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