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
  24 static void safe_create_dir(const char *dir, int share)
  25 {
  26         if (mkdir(dir, 0777) < 0) {
  27                 if (errno != EEXIST) {
  28                         perror(dir);
  29                         exit(1);
  30                 }
  31         }
  32         else if (share && adjust_shared_perm(dir))
  33                 die("Could not make %s writable by group", dir);
  34 }
  35
  36 static void copy_templates_1(char *path, int baselen,
  37                              char *template, int template_baselen,
  38                              DIR *dir)
  39 {
  40         struct dirent *de;
  41
  42         /* Note: if ".git/hooks" file exists in the repository being
  43          * re-initialized, /etc/core-git/templates/hooks/update would
  44          * cause "git init" to fail here.  I think this is sane but
  45          * it means that the set of templates we ship by default, along
  46          * with the way the namespace under .git/ is organized, should
  47          * be really carefully chosen.
  48          */
  49         safe_create_dir(path, 1);
  50         while ((de = readdir(dir)) != NULL) {
  51                 struct stat st_git, st_template;
  52                 int namelen;
  53                 int exists = 0;
  54
  55                 if (de->d_name[0] == '.')
  56                         continue;
  57                 namelen = strlen(de->d_name);
  58                 if ((PATH_MAX <= baselen + namelen) ||
  59                     (PATH_MAX <= template_baselen + namelen))
  60                         die("insanely long template name %s", de->d_name);
  61                 memcpy(path + baselen, de->d_name, namelen+1);
  62                 memcpy(template + template_baselen, de->d_name, namelen+1);
  63                 if (lstat(path, &st_git)) {
  64                         if (errno != ENOENT)
  65                                 die_errno("cannot stat '%s'", path);
  66                 }
  67                 else
  68                         exists = 1;
  69
  70                 if (lstat(template, &st_template))
  71                         die_errno("cannot stat template '%s'", template);
  72
  73                 if (S_ISDIR(st_template.st_mode)) {
  74                         DIR *subdir = opendir(template);
  75                         int baselen_sub = baselen + namelen;
  76                         int template_baselen_sub = template_baselen + namelen;
  77                         if (!subdir)
  78                                 die_errno("cannot opendir '%s'", template);
  79                         path[baselen_sub++] =
  80                                 template[template_baselen_sub++] = '/';
  81                         path[baselen_sub] =
  82                                 template[template_baselen_sub] = 0;
  83                         copy_templates_1(path, baselen_sub,
  84                                          template, template_baselen_sub,
  85                                          subdir);
  86                         closedir(subdir);
  87                 }
  88                 else if (exists)
  89                         continue;
  90                 else if (S_ISLNK(st_template.st_mode)) {
  91                         char lnk[256];
  92                         int len;
  93                         len = readlink(template, lnk, sizeof(lnk));
  94                         if (len < 0)
  95                                 die_errno("cannot readlink '%s'", template);
  96                         if (sizeof(lnk) <= len)
  97                                 die("insanely long symlink %s", template);
  98                         lnk[len] = 0;
  99                         if (symlink(lnk, path))
 100                                 die_errno("cannot symlink '%s' '%s'", lnk, path);
 101                 }
 102                 else if (S_ISREG(st_template.st_mode)) {
 103                         if (copy_file(path, template, st_template.st_mode))
 104                                 die_errno("cannot copy '%s' to '%s'", template,
 105                                           path);
 106                 }
 107                 else
 108                         error("ignoring template %s", template);
 109         }
 110 }
 111
 112 static void copy_templates(const char *template_dir)
 113 {
 114         char path[PATH_MAX];
 115         char template_path[PATH_MAX];
 116         int template_len;
 117         DIR *dir;
 118         const char *git_dir = get_git_dir();
 119         int len = strlen(git_dir);
 120
 121         if (!template_dir)
 122                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 123         if (!template_dir)
 124                 template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 125         if (!template_dir[0])
 126                 return;
 127         template_len = strlen(template_dir);
 128         if (PATH_MAX <= (template_len+strlen("/config")))
 129                 die("insanely long template path %s", template_dir);
 130         strcpy(template_path, template_dir);
 131         if (template_path[template_len-1] != '/') {
 132                 template_path[template_len++] = '/';
 133                 template_path[template_len] = 0;
 134         }
 135         dir = opendir(template_path);
 136         if (!dir) {
 137                 warning("templates not found %s", template_dir);
 138                 return;
 139         }
 140
 141         /* Make sure that template is from the correct vintage */
 142         strcpy(template_path + template_len, "config");
 143         repository_format_version = 0;
 144         git_config_from_file(check_repository_format_version,
 145                              template_path, NULL);
 146         template_path[template_len] = 0;
 147
 148         if (repository_format_version &&
 149             repository_format_version != GIT_REPO_VERSION) {
 150                 warning("not copying templates of "
 151                         "a wrong format version %d from '%s'",
 152                         repository_format_version,
 153                         template_dir);
 154                 closedir(dir);
 155                 return;
 156         }
 157
 158         memcpy(path, git_dir, len);
 159         if (len && path[len - 1] != '/')
 160                 path[len++] = '/';
 161         path[len] = 0;
 162         copy_templates_1(path, len,
 163                          template_path, template_len,
 164                          dir);
 165         closedir(dir);
 166 }
 167
 168 static int create_default_files(const char *template_path)
 169 {
 170         const char *git_dir = get_git_dir();
 171         unsigned len = strlen(git_dir);
 172         static char path[PATH_MAX];
 173         struct stat st1;
 174         char repo_version_string[10];
 175         char junk[2];
 176         int reinit;
 177         int filemode;
 178
 179         if (len > sizeof(path)-50)
 180                 die("insane git directory %s", git_dir);
 181         memcpy(path, git_dir, len);
 182
 183         if (len && path[len-1] != '/')
 184                 path[len++] = '/';
 185
 186         /*
 187          * Create .git/refs/{heads,tags}
 188          */
 189         safe_create_dir(git_path("refs"), 1);
 190         safe_create_dir(git_path("refs/heads"), 1);
 191         safe_create_dir(git_path("refs/tags"), 1);
 192
 193         /* First copy the templates -- we might have the default
 194          * config file there, in which case we would want to read
 195          * from it after installing.
 196          */
 197         copy_templates(template_path);
 198
 199         git_config(git_default_config, NULL);
 200         is_bare_repository_cfg = init_is_bare_repository;
 201
 202         /* reading existing config may have overwrote it */
 203         if (init_shared_repository != -1)
 204                 shared_repository = init_shared_repository;
 205
 206         /*
 207          * We would have created the above under user's umask -- under
 208          * shared-repository settings, we would need to fix them up.
 209          */
 210         if (shared_repository) {
 211                 adjust_shared_perm(get_git_dir());
 212                 adjust_shared_perm(git_path("refs"));
 213                 adjust_shared_perm(git_path("refs/heads"));
 214                 adjust_shared_perm(git_path("refs/tags"));
 215         }
 216
 217         /*
 218          * Create the default symlink from ".git/HEAD" to the "master"
 219          * branch, if it does not exist yet.
 220          */
 221         strcpy(path + len, "HEAD");
 222         reinit = (!access(path, R_OK)
 223                   || readlink(path, junk, sizeof(junk)-1) != -1);
 224         if (!reinit) {
 225                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 226                         exit(1);
 227         }
 228
 229         /* This forces creation of new config file */
 230         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 231         git_config_set("core.repositoryformatversion", repo_version_string);
 232
 233         path[len] = 0;
 234         strcpy(path + len, "config");
 235
 236         /* Check filemode trustability */
 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         }
 244         git_config_set("core.filemode", filemode ? "true" : "false");
 245
 246         if (is_bare_repository())
 247                 git_config_set("core.bare", "true");
 248         else {
 249                 const char *work_tree = get_git_work_tree();
 250                 git_config_set("core.bare", "false");
 251                 /* allow template config file to override the default */
 252                 if (log_all_ref_updates == -1)
 253                     git_config_set("core.logallrefupdates", "true");
 254                 if (prefixcmp(git_dir, work_tree) ||
 255                     strcmp(git_dir + strlen(work_tree), "/.git")) {
 256                         git_config_set("core.worktree", work_tree);
 257                 }
 258         }
 259
 260         if (!reinit) {
 261                 /* Check if symlink is supported in the work tree */
 262                 path[len] = 0;
 263                 strcpy(path + len, "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[len] = 0;
 275                 strcpy(path + len, "CoNfIg");
 276                 if (!access(path, F_OK))
 277                         git_config_set("core.ignorecase", "true");
 278         }
 279
 280         return reinit;
 281 }
 282
 283 int init_db(const char *template_dir, unsigned int flags)
 284 {
 285         const char *sha1_dir;
 286         char *path;
 287         int len, reinit;
 288
 289         safe_create_dir(get_git_dir(), 0);
 290
 291         init_is_bare_repository = is_bare_repository();
 292
 293         /* Check to see if the repository version is right.
 294          * Note that a newly created repository does not have
 295          * config file, so this will not fail.  What we are catching
 296          * is an attempt to reinitialize new repository with an old tool.
 297          */
 298         check_repository_format();
 299
 300         reinit = create_default_files(template_dir);
 301
 302         sha1_dir = get_object_directory();
 303         len = strlen(sha1_dir);
 304         path = xmalloc(len + 40);
 305         memcpy(path, sha1_dir, len);
 306
 307         safe_create_dir(sha1_dir, 1);
 308         strcpy(path+len, "/pack");
 309         safe_create_dir(path, 1);
 310         strcpy(path+len, "/info");
 311         safe_create_dir(path, 1);
 312
 313         if (shared_repository) {
 314                 char buf[10];
 315                 /* We do not spell "group" and such, so that
 316                  * the configuration can be read by older version
 317                  * of git. Note, we use octal numbers for new share modes,
 318                  * and compatibility values for PERM_GROUP and
 319                  * PERM_EVERYBODY.
 320                  */
 321                 if (shared_repository < 0)
 322                         /* force to the mode value */
 323                         sprintf(buf, "0%o", -shared_repository);
 324                 else if (shared_repository == PERM_GROUP)
 325                         sprintf(buf, "%d", OLD_PERM_GROUP);
 326                 else if (shared_repository == PERM_EVERYBODY)
 327                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
 328                 else
 329                         die("oops");
 330                 git_config_set("core.sharedrepository", buf);
 331                 git_config_set("receive.denyNonFastforwards", "true");
 332         }
 333
 334         if (!(flags & INIT_DB_QUIET))
 335                 printf("%s%s Git repository in %s/\n",
 336                        reinit ? "Reinitialized existing" : "Initialized empty",
 337                        shared_repository ? " shared" : "",
 338                        get_git_dir());
 339
 340         return 0;
 341 }
 342
 343 static int guess_repository_type(const char *git_dir)
 344 {
 345         char cwd[PATH_MAX];
 346         const char *slash;
 347
 348         /*
 349          * "GIT_DIR=. git init" is always bare.
 350          * "GIT_DIR=`pwd` git init" too.
 351          */
 352         if (!strcmp(".", git_dir))
 353                 return 1;
 354         if (!getcwd(cwd, sizeof(cwd)))
 355                 die_errno("cannot tell cwd");
 356         if (!strcmp(git_dir, cwd))
 357                 return 1;
 358         /*
 359          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 360          */
 361         if (!strcmp(git_dir, ".git"))
 362                 return 0;
 363         slash = strrchr(git_dir, '/');
 364         if (slash && !strcmp(slash, "/.git"))
 365                 return 0;
 366
 367         /*
 368          * Otherwise it is often bare.  At this point
 369          * we are just guessing.
 370          */
 371         return 1;
 372 }
 373
 374 static int shared_callback(const struct option *opt, const char *arg, int unset)
 375 {
 376         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 377         return 0;
 378 }
 379
 380 static const char *const init_db_usage[] = {
 381         "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]",
 382         NULL
 383 };
 384
 385 /*
 386  * If you want to, you can share the DB area with any number of branches.
 387  * That has advantages: you can save space by sharing all the SHA1 objects.
 388  * On the other hand, it might just make lookup slower and messier. You
 389  * be the judge.  The default case is to have one DB per managed directory.
 390  */
 391 int cmd_init_db(int argc, const char **argv, const char *prefix)
 392 {
 393         const char *git_dir;
 394         const char *template_dir = NULL;
 395         unsigned int flags = 0;
 396         const struct option init_db_options[] = {
 397                 OPT_STRING(0, "template", &template_dir, "template-directory",
 398                                 "provide the directory from which templates will be used"),
 399                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 400                                 "create a bare repository", 1),
 401                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 402                         "permissions",
 403                         "specify that the git repository is to be shared amongst several users",
 404                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 405                 OPT_BIT('q', "quiet", &flags, "be quiet", INIT_DB_QUIET),
 406                 OPT_END()
 407         };
 408
 409         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 410
 411         if (argc == 1) {
 412                 int mkdir_tried = 0;
 413         retry:
 414                 if (chdir(argv[0]) < 0) {
 415                         if (!mkdir_tried) {
 416                                 int saved;
 417                                 /*
 418                                  * At this point we haven't read any configuration,
 419                                  * and we know shared_repository should always be 0;
 420                                  * but just in case we play safe.
 421                                  */
 422                                 saved = shared_repository;
 423                                 shared_repository = 0;
 424                                 switch (safe_create_leading_directories_const(argv[0])) {
 425                                 case -3:
 426                                         errno = EEXIST;
 427                                         /* fallthru */
 428                                 case -1:
 429                                         die_errno("cannot mkdir %s", argv[0]);
 430                                         break;
 431                                 default:
 432                                         break;
 433                                 }
 434                                 shared_repository = saved;
 435                                 if (mkdir(argv[0], 0777) < 0)
 436                                         die_errno("cannot mkdir %s", argv[0]);
 437                                 mkdir_tried = 1;
 438                                 goto retry;
 439                         }
 440                         die_errno("cannot chdir to %s", argv[0]);
 441                 }
 442         } else if (0 < argc) {
 443                 usage(init_db_usage[0]);
 444         }
 445         if (is_bare_repository_cfg == 1) {
 446                 static char git_dir[PATH_MAX+1];
 447
 448                 setenv(GIT_DIR_ENVIRONMENT,
 449                         getcwd(git_dir, sizeof(git_dir)), 0);
 450         }
 451
 452         if (init_shared_repository != -1)
 453                 shared_repository = init_shared_repository;
 454
 455         /*
 456          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 457          * without --bare.  Catch the error early.
 458          */
 459         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 460         if ((!git_dir || is_bare_repository_cfg == 1)
 461             && getenv(GIT_WORK_TREE_ENVIRONMENT))
 462                 die("%s (or --work-tree=<directory>) not allowed without "
 463                     "specifying %s (or --git-dir=<directory>)",
 464                     GIT_WORK_TREE_ENVIRONMENT,
 465                     GIT_DIR_ENVIRONMENT);
 466
 467         /*
 468          * Set up the default .git directory contents
 469          */
 470         if (!git_dir)
 471                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 472
 473         if (is_bare_repository_cfg < 0)
 474                 is_bare_repository_cfg = guess_repository_type(git_dir);
 475
 476         if (!is_bare_repository_cfg) {
 477                 if (git_dir) {
 478                         const char *git_dir_parent = strrchr(git_dir, '/');
 479                         if (git_dir_parent) {
 480                                 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 481                                 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
 482                                 free(rel);
 483                         }
 484                 }
 485                 if (!git_work_tree_cfg) {
 486                         git_work_tree_cfg = xcalloc(PATH_MAX, 1);
 487                         if (!getcwd(git_work_tree_cfg, PATH_MAX))
 488                                 die_errno ("Cannot access current working directory");
 489                 }
 490                 if (access(get_git_work_tree(), X_OK))
 491                         die_errno ("Cannot access work tree '%s'",
 492                                    get_git_work_tree());
 493         }
 494
 495         set_git_dir(make_absolute_path(git_dir));
 496
 497         return init_db(template_dir, flags);
 498 }