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 #include "builtin.h"
  12 #include "parse-options.h"
  13 #include "fetch-pack.h"
  14 #include "refs.h"
  15 #include "tree.h"
  16 #include "tree-walk.h"
  17 #include "unpack-trees.h"
  18 #include "transport.h"
  19 #include "strbuf.h"
  20 #include "dir.h"
  21 #include "pack-refs.h"
  22 #include "sigchain.h"
  23 #include "branch.h"
  24 #include "remote.h"
  25 #include "run-command.h"
  26
  27 /*
  28  * Overall FIXMEs:
  29  *  - respect DB_ENVIRONMENT for .git/objects.
  30  *
  31  * Implementation notes:
  32  *  - dropping use-separate-remote and no-separate-remote compatibility
  33  *
  34  */
  35 static const char * const builtin_clone_usage[] = {
  36         "git clone [options] [--] <repo> [<dir>]",
  37         NULL
  38 };
  39
  40 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  41 static int option_local, option_no_hardlinks, option_shared, option_recursive;
  42 static char *option_template, *option_depth;
  43 static char *option_origin = NULL;
  44 static char *option_branch = NULL;
  45 static const char *real_git_dir;
  46 static char *option_upload_pack = "git-upload-pack";
  47 static int option_verbosity;
  48 static int option_progress = -1;
  49 static struct string_list option_config;
  50 static struct string_list option_reference;
  51
  52 static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
  53 {
  54         struct string_list *option_reference = opt->value;
  55         if (!arg)
  56                 return -1;
  57         string_list_append(option_reference, arg);
  58         return 0;
  59 }
  60
  61 static struct option builtin_clone_options[] = {
  62         OPT__VERBOSITY(&option_verbosity),
  63         OPT_BOOL(0, "progress", &option_progress,
  64                  "force progress reporting"),
  65         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  66                     "don't create a checkout"),
  67         OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
  68         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
  69                 "create a bare repository",
  70                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
  71         OPT_BOOLEAN(0, "mirror", &option_mirror,
  72                     "create a mirror repository (implies bare)"),
  73         OPT_BOOLEAN('l', "local", &option_local,
  74                     "to clone from a local repository"),
  75         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  76                     "don't use local hardlinks, always copy"),
  77         OPT_BOOLEAN('s', "shared", &option_shared,
  78                     "setup as shared repository"),
  79         OPT_BOOLEAN(0, "recursive", &option_recursive,
  80                     "initialize submodules in the clone"),
  81         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
  82                     "initialize submodules in the clone"),
  83         OPT_STRING(0, "template", &option_template, "template-directory",
  84                    "directory from which templates will be used"),
  85         OPT_CALLBACK(0 , "reference", &option_reference, "repo",
  86                      "reference repository", &opt_parse_reference),
  87         OPT_STRING('o', "origin", &option_origin, "name",
  88                    "use <name> instead of 'origin' to track upstream"),
  89         OPT_STRING('b', "branch", &option_branch, "branch",
  90                    "checkout <branch> instead of the remote's HEAD"),
  91         OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
  92                    "path to git-upload-pack on the remote"),
  93         OPT_STRING(0, "depth", &option_depth, "depth",
  94                     "create a shallow clone of that depth"),
  95         OPT_BOOL(0, "single-branch", &option_single_branch,
  96                     "clone only one branch, HEAD or --branch"),
  97         OPT_STRING(0, "separate-git-dir", &real_git_dir, "gitdir",
  98                    "separate git dir from working tree"),
  99         OPT_STRING_LIST('c', "config", &option_config, "key=value",
 100                         "set config inside the new repository"),
 101         OPT_END()
 102 };
 103
 104 static const char *argv_submodule[] = {
 105         "submodule", "update", "--init", "--recursive", NULL
 106 };
 107
 108 static char *get_repo_path(const char *repo, int *is_bundle)
 109 {
 110         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 111         static char *bundle_suffix[] = { ".bundle", "" };
 112         struct stat st;
 113         int i;
 114
 115         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 116                 const char *path;
 117                 path = mkpath("%s%s", repo, suffix[i]);
 118                 if (stat(path, &st))
 119                         continue;
 120                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
 121                         *is_bundle = 0;
 122                         return xstrdup(absolute_path(path));
 123                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 124                         /* Is it a "gitfile"? */
 125                         char signature[8];
 126                         int len, fd = open(path, O_RDONLY);
 127                         if (fd < 0)
 128                                 continue;
 129                         len = read_in_full(fd, signature, 8);
 130                         close(fd);
 131                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 132                                 continue;
 133                         path = read_gitfile(path);
 134                         if (path) {
 135                                 *is_bundle = 0;
 136                                 return xstrdup(absolute_path(path));
 137                         }
 138                 }
 139         }
 140
 141         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 142                 const char *path;
 143                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 144                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 145                         *is_bundle = 1;
 146                         return xstrdup(absolute_path(path));
 147                 }
 148         }
 149
 150         return NULL;
 151 }
 152
 153 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 154 {
 155         const char *end = repo + strlen(repo), *start;
 156         char *dir;
 157
 158         /*
 159          * Strip trailing spaces, slashes and /.git
 160          */
 161         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 162                 end--;
 163         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 164             !strncmp(end - 4, ".git", 4)) {
 165                 end -= 5;
 166                 while (repo < end && is_dir_sep(end[-1]))
 167                         end--;
 168         }
 169
 170         /*
 171          * Find last component, but be prepared that repo could have
 172          * the form  "remote.example.com:foo.git", i.e. no slash
 173          * in the directory part.
 174          */
 175         start = end;
 176         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 177                 start--;
 178
 179         /*
 180          * Strip .{bundle,git}.
 181          */
 182         if (is_bundle) {
 183                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 184                         end -= 7;
 185         } else {
 186                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 187                         end -= 4;
 188         }
 189
 190         if (is_bare) {
 191                 struct strbuf result = STRBUF_INIT;
 192                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 193                 dir = strbuf_detach(&result, NULL);
 194         } else
 195                 dir = xstrndup(start, end - start);
 196         /*
 197          * Replace sequences of 'control' characters and whitespace
 198          * with one ascii space, remove leading and trailing spaces.
 199          */
 200         if (*dir) {
 201                 char *out = dir;
 202                 int prev_space = 1 /* strip leading whitespace */;
 203                 for (end = dir; *end; ++end) {
 204                         char ch = *end;
 205                         if ((unsigned char)ch < '\x20')
 206                                 ch = '\x20';
 207                         if (isspace(ch)) {
 208                                 if (prev_space)
 209                                         continue;
 210                                 prev_space = 1;
 211                         } else
 212                                 prev_space = 0;
 213                         *out++ = ch;
 214                 }
 215                 *out = '\0';
 216                 if (out > dir && prev_space)
 217                         out[-1] = '\0';
 218         }
 219         return dir;
 220 }
 221
 222 static void strip_trailing_slashes(char *dir)
 223 {
 224         char *end = dir + strlen(dir);
 225
 226         while (dir < end - 1 && is_dir_sep(end[-1]))
 227                 end--;
 228         *end = '\0';
 229 }
 230
 231 static int add_one_reference(struct string_list_item *item, void *cb_data)
 232 {
 233         char *ref_git;
 234         struct strbuf alternate = STRBUF_INIT;
 235
 236         /* Beware: real_path() and mkpath() return static buffer */
 237         ref_git = xstrdup(real_path(item->string));
 238         if (is_directory(mkpath("%s/.git/objects", ref_git))) {
 239                 char *ref_git_git = xstrdup(mkpath("%s/.git", ref_git));
 240                 free(ref_git);
 241                 ref_git = ref_git_git;
 242         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 243                 die(_("reference repository '%s' is not a local directory."),
 244                     item->string);
 245
 246         strbuf_addf(&alternate, "%s/objects", ref_git);
 247         add_to_alternates_file(alternate.buf);
 248         strbuf_release(&alternate);
 249         free(ref_git);
 250         return 0;
 251 }
 252
 253 static void setup_reference(void)
 254 {
 255         for_each_string_list(&option_reference, add_one_reference, NULL);
 256 }
 257
 258 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 259                             const char *src_repo)
 260 {
 261         /*
 262          * Read from the source objects/info/alternates file
 263          * and copy the entries to corresponding file in the
 264          * destination repository with add_to_alternates_file().
 265          * Both src and dst have "$path/objects/info/alternates".
 266          *
 267          * Instead of copying bit-for-bit from the original,
 268          * we need to append to existing one so that the already
 269          * created entry via "clone -s" is not lost, and also
 270          * to turn entries with paths relative to the original
 271          * absolute, so that they can be used in the new repository.
 272          */
 273         FILE *in = fopen(src->buf, "r");
 274         struct strbuf line = STRBUF_INIT;
 275
 276         while (strbuf_getline(&line, in, '\n') != EOF) {
 277                 char *abs_path, abs_buf[PATH_MAX];
 278                 if (!line.len || line.buf[0] == '#')
 279                         continue;
 280                 if (is_absolute_path(line.buf)) {
 281                         add_to_alternates_file(line.buf);
 282                         continue;
 283                 }
 284                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
 285                 normalize_path_copy(abs_buf, abs_path);
 286                 add_to_alternates_file(abs_buf);
 287         }
 288         strbuf_release(&line);
 289         fclose(in);
 290 }
 291
 292 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 293                                    const char *src_repo, int src_baselen)
 294 {
 295         struct dirent *de;
 296         struct stat buf;
 297         int src_len, dest_len;
 298         DIR *dir;
 299
 300         dir = opendir(src->buf);
 301         if (!dir)
 302                 die_errno(_("failed to open '%s'"), src->buf);
 303
 304         if (mkdir(dest->buf, 0777)) {
 305                 if (errno != EEXIST)
 306                         die_errno(_("failed to create directory '%s'"), dest->buf);
 307                 else if (stat(dest->buf, &buf))
 308                         die_errno(_("failed to stat '%s'"), dest->buf);
 309                 else if (!S_ISDIR(buf.st_mode))
 310                         die(_("%s exists and is not a directory"), dest->buf);
 311         }
 312
 313         strbuf_addch(src, '/');
 314         src_len = src->len;
 315         strbuf_addch(dest, '/');
 316         dest_len = dest->len;
 317
 318         while ((de = readdir(dir)) != NULL) {
 319                 strbuf_setlen(src, src_len);
 320                 strbuf_addstr(src, de->d_name);
 321                 strbuf_setlen(dest, dest_len);
 322                 strbuf_addstr(dest, de->d_name);
 323                 if (stat(src->buf, &buf)) {
 324                         warning (_("failed to stat %s\n"), src->buf);
 325                         continue;
 326                 }
 327                 if (S_ISDIR(buf.st_mode)) {
 328                         if (de->d_name[0] != '.')
 329                                 copy_or_link_directory(src, dest,
 330                                                        src_repo, src_baselen);
 331                         continue;
 332                 }
 333
 334                 /* Files that cannot be copied bit-for-bit... */
 335                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 336                         copy_alternates(src, dest, src_repo);
 337                         continue;
 338                 }
 339
 340                 if (unlink(dest->buf) && errno != ENOENT)
 341                         die_errno(_("failed to unlink '%s'"), dest->buf);
 342                 if (!option_no_hardlinks) {
 343                         if (!link(src->buf, dest->buf))
 344                                 continue;
 345                         if (option_local)
 346                                 die_errno(_("failed to create link '%s'"), dest->buf);
 347                         option_no_hardlinks = 1;
 348                 }
 349                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 350                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 351         }
 352         closedir(dir);
 353 }
 354
 355 static void clone_local(const char *src_repo, const char *dest_repo)
 356 {
 357         if (option_shared) {
 358                 struct strbuf alt = STRBUF_INIT;
 359                 strbuf_addf(&alt, "%s/objects", src_repo);
 360                 add_to_alternates_file(alt.buf);
 361                 strbuf_release(&alt);
 362         } else {
 363                 struct strbuf src = STRBUF_INIT;
 364                 struct strbuf dest = STRBUF_INIT;
 365                 strbuf_addf(&src, "%s/objects", src_repo);
 366                 strbuf_addf(&dest, "%s/objects", dest_repo);
 367                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 368                 strbuf_release(&src);
 369                 strbuf_release(&dest);
 370         }
 371
 372         if (0 <= option_verbosity)
 373                 printf(_("done.\n"));
 374 }
 375
 376 static const char *junk_work_tree;
 377 static const char *junk_git_dir;
 378 static pid_t junk_pid;
 379
 380 static void remove_junk(void)
 381 {
 382         struct strbuf sb = STRBUF_INIT;
 383         if (getpid() != junk_pid)
 384                 return;
 385         if (junk_git_dir) {
 386                 strbuf_addstr(&sb, junk_git_dir);
 387                 remove_dir_recursively(&sb, 0);
 388                 strbuf_reset(&sb);
 389         }
 390         if (junk_work_tree) {
 391                 strbuf_addstr(&sb, junk_work_tree);
 392                 remove_dir_recursively(&sb, 0);
 393                 strbuf_reset(&sb);
 394         }
 395 }
 396
 397 static void remove_junk_on_signal(int signo)
 398 {
 399         remove_junk();
 400         sigchain_pop(signo);
 401         raise(signo);
 402 }
 403
 404 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 405 {
 406         struct ref *ref;
 407         struct strbuf head = STRBUF_INIT;
 408         strbuf_addstr(&head, "refs/heads/");
 409         strbuf_addstr(&head, branch);
 410         ref = find_ref_by_name(refs, head.buf);
 411         strbuf_release(&head);
 412
 413         if (ref)
 414                 return ref;
 415
 416         strbuf_addstr(&head, "refs/tags/");
 417         strbuf_addstr(&head, branch);
 418         ref = find_ref_by_name(refs, head.buf);
 419         strbuf_release(&head);
 420
 421         return ref;
 422 }
 423
 424 static struct ref *wanted_peer_refs(const struct ref *refs,
 425                 struct refspec *refspec)
 426 {
 427         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 428         struct ref *local_refs = head;
 429         struct ref **tail = head ? &head->next : &local_refs;
 430
 431         if (option_single_branch) {
 432                 struct ref *remote_head = NULL;
 433
 434                 if (!option_branch)
 435                         remote_head = guess_remote_head(head, refs, 0);
 436                 else {
 437                         local_refs = NULL;
 438                         tail = &local_refs;
 439                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 440                 }
 441
 442                 if (!remote_head && option_branch)
 443                         warning(_("Could not find remote branch %s to clone."),
 444                                 option_branch);
 445                 else {
 446                         get_fetch_map(remote_head, refspec, &tail, 0);
 447
 448                         /* if --branch=tag, pull the requested tag explicitly */
 449                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 450                 }
 451         } else
 452                 get_fetch_map(refs, refspec, &tail, 0);
 453
 454         if (!option_mirror && !option_single_branch)
 455                 get_fetch_map(refs, tag_refspec, &tail, 0);
 456
 457         return local_refs;
 458 }
 459
 460 static void write_remote_refs(const struct ref *local_refs)
 461 {
 462         const struct ref *r;
 463
 464         for (r = local_refs; r; r = r->next) {
 465                 if (!r->peer_ref)
 466                         continue;
 467                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 468         }
 469
 470         pack_refs(PACK_REFS_ALL);
 471 }
 472
 473 static void write_followtags(const struct ref *refs, const char *msg)
 474 {
 475         const struct ref *ref;
 476         for (ref = refs; ref; ref = ref->next) {
 477                 if (prefixcmp(ref->name, "refs/tags/"))
 478                         continue;
 479                 if (!suffixcmp(ref->name, "^{}"))
 480                         continue;
 481                 if (!has_sha1_file(ref->old_sha1))
 482                         continue;
 483                 update_ref(msg, ref->name, ref->old_sha1,
 484                            NULL, 0, DIE_ON_ERR);
 485         }
 486 }
 487
 488 static void update_remote_refs(const struct ref *refs,
 489                                const struct ref *mapped_refs,
 490                                const struct ref *remote_head_points_at,
 491                                const char *branch_top,
 492                                const char *msg)
 493 {
 494         if (refs) {
 495                 write_remote_refs(mapped_refs);
 496                 if (option_single_branch)
 497                         write_followtags(refs, msg);
 498         }
 499
 500         if (remote_head_points_at && !option_bare) {
 501                 struct strbuf head_ref = STRBUF_INIT;
 502                 strbuf_addstr(&head_ref, branch_top);
 503                 strbuf_addstr(&head_ref, "HEAD");
 504                 create_symref(head_ref.buf,
 505                               remote_head_points_at->peer_ref->name,
 506                               msg);
 507         }
 508 }
 509
 510 static void update_head(const struct ref *our, const struct ref *remote,
 511                         const char *msg)
 512 {
 513         if (our && !prefixcmp(our->name, "refs/heads/")) {
 514                 /* Local default branch link */
 515                 create_symref("HEAD", our->name, NULL);
 516                 if (!option_bare) {
 517                         const char *head = skip_prefix(our->name, "refs/heads/");
 518                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 519                         install_branch_config(0, head, option_origin, our->name);
 520                 }
 521         } else if (our) {
 522                 struct commit *c = lookup_commit_reference(our->old_sha1);
 523                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 524                 update_ref(msg, "HEAD", c->object.sha1,
 525                            NULL, REF_NODEREF, DIE_ON_ERR);
 526         } else if (remote) {
 527                 /*
 528                  * We know remote HEAD points to a non-branch, or
 529                  * HEAD points to a branch but we don't know which one.
 530                  * Detach HEAD in all these cases.
 531                  */
 532                 update_ref(msg, "HEAD", remote->old_sha1,
 533                            NULL, REF_NODEREF, DIE_ON_ERR);
 534         }
 535 }
 536
 537 static int checkout(void)
 538 {
 539         unsigned char sha1[20];
 540         char *head;
 541         struct lock_file *lock_file;
 542         struct unpack_trees_options opts;
 543         struct tree *tree;
 544         struct tree_desc t;
 545         int err = 0, fd;
 546
 547         if (option_no_checkout)
 548                 return 0;
 549
 550         head = resolve_refdup("HEAD", sha1, 1, NULL);
 551         if (!head) {
 552                 warning(_("remote HEAD refers to nonexistent ref, "
 553                           "unable to checkout.\n"));
 554                 return 0;
 555         }
 556         if (!strcmp(head, "HEAD")) {
 557                 if (advice_detached_head)
 558                         detach_advice(sha1_to_hex(sha1));
 559         } else {
 560                 if (prefixcmp(head, "refs/heads/"))
 561                         die(_("HEAD not found below refs/heads!"));
 562         }
 563         free(head);
 564
 565         /* We need to be in the new work tree for the checkout */
 566         setup_work_tree();
 567
 568         lock_file = xcalloc(1, sizeof(struct lock_file));
 569         fd = hold_locked_index(lock_file, 1);
 570
 571         memset(&opts, 0, sizeof opts);
 572         opts.update = 1;
 573         opts.merge = 1;
 574         opts.fn = oneway_merge;
 575         opts.verbose_update = (option_verbosity >= 0);
 576         opts.src_index = &the_index;
 577         opts.dst_index = &the_index;
 578
 579         tree = parse_tree_indirect(sha1);
 580         parse_tree(tree);
 581         init_tree_desc(&t, tree->buffer, tree->size);
 582         unpack_trees(1, &t, &opts);
 583
 584         if (write_cache(fd, active_cache, active_nr) ||
 585             commit_locked_index(lock_file))
 586                 die(_("unable to write new index file"));
 587
 588         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 589                         sha1_to_hex(sha1), "1", NULL);
 590
 591         if (!err && option_recursive)
 592                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 593
 594         return err;
 595 }
 596
 597 static int write_one_config(const char *key, const char *value, void *data)
 598 {
 599         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 600 }
 601
 602 static void write_config(struct string_list *config)
 603 {
 604         int i;
 605
 606         for (i = 0; i < config->nr; i++) {
 607                 if (git_config_parse_parameter(config->items[i].string,
 608                                                write_one_config, NULL) < 0)
 609                         die("unable to write parameters to config file");
 610         }
 611 }
 612
 613 int cmd_clone(int argc, const char **argv, const char *prefix)
 614 {
 615         int is_bundle = 0, is_local;
 616         struct stat buf;
 617         const char *repo_name, *repo, *work_tree, *git_dir;
 618         char *path, *dir;
 619         int dest_exists;
 620         const struct ref *refs, *remote_head;
 621         const struct ref *remote_head_points_at;
 622         const struct ref *our_head_points_at;
 623         struct ref *mapped_refs;
 624         const struct ref *ref;
 625         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 626         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 627         struct transport *transport = NULL;
 628         const char *src_ref_prefix = "refs/heads/";
 629         struct remote *remote;
 630         int err = 0, complete_refs_before_fetch = 1;
 631
 632         struct refspec *refspec;
 633         const char *fetch_pattern;
 634
 635         junk_pid = getpid();
 636
 637         packet_trace_identity("clone");
 638         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 639                              builtin_clone_usage, 0);
 640
 641         if (argc > 2)
 642                 usage_msg_opt(_("Too many arguments."),
 643                         builtin_clone_usage, builtin_clone_options);
 644
 645         if (argc == 0)
 646                 usage_msg_opt(_("You must specify a repository to clone."),
 647                         builtin_clone_usage, builtin_clone_options);
 648
 649         if (option_single_branch == -1)
 650                 option_single_branch = option_depth ? 1 : 0;
 651
 652         if (option_mirror)
 653                 option_bare = 1;
 654
 655         if (option_bare) {
 656                 if (option_origin)
 657                         die(_("--bare and --origin %s options are incompatible."),
 658                             option_origin);
 659                 option_no_checkout = 1;
 660         }
 661
 662         if (!option_origin)
 663                 option_origin = "origin";
 664
 665         repo_name = argv[0];
 666
 667         path = get_repo_path(repo_name, &is_bundle);
 668         if (path)
 669                 repo = xstrdup(absolute_path(repo_name));
 670         else if (!strchr(repo_name, ':'))
 671                 die(_("repository '%s' does not exist"), repo_name);
 672         else
 673                 repo = repo_name;
 674         is_local = path && !is_bundle;
 675         if (is_local && option_depth)
 676                 warning(_("--depth is ignored in local clones; use file:// instead."));
 677
 678         if (argc == 2)
 679                 dir = xstrdup(argv[1]);
 680         else
 681                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 682         strip_trailing_slashes(dir);
 683
 684         dest_exists = !stat(dir, &buf);
 685         if (dest_exists && !is_empty_dir(dir))
 686                 die(_("destination path '%s' already exists and is not "
 687                         "an empty directory."), dir);
 688
 689         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 690
 691         if (option_bare)
 692                 work_tree = NULL;
 693         else {
 694                 work_tree = getenv("GIT_WORK_TREE");
 695                 if (work_tree && !stat(work_tree, &buf))
 696                         die(_("working tree '%s' already exists."), work_tree);
 697         }
 698
 699         if (option_bare || work_tree)
 700                 git_dir = xstrdup(dir);
 701         else {
 702                 work_tree = dir;
 703                 git_dir = xstrdup(mkpath("%s/.git", dir));
 704         }
 705
 706         if (!option_bare) {
 707                 junk_work_tree = work_tree;
 708                 if (safe_create_leading_directories_const(work_tree) < 0)
 709                         die_errno(_("could not create leading directories of '%s'"),
 710                                   work_tree);
 711                 if (!dest_exists && mkdir(work_tree, 0777))
 712                         die_errno(_("could not create work tree dir '%s'."),
 713                                   work_tree);
 714                 set_git_work_tree(work_tree);
 715         }
 716         junk_git_dir = git_dir;
 717         atexit(remove_junk);
 718         sigchain_push_common(remove_junk_on_signal);
 719
 720         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
 721
 722         if (safe_create_leading_directories_const(git_dir) < 0)
 723                 die(_("could not create leading directories of '%s'"), git_dir);
 724
 725         set_git_dir_init(git_dir, real_git_dir, 0);
 726         if (real_git_dir)
 727                 git_dir = real_git_dir;
 728
 729         if (0 <= option_verbosity) {
 730                 if (option_bare)
 731                         printf(_("Cloning into bare repository '%s'...\n"), dir);
 732                 else
 733                         printf(_("Cloning into '%s'...\n"), dir);
 734         }
 735         init_db(option_template, INIT_DB_QUIET);
 736         write_config(&option_config);
 737
 738         /*
 739          * At this point, the config exists, so we do not need the
 740          * environment variable.  We actually need to unset it, too, to
 741          * re-enable parsing of the global configs.
 742          */
 743         unsetenv(CONFIG_ENVIRONMENT);
 744
 745         git_config(git_default_config, NULL);
 746
 747         if (option_bare) {
 748                 if (option_mirror)
 749                         src_ref_prefix = "refs/";
 750                 strbuf_addstr(&branch_top, src_ref_prefix);
 751
 752                 git_config_set("core.bare", "true");
 753         } else {
 754                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 755         }
 756
 757         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 758
 759         if (option_mirror || !option_bare) {
 760                 /* Configure the remote */
 761                 strbuf_addf(&key, "remote.%s.fetch", option_origin);
 762                 git_config_set_multivar(key.buf, value.buf, "^$", 0);
 763                 strbuf_reset(&key);
 764
 765                 if (option_mirror) {
 766                         strbuf_addf(&key, "remote.%s.mirror", option_origin);
 767                         git_config_set(key.buf, "true");
 768                         strbuf_reset(&key);
 769                 }
 770         }
 771
 772         strbuf_addf(&key, "remote.%s.url", option_origin);
 773         git_config_set(key.buf, repo);
 774         strbuf_reset(&key);
 775
 776         if (option_reference.nr)
 777                 setup_reference();
 778
 779         fetch_pattern = value.buf;
 780         refspec = parse_fetch_refspec(1, &fetch_pattern);
 781
 782         strbuf_reset(&value);
 783
 784         remote = remote_get(option_origin);
 785         transport = transport_get(remote, remote->url[0]);
 786
 787         if (!is_local) {
 788                 if (!transport->get_refs_list || !transport->fetch)
 789                         die(_("Don't know how to clone %s"), transport->url);
 790
 791                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 792
 793                 if (option_depth)
 794                         transport_set_option(transport, TRANS_OPT_DEPTH,
 795                                              option_depth);
 796                 if (option_single_branch)
 797                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 798
 799                 transport_set_verbosity(transport, option_verbosity, option_progress);
 800
 801                 if (option_upload_pack)
 802                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 803                                              option_upload_pack);
 804         }
 805
 806         refs = transport_get_remote_refs(transport);
 807
 808         if (refs) {
 809                 mapped_refs = wanted_peer_refs(refs, refspec);
 810                 /*
 811                  * transport_get_remote_refs() may return refs with null sha-1
 812                  * in mapped_refs (see struct transport->get_refs_list
 813                  * comment). In that case we need fetch it early because
 814                  * remote_head code below relies on it.
 815                  *
 816                  * for normal clones, transport_get_remote_refs() should
 817                  * return reliable ref set, we can delay cloning until after
 818                  * remote HEAD check.
 819                  */
 820                 for (ref = refs; ref; ref = ref->next)
 821                         if (is_null_sha1(ref->old_sha1)) {
 822                                 complete_refs_before_fetch = 0;
 823                                 break;
 824                         }
 825
 826                 if (!is_local && !complete_refs_before_fetch)
 827                         transport_fetch_refs(transport, mapped_refs);
 828
 829                 remote_head = find_ref_by_name(refs, "HEAD");
 830                 remote_head_points_at =
 831                         guess_remote_head(remote_head, mapped_refs, 0);
 832
 833                 if (option_branch) {
 834                         our_head_points_at =
 835                                 find_remote_branch(mapped_refs, option_branch);
 836
 837                         if (!our_head_points_at)
 838                                 die(_("Remote branch %s not found in upstream %s"),
 839                                     option_branch, option_origin);
 840                 }
 841                 else
 842                         our_head_points_at = remote_head_points_at;
 843         }
 844         else {
 845                 warning(_("You appear to have cloned an empty repository."));
 846                 mapped_refs = NULL;
 847                 our_head_points_at = NULL;
 848                 remote_head_points_at = NULL;
 849                 remote_head = NULL;
 850                 option_no_checkout = 1;
 851                 if (!option_bare)
 852                         install_branch_config(0, "master", option_origin,
 853                                               "refs/heads/master");
 854         }
 855
 856         if (is_local)
 857                 clone_local(path, git_dir);
 858         else if (refs && complete_refs_before_fetch)
 859                 transport_fetch_refs(transport, mapped_refs);
 860
 861         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 862                            branch_top.buf, reflog_msg.buf);
 863
 864         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 865
 866         transport_unlock_pack(transport);
 867         transport_disconnect(transport);
 868
 869         err = checkout();
 870
 871         strbuf_release(&reflog_msg);
 872         strbuf_release(&branch_top);
 873         strbuf_release(&key);
 874         strbuf_release(&value);
 875         junk_pid = 0;
 876         return err;
 877 }