builtin/init-db.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "config.h"
   8 #include "refs.h"
   9 #include "builtin.h"
  10 #include "exec_cmd.h"
  11 #include "parse-options.h"
  12
  13 #ifndef DEFAULT_GIT_TEMPLATE_DIR
  14 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
  15 #endif
  16
  17 #ifdef NO_TRUSTABLE_FILEMODE
  18 #define TEST_FILEMODE 0
  19 #else
  20 #define TEST_FILEMODE 1
  21 #endif
  22
  23 static int init_is_bare_repository = 0;
  24 static int init_shared_repository = -1;
  25 static const char *init_db_template_dir;
  26
  27 static 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
  93 static 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_common_dir());
 142         strbuf_complete(&path, '/');
 143         copy_templates_1(&path, &template_path, dir);
 144 close_free_return:
 145         closedir(dir);
 146 free_return:
 147         free(to_free);
 148         strbuf_release(&path);
 149         strbuf_release(&template_path);
 150 }
 151
 152 static 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  */
 164 static 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
 174 static int create_default_files(const char *template_path,
 175                                 const char *original_git_dir)
 176 {
 177         struct stat st1;
 178         struct strbuf buf = STRBUF_INIT;
 179         char *path;
 180         char repo_version_string[10];
 181         char junk[2];
 182         int reinit;
 183         int filemode;
 184         struct strbuf err = STRBUF_INIT;
 185
 186         /* Just look for `init.templatedir` */
 187         git_config(git_init_db_config, NULL);
 188
 189         /*
 190          * First copy the templates -- we might have the default
 191          * config file there, in which case we would want to read
 192          * from it after installing.
 193          *
 194          * Before reading that config, we also need to clear out any cached
 195          * values (since we've just potentially changed what's available on
 196          * disk).
 197          */
 198         copy_templates(template_path);
 199         git_config_clear();
 200         reset_shared_repository();
 201         git_config(git_default_config, NULL);
 202
 203         /*
 204          * We must make sure command-line options continue to override any
 205          * values we might have just re-read from the config.
 206          */
 207         is_bare_repository_cfg = init_is_bare_repository;
 208         if (init_shared_repository != -1)
 209                 set_shared_repository(init_shared_repository);
 210
 211         /*
 212          * We would have created the above under user's umask -- under
 213          * shared-repository settings, we would need to fix them up.
 214          */
 215         if (get_shared_repository()) {
 216                 adjust_shared_perm(get_git_dir());
 217         }
 218
 219         /*
 220          * We need to create a "refs" dir in any case so that older
 221          * versions of git can tell that this is a repository.
 222          */
 223         safe_create_dir(git_path("refs"), 1);
 224         adjust_shared_perm(git_path("refs"));
 225
 226         if (refs_init_db(&err))
 227                 die("failed to set up refs db: %s", err.buf);
 228
 229         /*
 230          * Create the default symlink from ".git/HEAD" to the "master"
 231          * branch, if it does not exist yet.
 232          */
 233         path = git_path_buf(&buf, "HEAD");
 234         reinit = (!access(path, R_OK)
 235                   || readlink(path, junk, sizeof(junk)-1) != -1);
 236         if (!reinit) {
 237                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 238                         exit(1);
 239         }
 240
 241         /* This forces creation of new config file */
 242         xsnprintf(repo_version_string, sizeof(repo_version_string),
 243                   "%d", GIT_REPO_VERSION);
 244         git_config_set("core.repositoryformatversion", repo_version_string);
 245
 246         /* Check filemode trustability */
 247         path = git_path_buf(&buf, "config");
 248         filemode = TEST_FILEMODE;
 249         if (TEST_FILEMODE && !lstat(path, &st1)) {
 250                 struct stat st2;
 251                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 252                                 !lstat(path, &st2) &&
 253                                 st1.st_mode != st2.st_mode &&
 254                                 !chmod(path, st1.st_mode));
 255                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 256                         filemode = 0;
 257         }
 258         git_config_set("core.filemode", filemode ? "true" : "false");
 259
 260         if (is_bare_repository())
 261                 git_config_set("core.bare", "true");
 262         else {
 263                 const char *work_tree = get_git_work_tree();
 264                 git_config_set("core.bare", "false");
 265                 /* allow template config file to override the default */
 266                 if (log_all_ref_updates == LOG_REFS_UNSET)
 267                         git_config_set("core.logallrefupdates", "true");
 268                 if (needs_work_tree_config(original_git_dir, work_tree))
 269                         git_config_set("core.worktree", work_tree);
 270         }
 271
 272         if (!reinit) {
 273                 /* Check if symlink is supported in the work tree */
 274                 path = git_path_buf(&buf, "tXXXXXX");
 275                 if (!close(xmkstemp(path)) &&
 276                     !unlink(path) &&
 277                     !symlink("testing", path) &&
 278                     !lstat(path, &st1) &&
 279                     S_ISLNK(st1.st_mode))
 280                         unlink(path); /* good */
 281                 else
 282                         git_config_set("core.symlinks", "false");
 283
 284                 /* Check if the filesystem is case-insensitive */
 285                 path = git_path_buf(&buf, "CoNfIg");
 286                 if (!access(path, F_OK))
 287                         git_config_set("core.ignorecase", "true");
 288                 probe_utf8_pathname_composition();
 289         }
 290
 291         strbuf_release(&buf);
 292         return reinit;
 293 }
 294
 295 static void create_object_directory(void)
 296 {
 297         struct strbuf path = STRBUF_INIT;
 298         size_t baselen;
 299
 300         strbuf_addstr(&path, get_object_directory());
 301         baselen = path.len;
 302
 303         safe_create_dir(path.buf, 1);
 304
 305         strbuf_setlen(&path, baselen);
 306         strbuf_addstr(&path, "/pack");
 307         safe_create_dir(path.buf, 1);
 308
 309         strbuf_setlen(&path, baselen);
 310         strbuf_addstr(&path, "/info");
 311         safe_create_dir(path.buf, 1);
 312
 313         strbuf_release(&path);
 314 }
 315
 316 static void separate_git_dir(const char *git_dir, const char *git_link)
 317 {
 318         struct stat st;
 319
 320         if (!stat(git_link, &st)) {
 321                 const char *src;
 322
 323                 if (S_ISREG(st.st_mode))
 324                         src = read_gitfile(git_link);
 325                 else if (S_ISDIR(st.st_mode))
 326                         src = git_link;
 327                 else
 328                         die(_("unable to handle file type %d"), (int)st.st_mode);
 329
 330                 if (rename(src, git_dir))
 331                         die_errno(_("unable to move %s to %s"), src, git_dir);
 332         }
 333
 334         write_file(git_link, "gitdir: %s", git_dir);
 335 }
 336
 337 int init_db(const char *git_dir, const char *real_git_dir,
 338             const char *template_dir, unsigned int flags)
 339 {
 340         int reinit;
 341         int exist_ok = flags & INIT_DB_EXIST_OK;
 342         char *original_git_dir = real_pathdup(git_dir, 1);
 343
 344         if (real_git_dir) {
 345                 struct stat st;
 346
 347                 if (!exist_ok && !stat(git_dir, &st))
 348                         die(_("%s already exists"), git_dir);
 349
 350                 if (!exist_ok && !stat(real_git_dir, &st))
 351                         die(_("%s already exists"), real_git_dir);
 352
 353                 set_git_dir(real_path(real_git_dir));
 354                 git_dir = get_git_dir();
 355                 separate_git_dir(git_dir, original_git_dir);
 356         }
 357         else {
 358                 set_git_dir(real_path(git_dir));
 359                 git_dir = get_git_dir();
 360         }
 361         startup_info->have_repository = 1;
 362
 363         safe_create_dir(git_dir, 0);
 364
 365         init_is_bare_repository = is_bare_repository();
 366
 367         /* Check to see if the repository version is right.
 368          * Note that a newly created repository does not have
 369          * config file, so this will not fail.  What we are catching
 370          * is an attempt to reinitialize new repository with an old tool.
 371          */
 372         check_repository_format();
 373
 374         reinit = create_default_files(template_dir, original_git_dir);
 375
 376         create_object_directory();
 377
 378         if (get_shared_repository()) {
 379                 char buf[10];
 380                 /* We do not spell "group" and such, so that
 381                  * the configuration can be read by older version
 382                  * of git. Note, we use octal numbers for new share modes,
 383                  * and compatibility values for PERM_GROUP and
 384                  * PERM_EVERYBODY.
 385                  */
 386                 if (get_shared_repository() < 0)
 387                         /* force to the mode value */
 388                         xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
 389                 else if (get_shared_repository() == PERM_GROUP)
 390                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 391                 else if (get_shared_repository() == PERM_EVERYBODY)
 392                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 393                 else
 394                         die("BUG: invalid value for shared_repository");
 395                 git_config_set("core.sharedrepository", buf);
 396                 git_config_set("receive.denyNonFastforwards", "true");
 397         }
 398
 399         if (!(flags & INIT_DB_QUIET)) {
 400                 int len = strlen(git_dir);
 401
 402                 if (reinit)
 403                         printf(get_shared_repository()
 404                                ? _("Reinitialized existing shared Git repository in %s%s\n")
 405                                : _("Reinitialized existing Git repository in %s%s\n"),
 406                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 407                 else
 408                         printf(get_shared_repository()
 409                                ? _("Initialized empty shared Git repository in %s%s\n")
 410                                : _("Initialized empty Git repository in %s%s\n"),
 411                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 412         }
 413
 414         free(original_git_dir);
 415         return 0;
 416 }
 417
 418 static int guess_repository_type(const char *git_dir)
 419 {
 420         const char *slash;
 421         char *cwd;
 422         int cwd_is_git_dir;
 423
 424         /*
 425          * "GIT_DIR=. git init" is always bare.
 426          * "GIT_DIR=`pwd` git init" too.
 427          */
 428         if (!strcmp(".", git_dir))
 429                 return 1;
 430         cwd = xgetcwd();
 431         cwd_is_git_dir = !strcmp(git_dir, cwd);
 432         free(cwd);
 433         if (cwd_is_git_dir)
 434                 return 1;
 435         /*
 436          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 437          */
 438         if (!strcmp(git_dir, ".git"))
 439                 return 0;
 440         slash = strrchr(git_dir, '/');
 441         if (slash && !strcmp(slash, "/.git"))
 442                 return 0;
 443
 444         /*
 445          * Otherwise it is often bare.  At this point
 446          * we are just guessing.
 447          */
 448         return 1;
 449 }
 450
 451 static int shared_callback(const struct option *opt, const char *arg, int unset)
 452 {
 453         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 454         return 0;
 455 }
 456
 457 static const char *const init_db_usage[] = {
 458         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 459         NULL
 460 };
 461
 462 /*
 463  * If you want to, you can share the DB area with any number of branches.
 464  * That has advantages: you can save space by sharing all the SHA1 objects.
 465  * On the other hand, it might just make lookup slower and messier. You
 466  * be the judge.  The default case is to have one DB per managed directory.
 467  */
 468 int cmd_init_db(int argc, const char **argv, const char *prefix)
 469 {
 470         const char *git_dir;
 471         const char *real_git_dir = NULL;
 472         const char *work_tree;
 473         const char *template_dir = NULL;
 474         unsigned int flags = 0;
 475         const struct option init_db_options[] = {
 476                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 477                                 N_("directory from which templates will be used")),
 478                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 479                                 N_("create a bare repository"), 1),
 480                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 481                         N_("permissions"),
 482                         N_("specify that the git repository is to be shared amongst several users"),
 483                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 484                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 485                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 486                            N_("separate git dir from working tree")),
 487                 OPT_END()
 488         };
 489
 490         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 491
 492         if (real_git_dir && !is_absolute_path(real_git_dir))
 493                 real_git_dir = real_pathdup(real_git_dir, 1);
 494
 495         if (argc == 1) {
 496                 int mkdir_tried = 0;
 497         retry:
 498                 if (chdir(argv[0]) < 0) {
 499                         if (!mkdir_tried) {
 500                                 int saved;
 501                                 /*
 502                                  * At this point we haven't read any configuration,
 503                                  * and we know shared_repository should always be 0;
 504                                  * but just in case we play safe.
 505                                  */
 506                                 saved = get_shared_repository();
 507                                 set_shared_repository(0);
 508                                 switch (safe_create_leading_directories_const(argv[0])) {
 509                                 case SCLD_OK:
 510                                 case SCLD_PERMS:
 511                                         break;
 512                                 case SCLD_EXISTS:
 513                                         errno = EEXIST;
 514                                         /* fallthru */
 515                                 default:
 516                                         die_errno(_("cannot mkdir %s"), argv[0]);
 517                                         break;
 518                                 }
 519                                 set_shared_repository(saved);
 520                                 if (mkdir(argv[0], 0777) < 0)
 521                                         die_errno(_("cannot mkdir %s"), argv[0]);
 522                                 mkdir_tried = 1;
 523                                 goto retry;
 524                         }
 525                         die_errno(_("cannot chdir to %s"), argv[0]);
 526                 }
 527         } else if (0 < argc) {
 528                 usage(init_db_usage[0]);
 529         }
 530         if (is_bare_repository_cfg == 1) {
 531                 char *cwd = xgetcwd();
 532                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 533                 free(cwd);
 534         }
 535
 536         if (init_shared_repository != -1)
 537                 set_shared_repository(init_shared_repository);
 538
 539         /*
 540          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 541          * without --bare.  Catch the error early.
 542          */
 543         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 544         work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 545         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 546                 die(_("%s (or --work-tree=<directory>) not allowed without "
 547                           "specifying %s (or --git-dir=<directory>)"),
 548                     GIT_WORK_TREE_ENVIRONMENT,
 549                     GIT_DIR_ENVIRONMENT);
 550
 551         /*
 552          * Set up the default .git directory contents
 553          */
 554         if (!git_dir)
 555                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 556
 557         if (is_bare_repository_cfg < 0)
 558                 is_bare_repository_cfg = guess_repository_type(git_dir);
 559
 560         if (!is_bare_repository_cfg) {
 561                 const char *git_dir_parent = strrchr(git_dir, '/');
 562                 if (git_dir_parent) {
 563                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 564                         git_work_tree_cfg = real_pathdup(rel, 1);
 565                         free(rel);
 566                 }
 567                 if (!git_work_tree_cfg)
 568                         git_work_tree_cfg = xgetcwd();
 569                 if (work_tree)
 570                         set_git_work_tree(work_tree);
 571                 else
 572                         set_git_work_tree(git_work_tree_cfg);
 573                 if (access(get_git_work_tree(), X_OK))
 574                         die_errno (_("Cannot access work tree '%s'"),
 575                                    get_git_work_tree());
 576         }
 577         else {
 578                 if (work_tree)
 579                         set_git_work_tree(work_tree);
 580         }
 581
 582         UNLEAK(real_git_dir);
 583
 584         flags |= INIT_DB_EXIST_OK;
 585         return init_db(git_dir, real_git_dir, template_dir, flags);
 586 }