Merge early parts from git://ozlabs.org/~paulus/gitk.git
[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 "builtin.h"
8 #include "exec_cmd.h"
9 #include "parse-options.h"
10
11 #ifndef DEFAULT_GIT_TEMPLATE_DIR
12 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
13 #endif
14
15 #ifdef NO_TRUSTABLE_FILEMODE
16 #define TEST_FILEMODE 0
17 #else
18 #define TEST_FILEMODE 1
19 #endif
20
21 static int init_is_bare_repository = 0;
22 static int init_shared_repository = -1;
23 static const char *init_db_template_dir;
24 static const char *git_link;
25
26 static void safe_create_dir(const char *dir, int share)
27 {
28         if (mkdir(dir, 0777) < 0) {
29                 if (errno != EEXIST) {
30                         perror(dir);
31                         exit(1);
32                 }
33         }
34         else if (share && adjust_shared_perm(dir))
35                 die(_("Could not make %s writable by group"), dir);
36 }
37
38 static void copy_templates_1(char *path, int baselen,
39                              char *template, int template_baselen,
40                              DIR *dir)
41 {
42         struct dirent *de;
43
44         /* Note: if ".git/hooks" file exists in the repository being
45          * re-initialized, /etc/core-git/templates/hooks/update would
46          * cause "git init" to fail here.  I think this is sane but
47          * it means that the set of templates we ship by default, along
48          * with the way the namespace under .git/ is organized, should
49          * be really carefully chosen.
50          */
51         safe_create_dir(path, 1);
52         while ((de = readdir(dir)) != NULL) {
53                 struct stat st_git, st_template;
54                 int namelen;
55                 int exists = 0;
56
57                 if (de->d_name[0] == '.')
58                         continue;
59                 namelen = strlen(de->d_name);
60                 if ((PATH_MAX <= baselen + namelen) ||
61                     (PATH_MAX <= template_baselen + namelen))
62                         die(_("insanely long template name %s"), de->d_name);
63                 memcpy(path + baselen, de->d_name, namelen+1);
64                 memcpy(template + template_baselen, de->d_name, namelen+1);
65                 if (lstat(path, &st_git)) {
66                         if (errno != ENOENT)
67                                 die_errno(_("cannot stat '%s'"), path);
68                 }
69                 else
70                         exists = 1;
71
72                 if (lstat(template, &st_template))
73                         die_errno(_("cannot stat template '%s'"), template);
74
75                 if (S_ISDIR(st_template.st_mode)) {
76                         DIR *subdir = opendir(template);
77                         int baselen_sub = baselen + namelen;
78                         int template_baselen_sub = template_baselen + namelen;
79                         if (!subdir)
80                                 die_errno(_("cannot opendir '%s'"), template);
81                         path[baselen_sub++] =
82                                 template[template_baselen_sub++] = '/';
83                         path[baselen_sub] =
84                                 template[template_baselen_sub] = 0;
85                         copy_templates_1(path, baselen_sub,
86                                          template, template_baselen_sub,
87                                          subdir);
88                         closedir(subdir);
89                 }
90                 else if (exists)
91                         continue;
92                 else if (S_ISLNK(st_template.st_mode)) {
93                         char lnk[256];
94                         int len;
95                         len = readlink(template, lnk, sizeof(lnk));
96                         if (len < 0)
97                                 die_errno(_("cannot readlink '%s'"), template);
98                         if (sizeof(lnk) <= len)
99                                 die(_("insanely long symlink %s"), template);
100                         lnk[len] = 0;
101                         if (symlink(lnk, path))
102                                 die_errno(_("cannot symlink '%s' '%s'"), lnk, path);
103                 }
104                 else if (S_ISREG(st_template.st_mode)) {
105                         if (copy_file(path, template, st_template.st_mode))
106                                 die_errno(_("cannot copy '%s' to '%s'"), template,
107                                           path);
108                 }
109                 else
110                         error(_("ignoring template %s"), template);
111         }
112 }
113
114 static void copy_templates(const char *template_dir)
115 {
116         char path[PATH_MAX];
117         char template_path[PATH_MAX];
118         int template_len;
119         DIR *dir;
120         const char *git_dir = get_git_dir();
121         int len = strlen(git_dir);
122
123         if (!template_dir)
124                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
125         if (!template_dir)
126                 template_dir = init_db_template_dir;
127         if (!template_dir)
128                 template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
129         if (!template_dir[0])
130                 return;
131         template_len = strlen(template_dir);
132         if (PATH_MAX <= (template_len+strlen("/config")))
133                 die(_("insanely long template path %s"), template_dir);
134         strcpy(template_path, template_dir);
135         if (template_path[template_len-1] != '/') {
136                 template_path[template_len++] = '/';
137                 template_path[template_len] = 0;
138         }
139         dir = opendir(template_path);
140         if (!dir) {
141                 warning(_("templates not found %s"), template_dir);
142                 return;
143         }
144
145         /* Make sure that template is from the correct vintage */
146         strcpy(template_path + template_len, "config");
147         repository_format_version = 0;
148         git_config_from_file(check_repository_format_version,
149                              template_path, NULL);
150         template_path[template_len] = 0;
151
152         if (repository_format_version &&
153             repository_format_version != GIT_REPO_VERSION) {
154                 warning(_("not copying templates of "
155                         "a wrong format version %d from '%s'"),
156                         repository_format_version,
157                         template_dir);
158                 closedir(dir);
159                 return;
160         }
161
162         memcpy(path, git_dir, len);
163         if (len && path[len - 1] != '/')
164                 path[len++] = '/';
165         path[len] = 0;
166         copy_templates_1(path, len,
167                          template_path, template_len,
168                          dir);
169         closedir(dir);
170 }
171
172 static int git_init_db_config(const char *k, const char *v, void *cb)
173 {
174         if (!strcmp(k, "init.templatedir"))
175                 return git_config_pathname(&init_db_template_dir, k, v);
176
177         return 0;
178 }
179
180 static int create_default_files(const char *template_path)
181 {
182         const char *git_dir = get_git_dir();
183         unsigned len = strlen(git_dir);
184         static char path[PATH_MAX];
185         struct stat st1;
186         char repo_version_string[10];
187         char junk[2];
188         int reinit;
189         int filemode;
190
191         if (len > sizeof(path)-50)
192                 die(_("insane git directory %s"), git_dir);
193         memcpy(path, git_dir, len);
194
195         if (len && path[len-1] != '/')
196                 path[len++] = '/';
197
198         /*
199          * Create .git/refs/{heads,tags}
200          */
201         safe_create_dir(git_path("refs"), 1);
202         safe_create_dir(git_path("refs/heads"), 1);
203         safe_create_dir(git_path("refs/tags"), 1);
204
205         /* Just look for `init.templatedir` */
206         git_config(git_init_db_config, NULL);
207
208         /* First copy the templates -- we might have the default
209          * config file there, in which case we would want to read
210          * from it after installing.
211          */
212         copy_templates(template_path);
213
214         git_config(git_default_config, NULL);
215         is_bare_repository_cfg = init_is_bare_repository;
216
217         /* reading existing config may have overwrote it */
218         if (init_shared_repository != -1)
219                 shared_repository = init_shared_repository;
220
221         /*
222          * We would have created the above under user's umask -- under
223          * shared-repository settings, we would need to fix them up.
224          */
225         if (shared_repository) {
226                 adjust_shared_perm(get_git_dir());
227                 adjust_shared_perm(git_path("refs"));
228                 adjust_shared_perm(git_path("refs/heads"));
229                 adjust_shared_perm(git_path("refs/tags"));
230         }
231
232         /*
233          * Create the default symlink from ".git/HEAD" to the "master"
234          * branch, if it does not exist yet.
235          */
236         strcpy(path + len, "HEAD");
237         reinit = (!access(path, R_OK)
238                   || readlink(path, junk, sizeof(junk)-1) != -1);
239         if (!reinit) {
240                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
241                         exit(1);
242         }
243
244         /* This forces creation of new config file */
245         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
246         git_config_set("core.repositoryformatversion", repo_version_string);
247
248         path[len] = 0;
249         strcpy(path + len, "config");
250
251         /* Check filemode trustability */
252         filemode = TEST_FILEMODE;
253         if (TEST_FILEMODE && !lstat(path, &st1)) {
254                 struct stat st2;
255                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
256                                 !lstat(path, &st2) &&
257                                 st1.st_mode != st2.st_mode);
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 == -1)
268                     git_config_set("core.logallrefupdates", "true");
269                 if (!starts_with(git_dir, work_tree) ||
270                     strcmp(git_dir + strlen(work_tree), "/.git")) {
271                         git_config_set("core.worktree", work_tree);
272                 }
273         }
274
275         if (!reinit) {
276                 /* Check if symlink is supported in the work tree */
277                 path[len] = 0;
278                 strcpy(path + len, "tXXXXXX");
279                 if (!close(xmkstemp(path)) &&
280                     !unlink(path) &&
281                     !symlink("testing", path) &&
282                     !lstat(path, &st1) &&
283                     S_ISLNK(st1.st_mode))
284                         unlink(path); /* good */
285                 else
286                         git_config_set("core.symlinks", "false");
287
288                 /* Check if the filesystem is case-insensitive */
289                 path[len] = 0;
290                 strcpy(path + len, "CoNfIg");
291                 if (!access(path, F_OK))
292                         git_config_set("core.ignorecase", "true");
293                 probe_utf8_pathname_composition(path, len);
294         }
295
296         return reinit;
297 }
298
299 static void create_object_directory(void)
300 {
301         const char *object_directory = get_object_directory();
302         int len = strlen(object_directory);
303         char *path = xmalloc(len + 40);
304
305         memcpy(path, object_directory, len);
306
307         safe_create_dir(object_directory, 1);
308         strcpy(path+len, "/pack");
309         safe_create_dir(path, 1);
310         strcpy(path+len, "/info");
311         safe_create_dir(path, 1);
312
313         free(path);
314 }
315
316 int set_git_dir_init(const char *git_dir, const char *real_git_dir,
317                      int exist_ok)
318 {
319         if (real_git_dir) {
320                 struct stat st;
321
322                 if (!exist_ok && !stat(git_dir, &st))
323                         die(_("%s already exists"), git_dir);
324
325                 if (!exist_ok && !stat(real_git_dir, &st))
326                         die(_("%s already exists"), real_git_dir);
327
328                 /*
329                  * make sure symlinks are resolved because we'll be
330                  * moving the target repo later on in separate_git_dir()
331                  */
332                 git_link = xstrdup(real_path(git_dir));
333         }
334         else {
335                 real_git_dir = real_path(git_dir);
336                 git_link = NULL;
337         }
338         set_git_dir(real_path(real_git_dir));
339         return 0;
340 }
341
342 static void separate_git_dir(const char *git_dir)
343 {
344         struct stat st;
345         FILE *fp;
346
347         if (!stat(git_link, &st)) {
348                 const char *src;
349
350                 if (S_ISREG(st.st_mode))
351                         src = read_gitfile(git_link);
352                 else if (S_ISDIR(st.st_mode))
353                         src = git_link;
354                 else
355                         die(_("unable to handle file type %d"), (int)st.st_mode);
356
357                 if (rename(src, git_dir))
358                         die_errno(_("unable to move %s to %s"), src, git_dir);
359         }
360
361         fp = fopen(git_link, "w");
362         if (!fp)
363                 die(_("Could not create git link %s"), git_link);
364         fprintf(fp, "gitdir: %s\n", git_dir);
365         fclose(fp);
366 }
367
368 int init_db(const char *template_dir, unsigned int flags)
369 {
370         int reinit;
371         const char *git_dir = get_git_dir();
372
373         if (git_link)
374                 separate_git_dir(git_dir);
375
376         safe_create_dir(git_dir, 0);
377
378         init_is_bare_repository = is_bare_repository();
379
380         /* Check to see if the repository version is right.
381          * Note that a newly created repository does not have
382          * config file, so this will not fail.  What we are catching
383          * is an attempt to reinitialize new repository with an old tool.
384          */
385         check_repository_format();
386
387         reinit = create_default_files(template_dir);
388
389         create_object_directory();
390
391         if (shared_repository) {
392                 char buf[10];
393                 /* We do not spell "group" and such, so that
394                  * the configuration can be read by older version
395                  * of git. Note, we use octal numbers for new share modes,
396                  * and compatibility values for PERM_GROUP and
397                  * PERM_EVERYBODY.
398                  */
399                 if (shared_repository < 0)
400                         /* force to the mode value */
401                         sprintf(buf, "0%o", -shared_repository);
402                 else if (shared_repository == PERM_GROUP)
403                         sprintf(buf, "%d", OLD_PERM_GROUP);
404                 else if (shared_repository == PERM_EVERYBODY)
405                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
406                 else
407                         die("oops");
408                 git_config_set("core.sharedrepository", buf);
409                 git_config_set("receive.denyNonFastforwards", "true");
410         }
411
412         if (!(flags & INIT_DB_QUIET)) {
413                 int len = strlen(git_dir);
414
415                 /* TRANSLATORS: The first '%s' is either "Reinitialized
416                    existing" or "Initialized empty", the second " shared" or
417                    "", and the last '%s%s' is the verbatim directory name. */
418                 printf(_("%s%s Git repository in %s%s\n"),
419                        reinit ? _("Reinitialized existing") : _("Initialized empty"),
420                        shared_repository ? _(" shared") : "",
421                        git_dir, len && git_dir[len-1] != '/' ? "/" : "");
422         }
423
424         return 0;
425 }
426
427 static int guess_repository_type(const char *git_dir)
428 {
429         char cwd[PATH_MAX];
430         const char *slash;
431
432         /*
433          * "GIT_DIR=. git init" is always bare.
434          * "GIT_DIR=`pwd` git init" too.
435          */
436         if (!strcmp(".", git_dir))
437                 return 1;
438         if (!getcwd(cwd, sizeof(cwd)))
439                 die_errno(_("cannot tell cwd"));
440         if (!strcmp(git_dir, cwd))
441                 return 1;
442         /*
443          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
444          */
445         if (!strcmp(git_dir, ".git"))
446                 return 0;
447         slash = strrchr(git_dir, '/');
448         if (slash && !strcmp(slash, "/.git"))
449                 return 0;
450
451         /*
452          * Otherwise it is often bare.  At this point
453          * we are just guessing.
454          */
455         return 1;
456 }
457
458 static int shared_callback(const struct option *opt, const char *arg, int unset)
459 {
460         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
461         return 0;
462 }
463
464 static const char *const init_db_usage[] = {
465         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]"),
466         NULL
467 };
468
469 /*
470  * If you want to, you can share the DB area with any number of branches.
471  * That has advantages: you can save space by sharing all the SHA1 objects.
472  * On the other hand, it might just make lookup slower and messier. You
473  * be the judge.  The default case is to have one DB per managed directory.
474  */
475 int cmd_init_db(int argc, const char **argv, const char *prefix)
476 {
477         const char *git_dir;
478         const char *real_git_dir = NULL;
479         const char *work_tree;
480         const char *template_dir = NULL;
481         unsigned int flags = 0;
482         const struct option init_db_options[] = {
483                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
484                                 N_("directory from which templates will be used")),
485                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
486                                 N_("create a bare repository"), 1),
487                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
488                         N_("permissions"),
489                         N_("specify that the git repository is to be shared amongst several users"),
490                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
491                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
492                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
493                            N_("separate git dir from working tree")),
494                 OPT_END()
495         };
496
497         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
498
499         if (real_git_dir && !is_absolute_path(real_git_dir))
500                 real_git_dir = xstrdup(real_path(real_git_dir));
501
502         if (argc == 1) {
503                 int mkdir_tried = 0;
504         retry:
505                 if (chdir(argv[0]) < 0) {
506                         if (!mkdir_tried) {
507                                 int saved;
508                                 /*
509                                  * At this point we haven't read any configuration,
510                                  * and we know shared_repository should always be 0;
511                                  * but just in case we play safe.
512                                  */
513                                 saved = shared_repository;
514                                 shared_repository = 0;
515                                 switch (safe_create_leading_directories_const(argv[0])) {
516                                 case SCLD_OK:
517                                 case SCLD_PERMS:
518                                         break;
519                                 case SCLD_EXISTS:
520                                         errno = EEXIST;
521                                         /* fallthru */
522                                 default:
523                                         die_errno(_("cannot mkdir %s"), argv[0]);
524                                         break;
525                                 }
526                                 shared_repository = saved;
527                                 if (mkdir(argv[0], 0777) < 0)
528                                         die_errno(_("cannot mkdir %s"), argv[0]);
529                                 mkdir_tried = 1;
530                                 goto retry;
531                         }
532                         die_errno(_("cannot chdir to %s"), argv[0]);
533                 }
534         } else if (0 < argc) {
535                 usage(init_db_usage[0]);
536         }
537         if (is_bare_repository_cfg == 1) {
538                 static char git_dir[PATH_MAX+1];
539
540                 setenv(GIT_DIR_ENVIRONMENT,
541                         getcwd(git_dir, sizeof(git_dir)), argc > 0);
542         }
543
544         if (init_shared_repository != -1)
545                 shared_repository = init_shared_repository;
546
547         /*
548          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
549          * without --bare.  Catch the error early.
550          */
551         git_dir = getenv(GIT_DIR_ENVIRONMENT);
552         work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
553         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
554                 die(_("%s (or --work-tree=<directory>) not allowed without "
555                           "specifying %s (or --git-dir=<directory>)"),
556                     GIT_WORK_TREE_ENVIRONMENT,
557                     GIT_DIR_ENVIRONMENT);
558
559         /*
560          * Set up the default .git directory contents
561          */
562         if (!git_dir)
563                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
564
565         if (is_bare_repository_cfg < 0)
566                 is_bare_repository_cfg = guess_repository_type(git_dir);
567
568         if (!is_bare_repository_cfg) {
569                 const char *git_dir_parent = strrchr(git_dir, '/');
570                 if (git_dir_parent) {
571                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
572                         git_work_tree_cfg = xstrdup(real_path(rel));
573                         free(rel);
574                 }
575                 if (!git_work_tree_cfg) {
576                         git_work_tree_cfg = xcalloc(PATH_MAX, 1);
577                         if (!getcwd(git_work_tree_cfg, PATH_MAX))
578                                 die_errno (_("Cannot access current working directory"));
579                 }
580                 if (work_tree)
581                         set_git_work_tree(real_path(work_tree));
582                 else
583                         set_git_work_tree(git_work_tree_cfg);
584                 if (access(get_git_work_tree(), X_OK))
585                         die_errno (_("Cannot access work tree '%s'"),
586                                    get_git_work_tree());
587         }
588         else {
589                 if (work_tree)
590                         set_git_work_tree(real_path(work_tree));
591         }
592
593         set_git_dir_init(git_dir, real_git_dir, 1);
594
595         return init_db(template_dir, flags);
596 }