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 "builtin.h"
   8 #include "exec_cmd.h"
   9 #include "parse-options.h"
  10
  11 #ifndef DEFAULT_GIT_TEMPLATE_DIR
  12 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
  13 #endif
  14
  15 #ifdef NO_TRUSTABLE_FILEMODE
  16 #define TEST_FILEMODE 0
  17 #else
  18 #define TEST_FILEMODE 1
  19 #endif
  20
  21 static int init_is_bare_repository = 0;
  22 static int init_shared_repository = -1;
  23 static const char *init_db_template_dir;
  24 static const char *git_link;
  25
  26 static void safe_create_dir(const char *dir, int share)
  27 {
  28         if (mkdir(dir, 0777) < 0) {
  29                 if (errno != EEXIST) {
  30                         perror(dir);
  31                         exit(1);
  32                 }
  33         }
  34         else if (share && adjust_shared_perm(dir))
  35                 die(_("Could not make %s writable by group"), dir);
  36 }
  37
  38 static void copy_templates_1(char *path, int baselen,
  39                              char *template, int template_baselen,
  40                              DIR *dir)
  41 {
  42         struct dirent *de;
  43
  44         /* Note: if ".git/hooks" file exists in the repository being
  45          * re-initialized, /etc/core-git/templates/hooks/update would
  46          * cause "git init" to fail here.  I think this is sane but
  47          * it means that the set of templates we ship by default, along
  48          * with the way the namespace under .git/ is organized, should
  49          * be really carefully chosen.
  50          */
  51         safe_create_dir(path, 1);
  52         while ((de = readdir(dir)) != NULL) {
  53                 struct stat st_git, st_template;
  54                 int namelen;
  55                 int exists = 0;
  56
  57                 if (de->d_name[0] == '.')
  58                         continue;
  59                 namelen = strlen(de->d_name);
  60                 if ((PATH_MAX <= baselen + namelen) ||
  61                     (PATH_MAX <= template_baselen + namelen))
  62                         die(_("insanely long template name %s"), de->d_name);
  63                 memcpy(path + baselen, de->d_name, namelen+1);
  64                 memcpy(template + template_baselen, de->d_name, namelen+1);
  65                 if (lstat(path, &st_git)) {
  66                         if (errno != ENOENT)
  67                                 die_errno(_("cannot stat '%s'"), path);
  68                 }
  69                 else
  70                         exists = 1;
  71
  72                 if (lstat(template, &st_template))
  73                         die_errno(_("cannot stat template '%s'"), template);
  74
  75                 if (S_ISDIR(st_template.st_mode)) {
  76                         DIR *subdir = opendir(template);
  77                         int baselen_sub = baselen + namelen;
  78                         int template_baselen_sub = template_baselen + namelen;
  79                         if (!subdir)
  80                                 die_errno(_("cannot opendir '%s'"), template);
  81                         path[baselen_sub++] =
  82                                 template[template_baselen_sub++] = '/';
  83                         path[baselen_sub] =
  84                                 template[template_baselen_sub] = 0;
  85                         copy_templates_1(path, baselen_sub,
  86                                          template, template_baselen_sub,
  87                                          subdir);
  88                         closedir(subdir);
  89                 }
  90                 else if (exists)
  91                         continue;
  92                 else if (S_ISLNK(st_template.st_mode)) {
  93                         char lnk[256];
  94                         int len;
  95                         len = readlink(template, lnk, sizeof(lnk));
  96                         if (len < 0)
  97                                 die_errno(_("cannot readlink '%s'"), template);
  98                         if (sizeof(lnk) <= len)
  99                                 die(_("insanely long symlink %s"), template);
 100                         lnk[len] = 0;
 101                         if (symlink(lnk, path))
 102                                 die_errno(_("cannot symlink '%s' '%s'"), lnk, path);
 103                 }
 104                 else if (S_ISREG(st_template.st_mode)) {
 105                         if (copy_file(path, template, st_template.st_mode))
 106                                 die_errno(_("cannot copy '%s' to '%s'"), template,
 107                                           path);
 108                 }
 109                 else
 110                         error(_("ignoring template %s"), template);
 111         }
 112 }
 113
 114 static void copy_templates(const char *template_dir)
 115 {
 116         char path[PATH_MAX];
 117         char template_path[PATH_MAX];
 118         int template_len;
 119         DIR *dir;
 120         const char *git_dir = get_git_dir();
 121         int len = strlen(git_dir);
 122         char *to_free = NULL;
 123
 124         if (!template_dir)
 125                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 126         if (!template_dir)
 127                 template_dir = init_db_template_dir;
 128         if (!template_dir)
 129                 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 130         if (!template_dir[0]) {
 131                 free(to_free);
 132                 return;
 133         }
 134         template_len = strlen(template_dir);
 135         if (PATH_MAX <= (template_len+strlen("/config")))
 136                 die(_("insanely long template path %s"), template_dir);
 137         strcpy(template_path, template_dir);
 138         if (template_path[template_len-1] != '/') {
 139                 template_path[template_len++] = '/';
 140                 template_path[template_len] = 0;
 141         }
 142         dir = opendir(template_path);
 143         if (!dir) {
 144                 warning(_("templates not found %s"), template_dir);
 145                 goto free_return;
 146         }
 147
 148         /* Make sure that template is from the correct vintage */
 149         strcpy(template_path + template_len, "config");
 150         repository_format_version = 0;
 151         git_config_from_file(check_repository_format_version,
 152                              template_path, NULL);
 153         template_path[template_len] = 0;
 154
 155         if (repository_format_version &&
 156             repository_format_version != GIT_REPO_VERSION) {
 157                 warning(_("not copying templates of "
 158                         "a wrong format version %d from '%s'"),
 159                         repository_format_version,
 160                         template_dir);
 161                 goto close_free_return;
 162         }
 163
 164         memcpy(path, git_dir, len);
 165         if (len && path[len - 1] != '/')
 166                 path[len++] = '/';
 167         path[len] = 0;
 168         copy_templates_1(path, len,
 169                          template_path, template_len,
 170                          dir);
 171 close_free_return:
 172         closedir(dir);
 173 free_return:
 174         free(to_free);
 175 }
 176
 177 static int git_init_db_config(const char *k, const char *v, void *cb)
 178 {
 179         if (!strcmp(k, "init.templatedir"))
 180                 return git_config_pathname(&init_db_template_dir, k, v);
 181
 182         return 0;
 183 }
 184
 185 /*
 186  * If the git_dir is not directly inside the working tree, then git will not
 187  * find it by default, and we need to set the worktree explicitly.
 188  */
 189 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
 190 {
 191         if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
 192                 return 0;
 193         if (skip_prefix(git_dir, work_tree, &git_dir) &&
 194             !strcmp(git_dir, "/.git"))
 195                 return 0;
 196         return 1;
 197 }
 198
 199 static int create_default_files(const char *template_path)
 200 {
 201         const char *git_dir = get_git_dir();
 202         unsigned len = strlen(git_dir);
 203         static char path[PATH_MAX];
 204         struct stat st1;
 205         char repo_version_string[10];
 206         char junk[2];
 207         int reinit;
 208         int filemode;
 209
 210         if (len > sizeof(path)-50)
 211                 die(_("insane git directory %s"), git_dir);
 212         memcpy(path, git_dir, len);
 213
 214         if (len && path[len-1] != '/')
 215                 path[len++] = '/';
 216
 217         /*
 218          * Create .git/refs/{heads,tags}
 219          */
 220         safe_create_dir(git_path("refs"), 1);
 221         safe_create_dir(git_path("refs/heads"), 1);
 222         safe_create_dir(git_path("refs/tags"), 1);
 223
 224         /* Just look for `init.templatedir` */
 225         git_config(git_init_db_config, NULL);
 226
 227         /* First copy the templates -- we might have the default
 228          * config file there, in which case we would want to read
 229          * from it after installing.
 230          */
 231         copy_templates(template_path);
 232
 233         git_config(git_default_config, NULL);
 234         is_bare_repository_cfg = init_is_bare_repository;
 235
 236         /* reading existing config may have overwrote it */
 237         if (init_shared_repository != -1)
 238                 shared_repository = init_shared_repository;
 239
 240         /*
 241          * We would have created the above under user's umask -- under
 242          * shared-repository settings, we would need to fix them up.
 243          */
 244         if (shared_repository) {
 245                 adjust_shared_perm(get_git_dir());
 246                 adjust_shared_perm(git_path("refs"));
 247                 adjust_shared_perm(git_path("refs/heads"));
 248                 adjust_shared_perm(git_path("refs/tags"));
 249         }
 250
 251         /*
 252          * Create the default symlink from ".git/HEAD" to the "master"
 253          * branch, if it does not exist yet.
 254          */
 255         strcpy(path + len, "HEAD");
 256         reinit = (!access(path, R_OK)
 257                   || readlink(path, junk, sizeof(junk)-1) != -1);
 258         if (!reinit) {
 259                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 260                         exit(1);
 261         }
 262
 263         /* This forces creation of new config file */
 264         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 265         git_config_set("core.repositoryformatversion", repo_version_string);
 266
 267         path[len] = 0;
 268         strcpy(path + len, "config");
 269
 270         /* Check filemode trustability */
 271         filemode = TEST_FILEMODE;
 272         if (TEST_FILEMODE && !lstat(path, &st1)) {
 273                 struct stat st2;
 274                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 275                                 !lstat(path, &st2) &&
 276                                 st1.st_mode != st2.st_mode &&
 277                                 !chmod(path, st1.st_mode));
 278                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
 279                         filemode = 0;
 280         }
 281         git_config_set("core.filemode", filemode ? "true" : "false");
 282
 283         if (is_bare_repository())
 284                 git_config_set("core.bare", "true");
 285         else {
 286                 const char *work_tree = get_git_work_tree();
 287                 git_config_set("core.bare", "false");
 288                 /* allow template config file to override the default */
 289                 if (log_all_ref_updates == -1)
 290                     git_config_set("core.logallrefupdates", "true");
 291                 if (needs_work_tree_config(git_dir, work_tree))
 292                         git_config_set("core.worktree", work_tree);
 293         }
 294
 295         if (!reinit) {
 296                 /* Check if symlink is supported in the work tree */
 297                 path[len] = 0;
 298                 strcpy(path + len, "tXXXXXX");
 299                 if (!close(xmkstemp(path)) &&
 300                     !unlink(path) &&
 301                     !symlink("testing", path) &&
 302                     !lstat(path, &st1) &&
 303                     S_ISLNK(st1.st_mode))
 304                         unlink(path); /* good */
 305                 else
 306                         git_config_set("core.symlinks", "false");
 307
 308                 /* Check if the filesystem is case-insensitive */
 309                 path[len] = 0;
 310                 strcpy(path + len, "CoNfIg");
 311                 if (!access(path, F_OK))
 312                         git_config_set("core.ignorecase", "true");
 313                 probe_utf8_pathname_composition(path, len);
 314         }
 315
 316         return reinit;
 317 }
 318
 319 static void create_object_directory(void)
 320 {
 321         const char *object_directory = get_object_directory();
 322         int len = strlen(object_directory);
 323         char *path = xmalloc(len + 40);
 324
 325         memcpy(path, object_directory, len);
 326
 327         safe_create_dir(object_directory, 1);
 328         strcpy(path+len, "/pack");
 329         safe_create_dir(path, 1);
 330         strcpy(path+len, "/info");
 331         safe_create_dir(path, 1);
 332
 333         free(path);
 334 }
 335
 336 int set_git_dir_init(const char *git_dir, const char *real_git_dir,
 337                      int exist_ok)
 338 {
 339         if (real_git_dir) {
 340                 struct stat st;
 341
 342                 if (!exist_ok && !stat(git_dir, &st))
 343                         die(_("%s already exists"), git_dir);
 344
 345                 if (!exist_ok && !stat(real_git_dir, &st))
 346                         die(_("%s already exists"), real_git_dir);
 347
 348                 /*
 349                  * make sure symlinks are resolved because we'll be
 350                  * moving the target repo later on in separate_git_dir()
 351                  */
 352                 git_link = xstrdup(real_path(git_dir));
 353                 set_git_dir(real_path(real_git_dir));
 354         }
 355         else {
 356                 set_git_dir(real_path(git_dir));
 357                 git_link = NULL;
 358         }
 359         return 0;
 360 }
 361
 362 static void separate_git_dir(const char *git_dir)
 363 {
 364         struct stat st;
 365         FILE *fp;
 366
 367         if (!stat(git_link, &st)) {
 368                 const char *src;
 369
 370                 if (S_ISREG(st.st_mode))
 371                         src = read_gitfile(git_link);
 372                 else if (S_ISDIR(st.st_mode))
 373                         src = git_link;
 374                 else
 375                         die(_("unable to handle file type %d"), (int)st.st_mode);
 376
 377                 if (rename(src, git_dir))
 378                         die_errno(_("unable to move %s to %s"), src, git_dir);
 379         }
 380
 381         fp = fopen(git_link, "w");
 382         if (!fp)
 383                 die(_("Could not create git link %s"), git_link);
 384         fprintf(fp, "gitdir: %s\n", git_dir);
 385         fclose(fp);
 386 }
 387
 388 int init_db(const char *template_dir, unsigned int flags)
 389 {
 390         int reinit;
 391         const char *git_dir = get_git_dir();
 392
 393         if (git_link)
 394                 separate_git_dir(git_dir);
 395
 396         safe_create_dir(git_dir, 0);
 397
 398         init_is_bare_repository = is_bare_repository();
 399
 400         /* Check to see if the repository version is right.
 401          * Note that a newly created repository does not have
 402          * config file, so this will not fail.  What we are catching
 403          * is an attempt to reinitialize new repository with an old tool.
 404          */
 405         check_repository_format();
 406
 407         reinit = create_default_files(template_dir);
 408
 409         create_object_directory();
 410
 411         if (shared_repository) {
 412                 char buf[10];
 413                 /* We do not spell "group" and such, so that
 414                  * the configuration can be read by older version
 415                  * of git. Note, we use octal numbers for new share modes,
 416                  * and compatibility values for PERM_GROUP and
 417                  * PERM_EVERYBODY.
 418                  */
 419                 if (shared_repository < 0)
 420                         /* force to the mode value */
 421                         sprintf(buf, "0%o", -shared_repository);
 422                 else if (shared_repository == PERM_GROUP)
 423                         sprintf(buf, "%d", OLD_PERM_GROUP);
 424                 else if (shared_repository == PERM_EVERYBODY)
 425                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
 426                 else
 427                         die("oops");
 428                 git_config_set("core.sharedrepository", buf);
 429                 git_config_set("receive.denyNonFastforwards", "true");
 430         }
 431
 432         if (!(flags & INIT_DB_QUIET)) {
 433                 int len = strlen(git_dir);
 434
 435                 /* TRANSLATORS: The first '%s' is either "Reinitialized
 436                    existing" or "Initialized empty", the second " shared" or
 437                    "", and the last '%s%s' is the verbatim directory name. */
 438                 printf(_("%s%s Git repository in %s%s\n"),
 439                        reinit ? _("Reinitialized existing") : _("Initialized empty"),
 440                        shared_repository ? _(" shared") : "",
 441                        git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 442         }
 443
 444         return 0;
 445 }
 446
 447 static int guess_repository_type(const char *git_dir)
 448 {
 449         const char *slash;
 450         char *cwd;
 451         int cwd_is_git_dir;
 452
 453         /*
 454          * "GIT_DIR=. git init" is always bare.
 455          * "GIT_DIR=`pwd` git init" too.
 456          */
 457         if (!strcmp(".", git_dir))
 458                 return 1;
 459         cwd = xgetcwd();
 460         cwd_is_git_dir = !strcmp(git_dir, cwd);
 461         free(cwd);
 462         if (cwd_is_git_dir)
 463                 return 1;
 464         /*
 465          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 466          */
 467         if (!strcmp(git_dir, ".git"))
 468                 return 0;
 469         slash = strrchr(git_dir, '/');
 470         if (slash && !strcmp(slash, "/.git"))
 471                 return 0;
 472
 473         /*
 474          * Otherwise it is often bare.  At this point
 475          * we are just guessing.
 476          */
 477         return 1;
 478 }
 479
 480 static int shared_callback(const struct option *opt, const char *arg, int unset)
 481 {
 482         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 483         return 0;
 484 }
 485
 486 static const char *const init_db_usage[] = {
 487         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
 488         NULL
 489 };
 490
 491 /*
 492  * If you want to, you can share the DB area with any number of branches.
 493  * That has advantages: you can save space by sharing all the SHA1 objects.
 494  * On the other hand, it might just make lookup slower and messier. You
 495  * be the judge.  The default case is to have one DB per managed directory.
 496  */
 497 int cmd_init_db(int argc, const char **argv, const char *prefix)
 498 {
 499         const char *git_dir;
 500         const char *real_git_dir = NULL;
 501         const char *work_tree;
 502         const char *template_dir = NULL;
 503         unsigned int flags = 0;
 504         const struct option init_db_options[] = {
 505                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
 506                                 N_("directory from which templates will be used")),
 507                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 508                                 N_("create a bare repository"), 1),
 509                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 510                         N_("permissions"),
 511                         N_("specify that the git repository is to be shared amongst several users"),
 512                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 513                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
 514                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
 515                            N_("separate git dir from working tree")),
 516                 OPT_END()
 517         };
 518
 519         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 520
 521         if (real_git_dir && !is_absolute_path(real_git_dir))
 522                 real_git_dir = xstrdup(real_path(real_git_dir));
 523
 524         if (argc == 1) {
 525                 int mkdir_tried = 0;
 526         retry:
 527                 if (chdir(argv[0]) < 0) {
 528                         if (!mkdir_tried) {
 529                                 int saved;
 530                                 /*
 531                                  * At this point we haven't read any configuration,
 532                                  * and we know shared_repository should always be 0;
 533                                  * but just in case we play safe.
 534                                  */
 535                                 saved = shared_repository;
 536                                 shared_repository = 0;
 537                                 switch (safe_create_leading_directories_const(argv[0])) {
 538                                 case SCLD_OK:
 539                                 case SCLD_PERMS:
 540                                         break;
 541                                 case SCLD_EXISTS:
 542                                         errno = EEXIST;
 543                                         /* fallthru */
 544                                 default:
 545                                         die_errno(_("cannot mkdir %s"), argv[0]);
 546                                         break;
 547                                 }
 548                                 shared_repository = saved;
 549                                 if (mkdir(argv[0], 0777) < 0)
 550                                         die_errno(_("cannot mkdir %s"), argv[0]);
 551                                 mkdir_tried = 1;
 552                                 goto retry;
 553                         }
 554                         die_errno(_("cannot chdir to %s"), argv[0]);
 555                 }
 556         } else if (0 < argc) {
 557                 usage(init_db_usage[0]);
 558         }
 559         if (is_bare_repository_cfg == 1) {
 560                 char *cwd = xgetcwd();
 561                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 562                 free(cwd);
 563         }
 564
 565         if (init_shared_repository != -1)
 566                 shared_repository = init_shared_repository;
 567
 568         /*
 569          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 570          * without --bare.  Catch the error early.
 571          */
 572         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 573         work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 574         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 575                 die(_("%s (or --work-tree=<directory>) not allowed without "
 576                           "specifying %s (or --git-dir=<directory>)"),
 577                     GIT_WORK_TREE_ENVIRONMENT,
 578                     GIT_DIR_ENVIRONMENT);
 579
 580         /*
 581          * Set up the default .git directory contents
 582          */
 583         if (!git_dir)
 584                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 585
 586         if (is_bare_repository_cfg < 0)
 587                 is_bare_repository_cfg = guess_repository_type(git_dir);
 588
 589         if (!is_bare_repository_cfg) {
 590                 const char *git_dir_parent = strrchr(git_dir, '/');
 591                 if (git_dir_parent) {
 592                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 593                         git_work_tree_cfg = xstrdup(real_path(rel));
 594                         free(rel);
 595                 }
 596                 if (!git_work_tree_cfg)
 597                         git_work_tree_cfg = xgetcwd();
 598                 if (work_tree)
 599                         set_git_work_tree(work_tree);
 600                 else
 601                         set_git_work_tree(git_work_tree_cfg);
 602                 if (access(get_git_work_tree(), X_OK))
 603                         die_errno (_("Cannot access work tree '%s'"),
 604                                    get_git_work_tree());
 605         }
 606         else {
 607                 if (work_tree)
 608                         set_git_work_tree(work_tree);
 609         }
 610
 611         set_git_dir_init(git_dir, real_git_dir, 1);
 612
 613         return init_db(template_dir, flags);
 614 }