1#include "cache.h"
2#include "dir.h"
3#include "string-list.h"
4static int inside_git_dir = -1;
6static int inside_work_tree = -1;
7static char *prefix_path_gently(const char *prefix, int len, const char *path)
9{
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);
21 }
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;
37 }
38 if (sanitized[len] == '/')
39 len++;
40 memmove(sanitized, sanitized + len, total - len);
41 }
42 return sanitized;
43}
44char *prefix_path(const char *prefix, int len, const char *path)
46{
47 char *r = prefix_path_gently(prefix, len, path);
48 if (!r)
49 die("'%s' is outside repository", path);
50 return r;
51}
52int path_inside_repo(const char *prefix, const char *path)
54{
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;
60 }
61 return 0;
62}
63int check_filename(const char *prefix, const char *arg)
65{
66 const char *name;
67 struct stat st;
68 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
70 if (!lstat(name, &st))
71 return 1; /* file exists */
72 if (errno == ENOENT || errno == ENOTDIR)
73 return 0; /* file does not exist */
74 die_errno("failed to stat '%s'", arg);
75}
76static void NORETURN die_verify_filename(const char *prefix,
78 const char *arg,
79 int diagnose_misspelt_rev)
80{
81 if (!diagnose_misspelt_rev)
82 die("%s: no such path in the working tree.\n"
83 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
84 arg);
85 /*
86 * Saying "'(icase)foo' does not exist in the index" when the
87 * user gave us ":(icase)foo" is just stupid. A magic pathspec
88 * begins with a colon and is followed by a non-alnum; do not
89 * let maybe_die_on_misspelt_object_name() even trigger.
90 */
91 if (!(arg[0] == ':' && !isalnum(arg[1])))
92 maybe_die_on_misspelt_object_name(arg, prefix);
93 /* ... or fall back the most general message. */
95 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
96 "Use '--' to separate paths from revisions, like this:\n"
97 "'git <command> [<revision>...] -- [<file>...]'", arg);
98}
100/*
102 * Verify a filename that we got as an argument for a pathspec
103 * entry. Note that a filename that begins with "-" never verifies
104 * as true, because even if such a filename were to exist, we want
105 * it to be preceded by the "--" marker (or we want the user to
106 * use a format like "./-filename")
107 *
108 * The "diagnose_misspelt_rev" is used to provide a user-friendly
109 * diagnosis when dying upon finding that "name" is not a pathname.
110 * If set to 1, the diagnosis will try to diagnose "name" as an
111 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
112 * will only complain about an inexisting file.
113 *
114 * This function is typically called to check that a "file or rev"
115 * argument is unambiguous. In this case, the caller will want
116 * diagnose_misspelt_rev == 1 when verifying the first non-rev
117 * argument (which could have been a revision), and
118 * diagnose_misspelt_rev == 0 for the next ones (because we already
119 * saw a filename, there's not ambiguity anymore).
120 */
121void verify_filename(const char *prefix,
122 const char *arg,
123 int diagnose_misspelt_rev)
124{
125 if (*arg == '-')
126 die("bad flag '%s' used after filename", arg);
127 if (check_filename(prefix, arg))
128 return;
129 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
130}
131/*
133 * Opposite of the above: the command line did not have -- marker
134 * and we parsed the arg as a refname. It should not be interpretable
135 * as a filename.
136 */
137void verify_non_filename(const char *prefix, const char *arg)
138{
139 if (!is_inside_work_tree() || is_inside_git_dir())
140 return;
141 if (*arg == '-')
142 return; /* flag */
143 if (!check_filename(prefix, arg))
144 return;
145 die("ambiguous argument '%s': both revision and filename\n"
146 "Use '--' to separate paths from revisions, like this:\n"
147 "'git <command> [<revision>...] -- [<file>...]'", arg);
148}
149/*
151 * Magic pathspec
152 *
153 * NEEDSWORK: These need to be moved to dir.h or even to a new
154 * pathspec.h when we restructure get_pathspec() users to use the
155 * "struct pathspec" interface.
156 *
157 * Possible future magic semantics include stuff like:
158 *
159 * { PATHSPEC_NOGLOB, '!', "noglob" },
160 * { PATHSPEC_ICASE, '\0', "icase" },
161 * { PATHSPEC_RECURSIVE, '*', "recursive" },
162 * { PATHSPEC_REGEXP, '\0', "regexp" },
163 *
164 */
165#define PATHSPEC_FROMTOP (1<<0)
166static struct pathspec_magic {
168 unsigned bit;
169 char mnemonic; /* this cannot be ':'! */
170 const char *name;
171} pathspec_magic[] = {
172 { PATHSPEC_FROMTOP, '/', "top" },
173};
174/*
176 * Take an element of a pathspec and check for magic signatures.
177 * Append the result to the prefix.
178 *
179 * For now, we only parse the syntax and throw out anything other than
180 * "top" magic.
181 *
182 * NEEDSWORK: This needs to be rewritten when we start migrating
183 * get_pathspec() users to use the "struct pathspec" interface. For
184 * example, a pathspec element may be marked as case-insensitive, but
185 * the prefix part must always match literally, and a single stupid
186 * string cannot express such a case.
187 */
188static const char *prefix_pathspec(const char *prefix, int prefixlen, const char *elt)
189{
190 unsigned magic = 0;
191 const char *copyfrom = elt;
192 int i;
193 if (elt[0] != ':') {
195 ; /* nothing to do */
196 } else if (elt[1] == '(') {
197 /* longhand */
198 const char *nextat;
199 for (copyfrom = elt + 2;
200 *copyfrom && *copyfrom != ')';
201 copyfrom = nextat) {
202 size_t len = strcspn(copyfrom, ",)");
203 if (copyfrom[len] == ')')
204 nextat = copyfrom + len;
205 else
206 nextat = copyfrom + len + 1;
207 if (!len)
208 continue;
209 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
210 if (strlen(pathspec_magic[i].name) == len &&
211 !strncmp(pathspec_magic[i].name, copyfrom, len)) {
212 magic |= pathspec_magic[i].bit;
213 break;
214 }
215 if (ARRAY_SIZE(pathspec_magic) <= i)
216 die("Invalid pathspec magic '%.*s' in '%s'",
217 (int) len, copyfrom, elt);
218 }
219 if (*copyfrom == ')')
220 copyfrom++;
221 } else {
222 /* shorthand */
223 for (copyfrom = elt + 1;
224 *copyfrom && *copyfrom != ':';
225 copyfrom++) {
226 char ch = *copyfrom;
227 if (!is_pathspec_magic(ch))
229 break;
230 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
231 if (pathspec_magic[i].mnemonic == ch) {
232 magic |= pathspec_magic[i].bit;
233 break;
234 }
235 if (ARRAY_SIZE(pathspec_magic) <= i)
236 die("Unimplemented pathspec magic '%c' in '%s'",
237 ch, elt);
238 }
239 if (*copyfrom == ':')
240 copyfrom++;
241 }
242 if (magic & PATHSPEC_FROMTOP)
244 return xstrdup(copyfrom);
245 else
246 return prefix_path(prefix, prefixlen, copyfrom);
247}
248const char **get_pathspec(const char *prefix, const char **pathspec)
250{
251 const char *entry = *pathspec;
252 const char **src, **dst;
253 int prefixlen;
254 if (!prefix && !entry)
256 return NULL;
257 if (!entry) {
259 static const char *spec[2];
260 spec[0] = prefix;
261 spec[1] = NULL;
262 return spec;
263 }
264 /* Otherwise we have to re-write the entries.. */
266 src = pathspec;
267 dst = pathspec;
268 prefixlen = prefix ? strlen(prefix) : 0;
269 while (*src) {
270 *(dst++) = prefix_pathspec(prefix, prefixlen, *src);
271 src++;
272 }
273 *dst = NULL;
274 if (!*pathspec)
275 return NULL;
276 return pathspec;
277}
278/*
280 * Test if it looks like we're at a git directory.
281 * We want to see:
282 *
283 * - either an objects/ directory _or_ the proper
284 * GIT_OBJECT_DIRECTORY environment variable
285 * - a refs/ directory
286 * - either a HEAD symlink or a HEAD file that is formatted as
287 * a proper "ref:", or a regular file HEAD that has a properly
288 * formatted sha1 object name.
289 */
290int is_git_directory(const char *suspect)
291{
292 char path[PATH_MAX];
293 size_t len = strlen(suspect);
294 if (PATH_MAX <= len + strlen("/objects"))
296 die("Too long path: %.*s", 60, suspect);
297 strcpy(path, suspect);
298 if (getenv(DB_ENVIRONMENT)) {
299 if (access(getenv(DB_ENVIRONMENT), X_OK))
300 return 0;
301 }
302 else {
303 strcpy(path + len, "/objects");
304 if (access(path, X_OK))
305 return 0;
306 }
307 strcpy(path + len, "/refs");
309 if (access(path, X_OK))
310 return 0;
311 strcpy(path + len, "/HEAD");
313 if (validate_headref(path))
314 return 0;
315 return 1;
317}
318int is_inside_git_dir(void)
320{
321 if (inside_git_dir < 0)
322 inside_git_dir = is_inside_dir(get_git_dir());
323 return inside_git_dir;
324}
325int is_inside_work_tree(void)
327{
328 if (inside_work_tree < 0)
329 inside_work_tree = is_inside_dir(get_git_work_tree());
330 return inside_work_tree;
331}
332void setup_work_tree(void)
334{
335 const char *work_tree, *git_dir;
336 static int initialized = 0;
337 if (initialized)
339 return;
340 work_tree = get_git_work_tree();
341 git_dir = get_git_dir();
342 if (!is_absolute_path(git_dir))
343 git_dir = real_path(get_git_dir());
344 if (!work_tree || chdir(work_tree))
345 die("This operation must be run in a work tree");
346 /*
348 * Make sure subsequent git processes find correct worktree
349 * if $GIT_WORK_TREE is set relative
350 */
351 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
352 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
353 set_git_dir(relative_path(git_dir, work_tree));
355 initialized = 1;
356}
357static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
359{
360 char repo_config[PATH_MAX+1];
361 /*
363 * git_config() can't be used here because it calls git_pathdup()
364 * to get $GIT_CONFIG/config. That call will make setup_git_env()
365 * set git_dir to ".git".
366 *
367 * We are in gitdir setup, no git dir has been found useable yet.
368 * Use a gentler version of git_config() to check if this repo
369 * is a good one.
370 */
371 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
372 git_config_early(check_repository_format_version, NULL, repo_config);
373 if (GIT_REPO_VERSION < repository_format_version) {
374 if (!nongit_ok)
375 die ("Expected git repo version <= %d, found %d",
376 GIT_REPO_VERSION, repository_format_version);
377 warning("Expected git repo version <= %d, found %d",
378 GIT_REPO_VERSION, repository_format_version);
379 warning("Please upgrade Git");
380 *nongit_ok = -1;
381 return -1;
382 }
383 return 0;
384}
385/*
387 * Try to read the location of the git directory from the .git file,
388 * return path to git directory if found.
389 */
390const char *read_gitfile(const char *path)
391{
392 char *buf;
393 char *dir;
394 const char *slash;
395 struct stat st;
396 int fd;
397 ssize_t len;
398 if (stat(path, &st))
400 return NULL;
401 if (!S_ISREG(st.st_mode))
402 return NULL;
403 fd = open(path, O_RDONLY);
404 if (fd < 0)
405 die_errno("Error opening '%s'", path);
406 buf = xmalloc(st.st_size + 1);
407 len = read_in_full(fd, buf, st.st_size);
408 close(fd);
409 if (len != st.st_size)
410 die("Error reading %s", path);
411 buf[len] = '\0';
412 if (prefixcmp(buf, "gitdir: "))
413 die("Invalid gitfile format: %s", path);
414 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
415 len--;
416 if (len < 9)
417 die("No path in gitfile: %s", path);
418 buf[len] = '\0';
419 dir = buf + 8;
420 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
422 size_t pathlen = slash+1 - path;
423 size_t dirlen = pathlen + len - 8;
424 dir = xmalloc(dirlen + 1);
425 strncpy(dir, path, pathlen);
426 strncpy(dir + pathlen, buf + 8, len - 8);
427 dir[dirlen] = '\0';
428 free(buf);
429 buf = dir;
430 }
431 if (!is_git_directory(dir))
433 die("Not a git repository: %s", dir);
434 path = real_path(dir);
435 free(buf);
437 return path;
438}
439static const char *setup_explicit_git_dir(const char *gitdirenv,
441 char *cwd, int len,
442 int *nongit_ok)
443{
444 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
445 const char *worktree;
446 char *gitfile;
447 int offset;
448 if (PATH_MAX - 40 < strlen(gitdirenv))
450 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
451 gitfile = (char*)read_gitfile(gitdirenv);
453 if (gitfile) {
454 gitfile = xstrdup(gitfile);
455 gitdirenv = gitfile;
456 }
457 if (!is_git_directory(gitdirenv)) {
459 if (nongit_ok) {
460 *nongit_ok = 1;
461 free(gitfile);
462 return NULL;
463 }
464 die("Not a git repository: '%s'", gitdirenv);
465 }
466 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
468 free(gitfile);
469 return NULL;
470 }
471 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
473 if (work_tree_env)
474 set_git_work_tree(work_tree_env);
475 else if (is_bare_repository_cfg > 0) {
476 if (git_work_tree_cfg) /* #22.2, #30 */
477 die("core.bare and core.worktree do not make sense");
478 /* #18, #26 */
480 set_git_dir(gitdirenv);
481 free(gitfile);
482 return NULL;
483 }
484 else if (git_work_tree_cfg) { /* #6, #14 */
485 if (is_absolute_path(git_work_tree_cfg))
486 set_git_work_tree(git_work_tree_cfg);
487 else {
488 char core_worktree[PATH_MAX];
489 if (chdir(gitdirenv))
490 die_errno("Could not chdir to '%s'", gitdirenv);
491 if (chdir(git_work_tree_cfg))
492 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
493 if (!getcwd(core_worktree, PATH_MAX))
494 die_errno("Could not get directory '%s'", git_work_tree_cfg);
495 if (chdir(cwd))
496 die_errno("Could not come back to cwd");
497 set_git_work_tree(core_worktree);
498 }
499 }
500 else /* #2, #10 */
501 set_git_work_tree(".");
502 /* set_git_work_tree() must have been called by now */
504 worktree = get_git_work_tree();
505 /* both get_git_work_tree() and cwd are already normalized */
507 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
508 set_git_dir(gitdirenv);
509 free(gitfile);
510 return NULL;
511 }
512 offset = dir_inside_of(cwd, worktree);
514 if (offset >= 0) { /* cwd inside worktree? */
515 set_git_dir(real_path(gitdirenv));
516 if (chdir(worktree))
517 die_errno("Could not chdir to '%s'", worktree);
518 cwd[len++] = '/';
519 cwd[len] = '\0';
520 free(gitfile);
521 return cwd + offset;
522 }
523 /* cwd outside worktree */
525 set_git_dir(gitdirenv);
526 free(gitfile);
527 return NULL;
528}
529static const char *setup_discovered_git_dir(const char *gitdir,
531 char *cwd, int offset, int len,
532 int *nongit_ok)
533{
534 if (check_repository_format_gently(gitdir, nongit_ok))
535 return NULL;
536 /* --work-tree is set without --git-dir; use discovered one */
538 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
539 if (offset != len && !is_absolute_path(gitdir))
540 gitdir = xstrdup(real_path(gitdir));
541 if (chdir(cwd))
542 die_errno("Could not come back to cwd");
543 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
544 }
545 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
547 if (is_bare_repository_cfg > 0) {
548 set_git_dir(offset == len ? gitdir : real_path(gitdir));
549 if (chdir(cwd))
550 die_errno("Could not come back to cwd");
551 return NULL;
552 }
553 /* #0, #1, #5, #8, #9, #12, #13 */
555 set_git_work_tree(".");
556 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
557 set_git_dir(gitdir);
558 inside_git_dir = 0;
559 inside_work_tree = 1;
560 if (offset == len)
561 return NULL;
562 /* Make "offset" point to past the '/', and add a '/' at the end */
564 offset++;
565 cwd[len++] = '/';
566 cwd[len] = 0;
567 return cwd + offset;
568}
569/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
571static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
572{
573 int root_len;
574 if (check_repository_format_gently(".", nongit_ok))
576 return NULL;
577 /* --work-tree is set without --git-dir; use discovered one */
579 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
580 const char *gitdir;
581 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
583 if (chdir(cwd))
584 die_errno("Could not come back to cwd");
585 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
586 }
587 inside_git_dir = 1;
589 inside_work_tree = 0;
590 if (offset != len) {
591 if (chdir(cwd))
592 die_errno("Cannot come back to cwd");
593 root_len = offset_1st_component(cwd);
594 cwd[offset > root_len ? offset : root_len] = '\0';
595 set_git_dir(cwd);
596 }
597 else
598 set_git_dir(".");
599 return NULL;
600}
601static const char *setup_nongit(const char *cwd, int *nongit_ok)
603{
604 if (!nongit_ok)
605 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
606 if (chdir(cwd))
607 die_errno("Cannot come back to cwd");
608 *nongit_ok = 1;
609 return NULL;
610}
611static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
613{
614 struct stat buf;
615 if (stat(path, &buf)) {
616 die_errno("failed to stat '%*s%s%s'",
617 prefix_len,
618 prefix ? prefix : "",
619 prefix ? "/" : "", path);
620 }
621 return buf.st_dev;
622}
623/*
625 * A "string_list_each_func_t" function that canonicalizes an entry
626 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
627 * discards it if unusable.
628 */
629static int canonicalize_ceiling_entry(struct string_list_item *item,
630 void *unused)
631{
632 char *ceil = item->string;
633 const char *real_path;
634 if (!*ceil || !is_absolute_path(ceil))
636 return 0;
637 real_path = real_path_if_valid(ceil);
638 if (!real_path)
639 return 0;
640 free(item->string);
641 item->string = xstrdup(real_path);
642 return 1;
643}
644/*
646 * We cannot decide in this function whether we are in the work tree or
647 * not, since the config can only be read _after_ this function was called.
648 */
649static const char *setup_git_directory_gently_1(int *nongit_ok)
650{
651 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
652 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
653 static char cwd[PATH_MAX+1];
654 const char *gitdirenv, *ret;
655 char *gitfile;
656 int len, offset, offset_parent, ceil_offset = -1;
657 dev_t current_device = 0;
658 int one_filesystem = 1;
659 /*
661 * Let's assume that we are in a git repository.
662 * If it turns out later that we are somewhere else, the value will be
663 * updated accordingly.
664 */
665 if (nongit_ok)
666 *nongit_ok = 0;
667 if (!getcwd(cwd, sizeof(cwd)-1))
669 die_errno("Unable to read current working directory");
670 offset = len = strlen(cwd);
671 /*
673 * If GIT_DIR is set explicitly, we're not going
674 * to do any discovery, but we still do repository
675 * validation.
676 */
677 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
678 if (gitdirenv)
679 return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
680 if (env_ceiling_dirs) {
682 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
683 filter_string_list(&ceiling_dirs, 0,
684 canonicalize_ceiling_entry, NULL);
685 ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs);
686 string_list_clear(&ceiling_dirs, 0);
687 }
688 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
690 ceil_offset = 1;
691 /*
693 * Test in the following order (relative to the cwd):
694 * - .git (file containing "gitdir: <path>")
695 * - .git/
696 * - ./ (bare)
697 * - ../.git
698 * - ../.git/
699 * - ../ (bare)
700 * - ../../.git/
701 * etc.
702 */
703 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
704 if (one_filesystem)
705 current_device = get_device_or_die(".", NULL, 0);
706 for (;;) {
707 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
708 if (gitfile)
709 gitdirenv = gitfile = xstrdup(gitfile);
710 else {
711 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
712 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
713 }
714 if (gitdirenv) {
716 ret = setup_discovered_git_dir(gitdirenv,
717 cwd, offset, len,
718 nongit_ok);
719 free(gitfile);
720 return ret;
721 }
722 free(gitfile);
723 if (is_git_directory("."))
725 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
726 offset_parent = offset;
728 while (--offset_parent > ceil_offset && cwd[offset_parent] != '/');
729 if (offset_parent <= ceil_offset)
730 return setup_nongit(cwd, nongit_ok);
731 if (one_filesystem) {
732 dev_t parent_device = get_device_or_die("..", cwd, offset);
733 if (parent_device != current_device) {
734 if (nongit_ok) {
735 if (chdir(cwd))
736 die_errno("Cannot come back to cwd");
737 *nongit_ok = 1;
738 return NULL;
739 }
740 cwd[offset] = '\0';
741 die("Not a git repository (or any parent up to mount point %s)\n"
742 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
743 }
744 }
745 if (chdir("..")) {
746 cwd[offset] = '\0';
747 die_errno("Cannot change to '%s/..'", cwd);
748 }
749 offset = offset_parent;
750 }
751}
752const char *setup_git_directory_gently(int *nongit_ok)
754{
755 const char *prefix;
756 prefix = setup_git_directory_gently_1(nongit_ok);
758 if (prefix)
759 setenv("GIT_PREFIX", prefix, 1);
760 else
761 setenv("GIT_PREFIX", "", 1);
762 if (startup_info) {
764 startup_info->have_repository = !nongit_ok || !*nongit_ok;
765 startup_info->prefix = prefix;
766 }
767 return prefix;
768}
769int git_config_perm(const char *var, const char *value)
771{
772 int i;
773 char *endptr;
774 if (value == NULL)
776 return PERM_GROUP;
777 if (!strcmp(value, "umask"))
779 return PERM_UMASK;
780 if (!strcmp(value, "group"))
781 return PERM_GROUP;
782 if (!strcmp(value, "all") ||
783 !strcmp(value, "world") ||
784 !strcmp(value, "everybody"))
785 return PERM_EVERYBODY;
786 /* Parse octal numbers */
788 i = strtol(value, &endptr, 8);
789 /* If not an octal number, maybe true/false? */
791 if (*endptr != 0)
792 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
793 /*
795 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
796 * a chmod value to restrict to.
797 */
798 switch (i) {
799 case PERM_UMASK: /* 0 */
800 return PERM_UMASK;
801 case OLD_PERM_GROUP: /* 1 */
802 return PERM_GROUP;
803 case OLD_PERM_EVERYBODY: /* 2 */
804 return PERM_EVERYBODY;
805 }
806 /* A filemode value was given: 0xxx */
808 if ((i & 0600) != 0600)
810 die("Problem with core.sharedRepository filemode value "
811 "(0%.3o).\nThe owner of files must always have "
812 "read and write permissions.", i);
813 /*
815 * Mask filemode value. Others can not get write permission.
816 * x flags for directories are handled separately.
817 */
818 return -(i & 0666);
819}
820int check_repository_format_version(const char *var, const char *value, void *cb)
822{
823 if (strcmp(var, "core.repositoryformatversion") == 0)
824 repository_format_version = git_config_int(var, value);
825 else if (strcmp(var, "core.sharedrepository") == 0)
826 shared_repository = git_config_perm(var, value);
827 else if (strcmp(var, "core.bare") == 0) {
828 is_bare_repository_cfg = git_config_bool(var, value);
829 if (is_bare_repository_cfg == 1)
830 inside_work_tree = -1;
831 } else if (strcmp(var, "core.worktree") == 0) {
832 if (!value)
833 return config_error_nonbool(var);
834 free(git_work_tree_cfg);
835 git_work_tree_cfg = xstrdup(value);
836 inside_work_tree = -1;
837 }
838 return 0;
839}
840int check_repository_format(void)
842{
843 return check_repository_format_gently(get_git_dir(), NULL);
844}
845/*
847 * Returns the "prefix", a path to the current working directory
848 * relative to the work tree root, or NULL, if the current working
849 * directory is not a strict subdirectory of the work tree root. The
850 * prefix always ends with a '/' character.
851 */
852const char *setup_git_directory(void)
853{
854 return setup_git_directory_gently(NULL);
855}
856const char *resolve_gitdir(const char *suspect)
858{
859 if (is_git_directory(suspect))
860 return suspect;
861 return read_gitfile(suspect);
862}