git.oblomov.eu Git - git/blob - builtin/clone.c

   1 /*
   2  * Builtin "git clone"
   3  *
   4  * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
   5  *               2008 Daniel Barkalow <barkalow@iabervon.org>
   6  * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
   7  *
   8  * Clone a repository into a different directory that does not yet exist.
   9  */
  10
  11 #define USE_THE_INDEX_COMPATIBILITY_MACROS
  12 #include "builtin.h"
  13 #include "config.h"
  14 #include "lockfile.h"
  15 #include "parse-options.h"
  16 #include "fetch-pack.h"
  17 #include "refs.h"
  18 #include "refspec.h"
  19 #include "object-store.h"
  20 #include "tree.h"
  21 #include "tree-walk.h"
  22 #include "unpack-trees.h"
  23 #include "transport.h"
  24 #include "strbuf.h"
  25 #include "dir.h"
  26 #include "dir-iterator.h"
  27 #include "iterator.h"
  28 #include "sigchain.h"
  29 #include "branch.h"
  30 #include "remote.h"
  31 #include "run-command.h"
  32 #include "connected.h"
  33 #include "packfile.h"
  34 #include "list-objects-filter-options.h"
  35
  36 /*
  37  * Overall FIXMEs:
  38  *  - respect DB_ENVIRONMENT for .git/objects.
  39  *
  40  * Implementation notes:
  41  *  - dropping use-separate-remote and no-separate-remote compatibility
  42  *
  43  */
  44 static const char * const builtin_clone_usage[] = {
  45         N_("git clone [<options>] [--] <repo> [<dir>]"),
  46         NULL
  47 };
  48
  49 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  50 static int option_local = -1, option_no_hardlinks, option_shared;
  51 static int option_no_tags;
  52 static int option_shallow_submodules;
  53 static int deepen;
  54 static char *option_template, *option_depth, *option_since;
  55 static char *option_origin = NULL;
  56 static char *option_branch = NULL;
  57 static struct string_list option_not = STRING_LIST_INIT_NODUP;
  58 static const char *real_git_dir;
  59 static char *option_upload_pack = "git-upload-pack";
  60 static int option_verbosity;
  61 static int option_progress = -1;
  62 static int option_sparse_checkout;
  63 static enum transport_family family;
  64 static struct string_list option_config = STRING_LIST_INIT_NODUP;
  65 static struct string_list option_required_reference = STRING_LIST_INIT_NODUP;
  66 static struct string_list option_optional_reference = STRING_LIST_INIT_NODUP;
  67 static int option_dissociate;
  68 static int max_jobs = -1;
  69 static struct string_list option_recurse_submodules = STRING_LIST_INIT_NODUP;
  70 static struct list_objects_filter_options filter_options;
  71 static struct string_list server_options = STRING_LIST_INIT_NODUP;
  72 static int option_remote_submodules;
  73
  74 static int recurse_submodules_cb(const struct option *opt,
  75                                  const char *arg, int unset)
  76 {
  77         if (unset)
  78                 string_list_clear((struct string_list *)opt->value, 0);
  79         else if (arg)
  80                 string_list_append((struct string_list *)opt->value, arg);
  81         else
  82                 string_list_append((struct string_list *)opt->value,
  83                                    (const char *)opt->defval);
  84
  85         return 0;
  86 }
  87
  88 static struct option builtin_clone_options[] = {
  89         OPT__VERBOSITY(&option_verbosity),
  90         OPT_BOOL(0, "progress", &option_progress,
  91                  N_("force progress reporting")),
  92         OPT_BOOL('n', "no-checkout", &option_no_checkout,
  93                  N_("don't create a checkout")),
  94         OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
  95         OPT_HIDDEN_BOOL(0, "naked", &option_bare,
  96                         N_("create a bare repository")),
  97         OPT_BOOL(0, "mirror", &option_mirror,
  98                  N_("create a mirror repository (implies bare)")),
  99         OPT_BOOL('l', "local", &option_local,
 100                 N_("to clone from a local repository")),
 101         OPT_BOOL(0, "no-hardlinks", &option_no_hardlinks,
 102                     N_("don't use local hardlinks, always copy")),
 103         OPT_BOOL('s', "shared", &option_shared,
 104                     N_("setup as shared repository")),
 105         { OPTION_CALLBACK, 0, "recurse-submodules", &option_recurse_submodules,
 106           N_("pathspec"), N_("initialize submodules in the clone"),
 107           PARSE_OPT_OPTARG, recurse_submodules_cb, (intptr_t)"." },
 108         OPT_ALIAS(0, "recursive", "recurse-submodules"),
 109         OPT_INTEGER('j', "jobs", &max_jobs,
 110                     N_("number of submodules cloned in parallel")),
 111         OPT_STRING(0, "template", &option_template, N_("template-directory"),
 112                    N_("directory from which templates will be used")),
 113         OPT_STRING_LIST(0, "reference", &option_required_reference, N_("repo"),
 114                         N_("reference repository")),
 115         OPT_STRING_LIST(0, "reference-if-able", &option_optional_reference,
 116                         N_("repo"), N_("reference repository")),
 117         OPT_BOOL(0, "dissociate", &option_dissociate,
 118                  N_("use --reference only while cloning")),
 119         OPT_STRING('o', "origin", &option_origin, N_("name"),
 120                    N_("use <name> instead of 'origin' to track upstream")),
 121         OPT_STRING('b', "branch", &option_branch, N_("branch"),
 122                    N_("checkout <branch> instead of the remote's HEAD")),
 123         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
 124                    N_("path to git-upload-pack on the remote")),
 125         OPT_STRING(0, "depth", &option_depth, N_("depth"),
 126                     N_("create a shallow clone of that depth")),
 127         OPT_STRING(0, "shallow-since", &option_since, N_("time"),
 128                     N_("create a shallow clone since a specific time")),
 129         OPT_STRING_LIST(0, "shallow-exclude", &option_not, N_("revision"),
 130                         N_("deepen history of shallow clone, excluding rev")),
 131         OPT_BOOL(0, "single-branch", &option_single_branch,
 132                     N_("clone only one branch, HEAD or --branch")),
 133         OPT_BOOL(0, "no-tags", &option_no_tags,
 134                  N_("don't clone any tags, and make later fetches not to follow them")),
 135         OPT_BOOL(0, "shallow-submodules", &option_shallow_submodules,
 136                     N_("any cloned submodules will be shallow")),
 137         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 138                    N_("separate git dir from working tree")),
 139         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 140                         N_("set config inside the new repository")),
 141         OPT_STRING_LIST(0, "server-option", &server_options,
 142                         N_("server-specific"), N_("option to transmit")),
 143         OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 144                         TRANSPORT_FAMILY_IPV4),
 145         OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 146                         TRANSPORT_FAMILY_IPV6),
 147         OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
 148         OPT_BOOL(0, "remote-submodules", &option_remote_submodules,
 149                     N_("any cloned submodules will use their remote-tracking branch")),
 150         OPT_BOOL(0, "sparse", &option_sparse_checkout,
 151                     N_("initialize sparse-checkout file to include only files at root")),
 152         OPT_END()
 153 };
 154
 155 static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
 156 {
 157         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 158         static char *bundle_suffix[] = { ".bundle", "" };
 159         size_t baselen = path->len;
 160         struct stat st;
 161         int i;
 162
 163         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 164                 strbuf_setlen(path, baselen);
 165                 strbuf_addstr(path, suffix[i]);
 166                 if (stat(path->buf, &st))
 167                         continue;
 168                 if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
 169                         *is_bundle = 0;
 170                         return path->buf;
 171                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 172                         /* Is it a "gitfile"? */
 173                         char signature[8];
 174                         const char *dst;
 175                         int len, fd = open(path->buf, O_RDONLY);
 176                         if (fd < 0)
 177                                 continue;
 178                         len = read_in_full(fd, signature, 8);
 179                         close(fd);
 180                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 181                                 continue;
 182                         dst = read_gitfile(path->buf);
 183                         if (dst) {
 184                                 *is_bundle = 0;
 185                                 return dst;
 186                         }
 187                 }
 188         }
 189
 190         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 191                 strbuf_setlen(path, baselen);
 192                 strbuf_addstr(path, bundle_suffix[i]);
 193                 if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
 194                         *is_bundle = 1;
 195                         return path->buf;
 196                 }
 197         }
 198
 199         return NULL;
 200 }
 201
 202 static char *get_repo_path(const char *repo, int *is_bundle)
 203 {
 204         struct strbuf path = STRBUF_INIT;
 205         const char *raw;
 206         char *canon;
 207
 208         strbuf_addstr(&path, repo);
 209         raw = get_repo_path_1(&path, is_bundle);
 210         canon = raw ? absolute_pathdup(raw) : NULL;
 211         strbuf_release(&path);
 212         return canon;
 213 }
 214
 215 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 216 {
 217         const char *end = repo + strlen(repo), *start, *ptr;
 218         size_t len;
 219         char *dir;
 220
 221         /*
 222          * Skip scheme.
 223          */
 224         start = strstr(repo, "://");
 225         if (start == NULL)
 226                 start = repo;
 227         else
 228                 start += 3;
 229
 230         /*
 231          * Skip authentication data. The stripping does happen
 232          * greedily, such that we strip up to the last '@' inside
 233          * the host part.
 234          */
 235         for (ptr = start; ptr < end && !is_dir_sep(*ptr); ptr++) {
 236                 if (*ptr == '@')
 237                         start = ptr + 1;
 238         }
 239
 240         /*
 241          * Strip trailing spaces, slashes and /.git
 242          */
 243         while (start < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 244                 end--;
 245         if (end - start > 5 && is_dir_sep(end[-5]) &&
 246             !strncmp(end - 4, ".git", 4)) {
 247                 end -= 5;
 248                 while (start < end && is_dir_sep(end[-1]))
 249                         end--;
 250         }
 251
 252         /*
 253          * Strip trailing port number if we've got only a
 254          * hostname (that is, there is no dir separator but a
 255          * colon). This check is required such that we do not
 256          * strip URI's like '/foo/bar:2222.git', which should
 257          * result in a dir '2222' being guessed due to backwards
 258          * compatibility.
 259          */
 260         if (memchr(start, '/', end - start) == NULL
 261             && memchr(start, ':', end - start) != NULL) {
 262                 ptr = end;
 263                 while (start < ptr && isdigit(ptr[-1]) && ptr[-1] != ':')
 264                         ptr--;
 265                 if (start < ptr && ptr[-1] == ':')
 266                         end = ptr - 1;
 267         }
 268
 269         /*
 270          * Find last component. To remain backwards compatible we
 271          * also regard colons as path separators, such that
 272          * cloning a repository 'foo:bar.git' would result in a
 273          * directory 'bar' being guessed.
 274          */
 275         ptr = end;
 276         while (start < ptr && !is_dir_sep(ptr[-1]) && ptr[-1] != ':')
 277                 ptr--;
 278         start = ptr;
 279
 280         /*
 281          * Strip .{bundle,git}.
 282          */
 283         len = end - start;
 284         strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
 285
 286         if (!len || (len == 1 && *start == '/'))
 287                 die(_("No directory name could be guessed.\n"
 288                       "Please specify a directory on the command line"));
 289
 290         if (is_bare)
 291                 dir = xstrfmt("%.*s.git", (int)len, start);
 292         else
 293                 dir = xstrndup(start, len);
 294         /*
 295          * Replace sequences of 'control' characters and whitespace
 296          * with one ascii space, remove leading and trailing spaces.
 297          */
 298         if (*dir) {
 299                 char *out = dir;
 300                 int prev_space = 1 /* strip leading whitespace */;
 301                 for (end = dir; *end; ++end) {
 302                         char ch = *end;
 303                         if ((unsigned char)ch < '\x20')
 304                                 ch = '\x20';
 305                         if (isspace(ch)) {
 306                                 if (prev_space)
 307                                         continue;
 308                                 prev_space = 1;
 309                         } else
 310                                 prev_space = 0;
 311                         *out++ = ch;
 312                 }
 313                 *out = '\0';
 314                 if (out > dir && prev_space)
 315                         out[-1] = '\0';
 316         }
 317         return dir;
 318 }
 319
 320 static void strip_trailing_slashes(char *dir)
 321 {
 322         char *end = dir + strlen(dir);
 323
 324         while (dir < end - 1 && is_dir_sep(end[-1]))
 325                 end--;
 326         *end = '\0';
 327 }
 328
 329 static int add_one_reference(struct string_list_item *item, void *cb_data)
 330 {
 331         struct strbuf err = STRBUF_INIT;
 332         int *required = cb_data;
 333         char *ref_git = compute_alternate_path(item->string, &err);
 334
 335         if (!ref_git) {
 336                 if (*required)
 337                         die("%s", err.buf);
 338                 else
 339                         fprintf(stderr,
 340                                 _("info: Could not add alternate for '%s': %s\n"),
 341                                 item->string, err.buf);
 342         } else {
 343                 struct strbuf sb = STRBUF_INIT;
 344                 strbuf_addf(&sb, "%s/objects", ref_git);
 345                 add_to_alternates_file(sb.buf);
 346                 strbuf_release(&sb);
 347         }
 348
 349         strbuf_release(&err);
 350         free(ref_git);
 351         return 0;
 352 }
 353
 354 static void setup_reference(void)
 355 {
 356         int required = 1;
 357         for_each_string_list(&option_required_reference,
 358                              add_one_reference, &required);
 359         required = 0;
 360         for_each_string_list(&option_optional_reference,
 361                              add_one_reference, &required);
 362 }
 363
 364 static void copy_alternates(struct strbuf *src, const char *src_repo)
 365 {
 366         /*
 367          * Read from the source objects/info/alternates file
 368          * and copy the entries to corresponding file in the
 369          * destination repository with add_to_alternates_file().
 370          * Both src and dst have "$path/objects/info/alternates".
 371          *
 372          * Instead of copying bit-for-bit from the original,
 373          * we need to append to existing one so that the already
 374          * created entry via "clone -s" is not lost, and also
 375          * to turn entries with paths relative to the original
 376          * absolute, so that they can be used in the new repository.
 377          */
 378         FILE *in = xfopen(src->buf, "r");
 379         struct strbuf line = STRBUF_INIT;
 380
 381         while (strbuf_getline(&line, in) != EOF) {
 382                 char *abs_path;
 383                 if (!line.len || line.buf[0] == '#')
 384                         continue;
 385                 if (is_absolute_path(line.buf)) {
 386                         add_to_alternates_file(line.buf);
 387                         continue;
 388                 }
 389                 abs_path = mkpathdup("%s/objects/%s", src_repo, line.buf);
 390                 if (!normalize_path_copy(abs_path, abs_path))
 391                         add_to_alternates_file(abs_path);
 392                 else
 393                         warning("skipping invalid relative alternate: %s/%s",
 394                                 src_repo, line.buf);
 395                 free(abs_path);
 396         }
 397         strbuf_release(&line);
 398         fclose(in);
 399 }
 400
 401 static void mkdir_if_missing(const char *pathname, mode_t mode)
 402 {
 403         struct stat st;
 404
 405         if (!mkdir(pathname, mode))
 406                 return;
 407
 408         if (errno != EEXIST)
 409                 die_errno(_("failed to create directory '%s'"), pathname);
 410         else if (stat(pathname, &st))
 411                 die_errno(_("failed to stat '%s'"), pathname);
 412         else if (!S_ISDIR(st.st_mode))
 413                 die(_("%s exists and is not a directory"), pathname);
 414 }
 415
 416 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 417                                    const char *src_repo)
 418 {
 419         int src_len, dest_len;
 420         struct dir_iterator *iter;
 421         int iter_status;
 422         unsigned int flags;
 423         struct strbuf realpath = STRBUF_INIT;
 424
 425         mkdir_if_missing(dest->buf, 0777);
 426
 427         flags = DIR_ITERATOR_PEDANTIC | DIR_ITERATOR_FOLLOW_SYMLINKS;
 428         iter = dir_iterator_begin(src->buf, flags);
 429
 430         if (!iter)
 431                 die_errno(_("failed to start iterator over '%s'"), src->buf);
 432
 433         strbuf_addch(src, '/');
 434         src_len = src->len;
 435         strbuf_addch(dest, '/');
 436         dest_len = dest->len;
 437
 438         while ((iter_status = dir_iterator_advance(iter)) == ITER_OK) {
 439                 strbuf_setlen(src, src_len);
 440                 strbuf_addstr(src, iter->relative_path);
 441                 strbuf_setlen(dest, dest_len);
 442                 strbuf_addstr(dest, iter->relative_path);
 443
 444                 if (S_ISDIR(iter->st.st_mode)) {
 445                         mkdir_if_missing(dest->buf, 0777);
 446                         continue;
 447                 }
 448
 449                 /* Files that cannot be copied bit-for-bit... */
 450                 if (!fspathcmp(iter->relative_path, "info/alternates")) {
 451                         copy_alternates(src, src_repo);
 452                         continue;
 453                 }
 454
 455                 if (unlink(dest->buf) && errno != ENOENT)
 456                         die_errno(_("failed to unlink '%s'"), dest->buf);
 457                 if (!option_no_hardlinks) {
 458                         strbuf_realpath(&realpath, src->buf, 1);
 459                         if (!link(realpath.buf, dest->buf))
 460                                 continue;
 461                         if (option_local > 0)
 462                                 die_errno(_("failed to create link '%s'"), dest->buf);
 463                         option_no_hardlinks = 1;
 464                 }
 465                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 466                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 467         }
 468
 469         if (iter_status != ITER_DONE) {
 470                 strbuf_setlen(src, src_len);
 471                 die(_("failed to iterate over '%s'"), src->buf);
 472         }
 473
 474         strbuf_release(&realpath);
 475 }
 476
 477 static void clone_local(const char *src_repo, const char *dest_repo)
 478 {
 479         if (option_shared) {
 480                 struct strbuf alt = STRBUF_INIT;
 481                 get_common_dir(&alt, src_repo);
 482                 strbuf_addstr(&alt, "/objects");
 483                 add_to_alternates_file(alt.buf);
 484                 strbuf_release(&alt);
 485         } else {
 486                 struct strbuf src = STRBUF_INIT;
 487                 struct strbuf dest = STRBUF_INIT;
 488                 get_common_dir(&src, src_repo);
 489                 get_common_dir(&dest, dest_repo);
 490                 strbuf_addstr(&src, "/objects");
 491                 strbuf_addstr(&dest, "/objects");
 492                 copy_or_link_directory(&src, &dest, src_repo);
 493                 strbuf_release(&src);
 494                 strbuf_release(&dest);
 495         }
 496
 497         if (0 <= option_verbosity)
 498                 fprintf(stderr, _("done.\n"));
 499 }
 500
 501 static const char *junk_work_tree;
 502 static int junk_work_tree_flags;
 503 static const char *junk_git_dir;
 504 static int junk_git_dir_flags;
 505 static enum {
 506         JUNK_LEAVE_NONE,
 507         JUNK_LEAVE_REPO,
 508         JUNK_LEAVE_ALL
 509 } junk_mode = JUNK_LEAVE_NONE;
 510
 511 static const char junk_leave_repo_msg[] =
 512 N_("Clone succeeded, but checkout failed.\n"
 513    "You can inspect what was checked out with 'git status'\n"
 514    "and retry with 'git restore --source=HEAD :/'\n");
 515
 516 static void remove_junk(void)
 517 {
 518         struct strbuf sb = STRBUF_INIT;
 519
 520         switch (junk_mode) {
 521         case JUNK_LEAVE_REPO:
 522                 warning("%s", _(junk_leave_repo_msg));
 523                 /* fall-through */
 524         case JUNK_LEAVE_ALL:
 525                 return;
 526         default:
 527                 /* proceed to removal */
 528                 break;
 529         }
 530
 531         if (junk_git_dir) {
 532                 strbuf_addstr(&sb, junk_git_dir);
 533                 remove_dir_recursively(&sb, junk_git_dir_flags);
 534                 strbuf_reset(&sb);
 535         }
 536         if (junk_work_tree) {
 537                 strbuf_addstr(&sb, junk_work_tree);
 538                 remove_dir_recursively(&sb, junk_work_tree_flags);
 539         }
 540         strbuf_release(&sb);
 541 }
 542
 543 static void remove_junk_on_signal(int signo)
 544 {
 545         remove_junk();
 546         sigchain_pop(signo);
 547         raise(signo);
 548 }
 549
 550 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 551 {
 552         struct ref *ref;
 553         struct strbuf head = STRBUF_INIT;
 554         strbuf_addstr(&head, "refs/heads/");
 555         strbuf_addstr(&head, branch);
 556         ref = find_ref_by_name(refs, head.buf);
 557         strbuf_release(&head);
 558
 559         if (ref)
 560                 return ref;
 561
 562         strbuf_addstr(&head, "refs/tags/");
 563         strbuf_addstr(&head, branch);
 564         ref = find_ref_by_name(refs, head.buf);
 565         strbuf_release(&head);
 566
 567         return ref;
 568 }
 569
 570 static struct ref *wanted_peer_refs(const struct ref *refs,
 571                 struct refspec *refspec)
 572 {
 573         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 574         struct ref *local_refs = head;
 575         struct ref **tail = head ? &head->next : &local_refs;
 576
 577         if (option_single_branch) {
 578                 struct ref *remote_head = NULL;
 579
 580                 if (!option_branch)
 581                         remote_head = guess_remote_head(head, refs, 0);
 582                 else {
 583                         local_refs = NULL;
 584                         tail = &local_refs;
 585                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 586                 }
 587
 588                 if (!remote_head && option_branch)
 589                         warning(_("Could not find remote branch %s to clone."),
 590                                 option_branch);
 591                 else {
 592                         int i;
 593                         for (i = 0; i < refspec->nr; i++)
 594                                 get_fetch_map(remote_head, &refspec->items[i],
 595                                               &tail, 0);
 596
 597                         /* if --branch=tag, pull the requested tag explicitly */
 598                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 599                 }
 600         } else {
 601                 int i;
 602                 for (i = 0; i < refspec->nr; i++)
 603                         get_fetch_map(refs, &refspec->items[i], &tail, 0);
 604         }
 605
 606         if (!option_mirror && !option_single_branch && !option_no_tags)
 607                 get_fetch_map(refs, tag_refspec, &tail, 0);
 608
 609         return local_refs;
 610 }
 611
 612 static void write_remote_refs(const struct ref *local_refs)
 613 {
 614         const struct ref *r;
 615
 616         struct ref_transaction *t;
 617         struct strbuf err = STRBUF_INIT;
 618
 619         t = ref_transaction_begin(&err);
 620         if (!t)
 621                 die("%s", err.buf);
 622
 623         for (r = local_refs; r; r = r->next) {
 624                 if (!r->peer_ref)
 625                         continue;
 626                 if (ref_transaction_create(t, r->peer_ref->name, &r->old_oid,
 627                                            0, NULL, &err))
 628                         die("%s", err.buf);
 629         }
 630
 631         if (initial_ref_transaction_commit(t, &err))
 632                 die("%s", err.buf);
 633
 634         strbuf_release(&err);
 635         ref_transaction_free(t);
 636 }
 637
 638 static void write_followtags(const struct ref *refs, const char *msg)
 639 {
 640         const struct ref *ref;
 641         for (ref = refs; ref; ref = ref->next) {
 642                 if (!starts_with(ref->name, "refs/tags/"))
 643                         continue;
 644                 if (ends_with(ref->name, "^{}"))
 645                         continue;
 646                 if (!has_object_file_with_flags(&ref->old_oid,
 647                                                 OBJECT_INFO_QUICK |
 648                                                 OBJECT_INFO_SKIP_FETCH_OBJECT))
 649                         continue;
 650                 update_ref(msg, ref->name, &ref->old_oid, NULL, 0,
 651                            UPDATE_REFS_DIE_ON_ERR);
 652         }
 653 }
 654
 655 static int iterate_ref_map(void *cb_data, struct object_id *oid)
 656 {
 657         struct ref **rm = cb_data;
 658         struct ref *ref = *rm;
 659
 660         /*
 661          * Skip anything missing a peer_ref, which we are not
 662          * actually going to write a ref for.
 663          */
 664         while (ref && !ref->peer_ref)
 665                 ref = ref->next;
 666         /* Returning -1 notes "end of list" to the caller. */
 667         if (!ref)
 668                 return -1;
 669
 670         oidcpy(oid, &ref->old_oid);
 671         *rm = ref->next;
 672         return 0;
 673 }
 674
 675 static void update_remote_refs(const struct ref *refs,
 676                                const struct ref *mapped_refs,
 677                                const struct ref *remote_head_points_at,
 678                                const char *branch_top,
 679                                const char *msg,
 680                                struct transport *transport,
 681                                int check_connectivity)
 682 {
 683         const struct ref *rm = mapped_refs;
 684
 685         if (check_connectivity) {
 686                 struct check_connected_options opt = CHECK_CONNECTED_INIT;
 687
 688                 opt.transport = transport;
 689                 opt.progress = transport->progress;
 690
 691                 if (check_connected(iterate_ref_map, &rm, &opt))
 692                         die(_("remote did not send all necessary objects"));
 693         }
 694
 695         if (refs) {
 696                 write_remote_refs(mapped_refs);
 697                 if (option_single_branch && !option_no_tags)
 698                         write_followtags(refs, msg);
 699         }
 700
 701         if (remote_head_points_at && !option_bare) {
 702                 struct strbuf head_ref = STRBUF_INIT;
 703                 strbuf_addstr(&head_ref, branch_top);
 704                 strbuf_addstr(&head_ref, "HEAD");
 705                 if (create_symref(head_ref.buf,
 706                                   remote_head_points_at->peer_ref->name,
 707                                   msg) < 0)
 708                         die(_("unable to update %s"), head_ref.buf);
 709                 strbuf_release(&head_ref);
 710         }
 711 }
 712
 713 static void update_head(const struct ref *our, const struct ref *remote,
 714                         const char *msg)
 715 {
 716         const char *head;
 717         if (our && skip_prefix(our->name, "refs/heads/", &head)) {
 718                 /* Local default branch link */
 719                 if (create_symref("HEAD", our->name, NULL) < 0)
 720                         die(_("unable to update HEAD"));
 721                 if (!option_bare) {
 722                         update_ref(msg, "HEAD", &our->old_oid, NULL, 0,
 723                                    UPDATE_REFS_DIE_ON_ERR);
 724                         install_branch_config(0, head, option_origin, our->name);
 725                 }
 726         } else if (our) {
 727                 struct commit *c = lookup_commit_reference(the_repository,
 728                                                            &our->old_oid);
 729                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 730                 update_ref(msg, "HEAD", &c->object.oid, NULL, REF_NO_DEREF,
 731                            UPDATE_REFS_DIE_ON_ERR);
 732         } else if (remote) {
 733                 /*
 734                  * We know remote HEAD points to a non-branch, or
 735                  * HEAD points to a branch but we don't know which one.
 736                  * Detach HEAD in all these cases.
 737                  */
 738                 update_ref(msg, "HEAD", &remote->old_oid, NULL, REF_NO_DEREF,
 739                            UPDATE_REFS_DIE_ON_ERR);
 740         }
 741 }
 742
 743 static int git_sparse_checkout_init(const char *repo)
 744 {
 745         struct argv_array argv = ARGV_ARRAY_INIT;
 746         int result = 0;
 747         argv_array_pushl(&argv, "-C", repo, "sparse-checkout", "init", NULL);
 748
 749         /*
 750          * We must apply the setting in the current process
 751          * for the later checkout to use the sparse-checkout file.
 752          */
 753         core_apply_sparse_checkout = 1;
 754
 755         if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
 756                 error(_("failed to initialize sparse-checkout"));
 757                 result = 1;
 758         }
 759
 760         argv_array_clear(&argv);
 761         return result;
 762 }
 763
 764 static int checkout(int submodule_progress)
 765 {
 766         struct object_id oid;
 767         char *head;
 768         struct lock_file lock_file = LOCK_INIT;
 769         struct unpack_trees_options opts;
 770         struct tree *tree;
 771         struct tree_desc t;
 772         int err = 0;
 773
 774         if (option_no_checkout)
 775                 return 0;
 776
 777         head = resolve_refdup("HEAD", RESOLVE_REF_READING, &oid, NULL);
 778         if (!head) {
 779                 warning(_("remote HEAD refers to nonexistent ref, "
 780                           "unable to checkout.\n"));
 781                 return 0;
 782         }
 783         if (!strcmp(head, "HEAD")) {
 784                 if (advice_detached_head)
 785                         detach_advice(oid_to_hex(&oid));
 786                 FREE_AND_NULL(head);
 787         } else {
 788                 if (!starts_with(head, "refs/heads/"))
 789                         die(_("HEAD not found below refs/heads!"));
 790         }
 791
 792         /* We need to be in the new work tree for the checkout */
 793         setup_work_tree();
 794
 795         hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
 796
 797         memset(&opts, 0, sizeof opts);
 798         opts.update = 1;
 799         opts.merge = 1;
 800         opts.clone = 1;
 801         opts.fn = oneway_merge;
 802         opts.verbose_update = (option_verbosity >= 0);
 803         opts.src_index = &the_index;
 804         opts.dst_index = &the_index;
 805         init_checkout_metadata(&opts.meta, head, &oid, NULL);
 806
 807         tree = parse_tree_indirect(&oid);
 808         parse_tree(tree);
 809         init_tree_desc(&t, tree->buffer, tree->size);
 810         if (unpack_trees(1, &t, &opts) < 0)
 811                 die(_("unable to checkout working tree"));
 812
 813         free(head);
 814
 815         if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 816                 die(_("unable to write new index file"));
 817
 818         err |= run_hook_le(NULL, "post-checkout", oid_to_hex(&null_oid),
 819                            oid_to_hex(&oid), "1", NULL);
 820
 821         if (!err && (option_recurse_submodules.nr > 0)) {
 822                 struct argv_array args = ARGV_ARRAY_INIT;
 823                 argv_array_pushl(&args, "submodule", "update", "--require-init", "--recursive", NULL);
 824
 825                 if (option_shallow_submodules == 1)
 826                         argv_array_push(&args, "--depth=1");
 827
 828                 if (max_jobs != -1)
 829                         argv_array_pushf(&args, "--jobs=%d", max_jobs);
 830
 831                 if (submodule_progress)
 832                         argv_array_push(&args, "--progress");
 833
 834                 if (option_verbosity < 0)
 835                         argv_array_push(&args, "--quiet");
 836
 837                 if (option_remote_submodules) {
 838                         argv_array_push(&args, "--remote");
 839                         argv_array_push(&args, "--no-fetch");
 840                 }
 841
 842                 if (option_single_branch >= 0)
 843                         argv_array_push(&args, option_single_branch ?
 844                                                "--single-branch" :
 845                                                "--no-single-branch");
 846
 847                 err = run_command_v_opt(args.argv, RUN_GIT_CMD);
 848                 argv_array_clear(&args);
 849         }
 850
 851         return err;
 852 }
 853
 854 static int write_one_config(const char *key, const char *value, void *data)
 855 {
 856         return git_config_set_multivar_gently(key,
 857                                               value ? value : "true",
 858                                               CONFIG_REGEX_NONE, 0);
 859 }
 860
 861 static void write_config(struct string_list *config)
 862 {
 863         int i;
 864
 865         for (i = 0; i < config->nr; i++) {
 866                 if (git_config_parse_parameter(config->items[i].string,
 867                                                write_one_config, NULL) < 0)
 868                         die(_("unable to write parameters to config file"));
 869         }
 870 }
 871
 872 static void write_refspec_config(const char *src_ref_prefix,
 873                 const struct ref *our_head_points_at,
 874                 const struct ref *remote_head_points_at,
 875                 struct strbuf *branch_top)
 876 {
 877         struct strbuf key = STRBUF_INIT;
 878         struct strbuf value = STRBUF_INIT;
 879
 880         if (option_mirror || !option_bare) {
 881                 if (option_single_branch && !option_mirror) {
 882                         if (option_branch) {
 883                                 if (starts_with(our_head_points_at->name, "refs/tags/"))
 884                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 885                                                 our_head_points_at->name);
 886                                 else
 887                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 888                                                 branch_top->buf, option_branch);
 889                         } else if (remote_head_points_at) {
 890                                 const char *head = remote_head_points_at->name;
 891                                 if (!skip_prefix(head, "refs/heads/", &head))
 892                                         BUG("remote HEAD points at non-head?");
 893
 894                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 895                                                 branch_top->buf, head);
 896                         }
 897                         /*
 898                          * otherwise, the next "git fetch" will
 899                          * simply fetch from HEAD without updating
 900                          * any remote-tracking branch, which is what
 901                          * we want.
 902                          */
 903                 } else {
 904                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 905                 }
 906                 /* Configure the remote */
 907                 if (value.len) {
 908                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 909                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 910                         strbuf_reset(&key);
 911
 912                         if (option_mirror) {
 913                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 914                                 git_config_set(key.buf, "true");
 915                                 strbuf_reset(&key);
 916                         }
 917                 }
 918         }
 919
 920         strbuf_release(&key);
 921         strbuf_release(&value);
 922 }
 923
 924 static void dissociate_from_references(void)
 925 {
 926         static const char* argv[] = { "repack", "-a", "-d", NULL };
 927         char *alternates = git_pathdup("objects/info/alternates");
 928
 929         if (!access(alternates, F_OK)) {
 930                 if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
 931                         die(_("cannot repack to clean up"));
 932                 if (unlink(alternates) && errno != ENOENT)
 933                         die_errno(_("cannot unlink temporary alternates file"));
 934         }
 935         free(alternates);
 936 }
 937
 938 static int path_exists(const char *path)
 939 {
 940         struct stat sb;
 941         return !stat(path, &sb);
 942 }
 943
 944 int cmd_clone(int argc, const char **argv, const char *prefix)
 945 {
 946         int is_bundle = 0, is_local;
 947         const char *repo_name, *repo, *work_tree, *git_dir;
 948         char *path, *dir, *display_repo = NULL;
 949         int dest_exists;
 950         const struct ref *refs, *remote_head;
 951         const struct ref *remote_head_points_at;
 952         const struct ref *our_head_points_at;
 953         struct ref *mapped_refs;
 954         const struct ref *ref;
 955         struct strbuf key = STRBUF_INIT;
 956         struct strbuf default_refspec = STRBUF_INIT;
 957         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 958         struct transport *transport = NULL;
 959         const char *src_ref_prefix = "refs/heads/";
 960         struct remote *remote;
 961         int err = 0, complete_refs_before_fetch = 1;
 962         int submodule_progress;
 963
 964         struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
 965
 966         packet_trace_identity("clone");
 967         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 968                              builtin_clone_usage, 0);
 969
 970         if (argc > 2)
 971                 usage_msg_opt(_("Too many arguments."),
 972                         builtin_clone_usage, builtin_clone_options);
 973
 974         if (argc == 0)
 975                 usage_msg_opt(_("You must specify a repository to clone."),
 976                         builtin_clone_usage, builtin_clone_options);
 977
 978         if (option_depth || option_since || option_not.nr)
 979                 deepen = 1;
 980         if (option_single_branch == -1)
 981                 option_single_branch = deepen ? 1 : 0;
 982
 983         if (option_mirror)
 984                 option_bare = 1;
 985
 986         if (option_bare) {
 987                 if (option_origin)
 988                         die(_("--bare and --origin %s options are incompatible."),
 989                             option_origin);
 990                 if (real_git_dir)
 991                         die(_("--bare and --separate-git-dir are incompatible."));
 992                 option_no_checkout = 1;
 993         }
 994
 995         if (!option_origin)
 996                 option_origin = "origin";
 997
 998         repo_name = argv[0];
 999
1000         path = get_repo_path(repo_name, &is_bundle);
1001         if (path)
1002                 repo = absolute_pathdup(repo_name);
1003         else if (strchr(repo_name, ':')) {
1004                 repo = repo_name;
1005                 display_repo = transport_anonymize_url(repo);
1006         } else
1007                 die(_("repository '%s' does not exist"), repo_name);
1008
1009         /* no need to be strict, transport_set_option() will validate it again */
1010         if (option_depth && atoi(option_depth) < 1)
1011                 die(_("depth %s is not a positive number"), option_depth);
1012
1013         if (argc == 2)
1014                 dir = xstrdup(argv[1]);
1015         else
1016                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
1017         strip_trailing_slashes(dir);
1018
1019         dest_exists = path_exists(dir);
1020         if (dest_exists && !is_empty_dir(dir))
1021                 die(_("destination path '%s' already exists and is not "
1022                         "an empty directory."), dir);
1023
1024         strbuf_addf(&reflog_msg, "clone: from %s",
1025                     display_repo ? display_repo : repo);
1026         free(display_repo);
1027
1028         if (option_bare)
1029                 work_tree = NULL;
1030         else {
1031                 work_tree = getenv("GIT_WORK_TREE");
1032                 if (work_tree && path_exists(work_tree))
1033                         die(_("working tree '%s' already exists."), work_tree);
1034         }
1035
1036         if (option_bare || work_tree)
1037                 git_dir = xstrdup(dir);
1038         else {
1039                 work_tree = dir;
1040                 git_dir = mkpathdup("%s/.git", dir);
1041         }
1042
1043         atexit(remove_junk);
1044         sigchain_push_common(remove_junk_on_signal);
1045
1046         if (!option_bare) {
1047                 if (safe_create_leading_directories_const(work_tree) < 0)
1048                         die_errno(_("could not create leading directories of '%s'"),
1049                                   work_tree);
1050                 if (dest_exists)
1051                         junk_work_tree_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1052                 else if (mkdir(work_tree, 0777))
1053                         die_errno(_("could not create work tree dir '%s'"),
1054                                   work_tree);
1055                 junk_work_tree = work_tree;
1056                 set_git_work_tree(work_tree);
1057         }
1058
1059         if (real_git_dir) {
1060                 if (path_exists(real_git_dir))
1061                         junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1062                 junk_git_dir = real_git_dir;
1063         } else {
1064                 if (dest_exists)
1065                         junk_git_dir_flags |= REMOVE_DIR_KEEP_TOPLEVEL;
1066                 junk_git_dir = git_dir;
1067         }
1068         if (safe_create_leading_directories_const(git_dir) < 0)
1069                 die(_("could not create leading directories of '%s'"), git_dir);
1070
1071         if (0 <= option_verbosity) {
1072                 if (option_bare)
1073                         fprintf(stderr, _("Cloning into bare repository '%s'...\n"), dir);
1074                 else
1075                         fprintf(stderr, _("Cloning into '%s'...\n"), dir);
1076         }
1077
1078         if (option_recurse_submodules.nr > 0) {
1079                 struct string_list_item *item;
1080                 struct strbuf sb = STRBUF_INIT;
1081
1082                 /* remove duplicates */
1083                 string_list_sort(&option_recurse_submodules);
1084                 string_list_remove_duplicates(&option_recurse_submodules, 0);
1085
1086                 /*
1087                  * NEEDSWORK: In a multi-working-tree world, this needs to be
1088                  * set in the per-worktree config.
1089                  */
1090                 for_each_string_list_item(item, &option_recurse_submodules) {
1091                         strbuf_addf(&sb, "submodule.active=%s",
1092                                     item->string);
1093                         string_list_append(&option_config,
1094                                            strbuf_detach(&sb, NULL));
1095                 }
1096
1097                 if (option_required_reference.nr &&
1098                     option_optional_reference.nr)
1099                         die(_("clone --recursive is not compatible with "
1100                               "both --reference and --reference-if-able"));
1101                 else if (option_required_reference.nr) {
1102                         string_list_append(&option_config,
1103                                 "submodule.alternateLocation=superproject");
1104                         string_list_append(&option_config,
1105                                 "submodule.alternateErrorStrategy=die");
1106                 } else if (option_optional_reference.nr) {
1107                         string_list_append(&option_config,
1108                                 "submodule.alternateLocation=superproject");
1109                         string_list_append(&option_config,
1110                                 "submodule.alternateErrorStrategy=info");
1111                 }
1112         }
1113
1114         init_db(git_dir, real_git_dir, option_template, GIT_HASH_UNKNOWN, NULL,
1115                 INIT_DB_QUIET);
1116
1117         if (real_git_dir)
1118                 git_dir = real_git_dir;
1119
1120         write_config(&option_config);
1121
1122         git_config(git_default_config, NULL);
1123
1124         if (option_bare) {
1125                 if (option_mirror)
1126                         src_ref_prefix = "refs/";
1127                 strbuf_addstr(&branch_top, src_ref_prefix);
1128
1129                 git_config_set("core.bare", "true");
1130         } else {
1131                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
1132         }
1133
1134         strbuf_addf(&key, "remote.%s.url", option_origin);
1135         git_config_set(key.buf, repo);
1136         strbuf_reset(&key);
1137
1138         if (option_no_tags) {
1139                 strbuf_addf(&key, "remote.%s.tagOpt", option_origin);
1140                 git_config_set(key.buf, "--no-tags");
1141                 strbuf_reset(&key);
1142         }
1143
1144         if (option_required_reference.nr || option_optional_reference.nr)
1145                 setup_reference();
1146
1147         if (option_sparse_checkout && git_sparse_checkout_init(dir))
1148                 return 1;
1149
1150         remote = remote_get(option_origin);
1151
1152         strbuf_addf(&default_refspec, "+%s*:%s*", src_ref_prefix,
1153                     branch_top.buf);
1154         refspec_append(&remote->fetch, default_refspec.buf);
1155
1156         transport = transport_get(remote, remote->url[0]);
1157         transport_set_verbosity(transport, option_verbosity, option_progress);
1158         transport->family = family;
1159
1160         path = get_repo_path(remote->url[0], &is_bundle);
1161         is_local = option_local != 0 && path && !is_bundle;
1162         if (is_local) {
1163                 if (option_depth)
1164                         warning(_("--depth is ignored in local clones; use file:// instead."));
1165                 if (option_since)
1166                         warning(_("--shallow-since is ignored in local clones; use file:// instead."));
1167                 if (option_not.nr)
1168                         warning(_("--shallow-exclude is ignored in local clones; use file:// instead."));
1169                 if (filter_options.choice)
1170                         warning(_("--filter is ignored in local clones; use file:// instead."));
1171                 if (!access(mkpath("%s/shallow", path), F_OK)) {
1172                         if (option_local > 0)
1173                                 warning(_("source repository is shallow, ignoring --local"));
1174                         is_local = 0;
1175                 }
1176         }
1177         if (option_local > 0 && !is_local)
1178                 warning(_("--local is ignored"));
1179         transport->cloning = 1;
1180
1181         transport_set_option(transport, TRANS_OPT_KEEP, "yes");
1182
1183         if (option_depth)
1184                 transport_set_option(transport, TRANS_OPT_DEPTH,
1185                                      option_depth);
1186         if (option_since)
1187                 transport_set_option(transport, TRANS_OPT_DEEPEN_SINCE,
1188                                      option_since);
1189         if (option_not.nr)
1190                 transport_set_option(transport, TRANS_OPT_DEEPEN_NOT,
1191                                      (const char *)&option_not);
1192         if (option_single_branch)
1193                 transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1194
1195         if (option_upload_pack)
1196                 transport_set_option(transport, TRANS_OPT_UPLOADPACK,
1197                                      option_upload_pack);
1198
1199         if (server_options.nr)
1200                 transport->server_options = &server_options;
1201
1202         if (filter_options.choice) {
1203                 const char *spec =
1204                         expand_list_objects_filter_spec(&filter_options);
1205                 transport_set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
1206                                      spec);
1207                 transport_set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1208         }
1209
1210         if (transport->smart_options && !deepen && !filter_options.choice)
1211                 transport->smart_options->check_self_contained_and_connected = 1;
1212
1213
1214         argv_array_push(&ref_prefixes, "HEAD");
1215         refspec_ref_prefixes(&remote->fetch, &ref_prefixes);
1216         if (option_branch)
1217                 expand_ref_prefix(&ref_prefixes, option_branch);
1218         if (!option_no_tags)
1219                 argv_array_push(&ref_prefixes, "refs/tags/");
1220
1221         refs = transport_get_remote_refs(transport, &ref_prefixes);
1222
1223         if (refs) {
1224                 int hash_algo = hash_algo_by_ptr(transport_get_hash_algo(transport));
1225
1226                 /*
1227                  * Now that we know what algorithm the remote side is using,
1228                  * let's set ours to the same thing.
1229                  */
1230                 initialize_repository_version(hash_algo);
1231                 repo_set_hash_algo(the_repository, hash_algo);
1232
1233                 mapped_refs = wanted_peer_refs(refs, &remote->fetch);
1234                 /*
1235                  * transport_get_remote_refs() may return refs with null sha-1
1236                  * in mapped_refs (see struct transport->get_refs_list
1237                  * comment). In that case we need fetch it early because
1238                  * remote_head code below relies on it.
1239                  *
1240                  * for normal clones, transport_get_remote_refs() should
1241                  * return reliable ref set, we can delay cloning until after
1242                  * remote HEAD check.
1243                  */
1244                 for (ref = refs; ref; ref = ref->next)
1245                         if (is_null_oid(&ref->old_oid)) {
1246                                 complete_refs_before_fetch = 0;
1247                                 break;
1248                         }
1249
1250                 if (!is_local && !complete_refs_before_fetch)
1251                         transport_fetch_refs(transport, mapped_refs);
1252
1253                 remote_head = find_ref_by_name(refs, "HEAD");
1254                 remote_head_points_at =
1255                         guess_remote_head(remote_head, mapped_refs, 0);
1256
1257                 if (option_branch) {
1258                         our_head_points_at =
1259                                 find_remote_branch(mapped_refs, option_branch);
1260
1261                         if (!our_head_points_at)
1262                                 die(_("Remote branch %s not found in upstream %s"),
1263                                     option_branch, option_origin);
1264                 }
1265                 else
1266                         our_head_points_at = remote_head_points_at;
1267         }
1268         else {
1269                 if (option_branch)
1270                         die(_("Remote branch %s not found in upstream %s"),
1271                                         option_branch, option_origin);
1272
1273                 warning(_("You appear to have cloned an empty repository."));
1274                 mapped_refs = NULL;
1275                 our_head_points_at = NULL;
1276                 remote_head_points_at = NULL;
1277                 remote_head = NULL;
1278                 option_no_checkout = 1;
1279                 if (!option_bare) {
1280                         const char *branch = git_default_branch_name();
1281                         char *ref = xstrfmt("refs/heads/%s", branch);
1282
1283                         install_branch_config(0, branch, option_origin, ref);
1284                         free(ref);
1285                 }
1286         }
1287
1288         write_refspec_config(src_ref_prefix, our_head_points_at,
1289                         remote_head_points_at, &branch_top);
1290
1291         if (filter_options.choice)
1292                 partial_clone_register(option_origin, &filter_options);
1293
1294         if (is_local)
1295                 clone_local(path, git_dir);
1296         else if (refs && complete_refs_before_fetch)
1297                 transport_fetch_refs(transport, mapped_refs);
1298
1299         update_remote_refs(refs, mapped_refs, remote_head_points_at,
1300                            branch_top.buf, reflog_msg.buf, transport,
1301                            !is_local);
1302
1303         update_head(our_head_points_at, remote_head, reflog_msg.buf);
1304
1305         /*
1306          * We want to show progress for recursive submodule clones iff
1307          * we did so for the main clone. But only the transport knows
1308          * the final decision for this flag, so we need to rescue the value
1309          * before we free the transport.
1310          */
1311         submodule_progress = transport->progress;
1312
1313         transport_unlock_pack(transport);
1314         transport_disconnect(transport);
1315
1316         if (option_dissociate) {
1317                 close_object_store(the_repository->objects);
1318                 dissociate_from_references();
1319         }
1320
1321         junk_mode = JUNK_LEAVE_REPO;
1322         err = checkout(submodule_progress);
1323
1324         strbuf_release(&reflog_msg);
1325         strbuf_release(&branch_top);
1326         strbuf_release(&key);
1327         strbuf_release(&default_refspec);
1328         junk_mode = JUNK_LEAVE_ALL;
1329
1330         argv_array_clear(&ref_prefixes);
1331         return err;
1332 }