]> git.ipfire.org Git - thirdparty/git.git/blob - builtin/init-db.c
Merge branch 'bc/sha-256-part-3'
[thirdparty/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 #define GIT_DEFAULT_HASH_ENVIRONMENT "GIT_DEFAULT_HASH"
24
25 static int init_is_bare_repository = 0;
26 static int init_shared_repository = -1;
27 static const char *init_db_template_dir;
28
29 static void copy_templates_1(struct strbuf *path, struct strbuf *template_path,
30 DIR *dir)
31 {
32 size_t path_baselen = path->len;
33 size_t template_baselen = template_path->len;
34 struct dirent *de;
35
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.
42 */
43 safe_create_dir(path->buf, 1);
44 while ((de = readdir(dir)) != NULL) {
45 struct stat st_git, st_template;
46 int exists = 0;
47
48 strbuf_setlen(path, path_baselen);
49 strbuf_setlen(template_path, template_baselen);
50
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);
58 }
59 else
60 exists = 1;
61
62 if (lstat(template_path->buf, &st_template))
63 die_errno(_("cannot stat template '%s'"), template_path->buf);
64
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);
73 }
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);
85 }
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);
90 }
91 else
92 error(_("ignoring template %s"), template_path->buf);
93 }
94 }
95
96 static void copy_templates(const char *template_dir)
97 {
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;
105
106 if (!template_dir)
107 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
108 if (!template_dir)
109 template_dir = init_db_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;
115 }
116
117 strbuf_addstr(&template_path, template_dir);
118 strbuf_complete(&template_path, '/');
119 template_len = template_path.len;
120
121 dir = opendir(template_path.buf);
122 if (!dir) {
123 warning(_("templates not found in %s"), template_dir);
124 goto free_return;
125 }
126
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);
131
132 /*
133 * No mention of version at all is OK, but anything else should be
134 * verified.
135 */
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;
142 }
143
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);
154 }
155
156 static int git_init_db_config(const char *k, const char *v, void *cb)
157 {
158 if (!strcmp(k, "init.templatedir"))
159 return git_config_pathname(&init_db_template_dir, k, v);
160
161 if (starts_with(k, "core."))
162 return platform_core_config(k, v, cb);
163
164 return 0;
165 }
166
167 /*
168 * If the git_dir is not directly inside the working tree, then git will not
169 * find it by default, and we need to set the worktree explicitly.
170 */
171 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
172 {
173 if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
174 return 0;
175 if (skip_prefix(git_dir, work_tree, &git_dir) &&
176 !strcmp(git_dir, "/.git"))
177 return 0;
178 return 1;
179 }
180
181 void initialize_repository_version(int hash_algo)
182 {
183 char repo_version_string[10];
184 int repo_version = GIT_REPO_VERSION;
185
186 if (hash_algo != GIT_HASH_SHA1)
187 repo_version = GIT_REPO_VERSION_READ;
188
189 /* This forces creation of new config file */
190 xsnprintf(repo_version_string, sizeof(repo_version_string),
191 "%d", repo_version);
192 git_config_set("core.repositoryformatversion", repo_version_string);
193
194 if (hash_algo != GIT_HASH_SHA1)
195 git_config_set("extensions.objectformat",
196 hash_algos[hash_algo].name);
197 }
198
199 static int create_default_files(const char *template_path,
200 const char *original_git_dir,
201 const char *initial_branch,
202 const struct repository_format *fmt)
203 {
204 struct stat st1;
205 struct strbuf buf = STRBUF_INIT;
206 char *path;
207 char junk[2];
208 int reinit;
209 int filemode;
210 struct strbuf err = STRBUF_INIT;
211
212 /* Just look for `init.templatedir` */
213 init_db_template_dir = NULL; /* re-set in case it was set before */
214 git_config(git_init_db_config, NULL);
215
216 /*
217 * First copy the templates -- we might have the default
218 * config file there, in which case we would want to read
219 * from it after installing.
220 *
221 * Before reading that config, we also need to clear out any cached
222 * values (since we've just potentially changed what's available on
223 * disk).
224 */
225 copy_templates(template_path);
226 git_config_clear();
227 reset_shared_repository();
228 git_config(git_default_config, NULL);
229
230 /*
231 * We must make sure command-line options continue to override any
232 * values we might have just re-read from the config.
233 */
234 is_bare_repository_cfg = init_is_bare_repository;
235 if (init_shared_repository != -1)
236 set_shared_repository(init_shared_repository);
237
238 /*
239 * We would have created the above under user's umask -- under
240 * shared-repository settings, we would need to fix them up.
241 */
242 if (get_shared_repository()) {
243 adjust_shared_perm(get_git_dir());
244 }
245
246 /*
247 * We need to create a "refs" dir in any case so that older
248 * versions of git can tell that this is a repository.
249 */
250 safe_create_dir(git_path("refs"), 1);
251 adjust_shared_perm(git_path("refs"));
252
253 if (refs_init_db(&err))
254 die("failed to set up refs db: %s", err.buf);
255
256 /*
257 * Point the HEAD symref to the initial branch with if HEAD does
258 * not yet exist.
259 */
260 path = git_path_buf(&buf, "HEAD");
261 reinit = (!access(path, R_OK)
262 || readlink(path, junk, sizeof(junk)-1) != -1);
263 if (!reinit) {
264 char *ref;
265
266 if (!initial_branch)
267 initial_branch = git_default_branch_name();
268
269 ref = xstrfmt("refs/heads/%s", initial_branch);
270 if (check_refname_format(ref, 0) < 0)
271 die(_("invalid initial branch name: '%s'"),
272 initial_branch);
273
274 if (create_symref("HEAD", ref, NULL) < 0)
275 exit(1);
276 free(ref);
277 }
278
279 initialize_repository_version(fmt->hash_algo);
280
281 /* Check filemode trustability */
282 path = git_path_buf(&buf, "config");
283 filemode = TEST_FILEMODE;
284 if (TEST_FILEMODE && !lstat(path, &st1)) {
285 struct stat st2;
286 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
287 !lstat(path, &st2) &&
288 st1.st_mode != st2.st_mode &&
289 !chmod(path, st1.st_mode));
290 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
291 filemode = 0;
292 }
293 git_config_set("core.filemode", filemode ? "true" : "false");
294
295 if (is_bare_repository())
296 git_config_set("core.bare", "true");
297 else {
298 const char *work_tree = get_git_work_tree();
299 git_config_set("core.bare", "false");
300 /* allow template config file to override the default */
301 if (log_all_ref_updates == LOG_REFS_UNSET)
302 git_config_set("core.logallrefupdates", "true");
303 if (needs_work_tree_config(original_git_dir, work_tree))
304 git_config_set("core.worktree", work_tree);
305 }
306
307 if (!reinit) {
308 /* Check if symlink is supported in the work tree */
309 path = git_path_buf(&buf, "tXXXXXX");
310 if (!close(xmkstemp(path)) &&
311 !unlink(path) &&
312 !symlink("testing", path) &&
313 !lstat(path, &st1) &&
314 S_ISLNK(st1.st_mode))
315 unlink(path); /* good */
316 else
317 git_config_set("core.symlinks", "false");
318
319 /* Check if the filesystem is case-insensitive */
320 path = git_path_buf(&buf, "CoNfIg");
321 if (!access(path, F_OK))
322 git_config_set("core.ignorecase", "true");
323 probe_utf8_pathname_composition();
324 }
325
326 strbuf_release(&buf);
327 return reinit;
328 }
329
330 static void create_object_directory(void)
331 {
332 struct strbuf path = STRBUF_INIT;
333 size_t baselen;
334
335 strbuf_addstr(&path, get_object_directory());
336 baselen = path.len;
337
338 safe_create_dir(path.buf, 1);
339
340 strbuf_setlen(&path, baselen);
341 strbuf_addstr(&path, "/pack");
342 safe_create_dir(path.buf, 1);
343
344 strbuf_setlen(&path, baselen);
345 strbuf_addstr(&path, "/info");
346 safe_create_dir(path.buf, 1);
347
348 strbuf_release(&path);
349 }
350
351 static void separate_git_dir(const char *git_dir, const char *git_link)
352 {
353 struct stat st;
354
355 if (!stat(git_link, &st)) {
356 const char *src;
357
358 if (S_ISREG(st.st_mode))
359 src = read_gitfile(git_link);
360 else if (S_ISDIR(st.st_mode))
361 src = git_link;
362 else
363 die(_("unable to handle file type %d"), (int)st.st_mode);
364
365 if (rename(src, git_dir))
366 die_errno(_("unable to move %s to %s"), src, git_dir);
367 }
368
369 write_file(git_link, "gitdir: %s", git_dir);
370 }
371
372 static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash)
373 {
374 const char *env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT);
375 /*
376 * If we already have an initialized repo, don't allow the user to
377 * specify a different algorithm, as that could cause corruption.
378 * Otherwise, if the user has specified one on the command line, use it.
379 */
380 if (repo_fmt->version >= 0 && hash != GIT_HASH_UNKNOWN && hash != repo_fmt->hash_algo)
381 die(_("attempt to reinitialize repository with different hash"));
382 else if (hash != GIT_HASH_UNKNOWN)
383 repo_fmt->hash_algo = hash;
384 else if (env) {
385 int env_algo = hash_algo_by_name(env);
386 if (env_algo == GIT_HASH_UNKNOWN)
387 die(_("unknown hash algorithm '%s'"), env);
388 repo_fmt->hash_algo = env_algo;
389 }
390 }
391
392 int init_db(const char *git_dir, const char *real_git_dir,
393 const char *template_dir, int hash, const char *initial_branch,
394 unsigned int flags)
395 {
396 int reinit;
397 int exist_ok = flags & INIT_DB_EXIST_OK;
398 char *original_git_dir = real_pathdup(git_dir, 1);
399 struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT;
400
401 if (real_git_dir) {
402 struct stat st;
403
404 if (!exist_ok && !stat(git_dir, &st))
405 die(_("%s already exists"), git_dir);
406
407 if (!exist_ok && !stat(real_git_dir, &st))
408 die(_("%s already exists"), real_git_dir);
409
410 set_git_dir(real_git_dir, 1);
411 git_dir = get_git_dir();
412 separate_git_dir(git_dir, original_git_dir);
413 }
414 else {
415 set_git_dir(git_dir, 1);
416 git_dir = get_git_dir();
417 }
418 startup_info->have_repository = 1;
419
420 /* Just look for `core.hidedotfiles` */
421 git_config(git_init_db_config, NULL);
422
423 safe_create_dir(git_dir, 0);
424
425 init_is_bare_repository = is_bare_repository();
426
427 /* Check to see if the repository version is right.
428 * Note that a newly created repository does not have
429 * config file, so this will not fail. What we are catching
430 * is an attempt to reinitialize new repository with an old tool.
431 */
432 check_repository_format(&repo_fmt);
433
434 validate_hash_algorithm(&repo_fmt, hash);
435
436 reinit = create_default_files(template_dir, original_git_dir,
437 initial_branch, &repo_fmt);
438 if (reinit && initial_branch)
439 warning(_("re-init: ignored --initial-branch=%s"),
440 initial_branch);
441
442 create_object_directory();
443
444 if (get_shared_repository()) {
445 char buf[10];
446 /* We do not spell "group" and such, so that
447 * the configuration can be read by older version
448 * of git. Note, we use octal numbers for new share modes,
449 * and compatibility values for PERM_GROUP and
450 * PERM_EVERYBODY.
451 */
452 if (get_shared_repository() < 0)
453 /* force to the mode value */
454 xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
455 else if (get_shared_repository() == PERM_GROUP)
456 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
457 else if (get_shared_repository() == PERM_EVERYBODY)
458 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
459 else
460 BUG("invalid value for shared_repository");
461 git_config_set("core.sharedrepository", buf);
462 git_config_set("receive.denyNonFastforwards", "true");
463 }
464
465 if (!(flags & INIT_DB_QUIET)) {
466 int len = strlen(git_dir);
467
468 if (reinit)
469 printf(get_shared_repository()
470 ? _("Reinitialized existing shared Git repository in %s%s\n")
471 : _("Reinitialized existing Git repository in %s%s\n"),
472 git_dir, len && git_dir[len-1] != '/' ? "/" : "");
473 else
474 printf(get_shared_repository()
475 ? _("Initialized empty shared Git repository in %s%s\n")
476 : _("Initialized empty Git repository in %s%s\n"),
477 git_dir, len && git_dir[len-1] != '/' ? "/" : "");
478 }
479
480 free(original_git_dir);
481 return 0;
482 }
483
484 static int guess_repository_type(const char *git_dir)
485 {
486 const char *slash;
487 char *cwd;
488 int cwd_is_git_dir;
489
490 /*
491 * "GIT_DIR=. git init" is always bare.
492 * "GIT_DIR=`pwd` git init" too.
493 */
494 if (!strcmp(".", git_dir))
495 return 1;
496 cwd = xgetcwd();
497 cwd_is_git_dir = !strcmp(git_dir, cwd);
498 free(cwd);
499 if (cwd_is_git_dir)
500 return 1;
501 /*
502 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
503 */
504 if (!strcmp(git_dir, ".git"))
505 return 0;
506 slash = strrchr(git_dir, '/');
507 if (slash && !strcmp(slash, "/.git"))
508 return 0;
509
510 /*
511 * Otherwise it is often bare. At this point
512 * we are just guessing.
513 */
514 return 1;
515 }
516
517 static int shared_callback(const struct option *opt, const char *arg, int unset)
518 {
519 BUG_ON_OPT_NEG(unset);
520 *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
521 return 0;
522 }
523
524 static const char *const init_db_usage[] = {
525 N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
526 NULL
527 };
528
529 /*
530 * If you want to, you can share the DB area with any number of branches.
531 * That has advantages: you can save space by sharing all the SHA1 objects.
532 * On the other hand, it might just make lookup slower and messier. You
533 * be the judge. The default case is to have one DB per managed directory.
534 */
535 int cmd_init_db(int argc, const char **argv, const char *prefix)
536 {
537 const char *git_dir;
538 const char *real_git_dir = NULL;
539 const char *work_tree;
540 const char *template_dir = NULL;
541 unsigned int flags = 0;
542 const char *object_format = NULL;
543 const char *initial_branch = NULL;
544 int hash_algo = GIT_HASH_UNKNOWN;
545 const struct option init_db_options[] = {
546 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
547 N_("directory from which templates will be used")),
548 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
549 N_("create a bare repository"), 1),
550 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
551 N_("permissions"),
552 N_("specify that the git repository is to be shared amongst several users"),
553 PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
554 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
555 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
556 N_("separate git dir from working tree")),
557 OPT_STRING('b', "initial-branch", &initial_branch, N_("name"),
558 N_("override the name of the initial branch")),
559 OPT_STRING(0, "object-format", &object_format, N_("hash"),
560 N_("specify the hash algorithm to use")),
561 OPT_END()
562 };
563
564 argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
565
566 if (real_git_dir && !is_absolute_path(real_git_dir))
567 real_git_dir = real_pathdup(real_git_dir, 1);
568
569 if (template_dir && *template_dir && !is_absolute_path(template_dir))
570 template_dir = absolute_pathdup(template_dir);
571
572 if (argc == 1) {
573 int mkdir_tried = 0;
574 retry:
575 if (chdir(argv[0]) < 0) {
576 if (!mkdir_tried) {
577 int saved;
578 /*
579 * At this point we haven't read any configuration,
580 * and we know shared_repository should always be 0;
581 * but just in case we play safe.
582 */
583 saved = get_shared_repository();
584 set_shared_repository(0);
585 switch (safe_create_leading_directories_const(argv[0])) {
586 case SCLD_OK:
587 case SCLD_PERMS:
588 break;
589 case SCLD_EXISTS:
590 errno = EEXIST;
591 /* fallthru */
592 default:
593 die_errno(_("cannot mkdir %s"), argv[0]);
594 break;
595 }
596 set_shared_repository(saved);
597 if (mkdir(argv[0], 0777) < 0)
598 die_errno(_("cannot mkdir %s"), argv[0]);
599 mkdir_tried = 1;
600 goto retry;
601 }
602 die_errno(_("cannot chdir to %s"), argv[0]);
603 }
604 } else if (0 < argc) {
605 usage(init_db_usage[0]);
606 }
607 if (is_bare_repository_cfg == 1) {
608 char *cwd = xgetcwd();
609 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
610 free(cwd);
611 }
612
613 if (object_format) {
614 hash_algo = hash_algo_by_name(object_format);
615 if (hash_algo == GIT_HASH_UNKNOWN)
616 die(_("unknown hash algorithm '%s'"), object_format);
617 }
618
619 if (init_shared_repository != -1)
620 set_shared_repository(init_shared_repository);
621
622 /*
623 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
624 * without --bare. Catch the error early.
625 */
626 git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
627 work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
628 if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
629 die(_("%s (or --work-tree=<directory>) not allowed without "
630 "specifying %s (or --git-dir=<directory>)"),
631 GIT_WORK_TREE_ENVIRONMENT,
632 GIT_DIR_ENVIRONMENT);
633
634 /*
635 * Set up the default .git directory contents
636 */
637 if (!git_dir)
638 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
639
640 if (is_bare_repository_cfg < 0)
641 is_bare_repository_cfg = guess_repository_type(git_dir);
642
643 if (!is_bare_repository_cfg) {
644 const char *git_dir_parent = strrchr(git_dir, '/');
645 if (git_dir_parent) {
646 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
647 git_work_tree_cfg = real_pathdup(rel, 1);
648 free(rel);
649 }
650 if (!git_work_tree_cfg)
651 git_work_tree_cfg = xgetcwd();
652 if (work_tree)
653 set_git_work_tree(work_tree);
654 else
655 set_git_work_tree(git_work_tree_cfg);
656 if (access(get_git_work_tree(), X_OK))
657 die_errno (_("Cannot access work tree '%s'"),
658 get_git_work_tree());
659 }
660 else {
661 if (work_tree)
662 set_git_work_tree(work_tree);
663 }
664
665 UNLEAK(real_git_dir);
666 UNLEAK(git_dir);
667 UNLEAK(work_tree);
668
669 flags |= INIT_DB_EXIST_OK;
670 return init_db(git_dir, real_git_dir, template_dir, hash_algo,
671 initial_branch, flags);
672 }