Merge branch 'jk/repository-extension'
[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 "refs.h"
8 #include "builtin.h"
9 #include "exec_cmd.h"
10 #include "parse-options.h"
11
12 #ifndef DEFAULT_GIT_TEMPLATE_DIR
13 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
14 #endif
15
16 #ifdef NO_TRUSTABLE_FILEMODE
17 #define TEST_FILEMODE 0
18 #else
19 #define TEST_FILEMODE 1
20 #endif
21
22 static int init_is_bare_repository = 0;
23 static int init_shared_repository = -1;
24 static const char *init_db_template_dir;
25 static const char *git_link;
26
27 static void safe_create_dir(const char *dir, int share)
28 {
29         if (mkdir(dir, 0777) < 0) {
30                 if (errno != EEXIST) {
31                         perror(dir);
32                         exit(1);
33                 }
34         }
35         else if (share && adjust_shared_perm(dir))
36                 die(_("Could not make %s writable by group"), dir);
37 }
38
39 static void copy_templates_1(struct strbuf *path, struct strbuf *template,
40                              DIR *dir)
41 {
42         size_t path_baselen = path->len;
43         size_t template_baselen = template->len;
44         struct dirent *de;
45
46         /* Note: if ".git/hooks" file exists in the repository being
47          * re-initialized, /etc/core-git/templates/hooks/update would
48          * cause "git init" to fail here.  I think this is sane but
49          * it means that the set of templates we ship by default, along
50          * with the way the namespace under .git/ is organized, should
51          * be really carefully chosen.
52          */
53         safe_create_dir(path->buf, 1);
54         while ((de = readdir(dir)) != NULL) {
55                 struct stat st_git, st_template;
56                 int exists = 0;
57
58                 strbuf_setlen(path, path_baselen);
59                 strbuf_setlen(template, template_baselen);
60
61                 if (de->d_name[0] == '.')
62                         continue;
63                 strbuf_addstr(path, de->d_name);
64                 strbuf_addstr(template, de->d_name);
65                 if (lstat(path->buf, &st_git)) {
66                         if (errno != ENOENT)
67                                 die_errno(_("cannot stat '%s'"), path->buf);
68                 }
69                 else
70                         exists = 1;
71
72                 if (lstat(template->buf, &st_template))
73                         die_errno(_("cannot stat template '%s'"), template->buf);
74
75                 if (S_ISDIR(st_template.st_mode)) {
76                         DIR *subdir = opendir(template->buf);
77                         if (!subdir)
78                                 die_errno(_("cannot opendir '%s'"), template->buf);
79                         strbuf_addch(path, '/');
80                         strbuf_addch(template, '/');
81                         copy_templates_1(path, template, subdir);
82                         closedir(subdir);
83                 }
84                 else if (exists)
85                         continue;
86                 else if (S_ISLNK(st_template.st_mode)) {
87                         struct strbuf lnk = STRBUF_INIT;
88                         if (strbuf_readlink(&lnk, template->buf, 0) < 0)
89                                 die_errno(_("cannot readlink '%s'"), template->buf);
90                         if (symlink(lnk.buf, path->buf))
91                                 die_errno(_("cannot symlink '%s' '%s'"),
92                                           lnk.buf, path->buf);
93                         strbuf_release(&lnk);
94                 }
95                 else if (S_ISREG(st_template.st_mode)) {
96                         if (copy_file(path->buf, template->buf, st_template.st_mode))
97                                 die_errno(_("cannot copy '%s' to '%s'"),
98                                           template->buf, path->buf);
99                 }
100                 else
101                         error(_("ignoring template %s"), template->buf);
102         }
103 }
104
105 static void copy_templates(const char *template_dir)
106 {
107         struct strbuf path = STRBUF_INIT;
108         struct strbuf template_path = STRBUF_INIT;
109         size_t template_len;
110         DIR *dir;
111         char *to_free = NULL;
112
113         if (!template_dir)
114                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
115         if (!template_dir)
116                 template_dir = init_db_template_dir;
117         if (!template_dir)
118                 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
119         if (!template_dir[0]) {
120                 free(to_free);
121                 return;
122         }
123
124         strbuf_addstr(&template_path, template_dir);
125         strbuf_complete(&template_path, '/');
126         template_len = template_path.len;
127
128         dir = opendir(template_path.buf);
129         if (!dir) {
130                 warning(_("templates not found %s"), template_dir);
131                 goto free_return;
132         }
133
134         /* Make sure that template is from the correct vintage */
135         strbuf_addstr(&template_path, "config");
136         repository_format_version = 0;
137         git_config_from_file(check_repository_format_version,
138                              template_path.buf, NULL);
139         strbuf_setlen(&template_path, template_len);
140
141         if (repository_format_version &&
142             repository_format_version != GIT_REPO_VERSION) {
143                 warning(_("not copying templates of "
144                         "a wrong format version %d from '%s'"),
145                         repository_format_version,
146                         template_dir);
147                 goto close_free_return;
148         }
149
150         strbuf_addstr(&path, get_git_dir());
151         strbuf_complete(&path, '/');
152         copy_templates_1(&path, &template_path, dir);
153 close_free_return:
154         closedir(dir);
155 free_return:
156         free(to_free);
157         strbuf_release(&path);
158         strbuf_release(&template_path);
159 }
160
161 static int git_init_db_config(const char *k, const char *v, void *cb)
162 {
163         if (!strcmp(k, "init.templatedir"))
164                 return git_config_pathname(&init_db_template_dir, k, v);
165
166         return 0;
167 }
168
169 /*
170  * If the git_dir is not directly inside the working tree, then git will not
171  * find it by default, and we need to set the worktree explicitly.
172  */
173 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
174 {
175         if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
176                 return 0;
177         if (skip_prefix(git_dir, work_tree, &git_dir) &&
178             !strcmp(git_dir, "/.git"))
179                 return 0;
180         return 1;
181 }
182
183 static int create_default_files(const char *template_path)
184 {
185         struct stat st1;
186         struct strbuf buf = STRBUF_INIT;
187         char *path;
188         char repo_version_string[10];
189         char junk[2];
190         int reinit;
191         int filemode;
192
193         /*
194          * Create .git/refs/{heads,tags}
195          */
196         safe_create_dir(git_path_buf(&buf, "refs"), 1);
197         safe_create_dir(git_path_buf(&buf, "refs/heads"), 1);
198         safe_create_dir(git_path_buf(&buf, "refs/tags"), 1);
199
200         /* Just look for `init.templatedir` */
201         git_config(git_init_db_config, NULL);
202
203         /* 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         copy_templates(template_path);
208
209         git_config(git_default_config, NULL);
210         is_bare_repository_cfg = init_is_bare_repository;
211
212         /* reading existing config may have overwrote it */
213         if (init_shared_repository != -1)
214                 shared_repository = init_shared_repository;
215
216         /*
217          * We would have created the above under user's umask -- under
218          * shared-repository settings, we would need to fix them up.
219          */
220         if (shared_repository) {
221                 adjust_shared_perm(get_git_dir());
222                 adjust_shared_perm(git_path_buf(&buf, "refs"));
223                 adjust_shared_perm(git_path_buf(&buf, "refs/heads"));
224                 adjust_shared_perm(git_path_buf(&buf, "refs/tags"));
225         }
226
227         /*
228          * Create the default symlink from ".git/HEAD" to the "master"
229          * branch, if it does not exist yet.
230          */
231         path = git_path_buf(&buf, "HEAD");
232         reinit = (!access(path, R_OK)
233                   || readlink(path, junk, sizeof(junk)-1) != -1);
234         if (!reinit) {
235                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
236                         exit(1);
237         }
238
239         /* This forces creation of new config file */
240         xsnprintf(repo_version_string, sizeof(repo_version_string),
241                   "%d", GIT_REPO_VERSION);
242         git_config_set("core.repositoryformatversion", repo_version_string);
243
244         /* Check filemode trustability */
245         path = git_path_buf(&buf, "config");
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                                 !chmod(path, st1.st_mode));
253                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
254                         filemode = 0;
255         }
256         git_config_set("core.filemode", filemode ? "true" : "false");
257
258         if (is_bare_repository())
259                 git_config_set("core.bare", "true");
260         else {
261                 const char *work_tree = get_git_work_tree();
262                 git_config_set("core.bare", "false");
263                 /* allow template config file to override the default */
264                 if (log_all_ref_updates == -1)
265                     git_config_set("core.logallrefupdates", "true");
266                 if (needs_work_tree_config(get_git_dir(), work_tree))
267                         git_config_set("core.worktree", work_tree);
268         }
269
270         if (!reinit) {
271                 /* Check if symlink is supported in the work tree */
272                 path = git_path_buf(&buf, "tXXXXXX");
273                 if (!close(xmkstemp(path)) &&
274                     !unlink(path) &&
275                     !symlink("testing", path) &&
276                     !lstat(path, &st1) &&
277                     S_ISLNK(st1.st_mode))
278                         unlink(path); /* good */
279                 else
280                         git_config_set("core.symlinks", "false");
281
282                 /* Check if the filesystem is case-insensitive */
283                 path = git_path_buf(&buf, "CoNfIg");
284                 if (!access(path, F_OK))
285                         git_config_set("core.ignorecase", "true");
286                 probe_utf8_pathname_composition();
287         }
288
289         strbuf_release(&buf);
290         return reinit;
291 }
292
293 static void create_object_directory(void)
294 {
295         struct strbuf path = STRBUF_INIT;
296         size_t baselen;
297
298         strbuf_addstr(&path, get_object_directory());
299         baselen = path.len;
300
301         safe_create_dir(path.buf, 1);
302
303         strbuf_setlen(&path, baselen);
304         strbuf_addstr(&path, "/pack");
305         safe_create_dir(path.buf, 1);
306
307         strbuf_setlen(&path, baselen);
308         strbuf_addstr(&path, "/info");
309         safe_create_dir(path.buf, 1);
310
311         strbuf_release(&path);
312 }
313
314 int set_git_dir_init(const char *git_dir, const char *real_git_dir,
315                      int exist_ok)
316 {
317         if (real_git_dir) {
318                 struct stat st;
319
320                 if (!exist_ok && !stat(git_dir, &st))
321                         die(_("%s already exists"), git_dir);
322
323                 if (!exist_ok && !stat(real_git_dir, &st))
324                         die(_("%s already exists"), real_git_dir);
325
326                 /*
327                  * make sure symlinks are resolved because we'll be
328                  * moving the target repo later on in separate_git_dir()
329                  */
330                 git_link = xstrdup(real_path(git_dir));
331                 set_git_dir(real_path(real_git_dir));
332         }
333         else {
334                 set_git_dir(real_path(git_dir));
335                 git_link = NULL;
336         }
337         return 0;
338 }
339
340 static void separate_git_dir(const char *git_dir)
341 {
342         struct stat st;
343
344         if (!stat(git_link, &st)) {
345                 const char *src;
346
347                 if (S_ISREG(st.st_mode))
348                         src = read_gitfile(git_link);
349                 else if (S_ISDIR(st.st_mode))
350                         src = git_link;
351                 else
352                         die(_("unable to handle file type %d"), (int)st.st_mode);
353
354                 if (rename(src, git_dir))
355                         die_errno(_("unable to move %s to %s"), src, git_dir);
356         }
357
358         write_file(git_link, "gitdir: %s", git_dir);
359 }
360
361 int init_db(const char *template_dir, unsigned int flags)
362 {
363         int reinit;
364         const char *git_dir = get_git_dir();
365
366         if (git_link)
367                 separate_git_dir(git_dir);
368
369         safe_create_dir(git_dir, 0);
370
371         init_is_bare_repository = is_bare_repository();
372
373         /* Check to see if the repository version is right.
374          * Note that a newly created repository does not have
375          * config file, so this will not fail.  What we are catching
376          * is an attempt to reinitialize new repository with an old tool.
377          */
378         check_repository_format();
379
380         reinit = create_default_files(template_dir);
381
382         create_object_directory();
383
384         if (shared_repository) {
385                 char buf[10];
386                 /* We do not spell "group" and such, so that
387                  * the configuration can be read by older version
388                  * of git. Note, we use octal numbers for new share modes,
389                  * and compatibility values for PERM_GROUP and
390                  * PERM_EVERYBODY.
391                  */
392                 if (shared_repository < 0)
393                         /* force to the mode value */
394                         xsnprintf(buf, sizeof(buf), "0%o", -shared_repository);
395                 else if (shared_repository == PERM_GROUP)
396                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
397                 else if (shared_repository == PERM_EVERYBODY)
398                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
399                 else
400                         die("BUG: invalid value for shared_repository");
401                 git_config_set("core.sharedrepository", buf);
402                 git_config_set("receive.denyNonFastforwards", "true");
403         }
404
405         if (!(flags & INIT_DB_QUIET)) {
406                 int len = strlen(git_dir);
407
408                 /* TRANSLATORS: The first '%s' is either "Reinitialized
409                    existing" or "Initialized empty", the second " shared" or
410                    "", and the last '%s%s' is the verbatim directory name. */
411                 printf(_("%s%s Git repository in %s%s\n"),
412                        reinit ? _("Reinitialized existing") : _("Initialized empty"),
413                        shared_repository ? _(" shared") : "",
414                        git_dir, len && git_dir[len-1] != '/' ? "/" : "");
415         }
416
417         return 0;
418 }
419
420 static int guess_repository_type(const char *git_dir)
421 {
422         const char *slash;
423         char *cwd;
424         int cwd_is_git_dir;
425
426         /*
427          * "GIT_DIR=. git init" is always bare.
428          * "GIT_DIR=`pwd` git init" too.
429          */
430         if (!strcmp(".", git_dir))
431                 return 1;
432         cwd = xgetcwd();
433         cwd_is_git_dir = !strcmp(git_dir, cwd);
434         free(cwd);
435         if (cwd_is_git_dir)
436                 return 1;
437         /*
438          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
439          */
440         if (!strcmp(git_dir, ".git"))
441                 return 0;
442         slash = strrchr(git_dir, '/');
443         if (slash && !strcmp(slash, "/.git"))
444                 return 0;
445
446         /*
447          * Otherwise it is often bare.  At this point
448          * we are just guessing.
449          */
450         return 1;
451 }
452
453 static int shared_callback(const struct option *opt, const char *arg, int unset)
454 {
455         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
456         return 0;
457 }
458
459 static const char *const init_db_usage[] = {
460         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
461         NULL
462 };
463
464 /*
465  * If you want to, you can share the DB area with any number of branches.
466  * That has advantages: you can save space by sharing all the SHA1 objects.
467  * On the other hand, it might just make lookup slower and messier. You
468  * be the judge.  The default case is to have one DB per managed directory.
469  */
470 int cmd_init_db(int argc, const char **argv, const char *prefix)
471 {
472         const char *git_dir;
473         const char *real_git_dir = NULL;
474         const char *work_tree;
475         const char *template_dir = NULL;
476         unsigned int flags = 0;
477         const struct option init_db_options[] = {
478                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
479                                 N_("directory from which templates will be used")),
480                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
481                                 N_("create a bare repository"), 1),
482                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
483                         N_("permissions"),
484                         N_("specify that the git repository is to be shared amongst several users"),
485                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
486                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
487                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
488                            N_("separate git dir from working tree")),
489                 OPT_END()
490         };
491
492         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
493
494         if (real_git_dir && !is_absolute_path(real_git_dir))
495                 real_git_dir = xstrdup(real_path(real_git_dir));
496
497         if (argc == 1) {
498                 int mkdir_tried = 0;
499         retry:
500                 if (chdir(argv[0]) < 0) {
501                         if (!mkdir_tried) {
502                                 int saved;
503                                 /*
504                                  * At this point we haven't read any configuration,
505                                  * and we know shared_repository should always be 0;
506                                  * but just in case we play safe.
507                                  */
508                                 saved = shared_repository;
509                                 shared_repository = 0;
510                                 switch (safe_create_leading_directories_const(argv[0])) {
511                                 case SCLD_OK:
512                                 case SCLD_PERMS:
513                                         break;
514                                 case SCLD_EXISTS:
515                                         errno = EEXIST;
516                                         /* fallthru */
517                                 default:
518                                         die_errno(_("cannot mkdir %s"), argv[0]);
519                                         break;
520                                 }
521                                 shared_repository = saved;
522                                 if (mkdir(argv[0], 0777) < 0)
523                                         die_errno(_("cannot mkdir %s"), argv[0]);
524                                 mkdir_tried = 1;
525                                 goto retry;
526                         }
527                         die_errno(_("cannot chdir to %s"), argv[0]);
528                 }
529         } else if (0 < argc) {
530                 usage(init_db_usage[0]);
531         }
532         if (is_bare_repository_cfg == 1) {
533                 char *cwd = xgetcwd();
534                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
535                 free(cwd);
536         }
537
538         if (init_shared_repository != -1)
539                 shared_repository = init_shared_repository;
540
541         /*
542          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
543          * without --bare.  Catch the error early.
544          */
545         git_dir = getenv(GIT_DIR_ENVIRONMENT);
546         work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
547         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
548                 die(_("%s (or --work-tree=<directory>) not allowed without "
549                           "specifying %s (or --git-dir=<directory>)"),
550                     GIT_WORK_TREE_ENVIRONMENT,
551                     GIT_DIR_ENVIRONMENT);
552
553         /*
554          * Set up the default .git directory contents
555          */
556         if (!git_dir)
557                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
558
559         if (is_bare_repository_cfg < 0)
560                 is_bare_repository_cfg = guess_repository_type(git_dir);
561
562         if (!is_bare_repository_cfg) {
563                 const char *git_dir_parent = strrchr(git_dir, '/');
564                 if (git_dir_parent) {
565                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
566                         git_work_tree_cfg = xstrdup(real_path(rel));
567                         free(rel);
568                 }
569                 if (!git_work_tree_cfg)
570                         git_work_tree_cfg = xgetcwd();
571                 if (work_tree)
572                         set_git_work_tree(work_tree);
573                 else
574                         set_git_work_tree(git_work_tree_cfg);
575                 if (access(get_git_work_tree(), X_OK))
576                         die_errno (_("Cannot access work tree '%s'"),
577                                    get_git_work_tree());
578         }
579         else {
580                 if (work_tree)
581                         set_git_work_tree(work_tree);
582         }
583
584         set_git_dir_init(git_dir, real_git_dir, 1);
585
586         return init_db(template_dir, flags);
587 }