253a7946ce4c82a4021565e49fed39befbd82192
   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 */
  35static const char * const builtin_clone_usage[] = {
  36        "git clone [options] [--] <repo> [<dir>]",
  37        NULL
  38};
  39
  40static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
  41static int option_local, option_no_hardlinks, option_shared, option_recursive;
  42static char *option_template, *option_depth;
  43static char *option_origin = NULL;
  44static char *option_branch = NULL;
  45static const char *real_git_dir;
  46static char *option_upload_pack = "git-upload-pack";
  47static int option_verbosity;
  48static int option_progress;
  49static struct string_list option_config;
  50static struct string_list option_reference;
  51
  52static 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
  61static 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
 104static const char *argv_submodule[] = {
 105        "submodule", "update", "--init", "--recursive", NULL
 106};
 107
 108static 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
 153static 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
 222static 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
 231static 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
 264static void setup_reference(void)
 265{
 266        for_each_string_list(&option_reference, add_one_reference, NULL);
 267}
 268
 269static 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
 303static 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
 366static 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
 387static const char *junk_work_tree;
 388static const char *junk_git_dir;
 389static pid_t junk_pid;
 390
 391static 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
 408static void remove_junk_on_signal(int signo)
 409{
 410        remove_junk();
 411        sigchain_pop(signo);
 412        raise(signo);
 413}
 414
 415static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
 416{
 417        struct ref *ref;
 418        struct strbuf head = STRBUF_INIT;
 419        strbuf_addstr(&head, "refs/heads/");
 420        strbuf_addstr(&head, branch);
 421        ref = find_ref_by_name(refs, head.buf);
 422        strbuf_release(&head);
 423        return ref;
 424}
 425
 426static struct ref *wanted_peer_refs(const struct ref *refs,
 427                struct refspec *refspec)
 428{
 429        struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 430        struct ref *local_refs = head;
 431        struct ref **tail = head ? &head->next : &local_refs;
 432
 433        if (option_single_branch) {
 434                struct ref *remote_head = NULL;
 435
 436                if (!option_branch)
 437                        remote_head = guess_remote_head(head, refs, 0);
 438                else
 439                        remote_head = find_remote_branch(refs, option_branch);
 440
 441                if (!remote_head && option_branch)
 442                        warning(_("Could not find remote branch %s to clone."),
 443                                option_branch);
 444                else
 445                        get_fetch_map(remote_head, refspec, &tail, 0);
 446        } else
 447                get_fetch_map(refs, refspec, &tail, 0);
 448
 449        if (!option_mirror && !option_single_branch)
 450                get_fetch_map(refs, tag_refspec, &tail, 0);
 451
 452        return local_refs;
 453}
 454
 455static void write_remote_refs(const struct ref *local_refs)
 456{
 457        const struct ref *r;
 458
 459        for (r = local_refs; r; r = r->next) {
 460                if (!r->peer_ref)
 461                        continue;
 462                add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
 463        }
 464
 465        pack_refs(PACK_REFS_ALL);
 466        clear_extra_refs();
 467}
 468
 469static void write_followtags(const struct ref *refs, const char *msg)
 470{
 471        const struct ref *ref;
 472        for (ref = refs; ref; ref = ref->next) {
 473                if (prefixcmp(ref->name, "refs/tags/"))
 474                        continue;
 475                if (!suffixcmp(ref->name, "^{}"))
 476                        continue;
 477                if (!has_sha1_file(ref->old_sha1))
 478                        continue;
 479                update_ref(msg, ref->name, ref->old_sha1,
 480                           NULL, 0, DIE_ON_ERR);
 481        }
 482}
 483
 484static void update_remote_refs(const struct ref *refs,
 485                               const struct ref *mapped_refs,
 486                               const struct ref *remote_head_points_at,
 487                               const char *branch_top,
 488                               const char *msg)
 489{
 490        if (refs) {
 491                clear_extra_refs();
 492                write_remote_refs(mapped_refs);
 493                if (option_single_branch)
 494                        write_followtags(refs, msg);
 495        }
 496
 497        if (remote_head_points_at && !option_bare) {
 498                struct strbuf head_ref = STRBUF_INIT;
 499                strbuf_addstr(&head_ref, branch_top);
 500                strbuf_addstr(&head_ref, "HEAD");
 501                create_symref(head_ref.buf,
 502                              remote_head_points_at->peer_ref->name,
 503                              msg);
 504        }
 505}
 506
 507static void update_head(const struct ref *our, const struct ref *remote,
 508                        const char *msg)
 509{
 510        if (our && !prefixcmp(our->name, "refs/heads/")) {
 511                /* Local default branch link */
 512                create_symref("HEAD", our->name, NULL);
 513                if (!option_bare) {
 514                        const char *head = skip_prefix(our->name, "refs/heads/");
 515                        update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 516                        install_branch_config(0, head, option_origin, our->name);
 517                }
 518        } else if (remote) {
 519                /*
 520                 * We know remote HEAD points to a non-branch, or
 521                 * HEAD points to a branch but we don't know which one, or
 522                 * we asked for a specific branch but it did not exist.
 523                 * Detach HEAD in all these cases.
 524                 */
 525                update_ref(msg, "HEAD", remote->old_sha1,
 526                           NULL, REF_NODEREF, DIE_ON_ERR);
 527        }
 528}
 529
 530static int checkout(void)
 531{
 532        unsigned char sha1[20];
 533        char *head;
 534        struct lock_file *lock_file;
 535        struct unpack_trees_options opts;
 536        struct tree *tree;
 537        struct tree_desc t;
 538        int err = 0, fd;
 539
 540        if (option_no_checkout)
 541                return 0;
 542
 543        head = resolve_refdup("HEAD", sha1, 1, NULL);
 544        if (!head) {
 545                warning(_("remote HEAD refers to nonexistent ref, "
 546                          "unable to checkout.\n"));
 547                return 0;
 548        }
 549        if (strcmp(head, "HEAD")) {
 550                if (prefixcmp(head, "refs/heads/"))
 551                        die(_("HEAD not found below refs/heads!"));
 552        }
 553        free(head);
 554
 555        /* We need to be in the new work tree for the checkout */
 556        setup_work_tree();
 557
 558        lock_file = xcalloc(1, sizeof(struct lock_file));
 559        fd = hold_locked_index(lock_file, 1);
 560
 561        memset(&opts, 0, sizeof opts);
 562        opts.update = 1;
 563        opts.merge = 1;
 564        opts.fn = oneway_merge;
 565        opts.verbose_update = (option_verbosity > 0);
 566        opts.src_index = &the_index;
 567        opts.dst_index = &the_index;
 568
 569        tree = parse_tree_indirect(sha1);
 570        parse_tree(tree);
 571        init_tree_desc(&t, tree->buffer, tree->size);
 572        unpack_trees(1, &t, &opts);
 573
 574        if (write_cache(fd, active_cache, active_nr) ||
 575            commit_locked_index(lock_file))
 576                die(_("unable to write new index file"));
 577
 578        err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 579                        sha1_to_hex(sha1), "1", NULL);
 580
 581        if (!err && option_recursive)
 582                err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 583
 584        return err;
 585}
 586
 587static int write_one_config(const char *key, const char *value, void *data)
 588{
 589        return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 590}
 591
 592static void write_config(struct string_list *config)
 593{
 594        int i;
 595
 596        for (i = 0; i < config->nr; i++) {
 597                if (git_config_parse_parameter(config->items[i].string,
 598                                               write_one_config, NULL) < 0)
 599                        die("unable to write parameters to config file");
 600        }
 601}
 602
 603int cmd_clone(int argc, const char **argv, const char *prefix)
 604{
 605        int is_bundle = 0, is_local;
 606        struct stat buf;
 607        const char *repo_name, *repo, *work_tree, *git_dir;
 608        char *path, *dir;
 609        int dest_exists;
 610        const struct ref *refs, *remote_head;
 611        const struct ref *remote_head_points_at;
 612        const struct ref *our_head_points_at;
 613        struct ref *mapped_refs;
 614        struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 615        struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 616        struct transport *transport = NULL;
 617        const char *src_ref_prefix = "refs/heads/";
 618        struct remote *remote;
 619        int err = 0;
 620
 621        struct refspec *refspec;
 622        const char *fetch_pattern;
 623
 624        junk_pid = getpid();
 625
 626        packet_trace_identity("clone");
 627        argc = parse_options(argc, argv, prefix, builtin_clone_options,
 628                             builtin_clone_usage, 0);
 629
 630        if (argc > 2)
 631                usage_msg_opt(_("Too many arguments."),
 632                        builtin_clone_usage, builtin_clone_options);
 633
 634        if (argc == 0)
 635                usage_msg_opt(_("You must specify a repository to clone."),
 636                        builtin_clone_usage, builtin_clone_options);
 637
 638        if (option_single_branch == -1)
 639                option_single_branch = option_depth ? 1 : 0;
 640
 641        if (option_mirror)
 642                option_bare = 1;
 643
 644        if (option_bare) {
 645                if (option_origin)
 646                        die(_("--bare and --origin %s options are incompatible."),
 647                            option_origin);
 648                option_no_checkout = 1;
 649        }
 650
 651        if (!option_origin)
 652                option_origin = "origin";
 653
 654        repo_name = argv[0];
 655
 656        path = get_repo_path(repo_name, &is_bundle);
 657        if (path)
 658                repo = xstrdup(absolute_path(repo_name));
 659        else if (!strchr(repo_name, ':'))
 660                die(_("repository '%s' does not exist"), repo_name);
 661        else
 662                repo = repo_name;
 663        is_local = path && !is_bundle;
 664        if (is_local && option_depth)
 665                warning(_("--depth is ignored in local clones; use file:// instead."));
 666
 667        if (argc == 2)
 668                dir = xstrdup(argv[1]);
 669        else
 670                dir = guess_dir_name(repo_name, is_bundle, option_bare);
 671        strip_trailing_slashes(dir);
 672
 673        dest_exists = !stat(dir, &buf);
 674        if (dest_exists && !is_empty_dir(dir))
 675                die(_("destination path '%s' already exists and is not "
 676                        "an empty directory."), dir);
 677
 678        strbuf_addf(&reflog_msg, "clone: from %s", repo);
 679
 680        if (option_bare)
 681                work_tree = NULL;
 682        else {
 683                work_tree = getenv("GIT_WORK_TREE");
 684                if (work_tree && !stat(work_tree, &buf))
 685                        die(_("working tree '%s' already exists."), work_tree);
 686        }
 687
 688        if (option_bare || work_tree)
 689                git_dir = xstrdup(dir);
 690        else {
 691                work_tree = dir;
 692                git_dir = xstrdup(mkpath("%s/.git", dir));
 693        }
 694
 695        if (!option_bare) {
 696                junk_work_tree = work_tree;
 697                if (safe_create_leading_directories_const(work_tree) < 0)
 698                        die_errno(_("could not create leading directories of '%s'"),
 699                                  work_tree);
 700                if (!dest_exists && mkdir(work_tree, 0755))
 701                        die_errno(_("could not create work tree dir '%s'."),
 702                                  work_tree);
 703                set_git_work_tree(work_tree);
 704        }
 705        junk_git_dir = git_dir;
 706        atexit(remove_junk);
 707        sigchain_push_common(remove_junk_on_signal);
 708
 709        setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
 710
 711        if (safe_create_leading_directories_const(git_dir) < 0)
 712                die(_("could not create leading directories of '%s'"), git_dir);
 713
 714        set_git_dir_init(git_dir, real_git_dir, 0);
 715        if (real_git_dir)
 716                git_dir = real_git_dir;
 717
 718        if (0 <= option_verbosity) {
 719                if (option_bare)
 720                        printf(_("Cloning into bare repository '%s'...\n"), dir);
 721                else
 722                        printf(_("Cloning into '%s'...\n"), dir);
 723        }
 724        init_db(option_template, INIT_DB_QUIET);
 725        write_config(&option_config);
 726
 727        /*
 728         * At this point, the config exists, so we do not need the
 729         * environment variable.  We actually need to unset it, too, to
 730         * re-enable parsing of the global configs.
 731         */
 732        unsetenv(CONFIG_ENVIRONMENT);
 733
 734        git_config(git_default_config, NULL);
 735
 736        if (option_bare) {
 737                if (option_mirror)
 738                        src_ref_prefix = "refs/";
 739                strbuf_addstr(&branch_top, src_ref_prefix);
 740
 741                git_config_set("core.bare", "true");
 742        } else {
 743                strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 744        }
 745
 746        strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 747
 748        if (option_mirror || !option_bare) {
 749                /* Configure the remote */
 750                strbuf_addf(&key, "remote.%s.fetch", option_origin);
 751                git_config_set_multivar(key.buf, value.buf, "^$", 0);
 752                strbuf_reset(&key);
 753
 754                if (option_mirror) {
 755                        strbuf_addf(&key, "remote.%s.mirror", option_origin);
 756                        git_config_set(key.buf, "true");
 757                        strbuf_reset(&key);
 758                }
 759        }
 760
 761        strbuf_addf(&key, "remote.%s.url", option_origin);
 762        git_config_set(key.buf, repo);
 763        strbuf_reset(&key);
 764
 765        if (option_reference.nr)
 766                setup_reference();
 767
 768        fetch_pattern = value.buf;
 769        refspec = parse_fetch_refspec(1, &fetch_pattern);
 770
 771        strbuf_reset(&value);
 772
 773        remote = remote_get(option_origin);
 774        transport = transport_get(remote, remote->url[0]);
 775
 776        if (!is_local) {
 777                if (!transport->get_refs_list || !transport->fetch)
 778                        die(_("Don't know how to clone %s"), transport->url);
 779
 780                transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 781
 782                if (option_depth)
 783                        transport_set_option(transport, TRANS_OPT_DEPTH,
 784                                             option_depth);
 785                if (option_single_branch)
 786                        transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 787
 788                transport_set_verbosity(transport, option_verbosity, option_progress);
 789
 790                if (option_upload_pack)
 791                        transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 792                                             option_upload_pack);
 793        }
 794
 795        refs = transport_get_remote_refs(transport);
 796        mapped_refs = refs ? wanted_peer_refs(refs, refspec) : NULL;
 797
 798        /*
 799         * mapped_refs may be updated if transport-helper is used so
 800         * we need fetch it early because remote_head code below
 801         * relies on it.
 802         *
 803         * for normal clones, transport_get_remote_refs() should
 804         * return reliable ref set, we can delay cloning until after
 805         * remote HEAD check.
 806         */
 807        if (!is_local && remote->foreign_vcs && refs)
 808                transport_fetch_refs(transport, mapped_refs);
 809
 810        if (refs) {
 811                remote_head = find_ref_by_name(refs, "HEAD");
 812                remote_head_points_at =
 813                        guess_remote_head(remote_head, mapped_refs, 0);
 814
 815                if (option_branch) {
 816                        our_head_points_at =
 817                                find_remote_branch(mapped_refs, option_branch);
 818
 819                        if (!our_head_points_at) {
 820                                warning(_("Remote branch %s not found in "
 821                                        "upstream %s, using HEAD instead"),
 822                                        option_branch, option_origin);
 823                                our_head_points_at = remote_head_points_at;
 824                        }
 825                }
 826                else
 827                        our_head_points_at = remote_head_points_at;
 828        }
 829        else {
 830                warning(_("You appear to have cloned an empty repository."));
 831                our_head_points_at = NULL;
 832                remote_head_points_at = NULL;
 833                remote_head = NULL;
 834                option_no_checkout = 1;
 835                if (!option_bare)
 836                        install_branch_config(0, "master", option_origin,
 837                                              "refs/heads/master");
 838        }
 839
 840        if (is_local)
 841                clone_local(path, git_dir);
 842        else if (refs && !remote->foreign_vcs)
 843                transport_fetch_refs(transport, mapped_refs);
 844
 845        update_remote_refs(refs, mapped_refs, remote_head_points_at,
 846                           branch_top.buf, reflog_msg.buf);
 847
 848        update_head(our_head_points_at, remote_head, reflog_msg.buf);
 849
 850        transport_unlock_pack(transport);
 851        transport_disconnect(transport);
 852
 853        err = checkout();
 854
 855        strbuf_release(&reflog_msg);
 856        strbuf_release(&branch_top);
 857        strbuf_release(&key);
 858        strbuf_release(&value);
 859        junk_pid = 0;
 860        return err;
 861}