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                 fprintf(stderr, "warning: templates not found %s\n",
 136                         template_dir);
 137                 return;
 138         }
 139
 140         /* Make sure that template is from the correct vintage */
 141         strcpy(template_path + template_len, "config");
 142         repository_format_version = 0;
 143         git_config_from_file(check_repository_format_version,
 144                              template_path, NULL);
 145         template_path[template_len] = 0;
 146
 147         if (repository_format_version &&
 148             repository_format_version != GIT_REPO_VERSION) {
 149                 fprintf(stderr, "warning: not copying templates of "
 150                         "a wrong format version %d from '%s'\n",
 151                         repository_format_version,
 152                         template_dir);
 153                 closedir(dir);
 154                 return;
 155         }
 156
 157         memcpy(path, git_dir, len);
 158         if (len && path[len - 1] != '/')
 159                 path[len++] = '/';
 160         path[len] = 0;
 161         copy_templates_1(path, len,
 162                          template_path, template_len,
 163                          dir);
 164         closedir(dir);
 165 }
 166
 167 static int create_default_files(const char *template_path)
 168 {
 169         const char *git_dir = get_git_dir();
 170         unsigned len = strlen(git_dir);
 171         static char path[PATH_MAX];
 172         struct stat st1;
 173         char repo_version_string[10];
 174         char junk[2];
 175         int reinit;
 176         int filemode;
 177
 178         if (len > sizeof(path)-50)
 179                 die("insane git directory %s", git_dir);
 180         memcpy(path, git_dir, len);
 181
 182         if (len && path[len-1] != '/')
 183                 path[len++] = '/';
 184
 185         /*
 186          * Create .git/refs/{heads,tags}
 187          */
 188         safe_create_dir(git_path("refs"), 1);
 189         safe_create_dir(git_path("refs/heads"), 1);
 190         safe_create_dir(git_path("refs/tags"), 1);
 191
 192         /* First copy the templates -- we might have the default
 193          * config file there, in which case we would want to read
 194          * from it after installing.
 195          */
 196         copy_templates(template_path);
 197
 198         git_config(git_default_config, NULL);
 199         is_bare_repository_cfg = init_is_bare_repository;
 200
 201         /* reading existing config may have overwrote it */
 202         if (init_shared_repository != -1)
 203                 shared_repository = init_shared_repository;
 204
 205         /*
 206          * We would have created the above under user's umask -- under
 207          * shared-repository settings, we would need to fix them up.
 208          */
 209         if (shared_repository) {
 210                 adjust_shared_perm(get_git_dir());
 211                 adjust_shared_perm(git_path("refs"));
 212                 adjust_shared_perm(git_path("refs/heads"));
 213                 adjust_shared_perm(git_path("refs/tags"));
 214         }
 215
 216         /*
 217          * Create the default symlink from ".git/HEAD" to the "master"
 218          * branch, if it does not exist yet.
 219          */
 220         strcpy(path + len, "HEAD");
 221         reinit = (!access(path, R_OK)
 222                   || readlink(path, junk, sizeof(junk)-1) != -1);
 223         if (!reinit) {
 224                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 225                         exit(1);
 226         }
 227
 228         /* This forces creation of new config file */
 229         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 230         git_config_set("core.repositoryformatversion", repo_version_string);
 231
 232         path[len] = 0;
 233         strcpy(path + len, "config");
 234
 235         /* Check filemode trustability */
 236         filemode = TEST_FILEMODE;
 237         if (TEST_FILEMODE && !lstat(path, &st1)) {
 238                 struct stat st2;
 239                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 240                                 !lstat(path, &st2) &&
 241                                 st1.st_mode != st2.st_mode);
 242         }
 243         git_config_set("core.filemode", filemode ? "true" : "false");
 244
 245         if (is_bare_repository())
 246                 git_config_set("core.bare", "true");
 247         else {
 248                 const char *work_tree = get_git_work_tree();
 249                 git_config_set("core.bare", "false");
 250                 /* allow template config file to override the default */
 251                 if (log_all_ref_updates == -1)
 252                     git_config_set("core.logallrefupdates", "true");
 253                 if (prefixcmp(git_dir, work_tree) ||
 254                     strcmp(git_dir + strlen(work_tree), "/.git")) {
 255                         git_config_set("core.worktree", work_tree);
 256                 }
 257         }
 258
 259         if (!reinit) {
 260                 /* Check if symlink is supported in the work tree */
 261                 path[len] = 0;
 262                 strcpy(path + len, "tXXXXXX");
 263                 if (!close(xmkstemp(path)) &&
 264                     !unlink(path) &&
 265                     !symlink("testing", path) &&
 266                     !lstat(path, &st1) &&
 267                     S_ISLNK(st1.st_mode))
 268                         unlink(path); /* good */
 269                 else
 270                         git_config_set("core.symlinks", "false");
 271
 272                 /* Check if the filesystem is case-insensitive */
 273                 path[len] = 0;
 274                 strcpy(path + len, "CoNfIg");
 275                 if (!access(path, F_OK))
 276                         git_config_set("core.ignorecase", "true");
 277         }
 278
 279         return reinit;
 280 }
 281
 282 int init_db(const char *template_dir, unsigned int flags)
 283 {
 284         const char *sha1_dir;
 285         char *path;
 286         int len, reinit;
 287
 288         safe_create_dir(get_git_dir(), 0);
 289
 290         init_is_bare_repository = is_bare_repository();
 291
 292         /* Check to see if the repository version is right.
 293          * Note that a newly created repository does not have
 294          * config file, so this will not fail.  What we are catching
 295          * is an attempt to reinitialize new repository with an old tool.
 296          */
 297         check_repository_format();
 298
 299         reinit = create_default_files(template_dir);
 300
 301         sha1_dir = get_object_directory();
 302         len = strlen(sha1_dir);
 303         path = xmalloc(len + 40);
 304         memcpy(path, sha1_dir, len);
 305
 306         safe_create_dir(sha1_dir, 1);
 307         strcpy(path+len, "/pack");
 308         safe_create_dir(path, 1);
 309         strcpy(path+len, "/info");
 310         safe_create_dir(path, 1);
 311
 312         if (shared_repository) {
 313                 char buf[10];
 314                 /* We do not spell "group" and such, so that
 315                  * the configuration can be read by older version
 316                  * of git. Note, we use octal numbers for new share modes,
 317                  * and compatibility values for PERM_GROUP and
 318                  * PERM_EVERYBODY.
 319                  */
 320                 if (shared_repository < 0)
 321                         /* force to the mode value */
 322                         sprintf(buf, "0%o", -shared_repository);
 323                 else if (shared_repository == PERM_GROUP)
 324                         sprintf(buf, "%d", OLD_PERM_GROUP);
 325                 else if (shared_repository == PERM_EVERYBODY)
 326                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
 327                 else
 328                         die("oops");
 329                 git_config_set("core.sharedrepository", buf);
 330                 git_config_set("receive.denyNonFastforwards", "true");
 331         }
 332
 333         if (!(flags & INIT_DB_QUIET))
 334                 printf("%s%s Git repository in %s/\n",
 335                        reinit ? "Reinitialized existing" : "Initialized empty",
 336                        shared_repository ? " shared" : "",
 337                        get_git_dir());
 338
 339         return 0;
 340 }
 341
 342 static int guess_repository_type(const char *git_dir)
 343 {
 344         char cwd[PATH_MAX];
 345         const char *slash;
 346
 347         /*
 348          * "GIT_DIR=. git init" is always bare.
 349          * "GIT_DIR=`pwd` git init" too.
 350          */
 351         if (!strcmp(".", git_dir))
 352                 return 1;
 353         if (!getcwd(cwd, sizeof(cwd)))
 354                 die("cannot tell cwd");
 355         if (!strcmp(git_dir, cwd))
 356                 return 1;
 357         /*
 358          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 359          */
 360         if (!strcmp(git_dir, ".git"))
 361                 return 0;
 362         slash = strrchr(git_dir, '/');
 363         if (slash && !strcmp(slash, "/.git"))
 364                 return 0;
 365
 366         /*
 367          * Otherwise it is often bare.  At this point
 368          * we are just guessing.
 369          */
 370         return 1;
 371 }
 372
 373 static const char init_db_usage[] =
 374 "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]]";
 375
 376 /*
 377  * If you want to, you can share the DB area with any number of branches.
 378  * That has advantages: you can save space by sharing all the SHA1 objects.
 379  * On the other hand, it might just make lookup slower and messier. You
 380  * be the judge.  The default case is to have one DB per managed directory.
 381  */
 382 int cmd_init_db(int argc, const char **argv, const char *prefix)
 383 {
 384         const char *git_dir;
 385         const char *template_dir = NULL;
 386         unsigned int flags = 0;
 387         int i;
 388
 389         for (i = 1; i < argc; i++, argv++) {
 390                 const char *arg = argv[1];
 391                 if (!prefixcmp(arg, "--template="))
 392                         template_dir = arg+11;
 393                 else if (!strcmp(arg, "--bare")) {
 394                         static char git_dir[PATH_MAX+1];
 395                         is_bare_repository_cfg = 1;
 396                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir,
 397                                                 sizeof(git_dir)), 0);
 398                 } else if (!strcmp(arg, "--shared"))
 399                         init_shared_repository = PERM_GROUP;
 400                 else if (!prefixcmp(arg, "--shared="))
 401                         init_shared_repository = git_config_perm("arg", arg+9);
 402                 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
 403                         flags |= INIT_DB_QUIET;
 404                 else
 405                         usage(init_db_usage);
 406         }
 407
 408         if (init_shared_repository != -1)
 409                 shared_repository = init_shared_repository;
 410
 411         /*
 412          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 413          * without --bare.  Catch the error early.
 414          */
 415         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 416         if ((!git_dir || is_bare_repository_cfg == 1)
 417             && getenv(GIT_WORK_TREE_ENVIRONMENT))
 418                 die("%s (or --work-tree=<directory>) not allowed without "
 419                     "specifying %s (or --git-dir=<directory>)",
 420                     GIT_WORK_TREE_ENVIRONMENT,
 421                     GIT_DIR_ENVIRONMENT);
 422
 423         /*
 424          * Set up the default .git directory contents
 425          */
 426         if (!git_dir)
 427                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 428
 429         if (is_bare_repository_cfg < 0)
 430                 is_bare_repository_cfg = guess_repository_type(git_dir);
 431
 432         if (!is_bare_repository_cfg) {
 433                 if (git_dir) {
 434                         const char *git_dir_parent = strrchr(git_dir, '/');
 435                         if (git_dir_parent) {
 436                                 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 437                                 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
 438                                 free(rel);
 439                         }
 440                 }
 441                 if (!git_work_tree_cfg) {
 442                         git_work_tree_cfg = xcalloc(PATH_MAX, 1);
 443                         if (!getcwd(git_work_tree_cfg, PATH_MAX))
 444                                 die ("Cannot access current working directory.");
 445                 }
 446                 if (access(get_git_work_tree(), X_OK))
 447                         die ("Cannot access work tree '%s'",
 448                              get_git_work_tree());
 449         }
 450
 451         set_git_dir(make_absolute_path(git_dir));
 452
 453         return init_db(template_dir, flags);
 454 }