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 *git_dir, int len, const char *template_dir)
108{
109 char path[PATH_MAX];
110 char template_path[PATH_MAX];
111 int template_len;
112 DIR *dir;
113 if (!template_dir)
115 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
116 if (!template_dir) {
117 /*
118 * if the hard-coded template is relative, it is
119 * interpreted relative to the exec_dir
120 */
121 template_dir = DEFAULT_GIT_TEMPLATE_DIR;
122 if (!is_absolute_path(template_dir)) {
123 struct strbuf d = STRBUF_INIT;
124 strbuf_addf(&d, "%s/%s", git_exec_path(), template_dir);
125 template_dir = strbuf_detach(&d, NULL);
126 }
127 }
128 strcpy(template_path, template_dir);
129 template_len = strlen(template_path);
130 if (template_path[template_len-1] != '/') {
131 template_path[template_len++] = '/';
132 template_path[template_len] = 0;
133 }
134 dir = opendir(template_path);
135 if (!dir) {
136 fprintf(stderr, "warning: templates not found %s\n",
137 template_dir);
138 return;
139 }
140 /* Make sure that template is from the correct vintage */
142 strcpy(template_path + template_len, "config");
143 repository_format_version = 0;
144 git_config_from_file(check_repository_format_version,
145 template_path);
146 template_path[template_len] = 0;
147 if (repository_format_version &&
149 repository_format_version != GIT_REPO_VERSION) {
150 fprintf(stderr, "warning: not copying templates of "
151 "a wrong format version %d from '%s'\n",
152 repository_format_version,
153 template_dir);
154 closedir(dir);
155 return;
156 }
157 memcpy(path, git_dir, 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 *git_dir, const char *template_path)
167{
168 unsigned len = strlen(git_dir);
169 static char path[PATH_MAX];
170 struct stat st1;
171 char repo_version_string[10];
172 char junk[2];
173 int reinit;
174 int filemode;
175 if (len > sizeof(path)-50)
177 die("insane git directory %s", git_dir);
178 memcpy(path, git_dir, len);
179 if (len && path[len-1] != '/')
181 path[len++] = '/';
182 /*
184 * Create .git/refs/{heads,tags}
185 */
186 strcpy(path + len, "refs");
187 safe_create_dir(path, 1);
188 strcpy(path + len, "refs/heads");
189 safe_create_dir(path, 1);
190 strcpy(path + len, "refs/tags");
191 safe_create_dir(path, 1);
192 /* First copy the templates -- we might have the default
194 * config file there, in which case we would want to read
195 * from it after installing.
196 */
197 path[len] = 0;
198 copy_templates(path, len, template_path);
199 git_config(git_default_config);
201 /*
203 * We would have created the above under user's umask -- under
204 * shared-repository settings, we would need to fix them up.
205 */
206 if (shared_repository) {
207 path[len] = 0;
208 adjust_shared_perm(path);
209 strcpy(path + len, "refs");
210 adjust_shared_perm(path);
211 strcpy(path + len, "refs/heads");
212 adjust_shared_perm(path);
213 strcpy(path + len, "refs/tags");
214 adjust_shared_perm(path);
215 }
216 /*
218 * Create the default symlink from ".git/HEAD" to the "master"
219 * branch, if it does not exist yet.
220 */
221 strcpy(path + len, "HEAD");
222 reinit = (!access(path, R_OK)
223 || readlink(path, junk, sizeof(junk)-1) != -1);
224 if (!reinit) {
225 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
226 exit(1);
227 }
228 /* This forces creation of new config file */
230 sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
231 git_config_set("core.repositoryformatversion", repo_version_string);
232 path[len] = 0;
234 strcpy(path + len, "config");
235 /* Check filemode trustability */
237 filemode = TEST_FILEMODE;
238 if (TEST_FILEMODE && !lstat(path, &st1)) {
239 struct stat st2;
240 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
241 !lstat(path, &st2) &&
242 st1.st_mode != st2.st_mode);
243 }
244 git_config_set("core.filemode", filemode ? "true" : "false");
245 if (is_bare_repository())
247 git_config_set("core.bare", "true");
248 else {
249 const char *work_tree = get_git_work_tree();
250 git_config_set("core.bare", "false");
251 /* allow template config file to override the default */
252 if (log_all_ref_updates == -1)
253 git_config_set("core.logallrefupdates", "true");
254 if (work_tree != git_work_tree_cfg)
255 git_config_set("core.worktree", work_tree);
256 }
257 /* Check if symlink is supported in the work tree */
259 if (!reinit) {
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 }
271 return reinit;
273}
274static void guess_repository_type(const char *git_dir)
276{
277 char cwd[PATH_MAX];
278 const char *slash;
279 if (0 <= is_bare_repository_cfg)
281 return;
282 if (!git_dir)
283 return;
284 /*
286 * "GIT_DIR=. git init" is always bare.
287 * "GIT_DIR=`pwd` git init" too.
288 */
289 if (!strcmp(".", git_dir))
290 goto force_bare;
291 if (!getcwd(cwd, sizeof(cwd)))
292 die("cannot tell cwd");
293 if (!strcmp(git_dir, cwd))
294 goto force_bare;
295 /*
296 * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
297 */
298 if (!strcmp(git_dir, ".git"))
299 return;
300 slash = strrchr(git_dir, '/');
301 if (slash && !strcmp(slash, "/.git"))
302 return;
303 /*
305 * Otherwise it is often bare. At this point
306 * we are just guessing.
307 */
308 force_bare:
309 is_bare_repository_cfg = 1;
310 return;
311}
312static const char init_db_usage[] =
314"git-init [-q | --quiet] [--template=<template-directory>] [--shared]";
315/*
317 * If you want to, you can share the DB area with any number of branches.
318 * That has advantages: you can save space by sharing all the SHA1 objects.
319 * On the other hand, it might just make lookup slower and messier. You
320 * be the judge. The default case is to have one DB per managed directory.
321 */
322int cmd_init_db(int argc, const char **argv, const char *prefix)
323{
324 const char *git_dir;
325 const char *sha1_dir;
326 const char *template_dir = NULL;
327 char *path;
328 int len, i, reinit;
329 int quiet = 0;
330 for (i = 1; i < argc; i++, argv++) {
332 const char *arg = argv[1];
333 if (!prefixcmp(arg, "--template="))
334 template_dir = arg+11;
335 else if (!strcmp(arg, "--shared"))
336 shared_repository = PERM_GROUP;
337 else if (!prefixcmp(arg, "--shared="))
338 shared_repository = git_config_perm("arg", arg+9);
339 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
340 quiet = 1;
341 else
342 usage(init_db_usage);
343 }
344 /*
346 * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
347 * without --bare. Catch the error early.
348 */
349 git_dir = getenv(GIT_DIR_ENVIRONMENT);
350 if ((!git_dir || is_bare_repository_cfg == 1)
351 && getenv(GIT_WORK_TREE_ENVIRONMENT))
352 die("%s (or --work-tree=<directory>) not allowed without "
353 "specifying %s (or --git-dir=<directory>)",
354 GIT_WORK_TREE_ENVIRONMENT,
355 GIT_DIR_ENVIRONMENT);
356 guess_repository_type(git_dir);
358 if (is_bare_repository_cfg <= 0) {
360 git_work_tree_cfg = xcalloc(PATH_MAX, 1);
361 if (!getcwd(git_work_tree_cfg, PATH_MAX))
362 die ("Cannot access current working directory.");
363 if (access(get_git_work_tree(), X_OK))
364 die ("Cannot access work tree '%s'",
365 get_git_work_tree());
366 }
367 /*
369 * Set up the default .git directory contents
370 */
371 git_dir = getenv(GIT_DIR_ENVIRONMENT);
372 if (!git_dir)
373 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
374 safe_create_dir(git_dir, 0);
375 /* Check to see if the repository version is right.
377 * Note that a newly created repository does not have
378 * config file, so this will not fail. What we are catching
379 * is an attempt to reinitialize new repository with an old tool.
380 */
381 check_repository_format();
382 reinit = create_default_files(git_dir, template_dir);
384 /*
386 * And set up the object store.
387 */
388 sha1_dir = get_object_directory();
389 len = strlen(sha1_dir);
390 path = xmalloc(len + 40);
391 memcpy(path, sha1_dir, len);
392 safe_create_dir(sha1_dir, 1);
394 strcpy(path+len, "/pack");
395 safe_create_dir(path, 1);
396 strcpy(path+len, "/info");
397 safe_create_dir(path, 1);
398 if (shared_repository) {
400 char buf[10];
401 /* We do not spell "group" and such, so that
402 * the configuration can be read by older version
403 * of git. Note, we use octal numbers for new share modes,
404 * and compatibility values for PERM_GROUP and
405 * PERM_EVERYBODY.
406 */
407 if (shared_repository == PERM_GROUP)
408 sprintf(buf, "%d", OLD_PERM_GROUP);
409 else if (shared_repository == PERM_EVERYBODY)
410 sprintf(buf, "%d", OLD_PERM_EVERYBODY);
411 else
412 sprintf(buf, "0%o", shared_repository);
413 git_config_set("core.sharedrepository", buf);
414 git_config_set("receive.denyNonFastforwards", "true");
415 }
416 if (!quiet)
418 printf("%s%s Git repository in %s/\n",
419 reinit ? "Reinitialized existing" : "Initialized empty",
420 shared_repository ? " shared" : "",
421 git_dir);
422 return 0;
424}