Code

diff.c: associate a flag with each pattern and use it for compiling regex
[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 #include "exec_cmd.h"
10 #ifndef DEFAULT_GIT_TEMPLATE_DIR
11 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
12 #endif
14 #ifdef NO_TRUSTABLE_FILEMODE
15 #define TEST_FILEMODE 0
16 #else
17 #define TEST_FILEMODE 1
18 #endif
20 static 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 }
32 static void copy_templates_1(char *path, int baselen,
33                              char *template, int template_baselen,
34                              DIR *dir)
35 {
36         struct dirent *de;
38         /* 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;
51                 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;
66                 if (lstat(template, &st_template))
67                         die("cannot stat template %s", template);
69                 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         }
107 static void copy_templates(const char *template_dir)
109         char path[PATH_MAX];
110         char template_path[PATH_MAX];
111         int template_len;
112         DIR *dir;
113         const char *git_dir = get_git_dir();
114         int len = strlen(git_dir);
116         if (!template_dir)
117                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
118         if (!template_dir)
119                 template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
120         if (!template_dir[0])
121                 return;
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         }
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, NULL);
140         template_path[template_len] = 0;
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         }
152         memcpy(path, git_dir, len);
153         if (len && path[len - 1] != '/')
154                 path[len++] = '/';
155         path[len] = 0;
156         copy_templates_1(path, len,
157                          template_path, template_len,
158                          dir);
159         closedir(dir);
162 static int create_default_files(const char *template_path)
164         const char *git_dir = get_git_dir();
165         unsigned len = strlen(git_dir);
166         static char path[PATH_MAX];
167         struct stat st1;
168         char repo_version_string[10];
169         char junk[2];
170         int reinit;
171         int filemode;
173         if (len > sizeof(path)-50)
174                 die("insane git directory %s", git_dir);
175         memcpy(path, git_dir, len);
177         if (len && path[len-1] != '/')
178                 path[len++] = '/';
180         /*
181          * Create .git/refs/{heads,tags}
182          */
183         safe_create_dir(git_path("refs"), 1);
184         safe_create_dir(git_path("refs/heads"), 1);
185         safe_create_dir(git_path("refs/tags"), 1);
187         /* First copy the templates -- we might have the default
188          * config file there, in which case we would want to read
189          * from it after installing.
190          */
191         copy_templates(template_path);
193         git_config(git_default_config, NULL);
195         /*
196          * We would have created the above under user's umask -- under
197          * shared-repository settings, we would need to fix them up.
198          */
199         if (shared_repository) {
200                 adjust_shared_perm(get_git_dir());
201                 adjust_shared_perm(git_path("refs"));
202                 adjust_shared_perm(git_path("refs/heads"));
203                 adjust_shared_perm(git_path("refs/tags"));
204         }
206         /*
207          * Create the default symlink from ".git/HEAD" to the "master"
208          * branch, if it does not exist yet.
209          */
210         strcpy(path + len, "HEAD");
211         reinit = (!access(path, R_OK)
212                   || readlink(path, junk, sizeof(junk)-1) != -1);
213         if (!reinit) {
214                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
215                         exit(1);
216         }
218         /* This forces creation of new config file */
219         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
220         git_config_set("core.repositoryformatversion", repo_version_string);
222         path[len] = 0;
223         strcpy(path + len, "config");
225         /* Check filemode trustability */
226         filemode = TEST_FILEMODE;
227         if (TEST_FILEMODE && !lstat(path, &st1)) {
228                 struct stat st2;
229                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
230                                 !lstat(path, &st2) &&
231                                 st1.st_mode != st2.st_mode);
232         }
233         git_config_set("core.filemode", filemode ? "true" : "false");
235         if (is_bare_repository())
236                 git_config_set("core.bare", "true");
237         else {
238                 const char *work_tree = get_git_work_tree();
239                 git_config_set("core.bare", "false");
240                 /* allow template config file to override the default */
241                 if (log_all_ref_updates == -1)
242                     git_config_set("core.logallrefupdates", "true");
243                 if (prefixcmp(git_dir, work_tree) ||
244                     strcmp(git_dir + strlen(work_tree), "/.git")) {
245                         git_config_set("core.worktree", work_tree);
246                 }
247         }
249         if (!reinit) {
250                 /* Check if symlink is supported in the work tree */
251                 path[len] = 0;
252                 strcpy(path + len, "tXXXXXX");
253                 if (!close(xmkstemp(path)) &&
254                     !unlink(path) &&
255                     !symlink("testing", path) &&
256                     !lstat(path, &st1) &&
257                     S_ISLNK(st1.st_mode))
258                         unlink(path); /* good */
259                 else
260                         git_config_set("core.symlinks", "false");
262                 /* Check if the filesystem is case-insensitive */
263                 path[len] = 0;
264                 strcpy(path + len, "CoNfIg");
265                 if (!access(path, F_OK))
266                         git_config_set("core.ignorecase", "true");
267         }
269         return reinit;
272 int init_db(const char *template_dir, unsigned int flags)
274         const char *sha1_dir;
275         char *path;
276         int len, reinit;
278         safe_create_dir(get_git_dir(), 0);
280         /* Check to see if the repository version is right.
281          * Note that a newly created repository does not have
282          * config file, so this will not fail.  What we are catching
283          * is an attempt to reinitialize new repository with an old tool.
284          */
285         check_repository_format();
287         reinit = create_default_files(template_dir);
289         sha1_dir = get_object_directory();
290         len = strlen(sha1_dir);
291         path = xmalloc(len + 40);
292         memcpy(path, sha1_dir, len);
294         safe_create_dir(sha1_dir, 1);
295         strcpy(path+len, "/pack");
296         safe_create_dir(path, 1);
297         strcpy(path+len, "/info");
298         safe_create_dir(path, 1);
300         if (shared_repository) {
301                 char buf[10];
302                 /* We do not spell "group" and such, so that
303                  * the configuration can be read by older version
304                  * of git. Note, we use octal numbers for new share modes,
305                  * and compatibility values for PERM_GROUP and
306                  * PERM_EVERYBODY.
307                  */
308                 if (shared_repository == PERM_GROUP)
309                         sprintf(buf, "%d", OLD_PERM_GROUP);
310                 else if (shared_repository == PERM_EVERYBODY)
311                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
312                 else
313                         sprintf(buf, "0%o", shared_repository);
314                 git_config_set("core.sharedrepository", buf);
315                 git_config_set("receive.denyNonFastforwards", "true");
316         }
318         if (!(flags & INIT_DB_QUIET))
319                 printf("%s%s Git repository in %s/\n",
320                        reinit ? "Reinitialized existing" : "Initialized empty",
321                        shared_repository ? " shared" : "",
322                        get_git_dir());
324         return 0;
327 static int guess_repository_type(const char *git_dir)
329         char cwd[PATH_MAX];
330         const char *slash;
332         /*
333          * "GIT_DIR=. git init" is always bare.
334          * "GIT_DIR=`pwd` git init" too.
335          */
336         if (!strcmp(".", git_dir))
337                 return 1;
338         if (!getcwd(cwd, sizeof(cwd)))
339                 die("cannot tell cwd");
340         if (!strcmp(git_dir, cwd))
341                 return 1;
342         /*
343          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
344          */
345         if (!strcmp(git_dir, ".git"))
346                 return 0;
347         slash = strrchr(git_dir, '/');
348         if (slash && !strcmp(slash, "/.git"))
349                 return 0;
351         /*
352          * Otherwise it is often bare.  At this point
353          * we are just guessing.
354          */
355         return 1;
358 static const char init_db_usage[] =
359 "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]]";
361 /*
362  * If you want to, you can share the DB area with any number of branches.
363  * That has advantages: you can save space by sharing all the SHA1 objects.
364  * On the other hand, it might just make lookup slower and messier. You
365  * be the judge.  The default case is to have one DB per managed directory.
366  */
367 int cmd_init_db(int argc, const char **argv, const char *prefix)
369         const char *git_dir;
370         const char *template_dir = NULL;
371         unsigned int flags = 0;
372         int i;
374         for (i = 1; i < argc; i++, argv++) {
375                 const char *arg = argv[1];
376                 if (!prefixcmp(arg, "--template="))
377                         template_dir = arg+11;
378                 else if (!strcmp(arg, "--bare")) {
379                         static char git_dir[PATH_MAX+1];
380                         is_bare_repository_cfg = 1;
381                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir,
382                                                 sizeof(git_dir)), 0);
383                 } else if (!strcmp(arg, "--shared"))
384                         shared_repository = PERM_GROUP;
385                 else if (!prefixcmp(arg, "--shared="))
386                         shared_repository = git_config_perm("arg", arg+9);
387                 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
388                         flags |= INIT_DB_QUIET;
389                 else
390                         usage(init_db_usage);
391         }
393         /*
394          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
395          * without --bare.  Catch the error early.
396          */
397         git_dir = getenv(GIT_DIR_ENVIRONMENT);
398         if ((!git_dir || is_bare_repository_cfg == 1)
399             && getenv(GIT_WORK_TREE_ENVIRONMENT))
400                 die("%s (or --work-tree=<directory>) not allowed without "
401                     "specifying %s (or --git-dir=<directory>)",
402                     GIT_WORK_TREE_ENVIRONMENT,
403                     GIT_DIR_ENVIRONMENT);
405         /*
406          * Set up the default .git directory contents
407          */
408         if (!git_dir)
409                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
411         if (is_bare_repository_cfg < 0)
412                 is_bare_repository_cfg = guess_repository_type(git_dir);
414         if (!is_bare_repository_cfg) {
415                 if (git_dir) {
416                         const char *git_dir_parent = strrchr(git_dir, '/');
417                         if (git_dir_parent) {
418                                 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
419                                 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
420                                 free(rel);
421                         }
422                 }
423                 if (!git_work_tree_cfg) {
424                         git_work_tree_cfg = xcalloc(PATH_MAX, 1);
425                         if (!getcwd(git_work_tree_cfg, PATH_MAX))
426                                 die ("Cannot access current working directory.");
427                 }
428                 if (access(get_git_work_tree(), X_OK))
429                         die ("Cannot access work tree '%s'",
430                              get_git_work_tree());
431         }
433         set_git_dir(make_absolute_path(git_dir));
435         return init_db(template_dir, flags);