The sixth batch
[git.git] / builtin / init-db.c
blob2167796ff2aad00762c2011b399305c94daa2a40
1 /*
2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
5 */
6 #include "cache.h"
7 #include "config.h"
8 #include "refs.h"
9 #include "builtin.h"
10 #include "exec-cmd.h"
11 #include "parse-options.h"
12 #include "worktree.h"
14 #ifndef DEFAULT_GIT_TEMPLATE_DIR
15 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
16 #endif
18 #ifdef NO_TRUSTABLE_FILEMODE
19 #define TEST_FILEMODE 0
20 #else
21 #define TEST_FILEMODE 1
22 #endif
24 #define GIT_DEFAULT_HASH_ENVIRONMENT "GIT_DEFAULT_HASH"
26 static int init_is_bare_repository = 0;
27 static int init_shared_repository = -1;
29 static void copy_templates_1(struct strbuf *path, struct strbuf *template_path,
30 DIR *dir)
32 size_t path_baselen = path->len;
33 size_t template_baselen = template_path->len;
34 struct dirent *de;
36 /* Note: if ".git/hooks" file exists in the repository being
37 * re-initialized, /etc/core-git/templates/hooks/update would
38 * cause "git init" to fail here. I think this is sane but
39 * it means that the set of templates we ship by default, along
40 * with the way the namespace under .git/ is organized, should
41 * be really carefully chosen.
43 safe_create_dir(path->buf, 1);
44 while ((de = readdir(dir)) != NULL) {
45 struct stat st_git, st_template;
46 int exists = 0;
48 strbuf_setlen(path, path_baselen);
49 strbuf_setlen(template_path, template_baselen);
51 if (de->d_name[0] == '.')
52 continue;
53 strbuf_addstr(path, de->d_name);
54 strbuf_addstr(template_path, de->d_name);
55 if (lstat(path->buf, &st_git)) {
56 if (errno != ENOENT)
57 die_errno(_("cannot stat '%s'"), path->buf);
59 else
60 exists = 1;
62 if (lstat(template_path->buf, &st_template))
63 die_errno(_("cannot stat template '%s'"), template_path->buf);
65 if (S_ISDIR(st_template.st_mode)) {
66 DIR *subdir = opendir(template_path->buf);
67 if (!subdir)
68 die_errno(_("cannot opendir '%s'"), template_path->buf);
69 strbuf_addch(path, '/');
70 strbuf_addch(template_path, '/');
71 copy_templates_1(path, template_path, subdir);
72 closedir(subdir);
74 else if (exists)
75 continue;
76 else if (S_ISLNK(st_template.st_mode)) {
77 struct strbuf lnk = STRBUF_INIT;
78 if (strbuf_readlink(&lnk, template_path->buf,
79 st_template.st_size) < 0)
80 die_errno(_("cannot readlink '%s'"), template_path->buf);
81 if (symlink(lnk.buf, path->buf))
82 die_errno(_("cannot symlink '%s' '%s'"),
83 lnk.buf, path->buf);
84 strbuf_release(&lnk);
86 else if (S_ISREG(st_template.st_mode)) {
87 if (copy_file(path->buf, template_path->buf, st_template.st_mode))
88 die_errno(_("cannot copy '%s' to '%s'"),
89 template_path->buf, path->buf);
91 else
92 error(_("ignoring template %s"), template_path->buf);
96 static void copy_templates(const char *template_dir, const char *init_template_dir)
98 struct strbuf path = STRBUF_INIT;
99 struct strbuf template_path = STRBUF_INIT;
100 size_t template_len;
101 struct repository_format template_format = REPOSITORY_FORMAT_INIT;
102 struct strbuf err = STRBUF_INIT;
103 DIR *dir;
104 char *to_free = NULL;
106 if (!template_dir)
107 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
108 if (!template_dir)
109 template_dir = init_template_dir;
110 if (!template_dir)
111 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
112 if (!template_dir[0]) {
113 free(to_free);
114 return;
117 strbuf_addstr(&template_path, template_dir);
118 strbuf_complete(&template_path, '/');
119 template_len = template_path.len;
121 dir = opendir(template_path.buf);
122 if (!dir) {
123 warning(_("templates not found in %s"), template_dir);
124 goto free_return;
127 /* Make sure that template is from the correct vintage */
128 strbuf_addstr(&template_path, "config");
129 read_repository_format(&template_format, template_path.buf);
130 strbuf_setlen(&template_path, template_len);
133 * No mention of version at all is OK, but anything else should be
134 * verified.
136 if (template_format.version >= 0 &&
137 verify_repository_format(&template_format, &err) < 0) {
138 warning(_("not copying templates from '%s': %s"),
139 template_dir, err.buf);
140 strbuf_release(&err);
141 goto close_free_return;
144 strbuf_addstr(&path, get_git_common_dir());
145 strbuf_complete(&path, '/');
146 copy_templates_1(&path, &template_path, dir);
147 close_free_return:
148 closedir(dir);
149 free_return:
150 free(to_free);
151 strbuf_release(&path);
152 strbuf_release(&template_path);
153 clear_repository_format(&template_format);
157 * If the git_dir is not directly inside the working tree, then git will not
158 * find it by default, and we need to set the worktree explicitly.
160 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
162 if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
163 return 0;
164 if (skip_prefix(git_dir, work_tree, &git_dir) &&
165 !strcmp(git_dir, "/.git"))
166 return 0;
167 return 1;
170 void initialize_repository_version(int hash_algo, int reinit)
172 char repo_version_string[10];
173 int repo_version = GIT_REPO_VERSION;
175 if (hash_algo != GIT_HASH_SHA1)
176 repo_version = GIT_REPO_VERSION_READ;
178 /* This forces creation of new config file */
179 xsnprintf(repo_version_string, sizeof(repo_version_string),
180 "%d", repo_version);
181 git_config_set("core.repositoryformatversion", repo_version_string);
183 if (hash_algo != GIT_HASH_SHA1)
184 git_config_set("extensions.objectformat",
185 hash_algos[hash_algo].name);
186 else if (reinit)
187 git_config_set_gently("extensions.objectformat", NULL);
190 static int create_default_files(const char *template_path,
191 const char *original_git_dir,
192 const char *initial_branch,
193 const struct repository_format *fmt,
194 int quiet)
196 struct stat st1;
197 struct strbuf buf = STRBUF_INIT;
198 char *path;
199 char junk[2];
200 int reinit;
201 int filemode;
202 struct strbuf err = STRBUF_INIT;
203 const char *init_template_dir = NULL;
204 const char *work_tree = get_git_work_tree();
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.
211 * Before reading that config, we also need to clear out any cached
212 * values (since we've just potentially changed what's available on
213 * disk).
215 git_config_get_pathname("init.templatedir", &init_template_dir);
216 copy_templates(template_path, init_template_dir);
217 free((char *)init_template_dir);
218 git_config_clear();
219 reset_shared_repository();
220 git_config(git_default_config, NULL);
223 * We must make sure command-line options continue to override any
224 * values we might have just re-read from the config.
226 is_bare_repository_cfg = init_is_bare_repository || !work_tree;
227 if (init_shared_repository != -1)
228 set_shared_repository(init_shared_repository);
231 * We would have created the above under user's umask -- under
232 * shared-repository settings, we would need to fix them up.
234 if (get_shared_repository()) {
235 adjust_shared_perm(get_git_dir());
239 * We need to create a "refs" dir in any case so that older
240 * versions of git can tell that this is a repository.
242 safe_create_dir(git_path("refs"), 1);
243 adjust_shared_perm(git_path("refs"));
245 if (refs_init_db(&err))
246 die("failed to set up refs db: %s", err.buf);
249 * Point the HEAD symref to the initial branch with if HEAD does
250 * not yet exist.
252 path = git_path_buf(&buf, "HEAD");
253 reinit = (!access(path, R_OK)
254 || readlink(path, junk, sizeof(junk)-1) != -1);
255 if (!reinit) {
256 char *ref;
258 if (!initial_branch)
259 initial_branch = git_default_branch_name(quiet);
261 ref = xstrfmt("refs/heads/%s", initial_branch);
262 if (check_refname_format(ref, 0) < 0)
263 die(_("invalid initial branch name: '%s'"),
264 initial_branch);
266 if (create_symref("HEAD", ref, NULL) < 0)
267 exit(1);
268 free(ref);
271 initialize_repository_version(fmt->hash_algo, 0);
273 /* Check filemode trustability */
274 path = git_path_buf(&buf, "config");
275 filemode = TEST_FILEMODE;
276 if (TEST_FILEMODE && !lstat(path, &st1)) {
277 struct stat st2;
278 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
279 !lstat(path, &st2) &&
280 st1.st_mode != st2.st_mode &&
281 !chmod(path, st1.st_mode));
282 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
283 filemode = 0;
285 git_config_set("core.filemode", filemode ? "true" : "false");
287 if (is_bare_repository())
288 git_config_set("core.bare", "true");
289 else {
290 git_config_set("core.bare", "false");
291 /* allow template config file to override the default */
292 if (log_all_ref_updates == LOG_REFS_UNSET)
293 git_config_set("core.logallrefupdates", "true");
294 if (needs_work_tree_config(original_git_dir, work_tree))
295 git_config_set("core.worktree", work_tree);
298 if (!reinit) {
299 /* Check if symlink is supported in the work tree */
300 path = git_path_buf(&buf, "tXXXXXX");
301 if (!close(xmkstemp(path)) &&
302 !unlink(path) &&
303 !symlink("testing", path) &&
304 !lstat(path, &st1) &&
305 S_ISLNK(st1.st_mode))
306 unlink(path); /* good */
307 else
308 git_config_set("core.symlinks", "false");
310 /* Check if the filesystem is case-insensitive */
311 path = git_path_buf(&buf, "CoNfIg");
312 if (!access(path, F_OK))
313 git_config_set("core.ignorecase", "true");
314 probe_utf8_pathname_composition();
317 strbuf_release(&buf);
318 return reinit;
321 static void create_object_directory(void)
323 struct strbuf path = STRBUF_INIT;
324 size_t baselen;
326 strbuf_addstr(&path, get_object_directory());
327 baselen = path.len;
329 safe_create_dir(path.buf, 1);
331 strbuf_setlen(&path, baselen);
332 strbuf_addstr(&path, "/pack");
333 safe_create_dir(path.buf, 1);
335 strbuf_setlen(&path, baselen);
336 strbuf_addstr(&path, "/info");
337 safe_create_dir(path.buf, 1);
339 strbuf_release(&path);
342 static void separate_git_dir(const char *git_dir, const char *git_link)
344 struct stat st;
346 if (!stat(git_link, &st)) {
347 const char *src;
349 if (S_ISREG(st.st_mode))
350 src = read_gitfile(git_link);
351 else if (S_ISDIR(st.st_mode))
352 src = git_link;
353 else
354 die(_("unable to handle file type %d"), (int)st.st_mode);
356 if (rename(src, git_dir))
357 die_errno(_("unable to move %s to %s"), src, git_dir);
358 repair_worktrees(NULL, NULL);
361 write_file(git_link, "gitdir: %s", git_dir);
364 static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash)
366 const char *env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT);
368 * If we already have an initialized repo, don't allow the user to
369 * specify a different algorithm, as that could cause corruption.
370 * Otherwise, if the user has specified one on the command line, use it.
372 if (repo_fmt->version >= 0 && hash != GIT_HASH_UNKNOWN && hash != repo_fmt->hash_algo)
373 die(_("attempt to reinitialize repository with different hash"));
374 else if (hash != GIT_HASH_UNKNOWN)
375 repo_fmt->hash_algo = hash;
376 else if (env) {
377 int env_algo = hash_algo_by_name(env);
378 if (env_algo == GIT_HASH_UNKNOWN)
379 die(_("unknown hash algorithm '%s'"), env);
380 repo_fmt->hash_algo = env_algo;
384 int init_db(const char *git_dir, const char *real_git_dir,
385 const char *template_dir, int hash, const char *initial_branch,
386 unsigned int flags)
388 int reinit;
389 int exist_ok = flags & INIT_DB_EXIST_OK;
390 char *original_git_dir = real_pathdup(git_dir, 1);
391 struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
393 if (real_git_dir) {
394 struct stat st;
396 if (!exist_ok && !stat(git_dir, &st))
397 die(_("%s already exists"), git_dir);
399 if (!exist_ok && !stat(real_git_dir, &st))
400 die(_("%s already exists"), real_git_dir);
402 set_git_dir(real_git_dir, 1);
403 git_dir = get_git_dir();
404 separate_git_dir(git_dir, original_git_dir);
406 else {
407 set_git_dir(git_dir, 1);
408 git_dir = get_git_dir();
410 startup_info->have_repository = 1;
412 /* Ensure `core.hidedotfiles` is processed */
413 git_config(platform_core_config, NULL);
415 safe_create_dir(git_dir, 0);
417 init_is_bare_repository = is_bare_repository();
419 /* Check to see if the repository version is right.
420 * Note that a newly created repository does not have
421 * config file, so this will not fail. What we are catching
422 * is an attempt to reinitialize new repository with an old tool.
424 check_repository_format(&repo_fmt);
426 validate_hash_algorithm(&repo_fmt, hash);
428 reinit = create_default_files(template_dir, original_git_dir,
429 initial_branch, &repo_fmt,
430 flags & INIT_DB_QUIET);
431 if (reinit && initial_branch)
432 warning(_("re-init: ignored --initial-branch=%s"),
433 initial_branch);
435 create_object_directory();
437 if (get_shared_repository()) {
438 char buf[10];
439 /* We do not spell "group" and such, so that
440 * the configuration can be read by older version
441 * of git. Note, we use octal numbers for new share modes,
442 * and compatibility values for PERM_GROUP and
443 * PERM_EVERYBODY.
445 if (get_shared_repository() < 0)
446 /* force to the mode value */
447 xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
448 else if (get_shared_repository() == PERM_GROUP)
449 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
450 else if (get_shared_repository() == PERM_EVERYBODY)
451 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
452 else
453 BUG("invalid value for shared_repository");
454 git_config_set("core.sharedrepository", buf);
455 git_config_set("receive.denyNonFastforwards", "true");
458 if (!(flags & INIT_DB_QUIET)) {
459 int len = strlen(git_dir);
461 if (reinit)
462 printf(get_shared_repository()
463 ? _("Reinitialized existing shared Git repository in %s%s\n")
464 : _("Reinitialized existing Git repository in %s%s\n"),
465 git_dir, len && git_dir[len-1] != '/' ? "/" : "");
466 else
467 printf(get_shared_repository()
468 ? _("Initialized empty shared Git repository in %s%s\n")
469 : _("Initialized empty Git repository in %s%s\n"),
470 git_dir, len && git_dir[len-1] != '/' ? "/" : "");
473 free(original_git_dir);
474 return 0;
477 static int guess_repository_type(const char *git_dir)
479 const char *slash;
480 char *cwd;
481 int cwd_is_git_dir;
484 * "GIT_DIR=. git init" is always bare.
485 * "GIT_DIR=`pwd` git init" too.
487 if (!strcmp(".", git_dir))
488 return 1;
489 cwd = xgetcwd();
490 cwd_is_git_dir = !strcmp(git_dir, cwd);
491 free(cwd);
492 if (cwd_is_git_dir)
493 return 1;
495 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
497 if (!strcmp(git_dir, ".git"))
498 return 0;
499 slash = strrchr(git_dir, '/');
500 if (slash && !strcmp(slash, "/.git"))
501 return 0;
504 * Otherwise it is often bare. At this point
505 * we are just guessing.
507 return 1;
510 static int shared_callback(const struct option *opt, const char *arg, int unset)
512 BUG_ON_OPT_NEG(unset);
513 *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
514 return 0;
517 static const char *const init_db_usage[] = {
518 N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
519 NULL
523 * If you want to, you can share the DB area with any number of branches.
524 * That has advantages: you can save space by sharing all the SHA1 objects.
525 * On the other hand, it might just make lookup slower and messier. You
526 * be the judge. The default case is to have one DB per managed directory.
528 int cmd_init_db(int argc, const char **argv, const char *prefix)
530 const char *git_dir;
531 const char *real_git_dir = NULL;
532 const char *work_tree;
533 const char *template_dir = NULL;
534 unsigned int flags = 0;
535 const char *object_format = NULL;
536 const char *initial_branch = NULL;
537 int hash_algo = GIT_HASH_UNKNOWN;
538 const struct option init_db_options[] = {
539 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
540 N_("directory from which templates will be used")),
541 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
542 N_("create a bare repository"), 1),
543 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
544 N_("permissions"),
545 N_("specify that the git repository is to be shared amongst several users"),
546 PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
547 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
548 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
549 N_("separate git dir from working tree")),
550 OPT_STRING('b', "initial-branch", &initial_branch, N_("name"),
551 N_("override the name of the initial branch")),
552 OPT_STRING(0, "object-format", &object_format, N_("hash"),
553 N_("specify the hash algorithm to use")),
554 OPT_END()
557 argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
559 if (real_git_dir && is_bare_repository_cfg == 1)
560 die(_("--separate-git-dir and --bare are mutually exclusive"));
562 if (real_git_dir && !is_absolute_path(real_git_dir))
563 real_git_dir = real_pathdup(real_git_dir, 1);
565 if (template_dir && *template_dir && !is_absolute_path(template_dir)) {
566 template_dir = absolute_pathdup(template_dir);
567 UNLEAK(template_dir);
570 if (argc == 1) {
571 int mkdir_tried = 0;
572 retry:
573 if (chdir(argv[0]) < 0) {
574 if (!mkdir_tried) {
575 int saved;
577 * At this point we haven't read any configuration,
578 * and we know shared_repository should always be 0;
579 * but just in case we play safe.
581 saved = get_shared_repository();
582 set_shared_repository(0);
583 switch (safe_create_leading_directories_const(argv[0])) {
584 case SCLD_OK:
585 case SCLD_PERMS:
586 break;
587 case SCLD_EXISTS:
588 errno = EEXIST;
589 /* fallthru */
590 default:
591 die_errno(_("cannot mkdir %s"), argv[0]);
592 break;
594 set_shared_repository(saved);
595 if (mkdir(argv[0], 0777) < 0)
596 die_errno(_("cannot mkdir %s"), argv[0]);
597 mkdir_tried = 1;
598 goto retry;
600 die_errno(_("cannot chdir to %s"), argv[0]);
602 } else if (0 < argc) {
603 usage(init_db_usage[0]);
605 if (is_bare_repository_cfg == 1) {
606 char *cwd = xgetcwd();
607 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
608 free(cwd);
611 if (object_format) {
612 hash_algo = hash_algo_by_name(object_format);
613 if (hash_algo == GIT_HASH_UNKNOWN)
614 die(_("unknown hash algorithm '%s'"), object_format);
617 if (init_shared_repository != -1)
618 set_shared_repository(init_shared_repository);
621 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
622 * without --bare. Catch the error early.
624 git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
625 work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
626 if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
627 die(_("%s (or --work-tree=<directory>) not allowed without "
628 "specifying %s (or --git-dir=<directory>)"),
629 GIT_WORK_TREE_ENVIRONMENT,
630 GIT_DIR_ENVIRONMENT);
633 * Set up the default .git directory contents
635 if (!git_dir)
636 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
639 * When --separate-git-dir is used inside a linked worktree, take
640 * care to ensure that the common .git/ directory is relocated, not
641 * the worktree-specific .git/worktrees/<id>/ directory.
643 if (real_git_dir) {
644 int err;
645 const char *p;
646 struct strbuf sb = STRBUF_INIT;
648 p = read_gitfile_gently(git_dir, &err);
649 if (p && get_common_dir(&sb, p)) {
650 struct strbuf mainwt = STRBUF_INIT;
652 strbuf_addbuf(&mainwt, &sb);
653 strbuf_strip_suffix(&mainwt, "/.git");
654 if (chdir(mainwt.buf) < 0)
655 die_errno(_("cannot chdir to %s"), mainwt.buf);
656 strbuf_release(&mainwt);
657 git_dir = strbuf_detach(&sb, NULL);
659 strbuf_release(&sb);
662 if (is_bare_repository_cfg < 0)
663 is_bare_repository_cfg = guess_repository_type(git_dir);
665 if (!is_bare_repository_cfg) {
666 const char *git_dir_parent = strrchr(git_dir, '/');
667 if (git_dir_parent) {
668 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
669 git_work_tree_cfg = real_pathdup(rel, 1);
670 free(rel);
672 if (!git_work_tree_cfg)
673 git_work_tree_cfg = xgetcwd();
674 if (work_tree)
675 set_git_work_tree(work_tree);
676 else
677 set_git_work_tree(git_work_tree_cfg);
678 if (access(get_git_work_tree(), X_OK))
679 die_errno (_("Cannot access work tree '%s'"),
680 get_git_work_tree());
682 else {
683 if (real_git_dir)
684 die(_("--separate-git-dir incompatible with bare repository"));
685 if (work_tree)
686 set_git_work_tree(work_tree);
689 UNLEAK(real_git_dir);
690 UNLEAK(git_dir);
691 UNLEAK(work_tree);
693 flags |= INIT_DB_EXIST_OK;
694 return init_db(git_dir, real_git_dir, template_dir, hash_algo,
695 initial_branch, flags);