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#ifndef DEFAULT_GIT_TEMPLATE_DIR
10#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates/"
11#endif
12#ifdef NO_TRUSTABLE_FILEMODE
14#define TEST_FILEMODE 0
15#else
16#define TEST_FILEMODE 1
17#endif
18static void safe_create_dir(const char *dir, int share)
20{
21 if (mkdir(dir, 0777) < 0) {
22 if (errno != EEXIST) {
23 perror(dir);
24 exit(1);
25 }
26 }
27 else if (share && adjust_shared_perm(dir))
28 die("Could not make %s writable by group\n", dir);
29}
30static int copy_file(const char *dst, const char *src, int mode)
32{
33 int fdi, fdo, status;
34 mode = (mode & 0111) ? 0777 : 0666;
36 if ((fdi = open(src, O_RDONLY)) < 0)
37 return fdi;
38 if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
39 close(fdi);
40 return fdo;
41 }
42 status = copy_fd(fdi, fdo);
43 close(fdo);
44 if (!status && adjust_shared_perm(dst))
46 return -1;
47 return status;
49}
50static void copy_templates_1(char *path, int baselen,
52 char *template, int template_baselen,
53 DIR *dir)
54{
55 struct dirent *de;
56 /* Note: if ".git/hooks" file exists in the repository being
58 * re-initialized, /etc/core-git/templates/hooks/update would
59 * cause git-init-db to fail here. I think this is sane but
60 * it means that the set of templates we ship by default, along
61 * with the way the namespace under .git/ is organized, should
62 * be really carefully chosen.
63 */
64 safe_create_dir(path, 1);
65 while ((de = readdir(dir)) != NULL) {
66 struct stat st_git, st_template;
67 int namelen;
68 int exists = 0;
69 if (de->d_name[0] == '.')
71 continue;
72 namelen = strlen(de->d_name);
73 if ((PATH_MAX <= baselen + namelen) ||
74 (PATH_MAX <= template_baselen + namelen))
75 die("insanely long template name %s", de->d_name);
76 memcpy(path + baselen, de->d_name, namelen+1);
77 memcpy(template + template_baselen, de->d_name, namelen+1);
78 if (lstat(path, &st_git)) {
79 if (errno != ENOENT)
80 die("cannot stat %s", path);
81 }
82 else
83 exists = 1;
84 if (lstat(template, &st_template))
86 die("cannot stat template %s", template);
87 if (S_ISDIR(st_template.st_mode)) {
89 DIR *subdir = opendir(template);
90 int baselen_sub = baselen + namelen;
91 int template_baselen_sub = template_baselen + namelen;
92 if (!subdir)
93 die("cannot opendir %s", template);
94 path[baselen_sub++] =
95 template[template_baselen_sub++] = '/';
96 path[baselen_sub] =
97 template[template_baselen_sub] = 0;
98 copy_templates_1(path, baselen_sub,
99 template, template_baselen_sub,
100 subdir);
101 closedir(subdir);
102 }
103 else if (exists)
104 continue;
105 else if (S_ISLNK(st_template.st_mode)) {
106 char lnk[256];
107 int len;
108 len = readlink(template, lnk, sizeof(lnk));
109 if (len < 0)
110 die("cannot readlink %s", template);
111 if (sizeof(lnk) <= len)
112 die("insanely long symlink %s", template);
113 lnk[len] = 0;
114 if (symlink(lnk, path))
115 die("cannot symlink %s %s", lnk, path);
116 }
117 else if (S_ISREG(st_template.st_mode)) {
118 if (copy_file(path, template, st_template.st_mode))
119 die("cannot copy %s to %s", template, path);
120 }
121 else
122 error("ignoring template %s", template);
123 }
124}
125static void copy_templates(const char *git_dir, int len, const char *template_dir)
127{
128 char path[PATH_MAX];
129 char template_path[PATH_MAX];
130 int template_len;
131 DIR *dir;
132 if (!template_dir) {
134 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
135 if (!template_dir)
136 template_dir = DEFAULT_GIT_TEMPLATE_DIR;
137 }
138 strcpy(template_path, template_dir);
139 template_len = strlen(template_path);
140 if (template_path[template_len-1] != '/') {
141 template_path[template_len++] = '/';
142 template_path[template_len] = 0;
143 }
144 dir = opendir(template_path);
145 if (!dir) {
146 fprintf(stderr, "warning: templates not found %s\n",
147 template_dir);
148 return;
149 }
150 /* Make sure that template is from the correct vintage */
152 strcpy(template_path + template_len, "config");
153 repository_format_version = 0;
154 git_config_from_file(check_repository_format_version,
155 template_path);
156 template_path[template_len] = 0;
157 if (repository_format_version &&
159 repository_format_version != GIT_REPO_VERSION) {
160 fprintf(stderr, "warning: not copying templates of "
161 "a wrong format version %d from '%s'\n",
162 repository_format_version,
163 template_dir);
164 closedir(dir);
165 return;
166 }
167 memcpy(path, git_dir, len);
169 path[len] = 0;
170 copy_templates_1(path, len,
171 template_path, template_len,
172 dir);
173 closedir(dir);
174}
175static int create_default_files(const char *git_dir, const char *template_path)
177{
178 unsigned len = strlen(git_dir);
179 static char path[PATH_MAX];
180 unsigned char sha1[20];
181 struct stat st1;
182 char repo_version_string[10];
183 int reinit;
184 int filemode;
185 if (len > sizeof(path)-50)
187 die("insane git directory %s", git_dir);
188 memcpy(path, git_dir, len);
189 if (len && path[len-1] != '/')
191 path[len++] = '/';
192 /*
194 * Create .git/refs/{heads,tags}
195 */
196 strcpy(path + len, "refs");
197 safe_create_dir(path, 1);
198 strcpy(path + len, "refs/heads");
199 safe_create_dir(path, 1);
200 strcpy(path + len, "refs/tags");
201 safe_create_dir(path, 1);
202 /* First copy the templates -- we might have the default
204 * config file there, in which case we would want to read
205 * from it after installing.
206 */
207 path[len] = 0;
208 copy_templates(path, len, template_path);
209 git_config(git_default_config);
211 /*
213 * We would have created the above under user's umask -- under
214 * shared-repository settings, we would need to fix them up.
215 */
216 if (shared_repository) {
217 path[len] = 0;
218 adjust_shared_perm(path);
219 strcpy(path + len, "refs");
220 adjust_shared_perm(path);
221 strcpy(path + len, "refs/heads");
222 adjust_shared_perm(path);
223 strcpy(path + len, "refs/tags");
224 adjust_shared_perm(path);
225 }
226 /*
228 * Create the default symlink from ".git/HEAD" to the "master"
229 * branch, if it does not exist yet.
230 */
231 strcpy(path + len, "HEAD");
232 reinit = !read_ref("HEAD", sha1);
233 if (!reinit) {
234 if (create_symref("HEAD", "refs/heads/master") < 0)
235 exit(1);
236 }
237 /* This forces creation of new config file */
239 sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
240 git_config_set("core.repositoryformatversion", repo_version_string);
241 path[len] = 0;
243 strcpy(path + len, "config");
244 /* Check filemode trustability */
246 filemode = TEST_FILEMODE;
247 if (TEST_FILEMODE && !lstat(path, &st1)) {
248 struct stat st2;
249 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
250 !lstat(path, &st2) &&
251 st1.st_mode != st2.st_mode);
252 }
253 git_config_set("core.filemode", filemode ? "true" : "false");
254 /* Enable logAllRefUpdates if a working tree is attached */
256 if (!is_bare_git_dir(git_dir))
257 git_config_set("core.logallrefupdates", "true");
258 return reinit;
259}
260static const char init_db_usage[] =
262"git-init [--template=<template-directory>] [--shared]";
263/*
265 * If you want to, you can share the DB area with any number of branches.
266 * That has advantages: you can save space by sharing all the SHA1 objects.
267 * On the other hand, it might just make lookup slower and messier. You
268 * be the judge. The default case is to have one DB per managed directory.
269 */
270int cmd_init_db(int argc, const char **argv, const char *prefix)
271{
272 const char *git_dir;
273 const char *sha1_dir;
274 const char *template_dir = NULL;
275 char *path;
276 int len, i, reinit;
277 for (i = 1; i < argc; i++, argv++) {
279 const char *arg = argv[1];
280 if (!strncmp(arg, "--template=", 11))
281 template_dir = arg+11;
282 else if (!strcmp(arg, "--shared"))
283 shared_repository = PERM_GROUP;
284 else if (!strncmp(arg, "--shared=", 9))
285 shared_repository = git_config_perm("arg", arg+9);
286 else
287 usage(init_db_usage);
288 }
289 /*
291 * Set up the default .git directory contents
292 */
293 git_dir = getenv(GIT_DIR_ENVIRONMENT);
294 if (!git_dir)
295 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
296 safe_create_dir(git_dir, 0);
297 /* Check to see if the repository version is right.
299 * Note that a newly created repository does not have
300 * config file, so this will not fail. What we are catching
301 * is an attempt to reinitialize new repository with an old tool.
302 */
303 check_repository_format();
304 reinit = create_default_files(git_dir, template_dir);
306 /*
308 * And set up the object store.
309 */
310 sha1_dir = get_object_directory();
311 len = strlen(sha1_dir);
312 path = xmalloc(len + 40);
313 memcpy(path, sha1_dir, len);
314 safe_create_dir(sha1_dir, 1);
316 strcpy(path+len, "/pack");
317 safe_create_dir(path, 1);
318 strcpy(path+len, "/info");
319 safe_create_dir(path, 1);
320 if (shared_repository) {
322 char buf[10];
323 /* We do not spell "group" and such, so that
324 * the configuration can be read by older version
325 * of git.
326 */
327 sprintf(buf, "%d", shared_repository);
328 git_config_set("core.sharedrepository", buf);
329 git_config_set("receive.denyNonFastforwards", "true");
330 }
331 printf("%s%s Git repository in %s/\n",
333 reinit ? "Reinitialized existing" : "Initialized empty",
334 shared_repository ? " shared" : "",
335 git_dir);
336 return 0;
338}