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
 424         if (ref)
 425                 return ref;
 426
 427         strbuf_addstr(&head, "refs/tags/");
 428         strbuf_addstr(&head, branch);
 429         ref = find_ref_by_name(refs, head.buf);
 430         strbuf_release(&head);
 431
 432         return ref;
 433 }
 434
 435 static struct ref *wanted_peer_refs(const struct ref *refs,
 436                 struct refspec *refspec)
 437 {
 438         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 439         struct ref *local_refs = head;
 440         struct ref **tail = head ? &head->next : &local_refs;
 441
 442         if (option_single_branch) {
 443                 struct ref *remote_head = NULL;
 444
 445                 if (!option_branch)
 446                         remote_head = guess_remote_head(head, refs, 0);
 447                 else
 448                         remote_head = find_remote_branch(refs, option_branch);
 449
 450                 if (!remote_head && option_branch)
 451                         warning(_("Could not find remote branch %s to clone."),
 452                                 option_branch);
 453                 else {
 454                         get_fetch_map(remote_head, refspec, &tail, 0);
 455
 456                         /* if --branch=tag, pull the requested tag explicitly */
 457                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 458                 }
 459         } else
 460                 get_fetch_map(refs, refspec, &tail, 0);
 461
 462         if (!option_mirror && !option_single_branch)
 463                 get_fetch_map(refs, tag_refspec, &tail, 0);
 464
 465         return local_refs;
 466 }
 467
 468 static void write_remote_refs(const struct ref *local_refs)
 469 {
 470         const struct ref *r;
 471
 472         for (r = local_refs; r; r = r->next) {
 473                 if (!r->peer_ref)
 474                         continue;
 475                 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
 476         }
 477
 478         pack_refs(PACK_REFS_ALL);
 479         clear_extra_refs();
 480 }
 481
 482 static void write_followtags(const struct ref *refs, const char *msg)
 483 {
 484         const struct ref *ref;
 485         for (ref = refs; ref; ref = ref->next) {
 486                 if (prefixcmp(ref->name, "refs/tags/"))
 487                         continue;
 488                 if (!suffixcmp(ref->name, "^{}"))
 489                         continue;
 490                 if (!has_sha1_file(ref->old_sha1))
 491                         continue;
 492                 update_ref(msg, ref->name, ref->old_sha1,
 493                            NULL, 0, DIE_ON_ERR);
 494         }
 495 }
 496
 497 static void update_remote_refs(const struct ref *refs,
 498                                const struct ref *mapped_refs,
 499                                const struct ref *remote_head_points_at,
 500                                const char *branch_top,
 501                                const char *msg)
 502 {
 503         if (refs) {
 504                 clear_extra_refs();
 505                 write_remote_refs(mapped_refs);
 506                 if (option_single_branch)
 507                         write_followtags(refs, msg);
 508         }
 509
 510         if (remote_head_points_at && !option_bare) {
 511                 struct strbuf head_ref = STRBUF_INIT;
 512                 strbuf_addstr(&head_ref, branch_top);
 513                 strbuf_addstr(&head_ref, "HEAD");
 514                 create_symref(head_ref.buf,
 515                               remote_head_points_at->peer_ref->name,
 516                               msg);
 517         }
 518 }
 519
 520 static void update_head(const struct ref *our, const struct ref *remote,
 521                         const char *msg)
 522 {
 523         if (our && !prefixcmp(our->name, "refs/heads/")) {
 524                 /* Local default branch link */
 525                 create_symref("HEAD", our->name, NULL);
 526                 if (!option_bare) {
 527                         const char *head = skip_prefix(our->name, "refs/heads/");
 528                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 529                         install_branch_config(0, head, option_origin, our->name);
 530                 }
 531         } else if (our) {
 532                 struct commit *c = lookup_commit_reference(our->old_sha1);
 533                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 534                 update_ref(msg, "HEAD", c->object.sha1,
 535                            NULL, REF_NODEREF, DIE_ON_ERR);
 536         } else if (remote) {
 537                 /*
 538                  * We know remote HEAD points to a non-branch, or
 539                  * HEAD points to a branch but we don't know which one.
 540                  * Detach HEAD in all these cases.
 541                  */
 542                 update_ref(msg, "HEAD", remote->old_sha1,
 543                            NULL, REF_NODEREF, DIE_ON_ERR);
 544         }
 545 }
 546
 547 static int checkout(void)
 548 {
 549         unsigned char sha1[20];
 550         char *head;
 551         struct lock_file *lock_file;
 552         struct unpack_trees_options opts;
 553         struct tree *tree;
 554         struct tree_desc t;
 555         int err = 0, fd;
 556
 557         if (option_no_checkout)
 558                 return 0;
 559
 560         head = resolve_refdup("HEAD", sha1, 1, NULL);
 561         if (!head) {
 562                 warning(_("remote HEAD refers to nonexistent ref, "
 563                           "unable to checkout.\n"));
 564                 return 0;
 565         }
 566         if (strcmp(head, "HEAD")) {
 567                 if (prefixcmp(head, "refs/heads/"))
 568                         die(_("HEAD not found below refs/heads!"));
 569         }
 570         free(head);
 571
 572         /* We need to be in the new work tree for the checkout */
 573         setup_work_tree();
 574
 575         lock_file = xcalloc(1, sizeof(struct lock_file));
 576         fd = hold_locked_index(lock_file, 1);
 577
 578         memset(&opts, 0, sizeof opts);
 579         opts.update = 1;
 580         opts.merge = 1;
 581         opts.fn = oneway_merge;
 582         opts.verbose_update = (option_verbosity > 0);
 583         opts.src_index = &the_index;
 584         opts.dst_index = &the_index;
 585
 586         tree = parse_tree_indirect(sha1);
 587         parse_tree(tree);
 588         init_tree_desc(&t, tree->buffer, tree->size);
 589         unpack_trees(1, &t, &opts);
 590
 591         if (write_cache(fd, active_cache, active_nr) ||
 592             commit_locked_index(lock_file))
 593                 die(_("unable to write new index file"));
 594
 595         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 596                         sha1_to_hex(sha1), "1", NULL);
 597
 598         if (!err && option_recursive)
 599                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 600
 601         return err;
 602 }
 603
 604 static int write_one_config(const char *key, const char *value, void *data)
 605 {
 606         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 607 }
 608
 609 static void write_config(struct string_list *config)
 610 {
 611         int i;
 612
 613         for (i = 0; i < config->nr; i++) {
 614                 if (git_config_parse_parameter(config->items[i].string,
 615                                                write_one_config, NULL) < 0)
 616                         die("unable to write parameters to config file");
 617         }
 618 }
 619
 620 int cmd_clone(int argc, const char **argv, const char *prefix)
 621 {
 622         int is_bundle = 0, is_local;
 623         struct stat buf;
 624         const char *repo_name, *repo, *work_tree, *git_dir;
 625         char *path, *dir;
 626         int dest_exists;
 627         const struct ref *refs, *remote_head;
 628         const struct ref *remote_head_points_at;
 629         const struct ref *our_head_points_at;
 630         struct ref *mapped_refs;
 631         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 632         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 633         struct transport *transport = NULL;
 634         const char *src_ref_prefix = "refs/heads/";
 635         struct remote *remote;
 636         int err = 0;
 637
 638         struct refspec *refspec;
 639         const char *fetch_pattern;
 640
 641         junk_pid = getpid();
 642
 643         packet_trace_identity("clone");
 644         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 645                              builtin_clone_usage, 0);
 646
 647         if (argc > 2)
 648                 usage_msg_opt(_("Too many arguments."),
 649                         builtin_clone_usage, builtin_clone_options);
 650
 651         if (argc == 0)
 652                 usage_msg_opt(_("You must specify a repository to clone."),
 653                         builtin_clone_usage, builtin_clone_options);
 654
 655         if (option_single_branch == -1)
 656                 option_single_branch = option_depth ? 1 : 0;
 657
 658         if (option_mirror)
 659                 option_bare = 1;
 660
 661         if (option_bare) {
 662                 if (option_origin)
 663                         die(_("--bare and --origin %s options are incompatible."),
 664                             option_origin);
 665                 option_no_checkout = 1;
 666         }
 667
 668         if (!option_origin)
 669                 option_origin = "origin";
 670
 671         repo_name = argv[0];
 672
 673         path = get_repo_path(repo_name, &is_bundle);
 674         if (path)
 675                 repo = xstrdup(absolute_path(repo_name));
 676         else if (!strchr(repo_name, ':'))
 677                 die(_("repository '%s' does not exist"), repo_name);
 678         else
 679                 repo = repo_name;
 680         is_local = path && !is_bundle;
 681         if (is_local && option_depth)
 682                 warning(_("--depth is ignored in local clones; use file:// instead."));
 683
 684         if (argc == 2)
 685                 dir = xstrdup(argv[1]);
 686         else
 687                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 688         strip_trailing_slashes(dir);
 689
 690         dest_exists = !stat(dir, &buf);
 691         if (dest_exists && !is_empty_dir(dir))
 692                 die(_("destination path '%s' already exists and is not "
 693                         "an empty directory."), dir);
 694
 695         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 696
 697         if (option_bare)
 698                 work_tree = NULL;
 699         else {
 700                 work_tree = getenv("GIT_WORK_TREE");
 701                 if (work_tree && !stat(work_tree, &buf))
 702                         die(_("working tree '%s' already exists."), work_tree);
 703         }
 704
 705         if (option_bare || work_tree)
 706                 git_dir = xstrdup(dir);
 707         else {
 708                 work_tree = dir;
 709                 git_dir = xstrdup(mkpath("%s/.git", dir));
 710         }
 711
 712         if (!option_bare) {
 713                 junk_work_tree = work_tree;
 714                 if (safe_create_leading_directories_const(work_tree) < 0)
 715                         die_errno(_("could not create leading directories of '%s'"),
 716                                   work_tree);
 717                 if (!dest_exists && mkdir(work_tree, 0755))
 718                         die_errno(_("could not create work tree dir '%s'."),
 719                                   work_tree);
 720                 set_git_work_tree(work_tree);
 721         }
 722         junk_git_dir = git_dir;
 723         atexit(remove_junk);
 724         sigchain_push_common(remove_junk_on_signal);
 725
 726         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
 727
 728         if (safe_create_leading_directories_const(git_dir) < 0)
 729                 die(_("could not create leading directories of '%s'"), git_dir);
 730
 731         set_git_dir_init(git_dir, real_git_dir, 0);
 732         if (real_git_dir)
 733                 git_dir = real_git_dir;
 734
 735         if (0 <= option_verbosity) {
 736                 if (option_bare)
 737                         printf(_("Cloning into bare repository '%s'...\n"), dir);
 738                 else
 739                         printf(_("Cloning into '%s'...\n"), dir);
 740         }
 741         init_db(option_template, INIT_DB_QUIET);
 742         write_config(&option_config);
 743
 744         /*
 745          * At this point, the config exists, so we do not need the
 746          * environment variable.  We actually need to unset it, too, to
 747          * re-enable parsing of the global configs.
 748          */
 749         unsetenv(CONFIG_ENVIRONMENT);
 750
 751         git_config(git_default_config, NULL);
 752
 753         if (option_bare) {
 754                 if (option_mirror)
 755                         src_ref_prefix = "refs/";
 756                 strbuf_addstr(&branch_top, src_ref_prefix);
 757
 758                 git_config_set("core.bare", "true");
 759         } else {
 760                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 761         }
 762
 763         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 764
 765         if (option_mirror || !option_bare) {
 766                 /* Configure the remote */
 767                 strbuf_addf(&key, "remote.%s.fetch", option_origin);
 768                 git_config_set_multivar(key.buf, value.buf, "^$", 0);
 769                 strbuf_reset(&key);
 770
 771                 if (option_mirror) {
 772                         strbuf_addf(&key, "remote.%s.mirror", option_origin);
 773                         git_config_set(key.buf, "true");
 774                         strbuf_reset(&key);
 775                 }
 776         }
 777
 778         strbuf_addf(&key, "remote.%s.url", option_origin);
 779         git_config_set(key.buf, repo);
 780         strbuf_reset(&key);
 781
 782         if (option_reference.nr)
 783                 setup_reference();
 784
 785         fetch_pattern = value.buf;
 786         refspec = parse_fetch_refspec(1, &fetch_pattern);
 787
 788         strbuf_reset(&value);
 789
 790         remote = remote_get(option_origin);
 791         transport = transport_get(remote, remote->url[0]);
 792
 793         if (!is_local) {
 794                 if (!transport->get_refs_list || !transport->fetch)
 795                         die(_("Don't know how to clone %s"), transport->url);
 796
 797                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 798
 799                 if (option_depth)
 800                         transport_set_option(transport, TRANS_OPT_DEPTH,
 801                                              option_depth);
 802                 if (option_single_branch)
 803                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 804
 805                 transport_set_verbosity(transport, option_verbosity, option_progress);
 806
 807                 if (option_upload_pack)
 808                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 809                                              option_upload_pack);
 810         }
 811
 812         refs = transport_get_remote_refs(transport);
 813         mapped_refs = refs ? wanted_peer_refs(refs, refspec) : NULL;
 814
 815         /*
 816          * mapped_refs may be updated if transport-helper is used so
 817          * we need fetch it early because remote_head code below
 818          * relies on it.
 819          *
 820          * for normal clones, transport_get_remote_refs() should
 821          * return reliable ref set, we can delay cloning until after
 822          * remote HEAD check.
 823          */
 824         if (!is_local && remote->foreign_vcs && refs)
 825                 transport_fetch_refs(transport, mapped_refs);
 826
 827         if (refs) {
 828                 remote_head = find_ref_by_name(refs, "HEAD");
 829                 remote_head_points_at =
 830                         guess_remote_head(remote_head, mapped_refs, 0);
 831
 832                 if (option_branch) {
 833                         our_head_points_at =
 834                                 find_remote_branch(mapped_refs, option_branch);
 835
 836                         if (!our_head_points_at)
 837                                 die(_("Remote branch %s not found in upstream %s"),
 838                                     option_branch, option_origin);
 839                 }
 840                 else
 841                         our_head_points_at = remote_head_points_at;
 842         }
 843         else {
 844                 warning(_("You appear to have cloned an empty repository."));
 845                 our_head_points_at = NULL;
 846                 remote_head_points_at = NULL;
 847                 remote_head = NULL;
 848                 option_no_checkout = 1;
 849                 if (!option_bare)
 850                         install_branch_config(0, "master", option_origin,
 851                                               "refs/heads/master");
 852         }
 853
 854         if (is_local)
 855                 clone_local(path, git_dir);
 856         else if (refs && !remote->foreign_vcs)
 857                 transport_fetch_refs(transport, mapped_refs);
 858
 859         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 860                            branch_top.buf, reflog_msg.buf);
 861
 862         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 863
 864         transport_unlock_pack(transport);
 865         transport_disconnect(transport);
 866
 867         err = checkout();
 868
 869         strbuf_release(&reflog_msg);
 870         strbuf_release(&branch_top);
 871         strbuf_release(&key);
 872         strbuf_release(&value);
 873         junk_pid = 0;
 874         return err;
 875 }