d8bdf928b1e97864722352955a2e2e37b5c00806
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 void safe_create_dir(const char *dir, int share)
21{
22 if (mkdir(dir, 0777) < 0) {
23 if (errno != EEXIST) {
24 perror(dir);
25 exit(1);
26 }
27 }
28 else if (share && adjust_shared_perm(dir))
29 die("Could not make %s writable by group\n", dir);
30}
31static void copy_templates_1(char *path, int baselen,
33 char *template, int template_baselen,
34 DIR *dir)
35{
36 struct dirent *de;
37 /* Note: if ".git/hooks" file exists in the repository being
39 * re-initialized, /etc/core-git/templates/hooks/update would
40 * cause git-init to fail here. I think this is sane but
41 * it means that the set of templates we ship by default, along
42 * with the way the namespace under .git/ is organized, should
43 * be really carefully chosen.
44 */
45 safe_create_dir(path, 1);
46 while ((de = readdir(dir)) != NULL) {
47 struct stat st_git, st_template;
48 int namelen;
49 int exists = 0;
50 if (de->d_name[0] == '.')
52 continue;
53 namelen = strlen(de->d_name);
54 if ((PATH_MAX <= baselen + namelen) ||
55 (PATH_MAX <= template_baselen + namelen))
56 die("insanely long template name %s", de->d_name);
57 memcpy(path + baselen, de->d_name, namelen+1);
58 memcpy(template + template_baselen, de->d_name, namelen+1);
59 if (lstat(path, &st_git)) {
60 if (errno != ENOENT)
61 die("cannot stat %s", path);
62 }
63 else
64 exists = 1;
65 if (lstat(template, &st_template))
67 die("cannot stat template %s", template);
68 if (S_ISDIR(st_template.st_mode)) {
70 DIR *subdir = opendir(template);
71 int baselen_sub = baselen + namelen;
72 int template_baselen_sub = template_baselen + namelen;
73 if (!subdir)
74 die("cannot opendir %s", template);
75 path[baselen_sub++] =
76 template[template_baselen_sub++] = '/';
77 path[baselen_sub] =
78 template[template_baselen_sub] = 0;
79 copy_templates_1(path, baselen_sub,
80 template, template_baselen_sub,
81 subdir);
82 closedir(subdir);
83 }
84 else if (exists)
85 continue;
86 else if (S_ISLNK(st_template.st_mode)) {
87 char lnk[256];
88 int len;
89 len = readlink(template, lnk, sizeof(lnk));
90 if (len < 0)
91 die("cannot readlink %s", template);
92 if (sizeof(lnk) <= len)
93 die("insanely long symlink %s", template);
94 lnk[len] = 0;
95 if (symlink(lnk, path))
96 die("cannot symlink %s %s", lnk, path);
97 }
98 else if (S_ISREG(st_template.st_mode)) {
99 if (copy_file(path, template, st_template.st_mode))
100 die("cannot copy %s to %s", template, path);
101 }
102 else
103 error("ignoring template %s", template);
104 }
105}
106static void copy_templates(const char *template_dir)
108{
109 char path[PATH_MAX];
110 char template_path[PATH_MAX];
111 int template_len;
112 DIR *dir;
113 const char *git_dir = get_git_dir();
114 int len = strlen(git_dir);
115 if (!template_dir)
117 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
118 if (!template_dir) {
119 /*
120 * if the hard-coded template is relative, it is
121 * interpreted relative to the exec_dir
122 */
123 template_dir = DEFAULT_GIT_TEMPLATE_DIR;
124 if (!is_absolute_path(template_dir)) {
125 struct strbuf d = STRBUF_INIT;
126 strbuf_addf(&d, "%s/%s", git_exec_path(), template_dir);
127 template_dir = strbuf_detach(&d, NULL);
128 }
129 }
130 strcpy(template_path, template_dir);
131 template_len = strlen(template_path);
132 if (template_path[template_len-1] != '/') {
133 template_path[template_len++] = '/';
134 template_path[template_len] = 0;
135 }
136 dir = opendir(template_path);
137 if (!dir) {
138 fprintf(stderr, "warning: templates not found %s\n",
139 template_dir);
140 return;
141 }
142 /* Make sure that template is from the correct vintage */
144 strcpy(template_path + template_len, "config");
145 repository_format_version = 0;
146 git_config_from_file(check_repository_format_version,
147 template_path, NULL);
148 template_path[template_len] = 0;
149 if (repository_format_version &&
151 repository_format_version != GIT_REPO_VERSION) {
152 fprintf(stderr, "warning: not copying templates of "
153 "a wrong format version %d from '%s'\n",
154 repository_format_version,
155 template_dir);
156 closedir(dir);
157 return;
158 }
159 memcpy(path, git_dir, len);
161 if (len && path[len - 1] != '/')
162 path[len++] = '/';
163 path[len] = 0;
164 copy_templates_1(path, len,
165 template_path, template_len,
166 dir);
167 closedir(dir);
168}
169static int create_default_files(const char *template_path)
171{
172 const char *git_dir = get_git_dir();
173 unsigned len = strlen(git_dir);
174 static char path[PATH_MAX];
175 struct stat st1;
176 char repo_version_string[10];
177 char junk[2];
178 int reinit;
179 int filemode;
180 if (len > sizeof(path)-50)
182 die("insane git directory %s", git_dir);
183 memcpy(path, git_dir, len);
184 if (len && path[len-1] != '/')
186 path[len++] = '/';
187 /*
189 * Create .git/refs/{heads,tags}
190 */
191 safe_create_dir(git_path("refs"), 1);
192 safe_create_dir(git_path("refs/heads"), 1);
193 safe_create_dir(git_path("refs/tags"), 1);
194 /* First copy the templates -- we might have the default
196 * config file there, in which case we would want to read
197 * from it after installing.
198 */
199 copy_templates(template_path);
200 git_config(git_default_config, NULL);
202 /*
204 * We would have created the above under user's umask -- under
205 * shared-repository settings, we would need to fix them up.
206 */
207 if (shared_repository) {
208 adjust_shared_perm(get_git_dir());
209 adjust_shared_perm(git_path("refs"));
210 adjust_shared_perm(git_path("refs/heads"));
211 adjust_shared_perm(git_path("refs/tags"));
212 }
213 /*
215 * Create the default symlink from ".git/HEAD" to the "master"
216 * branch, if it does not exist yet.
217 */
218 strcpy(path + len, "HEAD");
219 reinit = (!access(path, R_OK)
220 || readlink(path, junk, sizeof(junk)-1) != -1);
221 if (!reinit) {
222 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
223 exit(1);
224 }
225 /* This forces creation of new config file */
227 sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
228 git_config_set("core.repositoryformatversion", repo_version_string);
229 path[len] = 0;
231 strcpy(path + len, "config");
232 /* Check filemode trustability */
234 filemode = TEST_FILEMODE;
235 if (TEST_FILEMODE && !lstat(path, &st1)) {
236 struct stat st2;
237 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
238 !lstat(path, &st2) &&
239 st1.st_mode != st2.st_mode);
240 }
241 git_config_set("core.filemode", filemode ? "true" : "false");
242 if (is_bare_repository())
244 git_config_set("core.bare", "true");
245 else {
246 const char *work_tree = get_git_work_tree();
247 git_config_set("core.bare", "false");
248 /* allow template config file to override the default */
249 if (log_all_ref_updates == -1)
250 git_config_set("core.logallrefupdates", "true");
251 if (prefixcmp(git_dir, work_tree) ||
252 strcmp(git_dir + strlen(work_tree), "/.git")) {
253 git_config_set("core.worktree", work_tree);
254 }
255 }
256 if (!reinit) {
258 /* Check if symlink is supported in the work tree */
259 path[len] = 0;
260 strcpy(path + len, "tXXXXXX");
261 if (!close(xmkstemp(path)) &&
262 !unlink(path) &&
263 !symlink("testing", path) &&
264 !lstat(path, &st1) &&
265 S_ISLNK(st1.st_mode))
266 unlink(path); /* good */
267 else
268 git_config_set("core.symlinks", "false");
269 /* Check if the filesystem is case-insensitive */
271 path[len] = 0;
272 strcpy(path + len, "CoNfIg");
273 if (!access(path, F_OK))
274 git_config_set("core.ignorecase", "true");
275 }
276 return reinit;
278}
279int init_db(const char *template_dir, unsigned int flags)
281{
282 const char *sha1_dir;
283 char *path;
284 int len, reinit;
285 safe_create_dir(get_git_dir(), 0);
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] [--template=<template-directory>] [--shared]";
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, "--shared"))
387 shared_repository = PERM_GROUP;
388 else if (!prefixcmp(arg, "--shared="))
389 shared_repository = git_config_perm("arg", arg+9);
390 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
391 flags |= INIT_DB_QUIET;
392 else
393 usage(init_db_usage);
394 }
395 /*
397 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
398 * without --bare. Catch the error early.
399 */
400 git_dir = getenv(GIT_DIR_ENVIRONMENT);
401 if ((!git_dir || is_bare_repository_cfg == 1)
402 && getenv(GIT_WORK_TREE_ENVIRONMENT))
403 die("%s (or --work-tree=<directory>) not allowed without "
404 "specifying %s (or --git-dir=<directory>)",
405 GIT_WORK_TREE_ENVIRONMENT,
406 GIT_DIR_ENVIRONMENT);
407 /*
409 * Set up the default .git directory contents
410 */
411 if (!git_dir)
412 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
413 if (is_bare_repository_cfg < 0)
415 is_bare_repository_cfg = guess_repository_type(git_dir);
416 if (!is_bare_repository_cfg) {
418 if (git_dir) {
419 const char *git_dir_parent = strrchr(git_dir, '/');
420 if (git_dir_parent) {
421 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
422 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
423 free(rel);
424 }
425 }
426 if (!git_work_tree_cfg) {
427 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
428 if (!getcwd(git_work_tree_cfg, PATH_MAX))
429 die ("Cannot access current working directory.");
430 }
431 if (access(get_git_work_tree(), X_OK))
432 die ("Cannot access work tree '%s'",
433 get_git_work_tree());
434 }
435 set_git_dir(make_absolute_path(git_dir));
437 return init_db(template_dir, flags);
439}