Merge branch 'nd/init-core-worktree-in-multi-worktree-world'
[git/git.git] / 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 "refs.h"
8 #include "builtin.h"
9 #include "exec_cmd.h"
10 #include "parse-options.h"
11
12 #ifndef DEFAULT_GIT_TEMPLATE_DIR
13 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
14 #endif
15
16 #ifdef NO_TRUSTABLE_FILEMODE
17 #define TEST_FILEMODE 0
18 #else
19 #define TEST_FILEMODE 1
20 #endif
21
22 static int init_is_bare_repository = 0;
23 static int init_shared_repository = -1;
24 static const char *init_db_template_dir;
25
26 static void copy_templates_1(struct strbuf *path, struct strbuf *template,
27 DIR *dir)
28 {
29 size_t path_baselen = path->len;
30 size_t template_baselen = template->len;
31 struct dirent *de;
32
33 /* Note: if ".git/hooks" file exists in the repository being
34 * re-initialized, /etc/core-git/templates/hooks/update would
35 * cause "git init" to fail here. I think this is sane but
36 * it means that the set of templates we ship by default, along
37 * with the way the namespace under .git/ is organized, should
38 * be really carefully chosen.
39 */
40 safe_create_dir(path->buf, 1);
41 while ((de = readdir(dir)) != NULL) {
42 struct stat st_git, st_template;
43 int exists = 0;
44
45 strbuf_setlen(path, path_baselen);
46 strbuf_setlen(template, template_baselen);
47
48 if (de->d_name[0] == '.')
49 continue;
50 strbuf_addstr(path, de->d_name);
51 strbuf_addstr(template, de->d_name);
52 if (lstat(path->buf, &st_git)) {
53 if (errno != ENOENT)
54 die_errno(_("cannot stat '%s'"), path->buf);
55 }
56 else
57 exists = 1;
58
59 if (lstat(template->buf, &st_template))
60 die_errno(_("cannot stat template '%s'"), template->buf);
61
62 if (S_ISDIR(st_template.st_mode)) {
63 DIR *subdir = opendir(template->buf);
64 if (!subdir)
65 die_errno(_("cannot opendir '%s'"), template->buf);
66 strbuf_addch(path, '/');
67 strbuf_addch(template, '/');
68 copy_templates_1(path, template, subdir);
69 closedir(subdir);
70 }
71 else if (exists)
72 continue;
73 else if (S_ISLNK(st_template.st_mode)) {
74 struct strbuf lnk = STRBUF_INIT;
75 if (strbuf_readlink(&lnk, template->buf, 0) < 0)
76 die_errno(_("cannot readlink '%s'"), template->buf);
77 if (symlink(lnk.buf, path->buf))
78 die_errno(_("cannot symlink '%s' '%s'"),
79 lnk.buf, path->buf);
80 strbuf_release(&lnk);
81 }
82 else if (S_ISREG(st_template.st_mode)) {
83 if (copy_file(path->buf, template->buf, st_template.st_mode))
84 die_errno(_("cannot copy '%s' to '%s'"),
85 template->buf, path->buf);
86 }
87 else
88 error(_("ignoring template %s"), template->buf);
89 }
90 }
91
92 static void copy_templates(const char *template_dir)
93 {
94 struct strbuf path = STRBUF_INIT;
95 struct strbuf template_path = STRBUF_INIT;
96 size_t template_len;
97 struct repository_format template_format;
98 struct strbuf err = STRBUF_INIT;
99 DIR *dir;
100 char *to_free = NULL;
101
102 if (!template_dir)
103 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
104 if (!template_dir)
105 template_dir = init_db_template_dir;
106 if (!template_dir)
107 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
108 if (!template_dir[0]) {
109 free(to_free);
110 return;
111 }
112
113 strbuf_addstr(&template_path, template_dir);
114 strbuf_complete(&template_path, '/');
115 template_len = template_path.len;
116
117 dir = opendir(template_path.buf);
118 if (!dir) {
119 warning(_("templates not found %s"), template_dir);
120 goto free_return;
121 }
122
123 /* Make sure that template is from the correct vintage */
124 strbuf_addstr(&template_path, "config");
125 read_repository_format(&template_format, template_path.buf);
126 strbuf_setlen(&template_path, template_len);
127
128 /*
129 * No mention of version at all is OK, but anything else should be
130 * verified.
131 */
132 if (template_format.version >= 0 &&
133 verify_repository_format(&template_format, &err) < 0) {
134 warning(_("not copying templates from '%s': %s"),
135 template_dir, err.buf);
136 strbuf_release(&err);
137 goto close_free_return;
138 }
139
140 strbuf_addstr(&path, get_git_common_dir());
141 strbuf_complete(&path, '/');
142 copy_templates_1(&path, &template_path, dir);
143 close_free_return:
144 closedir(dir);
145 free_return:
146 free(to_free);
147 strbuf_release(&path);
148 strbuf_release(&template_path);
149 }
150
151 static int git_init_db_config(const char *k, const char *v, void *cb)
152 {
153 if (!strcmp(k, "init.templatedir"))
154 return git_config_pathname(&init_db_template_dir, k, v);
155
156 return 0;
157 }
158
159 /*
160 * If the git_dir is not directly inside the working tree, then git will not
161 * find it by default, and we need to set the worktree explicitly.
162 */
163 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
164 {
165 if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
166 return 0;
167 if (skip_prefix(git_dir, work_tree, &git_dir) &&
168 !strcmp(git_dir, "/.git"))
169 return 0;
170 return 1;
171 }
172
173 static int create_default_files(const char *template_path,
174 const char *original_git_dir)
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 struct strbuf err = STRBUF_INIT;
184
185 /* Just look for `init.templatedir` */
186 git_config(git_init_db_config, NULL);
187
188 /*
189 * First copy the templates -- we might have the default
190 * config file there, in which case we would want to read
191 * from it after installing.
192 *
193 * Before reading that config, we also need to clear out any cached
194 * values (since we've just potentially changed what's available on
195 * disk).
196 */
197 copy_templates(template_path);
198 git_config_clear();
199 reset_shared_repository();
200 git_config(git_default_config, NULL);
201
202 /*
203 * We must make sure command-line options continue to override any
204 * values we might have just re-read from the config.
205 */
206 is_bare_repository_cfg = init_is_bare_repository;
207 if (init_shared_repository != -1)
208 set_shared_repository(init_shared_repository);
209
210 /*
211 * We would have created the above under user's umask -- under
212 * shared-repository settings, we would need to fix them up.
213 */
214 if (get_shared_repository()) {
215 adjust_shared_perm(get_git_dir());
216 }
217
218 /*
219 * We need to create a "refs" dir in any case so that older
220 * versions of git can tell that this is a repository.
221 */
222 safe_create_dir(git_path("refs"), 1);
223 adjust_shared_perm(git_path("refs"));
224
225 if (refs_init_db(&err))
226 die("failed to set up refs db: %s", err.buf);
227
228 /*
229 * Create the default symlink from ".git/HEAD" to the "master"
230 * branch, if it does not exist yet.
231 */
232 path = git_path_buf(&buf, "HEAD");
233 reinit = (!access(path, R_OK)
234 || readlink(path, junk, sizeof(junk)-1) != -1);
235 if (!reinit) {
236 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
237 exit(1);
238 }
239
240 /* This forces creation of new config file */
241 xsnprintf(repo_version_string, sizeof(repo_version_string),
242 "%d", GIT_REPO_VERSION);
243 git_config_set("core.repositoryformatversion", repo_version_string);
244
245 /* Check filemode trustability */
246 path = git_path_buf(&buf, "config");
247 filemode = TEST_FILEMODE;
248 if (TEST_FILEMODE && !lstat(path, &st1)) {
249 struct stat st2;
250 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
251 !lstat(path, &st2) &&
252 st1.st_mode != st2.st_mode &&
253 !chmod(path, st1.st_mode));
254 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
255 filemode = 0;
256 }
257 git_config_set("core.filemode", filemode ? "true" : "false");
258
259 if (is_bare_repository())
260 git_config_set("core.bare", "true");
261 else {
262 const char *work_tree = get_git_work_tree();
263 git_config_set("core.bare", "false");
264 /* allow template config file to override the default */
265 if (log_all_ref_updates == -1)
266 git_config_set("core.logallrefupdates", "true");
267 if (needs_work_tree_config(original_git_dir, work_tree))
268 git_config_set("core.worktree", work_tree);
269 }
270
271 if (!reinit) {
272 /* Check if symlink is supported in the work tree */
273 path = git_path_buf(&buf, "tXXXXXX");
274 if (!close(xmkstemp(path)) &&
275 !unlink(path) &&
276 !symlink("testing", path) &&
277 !lstat(path, &st1) &&
278 S_ISLNK(st1.st_mode))
279 unlink(path); /* good */
280 else
281 git_config_set("core.symlinks", "false");
282
283 /* Check if the filesystem is case-insensitive */
284 path = git_path_buf(&buf, "CoNfIg");
285 if (!access(path, F_OK))
286 git_config_set("core.ignorecase", "true");
287 probe_utf8_pathname_composition();
288 }
289
290 strbuf_release(&buf);
291 return reinit;
292 }
293
294 static void create_object_directory(void)
295 {
296 struct strbuf path = STRBUF_INIT;
297 size_t baselen;
298
299 strbuf_addstr(&path, get_object_directory());
300 baselen = path.len;
301
302 safe_create_dir(path.buf, 1);
303
304 strbuf_setlen(&path, baselen);
305 strbuf_addstr(&path, "/pack");
306 safe_create_dir(path.buf, 1);
307
308 strbuf_setlen(&path, baselen);
309 strbuf_addstr(&path, "/info");
310 safe_create_dir(path.buf, 1);
311
312 strbuf_release(&path);
313 }
314
315 static void separate_git_dir(const char *git_dir, const char *git_link)
316 {
317 struct stat st;
318
319 if (!stat(git_link, &st)) {
320 const char *src;
321
322 if (S_ISREG(st.st_mode))
323 src = read_gitfile(git_link);
324 else if (S_ISDIR(st.st_mode))
325 src = git_link;
326 else
327 die(_("unable to handle file type %d"), (int)st.st_mode);
328
329 if (rename(src, git_dir))
330 die_errno(_("unable to move %s to %s"), src, git_dir);
331 }
332
333 write_file(git_link, "gitdir: %s", git_dir);
334 }
335
336 int init_db(const char *git_dir, const char *real_git_dir,
337 const char *template_dir, unsigned int flags)
338 {
339 int reinit;
340 int exist_ok = flags & INIT_DB_EXIST_OK;
341 char *original_git_dir = xstrdup(real_path(git_dir));
342
343 if (real_git_dir) {
344 struct stat st;
345
346 if (!exist_ok && !stat(git_dir, &st))
347 die(_("%s already exists"), git_dir);
348
349 if (!exist_ok && !stat(real_git_dir, &st))
350 die(_("%s already exists"), real_git_dir);
351
352 set_git_dir(real_path(real_git_dir));
353 git_dir = get_git_dir();
354 separate_git_dir(git_dir, original_git_dir);
355 }
356 else {
357 set_git_dir(real_path(git_dir));
358 git_dir = get_git_dir();
359 }
360 startup_info->have_repository = 1;
361
362 safe_create_dir(git_dir, 0);
363
364 init_is_bare_repository = is_bare_repository();
365
366 /* Check to see if the repository version is right.
367 * Note that a newly created repository does not have
368 * config file, so this will not fail. What we are catching
369 * is an attempt to reinitialize new repository with an old tool.
370 */
371 check_repository_format();
372
373 reinit = create_default_files(template_dir, original_git_dir);
374
375 create_object_directory();
376
377 if (get_shared_repository()) {
378 char buf[10];
379 /* We do not spell "group" and such, so that
380 * the configuration can be read by older version
381 * of git. Note, we use octal numbers for new share modes,
382 * and compatibility values for PERM_GROUP and
383 * PERM_EVERYBODY.
384 */
385 if (get_shared_repository() < 0)
386 /* force to the mode value */
387 xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
388 else if (get_shared_repository() == PERM_GROUP)
389 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
390 else if (get_shared_repository() == PERM_EVERYBODY)
391 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
392 else
393 die("BUG: invalid value for shared_repository");
394 git_config_set("core.sharedrepository", buf);
395 git_config_set("receive.denyNonFastforwards", "true");
396 }
397
398 if (!(flags & INIT_DB_QUIET)) {
399 int len = strlen(git_dir);
400
401 if (reinit)
402 printf(get_shared_repository()
403 ? _("Reinitialized existing shared Git repository in %s%s\n")
404 : _("Reinitialized existing Git repository in %s%s\n"),
405 git_dir, len && git_dir[len-1] != '/' ? "/" : "");
406 else
407 printf(get_shared_repository()
408 ? _("Initialized empty shared Git repository in %s%s\n")
409 : _("Initialized empty Git repository in %s%s\n"),
410 git_dir, len && git_dir[len-1] != '/' ? "/" : "");
411 }
412
413 free(original_git_dir);
414 return 0;
415 }
416
417 static int guess_repository_type(const char *git_dir)
418 {
419 const char *slash;
420 char *cwd;
421 int cwd_is_git_dir;
422
423 /*
424 * "GIT_DIR=. git init" is always bare.
425 * "GIT_DIR=`pwd` git init" too.
426 */
427 if (!strcmp(".", git_dir))
428 return 1;
429 cwd = xgetcwd();
430 cwd_is_git_dir = !strcmp(git_dir, cwd);
431 free(cwd);
432 if (cwd_is_git_dir)
433 return 1;
434 /*
435 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
436 */
437 if (!strcmp(git_dir, ".git"))
438 return 0;
439 slash = strrchr(git_dir, '/');
440 if (slash && !strcmp(slash, "/.git"))
441 return 0;
442
443 /*
444 * Otherwise it is often bare. At this point
445 * we are just guessing.
446 */
447 return 1;
448 }
449
450 static int shared_callback(const struct option *opt, const char *arg, int unset)
451 {
452 *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
453 return 0;
454 }
455
456 static const char *const init_db_usage[] = {
457 N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
458 NULL
459 };
460
461 /*
462 * If you want to, you can share the DB area with any number of branches.
463 * That has advantages: you can save space by sharing all the SHA1 objects.
464 * On the other hand, it might just make lookup slower and messier. You
465 * be the judge. The default case is to have one DB per managed directory.
466 */
467 int cmd_init_db(int argc, const char **argv, const char *prefix)
468 {
469 const char *git_dir;
470 const char *real_git_dir = NULL;
471 const char *work_tree;
472 const char *template_dir = NULL;
473 unsigned int flags = 0;
474 const struct option init_db_options[] = {
475 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
476 N_("directory from which templates will be used")),
477 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
478 N_("create a bare repository"), 1),
479 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
480 N_("permissions"),
481 N_("specify that the git repository is to be shared amongst several users"),
482 PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
483 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
484 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
485 N_("separate git dir from working tree")),
486 OPT_END()
487 };
488
489 argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
490
491 if (real_git_dir && !is_absolute_path(real_git_dir))
492 real_git_dir = xstrdup(real_path(real_git_dir));
493
494 if (argc == 1) {
495 int mkdir_tried = 0;
496 retry:
497 if (chdir(argv[0]) < 0) {
498 if (!mkdir_tried) {
499 int saved;
500 /*
501 * At this point we haven't read any configuration,
502 * and we know shared_repository should always be 0;
503 * but just in case we play safe.
504 */
505 saved = get_shared_repository();
506 set_shared_repository(0);
507 switch (safe_create_leading_directories_const(argv[0])) {
508 case SCLD_OK:
509 case SCLD_PERMS:
510 break;
511 case SCLD_EXISTS:
512 errno = EEXIST;
513 /* fallthru */
514 default:
515 die_errno(_("cannot mkdir %s"), argv[0]);
516 break;
517 }
518 set_shared_repository(saved);
519 if (mkdir(argv[0], 0777) < 0)
520 die_errno(_("cannot mkdir %s"), argv[0]);
521 mkdir_tried = 1;
522 goto retry;
523 }
524 die_errno(_("cannot chdir to %s"), argv[0]);
525 }
526 } else if (0 < argc) {
527 usage(init_db_usage[0]);
528 }
529 if (is_bare_repository_cfg == 1) {
530 char *cwd = xgetcwd();
531 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
532 free(cwd);
533 }
534
535 if (init_shared_repository != -1)
536 set_shared_repository(init_shared_repository);
537
538 /*
539 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
540 * without --bare. Catch the error early.
541 */
542 git_dir = getenv(GIT_DIR_ENVIRONMENT);
543 work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
544 if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
545 die(_("%s (or --work-tree=<directory>) not allowed without "
546 "specifying %s (or --git-dir=<directory>)"),
547 GIT_WORK_TREE_ENVIRONMENT,
548 GIT_DIR_ENVIRONMENT);
549
550 /*
551 * Set up the default .git directory contents
552 */
553 if (!git_dir)
554 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
555
556 if (is_bare_repository_cfg < 0)
557 is_bare_repository_cfg = guess_repository_type(git_dir);
558
559 if (!is_bare_repository_cfg) {
560 const char *git_dir_parent = strrchr(git_dir, '/');
561 if (git_dir_parent) {
562 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
563 git_work_tree_cfg = xstrdup(real_path(rel));
564 free(rel);
565 }
566 if (!git_work_tree_cfg)
567 git_work_tree_cfg = xgetcwd();
568 if (work_tree)
569 set_git_work_tree(work_tree);
570 else
571 set_git_work_tree(git_work_tree_cfg);
572 if (access(get_git_work_tree(), X_OK))
573 die_errno (_("Cannot access work tree '%s'"),
574 get_git_work_tree());
575 }
576 else {
577 if (work_tree)
578 set_git_work_tree(work_tree);
579 }
580
581 flags |= INIT_DB_EXIST_OK;
582 return init_db(git_dir, real_git_dir, template_dir, flags);
583 }