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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 | ||
10 | #ifndef DEFAULT_GIT_TEMPLATE_DIR | |
11 | #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates" | |
12 | #endif | |
13 | ||
14 | #ifdef NO_TRUSTABLE_FILEMODE | |
15 | #define TEST_FILEMODE 0 | |
16 | #else | |
17 | #define TEST_FILEMODE 1 | |
18 | #endif | |
19 | ||
20 | static int init_is_bare_repository = 0; | |
21 | static int init_shared_repository = -1; | |
22 | ||
23 | static 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\n", dir); | |
33 | } | |
34 | ||
35 | static void copy_templates_1(char *path, int baselen, | |
36 | char *template, int template_baselen, | |
37 | DIR *dir) | |
38 | { | |
39 | struct dirent *de; | |
40 | ||
41 | /* 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 | ||
54 | 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 | ||
69 | if (lstat(template, &st_template)) | |
70 | die("cannot stat template %s", template); | |
71 | ||
72 | 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 | } | |
109 | ||
110 | static 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 | ||
119 | 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 | fprintf(stderr, "warning: templates not found %s\n", | |
136 | template_dir); | |
137 | return; | |
138 | } | |
139 | ||
140 | /* Make sure that template is from the correct vintage */ | |
141 | strcpy(template_path + template_len, "config"); | |
142 | repository_format_version = 0; | |
143 | git_config_from_file(check_repository_format_version, | |
144 | template_path, NULL); | |
145 | template_path[template_len] = 0; | |
146 | ||
147 | if (repository_format_version && | |
148 | repository_format_version != GIT_REPO_VERSION) { | |
149 | fprintf(stderr, "warning: not copying templates of " | |
150 | "a wrong format version %d from '%s'\n", | |
151 | repository_format_version, | |
152 | template_dir); | |
153 | closedir(dir); | |
154 | return; | |
155 | } | |
156 | ||
157 | memcpy(path, git_dir, len); | |
158 | if (len && path[len - 1] != '/') | |
159 | path[len++] = '/'; | |
160 | path[len] = 0; | |
161 | copy_templates_1(path, len, | |
162 | template_path, template_len, | |
163 | dir); | |
164 | closedir(dir); | |
165 | } | |
166 | ||
167 | static int create_default_files(const char *template_path) | |
168 | { | |
169 | const char *git_dir = get_git_dir(); | |
170 | unsigned len = strlen(git_dir); | |
171 | static char path[PATH_MAX]; | |
172 | struct stat st1; | |
173 | char repo_version_string[10]; | |
174 | char junk[2]; | |
175 | int reinit; | |
176 | int filemode; | |
177 | ||
178 | if (len > sizeof(path)-50) | |
179 | die("insane git directory %s", git_dir); | |
180 | memcpy(path, git_dir, len); | |
181 | ||
182 | if (len && path[len-1] != '/') | |
183 | path[len++] = '/'; | |
184 | ||
185 | /* | |
186 | * Create .git/refs/{heads,tags} | |
187 | */ | |
188 | safe_create_dir(git_path("refs"), 1); | |
189 | safe_create_dir(git_path("refs/heads"), 1); | |
190 | safe_create_dir(git_path("refs/tags"), 1); | |
191 | ||
192 | /* First copy the templates -- we might have the default | |
193 | * config file there, in which case we would want to read | |
194 | * from it after installing. | |
195 | */ | |
196 | copy_templates(template_path); | |
197 | ||
198 | git_config(git_default_config, NULL); | |
199 | is_bare_repository_cfg = init_is_bare_repository; | |
200 | if (init_shared_repository != -1) | |
201 | shared_repository = init_shared_repository; | |
202 | ||
203 | /* | |
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 | ||
214 | /* | |
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 | ||
226 | /* 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 | ||
230 | path[len] = 0; | |
231 | strcpy(path + len, "config"); | |
232 | ||
233 | /* 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 | ||
243 | 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 | ||
257 | 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 | ||
270 | /* 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 | ||
277 | return reinit; | |
278 | } | |
279 | ||
280 | int init_db(const char *template_dir, unsigned int flags) | |
281 | { | |
282 | const char *sha1_dir; | |
283 | char *path; | |
284 | int len, reinit; | |
285 | ||
286 | safe_create_dir(get_git_dir(), 0); | |
287 | ||
288 | init_is_bare_repository = is_bare_repository(); | |
289 | ||
290 | /* 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 | ||
297 | reinit = create_default_files(template_dir); | |
298 | ||
299 | sha1_dir = get_object_directory(); | |
300 | len = strlen(sha1_dir); | |
301 | path = xmalloc(len + 40); | |
302 | memcpy(path, sha1_dir, len); | |
303 | ||
304 | 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 | ||
310 | 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 | ||
328 | 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 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static int guess_repository_type(const char *git_dir) | |
338 | { | |
339 | char cwd[PATH_MAX]; | |
340 | const char *slash; | |
341 | ||
342 | /* | |
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 | ||
361 | /* | |
362 | * Otherwise it is often bare. At this point | |
363 | * we are just guessing. | |
364 | */ | |
365 | return 1; | |
366 | } | |
367 | ||
368 | static const char init_db_usage[] = | |
369 | "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]]"; | |
370 | ||
371 | /* | |
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 | */ | |
377 | int 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 | ||
384 | 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 | init_shared_repository = PERM_GROUP; | |
395 | else if (!prefixcmp(arg, "--shared=")) | |
396 | init_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 | ||
403 | /* | |
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 | ||
415 | /* | |
416 | * Set up the default .git directory contents | |
417 | */ | |
418 | if (!git_dir) | |
419 | git_dir = DEFAULT_GIT_DIR_ENVIRONMENT; | |
420 | ||
421 | if (is_bare_repository_cfg < 0) | |
422 | is_bare_repository_cfg = guess_repository_type(git_dir); | |
423 | ||
424 | 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 | ||
443 | set_git_dir(make_absolute_path(git_dir)); | |
444 | ||
445 | return init_db(template_dir, flags); | |
446 | } |