Sync with maint
[git.git] / setup.c
blob0a22f8bd1d631fe5f0afe1d84162ca4064a00e4f
1 #include "cache.h"
2 #include "dir.h"
3 #include "string-list.h"
5 static int inside_git_dir = -1;
6 static int inside_work_tree = -1;
8 /*
9 * The input parameter must contain an absolute path, and it must already be
10 * normalized.
12 * Find the part of an absolute path that lies inside the work tree by
13 * dereferencing symlinks outside the work tree, for example:
14 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
15 * /dir/file (work tree is /) -> dir/file
16 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
17 * /dir/repolink/file (repolink points to /dir/repo) -> file
18 * /dir/repo (exactly equal to work tree) -> (empty string)
20 static int abspath_part_inside_repo(char *path)
22 size_t len;
23 size_t wtlen;
24 char *path0;
25 int off;
26 const char *work_tree = get_git_work_tree();
28 if (!work_tree)
29 return -1;
30 wtlen = strlen(work_tree);
31 len = strlen(path);
32 off = offset_1st_component(path);
34 /* check if work tree is already the prefix */
35 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
36 if (path[wtlen] == '/') {
37 memmove(path, path + wtlen + 1, len - wtlen);
38 return 0;
39 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
40 /* work tree is the root, or the whole path */
41 memmove(path, path + wtlen, len - wtlen + 1);
42 return 0;
44 /* work tree might match beginning of a symlink to work tree */
45 off = wtlen;
47 path0 = path;
48 path += off;
50 /* check each '/'-terminated level */
51 while (*path) {
52 path++;
53 if (*path == '/') {
54 *path = '\0';
55 if (strcmp(real_path(path0), work_tree) == 0) {
56 memmove(path0, path + 1, len - (path - path0));
57 return 0;
59 *path = '/';
63 /* check whole path */
64 if (strcmp(real_path(path0), work_tree) == 0) {
65 *path0 = '\0';
66 return 0;
69 return -1;
73 * Normalize "path", prepending the "prefix" for relative paths. If
74 * remaining_prefix is not NULL, return the actual prefix still
75 * remains in the path. For example, prefix = sub1/sub2/ and path is
77 * foo -> sub1/sub2/foo (full prefix)
78 * ../foo -> sub1/foo (remaining prefix is sub1/)
79 * ../../bar -> bar (no remaining prefix)
80 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
81 * `pwd`/../bar -> sub1/bar (no remaining prefix)
83 char *prefix_path_gently(const char *prefix, int len,
84 int *remaining_prefix, const char *path)
86 const char *orig = path;
87 char *sanitized;
88 if (is_absolute_path(orig)) {
89 sanitized = xmalloc(strlen(path) + 1);
90 if (remaining_prefix)
91 *remaining_prefix = 0;
92 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
93 free(sanitized);
94 return NULL;
96 if (abspath_part_inside_repo(sanitized)) {
97 free(sanitized);
98 return NULL;
100 } else {
101 sanitized = xmalloc(len + strlen(path) + 1);
102 if (len)
103 memcpy(sanitized, prefix, len);
104 strcpy(sanitized + len, path);
105 if (remaining_prefix)
106 *remaining_prefix = len;
107 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
108 free(sanitized);
109 return NULL;
112 return sanitized;
115 char *prefix_path(const char *prefix, int len, const char *path)
117 char *r = prefix_path_gently(prefix, len, NULL, path);
118 if (!r)
119 die("'%s' is outside repository", path);
120 return r;
123 int path_inside_repo(const char *prefix, const char *path)
125 int len = prefix ? strlen(prefix) : 0;
126 char *r = prefix_path_gently(prefix, len, NULL, path);
127 if (r) {
128 free(r);
129 return 1;
131 return 0;
134 int check_filename(const char *prefix, const char *arg)
136 const char *name;
137 struct stat st;
139 if (starts_with(arg, ":/")) {
140 if (arg[2] == '\0') /* ":/" is root dir, always exists */
141 return 1;
142 name = arg + 2;
143 } else if (prefix)
144 name = prefix_filename(prefix, strlen(prefix), arg);
145 else
146 name = arg;
147 if (!lstat(name, &st))
148 return 1; /* file exists */
149 if (errno == ENOENT || errno == ENOTDIR)
150 return 0; /* file does not exist */
151 die_errno("failed to stat '%s'", arg);
154 static void NORETURN die_verify_filename(const char *prefix,
155 const char *arg,
156 int diagnose_misspelt_rev)
158 if (!diagnose_misspelt_rev)
159 die("%s: no such path in the working tree.\n"
160 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
161 arg);
163 * Saying "'(icase)foo' does not exist in the index" when the
164 * user gave us ":(icase)foo" is just stupid. A magic pathspec
165 * begins with a colon and is followed by a non-alnum; do not
166 * let maybe_die_on_misspelt_object_name() even trigger.
168 if (!(arg[0] == ':' && !isalnum(arg[1])))
169 maybe_die_on_misspelt_object_name(arg, prefix);
171 /* ... or fall back the most general message. */
172 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
173 "Use '--' to separate paths from revisions, like this:\n"
174 "'git <command> [<revision>...] -- [<file>...]'", arg);
179 * Verify a filename that we got as an argument for a pathspec
180 * entry. Note that a filename that begins with "-" never verifies
181 * as true, because even if such a filename were to exist, we want
182 * it to be preceded by the "--" marker (or we want the user to
183 * use a format like "./-filename")
185 * The "diagnose_misspelt_rev" is used to provide a user-friendly
186 * diagnosis when dying upon finding that "name" is not a pathname.
187 * If set to 1, the diagnosis will try to diagnose "name" as an
188 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
189 * will only complain about an inexisting file.
191 * This function is typically called to check that a "file or rev"
192 * argument is unambiguous. In this case, the caller will want
193 * diagnose_misspelt_rev == 1 when verifying the first non-rev
194 * argument (which could have been a revision), and
195 * diagnose_misspelt_rev == 0 for the next ones (because we already
196 * saw a filename, there's not ambiguity anymore).
198 void verify_filename(const char *prefix,
199 const char *arg,
200 int diagnose_misspelt_rev)
202 if (*arg == '-')
203 die("bad flag '%s' used after filename", arg);
204 if (check_filename(prefix, arg))
205 return;
206 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
210 * Opposite of the above: the command line did not have -- marker
211 * and we parsed the arg as a refname. It should not be interpretable
212 * as a filename.
214 void verify_non_filename(const char *prefix, const char *arg)
216 if (!is_inside_work_tree() || is_inside_git_dir())
217 return;
218 if (*arg == '-')
219 return; /* flag */
220 if (!check_filename(prefix, arg))
221 return;
222 die("ambiguous argument '%s': both revision and filename\n"
223 "Use '--' to separate paths from revisions, like this:\n"
224 "'git <command> [<revision>...] -- [<file>...]'", arg);
229 * Test if it looks like we're at a git directory.
230 * We want to see:
232 * - either an objects/ directory _or_ the proper
233 * GIT_OBJECT_DIRECTORY environment variable
234 * - a refs/ directory
235 * - either a HEAD symlink or a HEAD file that is formatted as
236 * a proper "ref:", or a regular file HEAD that has a properly
237 * formatted sha1 object name.
239 int is_git_directory(const char *suspect)
241 char path[PATH_MAX];
242 size_t len = strlen(suspect);
244 if (PATH_MAX <= len + strlen("/objects"))
245 die("Too long path: %.*s", 60, suspect);
246 strcpy(path, suspect);
247 if (getenv(DB_ENVIRONMENT)) {
248 if (access(getenv(DB_ENVIRONMENT), X_OK))
249 return 0;
251 else {
252 strcpy(path + len, "/objects");
253 if (access(path, X_OK))
254 return 0;
257 strcpy(path + len, "/refs");
258 if (access(path, X_OK))
259 return 0;
261 strcpy(path + len, "/HEAD");
262 if (validate_headref(path))
263 return 0;
265 return 1;
268 int is_inside_git_dir(void)
270 if (inside_git_dir < 0)
271 inside_git_dir = is_inside_dir(get_git_dir());
272 return inside_git_dir;
275 int is_inside_work_tree(void)
277 if (inside_work_tree < 0)
278 inside_work_tree = is_inside_dir(get_git_work_tree());
279 return inside_work_tree;
282 void setup_work_tree(void)
284 const char *work_tree, *git_dir;
285 static int initialized = 0;
287 if (initialized)
288 return;
289 work_tree = get_git_work_tree();
290 git_dir = get_git_dir();
291 if (!is_absolute_path(git_dir))
292 git_dir = real_path(get_git_dir());
293 if (!work_tree || chdir(work_tree))
294 die("This operation must be run in a work tree");
297 * Make sure subsequent git processes find correct worktree
298 * if $GIT_WORK_TREE is set relative
300 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
301 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
303 set_git_dir(remove_leading_path(git_dir, work_tree));
304 initialized = 1;
307 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
309 char repo_config[PATH_MAX+1];
312 * git_config() can't be used here because it calls git_pathdup()
313 * to get $GIT_CONFIG/config. That call will make setup_git_env()
314 * set git_dir to ".git".
316 * We are in gitdir setup, no git dir has been found useable yet.
317 * Use a gentler version of git_config() to check if this repo
318 * is a good one.
320 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
321 git_config_early(check_repository_format_version, NULL, repo_config);
322 if (GIT_REPO_VERSION < repository_format_version) {
323 if (!nongit_ok)
324 die ("Expected git repo version <= %d, found %d",
325 GIT_REPO_VERSION, repository_format_version);
326 warning("Expected git repo version <= %d, found %d",
327 GIT_REPO_VERSION, repository_format_version);
328 warning("Please upgrade Git");
329 *nongit_ok = -1;
330 return -1;
332 return 0;
336 * Try to read the location of the git directory from the .git file,
337 * return path to git directory if found.
339 const char *read_gitfile(const char *path)
341 char *buf;
342 char *dir;
343 const char *slash;
344 struct stat st;
345 int fd;
346 ssize_t len;
348 if (stat(path, &st))
349 return NULL;
350 if (!S_ISREG(st.st_mode))
351 return NULL;
352 fd = open(path, O_RDONLY);
353 if (fd < 0)
354 die_errno("Error opening '%s'", path);
355 buf = xmalloc(st.st_size + 1);
356 len = read_in_full(fd, buf, st.st_size);
357 close(fd);
358 if (len != st.st_size)
359 die("Error reading %s", path);
360 buf[len] = '\0';
361 if (!starts_with(buf, "gitdir: "))
362 die("Invalid gitfile format: %s", path);
363 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
364 len--;
365 if (len < 9)
366 die("No path in gitfile: %s", path);
367 buf[len] = '\0';
368 dir = buf + 8;
370 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
371 size_t pathlen = slash+1 - path;
372 size_t dirlen = pathlen + len - 8;
373 dir = xmalloc(dirlen + 1);
374 strncpy(dir, path, pathlen);
375 strncpy(dir + pathlen, buf + 8, len - 8);
376 dir[dirlen] = '\0';
377 free(buf);
378 buf = dir;
381 if (!is_git_directory(dir))
382 die("Not a git repository: %s", dir);
383 path = real_path(dir);
385 free(buf);
386 return path;
389 static const char *setup_explicit_git_dir(const char *gitdirenv,
390 char *cwd, int len,
391 int *nongit_ok)
393 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
394 const char *worktree;
395 char *gitfile;
396 int offset;
398 if (PATH_MAX - 40 < strlen(gitdirenv))
399 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
401 gitfile = (char*)read_gitfile(gitdirenv);
402 if (gitfile) {
403 gitfile = xstrdup(gitfile);
404 gitdirenv = gitfile;
407 if (!is_git_directory(gitdirenv)) {
408 if (nongit_ok) {
409 *nongit_ok = 1;
410 free(gitfile);
411 return NULL;
413 die("Not a git repository: '%s'", gitdirenv);
416 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
417 free(gitfile);
418 return NULL;
421 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
422 if (work_tree_env)
423 set_git_work_tree(work_tree_env);
424 else if (is_bare_repository_cfg > 0) {
425 if (git_work_tree_cfg) /* #22.2, #30 */
426 die("core.bare and core.worktree do not make sense");
428 /* #18, #26 */
429 set_git_dir(gitdirenv);
430 free(gitfile);
431 return NULL;
433 else if (git_work_tree_cfg) { /* #6, #14 */
434 if (is_absolute_path(git_work_tree_cfg))
435 set_git_work_tree(git_work_tree_cfg);
436 else {
437 char core_worktree[PATH_MAX];
438 if (chdir(gitdirenv))
439 die_errno("Could not chdir to '%s'", gitdirenv);
440 if (chdir(git_work_tree_cfg))
441 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
442 if (!getcwd(core_worktree, PATH_MAX))
443 die_errno("Could not get directory '%s'", git_work_tree_cfg);
444 if (chdir(cwd))
445 die_errno("Could not come back to cwd");
446 set_git_work_tree(core_worktree);
449 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
450 /* #16d */
451 set_git_dir(gitdirenv);
452 free(gitfile);
453 return NULL;
455 else /* #2, #10 */
456 set_git_work_tree(".");
458 /* set_git_work_tree() must have been called by now */
459 worktree = get_git_work_tree();
461 /* both get_git_work_tree() and cwd are already normalized */
462 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
463 set_git_dir(gitdirenv);
464 free(gitfile);
465 return NULL;
468 offset = dir_inside_of(cwd, worktree);
469 if (offset >= 0) { /* cwd inside worktree? */
470 set_git_dir(real_path(gitdirenv));
471 if (chdir(worktree))
472 die_errno("Could not chdir to '%s'", worktree);
473 cwd[len++] = '/';
474 cwd[len] = '\0';
475 free(gitfile);
476 return cwd + offset;
479 /* cwd outside worktree */
480 set_git_dir(gitdirenv);
481 free(gitfile);
482 return NULL;
485 static const char *setup_discovered_git_dir(const char *gitdir,
486 char *cwd, int offset, int len,
487 int *nongit_ok)
489 if (check_repository_format_gently(gitdir, nongit_ok))
490 return NULL;
492 /* --work-tree is set without --git-dir; use discovered one */
493 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
494 if (offset != len && !is_absolute_path(gitdir))
495 gitdir = xstrdup(real_path(gitdir));
496 if (chdir(cwd))
497 die_errno("Could not come back to cwd");
498 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
501 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
502 if (is_bare_repository_cfg > 0) {
503 set_git_dir(offset == len ? gitdir : real_path(gitdir));
504 if (chdir(cwd))
505 die_errno("Could not come back to cwd");
506 return NULL;
509 /* #0, #1, #5, #8, #9, #12, #13 */
510 set_git_work_tree(".");
511 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
512 set_git_dir(gitdir);
513 inside_git_dir = 0;
514 inside_work_tree = 1;
515 if (offset == len)
516 return NULL;
518 /* Make "offset" point to past the '/', and add a '/' at the end */
519 offset++;
520 cwd[len++] = '/';
521 cwd[len] = 0;
522 return cwd + offset;
525 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
526 static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
528 int root_len;
530 if (check_repository_format_gently(".", nongit_ok))
531 return NULL;
533 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
535 /* --work-tree is set without --git-dir; use discovered one */
536 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
537 const char *gitdir;
539 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
540 if (chdir(cwd))
541 die_errno("Could not come back to cwd");
542 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
545 inside_git_dir = 1;
546 inside_work_tree = 0;
547 if (offset != len) {
548 if (chdir(cwd))
549 die_errno("Cannot come back to cwd");
550 root_len = offset_1st_component(cwd);
551 cwd[offset > root_len ? offset : root_len] = '\0';
552 set_git_dir(cwd);
554 else
555 set_git_dir(".");
556 return NULL;
559 static const char *setup_nongit(const char *cwd, int *nongit_ok)
561 if (!nongit_ok)
562 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
563 if (chdir(cwd))
564 die_errno("Cannot come back to cwd");
565 *nongit_ok = 1;
566 return NULL;
569 static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
571 struct stat buf;
572 if (stat(path, &buf)) {
573 die_errno("failed to stat '%*s%s%s'",
574 prefix_len,
575 prefix ? prefix : "",
576 prefix ? "/" : "", path);
578 return buf.st_dev;
582 * A "string_list_each_func_t" function that canonicalizes an entry
583 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
584 * discards it if unusable. The presence of an empty entry in
585 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
586 * subsequent entries.
588 static int canonicalize_ceiling_entry(struct string_list_item *item,
589 void *cb_data)
591 int *empty_entry_found = cb_data;
592 char *ceil = item->string;
594 if (!*ceil) {
595 *empty_entry_found = 1;
596 return 0;
597 } else if (!is_absolute_path(ceil)) {
598 return 0;
599 } else if (*empty_entry_found) {
600 /* Keep entry but do not canonicalize it */
601 return 1;
602 } else {
603 const char *real_path = real_path_if_valid(ceil);
604 if (!real_path)
605 return 0;
606 free(item->string);
607 item->string = xstrdup(real_path);
608 return 1;
613 * We cannot decide in this function whether we are in the work tree or
614 * not, since the config can only be read _after_ this function was called.
616 static const char *setup_git_directory_gently_1(int *nongit_ok)
618 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
619 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
620 static char cwd[PATH_MAX + 1];
621 const char *gitdirenv, *ret;
622 char *gitfile;
623 int len, offset, offset_parent, ceil_offset = -1;
624 dev_t current_device = 0;
625 int one_filesystem = 1;
628 * Let's assume that we are in a git repository.
629 * If it turns out later that we are somewhere else, the value will be
630 * updated accordingly.
632 if (nongit_ok)
633 *nongit_ok = 0;
635 if (!getcwd(cwd, sizeof(cwd) - 1))
636 die_errno("Unable to read current working directory");
637 offset = len = strlen(cwd);
640 * If GIT_DIR is set explicitly, we're not going
641 * to do any discovery, but we still do repository
642 * validation.
644 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
645 if (gitdirenv)
646 return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
648 if (env_ceiling_dirs) {
649 int empty_entry_found = 0;
651 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
652 filter_string_list(&ceiling_dirs, 0,
653 canonicalize_ceiling_entry, &empty_entry_found);
654 ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs);
655 string_list_clear(&ceiling_dirs, 0);
658 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
659 ceil_offset = 1;
662 * Test in the following order (relative to the cwd):
663 * - .git (file containing "gitdir: <path>")
664 * - .git/
665 * - ./ (bare)
666 * - ../.git
667 * - ../.git/
668 * - ../ (bare)
669 * - ../../.git/
670 * etc.
672 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
673 if (one_filesystem)
674 current_device = get_device_or_die(".", NULL, 0);
675 for (;;) {
676 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
677 if (gitfile)
678 gitdirenv = gitfile = xstrdup(gitfile);
679 else {
680 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
681 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
684 if (gitdirenv) {
685 ret = setup_discovered_git_dir(gitdirenv,
686 cwd, offset, len,
687 nongit_ok);
688 free(gitfile);
689 return ret;
691 free(gitfile);
693 if (is_git_directory("."))
694 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
696 offset_parent = offset;
697 while (--offset_parent > ceil_offset && cwd[offset_parent] != '/');
698 if (offset_parent <= ceil_offset)
699 return setup_nongit(cwd, nongit_ok);
700 if (one_filesystem) {
701 dev_t parent_device = get_device_or_die("..", cwd, offset);
702 if (parent_device != current_device) {
703 if (nongit_ok) {
704 if (chdir(cwd))
705 die_errno("Cannot come back to cwd");
706 *nongit_ok = 1;
707 return NULL;
709 cwd[offset] = '\0';
710 die("Not a git repository (or any parent up to mount point %s)\n"
711 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
714 if (chdir("..")) {
715 cwd[offset] = '\0';
716 die_errno("Cannot change to '%s/..'", cwd);
718 offset = offset_parent;
722 const char *setup_git_directory_gently(int *nongit_ok)
724 const char *prefix;
726 prefix = setup_git_directory_gently_1(nongit_ok);
727 if (prefix)
728 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
729 else
730 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
732 if (startup_info) {
733 startup_info->have_repository = !nongit_ok || !*nongit_ok;
734 startup_info->prefix = prefix;
736 return prefix;
739 int git_config_perm(const char *var, const char *value)
741 int i;
742 char *endptr;
744 if (value == NULL)
745 return PERM_GROUP;
747 if (!strcmp(value, "umask"))
748 return PERM_UMASK;
749 if (!strcmp(value, "group"))
750 return PERM_GROUP;
751 if (!strcmp(value, "all") ||
752 !strcmp(value, "world") ||
753 !strcmp(value, "everybody"))
754 return PERM_EVERYBODY;
756 /* Parse octal numbers */
757 i = strtol(value, &endptr, 8);
759 /* If not an octal number, maybe true/false? */
760 if (*endptr != 0)
761 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
764 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
765 * a chmod value to restrict to.
767 switch (i) {
768 case PERM_UMASK: /* 0 */
769 return PERM_UMASK;
770 case OLD_PERM_GROUP: /* 1 */
771 return PERM_GROUP;
772 case OLD_PERM_EVERYBODY: /* 2 */
773 return PERM_EVERYBODY;
776 /* A filemode value was given: 0xxx */
778 if ((i & 0600) != 0600)
779 die("Problem with core.sharedRepository filemode value "
780 "(0%.3o).\nThe owner of files must always have "
781 "read and write permissions.", i);
784 * Mask filemode value. Others can not get write permission.
785 * x flags for directories are handled separately.
787 return -(i & 0666);
790 int check_repository_format_version(const char *var, const char *value, void *cb)
792 if (strcmp(var, "core.repositoryformatversion") == 0)
793 repository_format_version = git_config_int(var, value);
794 else if (strcmp(var, "core.sharedrepository") == 0)
795 shared_repository = git_config_perm(var, value);
796 else if (strcmp(var, "core.bare") == 0) {
797 is_bare_repository_cfg = git_config_bool(var, value);
798 if (is_bare_repository_cfg == 1)
799 inside_work_tree = -1;
800 } else if (strcmp(var, "core.worktree") == 0) {
801 if (!value)
802 return config_error_nonbool(var);
803 free(git_work_tree_cfg);
804 git_work_tree_cfg = xstrdup(value);
805 inside_work_tree = -1;
807 return 0;
810 int check_repository_format(void)
812 return check_repository_format_gently(get_git_dir(), NULL);
816 * Returns the "prefix", a path to the current working directory
817 * relative to the work tree root, or NULL, if the current working
818 * directory is not a strict subdirectory of the work tree root. The
819 * prefix always ends with a '/' character.
821 const char *setup_git_directory(void)
823 return setup_git_directory_gently(NULL);
826 const char *resolve_gitdir(const char *suspect)
828 if (is_git_directory(suspect))
829 return suspect;
830 return read_gitfile(suspect);
833 /* if any standard file descriptor is missing open it to /dev/null */
834 void sanitize_stdfds(void)
836 int fd = open("/dev/null", O_RDWR, 0);
837 while (fd != -1 && fd < 2)
838 fd = dup(fd);
839 if (fd == -1)
840 die_errno("open /dev/null or dup failed");
841 if (fd > 2)
842 close(fd);
845 int daemonize(void)
847 #ifdef NO_POSIX_GOODIES
848 errno = ENOSYS;
849 return -1;
850 #else
851 switch (fork()) {
852 case 0:
853 break;
854 case -1:
855 die_errno("fork failed");
856 default:
857 exit(0);
859 if (setsid() == -1)
860 die_errno("setsid failed");
861 close(0);
862 close(1);
863 close(2);
864 sanitize_stdfds();
865 return 0;
866 #endif