Merge branch 'dl/subtree-limit-to-one-rev'
[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 "config.h"
8 #include "refs.h"
9 #include "builtin.h"
10 #include "exec-cmd.h"
11 #include "parse-options.h"
12
13 #ifndef DEFAULT_GIT_TEMPLATE_DIR
14 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
15 #endif
16
17 #ifdef NO_TRUSTABLE_FILEMODE
18 #define TEST_FILEMODE 0
19 #else
20 #define TEST_FILEMODE 1
21 #endif
22
23 static int init_is_bare_repository = 0;
24 static int init_shared_repository = -1;
25 static const char *init_db_template_dir;
26
27 static void copy_templates_1(struct strbuf *path, struct strbuf *template_path,
28 DIR *dir)
29 {
30 size_t path_baselen = path->len;
31 size_t template_baselen = template_path->len;
32 struct dirent *de;
33
34 /* 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
46 strbuf_setlen(path, path_baselen);
47 strbuf_setlen(template_path, template_baselen);
48
49 if (de->d_name[0] == '.')
50 continue;
51 strbuf_addstr(path, de->d_name);
52 strbuf_addstr(template_path, 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
60 if (lstat(template_path->buf, &st_template))
61 die_errno(_("cannot stat template '%s'"), template_path->buf);
62
63 if (S_ISDIR(st_template.st_mode)) {
64 DIR *subdir = opendir(template_path->buf);
65 if (!subdir)
66 die_errno(_("cannot opendir '%s'"), template_path->buf);
67 strbuf_addch(path, '/');
68 strbuf_addch(template_path, '/');
69 copy_templates_1(path, template_path, 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_path->buf,
77 st_template.st_size) < 0)
78 die_errno(_("cannot readlink '%s'"), template_path->buf);
79 if (symlink(lnk.buf, path->buf))
80 die_errno(_("cannot symlink '%s' '%s'"),
81 lnk.buf, path->buf);
82 strbuf_release(&lnk);
83 }
84 else if (S_ISREG(st_template.st_mode)) {
85 if (copy_file(path->buf, template_path->buf, st_template.st_mode))
86 die_errno(_("cannot copy '%s' to '%s'"),
87 template_path->buf, path->buf);
88 }
89 else
90 error(_("ignoring template %s"), template_path->buf);
91 }
92 }
93
94 static void copy_templates(const char *template_dir)
95 {
96 struct strbuf path = STRBUF_INIT;
97 struct strbuf template_path = STRBUF_INIT;
98 size_t template_len;
99 struct repository_format template_format = REPOSITORY_FORMAT_INIT;
100 struct strbuf err = STRBUF_INIT;
101 DIR *dir;
102 char *to_free = NULL;
103
104 if (!template_dir)
105 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
106 if (!template_dir)
107 template_dir = init_db_template_dir;
108 if (!template_dir)
109 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
110 if (!template_dir[0]) {
111 free(to_free);
112 return;
113 }
114
115 strbuf_addstr(&template_path, template_dir);
116 strbuf_complete(&template_path, '/');
117 template_len = template_path.len;
118
119 dir = opendir(template_path.buf);
120 if (!dir) {
121 warning(_("templates not found in %s"), template_dir);
122 goto free_return;
123 }
124
125 /* Make sure that template is from the correct vintage */
126 strbuf_addstr(&template_path, "config");
127 read_repository_format(&template_format, template_path.buf);
128 strbuf_setlen(&template_path, template_len);
129
130 /*
131 * No mention of version at all is OK, but anything else should be
132 * verified.
133 */
134 if (template_format.version >= 0 &&
135 verify_repository_format(&template_format, &err) < 0) {
136 warning(_("not copying templates from '%s': %s"),
137 template_dir, err.buf);
138 strbuf_release(&err);
139 goto close_free_return;
140 }
141
142 strbuf_addstr(&path, get_git_common_dir());
143 strbuf_complete(&path, '/');
144 copy_templates_1(&path, &template_path, dir);
145 close_free_return:
146 closedir(dir);
147 free_return:
148 free(to_free);
149 strbuf_release(&path);
150 strbuf_release(&template_path);
151 clear_repository_format(&template_format);
152 }
153
154 static int git_init_db_config(const char *k, const char *v, void *cb)
155 {
156 if (!strcmp(k, "init.templatedir"))
157 return git_config_pathname(&init_db_template_dir, k, v);
158
159 if (starts_with(k, "core."))
160 return platform_core_config(k, v, cb);
161
162 return 0;
163 }
164
165 /*
166 * If the git_dir is not directly inside the working tree, then git will not
167 * find it by default, and we need to set the worktree explicitly.
168 */
169 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
170 {
171 if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
172 return 0;
173 if (skip_prefix(git_dir, work_tree, &git_dir) &&
174 !strcmp(git_dir, "/.git"))
175 return 0;
176 return 1;
177 }
178
179 static int create_default_files(const char *template_path,
180 const char *original_git_dir)
181 {
182 struct stat st1;
183 struct strbuf buf = STRBUF_INIT;
184 char *path;
185 char repo_version_string[10];
186 char junk[2];
187 int reinit;
188 int filemode;
189 struct strbuf err = STRBUF_INIT;
190
191 /* Just look for `init.templatedir` */
192 init_db_template_dir = NULL; /* re-set in case it was set before */
193 git_config(git_init_db_config, NULL);
194
195 /*
196 * First copy the templates -- we might have the default
197 * config file there, in which case we would want to read
198 * from it after installing.
199 *
200 * Before reading that config, we also need to clear out any cached
201 * values (since we've just potentially changed what's available on
202 * disk).
203 */
204 copy_templates(template_path);
205 git_config_clear();
206 reset_shared_repository();
207 git_config(git_default_config, NULL);
208
209 /*
210 * We must make sure command-line options continue to override any
211 * values we might have just re-read from the config.
212 */
213 is_bare_repository_cfg = init_is_bare_repository;
214 if (init_shared_repository != -1)
215 set_shared_repository(init_shared_repository);
216
217 /*
218 * We would have created the above under user's umask -- under
219 * shared-repository settings, we would need to fix them up.
220 */
221 if (get_shared_repository()) {
222 adjust_shared_perm(get_git_dir());
223 }
224
225 /*
226 * We need to create a "refs" dir in any case so that older
227 * versions of git can tell that this is a repository.
228 */
229 safe_create_dir(git_path("refs"), 1);
230 adjust_shared_perm(git_path("refs"));
231
232 if (refs_init_db(&err))
233 die("failed to set up refs db: %s", err.buf);
234
235 /*
236 * Create the default symlink from ".git/HEAD" to the "master"
237 * branch, if it does not exist yet.
238 */
239 path = git_path_buf(&buf, "HEAD");
240 reinit = (!access(path, R_OK)
241 || readlink(path, junk, sizeof(junk)-1) != -1);
242 if (!reinit) {
243 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
244 exit(1);
245 }
246
247 /* This forces creation of new config file */
248 xsnprintf(repo_version_string, sizeof(repo_version_string),
249 "%d", GIT_REPO_VERSION);
250 git_config_set("core.repositoryformatversion", repo_version_string);
251
252 /* Check filemode trustability */
253 path = git_path_buf(&buf, "config");
254 filemode = TEST_FILEMODE;
255 if (TEST_FILEMODE && !lstat(path, &st1)) {
256 struct stat st2;
257 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
258 !lstat(path, &st2) &&
259 st1.st_mode != st2.st_mode &&
260 !chmod(path, st1.st_mode));
261 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
262 filemode = 0;
263 }
264 git_config_set("core.filemode", filemode ? "true" : "false");
265
266 if (is_bare_repository())
267 git_config_set("core.bare", "true");
268 else {
269 const char *work_tree = get_git_work_tree();
270 git_config_set("core.bare", "false");
271 /* allow template config file to override the default */
272 if (log_all_ref_updates == LOG_REFS_UNSET)
273 git_config_set("core.logallrefupdates", "true");
274 if (needs_work_tree_config(original_git_dir, work_tree))
275 git_config_set("core.worktree", work_tree);
276 }
277
278 if (!reinit) {
279 /* Check if symlink is supported in the work tree */
280 path = git_path_buf(&buf, "tXXXXXX");
281 if (!close(xmkstemp(path)) &&
282 !unlink(path) &&
283 !symlink("testing", path) &&
284 !lstat(path, &st1) &&
285 S_ISLNK(st1.st_mode))
286 unlink(path); /* good */
287 else
288 git_config_set("core.symlinks", "false");
289
290 /* Check if the filesystem is case-insensitive */
291 path = git_path_buf(&buf, "CoNfIg");
292 if (!access(path, F_OK))
293 git_config_set("core.ignorecase", "true");
294 probe_utf8_pathname_composition();
295 }
296
297 strbuf_release(&buf);
298 return reinit;
299 }
300
301 static void create_object_directory(void)
302 {
303 struct strbuf path = STRBUF_INIT;
304 size_t baselen;
305
306 strbuf_addstr(&path, get_object_directory());
307 baselen = path.len;
308
309 safe_create_dir(path.buf, 1);
310
311 strbuf_setlen(&path, baselen);
312 strbuf_addstr(&path, "/pack");
313 safe_create_dir(path.buf, 1);
314
315 strbuf_setlen(&path, baselen);
316 strbuf_addstr(&path, "/info");
317 safe_create_dir(path.buf, 1);
318
319 strbuf_release(&path);
320 }
321
322 static void separate_git_dir(const char *git_dir, const char *git_link)
323 {
324 struct stat st;
325
326 if (!stat(git_link, &st)) {
327 const char *src;
328
329 if (S_ISREG(st.st_mode))
330 src = read_gitfile(git_link);
331 else if (S_ISDIR(st.st_mode))
332 src = git_link;
333 else
334 die(_("unable to handle file type %d"), (int)st.st_mode);
335
336 if (rename(src, git_dir))
337 die_errno(_("unable to move %s to %s"), src, git_dir);
338 }
339
340 write_file(git_link, "gitdir: %s", git_dir);
341 }
342
343 int init_db(const char *git_dir, const char *real_git_dir,
344 const char *template_dir, unsigned int flags)
345 {
346 int reinit;
347 int exist_ok = flags & INIT_DB_EXIST_OK;
348 char *original_git_dir = real_pathdup(git_dir, 1);
349
350 if (real_git_dir) {
351 struct stat st;
352
353 if (!exist_ok && !stat(git_dir, &st))
354 die(_("%s already exists"), git_dir);
355
356 if (!exist_ok && !stat(real_git_dir, &st))
357 die(_("%s already exists"), real_git_dir);
358
359 set_git_dir(real_path(real_git_dir));
360 git_dir = get_git_dir();
361 separate_git_dir(git_dir, original_git_dir);
362 }
363 else {
364 set_git_dir(real_path(git_dir));
365 git_dir = get_git_dir();
366 }
367 startup_info->have_repository = 1;
368
369 /* Just look for `core.hidedotfiles` */
370 git_config(git_init_db_config, NULL);
371
372 safe_create_dir(git_dir, 0);
373
374 init_is_bare_repository = is_bare_repository();
375
376 /* Check to see if the repository version is right.
377 * Note that a newly created repository does not have
378 * config file, so this will not fail. What we are catching
379 * is an attempt to reinitialize new repository with an old tool.
380 */
381 check_repository_format();
382
383 reinit = create_default_files(template_dir, original_git_dir);
384
385 create_object_directory();
386
387 if (get_shared_repository()) {
388 char buf[10];
389 /* We do not spell "group" and such, so that
390 * the configuration can be read by older version
391 * of git. Note, we use octal numbers for new share modes,
392 * and compatibility values for PERM_GROUP and
393 * PERM_EVERYBODY.
394 */
395 if (get_shared_repository() < 0)
396 /* force to the mode value */
397 xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
398 else if (get_shared_repository() == PERM_GROUP)
399 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
400 else if (get_shared_repository() == PERM_EVERYBODY)
401 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
402 else
403 BUG("invalid value for shared_repository");
404 git_config_set("core.sharedrepository", buf);
405 git_config_set("receive.denyNonFastforwards", "true");
406 }
407
408 if (!(flags & INIT_DB_QUIET)) {
409 int len = strlen(git_dir);
410
411 if (reinit)
412 printf(get_shared_repository()
413 ? _("Reinitialized existing shared Git repository in %s%s\n")
414 : _("Reinitialized existing Git repository in %s%s\n"),
415 git_dir, len && git_dir[len-1] != '/' ? "/" : "");
416 else
417 printf(get_shared_repository()
418 ? _("Initialized empty shared Git repository in %s%s\n")
419 : _("Initialized empty Git repository in %s%s\n"),
420 git_dir, len && git_dir[len-1] != '/' ? "/" : "");
421 }
422
423 free(original_git_dir);
424 return 0;
425 }
426
427 static int guess_repository_type(const char *git_dir)
428 {
429 const char *slash;
430 char *cwd;
431 int cwd_is_git_dir;
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 cwd = xgetcwd();
440 cwd_is_git_dir = !strcmp(git_dir, cwd);
441 free(cwd);
442 if (cwd_is_git_dir)
443 return 1;
444 /*
445 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
446 */
447 if (!strcmp(git_dir, ".git"))
448 return 0;
449 slash = strrchr(git_dir, '/');
450 if (slash && !strcmp(slash, "/.git"))
451 return 0;
452
453 /*
454 * Otherwise it is often bare. At this point
455 * we are just guessing.
456 */
457 return 1;
458 }
459
460 static int shared_callback(const struct option *opt, const char *arg, int unset)
461 {
462 BUG_ON_OPT_NEG(unset);
463 *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
464 return 0;
465 }
466
467 static const char *const init_db_usage[] = {
468 N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
469 NULL
470 };
471
472 /*
473 * If you want to, you can share the DB area with any number of branches.
474 * That has advantages: you can save space by sharing all the SHA1 objects.
475 * On the other hand, it might just make lookup slower and messier. You
476 * be the judge. The default case is to have one DB per managed directory.
477 */
478 int cmd_init_db(int argc, const char **argv, const char *prefix)
479 {
480 const char *git_dir;
481 const char *real_git_dir = NULL;
482 const char *work_tree;
483 const char *template_dir = NULL;
484 unsigned int flags = 0;
485 const struct option init_db_options[] = {
486 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
487 N_("directory from which templates will be used")),
488 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
489 N_("create a bare repository"), 1),
490 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
491 N_("permissions"),
492 N_("specify that the git repository is to be shared amongst several users"),
493 PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
494 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
495 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
496 N_("separate git dir from working tree")),
497 OPT_END()
498 };
499
500 argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
501
502 if (real_git_dir && !is_absolute_path(real_git_dir))
503 real_git_dir = real_pathdup(real_git_dir, 1);
504
505 if (argc == 1) {
506 int mkdir_tried = 0;
507 retry:
508 if (chdir(argv[0]) < 0) {
509 if (!mkdir_tried) {
510 int saved;
511 /*
512 * At this point we haven't read any configuration,
513 * and we know shared_repository should always be 0;
514 * but just in case we play safe.
515 */
516 saved = get_shared_repository();
517 set_shared_repository(0);
518 switch (safe_create_leading_directories_const(argv[0])) {
519 case SCLD_OK:
520 case SCLD_PERMS:
521 break;
522 case SCLD_EXISTS:
523 errno = EEXIST;
524 /* fallthru */
525 default:
526 die_errno(_("cannot mkdir %s"), argv[0]);
527 break;
528 }
529 set_shared_repository(saved);
530 if (mkdir(argv[0], 0777) < 0)
531 die_errno(_("cannot mkdir %s"), argv[0]);
532 mkdir_tried = 1;
533 goto retry;
534 }
535 die_errno(_("cannot chdir to %s"), argv[0]);
536 }
537 } else if (0 < argc) {
538 usage(init_db_usage[0]);
539 }
540 if (is_bare_repository_cfg == 1) {
541 char *cwd = xgetcwd();
542 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
543 free(cwd);
544 }
545
546 if (init_shared_repository != -1)
547 set_shared_repository(init_shared_repository);
548
549 /*
550 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
551 * without --bare. Catch the error early.
552 */
553 git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
554 work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
555 if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
556 die(_("%s (or --work-tree=<directory>) not allowed without "
557 "specifying %s (or --git-dir=<directory>)"),
558 GIT_WORK_TREE_ENVIRONMENT,
559 GIT_DIR_ENVIRONMENT);
560
561 /*
562 * Set up the default .git directory contents
563 */
564 if (!git_dir)
565 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
566
567 if (is_bare_repository_cfg < 0)
568 is_bare_repository_cfg = guess_repository_type(git_dir);
569
570 if (!is_bare_repository_cfg) {
571 const char *git_dir_parent = strrchr(git_dir, '/');
572 if (git_dir_parent) {
573 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
574 git_work_tree_cfg = real_pathdup(rel, 1);
575 free(rel);
576 }
577 if (!git_work_tree_cfg)
578 git_work_tree_cfg = xgetcwd();
579 if (work_tree)
580 set_git_work_tree(work_tree);
581 else
582 set_git_work_tree(git_work_tree_cfg);
583 if (access(get_git_work_tree(), X_OK))
584 die_errno (_("Cannot access work tree '%s'"),
585 get_git_work_tree());
586 }
587 else {
588 if (work_tree)
589 set_git_work_tree(work_tree);
590 }
591
592 UNLEAK(real_git_dir);
593 UNLEAK(git_dir);
594 UNLEAK(work_tree);
595
596 flags |= INIT_DB_EXIST_OK;
597 return init_db(git_dir, real_git_dir, template_dir, flags);
598 }