Andrew's git / gitweb.git / builtin/init-db.c
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builtin / init-db.con commit init: kill git_link variable (822d940)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7#include "refs.h"
   8#include "builtin.h"
   9#include "exec_cmd.h"
  10#include "parse-options.h"
  11
  12#ifndef DEFAULT_GIT_TEMPLATE_DIR
  13#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
  14#endif
  15
  16#ifdef NO_TRUSTABLE_FILEMODE
  17#define TEST_FILEMODE 0
  18#else
  19#define TEST_FILEMODE 1
  20#endif
  21
  22static int init_is_bare_repository = 0;
  23static int init_shared_repository = -1;
  24static const char *init_db_template_dir;
  25
  26static void copy_templates_1(struct strbuf *path, struct strbuf *template,
  27                             DIR *dir)
  28{
  29        size_t path_baselen = path->len;
  30        size_t template_baselen = template->len;
  31        struct dirent *de;
  32
  33        /* Note: if ".git/hooks" file exists in the repository being
  34         * re-initialized, /etc/core-git/templates/hooks/update would
  35         * cause "git init" to fail here.  I think this is sane but
  36         * it means that the set of templates we ship by default, along
  37         * with the way the namespace under .git/ is organized, should
  38         * be really carefully chosen.
  39         */
  40        safe_create_dir(path->buf, 1);
  41        while ((de = readdir(dir)) != NULL) {
  42                struct stat st_git, st_template;
  43                int exists = 0;
  44
  45                strbuf_setlen(path, path_baselen);
  46                strbuf_setlen(template, template_baselen);
  47
  48                if (de->d_name[0] == '.')
  49                        continue;
  50                strbuf_addstr(path, de->d_name);
  51                strbuf_addstr(template, de->d_name);
  52                if (lstat(path->buf, &st_git)) {
  53                        if (errno != ENOENT)
  54                                die_errno(_("cannot stat '%s'"), path->buf);
  55                }
  56                else
  57                        exists = 1;
  58
  59                if (lstat(template->buf, &st_template))
  60                        die_errno(_("cannot stat template '%s'"), template->buf);
  61
  62                if (S_ISDIR(st_template.st_mode)) {
  63                        DIR *subdir = opendir(template->buf);
  64                        if (!subdir)
  65                                die_errno(_("cannot opendir '%s'"), template->buf);
  66                        strbuf_addch(path, '/');
  67                        strbuf_addch(template, '/');
  68                        copy_templates_1(path, template, subdir);
  69                        closedir(subdir);
  70                }
  71                else if (exists)
  72                        continue;
  73                else if (S_ISLNK(st_template.st_mode)) {
  74                        struct strbuf lnk = STRBUF_INIT;
  75                        if (strbuf_readlink(&lnk, template->buf, 0) < 0)
  76                                die_errno(_("cannot readlink '%s'"), template->buf);
  77                        if (symlink(lnk.buf, path->buf))
  78                                die_errno(_("cannot symlink '%s' '%s'"),
  79                                          lnk.buf, path->buf);
  80                        strbuf_release(&lnk);
  81                }
  82                else if (S_ISREG(st_template.st_mode)) {
  83                        if (copy_file(path->buf, template->buf, st_template.st_mode))
  84                                die_errno(_("cannot copy '%s' to '%s'"),
  85                                          template->buf, path->buf);
  86                }
  87                else
  88                        error(_("ignoring template %s"), template->buf);
  89        }
  90}
  91
  92static void copy_templates(const char *template_dir)
  93{
  94        struct strbuf path = STRBUF_INIT;
  95        struct strbuf template_path = STRBUF_INIT;
  96        size_t template_len;
  97        struct repository_format template_format;
  98        struct strbuf err = STRBUF_INIT;
  99        DIR *dir;
 100        char *to_free = NULL;
 101
 102        if (!template_dir)
 103                template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 104        if (!template_dir)
 105                template_dir = init_db_template_dir;
 106        if (!template_dir)
 107                template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 108        if (!template_dir[0]) {
 109                free(to_free);
 110                return;
 111        }
 112
 113        strbuf_addstr(&template_path, template_dir);
 114        strbuf_complete(&template_path, '/');
 115        template_len = template_path.len;
 116
 117        dir = opendir(template_path.buf);
 118        if (!dir) {
 119                warning(_("templates not found %s"), template_dir);
 120                goto free_return;
 121        }
 122
 123        /* Make sure that template is from the correct vintage */
 124        strbuf_addstr(&template_path, "config");
 125        read_repository_format(&template_format, template_path.buf);
 126        strbuf_setlen(&template_path, template_len);
 127
 128        /*
 129         * No mention of version at all is OK, but anything else should be
 130         * verified.
 131         */
 132        if (template_format.version >= 0 &&
 133            verify_repository_format(&template_format, &err) < 0) {
 134                warning(_("not copying templates from '%s': %s"),
 135                          template_dir, err.buf);
 136                strbuf_release(&err);
 137                goto close_free_return;
 138        }
 139
 140        strbuf_addstr(&path, get_git_common_dir());
 141        strbuf_complete(&path, '/');
 142        copy_templates_1(&path, &template_path, dir);
 143close_free_return:
 144        closedir(dir);
 145free_return:
 146        free(to_free);
 147        strbuf_release(&path);
 148        strbuf_release(&template_path);
 149}
 150
 151static int git_init_db_config(const char *k, const char *v, void *cb)
 152{
 153        if (!strcmp(k, "init.templatedir"))
 154                return git_config_pathname(&init_db_template_dir, k, v);
 155
 156        return 0;
 157}
 158
 159/*
 160 * If the git_dir is not directly inside the working tree, then git will not
 161 * find it by default, and we need to set the worktree explicitly.
 162 */
 163static int needs_work_tree_config(const char *git_dir, const char *work_tree)
 164{
 165        if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
 166                return 0;
 167        if (skip_prefix(git_dir, work_tree, &git_dir) &&
 168            !strcmp(git_dir, "/.git"))
 169                return 0;
 170        return 1;
 171}
 172
 173static int create_default_files(const char *template_path,
 174                                const char *original_git_dir)
 175{
 176        struct stat st1;
 177        struct strbuf buf = STRBUF_INIT;
 178        char *path;
 179        char repo_version_string[10];
 180        char junk[2];
 181        int reinit;
 182        int filemode;
 183
 184        /*
 185         * Create .git/refs/{heads,tags}
 186         */
 187        safe_create_dir(git_path_buf(&buf, "refs"), 1);
 188        safe_create_dir(git_path_buf(&buf, "refs/heads"), 1);
 189        safe_create_dir(git_path_buf(&buf, "refs/tags"), 1);
 190
 191        /* Just look for `init.templatedir` */
 192        git_config(git_init_db_config, NULL);
 193
 194        /*
 195         * First copy the templates -- we might have the default
 196         * config file there, in which case we would want to read
 197         * from it after installing.
 198         *
 199         * Before reading that config, we also need to clear out any cached
 200         * values (since we've just potentially changed what's available on
 201         * disk).
 202         */
 203        copy_templates(template_path);
 204        git_config_clear();
 205        reset_shared_repository();
 206        git_config(git_default_config, NULL);
 207
 208        /*
 209         * We must make sure command-line options continue to override any
 210         * values we might have just re-read from the config.
 211         */
 212        is_bare_repository_cfg = init_is_bare_repository;
 213        if (init_shared_repository != -1)
 214                set_shared_repository(init_shared_repository);
 215
 216        /*
 217         * We would have created the above under user's umask -- under
 218         * shared-repository settings, we would need to fix them up.
 219         */
 220        if (get_shared_repository()) {
 221                adjust_shared_perm(get_git_dir());
 222                adjust_shared_perm(git_path_buf(&buf, "refs"));
 223                adjust_shared_perm(git_path_buf(&buf, "refs/heads"));
 224                adjust_shared_perm(git_path_buf(&buf, "refs/tags"));
 225        }
 226
 227        /*
 228         * Create the default symlink from ".git/HEAD" to the "master"
 229         * branch, if it does not exist yet.
 230         */
 231        path = git_path_buf(&buf, "HEAD");
 232        reinit = (!access(path, R_OK)
 233                  || readlink(path, junk, sizeof(junk)-1) != -1);
 234        if (!reinit) {
 235                if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 236                        exit(1);
 237        }
 238
 239        /* This forces creation of new config file */
 240        xsnprintf(repo_version_string, sizeof(repo_version_string),
 241                  "%d", GIT_REPO_VERSION);
 242        git_config_set("core.repositoryformatversion", repo_version_string);
 243
 244        /* Check filemode trustability */
 245        path = git_path_buf(&buf, "config");
 246        filemode = TEST_FILEMODE;
 247        if (TEST_FILEMODE && !lstat(path, &st1)) {
 248                struct stat st2;
 249                filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 250                                !lstat(path, &st2) &&
 251                                st1.st_mode != st2.st_mode &&
 252                                !chmod(path, st1.st_mode));
 253                if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 254                        filemode = 0;
 255        }
 256        git_config_set("core.filemode", filemode ? "true" : "false");
 257
 258        if (is_bare_repository())
 259                git_config_set("core.bare", "true");
 260        else {
 261                const char *work_tree = get_git_work_tree();
 262                git_config_set("core.bare", "false");
 263                /* allow template config file to override the default */
 264                if (log_all_ref_updates == -1)
 265                        git_config_set("core.logallrefupdates", "true");
 266                if (needs_work_tree_config(original_git_dir, work_tree))
 267                        git_config_set("core.worktree", work_tree);
 268        }
 269
 270        if (!reinit) {
 271                /* Check if symlink is supported in the work tree */
 272                path = git_path_buf(&buf, "tXXXXXX");
 273                if (!close(xmkstemp(path)) &&
 274                    !unlink(path) &&
 275                    !symlink("testing", path) &&
 276                    !lstat(path, &st1) &&
 277                    S_ISLNK(st1.st_mode))
 278                        unlink(path); /* good */
 279                else
 280                        git_config_set("core.symlinks", "false");
 281
 282                /* Check if the filesystem is case-insensitive */
 283                path = git_path_buf(&buf, "CoNfIg");
 284                if (!access(path, F_OK))
 285                        git_config_set("core.ignorecase", "true");
 286                probe_utf8_pathname_composition();
 287        }
 288
 289        strbuf_release(&buf);
 290        return reinit;
 291}
 292
 293static void create_object_directory(void)
 294{
 295        struct strbuf path = STRBUF_INIT;
 296        size_t baselen;
 297
 298        strbuf_addstr(&path, get_object_directory());
 299        baselen = path.len;
 300
 301        safe_create_dir(path.buf, 1);
 302
 303        strbuf_setlen(&path, baselen);
 304        strbuf_addstr(&path, "/pack");
 305        safe_create_dir(path.buf, 1);
 306
 307        strbuf_setlen(&path, baselen);
 308        strbuf_addstr(&path, "/info");
 309        safe_create_dir(path.buf, 1);
 310
 311        strbuf_release(&path);
 312}
 313
 314static void separate_git_dir(const char *git_dir, const char *git_link)
 315{
 316        struct stat st;
 317
 318        if (!stat(git_link, &st)) {
 319                const char *src;
 320
 321                if (S_ISREG(st.st_mode))
 322                        src = read_gitfile(git_link);
 323                else if (S_ISDIR(st.st_mode))
 324                        src = git_link;
 325                else
 326                        die(_("unable to handle file type %d"), (int)st.st_mode);
 327
 328                if (rename(src, git_dir))
 329                        die_errno(_("unable to move %s to %s"), src, git_dir);
 330        }
 331
 332        write_file(git_link, "gitdir: %s", git_dir);
 333}
 334
 335int init_db(const char *git_dir, const char *real_git_dir,
 336            const char *template_dir, unsigned int flags)
 337{
 338        int reinit;
 339        int exist_ok = flags & INIT_DB_EXIST_OK;
 340        char *original_git_dir = xstrdup(real_path(git_dir));
 341
 342        if (real_git_dir) {
 343                struct stat st;
 344
 345                if (!exist_ok && !stat(git_dir, &st))
 346                        die(_("%s already exists"), git_dir);
 347
 348                if (!exist_ok && !stat(real_git_dir, &st))
 349                        die(_("%s already exists"), real_git_dir);
 350
 351                set_git_dir(real_path(real_git_dir));
 352                git_dir = get_git_dir();
 353                separate_git_dir(git_dir, original_git_dir);
 354        }
 355        else {
 356                set_git_dir(real_path(git_dir));
 357                git_dir = get_git_dir();
 358        }
 359        startup_info->have_repository = 1;
 360
 361        safe_create_dir(git_dir, 0);
 362
 363        init_is_bare_repository = is_bare_repository();
 364
 365        /* Check to see if the repository version is right.
 366         * Note that a newly created repository does not have
 367         * config file, so this will not fail.  What we are catching
 368         * is an attempt to reinitialize new repository with an old tool.
 369         */
 370        check_repository_format();
 371
 372        reinit = create_default_files(template_dir, original_git_dir);
 373
 374        create_object_directory();
 375
 376        if (get_shared_repository()) {
 377                char buf[10];
 378                /* We do not spell "group" and such, so that
 379                 * the configuration can be read by older version
 380                 * of git. Note, we use octal numbers for new share modes,
 381                 * and compatibility values for PERM_GROUP and
 382                 * PERM_EVERYBODY.
 383                 */
 384                if (get_shared_repository() < 0)
 385                        /* force to the mode value */
 386                        xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
 387                else if (get_shared_repository() == PERM_GROUP)
 388                        xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 389                else if (get_shared_repository() == PERM_EVERYBODY)
 390                        xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 391                else
 392                        die("BUG: invalid value for shared_repository");
 393                git_config_set("core.sharedrepository", buf);
 394                git_config_set("receive.denyNonFastforwards", "true");
 395        }
 396
 397        if (!(flags & INIT_DB_QUIET)) {
 398                int len = strlen(git_dir);
 399
 400                /* TRANSLATORS: The first '%s' is either "Reinitialized
 401                   existing" or "Initialized empty", the second " shared" or
 402                   "", and the last '%s%s' is the verbatim directory name. */
 403                printf(_("%s%s Git repository in %s%s\n"),
 404                       reinit ? _("Reinitialized existing") : _("Initialized empty"),
 405                       get_shared_repository() ? _(" shared") : "",
 406                       git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 407        }
 408
 409        free(original_git_dir);
 410        return 0;
 411}
 412
 413static int guess_repository_type(const char *git_dir)
 414{
 415        const char *slash;
 416        char *cwd;
 417        int cwd_is_git_dir;
 418
 419        /*
 420         * "GIT_DIR=. git init" is always bare.
 421         * "GIT_DIR=`pwd` git init" too.
 422         */
 423        if (!strcmp(".", git_dir))
 424                return 1;
 425        cwd = xgetcwd();
 426        cwd_is_git_dir = !strcmp(git_dir, cwd);
 427        free(cwd);
 428        if (cwd_is_git_dir)
 429                return 1;
 430        /*
 431         * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 432         */
 433        if (!strcmp(git_dir, ".git"))
 434                return 0;
 435        slash = strrchr(git_dir, '/');
 436        if (slash && !strcmp(slash, "/.git"))
 437                return 0;
 438
 439        /*
 440         * Otherwise it is often bare.  At this point
 441         * we are just guessing.
 442         */
 443        return 1;
 444}
 445
 446static int shared_callback(const struct option *opt, const char *arg, int unset)
 447{
 448        *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 449        return 0;
 450}
 451
 452static const char *const init_db_usage[] = {
 453        N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 454        NULL
 455};
 456
 457/*
 458 * If you want to, you can share the DB area with any number of branches.
 459 * That has advantages: you can save space by sharing all the SHA1 objects.
 460 * On the other hand, it might just make lookup slower and messier. You
 461 * be the judge.  The default case is to have one DB per managed directory.
 462 */
 463int cmd_init_db(int argc, const char **argv, const char *prefix)
 464{
 465        const char *git_dir;
 466        const char *real_git_dir = NULL;
 467        const char *work_tree;
 468        const char *template_dir = NULL;
 469        unsigned int flags = 0;
 470        const struct option init_db_options[] = {
 471                OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 472                                N_("directory from which templates will be used")),
 473                OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 474                                N_("create a bare repository"), 1),
 475                { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 476                        N_("permissions"),
 477                        N_("specify that the git repository is to be shared amongst several users"),
 478                        PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 479                OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 480                OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 481                           N_("separate git dir from working tree")),
 482                OPT_END()
 483        };
 484
 485        argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 486
 487        if (real_git_dir && !is_absolute_path(real_git_dir))
 488                real_git_dir = xstrdup(real_path(real_git_dir));
 489
 490        if (argc == 1) {
 491                int mkdir_tried = 0;
 492        retry:
 493                if (chdir(argv[0]) < 0) {
 494                        if (!mkdir_tried) {
 495                                int saved;
 496                                /*
 497                                 * At this point we haven't read any configuration,
 498                                 * and we know shared_repository should always be 0;
 499                                 * but just in case we play safe.
 500                                 */
 501                                saved = get_shared_repository();
 502                                set_shared_repository(0);
 503                                switch (safe_create_leading_directories_const(argv[0])) {
 504                                case SCLD_OK:
 505                                case SCLD_PERMS:
 506                                        break;
 507                                case SCLD_EXISTS:
 508                                        errno = EEXIST;
 509                                        /* fallthru */
 510                                default:
 511                                        die_errno(_("cannot mkdir %s"), argv[0]);
 512                                        break;
 513                                }
 514                                set_shared_repository(saved);
 515                                if (mkdir(argv[0], 0777) < 0)
 516                                        die_errno(_("cannot mkdir %s"), argv[0]);
 517                                mkdir_tried = 1;
 518                                goto retry;
 519                        }
 520                        die_errno(_("cannot chdir to %s"), argv[0]);
 521                }
 522        } else if (0 < argc) {
 523                usage(init_db_usage[0]);
 524        }
 525        if (is_bare_repository_cfg == 1) {
 526                char *cwd = xgetcwd();
 527                setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 528                free(cwd);
 529        }
 530
 531        if (init_shared_repository != -1)
 532                set_shared_repository(init_shared_repository);
 533
 534        /*
 535         * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 536         * without --bare.  Catch the error early.
 537         */
 538        git_dir = getenv(GIT_DIR_ENVIRONMENT);
 539        work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 540        if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 541                die(_("%s (or --work-tree=<directory>) not allowed without "
 542                          "specifying %s (or --git-dir=<directory>)"),
 543                    GIT_WORK_TREE_ENVIRONMENT,
 544                    GIT_DIR_ENVIRONMENT);
 545
 546        /*
 547         * Set up the default .git directory contents
 548         */
 549        if (!git_dir)
 550                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 551
 552        if (is_bare_repository_cfg < 0)
 553                is_bare_repository_cfg = guess_repository_type(git_dir);
 554
 555        if (!is_bare_repository_cfg) {
 556                const char *git_dir_parent = strrchr(git_dir, '/');
 557                if (git_dir_parent) {
 558                        char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 559                        git_work_tree_cfg = xstrdup(real_path(rel));
 560                        free(rel);
 561                }
 562                if (!git_work_tree_cfg)
 563                        git_work_tree_cfg = xgetcwd();
 564                if (work_tree)
 565                        set_git_work_tree(work_tree);
 566                else
 567                        set_git_work_tree(git_work_tree_cfg);
 568                if (access(get_git_work_tree(), X_OK))
 569                        die_errno (_("Cannot access work tree '%s'"),
 570                                   get_git_work_tree());
 571        }
 572        else {
 573                if (work_tree)
 574                        set_git_work_tree(work_tree);
 575        }
 576
 577        flags |= INIT_DB_EXIST_OK;
 578        return init_db(git_dir, real_git_dir, template_dir, flags);
 579}