git.oblomov.eu Git - git/blob - 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_path,
  28                              DIR *dir)
  29 {
  30         size_t path_baselen = path->len;
  31         size_t template_baselen = template_path->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_path, template_baselen);
  48
  49                 if (de->d_name[0] == '.')
  50                         continue;
  51                 strbuf_addstr(path, de->d_name);
  52                 strbuf_addstr(template_path, 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_path->buf, &st_template))
  61                         die_errno(_("cannot stat template '%s'"), template_path->buf);
  62
  63                 if (S_ISDIR(st_template.st_mode)) {
  64                         DIR *subdir = opendir(template_path->buf);
  65                         if (!subdir)
  66                                 die_errno(_("cannot opendir '%s'"), template_path->buf);
  67                         strbuf_addch(path, '/');
  68                         strbuf_addch(template_path, '/');
  69                         copy_templates_1(path, template_path, 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_path->buf,
  77                                             st_template.st_size) < 0)
  78                                 die_errno(_("cannot readlink '%s'"), template_path->buf);
  79                         if (symlink(lnk.buf, path->buf))
  80                                 die_errno(_("cannot symlink '%s' '%s'"),
  81                                           lnk.buf, path->buf);
  82                         strbuf_release(&lnk);
  83                 }
  84                 else if (S_ISREG(st_template.st_mode)) {
  85                         if (copy_file(path->buf, template_path->buf, st_template.st_mode))
  86                                 die_errno(_("cannot copy '%s' to '%s'"),
  87                                           template_path->buf, path->buf);
  88                 }
  89                 else
  90                         error(_("ignoring template %s"), template_path->buf);
  91         }
  92 }
  93
  94 static void copy_templates(const char *template_dir)
  95 {
  96         struct strbuf path = STRBUF_INIT;
  97         struct strbuf template_path = STRBUF_INIT;
  98         size_t template_len;
  99         struct repository_format template_format;
 100         struct strbuf err = STRBUF_INIT;
 101         DIR *dir;
 102         char *to_free = NULL;
 103
 104         if (!template_dir)
 105                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 106         if (!template_dir)
 107                 template_dir = init_db_template_dir;
 108         if (!template_dir)
 109                 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 110         if (!template_dir[0]) {
 111                 free(to_free);
 112                 return;
 113         }
 114
 115         strbuf_addstr(&template_path, template_dir);
 116         strbuf_complete(&template_path, '/');
 117         template_len = template_path.len;
 118
 119         dir = opendir(template_path.buf);
 120         if (!dir) {
 121                 warning(_("templates not found in %s"), template_dir);
 122                 goto free_return;
 123         }
 124
 125         /* Make sure that template is from the correct vintage */
 126         strbuf_addstr(&template_path, "config");
 127         read_repository_format(&template_format, template_path.buf);
 128         strbuf_setlen(&template_path, template_len);
 129
 130         /*
 131          * No mention of version at all is OK, but anything else should be
 132          * verified.
 133          */
 134         if (template_format.version >= 0 &&
 135             verify_repository_format(&template_format, &err) < 0) {
 136                 warning(_("not copying templates from '%s': %s"),
 137                           template_dir, err.buf);
 138                 strbuf_release(&err);
 139                 goto close_free_return;
 140         }
 141
 142         strbuf_addstr(&path, get_git_common_dir());
 143         strbuf_complete(&path, '/');
 144         copy_templates_1(&path, &template_path, dir);
 145 close_free_return:
 146         closedir(dir);
 147 free_return:
 148         free(to_free);
 149         strbuf_release(&path);
 150         strbuf_release(&template_path);
 151 }
 152
 153 static int git_init_db_config(const char *k, const char *v, void *cb)
 154 {
 155         if (!strcmp(k, "init.templatedir"))
 156                 return git_config_pathname(&init_db_template_dir, k, v);
 157
 158         if (starts_with(k, "core."))
 159                 return platform_core_config(k, v, cb);
 160
 161         return 0;
 162 }
 163
 164 /*
 165  * If the git_dir is not directly inside the working tree, then git will not
 166  * find it by default, and we need to set the worktree explicitly.
 167  */
 168 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
 169 {
 170         if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
 171                 return 0;
 172         if (skip_prefix(git_dir, work_tree, &git_dir) &&
 173             !strcmp(git_dir, "/.git"))
 174                 return 0;
 175         return 1;
 176 }
 177
 178 static int create_default_files(const char *template_path,
 179                                 const char *original_git_dir)
 180 {
 181         struct stat st1;
 182         struct strbuf buf = STRBUF_INIT;
 183         char *path;
 184         char repo_version_string[10];
 185         char junk[2];
 186         int reinit;
 187         int filemode;
 188         struct strbuf err = STRBUF_INIT;
 189
 190         /* Just look for `init.templatedir` */
 191         init_db_template_dir = NULL; /* re-set in case it was set before */
 192         git_config(git_init_db_config, NULL);
 193
 194         /*
 195          * First copy the templates -- we might have the default
 196          * config file there, in which case we would want to read
 197          * from it after installing.
 198          *
 199          * Before reading that config, we also need to clear out any cached
 200          * values (since we've just potentially changed what's available on
 201          * disk).
 202          */
 203         copy_templates(template_path);
 204         git_config_clear();
 205         reset_shared_repository();
 206         git_config(git_default_config, NULL);
 207
 208         /*
 209          * We must make sure command-line options continue to override any
 210          * values we might have just re-read from the config.
 211          */
 212         is_bare_repository_cfg = init_is_bare_repository;
 213         if (init_shared_repository != -1)
 214                 set_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 (get_shared_repository()) {
 221                 adjust_shared_perm(get_git_dir());
 222         }
 223
 224         /*
 225          * We need to create a "refs" dir in any case so that older
 226          * versions of git can tell that this is a repository.
 227          */
 228         safe_create_dir(git_path("refs"), 1);
 229         adjust_shared_perm(git_path("refs"));
 230
 231         if (refs_init_db(&err))
 232                 die("failed to set up refs db: %s", err.buf);
 233
 234         /*
 235          * Create the default symlink from ".git/HEAD" to the "master"
 236          * branch, if it does not exist yet.
 237          */
 238         path = git_path_buf(&buf, "HEAD");
 239         reinit = (!access(path, R_OK)
 240                   || readlink(path, junk, sizeof(junk)-1) != -1);
 241         if (!reinit) {
 242                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 243                         exit(1);
 244         }
 245
 246         /* This forces creation of new config file */
 247         xsnprintf(repo_version_string, sizeof(repo_version_string),
 248                   "%d", GIT_REPO_VERSION);
 249         git_config_set("core.repositoryformatversion", repo_version_string);
 250
 251         /* Check filemode trustability */
 252         path = git_path_buf(&buf, "config");
 253         filemode = TEST_FILEMODE;
 254         if (TEST_FILEMODE && !lstat(path, &st1)) {
 255                 struct stat st2;
 256                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 257                                 !lstat(path, &st2) &&
 258                                 st1.st_mode != st2.st_mode &&
 259                                 !chmod(path, st1.st_mode));
 260                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 261                         filemode = 0;
 262         }
 263         git_config_set("core.filemode", filemode ? "true" : "false");
 264
 265         if (is_bare_repository())
 266                 git_config_set("core.bare", "true");
 267         else {
 268                 const char *work_tree = get_git_work_tree();
 269                 git_config_set("core.bare", "false");
 270                 /* allow template config file to override the default */
 271                 if (log_all_ref_updates == LOG_REFS_UNSET)
 272                         git_config_set("core.logallrefupdates", "true");
 273                 if (needs_work_tree_config(original_git_dir, work_tree))
 274                         git_config_set("core.worktree", work_tree);
 275         }
 276
 277         if (!reinit) {
 278                 /* Check if symlink is supported in the work tree */
 279                 path = git_path_buf(&buf, "tXXXXXX");
 280                 if (!close(xmkstemp(path)) &&
 281                     !unlink(path) &&
 282                     !symlink("testing", path) &&
 283                     !lstat(path, &st1) &&
 284                     S_ISLNK(st1.st_mode))
 285                         unlink(path); /* good */
 286                 else
 287                         git_config_set("core.symlinks", "false");
 288
 289                 /* Check if the filesystem is case-insensitive */
 290                 path = git_path_buf(&buf, "CoNfIg");
 291                 if (!access(path, F_OK))
 292                         git_config_set("core.ignorecase", "true");
 293                 probe_utf8_pathname_composition();
 294         }
 295
 296         strbuf_release(&buf);
 297         return reinit;
 298 }
 299
 300 static void create_object_directory(void)
 301 {
 302         struct strbuf path = STRBUF_INIT;
 303         size_t baselen;
 304
 305         strbuf_addstr(&path, get_object_directory());
 306         baselen = path.len;
 307
 308         safe_create_dir(path.buf, 1);
 309
 310         strbuf_setlen(&path, baselen);
 311         strbuf_addstr(&path, "/pack");
 312         safe_create_dir(path.buf, 1);
 313
 314         strbuf_setlen(&path, baselen);
 315         strbuf_addstr(&path, "/info");
 316         safe_create_dir(path.buf, 1);
 317
 318         strbuf_release(&path);
 319 }
 320
 321 static void separate_git_dir(const char *git_dir, const char *git_link)
 322 {
 323         struct stat st;
 324
 325         if (!stat(git_link, &st)) {
 326                 const char *src;
 327
 328                 if (S_ISREG(st.st_mode))
 329                         src = read_gitfile(git_link);
 330                 else if (S_ISDIR(st.st_mode))
 331                         src = git_link;
 332                 else
 333                         die(_("unable to handle file type %d"), (int)st.st_mode);
 334
 335                 if (rename(src, git_dir))
 336                         die_errno(_("unable to move %s to %s"), src, git_dir);
 337         }
 338
 339         write_file(git_link, "gitdir: %s", git_dir);
 340 }
 341
 342 int init_db(const char *git_dir, const char *real_git_dir,
 343             const char *template_dir, unsigned int flags)
 344 {
 345         int reinit;
 346         int exist_ok = flags & INIT_DB_EXIST_OK;
 347         char *original_git_dir = real_pathdup(git_dir, 1);
 348
 349         if (real_git_dir) {
 350                 struct stat st;
 351
 352                 if (!exist_ok && !stat(git_dir, &st))
 353                         die(_("%s already exists"), git_dir);
 354
 355                 if (!exist_ok && !stat(real_git_dir, &st))
 356                         die(_("%s already exists"), real_git_dir);
 357
 358                 set_git_dir(real_path(real_git_dir));
 359                 git_dir = get_git_dir();
 360                 separate_git_dir(git_dir, original_git_dir);
 361         }
 362         else {
 363                 set_git_dir(real_path(git_dir));
 364                 git_dir = get_git_dir();
 365         }
 366         startup_info->have_repository = 1;
 367
 368         /* Just look for `core.hidedotfiles` */
 369         git_config(git_init_db_config, NULL);
 370
 371         safe_create_dir(git_dir, 0);
 372
 373         init_is_bare_repository = is_bare_repository();
 374
 375         /* Check to see if the repository version is right.
 376          * Note that a newly created repository does not have
 377          * config file, so this will not fail.  What we are catching
 378          * is an attempt to reinitialize new repository with an old tool.
 379          */
 380         check_repository_format();
 381
 382         reinit = create_default_files(template_dir, original_git_dir);
 383
 384         create_object_directory();
 385
 386         if (get_shared_repository()) {
 387                 char buf[10];
 388                 /* We do not spell "group" and such, so that
 389                  * the configuration can be read by older version
 390                  * of git. Note, we use octal numbers for new share modes,
 391                  * and compatibility values for PERM_GROUP and
 392                  * PERM_EVERYBODY.
 393                  */
 394                 if (get_shared_repository() < 0)
 395                         /* force to the mode value */
 396                         xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
 397                 else if (get_shared_repository() == PERM_GROUP)
 398                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 399                 else if (get_shared_repository() == PERM_EVERYBODY)
 400                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 401                 else
 402                         BUG("invalid value for shared_repository");
 403                 git_config_set("core.sharedrepository", buf);
 404                 git_config_set("receive.denyNonFastforwards", "true");
 405         }
 406
 407         if (!(flags & INIT_DB_QUIET)) {
 408                 int len = strlen(git_dir);
 409
 410                 if (reinit)
 411                         printf(get_shared_repository()
 412                                ? _("Reinitialized existing shared Git repository in %s%s\n")
 413                                : _("Reinitialized existing Git repository in %s%s\n"),
 414                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 415                 else
 416                         printf(get_shared_repository()
 417                                ? _("Initialized empty shared Git repository in %s%s\n")
 418                                : _("Initialized empty Git repository in %s%s\n"),
 419                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 420         }
 421
 422         free(original_git_dir);
 423         return 0;
 424 }
 425
 426 static int guess_repository_type(const char *git_dir)
 427 {
 428         const char *slash;
 429         char *cwd;
 430         int cwd_is_git_dir;
 431
 432         /*
 433          * "GIT_DIR=. git init" is always bare.
 434          * "GIT_DIR=`pwd` git init" too.
 435          */
 436         if (!strcmp(".", git_dir))
 437                 return 1;
 438         cwd = xgetcwd();
 439         cwd_is_git_dir = !strcmp(git_dir, cwd);
 440         free(cwd);
 441         if (cwd_is_git_dir)
 442                 return 1;
 443         /*
 444          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 445          */
 446         if (!strcmp(git_dir, ".git"))
 447                 return 0;
 448         slash = strrchr(git_dir, '/');
 449         if (slash && !strcmp(slash, "/.git"))
 450                 return 0;
 451
 452         /*
 453          * Otherwise it is often bare.  At this point
 454          * we are just guessing.
 455          */
 456         return 1;
 457 }
 458
 459 static int shared_callback(const struct option *opt, const char *arg, int unset)
 460 {
 461         BUG_ON_OPT_NEG(unset);
 462         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 463         return 0;
 464 }
 465
 466 static const char *const init_db_usage[] = {
 467         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 468         NULL
 469 };
 470
 471 /*
 472  * If you want to, you can share the DB area with any number of branches.
 473  * That has advantages: you can save space by sharing all the SHA1 objects.
 474  * On the other hand, it might just make lookup slower and messier. You
 475  * be the judge.  The default case is to have one DB per managed directory.
 476  */
 477 int cmd_init_db(int argc, const char **argv, const char *prefix)
 478 {
 479         const char *git_dir;
 480         const char *real_git_dir = NULL;
 481         const char *work_tree;
 482         const char *template_dir = NULL;
 483         unsigned int flags = 0;
 484         const struct option init_db_options[] = {
 485                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 486                                 N_("directory from which templates will be used")),
 487                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 488                                 N_("create a bare repository"), 1),
 489                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 490                         N_("permissions"),
 491                         N_("specify that the git repository is to be shared amongst several users"),
 492                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 493                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 494                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 495                            N_("separate git dir from working tree")),
 496                 OPT_END()
 497         };
 498
 499         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 500
 501         if (real_git_dir && !is_absolute_path(real_git_dir))
 502                 real_git_dir = real_pathdup(real_git_dir, 1);
 503
 504         if (argc == 1) {
 505                 int mkdir_tried = 0;
 506         retry:
 507                 if (chdir(argv[0]) < 0) {
 508                         if (!mkdir_tried) {
 509                                 int saved;
 510                                 /*
 511                                  * At this point we haven't read any configuration,
 512                                  * and we know shared_repository should always be 0;
 513                                  * but just in case we play safe.
 514                                  */
 515                                 saved = get_shared_repository();
 516                                 set_shared_repository(0);
 517                                 switch (safe_create_leading_directories_const(argv[0])) {
 518                                 case SCLD_OK:
 519                                 case SCLD_PERMS:
 520                                         break;
 521                                 case SCLD_EXISTS:
 522                                         errno = EEXIST;
 523                                         /* fallthru */
 524                                 default:
 525                                         die_errno(_("cannot mkdir %s"), argv[0]);
 526                                         break;
 527                                 }
 528                                 set_shared_repository(saved);
 529                                 if (mkdir(argv[0], 0777) < 0)
 530                                         die_errno(_("cannot mkdir %s"), argv[0]);
 531                                 mkdir_tried = 1;
 532                                 goto retry;
 533                         }
 534                         die_errno(_("cannot chdir to %s"), argv[0]);
 535                 }
 536         } else if (0 < argc) {
 537                 usage(init_db_usage[0]);
 538         }
 539         if (is_bare_repository_cfg == 1) {
 540                 char *cwd = xgetcwd();
 541                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 542                 free(cwd);
 543         }
 544
 545         if (init_shared_repository != -1)
 546                 set_shared_repository(init_shared_repository);
 547
 548         /*
 549          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 550          * without --bare.  Catch the error early.
 551          */
 552         git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
 553         work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
 554         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 555                 die(_("%s (or --work-tree=<directory>) not allowed without "
 556                           "specifying %s (or --git-dir=<directory>)"),
 557                     GIT_WORK_TREE_ENVIRONMENT,
 558                     GIT_DIR_ENVIRONMENT);
 559
 560         /*
 561          * Set up the default .git directory contents
 562          */
 563         if (!git_dir)
 564                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 565
 566         if (is_bare_repository_cfg < 0)
 567                 is_bare_repository_cfg = guess_repository_type(git_dir);
 568
 569         if (!is_bare_repository_cfg) {
 570                 const char *git_dir_parent = strrchr(git_dir, '/');
 571                 if (git_dir_parent) {
 572                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 573                         git_work_tree_cfg = real_pathdup(rel, 1);
 574                         free(rel);
 575                 }
 576                 if (!git_work_tree_cfg)
 577                         git_work_tree_cfg = xgetcwd();
 578                 if (work_tree)
 579                         set_git_work_tree(work_tree);
 580                 else
 581                         set_git_work_tree(git_work_tree_cfg);
 582                 if (access(get_git_work_tree(), X_OK))
 583                         die_errno (_("Cannot access work tree '%s'"),
 584                                    get_git_work_tree());
 585         }
 586         else {
 587                 if (work_tree)
 588                         set_git_work_tree(work_tree);
 589         }
 590
 591         UNLEAK(real_git_dir);
 592         UNLEAK(git_dir);
 593         UNLEAK(work_tree);
 594
 595         flags |= INIT_DB_EXIST_OK;
 596         return init_db(git_dir, real_git_dir, template_dir, flags);
 597 }