send-pack.c

   1 #include "builtin.h"
   2 #include "config.h"
   3 #include "commit.h"
   4 #include "refs.h"
   5 #include "object-store.h"
   6 #include "pkt-line.h"
   7 #include "sideband.h"
   8 #include "run-command.h"
   9 #include "remote.h"
  10 #include "connect.h"
  11 #include "send-pack.h"
  12 #include "quote.h"
  13 #include "transport.h"
  14 #include "version.h"
  15 #include "oid-array.h"
  16 #include "gpg-interface.h"
  17 #include "cache.h"
  18 #include "shallow.h"
  19
  20 int option_parse_push_signed(const struct option *opt,
  21                              const char *arg, int unset)
  22 {
  23         if (unset) {
  24                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
  25                 return 0;
  26         }
  27         switch (git_parse_maybe_bool(arg)) {
  28         case 1:
  29                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
  30                 return 0;
  31         case 0:
  32                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
  33                 return 0;
  34         }
  35         if (!strcasecmp("if-asked", arg)) {
  36                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
  37                 return 0;
  38         }
  39         die("bad %s argument: %s", opt->long_name, arg);
  40 }
  41
  42 static void feed_object(const struct object_id *oid, FILE *fh, int negative)
  43 {
  44         if (negative &&
  45             !has_object_file_with_flags(oid,
  46                                         OBJECT_INFO_SKIP_FETCH_OBJECT |
  47                                         OBJECT_INFO_QUICK))
  48                 return;
  49
  50         if (negative)
  51                 putc('^', fh);
  52         fputs(oid_to_hex(oid), fh);
  53         putc('\n', fh);
  54 }
  55
  56 /*
  57  * Make a pack stream and spit it out into file descriptor fd
  58  */
  59 static int pack_objects(int fd, struct ref *refs, struct oid_array *extra, struct send_pack_args *args)
  60 {
  61         /*
  62          * The child becomes pack-objects --revs; we feed
  63          * the revision parameters to it via its stdin and
  64          * let its stdout go back to the other end.
  65          */
  66         struct child_process po = CHILD_PROCESS_INIT;
  67         FILE *po_in;
  68         int i;
  69         int rc;
  70
  71         strvec_push(&po.args, "pack-objects");
  72         strvec_push(&po.args, "--all-progress-implied");
  73         strvec_push(&po.args, "--revs");
  74         strvec_push(&po.args, "--stdout");
  75         if (args->use_thin_pack)
  76                 strvec_push(&po.args, "--thin");
  77         if (args->use_ofs_delta)
  78                 strvec_push(&po.args, "--delta-base-offset");
  79         if (args->quiet || !args->progress)
  80                 strvec_push(&po.args, "-q");
  81         if (args->progress)
  82                 strvec_push(&po.args, "--progress");
  83         if (is_repository_shallow(the_repository))
  84                 strvec_push(&po.args, "--shallow");
  85         po.in = -1;
  86         po.out = args->stateless_rpc ? -1 : fd;
  87         po.git_cmd = 1;
  88         if (start_command(&po))
  89                 die_errno("git pack-objects failed");
  90
  91         /*
  92          * We feed the pack-objects we just spawned with revision
  93          * parameters by writing to the pipe.
  94          */
  95         po_in = xfdopen(po.in, "w");
  96         for (i = 0; i < extra->nr; i++)
  97                 feed_object(&extra->oid[i], po_in, 1);
  98
  99         while (refs) {
 100                 if (!is_null_oid(&refs->old_oid))
 101                         feed_object(&refs->old_oid, po_in, 1);
 102                 if (!is_null_oid(&refs->new_oid))
 103                         feed_object(&refs->new_oid, po_in, 0);
 104                 refs = refs->next;
 105         }
 106
 107         fflush(po_in);
 108         if (ferror(po_in))
 109                 die_errno("error writing to pack-objects");
 110         fclose(po_in);
 111
 112         if (args->stateless_rpc) {
 113                 char *buf = xmalloc(LARGE_PACKET_MAX);
 114                 while (1) {
 115                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
 116                         if (n <= 0)
 117                                 break;
 118                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
 119                 }
 120                 free(buf);
 121                 close(po.out);
 122                 po.out = -1;
 123         }
 124
 125         rc = finish_command(&po);
 126         if (rc) {
 127                 /*
 128                  * For a normal non-zero exit, we assume pack-objects wrote
 129                  * something useful to stderr. For death by signal, though,
 130                  * we should mention it to the user. The exception is SIGPIPE
 131                  * (141), because that's a normal occurrence if the remote end
 132                  * hangs up (and we'll report that by trying to read the unpack
 133                  * status).
 134                  */
 135                 if (rc > 128 && rc != 141)
 136                         error("pack-objects died of signal %d", rc - 128);
 137                 return -1;
 138         }
 139         return 0;
 140 }
 141
 142 static int receive_unpack_status(struct packet_reader *reader)
 143 {
 144         if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 145                 return error(_("unexpected flush packet while reading remote unpack status"));
 146         if (!skip_prefix(reader->line, "unpack ", &reader->line))
 147                 return error(_("unable to parse remote unpack status: %s"), reader->line);
 148         if (strcmp(reader->line, "ok"))
 149                 return error(_("remote unpack failed: %s"), reader->line);
 150         return 0;
 151 }
 152
 153 static int receive_status(struct packet_reader *reader, struct ref *refs)
 154 {
 155         struct ref *hint;
 156         int ret;
 157         struct ref_push_report *report = NULL;
 158         int new_report = 0;
 159         int once = 0;
 160
 161         hint = NULL;
 162         ret = receive_unpack_status(reader);
 163         while (1) {
 164                 struct object_id old_oid, new_oid;
 165                 const char *head;
 166                 const char *refname;
 167                 char *p;
 168                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 169                         break;
 170                 head = reader->line;
 171                 p = strchr(head, ' ');
 172                 if (!p) {
 173                         error("invalid status line from remote: %s", reader->line);
 174                         ret = -1;
 175                         break;
 176                 }
 177                 *p++ = '\0';
 178
 179                 if (!strcmp(head, "option")) {
 180                         const char *key, *val;
 181
 182                         if (!hint || !(report || new_report)) {
 183                                 if (!once++)
 184                                         error("'option' without a matching 'ok/ng' directive");
 185                                 ret = -1;
 186                                 continue;
 187                         }
 188                         if (new_report) {
 189                                 if (!hint->report) {
 190                                         hint->report = xcalloc(1, sizeof(struct ref_push_report));
 191                                         report = hint->report;
 192                                 } else {
 193                                         report = hint->report;
 194                                         while (report->next)
 195                                                 report = report->next;
 196                                         report->next = xcalloc(1, sizeof(struct ref_push_report));
 197                                         report = report->next;
 198                                 }
 199                                 new_report = 0;
 200                         }
 201                         key = p;
 202                         p = strchr(key, ' ');
 203                         if (p)
 204                                 *p++ = '\0';
 205                         val = p;
 206                         if (!strcmp(key, "refname"))
 207                                 report->ref_name = xstrdup_or_null(val);
 208                         else if (!strcmp(key, "old-oid") && val &&
 209                                  !parse_oid_hex(val, &old_oid, &val))
 210                                 report->old_oid = oiddup(&old_oid);
 211                         else if (!strcmp(key, "new-oid") && val &&
 212                                  !parse_oid_hex(val, &new_oid, &val))
 213                                 report->new_oid = oiddup(&new_oid);
 214                         else if (!strcmp(key, "forced-update"))
 215                                 report->forced_update = 1;
 216                         continue;
 217                 }
 218
 219                 report = NULL;
 220                 new_report = 0;
 221                 if (strcmp(head, "ok") && strcmp(head, "ng")) {
 222                         error("invalid ref status from remote: %s", head);
 223                         ret = -1;
 224                         break;
 225                 }
 226                 refname = p;
 227                 p = strchr(refname, ' ');
 228                 if (p)
 229                         *p++ = '\0';
 230                 /* first try searching at our hint, falling back to all refs */
 231                 if (hint)
 232                         hint = find_ref_by_name(hint, refname);
 233                 if (!hint)
 234                         hint = find_ref_by_name(refs, refname);
 235                 if (!hint) {
 236                         warning("remote reported status on unknown ref: %s",
 237                                 refname);
 238                         continue;
 239                 }
 240                 if (hint->status != REF_STATUS_EXPECTING_REPORT &&
 241                     hint->status != REF_STATUS_OK &&
 242                     hint->status != REF_STATUS_REMOTE_REJECT) {
 243                         warning("remote reported status on unexpected ref: %s",
 244                                 refname);
 245                         continue;
 246                 }
 247                 if (!strcmp(head, "ng")) {
 248                         hint->status = REF_STATUS_REMOTE_REJECT;
 249                         if (p)
 250                                 hint->remote_status = xstrdup(p);
 251                         else
 252                                 hint->remote_status = "failed";
 253                 } else {
 254                         hint->status = REF_STATUS_OK;
 255                         hint->remote_status = xstrdup_or_null(p);
 256                         new_report = 1;
 257                 }
 258         }
 259         return ret;
 260 }
 261
 262 static int sideband_demux(int in, int out, void *data)
 263 {
 264         int *fd = data, ret;
 265         if (async_with_fork())
 266                 close(fd[1]);
 267         ret = recv_sideband("send-pack", fd[0], out);
 268         close(out);
 269         return ret;
 270 }
 271
 272 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 273 {
 274         struct strbuf *sb = cb;
 275         if (graft->nr_parent == -1)
 276                 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
 277         return 0;
 278 }
 279
 280 static void advertise_shallow_grafts_buf(struct strbuf *sb)
 281 {
 282         if (!is_repository_shallow(the_repository))
 283                 return;
 284         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 285 }
 286
 287 #define CHECK_REF_NO_PUSH -1
 288 #define CHECK_REF_STATUS_REJECTED -2
 289 #define CHECK_REF_UPTODATE -3
 290 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
 291 {
 292         if (!ref->peer_ref && !args->send_mirror)
 293                 return CHECK_REF_NO_PUSH;
 294
 295         /* Check for statuses set by set_ref_status_for_push() */
 296         switch (ref->status) {
 297         case REF_STATUS_REJECT_NONFASTFORWARD:
 298         case REF_STATUS_REJECT_ALREADY_EXISTS:
 299         case REF_STATUS_REJECT_FETCH_FIRST:
 300         case REF_STATUS_REJECT_NEEDS_FORCE:
 301         case REF_STATUS_REJECT_STALE:
 302         case REF_STATUS_REJECT_REMOTE_UPDATED:
 303         case REF_STATUS_REJECT_NODELETE:
 304                 return CHECK_REF_STATUS_REJECTED;
 305         case REF_STATUS_UPTODATE:
 306                 return CHECK_REF_UPTODATE;
 307
 308         default:
 309         case REF_STATUS_EXPECTING_REPORT:
 310                 /* already passed checks on the local side */
 311         case REF_STATUS_OK:
 312                 /* of course this is OK */
 313                 return 0;
 314         }
 315 }
 316
 317 /*
 318  * the beginning of the next line, or the end of buffer.
 319  *
 320  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 321  * convert many similar uses found by "git grep -A4 memchr".
 322  */
 323 static const char *next_line(const char *line, size_t len)
 324 {
 325         const char *nl = memchr(line, '\n', len);
 326         if (!nl)
 327                 return line + len; /* incomplete line */
 328         return nl + 1;
 329 }
 330
 331 static int generate_push_cert(struct strbuf *req_buf,
 332                               const struct ref *remote_refs,
 333                               struct send_pack_args *args,
 334                               const char *cap_string,
 335                               const char *push_cert_nonce)
 336 {
 337         const struct ref *ref;
 338         struct string_list_item *item;
 339         char *signing_key = xstrdup(get_signing_key());
 340         const char *cp, *np;
 341         struct strbuf cert = STRBUF_INIT;
 342         int update_seen = 0;
 343
 344         strbuf_addstr(&cert, "certificate version 0.1\n");
 345         strbuf_addf(&cert, "pusher %s ", signing_key);
 346         datestamp(&cert);
 347         strbuf_addch(&cert, '\n');
 348         if (args->url && *args->url) {
 349                 char *anon_url = transport_anonymize_url(args->url);
 350                 strbuf_addf(&cert, "pushee %s\n", anon_url);
 351                 free(anon_url);
 352         }
 353         if (push_cert_nonce[0])
 354                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
 355         if (args->push_options)
 356                 for_each_string_list_item(item, args->push_options)
 357                         strbuf_addf(&cert, "push-option %s\n", item->string);
 358         strbuf_addstr(&cert, "\n");
 359
 360         for (ref = remote_refs; ref; ref = ref->next) {
 361                 if (check_to_send_update(ref, args) < 0)
 362                         continue;
 363                 update_seen = 1;
 364                 strbuf_addf(&cert, "%s %s %s\n",
 365                             oid_to_hex(&ref->old_oid),
 366                             oid_to_hex(&ref->new_oid),
 367                             ref->name);
 368         }
 369         if (!update_seen)
 370                 goto free_return;
 371
 372         if (sign_buffer(&cert, &cert, signing_key))
 373                 die(_("failed to sign the push certificate"));
 374
 375         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 376         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 377                 np = next_line(cp, cert.buf + cert.len - cp);
 378                 packet_buf_write(req_buf,
 379                                  "%.*s", (int)(np - cp), cp);
 380         }
 381         packet_buf_write(req_buf, "push-cert-end\n");
 382
 383 free_return:
 384         free(signing_key);
 385         strbuf_release(&cert);
 386         return update_seen;
 387 }
 388
 389 #define NONCE_LEN_LIMIT 256
 390
 391 static void reject_invalid_nonce(const char *nonce, int len)
 392 {
 393         int i = 0;
 394
 395         if (NONCE_LEN_LIMIT <= len)
 396                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 397                     len, nonce);
 398
 399         for (i = 0; i < len; i++) {
 400                 int ch = nonce[i] & 0xFF;
 401                 if (isalnum(ch) ||
 402                     ch == '-' || ch == '.' ||
 403                     ch == '/' || ch == '+' ||
 404                     ch == '=' || ch == '_')
 405                         continue;
 406                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 407                     len, nonce);
 408         }
 409 }
 410
 411 int send_pack(struct send_pack_args *args,
 412               int fd[], struct child_process *conn,
 413               struct ref *remote_refs,
 414               struct oid_array *extra_have)
 415 {
 416         int in = fd[0];
 417         int out = fd[1];
 418         struct strbuf req_buf = STRBUF_INIT;
 419         struct strbuf cap_buf = STRBUF_INIT;
 420         struct ref *ref;
 421         int need_pack_data = 0;
 422         int allow_deleting_refs = 0;
 423         int status_report = 0;
 424         int use_sideband = 0;
 425         int quiet_supported = 0;
 426         int agent_supported = 0;
 427         int use_atomic = 0;
 428         int atomic_supported = 0;
 429         int use_push_options = 0;
 430         int push_options_supported = 0;
 431         int object_format_supported = 0;
 432         unsigned cmds_sent = 0;
 433         int ret;
 434         struct async demux;
 435         const char *push_cert_nonce = NULL;
 436         struct packet_reader reader;
 437
 438         /* Does the other end support the reporting? */
 439         if (server_supports("report-status-v2"))
 440                 status_report = 2;
 441         else if (server_supports("report-status"))
 442                 status_report = 1;
 443         if (server_supports("delete-refs"))
 444                 allow_deleting_refs = 1;
 445         if (server_supports("ofs-delta"))
 446                 args->use_ofs_delta = 1;
 447         if (server_supports("side-band-64k"))
 448                 use_sideband = 1;
 449         if (server_supports("quiet"))
 450                 quiet_supported = 1;
 451         if (server_supports("agent"))
 452                 agent_supported = 1;
 453         if (server_supports("no-thin"))
 454                 args->use_thin_pack = 0;
 455         if (server_supports("atomic"))
 456                 atomic_supported = 1;
 457         if (server_supports("push-options"))
 458                 push_options_supported = 1;
 459
 460         if (!server_supports_hash(the_hash_algo->name, &object_format_supported))
 461                 die(_("the receiving end does not support this repository's hash algorithm"));
 462
 463         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
 464                 int len;
 465                 push_cert_nonce = server_feature_value("push-cert", &len);
 466                 if (push_cert_nonce) {
 467                         reject_invalid_nonce(push_cert_nonce, len);
 468                         push_cert_nonce = xmemdupz(push_cert_nonce, len);
 469                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
 470                         die(_("the receiving end does not support --signed push"));
 471                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
 472                         warning(_("not sending a push certificate since the"
 473                                   " receiving end does not support --signed"
 474                                   " push"));
 475                 }
 476         }
 477
 478         if (!remote_refs) {
 479                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 480                         "Perhaps you should specify a branch.\n");
 481                 return 0;
 482         }
 483         if (args->atomic && !atomic_supported)
 484                 die(_("the receiving end does not support --atomic push"));
 485
 486         use_atomic = atomic_supported && args->atomic;
 487
 488         if (args->push_options && !push_options_supported)
 489                 die(_("the receiving end does not support push options"));
 490
 491         use_push_options = push_options_supported && args->push_options;
 492
 493         if (status_report == 1)
 494                 strbuf_addstr(&cap_buf, " report-status");
 495         else if (status_report == 2)
 496                 strbuf_addstr(&cap_buf, " report-status-v2");
 497         if (use_sideband)
 498                 strbuf_addstr(&cap_buf, " side-band-64k");
 499         if (quiet_supported && (args->quiet || !args->progress))
 500                 strbuf_addstr(&cap_buf, " quiet");
 501         if (use_atomic)
 502                 strbuf_addstr(&cap_buf, " atomic");
 503         if (use_push_options)
 504                 strbuf_addstr(&cap_buf, " push-options");
 505         if (object_format_supported)
 506                 strbuf_addf(&cap_buf, " object-format=%s", the_hash_algo->name);
 507         if (agent_supported)
 508                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 509
 510         /*
 511          * NEEDSWORK: why does delete-refs have to be so specific to
 512          * send-pack machinery that set_ref_status_for_push() cannot
 513          * set this bit for us???
 514          */
 515         for (ref = remote_refs; ref; ref = ref->next)
 516                 if (ref->deletion && !allow_deleting_refs)
 517                         ref->status = REF_STATUS_REJECT_NODELETE;
 518
 519         /*
 520          * Clear the status for each ref and see if we need to send
 521          * the pack data.
 522          */
 523         for (ref = remote_refs; ref; ref = ref->next) {
 524                 switch (check_to_send_update(ref, args)) {
 525                 case 0: /* no error */
 526                         break;
 527                 case CHECK_REF_STATUS_REJECTED:
 528                         /*
 529                          * When we know the server would reject a ref update if
 530                          * we were to send it and we're trying to send the refs
 531                          * atomically, abort the whole operation.
 532                          */
 533                         if (use_atomic) {
 534                                 strbuf_release(&req_buf);
 535                                 strbuf_release(&cap_buf);
 536                                 reject_atomic_push(remote_refs, args->send_mirror);
 537                                 error("atomic push failed for ref %s. status: %d\n",
 538                                       ref->name, ref->status);
 539                                 return args->porcelain ? 0 : -1;
 540                         }
 541                         /* else fallthrough */
 542                 default:
 543                         continue;
 544                 }
 545                 if (!ref->deletion)
 546                         need_pack_data = 1;
 547
 548                 if (args->dry_run || !status_report)
 549                         ref->status = REF_STATUS_OK;
 550                 else
 551                         ref->status = REF_STATUS_EXPECTING_REPORT;
 552         }
 553
 554         if (!args->dry_run)
 555                 advertise_shallow_grafts_buf(&req_buf);
 556
 557         /*
 558          * Finally, tell the other end!
 559          */
 560         if (!args->dry_run && push_cert_nonce)
 561                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 562                                                cap_buf.buf, push_cert_nonce);
 563         else if (!args->dry_run)
 564                 for (ref = remote_refs; ref; ref = ref->next) {
 565                         char *old_hex, *new_hex;
 566
 567                         if (check_to_send_update(ref, args) < 0)
 568                                 continue;
 569
 570                         old_hex = oid_to_hex(&ref->old_oid);
 571                         new_hex = oid_to_hex(&ref->new_oid);
 572                         if (!cmds_sent) {
 573                                 packet_buf_write(&req_buf,
 574                                                  "%s %s %s%c%s",
 575                                                  old_hex, new_hex, ref->name, 0,
 576                                                  cap_buf.buf);
 577                                 cmds_sent = 1;
 578                         } else {
 579                                 packet_buf_write(&req_buf, "%s %s %s",
 580                                                  old_hex, new_hex, ref->name);
 581                         }
 582                 }
 583
 584         if (use_push_options) {
 585                 struct string_list_item *item;
 586
 587                 packet_buf_flush(&req_buf);
 588                 for_each_string_list_item(item, args->push_options)
 589                         packet_buf_write(&req_buf, "%s", item->string);
 590         }
 591
 592         if (args->stateless_rpc) {
 593                 if (!args->dry_run && (cmds_sent || is_repository_shallow(the_repository))) {
 594                         packet_buf_flush(&req_buf);
 595                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 596                 }
 597         } else {
 598                 write_or_die(out, req_buf.buf, req_buf.len);
 599                 packet_flush(out);
 600         }
 601         strbuf_release(&req_buf);
 602         strbuf_release(&cap_buf);
 603
 604         if (use_sideband && cmds_sent) {
 605                 memset(&demux, 0, sizeof(demux));
 606                 demux.proc = sideband_demux;
 607                 demux.data = fd;
 608                 demux.out = -1;
 609                 demux.isolate_sigpipe = 1;
 610                 if (start_async(&demux))
 611                         die("send-pack: unable to fork off sideband demultiplexer");
 612                 in = demux.out;
 613         }
 614
 615         packet_reader_init(&reader, in, NULL, 0,
 616                            PACKET_READ_CHOMP_NEWLINE |
 617                            PACKET_READ_DIE_ON_ERR_PACKET);
 618
 619         if (need_pack_data && cmds_sent) {
 620                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 621                         if (args->stateless_rpc)
 622                                 close(out);
 623                         if (git_connection_is_socket(conn))
 624                                 shutdown(fd[0], SHUT_WR);
 625
 626                         /*
 627                          * Do not even bother with the return value; we know we
 628                          * are failing, and just want the error() side effects,
 629                          * as well as marking refs with their remote status (if
 630                          * we get one).
 631                          */
 632                         if (status_report)
 633                                 receive_status(&reader, remote_refs);
 634
 635                         if (use_sideband) {
 636                                 close(demux.out);
 637                                 finish_async(&demux);
 638                         }
 639                         fd[1] = -1;
 640                         return -1;
 641                 }
 642                 if (!args->stateless_rpc)
 643                         /* Closed by pack_objects() via start_command() */
 644                         fd[1] = -1;
 645         }
 646         if (args->stateless_rpc && cmds_sent)
 647                 packet_flush(out);
 648
 649         if (status_report && cmds_sent)
 650                 ret = receive_status(&reader, remote_refs);
 651         else
 652                 ret = 0;
 653         if (args->stateless_rpc)
 654                 packet_flush(out);
 655
 656         if (use_sideband && cmds_sent) {
 657                 close(demux.out);
 658                 if (finish_async(&demux)) {
 659                         error("error in sideband demultiplexer");
 660                         ret = -1;
 661                 }
 662         }
 663
 664         if (ret < 0)
 665                 return ret;
 666
 667         if (args->porcelain)
 668                 return 0;
 669
 670         for (ref = remote_refs; ref; ref = ref->next) {
 671                 switch (ref->status) {
 672                 case REF_STATUS_NONE:
 673                 case REF_STATUS_UPTODATE:
 674                 case REF_STATUS_OK:
 675                         break;
 676                 default:
 677                         return -1;
 678                 }
 679         }
 680         return 0;
 681 }