send-pack.c

   1 #include "git-compat-util.h"
   2 #include "config.h"
   3 #include "commit.h"
   4 #include "date.h"
   5 #include "gettext.h"
   6 #include "hex.h"
   7 #include "refs.h"
   8 #include "object-store-ll.h"
   9 #include "pkt-line.h"
  10 #include "sideband.h"
  11 #include "run-command.h"
  12 #include "remote.h"
  13 #include "connect.h"
  14 #include "send-pack.h"
  15 #include "quote.h"
  16 #include "transport.h"
  17 #include "version.h"
  18 #include "oid-array.h"
  19 #include "gpg-interface.h"
  20 #include "shallow.h"
  21 #include "parse-options.h"
  22 #include "trace2.h"
  23 #include "write-or-die.h"
  24
  25 int option_parse_push_signed(const struct option *opt,
  26                              const char *arg, int unset)
  27 {
  28         if (unset) {
  29                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
  30                 return 0;
  31         }
  32         switch (git_parse_maybe_bool(arg)) {
  33         case 1:
  34                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
  35                 return 0;
  36         case 0:
  37                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
  38                 return 0;
  39         }
  40         if (!strcasecmp("if-asked", arg)) {
  41                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
  42                 return 0;
  43         }
  44         die("bad %s argument: %s", opt->long_name, arg);
  45 }
  46
  47 static void feed_object(const struct object_id *oid, FILE *fh, int negative)
  48 {
  49         if (negative &&
  50             !repo_has_object_file_with_flags(the_repository, oid,
  51                                              OBJECT_INFO_SKIP_FETCH_OBJECT |
  52                                              OBJECT_INFO_QUICK))
  53                 return;
  54
  55         if (negative)
  56                 putc('^', fh);
  57         fputs(oid_to_hex(oid), fh);
  58         putc('\n', fh);
  59 }
  60
  61 /*
  62  * Make a pack stream and spit it out into file descriptor fd
  63  */
  64 static int pack_objects(int fd, struct ref *refs, struct oid_array *advertised,
  65                         struct oid_array *negotiated,
  66                         struct send_pack_args *args)
  67 {
  68         /*
  69          * The child becomes pack-objects --revs; we feed
  70          * the revision parameters to it via its stdin and
  71          * let its stdout go back to the other end.
  72          */
  73         struct child_process po = CHILD_PROCESS_INIT;
  74         FILE *po_in;
  75         int i;
  76         int rc;
  77
  78         strvec_push(&po.args, "pack-objects");
  79         strvec_push(&po.args, "--all-progress-implied");
  80         strvec_push(&po.args, "--revs");
  81         strvec_push(&po.args, "--stdout");
  82         if (args->use_thin_pack)
  83                 strvec_push(&po.args, "--thin");
  84         if (args->use_ofs_delta)
  85                 strvec_push(&po.args, "--delta-base-offset");
  86         if (args->quiet || !args->progress)
  87                 strvec_push(&po.args, "-q");
  88         if (args->progress)
  89                 strvec_push(&po.args, "--progress");
  90         if (is_repository_shallow(the_repository))
  91                 strvec_push(&po.args, "--shallow");
  92         if (args->disable_bitmaps)
  93                 strvec_push(&po.args, "--no-use-bitmap-index");
  94         po.in = -1;
  95         po.out = args->stateless_rpc ? -1 : fd;
  96         po.git_cmd = 1;
  97         po.clean_on_exit = 1;
  98         if (start_command(&po))
  99                 die_errno("git pack-objects failed");
 100
 101         /*
 102          * We feed the pack-objects we just spawned with revision
 103          * parameters by writing to the pipe.
 104          */
 105         po_in = xfdopen(po.in, "w");
 106         for (i = 0; i < advertised->nr; i++)
 107                 feed_object(&advertised->oid[i], po_in, 1);
 108         for (i = 0; i < negotiated->nr; i++)
 109                 feed_object(&negotiated->oid[i], po_in, 1);
 110
 111         while (refs) {
 112                 if (!is_null_oid(&refs->old_oid))
 113                         feed_object(&refs->old_oid, po_in, 1);
 114                 if (!is_null_oid(&refs->new_oid))
 115                         feed_object(&refs->new_oid, po_in, 0);
 116                 refs = refs->next;
 117         }
 118
 119         fflush(po_in);
 120         if (ferror(po_in))
 121                 die_errno("error writing to pack-objects");
 122         fclose(po_in);
 123
 124         if (args->stateless_rpc) {
 125                 char *buf = xmalloc(LARGE_PACKET_MAX);
 126                 while (1) {
 127                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
 128                         if (n <= 0)
 129                                 break;
 130                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
 131                 }
 132                 free(buf);
 133                 close(po.out);
 134                 po.out = -1;
 135         }
 136
 137         rc = finish_command(&po);
 138         if (rc) {
 139                 /*
 140                  * For a normal non-zero exit, we assume pack-objects wrote
 141                  * something useful to stderr. For death by signal, though,
 142                  * we should mention it to the user. The exception is SIGPIPE
 143                  * (141), because that's a normal occurrence if the remote end
 144                  * hangs up (and we'll report that by trying to read the unpack
 145                  * status).
 146                  */
 147                 if (rc > 128 && rc != 141)
 148                         error("pack-objects died of signal %d", rc - 128);
 149                 return -1;
 150         }
 151         return 0;
 152 }
 153
 154 static int receive_unpack_status(struct packet_reader *reader)
 155 {
 156         if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 157                 return error(_("unexpected flush packet while reading remote unpack status"));
 158         if (!skip_prefix(reader->line, "unpack ", &reader->line))
 159                 return error(_("unable to parse remote unpack status: %s"), reader->line);
 160         if (strcmp(reader->line, "ok"))
 161                 return error(_("remote unpack failed: %s"), reader->line);
 162         return 0;
 163 }
 164
 165 static int receive_status(struct packet_reader *reader, struct ref *refs)
 166 {
 167         struct ref *hint;
 168         int ret;
 169         struct ref_push_report *report = NULL;
 170         int new_report = 0;
 171         int once = 0;
 172
 173         hint = NULL;
 174         ret = receive_unpack_status(reader);
 175         while (1) {
 176                 struct object_id old_oid, new_oid;
 177                 const char *head;
 178                 const char *refname;
 179                 char *p;
 180                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 181                         break;
 182                 head = reader->line;
 183                 p = strchr(head, ' ');
 184                 if (!p) {
 185                         error("invalid status line from remote: %s", reader->line);
 186                         ret = -1;
 187                         break;
 188                 }
 189                 *p++ = '\0';
 190
 191                 if (!strcmp(head, "option")) {
 192                         const char *key, *val;
 193
 194                         if (!hint || !(report || new_report)) {
 195                                 if (!once++)
 196                                         error("'option' without a matching 'ok/ng' directive");
 197                                 ret = -1;
 198                                 continue;
 199                         }
 200                         if (new_report) {
 201                                 if (!hint->report) {
 202                                         CALLOC_ARRAY(hint->report, 1);
 203                                         report = hint->report;
 204                                 } else {
 205                                         report = hint->report;
 206                                         while (report->next)
 207                                                 report = report->next;
 208                                         CALLOC_ARRAY(report->next, 1);
 209                                         report = report->next;
 210                                 }
 211                                 new_report = 0;
 212                         }
 213                         key = p;
 214                         p = strchr(key, ' ');
 215                         if (p)
 216                                 *p++ = '\0';
 217                         val = p;
 218                         if (!strcmp(key, "refname"))
 219                                 report->ref_name = xstrdup_or_null(val);
 220                         else if (!strcmp(key, "old-oid") && val &&
 221                                  !parse_oid_hex(val, &old_oid, &val))
 222                                 report->old_oid = oiddup(&old_oid);
 223                         else if (!strcmp(key, "new-oid") && val &&
 224                                  !parse_oid_hex(val, &new_oid, &val))
 225                                 report->new_oid = oiddup(&new_oid);
 226                         else if (!strcmp(key, "forced-update"))
 227                                 report->forced_update = 1;
 228                         continue;
 229                 }
 230
 231                 report = NULL;
 232                 new_report = 0;
 233                 if (strcmp(head, "ok") && strcmp(head, "ng")) {
 234                         error("invalid ref status from remote: %s", head);
 235                         ret = -1;
 236                         break;
 237                 }
 238                 refname = p;
 239                 p = strchr(refname, ' ');
 240                 if (p)
 241                         *p++ = '\0';
 242                 /* first try searching at our hint, falling back to all refs */
 243                 if (hint)
 244                         hint = find_ref_by_name(hint, refname);
 245                 if (!hint)
 246                         hint = find_ref_by_name(refs, refname);
 247                 if (!hint) {
 248                         warning("remote reported status on unknown ref: %s",
 249                                 refname);
 250                         continue;
 251                 }
 252                 if (hint->status != REF_STATUS_EXPECTING_REPORT &&
 253                     hint->status != REF_STATUS_OK &&
 254                     hint->status != REF_STATUS_REMOTE_REJECT) {
 255                         warning("remote reported status on unexpected ref: %s",
 256                                 refname);
 257                         continue;
 258                 }
 259                 if (!strcmp(head, "ng")) {
 260                         hint->status = REF_STATUS_REMOTE_REJECT;
 261                         if (p)
 262                                 hint->remote_status = xstrdup(p);
 263                         else
 264                                 hint->remote_status = "failed";
 265                 } else {
 266                         hint->status = REF_STATUS_OK;
 267                         hint->remote_status = xstrdup_or_null(p);
 268                         new_report = 1;
 269                 }
 270         }
 271         return ret;
 272 }
 273
 274 static int sideband_demux(int in UNUSED, int out, void *data)
 275 {
 276         int *fd = data, ret;
 277         if (async_with_fork())
 278                 close(fd[1]);
 279         ret = recv_sideband("send-pack", fd[0], out);
 280         close(out);
 281         return ret;
 282 }
 283
 284 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 285 {
 286         struct strbuf *sb = cb;
 287         if (graft->nr_parent == -1)
 288                 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
 289         return 0;
 290 }
 291
 292 static void advertise_shallow_grafts_buf(struct strbuf *sb)
 293 {
 294         if (!is_repository_shallow(the_repository))
 295                 return;
 296         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 297 }
 298
 299 #define CHECK_REF_NO_PUSH -1
 300 #define CHECK_REF_STATUS_REJECTED -2
 301 #define CHECK_REF_UPTODATE -3
 302 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
 303 {
 304         if (!ref->peer_ref && !args->send_mirror)
 305                 return CHECK_REF_NO_PUSH;
 306
 307         /* Check for statuses set by set_ref_status_for_push() */
 308         switch (ref->status) {
 309         case REF_STATUS_REJECT_NONFASTFORWARD:
 310         case REF_STATUS_REJECT_ALREADY_EXISTS:
 311         case REF_STATUS_REJECT_FETCH_FIRST:
 312         case REF_STATUS_REJECT_NEEDS_FORCE:
 313         case REF_STATUS_REJECT_STALE:
 314         case REF_STATUS_REJECT_REMOTE_UPDATED:
 315         case REF_STATUS_REJECT_NODELETE:
 316                 return CHECK_REF_STATUS_REJECTED;
 317         case REF_STATUS_UPTODATE:
 318                 return CHECK_REF_UPTODATE;
 319
 320         default:
 321         case REF_STATUS_EXPECTING_REPORT:
 322                 /* already passed checks on the local side */
 323         case REF_STATUS_OK:
 324                 /* of course this is OK */
 325                 return 0;
 326         }
 327 }
 328
 329 /*
 330  * the beginning of the next line, or the end of buffer.
 331  *
 332  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 333  * convert many similar uses found by "git grep -A4 memchr".
 334  */
 335 static const char *next_line(const char *line, size_t len)
 336 {
 337         const char *nl = memchr(line, '\n', len);
 338         if (!nl)
 339                 return line + len; /* incomplete line */
 340         return nl + 1;
 341 }
 342
 343 static int generate_push_cert(struct strbuf *req_buf,
 344                               const struct ref *remote_refs,
 345                               struct send_pack_args *args,
 346                               const char *cap_string,
 347                               const char *push_cert_nonce)
 348 {
 349         const struct ref *ref;
 350         struct string_list_item *item;
 351         char *signing_key_id = xstrdup(get_signing_key_id());
 352         const char *cp, *np;
 353         struct strbuf cert = STRBUF_INIT;
 354         int update_seen = 0;
 355
 356         strbuf_addstr(&cert, "certificate version 0.1\n");
 357         strbuf_addf(&cert, "pusher %s ", signing_key_id);
 358         datestamp(&cert);
 359         strbuf_addch(&cert, '\n');
 360         if (args->url && *args->url) {
 361                 char *anon_url = transport_anonymize_url(args->url);
 362                 strbuf_addf(&cert, "pushee %s\n", anon_url);
 363                 free(anon_url);
 364         }
 365         if (push_cert_nonce[0])
 366                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
 367         if (args->push_options)
 368                 for_each_string_list_item(item, args->push_options)
 369                         strbuf_addf(&cert, "push-option %s\n", item->string);
 370         strbuf_addstr(&cert, "\n");
 371
 372         for (ref = remote_refs; ref; ref = ref->next) {
 373                 if (check_to_send_update(ref, args) < 0)
 374                         continue;
 375                 update_seen = 1;
 376                 strbuf_addf(&cert, "%s %s %s\n",
 377                             oid_to_hex(&ref->old_oid),
 378                             oid_to_hex(&ref->new_oid),
 379                             ref->name);
 380         }
 381         if (!update_seen)
 382                 goto free_return;
 383
 384         if (sign_buffer(&cert, &cert, get_signing_key()))
 385                 die(_("failed to sign the push certificate"));
 386
 387         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 388         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 389                 np = next_line(cp, cert.buf + cert.len - cp);
 390                 packet_buf_write(req_buf,
 391                                  "%.*s", (int)(np - cp), cp);
 392         }
 393         packet_buf_write(req_buf, "push-cert-end\n");
 394
 395 free_return:
 396         free(signing_key_id);
 397         strbuf_release(&cert);
 398         return update_seen;
 399 }
 400
 401 #define NONCE_LEN_LIMIT 256
 402
 403 static void reject_invalid_nonce(const char *nonce, int len)
 404 {
 405         int i = 0;
 406
 407         if (NONCE_LEN_LIMIT <= len)
 408                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 409                     len, nonce);
 410
 411         for (i = 0; i < len; i++) {
 412                 int ch = nonce[i] & 0xFF;
 413                 if (isalnum(ch) ||
 414                     ch == '-' || ch == '.' ||
 415                     ch == '/' || ch == '+' ||
 416                     ch == '=' || ch == '_')
 417                         continue;
 418                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 419                     len, nonce);
 420         }
 421 }
 422
 423 static void get_commons_through_negotiation(const char *url,
 424                                             const struct ref *remote_refs,
 425                                             struct oid_array *commons)
 426 {
 427         struct child_process child = CHILD_PROCESS_INIT;
 428         const struct ref *ref;
 429         int len = the_hash_algo->hexsz + 1; /* hash + NL */
 430
 431         child.git_cmd = 1;
 432         child.no_stdin = 1;
 433         child.out = -1;
 434         strvec_pushl(&child.args, "fetch", "--negotiate-only", NULL);
 435         for (ref = remote_refs; ref; ref = ref->next) {
 436                 if (!is_null_oid(&ref->new_oid))
 437                         strvec_pushf(&child.args, "--negotiation-tip=%s", oid_to_hex(&ref->new_oid));
 438         }
 439         strvec_push(&child.args, url);
 440
 441         if (start_command(&child))
 442                 die(_("send-pack: unable to fork off fetch subprocess"));
 443
 444         do {
 445                 char hex_hash[GIT_MAX_HEXSZ + 1];
 446                 int read_len = read_in_full(child.out, hex_hash, len);
 447                 struct object_id oid;
 448                 const char *end;
 449
 450                 if (!read_len)
 451                         break;
 452                 if (read_len != len)
 453                         die("invalid length read %d", read_len);
 454                 if (parse_oid_hex(hex_hash, &oid, &end) || *end != '\n')
 455                         die("invalid hash");
 456                 oid_array_append(commons, &oid);
 457         } while (1);
 458
 459         if (finish_command(&child)) {
 460                 /*
 461                  * The information that push negotiation provides is useful but
 462                  * not mandatory.
 463                  */
 464                 warning(_("push negotiation failed; proceeding anyway with push"));
 465         }
 466 }
 467
 468 int send_pack(struct send_pack_args *args,
 469               int fd[], struct child_process *conn,
 470               struct ref *remote_refs,
 471               struct oid_array *extra_have)
 472 {
 473         struct oid_array commons = OID_ARRAY_INIT;
 474         int in = fd[0];
 475         int out = fd[1];
 476         struct strbuf req_buf = STRBUF_INIT;
 477         struct strbuf cap_buf = STRBUF_INIT;
 478         struct ref *ref;
 479         int need_pack_data = 0;
 480         int allow_deleting_refs = 0;
 481         int status_report = 0;
 482         int use_sideband = 0;
 483         int quiet_supported = 0;
 484         int agent_supported = 0;
 485         int advertise_sid = 0;
 486         int push_negotiate = 0;
 487         int use_atomic = 0;
 488         int atomic_supported = 0;
 489         int use_push_options = 0;
 490         int push_options_supported = 0;
 491         int object_format_supported = 0;
 492         unsigned cmds_sent = 0;
 493         int ret;
 494         struct async demux;
 495         const char *push_cert_nonce = NULL;
 496         struct packet_reader reader;
 497         int use_bitmaps;
 498
 499         if (!remote_refs) {
 500                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 501                         "Perhaps you should specify a branch.\n");
 502                 return 0;
 503         }
 504
 505         git_config_get_bool("push.negotiate", &push_negotiate);
 506         if (push_negotiate)
 507                 get_commons_through_negotiation(args->url, remote_refs, &commons);
 508
 509         if (!git_config_get_bool("push.usebitmaps", &use_bitmaps))
 510                 args->disable_bitmaps = !use_bitmaps;
 511
 512         git_config_get_bool("transfer.advertisesid", &advertise_sid);
 513
 514         /* Does the other end support the reporting? */
 515         if (server_supports("report-status-v2"))
 516                 status_report = 2;
 517         else if (server_supports("report-status"))
 518                 status_report = 1;
 519         if (server_supports("delete-refs"))
 520                 allow_deleting_refs = 1;
 521         if (server_supports("ofs-delta"))
 522                 args->use_ofs_delta = 1;
 523         if (server_supports("side-band-64k"))
 524                 use_sideband = 1;
 525         if (server_supports("quiet"))
 526                 quiet_supported = 1;
 527         if (server_supports("agent"))
 528                 agent_supported = 1;
 529         if (!server_supports("session-id"))
 530                 advertise_sid = 0;
 531         if (server_supports("no-thin"))
 532                 args->use_thin_pack = 0;
 533         if (server_supports("atomic"))
 534                 atomic_supported = 1;
 535         if (server_supports("push-options"))
 536                 push_options_supported = 1;
 537
 538         if (!server_supports_hash(the_hash_algo->name, &object_format_supported))
 539                 die(_("the receiving end does not support this repository's hash algorithm"));
 540
 541         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
 542                 size_t len;
 543                 push_cert_nonce = server_feature_value("push-cert", &len);
 544                 if (push_cert_nonce) {
 545                         reject_invalid_nonce(push_cert_nonce, len);
 546                         push_cert_nonce = xmemdupz(push_cert_nonce, len);
 547                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
 548                         die(_("the receiving end does not support --signed push"));
 549                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
 550                         warning(_("not sending a push certificate since the"
 551                                   " receiving end does not support --signed"
 552                                   " push"));
 553                 }
 554         }
 555
 556         if (args->atomic && !atomic_supported)
 557                 die(_("the receiving end does not support --atomic push"));
 558
 559         use_atomic = atomic_supported && args->atomic;
 560
 561         if (args->push_options && !push_options_supported)
 562                 die(_("the receiving end does not support push options"));
 563
 564         use_push_options = push_options_supported && args->push_options;
 565
 566         if (status_report == 1)
 567                 strbuf_addstr(&cap_buf, " report-status");
 568         else if (status_report == 2)
 569                 strbuf_addstr(&cap_buf, " report-status-v2");
 570         if (use_sideband)
 571                 strbuf_addstr(&cap_buf, " side-band-64k");
 572         if (quiet_supported && (args->quiet || !args->progress))
 573                 strbuf_addstr(&cap_buf, " quiet");
 574         if (use_atomic)
 575                 strbuf_addstr(&cap_buf, " atomic");
 576         if (use_push_options)
 577                 strbuf_addstr(&cap_buf, " push-options");
 578         if (object_format_supported)
 579                 strbuf_addf(&cap_buf, " object-format=%s", the_hash_algo->name);
 580         if (agent_supported)
 581                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 582         if (advertise_sid)
 583                 strbuf_addf(&cap_buf, " session-id=%s", trace2_session_id());
 584
 585         /*
 586          * NEEDSWORK: why does delete-refs have to be so specific to
 587          * send-pack machinery that set_ref_status_for_push() cannot
 588          * set this bit for us???
 589          */
 590         for (ref = remote_refs; ref; ref = ref->next)
 591                 if (ref->deletion && !allow_deleting_refs)
 592                         ref->status = REF_STATUS_REJECT_NODELETE;
 593
 594         /*
 595          * Clear the status for each ref and see if we need to send
 596          * the pack data.
 597          */
 598         for (ref = remote_refs; ref; ref = ref->next) {
 599                 switch (check_to_send_update(ref, args)) {
 600                 case 0: /* no error */
 601                         break;
 602                 case CHECK_REF_STATUS_REJECTED:
 603                         /*
 604                          * When we know the server would reject a ref update if
 605                          * we were to send it and we're trying to send the refs
 606                          * atomically, abort the whole operation.
 607                          */
 608                         if (use_atomic) {
 609                                 strbuf_release(&req_buf);
 610                                 strbuf_release(&cap_buf);
 611                                 reject_atomic_push(remote_refs, args->send_mirror);
 612                                 error("atomic push failed for ref %s. status: %d\n",
 613                                       ref->name, ref->status);
 614                                 return args->porcelain ? 0 : -1;
 615                         }
 616                         /* else fallthrough */
 617                 default:
 618                         continue;
 619                 }
 620                 if (!ref->deletion)
 621                         need_pack_data = 1;
 622
 623                 if (args->dry_run || !status_report)
 624                         ref->status = REF_STATUS_OK;
 625                 else
 626                         ref->status = REF_STATUS_EXPECTING_REPORT;
 627         }
 628
 629         if (!args->dry_run)
 630                 advertise_shallow_grafts_buf(&req_buf);
 631
 632         /*
 633          * Finally, tell the other end!
 634          */
 635         if (!args->dry_run && push_cert_nonce)
 636                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 637                                                cap_buf.buf, push_cert_nonce);
 638         else if (!args->dry_run)
 639                 for (ref = remote_refs; ref; ref = ref->next) {
 640                         char *old_hex, *new_hex;
 641
 642                         if (check_to_send_update(ref, args) < 0)
 643                                 continue;
 644
 645                         old_hex = oid_to_hex(&ref->old_oid);
 646                         new_hex = oid_to_hex(&ref->new_oid);
 647                         if (!cmds_sent) {
 648                                 packet_buf_write(&req_buf,
 649                                                  "%s %s %s%c%s",
 650                                                  old_hex, new_hex, ref->name, 0,
 651                                                  cap_buf.buf);
 652                                 cmds_sent = 1;
 653                         } else {
 654                                 packet_buf_write(&req_buf, "%s %s %s",
 655                                                  old_hex, new_hex, ref->name);
 656                         }
 657                 }
 658
 659         if (use_push_options) {
 660                 struct string_list_item *item;
 661
 662                 packet_buf_flush(&req_buf);
 663                 for_each_string_list_item(item, args->push_options)
 664                         packet_buf_write(&req_buf, "%s", item->string);
 665         }
 666
 667         if (args->stateless_rpc) {
 668                 if (!args->dry_run && (cmds_sent || is_repository_shallow(the_repository))) {
 669                         packet_buf_flush(&req_buf);
 670                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 671                 }
 672         } else {
 673                 write_or_die(out, req_buf.buf, req_buf.len);
 674                 packet_flush(out);
 675         }
 676         strbuf_release(&req_buf);
 677         strbuf_release(&cap_buf);
 678
 679         if (use_sideband && cmds_sent) {
 680                 memset(&demux, 0, sizeof(demux));
 681                 demux.proc = sideband_demux;
 682                 demux.data = fd;
 683                 demux.out = -1;
 684                 demux.isolate_sigpipe = 1;
 685                 if (start_async(&demux))
 686                         die("send-pack: unable to fork off sideband demultiplexer");
 687                 in = demux.out;
 688         }
 689
 690         packet_reader_init(&reader, in, NULL, 0,
 691                            PACKET_READ_CHOMP_NEWLINE |
 692                            PACKET_READ_DIE_ON_ERR_PACKET);
 693
 694         if (need_pack_data && cmds_sent) {
 695                 if (pack_objects(out, remote_refs, extra_have, &commons, args) < 0) {
 696                         if (args->stateless_rpc)
 697                                 close(out);
 698                         if (git_connection_is_socket(conn))
 699                                 shutdown(fd[0], SHUT_WR);
 700
 701                         /*
 702                          * Do not even bother with the return value; we know we
 703                          * are failing, and just want the error() side effects,
 704                          * as well as marking refs with their remote status (if
 705                          * we get one).
 706                          */
 707                         if (status_report)
 708                                 receive_status(&reader, remote_refs);
 709
 710                         if (use_sideband) {
 711                                 close(demux.out);
 712                                 finish_async(&demux);
 713                         }
 714                         fd[1] = -1;
 715                         return -1;
 716                 }
 717                 if (!args->stateless_rpc)
 718                         /* Closed by pack_objects() via start_command() */
 719                         fd[1] = -1;
 720         }
 721         if (args->stateless_rpc && cmds_sent)
 722                 packet_flush(out);
 723
 724         if (status_report && cmds_sent)
 725                 ret = receive_status(&reader, remote_refs);
 726         else
 727                 ret = 0;
 728         if (args->stateless_rpc)
 729                 packet_flush(out);
 730
 731         if (use_sideband && cmds_sent) {
 732                 close(demux.out);
 733                 if (finish_async(&demux)) {
 734                         error("error in sideband demultiplexer");
 735                         ret = -1;
 736                 }
 737         }
 738
 739         if (ret < 0)
 740                 return ret;
 741
 742         if (args->porcelain)
 743                 return 0;
 744
 745         for (ref = remote_refs; ref; ref = ref->next) {
 746                 switch (ref->status) {
 747                 case REF_STATUS_NONE:
 748                 case REF_STATUS_UPTODATE:
 749                 case REF_STATUS_OK:
 750                         break;
 751                 default:
 752                         return -1;
 753                 }
 754         }
 755         return 0;
 756 }