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#ifndef DEFAULT_GIT_TEMPLATE_DIR
11#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
12#endif
13#ifdef NO_TRUSTABLE_FILEMODE
15#define TEST_FILEMODE 0
16#else
17#define TEST_FILEMODE 1
18#endif
19static int init_is_bare_repository = 0;
21static int init_shared_repository = -1;
22static void safe_create_dir(const char *dir, int share)
24{
25 if (mkdir(dir, 0777) < 0) {
26 if (errno != EEXIST) {
27 perror(dir);
28 exit(1);
29 }
30 }
31 else if (share && adjust_shared_perm(dir))
32 die("Could not make %s writable by group", dir);
33}
34static void copy_templates_1(char *path, int baselen,
36 char *template, int template_baselen,
37 DIR *dir)
38{
39 struct dirent *de;
40 /* Note: if ".git/hooks" file exists in the repository being
42 * re-initialized, /etc/core-git/templates/hooks/update would
43 * cause "git init" to fail here. I think this is sane but
44 * it means that the set of templates we ship by default, along
45 * with the way the namespace under .git/ is organized, should
46 * be really carefully chosen.
47 */
48 safe_create_dir(path, 1);
49 while ((de = readdir(dir)) != NULL) {
50 struct stat st_git, st_template;
51 int namelen;
52 int exists = 0;
53 if (de->d_name[0] == '.')
55 continue;
56 namelen = strlen(de->d_name);
57 if ((PATH_MAX <= baselen + namelen) ||
58 (PATH_MAX <= template_baselen + namelen))
59 die("insanely long template name %s", de->d_name);
60 memcpy(path + baselen, de->d_name, namelen+1);
61 memcpy(template + template_baselen, de->d_name, namelen+1);
62 if (lstat(path, &st_git)) {
63 if (errno != ENOENT)
64 die("cannot stat %s", path);
65 }
66 else
67 exists = 1;
68 if (lstat(template, &st_template))
70 die("cannot stat template %s", template);
71 if (S_ISDIR(st_template.st_mode)) {
73 DIR *subdir = opendir(template);
74 int baselen_sub = baselen + namelen;
75 int template_baselen_sub = template_baselen + namelen;
76 if (!subdir)
77 die("cannot opendir %s", template);
78 path[baselen_sub++] =
79 template[template_baselen_sub++] = '/';
80 path[baselen_sub] =
81 template[template_baselen_sub] = 0;
82 copy_templates_1(path, baselen_sub,
83 template, template_baselen_sub,
84 subdir);
85 closedir(subdir);
86 }
87 else if (exists)
88 continue;
89 else if (S_ISLNK(st_template.st_mode)) {
90 char lnk[256];
91 int len;
92 len = readlink(template, lnk, sizeof(lnk));
93 if (len < 0)
94 die("cannot readlink %s", template);
95 if (sizeof(lnk) <= len)
96 die("insanely long symlink %s", template);
97 lnk[len] = 0;
98 if (symlink(lnk, path))
99 die("cannot symlink %s %s", lnk, path);
100 }
101 else if (S_ISREG(st_template.st_mode)) {
102 if (copy_file(path, template, st_template.st_mode))
103 die("cannot copy %s to %s", template, path);
104 }
105 else
106 error("ignoring template %s", template);
107 }
108}
109static void copy_templates(const char *template_dir)
111{
112 char path[PATH_MAX];
113 char template_path[PATH_MAX];
114 int template_len;
115 DIR *dir;
116 const char *git_dir = get_git_dir();
117 int len = strlen(git_dir);
118 if (!template_dir)
120 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
121 if (!template_dir)
122 template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
123 if (!template_dir[0])
124 return;
125 strcpy(template_path, template_dir);
126 template_len = strlen(template_path);
127 if (template_path[template_len-1] != '/') {
128 template_path[template_len++] = '/';
129 template_path[template_len] = 0;
130 }
131 dir = opendir(template_path);
132 if (!dir) {
133 fprintf(stderr, "warning: templates not found %s\n",
134 template_dir);
135 return;
136 }
137 /* Make sure that template is from the correct vintage */
139 strcpy(template_path + template_len, "config");
140 repository_format_version = 0;
141 git_config_from_file(check_repository_format_version,
142 template_path, NULL);
143 template_path[template_len] = 0;
144 if (repository_format_version &&
146 repository_format_version != GIT_REPO_VERSION) {
147 fprintf(stderr, "warning: not copying templates of "
148 "a wrong format version %d from '%s'\n",
149 repository_format_version,
150 template_dir);
151 closedir(dir);
152 return;
153 }
154 memcpy(path, git_dir, len);
156 if (len && path[len - 1] != '/')
157 path[len++] = '/';
158 path[len] = 0;
159 copy_templates_1(path, len,
160 template_path, template_len,
161 dir);
162 closedir(dir);
163}
164static int create_default_files(const char *template_path)
166{
167 const char *git_dir = get_git_dir();
168 unsigned len = strlen(git_dir);
169 static char path[PATH_MAX];
170 struct stat st1;
171 char repo_version_string[10];
172 char junk[2];
173 int reinit;
174 int filemode;
175 if (len > sizeof(path)-50)
177 die("insane git directory %s", git_dir);
178 memcpy(path, git_dir, len);
179 if (len && path[len-1] != '/')
181 path[len++] = '/';
182 /*
184 * Create .git/refs/{heads,tags}
185 */
186 safe_create_dir(git_path("refs"), 1);
187 safe_create_dir(git_path("refs/heads"), 1);
188 safe_create_dir(git_path("refs/tags"), 1);
189 /* First copy the templates -- we might have the default
191 * config file there, in which case we would want to read
192 * from it after installing.
193 */
194 copy_templates(template_path);
195 git_config(git_default_config, NULL);
197 is_bare_repository_cfg = init_is_bare_repository;
198 if (init_shared_repository != -1)
199 shared_repository = init_shared_repository;
200 /*
202 * We would have created the above under user's umask -- under
203 * shared-repository settings, we would need to fix them up.
204 */
205 if (shared_repository) {
206 adjust_shared_perm(get_git_dir());
207 adjust_shared_perm(git_path("refs"));
208 adjust_shared_perm(git_path("refs/heads"));
209 adjust_shared_perm(git_path("refs/tags"));
210 }
211 /*
213 * Create the default symlink from ".git/HEAD" to the "master"
214 * branch, if it does not exist yet.
215 */
216 strcpy(path + len, "HEAD");
217 reinit = (!access(path, R_OK)
218 || readlink(path, junk, sizeof(junk)-1) != -1);
219 if (!reinit) {
220 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
221 exit(1);
222 }
223 /* This forces creation of new config file */
225 sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
226 git_config_set("core.repositoryformatversion", repo_version_string);
227 path[len] = 0;
229 strcpy(path + len, "config");
230 /* Check filemode trustability */
232 filemode = TEST_FILEMODE;
233 if (TEST_FILEMODE && !lstat(path, &st1)) {
234 struct stat st2;
235 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
236 !lstat(path, &st2) &&
237 st1.st_mode != st2.st_mode);
238 }
239 git_config_set("core.filemode", filemode ? "true" : "false");
240 if (is_bare_repository())
242 git_config_set("core.bare", "true");
243 else {
244 const char *work_tree = get_git_work_tree();
245 git_config_set("core.bare", "false");
246 /* allow template config file to override the default */
247 if (log_all_ref_updates == -1)
248 git_config_set("core.logallrefupdates", "true");
249 if (prefixcmp(git_dir, work_tree) ||
250 strcmp(git_dir + strlen(work_tree), "/.git")) {
251 git_config_set("core.worktree", work_tree);
252 }
253 }
254 if (!reinit) {
256 /* Check if symlink is supported in the work tree */
257 path[len] = 0;
258 strcpy(path + len, "tXXXXXX");
259 if (!close(xmkstemp(path)) &&
260 !unlink(path) &&
261 !symlink("testing", path) &&
262 !lstat(path, &st1) &&
263 S_ISLNK(st1.st_mode))
264 unlink(path); /* good */
265 else
266 git_config_set("core.symlinks", "false");
267 /* Check if the filesystem is case-insensitive */
269 path[len] = 0;
270 strcpy(path + len, "CoNfIg");
271 if (!access(path, F_OK))
272 git_config_set("core.ignorecase", "true");
273 }
274 return reinit;
276}
277int init_db(const char *template_dir, unsigned int flags)
279{
280 const char *sha1_dir;
281 char *path;
282 int len, reinit;
283 safe_create_dir(get_git_dir(), 0);
285 init_is_bare_repository = is_bare_repository();
287 /* Check to see if the repository version is right.
289 * Note that a newly created repository does not have
290 * config file, so this will not fail. What we are catching
291 * is an attempt to reinitialize new repository with an old tool.
292 */
293 check_repository_format();
294 reinit = create_default_files(template_dir);
296 sha1_dir = get_object_directory();
298 len = strlen(sha1_dir);
299 path = xmalloc(len + 40);
300 memcpy(path, sha1_dir, len);
301 safe_create_dir(sha1_dir, 1);
303 strcpy(path+len, "/pack");
304 safe_create_dir(path, 1);
305 strcpy(path+len, "/info");
306 safe_create_dir(path, 1);
307 if (shared_repository) {
309 char buf[10];
310 /* We do not spell "group" and such, so that
311 * the configuration can be read by older version
312 * of git. Note, we use octal numbers for new share modes,
313 * and compatibility values for PERM_GROUP and
314 * PERM_EVERYBODY.
315 */
316 if (shared_repository == PERM_GROUP)
317 sprintf(buf, "%d", OLD_PERM_GROUP);
318 else if (shared_repository == PERM_EVERYBODY)
319 sprintf(buf, "%d", OLD_PERM_EVERYBODY);
320 else
321 sprintf(buf, "0%o", shared_repository);
322 git_config_set("core.sharedrepository", buf);
323 git_config_set("receive.denyNonFastforwards", "true");
324 }
325 if (!(flags & INIT_DB_QUIET))
327 printf("%s%s Git repository in %s/\n",
328 reinit ? "Reinitialized existing" : "Initialized empty",
329 shared_repository ? " shared" : "",
330 get_git_dir());
331 return 0;
333}
334static int guess_repository_type(const char *git_dir)
336{
337 char cwd[PATH_MAX];
338 const char *slash;
339 /*
341 * "GIT_DIR=. git init" is always bare.
342 * "GIT_DIR=`pwd` git init" too.
343 */
344 if (!strcmp(".", git_dir))
345 return 1;
346 if (!getcwd(cwd, sizeof(cwd)))
347 die("cannot tell cwd");
348 if (!strcmp(git_dir, cwd))
349 return 1;
350 /*
351 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
352 */
353 if (!strcmp(git_dir, ".git"))
354 return 0;
355 slash = strrchr(git_dir, '/');
356 if (slash && !strcmp(slash, "/.git"))
357 return 0;
358 /*
360 * Otherwise it is often bare. At this point
361 * we are just guessing.
362 */
363 return 1;
364}
365static const char init_db_usage[] =
367"git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]]";
368/*
370 * If you want to, you can share the DB area with any number of branches.
371 * That has advantages: you can save space by sharing all the SHA1 objects.
372 * On the other hand, it might just make lookup slower and messier. You
373 * be the judge. The default case is to have one DB per managed directory.
374 */
375int cmd_init_db(int argc, const char **argv, const char *prefix)
376{
377 const char *git_dir;
378 const char *template_dir = NULL;
379 unsigned int flags = 0;
380 int i;
381 for (i = 1; i < argc; i++, argv++) {
383 const char *arg = argv[1];
384 if (!prefixcmp(arg, "--template="))
385 template_dir = arg+11;
386 else if (!strcmp(arg, "--bare")) {
387 static char git_dir[PATH_MAX+1];
388 is_bare_repository_cfg = 1;
389 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir,
390 sizeof(git_dir)), 0);
391 } else if (!strcmp(arg, "--shared"))
392 init_shared_repository = PERM_GROUP;
393 else if (!prefixcmp(arg, "--shared="))
394 init_shared_repository = git_config_perm("arg", arg+9);
395 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
396 flags |= INIT_DB_QUIET;
397 else
398 usage(init_db_usage);
399 }
400 /*
402 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
403 * without --bare. Catch the error early.
404 */
405 git_dir = getenv(GIT_DIR_ENVIRONMENT);
406 if ((!git_dir || is_bare_repository_cfg == 1)
407 && getenv(GIT_WORK_TREE_ENVIRONMENT))
408 die("%s (or --work-tree=<directory>) not allowed without "
409 "specifying %s (or --git-dir=<directory>)",
410 GIT_WORK_TREE_ENVIRONMENT,
411 GIT_DIR_ENVIRONMENT);
412 /*
414 * Set up the default .git directory contents
415 */
416 if (!git_dir)
417 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
418 if (is_bare_repository_cfg < 0)
420 is_bare_repository_cfg = guess_repository_type(git_dir);
421 if (!is_bare_repository_cfg) {
423 if (git_dir) {
424 const char *git_dir_parent = strrchr(git_dir, '/');
425 if (git_dir_parent) {
426 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
427 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
428 free(rel);
429 }
430 }
431 if (!git_work_tree_cfg) {
432 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
433 if (!getcwd(git_work_tree_cfg, PATH_MAX))
434 die ("Cannot access current working directory.");
435 }
436 if (access(get_git_work_tree(), X_OK))
437 die ("Cannot access work tree '%s'",
438 get_git_work_tree());
439 }
440 set_git_dir(make_absolute_path(git_dir));
442 return init_db(template_dir, flags);
444}