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