builtin / clone.con commit clone: delay cloning until after remote HEAD checking (6f48d39)
   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;
  51static const char *src_ref_prefix = "refs/heads/";
  52
  53static 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
  62static struct option builtin_clone_options[] = {
  63        OPT__VERBOSITY(&option_verbosity),
  64        OPT_BOOLEAN(0, "progress", &option_progress,
  65                        "force progress reporting"),
  66        OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
  67                    "don't create a checkout"),
  68        OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
  69        { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
  70                "create a bare repository",
  71                PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
  72        OPT_BOOLEAN(0, "mirror", &option_mirror,
  73                    "create a mirror repository (implies bare)"),
  74        OPT_BOOLEAN('l', "local", &option_local,
  75                    "to clone from a local repository"),
  76        OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
  77                    "don't use local hardlinks, always copy"),
  78        OPT_BOOLEAN('s', "shared", &option_shared,
  79                    "setup as shared repository"),
  80        OPT_BOOLEAN(0, "recursive", &option_recursive,
  81                    "initialize submodules in the clone"),
  82        OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
  83                    "initialize submodules in the clone"),
  84        OPT_STRING(0, "template", &option_template, "template-directory",
  85                   "directory from which templates will be used"),
  86        OPT_CALLBACK(0 , "reference", &option_reference, "repo",
  87                     "reference repository", &opt_parse_reference),
  88        OPT_STRING('o', "origin", &option_origin, "name",
  89                   "use <name> instead of 'origin' to track upstream"),
  90        OPT_STRING('b', "branch", &option_branch, "branch",
  91                   "checkout <branch> instead of the remote's HEAD"),
  92        OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
  93                   "path to git-upload-pack on the remote"),
  94        OPT_STRING(0, "depth", &option_depth, "depth",
  95                    "create a shallow clone of that depth"),
  96        OPT_BOOL(0, "single-branch", &option_single_branch,
  97                    "clone only one branch, HEAD or --branch"),
  98        OPT_STRING(0, "separate-git-dir", &real_git_dir, "gitdir",
  99                   "separate git dir from working tree"),
 100        OPT_STRING_LIST('c', "config", &option_config, "key=value",
 101                        "set config inside the new repository"),
 102        OPT_END()
 103};
 104
 105static const char *argv_submodule[] = {
 106        "submodule", "update", "--init", "--recursive", NULL
 107};
 108
 109static char *get_repo_path(const char *repo, int *is_bundle)
 110{
 111        static char *suffix[] = { "/.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)) {
 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
 154static 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
 223static 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
 232static int add_one_reference(struct string_list_item *item, void *cb_data)
 233{
 234        char *ref_git;
 235        struct strbuf alternate = STRBUF_INIT;
 236        struct remote *remote;
 237        struct transport *transport;
 238        const struct ref *extra;
 239
 240        /* Beware: real_path() and mkpath() return static buffer */
 241        ref_git = xstrdup(real_path(item->string));
 242        if (is_directory(mkpath("%s/.git/objects", ref_git))) {
 243                char *ref_git_git = xstrdup(mkpath("%s/.git", ref_git));
 244                free(ref_git);
 245                ref_git = ref_git_git;
 246        } else if (!is_directory(mkpath("%s/objects", ref_git)))
 247                die(_("reference repository '%s' is not a local directory."),
 248                    item->string);
 249
 250        strbuf_addf(&alternate, "%s/objects", ref_git);
 251        add_to_alternates_file(alternate.buf);
 252        strbuf_release(&alternate);
 253
 254        remote = remote_get(ref_git);
 255        transport = transport_get(remote, ref_git);
 256        for (extra = transport_get_remote_refs(transport); extra;
 257             extra = extra->next)
 258                add_extra_ref(extra->name, extra->old_sha1, 0);
 259
 260        transport_disconnect(transport);
 261        free(ref_git);
 262        return 0;
 263}
 264
 265static void setup_reference(void)
 266{
 267        for_each_string_list(&option_reference, add_one_reference, NULL);
 268}
 269
 270static void copy_alternates(struct strbuf *src, struct strbuf *dst,
 271                            const char *src_repo)
 272{
 273        /*
 274         * Read from the source objects/info/alternates file
 275         * and copy the entries to corresponding file in the
 276         * destination repository with add_to_alternates_file().
 277         * Both src and dst have "$path/objects/info/alternates".
 278         *
 279         * Instead of copying bit-for-bit from the original,
 280         * we need to append to existing one so that the already
 281         * created entry via "clone -s" is not lost, and also
 282         * to turn entries with paths relative to the original
 283         * absolute, so that they can be used in the new repository.
 284         */
 285        FILE *in = fopen(src->buf, "r");
 286        struct strbuf line = STRBUF_INIT;
 287
 288        while (strbuf_getline(&line, in, '\n') != EOF) {
 289                char *abs_path, abs_buf[PATH_MAX];
 290                if (!line.len || line.buf[0] == '#')
 291                        continue;
 292                if (is_absolute_path(line.buf)) {
 293                        add_to_alternates_file(line.buf);
 294                        continue;
 295                }
 296                abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
 297                normalize_path_copy(abs_buf, abs_path);
 298                add_to_alternates_file(abs_buf);
 299        }
 300        strbuf_release(&line);
 301        fclose(in);
 302}
 303
 304static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 305                                   const char *src_repo, int src_baselen)
 306{
 307        struct dirent *de;
 308        struct stat buf;
 309        int src_len, dest_len;
 310        DIR *dir;
 311
 312        dir = opendir(src->buf);
 313        if (!dir)
 314                die_errno(_("failed to open '%s'"), src->buf);
 315
 316        if (mkdir(dest->buf, 0777)) {
 317                if (errno != EEXIST)
 318                        die_errno(_("failed to create directory '%s'"), dest->buf);
 319                else if (stat(dest->buf, &buf))
 320                        die_errno(_("failed to stat '%s'"), dest->buf);
 321                else if (!S_ISDIR(buf.st_mode))
 322                        die(_("%s exists and is not a directory"), dest->buf);
 323        }
 324
 325        strbuf_addch(src, '/');
 326        src_len = src->len;
 327        strbuf_addch(dest, '/');
 328        dest_len = dest->len;
 329
 330        while ((de = readdir(dir)) != NULL) {
 331                strbuf_setlen(src, src_len);
 332                strbuf_addstr(src, de->d_name);
 333                strbuf_setlen(dest, dest_len);
 334                strbuf_addstr(dest, de->d_name);
 335                if (stat(src->buf, &buf)) {
 336                        warning (_("failed to stat %s\n"), src->buf);
 337                        continue;
 338                }
 339                if (S_ISDIR(buf.st_mode)) {
 340                        if (de->d_name[0] != '.')
 341                                copy_or_link_directory(src, dest,
 342                                                       src_repo, src_baselen);
 343                        continue;
 344                }
 345
 346                /* Files that cannot be copied bit-for-bit... */
 347                if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
 348                        copy_alternates(src, dest, src_repo);
 349                        continue;
 350                }
 351
 352                if (unlink(dest->buf) && errno != ENOENT)
 353                        die_errno(_("failed to unlink '%s'"), dest->buf);
 354                if (!option_no_hardlinks) {
 355                        if (!link(src->buf, dest->buf))
 356                                continue;
 357                        if (option_local)
 358                                die_errno(_("failed to create link '%s'"), dest->buf);
 359                        option_no_hardlinks = 1;
 360                }
 361                if (copy_file_with_time(dest->buf, src->buf, 0666))
 362                        die_errno(_("failed to copy file to '%s'"), dest->buf);
 363        }
 364        closedir(dir);
 365}
 366
 367static void clone_local(const char *src_repo, const char *dest_repo)
 368{
 369        if (option_shared) {
 370                struct strbuf alt = STRBUF_INIT;
 371                strbuf_addf(&alt, "%s/objects", src_repo);
 372                add_to_alternates_file(alt.buf);
 373                strbuf_release(&alt);
 374        } else {
 375                struct strbuf src = STRBUF_INIT;
 376                struct strbuf dest = STRBUF_INIT;
 377                strbuf_addf(&src, "%s/objects", src_repo);
 378                strbuf_addf(&dest, "%s/objects", dest_repo);
 379                copy_or_link_directory(&src, &dest, src_repo, src.len);
 380                strbuf_release(&src);
 381                strbuf_release(&dest);
 382        }
 383
 384        if (0 <= option_verbosity)
 385                printf(_("done.\n"));
 386}
 387
 388static const char *junk_work_tree;
 389static const char *junk_git_dir;
 390static pid_t junk_pid;
 391
 392static void remove_junk(void)
 393{
 394        struct strbuf sb = STRBUF_INIT;
 395        if (getpid() != junk_pid)
 396                return;
 397        if (junk_git_dir) {
 398                strbuf_addstr(&sb, junk_git_dir);
 399                remove_dir_recursively(&sb, 0);
 400                strbuf_reset(&sb);
 401        }
 402        if (junk_work_tree) {
 403                strbuf_addstr(&sb, junk_work_tree);
 404                remove_dir_recursively(&sb, 0);
 405                strbuf_reset(&sb);
 406        }
 407}
 408
 409static void remove_junk_on_signal(int signo)
 410{
 411        remove_junk();
 412        sigchain_pop(signo);
 413        raise(signo);
 414}
 415
 416static struct ref *wanted_peer_refs(const struct ref *refs,
 417                struct refspec *refspec)
 418{
 419        struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
 420        struct ref *local_refs = head;
 421        struct ref **tail = head ? &head->next : &local_refs;
 422
 423        if (option_single_branch) {
 424                struct ref *remote_head = NULL;
 425
 426                if (!option_branch)
 427                        remote_head = guess_remote_head(head, refs, 0);
 428                else {
 429                        struct strbuf sb = STRBUF_INIT;
 430                        strbuf_addstr(&sb, src_ref_prefix);
 431                        strbuf_addstr(&sb, option_branch);
 432                        remote_head = find_ref_by_name(refs, sb.buf);
 433                        strbuf_release(&sb);
 434                }
 435
 436                if (!remote_head && option_branch)
 437                        warning(_("Could not find remote branch %s to clone."),
 438                                option_branch);
 439                else
 440                        get_fetch_map(remote_head, refspec, &tail, 0);
 441        } else
 442                get_fetch_map(refs, refspec, &tail, 0);
 443
 444        if (!option_mirror && !option_single_branch)
 445                get_fetch_map(refs, tag_refspec, &tail, 0);
 446
 447        return local_refs;
 448}
 449
 450static void write_remote_refs(const struct ref *local_refs)
 451{
 452        const struct ref *r;
 453
 454        for (r = local_refs; r; r = r->next) {
 455                if (!r->peer_ref)
 456                        continue;
 457                add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
 458        }
 459
 460        pack_refs(PACK_REFS_ALL);
 461        clear_extra_refs();
 462}
 463
 464static void write_followtags(const struct ref *refs, const char *msg)
 465{
 466        const struct ref *ref;
 467        for (ref = refs; ref; ref = ref->next) {
 468                if (prefixcmp(ref->name, "refs/tags/"))
 469                        continue;
 470                if (!suffixcmp(ref->name, "^{}"))
 471                        continue;
 472                if (!has_sha1_file(ref->old_sha1))
 473                        continue;
 474                update_ref(msg, ref->name, ref->old_sha1,
 475                           NULL, 0, DIE_ON_ERR);
 476        }
 477}
 478
 479static void update_remote_refs(const struct ref *refs,
 480                               const struct ref *mapped_refs,
 481                               const struct ref *remote_head_points_at,
 482                               const char *branch_top,
 483                               const char *msg)
 484{
 485        if (refs) {
 486                clear_extra_refs();
 487                write_remote_refs(mapped_refs);
 488                if (option_single_branch)
 489                        write_followtags(refs, msg);
 490        }
 491
 492        if (remote_head_points_at && !option_bare) {
 493                struct strbuf head_ref = STRBUF_INIT;
 494                strbuf_addstr(&head_ref, branch_top);
 495                strbuf_addstr(&head_ref, "HEAD");
 496                create_symref(head_ref.buf,
 497                              remote_head_points_at->peer_ref->name,
 498                              msg);
 499        }
 500}
 501
 502static void update_head(const struct ref *our, const struct ref *remote,
 503                        const char *msg)
 504{
 505        if (our) {
 506                /* Local default branch link */
 507                create_symref("HEAD", our->name, NULL);
 508                if (!option_bare) {
 509                        const char *head = skip_prefix(our->name, "refs/heads/");
 510                        update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
 511                        install_branch_config(0, head, option_origin, our->name);
 512                }
 513        } else if (remote) {
 514                /*
 515                 * We know remote HEAD points to a non-branch, or
 516                 * HEAD points to a branch but we don't know which one, or
 517                 * we asked for a specific branch but it did not exist.
 518                 * Detach HEAD in all these cases.
 519                 */
 520                update_ref(msg, "HEAD", remote->old_sha1,
 521                           NULL, REF_NODEREF, DIE_ON_ERR);
 522        }
 523}
 524
 525static int checkout(void)
 526{
 527        unsigned char sha1[20];
 528        char *head;
 529        struct lock_file *lock_file;
 530        struct unpack_trees_options opts;
 531        struct tree *tree;
 532        struct tree_desc t;
 533        int err = 0, fd;
 534
 535        if (option_no_checkout)
 536                return 0;
 537
 538        head = resolve_refdup("HEAD", sha1, 1, NULL);
 539        if (!head) {
 540                warning(_("remote HEAD refers to nonexistent ref, "
 541                          "unable to checkout.\n"));
 542                return 0;
 543        }
 544        if (strcmp(head, "HEAD")) {
 545                if (prefixcmp(head, "refs/heads/"))
 546                        die(_("HEAD not found below refs/heads!"));
 547        }
 548        free(head);
 549
 550        /* We need to be in the new work tree for the checkout */
 551        setup_work_tree();
 552
 553        lock_file = xcalloc(1, sizeof(struct lock_file));
 554        fd = hold_locked_index(lock_file, 1);
 555
 556        memset(&opts, 0, sizeof opts);
 557        opts.update = 1;
 558        opts.merge = 1;
 559        opts.fn = oneway_merge;
 560        opts.verbose_update = (option_verbosity > 0);
 561        opts.src_index = &the_index;
 562        opts.dst_index = &the_index;
 563
 564        tree = parse_tree_indirect(sha1);
 565        parse_tree(tree);
 566        init_tree_desc(&t, tree->buffer, tree->size);
 567        unpack_trees(1, &t, &opts);
 568
 569        if (write_cache(fd, active_cache, active_nr) ||
 570            commit_locked_index(lock_file))
 571                die(_("unable to write new index file"));
 572
 573        err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
 574                        sha1_to_hex(sha1), "1", NULL);
 575
 576        if (!err && option_recursive)
 577                err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
 578
 579        return err;
 580}
 581
 582static int write_one_config(const char *key, const char *value, void *data)
 583{
 584        return git_config_set_multivar(key, value ? value : "true", "^$", 0);
 585}
 586
 587static void write_config(struct string_list *config)
 588{
 589        int i;
 590
 591        for (i = 0; i < config->nr; i++) {
 592                if (git_config_parse_parameter(config->items[i].string,
 593                                               write_one_config, NULL) < 0)
 594                        die("unable to write parameters to config file");
 595        }
 596}
 597
 598int cmd_clone(int argc, const char **argv, const char *prefix)
 599{
 600        int is_bundle = 0, is_local;
 601        struct stat buf;
 602        const char *repo_name, *repo, *work_tree, *git_dir;
 603        char *path, *dir;
 604        int dest_exists;
 605        const struct ref *refs, *remote_head;
 606        const struct ref *remote_head_points_at;
 607        const struct ref *our_head_points_at;
 608        struct ref *mapped_refs;
 609        struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
 610        struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
 611        struct transport *transport = NULL;
 612        struct remote *remote;
 613        int err = 0;
 614
 615        struct refspec *refspec;
 616        const char *fetch_pattern;
 617
 618        junk_pid = getpid();
 619
 620        packet_trace_identity("clone");
 621        argc = parse_options(argc, argv, prefix, builtin_clone_options,
 622                             builtin_clone_usage, 0);
 623
 624        if (argc > 2)
 625                usage_msg_opt(_("Too many arguments."),
 626                        builtin_clone_usage, builtin_clone_options);
 627
 628        if (argc == 0)
 629                usage_msg_opt(_("You must specify a repository to clone."),
 630                        builtin_clone_usage, builtin_clone_options);
 631
 632        if (option_single_branch == -1)
 633                option_single_branch = option_depth ? 1 : 0;
 634
 635        if (option_mirror)
 636                option_bare = 1;
 637
 638        if (option_bare) {
 639                if (option_origin)
 640                        die(_("--bare and --origin %s options are incompatible."),
 641                            option_origin);
 642                option_no_checkout = 1;
 643        }
 644
 645        if (!option_origin)
 646                option_origin = "origin";
 647
 648        repo_name = argv[0];
 649
 650        path = get_repo_path(repo_name, &is_bundle);
 651        if (path)
 652                repo = xstrdup(absolute_path(repo_name));
 653        else if (!strchr(repo_name, ':'))
 654                die(_("repository '%s' does not exist"), repo_name);
 655        else
 656                repo = repo_name;
 657        is_local = path && !is_bundle;
 658        if (is_local && option_depth)
 659                warning(_("--depth is ignored in local clones; use file:// instead."));
 660
 661        if (argc == 2)
 662                dir = xstrdup(argv[1]);
 663        else
 664                dir = guess_dir_name(repo_name, is_bundle, option_bare);
 665        strip_trailing_slashes(dir);
 666
 667        dest_exists = !stat(dir, &buf);
 668        if (dest_exists && !is_empty_dir(dir))
 669                die(_("destination path '%s' already exists and is not "
 670                        "an empty directory."), dir);
 671
 672        strbuf_addf(&reflog_msg, "clone: from %s", repo);
 673
 674        if (option_bare)
 675                work_tree = NULL;
 676        else {
 677                work_tree = getenv("GIT_WORK_TREE");
 678                if (work_tree && !stat(work_tree, &buf))
 679                        die(_("working tree '%s' already exists."), work_tree);
 680        }
 681
 682        if (option_bare || work_tree)
 683                git_dir = xstrdup(dir);
 684        else {
 685                work_tree = dir;
 686                git_dir = xstrdup(mkpath("%s/.git", dir));
 687        }
 688
 689        if (!option_bare) {
 690                junk_work_tree = work_tree;
 691                if (safe_create_leading_directories_const(work_tree) < 0)
 692                        die_errno(_("could not create leading directories of '%s'"),
 693                                  work_tree);
 694                if (!dest_exists && mkdir(work_tree, 0755))
 695                        die_errno(_("could not create work tree dir '%s'."),
 696                                  work_tree);
 697                set_git_work_tree(work_tree);
 698        }
 699        junk_git_dir = git_dir;
 700        atexit(remove_junk);
 701        sigchain_push_common(remove_junk_on_signal);
 702
 703        setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
 704
 705        if (safe_create_leading_directories_const(git_dir) < 0)
 706                die(_("could not create leading directories of '%s'"), git_dir);
 707
 708        set_git_dir_init(git_dir, real_git_dir, 0);
 709        if (real_git_dir)
 710                git_dir = real_git_dir;
 711
 712        if (0 <= option_verbosity) {
 713                if (option_bare)
 714                        printf(_("Cloning into bare repository '%s'...\n"), dir);
 715                else
 716                        printf(_("Cloning into '%s'...\n"), dir);
 717        }
 718        init_db(option_template, INIT_DB_QUIET);
 719        write_config(&option_config);
 720
 721        /*
 722         * At this point, the config exists, so we do not need the
 723         * environment variable.  We actually need to unset it, too, to
 724         * re-enable parsing of the global configs.
 725         */
 726        unsetenv(CONFIG_ENVIRONMENT);
 727
 728        git_config(git_default_config, NULL);
 729
 730        if (option_bare) {
 731                if (option_mirror)
 732                        src_ref_prefix = "refs/";
 733                strbuf_addstr(&branch_top, src_ref_prefix);
 734
 735                git_config_set("core.bare", "true");
 736        } else {
 737                strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
 738        }
 739
 740        strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
 741
 742        if (option_mirror || !option_bare) {
 743                /* Configure the remote */
 744                strbuf_addf(&key, "remote.%s.fetch", option_origin);
 745                git_config_set_multivar(key.buf, value.buf, "^$", 0);
 746                strbuf_reset(&key);
 747
 748                if (option_mirror) {
 749                        strbuf_addf(&key, "remote.%s.mirror", option_origin);
 750                        git_config_set(key.buf, "true");
 751                        strbuf_reset(&key);
 752                }
 753        }
 754
 755        strbuf_addf(&key, "remote.%s.url", option_origin);
 756        git_config_set(key.buf, repo);
 757        strbuf_reset(&key);
 758
 759        if (option_reference.nr)
 760                setup_reference();
 761
 762        fetch_pattern = value.buf;
 763        refspec = parse_fetch_refspec(1, &fetch_pattern);
 764
 765        strbuf_reset(&value);
 766
 767        remote = remote_get(option_origin);
 768        transport = transport_get(remote, remote->url[0]);
 769
 770        if (!is_local) {
 771                if (!transport->get_refs_list || !transport->fetch)
 772                        die(_("Don't know how to clone %s"), transport->url);
 773
 774                transport_set_option(transport, TRANS_OPT_KEEP, "yes");
 775
 776                if (option_depth)
 777                        transport_set_option(transport, TRANS_OPT_DEPTH,
 778                                             option_depth);
 779                if (option_single_branch)
 780                        transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 781
 782                transport_set_verbosity(transport, option_verbosity, option_progress);
 783
 784                if (option_upload_pack)
 785                        transport_set_option(transport, TRANS_OPT_UPLOADPACK,
 786                                             option_upload_pack);
 787        }
 788
 789        refs = transport_get_remote_refs(transport);
 790        mapped_refs = refs ? wanted_peer_refs(refs, refspec) : NULL;
 791
 792        /*
 793         * mapped_refs may be updated if transport-helper is used so
 794         * we need fetch it early because remote_head code below
 795         * relies on it.
 796         *
 797         * for normal clones, transport_get_remote_refs() should
 798         * return reliable ref set, we can delay cloning until after
 799         * remote HEAD check.
 800         */
 801        if (!is_local && remote->foreign_vcs && refs)
 802                transport_fetch_refs(transport, mapped_refs);
 803
 804        if (refs) {
 805                remote_head = find_ref_by_name(refs, "HEAD");
 806                remote_head_points_at =
 807                        guess_remote_head(remote_head, mapped_refs, 0);
 808
 809                if (option_branch) {
 810                        struct strbuf head = STRBUF_INIT;
 811                        strbuf_addstr(&head, src_ref_prefix);
 812                        strbuf_addstr(&head, option_branch);
 813                        our_head_points_at =
 814                                find_ref_by_name(mapped_refs, head.buf);
 815                        strbuf_release(&head);
 816
 817                        if (!our_head_points_at) {
 818                                warning(_("Remote branch %s not found in "
 819                                        "upstream %s, using HEAD instead"),
 820                                        option_branch, option_origin);
 821                                our_head_points_at = remote_head_points_at;
 822                        }
 823                }
 824                else
 825                        our_head_points_at = remote_head_points_at;
 826        }
 827        else {
 828                warning(_("You appear to have cloned an empty repository."));
 829                our_head_points_at = NULL;
 830                remote_head_points_at = NULL;
 831                remote_head = NULL;
 832                option_no_checkout = 1;
 833                if (!option_bare)
 834                        install_branch_config(0, "master", option_origin,
 835                                              "refs/heads/master");
 836        }
 837
 838        if (is_local)
 839                clone_local(path, git_dir);
 840        else if (refs && !remote->foreign_vcs)
 841                transport_fetch_refs(transport, mapped_refs);
 842
 843        update_remote_refs(refs, mapped_refs, remote_head_points_at,
 844                           branch_top.buf, reflog_msg.buf);
 845
 846        update_head(our_head_points_at, remote_head, reflog_msg.buf);
 847
 848        transport_unlock_pack(transport);
 849        transport_disconnect(transport);
 850
 851        err = checkout();
 852
 853        strbuf_release(&reflog_msg);
 854        strbuf_release(&branch_top);
 855        strbuf_release(&key);
 856        strbuf_release(&value);
 857        junk_pid = 0;
 858        return err;
 859}