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                 warning("templates not found %s", template_dir);
 134                 return;
 135         }
 136
 137         /* Make sure that template is from the correct vintage */
 138         strcpy(template_path + template_len, "config");
 139         repository_format_version = 0;
 140         git_config_from_file(check_repository_format_version,
 141                              template_path, NULL);
 142         template_path[template_len] = 0;
 143
 144         if (repository_format_version &&
 145             repository_format_version != GIT_REPO_VERSION) {
 146                 warning("not copying templates of "
 147                         "a wrong format version %d from '%s'",
 148                         repository_format_version,
 149                         template_dir);
 150                 closedir(dir);
 151                 return;
 152         }
 153
 154         memcpy(path, git_dir, len);
 155         if (len && path[len - 1] != '/')
 156                 path[len++] = '/';
 157         path[len] = 0;
 158         copy_templates_1(path, len,
 159                          template_path, template_len,
 160                          dir);
 161         closedir(dir);
 162 }
 163
 164 static int create_default_files(const char *template_path)
 165 {
 166         const char *git_dir = get_git_dir();
 167         unsigned len = strlen(git_dir);
 168         static char path[PATH_MAX];
 169         struct stat st1;
 170         char repo_version_string[10];
 171         char junk[2];
 172         int reinit;
 173         int filemode;
 174
 175         if (len > sizeof(path)-50)
 176                 die("insane git directory %s", git_dir);
 177         memcpy(path, git_dir, len);
 178
 179         if (len && path[len-1] != '/')
 180                 path[len++] = '/';
 181
 182         /*
 183          * Create .git/refs/{heads,tags}
 184          */
 185         safe_create_dir(git_path("refs"), 1);
 186         safe_create_dir(git_path("refs/heads"), 1);
 187         safe_create_dir(git_path("refs/tags"), 1);
 188
 189         /* First copy the templates -- we might have the default
 190          * config file there, in which case we would want to read
 191          * from it after installing.
 192          */
 193         copy_templates(template_path);
 194
 195         git_config(git_default_config, NULL);
 196         is_bare_repository_cfg = init_is_bare_repository;
 197
 198         /* reading existing config may have overwrote it */
 199         if (init_shared_repository != -1)
 200                 shared_repository = init_shared_repository;
 201
 202         /*
 203          * We would have created the above under user's umask -- under
 204          * shared-repository settings, we would need to fix them up.
 205          */
 206         if (shared_repository) {
 207                 adjust_shared_perm(get_git_dir());
 208                 adjust_shared_perm(git_path("refs"));
 209                 adjust_shared_perm(git_path("refs/heads"));
 210                 adjust_shared_perm(git_path("refs/tags"));
 211         }
 212
 213         /*
 214          * Create the default symlink from ".git/HEAD" to the "master"
 215          * branch, if it does not exist yet.
 216          */
 217         strcpy(path + len, "HEAD");
 218         reinit = (!access(path, R_OK)
 219                   || readlink(path, junk, sizeof(junk)-1) != -1);
 220         if (!reinit) {
 221                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 222                         exit(1);
 223         }
 224
 225         /* This forces creation of new config file */
 226         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 227         git_config_set("core.repositoryformatversion", repo_version_string);
 228
 229         path[len] = 0;
 230         strcpy(path + len, "config");
 231
 232         /* Check filemode trustability */
 233         filemode = TEST_FILEMODE;
 234         if (TEST_FILEMODE && !lstat(path, &st1)) {
 235                 struct stat st2;
 236                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 237                                 !lstat(path, &st2) &&
 238                                 st1.st_mode != st2.st_mode);
 239         }
 240         git_config_set("core.filemode", filemode ? "true" : "false");
 241
 242         if (is_bare_repository())
 243                 git_config_set("core.bare", "true");
 244         else {
 245                 const char *work_tree = get_git_work_tree();
 246                 git_config_set("core.bare", "false");
 247                 /* allow template config file to override the default */
 248                 if (log_all_ref_updates == -1)
 249                     git_config_set("core.logallrefupdates", "true");
 250                 if (prefixcmp(git_dir, work_tree) ||
 251                     strcmp(git_dir + strlen(work_tree), "/.git")) {
 252                         git_config_set("core.worktree", work_tree);
 253                 }
 254         }
 255
 256         if (!reinit) {
 257                 /* Check if symlink is supported in the work tree */
 258                 path[len] = 0;
 259                 strcpy(path + len, "tXXXXXX");
 260                 if (!close(xmkstemp(path)) &&
 261                     !unlink(path) &&
 262                     !symlink("testing", path) &&
 263                     !lstat(path, &st1) &&
 264                     S_ISLNK(st1.st_mode))
 265                         unlink(path); /* good */
 266                 else
 267                         git_config_set("core.symlinks", "false");
 268
 269                 /* Check if the filesystem is case-insensitive */
 270                 path[len] = 0;
 271                 strcpy(path + len, "CoNfIg");
 272                 if (!access(path, F_OK))
 273                         git_config_set("core.ignorecase", "true");
 274         }
 275
 276         return reinit;
 277 }
 278
 279 int init_db(const char *template_dir, unsigned int flags)
 280 {
 281         const char *sha1_dir;
 282         char *path;
 283         int len, reinit;
 284
 285         safe_create_dir(get_git_dir(), 0);
 286
 287         init_is_bare_repository = is_bare_repository();
 288
 289         /* Check to see if the repository version is right.
 290          * Note that a newly created repository does not have
 291          * config file, so this will not fail.  What we are catching
 292          * is an attempt to reinitialize new repository with an old tool.
 293          */
 294         check_repository_format();
 295
 296         reinit = create_default_files(template_dir);
 297
 298         sha1_dir = get_object_directory();
 299         len = strlen(sha1_dir);
 300         path = xmalloc(len + 40);
 301         memcpy(path, sha1_dir, len);
 302
 303         safe_create_dir(sha1_dir, 1);
 304         strcpy(path+len, "/pack");
 305         safe_create_dir(path, 1);
 306         strcpy(path+len, "/info");
 307         safe_create_dir(path, 1);
 308
 309         if (shared_repository) {
 310                 char buf[10];
 311                 /* We do not spell "group" and such, so that
 312                  * the configuration can be read by older version
 313                  * of git. Note, we use octal numbers for new share modes,
 314                  * and compatibility values for PERM_GROUP and
 315                  * PERM_EVERYBODY.
 316                  */
 317                 if (shared_repository < 0)
 318                         /* force to the mode value */
 319                         sprintf(buf, "0%o", -shared_repository);
 320                 else if (shared_repository == PERM_GROUP)
 321                         sprintf(buf, "%d", OLD_PERM_GROUP);
 322                 else if (shared_repository == PERM_EVERYBODY)
 323                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
 324                 else
 325                         die("oops");
 326                 git_config_set("core.sharedrepository", buf);
 327                 git_config_set("receive.denyNonFastforwards", "true");
 328         }
 329
 330         if (!(flags & INIT_DB_QUIET))
 331                 printf("%s%s Git repository in %s/\n",
 332                        reinit ? "Reinitialized existing" : "Initialized empty",
 333                        shared_repository ? " shared" : "",
 334                        get_git_dir());
 335
 336         return 0;
 337 }
 338
 339 static int guess_repository_type(const char *git_dir)
 340 {
 341         char cwd[PATH_MAX];
 342         const char *slash;
 343
 344         /*
 345          * "GIT_DIR=. git init" is always bare.
 346          * "GIT_DIR=`pwd` git init" too.
 347          */
 348         if (!strcmp(".", git_dir))
 349                 return 1;
 350         if (!getcwd(cwd, sizeof(cwd)))
 351                 die("cannot tell cwd");
 352         if (!strcmp(git_dir, cwd))
 353                 return 1;
 354         /*
 355          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 356          */
 357         if (!strcmp(git_dir, ".git"))
 358                 return 0;
 359         slash = strrchr(git_dir, '/');
 360         if (slash && !strcmp(slash, "/.git"))
 361                 return 0;
 362
 363         /*
 364          * Otherwise it is often bare.  At this point
 365          * we are just guessing.
 366          */
 367         return 1;
 368 }
 369
 370 static const char init_db_usage[] =
 371 "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]]";
 372
 373 /*
 374  * If you want to, you can share the DB area with any number of branches.
 375  * That has advantages: you can save space by sharing all the SHA1 objects.
 376  * On the other hand, it might just make lookup slower and messier. You
 377  * be the judge.  The default case is to have one DB per managed directory.
 378  */
 379 int cmd_init_db(int argc, const char **argv, const char *prefix)
 380 {
 381         const char *git_dir;
 382         const char *template_dir = NULL;
 383         unsigned int flags = 0;
 384         int i;
 385
 386         for (i = 1; i < argc; i++, argv++) {
 387                 const char *arg = argv[1];
 388                 if (!prefixcmp(arg, "--template="))
 389                         template_dir = arg+11;
 390                 else if (!strcmp(arg, "--bare")) {
 391                         static char git_dir[PATH_MAX+1];
 392                         is_bare_repository_cfg = 1;
 393                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir,
 394                                                 sizeof(git_dir)), 0);
 395                 } else if (!strcmp(arg, "--shared"))
 396                         init_shared_repository = PERM_GROUP;
 397                 else if (!prefixcmp(arg, "--shared="))
 398                         init_shared_repository = git_config_perm("arg", arg+9);
 399                 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
 400                         flags |= INIT_DB_QUIET;
 401                 else
 402                         usage(init_db_usage);
 403         }
 404
 405         if (init_shared_repository != -1)
 406                 shared_repository = init_shared_repository;
 407
 408         /*
 409          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 410          * without --bare.  Catch the error early.
 411          */
 412         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 413         if ((!git_dir || is_bare_repository_cfg == 1)
 414             && getenv(GIT_WORK_TREE_ENVIRONMENT))
 415                 die("%s (or --work-tree=<directory>) not allowed without "
 416                     "specifying %s (or --git-dir=<directory>)",
 417                     GIT_WORK_TREE_ENVIRONMENT,
 418                     GIT_DIR_ENVIRONMENT);
 419
 420         /*
 421          * Set up the default .git directory contents
 422          */
 423         if (!git_dir)
 424                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 425
 426         if (is_bare_repository_cfg < 0)
 427                 is_bare_repository_cfg = guess_repository_type(git_dir);
 428
 429         if (!is_bare_repository_cfg) {
 430                 if (git_dir) {
 431                         const char *git_dir_parent = strrchr(git_dir, '/');
 432                         if (git_dir_parent) {
 433                                 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 434                                 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
 435                                 free(rel);
 436                         }
 437                 }
 438                 if (!git_work_tree_cfg) {
 439                         git_work_tree_cfg = xcalloc(PATH_MAX, 1);
 440                         if (!getcwd(git_work_tree_cfg, PATH_MAX))
 441                                 die ("Cannot access current working directory.");
 442                 }
 443                 if (access(get_git_work_tree(), X_OK))
 444                         die ("Cannot access work tree '%s'",
 445                              get_git_work_tree());
 446         }
 447
 448         set_git_dir(make_absolute_path(git_dir));
 449
 450         return init_db(template_dir, flags);
 451 }