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