Merge branch 'master' of git://git.kernel.org/pub/scm/git/git
[git/jnareb-git.git] / setup.c
blob94c1e61bda747ed5c664bbbf8431234dc8276d29
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 static char *prefix_path_gently(const char *prefix, int len, const char *path)
10 const char *orig = path;
11 char *sanitized;
12 if (is_absolute_path(orig)) {
13 const char *temp = real_path(path);
14 sanitized = xmalloc(len + strlen(temp) + 1);
15 strcpy(sanitized, temp);
16 } else {
17 sanitized = xmalloc(len + strlen(path) + 1);
18 if (len)
19 memcpy(sanitized, prefix, len);
20 strcpy(sanitized + len, path);
22 if (normalize_path_copy(sanitized, sanitized))
23 goto error_out;
24 if (is_absolute_path(orig)) {
25 size_t root_len, len, total;
26 const char *work_tree = get_git_work_tree();
27 if (!work_tree)
28 goto error_out;
29 len = strlen(work_tree);
30 root_len = offset_1st_component(work_tree);
31 total = strlen(sanitized) + 1;
32 if (strncmp(sanitized, work_tree, len) ||
33 (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
34 error_out:
35 free(sanitized);
36 return NULL;
38 if (sanitized[len] == '/')
39 len++;
40 memmove(sanitized, sanitized + len, total - len);
42 return sanitized;
45 char *prefix_path(const char *prefix, int len, const char *path)
47 char *r = prefix_path_gently(prefix, len, path);
48 if (!r)
49 die("'%s' is outside repository", path);
50 return r;
53 int path_inside_repo(const char *prefix, const char *path)
55 int len = prefix ? strlen(prefix) : 0;
56 char *r = prefix_path_gently(prefix, len, path);
57 if (r) {
58 free(r);
59 return 1;
61 return 0;
64 int check_filename(const char *prefix, const char *arg)
66 const char *name;
67 struct stat st;
69 if (!prefixcmp(arg, ":/")) {
70 if (arg[2] == '\0') /* ":/" is root dir, always exists */
71 return 1;
72 name = arg + 2;
73 } else if (prefix)
74 name = prefix_filename(prefix, strlen(prefix), arg);
75 else
76 name = arg;
77 if (!lstat(name, &st))
78 return 1; /* file exists */
79 if (errno == ENOENT || errno == ENOTDIR)
80 return 0; /* file does not exist */
81 die_errno("failed to stat '%s'", arg);
84 static void NORETURN die_verify_filename(const char *prefix,
85 const char *arg,
86 int diagnose_misspelt_rev)
88 if (!diagnose_misspelt_rev)
89 die("%s: no such path in the working tree.\n"
90 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
91 arg);
93 * Saying "'(icase)foo' does not exist in the index" when the
94 * user gave us ":(icase)foo" is just stupid. A magic pathspec
95 * begins with a colon and is followed by a non-alnum; do not
96 * let maybe_die_on_misspelt_object_name() even trigger.
98 if (!(arg[0] == ':' && !isalnum(arg[1])))
99 maybe_die_on_misspelt_object_name(arg, prefix);
101 /* ... or fall back the most general message. */
102 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
103 "Use '--' to separate paths from revisions, like this:\n"
104 "'git <command> [<revision>...] -- [<file>...]'", arg);
109 * Verify a filename that we got as an argument for a pathspec
110 * entry. Note that a filename that begins with "-" never verifies
111 * as true, because even if such a filename were to exist, we want
112 * it to be preceded by the "--" marker (or we want the user to
113 * use a format like "./-filename")
115 * The "diagnose_misspelt_rev" is used to provide a user-friendly
116 * diagnosis when dying upon finding that "name" is not a pathname.
117 * If set to 1, the diagnosis will try to diagnose "name" as an
118 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
119 * will only complain about an inexisting file.
121 * This function is typically called to check that a "file or rev"
122 * argument is unambiguous. In this case, the caller will want
123 * diagnose_misspelt_rev == 1 when verifying the first non-rev
124 * argument (which could have been a revision), and
125 * diagnose_misspelt_rev == 0 for the next ones (because we already
126 * saw a filename, there's not ambiguity anymore).
128 void verify_filename(const char *prefix,
129 const char *arg,
130 int diagnose_misspelt_rev)
132 if (*arg == '-')
133 die("bad flag '%s' used after filename", arg);
134 if (check_filename(prefix, arg))
135 return;
136 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
140 * Opposite of the above: the command line did not have -- marker
141 * and we parsed the arg as a refname. It should not be interpretable
142 * as a filename.
144 void verify_non_filename(const char *prefix, const char *arg)
146 if (!is_inside_work_tree() || is_inside_git_dir())
147 return;
148 if (*arg == '-')
149 return; /* flag */
150 if (!check_filename(prefix, arg))
151 return;
152 die("ambiguous argument '%s': both revision and filename\n"
153 "Use '--' to separate paths from revisions, like this:\n"
154 "'git <command> [<revision>...] -- [<file>...]'", arg);
158 * Magic pathspec
160 * NEEDSWORK: These need to be moved to dir.h or even to a new
161 * pathspec.h when we restructure get_pathspec() users to use the
162 * "struct pathspec" interface.
164 * Possible future magic semantics include stuff like:
166 * { PATHSPEC_NOGLOB, '!', "noglob" },
167 * { PATHSPEC_ICASE, '\0', "icase" },
168 * { PATHSPEC_RECURSIVE, '*', "recursive" },
169 * { PATHSPEC_REGEXP, '\0', "regexp" },
172 #define PATHSPEC_FROMTOP (1<<0)
174 static struct pathspec_magic {
175 unsigned bit;
176 char mnemonic; /* this cannot be ':'! */
177 const char *name;
178 } pathspec_magic[] = {
179 { PATHSPEC_FROMTOP, '/', "top" },
183 * Take an element of a pathspec and check for magic signatures.
184 * Append the result to the prefix.
186 * For now, we only parse the syntax and throw out anything other than
187 * "top" magic.
189 * NEEDSWORK: This needs to be rewritten when we start migrating
190 * get_pathspec() users to use the "struct pathspec" interface. For
191 * example, a pathspec element may be marked as case-insensitive, but
192 * the prefix part must always match literally, and a single stupid
193 * string cannot express such a case.
195 static const char *prefix_pathspec(const char *prefix, int prefixlen, const char *elt)
197 unsigned magic = 0;
198 const char *copyfrom = elt;
199 int i;
201 if (elt[0] != ':') {
202 ; /* nothing to do */
203 } else if (elt[1] == '(') {
204 /* longhand */
205 const char *nextat;
206 for (copyfrom = elt + 2;
207 *copyfrom && *copyfrom != ')';
208 copyfrom = nextat) {
209 size_t len = strcspn(copyfrom, ",)");
210 if (copyfrom[len] == ',')
211 nextat = copyfrom + len + 1;
212 else
213 /* handle ')' and '\0' */
214 nextat = copyfrom + len;
215 if (!len)
216 continue;
217 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
218 if (strlen(pathspec_magic[i].name) == len &&
219 !strncmp(pathspec_magic[i].name, copyfrom, len)) {
220 magic |= pathspec_magic[i].bit;
221 break;
223 if (ARRAY_SIZE(pathspec_magic) <= i)
224 die("Invalid pathspec magic '%.*s' in '%s'",
225 (int) len, copyfrom, elt);
227 if (*copyfrom != ')')
228 die("Missing ')' at the end of pathspec magic in '%s'", elt);
229 copyfrom++;
230 } else {
231 /* shorthand */
232 for (copyfrom = elt + 1;
233 *copyfrom && *copyfrom != ':';
234 copyfrom++) {
235 char ch = *copyfrom;
237 if (!is_pathspec_magic(ch))
238 break;
239 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
240 if (pathspec_magic[i].mnemonic == ch) {
241 magic |= pathspec_magic[i].bit;
242 break;
244 if (ARRAY_SIZE(pathspec_magic) <= i)
245 die("Unimplemented pathspec magic '%c' in '%s'",
246 ch, elt);
248 if (*copyfrom == ':')
249 copyfrom++;
252 if (magic & PATHSPEC_FROMTOP)
253 return xstrdup(copyfrom);
254 else
255 return prefix_path(prefix, prefixlen, copyfrom);
259 * N.B. get_pathspec() is deprecated in favor of the "struct pathspec"
260 * based interface - see pathspec_magic above.
262 * Arguments:
263 * - prefix - a path relative to the root of the working tree
264 * - pathspec - a list of paths underneath the prefix path
266 * Iterates over pathspec, prepending each path with prefix,
267 * and return the resulting list.
269 * If pathspec is empty, return a singleton list containing prefix.
271 * If pathspec and prefix are both empty, return an empty list.
273 * This is typically used by built-in commands such as add.c, in order
274 * to normalize argv arguments provided to the built-in into a list of
275 * paths to process, all relative to the root of the working tree.
277 const char **get_pathspec(const char *prefix, const char **pathspec)
279 const char *entry = *pathspec;
280 const char **src, **dst;
281 int prefixlen;
283 if (!prefix && !entry)
284 return NULL;
286 if (!entry) {
287 static const char *spec[2];
288 spec[0] = prefix;
289 spec[1] = NULL;
290 return spec;
293 /* Otherwise we have to re-write the entries.. */
294 src = pathspec;
295 dst = pathspec;
296 prefixlen = prefix ? strlen(prefix) : 0;
297 while (*src) {
298 *(dst++) = prefix_pathspec(prefix, prefixlen, *src);
299 src++;
301 *dst = NULL;
302 if (!*pathspec)
303 return NULL;
304 return pathspec;
308 * Test if it looks like we're at a git directory.
309 * We want to see:
311 * - either an objects/ directory _or_ the proper
312 * GIT_OBJECT_DIRECTORY environment variable
313 * - a refs/ directory
314 * - either a HEAD symlink or a HEAD file that is formatted as
315 * a proper "ref:", or a regular file HEAD that has a properly
316 * formatted sha1 object name.
318 int is_git_directory(const char *suspect)
320 char path[PATH_MAX];
321 size_t len = strlen(suspect);
323 if (PATH_MAX <= len + strlen("/objects"))
324 die("Too long path: %.*s", 60, suspect);
325 strcpy(path, suspect);
326 if (getenv(DB_ENVIRONMENT)) {
327 if (access(getenv(DB_ENVIRONMENT), X_OK))
328 return 0;
330 else {
331 strcpy(path + len, "/objects");
332 if (access(path, X_OK))
333 return 0;
336 strcpy(path + len, "/refs");
337 if (access(path, X_OK))
338 return 0;
340 strcpy(path + len, "/HEAD");
341 if (validate_headref(path))
342 return 0;
344 return 1;
347 int is_inside_git_dir(void)
349 if (inside_git_dir < 0)
350 inside_git_dir = is_inside_dir(get_git_dir());
351 return inside_git_dir;
354 int is_inside_work_tree(void)
356 if (inside_work_tree < 0)
357 inside_work_tree = is_inside_dir(get_git_work_tree());
358 return inside_work_tree;
361 void setup_work_tree(void)
363 const char *work_tree, *git_dir;
364 static int initialized = 0;
366 if (initialized)
367 return;
368 work_tree = get_git_work_tree();
369 git_dir = get_git_dir();
370 if (!is_absolute_path(git_dir))
371 git_dir = real_path(get_git_dir());
372 if (!work_tree || chdir(work_tree))
373 die("This operation must be run in a work tree");
376 * Make sure subsequent git processes find correct worktree
377 * if $GIT_WORK_TREE is set relative
379 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
380 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
382 set_git_dir(relative_path(git_dir, work_tree));
383 initialized = 1;
386 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
388 char repo_config[PATH_MAX+1];
391 * git_config() can't be used here because it calls git_pathdup()
392 * to get $GIT_CONFIG/config. That call will make setup_git_env()
393 * set git_dir to ".git".
395 * We are in gitdir setup, no git dir has been found useable yet.
396 * Use a gentler version of git_config() to check if this repo
397 * is a good one.
399 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
400 git_config_early(check_repository_format_version, NULL, repo_config);
401 if (GIT_REPO_VERSION < repository_format_version) {
402 if (!nongit_ok)
403 die ("Expected git repo version <= %d, found %d",
404 GIT_REPO_VERSION, repository_format_version);
405 warning("Expected git repo version <= %d, found %d",
406 GIT_REPO_VERSION, repository_format_version);
407 warning("Please upgrade Git");
408 *nongit_ok = -1;
409 return -1;
411 return 0;
415 * Try to read the location of the git directory from the .git file,
416 * return path to git directory if found.
418 const char *read_gitfile(const char *path)
420 char *buf;
421 char *dir;
422 const char *slash;
423 struct stat st;
424 int fd;
425 ssize_t len;
427 if (stat(path, &st))
428 return NULL;
429 if (!S_ISREG(st.st_mode))
430 return NULL;
431 fd = open(path, O_RDONLY);
432 if (fd < 0)
433 die_errno("Error opening '%s'", path);
434 buf = xmalloc(st.st_size + 1);
435 len = read_in_full(fd, buf, st.st_size);
436 close(fd);
437 if (len != st.st_size)
438 die("Error reading %s", path);
439 buf[len] = '\0';
440 if (prefixcmp(buf, "gitdir: "))
441 die("Invalid gitfile format: %s", path);
442 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
443 len--;
444 if (len < 9)
445 die("No path in gitfile: %s", path);
446 buf[len] = '\0';
447 dir = buf + 8;
449 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
450 size_t pathlen = slash+1 - path;
451 size_t dirlen = pathlen + len - 8;
452 dir = xmalloc(dirlen + 1);
453 strncpy(dir, path, pathlen);
454 strncpy(dir + pathlen, buf + 8, len - 8);
455 dir[dirlen] = '\0';
456 free(buf);
457 buf = dir;
460 if (!is_git_directory(dir))
461 die("Not a git repository: %s", dir);
462 path = real_path(dir);
464 free(buf);
465 return path;
468 static const char *setup_explicit_git_dir(const char *gitdirenv,
469 char *cwd, int len,
470 int *nongit_ok)
472 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
473 const char *worktree;
474 char *gitfile;
475 int offset;
477 if (PATH_MAX - 40 < strlen(gitdirenv))
478 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
480 gitfile = (char*)read_gitfile(gitdirenv);
481 if (gitfile) {
482 gitfile = xstrdup(gitfile);
483 gitdirenv = gitfile;
486 if (!is_git_directory(gitdirenv)) {
487 if (nongit_ok) {
488 *nongit_ok = 1;
489 free(gitfile);
490 return NULL;
492 die("Not a git repository: '%s'", gitdirenv);
495 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
496 free(gitfile);
497 return NULL;
500 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
501 if (work_tree_env)
502 set_git_work_tree(work_tree_env);
503 else if (is_bare_repository_cfg > 0) {
504 if (git_work_tree_cfg) /* #22.2, #30 */
505 die("core.bare and core.worktree do not make sense");
507 /* #18, #26 */
508 set_git_dir(gitdirenv);
509 free(gitfile);
510 return NULL;
512 else if (git_work_tree_cfg) { /* #6, #14 */
513 if (is_absolute_path(git_work_tree_cfg))
514 set_git_work_tree(git_work_tree_cfg);
515 else {
516 char core_worktree[PATH_MAX];
517 if (chdir(gitdirenv))
518 die_errno("Could not chdir to '%s'", gitdirenv);
519 if (chdir(git_work_tree_cfg))
520 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
521 if (!getcwd(core_worktree, PATH_MAX))
522 die_errno("Could not get directory '%s'", git_work_tree_cfg);
523 if (chdir(cwd))
524 die_errno("Could not come back to cwd");
525 set_git_work_tree(core_worktree);
528 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
529 /* #16d */
530 set_git_dir(gitdirenv);
531 free(gitfile);
532 return NULL;
534 else /* #2, #10 */
535 set_git_work_tree(".");
537 /* set_git_work_tree() must have been called by now */
538 worktree = get_git_work_tree();
540 /* both get_git_work_tree() and cwd are already normalized */
541 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
542 set_git_dir(gitdirenv);
543 free(gitfile);
544 return NULL;
547 offset = dir_inside_of(cwd, worktree);
548 if (offset >= 0) { /* cwd inside worktree? */
549 set_git_dir(real_path(gitdirenv));
550 if (chdir(worktree))
551 die_errno("Could not chdir to '%s'", worktree);
552 cwd[len++] = '/';
553 cwd[len] = '\0';
554 free(gitfile);
555 return cwd + offset;
558 /* cwd outside worktree */
559 set_git_dir(gitdirenv);
560 free(gitfile);
561 return NULL;
564 static const char *setup_discovered_git_dir(const char *gitdir,
565 char *cwd, int offset, int len,
566 int *nongit_ok)
568 if (check_repository_format_gently(gitdir, nongit_ok))
569 return NULL;
571 /* --work-tree is set without --git-dir; use discovered one */
572 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
573 if (offset != len && !is_absolute_path(gitdir))
574 gitdir = xstrdup(real_path(gitdir));
575 if (chdir(cwd))
576 die_errno("Could not come back to cwd");
577 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
580 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
581 if (is_bare_repository_cfg > 0) {
582 set_git_dir(offset == len ? gitdir : real_path(gitdir));
583 if (chdir(cwd))
584 die_errno("Could not come back to cwd");
585 return NULL;
588 /* #0, #1, #5, #8, #9, #12, #13 */
589 set_git_work_tree(".");
590 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
591 set_git_dir(gitdir);
592 inside_git_dir = 0;
593 inside_work_tree = 1;
594 if (offset == len)
595 return NULL;
597 /* Make "offset" point to past the '/', and add a '/' at the end */
598 offset++;
599 cwd[len++] = '/';
600 cwd[len] = 0;
601 return cwd + offset;
604 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
605 static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
607 int root_len;
609 if (check_repository_format_gently(".", nongit_ok))
610 return NULL;
612 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
614 /* --work-tree is set without --git-dir; use discovered one */
615 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
616 const char *gitdir;
618 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
619 if (chdir(cwd))
620 die_errno("Could not come back to cwd");
621 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
624 inside_git_dir = 1;
625 inside_work_tree = 0;
626 if (offset != len) {
627 if (chdir(cwd))
628 die_errno("Cannot come back to cwd");
629 root_len = offset_1st_component(cwd);
630 cwd[offset > root_len ? offset : root_len] = '\0';
631 set_git_dir(cwd);
633 else
634 set_git_dir(".");
635 return NULL;
638 static const char *setup_nongit(const char *cwd, int *nongit_ok)
640 if (!nongit_ok)
641 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
642 if (chdir(cwd))
643 die_errno("Cannot come back to cwd");
644 *nongit_ok = 1;
645 return NULL;
648 static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
650 struct stat buf;
651 if (stat(path, &buf)) {
652 die_errno("failed to stat '%*s%s%s'",
653 prefix_len,
654 prefix ? prefix : "",
655 prefix ? "/" : "", path);
657 return buf.st_dev;
661 * A "string_list_each_func_t" function that canonicalizes an entry
662 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
663 * discards it if unusable. The presence of an empty entry in
664 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
665 * subsequent entries.
667 static int canonicalize_ceiling_entry(struct string_list_item *item,
668 void *cb_data)
670 int *empty_entry_found = cb_data;
671 char *ceil = item->string;
673 if (!*ceil) {
674 *empty_entry_found = 1;
675 return 0;
676 } else if (!is_absolute_path(ceil)) {
677 return 0;
678 } else if (*empty_entry_found) {
679 /* Keep entry but do not canonicalize it */
680 return 1;
681 } else {
682 const char *real_path = real_path_if_valid(ceil);
683 if (!real_path)
684 return 0;
685 free(item->string);
686 item->string = xstrdup(real_path);
687 return 1;
692 * We cannot decide in this function whether we are in the work tree or
693 * not, since the config can only be read _after_ this function was called.
695 static const char *setup_git_directory_gently_1(int *nongit_ok)
697 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
698 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
699 static char cwd[PATH_MAX+1];
700 const char *gitdirenv, *ret;
701 char *gitfile;
702 int len, offset, offset_parent, ceil_offset = -1;
703 dev_t current_device = 0;
704 int one_filesystem = 1;
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 (!getcwd(cwd, sizeof(cwd)-1))
715 die_errno("Unable to read current working directory");
716 offset = len = strlen(cwd);
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, len, 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, &ceiling_dirs);
734 string_list_clear(&ceiling_dirs, 0);
737 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
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, len,
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, len, nongit_ok);
775 offset_parent = offset;
776 while (--offset_parent > ceil_offset && cwd[offset_parent] != '/');
777 if (offset_parent <= ceil_offset)
778 return setup_nongit(cwd, nongit_ok);
779 if (one_filesystem) {
780 dev_t parent_device = get_device_or_die("..", cwd, offset);
781 if (parent_device != current_device) {
782 if (nongit_ok) {
783 if (chdir(cwd))
784 die_errno("Cannot come back to cwd");
785 *nongit_ok = 1;
786 return NULL;
788 cwd[offset] = '\0';
789 die("Not a git repository (or any parent up to mount point %s)\n"
790 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
793 if (chdir("..")) {
794 cwd[offset] = '\0';
795 die_errno("Cannot change to '%s/..'", cwd);
797 offset = offset_parent;
801 const char *setup_git_directory_gently(int *nongit_ok)
803 const char *prefix;
805 prefix = setup_git_directory_gently_1(nongit_ok);
806 if (prefix)
807 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
808 else
809 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
811 if (startup_info) {
812 startup_info->have_repository = !nongit_ok || !*nongit_ok;
813 startup_info->prefix = prefix;
815 return prefix;
818 int git_config_perm(const char *var, const char *value)
820 int i;
821 char *endptr;
823 if (value == NULL)
824 return PERM_GROUP;
826 if (!strcmp(value, "umask"))
827 return PERM_UMASK;
828 if (!strcmp(value, "group"))
829 return PERM_GROUP;
830 if (!strcmp(value, "all") ||
831 !strcmp(value, "world") ||
832 !strcmp(value, "everybody"))
833 return PERM_EVERYBODY;
835 /* Parse octal numbers */
836 i = strtol(value, &endptr, 8);
838 /* If not an octal number, maybe true/false? */
839 if (*endptr != 0)
840 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
843 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
844 * a chmod value to restrict to.
846 switch (i) {
847 case PERM_UMASK: /* 0 */
848 return PERM_UMASK;
849 case OLD_PERM_GROUP: /* 1 */
850 return PERM_GROUP;
851 case OLD_PERM_EVERYBODY: /* 2 */
852 return PERM_EVERYBODY;
855 /* A filemode value was given: 0xxx */
857 if ((i & 0600) != 0600)
858 die("Problem with core.sharedRepository filemode value "
859 "(0%.3o).\nThe owner of files must always have "
860 "read and write permissions.", i);
863 * Mask filemode value. Others can not get write permission.
864 * x flags for directories are handled separately.
866 return -(i & 0666);
869 int check_repository_format_version(const char *var, const char *value, void *cb)
871 if (strcmp(var, "core.repositoryformatversion") == 0)
872 repository_format_version = git_config_int(var, value);
873 else if (strcmp(var, "core.sharedrepository") == 0)
874 shared_repository = git_config_perm(var, value);
875 else if (strcmp(var, "core.bare") == 0) {
876 is_bare_repository_cfg = git_config_bool(var, value);
877 if (is_bare_repository_cfg == 1)
878 inside_work_tree = -1;
879 } else if (strcmp(var, "core.worktree") == 0) {
880 if (!value)
881 return config_error_nonbool(var);
882 free(git_work_tree_cfg);
883 git_work_tree_cfg = xstrdup(value);
884 inside_work_tree = -1;
886 return 0;
889 int check_repository_format(void)
891 return check_repository_format_gently(get_git_dir(), NULL);
895 * Returns the "prefix", a path to the current working directory
896 * relative to the work tree root, or NULL, if the current working
897 * directory is not a strict subdirectory of the work tree root. The
898 * prefix always ends with a '/' character.
900 const char *setup_git_directory(void)
902 return setup_git_directory_gently(NULL);
905 const char *resolve_gitdir(const char *suspect)
907 if (is_git_directory(suspect))
908 return suspect;
909 return read_gitfile(suspect);