1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6#include "cache.h"
7
8#ifndef DEFAULT_GIT_TEMPLATE_DIR
9#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates/"
10#endif
11
12static void safe_create_dir(const char *dir)
13{
14 if (mkdir(dir, 0777) < 0) {
15 if (errno != EEXIST) {
16 perror(dir);
17 exit(1);
18 }
19 }
20}
21
22static int copy_file(const char *dst, const char *src, int mode)
23{
24 int fdi, fdo, status;
25
26 mode = (mode & 0111) ? 0777 : 0666;
27 if ((fdi = open(src, O_RDONLY)) < 0)
28 return fdi;
29 if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
30 close(fdi);
31 return fdo;
32 }
33 status = copy_fd(fdi, fdo);
34 close(fdo);
35 return status;
36}
37
38static void copy_templates_1(char *path, int baselen,
39 char *template, int template_baselen,
40 DIR *dir)
41{
42 struct dirent *de;
43
44 /* Note: if ".git/hooks" file exists in the repository being
45 * re-initialized, /etc/core-git/templates/hooks/update would
46 * cause git-init-db to fail here. I think this is sane but
47 * it means that the set of templates we ship by default, along
48 * with the way the namespace under .git/ is organized, should
49 * be really carefully chosen.
50 */
51 safe_create_dir(path);
52 while ((de = readdir(dir)) != NULL) {
53 struct stat st_git, st_template;
54 int namelen;
55 int exists = 0;
56
57 if (de->d_name[0] == '.')
58 continue;
59 namelen = strlen(de->d_name);
60 if ((PATH_MAX <= baselen + namelen) ||
61 (PATH_MAX <= template_baselen + namelen))
62 die("insanely long template name %s", de->d_name);
63 memcpy(path + baselen, de->d_name, namelen+1);
64 memcpy(template + template_baselen, de->d_name, namelen+1);
65 if (lstat(path, &st_git)) {
66 if (errno != ENOENT)
67 die("cannot stat %s", path);
68 }
69 else
70 exists = 1;
71
72 if (lstat(template, &st_template))
73 die("cannot stat template %s", template);
74
75 if (S_ISDIR(st_template.st_mode)) {
76 DIR *subdir = opendir(template);
77 int baselen_sub = baselen + namelen;
78 int template_baselen_sub = template_baselen + namelen;
79 if (!subdir)
80 die("cannot opendir %s", template);
81 path[baselen_sub++] =
82 template[template_baselen_sub++] = '/';
83 path[baselen_sub] =
84 template[template_baselen_sub] = 0;
85 copy_templates_1(path, baselen_sub,
86 template, template_baselen_sub,
87 subdir);
88 closedir(subdir);
89 }
90 else if (exists)
91 continue;
92 else if (S_ISLNK(st_template.st_mode)) {
93 char lnk[256];
94 int len;
95 len = readlink(template, lnk, sizeof(lnk));
96 if (len < 0)
97 die("cannot readlink %s", template);
98 if (sizeof(lnk) <= len)
99 die("insanely long symlink %s", template);
100 lnk[len] = 0;
101 if (symlink(lnk, path))
102 die("cannot symlink %s %s", lnk, path);
103 }
104 else if (S_ISREG(st_template.st_mode)) {
105 if (copy_file(path, template, st_template.st_mode))
106 die("cannot copy %s to %s", template, path);
107 }
108 else
109 error("ignoring template %s", template);
110 }
111}
112
113static void copy_templates(const char *git_dir, int len, char *template_dir)
114{
115 char path[PATH_MAX];
116 char template_path[PATH_MAX];
117 int template_len;
118 DIR *dir;
119
120 if (!template_dir)
121 template_dir = DEFAULT_GIT_TEMPLATE_DIR;
122 strcpy(template_path, template_dir);
123 template_len = strlen(template_path);
124 if (template_path[template_len-1] != '/') {
125 template_path[template_len++] = '/';
126 template_path[template_len] = 0;
127 }
128 dir = opendir(template_path);
129 if (!dir) {
130 fprintf(stderr, "warning: templates not found %s\n",
131 template_dir);
132 return;
133 }
134
135 /* Make sure that template is from the correct vintage */
136 strcpy(template_path + template_len, "config");
137 repository_format_version = 0;
138 git_config_from_file(check_repository_format_version,
139 template_path);
140 template_path[template_len] = 0;
141
142 if (repository_format_version &&
143 repository_format_version != GIT_REPO_VERSION) {
144 fprintf(stderr, "warning: not copying templates of "
145 "a wrong format version %d from '%s'\n",
146 repository_format_version,
147 template_dir);
148 closedir(dir);
149 return;
150 }
151
152 memcpy(path, git_dir, len);
153 path[len] = 0;
154 copy_templates_1(path, len,
155 template_path, template_len,
156 dir);
157 closedir(dir);
158}
159
160static void create_default_files(const char *git_dir, char *template_path)
161{
162 unsigned len = strlen(git_dir);
163 static char path[PATH_MAX];
164 unsigned char sha1[20];
165 struct stat st1;
166 char repo_version_string[10];
167
168 if (len > sizeof(path)-50)
169 die("insane git directory %s", git_dir);
170 memcpy(path, git_dir, len);
171
172 if (len && path[len-1] != '/')
173 path[len++] = '/';
174
175 /*
176 * Create .git/refs/{heads,tags}
177 */
178 strcpy(path + len, "refs");
179 safe_create_dir(path);
180 strcpy(path + len, "refs/heads");
181 safe_create_dir(path);
182 strcpy(path + len, "refs/tags");
183 safe_create_dir(path);
184
185 /* First copy the templates -- we might have the default
186 * config file there, in which case we would want to read
187 * from it after installing.
188 */
189 path[len] = 0;
190 copy_templates(path, len, template_path);
191
192 git_config(git_default_config);
193
194 /*
195 * Create the default symlink from ".git/HEAD" to the "master"
196 * branch, if it does not exist yet.
197 */
198 strcpy(path + len, "HEAD");
199 if (read_ref(path, sha1) < 0) {
200 if (create_symref(path, "refs/heads/master") < 0)
201 exit(1);
202 }
203
204 /* This forces creation of new config file */
205 sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
206 git_config_set("core.repositoryformatversion", repo_version_string);
207
208 path[len] = 0;
209 strcpy(path + len, "config");
210
211 /* Check filemode trustability */
212 if (!lstat(path, &st1)) {
213 struct stat st2;
214 int filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
215 !lstat(path, &st2) &&
216 st1.st_mode != st2.st_mode);
217 git_config_set("core.filemode",
218 filemode ? "true" : "false");
219 }
220}
221
222static const char init_db_usage[] =
223"git-init-db [--template=<template-directory>]";
224
225/*
226 * If you want to, you can share the DB area with any number of branches.
227 * That has advantages: you can save space by sharing all the SHA1 objects.
228 * On the other hand, it might just make lookup slower and messier. You
229 * be the judge. The default case is to have one DB per managed directory.
230 */
231int main(int argc, char **argv)
232{
233 const char *git_dir;
234 const char *sha1_dir;
235 char *path, *template_dir = NULL;
236 int len, i;
237
238 for (i = 1; i < argc; i++, argv++) {
239 char *arg = argv[1];
240 if (arg[0] != '-')
241 break;
242 else if (!strncmp(arg, "--template=", 11))
243 template_dir = arg+11;
244 else
245 die(init_db_usage);
246 }
247
248 /*
249 * Set up the default .git directory contents
250 */
251 git_dir = getenv(GIT_DIR_ENVIRONMENT);
252 if (!git_dir) {
253 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
254 fprintf(stderr, "defaulting to local storage area\n");
255 }
256 safe_create_dir(git_dir);
257
258 /* Check to see if the repository version is right.
259 * Note that a newly created repository does not have
260 * config file, so this will not fail. What we are catching
261 * is an attempt to reinitialize new repository with an old tool.
262 */
263 check_repository_format();
264
265 create_default_files(git_dir, template_dir);
266
267 /*
268 * And set up the object store.
269 */
270 sha1_dir = get_object_directory();
271 len = strlen(sha1_dir);
272 path = xmalloc(len + 40);
273 memcpy(path, sha1_dir, len);
274
275 safe_create_dir(sha1_dir);
276 strcpy(path+len, "/pack");
277 safe_create_dir(path);
278 strcpy(path+len, "/info");
279 safe_create_dir(path);
280 return 0;
281}