builtin / init-db.con commit Merge branch 'jc/do-not-feed-tags-to-clear-commit-marks' into maint (93eba05)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7#include "builtin.h"
   8#include "exec_cmd.h"
   9#include "parse-options.h"
  10
  11#ifndef DEFAULT_GIT_TEMPLATE_DIR
  12#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
  13#endif
  14
  15#ifdef NO_TRUSTABLE_FILEMODE
  16#define TEST_FILEMODE 0
  17#else
  18#define TEST_FILEMODE 1
  19#endif
  20
  21static int init_is_bare_repository = 0;
  22static int init_shared_repository = -1;
  23static const char *init_db_template_dir;
  24static const char *git_link;
  25
  26static void safe_create_dir(const char *dir, int share)
  27{
  28        if (mkdir(dir, 0777) < 0) {
  29                if (errno != EEXIST) {
  30                        perror(dir);
  31                        exit(1);
  32                }
  33        }
  34        else if (share && adjust_shared_perm(dir))
  35                die(_("Could not make %s writable by group"), dir);
  36}
  37
  38static void copy_templates_1(char *path, int baselen,
  39                             char *template, int template_baselen,
  40                             DIR *dir)
  41{
  42        struct dirent *de;
  43
  44        /* Note: if ".git/hooks" file exists in the repository being
  45         * re-initialized, /etc/core-git/templates/hooks/update would
  46         * cause "git init" to fail here.  I think this is sane but
  47         * it means that the set of templates we ship by default, along
  48         * with the way the namespace under .git/ is organized, should
  49         * be really carefully chosen.
  50         */
  51        safe_create_dir(path, 1);
  52        while ((de = readdir(dir)) != NULL) {
  53                struct stat st_git, st_template;
  54                int namelen;
  55                int exists = 0;
  56
  57                if (de->d_name[0] == '.')
  58                        continue;
  59                namelen = strlen(de->d_name);
  60                if ((PATH_MAX <= baselen + namelen) ||
  61                    (PATH_MAX <= template_baselen + namelen))
  62                        die(_("insanely long template name %s"), de->d_name);
  63                memcpy(path + baselen, de->d_name, namelen+1);
  64                memcpy(template + template_baselen, de->d_name, namelen+1);
  65                if (lstat(path, &st_git)) {
  66                        if (errno != ENOENT)
  67                                die_errno(_("cannot stat '%s'"), path);
  68                }
  69                else
  70                        exists = 1;
  71
  72                if (lstat(template, &st_template))
  73                        die_errno(_("cannot stat template '%s'"), template);
  74
  75                if (S_ISDIR(st_template.st_mode)) {
  76                        DIR *subdir = opendir(template);
  77                        int baselen_sub = baselen + namelen;
  78                        int template_baselen_sub = template_baselen + namelen;
  79                        if (!subdir)
  80                                die_errno(_("cannot opendir '%s'"), template);
  81                        path[baselen_sub++] =
  82                                template[template_baselen_sub++] = '/';
  83                        path[baselen_sub] =
  84                                template[template_baselen_sub] = 0;
  85                        copy_templates_1(path, baselen_sub,
  86                                         template, template_baselen_sub,
  87                                         subdir);
  88                        closedir(subdir);
  89                }
  90                else if (exists)
  91                        continue;
  92                else if (S_ISLNK(st_template.st_mode)) {
  93                        char lnk[256];
  94                        int len;
  95                        len = readlink(template, lnk, sizeof(lnk));
  96                        if (len < 0)
  97                                die_errno(_("cannot readlink '%s'"), template);
  98                        if (sizeof(lnk) <= len)
  99                                die(_("insanely long symlink %s"), template);
 100                        lnk[len] = 0;
 101                        if (symlink(lnk, path))
 102                                die_errno(_("cannot symlink '%s' '%s'"), lnk, path);
 103                }
 104                else if (S_ISREG(st_template.st_mode)) {
 105                        if (copy_file(path, template, st_template.st_mode))
 106                                die_errno(_("cannot copy '%s' to '%s'"), template,
 107                                          path);
 108                }
 109                else
 110                        error(_("ignoring template %s"), template);
 111        }
 112}
 113
 114static void copy_templates(const char *template_dir)
 115{
 116        char path[PATH_MAX];
 117        char template_path[PATH_MAX];
 118        int template_len;
 119        DIR *dir;
 120        const char *git_dir = get_git_dir();
 121        int len = strlen(git_dir);
 122        char *to_free = NULL;
 123
 124        if (!template_dir)
 125                template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 126        if (!template_dir)
 127                template_dir = init_db_template_dir;
 128        if (!template_dir)
 129                template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 130        if (!template_dir[0]) {
 131                free(to_free);
 132                return;
 133        }
 134        template_len = strlen(template_dir);
 135        if (PATH_MAX <= (template_len+strlen("/config")))
 136                die(_("insanely long template path %s"), template_dir);
 137        strcpy(template_path, template_dir);
 138        if (template_path[template_len-1] != '/') {
 139                template_path[template_len++] = '/';
 140                template_path[template_len] = 0;
 141        }
 142        dir = opendir(template_path);
 143        if (!dir) {
 144                warning(_("templates not found %s"), template_dir);
 145                goto free_return;
 146        }
 147
 148        /* Make sure that template is from the correct vintage */
 149        strcpy(template_path + template_len, "config");
 150        repository_format_version = 0;
 151        git_config_from_file(check_repository_format_version,
 152                             template_path, NULL);
 153        template_path[template_len] = 0;
 154
 155        if (repository_format_version &&
 156            repository_format_version != GIT_REPO_VERSION) {
 157                warning(_("not copying templates of "
 158                        "a wrong format version %d from '%s'"),
 159                        repository_format_version,
 160                        template_dir);
 161                goto close_free_return;
 162        }
 163
 164        memcpy(path, git_dir, len);
 165        if (len && path[len - 1] != '/')
 166                path[len++] = '/';
 167        path[len] = 0;
 168        copy_templates_1(path, len,
 169                         template_path, template_len,
 170                         dir);
 171close_free_return:
 172        closedir(dir);
 173free_return:
 174        free(to_free);
 175}
 176
 177static int git_init_db_config(const char *k, const char *v, void *cb)
 178{
 179        if (!strcmp(k, "init.templatedir"))
 180                return git_config_pathname(&init_db_template_dir, k, v);
 181
 182        return 0;
 183}
 184
 185/*
 186 * If the git_dir is not directly inside the working tree, then git will not
 187 * find it by default, and we need to set the worktree explicitly.
 188 */
 189static int needs_work_tree_config(const char *git_dir, const char *work_tree)
 190{
 191        if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
 192                return 0;
 193        if (skip_prefix(git_dir, work_tree, &git_dir) &&
 194            !strcmp(git_dir, "/.git"))
 195                return 0;
 196        return 1;
 197}
 198
 199static int create_default_files(const char *template_path)
 200{
 201        const char *git_dir = get_git_dir();
 202        unsigned len = strlen(git_dir);
 203        static char path[PATH_MAX];
 204        struct stat st1;
 205        char repo_version_string[10];
 206        char junk[2];
 207        int reinit;
 208        int filemode;
 209
 210        if (len > sizeof(path)-50)
 211                die(_("insane git directory %s"), git_dir);
 212        memcpy(path, git_dir, len);
 213
 214        if (len && path[len-1] != '/')
 215                path[len++] = '/';
 216
 217        /*
 218         * Create .git/refs/{heads,tags}
 219         */
 220        safe_create_dir(git_path("refs"), 1);
 221        safe_create_dir(git_path("refs/heads"), 1);
 222        safe_create_dir(git_path("refs/tags"), 1);
 223
 224        /* Just look for `init.templatedir` */
 225        git_config(git_init_db_config, NULL);
 226
 227        /* First copy the templates -- we might have the default
 228         * config file there, in which case we would want to read
 229         * from it after installing.
 230         */
 231        copy_templates(template_path);
 232
 233        git_config(git_default_config, NULL);
 234        is_bare_repository_cfg = init_is_bare_repository;
 235
 236        /* reading existing config may have overwrote it */
 237        if (init_shared_repository != -1)
 238                shared_repository = init_shared_repository;
 239
 240        /*
 241         * We would have created the above under user's umask -- under
 242         * shared-repository settings, we would need to fix them up.
 243         */
 244        if (shared_repository) {
 245                adjust_shared_perm(get_git_dir());
 246                adjust_shared_perm(git_path("refs"));
 247                adjust_shared_perm(git_path("refs/heads"));
 248                adjust_shared_perm(git_path("refs/tags"));
 249        }
 250
 251        /*
 252         * Create the default symlink from ".git/HEAD" to the "master"
 253         * branch, if it does not exist yet.
 254         */
 255        strcpy(path + len, "HEAD");
 256        reinit = (!access(path, R_OK)
 257                  || readlink(path, junk, sizeof(junk)-1) != -1);
 258        if (!reinit) {
 259                if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 260                        exit(1);
 261        }
 262
 263        /* This forces creation of new config file */
 264        sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 265        git_config_set("core.repositoryformatversion", repo_version_string);
 266
 267        path[len] = 0;
 268        strcpy(path + len, "config");
 269
 270        /* Check filemode trustability */
 271        filemode = TEST_FILEMODE;
 272        if (TEST_FILEMODE && !lstat(path, &st1)) {
 273                struct stat st2;
 274                filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 275                                !lstat(path, &st2) &&
 276                                st1.st_mode != st2.st_mode &&
 277                                !chmod(path, st1.st_mode));
 278                if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 279                        filemode = 0;
 280        }
 281        git_config_set("core.filemode", filemode ? "true" : "false");
 282
 283        if (is_bare_repository())
 284                git_config_set("core.bare", "true");
 285        else {
 286                const char *work_tree = get_git_work_tree();
 287                git_config_set("core.bare", "false");
 288                /* allow template config file to override the default */
 289                if (log_all_ref_updates == -1)
 290                    git_config_set("core.logallrefupdates", "true");
 291                if (needs_work_tree_config(git_dir, work_tree))
 292                        git_config_set("core.worktree", work_tree);
 293        }
 294
 295        if (!reinit) {
 296                /* Check if symlink is supported in the work tree */
 297                path[len] = 0;
 298                strcpy(path + len, "tXXXXXX");
 299                if (!close(xmkstemp(path)) &&
 300                    !unlink(path) &&
 301                    !symlink("testing", path) &&
 302                    !lstat(path, &st1) &&
 303                    S_ISLNK(st1.st_mode))
 304                        unlink(path); /* good */
 305                else
 306                        git_config_set("core.symlinks", "false");
 307
 308                /* Check if the filesystem is case-insensitive */
 309                path[len] = 0;
 310                strcpy(path + len, "CoNfIg");
 311                if (!access(path, F_OK))
 312                        git_config_set("core.ignorecase", "true");
 313                probe_utf8_pathname_composition(path, len);
 314        }
 315
 316        return reinit;
 317}
 318
 319static void create_object_directory(void)
 320{
 321        const char *object_directory = get_object_directory();
 322        int len = strlen(object_directory);
 323        char *path = xmalloc(len + 40);
 324
 325        memcpy(path, object_directory, len);
 326
 327        safe_create_dir(object_directory, 1);
 328        strcpy(path+len, "/pack");
 329        safe_create_dir(path, 1);
 330        strcpy(path+len, "/info");
 331        safe_create_dir(path, 1);
 332
 333        free(path);
 334}
 335
 336int set_git_dir_init(const char *git_dir, const char *real_git_dir,
 337                     int exist_ok)
 338{
 339        if (real_git_dir) {
 340                struct stat st;
 341
 342                if (!exist_ok && !stat(git_dir, &st))
 343                        die(_("%s already exists"), git_dir);
 344
 345                if (!exist_ok && !stat(real_git_dir, &st))
 346                        die(_("%s already exists"), real_git_dir);
 347
 348                /*
 349                 * make sure symlinks are resolved because we'll be
 350                 * moving the target repo later on in separate_git_dir()
 351                 */
 352                git_link = xstrdup(real_path(git_dir));
 353                set_git_dir(real_path(real_git_dir));
 354        }
 355        else {
 356                set_git_dir(real_path(git_dir));
 357                git_link = NULL;
 358        }
 359        return 0;
 360}
 361
 362static void separate_git_dir(const char *git_dir)
 363{
 364        struct stat st;
 365        FILE *fp;
 366
 367        if (!stat(git_link, &st)) {
 368                const char *src;
 369
 370                if (S_ISREG(st.st_mode))
 371                        src = read_gitfile(git_link);
 372                else if (S_ISDIR(st.st_mode))
 373                        src = git_link;
 374                else
 375                        die(_("unable to handle file type %d"), (int)st.st_mode);
 376
 377                if (rename(src, git_dir))
 378                        die_errno(_("unable to move %s to %s"), src, git_dir);
 379        }
 380
 381        fp = fopen(git_link, "w");
 382        if (!fp)
 383                die(_("Could not create git link %s"), git_link);
 384        fprintf(fp, "gitdir: %s\n", git_dir);
 385        fclose(fp);
 386}
 387
 388int init_db(const char *template_dir, unsigned int flags)
 389{
 390        int reinit;
 391        const char *git_dir = get_git_dir();
 392
 393        if (git_link)
 394                separate_git_dir(git_dir);
 395
 396        safe_create_dir(git_dir, 0);
 397
 398        init_is_bare_repository = is_bare_repository();
 399
 400        /* Check to see if the repository version is right.
 401         * Note that a newly created repository does not have
 402         * config file, so this will not fail.  What we are catching
 403         * is an attempt to reinitialize new repository with an old tool.
 404         */
 405        check_repository_format();
 406
 407        reinit = create_default_files(template_dir);
 408
 409        create_object_directory();
 410
 411        if (shared_repository) {
 412                char buf[10];
 413                /* We do not spell "group" and such, so that
 414                 * the configuration can be read by older version
 415                 * of git. Note, we use octal numbers for new share modes,
 416                 * and compatibility values for PERM_GROUP and
 417                 * PERM_EVERYBODY.
 418                 */
 419                if (shared_repository < 0)
 420                        /* force to the mode value */
 421                        sprintf(buf, "0%o", -shared_repository);
 422                else if (shared_repository == PERM_GROUP)
 423                        sprintf(buf, "%d", OLD_PERM_GROUP);
 424                else if (shared_repository == PERM_EVERYBODY)
 425                        sprintf(buf, "%d", OLD_PERM_EVERYBODY);
 426                else
 427                        die("oops");
 428                git_config_set("core.sharedrepository", buf);
 429                git_config_set("receive.denyNonFastforwards", "true");
 430        }
 431
 432        if (!(flags & INIT_DB_QUIET)) {
 433                int len = strlen(git_dir);
 434
 435                /* TRANSLATORS: The first '%s' is either "Reinitialized
 436                   existing" or "Initialized empty", the second " shared" or
 437                   "", and the last '%s%s' is the verbatim directory name. */
 438                printf(_("%s%s Git repository in %s%s\n"),
 439                       reinit ? _("Reinitialized existing") : _("Initialized empty"),
 440                       shared_repository ? _(" shared") : "",
 441                       git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 442        }
 443
 444        return 0;
 445}
 446
 447static int guess_repository_type(const char *git_dir)
 448{
 449        const char *slash;
 450        char *cwd;
 451        int cwd_is_git_dir;
 452
 453        /*
 454         * "GIT_DIR=. git init" is always bare.
 455         * "GIT_DIR=`pwd` git init" too.
 456         */
 457        if (!strcmp(".", git_dir))
 458                return 1;
 459        cwd = xgetcwd();
 460        cwd_is_git_dir = !strcmp(git_dir, cwd);
 461        free(cwd);
 462        if (cwd_is_git_dir)
 463                return 1;
 464        /*
 465         * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 466         */
 467        if (!strcmp(git_dir, ".git"))
 468                return 0;
 469        slash = strrchr(git_dir, '/');
 470        if (slash && !strcmp(slash, "/.git"))
 471                return 0;
 472
 473        /*
 474         * Otherwise it is often bare.  At this point
 475         * we are just guessing.
 476         */
 477        return 1;
 478}
 479
 480static int shared_callback(const struct option *opt, const char *arg, int unset)
 481{
 482        *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 483        return 0;
 484}
 485
 486static const char *const init_db_usage[] = {
 487        N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 488        NULL
 489};
 490
 491/*
 492 * If you want to, you can share the DB area with any number of branches.
 493 * That has advantages: you can save space by sharing all the SHA1 objects.
 494 * On the other hand, it might just make lookup slower and messier. You
 495 * be the judge.  The default case is to have one DB per managed directory.
 496 */
 497int cmd_init_db(int argc, const char **argv, const char *prefix)
 498{
 499        const char *git_dir;
 500        const char *real_git_dir = NULL;
 501        const char *work_tree;
 502        const char *template_dir = NULL;
 503        unsigned int flags = 0;
 504        const struct option init_db_options[] = {
 505                OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 506                                N_("directory from which templates will be used")),
 507                OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 508                                N_("create a bare repository"), 1),
 509                { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 510                        N_("permissions"),
 511                        N_("specify that the git repository is to be shared amongst several users"),
 512                        PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 513                OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 514                OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 515                           N_("separate git dir from working tree")),
 516                OPT_END()
 517        };
 518
 519        argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 520
 521        if (real_git_dir && !is_absolute_path(real_git_dir))
 522                real_git_dir = xstrdup(real_path(real_git_dir));
 523
 524        if (argc == 1) {
 525                int mkdir_tried = 0;
 526        retry:
 527                if (chdir(argv[0]) < 0) {
 528                        if (!mkdir_tried) {
 529                                int saved;
 530                                /*
 531                                 * At this point we haven't read any configuration,
 532                                 * and we know shared_repository should always be 0;
 533                                 * but just in case we play safe.
 534                                 */
 535                                saved = shared_repository;
 536                                shared_repository = 0;
 537                                switch (safe_create_leading_directories_const(argv[0])) {
 538                                case SCLD_OK:
 539                                case SCLD_PERMS:
 540                                        break;
 541                                case SCLD_EXISTS:
 542                                        errno = EEXIST;
 543                                        /* fallthru */
 544                                default:
 545                                        die_errno(_("cannot mkdir %s"), argv[0]);
 546                                        break;
 547                                }
 548                                shared_repository = saved;
 549                                if (mkdir(argv[0], 0777) < 0)
 550                                        die_errno(_("cannot mkdir %s"), argv[0]);
 551                                mkdir_tried = 1;
 552                                goto retry;
 553                        }
 554                        die_errno(_("cannot chdir to %s"), argv[0]);
 555                }
 556        } else if (0 < argc) {
 557                usage(init_db_usage[0]);
 558        }
 559        if (is_bare_repository_cfg == 1) {
 560                char *cwd = xgetcwd();
 561                setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 562                free(cwd);
 563        }
 564
 565        if (init_shared_repository != -1)
 566                shared_repository = init_shared_repository;
 567
 568        /*
 569         * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 570         * without --bare.  Catch the error early.
 571         */
 572        git_dir = getenv(GIT_DIR_ENVIRONMENT);
 573        work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 574        if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 575                die(_("%s (or --work-tree=<directory>) not allowed without "
 576                          "specifying %s (or --git-dir=<directory>)"),
 577                    GIT_WORK_TREE_ENVIRONMENT,
 578                    GIT_DIR_ENVIRONMENT);
 579
 580        /*
 581         * Set up the default .git directory contents
 582         */
 583        if (!git_dir)
 584                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 585
 586        if (is_bare_repository_cfg < 0)
 587                is_bare_repository_cfg = guess_repository_type(git_dir);
 588
 589        if (!is_bare_repository_cfg) {
 590                const char *git_dir_parent = strrchr(git_dir, '/');
 591                if (git_dir_parent) {
 592                        char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 593                        git_work_tree_cfg = xstrdup(real_path(rel));
 594                        free(rel);
 595                }
 596                if (!git_work_tree_cfg)
 597                        git_work_tree_cfg = xgetcwd();
 598                if (work_tree)
 599                        set_git_work_tree(work_tree);
 600                else
 601                        set_git_work_tree(git_work_tree_cfg);
 602                if (access(get_git_work_tree(), X_OK))
 603                        die_errno (_("Cannot access work tree '%s'"),
 604                                   get_git_work_tree());
 605        }
 606        else {
 607                if (work_tree)
 608                        set_git_work_tree(work_tree);
 609        }
 610
 611        set_git_dir_init(git_dir, real_git_dir, 1);
 612
 613        return init_db(template_dir, flags);
 614}