Merge branch 'tg/range-diff-corner-case-fix'
[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_path,
28                              DIR *dir)
29 {
30         size_t path_baselen = path->len;
31         size_t template_baselen = template_path->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_path, template_baselen);
48
49                 if (de->d_name[0] == '.')
50                         continue;
51                 strbuf_addstr(path, de->d_name);
52                 strbuf_addstr(template_path, 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_path->buf, &st_template))
61                         die_errno(_("cannot stat template '%s'"), template_path->buf);
62
63                 if (S_ISDIR(st_template.st_mode)) {
64                         DIR *subdir = opendir(template_path->buf);
65                         if (!subdir)
66                                 die_errno(_("cannot opendir '%s'"), template_path->buf);
67                         strbuf_addch(path, '/');
68                         strbuf_addch(template_path, '/');
69                         copy_templates_1(path, template_path, 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_path->buf,
77                                             st_template.st_size) < 0)
78                                 die_errno(_("cannot readlink '%s'"), template_path->buf);
79                         if (symlink(lnk.buf, path->buf))
80                                 die_errno(_("cannot symlink '%s' '%s'"),
81                                           lnk.buf, path->buf);
82                         strbuf_release(&lnk);
83                 }
84                 else if (S_ISREG(st_template.st_mode)) {
85                         if (copy_file(path->buf, template_path->buf, st_template.st_mode))
86                                 die_errno(_("cannot copy '%s' to '%s'"),
87                                           template_path->buf, path->buf);
88                 }
89                 else
90                         error(_("ignoring template %s"), template_path->buf);
91         }
92 }
93
94 static void copy_templates(const char *template_dir)
95 {
96         struct strbuf path = STRBUF_INIT;
97         struct strbuf template_path = STRBUF_INIT;
98         size_t template_len;
99         struct repository_format template_format;
100         struct strbuf err = STRBUF_INIT;
101         DIR *dir;
102         char *to_free = NULL;
103
104         if (!template_dir)
105                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
106         if (!template_dir)
107                 template_dir = init_db_template_dir;
108         if (!template_dir)
109                 template_dir = to_free = system_path(DEFAULT_GIT_TEMPLATE_DIR);
110         if (!template_dir[0]) {
111                 free(to_free);
112                 return;
113         }
114
115         strbuf_addstr(&template_path, template_dir);
116         strbuf_complete(&template_path, '/');
117         template_len = template_path.len;
118
119         dir = opendir(template_path.buf);
120         if (!dir) {
121                 warning(_("templates not found in %s"), template_dir);
122                 goto free_return;
123         }
124
125         /* Make sure that template is from the correct vintage */
126         strbuf_addstr(&template_path, "config");
127         read_repository_format(&template_format, template_path.buf);
128         strbuf_setlen(&template_path, template_len);
129
130         /*
131          * No mention of version at all is OK, but anything else should be
132          * verified.
133          */
134         if (template_format.version >= 0 &&
135             verify_repository_format(&template_format, &err) < 0) {
136                 warning(_("not copying templates from '%s': %s"),
137                           template_dir, err.buf);
138                 strbuf_release(&err);
139                 goto close_free_return;
140         }
141
142         strbuf_addstr(&path, get_git_common_dir());
143         strbuf_complete(&path, '/');
144         copy_templates_1(&path, &template_path, dir);
145 close_free_return:
146         closedir(dir);
147 free_return:
148         free(to_free);
149         strbuf_release(&path);
150         strbuf_release(&template_path);
151 }
152
153 static int git_init_db_config(const char *k, const char *v, void *cb)
154 {
155         if (!strcmp(k, "init.templatedir"))
156                 return git_config_pathname(&init_db_template_dir, k, v);
157
158         return 0;
159 }
160
161 /*
162  * If the git_dir is not directly inside the working tree, then git will not
163  * find it by default, and we need to set the worktree explicitly.
164  */
165 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
166 {
167         if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
168                 return 0;
169         if (skip_prefix(git_dir, work_tree, &git_dir) &&
170             !strcmp(git_dir, "/.git"))
171                 return 0;
172         return 1;
173 }
174
175 static int create_default_files(const char *template_path,
176                                 const char *original_git_dir)
177 {
178         struct stat st1;
179         struct strbuf buf = STRBUF_INIT;
180         char *path;
181         char repo_version_string[10];
182         char junk[2];
183         int reinit;
184         int filemode;
185         struct strbuf err = STRBUF_INIT;
186
187         /* Just look for `init.templatedir` */
188         git_config(git_init_db_config, NULL);
189
190         /*
191          * First copy the templates -- we might have the default
192          * config file there, in which case we would want to read
193          * from it after installing.
194          *
195          * Before reading that config, we also need to clear out any cached
196          * values (since we've just potentially changed what's available on
197          * disk).
198          */
199         copy_templates(template_path);
200         git_config_clear();
201         reset_shared_repository();
202         git_config(git_default_config, NULL);
203
204         /*
205          * We must make sure command-line options continue to override any
206          * values we might have just re-read from the config.
207          */
208         is_bare_repository_cfg = init_is_bare_repository;
209         if (init_shared_repository != -1)
210                 set_shared_repository(init_shared_repository);
211
212         /*
213          * We would have created the above under user's umask -- under
214          * shared-repository settings, we would need to fix them up.
215          */
216         if (get_shared_repository()) {
217                 adjust_shared_perm(get_git_dir());
218         }
219
220         /*
221          * We need to create a "refs" dir in any case so that older
222          * versions of git can tell that this is a repository.
223          */
224         safe_create_dir(git_path("refs"), 1);
225         adjust_shared_perm(git_path("refs"));
226
227         if (refs_init_db(&err))
228                 die("failed to set up refs db: %s", err.buf);
229
230         /*
231          * Create the default symlink from ".git/HEAD" to the "master"
232          * branch, if it does not exist yet.
233          */
234         path = git_path_buf(&buf, "HEAD");
235         reinit = (!access(path, R_OK)
236                   || readlink(path, junk, sizeof(junk)-1) != -1);
237         if (!reinit) {
238                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
239                         exit(1);
240         }
241
242         /* This forces creation of new config file */
243         xsnprintf(repo_version_string, sizeof(repo_version_string),
244                   "%d", GIT_REPO_VERSION);
245         git_config_set("core.repositoryformatversion", repo_version_string);
246
247         /* Check filemode trustability */
248         path = git_path_buf(&buf, "config");
249         filemode = TEST_FILEMODE;
250         if (TEST_FILEMODE && !lstat(path, &st1)) {
251                 struct stat st2;
252                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
253                                 !lstat(path, &st2) &&
254                                 st1.st_mode != st2.st_mode &&
255                                 !chmod(path, st1.st_mode));
256                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
257                         filemode = 0;
258         }
259         git_config_set("core.filemode", filemode ? "true" : "false");
260
261         if (is_bare_repository())
262                 git_config_set("core.bare", "true");
263         else {
264                 const char *work_tree = get_git_work_tree();
265                 git_config_set("core.bare", "false");
266                 /* allow template config file to override the default */
267                 if (log_all_ref_updates == LOG_REFS_UNSET)
268                         git_config_set("core.logallrefupdates", "true");
269                 if (needs_work_tree_config(original_git_dir, work_tree))
270                         git_config_set("core.worktree", work_tree);
271         }
272
273         if (!reinit) {
274                 /* Check if symlink is supported in the work tree */
275                 path = git_path_buf(&buf, "tXXXXXX");
276                 if (!close(xmkstemp(path)) &&
277                     !unlink(path) &&
278                     !symlink("testing", path) &&
279                     !lstat(path, &st1) &&
280                     S_ISLNK(st1.st_mode))
281                         unlink(path); /* good */
282                 else
283                         git_config_set("core.symlinks", "false");
284
285                 /* Check if the filesystem is case-insensitive */
286                 path = git_path_buf(&buf, "CoNfIg");
287                 if (!access(path, F_OK))
288                         git_config_set("core.ignorecase", "true");
289                 probe_utf8_pathname_composition();
290         }
291
292         strbuf_release(&buf);
293         return reinit;
294 }
295
296 static void create_object_directory(void)
297 {
298         struct strbuf path = STRBUF_INIT;
299         size_t baselen;
300
301         strbuf_addstr(&path, get_object_directory());
302         baselen = path.len;
303
304         safe_create_dir(path.buf, 1);
305
306         strbuf_setlen(&path, baselen);
307         strbuf_addstr(&path, "/pack");
308         safe_create_dir(path.buf, 1);
309
310         strbuf_setlen(&path, baselen);
311         strbuf_addstr(&path, "/info");
312         safe_create_dir(path.buf, 1);
313
314         strbuf_release(&path);
315 }
316
317 static void separate_git_dir(const char *git_dir, const char *git_link)
318 {
319         struct stat st;
320
321         if (!stat(git_link, &st)) {
322                 const char *src;
323
324                 if (S_ISREG(st.st_mode))
325                         src = read_gitfile(git_link);
326                 else if (S_ISDIR(st.st_mode))
327                         src = git_link;
328                 else
329                         die(_("unable to handle file type %d"), (int)st.st_mode);
330
331                 if (rename(src, git_dir))
332                         die_errno(_("unable to move %s to %s"), src, git_dir);
333         }
334
335         write_file(git_link, "gitdir: %s", git_dir);
336 }
337
338 int init_db(const char *git_dir, const char *real_git_dir,
339             const char *template_dir, unsigned int flags)
340 {
341         int reinit;
342         int exist_ok = flags & INIT_DB_EXIST_OK;
343         char *original_git_dir = real_pathdup(git_dir, 1);
344
345         if (real_git_dir) {
346                 struct stat st;
347
348                 if (!exist_ok && !stat(git_dir, &st))
349                         die(_("%s already exists"), git_dir);
350
351                 if (!exist_ok && !stat(real_git_dir, &st))
352                         die(_("%s already exists"), real_git_dir);
353
354                 set_git_dir(real_path(real_git_dir));
355                 git_dir = get_git_dir();
356                 separate_git_dir(git_dir, original_git_dir);
357         }
358         else {
359                 set_git_dir(real_path(git_dir));
360                 git_dir = get_git_dir();
361         }
362         startup_info->have_repository = 1;
363
364         safe_create_dir(git_dir, 0);
365
366         init_is_bare_repository = is_bare_repository();
367
368         /* Check to see if the repository version is right.
369          * Note that a newly created repository does not have
370          * config file, so this will not fail.  What we are catching
371          * is an attempt to reinitialize new repository with an old tool.
372          */
373         check_repository_format();
374
375         reinit = create_default_files(template_dir, original_git_dir);
376
377         create_object_directory();
378
379         if (get_shared_repository()) {
380                 char buf[10];
381                 /* We do not spell "group" and such, so that
382                  * the configuration can be read by older version
383                  * of git. Note, we use octal numbers for new share modes,
384                  * and compatibility values for PERM_GROUP and
385                  * PERM_EVERYBODY.
386                  */
387                 if (get_shared_repository() < 0)
388                         /* force to the mode value */
389                         xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
390                 else if (get_shared_repository() == PERM_GROUP)
391                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
392                 else if (get_shared_repository() == PERM_EVERYBODY)
393                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
394                 else
395                         BUG("invalid value for shared_repository");
396                 git_config_set("core.sharedrepository", buf);
397                 git_config_set("receive.denyNonFastforwards", "true");
398         }
399
400         if (!(flags & INIT_DB_QUIET)) {
401                 int len = strlen(git_dir);
402
403                 if (reinit)
404                         printf(get_shared_repository()
405                                ? _("Reinitialized existing shared Git repository in %s%s\n")
406                                : _("Reinitialized existing Git repository in %s%s\n"),
407                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
408                 else
409                         printf(get_shared_repository()
410                                ? _("Initialized empty shared Git repository in %s%s\n")
411                                : _("Initialized empty Git repository in %s%s\n"),
412                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
413         }
414
415         free(original_git_dir);
416         return 0;
417 }
418
419 static int guess_repository_type(const char *git_dir)
420 {
421         const char *slash;
422         char *cwd;
423         int cwd_is_git_dir;
424
425         /*
426          * "GIT_DIR=. git init" is always bare.
427          * "GIT_DIR=`pwd` git init" too.
428          */
429         if (!strcmp(".", git_dir))
430                 return 1;
431         cwd = xgetcwd();
432         cwd_is_git_dir = !strcmp(git_dir, cwd);
433         free(cwd);
434         if (cwd_is_git_dir)
435                 return 1;
436         /*
437          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
438          */
439         if (!strcmp(git_dir, ".git"))
440                 return 0;
441         slash = strrchr(git_dir, '/');
442         if (slash && !strcmp(slash, "/.git"))
443                 return 0;
444
445         /*
446          * Otherwise it is often bare.  At this point
447          * we are just guessing.
448          */
449         return 1;
450 }
451
452 static int shared_callback(const struct option *opt, const char *arg, int unset)
453 {
454         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
455         return 0;
456 }
457
458 static const char *const init_db_usage[] = {
459         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
460         NULL
461 };
462
463 /*
464  * If you want to, you can share the DB area with any number of branches.
465  * That has advantages: you can save space by sharing all the SHA1 objects.
466  * On the other hand, it might just make lookup slower and messier. You
467  * be the judge.  The default case is to have one DB per managed directory.
468  */
469 int cmd_init_db(int argc, const char **argv, const char *prefix)
470 {
471         const char *git_dir;
472         const char *real_git_dir = NULL;
473         const char *work_tree;
474         const char *template_dir = NULL;
475         unsigned int flags = 0;
476         const struct option init_db_options[] = {
477                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
478                                 N_("directory from which templates will be used")),
479                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
480                                 N_("create a bare repository"), 1),
481                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
482                         N_("permissions"),
483                         N_("specify that the git repository is to be shared amongst several users"),
484                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
485                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
486                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
487                            N_("separate git dir from working tree")),
488                 OPT_END()
489         };
490
491         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
492
493         if (real_git_dir && !is_absolute_path(real_git_dir))
494                 real_git_dir = real_pathdup(real_git_dir, 1);
495
496         if (argc == 1) {
497                 int mkdir_tried = 0;
498         retry:
499                 if (chdir(argv[0]) < 0) {
500                         if (!mkdir_tried) {
501                                 int saved;
502                                 /*
503                                  * At this point we haven't read any configuration,
504                                  * and we know shared_repository should always be 0;
505                                  * but just in case we play safe.
506                                  */
507                                 saved = get_shared_repository();
508                                 set_shared_repository(0);
509                                 switch (safe_create_leading_directories_const(argv[0])) {
510                                 case SCLD_OK:
511                                 case SCLD_PERMS:
512                                         break;
513                                 case SCLD_EXISTS:
514                                         errno = EEXIST;
515                                         /* fallthru */
516                                 default:
517                                         die_errno(_("cannot mkdir %s"), argv[0]);
518                                         break;
519                                 }
520                                 set_shared_repository(saved);
521                                 if (mkdir(argv[0], 0777) < 0)
522                                         die_errno(_("cannot mkdir %s"), argv[0]);
523                                 mkdir_tried = 1;
524                                 goto retry;
525                         }
526                         die_errno(_("cannot chdir to %s"), argv[0]);
527                 }
528         } else if (0 < argc) {
529                 usage(init_db_usage[0]);
530         }
531         if (is_bare_repository_cfg == 1) {
532                 char *cwd = xgetcwd();
533                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
534                 free(cwd);
535         }
536
537         if (init_shared_repository != -1)
538                 set_shared_repository(init_shared_repository);
539
540         /*
541          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
542          * without --bare.  Catch the error early.
543          */
544         git_dir = getenv(GIT_DIR_ENVIRONMENT);
545         work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
546         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
547                 die(_("%s (or --work-tree=<directory>) not allowed without "
548                           "specifying %s (or --git-dir=<directory>)"),
549                     GIT_WORK_TREE_ENVIRONMENT,
550                     GIT_DIR_ENVIRONMENT);
551
552         /*
553          * Set up the default .git directory contents
554          */
555         if (!git_dir)
556                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
557
558         if (is_bare_repository_cfg < 0)
559                 is_bare_repository_cfg = guess_repository_type(git_dir);
560
561         if (!is_bare_repository_cfg) {
562                 const char *git_dir_parent = strrchr(git_dir, '/');
563                 if (git_dir_parent) {
564                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
565                         git_work_tree_cfg = real_pathdup(rel, 1);
566                         free(rel);
567                 }
568                 if (!git_work_tree_cfg)
569                         git_work_tree_cfg = xgetcwd();
570                 if (work_tree)
571                         set_git_work_tree(work_tree);
572                 else
573                         set_git_work_tree(git_work_tree_cfg);
574                 if (access(get_git_work_tree(), X_OK))
575                         die_errno (_("Cannot access work tree '%s'"),
576                                    get_git_work_tree());
577         }
578         else {
579                 if (work_tree)
580                         set_git_work_tree(work_tree);
581         }
582
583         UNLEAK(real_git_dir);
584
585         flags |= INIT_DB_EXIST_OK;
586         return init_db(git_dir, real_git_dir, template_dir, flags);
587 }