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 "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
  22 static int init_is_bare_repository = 0;
  23 static int init_shared_repository = -1;
  24 static const char *init_db_template_dir;
  25 static const char *git_link;
  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         DIR *dir;
  99         char *to_free = NULL;
 100
 101         if (!template_dir)
 102                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 103         if (!template_dir)
 104                 template_dir = init_db_template_dir;
 105         if (!template_dir)
 106                 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 107         if (!template_dir[0]) {
 108                 free(to_free);
 109                 return;
 110         }
 111
 112         strbuf_addstr(&template_path, template_dir);
 113         strbuf_complete(&template_path, '/');
 114         template_len = template_path.len;
 115
 116         dir = opendir(template_path.buf);
 117         if (!dir) {
 118                 warning(_("templates not found %s"), template_dir);
 119                 goto free_return;
 120         }
 121
 122         /* Make sure that template is from the correct vintage */
 123         strbuf_addstr(&template_path, "config");
 124         repository_format_version = 0;
 125         git_config_from_file(check_repository_format_version,
 126                              template_path.buf, NULL);
 127         strbuf_setlen(&template_path, template_len);
 128
 129         if (repository_format_version &&
 130             repository_format_version != GIT_REPO_VERSION) {
 131                 warning(_("not copying templates of "
 132                         "a wrong format version %d from '%s'"),
 133                         repository_format_version,
 134                         template_dir);
 135                 goto close_free_return;
 136         }
 137
 138         strbuf_addstr(&path, get_git_dir());
 139         strbuf_complete(&path, '/');
 140         copy_templates_1(&path, &template_path, dir);
 141 close_free_return:
 142         closedir(dir);
 143 free_return:
 144         free(to_free);
 145         strbuf_release(&path);
 146         strbuf_release(&template_path);
 147 }
 148
 149 static int git_init_db_config(const char *k, const char *v, void *cb)
 150 {
 151         if (!strcmp(k, "init.templatedir"))
 152                 return git_config_pathname(&init_db_template_dir, k, v);
 153
 154         return 0;
 155 }
 156
 157 /*
 158  * If the git_dir is not directly inside the working tree, then git will not
 159  * find it by default, and we need to set the worktree explicitly.
 160  */
 161 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
 162 {
 163         if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
 164                 return 0;
 165         if (skip_prefix(git_dir, work_tree, &git_dir) &&
 166             !strcmp(git_dir, "/.git"))
 167                 return 0;
 168         return 1;
 169 }
 170
 171 static int create_default_files(const char *template_path)
 172 {
 173         struct stat st1;
 174         struct strbuf buf = STRBUF_INIT;
 175         char *path;
 176         char repo_version_string[10];
 177         char junk[2];
 178         int reinit;
 179         int filemode;
 180
 181         /*
 182          * Create .git/refs/{heads,tags}
 183          */
 184         safe_create_dir(git_path_buf(&buf, "refs"), 1);
 185         safe_create_dir(git_path_buf(&buf, "refs/heads"), 1);
 186         safe_create_dir(git_path_buf(&buf, "refs/tags"), 1);
 187
 188         /* Just look for `init.templatedir` */
 189         git_config(git_init_db_config, NULL);
 190
 191         /* First copy the templates -- we might have the default
 192          * config file there, in which case we would want to read
 193          * from it after installing.
 194          */
 195         copy_templates(template_path);
 196
 197         git_config(git_default_config, NULL);
 198         is_bare_repository_cfg = init_is_bare_repository;
 199
 200         /* reading existing config may have overwrote it */
 201         if (init_shared_repository != -1)
 202                 shared_repository = init_shared_repository;
 203
 204         /*
 205          * We would have created the above under user's umask -- under
 206          * shared-repository settings, we would need to fix them up.
 207          */
 208         if (shared_repository) {
 209                 adjust_shared_perm(get_git_dir());
 210                 adjust_shared_perm(git_path_buf(&buf, "refs"));
 211                 adjust_shared_perm(git_path_buf(&buf, "refs/heads"));
 212                 adjust_shared_perm(git_path_buf(&buf, "refs/tags"));
 213         }
 214
 215         /*
 216          * Create the default symlink from ".git/HEAD" to the "master"
 217          * branch, if it does not exist yet.
 218          */
 219         path = git_path_buf(&buf, "HEAD");
 220         reinit = (!access(path, R_OK)
 221                   || readlink(path, junk, sizeof(junk)-1) != -1);
 222         if (!reinit) {
 223                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 224                         exit(1);
 225         }
 226
 227         /* This forces creation of new config file */
 228         xsnprintf(repo_version_string, sizeof(repo_version_string),
 229                   "%d", GIT_REPO_VERSION);
 230         git_config_set("core.repositoryformatversion", repo_version_string);
 231
 232         /* Check filemode trustability */
 233         path = git_path_buf(&buf, "config");
 234         filemode = TEST_FILEMODE;
 235         if (TEST_FILEMODE && !lstat(path, &st1)) {
 236                 struct stat st2;
 237                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 238                                 !lstat(path, &st2) &&
 239                                 st1.st_mode != st2.st_mode &&
 240                                 !chmod(path, st1.st_mode));
 241                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 242                         filemode = 0;
 243         }
 244         git_config_set("core.filemode", filemode ? "true" : "false");
 245
 246         if (is_bare_repository())
 247                 git_config_set("core.bare", "true");
 248         else {
 249                 const char *work_tree = get_git_work_tree();
 250                 git_config_set("core.bare", "false");
 251                 /* allow template config file to override the default */
 252                 if (log_all_ref_updates == -1)
 253                         git_config_set("core.logallrefupdates", "true");
 254                 if (needs_work_tree_config(get_git_dir(), work_tree))
 255                         git_config_set("core.worktree", work_tree);
 256         }
 257
 258         if (!reinit) {
 259                 /* Check if symlink is supported in the work tree */
 260                 path = git_path_buf(&buf, "tXXXXXX");
 261                 if (!close(xmkstemp(path)) &&
 262                     !unlink(path) &&
 263                     !symlink("testing", path) &&
 264                     !lstat(path, &st1) &&
 265                     S_ISLNK(st1.st_mode))
 266                         unlink(path); /* good */
 267                 else
 268                         git_config_set("core.symlinks", "false");
 269
 270                 /* Check if the filesystem is case-insensitive */
 271                 path = git_path_buf(&buf, "CoNfIg");
 272                 if (!access(path, F_OK))
 273                         git_config_set("core.ignorecase", "true");
 274                 probe_utf8_pathname_composition();
 275         }
 276
 277         strbuf_release(&buf);
 278         return reinit;
 279 }
 280
 281 static void create_object_directory(void)
 282 {
 283         struct strbuf path = STRBUF_INIT;
 284         size_t baselen;
 285
 286         strbuf_addstr(&path, get_object_directory());
 287         baselen = path.len;
 288
 289         safe_create_dir(path.buf, 1);
 290
 291         strbuf_setlen(&path, baselen);
 292         strbuf_addstr(&path, "/pack");
 293         safe_create_dir(path.buf, 1);
 294
 295         strbuf_setlen(&path, baselen);
 296         strbuf_addstr(&path, "/info");
 297         safe_create_dir(path.buf, 1);
 298
 299         strbuf_release(&path);
 300 }
 301
 302 int set_git_dir_init(const char *git_dir, const char *real_git_dir,
 303                      int exist_ok)
 304 {
 305         if (real_git_dir) {
 306                 struct stat st;
 307
 308                 if (!exist_ok && !stat(git_dir, &st))
 309                         die(_("%s already exists"), git_dir);
 310
 311                 if (!exist_ok && !stat(real_git_dir, &st))
 312                         die(_("%s already exists"), real_git_dir);
 313
 314                 /*
 315                  * make sure symlinks are resolved because we'll be
 316                  * moving the target repo later on in separate_git_dir()
 317                  */
 318                 git_link = xstrdup(real_path(git_dir));
 319                 set_git_dir(real_path(real_git_dir));
 320         }
 321         else {
 322                 set_git_dir(real_path(git_dir));
 323                 git_link = NULL;
 324         }
 325         startup_info->have_repository = 1;
 326         return 0;
 327 }
 328
 329 static void separate_git_dir(const char *git_dir)
 330 {
 331         struct stat st;
 332
 333         if (!stat(git_link, &st)) {
 334                 const char *src;
 335
 336                 if (S_ISREG(st.st_mode))
 337                         src = read_gitfile(git_link);
 338                 else if (S_ISDIR(st.st_mode))
 339                         src = git_link;
 340                 else
 341                         die(_("unable to handle file type %d"), (int)st.st_mode);
 342
 343                 if (rename(src, git_dir))
 344                         die_errno(_("unable to move %s to %s"), src, git_dir);
 345         }
 346
 347         write_file(git_link, "gitdir: %s", git_dir);
 348 }
 349
 350 int init_db(const char *template_dir, unsigned int flags)
 351 {
 352         int reinit;
 353         const char *git_dir = get_git_dir();
 354
 355         if (git_link)
 356                 separate_git_dir(git_dir);
 357
 358         safe_create_dir(git_dir, 0);
 359
 360         init_is_bare_repository = is_bare_repository();
 361
 362         /* Check to see if the repository version is right.
 363          * Note that a newly created repository does not have
 364          * config file, so this will not fail.  What we are catching
 365          * is an attempt to reinitialize new repository with an old tool.
 366          */
 367         check_repository_format();
 368
 369         reinit = create_default_files(template_dir);
 370
 371         create_object_directory();
 372
 373         if (shared_repository) {
 374                 char buf[10];
 375                 /* We do not spell "group" and such, so that
 376                  * the configuration can be read by older version
 377                  * of git. Note, we use octal numbers for new share modes,
 378                  * and compatibility values for PERM_GROUP and
 379                  * PERM_EVERYBODY.
 380                  */
 381                 if (shared_repository < 0)
 382                         /* force to the mode value */
 383                         xsnprintf(buf, sizeof(buf), "0%o", -shared_repository);
 384                 else if (shared_repository == PERM_GROUP)
 385                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 386                 else if (shared_repository == PERM_EVERYBODY)
 387                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 388                 else
 389                         die("BUG: invalid value for shared_repository");
 390                 git_config_set("core.sharedrepository", buf);
 391                 git_config_set("receive.denyNonFastforwards", "true");
 392         }
 393
 394         if (!(flags & INIT_DB_QUIET)) {
 395                 int len = strlen(git_dir);
 396
 397                 /* TRANSLATORS: The first '%s' is either "Reinitialized
 398                    existing" or "Initialized empty", the second " shared" or
 399                    "", and the last '%s%s' is the verbatim directory name. */
 400                 printf(_("%s%s Git repository in %s%s\n"),
 401                        reinit ? _("Reinitialized existing") : _("Initialized empty"),
 402                        shared_repository ? _(" shared") : "",
 403                        git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 404         }
 405
 406         return 0;
 407 }
 408
 409 static int guess_repository_type(const char *git_dir)
 410 {
 411         const char *slash;
 412         char *cwd;
 413         int cwd_is_git_dir;
 414
 415         /*
 416          * "GIT_DIR=. git init" is always bare.
 417          * "GIT_DIR=`pwd` git init" too.
 418          */
 419         if (!strcmp(".", git_dir))
 420                 return 1;
 421         cwd = xgetcwd();
 422         cwd_is_git_dir = !strcmp(git_dir, cwd);
 423         free(cwd);
 424         if (cwd_is_git_dir)
 425                 return 1;
 426         /*
 427          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 428          */
 429         if (!strcmp(git_dir, ".git"))
 430                 return 0;
 431         slash = strrchr(git_dir, '/');
 432         if (slash && !strcmp(slash, "/.git"))
 433                 return 0;
 434
 435         /*
 436          * Otherwise it is often bare.  At this point
 437          * we are just guessing.
 438          */
 439         return 1;
 440 }
 441
 442 static int shared_callback(const struct option *opt, const char *arg, int unset)
 443 {
 444         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 445         return 0;
 446 }
 447
 448 static const char *const init_db_usage[] = {
 449         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 450         NULL
 451 };
 452
 453 /*
 454  * If you want to, you can share the DB area with any number of branches.
 455  * That has advantages: you can save space by sharing all the SHA1 objects.
 456  * On the other hand, it might just make lookup slower and messier. You
 457  * be the judge.  The default case is to have one DB per managed directory.
 458  */
 459 int cmd_init_db(int argc, const char **argv, const char *prefix)
 460 {
 461         const char *git_dir;
 462         const char *real_git_dir = NULL;
 463         const char *work_tree;
 464         const char *template_dir = NULL;
 465         unsigned int flags = 0;
 466         const struct option init_db_options[] = {
 467                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 468                                 N_("directory from which templates will be used")),
 469                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 470                                 N_("create a bare repository"), 1),
 471                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 472                         N_("permissions"),
 473                         N_("specify that the git repository is to be shared amongst several users"),
 474                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 475                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 476                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 477                            N_("separate git dir from working tree")),
 478                 OPT_END()
 479         };
 480
 481         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 482
 483         if (real_git_dir && !is_absolute_path(real_git_dir))
 484                 real_git_dir = xstrdup(real_path(real_git_dir));
 485
 486         if (argc == 1) {
 487                 int mkdir_tried = 0;
 488         retry:
 489                 if (chdir(argv[0]) < 0) {
 490                         if (!mkdir_tried) {
 491                                 int saved;
 492                                 /*
 493                                  * At this point we haven't read any configuration,
 494                                  * and we know shared_repository should always be 0;
 495                                  * but just in case we play safe.
 496                                  */
 497                                 saved = shared_repository;
 498                                 shared_repository = 0;
 499                                 switch (safe_create_leading_directories_const(argv[0])) {
 500                                 case SCLD_OK:
 501                                 case SCLD_PERMS:
 502                                         break;
 503                                 case SCLD_EXISTS:
 504                                         errno = EEXIST;
 505                                         /* fallthru */
 506                                 default:
 507                                         die_errno(_("cannot mkdir %s"), argv[0]);
 508                                         break;
 509                                 }
 510                                 shared_repository = saved;
 511                                 if (mkdir(argv[0], 0777) < 0)
 512                                         die_errno(_("cannot mkdir %s"), argv[0]);
 513                                 mkdir_tried = 1;
 514                                 goto retry;
 515                         }
 516                         die_errno(_("cannot chdir to %s"), argv[0]);
 517                 }
 518         } else if (0 < argc) {
 519                 usage(init_db_usage[0]);
 520         }
 521         if (is_bare_repository_cfg == 1) {
 522                 char *cwd = xgetcwd();
 523                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 524                 free(cwd);
 525         }
 526
 527         if (init_shared_repository != -1)
 528                 shared_repository = init_shared_repository;
 529
 530         /*
 531          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 532          * without --bare.  Catch the error early.
 533          */
 534         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 535         work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 536         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 537                 die(_("%s (or --work-tree=<directory>) not allowed without "
 538                           "specifying %s (or --git-dir=<directory>)"),
 539                     GIT_WORK_TREE_ENVIRONMENT,
 540                     GIT_DIR_ENVIRONMENT);
 541
 542         /*
 543          * Set up the default .git directory contents
 544          */
 545         if (!git_dir)
 546                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 547
 548         if (is_bare_repository_cfg < 0)
 549                 is_bare_repository_cfg = guess_repository_type(git_dir);
 550
 551         if (!is_bare_repository_cfg) {
 552                 const char *git_dir_parent = strrchr(git_dir, '/');
 553                 if (git_dir_parent) {
 554                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 555                         git_work_tree_cfg = xstrdup(real_path(rel));
 556                         free(rel);
 557                 }
 558                 if (!git_work_tree_cfg)
 559                         git_work_tree_cfg = xgetcwd();
 560                 if (work_tree)
 561                         set_git_work_tree(work_tree);
 562                 else
 563                         set_git_work_tree(git_work_tree_cfg);
 564                 if (access(get_git_work_tree(), X_OK))
 565                         die_errno (_("Cannot access work tree '%s'"),
 566                                    get_git_work_tree());
 567         }
 568         else {
 569                 if (work_tree)
 570                         set_git_work_tree(work_tree);
 571         }
 572
 573         set_git_dir_init(git_dir, real_git_dir, 1);
 574
 575         return init_db(template_dir, flags);
 576 }