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_packed_ref(r->peer_ref->name, r->old_sha1);
 476         }
 477
 478         pack_refs(PACK_REFS_ALL);
 479 }
 480
 481 static void write_followtags(const struct ref *refs, const char *msg)
 482 {
 483         const struct ref *ref;
 484         for (ref = refs; ref; ref = ref->next) {
 485                 if (prefixcmp(ref->name, "refs/tags/"))
 486                         continue;
 487                 if (!suffixcmp(ref->name, "^{}"))
 488                         continue;
 489                 if (!has_sha1_file(ref->old_sha1))
 490                         continue;
 491                 update_ref(msg, ref->name, ref->old_sha1,
 492                            NULL, 0, DIE_ON_ERR);
 493         }
 494 }
 495
 496 static void update_remote_refs(const struct ref *refs,
 497                                const struct ref *mapped_refs,
 498                                const struct ref *remote_head_points_at,
 499                                const char *branch_top,
 500                                const char *msg)
 501 {
 502         if (refs) {
 503                 clear_extra_refs();
 504                 write_remote_refs(mapped_refs);
 505                 if (option_single_branch)
 506                         write_followtags(refs, msg);
 507         }
 508
 509         if (remote_head_points_at && !option_bare) {
 510                 struct strbuf head_ref = STRBUF_INIT;
 511                 strbuf_addstr(&head_ref, branch_top);
 512                 strbuf_addstr(&head_ref, "HEAD");
 513                 create_symref(head_ref.buf,
 514                               remote_head_points_at->peer_ref->name,
 515                               msg);
 516         }
 517 }
 518
 519 static void update_head(const struct ref *our, const struct ref *remote,
 520                         const char *msg)
 521 {
 522         if (our && !prefixcmp(our->name, "refs/heads/")) {
 523                 /* Local default branch link */
 524                 create_symref("HEAD", our->name, NULL);
 525                 if (!option_bare) {
 526                         const char *head = skip_prefix(our->name, "refs/heads/");
 527                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 528                         install_branch_config(0, head, option_origin, our->name);
 529                 }
 530         } else if (our) {
 531                 struct commit *c = lookup_commit_reference(our->old_sha1);
 532                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 533                 update_ref(msg, "HEAD", c->object.sha1,
 534                            NULL, REF_NODEREF, DIE_ON_ERR);
 535         } else if (remote) {
 536                 /*
 537                  * We know remote HEAD points to a non-branch, or
 538                  * HEAD points to a branch but we don't know which one.
 539                  * Detach HEAD in all these cases.
 540                  */
 541                 update_ref(msg, "HEAD", remote->old_sha1,
 542                            NULL, REF_NODEREF, DIE_ON_ERR);
 543         }
 544 }
 545
 546 static int checkout(void)
 547 {
 548         unsigned char sha1[20];
 549         char *head;
 550         struct lock_file *lock_file;
 551         struct unpack_trees_options opts;
 552         struct tree *tree;
 553         struct tree_desc t;
 554         int err = 0, fd;
 555
 556         if (option_no_checkout)
 557                 return 0;
 558
 559         head = resolve_refdup("HEAD", sha1, 1, NULL);
 560         if (!head) {
 561                 warning(_("remote HEAD refers to nonexistent ref, "
 562                           "unable to checkout.\n"));
 563                 return 0;
 564         }
 565         if (!strcmp(head, "HEAD")) {
 566                 if (advice_detached_head)
 567                         detach_advice(sha1_to_hex(sha1));
 568         } else {
 569                 if (prefixcmp(head, "refs/heads/"))
 570                         die(_("HEAD not found below refs/heads!"));
 571         }
 572         free(head);
 573
 574         /* We need to be in the new work tree for the checkout */
 575         setup_work_tree();
 576
 577         lock_file = xcalloc(1, sizeof(struct lock_file));
 578         fd = hold_locked_index(lock_file, 1);
 579
 580         memset(&opts, 0, sizeof opts);
 581         opts.update = 1;
 582         opts.merge = 1;
 583         opts.fn = oneway_merge;
 584         opts.verbose_update = (option_verbosity > 0);
 585         opts.src_index = &the_index;
 586         opts.dst_index = &the_index;
 587
 588         tree = parse_tree_indirect(sha1);
 589         parse_tree(tree);
 590         init_tree_desc(&t, tree->buffer, tree->size);
 591         unpack_trees(1, &t, &opts);
 592
 593         if (write_cache(fd, active_cache, active_nr) ||
 594             commit_locked_index(lock_file))
 595                 die(_("unable to write new index file"));
 596
 597         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 598                         sha1_to_hex(sha1), "1", NULL);
 599
 600         if (!err && option_recursive)
 601                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 602
 603         return err;
 604 }
 605
 606 static int write_one_config(const char *key, const char *value, void *data)
 607 {
 608         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 609 }
 610
 611 static void write_config(struct string_list *config)
 612 {
 613         int i;
 614
 615         for (i = 0; i < config->nr; i++) {
 616                 if (git_config_parse_parameter(config->items[i].string,
 617                                                write_one_config, NULL) < 0)
 618                         die("unable to write parameters to config file");
 619         }
 620 }
 621
 622 int cmd_clone(int argc, const char **argv, const char *prefix)
 623 {
 624         int is_bundle = 0, is_local;
 625         struct stat buf;
 626         const char *repo_name, *repo, *work_tree, *git_dir;
 627         char *path, *dir;
 628         int dest_exists;
 629         const struct ref *refs, *remote_head;
 630         const struct ref *remote_head_points_at;
 631         const struct ref *our_head_points_at;
 632         struct ref *mapped_refs;
 633         const struct ref *ref;
 634         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 635         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 636         struct transport *transport = NULL;
 637         const char *src_ref_prefix = "refs/heads/";
 638         struct remote *remote;
 639         int err = 0, complete_refs_before_fetch = 1;
 640
 641         struct refspec *refspec;
 642         const char *fetch_pattern;
 643
 644         junk_pid = getpid();
 645
 646         packet_trace_identity("clone");
 647         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 648                              builtin_clone_usage, 0);
 649
 650         if (argc > 2)
 651                 usage_msg_opt(_("Too many arguments."),
 652                         builtin_clone_usage, builtin_clone_options);
 653
 654         if (argc == 0)
 655                 usage_msg_opt(_("You must specify a repository to clone."),
 656                         builtin_clone_usage, builtin_clone_options);
 657
 658         if (option_single_branch == -1)
 659                 option_single_branch = option_depth ? 1 : 0;
 660
 661         if (option_mirror)
 662                 option_bare = 1;
 663
 664         if (option_bare) {
 665                 if (option_origin)
 666                         die(_("--bare and --origin %s options are incompatible."),
 667                             option_origin);
 668                 option_no_checkout = 1;
 669         }
 670
 671         if (!option_origin)
 672                 option_origin = "origin";
 673
 674         repo_name = argv[0];
 675
 676         path = get_repo_path(repo_name, &is_bundle);
 677         if (path)
 678                 repo = xstrdup(absolute_path(repo_name));
 679         else if (!strchr(repo_name, ':'))
 680                 die(_("repository '%s' does not exist"), repo_name);
 681         else
 682                 repo = repo_name;
 683         is_local = path && !is_bundle;
 684         if (is_local && option_depth)
 685                 warning(_("--depth is ignored in local clones; use file:// instead."));
 686
 687         if (argc == 2)
 688                 dir = xstrdup(argv[1]);
 689         else
 690                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 691         strip_trailing_slashes(dir);
 692
 693         dest_exists = !stat(dir, &buf);
 694         if (dest_exists && !is_empty_dir(dir))
 695                 die(_("destination path '%s' already exists and is not "
 696                         "an empty directory."), dir);
 697
 698         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 699
 700         if (option_bare)
 701                 work_tree = NULL;
 702         else {
 703                 work_tree = getenv("GIT_WORK_TREE");
 704                 if (work_tree && !stat(work_tree, &buf))
 705                         die(_("working tree '%s' already exists."), work_tree);
 706         }
 707
 708         if (option_bare || work_tree)
 709                 git_dir = xstrdup(dir);
 710         else {
 711                 work_tree = dir;
 712                 git_dir = xstrdup(mkpath("%s/.git", dir));
 713         }
 714
 715         if (!option_bare) {
 716                 junk_work_tree = work_tree;
 717                 if (safe_create_leading_directories_const(work_tree) < 0)
 718                         die_errno(_("could not create leading directories of '%s'"),
 719                                   work_tree);
 720                 if (!dest_exists && mkdir(work_tree, 0755))
 721                         die_errno(_("could not create work tree dir '%s'."),
 722                                   work_tree);
 723                 set_git_work_tree(work_tree);
 724         }
 725         junk_git_dir = git_dir;
 726         atexit(remove_junk);
 727         sigchain_push_common(remove_junk_on_signal);
 728
 729         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
 730
 731         if (safe_create_leading_directories_const(git_dir) < 0)
 732                 die(_("could not create leading directories of '%s'"), git_dir);
 733
 734         set_git_dir_init(git_dir, real_git_dir, 0);
 735         if (real_git_dir)
 736                 git_dir = real_git_dir;
 737
 738         if (0 <= option_verbosity) {
 739                 if (option_bare)
 740                         printf(_("Cloning into bare repository '%s'...\n"), dir);
 741                 else
 742                         printf(_("Cloning into '%s'...\n"), dir);
 743         }
 744         init_db(option_template, INIT_DB_QUIET);
 745         write_config(&option_config);
 746
 747         /*
 748          * At this point, the config exists, so we do not need the
 749          * environment variable.  We actually need to unset it, too, to
 750          * re-enable parsing of the global configs.
 751          */
 752         unsetenv(CONFIG_ENVIRONMENT);
 753
 754         git_config(git_default_config, NULL);
 755
 756         if (option_bare) {
 757                 if (option_mirror)
 758                         src_ref_prefix = "refs/";
 759                 strbuf_addstr(&branch_top, src_ref_prefix);
 760
 761                 git_config_set("core.bare", "true");
 762         } else {
 763                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 764         }
 765
 766         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 767
 768         if (option_mirror || !option_bare) {
 769                 /* Configure the remote */
 770                 strbuf_addf(&key, "remote.%s.fetch", option_origin);
 771                 git_config_set_multivar(key.buf, value.buf, "^$", 0);
 772                 strbuf_reset(&key);
 773
 774                 if (option_mirror) {
 775                         strbuf_addf(&key, "remote.%s.mirror", option_origin);
 776                         git_config_set(key.buf, "true");
 777                         strbuf_reset(&key);
 778                 }
 779         }
 780
 781         strbuf_addf(&key, "remote.%s.url", option_origin);
 782         git_config_set(key.buf, repo);
 783         strbuf_reset(&key);
 784
 785         if (option_reference.nr)
 786                 setup_reference();
 787
 788         fetch_pattern = value.buf;
 789         refspec = parse_fetch_refspec(1, &fetch_pattern);
 790
 791         strbuf_reset(&value);
 792
 793         remote = remote_get(option_origin);
 794         transport = transport_get(remote, remote->url[0]);
 795
 796         if (!is_local) {
 797                 if (!transport->get_refs_list || !transport->fetch)
 798                         die(_("Don't know how to clone %s"), transport->url);
 799
 800                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 801
 802                 if (option_depth)
 803                         transport_set_option(transport, TRANS_OPT_DEPTH,
 804                                              option_depth);
 805                 if (option_single_branch)
 806                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 807
 808                 transport_set_verbosity(transport, option_verbosity, option_progress);
 809
 810                 if (option_upload_pack)
 811                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 812                                              option_upload_pack);
 813         }
 814
 815         refs = transport_get_remote_refs(transport);
 816         mapped_refs = refs ? wanted_peer_refs(refs, refspec) : NULL;
 817
 818         /*
 819          * transport_get_remote_refs() may return refs with null sha-1
 820          * in mapped_refs (see struct transport->get_refs_list
 821          * comment). In that case we need fetch it early because
 822          * remote_head code below relies on it.
 823          *
 824          * for normal clones, transport_get_remote_refs() should
 825          * return reliable ref set, we can delay cloning until after
 826          * remote HEAD check.
 827          */
 828         for (ref = refs; ref; ref = ref->next)
 829                 if (is_null_sha1(ref->old_sha1)) {
 830                         complete_refs_before_fetch = 0;
 831                         break;
 832                 }
 833
 834         if (!is_local && !complete_refs_before_fetch && refs)
 835                 transport_fetch_refs(transport, mapped_refs);
 836
 837         if (refs) {
 838                 remote_head = find_ref_by_name(refs, "HEAD");
 839                 remote_head_points_at =
 840                         guess_remote_head(remote_head, mapped_refs, 0);
 841
 842                 if (option_branch) {
 843                         our_head_points_at =
 844                                 find_remote_branch(mapped_refs, option_branch);
 845
 846                         if (!our_head_points_at)
 847                                 die(_("Remote branch %s not found in upstream %s"),
 848                                     option_branch, option_origin);
 849                 }
 850                 else
 851                         our_head_points_at = remote_head_points_at;
 852         }
 853         else {
 854                 warning(_("You appear to have cloned an empty repository."));
 855                 our_head_points_at = NULL;
 856                 remote_head_points_at = NULL;
 857                 remote_head = NULL;
 858                 option_no_checkout = 1;
 859                 if (!option_bare)
 860                         install_branch_config(0, "master", option_origin,
 861                                               "refs/heads/master");
 862         }
 863
 864         if (is_local)
 865                 clone_local(path, git_dir);
 866         else if (refs && complete_refs_before_fetch)
 867                 transport_fetch_refs(transport, mapped_refs);
 868
 869         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 870                            branch_top.buf, reflog_msg.buf);
 871
 872         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 873
 874         transport_unlock_pack(transport);
 875         transport_disconnect(transport);
 876
 877         err = checkout();
 878
 879         strbuf_release(&reflog_msg);
 880         strbuf_release(&branch_top);
 881         strbuf_release(&key);
 882         strbuf_release(&value);
 883         junk_pid = 0;
 884         return err;
 885 }