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 if (!template_dir[0])
131 return;
132 strcpy(template_path, template_dir);
133 template_len = strlen(template_path);
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 fprintf(stderr, "warning: templates not found %s\n",
141 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 fprintf(stderr, "warning: not copying templates of "
155 "a wrong format version %d from '%s'\n",
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 create_default_files(const char *template_path)
173{
174 const char *git_dir = get_git_dir();
175 unsigned len = strlen(git_dir);
176 static char path[PATH_MAX];
177 struct stat st1;
178 char repo_version_string[10];
179 char junk[2];
180 int reinit;
181 int filemode;
182 if (len > sizeof(path)-50)
184 die("insane git directory %s", git_dir);
185 memcpy(path, git_dir, len);
186 if (len && path[len-1] != '/')
188 path[len++] = '/';
189 /*
191 * Create .git/refs/{heads,tags}
192 */
193 safe_create_dir(git_path("refs"), 1);
194 safe_create_dir(git_path("refs/heads"), 1);
195 safe_create_dir(git_path("refs/tags"), 1);
196 /* First copy the templates -- we might have the default
198 * config file there, in which case we would want to read
199 * from it after installing.
200 */
201 copy_templates(template_path);
202 git_config(git_default_config, NULL);
204 /*
206 * We would have created the above under user's umask -- under
207 * shared-repository settings, we would need to fix them up.
208 */
209 if (shared_repository) {
210 adjust_shared_perm(get_git_dir());
211 adjust_shared_perm(git_path("refs"));
212 adjust_shared_perm(git_path("refs/heads"));
213 adjust_shared_perm(git_path("refs/tags"));
214 }
215 /*
217 * Create the default symlink from ".git/HEAD" to the "master"
218 * branch, if it does not exist yet.
219 */
220 strcpy(path + len, "HEAD");
221 reinit = (!access(path, R_OK)
222 || readlink(path, junk, sizeof(junk)-1) != -1);
223 if (!reinit) {
224 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
225 exit(1);
226 }
227 /* This forces creation of new config file */
229 sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
230 git_config_set("core.repositoryformatversion", repo_version_string);
231 path[len] = 0;
233 strcpy(path + len, "config");
234 /* Check filemode trustability */
236 filemode = TEST_FILEMODE;
237 if (TEST_FILEMODE && !lstat(path, &st1)) {
238 struct stat st2;
239 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
240 !lstat(path, &st2) &&
241 st1.st_mode != st2.st_mode);
242 }
243 git_config_set("core.filemode", filemode ? "true" : "false");
244 if (is_bare_repository())
246 git_config_set("core.bare", "true");
247 else {
248 const char *work_tree = get_git_work_tree();
249 git_config_set("core.bare", "false");
250 /* allow template config file to override the default */
251 if (log_all_ref_updates == -1)
252 git_config_set("core.logallrefupdates", "true");
253 if (prefixcmp(git_dir, work_tree) ||
254 strcmp(git_dir + strlen(work_tree), "/.git")) {
255 git_config_set("core.worktree", work_tree);
256 }
257 }
258 if (!reinit) {
260 /* Check if symlink is supported in the work tree */
261 path[len] = 0;
262 strcpy(path + len, "tXXXXXX");
263 if (!close(xmkstemp(path)) &&
264 !unlink(path) &&
265 !symlink("testing", path) &&
266 !lstat(path, &st1) &&
267 S_ISLNK(st1.st_mode))
268 unlink(path); /* good */
269 else
270 git_config_set("core.symlinks", "false");
271 /* Check if the filesystem is case-insensitive */
273 path[len] = 0;
274 strcpy(path + len, "CoNfIg");
275 if (!access(path, F_OK))
276 git_config_set("core.ignorecase", "true");
277 }
278 return reinit;
280}
281int init_db(const char *template_dir, unsigned int flags)
283{
284 const char *sha1_dir;
285 char *path;
286 int len, reinit;
287 safe_create_dir(get_git_dir(), 0);
289 /* Check to see if the repository version is right.
291 * Note that a newly created repository does not have
292 * config file, so this will not fail. What we are catching
293 * is an attempt to reinitialize new repository with an old tool.
294 */
295 check_repository_format();
296 reinit = create_default_files(template_dir);
298 sha1_dir = get_object_directory();
300 len = strlen(sha1_dir);
301 path = xmalloc(len + 40);
302 memcpy(path, sha1_dir, len);
303 safe_create_dir(sha1_dir, 1);
305 strcpy(path+len, "/pack");
306 safe_create_dir(path, 1);
307 strcpy(path+len, "/info");
308 safe_create_dir(path, 1);
309 if (shared_repository) {
311 char buf[10];
312 /* We do not spell "group" and such, so that
313 * the configuration can be read by older version
314 * of git. Note, we use octal numbers for new share modes,
315 * and compatibility values for PERM_GROUP and
316 * PERM_EVERYBODY.
317 */
318 if (shared_repository == PERM_GROUP)
319 sprintf(buf, "%d", OLD_PERM_GROUP);
320 else if (shared_repository == PERM_EVERYBODY)
321 sprintf(buf, "%d", OLD_PERM_EVERYBODY);
322 else
323 sprintf(buf, "0%o", shared_repository);
324 git_config_set("core.sharedrepository", buf);
325 git_config_set("receive.denyNonFastforwards", "true");
326 }
327 if (!(flags & INIT_DB_QUIET))
329 printf("%s%s Git repository in %s/\n",
330 reinit ? "Reinitialized existing" : "Initialized empty",
331 shared_repository ? " shared" : "",
332 get_git_dir());
333 return 0;
335}
336static int guess_repository_type(const char *git_dir)
338{
339 char cwd[PATH_MAX];
340 const char *slash;
341 /*
343 * "GIT_DIR=. git init" is always bare.
344 * "GIT_DIR=`pwd` git init" too.
345 */
346 if (!strcmp(".", git_dir))
347 return 1;
348 if (!getcwd(cwd, sizeof(cwd)))
349 die("cannot tell cwd");
350 if (!strcmp(git_dir, cwd))
351 return 1;
352 /*
353 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
354 */
355 if (!strcmp(git_dir, ".git"))
356 return 0;
357 slash = strrchr(git_dir, '/');
358 if (slash && !strcmp(slash, "/.git"))
359 return 0;
360 /*
362 * Otherwise it is often bare. At this point
363 * we are just guessing.
364 */
365 return 1;
366}
367static const char init_db_usage[] =
369"git-init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]]";
370/*
372 * If you want to, you can share the DB area with any number of branches.
373 * That has advantages: you can save space by sharing all the SHA1 objects.
374 * On the other hand, it might just make lookup slower and messier. You
375 * be the judge. The default case is to have one DB per managed directory.
376 */
377int cmd_init_db(int argc, const char **argv, const char *prefix)
378{
379 const char *git_dir;
380 const char *template_dir = NULL;
381 unsigned int flags = 0;
382 int i;
383 for (i = 1; i < argc; i++, argv++) {
385 const char *arg = argv[1];
386 if (!prefixcmp(arg, "--template="))
387 template_dir = arg+11;
388 else if (!strcmp(arg, "--bare")) {
389 static char git_dir[PATH_MAX+1];
390 is_bare_repository_cfg = 1;
391 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir,
392 sizeof(git_dir)), 0);
393 } else if (!strcmp(arg, "--shared"))
394 shared_repository = PERM_GROUP;
395 else if (!prefixcmp(arg, "--shared="))
396 shared_repository = git_config_perm("arg", arg+9);
397 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
398 flags |= INIT_DB_QUIET;
399 else
400 usage(init_db_usage);
401 }
402 /*
404 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
405 * without --bare. Catch the error early.
406 */
407 git_dir = getenv(GIT_DIR_ENVIRONMENT);
408 if ((!git_dir || is_bare_repository_cfg == 1)
409 && getenv(GIT_WORK_TREE_ENVIRONMENT))
410 die("%s (or --work-tree=<directory>) not allowed without "
411 "specifying %s (or --git-dir=<directory>)",
412 GIT_WORK_TREE_ENVIRONMENT,
413 GIT_DIR_ENVIRONMENT);
414 /*
416 * Set up the default .git directory contents
417 */
418 if (!git_dir)
419 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
420 if (is_bare_repository_cfg < 0)
422 is_bare_repository_cfg = guess_repository_type(git_dir);
423 if (!is_bare_repository_cfg) {
425 if (git_dir) {
426 const char *git_dir_parent = strrchr(git_dir, '/');
427 if (git_dir_parent) {
428 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
429 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
430 free(rel);
431 }
432 }
433 if (!git_work_tree_cfg) {
434 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
435 if (!getcwd(git_work_tree_cfg, PATH_MAX))
436 die ("Cannot access current working directory.");
437 }
438 if (access(get_git_work_tree(), X_OK))
439 die ("Cannot access work tree '%s'",
440 get_git_work_tree());
441 }
442 set_git_dir(make_absolute_path(git_dir));
444 return init_db(template_dir, flags);
446}