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