Andrew's git - gitweb.git/blob

   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7#include "config.h"
   8#include "refs.h"
   9#include "builtin.h"
  10#include "exec_cmd.h"
  11#include "parse-options.h"
  12
  13#ifndef DEFAULT_GIT_TEMPLATE_DIR
  14#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
  15#endif
  16
  17#ifdef NO_TRUSTABLE_FILEMODE
  18#define TEST_FILEMODE 0
  19#else
  20#define TEST_FILEMODE 1
  21#endif
  22
  23static int init_is_bare_repository = 0;
  24static int init_shared_repository = -1;
  25static const char *init_db_template_dir;
  26
  27static void copy_templates_1(struct strbuf *path, struct strbuf *template_path,
  28                             DIR *dir)
  29{
  30        size_t path_baselen = path->len;
  31        size_t template_baselen = template_path->len;
  32        struct dirent *de;
  33
  34        /* Note: if ".git/hooks" file exists in the repository being
  35         * re-initialized, /etc/core-git/templates/hooks/update would
  36         * cause "git init" to fail here.  I think this is sane but
  37         * it means that the set of templates we ship by default, along
  38         * with the way the namespace under .git/ is organized, should
  39         * be really carefully chosen.
  40         */
  41        safe_create_dir(path->buf, 1);
  42        while ((de = readdir(dir)) != NULL) {
  43                struct stat st_git, st_template;
  44                int exists = 0;
  45
  46                strbuf_setlen(path, path_baselen);
  47                strbuf_setlen(template_path, template_baselen);
  48
  49                if (de->d_name[0] == '.')
  50                        continue;
  51                strbuf_addstr(path, de->d_name);
  52                strbuf_addstr(template_path, de->d_name);
  53                if (lstat(path->buf, &st_git)) {
  54                        if (errno != ENOENT)
  55                                die_errno(_("cannot stat '%s'"), path->buf);
  56                }
  57                else
  58                        exists = 1;
  59
  60                if (lstat(template_path->buf, &st_template))
  61                        die_errno(_("cannot stat template '%s'"), template_path->buf);
  62
  63                if (S_ISDIR(st_template.st_mode)) {
  64                        DIR *subdir = opendir(template_path->buf);
  65                        if (!subdir)
  66                                die_errno(_("cannot opendir '%s'"), template_path->buf);
  67                        strbuf_addch(path, '/');
  68                        strbuf_addch(template_path, '/');
  69                        copy_templates_1(path, template_path, subdir);
  70                        closedir(subdir);
  71                }
  72                else if (exists)
  73                        continue;
  74                else if (S_ISLNK(st_template.st_mode)) {
  75                        struct strbuf lnk = STRBUF_INIT;
  76                        if (strbuf_readlink(&lnk, template_path->buf, 0) < 0)
  77                                die_errno(_("cannot readlink '%s'"), template_path->buf);
  78                        if (symlink(lnk.buf, path->buf))
  79                                die_errno(_("cannot symlink '%s' '%s'"),
  80                                          lnk.buf, path->buf);
  81                        strbuf_release(&lnk);
  82                }
  83                else if (S_ISREG(st_template.st_mode)) {
  84                        if (copy_file(path->buf, template_path->buf, st_template.st_mode))
  85                                die_errno(_("cannot copy '%s' to '%s'"),
  86                                          template_path->buf, path->buf);
  87                }
  88                else
  89                        error(_("ignoring template %s"), template_path->buf);
  90        }
  91}
  92
  93static void copy_templates(const char *template_dir)
  94{
  95        struct strbuf path = STRBUF_INIT;
  96        struct strbuf template_path = STRBUF_INIT;
  97        size_t template_len;
  98        struct repository_format template_format;
  99        struct strbuf err = STRBUF_INIT;
 100        DIR *dir;
 101        char *to_free = NULL;
 102
 103        if (!template_dir)
 104                template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 105        if (!template_dir)
 106                template_dir = init_db_template_dir;
 107        if (!template_dir)
 108                template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 109        if (!template_dir[0]) {
 110                free(to_free);
 111                return;
 112        }
 113
 114        strbuf_addstr(&template_path, template_dir);
 115        strbuf_complete(&template_path, '/');
 116        template_len = template_path.len;
 117
 118        dir = opendir(template_path.buf);
 119        if (!dir) {
 120                warning(_("templates not found %s"), template_dir);
 121                goto free_return;
 122        }
 123
 124        /* Make sure that template is from the correct vintage */
 125        strbuf_addstr(&template_path, "config");
 126        read_repository_format(&template_format, template_path.buf);
 127        strbuf_setlen(&template_path, template_len);
 128
 129        /*
 130         * No mention of version at all is OK, but anything else should be
 131         * verified.
 132         */
 133        if (template_format.version >= 0 &&
 134            verify_repository_format(&template_format, &err) < 0) {
 135                warning(_("not copying templates from '%s': %s"),
 136                          template_dir, err.buf);
 137                strbuf_release(&err);
 138                goto close_free_return;
 139        }
 140
 141        strbuf_addstr(&path, get_git_common_dir());
 142        strbuf_complete(&path, '/');
 143        copy_templates_1(&path, &template_path, dir);
 144close_free_return:
 145        closedir(dir);
 146free_return:
 147        free(to_free);
 148        strbuf_release(&path);
 149        strbuf_release(&template_path);
 150}
 151
 152static int git_init_db_config(const char *k, const char *v, void *cb)
 153{
 154        if (!strcmp(k, "init.templatedir"))
 155                return git_config_pathname(&init_db_template_dir, k, v);
 156
 157        return 0;
 158}
 159
 160/*
 161 * If the git_dir is not directly inside the working tree, then git will not
 162 * find it by default, and we need to set the worktree explicitly.
 163 */
 164static int needs_work_tree_config(const char *git_dir, const char *work_tree)
 165{
 166        if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
 167                return 0;
 168        if (skip_prefix(git_dir, work_tree, &git_dir) &&
 169            !strcmp(git_dir, "/.git"))
 170                return 0;
 171        return 1;
 172}
 173
 174static int create_default_files(const char *template_path,
 175                                const char *original_git_dir)
 176{
 177        struct stat st1;
 178        struct strbuf buf = STRBUF_INIT;
 179        char *path;
 180        char repo_version_string[10];
 181        char junk[2];
 182        int reinit;
 183        int filemode;
 184        struct strbuf err = STRBUF_INIT;
 185
 186        /* Just look for `init.templatedir` */
 187        git_config(git_init_db_config, NULL);
 188
 189        /*
 190         * First copy the templates -- we might have the default
 191         * config file there, in which case we would want to read
 192         * from it after installing.
 193         *
 194         * Before reading that config, we also need to clear out any cached
 195         * values (since we've just potentially changed what's available on
 196         * disk).
 197         */
 198        copy_templates(template_path);
 199        git_config_clear();
 200        reset_shared_repository();
 201        git_config(git_default_config, NULL);
 202
 203        /*
 204         * We must make sure command-line options continue to override any
 205         * values we might have just re-read from the config.
 206         */
 207        is_bare_repository_cfg = init_is_bare_repository;
 208        if (init_shared_repository != -1)
 209                set_shared_repository(init_shared_repository);
 210
 211        /*
 212         * We would have created the above under user's umask -- under
 213         * shared-repository settings, we would need to fix them up.
 214         */
 215        if (get_shared_repository()) {
 216                adjust_shared_perm(get_git_dir());
 217        }
 218
 219        /*
 220         * We need to create a "refs" dir in any case so that older
 221         * versions of git can tell that this is a repository.
 222         */
 223        safe_create_dir(git_path("refs"), 1);
 224        adjust_shared_perm(git_path("refs"));
 225
 226        if (refs_init_db(&err))
 227                die("failed to set up refs db: %s", err.buf);
 228
 229        /*
 230         * Create the default symlink from ".git/HEAD" to the "master"
 231         * branch, if it does not exist yet.
 232         */
 233        path = git_path_buf(&buf, "HEAD");
 234        reinit = (!access(path, R_OK)
 235                  || readlink(path, junk, sizeof(junk)-1) != -1);
 236        if (!reinit) {
 237                if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 238                        exit(1);
 239        }
 240
 241        /* This forces creation of new config file */
 242        xsnprintf(repo_version_string, sizeof(repo_version_string),
 243                  "%d", GIT_REPO_VERSION);
 244        git_config_set("core.repositoryformatversion", repo_version_string);
 245
 246        /* Check filemode trustability */
 247        path = git_path_buf(&buf, "config");
 248        filemode = TEST_FILEMODE;
 249        if (TEST_FILEMODE && !lstat(path, &st1)) {
 250                struct stat st2;
 251                filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 252                                !lstat(path, &st2) &&
 253                                st1.st_mode != st2.st_mode &&
 254                                !chmod(path, st1.st_mode));
 255                if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 256                        filemode = 0;
 257        }
 258        git_config_set("core.filemode", filemode ? "true" : "false");
 259
 260        if (is_bare_repository())
 261                git_config_set("core.bare", "true");
 262        else {
 263                const char *work_tree = get_git_work_tree();
 264                git_config_set("core.bare", "false");
 265                /* allow template config file to override the default */
 266                if (log_all_ref_updates == LOG_REFS_UNSET)
 267                        git_config_set("core.logallrefupdates", "true");
 268                if (needs_work_tree_config(original_git_dir, work_tree))
 269                        git_config_set("core.worktree", work_tree);
 270        }
 271
 272        if (!reinit) {
 273                /* Check if symlink is supported in the work tree */
 274                path = git_path_buf(&buf, "tXXXXXX");
 275                if (!close(xmkstemp(path)) &&
 276                    !unlink(path) &&
 277                    !symlink("testing", path) &&
 278                    !lstat(path, &st1) &&
 279                    S_ISLNK(st1.st_mode))
 280                        unlink(path); /* good */
 281                else
 282                        git_config_set("core.symlinks", "false");
 283
 284                /* Check if the filesystem is case-insensitive */
 285                path = git_path_buf(&buf, "CoNfIg");
 286                if (!access(path, F_OK))
 287                        git_config_set("core.ignorecase", "true");
 288                probe_utf8_pathname_composition();
 289        }
 290
 291        strbuf_release(&buf);
 292        return reinit;
 293}
 294
 295static void create_object_directory(void)
 296{
 297        struct strbuf path = STRBUF_INIT;
 298        size_t baselen;
 299
 300        strbuf_addstr(&path, get_object_directory());
 301        baselen = path.len;
 302
 303        safe_create_dir(path.buf, 1);
 304
 305        strbuf_setlen(&path, baselen);
 306        strbuf_addstr(&path, "/pack");
 307        safe_create_dir(path.buf, 1);
 308
 309        strbuf_setlen(&path, baselen);
 310        strbuf_addstr(&path, "/info");
 311        safe_create_dir(path.buf, 1);
 312
 313        strbuf_release(&path);
 314}
 315
 316static void separate_git_dir(const char *git_dir, const char *git_link)
 317{
 318        struct stat st;
 319
 320        if (!stat(git_link, &st)) {
 321                const char *src;
 322
 323                if (S_ISREG(st.st_mode))
 324                        src = read_gitfile(git_link);
 325                else if (S_ISDIR(st.st_mode))
 326                        src = git_link;
 327                else
 328                        die(_("unable to handle file type %d"), (int)st.st_mode);
 329
 330                if (rename(src, git_dir))
 331                        die_errno(_("unable to move %s to %s"), src, git_dir);
 332        }
 333
 334        write_file(git_link, "gitdir: %s", git_dir);
 335}
 336
 337int init_db(const char *git_dir, const char *real_git_dir,
 338            const char *template_dir, unsigned int flags)
 339{
 340        int reinit;
 341        int exist_ok = flags & INIT_DB_EXIST_OK;
 342        char *original_git_dir = real_pathdup(git_dir, 1);
 343
 344        if (real_git_dir) {
 345                struct stat st;
 346
 347                if (!exist_ok && !stat(git_dir, &st))
 348                        die(_("%s already exists"), git_dir);
 349
 350                if (!exist_ok && !stat(real_git_dir, &st))
 351                        die(_("%s already exists"), real_git_dir);
 352
 353                set_git_dir(real_path(real_git_dir));
 354                git_dir = get_git_dir();
 355                separate_git_dir(git_dir, original_git_dir);
 356        }
 357        else {
 358                set_git_dir(real_path(git_dir));
 359                git_dir = get_git_dir();
 360        }
 361        startup_info->have_repository = 1;
 362
 363        safe_create_dir(git_dir, 0);
 364
 365        init_is_bare_repository = is_bare_repository();
 366
 367        /* Check to see if the repository version is right.
 368         * Note that a newly created repository does not have
 369         * config file, so this will not fail.  What we are catching
 370         * is an attempt to reinitialize new repository with an old tool.
 371         */
 372        check_repository_format();
 373
 374        reinit = create_default_files(template_dir, original_git_dir);
 375
 376        create_object_directory();
 377
 378        if (get_shared_repository()) {
 379                char buf[10];
 380                /* We do not spell "group" and such, so that
 381                 * the configuration can be read by older version
 382                 * of git. Note, we use octal numbers for new share modes,
 383                 * and compatibility values for PERM_GROUP and
 384                 * PERM_EVERYBODY.
 385                 */
 386                if (get_shared_repository() < 0)
 387                        /* force to the mode value */
 388                        xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
 389                else if (get_shared_repository() == PERM_GROUP)
 390                        xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 391                else if (get_shared_repository() == PERM_EVERYBODY)
 392                        xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 393                else
 394                        die("BUG: invalid value for shared_repository");
 395                git_config_set("core.sharedrepository", buf);
 396                git_config_set("receive.denyNonFastforwards", "true");
 397        }
 398
 399        if (!(flags & INIT_DB_QUIET)) {
 400                int len = strlen(git_dir);
 401
 402                if (reinit)
 403                        printf(get_shared_repository()
 404                               ? _("Reinitialized existing shared Git repository in %s%s\n")
 405                               : _("Reinitialized existing Git repository in %s%s\n"),
 406                               git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 407                else
 408                        printf(get_shared_repository()
 409                               ? _("Initialized empty shared Git repository in %s%s\n")
 410                               : _("Initialized empty Git repository in %s%s\n"),
 411                               git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 412        }
 413
 414        free(original_git_dir);
 415        return 0;
 416}
 417
 418static int guess_repository_type(const char *git_dir)
 419{
 420        const char *slash;
 421        char *cwd;
 422        int cwd_is_git_dir;
 423
 424        /*
 425         * "GIT_DIR=. git init" is always bare.
 426         * "GIT_DIR=`pwd` git init" too.
 427         */
 428        if (!strcmp(".", git_dir))
 429                return 1;
 430        cwd = xgetcwd();
 431        cwd_is_git_dir = !strcmp(git_dir, cwd);
 432        free(cwd);
 433        if (cwd_is_git_dir)
 434                return 1;
 435        /*
 436         * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 437         */
 438        if (!strcmp(git_dir, ".git"))
 439                return 0;
 440        slash = strrchr(git_dir, '/');
 441        if (slash && !strcmp(slash, "/.git"))
 442                return 0;
 443
 444        /*
 445         * Otherwise it is often bare.  At this point
 446         * we are just guessing.
 447         */
 448        return 1;
 449}
 450
 451static int shared_callback(const struct option *opt, const char *arg, int unset)
 452{
 453        *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 454        return 0;
 455}
 456
 457static const char *const init_db_usage[] = {
 458        N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 459        NULL
 460};
 461
 462/*
 463 * If you want to, you can share the DB area with any number of branches.
 464 * That has advantages: you can save space by sharing all the SHA1 objects.
 465 * On the other hand, it might just make lookup slower and messier. You
 466 * be the judge.  The default case is to have one DB per managed directory.
 467 */
 468int cmd_init_db(int argc, const char **argv, const char *prefix)
 469{
 470        const char *git_dir;
 471        const char *real_git_dir = NULL;
 472        const char *work_tree;
 473        const char *template_dir = NULL;
 474        unsigned int flags = 0;
 475        const struct option init_db_options[] = {
 476                OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 477                                N_("directory from which templates will be used")),
 478                OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 479                                N_("create a bare repository"), 1),
 480                { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 481                        N_("permissions"),
 482                        N_("specify that the git repository is to be shared amongst several users"),
 483                        PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 484                OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 485                OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 486                           N_("separate git dir from working tree")),
 487                OPT_END()
 488        };
 489
 490        argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 491
 492        if (real_git_dir && !is_absolute_path(real_git_dir))
 493                real_git_dir = real_pathdup(real_git_dir, 1);
 494
 495        if (argc == 1) {
 496                int mkdir_tried = 0;
 497        retry:
 498                if (chdir(argv[0]) < 0) {
 499                        if (!mkdir_tried) {
 500                                int saved;
 501                                /*
 502                                 * At this point we haven't read any configuration,
 503                                 * and we know shared_repository should always be 0;
 504                                 * but just in case we play safe.
 505                                 */
 506                                saved = get_shared_repository();
 507                                set_shared_repository(0);
 508                                switch (safe_create_leading_directories_const(argv[0])) {
 509                                case SCLD_OK:
 510                                case SCLD_PERMS:
 511                                        break;
 512                                case SCLD_EXISTS:
 513                                        errno = EEXIST;
 514                                        /* fallthru */
 515                                default:
 516                                        die_errno(_("cannot mkdir %s"), argv[0]);
 517                                        break;
 518                                }
 519                                set_shared_repository(saved);
 520                                if (mkdir(argv[0], 0777) < 0)
 521                                        die_errno(_("cannot mkdir %s"), argv[0]);
 522                                mkdir_tried = 1;
 523                                goto retry;
 524                        }
 525                        die_errno(_("cannot chdir to %s"), argv[0]);
 526                }
 527        } else if (0 < argc) {
 528                usage(init_db_usage[0]);
 529        }
 530        if (is_bare_repository_cfg == 1) {
 531                char *cwd = xgetcwd();
 532                setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 533                free(cwd);
 534        }
 535
 536        if (init_shared_repository != -1)
 537                set_shared_repository(init_shared_repository);
 538
 539        /*
 540         * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 541         * without --bare.  Catch the error early.
 542         */
 543        git_dir = getenv(GIT_DIR_ENVIRONMENT);
 544        work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 545        if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 546                die(_("%s (or --work-tree=<directory>) not allowed without "
 547                          "specifying %s (or --git-dir=<directory>)"),
 548                    GIT_WORK_TREE_ENVIRONMENT,
 549                    GIT_DIR_ENVIRONMENT);
 550
 551        /*
 552         * Set up the default .git directory contents
 553         */
 554        if (!git_dir)
 555                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 556
 557        if (is_bare_repository_cfg < 0)
 558                is_bare_repository_cfg = guess_repository_type(git_dir);
 559
 560        if (!is_bare_repository_cfg) {
 561                const char *git_dir_parent = strrchr(git_dir, '/');
 562                if (git_dir_parent) {
 563                        char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 564                        git_work_tree_cfg = real_pathdup(rel, 1);
 565                        free(rel);
 566                }
 567                if (!git_work_tree_cfg)
 568                        git_work_tree_cfg = xgetcwd();
 569                if (work_tree)
 570                        set_git_work_tree(work_tree);
 571                else
 572                        set_git_work_tree(git_work_tree_cfg);
 573                if (access(get_git_work_tree(), X_OK))
 574                        die_errno (_("Cannot access work tree '%s'"),
 575                                   get_git_work_tree());
 576        }
 577        else {
 578                if (work_tree)
 579                        set_git_work_tree(work_tree);
 580        }
 581
 582        UNLEAK(real_git_dir);
 583
 584        flags |= INIT_DB_EXIST_OK;
 585        return init_db(git_dir, real_git_dir, template_dir, flags);
 586}