send-pack.c

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