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         template_len = strlen(template_dir);
 126         if (PATH_MAX <= (template_len+strlen("/config")))
 127                 die("insanely long template path %s", template_dir);
 128         strcpy(template_path, template_dir);
 129         if (template_path[template_len-1] != '/') {
 130                 template_path[template_len++] = '/';
 131                 template_path[template_len] = 0;
 132         }
 133         dir = opendir(template_path);
 134         if (!dir) {
 135                 warning("templates not found %s", template_dir);
 136                 return;
 137         }
 138
 139         /* Make sure that template is from the correct vintage */
 140         strcpy(template_path + template_len, "config");
 141         repository_format_version = 0;
 142         git_config_from_file(check_repository_format_version,
 143                              template_path, NULL);
 144         template_path[template_len] = 0;
 145
 146         if (repository_format_version &&
 147             repository_format_version != GIT_REPO_VERSION) {
 148                 warning("not copying templates of "
 149                         "a wrong format version %d from '%s'",
 150                         repository_format_version,
 151                         template_dir);
 152                 closedir(dir);
 153                 return;
 154         }
 155
 156         memcpy(path, git_dir, len);
 157         if (len && path[len - 1] != '/')
 158                 path[len++] = '/';
 159         path[len] = 0;
 160         copy_templates_1(path, len,
 161                          template_path, template_len,
 162                          dir);
 163         closedir(dir);
 164 }
 165
 166 static int create_default_files(const char *template_path)
 167 {
 168         const char *git_dir = get_git_dir();
 169         unsigned len = strlen(git_dir);
 170         static char path[PATH_MAX];
 171         struct stat st1;
 172         char repo_version_string[10];
 173         char junk[2];
 174         int reinit;
 175         int filemode;
 176
 177         if (len > sizeof(path)-50)
 178                 die("insane git directory %s", git_dir);
 179         memcpy(path, git_dir, len);
 180
 181         if (len && path[len-1] != '/')
 182                 path[len++] = '/';
 183
 184         /*
 185          * Create .git/refs/{heads,tags}
 186          */
 187         safe_create_dir(git_path("refs"), 1);
 188         safe_create_dir(git_path("refs/heads"), 1);
 189         safe_create_dir(git_path("refs/tags"), 1);
 190
 191         /* First copy the templates -- we might have the default
 192          * config file there, in which case we would want to read
 193          * from it after installing.
 194          */
 195         copy_templates(template_path);
 196
 197         git_config(git_default_config, NULL);
 198         is_bare_repository_cfg = init_is_bare_repository;
 199
 200         /* reading existing config may have overwrote it */
 201         if (init_shared_repository != -1)
 202                 shared_repository = init_shared_repository;
 203
 204         /*
 205          * We would have created the above under user's umask -- under
 206          * shared-repository settings, we would need to fix them up.
 207          */
 208         if (shared_repository) {
 209                 adjust_shared_perm(get_git_dir());
 210                 adjust_shared_perm(git_path("refs"));
 211                 adjust_shared_perm(git_path("refs/heads"));
 212                 adjust_shared_perm(git_path("refs/tags"));
 213         }
 214
 215         /*
 216          * Create the default symlink from ".git/HEAD" to the "master"
 217          * branch, if it does not exist yet.
 218          */
 219         strcpy(path + len, "HEAD");
 220         reinit = (!access(path, R_OK)
 221                   || readlink(path, junk, sizeof(junk)-1) != -1);
 222         if (!reinit) {
 223                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 224                         exit(1);
 225         }
 226
 227         /* This forces creation of new config file */
 228         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 229         git_config_set("core.repositoryformatversion", repo_version_string);
 230
 231         path[len] = 0;
 232         strcpy(path + len, "config");
 233
 234         /* Check filemode trustability */
 235         filemode = TEST_FILEMODE;
 236         if (TEST_FILEMODE && !lstat(path, &st1)) {
 237                 struct stat st2;
 238                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 239                                 !lstat(path, &st2) &&
 240                                 st1.st_mode != st2.st_mode);
 241         }
 242         git_config_set("core.filemode", filemode ? "true" : "false");
 243
 244         if (is_bare_repository())
 245                 git_config_set("core.bare", "true");
 246         else {
 247                 const char *work_tree = get_git_work_tree();
 248                 git_config_set("core.bare", "false");
 249                 /* allow template config file to override the default */
 250                 if (log_all_ref_updates == -1)
 251                     git_config_set("core.logallrefupdates", "true");
 252                 if (prefixcmp(git_dir, work_tree) ||
 253                     strcmp(git_dir + strlen(work_tree), "/.git")) {
 254                         git_config_set("core.worktree", work_tree);
 255                 }
 256         }
 257
 258         if (!reinit) {
 259                 /* Check if symlink is supported in the work tree */
 260                 path[len] = 0;
 261                 strcpy(path + len, "tXXXXXX");
 262                 if (!close(xmkstemp(path)) &&
 263                     !unlink(path) &&
 264                     !symlink("testing", path) &&
 265                     !lstat(path, &st1) &&
 266                     S_ISLNK(st1.st_mode))
 267                         unlink(path); /* good */
 268                 else
 269                         git_config_set("core.symlinks", "false");
 270
 271                 /* Check if the filesystem is case-insensitive */
 272                 path[len] = 0;
 273                 strcpy(path + len, "CoNfIg");
 274                 if (!access(path, F_OK))
 275                         git_config_set("core.ignorecase", "true");
 276         }
 277
 278         return reinit;
 279 }
 280
 281 int init_db(const char *template_dir, unsigned int flags)
 282 {
 283         const char *sha1_dir;
 284         char *path;
 285         int len, reinit;
 286
 287         safe_create_dir(get_git_dir(), 0);
 288
 289         init_is_bare_repository = is_bare_repository();
 290
 291         /* Check to see if the repository version is right.
 292          * Note that a newly created repository does not have
 293          * config file, so this will not fail.  What we are catching
 294          * is an attempt to reinitialize new repository with an old tool.
 295          */
 296         check_repository_format();
 297
 298         reinit = create_default_files(template_dir);
 299
 300         sha1_dir = get_object_directory();
 301         len = strlen(sha1_dir);
 302         path = xmalloc(len + 40);
 303         memcpy(path, sha1_dir, len);
 304
 305         safe_create_dir(sha1_dir, 1);
 306         strcpy(path+len, "/pack");
 307         safe_create_dir(path, 1);
 308         strcpy(path+len, "/info");
 309         safe_create_dir(path, 1);
 310
 311         if (shared_repository) {
 312                 char buf[10];
 313                 /* We do not spell "group" and such, so that
 314                  * the configuration can be read by older version
 315                  * of git. Note, we use octal numbers for new share modes,
 316                  * and compatibility values for PERM_GROUP and
 317                  * PERM_EVERYBODY.
 318                  */
 319                 if (shared_repository < 0)
 320                         /* force to the mode value */
 321                         sprintf(buf, "0%o", -shared_repository);
 322                 else if (shared_repository == PERM_GROUP)
 323                         sprintf(buf, "%d", OLD_PERM_GROUP);
 324                 else if (shared_repository == PERM_EVERYBODY)
 325                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
 326                 else
 327                         die("oops");
 328                 git_config_set("core.sharedrepository", buf);
 329                 git_config_set("receive.denyNonFastforwards", "true");
 330         }
 331
 332         if (!(flags & INIT_DB_QUIET))
 333                 printf("%s%s Git repository in %s/\n",
 334                        reinit ? "Reinitialized existing" : "Initialized empty",
 335                        shared_repository ? " shared" : "",
 336                        get_git_dir());
 337
 338         return 0;
 339 }
 340
 341 static int guess_repository_type(const char *git_dir)
 342 {
 343         char cwd[PATH_MAX];
 344         const char *slash;
 345
 346         /*
 347          * "GIT_DIR=. git init" is always bare.
 348          * "GIT_DIR=`pwd` git init" too.
 349          */
 350         if (!strcmp(".", git_dir))
 351                 return 1;
 352         if (!getcwd(cwd, sizeof(cwd)))
 353                 die("cannot tell cwd");
 354         if (!strcmp(git_dir, cwd))
 355                 return 1;
 356         /*
 357          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 358          */
 359         if (!strcmp(git_dir, ".git"))
 360                 return 0;
 361         slash = strrchr(git_dir, '/');
 362         if (slash && !strcmp(slash, "/.git"))
 363                 return 0;
 364
 365         /*
 366          * Otherwise it is often bare.  At this point
 367          * we are just guessing.
 368          */
 369         return 1;
 370 }
 371
 372 static const char init_db_usage[] =
 373 "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]]";
 374
 375 /*
 376  * If you want to, you can share the DB area with any number of branches.
 377  * That has advantages: you can save space by sharing all the SHA1 objects.
 378  * On the other hand, it might just make lookup slower and messier. You
 379  * be the judge.  The default case is to have one DB per managed directory.
 380  */
 381 int cmd_init_db(int argc, const char **argv, const char *prefix)
 382 {
 383         const char *git_dir;
 384         const char *template_dir = NULL;
 385         unsigned int flags = 0;
 386         int i;
 387
 388         for (i = 1; i < argc; i++, argv++) {
 389                 const char *arg = argv[1];
 390                 if (!prefixcmp(arg, "--template="))
 391                         template_dir = arg+11;
 392                 else if (!strcmp(arg, "--bare")) {
 393                         static char git_dir[PATH_MAX+1];
 394                         is_bare_repository_cfg = 1;
 395                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir,
 396                                                 sizeof(git_dir)), 0);
 397                 } else if (!strcmp(arg, "--shared"))
 398                         init_shared_repository = PERM_GROUP;
 399                 else if (!prefixcmp(arg, "--shared="))
 400                         init_shared_repository = git_config_perm("arg", arg+9);
 401                 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
 402                         flags |= INIT_DB_QUIET;
 403                 else
 404                         usage(init_db_usage);
 405         }
 406
 407         if (init_shared_repository != -1)
 408                 shared_repository = init_shared_repository;
 409
 410         /*
 411          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 412          * without --bare.  Catch the error early.
 413          */
 414         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 415         if ((!git_dir || is_bare_repository_cfg == 1)
 416             && getenv(GIT_WORK_TREE_ENVIRONMENT))
 417                 die("%s (or --work-tree=<directory>) not allowed without "
 418                     "specifying %s (or --git-dir=<directory>)",
 419                     GIT_WORK_TREE_ENVIRONMENT,
 420                     GIT_DIR_ENVIRONMENT);
 421
 422         /*
 423          * Set up the default .git directory contents
 424          */
 425         if (!git_dir)
 426                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 427
 428         if (is_bare_repository_cfg < 0)
 429                 is_bare_repository_cfg = guess_repository_type(git_dir);
 430
 431         if (!is_bare_repository_cfg) {
 432                 if (git_dir) {
 433                         const char *git_dir_parent = strrchr(git_dir, '/');
 434                         if (git_dir_parent) {
 435                                 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 436                                 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
 437                                 free(rel);
 438                         }
 439                 }
 440                 if (!git_work_tree_cfg) {
 441                         git_work_tree_cfg = xcalloc(PATH_MAX, 1);
 442                         if (!getcwd(git_work_tree_cfg, PATH_MAX))
 443                                 die ("Cannot access current working directory.");
 444                 }
 445                 if (access(get_git_work_tree(), X_OK))
 446                         die ("Cannot access work tree '%s'",
 447                              get_git_work_tree());
 448         }
 449
 450         set_git_dir(make_absolute_path(git_dir));
 451
 452         return init_db(template_dir, flags);
 453 }