git.oblomov.eu Git - git/blob - builtin-receive-pack.c

   1 #include "cache.h"
   2 #include "pack.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "run-command.h"
   7 #include "exec_cmd.h"
   8 #include "commit.h"
   9 #include "object.h"
  10 #include "remote.h"
  11 #include "transport.h"
  12
  13 static const char receive_pack_usage[] = "git receive-pack <git-dir>";
  14
  15 enum deny_action {
  16         DENY_UNCONFIGURED,
  17         DENY_IGNORE,
  18         DENY_WARN,
  19         DENY_REFUSE,
  20 };
  21
  22 static int deny_deletes;
  23 static int deny_non_fast_forwards;
  24 static enum deny_action deny_current_branch = DENY_UNCONFIGURED;
  25 static enum deny_action deny_delete_current = DENY_UNCONFIGURED;
  26 static int receive_fsck_objects;
  27 static int receive_unpack_limit = -1;
  28 static int transfer_unpack_limit = -1;
  29 static int unpack_limit = 100;
  30 static int report_status;
  31 static int use_sideband;
  32 static int prefer_ofs_delta = 1;
  33 static int auto_update_server_info;
  34 static int auto_gc = 1;
  35 static const char *head_name;
  36 static int sent_capabilities;
  37
  38 static enum deny_action parse_deny_action(const char *var, const char *value)
  39 {
  40         if (value) {
  41                 if (!strcasecmp(value, "ignore"))
  42                         return DENY_IGNORE;
  43                 if (!strcasecmp(value, "warn"))
  44                         return DENY_WARN;
  45                 if (!strcasecmp(value, "refuse"))
  46                         return DENY_REFUSE;
  47         }
  48         if (git_config_bool(var, value))
  49                 return DENY_REFUSE;
  50         return DENY_IGNORE;
  51 }
  52
  53 static int receive_pack_config(const char *var, const char *value, void *cb)
  54 {
  55         if (strcmp(var, "receive.denydeletes") == 0) {
  56                 deny_deletes = git_config_bool(var, value);
  57                 return 0;
  58         }
  59
  60         if (strcmp(var, "receive.denynonfastforwards") == 0) {
  61                 deny_non_fast_forwards = git_config_bool(var, value);
  62                 return 0;
  63         }
  64
  65         if (strcmp(var, "receive.unpacklimit") == 0) {
  66                 receive_unpack_limit = git_config_int(var, value);
  67                 return 0;
  68         }
  69
  70         if (strcmp(var, "transfer.unpacklimit") == 0) {
  71                 transfer_unpack_limit = git_config_int(var, value);
  72                 return 0;
  73         }
  74
  75         if (strcmp(var, "receive.fsckobjects") == 0) {
  76                 receive_fsck_objects = git_config_bool(var, value);
  77                 return 0;
  78         }
  79
  80         if (!strcmp(var, "receive.denycurrentbranch")) {
  81                 deny_current_branch = parse_deny_action(var, value);
  82                 return 0;
  83         }
  84
  85         if (strcmp(var, "receive.denydeletecurrent") == 0) {
  86                 deny_delete_current = parse_deny_action(var, value);
  87                 return 0;
  88         }
  89
  90         if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
  91                 prefer_ofs_delta = git_config_bool(var, value);
  92                 return 0;
  93         }
  94
  95         if (strcmp(var, "receive.updateserverinfo") == 0) {
  96                 auto_update_server_info = git_config_bool(var, value);
  97                 return 0;
  98         }
  99
 100         if (strcmp(var, "receive.autogc") == 0) {
 101                 auto_gc = git_config_bool(var, value);
 102                 return 0;
 103         }
 104
 105         return git_default_config(var, value, cb);
 106 }
 107
 108 static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
 109 {
 110         if (sent_capabilities)
 111                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
 112         else
 113                 packet_write(1, "%s %s%c%s%s\n",
 114                              sha1_to_hex(sha1), path, 0,
 115                              " report-status delete-refs side-band-64k",
 116                              prefer_ofs_delta ? " ofs-delta" : "");
 117         sent_capabilities = 1;
 118         return 0;
 119 }
 120
 121 static void write_head_info(void)
 122 {
 123         for_each_ref(show_ref, NULL);
 124         if (!sent_capabilities)
 125                 show_ref("capabilities^{}", null_sha1, 0, NULL);
 126
 127 }
 128
 129 struct command {
 130         struct command *next;
 131         const char *error_string;
 132         unsigned char old_sha1[20];
 133         unsigned char new_sha1[20];
 134         char ref_name[FLEX_ARRAY]; /* more */
 135 };
 136
 137 static struct command *commands;
 138
 139 static const char pre_receive_hook[] = "hooks/pre-receive";
 140 static const char post_receive_hook[] = "hooks/post-receive";
 141
 142 static void rp_error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 143 static void rp_warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 144
 145 static void report_message(const char *prefix, const char *err, va_list params)
 146 {
 147         int sz = strlen(prefix);
 148         char msg[4096];
 149
 150         strncpy(msg, prefix, sz);
 151         sz += vsnprintf(msg + sz, sizeof(msg) - sz, err, params);
 152         if (sz > (sizeof(msg) - 1))
 153                 sz = sizeof(msg) - 1;
 154         msg[sz++] = '\n';
 155
 156         if (use_sideband)
 157                 send_sideband(1, 2, msg, sz, use_sideband);
 158         else
 159                 xwrite(2, msg, sz);
 160 }
 161
 162 static void rp_warning(const char *err, ...)
 163 {
 164         va_list params;
 165         va_start(params, err);
 166         report_message("warning: ", err, params);
 167         va_end(params);
 168 }
 169
 170 static void rp_error(const char *err, ...)
 171 {
 172         va_list params;
 173         va_start(params, err);
 174         report_message("error: ", err, params);
 175         va_end(params);
 176 }
 177
 178 static int copy_to_sideband(int in, int out, void *arg)
 179 {
 180         char data[128];
 181         while (1) {
 182                 ssize_t sz = xread(in, data, sizeof(data));
 183                 if (sz <= 0)
 184                         break;
 185                 send_sideband(1, 2, data, sz, use_sideband);
 186         }
 187         close(in);
 188         return 0;
 189 }
 190
 191 static int run_receive_hook(const char *hook_name)
 192 {
 193         static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
 194         struct command *cmd;
 195         struct child_process proc;
 196         struct async muxer;
 197         const char *argv[2];
 198         int have_input = 0, code;
 199
 200         for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
 201                 if (!cmd->error_string)
 202                         have_input = 1;
 203         }
 204
 205         if (!have_input || access(hook_name, X_OK) < 0)
 206                 return 0;
 207
 208         argv[0] = hook_name;
 209         argv[1] = NULL;
 210
 211         memset(&proc, 0, sizeof(proc));
 212         proc.argv = argv;
 213         proc.in = -1;
 214         proc.stdout_to_stderr = 1;
 215
 216         if (use_sideband) {
 217                 memset(&muxer, 0, sizeof(muxer));
 218                 muxer.proc = copy_to_sideband;
 219                 muxer.in = -1;
 220                 code = start_async(&muxer);
 221                 if (code)
 222                         return code;
 223                 proc.err = muxer.in;
 224         }
 225
 226         code = start_command(&proc);
 227         if (code) {
 228                 if (use_sideband)
 229                         finish_async(&muxer);
 230                 return code;
 231         }
 232
 233         for (cmd = commands; cmd; cmd = cmd->next) {
 234                 if (!cmd->error_string) {
 235                         size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
 236                                 sha1_to_hex(cmd->old_sha1),
 237                                 sha1_to_hex(cmd->new_sha1),
 238                                 cmd->ref_name);
 239                         if (write_in_full(proc.in, buf, n) != n)
 240                                 break;
 241                 }
 242         }
 243         close(proc.in);
 244         if (use_sideband)
 245                 finish_async(&muxer);
 246         return finish_command(&proc);
 247 }
 248
 249 static int run_update_hook(struct command *cmd)
 250 {
 251         static const char update_hook[] = "hooks/update";
 252         const char *argv[5];
 253         struct child_process proc;
 254         int code;
 255
 256         if (access(update_hook, X_OK) < 0)
 257                 return 0;
 258
 259         argv[0] = update_hook;
 260         argv[1] = cmd->ref_name;
 261         argv[2] = sha1_to_hex(cmd->old_sha1);
 262         argv[3] = sha1_to_hex(cmd->new_sha1);
 263         argv[4] = NULL;
 264
 265         memset(&proc, 0, sizeof(proc));
 266         proc.no_stdin = 1;
 267         proc.stdout_to_stderr = 1;
 268         proc.err = use_sideband ? -1 : 0;
 269         proc.argv = argv;
 270
 271         code = start_command(&proc);
 272         if (code)
 273                 return code;
 274         if (use_sideband)
 275                 copy_to_sideband(proc.err, -1, NULL);
 276         return finish_command(&proc);
 277 }
 278
 279 static int is_ref_checked_out(const char *ref)
 280 {
 281         if (is_bare_repository())
 282                 return 0;
 283
 284         if (!head_name)
 285                 return 0;
 286         return !strcmp(head_name, ref);
 287 }
 288
 289 static char *refuse_unconfigured_deny_msg[] = {
 290         "By default, updating the current branch in a non-bare repository",
 291         "is denied, because it will make the index and work tree inconsistent",
 292         "with what you pushed, and will require 'git reset --hard' to match",
 293         "the work tree to HEAD.",
 294         "",
 295         "You can set 'receive.denyCurrentBranch' configuration variable to",
 296         "'ignore' or 'warn' in the remote repository to allow pushing into",
 297         "its current branch; however, this is not recommended unless you",
 298         "arranged to update its work tree to match what you pushed in some",
 299         "other way.",
 300         "",
 301         "To squelch this message and still keep the default behaviour, set",
 302         "'receive.denyCurrentBranch' configuration variable to 'refuse'."
 303 };
 304
 305 static void refuse_unconfigured_deny(void)
 306 {
 307         int i;
 308         for (i = 0; i < ARRAY_SIZE(refuse_unconfigured_deny_msg); i++)
 309                 rp_error("%s", refuse_unconfigured_deny_msg[i]);
 310 }
 311
 312 static char *refuse_unconfigured_deny_delete_current_msg[] = {
 313         "By default, deleting the current branch is denied, because the next",
 314         "'git clone' won't result in any file checked out, causing confusion.",
 315         "",
 316         "You can set 'receive.denyDeleteCurrent' configuration variable to",
 317         "'warn' or 'ignore' in the remote repository to allow deleting the",
 318         "current branch, with or without a warning message.",
 319         "",
 320         "To squelch this message, you can set it to 'refuse'."
 321 };
 322
 323 static void refuse_unconfigured_deny_delete_current(void)
 324 {
 325         int i;
 326         for (i = 0;
 327              i < ARRAY_SIZE(refuse_unconfigured_deny_delete_current_msg);
 328              i++)
 329                 rp_error("%s", refuse_unconfigured_deny_delete_current_msg[i]);
 330 }
 331
 332 static const char *update(struct command *cmd)
 333 {
 334         const char *name = cmd->ref_name;
 335         unsigned char *old_sha1 = cmd->old_sha1;
 336         unsigned char *new_sha1 = cmd->new_sha1;
 337         struct ref_lock *lock;
 338
 339         /* only refs/... are allowed */
 340         if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
 341                 rp_error("refusing to create funny ref '%s' remotely", name);
 342                 return "funny refname";
 343         }
 344
 345         if (is_ref_checked_out(name)) {
 346                 switch (deny_current_branch) {
 347                 case DENY_IGNORE:
 348                         break;
 349                 case DENY_WARN:
 350                         rp_warning("updating the current branch");
 351                         break;
 352                 case DENY_REFUSE:
 353                 case DENY_UNCONFIGURED:
 354                         rp_error("refusing to update checked out branch: %s", name);
 355                         if (deny_current_branch == DENY_UNCONFIGURED)
 356                                 refuse_unconfigured_deny();
 357                         return "branch is currently checked out";
 358                 }
 359         }
 360
 361         if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
 362                 error("unpack should have generated %s, "
 363                       "but I can't find it!", sha1_to_hex(new_sha1));
 364                 return "bad pack";
 365         }
 366
 367         if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
 368                 if (deny_deletes && !prefixcmp(name, "refs/heads/")) {
 369                         rp_error("denying ref deletion for %s", name);
 370                         return "deletion prohibited";
 371                 }
 372
 373                 if (!strcmp(name, head_name)) {
 374                         switch (deny_delete_current) {
 375                         case DENY_IGNORE:
 376                                 break;
 377                         case DENY_WARN:
 378                                 rp_warning("deleting the current branch");
 379                                 break;
 380                         case DENY_REFUSE:
 381                         case DENY_UNCONFIGURED:
 382                                 if (deny_delete_current == DENY_UNCONFIGURED)
 383                                         refuse_unconfigured_deny_delete_current();
 384                                 rp_error("refusing to delete the current branch: %s", name);
 385                                 return "deletion of the current branch prohibited";
 386                         }
 387                 }
 388         }
 389
 390         if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
 391             !is_null_sha1(old_sha1) &&
 392             !prefixcmp(name, "refs/heads/")) {
 393                 struct object *old_object, *new_object;
 394                 struct commit *old_commit, *new_commit;
 395                 struct commit_list *bases, *ent;
 396
 397                 old_object = parse_object(old_sha1);
 398                 new_object = parse_object(new_sha1);
 399
 400                 if (!old_object || !new_object ||
 401                     old_object->type != OBJ_COMMIT ||
 402                     new_object->type != OBJ_COMMIT) {
 403                         error("bad sha1 objects for %s", name);
 404                         return "bad ref";
 405                 }
 406                 old_commit = (struct commit *)old_object;
 407                 new_commit = (struct commit *)new_object;
 408                 bases = get_merge_bases(old_commit, new_commit, 1);
 409                 for (ent = bases; ent; ent = ent->next)
 410                         if (!hashcmp(old_sha1, ent->item->object.sha1))
 411                                 break;
 412                 free_commit_list(bases);
 413                 if (!ent) {
 414                         rp_error("denying non-fast-forward %s"
 415                                  " (you should pull first)", name);
 416                         return "non-fast-forward";
 417                 }
 418         }
 419         if (run_update_hook(cmd)) {
 420                 rp_error("hook declined to update %s", name);
 421                 return "hook declined";
 422         }
 423
 424         if (is_null_sha1(new_sha1)) {
 425                 if (!parse_object(old_sha1)) {
 426                         rp_warning("Allowing deletion of corrupt ref.");
 427                         old_sha1 = NULL;
 428                 }
 429                 if (delete_ref(name, old_sha1, 0)) {
 430                         rp_error("failed to delete %s", name);
 431                         return "failed to delete";
 432                 }
 433                 return NULL; /* good */
 434         }
 435         else {
 436                 lock = lock_any_ref_for_update(name, old_sha1, 0);
 437                 if (!lock) {
 438                         rp_error("failed to lock %s", name);
 439                         return "failed to lock";
 440                 }
 441                 if (write_ref_sha1(lock, new_sha1, "push")) {
 442                         return "failed to write"; /* error() already called */
 443                 }
 444                 return NULL; /* good */
 445         }
 446 }
 447
 448 static char update_post_hook[] = "hooks/post-update";
 449
 450 static void run_update_post_hook(struct command *cmd)
 451 {
 452         struct command *cmd_p;
 453         int argc;
 454         const char **argv;
 455         struct child_process proc;
 456
 457         for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 458                 if (cmd_p->error_string)
 459                         continue;
 460                 argc++;
 461         }
 462         if (!argc || access(update_post_hook, X_OK) < 0)
 463                 return;
 464         argv = xmalloc(sizeof(*argv) * (2 + argc));
 465         argv[0] = update_post_hook;
 466
 467         for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 468                 char *p;
 469                 if (cmd_p->error_string)
 470                         continue;
 471                 p = xmalloc(strlen(cmd_p->ref_name) + 1);
 472                 strcpy(p, cmd_p->ref_name);
 473                 argv[argc] = p;
 474                 argc++;
 475         }
 476         argv[argc] = NULL;
 477
 478         memset(&proc, 0, sizeof(proc));
 479         proc.no_stdin = 1;
 480         proc.stdout_to_stderr = 1;
 481         proc.err = use_sideband ? -1 : 0;
 482         proc.argv = argv;
 483
 484         if (!start_command(&proc)) {
 485                 if (use_sideband)
 486                         copy_to_sideband(proc.err, -1, NULL);
 487                 finish_command(&proc);
 488         }
 489 }
 490
 491 static void execute_commands(const char *unpacker_error)
 492 {
 493         struct command *cmd = commands;
 494         unsigned char sha1[20];
 495
 496         if (unpacker_error) {
 497                 while (cmd) {
 498                         cmd->error_string = "n/a (unpacker error)";
 499                         cmd = cmd->next;
 500                 }
 501                 return;
 502         }
 503
 504         if (run_receive_hook(pre_receive_hook)) {
 505                 while (cmd) {
 506                         cmd->error_string = "pre-receive hook declined";
 507                         cmd = cmd->next;
 508                 }
 509                 return;
 510         }
 511
 512         head_name = resolve_ref("HEAD", sha1, 0, NULL);
 513
 514         while (cmd) {
 515                 cmd->error_string = update(cmd);
 516                 cmd = cmd->next;
 517         }
 518 }
 519
 520 static void read_head_info(void)
 521 {
 522         struct command **p = &commands;
 523         for (;;) {
 524                 static char line[1000];
 525                 unsigned char old_sha1[20], new_sha1[20];
 526                 struct command *cmd;
 527                 char *refname;
 528                 int len, reflen;
 529
 530                 len = packet_read_line(0, line, sizeof(line));
 531                 if (!len)
 532                         break;
 533                 if (line[len-1] == '\n')
 534                         line[--len] = 0;
 535                 if (len < 83 ||
 536                     line[40] != ' ' ||
 537                     line[81] != ' ' ||
 538                     get_sha1_hex(line, old_sha1) ||
 539                     get_sha1_hex(line + 41, new_sha1))
 540                         die("protocol error: expected old/new/ref, got '%s'",
 541                             line);
 542
 543                 refname = line + 82;
 544                 reflen = strlen(refname);
 545                 if (reflen + 82 < len) {
 546                         if (strstr(refname + reflen + 1, "report-status"))
 547                                 report_status = 1;
 548                         if (strstr(refname + reflen + 1, "side-band-64k"))
 549                                 use_sideband = LARGE_PACKET_MAX;
 550                 }
 551                 cmd = xmalloc(sizeof(struct command) + len - 80);
 552                 hashcpy(cmd->old_sha1, old_sha1);
 553                 hashcpy(cmd->new_sha1, new_sha1);
 554                 memcpy(cmd->ref_name, line + 82, len - 81);
 555                 cmd->error_string = NULL;
 556                 cmd->next = NULL;
 557                 *p = cmd;
 558                 p = &cmd->next;
 559         }
 560 }
 561
 562 static const char *parse_pack_header(struct pack_header *hdr)
 563 {
 564         switch (read_pack_header(0, hdr)) {
 565         case PH_ERROR_EOF:
 566                 return "eof before pack header was fully read";
 567
 568         case PH_ERROR_PACK_SIGNATURE:
 569                 return "protocol error (pack signature mismatch detected)";
 570
 571         case PH_ERROR_PROTOCOL:
 572                 return "protocol error (pack version unsupported)";
 573
 574         default:
 575                 return "unknown error in parse_pack_header";
 576
 577         case 0:
 578                 return NULL;
 579         }
 580 }
 581
 582 static const char *pack_lockfile;
 583
 584 static const char *unpack(void)
 585 {
 586         struct pack_header hdr;
 587         const char *hdr_err;
 588         char hdr_arg[38];
 589
 590         hdr_err = parse_pack_header(&hdr);
 591         if (hdr_err)
 592                 return hdr_err;
 593         snprintf(hdr_arg, sizeof(hdr_arg),
 594                         "--pack_header=%"PRIu32",%"PRIu32,
 595                         ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
 596
 597         if (ntohl(hdr.hdr_entries) < unpack_limit) {
 598                 int code, i = 0;
 599                 const char *unpacker[4];
 600                 unpacker[i++] = "unpack-objects";
 601                 if (receive_fsck_objects)
 602                         unpacker[i++] = "--strict";
 603                 unpacker[i++] = hdr_arg;
 604                 unpacker[i++] = NULL;
 605                 code = run_command_v_opt(unpacker, RUN_GIT_CMD);
 606                 if (!code)
 607                         return NULL;
 608                 return "unpack-objects abnormal exit";
 609         } else {
 610                 const char *keeper[7];
 611                 int s, status, i = 0;
 612                 char keep_arg[256];
 613                 struct child_process ip;
 614
 615                 s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
 616                 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
 617                         strcpy(keep_arg + s, "localhost");
 618
 619                 keeper[i++] = "index-pack";
 620                 keeper[i++] = "--stdin";
 621                 if (receive_fsck_objects)
 622                         keeper[i++] = "--strict";
 623                 keeper[i++] = "--fix-thin";
 624                 keeper[i++] = hdr_arg;
 625                 keeper[i++] = keep_arg;
 626                 keeper[i++] = NULL;
 627                 memset(&ip, 0, sizeof(ip));
 628                 ip.argv = keeper;
 629                 ip.out = -1;
 630                 ip.git_cmd = 1;
 631                 status = start_command(&ip);
 632                 if (status) {
 633                         return "index-pack fork failed";
 634                 }
 635                 pack_lockfile = index_pack_lockfile(ip.out);
 636                 close(ip.out);
 637                 status = finish_command(&ip);
 638                 if (!status) {
 639                         reprepare_packed_git();
 640                         return NULL;
 641                 }
 642                 return "index-pack abnormal exit";
 643         }
 644 }
 645
 646 static void report(const char *unpack_status)
 647 {
 648         struct command *cmd;
 649         struct strbuf buf = STRBUF_INIT;
 650
 651         packet_buf_write(&buf, "unpack %s\n",
 652                          unpack_status ? unpack_status : "ok");
 653         for (cmd = commands; cmd; cmd = cmd->next) {
 654                 if (!cmd->error_string)
 655                         packet_buf_write(&buf, "ok %s\n",
 656                                          cmd->ref_name);
 657                 else
 658                         packet_buf_write(&buf, "ng %s %s\n",
 659                                          cmd->ref_name, cmd->error_string);
 660         }
 661         packet_buf_flush(&buf);
 662
 663         if (use_sideband)
 664                 send_sideband(1, 1, buf.buf, buf.len, use_sideband);
 665         else
 666                 safe_write(1, buf.buf, buf.len);
 667         strbuf_release(&buf);
 668 }
 669
 670 static int delete_only(struct command *cmd)
 671 {
 672         while (cmd) {
 673                 if (!is_null_sha1(cmd->new_sha1))
 674                         return 0;
 675                 cmd = cmd->next;
 676         }
 677         return 1;
 678 }
 679
 680 static int add_refs_from_alternate(struct alternate_object_database *e, void *unused)
 681 {
 682         char *other;
 683         size_t len;
 684         struct remote *remote;
 685         struct transport *transport;
 686         const struct ref *extra;
 687
 688         e->name[-1] = '\0';
 689         other = xstrdup(make_absolute_path(e->base));
 690         e->name[-1] = '/';
 691         len = strlen(other);
 692
 693         while (other[len-1] == '/')
 694                 other[--len] = '\0';
 695         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
 696                 return 0;
 697         /* Is this a git repository with refs? */
 698         memcpy(other + len - 8, "/refs", 6);
 699         if (!is_directory(other))
 700                 return 0;
 701         other[len - 8] = '\0';
 702         remote = remote_get(other);
 703         transport = transport_get(remote, other);
 704         for (extra = transport_get_remote_refs(transport);
 705              extra;
 706              extra = extra->next) {
 707                 add_extra_ref(".have", extra->old_sha1, 0);
 708         }
 709         transport_disconnect(transport);
 710         free(other);
 711         return 0;
 712 }
 713
 714 static void add_alternate_refs(void)
 715 {
 716         foreach_alt_odb(add_refs_from_alternate, NULL);
 717 }
 718
 719 int cmd_receive_pack(int argc, const char **argv, const char *prefix)
 720 {
 721         int advertise_refs = 0;
 722         int stateless_rpc = 0;
 723         int i;
 724         char *dir = NULL;
 725
 726         argv++;
 727         for (i = 1; i < argc; i++) {
 728                 const char *arg = *argv++;
 729
 730                 if (*arg == '-') {
 731                         if (!strcmp(arg, "--advertise-refs")) {
 732                                 advertise_refs = 1;
 733                                 continue;
 734                         }
 735                         if (!strcmp(arg, "--stateless-rpc")) {
 736                                 stateless_rpc = 1;
 737                                 continue;
 738                         }
 739
 740                         usage(receive_pack_usage);
 741                 }
 742                 if (dir)
 743                         usage(receive_pack_usage);
 744                 dir = xstrdup(arg);
 745         }
 746         if (!dir)
 747                 usage(receive_pack_usage);
 748
 749         setup_path();
 750
 751         if (!enter_repo(dir, 0))
 752                 die("'%s' does not appear to be a git repository", dir);
 753
 754         if (is_repository_shallow())
 755                 die("attempt to push into a shallow repository");
 756
 757         git_config(receive_pack_config, NULL);
 758
 759         if (0 <= transfer_unpack_limit)
 760                 unpack_limit = transfer_unpack_limit;
 761         else if (0 <= receive_unpack_limit)
 762                 unpack_limit = receive_unpack_limit;
 763
 764         if (advertise_refs || !stateless_rpc) {
 765                 add_alternate_refs();
 766                 write_head_info();
 767                 clear_extra_refs();
 768
 769                 /* EOF */
 770                 packet_flush(1);
 771         }
 772         if (advertise_refs)
 773                 return 0;
 774
 775         read_head_info();
 776         if (commands) {
 777                 const char *unpack_status = NULL;
 778
 779                 if (!delete_only(commands))
 780                         unpack_status = unpack();
 781                 execute_commands(unpack_status);
 782                 if (pack_lockfile)
 783                         unlink_or_warn(pack_lockfile);
 784                 if (report_status)
 785                         report(unpack_status);
 786                 run_receive_hook(post_receive_hook);
 787                 run_update_post_hook(commands);
 788                 if (auto_gc) {
 789                         const char *argv_gc_auto[] = {
 790                                 "gc", "--auto", "--quiet", NULL,
 791                         };
 792                         run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
 793                 }
 794                 if (auto_update_server_info)
 795                         update_server_info(0);
 796         }
 797         if (use_sideband)
 798                 packet_flush(1);
 799         return 0;
 800 }