1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6#include "cache.h"
7#include "builtin.h"
8#include "exec_cmd.h"
9#include "parse-options.h"
10#ifndef DEFAULT_GIT_TEMPLATE_DIR
12#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
13#endif
14#ifdef NO_TRUSTABLE_FILEMODE
16#define TEST_FILEMODE 0
17#else
18#define TEST_FILEMODE 1
19#endif
20static int init_is_bare_repository = 0;
22static int init_shared_repository = -1;
23static const char *init_db_template_dir;
24static const char *git_link;
25static void safe_create_dir(const char *dir, int share)
27{
28 if (mkdir(dir, 0777) < 0) {
29 if (errno != EEXIST) {
30 perror(dir);
31 exit(1);
32 }
33 }
34 else if (share && adjust_shared_perm(dir))
35 die(_("Could not make %s writable by group"), dir);
36}
37static void copy_templates_1(char *path, int baselen,
39 char *template, int template_baselen,
40 DIR *dir)
41{
42 struct dirent *de;
43 /* Note: if ".git/hooks" file exists in the repository being
45 * re-initialized, /etc/core-git/templates/hooks/update would
46 * cause "git init" to fail here. I think this is sane but
47 * it means that the set of templates we ship by default, along
48 * with the way the namespace under .git/ is organized, should
49 * be really carefully chosen.
50 */
51 safe_create_dir(path, 1);
52 while ((de = readdir(dir)) != NULL) {
53 struct stat st_git, st_template;
54 int namelen;
55 int exists = 0;
56 if (de->d_name[0] == '.')
58 continue;
59 namelen = strlen(de->d_name);
60 if ((PATH_MAX <= baselen + namelen) ||
61 (PATH_MAX <= template_baselen + namelen))
62 die(_("insanely long template name %s"), de->d_name);
63 memcpy(path + baselen, de->d_name, namelen+1);
64 memcpy(template + template_baselen, de->d_name, namelen+1);
65 if (lstat(path, &st_git)) {
66 if (errno != ENOENT)
67 die_errno(_("cannot stat '%s'"), path);
68 }
69 else
70 exists = 1;
71 if (lstat(template, &st_template))
73 die_errno(_("cannot stat template '%s'"), template);
74 if (S_ISDIR(st_template.st_mode)) {
76 DIR *subdir = opendir(template);
77 int baselen_sub = baselen + namelen;
78 int template_baselen_sub = template_baselen + namelen;
79 if (!subdir)
80 die_errno(_("cannot opendir '%s'"), template);
81 path[baselen_sub++] =
82 template[template_baselen_sub++] = '/';
83 path[baselen_sub] =
84 template[template_baselen_sub] = 0;
85 copy_templates_1(path, baselen_sub,
86 template, template_baselen_sub,
87 subdir);
88 closedir(subdir);
89 }
90 else if (exists)
91 continue;
92 else if (S_ISLNK(st_template.st_mode)) {
93 char lnk[256];
94 int len;
95 len = readlink(template, lnk, sizeof(lnk));
96 if (len < 0)
97 die_errno(_("cannot readlink '%s'"), template);
98 if (sizeof(lnk) <= len)
99 die(_("insanely long symlink %s"), template);
100 lnk[len] = 0;
101 if (symlink(lnk, path))
102 die_errno(_("cannot symlink '%s' '%s'"), lnk, path);
103 }
104 else if (S_ISREG(st_template.st_mode)) {
105 if (copy_file(path, template, st_template.st_mode))
106 die_errno(_("cannot copy '%s' to '%s'"), template,
107 path);
108 }
109 else
110 error(_("ignoring template %s"), template);
111 }
112}
113static void copy_templates(const char *template_dir)
115{
116 char path[PATH_MAX];
117 char template_path[PATH_MAX];
118 int template_len;
119 DIR *dir;
120 const char *git_dir = get_git_dir();
121 int len = strlen(git_dir);
122 if (!template_dir)
124 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
125 if (!template_dir)
126 template_dir = init_db_template_dir;
127 if (!template_dir)
128 template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
129 if (!template_dir[0])
130 return;
131 template_len = strlen(template_dir);
132 if (PATH_MAX <= (template_len+strlen("/config")))
133 die(_("insanely long template path %s"), template_dir);
134 strcpy(template_path, template_dir);
135 if (template_path[template_len-1] != '/') {
136 template_path[template_len++] = '/';
137 template_path[template_len] = 0;
138 }
139 dir = opendir(template_path);
140 if (!dir) {
141 warning(_("templates not found %s"), template_dir);
142 return;
143 }
144 /* Make sure that template is from the correct vintage */
146 strcpy(template_path + template_len, "config");
147 repository_format_version = 0;
148 git_config_from_file(check_repository_format_version,
149 template_path, NULL);
150 template_path[template_len] = 0;
151 if (repository_format_version &&
153 repository_format_version != GIT_REPO_VERSION) {
154 warning(_("not copying templates of "
155 "a wrong format version %d from '%s'"),
156 repository_format_version,
157 template_dir);
158 closedir(dir);
159 return;
160 }
161 memcpy(path, git_dir, len);
163 if (len && path[len - 1] != '/')
164 path[len++] = '/';
165 path[len] = 0;
166 copy_templates_1(path, len,
167 template_path, template_len,
168 dir);
169 closedir(dir);
170}
171static int git_init_db_config(const char *k, const char *v, void *cb)
173{
174 if (!strcmp(k, "init.templatedir"))
175 return git_config_pathname(&init_db_template_dir, k, v);
176 return 0;
178}
179/*
181 * If the git_dir is not directly inside the working tree, then git will not
182 * find it by default, and we need to set the worktree explicitly.
183 */
184static int needs_work_tree_config(const char *git_dir, const char *work_tree)
185{
186 if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
187 return 0;
188 if (skip_prefix(git_dir, work_tree, &git_dir) &&
189 !strcmp(git_dir, "/.git"))
190 return 0;
191 return 1;
192}
193static int create_default_files(const char *template_path)
195{
196 const char *git_dir = get_git_dir();
197 unsigned len = strlen(git_dir);
198 static char path[PATH_MAX];
199 struct stat st1;
200 char repo_version_string[10];
201 char junk[2];
202 int reinit;
203 int filemode;
204 if (len > sizeof(path)-50)
206 die(_("insane git directory %s"), git_dir);
207 memcpy(path, git_dir, len);
208 if (len && path[len-1] != '/')
210 path[len++] = '/';
211 /*
213 * Create .git/refs/{heads,tags}
214 */
215 safe_create_dir(git_path("refs"), 1);
216 safe_create_dir(git_path("refs/heads"), 1);
217 safe_create_dir(git_path("refs/tags"), 1);
218 /* Just look for `init.templatedir` */
220 git_config(git_init_db_config, NULL);
221 /* First copy the templates -- we might have the default
223 * config file there, in which case we would want to read
224 * from it after installing.
225 */
226 copy_templates(template_path);
227 git_config(git_default_config, NULL);
229 is_bare_repository_cfg = init_is_bare_repository;
230 /* reading existing config may have overwrote it */
232 if (init_shared_repository != -1)
233 shared_repository = init_shared_repository;
234 /*
236 * We would have created the above under user's umask -- under
237 * shared-repository settings, we would need to fix them up.
238 */
239 if (shared_repository) {
240 adjust_shared_perm(get_git_dir());
241 adjust_shared_perm(git_path("refs"));
242 adjust_shared_perm(git_path("refs/heads"));
243 adjust_shared_perm(git_path("refs/tags"));
244 }
245 /*
247 * Create the default symlink from ".git/HEAD" to the "master"
248 * branch, if it does not exist yet.
249 */
250 strcpy(path + len, "HEAD");
251 reinit = (!access(path, R_OK)
252 || readlink(path, junk, sizeof(junk)-1) != -1);
253 if (!reinit) {
254 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
255 exit(1);
256 }
257 /* This forces creation of new config file */
259 sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
260 git_config_set("core.repositoryformatversion", repo_version_string);
261 path[len] = 0;
263 strcpy(path + len, "config");
264 /* Check filemode trustability */
266 filemode = TEST_FILEMODE;
267 if (TEST_FILEMODE && !lstat(path, &st1)) {
268 struct stat st2;
269 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
270 !lstat(path, &st2) &&
271 st1.st_mode != st2.st_mode);
272 }
273 git_config_set("core.filemode", filemode ? "true" : "false");
274 if (is_bare_repository())
276 git_config_set("core.bare", "true");
277 else {
278 const char *work_tree = get_git_work_tree();
279 git_config_set("core.bare", "false");
280 /* allow template config file to override the default */
281 if (log_all_ref_updates == -1)
282 git_config_set("core.logallrefupdates", "true");
283 if (needs_work_tree_config(git_dir, work_tree))
284 git_config_set("core.worktree", work_tree);
285 }
286 if (!reinit) {
288 /* Check if symlink is supported in the work tree */
289 path[len] = 0;
290 strcpy(path + len, "tXXXXXX");
291 if (!close(xmkstemp(path)) &&
292 !unlink(path) &&
293 !symlink("testing", path) &&
294 !lstat(path, &st1) &&
295 S_ISLNK(st1.st_mode))
296 unlink(path); /* good */
297 else
298 git_config_set("core.symlinks", "false");
299 /* Check if the filesystem is case-insensitive */
301 path[len] = 0;
302 strcpy(path + len, "CoNfIg");
303 if (!access(path, F_OK))
304 git_config_set("core.ignorecase", "true");
305 probe_utf8_pathname_composition(path, len);
306 }
307 return reinit;
309}
310static void create_object_directory(void)
312{
313 const char *object_directory = get_object_directory();
314 int len = strlen(object_directory);
315 char *path = xmalloc(len + 40);
316 memcpy(path, object_directory, len);
318 safe_create_dir(object_directory, 1);
320 strcpy(path+len, "/pack");
321 safe_create_dir(path, 1);
322 strcpy(path+len, "/info");
323 safe_create_dir(path, 1);
324 free(path);
326}
327int set_git_dir_init(const char *git_dir, const char *real_git_dir,
329 int exist_ok)
330{
331 if (real_git_dir) {
332 struct stat st;
333 if (!exist_ok && !stat(git_dir, &st))
335 die(_("%s already exists"), git_dir);
336 if (!exist_ok && !stat(real_git_dir, &st))
338 die(_("%s already exists"), real_git_dir);
339 /*
341 * make sure symlinks are resolved because we'll be
342 * moving the target repo later on in separate_git_dir()
343 */
344 git_link = xstrdup(real_path(git_dir));
345 }
346 else {
347 real_git_dir = real_path(git_dir);
348 git_link = NULL;
349 }
350 set_git_dir(real_path(real_git_dir));
351 return 0;
352}
353static void separate_git_dir(const char *git_dir)
355{
356 struct stat st;
357 FILE *fp;
358 if (!stat(git_link, &st)) {
360 const char *src;
361 if (S_ISREG(st.st_mode))
363 src = read_gitfile(git_link);
364 else if (S_ISDIR(st.st_mode))
365 src = git_link;
366 else
367 die(_("unable to handle file type %d"), (int)st.st_mode);
368 if (rename(src, git_dir))
370 die_errno(_("unable to move %s to %s"), src, git_dir);
371 }
372 fp = fopen(git_link, "w");
374 if (!fp)
375 die(_("Could not create git link %s"), git_link);
376 fprintf(fp, "gitdir: %s\n", git_dir);
377 fclose(fp);
378}
379int init_db(const char *template_dir, unsigned int flags)
381{
382 int reinit;
383 const char *git_dir = get_git_dir();
384 if (git_link)
386 separate_git_dir(git_dir);
387 safe_create_dir(git_dir, 0);
389 init_is_bare_repository = is_bare_repository();
391 /* Check to see if the repository version is right.
393 * Note that a newly created repository does not have
394 * config file, so this will not fail. What we are catching
395 * is an attempt to reinitialize new repository with an old tool.
396 */
397 check_repository_format();
398 reinit = create_default_files(template_dir);
400 create_object_directory();
402 if (shared_repository) {
404 char buf[10];
405 /* We do not spell "group" and such, so that
406 * the configuration can be read by older version
407 * of git. Note, we use octal numbers for new share modes,
408 * and compatibility values for PERM_GROUP and
409 * PERM_EVERYBODY.
410 */
411 if (shared_repository < 0)
412 /* force to the mode value */
413 sprintf(buf, "0%o", -shared_repository);
414 else if (shared_repository == PERM_GROUP)
415 sprintf(buf, "%d", OLD_PERM_GROUP);
416 else if (shared_repository == PERM_EVERYBODY)
417 sprintf(buf, "%d", OLD_PERM_EVERYBODY);
418 else
419 die("oops");
420 git_config_set("core.sharedrepository", buf);
421 git_config_set("receive.denyNonFastforwards", "true");
422 }
423 if (!(flags & INIT_DB_QUIET)) {
425 int len = strlen(git_dir);
426 /* TRANSLATORS: The first '%s' is either "Reinitialized
428 existing" or "Initialized empty", the second " shared" or
429 "", and the last '%s%s' is the verbatim directory name. */
430 printf(_("%s%s Git repository in %s%s\n"),
431 reinit ? _("Reinitialized existing") : _("Initialized empty"),
432 shared_repository ? _(" shared") : "",
433 git_dir, len && git_dir[len-1] != '/' ? "/" : "");
434 }
435 return 0;
437}
438static int guess_repository_type(const char *git_dir)
440{
441 char cwd[PATH_MAX];
442 const char *slash;
443 /*
445 * "GIT_DIR=. git init" is always bare.
446 * "GIT_DIR=`pwd` git init" too.
447 */
448 if (!strcmp(".", git_dir))
449 return 1;
450 if (!getcwd(cwd, sizeof(cwd)))
451 die_errno(_("cannot tell cwd"));
452 if (!strcmp(git_dir, cwd))
453 return 1;
454 /*
455 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
456 */
457 if (!strcmp(git_dir, ".git"))
458 return 0;
459 slash = strrchr(git_dir, '/');
460 if (slash && !strcmp(slash, "/.git"))
461 return 0;
462 /*
464 * Otherwise it is often bare. At this point
465 * we are just guessing.
466 */
467 return 1;
468}
469static int shared_callback(const struct option *opt, const char *arg, int unset)
471{
472 *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
473 return 0;
474}
475static const char *const init_db_usage[] = {
477 N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]"),
478 NULL
479};
480/*
482 * If you want to, you can share the DB area with any number of branches.
483 * That has advantages: you can save space by sharing all the SHA1 objects.
484 * On the other hand, it might just make lookup slower and messier. You
485 * be the judge. The default case is to have one DB per managed directory.
486 */
487int cmd_init_db(int argc, const char **argv, const char *prefix)
488{
489 const char *git_dir;
490 const char *real_git_dir = NULL;
491 const char *work_tree;
492 const char *template_dir = NULL;
493 unsigned int flags = 0;
494 const struct option init_db_options[] = {
495 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
496 N_("directory from which templates will be used")),
497 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
498 N_("create a bare repository"), 1),
499 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
500 N_("permissions"),
501 N_("specify that the git repository is to be shared amongst several users"),
502 PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
503 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
504 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
505 N_("separate git dir from working tree")),
506 OPT_END()
507 };
508 argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
510 if (real_git_dir && !is_absolute_path(real_git_dir))
512 real_git_dir = xstrdup(real_path(real_git_dir));
513 if (argc == 1) {
515 int mkdir_tried = 0;
516 retry:
517 if (chdir(argv[0]) < 0) {
518 if (!mkdir_tried) {
519 int saved;
520 /*
521 * At this point we haven't read any configuration,
522 * and we know shared_repository should always be 0;
523 * but just in case we play safe.
524 */
525 saved = shared_repository;
526 shared_repository = 0;
527 switch (safe_create_leading_directories_const(argv[0])) {
528 case SCLD_OK:
529 case SCLD_PERMS:
530 break;
531 case SCLD_EXISTS:
532 errno = EEXIST;
533 /* fallthru */
534 default:
535 die_errno(_("cannot mkdir %s"), argv[0]);
536 break;
537 }
538 shared_repository = saved;
539 if (mkdir(argv[0], 0777) < 0)
540 die_errno(_("cannot mkdir %s"), argv[0]);
541 mkdir_tried = 1;
542 goto retry;
543 }
544 die_errno(_("cannot chdir to %s"), argv[0]);
545 }
546 } else if (0 < argc) {
547 usage(init_db_usage[0]);
548 }
549 if (is_bare_repository_cfg == 1) {
550 static char git_dir[PATH_MAX+1];
551 setenv(GIT_DIR_ENVIRONMENT,
553 getcwd(git_dir, sizeof(git_dir)), argc > 0);
554 }
555 if (init_shared_repository != -1)
557 shared_repository = init_shared_repository;
558 /*
560 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
561 * without --bare. Catch the error early.
562 */
563 git_dir = getenv(GIT_DIR_ENVIRONMENT);
564 work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
565 if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
566 die(_("%s (or --work-tree=<directory>) not allowed without "
567 "specifying %s (or --git-dir=<directory>)"),
568 GIT_WORK_TREE_ENVIRONMENT,
569 GIT_DIR_ENVIRONMENT);
570 /*
572 * Set up the default .git directory contents
573 */
574 if (!git_dir)
575 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
576 if (is_bare_repository_cfg < 0)
578 is_bare_repository_cfg = guess_repository_type(git_dir);
579 if (!is_bare_repository_cfg) {
581 const char *git_dir_parent = strrchr(git_dir, '/');
582 if (git_dir_parent) {
583 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
584 git_work_tree_cfg = xstrdup(real_path(rel));
585 free(rel);
586 }
587 if (!git_work_tree_cfg) {
588 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
589 if (!getcwd(git_work_tree_cfg, PATH_MAX))
590 die_errno (_("Cannot access current working directory"));
591 }
592 if (work_tree)
593 set_git_work_tree(real_path(work_tree));
594 else
595 set_git_work_tree(git_work_tree_cfg);
596 if (access(get_git_work_tree(), X_OK))
597 die_errno (_("Cannot access work tree '%s'"),
598 get_git_work_tree());
599 }
600 else {
601 if (work_tree)
602 set_git_work_tree(real_path(work_tree));
603 }
604 set_git_dir_init(git_dir, real_git_dir, 1);
606 return init_db(template_dir, flags);
608}