send-pack.c

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