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 static const char *git_link;
  25
  26 static void safe_create_dir(const char *dir, int share)
  27 {
  28         if (mkdir(dir, 0777) < 0) {
  29                 if (errno != EEXIST) {
  30                         perror(dir);
  31                         exit(1);
  32                 }
  33         }
  34         else if (share && adjust_shared_perm(dir))
  35                 die(_("Could not make %s writable by group"), dir);
  36 }
  37
  38 static void copy_templates_1(char *path, int baselen,
  39                              char *template, int template_baselen,
  40                              DIR *dir)
  41 {
  42         struct dirent *de;
  43
  44         /* Note: if ".git/hooks" file exists in the repository being
  45          * re-initialized, /etc/core-git/templates/hooks/update would
  46          * cause "git init" to fail here.  I think this is sane but
  47          * it means that the set of templates we ship by default, along
  48          * with the way the namespace under .git/ is organized, should
  49          * be really carefully chosen.
  50          */
  51         safe_create_dir(path, 1);
  52         while ((de = readdir(dir)) != NULL) {
  53                 struct stat st_git, st_template;
  54                 int namelen;
  55                 int exists = 0;
  56
  57                 if (de->d_name[0] == '.')
  58                         continue;
  59                 namelen = strlen(de->d_name);
  60                 if ((PATH_MAX <= baselen + namelen) ||
  61                     (PATH_MAX <= template_baselen + namelen))
  62                         die(_("insanely long template name %s"), de->d_name);
  63                 memcpy(path + baselen, de->d_name, namelen+1);
  64                 memcpy(template + template_baselen, de->d_name, namelen+1);
  65                 if (lstat(path, &st_git)) {
  66                         if (errno != ENOENT)
  67                                 die_errno(_("cannot stat '%s'"), path);
  68                 }
  69                 else
  70                         exists = 1;
  71
  72                 if (lstat(template, &st_template))
  73                         die_errno(_("cannot stat template '%s'"), template);
  74
  75                 if (S_ISDIR(st_template.st_mode)) {
  76                         DIR *subdir = opendir(template);
  77                         int baselen_sub = baselen + namelen;
  78                         int template_baselen_sub = template_baselen + namelen;
  79                         if (!subdir)
  80                                 die_errno(_("cannot opendir '%s'"), template);
  81                         path[baselen_sub++] =
  82                                 template[template_baselen_sub++] = '/';
  83                         path[baselen_sub] =
  84                                 template[template_baselen_sub] = 0;
  85                         copy_templates_1(path, baselen_sub,
  86                                          template, template_baselen_sub,
  87                                          subdir);
  88                         closedir(subdir);
  89                 }
  90                 else if (exists)
  91                         continue;
  92                 else if (S_ISLNK(st_template.st_mode)) {
  93                         char lnk[256];
  94                         int len;
  95                         len = readlink(template, lnk, sizeof(lnk));
  96                         if (len < 0)
  97                                 die_errno(_("cannot readlink '%s'"), template);
  98                         if (sizeof(lnk) <= len)
  99                                 die(_("insanely long symlink %s"), template);
 100                         lnk[len] = 0;
 101                         if (symlink(lnk, path))
 102                                 die_errno(_("cannot symlink '%s' '%s'"), lnk, path);
 103                 }
 104                 else if (S_ISREG(st_template.st_mode)) {
 105                         if (copy_file(path, template, st_template.st_mode))
 106                                 die_errno(_("cannot copy '%s' to '%s'"), template,
 107                                           path);
 108                 }
 109                 else
 110                         error(_("ignoring template %s"), template);
 111         }
 112 }
 113
 114 static void copy_templates(const char *template_dir)
 115 {
 116         char path[PATH_MAX];
 117         char template_path[PATH_MAX];
 118         int template_len;
 119         DIR *dir;
 120         const char *git_dir = get_git_dir();
 121         int len = strlen(git_dir);
 122
 123         if (!template_dir)
 124                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 125         if (!template_dir)
 126                 template_dir = init_db_template_dir;
 127         if (!template_dir)
 128                 template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
 129         if (!template_dir[0])
 130                 return;
 131         template_len = strlen(template_dir);
 132         if (PATH_MAX <= (template_len+strlen("/config")))
 133                 die(_("insanely long template path %s"), template_dir);
 134         strcpy(template_path, template_dir);
 135         if (template_path[template_len-1] != '/') {
 136                 template_path[template_len++] = '/';
 137                 template_path[template_len] = 0;
 138         }
 139         dir = opendir(template_path);
 140         if (!dir) {
 141                 warning(_("templates not found %s"), template_dir);
 142                 return;
 143         }
 144
 145         /* Make sure that template is from the correct vintage */
 146         strcpy(template_path + template_len, "config");
 147         repository_format_version = 0;
 148         git_config_from_file(check_repository_format_version,
 149                              template_path, NULL);
 150         template_path[template_len] = 0;
 151
 152         if (repository_format_version &&
 153             repository_format_version != GIT_REPO_VERSION) {
 154                 warning(_("not copying templates of "
 155                         "a wrong format version %d from '%s'"),
 156                         repository_format_version,
 157                         template_dir);
 158                 closedir(dir);
 159                 return;
 160         }
 161
 162         memcpy(path, git_dir, len);
 163         if (len && path[len - 1] != '/')
 164                 path[len++] = '/';
 165         path[len] = 0;
 166         copy_templates_1(path, len,
 167                          template_path, template_len,
 168                          dir);
 169         closedir(dir);
 170 }
 171
 172 static int git_init_db_config(const char *k, const char *v, void *cb)
 173 {
 174         if (!strcmp(k, "init.templatedir"))
 175                 return git_config_pathname(&init_db_template_dir, k, v);
 176
 177         return 0;
 178 }
 179
 180 static int create_default_files(const char *template_path)
 181 {
 182         const char *git_dir = get_git_dir();
 183         unsigned len = strlen(git_dir);
 184         static char path[PATH_MAX];
 185         struct stat st1;
 186         char repo_version_string[10];
 187         char junk[2];
 188         int reinit;
 189         int filemode;
 190
 191         if (len > sizeof(path)-50)
 192                 die(_("insane git directory %s"), git_dir);
 193         memcpy(path, git_dir, len);
 194
 195         if (len && path[len-1] != '/')
 196                 path[len++] = '/';
 197
 198         /*
 199          * Create .git/refs/{heads,tags}
 200          */
 201         safe_create_dir(git_path("refs"), 1);
 202         safe_create_dir(git_path("refs/heads"), 1);
 203         safe_create_dir(git_path("refs/tags"), 1);
 204
 205         /* Just look for `init.templatedir` */
 206         git_config(git_init_db_config, NULL);
 207
 208         /* First copy the templates -- we might have the default
 209          * config file there, in which case we would want to read
 210          * from it after installing.
 211          */
 212         copy_templates(template_path);
 213
 214         git_config(git_default_config, NULL);
 215         is_bare_repository_cfg = init_is_bare_repository;
 216
 217         /* reading existing config may have overwrote it */
 218         if (init_shared_repository != -1)
 219                 shared_repository = init_shared_repository;
 220
 221         /*
 222          * We would have created the above under user's umask -- under
 223          * shared-repository settings, we would need to fix them up.
 224          */
 225         if (shared_repository) {
 226                 adjust_shared_perm(get_git_dir());
 227                 adjust_shared_perm(git_path("refs"));
 228                 adjust_shared_perm(git_path("refs/heads"));
 229                 adjust_shared_perm(git_path("refs/tags"));
 230         }
 231
 232         /*
 233          * Create the default symlink from ".git/HEAD" to the "master"
 234          * branch, if it does not exist yet.
 235          */
 236         strcpy(path + len, "HEAD");
 237         reinit = (!access(path, R_OK)
 238                   || readlink(path, junk, sizeof(junk)-1) != -1);
 239         if (!reinit) {
 240                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 241                         exit(1);
 242         }
 243
 244         /* This forces creation of new config file */
 245         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 246         git_config_set("core.repositoryformatversion", repo_version_string);
 247
 248         path[len] = 0;
 249         strcpy(path + len, "config");
 250
 251         /* Check filemode trustability */
 252         filemode = TEST_FILEMODE;
 253         if (TEST_FILEMODE && !lstat(path, &st1)) {
 254                 struct stat st2;
 255                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 256                                 !lstat(path, &st2) &&
 257                                 st1.st_mode != st2.st_mode);
 258         }
 259         git_config_set("core.filemode", filemode ? "true" : "false");
 260
 261         if (is_bare_repository())
 262                 git_config_set("core.bare", "true");
 263         else {
 264                 const char *work_tree = get_git_work_tree();
 265                 git_config_set("core.bare", "false");
 266                 /* allow template config file to override the default */
 267                 if (log_all_ref_updates == -1)
 268                     git_config_set("core.logallrefupdates", "true");
 269                 if (prefixcmp(git_dir, work_tree) ||
 270                     strcmp(git_dir + strlen(work_tree), "/.git")) {
 271                         git_config_set("core.worktree", work_tree);
 272                 }
 273         }
 274
 275         if (!reinit) {
 276                 /* Check if symlink is supported in the work tree */
 277                 path[len] = 0;
 278                 strcpy(path + len, "tXXXXXX");
 279                 if (!close(xmkstemp(path)) &&
 280                     !unlink(path) &&
 281                     !symlink("testing", path) &&
 282                     !lstat(path, &st1) &&
 283                     S_ISLNK(st1.st_mode))
 284                         unlink(path); /* good */
 285                 else
 286                         git_config_set("core.symlinks", "false");
 287
 288                 /* Check if the filesystem is case-insensitive */
 289                 path[len] = 0;
 290                 strcpy(path + len, "CoNfIg");
 291                 if (!access(path, F_OK))
 292                         git_config_set("core.ignorecase", "true");
 293         }
 294
 295         return reinit;
 296 }
 297
 298 static void create_object_directory(void)
 299 {
 300         const char *object_directory = get_object_directory();
 301         int len = strlen(object_directory);
 302         char *path = xmalloc(len + 40);
 303
 304         memcpy(path, object_directory, len);
 305
 306         safe_create_dir(object_directory, 1);
 307         strcpy(path+len, "/pack");
 308         safe_create_dir(path, 1);
 309         strcpy(path+len, "/info");
 310         safe_create_dir(path, 1);
 311
 312         free(path);
 313 }
 314
 315 int set_git_dir_init(const char *git_dir, const char *real_git_dir,
 316                      int exist_ok)
 317 {
 318         if (real_git_dir) {
 319                 struct stat st;
 320
 321                 if (!exist_ok && !stat(git_dir, &st))
 322                         die("%s already exists", git_dir);
 323
 324                 if (!exist_ok && !stat(real_git_dir, &st))
 325                         die("%s already exists", real_git_dir);
 326
 327                 /*
 328                  * make sure symlinks are resolved because we'll be
 329                  * moving the target repo later on in separate_git_dir()
 330                  */
 331                 git_link = xstrdup(real_path(git_dir));
 332         }
 333         else {
 334                 real_git_dir = real_path(git_dir);
 335                 git_link = NULL;
 336         }
 337         set_git_dir(real_path(real_git_dir));
 338         return 0;
 339 }
 340
 341 static void separate_git_dir(const char *git_dir)
 342 {
 343         struct stat st;
 344         FILE *fp;
 345
 346         if (!stat(git_link, &st)) {
 347                 const char *src;
 348
 349                 if (S_ISREG(st.st_mode))
 350                         src = read_gitfile_gently(git_link);
 351                 else if (S_ISDIR(st.st_mode))
 352                         src = git_link;
 353                 else
 354                         die("unable to handle file type %d", st.st_mode);
 355
 356                 if (rename(src, git_dir))
 357                         die_errno("unable to move %s to %s", src, git_dir);
 358         }
 359
 360         fp = fopen(git_link, "w");
 361         if (!fp)
 362                 die("Could not create git link %s", git_link);
 363         fprintf(fp, "gitdir: %s\n", git_dir);
 364         fclose(fp);
 365 }
 366
 367 int init_db(const char *template_dir, unsigned int flags)
 368 {
 369         int reinit;
 370         const char *git_dir = get_git_dir();
 371
 372         if (git_link)
 373                 separate_git_dir(git_dir);
 374
 375         safe_create_dir(git_dir, 0);
 376
 377         init_is_bare_repository = is_bare_repository();
 378
 379         /* Check to see if the repository version is right.
 380          * Note that a newly created repository does not have
 381          * config file, so this will not fail.  What we are catching
 382          * is an attempt to reinitialize new repository with an old tool.
 383          */
 384         check_repository_format();
 385
 386         reinit = create_default_files(template_dir);
 387
 388         create_object_directory();
 389
 390         if (shared_repository) {
 391                 char buf[10];
 392                 /* We do not spell "group" and such, so that
 393                  * the configuration can be read by older version
 394                  * of git. Note, we use octal numbers for new share modes,
 395                  * and compatibility values for PERM_GROUP and
 396                  * PERM_EVERYBODY.
 397                  */
 398                 if (shared_repository < 0)
 399                         /* force to the mode value */
 400                         sprintf(buf, "0%o", -shared_repository);
 401                 else if (shared_repository == PERM_GROUP)
 402                         sprintf(buf, "%d", OLD_PERM_GROUP);
 403                 else if (shared_repository == PERM_EVERYBODY)
 404                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
 405                 else
 406                         die("oops");
 407                 git_config_set("core.sharedrepository", buf);
 408                 git_config_set("receive.denyNonFastforwards", "true");
 409         }
 410
 411         if (!(flags & INIT_DB_QUIET)) {
 412                 int len = strlen(git_dir);
 413
 414                 /*
 415                  * TRANSLATORS: The first '%s' is either "Reinitialized
 416                  * existing" or "Initialized empty", the second " shared" or
 417                  * "", and the last '%s%s' is the verbatim directory name.
 418                  */
 419                 printf(_("%s%s Git repository in %s%s\n"),
 420                        reinit ? _("Reinitialized existing") : _("Initialized empty"),
 421                        shared_repository ? _(" shared") : "",
 422                        git_dir, len && git_dir[len-1] != '/' ? "/" : "");
 423         }
 424
 425         return 0;
 426 }
 427
 428 static int guess_repository_type(const char *git_dir)
 429 {
 430         char cwd[PATH_MAX];
 431         const char *slash;
 432
 433         /*
 434          * "GIT_DIR=. git init" is always bare.
 435          * "GIT_DIR=`pwd` git init" too.
 436          */
 437         if (!strcmp(".", git_dir))
 438                 return 1;
 439         if (!getcwd(cwd, sizeof(cwd)))
 440                 die_errno(_("cannot tell cwd"));
 441         if (!strcmp(git_dir, cwd))
 442                 return 1;
 443         /*
 444          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
 445          */
 446         if (!strcmp(git_dir, ".git"))
 447                 return 0;
 448         slash = strrchr(git_dir, '/');
 449         if (slash && !strcmp(slash, "/.git"))
 450                 return 0;
 451
 452         /*
 453          * Otherwise it is often bare.  At this point
 454          * we are just guessing.
 455          */
 456         return 1;
 457 }
 458
 459 static int shared_callback(const struct option *opt, const char *arg, int unset)
 460 {
 461         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
 462         return 0;
 463 }
 464
 465 static const char *const init_db_usage[] = {
 466         "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]",
 467         NULL
 468 };
 469
 470 /*
 471  * If you want to, you can share the DB area with any number of branches.
 472  * That has advantages: you can save space by sharing all the SHA1 objects.
 473  * On the other hand, it might just make lookup slower and messier. You
 474  * be the judge.  The default case is to have one DB per managed directory.
 475  */
 476 int cmd_init_db(int argc, const char **argv, const char *prefix)
 477 {
 478         const char *git_dir;
 479         const char *real_git_dir = NULL;
 480         const char *work_tree;
 481         const char *template_dir = NULL;
 482         unsigned int flags = 0;
 483         const struct option init_db_options[] = {
 484                 OPT_STRING(0, "template", &template_dir, "template-directory",
 485                                 "directory from which templates will be used"),
 486                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
 487                                 "create a bare repository", 1),
 488                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
 489                         "permissions",
 490                         "specify that the git repository is to be shared amongst several users",
 491                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
 492                 OPT_BIT('q', "quiet", &flags, "be quiet", INIT_DB_QUIET),
 493                 OPT_STRING('L', "separate-git-dir", &real_git_dir, "gitdir",
 494                            "separate git dir from working tree"),
 495                 OPT_END()
 496         };
 497
 498         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 499
 500         if (real_git_dir && !is_absolute_path(real_git_dir))
 501                 real_git_dir = xstrdup(real_path(real_git_dir));
 502
 503         if (argc == 1) {
 504                 int mkdir_tried = 0;
 505         retry:
 506                 if (chdir(argv[0]) < 0) {
 507                         if (!mkdir_tried) {
 508                                 int saved;
 509                                 /*
 510                                  * At this point we haven't read any configuration,
 511                                  * and we know shared_repository should always be 0;
 512                                  * but just in case we play safe.
 513                                  */
 514                                 saved = shared_repository;
 515                                 shared_repository = 0;
 516                                 switch (safe_create_leading_directories_const(argv[0])) {
 517                                 case -3:
 518                                         errno = EEXIST;
 519                                         /* fallthru */
 520                                 case -1:
 521                                         die_errno(_("cannot mkdir %s"), argv[0]);
 522                                         break;
 523                                 default:
 524                                         break;
 525                                 }
 526                                 shared_repository = saved;
 527                                 if (mkdir(argv[0], 0777) < 0)
 528                                         die_errno(_("cannot mkdir %s"), argv[0]);
 529                                 mkdir_tried = 1;
 530                                 goto retry;
 531                         }
 532                         die_errno(_("cannot chdir to %s"), argv[0]);
 533                 }
 534         } else if (0 < argc) {
 535                 usage(init_db_usage[0]);
 536         }
 537         if (is_bare_repository_cfg == 1) {
 538                 static char git_dir[PATH_MAX+1];
 539
 540                 setenv(GIT_DIR_ENVIRONMENT,
 541                         getcwd(git_dir, sizeof(git_dir)), argc > 0);
 542         }
 543
 544         if (init_shared_repository != -1)
 545                 shared_repository = init_shared_repository;
 546
 547         /*
 548          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 549          * without --bare.  Catch the error early.
 550          */
 551         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 552         work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 553         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 554                 die(_("%s (or --work-tree=<directory>) not allowed without "
 555                           "specifying %s (or --git-dir=<directory>)"),
 556                     GIT_WORK_TREE_ENVIRONMENT,
 557                     GIT_DIR_ENVIRONMENT);
 558
 559         /*
 560          * Set up the default .git directory contents
 561          */
 562         if (!git_dir)
 563                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 564
 565         if (is_bare_repository_cfg < 0)
 566                 is_bare_repository_cfg = guess_repository_type(git_dir);
 567
 568         if (!is_bare_repository_cfg) {
 569                 const char *git_dir_parent = strrchr(git_dir, '/');
 570                 if (git_dir_parent) {
 571                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 572                         git_work_tree_cfg = xstrdup(real_path(rel));
 573                         free(rel);
 574                 }
 575                 if (!git_work_tree_cfg) {
 576                         git_work_tree_cfg = xcalloc(PATH_MAX, 1);
 577                         if (!getcwd(git_work_tree_cfg, PATH_MAX))
 578                                 die_errno (_("Cannot access current working directory"));
 579                 }
 580                 if (work_tree)
 581                         set_git_work_tree(real_path(work_tree));
 582                 else
 583                         set_git_work_tree(git_work_tree_cfg);
 584                 if (access(get_git_work_tree(), X_OK))
 585                         die_errno (_("Cannot access work tree '%s'"),
 586                                    get_git_work_tree());
 587         }
 588         else {
 589                 if (work_tree)
 590                         set_git_work_tree(real_path(work_tree));
 591         }
 592
 593         set_git_dir_init(git_dir, real_git_dir, 1);
 594
 595         return init_db(template_dir, flags);
 596 }