builtin-send-pack.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "tag.h"
   4 #include "refs.h"
   5 #include "pkt-line.h"
   6 #include "run-command.h"
   7 #include "remote.h"
   8 #include "send-pack.h"
   9
  10 static const char send_pack_usage[] =
  11 "git-send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
  12 "  --all and explicit <ref> specification are mutually exclusive.";
  13
  14 static struct send_pack_args args = {
  15         /* .receivepack = */ "git-receive-pack",
  16 };
  17
  18 static struct additional_base {
  19         unsigned char tip[20];
  20         unsigned char last[20];
  21         struct commit *commit;
  22 } *unknown;
  23 static int unknown_nr;
  24 static int unknown_alloc;
  25
  26 /*
  27  * Make a pack stream and spit it out into file descriptor fd
  28  */
  29 static int pack_objects(int fd, struct ref *refs)
  30 {
  31         /*
  32          * The child becomes pack-objects --revs; we feed
  33          * the revision parameters to it via its stdin and
  34          * let its stdout go back to the other end.
  35          */
  36         const char *argv[] = {
  37                 "pack-objects",
  38                 "--all-progress",
  39                 "--revs",
  40                 "--stdout",
  41                 NULL,
  42                 NULL,
  43         };
  44         struct child_process po;
  45
  46         if (args.use_thin_pack)
  47                 argv[4] = "--thin";
  48         memset(&po, 0, sizeof(po));
  49         po.argv = argv;
  50         po.in = -1;
  51         po.out = fd;
  52         po.git_cmd = 1;
  53         if (start_command(&po))
  54                 die("git-pack-objects failed (%s)", strerror(errno));
  55
  56         /*
  57          * We feed the pack-objects we just spawned with revision
  58          * parameters by writing to the pipe.
  59          */
  60         while (refs) {
  61                 char buf[42];
  62
  63                 if (!is_null_sha1(refs->old_sha1) &&
  64                     has_sha1_file(refs->old_sha1)) {
  65                         memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
  66                         buf[0] = '^';
  67                         buf[41] = '\n';
  68                         if (!write_or_whine(po.in, buf, 42,
  69                                                 "send-pack: send refs"))
  70                                 break;
  71                 }
  72                 if (!is_null_sha1(refs->new_sha1)) {
  73                         memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
  74                         buf[40] = '\n';
  75                         if (!write_or_whine(po.in, buf, 41,
  76                                                 "send-pack: send refs"))
  77                                 break;
  78                 }
  79                 refs = refs->next;
  80         }
  81
  82         if (unknown) {
  83                 int i;
  84                 char buf[42];
  85
  86                 for (i = 0; i < unknown_nr; i++) {
  87                         struct commit *c = unknown[i].commit;
  88                         if (!c)
  89                                 continue;
  90                         memcpy(buf + 1, sha1_to_hex(c->object.sha1), 40);
  91                         buf[0] = '^';
  92                         buf[41] = '\n';
  93                         if (!write_or_whine(po.in, buf, 42,
  94                                             "send-pack: send additional base"))
  95                                 break;
  96                 }
  97         }
  98
  99         close(po.in);
 100         if (finish_command(&po))
 101                 return error("pack-objects died with strange error");
 102         return 0;
 103 }
 104
 105 static void unmark_and_free(struct commit_list *list, unsigned int mark)
 106 {
 107         while (list) {
 108                 struct commit_list *temp = list;
 109                 temp->item->object.flags &= ~mark;
 110                 list = temp->next;
 111                 free(temp);
 112         }
 113 }
 114
 115 static int ref_newer(const unsigned char *new_sha1,
 116                      const unsigned char *old_sha1)
 117 {
 118         struct object *o;
 119         struct commit *old, *new;
 120         struct commit_list *list, *used;
 121         int found = 0;
 122
 123         /* Both new and old must be commit-ish and new is descendant of
 124          * old.  Otherwise we require --force.
 125          */
 126         o = deref_tag(parse_object(old_sha1), NULL, 0);
 127         if (!o || o->type != OBJ_COMMIT)
 128                 return 0;
 129         old = (struct commit *) o;
 130
 131         o = deref_tag(parse_object(new_sha1), NULL, 0);
 132         if (!o || o->type != OBJ_COMMIT)
 133                 return 0;
 134         new = (struct commit *) o;
 135
 136         if (parse_commit(new) < 0)
 137                 return 0;
 138
 139         used = list = NULL;
 140         commit_list_insert(new, &list);
 141         while (list) {
 142                 new = pop_most_recent_commit(&list, 1);
 143                 commit_list_insert(new, &used);
 144                 if (new == old) {
 145                         found = 1;
 146                         break;
 147                 }
 148         }
 149         unmark_and_free(list, 1);
 150         unmark_and_free(used, 1);
 151         return found;
 152 }
 153
 154 static struct ref *local_refs, **local_tail;
 155 static struct ref *remote_refs, **remote_tail;
 156
 157 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 158 {
 159         struct ref *ref;
 160         int len = strlen(refname) + 1;
 161         ref = xcalloc(1, sizeof(*ref) + len);
 162         hashcpy(ref->new_sha1, sha1);
 163         memcpy(ref->name, refname, len);
 164         *local_tail = ref;
 165         local_tail = &ref->next;
 166         return 0;
 167 }
 168
 169 static void get_local_heads(void)
 170 {
 171         local_tail = &local_refs;
 172         for_each_ref(one_local_ref, NULL);
 173 }
 174
 175 static int receive_status(int in, struct ref *refs)
 176 {
 177         struct ref *hint;
 178         char line[1000];
 179         int ret = 0;
 180         int len = packet_read_line(in, line, sizeof(line));
 181         if (len < 10 || memcmp(line, "unpack ", 7))
 182                 return error("did not receive remote status");
 183         if (memcmp(line, "unpack ok\n", 10)) {
 184                 char *p = line + strlen(line) - 1;
 185                 if (*p == '\n')
 186                         *p = '\0';
 187                 error("unpack failed: %s", line + 7);
 188                 ret = -1;
 189         }
 190         hint = NULL;
 191         while (1) {
 192                 char *refname;
 193                 char *msg;
 194                 len = packet_read_line(in, line, sizeof(line));
 195                 if (!len)
 196                         break;
 197                 if (len < 3 ||
 198                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
 199                         fprintf(stderr, "protocol error: %s\n", line);
 200                         ret = -1;
 201                         break;
 202                 }
 203
 204                 line[strlen(line)-1] = '\0';
 205                 refname = line + 3;
 206                 msg = strchr(refname, ' ');
 207                 if (msg)
 208                         *msg++ = '\0';
 209
 210                 /* first try searching at our hint, falling back to all refs */
 211                 if (hint)
 212                         hint = find_ref_by_name(hint, refname);
 213                 if (!hint)
 214                         hint = find_ref_by_name(refs, refname);
 215                 if (!hint) {
 216                         warning("remote reported status on unknown ref: %s",
 217                                         refname);
 218                         continue;
 219                 }
 220                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 221                         warning("remote reported status on unexpected ref: %s",
 222                                         refname);
 223                         continue;
 224                 }
 225
 226                 if (line[0] == 'o' && line[1] == 'k')
 227                         hint->status = REF_STATUS_OK;
 228                 else {
 229                         hint->status = REF_STATUS_REMOTE_REJECT;
 230                         ret = -1;
 231                 }
 232                 if (msg)
 233                         hint->remote_status = xstrdup(msg);
 234                 /* start our next search from the next ref */
 235                 hint = hint->next;
 236         }
 237         return ret;
 238 }
 239
 240 static void update_tracking_ref(struct remote *remote, struct ref *ref)
 241 {
 242         struct refspec rs;
 243
 244         if (ref->status != REF_STATUS_OK)
 245                 return;
 246
 247         rs.src = ref->name;
 248         rs.dst = NULL;
 249
 250         if (!remote_find_tracking(remote, &rs)) {
 251                 if (args.verbose)
 252                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 253                 if (ref->deletion) {
 254                         if (delete_ref(rs.dst, NULL))
 255                                 error("Failed to delete");
 256                 } else
 257                         update_ref("update by push", rs.dst,
 258                                         ref->new_sha1, NULL, 0, 0);
 259                 free(rs.dst);
 260         }
 261 }
 262
 263 static const char *prettify_ref(const struct ref *ref)
 264 {
 265         const char *name = ref->name;
 266         return name + (
 267                 !prefixcmp(name, "refs/heads/") ? 11 :
 268                 !prefixcmp(name, "refs/tags/") ? 10 :
 269                 !prefixcmp(name, "refs/remotes/") ? 13 :
 270                 0);
 271 }
 272
 273 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 274
 275 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 276 {
 277         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 278         if (from)
 279                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 280         else
 281                 fputs(prettify_ref(to), stderr);
 282         if (msg) {
 283                 fputs(" (", stderr);
 284                 fputs(msg, stderr);
 285                 fputc(')', stderr);
 286         }
 287         fputc('\n', stderr);
 288 }
 289
 290 static const char *status_abbrev(unsigned char sha1[20])
 291 {
 292         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 293 }
 294
 295 static void print_ok_ref_status(struct ref *ref)
 296 {
 297         if (ref->deletion)
 298                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 299         else if (is_null_sha1(ref->old_sha1))
 300                 print_ref_status('*',
 301                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 302                           "[new branch]"),
 303                         ref, ref->peer_ref, NULL);
 304         else {
 305                 char quickref[84];
 306                 char type;
 307                 const char *msg;
 308
 309                 strcpy(quickref, status_abbrev(ref->old_sha1));
 310                 if (ref->nonfastforward) {
 311                         strcat(quickref, "...");
 312                         type = '+';
 313                         msg = "forced update";
 314                 } else {
 315                         strcat(quickref, "..");
 316                         type = ' ';
 317                         msg = NULL;
 318                 }
 319                 strcat(quickref, status_abbrev(ref->new_sha1));
 320
 321                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 322         }
 323 }
 324
 325 static int print_one_push_status(struct ref *ref, const char *dest, int count)
 326 {
 327         if (!count)
 328                 fprintf(stderr, "To %s\n", dest);
 329
 330         switch(ref->status) {
 331         case REF_STATUS_NONE:
 332                 print_ref_status('X', "[no match]", ref, NULL, NULL);
 333                 break;
 334         case REF_STATUS_REJECT_NODELETE:
 335                 print_ref_status('!', "[rejected]", ref, NULL,
 336                                 "remote does not support deleting refs");
 337                 break;
 338         case REF_STATUS_UPTODATE:
 339                 print_ref_status('=', "[up to date]", ref,
 340                                 ref->peer_ref, NULL);
 341                 break;
 342         case REF_STATUS_REJECT_NONFASTFORWARD:
 343                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 344                                 "non-fast forward");
 345                 break;
 346         case REF_STATUS_REMOTE_REJECT:
 347                 print_ref_status('!', "[remote rejected]", ref,
 348                                 ref->deletion ? NULL : ref->peer_ref,
 349                                 ref->remote_status);
 350                 break;
 351         case REF_STATUS_EXPECTING_REPORT:
 352                 print_ref_status('!', "[remote failure]", ref,
 353                                 ref->deletion ? NULL : ref->peer_ref,
 354                                 "remote failed to report status");
 355                 break;
 356         case REF_STATUS_OK:
 357                 print_ok_ref_status(ref);
 358                 break;
 359         }
 360
 361         return 1;
 362 }
 363
 364 static void print_push_status(const char *dest, struct ref *refs)
 365 {
 366         struct ref *ref;
 367         int n = 0;
 368
 369         if (args.verbose) {
 370                 for (ref = refs; ref; ref = ref->next)
 371                         if (ref->status == REF_STATUS_UPTODATE)
 372                                 n += print_one_push_status(ref, dest, n);
 373         }
 374
 375         for (ref = refs; ref; ref = ref->next)
 376                 if (ref->status == REF_STATUS_OK)
 377                         n += print_one_push_status(ref, dest, n);
 378
 379         for (ref = refs; ref; ref = ref->next) {
 380                 if (ref->status != REF_STATUS_NONE &&
 381                     ref->status != REF_STATUS_UPTODATE &&
 382                     ref->status != REF_STATUS_OK)
 383                         n += print_one_push_status(ref, dest, n);
 384         }
 385 }
 386
 387 static int refs_pushed(struct ref *ref)
 388 {
 389         for (; ref; ref = ref->next) {
 390                 switch(ref->status) {
 391                 case REF_STATUS_NONE:
 392                 case REF_STATUS_UPTODATE:
 393                         break;
 394                 default:
 395                         return 1;
 396                 }
 397         }
 398         return 0;
 399 }
 400
 401 static void ask_for_more(int in, int out, struct ref *remote_refs)
 402 {
 403         struct ref *refs;
 404         int i;
 405
 406         for (refs = remote_refs; refs; refs = refs->next) {
 407                 struct commit *commit;
 408
 409                 if (is_null_sha1(refs->old_sha1))
 410                         continue;
 411                 commit = lookup_commit_reference_gently(refs->old_sha1, 1);
 412                 if (!commit) {
 413                         ALLOC_GROW(unknown, unknown_nr+1, unknown_alloc);
 414                         hashcpy(unknown[unknown_nr].last, refs->old_sha1);
 415                         unknown[unknown_nr].commit = NULL;
 416                         unknown_nr++;
 417                 }
 418         }
 419         if (!unknown_nr) {
 420                 packet_flush(out);
 421                 return;
 422         }
 423
 424         for (i = 0; i < 5; i++) {
 425                 int j, sent = 0;
 426                 for (j = 0; j < unknown_nr; j++) {
 427                         if (unknown[j].commit)
 428                                 continue;
 429                         hashcpy(unknown[j].tip, unknown[j].last);
 430                         packet_write(out, "tellme-more %s\n",
 431                                      sha1_to_hex(unknown[j].tip));
 432                         sent++;
 433                 }
 434                 packet_flush(out);
 435                 if (!sent)
 436                         return;
 437                 sent = 0;
 438                 while (1) {
 439                         char line[1000];
 440                         unsigned char tip[20];
 441                         unsigned char last[20];
 442                         int len;
 443                         struct commit *commit;
 444
 445                         len = packet_read_line(in, line, sizeof(line));
 446                         if (!len)
 447                                 break;
 448                         sent++;
 449                         if (line[len-1] == '\n')
 450                                 line[--len] = '\0';
 451                         if (len < 81 ||
 452                             line[40] != ' ' ||
 453                             get_sha1_hex(line, last) ||
 454                             get_sha1_hex(line + 41, tip))
 455                                 die("protocol error: got '%s'", line);
 456                         for (j = 0; j < unknown_nr; j++) {
 457                                 if (unknown[j].commit ||
 458                                     hashcmp(unknown[j].tip, tip))
 459                                         continue;
 460                                 hashcpy(unknown[j].last, last);
 461                                 commit = lookup_commit_reference_gently(last, 1);
 462                                 if (!commit)
 463                                         continue;
 464                                 unknown[j].commit = commit;
 465                         }
 466                 }
 467                 if (!sent)
 468                         /* they do not have any more to tell us */
 469                         break;
 470         }
 471         packet_flush(out);
 472 }
 473
 474 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 475 {
 476         struct ref *ref;
 477         int new_refs;
 478         int ask_for_status_report = 0;
 479         int allow_deleting_refs = 0;
 480         int expect_status_report = 0;
 481         int can_ask_for_more = 0;
 482         int flags = MATCH_REFS_NONE;
 483         int ret;
 484
 485         if (args.send_all)
 486                 flags |= MATCH_REFS_ALL;
 487         if (args.send_mirror)
 488                 flags |= MATCH_REFS_MIRROR;
 489
 490         /* No funny business with the matcher */
 491         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 492         get_local_heads();
 493
 494         /* Does the other end support the reporting? */
 495         if (server_supports("report-status"))
 496                 ask_for_status_report = 1;
 497         if (server_supports("delete-refs"))
 498                 allow_deleting_refs = 1;
 499         if (server_supports("tellme-more"))
 500                 can_ask_for_more = 1;
 501
 502         /* match them up */
 503         if (!remote_tail)
 504                 remote_tail = &remote_refs;
 505         if (match_refs(local_refs, remote_refs, &remote_tail,
 506                        nr_refspec, refspec, flags)) {
 507                 close(out);
 508                 return -1;
 509         }
 510
 511         if (!remote_refs) {
 512                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 513                         "Perhaps you should specify a branch such as 'master'.\n");
 514                 close(out);
 515                 return 0;
 516         }
 517
 518         /*
 519          * Finally, tell the other end!
 520          */
 521         new_refs = 0;
 522         for (ref = remote_refs; ref; ref = ref->next) {
 523                 const unsigned char *new_sha1;
 524
 525                 if (!ref->peer_ref) {
 526                         if (!args.send_mirror)
 527                                 continue;
 528                         new_sha1 = null_sha1;
 529                 }
 530                 else
 531                         new_sha1 = ref->peer_ref->new_sha1;
 532
 533
 534                 ref->deletion = is_null_sha1(new_sha1);
 535                 if (ref->deletion && !allow_deleting_refs) {
 536                         ref->status = REF_STATUS_REJECT_NODELETE;
 537                         continue;
 538                 }
 539                 if (!ref->deletion &&
 540                     !hashcmp(ref->old_sha1, new_sha1)) {
 541                         ref->status = REF_STATUS_UPTODATE;
 542                         continue;
 543                 }
 544
 545                 /* This part determines what can overwrite what.
 546                  * The rules are:
 547                  *
 548                  * (0) you can always use --force or +A:B notation to
 549                  *     selectively force individual ref pairs.
 550                  *
 551                  * (1) if the old thing does not exist, it is OK.
 552                  *
 553                  * (2) if you do not have the old thing, you are not allowed
 554                  *     to overwrite it; you would not know what you are losing
 555                  *     otherwise.
 556                  *
 557                  * (3) if both new and old are commit-ish, and new is a
 558                  *     descendant of old, it is OK.
 559                  *
 560                  * (4) regardless of all of the above, removing :B is
 561                  *     always allowed.
 562                  */
 563
 564                 ref->nonfastforward =
 565                     !ref->deletion &&
 566                     !is_null_sha1(ref->old_sha1) &&
 567                     (!has_sha1_file(ref->old_sha1)
 568                       || !ref_newer(new_sha1, ref->old_sha1));
 569
 570                 if (ref->nonfastforward && !ref->force && !args.force_update) {
 571                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 572                         continue;
 573                 }
 574
 575                 hashcpy(ref->new_sha1, new_sha1);
 576                 if (!ref->deletion)
 577                         new_refs++;
 578
 579                 if (!args.dry_run) {
 580                         char *old_hex = sha1_to_hex(ref->old_sha1);
 581                         char *new_hex = sha1_to_hex(ref->new_sha1);
 582
 583                         if (ask_for_status_report) {
 584                                 packet_write(out, "%s %s %s%c%s",
 585                                         old_hex, new_hex, ref->name, 0,
 586                                         "report-status");
 587                                 ask_for_status_report = 0;
 588                                 expect_status_report = 1;
 589                         }
 590                         else
 591                                 packet_write(out, "%s %s %s",
 592                                         old_hex, new_hex, ref->name);
 593                 }
 594                 ref->status = expect_status_report ?
 595                         REF_STATUS_EXPECTING_REPORT :
 596                         REF_STATUS_OK;
 597         }
 598
 599         if (can_ask_for_more && new_refs)
 600                 ask_for_more(in, out, remote_refs);
 601         else
 602                 packet_flush(out);
 603
 604         if (new_refs && !args.dry_run) {
 605                 if (pack_objects(out, remote_refs) < 0)
 606                         return -1;
 607         }
 608         else
 609                 close(out);
 610
 611         if (expect_status_report)
 612                 ret = receive_status(in, remote_refs);
 613         else
 614                 ret = 0;
 615
 616         print_push_status(dest, remote_refs);
 617
 618         if (!args.dry_run && remote) {
 619                 for (ref = remote_refs; ref; ref = ref->next)
 620                         update_tracking_ref(remote, ref);
 621         }
 622
 623         if (!refs_pushed(remote_refs))
 624                 fprintf(stderr, "Everything up-to-date\n");
 625         if (ret < 0)
 626                 return ret;
 627         for (ref = remote_refs; ref; ref = ref->next) {
 628                 switch (ref->status) {
 629                 case REF_STATUS_NONE:
 630                 case REF_STATUS_UPTODATE:
 631                 case REF_STATUS_OK:
 632                         break;
 633                 default:
 634                         return -1;
 635                 }
 636         }
 637         return 0;
 638 }
 639
 640 static void verify_remote_names(int nr_heads, const char **heads)
 641 {
 642         int i;
 643
 644         for (i = 0; i < nr_heads; i++) {
 645                 const char *local = heads[i];
 646                 const char *remote = strrchr(heads[i], ':');
 647
 648                 if (*local == '+')
 649                         local++;
 650
 651                 /* A matching refspec is okay.  */
 652                 if (remote == local && remote[1] == '\0')
 653                         continue;
 654
 655                 remote = remote ? (remote + 1) : local;
 656                 switch (check_ref_format(remote)) {
 657                 case 0: /* ok */
 658                 case CHECK_REF_FORMAT_ONELEVEL:
 659                         /* ok but a single level -- that is fine for
 660                          * a match pattern.
 661                          */
 662                 case CHECK_REF_FORMAT_WILDCARD:
 663                         /* ok but ends with a pattern-match character */
 664                         continue;
 665                 }
 666                 die("remote part of refspec is not a valid name in %s",
 667                     heads[i]);
 668         }
 669 }
 670
 671 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 672 {
 673         int i, nr_heads = 0;
 674         const char **heads = NULL;
 675         const char *remote_name = NULL;
 676         struct remote *remote = NULL;
 677         const char *dest = NULL;
 678
 679         argv++;
 680         for (i = 1; i < argc; i++, argv++) {
 681                 const char *arg = *argv;
 682
 683                 if (*arg == '-') {
 684                         if (!prefixcmp(arg, "--receive-pack=")) {
 685                                 args.receivepack = arg + 15;
 686                                 continue;
 687                         }
 688                         if (!prefixcmp(arg, "--exec=")) {
 689                                 args.receivepack = arg + 7;
 690                                 continue;
 691                         }
 692                         if (!prefixcmp(arg, "--remote=")) {
 693                                 remote_name = arg + 9;
 694                                 continue;
 695                         }
 696                         if (!strcmp(arg, "--all")) {
 697                                 args.send_all = 1;
 698                                 continue;
 699                         }
 700                         if (!strcmp(arg, "--dry-run")) {
 701                                 args.dry_run = 1;
 702                                 continue;
 703                         }
 704                         if (!strcmp(arg, "--mirror")) {
 705                                 args.send_mirror = 1;
 706                                 continue;
 707                         }
 708                         if (!strcmp(arg, "--force")) {
 709                                 args.force_update = 1;
 710                                 continue;
 711                         }
 712                         if (!strcmp(arg, "--verbose")) {
 713                                 args.verbose = 1;
 714                                 continue;
 715                         }
 716                         if (!strcmp(arg, "--thin")) {
 717                                 args.use_thin_pack = 1;
 718                                 continue;
 719                         }
 720                         usage(send_pack_usage);
 721                 }
 722                 if (!dest) {
 723                         dest = arg;
 724                         continue;
 725                 }
 726                 heads = (const char **) argv;
 727                 nr_heads = argc - i;
 728                 break;
 729         }
 730         if (!dest)
 731                 usage(send_pack_usage);
 732         /*
 733          * --all and --mirror are incompatible; neither makes sense
 734          * with any refspecs.
 735          */
 736         if ((heads && (args.send_all || args.send_mirror)) ||
 737                                         (args.send_all && args.send_mirror))
 738                 usage(send_pack_usage);
 739
 740         if (remote_name) {
 741                 remote = remote_get(remote_name);
 742                 if (!remote_has_url(remote, dest)) {
 743                         die("Destination %s is not a uri for %s",
 744                             dest, remote_name);
 745                 }
 746         }
 747
 748         return send_pack(&args, dest, remote, nr_heads, heads);
 749 }
 750
 751 int send_pack(struct send_pack_args *my_args,
 752               const char *dest, struct remote *remote,
 753               int nr_heads, const char **heads)
 754 {
 755         int fd[2], ret;
 756         struct child_process *conn;
 757
 758         memcpy(&args, my_args, sizeof(args));
 759
 760         verify_remote_names(nr_heads, heads);
 761
 762         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 763         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 764         close(fd[0]);
 765         /* do_send_pack always closes fd[1] */
 766         ret |= finish_connect(conn);
 767         return !!ret;
 768 }