git.oblomov.eu Git - git/blob - 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 #include "connected.h"
  27
  28 /*
  29  * Overall FIXMEs:
  30  *  - respect DB_ENVIRONMENT for .git/objects.
  31  *
  32  * Implementation notes:
  33  *  - dropping use-separate-remote and no-separate-remote compatibility
  34  *
  35  */
  36 static const char * const builtin_clone_usage[] = {
  37         N_("git clone [options] [--] <repo> [<dir>]"),
  38         NULL
  39 };
  40
  41 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  42 static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
  43 static char *option_template, *option_depth;
  44 static char *option_origin = NULL;
  45 static char *option_branch = NULL;
  46 static const char *real_git_dir;
  47 static char *option_upload_pack = "git-upload-pack";
  48 static int option_verbosity;
  49 static int option_progress = -1;
  50 static struct string_list option_config;
  51 static struct string_list option_reference;
  52
  53 static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
  54 {
  55         struct string_list *option_reference = opt->value;
  56         if (!arg)
  57                 return -1;
  58         string_list_append(option_reference, arg);
  59         return 0;
  60 }
  61
  62 static struct option builtin_clone_options[] = {
  63         OPT__VERBOSITY(&option_verbosity),
  64         OPT_BOOL(0, "progress", &option_progress,
  65                  N_("force progress reporting")),
  66         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  67                     N_("don't create a checkout")),
  68         OPT_BOOLEAN(0, "bare", &option_bare, N_("create a bare repository")),
  69         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
  70                 N_("create a bare repository"),
  71                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
  72         OPT_BOOLEAN(0, "mirror", &option_mirror,
  73                     N_("create a mirror repository (implies bare)")),
  74         OPT_BOOL('l', "local", &option_local,
  75                 N_("to clone from a local repository")),
  76         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  77                     N_("don't use local hardlinks, always copy")),
  78         OPT_BOOLEAN('s', "shared", &option_shared,
  79                     N_("setup as shared repository")),
  80         OPT_BOOLEAN(0, "recursive", &option_recursive,
  81                     N_("initialize submodules in the clone")),
  82         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
  83                     N_("initialize submodules in the clone")),
  84         OPT_STRING(0, "template", &option_template, N_("template-directory"),
  85                    N_("directory from which templates will be used")),
  86         OPT_CALLBACK(0 , "reference", &option_reference, N_("repo"),
  87                      N_("reference repository"), &opt_parse_reference),
  88         OPT_STRING('o', "origin", &option_origin, N_("name"),
  89                    N_("use <name> instead of 'origin' to track upstream")),
  90         OPT_STRING('b', "branch", &option_branch, N_("branch"),
  91                    N_("checkout <branch> instead of the remote's HEAD")),
  92         OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
  93                    N_("path to git-upload-pack on the remote")),
  94         OPT_STRING(0, "depth", &option_depth, N_("depth"),
  95                     N_("create a shallow clone of that depth")),
  96         OPT_BOOL(0, "single-branch", &option_single_branch,
  97                     N_("clone only one branch, HEAD or --branch")),
  98         OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  99                    N_("separate git dir from working tree")),
 100         OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
 101                         N_("set config inside the new repository")),
 102         OPT_END()
 103 };
 104
 105 static const char *argv_submodule[] = {
 106         "submodule", "update", "--init", "--recursive", NULL
 107 };
 108
 109 static char *get_repo_path(const char *repo, int *is_bundle)
 110 {
 111         static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
 112         static char *bundle_suffix[] = { ".bundle", "" };
 113         struct stat st;
 114         int i;
 115
 116         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
 117                 const char *path;
 118                 path = mkpath("%s%s", repo, suffix[i]);
 119                 if (stat(path, &st))
 120                         continue;
 121                 if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
 122                         *is_bundle = 0;
 123                         return xstrdup(absolute_path(path));
 124                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
 125                         /* Is it a "gitfile"? */
 126                         char signature[8];
 127                         int len, fd = open(path, O_RDONLY);
 128                         if (fd < 0)
 129                                 continue;
 130                         len = read_in_full(fd, signature, 8);
 131                         close(fd);
 132                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
 133                                 continue;
 134                         path = read_gitfile(path);
 135                         if (path) {
 136                                 *is_bundle = 0;
 137                                 return xstrdup(absolute_path(path));
 138                         }
 139                 }
 140         }
 141
 142         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
 143                 const char *path;
 144                 path = mkpath("%s%s", repo, bundle_suffix[i]);
 145                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
 146                         *is_bundle = 1;
 147                         return xstrdup(absolute_path(path));
 148                 }
 149         }
 150
 151         return NULL;
 152 }
 153
 154 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 155 {
 156         const char *end = repo + strlen(repo), *start;
 157         char *dir;
 158
 159         /*
 160          * Strip trailing spaces, slashes and /.git
 161          */
 162         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
 163                 end--;
 164         if (end - repo > 5 && is_dir_sep(end[-5]) &&
 165             !strncmp(end - 4, ".git", 4)) {
 166                 end -= 5;
 167                 while (repo < end && is_dir_sep(end[-1]))
 168                         end--;
 169         }
 170
 171         /*
 172          * Find last component, but be prepared that repo could have
 173          * the form  "remote.example.com:foo.git", i.e. no slash
 174          * in the directory part.
 175          */
 176         start = end;
 177         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
 178                 start--;
 179
 180         /*
 181          * Strip .{bundle,git}.
 182          */
 183         if (is_bundle) {
 184                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
 185                         end -= 7;
 186         } else {
 187                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
 188                         end -= 4;
 189         }
 190
 191         if (is_bare) {
 192                 struct strbuf result = STRBUF_INIT;
 193                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
 194                 dir = strbuf_detach(&result, NULL);
 195         } else
 196                 dir = xstrndup(start, end - start);
 197         /*
 198          * Replace sequences of 'control' characters and whitespace
 199          * with one ascii space, remove leading and trailing spaces.
 200          */
 201         if (*dir) {
 202                 char *out = dir;
 203                 int prev_space = 1 /* strip leading whitespace */;
 204                 for (end = dir; *end; ++end) {
 205                         char ch = *end;
 206                         if ((unsigned char)ch < '\x20')
 207                                 ch = '\x20';
 208                         if (isspace(ch)) {
 209                                 if (prev_space)
 210                                         continue;
 211                                 prev_space = 1;
 212                         } else
 213                                 prev_space = 0;
 214                         *out++ = ch;
 215                 }
 216                 *out = '\0';
 217                 if (out > dir && prev_space)
 218                         out[-1] = '\0';
 219         }
 220         return dir;
 221 }
 222
 223 static void strip_trailing_slashes(char *dir)
 224 {
 225         char *end = dir + strlen(dir);
 226
 227         while (dir < end - 1 && is_dir_sep(end[-1]))
 228                 end--;
 229         *end = '\0';
 230 }
 231
 232 static int add_one_reference(struct string_list_item *item, void *cb_data)
 233 {
 234         char *ref_git;
 235         struct strbuf alternate = STRBUF_INIT;
 236
 237         /* Beware: real_path() and mkpath() return static buffer */
 238         ref_git = xstrdup(real_path(item->string));
 239         if (is_directory(mkpath("%s/.git/objects", ref_git))) {
 240                 char *ref_git_git = mkpathdup("%s/.git", ref_git);
 241                 free(ref_git);
 242                 ref_git = ref_git_git;
 243         } else if (!is_directory(mkpath("%s/objects", ref_git)))
 244                 die(_("reference repository '%s' is not a local directory."),
 245                     item->string);
 246
 247         strbuf_addf(&alternate, "%s/objects", ref_git);
 248         add_to_alternates_file(alternate.buf);
 249         strbuf_release(&alternate);
 250         free(ref_git);
 251         return 0;
 252 }
 253
 254 static void setup_reference(void)
 255 {
 256         for_each_string_list(&option_reference, add_one_reference, NULL);
 257 }
 258
 259 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 260                             const char *src_repo)
 261 {
 262         /*
 263          * Read from the source objects/info/alternates file
 264          * and copy the entries to corresponding file in the
 265          * destination repository with add_to_alternates_file().
 266          * Both src and dst have "$path/objects/info/alternates".
 267          *
 268          * Instead of copying bit-for-bit from the original,
 269          * we need to append to existing one so that the already
 270          * created entry via "clone -s" is not lost, and also
 271          * to turn entries with paths relative to the original
 272          * absolute, so that they can be used in the new repository.
 273          */
 274         FILE *in = fopen(src->buf, "r");
 275         struct strbuf line = STRBUF_INIT;
 276
 277         while (strbuf_getline(&line, in, '\n') != EOF) {
 278                 char *abs_path, abs_buf[PATH_MAX];
 279                 if (!line.len || line.buf[0] == '#')
 280                         continue;
 281                 if (is_absolute_path(line.buf)) {
 282                         add_to_alternates_file(line.buf);
 283                         continue;
 284                 }
 285                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
 286                 normalize_path_copy(abs_buf, abs_path);
 287                 add_to_alternates_file(abs_buf);
 288         }
 289         strbuf_release(&line);
 290         fclose(in);
 291 }
 292
 293 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 294                                    const char *src_repo, int src_baselen)
 295 {
 296         struct dirent *de;
 297         struct stat buf;
 298         int src_len, dest_len;
 299         DIR *dir;
 300
 301         dir = opendir(src->buf);
 302         if (!dir)
 303                 die_errno(_("failed to open '%s'"), src->buf);
 304
 305         if (mkdir(dest->buf, 0777)) {
 306                 if (errno != EEXIST)
 307                         die_errno(_("failed to create directory '%s'"), dest->buf);
 308                 else if (stat(dest->buf, &buf))
 309                         die_errno(_("failed to stat '%s'"), dest->buf);
 310                 else if (!S_ISDIR(buf.st_mode))
 311                         die(_("%s exists and is not a directory"), dest->buf);
 312         }
 313
 314         strbuf_addch(src, '/');
 315         src_len = src->len;
 316         strbuf_addch(dest, '/');
 317         dest_len = dest->len;
 318
 319         while ((de = readdir(dir)) != NULL) {
 320                 strbuf_setlen(src, src_len);
 321                 strbuf_addstr(src, de->d_name);
 322                 strbuf_setlen(dest, dest_len);
 323                 strbuf_addstr(dest, de->d_name);
 324                 if (stat(src->buf, &buf)) {
 325                         warning (_("failed to stat %s\n"), src->buf);
 326                         continue;
 327                 }
 328                 if (S_ISDIR(buf.st_mode)) {
 329                         if (de->d_name[0] != '.')
 330                                 copy_or_link_directory(src, dest,
 331                                                        src_repo, src_baselen);
 332                         continue;
 333                 }
 334
 335                 /* Files that cannot be copied bit-for-bit... */
 336                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 337                         copy_alternates(src, dest, src_repo);
 338                         continue;
 339                 }
 340
 341                 if (unlink(dest->buf) && errno != ENOENT)
 342                         die_errno(_("failed to unlink '%s'"), dest->buf);
 343                 if (!option_no_hardlinks) {
 344                         if (!link(src->buf, dest->buf))
 345                                 continue;
 346                         if (option_local > 0)
 347                                 die_errno(_("failed to create link '%s'"), dest->buf);
 348                         option_no_hardlinks = 1;
 349                 }
 350                 if (copy_file_with_time(dest->buf, src->buf, 0666))
 351                         die_errno(_("failed to copy file to '%s'"), dest->buf);
 352         }
 353         closedir(dir);
 354 }
 355
 356 static void clone_local(const char *src_repo, const char *dest_repo)
 357 {
 358         if (option_shared) {
 359                 struct strbuf alt = STRBUF_INIT;
 360                 strbuf_addf(&alt, "%s/objects", src_repo);
 361                 add_to_alternates_file(alt.buf);
 362                 strbuf_release(&alt);
 363         } else {
 364                 struct strbuf src = STRBUF_INIT;
 365                 struct strbuf dest = STRBUF_INIT;
 366                 strbuf_addf(&src, "%s/objects", src_repo);
 367                 strbuf_addf(&dest, "%s/objects", dest_repo);
 368                 copy_or_link_directory(&src, &dest, src_repo, src.len);
 369                 strbuf_release(&src);
 370                 strbuf_release(&dest);
 371         }
 372
 373         if (0 <= option_verbosity)
 374                 printf(_("done.\n"));
 375 }
 376
 377 static const char *junk_work_tree;
 378 static const char *junk_git_dir;
 379 static pid_t junk_pid;
 380
 381 static void remove_junk(void)
 382 {
 383         struct strbuf sb = STRBUF_INIT;
 384         if (getpid() != junk_pid)
 385                 return;
 386         if (junk_git_dir) {
 387                 strbuf_addstr(&sb, junk_git_dir);
 388                 remove_dir_recursively(&sb, 0);
 389                 strbuf_reset(&sb);
 390         }
 391         if (junk_work_tree) {
 392                 strbuf_addstr(&sb, junk_work_tree);
 393                 remove_dir_recursively(&sb, 0);
 394                 strbuf_reset(&sb);
 395         }
 396 }
 397
 398 static void remove_junk_on_signal(int signo)
 399 {
 400         remove_junk();
 401         sigchain_pop(signo);
 402         raise(signo);
 403 }
 404
 405 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 406 {
 407         struct ref *ref;
 408         struct strbuf head = STRBUF_INIT;
 409         strbuf_addstr(&head, "refs/heads/");
 410         strbuf_addstr(&head, branch);
 411         ref = find_ref_by_name(refs, head.buf);
 412         strbuf_release(&head);
 413
 414         if (ref)
 415                 return ref;
 416
 417         strbuf_addstr(&head, "refs/tags/");
 418         strbuf_addstr(&head, branch);
 419         ref = find_ref_by_name(refs, head.buf);
 420         strbuf_release(&head);
 421
 422         return ref;
 423 }
 424
 425 static struct ref *wanted_peer_refs(const struct ref *refs,
 426                 struct refspec *refspec)
 427 {
 428         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 429         struct ref *local_refs = head;
 430         struct ref **tail = head ? &head->next : &local_refs;
 431
 432         if (option_single_branch) {
 433                 struct ref *remote_head = NULL;
 434
 435                 if (!option_branch)
 436                         remote_head = guess_remote_head(head, refs, 0);
 437                 else {
 438                         local_refs = NULL;
 439                         tail = &local_refs;
 440                         remote_head = copy_ref(find_remote_branch(refs, option_branch));
 441                 }
 442
 443                 if (!remote_head && option_branch)
 444                         warning(_("Could not find remote branch %s to clone."),
 445                                 option_branch);
 446                 else {
 447                         get_fetch_map(remote_head, refspec, &tail, 0);
 448
 449                         /* if --branch=tag, pull the requested tag explicitly */
 450                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
 451                 }
 452         } else
 453                 get_fetch_map(refs, refspec, &tail, 0);
 454
 455         if (!option_mirror && !option_single_branch)
 456                 get_fetch_map(refs, tag_refspec, &tail, 0);
 457
 458         return local_refs;
 459 }
 460
 461 static void write_remote_refs(const struct ref *local_refs)
 462 {
 463         const struct ref *r;
 464
 465         for (r = local_refs; r; r = r->next) {
 466                 if (!r->peer_ref)
 467                         continue;
 468                 add_packed_ref(r->peer_ref->name, r->old_sha1);
 469         }
 470
 471         pack_refs(PACK_REFS_ALL);
 472 }
 473
 474 static void write_followtags(const struct ref *refs, const char *msg)
 475 {
 476         const struct ref *ref;
 477         for (ref = refs; ref; ref = ref->next) {
 478                 if (prefixcmp(ref->name, "refs/tags/"))
 479                         continue;
 480                 if (!suffixcmp(ref->name, "^{}"))
 481                         continue;
 482                 if (!has_sha1_file(ref->old_sha1))
 483                         continue;
 484                 update_ref(msg, ref->name, ref->old_sha1,
 485                            NULL, 0, DIE_ON_ERR);
 486         }
 487 }
 488
 489 static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 490 {
 491         struct ref **rm = cb_data;
 492         struct ref *ref = *rm;
 493
 494         /*
 495          * Skip anything missing a peer_ref, which we are not
 496          * actually going to write a ref for.
 497          */
 498         while (ref && !ref->peer_ref)
 499                 ref = ref->next;
 500         /* Returning -1 notes "end of list" to the caller. */
 501         if (!ref)
 502                 return -1;
 503
 504         hashcpy(sha1, ref->old_sha1);
 505         *rm = ref->next;
 506         return 0;
 507 }
 508
 509 static void update_remote_refs(const struct ref *refs,
 510                                const struct ref *mapped_refs,
 511                                const struct ref *remote_head_points_at,
 512                                const char *branch_top,
 513                                const char *msg)
 514 {
 515         const struct ref *rm = mapped_refs;
 516
 517         if (check_everything_connected(iterate_ref_map, 0, &rm))
 518                 die(_("remote did not send all necessary objects"));
 519
 520         if (refs) {
 521                 write_remote_refs(mapped_refs);
 522                 if (option_single_branch)
 523                         write_followtags(refs, msg);
 524         }
 525
 526         if (remote_head_points_at && !option_bare) {
 527                 struct strbuf head_ref = STRBUF_INIT;
 528                 strbuf_addstr(&head_ref, branch_top);
 529                 strbuf_addstr(&head_ref, "HEAD");
 530                 create_symref(head_ref.buf,
 531                               remote_head_points_at->peer_ref->name,
 532                               msg);
 533         }
 534 }
 535
 536 static void update_head(const struct ref *our, const struct ref *remote,
 537                         const char *msg)
 538 {
 539         if (our && !prefixcmp(our->name, "refs/heads/")) {
 540                 /* Local default branch link */
 541                 create_symref("HEAD", our->name, NULL);
 542                 if (!option_bare) {
 543                         const char *head = skip_prefix(our->name, "refs/heads/");
 544                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 545                         install_branch_config(0, head, option_origin, our->name);
 546                 }
 547         } else if (our) {
 548                 struct commit *c = lookup_commit_reference(our->old_sha1);
 549                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
 550                 update_ref(msg, "HEAD", c->object.sha1,
 551                            NULL, REF_NODEREF, DIE_ON_ERR);
 552         } else if (remote) {
 553                 /*
 554                  * We know remote HEAD points to a non-branch, or
 555                  * HEAD points to a branch but we don't know which one.
 556                  * Detach HEAD in all these cases.
 557                  */
 558                 update_ref(msg, "HEAD", remote->old_sha1,
 559                            NULL, REF_NODEREF, DIE_ON_ERR);
 560         }
 561 }
 562
 563 static int checkout(void)
 564 {
 565         unsigned char sha1[20];
 566         char *head;
 567         struct lock_file *lock_file;
 568         struct unpack_trees_options opts;
 569         struct tree *tree;
 570         struct tree_desc t;
 571         int err = 0, fd;
 572
 573         if (option_no_checkout)
 574                 return 0;
 575
 576         head = resolve_refdup("HEAD", sha1, 1, NULL);
 577         if (!head) {
 578                 warning(_("remote HEAD refers to nonexistent ref, "
 579                           "unable to checkout.\n"));
 580                 return 0;
 581         }
 582         if (!strcmp(head, "HEAD")) {
 583                 if (advice_detached_head)
 584                         detach_advice(sha1_to_hex(sha1));
 585         } else {
 586                 if (prefixcmp(head, "refs/heads/"))
 587                         die(_("HEAD not found below refs/heads!"));
 588         }
 589         free(head);
 590
 591         /* We need to be in the new work tree for the checkout */
 592         setup_work_tree();
 593
 594         lock_file = xcalloc(1, sizeof(struct lock_file));
 595         fd = hold_locked_index(lock_file, 1);
 596
 597         memset(&opts, 0, sizeof opts);
 598         opts.update = 1;
 599         opts.merge = 1;
 600         opts.fn = oneway_merge;
 601         opts.verbose_update = (option_verbosity >= 0);
 602         opts.src_index = &the_index;
 603         opts.dst_index = &the_index;
 604
 605         tree = parse_tree_indirect(sha1);
 606         parse_tree(tree);
 607         init_tree_desc(&t, tree->buffer, tree->size);
 608         if (unpack_trees(1, &t, &opts) < 0)
 609                 die(_("unable to checkout working tree"));
 610
 611         if (write_cache(fd, active_cache, active_nr) ||
 612             commit_locked_index(lock_file))
 613                 die(_("unable to write new index file"));
 614
 615         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 616                         sha1_to_hex(sha1), "1", NULL);
 617
 618         if (!err && option_recursive)
 619                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 620
 621         return err;
 622 }
 623
 624 static int write_one_config(const char *key, const char *value, void *data)
 625 {
 626         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 627 }
 628
 629 static void write_config(struct string_list *config)
 630 {
 631         int i;
 632
 633         for (i = 0; i < config->nr; i++) {
 634                 if (git_config_parse_parameter(config->items[i].string,
 635                                                write_one_config, NULL) < 0)
 636                         die("unable to write parameters to config file");
 637         }
 638 }
 639
 640 static void write_refspec_config(const char* src_ref_prefix,
 641                 const struct ref* our_head_points_at,
 642                 const struct ref* remote_head_points_at, struct strbuf* branch_top)
 643 {
 644         struct strbuf key = STRBUF_INIT;
 645         struct strbuf value = STRBUF_INIT;
 646
 647         if (option_mirror || !option_bare) {
 648                 if (option_single_branch && !option_mirror) {
 649                         if (option_branch) {
 650                                 if (strstr(our_head_points_at->name, "refs/tags/"))
 651                                         strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
 652                                                 our_head_points_at->name);
 653                                 else
 654                                         strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
 655                                                 branch_top->buf, option_branch);
 656                         } else if (remote_head_points_at) {
 657                                 strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
 658                                                 branch_top->buf,
 659                                                 skip_prefix(remote_head_points_at->name, "refs/heads/"));
 660                         }
 661                         /*
 662                          * otherwise, the next "git fetch" will
 663                          * simply fetch from HEAD without updating
 664                          * any remote tracking branch, which is what
 665                          * we want.
 666                          */
 667                 } else {
 668                         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
 669                 }
 670                 /* Configure the remote */
 671                 if (value.len) {
 672                         strbuf_addf(&key, "remote.%s.fetch", option_origin);
 673                         git_config_set_multivar(key.buf, value.buf, "^$", 0);
 674                         strbuf_reset(&key);
 675
 676                         if (option_mirror) {
 677                                 strbuf_addf(&key, "remote.%s.mirror", option_origin);
 678                                 git_config_set(key.buf, "true");
 679                                 strbuf_reset(&key);
 680                         }
 681                 }
 682         }
 683
 684         strbuf_release(&key);
 685         strbuf_release(&value);
 686 }
 687
 688 int cmd_clone(int argc, const char **argv, const char *prefix)
 689 {
 690         int is_bundle = 0, is_local;
 691         struct stat buf;
 692         const char *repo_name, *repo, *work_tree, *git_dir;
 693         char *path, *dir;
 694         int dest_exists;
 695         const struct ref *refs, *remote_head;
 696         const struct ref *remote_head_points_at;
 697         const struct ref *our_head_points_at;
 698         struct ref *mapped_refs;
 699         const struct ref *ref;
 700         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 701         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 702         struct transport *transport = NULL;
 703         const char *src_ref_prefix = "refs/heads/";
 704         struct remote *remote;
 705         int err = 0, complete_refs_before_fetch = 1;
 706
 707         struct refspec *refspec;
 708         const char *fetch_pattern;
 709
 710         junk_pid = getpid();
 711
 712         packet_trace_identity("clone");
 713         argc = parse_options(argc, argv, prefix, builtin_clone_options,
 714                              builtin_clone_usage, 0);
 715
 716         if (argc > 2)
 717                 usage_msg_opt(_("Too many arguments."),
 718                         builtin_clone_usage, builtin_clone_options);
 719
 720         if (argc == 0)
 721                 usage_msg_opt(_("You must specify a repository to clone."),
 722                         builtin_clone_usage, builtin_clone_options);
 723
 724         if (option_single_branch == -1)
 725                 option_single_branch = option_depth ? 1 : 0;
 726
 727         if (option_mirror)
 728                 option_bare = 1;
 729
 730         if (option_bare) {
 731                 if (option_origin)
 732                         die(_("--bare and --origin %s options are incompatible."),
 733                             option_origin);
 734                 if (real_git_dir)
 735                         die(_("--bare and --separate-git-dir are incompatible."));
 736                 option_no_checkout = 1;
 737         }
 738
 739         if (!option_origin)
 740                 option_origin = "origin";
 741
 742         repo_name = argv[0];
 743
 744         path = get_repo_path(repo_name, &is_bundle);
 745         if (path)
 746                 repo = xstrdup(absolute_path(repo_name));
 747         else if (!strchr(repo_name, ':'))
 748                 die(_("repository '%s' does not exist"), repo_name);
 749         else
 750                 repo = repo_name;
 751         is_local = option_local != 0 && path && !is_bundle;
 752         if (is_local && option_depth)
 753                 warning(_("--depth is ignored in local clones; use file:// instead."));
 754
 755         if (argc == 2)
 756                 dir = xstrdup(argv[1]);
 757         else
 758                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
 759         strip_trailing_slashes(dir);
 760
 761         dest_exists = !stat(dir, &buf);
 762         if (dest_exists && !is_empty_dir(dir))
 763                 die(_("destination path '%s' already exists and is not "
 764                         "an empty directory."), dir);
 765
 766         strbuf_addf(&reflog_msg, "clone: from %s", repo);
 767
 768         if (option_bare)
 769                 work_tree = NULL;
 770         else {
 771                 work_tree = getenv("GIT_WORK_TREE");
 772                 if (work_tree && !stat(work_tree, &buf))
 773                         die(_("working tree '%s' already exists."), work_tree);
 774         }
 775
 776         if (option_bare || work_tree)
 777                 git_dir = xstrdup(dir);
 778         else {
 779                 work_tree = dir;
 780                 git_dir = mkpathdup("%s/.git", dir);
 781         }
 782
 783         if (!option_bare) {
 784                 junk_work_tree = work_tree;
 785                 if (safe_create_leading_directories_const(work_tree) < 0)
 786                         die_errno(_("could not create leading directories of '%s'"),
 787                                   work_tree);
 788                 if (!dest_exists && mkdir(work_tree, 0777))
 789                         die_errno(_("could not create work tree dir '%s'."),
 790                                   work_tree);
 791                 set_git_work_tree(work_tree);
 792         }
 793         junk_git_dir = git_dir;
 794         atexit(remove_junk);
 795         sigchain_push_common(remove_junk_on_signal);
 796
 797         if (safe_create_leading_directories_const(git_dir) < 0)
 798                 die(_("could not create leading directories of '%s'"), git_dir);
 799
 800         set_git_dir_init(git_dir, real_git_dir, 0);
 801         if (real_git_dir) {
 802                 git_dir = real_git_dir;
 803                 junk_git_dir = real_git_dir;
 804         }
 805
 806         if (0 <= option_verbosity) {
 807                 if (option_bare)
 808                         printf(_("Cloning into bare repository '%s'...\n"), dir);
 809                 else
 810                         printf(_("Cloning into '%s'...\n"), dir);
 811         }
 812         init_db(option_template, INIT_DB_QUIET);
 813         write_config(&option_config);
 814
 815         git_config(git_default_config, NULL);
 816
 817         if (option_bare) {
 818                 if (option_mirror)
 819                         src_ref_prefix = "refs/";
 820                 strbuf_addstr(&branch_top, src_ref_prefix);
 821
 822                 git_config_set("core.bare", "true");
 823         } else {
 824                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 825         }
 826
 827         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 828         strbuf_addf(&key, "remote.%s.url", option_origin);
 829         git_config_set(key.buf, repo);
 830         strbuf_reset(&key);
 831
 832         if (option_reference.nr)
 833                 setup_reference();
 834
 835         fetch_pattern = value.buf;
 836         refspec = parse_fetch_refspec(1, &fetch_pattern);
 837
 838         strbuf_reset(&value);
 839
 840         remote = remote_get(option_origin);
 841         transport = transport_get(remote, remote->url[0]);
 842
 843         if (!is_local) {
 844                 if (!transport->get_refs_list || !transport->fetch)
 845                         die(_("Don't know how to clone %s"), transport->url);
 846
 847                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 848
 849                 if (option_depth)
 850                         transport_set_option(transport, TRANS_OPT_DEPTH,
 851                                              option_depth);
 852                 if (option_single_branch)
 853                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 854
 855                 transport_set_verbosity(transport, option_verbosity, option_progress);
 856
 857                 if (option_upload_pack)
 858                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 859                                              option_upload_pack);
 860         }
 861
 862         refs = transport_get_remote_refs(transport);
 863
 864         if (refs) {
 865                 mapped_refs = wanted_peer_refs(refs, refspec);
 866                 /*
 867                  * transport_get_remote_refs() may return refs with null sha-1
 868                  * in mapped_refs (see struct transport->get_refs_list
 869                  * comment). In that case we need fetch it early because
 870                  * remote_head code below relies on it.
 871                  *
 872                  * for normal clones, transport_get_remote_refs() should
 873                  * return reliable ref set, we can delay cloning until after
 874                  * remote HEAD check.
 875                  */
 876                 for (ref = refs; ref; ref = ref->next)
 877                         if (is_null_sha1(ref->old_sha1)) {
 878                                 complete_refs_before_fetch = 0;
 879                                 break;
 880                         }
 881
 882                 if (!is_local && !complete_refs_before_fetch)
 883                         transport_fetch_refs(transport, mapped_refs);
 884
 885                 remote_head = find_ref_by_name(refs, "HEAD");
 886                 remote_head_points_at =
 887                         guess_remote_head(remote_head, mapped_refs, 0);
 888
 889                 if (option_branch) {
 890                         our_head_points_at =
 891                                 find_remote_branch(mapped_refs, option_branch);
 892
 893                         if (!our_head_points_at)
 894                                 die(_("Remote branch %s not found in upstream %s"),
 895                                     option_branch, option_origin);
 896                 }
 897                 else
 898                         our_head_points_at = remote_head_points_at;
 899         }
 900         else {
 901                 warning(_("You appear to have cloned an empty repository."));
 902                 mapped_refs = NULL;
 903                 our_head_points_at = NULL;
 904                 remote_head_points_at = NULL;
 905                 remote_head = NULL;
 906                 option_no_checkout = 1;
 907                 if (!option_bare)
 908                         install_branch_config(0, "master", option_origin,
 909                                               "refs/heads/master");
 910         }
 911
 912         write_refspec_config(src_ref_prefix, our_head_points_at,
 913                         remote_head_points_at, &branch_top);
 914
 915         if (is_local)
 916                 clone_local(path, git_dir);
 917         else if (refs && complete_refs_before_fetch)
 918                 transport_fetch_refs(transport, mapped_refs);
 919
 920         update_remote_refs(refs, mapped_refs, remote_head_points_at,
 921                            branch_top.buf, reflog_msg.buf);
 922
 923         update_head(our_head_points_at, remote_head, reflog_msg.buf);
 924
 925         transport_unlock_pack(transport);
 926         transport_disconnect(transport);
 927
 928         err = checkout();
 929
 930         strbuf_release(&reflog_msg);
 931         strbuf_release(&branch_top);
 932         strbuf_release(&key);
 933         strbuf_release(&value);
 934         junk_pid = 0;
 935         return err;
 936 }