341
1342                 if (skip_prefix(reader->line, "ACK ", &arg)) {
1343                         struct object_id oid;
1344                         received_ack = 1;
1345                         if (!get_oid_hex(arg, &oid)) {
1346                                 struct commit *commit;
1347                                 oidset_insert(common, &oid);
1348                                 commit = lookup_commit(the_repository, &oid);
1349                                 if (negotiator)
1350                                         negotiator->ack(negotiator, commit);
1351                         }
1352                         continue;
1353                 }
1354
1355                 if (!strcmp(reader->line, "ready")) {
1356                         received_ready = 1;
1357                         continue;
1358                 }
1359
1360                 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1361         }
1362
1363         if (reader->status != PACKET_READ_FLUSH &&
1364             reader->status != PACKET_READ_DELIM)
1365                 die(_("error processing acks: %d"), reader->status);
1366
1367         /*
1368          * If an "acknowledgments" section is sent, a packfile is sent if and
1369          * only if "ready" was sent in this section. The other sections
1370          * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1371          * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1372          * otherwise.
1373          */
1374         if (received_ready && reader->status != PACKET_READ_DELIM)
1375                 die(_("expected packfile to be sent after 'ready'"));
1376         if (!received_ready && reader->status != PACKET_READ_FLUSH)
1377                 die(_("expected no other sections to be sent after no 'ready'"));
1378
1379         return received_ready ? READY :
1380                 (received_ack ? COMMON_FOUND : NO_COMMON_FOUND);
1381 }
1382
1383 static void receive_shallow_info(struct fetch_pack_args *args,
1384                                  struct packet_reader *reader,
1385                                  struct oid_array *shallows,
1386                                  struct shallow_info *si)
1387 {
1388         int unshallow_received = 0;
1389
1390         process_section_header(reader, "shallow-info", 0);
1391         while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1392                 const char *arg;
1393                 struct object_id oid;
1394
1395                 if (skip_prefix(reader->line, "shallow ", &arg)) {
1396                         if (get_oid_hex(arg, &oid))
1397                                 die(_("invalid shallow line: %s"), reader->line);
1398                         oid_array_append(shallows, &oid);
1399                         continue;
1400                 }
1401                 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1402                         if (get_oid_hex(arg, &oid))
1403                                 die(_("invalid unshallow line: %s"), reader->line);
1404                         if (!lookup_object(the_repository, &oid))
1405                                 die(_("object not found: %s"), reader->line);
1406                         /* make sure that it is parsed as shallow */
1407                         if (!parse_object(the_repository, &oid))
1408                                 die(_("error in object: %s"), reader->line);
1409                         if (unregister_shallow(&oid))
1410                                 die(_("no shallow found: %s"), reader->line);
1411                         unshallow_received = 1;
1412                         continue;
1413                 }
1414                 die(_("expected shallow/unshallow, got %s"), reader->line);
1415         }
1416
1417         if (reader->status != PACKET_READ_FLUSH &&
1418             reader->status != PACKET_READ_DELIM)
1419                 die(_("error processing shallow info: %d"), reader->status);
1420
1421         if (args->deepen || unshallow_received) {
1422                 /*
1423                  * Treat these as shallow lines caused by our depth settings.
1424                  * In v0, these lines cannot cause refs to be rejected; do the
1425                  * same.
1426                  */
1427                 int i;
1428
1429                 for (i = 0; i < shallows->nr; i++)
1430                         register_shallow(the_repository, &shallows->oid[i]);
1431                 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1432                                         NULL);
1433                 args->deepen = 1;
1434         } else if (shallows->nr) {
1435                 /*
1436                  * Treat these as shallow lines caused by the remote being
1437                  * shallow. In v0, remote refs that reach these objects are
1438                  * rejected (unless --update-shallow is set); do the same.
1439                  */
1440                 prepare_shallow_info(si, shallows);
1441                 if (si->nr_ours || si->nr_theirs)
1442                         alternate_shallow_file =
1443                                 setup_temporary_shallow(si->shallow);
1444                 else
1445                         alternate_shallow_file = NULL;
1446         } else {
1447                 alternate_shallow_file = NULL;
1448         }
1449 }
1450
1451 static int cmp_name_ref(const void *name, const void *ref)
1452 {
1453         return strcmp(name, (*(struct ref **)ref)->name);
1454 }
1455
1456 static void receive_wanted_refs(struct packet_reader *reader,
1457                                 struct ref **sought, int nr_sought)
1458 {
1459         process_section_header(reader, "wanted-refs", 0);
1460         while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1461                 struct object_id oid;
1462                 const char *end;
1463                 struct ref **found;
1464
1465                 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1466                         die(_("expected wanted-ref, got '%s'"), reader->line);
1467
1468                 found = bsearch(end, sought, nr_sought, sizeof(*sought),
1469                                 cmp_name_ref);
1470                 if (!found)
1471                         die(_("unexpected wanted-ref: '%s'"), reader->line);
1472                 oidcpy(&(*found)->old_oid, &oid);
1473         }
1474
1475         if (reader->status != PACKET_READ_DELIM)
1476                 die(_("error processing wanted refs: %d"), reader->status);
1477 }
1478
1479 static void receive_packfile_uris(struct packet_reader *reader,
1480                                   struct string_list *uris)
1481 {
1482         process_section_header(reader, "packfile-uris", 0);
1483         while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1484                 if (reader->pktlen < the_hash_algo->hexsz ||
1485                     reader->line[the_hash_algo->hexsz] != ' ')
1486                         die("expected '<hash> <uri>', got: %s\n", reader->line);
1487
1488                 string_list_append(uris, reader->line);
1489         }
1490         if (reader->status != PACKET_READ_DELIM)
1491                 die("expected DELIM");
1492 }
1493
1494 enum fetch_state {
1495         FETCH_CHECK_LOCAL = 0,
1496         FETCH_SEND_REQUEST,
1497         FETCH_PROCESS_ACKS,
1498         FETCH_GET_PACK,
1499         FETCH_DONE,
1500 };
1501
1502 static void do_check_stateless_delimiter(const struct fetch_pack_args *args,
1503                                          struct packet_reader *reader)
1504 {
1505         check_stateless_delimiter(args->stateless_rpc, reader,
1506                                   _("git fetch-pack: expected response end packet"));
1507 }
1508
1509 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1510                                     int fd[2],
1511                                     const struct ref *orig_ref,
1512                                     struct ref **sought, int nr_sought,
1513                                     struct oid_array *shallows,
1514                                     struct shallow_info *si,
1515                                     struct string_list *pack_lockfiles)
1516 {
1517         struct repository *r = the_repository;
1518         struct ref *ref = copy_ref_list(orig_ref);
1519         enum fetch_state state = FETCH_CHECK_LOCAL;
1520         struct oidset common = OIDSET_INIT;
1521         struct packet_reader reader;
1522         int in_vain = 0, negotiation_started = 0;
1523         int haves_to_send = INITIAL_FLUSH;
1524         struct fetch_negotiator negotiator_alloc;
1525         struct fetch_negotiator *negotiator;
1526         int seen_ack = 0;
1527         struct string_list packfile_uris = STRING_LIST_INIT_DUP;
1528         int i;
1529
1530         negotiator = &negotiator_alloc;
1531         fetch_negotiator_init(r, negotiator);
1532
1533         packet_reader_init(&reader, fd[0], NULL, 0,
1534                            PACKET_READ_CHOMP_NEWLINE |
1535                            PACKET_READ_DIE_ON_ERR_PACKET);
1536         if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) &&
1537             server_supports_feature("fetch", "sideband-all", 0)) {
1538                 reader.use_sideband = 1;
1539                 reader.me = "fetch-pack";
1540         }
1541
1542         while (state != FETCH_DONE) {
1543                 switch (state) {
1544                 case FETCH_CHECK_LOCAL:
1545                         sort_ref_list(&ref, ref_compare_name);
1546                         QSORT(sought, nr_sought, cmp_ref_by_name);
1547
1548                         /* v2 supports these by default */
1549                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1550                         use_sideband = 2;
1551                         if (args->depth > 0 || args->deepen_since || args->deepen_not)
1552                                 args->deepen = 1;
1553
1554                         /* Filter 'ref' by 'sought' and those that aren't local */
1555                         mark_complete_and_common_ref(negotiator, args, &ref);
1556                         filter_refs(args, &ref, sought, nr_sought);
1557                         if (everything_local(args, &ref))
1558                                 state = FETCH_DONE;
1559                         else
1560                                 state = FETCH_SEND_REQUEST;
1561
1562                         mark_tips(negotiator, args->negotiation_tips);
1563                         for_each_cached_alternate(negotiator,
1564                                                   insert_one_alternate_object);
1565                         break;
1566                 case FETCH_SEND_REQUEST:
1567                         if (!negotiation_started) {
1568                                 negotiation_started = 1;
1569                                 trace2_region_enter("fetch-pack",
1570                                                     "negotiation_v2",
1571                                                     the_repository);
1572                         }
1573                         if (send_fetch_request(negotiator, fd[1], args, ref,
1574                                                &common,
1575                                                &haves_to_send, &in_vain,
1576                                                reader.use_sideband,
1577                                                seen_ack))
1578                                 state = FETCH_GET_PACK;
1579                         else
1580                                 state = FETCH_PROCESS_ACKS;
1581                         break;
1582                 case FETCH_PROCESS_ACKS:
1583                         /* Process ACKs/NAKs */
1584                         switch (process_acks(negotiator, &reader, &common)) {
1585                         case READY:
1586                                 /*
1587                                  * Don't check for response delimiter; get_pack() will
1588                                  * read the rest of this response.
1589                                  */
1590                                 state = FETCH_GET_PACK;
1591                                 break;
1592                         case COMMON_FOUND:
1593                                 in_vain = 0;
1594                                 seen_ack = 1;
1595                                 /* fallthrough */
1596                         case NO_COMMON_FOUND:
1597                                 do_check_stateless_delimiter(args, &reader);
1598                                 state = FETCH_SEND_REQUEST;
1599                                 break;
1600                         }
1601                         break;
1602                 case FETCH_GET_PACK:
1603                         trace2_region_leave("fetch-pack",
1604                                             "negotiation_v2",
1605                                             the_repository);
1606                         /* Check for shallow-info section */
1607                         if (process_section_header(&reader, "shallow-info", 1))
1608                                 receive_shallow_info(args, &reader, shallows, si);
1609
1610                         if (process_section_header(&reader, "wanted-refs", 1))
1611                                 receive_wanted_refs(&reader, sought, nr_sought);
1612
1613                         /* get the pack(s) */
1614                         if (process_section_header(&reader, "packfile-uris", 1))
1615                                 receive_packfile_uris(&reader, &packfile_uris);
1616                         process_section_header(&reader, "packfile", 0);
1617                         if (get_pack(args, fd, pack_lockfiles,
1618                                      !packfile_uris.nr, sought, nr_sought))
1619                                 die(_("git fetch-pack: fetch failed."));
1620                         do_check_stateless_delimiter(args, &reader);
1621
1622                         state = FETCH_DONE;
1623                         break;
1624                 case FETCH_DONE:
1625                         continue;
1626                 }
1627         }
1628
1629         for (i = 0; i < packfile_uris.nr; i++) {
1630                 struct child_process cmd = CHILD_PROCESS_INIT;
1631                 char packname[GIT_MAX_HEXSZ + 1];
1632                 const char *uri = packfile_uris.items[i].string +
1633                         the_hash_algo->hexsz + 1;
1634
1635                 strvec_push(&cmd.args, "http-fetch");
1636                 strvec_pushf(&cmd.args, "--packfile=%.*s",
1637                              (int) the_hash_algo->hexsz,
1638                              packfile_uris.items[i].string);
1639                 strvec_push(&cmd.args, uri);
1640                 cmd.git_cmd = 1;
1641                 cmd.no_stdin = 1;
1642                 cmd.out = -1;
1643                 if (start_command(&cmd))
1644                         die("fetch-pack: unable to spawn http-fetch");
1645
1646                 if (read_in_full(cmd.out, packname, 5) < 0 ||
1647                     memcmp(packname, "keep\t", 5))
1648                         die("fetch-pack: expected keep then TAB at start of http-fetch output");
1649
1650                 if (read_in_full(cmd.out, packname,
1651                                  the_hash_algo->hexsz + 1) < 0 ||
1652                     packname[the_hash_algo->hexsz] != '\n')
1653                         die("fetch-pack: expected hash then LF at end of http-fetch output");
1654
1655                 packname[the_hash_algo->hexsz] = '\0';
1656
1657                 close(cmd.out);
1658
1659                 if (finish_command(&cmd))
1660                         die("fetch-pack: unable to finish http-fetch");
1661
1662                 if (memcmp(packfile_uris.items[i].string, packname,
1663                            the_hash_algo->hexsz))
1664                         die("fetch-pack: pack downloaded from %s does not match expected hash %.*s",
1665                             uri, (int) the_hash_algo->hexsz,
1666                             packfile_uris.items[i].string);
1667
1668                 string_list_append_nodup(pack_lockfiles,
1669                                          xstrfmt("%s/pack/pack-%s.keep",
1670                                                  get_object_directory(),
1671                                                  packname));
1672         }
1673         string_list_clear(&packfile_uris, 0);
1674
1675         if (negotiator)
1676                 negotiator->release(negotiator);
1677
1678         oidset_clear(&common);
1679         return ref;
1680 }
1681
1682 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1683 {
1684         if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1685                 const char *path;
1686
1687                 if (git_config_pathname(&path, var, value))
1688                         return 1;
1689                 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1690                         fsck_msg_types.len ? ',' : '=', path);
1691                 free((char *)path);
1692                 return 0;
1693         }
1694
1695         if (skip_prefix(var, "fetch.fsck.", &var)) {
1696                 if (is_valid_msg_type(var, value))
1697                         strbuf_addf(&fsck_msg_types, "%c%s=%s",
1698                                 fsck_msg_types.len ? ',' : '=', var, value);
1699                 else
1700                         warning("Skipping unknown msg id '%s'", var);
1701                 return 0;
1702         }
1703
1704         return git_default_config(var, value, cb);
1705 }
1706
1707 static void fetch_pack_config(void)
1708 {
1709         git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1710         git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1711         git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1712         git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1713         git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1714         if (!uri_protocols.nr) {
1715                 char *str;
1716
1717                 if (!git_config_get_string("fetch.uriprotocols", &str) && str) {
1718                         string_list_split(&uri_protocols, str, ',', -1);
1719                         free(str);
1720                 }
1721         }
1722
1723         git_config(fetch_pack_config_cb, NULL);
1724 }
1725
1726 static void fetch_pack_setup(void)
1727 {
1728         static int did_setup;
1729         if (did_setup)
1730                 return;
1731         fetch_pack_config();
1732         if (0 <= transfer_unpack_limit)
1733                 unpack_limit = transfer_unpack_limit;
1734         else if (0 <= fetch_unpack_limit)
1735                 unpack_limit = fetch_unpack_limit;
1736         did_setup = 1;
1737 }
1738
1739 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1740 {
1741         struct string_list names = STRING_LIST_INIT_NODUP;
1742         int src, dst;
1743
1744         for (src = dst = 0; src < nr; src++) {
1745                 struct string_list_item *item;
1746                 item = string_list_insert(&names, ref[src]->name);
1747                 if (item->util)
1748                         continue; /* already have it */
1749                 item->util = ref[src];
1750                 if (src != dst)
1751                         ref[dst] = ref[src];
1752                 dst++;
1753         }
1754         for (src = dst; src < nr; src++)
1755                 ref[src] = NULL;
1756         string_list_clear(&names, 0);
1757         return dst;
1758 }
1759
1760 static void update_shallow(struct fetch_pack_args *args,
1761                            struct ref **sought, int nr_sought,
1762                            struct shallow_info *si)
1763 {
1764         struct oid_array ref = OID_ARRAY_INIT;
1765         int *status;
1766         int i;
1767
1768         if (args->deepen && alternate_shallow_file) {
1769                 if (*alternate_shallow_file == '\0') { /* --unshallow */
1770                         unlink_or_warn(git_path_shallow(the_repository));
1771                         rollback_shallow_file(the_repository, &shallow_lock);
1772                 } else
1773                         commit_shallow_file(the_repository, &shallow_lock);
1774                 alternate_shallow_file = NULL;
1775                 return;
1776         }
1777
1778         if (!si->shallow || !si->shallow->nr)
1779                 return;
1780
1781         if (args->cloning) {
1782                 /*
1783                  * remote is shallow, but this is a clone, there are
1784                  * no objects in repo to worry about. Accept any
1785                  * shallow points that exist in the pack (iow in repo
1786                  * after get_pack() and reprepare_packed_git())
1787                  */
1788                 struct oid_array extra = OID_ARRAY_INIT;
1789                 struct object_id *oid = si->shallow->oid;
1790                 for (i = 0; i < si->shallow->nr; i++)
1791                         if (has_object_file(&oid[i]))
1792                                 oid_array_append(&extra, &oid[i]);
1793                 if (extra.nr) {
1794                         setup_alternate_shallow(&shallow_lock,
1795                                                 &alternate_shallow_file,
1796                                                 &extra);
1797                         commit_shallow_file(the_repository, &shallow_lock);
1798                         alternate_shallow_file = NULL;
1799                 }
1800                 oid_array_clear(&extra);
1801                 return;
1802         }
1803
1804         if (!si->nr_ours && !si->nr_theirs)
1805                 return;
1806
1807         remove_nonexistent_theirs_shallow(si);
1808         if (!si->nr_ours && !si->nr_theirs)
1809                 return;
1810         for (i = 0; i < nr_sought; i++)
1811                 oid_array_append(&ref, &sought[i]->old_oid);
1812         si->ref = &ref;
1813
1814         if (args->update_shallow) {
1815                 /*
1816                  * remote is also shallow, .git/shallow may be updated
1817                  * so all refs can be accepted. Make sure we only add
1818                  * shallow roots that are actually reachable from new
1819                  * refs.
1820                  */
1821                 struct oid_array extra = OID_ARRAY_INIT;
1822                 struct object_id *oid = si->shallow->oid;
1823                 assign_shallow_commits_to_refs(si, NULL, NULL);
1824                 if (!si->nr_ours && !si->nr_theirs) {
1825                         oid_array_clear(&ref);
1826                         return;
1827                 }
1828                 for (i = 0; i < si->nr_ours; i++)
1829                         oid_array_append(&extra, &oid[si->ours[i]]);
1830                 for (i = 0; i < si->nr_theirs; i++)
1831                         oid_array_append(&extra, &oid[si->theirs[i]]);
1832                 setup_alternate_shallow(&shallow_lock,
1833                                         &alternate_shallow_file,
1834                                         &extra);
1835                 commit_shallow_file(the_repository, &shallow_lock);
1836                 oid_array_clear(&extra);
1837                 oid_array_clear(&ref);
1838                 alternate_shallow_file = NULL;
1839                 return;
1840         }
1841
1842         /*
1843          * remote is also shallow, check what ref is safe to update
1844          * without updating .git/shallow
1845          */
1846         status = xcalloc(nr_sought, sizeof(*status));
1847         assign_shallow_commits_to_refs(si, NULL, status);
1848         if (si->nr_ours || si->nr_theirs) {
1849                 for (i = 0; i < nr_sought; i++)
1850                         if (status[i])
1851                                 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1852         }
1853         free(status);
1854         oid_array_clear(&ref);
1855 }
1856
1857 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1858 {
1859         struct ref **rm = cb_data;
1860         struct ref *ref = *rm;
1861
1862         if (!ref)
1863                 return -1; /* end of the list */
1864         *rm = ref->next;
1865         oidcpy(oid, &ref->old_oid);
1866         return 0;
1867 }
1868
1869 struct ref *fetch_pack(struct fetch_pack_args *args,
1870                        int fd[],
1871                        const struct ref *ref,
1872                        struct ref **sought, int nr_sought,
1873                        struct oid_array *shallow,
1874                        struct string_list *pack_lockfiles,
1875                        enum protocol_version version)
1876 {
1877         struct ref *ref_cpy;
1878         struct shallow_info si;
1879         struct oid_array shallows_scratch = OID_ARRAY_INIT;
1880
1881         fetch_pack_setup();
1882         if (nr_sought)
1883                 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1884
1885         if (version != protocol_v2 && !ref) {
1886                 packet_flush(fd[1]);
1887                 die(_("no matching remote head"));
1888         }
1889         if (version == protocol_v2) {
1890                 if (shallow->nr)
1891                         BUG("Protocol V2 does not provide shallows at this point in the fetch");
1892                 memset(&si, 0, sizeof(si));
1893                 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1894                                            &shallows_scratch, &si,
1895                                            pack_lockfiles);
1896         } else {
1897                 prepare_shallow_info(&si, shallow);
1898                 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1899                                         &si, pack_lockfiles);
1900         }
1901         reprepare_packed_git(the_repository);
1902
1903         if (!args->cloning && args->deepen) {
1904                 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1905                 struct ref *iterator = ref_cpy;
1906                 opt.shallow_file = alternate_shallow_file;
1907                 if (args->deepen)
1908                         opt.is_deepening_fetch = 1;
1909                 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1910                         error(_("remote did not send all necessary objects"));
1911                         free_refs(ref_cpy);
1912                         ref_cpy = NULL;
1913                         rollback_shallow_file(the_repository, &shallow_lock);
1914                         goto cleanup;
1915                 }
1916                 args->connectivity_checked = 1;
1917         }
1918
1919         update_shallow(args, sought, nr_sought, &si);
1920 cleanup:
1921         clear_shallow_info(&si);
1922         oid_array_clear(&shallows_scratch);
1923         return ref_cpy;
1924 }
1925
1926 int report_unmatched_refs(struct ref **sought, int nr_sought)
1927 {
1928         int i, ret = 0;
1929
1930         for (i = 0; i < nr_sought; i++) {
1931                 if (!sought[i])
1932                         continue;
1933                 switch (sought[i]->match_status) {
1934                 case REF_MATCHED:
1935                         continue;
1936                 case REF_NOT_MATCHED:
1937                         error(_("no such remote ref %s"), sought[i]->name);
1938                         break;
1939                 case REF_UNADVERTISED_NOT_ALLOWED:
1940                         error(_("Server does not allow request for unadvertised object %s"),
1941                               sought[i]->name);
1942                         break;
1943                 }
1944                 ret = 1;
1945         }
1946         return ret;
1947 }