send-pack.c

   1 #include "git-compat-util.h"
   2 #include "config.h"
   3 #include "commit.h"
   4 #include "date.h"
   5 #include "gettext.h"
   6 #include "hex.h"
   7 #include "refs.h"
   8 #include "object-store-ll.h"
   9 #include "pkt-line.h"
  10 #include "sideband.h"
  11 #include "run-command.h"
  12 #include "remote.h"
  13 #include "connect.h"
  14 #include "send-pack.h"
  15 #include "quote.h"
  16 #include "transport.h"
  17 #include "version.h"
  18 #include "wrapper.h"
  19 #include "oid-array.h"
  20 #include "gpg-interface.h"
  21 #include "shallow.h"
  22 #include "parse-options.h"
  23 #include "trace2.h"
  24 #include "write-or-die.h"
  25
  26 int option_parse_push_signed(const struct option *opt,
  27                              const char *arg, int unset)
  28 {
  29         if (unset) {
  30                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
  31                 return 0;
  32         }
  33         switch (git_parse_maybe_bool(arg)) {
  34         case 1:
  35                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
  36                 return 0;
  37         case 0:
  38                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
  39                 return 0;
  40         }
  41         if (!strcasecmp("if-asked", arg)) {
  42                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
  43                 return 0;
  44         }
  45         die("bad %s argument: %s", opt->long_name, arg);
  46 }
  47
  48 static void feed_object(const struct object_id *oid, FILE *fh, int negative)
  49 {
  50         if (negative &&
  51             !repo_has_object_file_with_flags(the_repository, oid,
  52                                              OBJECT_INFO_SKIP_FETCH_OBJECT |
  53                                              OBJECT_INFO_QUICK))
  54                 return;
  55
  56         if (negative)
  57                 putc('^', fh);
  58         fputs(oid_to_hex(oid), fh);
  59         putc('\n', fh);
  60 }
  61
  62 /*
  63  * Make a pack stream and spit it out into file descriptor fd
  64  */
  65 static int pack_objects(int fd, struct ref *refs, struct oid_array *advertised,
  66                         struct oid_array *negotiated,
  67                         struct send_pack_args *args)
  68 {
  69         /*
  70          * The child becomes pack-objects --revs; we feed
  71          * the revision parameters to it via its stdin and
  72          * let its stdout go back to the other end.
  73          */
  74         struct child_process po = CHILD_PROCESS_INIT;
  75         FILE *po_in;
  76         int i;
  77         int rc;
  78
  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                 return -1;
 151         }
 152         return 0;
 153 }
 154
 155 static int receive_unpack_status(struct packet_reader *reader)
 156 {
 157         if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 158                 return error(_("unexpected flush packet while reading remote unpack status"));
 159         if (!skip_prefix(reader->line, "unpack ", &reader->line))
 160                 return error(_("unable to parse remote unpack status: %s"), reader->line);
 161         if (strcmp(reader->line, "ok"))
 162                 return error(_("remote unpack failed: %s"), reader->line);
 163         return 0;
 164 }
 165
 166 static int receive_status(struct packet_reader *reader, struct ref *refs)
 167 {
 168         struct ref *hint;
 169         int ret;
 170         struct ref_push_report *report = NULL;
 171         int new_report = 0;
 172         int once = 0;
 173
 174         hint = NULL;
 175         ret = receive_unpack_status(reader);
 176         while (1) {
 177                 struct object_id old_oid, new_oid;
 178                 const char *head;
 179                 const char *refname;
 180                 char *p;
 181                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 182                         break;
 183                 head = reader->line;
 184                 p = strchr(head, ' ');
 185                 if (!p) {
 186                         error("invalid status line from remote: %s", reader->line);
 187                         ret = -1;
 188                         break;
 189                 }
 190                 *p++ = '\0';
 191
 192                 if (!strcmp(head, "option")) {
 193                         const char *key, *val;
 194
 195                         if (!hint || !(report || new_report)) {
 196                                 if (!once++)
 197                                         error("'option' without a matching 'ok/ng' directive");
 198                                 ret = -1;
 199                                 continue;
 200                         }
 201                         if (new_report) {
 202                                 if (!hint->report) {
 203                                         CALLOC_ARRAY(hint->report, 1);
 204                                         report = hint->report;
 205                                 } else {
 206                                         report = hint->report;
 207                                         while (report->next)
 208                                                 report = report->next;
 209                                         CALLOC_ARRAY(report->next, 1);
 210                                         report = report->next;
 211                                 }
 212                                 new_report = 0;
 213                         }
 214                         key = p;
 215                         p = strchr(key, ' ');
 216                         if (p)
 217                                 *p++ = '\0';
 218                         val = p;
 219                         if (!strcmp(key, "refname"))
 220                                 report->ref_name = xstrdup_or_null(val);
 221                         else if (!strcmp(key, "old-oid") && val &&
 222                                  !parse_oid_hex(val, &old_oid, &val))
 223                                 report->old_oid = oiddup(&old_oid);
 224                         else if (!strcmp(key, "new-oid") && val &&
 225                                  !parse_oid_hex(val, &new_oid, &val))
 226                                 report->new_oid = oiddup(&new_oid);
 227                         else if (!strcmp(key, "forced-update"))
 228                                 report->forced_update = 1;
 229                         continue;
 230                 }
 231
 232                 report = NULL;
 233                 new_report = 0;
 234                 if (strcmp(head, "ok") && strcmp(head, "ng")) {
 235                         error("invalid ref status from remote: %s", head);
 236                         ret = -1;
 237                         break;
 238                 }
 239                 refname = p;
 240                 p = strchr(refname, ' ');
 241                 if (p)
 242                         *p++ = '\0';
 243                 /* first try searching at our hint, falling back to all refs */
 244                 if (hint)
 245                         hint = find_ref_by_name(hint, refname);
 246                 if (!hint)
 247                         hint = find_ref_by_name(refs, refname);
 248                 if (!hint) {
 249                         warning("remote reported status on unknown ref: %s",
 250                                 refname);
 251                         continue;
 252                 }
 253                 if (hint->status != REF_STATUS_EXPECTING_REPORT &&
 254                     hint->status != REF_STATUS_OK &&
 255                     hint->status != REF_STATUS_REMOTE_REJECT) {
 256                         warning("remote reported status on unexpected ref: %s",
 257                                 refname);
 258                         continue;
 259                 }
 260                 if (!strcmp(head, "ng")) {
 261                         hint->status = REF_STATUS_REMOTE_REJECT;
 262                         if (p)
 263                                 hint->remote_status = xstrdup(p);
 264                         else
 265                                 hint->remote_status = "failed";
 266                 } else {
 267                         hint->status = REF_STATUS_OK;
 268                         hint->remote_status = xstrdup_or_null(p);
 269                         new_report = 1;
 270                 }
 271         }
 272         return ret;
 273 }
 274
 275 static int sideband_demux(int in UNUSED, int out, void *data)
 276 {
 277         int *fd = data, ret;
 278         if (async_with_fork())
 279                 close(fd[1]);
 280         ret = recv_sideband("send-pack", fd[0], out);
 281         close(out);
 282         return ret;
 283 }
 284
 285 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 286 {
 287         struct strbuf *sb = cb;
 288         if (graft->nr_parent == -1)
 289                 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
 290         return 0;
 291 }
 292
 293 static void advertise_shallow_grafts_buf(struct strbuf *sb)
 294 {
 295         if (!is_repository_shallow(the_repository))
 296                 return;
 297         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 298 }
 299
 300 #define CHECK_REF_NO_PUSH -1
 301 #define CHECK_REF_STATUS_REJECTED -2
 302 #define CHECK_REF_UPTODATE -3
 303 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
 304 {
 305         if (!ref->peer_ref && !args->send_mirror)
 306                 return CHECK_REF_NO_PUSH;
 307
 308         /* Check for statuses set by set_ref_status_for_push() */
 309         switch (ref->status) {
 310         case REF_STATUS_REJECT_NONFASTFORWARD:
 311         case REF_STATUS_REJECT_ALREADY_EXISTS:
 312         case REF_STATUS_REJECT_FETCH_FIRST:
 313         case REF_STATUS_REJECT_NEEDS_FORCE:
 314         case REF_STATUS_REJECT_STALE:
 315         case REF_STATUS_REJECT_REMOTE_UPDATED:
 316         case REF_STATUS_REJECT_NODELETE:
 317                 return CHECK_REF_STATUS_REJECTED;
 318         case REF_STATUS_UPTODATE:
 319                 return CHECK_REF_UPTODATE;
 320
 321         default:
 322         case REF_STATUS_EXPECTING_REPORT:
 323                 /* already passed checks on the local side */
 324         case REF_STATUS_OK:
 325                 /* of course this is OK */
 326                 return 0;
 327         }
 328 }
 329
 330 /*
 331  * the beginning of the next line, or the end of buffer.
 332  *
 333  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 334  * convert many similar uses found by "git grep -A4 memchr".
 335  */
 336 static const char *next_line(const char *line, size_t len)
 337 {
 338         const char *nl = memchr(line, '\n', len);
 339         if (!nl)
 340                 return line + len; /* incomplete line */
 341         return nl + 1;
 342 }
 343
 344 static int generate_push_cert(struct strbuf *req_buf,
 345                               const struct ref *remote_refs,
 346                               struct send_pack_args *args,
 347                               const char *cap_string,
 348                               const char *push_cert_nonce)
 349 {
 350         const struct ref *ref;
 351         struct string_list_item *item;
 352         char *signing_key_id = xstrdup(get_signing_key_id());
 353         const char *cp, *np;
 354         struct strbuf cert = STRBUF_INIT;
 355         int update_seen = 0;
 356
 357         strbuf_addstr(&cert, "certificate version 0.1\n");
 358         strbuf_addf(&cert, "pusher %s ", signing_key_id);
 359         datestamp(&cert);
 360         strbuf_addch(&cert, '\n');
 361         if (args->url && *args->url) {
 362                 char *anon_url = transport_anonymize_url(args->url);
 363                 strbuf_addf(&cert, "pushee %s\n", anon_url);
 364                 free(anon_url);
 365         }
 366         if (push_cert_nonce[0])
 367                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
 368         if (args->push_options)
 369                 for_each_string_list_item(item, args->push_options)
 370                         strbuf_addf(&cert, "push-option %s\n", item->string);
 371         strbuf_addstr(&cert, "\n");
 372
 373         for (ref = remote_refs; ref; ref = ref->next) {
 374                 if (check_to_send_update(ref, args) < 0)
 375                         continue;
 376                 update_seen = 1;
 377                 strbuf_addf(&cert, "%s %s %s\n",
 378                             oid_to_hex(&ref->old_oid),
 379                             oid_to_hex(&ref->new_oid),
 380                             ref->name);
 381         }
 382         if (!update_seen)
 383                 goto free_return;
 384
 385         if (sign_buffer(&cert, &cert, get_signing_key()))
 386                 die(_("failed to sign the push certificate"));
 387
 388         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 389         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 390                 np = next_line(cp, cert.buf + cert.len - cp);
 391                 packet_buf_write(req_buf,
 392                                  "%.*s", (int)(np - cp), cp);
 393         }
 394         packet_buf_write(req_buf, "push-cert-end\n");
 395
 396 free_return:
 397         free(signing_key_id);
 398         strbuf_release(&cert);
 399         return update_seen;
 400 }
 401
 402 #define NONCE_LEN_LIMIT 256
 403
 404 static void reject_invalid_nonce(const char *nonce, int len)
 405 {
 406         int i = 0;
 407
 408         if (NONCE_LEN_LIMIT <= len)
 409                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 410                     len, nonce);
 411
 412         for (i = 0; i < len; i++) {
 413                 int ch = nonce[i] & 0xFF;
 414                 if (isalnum(ch) ||
 415                     ch == '-' || ch == '.' ||
 416                     ch == '/' || ch == '+' ||
 417                     ch == '=' || ch == '_')
 418                         continue;
 419                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 420                     len, nonce);
 421         }
 422 }
 423
 424 static void get_commons_through_negotiation(const char *url,
 425                                             const struct ref *remote_refs,
 426                                             struct oid_array *commons)
 427 {
 428         struct child_process child = CHILD_PROCESS_INIT;
 429         const struct ref *ref;
 430         int len = the_hash_algo->hexsz + 1; /* hash + NL */
 431
 432         child.git_cmd = 1;
 433         child.no_stdin = 1;
 434         child.out = -1;
 435         strvec_pushl(&child.args, "fetch", "--negotiate-only", NULL);
 436         for (ref = remote_refs; ref; ref = ref->next) {
 437                 if (!is_null_oid(&ref->new_oid))
 438                         strvec_pushf(&child.args, "--negotiation-tip=%s", oid_to_hex(&ref->new_oid));
 439         }
 440         strvec_push(&child.args, url);
 441
 442         if (start_command(&child))
 443                 die(_("send-pack: unable to fork off fetch subprocess"));
 444
 445         do {
 446                 char hex_hash[GIT_MAX_HEXSZ + 1];
 447                 int read_len = read_in_full(child.out, hex_hash, len);
 448                 struct object_id oid;
 449                 const char *end;
 450
 451                 if (!read_len)
 452                         break;
 453                 if (read_len != len)
 454                         die("invalid length read %d", read_len);
 455                 if (parse_oid_hex(hex_hash, &oid, &end) || *end != '\n')
 456                         die("invalid hash");
 457                 oid_array_append(commons, &oid);
 458         } while (1);
 459
 460         if (finish_command(&child)) {
 461                 /*
 462                  * The information that push negotiation provides is useful but
 463                  * not mandatory.
 464                  */
 465                 warning(_("push negotiation failed; proceeding anyway with push"));
 466         }
 467 }
 468
 469 int send_pack(struct send_pack_args *args,
 470               int fd[], struct child_process *conn,
 471               struct ref *remote_refs,
 472               struct oid_array *extra_have)
 473 {
 474         struct oid_array commons = OID_ARRAY_INIT;
 475         int in = fd[0];
 476         int out = fd[1];
 477         struct strbuf req_buf = STRBUF_INIT;
 478         struct strbuf cap_buf = STRBUF_INIT;
 479         struct ref *ref;
 480         int need_pack_data = 0;
 481         int allow_deleting_refs = 0;
 482         int status_report = 0;
 483         int use_sideband = 0;
 484         int quiet_supported = 0;
 485         int agent_supported = 0;
 486         int advertise_sid = 0;
 487         int push_negotiate = 0;
 488         int use_atomic = 0;
 489         int atomic_supported = 0;
 490         int use_push_options = 0;
 491         int push_options_supported = 0;
 492         int object_format_supported = 0;
 493         unsigned cmds_sent = 0;
 494         int ret;
 495         struct async demux;
 496         const char *push_cert_nonce = NULL;
 497         struct packet_reader reader;
 498         int use_bitmaps;
 499
 500         if (!remote_refs) {
 501                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 502                         "Perhaps you should specify a branch.\n");
 503                 return 0;
 504         }
 505
 506         git_config_get_bool("push.negotiate", &push_negotiate);
 507         if (push_negotiate)
 508                 get_commons_through_negotiation(args->url, remote_refs, &commons);
 509
 510         if (!git_config_get_bool("push.usebitmaps", &use_bitmaps))
 511                 args->disable_bitmaps = !use_bitmaps;
 512
 513         git_config_get_bool("transfer.advertisesid", &advertise_sid);
 514
 515         /* Does the other end support the reporting? */
 516         if (server_supports("report-status-v2"))
 517                 status_report = 2;
 518         else if (server_supports("report-status"))
 519                 status_report = 1;
 520         if (server_supports("delete-refs"))
 521                 allow_deleting_refs = 1;
 522         if (server_supports("ofs-delta"))
 523                 args->use_ofs_delta = 1;
 524         if (server_supports("side-band-64k"))
 525                 use_sideband = 1;
 526         if (server_supports("quiet"))
 527                 quiet_supported = 1;
 528         if (server_supports("agent"))
 529                 agent_supported = 1;
 530         if (!server_supports("session-id"))
 531                 advertise_sid = 0;
 532         if (server_supports("no-thin"))
 533                 args->use_thin_pack = 0;
 534         if (server_supports("atomic"))
 535                 atomic_supported = 1;
 536         if (server_supports("push-options"))
 537                 push_options_supported = 1;
 538
 539         if (!server_supports_hash(the_hash_algo->name, &object_format_supported))
 540                 die(_("the receiving end does not support this repository's hash algorithm"));
 541
 542         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
 543                 size_t len;
 544                 push_cert_nonce = server_feature_value("push-cert", &len);
 545                 if (push_cert_nonce) {
 546                         reject_invalid_nonce(push_cert_nonce, len);
 547                         push_cert_nonce = xmemdupz(push_cert_nonce, len);
 548                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
 549                         die(_("the receiving end does not support --signed push"));
 550                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
 551                         warning(_("not sending a push certificate since the"
 552                                   " receiving end does not support --signed"
 553                                   " push"));
 554                 }
 555         }
 556
 557         if (args->atomic && !atomic_supported)
 558                 die(_("the receiving end does not support --atomic push"));
 559
 560         use_atomic = atomic_supported && args->atomic;
 561
 562         if (args->push_options && !push_options_supported)
 563                 die(_("the receiving end does not support push options"));
 564
 565         use_push_options = push_options_supported && args->push_options;
 566
 567         if (status_report == 1)
 568                 strbuf_addstr(&cap_buf, " report-status");
 569         else if (status_report == 2)
 570                 strbuf_addstr(&cap_buf, " report-status-v2");
 571         if (use_sideband)
 572                 strbuf_addstr(&cap_buf, " side-band-64k");
 573         if (quiet_supported && (args->quiet || !args->progress))
 574                 strbuf_addstr(&cap_buf, " quiet");
 575         if (use_atomic)
 576                 strbuf_addstr(&cap_buf, " atomic");
 577         if (use_push_options)
 578                 strbuf_addstr(&cap_buf, " push-options");
 579         if (object_format_supported)
 580                 strbuf_addf(&cap_buf, " object-format=%s", the_hash_algo->name);
 581         if (agent_supported)
 582                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 583         if (advertise_sid)
 584                 strbuf_addf(&cap_buf, " session-id=%s", trace2_session_id());
 585
 586         /*
 587          * NEEDSWORK: why does delete-refs have to be so specific to
 588          * send-pack machinery that set_ref_status_for_push() cannot
 589          * set this bit for us???
 590          */
 591         for (ref = remote_refs; ref; ref = ref->next)
 592                 if (ref->deletion && !allow_deleting_refs)
 593                         ref->status = REF_STATUS_REJECT_NODELETE;
 594
 595         /*
 596          * Clear the status for each ref and see if we need to send
 597          * the pack data.
 598          */
 599         for (ref = remote_refs; ref; ref = ref->next) {
 600                 switch (check_to_send_update(ref, args)) {
 601                 case 0: /* no error */
 602                         break;
 603                 case CHECK_REF_STATUS_REJECTED:
 604                         /*
 605                          * When we know the server would reject a ref update if
 606                          * we were to send it and we're trying to send the refs
 607                          * atomically, abort the whole operation.
 608                          */
 609                         if (use_atomic) {
 610                                 strbuf_release(&req_buf);
 611                                 strbuf_release(&cap_buf);
 612                                 reject_atomic_push(remote_refs, args->send_mirror);
 613                                 error("atomic push failed for ref %s. status: %d\n",
 614                                       ref->name, ref->status);
 615                                 return args->porcelain ? 0 : -1;
 616                         }
 617                         /* else fallthrough */
 618                 default:
 619                         continue;
 620                 }
 621                 if (!ref->deletion)
 622                         need_pack_data = 1;
 623
 624                 if (args->dry_run || !status_report)
 625                         ref->status = REF_STATUS_OK;
 626                 else
 627                         ref->status = REF_STATUS_EXPECTING_REPORT;
 628         }
 629
 630         if (!args->dry_run)
 631                 advertise_shallow_grafts_buf(&req_buf);
 632
 633         /*
 634          * Finally, tell the other end!
 635          */
 636         if (!args->dry_run && push_cert_nonce)
 637                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 638                                                cap_buf.buf, push_cert_nonce);
 639         else if (!args->dry_run)
 640                 for (ref = remote_refs; ref; ref = ref->next) {
 641                         char *old_hex, *new_hex;
 642
 643                         if (check_to_send_update(ref, args) < 0)
 644                                 continue;
 645
 646                         old_hex = oid_to_hex(&ref->old_oid);
 647                         new_hex = oid_to_hex(&ref->new_oid);
 648                         if (!cmds_sent) {
 649                                 packet_buf_write(&req_buf,
 650                                                  "%s %s %s%c%s",
 651                                                  old_hex, new_hex, ref->name, 0,
 652                                                  cap_buf.buf);
 653                                 cmds_sent = 1;
 654                         } else {
 655                                 packet_buf_write(&req_buf, "%s %s %s",
 656                                                  old_hex, new_hex, ref->name);
 657                         }
 658                 }
 659
 660         if (use_push_options) {
 661                 struct string_list_item *item;
 662
 663                 packet_buf_flush(&req_buf);
 664                 for_each_string_list_item(item, args->push_options)
 665                         packet_buf_write(&req_buf, "%s", item->string);
 666         }
 667
 668         if (args->stateless_rpc) {
 669                 if (!args->dry_run && (cmds_sent || is_repository_shallow(the_repository))) {
 670                         packet_buf_flush(&req_buf);
 671                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 672                 }
 673         } else {
 674                 write_or_die(out, req_buf.buf, req_buf.len);
 675                 packet_flush(out);
 676         }
 677         strbuf_release(&req_buf);
 678         strbuf_release(&cap_buf);
 679
 680         if (use_sideband && cmds_sent) {
 681                 memset(&demux, 0, sizeof(demux));
 682                 demux.proc = sideband_demux;
 683                 demux.data = fd;
 684                 demux.out = -1;
 685                 demux.isolate_sigpipe = 1;
 686                 if (start_async(&demux))
 687                         die("send-pack: unable to fork off sideband demultiplexer");
 688                 in = demux.out;
 689         }
 690
 691         packet_reader_init(&reader, in, NULL, 0,
 692                            PACKET_READ_CHOMP_NEWLINE |
 693                            PACKET_READ_DIE_ON_ERR_PACKET);
 694
 695         if (need_pack_data && cmds_sent) {
 696                 if (pack_objects(out, remote_refs, extra_have, &commons, args) < 0) {
 697                         if (args->stateless_rpc)
 698                                 close(out);
 699                         if (git_connection_is_socket(conn))
 700                                 shutdown(fd[0], SHUT_WR);
 701
 702                         /*
 703                          * Do not even bother with the return value; we know we
 704                          * are failing, and just want the error() side effects,
 705                          * as well as marking refs with their remote status (if
 706                          * we get one).
 707                          */
 708                         if (status_report)
 709                                 receive_status(&reader, remote_refs);
 710
 711                         if (use_sideband) {
 712                                 close(demux.out);
 713                                 finish_async(&demux);
 714                         }
 715                         fd[1] = -1;
 716                         return -1;
 717                 }
 718                 if (!args->stateless_rpc)
 719                         /* Closed by pack_objects() via start_command() */
 720                         fd[1] = -1;
 721         }
 722         if (args->stateless_rpc && cmds_sent)
 723                 packet_flush(out);
 724
 725         if (status_report && cmds_sent)
 726                 ret = receive_status(&reader, remote_refs);
 727         else
 728                 ret = 0;
 729         if (args->stateless_rpc)
 730                 packet_flush(out);
 731
 732         if (use_sideband && cmds_sent) {
 733                 close(demux.out);
 734                 if (finish_async(&demux)) {
 735                         error("error in sideband demultiplexer");
 736                         ret = -1;
 737                 }
 738         }
 739
 740         if (ret < 0)
 741                 return ret;
 742
 743         if (args->porcelain)
 744                 return 0;
 745
 746         for (ref = remote_refs; ref; ref = ref->next) {
 747                 switch (ref->status) {
 748                 case REF_STATUS_NONE:
 749                 case REF_STATUS_UPTODATE:
 750                 case REF_STATUS_OK:
 751                         break;
 752                 default:
 753                         return -1;
 754                 }
 755         }
 756         return 0;
 757 }