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 safe_create_dir(const char *dir, int share)
  28{
  29        if (mkdir(dir, 0777) < 0) {
  30                if (errno != EEXIST) {
  31                        perror(dir);
  32                        exit(1);
  33                }
  34        }
  35        else if (share && adjust_shared_perm(dir))
  36                die(_("Could not make %s writable by group"), dir);
  37}
  38
  39static void copy_templates_1(struct strbuf *path, struct strbuf *template,
  40                             DIR *dir)
  41{
  42        size_t path_baselen = path->len;
  43        size_t template_baselen = template->len;
  44        struct dirent *de;
  45
  46        /* Note: if ".git/hooks" file exists in the repository being
  47         * re-initialized, /etc/core-git/templates/hooks/update would
  48         * cause "git init" to fail here.  I think this is sane but
  49         * it means that the set of templates we ship by default, along
  50         * with the way the namespace under .git/ is organized, should
  51         * be really carefully chosen.
  52         */
  53        safe_create_dir(path->buf, 1);
  54        while ((de = readdir(dir)) != NULL) {
  55                struct stat st_git, st_template;
  56                int exists = 0;
  57
  58                strbuf_setlen(path, path_baselen);
  59                strbuf_setlen(template, template_baselen);
  60
  61                if (de->d_name[0] == '.')
  62                        continue;
  63                strbuf_addstr(path, de->d_name);
  64                strbuf_addstr(template, de->d_name);
  65                if (lstat(path->buf, &st_git)) {
  66                        if (errno != ENOENT)
  67                                die_errno(_("cannot stat '%s'"), path->buf);
  68                }
  69                else
  70                        exists = 1;
  71
  72                if (lstat(template->buf, &st_template))
  73                        die_errno(_("cannot stat template '%s'"), template->buf);
  74
  75                if (S_ISDIR(st_template.st_mode)) {
  76                        DIR *subdir = opendir(template->buf);
  77                        if (!subdir)
  78                                die_errno(_("cannot opendir '%s'"), template->buf);
  79                        strbuf_addch(path, '/');
  80                        strbuf_addch(template, '/');
  81                        copy_templates_1(path, template, subdir);
  82                        closedir(subdir);
  83                }
  84                else if (exists)
  85                        continue;
  86                else if (S_ISLNK(st_template.st_mode)) {
  87                        struct strbuf lnk = STRBUF_INIT;
  88                        if (strbuf_readlink(&lnk, template->buf, 0) < 0)
  89                                die_errno(_("cannot readlink '%s'"), template->buf);
  90                        if (symlink(lnk.buf, path->buf))
  91                                die_errno(_("cannot symlink '%s' '%s'"),
  92                                          lnk.buf, path->buf);
  93                        strbuf_release(&lnk);
  94                }
  95                else if (S_ISREG(st_template.st_mode)) {
  96                        if (copy_file(path->buf, template->buf, st_template.st_mode))
  97                                die_errno(_("cannot copy '%s' to '%s'"),
  98                                          template->buf, path->buf);
  99                }
 100                else
 101                        error(_("ignoring template %s"), template->buf);
 102        }
 103}
 104
 105static void copy_templates(const char *template_dir)
 106{
 107        struct strbuf path = STRBUF_INIT;
 108        struct strbuf template_path = STRBUF_INIT;
 109        size_t template_len;
 110        DIR *dir;
 111        char *to_free = NULL;
 112
 113        if (!template_dir)
 114                template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 115        if (!template_dir)
 116                template_dir = init_db_template_dir;
 117        if (!template_dir)
 118                template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 119        if (!template_dir[0]) {
 120                free(to_free);
 121                return;
 122        }
 123
 124        strbuf_addstr(&template_path, template_dir);
 125        strbuf_complete(&template_path, '/');
 126        template_len = template_path.len;
 127
 128        dir = opendir(template_path.buf);
 129        if (!dir) {
 130                warning(_("templates not found %s"), template_dir);
 131                goto free_return;
 132        }
 133
 134        /* Make sure that template is from the correct vintage */
 135        strbuf_addstr(&template_path, "config");
 136        repository_format_version = 0;
 137        git_config_from_file(check_repository_format_version,
 138                             template_path.buf, NULL);
 139        strbuf_setlen(&template_path, template_len);
 140
 141        if (repository_format_version &&
 142            repository_format_version != GIT_REPO_VERSION) {
 143                warning(_("not copying templates of "
 144                        "a wrong format version %d from '%s'"),
 145                        repository_format_version,
 146                        template_dir);
 147                goto close_free_return;
 148        }
 149
 150        strbuf_addstr(&path, get_git_dir());
 151        strbuf_complete(&path, '/');
 152        copy_templates_1(&path, &template_path, dir);
 153close_free_return:
 154        closedir(dir);
 155free_return:
 156        free(to_free);
 157        strbuf_release(&path);
 158        strbuf_release(&template_path);
 159}
 160
 161static int git_init_db_config(const char *k, const char *v, void *cb)
 162{
 163        if (!strcmp(k, "init.templatedir"))
 164                return git_config_pathname(&init_db_template_dir, k, v);
 165
 166        return 0;
 167}
 168
 169/*
 170 * If the git_dir is not directly inside the working tree, then git will not
 171 * find it by default, and we need to set the worktree explicitly.
 172 */
 173static int needs_work_tree_config(const char *git_dir, const char *work_tree)
 174{
 175        if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
 176                return 0;
 177        if (skip_prefix(git_dir, work_tree, &git_dir) &&
 178            !strcmp(git_dir, "/.git"))
 179                return 0;
 180        return 1;
 181}
 182
 183static int create_default_files(const char *template_path)
 184{
 185        struct stat st1;
 186        struct strbuf buf = STRBUF_INIT;
 187        char *path;
 188        char repo_version_string[10];
 189        char junk[2];
 190        int reinit;
 191        int filemode;
 192
 193        /*
 194         * Create .git/refs/{heads,tags}
 195         */
 196        safe_create_dir(git_path_buf(&buf, "refs"), 1);
 197        safe_create_dir(git_path_buf(&buf, "refs/heads"), 1);
 198        safe_create_dir(git_path_buf(&buf, "refs/tags"), 1);
 199
 200        /* Just look for `init.templatedir` */
 201        git_config(git_init_db_config, NULL);
 202
 203        /* First copy the templates -- we might have the default
 204         * config file there, in which case we would want to read
 205         * from it after installing.
 206         */
 207        copy_templates(template_path);
 208
 209        git_config(git_default_config, NULL);
 210        is_bare_repository_cfg = init_is_bare_repository;
 211
 212        /* reading existing config may have overwrote it */
 213        if (init_shared_repository != -1)
 214                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 (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(get_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
 314int set_git_dir_init(const char *git_dir, const char *real_git_dir,
 315                     int exist_ok)
 316{
 317        if (real_git_dir) {
 318                struct stat st;
 319
 320                if (!exist_ok && !stat(git_dir, &st))
 321                        die(_("%s already exists"), git_dir);
 322
 323                if (!exist_ok && !stat(real_git_dir, &st))
 324                        die(_("%s already exists"), real_git_dir);
 325
 326                /*
 327                 * make sure symlinks are resolved because we'll be
 328                 * moving the target repo later on in separate_git_dir()
 329                 */
 330                git_link = xstrdup(real_path(git_dir));
 331                set_git_dir(real_path(real_git_dir));
 332        }
 333        else {
 334                set_git_dir(real_path(git_dir));
 335                git_link = NULL;
 336        }
 337        return 0;
 338}
 339
 340static void separate_git_dir(const char *git_dir)
 341{
 342        struct stat st;
 343
 344        if (!stat(git_link, &st)) {
 345                const char *src;
 346
 347                if (S_ISREG(st.st_mode))
 348                        src = read_gitfile(git_link);
 349                else if (S_ISDIR(st.st_mode))
 350                        src = git_link;
 351                else
 352                        die(_("unable to handle file type %d"), (int)st.st_mode);
 353
 354                if (rename(src, git_dir))
 355                        die_errno(_("unable to move %s to %s"), src, git_dir);
 356        }
 357
 358        write_file(git_link, "gitdir: %s", git_dir);
 359}
 360
 361int init_db(const char *template_dir, unsigned int flags)
 362{
 363        int reinit;
 364        const char *git_dir = get_git_dir();
 365
 366        if (git_link)
 367                separate_git_dir(git_dir);
 368
 369        safe_create_dir(git_dir, 0);
 370
 371        init_is_bare_repository = is_bare_repository();
 372
 373        /* Check to see if the repository version is right.
 374         * Note that a newly created repository does not have
 375         * config file, so this will not fail.  What we are catching
 376         * is an attempt to reinitialize new repository with an old tool.
 377         */
 378        check_repository_format();
 379
 380        reinit = create_default_files(template_dir);
 381
 382        create_object_directory();
 383
 384        if (shared_repository) {
 385                char buf[10];
 386                /* We do not spell "group" and such, so that
 387                 * the configuration can be read by older version
 388                 * of git. Note, we use octal numbers for new share modes,
 389                 * and compatibility values for PERM_GROUP and
 390                 * PERM_EVERYBODY.
 391                 */
 392                if (shared_repository < 0)
 393                        /* force to the mode value */
 394                        xsnprintf(buf, sizeof(buf), "0%o", -shared_repository);
 395                else if (shared_repository == PERM_GROUP)
 396                        xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 397                else if (shared_repository == PERM_EVERYBODY)
 398                        xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 399                else
 400                        die("BUG: invalid value for shared_repository");
 401                git_config_set("core.sharedrepository", buf);
 402                git_config_set("receive.denyNonFastforwards", "true");
 403        }
 404
 405        if (!(flags & INIT_DB_QUIET)) {
 406                int len = strlen(git_dir);
 407
 408                /* TRANSLATORS: The first '%s' is either "Reinitialized
 409                   existing" or "Initialized empty", the second " shared" or
 410                   "", and the last '%s%s' is the verbatim directory name. */
 411                printf(_("%s%s Git repository in %s%s\n"),
 412                       reinit ? _("Reinitialized existing") : _("Initialized empty"),
 413                       shared_repository ? _(" shared") : "",
 414                       git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 415        }
 416
 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        *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 456        return 0;
 457}
 458
 459static const char *const init_db_usage[] = {
 460        N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 461        NULL
 462};
 463
 464/*
 465 * If you want to, you can share the DB area with any number of branches.
 466 * That has advantages: you can save space by sharing all the SHA1 objects.
 467 * On the other hand, it might just make lookup slower and messier. You
 468 * be the judge.  The default case is to have one DB per managed directory.
 469 */
 470int cmd_init_db(int argc, const char **argv, const char *prefix)
 471{
 472        const char *git_dir;
 473        const char *real_git_dir = NULL;
 474        const char *work_tree;
 475        const char *template_dir = NULL;
 476        unsigned int flags = 0;
 477        const struct option init_db_options[] = {
 478                OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 479                                N_("directory from which templates will be used")),
 480                OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 481                                N_("create a bare repository"), 1),
 482                { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 483                        N_("permissions"),
 484                        N_("specify that the git repository is to be shared amongst several users"),
 485                        PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 486                OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 487                OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 488                           N_("separate git dir from working tree")),
 489                OPT_END()
 490        };
 491
 492        argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 493
 494        if (real_git_dir && !is_absolute_path(real_git_dir))
 495                real_git_dir = xstrdup(real_path(real_git_dir));
 496
 497        if (argc == 1) {
 498                int mkdir_tried = 0;
 499        retry:
 500                if (chdir(argv[0]) < 0) {
 501                        if (!mkdir_tried) {
 502                                int saved;
 503                                /*
 504                                 * At this point we haven't read any configuration,
 505                                 * and we know shared_repository should always be 0;
 506                                 * but just in case we play safe.
 507                                 */
 508                                saved = shared_repository;
 509                                shared_repository = 0;
 510                                switch (safe_create_leading_directories_const(argv[0])) {
 511                                case SCLD_OK:
 512                                case SCLD_PERMS:
 513                                        break;
 514                                case SCLD_EXISTS:
 515                                        errno = EEXIST;
 516                                        /* fallthru */
 517                                default:
 518                                        die_errno(_("cannot mkdir %s"), argv[0]);
 519                                        break;
 520                                }
 521                                shared_repository = saved;
 522                                if (mkdir(argv[0], 0777) < 0)
 523                                        die_errno(_("cannot mkdir %s"), argv[0]);
 524                                mkdir_tried = 1;
 525                                goto retry;
 526                        }
 527                        die_errno(_("cannot chdir to %s"), argv[0]);
 528                }
 529        } else if (0 < argc) {
 530                usage(init_db_usage[0]);
 531        }
 532        if (is_bare_repository_cfg == 1) {
 533                char *cwd = xgetcwd();
 534                setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 535                free(cwd);
 536        }
 537
 538        if (init_shared_repository != -1)
 539                shared_repository = init_shared_repository;
 540
 541        /*
 542         * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 543         * without --bare.  Catch the error early.
 544         */
 545        git_dir = getenv(GIT_DIR_ENVIRONMENT);
 546        work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 547        if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 548                die(_("%s (or --work-tree=<directory>) not allowed without "
 549                          "specifying %s (or --git-dir=<directory>)"),
 550                    GIT_WORK_TREE_ENVIRONMENT,
 551                    GIT_DIR_ENVIRONMENT);
 552
 553        /*
 554         * Set up the default .git directory contents
 555         */
 556        if (!git_dir)
 557                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 558
 559        if (is_bare_repository_cfg < 0)
 560                is_bare_repository_cfg = guess_repository_type(git_dir);
 561
 562        if (!is_bare_repository_cfg) {
 563                const char *git_dir_parent = strrchr(git_dir, '/');
 564                if (git_dir_parent) {
 565                        char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 566                        git_work_tree_cfg = xstrdup(real_path(rel));
 567                        free(rel);
 568                }
 569                if (!git_work_tree_cfg)
 570                        git_work_tree_cfg = xgetcwd();
 571                if (work_tree)
 572                        set_git_work_tree(work_tree);
 573                else
 574                        set_git_work_tree(git_work_tree_cfg);
 575                if (access(get_git_work_tree(), X_OK))
 576                        die_errno (_("Cannot access work tree '%s'"),
 577                                   get_git_work_tree());
 578        }
 579        else {
 580                if (work_tree)
 581                        set_git_work_tree(work_tree);
 582        }
 583
 584        set_git_dir_init(git_dir, real_git_dir, 1);
 585
 586        return init_db(template_dir, flags);
 587}