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 int advertise_sid;
  39 static struct shallow_lock shallow_lock;
  40 static const char *alternate_shallow_file;
  41 static struct strbuf fsck_msg_types = STRBUF_INIT;
  42 static struct string_list uri_protocols = STRING_LIST_INIT_DUP;
  43
  44 /* Remember to update object flag allocation in object.h */
  45 #define COMPLETE        (1U << 0)
  46 #define ALTERNATE       (1U << 1)
  47
  48 /*
  49  * After sending this many "have"s if we do not get any new ACK , we
  50  * give up traversing our history.
  51  */
  52 #define MAX_IN_VAIN 256
  53
  54 static int multi_ack, use_sideband;
  55 /* Allow specifying sha1 if it is a ref tip. */
  56 #define ALLOW_TIP_SHA1  01
  57 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  58 #define ALLOW_REACHABLE_SHA1    02
  59 static unsigned int allow_unadvertised_object_request;
  60
  61 __attribute__((format (printf, 2, 3)))
  62 static inline void print_verbose(const struct fetch_pack_args *args,
  63                                  const char *fmt, ...)
  64 {
  65         va_list params;
  66
  67         if (!args->verbose)
  68                 return;
  69
  70         va_start(params, fmt);
  71         vfprintf(stderr, fmt, params);
  72         va_end(params);
  73         fputc('\n', stderr);
  74 }
  75
  76 struct alternate_object_cache {
  77         struct object **items;
  78         size_t nr, alloc;
  79 };
  80
  81 static void cache_one_alternate(const struct object_id *oid,
  82                                 void *vcache)
  83 {
  84         struct alternate_object_cache *cache = vcache;
  85         struct object *obj = parse_object(the_repository, oid);
  86
  87         if (!obj || (obj->flags & ALTERNATE))
  88                 return;
  89
  90         obj->flags |= ALTERNATE;
  91         ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc);
  92         cache->items[cache->nr++] = obj;
  93 }
  94
  95 static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
  96                                       void (*cb)(struct fetch_negotiator *,
  97                                                  struct object *))
  98 {
  99         static int initialized;
 100         static struct alternate_object_cache cache;
 101         size_t i;
 102
 103         if (!initialized) {
 104                 for_each_alternate_ref(cache_one_alternate, &cache);
 105                 initialized = 1;
 106         }
 107
 108         for (i = 0; i < cache.nr; i++)
 109                 cb(negotiator, cache.items[i]);
 110 }
 111
 112 static struct commit *deref_without_lazy_fetch(const struct object_id *oid,
 113                                                int mark_tags_complete)
 114 {
 115         enum object_type type;
 116         struct object_info info = { .typep = &type };
 117
 118         while (1) {
 119                 if (oid_object_info_extended(the_repository, oid, &info,
 120                                              OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK))
 121                         return NULL;
 122                 if (type == OBJ_TAG) {
 123                         struct tag *tag = (struct tag *)
 124                                 parse_object(the_repository, oid);
 125
 126                         if (!tag->tagged)
 127                                 return NULL;
 128                         if (mark_tags_complete)
 129                                 tag->object.flags |= COMPLETE;
 130                         oid = &tag->tagged->oid;
 131                 } else {
 132                         break;
 133                 }
 134         }
 135         if (type == OBJ_COMMIT)
 136                 return (struct commit *) parse_object(the_repository, oid);
 137         return NULL;
 138 }
 139
 140 static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
 141                                const struct object_id *oid)
 142 {
 143         struct commit *c = deref_without_lazy_fetch(oid, 0);
 144
 145         if (c)
 146                 negotiator->add_tip(negotiator, c);
 147         return 0;
 148 }
 149
 150 static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
 151                                    int flag, void *cb_data)
 152 {
 153         return rev_list_insert_ref(cb_data, oid);
 154 }
 155
 156 enum ack_type {
 157         NAK = 0,
 158         ACK,
 159         ACK_continue,
 160         ACK_common,
 161         ACK_ready
 162 };
 163
 164 static void consume_shallow_list(struct fetch_pack_args *args,
 165                                  struct packet_reader *reader)
 166 {
 167         if (args->stateless_rpc && args->deepen) {
 168                 /* If we sent a depth we will get back "duplicate"
 169                  * shallow and unshallow commands every time there
 170                  * is a block of have lines exchanged.
 171                  */
 172                 while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
 173                         if (starts_with(reader->line, "shallow "))
 174                                 continue;
 175                         if (starts_with(reader->line, "unshallow "))
 176                                 continue;
 177                         die(_("git fetch-pack: expected shallow list"));
 178                 }
 179                 if (reader->status != PACKET_READ_FLUSH)
 180                         die(_("git fetch-pack: expected a flush packet after shallow list"));
 181         }
 182 }
 183
 184 static enum ack_type get_ack(struct packet_reader *reader,
 185                              struct object_id *result_oid)
 186 {
 187         int len;
 188         const char *arg;
 189
 190         if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 191                 die(_("git fetch-pack: expected ACK/NAK, got a flush packet"));
 192         len = reader->pktlen;
 193
 194         if (!strcmp(reader->line, "NAK"))
 195                 return NAK;
 196         if (skip_prefix(reader->line, "ACK ", &arg)) {
 197                 const char *p;
 198                 if (!parse_oid_hex(arg, result_oid, &p)) {
 199                         len -= p - reader->line;
 200                         if (len < 1)
 201                                 return ACK;
 202                         if (strstr(p, "continue"))
 203                                 return ACK_continue;
 204                         if (strstr(p, "common"))
 205                                 return ACK_common;
 206                         if (strstr(p, "ready"))
 207                                 return ACK_ready;
 208                         return ACK;
 209                 }
 210         }
 211         die(_("git fetch-pack: expected ACK/NAK, got '%s'"), reader->line);
 212 }
 213
 214 static void send_request(struct fetch_pack_args *args,
 215                          int fd, struct strbuf *buf)
 216 {
 217         if (args->stateless_rpc) {
 218                 send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX);
 219                 packet_flush(fd);
 220         } else {
 221                 if (write_in_full(fd, buf->buf, buf->len) < 0)
 222                         die_errno(_("unable to write to remote"));
 223         }
 224 }
 225
 226 static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
 227                                         struct object *obj)
 228 {
 229         rev_list_insert_ref(negotiator, &obj->oid);
 230 }
 231
 232 #define INITIAL_FLUSH 16
 233 #define PIPESAFE_FLUSH 32
 234 #define LARGE_FLUSH 16384
 235
 236 static int next_flush(int stateless_rpc, int count)
 237 {
 238         if (stateless_rpc) {
 239                 if (count < LARGE_FLUSH)
 240                         count <<= 1;
 241                 else
 242                         count = count * 11 / 10;
 243         } else {
 244                 if (count < PIPESAFE_FLUSH)
 245                         count <<= 1;
 246                 else
 247                         count += PIPESAFE_FLUSH;
 248         }
 249         return count;
 250 }
 251
 252 static void mark_tips(struct fetch_negotiator *negotiator,
 253                       const struct oid_array *negotiation_tips)
 254 {
 255         int i;
 256
 257         if (!negotiation_tips) {
 258                 for_each_rawref(rev_list_insert_ref_oid, negotiator);
 259                 return;
 260         }
 261
 262         for (i = 0; i < negotiation_tips->nr; i++)
 263                 rev_list_insert_ref(negotiator, &negotiation_tips->oid[i]);
 264         return;
 265 }
 266
 267 static int find_common(struct fetch_negotiator *negotiator,
 268                        struct fetch_pack_args *args,
 269                        int fd[2], struct object_id *result_oid,
 270                        struct ref *refs)
 271 {
 272         int fetching;
 273         int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
 274         const struct object_id *oid;
 275         unsigned in_vain = 0;
 276         int got_continue = 0;
 277         int got_ready = 0;
 278         struct strbuf req_buf = STRBUF_INIT;
 279         size_t state_len = 0;
 280         struct packet_reader reader;
 281
 282         if (args->stateless_rpc && multi_ack == 1)
 283                 die(_("--stateless-rpc requires multi_ack_detailed"));
 284
 285         packet_reader_init(&reader, fd[0], NULL, 0,
 286                            PACKET_READ_CHOMP_NEWLINE |
 287                            PACKET_READ_DIE_ON_ERR_PACKET);
 288
 289         mark_tips(negotiator, args->negotiation_tips);
 290         for_each_cached_alternate(negotiator, insert_one_alternate_object);
 291
 292         fetching = 0;
 293         for ( ; refs ; refs = refs->next) {
 294                 struct object_id *remote = &refs->old_oid;
 295                 const char *remote_hex;
 296                 struct object *o;
 297
 298                 /*
 299                  * If that object is complete (i.e. it is an ancestor of a
 300                  * local ref), we tell them we have it but do not have to
 301                  * tell them about its ancestors, which they already know
 302                  * about.
 303                  *
 304                  * We use lookup_object here because we are only
 305                  * interested in the case we *know* the object is
 306                  * reachable and we have already scanned it.
 307                  */
 308                 if (((o = lookup_object(the_repository, remote)) != NULL) &&
 309                                 (o->flags & COMPLETE)) {
 310                         continue;
 311                 }
 312
 313                 remote_hex = oid_to_hex(remote);
 314                 if (!fetching) {
 315                         struct strbuf c = STRBUF_INIT;
 316                         if (multi_ack == 2)     strbuf_addstr(&c, " multi_ack_detailed");
 317                         if (multi_ack == 1)     strbuf_addstr(&c, " multi_ack");
 318                         if (no_done)            strbuf_addstr(&c, " no-done");
 319                         if (use_sideband == 2)  strbuf_addstr(&c, " side-band-64k");
 320                         if (use_sideband == 1)  strbuf_addstr(&c, " side-band");
 321                         if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative");
 322                         if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack");
 323                         if (args->no_progress)   strbuf_addstr(&c, " no-progress");
 324                         if (args->include_tag)   strbuf_addstr(&c, " include-tag");
 325                         if (prefer_ofs_delta)   strbuf_addstr(&c, " ofs-delta");
 326                         if (deepen_since_ok)    strbuf_addstr(&c, " deepen-since");
 327                         if (deepen_not_ok)      strbuf_addstr(&c, " deepen-not");
 328                         if (agent_supported)    strbuf_addf(&c, " agent=%s",
 329                                                             git_user_agent_sanitized());
 330                         if (advertise_sid)
 331                                 strbuf_addf(&c, " session-id=%s", trace2_session_id());
 332                         if (args->filter_options.choice)
 333                                 strbuf_addstr(&c, " filter");
 334                         packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
 335                         strbuf_release(&c);
 336                 } else
 337                         packet_buf_write(&req_buf, "want %s\n", remote_hex);
 338                 fetching++;
 339         }
 340
 341         if (!fetching) {
 342                 strbuf_release(&req_buf);
 343                 packet_flush(fd[1]);
 344                 return 1;
 345         }
 346
 347         if (is_repository_shallow(the_repository))
 348                 write_shallow_commits(&req_buf, 1, NULL);
 349         if (args->depth > 0)
 350                 packet_buf_write(&req_buf, "deepen %d", args->depth);
 351         if (args->deepen_since) {
 352                 timestamp_t max_age = approxidate(args->deepen_since);
 353                 packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age);
 354         }
 355         if (args->deepen_not) {
 356                 int i;
 357                 for (i = 0; i < args->deepen_not->nr; i++) {
 358                         struct string_list_item *s = args->deepen_not->items + i;
 359                         packet_buf_write(&req_buf, "deepen-not %s", s->string);
 360                 }
 361         }
 362         if (server_supports_filtering && args->filter_options.choice) {
 363                 const char *spec =
 364                         expand_list_objects_filter_spec(&args->filter_options);
 365                 packet_buf_write(&req_buf, "filter %s", spec);
 366         }
 367         packet_buf_flush(&req_buf);
 368         state_len = req_buf.len;
 369
 370         if (args->deepen) {
 371                 const char *arg;
 372                 struct object_id oid;
 373
 374                 send_request(args, fd[1], &req_buf);
 375                 while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
 376                         if (skip_prefix(reader.line, "shallow ", &arg)) {
 377                                 if (get_oid_hex(arg, &oid))
 378                                         die(_("invalid shallow line: %s"), reader.line);
 379                                 register_shallow(the_repository, &oid);
 380                                 continue;
 381                         }
 382                         if (skip_prefix(reader.line, "unshallow ", &arg)) {
 383                                 if (get_oid_hex(arg, &oid))
 384                                         die(_("invalid unshallow line: %s"), reader.line);
 385                                 if (!lookup_object(the_repository, &oid))
 386                                         die(_("object not found: %s"), reader.line);
 387                                 /* make sure that it is parsed as shallow */
 388                                 if (!parse_object(the_repository, &oid))
 389                                         die(_("error in object: %s"), reader.line);
 390                                 if (unregister_shallow(&oid))
 391                                         die(_("no shallow found: %s"), reader.line);
 392                                 continue;
 393                         }
 394                         die(_("expected shallow/unshallow, got %s"), reader.line);
 395                 }
 396         } else if (!args->stateless_rpc)
 397                 send_request(args, fd[1], &req_buf);
 398
 399         if (!args->stateless_rpc) {
 400                 /* If we aren't using the stateless-rpc interface
 401                  * we don't need to retain the headers.
 402                  */
 403                 strbuf_setlen(&req_buf, 0);
 404                 state_len = 0;
 405         }
 406
 407         trace2_region_enter("fetch-pack", "negotiation_v0_v1", the_repository);
 408         flushes = 0;
 409         retval = -1;
 410         while ((oid = negotiator->next(negotiator))) {
 411                 packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid));
 412                 print_verbose(args, "have %s", oid_to_hex(oid));
 413                 in_vain++;
 414                 if (flush_at <= ++count) {
 415                         int ack;
 416
 417                         packet_buf_flush(&req_buf);
 418                         send_request(args, fd[1], &req_buf);
 419                         strbuf_setlen(&req_buf, state_len);
 420                         flushes++;
 421                         flush_at = next_flush(args->stateless_rpc, count);
 422
 423                         /*
 424                          * We keep one window "ahead" of the other side, and
 425                          * will wait for an ACK only on the next one
 426                          */
 427                         if (!args->stateless_rpc && count == INITIAL_FLUSH)
 428                                 continue;
 429
 430                         consume_shallow_list(args, &reader);
 431                         do {
 432                                 ack = get_ack(&reader, result_oid);
 433                                 if (ack)
 434                                         print_verbose(args, _("got %s %d %s"), "ack",
 435                                                       ack, oid_to_hex(result_oid));
 436                                 switch (ack) {
 437                                 case ACK:
 438                                         flushes = 0;
 439                                         multi_ack = 0;
 440                                         retval = 0;
 441                                         goto done;
 442                                 case ACK_common:
 443                                 case ACK_ready:
 444                                 case ACK_continue: {
 445                                         struct commit *commit =
 446                                                 lookup_commit(the_repository,
 447                                                               result_oid);
 448                                         int was_common;
 449
 450                                         if (!commit)
 451                                                 die(_("invalid commit %s"), oid_to_hex(result_oid));
 452                                         was_common = negotiator->ack(negotiator, commit);
 453                                         if (args->stateless_rpc
 454                                          && ack == ACK_common
 455                                          && !was_common) {
 456                                                 /* We need to replay the have for this object
 457                                                  * on the next RPC request so the peer knows
 458                                                  * it is in common with us.
 459                                                  */
 460                                                 const char *hex = oid_to_hex(result_oid);
 461                                                 packet_buf_write(&req_buf, "have %s\n", hex);
 462                                                 state_len = req_buf.len;
 463                                                 /*
 464                                                  * Reset in_vain because an ack
 465                                                  * for this commit has not been
 466                                                  * seen.
 467                                                  */
 468                                                 in_vain = 0;
 469                                         } else if (!args->stateless_rpc
 470                                                    || ack != ACK_common)
 471                                                 in_vain = 0;
 472                                         retval = 0;
 473                                         got_continue = 1;
 474                                         if (ack == ACK_ready)
 475                                                 got_ready = 1;
 476                                         break;
 477                                         }
 478                                 }
 479                         } while (ack);
 480                         flushes--;
 481                         if (got_continue && MAX_IN_VAIN < in_vain) {
 482                                 print_verbose(args, _("giving up"));
 483                                 break; /* give up */
 484                         }
 485                         if (got_ready)
 486                                 break;
 487                 }
 488         }
 489 done:
 490         trace2_region_leave("fetch-pack", "negotiation_v0_v1", the_repository);
 491         if (!got_ready || !no_done) {
 492                 packet_buf_write(&req_buf, "done\n");
 493                 send_request(args, fd[1], &req_buf);
 494         }
 495         print_verbose(args, _("done"));
 496         if (retval != 0) {
 497                 multi_ack = 0;
 498                 flushes++;
 499         }
 500         strbuf_release(&req_buf);
 501
 502         if (!got_ready || !no_done)
 503                 consume_shallow_list(args, &reader);
 504         while (flushes || multi_ack) {
 505                 int ack = get_ack(&reader, result_oid);
 506                 if (ack) {
 507                         print_verbose(args, _("got %s (%d) %s"), "ack",
 508                                       ack, oid_to_hex(result_oid));
 509                         if (ack == ACK)
 510                                 return 0;
 511                         multi_ack = 1;
 512                         continue;
 513                 }
 514                 flushes--;
 515         }
 516         /* it is no error to fetch into a completely empty repo */
 517         return count ? retval : 0;
 518 }
 519
 520 static struct commit_list *complete;
 521
 522 static int mark_complete(const struct object_id *oid)
 523 {
 524         struct commit *commit = deref_without_lazy_fetch(oid, 1);
 525
 526         if (commit && !(commit->object.flags & COMPLETE)) {
 527                 commit->object.flags |= COMPLETE;
 528                 commit_list_insert(commit, &complete);
 529         }
 530         return 0;
 531 }
 532
 533 static int mark_complete_oid(const char *refname, const struct object_id *oid,
 534                              int flag, void *cb_data)
 535 {
 536         return mark_complete(oid);
 537 }
 538
 539 static void mark_recent_complete_commits(struct fetch_pack_args *args,
 540                                          timestamp_t cutoff)
 541 {
 542         while (complete && cutoff <= complete->item->date) {
 543                 print_verbose(args, _("Marking %s as complete"),
 544                               oid_to_hex(&complete->item->object.oid));
 545                 pop_most_recent_commit(&complete, COMPLETE);
 546         }
 547 }
 548
 549 static void add_refs_to_oidset(struct oidset *oids, struct ref *refs)
 550 {
 551         for (; refs; refs = refs->next)
 552                 oidset_insert(oids, &refs->old_oid);
 553 }
 554
 555 static int is_unmatched_ref(const struct ref *ref)
 556 {
 557         struct object_id oid;
 558         const char *p;
 559         return  ref->match_status == REF_NOT_MATCHED &&
 560                 !parse_oid_hex(ref->name, &oid, &p) &&
 561                 *p == '\0' &&
 562                 oideq(&oid, &ref->old_oid);
 563 }
 564
 565 static void filter_refs(struct fetch_pack_args *args,
 566                         struct ref **refs,
 567                         struct ref **sought, int nr_sought)
 568 {
 569         struct ref *newlist = NULL;
 570         struct ref **newtail = &newlist;
 571         struct ref *unmatched = NULL;
 572         struct ref *ref, *next;
 573         struct oidset tip_oids = OIDSET_INIT;
 574         int i;
 575         int strict = !(allow_unadvertised_object_request &
 576                        (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 577
 578         i = 0;
 579         for (ref = *refs; ref; ref = next) {
 580                 int keep = 0;
 581                 next = ref->next;
 582
 583                 if (starts_with(ref->name, "refs/") &&
 584                     check_refname_format(ref->name, 0)) {
 585                         /*
 586                          * trash or a peeled value; do not even add it to
 587                          * unmatched list
 588                          */
 589                         free_one_ref(ref);
 590                         continue;
 591                 } else {
 592                         while (i < nr_sought) {
 593                                 int cmp = strcmp(ref->name, sought[i]->name);
 594                                 if (cmp < 0)
 595                                         break; /* definitely do not have it */
 596                                 else if (cmp == 0) {
 597                                         keep = 1; /* definitely have it */
 598                                         sought[i]->match_status = REF_MATCHED;
 599                                 }
 600                                 i++;
 601                         }
 602
 603                         if (!keep && args->fetch_all &&
 604                             (!args->deepen || !starts_with(ref->name, "refs/tags/")))
 605                                 keep = 1;
 606                 }
 607
 608                 if (keep) {
 609                         *newtail = ref;
 610                         ref->next = NULL;
 611                         newtail = &ref->next;
 612                 } else {
 613                         ref->next = unmatched;
 614                         unmatched = ref;
 615                 }
 616         }
 617
 618         if (strict) {
 619                 for (i = 0; i < nr_sought; i++) {
 620                         ref = sought[i];
 621                         if (!is_unmatched_ref(ref))
 622                                 continue;
 623
 624                         add_refs_to_oidset(&tip_oids, unmatched);
 625                         add_refs_to_oidset(&tip_oids, newlist);
 626                         break;
 627                 }
 628         }
 629
 630         /* Append unmatched requests to the list */
 631         for (i = 0; i < nr_sought; i++) {
 632                 ref = sought[i];
 633                 if (!is_unmatched_ref(ref))
 634                         continue;
 635
 636                 if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) {
 637                         ref->match_status = REF_MATCHED;
 638                         *newtail = copy_ref(ref);
 639                         newtail = &(*newtail)->next;
 640                 } else {
 641                         ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
 642                 }
 643         }
 644
 645         oidset_clear(&tip_oids);
 646         free_refs(unmatched);
 647
 648         *refs = newlist;
 649 }
 650
 651 static void mark_alternate_complete(struct fetch_negotiator *unused,
 652                                     struct object *obj)
 653 {
 654         mark_complete(&obj->oid);
 655 }
 656
 657 struct loose_object_iter {
 658         struct oidset *loose_object_set;
 659         struct ref *refs;
 660 };
 661
 662 /*
 663  * Mark recent commits available locally and reachable from a local ref as
 664  * COMPLETE.
 665  *
 666  * The cutoff time for recency is determined by this heuristic: it is the
 667  * earliest commit time of the objects in refs that are commits and that we know
 668  * the commit time of.
 669  */
 670 static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
 671                                          struct fetch_pack_args *args,
 672                                          struct ref **refs)
 673 {
 674         struct ref *ref;
 675         int old_save_commit_buffer = save_commit_buffer;
 676         timestamp_t cutoff = 0;
 677
 678         save_commit_buffer = 0;
 679
 680         trace2_region_enter("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
 681         for (ref = *refs; ref; ref = ref->next) {
 682                 struct object *o;
 683
 684                 if (!has_object_file_with_flags(&ref->old_oid,
 685                                                 OBJECT_INFO_QUICK |
 686                                                         OBJECT_INFO_SKIP_FETCH_OBJECT))
 687                         continue;
 688                 o = parse_object(the_repository, &ref->old_oid);
 689                 if (!o)
 690                         continue;
 691
 692                 /*
 693                  * We already have it -- which may mean that we were
 694                  * in sync with the other side at some time after
 695                  * that (it is OK if we guess wrong here).
 696                  */
 697                 if (o->type == OBJ_COMMIT) {
 698                         struct commit *commit = (struct commit *)o;
 699                         if (!cutoff || cutoff < commit->date)
 700                                 cutoff = commit->date;
 701                 }
 702         }
 703         trace2_region_leave("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
 704
 705         /*
 706          * This block marks all local refs as COMPLETE, and then recursively marks all
 707          * parents of those refs as COMPLETE.
 708          */
 709         trace2_region_enter("fetch-pack", "mark_complete_local_refs", NULL);
 710         if (!args->deepen) {
 711                 for_each_rawref(mark_complete_oid, NULL);
 712                 for_each_cached_alternate(NULL, mark_alternate_complete);
 713                 commit_list_sort_by_date(&complete);
 714                 if (cutoff)
 715                         mark_recent_complete_commits(args, cutoff);
 716         }
 717         trace2_region_leave("fetch-pack", "mark_complete_local_refs", NULL);
 718
 719         /*
 720          * Mark all complete remote refs as common refs.
 721          * Don't mark them common yet; the server has to be told so first.
 722          */
 723         trace2_region_enter("fetch-pack", "mark_common_remote_refs", NULL);
 724         for (ref = *refs; ref; ref = ref->next) {
 725                 struct commit *c = deref_without_lazy_fetch(&ref->old_oid, 0);
 726
 727                 if (!c || !(c->object.flags & COMPLETE))
 728                         continue;
 729
 730                 negotiator->known_common(negotiator, c);
 731         }
 732         trace2_region_leave("fetch-pack", "mark_common_remote_refs", NULL);
 733
 734         save_commit_buffer = old_save_commit_buffer;
 735 }
 736
 737 /*
 738  * Returns 1 if every object pointed to by the given remote refs is available
 739  * locally and reachable from a local ref, and 0 otherwise.
 740  */
 741 static int everything_local(struct fetch_pack_args *args,
 742                             struct ref **refs)
 743 {
 744         struct ref *ref;
 745         int retval;
 746
 747         for (retval = 1, ref = *refs; ref ; ref = ref->next) {
 748                 const struct object_id *remote = &ref->old_oid;
 749                 struct object *o;
 750
 751                 o = lookup_object(the_repository, remote);
 752                 if (!o || !(o->flags & COMPLETE)) {
 753                         retval = 0;
 754                         print_verbose(args, "want %s (%s)", oid_to_hex(remote),
 755                                       ref->name);
 756                         continue;
 757                 }
 758                 print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote),
 759                               ref->name);
 760         }
 761
 762         return retval;
 763 }
 764
 765 static int sideband_demux(int in, int out, void *data)
 766 {
 767         int *xd = data;
 768         int ret;
 769
 770         ret = recv_sideband("fetch-pack", xd[0], out);
 771         close(out);
 772         return ret;
 773 }
 774
 775 static void create_promisor_file(const char *keep_name,
 776                                  struct ref **sought, int nr_sought)
 777 {
 778         struct strbuf promisor_name = STRBUF_INIT;
 779         int suffix_stripped;
 780
 781         strbuf_addstr(&promisor_name, keep_name);
 782         suffix_stripped = strbuf_strip_suffix(&promisor_name, ".keep");
 783         if (!suffix_stripped)
 784                 BUG("name of pack lockfile should end with .keep (was '%s')",
 785                     keep_name);
 786         strbuf_addstr(&promisor_name, ".promisor");
 787
 788         write_promisor_file(promisor_name.buf, sought, nr_sought);
 789
 790         strbuf_release(&promisor_name);
 791 }
 792
 793 /*
 794  * Pass 1 as "only_packfile" if the pack received is the only pack in this
 795  * fetch request (that is, if there were no packfile URIs provided).
 796  */
 797 static int get_pack(struct fetch_pack_args *args,
 798                     int xd[2], struct string_list *pack_lockfiles,
 799                     int only_packfile,
 800                     struct ref **sought, int nr_sought)
 801 {
 802         struct async demux;
 803         int do_keep = args->keep_pack;
 804         const char *cmd_name;
 805         struct pack_header header;
 806         int pass_header = 0;
 807         struct child_process cmd = CHILD_PROCESS_INIT;
 808         int ret;
 809
 810         memset(&demux, 0, sizeof(demux));
 811         if (use_sideband) {
 812                 /* xd[] is talking with upload-pack; subprocess reads from
 813                  * xd[0], spits out band#2 to stderr, and feeds us band#1
 814                  * through demux->out.
 815                  */
 816                 demux.proc = sideband_demux;
 817                 demux.data = xd;
 818                 demux.out = -1;
 819                 demux.isolate_sigpipe = 1;
 820                 if (start_async(&demux))
 821                         die(_("fetch-pack: unable to fork off sideband demultiplexer"));
 822         }
 823         else
 824                 demux.out = xd[0];
 825
 826         if (!args->keep_pack && unpack_limit) {
 827
 828                 if (read_pack_header(demux.out, &header))
 829                         die(_("protocol error: bad pack header"));
 830                 pass_header = 1;
 831                 if (ntohl(header.hdr_entries) < unpack_limit)
 832                         do_keep = 0;
 833                 else
 834                         do_keep = 1;
 835         }
 836
 837         if (alternate_shallow_file) {
 838                 strvec_push(&cmd.args, "--shallow-file");
 839                 strvec_push(&cmd.args, alternate_shallow_file);
 840         }
 841
 842         if (do_keep || args->from_promisor) {
 843                 if (pack_lockfiles)
 844                         cmd.out = -1;
 845                 cmd_name = "index-pack";
 846                 strvec_push(&cmd.args, cmd_name);
 847                 strvec_push(&cmd.args, "--stdin");
 848                 if (!args->quiet && !args->no_progress)
 849                         strvec_push(&cmd.args, "-v");
 850                 if (args->use_thin_pack)
 851                         strvec_push(&cmd.args, "--fix-thin");
 852                 if (do_keep && (args->lock_pack || unpack_limit)) {
 853                         char hostname[HOST_NAME_MAX + 1];
 854                         if (xgethostname(hostname, sizeof(hostname)))
 855                                 xsnprintf(hostname, sizeof(hostname), "localhost");
 856                         strvec_pushf(&cmd.args,
 857                                      "--keep=fetch-pack %"PRIuMAX " on %s",
 858                                      (uintmax_t)getpid(), hostname);
 859                 }
 860                 if (only_packfile && args->check_self_contained_and_connected)
 861                         strvec_push(&cmd.args, "--check-self-contained-and-connected");
 862                 else
 863                         /*
 864                          * We cannot perform any connectivity checks because
 865                          * not all packs have been downloaded; let the caller
 866                          * have this responsibility.
 867                          */
 868                         args->check_self_contained_and_connected = 0;
 869
 870                 if (args->from_promisor)
 871                         /*
 872                          * create_promisor_file() may be called afterwards but
 873                          * we still need index-pack to know that this is a
 874                          * promisor pack. For example, if transfer.fsckobjects
 875                          * is true, index-pack needs to know that .gitmodules
 876                          * is a promisor object (so that it won't complain if
 877                          * it is missing).
 878                          */
 879                         strvec_push(&cmd.args, "--promisor");
 880         }
 881         else {
 882                 cmd_name = "unpack-objects";
 883                 strvec_push(&cmd.args, cmd_name);
 884                 if (args->quiet || args->no_progress)
 885                         strvec_push(&cmd.args, "-q");
 886                 args->check_self_contained_and_connected = 0;
 887         }
 888
 889         if (pass_header)
 890                 strvec_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32,
 891                              ntohl(header.hdr_version),
 892                                  ntohl(header.hdr_entries));
 893         if (fetch_fsck_objects >= 0
 894             ? fetch_fsck_objects
 895             : transfer_fsck_objects >= 0
 896             ? transfer_fsck_objects
 897             : 0) {
 898                 if (args->from_promisor || !only_packfile)
 899                         /*
 900                          * We cannot use --strict in index-pack because it
 901                          * checks both broken objects and links, but we only
 902                          * want to check for broken objects.
 903                          */
 904                         strvec_push(&cmd.args, "--fsck-objects");
 905                 else
 906                         strvec_pushf(&cmd.args, "--strict%s",
 907                                      fsck_msg_types.buf);
 908         }
 909
 910         cmd.in = demux.out;
 911         cmd.git_cmd = 1;
 912         if (start_command(&cmd))
 913                 die(_("fetch-pack: unable to fork off %s"), cmd_name);
 914         if (do_keep && pack_lockfiles) {
 915                 char *pack_lockfile = index_pack_lockfile(cmd.out);
 916                 if (pack_lockfile)
 917                         string_list_append_nodup(pack_lockfiles, pack_lockfile);
 918                 close(cmd.out);
 919         }
 920
 921         if (!use_sideband)
 922                 /* Closed by start_command() */
 923                 xd[0] = -1;
 924
 925         ret = finish_command(&cmd);
 926         if (!ret || (args->check_self_contained_and_connected && ret == 1))
 927                 args->self_contained_and_connected =
 928                         args->check_self_contained_and_connected &&
 929                         ret == 0;
 930         else
 931                 die(_("%s failed"), cmd_name);
 932         if (use_sideband && finish_async(&demux))
 933                 die(_("error in sideband demultiplexer"));
 934
 935         /*
 936          * Now that index-pack has succeeded, write the promisor file using the
 937          * obtained .keep filename if necessary
 938          */
 939         if (do_keep && pack_lockfiles && pack_lockfiles->nr && args->from_promisor)
 940                 create_promisor_file(pack_lockfiles->items[0].string, sought, nr_sought);
 941
 942         return 0;
 943 }
 944
 945 static int cmp_ref_by_name(const void *a_, const void *b_)
 946 {
 947         const struct ref *a = *((const struct ref **)a_);
 948         const struct ref *b = *((const struct ref **)b_);
 949         return strcmp(a->name, b->name);
 950 }
 951
 952 static struct ref *do_fetch_pack(struct fetch_pack_args *args,
 953                                  int fd[2],
 954                                  const struct ref *orig_ref,
 955                                  struct ref **sought, int nr_sought,
 956                                  struct shallow_info *si,
 957                                  struct string_list *pack_lockfiles)
 958 {
 959         struct repository *r = the_repository;
 960         struct ref *ref = copy_ref_list(orig_ref);
 961         struct object_id oid;
 962         const char *agent_feature;
 963         int agent_len;
 964         struct fetch_negotiator negotiator_alloc;
 965         struct fetch_negotiator *negotiator;
 966
 967         negotiator = &negotiator_alloc;
 968         fetch_negotiator_init(r, negotiator);
 969
 970         sort_ref_list(&ref, ref_compare_name);
 971         QSORT(sought, nr_sought, cmp_ref_by_name);
 972
 973         if ((agent_feature = server_feature_value("agent", &agent_len))) {
 974                 agent_supported = 1;
 975                 if (agent_len)
 976                         print_verbose(args, _("Server version is %.*s"),
 977                                       agent_len, agent_feature);
 978         }
 979
 980         if (!server_supports("session-id"))
 981                 advertise_sid = 0;
 982
 983         if (server_supports("shallow"))
 984                 print_verbose(args, _("Server supports %s"), "shallow");
 985         else if (args->depth > 0 || is_repository_shallow(r))
 986                 die(_("Server does not support shallow clients"));
 987         if (args->depth > 0 || args->deepen_since || args->deepen_not)
 988                 args->deepen = 1;
 989         if (server_supports("multi_ack_detailed")) {
 990                 print_verbose(args, _("Server supports %s"), "multi_ack_detailed");
 991                 multi_ack = 2;
 992                 if (server_supports("no-done")) {
 993                         print_verbose(args, _("Server supports %s"), "no-done");
 994                         if (args->stateless_rpc)
 995                                 no_done = 1;
 996                 }
 997         }
 998         else if (server_supports("multi_ack")) {
 999                 print_verbose(args, _("Server supports %s"), "multi_ack");
1000                 multi_ack = 1;
1001         }
1002         if (server_supports("side-band-64k")) {
1003                 print_verbose(args, _("Server supports %s"), "side-band-64k");
1004                 use_sideband = 2;
1005         }
1006         else if (server_supports("side-band")) {
1007                 print_verbose(args, _("Server supports %s"), "side-band");
1008                 use_sideband = 1;
1009         }
1010         if (server_supports("allow-tip-sha1-in-want")) {
1011                 print_verbose(args, _("Server supports %s"), "allow-tip-sha1-in-want");
1012                 allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1013         }
1014         if (server_supports("allow-reachable-sha1-in-want")) {
1015                 print_verbose(args, _("Server supports %s"), "allow-reachable-sha1-in-want");
1016                 allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1017         }
1018         if (server_supports("thin-pack"))
1019                 print_verbose(args, _("Server supports %s"), "thin-pack");
1020         else
1021                 args->use_thin_pack = 0;
1022         if (server_supports("no-progress"))
1023                 print_verbose(args, _("Server supports %s"), "no-progress");
1024         else
1025                 args->no_progress = 0;
1026         if (server_supports("include-tag"))
1027                 print_verbose(args, _("Server supports %s"), "include-tag");
1028         else
1029                 args->include_tag = 0;
1030         if (server_supports("ofs-delta"))
1031                 print_verbose(args, _("Server supports %s"), "ofs-delta");
1032         else
1033                 prefer_ofs_delta = 0;
1034
1035         if (server_supports("filter")) {
1036                 server_supports_filtering = 1;
1037                 print_verbose(args, _("Server supports %s"), "filter");
1038         } else if (args->filter_options.choice) {
1039                 warning("filtering not recognized by server, ignoring");
1040         }
1041
1042         if (server_supports("deepen-since")) {
1043                 print_verbose(args, _("Server supports %s"), "deepen-since");
1044                 deepen_since_ok = 1;
1045         } else if (args->deepen_since)
1046                 die(_("Server does not support --shallow-since"));
1047         if (server_supports("deepen-not")) {
1048                 print_verbose(args, _("Server supports %s"), "deepen-not");
1049                 deepen_not_ok = 1;
1050         } else if (args->deepen_not)
1051                 die(_("Server does not support --shallow-exclude"));
1052         if (server_supports("deepen-relative"))
1053                 print_verbose(args, _("Server supports %s"), "deepen-relative");
1054         else if (args->deepen_relative)
1055                 die(_("Server does not support --deepen"));
1056         if (!server_supports_hash(the_hash_algo->name, NULL))
1057                 die(_("Server does not support this repository's object format"));
1058
1059         mark_complete_and_common_ref(negotiator, args, &ref);
1060         filter_refs(args, &ref, sought, nr_sought);
1061         if (everything_local(args, &ref)) {
1062                 packet_flush(fd[1]);
1063                 goto all_done;
1064         }
1065         if (find_common(negotiator, args, fd, &oid, ref) < 0)
1066                 if (!args->keep_pack)
1067                         /* When cloning, it is not unusual to have
1068                          * no common commit.
1069                          */
1070                         warning(_("no common commits"));
1071
1072         if (args->stateless_rpc)
1073                 packet_flush(fd[1]);
1074         if (args->deepen)
1075                 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1076                                         NULL);
1077         else if (si->nr_ours || si->nr_theirs)
1078                 alternate_shallow_file = setup_temporary_shallow(si->shallow);
1079         else
1080                 alternate_shallow_file = NULL;
1081         if (get_pack(args, fd, pack_lockfiles, 1, sought, nr_sought))
1082                 die(_("git fetch-pack: fetch failed."));
1083
1084  all_done:
1085         if (negotiator)
1086                 negotiator->release(negotiator);
1087         return ref;
1088 }
1089
1090 static void add_shallow_requests(struct strbuf *req_buf,
1091                                  const struct fetch_pack_args *args)
1092 {
1093         if (is_repository_shallow(the_repository))
1094                 write_shallow_commits(req_buf, 1, NULL);
1095         if (args->depth > 0)
1096                 packet_buf_write(req_buf, "deepen %d", args->depth);
1097         if (args->deepen_since) {
1098                 timestamp_t max_age = approxidate(args->deepen_since);
1099                 packet_buf_write(req_buf, "deepen-since %"PRItime, max_age);
1100         }
1101         if (args->deepen_not) {
1102                 int i;
1103                 for (i = 0; i < args->deepen_not->nr; i++) {
1104                         struct string_list_item *s = args->deepen_not->items + i;
1105                         packet_buf_write(req_buf, "deepen-not %s", s->string);
1106                 }
1107         }
1108         if (args->deepen_relative)
1109                 packet_buf_write(req_buf, "deepen-relative\n");
1110 }
1111
1112 static void add_wants(const struct ref *wants, struct strbuf *req_buf)
1113 {
1114         int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
1115
1116         for ( ; wants ; wants = wants->next) {
1117                 const struct object_id *remote = &wants->old_oid;
1118                 struct object *o;
1119
1120                 /*
1121                  * If that object is complete (i.e. it is an ancestor of a
1122                  * local ref), we tell them we have it but do not have to
1123                  * tell them about its ancestors, which they already know
1124                  * about.
1125                  *
1126                  * We use lookup_object here because we are only
1127                  * interested in the case we *know* the object is
1128                  * reachable and we have already scanned it.
1129                  */
1130                 if (((o = lookup_object(the_repository, remote)) != NULL) &&
1131                     (o->flags & COMPLETE)) {
1132                         continue;
1133                 }
1134
1135                 if (!use_ref_in_want || wants->exact_oid)
1136                         packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
1137                 else
1138                         packet_buf_write(req_buf, "want-ref %s\n", wants->name);
1139         }
1140 }
1141
1142 static void add_common(struct strbuf *req_buf, struct oidset *common)
1143 {
1144         struct oidset_iter iter;
1145         const struct object_id *oid;
1146         oidset_iter_init(common, &iter);
1147
1148         while ((oid = oidset_iter_next(&iter))) {
1149                 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1150         }
1151 }
1152
1153 static int add_haves(struct fetch_negotiator *negotiator,
1154                      int seen_ack,
1155                      struct strbuf *req_buf,
1156                      int *haves_to_send, int *in_vain)
1157 {
1158         int ret = 0;
1159         int haves_added = 0;
1160         const struct object_id *oid;
1161
1162         while ((oid = negotiator->next(negotiator))) {
1163                 packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid));
1164                 if (++haves_added >= *haves_to_send)
1165                         break;
1166         }
1167
1168         *in_vain += haves_added;
1169         if (!haves_added || (seen_ack && *in_vain >= MAX_IN_VAIN)) {
1170                 /* Send Done */
1171                 packet_buf_write(req_buf, "done\n");
1172                 ret = 1;
1173         }
1174
1175         /* Increase haves to send on next round */
1176         *haves_to_send = next_flush(1, *haves_to_send);
1177
1178         return ret;
1179 }
1180
1181 static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
1182                               struct fetch_pack_args *args,
1183                               const struct ref *wants, struct oidset *common,
1184                               int *haves_to_send, int *in_vain,
1185                               int sideband_all, int seen_ack)
1186 {
1187         int ret = 0;
1188         const char *hash_name;
1189         struct strbuf req_buf = STRBUF_INIT;
1190
1191         if (server_supports_v2("fetch", 1))
1192                 packet_buf_write(&req_buf, "command=fetch");
1193         if (server_supports_v2("agent", 0))
1194                 packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
1195         if (advertise_sid && server_supports_v2("session-id", 0))
1196                 packet_buf_write(&req_buf, "session-id=%s", trace2_session_id());
1197         if (args->server_options && args->server_options->nr &&
1198             server_supports_v2("server-option", 1)) {
1199                 int i;
1200                 for (i = 0; i < args->server_options->nr; i++)
1201                         packet_buf_write(&req_buf, "server-option=%s",
1202                                          args->server_options->items[i].string);
1203         }
1204
1205         if (server_feature_v2("object-format", &hash_name)) {
1206                 int hash_algo = hash_algo_by_name(hash_name);
1207                 if (hash_algo_by_ptr(the_hash_algo) != hash_algo)
1208                         die(_("mismatched algorithms: client %s; server %s"),
1209                             the_hash_algo->name, hash_name);
1210                 packet_write_fmt(fd_out, "object-format=%s", the_hash_algo->name);
1211         } else if (hash_algo_by_ptr(the_hash_algo) != GIT_HASH_SHA1) {
1212                 die(_("the server does not support algorithm '%s'"),
1213                     the_hash_algo->name);
1214         }
1215
1216         packet_buf_delim(&req_buf);
1217         if (args->use_thin_pack)
1218                 packet_buf_write(&req_buf, "thin-pack");
1219         if (args->no_progress)
1220                 packet_buf_write(&req_buf, "no-progress");
1221         if (args->include_tag)
1222                 packet_buf_write(&req_buf, "include-tag");
1223         if (prefer_ofs_delta)
1224                 packet_buf_write(&req_buf, "ofs-delta");
1225         if (sideband_all)
1226                 packet_buf_write(&req_buf, "sideband-all");
1227
1228         /* Add shallow-info and deepen request */
1229         if (server_supports_feature("fetch", "shallow", 0))
1230                 add_shallow_requests(&req_buf, args);
1231         else if (is_repository_shallow(the_repository) || args->deepen)
1232                 die(_("Server does not support shallow requests"));
1233
1234         /* Add filter */
1235         if (server_supports_feature("fetch", "filter", 0) &&
1236             args->filter_options.choice) {
1237                 const char *spec =
1238                         expand_list_objects_filter_spec(&args->filter_options);
1239                 print_verbose(args, _("Server supports filter"));
1240                 packet_buf_write(&req_buf, "filter %s", spec);
1241         } else if (args->filter_options.choice) {
1242                 warning("filtering not recognized by server, ignoring");
1243         }
1244
1245         if (server_supports_feature("fetch", "packfile-uris", 0)) {
1246                 int i;
1247                 struct strbuf to_send = STRBUF_INIT;
1248
1249                 for (i = 0; i < uri_protocols.nr; i++) {
1250                         const char *s = uri_protocols.items[i].string;
1251
1252                         if (!strcmp(s, "https") || !strcmp(s, "http")) {
1253                                 if (to_send.len)
1254                                         strbuf_addch(&to_send, ',');
1255                                 strbuf_addstr(&to_send, s);
1256                         }
1257                 }
1258                 if (to_send.len) {
1259                         packet_buf_write(&req_buf, "packfile-uris %s",
1260                                          to_send.buf);
1261                         strbuf_release(&to_send);
1262                 }
1263         }
1264
1265         /* add wants */
1266         add_wants(wants, &req_buf);
1267
1268         /* Add all of the common commits we've found in previous rounds */
1269         add_common(&req_buf, common);
1270
1271         /* Add initial haves */
1272         ret = add_haves(negotiator, seen_ack, &req_buf,
1273                         haves_to_send, in_vain);
1274
1275         /* Send request */
1276         packet_buf_flush(&req_buf);
1277         if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
1278                 die_errno(_("unable to write request to remote"));
1279
1280         strbuf_release(&req_buf);
1281         return ret;
1282 }
1283
1284 /*
1285  * Processes a section header in a server's response and checks if it matches
1286  * `section`.  If the value of `peek` is 1, the header line will be peeked (and
1287  * not consumed); if 0, the line will be consumed and the function will die if
1288  * the section header doesn't match what was expected.
1289  */
1290 static int process_section_header(struct packet_reader *reader,
1291                                   const char *section, int peek)
1292 {
1293         int ret;
1294
1295         if (packet_reader_peek(reader) != PACKET_READ_NORMAL)
1296                 die(_("error reading section header '%s'"), section);
1297
1298         ret = !strcmp(reader->line, section);
1299
1300         if (!peek) {
1301                 if (!ret)
1302                         die(_("expected '%s', received '%s'"),
1303                             section, reader->line);
1304                 packet_reader_read(reader);
1305         }
1306
1307         return ret;
1308 }
1309
1310 enum common_found {
1311         /*
1312          * No commit was found to be possessed by both the client and the
1313          * server, and "ready" was not received.
1314          */
1315         NO_COMMON_FOUND,
1316
1317         /*
1318          * At least one commit was found to be possessed by both the client and
1319          * the server, and "ready" was not received.
1320          */
1321         COMMON_FOUND,
1322
1323         /*
1324          * "ready" was received, indicating that the server is ready to send
1325          * the packfile without any further negotiation.
1326          */
1327         READY
1328 };
1329
1330 static enum common_found process_acks(struct fetch_negotiator *negotiator,
1331                                       struct packet_reader *reader,
1332                                       struct oidset *common)
1333 {
1334         /* received */
1335         int received_ready = 0;
1336         int received_ack = 0;
1337
1338         process_section_header(reader, "acknowledgments", 0);
1339         while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1340                 const char *arg;
1341
1342                 if (!strcmp(reader->line, "NAK"))
1343                         continue;
1344
1345                 if (skip_prefix(reader->line, "ACK ", &arg)) {
1346                         struct object_id oid;
1347                         received_ack = 1;
1348                         if (!get_oid_hex(arg, &oid)) {
1349                                 struct commit *commit;
1350                                 oidset_insert(common, &oid);
1351                                 commit = lookup_commit(the_repository, &oid);
1352                                 if (negotiator)
1353                                         negotiator->ack(negotiator, commit);
1354                         }
1355                         continue;
1356                 }
1357
1358                 if (!strcmp(reader->line, "ready")) {
1359                         received_ready = 1;
1360                         continue;
1361                 }
1362
1363                 die(_("unexpected acknowledgment line: '%s'"), reader->line);
1364         }
1365
1366         if (reader->status != PACKET_READ_FLUSH &&
1367             reader->status != PACKET_READ_DELIM)
1368                 die(_("error processing acks: %d"), reader->status);
1369
1370         /*
1371          * If an "acknowledgments" section is sent, a packfile is sent if and
1372          * only if "ready" was sent in this section. The other sections
1373          * ("shallow-info" and "wanted-refs") are sent only if a packfile is
1374          * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH
1375          * otherwise.
1376          */
1377         if (received_ready && reader->status != PACKET_READ_DELIM)
1378                 die(_("expected packfile to be sent after 'ready'"));
1379         if (!received_ready && reader->status != PACKET_READ_FLUSH)
1380                 die(_("expected no other sections to be sent after no 'ready'"));
1381
1382         return received_ready ? READY :
1383                 (received_ack ? COMMON_FOUND : NO_COMMON_FOUND);
1384 }
1385
1386 static void receive_shallow_info(struct fetch_pack_args *args,
1387                                  struct packet_reader *reader,
1388                                  struct oid_array *shallows,
1389                                  struct shallow_info *si)
1390 {
1391         int unshallow_received = 0;
1392
1393         process_section_header(reader, "shallow-info", 0);
1394         while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1395                 const char *arg;
1396                 struct object_id oid;
1397
1398                 if (skip_prefix(reader->line, "shallow ", &arg)) {
1399                         if (get_oid_hex(arg, &oid))
1400                                 die(_("invalid shallow line: %s"), reader->line);
1401                         oid_array_append(shallows, &oid);
1402                         continue;
1403                 }
1404                 if (skip_prefix(reader->line, "unshallow ", &arg)) {
1405                         if (get_oid_hex(arg, &oid))
1406                                 die(_("invalid unshallow line: %s"), reader->line);
1407                         if (!lookup_object(the_repository, &oid))
1408                                 die(_("object not found: %s"), reader->line);
1409                         /* make sure that it is parsed as shallow */
1410                         if (!parse_object(the_repository, &oid))
1411                                 die(_("error in object: %s"), reader->line);
1412                         if (unregister_shallow(&oid))
1413                                 die(_("no shallow found: %s"), reader->line);
1414                         unshallow_received = 1;
1415                         continue;
1416                 }
1417                 die(_("expected shallow/unshallow, got %s"), reader->line);
1418         }
1419
1420         if (reader->status != PACKET_READ_FLUSH &&
1421             reader->status != PACKET_READ_DELIM)
1422                 die(_("error processing shallow info: %d"), reader->status);
1423
1424         if (args->deepen || unshallow_received) {
1425                 /*
1426                  * Treat these as shallow lines caused by our depth settings.
1427                  * In v0, these lines cannot cause refs to be rejected; do the
1428                  * same.
1429                  */
1430                 int i;
1431
1432                 for (i = 0; i < shallows->nr; i++)
1433                         register_shallow(the_repository, &shallows->oid[i]);
1434                 setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
1435                                         NULL);
1436                 args->deepen = 1;
1437         } else if (shallows->nr) {
1438                 /*
1439                  * Treat these as shallow lines caused by the remote being
1440                  * shallow. In v0, remote refs that reach these objects are
1441                  * rejected (unless --update-shallow is set); do the same.
1442                  */
1443                 prepare_shallow_info(si, shallows);
1444                 if (si->nr_ours || si->nr_theirs)
1445                         alternate_shallow_file =
1446                                 setup_temporary_shallow(si->shallow);
1447                 else
1448                         alternate_shallow_file = NULL;
1449         } else {
1450                 alternate_shallow_file = NULL;
1451         }
1452 }
1453
1454 static int cmp_name_ref(const void *name, const void *ref)
1455 {
1456         return strcmp(name, (*(struct ref **)ref)->name);
1457 }
1458
1459 static void receive_wanted_refs(struct packet_reader *reader,
1460                                 struct ref **sought, int nr_sought)
1461 {
1462         process_section_header(reader, "wanted-refs", 0);
1463         while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1464                 struct object_id oid;
1465                 const char *end;
1466                 struct ref **found;
1467
1468                 if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ')
1469                         die(_("expected wanted-ref, got '%s'"), reader->line);
1470
1471                 found = bsearch(end, sought, nr_sought, sizeof(*sought),
1472                                 cmp_name_ref);
1473                 if (!found)
1474                         die(_("unexpected wanted-ref: '%s'"), reader->line);
1475                 oidcpy(&(*found)->old_oid, &oid);
1476         }
1477
1478         if (reader->status != PACKET_READ_DELIM)
1479                 die(_("error processing wanted refs: %d"), reader->status);
1480 }
1481
1482 static void receive_packfile_uris(struct packet_reader *reader,
1483                                   struct string_list *uris)
1484 {
1485         process_section_header(reader, "packfile-uris", 0);
1486         while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
1487                 if (reader->pktlen < the_hash_algo->hexsz ||
1488                     reader->line[the_hash_algo->hexsz] != ' ')
1489                         die("expected '<hash> <uri>', got: %s\n", reader->line);
1490
1491                 string_list_append(uris, reader->line);
1492         }
1493         if (reader->status != PACKET_READ_DELIM)
1494                 die("expected DELIM");
1495 }
1496
1497 enum fetch_state {
1498         FETCH_CHECK_LOCAL = 0,
1499         FETCH_SEND_REQUEST,
1500         FETCH_PROCESS_ACKS,
1501         FETCH_GET_PACK,
1502         FETCH_DONE,
1503 };
1504
1505 static void do_check_stateless_delimiter(const struct fetch_pack_args *args,
1506                                          struct packet_reader *reader)
1507 {
1508         check_stateless_delimiter(args->stateless_rpc, reader,
1509                                   _("git fetch-pack: expected response end packet"));
1510 }
1511
1512 static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
1513                                     int fd[2],
1514                                     const struct ref *orig_ref,
1515                                     struct ref **sought, int nr_sought,
1516                                     struct oid_array *shallows,
1517                                     struct shallow_info *si,
1518                                     struct string_list *pack_lockfiles)
1519 {
1520         struct repository *r = the_repository;
1521         struct ref *ref = copy_ref_list(orig_ref);
1522         enum fetch_state state = FETCH_CHECK_LOCAL;
1523         struct oidset common = OIDSET_INIT;
1524         struct packet_reader reader;
1525         int in_vain = 0, negotiation_started = 0;
1526         int haves_to_send = INITIAL_FLUSH;
1527         struct fetch_negotiator negotiator_alloc;
1528         struct fetch_negotiator *negotiator;
1529         int seen_ack = 0;
1530         struct string_list packfile_uris = STRING_LIST_INIT_DUP;
1531         int i;
1532
1533         negotiator = &negotiator_alloc;
1534         fetch_negotiator_init(r, negotiator);
1535
1536         packet_reader_init(&reader, fd[0], NULL, 0,
1537                            PACKET_READ_CHOMP_NEWLINE |
1538                            PACKET_READ_DIE_ON_ERR_PACKET);
1539         if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) &&
1540             server_supports_feature("fetch", "sideband-all", 0)) {
1541                 reader.use_sideband = 1;
1542                 reader.me = "fetch-pack";
1543         }
1544
1545         while (state != FETCH_DONE) {
1546                 switch (state) {
1547                 case FETCH_CHECK_LOCAL:
1548                         sort_ref_list(&ref, ref_compare_name);
1549                         QSORT(sought, nr_sought, cmp_ref_by_name);
1550
1551                         /* v2 supports these by default */
1552                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1553                         use_sideband = 2;
1554                         if (args->depth > 0 || args->deepen_since || args->deepen_not)
1555                                 args->deepen = 1;
1556
1557                         /* Filter 'ref' by 'sought' and those that aren't local */
1558                         mark_complete_and_common_ref(negotiator, args, &ref);
1559                         filter_refs(args, &ref, sought, nr_sought);
1560                         if (everything_local(args, &ref))
1561                                 state = FETCH_DONE;
1562                         else
1563                                 state = FETCH_SEND_REQUEST;
1564
1565                         mark_tips(negotiator, args->negotiation_tips);
1566                         for_each_cached_alternate(negotiator,
1567                                                   insert_one_alternate_object);
1568                         break;
1569                 case FETCH_SEND_REQUEST:
1570                         if (!negotiation_started) {
1571                                 negotiation_started = 1;
1572                                 trace2_region_enter("fetch-pack",
1573                                                     "negotiation_v2",
1574                                                     the_repository);
1575                         }
1576                         if (send_fetch_request(negotiator, fd[1], args, ref,
1577                                                &common,
1578                                                &haves_to_send, &in_vain,
1579                                                reader.use_sideband,
1580                                                seen_ack))
1581                                 state = FETCH_GET_PACK;
1582                         else
1583                                 state = FETCH_PROCESS_ACKS;
1584                         break;
1585                 case FETCH_PROCESS_ACKS:
1586                         /* Process ACKs/NAKs */
1587                         switch (process_acks(negotiator, &reader, &common)) {
1588                         case READY:
1589                                 /*
1590                                  * Don't check for response delimiter; get_pack() will
1591                                  * read the rest of this response.
1592                                  */
1593                                 state = FETCH_GET_PACK;
1594                                 break;
1595                         case COMMON_FOUND:
1596                                 in_vain = 0;
1597                                 seen_ack = 1;
1598                                 /* fallthrough */
1599                         case NO_COMMON_FOUND:
1600                                 do_check_stateless_delimiter(args, &reader);
1601                                 state = FETCH_SEND_REQUEST;
1602                                 break;
1603                         }
1604                         break;
1605                 case FETCH_GET_PACK:
1606                         trace2_region_leave("fetch-pack",
1607                                             "negotiation_v2",
1608                                             the_repository);
1609                         /* Check for shallow-info section */
1610                         if (process_section_header(&reader, "shallow-info", 1))
1611                                 receive_shallow_info(args, &reader, shallows, si);
1612
1613                         if (process_section_header(&reader, "wanted-refs", 1))
1614                                 receive_wanted_refs(&reader, sought, nr_sought);
1615
1616                         /* get the pack(s) */
1617                         if (process_section_header(&reader, "packfile-uris", 1))
1618                                 receive_packfile_uris(&reader, &packfile_uris);
1619                         process_section_header(&reader, "packfile", 0);
1620                         if (get_pack(args, fd, pack_lockfiles,
1621                                      !packfile_uris.nr, sought, nr_sought))
1622                                 die(_("git fetch-pack: fetch failed."));
1623                         do_check_stateless_delimiter(args, &reader);
1624
1625                         state = FETCH_DONE;
1626                         break;
1627                 case FETCH_DONE:
1628                         continue;
1629                 }
1630         }
1631
1632         for (i = 0; i < packfile_uris.nr; i++) {
1633                 struct child_process cmd = CHILD_PROCESS_INIT;
1634                 char packname[GIT_MAX_HEXSZ + 1];
1635                 const char *uri = packfile_uris.items[i].string +
1636                         the_hash_algo->hexsz + 1;
1637
1638                 strvec_push(&cmd.args, "http-fetch");
1639                 strvec_pushf(&cmd.args, "--packfile=%.*s",
1640                              (int) the_hash_algo->hexsz,
1641                              packfile_uris.items[i].string);
1642                 strvec_push(&cmd.args, uri);
1643                 cmd.git_cmd = 1;
1644                 cmd.no_stdin = 1;
1645                 cmd.out = -1;
1646                 if (start_command(&cmd))
1647                         die("fetch-pack: unable to spawn http-fetch");
1648
1649                 if (read_in_full(cmd.out, packname, 5) < 0 ||
1650                     memcmp(packname, "keep\t", 5))
1651                         die("fetch-pack: expected keep then TAB at start of http-fetch output");
1652
1653                 if (read_in_full(cmd.out, packname,
1654                                  the_hash_algo->hexsz + 1) < 0 ||
1655                     packname[the_hash_algo->hexsz] != '\n')
1656                         die("fetch-pack: expected hash then LF at end of http-fetch output");
1657
1658                 packname[the_hash_algo->hexsz] = '\0';
1659
1660                 close(cmd.out);
1661
1662                 if (finish_command(&cmd))
1663                         die("fetch-pack: unable to finish http-fetch");
1664
1665                 if (memcmp(packfile_uris.items[i].string, packname,
1666                            the_hash_algo->hexsz))
1667                         die("fetch-pack: pack downloaded from %s does not match expected hash %.*s",
1668                             uri, (int) the_hash_algo->hexsz,
1669                             packfile_uris.items[i].string);
1670
1671                 string_list_append_nodup(pack_lockfiles,
1672                                          xstrfmt("%s/pack/pack-%s.keep",
1673                                                  get_object_directory(),
1674                                                  packname));
1675         }
1676         string_list_clear(&packfile_uris, 0);
1677
1678         if (negotiator)
1679                 negotiator->release(negotiator);
1680
1681         oidset_clear(&common);
1682         return ref;
1683 }
1684
1685 static int fetch_pack_config_cb(const char *var, const char *value, void *cb)
1686 {
1687         if (strcmp(var, "fetch.fsck.skiplist") == 0) {
1688                 const char *path;
1689
1690                 if (git_config_pathname(&path, var, value))
1691                         return 1;
1692                 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
1693                         fsck_msg_types.len ? ',' : '=', path);
1694                 free((char *)path);
1695                 return 0;
1696         }
1697
1698         if (skip_prefix(var, "fetch.fsck.", &var)) {
1699                 if (is_valid_msg_type(var, value))
1700                         strbuf_addf(&fsck_msg_types, "%c%s=%s",
1701                                 fsck_msg_types.len ? ',' : '=', var, value);
1702                 else
1703                         warning("Skipping unknown msg id '%s'", var);
1704                 return 0;
1705         }
1706
1707         return git_default_config(var, value, cb);
1708 }
1709
1710 static void fetch_pack_config(void)
1711 {
1712         git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit);
1713         git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit);
1714         git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta);
1715         git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects);
1716         git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects);
1717         git_config_get_bool("transfer.advertisesid", &advertise_sid);
1718         if (!uri_protocols.nr) {
1719                 char *str;
1720
1721                 if (!git_config_get_string("fetch.uriprotocols", &str) && str) {
1722                         string_list_split(&uri_protocols, str, ',', -1);
1723                         free(str);
1724                 }
1725         }
1726
1727         git_config(fetch_pack_config_cb, NULL);
1728 }
1729
1730 static void fetch_pack_setup(void)
1731 {
1732         static int did_setup;
1733         if (did_setup)
1734                 return;
1735         fetch_pack_config();
1736         if (0 <= transfer_unpack_limit)
1737                 unpack_limit = transfer_unpack_limit;
1738         else if (0 <= fetch_unpack_limit)
1739                 unpack_limit = fetch_unpack_limit;
1740         did_setup = 1;
1741 }
1742
1743 static int remove_duplicates_in_refs(struct ref **ref, int nr)
1744 {
1745         struct string_list names = STRING_LIST_INIT_NODUP;
1746         int src, dst;
1747
1748         for (src = dst = 0; src < nr; src++) {
1749                 struct string_list_item *item;
1750                 item = string_list_insert(&names, ref[src]->name);
1751                 if (item->util)
1752                         continue; /* already have it */
1753                 item->util = ref[src];
1754                 if (src != dst)
1755                         ref[dst] = ref[src];
1756                 dst++;
1757         }
1758         for (src = dst; src < nr; src++)
1759                 ref[src] = NULL;
1760         string_list_clear(&names, 0);
1761         return dst;
1762 }
1763
1764 static void update_shallow(struct fetch_pack_args *args,
1765                            struct ref **sought, int nr_sought,
1766                            struct shallow_info *si)
1767 {
1768         struct oid_array ref = OID_ARRAY_INIT;
1769         int *status;
1770         int i;
1771
1772         if (args->deepen && alternate_shallow_file) {
1773                 if (*alternate_shallow_file == '\0') { /* --unshallow */
1774                         unlink_or_warn(git_path_shallow(the_repository));
1775                         rollback_shallow_file(the_repository, &shallow_lock);
1776                 } else
1777                         commit_shallow_file(the_repository, &shallow_lock);
1778                 alternate_shallow_file = NULL;
1779                 return;
1780         }
1781
1782         if (!si->shallow || !si->shallow->nr)
1783                 return;
1784
1785         if (args->cloning) {
1786                 /*
1787                  * remote is shallow, but this is a clone, there are
1788                  * no objects in repo to worry about. Accept any
1789                  * shallow points that exist in the pack (iow in repo
1790                  * after get_pack() and reprepare_packed_git())
1791                  */
1792                 struct oid_array extra = OID_ARRAY_INIT;
1793                 struct object_id *oid = si->shallow->oid;
1794                 for (i = 0; i < si->shallow->nr; i++)
1795                         if (has_object_file(&oid[i]))
1796                                 oid_array_append(&extra, &oid[i]);
1797                 if (extra.nr) {
1798                         setup_alternate_shallow(&shallow_lock,
1799                                                 &alternate_shallow_file,
1800                                                 &extra);
1801                         commit_shallow_file(the_repository, &shallow_lock);
1802                         alternate_shallow_file = NULL;
1803                 }
1804                 oid_array_clear(&extra);
1805                 return;
1806         }
1807
1808         if (!si->nr_ours && !si->nr_theirs)
1809                 return;
1810
1811         remove_nonexistent_theirs_shallow(si);
1812         if (!si->nr_ours && !si->nr_theirs)
1813                 return;
1814         for (i = 0; i < nr_sought; i++)
1815                 oid_array_append(&ref, &sought[i]->old_oid);
1816         si->ref = &ref;
1817
1818         if (args->update_shallow) {
1819                 /*
1820                  * remote is also shallow, .git/shallow may be updated
1821                  * so all refs can be accepted. Make sure we only add
1822                  * shallow roots that are actually reachable from new
1823                  * refs.
1824                  */
1825                 struct oid_array extra = OID_ARRAY_INIT;
1826                 struct object_id *oid = si->shallow->oid;
1827                 assign_shallow_commits_to_refs(si, NULL, NULL);
1828                 if (!si->nr_ours && !si->nr_theirs) {
1829                         oid_array_clear(&ref);
1830                         return;
1831                 }
1832                 for (i = 0; i < si->nr_ours; i++)
1833                         oid_array_append(&extra, &oid[si->ours[i]]);
1834                 for (i = 0; i < si->nr_theirs; i++)
1835                         oid_array_append(&extra, &oid[si->theirs[i]]);
1836                 setup_alternate_shallow(&shallow_lock,
1837                                         &alternate_shallow_file,
1838                                         &extra);
1839                 commit_shallow_file(the_repository, &shallow_lock);
1840                 oid_array_clear(&extra);
1841                 oid_array_clear(&ref);
1842                 alternate_shallow_file = NULL;
1843                 return;
1844         }
1845
1846         /*
1847          * remote is also shallow, check what ref is safe to update
1848          * without updating .git/shallow
1849          */
1850         status = xcalloc(nr_sought, sizeof(*status));
1851         assign_shallow_commits_to_refs(si, NULL, status);
1852         if (si->nr_ours || si->nr_theirs) {
1853                 for (i = 0; i < nr_sought; i++)
1854                         if (status[i])
1855                                 sought[i]->status = REF_STATUS_REJECT_SHALLOW;
1856         }
1857         free(status);
1858         oid_array_clear(&ref);
1859 }
1860
1861 static int iterate_ref_map(void *cb_data, struct object_id *oid)
1862 {
1863         struct ref **rm = cb_data;
1864         struct ref *ref = *rm;
1865
1866         if (!ref)
1867                 return -1; /* end of the list */
1868         *rm = ref->next;
1869         oidcpy(oid, &ref->old_oid);
1870         return 0;
1871 }
1872
1873 struct ref *fetch_pack(struct fetch_pack_args *args,
1874                        int fd[],
1875                        const struct ref *ref,
1876                        struct ref **sought, int nr_sought,
1877                        struct oid_array *shallow,
1878                        struct string_list *pack_lockfiles,
1879                        enum protocol_version version)
1880 {
1881         struct ref *ref_cpy;
1882         struct shallow_info si;
1883         struct oid_array shallows_scratch = OID_ARRAY_INIT;
1884
1885         fetch_pack_setup();
1886         if (nr_sought)
1887                 nr_sought = remove_duplicates_in_refs(sought, nr_sought);
1888
1889         if (version != protocol_v2 && !ref) {
1890                 packet_flush(fd[1]);
1891                 die(_("no matching remote head"));
1892         }
1893         if (version == protocol_v2) {
1894                 if (shallow->nr)
1895                         BUG("Protocol V2 does not provide shallows at this point in the fetch");
1896                 memset(&si, 0, sizeof(si));
1897                 ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought,
1898                                            &shallows_scratch, &si,
1899                                            pack_lockfiles);
1900         } else {
1901                 prepare_shallow_info(&si, shallow);
1902                 ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
1903                                         &si, pack_lockfiles);
1904         }
1905         reprepare_packed_git(the_repository);
1906
1907         if (!args->cloning && args->deepen) {
1908                 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1909                 struct ref *iterator = ref_cpy;
1910                 opt.shallow_file = alternate_shallow_file;
1911                 if (args->deepen)
1912                         opt.is_deepening_fetch = 1;
1913                 if (check_connected(iterate_ref_map, &iterator, &opt)) {
1914                         error(_("remote did not send all necessary objects"));
1915                         free_refs(ref_cpy);
1916                         ref_cpy = NULL;
1917                         rollback_shallow_file(the_repository, &shallow_lock);
1918                         goto cleanup;
1919                 }
1920                 args->connectivity_checked = 1;
1921         }
1922
1923         update_shallow(args, sought, nr_sought, &si);
1924 cleanup:
1925         clear_shallow_info(&si);
1926         oid_array_clear(&shallows_scratch);
1927         return ref_cpy;
1928 }
1929
1930 int report_unmatched_refs(struct ref **sought, int nr_sought)
1931 {
1932         int i, ret = 0;
1933
1934         for (i = 0; i < nr_sought; i++) {
1935                 if (!sought[i])
1936                         continue;
1937                 switch (sought[i]->match_status) {
1938                 case REF_MATCHED:
1939                         continue;
1940                 case REF_NOT_MATCHED:
1941                         error(_("no such remote ref %s"), sought[i]->name);
1942                         break;
1943                 case REF_UNADVERTISED_NOT_ALLOWED:
1944                         error(_("Server does not allow request for unadvertised object %s"),
1945                               sought[i]->name);
1946                         break;
1947                 }
1948                 ret = 1;
1949         }
1950         return ret;
1951 }