send-pack.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2
   3 #include "git-compat-util.h"
   4 #include "config.h"
   5 #include "commit.h"
   6 #include "date.h"
   7 #include "gettext.h"
   8 #include "hex.h"
   9 #include "object-store-ll.h"
  10 #include "pkt-line.h"
  11 #include "sideband.h"
  12 #include "run-command.h"
  13 #include "remote.h"
  14 #include "connect.h"
  15 #include "send-pack.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         trace2_region_enter("send_pack", "pack_objects", the_repository);
  79         strvec_push(&po.args, "pack-objects");
  80         strvec_push(&po.args, "--all-progress-implied");
  81         strvec_push(&po.args, "--revs");
  82         strvec_push(&po.args, "--stdout");
  83         if (args->use_thin_pack)
  84                 strvec_push(&po.args, "--thin");
  85         if (args->use_ofs_delta)
  86                 strvec_push(&po.args, "--delta-base-offset");
  87         if (args->quiet || !args->progress)
  88                 strvec_push(&po.args, "-q");
  89         if (args->progress)
  90                 strvec_push(&po.args, "--progress");
  91         if (is_repository_shallow(the_repository))
  92                 strvec_push(&po.args, "--shallow");
  93         if (args->disable_bitmaps)
  94                 strvec_push(&po.args, "--no-use-bitmap-index");
  95         po.in = -1;
  96         po.out = args->stateless_rpc ? -1 : fd;
  97         po.git_cmd = 1;
  98         po.clean_on_exit = 1;
  99         if (start_command(&po))
 100                 die_errno("git pack-objects failed");
 101
 102         /*
 103          * We feed the pack-objects we just spawned with revision
 104          * parameters by writing to the pipe.
 105          */
 106         po_in = xfdopen(po.in, "w");
 107         for (i = 0; i < advertised->nr; i++)
 108                 feed_object(&advertised->oid[i], po_in, 1);
 109         for (i = 0; i < negotiated->nr; i++)
 110                 feed_object(&negotiated->oid[i], po_in, 1);
 111
 112         while (refs) {
 113                 if (!is_null_oid(&refs->old_oid))
 114                         feed_object(&refs->old_oid, po_in, 1);
 115                 if (!is_null_oid(&refs->new_oid))
 116                         feed_object(&refs->new_oid, po_in, 0);
 117                 refs = refs->next;
 118         }
 119
 120         fflush(po_in);
 121         if (ferror(po_in))
 122                 die_errno("error writing to pack-objects");
 123         fclose(po_in);
 124
 125         if (args->stateless_rpc) {
 126                 char *buf = xmalloc(LARGE_PACKET_MAX);
 127                 while (1) {
 128                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
 129                         if (n <= 0)
 130                                 break;
 131                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
 132                 }
 133                 free(buf);
 134                 close(po.out);
 135                 po.out = -1;
 136         }
 137
 138         rc = finish_command(&po);
 139         if (rc) {
 140                 /*
 141                  * For a normal non-zero exit, we assume pack-objects wrote
 142                  * something useful to stderr. For death by signal, though,
 143                  * we should mention it to the user. The exception is SIGPIPE
 144                  * (141), because that's a normal occurrence if the remote end
 145                  * hangs up (and we'll report that by trying to read the unpack
 146                  * status).
 147                  */
 148                 if (rc > 128 && rc != 141)
 149                         error("pack-objects died of signal %d", rc - 128);
 150                 trace2_region_leave("send_pack", "pack_objects", the_repository);
 151                 return -1;
 152         }
 153         trace2_region_leave("send_pack", "pack_objects", the_repository);
 154         return 0;
 155 }
 156
 157 static int receive_unpack_status(struct packet_reader *reader)
 158 {
 159         if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 160                 return error(_("unexpected flush packet while reading remote unpack status"));
 161         if (!skip_prefix(reader->line, "unpack ", &reader->line))
 162                 return error(_("unable to parse remote unpack status: %s"), reader->line);
 163         if (strcmp(reader->line, "ok"))
 164                 return error(_("remote unpack failed: %s"), reader->line);
 165         return 0;
 166 }
 167
 168 static int receive_status(struct packet_reader *reader, struct ref *refs)
 169 {
 170         struct ref *hint;
 171         int ret;
 172         struct ref_push_report *report = NULL;
 173         int new_report = 0;
 174         int once = 0;
 175
 176         trace2_region_enter("send_pack", "receive_status", the_repository);
 177         hint = NULL;
 178         ret = receive_unpack_status(reader);
 179         while (1) {
 180                 struct object_id old_oid, new_oid;
 181                 const char *head;
 182                 const char *refname;
 183                 char *p;
 184                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 185                         break;
 186                 head = reader->line;
 187                 p = strchr(head, ' ');
 188                 if (!p) {
 189                         error("invalid status line from remote: %s", reader->line);
 190                         ret = -1;
 191                         break;
 192                 }
 193                 *p++ = '\0';
 194
 195                 if (!strcmp(head, "option")) {
 196                         const char *key, *val;
 197
 198                         if (!hint || !(report || new_report)) {
 199                                 if (!once++)
 200                                         error("'option' without a matching 'ok/ng' directive");
 201                                 ret = -1;
 202                                 continue;
 203                         }
 204                         if (new_report) {
 205                                 if (!hint->report) {
 206                                         CALLOC_ARRAY(hint->report, 1);
 207                                         report = hint->report;
 208                                 } else {
 209                                         report = hint->report;
 210                                         while (report->next)
 211                                                 report = report->next;
 212                                         CALLOC_ARRAY(report->next, 1);
 213                                         report = report->next;
 214                                 }
 215                                 new_report = 0;
 216                         }
 217                         key = p;
 218                         p = strchr(key, ' ');
 219                         if (p)
 220                                 *p++ = '\0';
 221                         val = p;
 222                         if (!strcmp(key, "refname"))
 223                                 report->ref_name = xstrdup_or_null(val);
 224                         else if (!strcmp(key, "old-oid") && val &&
 225                                  !parse_oid_hex(val, &old_oid, &val))
 226                                 report->old_oid = oiddup(&old_oid);
 227                         else if (!strcmp(key, "new-oid") && val &&
 228                                  !parse_oid_hex(val, &new_oid, &val))
 229                                 report->new_oid = oiddup(&new_oid);
 230                         else if (!strcmp(key, "forced-update"))
 231                                 report->forced_update = 1;
 232                         continue;
 233                 }
 234
 235                 report = NULL;
 236                 new_report = 0;
 237                 if (strcmp(head, "ok") && strcmp(head, "ng")) {
 238                         error("invalid ref status from remote: %s", head);
 239                         ret = -1;
 240                         break;
 241                 }
 242                 refname = p;
 243                 p = strchr(refname, ' ');
 244                 if (p)
 245                         *p++ = '\0';
 246                 /* first try searching at our hint, falling back to all refs */
 247                 if (hint)
 248                         hint = find_ref_by_name(hint, refname);
 249                 if (!hint)
 250                         hint = find_ref_by_name(refs, refname);
 251                 if (!hint) {
 252                         warning("remote reported status on unknown ref: %s",
 253                                 refname);
 254                         continue;
 255                 }
 256                 if (hint->status != REF_STATUS_EXPECTING_REPORT &&
 257                     hint->status != REF_STATUS_OK &&
 258                     hint->status != REF_STATUS_REMOTE_REJECT) {
 259                         warning("remote reported status on unexpected ref: %s",
 260                                 refname);
 261                         continue;
 262                 }
 263                 if (!strcmp(head, "ng")) {
 264                         hint->status = REF_STATUS_REMOTE_REJECT;
 265                         if (p)
 266                                 hint->remote_status = xstrdup(p);
 267                         else
 268                                 hint->remote_status = xstrdup("failed");
 269                 } else {
 270                         hint->status = REF_STATUS_OK;
 271                         hint->remote_status = xstrdup_or_null(p);
 272                         new_report = 1;
 273                 }
 274         }
 275         trace2_region_leave("send_pack", "receive_status", the_repository);
 276         return ret;
 277 }
 278
 279 static int sideband_demux(int in UNUSED, int out, void *data)
 280 {
 281         int *fd = data, ret;
 282         if (async_with_fork())
 283                 close(fd[1]);
 284         ret = recv_sideband("send-pack", fd[0], out);
 285         close(out);
 286         return ret;
 287 }
 288
 289 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 290 {
 291         struct strbuf *sb = cb;
 292         if (graft->nr_parent == -1)
 293                 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
 294         return 0;
 295 }
 296
 297 static void advertise_shallow_grafts_buf(struct strbuf *sb)
 298 {
 299         if (!is_repository_shallow(the_repository))
 300                 return;
 301         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 302 }
 303
 304 #define CHECK_REF_NO_PUSH -1
 305 #define CHECK_REF_STATUS_REJECTED -2
 306 #define CHECK_REF_UPTODATE -3
 307 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
 308 {
 309         if (!ref->peer_ref && !args->send_mirror)
 310                 return CHECK_REF_NO_PUSH;
 311
 312         /* Check for statuses set by set_ref_status_for_push() */
 313         switch (ref->status) {
 314         case REF_STATUS_REJECT_NONFASTFORWARD:
 315         case REF_STATUS_REJECT_ALREADY_EXISTS:
 316         case REF_STATUS_REJECT_FETCH_FIRST:
 317         case REF_STATUS_REJECT_NEEDS_FORCE:
 318         case REF_STATUS_REJECT_STALE:
 319         case REF_STATUS_REJECT_REMOTE_UPDATED:
 320         case REF_STATUS_REJECT_NODELETE:
 321                 return CHECK_REF_STATUS_REJECTED;
 322         case REF_STATUS_UPTODATE:
 323                 return CHECK_REF_UPTODATE;
 324
 325         default:
 326         case REF_STATUS_EXPECTING_REPORT:
 327                 /* already passed checks on the local side */
 328         case REF_STATUS_OK:
 329                 /* of course this is OK */
 330                 return 0;
 331         }
 332 }
 333
 334 /*
 335  * the beginning of the next line, or the end of buffer.
 336  *
 337  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 338  * convert many similar uses found by "git grep -A4 memchr".
 339  */
 340 static const char *next_line(const char *line, size_t len)
 341 {
 342         const char *nl = memchr(line, '\n', len);
 343         if (!nl)
 344                 return line + len; /* incomplete line */
 345         return nl + 1;
 346 }
 347
 348 static int generate_push_cert(struct strbuf *req_buf,
 349                               const struct ref *remote_refs,
 350                               struct send_pack_args *args,
 351                               const char *cap_string,
 352                               const char *push_cert_nonce)
 353 {
 354         const struct ref *ref;
 355         struct string_list_item *item;
 356         char *signing_key_id = get_signing_key_id();
 357         char *signing_key = get_signing_key();
 358         const char *cp, *np;
 359         struct strbuf cert = STRBUF_INIT;
 360         int update_seen = 0;
 361
 362         strbuf_addstr(&cert, "certificate version 0.1\n");
 363         strbuf_addf(&cert, "pusher %s ", signing_key_id);
 364         datestamp(&cert);
 365         strbuf_addch(&cert, '\n');
 366         if (args->url && *args->url) {
 367                 char *anon_url = transport_anonymize_url(args->url);
 368                 strbuf_addf(&cert, "pushee %s\n", anon_url);
 369                 free(anon_url);
 370         }
 371         if (push_cert_nonce[0])
 372                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
 373         if (args->push_options)
 374                 for_each_string_list_item(item, args->push_options)
 375                         strbuf_addf(&cert, "push-option %s\n", item->string);
 376         strbuf_addstr(&cert, "\n");
 377
 378         for (ref = remote_refs; ref; ref = ref->next) {
 379                 if (check_to_send_update(ref, args) < 0)
 380                         continue;
 381                 update_seen = 1;
 382                 strbuf_addf(&cert, "%s %s %s\n",
 383                             oid_to_hex(&ref->old_oid),
 384                             oid_to_hex(&ref->new_oid),
 385                             ref->name);
 386         }
 387         if (!update_seen)
 388                 goto free_return;
 389
 390         if (sign_buffer(&cert, &cert, signing_key))
 391                 die(_("failed to sign the push certificate"));
 392
 393         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 394         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 395                 np = next_line(cp, cert.buf + cert.len - cp);
 396                 packet_buf_write(req_buf,
 397                                  "%.*s", (int)(np - cp), cp);
 398         }
 399         packet_buf_write(req_buf, "push-cert-end\n");
 400
 401 free_return:
 402         free(signing_key_id);
 403         free(signing_key);
 404         strbuf_release(&cert);
 405         return update_seen;
 406 }
 407
 408 #define NONCE_LEN_LIMIT 256
 409
 410 static void reject_invalid_nonce(const char *nonce, int len)
 411 {
 412         int i = 0;
 413
 414         if (NONCE_LEN_LIMIT <= len)
 415                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 416                     len, nonce);
 417
 418         for (i = 0; i < len; i++) {
 419                 int ch = nonce[i] & 0xFF;
 420                 if (isalnum(ch) ||
 421                     ch == '-' || ch == '.' ||
 422                     ch == '/' || ch == '+' ||
 423                     ch == '=' || ch == '_')
 424                         continue;
 425                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 426                     len, nonce);
 427         }
 428 }
 429
 430 static void get_commons_through_negotiation(const char *url,
 431                                             const struct ref *remote_refs,
 432                                             struct oid_array *commons)
 433 {
 434         struct child_process child = CHILD_PROCESS_INIT;
 435         const struct ref *ref;
 436         int len = the_hash_algo->hexsz + 1; /* hash + NL */
 437         int nr_negotiation_tip = 0;
 438
 439         child.git_cmd = 1;
 440         child.no_stdin = 1;
 441         child.out = -1;
 442         strvec_pushl(&child.args, "fetch", "--negotiate-only", NULL);
 443         for (ref = remote_refs; ref; ref = ref->next) {
 444                 if (!is_null_oid(&ref->new_oid)) {
 445                         strvec_pushf(&child.args, "--negotiation-tip=%s",
 446                                      oid_to_hex(&ref->new_oid));
 447                         nr_negotiation_tip++;
 448                 }
 449         }
 450         strvec_push(&child.args, url);
 451
 452         if (!nr_negotiation_tip) {
 453                 child_process_clear(&child);
 454                 return;
 455         }
 456
 457         if (start_command(&child))
 458                 die(_("send-pack: unable to fork off fetch subprocess"));
 459
 460         do {
 461                 char hex_hash[GIT_MAX_HEXSZ + 1];
 462                 int read_len = read_in_full(child.out, hex_hash, len);
 463                 struct object_id oid;
 464                 const char *end;
 465
 466                 if (!read_len)
 467                         break;
 468                 if (read_len != len)
 469                         die("invalid length read %d", read_len);
 470                 if (parse_oid_hex(hex_hash, &oid, &end) || *end != '\n')
 471                         die("invalid hash");
 472                 oid_array_append(commons, &oid);
 473         } while (1);
 474
 475         if (finish_command(&child)) {
 476                 /*
 477                  * The information that push negotiation provides is useful but
 478                  * not mandatory.
 479                  */
 480                 warning(_("push negotiation failed; proceeding anyway with push"));
 481         }
 482 }
 483
 484 int send_pack(struct send_pack_args *args,
 485               int fd[], struct child_process *conn,
 486               struct ref *remote_refs,
 487               struct oid_array *extra_have)
 488 {
 489         struct oid_array commons = OID_ARRAY_INIT;
 490         int in = fd[0];
 491         int out = fd[1];
 492         struct strbuf req_buf = STRBUF_INIT;
 493         struct strbuf cap_buf = STRBUF_INIT;
 494         struct ref *ref;
 495         int need_pack_data = 0;
 496         int allow_deleting_refs = 0;
 497         int status_report = 0;
 498         int use_sideband = 0;
 499         int quiet_supported = 0;
 500         int agent_supported = 0;
 501         int advertise_sid = 0;
 502         int push_negotiate = 0;
 503         int use_atomic = 0;
 504         int atomic_supported = 0;
 505         int use_push_options = 0;
 506         int push_options_supported = 0;
 507         int object_format_supported = 0;
 508         unsigned cmds_sent = 0;
 509         int ret;
 510         struct async demux;
 511         char *push_cert_nonce = NULL;
 512         struct packet_reader reader;
 513         int use_bitmaps;
 514
 515         if (!remote_refs) {
 516                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 517                         "Perhaps you should specify a branch.\n");
 518                 ret = 0;
 519                 goto out;
 520         }
 521
 522         git_config_get_bool("push.negotiate", &push_negotiate);
 523         if (push_negotiate) {
 524                 trace2_region_enter("send_pack", "push_negotiate", the_repository);
 525                 get_commons_through_negotiation(args->url, remote_refs, &commons);
 526                 trace2_region_leave("send_pack", "push_negotiate", the_repository);
 527         }
 528
 529         if (!git_config_get_bool("push.usebitmaps", &use_bitmaps))
 530                 args->disable_bitmaps = !use_bitmaps;
 531
 532         git_config_get_bool("transfer.advertisesid", &advertise_sid);
 533
 534         /* Does the other end support the reporting? */
 535         if (server_supports("report-status-v2"))
 536                 status_report = 2;
 537         else if (server_supports("report-status"))
 538                 status_report = 1;
 539         if (server_supports("delete-refs"))
 540                 allow_deleting_refs = 1;
 541         if (server_supports("ofs-delta"))
 542                 args->use_ofs_delta = 1;
 543         if (server_supports("side-band-64k"))
 544                 use_sideband = 1;
 545         if (server_supports("quiet"))
 546                 quiet_supported = 1;
 547         if (server_supports("agent"))
 548                 agent_supported = 1;
 549         if (!server_supports("session-id"))
 550                 advertise_sid = 0;
 551         if (server_supports("no-thin"))
 552                 args->use_thin_pack = 0;
 553         if (server_supports("atomic"))
 554                 atomic_supported = 1;
 555         if (server_supports("push-options"))
 556                 push_options_supported = 1;
 557
 558         if (!server_supports_hash(the_hash_algo->name, &object_format_supported))
 559                 die(_("the receiving end does not support this repository's hash algorithm"));
 560
 561         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
 562                 size_t len;
 563                 const char *nonce = server_feature_value("push-cert", &len);
 564
 565                 if (nonce) {
 566                         reject_invalid_nonce(nonce, len);
 567                         push_cert_nonce = xmemdupz(nonce, len);
 568                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
 569                         die(_("the receiving end does not support --signed push"));
 570                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
 571                         warning(_("not sending a push certificate since the"
 572                                   " receiving end does not support --signed"
 573                                   " push"));
 574                 }
 575         }
 576
 577         if (args->atomic && !atomic_supported)
 578                 die(_("the receiving end does not support --atomic push"));
 579
 580         use_atomic = atomic_supported && args->atomic;
 581
 582         if (args->push_options && !push_options_supported)
 583                 die(_("the receiving end does not support push options"));
 584
 585         use_push_options = push_options_supported && args->push_options;
 586
 587         if (status_report == 1)
 588                 strbuf_addstr(&cap_buf, " report-status");
 589         else if (status_report == 2)
 590                 strbuf_addstr(&cap_buf, " report-status-v2");
 591         if (use_sideband)
 592                 strbuf_addstr(&cap_buf, " side-band-64k");
 593         if (quiet_supported && (args->quiet || !args->progress))
 594                 strbuf_addstr(&cap_buf, " quiet");
 595         if (use_atomic)
 596                 strbuf_addstr(&cap_buf, " atomic");
 597         if (use_push_options)
 598                 strbuf_addstr(&cap_buf, " push-options");
 599         if (object_format_supported)
 600                 strbuf_addf(&cap_buf, " object-format=%s", the_hash_algo->name);
 601         if (agent_supported)
 602                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 603         if (advertise_sid)
 604                 strbuf_addf(&cap_buf, " session-id=%s", trace2_session_id());
 605
 606         /*
 607          * NEEDSWORK: why does delete-refs have to be so specific to
 608          * send-pack machinery that set_ref_status_for_push() cannot
 609          * set this bit for us???
 610          */
 611         for (ref = remote_refs; ref; ref = ref->next)
 612                 if (ref->deletion && !allow_deleting_refs)
 613                         ref->status = REF_STATUS_REJECT_NODELETE;
 614
 615         /*
 616          * Clear the status for each ref and see if we need to send
 617          * the pack data.
 618          */
 619         for (ref = remote_refs; ref; ref = ref->next) {
 620                 switch (check_to_send_update(ref, args)) {
 621                 case 0: /* no error */
 622                         break;
 623                 case CHECK_REF_STATUS_REJECTED:
 624                         /*
 625                          * When we know the server would reject a ref update if
 626                          * we were to send it and we're trying to send the refs
 627                          * atomically, abort the whole operation.
 628                          */
 629                         if (use_atomic) {
 630                                 reject_atomic_push(remote_refs, args->send_mirror);
 631                                 error("atomic push failed for ref %s. status: %d",
 632                                       ref->name, ref->status);
 633                                 ret = args->porcelain ? 0 : -1;
 634                                 goto out;
 635                         }
 636                         /* else fallthrough */
 637                 default:
 638                         continue;
 639                 }
 640                 if (!ref->deletion)
 641                         need_pack_data = 1;
 642
 643                 if (args->dry_run || !status_report)
 644                         ref->status = REF_STATUS_OK;
 645                 else
 646                         ref->status = REF_STATUS_EXPECTING_REPORT;
 647         }
 648
 649         if (!args->dry_run)
 650                 advertise_shallow_grafts_buf(&req_buf);
 651
 652         /*
 653          * Finally, tell the other end!
 654          */
 655         if (!args->dry_run && push_cert_nonce) {
 656                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 657                                                cap_buf.buf, push_cert_nonce);
 658                 trace2_printf("Generated push certificate");
 659         } else if (!args->dry_run) {
 660                 for (ref = remote_refs; ref; ref = ref->next) {
 661                         char *old_hex, *new_hex;
 662
 663                         if (check_to_send_update(ref, args) < 0)
 664                                 continue;
 665
 666                         old_hex = oid_to_hex(&ref->old_oid);
 667                         new_hex = oid_to_hex(&ref->new_oid);
 668                         if (!cmds_sent) {
 669                                 packet_buf_write(&req_buf,
 670                                                  "%s %s %s%c%s",
 671                                                  old_hex, new_hex, ref->name, 0,
 672                                                  cap_buf.buf);
 673                                 cmds_sent = 1;
 674                         } else {
 675                                 packet_buf_write(&req_buf, "%s %s %s",
 676                                                  old_hex, new_hex, ref->name);
 677                         }
 678                 }
 679         }
 680
 681         if (use_push_options) {
 682                 struct string_list_item *item;
 683
 684                 packet_buf_flush(&req_buf);
 685                 for_each_string_list_item(item, args->push_options)
 686                         packet_buf_write(&req_buf, "%s", item->string);
 687         }
 688
 689         if (args->stateless_rpc) {
 690                 if (!args->dry_run && (cmds_sent || is_repository_shallow(the_repository))) {
 691                         packet_buf_flush(&req_buf);
 692                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 693                 }
 694         } else {
 695                 write_or_die(out, req_buf.buf, req_buf.len);
 696                 packet_flush(out);
 697         }
 698
 699         if (use_sideband && cmds_sent) {
 700                 memset(&demux, 0, sizeof(demux));
 701                 demux.proc = sideband_demux;
 702                 demux.data = fd;
 703                 demux.out = -1;
 704                 demux.isolate_sigpipe = 1;
 705                 if (start_async(&demux))
 706                         die("send-pack: unable to fork off sideband demultiplexer");
 707                 in = demux.out;
 708         }
 709
 710         packet_reader_init(&reader, in, NULL, 0,
 711                            PACKET_READ_CHOMP_NEWLINE |
 712                            PACKET_READ_DIE_ON_ERR_PACKET);
 713
 714         if (need_pack_data && cmds_sent) {
 715                 if (pack_objects(out, remote_refs, extra_have, &commons, args) < 0) {
 716                         if (args->stateless_rpc)
 717                                 close(out);
 718                         if (git_connection_is_socket(conn))
 719                                 shutdown(fd[0], SHUT_WR);
 720
 721                         /*
 722                          * Do not even bother with the return value; we know we
 723                          * are failing, and just want the error() side effects,
 724                          * as well as marking refs with their remote status (if
 725                          * we get one).
 726                          */
 727                         if (status_report)
 728                                 receive_status(&reader, remote_refs);
 729
 730                         if (use_sideband) {
 731                                 close(demux.out);
 732                                 finish_async(&demux);
 733                         }
 734                         fd[1] = -1;
 735
 736                         ret = -1;
 737                         goto out;
 738                 }
 739                 if (!args->stateless_rpc)
 740                         /* Closed by pack_objects() via start_command() */
 741                         fd[1] = -1;
 742         }
 743         if (args->stateless_rpc && cmds_sent)
 744                 packet_flush(out);
 745
 746         if (status_report && cmds_sent)
 747                 ret = receive_status(&reader, remote_refs);
 748         else
 749                 ret = 0;
 750         if (args->stateless_rpc)
 751                 packet_flush(out);
 752
 753         if (use_sideband && cmds_sent) {
 754                 close(demux.out);
 755                 if (finish_async(&demux)) {
 756                         error("error in sideband demultiplexer");
 757                         ret = -1;
 758                 }
 759         }
 760
 761         if (ret < 0)
 762                 goto out;
 763
 764         if (args->porcelain) {
 765                 ret = 0;
 766                 goto out;
 767         }
 768
 769         for (ref = remote_refs; ref; ref = ref->next) {
 770                 switch (ref->status) {
 771                 case REF_STATUS_NONE:
 772                 case REF_STATUS_UPTODATE:
 773                 case REF_STATUS_OK:
 774                         break;
 775                 default:
 776                         ret = -1;
 777                         goto out;
 778                 }
 779         }
 780
 781         ret = 0;
 782
 783 out:
 784         oid_array_clear(&commons);
 785         strbuf_release(&req_buf);
 786         strbuf_release(&cap_buf);
 787         free(push_cert_nonce);
 788         return ret;
 789 }