4 #include "string-list.h"
6 static int inside_git_dir = -1;
7 static int inside_work_tree = -1;
8 static int work_tree_config_is_bogus;
10 static struct startup_info the_startup_info;
11 struct startup_info *startup_info = &the_startup_info;
14 * The input parameter must contain an absolute path, and it must already be
17 * Find the part of an absolute path that lies inside the work tree by
18 * dereferencing symlinks outside the work tree, for example:
19 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
20 * /dir/file (work tree is /) -> dir/file
21 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
22 * /dir/repolink/file (repolink points to /dir/repo) -> file
23 * /dir/repo (exactly equal to work tree) -> (empty string)
25 static int abspath_part_inside_repo(char *path)
31 const char *work_tree = get_git_work_tree();
35 wtlen = strlen(work_tree);
37 off = offset_1st_component(path);
39 /* check if work tree is already the prefix */
40 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
41 if (path[wtlen] == '/') {
42 memmove(path, path + wtlen + 1, len - wtlen);
44 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
45 /* work tree is the root, or the whole path */
46 memmove(path, path + wtlen, len - wtlen + 1);
49 /* work tree might match beginning of a symlink to work tree */
55 /* check each '/'-terminated level */
60 if (strcmp(real_path(path0), work_tree) == 0) {
61 memmove(path0, path + 1, len - (path - path0));
68 /* check whole path */
69 if (strcmp(real_path(path0), work_tree) == 0) {
78 * Normalize "path", prepending the "prefix" for relative paths. If
79 * remaining_prefix is not NULL, return the actual prefix still
80 * remains in the path. For example, prefix = sub1/sub2/ and path is
82 * foo -> sub1/sub2/foo (full prefix)
83 * ../foo -> sub1/foo (remaining prefix is sub1/)
84 * ../../bar -> bar (no remaining prefix)
85 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
86 * `pwd`/../bar -> sub1/bar (no remaining prefix)
88 char *prefix_path_gently(const char *prefix, int len,
89 int *remaining_prefix, const char *path)
91 const char *orig = path;
93 if (is_absolute_path(orig)) {
94 sanitized = xmallocz(strlen(path));
96 *remaining_prefix = 0;
97 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
101 if (abspath_part_inside_repo(sanitized)) {
106 sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path);
107 if (remaining_prefix)
108 *remaining_prefix = len;
109 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
117 char *prefix_path(const char *prefix, int len, const char *path)
119 char *r = prefix_path_gently(prefix, len, NULL, path);
121 die("'%s' is outside repository", path);
125 int path_inside_repo(const char *prefix, const char *path)
127 int len = prefix ? strlen(prefix) : 0;
128 char *r = prefix_path_gently(prefix, len, NULL, path);
136 int check_filename(const char *prefix, const char *arg)
138 char *to_free = NULL;
141 if (skip_prefix(arg, ":/", &arg)) {
142 if (!*arg) /* ":/" is root dir, always exists */
145 } else if (skip_prefix(arg, ":!", &arg) ||
146 skip_prefix(arg, ":^", &arg)) {
147 if (!*arg) /* excluding everything is silly, but allowed */
152 arg = to_free = prefix_filename(prefix, arg);
154 if (!lstat(arg, &st)) {
156 return 1; /* file exists */
158 if (is_missing_file_error(errno)) {
160 return 0; /* file does not exist */
162 die_errno("failed to stat '%s'", arg);
165 static void NORETURN die_verify_filename(const char *prefix,
167 int diagnose_misspelt_rev)
169 if (!diagnose_misspelt_rev)
170 die(_("%s: no such path in the working tree.\n"
171 "Use 'git <command> -- <path>...' to specify paths that do not exist locally."),
174 * Saying "'(icase)foo' does not exist in the index" when the
175 * user gave us ":(icase)foo" is just stupid. A magic pathspec
176 * begins with a colon and is followed by a non-alnum; do not
177 * let maybe_die_on_misspelt_object_name() even trigger.
179 if (!(arg[0] == ':' && !isalnum(arg[1])))
180 maybe_die_on_misspelt_object_name(arg, prefix);
182 /* ... or fall back the most general message. */
183 die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
184 "Use '--' to separate paths from revisions, like this:\n"
185 "'git <command> [<revision>...] -- [<file>...]'"), arg);
190 * Check for arguments that don't resolve as actual files,
191 * but which look sufficiently like pathspecs that we'll consider
192 * them such for the purposes of rev/pathspec DWIM parsing.
194 static int looks_like_pathspec(const char *arg)
196 /* anything with a wildcard character */
197 if (!no_wildcard(arg))
200 /* long-form pathspec magic */
201 if (starts_with(arg, ":("))
208 * Verify a filename that we got as an argument for a pathspec
209 * entry. Note that a filename that begins with "-" never verifies
210 * as true, because even if such a filename were to exist, we want
211 * it to be preceded by the "--" marker (or we want the user to
212 * use a format like "./-filename")
214 * The "diagnose_misspelt_rev" is used to provide a user-friendly
215 * diagnosis when dying upon finding that "name" is not a pathname.
216 * If set to 1, the diagnosis will try to diagnose "name" as an
217 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
218 * will only complain about an inexisting file.
220 * This function is typically called to check that a "file or rev"
221 * argument is unambiguous. In this case, the caller will want
222 * diagnose_misspelt_rev == 1 when verifying the first non-rev
223 * argument (which could have been a revision), and
224 * diagnose_misspelt_rev == 0 for the next ones (because we already
225 * saw a filename, there's not ambiguity anymore).
227 void verify_filename(const char *prefix,
229 int diagnose_misspelt_rev)
232 die("bad flag '%s' used after filename", arg);
233 if (looks_like_pathspec(arg) || check_filename(prefix, arg))
235 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
239 * Opposite of the above: the command line did not have -- marker
240 * and we parsed the arg as a refname. It should not be interpretable
243 void verify_non_filename(const char *prefix, const char *arg)
245 if (!is_inside_work_tree() || is_inside_git_dir())
249 if (!check_filename(prefix, arg))
251 die(_("ambiguous argument '%s': both revision and filename\n"
252 "Use '--' to separate paths from revisions, like this:\n"
253 "'git <command> [<revision>...] -- [<file>...]'"), arg);
256 int get_common_dir(struct strbuf *sb, const char *gitdir)
258 const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
259 if (git_env_common_dir) {
260 strbuf_addstr(sb, git_env_common_dir);
263 return get_common_dir_noenv(sb, gitdir);
267 int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)
269 struct strbuf data = STRBUF_INIT;
270 struct strbuf path = STRBUF_INIT;
273 strbuf_addf(&path, "%s/commondir", gitdir);
274 if (file_exists(path.buf)) {
275 if (strbuf_read_file(&data, path.buf, 0) <= 0)
276 die_errno(_("failed to read %s"), path.buf);
277 while (data.len && (data.buf[data.len - 1] == '\n' ||
278 data.buf[data.len - 1] == '\r'))
280 data.buf[data.len] = '\0';
282 if (!is_absolute_path(data.buf))
283 strbuf_addf(&path, "%s/", gitdir);
284 strbuf_addbuf(&path, &data);
285 strbuf_add_real_path(sb, path.buf);
288 strbuf_addstr(sb, gitdir);
291 strbuf_release(&data);
292 strbuf_release(&path);
297 * Test if it looks like we're at a git directory.
300 * - either an objects/ directory _or_ the proper
301 * GIT_OBJECT_DIRECTORY environment variable
302 * - a refs/ directory
303 * - either a HEAD symlink or a HEAD file that is formatted as
304 * a proper "ref:", or a regular file HEAD that has a properly
305 * formatted sha1 object name.
307 int is_git_directory(const char *suspect)
309 struct strbuf path = STRBUF_INIT;
313 /* Check worktree-related signatures */
314 strbuf_addf(&path, "%s/HEAD", suspect);
315 if (validate_headref(path.buf))
319 get_common_dir(&path, suspect);
322 /* Check non-worktree-related signatures */
323 if (getenv(DB_ENVIRONMENT)) {
324 if (access(getenv(DB_ENVIRONMENT), X_OK))
328 strbuf_setlen(&path, len);
329 strbuf_addstr(&path, "/objects");
330 if (access(path.buf, X_OK))
334 strbuf_setlen(&path, len);
335 strbuf_addstr(&path, "/refs");
336 if (access(path.buf, X_OK))
341 strbuf_release(&path);
345 int is_nonbare_repository_dir(struct strbuf *path)
349 size_t orig_path_len = path->len;
350 assert(orig_path_len != 0);
351 strbuf_complete(path, '/');
352 strbuf_addstr(path, ".git");
353 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
355 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
356 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
358 strbuf_setlen(path, orig_path_len);
362 int is_inside_git_dir(void)
364 if (inside_git_dir < 0)
365 inside_git_dir = is_inside_dir(get_git_dir());
366 return inside_git_dir;
369 int is_inside_work_tree(void)
371 if (inside_work_tree < 0)
372 inside_work_tree = is_inside_dir(get_git_work_tree());
373 return inside_work_tree;
376 void setup_work_tree(void)
378 const char *work_tree, *git_dir;
379 static int initialized = 0;
384 if (work_tree_config_is_bogus)
385 die("unable to set up work tree using invalid config");
387 work_tree = get_git_work_tree();
388 git_dir = get_git_dir();
389 if (!is_absolute_path(git_dir))
390 git_dir = real_path(get_git_dir());
391 if (!work_tree || chdir(work_tree))
392 die("This operation must be run in a work tree");
395 * Make sure subsequent git processes find correct worktree
396 * if $GIT_WORK_TREE is set relative
398 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
399 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
401 set_git_dir(remove_leading_path(git_dir, work_tree));
405 static int check_repo_format(const char *var, const char *value, void *vdata)
407 struct repository_format *data = vdata;
410 if (strcmp(var, "core.repositoryformatversion") == 0)
411 data->version = git_config_int(var, value);
412 else if (skip_prefix(var, "extensions.", &ext)) {
414 * record any known extensions here; otherwise,
415 * we fall through to recording it as unknown, and
416 * check_repository_format will complain
418 if (!strcmp(ext, "noop"))
420 else if (!strcmp(ext, "preciousobjects"))
421 data->precious_objects = git_config_bool(var, value);
423 string_list_append(&data->unknown_extensions, ext);
424 } else if (strcmp(var, "core.bare") == 0) {
425 data->is_bare = git_config_bool(var, value);
426 } else if (strcmp(var, "core.worktree") == 0) {
428 return config_error_nonbool(var);
429 data->work_tree = xstrdup(value);
434 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
436 struct strbuf sb = STRBUF_INIT;
437 struct strbuf err = STRBUF_INIT;
438 struct repository_format candidate;
441 has_common = get_common_dir(&sb, gitdir);
442 strbuf_addstr(&sb, "/config");
443 read_repository_format(&candidate, sb.buf);
447 * For historical use of check_repository_format() in git-init,
448 * we treat a missing config as a silent "ok", even when nongit_ok
451 if (candidate.version < 0)
454 if (verify_repository_format(&candidate, &err) < 0) {
456 warning("%s", err.buf);
457 strbuf_release(&err);
464 repository_format_precious_objects = candidate.precious_objects;
465 string_list_clear(&candidate.unknown_extensions, 0);
467 if (candidate.is_bare != -1) {
468 is_bare_repository_cfg = candidate.is_bare;
469 if (is_bare_repository_cfg == 1)
470 inside_work_tree = -1;
472 if (candidate.work_tree) {
473 free(git_work_tree_cfg);
474 git_work_tree_cfg = candidate.work_tree;
475 inside_work_tree = -1;
478 free(candidate.work_tree);
484 int read_repository_format(struct repository_format *format, const char *path)
486 memset(format, 0, sizeof(*format));
487 format->version = -1;
488 format->is_bare = -1;
489 string_list_init(&format->unknown_extensions, 1);
490 git_config_from_file(check_repo_format, path, format);
491 return format->version;
494 int verify_repository_format(const struct repository_format *format,
497 if (GIT_REPO_VERSION_READ < format->version) {
498 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
499 GIT_REPO_VERSION_READ, format->version);
503 if (format->version >= 1 && format->unknown_extensions.nr) {
506 strbuf_addstr(err, _("unknown repository extensions found:"));
508 for (i = 0; i < format->unknown_extensions.nr; i++)
509 strbuf_addf(err, "\n\t%s",
510 format->unknown_extensions.items[i].string);
517 void read_gitfile_error_die(int error_code, const char *path, const char *dir)
519 switch (error_code) {
520 case READ_GITFILE_ERR_STAT_FAILED:
521 case READ_GITFILE_ERR_NOT_A_FILE:
522 /* non-fatal; follow return path */
524 case READ_GITFILE_ERR_OPEN_FAILED:
525 die_errno("Error opening '%s'", path);
526 case READ_GITFILE_ERR_TOO_LARGE:
527 die("Too large to be a .git file: '%s'", path);
528 case READ_GITFILE_ERR_READ_FAILED:
529 die("Error reading %s", path);
530 case READ_GITFILE_ERR_INVALID_FORMAT:
531 die("Invalid gitfile format: %s", path);
532 case READ_GITFILE_ERR_NO_PATH:
533 die("No path in gitfile: %s", path);
534 case READ_GITFILE_ERR_NOT_A_REPO:
535 die("Not a git repository: %s", dir);
537 die("BUG: unknown error code");
542 * Try to read the location of the git directory from the .git file,
543 * return path to git directory if found.
545 * On failure, if return_error_code is not NULL, return_error_code
546 * will be set to an error code and NULL will be returned. If
547 * return_error_code is NULL the function will die instead (for most
550 const char *read_gitfile_gently(const char *path, int *return_error_code)
552 const int max_file_size = 1 << 20; /* 1MB */
561 if (stat(path, &st)) {
562 /* NEEDSWORK: discern between ENOENT vs other errors */
563 error_code = READ_GITFILE_ERR_STAT_FAILED;
566 if (!S_ISREG(st.st_mode)) {
567 error_code = READ_GITFILE_ERR_NOT_A_FILE;
570 if (st.st_size > max_file_size) {
571 error_code = READ_GITFILE_ERR_TOO_LARGE;
574 fd = open(path, O_RDONLY);
576 error_code = READ_GITFILE_ERR_OPEN_FAILED;
579 buf = xmallocz(st.st_size);
580 len = read_in_full(fd, buf, st.st_size);
582 if (len != st.st_size) {
583 error_code = READ_GITFILE_ERR_READ_FAILED;
586 if (!starts_with(buf, "gitdir: ")) {
587 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
590 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
593 error_code = READ_GITFILE_ERR_NO_PATH;
599 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
600 size_t pathlen = slash+1 - path;
601 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
602 (int)(len - 8), buf + 8);
606 if (!is_git_directory(dir)) {
607 error_code = READ_GITFILE_ERR_NOT_A_REPO;
610 path = real_path(dir);
613 if (return_error_code)
614 *return_error_code = error_code;
616 read_gitfile_error_die(error_code, path, dir);
619 return error_code ? NULL : path;
622 static const char *setup_explicit_git_dir(const char *gitdirenv,
626 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
627 const char *worktree;
631 if (PATH_MAX - 40 < strlen(gitdirenv))
632 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
634 gitfile = (char*)read_gitfile(gitdirenv);
636 gitfile = xstrdup(gitfile);
640 if (!is_git_directory(gitdirenv)) {
646 die("Not a git repository: '%s'", gitdirenv);
649 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
654 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
656 set_git_work_tree(work_tree_env);
657 else if (is_bare_repository_cfg > 0) {
658 if (git_work_tree_cfg) {
660 warning("core.bare and core.worktree do not make sense");
661 work_tree_config_is_bogus = 1;
665 set_git_dir(gitdirenv);
669 else if (git_work_tree_cfg) { /* #6, #14 */
670 if (is_absolute_path(git_work_tree_cfg))
671 set_git_work_tree(git_work_tree_cfg);
674 if (chdir(gitdirenv))
675 die_errno("Could not chdir to '%s'", gitdirenv);
676 if (chdir(git_work_tree_cfg))
677 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
678 core_worktree = xgetcwd();
680 die_errno("Could not come back to cwd");
681 set_git_work_tree(core_worktree);
685 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
687 set_git_dir(gitdirenv);
692 set_git_work_tree(".");
694 /* set_git_work_tree() must have been called by now */
695 worktree = get_git_work_tree();
697 /* both get_git_work_tree() and cwd are already normalized */
698 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
699 set_git_dir(gitdirenv);
704 offset = dir_inside_of(cwd->buf, worktree);
705 if (offset >= 0) { /* cwd inside worktree? */
706 set_git_dir(real_path(gitdirenv));
708 die_errno("Could not chdir to '%s'", worktree);
709 strbuf_addch(cwd, '/');
711 return cwd->buf + offset;
714 /* cwd outside worktree */
715 set_git_dir(gitdirenv);
720 static const char *setup_discovered_git_dir(const char *gitdir,
721 struct strbuf *cwd, int offset,
724 if (check_repository_format_gently(gitdir, nongit_ok))
727 /* --work-tree is set without --git-dir; use discovered one */
728 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
729 char *to_free = NULL;
732 if (offset != cwd->len && !is_absolute_path(gitdir))
733 gitdir = to_free = real_pathdup(gitdir, 1);
735 die_errno("Could not come back to cwd");
736 ret = setup_explicit_git_dir(gitdir, cwd, nongit_ok);
741 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
742 if (is_bare_repository_cfg > 0) {
743 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
745 die_errno("Could not come back to cwd");
749 /* #0, #1, #5, #8, #9, #12, #13 */
750 set_git_work_tree(".");
751 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
754 inside_work_tree = 1;
755 if (offset == cwd->len)
758 /* Make "offset" point past the '/' (already the case for root dirs) */
759 if (offset != offset_1st_component(cwd->buf))
761 /* Add a '/' at the end */
762 strbuf_addch(cwd, '/');
763 return cwd->buf + offset;
766 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
767 static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
772 if (check_repository_format_gently(".", nongit_ok))
775 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
777 /* --work-tree is set without --git-dir; use discovered one */
778 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
779 static const char *gitdir;
781 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
783 die_errno("Could not come back to cwd");
784 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
788 inside_work_tree = 0;
789 if (offset != cwd->len) {
791 die_errno("Cannot come back to cwd");
792 root_len = offset_1st_component(cwd->buf);
793 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
794 set_git_dir(cwd->buf);
801 static const char *setup_nongit(const char *cwd, int *nongit_ok)
804 die(_("Not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
806 die_errno(_("Cannot come back to cwd"));
811 static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
814 if (stat(path, &buf)) {
815 die_errno("failed to stat '%*s%s%s'",
817 prefix ? prefix : "",
818 prefix ? "/" : "", path);
824 * A "string_list_each_func_t" function that canonicalizes an entry
825 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
826 * discards it if unusable. The presence of an empty entry in
827 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
828 * subsequent entries.
830 static int canonicalize_ceiling_entry(struct string_list_item *item,
833 int *empty_entry_found = cb_data;
834 char *ceil = item->string;
837 *empty_entry_found = 1;
839 } else if (!is_absolute_path(ceil)) {
841 } else if (*empty_entry_found) {
842 /* Keep entry but do not canonicalize it */
845 char *real_path = real_pathdup(ceil, 0);
850 item->string = real_path;
855 enum discovery_result {
860 /* these are errors */
861 GIT_DIR_HIT_CEILING = -1,
862 GIT_DIR_HIT_MOUNT_POINT = -2,
863 GIT_DIR_INVALID_GITFILE = -3
867 * We cannot decide in this function whether we are in the work tree or
868 * not, since the config can only be read _after_ this function was called.
870 * Also, we avoid changing any global state (such as the current working
871 * directory) to allow early callers.
873 * The directory where the search should start needs to be passed in via the
874 * `dir` parameter; upon return, the `dir` buffer will contain the path of
875 * the directory where the search ended, and `gitdir` will contain the path of
876 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it
877 * is relative to `dir` (i.e. *not* necessarily the cwd).
879 static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
880 struct strbuf *gitdir,
883 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
884 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
885 const char *gitdirenv;
886 int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1;
887 dev_t current_device = 0;
888 int one_filesystem = 1;
891 * If GIT_DIR is set explicitly, we're not going
892 * to do any discovery, but we still do repository
895 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
897 strbuf_addstr(gitdir, gitdirenv);
898 return GIT_DIR_EXPLICIT;
901 if (env_ceiling_dirs) {
902 int empty_entry_found = 0;
904 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
905 filter_string_list(&ceiling_dirs, 0,
906 canonicalize_ceiling_entry, &empty_entry_found);
907 ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs);
908 string_list_clear(&ceiling_dirs, 0);
912 ceil_offset = min_offset - 2;
915 * Test in the following order (relative to the dir):
916 * - .git (file containing "gitdir: <path>")
925 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
927 current_device = get_device_or_die(dir->buf, NULL, 0);
929 int offset = dir->len, error_code = 0;
931 if (offset > min_offset)
932 strbuf_addch(dir, '/');
933 strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
934 gitdirenv = read_gitfile_gently(dir->buf, die_on_error ?
938 error_code == READ_GITFILE_ERR_NOT_A_FILE) {
939 /* NEEDSWORK: fail if .git is not file nor dir */
940 if (is_git_directory(dir->buf))
941 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
942 } else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
943 return GIT_DIR_INVALID_GITFILE;
945 strbuf_setlen(dir, offset);
947 strbuf_addstr(gitdir, gitdirenv);
948 return GIT_DIR_DISCOVERED;
951 if (is_git_directory(dir->buf)) {
952 strbuf_addstr(gitdir, ".");
956 if (offset <= min_offset)
957 return GIT_DIR_HIT_CEILING;
959 while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset]))
961 if (offset <= ceil_offset)
962 return GIT_DIR_HIT_CEILING;
964 strbuf_setlen(dir, offset > min_offset ? offset : min_offset);
965 if (one_filesystem &&
966 current_device != get_device_or_die(dir->buf, NULL, offset))
967 return GIT_DIR_HIT_MOUNT_POINT;
971 int discover_git_directory(struct strbuf *commondir,
972 struct strbuf *gitdir)
974 struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
975 size_t gitdir_offset = gitdir->len, cwd_len;
976 size_t commondir_offset = commondir->len;
977 struct repository_format candidate;
979 if (strbuf_getcwd(&dir))
983 if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) {
984 strbuf_release(&dir);
989 * The returned gitdir is relative to dir, and if dir does not reflect
990 * the current working directory, we simply make the gitdir absolute.
992 if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) {
993 /* Avoid a trailing "/." */
994 if (!strcmp(".", gitdir->buf + gitdir_offset))
995 strbuf_setlen(gitdir, gitdir_offset);
997 strbuf_addch(&dir, '/');
998 strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
1001 get_common_dir(commondir, gitdir->buf + gitdir_offset);
1004 strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset);
1005 read_repository_format(&candidate, dir.buf);
1006 strbuf_release(&dir);
1008 if (verify_repository_format(&candidate, &err) < 0) {
1009 warning("ignoring git dir '%s': %s",
1010 gitdir->buf + gitdir_offset, err.buf);
1011 strbuf_release(&err);
1012 strbuf_setlen(commondir, commondir_offset);
1013 strbuf_setlen(gitdir, gitdir_offset);
1020 const char *setup_git_directory_gently(int *nongit_ok)
1022 static struct strbuf cwd = STRBUF_INIT;
1023 struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
1024 const char *prefix, *env_prefix;
1027 * We may have read an incomplete configuration before
1028 * setting-up the git directory. If so, clear the cache so
1029 * that the next queries to the configuration reload complete
1030 * configuration (including the per-repo config file that we
1031 * ignored previously).
1036 * Let's assume that we are in a git repository.
1037 * If it turns out later that we are somewhere else, the value will be
1038 * updated accordingly.
1043 if (strbuf_getcwd(&cwd))
1044 die_errno(_("Unable to read current working directory"));
1045 strbuf_addbuf(&dir, &cwd);
1047 switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) {
1051 case GIT_DIR_EXPLICIT:
1052 prefix = setup_explicit_git_dir(gitdir.buf, &cwd, nongit_ok);
1054 case GIT_DIR_DISCOVERED:
1055 if (dir.len < cwd.len && chdir(dir.buf))
1056 die(_("Cannot change to '%s'"), dir.buf);
1057 prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
1061 if (dir.len < cwd.len && chdir(dir.buf))
1062 die(_("Cannot change to '%s'"), dir.buf);
1063 prefix = setup_bare_git_dir(&cwd, dir.len, nongit_ok);
1065 case GIT_DIR_HIT_CEILING:
1066 prefix = setup_nongit(cwd.buf, nongit_ok);
1068 case GIT_DIR_HIT_MOUNT_POINT:
1071 strbuf_release(&cwd);
1072 strbuf_release(&dir);
1075 die(_("Not a git repository (or any parent up to mount point %s)\n"
1076 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
1079 die("BUG: unhandled setup_git_directory_1() result");
1082 env_prefix = getenv(GIT_TOPLEVEL_PREFIX_ENVIRONMENT);
1084 prefix = env_prefix;
1087 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1089 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1091 startup_info->have_repository = !nongit_ok || !*nongit_ok;
1092 startup_info->prefix = prefix;
1094 strbuf_release(&dir);
1095 strbuf_release(&gitdir);
1100 int git_config_perm(const char *var, const char *value)
1108 if (!strcmp(value, "umask"))
1110 if (!strcmp(value, "group"))
1112 if (!strcmp(value, "all") ||
1113 !strcmp(value, "world") ||
1114 !strcmp(value, "everybody"))
1115 return PERM_EVERYBODY;
1117 /* Parse octal numbers */
1118 i = strtol(value, &endptr, 8);
1120 /* If not an octal number, maybe true/false? */
1122 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
1125 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
1126 * a chmod value to restrict to.
1129 case PERM_UMASK: /* 0 */
1131 case OLD_PERM_GROUP: /* 1 */
1133 case OLD_PERM_EVERYBODY: /* 2 */
1134 return PERM_EVERYBODY;
1137 /* A filemode value was given: 0xxx */
1139 if ((i & 0600) != 0600)
1140 die(_("Problem with core.sharedRepository filemode value "
1141 "(0%.3o).\nThe owner of files must always have "
1142 "read and write permissions."), i);
1145 * Mask filemode value. Others can not get write permission.
1146 * x flags for directories are handled separately.
1151 void check_repository_format(void)
1153 check_repository_format_gently(get_git_dir(), NULL);
1154 startup_info->have_repository = 1;
1158 * Returns the "prefix", a path to the current working directory
1159 * relative to the work tree root, or NULL, if the current working
1160 * directory is not a strict subdirectory of the work tree root. The
1161 * prefix always ends with a '/' character.
1163 const char *setup_git_directory(void)
1165 return setup_git_directory_gently(NULL);
1168 const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
1170 if (is_git_directory(suspect))
1172 return read_gitfile_gently(suspect, return_error_code);
1175 /* if any standard file descriptor is missing open it to /dev/null */
1176 void sanitize_stdfds(void)
1178 int fd = open("/dev/null", O_RDWR, 0);
1179 while (fd != -1 && fd < 2)
1182 die_errno("open /dev/null or dup failed");
1189 #ifdef NO_POSIX_GOODIES
1197 die_errno("fork failed");
1202 die_errno("setsid failed");