repository: introduce the repository object
[git/git.git] / setup.c
CommitLineData
d288a700 1#include "cache.h"
b2141fc1 2#include "config.h"
e90fdc39 3#include "dir.h"
31171d9e 4#include "string-list.h"
e90fdc39
JS
5
6static int inside_git_dir = -1;
7static int inside_work_tree = -1;
fada7674 8static int work_tree_config_is_bogus;
d288a700 9
46c3cd44
JK
10static struct startup_info the_startup_info;
11struct startup_info *startup_info = &the_startup_info;
12
ddc2a628
MEW
13/*
14 * The input parameter must contain an absolute path, and it must already be
15 * normalized.
16 *
17 * Find the part of an absolute path that lies inside the work tree by
18 * dereferencing symlinks outside the work tree, for example:
19 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
20 * /dir/file (work tree is /) -> dir/file
21 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
22 * /dir/repolink/file (repolink points to /dir/repo) -> file
23 * /dir/repo (exactly equal to work tree) -> (empty string)
24 */
25static int abspath_part_inside_repo(char *path)
26{
27 size_t len;
28 size_t wtlen;
29 char *path0;
30 int off;
31 const char *work_tree = get_git_work_tree();
32
33 if (!work_tree)
34 return -1;
35 wtlen = strlen(work_tree);
36 len = strlen(path);
6127ff63 37 off = offset_1st_component(path);
ddc2a628
MEW
38
39 /* check if work tree is already the prefix */
40 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
41 if (path[wtlen] == '/') {
42 memmove(path, path + wtlen + 1, len - wtlen);
43 return 0;
44 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
45 /* work tree is the root, or the whole path */
46 memmove(path, path + wtlen, len - wtlen + 1);
47 return 0;
48 }
49 /* work tree might match beginning of a symlink to work tree */
50 off = wtlen;
51 }
52 path0 = path;
6127ff63 53 path += off;
ddc2a628
MEW
54
55 /* check each '/'-terminated level */
56 while (*path) {
57 path++;
58 if (*path == '/') {
59 *path = '\0';
60 if (strcmp(real_path(path0), work_tree) == 0) {
61 memmove(path0, path + 1, len - (path - path0));
62 return 0;
63 }
64 *path = '/';
65 }
66 }
67
68 /* check whole path */
69 if (strcmp(real_path(path0), work_tree) == 0) {
70 *path0 = '\0';
71 return 0;
72 }
73
74 return -1;
75}
76
645a29c4
NTND
77/*
78 * Normalize "path", prepending the "prefix" for relative paths. If
79 * remaining_prefix is not NULL, return the actual prefix still
80 * remains in the path. For example, prefix = sub1/sub2/ and path is
81 *
82 * foo -> sub1/sub2/foo (full prefix)
83 * ../foo -> sub1/foo (remaining prefix is sub1/)
84 * ../../bar -> bar (no remaining prefix)
85 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
86 * `pwd`/../bar -> sub1/bar (no remaining prefix)
87 */
88char *prefix_path_gently(const char *prefix, int len,
89 int *remaining_prefix, const char *path)
d089ebaa
JH
90{
91 const char *orig = path;
18e051a3
CMAB
92 char *sanitized;
93 if (is_absolute_path(orig)) {
3733e694 94 sanitized = xmallocz(strlen(path));
645a29c4
NTND
95 if (remaining_prefix)
96 *remaining_prefix = 0;
655ee9ea
MEW
97 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
98 free(sanitized);
99 return NULL;
100 }
101 if (abspath_part_inside_repo(sanitized)) {
102 free(sanitized);
103 return NULL;
104 }
18e051a3 105 } else {
24041d6b 106 sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path);
645a29c4
NTND
107 if (remaining_prefix)
108 *remaining_prefix = len;
655ee9ea 109 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
546e0fd9
JK
110 free(sanitized);
111 return NULL;
d089ebaa 112 }
d089ebaa
JH
113 }
114 return sanitized;
f332726e
LT
115}
116
546e0fd9
JK
117char *prefix_path(const char *prefix, int len, const char *path)
118{
645a29c4 119 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
120 if (!r)
121 die("'%s' is outside repository", path);
122 return r;
123}
124
125int path_inside_repo(const char *prefix, const char *path)
126{
127 int len = prefix ? strlen(prefix) : 0;
645a29c4 128 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
129 if (r) {
130 free(r);
131 return 1;
132 }
133 return 0;
134}
135
c6e8c800
JH
136int check_filename(const char *prefix, const char *arg)
137{
e4da43b1 138 char *to_free = NULL;
c6e8c800
JH
139 struct stat st;
140
d51c6ee0
JK
141 if (skip_prefix(arg, ":/", &arg)) {
142 if (!*arg) /* ":/" is root dir, always exists */
4db86e8b 143 return 1;
a08cbcda 144 prefix = NULL;
42471bce
JK
145 } else if (skip_prefix(arg, ":!", &arg) ||
146 skip_prefix(arg, ":^", &arg)) {
147 if (!*arg) /* excluding everything is silly, but allowed */
148 return 1;
a08cbcda
JK
149 }
150
151 if (prefix)
152 arg = to_free = prefix_filename(prefix, arg);
153
154 if (!lstat(arg, &st)) {
e4da43b1 155 free(to_free);
c6e8c800 156 return 1; /* file exists */
e4da43b1 157 }
93dd544f 158 if (is_missing_file_error(errno)) {
e4da43b1 159 free(to_free);
c6e8c800 160 return 0; /* file does not exist */
e4da43b1 161 }
c6e8c800
JH
162 die_errno("failed to stat '%s'", arg);
163}
164
023e37c3
MM
165static void NORETURN die_verify_filename(const char *prefix,
166 const char *arg,
167 int diagnose_misspelt_rev)
009fee47 168{
023e37c3 169 if (!diagnose_misspelt_rev)
ab33a76e
VA
170 die(_("%s: no such path in the working tree.\n"
171 "Use 'git <command> -- <path>...' to specify paths that do not exist locally."),
023e37c3 172 arg);
0e539dca
JH
173 /*
174 * Saying "'(icase)foo' does not exist in the index" when the
175 * user gave us ":(icase)foo" is just stupid. A magic pathspec
176 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 177 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
178 */
179 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 180 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 181
009fee47 182 /* ... or fall back the most general message. */
ab33a76e
VA
183 die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
184 "Use '--' to separate paths from revisions, like this:\n"
185 "'git <command> [<revision>...] -- [<file>...]'"), arg);
009fee47
MM
186
187}
188
c99eddd8
JK
189/*
190 * Check for arguments that don't resolve as actual files,
191 * but which look sufficiently like pathspecs that we'll consider
192 * them such for the purposes of rev/pathspec DWIM parsing.
193 */
194static int looks_like_pathspec(const char *arg)
195{
196 /* anything with a wildcard character */
197 if (!no_wildcard(arg))
198 return 1;
199
200 /* long-form pathspec magic */
201 if (starts_with(arg, ":("))
202 return 1;
203
204 return 0;
205}
206
e23d0b4a
LT
207/*
208 * Verify a filename that we got as an argument for a pathspec
209 * entry. Note that a filename that begins with "-" never verifies
210 * as true, because even if such a filename were to exist, we want
211 * it to be preceded by the "--" marker (or we want the user to
212 * use a format like "./-filename")
023e37c3
MM
213 *
214 * The "diagnose_misspelt_rev" is used to provide a user-friendly
215 * diagnosis when dying upon finding that "name" is not a pathname.
216 * If set to 1, the diagnosis will try to diagnose "name" as an
217 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
218 * will only complain about an inexisting file.
219 *
220 * This function is typically called to check that a "file or rev"
221 * argument is unambiguous. In this case, the caller will want
222 * diagnose_misspelt_rev == 1 when verifying the first non-rev
223 * argument (which could have been a revision), and
224 * diagnose_misspelt_rev == 0 for the next ones (because we already
225 * saw a filename, there's not ambiguity anymore).
e23d0b4a 226 */
023e37c3
MM
227void verify_filename(const char *prefix,
228 const char *arg,
229 int diagnose_misspelt_rev)
e23d0b4a 230{
e23d0b4a
LT
231 if (*arg == '-')
232 die("bad flag '%s' used after filename", arg);
2cb47ab6 233 if (looks_like_pathspec(arg) || check_filename(prefix, arg))
e23d0b4a 234 return;
023e37c3 235 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
236}
237
ea92f41f
JH
238/*
239 * Opposite of the above: the command line did not have -- marker
240 * and we parsed the arg as a refname. It should not be interpretable
241 * as a filename.
242 */
243void verify_non_filename(const char *prefix, const char *arg)
244{
7ae3df8c 245 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 246 return;
ea92f41f
JH
247 if (*arg == '-')
248 return; /* flag */
c6e8c800
JH
249 if (!check_filename(prefix, arg))
250 return;
ab33a76e
VA
251 die(_("ambiguous argument '%s': both revision and filename\n"
252 "Use '--' to separate paths from revisions, like this:\n"
253 "'git <command> [<revision>...] -- [<file>...]'"), arg);
ea92f41f
JH
254}
255
31e26ebc 256int get_common_dir(struct strbuf *sb, const char *gitdir)
11f9dd71
MK
257{
258 const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
259 if (git_env_common_dir) {
260 strbuf_addstr(sb, git_env_common_dir);
261 return 1;
262 } else {
263 return get_common_dir_noenv(sb, gitdir);
264 }
265}
266
267int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)
4dc4e145
NTND
268{
269 struct strbuf data = STRBUF_INIT;
270 struct strbuf path = STRBUF_INIT;
31e26ebc 271 int ret = 0;
11f9dd71 272
4dc4e145
NTND
273 strbuf_addf(&path, "%s/commondir", gitdir);
274 if (file_exists(path.buf)) {
275 if (strbuf_read_file(&data, path.buf, 0) <= 0)
276 die_errno(_("failed to read %s"), path.buf);
277 while (data.len && (data.buf[data.len - 1] == '\n' ||
278 data.buf[data.len - 1] == '\r'))
279 data.len--;
280 data.buf[data.len] = '\0';
281 strbuf_reset(&path);
282 if (!is_absolute_path(data.buf))
283 strbuf_addf(&path, "%s/", gitdir);
284 strbuf_addbuf(&path, &data);
33ad9ddd 285 strbuf_add_real_path(sb, path.buf);
31e26ebc 286 ret = 1;
4ac9006f 287 } else {
4dc4e145 288 strbuf_addstr(sb, gitdir);
4ac9006f
BW
289 }
290
4dc4e145
NTND
291 strbuf_release(&data);
292 strbuf_release(&path);
31e26ebc 293 return ret;
4dc4e145 294}
d288a700 295
5f5608bc 296/*
ad1a382f 297 * Test if it looks like we're at a git directory.
5e7bfe25 298 * We want to see:
5f5608bc 299 *
790296fd 300 * - either an objects/ directory _or_ the proper
5f5608bc 301 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 302 * - a refs/ directory
8098a178 303 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
304 * a proper "ref:", or a regular file HEAD that has a properly
305 * formatted sha1 object name.
5f5608bc 306 */
b3256eb8 307int is_git_directory(const char *suspect)
5f5608bc 308{
1d186b6f
NTND
309 struct strbuf path = STRBUF_INIT;
310 int ret = 0;
311 size_t len;
ad1a382f 312
4dc4e145
NTND
313 /* Check worktree-related signatures */
314 strbuf_addf(&path, "%s/HEAD", suspect);
315 if (validate_headref(path.buf))
316 goto done;
317
318 strbuf_reset(&path);
319 get_common_dir(&path, suspect);
1d186b6f 320 len = path.len;
4dc4e145
NTND
321
322 /* Check non-worktree-related signatures */
ad1a382f
SP
323 if (getenv(DB_ENVIRONMENT)) {
324 if (access(getenv(DB_ENVIRONMENT), X_OK))
1d186b6f 325 goto done;
ad1a382f
SP
326 }
327 else {
4dc4e145 328 strbuf_setlen(&path, len);
1d186b6f
NTND
329 strbuf_addstr(&path, "/objects");
330 if (access(path.buf, X_OK))
331 goto done;
ad1a382f
SP
332 }
333
1d186b6f
NTND
334 strbuf_setlen(&path, len);
335 strbuf_addstr(&path, "/refs");
336 if (access(path.buf, X_OK))
337 goto done;
ad1a382f 338
1d186b6f
NTND
339 ret = 1;
340done:
341 strbuf_release(&path);
342 return ret;
5f5608bc
LT
343}
344
ffd036b1
JK
345int is_nonbare_repository_dir(struct strbuf *path)
346{
347 int ret = 0;
348 int gitfile_error;
349 size_t orig_path_len = path->len;
350 assert(orig_path_len != 0);
351 strbuf_complete(path, '/');
352 strbuf_addstr(path, ".git");
353 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
354 ret = 1;
355 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
356 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
357 ret = 1;
358 strbuf_setlen(path, orig_path_len);
359 return ret;
360}
361
68025633
JS
362int is_inside_git_dir(void)
363{
e90fdc39
JS
364 if (inside_git_dir < 0)
365 inside_git_dir = is_inside_dir(get_git_dir());
366 return inside_git_dir;
892c41b9
ML
367}
368
892c41b9
ML
369int is_inside_work_tree(void)
370{
e90fdc39
JS
371 if (inside_work_tree < 0)
372 inside_work_tree = is_inside_dir(get_git_work_tree());
373 return inside_work_tree;
892c41b9
ML
374}
375
f3fa1838
JH
376void setup_work_tree(void)
377{
354e6534
JS
378 const char *work_tree, *git_dir;
379 static int initialized = 0;
380
381 if (initialized)
382 return;
fada7674
JK
383
384 if (work_tree_config_is_bogus)
385 die("unable to set up work tree using invalid config");
386
354e6534
JS
387 work_tree = get_git_work_tree();
388 git_dir = get_git_dir();
59f0f2f3 389 if (!is_absolute_path(git_dir))
e2a57aac 390 git_dir = real_path(get_git_dir());
59f0f2f3
MH
391 if (!work_tree || chdir(work_tree))
392 die("This operation must be run in a work tree");
0ed74813
NTND
393
394 /*
395 * Make sure subsequent git processes find correct worktree
396 * if $GIT_WORK_TREE is set relative
397 */
398 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
399 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
400
41894ae3 401 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 402 initialized = 1;
59f0f2f3
MH
403}
404
2cc7c2c7 405static int check_repo_format(const char *var, const char *value, void *vdata)
31e26ebc 406{
2cc7c2c7 407 struct repository_format *data = vdata;
00a09d57
JK
408 const char *ext;
409
31e26ebc 410 if (strcmp(var, "core.repositoryformatversion") == 0)
2cc7c2c7 411 data->version = git_config_int(var, value);
00a09d57
JK
412 else if (skip_prefix(var, "extensions.", &ext)) {
413 /*
414 * record any known extensions here; otherwise,
415 * we fall through to recording it as unknown, and
416 * check_repository_format will complain
417 */
418 if (!strcmp(ext, "noop"))
419 ;
067fbd41 420 else if (!strcmp(ext, "preciousobjects"))
2cc7c2c7 421 data->precious_objects = git_config_bool(var, value);
00a09d57 422 else
2cc7c2c7 423 string_list_append(&data->unknown_extensions, ext);
652f18ee
JK
424 } else if (strcmp(var, "core.bare") == 0) {
425 data->is_bare = git_config_bool(var, value);
426 } else if (strcmp(var, "core.worktree") == 0) {
427 if (!value)
428 return config_error_nonbool(var);
429 data->work_tree = xstrdup(value);
00a09d57 430 }
31e26ebc
NTND
431 return 0;
432}
433
337e51ce 434static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 435{
7d0fb0da 436 struct strbuf sb = STRBUF_INIT;
2cc7c2c7
JK
437 struct strbuf err = STRBUF_INIT;
438 struct repository_format candidate;
652f18ee 439 int has_common;
00a09d57 440
652f18ee 441 has_common = get_common_dir(&sb, gitdir);
e61a509a 442 strbuf_addstr(&sb, "/config");
652f18ee 443 read_repository_format(&candidate, sb.buf);
2cc7c2c7 444 strbuf_release(&sb);
e61a509a 445
337e51ce 446 /*
2cc7c2c7
JK
447 * For historical use of check_repository_format() in git-init,
448 * we treat a missing config as a silent "ok", even when nongit_ok
449 * is unset.
337e51ce 450 */
2cc7c2c7
JK
451 if (candidate.version < 0)
452 return 0;
453
454 if (verify_repository_format(&candidate, &err) < 0) {
455 if (nongit_ok) {
456 warning("%s", err.buf);
457 strbuf_release(&err);
458 *nongit_ok = -1;
459 return -1;
460 }
461 die("%s", err.buf);
462 }
463
2cc7c2c7
JK
464 repository_format_precious_objects = candidate.precious_objects;
465 string_list_clear(&candidate.unknown_extensions, 0);
652f18ee
JK
466 if (!has_common) {
467 if (candidate.is_bare != -1) {
468 is_bare_repository_cfg = candidate.is_bare;
469 if (is_bare_repository_cfg == 1)
470 inside_work_tree = -1;
471 }
472 if (candidate.work_tree) {
473 free(git_work_tree_cfg);
474 git_work_tree_cfg = candidate.work_tree;
2cc7c2c7 475 inside_work_tree = -1;
652f18ee
JK
476 }
477 } else {
478 free(candidate.work_tree);
2cc7c2c7
JK
479 }
480
481 return 0;
482}
483
652f18ee 484int read_repository_format(struct repository_format *format, const char *path)
2cc7c2c7
JK
485{
486 memset(format, 0, sizeof(*format));
487 format->version = -1;
488 format->is_bare = -1;
489 string_list_init(&format->unknown_extensions, 1);
652f18ee 490 git_config_from_file(check_repo_format, path, format);
2cc7c2c7
JK
491 return format->version;
492}
493
2cc7c2c7
JK
494int verify_repository_format(const struct repository_format *format,
495 struct strbuf *err)
496{
497 if (GIT_REPO_VERSION_READ < format->version) {
274db840 498 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
2cc7c2c7
JK
499 GIT_REPO_VERSION_READ, format->version);
500 return -1;
501 }
502
503 if (format->version >= 1 && format->unknown_extensions.nr) {
00a09d57
JK
504 int i;
505
274db840 506 strbuf_addstr(err, _("unknown repository extensions found:"));
00a09d57 507
2cc7c2c7
JK
508 for (i = 0; i < format->unknown_extensions.nr; i++)
509 strbuf_addf(err, "\n\t%s",
510 format->unknown_extensions.items[i].string);
511 return -1;
00a09d57
JK
512 }
513
2cc7c2c7 514 return 0;
9459aa77
NTND
515}
516
5f29433f
SB
517void read_gitfile_error_die(int error_code, const char *path, const char *dir)
518{
519 switch (error_code) {
520 case READ_GITFILE_ERR_STAT_FAILED:
521 case READ_GITFILE_ERR_NOT_A_FILE:
522 /* non-fatal; follow return path */
523 break;
524 case READ_GITFILE_ERR_OPEN_FAILED:
525 die_errno("Error opening '%s'", path);
526 case READ_GITFILE_ERR_TOO_LARGE:
527 die("Too large to be a .git file: '%s'", path);
528 case READ_GITFILE_ERR_READ_FAILED:
529 die("Error reading %s", path);
530 case READ_GITFILE_ERR_INVALID_FORMAT:
531 die("Invalid gitfile format: %s", path);
532 case READ_GITFILE_ERR_NO_PATH:
533 die("No path in gitfile: %s", path);
534 case READ_GITFILE_ERR_NOT_A_REPO:
535 die("Not a git repository: %s", dir);
536 default:
537 die("BUG: unknown error code");
538 }
539}
540
b44ebb19
LH
541/*
542 * Try to read the location of the git directory from the .git file,
543 * return path to git directory if found.
a93bedad
EE
544 *
545 * On failure, if return_error_code is not NULL, return_error_code
546 * will be set to an error code and NULL will be returned. If
547 * return_error_code is NULL the function will die instead (for most
548 * cases).
b44ebb19 549 */
a93bedad 550const char *read_gitfile_gently(const char *path, int *return_error_code)
b44ebb19 551{
921bdd96 552 const int max_file_size = 1 << 20; /* 1MB */
a93bedad
EE
553 int error_code = 0;
554 char *buf = NULL;
555 char *dir = NULL;
40c813e0 556 const char *slash;
b44ebb19
LH
557 struct stat st;
558 int fd;
b1905aea 559 ssize_t len;
b44ebb19 560
a93bedad 561 if (stat(path, &st)) {
5c4003ca 562 /* NEEDSWORK: discern between ENOENT vs other errors */
a93bedad
EE
563 error_code = READ_GITFILE_ERR_STAT_FAILED;
564 goto cleanup_return;
565 }
566 if (!S_ISREG(st.st_mode)) {
567 error_code = READ_GITFILE_ERR_NOT_A_FILE;
568 goto cleanup_return;
569 }
921bdd96
EE
570 if (st.st_size > max_file_size) {
571 error_code = READ_GITFILE_ERR_TOO_LARGE;
572 goto cleanup_return;
573 }
b44ebb19 574 fd = open(path, O_RDONLY);
a93bedad
EE
575 if (fd < 0) {
576 error_code = READ_GITFILE_ERR_OPEN_FAILED;
577 goto cleanup_return;
578 }
3733e694 579 buf = xmallocz(st.st_size);
b44ebb19
LH
580 len = read_in_full(fd, buf, st.st_size);
581 close(fd);
a93bedad
EE
582 if (len != st.st_size) {
583 error_code = READ_GITFILE_ERR_READ_FAILED;
584 goto cleanup_return;
585 }
a93bedad
EE
586 if (!starts_with(buf, "gitdir: ")) {
587 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
588 goto cleanup_return;
589 }
b44ebb19
LH
590 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
591 len--;
a93bedad
EE
592 if (len < 9) {
593 error_code = READ_GITFILE_ERR_NO_PATH;
594 goto cleanup_return;
595 }
b44ebb19 596 buf[len] = '\0';
40c813e0
BK
597 dir = buf + 8;
598
599 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
600 size_t pathlen = slash+1 - path;
75faa45a
JK
601 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
602 (int)(len - 8), buf + 8);
40c813e0
BK
603 free(buf);
604 buf = dir;
605 }
a93bedad
EE
606 if (!is_git_directory(dir)) {
607 error_code = READ_GITFILE_ERR_NOT_A_REPO;
608 goto cleanup_return;
609 }
e2a57aac 610 path = real_path(dir);
40c813e0 611
a93bedad 612cleanup_return:
a93bedad
EE
613 if (return_error_code)
614 *return_error_code = error_code;
5f29433f
SB
615 else if (error_code)
616 read_gitfile_error_die(error_code, path, dir);
a93bedad 617
b44ebb19 618 free(buf);
38ae8784 619 return error_code ? NULL : path;
b44ebb19
LH
620}
621
e4e30347 622static const char *setup_explicit_git_dir(const char *gitdirenv,
7333ed17 623 struct strbuf *cwd,
b3f66fd3 624 int *nongit_ok)
e4e30347 625{
b3f66fd3
NTND
626 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
627 const char *worktree;
628 char *gitfile;
9b125da4 629 int offset;
e4e30347
JN
630
631 if (PATH_MAX - 40 < strlen(gitdirenv))
632 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 633
13d6ec91 634 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
635 if (gitfile) {
636 gitfile = xstrdup(gitfile);
637 gitdirenv = gitfile;
638 }
639
e4e30347
JN
640 if (!is_git_directory(gitdirenv)) {
641 if (nongit_ok) {
642 *nongit_ok = 1;
b3f66fd3 643 free(gitfile);
e4e30347
JN
644 return NULL;
645 }
646 die("Not a git repository: '%s'", gitdirenv);
647 }
b3f66fd3
NTND
648
649 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
650 free(gitfile);
651 return NULL;
e4e30347 652 }
b3f66fd3
NTND
653
654 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
655 if (work_tree_env)
656 set_git_work_tree(work_tree_env);
657 else if (is_bare_repository_cfg > 0) {
fada7674
JK
658 if (git_work_tree_cfg) {
659 /* #22.2, #30 */
660 warning("core.bare and core.worktree do not make sense");
661 work_tree_config_is_bogus = 1;
662 }
b3f66fd3
NTND
663
664 /* #18, #26 */
665 set_git_dir(gitdirenv);
666 free(gitfile);
e4e30347 667 return NULL;
b3f66fd3
NTND
668 }
669 else if (git_work_tree_cfg) { /* #6, #14 */
670 if (is_absolute_path(git_work_tree_cfg))
671 set_git_work_tree(git_work_tree_cfg);
672 else {
56b9f6e7 673 char *core_worktree;
b3f66fd3
NTND
674 if (chdir(gitdirenv))
675 die_errno("Could not chdir to '%s'", gitdirenv);
676 if (chdir(git_work_tree_cfg))
677 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
56b9f6e7 678 core_worktree = xgetcwd();
7333ed17 679 if (chdir(cwd->buf))
b3f66fd3
NTND
680 die_errno("Could not come back to cwd");
681 set_git_work_tree(core_worktree);
56b9f6e7 682 free(core_worktree);
b3f66fd3
NTND
683 }
684 }
2cd83d10
JK
685 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
686 /* #16d */
687 set_git_dir(gitdirenv);
688 free(gitfile);
689 return NULL;
690 }
b3f66fd3
NTND
691 else /* #2, #10 */
692 set_git_work_tree(".");
693
694 /* set_git_work_tree() must have been called by now */
695 worktree = get_git_work_tree();
696
697 /* both get_git_work_tree() and cwd are already normalized */
7333ed17 698 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
b3f66fd3
NTND
699 set_git_dir(gitdirenv);
700 free(gitfile);
e4e30347 701 return NULL;
b3f66fd3 702 }
e4e30347 703
7333ed17 704 offset = dir_inside_of(cwd->buf, worktree);
9b125da4 705 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 706 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
707 if (chdir(worktree))
708 die_errno("Could not chdir to '%s'", worktree);
7333ed17 709 strbuf_addch(cwd, '/');
b3f66fd3 710 free(gitfile);
7333ed17 711 return cwd->buf + offset;
93a00542 712 }
b3f66fd3
NTND
713
714 /* cwd outside worktree */
715 set_git_dir(gitdirenv);
716 free(gitfile);
717 return NULL;
93a00542
JN
718}
719
9951d3b3 720static const char *setup_discovered_git_dir(const char *gitdir,
7333ed17 721 struct strbuf *cwd, int offset,
9951d3b3 722 int *nongit_ok)
98937bef 723{
9951d3b3
NTND
724 if (check_repository_format_gently(gitdir, nongit_ok))
725 return NULL;
98937bef 726
4868b2ea
JN
727 /* --work-tree is set without --git-dir; use discovered one */
728 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
2d4dcf21
JS
729 char *to_free = NULL;
730 const char *ret;
731
7333ed17 732 if (offset != cwd->len && !is_absolute_path(gitdir))
2d4dcf21 733 gitdir = to_free = real_pathdup(gitdir, 1);
7333ed17 734 if (chdir(cwd->buf))
4868b2ea 735 die_errno("Could not come back to cwd");
2d4dcf21
JS
736 ret = setup_explicit_git_dir(gitdir, cwd, nongit_ok);
737 free(to_free);
738 return ret;
4868b2ea
JN
739 }
740
9951d3b3
NTND
741 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
742 if (is_bare_repository_cfg > 0) {
7333ed17
RS
743 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
744 if (chdir(cwd->buf))
9951d3b3 745 die_errno("Could not come back to cwd");
98937bef 746 return NULL;
9951d3b3 747 }
98937bef 748
9951d3b3
NTND
749 /* #0, #1, #5, #8, #9, #12, #13 */
750 set_git_work_tree(".");
751 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
752 set_git_dir(gitdir);
98937bef 753 inside_git_dir = 0;
9951d3b3 754 inside_work_tree = 1;
7333ed17 755 if (offset == cwd->len)
98937bef
NTND
756 return NULL;
757
df380d58
JS
758 /* Make "offset" point past the '/' (already the case for root dirs) */
759 if (offset != offset_1st_component(cwd->buf))
760 offset++;
761 /* Add a '/' at the end */
7333ed17
RS
762 strbuf_addch(cwd, '/');
763 return cwd->buf + offset;
98937bef
NTND
764}
765
1cd8031b 766/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
7333ed17
RS
767static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
768 int *nongit_ok)
68698da5
JN
769{
770 int root_len;
771
1cd8031b
NTND
772 if (check_repository_format_gently(".", nongit_ok))
773 return NULL;
774
2cd83d10
JK
775 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
776
4868b2ea
JN
777 /* --work-tree is set without --git-dir; use discovered one */
778 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
da6f8475 779 static const char *gitdir;
4868b2ea 780
7333ed17
RS
781 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
782 if (chdir(cwd->buf))
4868b2ea 783 die_errno("Could not come back to cwd");
7333ed17 784 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
785 }
786
68698da5 787 inside_git_dir = 1;
1cd8031b 788 inside_work_tree = 0;
7333ed17
RS
789 if (offset != cwd->len) {
790 if (chdir(cwd->buf))
8fc0ae80 791 die_errno("Cannot come back to cwd");
7333ed17
RS
792 root_len = offset_1st_component(cwd->buf);
793 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
794 set_git_dir(cwd->buf);
337e51ce 795 }
1cd8031b 796 else
68698da5 797 set_git_dir(".");
68698da5
JN
798 return NULL;
799}
800
f161edeb
JN
801static const char *setup_nongit(const char *cwd, int *nongit_ok)
802{
803 if (!nongit_ok)
2ff30e67 804 die(_("Not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
f161edeb 805 if (chdir(cwd))
2ff30e67 806 die_errno(_("Cannot come back to cwd"));
f161edeb
JN
807 *nongit_ok = 1;
808 return NULL;
809}
810
2565b43b 811static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
812{
813 struct stat buf;
2565b43b
CB
814 if (stat(path, &buf)) {
815 die_errno("failed to stat '%*s%s%s'",
816 prefix_len,
60c98d1e
JN
817 prefix ? prefix : "",
818 prefix ? "/" : "", path);
2565b43b 819 }
60c98d1e
JN
820 return buf.st_dev;
821}
822
9e2326c7 823/*
1b77d83c
MH
824 * A "string_list_each_func_t" function that canonicalizes an entry
825 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
826 * discards it if unusable. The presence of an empty entry in
827 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
828 * subsequent entries.
9e2326c7 829 */
1b77d83c 830static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 831 void *cb_data)
9e2326c7 832{
7ec30aaa 833 int *empty_entry_found = cb_data;
1b77d83c 834 char *ceil = item->string;
9e2326c7 835
7ec30aaa
MH
836 if (!*ceil) {
837 *empty_entry_found = 1;
9e2326c7 838 return 0;
7ec30aaa 839 } else if (!is_absolute_path(ceil)) {
9e2326c7 840 return 0;
7ec30aaa
MH
841 } else if (*empty_entry_found) {
842 /* Keep entry but do not canonicalize it */
843 return 1;
844 } else {
ce83eadd 845 char *real_path = real_pathdup(ceil, 0);
4ac9006f 846 if (!real_path) {
7ec30aaa 847 return 0;
4ac9006f 848 }
7ec30aaa 849 free(item->string);
4ac9006f 850 item->string = real_path;
7ec30aaa
MH
851 return 1;
852 }
9e2326c7
MH
853}
854
ce9b8aab
JS
855enum discovery_result {
856 GIT_DIR_NONE = 0,
857 GIT_DIR_EXPLICIT,
858 GIT_DIR_DISCOVERED,
859 GIT_DIR_BARE,
860 /* these are errors */
861 GIT_DIR_HIT_CEILING = -1,
01017dce
JS
862 GIT_DIR_HIT_MOUNT_POINT = -2,
863 GIT_DIR_INVALID_GITFILE = -3
ce9b8aab
JS
864};
865
e90fdc39
JS
866/*
867 * We cannot decide in this function whether we are in the work tree or
868 * not, since the config can only be read _after_ this function was called.
ce9b8aab
JS
869 *
870 * Also, we avoid changing any global state (such as the current working
871 * directory) to allow early callers.
872 *
873 * The directory where the search should start needs to be passed in via the
874 * `dir` parameter; upon return, the `dir` buffer will contain the path of
875 * the directory where the search ended, and `gitdir` will contain the path of
876 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it
877 * is relative to `dir` (i.e. *not* necessarily the cwd).
e90fdc39 878 */
ce9b8aab 879static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
01017dce
JS
880 struct strbuf *gitdir,
881 int die_on_error)
d288a700 882{
0454dd93 883 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 884 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
ce9b8aab
JS
885 const char *gitdirenv;
886 int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1;
c7d1d1b1
RH
887 dev_t current_device = 0;
888 int one_filesystem = 1;
d288a700 889
e90fdc39
JS
890 /*
891 * If GIT_DIR is set explicitly, we're not going
892 * to do any discovery, but we still do repository
893 * validation.
894 */
ad1a382f 895 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
ce9b8aab
JS
896 if (gitdirenv) {
897 strbuf_addstr(gitdir, gitdirenv);
898 return GIT_DIR_EXPLICIT;
899 }
d288a700 900
31171d9e 901 if (env_ceiling_dirs) {
7ec30aaa
MH
902 int empty_entry_found = 0;
903
31171d9e 904 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 905 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 906 canonicalize_ceiling_entry, &empty_entry_found);
ce9b8aab 907 ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs);
31171d9e
MH
908 string_list_clear(&ceiling_dirs, 0);
909 }
910
ce9b8aab
JS
911 if (ceil_offset < 0)
912 ceil_offset = min_offset - 2;
d288a700 913
892c41b9 914 /*
ce9b8aab 915 * Test in the following order (relative to the dir):
b44ebb19 916 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
917 * - .git/
918 * - ./ (bare)
b44ebb19 919 * - ../.git
e90fdc39
JS
920 * - ../.git/
921 * - ../ (bare)
922 * - ../../.git/
923 * etc.
892c41b9 924 */
cf87463e 925 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 926 if (one_filesystem)
ce9b8aab 927 current_device = get_device_or_die(dir->buf, NULL, 0);
e90fdc39 928 for (;;) {
01017dce 929 int offset = dir->len, error_code = 0;
ce9b8aab
JS
930
931 if (offset > min_offset)
932 strbuf_addch(dir, '/');
933 strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
01017dce
JS
934 gitdirenv = read_gitfile_gently(dir->buf, die_on_error ?
935 NULL : &error_code);
936 if (!gitdirenv) {
937 if (die_on_error ||
938 error_code == READ_GITFILE_ERR_NOT_A_FILE) {
5c4003ca 939 /* NEEDSWORK: fail if .git is not file nor dir */
01017dce
JS
940 if (is_git_directory(dir->buf))
941 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
942 } else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
943 return GIT_DIR_INVALID_GITFILE;
9951d3b3 944 }
ce9b8aab 945 strbuf_setlen(dir, offset);
9951d3b3 946 if (gitdirenv) {
ce9b8aab
JS
947 strbuf_addstr(gitdir, gitdirenv);
948 return GIT_DIR_DISCOVERED;
9951d3b3 949 }
9951d3b3 950
ce9b8aab
JS
951 if (is_git_directory(dir->buf)) {
952 strbuf_addstr(gitdir, ".");
953 return GIT_DIR_BARE;
502ffe34 954 }
9951d3b3 955
ce9b8aab
JS
956 if (offset <= min_offset)
957 return GIT_DIR_HIT_CEILING;
1cd8031b 958
ce9b8aab 959 while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset]))
6c1e6544 960 ; /* continue */
ce9b8aab
JS
961 if (offset <= ceil_offset)
962 return GIT_DIR_HIT_CEILING;
963
964 strbuf_setlen(dir, offset > min_offset ? offset : min_offset);
965 if (one_filesystem &&
966 current_device != get_device_or_die(dir->buf, NULL, offset))
967 return GIT_DIR_HIT_MOUNT_POINT;
892c41b9 968 }
d288a700 969}
5e7bfe25 970
d3fb71b3
BW
971int discover_git_directory(struct strbuf *commondir,
972 struct strbuf *gitdir)
16ac8b8d
JS
973{
974 struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
975 size_t gitdir_offset = gitdir->len, cwd_len;
d3fb71b3 976 size_t commondir_offset = commondir->len;
16ac8b8d
JS
977 struct repository_format candidate;
978
979 if (strbuf_getcwd(&dir))
d3fb71b3 980 return -1;
16ac8b8d
JS
981
982 cwd_len = dir.len;
01017dce 983 if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) {
16ac8b8d 984 strbuf_release(&dir);
d3fb71b3 985 return -1;
16ac8b8d
JS
986 }
987
988 /*
989 * The returned gitdir is relative to dir, and if dir does not reflect
990 * the current working directory, we simply make the gitdir absolute.
991 */
992 if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) {
993 /* Avoid a trailing "/." */
994 if (!strcmp(".", gitdir->buf + gitdir_offset))
995 strbuf_setlen(gitdir, gitdir_offset);
996 else
997 strbuf_addch(&dir, '/');
998 strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
999 }
1000
d3fb71b3
BW
1001 get_common_dir(commondir, gitdir->buf + gitdir_offset);
1002
16ac8b8d 1003 strbuf_reset(&dir);
d3fb71b3 1004 strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset);
16ac8b8d
JS
1005 read_repository_format(&candidate, dir.buf);
1006 strbuf_release(&dir);
1007
1008 if (verify_repository_format(&candidate, &err) < 0) {
1009 warning("ignoring git dir '%s': %s",
1010 gitdir->buf + gitdir_offset, err.buf);
1011 strbuf_release(&err);
d3fb71b3 1012 strbuf_setlen(commondir, commondir_offset);
69743f9b 1013 strbuf_setlen(gitdir, gitdir_offset);
d3fb71b3 1014 return -1;
16ac8b8d
JS
1015 }
1016
d3fb71b3 1017 return 0;
16ac8b8d
JS
1018}
1019
a60645f9
NTND
1020const char *setup_git_directory_gently(int *nongit_ok)
1021{
ce9b8aab
JS
1022 static struct strbuf cwd = STRBUF_INIT;
1023 struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
b58a68c1 1024 const char *prefix, *env_prefix;
a60645f9 1025
ce9b8aab
JS
1026 /*
1027 * We may have read an incomplete configuration before
1028 * setting-up the git directory. If so, clear the cache so
1029 * that the next queries to the configuration reload complete
1030 * configuration (including the per-repo config file that we
1031 * ignored previously).
1032 */
1033 git_config_clear();
1034
1035 /*
1036 * Let's assume that we are in a git repository.
1037 * If it turns out later that we are somewhere else, the value will be
1038 * updated accordingly.
1039 */
1040 if (nongit_ok)
1041 *nongit_ok = 0;
1042
1043 if (strbuf_getcwd(&cwd))
1044 die_errno(_("Unable to read current working directory"));
1045 strbuf_addbuf(&dir, &cwd);
1046
01017dce 1047 switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) {
ce9b8aab
JS
1048 case GIT_DIR_NONE:
1049 prefix = NULL;
1050 break;
1051 case GIT_DIR_EXPLICIT:
1052 prefix = setup_explicit_git_dir(gitdir.buf, &cwd, nongit_ok);
1053 break;
1054 case GIT_DIR_DISCOVERED:
1055 if (dir.len < cwd.len && chdir(dir.buf))
1056 die(_("Cannot change to '%s'"), dir.buf);
1057 prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
1058 nongit_ok);
1059 break;
1060 case GIT_DIR_BARE:
1061 if (dir.len < cwd.len && chdir(dir.buf))
1062 die(_("Cannot change to '%s'"), dir.buf);
1063 prefix = setup_bare_git_dir(&cwd, dir.len, nongit_ok);
1064 break;
1065 case GIT_DIR_HIT_CEILING:
1066 prefix = setup_nongit(cwd.buf, nongit_ok);
1067 break;
1068 case GIT_DIR_HIT_MOUNT_POINT:
1069 if (nongit_ok) {
1070 *nongit_ok = 1;
1071 strbuf_release(&cwd);
1072 strbuf_release(&dir);
1073 return NULL;
1074 }
1075 die(_("Not a git repository (or any parent up to mount point %s)\n"
1076 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
1077 dir.buf);
1078 default:
1079 die("BUG: unhandled setup_git_directory_1() result");
1080 }
1081
7aee274f
BW
1082 /*
1083 * NEEDSWORK: This was a hack in order to get ls-files and grep to have
1084 * properly formated output when recursing submodules. Once ls-files
1085 * and grep have been changed to perform this recursing in-process this
1086 * needs to be removed.
1087 */
3736c925 1088 env_prefix = getenv(GIT_TOPLEVEL_PREFIX_ENVIRONMENT);
b58a68c1
BW
1089 if (env_prefix)
1090 prefix = env_prefix;
1091
1f5d271f 1092 if (prefix)
a6f7f9a3 1093 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 1094 else
a6f7f9a3 1095 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 1096
46c3cd44
JK
1097 startup_info->have_repository = !nongit_ok || !*nongit_ok;
1098 startup_info->prefix = prefix;
1099
73f192c9
BW
1100 /*
1101 * Not all paths through the setup code will call 'set_git_dir()' (which
1102 * directly sets up the environment) so in order to guarantee that the
1103 * environment is in a consistent state after setup, explicitly setup
1104 * the environment if we have a repository.
1105 *
1106 * NEEDSWORK: currently we allow bogus GIT_DIR values to be set in some
1107 * code paths so we also need to explicitly setup the environment if
1108 * the user has set GIT_DIR. It may be beneficial to disallow bogus
1109 * GIT_DIR values at some point in the future.
1110 */
1111 if (startup_info->have_repository || getenv(GIT_DIR_ENVIRONMENT))
1112 setup_git_env();
1113
ce9b8aab
JS
1114 strbuf_release(&dir);
1115 strbuf_release(&gitdir);
1116
a60645f9
NTND
1117 return prefix;
1118}
1119
94df2506
JH
1120int git_config_perm(const char *var, const char *value)
1121{
06cbe855
HO
1122 int i;
1123 char *endptr;
1124
1125 if (value == NULL)
1126 return PERM_GROUP;
1127
1128 if (!strcmp(value, "umask"))
1129 return PERM_UMASK;
1130 if (!strcmp(value, "group"))
1131 return PERM_GROUP;
1132 if (!strcmp(value, "all") ||
1133 !strcmp(value, "world") ||
1134 !strcmp(value, "everybody"))
1135 return PERM_EVERYBODY;
1136
1137 /* Parse octal numbers */
1138 i = strtol(value, &endptr, 8);
1139
1140 /* If not an octal number, maybe true/false? */
1141 if (*endptr != 0)
1142 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
1143
1144 /*
1145 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 1146 * a chmod value to restrict to.
06cbe855
HO
1147 */
1148 switch (i) {
1149 case PERM_UMASK: /* 0 */
1150 return PERM_UMASK;
1151 case OLD_PERM_GROUP: /* 1 */
1152 return PERM_GROUP;
1153 case OLD_PERM_EVERYBODY: /* 2 */
1154 return PERM_EVERYBODY;
94df2506 1155 }
06cbe855
HO
1156
1157 /* A filemode value was given: 0xxx */
1158
1159 if ((i & 0600) != 0600)
2ff30e67 1160 die(_("Problem with core.sharedRepository filemode value "
06cbe855 1161 "(0%.3o).\nThe owner of files must always have "
2ff30e67 1162 "read and write permissions."), i);
06cbe855
HO
1163
1164 /*
1165 * Mask filemode value. Others can not get write permission.
1166 * x flags for directories are handled separately.
1167 */
5a688fe4 1168 return -(i & 0666);
94df2506
JH
1169}
1170
4b0d1eeb 1171void check_repository_format(void)
ab9cb76f 1172{
f1c126bd
JK
1173 check_repository_format_gently(get_git_dir(), NULL);
1174 startup_info->have_repository = 1;
ab9cb76f
JH
1175}
1176
e1e5ec86
CB
1177/*
1178 * Returns the "prefix", a path to the current working directory
1179 * relative to the work tree root, or NULL, if the current working
1180 * directory is not a strict subdirectory of the work tree root. The
1181 * prefix always ends with a '/' character.
1182 */
5e7bfe25
JH
1183const char *setup_git_directory(void)
1184{
b3f66fd3 1185 return setup_git_directory_gently(NULL);
5e7bfe25 1186}
abc06822 1187
40d96325 1188const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
abc06822
FG
1189{
1190 if (is_git_directory(suspect))
1191 return suspect;
40d96325 1192 return read_gitfile_gently(suspect, return_error_code);
abc06822 1193}
1d999ddd
TR
1194
1195/* if any standard file descriptor is missing open it to /dev/null */
1196void sanitize_stdfds(void)
1197{
1198 int fd = open("/dev/null", O_RDWR, 0);
1199 while (fd != -1 && fd < 2)
1200 fd = dup(fd);
1201 if (fd == -1)
1202 die_errno("open /dev/null or dup failed");
1203 if (fd > 2)
1204 close(fd);
1205}
de0957ce
NTND
1206
1207int daemonize(void)
1208{
1209#ifdef NO_POSIX_GOODIES
1210 errno = ENOSYS;
1211 return -1;
1212#else
1213 switch (fork()) {
1214 case 0:
1215 break;
1216 case -1:
1217 die_errno("fork failed");
1218 default:
1219 exit(0);
1220 }
1221 if (setsid() == -1)
1222 die_errno("setsid failed");
1223 close(0);
1224 close(1);
1225 close(2);
1226 sanitize_stdfds();
1227 return 0;
1228#endif
1229}