send-pack.c

   1 #include "git-compat-util.h"
   2 #include "config.h"
   3 #include "commit.h"
   4 #include "hex.h"
   5 #include "refs.h"
   6 #include "object-store.h"
   7 #include "pkt-line.h"
   8 #include "sideband.h"
   9 #include "run-command.h"
  10 #include "remote.h"
  11 #include "connect.h"
  12 #include "send-pack.h"
  13 #include "quote.h"
  14 #include "transport.h"
  15 #include "version.h"
  16 #include "oid-array.h"
  17 #include "gpg-interface.h"
  18 #include "cache.h"
  19 #include "shallow.h"
  20 #include "parse-options.h"
  21
  22 int option_parse_push_signed(const struct option *opt,
  23                              const char *arg, int unset)
  24 {
  25         if (unset) {
  26                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
  27                 return 0;
  28         }
  29         switch (git_parse_maybe_bool(arg)) {
  30         case 1:
  31                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
  32                 return 0;
  33         case 0:
  34                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
  35                 return 0;
  36         }
  37         if (!strcasecmp("if-asked", arg)) {
  38                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
  39                 return 0;
  40         }
  41         die("bad %s argument: %s", opt->long_name, arg);
  42 }
  43
  44 static void feed_object(const struct object_id *oid, FILE *fh, int negative)
  45 {
  46         if (negative &&
  47             !has_object_file_with_flags(oid,
  48                                         OBJECT_INFO_SKIP_FETCH_OBJECT |
  49                                         OBJECT_INFO_QUICK))
  50                 return;
  51
  52         if (negative)
  53                 putc('^', fh);
  54         fputs(oid_to_hex(oid), fh);
  55         putc('\n', fh);
  56 }
  57
  58 /*
  59  * Make a pack stream and spit it out into file descriptor fd
  60  */
  61 static int pack_objects(int fd, struct ref *refs, struct oid_array *advertised,
  62                         struct oid_array *negotiated,
  63                         struct send_pack_args *args)
  64 {
  65         /*
  66          * The child becomes pack-objects --revs; we feed
  67          * the revision parameters to it via its stdin and
  68          * let its stdout go back to the other end.
  69          */
  70         struct child_process po = CHILD_PROCESS_INIT;
  71         FILE *po_in;
  72         int i;
  73         int rc;
  74
  75         strvec_push(&po.args, "pack-objects");
  76         strvec_push(&po.args, "--all-progress-implied");
  77         strvec_push(&po.args, "--revs");
  78         strvec_push(&po.args, "--stdout");
  79         if (args->use_thin_pack)
  80                 strvec_push(&po.args, "--thin");
  81         if (args->use_ofs_delta)
  82                 strvec_push(&po.args, "--delta-base-offset");
  83         if (args->quiet || !args->progress)
  84                 strvec_push(&po.args, "-q");
  85         if (args->progress)
  86                 strvec_push(&po.args, "--progress");
  87         if (is_repository_shallow(the_repository))
  88                 strvec_push(&po.args, "--shallow");
  89         if (args->disable_bitmaps)
  90                 strvec_push(&po.args, "--no-use-bitmap-index");
  91         po.in = -1;
  92         po.out = args->stateless_rpc ? -1 : fd;
  93         po.git_cmd = 1;
  94         po.clean_on_exit = 1;
  95         if (start_command(&po))
  96                 die_errno("git pack-objects failed");
  97
  98         /*
  99          * We feed the pack-objects we just spawned with revision
 100          * parameters by writing to the pipe.
 101          */
 102         po_in = xfdopen(po.in, "w");
 103         for (i = 0; i < advertised->nr; i++)
 104                 feed_object(&advertised->oid[i], po_in, 1);
 105         for (i = 0; i < negotiated->nr; i++)
 106                 feed_object(&negotiated->oid[i], po_in, 1);
 107
 108         while (refs) {
 109                 if (!is_null_oid(&refs->old_oid))
 110                         feed_object(&refs->old_oid, po_in, 1);
 111                 if (!is_null_oid(&refs->new_oid))
 112                         feed_object(&refs->new_oid, po_in, 0);
 113                 refs = refs->next;
 114         }
 115
 116         fflush(po_in);
 117         if (ferror(po_in))
 118                 die_errno("error writing to pack-objects");
 119         fclose(po_in);
 120
 121         if (args->stateless_rpc) {
 122                 char *buf = xmalloc(LARGE_PACKET_MAX);
 123                 while (1) {
 124                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
 125                         if (n <= 0)
 126                                 break;
 127                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
 128                 }
 129                 free(buf);
 130                 close(po.out);
 131                 po.out = -1;
 132         }
 133
 134         rc = finish_command(&po);
 135         if (rc) {
 136                 /*
 137                  * For a normal non-zero exit, we assume pack-objects wrote
 138                  * something useful to stderr. For death by signal, though,
 139                  * we should mention it to the user. The exception is SIGPIPE
 140                  * (141), because that's a normal occurrence if the remote end
 141                  * hangs up (and we'll report that by trying to read the unpack
 142                  * status).
 143                  */
 144                 if (rc > 128 && rc != 141)
 145                         error("pack-objects died of signal %d", rc - 128);
 146                 return -1;
 147         }
 148         return 0;
 149 }
 150
 151 static int receive_unpack_status(struct packet_reader *reader)
 152 {
 153         if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 154                 return error(_("unexpected flush packet while reading remote unpack status"));
 155         if (!skip_prefix(reader->line, "unpack ", &reader->line))
 156                 return error(_("unable to parse remote unpack status: %s"), reader->line);
 157         if (strcmp(reader->line, "ok"))
 158                 return error(_("remote unpack failed: %s"), reader->line);
 159         return 0;
 160 }
 161
 162 static int receive_status(struct packet_reader *reader, struct ref *refs)
 163 {
 164         struct ref *hint;
 165         int ret;
 166         struct ref_push_report *report = NULL;
 167         int new_report = 0;
 168         int once = 0;
 169
 170         hint = NULL;
 171         ret = receive_unpack_status(reader);
 172         while (1) {
 173                 struct object_id old_oid, new_oid;
 174                 const char *head;
 175                 const char *refname;
 176                 char *p;
 177                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 178                         break;
 179                 head = reader->line;
 180                 p = strchr(head, ' ');
 181                 if (!p) {
 182                         error("invalid status line from remote: %s", reader->line);
 183                         ret = -1;
 184                         break;
 185                 }
 186                 *p++ = '\0';
 187
 188                 if (!strcmp(head, "option")) {
 189                         const char *key, *val;
 190
 191                         if (!hint || !(report || new_report)) {
 192                                 if (!once++)
 193                                         error("'option' without a matching 'ok/ng' directive");
 194                                 ret = -1;
 195                                 continue;
 196                         }
 197                         if (new_report) {
 198                                 if (!hint->report) {
 199                                         CALLOC_ARRAY(hint->report, 1);
 200                                         report = hint->report;
 201                                 } else {
 202                                         report = hint->report;
 203                                         while (report->next)
 204                                                 report = report->next;
 205                                         CALLOC_ARRAY(report->next, 1);
 206                                         report = report->next;
 207                                 }
 208                                 new_report = 0;
 209                         }
 210                         key = p;
 211                         p = strchr(key, ' ');
 212                         if (p)
 213                                 *p++ = '\0';
 214                         val = p;
 215                         if (!strcmp(key, "refname"))
 216                                 report->ref_name = xstrdup_or_null(val);
 217                         else if (!strcmp(key, "old-oid") && val &&
 218                                  !parse_oid_hex(val, &old_oid, &val))
 219                                 report->old_oid = oiddup(&old_oid);
 220                         else if (!strcmp(key, "new-oid") && val &&
 221                                  !parse_oid_hex(val, &new_oid, &val))
 222                                 report->new_oid = oiddup(&new_oid);
 223                         else if (!strcmp(key, "forced-update"))
 224                                 report->forced_update = 1;
 225                         continue;
 226                 }
 227
 228                 report = NULL;
 229                 new_report = 0;
 230                 if (strcmp(head, "ok") && strcmp(head, "ng")) {
 231                         error("invalid ref status from remote: %s", head);
 232                         ret = -1;
 233                         break;
 234                 }
 235                 refname = p;
 236                 p = strchr(refname, ' ');
 237                 if (p)
 238                         *p++ = '\0';
 239                 /* first try searching at our hint, falling back to all refs */
 240                 if (hint)
 241                         hint = find_ref_by_name(hint, refname);
 242                 if (!hint)
 243                         hint = find_ref_by_name(refs, refname);
 244                 if (!hint) {
 245                         warning("remote reported status on unknown ref: %s",
 246                                 refname);
 247                         continue;
 248                 }
 249                 if (hint->status != REF_STATUS_EXPECTING_REPORT &&
 250                     hint->status != REF_STATUS_OK &&
 251                     hint->status != REF_STATUS_REMOTE_REJECT) {
 252                         warning("remote reported status on unexpected ref: %s",
 253                                 refname);
 254                         continue;
 255                 }
 256                 if (!strcmp(head, "ng")) {
 257                         hint->status = REF_STATUS_REMOTE_REJECT;
 258                         if (p)
 259                                 hint->remote_status = xstrdup(p);
 260                         else
 261                                 hint->remote_status = "failed";
 262                 } else {
 263                         hint->status = REF_STATUS_OK;
 264                         hint->remote_status = xstrdup_or_null(p);
 265                         new_report = 1;
 266                 }
 267         }
 268         return ret;
 269 }
 270
 271 static int sideband_demux(int in UNUSED, int out, void *data)
 272 {
 273         int *fd = data, ret;
 274         if (async_with_fork())
 275                 close(fd[1]);
 276         ret = recv_sideband("send-pack", fd[0], out);
 277         close(out);
 278         return ret;
 279 }
 280
 281 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 282 {
 283         struct strbuf *sb = cb;
 284         if (graft->nr_parent == -1)
 285                 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
 286         return 0;
 287 }
 288
 289 static void advertise_shallow_grafts_buf(struct strbuf *sb)
 290 {
 291         if (!is_repository_shallow(the_repository))
 292                 return;
 293         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 294 }
 295
 296 #define CHECK_REF_NO_PUSH -1
 297 #define CHECK_REF_STATUS_REJECTED -2
 298 #define CHECK_REF_UPTODATE -3
 299 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
 300 {
 301         if (!ref->peer_ref && !args->send_mirror)
 302                 return CHECK_REF_NO_PUSH;
 303
 304         /* Check for statuses set by set_ref_status_for_push() */
 305         switch (ref->status) {
 306         case REF_STATUS_REJECT_NONFASTFORWARD:
 307         case REF_STATUS_REJECT_ALREADY_EXISTS:
 308         case REF_STATUS_REJECT_FETCH_FIRST:
 309         case REF_STATUS_REJECT_NEEDS_FORCE:
 310         case REF_STATUS_REJECT_STALE:
 311         case REF_STATUS_REJECT_REMOTE_UPDATED:
 312         case REF_STATUS_REJECT_NODELETE:
 313                 return CHECK_REF_STATUS_REJECTED;
 314         case REF_STATUS_UPTODATE:
 315                 return CHECK_REF_UPTODATE;
 316
 317         default:
 318         case REF_STATUS_EXPECTING_REPORT:
 319                 /* already passed checks on the local side */
 320         case REF_STATUS_OK:
 321                 /* of course this is OK */
 322                 return 0;
 323         }
 324 }
 325
 326 /*
 327  * the beginning of the next line, or the end of buffer.
 328  *
 329  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 330  * convert many similar uses found by "git grep -A4 memchr".
 331  */
 332 static const char *next_line(const char *line, size_t len)
 333 {
 334         const char *nl = memchr(line, '\n', len);
 335         if (!nl)
 336                 return line + len; /* incomplete line */
 337         return nl + 1;
 338 }
 339
 340 static int generate_push_cert(struct strbuf *req_buf,
 341                               const struct ref *remote_refs,
 342                               struct send_pack_args *args,
 343                               const char *cap_string,
 344                               const char *push_cert_nonce)
 345 {
 346         const struct ref *ref;
 347         struct string_list_item *item;
 348         char *signing_key_id = xstrdup(get_signing_key_id());
 349         const char *cp, *np;
 350         struct strbuf cert = STRBUF_INIT;
 351         int update_seen = 0;
 352
 353         strbuf_addstr(&cert, "certificate version 0.1\n");
 354         strbuf_addf(&cert, "pusher %s ", signing_key_id);
 355         datestamp(&cert);
 356         strbuf_addch(&cert, '\n');
 357         if (args->url && *args->url) {
 358                 char *anon_url = transport_anonymize_url(args->url);
 359                 strbuf_addf(&cert, "pushee %s\n", anon_url);
 360                 free(anon_url);
 361         }
 362         if (push_cert_nonce[0])
 363                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
 364         if (args->push_options)
 365                 for_each_string_list_item(item, args->push_options)
 366                         strbuf_addf(&cert, "push-option %s\n", item->string);
 367         strbuf_addstr(&cert, "\n");
 368
 369         for (ref = remote_refs; ref; ref = ref->next) {
 370                 if (check_to_send_update(ref, args) < 0)
 371                         continue;
 372                 update_seen = 1;
 373                 strbuf_addf(&cert, "%s %s %s\n",
 374                             oid_to_hex(&ref->old_oid),
 375                             oid_to_hex(&ref->new_oid),
 376                             ref->name);
 377         }
 378         if (!update_seen)
 379                 goto free_return;
 380
 381         if (sign_buffer(&cert, &cert, get_signing_key()))
 382                 die(_("failed to sign the push certificate"));
 383
 384         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 385         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 386                 np = next_line(cp, cert.buf + cert.len - cp);
 387                 packet_buf_write(req_buf,
 388                                  "%.*s", (int)(np - cp), cp);
 389         }
 390         packet_buf_write(req_buf, "push-cert-end\n");
 391
 392 free_return:
 393         free(signing_key_id);
 394         strbuf_release(&cert);
 395         return update_seen;
 396 }
 397
 398 #define NONCE_LEN_LIMIT 256
 399
 400 static void reject_invalid_nonce(const char *nonce, int len)
 401 {
 402         int i = 0;
 403
 404         if (NONCE_LEN_LIMIT <= len)
 405                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 406                     len, nonce);
 407
 408         for (i = 0; i < len; i++) {
 409                 int ch = nonce[i] & 0xFF;
 410                 if (isalnum(ch) ||
 411                     ch == '-' || ch == '.' ||
 412                     ch == '/' || ch == '+' ||
 413                     ch == '=' || ch == '_')
 414                         continue;
 415                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 416                     len, nonce);
 417         }
 418 }
 419
 420 static void get_commons_through_negotiation(const char *url,
 421                                             const struct ref *remote_refs,
 422                                             struct oid_array *commons)
 423 {
 424         struct child_process child = CHILD_PROCESS_INIT;
 425         const struct ref *ref;
 426         int len = the_hash_algo->hexsz + 1; /* hash + NL */
 427
 428         child.git_cmd = 1;
 429         child.no_stdin = 1;
 430         child.out = -1;
 431         strvec_pushl(&child.args, "fetch", "--negotiate-only", NULL);
 432         for (ref = remote_refs; ref; ref = ref->next) {
 433                 if (!is_null_oid(&ref->new_oid))
 434                         strvec_pushf(&child.args, "--negotiation-tip=%s", oid_to_hex(&ref->new_oid));
 435         }
 436         strvec_push(&child.args, url);
 437
 438         if (start_command(&child))
 439                 die(_("send-pack: unable to fork off fetch subprocess"));
 440
 441         do {
 442                 char hex_hash[GIT_MAX_HEXSZ + 1];
 443                 int read_len = read_in_full(child.out, hex_hash, len);
 444                 struct object_id oid;
 445                 const char *end;
 446
 447                 if (!read_len)
 448                         break;
 449                 if (read_len != len)
 450                         die("invalid length read %d", read_len);
 451                 if (parse_oid_hex(hex_hash, &oid, &end) || *end != '\n')
 452                         die("invalid hash");
 453                 oid_array_append(commons, &oid);
 454         } while (1);
 455
 456         if (finish_command(&child)) {
 457                 /*
 458                  * The information that push negotiation provides is useful but
 459                  * not mandatory.
 460                  */
 461                 warning(_("push negotiation failed; proceeding anyway with push"));
 462         }
 463 }
 464
 465 int send_pack(struct send_pack_args *args,
 466               int fd[], struct child_process *conn,
 467               struct ref *remote_refs,
 468               struct oid_array *extra_have)
 469 {
 470         struct oid_array commons = OID_ARRAY_INIT;
 471         int in = fd[0];
 472         int out = fd[1];
 473         struct strbuf req_buf = STRBUF_INIT;
 474         struct strbuf cap_buf = STRBUF_INIT;
 475         struct ref *ref;
 476         int need_pack_data = 0;
 477         int allow_deleting_refs = 0;
 478         int status_report = 0;
 479         int use_sideband = 0;
 480         int quiet_supported = 0;
 481         int agent_supported = 0;
 482         int advertise_sid = 0;
 483         int push_negotiate = 0;
 484         int use_atomic = 0;
 485         int atomic_supported = 0;
 486         int use_push_options = 0;
 487         int push_options_supported = 0;
 488         int object_format_supported = 0;
 489         unsigned cmds_sent = 0;
 490         int ret;
 491         struct async demux;
 492         const char *push_cert_nonce = NULL;
 493         struct packet_reader reader;
 494         int use_bitmaps;
 495
 496         if (!remote_refs) {
 497                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 498                         "Perhaps you should specify a branch.\n");
 499                 return 0;
 500         }
 501
 502         git_config_get_bool("push.negotiate", &push_negotiate);
 503         if (push_negotiate)
 504                 get_commons_through_negotiation(args->url, remote_refs, &commons);
 505
 506         if (!git_config_get_bool("push.usebitmaps", &use_bitmaps))
 507                 args->disable_bitmaps = !use_bitmaps;
 508
 509         git_config_get_bool("transfer.advertisesid", &advertise_sid);
 510
 511         /* Does the other end support the reporting? */
 512         if (server_supports("report-status-v2"))
 513                 status_report = 2;
 514         else if (server_supports("report-status"))
 515                 status_report = 1;
 516         if (server_supports("delete-refs"))
 517                 allow_deleting_refs = 1;
 518         if (server_supports("ofs-delta"))
 519                 args->use_ofs_delta = 1;
 520         if (server_supports("side-band-64k"))
 521                 use_sideband = 1;
 522         if (server_supports("quiet"))
 523                 quiet_supported = 1;
 524         if (server_supports("agent"))
 525                 agent_supported = 1;
 526         if (!server_supports("session-id"))
 527                 advertise_sid = 0;
 528         if (server_supports("no-thin"))
 529                 args->use_thin_pack = 0;
 530         if (server_supports("atomic"))
 531                 atomic_supported = 1;
 532         if (server_supports("push-options"))
 533                 push_options_supported = 1;
 534
 535         if (!server_supports_hash(the_hash_algo->name, &object_format_supported))
 536                 die(_("the receiving end does not support this repository's hash algorithm"));
 537
 538         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
 539                 int len;
 540                 push_cert_nonce = server_feature_value("push-cert", &len);
 541                 if (push_cert_nonce) {
 542                         reject_invalid_nonce(push_cert_nonce, len);
 543                         push_cert_nonce = xmemdupz(push_cert_nonce, len);
 544                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
 545                         die(_("the receiving end does not support --signed push"));
 546                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
 547                         warning(_("not sending a push certificate since the"
 548                                   " receiving end does not support --signed"
 549                                   " push"));
 550                 }
 551         }
 552
 553         if (args->atomic && !atomic_supported)
 554                 die(_("the receiving end does not support --atomic push"));
 555
 556         use_atomic = atomic_supported && args->atomic;
 557
 558         if (args->push_options && !push_options_supported)
 559                 die(_("the receiving end does not support push options"));
 560
 561         use_push_options = push_options_supported && args->push_options;
 562
 563         if (status_report == 1)
 564                 strbuf_addstr(&cap_buf, " report-status");
 565         else if (status_report == 2)
 566                 strbuf_addstr(&cap_buf, " report-status-v2");
 567         if (use_sideband)
 568                 strbuf_addstr(&cap_buf, " side-band-64k");
 569         if (quiet_supported && (args->quiet || !args->progress))
 570                 strbuf_addstr(&cap_buf, " quiet");
 571         if (use_atomic)
 572                 strbuf_addstr(&cap_buf, " atomic");
 573         if (use_push_options)
 574                 strbuf_addstr(&cap_buf, " push-options");
 575         if (object_format_supported)
 576                 strbuf_addf(&cap_buf, " object-format=%s", the_hash_algo->name);
 577         if (agent_supported)
 578                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 579         if (advertise_sid)
 580                 strbuf_addf(&cap_buf, " session-id=%s", trace2_session_id());
 581
 582         /*
 583          * NEEDSWORK: why does delete-refs have to be so specific to
 584          * send-pack machinery that set_ref_status_for_push() cannot
 585          * set this bit for us???
 586          */
 587         for (ref = remote_refs; ref; ref = ref->next)
 588                 if (ref->deletion && !allow_deleting_refs)
 589                         ref->status = REF_STATUS_REJECT_NODELETE;
 590
 591         /*
 592          * Clear the status for each ref and see if we need to send
 593          * the pack data.
 594          */
 595         for (ref = remote_refs; ref; ref = ref->next) {
 596                 switch (check_to_send_update(ref, args)) {
 597                 case 0: /* no error */
 598                         break;
 599                 case CHECK_REF_STATUS_REJECTED:
 600                         /*
 601                          * When we know the server would reject a ref update if
 602                          * we were to send it and we're trying to send the refs
 603                          * atomically, abort the whole operation.
 604                          */
 605                         if (use_atomic) {
 606                                 strbuf_release(&req_buf);
 607                                 strbuf_release(&cap_buf);
 608                                 reject_atomic_push(remote_refs, args->send_mirror);
 609                                 error("atomic push failed for ref %s. status: %d\n",
 610                                       ref->name, ref->status);
 611                                 return args->porcelain ? 0 : -1;
 612                         }
 613                         /* else fallthrough */
 614                 default:
 615                         continue;
 616                 }
 617                 if (!ref->deletion)
 618                         need_pack_data = 1;
 619
 620                 if (args->dry_run || !status_report)
 621                         ref->status = REF_STATUS_OK;
 622                 else
 623                         ref->status = REF_STATUS_EXPECTING_REPORT;
 624         }
 625
 626         if (!args->dry_run)
 627                 advertise_shallow_grafts_buf(&req_buf);
 628
 629         /*
 630          * Finally, tell the other end!
 631          */
 632         if (!args->dry_run && push_cert_nonce)
 633                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 634                                                cap_buf.buf, push_cert_nonce);
 635         else if (!args->dry_run)
 636                 for (ref = remote_refs; ref; ref = ref->next) {
 637                         char *old_hex, *new_hex;
 638
 639                         if (check_to_send_update(ref, args) < 0)
 640                                 continue;
 641
 642                         old_hex = oid_to_hex(&ref->old_oid);
 643                         new_hex = oid_to_hex(&ref->new_oid);
 644                         if (!cmds_sent) {
 645                                 packet_buf_write(&req_buf,
 646                                                  "%s %s %s%c%s",
 647                                                  old_hex, new_hex, ref->name, 0,
 648                                                  cap_buf.buf);
 649                                 cmds_sent = 1;
 650                         } else {
 651                                 packet_buf_write(&req_buf, "%s %s %s",
 652                                                  old_hex, new_hex, ref->name);
 653                         }
 654                 }
 655
 656         if (use_push_options) {
 657                 struct string_list_item *item;
 658
 659                 packet_buf_flush(&req_buf);
 660                 for_each_string_list_item(item, args->push_options)
 661                         packet_buf_write(&req_buf, "%s", item->string);
 662         }
 663
 664         if (args->stateless_rpc) {
 665                 if (!args->dry_run && (cmds_sent || is_repository_shallow(the_repository))) {
 666                         packet_buf_flush(&req_buf);
 667                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 668                 }
 669         } else {
 670                 write_or_die(out, req_buf.buf, req_buf.len);
 671                 packet_flush(out);
 672         }
 673         strbuf_release(&req_buf);
 674         strbuf_release(&cap_buf);
 675
 676         if (use_sideband && cmds_sent) {
 677                 memset(&demux, 0, sizeof(demux));
 678                 demux.proc = sideband_demux;
 679                 demux.data = fd;
 680                 demux.out = -1;
 681                 demux.isolate_sigpipe = 1;
 682                 if (start_async(&demux))
 683                         die("send-pack: unable to fork off sideband demultiplexer");
 684                 in = demux.out;
 685         }
 686
 687         packet_reader_init(&reader, in, NULL, 0,
 688                            PACKET_READ_CHOMP_NEWLINE |
 689                            PACKET_READ_DIE_ON_ERR_PACKET);
 690
 691         if (need_pack_data && cmds_sent) {
 692                 if (pack_objects(out, remote_refs, extra_have, &commons, args) < 0) {
 693                         if (args->stateless_rpc)
 694                                 close(out);
 695                         if (git_connection_is_socket(conn))
 696                                 shutdown(fd[0], SHUT_WR);
 697
 698                         /*
 699                          * Do not even bother with the return value; we know we
 700                          * are failing, and just want the error() side effects,
 701                          * as well as marking refs with their remote status (if
 702                          * we get one).
 703                          */
 704                         if (status_report)
 705                                 receive_status(&reader, remote_refs);
 706
 707                         if (use_sideband) {
 708                                 close(demux.out);
 709                                 finish_async(&demux);
 710                         }
 711                         fd[1] = -1;
 712                         return -1;
 713                 }
 714                 if (!args->stateless_rpc)
 715                         /* Closed by pack_objects() via start_command() */
 716                         fd[1] = -1;
 717         }
 718         if (args->stateless_rpc && cmds_sent)
 719                 packet_flush(out);
 720
 721         if (status_report && cmds_sent)
 722                 ret = receive_status(&reader, remote_refs);
 723         else
 724                 ret = 0;
 725         if (args->stateless_rpc)
 726                 packet_flush(out);
 727
 728         if (use_sideband && cmds_sent) {
 729                 close(demux.out);
 730                 if (finish_async(&demux)) {
 731                         error("error in sideband demultiplexer");
 732                         ret = -1;
 733                 }
 734         }
 735
 736         if (ret < 0)
 737                 return ret;
 738
 739         if (args->porcelain)
 740                 return 0;
 741
 742         for (ref = remote_refs; ref; ref = ref->next) {
 743                 switch (ref->status) {
 744                 case REF_STATUS_NONE:
 745                 case REF_STATUS_UPTODATE:
 746                 case REF_STATUS_OK:
 747                         break;
 748                 default:
 749                         return -1;
 750                 }
 751         }
 752         return 0;
 753 }