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 "sigchain.h"
  22 #include "branch.h"
  23 #include "remote.h"
  24 #include "run-command.h"
  25
  26 /*
  27  * Overall FIXMEs:
  28  *  - respect DB_ENVIRONMENT for .git/objects.
  29  *
  30  * Implementation notes:
  31  *  - dropping use-separate-remote and no-separate-remote compatibility
  32  *
  33  */
  34 static const char * const builtin_clone_usage[] = {
  35         N_("git clone [options] [--] <repo> [<dir>]"),
  36         NULL
  37 };
  38
  39 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  40 static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
  41 static char *option_template, *option_depth;
  42 static char *option_origin = NULL;
  43 static char *option_branch = NULL;
  44 static const char *real_git_dir;
  45 static char *option_upload_pack = "git-upload-pack";
  46 static int option_verbosity;
  47 static int option_progress = -1;
  48 static struct string_list option_config;
  49 static struct string_list option_reference;
  50
  51 static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
  52 {
  53         struct string_list *option_reference = opt->value;
  54         if (!arg)
  55                 return -1;
  56         string_list_append(option_reference, arg);
  57         return 0;
  58 }
  59
  60 static struct option builtin_clone_options[] = {
  61         OPT__VERBOSITY(&option_verbosity),
  62         OPT_BOOL(0, "progress", &option_progress,
  63                  N_("force progress reporting")),
  64         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  65                     N_("don't create a checkout")),
  66         OPT_BOOLEAN(0, "bare", &option_bare, N_("create a bare repository")),
  67         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
  68                 N_("create a bare repository"),
  69                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
  70         OPT_BOOLEAN(0, "mirror", &option_mirror,
  71                     N_("create a mirror repository (implies bare)")),
  72         OPT_BOOL('l', "local", &option_local,
  73                 N_("to clone from a local repository")),
  74         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  75                     N_("don't use local hardlinks, always copy")),
  76         OPT_BOOLEAN('s', "shared", &option_shared,
  77                     N_("setup as shared repository")),
  78         OPT_BOOLEAN(0, "recursive", &option_recursive,
  79                     N_("initialize submodules in the clone")),
  80         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
  81                     N_("initialize submodules in the clone")),
  82         OPT_STRING(0, "template", &option_template, N_("template-directory"),
  83                    N_("directory from which templates will be used")),
  84         OPT_CALLBACK(0 , "reference", &option_reference, N_("repo"),
  85                      N_("reference repository"), &opt_parse_reference),
  86         OPT_STRING('o', "origin", &option_origin, N_("name"),
  87                    N_("use <name> instead of 'origin' to track upstream")),
  88         OPT_STRING('b', "branch", &option_branch, N_("branch"),
  89                    N_("checkout <branch> instead of the remote's HEAD")),
  90         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  91                    N_("path to git-upload-pack on the remote")),
  92         OPT_STRING(0, "depth", &option_depth, N_("depth"),
  93                     N_("create a shallow clone of that depth")),
  94         OPT_BOOL(0, "single-branch", &option_single_branch,
  95                     N_("clone only one branch, HEAD or --branch")),
  96         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  97                    N_("separate git dir from working tree")),
  98         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
  99                         N_("set config inside the new repository")),
 100         OPT_END()
 101 };
 102
 103 static const char *argv_submodule[] = {
 104         "submodule", "update", "--init", "--recursive", NULL
 105 };
 106
 107 static char *get_repo_path(const char *repo, int *is_bundle)
 108 {
 109         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 110         static char *bundle_suffix[] = { ".bundle", "" };
 111         struct stat st;
 112         int i;
 113
 114         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 115                 const char *path;
 116                 path = mkpath("%s%s", repo, suffix[i]);
 117                 if (stat(path, &st))
 118                         continue;
 119                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
 120                         *is_bundle = 0;
 121                         return xstrdup(absolute_path(path));
 122                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 123                         /* Is it a "gitfile"? */
 124                         char signature[8];
 125                         int len, fd = open(path, O_RDONLY);
 126                         if (fd < 0)
 127                                 continue;
 128                         len = read_in_full(fd, signature, 8);
 129                         close(fd);
 130                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 131                                 continue;
 132                         path = read_gitfile(path);
 133                         if (path) {
 134                                 *is_bundle = 0;
 135                                 return xstrdup(absolute_path(path));
 136                         }
 137                 }
 138         }
 139
 140         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 141                 const char *path;
 142                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 143                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 144                         *is_bundle = 1;
 145                         return xstrdup(absolute_path(path));
 146                 }
 147         }
 148
 149         return NULL;
 150 }
 151
 152 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 153 {
 154         const char *end = repo + strlen(repo), *start;
 155         char *dir;
 156
 157         /*
 158          * Strip trailing spaces, slashes and /.git
 159          */
 160         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 161                 end--;
 162         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 163             !strncmp(end - 4, ".git", 4)) {
 164                 end -= 5;
 165                 while (repo < end && is_dir_sep(end[-1]))
 166                         end--;
 167         }
 168
 169         /*
 170          * Find last component, but be prepared that repo could have
 171          * the form  "remote.example.com:foo.git", i.e. no slash
 172          * in the directory part.
 173          */
 174         start = end;
 175         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 176                 start--;
 177
 178         /*
 179          * Strip .{bundle,git}.
 180          */
 181         if (is_bundle) {
 182                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 183                         end -= 7;
 184         } else {
 185                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 186                         end -= 4;
 187         }
 188
 189         if (is_bare) {
 190                 struct strbuf result = STRBUF_INIT;
 191                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 192                 dir = strbuf_detach(&result, NULL);
 193         } else
 194                 dir = xstrndup(start, end - start);
 195         /*
 196          * Replace sequences of 'control' characters and whitespace
 197          * with one ascii space, remove leading and trailing spaces.
 198          */
 199         if (*dir) {
 200                 char *out = dir;
 201                 int prev_space = 1 /* strip leading whitespace */;
 202                 for (end = dir; *end; ++end) {
 203                         char ch = *end;
 204                         if ((unsigned char)ch < '\x20')
 205                                 ch = '\x20';
 206                         if (isspace(ch)) {
 207                                 if (prev_space)
 208                                         continue;
 209                                 prev_space = 1;
 210                         } else
 211                                 prev_space = 0;
 212                         *out++ = ch;
 213                 }
 214                 *out = '\0';
 215                 if (out > dir && prev_space)
 216                         out[-1] = '\0';
 217         }
 218         return dir;
 219 }
 220
 221 static void strip_trailing_slashes(char *dir)
 222 {
 223         char *end = dir + strlen(dir);
 224
 225         while (dir < end - 1 && is_dir_sep(end[-1]))
 226                 end--;
 227         *end = '\0';
 228 }
 229
 230 static int add_one_reference(struct string_list_item *item, void *cb_data)
 231 {
 232         char *ref_git;
 233         struct strbuf alternate = STRBUF_INIT;
 234
 235         /* Beware: real_path() and mkpath() return static buffer */
 236         ref_git = xstrdup(real_path(item->string));
 237         if (is_directory(mkpath("%s/.git/objects", ref_git))) {
 238                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 239                 free(ref_git);
 240                 ref_git = ref_git_git;
 241         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 242                 die(_("reference repository '%s' is not a local directory."),
 243                     item->string);
 244
 245         strbuf_addf(&alternate, "%s/objects", ref_git);
 246         add_to_alternates_file(alternate.buf);
 247         strbuf_release(&alternate);
 248         free(ref_git);
 249         return 0;
 250 }
 251
 252 static void setup_reference(void)
 253 {
 254         for_each_string_list(&option_reference, add_one_reference, NULL);
 255 }
 256
 257 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 258                             const char *src_repo)
 259 {
 260         /*
 261          * Read from the source objects/info/alternates file
 262          * and copy the entries to corresponding file in the
 263          * destination repository with add_to_alternates_file().
 264          * Both src and dst have "$path/objects/info/alternates".
 265          *
 266          * Instead of copying bit-for-bit from the original,
 267          * we need to append to existing one so that the already
 268          * created entry via "clone -s" is not lost, and also
 269          * to turn entries with paths relative to the original
 270          * absolute, so that they can be used in the new repository.
 271          */
 272         FILE *in = fopen(src->buf, "r");
 273         struct strbuf line = STRBUF_INIT;
 274
 275         while (strbuf_getline(&line, in, '\n') != EOF) {
 276                 char *abs_path, abs_buf[PATH_MAX];
 277                 if (!line.len || line.buf[0] == '#')
 278                         continue;
 279                 if (is_absolute_path(line.buf)) {
 280                         add_to_alternates_file(line.buf);
 281                         continue;
 282                 }
 283                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
 284                 normalize_path_copy(abs_buf, abs_path);
 285                 add_to_alternates_file(abs_buf);
 286         }
 287         strbuf_release(&line);
 288         fclose(in);
 289 }
 290
 291 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 292                                    const char *src_repo, int src_baselen)
 293 {
 294         struct dirent *de;
 295         struct stat buf;
 296         int src_len, dest_len;
 297         DIR *dir;
 298
 299         dir = opendir(src->buf);
 300         if (!dir)
 301                 die_errno(_("failed to open '%s'"), src->buf);
 302
 303         if (mkdir(dest->buf, 0777)) {
 304                 if (errno != EEXIST)
 305                         die_errno(_("failed to create directory '%s'"), dest->buf);
 306                 else if (stat(dest->buf, &buf))
 307                         die_errno(_("failed to stat '%s'"), dest->buf);
 308                 else if (!S_ISDIR(buf.st_mode))
 309                         die(_("%s exists and is not a directory"), dest->buf);
 310         }
 311
 312         strbuf_addch(src, '/');
 313         src_len = src->len;
 314         strbuf_addch(dest, '/');
 315         dest_len = dest->len;
 316
 317         while ((de = readdir(dir)) != NULL) {
 318                 strbuf_setlen(src, src_len);
 319                 strbuf_addstr(src, de->d_name);
 320                 strbuf_setlen(dest, dest_len);
 321                 strbuf_addstr(dest, de->d_name);
 322                 if (stat(src->buf, &buf)) {
 323                         warning (_("failed to stat %s\n"), src->buf);
 324                         continue;
 325                 }
 326                 if (S_ISDIR(buf.st_mode)) {
 327                         if (de->d_name[0] != '.')
 328                                 copy_or_link_directory(src, dest,
 329                                                        src_repo, src_baselen);
 330                         continue;
 331                 }
 332
 333                 /* Files that cannot be copied bit-for-bit... */
 334                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 335                         copy_alternates(src, dest, src_repo);
 336                         continue;
 337                 }
 338
 339                 if (unlink(dest->buf) && errno != ENOENT)
 340                         die_errno(_("failed to unlink '%s'"), dest->buf);
 341                 if (!option_no_hardlinks) {
 342                         if (!link(src->buf, dest->buf))
 343                                 continue;
 344                         if (option_local > 0)
 345                                 die_errno(_("failed to create link '%s'"), dest->buf);
 346                         option_no_hardlinks = 1;
 347                 }
 348                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 349                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 350         }
 351         closedir(dir);
 352 }
 353
 354 static void clone_local(const char *src_repo, const char *dest_repo)
 355 {
 356         if (option_shared) {
 357                 struct strbuf alt = STRBUF_INIT;
 358                 strbuf_addf(&alt, "%s/objects", src_repo);
 359                 add_to_alternates_file(alt.buf);
 360                 strbuf_release(&alt);
 361         } else {
 362                 struct strbuf src = STRBUF_INIT;
 363                 struct strbuf dest = STRBUF_INIT;
 364                 strbuf_addf(&src, "%s/objects", src_repo);
 365                 strbuf_addf(&dest, "%s/objects", dest_repo);
 366                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 367                 strbuf_release(&src);
 368                 strbuf_release(&dest);
 369         }
 370
 371         if (0 <= option_verbosity)
 372                 printf(_("done.\n"));
 373 }
 374
 375 static const char *junk_work_tree;
 376 static const char *junk_git_dir;
 377 static pid_t junk_pid;
 378
 379 static void remove_junk(void)
 380 {
 381         struct strbuf sb = STRBUF_INIT;
 382         if (getpid() != junk_pid)
 383                 return;
 384         if (junk_git_dir) {
 385                 strbuf_addstr(&sb, junk_git_dir);
 386                 remove_dir_recursively(&sb, 0);
 387                 strbuf_reset(&sb);
 388         }
 389         if (junk_work_tree) {
 390                 strbuf_addstr(&sb, junk_work_tree);
 391                 remove_dir_recursively(&sb, 0);
 392                 strbuf_reset(&sb);
 393         }
 394 }
 395
 396 static void remove_junk_on_signal(int signo)
 397 {
 398         remove_junk();
 399         sigchain_pop(signo);
 400         raise(signo);
 401 }
 402
 403 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 404 {
 405         struct ref *ref;
 406         struct strbuf head = STRBUF_INIT;
 407         strbuf_addstr(&head, "refs/heads/");
 408         strbuf_addstr(&head, branch);
 409         ref = find_ref_by_name(refs, head.buf);
 410         strbuf_release(&head);
 411
 412         if (ref)
 413                 return ref;
 414
 415         strbuf_addstr(&head, "refs/tags/");
 416         strbuf_addstr(&head, branch);
 417         ref = find_ref_by_name(refs, head.buf);
 418         strbuf_release(&head);
 419
 420         return ref;
 421 }
 422
 423 static struct ref *wanted_peer_refs(const struct ref *refs,
 424                 struct refspec *refspec)
 425 {
 426         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 427         struct ref *local_refs = head;
 428         struct ref **tail = head ? &head->next : &local_refs;
 429
 430         if (option_single_branch) {
 431                 struct ref *remote_head = NULL;
 432
 433                 if (!option_branch)
 434                         remote_head = guess_remote_head(head, refs, 0);
 435                 else {
 436                         local_refs = NULL;
 437                         tail = &local_refs;
 438                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 439                 }
 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
 447                         /* if --branch=tag, pull the requested tag explicitly */
 448                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 449                 }
 450         } else
 451                 get_fetch_map(refs, refspec, &tail, 0);
 452
 453         if (!option_mirror && !option_single_branch)
 454                 get_fetch_map(refs, tag_refspec, &tail, 0);
 455
 456         return local_refs;
 457 }
 458
 459 static void write_remote_refs(const struct ref *local_refs)
 460 {
 461         const struct ref *r;
 462
 463         for (r = local_refs; r; r = r->next) {
 464                 if (!r->peer_ref)
 465                         continue;
 466                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 467         }
 468
 469         pack_refs(PACK_REFS_ALL);
 470 }
 471
 472 static void write_followtags(const struct ref *refs, const char *msg)
 473 {
 474         const struct ref *ref;
 475         for (ref = refs; ref; ref = ref->next) {
 476                 if (prefixcmp(ref->name, "refs/tags/"))
 477                         continue;
 478                 if (!suffixcmp(ref->name, "^{}"))
 479                         continue;
 480                 if (!has_sha1_file(ref->old_sha1))
 481                         continue;
 482                 update_ref(msg, ref->name, ref->old_sha1,
 483                            NULL, 0, DIE_ON_ERR);
 484         }
 485 }
 486
 487 static void update_remote_refs(const struct ref *refs,
 488                                const struct ref *mapped_refs,
 489                                const struct ref *remote_head_points_at,
 490                                const char *branch_top,
 491                                const char *msg)
 492 {
 493         if (refs) {
 494                 write_remote_refs(mapped_refs);
 495                 if (option_single_branch)
 496                         write_followtags(refs, msg);
 497         }
 498
 499         if (remote_head_points_at && !option_bare) {
 500                 struct strbuf head_ref = STRBUF_INIT;
 501                 strbuf_addstr(&head_ref, branch_top);
 502                 strbuf_addstr(&head_ref, "HEAD");
 503                 create_symref(head_ref.buf,
 504                               remote_head_points_at->peer_ref->name,
 505                               msg);
 506         }
 507 }
 508
 509 static void update_head(const struct ref *our, const struct ref *remote,
 510                         const char *msg)
 511 {
 512         if (our && !prefixcmp(our->name, "refs/heads/")) {
 513                 /* Local default branch link */
 514                 create_symref("HEAD", our->name, NULL);
 515                 if (!option_bare) {
 516                         const char *head = skip_prefix(our->name, "refs/heads/");
 517                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 518                         install_branch_config(0, head, option_origin, our->name);
 519                 }
 520         } else if (our) {
 521                 struct commit *c = lookup_commit_reference(our->old_sha1);
 522                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 523                 update_ref(msg, "HEAD", c->object.sha1,
 524                            NULL, REF_NODEREF, DIE_ON_ERR);
 525         } else if (remote) {
 526                 /*
 527                  * We know remote HEAD points to a non-branch, or
 528                  * HEAD points to a branch but we don't know which one.
 529                  * Detach HEAD in all these cases.
 530                  */
 531                 update_ref(msg, "HEAD", remote->old_sha1,
 532                            NULL, REF_NODEREF, DIE_ON_ERR);
 533         }
 534 }
 535
 536 static int checkout(void)
 537 {
 538         unsigned char sha1[20];
 539         char *head;
 540         struct lock_file *lock_file;
 541         struct unpack_trees_options opts;
 542         struct tree *tree;
 543         struct tree_desc t;
 544         int err = 0, fd;
 545
 546         if (option_no_checkout)
 547                 return 0;
 548
 549         head = resolve_refdup("HEAD", sha1, 1, NULL);
 550         if (!head) {
 551                 warning(_("remote HEAD refers to nonexistent ref, "
 552                           "unable to checkout.\n"));
 553                 return 0;
 554         }
 555         if (!strcmp(head, "HEAD")) {
 556                 if (advice_detached_head)
 557                         detach_advice(sha1_to_hex(sha1));
 558         } else {
 559                 if (prefixcmp(head, "refs/heads/"))
 560                         die(_("HEAD not found below refs/heads!"));
 561         }
 562         free(head);
 563
 564         /* We need to be in the new work tree for the checkout */
 565         setup_work_tree();
 566
 567         lock_file = xcalloc(1, sizeof(struct lock_file));
 568         fd = hold_locked_index(lock_file, 1);
 569
 570         memset(&opts, 0, sizeof opts);
 571         opts.update = 1;
 572         opts.merge = 1;
 573         opts.fn = oneway_merge;
 574         opts.verbose_update = (option_verbosity >= 0);
 575         opts.src_index = &the_index;
 576         opts.dst_index = &the_index;
 577
 578         tree = parse_tree_indirect(sha1);
 579         parse_tree(tree);
 580         init_tree_desc(&t, tree->buffer, tree->size);
 581         unpack_trees(1, &t, &opts);
 582
 583         if (write_cache(fd, active_cache, active_nr) ||
 584             commit_locked_index(lock_file))
 585                 die(_("unable to write new index file"));
 586
 587         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 588                         sha1_to_hex(sha1), "1", NULL);
 589
 590         if (!err && option_recursive)
 591                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 592
 593         return err;
 594 }
 595
 596 static int write_one_config(const char *key, const char *value, void *data)
 597 {
 598         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 599 }
 600
 601 static void write_config(struct string_list *config)
 602 {
 603         int i;
 604
 605         for (i = 0; i < config->nr; i++) {
 606                 if (git_config_parse_parameter(config->items[i].string,
 607                                                write_one_config, NULL) < 0)
 608                         die("unable to write parameters to config file");
 609         }
 610 }
 611
 612 static void write_refspec_config(const char* src_ref_prefix,
 613                 const struct ref* our_head_points_at,
 614                 const struct ref* remote_head_points_at, struct strbuf* branch_top)
 615 {
 616         struct strbuf key = STRBUF_INIT;
 617         struct strbuf value = STRBUF_INIT;
 618
 619         if (option_mirror || !option_bare) {
 620                 if (option_single_branch && !option_mirror) {
 621                         if (option_branch) {
 622                                 if (strstr(our_head_points_at->name, "refs/tags/"))
 623                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 624                                                 our_head_points_at->name);
 625                                 else
 626                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 627                                                 branch_top->buf, option_branch);
 628                         } else if (remote_head_points_at) {
 629                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 630                                                 branch_top->buf,
 631                                                 skip_prefix(remote_head_points_at->name, "refs/heads/"));
 632                         }
 633                         /*
 634                          * otherwise, the next "git fetch" will
 635                          * simply fetch from HEAD without updating
 636                          * any remote tracking branch, which is what
 637                          * we want.
 638                          */
 639                 } else {
 640                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 641                 }
 642                 /* Configure the remote */
 643                 if (value.len) {
 644                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 645                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 646                         strbuf_reset(&key);
 647
 648                         if (option_mirror) {
 649                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 650                                 git_config_set(key.buf, "true");
 651                                 strbuf_reset(&key);
 652                         }
 653                 }
 654         }
 655
 656         strbuf_release(&key);
 657         strbuf_release(&value);
 658 }
 659
 660 int cmd_clone(int argc, const char **argv, const char *prefix)
 661 {
 662         int is_bundle = 0, is_local;
 663         struct stat buf;
 664         const char *repo_name, *repo, *work_tree, *git_dir;
 665         char *path, *dir;
 666         int dest_exists;
 667         const struct ref *refs, *remote_head;
 668         const struct ref *remote_head_points_at;
 669         const struct ref *our_head_points_at;
 670         struct ref *mapped_refs;
 671         const struct ref *ref;
 672         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 673         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 674         struct transport *transport = NULL;
 675         const char *src_ref_prefix = "refs/heads/";
 676         struct remote *remote;
 677         int err = 0, complete_refs_before_fetch = 1;
 678
 679         struct refspec *refspec;
 680         const char *fetch_pattern;
 681
 682         junk_pid = getpid();
 683
 684         packet_trace_identity("clone");
 685         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 686                              builtin_clone_usage, 0);
 687
 688         if (argc > 2)
 689                 usage_msg_opt(_("Too many arguments."),
 690                         builtin_clone_usage, builtin_clone_options);
 691
 692         if (argc == 0)
 693                 usage_msg_opt(_("You must specify a repository to clone."),
 694                         builtin_clone_usage, builtin_clone_options);
 695
 696         if (option_single_branch == -1)
 697                 option_single_branch = option_depth ? 1 : 0;
 698
 699         if (option_mirror)
 700                 option_bare = 1;
 701
 702         if (option_bare) {
 703                 if (option_origin)
 704                         die(_("--bare and --origin %s options are incompatible."),
 705                             option_origin);
 706                 if (real_git_dir)
 707                         die(_("--bare and --separate-git-dir are incompatible."));
 708                 option_no_checkout = 1;
 709         }
 710
 711         if (!option_origin)
 712                 option_origin = "origin";
 713
 714         repo_name = argv[0];
 715
 716         path = get_repo_path(repo_name, &is_bundle);
 717         if (path)
 718                 repo = xstrdup(absolute_path(repo_name));
 719         else if (!strchr(repo_name, ':'))
 720                 die(_("repository '%s' does not exist"), repo_name);
 721         else
 722                 repo = repo_name;
 723         is_local = option_local != 0 && path && !is_bundle;
 724         if (is_local && option_depth)
 725                 warning(_("--depth is ignored in local clones; use file:// instead."));
 726
 727         if (argc == 2)
 728                 dir = xstrdup(argv[1]);
 729         else
 730                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 731         strip_trailing_slashes(dir);
 732
 733         dest_exists = !stat(dir, &buf);
 734         if (dest_exists && !is_empty_dir(dir))
 735                 die(_("destination path '%s' already exists and is not "
 736                         "an empty directory."), dir);
 737
 738         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 739
 740         if (option_bare)
 741                 work_tree = NULL;
 742         else {
 743                 work_tree = getenv("GIT_WORK_TREE");
 744                 if (work_tree && !stat(work_tree, &buf))
 745                         die(_("working tree '%s' already exists."), work_tree);
 746         }
 747
 748         if (option_bare || work_tree)
 749                 git_dir = xstrdup(dir);
 750         else {
 751                 work_tree = dir;
 752                 git_dir = mkpathdup("%s/.git", dir);
 753         }
 754
 755         if (!option_bare) {
 756                 junk_work_tree = work_tree;
 757                 if (safe_create_leading_directories_const(work_tree) < 0)
 758                         die_errno(_("could not create leading directories of '%s'"),
 759                                   work_tree);
 760                 if (!dest_exists && mkdir(work_tree, 0777))
 761                         die_errno(_("could not create work tree dir '%s'."),
 762                                   work_tree);
 763                 set_git_work_tree(work_tree);
 764         }
 765         junk_git_dir = git_dir;
 766         atexit(remove_junk);
 767         sigchain_push_common(remove_junk_on_signal);
 768
 769         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
 770
 771         if (safe_create_leading_directories_const(git_dir) < 0)
 772                 die(_("could not create leading directories of '%s'"), git_dir);
 773
 774         set_git_dir_init(git_dir, real_git_dir, 0);
 775         if (real_git_dir) {
 776                 git_dir = real_git_dir;
 777                 junk_git_dir = real_git_dir;
 778         }
 779
 780         if (0 <= option_verbosity) {
 781                 if (option_bare)
 782                         printf(_("Cloning into bare repository '%s'...\n"), dir);
 783                 else
 784                         printf(_("Cloning into '%s'...\n"), dir);
 785         }
 786         init_db(option_template, INIT_DB_QUIET);
 787         write_config(&option_config);
 788
 789         /*
 790          * At this point, the config exists, so we do not need the
 791          * environment variable.  We actually need to unset it, too, to
 792          * re-enable parsing of the global configs.
 793          */
 794         unsetenv(CONFIG_ENVIRONMENT);
 795
 796         git_config(git_default_config, NULL);
 797
 798         if (option_bare) {
 799                 if (option_mirror)
 800                         src_ref_prefix = "refs/";
 801                 strbuf_addstr(&branch_top, src_ref_prefix);
 802
 803                 git_config_set("core.bare", "true");
 804         } else {
 805                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 806         }
 807
 808         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 809         strbuf_addf(&key, "remote.%s.url", option_origin);
 810         git_config_set(key.buf, repo);
 811         strbuf_reset(&key);
 812
 813         if (option_reference.nr)
 814                 setup_reference();
 815
 816         fetch_pattern = value.buf;
 817         refspec = parse_fetch_refspec(1, &fetch_pattern);
 818
 819         strbuf_reset(&value);
 820
 821         remote = remote_get(option_origin);
 822         transport = transport_get(remote, remote->url[0]);
 823
 824         if (!is_local) {
 825                 if (!transport->get_refs_list || !transport->fetch)
 826                         die(_("Don't know how to clone %s"), transport->url);
 827
 828                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 829
 830                 if (option_depth)
 831                         transport_set_option(transport, TRANS_OPT_DEPTH,
 832                                              option_depth);
 833                 if (option_single_branch)
 834                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 835
 836                 transport_set_verbosity(transport, option_verbosity, option_progress);
 837
 838                 if (option_upload_pack)
 839                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 840                                              option_upload_pack);
 841         }
 842
 843         refs = transport_get_remote_refs(transport);
 844
 845         if (refs) {
 846                 mapped_refs = wanted_peer_refs(refs, refspec);
 847                 /*
 848                  * transport_get_remote_refs() may return refs with null sha-1
 849                  * in mapped_refs (see struct transport->get_refs_list
 850                  * comment). In that case we need fetch it early because
 851                  * remote_head code below relies on it.
 852                  *
 853                  * for normal clones, transport_get_remote_refs() should
 854                  * return reliable ref set, we can delay cloning until after
 855                  * remote HEAD check.
 856                  */
 857                 for (ref = refs; ref; ref = ref->next)
 858                         if (is_null_sha1(ref->old_sha1)) {
 859                                 complete_refs_before_fetch = 0;
 860                                 break;
 861                         }
 862
 863                 if (!is_local && !complete_refs_before_fetch)
 864                         transport_fetch_refs(transport, mapped_refs);
 865
 866                 remote_head = find_ref_by_name(refs, "HEAD");
 867                 remote_head_points_at =
 868                         guess_remote_head(remote_head, mapped_refs, 0);
 869
 870                 if (option_branch) {
 871                         our_head_points_at =
 872                                 find_remote_branch(mapped_refs, option_branch);
 873
 874                         if (!our_head_points_at)
 875                                 die(_("Remote branch %s not found in upstream %s"),
 876                                     option_branch, option_origin);
 877                 }
 878                 else
 879                         our_head_points_at = remote_head_points_at;
 880         }
 881         else {
 882                 warning(_("You appear to have cloned an empty repository."));
 883                 mapped_refs = NULL;
 884                 our_head_points_at = NULL;
 885                 remote_head_points_at = NULL;
 886                 remote_head = NULL;
 887                 option_no_checkout = 1;
 888                 if (!option_bare)
 889                         install_branch_config(0, "master", option_origin,
 890                                               "refs/heads/master");
 891         }
 892
 893         write_refspec_config(src_ref_prefix, our_head_points_at,
 894                         remote_head_points_at, &branch_top);
 895
 896         if (is_local)
 897                 clone_local(path, git_dir);
 898         else if (refs && complete_refs_before_fetch)
 899                 transport_fetch_refs(transport, mapped_refs);
 900
 901         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 902                            branch_top.buf, reflog_msg.buf);
 903
 904         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 905
 906         transport_unlock_pack(transport);
 907         transport_disconnect(transport);
 908
 909         err = checkout();
 910
 911         strbuf_release(&reflog_msg);
 912         strbuf_release(&branch_top);
 913         strbuf_release(&key);
 914         strbuf_release(&value);
 915         junk_pid = 0;
 916         return err;
 917 }