3 #include "string-list.h"
5 static int inside_git_dir = -1;
6 static int inside_work_tree = -1;
7 static int work_tree_config_is_bogus;
9 static struct startup_info the_startup_info;
10 struct startup_info *startup_info = &the_startup_info;
13 * The input parameter must contain an absolute path, and it must already be
16 * Find the part of an absolute path that lies inside the work tree by
17 * dereferencing symlinks outside the work tree, for example:
18 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
19 * /dir/file (work tree is /) -> dir/file
20 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
21 * /dir/repolink/file (repolink points to /dir/repo) -> file
22 * /dir/repo (exactly equal to work tree) -> (empty string)
24 static int abspath_part_inside_repo(char *path)
30 const char *work_tree = get_git_work_tree();
34 wtlen = strlen(work_tree);
36 off = offset_1st_component(path);
38 /* check if work tree is already the prefix */
39 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
40 if (path[wtlen] == '/') {
41 memmove(path, path + wtlen + 1, len - wtlen);
43 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
44 /* work tree is the root, or the whole path */
45 memmove(path, path + wtlen, len - wtlen + 1);
48 /* work tree might match beginning of a symlink to work tree */
54 /* check each '/'-terminated level */
59 if (strcmp(real_path(path0), work_tree) == 0) {
60 memmove(path0, path + 1, len - (path - path0));
67 /* check whole path */
68 if (strcmp(real_path(path0), work_tree) == 0) {
77 * Normalize "path", prepending the "prefix" for relative paths. If
78 * remaining_prefix is not NULL, return the actual prefix still
79 * remains in the path. For example, prefix = sub1/sub2/ and path is
81 * foo -> sub1/sub2/foo (full prefix)
82 * ../foo -> sub1/foo (remaining prefix is sub1/)
83 * ../../bar -> bar (no remaining prefix)
84 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
85 * `pwd`/../bar -> sub1/bar (no remaining prefix)
87 char *prefix_path_gently(const char *prefix, int len,
88 int *remaining_prefix, const char *path)
90 const char *orig = path;
92 if (is_absolute_path(orig)) {
93 sanitized = xmallocz(strlen(path));
95 *remaining_prefix = 0;
96 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
100 if (abspath_part_inside_repo(sanitized)) {
105 sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path);
106 if (remaining_prefix)
107 *remaining_prefix = len;
108 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
116 char *prefix_path(const char *prefix, int len, const char *path)
118 char *r = prefix_path_gently(prefix, len, NULL, path);
120 die("'%s' is outside repository", path);
124 int path_inside_repo(const char *prefix, const char *path)
126 int len = prefix ? strlen(prefix) : 0;
127 char *r = prefix_path_gently(prefix, len, NULL, path);
135 int check_filename(const char *prefix, const char *arg)
137 char *to_free = NULL;
140 if (skip_prefix(arg, ":/", &arg)) {
141 if (!*arg) /* ":/" is root dir, always exists */
144 } else if (skip_prefix(arg, ":!", &arg) ||
145 skip_prefix(arg, ":^", &arg)) {
146 if (!*arg) /* excluding everything is silly, but allowed */
151 arg = to_free = prefix_filename(prefix, arg);
153 if (!lstat(arg, &st)) {
155 return 1; /* file exists */
157 if (is_missing_file_error(errno)) {
159 return 0; /* file does not exist */
161 die_errno("failed to stat '%s'", arg);
164 static void NORETURN die_verify_filename(const char *prefix,
166 int diagnose_misspelt_rev)
168 if (!diagnose_misspelt_rev)
169 die(_("%s: no such path in the working tree.\n"
170 "Use 'git <command> -- <path>...' to specify paths that do not exist locally."),
173 * Saying "'(icase)foo' does not exist in the index" when the
174 * user gave us ":(icase)foo" is just stupid. A magic pathspec
175 * begins with a colon and is followed by a non-alnum; do not
176 * let maybe_die_on_misspelt_object_name() even trigger.
178 if (!(arg[0] == ':' && !isalnum(arg[1])))
179 maybe_die_on_misspelt_object_name(arg, prefix);
181 /* ... or fall back the most general message. */
182 die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
183 "Use '--' to separate paths from revisions, like this:\n"
184 "'git <command> [<revision>...] -- [<file>...]'"), arg);
189 * Check for arguments that don't resolve as actual files,
190 * but which look sufficiently like pathspecs that we'll consider
191 * them such for the purposes of rev/pathspec DWIM parsing.
193 static int looks_like_pathspec(const char *arg)
195 /* anything with a wildcard character */
196 if (!no_wildcard(arg))
199 /* long-form pathspec magic */
200 if (starts_with(arg, ":("))
207 * Verify a filename that we got as an argument for a pathspec
208 * entry. Note that a filename that begins with "-" never verifies
209 * as true, because even if such a filename were to exist, we want
210 * it to be preceded by the "--" marker (or we want the user to
211 * use a format like "./-filename")
213 * The "diagnose_misspelt_rev" is used to provide a user-friendly
214 * diagnosis when dying upon finding that "name" is not a pathname.
215 * If set to 1, the diagnosis will try to diagnose "name" as an
216 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
217 * will only complain about an inexisting file.
219 * This function is typically called to check that a "file or rev"
220 * argument is unambiguous. In this case, the caller will want
221 * diagnose_misspelt_rev == 1 when verifying the first non-rev
222 * argument (which could have been a revision), and
223 * diagnose_misspelt_rev == 0 for the next ones (because we already
224 * saw a filename, there's not ambiguity anymore).
226 void verify_filename(const char *prefix,
228 int diagnose_misspelt_rev)
231 die("bad flag '%s' used after filename", arg);
232 if (looks_like_pathspec(arg) || check_filename(prefix, arg))
234 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
238 * Opposite of the above: the command line did not have -- marker
239 * and we parsed the arg as a refname. It should not be interpretable
242 void verify_non_filename(const char *prefix, const char *arg)
244 if (!is_inside_work_tree() || is_inside_git_dir())
248 if (!check_filename(prefix, arg))
250 die(_("ambiguous argument '%s': both revision and filename\n"
251 "Use '--' to separate paths from revisions, like this:\n"
252 "'git <command> [<revision>...] -- [<file>...]'"), arg);
255 int get_common_dir(struct strbuf *sb, const char *gitdir)
257 const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
258 if (git_env_common_dir) {
259 strbuf_addstr(sb, git_env_common_dir);
262 return get_common_dir_noenv(sb, gitdir);
266 int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)
268 struct strbuf data = STRBUF_INIT;
269 struct strbuf path = STRBUF_INIT;
272 strbuf_addf(&path, "%s/commondir", gitdir);
273 if (file_exists(path.buf)) {
274 if (strbuf_read_file(&data, path.buf, 0) <= 0)
275 die_errno(_("failed to read %s"), path.buf);
276 while (data.len && (data.buf[data.len - 1] == '\n' ||
277 data.buf[data.len - 1] == '\r'))
279 data.buf[data.len] = '\0';
281 if (!is_absolute_path(data.buf))
282 strbuf_addf(&path, "%s/", gitdir);
283 strbuf_addbuf(&path, &data);
284 strbuf_add_real_path(sb, path.buf);
287 strbuf_addstr(sb, gitdir);
290 strbuf_release(&data);
291 strbuf_release(&path);
296 * Test if it looks like we're at a git directory.
299 * - either an objects/ directory _or_ the proper
300 * GIT_OBJECT_DIRECTORY environment variable
301 * - a refs/ directory
302 * - either a HEAD symlink or a HEAD file that is formatted as
303 * a proper "ref:", or a regular file HEAD that has a properly
304 * formatted sha1 object name.
306 int is_git_directory(const char *suspect)
308 struct strbuf path = STRBUF_INIT;
312 /* Check worktree-related signatures */
313 strbuf_addf(&path, "%s/HEAD", suspect);
314 if (validate_headref(path.buf))
318 get_common_dir(&path, suspect);
321 /* Check non-worktree-related signatures */
322 if (getenv(DB_ENVIRONMENT)) {
323 if (access(getenv(DB_ENVIRONMENT), X_OK))
327 strbuf_setlen(&path, len);
328 strbuf_addstr(&path, "/objects");
329 if (access(path.buf, X_OK))
333 strbuf_setlen(&path, len);
334 strbuf_addstr(&path, "/refs");
335 if (access(path.buf, X_OK))
340 strbuf_release(&path);
344 int is_nonbare_repository_dir(struct strbuf *path)
348 size_t orig_path_len = path->len;
349 assert(orig_path_len != 0);
350 strbuf_complete(path, '/');
351 strbuf_addstr(path, ".git");
352 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
354 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
355 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
357 strbuf_setlen(path, orig_path_len);
361 int is_inside_git_dir(void)
363 if (inside_git_dir < 0)
364 inside_git_dir = is_inside_dir(get_git_dir());
365 return inside_git_dir;
368 int is_inside_work_tree(void)
370 if (inside_work_tree < 0)
371 inside_work_tree = is_inside_dir(get_git_work_tree());
372 return inside_work_tree;
375 void setup_work_tree(void)
377 const char *work_tree, *git_dir;
378 static int initialized = 0;
383 if (work_tree_config_is_bogus)
384 die("unable to set up work tree using invalid config");
386 work_tree = get_git_work_tree();
387 git_dir = get_git_dir();
388 if (!is_absolute_path(git_dir))
389 git_dir = real_path(get_git_dir());
390 if (!work_tree || chdir(work_tree))
391 die("This operation must be run in a work tree");
394 * Make sure subsequent git processes find correct worktree
395 * if $GIT_WORK_TREE is set relative
397 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
398 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
400 set_git_dir(remove_leading_path(git_dir, work_tree));
404 static int check_repo_format(const char *var, const char *value, void *vdata)
406 struct repository_format *data = vdata;
409 if (strcmp(var, "core.repositoryformatversion") == 0)
410 data->version = git_config_int(var, value);
411 else if (skip_prefix(var, "extensions.", &ext)) {
413 * record any known extensions here; otherwise,
414 * we fall through to recording it as unknown, and
415 * check_repository_format will complain
417 if (!strcmp(ext, "noop"))
419 else if (!strcmp(ext, "preciousobjects"))
420 data->precious_objects = git_config_bool(var, value);
422 string_list_append(&data->unknown_extensions, ext);
423 } else if (strcmp(var, "core.bare") == 0) {
424 data->is_bare = git_config_bool(var, value);
425 } else if (strcmp(var, "core.worktree") == 0) {
427 return config_error_nonbool(var);
428 data->work_tree = xstrdup(value);
433 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
435 struct strbuf sb = STRBUF_INIT;
436 struct strbuf err = STRBUF_INIT;
437 struct repository_format candidate;
440 has_common = get_common_dir(&sb, gitdir);
441 strbuf_addstr(&sb, "/config");
442 read_repository_format(&candidate, sb.buf);
446 * For historical use of check_repository_format() in git-init,
447 * we treat a missing config as a silent "ok", even when nongit_ok
450 if (candidate.version < 0)
453 if (verify_repository_format(&candidate, &err) < 0) {
455 warning("%s", err.buf);
456 strbuf_release(&err);
463 repository_format_precious_objects = candidate.precious_objects;
464 string_list_clear(&candidate.unknown_extensions, 0);
466 if (candidate.is_bare != -1) {
467 is_bare_repository_cfg = candidate.is_bare;
468 if (is_bare_repository_cfg == 1)
469 inside_work_tree = -1;
471 if (candidate.work_tree) {
472 free(git_work_tree_cfg);
473 git_work_tree_cfg = candidate.work_tree;
474 inside_work_tree = -1;
477 free(candidate.work_tree);
483 int read_repository_format(struct repository_format *format, const char *path)
485 memset(format, 0, sizeof(*format));
486 format->version = -1;
487 format->is_bare = -1;
488 string_list_init(&format->unknown_extensions, 1);
489 git_config_from_file(check_repo_format, path, format);
490 return format->version;
493 int verify_repository_format(const struct repository_format *format,
496 if (GIT_REPO_VERSION_READ < format->version) {
497 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
498 GIT_REPO_VERSION_READ, format->version);
502 if (format->version >= 1 && format->unknown_extensions.nr) {
505 strbuf_addstr(err, _("unknown repository extensions found:"));
507 for (i = 0; i < format->unknown_extensions.nr; i++)
508 strbuf_addf(err, "\n\t%s",
509 format->unknown_extensions.items[i].string);
516 void read_gitfile_error_die(int error_code, const char *path, const char *dir)
518 switch (error_code) {
519 case READ_GITFILE_ERR_STAT_FAILED:
520 case READ_GITFILE_ERR_NOT_A_FILE:
521 /* non-fatal; follow return path */
523 case READ_GITFILE_ERR_OPEN_FAILED:
524 die_errno("Error opening '%s'", path);
525 case READ_GITFILE_ERR_TOO_LARGE:
526 die("Too large to be a .git file: '%s'", path);
527 case READ_GITFILE_ERR_READ_FAILED:
528 die("Error reading %s", path);
529 case READ_GITFILE_ERR_INVALID_FORMAT:
530 die("Invalid gitfile format: %s", path);
531 case READ_GITFILE_ERR_NO_PATH:
532 die("No path in gitfile: %s", path);
533 case READ_GITFILE_ERR_NOT_A_REPO:
534 die("Not a git repository: %s", dir);
536 die("BUG: unknown error code");
541 * Try to read the location of the git directory from the .git file,
542 * return path to git directory if found.
544 * On failure, if return_error_code is not NULL, return_error_code
545 * will be set to an error code and NULL will be returned. If
546 * return_error_code is NULL the function will die instead (for most
549 const char *read_gitfile_gently(const char *path, int *return_error_code)
551 const int max_file_size = 1 << 20; /* 1MB */
560 if (stat(path, &st)) {
561 /* NEEDSWORK: discern between ENOENT vs other errors */
562 error_code = READ_GITFILE_ERR_STAT_FAILED;
565 if (!S_ISREG(st.st_mode)) {
566 error_code = READ_GITFILE_ERR_NOT_A_FILE;
569 if (st.st_size > max_file_size) {
570 error_code = READ_GITFILE_ERR_TOO_LARGE;
573 fd = open(path, O_RDONLY);
575 error_code = READ_GITFILE_ERR_OPEN_FAILED;
578 buf = xmallocz(st.st_size);
579 len = read_in_full(fd, buf, st.st_size);
581 if (len != st.st_size) {
582 error_code = READ_GITFILE_ERR_READ_FAILED;
585 if (!starts_with(buf, "gitdir: ")) {
586 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
589 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
592 error_code = READ_GITFILE_ERR_NO_PATH;
598 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
599 size_t pathlen = slash+1 - path;
600 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
601 (int)(len - 8), buf + 8);
605 if (!is_git_directory(dir)) {
606 error_code = READ_GITFILE_ERR_NOT_A_REPO;
609 path = real_path(dir);
612 if (return_error_code)
613 *return_error_code = error_code;
615 read_gitfile_error_die(error_code, path, dir);
618 return error_code ? NULL : path;
621 static const char *setup_explicit_git_dir(const char *gitdirenv,
625 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
626 const char *worktree;
630 if (PATH_MAX - 40 < strlen(gitdirenv))
631 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
633 gitfile = (char*)read_gitfile(gitdirenv);
635 gitfile = xstrdup(gitfile);
639 if (!is_git_directory(gitdirenv)) {
645 die("Not a git repository: '%s'", gitdirenv);
648 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
653 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
655 set_git_work_tree(work_tree_env);
656 else if (is_bare_repository_cfg > 0) {
657 if (git_work_tree_cfg) {
659 warning("core.bare and core.worktree do not make sense");
660 work_tree_config_is_bogus = 1;
664 set_git_dir(gitdirenv);
668 else if (git_work_tree_cfg) { /* #6, #14 */
669 if (is_absolute_path(git_work_tree_cfg))
670 set_git_work_tree(git_work_tree_cfg);
673 if (chdir(gitdirenv))
674 die_errno("Could not chdir to '%s'", gitdirenv);
675 if (chdir(git_work_tree_cfg))
676 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
677 core_worktree = xgetcwd();
679 die_errno("Could not come back to cwd");
680 set_git_work_tree(core_worktree);
684 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
686 set_git_dir(gitdirenv);
691 set_git_work_tree(".");
693 /* set_git_work_tree() must have been called by now */
694 worktree = get_git_work_tree();
696 /* both get_git_work_tree() and cwd are already normalized */
697 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
698 set_git_dir(gitdirenv);
703 offset = dir_inside_of(cwd->buf, worktree);
704 if (offset >= 0) { /* cwd inside worktree? */
705 set_git_dir(real_path(gitdirenv));
707 die_errno("Could not chdir to '%s'", worktree);
708 strbuf_addch(cwd, '/');
710 return cwd->buf + offset;
713 /* cwd outside worktree */
714 set_git_dir(gitdirenv);
719 static const char *setup_discovered_git_dir(const char *gitdir,
720 struct strbuf *cwd, int offset,
723 if (check_repository_format_gently(gitdir, nongit_ok))
726 /* --work-tree is set without --git-dir; use discovered one */
727 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
728 char *to_free = NULL;
731 if (offset != cwd->len && !is_absolute_path(gitdir))
732 gitdir = to_free = real_pathdup(gitdir, 1);
734 die_errno("Could not come back to cwd");
735 ret = setup_explicit_git_dir(gitdir, cwd, nongit_ok);
740 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
741 if (is_bare_repository_cfg > 0) {
742 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
744 die_errno("Could not come back to cwd");
748 /* #0, #1, #5, #8, #9, #12, #13 */
749 set_git_work_tree(".");
750 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
753 inside_work_tree = 1;
754 if (offset == cwd->len)
757 /* Make "offset" point past the '/' (already the case for root dirs) */
758 if (offset != offset_1st_component(cwd->buf))
760 /* Add a '/' at the end */
761 strbuf_addch(cwd, '/');
762 return cwd->buf + offset;
765 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
766 static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
771 if (check_repository_format_gently(".", nongit_ok))
774 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
776 /* --work-tree is set without --git-dir; use discovered one */
777 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
778 static const char *gitdir;
780 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
782 die_errno("Could not come back to cwd");
783 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
787 inside_work_tree = 0;
788 if (offset != cwd->len) {
790 die_errno("Cannot come back to cwd");
791 root_len = offset_1st_component(cwd->buf);
792 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
793 set_git_dir(cwd->buf);
800 static const char *setup_nongit(const char *cwd, int *nongit_ok)
803 die(_("Not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
805 die_errno(_("Cannot come back to cwd"));
810 static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
813 if (stat(path, &buf)) {
814 die_errno("failed to stat '%*s%s%s'",
816 prefix ? prefix : "",
817 prefix ? "/" : "", path);
823 * A "string_list_each_func_t" function that canonicalizes an entry
824 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
825 * discards it if unusable. The presence of an empty entry in
826 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
827 * subsequent entries.
829 static int canonicalize_ceiling_entry(struct string_list_item *item,
832 int *empty_entry_found = cb_data;
833 char *ceil = item->string;
836 *empty_entry_found = 1;
838 } else if (!is_absolute_path(ceil)) {
840 } else if (*empty_entry_found) {
841 /* Keep entry but do not canonicalize it */
844 char *real_path = real_pathdup(ceil, 0);
849 item->string = real_path;
854 enum discovery_result {
859 /* these are errors */
860 GIT_DIR_HIT_CEILING = -1,
861 GIT_DIR_HIT_MOUNT_POINT = -2,
862 GIT_DIR_INVALID_GITFILE = -3
866 * We cannot decide in this function whether we are in the work tree or
867 * not, since the config can only be read _after_ this function was called.
869 * Also, we avoid changing any global state (such as the current working
870 * directory) to allow early callers.
872 * The directory where the search should start needs to be passed in via the
873 * `dir` parameter; upon return, the `dir` buffer will contain the path of
874 * the directory where the search ended, and `gitdir` will contain the path of
875 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it
876 * is relative to `dir` (i.e. *not* necessarily the cwd).
878 static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
879 struct strbuf *gitdir,
882 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
883 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
884 const char *gitdirenv;
885 int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1;
886 dev_t current_device = 0;
887 int one_filesystem = 1;
890 * If GIT_DIR is set explicitly, we're not going
891 * to do any discovery, but we still do repository
894 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
896 strbuf_addstr(gitdir, gitdirenv);
897 return GIT_DIR_EXPLICIT;
900 if (env_ceiling_dirs) {
901 int empty_entry_found = 0;
903 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
904 filter_string_list(&ceiling_dirs, 0,
905 canonicalize_ceiling_entry, &empty_entry_found);
906 ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs);
907 string_list_clear(&ceiling_dirs, 0);
911 ceil_offset = min_offset - 2;
914 * Test in the following order (relative to the dir):
915 * - .git (file containing "gitdir: <path>")
924 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
926 current_device = get_device_or_die(dir->buf, NULL, 0);
928 int offset = dir->len, error_code = 0;
930 if (offset > min_offset)
931 strbuf_addch(dir, '/');
932 strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
933 gitdirenv = read_gitfile_gently(dir->buf, die_on_error ?
937 error_code == READ_GITFILE_ERR_NOT_A_FILE) {
938 /* NEEDSWORK: fail if .git is not file nor dir */
939 if (is_git_directory(dir->buf))
940 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
941 } else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
942 return GIT_DIR_INVALID_GITFILE;
944 strbuf_setlen(dir, offset);
946 strbuf_addstr(gitdir, gitdirenv);
947 return GIT_DIR_DISCOVERED;
950 if (is_git_directory(dir->buf)) {
951 strbuf_addstr(gitdir, ".");
955 if (offset <= min_offset)
956 return GIT_DIR_HIT_CEILING;
958 while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset]))
960 if (offset <= ceil_offset)
961 return GIT_DIR_HIT_CEILING;
963 strbuf_setlen(dir, offset > min_offset ? offset : min_offset);
964 if (one_filesystem &&
965 current_device != get_device_or_die(dir->buf, NULL, offset))
966 return GIT_DIR_HIT_MOUNT_POINT;
970 const char *discover_git_directory(struct strbuf *gitdir)
972 struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
973 size_t gitdir_offset = gitdir->len, cwd_len;
974 struct repository_format candidate;
976 if (strbuf_getcwd(&dir))
980 if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) {
981 strbuf_release(&dir);
986 * The returned gitdir is relative to dir, and if dir does not reflect
987 * the current working directory, we simply make the gitdir absolute.
989 if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) {
990 /* Avoid a trailing "/." */
991 if (!strcmp(".", gitdir->buf + gitdir_offset))
992 strbuf_setlen(gitdir, gitdir_offset);
994 strbuf_addch(&dir, '/');
995 strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
999 strbuf_addf(&dir, "%s/config", gitdir->buf + gitdir_offset);
1000 read_repository_format(&candidate, dir.buf);
1001 strbuf_release(&dir);
1003 if (verify_repository_format(&candidate, &err) < 0) {
1004 warning("ignoring git dir '%s': %s",
1005 gitdir->buf + gitdir_offset, err.buf);
1006 strbuf_release(&err);
1010 return gitdir->buf + gitdir_offset;
1013 const char *setup_git_directory_gently(int *nongit_ok)
1015 static struct strbuf cwd = STRBUF_INIT;
1016 struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
1017 const char *prefix, *env_prefix;
1020 * We may have read an incomplete configuration before
1021 * setting-up the git directory. If so, clear the cache so
1022 * that the next queries to the configuration reload complete
1023 * configuration (including the per-repo config file that we
1024 * ignored previously).
1029 * Let's assume that we are in a git repository.
1030 * If it turns out later that we are somewhere else, the value will be
1031 * updated accordingly.
1036 if (strbuf_getcwd(&cwd))
1037 die_errno(_("Unable to read current working directory"));
1038 strbuf_addbuf(&dir, &cwd);
1040 switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) {
1044 case GIT_DIR_EXPLICIT:
1045 prefix = setup_explicit_git_dir(gitdir.buf, &cwd, nongit_ok);
1047 case GIT_DIR_DISCOVERED:
1048 if (dir.len < cwd.len && chdir(dir.buf))
1049 die(_("Cannot change to '%s'"), dir.buf);
1050 prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
1054 if (dir.len < cwd.len && chdir(dir.buf))
1055 die(_("Cannot change to '%s'"), dir.buf);
1056 prefix = setup_bare_git_dir(&cwd, dir.len, nongit_ok);
1058 case GIT_DIR_HIT_CEILING:
1059 prefix = setup_nongit(cwd.buf, nongit_ok);
1061 case GIT_DIR_HIT_MOUNT_POINT:
1064 strbuf_release(&cwd);
1065 strbuf_release(&dir);
1068 die(_("Not a git repository (or any parent up to mount point %s)\n"
1069 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
1072 die("BUG: unhandled setup_git_directory_1() result");
1075 env_prefix = getenv(GIT_TOPLEVEL_PREFIX_ENVIRONMENT);
1077 prefix = env_prefix;
1080 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1082 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1084 startup_info->have_repository = !nongit_ok || !*nongit_ok;
1085 startup_info->prefix = prefix;
1087 strbuf_release(&dir);
1088 strbuf_release(&gitdir);
1093 int git_config_perm(const char *var, const char *value)
1101 if (!strcmp(value, "umask"))
1103 if (!strcmp(value, "group"))
1105 if (!strcmp(value, "all") ||
1106 !strcmp(value, "world") ||
1107 !strcmp(value, "everybody"))
1108 return PERM_EVERYBODY;
1110 /* Parse octal numbers */
1111 i = strtol(value, &endptr, 8);
1113 /* If not an octal number, maybe true/false? */
1115 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
1118 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
1119 * a chmod value to restrict to.
1122 case PERM_UMASK: /* 0 */
1124 case OLD_PERM_GROUP: /* 1 */
1126 case OLD_PERM_EVERYBODY: /* 2 */
1127 return PERM_EVERYBODY;
1130 /* A filemode value was given: 0xxx */
1132 if ((i & 0600) != 0600)
1133 die(_("Problem with core.sharedRepository filemode value "
1134 "(0%.3o).\nThe owner of files must always have "
1135 "read and write permissions."), i);
1138 * Mask filemode value. Others can not get write permission.
1139 * x flags for directories are handled separately.
1144 void check_repository_format(void)
1146 check_repository_format_gently(get_git_dir(), NULL);
1147 startup_info->have_repository = 1;
1151 * Returns the "prefix", a path to the current working directory
1152 * relative to the work tree root, or NULL, if the current working
1153 * directory is not a strict subdirectory of the work tree root. The
1154 * prefix always ends with a '/' character.
1156 const char *setup_git_directory(void)
1158 return setup_git_directory_gently(NULL);
1161 const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
1163 if (is_git_directory(suspect))
1165 return read_gitfile_gently(suspect, return_error_code);
1168 /* if any standard file descriptor is missing open it to /dev/null */
1169 void sanitize_stdfds(void)
1171 int fd = open("/dev/null", O_RDWR, 0);
1172 while (fd != -1 && fd < 2)
1175 die_errno("open /dev/null or dup failed");
1182 #ifdef NO_POSIX_GOODIES
1190 die_errno("fork failed");
1195 die_errno("setsid failed");