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 int copy_file(const char *dst, const char *src, int mode)
33{
34 int fdi, fdo, status;
35 mode = (mode & 0111) ? 0777 : 0666;
37 if ((fdi = open(src, O_RDONLY)) < 0)
38 return fdi;
39 if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
40 close(fdi);
41 return fdo;
42 }
43 status = copy_fd(fdi, fdo);
44 if (close(fdo) != 0)
45 return error("%s: write error: %s", dst, strerror(errno));
46 if (!status && adjust_shared_perm(dst))
48 return -1;
49 return status;
51}
52static void copy_templates_1(char *path, int baselen,
54 char *template, int template_baselen,
55 DIR *dir)
56{
57 struct dirent *de;
58 /* Note: if ".git/hooks" file exists in the repository being
60 * re-initialized, /etc/core-git/templates/hooks/update would
61 * cause git-init to fail here. I think this is sane but
62 * it means that the set of templates we ship by default, along
63 * with the way the namespace under .git/ is organized, should
64 * be really carefully chosen.
65 */
66 safe_create_dir(path, 1);
67 while ((de = readdir(dir)) != NULL) {
68 struct stat st_git, st_template;
69 int namelen;
70 int exists = 0;
71 if (de->d_name[0] == '.')
73 continue;
74 namelen = strlen(de->d_name);
75 if ((PATH_MAX <= baselen + namelen) ||
76 (PATH_MAX <= template_baselen + namelen))
77 die("insanely long template name %s", de->d_name);
78 memcpy(path + baselen, de->d_name, namelen+1);
79 memcpy(template + template_baselen, de->d_name, namelen+1);
80 if (lstat(path, &st_git)) {
81 if (errno != ENOENT)
82 die("cannot stat %s", path);
83 }
84 else
85 exists = 1;
86 if (lstat(template, &st_template))
88 die("cannot stat template %s", template);
89 if (S_ISDIR(st_template.st_mode)) {
91 DIR *subdir = opendir(template);
92 int baselen_sub = baselen + namelen;
93 int template_baselen_sub = template_baselen + namelen;
94 if (!subdir)
95 die("cannot opendir %s", template);
96 path[baselen_sub++] =
97 template[template_baselen_sub++] = '/';
98 path[baselen_sub] =
99 template[template_baselen_sub] = 0;
100 copy_templates_1(path, baselen_sub,
101 template, template_baselen_sub,
102 subdir);
103 closedir(subdir);
104 }
105 else if (exists)
106 continue;
107 else if (S_ISLNK(st_template.st_mode)) {
108 char lnk[256];
109 int len;
110 len = readlink(template, lnk, sizeof(lnk));
111 if (len < 0)
112 die("cannot readlink %s", template);
113 if (sizeof(lnk) <= len)
114 die("insanely long symlink %s", template);
115 lnk[len] = 0;
116 if (symlink(lnk, path))
117 die("cannot symlink %s %s", lnk, path);
118 }
119 else if (S_ISREG(st_template.st_mode)) {
120 if (copy_file(path, template, st_template.st_mode))
121 die("cannot copy %s to %s", template, path);
122 }
123 else
124 error("ignoring template %s", template);
125 }
126}
127static void copy_templates(const char *git_dir, int len, const char *template_dir)
129{
130 char path[PATH_MAX];
131 char template_path[PATH_MAX];
132 int template_len;
133 DIR *dir;
134 if (!template_dir)
136 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
137 if (!template_dir) {
138 /*
139 * if the hard-coded template is relative, it is
140 * interpreted relative to the exec_dir
141 */
142 template_dir = DEFAULT_GIT_TEMPLATE_DIR;
143 if (!is_absolute_path(template_dir)) {
144 const char *exec_path = git_exec_path();
145 template_dir = prefix_filename(exec_path, strlen(exec_path), template_dir);
146 }
147 }
148 strcpy(template_path, template_dir);
149 template_len = strlen(template_path);
150 if (template_path[template_len-1] != '/') {
151 template_path[template_len++] = '/';
152 template_path[template_len] = 0;
153 }
154 dir = opendir(template_path);
155 if (!dir) {
156 fprintf(stderr, "warning: templates not found %s\n",
157 template_dir);
158 return;
159 }
160 /* Make sure that template is from the correct vintage */
162 strcpy(template_path + template_len, "config");
163 repository_format_version = 0;
164 git_config_from_file(check_repository_format_version,
165 template_path);
166 template_path[template_len] = 0;
167 if (repository_format_version &&
169 repository_format_version != GIT_REPO_VERSION) {
170 fprintf(stderr, "warning: not copying templates of "
171 "a wrong format version %d from '%s'\n",
172 repository_format_version,
173 template_dir);
174 closedir(dir);
175 return;
176 }
177 memcpy(path, git_dir, len);
179 path[len] = 0;
180 copy_templates_1(path, len,
181 template_path, template_len,
182 dir);
183 closedir(dir);
184}
185static int create_default_files(const char *git_dir, const char *template_path)
187{
188 unsigned len = strlen(git_dir);
189 static char path[PATH_MAX];
190 unsigned char sha1[20];
191 struct stat st1;
192 char repo_version_string[10];
193 int reinit;
194 int filemode;
195 if (len > sizeof(path)-50)
197 die("insane git directory %s", git_dir);
198 memcpy(path, git_dir, len);
199 if (len && path[len-1] != '/')
201 path[len++] = '/';
202 /*
204 * Create .git/refs/{heads,tags}
205 */
206 strcpy(path + len, "refs");
207 safe_create_dir(path, 1);
208 strcpy(path + len, "refs/heads");
209 safe_create_dir(path, 1);
210 strcpy(path + len, "refs/tags");
211 safe_create_dir(path, 1);
212 /* First copy the templates -- we might have the default
214 * config file there, in which case we would want to read
215 * from it after installing.
216 */
217 path[len] = 0;
218 copy_templates(path, len, template_path);
219 git_config(git_default_config);
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 path[len] = 0;
228 adjust_shared_perm(path);
229 strcpy(path + len, "refs");
230 adjust_shared_perm(path);
231 strcpy(path + len, "refs/heads");
232 adjust_shared_perm(path);
233 strcpy(path + len, "refs/tags");
234 adjust_shared_perm(path);
235 }
236 /*
238 * Create the default symlink from ".git/HEAD" to the "master"
239 * branch, if it does not exist yet.
240 */
241 strcpy(path + len, "HEAD");
242 reinit = !read_ref("HEAD", sha1);
243 if (!reinit) {
244 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
245 exit(1);
246 }
247 /* This forces creation of new config file */
249 sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
250 git_config_set("core.repositoryformatversion", repo_version_string);
251 path[len] = 0;
253 strcpy(path + len, "config");
254 /* Check filemode trustability */
256 filemode = TEST_FILEMODE;
257 if (TEST_FILEMODE && !lstat(path, &st1)) {
258 struct stat st2;
259 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
260 !lstat(path, &st2) &&
261 st1.st_mode != st2.st_mode);
262 }
263 git_config_set("core.filemode", filemode ? "true" : "false");
264 if (is_bare_repository())
266 git_config_set("core.bare", "true");
267 else {
268 const char *work_tree = get_git_work_tree();
269 git_config_set("core.bare", "false");
270 /* allow template config file to override the default */
271 if (log_all_ref_updates == -1)
272 git_config_set("core.logallrefupdates", "true");
273 if (work_tree != git_work_tree_cfg)
274 git_config_set("core.worktree", work_tree);
275 }
276 /* Check if symlink is supported in the work tree */
278 if (!reinit) {
279 path[len] = 0;
280 strcpy(path + len, "tXXXXXX");
281 if (!close(xmkstemp(path)) &&
282 !unlink(path) &&
283 !symlink("testing", path) &&
284 !lstat(path, &st1) &&
285 S_ISLNK(st1.st_mode))
286 unlink(path); /* good */
287 else
288 git_config_set("core.symlinks", "false");
289 }
290 return reinit;
292}
293static void guess_repository_type(const char *git_dir)
295{
296 char cwd[PATH_MAX];
297 const char *slash;
298 if (0 <= is_bare_repository_cfg)
300 return;
301 if (!git_dir)
302 return;
303 /*
305 * "GIT_DIR=. git init" is always bare.
306 * "GIT_DIR=`pwd` git init" too.
307 */
308 if (!strcmp(".", git_dir))
309 goto force_bare;
310 if (!getcwd(cwd, sizeof(cwd)))
311 die("cannot tell cwd");
312 if (!strcmp(git_dir, cwd))
313 goto force_bare;
314 /*
315 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
316 */
317 if (!strcmp(git_dir, ".git"))
318 return;
319 slash = strrchr(git_dir, '/');
320 if (slash && !strcmp(slash, "/.git"))
321 return;
322 /*
324 * Otherwise it is often bare. At this point
325 * we are just guessing.
326 */
327 force_bare:
328 is_bare_repository_cfg = 1;
329 return;
330}
331static const char init_db_usage[] =
333"git-init [-q | --quiet] [--template=<template-directory>] [--shared]";
334/*
336 * If you want to, you can share the DB area with any number of branches.
337 * That has advantages: you can save space by sharing all the SHA1 objects.
338 * On the other hand, it might just make lookup slower and messier. You
339 * be the judge. The default case is to have one DB per managed directory.
340 */
341int cmd_init_db(int argc, const char **argv, const char *prefix)
342{
343 const char *git_dir;
344 const char *sha1_dir;
345 const char *template_dir = NULL;
346 char *path;
347 int len, i, reinit;
348 int quiet = 0;
349 for (i = 1; i < argc; i++, argv++) {
351 const char *arg = argv[1];
352 if (!prefixcmp(arg, "--template="))
353 template_dir = arg+11;
354 else if (!strcmp(arg, "--shared"))
355 shared_repository = PERM_GROUP;
356 else if (!prefixcmp(arg, "--shared="))
357 shared_repository = git_config_perm("arg", arg+9);
358 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
359 quiet = 1;
360 else
361 usage(init_db_usage);
362 }
363 /*
365 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
366 * without --bare. Catch the error early.
367 */
368 git_dir = getenv(GIT_DIR_ENVIRONMENT);
369 if ((!git_dir || is_bare_repository_cfg == 1)
370 && getenv(GIT_WORK_TREE_ENVIRONMENT))
371 die("%s (or --work-tree=<directory>) not allowed without "
372 "specifying %s (or --git-dir=<directory>)",
373 GIT_WORK_TREE_ENVIRONMENT,
374 GIT_DIR_ENVIRONMENT);
375 guess_repository_type(git_dir);
377 if (is_bare_repository_cfg <= 0) {
379 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
380 if (!getcwd(git_work_tree_cfg, PATH_MAX))
381 die ("Cannot access current working directory.");
382 if (access(get_git_work_tree(), X_OK))
383 die ("Cannot access work tree '%s'",
384 get_git_work_tree());
385 }
386 /*
388 * Set up the default .git directory contents
389 */
390 git_dir = getenv(GIT_DIR_ENVIRONMENT);
391 if (!git_dir)
392 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
393 safe_create_dir(git_dir, 0);
394 /* Check to see if the repository version is right.
396 * Note that a newly created repository does not have
397 * config file, so this will not fail. What we are catching
398 * is an attempt to reinitialize new repository with an old tool.
399 */
400 check_repository_format();
401 reinit = create_default_files(git_dir, template_dir);
403 /*
405 * And set up the object store.
406 */
407 sha1_dir = get_object_directory();
408 len = strlen(sha1_dir);
409 path = xmalloc(len + 40);
410 memcpy(path, sha1_dir, len);
411 safe_create_dir(sha1_dir, 1);
413 strcpy(path+len, "/pack");
414 safe_create_dir(path, 1);
415 strcpy(path+len, "/info");
416 safe_create_dir(path, 1);
417 if (shared_repository) {
419 char buf[10];
420 /* We do not spell "group" and such, so that
421 * the configuration can be read by older version
422 * of git.
423 */
424 sprintf(buf, "%d", shared_repository);
425 git_config_set("core.sharedrepository", buf);
426 git_config_set("receive.denyNonFastforwards", "true");
427 }
428 if (!quiet)
430 printf("%s%s Git repository in %s/\n",
431 reinit ? "Reinitialized existing" : "Initialized empty",
432 shared_repository ? " shared" : "",
433 git_dir);
434 return 0;
436}