shared repository: optionally allow reading to "others".
[git/git.git] / builtin-init-db.c
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
9 #ifndef DEFAULT_GIT_TEMPLATE_DIR
10 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates/"
11 #endif
12
13 static void safe_create_dir(const char *dir, int share)
14 {
15 if (mkdir(dir, 0777) < 0) {
16 if (errno != EEXIST) {
17 perror(dir);
18 exit(1);
19 }
20 }
21 else if (share && adjust_shared_perm(dir))
22 die("Could not make %s writable by group\n", dir);
23 }
24
25 static int copy_file(const char *dst, const char *src, int mode)
26 {
27 int fdi, fdo, status;
28
29 mode = (mode & 0111) ? 0777 : 0666;
30 if ((fdi = open(src, O_RDONLY)) < 0)
31 return fdi;
32 if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
33 close(fdi);
34 return fdo;
35 }
36 status = copy_fd(fdi, fdo);
37 close(fdo);
38
39 if (!status && adjust_shared_perm(dst))
40 return -1;
41
42 return status;
43 }
44
45 static void copy_templates_1(char *path, int baselen,
46 char *template, int template_baselen,
47 DIR *dir)
48 {
49 struct dirent *de;
50
51 /* Note: if ".git/hooks" file exists in the repository being
52 * re-initialized, /etc/core-git/templates/hooks/update would
53 * cause git-init-db to fail here. I think this is sane but
54 * it means that the set of templates we ship by default, along
55 * with the way the namespace under .git/ is organized, should
56 * be really carefully chosen.
57 */
58 safe_create_dir(path, 1);
59 while ((de = readdir(dir)) != NULL) {
60 struct stat st_git, st_template;
61 int namelen;
62 int exists = 0;
63
64 if (de->d_name[0] == '.')
65 continue;
66 namelen = strlen(de->d_name);
67 if ((PATH_MAX <= baselen + namelen) ||
68 (PATH_MAX <= template_baselen + namelen))
69 die("insanely long template name %s", de->d_name);
70 memcpy(path + baselen, de->d_name, namelen+1);
71 memcpy(template + template_baselen, de->d_name, namelen+1);
72 if (lstat(path, &st_git)) {
73 if (errno != ENOENT)
74 die("cannot stat %s", path);
75 }
76 else
77 exists = 1;
78
79 if (lstat(template, &st_template))
80 die("cannot stat template %s", template);
81
82 if (S_ISDIR(st_template.st_mode)) {
83 DIR *subdir = opendir(template);
84 int baselen_sub = baselen + namelen;
85 int template_baselen_sub = template_baselen + namelen;
86 if (!subdir)
87 die("cannot opendir %s", template);
88 path[baselen_sub++] =
89 template[template_baselen_sub++] = '/';
90 path[baselen_sub] =
91 template[template_baselen_sub] = 0;
92 copy_templates_1(path, baselen_sub,
93 template, template_baselen_sub,
94 subdir);
95 closedir(subdir);
96 }
97 else if (exists)
98 continue;
99 else if (S_ISLNK(st_template.st_mode)) {
100 char lnk[256];
101 int len;
102 len = readlink(template, lnk, sizeof(lnk));
103 if (len < 0)
104 die("cannot readlink %s", template);
105 if (sizeof(lnk) <= len)
106 die("insanely long symlink %s", template);
107 lnk[len] = 0;
108 if (symlink(lnk, path))
109 die("cannot symlink %s %s", lnk, path);
110 }
111 else if (S_ISREG(st_template.st_mode)) {
112 if (copy_file(path, template, st_template.st_mode))
113 die("cannot copy %s to %s", template, path);
114 }
115 else
116 error("ignoring template %s", template);
117 }
118 }
119
120 static void copy_templates(const char *git_dir, int len, const char *template_dir)
121 {
122 char path[PATH_MAX];
123 char template_path[PATH_MAX];
124 int template_len;
125 DIR *dir;
126
127 if (!template_dir)
128 template_dir = DEFAULT_GIT_TEMPLATE_DIR;
129 strcpy(template_path, template_dir);
130 template_len = strlen(template_path);
131 if (template_path[template_len-1] != '/') {
132 template_path[template_len++] = '/';
133 template_path[template_len] = 0;
134 }
135 dir = opendir(template_path);
136 if (!dir) {
137 fprintf(stderr, "warning: templates not found %s\n",
138 template_dir);
139 return;
140 }
141
142 /* Make sure that template is from the correct vintage */
143 strcpy(template_path + template_len, "config");
144 repository_format_version = 0;
145 git_config_from_file(check_repository_format_version,
146 template_path);
147 template_path[template_len] = 0;
148
149 if (repository_format_version &&
150 repository_format_version != GIT_REPO_VERSION) {
151 fprintf(stderr, "warning: not copying templates of "
152 "a wrong format version %d from '%s'\n",
153 repository_format_version,
154 template_dir);
155 closedir(dir);
156 return;
157 }
158
159 memcpy(path, git_dir, 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 void create_default_files(const char *git_dir, const char *template_path)
168 {
169 unsigned len = strlen(git_dir);
170 static char path[PATH_MAX];
171 unsigned char sha1[20];
172 struct stat st1;
173 char repo_version_string[10];
174
175 if (len > sizeof(path)-50)
176 die("insane git directory %s", git_dir);
177 memcpy(path, git_dir, len);
178
179 if (len && path[len-1] != '/')
180 path[len++] = '/';
181
182 /*
183 * Create .git/refs/{heads,tags}
184 */
185 strcpy(path + len, "refs");
186 safe_create_dir(path, 1);
187 strcpy(path + len, "refs/heads");
188 safe_create_dir(path, 1);
189 strcpy(path + len, "refs/tags");
190 safe_create_dir(path, 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 path[len] = 0;
197 copy_templates(path, len, template_path);
198
199 git_config(git_default_config);
200
201 /*
202 * We would have created the above under user's umask -- under
203 * shared-repository settings, we would need to fix them up.
204 */
205 if (shared_repository) {
206 path[len] = 0;
207 adjust_shared_perm(path);
208 strcpy(path + len, "refs");
209 adjust_shared_perm(path);
210 strcpy(path + len, "refs/heads");
211 adjust_shared_perm(path);
212 strcpy(path + len, "refs/tags");
213 adjust_shared_perm(path);
214 }
215
216 /*
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 if (read_ref(path, sha1) < 0) {
222 if (create_symref(path, "refs/heads/master") < 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 if (!lstat(path, &st1)) {
235 struct stat st2;
236 int filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
237 !lstat(path, &st2) &&
238 st1.st_mode != st2.st_mode);
239 git_config_set("core.filemode",
240 filemode ? "true" : "false");
241 }
242 }
243
244 static const char init_db_usage[] =
245 "git-init-db [--template=<template-directory>] [--shared]";
246
247 /*
248 * If you want to, you can share the DB area with any number of branches.
249 * That has advantages: you can save space by sharing all the SHA1 objects.
250 * On the other hand, it might just make lookup slower and messier. You
251 * be the judge. The default case is to have one DB per managed directory.
252 */
253 int cmd_init_db(int argc, const char **argv, char **envp)
254 {
255 const char *git_dir;
256 const char *sha1_dir;
257 const char *template_dir = NULL;
258 char *path;
259 int len, i;
260
261 for (i = 1; i < argc; i++, argv++) {
262 const char *arg = argv[1];
263 if (!strncmp(arg, "--template=", 11))
264 template_dir = arg+11;
265 else if (!strcmp(arg, "--shared"))
266 shared_repository = PERM_GROUP;
267 else if (!strncmp(arg, "--shared=", 9))
268 shared_repository = git_config_perm("arg", arg+9);
269 else
270 die(init_db_usage);
271 }
272
273 /*
274 * Set up the default .git directory contents
275 */
276 git_dir = getenv(GIT_DIR_ENVIRONMENT);
277 if (!git_dir) {
278 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
279 fprintf(stderr, "defaulting to local storage area\n");
280 }
281 safe_create_dir(git_dir, 0);
282
283 /* Check to see if the repository version is right.
284 * Note that a newly created repository does not have
285 * config file, so this will not fail. What we are catching
286 * is an attempt to reinitialize new repository with an old tool.
287 */
288 check_repository_format();
289
290 create_default_files(git_dir, template_dir);
291
292 /*
293 * And set up the object store.
294 */
295 sha1_dir = get_object_directory();
296 len = strlen(sha1_dir);
297 path = xmalloc(len + 40);
298 memcpy(path, sha1_dir, len);
299
300 safe_create_dir(sha1_dir, 1);
301 strcpy(path+len, "/pack");
302 safe_create_dir(path, 1);
303 strcpy(path+len, "/info");
304 safe_create_dir(path, 1);
305
306 if (shared_repository) {
307 char buf[10];
308 /* We do not spell "group" and such, so that
309 * the configuration can be read by older version
310 * of git.
311 */
312 sprintf(buf, "%d", shared_repository);
313 git_config_set("core.sharedrepository", buf);
314 }
315
316 return 0;
317 }