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                         const char *exec_path = git_exec_path();
 124                         template_dir = prefix_path(exec_path, strlen(exec_path),
 125                                                    template_dir);
 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         unsigned char sha1[20];
 171         struct stat st1;
 172         char repo_version_string[10];
 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 = !read_ref("HEAD", sha1);
 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 (work_tree != git_work_tree_cfg)
 254                         git_config_set("core.worktree", work_tree);
 255         }
 256
 257         /* Check if symlink is supported in the work tree */
 258         if (!reinit) {
 259                 path[len] = 0;
 260                 strcpy(path + len, "tXXXXXX");
 261                 if (!close(xmkstemp(path)) &&
 262                     !unlink(path) &&
 263                     !symlink("testing", path) &&
 264                     !lstat(path, &st1) &&
 265                     S_ISLNK(st1.st_mode))
 266                         unlink(path); /* good */
 267                 else
 268                         git_config_set("core.symlinks", "false");
 269         }
 270
 271         return reinit;
 272 }
 273
 274 static void guess_repository_type(const char *git_dir)
 275 {
 276         char cwd[PATH_MAX];
 277         const char *slash;
 278
 279         if (0 <= is_bare_repository_cfg)
 280                 return;
 281         if (!git_dir)
 282                 return;
 283
 284         /*
 285          * "GIT_DIR=. git init" is always bare.
 286          * "GIT_DIR=`pwd` git init" too.
 287          */
 288         if (!strcmp(".", git_dir))
 289                 goto force_bare;
 290         if (!getcwd(cwd, sizeof(cwd)))
 291                 die("cannot tell cwd");
 292         if (!strcmp(git_dir, cwd))
 293                 goto force_bare;
 294         /*
 295          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 296          */
 297         if (!strcmp(git_dir, ".git"))
 298                 return;
 299         slash = strrchr(git_dir, '/');
 300         if (slash && !strcmp(slash, "/.git"))
 301                 return;
 302
 303         /*
 304          * Otherwise it is often bare.  At this point
 305          * we are just guessing.
 306          */
 307  force_bare:
 308         is_bare_repository_cfg = 1;
 309         return;
 310 }
 311
 312 static const char init_db_usage[] =
 313 "git-init [-q | --quiet] [--template=<template-directory>] [--shared]";
 314
 315 /*
 316  * If you want to, you can share the DB area with any number of branches.
 317  * That has advantages: you can save space by sharing all the SHA1 objects.
 318  * On the other hand, it might just make lookup slower and messier. You
 319  * be the judge.  The default case is to have one DB per managed directory.
 320  */
 321 int cmd_init_db(int argc, const char **argv, const char *prefix)
 322 {
 323         const char *git_dir;
 324         const char *sha1_dir;
 325         const char *template_dir = NULL;
 326         char *path;
 327         int len, i, reinit;
 328         int quiet = 0;
 329
 330         for (i = 1; i < argc; i++, argv++) {
 331                 const char *arg = argv[1];
 332                 if (!prefixcmp(arg, "--template="))
 333                         template_dir = arg+11;
 334                 else if (!strcmp(arg, "--shared"))
 335                         shared_repository = PERM_GROUP;
 336                 else if (!prefixcmp(arg, "--shared="))
 337                         shared_repository = git_config_perm("arg", arg+9);
 338                 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
 339                         quiet = 1;
 340                 else
 341                         usage(init_db_usage);
 342         }
 343
 344         /*
 345          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 346          * without --bare.  Catch the error early.
 347          */
 348         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 349         if ((!git_dir || is_bare_repository_cfg == 1)
 350             && getenv(GIT_WORK_TREE_ENVIRONMENT))
 351                 die("%s (or --work-tree=<directory>) not allowed without "
 352                     "specifying %s (or --git-dir=<directory>)",
 353                     GIT_WORK_TREE_ENVIRONMENT,
 354                     GIT_DIR_ENVIRONMENT);
 355
 356         guess_repository_type(git_dir);
 357
 358         if (is_bare_repository_cfg <= 0) {
 359                 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
 360                 if (!getcwd(git_work_tree_cfg, PATH_MAX))
 361                         die ("Cannot access current working directory.");
 362                 if (access(get_git_work_tree(), X_OK))
 363                         die ("Cannot access work tree '%s'",
 364                              get_git_work_tree());
 365         }
 366
 367         /*
 368          * Set up the default .git directory contents
 369          */
 370         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 371         if (!git_dir)
 372                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 373         safe_create_dir(git_dir, 0);
 374
 375         /* Check to see if the repository version is right.
 376          * Note that a newly created repository does not have
 377          * config file, so this will not fail.  What we are catching
 378          * is an attempt to reinitialize new repository with an old tool.
 379          */
 380         check_repository_format();
 381
 382         reinit = create_default_files(git_dir, template_dir);
 383
 384         /*
 385          * And set up the object store.
 386          */
 387         sha1_dir = get_object_directory();
 388         len = strlen(sha1_dir);
 389         path = xmalloc(len + 40);
 390         memcpy(path, sha1_dir, len);
 391
 392         safe_create_dir(sha1_dir, 1);
 393         strcpy(path+len, "/pack");
 394         safe_create_dir(path, 1);
 395         strcpy(path+len, "/info");
 396         safe_create_dir(path, 1);
 397
 398         if (shared_repository) {
 399                 char buf[10];
 400                 /* We do not spell "group" and such, so that
 401                  * the configuration can be read by older version
 402                  * of git.
 403                  */
 404                 sprintf(buf, "%d", shared_repository);
 405                 git_config_set("core.sharedrepository", buf);
 406                 git_config_set("receive.denyNonFastforwards", "true");
 407         }
 408
 409         if (!quiet)
 410                 printf("%s%s Git repository in %s/\n",
 411                        reinit ? "Reinitialized existing" : "Initialized empty",
 412                        shared_repository ? " shared" : "",
 413                        git_dir);
 414
 415         return 0;
 416 }