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 *advertised,
  60                         struct oid_array *negotiated,
  61                         struct send_pack_args *args)
  62 {
  63         /*
  64          * The child becomes pack-objects --revs; we feed
  65          * the revision parameters to it via its stdin and
  66          * let its stdout go back to the other end.
  67          */
  68         struct child_process po = CHILD_PROCESS_INIT;
  69         FILE *po_in;
  70         int i;
  71         int rc;
  72
  73         strvec_push(&po.args, "pack-objects");
  74         strvec_push(&po.args, "--all-progress-implied");
  75         strvec_push(&po.args, "--revs");
  76         strvec_push(&po.args, "--stdout");
  77         if (args->use_thin_pack)
  78                 strvec_push(&po.args, "--thin");
  79         if (args->use_ofs_delta)
  80                 strvec_push(&po.args, "--delta-base-offset");
  81         if (args->quiet || !args->progress)
  82                 strvec_push(&po.args, "-q");
  83         if (args->progress)
  84                 strvec_push(&po.args, "--progress");
  85         if (is_repository_shallow(the_repository))
  86                 strvec_push(&po.args, "--shallow");
  87         po.in = -1;
  88         po.out = args->stateless_rpc ? -1 : fd;
  89         po.git_cmd = 1;
  90         po.clean_on_exit = 1;
  91         if (start_command(&po))
  92                 die_errno("git pack-objects failed");
  93
  94         /*
  95          * We feed the pack-objects we just spawned with revision
  96          * parameters by writing to the pipe.
  97          */
  98         po_in = xfdopen(po.in, "w");
  99         for (i = 0; i < advertised->nr; i++)
 100                 feed_object(&advertised->oid[i], po_in, 1);
 101         for (i = 0; i < negotiated->nr; i++)
 102                 feed_object(&negotiated->oid[i], po_in, 1);
 103
 104         while (refs) {
 105                 if (!is_null_oid(&refs->old_oid))
 106                         feed_object(&refs->old_oid, po_in, 1);
 107                 if (!is_null_oid(&refs->new_oid))
 108                         feed_object(&refs->new_oid, po_in, 0);
 109                 refs = refs->next;
 110         }
 111
 112         fflush(po_in);
 113         if (ferror(po_in))
 114                 die_errno("error writing to pack-objects");
 115         fclose(po_in);
 116
 117         if (args->stateless_rpc) {
 118                 char *buf = xmalloc(LARGE_PACKET_MAX);
 119                 while (1) {
 120                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
 121                         if (n <= 0)
 122                                 break;
 123                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
 124                 }
 125                 free(buf);
 126                 close(po.out);
 127                 po.out = -1;
 128         }
 129
 130         rc = finish_command(&po);
 131         if (rc) {
 132                 /*
 133                  * For a normal non-zero exit, we assume pack-objects wrote
 134                  * something useful to stderr. For death by signal, though,
 135                  * we should mention it to the user. The exception is SIGPIPE
 136                  * (141), because that's a normal occurrence if the remote end
 137                  * hangs up (and we'll report that by trying to read the unpack
 138                  * status).
 139                  */
 140                 if (rc > 128 && rc != 141)
 141                         error("pack-objects died of signal %d", rc - 128);
 142                 return -1;
 143         }
 144         return 0;
 145 }
 146
 147 static int receive_unpack_status(struct packet_reader *reader)
 148 {
 149         if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 150                 return error(_("unexpected flush packet while reading remote unpack status"));
 151         if (!skip_prefix(reader->line, "unpack ", &reader->line))
 152                 return error(_("unable to parse remote unpack status: %s"), reader->line);
 153         if (strcmp(reader->line, "ok"))
 154                 return error(_("remote unpack failed: %s"), reader->line);
 155         return 0;
 156 }
 157
 158 static int receive_status(struct packet_reader *reader, struct ref *refs)
 159 {
 160         struct ref *hint;
 161         int ret;
 162         struct ref_push_report *report = NULL;
 163         int new_report = 0;
 164         int once = 0;
 165
 166         hint = NULL;
 167         ret = receive_unpack_status(reader);
 168         while (1) {
 169                 struct object_id old_oid, new_oid;
 170                 const char *head;
 171                 const char *refname;
 172                 char *p;
 173                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 174                         break;
 175                 head = reader->line;
 176                 p = strchr(head, ' ');
 177                 if (!p) {
 178                         error("invalid status line from remote: %s", reader->line);
 179                         ret = -1;
 180                         break;
 181                 }
 182                 *p++ = '\0';
 183
 184                 if (!strcmp(head, "option")) {
 185                         const char *key, *val;
 186
 187                         if (!hint || !(report || new_report)) {
 188                                 if (!once++)
 189                                         error("'option' without a matching 'ok/ng' directive");
 190                                 ret = -1;
 191                                 continue;
 192                         }
 193                         if (new_report) {
 194                                 if (!hint->report) {
 195                                         CALLOC_ARRAY(hint->report, 1);
 196                                         report = hint->report;
 197                                 } else {
 198                                         report = hint->report;
 199                                         while (report->next)
 200                                                 report = report->next;
 201                                         CALLOC_ARRAY(report->next, 1);
 202                                         report = report->next;
 203                                 }
 204                                 new_report = 0;
 205                         }
 206                         key = p;
 207                         p = strchr(key, ' ');
 208                         if (p)
 209                                 *p++ = '\0';
 210                         val = p;
 211                         if (!strcmp(key, "refname"))
 212                                 report->ref_name = xstrdup_or_null(val);
 213                         else if (!strcmp(key, "old-oid") && val &&
 214                                  !parse_oid_hex(val, &old_oid, &val))
 215                                 report->old_oid = oiddup(&old_oid);
 216                         else if (!strcmp(key, "new-oid") && val &&
 217                                  !parse_oid_hex(val, &new_oid, &val))
 218                                 report->new_oid = oiddup(&new_oid);
 219                         else if (!strcmp(key, "forced-update"))
 220                                 report->forced_update = 1;
 221                         continue;
 222                 }
 223
 224                 report = NULL;
 225                 new_report = 0;
 226                 if (strcmp(head, "ok") && strcmp(head, "ng")) {
 227                         error("invalid ref status from remote: %s", head);
 228                         ret = -1;
 229                         break;
 230                 }
 231                 refname = p;
 232                 p = strchr(refname, ' ');
 233                 if (p)
 234                         *p++ = '\0';
 235                 /* first try searching at our hint, falling back to all refs */
 236                 if (hint)
 237                         hint = find_ref_by_name(hint, refname);
 238                 if (!hint)
 239                         hint = find_ref_by_name(refs, refname);
 240                 if (!hint) {
 241                         warning("remote reported status on unknown ref: %s",
 242                                 refname);
 243                         continue;
 244                 }
 245                 if (hint->status != REF_STATUS_EXPECTING_REPORT &&
 246                     hint->status != REF_STATUS_OK &&
 247                     hint->status != REF_STATUS_REMOTE_REJECT) {
 248                         warning("remote reported status on unexpected ref: %s",
 249                                 refname);
 250                         continue;
 251                 }
 252                 if (!strcmp(head, "ng")) {
 253                         hint->status = REF_STATUS_REMOTE_REJECT;
 254                         if (p)
 255                                 hint->remote_status = xstrdup(p);
 256                         else
 257                                 hint->remote_status = "failed";
 258                 } else {
 259                         hint->status = REF_STATUS_OK;
 260                         hint->remote_status = xstrdup_or_null(p);
 261                         new_report = 1;
 262                 }
 263         }
 264         return ret;
 265 }
 266
 267 static int sideband_demux(int in, int out, void *data)
 268 {
 269         int *fd = data, ret;
 270         if (async_with_fork())
 271                 close(fd[1]);
 272         ret = recv_sideband("send-pack", fd[0], out);
 273         close(out);
 274         return ret;
 275 }
 276
 277 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 278 {
 279         struct strbuf *sb = cb;
 280         if (graft->nr_parent == -1)
 281                 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
 282         return 0;
 283 }
 284
 285 static void advertise_shallow_grafts_buf(struct strbuf *sb)
 286 {
 287         if (!is_repository_shallow(the_repository))
 288                 return;
 289         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 290 }
 291
 292 #define CHECK_REF_NO_PUSH -1
 293 #define CHECK_REF_STATUS_REJECTED -2
 294 #define CHECK_REF_UPTODATE -3
 295 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
 296 {
 297         if (!ref->peer_ref && !args->send_mirror)
 298                 return CHECK_REF_NO_PUSH;
 299
 300         /* Check for statuses set by set_ref_status_for_push() */
 301         switch (ref->status) {
 302         case REF_STATUS_REJECT_NONFASTFORWARD:
 303         case REF_STATUS_REJECT_ALREADY_EXISTS:
 304         case REF_STATUS_REJECT_FETCH_FIRST:
 305         case REF_STATUS_REJECT_NEEDS_FORCE:
 306         case REF_STATUS_REJECT_STALE:
 307         case REF_STATUS_REJECT_REMOTE_UPDATED:
 308         case REF_STATUS_REJECT_NODELETE:
 309                 return CHECK_REF_STATUS_REJECTED;
 310         case REF_STATUS_UPTODATE:
 311                 return CHECK_REF_UPTODATE;
 312
 313         default:
 314         case REF_STATUS_EXPECTING_REPORT:
 315                 /* already passed checks on the local side */
 316         case REF_STATUS_OK:
 317                 /* of course this is OK */
 318                 return 0;
 319         }
 320 }
 321
 322 /*
 323  * the beginning of the next line, or the end of buffer.
 324  *
 325  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 326  * convert many similar uses found by "git grep -A4 memchr".
 327  */
 328 static const char *next_line(const char *line, size_t len)
 329 {
 330         const char *nl = memchr(line, '\n', len);
 331         if (!nl)
 332                 return line + len; /* incomplete line */
 333         return nl + 1;
 334 }
 335
 336 static int generate_push_cert(struct strbuf *req_buf,
 337                               const struct ref *remote_refs,
 338                               struct send_pack_args *args,
 339                               const char *cap_string,
 340                               const char *push_cert_nonce)
 341 {
 342         const struct ref *ref;
 343         struct string_list_item *item;
 344         char *signing_key_id = xstrdup(get_signing_key_id());
 345         const char *cp, *np;
 346         struct strbuf cert = STRBUF_INIT;
 347         int update_seen = 0;
 348
 349         strbuf_addstr(&cert, "certificate version 0.1\n");
 350         strbuf_addf(&cert, "pusher %s ", signing_key_id);
 351         datestamp(&cert);
 352         strbuf_addch(&cert, '\n');
 353         if (args->url && *args->url) {
 354                 char *anon_url = transport_anonymize_url(args->url);
 355                 strbuf_addf(&cert, "pushee %s\n", anon_url);
 356                 free(anon_url);
 357         }
 358         if (push_cert_nonce[0])
 359                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
 360         if (args->push_options)
 361                 for_each_string_list_item(item, args->push_options)
 362                         strbuf_addf(&cert, "push-option %s\n", item->string);
 363         strbuf_addstr(&cert, "\n");
 364
 365         for (ref = remote_refs; ref; ref = ref->next) {
 366                 if (check_to_send_update(ref, args) < 0)
 367                         continue;
 368                 update_seen = 1;
 369                 strbuf_addf(&cert, "%s %s %s\n",
 370                             oid_to_hex(&ref->old_oid),
 371                             oid_to_hex(&ref->new_oid),
 372                             ref->name);
 373         }
 374         if (!update_seen)
 375                 goto free_return;
 376
 377         if (sign_buffer(&cert, &cert, get_signing_key()))
 378                 die(_("failed to sign the push certificate"));
 379
 380         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 381         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 382                 np = next_line(cp, cert.buf + cert.len - cp);
 383                 packet_buf_write(req_buf,
 384                                  "%.*s", (int)(np - cp), cp);
 385         }
 386         packet_buf_write(req_buf, "push-cert-end\n");
 387
 388 free_return:
 389         free(signing_key_id);
 390         strbuf_release(&cert);
 391         return update_seen;
 392 }
 393
 394 #define NONCE_LEN_LIMIT 256
 395
 396 static void reject_invalid_nonce(const char *nonce, int len)
 397 {
 398         int i = 0;
 399
 400         if (NONCE_LEN_LIMIT <= len)
 401                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 402                     len, nonce);
 403
 404         for (i = 0; i < len; i++) {
 405                 int ch = nonce[i] & 0xFF;
 406                 if (isalnum(ch) ||
 407                     ch == '-' || ch == '.' ||
 408                     ch == '/' || ch == '+' ||
 409                     ch == '=' || ch == '_')
 410                         continue;
 411                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 412                     len, nonce);
 413         }
 414 }
 415
 416 static void get_commons_through_negotiation(const char *url,
 417                                             const struct ref *remote_refs,
 418                                             struct oid_array *commons)
 419 {
 420         struct child_process child = CHILD_PROCESS_INIT;
 421         const struct ref *ref;
 422         int len = the_hash_algo->hexsz + 1; /* hash + NL */
 423
 424         child.git_cmd = 1;
 425         child.no_stdin = 1;
 426         child.out = -1;
 427         strvec_pushl(&child.args, "fetch", "--negotiate-only", NULL);
 428         for (ref = remote_refs; ref; ref = ref->next)
 429                 strvec_pushf(&child.args, "--negotiation-tip=%s", oid_to_hex(&ref->new_oid));
 430         strvec_push(&child.args, url);
 431
 432         if (start_command(&child))
 433                 die(_("send-pack: unable to fork off fetch subprocess"));
 434
 435         do {
 436                 char hex_hash[GIT_MAX_HEXSZ + 1];
 437                 int read_len = read_in_full(child.out, hex_hash, len);
 438                 struct object_id oid;
 439                 const char *end;
 440
 441                 if (!read_len)
 442                         break;
 443                 if (read_len != len)
 444                         die("invalid length read %d", read_len);
 445                 if (parse_oid_hex(hex_hash, &oid, &end) || *end != '\n')
 446                         die("invalid hash");
 447                 oid_array_append(commons, &oid);
 448         } while (1);
 449
 450         if (finish_command(&child)) {
 451                 /*
 452                  * The information that push negotiation provides is useful but
 453                  * not mandatory.
 454                  */
 455                 warning(_("push negotiation failed; proceeding anyway with push"));
 456         }
 457 }
 458
 459 int send_pack(struct send_pack_args *args,
 460               int fd[], struct child_process *conn,
 461               struct ref *remote_refs,
 462               struct oid_array *extra_have)
 463 {
 464         struct oid_array commons = OID_ARRAY_INIT;
 465         int in = fd[0];
 466         int out = fd[1];
 467         struct strbuf req_buf = STRBUF_INIT;
 468         struct strbuf cap_buf = STRBUF_INIT;
 469         struct ref *ref;
 470         int need_pack_data = 0;
 471         int allow_deleting_refs = 0;
 472         int status_report = 0;
 473         int use_sideband = 0;
 474         int quiet_supported = 0;
 475         int agent_supported = 0;
 476         int advertise_sid = 0;
 477         int push_negotiate = 0;
 478         int use_atomic = 0;
 479         int atomic_supported = 0;
 480         int use_push_options = 0;
 481         int push_options_supported = 0;
 482         int object_format_supported = 0;
 483         unsigned cmds_sent = 0;
 484         int ret;
 485         struct async demux;
 486         const char *push_cert_nonce = NULL;
 487         struct packet_reader reader;
 488
 489         if (!remote_refs) {
 490                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 491                         "Perhaps you should specify a branch.\n");
 492                 return 0;
 493         }
 494
 495         git_config_get_bool("push.negotiate", &push_negotiate);
 496         if (push_negotiate)
 497                 get_commons_through_negotiation(args->url, remote_refs, &commons);
 498
 499         git_config_get_bool("transfer.advertisesid", &advertise_sid);
 500
 501         /* Does the other end support the reporting? */
 502         if (server_supports("report-status-v2"))
 503                 status_report = 2;
 504         else if (server_supports("report-status"))
 505                 status_report = 1;
 506         if (server_supports("delete-refs"))
 507                 allow_deleting_refs = 1;
 508         if (server_supports("ofs-delta"))
 509                 args->use_ofs_delta = 1;
 510         if (server_supports("side-band-64k"))
 511                 use_sideband = 1;
 512         if (server_supports("quiet"))
 513                 quiet_supported = 1;
 514         if (server_supports("agent"))
 515                 agent_supported = 1;
 516         if (!server_supports("session-id"))
 517                 advertise_sid = 0;
 518         if (server_supports("no-thin"))
 519                 args->use_thin_pack = 0;
 520         if (server_supports("atomic"))
 521                 atomic_supported = 1;
 522         if (server_supports("push-options"))
 523                 push_options_supported = 1;
 524
 525         if (!server_supports_hash(the_hash_algo->name, &object_format_supported))
 526                 die(_("the receiving end does not support this repository's hash algorithm"));
 527
 528         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
 529                 int len;
 530                 push_cert_nonce = server_feature_value("push-cert", &len);
 531                 if (push_cert_nonce) {
 532                         reject_invalid_nonce(push_cert_nonce, len);
 533                         push_cert_nonce = xmemdupz(push_cert_nonce, len);
 534                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
 535                         die(_("the receiving end does not support --signed push"));
 536                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
 537                         warning(_("not sending a push certificate since the"
 538                                   " receiving end does not support --signed"
 539                                   " push"));
 540                 }
 541         }
 542
 543         if (args->atomic && !atomic_supported)
 544                 die(_("the receiving end does not support --atomic push"));
 545
 546         use_atomic = atomic_supported && args->atomic;
 547
 548         if (args->push_options && !push_options_supported)
 549                 die(_("the receiving end does not support push options"));
 550
 551         use_push_options = push_options_supported && args->push_options;
 552
 553         if (status_report == 1)
 554                 strbuf_addstr(&cap_buf, " report-status");
 555         else if (status_report == 2)
 556                 strbuf_addstr(&cap_buf, " report-status-v2");
 557         if (use_sideband)
 558                 strbuf_addstr(&cap_buf, " side-band-64k");
 559         if (quiet_supported && (args->quiet || !args->progress))
 560                 strbuf_addstr(&cap_buf, " quiet");
 561         if (use_atomic)
 562                 strbuf_addstr(&cap_buf, " atomic");
 563         if (use_push_options)
 564                 strbuf_addstr(&cap_buf, " push-options");
 565         if (object_format_supported)
 566                 strbuf_addf(&cap_buf, " object-format=%s", the_hash_algo->name);
 567         if (agent_supported)
 568                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 569         if (advertise_sid)
 570                 strbuf_addf(&cap_buf, " session-id=%s", trace2_session_id());
 571
 572         /*
 573          * NEEDSWORK: why does delete-refs have to be so specific to
 574          * send-pack machinery that set_ref_status_for_push() cannot
 575          * set this bit for us???
 576          */
 577         for (ref = remote_refs; ref; ref = ref->next)
 578                 if (ref->deletion && !allow_deleting_refs)
 579                         ref->status = REF_STATUS_REJECT_NODELETE;
 580
 581         /*
 582          * Clear the status for each ref and see if we need to send
 583          * the pack data.
 584          */
 585         for (ref = remote_refs; ref; ref = ref->next) {
 586                 switch (check_to_send_update(ref, args)) {
 587                 case 0: /* no error */
 588                         break;
 589                 case CHECK_REF_STATUS_REJECTED:
 590                         /*
 591                          * When we know the server would reject a ref update if
 592                          * we were to send it and we're trying to send the refs
 593                          * atomically, abort the whole operation.
 594                          */
 595                         if (use_atomic) {
 596                                 strbuf_release(&req_buf);
 597                                 strbuf_release(&cap_buf);
 598                                 reject_atomic_push(remote_refs, args->send_mirror);
 599                                 error("atomic push failed for ref %s. status: %d\n",
 600                                       ref->name, ref->status);
 601                                 return args->porcelain ? 0 : -1;
 602                         }
 603                         /* else fallthrough */
 604                 default:
 605                         continue;
 606                 }
 607                 if (!ref->deletion)
 608                         need_pack_data = 1;
 609
 610                 if (args->dry_run || !status_report)
 611                         ref->status = REF_STATUS_OK;
 612                 else
 613                         ref->status = REF_STATUS_EXPECTING_REPORT;
 614         }
 615
 616         if (!args->dry_run)
 617                 advertise_shallow_grafts_buf(&req_buf);
 618
 619         /*
 620          * Finally, tell the other end!
 621          */
 622         if (!args->dry_run && push_cert_nonce)
 623                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 624                                                cap_buf.buf, push_cert_nonce);
 625         else if (!args->dry_run)
 626                 for (ref = remote_refs; ref; ref = ref->next) {
 627                         char *old_hex, *new_hex;
 628
 629                         if (check_to_send_update(ref, args) < 0)
 630                                 continue;
 631
 632                         old_hex = oid_to_hex(&ref->old_oid);
 633                         new_hex = oid_to_hex(&ref->new_oid);
 634                         if (!cmds_sent) {
 635                                 packet_buf_write(&req_buf,
 636                                                  "%s %s %s%c%s",
 637                                                  old_hex, new_hex, ref->name, 0,
 638                                                  cap_buf.buf);
 639                                 cmds_sent = 1;
 640                         } else {
 641                                 packet_buf_write(&req_buf, "%s %s %s",
 642                                                  old_hex, new_hex, ref->name);
 643                         }
 644                 }
 645
 646         if (use_push_options) {
 647                 struct string_list_item *item;
 648
 649                 packet_buf_flush(&req_buf);
 650                 for_each_string_list_item(item, args->push_options)
 651                         packet_buf_write(&req_buf, "%s", item->string);
 652         }
 653
 654         if (args->stateless_rpc) {
 655                 if (!args->dry_run && (cmds_sent || is_repository_shallow(the_repository))) {
 656                         packet_buf_flush(&req_buf);
 657                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 658                 }
 659         } else {
 660                 write_or_die(out, req_buf.buf, req_buf.len);
 661                 packet_flush(out);
 662         }
 663         strbuf_release(&req_buf);
 664         strbuf_release(&cap_buf);
 665
 666         if (use_sideband && cmds_sent) {
 667                 memset(&demux, 0, sizeof(demux));
 668                 demux.proc = sideband_demux;
 669                 demux.data = fd;
 670                 demux.out = -1;
 671                 demux.isolate_sigpipe = 1;
 672                 if (start_async(&demux))
 673                         die("send-pack: unable to fork off sideband demultiplexer");
 674                 in = demux.out;
 675         }
 676
 677         packet_reader_init(&reader, in, NULL, 0,
 678                            PACKET_READ_CHOMP_NEWLINE |
 679                            PACKET_READ_DIE_ON_ERR_PACKET);
 680
 681         if (need_pack_data && cmds_sent) {
 682                 if (pack_objects(out, remote_refs, extra_have, &commons, args) < 0) {
 683                         if (args->stateless_rpc)
 684                                 close(out);
 685                         if (git_connection_is_socket(conn))
 686                                 shutdown(fd[0], SHUT_WR);
 687
 688                         /*
 689                          * Do not even bother with the return value; we know we
 690                          * are failing, and just want the error() side effects,
 691                          * as well as marking refs with their remote status (if
 692                          * we get one).
 693                          */
 694                         if (status_report)
 695                                 receive_status(&reader, remote_refs);
 696
 697                         if (use_sideband) {
 698                                 close(demux.out);
 699                                 finish_async(&demux);
 700                         }
 701                         fd[1] = -1;
 702                         return -1;
 703                 }
 704                 if (!args->stateless_rpc)
 705                         /* Closed by pack_objects() via start_command() */
 706                         fd[1] = -1;
 707         }
 708         if (args->stateless_rpc && cmds_sent)
 709                 packet_flush(out);
 710
 711         if (status_report && cmds_sent)
 712                 ret = receive_status(&reader, remote_refs);
 713         else
 714                 ret = 0;
 715         if (args->stateless_rpc)
 716                 packet_flush(out);
 717
 718         if (use_sideband && cmds_sent) {
 719                 close(demux.out);
 720                 if (finish_async(&demux)) {
 721                         error("error in sideband demultiplexer");
 722                         ret = -1;
 723                 }
 724         }
 725
 726         if (ret < 0)
 727                 return ret;
 728
 729         if (args->porcelain)
 730                 return 0;
 731
 732         for (ref = remote_refs; ref; ref = ref->next) {
 733                 switch (ref->status) {
 734                 case REF_STATUS_NONE:
 735                 case REF_STATUS_UPTODATE:
 736                 case REF_STATUS_OK:
 737                         break;
 738                 default:
 739                         return -1;
 740                 }
 741         }
 742         return 0;
 743 }