checkout: fix bug with --to and relative HEAD
[git/mingw.git] / setup.c
blobfb6186049d1d9af1e84b2468c069b346c5a24a3b
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);
227 int get_common_dir(struct strbuf *sb, const char *gitdir)
229 struct strbuf data = STRBUF_INIT;
230 struct strbuf path = STRBUF_INIT;
231 const char *git_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
232 int ret = 0;
233 if (git_common_dir) {
234 strbuf_addstr(sb, git_common_dir);
235 return 1;
237 strbuf_addf(&path, "%s/commondir", gitdir);
238 if (file_exists(path.buf)) {
239 if (strbuf_read_file(&data, path.buf, 0) <= 0)
240 die_errno(_("failed to read %s"), path.buf);
241 while (data.len && (data.buf[data.len - 1] == '\n' ||
242 data.buf[data.len - 1] == '\r'))
243 data.len--;
244 data.buf[data.len] = '\0';
245 strbuf_reset(&path);
246 if (!is_absolute_path(data.buf))
247 strbuf_addf(&path, "%s/", gitdir);
248 strbuf_addbuf(&path, &data);
249 strbuf_addstr(sb, real_path(path.buf));
250 ret = 1;
251 } else
252 strbuf_addstr(sb, gitdir);
253 strbuf_release(&data);
254 strbuf_release(&path);
255 return ret;
259 * Test if it looks like we're at a git directory.
260 * We want to see:
262 * - either an objects/ directory _or_ the proper
263 * GIT_OBJECT_DIRECTORY environment variable
264 * - a refs/ directory
265 * - either a HEAD symlink or a HEAD file that is formatted as
266 * a proper "ref:", or a regular file HEAD that has a properly
267 * formatted sha1 object name.
269 int is_git_directory(const char *suspect)
271 struct strbuf path = STRBUF_INIT;
272 int ret = 0;
273 size_t len;
275 /* Check worktree-related signatures */
276 strbuf_addf(&path, "%s/HEAD", suspect);
277 if (validate_headref(path.buf))
278 goto done;
280 strbuf_reset(&path);
281 get_common_dir(&path, suspect);
282 len = path.len;
284 /* Check non-worktree-related signatures */
285 if (getenv(DB_ENVIRONMENT)) {
286 if (access(getenv(DB_ENVIRONMENT), X_OK))
287 goto done;
289 else {
290 strbuf_setlen(&path, len);
291 strbuf_addstr(&path, "/objects");
292 if (access(path.buf, X_OK))
293 goto done;
296 strbuf_setlen(&path, len);
297 strbuf_addstr(&path, "/refs");
298 if (access(path.buf, X_OK))
299 goto done;
301 ret = 1;
302 done:
303 strbuf_release(&path);
304 return ret;
307 int is_inside_git_dir(void)
309 if (inside_git_dir < 0)
310 inside_git_dir = is_inside_dir(get_git_dir());
311 return inside_git_dir;
314 int is_inside_work_tree(void)
316 if (inside_work_tree < 0)
317 inside_work_tree = is_inside_dir(get_git_work_tree());
318 return inside_work_tree;
321 void setup_work_tree(void)
323 const char *work_tree, *git_dir;
324 static int initialized = 0;
326 if (initialized)
327 return;
328 work_tree = get_git_work_tree();
329 git_dir = get_git_dir();
330 if (!is_absolute_path(git_dir))
331 git_dir = real_path(get_git_dir());
332 if (!work_tree || chdir(work_tree))
333 die("This operation must be run in a work tree");
336 * Make sure subsequent git processes find correct worktree
337 * if $GIT_WORK_TREE is set relative
339 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
340 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
342 set_git_dir(remove_leading_path(git_dir, work_tree));
343 initialized = 1;
346 static int check_repo_format(const char *var, const char *value, void *cb)
348 if (strcmp(var, "core.repositoryformatversion") == 0)
349 repository_format_version = git_config_int(var, value);
350 else if (strcmp(var, "core.sharedrepository") == 0)
351 shared_repository = git_config_perm(var, value);
352 return 0;
355 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
357 struct strbuf sb = STRBUF_INIT;
358 const char *repo_config;
359 config_fn_t fn;
360 int ret = 0;
362 if (get_common_dir(&sb, gitdir))
363 fn = check_repo_format;
364 else
365 fn = check_repository_format_version;
366 strbuf_addstr(&sb, "/config");
367 repo_config = sb.buf;
370 * git_config() can't be used here because it calls git_pathdup()
371 * to get $GIT_CONFIG/config. That call will make setup_git_env()
372 * set git_dir to ".git".
374 * We are in gitdir setup, no git dir has been found useable yet.
375 * Use a gentler version of git_config() to check if this repo
376 * is a good one.
378 git_config_early(fn, NULL, repo_config);
379 if (GIT_REPO_VERSION < repository_format_version) {
380 if (!nongit_ok)
381 die ("Expected git repo version <= %d, found %d",
382 GIT_REPO_VERSION, repository_format_version);
383 warning("Expected git repo version <= %d, found %d",
384 GIT_REPO_VERSION, repository_format_version);
385 warning("Please upgrade Git");
386 *nongit_ok = -1;
387 ret = -1;
389 strbuf_release(&sb);
390 return ret;
393 static void update_linked_gitdir(const char *gitfile, const char *gitdir)
395 struct strbuf path = STRBUF_INIT;
396 struct stat st;
398 strbuf_addf(&path, "%s/gitfile", gitdir);
399 if (stat(path.buf, &st) || st.st_mtime + 24 * 3600 < time(NULL))
400 write_file(path.buf, 0, "%s\n", gitfile);
401 strbuf_release(&path);
405 * Try to read the location of the git directory from the .git file,
406 * return path to git directory if found.
408 const char *read_gitfile(const char *path)
410 char *buf;
411 char *dir;
412 const char *slash;
413 struct stat st;
414 int fd;
415 ssize_t len;
417 if (stat(path, &st))
418 return NULL;
419 if (!S_ISREG(st.st_mode))
420 return NULL;
421 fd = open(path, O_RDONLY);
422 if (fd < 0)
423 die_errno("Error opening '%s'", path);
424 buf = xmalloc(st.st_size + 1);
425 len = read_in_full(fd, buf, st.st_size);
426 close(fd);
427 if (len != st.st_size)
428 die("Error reading %s", path);
429 buf[len] = '\0';
430 if (!starts_with(buf, "gitdir: "))
431 die("Invalid gitfile format: %s", path);
432 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
433 len--;
434 if (len < 9)
435 die("No path in gitfile: %s", path);
436 buf[len] = '\0';
437 dir = buf + 8;
439 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
440 size_t pathlen = slash+1 - path;
441 size_t dirlen = pathlen + len - 8;
442 dir = xmalloc(dirlen + 1);
443 strncpy(dir, path, pathlen);
444 strncpy(dir + pathlen, buf + 8, len - 8);
445 dir[dirlen] = '\0';
446 free(buf);
447 buf = dir;
450 if (!is_git_directory(dir))
451 die("Not a git repository: %s", dir);
453 update_linked_gitdir(path, dir);
454 path = real_path(dir);
456 free(buf);
457 return path;
460 static const char *setup_explicit_git_dir(const char *gitdirenv,
461 struct strbuf *cwd,
462 int *nongit_ok)
464 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
465 const char *worktree;
466 char *gitfile;
467 int offset;
469 if (PATH_MAX - 40 < strlen(gitdirenv))
470 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
472 gitfile = (char*)read_gitfile(gitdirenv);
473 if (gitfile) {
474 gitfile = xstrdup(gitfile);
475 gitdirenv = gitfile;
478 if (!is_git_directory(gitdirenv)) {
479 if (nongit_ok) {
480 *nongit_ok = 1;
481 free(gitfile);
482 return NULL;
484 die("Not a git repository: '%s'", gitdirenv);
487 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
488 free(gitfile);
489 return NULL;
492 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
493 if (work_tree_env)
494 set_git_work_tree(work_tree_env);
495 else if (is_bare_repository_cfg > 0) {
496 if (git_work_tree_cfg) /* #22.2, #30 */
497 die("core.bare and core.worktree do not make sense");
499 /* #18, #26 */
500 set_git_dir(gitdirenv);
501 free(gitfile);
502 return NULL;
504 else if (git_work_tree_cfg) { /* #6, #14 */
505 if (is_absolute_path(git_work_tree_cfg))
506 set_git_work_tree(git_work_tree_cfg);
507 else {
508 char *core_worktree;
509 if (chdir(gitdirenv))
510 die_errno("Could not chdir to '%s'", gitdirenv);
511 if (chdir(git_work_tree_cfg))
512 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
513 core_worktree = xgetcwd();
514 if (chdir(cwd->buf))
515 die_errno("Could not come back to cwd");
516 set_git_work_tree(core_worktree);
517 free(core_worktree);
520 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
521 /* #16d */
522 set_git_dir(gitdirenv);
523 free(gitfile);
524 return NULL;
526 else /* #2, #10 */
527 set_git_work_tree(".");
529 /* set_git_work_tree() must have been called by now */
530 worktree = get_git_work_tree();
532 /* both get_git_work_tree() and cwd are already normalized */
533 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
534 set_git_dir(gitdirenv);
535 free(gitfile);
536 return NULL;
539 offset = dir_inside_of(cwd->buf, worktree);
540 if (offset >= 0) { /* cwd inside worktree? */
541 set_git_dir(real_path(gitdirenv));
542 if (chdir(worktree))
543 die_errno("Could not chdir to '%s'", worktree);
544 strbuf_addch(cwd, '/');
545 free(gitfile);
546 return cwd->buf + offset;
549 /* cwd outside worktree */
550 set_git_dir(gitdirenv);
551 free(gitfile);
552 return NULL;
555 static const char *setup_discovered_git_dir(const char *gitdir,
556 struct strbuf *cwd, int offset,
557 int *nongit_ok)
559 if (check_repository_format_gently(gitdir, nongit_ok))
560 return NULL;
562 /* --work-tree is set without --git-dir; use discovered one */
563 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
564 if (offset != cwd->len && !is_absolute_path(gitdir))
565 gitdir = xstrdup(real_path(gitdir));
566 if (chdir(cwd->buf))
567 die_errno("Could not come back to cwd");
568 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
571 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
572 if (is_bare_repository_cfg > 0) {
573 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
574 if (chdir(cwd->buf))
575 die_errno("Could not come back to cwd");
576 return NULL;
579 /* #0, #1, #5, #8, #9, #12, #13 */
580 set_git_work_tree(".");
581 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
582 set_git_dir(gitdir);
583 inside_git_dir = 0;
584 inside_work_tree = 1;
585 if (offset == cwd->len)
586 return NULL;
588 /* Make "offset" point to past the '/', and add a '/' at the end */
589 offset++;
590 strbuf_addch(cwd, '/');
591 return cwd->buf + offset;
594 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
595 static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
596 int *nongit_ok)
598 int root_len;
600 if (check_repository_format_gently(".", nongit_ok))
601 return NULL;
603 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
605 /* --work-tree is set without --git-dir; use discovered one */
606 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
607 const char *gitdir;
609 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
610 if (chdir(cwd->buf))
611 die_errno("Could not come back to cwd");
612 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
615 inside_git_dir = 1;
616 inside_work_tree = 0;
617 if (offset != cwd->len) {
618 if (chdir(cwd->buf))
619 die_errno("Cannot come back to cwd");
620 root_len = offset_1st_component(cwd->buf);
621 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
622 set_git_dir(cwd->buf);
624 else
625 set_git_dir(".");
626 return NULL;
629 static const char *setup_nongit(const char *cwd, int *nongit_ok)
631 if (!nongit_ok)
632 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
633 if (chdir(cwd))
634 die_errno("Cannot come back to cwd");
635 *nongit_ok = 1;
636 return NULL;
639 static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
641 struct stat buf;
642 if (stat(path, &buf)) {
643 die_errno("failed to stat '%*s%s%s'",
644 prefix_len,
645 prefix ? prefix : "",
646 prefix ? "/" : "", path);
648 return buf.st_dev;
652 * A "string_list_each_func_t" function that canonicalizes an entry
653 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
654 * discards it if unusable. The presence of an empty entry in
655 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
656 * subsequent entries.
658 static int canonicalize_ceiling_entry(struct string_list_item *item,
659 void *cb_data)
661 int *empty_entry_found = cb_data;
662 char *ceil = item->string;
664 if (!*ceil) {
665 *empty_entry_found = 1;
666 return 0;
667 } else if (!is_absolute_path(ceil)) {
668 return 0;
669 } else if (*empty_entry_found) {
670 /* Keep entry but do not canonicalize it */
671 return 1;
672 } else {
673 const char *real_path = real_path_if_valid(ceil);
674 if (!real_path)
675 return 0;
676 free(item->string);
677 item->string = xstrdup(real_path);
678 return 1;
683 * We cannot decide in this function whether we are in the work tree or
684 * not, since the config can only be read _after_ this function was called.
686 static const char *setup_git_directory_gently_1(int *nongit_ok)
688 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
689 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
690 static struct strbuf cwd = STRBUF_INIT;
691 const char *gitdirenv, *ret;
692 char *gitfile;
693 int offset, offset_parent, ceil_offset = -1;
694 dev_t current_device = 0;
695 int one_filesystem = 1;
698 * We may have read an incomplete configuration before
699 * setting-up the git directory. If so, clear the cache so
700 * that the next queries to the configuration reload complete
701 * configuration (including the per-repo config file that we
702 * ignored previously).
704 git_config_clear();
707 * Let's assume that we are in a git repository.
708 * If it turns out later that we are somewhere else, the value will be
709 * updated accordingly.
711 if (nongit_ok)
712 *nongit_ok = 0;
714 if (strbuf_getcwd(&cwd))
715 die_errno("Unable to read current working directory");
716 offset = cwd.len;
719 * If GIT_DIR is set explicitly, we're not going
720 * to do any discovery, but we still do repository
721 * validation.
723 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
724 if (gitdirenv)
725 return setup_explicit_git_dir(gitdirenv, &cwd, nongit_ok);
727 if (env_ceiling_dirs) {
728 int empty_entry_found = 0;
730 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
731 filter_string_list(&ceiling_dirs, 0,
732 canonicalize_ceiling_entry, &empty_entry_found);
733 ceil_offset = longest_ancestor_length(cwd.buf, &ceiling_dirs);
734 string_list_clear(&ceiling_dirs, 0);
737 if (ceil_offset < 0 && has_dos_drive_prefix(cwd.buf))
738 ceil_offset = 1;
741 * Test in the following order (relative to the cwd):
742 * - .git (file containing "gitdir: <path>")
743 * - .git/
744 * - ./ (bare)
745 * - ../.git
746 * - ../.git/
747 * - ../ (bare)
748 * - ../../.git/
749 * etc.
751 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
752 if (one_filesystem)
753 current_device = get_device_or_die(".", NULL, 0);
754 for (;;) {
755 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
756 if (gitfile)
757 gitdirenv = gitfile = xstrdup(gitfile);
758 else {
759 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
760 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
763 if (gitdirenv) {
764 ret = setup_discovered_git_dir(gitdirenv,
765 &cwd, offset,
766 nongit_ok);
767 free(gitfile);
768 return ret;
770 free(gitfile);
772 if (is_git_directory("."))
773 return setup_bare_git_dir(&cwd, offset, nongit_ok);
775 offset_parent = offset;
776 while (--offset_parent > ceil_offset && cwd.buf[offset_parent] != '/');
777 if (offset_parent <= ceil_offset)
778 return setup_nongit(cwd.buf, nongit_ok);
779 if (one_filesystem) {
780 dev_t parent_device = get_device_or_die("..", cwd.buf,
781 offset);
782 if (parent_device != current_device) {
783 if (nongit_ok) {
784 if (chdir(cwd.buf))
785 die_errno("Cannot come back to cwd");
786 *nongit_ok = 1;
787 return NULL;
789 strbuf_setlen(&cwd, offset);
790 die("Not a git repository (or any parent up to mount point %s)\n"
791 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).",
792 cwd.buf);
795 if (chdir("..")) {
796 strbuf_setlen(&cwd, offset);
797 die_errno("Cannot change to '%s/..'", cwd.buf);
799 offset = offset_parent;
803 const char *setup_git_directory_gently(int *nongit_ok)
805 const char *prefix;
807 prefix = setup_git_directory_gently_1(nongit_ok);
808 if (prefix)
809 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
810 else
811 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
813 if (startup_info) {
814 startup_info->have_repository = !nongit_ok || !*nongit_ok;
815 startup_info->prefix = prefix;
817 return prefix;
820 int git_config_perm(const char *var, const char *value)
822 int i;
823 char *endptr;
825 if (value == NULL)
826 return PERM_GROUP;
828 if (!strcmp(value, "umask"))
829 return PERM_UMASK;
830 if (!strcmp(value, "group"))
831 return PERM_GROUP;
832 if (!strcmp(value, "all") ||
833 !strcmp(value, "world") ||
834 !strcmp(value, "everybody"))
835 return PERM_EVERYBODY;
837 /* Parse octal numbers */
838 i = strtol(value, &endptr, 8);
840 /* If not an octal number, maybe true/false? */
841 if (*endptr != 0)
842 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
845 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
846 * a chmod value to restrict to.
848 switch (i) {
849 case PERM_UMASK: /* 0 */
850 return PERM_UMASK;
851 case OLD_PERM_GROUP: /* 1 */
852 return PERM_GROUP;
853 case OLD_PERM_EVERYBODY: /* 2 */
854 return PERM_EVERYBODY;
857 /* A filemode value was given: 0xxx */
859 if ((i & 0600) != 0600)
860 die("Problem with core.sharedRepository filemode value "
861 "(0%.3o).\nThe owner of files must always have "
862 "read and write permissions.", i);
865 * Mask filemode value. Others can not get write permission.
866 * x flags for directories are handled separately.
868 return -(i & 0666);
871 int check_repository_format_version(const char *var, const char *value, void *cb)
873 int ret = check_repo_format(var, value, cb);
874 if (ret)
875 return ret;
876 if (strcmp(var, "core.bare") == 0) {
877 is_bare_repository_cfg = git_config_bool(var, value);
878 if (is_bare_repository_cfg == 1)
879 inside_work_tree = -1;
880 } else if (strcmp(var, "core.worktree") == 0) {
881 if (!value)
882 return config_error_nonbool(var);
883 free(git_work_tree_cfg);
884 git_work_tree_cfg = xstrdup(value);
885 inside_work_tree = -1;
887 return 0;
890 int check_repository_format(void)
892 return check_repository_format_gently(get_git_dir(), NULL);
896 * Returns the "prefix", a path to the current working directory
897 * relative to the work tree root, or NULL, if the current working
898 * directory is not a strict subdirectory of the work tree root. The
899 * prefix always ends with a '/' character.
901 const char *setup_git_directory(void)
903 return setup_git_directory_gently(NULL);
906 const char *resolve_gitdir(const char *suspect)
908 if (is_git_directory(suspect))
909 return suspect;
910 return read_gitfile(suspect);
913 /* if any standard file descriptor is missing open it to /dev/null */
914 void sanitize_stdfds(void)
916 int fd = open("/dev/null", O_RDWR, 0);
917 while (fd != -1 && fd < 2)
918 fd = dup(fd);
919 if (fd == -1)
920 die_errno("open /dev/null or dup failed");
921 if (fd > 2)
922 close(fd);
925 int daemonize(void)
927 #ifdef NO_POSIX_GOODIES
928 errno = ENOSYS;
929 return -1;
930 #else
931 switch (fork()) {
932 case 0:
933 break;
934 case -1:
935 die_errno("fork failed");
936 default:
937 exit(0);
939 if (setsid() == -1)
940 die_errno("setsid failed");
941 close(0);
942 close(1);
943 close(2);
944 sanitize_stdfds();
945 return 0;
946 #endif