diff --color-words: bit of clean-up
[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
24 static void safe_create_dir(const char *dir, int share)
25 {
26         if (mkdir(dir, 0777) < 0) {
27                 if (errno != EEXIST) {
28                         perror(dir);
29                         exit(1);
30                 }
31         }
32         else if (share && adjust_shared_perm(dir))
33                 die("Could not make %s writable by group", dir);
34 }
35
36 static void copy_templates_1(char *path, int baselen,
37                              char *template, int template_baselen,
38                              DIR *dir)
39 {
40         struct dirent *de;
41
42         /* Note: if ".git/hooks" file exists in the repository being
43          * re-initialized, /etc/core-git/templates/hooks/update would
44          * cause "git init" to fail here.  I think this is sane but
45          * it means that the set of templates we ship by default, along
46          * with the way the namespace under .git/ is organized, should
47          * be really carefully chosen.
48          */
49         safe_create_dir(path, 1);
50         while ((de = readdir(dir)) != NULL) {
51                 struct stat st_git, st_template;
52                 int namelen;
53                 int exists = 0;
54
55                 if (de->d_name[0] == '.')
56                         continue;
57                 namelen = strlen(de->d_name);
58                 if ((PATH_MAX <= baselen + namelen) ||
59                     (PATH_MAX <= template_baselen + namelen))
60                         die("insanely long template name %s", de->d_name);
61                 memcpy(path + baselen, de->d_name, namelen+1);
62                 memcpy(template + template_baselen, de->d_name, namelen+1);
63                 if (lstat(path, &st_git)) {
64                         if (errno != ENOENT)
65                                 die_errno("cannot stat '%s'", path);
66                 }
67                 else
68                         exists = 1;
69
70                 if (lstat(template, &st_template))
71                         die_errno("cannot stat template '%s'", template);
72
73                 if (S_ISDIR(st_template.st_mode)) {
74                         DIR *subdir = opendir(template);
75                         int baselen_sub = baselen + namelen;
76                         int template_baselen_sub = template_baselen + namelen;
77                         if (!subdir)
78                                 die_errno("cannot opendir '%s'", template);
79                         path[baselen_sub++] =
80                                 template[template_baselen_sub++] = '/';
81                         path[baselen_sub] =
82                                 template[template_baselen_sub] = 0;
83                         copy_templates_1(path, baselen_sub,
84                                          template, template_baselen_sub,
85                                          subdir);
86                         closedir(subdir);
87                 }
88                 else if (exists)
89                         continue;
90                 else if (S_ISLNK(st_template.st_mode)) {
91                         char lnk[256];
92                         int len;
93                         len = readlink(template, lnk, sizeof(lnk));
94                         if (len < 0)
95                                 die_errno("cannot readlink '%s'", template);
96                         if (sizeof(lnk) <= len)
97                                 die("insanely long symlink %s", template);
98                         lnk[len] = 0;
99                         if (symlink(lnk, path))
100                                 die_errno("cannot symlink '%s' '%s'", lnk, path);
101                 }
102                 else if (S_ISREG(st_template.st_mode)) {
103                         if (copy_file(path, template, st_template.st_mode))
104                                 die_errno("cannot copy '%s' to '%s'", template,
105                                           path);
106                 }
107                 else
108                         error("ignoring template %s", template);
109         }
110 }
111
112 static void copy_templates(const char *template_dir)
113 {
114         char path[PATH_MAX];
115         char template_path[PATH_MAX];
116         int template_len;
117         DIR *dir;
118         const char *git_dir = get_git_dir();
119         int len = strlen(git_dir);
120
121         if (!template_dir)
122                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
123         if (!template_dir)
124                 template_dir = system_path(DEFAULT_GIT_TEMPLATE_DIR);
125         if (!template_dir[0])
126                 return;
127         template_len = strlen(template_dir);
128         if (PATH_MAX <= (template_len+strlen("/config")))
129                 die("insanely long template path %s", template_dir);
130         strcpy(template_path, template_dir);
131         if (template_path[template_len-1] != '/') {
132                 template_path[template_len++] = '/';
133                 template_path[template_len] = 0;
134         }
135         dir = opendir(template_path);
136         if (!dir) {
137                 warning("templates not found %s", template_dir);
138                 return;
139         }
140
141         /* Make sure that template is from the correct vintage */
142         strcpy(template_path + template_len, "config");
143         repository_format_version = 0;
144         git_config_from_file(check_repository_format_version,
145                              template_path, NULL);
146         template_path[template_len] = 0;
147
148         if (repository_format_version &&
149             repository_format_version != GIT_REPO_VERSION) {
150                 warning("not copying templates of "
151                         "a wrong format version %d from '%s'",
152                         repository_format_version,
153                         template_dir);
154                 closedir(dir);
155                 return;
156         }
157
158         memcpy(path, git_dir, len);
159         if (len && path[len - 1] != '/')
160                 path[len++] = '/';
161         path[len] = 0;
162         copy_templates_1(path, len,
163                          template_path, template_len,
164                          dir);
165         closedir(dir);
166 }
167
168 static int create_default_files(const char *template_path)
169 {
170         const char *git_dir = get_git_dir();
171         unsigned len = strlen(git_dir);
172         static char path[PATH_MAX];
173         struct stat st1;
174         char repo_version_string[10];
175         char junk[2];
176         int reinit;
177         int filemode;
178
179         if (len > sizeof(path)-50)
180                 die("insane git directory %s", git_dir);
181         memcpy(path, git_dir, len);
182
183         if (len && path[len-1] != '/')
184                 path[len++] = '/';
185
186         /*
187          * Create .git/refs/{heads,tags}
188          */
189         safe_create_dir(git_path("refs"), 1);
190         safe_create_dir(git_path("refs/heads"), 1);
191         safe_create_dir(git_path("refs/tags"), 1);
192
193         /* First copy the templates -- we might have the default
194          * config file there, in which case we would want to read
195          * from it after installing.
196          */
197         copy_templates(template_path);
198
199         git_config(git_default_config, NULL);
200         is_bare_repository_cfg = init_is_bare_repository;
201
202         /* reading existing config may have overwrote it */
203         if (init_shared_repository != -1)
204                 shared_repository = init_shared_repository;
205
206         /*
207          * We would have created the above under user's umask -- under
208          * shared-repository settings, we would need to fix them up.
209          */
210         if (shared_repository) {
211                 adjust_shared_perm(get_git_dir());
212                 adjust_shared_perm(git_path("refs"));
213                 adjust_shared_perm(git_path("refs/heads"));
214                 adjust_shared_perm(git_path("refs/tags"));
215         }
216
217         /*
218          * Create the default symlink from ".git/HEAD" to the "master"
219          * branch, if it does not exist yet.
220          */
221         strcpy(path + len, "HEAD");
222         reinit = (!access(path, R_OK)
223                   || readlink(path, junk, sizeof(junk)-1) != -1);
224         if (!reinit) {
225                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
226                         exit(1);
227         }
228
229         /* This forces creation of new config file */
230         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
231         git_config_set("core.repositoryformatversion", repo_version_string);
232
233         path[len] = 0;
234         strcpy(path + len, "config");
235
236         /* Check filemode trustability */
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         }
244         git_config_set("core.filemode", filemode ? "true" : "false");
245
246         if (is_bare_repository())
247                 git_config_set("core.bare", "true");
248         else {
249                 const char *work_tree = get_git_work_tree();
250                 git_config_set("core.bare", "false");
251                 /* allow template config file to override the default */
252                 if (log_all_ref_updates == -1)
253                     git_config_set("core.logallrefupdates", "true");
254                 if (prefixcmp(git_dir, work_tree) ||
255                     strcmp(git_dir + strlen(work_tree), "/.git")) {
256                         git_config_set("core.worktree", work_tree);
257                 }
258         }
259
260         if (!reinit) {
261                 /* Check if symlink is supported in the work tree */
262                 path[len] = 0;
263                 strcpy(path + len, "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[len] = 0;
275                 strcpy(path + len, "CoNfIg");
276                 if (!access(path, F_OK))
277                         git_config_set("core.ignorecase", "true");
278         }
279
280         return reinit;
281 }
282
283 int init_db(const char *template_dir, unsigned int flags)
284 {
285         const char *sha1_dir;
286         char *path;
287         int len, reinit;
288
289         safe_create_dir(get_git_dir(), 0);
290
291         init_is_bare_repository = is_bare_repository();
292
293         /* Check to see if the repository version is right.
294          * Note that a newly created repository does not have
295          * config file, so this will not fail.  What we are catching
296          * is an attempt to reinitialize new repository with an old tool.
297          */
298         check_repository_format();
299
300         reinit = create_default_files(template_dir);
301
302         sha1_dir = get_object_directory();
303         len = strlen(sha1_dir);
304         path = xmalloc(len + 40);
305         memcpy(path, sha1_dir, len);
306
307         safe_create_dir(sha1_dir, 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         if (shared_repository) {
314                 char buf[10];
315                 /* We do not spell "group" and such, so that
316                  * the configuration can be read by older version
317                  * of git. Note, we use octal numbers for new share modes,
318                  * and compatibility values for PERM_GROUP and
319                  * PERM_EVERYBODY.
320                  */
321                 if (shared_repository < 0)
322                         /* force to the mode value */
323                         sprintf(buf, "0%o", -shared_repository);
324                 else if (shared_repository == PERM_GROUP)
325                         sprintf(buf, "%d", OLD_PERM_GROUP);
326                 else if (shared_repository == PERM_EVERYBODY)
327                         sprintf(buf, "%d", OLD_PERM_EVERYBODY);
328                 else
329                         die("oops");
330                 git_config_set("core.sharedrepository", buf);
331                 git_config_set("receive.denyNonFastforwards", "true");
332         }
333
334         if (!(flags & INIT_DB_QUIET))
335                 printf("%s%s Git repository in %s/\n",
336                        reinit ? "Reinitialized existing" : "Initialized empty",
337                        shared_repository ? " shared" : "",
338                        get_git_dir());
339
340         return 0;
341 }
342
343 static int guess_repository_type(const char *git_dir)
344 {
345         char cwd[PATH_MAX];
346         const char *slash;
347
348         /*
349          * "GIT_DIR=. git init" is always bare.
350          * "GIT_DIR=`pwd` git init" too.
351          */
352         if (!strcmp(".", git_dir))
353                 return 1;
354         if (!getcwd(cwd, sizeof(cwd)))
355                 die_errno("cannot tell cwd");
356         if (!strcmp(git_dir, cwd))
357                 return 1;
358         /*
359          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
360          */
361         if (!strcmp(git_dir, ".git"))
362                 return 0;
363         slash = strrchr(git_dir, '/');
364         if (slash && !strcmp(slash, "/.git"))
365                 return 0;
366
367         /*
368          * Otherwise it is often bare.  At this point
369          * we are just guessing.
370          */
371         return 1;
372 }
373
374 static int shared_callback(const struct option *opt, const char *arg, int unset)
375 {
376         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
377         return 0;
378 }
379
380 static const char *const init_db_usage[] = {
381         "git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]",
382         NULL
383 };
384
385 /*
386  * If you want to, you can share the DB area with any number of branches.
387  * That has advantages: you can save space by sharing all the SHA1 objects.
388  * On the other hand, it might just make lookup slower and messier. You
389  * be the judge.  The default case is to have one DB per managed directory.
390  */
391 int cmd_init_db(int argc, const char **argv, const char *prefix)
392 {
393         const char *git_dir;
394         const char *template_dir = NULL;
395         unsigned int flags = 0;
396         const struct option init_db_options[] = {
397                 OPT_STRING(0, "template", &template_dir, "template-directory",
398                                 "provide the directory from which templates will be used"),
399                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
400                                 "create a bare repository", 1),
401                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
402                         "permissions",
403                         "specify that the git repository is to be shared amongst several users",
404                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
405                 OPT_BIT('q', "quiet", &flags, "be quiet", INIT_DB_QUIET),
406                 OPT_END()
407         };
408
409         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
410
411         if (argc == 1) {
412                 int mkdir_tried = 0;
413         retry:
414                 if (chdir(argv[0]) < 0) {
415                         if (!mkdir_tried) {
416                                 int saved;
417                                 /*
418                                  * At this point we haven't read any configuration,
419                                  * and we know shared_repository should always be 0;
420                                  * but just in case we play safe.
421                                  */
422                                 saved = shared_repository;
423                                 shared_repository = 0;
424                                 switch (safe_create_leading_directories_const(argv[0])) {
425                                 case -3:
426                                         errno = EEXIST;
427                                         /* fallthru */
428                                 case -1:
429                                         die_errno("cannot mkdir %s", argv[0]);
430                                         break;
431                                 default:
432                                         break;
433                                 }
434                                 shared_repository = saved;
435                                 if (mkdir(argv[0], 0777) < 0)
436                                         die_errno("cannot mkdir %s", argv[0]);
437                                 mkdir_tried = 1;
438                                 goto retry;
439                         }
440                         die_errno("cannot chdir to %s", argv[0]);
441                 }
442         } else if (0 < argc) {
443                 usage(init_db_usage[0]);
444         }
445         if (is_bare_repository_cfg == 1) {
446                 static char git_dir[PATH_MAX+1];
447
448                 setenv(GIT_DIR_ENVIRONMENT,
449                         getcwd(git_dir, sizeof(git_dir)), 0);
450         }
451
452         if (init_shared_repository != -1)
453                 shared_repository = init_shared_repository;
454
455         /*
456          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
457          * without --bare.  Catch the error early.
458          */
459         git_dir = getenv(GIT_DIR_ENVIRONMENT);
460         if ((!git_dir || is_bare_repository_cfg == 1)
461             && getenv(GIT_WORK_TREE_ENVIRONMENT))
462                 die("%s (or --work-tree=<directory>) not allowed without "
463                     "specifying %s (or --git-dir=<directory>)",
464                     GIT_WORK_TREE_ENVIRONMENT,
465                     GIT_DIR_ENVIRONMENT);
466
467         /*
468          * Set up the default .git directory contents
469          */
470         if (!git_dir)
471                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
472
473         if (is_bare_repository_cfg < 0)
474                 is_bare_repository_cfg = guess_repository_type(git_dir);
475
476         if (!is_bare_repository_cfg) {
477                 if (git_dir) {
478                         const char *git_dir_parent = strrchr(git_dir, '/');
479                         if (git_dir_parent) {
480                                 char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
481                                 git_work_tree_cfg = xstrdup(make_absolute_path(rel));
482                                 free(rel);
483                         }
484                 }
485                 if (!git_work_tree_cfg) {
486                         git_work_tree_cfg = xcalloc(PATH_MAX, 1);
487                         if (!getcwd(git_work_tree_cfg, PATH_MAX))
488                                 die_errno ("Cannot access current working directory");
489                 }
490                 if (access(get_git_work_tree(), X_OK))
491                         die_errno ("Cannot access work tree '%s'",
492                                    get_git_work_tree());
493         }
494
495         set_git_dir(make_absolute_path(git_dir));
496
497         return init_db(template_dir, flags);
498 }