setup: add gentle version of read_gitfile
[git/mingw.git] / setup.c
blob4748b6338d8fe338d4e001f9e9587ba349ab05a4
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 (!no_wildcard(arg))
144 return 1;
145 else if (prefix)
146 name = prefix_filename(prefix, strlen(prefix), arg);
147 else
148 name = arg;
149 if (!lstat(name, &st))
150 return 1; /* file exists */
151 if (errno == ENOENT || errno == ENOTDIR)
152 return 0; /* file does not exist */
153 die_errno("failed to stat '%s'", arg);
156 static void NORETURN die_verify_filename(const char *prefix,
157 const char *arg,
158 int diagnose_misspelt_rev)
160 if (!diagnose_misspelt_rev)
161 die("%s: no such path in the working tree.\n"
162 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
163 arg);
165 * Saying "'(icase)foo' does not exist in the index" when the
166 * user gave us ":(icase)foo" is just stupid. A magic pathspec
167 * begins with a colon and is followed by a non-alnum; do not
168 * let maybe_die_on_misspelt_object_name() even trigger.
170 if (!(arg[0] == ':' && !isalnum(arg[1])))
171 maybe_die_on_misspelt_object_name(arg, prefix);
173 /* ... or fall back the most general message. */
174 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
175 "Use '--' to separate paths from revisions, like this:\n"
176 "'git <command> [<revision>...] -- [<file>...]'", arg);
181 * Verify a filename that we got as an argument for a pathspec
182 * entry. Note that a filename that begins with "-" never verifies
183 * as true, because even if such a filename were to exist, we want
184 * it to be preceded by the "--" marker (or we want the user to
185 * use a format like "./-filename")
187 * The "diagnose_misspelt_rev" is used to provide a user-friendly
188 * diagnosis when dying upon finding that "name" is not a pathname.
189 * If set to 1, the diagnosis will try to diagnose "name" as an
190 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
191 * will only complain about an inexisting file.
193 * This function is typically called to check that a "file or rev"
194 * argument is unambiguous. In this case, the caller will want
195 * diagnose_misspelt_rev == 1 when verifying the first non-rev
196 * argument (which could have been a revision), and
197 * diagnose_misspelt_rev == 0 for the next ones (because we already
198 * saw a filename, there's not ambiguity anymore).
200 void verify_filename(const char *prefix,
201 const char *arg,
202 int diagnose_misspelt_rev)
204 if (*arg == '-')
205 die("bad flag '%s' used after filename", arg);
206 if (check_filename(prefix, arg))
207 return;
208 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
212 * Opposite of the above: the command line did not have -- marker
213 * and we parsed the arg as a refname. It should not be interpretable
214 * as a filename.
216 void verify_non_filename(const char *prefix, const char *arg)
218 if (!is_inside_work_tree() || is_inside_git_dir())
219 return;
220 if (*arg == '-')
221 return; /* flag */
222 if (!check_filename(prefix, arg))
223 return;
224 die("ambiguous argument '%s': both revision and filename\n"
225 "Use '--' to separate paths from revisions, like this:\n"
226 "'git <command> [<revision>...] -- [<file>...]'", arg);
229 int get_common_dir(struct strbuf *sb, const char *gitdir)
231 struct strbuf data = STRBUF_INIT;
232 struct strbuf path = STRBUF_INIT;
233 const char *git_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
234 int ret = 0;
235 if (git_common_dir) {
236 strbuf_addstr(sb, git_common_dir);
237 return 1;
239 strbuf_addf(&path, "%s/commondir", gitdir);
240 if (file_exists(path.buf)) {
241 if (strbuf_read_file(&data, path.buf, 0) <= 0)
242 die_errno(_("failed to read %s"), path.buf);
243 while (data.len && (data.buf[data.len - 1] == '\n' ||
244 data.buf[data.len - 1] == '\r'))
245 data.len--;
246 data.buf[data.len] = '\0';
247 strbuf_reset(&path);
248 if (!is_absolute_path(data.buf))
249 strbuf_addf(&path, "%s/", gitdir);
250 strbuf_addbuf(&path, &data);
251 strbuf_addstr(sb, real_path(path.buf));
252 ret = 1;
253 } else
254 strbuf_addstr(sb, gitdir);
255 strbuf_release(&data);
256 strbuf_release(&path);
257 return ret;
261 * Test if it looks like we're at a git directory.
262 * We want to see:
264 * - either an objects/ directory _or_ the proper
265 * GIT_OBJECT_DIRECTORY environment variable
266 * - a refs/ directory
267 * - either a HEAD symlink or a HEAD file that is formatted as
268 * a proper "ref:", or a regular file HEAD that has a properly
269 * formatted sha1 object name.
271 int is_git_directory(const char *suspect)
273 struct strbuf path = STRBUF_INIT;
274 int ret = 0;
275 size_t len;
277 /* Check worktree-related signatures */
278 strbuf_addf(&path, "%s/HEAD", suspect);
279 if (validate_headref(path.buf))
280 goto done;
282 strbuf_reset(&path);
283 get_common_dir(&path, suspect);
284 len = path.len;
286 /* Check non-worktree-related signatures */
287 if (getenv(DB_ENVIRONMENT)) {
288 if (access(getenv(DB_ENVIRONMENT), X_OK))
289 goto done;
291 else {
292 strbuf_setlen(&path, len);
293 strbuf_addstr(&path, "/objects");
294 if (access(path.buf, X_OK))
295 goto done;
298 strbuf_setlen(&path, len);
299 strbuf_addstr(&path, "/refs");
300 if (access(path.buf, X_OK))
301 goto done;
303 ret = 1;
304 done:
305 strbuf_release(&path);
306 return ret;
309 int is_inside_git_dir(void)
311 if (inside_git_dir < 0)
312 inside_git_dir = is_inside_dir(get_git_dir());
313 return inside_git_dir;
316 int is_inside_work_tree(void)
318 if (inside_work_tree < 0)
319 inside_work_tree = is_inside_dir(get_git_work_tree());
320 return inside_work_tree;
323 void setup_work_tree(void)
325 const char *work_tree, *git_dir;
326 static int initialized = 0;
328 if (initialized)
329 return;
330 work_tree = get_git_work_tree();
331 git_dir = get_git_dir();
332 if (!is_absolute_path(git_dir))
333 git_dir = real_path(get_git_dir());
334 if (!work_tree || chdir(work_tree))
335 die("This operation must be run in a work tree");
338 * Make sure subsequent git processes find correct worktree
339 * if $GIT_WORK_TREE is set relative
341 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
342 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
344 set_git_dir(remove_leading_path(git_dir, work_tree));
345 initialized = 1;
348 static int check_repo_format(const char *var, const char *value, void *cb)
350 if (strcmp(var, "core.repositoryformatversion") == 0)
351 repository_format_version = git_config_int(var, value);
352 else if (strcmp(var, "core.sharedrepository") == 0)
353 shared_repository = git_config_perm(var, value);
354 return 0;
357 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
359 struct strbuf sb = STRBUF_INIT;
360 const char *repo_config;
361 config_fn_t fn;
362 int ret = 0;
364 if (get_common_dir(&sb, gitdir))
365 fn = check_repo_format;
366 else
367 fn = check_repository_format_version;
368 strbuf_addstr(&sb, "/config");
369 repo_config = sb.buf;
372 * git_config() can't be used here because it calls git_pathdup()
373 * to get $GIT_CONFIG/config. That call will make setup_git_env()
374 * set git_dir to ".git".
376 * We are in gitdir setup, no git dir has been found useable yet.
377 * Use a gentler version of git_config() to check if this repo
378 * is a good one.
380 git_config_early(fn, NULL, repo_config);
381 if (GIT_REPO_VERSION < repository_format_version) {
382 if (!nongit_ok)
383 die ("Expected git repo version <= %d, found %d",
384 GIT_REPO_VERSION, repository_format_version);
385 warning("Expected git repo version <= %d, found %d",
386 GIT_REPO_VERSION, repository_format_version);
387 warning("Please upgrade Git");
388 *nongit_ok = -1;
389 ret = -1;
391 strbuf_release(&sb);
392 return ret;
395 static void update_linked_gitdir(const char *gitfile, const char *gitdir)
397 struct strbuf path = STRBUF_INIT;
398 struct stat st;
400 strbuf_addf(&path, "%s/gitfile", gitdir);
401 if (stat(path.buf, &st) || st.st_mtime + 24 * 3600 < time(NULL))
402 write_file(path.buf, 0, "%s\n", gitfile);
403 strbuf_release(&path);
407 * Try to read the location of the git directory from the .git file,
408 * return path to git directory if found.
410 * On failure, if return_error_code is not NULL, return_error_code
411 * will be set to an error code and NULL will be returned. If
412 * return_error_code is NULL the function will die instead (for most
413 * cases).
415 const char *read_gitfile_gently(const char *path, int *return_error_code)
417 int error_code = 0;
418 char *buf = NULL;
419 char *dir = NULL;
420 const char *slash;
421 struct stat st;
422 int fd;
423 ssize_t len;
425 if (stat(path, &st)) {
426 error_code = READ_GITFILE_ERR_STAT_FAILED;
427 goto cleanup_return;
429 if (!S_ISREG(st.st_mode)) {
430 error_code = READ_GITFILE_ERR_NOT_A_FILE;
431 goto cleanup_return;
433 fd = open(path, O_RDONLY);
434 if (fd < 0) {
435 error_code = READ_GITFILE_ERR_OPEN_FAILED;
436 goto cleanup_return;
438 buf = xmalloc(st.st_size + 1);
439 len = read_in_full(fd, buf, st.st_size);
440 close(fd);
441 if (len != st.st_size) {
442 error_code = READ_GITFILE_ERR_READ_FAILED;
443 goto cleanup_return;
445 buf[len] = '\0';
446 if (!starts_with(buf, "gitdir: ")) {
447 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
448 goto cleanup_return;
450 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
451 len--;
452 if (len < 9) {
453 error_code = READ_GITFILE_ERR_NO_PATH;
454 goto cleanup_return;
456 buf[len] = '\0';
457 dir = buf + 8;
459 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
460 size_t pathlen = slash+1 - path;
461 size_t dirlen = pathlen + len - 8;
462 dir = xmalloc(dirlen + 1);
463 strncpy(dir, path, pathlen);
464 strncpy(dir + pathlen, buf + 8, len - 8);
465 dir[dirlen] = '\0';
466 free(buf);
467 buf = dir;
469 if (!is_git_directory(dir)) {
470 error_code = READ_GITFILE_ERR_NOT_A_REPO;
471 goto cleanup_return;
473 update_linked_gitdir(path, dir);
474 path = real_path(dir);
476 cleanup_return:
477 free(buf);
479 if (return_error_code)
480 *return_error_code = error_code;
482 if (error_code) {
483 if (return_error_code)
484 return NULL;
486 switch (error_code) {
487 case READ_GITFILE_ERR_STAT_FAILED:
488 case READ_GITFILE_ERR_NOT_A_FILE:
489 return NULL;
490 case READ_GITFILE_ERR_OPEN_FAILED:
491 die_errno("Error opening '%s'", path);
492 case READ_GITFILE_ERR_READ_FAILED:
493 die("Error reading %s", path);
494 case READ_GITFILE_ERR_INVALID_FORMAT:
495 die("Invalid gitfile format: %s", path);
496 case READ_GITFILE_ERR_NO_PATH:
497 die("No path in gitfile: %s", path);
498 case READ_GITFILE_ERR_NOT_A_REPO:
499 die("Not a git repository: %s", dir);
500 default:
501 assert(0);
505 return path;
508 static const char *setup_explicit_git_dir(const char *gitdirenv,
509 struct strbuf *cwd,
510 int *nongit_ok)
512 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
513 const char *worktree;
514 char *gitfile;
515 int offset;
517 if (PATH_MAX - 40 < strlen(gitdirenv))
518 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
520 gitfile = (char*)read_gitfile(gitdirenv);
521 if (gitfile) {
522 gitfile = xstrdup(gitfile);
523 gitdirenv = gitfile;
526 if (!is_git_directory(gitdirenv)) {
527 if (nongit_ok) {
528 *nongit_ok = 1;
529 free(gitfile);
530 return NULL;
532 die("Not a git repository: '%s'", gitdirenv);
535 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
536 free(gitfile);
537 return NULL;
540 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
541 if (work_tree_env)
542 set_git_work_tree(work_tree_env);
543 else if (is_bare_repository_cfg > 0) {
544 if (git_work_tree_cfg) /* #22.2, #30 */
545 die("core.bare and core.worktree do not make sense");
547 /* #18, #26 */
548 set_git_dir(gitdirenv);
549 free(gitfile);
550 return NULL;
552 else if (git_work_tree_cfg) { /* #6, #14 */
553 if (is_absolute_path(git_work_tree_cfg))
554 set_git_work_tree(git_work_tree_cfg);
555 else {
556 char *core_worktree;
557 if (chdir(gitdirenv))
558 die_errno("Could not chdir to '%s'", gitdirenv);
559 if (chdir(git_work_tree_cfg))
560 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
561 core_worktree = xgetcwd();
562 if (chdir(cwd->buf))
563 die_errno("Could not come back to cwd");
564 set_git_work_tree(core_worktree);
565 free(core_worktree);
568 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
569 /* #16d */
570 set_git_dir(gitdirenv);
571 free(gitfile);
572 return NULL;
574 else /* #2, #10 */
575 set_git_work_tree(".");
577 /* set_git_work_tree() must have been called by now */
578 worktree = get_git_work_tree();
580 /* both get_git_work_tree() and cwd are already normalized */
581 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
582 set_git_dir(gitdirenv);
583 free(gitfile);
584 return NULL;
587 offset = dir_inside_of(cwd->buf, worktree);
588 if (offset >= 0) { /* cwd inside worktree? */
589 set_git_dir(real_path(gitdirenv));
590 if (chdir(worktree))
591 die_errno("Could not chdir to '%s'", worktree);
592 strbuf_addch(cwd, '/');
593 free(gitfile);
594 return cwd->buf + offset;
597 /* cwd outside worktree */
598 set_git_dir(gitdirenv);
599 free(gitfile);
600 return NULL;
603 static const char *setup_discovered_git_dir(const char *gitdir,
604 struct strbuf *cwd, int offset,
605 int *nongit_ok)
607 if (check_repository_format_gently(gitdir, nongit_ok))
608 return NULL;
610 /* --work-tree is set without --git-dir; use discovered one */
611 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
612 if (offset != cwd->len && !is_absolute_path(gitdir))
613 gitdir = xstrdup(real_path(gitdir));
614 if (chdir(cwd->buf))
615 die_errno("Could not come back to cwd");
616 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
619 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
620 if (is_bare_repository_cfg > 0) {
621 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
622 if (chdir(cwd->buf))
623 die_errno("Could not come back to cwd");
624 return NULL;
627 /* #0, #1, #5, #8, #9, #12, #13 */
628 set_git_work_tree(".");
629 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
630 set_git_dir(gitdir);
631 inside_git_dir = 0;
632 inside_work_tree = 1;
633 if (offset == cwd->len)
634 return NULL;
636 /* Make "offset" point to past the '/', and add a '/' at the end */
637 offset++;
638 strbuf_addch(cwd, '/');
639 return cwd->buf + offset;
642 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
643 static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
644 int *nongit_ok)
646 int root_len;
648 if (check_repository_format_gently(".", nongit_ok))
649 return NULL;
651 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
653 /* --work-tree is set without --git-dir; use discovered one */
654 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
655 const char *gitdir;
657 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
658 if (chdir(cwd->buf))
659 die_errno("Could not come back to cwd");
660 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
663 inside_git_dir = 1;
664 inside_work_tree = 0;
665 if (offset != cwd->len) {
666 if (chdir(cwd->buf))
667 die_errno("Cannot come back to cwd");
668 root_len = offset_1st_component(cwd->buf);
669 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
670 set_git_dir(cwd->buf);
672 else
673 set_git_dir(".");
674 return NULL;
677 static const char *setup_nongit(const char *cwd, int *nongit_ok)
679 if (!nongit_ok)
680 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
681 if (chdir(cwd))
682 die_errno("Cannot come back to cwd");
683 *nongit_ok = 1;
684 return NULL;
687 static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
689 struct stat buf;
690 if (stat(path, &buf)) {
691 die_errno("failed to stat '%*s%s%s'",
692 prefix_len,
693 prefix ? prefix : "",
694 prefix ? "/" : "", path);
696 return buf.st_dev;
700 * A "string_list_each_func_t" function that canonicalizes an entry
701 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
702 * discards it if unusable. The presence of an empty entry in
703 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
704 * subsequent entries.
706 static int canonicalize_ceiling_entry(struct string_list_item *item,
707 void *cb_data)
709 int *empty_entry_found = cb_data;
710 char *ceil = item->string;
712 if (!*ceil) {
713 *empty_entry_found = 1;
714 return 0;
715 } else if (!is_absolute_path(ceil)) {
716 return 0;
717 } else if (*empty_entry_found) {
718 /* Keep entry but do not canonicalize it */
719 return 1;
720 } else {
721 const char *real_path = real_path_if_valid(ceil);
722 if (!real_path)
723 return 0;
724 free(item->string);
725 item->string = xstrdup(real_path);
726 return 1;
731 * We cannot decide in this function whether we are in the work tree or
732 * not, since the config can only be read _after_ this function was called.
734 static const char *setup_git_directory_gently_1(int *nongit_ok)
736 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
737 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
738 static struct strbuf cwd = STRBUF_INIT;
739 const char *gitdirenv, *ret;
740 char *gitfile;
741 int offset, offset_parent, ceil_offset = -1;
742 dev_t current_device = 0;
743 int one_filesystem = 1;
746 * We may have read an incomplete configuration before
747 * setting-up the git directory. If so, clear the cache so
748 * that the next queries to the configuration reload complete
749 * configuration (including the per-repo config file that we
750 * ignored previously).
752 git_config_clear();
755 * Let's assume that we are in a git repository.
756 * If it turns out later that we are somewhere else, the value will be
757 * updated accordingly.
759 if (nongit_ok)
760 *nongit_ok = 0;
762 if (strbuf_getcwd(&cwd))
763 die_errno("Unable to read current working directory");
764 offset = cwd.len;
767 * If GIT_DIR is set explicitly, we're not going
768 * to do any discovery, but we still do repository
769 * validation.
771 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
772 if (gitdirenv)
773 return setup_explicit_git_dir(gitdirenv, &cwd, nongit_ok);
775 if (env_ceiling_dirs) {
776 int empty_entry_found = 0;
778 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
779 filter_string_list(&ceiling_dirs, 0,
780 canonicalize_ceiling_entry, &empty_entry_found);
781 ceil_offset = longest_ancestor_length(cwd.buf, &ceiling_dirs);
782 string_list_clear(&ceiling_dirs, 0);
785 if (ceil_offset < 0 && has_dos_drive_prefix(cwd.buf))
786 ceil_offset = 1;
789 * Test in the following order (relative to the cwd):
790 * - .git (file containing "gitdir: <path>")
791 * - .git/
792 * - ./ (bare)
793 * - ../.git
794 * - ../.git/
795 * - ../ (bare)
796 * - ../../.git/
797 * etc.
799 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
800 if (one_filesystem)
801 current_device = get_device_or_die(".", NULL, 0);
802 for (;;) {
803 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
804 if (gitfile)
805 gitdirenv = gitfile = xstrdup(gitfile);
806 else {
807 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
808 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
811 if (gitdirenv) {
812 ret = setup_discovered_git_dir(gitdirenv,
813 &cwd, offset,
814 nongit_ok);
815 free(gitfile);
816 return ret;
818 free(gitfile);
820 if (is_git_directory("."))
821 return setup_bare_git_dir(&cwd, offset, nongit_ok);
823 offset_parent = offset;
824 while (--offset_parent > ceil_offset && cwd.buf[offset_parent] != '/');
825 if (offset_parent <= ceil_offset)
826 return setup_nongit(cwd.buf, nongit_ok);
827 if (one_filesystem) {
828 dev_t parent_device = get_device_or_die("..", cwd.buf,
829 offset);
830 if (parent_device != current_device) {
831 if (nongit_ok) {
832 if (chdir(cwd.buf))
833 die_errno("Cannot come back to cwd");
834 *nongit_ok = 1;
835 return NULL;
837 strbuf_setlen(&cwd, offset);
838 die("Not a git repository (or any parent up to mount point %s)\n"
839 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).",
840 cwd.buf);
843 if (chdir("..")) {
844 strbuf_setlen(&cwd, offset);
845 die_errno("Cannot change to '%s/..'", cwd.buf);
847 offset = offset_parent;
851 const char *setup_git_directory_gently(int *nongit_ok)
853 const char *prefix;
855 prefix = setup_git_directory_gently_1(nongit_ok);
856 if (prefix)
857 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
858 else
859 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
861 if (startup_info) {
862 startup_info->have_repository = !nongit_ok || !*nongit_ok;
863 startup_info->prefix = prefix;
865 return prefix;
868 int git_config_perm(const char *var, const char *value)
870 int i;
871 char *endptr;
873 if (value == NULL)
874 return PERM_GROUP;
876 if (!strcmp(value, "umask"))
877 return PERM_UMASK;
878 if (!strcmp(value, "group"))
879 return PERM_GROUP;
880 if (!strcmp(value, "all") ||
881 !strcmp(value, "world") ||
882 !strcmp(value, "everybody"))
883 return PERM_EVERYBODY;
885 /* Parse octal numbers */
886 i = strtol(value, &endptr, 8);
888 /* If not an octal number, maybe true/false? */
889 if (*endptr != 0)
890 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
893 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
894 * a chmod value to restrict to.
896 switch (i) {
897 case PERM_UMASK: /* 0 */
898 return PERM_UMASK;
899 case OLD_PERM_GROUP: /* 1 */
900 return PERM_GROUP;
901 case OLD_PERM_EVERYBODY: /* 2 */
902 return PERM_EVERYBODY;
905 /* A filemode value was given: 0xxx */
907 if ((i & 0600) != 0600)
908 die("Problem with core.sharedRepository filemode value "
909 "(0%.3o).\nThe owner of files must always have "
910 "read and write permissions.", i);
913 * Mask filemode value. Others can not get write permission.
914 * x flags for directories are handled separately.
916 return -(i & 0666);
919 int check_repository_format_version(const char *var, const char *value, void *cb)
921 int ret = check_repo_format(var, value, cb);
922 if (ret)
923 return ret;
924 if (strcmp(var, "core.bare") == 0) {
925 is_bare_repository_cfg = git_config_bool(var, value);
926 if (is_bare_repository_cfg == 1)
927 inside_work_tree = -1;
928 } else if (strcmp(var, "core.worktree") == 0) {
929 if (!value)
930 return config_error_nonbool(var);
931 free(git_work_tree_cfg);
932 git_work_tree_cfg = xstrdup(value);
933 inside_work_tree = -1;
935 return 0;
938 int check_repository_format(void)
940 return check_repository_format_gently(get_git_dir(), NULL);
944 * Returns the "prefix", a path to the current working directory
945 * relative to the work tree root, or NULL, if the current working
946 * directory is not a strict subdirectory of the work tree root. The
947 * prefix always ends with a '/' character.
949 const char *setup_git_directory(void)
951 return setup_git_directory_gently(NULL);
954 const char *resolve_gitdir(const char *suspect)
956 if (is_git_directory(suspect))
957 return suspect;
958 return read_gitfile(suspect);
961 /* if any standard file descriptor is missing open it to /dev/null */
962 void sanitize_stdfds(void)
964 int fd = open("/dev/null", O_RDWR, 0);
965 while (fd != -1 && fd < 2)
966 fd = dup(fd);
967 if (fd == -1)
968 die_errno("open /dev/null or dup failed");
969 if (fd > 2)
970 close(fd);
973 int daemonize(void)
975 #ifdef NO_POSIX_GOODIES
976 errno = ENOSYS;
977 return -1;
978 #else
979 switch (fork()) {
980 case 0:
981 break;
982 case -1:
983 die_errno("fork failed");
984 default:
985 exit(0);
987 if (setsid() == -1)
988 die_errno("setsid failed");
989 close(0);
990 close(1);
991 close(2);
992 sanitize_stdfds();
993 return 0;
994 #endif