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         if (args->disable_bitmaps)
  88                 strvec_push(&po.args, "--no-use-bitmap-index");
  89         po.in = -1;
  90         po.out = args->stateless_rpc ? -1 : fd;
  91         po.git_cmd = 1;
  92         po.clean_on_exit = 1;
  93         if (start_command(&po))
  94                 die_errno("git pack-objects failed");
  95
  96         /*
  97          * We feed the pack-objects we just spawned with revision
  98          * parameters by writing to the pipe.
  99          */
 100         po_in = xfdopen(po.in, "w");
 101         for (i = 0; i < advertised->nr; i++)
 102                 feed_object(&advertised->oid[i], po_in, 1);
 103         for (i = 0; i < negotiated->nr; i++)
 104                 feed_object(&negotiated->oid[i], po_in, 1);
 105
 106         while (refs) {
 107                 if (!is_null_oid(&refs->old_oid))
 108                         feed_object(&refs->old_oid, po_in, 1);
 109                 if (!is_null_oid(&refs->new_oid))
 110                         feed_object(&refs->new_oid, po_in, 0);
 111                 refs = refs->next;
 112         }
 113
 114         fflush(po_in);
 115         if (ferror(po_in))
 116                 die_errno("error writing to pack-objects");
 117         fclose(po_in);
 118
 119         if (args->stateless_rpc) {
 120                 char *buf = xmalloc(LARGE_PACKET_MAX);
 121                 while (1) {
 122                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
 123                         if (n <= 0)
 124                                 break;
 125                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
 126                 }
 127                 free(buf);
 128                 close(po.out);
 129                 po.out = -1;
 130         }
 131
 132         rc = finish_command(&po);
 133         if (rc) {
 134                 /*
 135                  * For a normal non-zero exit, we assume pack-objects wrote
 136                  * something useful to stderr. For death by signal, though,
 137                  * we should mention it to the user. The exception is SIGPIPE
 138                  * (141), because that's a normal occurrence if the remote end
 139                  * hangs up (and we'll report that by trying to read the unpack
 140                  * status).
 141                  */
 142                 if (rc > 128 && rc != 141)
 143                         error("pack-objects died of signal %d", rc - 128);
 144                 return -1;
 145         }
 146         return 0;
 147 }
 148
 149 static int receive_unpack_status(struct packet_reader *reader)
 150 {
 151         if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 152                 return error(_("unexpected flush packet while reading remote unpack status"));
 153         if (!skip_prefix(reader->line, "unpack ", &reader->line))
 154                 return error(_("unable to parse remote unpack status: %s"), reader->line);
 155         if (strcmp(reader->line, "ok"))
 156                 return error(_("remote unpack failed: %s"), reader->line);
 157         return 0;
 158 }
 159
 160 static int receive_status(struct packet_reader *reader, struct ref *refs)
 161 {
 162         struct ref *hint;
 163         int ret;
 164         struct ref_push_report *report = NULL;
 165         int new_report = 0;
 166         int once = 0;
 167
 168         hint = NULL;
 169         ret = receive_unpack_status(reader);
 170         while (1) {
 171                 struct object_id old_oid, new_oid;
 172                 const char *head;
 173                 const char *refname;
 174                 char *p;
 175                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 176                         break;
 177                 head = reader->line;
 178                 p = strchr(head, ' ');
 179                 if (!p) {
 180                         error("invalid status line from remote: %s", reader->line);
 181                         ret = -1;
 182                         break;
 183                 }
 184                 *p++ = '\0';
 185
 186                 if (!strcmp(head, "option")) {
 187                         const char *key, *val;
 188
 189                         if (!hint || !(report || new_report)) {
 190                                 if (!once++)
 191                                         error("'option' without a matching 'ok/ng' directive");
 192                                 ret = -1;
 193                                 continue;
 194                         }
 195                         if (new_report) {
 196                                 if (!hint->report) {
 197                                         CALLOC_ARRAY(hint->report, 1);
 198                                         report = hint->report;
 199                                 } else {
 200                                         report = hint->report;
 201                                         while (report->next)
 202                                                 report = report->next;
 203                                         CALLOC_ARRAY(report->next, 1);
 204                                         report = report->next;
 205                                 }
 206                                 new_report = 0;
 207                         }
 208                         key = p;
 209                         p = strchr(key, ' ');
 210                         if (p)
 211                                 *p++ = '\0';
 212                         val = p;
 213                         if (!strcmp(key, "refname"))
 214                                 report->ref_name = xstrdup_or_null(val);
 215                         else if (!strcmp(key, "old-oid") && val &&
 216                                  !parse_oid_hex(val, &old_oid, &val))
 217                                 report->old_oid = oiddup(&old_oid);
 218                         else if (!strcmp(key, "new-oid") && val &&
 219                                  !parse_oid_hex(val, &new_oid, &val))
 220                                 report->new_oid = oiddup(&new_oid);
 221                         else if (!strcmp(key, "forced-update"))
 222                                 report->forced_update = 1;
 223                         continue;
 224                 }
 225
 226                 report = NULL;
 227                 new_report = 0;
 228                 if (strcmp(head, "ok") && strcmp(head, "ng")) {
 229                         error("invalid ref status from remote: %s", head);
 230                         ret = -1;
 231                         break;
 232                 }
 233                 refname = p;
 234                 p = strchr(refname, ' ');
 235                 if (p)
 236                         *p++ = '\0';
 237                 /* first try searching at our hint, falling back to all refs */
 238                 if (hint)
 239                         hint = find_ref_by_name(hint, refname);
 240                 if (!hint)
 241                         hint = find_ref_by_name(refs, refname);
 242                 if (!hint) {
 243                         warning("remote reported status on unknown ref: %s",
 244                                 refname);
 245                         continue;
 246                 }
 247                 if (hint->status != REF_STATUS_EXPECTING_REPORT &&
 248                     hint->status != REF_STATUS_OK &&
 249                     hint->status != REF_STATUS_REMOTE_REJECT) {
 250                         warning("remote reported status on unexpected ref: %s",
 251                                 refname);
 252                         continue;
 253                 }
 254                 if (!strcmp(head, "ng")) {
 255                         hint->status = REF_STATUS_REMOTE_REJECT;
 256                         if (p)
 257                                 hint->remote_status = xstrdup(p);
 258                         else
 259                                 hint->remote_status = "failed";
 260                 } else {
 261                         hint->status = REF_STATUS_OK;
 262                         hint->remote_status = xstrdup_or_null(p);
 263                         new_report = 1;
 264                 }
 265         }
 266         return ret;
 267 }
 268
 269 static int sideband_demux(int UNUSED(in), int out, void *data)
 270 {
 271         int *fd = data, ret;
 272         if (async_with_fork())
 273                 close(fd[1]);
 274         ret = recv_sideband("send-pack", fd[0], out);
 275         close(out);
 276         return ret;
 277 }
 278
 279 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 280 {
 281         struct strbuf *sb = cb;
 282         if (graft->nr_parent == -1)
 283                 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
 284         return 0;
 285 }
 286
 287 static void advertise_shallow_grafts_buf(struct strbuf *sb)
 288 {
 289         if (!is_repository_shallow(the_repository))
 290                 return;
 291         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 292 }
 293
 294 #define CHECK_REF_NO_PUSH -1
 295 #define CHECK_REF_STATUS_REJECTED -2
 296 #define CHECK_REF_UPTODATE -3
 297 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
 298 {
 299         if (!ref->peer_ref && !args->send_mirror)
 300                 return CHECK_REF_NO_PUSH;
 301
 302         /* Check for statuses set by set_ref_status_for_push() */
 303         switch (ref->status) {
 304         case REF_STATUS_REJECT_NONFASTFORWARD:
 305         case REF_STATUS_REJECT_ALREADY_EXISTS:
 306         case REF_STATUS_REJECT_FETCH_FIRST:
 307         case REF_STATUS_REJECT_NEEDS_FORCE:
 308         case REF_STATUS_REJECT_STALE:
 309         case REF_STATUS_REJECT_REMOTE_UPDATED:
 310         case REF_STATUS_REJECT_NODELETE:
 311                 return CHECK_REF_STATUS_REJECTED;
 312         case REF_STATUS_UPTODATE:
 313                 return CHECK_REF_UPTODATE;
 314
 315         default:
 316         case REF_STATUS_EXPECTING_REPORT:
 317                 /* already passed checks on the local side */
 318         case REF_STATUS_OK:
 319                 /* of course this is OK */
 320                 return 0;
 321         }
 322 }
 323
 324 /*
 325  * the beginning of the next line, or the end of buffer.
 326  *
 327  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 328  * convert many similar uses found by "git grep -A4 memchr".
 329  */
 330 static const char *next_line(const char *line, size_t len)
 331 {
 332         const char *nl = memchr(line, '\n', len);
 333         if (!nl)
 334                 return line + len; /* incomplete line */
 335         return nl + 1;
 336 }
 337
 338 static int generate_push_cert(struct strbuf *req_buf,
 339                               const struct ref *remote_refs,
 340                               struct send_pack_args *args,
 341                               const char *cap_string,
 342                               const char *push_cert_nonce)
 343 {
 344         const struct ref *ref;
 345         struct string_list_item *item;
 346         char *signing_key_id = xstrdup(get_signing_key_id());
 347         const char *cp, *np;
 348         struct strbuf cert = STRBUF_INIT;
 349         int update_seen = 0;
 350
 351         strbuf_addstr(&cert, "certificate version 0.1\n");
 352         strbuf_addf(&cert, "pusher %s ", signing_key_id);
 353         datestamp(&cert);
 354         strbuf_addch(&cert, '\n');
 355         if (args->url && *args->url) {
 356                 char *anon_url = transport_anonymize_url(args->url);
 357                 strbuf_addf(&cert, "pushee %s\n", anon_url);
 358                 free(anon_url);
 359         }
 360         if (push_cert_nonce[0])
 361                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
 362         if (args->push_options)
 363                 for_each_string_list_item(item, args->push_options)
 364                         strbuf_addf(&cert, "push-option %s\n", item->string);
 365         strbuf_addstr(&cert, "\n");
 366
 367         for (ref = remote_refs; ref; ref = ref->next) {
 368                 if (check_to_send_update(ref, args) < 0)
 369                         continue;
 370                 update_seen = 1;
 371                 strbuf_addf(&cert, "%s %s %s\n",
 372                             oid_to_hex(&ref->old_oid),
 373                             oid_to_hex(&ref->new_oid),
 374                             ref->name);
 375         }
 376         if (!update_seen)
 377                 goto free_return;
 378
 379         if (sign_buffer(&cert, &cert, get_signing_key()))
 380                 die(_("failed to sign the push certificate"));
 381
 382         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 383         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 384                 np = next_line(cp, cert.buf + cert.len - cp);
 385                 packet_buf_write(req_buf,
 386                                  "%.*s", (int)(np - cp), cp);
 387         }
 388         packet_buf_write(req_buf, "push-cert-end\n");
 389
 390 free_return:
 391         free(signing_key_id);
 392         strbuf_release(&cert);
 393         return update_seen;
 394 }
 395
 396 #define NONCE_LEN_LIMIT 256
 397
 398 static void reject_invalid_nonce(const char *nonce, int len)
 399 {
 400         int i = 0;
 401
 402         if (NONCE_LEN_LIMIT <= len)
 403                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 404                     len, nonce);
 405
 406         for (i = 0; i < len; i++) {
 407                 int ch = nonce[i] & 0xFF;
 408                 if (isalnum(ch) ||
 409                     ch == '-' || ch == '.' ||
 410                     ch == '/' || ch == '+' ||
 411                     ch == '=' || ch == '_')
 412                         continue;
 413                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 414                     len, nonce);
 415         }
 416 }
 417
 418 static void get_commons_through_negotiation(const char *url,
 419                                             const struct ref *remote_refs,
 420                                             struct oid_array *commons)
 421 {
 422         struct child_process child = CHILD_PROCESS_INIT;
 423         const struct ref *ref;
 424         int len = the_hash_algo->hexsz + 1; /* hash + NL */
 425
 426         child.git_cmd = 1;
 427         child.no_stdin = 1;
 428         child.out = -1;
 429         strvec_pushl(&child.args, "fetch", "--negotiate-only", NULL);
 430         for (ref = remote_refs; ref; ref = ref->next) {
 431                 if (!is_null_oid(&ref->new_oid))
 432                         strvec_pushf(&child.args, "--negotiation-tip=%s", oid_to_hex(&ref->new_oid));
 433         }
 434         strvec_push(&child.args, url);
 435
 436         if (start_command(&child))
 437                 die(_("send-pack: unable to fork off fetch subprocess"));
 438
 439         do {
 440                 char hex_hash[GIT_MAX_HEXSZ + 1];
 441                 int read_len = read_in_full(child.out, hex_hash, len);
 442                 struct object_id oid;
 443                 const char *end;
 444
 445                 if (!read_len)
 446                         break;
 447                 if (read_len != len)
 448                         die("invalid length read %d", read_len);
 449                 if (parse_oid_hex(hex_hash, &oid, &end) || *end != '\n')
 450                         die("invalid hash");
 451                 oid_array_append(commons, &oid);
 452         } while (1);
 453
 454         if (finish_command(&child)) {
 455                 /*
 456                  * The information that push negotiation provides is useful but
 457                  * not mandatory.
 458                  */
 459                 warning(_("push negotiation failed; proceeding anyway with push"));
 460         }
 461 }
 462
 463 int send_pack(struct send_pack_args *args,
 464               int fd[], struct child_process *conn,
 465               struct ref *remote_refs,
 466               struct oid_array *extra_have)
 467 {
 468         struct oid_array commons = OID_ARRAY_INIT;
 469         int in = fd[0];
 470         int out = fd[1];
 471         struct strbuf req_buf = STRBUF_INIT;
 472         struct strbuf cap_buf = STRBUF_INIT;
 473         struct ref *ref;
 474         int need_pack_data = 0;
 475         int allow_deleting_refs = 0;
 476         int status_report = 0;
 477         int use_sideband = 0;
 478         int quiet_supported = 0;
 479         int agent_supported = 0;
 480         int advertise_sid = 0;
 481         int push_negotiate = 0;
 482         int use_atomic = 0;
 483         int atomic_supported = 0;
 484         int use_push_options = 0;
 485         int push_options_supported = 0;
 486         int object_format_supported = 0;
 487         unsigned cmds_sent = 0;
 488         int ret;
 489         struct async demux;
 490         const char *push_cert_nonce = NULL;
 491         struct packet_reader reader;
 492         int use_bitmaps;
 493
 494         if (!remote_refs) {
 495                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 496                         "Perhaps you should specify a branch.\n");
 497                 return 0;
 498         }
 499
 500         git_config_get_bool("push.negotiate", &push_negotiate);
 501         if (push_negotiate)
 502                 get_commons_through_negotiation(args->url, remote_refs, &commons);
 503
 504         if (!git_config_get_bool("push.usebitmaps", &use_bitmaps))
 505                 args->disable_bitmaps = !use_bitmaps;
 506
 507         git_config_get_bool("transfer.advertisesid", &advertise_sid);
 508
 509         /* Does the other end support the reporting? */
 510         if (server_supports("report-status-v2"))
 511                 status_report = 2;
 512         else if (server_supports("report-status"))
 513                 status_report = 1;
 514         if (server_supports("delete-refs"))
 515                 allow_deleting_refs = 1;
 516         if (server_supports("ofs-delta"))
 517                 args->use_ofs_delta = 1;
 518         if (server_supports("side-band-64k"))
 519                 use_sideband = 1;
 520         if (server_supports("quiet"))
 521                 quiet_supported = 1;
 522         if (server_supports("agent"))
 523                 agent_supported = 1;
 524         if (!server_supports("session-id"))
 525                 advertise_sid = 0;
 526         if (server_supports("no-thin"))
 527                 args->use_thin_pack = 0;
 528         if (server_supports("atomic"))
 529                 atomic_supported = 1;
 530         if (server_supports("push-options"))
 531                 push_options_supported = 1;
 532
 533         if (!server_supports_hash(the_hash_algo->name, &object_format_supported))
 534                 die(_("the receiving end does not support this repository's hash algorithm"));
 535
 536         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
 537                 int len;
 538                 push_cert_nonce = server_feature_value("push-cert", &len);
 539                 if (push_cert_nonce) {
 540                         reject_invalid_nonce(push_cert_nonce, len);
 541                         push_cert_nonce = xmemdupz(push_cert_nonce, len);
 542                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
 543                         die(_("the receiving end does not support --signed push"));
 544                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
 545                         warning(_("not sending a push certificate since the"
 546                                   " receiving end does not support --signed"
 547                                   " push"));
 548                 }
 549         }
 550
 551         if (args->atomic && !atomic_supported)
 552                 die(_("the receiving end does not support --atomic push"));
 553
 554         use_atomic = atomic_supported && args->atomic;
 555
 556         if (args->push_options && !push_options_supported)
 557                 die(_("the receiving end does not support push options"));
 558
 559         use_push_options = push_options_supported && args->push_options;
 560
 561         if (status_report == 1)
 562                 strbuf_addstr(&cap_buf, " report-status");
 563         else if (status_report == 2)
 564                 strbuf_addstr(&cap_buf, " report-status-v2");
 565         if (use_sideband)
 566                 strbuf_addstr(&cap_buf, " side-band-64k");
 567         if (quiet_supported && (args->quiet || !args->progress))
 568                 strbuf_addstr(&cap_buf, " quiet");
 569         if (use_atomic)
 570                 strbuf_addstr(&cap_buf, " atomic");
 571         if (use_push_options)
 572                 strbuf_addstr(&cap_buf, " push-options");
 573         if (object_format_supported)
 574                 strbuf_addf(&cap_buf, " object-format=%s", the_hash_algo->name);
 575         if (agent_supported)
 576                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 577         if (advertise_sid)
 578                 strbuf_addf(&cap_buf, " session-id=%s", trace2_session_id());
 579
 580         /*
 581          * NEEDSWORK: why does delete-refs have to be so specific to
 582          * send-pack machinery that set_ref_status_for_push() cannot
 583          * set this bit for us???
 584          */
 585         for (ref = remote_refs; ref; ref = ref->next)
 586                 if (ref->deletion && !allow_deleting_refs)
 587                         ref->status = REF_STATUS_REJECT_NODELETE;
 588
 589         /*
 590          * Clear the status for each ref and see if we need to send
 591          * the pack data.
 592          */
 593         for (ref = remote_refs; ref; ref = ref->next) {
 594                 switch (check_to_send_update(ref, args)) {
 595                 case 0: /* no error */
 596                         break;
 597                 case CHECK_REF_STATUS_REJECTED:
 598                         /*
 599                          * When we know the server would reject a ref update if
 600                          * we were to send it and we're trying to send the refs
 601                          * atomically, abort the whole operation.
 602                          */
 603                         if (use_atomic) {
 604                                 strbuf_release(&req_buf);
 605                                 strbuf_release(&cap_buf);
 606                                 reject_atomic_push(remote_refs, args->send_mirror);
 607                                 error("atomic push failed for ref %s. status: %d\n",
 608                                       ref->name, ref->status);
 609                                 return args->porcelain ? 0 : -1;
 610                         }
 611                         /* else fallthrough */
 612                 default:
 613                         continue;
 614                 }
 615                 if (!ref->deletion)
 616                         need_pack_data = 1;
 617
 618                 if (args->dry_run || !status_report)
 619                         ref->status = REF_STATUS_OK;
 620                 else
 621                         ref->status = REF_STATUS_EXPECTING_REPORT;
 622         }
 623
 624         if (!args->dry_run)
 625                 advertise_shallow_grafts_buf(&req_buf);
 626
 627         /*
 628          * Finally, tell the other end!
 629          */
 630         if (!args->dry_run && push_cert_nonce)
 631                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 632                                                cap_buf.buf, push_cert_nonce);
 633         else if (!args->dry_run)
 634                 for (ref = remote_refs; ref; ref = ref->next) {
 635                         char *old_hex, *new_hex;
 636
 637                         if (check_to_send_update(ref, args) < 0)
 638                                 continue;
 639
 640                         old_hex = oid_to_hex(&ref->old_oid);
 641                         new_hex = oid_to_hex(&ref->new_oid);
 642                         if (!cmds_sent) {
 643                                 packet_buf_write(&req_buf,
 644                                                  "%s %s %s%c%s",
 645                                                  old_hex, new_hex, ref->name, 0,
 646                                                  cap_buf.buf);
 647                                 cmds_sent = 1;
 648                         } else {
 649                                 packet_buf_write(&req_buf, "%s %s %s",
 650                                                  old_hex, new_hex, ref->name);
 651                         }
 652                 }
 653
 654         if (use_push_options) {
 655                 struct string_list_item *item;
 656
 657                 packet_buf_flush(&req_buf);
 658                 for_each_string_list_item(item, args->push_options)
 659                         packet_buf_write(&req_buf, "%s", item->string);
 660         }
 661
 662         if (args->stateless_rpc) {
 663                 if (!args->dry_run && (cmds_sent || is_repository_shallow(the_repository))) {
 664                         packet_buf_flush(&req_buf);
 665                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 666                 }
 667         } else {
 668                 write_or_die(out, req_buf.buf, req_buf.len);
 669                 packet_flush(out);
 670         }
 671         strbuf_release(&req_buf);
 672         strbuf_release(&cap_buf);
 673
 674         if (use_sideband && cmds_sent) {
 675                 memset(&demux, 0, sizeof(demux));
 676                 demux.proc = sideband_demux;
 677                 demux.data = fd;
 678                 demux.out = -1;
 679                 demux.isolate_sigpipe = 1;
 680                 if (start_async(&demux))
 681                         die("send-pack: unable to fork off sideband demultiplexer");
 682                 in = demux.out;
 683         }
 684
 685         packet_reader_init(&reader, in, NULL, 0,
 686                            PACKET_READ_CHOMP_NEWLINE |
 687                            PACKET_READ_DIE_ON_ERR_PACKET);
 688
 689         if (need_pack_data && cmds_sent) {
 690                 if (pack_objects(out, remote_refs, extra_have, &commons, args) < 0) {
 691                         if (args->stateless_rpc)
 692                                 close(out);
 693                         if (git_connection_is_socket(conn))
 694                                 shutdown(fd[0], SHUT_WR);
 695
 696                         /*
 697                          * Do not even bother with the return value; we know we
 698                          * are failing, and just want the error() side effects,
 699                          * as well as marking refs with their remote status (if
 700                          * we get one).
 701                          */
 702                         if (status_report)
 703                                 receive_status(&reader, remote_refs);
 704
 705                         if (use_sideband) {
 706                                 close(demux.out);
 707                                 finish_async(&demux);
 708                         }
 709                         fd[1] = -1;
 710                         return -1;
 711                 }
 712                 if (!args->stateless_rpc)
 713                         /* Closed by pack_objects() via start_command() */
 714                         fd[1] = -1;
 715         }
 716         if (args->stateless_rpc && cmds_sent)
 717                 packet_flush(out);
 718
 719         if (status_report && cmds_sent)
 720                 ret = receive_status(&reader, remote_refs);
 721         else
 722                 ret = 0;
 723         if (args->stateless_rpc)
 724                 packet_flush(out);
 725
 726         if (use_sideband && cmds_sent) {
 727                 close(demux.out);
 728                 if (finish_async(&demux)) {
 729                         error("error in sideband demultiplexer");
 730                         ret = -1;
 731                 }
 732         }
 733
 734         if (ret < 0)
 735                 return ret;
 736
 737         if (args->porcelain)
 738                 return 0;
 739
 740         for (ref = remote_refs; ref; ref = ref->next) {
 741                 switch (ref->status) {
 742                 case REF_STATUS_NONE:
 743                 case REF_STATUS_UPTODATE:
 744                 case REF_STATUS_OK:
 745                         break;
 746                 default:
 747                         return -1;
 748                 }
 749         }
 750         return 0;
 751 }