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
22static int init_is_bare_repository = 0;
23static int init_shared_repository = -1;
24static const char *init_db_template_dir;
25static const char *git_link;
26
27static 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
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, template_baselen);
48
49 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
60 if (lstat(template->buf, &st_template))
61 die_errno(_("cannot stat template '%s'"), template->buf);
62
63 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}
92
93static 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
103 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
114 strbuf_addstr(&template_path, template_dir);
115 strbuf_complete(&template_path, '/');
116 template_len = template_path.len;
117
118 dir = opendir(template_path.buf);
119 if (!dir) {
120 warning(_("templates not found %s"), template_dir);
121 goto free_return;
122 }
123
124 /* 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
129 /*
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
141 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}
151
152static 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
157 return 0;
158}
159
160/*
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}
173
174static 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
184 /*
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
191 /* Just look for `init.templatedir` */
192 git_config(git_init_db_config, NULL);
193
194 /* First copy the templates -- we might have the default
195 * config file there, in which case we would want to read
196 * from it after installing.
197 */
198 copy_templates(template_path);
199
200 git_config(git_default_config, NULL);
201 is_bare_repository_cfg = init_is_bare_repository;
202
203 /* reading existing config may have overwrote it */
204 if (init_shared_repository != -1)
205 set_shared_repository(init_shared_repository);
206
207 /*
208 * We would have created the above under user's umask -- under
209 * shared-repository settings, we would need to fix them up.
210 */
211 if (get_shared_repository()) {
212 adjust_shared_perm(get_git_dir());
213 adjust_shared_perm(git_path_buf(&buf, "refs"));
214 adjust_shared_perm(git_path_buf(&buf, "refs/heads"));
215 adjust_shared_perm(git_path_buf(&buf, "refs/tags"));
216 }
217
218 /*
219 * Create the default symlink from ".git/HEAD" to the "master"
220 * branch, if it does not exist yet.
221 */
222 path = git_path_buf(&buf, "HEAD");
223 reinit = (!access(path, R_OK)
224 || readlink(path, junk, sizeof(junk)-1) != -1);
225 if (!reinit) {
226 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
227 exit(1);
228 }
229
230 /* This forces creation of new config file */
231 xsnprintf(repo_version_string, sizeof(repo_version_string),
232 "%d", GIT_REPO_VERSION);
233 git_config_set("core.repositoryformatversion", repo_version_string);
234
235 /* Check filemode trustability */
236 path = git_path_buf(&buf, "config");
237 filemode = TEST_FILEMODE;
238 if (TEST_FILEMODE && !lstat(path, &st1)) {
239 struct stat st2;
240 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
241 !lstat(path, &st2) &&
242 st1.st_mode != st2.st_mode &&
243 !chmod(path, st1.st_mode));
244 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
245 filemode = 0;
246 }
247 git_config_set("core.filemode", filemode ? "true" : "false");
248
249 if (is_bare_repository())
250 git_config_set("core.bare", "true");
251 else {
252 const char *work_tree = get_git_work_tree();
253 git_config_set("core.bare", "false");
254 /* allow template config file to override the default */
255 if (log_all_ref_updates == -1)
256 git_config_set("core.logallrefupdates", "true");
257 if (needs_work_tree_config(get_git_dir(), work_tree))
258 git_config_set("core.worktree", work_tree);
259 }
260
261 if (!reinit) {
262 /* Check if symlink is supported in the work tree */
263 path = git_path_buf(&buf, "tXXXXXX");
264 if (!close(xmkstemp(path)) &&
265 !unlink(path) &&
266 !symlink("testing", path) &&
267 !lstat(path, &st1) &&
268 S_ISLNK(st1.st_mode))
269 unlink(path); /* good */
270 else
271 git_config_set("core.symlinks", "false");
272
273 /* Check if the filesystem is case-insensitive */
274 path = git_path_buf(&buf, "CoNfIg");
275 if (!access(path, F_OK))
276 git_config_set("core.ignorecase", "true");
277 probe_utf8_pathname_composition();
278 }
279
280 strbuf_release(&buf);
281 return reinit;
282}
283
284static void create_object_directory(void)
285{
286 struct strbuf path = STRBUF_INIT;
287 size_t baselen;
288
289 strbuf_addstr(&path, get_object_directory());
290 baselen = path.len;
291
292 safe_create_dir(path.buf, 1);
293
294 strbuf_setlen(&path, baselen);
295 strbuf_addstr(&path, "/pack");
296 safe_create_dir(path.buf, 1);
297
298 strbuf_setlen(&path, baselen);
299 strbuf_addstr(&path, "/info");
300 safe_create_dir(path.buf, 1);
301
302 strbuf_release(&path);
303}
304
305int set_git_dir_init(const char *git_dir, const char *real_git_dir,
306 int exist_ok)
307{
308 if (real_git_dir) {
309 struct stat st;
310
311 if (!exist_ok && !stat(git_dir, &st))
312 die(_("%s already exists"), git_dir);
313
314 if (!exist_ok && !stat(real_git_dir, &st))
315 die(_("%s already exists"), real_git_dir);
316
317 /*
318 * make sure symlinks are resolved because we'll be
319 * moving the target repo later on in separate_git_dir()
320 */
321 git_link = xstrdup(real_path(git_dir));
322 set_git_dir(real_path(real_git_dir));
323 }
324 else {
325 set_git_dir(real_path(git_dir));
326 git_link = NULL;
327 }
328 return 0;
329}
330
331static void separate_git_dir(const char *git_dir)
332{
333 struct stat st;
334
335 if (!stat(git_link, &st)) {
336 const char *src;
337
338 if (S_ISREG(st.st_mode))
339 src = read_gitfile(git_link);
340 else if (S_ISDIR(st.st_mode))
341 src = git_link;
342 else
343 die(_("unable to handle file type %d"), (int)st.st_mode);
344
345 if (rename(src, git_dir))
346 die_errno(_("unable to move %s to %s"), src, git_dir);
347 }
348
349 write_file(git_link, "gitdir: %s", git_dir);
350}
351
352int init_db(const char *template_dir, unsigned int flags)
353{
354 int reinit;
355 const char *git_dir = get_git_dir();
356
357 if (git_link)
358 separate_git_dir(git_dir);
359
360 safe_create_dir(git_dir, 0);
361
362 init_is_bare_repository = is_bare_repository();
363
364 /* Check to see if the repository version is right.
365 * Note that a newly created repository does not have
366 * config file, so this will not fail. What we are catching
367 * is an attempt to reinitialize new repository with an old tool.
368 */
369 check_repository_format();
370
371 reinit = create_default_files(template_dir);
372
373 create_object_directory();
374
375 if (get_shared_repository()) {
376 char buf[10];
377 /* We do not spell "group" and such, so that
378 * the configuration can be read by older version
379 * of git. Note, we use octal numbers for new share modes,
380 * and compatibility values for PERM_GROUP and
381 * PERM_EVERYBODY.
382 */
383 if (get_shared_repository() < 0)
384 /* force to the mode value */
385 xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
386 else if (get_shared_repository() == PERM_GROUP)
387 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
388 else if (get_shared_repository() == PERM_EVERYBODY)
389 xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
390 else
391 die("BUG: invalid value for shared_repository");
392 git_config_set("core.sharedrepository", buf);
393 git_config_set("receive.denyNonFastforwards", "true");
394 }
395
396 if (!(flags & INIT_DB_QUIET)) {
397 int len = strlen(git_dir);
398
399 /* TRANSLATORS: The first '%s' is either "Reinitialized
400 existing" or "Initialized empty", the second " shared" or
401 "", and the last '%s%s' is the verbatim directory name. */
402 printf(_("%s%s Git repository in %s%s\n"),
403 reinit ? _("Reinitialized existing") : _("Initialized empty"),
404 get_shared_repository() ? _(" shared") : "",
405 git_dir, len && git_dir[len-1] != '/' ? "/" : "");
406 }
407
408 return 0;
409}
410
411static int guess_repository_type(const char *git_dir)
412{
413 const char *slash;
414 char *cwd;
415 int cwd_is_git_dir;
416
417 /*
418 * "GIT_DIR=. git init" is always bare.
419 * "GIT_DIR=`pwd` git init" too.
420 */
421 if (!strcmp(".", git_dir))
422 return 1;
423 cwd = xgetcwd();
424 cwd_is_git_dir = !strcmp(git_dir, cwd);
425 free(cwd);
426 if (cwd_is_git_dir)
427 return 1;
428 /*
429 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
430 */
431 if (!strcmp(git_dir, ".git"))
432 return 0;
433 slash = strrchr(git_dir, '/');
434 if (slash && !strcmp(slash, "/.git"))
435 return 0;
436
437 /*
438 * Otherwise it is often bare. At this point
439 * we are just guessing.
440 */
441 return 1;
442}
443
444static int shared_callback(const struct option *opt, const char *arg, int unset)
445{
446 *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
447 return 0;
448}
449
450static const char *const init_db_usage[] = {
451 N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
452 NULL
453};
454
455/*
456 * If you want to, you can share the DB area with any number of branches.
457 * That has advantages: you can save space by sharing all the SHA1 objects.
458 * On the other hand, it might just make lookup slower and messier. You
459 * be the judge. The default case is to have one DB per managed directory.
460 */
461int cmd_init_db(int argc, const char **argv, const char *prefix)
462{
463 const char *git_dir;
464 const char *real_git_dir = NULL;
465 const char *work_tree;
466 const char *template_dir = NULL;
467 unsigned int flags = 0;
468 const struct option init_db_options[] = {
469 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
470 N_("directory from which templates will be used")),
471 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
472 N_("create a bare repository"), 1),
473 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
474 N_("permissions"),
475 N_("specify that the git repository is to be shared amongst several users"),
476 PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
477 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
478 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
479 N_("separate git dir from working tree")),
480 OPT_END()
481 };
482
483 argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
484
485 if (real_git_dir && !is_absolute_path(real_git_dir))
486 real_git_dir = xstrdup(real_path(real_git_dir));
487
488 if (argc == 1) {
489 int mkdir_tried = 0;
490 retry:
491 if (chdir(argv[0]) < 0) {
492 if (!mkdir_tried) {
493 int saved;
494 /*
495 * At this point we haven't read any configuration,
496 * and we know shared_repository should always be 0;
497 * but just in case we play safe.
498 */
499 saved = get_shared_repository();
500 set_shared_repository(0);
501 switch (safe_create_leading_directories_const(argv[0])) {
502 case SCLD_OK:
503 case SCLD_PERMS:
504 break;
505 case SCLD_EXISTS:
506 errno = EEXIST;
507 /* fallthru */
508 default:
509 die_errno(_("cannot mkdir %s"), argv[0]);
510 break;
511 }
512 set_shared_repository(saved);
513 if (mkdir(argv[0], 0777) < 0)
514 die_errno(_("cannot mkdir %s"), argv[0]);
515 mkdir_tried = 1;
516 goto retry;
517 }
518 die_errno(_("cannot chdir to %s"), argv[0]);
519 }
520 } else if (0 < argc) {
521 usage(init_db_usage[0]);
522 }
523 if (is_bare_repository_cfg == 1) {
524 char *cwd = xgetcwd();
525 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
526 free(cwd);
527 }
528
529 if (init_shared_repository != -1)
530 set_shared_repository(init_shared_repository);
531
532 /*
533 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
534 * without --bare. Catch the error early.
535 */
536 git_dir = getenv(GIT_DIR_ENVIRONMENT);
537 work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
538 if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
539 die(_("%s (or --work-tree=<directory>) not allowed without "
540 "specifying %s (or --git-dir=<directory>)"),
541 GIT_WORK_TREE_ENVIRONMENT,
542 GIT_DIR_ENVIRONMENT);
543
544 /*
545 * Set up the default .git directory contents
546 */
547 if (!git_dir)
548 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
549
550 if (is_bare_repository_cfg < 0)
551 is_bare_repository_cfg = guess_repository_type(git_dir);
552
553 if (!is_bare_repository_cfg) {
554 const char *git_dir_parent = strrchr(git_dir, '/');
555 if (git_dir_parent) {
556 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
557 git_work_tree_cfg = xstrdup(real_path(rel));
558 free(rel);
559 }
560 if (!git_work_tree_cfg)
561 git_work_tree_cfg = xgetcwd();
562 if (work_tree)
563 set_git_work_tree(work_tree);
564 else
565 set_git_work_tree(git_work_tree_cfg);
566 if (access(get_git_work_tree(), X_OK))
567 die_errno (_("Cannot access work tree '%s'"),
568 get_git_work_tree());
569 }
570 else {
571 if (work_tree)
572 set_git_work_tree(work_tree);
573 }
574
575 set_git_dir_init(git_dir, real_git_dir, 1);
576
577 return init_db(template_dir, flags);
578}