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 void safe_create_dir(const char *dir, int share)
26{
27 if (mkdir(dir, 0777) < 0) {
28 if (errno != EEXIST) {
29 perror(dir);
30 exit(1);
31 }
32 }
33 else if (share && adjust_shared_perm(dir))
34 die("Could not make %s writable by group", dir);
35}
36static void copy_templates_1(char *path, int baselen,
38 char *template, int template_baselen,
39 DIR *dir)
40{
41 struct dirent *de;
42 /* Note: if ".git/hooks" file exists in the repository being
44 * re-initialized, /etc/core-git/templates/hooks/update would
45 * cause "git init" to fail here. I think this is sane but
46 * it means that the set of templates we ship by default, along
47 * with the way the namespace under .git/ is organized, should
48 * be really carefully chosen.
49 */
50 safe_create_dir(path, 1);
51 while ((de = readdir(dir)) != NULL) {
52 struct stat st_git, st_template;
53 int namelen;
54 int exists = 0;
55 if (de->d_name[0] == '.')
57 continue;
58 namelen = strlen(de->d_name);
59 if ((PATH_MAX <= baselen + namelen) ||
60 (PATH_MAX <= template_baselen + namelen))
61 die("insanely long template name %s", de->d_name);
62 memcpy(path + baselen, de->d_name, namelen+1);
63 memcpy(template + template_baselen, de->d_name, namelen+1);
64 if (lstat(path, &st_git)) {
65 if (errno != ENOENT)
66 die_errno("cannot stat '%s'", path);
67 }
68 else
69 exists = 1;
70 if (lstat(template, &st_template))
72 die_errno("cannot stat template '%s'", template);
73 if (S_ISDIR(st_template.st_mode)) {
75 DIR *subdir = opendir(template);
76 int baselen_sub = baselen + namelen;
77 int template_baselen_sub = template_baselen + namelen;
78 if (!subdir)
79 die_errno("cannot opendir '%s'", template);
80 path[baselen_sub++] =
81 template[template_baselen_sub++] = '/';
82 path[baselen_sub] =
83 template[template_baselen_sub] = 0;
84 copy_templates_1(path, baselen_sub,
85 template, template_baselen_sub,
86 subdir);
87 closedir(subdir);
88 }
89 else if (exists)
90 continue;
91 else if (S_ISLNK(st_template.st_mode)) {
92 char lnk[256];
93 int len;
94 len = readlink(template, lnk, sizeof(lnk));
95 if (len < 0)
96 die_errno("cannot readlink '%s'", template);
97 if (sizeof(lnk) <= len)
98 die("insanely long symlink %s", template);
99 lnk[len] = 0;
100 if (symlink(lnk, path))
101 die_errno("cannot symlink '%s' '%s'", lnk, path);
102 }
103 else if (S_ISREG(st_template.st_mode)) {
104 if (copy_file(path, template, st_template.st_mode))
105 die_errno("cannot copy '%s' to '%s'", template,
106 path);
107 }
108 else
109 error("ignoring template %s", template);
110 }
111}
112static void copy_templates(const char *template_dir)
114{
115 char path[PATH_MAX];
116 char template_path[PATH_MAX];
117 int template_len;
118 DIR *dir;
119 const char *git_dir = get_git_dir();
120 int len = strlen(git_dir);
121 if (!template_dir)
123 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
124 if (!template_dir)
125 template_dir = init_db_template_dir;
126 if (!template_dir)
127 template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
128 if (!template_dir[0])
129 return;
130 template_len = strlen(template_dir);
131 if (PATH_MAX <= (template_len+strlen("/config")))
132 die("insanely long template path %s", template_dir);
133 strcpy(template_path, template_dir);
134 if (template_path[template_len-1] != '/') {
135 template_path[template_len++] = '/';
136 template_path[template_len] = 0;
137 }
138 dir = opendir(template_path);
139 if (!dir) {
140 warning("templates not found %s", template_dir);
141 return;
142 }
143 /* Make sure that template is from the correct vintage */
145 strcpy(template_path + template_len, "config");
146 repository_format_version = 0;
147 git_config_from_file(check_repository_format_version,
148 template_path, NULL);
149 template_path[template_len] = 0;
150 if (repository_format_version &&
152 repository_format_version != GIT_REPO_VERSION) {
153 warning("not copying templates of "
154 "a wrong format version %d from '%s'",
155 repository_format_version,
156 template_dir);
157 closedir(dir);
158 return;
159 }
160 memcpy(path, git_dir, len);
162 if (len && path[len - 1] != '/')
163 path[len++] = '/';
164 path[len] = 0;
165 copy_templates_1(path, len,
166 template_path, template_len,
167 dir);
168 closedir(dir);
169}
170static int git_init_db_config(const char *k, const char *v, void *cb)
172{
173 if (!v)
174 return config_error_nonbool(k);
175 if (!strcmp(k, "init.templatedir"))
176 return git_config_pathname(&init_db_template_dir, k, v);
177 return 0;
179}
180static int create_default_files(const char *template_path)
182{
183 const char *git_dir = get_git_dir();
184 unsigned len = strlen(git_dir);
185 static char path[PATH_MAX];
186 struct stat st1;
187 char repo_version_string[10];
188 char junk[2];
189 int reinit;
190 int filemode;
191 if (len > sizeof(path)-50)
193 die("insane git directory %s", git_dir);
194 memcpy(path, git_dir, len);
195 if (len && path[len-1] != '/')
197 path[len++] = '/';
198 /*
200 * Create .git/refs/{heads,tags}
201 */
202 safe_create_dir(git_path("refs"), 1);
203 safe_create_dir(git_path("refs/heads"), 1);
204 safe_create_dir(git_path("refs/tags"), 1);
205 /* Just look for `init.templatedir` */
207 git_config(git_init_db_config, NULL);
208 /* First copy the templates -- we might have the default
210 * config file there, in which case we would want to read
211 * from it after installing.
212 */
213 copy_templates(template_path);
214 git_config(git_default_config, NULL);
216 is_bare_repository_cfg = init_is_bare_repository;
217 /* reading existing config may have overwrote it */
219 if (init_shared_repository != -1)
220 shared_repository = init_shared_repository;
221 /*
223 * We would have created the above under user's umask -- under
224 * shared-repository settings, we would need to fix them up.
225 */
226 if (shared_repository) {
227 adjust_shared_perm(get_git_dir());
228 adjust_shared_perm(git_path("refs"));
229 adjust_shared_perm(git_path("refs/heads"));
230 adjust_shared_perm(git_path("refs/tags"));
231 }
232 /*
234 * Create the default symlink from ".git/HEAD" to the "master"
235 * branch, if it does not exist yet.
236 */
237 strcpy(path + len, "HEAD");
238 reinit = (!access(path, R_OK)
239 || readlink(path, junk, sizeof(junk)-1) != -1);
240 if (!reinit) {
241 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
242 exit(1);
243 }
244 /* This forces creation of new config file */
246 sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
247 git_config_set("core.repositoryformatversion", repo_version_string);
248 path[len] = 0;
250 strcpy(path + len, "config");
251 /* Check filemode trustability */
253 filemode = TEST_FILEMODE;
254 if (TEST_FILEMODE && !lstat(path, &st1)) {
255 struct stat st2;
256 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
257 !lstat(path, &st2) &&
258 st1.st_mode != st2.st_mode);
259 }
260 git_config_set("core.filemode", filemode ? "true" : "false");
261 if (is_bare_repository())
263 git_config_set("core.bare", "true");
264 else {
265 const char *work_tree = get_git_work_tree();
266 git_config_set("core.bare", "false");
267 /* allow template config file to override the default */
268 if (log_all_ref_updates == -1)
269 git_config_set("core.logallrefupdates", "true");
270 if (prefixcmp(git_dir, work_tree) ||
271 strcmp(git_dir + strlen(work_tree), "/.git")) {
272 git_config_set("core.worktree", work_tree);
273 }
274 }
275 if (!reinit) {
277 /* Check if symlink is supported in the work tree */
278 path[len] = 0;
279 strcpy(path + len, "tXXXXXX");
280 if (!close(xmkstemp(path)) &&
281 !unlink(path) &&
282 !symlink("testing", path) &&
283 !lstat(path, &st1) &&
284 S_ISLNK(st1.st_mode))
285 unlink(path); /* good */
286 else
287 git_config_set("core.symlinks", "false");
288 /* Check if the filesystem is case-insensitive */
290 path[len] = 0;
291 strcpy(path + len, "CoNfIg");
292 if (!access(path, F_OK))
293 git_config_set("core.ignorecase", "true");
294 }
295 return reinit;
297}
298int init_db(const char *template_dir, unsigned int flags)
300{
301 const char *sha1_dir;
302 char *path;
303 int len, reinit;
304 safe_create_dir(get_git_dir(), 0);
306 init_is_bare_repository = is_bare_repository();
308 /* Check to see if the repository version is right.
310 * Note that a newly created repository does not have
311 * config file, so this will not fail. What we are catching
312 * is an attempt to reinitialize new repository with an old tool.
313 */
314 check_repository_format();
315 reinit = create_default_files(template_dir);
317 sha1_dir = get_object_directory();
319 len = strlen(sha1_dir);
320 path = xmalloc(len + 40);
321 memcpy(path, sha1_dir, len);
322 safe_create_dir(sha1_dir, 1);
324 strcpy(path+len, "/pack");
325 safe_create_dir(path, 1);
326 strcpy(path+len, "/info");
327 safe_create_dir(path, 1);
328 if (shared_repository) {
330 char buf[10];
331 /* We do not spell "group" and such, so that
332 * the configuration can be read by older version
333 * of git. Note, we use octal numbers for new share modes,
334 * and compatibility values for PERM_GROUP and
335 * PERM_EVERYBODY.
336 */
337 if (shared_repository < 0)
338 /* force to the mode value */
339 sprintf(buf, "0%o", -shared_repository);
340 else if (shared_repository == PERM_GROUP)
341 sprintf(buf, "%d", OLD_PERM_GROUP);
342 else if (shared_repository == PERM_EVERYBODY)
343 sprintf(buf, "%d", OLD_PERM_EVERYBODY);
344 else
345 die("oops");
346 git_config_set("core.sharedrepository", buf);
347 git_config_set("receive.denyNonFastforwards", "true");
348 }
349 if (!(flags & INIT_DB_QUIET))
351 printf("%s%s Git repository in %s/\n",
352 reinit ? "Reinitialized existing" : "Initialized empty",
353 shared_repository ? " shared" : "",
354 get_git_dir());
355 return 0;
357}
358static int guess_repository_type(const char *git_dir)
360{
361 char cwd[PATH_MAX];
362 const char *slash;
363 /*
365 * "GIT_DIR=. git init" is always bare.
366 * "GIT_DIR=`pwd` git init" too.
367 */
368 if (!strcmp(".", git_dir))
369 return 1;
370 if (!getcwd(cwd, sizeof(cwd)))
371 die_errno("cannot tell cwd");
372 if (!strcmp(git_dir, cwd))
373 return 1;
374 /*
375 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
376 */
377 if (!strcmp(git_dir, ".git"))
378 return 0;
379 slash = strrchr(git_dir, '/');
380 if (slash && !strcmp(slash, "/.git"))
381 return 0;
382 /*
384 * Otherwise it is often bare. At this point
385 * we are just guessing.
386 */
387 return 1;
388}
389static int shared_callback(const struct option *opt, const char *arg, int unset)
391{
392 *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
393 return 0;
394}
395static const char *const init_db_usage[] = {
397 "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]",
398 NULL
399};
400/*
402 * If you want to, you can share the DB area with any number of branches.
403 * That has advantages: you can save space by sharing all the SHA1 objects.
404 * On the other hand, it might just make lookup slower and messier. You
405 * be the judge. The default case is to have one DB per managed directory.
406 */
407int cmd_init_db(int argc, const char **argv, const char *prefix)
408{
409 const char *git_dir;
410 const char *template_dir = NULL;
411 unsigned int flags = 0;
412 const struct option init_db_options[] = {
413 OPT_STRING(0, "template", &template_dir, "template-directory",
414 "provide the directory from which templates will be used"),
415 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
416 "create a bare repository", 1),
417 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
418 "permissions",
419 "specify that the git repository is to be shared amongst several users",
420 PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
421 OPT_BIT('q', "quiet", &flags, "be quiet", INIT_DB_QUIET),
422 OPT_END()
423 };
424 argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
426 if (argc == 1) {
428 int mkdir_tried = 0;
429 retry:
430 if (chdir(argv[0]) < 0) {
431 if (!mkdir_tried) {
432 int saved;
433 /*
434 * At this point we haven't read any configuration,
435 * and we know shared_repository should always be 0;
436 * but just in case we play safe.
437 */
438 saved = shared_repository;
439 shared_repository = 0;
440 switch (safe_create_leading_directories_const(argv[0])) {
441 case -3:
442 errno = EEXIST;
443 /* fallthru */
444 case -1:
445 die_errno("cannot mkdir %s", argv[0]);
446 break;
447 default:
448 break;
449 }
450 shared_repository = saved;
451 if (mkdir(argv[0], 0777) < 0)
452 die_errno("cannot mkdir %s", argv[0]);
453 mkdir_tried = 1;
454 goto retry;
455 }
456 die_errno("cannot chdir to %s", argv[0]);
457 }
458 } else if (0 < argc) {
459 usage(init_db_usage[0]);
460 }
461 if (is_bare_repository_cfg == 1) {
462 static char git_dir[PATH_MAX+1];
463 setenv(GIT_DIR_ENVIRONMENT,
465 getcwd(git_dir, sizeof(git_dir)), 0);
466 }
467 if (init_shared_repository != -1)
469 shared_repository = init_shared_repository;
470 /*
472 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
473 * without --bare. Catch the error early.
474 */
475 git_dir = getenv(GIT_DIR_ENVIRONMENT);
476 if ((!git_dir || is_bare_repository_cfg == 1)
477 && getenv(GIT_WORK_TREE_ENVIRONMENT))
478 die("%s (or --work-tree=<directory>) not allowed without "
479 "specifying %s (or --git-dir=<directory>)",
480 GIT_WORK_TREE_ENVIRONMENT,
481 GIT_DIR_ENVIRONMENT);
482 /*
484 * Set up the default .git directory contents
485 */
486 if (!git_dir)
487 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
488 if (is_bare_repository_cfg < 0)
490 is_bare_repository_cfg = guess_repository_type(git_dir);
491 if (!is_bare_repository_cfg) {
493 if (git_dir) {
494 const char *git_dir_parent = strrchr(git_dir, '/');
495 if (git_dir_parent) {
496 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
497 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
498 free(rel);
499 }
500 }
501 if (!git_work_tree_cfg) {
502 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
503 if (!getcwd(git_work_tree_cfg, PATH_MAX))
504 die_errno ("Cannot access current working directory");
505 }
506 if (access(get_git_work_tree(), X_OK))
507 die_errno ("Cannot access work tree '%s'",
508 get_git_work_tree());
509 }
510 set_git_dir(make_absolute_path(git_dir));
512 return init_db(template_dir, flags);
514}