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