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,
  77                                            st_template.st_size) < 0)
  78                                die_errno(_("cannot readlink '%s'"), template_path->buf);
  79                        if (symlink(lnk.buf, path->buf))
  80                                die_errno(_("cannot symlink '%s' '%s'"),
  81                                          lnk.buf, path->buf);
  82                        strbuf_release(&lnk);
  83                }
  84                else if (S_ISREG(st_template.st_mode)) {
  85                        if (copy_file(path->buf, template_path->buf, st_template.st_mode))
  86                                die_errno(_("cannot copy '%s' to '%s'"),
  87                                          template_path->buf, path->buf);
  88                }
  89                else
  90                        error(_("ignoring template %s"), template_path->buf);
  91        }
  92}
  93
  94static void copy_templates(const char *template_dir)
  95{
  96        struct strbuf path = STRBUF_INIT;
  97        struct strbuf template_path = STRBUF_INIT;
  98        size_t template_len;
  99        struct repository_format template_format = REPOSITORY_FORMAT_INIT;
 100        struct strbuf err = STRBUF_INIT;
 101        DIR *dir;
 102        char *to_free = NULL;
 103
 104        if (!template_dir)
 105                template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 106        if (!template_dir)
 107                template_dir = init_db_template_dir;
 108        if (!template_dir)
 109                template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 110        if (!template_dir[0]) {
 111                free(to_free);
 112                return;
 113        }
 114
 115        strbuf_addstr(&template_path, template_dir);
 116        strbuf_complete(&template_path, '/');
 117        template_len = template_path.len;
 118
 119        dir = opendir(template_path.buf);
 120        if (!dir) {
 121                warning(_("templates not found in %s"), template_dir);
 122                goto free_return;
 123        }
 124
 125        /* Make sure that template is from the correct vintage */
 126        strbuf_addstr(&template_path, "config");
 127        read_repository_format(&template_format, template_path.buf);
 128        strbuf_setlen(&template_path, template_len);
 129
 130        /*
 131         * No mention of version at all is OK, but anything else should be
 132         * verified.
 133         */
 134        if (template_format.version >= 0 &&
 135            verify_repository_format(&template_format, &err) < 0) {
 136                warning(_("not copying templates from '%s': %s"),
 137                          template_dir, err.buf);
 138                strbuf_release(&err);
 139                goto close_free_return;
 140        }
 141
 142        strbuf_addstr(&path, get_git_common_dir());
 143        strbuf_complete(&path, '/');
 144        copy_templates_1(&path, &template_path, dir);
 145close_free_return:
 146        closedir(dir);
 147free_return:
 148        free(to_free);
 149        strbuf_release(&path);
 150        strbuf_release(&template_path);
 151        clear_repository_format(&template_format);
 152}
 153
 154static int git_init_db_config(const char *k, const char *v, void *cb)
 155{
 156        if (!strcmp(k, "init.templatedir"))
 157                return git_config_pathname(&init_db_template_dir, k, v);
 158
 159        return 0;
 160}
 161
 162/*
 163 * If the git_dir is not directly inside the working tree, then git will not
 164 * find it by default, and we need to set the worktree explicitly.
 165 */
 166static int needs_work_tree_config(const char *git_dir, const char *work_tree)
 167{
 168        if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
 169                return 0;
 170        if (skip_prefix(git_dir, work_tree, &git_dir) &&
 171            !strcmp(git_dir, "/.git"))
 172                return 0;
 173        return 1;
 174}
 175
 176static int create_default_files(const char *template_path,
 177                                const char *original_git_dir)
 178{
 179        struct stat st1;
 180        struct strbuf buf = STRBUF_INIT;
 181        char *path;
 182        char repo_version_string[10];
 183        char junk[2];
 184        int reinit;
 185        int filemode;
 186        struct strbuf err = STRBUF_INIT;
 187
 188        /* Just look for `init.templatedir` */
 189        git_config(git_init_db_config, NULL);
 190
 191        /*
 192         * First copy the templates -- we might have the default
 193         * config file there, in which case we would want to read
 194         * from it after installing.
 195         *
 196         * Before reading that config, we also need to clear out any cached
 197         * values (since we've just potentially changed what's available on
 198         * disk).
 199         */
 200        copy_templates(template_path);
 201        git_config_clear();
 202        reset_shared_repository();
 203        git_config(git_default_config, NULL);
 204
 205        /*
 206         * We must make sure command-line options continue to override any
 207         * values we might have just re-read from the config.
 208         */
 209        is_bare_repository_cfg = init_is_bare_repository;
 210        if (init_shared_repository != -1)
 211                set_shared_repository(init_shared_repository);
 212
 213        /*
 214         * We would have created the above under user's umask -- under
 215         * shared-repository settings, we would need to fix them up.
 216         */
 217        if (get_shared_repository()) {
 218                adjust_shared_perm(get_git_dir());
 219        }
 220
 221        /*
 222         * We need to create a "refs" dir in any case so that older
 223         * versions of git can tell that this is a repository.
 224         */
 225        safe_create_dir(git_path("refs"), 1);
 226        adjust_shared_perm(git_path("refs"));
 227
 228        if (refs_init_db(&err))
 229                die("failed to set up refs db: %s", err.buf);
 230
 231        /*
 232         * Create the default symlink from ".git/HEAD" to the "master"
 233         * branch, if it does not exist yet.
 234         */
 235        path = git_path_buf(&buf, "HEAD");
 236        reinit = (!access(path, R_OK)
 237                  || readlink(path, junk, sizeof(junk)-1) != -1);
 238        if (!reinit) {
 239                if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 240                        exit(1);
 241        }
 242
 243        /* This forces creation of new config file */
 244        xsnprintf(repo_version_string, sizeof(repo_version_string),
 245                  "%d", GIT_REPO_VERSION);
 246        git_config_set("core.repositoryformatversion", repo_version_string);
 247
 248        /* Check filemode trustability */
 249        path = git_path_buf(&buf, "config");
 250        filemode = TEST_FILEMODE;
 251        if (TEST_FILEMODE && !lstat(path, &st1)) {
 252                struct stat st2;
 253                filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 254                                !lstat(path, &st2) &&
 255                                st1.st_mode != st2.st_mode &&
 256                                !chmod(path, st1.st_mode));
 257                if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 258                        filemode = 0;
 259        }
 260        git_config_set("core.filemode", filemode ? "true" : "false");
 261
 262        if (is_bare_repository())
 263                git_config_set("core.bare", "true");
 264        else {
 265                const char *work_tree = get_git_work_tree();
 266                git_config_set("core.bare", "false");
 267                /* allow template config file to override the default */
 268                if (log_all_ref_updates == LOG_REFS_UNSET)
 269                        git_config_set("core.logallrefupdates", "true");
 270                if (needs_work_tree_config(original_git_dir, work_tree))
 271                        git_config_set("core.worktree", work_tree);
 272        }
 273
 274        if (!reinit) {
 275                /* Check if symlink is supported in the work tree */
 276                path = git_path_buf(&buf, "tXXXXXX");
 277                if (!close(xmkstemp(path)) &&
 278                    !unlink(path) &&
 279                    !symlink("testing", path) &&
 280                    !lstat(path, &st1) &&
 281                    S_ISLNK(st1.st_mode))
 282                        unlink(path); /* good */
 283                else
 284                        git_config_set("core.symlinks", "false");
 285
 286                /* Check if the filesystem is case-insensitive */
 287                path = git_path_buf(&buf, "CoNfIg");
 288                if (!access(path, F_OK))
 289                        git_config_set("core.ignorecase", "true");
 290                probe_utf8_pathname_composition();
 291        }
 292
 293        strbuf_release(&buf);
 294        return reinit;
 295}
 296
 297static void create_object_directory(void)
 298{
 299        struct strbuf path = STRBUF_INIT;
 300        size_t baselen;
 301
 302        strbuf_addstr(&path, get_object_directory());
 303        baselen = path.len;
 304
 305        safe_create_dir(path.buf, 1);
 306
 307        strbuf_setlen(&path, baselen);
 308        strbuf_addstr(&path, "/pack");
 309        safe_create_dir(path.buf, 1);
 310
 311        strbuf_setlen(&path, baselen);
 312        strbuf_addstr(&path, "/info");
 313        safe_create_dir(path.buf, 1);
 314
 315        strbuf_release(&path);
 316}
 317
 318static void separate_git_dir(const char *git_dir, const char *git_link)
 319{
 320        struct stat st;
 321
 322        if (!stat(git_link, &st)) {
 323                const char *src;
 324
 325                if (S_ISREG(st.st_mode))
 326                        src = read_gitfile(git_link);
 327                else if (S_ISDIR(st.st_mode))
 328                        src = git_link;
 329                else
 330                        die(_("unable to handle file type %d"), (int)st.st_mode);
 331
 332                if (rename(src, git_dir))
 333                        die_errno(_("unable to move %s to %s"), src, git_dir);
 334        }
 335
 336        write_file(git_link, "gitdir: %s", git_dir);
 337}
 338
 339int init_db(const char *git_dir, const char *real_git_dir,
 340            const char *template_dir, unsigned int flags)
 341{
 342        int reinit;
 343        int exist_ok = flags & INIT_DB_EXIST_OK;
 344        char *original_git_dir = real_pathdup(git_dir, 1);
 345
 346        if (real_git_dir) {
 347                struct stat st;
 348
 349                if (!exist_ok && !stat(git_dir, &st))
 350                        die(_("%s already exists"), git_dir);
 351
 352                if (!exist_ok && !stat(real_git_dir, &st))
 353                        die(_("%s already exists"), real_git_dir);
 354
 355                set_git_dir(real_path(real_git_dir));
 356                git_dir = get_git_dir();
 357                separate_git_dir(git_dir, original_git_dir);
 358        }
 359        else {
 360                set_git_dir(real_path(git_dir));
 361                git_dir = get_git_dir();
 362        }
 363        startup_info->have_repository = 1;
 364
 365        safe_create_dir(git_dir, 0);
 366
 367        init_is_bare_repository = is_bare_repository();
 368
 369        /* Check to see if the repository version is right.
 370         * Note that a newly created repository does not have
 371         * config file, so this will not fail.  What we are catching
 372         * is an attempt to reinitialize new repository with an old tool.
 373         */
 374        check_repository_format();
 375
 376        reinit = create_default_files(template_dir, original_git_dir);
 377
 378        create_object_directory();
 379
 380        if (get_shared_repository()) {
 381                char buf[10];
 382                /* We do not spell "group" and such, so that
 383                 * the configuration can be read by older version
 384                 * of git. Note, we use octal numbers for new share modes,
 385                 * and compatibility values for PERM_GROUP and
 386                 * PERM_EVERYBODY.
 387                 */
 388                if (get_shared_repository() < 0)
 389                        /* force to the mode value */
 390                        xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
 391                else if (get_shared_repository() == PERM_GROUP)
 392                        xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 393                else if (get_shared_repository() == PERM_EVERYBODY)
 394                        xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 395                else
 396                        BUG("invalid value for shared_repository");
 397                git_config_set("core.sharedrepository", buf);
 398                git_config_set("receive.denyNonFastforwards", "true");
 399        }
 400
 401        if (!(flags & INIT_DB_QUIET)) {
 402                int len = strlen(git_dir);
 403
 404                if (reinit)
 405                        printf(get_shared_repository()
 406                               ? _("Reinitialized existing shared Git repository in %s%s\n")
 407                               : _("Reinitialized existing Git repository in %s%s\n"),
 408                               git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 409                else
 410                        printf(get_shared_repository()
 411                               ? _("Initialized empty shared Git repository in %s%s\n")
 412                               : _("Initialized empty Git repository in %s%s\n"),
 413                               git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 414        }
 415
 416        free(original_git_dir);
 417        return 0;
 418}
 419
 420static int guess_repository_type(const char *git_dir)
 421{
 422        const char *slash;
 423        char *cwd;
 424        int cwd_is_git_dir;
 425
 426        /*
 427         * "GIT_DIR=. git init" is always bare.
 428         * "GIT_DIR=`pwd` git init" too.
 429         */
 430        if (!strcmp(".", git_dir))
 431                return 1;
 432        cwd = xgetcwd();
 433        cwd_is_git_dir = !strcmp(git_dir, cwd);
 434        free(cwd);
 435        if (cwd_is_git_dir)
 436                return 1;
 437        /*
 438         * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 439         */
 440        if (!strcmp(git_dir, ".git"))
 441                return 0;
 442        slash = strrchr(git_dir, '/');
 443        if (slash && !strcmp(slash, "/.git"))
 444                return 0;
 445
 446        /*
 447         * Otherwise it is often bare.  At this point
 448         * we are just guessing.
 449         */
 450        return 1;
 451}
 452
 453static int shared_callback(const struct option *opt, const char *arg, int unset)
 454{
 455        BUG_ON_OPT_NEG(unset);
 456        *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 457        return 0;
 458}
 459
 460static const char *const init_db_usage[] = {
 461        N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 462        NULL
 463};
 464
 465/*
 466 * If you want to, you can share the DB area with any number of branches.
 467 * That has advantages: you can save space by sharing all the SHA1 objects.
 468 * On the other hand, it might just make lookup slower and messier. You
 469 * be the judge.  The default case is to have one DB per managed directory.
 470 */
 471int cmd_init_db(int argc, const char **argv, const char *prefix)
 472{
 473        const char *git_dir;
 474        const char *real_git_dir = NULL;
 475        const char *work_tree;
 476        const char *template_dir = NULL;
 477        unsigned int flags = 0;
 478        const struct option init_db_options[] = {
 479                OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 480                                N_("directory from which templates will be used")),
 481                OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 482                                N_("create a bare repository"), 1),
 483                { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 484                        N_("permissions"),
 485                        N_("specify that the git repository is to be shared amongst several users"),
 486                        PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 487                OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 488                OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 489                           N_("separate git dir from working tree")),
 490                OPT_END()
 491        };
 492
 493        argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 494
 495        if (real_git_dir && !is_absolute_path(real_git_dir))
 496                real_git_dir = real_pathdup(real_git_dir, 1);
 497
 498        if (argc == 1) {
 499                int mkdir_tried = 0;
 500        retry:
 501                if (chdir(argv[0]) < 0) {
 502                        if (!mkdir_tried) {
 503                                int saved;
 504                                /*
 505                                 * At this point we haven't read any configuration,
 506                                 * and we know shared_repository should always be 0;
 507                                 * but just in case we play safe.
 508                                 */
 509                                saved = get_shared_repository();
 510                                set_shared_repository(0);
 511                                switch (safe_create_leading_directories_const(argv[0])) {
 512                                case SCLD_OK:
 513                                case SCLD_PERMS:
 514                                        break;
 515                                case SCLD_EXISTS:
 516                                        errno = EEXIST;
 517                                        /* fallthru */
 518                                default:
 519                                        die_errno(_("cannot mkdir %s"), argv[0]);
 520                                        break;
 521                                }
 522                                set_shared_repository(saved);
 523                                if (mkdir(argv[0], 0777) < 0)
 524                                        die_errno(_("cannot mkdir %s"), argv[0]);
 525                                mkdir_tried = 1;
 526                                goto retry;
 527                        }
 528                        die_errno(_("cannot chdir to %s"), argv[0]);
 529                }
 530        } else if (0 < argc) {
 531                usage(init_db_usage[0]);
 532        }
 533        if (is_bare_repository_cfg == 1) {
 534                char *cwd = xgetcwd();
 535                setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 536                free(cwd);
 537        }
 538
 539        if (init_shared_repository != -1)
 540                set_shared_repository(init_shared_repository);
 541
 542        /*
 543         * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 544         * without --bare.  Catch the error early.
 545         */
 546        git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
 547        work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
 548        if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 549                die(_("%s (or --work-tree=<directory>) not allowed without "
 550                          "specifying %s (or --git-dir=<directory>)"),
 551                    GIT_WORK_TREE_ENVIRONMENT,
 552                    GIT_DIR_ENVIRONMENT);
 553
 554        /*
 555         * Set up the default .git directory contents
 556         */
 557        if (!git_dir)
 558                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 559
 560        if (is_bare_repository_cfg < 0)
 561                is_bare_repository_cfg = guess_repository_type(git_dir);
 562
 563        if (!is_bare_repository_cfg) {
 564                const char *git_dir_parent = strrchr(git_dir, '/');
 565                if (git_dir_parent) {
 566                        char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 567                        git_work_tree_cfg = real_pathdup(rel, 1);
 568                        free(rel);
 569                }
 570                if (!git_work_tree_cfg)
 571                        git_work_tree_cfg = xgetcwd();
 572                if (work_tree)
 573                        set_git_work_tree(work_tree);
 574                else
 575                        set_git_work_tree(git_work_tree_cfg);
 576                if (access(get_git_work_tree(), X_OK))
 577                        die_errno (_("Cannot access work tree '%s'"),
 578                                   get_git_work_tree());
 579        }
 580        else {
 581                if (work_tree)
 582                        set_git_work_tree(work_tree);
 583        }
 584
 585        UNLEAK(real_git_dir);
 586        UNLEAK(git_dir);
 587        UNLEAK(work_tree);
 588
 589        flags |= INIT_DB_EXIST_OK;
 590        return init_db(git_dir, real_git_dir, template_dir, flags);
 591}