real_path: clarify return value ownership
[git/git.git] / setup.c
CommitLineData
d288a700 1#include "cache.h"
c14c234f 2#include "repository.h"
b2141fc1 3#include "config.h"
e90fdc39 4#include "dir.h"
31171d9e 5#include "string-list.h"
e90fdc39
JS
6
7static int inside_git_dir = -1;
8static int inside_work_tree = -1;
fada7674 9static int work_tree_config_is_bogus;
d288a700 10
46c3cd44
JK
11static struct startup_info the_startup_info;
12struct startup_info *startup_info = &the_startup_info;
13
ddc2a628
MEW
14/*
15 * The input parameter must contain an absolute path, and it must already be
16 * normalized.
17 *
18 * Find the part of an absolute path that lies inside the work tree by
19 * dereferencing symlinks outside the work tree, for example:
20 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
21 * /dir/file (work tree is /) -> dir/file
22 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
23 * /dir/repolink/file (repolink points to /dir/repo) -> file
24 * /dir/repo (exactly equal to work tree) -> (empty string)
25 */
26static int abspath_part_inside_repo(char *path)
27{
28 size_t len;
29 size_t wtlen;
30 char *path0;
31 int off;
32 const char *work_tree = get_git_work_tree();
33
34 if (!work_tree)
35 return -1;
36 wtlen = strlen(work_tree);
37 len = strlen(path);
6127ff63 38 off = offset_1st_component(path);
ddc2a628
MEW
39
40 /* check if work tree is already the prefix */
41 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
42 if (path[wtlen] == '/') {
43 memmove(path, path + wtlen + 1, len - wtlen);
44 return 0;
45 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
46 /* work tree is the root, or the whole path */
47 memmove(path, path + wtlen, len - wtlen + 1);
48 return 0;
49 }
50 /* work tree might match beginning of a symlink to work tree */
51 off = wtlen;
52 }
53 path0 = path;
6127ff63 54 path += off;
ddc2a628
MEW
55
56 /* check each '/'-terminated level */
57 while (*path) {
58 path++;
59 if (*path == '/') {
60 *path = '\0';
61 if (strcmp(real_path(path0), work_tree) == 0) {
62 memmove(path0, path + 1, len - (path - path0));
63 return 0;
64 }
65 *path = '/';
66 }
67 }
68
69 /* check whole path */
70 if (strcmp(real_path(path0), work_tree) == 0) {
71 *path0 = '\0';
72 return 0;
73 }
74
75 return -1;
76}
77
645a29c4
NTND
78/*
79 * Normalize "path", prepending the "prefix" for relative paths. If
80 * remaining_prefix is not NULL, return the actual prefix still
81 * remains in the path. For example, prefix = sub1/sub2/ and path is
82 *
83 * foo -> sub1/sub2/foo (full prefix)
84 * ../foo -> sub1/foo (remaining prefix is sub1/)
85 * ../../bar -> bar (no remaining prefix)
86 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
87 * `pwd`/../bar -> sub1/bar (no remaining prefix)
88 */
89char *prefix_path_gently(const char *prefix, int len,
90 int *remaining_prefix, const char *path)
d089ebaa
JH
91{
92 const char *orig = path;
18e051a3
CMAB
93 char *sanitized;
94 if (is_absolute_path(orig)) {
3733e694 95 sanitized = xmallocz(strlen(path));
645a29c4
NTND
96 if (remaining_prefix)
97 *remaining_prefix = 0;
655ee9ea
MEW
98 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
99 free(sanitized);
100 return NULL;
101 }
102 if (abspath_part_inside_repo(sanitized)) {
103 free(sanitized);
104 return NULL;
105 }
18e051a3 106 } else {
24041d6b 107 sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path);
645a29c4
NTND
108 if (remaining_prefix)
109 *remaining_prefix = len;
655ee9ea 110 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
546e0fd9
JK
111 free(sanitized);
112 return NULL;
d089ebaa 113 }
d089ebaa
JH
114 }
115 return sanitized;
f332726e
LT
116}
117
546e0fd9
JK
118char *prefix_path(const char *prefix, int len, const char *path)
119{
645a29c4 120 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
121 if (!r)
122 die("'%s' is outside repository", path);
123 return r;
124}
125
126int path_inside_repo(const char *prefix, const char *path)
127{
128 int len = prefix ? strlen(prefix) : 0;
645a29c4 129 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
130 if (r) {
131 free(r);
132 return 1;
133 }
134 return 0;
135}
136
c6e8c800
JH
137int check_filename(const char *prefix, const char *arg)
138{
e4da43b1 139 char *to_free = NULL;
c6e8c800
JH
140 struct stat st;
141
d51c6ee0
JK
142 if (skip_prefix(arg, ":/", &arg)) {
143 if (!*arg) /* ":/" is root dir, always exists */
4db86e8b 144 return 1;
a08cbcda 145 prefix = NULL;
42471bce
JK
146 } else if (skip_prefix(arg, ":!", &arg) ||
147 skip_prefix(arg, ":^", &arg)) {
148 if (!*arg) /* excluding everything is silly, but allowed */
149 return 1;
a08cbcda
JK
150 }
151
152 if (prefix)
153 arg = to_free = prefix_filename(prefix, arg);
154
155 if (!lstat(arg, &st)) {
e4da43b1 156 free(to_free);
c6e8c800 157 return 1; /* file exists */
e4da43b1 158 }
93dd544f 159 if (is_missing_file_error(errno)) {
e4da43b1 160 free(to_free);
c6e8c800 161 return 0; /* file does not exist */
e4da43b1 162 }
c6e8c800
JH
163 die_errno("failed to stat '%s'", arg);
164}
165
023e37c3
MM
166static void NORETURN die_verify_filename(const char *prefix,
167 const char *arg,
168 int diagnose_misspelt_rev)
009fee47 169{
023e37c3 170 if (!diagnose_misspelt_rev)
ab33a76e
VA
171 die(_("%s: no such path in the working tree.\n"
172 "Use 'git <command> -- <path>...' to specify paths that do not exist locally."),
023e37c3 173 arg);
0e539dca
JH
174 /*
175 * Saying "'(icase)foo' does not exist in the index" when the
176 * user gave us ":(icase)foo" is just stupid. A magic pathspec
177 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 178 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
179 */
180 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 181 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 182
009fee47 183 /* ... or fall back the most general message. */
ab33a76e
VA
184 die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
185 "Use '--' to separate paths from revisions, like this:\n"
186 "'git <command> [<revision>...] -- [<file>...]'"), arg);
009fee47
MM
187
188}
189
c99eddd8
JK
190/*
191 * Check for arguments that don't resolve as actual files,
192 * but which look sufficiently like pathspecs that we'll consider
193 * them such for the purposes of rev/pathspec DWIM parsing.
194 */
195static int looks_like_pathspec(const char *arg)
196{
197 /* anything with a wildcard character */
198 if (!no_wildcard(arg))
199 return 1;
200
201 /* long-form pathspec magic */
202 if (starts_with(arg, ":("))
203 return 1;
204
205 return 0;
206}
207
e23d0b4a
LT
208/*
209 * Verify a filename that we got as an argument for a pathspec
210 * entry. Note that a filename that begins with "-" never verifies
211 * as true, because even if such a filename were to exist, we want
212 * it to be preceded by the "--" marker (or we want the user to
213 * use a format like "./-filename")
023e37c3
MM
214 *
215 * The "diagnose_misspelt_rev" is used to provide a user-friendly
216 * diagnosis when dying upon finding that "name" is not a pathname.
217 * If set to 1, the diagnosis will try to diagnose "name" as an
218 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
219 * will only complain about an inexisting file.
220 *
221 * This function is typically called to check that a "file or rev"
222 * argument is unambiguous. In this case, the caller will want
223 * diagnose_misspelt_rev == 1 when verifying the first non-rev
224 * argument (which could have been a revision), and
225 * diagnose_misspelt_rev == 0 for the next ones (because we already
226 * saw a filename, there's not ambiguity anymore).
e23d0b4a 227 */
023e37c3
MM
228void verify_filename(const char *prefix,
229 const char *arg,
230 int diagnose_misspelt_rev)
e23d0b4a 231{
e23d0b4a
LT
232 if (*arg == '-')
233 die("bad flag '%s' used after filename", arg);
2cb47ab6 234 if (looks_like_pathspec(arg) || check_filename(prefix, arg))
e23d0b4a 235 return;
023e37c3 236 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
237}
238
ea92f41f
JH
239/*
240 * Opposite of the above: the command line did not have -- marker
241 * and we parsed the arg as a refname. It should not be interpretable
242 * as a filename.
243 */
244void verify_non_filename(const char *prefix, const char *arg)
245{
7ae3df8c 246 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 247 return;
ea92f41f
JH
248 if (*arg == '-')
249 return; /* flag */
c6e8c800
JH
250 if (!check_filename(prefix, arg))
251 return;
ab33a76e
VA
252 die(_("ambiguous argument '%s': both revision and filename\n"
253 "Use '--' to separate paths from revisions, like this:\n"
254 "'git <command> [<revision>...] -- [<file>...]'"), arg);
ea92f41f
JH
255}
256
31e26ebc 257int get_common_dir(struct strbuf *sb, const char *gitdir)
11f9dd71
MK
258{
259 const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
260 if (git_env_common_dir) {
261 strbuf_addstr(sb, git_env_common_dir);
262 return 1;
263 } else {
264 return get_common_dir_noenv(sb, gitdir);
265 }
266}
267
268int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)
4dc4e145
NTND
269{
270 struct strbuf data = STRBUF_INIT;
271 struct strbuf path = STRBUF_INIT;
31e26ebc 272 int ret = 0;
11f9dd71 273
4dc4e145
NTND
274 strbuf_addf(&path, "%s/commondir", gitdir);
275 if (file_exists(path.buf)) {
276 if (strbuf_read_file(&data, path.buf, 0) <= 0)
277 die_errno(_("failed to read %s"), path.buf);
278 while (data.len && (data.buf[data.len - 1] == '\n' ||
279 data.buf[data.len - 1] == '\r'))
280 data.len--;
281 data.buf[data.len] = '\0';
282 strbuf_reset(&path);
283 if (!is_absolute_path(data.buf))
284 strbuf_addf(&path, "%s/", gitdir);
285 strbuf_addbuf(&path, &data);
33ad9ddd 286 strbuf_add_real_path(sb, path.buf);
31e26ebc 287 ret = 1;
4ac9006f 288 } else {
4dc4e145 289 strbuf_addstr(sb, gitdir);
4ac9006f
BW
290 }
291
4dc4e145
NTND
292 strbuf_release(&data);
293 strbuf_release(&path);
31e26ebc 294 return ret;
4dc4e145 295}
d288a700 296
5f5608bc 297/*
ad1a382f 298 * Test if it looks like we're at a git directory.
5e7bfe25 299 * We want to see:
5f5608bc 300 *
790296fd 301 * - either an objects/ directory _or_ the proper
5f5608bc 302 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 303 * - a refs/ directory
8098a178 304 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
305 * a proper "ref:", or a regular file HEAD that has a properly
306 * formatted sha1 object name.
5f5608bc 307 */
b3256eb8 308int is_git_directory(const char *suspect)
5f5608bc 309{
1d186b6f
NTND
310 struct strbuf path = STRBUF_INIT;
311 int ret = 0;
312 size_t len;
ad1a382f 313
4dc4e145
NTND
314 /* Check worktree-related signatures */
315 strbuf_addf(&path, "%s/HEAD", suspect);
316 if (validate_headref(path.buf))
317 goto done;
318
319 strbuf_reset(&path);
320 get_common_dir(&path, suspect);
1d186b6f 321 len = path.len;
4dc4e145
NTND
322
323 /* Check non-worktree-related signatures */
ad1a382f
SP
324 if (getenv(DB_ENVIRONMENT)) {
325 if (access(getenv(DB_ENVIRONMENT), X_OK))
1d186b6f 326 goto done;
ad1a382f
SP
327 }
328 else {
4dc4e145 329 strbuf_setlen(&path, len);
1d186b6f
NTND
330 strbuf_addstr(&path, "/objects");
331 if (access(path.buf, X_OK))
332 goto done;
ad1a382f
SP
333 }
334
1d186b6f
NTND
335 strbuf_setlen(&path, len);
336 strbuf_addstr(&path, "/refs");
337 if (access(path.buf, X_OK))
338 goto done;
ad1a382f 339
1d186b6f
NTND
340 ret = 1;
341done:
342 strbuf_release(&path);
343 return ret;
5f5608bc
LT
344}
345
ffd036b1
JK
346int is_nonbare_repository_dir(struct strbuf *path)
347{
348 int ret = 0;
349 int gitfile_error;
350 size_t orig_path_len = path->len;
351 assert(orig_path_len != 0);
352 strbuf_complete(path, '/');
353 strbuf_addstr(path, ".git");
354 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
355 ret = 1;
356 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
357 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
358 ret = 1;
359 strbuf_setlen(path, orig_path_len);
360 return ret;
361}
362
68025633
JS
363int is_inside_git_dir(void)
364{
e90fdc39
JS
365 if (inside_git_dir < 0)
366 inside_git_dir = is_inside_dir(get_git_dir());
367 return inside_git_dir;
892c41b9
ML
368}
369
892c41b9
ML
370int is_inside_work_tree(void)
371{
e90fdc39
JS
372 if (inside_work_tree < 0)
373 inside_work_tree = is_inside_dir(get_git_work_tree());
374 return inside_work_tree;
892c41b9
ML
375}
376
f3fa1838
JH
377void setup_work_tree(void)
378{
354e6534
JS
379 const char *work_tree, *git_dir;
380 static int initialized = 0;
381
382 if (initialized)
383 return;
fada7674
JK
384
385 if (work_tree_config_is_bogus)
386 die("unable to set up work tree using invalid config");
387
354e6534
JS
388 work_tree = get_git_work_tree();
389 git_dir = get_git_dir();
59f0f2f3 390 if (!is_absolute_path(git_dir))
e2a57aac 391 git_dir = real_path(get_git_dir());
59f0f2f3
MH
392 if (!work_tree || chdir(work_tree))
393 die("This operation must be run in a work tree");
0ed74813
NTND
394
395 /*
396 * Make sure subsequent git processes find correct worktree
397 * if $GIT_WORK_TREE is set relative
398 */
399 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
400 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
401
41894ae3 402 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 403 initialized = 1;
59f0f2f3
MH
404}
405
2cc7c2c7 406static int check_repo_format(const char *var, const char *value, void *vdata)
31e26ebc 407{
2cc7c2c7 408 struct repository_format *data = vdata;
00a09d57
JK
409 const char *ext;
410
31e26ebc 411 if (strcmp(var, "core.repositoryformatversion") == 0)
2cc7c2c7 412 data->version = git_config_int(var, value);
00a09d57
JK
413 else if (skip_prefix(var, "extensions.", &ext)) {
414 /*
415 * record any known extensions here; otherwise,
416 * we fall through to recording it as unknown, and
417 * check_repository_format will complain
418 */
419 if (!strcmp(ext, "noop"))
420 ;
067fbd41 421 else if (!strcmp(ext, "preciousobjects"))
2cc7c2c7 422 data->precious_objects = git_config_bool(var, value);
00a09d57 423 else
2cc7c2c7 424 string_list_append(&data->unknown_extensions, ext);
652f18ee
JK
425 } else if (strcmp(var, "core.bare") == 0) {
426 data->is_bare = git_config_bool(var, value);
427 } else if (strcmp(var, "core.worktree") == 0) {
428 if (!value)
429 return config_error_nonbool(var);
430 data->work_tree = xstrdup(value);
00a09d57 431 }
31e26ebc
NTND
432 return 0;
433}
434
337e51ce 435static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 436{
7d0fb0da 437 struct strbuf sb = STRBUF_INIT;
2cc7c2c7
JK
438 struct strbuf err = STRBUF_INIT;
439 struct repository_format candidate;
652f18ee 440 int has_common;
00a09d57 441
652f18ee 442 has_common = get_common_dir(&sb, gitdir);
e61a509a 443 strbuf_addstr(&sb, "/config");
652f18ee 444 read_repository_format(&candidate, sb.buf);
2cc7c2c7 445 strbuf_release(&sb);
e61a509a 446
337e51ce 447 /*
2cc7c2c7
JK
448 * For historical use of check_repository_format() in git-init,
449 * we treat a missing config as a silent "ok", even when nongit_ok
450 * is unset.
337e51ce 451 */
2cc7c2c7
JK
452 if (candidate.version < 0)
453 return 0;
454
455 if (verify_repository_format(&candidate, &err) < 0) {
456 if (nongit_ok) {
457 warning("%s", err.buf);
458 strbuf_release(&err);
459 *nongit_ok = -1;
460 return -1;
461 }
462 die("%s", err.buf);
463 }
464
2cc7c2c7
JK
465 repository_format_precious_objects = candidate.precious_objects;
466 string_list_clear(&candidate.unknown_extensions, 0);
652f18ee
JK
467 if (!has_common) {
468 if (candidate.is_bare != -1) {
469 is_bare_repository_cfg = candidate.is_bare;
470 if (is_bare_repository_cfg == 1)
471 inside_work_tree = -1;
472 }
473 if (candidate.work_tree) {
474 free(git_work_tree_cfg);
475 git_work_tree_cfg = candidate.work_tree;
2cc7c2c7 476 inside_work_tree = -1;
652f18ee
JK
477 }
478 } else {
479 free(candidate.work_tree);
2cc7c2c7
JK
480 }
481
482 return 0;
483}
484
652f18ee 485int read_repository_format(struct repository_format *format, const char *path)
2cc7c2c7
JK
486{
487 memset(format, 0, sizeof(*format));
488 format->version = -1;
489 format->is_bare = -1;
490 string_list_init(&format->unknown_extensions, 1);
652f18ee 491 git_config_from_file(check_repo_format, path, format);
2cc7c2c7
JK
492 return format->version;
493}
494
2cc7c2c7
JK
495int verify_repository_format(const struct repository_format *format,
496 struct strbuf *err)
497{
498 if (GIT_REPO_VERSION_READ < format->version) {
274db840 499 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
2cc7c2c7
JK
500 GIT_REPO_VERSION_READ, format->version);
501 return -1;
502 }
503
504 if (format->version >= 1 && format->unknown_extensions.nr) {
00a09d57
JK
505 int i;
506
274db840 507 strbuf_addstr(err, _("unknown repository extensions found:"));
00a09d57 508
2cc7c2c7
JK
509 for (i = 0; i < format->unknown_extensions.nr; i++)
510 strbuf_addf(err, "\n\t%s",
511 format->unknown_extensions.items[i].string);
512 return -1;
00a09d57
JK
513 }
514
2cc7c2c7 515 return 0;
9459aa77
NTND
516}
517
5f29433f
SB
518void read_gitfile_error_die(int error_code, const char *path, const char *dir)
519{
520 switch (error_code) {
521 case READ_GITFILE_ERR_STAT_FAILED:
522 case READ_GITFILE_ERR_NOT_A_FILE:
523 /* non-fatal; follow return path */
524 break;
525 case READ_GITFILE_ERR_OPEN_FAILED:
526 die_errno("Error opening '%s'", path);
527 case READ_GITFILE_ERR_TOO_LARGE:
528 die("Too large to be a .git file: '%s'", path);
529 case READ_GITFILE_ERR_READ_FAILED:
530 die("Error reading %s", path);
531 case READ_GITFILE_ERR_INVALID_FORMAT:
532 die("Invalid gitfile format: %s", path);
533 case READ_GITFILE_ERR_NO_PATH:
534 die("No path in gitfile: %s", path);
535 case READ_GITFILE_ERR_NOT_A_REPO:
536 die("Not a git repository: %s", dir);
537 default:
538 die("BUG: unknown error code");
539 }
540}
541
b44ebb19
LH
542/*
543 * Try to read the location of the git directory from the .git file,
544 * return path to git directory if found.
a93bedad
EE
545 *
546 * On failure, if return_error_code is not NULL, return_error_code
547 * will be set to an error code and NULL will be returned. If
548 * return_error_code is NULL the function will die instead (for most
549 * cases).
b44ebb19 550 */
a93bedad 551const char *read_gitfile_gently(const char *path, int *return_error_code)
b44ebb19 552{
921bdd96 553 const int max_file_size = 1 << 20; /* 1MB */
a93bedad
EE
554 int error_code = 0;
555 char *buf = NULL;
556 char *dir = NULL;
40c813e0 557 const char *slash;
b44ebb19
LH
558 struct stat st;
559 int fd;
b1905aea 560 ssize_t len;
b44ebb19 561
a93bedad 562 if (stat(path, &st)) {
5c4003ca 563 /* NEEDSWORK: discern between ENOENT vs other errors */
a93bedad
EE
564 error_code = READ_GITFILE_ERR_STAT_FAILED;
565 goto cleanup_return;
566 }
567 if (!S_ISREG(st.st_mode)) {
568 error_code = READ_GITFILE_ERR_NOT_A_FILE;
569 goto cleanup_return;
570 }
921bdd96
EE
571 if (st.st_size > max_file_size) {
572 error_code = READ_GITFILE_ERR_TOO_LARGE;
573 goto cleanup_return;
574 }
b44ebb19 575 fd = open(path, O_RDONLY);
a93bedad
EE
576 if (fd < 0) {
577 error_code = READ_GITFILE_ERR_OPEN_FAILED;
578 goto cleanup_return;
579 }
3733e694 580 buf = xmallocz(st.st_size);
b44ebb19
LH
581 len = read_in_full(fd, buf, st.st_size);
582 close(fd);
a93bedad
EE
583 if (len != st.st_size) {
584 error_code = READ_GITFILE_ERR_READ_FAILED;
585 goto cleanup_return;
586 }
a93bedad
EE
587 if (!starts_with(buf, "gitdir: ")) {
588 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
589 goto cleanup_return;
590 }
b44ebb19
LH
591 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
592 len--;
a93bedad
EE
593 if (len < 9) {
594 error_code = READ_GITFILE_ERR_NO_PATH;
595 goto cleanup_return;
596 }
b44ebb19 597 buf[len] = '\0';
40c813e0
BK
598 dir = buf + 8;
599
600 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
601 size_t pathlen = slash+1 - path;
75faa45a
JK
602 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
603 (int)(len - 8), buf + 8);
40c813e0
BK
604 free(buf);
605 buf = dir;
606 }
a93bedad
EE
607 if (!is_git_directory(dir)) {
608 error_code = READ_GITFILE_ERR_NOT_A_REPO;
609 goto cleanup_return;
610 }
e2a57aac 611 path = real_path(dir);
40c813e0 612
a93bedad 613cleanup_return:
a93bedad
EE
614 if (return_error_code)
615 *return_error_code = error_code;
5f29433f
SB
616 else if (error_code)
617 read_gitfile_error_die(error_code, path, dir);
a93bedad 618
b44ebb19 619 free(buf);
38ae8784 620 return error_code ? NULL : path;
b44ebb19
LH
621}
622
e4e30347 623static const char *setup_explicit_git_dir(const char *gitdirenv,
7333ed17 624 struct strbuf *cwd,
b3f66fd3 625 int *nongit_ok)
e4e30347 626{
b3f66fd3
NTND
627 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
628 const char *worktree;
629 char *gitfile;
9b125da4 630 int offset;
e4e30347
JN
631
632 if (PATH_MAX - 40 < strlen(gitdirenv))
633 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 634
13d6ec91 635 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
636 if (gitfile) {
637 gitfile = xstrdup(gitfile);
638 gitdirenv = gitfile;
639 }
640
e4e30347
JN
641 if (!is_git_directory(gitdirenv)) {
642 if (nongit_ok) {
643 *nongit_ok = 1;
b3f66fd3 644 free(gitfile);
e4e30347
JN
645 return NULL;
646 }
647 die("Not a git repository: '%s'", gitdirenv);
648 }
b3f66fd3
NTND
649
650 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
651 free(gitfile);
652 return NULL;
e4e30347 653 }
b3f66fd3
NTND
654
655 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
656 if (work_tree_env)
657 set_git_work_tree(work_tree_env);
658 else if (is_bare_repository_cfg > 0) {
fada7674
JK
659 if (git_work_tree_cfg) {
660 /* #22.2, #30 */
661 warning("core.bare and core.worktree do not make sense");
662 work_tree_config_is_bogus = 1;
663 }
b3f66fd3
NTND
664
665 /* #18, #26 */
666 set_git_dir(gitdirenv);
667 free(gitfile);
e4e30347 668 return NULL;
b3f66fd3
NTND
669 }
670 else if (git_work_tree_cfg) { /* #6, #14 */
671 if (is_absolute_path(git_work_tree_cfg))
672 set_git_work_tree(git_work_tree_cfg);
673 else {
56b9f6e7 674 char *core_worktree;
b3f66fd3
NTND
675 if (chdir(gitdirenv))
676 die_errno("Could not chdir to '%s'", gitdirenv);
677 if (chdir(git_work_tree_cfg))
678 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
56b9f6e7 679 core_worktree = xgetcwd();
7333ed17 680 if (chdir(cwd->buf))
b3f66fd3
NTND
681 die_errno("Could not come back to cwd");
682 set_git_work_tree(core_worktree);
56b9f6e7 683 free(core_worktree);
b3f66fd3
NTND
684 }
685 }
2cd83d10
JK
686 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
687 /* #16d */
688 set_git_dir(gitdirenv);
689 free(gitfile);
690 return NULL;
691 }
b3f66fd3
NTND
692 else /* #2, #10 */
693 set_git_work_tree(".");
694
695 /* set_git_work_tree() must have been called by now */
696 worktree = get_git_work_tree();
697
698 /* both get_git_work_tree() and cwd are already normalized */
7333ed17 699 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
b3f66fd3
NTND
700 set_git_dir(gitdirenv);
701 free(gitfile);
e4e30347 702 return NULL;
b3f66fd3 703 }
e4e30347 704
7333ed17 705 offset = dir_inside_of(cwd->buf, worktree);
9b125da4 706 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 707 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
708 if (chdir(worktree))
709 die_errno("Could not chdir to '%s'", worktree);
7333ed17 710 strbuf_addch(cwd, '/');
b3f66fd3 711 free(gitfile);
7333ed17 712 return cwd->buf + offset;
93a00542 713 }
b3f66fd3
NTND
714
715 /* cwd outside worktree */
716 set_git_dir(gitdirenv);
717 free(gitfile);
718 return NULL;
93a00542
JN
719}
720
9951d3b3 721static const char *setup_discovered_git_dir(const char *gitdir,
7333ed17 722 struct strbuf *cwd, int offset,
9951d3b3 723 int *nongit_ok)
98937bef 724{
9951d3b3
NTND
725 if (check_repository_format_gently(gitdir, nongit_ok))
726 return NULL;
98937bef 727
4868b2ea
JN
728 /* --work-tree is set without --git-dir; use discovered one */
729 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
2d4dcf21
JS
730 char *to_free = NULL;
731 const char *ret;
732
7333ed17 733 if (offset != cwd->len && !is_absolute_path(gitdir))
2d4dcf21 734 gitdir = to_free = real_pathdup(gitdir, 1);
7333ed17 735 if (chdir(cwd->buf))
4868b2ea 736 die_errno("Could not come back to cwd");
2d4dcf21
JS
737 ret = setup_explicit_git_dir(gitdir, cwd, nongit_ok);
738 free(to_free);
739 return ret;
4868b2ea
JN
740 }
741
9951d3b3
NTND
742 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
743 if (is_bare_repository_cfg > 0) {
7333ed17
RS
744 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
745 if (chdir(cwd->buf))
9951d3b3 746 die_errno("Could not come back to cwd");
98937bef 747 return NULL;
9951d3b3 748 }
98937bef 749
9951d3b3
NTND
750 /* #0, #1, #5, #8, #9, #12, #13 */
751 set_git_work_tree(".");
752 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
753 set_git_dir(gitdir);
98937bef 754 inside_git_dir = 0;
9951d3b3 755 inside_work_tree = 1;
7333ed17 756 if (offset == cwd->len)
98937bef
NTND
757 return NULL;
758
df380d58
JS
759 /* Make "offset" point past the '/' (already the case for root dirs) */
760 if (offset != offset_1st_component(cwd->buf))
761 offset++;
762 /* Add a '/' at the end */
7333ed17
RS
763 strbuf_addch(cwd, '/');
764 return cwd->buf + offset;
98937bef
NTND
765}
766
1cd8031b 767/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
7333ed17
RS
768static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
769 int *nongit_ok)
68698da5
JN
770{
771 int root_len;
772
1cd8031b
NTND
773 if (check_repository_format_gently(".", nongit_ok))
774 return NULL;
775
2cd83d10
JK
776 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
777
4868b2ea
JN
778 /* --work-tree is set without --git-dir; use discovered one */
779 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
da6f8475 780 static const char *gitdir;
4868b2ea 781
7333ed17
RS
782 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
783 if (chdir(cwd->buf))
4868b2ea 784 die_errno("Could not come back to cwd");
7333ed17 785 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
786 }
787
68698da5 788 inside_git_dir = 1;
1cd8031b 789 inside_work_tree = 0;
7333ed17
RS
790 if (offset != cwd->len) {
791 if (chdir(cwd->buf))
8fc0ae80 792 die_errno("Cannot come back to cwd");
7333ed17
RS
793 root_len = offset_1st_component(cwd->buf);
794 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
795 set_git_dir(cwd->buf);
337e51ce 796 }
1cd8031b 797 else
68698da5 798 set_git_dir(".");
68698da5
JN
799 return NULL;
800}
801
f161edeb
JN
802static const char *setup_nongit(const char *cwd, int *nongit_ok)
803{
804 if (!nongit_ok)
2ff30e67 805 die(_("Not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
f161edeb 806 if (chdir(cwd))
2ff30e67 807 die_errno(_("Cannot come back to cwd"));
f161edeb
JN
808 *nongit_ok = 1;
809 return NULL;
810}
811
2565b43b 812static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
813{
814 struct stat buf;
2565b43b
CB
815 if (stat(path, &buf)) {
816 die_errno("failed to stat '%*s%s%s'",
817 prefix_len,
60c98d1e
JN
818 prefix ? prefix : "",
819 prefix ? "/" : "", path);
2565b43b 820 }
60c98d1e
JN
821 return buf.st_dev;
822}
823
9e2326c7 824/*
1b77d83c
MH
825 * A "string_list_each_func_t" function that canonicalizes an entry
826 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
827 * discards it if unusable. The presence of an empty entry in
828 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
829 * subsequent entries.
9e2326c7 830 */
1b77d83c 831static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 832 void *cb_data)
9e2326c7 833{
7ec30aaa 834 int *empty_entry_found = cb_data;
1b77d83c 835 char *ceil = item->string;
9e2326c7 836
7ec30aaa
MH
837 if (!*ceil) {
838 *empty_entry_found = 1;
9e2326c7 839 return 0;
7ec30aaa 840 } else if (!is_absolute_path(ceil)) {
9e2326c7 841 return 0;
7ec30aaa
MH
842 } else if (*empty_entry_found) {
843 /* Keep entry but do not canonicalize it */
844 return 1;
845 } else {
ce83eadd 846 char *real_path = real_pathdup(ceil, 0);
4ac9006f 847 if (!real_path) {
7ec30aaa 848 return 0;
4ac9006f 849 }
7ec30aaa 850 free(item->string);
4ac9006f 851 item->string = real_path;
7ec30aaa
MH
852 return 1;
853 }
9e2326c7
MH
854}
855
ce9b8aab
JS
856enum discovery_result {
857 GIT_DIR_NONE = 0,
858 GIT_DIR_EXPLICIT,
859 GIT_DIR_DISCOVERED,
860 GIT_DIR_BARE,
861 /* these are errors */
862 GIT_DIR_HIT_CEILING = -1,
01017dce
JS
863 GIT_DIR_HIT_MOUNT_POINT = -2,
864 GIT_DIR_INVALID_GITFILE = -3
ce9b8aab
JS
865};
866
e90fdc39
JS
867/*
868 * We cannot decide in this function whether we are in the work tree or
869 * not, since the config can only be read _after_ this function was called.
ce9b8aab
JS
870 *
871 * Also, we avoid changing any global state (such as the current working
872 * directory) to allow early callers.
873 *
874 * The directory where the search should start needs to be passed in via the
875 * `dir` parameter; upon return, the `dir` buffer will contain the path of
876 * the directory where the search ended, and `gitdir` will contain the path of
877 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it
878 * is relative to `dir` (i.e. *not* necessarily the cwd).
e90fdc39 879 */
ce9b8aab 880static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
01017dce
JS
881 struct strbuf *gitdir,
882 int die_on_error)
d288a700 883{
0454dd93 884 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 885 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
ce9b8aab
JS
886 const char *gitdirenv;
887 int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1;
c7d1d1b1
RH
888 dev_t current_device = 0;
889 int one_filesystem = 1;
d288a700 890
e90fdc39
JS
891 /*
892 * If GIT_DIR is set explicitly, we're not going
893 * to do any discovery, but we still do repository
894 * validation.
895 */
ad1a382f 896 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
ce9b8aab
JS
897 if (gitdirenv) {
898 strbuf_addstr(gitdir, gitdirenv);
899 return GIT_DIR_EXPLICIT;
900 }
d288a700 901
31171d9e 902 if (env_ceiling_dirs) {
7ec30aaa
MH
903 int empty_entry_found = 0;
904
31171d9e 905 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 906 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 907 canonicalize_ceiling_entry, &empty_entry_found);
ce9b8aab 908 ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs);
31171d9e
MH
909 string_list_clear(&ceiling_dirs, 0);
910 }
911
ce9b8aab
JS
912 if (ceil_offset < 0)
913 ceil_offset = min_offset - 2;
d288a700 914
892c41b9 915 /*
ce9b8aab 916 * Test in the following order (relative to the dir):
b44ebb19 917 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
918 * - .git/
919 * - ./ (bare)
b44ebb19 920 * - ../.git
e90fdc39
JS
921 * - ../.git/
922 * - ../ (bare)
923 * - ../../.git/
924 * etc.
892c41b9 925 */
cf87463e 926 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 927 if (one_filesystem)
ce9b8aab 928 current_device = get_device_or_die(dir->buf, NULL, 0);
e90fdc39 929 for (;;) {
01017dce 930 int offset = dir->len, error_code = 0;
ce9b8aab
JS
931
932 if (offset > min_offset)
933 strbuf_addch(dir, '/');
934 strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
01017dce
JS
935 gitdirenv = read_gitfile_gently(dir->buf, die_on_error ?
936 NULL : &error_code);
937 if (!gitdirenv) {
938 if (die_on_error ||
939 error_code == READ_GITFILE_ERR_NOT_A_FILE) {
5c4003ca 940 /* NEEDSWORK: fail if .git is not file nor dir */
01017dce
JS
941 if (is_git_directory(dir->buf))
942 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
943 } else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
944 return GIT_DIR_INVALID_GITFILE;
9951d3b3 945 }
ce9b8aab 946 strbuf_setlen(dir, offset);
9951d3b3 947 if (gitdirenv) {
ce9b8aab
JS
948 strbuf_addstr(gitdir, gitdirenv);
949 return GIT_DIR_DISCOVERED;
9951d3b3 950 }
9951d3b3 951
ce9b8aab
JS
952 if (is_git_directory(dir->buf)) {
953 strbuf_addstr(gitdir, ".");
954 return GIT_DIR_BARE;
502ffe34 955 }
9951d3b3 956
ce9b8aab
JS
957 if (offset <= min_offset)
958 return GIT_DIR_HIT_CEILING;
1cd8031b 959
ce9b8aab 960 while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset]))
6c1e6544 961 ; /* continue */
ce9b8aab
JS
962 if (offset <= ceil_offset)
963 return GIT_DIR_HIT_CEILING;
964
965 strbuf_setlen(dir, offset > min_offset ? offset : min_offset);
966 if (one_filesystem &&
967 current_device != get_device_or_die(dir->buf, NULL, offset))
968 return GIT_DIR_HIT_MOUNT_POINT;
892c41b9 969 }
d288a700 970}
5e7bfe25 971
d3fb71b3
BW
972int discover_git_directory(struct strbuf *commondir,
973 struct strbuf *gitdir)
16ac8b8d
JS
974{
975 struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
976 size_t gitdir_offset = gitdir->len, cwd_len;
d3fb71b3 977 size_t commondir_offset = commondir->len;
16ac8b8d
JS
978 struct repository_format candidate;
979
980 if (strbuf_getcwd(&dir))
d3fb71b3 981 return -1;
16ac8b8d
JS
982
983 cwd_len = dir.len;
01017dce 984 if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) {
16ac8b8d 985 strbuf_release(&dir);
d3fb71b3 986 return -1;
16ac8b8d
JS
987 }
988
989 /*
990 * The returned gitdir is relative to dir, and if dir does not reflect
991 * the current working directory, we simply make the gitdir absolute.
992 */
993 if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) {
994 /* Avoid a trailing "/." */
995 if (!strcmp(".", gitdir->buf + gitdir_offset))
996 strbuf_setlen(gitdir, gitdir_offset);
997 else
998 strbuf_addch(&dir, '/');
999 strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
1000 }
1001
d3fb71b3
BW
1002 get_common_dir(commondir, gitdir->buf + gitdir_offset);
1003
16ac8b8d 1004 strbuf_reset(&dir);
d3fb71b3 1005 strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset);
16ac8b8d
JS
1006 read_repository_format(&candidate, dir.buf);
1007 strbuf_release(&dir);
1008
1009 if (verify_repository_format(&candidate, &err) < 0) {
1010 warning("ignoring git dir '%s': %s",
1011 gitdir->buf + gitdir_offset, err.buf);
1012 strbuf_release(&err);
d3fb71b3 1013 strbuf_setlen(commondir, commondir_offset);
69743f9b 1014 strbuf_setlen(gitdir, gitdir_offset);
d3fb71b3 1015 return -1;
16ac8b8d
JS
1016 }
1017
d3fb71b3 1018 return 0;
16ac8b8d
JS
1019}
1020
a60645f9
NTND
1021const char *setup_git_directory_gently(int *nongit_ok)
1022{
ce9b8aab
JS
1023 static struct strbuf cwd = STRBUF_INIT;
1024 struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
f9ee2fcd 1025 const char *prefix;
a60645f9 1026
ce9b8aab
JS
1027 /*
1028 * We may have read an incomplete configuration before
1029 * setting-up the git directory. If so, clear the cache so
1030 * that the next queries to the configuration reload complete
1031 * configuration (including the per-repo config file that we
1032 * ignored previously).
1033 */
1034 git_config_clear();
1035
1036 /*
1037 * Let's assume that we are in a git repository.
1038 * If it turns out later that we are somewhere else, the value will be
1039 * updated accordingly.
1040 */
1041 if (nongit_ok)
1042 *nongit_ok = 0;
1043
1044 if (strbuf_getcwd(&cwd))
1045 die_errno(_("Unable to read current working directory"));
1046 strbuf_addbuf(&dir, &cwd);
1047
01017dce 1048 switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) {
ce9b8aab
JS
1049 case GIT_DIR_NONE:
1050 prefix = NULL;
1051 break;
1052 case GIT_DIR_EXPLICIT:
1053 prefix = setup_explicit_git_dir(gitdir.buf, &cwd, nongit_ok);
1054 break;
1055 case GIT_DIR_DISCOVERED:
1056 if (dir.len < cwd.len && chdir(dir.buf))
1057 die(_("Cannot change to '%s'"), dir.buf);
1058 prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
1059 nongit_ok);
1060 break;
1061 case GIT_DIR_BARE:
1062 if (dir.len < cwd.len && chdir(dir.buf))
1063 die(_("Cannot change to '%s'"), dir.buf);
1064 prefix = setup_bare_git_dir(&cwd, dir.len, nongit_ok);
1065 break;
1066 case GIT_DIR_HIT_CEILING:
1067 prefix = setup_nongit(cwd.buf, nongit_ok);
1068 break;
1069 case GIT_DIR_HIT_MOUNT_POINT:
1070 if (nongit_ok) {
1071 *nongit_ok = 1;
1072 strbuf_release(&cwd);
1073 strbuf_release(&dir);
1074 return NULL;
1075 }
1076 die(_("Not a git repository (or any parent up to mount point %s)\n"
1077 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
1078 dir.buf);
1079 default:
1080 die("BUG: unhandled setup_git_directory_1() result");
1081 }
1082
1f5d271f 1083 if (prefix)
a6f7f9a3 1084 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 1085 else
a6f7f9a3 1086 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 1087
46c3cd44
JK
1088 startup_info->have_repository = !nongit_ok || !*nongit_ok;
1089 startup_info->prefix = prefix;
1090
73f192c9
BW
1091 /*
1092 * Not all paths through the setup code will call 'set_git_dir()' (which
1093 * directly sets up the environment) so in order to guarantee that the
1094 * environment is in a consistent state after setup, explicitly setup
1095 * the environment if we have a repository.
1096 *
1097 * NEEDSWORK: currently we allow bogus GIT_DIR values to be set in some
1098 * code paths so we also need to explicitly setup the environment if
1099 * the user has set GIT_DIR. It may be beneficial to disallow bogus
1100 * GIT_DIR values at some point in the future.
1101 */
c14c234f
BW
1102 if (startup_info->have_repository || getenv(GIT_DIR_ENVIRONMENT)) {
1103 if (!the_repository->gitdir) {
1104 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
1105 if (!gitdir)
1106 gitdir = DEFAULT_GIT_DIR_ENVIRONMENT;
1107 repo_set_gitdir(the_repository, gitdir);
1108 setup_git_env();
1109 }
1110 }
73f192c9 1111
ce9b8aab
JS
1112 strbuf_release(&dir);
1113 strbuf_release(&gitdir);
1114
a60645f9
NTND
1115 return prefix;
1116}
1117
94df2506
JH
1118int git_config_perm(const char *var, const char *value)
1119{
06cbe855
HO
1120 int i;
1121 char *endptr;
1122
1123 if (value == NULL)
1124 return PERM_GROUP;
1125
1126 if (!strcmp(value, "umask"))
1127 return PERM_UMASK;
1128 if (!strcmp(value, "group"))
1129 return PERM_GROUP;
1130 if (!strcmp(value, "all") ||
1131 !strcmp(value, "world") ||
1132 !strcmp(value, "everybody"))
1133 return PERM_EVERYBODY;
1134
1135 /* Parse octal numbers */
1136 i = strtol(value, &endptr, 8);
1137
1138 /* If not an octal number, maybe true/false? */
1139 if (*endptr != 0)
1140 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
1141
1142 /*
1143 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 1144 * a chmod value to restrict to.
06cbe855
HO
1145 */
1146 switch (i) {
1147 case PERM_UMASK: /* 0 */
1148 return PERM_UMASK;
1149 case OLD_PERM_GROUP: /* 1 */
1150 return PERM_GROUP;
1151 case OLD_PERM_EVERYBODY: /* 2 */
1152 return PERM_EVERYBODY;
94df2506 1153 }
06cbe855
HO
1154
1155 /* A filemode value was given: 0xxx */
1156
1157 if ((i & 0600) != 0600)
2ff30e67 1158 die(_("Problem with core.sharedRepository filemode value "
06cbe855 1159 "(0%.3o).\nThe owner of files must always have "
2ff30e67 1160 "read and write permissions."), i);
06cbe855
HO
1161
1162 /*
1163 * Mask filemode value. Others can not get write permission.
1164 * x flags for directories are handled separately.
1165 */
5a688fe4 1166 return -(i & 0666);
94df2506
JH
1167}
1168
4b0d1eeb 1169void check_repository_format(void)
ab9cb76f 1170{
f1c126bd
JK
1171 check_repository_format_gently(get_git_dir(), NULL);
1172 startup_info->have_repository = 1;
ab9cb76f
JH
1173}
1174
e1e5ec86
CB
1175/*
1176 * Returns the "prefix", a path to the current working directory
1177 * relative to the work tree root, or NULL, if the current working
1178 * directory is not a strict subdirectory of the work tree root. The
1179 * prefix always ends with a '/' character.
1180 */
5e7bfe25
JH
1181const char *setup_git_directory(void)
1182{
b3f66fd3 1183 return setup_git_directory_gently(NULL);
5e7bfe25 1184}
abc06822 1185
40d96325 1186const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
abc06822
FG
1187{
1188 if (is_git_directory(suspect))
1189 return suspect;
40d96325 1190 return read_gitfile_gently(suspect, return_error_code);
abc06822 1191}
1d999ddd
TR
1192
1193/* if any standard file descriptor is missing open it to /dev/null */
1194void sanitize_stdfds(void)
1195{
1196 int fd = open("/dev/null", O_RDWR, 0);
1197 while (fd != -1 && fd < 2)
1198 fd = dup(fd);
1199 if (fd == -1)
1200 die_errno("open /dev/null or dup failed");
1201 if (fd > 2)
1202 close(fd);
1203}
de0957ce
NTND
1204
1205int daemonize(void)
1206{
1207#ifdef NO_POSIX_GOODIES
1208 errno = ENOSYS;
1209 return -1;
1210#else
1211 switch (fork()) {
1212 case 0:
1213 break;
1214 case -1:
1215 die_errno("fork failed");
1216 default:
1217 exit(0);
1218 }
1219 if (setsid() == -1)
1220 die_errno("setsid failed");
1221 close(0);
1222 close(1);
1223 close(2);
1224 sanitize_stdfds();
1225 return 0;
1226#endif
1227}