Code

edc40ff5748fbd68b64f382c251c6b030cf88803
[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"
11 #ifndef DEFAULT_GIT_TEMPLATE_DIR
12 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
13 #endif
15 #ifdef NO_TRUSTABLE_FILEMODE
16 #define TEST_FILEMODE 0
17 #else
18 #define TEST_FILEMODE 1
19 #endif
21 static int init_is_bare_repository = 0;
22 static int init_shared_repository = -1;
23 static const char *init_db_template_dir;
25 static void safe_create_dir(const char *dir, int share)
26 {
27         if (mkdir(dir, 0777) < 0) {
28                 if (errno != EEXIST) {
29                         perror(dir);
30                         exit(1);
31                 }
32         }
33         else if (share && adjust_shared_perm(dir))
34                 die("Could not make %s writable by group", dir);
35 }
37 static void copy_templates_1(char *path, int baselen,
38                              char *template, int template_baselen,
39                              DIR *dir)
40 {
41         struct dirent *de;
43         /* Note: if ".git/hooks" file exists in the repository being
44          * re-initialized, /etc/core-git/templates/hooks/update would
45          * cause "git init" to fail here.  I think this is sane but
46          * it means that the set of templates we ship by default, along
47          * with the way the namespace under .git/ is organized, should
48          * be really carefully chosen.
49          */
50         safe_create_dir(path, 1);
51         while ((de = readdir(dir)) != NULL) {
52                 struct stat st_git, st_template;
53                 int namelen;
54                 int exists = 0;
56                 if (de->d_name[0] == '.')
57                         continue;
58                 namelen = strlen(de->d_name);
59                 if ((PATH_MAX <= baselen + namelen) ||
60                     (PATH_MAX <= template_baselen + namelen))
61                         die("insanely long template name %s", de->d_name);
62                 memcpy(path + baselen, de->d_name, namelen+1);
63                 memcpy(template + template_baselen, de->d_name, namelen+1);
64                 if (lstat(path, &st_git)) {
65                         if (errno != ENOENT)
66                                 die_errno("cannot stat '%s'", path);
67                 }
68                 else
69                         exists = 1;
71                 if (lstat(template, &st_template))
72                         die_errno("cannot stat template '%s'", template);
74                 if (S_ISDIR(st_template.st_mode)) {
75                         DIR *subdir = opendir(template);
76                         int baselen_sub = baselen + namelen;
77                         int template_baselen_sub = template_baselen + namelen;
78                         if (!subdir)
79                                 die_errno("cannot opendir '%s'", template);
80                         path[baselen_sub++] =
81                                 template[template_baselen_sub++] = '/';
82                         path[baselen_sub] =
83                                 template[template_baselen_sub] = 0;
84                         copy_templates_1(path, baselen_sub,
85                                          template, template_baselen_sub,
86                                          subdir);
87                         closedir(subdir);
88                 }
89                 else if (exists)
90                         continue;
91                 else if (S_ISLNK(st_template.st_mode)) {
92                         char lnk[256];
93                         int len;
94                         len = readlink(template, lnk, sizeof(lnk));
95                         if (len < 0)
96                                 die_errno("cannot readlink '%s'", template);
97                         if (sizeof(lnk) <= len)
98                                 die("insanely long symlink %s", template);
99                         lnk[len] = 0;
100                         if (symlink(lnk, path))
101                                 die_errno("cannot symlink '%s' '%s'", lnk, path);
102                 }
103                 else if (S_ISREG(st_template.st_mode)) {
104                         if (copy_file(path, template, st_template.st_mode))
105                                 die_errno("cannot copy '%s' to '%s'", template,
106                                           path);
107                 }
108                 else
109                         error("ignoring template %s", template);
110         }
113 static void copy_templates(const char *template_dir)
115         char path[PATH_MAX];
116         char template_path[PATH_MAX];
117         int template_len;
118         DIR *dir;
119         const char *git_dir = get_git_dir();
120         int len = strlen(git_dir);
122         if (!template_dir)
123                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
124         if (!template_dir)
125                 template_dir = init_db_template_dir;
126         if (!template_dir)
127                 template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
128         if (!template_dir[0])
129                 return;
130         template_len = strlen(template_dir);
131         if (PATH_MAX <= (template_len+strlen("/config")))
132                 die("insanely long template path %s", template_dir);
133         strcpy(template_path, template_dir);
134         if (template_path[template_len-1] != '/') {
135                 template_path[template_len++] = '/';
136                 template_path[template_len] = 0;
137         }
138         dir = opendir(template_path);
139         if (!dir) {
140                 warning("templates not found %s", template_dir);
141                 return;
142         }
144         /* Make sure that template is from the correct vintage */
145         strcpy(template_path + template_len, "config");
146         repository_format_version = 0;
147         git_config_from_file(check_repository_format_version,
148                              template_path, NULL);
149         template_path[template_len] = 0;
151         if (repository_format_version &&
152             repository_format_version != GIT_REPO_VERSION) {
153                 warning("not copying templates of "
154                         "a wrong format version %d from '%s'",
155                         repository_format_version,
156                         template_dir);
157                 closedir(dir);
158                 return;
159         }
161         memcpy(path, git_dir, len);
162         if (len && path[len - 1] != '/')
163                 path[len++] = '/';
164         path[len] = 0;
165         copy_templates_1(path, len,
166                          template_path, template_len,
167                          dir);
168         closedir(dir);
171 static int git_init_db_config(const char *k, const char *v, void *cb)
173         if (!strcmp(k, "init.templatedir"))
174                 return git_config_pathname(&init_db_template_dir, k, v);
176         return 0;
179 static int create_default_files(const char *template_path)
181         const char *git_dir = get_git_dir();
182         unsigned len = strlen(git_dir);
183         static char path[PATH_MAX];
184         struct stat st1;
185         char repo_version_string[10];
186         char junk[2];
187         int reinit;
188         int filemode;
190         if (len > sizeof(path)-50)
191                 die("insane git directory %s", git_dir);
192         memcpy(path, git_dir, len);
194         if (len && path[len-1] != '/')
195                 path[len++] = '/';
197         /*
198          * Create .git/refs/{heads,tags}
199          */
200         safe_create_dir(git_path("refs"), 1);
201         safe_create_dir(git_path("refs/heads"), 1);
202         safe_create_dir(git_path("refs/tags"), 1);
204         /* Just look for `init.templatedir` */
205         git_config(git_init_db_config, NULL);
207         /* First copy the templates -- we might have the default
208          * config file there, in which case we would want to read
209          * from it after installing.
210          */
211         copy_templates(template_path);
213         git_config(git_default_config, NULL);
214         is_bare_repository_cfg = init_is_bare_repository;
216         /* reading existing config may have overwrote it */
217         if (init_shared_repository != -1)
218                 shared_repository = init_shared_repository;
220         /*
221          * We would have created the above under user's umask -- under
222          * shared-repository settings, we would need to fix them up.
223          */
224         if (shared_repository) {
225                 adjust_shared_perm(get_git_dir());
226                 adjust_shared_perm(git_path("refs"));
227                 adjust_shared_perm(git_path("refs/heads"));
228                 adjust_shared_perm(git_path("refs/tags"));
229         }
231         /*
232          * Create the default symlink from ".git/HEAD" to the "master"
233          * branch, if it does not exist yet.
234          */
235         strcpy(path + len, "HEAD");
236         reinit = (!access(path, R_OK)
237                   || readlink(path, junk, sizeof(junk)-1) != -1);
238         if (!reinit) {
239                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
240                         exit(1);
241         }
243         /* This forces creation of new config file */
244         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
245         git_config_set("core.repositoryformatversion", repo_version_string);
247         path[len] = 0;
248         strcpy(path + len, "config");
250         /* Check filemode trustability */
251         filemode = TEST_FILEMODE;
252         if (TEST_FILEMODE && !lstat(path, &st1)) {
253                 struct stat st2;
254                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
255                                 !lstat(path, &st2) &&
256                                 st1.st_mode != st2.st_mode);
257         }
258         git_config_set("core.filemode", filemode ? "true" : "false");
260         if (is_bare_repository())
261                 git_config_set("core.bare", "true");
262         else {
263                 const char *work_tree = get_git_work_tree();
264                 git_config_set("core.bare", "false");
265                 /* allow template config file to override the default */
266                 if (log_all_ref_updates == -1)
267                     git_config_set("core.logallrefupdates", "true");
268                 if (prefixcmp(git_dir, work_tree) ||
269                     strcmp(git_dir + strlen(work_tree), "/.git")) {
270                         git_config_set("core.worktree", work_tree);
271                 }
272         }
274         if (!reinit) {
275                 /* Check if symlink is supported in the work tree */
276                 path[len] = 0;
277                 strcpy(path + len, "tXXXXXX");
278                 if (!close(xmkstemp(path)) &&
279                     !unlink(path) &&
280                     !symlink("testing", path) &&
281                     !lstat(path, &st1) &&
282                     S_ISLNK(st1.st_mode))
283                         unlink(path); /* good */
284                 else
285                         git_config_set("core.symlinks", "false");
287                 /* Check if the filesystem is case-insensitive */
288                 path[len] = 0;
289                 strcpy(path + len, "CoNfIg");
290                 if (!access(path, F_OK))
291                         git_config_set("core.ignorecase", "true");
292         }
294         return reinit;
297 int init_db(const char *template_dir, unsigned int flags)
299         const char *sha1_dir;
300         char *path;
301         int len, reinit;
303         safe_create_dir(get_git_dir(), 0);
305         init_is_bare_repository = is_bare_repository();
307         /* Check to see if the repository version is right.
308          * Note that a newly created repository does not have
309          * config file, so this will not fail.  What we are catching
310          * is an attempt to reinitialize new repository with an old tool.
311          */
312         check_repository_format();
314         reinit = create_default_files(template_dir);
316         sha1_dir = get_object_directory();
317         len = strlen(sha1_dir);
318         path = xmalloc(len + 40);
319         memcpy(path, sha1_dir, len);
321         safe_create_dir(sha1_dir, 1);
322         strcpy(path+len, "/pack");
323         safe_create_dir(path, 1);
324         strcpy(path+len, "/info");
325         safe_create_dir(path, 1);
327         if (shared_repository) {
328                 char buf[10];
329                 /* We do not spell "group" and such, so that
330                  * the configuration can be read by older version
331                  * of git. Note, we use octal numbers for new share modes,
332                  * and compatibility values for PERM_GROUP and
333                  * PERM_EVERYBODY.
334                  */
335                 if (shared_repository < 0)
336                         /* force to the mode value */
337                         sprintf(buf, "0%o", -shared_repository);
338                 else if (shared_repository == PERM_GROUP)
339                         sprintf(buf, "%d", OLD_PERM_GROUP);
340                 else if (shared_repository == PERM_EVERYBODY)
341                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
342                 else
343                         die("oops");
344                 git_config_set("core.sharedrepository", buf);
345                 git_config_set("receive.denyNonFastforwards", "true");
346         }
348         if (!(flags & INIT_DB_QUIET)) {
349                 const char *git_dir = get_git_dir();
350                 int len = strlen(git_dir);
351                 printf("%s%s Git repository in %s%s\n",
352                        reinit ? "Reinitialized existing" : "Initialized empty",
353                        shared_repository ? " shared" : "",
354                        git_dir, len && git_dir[len-1] != '/' ? "/" : "");
355         }
357         return 0;
360 static int guess_repository_type(const char *git_dir)
362         char cwd[PATH_MAX];
363         const char *slash;
365         /*
366          * "GIT_DIR=. git init" is always bare.
367          * "GIT_DIR=`pwd` git init" too.
368          */
369         if (!strcmp(".", git_dir))
370                 return 1;
371         if (!getcwd(cwd, sizeof(cwd)))
372                 die_errno("cannot tell cwd");
373         if (!strcmp(git_dir, cwd))
374                 return 1;
375         /*
376          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
377          */
378         if (!strcmp(git_dir, ".git"))
379                 return 0;
380         slash = strrchr(git_dir, '/');
381         if (slash && !strcmp(slash, "/.git"))
382                 return 0;
384         /*
385          * Otherwise it is often bare.  At this point
386          * we are just guessing.
387          */
388         return 1;
391 static int shared_callback(const struct option *opt, const char *arg, int unset)
393         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
394         return 0;
397 static const char *const init_db_usage[] = {
398         "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]",
399         NULL
400 };
402 /*
403  * If you want to, you can share the DB area with any number of branches.
404  * That has advantages: you can save space by sharing all the SHA1 objects.
405  * On the other hand, it might just make lookup slower and messier. You
406  * be the judge.  The default case is to have one DB per managed directory.
407  */
408 int cmd_init_db(int argc, const char **argv, const char *prefix)
410         const char *git_dir;
411         const char *template_dir = NULL;
412         unsigned int flags = 0;
413         const struct option init_db_options[] = {
414                 OPT_STRING(0, "template", &template_dir, "template-directory",
415                                 "provide the directory from which templates will be used"),
416                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
417                                 "create a bare repository", 1),
418                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
419                         "permissions",
420                         "specify that the git repository is to be shared amongst several users",
421                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
422                 OPT_BIT('q', "quiet", &flags, "be quiet", INIT_DB_QUIET),
423                 OPT_END()
424         };
426         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
428         if (argc == 1) {
429                 int mkdir_tried = 0;
430         retry:
431                 if (chdir(argv[0]) < 0) {
432                         if (!mkdir_tried) {
433                                 int saved;
434                                 /*
435                                  * At this point we haven't read any configuration,
436                                  * and we know shared_repository should always be 0;
437                                  * but just in case we play safe.
438                                  */
439                                 saved = shared_repository;
440                                 shared_repository = 0;
441                                 switch (safe_create_leading_directories_const(argv[0])) {
442                                 case -3:
443                                         errno = EEXIST;
444                                         /* fallthru */
445                                 case -1:
446                                         die_errno("cannot mkdir %s", argv[0]);
447                                         break;
448                                 default:
449                                         break;
450                                 }
451                                 shared_repository = saved;
452                                 if (mkdir(argv[0], 0777) < 0)
453                                         die_errno("cannot mkdir %s", argv[0]);
454                                 mkdir_tried = 1;
455                                 goto retry;
456                         }
457                         die_errno("cannot chdir to %s", argv[0]);
458                 }
459         } else if (0 < argc) {
460                 usage(init_db_usage[0]);
461         }
462         if (is_bare_repository_cfg == 1) {
463                 static char git_dir[PATH_MAX+1];
465                 setenv(GIT_DIR_ENVIRONMENT,
466                         getcwd(git_dir, sizeof(git_dir)), 0);
467         }
469         if (init_shared_repository != -1)
470                 shared_repository = init_shared_repository;
472         /*
473          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
474          * without --bare.  Catch the error early.
475          */
476         git_dir = getenv(GIT_DIR_ENVIRONMENT);
477         if ((!git_dir || is_bare_repository_cfg == 1)
478             && getenv(GIT_WORK_TREE_ENVIRONMENT))
479                 die("%s (or --work-tree=<directory>) not allowed without "
480                     "specifying %s (or --git-dir=<directory>)",
481                     GIT_WORK_TREE_ENVIRONMENT,
482                     GIT_DIR_ENVIRONMENT);
484         /*
485          * Set up the default .git directory contents
486          */
487         if (!git_dir)
488                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
490         if (is_bare_repository_cfg < 0)
491                 is_bare_repository_cfg = guess_repository_type(git_dir);
493         if (!is_bare_repository_cfg) {
494                 if (git_dir) {
495                         const char *git_dir_parent = strrchr(git_dir, '/');
496                         if (git_dir_parent) {
497                                 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
498                                 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
499                                 free(rel);
500                         }
501                 }
502                 if (!git_work_tree_cfg) {
503                         git_work_tree_cfg = xcalloc(PATH_MAX, 1);
504                         if (!getcwd(git_work_tree_cfg, PATH_MAX))
505                                 die_errno ("Cannot access current working directory");
506                 }
507                 if (access(get_git_work_tree(), X_OK))
508                         die_errno ("Cannot access work tree '%s'",
509                                    get_git_work_tree());
510         }
512         set_git_dir(make_absolute_path(git_dir));
514         return init_db(template_dir, flags);