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