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 int copy_file(const char *dst, const char *src, int mode)
  33 {
  34         int fdi, fdo, status;
  35
  36         mode = (mode & 0111) ? 0777 : 0666;
  37         if ((fdi = open(src, O_RDONLY)) < 0)
  38                 return fdi;
  39         if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
  40                 close(fdi);
  41                 return fdo;
  42         }
  43         status = copy_fd(fdi, fdo);
  44         if (close(fdo) != 0)
  45                 return error("%s: write error: %s", dst, strerror(errno));
  46
  47         if (!status && adjust_shared_perm(dst))
  48                 return -1;
  49
  50         return status;
  51 }
  52
  53 static void copy_templates_1(char *path, int baselen,
  54                              char *template, int template_baselen,
  55                              DIR *dir)
  56 {
  57         struct dirent *de;
  58
  59         /* Note: if ".git/hooks" file exists in the repository being
  60          * re-initialized, /etc/core-git/templates/hooks/update would
  61          * cause git-init to fail here.  I think this is sane but
  62          * it means that the set of templates we ship by default, along
  63          * with the way the namespace under .git/ is organized, should
  64          * be really carefully chosen.
  65          */
  66         safe_create_dir(path, 1);
  67         while ((de = readdir(dir)) != NULL) {
  68                 struct stat st_git, st_template;
  69                 int namelen;
  70                 int exists = 0;
  71
  72                 if (de->d_name[0] == '.')
  73                         continue;
  74                 namelen = strlen(de->d_name);
  75                 if ((PATH_MAX <= baselen + namelen) ||
  76                     (PATH_MAX <= template_baselen + namelen))
  77                         die("insanely long template name %s", de->d_name);
  78                 memcpy(path + baselen, de->d_name, namelen+1);
  79                 memcpy(template + template_baselen, de->d_name, namelen+1);
  80                 if (lstat(path, &st_git)) {
  81                         if (errno != ENOENT)
  82                                 die("cannot stat %s", path);
  83                 }
  84                 else
  85                         exists = 1;
  86
  87                 if (lstat(template, &st_template))
  88                         die("cannot stat template %s", template);
  89
  90                 if (S_ISDIR(st_template.st_mode)) {
  91                         DIR *subdir = opendir(template);
  92                         int baselen_sub = baselen + namelen;
  93                         int template_baselen_sub = template_baselen + namelen;
  94                         if (!subdir)
  95                                 die("cannot opendir %s", template);
  96                         path[baselen_sub++] =
  97                                 template[template_baselen_sub++] = '/';
  98                         path[baselen_sub] =
  99                                 template[template_baselen_sub] = 0;
 100                         copy_templates_1(path, baselen_sub,
 101                                          template, template_baselen_sub,
 102                                          subdir);
 103                         closedir(subdir);
 104                 }
 105                 else if (exists)
 106                         continue;
 107                 else if (S_ISLNK(st_template.st_mode)) {
 108                         char lnk[256];
 109                         int len;
 110                         len = readlink(template, lnk, sizeof(lnk));
 111                         if (len < 0)
 112                                 die("cannot readlink %s", template);
 113                         if (sizeof(lnk) <= len)
 114                                 die("insanely long symlink %s", template);
 115                         lnk[len] = 0;
 116                         if (symlink(lnk, path))
 117                                 die("cannot symlink %s %s", lnk, path);
 118                 }
 119                 else if (S_ISREG(st_template.st_mode)) {
 120                         if (copy_file(path, template, st_template.st_mode))
 121                                 die("cannot copy %s to %s", template, path);
 122                 }
 123                 else
 124                         error("ignoring template %s", template);
 125         }
 126 }
 127
 128 static void copy_templates(const char *git_dir, int len, const char *template_dir)
 129 {
 130         char path[PATH_MAX];
 131         char template_path[PATH_MAX];
 132         int template_len;
 133         DIR *dir;
 134
 135         if (!template_dir)
 136                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 137         if (!template_dir) {
 138                 /*
 139                  * if the hard-coded template is relative, it is
 140                  * interpreted relative to the exec_dir
 141                  */
 142                 template_dir = DEFAULT_GIT_TEMPLATE_DIR;
 143                 if (!is_absolute_path(template_dir)) {
 144                         const char *exec_path = git_exec_path();
 145                         template_dir = prefix_filename(exec_path, strlen(exec_path), template_dir);
 146                 }
 147         }
 148         strcpy(template_path, template_dir);
 149         template_len = strlen(template_path);
 150         if (template_path[template_len-1] != '/') {
 151                 template_path[template_len++] = '/';
 152                 template_path[template_len] = 0;
 153         }
 154         dir = opendir(template_path);
 155         if (!dir) {
 156                 fprintf(stderr, "warning: templates not found %s\n",
 157                         template_dir);
 158                 return;
 159         }
 160
 161         /* Make sure that template is from the correct vintage */
 162         strcpy(template_path + template_len, "config");
 163         repository_format_version = 0;
 164         git_config_from_file(check_repository_format_version,
 165                              template_path);
 166         template_path[template_len] = 0;
 167
 168         if (repository_format_version &&
 169             repository_format_version != GIT_REPO_VERSION) {
 170                 fprintf(stderr, "warning: not copying templates of "
 171                         "a wrong format version %d from '%s'\n",
 172                         repository_format_version,
 173                         template_dir);
 174                 closedir(dir);
 175                 return;
 176         }
 177
 178         memcpy(path, git_dir, len);
 179         path[len] = 0;
 180         copy_templates_1(path, len,
 181                          template_path, template_len,
 182                          dir);
 183         closedir(dir);
 184 }
 185
 186 static int create_default_files(const char *git_dir, const char *template_path)
 187 {
 188         unsigned len = strlen(git_dir);
 189         static char path[PATH_MAX];
 190         unsigned char sha1[20];
 191         struct stat st1;
 192         char repo_version_string[10];
 193         int reinit;
 194         int filemode;
 195
 196         if (len > sizeof(path)-50)
 197                 die("insane git directory %s", git_dir);
 198         memcpy(path, git_dir, len);
 199
 200         if (len && path[len-1] != '/')
 201                 path[len++] = '/';
 202
 203         /*
 204          * Create .git/refs/{heads,tags}
 205          */
 206         strcpy(path + len, "refs");
 207         safe_create_dir(path, 1);
 208         strcpy(path + len, "refs/heads");
 209         safe_create_dir(path, 1);
 210         strcpy(path + len, "refs/tags");
 211         safe_create_dir(path, 1);
 212
 213         /* First copy the templates -- we might have the default
 214          * config file there, in which case we would want to read
 215          * from it after installing.
 216          */
 217         path[len] = 0;
 218         copy_templates(path, len, template_path);
 219
 220         git_config(git_default_config);
 221
 222         /*
 223          * We would have created the above under user's umask -- under
 224          * shared-repository settings, we would need to fix them up.
 225          */
 226         if (shared_repository) {
 227                 path[len] = 0;
 228                 adjust_shared_perm(path);
 229                 strcpy(path + len, "refs");
 230                 adjust_shared_perm(path);
 231                 strcpy(path + len, "refs/heads");
 232                 adjust_shared_perm(path);
 233                 strcpy(path + len, "refs/tags");
 234                 adjust_shared_perm(path);
 235         }
 236
 237         /*
 238          * Create the default symlink from ".git/HEAD" to the "master"
 239          * branch, if it does not exist yet.
 240          */
 241         strcpy(path + len, "HEAD");
 242         reinit = !read_ref("HEAD", sha1);
 243         if (!reinit) {
 244                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 245                         exit(1);
 246         }
 247
 248         /* This forces creation of new config file */
 249         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 250         git_config_set("core.repositoryformatversion", repo_version_string);
 251
 252         path[len] = 0;
 253         strcpy(path + len, "config");
 254
 255         /* Check filemode trustability */
 256         filemode = TEST_FILEMODE;
 257         if (TEST_FILEMODE && !lstat(path, &st1)) {
 258                 struct stat st2;
 259                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 260                                 !lstat(path, &st2) &&
 261                                 st1.st_mode != st2.st_mode);
 262         }
 263         git_config_set("core.filemode", filemode ? "true" : "false");
 264
 265         if (is_bare_repository())
 266                 git_config_set("core.bare", "true");
 267         else {
 268                 const char *work_tree = get_git_work_tree();
 269                 git_config_set("core.bare", "false");
 270                 /* allow template config file to override the default */
 271                 if (log_all_ref_updates == -1)
 272                     git_config_set("core.logallrefupdates", "true");
 273                 if (work_tree != git_work_tree_cfg)
 274                         git_config_set("core.worktree", work_tree);
 275         }
 276
 277         /* Check if symlink is supported in the work tree */
 278         if (!reinit) {
 279                 path[len] = 0;
 280                 strcpy(path + len, "tXXXXXX");
 281                 if (!close(xmkstemp(path)) &&
 282                     !unlink(path) &&
 283                     !symlink("testing", path) &&
 284                     !lstat(path, &st1) &&
 285                     S_ISLNK(st1.st_mode))
 286                         unlink(path); /* good */
 287                 else
 288                         git_config_set("core.symlinks", "false");
 289         }
 290
 291         return reinit;
 292 }
 293
 294 static void guess_repository_type(const char *git_dir)
 295 {
 296         char cwd[PATH_MAX];
 297         const char *slash;
 298
 299         if (0 <= is_bare_repository_cfg)
 300                 return;
 301         if (!git_dir)
 302                 return;
 303
 304         /*
 305          * "GIT_DIR=. git init" is always bare.
 306          * "GIT_DIR=`pwd` git init" too.
 307          */
 308         if (!strcmp(".", git_dir))
 309                 goto force_bare;
 310         if (!getcwd(cwd, sizeof(cwd)))
 311                 die("cannot tell cwd");
 312         if (!strcmp(git_dir, cwd))
 313                 goto force_bare;
 314         /*
 315          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 316          */
 317         if (!strcmp(git_dir, ".git"))
 318                 return;
 319         slash = strrchr(git_dir, '/');
 320         if (slash && !strcmp(slash, "/.git"))
 321                 return;
 322
 323         /*
 324          * Otherwise it is often bare.  At this point
 325          * we are just guessing.
 326          */
 327  force_bare:
 328         is_bare_repository_cfg = 1;
 329         return;
 330 }
 331
 332 static const char init_db_usage[] =
 333 "git-init [-q | --quiet] [--template=<template-directory>] [--shared]";
 334
 335 /*
 336  * If you want to, you can share the DB area with any number of branches.
 337  * That has advantages: you can save space by sharing all the SHA1 objects.
 338  * On the other hand, it might just make lookup slower and messier. You
 339  * be the judge.  The default case is to have one DB per managed directory.
 340  */
 341 int cmd_init_db(int argc, const char **argv, const char *prefix)
 342 {
 343         const char *git_dir;
 344         const char *sha1_dir;
 345         const char *template_dir = NULL;
 346         char *path;
 347         int len, i, reinit;
 348         int quiet = 0;
 349
 350         for (i = 1; i < argc; i++, argv++) {
 351                 const char *arg = argv[1];
 352                 if (!prefixcmp(arg, "--template="))
 353                         template_dir = arg+11;
 354                 else if (!strcmp(arg, "--shared"))
 355                         shared_repository = PERM_GROUP;
 356                 else if (!prefixcmp(arg, "--shared="))
 357                         shared_repository = git_config_perm("arg", arg+9);
 358                 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
 359                         quiet = 1;
 360                 else
 361                         usage(init_db_usage);
 362         }
 363
 364         /*
 365          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 366          * without --bare.  Catch the error early.
 367          */
 368         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 369         if ((!git_dir || is_bare_repository_cfg == 1)
 370             && getenv(GIT_WORK_TREE_ENVIRONMENT))
 371                 die("%s (or --work-tree=<directory>) not allowed without "
 372                     "specifying %s (or --git-dir=<directory>)",
 373                     GIT_WORK_TREE_ENVIRONMENT,
 374                     GIT_DIR_ENVIRONMENT);
 375
 376         guess_repository_type(git_dir);
 377
 378         if (is_bare_repository_cfg <= 0) {
 379                 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
 380                 if (!getcwd(git_work_tree_cfg, PATH_MAX))
 381                         die ("Cannot access current working directory.");
 382                 if (access(get_git_work_tree(), X_OK))
 383                         die ("Cannot access work tree '%s'",
 384                              get_git_work_tree());
 385         }
 386
 387         /*
 388          * Set up the default .git directory contents
 389          */
 390         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 391         if (!git_dir)
 392                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 393         safe_create_dir(git_dir, 0);
 394
 395         /* Check to see if the repository version is right.
 396          * Note that a newly created repository does not have
 397          * config file, so this will not fail.  What we are catching
 398          * is an attempt to reinitialize new repository with an old tool.
 399          */
 400         check_repository_format();
 401
 402         reinit = create_default_files(git_dir, template_dir);
 403
 404         /*
 405          * And set up the object store.
 406          */
 407         sha1_dir = get_object_directory();
 408         len = strlen(sha1_dir);
 409         path = xmalloc(len + 40);
 410         memcpy(path, sha1_dir, len);
 411
 412         safe_create_dir(sha1_dir, 1);
 413         strcpy(path+len, "/pack");
 414         safe_create_dir(path, 1);
 415         strcpy(path+len, "/info");
 416         safe_create_dir(path, 1);
 417
 418         if (shared_repository) {
 419                 char buf[10];
 420                 /* We do not spell "group" and such, so that
 421                  * the configuration can be read by older version
 422                  * of git.
 423                  */
 424                 sprintf(buf, "%d", shared_repository);
 425                 git_config_set("core.sharedrepository", buf);
 426                 git_config_set("receive.denyNonFastforwards", "true");
 427         }
 428
 429         if (!quiet)
 430                 printf("%s%s Git repository in %s/\n",
 431                        reinit ? "Reinitialized existing" : "Initialized empty",
 432                        shared_repository ? " shared" : "",
 433                        git_dir);
 434
 435         return 0;
 436 }