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 safe_create_dir(const char *dir, int share)
  28 {
  29         if (mkdir(dir, 0777) < 0) {
  30                 if (errno != EEXIST) {
  31                         perror(dir);
  32                         exit(1);
  33                 }
  34         }
  35         else if (share && adjust_shared_perm(dir))
  36                 die(_("Could not make %s writable by group"), dir);
  37 }
  38
  39 static void copy_templates_1(char *path, int baselen,
  40                              char *template, int template_baselen,
  41                              DIR *dir)
  42 {
  43         struct dirent *de;
  44
  45         /* Note: if ".git/hooks" file exists in the repository being
  46          * re-initialized, /etc/core-git/templates/hooks/update would
  47          * cause "git init" to fail here.  I think this is sane but
  48          * it means that the set of templates we ship by default, along
  49          * with the way the namespace under .git/ is organized, should
  50          * be really carefully chosen.
  51          */
  52         safe_create_dir(path, 1);
  53         while ((de = readdir(dir)) != NULL) {
  54                 struct stat st_git, st_template;
  55                 int namelen;
  56                 int exists = 0;
  57
  58                 if (de->d_name[0] == '.')
  59                         continue;
  60                 namelen = strlen(de->d_name);
  61                 if ((PATH_MAX <= baselen + namelen) ||
  62                     (PATH_MAX <= template_baselen + namelen))
  63                         die(_("insanely long template name %s"), de->d_name);
  64                 memcpy(path + baselen, de->d_name, namelen+1);
  65                 memcpy(template + template_baselen, de->d_name, namelen+1);
  66                 if (lstat(path, &st_git)) {
  67                         if (errno != ENOENT)
  68                                 die_errno(_("cannot stat '%s'"), path);
  69                 }
  70                 else
  71                         exists = 1;
  72
  73                 if (lstat(template, &st_template))
  74                         die_errno(_("cannot stat template '%s'"), template);
  75
  76                 if (S_ISDIR(st_template.st_mode)) {
  77                         DIR *subdir = opendir(template);
  78                         int baselen_sub = baselen + namelen;
  79                         int template_baselen_sub = template_baselen + namelen;
  80                         if (!subdir)
  81                                 die_errno(_("cannot opendir '%s'"), template);
  82                         path[baselen_sub++] =
  83                                 template[template_baselen_sub++] = '/';
  84                         path[baselen_sub] =
  85                                 template[template_baselen_sub] = 0;
  86                         copy_templates_1(path, baselen_sub,
  87                                          template, template_baselen_sub,
  88                                          subdir);
  89                         closedir(subdir);
  90                 }
  91                 else if (exists)
  92                         continue;
  93                 else if (S_ISLNK(st_template.st_mode)) {
  94                         char lnk[256];
  95                         int len;
  96                         len = readlink(template, lnk, sizeof(lnk));
  97                         if (len < 0)
  98                                 die_errno(_("cannot readlink '%s'"), template);
  99                         if (sizeof(lnk) <= len)
 100                                 die(_("insanely long symlink %s"), template);
 101                         lnk[len] = 0;
 102                         if (symlink(lnk, path))
 103                                 die_errno(_("cannot symlink '%s' '%s'"), lnk, path);
 104                 }
 105                 else if (S_ISREG(st_template.st_mode)) {
 106                         if (copy_file(path, template, st_template.st_mode))
 107                                 die_errno(_("cannot copy '%s' to '%s'"), template,
 108                                           path);
 109                 }
 110                 else
 111                         error(_("ignoring template %s"), template);
 112         }
 113 }
 114
 115 static void copy_templates(const char *template_dir)
 116 {
 117         char path[PATH_MAX];
 118         char template_path[PATH_MAX];
 119         int template_len;
 120         DIR *dir;
 121         const char *git_dir = get_git_dir();
 122         int len = strlen(git_dir);
 123         char *to_free = NULL;
 124
 125         if (!template_dir)
 126                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 127         if (!template_dir)
 128                 template_dir = init_db_template_dir;
 129         if (!template_dir)
 130                 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 131         if (!template_dir[0]) {
 132                 free(to_free);
 133                 return;
 134         }
 135         template_len = strlen(template_dir);
 136         if (PATH_MAX <= (template_len+strlen("/config")))
 137                 die(_("insanely long template path %s"), template_dir);
 138         strcpy(template_path, template_dir);
 139         if (template_path[template_len-1] != '/') {
 140                 template_path[template_len++] = '/';
 141                 template_path[template_len] = 0;
 142         }
 143         dir = opendir(template_path);
 144         if (!dir) {
 145                 warning(_("templates not found %s"), template_dir);
 146                 goto free_return;
 147         }
 148
 149         /* Make sure that template is from the correct vintage */
 150         strcpy(template_path + template_len, "config");
 151         repository_format_version = 0;
 152         git_config_from_file(check_repository_format_version,
 153                              template_path, NULL);
 154         template_path[template_len] = 0;
 155
 156         if (repository_format_version &&
 157             repository_format_version != GIT_REPO_VERSION) {
 158                 warning(_("not copying templates of "
 159                         "a wrong format version %d from '%s'"),
 160                         repository_format_version,
 161                         template_dir);
 162                 goto close_free_return;
 163         }
 164
 165         memcpy(path, git_dir, len);
 166         if (len && path[len - 1] != '/')
 167                 path[len++] = '/';
 168         path[len] = 0;
 169         copy_templates_1(path, len,
 170                          template_path, template_len,
 171                          dir);
 172 close_free_return:
 173         closedir(dir);
 174 free_return:
 175         free(to_free);
 176 }
 177
 178 static int git_init_db_config(const char *k, const char *v, void *cb)
 179 {
 180         if (!strcmp(k, "init.templatedir"))
 181                 return git_config_pathname(&init_db_template_dir, k, v);
 182
 183         return 0;
 184 }
 185
 186 /*
 187  * If the git_dir is not directly inside the working tree, then git will not
 188  * find it by default, and we need to set the worktree explicitly.
 189  */
 190 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
 191 {
 192         if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
 193                 return 0;
 194         if (skip_prefix(git_dir, work_tree, &git_dir) &&
 195             !strcmp(git_dir, "/.git"))
 196                 return 0;
 197         return 1;
 198 }
 199
 200 static int create_default_files(const char *template_path)
 201 {
 202         const char *git_dir = get_git_dir();
 203         unsigned len = strlen(git_dir);
 204         static char path[PATH_MAX];
 205         struct stat st1;
 206         char repo_version_string[10];
 207         char junk[2];
 208         int reinit;
 209         int filemode;
 210
 211         if (len > sizeof(path)-50)
 212                 die(_("insane git directory %s"), git_dir);
 213         memcpy(path, git_dir, len);
 214
 215         if (len && path[len-1] != '/')
 216                 path[len++] = '/';
 217
 218         /*
 219          * Create .git/refs/{heads,tags}
 220          */
 221         safe_create_dir(git_path("refs"), 1);
 222         safe_create_dir(git_path("refs/heads"), 1);
 223         safe_create_dir(git_path("refs/tags"), 1);
 224
 225         /* Just look for `init.templatedir` */
 226         git_config(git_init_db_config, NULL);
 227
 228         /* First copy the templates -- we might have the default
 229          * config file there, in which case we would want to read
 230          * from it after installing.
 231          */
 232         copy_templates(template_path);
 233
 234         git_config(git_default_config, NULL);
 235         is_bare_repository_cfg = init_is_bare_repository;
 236
 237         /* reading existing config may have overwrote it */
 238         if (init_shared_repository != -1)
 239                 shared_repository = init_shared_repository;
 240
 241         /*
 242          * We would have created the above under user's umask -- under
 243          * shared-repository settings, we would need to fix them up.
 244          */
 245         if (shared_repository) {
 246                 adjust_shared_perm(get_git_dir());
 247                 adjust_shared_perm(git_path("refs"));
 248                 adjust_shared_perm(git_path("refs/heads"));
 249                 adjust_shared_perm(git_path("refs/tags"));
 250         }
 251
 252         /*
 253          * Create the default symlink from ".git/HEAD" to the "master"
 254          * branch, if it does not exist yet.
 255          */
 256         strcpy(path + len, "HEAD");
 257         reinit = (!access(path, R_OK)
 258                   || readlink(path, junk, sizeof(junk)-1) != -1);
 259         if (!reinit) {
 260                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 261                         exit(1);
 262         }
 263
 264         /* This forces creation of new config file */
 265         xsnprintf(repo_version_string, sizeof(repo_version_string),
 266                   "%d", GIT_REPO_VERSION);
 267         git_config_set("core.repositoryformatversion", repo_version_string);
 268
 269         path[len] = 0;
 270         strcpy(path + len, "config");
 271
 272         /* Check filemode trustability */
 273         filemode = TEST_FILEMODE;
 274         if (TEST_FILEMODE && !lstat(path, &st1)) {
 275                 struct stat st2;
 276                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 277                                 !lstat(path, &st2) &&
 278                                 st1.st_mode != st2.st_mode &&
 279                                 !chmod(path, st1.st_mode));
 280                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 281                         filemode = 0;
 282         }
 283         git_config_set("core.filemode", filemode ? "true" : "false");
 284
 285         if (is_bare_repository())
 286                 git_config_set("core.bare", "true");
 287         else {
 288                 const char *work_tree = get_git_work_tree();
 289                 git_config_set("core.bare", "false");
 290                 /* allow template config file to override the default */
 291                 if (log_all_ref_updates == -1)
 292                     git_config_set("core.logallrefupdates", "true");
 293                 if (needs_work_tree_config(git_dir, work_tree))
 294                         git_config_set("core.worktree", work_tree);
 295         }
 296
 297         if (!reinit) {
 298                 /* Check if symlink is supported in the work tree */
 299                 path[len] = 0;
 300                 strcpy(path + len, "tXXXXXX");
 301                 if (!close(xmkstemp(path)) &&
 302                     !unlink(path) &&
 303                     !symlink("testing", path) &&
 304                     !lstat(path, &st1) &&
 305                     S_ISLNK(st1.st_mode))
 306                         unlink(path); /* good */
 307                 else
 308                         git_config_set("core.symlinks", "false");
 309
 310                 /* Check if the filesystem is case-insensitive */
 311                 path[len] = 0;
 312                 strcpy(path + len, "CoNfIg");
 313                 if (!access(path, F_OK))
 314                         git_config_set("core.ignorecase", "true");
 315                 probe_utf8_pathname_composition(path, len);
 316         }
 317
 318         return reinit;
 319 }
 320
 321 static void create_object_directory(void)
 322 {
 323         const char *object_directory = get_object_directory();
 324         int len = strlen(object_directory);
 325         char *path = xmalloc(len + 40);
 326
 327         memcpy(path, object_directory, len);
 328
 329         safe_create_dir(object_directory, 1);
 330         strcpy(path+len, "/pack");
 331         safe_create_dir(path, 1);
 332         strcpy(path+len, "/info");
 333         safe_create_dir(path, 1);
 334
 335         free(path);
 336 }
 337
 338 int set_git_dir_init(const char *git_dir, const char *real_git_dir,
 339                      int exist_ok)
 340 {
 341         if (real_git_dir) {
 342                 struct stat st;
 343
 344                 if (!exist_ok && !stat(git_dir, &st))
 345                         die(_("%s already exists"), git_dir);
 346
 347                 if (!exist_ok && !stat(real_git_dir, &st))
 348                         die(_("%s already exists"), real_git_dir);
 349
 350                 /*
 351                  * make sure symlinks are resolved because we'll be
 352                  * moving the target repo later on in separate_git_dir()
 353                  */
 354                 git_link = xstrdup(real_path(git_dir));
 355                 set_git_dir(real_path(real_git_dir));
 356         }
 357         else {
 358                 set_git_dir(real_path(git_dir));
 359                 git_link = NULL;
 360         }
 361         return 0;
 362 }
 363
 364 static void separate_git_dir(const char *git_dir)
 365 {
 366         struct stat st;
 367
 368         if (!stat(git_link, &st)) {
 369                 const char *src;
 370
 371                 if (S_ISREG(st.st_mode))
 372                         src = read_gitfile(git_link);
 373                 else if (S_ISDIR(st.st_mode))
 374                         src = git_link;
 375                 else
 376                         die(_("unable to handle file type %d"), (int)st.st_mode);
 377
 378                 if (rename(src, git_dir))
 379                         die_errno(_("unable to move %s to %s"), src, git_dir);
 380         }
 381
 382         write_file(git_link, "gitdir: %s", git_dir);
 383 }
 384
 385 int init_db(const char *template_dir, unsigned int flags)
 386 {
 387         int reinit;
 388         const char *git_dir = get_git_dir();
 389
 390         if (git_link)
 391                 separate_git_dir(git_dir);
 392
 393         safe_create_dir(git_dir, 0);
 394
 395         init_is_bare_repository = is_bare_repository();
 396
 397         /* Check to see if the repository version is right.
 398          * Note that a newly created repository does not have
 399          * config file, so this will not fail.  What we are catching
 400          * is an attempt to reinitialize new repository with an old tool.
 401          */
 402         check_repository_format();
 403
 404         reinit = create_default_files(template_dir);
 405
 406         create_object_directory();
 407
 408         if (shared_repository) {
 409                 char buf[10];
 410                 /* We do not spell "group" and such, so that
 411                  * the configuration can be read by older version
 412                  * of git. Note, we use octal numbers for new share modes,
 413                  * and compatibility values for PERM_GROUP and
 414                  * PERM_EVERYBODY.
 415                  */
 416                 if (shared_repository < 0)
 417                         /* force to the mode value */
 418                         xsnprintf(buf, sizeof(buf), "0%o", -shared_repository);
 419                 else if (shared_repository == PERM_GROUP)
 420                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
 421                 else if (shared_repository == PERM_EVERYBODY)
 422                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
 423                 else
 424                         die("BUG: invalid value for shared_repository");
 425                 git_config_set("core.sharedrepository", buf);
 426                 git_config_set("receive.denyNonFastforwards", "true");
 427         }
 428
 429         if (!(flags & INIT_DB_QUIET)) {
 430                 int len = strlen(git_dir);
 431
 432                 /* TRANSLATORS: The first '%s' is either "Reinitialized
 433                    existing" or "Initialized empty", the second " shared" or
 434                    "", and the last '%s%s' is the verbatim directory name. */
 435                 printf(_("%s%s Git repository in %s%s\n"),
 436                        reinit ? _("Reinitialized existing") : _("Initialized empty"),
 437                        shared_repository ? _(" shared") : "",
 438                        git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 439         }
 440
 441         return 0;
 442 }
 443
 444 static int guess_repository_type(const char *git_dir)
 445 {
 446         const char *slash;
 447         char *cwd;
 448         int cwd_is_git_dir;
 449
 450         /*
 451          * "GIT_DIR=. git init" is always bare.
 452          * "GIT_DIR=`pwd` git init" too.
 453          */
 454         if (!strcmp(".", git_dir))
 455                 return 1;
 456         cwd = xgetcwd();
 457         cwd_is_git_dir = !strcmp(git_dir, cwd);
 458         free(cwd);
 459         if (cwd_is_git_dir)
 460                 return 1;
 461         /*
 462          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 463          */
 464         if (!strcmp(git_dir, ".git"))
 465                 return 0;
 466         slash = strrchr(git_dir, '/');
 467         if (slash && !strcmp(slash, "/.git"))
 468                 return 0;
 469
 470         /*
 471          * Otherwise it is often bare.  At this point
 472          * we are just guessing.
 473          */
 474         return 1;
 475 }
 476
 477 static int shared_callback(const struct option *opt, const char *arg, int unset)
 478 {
 479         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 480         return 0;
 481 }
 482
 483 static const char *const init_db_usage[] = {
 484         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 485         NULL
 486 };
 487
 488 /*
 489  * If you want to, you can share the DB area with any number of branches.
 490  * That has advantages: you can save space by sharing all the SHA1 objects.
 491  * On the other hand, it might just make lookup slower and messier. You
 492  * be the judge.  The default case is to have one DB per managed directory.
 493  */
 494 int cmd_init_db(int argc, const char **argv, const char *prefix)
 495 {
 496         const char *git_dir;
 497         const char *real_git_dir = NULL;
 498         const char *work_tree;
 499         const char *template_dir = NULL;
 500         unsigned int flags = 0;
 501         const struct option init_db_options[] = {
 502                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 503                                 N_("directory from which templates will be used")),
 504                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 505                                 N_("create a bare repository"), 1),
 506                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 507                         N_("permissions"),
 508                         N_("specify that the git repository is to be shared amongst several users"),
 509                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 510                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 511                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 512                            N_("separate git dir from working tree")),
 513                 OPT_END()
 514         };
 515
 516         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 517
 518         if (real_git_dir && !is_absolute_path(real_git_dir))
 519                 real_git_dir = xstrdup(real_path(real_git_dir));
 520
 521         if (argc == 1) {
 522                 int mkdir_tried = 0;
 523         retry:
 524                 if (chdir(argv[0]) < 0) {
 525                         if (!mkdir_tried) {
 526                                 int saved;
 527                                 /*
 528                                  * At this point we haven't read any configuration,
 529                                  * and we know shared_repository should always be 0;
 530                                  * but just in case we play safe.
 531                                  */
 532                                 saved = shared_repository;
 533                                 shared_repository = 0;
 534                                 switch (safe_create_leading_directories_const(argv[0])) {
 535                                 case SCLD_OK:
 536                                 case SCLD_PERMS:
 537                                         break;
 538                                 case SCLD_EXISTS:
 539                                         errno = EEXIST;
 540                                         /* fallthru */
 541                                 default:
 542                                         die_errno(_("cannot mkdir %s"), argv[0]);
 543                                         break;
 544                                 }
 545                                 shared_repository = saved;
 546                                 if (mkdir(argv[0], 0777) < 0)
 547                                         die_errno(_("cannot mkdir %s"), argv[0]);
 548                                 mkdir_tried = 1;
 549                                 goto retry;
 550                         }
 551                         die_errno(_("cannot chdir to %s"), argv[0]);
 552                 }
 553         } else if (0 < argc) {
 554                 usage(init_db_usage[0]);
 555         }
 556         if (is_bare_repository_cfg == 1) {
 557                 char *cwd = xgetcwd();
 558                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 559                 free(cwd);
 560         }
 561
 562         if (init_shared_repository != -1)
 563                 shared_repository = init_shared_repository;
 564
 565         /*
 566          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 567          * without --bare.  Catch the error early.
 568          */
 569         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 570         work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 571         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 572                 die(_("%s (or --work-tree=<directory>) not allowed without "
 573                           "specifying %s (or --git-dir=<directory>)"),
 574                     GIT_WORK_TREE_ENVIRONMENT,
 575                     GIT_DIR_ENVIRONMENT);
 576
 577         /*
 578          * Set up the default .git directory contents
 579          */
 580         if (!git_dir)
 581                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 582
 583         if (is_bare_repository_cfg < 0)
 584                 is_bare_repository_cfg = guess_repository_type(git_dir);
 585
 586         if (!is_bare_repository_cfg) {
 587                 const char *git_dir_parent = strrchr(git_dir, '/');
 588                 if (git_dir_parent) {
 589                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 590                         git_work_tree_cfg = xstrdup(real_path(rel));
 591                         free(rel);
 592                 }
 593                 if (!git_work_tree_cfg)
 594                         git_work_tree_cfg = xgetcwd();
 595                 if (work_tree)
 596                         set_git_work_tree(work_tree);
 597                 else
 598                         set_git_work_tree(git_work_tree_cfg);
 599                 if (access(get_git_work_tree(), X_OK))
 600                         die_errno (_("Cannot access work tree '%s'"),
 601                                    get_git_work_tree());
 602         }
 603         else {
 604                 if (work_tree)
 605                         set_git_work_tree(work_tree);
 606         }
 607
 608         set_git_dir_init(git_dir, real_git_dir, 1);
 609
 610         return init_db(template_dir, flags);
 611 }