git-multimail: update to release 1.2.0
[git.git] / setup.c
bloba17c51e61d75ac8280bf04d95c50d7bdfd6d7a0e
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;
7 static int work_tree_config_is_bogus;
9 /*
10 * The input parameter must contain an absolute path, and it must already be
11 * normalized.
13 * Find the part of an absolute path that lies inside the work tree by
14 * dereferencing symlinks outside the work tree, for example:
15 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
16 * /dir/file (work tree is /) -> dir/file
17 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
18 * /dir/repolink/file (repolink points to /dir/repo) -> file
19 * /dir/repo (exactly equal to work tree) -> (empty string)
21 static int abspath_part_inside_repo(char *path)
23 size_t len;
24 size_t wtlen;
25 char *path0;
26 int off;
27 const char *work_tree = get_git_work_tree();
29 if (!work_tree)
30 return -1;
31 wtlen = strlen(work_tree);
32 len = strlen(path);
33 off = offset_1st_component(path);
35 /* check if work tree is already the prefix */
36 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
37 if (path[wtlen] == '/') {
38 memmove(path, path + wtlen + 1, len - wtlen);
39 return 0;
40 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
41 /* work tree is the root, or the whole path */
42 memmove(path, path + wtlen, len - wtlen + 1);
43 return 0;
45 /* work tree might match beginning of a symlink to work tree */
46 off = wtlen;
48 path0 = path;
49 path += off;
51 /* check each '/'-terminated level */
52 while (*path) {
53 path++;
54 if (*path == '/') {
55 *path = '\0';
56 if (strcmp(real_path(path0), work_tree) == 0) {
57 memmove(path0, path + 1, len - (path - path0));
58 return 0;
60 *path = '/';
64 /* check whole path */
65 if (strcmp(real_path(path0), work_tree) == 0) {
66 *path0 = '\0';
67 return 0;
70 return -1;
74 * Normalize "path", prepending the "prefix" for relative paths. If
75 * remaining_prefix is not NULL, return the actual prefix still
76 * remains in the path. For example, prefix = sub1/sub2/ and path is
78 * foo -> sub1/sub2/foo (full prefix)
79 * ../foo -> sub1/foo (remaining prefix is sub1/)
80 * ../../bar -> bar (no remaining prefix)
81 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
82 * `pwd`/../bar -> sub1/bar (no remaining prefix)
84 char *prefix_path_gently(const char *prefix, int len,
85 int *remaining_prefix, const char *path)
87 const char *orig = path;
88 char *sanitized;
89 if (is_absolute_path(orig)) {
90 sanitized = xmalloc(strlen(path) + 1);
91 if (remaining_prefix)
92 *remaining_prefix = 0;
93 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
94 free(sanitized);
95 return NULL;
97 if (abspath_part_inside_repo(sanitized)) {
98 free(sanitized);
99 return NULL;
101 } else {
102 sanitized = xmalloc(len + strlen(path) + 1);
103 if (len)
104 memcpy(sanitized, prefix, len);
105 strcpy(sanitized + len, path);
106 if (remaining_prefix)
107 *remaining_prefix = len;
108 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
109 free(sanitized);
110 return NULL;
113 return sanitized;
116 char *prefix_path(const char *prefix, int len, const char *path)
118 char *r = prefix_path_gently(prefix, len, NULL, path);
119 if (!r)
120 die("'%s' is outside repository", path);
121 return r;
124 int path_inside_repo(const char *prefix, const char *path)
126 int len = prefix ? strlen(prefix) : 0;
127 char *r = prefix_path_gently(prefix, len, NULL, path);
128 if (r) {
129 free(r);
130 return 1;
132 return 0;
135 int check_filename(const char *prefix, const char *arg)
137 const char *name;
138 struct stat st;
140 if (starts_with(arg, ":/")) {
141 if (arg[2] == '\0') /* ":/" is root dir, always exists */
142 return 1;
143 name = arg + 2;
144 } else if (!no_wildcard(arg))
145 return 1;
146 else if (prefix)
147 name = prefix_filename(prefix, strlen(prefix), arg);
148 else
149 name = arg;
150 if (!lstat(name, &st))
151 return 1; /* file exists */
152 if (errno == ENOENT || errno == ENOTDIR)
153 return 0; /* file does not exist */
154 die_errno("failed to stat '%s'", arg);
157 static void NORETURN die_verify_filename(const char *prefix,
158 const char *arg,
159 int diagnose_misspelt_rev)
161 if (!diagnose_misspelt_rev)
162 die("%s: no such path in the working tree.\n"
163 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
164 arg);
166 * Saying "'(icase)foo' does not exist in the index" when the
167 * user gave us ":(icase)foo" is just stupid. A magic pathspec
168 * begins with a colon and is followed by a non-alnum; do not
169 * let maybe_die_on_misspelt_object_name() even trigger.
171 if (!(arg[0] == ':' && !isalnum(arg[1])))
172 maybe_die_on_misspelt_object_name(arg, prefix);
174 /* ... or fall back the most general message. */
175 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
176 "Use '--' to separate paths from revisions, like this:\n"
177 "'git <command> [<revision>...] -- [<file>...]'", arg);
182 * Verify a filename that we got as an argument for a pathspec
183 * entry. Note that a filename that begins with "-" never verifies
184 * as true, because even if such a filename were to exist, we want
185 * it to be preceded by the "--" marker (or we want the user to
186 * use a format like "./-filename")
188 * The "diagnose_misspelt_rev" is used to provide a user-friendly
189 * diagnosis when dying upon finding that "name" is not a pathname.
190 * If set to 1, the diagnosis will try to diagnose "name" as an
191 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
192 * will only complain about an inexisting file.
194 * This function is typically called to check that a "file or rev"
195 * argument is unambiguous. In this case, the caller will want
196 * diagnose_misspelt_rev == 1 when verifying the first non-rev
197 * argument (which could have been a revision), and
198 * diagnose_misspelt_rev == 0 for the next ones (because we already
199 * saw a filename, there's not ambiguity anymore).
201 void verify_filename(const char *prefix,
202 const char *arg,
203 int diagnose_misspelt_rev)
205 if (*arg == '-')
206 die("bad flag '%s' used after filename", arg);
207 if (check_filename(prefix, arg))
208 return;
209 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
213 * Opposite of the above: the command line did not have -- marker
214 * and we parsed the arg as a refname. It should not be interpretable
215 * as a filename.
217 void verify_non_filename(const char *prefix, const char *arg)
219 if (!is_inside_work_tree() || is_inside_git_dir())
220 return;
221 if (*arg == '-')
222 return; /* flag */
223 if (!check_filename(prefix, arg))
224 return;
225 die("ambiguous argument '%s': both revision and filename\n"
226 "Use '--' to separate paths from revisions, like this:\n"
227 "'git <command> [<revision>...] -- [<file>...]'", arg);
230 int get_common_dir(struct strbuf *sb, const char *gitdir)
232 struct strbuf data = STRBUF_INIT;
233 struct strbuf path = STRBUF_INIT;
234 const char *git_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
235 int ret = 0;
236 if (git_common_dir) {
237 strbuf_addstr(sb, git_common_dir);
238 return 1;
240 strbuf_addf(&path, "%s/commondir", gitdir);
241 if (file_exists(path.buf)) {
242 if (strbuf_read_file(&data, path.buf, 0) <= 0)
243 die_errno(_("failed to read %s"), path.buf);
244 while (data.len && (data.buf[data.len - 1] == '\n' ||
245 data.buf[data.len - 1] == '\r'))
246 data.len--;
247 data.buf[data.len] = '\0';
248 strbuf_reset(&path);
249 if (!is_absolute_path(data.buf))
250 strbuf_addf(&path, "%s/", gitdir);
251 strbuf_addbuf(&path, &data);
252 strbuf_addstr(sb, real_path(path.buf));
253 ret = 1;
254 } else
255 strbuf_addstr(sb, gitdir);
256 strbuf_release(&data);
257 strbuf_release(&path);
258 return ret;
262 * Test if it looks like we're at a git directory.
263 * We want to see:
265 * - either an objects/ directory _or_ the proper
266 * GIT_OBJECT_DIRECTORY environment variable
267 * - a refs/ directory
268 * - either a HEAD symlink or a HEAD file that is formatted as
269 * a proper "ref:", or a regular file HEAD that has a properly
270 * formatted sha1 object name.
272 int is_git_directory(const char *suspect)
274 struct strbuf path = STRBUF_INIT;
275 int ret = 0;
276 size_t len;
278 /* Check worktree-related signatures */
279 strbuf_addf(&path, "%s/HEAD", suspect);
280 if (validate_headref(path.buf))
281 goto done;
283 strbuf_reset(&path);
284 get_common_dir(&path, suspect);
285 len = path.len;
287 /* Check non-worktree-related signatures */
288 if (getenv(DB_ENVIRONMENT)) {
289 if (access(getenv(DB_ENVIRONMENT), X_OK))
290 goto done;
292 else {
293 strbuf_setlen(&path, len);
294 strbuf_addstr(&path, "/objects");
295 if (access(path.buf, X_OK))
296 goto done;
299 strbuf_setlen(&path, len);
300 strbuf_addstr(&path, "/refs");
301 if (access(path.buf, X_OK))
302 goto done;
304 ret = 1;
305 done:
306 strbuf_release(&path);
307 return ret;
310 int is_inside_git_dir(void)
312 if (inside_git_dir < 0)
313 inside_git_dir = is_inside_dir(get_git_dir());
314 return inside_git_dir;
317 int is_inside_work_tree(void)
319 if (inside_work_tree < 0)
320 inside_work_tree = is_inside_dir(get_git_work_tree());
321 return inside_work_tree;
324 void setup_work_tree(void)
326 const char *work_tree, *git_dir;
327 static int initialized = 0;
329 if (initialized)
330 return;
332 if (work_tree_config_is_bogus)
333 die("unable to set up work tree using invalid config");
335 work_tree = get_git_work_tree();
336 git_dir = get_git_dir();
337 if (!is_absolute_path(git_dir))
338 git_dir = real_path(get_git_dir());
339 if (!work_tree || chdir(work_tree))
340 die("This operation must be run in a work tree");
343 * Make sure subsequent git processes find correct worktree
344 * if $GIT_WORK_TREE is set relative
346 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
347 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
349 set_git_dir(remove_leading_path(git_dir, work_tree));
350 initialized = 1;
353 static int check_repo_format(const char *var, const char *value, void *cb)
355 if (strcmp(var, "core.repositoryformatversion") == 0)
356 repository_format_version = git_config_int(var, value);
357 else if (strcmp(var, "core.sharedrepository") == 0)
358 shared_repository = git_config_perm(var, value);
359 return 0;
362 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
364 struct strbuf sb = STRBUF_INIT;
365 const char *repo_config;
366 config_fn_t fn;
367 int ret = 0;
369 if (get_common_dir(&sb, gitdir))
370 fn = check_repo_format;
371 else
372 fn = check_repository_format_version;
373 strbuf_addstr(&sb, "/config");
374 repo_config = sb.buf;
377 * git_config() can't be used here because it calls git_pathdup()
378 * to get $GIT_CONFIG/config. That call will make setup_git_env()
379 * set git_dir to ".git".
381 * We are in gitdir setup, no git dir has been found useable yet.
382 * Use a gentler version of git_config() to check if this repo
383 * is a good one.
385 git_config_early(fn, NULL, repo_config);
386 if (GIT_REPO_VERSION < repository_format_version) {
387 if (!nongit_ok)
388 die ("Expected git repo version <= %d, found %d",
389 GIT_REPO_VERSION, repository_format_version);
390 warning("Expected git repo version <= %d, found %d",
391 GIT_REPO_VERSION, repository_format_version);
392 warning("Please upgrade Git");
393 *nongit_ok = -1;
394 ret = -1;
396 strbuf_release(&sb);
397 return ret;
400 static void update_linked_gitdir(const char *gitfile, const char *gitdir)
402 struct strbuf path = STRBUF_INIT;
403 struct stat st;
405 strbuf_addf(&path, "%s/gitdir", gitdir);
406 if (stat(path.buf, &st) || st.st_mtime + 24 * 3600 < time(NULL))
407 write_file(path.buf, "%s", gitfile);
408 strbuf_release(&path);
412 * Try to read the location of the git directory from the .git file,
413 * return path to git directory if found.
415 * On failure, if return_error_code is not NULL, return_error_code
416 * will be set to an error code and NULL will be returned. If
417 * return_error_code is NULL the function will die instead (for most
418 * cases).
420 const char *read_gitfile_gently(const char *path, int *return_error_code)
422 const int max_file_size = 1 << 20; /* 1MB */
423 int error_code = 0;
424 char *buf = NULL;
425 char *dir = NULL;
426 const char *slash;
427 struct stat st;
428 int fd;
429 ssize_t len;
431 if (stat(path, &st)) {
432 error_code = READ_GITFILE_ERR_STAT_FAILED;
433 goto cleanup_return;
435 if (!S_ISREG(st.st_mode)) {
436 error_code = READ_GITFILE_ERR_NOT_A_FILE;
437 goto cleanup_return;
439 if (st.st_size > max_file_size) {
440 error_code = READ_GITFILE_ERR_TOO_LARGE;
441 goto cleanup_return;
443 fd = open(path, O_RDONLY);
444 if (fd < 0) {
445 error_code = READ_GITFILE_ERR_OPEN_FAILED;
446 goto cleanup_return;
448 buf = xmalloc(st.st_size + 1);
449 len = read_in_full(fd, buf, st.st_size);
450 close(fd);
451 if (len != st.st_size) {
452 error_code = READ_GITFILE_ERR_READ_FAILED;
453 goto cleanup_return;
455 buf[len] = '\0';
456 if (!starts_with(buf, "gitdir: ")) {
457 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
458 goto cleanup_return;
460 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
461 len--;
462 if (len < 9) {
463 error_code = READ_GITFILE_ERR_NO_PATH;
464 goto cleanup_return;
466 buf[len] = '\0';
467 dir = buf + 8;
469 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
470 size_t pathlen = slash+1 - path;
471 size_t dirlen = pathlen + len - 8;
472 dir = xmalloc(dirlen + 1);
473 strncpy(dir, path, pathlen);
474 strncpy(dir + pathlen, buf + 8, len - 8);
475 dir[dirlen] = '\0';
476 free(buf);
477 buf = dir;
479 if (!is_git_directory(dir)) {
480 error_code = READ_GITFILE_ERR_NOT_A_REPO;
481 goto cleanup_return;
483 update_linked_gitdir(path, dir);
484 path = real_path(dir);
486 cleanup_return:
487 if (return_error_code)
488 *return_error_code = error_code;
489 else if (error_code) {
490 switch (error_code) {
491 case READ_GITFILE_ERR_STAT_FAILED:
492 case READ_GITFILE_ERR_NOT_A_FILE:
493 /* non-fatal; follow return path */
494 break;
495 case READ_GITFILE_ERR_OPEN_FAILED:
496 die_errno("Error opening '%s'", path);
497 case READ_GITFILE_ERR_TOO_LARGE:
498 die("Too large to be a .git file: '%s'", path);
499 case READ_GITFILE_ERR_READ_FAILED:
500 die("Error reading %s", path);
501 case READ_GITFILE_ERR_INVALID_FORMAT:
502 die("Invalid gitfile format: %s", path);
503 case READ_GITFILE_ERR_NO_PATH:
504 die("No path in gitfile: %s", path);
505 case READ_GITFILE_ERR_NOT_A_REPO:
506 die("Not a git repository: %s", dir);
507 default:
508 assert(0);
512 free(buf);
513 return error_code ? NULL : path;
516 static const char *setup_explicit_git_dir(const char *gitdirenv,
517 struct strbuf *cwd,
518 int *nongit_ok)
520 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
521 const char *worktree;
522 char *gitfile;
523 int offset;
525 if (PATH_MAX - 40 < strlen(gitdirenv))
526 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
528 gitfile = (char*)read_gitfile(gitdirenv);
529 if (gitfile) {
530 gitfile = xstrdup(gitfile);
531 gitdirenv = gitfile;
534 if (!is_git_directory(gitdirenv)) {
535 if (nongit_ok) {
536 *nongit_ok = 1;
537 free(gitfile);
538 return NULL;
540 die("Not a git repository: '%s'", gitdirenv);
543 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
544 free(gitfile);
545 return NULL;
548 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
549 if (work_tree_env)
550 set_git_work_tree(work_tree_env);
551 else if (is_bare_repository_cfg > 0) {
552 if (git_work_tree_cfg) {
553 /* #22.2, #30 */
554 warning("core.bare and core.worktree do not make sense");
555 work_tree_config_is_bogus = 1;
558 /* #18, #26 */
559 set_git_dir(gitdirenv);
560 free(gitfile);
561 return NULL;
563 else if (git_work_tree_cfg) { /* #6, #14 */
564 if (is_absolute_path(git_work_tree_cfg))
565 set_git_work_tree(git_work_tree_cfg);
566 else {
567 char *core_worktree;
568 if (chdir(gitdirenv))
569 die_errno("Could not chdir to '%s'", gitdirenv);
570 if (chdir(git_work_tree_cfg))
571 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
572 core_worktree = xgetcwd();
573 if (chdir(cwd->buf))
574 die_errno("Could not come back to cwd");
575 set_git_work_tree(core_worktree);
576 free(core_worktree);
579 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
580 /* #16d */
581 set_git_dir(gitdirenv);
582 free(gitfile);
583 return NULL;
585 else /* #2, #10 */
586 set_git_work_tree(".");
588 /* set_git_work_tree() must have been called by now */
589 worktree = get_git_work_tree();
591 /* both get_git_work_tree() and cwd are already normalized */
592 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
593 set_git_dir(gitdirenv);
594 free(gitfile);
595 return NULL;
598 offset = dir_inside_of(cwd->buf, worktree);
599 if (offset >= 0) { /* cwd inside worktree? */
600 set_git_dir(real_path(gitdirenv));
601 if (chdir(worktree))
602 die_errno("Could not chdir to '%s'", worktree);
603 strbuf_addch(cwd, '/');
604 free(gitfile);
605 return cwd->buf + offset;
608 /* cwd outside worktree */
609 set_git_dir(gitdirenv);
610 free(gitfile);
611 return NULL;
614 static const char *setup_discovered_git_dir(const char *gitdir,
615 struct strbuf *cwd, int offset,
616 int *nongit_ok)
618 if (check_repository_format_gently(gitdir, nongit_ok))
619 return NULL;
621 /* --work-tree is set without --git-dir; use discovered one */
622 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
623 if (offset != cwd->len && !is_absolute_path(gitdir))
624 gitdir = xstrdup(real_path(gitdir));
625 if (chdir(cwd->buf))
626 die_errno("Could not come back to cwd");
627 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
630 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
631 if (is_bare_repository_cfg > 0) {
632 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
633 if (chdir(cwd->buf))
634 die_errno("Could not come back to cwd");
635 return NULL;
638 /* #0, #1, #5, #8, #9, #12, #13 */
639 set_git_work_tree(".");
640 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
641 set_git_dir(gitdir);
642 inside_git_dir = 0;
643 inside_work_tree = 1;
644 if (offset == cwd->len)
645 return NULL;
647 /* Make "offset" point to past the '/', and add a '/' at the end */
648 offset++;
649 strbuf_addch(cwd, '/');
650 return cwd->buf + offset;
653 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
654 static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
655 int *nongit_ok)
657 int root_len;
659 if (check_repository_format_gently(".", nongit_ok))
660 return NULL;
662 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
664 /* --work-tree is set without --git-dir; use discovered one */
665 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
666 const char *gitdir;
668 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
669 if (chdir(cwd->buf))
670 die_errno("Could not come back to cwd");
671 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
674 inside_git_dir = 1;
675 inside_work_tree = 0;
676 if (offset != cwd->len) {
677 if (chdir(cwd->buf))
678 die_errno("Cannot come back to cwd");
679 root_len = offset_1st_component(cwd->buf);
680 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
681 set_git_dir(cwd->buf);
683 else
684 set_git_dir(".");
685 return NULL;
688 static const char *setup_nongit(const char *cwd, int *nongit_ok)
690 if (!nongit_ok)
691 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
692 if (chdir(cwd))
693 die_errno("Cannot come back to cwd");
694 *nongit_ok = 1;
695 return NULL;
698 static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
700 struct stat buf;
701 if (stat(path, &buf)) {
702 die_errno("failed to stat '%*s%s%s'",
703 prefix_len,
704 prefix ? prefix : "",
705 prefix ? "/" : "", path);
707 return buf.st_dev;
711 * A "string_list_each_func_t" function that canonicalizes an entry
712 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
713 * discards it if unusable. The presence of an empty entry in
714 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
715 * subsequent entries.
717 static int canonicalize_ceiling_entry(struct string_list_item *item,
718 void *cb_data)
720 int *empty_entry_found = cb_data;
721 char *ceil = item->string;
723 if (!*ceil) {
724 *empty_entry_found = 1;
725 return 0;
726 } else if (!is_absolute_path(ceil)) {
727 return 0;
728 } else if (*empty_entry_found) {
729 /* Keep entry but do not canonicalize it */
730 return 1;
731 } else {
732 const char *real_path = real_path_if_valid(ceil);
733 if (!real_path)
734 return 0;
735 free(item->string);
736 item->string = xstrdup(real_path);
737 return 1;
742 * We cannot decide in this function whether we are in the work tree or
743 * not, since the config can only be read _after_ this function was called.
745 static const char *setup_git_directory_gently_1(int *nongit_ok)
747 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
748 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
749 static struct strbuf cwd = STRBUF_INIT;
750 const char *gitdirenv, *ret;
751 char *gitfile;
752 int offset, offset_parent, ceil_offset = -1;
753 dev_t current_device = 0;
754 int one_filesystem = 1;
757 * We may have read an incomplete configuration before
758 * setting-up the git directory. If so, clear the cache so
759 * that the next queries to the configuration reload complete
760 * configuration (including the per-repo config file that we
761 * ignored previously).
763 git_config_clear();
766 * Let's assume that we are in a git repository.
767 * If it turns out later that we are somewhere else, the value will be
768 * updated accordingly.
770 if (nongit_ok)
771 *nongit_ok = 0;
773 if (strbuf_getcwd(&cwd))
774 die_errno("Unable to read current working directory");
775 offset = cwd.len;
778 * If GIT_DIR is set explicitly, we're not going
779 * to do any discovery, but we still do repository
780 * validation.
782 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
783 if (gitdirenv)
784 return setup_explicit_git_dir(gitdirenv, &cwd, nongit_ok);
786 if (env_ceiling_dirs) {
787 int empty_entry_found = 0;
789 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
790 filter_string_list(&ceiling_dirs, 0,
791 canonicalize_ceiling_entry, &empty_entry_found);
792 ceil_offset = longest_ancestor_length(cwd.buf, &ceiling_dirs);
793 string_list_clear(&ceiling_dirs, 0);
796 if (ceil_offset < 0 && has_dos_drive_prefix(cwd.buf))
797 ceil_offset = 1;
800 * Test in the following order (relative to the cwd):
801 * - .git (file containing "gitdir: <path>")
802 * - .git/
803 * - ./ (bare)
804 * - ../.git
805 * - ../.git/
806 * - ../ (bare)
807 * - ../../.git/
808 * etc.
810 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
811 if (one_filesystem)
812 current_device = get_device_or_die(".", NULL, 0);
813 for (;;) {
814 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
815 if (gitfile)
816 gitdirenv = gitfile = xstrdup(gitfile);
817 else {
818 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
819 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
822 if (gitdirenv) {
823 ret = setup_discovered_git_dir(gitdirenv,
824 &cwd, offset,
825 nongit_ok);
826 free(gitfile);
827 return ret;
829 free(gitfile);
831 if (is_git_directory("."))
832 return setup_bare_git_dir(&cwd, offset, nongit_ok);
834 offset_parent = offset;
835 while (--offset_parent > ceil_offset && cwd.buf[offset_parent] != '/');
836 if (offset_parent <= ceil_offset)
837 return setup_nongit(cwd.buf, nongit_ok);
838 if (one_filesystem) {
839 dev_t parent_device = get_device_or_die("..", cwd.buf,
840 offset);
841 if (parent_device != current_device) {
842 if (nongit_ok) {
843 if (chdir(cwd.buf))
844 die_errno("Cannot come back to cwd");
845 *nongit_ok = 1;
846 return NULL;
848 strbuf_setlen(&cwd, offset);
849 die("Not a git repository (or any parent up to mount point %s)\n"
850 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).",
851 cwd.buf);
854 if (chdir("..")) {
855 strbuf_setlen(&cwd, offset);
856 die_errno("Cannot change to '%s/..'", cwd.buf);
858 offset = offset_parent;
862 const char *setup_git_directory_gently(int *nongit_ok)
864 const char *prefix;
866 prefix = setup_git_directory_gently_1(nongit_ok);
867 if (prefix)
868 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
869 else
870 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
872 if (startup_info) {
873 startup_info->have_repository = !nongit_ok || !*nongit_ok;
874 startup_info->prefix = prefix;
876 return prefix;
879 int git_config_perm(const char *var, const char *value)
881 int i;
882 char *endptr;
884 if (value == NULL)
885 return PERM_GROUP;
887 if (!strcmp(value, "umask"))
888 return PERM_UMASK;
889 if (!strcmp(value, "group"))
890 return PERM_GROUP;
891 if (!strcmp(value, "all") ||
892 !strcmp(value, "world") ||
893 !strcmp(value, "everybody"))
894 return PERM_EVERYBODY;
896 /* Parse octal numbers */
897 i = strtol(value, &endptr, 8);
899 /* If not an octal number, maybe true/false? */
900 if (*endptr != 0)
901 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
904 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
905 * a chmod value to restrict to.
907 switch (i) {
908 case PERM_UMASK: /* 0 */
909 return PERM_UMASK;
910 case OLD_PERM_GROUP: /* 1 */
911 return PERM_GROUP;
912 case OLD_PERM_EVERYBODY: /* 2 */
913 return PERM_EVERYBODY;
916 /* A filemode value was given: 0xxx */
918 if ((i & 0600) != 0600)
919 die("Problem with core.sharedRepository filemode value "
920 "(0%.3o).\nThe owner of files must always have "
921 "read and write permissions.", i);
924 * Mask filemode value. Others can not get write permission.
925 * x flags for directories are handled separately.
927 return -(i & 0666);
930 int check_repository_format_version(const char *var, const char *value, void *cb)
932 int ret = check_repo_format(var, value, cb);
933 if (ret)
934 return ret;
935 if (strcmp(var, "core.bare") == 0) {
936 is_bare_repository_cfg = git_config_bool(var, value);
937 if (is_bare_repository_cfg == 1)
938 inside_work_tree = -1;
939 } else if (strcmp(var, "core.worktree") == 0) {
940 if (!value)
941 return config_error_nonbool(var);
942 free(git_work_tree_cfg);
943 git_work_tree_cfg = xstrdup(value);
944 inside_work_tree = -1;
946 return 0;
949 int check_repository_format(void)
951 return check_repository_format_gently(get_git_dir(), NULL);
955 * Returns the "prefix", a path to the current working directory
956 * relative to the work tree root, or NULL, if the current working
957 * directory is not a strict subdirectory of the work tree root. The
958 * prefix always ends with a '/' character.
960 const char *setup_git_directory(void)
962 return setup_git_directory_gently(NULL);
965 const char *resolve_gitdir(const char *suspect)
967 if (is_git_directory(suspect))
968 return suspect;
969 return read_gitfile(suspect);
972 /* if any standard file descriptor is missing open it to /dev/null */
973 void sanitize_stdfds(void)
975 int fd = open("/dev/null", O_RDWR, 0);
976 while (fd != -1 && fd < 2)
977 fd = dup(fd);
978 if (fd == -1)
979 die_errno("open /dev/null or dup failed");
980 if (fd > 2)
981 close(fd);
984 int daemonize(void)
986 #ifdef NO_POSIX_GOODIES
987 errno = ENOSYS;
988 return -1;
989 #else
990 switch (fork()) {
991 case 0:
992 break;
993 case -1:
994 die_errno("fork failed");
995 default:
996 exit(0);
998 if (setsid() == -1)
999 die_errno("setsid failed");
1000 close(0);
1001 close(1);
1002 close(2);
1003 sanitize_stdfds();
1004 return 0;
1005 #endif