Merge branch 'ls/p4-tmp-refs'
[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 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_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 {
176         struct stat st1;
177         struct strbuf buf = STRBUF_INIT;
178         char *path;
179         char repo_version_string[10];
180         char junk[2];
181         int reinit;
182         int filemode;
183
184         /*
185          * Create .git/refs/{heads,tags}
186          */
187         safe_create_dir(git_path_buf(&buf, "refs"), 1);
188         safe_create_dir(git_path_buf(&buf, "refs/heads"), 1);
189         safe_create_dir(git_path_buf(&buf, "refs/tags"), 1);
190
191         /* Just look for `init.templatedir` */
192         git_config(git_init_db_config, NULL);
193
194         /* First copy the templates -- we might have the default
195          * config file there, in which case we would want to read
196          * from it after installing.
197          */
198         copy_templates(template_path);
199
200         git_config(git_default_config, NULL);
201         is_bare_repository_cfg = init_is_bare_repository;
202
203         /* reading existing config may have overwrote it */
204         if (init_shared_repository != -1)
205                 set_shared_repository(init_shared_repository);
206
207         /*
208          * We would have created the above under user's umask -- under
209          * shared-repository settings, we would need to fix them up.
210          */
211         if (get_shared_repository()) {
212                 adjust_shared_perm(get_git_dir());
213                 adjust_shared_perm(git_path_buf(&buf, "refs"));
214                 adjust_shared_perm(git_path_buf(&buf, "refs/heads"));
215                 adjust_shared_perm(git_path_buf(&buf, "refs/tags"));
216         }
217
218         /*
219          * Create the default symlink from ".git/HEAD" to the "master"
220          * branch, if it does not exist yet.
221          */
222         path = git_path_buf(&buf, "HEAD");
223         reinit = (!access(path, R_OK)
224                   || readlink(path, junk, sizeof(junk)-1) != -1);
225         if (!reinit) {
226                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
227                         exit(1);
228         }
229
230         /* This forces creation of new config file */
231         xsnprintf(repo_version_string, sizeof(repo_version_string),
232                   "%d", GIT_REPO_VERSION);
233         git_config_set("core.repositoryformatversion", repo_version_string);
234
235         /* Check filemode trustability */
236         path = git_path_buf(&buf, "config");
237         filemode = TEST_FILEMODE;
238         if (TEST_FILEMODE && !lstat(path, &st1)) {
239                 struct stat st2;
240                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
241                                 !lstat(path, &st2) &&
242                                 st1.st_mode != st2.st_mode &&
243                                 !chmod(path, st1.st_mode));
244                 if (filemode && !reinit && (st1.st_mode & S_IXUSR))
245                         filemode = 0;
246         }
247         git_config_set("core.filemode", filemode ? "true" : "false");
248
249         if (is_bare_repository())
250                 git_config_set("core.bare", "true");
251         else {
252                 const char *work_tree = get_git_work_tree();
253                 git_config_set("core.bare", "false");
254                 /* allow template config file to override the default */
255                 if (log_all_ref_updates == -1)
256                         git_config_set("core.logallrefupdates", "true");
257                 if (needs_work_tree_config(get_git_dir(), work_tree))
258                         git_config_set("core.worktree", work_tree);
259         }
260
261         if (!reinit) {
262                 /* Check if symlink is supported in the work tree */
263                 path = git_path_buf(&buf, "tXXXXXX");
264                 if (!close(xmkstemp(path)) &&
265                     !unlink(path) &&
266                     !symlink("testing", path) &&
267                     !lstat(path, &st1) &&
268                     S_ISLNK(st1.st_mode))
269                         unlink(path); /* good */
270                 else
271                         git_config_set("core.symlinks", "false");
272
273                 /* Check if the filesystem is case-insensitive */
274                 path = git_path_buf(&buf, "CoNfIg");
275                 if (!access(path, F_OK))
276                         git_config_set("core.ignorecase", "true");
277                 probe_utf8_pathname_composition();
278         }
279
280         strbuf_release(&buf);
281         return reinit;
282 }
283
284 static void create_object_directory(void)
285 {
286         struct strbuf path = STRBUF_INIT;
287         size_t baselen;
288
289         strbuf_addstr(&path, get_object_directory());
290         baselen = path.len;
291
292         safe_create_dir(path.buf, 1);
293
294         strbuf_setlen(&path, baselen);
295         strbuf_addstr(&path, "/pack");
296         safe_create_dir(path.buf, 1);
297
298         strbuf_setlen(&path, baselen);
299         strbuf_addstr(&path, "/info");
300         safe_create_dir(path.buf, 1);
301
302         strbuf_release(&path);
303 }
304
305 int set_git_dir_init(const char *git_dir, const char *real_git_dir,
306                      int exist_ok)
307 {
308         if (real_git_dir) {
309                 struct stat st;
310
311                 if (!exist_ok && !stat(git_dir, &st))
312                         die(_("%s already exists"), git_dir);
313
314                 if (!exist_ok && !stat(real_git_dir, &st))
315                         die(_("%s already exists"), real_git_dir);
316
317                 /*
318                  * make sure symlinks are resolved because we'll be
319                  * moving the target repo later on in separate_git_dir()
320                  */
321                 git_link = xstrdup(real_path(git_dir));
322                 set_git_dir(real_path(real_git_dir));
323         }
324         else {
325                 set_git_dir(real_path(git_dir));
326                 git_link = NULL;
327         }
328         startup_info->have_repository = 1;
329         return 0;
330 }
331
332 static void separate_git_dir(const char *git_dir)
333 {
334         struct stat st;
335
336         if (!stat(git_link, &st)) {
337                 const char *src;
338
339                 if (S_ISREG(st.st_mode))
340                         src = read_gitfile(git_link);
341                 else if (S_ISDIR(st.st_mode))
342                         src = git_link;
343                 else
344                         die(_("unable to handle file type %d"), (int)st.st_mode);
345
346                 if (rename(src, git_dir))
347                         die_errno(_("unable to move %s to %s"), src, git_dir);
348         }
349
350         write_file(git_link, "gitdir: %s", git_dir);
351 }
352
353 int init_db(const char *template_dir, unsigned int flags)
354 {
355         int reinit;
356         const char *git_dir = get_git_dir();
357
358         if (git_link)
359                 separate_git_dir(git_dir);
360
361         safe_create_dir(git_dir, 0);
362
363         init_is_bare_repository = is_bare_repository();
364
365         /* Check to see if the repository version is right.
366          * Note that a newly created repository does not have
367          * config file, so this will not fail.  What we are catching
368          * is an attempt to reinitialize new repository with an old tool.
369          */
370         check_repository_format();
371
372         reinit = create_default_files(template_dir);
373
374         create_object_directory();
375
376         if (get_shared_repository()) {
377                 char buf[10];
378                 /* We do not spell "group" and such, so that
379                  * the configuration can be read by older version
380                  * of git. Note, we use octal numbers for new share modes,
381                  * and compatibility values for PERM_GROUP and
382                  * PERM_EVERYBODY.
383                  */
384                 if (get_shared_repository() < 0)
385                         /* force to the mode value */
386                         xsnprintf(buf, sizeof(buf), "0%o", -get_shared_repository());
387                 else if (get_shared_repository() == PERM_GROUP)
388                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_GROUP);
389                 else if (get_shared_repository() == PERM_EVERYBODY)
390                         xsnprintf(buf, sizeof(buf), "%d", OLD_PERM_EVERYBODY);
391                 else
392                         die("BUG: invalid value for shared_repository");
393                 git_config_set("core.sharedrepository", buf);
394                 git_config_set("receive.denyNonFastforwards", "true");
395         }
396
397         if (!(flags & INIT_DB_QUIET)) {
398                 int len = strlen(git_dir);
399
400                 if (reinit)
401                         printf(get_shared_repository()
402                                ? _("Reinitialized existing shared Git repository in %s%s\n")
403                                : _("Reinitialized existing Git repository in %s%s\n"),
404                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
405                 else
406                         printf(get_shared_repository()
407                                ? _("Initialized empty shared Git repository in %s%s\n")
408                                : _("Initialized empty Git repository in %s%s\n"),
409                                git_dir, len && git_dir[len-1] != '/' ? "/" : "");
410         }
411
412         return 0;
413 }
414
415 static int guess_repository_type(const char *git_dir)
416 {
417         const char *slash;
418         char *cwd;
419         int cwd_is_git_dir;
420
421         /*
422          * "GIT_DIR=. git init" is always bare.
423          * "GIT_DIR=`pwd` git init" too.
424          */
425         if (!strcmp(".", git_dir))
426                 return 1;
427         cwd = xgetcwd();
428         cwd_is_git_dir = !strcmp(git_dir, cwd);
429         free(cwd);
430         if (cwd_is_git_dir)
431                 return 1;
432         /*
433          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
434          */
435         if (!strcmp(git_dir, ".git"))
436                 return 0;
437         slash = strrchr(git_dir, '/');
438         if (slash && !strcmp(slash, "/.git"))
439                 return 0;
440
441         /*
442          * Otherwise it is often bare.  At this point
443          * we are just guessing.
444          */
445         return 1;
446 }
447
448 static int shared_callback(const struct option *opt, const char *arg, int unset)
449 {
450         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
451         return 0;
452 }
453
454 static const char *const init_db_usage[] = {
455         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [<directory>]"),
456         NULL
457 };
458
459 /*
460  * If you want to, you can share the DB area with any number of branches.
461  * That has advantages: you can save space by sharing all the SHA1 objects.
462  * On the other hand, it might just make lookup slower and messier. You
463  * be the judge.  The default case is to have one DB per managed directory.
464  */
465 int cmd_init_db(int argc, const char **argv, const char *prefix)
466 {
467         const char *git_dir;
468         const char *real_git_dir = NULL;
469         const char *work_tree;
470         const char *template_dir = NULL;
471         unsigned int flags = 0;
472         const struct option init_db_options[] = {
473                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
474                                 N_("directory from which templates will be used")),
475                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
476                                 N_("create a bare repository"), 1),
477                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
478                         N_("permissions"),
479                         N_("specify that the git repository is to be shared amongst several users"),
480                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
481                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
482                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
483                            N_("separate git dir from working tree")),
484                 OPT_END()
485         };
486
487         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
488
489         if (real_git_dir && !is_absolute_path(real_git_dir))
490                 real_git_dir = xstrdup(real_path(real_git_dir));
491
492         if (argc == 1) {
493                 int mkdir_tried = 0;
494         retry:
495                 if (chdir(argv[0]) < 0) {
496                         if (!mkdir_tried) {
497                                 int saved;
498                                 /*
499                                  * At this point we haven't read any configuration,
500                                  * and we know shared_repository should always be 0;
501                                  * but just in case we play safe.
502                                  */
503                                 saved = get_shared_repository();
504                                 set_shared_repository(0);
505                                 switch (safe_create_leading_directories_const(argv[0])) {
506                                 case SCLD_OK:
507                                 case SCLD_PERMS:
508                                         break;
509                                 case SCLD_EXISTS:
510                                         errno = EEXIST;
511                                         /* fallthru */
512                                 default:
513                                         die_errno(_("cannot mkdir %s"), argv[0]);
514                                         break;
515                                 }
516                                 set_shared_repository(saved);
517                                 if (mkdir(argv[0], 0777) < 0)
518                                         die_errno(_("cannot mkdir %s"), argv[0]);
519                                 mkdir_tried = 1;
520                                 goto retry;
521                         }
522                         die_errno(_("cannot chdir to %s"), argv[0]);
523                 }
524         } else if (0 < argc) {
525                 usage(init_db_usage[0]);
526         }
527         if (is_bare_repository_cfg == 1) {
528                 char *cwd = xgetcwd();
529                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
530                 free(cwd);
531         }
532
533         if (init_shared_repository != -1)
534                 set_shared_repository(init_shared_repository);
535
536         /*
537          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
538          * without --bare.  Catch the error early.
539          */
540         git_dir = getenv(GIT_DIR_ENVIRONMENT);
541         work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
542         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
543                 die(_("%s (or --work-tree=<directory>) not allowed without "
544                           "specifying %s (or --git-dir=<directory>)"),
545                     GIT_WORK_TREE_ENVIRONMENT,
546                     GIT_DIR_ENVIRONMENT);
547
548         /*
549          * Set up the default .git directory contents
550          */
551         if (!git_dir)
552                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
553
554         if (is_bare_repository_cfg < 0)
555                 is_bare_repository_cfg = guess_repository_type(git_dir);
556
557         if (!is_bare_repository_cfg) {
558                 const char *git_dir_parent = strrchr(git_dir, '/');
559                 if (git_dir_parent) {
560                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
561                         git_work_tree_cfg = xstrdup(real_path(rel));
562                         free(rel);
563                 }
564                 if (!git_work_tree_cfg)
565                         git_work_tree_cfg = xgetcwd();
566                 if (work_tree)
567                         set_git_work_tree(work_tree);
568                 else
569                         set_git_work_tree(git_work_tree_cfg);
570                 if (access(get_git_work_tree(), X_OK))
571                         die_errno (_("Cannot access work tree '%s'"),
572                                    get_git_work_tree());
573         }
574         else {
575                 if (work_tree)
576                         set_git_work_tree(work_tree);
577         }
578
579         set_git_dir_init(git_dir, real_git_dir, 1);
580
581         return init_db(template_dir, flags);
582 }