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 #include "parse-options.h"
  10
  11 #ifndef DEFAULT_GIT_TEMPLATE_DIR
  12 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
  13 #endif
  14
  15 #ifdef NO_TRUSTABLE_FILEMODE
  16 #define TEST_FILEMODE 0
  17 #else
  18 #define TEST_FILEMODE 1
  19 #endif
  20
  21 static int init_is_bare_repository = 0;
  22 static int init_shared_repository = -1;
  23 static const char *init_db_template_dir;
  24
  25 static void safe_create_dir(const char *dir, int share)
  26 {
  27         if (mkdir(dir, 0777) < 0) {
  28                 if (errno != EEXIST) {
  29                         perror(dir);
  30                         exit(1);
  31                 }
  32         }
  33         else if (share && adjust_shared_perm(dir))
  34                 die("Could not make %s writable by group", dir);
  35 }
  36
  37 static void copy_templates_1(char *path, int baselen,
  38                              char *template, int template_baselen,
  39                              DIR *dir)
  40 {
  41         struct dirent *de;
  42
  43         /* Note: if ".git/hooks" file exists in the repository being
  44          * re-initialized, /etc/core-git/templates/hooks/update would
  45          * cause "git init" to fail here.  I think this is sane but
  46          * it means that the set of templates we ship by default, along
  47          * with the way the namespace under .git/ is organized, should
  48          * be really carefully chosen.
  49          */
  50         safe_create_dir(path, 1);
  51         while ((de = readdir(dir)) != NULL) {
  52                 struct stat st_git, st_template;
  53                 int namelen;
  54                 int exists = 0;
  55
  56                 if (de->d_name[0] == '.')
  57                         continue;
  58                 namelen = strlen(de->d_name);
  59                 if ((PATH_MAX <= baselen + namelen) ||
  60                     (PATH_MAX <= template_baselen + namelen))
  61                         die("insanely long template name %s", de->d_name);
  62                 memcpy(path + baselen, de->d_name, namelen+1);
  63                 memcpy(template + template_baselen, de->d_name, namelen+1);
  64                 if (lstat(path, &st_git)) {
  65                         if (errno != ENOENT)
  66                                 die_errno("cannot stat '%s'", path);
  67                 }
  68                 else
  69                         exists = 1;
  70
  71                 if (lstat(template, &st_template))
  72                         die_errno("cannot stat template '%s'", template);
  73
  74                 if (S_ISDIR(st_template.st_mode)) {
  75                         DIR *subdir = opendir(template);
  76                         int baselen_sub = baselen + namelen;
  77                         int template_baselen_sub = template_baselen + namelen;
  78                         if (!subdir)
  79                                 die_errno("cannot opendir '%s'", template);
  80                         path[baselen_sub++] =
  81                                 template[template_baselen_sub++] = '/';
  82                         path[baselen_sub] =
  83                                 template[template_baselen_sub] = 0;
  84                         copy_templates_1(path, baselen_sub,
  85                                          template, template_baselen_sub,
  86                                          subdir);
  87                         closedir(subdir);
  88                 }
  89                 else if (exists)
  90                         continue;
  91                 else if (S_ISLNK(st_template.st_mode)) {
  92                         char lnk[256];
  93                         int len;
  94                         len = readlink(template, lnk, sizeof(lnk));
  95                         if (len < 0)
  96                                 die_errno("cannot readlink '%s'", template);
  97                         if (sizeof(lnk) <= len)
  98                                 die("insanely long symlink %s", template);
  99                         lnk[len] = 0;
 100                         if (symlink(lnk, path))
 101                                 die_errno("cannot symlink '%s' '%s'", lnk, path);
 102                 }
 103                 else if (S_ISREG(st_template.st_mode)) {
 104                         if (copy_file(path, template, st_template.st_mode))
 105                                 die_errno("cannot copy '%s' to '%s'", template,
 106                                           path);
 107                 }
 108                 else
 109                         error("ignoring template %s", template);
 110         }
 111 }
 112
 113 static void copy_templates(const char *template_dir)
 114 {
 115         char path[PATH_MAX];
 116         char template_path[PATH_MAX];
 117         int template_len;
 118         DIR *dir;
 119         const char *git_dir = get_git_dir();
 120         int len = strlen(git_dir);
 121
 122         if (!template_dir)
 123                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 124         if (!template_dir)
 125                 template_dir = init_db_template_dir;
 126         if (!template_dir)
 127                 template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 128         if (!template_dir[0])
 129                 return;
 130         template_len = strlen(template_dir);
 131         if (PATH_MAX <= (template_len+strlen("/config")))
 132                 die("insanely long template path %s", template_dir);
 133         strcpy(template_path, template_dir);
 134         if (template_path[template_len-1] != '/') {
 135                 template_path[template_len++] = '/';
 136                 template_path[template_len] = 0;
 137         }
 138         dir = opendir(template_path);
 139         if (!dir) {
 140                 warning("templates not found %s", template_dir);
 141                 return;
 142         }
 143
 144         /* Make sure that template is from the correct vintage */
 145         strcpy(template_path + template_len, "config");
 146         repository_format_version = 0;
 147         git_config_from_file(check_repository_format_version,
 148                              template_path, NULL);
 149         template_path[template_len] = 0;
 150
 151         if (repository_format_version &&
 152             repository_format_version != GIT_REPO_VERSION) {
 153                 warning("not copying templates of "
 154                         "a wrong format version %d from '%s'",
 155                         repository_format_version,
 156                         template_dir);
 157                 closedir(dir);
 158                 return;
 159         }
 160
 161         memcpy(path, git_dir, len);
 162         if (len && path[len - 1] != '/')
 163                 path[len++] = '/';
 164         path[len] = 0;
 165         copy_templates_1(path, len,
 166                          template_path, template_len,
 167                          dir);
 168         closedir(dir);
 169 }
 170
 171 static int git_init_db_config(const char *k, const char *v, void *cb)
 172 {
 173         if (!strcmp(k, "init.templatedir"))
 174                 return git_config_pathname(&init_db_template_dir, k, v);
 175
 176         return 0;
 177 }
 178
 179 static int create_default_files(const char *template_path)
 180 {
 181         const char *git_dir = get_git_dir();
 182         unsigned len = strlen(git_dir);
 183         static char path[PATH_MAX];
 184         struct stat st1;
 185         char repo_version_string[10];
 186         char junk[2];
 187         int reinit;
 188         int filemode;
 189
 190         if (len > sizeof(path)-50)
 191                 die("insane git directory %s", git_dir);
 192         memcpy(path, git_dir, len);
 193
 194         if (len && path[len-1] != '/')
 195                 path[len++] = '/';
 196
 197         /*
 198          * Create .git/refs/{heads,tags}
 199          */
 200         safe_create_dir(git_path("refs"), 1);
 201         safe_create_dir(git_path("refs/heads"), 1);
 202         safe_create_dir(git_path("refs/tags"), 1);
 203
 204         /* Just look for `init.templatedir` */
 205         git_config(git_init_db_config, NULL);
 206
 207         /* First copy the templates -- we might have the default
 208          * config file there, in which case we would want to read
 209          * from it after installing.
 210          */
 211         copy_templates(template_path);
 212
 213         git_config(git_default_config, NULL);
 214         is_bare_repository_cfg = init_is_bare_repository;
 215
 216         /* reading existing config may have overwrote it */
 217         if (init_shared_repository != -1)
 218                 shared_repository = init_shared_repository;
 219
 220         /*
 221          * We would have created the above under user's umask -- under
 222          * shared-repository settings, we would need to fix them up.
 223          */
 224         if (shared_repository) {
 225                 adjust_shared_perm(get_git_dir());
 226                 adjust_shared_perm(git_path("refs"));
 227                 adjust_shared_perm(git_path("refs/heads"));
 228                 adjust_shared_perm(git_path("refs/tags"));
 229         }
 230
 231         /*
 232          * Create the default symlink from ".git/HEAD" to the "master"
 233          * branch, if it does not exist yet.
 234          */
 235         strcpy(path + len, "HEAD");
 236         reinit = (!access(path, R_OK)
 237                   || readlink(path, junk, sizeof(junk)-1) != -1);
 238         if (!reinit) {
 239                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 240                         exit(1);
 241         }
 242
 243         /* This forces creation of new config file */
 244         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 245         git_config_set("core.repositoryformatversion", repo_version_string);
 246
 247         path[len] = 0;
 248         strcpy(path + len, "config");
 249
 250         /* Check filemode trustability */
 251         filemode = TEST_FILEMODE;
 252         if (TEST_FILEMODE && !lstat(path, &st1)) {
 253                 struct stat st2;
 254                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 255                                 !lstat(path, &st2) &&
 256                                 st1.st_mode != st2.st_mode);
 257         }
 258         git_config_set("core.filemode", filemode ? "true" : "false");
 259
 260         if (is_bare_repository())
 261                 git_config_set("core.bare", "true");
 262         else {
 263                 const char *work_tree = get_git_work_tree();
 264                 git_config_set("core.bare", "false");
 265                 /* allow template config file to override the default */
 266                 if (log_all_ref_updates == -1)
 267                     git_config_set("core.logallrefupdates", "true");
 268                 if (prefixcmp(git_dir, work_tree) ||
 269                     strcmp(git_dir + strlen(work_tree), "/.git")) {
 270                         git_config_set("core.worktree", work_tree);
 271                 }
 272         }
 273
 274         if (!reinit) {
 275                 /* Check if symlink is supported in the work tree */
 276                 path[len] = 0;
 277                 strcpy(path + len, "tXXXXXX");
 278                 if (!close(xmkstemp(path)) &&
 279                     !unlink(path) &&
 280                     !symlink("testing", path) &&
 281                     !lstat(path, &st1) &&
 282                     S_ISLNK(st1.st_mode))
 283                         unlink(path); /* good */
 284                 else
 285                         git_config_set("core.symlinks", "false");
 286
 287                 /* Check if the filesystem is case-insensitive */
 288                 path[len] = 0;
 289                 strcpy(path + len, "CoNfIg");
 290                 if (!access(path, F_OK))
 291                         git_config_set("core.ignorecase", "true");
 292         }
 293
 294         return reinit;
 295 }
 296
 297 int init_db(const char *template_dir, unsigned int flags)
 298 {
 299         const char *sha1_dir;
 300         char *path;
 301         int len, reinit;
 302
 303         safe_create_dir(get_git_dir(), 0);
 304
 305         init_is_bare_repository = is_bare_repository();
 306
 307         /* Check to see if the repository version is right.
 308          * Note that a newly created repository does not have
 309          * config file, so this will not fail.  What we are catching
 310          * is an attempt to reinitialize new repository with an old tool.
 311          */
 312         check_repository_format();
 313
 314         reinit = create_default_files(template_dir);
 315
 316         sha1_dir = get_object_directory();
 317         len = strlen(sha1_dir);
 318         path = xmalloc(len + 40);
 319         memcpy(path, sha1_dir, len);
 320
 321         safe_create_dir(sha1_dir, 1);
 322         strcpy(path+len, "/pack");
 323         safe_create_dir(path, 1);
 324         strcpy(path+len, "/info");
 325         safe_create_dir(path, 1);
 326
 327         if (shared_repository) {
 328                 char buf[10];
 329                 /* We do not spell "group" and such, so that
 330                  * the configuration can be read by older version
 331                  * of git. Note, we use octal numbers for new share modes,
 332                  * and compatibility values for PERM_GROUP and
 333                  * PERM_EVERYBODY.
 334                  */
 335                 if (shared_repository < 0)
 336                         /* force to the mode value */
 337                         sprintf(buf, "0%o", -shared_repository);
 338                 else if (shared_repository == PERM_GROUP)
 339                         sprintf(buf, "%d", OLD_PERM_GROUP);
 340                 else if (shared_repository == PERM_EVERYBODY)
 341                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
 342                 else
 343                         die("oops");
 344                 git_config_set("core.sharedrepository", buf);
 345                 git_config_set("receive.denyNonFastforwards", "true");
 346         }
 347
 348         if (!(flags & INIT_DB_QUIET)) {
 349                 const char *git_dir = get_git_dir();
 350                 int len = strlen(git_dir);
 351                 printf("%s%s Git repository in %s%s\n",
 352                        reinit ? "Reinitialized existing" : "Initialized empty",
 353                        shared_repository ? " shared" : "",
 354                        git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 355         }
 356
 357         return 0;
 358 }
 359
 360 static int guess_repository_type(const char *git_dir)
 361 {
 362         char cwd[PATH_MAX];
 363         const char *slash;
 364
 365         /*
 366          * "GIT_DIR=. git init" is always bare.
 367          * "GIT_DIR=`pwd` git init" too.
 368          */
 369         if (!strcmp(".", git_dir))
 370                 return 1;
 371         if (!getcwd(cwd, sizeof(cwd)))
 372                 die_errno("cannot tell cwd");
 373         if (!strcmp(git_dir, cwd))
 374                 return 1;
 375         /*
 376          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 377          */
 378         if (!strcmp(git_dir, ".git"))
 379                 return 0;
 380         slash = strrchr(git_dir, '/');
 381         if (slash && !strcmp(slash, "/.git"))
 382                 return 0;
 383
 384         /*
 385          * Otherwise it is often bare.  At this point
 386          * we are just guessing.
 387          */
 388         return 1;
 389 }
 390
 391 static int shared_callback(const struct option *opt, const char *arg, int unset)
 392 {
 393         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 394         return 0;
 395 }
 396
 397 static const char *const init_db_usage[] = {
 398         "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]",
 399         NULL
 400 };
 401
 402 /*
 403  * If you want to, you can share the DB area with any number of branches.
 404  * That has advantages: you can save space by sharing all the SHA1 objects.
 405  * On the other hand, it might just make lookup slower and messier. You
 406  * be the judge.  The default case is to have one DB per managed directory.
 407  */
 408 int cmd_init_db(int argc, const char **argv, const char *prefix)
 409 {
 410         const char *git_dir;
 411         const char *template_dir = NULL;
 412         unsigned int flags = 0;
 413         const struct option init_db_options[] = {
 414                 OPT_STRING(0, "template", &template_dir, "template-directory",
 415                                 "provide the directory from which templates will be used"),
 416                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 417                                 "create a bare repository", 1),
 418                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 419                         "permissions",
 420                         "specify that the git repository is to be shared amongst several users",
 421                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 422                 OPT_BIT('q', "quiet", &flags, "be quiet", INIT_DB_QUIET),
 423                 OPT_END()
 424         };
 425
 426         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 427
 428         if (argc == 1) {
 429                 int mkdir_tried = 0;
 430         retry:
 431                 if (chdir(argv[0]) < 0) {
 432                         if (!mkdir_tried) {
 433                                 int saved;
 434                                 /*
 435                                  * At this point we haven't read any configuration,
 436                                  * and we know shared_repository should always be 0;
 437                                  * but just in case we play safe.
 438                                  */
 439                                 saved = shared_repository;
 440                                 shared_repository = 0;
 441                                 switch (safe_create_leading_directories_const(argv[0])) {
 442                                 case -3:
 443                                         errno = EEXIST;
 444                                         /* fallthru */
 445                                 case -1:
 446                                         die_errno("cannot mkdir %s", argv[0]);
 447                                         break;
 448                                 default:
 449                                         break;
 450                                 }
 451                                 shared_repository = saved;
 452                                 if (mkdir(argv[0], 0777) < 0)
 453                                         die_errno("cannot mkdir %s", argv[0]);
 454                                 mkdir_tried = 1;
 455                                 goto retry;
 456                         }
 457                         die_errno("cannot chdir to %s", argv[0]);
 458                 }
 459         } else if (0 < argc) {
 460                 usage(init_db_usage[0]);
 461         }
 462         if (is_bare_repository_cfg == 1) {
 463                 static char git_dir[PATH_MAX+1];
 464
 465                 setenv(GIT_DIR_ENVIRONMENT,
 466                         getcwd(git_dir, sizeof(git_dir)), argc > 0);
 467         }
 468
 469         if (init_shared_repository != -1)
 470                 shared_repository = init_shared_repository;
 471
 472         /*
 473          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 474          * without --bare.  Catch the error early.
 475          */
 476         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 477         if ((!git_dir || is_bare_repository_cfg == 1)
 478             && getenv(GIT_WORK_TREE_ENVIRONMENT))
 479                 die("%s (or --work-tree=<directory>) not allowed without "
 480                     "specifying %s (or --git-dir=<directory>)",
 481                     GIT_WORK_TREE_ENVIRONMENT,
 482                     GIT_DIR_ENVIRONMENT);
 483
 484         /*
 485          * Set up the default .git directory contents
 486          */
 487         if (!git_dir)
 488                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 489
 490         if (is_bare_repository_cfg < 0)
 491                 is_bare_repository_cfg = guess_repository_type(git_dir);
 492
 493         if (!is_bare_repository_cfg) {
 494                 if (git_dir) {
 495                         const char *git_dir_parent = strrchr(git_dir, '/');
 496                         if (git_dir_parent) {
 497                                 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 498                                 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
 499                                 free(rel);
 500                         }
 501                 }
 502                 if (!git_work_tree_cfg) {
 503                         git_work_tree_cfg = xcalloc(PATH_MAX, 1);
 504                         if (!getcwd(git_work_tree_cfg, PATH_MAX))
 505                                 die_errno ("Cannot access current working directory");
 506                 }
 507                 if (access(get_git_work_tree(), X_OK))
 508                         die_errno ("Cannot access work tree '%s'",
 509                                    get_git_work_tree());
 510         }
 511
 512         set_git_dir(make_absolute_path(git_dir));
 513
 514         return init_db(template_dir, flags);
 515 }