1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6#include "cache.h"
7#include "refs.h"
8#include "builtin.h"
9#include "exec_cmd.h"
10#include "parse-options.h"
11#ifndef DEFAULT_GIT_TEMPLATE_DIR
13#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
14#endif
15#ifdef NO_TRUSTABLE_FILEMODE
17#define TEST_FILEMODE 0
18#else
19#define TEST_FILEMODE 1
20#endif
21static int init_is_bare_repository = 0;
23static int init_shared_repository = -1;
24static const char *init_db_template_dir;
25static const char *git_link;
26static void copy_templates_1(struct strbuf *path, struct strbuf *template,
28 DIR *dir)
29{
30 size_t path_baselen = path->len;
31 size_t template_baselen = template->len;
32 struct dirent *de;
33 /* Note: if ".git/hooks" file exists in the repository being
35 * re-initialized, /etc/core-git/templates/hooks/update would
36 * cause "git init" to fail here. I think this is sane but
37 * it means that the set of templates we ship by default, along
38 * with the way the namespace under .git/ is organized, should
39 * be really carefully chosen.
40 */
41 safe_create_dir(path->buf, 1);
42 while ((de = readdir(dir)) != NULL) {
43 struct stat st_git, st_template;
44 int exists = 0;
45 strbuf_setlen(path, path_baselen);
47 strbuf_setlen(template, template_baselen);
48 if (de->d_name[0] == '.')
50 continue;
51 strbuf_addstr(path, de->d_name);
52 strbuf_addstr(template, de->d_name);
53 if (lstat(path->buf, &st_git)) {
54 if (errno != ENOENT)
55 die_errno(_("cannot stat '%s'"), path->buf);
56 }
57 else
58 exists = 1;
59 if (lstat(template->buf, &st_template))
61 die_errno(_("cannot stat template '%s'"), template->buf);
62 if (S_ISDIR(st_template.st_mode)) {
64 DIR *subdir = opendir(template->buf);
65 if (!subdir)
66 die_errno(_("cannot opendir '%s'"), template->buf);
67 strbuf_addch(path, '/');
68 strbuf_addch(template, '/');
69 copy_templates_1(path, template, subdir);
70 closedir(subdir);
71 }
72 else if (exists)
73 continue;
74 else if (S_ISLNK(st_template.st_mode)) {
75 struct strbuf lnk = STRBUF_INIT;
76 if (strbuf_readlink(&lnk, template->buf, 0) < 0)
77 die_errno(_("cannot readlink '%s'"), template->buf);
78 if (symlink(lnk.buf, path->buf))
79 die_errno(_("cannot symlink '%s' '%s'"),
80 lnk.buf, path->buf);
81 strbuf_release(&lnk);
82 }
83 else if (S_ISREG(st_template.st_mode)) {
84 if (copy_file(path->buf, template->buf, st_template.st_mode))
85 die_errno(_("cannot copy '%s' to '%s'"),
86 template->buf, path->buf);
87 }
88 else
89 error(_("ignoring template %s"), template->buf);
90 }
91}
92static void copy_templates(const char *template_dir)
94{
95 struct strbuf path = STRBUF_INIT;
96 struct strbuf template_path = STRBUF_INIT;
97 size_t template_len;
98 struct repository_format template_format;
99 struct strbuf err = STRBUF_INIT;
100 DIR *dir;
101 char *to_free = NULL;
102 if (!template_dir)
104 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
105 if (!template_dir)
106 template_dir = init_db_template_dir;
107 if (!template_dir)
108 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
109 if (!template_dir[0]) {
110 free(to_free);
111 return;
112 }
113 strbuf_addstr(&template_path, template_dir);
115 strbuf_complete(&template_path, '/');
116 template_len = template_path.len;
117 dir = opendir(template_path.buf);
119 if (!dir) {
120 warning(_("templates not found %s"), template_dir);
121 goto free_return;
122 }
123 /* Make sure that template is from the correct vintage */
125 strbuf_addstr(&template_path, "config");
126 read_repository_format(&template_format, template_path.buf);
127 strbuf_setlen(&template_path, template_len);
128 /*
130 * No mention of version at all is OK, but anything else should be
131 * verified.
132 */
133 if (template_format.version >= 0 &&
134 verify_repository_format(&template_format, &err) < 0) {
135 warning(_("not copying templates from '%s': %s"),
136 template_dir, err.buf);
137 strbuf_release(&err);
138 goto close_free_return;
139 }
140 strbuf_addstr(&path, get_git_dir());
142 strbuf_complete(&path, '/');
143 copy_templates_1(&path, &template_path, dir);
144close_free_return:
145 closedir(dir);
146free_return:
147 free(to_free);
148 strbuf_release(&path);
149 strbuf_release(&template_path);
150}
151static int git_init_db_config(const char *k, const char *v, void *cb)
153{
154 if (!strcmp(k, "init.templatedir"))
155 return git_config_pathname(&init_db_template_dir, k, v);
156 return 0;
158}
159/*
161 * If the git_dir is not directly inside the working tree, then git will not
162 * find it by default, and we need to set the worktree explicitly.
163 */
164static int needs_work_tree_config(const char *git_dir, const char *work_tree)
165{
166 if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
167 return 0;
168 if (skip_prefix(git_dir, work_tree, &git_dir) &&
169 !strcmp(git_dir, "/.git"))
170 return 0;
171 return 1;
172}
173static int create_default_files(const char *template_path)
175{
176 struct stat st1;
177 struct strbuf buf = STRBUF_INIT;
178 char *path;
179 char repo_version_string[10];
180 char junk[2];
181 int reinit;
182 int filemode;
183 /*
185 * Create .git/refs/{heads,tags}
186 */
187 safe_create_dir(git_path_buf(&buf, "refs"), 1);
188 safe_create_dir(git_path_buf(&buf, "refs/heads"), 1);
189 safe_create_dir(git_path_buf(&buf, "refs/tags"), 1);
190 /* Just look for `init.templatedir` */
192 git_config(git_init_db_config, NULL);
193 /*
195 * First copy the templates -- we might have the default
196 * config file there, in which case we would want to read
197 * from it after installing.
198 *
199 * Before reading that config, we also need to clear out any cached
200 * values (since we've just potentially changed what's available on
201 * disk).
202 */
203 copy_templates(template_path);
204 git_config_clear();
205 reset_shared_repository();
206 git_config(git_default_config, NULL);
207 /*
209 * We must make sure command-line options continue to override any
210 * values we might have just re-read from the config.
211 */
212 is_bare_repository_cfg = init_is_bare_repository;
213 if (init_shared_repository != -1)
214 set_shared_repository(init_shared_repository);
215 /*
217 * We would have created the above under user's umask -- under
218 * shared-repository settings, we would need to fix them up.
219 */
220 if (get_shared_repository()) {
221 adjust_shared_perm(get_git_dir());
222 adjust_shared_perm(git_path_buf(&buf, "refs"));
223 adjust_shared_perm(git_path_buf(&buf, "refs/heads"));
224 adjust_shared_perm(git_path_buf(&buf, "refs/tags"));
225 }
226 /*
228 * Create the default symlink from ".git/HEAD" to the "master"
229 * branch, if it does not exist yet.
230 */
231 path = git_path_buf(&buf, "HEAD");
232 reinit = (!access(path, R_OK)
233 || readlink(path, junk, sizeof(junk)-1) != -1);
234 if (!reinit) {
235 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
236 exit(1);
237 }
238 /* This forces creation of new config file */
240 xsnprintf(repo_version_string, sizeof(repo_version_string),
241 "%d", GIT_REPO_VERSION);
242 git_config_set("core.repositoryformatversion", repo_version_string);
243 /* Check filemode trustability */
245 path = git_path_buf(&buf, "config");
246 filemode = TEST_FILEMODE;
247 if (TEST_FILEMODE && !lstat(path, &st1)) {
248 struct stat st2;
249 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
250 !lstat(path, &st2) &&
251 st1.st_mode != st2.st_mode &&
252 !chmod(path, st1.st_mode));
253 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
254 filemode = 0;
255 }
256 git_config_set("core.filemode", filemode ? "true" : "false");
257 if (is_bare_repository())
259 git_config_set("core.bare", "true");
260 else {
261 const char *work_tree = get_git_work_tree();
262 git_config_set("core.bare", "false");
263 /* allow template config file to override the default */
264 if (log_all_ref_updates == -1)
265 git_config_set("core.logallrefupdates", "true");
266 if (needs_work_tree_config(get_git_dir(), work_tree))
267 git_config_set("core.worktree", work_tree);
268 }
269 if (!reinit) {
271 /* Check if symlink is supported in the work tree */
272 path = git_path_buf(&buf, "tXXXXXX");
273 if (!close(xmkstemp(path)) &&
274 !unlink(path) &&
275 !symlink("testing", path) &&
276 !lstat(path, &st1) &&
277 S_ISLNK(st1.st_mode))
278 unlink(path); /* good */
279 else
280 git_config_set("core.symlinks", "false");
281 /* Check if the filesystem is case-insensitive */
283 path = git_path_buf(&buf, "CoNfIg");
284 if (!access(path, F_OK))
285 git_config_set("core.ignorecase", "true");
286 probe_utf8_pathname_composition();
287 }
288 strbuf_release(&buf);
290 return reinit;
291}
292static void create_object_directory(void)
294{
295 struct strbuf path = STRBUF_INIT;
296 size_t baselen;
297 strbuf_addstr(&path, get_object_directory());
299 baselen = path.len;
300 safe_create_dir(path.buf, 1);
302 strbuf_setlen(&path, baselen);
304 strbuf_addstr(&path, "/pack");
305 safe_create_dir(path.buf, 1);
306 strbuf_setlen(&path, baselen);
308 strbuf_addstr(&path, "/info");
309 safe_create_dir(path.buf, 1);
310 strbuf_release(&path);
312}
313int set_git_dir_init(const char *git_dir, const char *real_git_dir,
315 int exist_ok)
316{
317 if (real_git_dir) {
318 struct stat st;
319 if (!exist_ok && !stat(git_dir, &st))
321 die(_("%s already exists"), git_dir);
322 if (!exist_ok && !stat(real_git_dir, &st))
324 die(_("%s already exists"), real_git_dir);
325 /*
327 * make sure symlinks are resolved because we'll be
328 * moving the target repo later on in separate_git_dir()
329 */
330 git_link = xstrdup(real_path(git_dir));
331 set_git_dir(real_path(real_git_dir));
332 }
333 else {
334 set_git_dir(real_path(git_dir));
335 git_link = NULL;
336 }
337 startup_info->have_repository = 1;
338 return 0;
339}
340static void separate_git_dir(const char *git_dir)
342{
343 struct stat st;
344 if (!stat(git_link, &st)) {
346 const char *src;
347 if (S_ISREG(st.st_mode))
349 src = read_gitfile(git_link);
350 else if (S_ISDIR(st.st_mode))
351 src = git_link;
352 else
353 die(_("unable to handle file type %d"), (int)st.st_mode);
354 if (rename(src, git_dir))
356 die_errno(_("unable to move %s to %s"), src, git_dir);
357 }
358 write_file(git_link, "gitdir: %s", git_dir);
360}
361int init_db(const char *template_dir, unsigned int flags)
363{
364 int reinit;
365 const char *git_dir = get_git_dir();
366 if (git_link)
368 separate_git_dir(git_dir);
369 safe_create_dir(git_dir, 0);
371 init_is_bare_repository = is_bare_repository();
373 /* Check to see if the repository version is right.
375 * Note that a newly created repository does not have
376 * config file, so this will not fail. What we are catching
377 * is an attempt to reinitialize new repository with an old tool.
378 */
379 check_repository_format();
380 reinit = create_default_files(template_dir);
382 create_object_directory();
384 if (get_shared_repository()) {
386 char buf[10];
387 /* We do not spell "group" and such, so that
388 * the configuration can be read by older version
389 * of git. Note, we use octal numbers for new share modes,
390 * and compatibility values for PERM_GROUP and
391 * PERM_EVERYBODY.
392 */
393 if (get_shared_repository() < 0)
394 /* force to the mode value */
395 xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
396 else if (get_shared_repository() == PERM_GROUP)
397 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
398 else if (get_shared_repository() == PERM_EVERYBODY)
399 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
400 else
401 die("BUG: invalid value for shared_repository");
402 git_config_set("core.sharedrepository", buf);
403 git_config_set("receive.denyNonFastforwards", "true");
404 }
405 if (!(flags & INIT_DB_QUIET)) {
407 int len = strlen(git_dir);
408 /* TRANSLATORS: The first '%s' is either "Reinitialized
410 existing" or "Initialized empty", the second " shared" or
411 "", and the last '%s%s' is the verbatim directory name. */
412 printf(_("%s%s Git repository in %s%s\n"),
413 reinit ? _("Reinitialized existing") : _("Initialized empty"),
414 get_shared_repository() ? _(" shared") : "",
415 git_dir, len && git_dir[len-1] != '/' ? "/" : "");
416 }
417 return 0;
419}
420static int guess_repository_type(const char *git_dir)
422{
423 const char *slash;
424 char *cwd;
425 int cwd_is_git_dir;
426 /*
428 * "GIT_DIR=. git init" is always bare.
429 * "GIT_DIR=`pwd` git init" too.
430 */
431 if (!strcmp(".", git_dir))
432 return 1;
433 cwd = xgetcwd();
434 cwd_is_git_dir = !strcmp(git_dir, cwd);
435 free(cwd);
436 if (cwd_is_git_dir)
437 return 1;
438 /*
439 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
440 */
441 if (!strcmp(git_dir, ".git"))
442 return 0;
443 slash = strrchr(git_dir, '/');
444 if (slash && !strcmp(slash, "/.git"))
445 return 0;
446 /*
448 * Otherwise it is often bare. At this point
449 * we are just guessing.
450 */
451 return 1;
452}
453static int shared_callback(const struct option *opt, const char *arg, int unset)
455{
456 *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
457 return 0;
458}
459static const char *const init_db_usage[] = {
461 N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
462 NULL
463};
464/*
466 * If you want to, you can share the DB area with any number of branches.
467 * That has advantages: you can save space by sharing all the SHA1 objects.
468 * On the other hand, it might just make lookup slower and messier. You
469 * be the judge. The default case is to have one DB per managed directory.
470 */
471int cmd_init_db(int argc, const char **argv, const char *prefix)
472{
473 const char *git_dir;
474 const char *real_git_dir = NULL;
475 const char *work_tree;
476 const char *template_dir = NULL;
477 unsigned int flags = 0;
478 const struct option init_db_options[] = {
479 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
480 N_("directory from which templates will be used")),
481 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
482 N_("create a bare repository"), 1),
483 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
484 N_("permissions"),
485 N_("specify that the git repository is to be shared amongst several users"),
486 PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
487 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
488 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
489 N_("separate git dir from working tree")),
490 OPT_END()
491 };
492 argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
494 if (real_git_dir && !is_absolute_path(real_git_dir))
496 real_git_dir = xstrdup(real_path(real_git_dir));
497 if (argc == 1) {
499 int mkdir_tried = 0;
500 retry:
501 if (chdir(argv[0]) < 0) {
502 if (!mkdir_tried) {
503 int saved;
504 /*
505 * At this point we haven't read any configuration,
506 * and we know shared_repository should always be 0;
507 * but just in case we play safe.
508 */
509 saved = get_shared_repository();
510 set_shared_repository(0);
511 switch (safe_create_leading_directories_const(argv[0])) {
512 case SCLD_OK:
513 case SCLD_PERMS:
514 break;
515 case SCLD_EXISTS:
516 errno = EEXIST;
517 /* fallthru */
518 default:
519 die_errno(_("cannot mkdir %s"), argv[0]);
520 break;
521 }
522 set_shared_repository(saved);
523 if (mkdir(argv[0], 0777) < 0)
524 die_errno(_("cannot mkdir %s"), argv[0]);
525 mkdir_tried = 1;
526 goto retry;
527 }
528 die_errno(_("cannot chdir to %s"), argv[0]);
529 }
530 } else if (0 < argc) {
531 usage(init_db_usage[0]);
532 }
533 if (is_bare_repository_cfg == 1) {
534 char *cwd = xgetcwd();
535 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
536 free(cwd);
537 }
538 if (init_shared_repository != -1)
540 set_shared_repository(init_shared_repository);
541 /*
543 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
544 * without --bare. Catch the error early.
545 */
546 git_dir = getenv(GIT_DIR_ENVIRONMENT);
547 work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
548 if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
549 die(_("%s (or --work-tree=<directory>) not allowed without "
550 "specifying %s (or --git-dir=<directory>)"),
551 GIT_WORK_TREE_ENVIRONMENT,
552 GIT_DIR_ENVIRONMENT);
553 /*
555 * Set up the default .git directory contents
556 */
557 if (!git_dir)
558 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
559 if (is_bare_repository_cfg < 0)
561 is_bare_repository_cfg = guess_repository_type(git_dir);
562 if (!is_bare_repository_cfg) {
564 const char *git_dir_parent = strrchr(git_dir, '/');
565 if (git_dir_parent) {
566 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
567 git_work_tree_cfg = xstrdup(real_path(rel));
568 free(rel);
569 }
570 if (!git_work_tree_cfg)
571 git_work_tree_cfg = xgetcwd();
572 if (work_tree)
573 set_git_work_tree(work_tree);
574 else
575 set_git_work_tree(git_work_tree_cfg);
576 if (access(get_git_work_tree(), X_OK))
577 die_errno (_("Cannot access work tree '%s'"),
578 get_git_work_tree());
579 }
580 else {
581 if (work_tree)
582 set_git_work_tree(work_tree);
583 }
584 set_git_dir_init(git_dir, real_git_dir, 1);
586 return init_db(template_dir, flags);
588}