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;
  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_BOOLEAN(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", "" };
 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)) {
 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         struct remote *remote;
 236         struct transport *transport;
 237         const struct ref *extra;
 238
 239         /* Beware: real_path() and mkpath() return static buffer */
 240         ref_git = xstrdup(real_path(item->string));
 241         if (is_directory(mkpath("%s/.git/objects", ref_git))) {
 242                 char *ref_git_git = xstrdup(mkpath("%s/.git", ref_git));
 243                 free(ref_git);
 244                 ref_git = ref_git_git;
 245         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 246                 die(_("reference repository '%s' is not a local directory."),
 247                     item->string);
 248
 249         strbuf_addf(&alternate, "%s/objects", ref_git);
 250         add_to_alternates_file(alternate.buf);
 251         strbuf_release(&alternate);
 252
 253         remote = remote_get(ref_git);
 254         transport = transport_get(remote, ref_git);
 255         for (extra = transport_get_remote_refs(transport); extra;
 256              extra = extra->next)
 257                 add_extra_ref(extra->name, extra->old_sha1, 0);
 258
 259         transport_disconnect(transport);
 260         free(ref_git);
 261         return 0;
 262 }
 263
 264 static void setup_reference(void)
 265 {
 266         for_each_string_list(&option_reference, add_one_reference, NULL);
 267 }
 268
 269 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 270                             const char *src_repo)
 271 {
 272         /*
 273          * Read from the source objects/info/alternates file
 274          * and copy the entries to corresponding file in the
 275          * destination repository with add_to_alternates_file().
 276          * Both src and dst have "$path/objects/info/alternates".
 277          *
 278          * Instead of copying bit-for-bit from the original,
 279          * we need to append to existing one so that the already
 280          * created entry via "clone -s" is not lost, and also
 281          * to turn entries with paths relative to the original
 282          * absolute, so that they can be used in the new repository.
 283          */
 284         FILE *in = fopen(src->buf, "r");
 285         struct strbuf line = STRBUF_INIT;
 286
 287         while (strbuf_getline(&line, in, '\n') != EOF) {
 288                 char *abs_path, abs_buf[PATH_MAX];
 289                 if (!line.len || line.buf[0] == '#')
 290                         continue;
 291                 if (is_absolute_path(line.buf)) {
 292                         add_to_alternates_file(line.buf);
 293                         continue;
 294                 }
 295                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
 296                 normalize_path_copy(abs_buf, abs_path);
 297                 add_to_alternates_file(abs_buf);
 298         }
 299         strbuf_release(&line);
 300         fclose(in);
 301 }
 302
 303 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 304                                    const char *src_repo, int src_baselen)
 305 {
 306         struct dirent *de;
 307         struct stat buf;
 308         int src_len, dest_len;
 309         DIR *dir;
 310
 311         dir = opendir(src->buf);
 312         if (!dir)
 313                 die_errno(_("failed to open '%s'"), src->buf);
 314
 315         if (mkdir(dest->buf, 0777)) {
 316                 if (errno != EEXIST)
 317                         die_errno(_("failed to create directory '%s'"), dest->buf);
 318                 else if (stat(dest->buf, &buf))
 319                         die_errno(_("failed to stat '%s'"), dest->buf);
 320                 else if (!S_ISDIR(buf.st_mode))
 321                         die(_("%s exists and is not a directory"), dest->buf);
 322         }
 323
 324         strbuf_addch(src, '/');
 325         src_len = src->len;
 326         strbuf_addch(dest, '/');
 327         dest_len = dest->len;
 328
 329         while ((de = readdir(dir)) != NULL) {
 330                 strbuf_setlen(src, src_len);
 331                 strbuf_addstr(src, de->d_name);
 332                 strbuf_setlen(dest, dest_len);
 333                 strbuf_addstr(dest, de->d_name);
 334                 if (stat(src->buf, &buf)) {
 335                         warning (_("failed to stat %s\n"), src->buf);
 336                         continue;
 337                 }
 338                 if (S_ISDIR(buf.st_mode)) {
 339                         if (de->d_name[0] != '.')
 340                                 copy_or_link_directory(src, dest,
 341                                                        src_repo, src_baselen);
 342                         continue;
 343                 }
 344
 345                 /* Files that cannot be copied bit-for-bit... */
 346                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 347                         copy_alternates(src, dest, src_repo);
 348                         continue;
 349                 }
 350
 351                 if (unlink(dest->buf) && errno != ENOENT)
 352                         die_errno(_("failed to unlink '%s'"), dest->buf);
 353                 if (!option_no_hardlinks) {
 354                         if (!link(src->buf, dest->buf))
 355                                 continue;
 356                         if (option_local)
 357                                 die_errno(_("failed to create link '%s'"), dest->buf);
 358                         option_no_hardlinks = 1;
 359                 }
 360                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 361                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 362         }
 363         closedir(dir);
 364 }
 365
 366 static void clone_local(const char *src_repo, const char *dest_repo)
 367 {
 368         if (option_shared) {
 369                 struct strbuf alt = STRBUF_INIT;
 370                 strbuf_addf(&alt, "%s/objects", src_repo);
 371                 add_to_alternates_file(alt.buf);
 372                 strbuf_release(&alt);
 373         } else {
 374                 struct strbuf src = STRBUF_INIT;
 375                 struct strbuf dest = STRBUF_INIT;
 376                 strbuf_addf(&src, "%s/objects", src_repo);
 377                 strbuf_addf(&dest, "%s/objects", dest_repo);
 378                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 379                 strbuf_release(&src);
 380                 strbuf_release(&dest);
 381         }
 382
 383         if (0 <= option_verbosity)
 384                 printf(_("done.\n"));
 385 }
 386
 387 static const char *junk_work_tree;
 388 static const char *junk_git_dir;
 389 static pid_t junk_pid;
 390
 391 static void remove_junk(void)
 392 {
 393         struct strbuf sb = STRBUF_INIT;
 394         if (getpid() != junk_pid)
 395                 return;
 396         if (junk_git_dir) {
 397                 strbuf_addstr(&sb, junk_git_dir);
 398                 remove_dir_recursively(&sb, 0);
 399                 strbuf_reset(&sb);
 400         }
 401         if (junk_work_tree) {
 402                 strbuf_addstr(&sb, junk_work_tree);
 403                 remove_dir_recursively(&sb, 0);
 404                 strbuf_reset(&sb);
 405         }
 406 }
 407
 408 static void remove_junk_on_signal(int signo)
 409 {
 410         remove_junk();
 411         sigchain_pop(signo);
 412         raise(signo);
 413 }
 414
 415 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 416 {
 417         struct ref *ref;
 418         struct strbuf head = STRBUF_INIT;
 419         strbuf_addstr(&head, "refs/heads/");
 420         strbuf_addstr(&head, branch);
 421         ref = find_ref_by_name(refs, head.buf);
 422         strbuf_release(&head);
 423         return ref;
 424 }
 425
 426 static struct ref *wanted_peer_refs(const struct ref *refs,
 427                 struct refspec *refspec)
 428 {
 429         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 430         struct ref *local_refs = head;
 431         struct ref **tail = head ? &head->next : &local_refs;
 432
 433         if (option_single_branch) {
 434                 struct ref *remote_head = NULL;
 435
 436                 if (!option_branch)
 437                         remote_head = guess_remote_head(head, refs, 0);
 438                 else
 439                         remote_head = find_remote_branch(refs, option_branch);
 440
 441                 if (!remote_head && option_branch)
 442                         warning(_("Could not find remote branch %s to clone."),
 443                                 option_branch);
 444                 else
 445                         get_fetch_map(remote_head, refspec, &tail, 0);
 446         } else
 447                 get_fetch_map(refs, refspec, &tail, 0);
 448
 449         if (!option_mirror && !option_single_branch)
 450                 get_fetch_map(refs, tag_refspec, &tail, 0);
 451
 452         return local_refs;
 453 }
 454
 455 static void write_remote_refs(const struct ref *local_refs)
 456 {
 457         const struct ref *r;
 458
 459         for (r = local_refs; r; r = r->next) {
 460                 if (!r->peer_ref)
 461                         continue;
 462                 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
 463         }
 464
 465         pack_refs(PACK_REFS_ALL);
 466         clear_extra_refs();
 467 }
 468
 469 static void write_followtags(const struct ref *refs, const char *msg)
 470 {
 471         const struct ref *ref;
 472         for (ref = refs; ref; ref = ref->next) {
 473                 if (prefixcmp(ref->name, "refs/tags/"))
 474                         continue;
 475                 if (!suffixcmp(ref->name, "^{}"))
 476                         continue;
 477                 if (!has_sha1_file(ref->old_sha1))
 478                         continue;
 479                 update_ref(msg, ref->name, ref->old_sha1,
 480                            NULL, 0, DIE_ON_ERR);
 481         }
 482 }
 483
 484 static void update_remote_refs(const struct ref *refs,
 485                                const struct ref *mapped_refs,
 486                                const struct ref *remote_head_points_at,
 487                                const char *branch_top,
 488                                const char *msg)
 489 {
 490         if (refs) {
 491                 clear_extra_refs();
 492                 write_remote_refs(mapped_refs);
 493                 if (option_single_branch)
 494                         write_followtags(refs, msg);
 495         }
 496
 497         if (remote_head_points_at && !option_bare) {
 498                 struct strbuf head_ref = STRBUF_INIT;
 499                 strbuf_addstr(&head_ref, branch_top);
 500                 strbuf_addstr(&head_ref, "HEAD");
 501                 create_symref(head_ref.buf,
 502                               remote_head_points_at->peer_ref->name,
 503                               msg);
 504         }
 505 }
 506
 507 static void update_head(const struct ref *our, const struct ref *remote,
 508                         const char *msg)
 509 {
 510         if (our && !prefixcmp(our->name, "refs/heads/")) {
 511                 /* Local default branch link */
 512                 create_symref("HEAD", our->name, NULL);
 513                 if (!option_bare) {
 514                         const char *head = skip_prefix(our->name, "refs/heads/");
 515                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 516                         install_branch_config(0, head, option_origin, our->name);
 517                 }
 518         } else if (remote) {
 519                 /*
 520                  * We know remote HEAD points to a non-branch, or
 521                  * HEAD points to a branch but we don't know which one, or
 522                  * we asked for a specific branch but it did not exist.
 523                  * Detach HEAD in all these cases.
 524                  */
 525                 update_ref(msg, "HEAD", remote->old_sha1,
 526                            NULL, REF_NODEREF, DIE_ON_ERR);
 527         }
 528 }
 529
 530 static int checkout(void)
 531 {
 532         unsigned char sha1[20];
 533         char *head;
 534         struct lock_file *lock_file;
 535         struct unpack_trees_options opts;
 536         struct tree *tree;
 537         struct tree_desc t;
 538         int err = 0, fd;
 539
 540         if (option_no_checkout)
 541                 return 0;
 542
 543         head = resolve_refdup("HEAD", sha1, 1, NULL);
 544         if (!head) {
 545                 warning(_("remote HEAD refers to nonexistent ref, "
 546                           "unable to checkout.\n"));
 547                 return 0;
 548         }
 549         if (strcmp(head, "HEAD")) {
 550                 if (prefixcmp(head, "refs/heads/"))
 551                         die(_("HEAD not found below refs/heads!"));
 552         }
 553         free(head);
 554
 555         /* We need to be in the new work tree for the checkout */
 556         setup_work_tree();
 557
 558         lock_file = xcalloc(1, sizeof(struct lock_file));
 559         fd = hold_locked_index(lock_file, 1);
 560
 561         memset(&opts, 0, sizeof opts);
 562         opts.update = 1;
 563         opts.merge = 1;
 564         opts.fn = oneway_merge;
 565         opts.verbose_update = (option_verbosity > 0);
 566         opts.src_index = &the_index;
 567         opts.dst_index = &the_index;
 568
 569         tree = parse_tree_indirect(sha1);
 570         parse_tree(tree);
 571         init_tree_desc(&t, tree->buffer, tree->size);
 572         unpack_trees(1, &t, &opts);
 573
 574         if (write_cache(fd, active_cache, active_nr) ||
 575             commit_locked_index(lock_file))
 576                 die(_("unable to write new index file"));
 577
 578         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 579                         sha1_to_hex(sha1), "1", NULL);
 580
 581         if (!err && option_recursive)
 582                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 583
 584         return err;
 585 }
 586
 587 static int write_one_config(const char *key, const char *value, void *data)
 588 {
 589         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 590 }
 591
 592 static void write_config(struct string_list *config)
 593 {
 594         int i;
 595
 596         for (i = 0; i < config->nr; i++) {
 597                 if (git_config_parse_parameter(config->items[i].string,
 598                                                write_one_config, NULL) < 0)
 599                         die("unable to write parameters to config file");
 600         }
 601 }
 602
 603 int cmd_clone(int argc, const char **argv, const char *prefix)
 604 {
 605         int is_bundle = 0, is_local;
 606         struct stat buf;
 607         const char *repo_name, *repo, *work_tree, *git_dir;
 608         char *path, *dir;
 609         int dest_exists;
 610         const struct ref *refs, *remote_head;
 611         const struct ref *remote_head_points_at;
 612         const struct ref *our_head_points_at;
 613         struct ref *mapped_refs;
 614         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 615         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 616         struct transport *transport = NULL;
 617         const char *src_ref_prefix = "refs/heads/";
 618         struct remote *remote;
 619         int err = 0;
 620
 621         struct refspec *refspec;
 622         const char *fetch_pattern;
 623
 624         junk_pid = getpid();
 625
 626         packet_trace_identity("clone");
 627         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 628                              builtin_clone_usage, 0);
 629
 630         if (argc > 2)
 631                 usage_msg_opt(_("Too many arguments."),
 632                         builtin_clone_usage, builtin_clone_options);
 633
 634         if (argc == 0)
 635                 usage_msg_opt(_("You must specify a repository to clone."),
 636                         builtin_clone_usage, builtin_clone_options);
 637
 638         if (option_single_branch == -1)
 639                 option_single_branch = option_depth ? 1 : 0;
 640
 641         if (option_mirror)
 642                 option_bare = 1;
 643
 644         if (option_bare) {
 645                 if (option_origin)
 646                         die(_("--bare and --origin %s options are incompatible."),
 647                             option_origin);
 648                 option_no_checkout = 1;
 649         }
 650
 651         if (!option_origin)
 652                 option_origin = "origin";
 653
 654         repo_name = argv[0];
 655
 656         path = get_repo_path(repo_name, &is_bundle);
 657         if (path)
 658                 repo = xstrdup(absolute_path(repo_name));
 659         else if (!strchr(repo_name, ':'))
 660                 die(_("repository '%s' does not exist"), repo_name);
 661         else
 662                 repo = repo_name;
 663         is_local = path && !is_bundle;
 664         if (is_local && option_depth)
 665                 warning(_("--depth is ignored in local clones; use file:// instead."));
 666
 667         if (argc == 2)
 668                 dir = xstrdup(argv[1]);
 669         else
 670                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 671         strip_trailing_slashes(dir);
 672
 673         dest_exists = !stat(dir, &buf);
 674         if (dest_exists && !is_empty_dir(dir))
 675                 die(_("destination path '%s' already exists and is not "
 676                         "an empty directory."), dir);
 677
 678         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 679
 680         if (option_bare)
 681                 work_tree = NULL;
 682         else {
 683                 work_tree = getenv("GIT_WORK_TREE");
 684                 if (work_tree && !stat(work_tree, &buf))
 685                         die(_("working tree '%s' already exists."), work_tree);
 686         }
 687
 688         if (option_bare || work_tree)
 689                 git_dir = xstrdup(dir);
 690         else {
 691                 work_tree = dir;
 692                 git_dir = xstrdup(mkpath("%s/.git", dir));
 693         }
 694
 695         if (!option_bare) {
 696                 junk_work_tree = work_tree;
 697                 if (safe_create_leading_directories_const(work_tree) < 0)
 698                         die_errno(_("could not create leading directories of '%s'"),
 699                                   work_tree);
 700                 if (!dest_exists && mkdir(work_tree, 0755))
 701                         die_errno(_("could not create work tree dir '%s'."),
 702                                   work_tree);
 703                 set_git_work_tree(work_tree);
 704         }
 705         junk_git_dir = git_dir;
 706         atexit(remove_junk);
 707         sigchain_push_common(remove_junk_on_signal);
 708
 709         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
 710
 711         if (safe_create_leading_directories_const(git_dir) < 0)
 712                 die(_("could not create leading directories of '%s'"), git_dir);
 713
 714         set_git_dir_init(git_dir, real_git_dir, 0);
 715         if (real_git_dir)
 716                 git_dir = real_git_dir;
 717
 718         if (0 <= option_verbosity) {
 719                 if (option_bare)
 720                         printf(_("Cloning into bare repository '%s'...\n"), dir);
 721                 else
 722                         printf(_("Cloning into '%s'...\n"), dir);
 723         }
 724         init_db(option_template, INIT_DB_QUIET);
 725         write_config(&option_config);
 726
 727         /*
 728          * At this point, the config exists, so we do not need the
 729          * environment variable.  We actually need to unset it, too, to
 730          * re-enable parsing of the global configs.
 731          */
 732         unsetenv(CONFIG_ENVIRONMENT);
 733
 734         git_config(git_default_config, NULL);
 735
 736         if (option_bare) {
 737                 if (option_mirror)
 738                         src_ref_prefix = "refs/";
 739                 strbuf_addstr(&branch_top, src_ref_prefix);
 740
 741                 git_config_set("core.bare", "true");
 742         } else {
 743                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 744         }
 745
 746         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 747
 748         if (option_mirror || !option_bare) {
 749                 /* Configure the remote */
 750                 strbuf_addf(&key, "remote.%s.fetch", option_origin);
 751                 git_config_set_multivar(key.buf, value.buf, "^$", 0);
 752                 strbuf_reset(&key);
 753
 754                 if (option_mirror) {
 755                         strbuf_addf(&key, "remote.%s.mirror", option_origin);
 756                         git_config_set(key.buf, "true");
 757                         strbuf_reset(&key);
 758                 }
 759         }
 760
 761         strbuf_addf(&key, "remote.%s.url", option_origin);
 762         git_config_set(key.buf, repo);
 763         strbuf_reset(&key);
 764
 765         if (option_reference.nr)
 766                 setup_reference();
 767
 768         fetch_pattern = value.buf;
 769         refspec = parse_fetch_refspec(1, &fetch_pattern);
 770
 771         strbuf_reset(&value);
 772
 773         remote = remote_get(option_origin);
 774         transport = transport_get(remote, remote->url[0]);
 775
 776         if (!is_local) {
 777                 if (!transport->get_refs_list || !transport->fetch)
 778                         die(_("Don't know how to clone %s"), transport->url);
 779
 780                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 781
 782                 if (option_depth)
 783                         transport_set_option(transport, TRANS_OPT_DEPTH,
 784                                              option_depth);
 785                 if (option_single_branch)
 786                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 787
 788                 transport_set_verbosity(transport, option_verbosity, option_progress);
 789
 790                 if (option_upload_pack)
 791                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 792                                              option_upload_pack);
 793         }
 794
 795         refs = transport_get_remote_refs(transport);
 796         mapped_refs = refs ? wanted_peer_refs(refs, refspec) : NULL;
 797
 798         /*
 799          * mapped_refs may be updated if transport-helper is used so
 800          * we need fetch it early because remote_head code below
 801          * relies on it.
 802          *
 803          * for normal clones, transport_get_remote_refs() should
 804          * return reliable ref set, we can delay cloning until after
 805          * remote HEAD check.
 806          */
 807         if (!is_local && remote->foreign_vcs && refs)
 808                 transport_fetch_refs(transport, mapped_refs);
 809
 810         if (refs) {
 811                 remote_head = find_ref_by_name(refs, "HEAD");
 812                 remote_head_points_at =
 813                         guess_remote_head(remote_head, mapped_refs, 0);
 814
 815                 if (option_branch) {
 816                         our_head_points_at =
 817                                 find_remote_branch(mapped_refs, option_branch);
 818
 819                         if (!our_head_points_at) {
 820                                 warning(_("Remote branch %s not found in "
 821                                         "upstream %s, using HEAD instead"),
 822                                         option_branch, option_origin);
 823                                 our_head_points_at = remote_head_points_at;
 824                         }
 825                 }
 826                 else
 827                         our_head_points_at = remote_head_points_at;
 828         }
 829         else {
 830                 warning(_("You appear to have cloned an empty repository."));
 831                 our_head_points_at = NULL;
 832                 remote_head_points_at = NULL;
 833                 remote_head = NULL;
 834                 option_no_checkout = 1;
 835                 if (!option_bare)
 836                         install_branch_config(0, "master", option_origin,
 837                                               "refs/heads/master");
 838         }
 839
 840         if (is_local)
 841                 clone_local(path, git_dir);
 842         else if (refs && !remote->foreign_vcs)
 843                 transport_fetch_refs(transport, mapped_refs);
 844
 845         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 846                            branch_top.buf, reflog_msg.buf);
 847
 848         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 849
 850         transport_unlock_pack(transport);
 851         transport_disconnect(transport);
 852
 853         err = checkout();
 854
 855         strbuf_release(&reflog_msg);
 856         strbuf_release(&branch_top);
 857         strbuf_release(&key);
 858         strbuf_release(&value);
 859         junk_pid = 0;
 860         return err;
 861 }