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 template_len = strlen(template_dir);
126 if (PATH_MAX <= (template_len+strlen("/config")))
127 die("insanely long template path %s", template_dir);
128 strcpy(template_path, template_dir);
129 if (template_path[template_len-1] != '/') {
130 template_path[template_len++] = '/';
131 template_path[template_len] = 0;
132 }
133 dir = opendir(template_path);
134 if (!dir) {
135 warning("templates not found %s", template_dir);
136 return;
137 }
138 /* Make sure that template is from the correct vintage */
140 strcpy(template_path + template_len, "config");
141 repository_format_version = 0;
142 git_config_from_file(check_repository_format_version,
143 template_path, NULL);
144 template_path[template_len] = 0;
145 if (repository_format_version &&
147 repository_format_version != GIT_REPO_VERSION) {
148 warning("not copying templates of "
149 "a wrong format version %d from '%s'",
150 repository_format_version,
151 template_dir);
152 closedir(dir);
153 return;
154 }
155 memcpy(path, git_dir, len);
157 if (len && path[len - 1] != '/')
158 path[len++] = '/';
159 path[len] = 0;
160 copy_templates_1(path, len,
161 template_path, template_len,
162 dir);
163 closedir(dir);
164}
165static int create_default_files(const char *template_path)
167{
168 const char *git_dir = get_git_dir();
169 unsigned len = strlen(git_dir);
170 static char path[PATH_MAX];
171 struct stat st1;
172 char repo_version_string[10];
173 char junk[2];
174 int reinit;
175 int filemode;
176 if (len > sizeof(path)-50)
178 die("insane git directory %s", git_dir);
179 memcpy(path, git_dir, len);
180 if (len && path[len-1] != '/')
182 path[len++] = '/';
183 /*
185 * Create .git/refs/{heads,tags}
186 */
187 safe_create_dir(git_path("refs"), 1);
188 safe_create_dir(git_path("refs/heads"), 1);
189 safe_create_dir(git_path("refs/tags"), 1);
190 /* First copy the templates -- we might have the default
192 * config file there, in which case we would want to read
193 * from it after installing.
194 */
195 copy_templates(template_path);
196 git_config(git_default_config, NULL);
198 is_bare_repository_cfg = init_is_bare_repository;
199 /* reading existing config may have overwrote it */
201 if (init_shared_repository != -1)
202 shared_repository = init_shared_repository;
203 /*
205 * We would have created the above under user's umask -- under
206 * shared-repository settings, we would need to fix them up.
207 */
208 if (shared_repository) {
209 adjust_shared_perm(get_git_dir());
210 adjust_shared_perm(git_path("refs"));
211 adjust_shared_perm(git_path("refs/heads"));
212 adjust_shared_perm(git_path("refs/tags"));
213 }
214 /*
216 * Create the default symlink from ".git/HEAD" to the "master"
217 * branch, if it does not exist yet.
218 */
219 strcpy(path + len, "HEAD");
220 reinit = (!access(path, R_OK)
221 || readlink(path, junk, sizeof(junk)-1) != -1);
222 if (!reinit) {
223 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
224 exit(1);
225 }
226 /* This forces creation of new config file */
228 sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
229 git_config_set("core.repositoryformatversion", repo_version_string);
230 path[len] = 0;
232 strcpy(path + len, "config");
233 /* Check filemode trustability */
235 filemode = TEST_FILEMODE;
236 if (TEST_FILEMODE && !lstat(path, &st1)) {
237 struct stat st2;
238 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
239 !lstat(path, &st2) &&
240 st1.st_mode != st2.st_mode);
241 }
242 git_config_set("core.filemode", filemode ? "true" : "false");
243 if (is_bare_repository())
245 git_config_set("core.bare", "true");
246 else {
247 const char *work_tree = get_git_work_tree();
248 git_config_set("core.bare", "false");
249 /* allow template config file to override the default */
250 if (log_all_ref_updates == -1)
251 git_config_set("core.logallrefupdates", "true");
252 if (prefixcmp(git_dir, work_tree) ||
253 strcmp(git_dir + strlen(work_tree), "/.git")) {
254 git_config_set("core.worktree", work_tree);
255 }
256 }
257 if (!reinit) {
259 /* Check if symlink is supported in the work tree */
260 path[len] = 0;
261 strcpy(path + len, "tXXXXXX");
262 if (!close(xmkstemp(path)) &&
263 !unlink(path) &&
264 !symlink("testing", path) &&
265 !lstat(path, &st1) &&
266 S_ISLNK(st1.st_mode))
267 unlink(path); /* good */
268 else
269 git_config_set("core.symlinks", "false");
270 /* Check if the filesystem is case-insensitive */
272 path[len] = 0;
273 strcpy(path + len, "CoNfIg");
274 if (!access(path, F_OK))
275 git_config_set("core.ignorecase", "true");
276 }
277 return reinit;
279}
280int init_db(const char *template_dir, unsigned int flags)
282{
283 const char *sha1_dir;
284 char *path;
285 int len, reinit;
286 safe_create_dir(get_git_dir(), 0);
288 init_is_bare_repository = is_bare_repository();
290 /* Check to see if the repository version is right.
292 * Note that a newly created repository does not have
293 * config file, so this will not fail. What we are catching
294 * is an attempt to reinitialize new repository with an old tool.
295 */
296 check_repository_format();
297 reinit = create_default_files(template_dir);
299 sha1_dir = get_object_directory();
301 len = strlen(sha1_dir);
302 path = xmalloc(len + 40);
303 memcpy(path, sha1_dir, len);
304 safe_create_dir(sha1_dir, 1);
306 strcpy(path+len, "/pack");
307 safe_create_dir(path, 1);
308 strcpy(path+len, "/info");
309 safe_create_dir(path, 1);
310 if (shared_repository) {
312 char buf[10];
313 /* We do not spell "group" and such, so that
314 * the configuration can be read by older version
315 * of git. Note, we use octal numbers for new share modes,
316 * and compatibility values for PERM_GROUP and
317 * PERM_EVERYBODY.
318 */
319 if (shared_repository < 0)
320 /* force to the mode value */
321 sprintf(buf, "0%o", -shared_repository);
322 else if (shared_repository == PERM_GROUP)
323 sprintf(buf, "%d", OLD_PERM_GROUP);
324 else if (shared_repository == PERM_EVERYBODY)
325 sprintf(buf, "%d", OLD_PERM_EVERYBODY);
326 else
327 die("oops");
328 git_config_set("core.sharedrepository", buf);
329 git_config_set("receive.denyNonFastforwards", "true");
330 }
331 if (!(flags & INIT_DB_QUIET))
333 printf("%s%s Git repository in %s/\n",
334 reinit ? "Reinitialized existing" : "Initialized empty",
335 shared_repository ? " shared" : "",
336 get_git_dir());
337 return 0;
339}
340static int guess_repository_type(const char *git_dir)
342{
343 char cwd[PATH_MAX];
344 const char *slash;
345 /*
347 * "GIT_DIR=. git init" is always bare.
348 * "GIT_DIR=`pwd` git init" too.
349 */
350 if (!strcmp(".", git_dir))
351 return 1;
352 if (!getcwd(cwd, sizeof(cwd)))
353 die("cannot tell cwd");
354 if (!strcmp(git_dir, cwd))
355 return 1;
356 /*
357 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
358 */
359 if (!strcmp(git_dir, ".git"))
360 return 0;
361 slash = strrchr(git_dir, '/');
362 if (slash && !strcmp(slash, "/.git"))
363 return 0;
364 /*
366 * Otherwise it is often bare. At this point
367 * we are just guessing.
368 */
369 return 1;
370}
371static const char init_db_usage[] =
373"git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]]";
374/*
376 * If you want to, you can share the DB area with any number of branches.
377 * That has advantages: you can save space by sharing all the SHA1 objects.
378 * On the other hand, it might just make lookup slower and messier. You
379 * be the judge. The default case is to have one DB per managed directory.
380 */
381int cmd_init_db(int argc, const char **argv, const char *prefix)
382{
383 const char *git_dir;
384 const char *template_dir = NULL;
385 unsigned int flags = 0;
386 int i;
387 for (i = 1; i < argc; i++, argv++) {
389 const char *arg = argv[1];
390 if (!prefixcmp(arg, "--template="))
391 template_dir = arg+11;
392 else if (!strcmp(arg, "--bare")) {
393 static char git_dir[PATH_MAX+1];
394 is_bare_repository_cfg = 1;
395 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir,
396 sizeof(git_dir)), 0);
397 } else if (!strcmp(arg, "--shared"))
398 init_shared_repository = PERM_GROUP;
399 else if (!prefixcmp(arg, "--shared="))
400 init_shared_repository = git_config_perm("arg", arg+9);
401 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
402 flags |= INIT_DB_QUIET;
403 else
404 usage(init_db_usage);
405 }
406 if (init_shared_repository != -1)
408 shared_repository = init_shared_repository;
409 /*
411 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
412 * without --bare. Catch the error early.
413 */
414 git_dir = getenv(GIT_DIR_ENVIRONMENT);
415 if ((!git_dir || is_bare_repository_cfg == 1)
416 && getenv(GIT_WORK_TREE_ENVIRONMENT))
417 die("%s (or --work-tree=<directory>) not allowed without "
418 "specifying %s (or --git-dir=<directory>)",
419 GIT_WORK_TREE_ENVIRONMENT,
420 GIT_DIR_ENVIRONMENT);
421 /*
423 * Set up the default .git directory contents
424 */
425 if (!git_dir)
426 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
427 if (is_bare_repository_cfg < 0)
429 is_bare_repository_cfg = guess_repository_type(git_dir);
430 if (!is_bare_repository_cfg) {
432 if (git_dir) {
433 const char *git_dir_parent = strrchr(git_dir, '/');
434 if (git_dir_parent) {
435 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
436 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
437 free(rel);
438 }
439 }
440 if (!git_work_tree_cfg) {
441 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
442 if (!getcwd(git_work_tree_cfg, PATH_MAX))
443 die ("Cannot access current working directory.");
444 }
445 if (access(get_git_work_tree(), X_OK))
446 die ("Cannot access work tree '%s'",
447 get_git_work_tree());
448 }
449 set_git_dir(make_absolute_path(git_dir));
451 return init_db(template_dir, flags);
453}