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
   9 #ifndef DEFAULT_GIT_TEMPLATE_DIR
  10 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
  11 #endif
  12
  13 #ifdef NO_TRUSTABLE_FILEMODE
  14 #define TEST_FILEMODE 0
  15 #else
  16 #define TEST_FILEMODE 1
  17 #endif
  18
  19 static void safe_create_dir(const char *dir, int share)
  20 {
  21         if (mkdir(dir, 0777) < 0) {
  22                 if (errno != EEXIST) {
  23                         perror(dir);
  24                         exit(1);
  25                 }
  26         }
  27         else if (share && adjust_shared_perm(dir))
  28                 die("Could not make %s writable by group\n", dir);
  29 }
  30
  31 static int copy_file(const char *dst, const char *src, int mode)
  32 {
  33         int fdi, fdo, status;
  34
  35         mode = (mode & 0111) ? 0777 : 0666;
  36         if ((fdi = open(src, O_RDONLY)) < 0)
  37                 return fdi;
  38         if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
  39                 close(fdi);
  40                 return fdo;
  41         }
  42         status = copy_fd(fdi, fdo);
  43         if (close(fdo) != 0)
  44                 return error("%s: write error: %s", dst, strerror(errno));
  45
  46         if (!status && adjust_shared_perm(dst))
  47                 return -1;
  48
  49         return status;
  50 }
  51
  52 static void copy_templates_1(char *path, int baselen,
  53                              char *template, int template_baselen,
  54                              DIR *dir)
  55 {
  56         struct dirent *de;
  57
  58         /* Note: if ".git/hooks" file exists in the repository being
  59          * re-initialized, /etc/core-git/templates/hooks/update would
  60          * cause git-init to fail here.  I think this is sane but
  61          * it means that the set of templates we ship by default, along
  62          * with the way the namespace under .git/ is organized, should
  63          * be really carefully chosen.
  64          */
  65         safe_create_dir(path, 1);
  66         while ((de = readdir(dir)) != NULL) {
  67                 struct stat st_git, st_template;
  68                 int namelen;
  69                 int exists = 0;
  70
  71                 if (de->d_name[0] == '.')
  72                         continue;
  73                 namelen = strlen(de->d_name);
  74                 if ((PATH_MAX <= baselen + namelen) ||
  75                     (PATH_MAX <= template_baselen + namelen))
  76                         die("insanely long template name %s", de->d_name);
  77                 memcpy(path + baselen, de->d_name, namelen+1);
  78                 memcpy(template + template_baselen, de->d_name, namelen+1);
  79                 if (lstat(path, &st_git)) {
  80                         if (errno != ENOENT)
  81                                 die("cannot stat %s", path);
  82                 }
  83                 else
  84                         exists = 1;
  85
  86                 if (lstat(template, &st_template))
  87                         die("cannot stat template %s", template);
  88
  89                 if (S_ISDIR(st_template.st_mode)) {
  90                         DIR *subdir = opendir(template);
  91                         int baselen_sub = baselen + namelen;
  92                         int template_baselen_sub = template_baselen + namelen;
  93                         if (!subdir)
  94                                 die("cannot opendir %s", template);
  95                         path[baselen_sub++] =
  96                                 template[template_baselen_sub++] = '/';
  97                         path[baselen_sub] =
  98                                 template[template_baselen_sub] = 0;
  99                         copy_templates_1(path, baselen_sub,
 100                                          template, template_baselen_sub,
 101                                          subdir);
 102                         closedir(subdir);
 103                 }
 104                 else if (exists)
 105                         continue;
 106                 else if (S_ISLNK(st_template.st_mode)) {
 107                         char lnk[256];
 108                         int len;
 109                         len = readlink(template, lnk, sizeof(lnk));
 110                         if (len < 0)
 111                                 die("cannot readlink %s", template);
 112                         if (sizeof(lnk) <= len)
 113                                 die("insanely long symlink %s", template);
 114                         lnk[len] = 0;
 115                         if (symlink(lnk, path))
 116                                 die("cannot symlink %s %s", lnk, path);
 117                 }
 118                 else if (S_ISREG(st_template.st_mode)) {
 119                         if (copy_file(path, template, st_template.st_mode))
 120                                 die("cannot copy %s to %s", template, path);
 121                 }
 122                 else
 123                         error("ignoring template %s", template);
 124         }
 125 }
 126
 127 static void copy_templates(const char *git_dir, int len, const char *template_dir)
 128 {
 129         char path[PATH_MAX];
 130         char template_path[PATH_MAX];
 131         int template_len;
 132         DIR *dir;
 133
 134         if (!template_dir) {
 135                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 136                 if (!template_dir)
 137                         template_dir = DEFAULT_GIT_TEMPLATE_DIR;
 138         }
 139         strcpy(template_path, template_dir);
 140         template_len = strlen(template_path);
 141         if (template_path[template_len-1] != '/') {
 142                 template_path[template_len++] = '/';
 143                 template_path[template_len] = 0;
 144         }
 145         dir = opendir(template_path);
 146         if (!dir) {
 147                 fprintf(stderr, "warning: templates not found %s\n",
 148                         template_dir);
 149                 return;
 150         }
 151
 152         /* Make sure that template is from the correct vintage */
 153         strcpy(template_path + template_len, "config");
 154         repository_format_version = 0;
 155         git_config_from_file(check_repository_format_version,
 156                              template_path);
 157         template_path[template_len] = 0;
 158
 159         if (repository_format_version &&
 160             repository_format_version != GIT_REPO_VERSION) {
 161                 fprintf(stderr, "warning: not copying templates of "
 162                         "a wrong format version %d from '%s'\n",
 163                         repository_format_version,
 164                         template_dir);
 165                 closedir(dir);
 166                 return;
 167         }
 168
 169         memcpy(path, git_dir, len);
 170         path[len] = 0;
 171         copy_templates_1(path, len,
 172                          template_path, template_len,
 173                          dir);
 174         closedir(dir);
 175 }
 176
 177 static int create_default_files(const char *git_dir, const char *template_path)
 178 {
 179         unsigned len = strlen(git_dir);
 180         static char path[PATH_MAX];
 181         unsigned char sha1[20];
 182         struct stat st1;
 183         char repo_version_string[10];
 184         int reinit;
 185         int filemode;
 186
 187         if (len > sizeof(path)-50)
 188                 die("insane git directory %s", git_dir);
 189         memcpy(path, git_dir, len);
 190
 191         if (len && path[len-1] != '/')
 192                 path[len++] = '/';
 193
 194         /*
 195          * Create .git/refs/{heads,tags}
 196          */
 197         strcpy(path + len, "refs");
 198         safe_create_dir(path, 1);
 199         strcpy(path + len, "refs/heads");
 200         safe_create_dir(path, 1);
 201         strcpy(path + len, "refs/tags");
 202         safe_create_dir(path, 1);
 203
 204         /* First copy the templates -- we might have the default
 205          * config file there, in which case we would want to read
 206          * from it after installing.
 207          */
 208         path[len] = 0;
 209         copy_templates(path, len, template_path);
 210
 211         git_config(git_default_config);
 212
 213         /*
 214          * We would have created the above under user's umask -- under
 215          * shared-repository settings, we would need to fix them up.
 216          */
 217         if (shared_repository) {
 218                 path[len] = 0;
 219                 adjust_shared_perm(path);
 220                 strcpy(path + len, "refs");
 221                 adjust_shared_perm(path);
 222                 strcpy(path + len, "refs/heads");
 223                 adjust_shared_perm(path);
 224                 strcpy(path + len, "refs/tags");
 225                 adjust_shared_perm(path);
 226         }
 227
 228         /*
 229          * Create the default symlink from ".git/HEAD" to the "master"
 230          * branch, if it does not exist yet.
 231          */
 232         strcpy(path + len, "HEAD");
 233         reinit = !read_ref("HEAD", sha1);
 234         if (!reinit) {
 235                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 236                         exit(1);
 237         }
 238
 239         /* This forces creation of new config file */
 240         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 241         git_config_set("core.repositoryformatversion", repo_version_string);
 242
 243         path[len] = 0;
 244         strcpy(path + len, "config");
 245
 246         /* Check filemode trustability */
 247         filemode = TEST_FILEMODE;
 248         if (TEST_FILEMODE && !lstat(path, &st1)) {
 249                 struct stat st2;
 250                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 251                                 !lstat(path, &st2) &&
 252                                 st1.st_mode != st2.st_mode);
 253         }
 254         git_config_set("core.filemode", filemode ? "true" : "false");
 255
 256         if (is_bare_repository())
 257                 git_config_set("core.bare", "true");
 258         else {
 259                 const char *work_tree = get_git_work_tree();
 260                 git_config_set("core.bare", "false");
 261                 /* allow template config file to override the default */
 262                 if (log_all_ref_updates == -1)
 263                     git_config_set("core.logallrefupdates", "true");
 264                 if (work_tree != git_work_tree_cfg)
 265                         git_config_set("core.worktree", work_tree);
 266         }
 267
 268         /* Check if symlink is supported in the work tree */
 269         if (!reinit) {
 270                 path[len] = 0;
 271                 strcpy(path + len, "tXXXXXX");
 272                 if (!close(xmkstemp(path)) &&
 273                     !unlink(path) &&
 274                     !symlink("testing", path) &&
 275                     !lstat(path, &st1) &&
 276                     S_ISLNK(st1.st_mode))
 277                         unlink(path); /* good */
 278                 else
 279                         git_config_set("core.symlinks", "false");
 280         }
 281
 282         return reinit;
 283 }
 284
 285 static void guess_repository_type(const char *git_dir)
 286 {
 287         char cwd[PATH_MAX];
 288         const char *slash;
 289
 290         if (0 <= is_bare_repository_cfg)
 291                 return;
 292         if (!git_dir)
 293                 return;
 294
 295         /*
 296          * "GIT_DIR=. git init" is always bare.
 297          * "GIT_DIR=`pwd` git init" too.
 298          */
 299         if (!strcmp(".", git_dir))
 300                 goto force_bare;
 301         if (!getcwd(cwd, sizeof(cwd)))
 302                 die("cannot tell cwd");
 303         if (!strcmp(git_dir, cwd))
 304                 goto force_bare;
 305         /*
 306          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 307          */
 308         if (!strcmp(git_dir, ".git"))
 309                 return;
 310         slash = strrchr(git_dir, '/');
 311         if (slash && !strcmp(slash, "/.git"))
 312                 return;
 313
 314         /*
 315          * Otherwise it is often bare.  At this point
 316          * we are just guessing.
 317          */
 318  force_bare:
 319         is_bare_repository_cfg = 1;
 320         return;
 321 }
 322
 323 static const char init_db_usage[] =
 324 "git-init [-q | --quiet] [--template=<template-directory>] [--shared]";
 325
 326 /*
 327  * If you want to, you can share the DB area with any number of branches.
 328  * That has advantages: you can save space by sharing all the SHA1 objects.
 329  * On the other hand, it might just make lookup slower and messier. You
 330  * be the judge.  The default case is to have one DB per managed directory.
 331  */
 332 int cmd_init_db(int argc, const char **argv, const char *prefix)
 333 {
 334         const char *git_dir;
 335         const char *sha1_dir;
 336         const char *template_dir = NULL;
 337         char *path;
 338         int len, i, reinit;
 339         int quiet = 0;
 340
 341         for (i = 1; i < argc; i++, argv++) {
 342                 const char *arg = argv[1];
 343                 if (!prefixcmp(arg, "--template="))
 344                         template_dir = arg+11;
 345                 else if (!strcmp(arg, "--shared"))
 346                         shared_repository = PERM_GROUP;
 347                 else if (!prefixcmp(arg, "--shared="))
 348                         shared_repository = git_config_perm("arg", arg+9);
 349                 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
 350                         quiet = 1;
 351                 else
 352                         usage(init_db_usage);
 353         }
 354
 355         /*
 356          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 357          * without --bare.  Catch the error early.
 358          */
 359         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 360         if ((!git_dir || is_bare_repository_cfg == 1)
 361             && getenv(GIT_WORK_TREE_ENVIRONMENT))
 362                 die("%s (or --work-tree=<directory>) not allowed without "
 363                     "specifying %s (or --git-dir=<directory>)",
 364                     GIT_WORK_TREE_ENVIRONMENT,
 365                     GIT_DIR_ENVIRONMENT);
 366
 367         guess_repository_type(git_dir);
 368
 369         if (is_bare_repository_cfg <= 0) {
 370                 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
 371                 if (!getcwd(git_work_tree_cfg, PATH_MAX))
 372                         die ("Cannot access current working directory.");
 373                 if (access(get_git_work_tree(), X_OK))
 374                         die ("Cannot access work tree '%s'",
 375                              get_git_work_tree());
 376         }
 377
 378         /*
 379          * Set up the default .git directory contents
 380          */
 381         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 382         if (!git_dir)
 383                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 384         safe_create_dir(git_dir, 0);
 385
 386         /* Check to see if the repository version is right.
 387          * Note that a newly created repository does not have
 388          * config file, so this will not fail.  What we are catching
 389          * is an attempt to reinitialize new repository with an old tool.
 390          */
 391         check_repository_format();
 392
 393         reinit = create_default_files(git_dir, template_dir);
 394
 395         /*
 396          * And set up the object store.
 397          */
 398         sha1_dir = get_object_directory();
 399         len = strlen(sha1_dir);
 400         path = xmalloc(len + 40);
 401         memcpy(path, sha1_dir, len);
 402
 403         safe_create_dir(sha1_dir, 1);
 404         strcpy(path+len, "/pack");
 405         safe_create_dir(path, 1);
 406         strcpy(path+len, "/info");
 407         safe_create_dir(path, 1);
 408
 409         if (shared_repository) {
 410                 char buf[10];
 411                 /* We do not spell "group" and such, so that
 412                  * the configuration can be read by older version
 413                  * of git.
 414                  */
 415                 sprintf(buf, "%d", shared_repository);
 416                 git_config_set("core.sharedrepository", buf);
 417                 git_config_set("receive.denyNonFastforwards", "true");
 418         }
 419
 420         if (!quiet)
 421                 printf("%s%s Git repository in %s/\n",
 422                        reinit ? "Reinitialized existing" : "Initialized empty",
 423                        shared_repository ? " shared" : "",
 424                        git_dir);
 425
 426         return 0;
 427 }