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         struct repository_format template_format;
  99         struct strbuf err = STRBUF_INIT;
 100         DIR *dir;
 101         char *to_free = NULL;
 102
 103         if (!template_dir)
 104                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 105         if (!template_dir)
 106                 template_dir = init_db_template_dir;
 107         if (!template_dir)
 108                 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 109         if (!template_dir[0]) {
 110                 free(to_free);
 111                 return;
 112         }
 113
 114         strbuf_addstr(&template_path, template_dir);
 115         strbuf_complete(&template_path, '/');
 116         template_len = template_path.len;
 117
 118         dir = opendir(template_path.buf);
 119         if (!dir) {
 120                 warning(_("templates not found %s"), template_dir);
 121                 goto free_return;
 122         }
 123
 124         /* Make sure that template is from the correct vintage */
 125         strbuf_addstr(&template_path, "config");
 126         read_repository_format(&template_format, template_path.buf);
 127         strbuf_setlen(&template_path, template_len);
 128
 129         /*
 130          * No mention of version at all is OK, but anything else should be
 131          * verified.
 132          */
 133         if (template_format.version >= 0 &&
 134             verify_repository_format(&template_format, &err) < 0) {
 135                 warning(_("not copying templates from '%s': %s"),
 136                           template_dir, err.buf);
 137                 strbuf_release(&err);
 138                 goto close_free_return;
 139         }
 140
 141         strbuf_addstr(&path, get_git_dir());
 142         strbuf_complete(&path, '/');
 143         copy_templates_1(&path, &template_path, dir);
 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 {
 176         struct stat st1;
 177         struct strbuf buf = STRBUF_INIT;
 178         char *path;
 179         char repo_version_string[10];
 180         char junk[2];
 181         int reinit;
 182         int filemode;
 183         struct strbuf err = STRBUF_INIT;
 184
 185         /* Just look for `init.templatedir` */
 186         git_config(git_init_db_config, NULL);
 187
 188         /*
 189          * First copy the templates -- we might have the default
 190          * config file there, in which case we would want to read
 191          * from it after installing.
 192          *
 193          * Before reading that config, we also need to clear out any cached
 194          * values (since we've just potentially changed what's available on
 195          * disk).
 196          */
 197         copy_templates(template_path);
 198         git_config_clear();
 199         reset_shared_repository();
 200         git_config(git_default_config, NULL);
 201
 202         /*
 203          * We must make sure command-line options continue to override any
 204          * values we might have just re-read from the config.
 205          */
 206         is_bare_repository_cfg = init_is_bare_repository;
 207         if (init_shared_repository != -1)
 208                 set_shared_repository(init_shared_repository);
 209
 210         /*
 211          * We would have created the above under user's umask -- under
 212          * shared-repository settings, we would need to fix them up.
 213          */
 214         if (get_shared_repository()) {
 215                 adjust_shared_perm(get_git_dir());
 216         }
 217
 218         /*
 219          * We need to create a "refs" dir in any case so that older
 220          * versions of git can tell that this is a repository.
 221          */
 222         safe_create_dir(git_path("refs"), 1);
 223         adjust_shared_perm(git_path("refs"));
 224
 225         if (refs_init_db(&err))
 226                 die("failed to set up refs db: %s", err.buf);
 227
 228         /*
 229          * Create the default symlink from ".git/HEAD" to the "master"
 230          * branch, if it does not exist yet.
 231          */
 232         path = git_path_buf(&buf, "HEAD");
 233         reinit = (!access(path, R_OK)
 234                   || readlink(path, junk, sizeof(junk)-1) != -1);
 235         if (!reinit) {
 236                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 237                         exit(1);
 238         }
 239
 240         /* This forces creation of new config file */
 241         xsnprintf(repo_version_string, sizeof(repo_version_string),
 242                   "%d", GIT_REPO_VERSION);
 243         git_config_set("core.repositoryformatversion", repo_version_string);
 244
 245         /* Check filemode trustability */
 246         path = git_path_buf(&buf, "config");
 247         filemode = TEST_FILEMODE;
 248         if (TEST_FILEMODE && !lstat(path, &st1)) {
 249                 struct stat st2;
 250                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 251                                 !lstat(path, &st2) &&
 252                                 st1.st_mode != st2.st_mode &&
 253                                 !chmod(path, st1.st_mode));
 254                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 255                         filemode = 0;
 256         }
 257         git_config_set("core.filemode", filemode ? "true" : "false");
 258
 259         if (is_bare_repository())
 260                 git_config_set("core.bare", "true");
 261         else {
 262                 const char *work_tree = get_git_work_tree();
 263                 git_config_set("core.bare", "false");
 264                 /* allow template config file to override the default */
 265                 if (log_all_ref_updates == -1)
 266                         git_config_set("core.logallrefupdates", "true");
 267                 if (needs_work_tree_config(get_git_dir(), work_tree))
 268                         git_config_set("core.worktree", work_tree);
 269         }
 270
 271         if (!reinit) {
 272                 /* Check if symlink is supported in the work tree */
 273                 path = git_path_buf(&buf, "tXXXXXX");
 274                 if (!close(xmkstemp(path)) &&
 275                     !unlink(path) &&
 276                     !symlink("testing", path) &&
 277                     !lstat(path, &st1) &&
 278                     S_ISLNK(st1.st_mode))
 279                         unlink(path); /* good */
 280                 else
 281                         git_config_set("core.symlinks", "false");
 282
 283                 /* Check if the filesystem is case-insensitive */
 284                 path = git_path_buf(&buf, "CoNfIg");
 285                 if (!access(path, F_OK))
 286                         git_config_set("core.ignorecase", "true");
 287                 probe_utf8_pathname_composition();
 288         }
 289
 290         strbuf_release(&buf);
 291         return reinit;
 292 }
 293
 294 static void create_object_directory(void)
 295 {
 296         struct strbuf path = STRBUF_INIT;
 297         size_t baselen;
 298
 299         strbuf_addstr(&path, get_object_directory());
 300         baselen = path.len;
 301
 302         safe_create_dir(path.buf, 1);
 303
 304         strbuf_setlen(&path, baselen);
 305         strbuf_addstr(&path, "/pack");
 306         safe_create_dir(path.buf, 1);
 307
 308         strbuf_setlen(&path, baselen);
 309         strbuf_addstr(&path, "/info");
 310         safe_create_dir(path.buf, 1);
 311
 312         strbuf_release(&path);
 313 }
 314
 315 int set_git_dir_init(const char *git_dir, const char *real_git_dir,
 316                      int exist_ok)
 317 {
 318         if (real_git_dir) {
 319                 struct stat st;
 320
 321                 if (!exist_ok && !stat(git_dir, &st))
 322                         die(_("%s already exists"), git_dir);
 323
 324                 if (!exist_ok && !stat(real_git_dir, &st))
 325                         die(_("%s already exists"), real_git_dir);
 326
 327                 /*
 328                  * make sure symlinks are resolved because we'll be
 329                  * moving the target repo later on in separate_git_dir()
 330                  */
 331                 git_link = xstrdup(real_path(git_dir));
 332                 set_git_dir(real_path(real_git_dir));
 333         }
 334         else {
 335                 set_git_dir(real_path(git_dir));
 336                 git_link = NULL;
 337         }
 338         startup_info->have_repository = 1;
 339         return 0;
 340 }
 341
 342 static void separate_git_dir(const char *git_dir)
 343 {
 344         struct stat st;
 345
 346         if (!stat(git_link, &st)) {
 347                 const char *src;
 348
 349                 if (S_ISREG(st.st_mode))
 350                         src = read_gitfile(git_link);
 351                 else if (S_ISDIR(st.st_mode))
 352                         src = git_link;
 353                 else
 354                         die(_("unable to handle file type %d"), (int)st.st_mode);
 355
 356                 if (rename(src, git_dir))
 357                         die_errno(_("unable to move %s to %s"), src, git_dir);
 358         }
 359
 360         write_file(git_link, "gitdir: %s", git_dir);
 361 }
 362
 363 int init_db(const char *template_dir, unsigned int flags)
 364 {
 365         int reinit;
 366         const char *git_dir = get_git_dir();
 367
 368         if (git_link)
 369                 separate_git_dir(git_dir);
 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);
 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                         die("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         return 0;
 423 }
 424
 425 static int guess_repository_type(const char *git_dir)
 426 {
 427         const char *slash;
 428         char *cwd;
 429         int cwd_is_git_dir;
 430
 431         /*
 432          * "GIT_DIR=. git init" is always bare.
 433          * "GIT_DIR=`pwd` git init" too.
 434          */
 435         if (!strcmp(".", git_dir))
 436                 return 1;
 437         cwd = xgetcwd();
 438         cwd_is_git_dir = !strcmp(git_dir, cwd);
 439         free(cwd);
 440         if (cwd_is_git_dir)
 441                 return 1;
 442         /*
 443          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 444          */
 445         if (!strcmp(git_dir, ".git"))
 446                 return 0;
 447         slash = strrchr(git_dir, '/');
 448         if (slash && !strcmp(slash, "/.git"))
 449                 return 0;
 450
 451         /*
 452          * Otherwise it is often bare.  At this point
 453          * we are just guessing.
 454          */
 455         return 1;
 456 }
 457
 458 static int shared_callback(const struct option *opt, const char *arg, int unset)
 459 {
 460         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 461         return 0;
 462 }
 463
 464 static const char *const init_db_usage[] = {
 465         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 466         NULL
 467 };
 468
 469 /*
 470  * If you want to, you can share the DB area with any number of branches.
 471  * That has advantages: you can save space by sharing all the SHA1 objects.
 472  * On the other hand, it might just make lookup slower and messier. You
 473  * be the judge.  The default case is to have one DB per managed directory.
 474  */
 475 int cmd_init_db(int argc, const char **argv, const char *prefix)
 476 {
 477         const char *git_dir;
 478         const char *real_git_dir = NULL;
 479         const char *work_tree;
 480         const char *template_dir = NULL;
 481         unsigned int flags = 0;
 482         const struct option init_db_options[] = {
 483                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 484                                 N_("directory from which templates will be used")),
 485                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 486                                 N_("create a bare repository"), 1),
 487                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 488                         N_("permissions"),
 489                         N_("specify that the git repository is to be shared amongst several users"),
 490                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 491                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 492                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 493                            N_("separate git dir from working tree")),
 494                 OPT_END()
 495         };
 496
 497         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 498
 499         if (real_git_dir && !is_absolute_path(real_git_dir))
 500                 real_git_dir = xstrdup(real_path(real_git_dir));
 501
 502         if (argc == 1) {
 503                 int mkdir_tried = 0;
 504         retry:
 505                 if (chdir(argv[0]) < 0) {
 506                         if (!mkdir_tried) {
 507                                 int saved;
 508                                 /*
 509                                  * At this point we haven't read any configuration,
 510                                  * and we know shared_repository should always be 0;
 511                                  * but just in case we play safe.
 512                                  */
 513                                 saved = get_shared_repository();
 514                                 set_shared_repository(0);
 515                                 switch (safe_create_leading_directories_const(argv[0])) {
 516                                 case SCLD_OK:
 517                                 case SCLD_PERMS:
 518                                         break;
 519                                 case SCLD_EXISTS:
 520                                         errno = EEXIST;
 521                                         /* fallthru */
 522                                 default:
 523                                         die_errno(_("cannot mkdir %s"), argv[0]);
 524                                         break;
 525                                 }
 526                                 set_shared_repository(saved);
 527                                 if (mkdir(argv[0], 0777) < 0)
 528                                         die_errno(_("cannot mkdir %s"), argv[0]);
 529                                 mkdir_tried = 1;
 530                                 goto retry;
 531                         }
 532                         die_errno(_("cannot chdir to %s"), argv[0]);
 533                 }
 534         } else if (0 < argc) {
 535                 usage(init_db_usage[0]);
 536         }
 537         if (is_bare_repository_cfg == 1) {
 538                 char *cwd = xgetcwd();
 539                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 540                 free(cwd);
 541         }
 542
 543         if (init_shared_repository != -1)
 544                 set_shared_repository(init_shared_repository);
 545
 546         /*
 547          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 548          * without --bare.  Catch the error early.
 549          */
 550         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 551         work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 552         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 553                 die(_("%s (or --work-tree=<directory>) not allowed without "
 554                           "specifying %s (or --git-dir=<directory>)"),
 555                     GIT_WORK_TREE_ENVIRONMENT,
 556                     GIT_DIR_ENVIRONMENT);
 557
 558         /*
 559          * Set up the default .git directory contents
 560          */
 561         if (!git_dir)
 562                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 563
 564         if (is_bare_repository_cfg < 0)
 565                 is_bare_repository_cfg = guess_repository_type(git_dir);
 566
 567         if (!is_bare_repository_cfg) {
 568                 const char *git_dir_parent = strrchr(git_dir, '/');
 569                 if (git_dir_parent) {
 570                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 571                         git_work_tree_cfg = xstrdup(real_path(rel));
 572                         free(rel);
 573                 }
 574                 if (!git_work_tree_cfg)
 575                         git_work_tree_cfg = xgetcwd();
 576                 if (work_tree)
 577                         set_git_work_tree(work_tree);
 578                 else
 579                         set_git_work_tree(git_work_tree_cfg);
 580                 if (access(get_git_work_tree(), X_OK))
 581                         die_errno (_("Cannot access work tree '%s'"),
 582                                    get_git_work_tree());
 583         }
 584         else {
 585                 if (work_tree)
 586                         set_git_work_tree(work_tree);
 587         }
 588
 589         set_git_dir_init(git_dir, real_git_dir, 1);
 590
 591         return init_db(template_dir, flags);
 592 }