Merge branch 'js/msgfmt-on-windows' of ../git-gui into js/git-gui-msgfmt-on-windows
[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 "config.h"
8 #include "refs.h"
9 #include "builtin.h"
10 #include "exec_cmd.h"
11 #include "parse-options.h"
12
13 #ifndef DEFAULT_GIT_TEMPLATE_DIR
14 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
15 #endif
16
17 #ifdef NO_TRUSTABLE_FILEMODE
18 #define TEST_FILEMODE 0
19 #else
20 #define TEST_FILEMODE 1
21 #endif
22
23 static int init_is_bare_repository = 0;
24 static int init_shared_repository = -1;
25 static const char *init_db_template_dir;
26
27 static void copy_templates_1(struct strbuf *path, struct strbuf *template,
28                              DIR *dir)
29 {
30         size_t path_baselen = path->len;
31         size_t template_baselen = template->len;
32         struct dirent *de;
33
34         /* Note: if ".git/hooks" file exists in the repository being
35          * re-initialized, /etc/core-git/templates/hooks/update would
36          * cause "git init" to fail here.  I think this is sane but
37          * it means that the set of templates we ship by default, along
38          * with the way the namespace under .git/ is organized, should
39          * be really carefully chosen.
40          */
41         safe_create_dir(path->buf, 1);
42         while ((de = readdir(dir)) != NULL) {
43                 struct stat st_git, st_template;
44                 int exists = 0;
45
46                 strbuf_setlen(path, path_baselen);
47                 strbuf_setlen(template, template_baselen);
48
49                 if (de->d_name[0] == '.')
50                         continue;
51                 strbuf_addstr(path, de->d_name);
52                 strbuf_addstr(template, de->d_name);
53                 if (lstat(path->buf, &st_git)) {
54                         if (errno != ENOENT)
55                                 die_errno(_("cannot stat '%s'"), path->buf);
56                 }
57                 else
58                         exists = 1;
59
60                 if (lstat(template->buf, &st_template))
61                         die_errno(_("cannot stat template '%s'"), template->buf);
62
63                 if (S_ISDIR(st_template.st_mode)) {
64                         DIR *subdir = opendir(template->buf);
65                         if (!subdir)
66                                 die_errno(_("cannot opendir '%s'"), template->buf);
67                         strbuf_addch(path, '/');
68                         strbuf_addch(template, '/');
69                         copy_templates_1(path, template, subdir);
70                         closedir(subdir);
71                 }
72                 else if (exists)
73                         continue;
74                 else if (S_ISLNK(st_template.st_mode)) {
75                         struct strbuf lnk = STRBUF_INIT;
76                         if (strbuf_readlink(&lnk, template->buf, 0) < 0)
77                                 die_errno(_("cannot readlink '%s'"), template->buf);
78                         if (symlink(lnk.buf, path->buf))
79                                 die_errno(_("cannot symlink '%s' '%s'"),
80                                           lnk.buf, path->buf);
81                         strbuf_release(&lnk);
82                 }
83                 else if (S_ISREG(st_template.st_mode)) {
84                         if (copy_file(path->buf, template->buf, st_template.st_mode))
85                                 die_errno(_("cannot copy '%s' to '%s'"),
86                                           template->buf, path->buf);
87                 }
88                 else
89                         error(_("ignoring template %s"), template->buf);
90         }
91 }
92
93 static void copy_templates(const char *template_dir)
94 {
95         struct strbuf path = STRBUF_INIT;
96         struct strbuf template_path = STRBUF_INIT;
97         size_t template_len;
98         struct repository_format template_format;
99         struct strbuf err = STRBUF_INIT;
100         DIR *dir;
101         char *to_free = NULL;
102
103         if (!template_dir)
104                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
105         if (!template_dir)
106                 template_dir = init_db_template_dir;
107         if (!template_dir)
108                 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
109         if (!template_dir[0]) {
110                 free(to_free);
111                 return;
112         }
113
114         strbuf_addstr(&template_path, template_dir);
115         strbuf_complete(&template_path, '/');
116         template_len = template_path.len;
117
118         dir = opendir(template_path.buf);
119         if (!dir) {
120                 warning(_("templates not found %s"), template_dir);
121                 goto free_return;
122         }
123
124         /* Make sure that template is from the correct vintage */
125         strbuf_addstr(&template_path, "config");
126         read_repository_format(&template_format, template_path.buf);
127         strbuf_setlen(&template_path, template_len);
128
129         /*
130          * No mention of version at all is OK, but anything else should be
131          * verified.
132          */
133         if (template_format.version >= 0 &&
134             verify_repository_format(&template_format, &err) < 0) {
135                 warning(_("not copying templates from '%s': %s"),
136                           template_dir, err.buf);
137                 strbuf_release(&err);
138                 goto close_free_return;
139         }
140
141         strbuf_addstr(&path, get_git_common_dir());
142         strbuf_complete(&path, '/');
143         copy_templates_1(&path, &template_path, dir);
144 close_free_return:
145         closedir(dir);
146 free_return:
147         free(to_free);
148         strbuf_release(&path);
149         strbuf_release(&template_path);
150 }
151
152 static int git_init_db_config(const char *k, const char *v, void *cb)
153 {
154         if (!strcmp(k, "init.templatedir"))
155                 return git_config_pathname(&init_db_template_dir, k, v);
156
157         return 0;
158 }
159
160 /*
161  * If the git_dir is not directly inside the working tree, then git will not
162  * find it by default, and we need to set the worktree explicitly.
163  */
164 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
165 {
166         if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
167                 return 0;
168         if (skip_prefix(git_dir, work_tree, &git_dir) &&
169             !strcmp(git_dir, "/.git"))
170                 return 0;
171         return 1;
172 }
173
174 static int create_default_files(const char *template_path,
175                                 const char *original_git_dir)
176 {
177         struct stat st1;
178         struct strbuf buf = STRBUF_INIT;
179         char *path;
180         char repo_version_string[10];
181         char junk[2];
182         int reinit;
183         int filemode;
184         struct strbuf err = STRBUF_INIT;
185
186         /* Just look for `init.templatedir` */
187         git_config(git_init_db_config, NULL);
188
189         /*
190          * First copy the templates -- we might have the default
191          * config file there, in which case we would want to read
192          * from it after installing.
193          *
194          * Before reading that config, we also need to clear out any cached
195          * values (since we've just potentially changed what's available on
196          * disk).
197          */
198         copy_templates(template_path);
199         git_config_clear();
200         reset_shared_repository();
201         git_config(git_default_config, NULL);
202
203         /*
204          * We must make sure command-line options continue to override any
205          * values we might have just re-read from the config.
206          */
207         is_bare_repository_cfg = init_is_bare_repository;
208         if (init_shared_repository != -1)
209                 set_shared_repository(init_shared_repository);
210
211         /*
212          * We would have created the above under user's umask -- under
213          * shared-repository settings, we would need to fix them up.
214          */
215         if (get_shared_repository()) {
216                 adjust_shared_perm(get_git_dir());
217         }
218
219         /*
220          * We need to create a "refs" dir in any case so that older
221          * versions of git can tell that this is a repository.
222          */
223         safe_create_dir(git_path("refs"), 1);
224         adjust_shared_perm(git_path("refs"));
225
226         if (refs_init_db(&err))
227                 die("failed to set up refs db: %s", err.buf);
228
229         /*
230          * Create the default symlink from ".git/HEAD" to the "master"
231          * branch, if it does not exist yet.
232          */
233         path = git_path_buf(&buf, "HEAD");
234         reinit = (!access(path, R_OK)
235                   || readlink(path, junk, sizeof(junk)-1) != -1);
236         if (!reinit) {
237                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
238                         exit(1);
239         }
240
241         /* This forces creation of new config file */
242         xsnprintf(repo_version_string, sizeof(repo_version_string),
243                   "%d", GIT_REPO_VERSION);
244         git_config_set("core.repositoryformatversion", repo_version_string);
245
246         /* Check filemode trustability */
247         path = git_path_buf(&buf, "config");
248         filemode = TEST_FILEMODE;
249         if (TEST_FILEMODE && !lstat(path, &st1)) {
250                 struct stat st2;
251                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
252                                 !lstat(path, &st2) &&
253                                 st1.st_mode != st2.st_mode &&
254                                 !chmod(path, st1.st_mode));
255                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
256                         filemode = 0;
257         }
258         git_config_set("core.filemode", filemode ? "true" : "false");
259
260         if (is_bare_repository())
261                 git_config_set("core.bare", "true");
262         else {
263                 const char *work_tree = get_git_work_tree();
264                 git_config_set("core.bare", "false");
265                 /* allow template config file to override the default */
266                 if (log_all_ref_updates == LOG_REFS_UNSET)
267                         git_config_set("core.logallrefupdates", "true");
268                 if (needs_work_tree_config(original_git_dir, work_tree))
269                         git_config_set("core.worktree", work_tree);
270         }
271
272         if (!reinit) {
273                 /* Check if symlink is supported in the work tree */
274                 path = git_path_buf(&buf, "tXXXXXX");
275                 if (!close(xmkstemp(path)) &&
276                     !unlink(path) &&
277                     !symlink("testing", path) &&
278                     !lstat(path, &st1) &&
279                     S_ISLNK(st1.st_mode))
280                         unlink(path); /* good */
281                 else
282                         git_config_set("core.symlinks", "false");
283
284                 /* Check if the filesystem is case-insensitive */
285                 path = git_path_buf(&buf, "CoNfIg");
286                 if (!access(path, F_OK))
287                         git_config_set("core.ignorecase", "true");
288                 probe_utf8_pathname_composition();
289         }
290
291         strbuf_release(&buf);
292         return reinit;
293 }
294
295 static void create_object_directory(void)
296 {
297         struct strbuf path = STRBUF_INIT;
298         size_t baselen;
299
300         strbuf_addstr(&path, get_object_directory());
301         baselen = path.len;
302
303         safe_create_dir(path.buf, 1);
304
305         strbuf_setlen(&path, baselen);
306         strbuf_addstr(&path, "/pack");
307         safe_create_dir(path.buf, 1);
308
309         strbuf_setlen(&path, baselen);
310         strbuf_addstr(&path, "/info");
311         safe_create_dir(path.buf, 1);
312
313         strbuf_release(&path);
314 }
315
316 static void separate_git_dir(const char *git_dir, const char *git_link)
317 {
318         struct stat st;
319
320         if (!stat(git_link, &st)) {
321                 const char *src;
322
323                 if (S_ISREG(st.st_mode))
324                         src = read_gitfile(git_link);
325                 else if (S_ISDIR(st.st_mode))
326                         src = git_link;
327                 else
328                         die(_("unable to handle file type %d"), (int)st.st_mode);
329
330                 if (rename(src, git_dir))
331                         die_errno(_("unable to move %s to %s"), src, git_dir);
332         }
333
334         write_file(git_link, "gitdir: %s", git_dir);
335 }
336
337 int init_db(const char *git_dir, const char *real_git_dir,
338             const char *template_dir, unsigned int flags)
339 {
340         int reinit;
341         int exist_ok = flags & INIT_DB_EXIST_OK;
342         char *original_git_dir = real_pathdup(git_dir, 1);
343
344         if (real_git_dir) {
345                 struct stat st;
346
347                 if (!exist_ok && !stat(git_dir, &st))
348                         die(_("%s already exists"), git_dir);
349
350                 if (!exist_ok && !stat(real_git_dir, &st))
351                         die(_("%s already exists"), real_git_dir);
352
353                 set_git_dir(real_path(real_git_dir));
354                 git_dir = get_git_dir();
355                 separate_git_dir(git_dir, original_git_dir);
356         }
357         else {
358                 set_git_dir(real_path(git_dir));
359                 git_dir = get_git_dir();
360         }
361         startup_info->have_repository = 1;
362
363         safe_create_dir(git_dir, 0);
364
365         init_is_bare_repository = is_bare_repository();
366
367         /* Check to see if the repository version is right.
368          * Note that a newly created repository does not have
369          * config file, so this will not fail.  What we are catching
370          * is an attempt to reinitialize new repository with an old tool.
371          */
372         check_repository_format();
373
374         reinit = create_default_files(template_dir, original_git_dir);
375
376         create_object_directory();
377
378         if (get_shared_repository()) {
379                 char buf[10];
380                 /* We do not spell "group" and such, so that
381                  * the configuration can be read by older version
382                  * of git. Note, we use octal numbers for new share modes,
383                  * and compatibility values for PERM_GROUP and
384                  * PERM_EVERYBODY.
385                  */
386                 if (get_shared_repository() < 0)
387                         /* force to the mode value */
388                         xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
389                 else if (get_shared_repository() == PERM_GROUP)
390                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
391                 else if (get_shared_repository() == PERM_EVERYBODY)
392                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
393                 else
394                         die("BUG: invalid value for shared_repository");
395                 git_config_set("core.sharedrepository", buf);
396                 git_config_set("receive.denyNonFastforwards", "true");
397         }
398
399         if (!(flags & INIT_DB_QUIET)) {
400                 int len = strlen(git_dir);
401
402                 if (reinit)
403                         printf(get_shared_repository()
404                                ? _("Reinitialized existing shared Git repository in %s%s\n")
405                                : _("Reinitialized existing Git repository in %s%s\n"),
406                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
407                 else
408                         printf(get_shared_repository()
409                                ? _("Initialized empty shared Git repository in %s%s\n")
410                                : _("Initialized empty Git repository in %s%s\n"),
411                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
412         }
413
414         free(original_git_dir);
415         return 0;
416 }
417
418 static int guess_repository_type(const char *git_dir)
419 {
420         const char *slash;
421         char *cwd;
422         int cwd_is_git_dir;
423
424         /*
425          * "GIT_DIR=. git init" is always bare.
426          * "GIT_DIR=`pwd` git init" too.
427          */
428         if (!strcmp(".", git_dir))
429                 return 1;
430         cwd = xgetcwd();
431         cwd_is_git_dir = !strcmp(git_dir, cwd);
432         free(cwd);
433         if (cwd_is_git_dir)
434                 return 1;
435         /*
436          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
437          */
438         if (!strcmp(git_dir, ".git"))
439                 return 0;
440         slash = strrchr(git_dir, '/');
441         if (slash && !strcmp(slash, "/.git"))
442                 return 0;
443
444         /*
445          * Otherwise it is often bare.  At this point
446          * we are just guessing.
447          */
448         return 1;
449 }
450
451 static int shared_callback(const struct option *opt, const char *arg, int unset)
452 {
453         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
454         return 0;
455 }
456
457 static const char *const init_db_usage[] = {
458         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
459         NULL
460 };
461
462 /*
463  * If you want to, you can share the DB area with any number of branches.
464  * That has advantages: you can save space by sharing all the SHA1 objects.
465  * On the other hand, it might just make lookup slower and messier. You
466  * be the judge.  The default case is to have one DB per managed directory.
467  */
468 int cmd_init_db(int argc, const char **argv, const char *prefix)
469 {
470         const char *git_dir;
471         const char *real_git_dir = NULL;
472         const char *work_tree;
473         const char *template_dir = NULL;
474         unsigned int flags = 0;
475         const struct option init_db_options[] = {
476                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
477                                 N_("directory from which templates will be used")),
478                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
479                                 N_("create a bare repository"), 1),
480                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
481                         N_("permissions"),
482                         N_("specify that the git repository is to be shared amongst several users"),
483                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
484                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
485                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
486                            N_("separate git dir from working tree")),
487                 OPT_END()
488         };
489
490         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
491
492         if (real_git_dir && !is_absolute_path(real_git_dir))
493                 real_git_dir = real_pathdup(real_git_dir, 1);
494
495         if (argc == 1) {
496                 int mkdir_tried = 0;
497         retry:
498                 if (chdir(argv[0]) < 0) {
499                         if (!mkdir_tried) {
500                                 int saved;
501                                 /*
502                                  * At this point we haven't read any configuration,
503                                  * and we know shared_repository should always be 0;
504                                  * but just in case we play safe.
505                                  */
506                                 saved = get_shared_repository();
507                                 set_shared_repository(0);
508                                 switch (safe_create_leading_directories_const(argv[0])) {
509                                 case SCLD_OK:
510                                 case SCLD_PERMS:
511                                         break;
512                                 case SCLD_EXISTS:
513                                         errno = EEXIST;
514                                         /* fallthru */
515                                 default:
516                                         die_errno(_("cannot mkdir %s"), argv[0]);
517                                         break;
518                                 }
519                                 set_shared_repository(saved);
520                                 if (mkdir(argv[0], 0777) < 0)
521                                         die_errno(_("cannot mkdir %s"), argv[0]);
522                                 mkdir_tried = 1;
523                                 goto retry;
524                         }
525                         die_errno(_("cannot chdir to %s"), argv[0]);
526                 }
527         } else if (0 < argc) {
528                 usage(init_db_usage[0]);
529         }
530         if (is_bare_repository_cfg == 1) {
531                 char *cwd = xgetcwd();
532                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
533                 free(cwd);
534         }
535
536         if (init_shared_repository != -1)
537                 set_shared_repository(init_shared_repository);
538
539         /*
540          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
541          * without --bare.  Catch the error early.
542          */
543         git_dir = getenv(GIT_DIR_ENVIRONMENT);
544         work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
545         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
546                 die(_("%s (or --work-tree=<directory>) not allowed without "
547                           "specifying %s (or --git-dir=<directory>)"),
548                     GIT_WORK_TREE_ENVIRONMENT,
549                     GIT_DIR_ENVIRONMENT);
550
551         /*
552          * Set up the default .git directory contents
553          */
554         if (!git_dir)
555                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
556
557         if (is_bare_repository_cfg < 0)
558                 is_bare_repository_cfg = guess_repository_type(git_dir);
559
560         if (!is_bare_repository_cfg) {
561                 const char *git_dir_parent = strrchr(git_dir, '/');
562                 if (git_dir_parent) {
563                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
564                         git_work_tree_cfg = real_pathdup(rel, 1);
565                         free(rel);
566                 }
567                 if (!git_work_tree_cfg)
568                         git_work_tree_cfg = xgetcwd();
569                 if (work_tree)
570                         set_git_work_tree(work_tree);
571                 else
572                         set_git_work_tree(git_work_tree_cfg);
573                 if (access(get_git_work_tree(), X_OK))
574                         die_errno (_("Cannot access work tree '%s'"),
575                                    get_git_work_tree());
576         }
577         else {
578                 if (work_tree)
579                         set_git_work_tree(work_tree);
580         }
581
582         flags |= INIT_DB_EXIST_OK;
583         return init_db(git_dir, real_git_dir, template_dir, flags);
584 }