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
  10 #ifndef DEFAULT_GIT_TEMPLATE_DIR
  11 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
  12 #endif
  13
  14 #ifdef NO_TRUSTABLE_FILEMODE
  15 #define TEST_FILEMODE 0
  16 #else
  17 #define TEST_FILEMODE 1
  18 #endif
  19
  20 static int init_is_bare_repository = 0;
  21 static int init_shared_repository = -1;
  22
  23 static void safe_create_dir(const char *dir, int share)
  24 {
  25         if (mkdir(dir, 0777) < 0) {
  26                 if (errno != EEXIST) {
  27                         perror(dir);
  28                         exit(1);
  29                 }
  30         }
  31         else if (share && adjust_shared_perm(dir))
  32                 die("Could not make %s writable by group", dir);
  33 }
  34
  35 static void copy_templates_1(char *path, int baselen,
  36                              char *template, int template_baselen,
  37                              DIR *dir)
  38 {
  39         struct dirent *de;
  40
  41         /* Note: if ".git/hooks" file exists in the repository being
  42          * re-initialized, /etc/core-git/templates/hooks/update would
  43          * cause "git init" to fail here.  I think this is sane but
  44          * it means that the set of templates we ship by default, along
  45          * with the way the namespace under .git/ is organized, should
  46          * be really carefully chosen.
  47          */
  48         safe_create_dir(path, 1);
  49         while ((de = readdir(dir)) != NULL) {
  50                 struct stat st_git, st_template;
  51                 int namelen;
  52                 int exists = 0;
  53
  54                 if (de->d_name[0] == '.')
  55                         continue;
  56                 namelen = strlen(de->d_name);
  57                 if ((PATH_MAX <= baselen + namelen) ||
  58                     (PATH_MAX <= template_baselen + namelen))
  59                         die("insanely long template name %s", de->d_name);
  60                 memcpy(path + baselen, de->d_name, namelen+1);
  61                 memcpy(template + template_baselen, de->d_name, namelen+1);
  62                 if (lstat(path, &st_git)) {
  63                         if (errno != ENOENT)
  64                                 die("cannot stat %s", path);
  65                 }
  66                 else
  67                         exists = 1;
  68
  69                 if (lstat(template, &st_template))
  70                         die("cannot stat template %s", template);
  71
  72                 if (S_ISDIR(st_template.st_mode)) {
  73                         DIR *subdir = opendir(template);
  74                         int baselen_sub = baselen + namelen;
  75                         int template_baselen_sub = template_baselen + namelen;
  76                         if (!subdir)
  77                                 die("cannot opendir %s", template);
  78                         path[baselen_sub++] =
  79                                 template[template_baselen_sub++] = '/';
  80                         path[baselen_sub] =
  81                                 template[template_baselen_sub] = 0;
  82                         copy_templates_1(path, baselen_sub,
  83                                          template, template_baselen_sub,
  84                                          subdir);
  85                         closedir(subdir);
  86                 }
  87                 else if (exists)
  88                         continue;
  89                 else if (S_ISLNK(st_template.st_mode)) {
  90                         char lnk[256];
  91                         int len;
  92                         len = readlink(template, lnk, sizeof(lnk));
  93                         if (len < 0)
  94                                 die("cannot readlink %s", template);
  95                         if (sizeof(lnk) <= len)
  96                                 die("insanely long symlink %s", template);
  97                         lnk[len] = 0;
  98                         if (symlink(lnk, path))
  99                                 die("cannot symlink %s %s", lnk, path);
 100                 }
 101                 else if (S_ISREG(st_template.st_mode)) {
 102                         if (copy_file(path, template, st_template.st_mode))
 103                                 die("cannot copy %s to %s", template, path);
 104                 }
 105                 else
 106                         error("ignoring template %s", template);
 107         }
 108 }
 109
 110 static void copy_templates(const char *template_dir)
 111 {
 112         char path[PATH_MAX];
 113         char template_path[PATH_MAX];
 114         int template_len;
 115         DIR *dir;
 116         const char *git_dir = get_git_dir();
 117         int len = strlen(git_dir);
 118
 119         if (!template_dir)
 120                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 121         if (!template_dir)
 122                 template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 123         if (!template_dir[0])
 124                 return;
 125         strcpy(template_path, template_dir);
 126         template_len = strlen(template_path);
 127         if (template_path[template_len-1] != '/') {
 128                 template_path[template_len++] = '/';
 129                 template_path[template_len] = 0;
 130         }
 131         dir = opendir(template_path);
 132         if (!dir) {
 133                 fprintf(stderr, "warning: templates not found %s\n",
 134                         template_dir);
 135                 return;
 136         }
 137
 138         /* Make sure that template is from the correct vintage */
 139         strcpy(template_path + template_len, "config");
 140         repository_format_version = 0;
 141         git_config_from_file(check_repository_format_version,
 142                              template_path, NULL);
 143         template_path[template_len] = 0;
 144
 145         if (repository_format_version &&
 146             repository_format_version != GIT_REPO_VERSION) {
 147                 fprintf(stderr, "warning: not copying templates of "
 148                         "a wrong format version %d from '%s'\n",
 149                         repository_format_version,
 150                         template_dir);
 151                 closedir(dir);
 152                 return;
 153         }
 154
 155         memcpy(path, git_dir, len);
 156         if (len && path[len - 1] != '/')
 157                 path[len++] = '/';
 158         path[len] = 0;
 159         copy_templates_1(path, len,
 160                          template_path, template_len,
 161                          dir);
 162         closedir(dir);
 163 }
 164
 165 static int create_default_files(const char *template_path)
 166 {
 167         const char *git_dir = get_git_dir();
 168         unsigned len = strlen(git_dir);
 169         static char path[PATH_MAX];
 170         struct stat st1;
 171         char repo_version_string[10];
 172         char junk[2];
 173         int reinit;
 174         int filemode;
 175
 176         if (len > sizeof(path)-50)
 177                 die("insane git directory %s", git_dir);
 178         memcpy(path, git_dir, len);
 179
 180         if (len && path[len-1] != '/')
 181                 path[len++] = '/';
 182
 183         /*
 184          * Create .git/refs/{heads,tags}
 185          */
 186         safe_create_dir(git_path("refs"), 1);
 187         safe_create_dir(git_path("refs/heads"), 1);
 188         safe_create_dir(git_path("refs/tags"), 1);
 189
 190         /* First copy the templates -- we might have the default
 191          * config file there, in which case we would want to read
 192          * from it after installing.
 193          */
 194         copy_templates(template_path);
 195
 196         git_config(git_default_config, NULL);
 197         is_bare_repository_cfg = init_is_bare_repository;
 198         if (init_shared_repository != -1)
 199                 shared_repository = init_shared_repository;
 200
 201         /*
 202          * We would have created the above under user's umask -- under
 203          * shared-repository settings, we would need to fix them up.
 204          */
 205         if (shared_repository) {
 206                 adjust_shared_perm(get_git_dir());
 207                 adjust_shared_perm(git_path("refs"));
 208                 adjust_shared_perm(git_path("refs/heads"));
 209                 adjust_shared_perm(git_path("refs/tags"));
 210         }
 211
 212         /*
 213          * Create the default symlink from ".git/HEAD" to the "master"
 214          * branch, if it does not exist yet.
 215          */
 216         strcpy(path + len, "HEAD");
 217         reinit = (!access(path, R_OK)
 218                   || readlink(path, junk, sizeof(junk)-1) != -1);
 219         if (!reinit) {
 220                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 221                         exit(1);
 222         }
 223
 224         /* This forces creation of new config file */
 225         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 226         git_config_set("core.repositoryformatversion", repo_version_string);
 227
 228         path[len] = 0;
 229         strcpy(path + len, "config");
 230
 231         /* Check filemode trustability */
 232         filemode = TEST_FILEMODE;
 233         if (TEST_FILEMODE && !lstat(path, &st1)) {
 234                 struct stat st2;
 235                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 236                                 !lstat(path, &st2) &&
 237                                 st1.st_mode != st2.st_mode);
 238         }
 239         git_config_set("core.filemode", filemode ? "true" : "false");
 240
 241         if (is_bare_repository())
 242                 git_config_set("core.bare", "true");
 243         else {
 244                 const char *work_tree = get_git_work_tree();
 245                 git_config_set("core.bare", "false");
 246                 /* allow template config file to override the default */
 247                 if (log_all_ref_updates == -1)
 248                     git_config_set("core.logallrefupdates", "true");
 249                 if (prefixcmp(git_dir, work_tree) ||
 250                     strcmp(git_dir + strlen(work_tree), "/.git")) {
 251                         git_config_set("core.worktree", work_tree);
 252                 }
 253         }
 254
 255         if (!reinit) {
 256                 /* Check if symlink is supported in the work tree */
 257                 path[len] = 0;
 258                 strcpy(path + len, "tXXXXXX");
 259                 if (!close(xmkstemp(path)) &&
 260                     !unlink(path) &&
 261                     !symlink("testing", path) &&
 262                     !lstat(path, &st1) &&
 263                     S_ISLNK(st1.st_mode))
 264                         unlink(path); /* good */
 265                 else
 266                         git_config_set("core.symlinks", "false");
 267
 268                 /* Check if the filesystem is case-insensitive */
 269                 path[len] = 0;
 270                 strcpy(path + len, "CoNfIg");
 271                 if (!access(path, F_OK))
 272                         git_config_set("core.ignorecase", "true");
 273         }
 274
 275         return reinit;
 276 }
 277
 278 int init_db(const char *template_dir, unsigned int flags)
 279 {
 280         const char *sha1_dir;
 281         char *path;
 282         int len, reinit;
 283
 284         safe_create_dir(get_git_dir(), 0);
 285
 286         init_is_bare_repository = is_bare_repository();
 287
 288         /* Check to see if the repository version is right.
 289          * Note that a newly created repository does not have
 290          * config file, so this will not fail.  What we are catching
 291          * is an attempt to reinitialize new repository with an old tool.
 292          */
 293         check_repository_format();
 294
 295         reinit = create_default_files(template_dir);
 296
 297         sha1_dir = get_object_directory();
 298         len = strlen(sha1_dir);
 299         path = xmalloc(len + 40);
 300         memcpy(path, sha1_dir, len);
 301
 302         safe_create_dir(sha1_dir, 1);
 303         strcpy(path+len, "/pack");
 304         safe_create_dir(path, 1);
 305         strcpy(path+len, "/info");
 306         safe_create_dir(path, 1);
 307
 308         if (shared_repository) {
 309                 char buf[10];
 310                 /* We do not spell "group" and such, so that
 311                  * the configuration can be read by older version
 312                  * of git. Note, we use octal numbers for new share modes,
 313                  * and compatibility values for PERM_GROUP and
 314                  * PERM_EVERYBODY.
 315                  */
 316                 if (shared_repository == PERM_GROUP)
 317                         sprintf(buf, "%d", OLD_PERM_GROUP);
 318                 else if (shared_repository == PERM_EVERYBODY)
 319                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
 320                 else
 321                         sprintf(buf, "0%o", shared_repository);
 322                 git_config_set("core.sharedrepository", buf);
 323                 git_config_set("receive.denyNonFastforwards", "true");
 324         }
 325
 326         if (!(flags & INIT_DB_QUIET))
 327                 printf("%s%s Git repository in %s/\n",
 328                        reinit ? "Reinitialized existing" : "Initialized empty",
 329                        shared_repository ? " shared" : "",
 330                        get_git_dir());
 331
 332         return 0;
 333 }
 334
 335 static int guess_repository_type(const char *git_dir)
 336 {
 337         char cwd[PATH_MAX];
 338         const char *slash;
 339
 340         /*
 341          * "GIT_DIR=. git init" is always bare.
 342          * "GIT_DIR=`pwd` git init" too.
 343          */
 344         if (!strcmp(".", git_dir))
 345                 return 1;
 346         if (!getcwd(cwd, sizeof(cwd)))
 347                 die("cannot tell cwd");
 348         if (!strcmp(git_dir, cwd))
 349                 return 1;
 350         /*
 351          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 352          */
 353         if (!strcmp(git_dir, ".git"))
 354                 return 0;
 355         slash = strrchr(git_dir, '/');
 356         if (slash && !strcmp(slash, "/.git"))
 357                 return 0;
 358
 359         /*
 360          * Otherwise it is often bare.  At this point
 361          * we are just guessing.
 362          */
 363         return 1;
 364 }
 365
 366 static const char init_db_usage[] =
 367 "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]]";
 368
 369 /*
 370  * If you want to, you can share the DB area with any number of branches.
 371  * That has advantages: you can save space by sharing all the SHA1 objects.
 372  * On the other hand, it might just make lookup slower and messier. You
 373  * be the judge.  The default case is to have one DB per managed directory.
 374  */
 375 int cmd_init_db(int argc, const char **argv, const char *prefix)
 376 {
 377         const char *git_dir;
 378         const char *template_dir = NULL;
 379         unsigned int flags = 0;
 380         int i;
 381
 382         for (i = 1; i < argc; i++, argv++) {
 383                 const char *arg = argv[1];
 384                 if (!prefixcmp(arg, "--template="))
 385                         template_dir = arg+11;
 386                 else if (!strcmp(arg, "--bare")) {
 387                         static char git_dir[PATH_MAX+1];
 388                         is_bare_repository_cfg = 1;
 389                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir,
 390                                                 sizeof(git_dir)), 0);
 391                 } else if (!strcmp(arg, "--shared"))
 392                         init_shared_repository = PERM_GROUP;
 393                 else if (!prefixcmp(arg, "--shared="))
 394                         init_shared_repository = git_config_perm("arg", arg+9);
 395                 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
 396                         flags |= INIT_DB_QUIET;
 397                 else
 398                         usage(init_db_usage);
 399         }
 400
 401         /*
 402          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 403          * without --bare.  Catch the error early.
 404          */
 405         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 406         if ((!git_dir || is_bare_repository_cfg == 1)
 407             && getenv(GIT_WORK_TREE_ENVIRONMENT))
 408                 die("%s (or --work-tree=<directory>) not allowed without "
 409                     "specifying %s (or --git-dir=<directory>)",
 410                     GIT_WORK_TREE_ENVIRONMENT,
 411                     GIT_DIR_ENVIRONMENT);
 412
 413         /*
 414          * Set up the default .git directory contents
 415          */
 416         if (!git_dir)
 417                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 418
 419         if (is_bare_repository_cfg < 0)
 420                 is_bare_repository_cfg = guess_repository_type(git_dir);
 421
 422         if (!is_bare_repository_cfg) {
 423                 if (git_dir) {
 424                         const char *git_dir_parent = strrchr(git_dir, '/');
 425                         if (git_dir_parent) {
 426                                 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 427                                 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
 428                                 free(rel);
 429                         }
 430                 }
 431                 if (!git_work_tree_cfg) {
 432                         git_work_tree_cfg = xcalloc(PATH_MAX, 1);
 433                         if (!getcwd(git_work_tree_cfg, PATH_MAX))
 434                                 die ("Cannot access current working directory.");
 435                 }
 436                 if (access(get_git_work_tree(), X_OK))
 437                         die ("Cannot access work tree '%s'",
 438                              get_git_work_tree());
 439         }
 440
 441         set_git_dir(make_absolute_path(git_dir));
 442
 443         return init_db(template_dir, flags);
 444 }