branch: add test for -m renaming multiple config sections
[git.git] / setup.c
blobe3f7699a902aed20a83820067cf913df2f3750a9
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 static struct startup_info the_startup_info;
10 struct startup_info *startup_info = &the_startup_info;
13 * The input parameter must contain an absolute path, and it must already be
14 * normalized.
16 * Find the part of an absolute path that lies inside the work tree by
17 * dereferencing symlinks outside the work tree, for example:
18 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
19 * /dir/file (work tree is /) -> dir/file
20 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
21 * /dir/repolink/file (repolink points to /dir/repo) -> file
22 * /dir/repo (exactly equal to work tree) -> (empty string)
24 static int abspath_part_inside_repo(char *path)
26 size_t len;
27 size_t wtlen;
28 char *path0;
29 int off;
30 const char *work_tree = get_git_work_tree();
32 if (!work_tree)
33 return -1;
34 wtlen = strlen(work_tree);
35 len = strlen(path);
36 off = offset_1st_component(path);
38 /* check if work tree is already the prefix */
39 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
40 if (path[wtlen] == '/') {
41 memmove(path, path + wtlen + 1, len - wtlen);
42 return 0;
43 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
44 /* work tree is the root, or the whole path */
45 memmove(path, path + wtlen, len - wtlen + 1);
46 return 0;
48 /* work tree might match beginning of a symlink to work tree */
49 off = wtlen;
51 path0 = path;
52 path += off;
54 /* check each '/'-terminated level */
55 while (*path) {
56 path++;
57 if (*path == '/') {
58 *path = '\0';
59 if (strcmp(real_path(path0), work_tree) == 0) {
60 memmove(path0, path + 1, len - (path - path0));
61 return 0;
63 *path = '/';
67 /* check whole path */
68 if (strcmp(real_path(path0), work_tree) == 0) {
69 *path0 = '\0';
70 return 0;
73 return -1;
77 * Normalize "path", prepending the "prefix" for relative paths. If
78 * remaining_prefix is not NULL, return the actual prefix still
79 * remains in the path. For example, prefix = sub1/sub2/ and path is
81 * foo -> sub1/sub2/foo (full prefix)
82 * ../foo -> sub1/foo (remaining prefix is sub1/)
83 * ../../bar -> bar (no remaining prefix)
84 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
85 * `pwd`/../bar -> sub1/bar (no remaining prefix)
87 char *prefix_path_gently(const char *prefix, int len,
88 int *remaining_prefix, const char *path)
90 const char *orig = path;
91 char *sanitized;
92 if (is_absolute_path(orig)) {
93 sanitized = xmallocz(strlen(path));
94 if (remaining_prefix)
95 *remaining_prefix = 0;
96 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
97 free(sanitized);
98 return NULL;
100 if (abspath_part_inside_repo(sanitized)) {
101 free(sanitized);
102 return NULL;
104 } else {
105 sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", 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 char *to_free = NULL;
139 struct stat st;
141 if (starts_with(arg, ":/")) {
142 if (arg[2] == '\0') /* ":/" is root dir, always exists */
143 return 1;
144 name = arg + 2;
145 } else if (prefix)
146 name = to_free = prefix_filename(prefix, arg);
147 else
148 name = arg;
149 if (!lstat(name, &st)) {
150 free(to_free);
151 return 1; /* file exists */
153 if (errno == ENOENT || errno == ENOTDIR) {
154 free(to_free);
155 return 0; /* file does not exist */
157 die_errno("failed to stat '%s'", arg);
160 static void NORETURN die_verify_filename(const char *prefix,
161 const char *arg,
162 int diagnose_misspelt_rev)
164 if (!diagnose_misspelt_rev)
165 die(_("%s: no such path in the working tree.\n"
166 "Use 'git <command> -- <path>...' to specify paths that do not exist locally."),
167 arg);
169 * Saying "'(icase)foo' does not exist in the index" when the
170 * user gave us ":(icase)foo" is just stupid. A magic pathspec
171 * begins with a colon and is followed by a non-alnum; do not
172 * let maybe_die_on_misspelt_object_name() even trigger.
174 if (!(arg[0] == ':' && !isalnum(arg[1])))
175 maybe_die_on_misspelt_object_name(arg, prefix);
177 /* ... or fall back the most general message. */
178 die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
179 "Use '--' to separate paths from revisions, like this:\n"
180 "'git <command> [<revision>...] -- [<file>...]'"), arg);
185 * Verify a filename that we got as an argument for a pathspec
186 * entry. Note that a filename that begins with "-" never verifies
187 * as true, because even if such a filename were to exist, we want
188 * it to be preceded by the "--" marker (or we want the user to
189 * use a format like "./-filename")
191 * The "diagnose_misspelt_rev" is used to provide a user-friendly
192 * diagnosis when dying upon finding that "name" is not a pathname.
193 * If set to 1, the diagnosis will try to diagnose "name" as an
194 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
195 * will only complain about an inexisting file.
197 * This function is typically called to check that a "file or rev"
198 * argument is unambiguous. In this case, the caller will want
199 * diagnose_misspelt_rev == 1 when verifying the first non-rev
200 * argument (which could have been a revision), and
201 * diagnose_misspelt_rev == 0 for the next ones (because we already
202 * saw a filename, there's not ambiguity anymore).
204 void verify_filename(const char *prefix,
205 const char *arg,
206 int diagnose_misspelt_rev)
208 if (*arg == '-')
209 die("bad flag '%s' used after filename", arg);
210 if (check_filename(prefix, arg) || !no_wildcard(arg))
211 return;
212 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
216 * Opposite of the above: the command line did not have -- marker
217 * and we parsed the arg as a refname. It should not be interpretable
218 * as a filename.
220 void verify_non_filename(const char *prefix, const char *arg)
222 if (!is_inside_work_tree() || is_inside_git_dir())
223 return;
224 if (*arg == '-')
225 return; /* flag */
226 if (!check_filename(prefix, arg))
227 return;
228 die(_("ambiguous argument '%s': both revision and filename\n"
229 "Use '--' to separate paths from revisions, like this:\n"
230 "'git <command> [<revision>...] -- [<file>...]'"), arg);
233 int get_common_dir(struct strbuf *sb, const char *gitdir)
235 const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
236 if (git_env_common_dir) {
237 strbuf_addstr(sb, git_env_common_dir);
238 return 1;
239 } else {
240 return get_common_dir_noenv(sb, gitdir);
244 int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)
246 struct strbuf data = STRBUF_INIT;
247 struct strbuf path = STRBUF_INIT;
248 int ret = 0;
250 strbuf_addf(&path, "%s/commondir", gitdir);
251 if (file_exists(path.buf)) {
252 if (strbuf_read_file(&data, path.buf, 0) <= 0)
253 die_errno(_("failed to read %s"), path.buf);
254 while (data.len && (data.buf[data.len - 1] == '\n' ||
255 data.buf[data.len - 1] == '\r'))
256 data.len--;
257 data.buf[data.len] = '\0';
258 strbuf_reset(&path);
259 if (!is_absolute_path(data.buf))
260 strbuf_addf(&path, "%s/", gitdir);
261 strbuf_addbuf(&path, &data);
262 strbuf_add_real_path(sb, path.buf);
263 ret = 1;
264 } else {
265 strbuf_addstr(sb, gitdir);
268 strbuf_release(&data);
269 strbuf_release(&path);
270 return ret;
274 * Test if it looks like we're at a git directory.
275 * We want to see:
277 * - either an objects/ directory _or_ the proper
278 * GIT_OBJECT_DIRECTORY environment variable
279 * - a refs/ directory
280 * - either a HEAD symlink or a HEAD file that is formatted as
281 * a proper "ref:", or a regular file HEAD that has a properly
282 * formatted sha1 object name.
284 int is_git_directory(const char *suspect)
286 struct strbuf path = STRBUF_INIT;
287 int ret = 0;
288 size_t len;
290 /* Check worktree-related signatures */
291 strbuf_addf(&path, "%s/HEAD", suspect);
292 if (validate_headref(path.buf))
293 goto done;
295 strbuf_reset(&path);
296 get_common_dir(&path, suspect);
297 len = path.len;
299 /* Check non-worktree-related signatures */
300 if (getenv(DB_ENVIRONMENT)) {
301 if (access(getenv(DB_ENVIRONMENT), X_OK))
302 goto done;
304 else {
305 strbuf_setlen(&path, len);
306 strbuf_addstr(&path, "/objects");
307 if (access(path.buf, X_OK))
308 goto done;
311 strbuf_setlen(&path, len);
312 strbuf_addstr(&path, "/refs");
313 if (access(path.buf, X_OK))
314 goto done;
316 ret = 1;
317 done:
318 strbuf_release(&path);
319 return ret;
322 int is_nonbare_repository_dir(struct strbuf *path)
324 int ret = 0;
325 int gitfile_error;
326 size_t orig_path_len = path->len;
327 assert(orig_path_len != 0);
328 strbuf_complete(path, '/');
329 strbuf_addstr(path, ".git");
330 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
331 ret = 1;
332 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
333 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
334 ret = 1;
335 strbuf_setlen(path, orig_path_len);
336 return ret;
339 int is_inside_git_dir(void)
341 if (inside_git_dir < 0)
342 inside_git_dir = is_inside_dir(get_git_dir());
343 return inside_git_dir;
346 int is_inside_work_tree(void)
348 if (inside_work_tree < 0)
349 inside_work_tree = is_inside_dir(get_git_work_tree());
350 return inside_work_tree;
353 void setup_work_tree(void)
355 const char *work_tree, *git_dir;
356 static int initialized = 0;
358 if (initialized)
359 return;
361 if (work_tree_config_is_bogus)
362 die("unable to set up work tree using invalid config");
364 work_tree = get_git_work_tree();
365 git_dir = get_git_dir();
366 if (!is_absolute_path(git_dir))
367 git_dir = real_path(get_git_dir());
368 if (!work_tree || chdir(work_tree))
369 die("This operation must be run in a work tree");
372 * Make sure subsequent git processes find correct worktree
373 * if $GIT_WORK_TREE is set relative
375 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
376 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
378 set_git_dir(remove_leading_path(git_dir, work_tree));
379 initialized = 1;
382 static int check_repo_format(const char *var, const char *value, void *vdata)
384 struct repository_format *data = vdata;
385 const char *ext;
387 if (strcmp(var, "core.repositoryformatversion") == 0)
388 data->version = git_config_int(var, value);
389 else if (skip_prefix(var, "extensions.", &ext)) {
391 * record any known extensions here; otherwise,
392 * we fall through to recording it as unknown, and
393 * check_repository_format will complain
395 if (!strcmp(ext, "noop"))
397 else if (!strcmp(ext, "preciousobjects"))
398 data->precious_objects = git_config_bool(var, value);
399 else
400 string_list_append(&data->unknown_extensions, ext);
401 } else if (strcmp(var, "core.bare") == 0) {
402 data->is_bare = git_config_bool(var, value);
403 } else if (strcmp(var, "core.worktree") == 0) {
404 if (!value)
405 return config_error_nonbool(var);
406 data->work_tree = xstrdup(value);
408 return 0;
411 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
413 struct strbuf sb = STRBUF_INIT;
414 struct strbuf err = STRBUF_INIT;
415 struct repository_format candidate;
416 int has_common;
418 has_common = get_common_dir(&sb, gitdir);
419 strbuf_addstr(&sb, "/config");
420 read_repository_format(&candidate, sb.buf);
421 strbuf_release(&sb);
424 * For historical use of check_repository_format() in git-init,
425 * we treat a missing config as a silent "ok", even when nongit_ok
426 * is unset.
428 if (candidate.version < 0)
429 return 0;
431 if (verify_repository_format(&candidate, &err) < 0) {
432 if (nongit_ok) {
433 warning("%s", err.buf);
434 strbuf_release(&err);
435 *nongit_ok = -1;
436 return -1;
438 die("%s", err.buf);
441 repository_format_precious_objects = candidate.precious_objects;
442 string_list_clear(&candidate.unknown_extensions, 0);
443 if (!has_common) {
444 if (candidate.is_bare != -1) {
445 is_bare_repository_cfg = candidate.is_bare;
446 if (is_bare_repository_cfg == 1)
447 inside_work_tree = -1;
449 if (candidate.work_tree) {
450 free(git_work_tree_cfg);
451 git_work_tree_cfg = candidate.work_tree;
452 inside_work_tree = -1;
454 } else {
455 free(candidate.work_tree);
458 return 0;
461 int read_repository_format(struct repository_format *format, const char *path)
463 memset(format, 0, sizeof(*format));
464 format->version = -1;
465 format->is_bare = -1;
466 string_list_init(&format->unknown_extensions, 1);
467 git_config_from_file(check_repo_format, path, format);
468 return format->version;
471 int verify_repository_format(const struct repository_format *format,
472 struct strbuf *err)
474 if (GIT_REPO_VERSION_READ < format->version) {
475 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
476 GIT_REPO_VERSION_READ, format->version);
477 return -1;
480 if (format->version >= 1 && format->unknown_extensions.nr) {
481 int i;
483 strbuf_addstr(err, _("unknown repository extensions found:"));
485 for (i = 0; i < format->unknown_extensions.nr; i++)
486 strbuf_addf(err, "\n\t%s",
487 format->unknown_extensions.items[i].string);
488 return -1;
491 return 0;
494 void read_gitfile_error_die(int error_code, const char *path, const char *dir)
496 switch (error_code) {
497 case READ_GITFILE_ERR_STAT_FAILED:
498 case READ_GITFILE_ERR_NOT_A_FILE:
499 /* non-fatal; follow return path */
500 break;
501 case READ_GITFILE_ERR_OPEN_FAILED:
502 die_errno("Error opening '%s'", path);
503 case READ_GITFILE_ERR_TOO_LARGE:
504 die("Too large to be a .git file: '%s'", path);
505 case READ_GITFILE_ERR_READ_FAILED:
506 die("Error reading %s", path);
507 case READ_GITFILE_ERR_INVALID_FORMAT:
508 die("Invalid gitfile format: %s", path);
509 case READ_GITFILE_ERR_NO_PATH:
510 die("No path in gitfile: %s", path);
511 case READ_GITFILE_ERR_NOT_A_REPO:
512 die("Not a git repository: %s", dir);
513 default:
514 die("BUG: unknown error code");
519 * Try to read the location of the git directory from the .git file,
520 * return path to git directory if found.
522 * On failure, if return_error_code is not NULL, return_error_code
523 * will be set to an error code and NULL will be returned. If
524 * return_error_code is NULL the function will die instead (for most
525 * cases).
527 const char *read_gitfile_gently(const char *path, int *return_error_code)
529 const int max_file_size = 1 << 20; /* 1MB */
530 int error_code = 0;
531 char *buf = NULL;
532 char *dir = NULL;
533 const char *slash;
534 struct stat st;
535 int fd;
536 ssize_t len;
538 if (stat(path, &st)) {
539 /* NEEDSWORK: discern between ENOENT vs other errors */
540 error_code = READ_GITFILE_ERR_STAT_FAILED;
541 goto cleanup_return;
543 if (!S_ISREG(st.st_mode)) {
544 error_code = READ_GITFILE_ERR_NOT_A_FILE;
545 goto cleanup_return;
547 if (st.st_size > max_file_size) {
548 error_code = READ_GITFILE_ERR_TOO_LARGE;
549 goto cleanup_return;
551 fd = open(path, O_RDONLY);
552 if (fd < 0) {
553 error_code = READ_GITFILE_ERR_OPEN_FAILED;
554 goto cleanup_return;
556 buf = xmallocz(st.st_size);
557 len = read_in_full(fd, buf, st.st_size);
558 close(fd);
559 if (len != st.st_size) {
560 error_code = READ_GITFILE_ERR_READ_FAILED;
561 goto cleanup_return;
563 if (!starts_with(buf, "gitdir: ")) {
564 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
565 goto cleanup_return;
567 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
568 len--;
569 if (len < 9) {
570 error_code = READ_GITFILE_ERR_NO_PATH;
571 goto cleanup_return;
573 buf[len] = '\0';
574 dir = buf + 8;
576 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
577 size_t pathlen = slash+1 - path;
578 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
579 (int)(len - 8), buf + 8);
580 free(buf);
581 buf = dir;
583 if (!is_git_directory(dir)) {
584 error_code = READ_GITFILE_ERR_NOT_A_REPO;
585 goto cleanup_return;
587 path = real_path(dir);
589 cleanup_return:
590 if (return_error_code)
591 *return_error_code = error_code;
592 else if (error_code)
593 read_gitfile_error_die(error_code, path, dir);
595 free(buf);
596 return error_code ? NULL : path;
599 static const char *setup_explicit_git_dir(const char *gitdirenv,
600 struct strbuf *cwd,
601 int *nongit_ok)
603 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
604 const char *worktree;
605 char *gitfile;
606 int offset;
608 if (PATH_MAX - 40 < strlen(gitdirenv))
609 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
611 gitfile = (char*)read_gitfile(gitdirenv);
612 if (gitfile) {
613 gitfile = xstrdup(gitfile);
614 gitdirenv = gitfile;
617 if (!is_git_directory(gitdirenv)) {
618 if (nongit_ok) {
619 *nongit_ok = 1;
620 free(gitfile);
621 return NULL;
623 die("Not a git repository: '%s'", gitdirenv);
626 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
627 free(gitfile);
628 return NULL;
631 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
632 if (work_tree_env)
633 set_git_work_tree(work_tree_env);
634 else if (is_bare_repository_cfg > 0) {
635 if (git_work_tree_cfg) {
636 /* #22.2, #30 */
637 warning("core.bare and core.worktree do not make sense");
638 work_tree_config_is_bogus = 1;
641 /* #18, #26 */
642 set_git_dir(gitdirenv);
643 free(gitfile);
644 return NULL;
646 else if (git_work_tree_cfg) { /* #6, #14 */
647 if (is_absolute_path(git_work_tree_cfg))
648 set_git_work_tree(git_work_tree_cfg);
649 else {
650 char *core_worktree;
651 if (chdir(gitdirenv))
652 die_errno("Could not chdir to '%s'", gitdirenv);
653 if (chdir(git_work_tree_cfg))
654 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
655 core_worktree = xgetcwd();
656 if (chdir(cwd->buf))
657 die_errno("Could not come back to cwd");
658 set_git_work_tree(core_worktree);
659 free(core_worktree);
662 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
663 /* #16d */
664 set_git_dir(gitdirenv);
665 free(gitfile);
666 return NULL;
668 else /* #2, #10 */
669 set_git_work_tree(".");
671 /* set_git_work_tree() must have been called by now */
672 worktree = get_git_work_tree();
674 /* both get_git_work_tree() and cwd are already normalized */
675 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
676 set_git_dir(gitdirenv);
677 free(gitfile);
678 return NULL;
681 offset = dir_inside_of(cwd->buf, worktree);
682 if (offset >= 0) { /* cwd inside worktree? */
683 set_git_dir(real_path(gitdirenv));
684 if (chdir(worktree))
685 die_errno("Could not chdir to '%s'", worktree);
686 strbuf_addch(cwd, '/');
687 free(gitfile);
688 return cwd->buf + offset;
691 /* cwd outside worktree */
692 set_git_dir(gitdirenv);
693 free(gitfile);
694 return NULL;
697 static const char *setup_discovered_git_dir(const char *gitdir,
698 struct strbuf *cwd, int offset,
699 int *nongit_ok)
701 if (check_repository_format_gently(gitdir, nongit_ok))
702 return NULL;
704 /* --work-tree is set without --git-dir; use discovered one */
705 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
706 char *to_free = NULL;
707 const char *ret;
709 if (offset != cwd->len && !is_absolute_path(gitdir))
710 gitdir = to_free = real_pathdup(gitdir, 1);
711 if (chdir(cwd->buf))
712 die_errno("Could not come back to cwd");
713 ret = setup_explicit_git_dir(gitdir, cwd, nongit_ok);
714 free(to_free);
715 return ret;
718 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
719 if (is_bare_repository_cfg > 0) {
720 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
721 if (chdir(cwd->buf))
722 die_errno("Could not come back to cwd");
723 return NULL;
726 /* #0, #1, #5, #8, #9, #12, #13 */
727 set_git_work_tree(".");
728 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
729 set_git_dir(gitdir);
730 inside_git_dir = 0;
731 inside_work_tree = 1;
732 if (offset == cwd->len)
733 return NULL;
735 /* Make "offset" point past the '/' (already the case for root dirs) */
736 if (offset != offset_1st_component(cwd->buf))
737 offset++;
738 /* Add a '/' at the end */
739 strbuf_addch(cwd, '/');
740 return cwd->buf + offset;
743 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
744 static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
745 int *nongit_ok)
747 int root_len;
749 if (check_repository_format_gently(".", nongit_ok))
750 return NULL;
752 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
754 /* --work-tree is set without --git-dir; use discovered one */
755 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
756 static const char *gitdir;
758 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
759 if (chdir(cwd->buf))
760 die_errno("Could not come back to cwd");
761 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
764 inside_git_dir = 1;
765 inside_work_tree = 0;
766 if (offset != cwd->len) {
767 if (chdir(cwd->buf))
768 die_errno("Cannot come back to cwd");
769 root_len = offset_1st_component(cwd->buf);
770 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
771 set_git_dir(cwd->buf);
773 else
774 set_git_dir(".");
775 return NULL;
778 static const char *setup_nongit(const char *cwd, int *nongit_ok)
780 if (!nongit_ok)
781 die(_("Not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
782 if (chdir(cwd))
783 die_errno(_("Cannot come back to cwd"));
784 *nongit_ok = 1;
785 return NULL;
788 static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
790 struct stat buf;
791 if (stat(path, &buf)) {
792 die_errno("failed to stat '%*s%s%s'",
793 prefix_len,
794 prefix ? prefix : "",
795 prefix ? "/" : "", path);
797 return buf.st_dev;
801 * A "string_list_each_func_t" function that canonicalizes an entry
802 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
803 * discards it if unusable. The presence of an empty entry in
804 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
805 * subsequent entries.
807 static int canonicalize_ceiling_entry(struct string_list_item *item,
808 void *cb_data)
810 int *empty_entry_found = cb_data;
811 char *ceil = item->string;
813 if (!*ceil) {
814 *empty_entry_found = 1;
815 return 0;
816 } else if (!is_absolute_path(ceil)) {
817 return 0;
818 } else if (*empty_entry_found) {
819 /* Keep entry but do not canonicalize it */
820 return 1;
821 } else {
822 char *real_path = real_pathdup(ceil, 0);
823 if (!real_path) {
824 return 0;
826 free(item->string);
827 item->string = real_path;
828 return 1;
832 enum discovery_result {
833 GIT_DIR_NONE = 0,
834 GIT_DIR_EXPLICIT,
835 GIT_DIR_DISCOVERED,
836 GIT_DIR_BARE,
837 /* these are errors */
838 GIT_DIR_HIT_CEILING = -1,
839 GIT_DIR_HIT_MOUNT_POINT = -2,
840 GIT_DIR_INVALID_GITFILE = -3
844 * We cannot decide in this function whether we are in the work tree or
845 * not, since the config can only be read _after_ this function was called.
847 * Also, we avoid changing any global state (such as the current working
848 * directory) to allow early callers.
850 * The directory where the search should start needs to be passed in via the
851 * `dir` parameter; upon return, the `dir` buffer will contain the path of
852 * the directory where the search ended, and `gitdir` will contain the path of
853 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it
854 * is relative to `dir` (i.e. *not* necessarily the cwd).
856 static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
857 struct strbuf *gitdir,
858 int die_on_error)
860 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
861 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
862 const char *gitdirenv;
863 int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1;
864 dev_t current_device = 0;
865 int one_filesystem = 1;
868 * If GIT_DIR is set explicitly, we're not going
869 * to do any discovery, but we still do repository
870 * validation.
872 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
873 if (gitdirenv) {
874 strbuf_addstr(gitdir, gitdirenv);
875 return GIT_DIR_EXPLICIT;
878 if (env_ceiling_dirs) {
879 int empty_entry_found = 0;
881 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
882 filter_string_list(&ceiling_dirs, 0,
883 canonicalize_ceiling_entry, &empty_entry_found);
884 ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs);
885 string_list_clear(&ceiling_dirs, 0);
888 if (ceil_offset < 0)
889 ceil_offset = min_offset - 2;
892 * Test in the following order (relative to the dir):
893 * - .git (file containing "gitdir: <path>")
894 * - .git/
895 * - ./ (bare)
896 * - ../.git
897 * - ../.git/
898 * - ../ (bare)
899 * - ../../.git/
900 * etc.
902 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
903 if (one_filesystem)
904 current_device = get_device_or_die(dir->buf, NULL, 0);
905 for (;;) {
906 int offset = dir->len, error_code = 0;
908 if (offset > min_offset)
909 strbuf_addch(dir, '/');
910 strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
911 gitdirenv = read_gitfile_gently(dir->buf, die_on_error ?
912 NULL : &error_code);
913 if (!gitdirenv) {
914 if (die_on_error ||
915 error_code == READ_GITFILE_ERR_NOT_A_FILE) {
916 /* NEEDSWORK: fail if .git is not file nor dir */
917 if (is_git_directory(dir->buf))
918 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
919 } else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
920 return GIT_DIR_INVALID_GITFILE;
922 strbuf_setlen(dir, offset);
923 if (gitdirenv) {
924 strbuf_addstr(gitdir, gitdirenv);
925 return GIT_DIR_DISCOVERED;
928 if (is_git_directory(dir->buf)) {
929 strbuf_addstr(gitdir, ".");
930 return GIT_DIR_BARE;
933 if (offset <= min_offset)
934 return GIT_DIR_HIT_CEILING;
936 while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset]))
937 ; /* continue */
938 if (offset <= ceil_offset)
939 return GIT_DIR_HIT_CEILING;
941 strbuf_setlen(dir, offset > min_offset ? offset : min_offset);
942 if (one_filesystem &&
943 current_device != get_device_or_die(dir->buf, NULL, offset))
944 return GIT_DIR_HIT_MOUNT_POINT;
948 const char *discover_git_directory(struct strbuf *gitdir)
950 struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
951 size_t gitdir_offset = gitdir->len, cwd_len;
952 struct repository_format candidate;
954 if (strbuf_getcwd(&dir))
955 return NULL;
957 cwd_len = dir.len;
958 if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) {
959 strbuf_release(&dir);
960 return NULL;
964 * The returned gitdir is relative to dir, and if dir does not reflect
965 * the current working directory, we simply make the gitdir absolute.
967 if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) {
968 /* Avoid a trailing "/." */
969 if (!strcmp(".", gitdir->buf + gitdir_offset))
970 strbuf_setlen(gitdir, gitdir_offset);
971 else
972 strbuf_addch(&dir, '/');
973 strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
976 strbuf_reset(&dir);
977 strbuf_addf(&dir, "%s/config", gitdir->buf + gitdir_offset);
978 read_repository_format(&candidate, dir.buf);
979 strbuf_release(&dir);
981 if (verify_repository_format(&candidate, &err) < 0) {
982 warning("ignoring git dir '%s': %s",
983 gitdir->buf + gitdir_offset, err.buf);
984 strbuf_release(&err);
985 return NULL;
988 return gitdir->buf + gitdir_offset;
991 const char *setup_git_directory_gently(int *nongit_ok)
993 static struct strbuf cwd = STRBUF_INIT;
994 struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
995 const char *prefix, *env_prefix;
998 * We may have read an incomplete configuration before
999 * setting-up the git directory. If so, clear the cache so
1000 * that the next queries to the configuration reload complete
1001 * configuration (including the per-repo config file that we
1002 * ignored previously).
1004 git_config_clear();
1007 * Let's assume that we are in a git repository.
1008 * If it turns out later that we are somewhere else, the value will be
1009 * updated accordingly.
1011 if (nongit_ok)
1012 *nongit_ok = 0;
1014 if (strbuf_getcwd(&cwd))
1015 die_errno(_("Unable to read current working directory"));
1016 strbuf_addbuf(&dir, &cwd);
1018 switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) {
1019 case GIT_DIR_NONE:
1020 prefix = NULL;
1021 break;
1022 case GIT_DIR_EXPLICIT:
1023 prefix = setup_explicit_git_dir(gitdir.buf, &cwd, nongit_ok);
1024 break;
1025 case GIT_DIR_DISCOVERED:
1026 if (dir.len < cwd.len && chdir(dir.buf))
1027 die(_("Cannot change to '%s'"), dir.buf);
1028 prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
1029 nongit_ok);
1030 break;
1031 case GIT_DIR_BARE:
1032 if (dir.len < cwd.len && chdir(dir.buf))
1033 die(_("Cannot change to '%s'"), dir.buf);
1034 prefix = setup_bare_git_dir(&cwd, dir.len, nongit_ok);
1035 break;
1036 case GIT_DIR_HIT_CEILING:
1037 prefix = setup_nongit(cwd.buf, nongit_ok);
1038 break;
1039 case GIT_DIR_HIT_MOUNT_POINT:
1040 if (nongit_ok) {
1041 *nongit_ok = 1;
1042 strbuf_release(&cwd);
1043 strbuf_release(&dir);
1044 return NULL;
1046 die(_("Not a git repository (or any parent up to mount point %s)\n"
1047 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
1048 dir.buf);
1049 default:
1050 die("BUG: unhandled setup_git_directory_1() result");
1053 env_prefix = getenv(GIT_TOPLEVEL_PREFIX_ENVIRONMENT);
1054 if (env_prefix)
1055 prefix = env_prefix;
1057 if (prefix)
1058 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1059 else
1060 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1062 startup_info->have_repository = !nongit_ok || !*nongit_ok;
1063 startup_info->prefix = prefix;
1065 strbuf_release(&dir);
1066 strbuf_release(&gitdir);
1068 return prefix;
1071 int git_config_perm(const char *var, const char *value)
1073 int i;
1074 char *endptr;
1076 if (value == NULL)
1077 return PERM_GROUP;
1079 if (!strcmp(value, "umask"))
1080 return PERM_UMASK;
1081 if (!strcmp(value, "group"))
1082 return PERM_GROUP;
1083 if (!strcmp(value, "all") ||
1084 !strcmp(value, "world") ||
1085 !strcmp(value, "everybody"))
1086 return PERM_EVERYBODY;
1088 /* Parse octal numbers */
1089 i = strtol(value, &endptr, 8);
1091 /* If not an octal number, maybe true/false? */
1092 if (*endptr != 0)
1093 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
1096 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
1097 * a chmod value to restrict to.
1099 switch (i) {
1100 case PERM_UMASK: /* 0 */
1101 return PERM_UMASK;
1102 case OLD_PERM_GROUP: /* 1 */
1103 return PERM_GROUP;
1104 case OLD_PERM_EVERYBODY: /* 2 */
1105 return PERM_EVERYBODY;
1108 /* A filemode value was given: 0xxx */
1110 if ((i & 0600) != 0600)
1111 die(_("Problem with core.sharedRepository filemode value "
1112 "(0%.3o).\nThe owner of files must always have "
1113 "read and write permissions."), i);
1116 * Mask filemode value. Others can not get write permission.
1117 * x flags for directories are handled separately.
1119 return -(i & 0666);
1122 void check_repository_format(void)
1124 check_repository_format_gently(get_git_dir(), NULL);
1125 startup_info->have_repository = 1;
1129 * Returns the "prefix", a path to the current working directory
1130 * relative to the work tree root, or NULL, if the current working
1131 * directory is not a strict subdirectory of the work tree root. The
1132 * prefix always ends with a '/' character.
1134 const char *setup_git_directory(void)
1136 return setup_git_directory_gently(NULL);
1139 const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
1141 if (is_git_directory(suspect))
1142 return suspect;
1143 return read_gitfile_gently(suspect, return_error_code);
1146 /* if any standard file descriptor is missing open it to /dev/null */
1147 void sanitize_stdfds(void)
1149 int fd = open("/dev/null", O_RDWR, 0);
1150 while (fd != -1 && fd < 2)
1151 fd = dup(fd);
1152 if (fd == -1)
1153 die_errno("open /dev/null or dup failed");
1154 if (fd > 2)
1155 close(fd);
1158 int daemonize(void)
1160 #ifdef NO_POSIX_GOODIES
1161 errno = ENOSYS;
1162 return -1;
1163 #else
1164 switch (fork()) {
1165 case 0:
1166 break;
1167 case -1:
1168 die_errno("fork failed");
1169 default:
1170 exit(0);
1172 if (setsid() == -1)
1173 die_errno("setsid failed");
1174 close(0);
1175 close(1);
1176 close(2);
1177 sanitize_stdfds();
1178 return 0;
1179 #endif