Merge branch 'da/smerge'
[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 = REPOSITORY_FORMAT_INIT;
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         clear_repository_format(&template_format);
152 }
153
154 static int git_init_db_config(const char *k, const char *v, void *cb)
155 {
156         if (!strcmp(k, "init.templatedir"))
157                 return git_config_pathname(&init_db_template_dir, k, v);
158
159         if (starts_with(k, "core."))
160                 return platform_core_config(k, v, cb);
161
162         return 0;
163 }
164
165 /*
166  * If the git_dir is not directly inside the working tree, then git will not
167  * find it by default, and we need to set the worktree explicitly.
168  */
169 static int needs_work_tree_config(const char *git_dir, const char *work_tree)
170 {
171         if (!strcmp(work_tree, "/") && !strcmp(git_dir, "/.git"))
172                 return 0;
173         if (skip_prefix(git_dir, work_tree, &git_dir) &&
174             !strcmp(git_dir, "/.git"))
175                 return 0;
176         return 1;
177 }
178
179 static int create_default_files(const char *template_path,
180                                 const char *original_git_dir)
181 {
182         struct stat st1;
183         struct strbuf buf = STRBUF_INIT;
184         char *path;
185         char repo_version_string[10];
186         char junk[2];
187         int reinit;
188         int filemode;
189         struct strbuf err = STRBUF_INIT;
190
191         /* Just look for `init.templatedir` */
192         init_db_template_dir = NULL; /* re-set in case it was set before */
193         git_config(git_init_db_config, NULL);
194
195         /*
196          * First copy the templates -- we might have the default
197          * config file there, in which case we would want to read
198          * from it after installing.
199          *
200          * Before reading that config, we also need to clear out any cached
201          * values (since we've just potentially changed what's available on
202          * disk).
203          */
204         copy_templates(template_path);
205         git_config_clear();
206         reset_shared_repository();
207         git_config(git_default_config, NULL);
208
209         /*
210          * We must make sure command-line options continue to override any
211          * values we might have just re-read from the config.
212          */
213         is_bare_repository_cfg = init_is_bare_repository;
214         if (init_shared_repository != -1)
215                 set_shared_repository(init_shared_repository);
216
217         /*
218          * We would have created the above under user's umask -- under
219          * shared-repository settings, we would need to fix them up.
220          */
221         if (get_shared_repository()) {
222                 adjust_shared_perm(get_git_dir());
223         }
224
225         /*
226          * We need to create a "refs" dir in any case so that older
227          * versions of git can tell that this is a repository.
228          */
229         safe_create_dir(git_path("refs"), 1);
230         adjust_shared_perm(git_path("refs"));
231
232         if (refs_init_db(&err))
233                 die("failed to set up refs db: %s", err.buf);
234
235         /*
236          * Create the default symlink from ".git/HEAD" to the "master"
237          * branch, if it does not exist yet.
238          */
239         path = git_path_buf(&buf, "HEAD");
240         reinit = (!access(path, R_OK)
241                   || readlink(path, junk, sizeof(junk)-1) != -1);
242         if (!reinit) {
243                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
244                         exit(1);
245         }
246
247         /* This forces creation of new config file */
248         xsnprintf(repo_version_string, sizeof(repo_version_string),
249                   "%d", GIT_REPO_VERSION);
250         git_config_set("core.repositoryformatversion", repo_version_string);
251
252         /* Check filemode trustability */
253         path = git_path_buf(&buf, "config");
254         filemode = TEST_FILEMODE;
255         if (TEST_FILEMODE && !lstat(path, &st1)) {
256                 struct stat st2;
257                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
258                                 !lstat(path, &st2) &&
259                                 st1.st_mode != st2.st_mode &&
260                                 !chmod(path, st1.st_mode));
261                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
262                         filemode = 0;
263         }
264         git_config_set("core.filemode", filemode ? "true" : "false");
265
266         if (is_bare_repository())
267                 git_config_set("core.bare", "true");
268         else {
269                 const char *work_tree = get_git_work_tree();
270                 git_config_set("core.bare", "false");
271                 /* allow template config file to override the default */
272                 if (log_all_ref_updates == LOG_REFS_UNSET)
273                         git_config_set("core.logallrefupdates", "true");
274                 if (needs_work_tree_config(original_git_dir, work_tree))
275                         git_config_set("core.worktree", work_tree);
276         }
277
278         if (!reinit) {
279                 /* Check if symlink is supported in the work tree */
280                 path = git_path_buf(&buf, "tXXXXXX");
281                 if (!close(xmkstemp(path)) &&
282                     !unlink(path) &&
283                     !symlink("testing", path) &&
284                     !lstat(path, &st1) &&
285                     S_ISLNK(st1.st_mode))
286                         unlink(path); /* good */
287                 else
288                         git_config_set("core.symlinks", "false");
289
290                 /* Check if the filesystem is case-insensitive */
291                 path = git_path_buf(&buf, "CoNfIg");
292                 if (!access(path, F_OK))
293                         git_config_set("core.ignorecase", "true");
294                 probe_utf8_pathname_composition();
295         }
296
297         strbuf_release(&buf);
298         return reinit;
299 }
300
301 static void create_object_directory(void)
302 {
303         struct strbuf path = STRBUF_INIT;
304         size_t baselen;
305
306         strbuf_addstr(&path, get_object_directory());
307         baselen = path.len;
308
309         safe_create_dir(path.buf, 1);
310
311         strbuf_setlen(&path, baselen);
312         strbuf_addstr(&path, "/pack");
313         safe_create_dir(path.buf, 1);
314
315         strbuf_setlen(&path, baselen);
316         strbuf_addstr(&path, "/info");
317         safe_create_dir(path.buf, 1);
318
319         strbuf_release(&path);
320 }
321
322 static void separate_git_dir(const char *git_dir, const char *git_link)
323 {
324         struct stat st;
325
326         if (!stat(git_link, &st)) {
327                 const char *src;
328
329                 if (S_ISREG(st.st_mode))
330                         src = read_gitfile(git_link);
331                 else if (S_ISDIR(st.st_mode))
332                         src = git_link;
333                 else
334                         die(_("unable to handle file type %d"), (int)st.st_mode);
335
336                 if (rename(src, git_dir))
337                         die_errno(_("unable to move %s to %s"), src, git_dir);
338         }
339
340         write_file(git_link, "gitdir: %s", git_dir);
341 }
342
343 int init_db(const char *git_dir, const char *real_git_dir,
344             const char *template_dir, unsigned int flags)
345 {
346         int reinit;
347         int exist_ok = flags & INIT_DB_EXIST_OK;
348         char *original_git_dir = real_pathdup(git_dir, 1);
349
350         if (real_git_dir) {
351                 struct stat st;
352
353                 if (!exist_ok && !stat(git_dir, &st))
354                         die(_("%s already exists"), git_dir);
355
356                 if (!exist_ok && !stat(real_git_dir, &st))
357                         die(_("%s already exists"), real_git_dir);
358
359                 set_git_dir(real_path(real_git_dir));
360                 git_dir = get_git_dir();
361                 separate_git_dir(git_dir, original_git_dir);
362         }
363         else {
364                 set_git_dir(real_path(git_dir));
365                 git_dir = get_git_dir();
366         }
367         startup_info->have_repository = 1;
368
369         /* Just look for `core.hidedotfiles` */
370         git_config(git_init_db_config, NULL);
371
372         safe_create_dir(git_dir, 0);
373
374         init_is_bare_repository = is_bare_repository();
375
376         /* Check to see if the repository version is right.
377          * Note that a newly created repository does not have
378          * config file, so this will not fail.  What we are catching
379          * is an attempt to reinitialize new repository with an old tool.
380          */
381         check_repository_format();
382
383         reinit = create_default_files(template_dir, original_git_dir);
384
385         create_object_directory();
386
387         if (get_shared_repository()) {
388                 char buf[10];
389                 /* We do not spell "group" and such, so that
390                  * the configuration can be read by older version
391                  * of git. Note, we use octal numbers for new share modes,
392                  * and compatibility values for PERM_GROUP and
393                  * PERM_EVERYBODY.
394                  */
395                 if (get_shared_repository() < 0)
396                         /* force to the mode value */
397                         xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
398                 else if (get_shared_repository() == PERM_GROUP)
399                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
400                 else if (get_shared_repository() == PERM_EVERYBODY)
401                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
402                 else
403                         BUG("invalid value for shared_repository");
404                 git_config_set("core.sharedrepository", buf);
405                 git_config_set("receive.denyNonFastforwards", "true");
406         }
407
408         if (!(flags & INIT_DB_QUIET)) {
409                 int len = strlen(git_dir);
410
411                 if (reinit)
412                         printf(get_shared_repository()
413                                ? _("Reinitialized existing shared Git repository in %s%s\n")
414                                : _("Reinitialized existing Git repository in %s%s\n"),
415                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
416                 else
417                         printf(get_shared_repository()
418                                ? _("Initialized empty shared Git repository in %s%s\n")
419                                : _("Initialized empty Git repository in %s%s\n"),
420                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
421         }
422
423         free(original_git_dir);
424         return 0;
425 }
426
427 static int guess_repository_type(const char *git_dir)
428 {
429         const char *slash;
430         char *cwd;
431         int cwd_is_git_dir;
432
433         /*
434          * "GIT_DIR=. git init" is always bare.
435          * "GIT_DIR=`pwd` git init" too.
436          */
437         if (!strcmp(".", git_dir))
438                 return 1;
439         cwd = xgetcwd();
440         cwd_is_git_dir = !strcmp(git_dir, cwd);
441         free(cwd);
442         if (cwd_is_git_dir)
443                 return 1;
444         /*
445          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
446          */
447         if (!strcmp(git_dir, ".git"))
448                 return 0;
449         slash = strrchr(git_dir, '/');
450         if (slash && !strcmp(slash, "/.git"))
451                 return 0;
452
453         /*
454          * Otherwise it is often bare.  At this point
455          * we are just guessing.
456          */
457         return 1;
458 }
459
460 static int shared_callback(const struct option *opt, const char *arg, int unset)
461 {
462         BUG_ON_OPT_NEG(unset);
463         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
464         return 0;
465 }
466
467 static const char *const init_db_usage[] = {
468         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
469         NULL
470 };
471
472 /*
473  * If you want to, you can share the DB area with any number of branches.
474  * That has advantages: you can save space by sharing all the SHA1 objects.
475  * On the other hand, it might just make lookup slower and messier. You
476  * be the judge.  The default case is to have one DB per managed directory.
477  */
478 int cmd_init_db(int argc, const char **argv, const char *prefix)
479 {
480         const char *git_dir;
481         const char *real_git_dir = NULL;
482         const char *work_tree;
483         const char *template_dir = NULL;
484         unsigned int flags = 0;
485         const struct option init_db_options[] = {
486                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
487                                 N_("directory from which templates will be used")),
488                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
489                                 N_("create a bare repository"), 1),
490                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
491                         N_("permissions"),
492                         N_("specify that the git repository is to be shared amongst several users"),
493                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
494                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
495                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
496                            N_("separate git dir from working tree")),
497                 OPT_END()
498         };
499
500         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
501
502         if (real_git_dir && !is_absolute_path(real_git_dir))
503                 real_git_dir = real_pathdup(real_git_dir, 1);
504
505         if (argc == 1) {
506                 int mkdir_tried = 0;
507         retry:
508                 if (chdir(argv[0]) < 0) {
509                         if (!mkdir_tried) {
510                                 int saved;
511                                 /*
512                                  * At this point we haven't read any configuration,
513                                  * and we know shared_repository should always be 0;
514                                  * but just in case we play safe.
515                                  */
516                                 saved = get_shared_repository();
517                                 set_shared_repository(0);
518                                 switch (safe_create_leading_directories_const(argv[0])) {
519                                 case SCLD_OK:
520                                 case SCLD_PERMS:
521                                         break;
522                                 case SCLD_EXISTS:
523                                         errno = EEXIST;
524                                         /* fallthru */
525                                 default:
526                                         die_errno(_("cannot mkdir %s"), argv[0]);
527                                         break;
528                                 }
529                                 set_shared_repository(saved);
530                                 if (mkdir(argv[0], 0777) < 0)
531                                         die_errno(_("cannot mkdir %s"), argv[0]);
532                                 mkdir_tried = 1;
533                                 goto retry;
534                         }
535                         die_errno(_("cannot chdir to %s"), argv[0]);
536                 }
537         } else if (0 < argc) {
538                 usage(init_db_usage[0]);
539         }
540         if (is_bare_repository_cfg == 1) {
541                 char *cwd = xgetcwd();
542                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
543                 free(cwd);
544         }
545
546         if (init_shared_repository != -1)
547                 set_shared_repository(init_shared_repository);
548
549         /*
550          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
551          * without --bare.  Catch the error early.
552          */
553         git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
554         work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
555         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
556                 die(_("%s (or --work-tree=<directory>) not allowed without "
557                           "specifying %s (or --git-dir=<directory>)"),
558                     GIT_WORK_TREE_ENVIRONMENT,
559                     GIT_DIR_ENVIRONMENT);
560
561         /*
562          * Set up the default .git directory contents
563          */
564         if (!git_dir)
565                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
566
567         if (is_bare_repository_cfg < 0)
568                 is_bare_repository_cfg = guess_repository_type(git_dir);
569
570         if (!is_bare_repository_cfg) {
571                 const char *git_dir_parent = strrchr(git_dir, '/');
572                 if (git_dir_parent) {
573                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
574                         git_work_tree_cfg = real_pathdup(rel, 1);
575                         free(rel);
576                 }
577                 if (!git_work_tree_cfg)
578                         git_work_tree_cfg = xgetcwd();
579                 if (work_tree)
580                         set_git_work_tree(work_tree);
581                 else
582                         set_git_work_tree(git_work_tree_cfg);
583                 if (access(get_git_work_tree(), X_OK))
584                         die_errno (_("Cannot access work tree '%s'"),
585                                    get_git_work_tree());
586         }
587         else {
588                 if (work_tree)
589                         set_git_work_tree(work_tree);
590         }
591
592         UNLEAK(real_git_dir);
593         UNLEAK(git_dir);
594         UNLEAK(work_tree);
595
596         flags |= INIT_DB_EXIST_OK;
597         return init_db(git_dir, real_git_dir, template_dir, flags);
598 }