MSVC: fix poll-related macro redefines
[git/dscho.git] / setup.c
blob7a3618fab774c0c26a99c6e23b4fcf726e5dc1ad
1 #include "cache.h"
2 #include "dir.h"
4 static int inside_git_dir = -1;
5 static int inside_work_tree = -1;
7 char *prefix_path(const char *prefix, int len, const char *path)
9 const char *orig = path;
10 char *sanitized;
11 if (is_absolute_path(orig)) {
12 const char *temp = real_path(path);
13 sanitized = xmalloc(len + strlen(temp) + 1);
14 strcpy(sanitized, temp);
15 } else {
16 sanitized = xmalloc(len + strlen(path) + 1);
17 if (len)
18 memcpy(sanitized, prefix, len);
19 strcpy(sanitized + len, path);
21 if (normalize_path_copy(sanitized, sanitized))
22 goto error_out;
23 if (is_absolute_path(orig)) {
24 size_t root_len, len, total;
25 const char *work_tree = get_git_work_tree();
26 if (!work_tree)
27 goto error_out;
28 len = strlen(work_tree);
29 root_len = offset_1st_component(work_tree);
30 total = strlen(sanitized) + 1;
31 if (strncmp(sanitized, work_tree, len) ||
32 (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
33 error_out:
34 die("'%s' is outside repository", orig);
36 if (sanitized[len] == '/')
37 len++;
38 memmove(sanitized, sanitized + len, total - len);
40 return sanitized;
43 int check_filename(const char *prefix, const char *arg)
45 const char *name;
46 struct stat st;
48 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
49 if (!lstat(name, &st))
50 return 1; /* file exists */
51 if (errno == ENOENT || errno == ENOTDIR)
52 return 0; /* file does not exist */
53 die_errno("failed to stat '%s'", arg);
56 static void NORETURN die_verify_filename(const char *prefix, const char *arg)
58 unsigned char sha1[20];
59 unsigned mode;
62 * Saying "'(icase)foo' does not exist in the index" when the
63 * user gave us ":(icase)foo" is just stupid. A magic pathspec
64 * begins with a colon and is followed by a non-alnum; do not
65 * let get_sha1_with_mode_1(only_to_die=1) to even trigger.
67 if (!(arg[0] == ':' && !isalnum(arg[1])))
68 /* try a detailed diagnostic ... */
69 get_sha1_with_mode_1(arg, sha1, &mode, 1, prefix);
71 /* ... or fall back the most general message. */
72 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
73 "Use '--' to separate paths from revisions", arg);
78 * Verify a filename that we got as an argument for a pathspec
79 * entry. Note that a filename that begins with "-" never verifies
80 * as true, because even if such a filename were to exist, we want
81 * it to be preceded by the "--" marker (or we want the user to
82 * use a format like "./-filename")
84 void verify_filename(const char *prefix, const char *arg)
86 if (*arg == '-')
87 die("bad flag '%s' used after filename", arg);
88 if (check_filename(prefix, arg))
89 return;
90 die_verify_filename(prefix, arg);
94 * Opposite of the above: the command line did not have -- marker
95 * and we parsed the arg as a refname. It should not be interpretable
96 * as a filename.
98 void verify_non_filename(const char *prefix, const char *arg)
100 if (!is_inside_work_tree() || is_inside_git_dir())
101 return;
102 if (*arg == '-')
103 return; /* flag */
104 if (!check_filename(prefix, arg))
105 return;
106 die("ambiguous argument '%s': both revision and filename\n"
107 "Use '--' to separate filenames from revisions", arg);
111 * Magic pathspec
113 * NEEDSWORK: These need to be moved to dir.h or even to a new
114 * pathspec.h when we restructure get_pathspec() users to use the
115 * "struct pathspec" interface.
117 * Possible future magic semantics include stuff like:
119 * { PATHSPEC_NOGLOB, '!', "noglob" },
120 * { PATHSPEC_ICASE, '\0', "icase" },
121 * { PATHSPEC_RECURSIVE, '*', "recursive" },
122 * { PATHSPEC_REGEXP, '\0', "regexp" },
125 #define PATHSPEC_FROMTOP (1<<0)
127 static struct pathspec_magic {
128 unsigned bit;
129 char mnemonic; /* this cannot be ':'! */
130 const char *name;
131 } pathspec_magic[] = {
132 { PATHSPEC_FROMTOP, '/', "top" },
136 * Take an element of a pathspec and check for magic signatures.
137 * Append the result to the prefix.
139 * For now, we only parse the syntax and throw out anything other than
140 * "top" magic.
142 * NEEDSWORK: This needs to be rewritten when we start migrating
143 * get_pathspec() users to use the "struct pathspec" interface. For
144 * example, a pathspec element may be marked as case-insensitive, but
145 * the prefix part must always match literally, and a single stupid
146 * string cannot express such a case.
148 static const char *prefix_pathspec(const char *prefix, int prefixlen, const char *elt)
150 unsigned magic = 0;
151 const char *copyfrom = elt;
152 int i;
154 if (elt[0] != ':') {
155 ; /* nothing to do */
156 } else if (elt[1] == '(') {
157 /* longhand */
158 const char *nextat;
159 for (copyfrom = elt + 2;
160 *copyfrom && *copyfrom != ')';
161 copyfrom = nextat) {
162 size_t len = strcspn(copyfrom, ",)");
163 if (copyfrom[len] == ')')
164 nextat = copyfrom + len;
165 else
166 nextat = copyfrom + len + 1;
167 if (!len)
168 continue;
169 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
170 if (strlen(pathspec_magic[i].name) == len &&
171 !strncmp(pathspec_magic[i].name, copyfrom, len)) {
172 magic |= pathspec_magic[i].bit;
173 break;
175 if (ARRAY_SIZE(pathspec_magic) <= i)
176 die("Invalid pathspec magic '%.*s' in '%s'",
177 (int) len, copyfrom, elt);
179 if (*copyfrom == ')')
180 copyfrom++;
181 } else {
182 /* shorthand */
183 for (copyfrom = elt + 1;
184 *copyfrom && *copyfrom != ':';
185 copyfrom++) {
186 char ch = *copyfrom;
188 if (!is_pathspec_magic(ch))
189 break;
190 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
191 if (pathspec_magic[i].mnemonic == ch) {
192 magic |= pathspec_magic[i].bit;
193 break;
195 if (ARRAY_SIZE(pathspec_magic) <= i)
196 die("Unimplemented pathspec magic '%c' in '%s'",
197 ch, elt);
199 if (*copyfrom == ':')
200 copyfrom++;
203 if (magic & PATHSPEC_FROMTOP)
204 return xstrdup(copyfrom);
205 else
206 return prefix_path(prefix, prefixlen, copyfrom);
209 const char **get_pathspec(const char *prefix, const char **pathspec)
211 const char *entry = *pathspec;
212 const char **src, **dst;
213 int prefixlen;
215 if (!prefix && !entry)
216 return NULL;
218 if (!entry) {
219 static const char *spec[2];
220 spec[0] = prefix;
221 spec[1] = NULL;
222 return spec;
225 /* Otherwise we have to re-write the entries.. */
226 src = pathspec;
227 dst = pathspec;
228 prefixlen = prefix ? strlen(prefix) : 0;
229 while (*src) {
230 *(dst++) = prefix_pathspec(prefix, prefixlen, *src);
231 src++;
233 *dst = NULL;
234 if (!*pathspec)
235 return NULL;
236 return pathspec;
240 * Test if it looks like we're at a git directory.
241 * We want to see:
243 * - either an objects/ directory _or_ the proper
244 * GIT_OBJECT_DIRECTORY environment variable
245 * - a refs/ directory
246 * - either a HEAD symlink or a HEAD file that is formatted as
247 * a proper "ref:", or a regular file HEAD that has a properly
248 * formatted sha1 object name.
250 int is_git_directory(const char *suspect)
252 char path[PATH_MAX];
253 size_t len = strlen(suspect);
255 if (PATH_MAX <= len + strlen("/objects"))
256 die("Too long path: %.*s", 60, suspect);
257 strcpy(path, suspect);
258 if (getenv(DB_ENVIRONMENT)) {
259 if (access(getenv(DB_ENVIRONMENT), X_OK))
260 return 0;
262 else {
263 strcpy(path + len, "/objects");
264 if (access(path, X_OK))
265 return 0;
268 strcpy(path + len, "/refs");
269 if (access(path, X_OK))
270 return 0;
272 strcpy(path + len, "/HEAD");
273 if (validate_headref(path))
274 return 0;
276 return 1;
279 int is_inside_git_dir(void)
281 if (inside_git_dir < 0)
282 inside_git_dir = is_inside_dir(get_git_dir());
283 return inside_git_dir;
286 int is_inside_work_tree(void)
288 if (inside_work_tree < 0)
289 inside_work_tree = is_inside_dir(get_git_work_tree());
290 return inside_work_tree;
293 void setup_work_tree(void)
295 const char *work_tree, *git_dir;
296 static int initialized = 0;
298 if (initialized)
299 return;
300 work_tree = get_git_work_tree();
301 git_dir = get_git_dir();
302 if (!is_absolute_path(git_dir))
303 git_dir = real_path(get_git_dir());
304 if (!work_tree || chdir(work_tree))
305 die("This operation must be run in a work tree");
308 * Make sure subsequent git processes find correct worktree
309 * if $GIT_WORK_TREE is set relative
311 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
312 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
314 set_git_dir(relative_path(git_dir, work_tree));
315 initialized = 1;
318 static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
320 char repo_config[PATH_MAX+1];
323 * git_config() can't be used here because it calls git_pathdup()
324 * to get $GIT_CONFIG/config. That call will make setup_git_env()
325 * set git_dir to ".git".
327 * We are in gitdir setup, no git dir has been found useable yet.
328 * Use a gentler version of git_config() to check if this repo
329 * is a good one.
331 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
332 git_config_early(check_repository_format_version, NULL, repo_config);
333 if (GIT_REPO_VERSION < repository_format_version) {
334 if (!nongit_ok)
335 die ("Expected git repo version <= %d, found %d",
336 GIT_REPO_VERSION, repository_format_version);
337 warning("Expected git repo version <= %d, found %d",
338 GIT_REPO_VERSION, repository_format_version);
339 warning("Please upgrade Git");
340 *nongit_ok = -1;
341 return -1;
343 return 0;
347 * Try to read the location of the git directory from the .git file,
348 * return path to git directory if found.
350 const char *read_gitfile(const char *path)
352 char *buf;
353 char *dir;
354 const char *slash;
355 struct stat st;
356 int fd;
357 ssize_t len;
359 if (stat(path, &st))
360 return NULL;
361 if (!S_ISREG(st.st_mode))
362 return NULL;
363 fd = open(path, O_RDONLY);
364 if (fd < 0)
365 die_errno("Error opening '%s'", path);
366 buf = xmalloc(st.st_size + 1);
367 len = read_in_full(fd, buf, st.st_size);
368 close(fd);
369 if (len != st.st_size)
370 die("Error reading %s", path);
371 buf[len] = '\0';
372 if (prefixcmp(buf, "gitdir: "))
373 die("Invalid gitfile format: %s", path);
374 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
375 len--;
376 if (len < 9)
377 die("No path in gitfile: %s", path);
378 buf[len] = '\0';
379 dir = buf + 8;
381 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
382 size_t pathlen = slash+1 - path;
383 size_t dirlen = pathlen + len - 8;
384 dir = xmalloc(dirlen + 1);
385 strncpy(dir, path, pathlen);
386 strncpy(dir + pathlen, buf + 8, len - 8);
387 dir[dirlen] = '\0';
388 free(buf);
389 buf = dir;
392 if (!is_git_directory(dir))
393 die("Not a git repository: %s", dir);
394 path = real_path(dir);
396 free(buf);
397 return path;
400 static const char *setup_explicit_git_dir(const char *gitdirenv,
401 char *cwd, int len,
402 int *nongit_ok)
404 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
405 const char *worktree;
406 char *gitfile;
407 int offset;
409 if (PATH_MAX - 40 < strlen(gitdirenv))
410 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
412 gitfile = (char*)read_gitfile(gitdirenv);
413 if (gitfile) {
414 gitfile = xstrdup(gitfile);
415 gitdirenv = gitfile;
418 if (!is_git_directory(gitdirenv)) {
419 if (nongit_ok) {
420 *nongit_ok = 1;
421 free(gitfile);
422 return NULL;
424 die("Not a git repository: '%s'", gitdirenv);
427 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
428 free(gitfile);
429 return NULL;
432 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
433 if (work_tree_env)
434 set_git_work_tree(work_tree_env);
435 else if (is_bare_repository_cfg > 0) {
436 if (git_work_tree_cfg) /* #22.2, #30 */
437 die("core.bare and core.worktree do not make sense");
439 /* #18, #26 */
440 set_git_dir(gitdirenv);
441 free(gitfile);
442 return NULL;
444 else if (git_work_tree_cfg) { /* #6, #14 */
445 if (is_absolute_path(git_work_tree_cfg))
446 set_git_work_tree(git_work_tree_cfg);
447 else {
448 char core_worktree[PATH_MAX];
449 if (chdir(gitdirenv))
450 die_errno("Could not chdir to '%s'", gitdirenv);
451 if (chdir(git_work_tree_cfg))
452 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
453 if (!getcwd(core_worktree, PATH_MAX))
454 die_errno("Could not get directory '%s'", git_work_tree_cfg);
455 if (chdir(cwd))
456 die_errno("Could not come back to cwd");
457 set_git_work_tree(core_worktree);
460 else /* #2, #10 */
461 set_git_work_tree(".");
463 /* set_git_work_tree() must have been called by now */
464 worktree = get_git_work_tree();
466 /* both get_git_work_tree() and cwd are already normalized */
467 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
468 set_git_dir(gitdirenv);
469 free(gitfile);
470 return NULL;
473 offset = dir_inside_of(cwd, worktree);
474 if (offset >= 0) { /* cwd inside worktree? */
475 set_git_dir(real_path(gitdirenv));
476 if (chdir(worktree))
477 die_errno("Could not chdir to '%s'", worktree);
478 cwd[len++] = '/';
479 cwd[len] = '\0';
480 free(gitfile);
481 return cwd + offset;
484 /* cwd outside worktree */
485 set_git_dir(gitdirenv);
486 free(gitfile);
487 return NULL;
490 static const char *setup_discovered_git_dir(const char *gitdir,
491 char *cwd, int offset, int len,
492 int *nongit_ok)
494 if (check_repository_format_gently(gitdir, nongit_ok))
495 return NULL;
497 /* --work-tree is set without --git-dir; use discovered one */
498 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
499 if (offset != len && !is_absolute_path(gitdir))
500 gitdir = xstrdup(real_path(gitdir));
501 if (chdir(cwd))
502 die_errno("Could not come back to cwd");
503 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
506 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
507 if (is_bare_repository_cfg > 0) {
508 set_git_dir(offset == len ? gitdir : real_path(gitdir));
509 if (chdir(cwd))
510 die_errno("Could not come back to cwd");
511 return NULL;
514 /* #0, #1, #5, #8, #9, #12, #13 */
515 set_git_work_tree(".");
516 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
517 set_git_dir(gitdir);
518 inside_git_dir = 0;
519 inside_work_tree = 1;
520 if (offset == len)
521 return NULL;
523 /* Make "offset" point to past the '/', and add a '/' at the end */
524 offset++;
525 cwd[len++] = '/';
526 cwd[len] = 0;
527 return cwd + offset;
530 /* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
531 static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
533 int root_len;
535 if (check_repository_format_gently(".", nongit_ok))
536 return NULL;
538 /* --work-tree is set without --git-dir; use discovered one */
539 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
540 const char *gitdir;
542 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
543 if (chdir(cwd))
544 die_errno("Could not come back to cwd");
545 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
548 inside_git_dir = 1;
549 inside_work_tree = 0;
550 if (offset != len) {
551 if (chdir(cwd))
552 die_errno("Cannot come back to cwd");
553 root_len = offset_1st_component(cwd);
554 cwd[offset > root_len ? offset : root_len] = '\0';
555 set_git_dir(cwd);
557 else
558 set_git_dir(".");
559 return NULL;
562 static const char *setup_nongit(const char *cwd, int *nongit_ok)
564 if (!nongit_ok)
565 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
566 if (chdir(cwd))
567 die_errno("Cannot come back to cwd");
568 *nongit_ok = 1;
569 return NULL;
572 static dev_t get_device_or_die(const char *path, const char *prefix)
574 struct stat buf;
575 if (stat(path, &buf))
576 die_errno("failed to stat '%s%s%s'",
577 prefix ? prefix : "",
578 prefix ? "/" : "", path);
579 return buf.st_dev;
583 * We cannot decide in this function whether we are in the work tree or
584 * not, since the config can only be read _after_ this function was called.
586 static const char *setup_git_directory_gently_1(int *nongit_ok)
588 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
589 static char cwd[PATH_MAX+1];
590 const char *gitdirenv, *ret;
591 char *gitfile;
592 int len, offset, ceil_offset;
593 dev_t current_device = 0;
594 int one_filesystem = 1;
597 * Let's assume that we are in a git repository.
598 * If it turns out later that we are somewhere else, the value will be
599 * updated accordingly.
601 if (nongit_ok)
602 *nongit_ok = 0;
604 if (!getcwd(cwd, sizeof(cwd)-1))
605 die_errno("Unable to read current working directory");
606 offset = len = strlen(cwd);
609 * If GIT_DIR is set explicitly, we're not going
610 * to do any discovery, but we still do repository
611 * validation.
613 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
614 if (gitdirenv)
615 return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
617 ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
618 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
619 ceil_offset = 1;
622 * Test in the following order (relative to the cwd):
623 * - .git (file containing "gitdir: <path>")
624 * - .git/
625 * - ./ (bare)
626 * - ../.git
627 * - ../.git/
628 * - ../ (bare)
629 * - ../../.git/
630 * etc.
632 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
633 if (one_filesystem)
634 current_device = get_device_or_die(".", NULL);
635 for (;;) {
636 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
637 if (gitfile)
638 gitdirenv = gitfile = xstrdup(gitfile);
639 else {
640 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
641 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
644 if (gitdirenv) {
645 ret = setup_discovered_git_dir(gitdirenv,
646 cwd, offset, len,
647 nongit_ok);
648 free(gitfile);
649 return ret;
651 free(gitfile);
653 if (is_git_directory("."))
654 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
656 while (--offset > ceil_offset && cwd[offset] != '/');
657 if (offset <= ceil_offset)
658 return setup_nongit(cwd, nongit_ok);
659 if (one_filesystem) {
660 dev_t parent_device = get_device_or_die("..", cwd);
661 if (parent_device != current_device) {
662 if (nongit_ok) {
663 if (chdir(cwd))
664 die_errno("Cannot come back to cwd");
665 *nongit_ok = 1;
666 return NULL;
668 cwd[offset] = '\0';
669 die("Not a git repository (or any parent up to mount parent %s)\n"
670 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
673 if (chdir("..")) {
674 cwd[offset] = '\0';
675 die_errno("Cannot change to '%s/..'", cwd);
680 const char *setup_git_directory_gently(int *nongit_ok)
682 const char *prefix;
684 prefix = setup_git_directory_gently_1(nongit_ok);
685 if (prefix)
686 setenv("GIT_PREFIX", prefix, 1);
687 else
688 setenv("GIT_PREFIX", "", 1);
690 if (startup_info) {
691 startup_info->have_repository = !nongit_ok || !*nongit_ok;
692 startup_info->prefix = prefix;
694 return prefix;
697 int git_config_perm(const char *var, const char *value)
699 int i;
700 char *endptr;
702 if (value == NULL)
703 return PERM_GROUP;
705 if (!strcmp(value, "umask"))
706 return PERM_UMASK;
707 if (!strcmp(value, "group"))
708 return PERM_GROUP;
709 if (!strcmp(value, "all") ||
710 !strcmp(value, "world") ||
711 !strcmp(value, "everybody"))
712 return PERM_EVERYBODY;
714 /* Parse octal numbers */
715 i = strtol(value, &endptr, 8);
717 /* If not an octal number, maybe true/false? */
718 if (*endptr != 0)
719 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
722 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
723 * a chmod value to restrict to.
725 switch (i) {
726 case PERM_UMASK: /* 0 */
727 return PERM_UMASK;
728 case OLD_PERM_GROUP: /* 1 */
729 return PERM_GROUP;
730 case OLD_PERM_EVERYBODY: /* 2 */
731 return PERM_EVERYBODY;
734 /* A filemode value was given: 0xxx */
736 if ((i & 0600) != 0600)
737 die("Problem with core.sharedRepository filemode value "
738 "(0%.3o).\nThe owner of files must always have "
739 "read and write permissions.", i);
742 * Mask filemode value. Others can not get write permission.
743 * x flags for directories are handled separately.
745 return -(i & 0666);
748 int check_repository_format_version(const char *var, const char *value, void *cb)
750 if (strcmp(var, "core.repositoryformatversion") == 0)
751 repository_format_version = git_config_int(var, value);
752 else if (strcmp(var, "core.sharedrepository") == 0)
753 shared_repository = git_config_perm(var, value);
754 else if (strcmp(var, "core.bare") == 0) {
755 is_bare_repository_cfg = git_config_bool(var, value);
756 if (is_bare_repository_cfg == 1)
757 inside_work_tree = -1;
758 } else if (strcmp(var, "core.worktree") == 0) {
759 if (!value)
760 return config_error_nonbool(var);
761 free(git_work_tree_cfg);
762 git_work_tree_cfg = xstrdup(value);
763 inside_work_tree = -1;
765 return 0;
768 int check_repository_format(void)
770 return check_repository_format_gently(get_git_dir(), NULL);
774 * Returns the "prefix", a path to the current working directory
775 * relative to the work tree root, or NULL, if the current working
776 * directory is not a strict subdirectory of the work tree root. The
777 * prefix always ends with a '/' character.
779 const char *setup_git_directory(void)
781 return setup_git_directory_gently(NULL);
784 const char *resolve_gitdir(const char *suspect)
786 if (is_git_directory(suspect))
787 return suspect;
788 return read_gitfile(suspect);