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 *git_dir, int len, const char *template_dir)
 108 {
 109         char path[PATH_MAX];
 110         char template_path[PATH_MAX];
 111         int template_len;
 112         DIR *dir;
 113
 114         if (!template_dir)
 115                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 116         if (!template_dir) {
 117                 /*
 118                  * if the hard-coded template is relative, it is
 119                  * interpreted relative to the exec_dir
 120                  */
 121                 template_dir = DEFAULT_GIT_TEMPLATE_DIR;
 122                 if (!is_absolute_path(template_dir)) {
 123                         struct strbuf d = STRBUF_INIT;
 124                         strbuf_addf(&d, "%s/%s", git_exec_path(), template_dir);
 125                         template_dir = strbuf_detach(&d, NULL);
 126                 }
 127         }
 128         strcpy(template_path, template_dir);
 129         template_len = strlen(template_path);
 130         if (template_path[template_len-1] != '/') {
 131                 template_path[template_len++] = '/';
 132                 template_path[template_len] = 0;
 133         }
 134         dir = opendir(template_path);
 135         if (!dir) {
 136                 fprintf(stderr, "warning: templates not found %s\n",
 137                         template_dir);
 138                 return;
 139         }
 140
 141         /* Make sure that template is from the correct vintage */
 142         strcpy(template_path + template_len, "config");
 143         repository_format_version = 0;
 144         git_config_from_file(check_repository_format_version,
 145                              template_path);
 146         template_path[template_len] = 0;
 147
 148         if (repository_format_version &&
 149             repository_format_version != GIT_REPO_VERSION) {
 150                 fprintf(stderr, "warning: not copying templates of "
 151                         "a wrong format version %d from '%s'\n",
 152                         repository_format_version,
 153                         template_dir);
 154                 closedir(dir);
 155                 return;
 156         }
 157
 158         memcpy(path, git_dir, 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 *git_dir, const char *template_path)
 167 {
 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         strcpy(path + len, "refs");
 187         safe_create_dir(path, 1);
 188         strcpy(path + len, "refs/heads");
 189         safe_create_dir(path, 1);
 190         strcpy(path + len, "refs/tags");
 191         safe_create_dir(path, 1);
 192
 193         /* First copy the templates -- we might have the default
 194          * config file there, in which case we would want to read
 195          * from it after installing.
 196          */
 197         path[len] = 0;
 198         copy_templates(path, len, template_path);
 199
 200         git_config(git_default_config);
 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                 path[len] = 0;
 208                 adjust_shared_perm(path);
 209                 strcpy(path + len, "refs");
 210                 adjust_shared_perm(path);
 211                 strcpy(path + len, "refs/heads");
 212                 adjust_shared_perm(path);
 213                 strcpy(path + len, "refs/tags");
 214                 adjust_shared_perm(path);
 215         }
 216
 217         /*
 218          * Create the default symlink from ".git/HEAD" to the "master"
 219          * branch, if it does not exist yet.
 220          */
 221         strcpy(path + len, "HEAD");
 222         reinit = (!access(path, R_OK)
 223                   || readlink(path, junk, sizeof(junk)-1) != -1);
 224         if (!reinit) {
 225                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 226                         exit(1);
 227         }
 228
 229         /* This forces creation of new config file */
 230         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 231         git_config_set("core.repositoryformatversion", repo_version_string);
 232
 233         path[len] = 0;
 234         strcpy(path + len, "config");
 235
 236         /* Check filemode trustability */
 237         filemode = TEST_FILEMODE;
 238         if (TEST_FILEMODE && !lstat(path, &st1)) {
 239                 struct stat st2;
 240                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 241                                 !lstat(path, &st2) &&
 242                                 st1.st_mode != st2.st_mode);
 243         }
 244         git_config_set("core.filemode", filemode ? "true" : "false");
 245
 246         if (is_bare_repository())
 247                 git_config_set("core.bare", "true");
 248         else {
 249                 const char *work_tree = get_git_work_tree();
 250                 git_config_set("core.bare", "false");
 251                 /* allow template config file to override the default */
 252                 if (log_all_ref_updates == -1)
 253                     git_config_set("core.logallrefupdates", "true");
 254                 if (work_tree != git_work_tree_cfg)
 255                         git_config_set("core.worktree", work_tree);
 256         }
 257
 258         /* Check if symlink is supported in the work tree */
 259         if (!reinit) {
 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
 272         return reinit;
 273 }
 274
 275 static void guess_repository_type(const char *git_dir)
 276 {
 277         char cwd[PATH_MAX];
 278         const char *slash;
 279
 280         if (0 <= is_bare_repository_cfg)
 281                 return;
 282         if (!git_dir)
 283                 return;
 284
 285         /*
 286          * "GIT_DIR=. git init" is always bare.
 287          * "GIT_DIR=`pwd` git init" too.
 288          */
 289         if (!strcmp(".", git_dir))
 290                 goto force_bare;
 291         if (!getcwd(cwd, sizeof(cwd)))
 292                 die("cannot tell cwd");
 293         if (!strcmp(git_dir, cwd))
 294                 goto force_bare;
 295         /*
 296          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 297          */
 298         if (!strcmp(git_dir, ".git"))
 299                 return;
 300         slash = strrchr(git_dir, '/');
 301         if (slash && !strcmp(slash, "/.git"))
 302                 return;
 303
 304         /*
 305          * Otherwise it is often bare.  At this point
 306          * we are just guessing.
 307          */
 308  force_bare:
 309         is_bare_repository_cfg = 1;
 310         return;
 311 }
 312
 313 static const char init_db_usage[] =
 314 "git-init [-q | --quiet] [--template=<template-directory>] [--shared]";
 315
 316 /*
 317  * If you want to, you can share the DB area with any number of branches.
 318  * That has advantages: you can save space by sharing all the SHA1 objects.
 319  * On the other hand, it might just make lookup slower and messier. You
 320  * be the judge.  The default case is to have one DB per managed directory.
 321  */
 322 int cmd_init_db(int argc, const char **argv, const char *prefix)
 323 {
 324         const char *git_dir;
 325         const char *sha1_dir;
 326         const char *template_dir = NULL;
 327         char *path;
 328         int len, i, reinit;
 329         int quiet = 0;
 330
 331         for (i = 1; i < argc; i++, argv++) {
 332                 const char *arg = argv[1];
 333                 if (!prefixcmp(arg, "--template="))
 334                         template_dir = arg+11;
 335                 else if (!strcmp(arg, "--shared"))
 336                         shared_repository = PERM_GROUP;
 337                 else if (!prefixcmp(arg, "--shared="))
 338                         shared_repository = git_config_perm("arg", arg+9);
 339                 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
 340                         quiet = 1;
 341                 else
 342                         usage(init_db_usage);
 343         }
 344
 345         /*
 346          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 347          * without --bare.  Catch the error early.
 348          */
 349         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 350         if ((!git_dir || is_bare_repository_cfg == 1)
 351             && getenv(GIT_WORK_TREE_ENVIRONMENT))
 352                 die("%s (or --work-tree=<directory>) not allowed without "
 353                     "specifying %s (or --git-dir=<directory>)",
 354                     GIT_WORK_TREE_ENVIRONMENT,
 355                     GIT_DIR_ENVIRONMENT);
 356
 357         guess_repository_type(git_dir);
 358
 359         if (is_bare_repository_cfg <= 0) {
 360                 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
 361                 if (!getcwd(git_work_tree_cfg, PATH_MAX))
 362                         die ("Cannot access current working directory.");
 363                 if (access(get_git_work_tree(), X_OK))
 364                         die ("Cannot access work tree '%s'",
 365                              get_git_work_tree());
 366         }
 367
 368         /*
 369          * Set up the default .git directory contents
 370          */
 371         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 372         if (!git_dir)
 373                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 374         safe_create_dir(git_dir, 0);
 375
 376         /* Check to see if the repository version is right.
 377          * Note that a newly created repository does not have
 378          * config file, so this will not fail.  What we are catching
 379          * is an attempt to reinitialize new repository with an old tool.
 380          */
 381         check_repository_format();
 382
 383         reinit = create_default_files(git_dir, template_dir);
 384
 385         /*
 386          * And set up the object store.
 387          */
 388         sha1_dir = get_object_directory();
 389         len = strlen(sha1_dir);
 390         path = xmalloc(len + 40);
 391         memcpy(path, sha1_dir, len);
 392
 393         safe_create_dir(sha1_dir, 1);
 394         strcpy(path+len, "/pack");
 395         safe_create_dir(path, 1);
 396         strcpy(path+len, "/info");
 397         safe_create_dir(path, 1);
 398
 399         if (shared_repository) {
 400                 char buf[10];
 401                 /* We do not spell "group" and such, so that
 402                  * the configuration can be read by older version
 403                  * of git. Note, we use octal numbers for new share modes,
 404                  * and compatibility values for PERM_GROUP and
 405                  * PERM_EVERYBODY.
 406                  */
 407                 if (shared_repository == PERM_GROUP)
 408                         sprintf(buf, "%d", OLD_PERM_GROUP);
 409                 else if (shared_repository == PERM_EVERYBODY)
 410                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
 411                 else
 412                         sprintf(buf, "0%o", shared_repository);
 413                 git_config_set("core.sharedrepository", buf);
 414                 git_config_set("receive.denyNonFastforwards", "true");
 415         }
 416
 417         if (!quiet)
 418                 printf("%s%s Git repository in %s/\n",
 419                        reinit ? "Reinitialized existing" : "Initialized empty",
 420                        shared_repository ? " shared" : "",
 421                        git_dir);
 422
 423         return 0;
 424 }