check_filename(): handle ":^" path magic
[git/git.git] / setup.c
CommitLineData
d288a700 1#include "cache.h"
e90fdc39 2#include "dir.h"
31171d9e 3#include "string-list.h"
e90fdc39
JS
4
5static int inside_git_dir = -1;
6static int inside_work_tree = -1;
fada7674 7static int work_tree_config_is_bogus;
d288a700 8
46c3cd44
JK
9static struct startup_info the_startup_info;
10struct startup_info *startup_info = &the_startup_info;
11
ddc2a628
MEW
12/*
13 * The input parameter must contain an absolute path, and it must already be
14 * normalized.
15 *
16 * Find the part of an absolute path that lies inside the work tree by
17 * dereferencing symlinks outside the work tree, for example:
18 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
19 * /dir/file (work tree is /) -> dir/file
20 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
21 * /dir/repolink/file (repolink points to /dir/repo) -> file
22 * /dir/repo (exactly equal to work tree) -> (empty string)
23 */
24static int abspath_part_inside_repo(char *path)
25{
26 size_t len;
27 size_t wtlen;
28 char *path0;
29 int off;
30 const char *work_tree = get_git_work_tree();
31
32 if (!work_tree)
33 return -1;
34 wtlen = strlen(work_tree);
35 len = strlen(path);
6127ff63 36 off = offset_1st_component(path);
ddc2a628
MEW
37
38 /* check if work tree is already the prefix */
39 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
40 if (path[wtlen] == '/') {
41 memmove(path, path + wtlen + 1, len - wtlen);
42 return 0;
43 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
44 /* work tree is the root, or the whole path */
45 memmove(path, path + wtlen, len - wtlen + 1);
46 return 0;
47 }
48 /* work tree might match beginning of a symlink to work tree */
49 off = wtlen;
50 }
51 path0 = path;
6127ff63 52 path += off;
ddc2a628
MEW
53
54 /* check each '/'-terminated level */
55 while (*path) {
56 path++;
57 if (*path == '/') {
58 *path = '\0';
59 if (strcmp(real_path(path0), work_tree) == 0) {
60 memmove(path0, path + 1, len - (path - path0));
61 return 0;
62 }
63 *path = '/';
64 }
65 }
66
67 /* check whole path */
68 if (strcmp(real_path(path0), work_tree) == 0) {
69 *path0 = '\0';
70 return 0;
71 }
72
73 return -1;
74}
75
645a29c4
NTND
76/*
77 * Normalize "path", prepending the "prefix" for relative paths. If
78 * remaining_prefix is not NULL, return the actual prefix still
79 * remains in the path. For example, prefix = sub1/sub2/ and path is
80 *
81 * foo -> sub1/sub2/foo (full prefix)
82 * ../foo -> sub1/foo (remaining prefix is sub1/)
83 * ../../bar -> bar (no remaining prefix)
84 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
85 * `pwd`/../bar -> sub1/bar (no remaining prefix)
86 */
87char *prefix_path_gently(const char *prefix, int len,
88 int *remaining_prefix, const char *path)
d089ebaa
JH
89{
90 const char *orig = path;
18e051a3
CMAB
91 char *sanitized;
92 if (is_absolute_path(orig)) {
3733e694 93 sanitized = xmallocz(strlen(path));
645a29c4
NTND
94 if (remaining_prefix)
95 *remaining_prefix = 0;
655ee9ea
MEW
96 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
97 free(sanitized);
98 return NULL;
99 }
100 if (abspath_part_inside_repo(sanitized)) {
101 free(sanitized);
102 return NULL;
103 }
18e051a3 104 } else {
24041d6b 105 sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path);
645a29c4
NTND
106 if (remaining_prefix)
107 *remaining_prefix = len;
655ee9ea 108 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
546e0fd9
JK
109 free(sanitized);
110 return NULL;
d089ebaa 111 }
d089ebaa
JH
112 }
113 return sanitized;
f332726e
LT
114}
115
546e0fd9
JK
116char *prefix_path(const char *prefix, int len, const char *path)
117{
645a29c4 118 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
119 if (!r)
120 die("'%s' is outside repository", path);
121 return r;
122}
123
124int path_inside_repo(const char *prefix, const char *path)
125{
126 int len = prefix ? strlen(prefix) : 0;
645a29c4 127 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
128 if (r) {
129 free(r);
130 return 1;
131 }
132 return 0;
133}
134
c6e8c800
JH
135int check_filename(const char *prefix, const char *arg)
136{
e4da43b1 137 char *to_free = NULL;
c6e8c800
JH
138 struct stat st;
139
d51c6ee0
JK
140 if (skip_prefix(arg, ":/", &arg)) {
141 if (!*arg) /* ":/" is root dir, always exists */
4db86e8b 142 return 1;
a08cbcda 143 prefix = NULL;
42471bce
JK
144 } else if (skip_prefix(arg, ":!", &arg) ||
145 skip_prefix(arg, ":^", &arg)) {
146 if (!*arg) /* excluding everything is silly, but allowed */
147 return 1;
a08cbcda
JK
148 }
149
150 if (prefix)
151 arg = to_free = prefix_filename(prefix, arg);
152
153 if (!lstat(arg, &st)) {
e4da43b1 154 free(to_free);
c6e8c800 155 return 1; /* file exists */
e4da43b1
JK
156 }
157 if (errno == ENOENT || errno == ENOTDIR) {
158 free(to_free);
c6e8c800 159 return 0; /* file does not exist */
e4da43b1 160 }
c6e8c800
JH
161 die_errno("failed to stat '%s'", arg);
162}
163
023e37c3
MM
164static void NORETURN die_verify_filename(const char *prefix,
165 const char *arg,
166 int diagnose_misspelt_rev)
009fee47 167{
023e37c3 168 if (!diagnose_misspelt_rev)
ab33a76e
VA
169 die(_("%s: no such path in the working tree.\n"
170 "Use 'git <command> -- <path>...' to specify paths that do not exist locally."),
023e37c3 171 arg);
0e539dca
JH
172 /*
173 * Saying "'(icase)foo' does not exist in the index" when the
174 * user gave us ":(icase)foo" is just stupid. A magic pathspec
175 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 176 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
177 */
178 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 179 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 180
009fee47 181 /* ... or fall back the most general message. */
ab33a76e
VA
182 die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
183 "Use '--' to separate paths from revisions, like this:\n"
184 "'git <command> [<revision>...] -- [<file>...]'"), arg);
009fee47
MM
185
186}
187
e23d0b4a
LT
188/*
189 * Verify a filename that we got as an argument for a pathspec
190 * entry. Note that a filename that begins with "-" never verifies
191 * as true, because even if such a filename were to exist, we want
192 * it to be preceded by the "--" marker (or we want the user to
193 * use a format like "./-filename")
023e37c3
MM
194 *
195 * The "diagnose_misspelt_rev" is used to provide a user-friendly
196 * diagnosis when dying upon finding that "name" is not a pathname.
197 * If set to 1, the diagnosis will try to diagnose "name" as an
198 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
199 * will only complain about an inexisting file.
200 *
201 * This function is typically called to check that a "file or rev"
202 * argument is unambiguous. In this case, the caller will want
203 * diagnose_misspelt_rev == 1 when verifying the first non-rev
204 * argument (which could have been a revision), and
205 * diagnose_misspelt_rev == 0 for the next ones (because we already
206 * saw a filename, there's not ambiguity anymore).
e23d0b4a 207 */
023e37c3
MM
208void verify_filename(const char *prefix,
209 const char *arg,
210 int diagnose_misspelt_rev)
e23d0b4a 211{
e23d0b4a
LT
212 if (*arg == '-')
213 die("bad flag '%s' used after filename", arg);
df714f81 214 if (check_filename(prefix, arg) || !no_wildcard(arg))
e23d0b4a 215 return;
023e37c3 216 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
217}
218
ea92f41f
JH
219/*
220 * Opposite of the above: the command line did not have -- marker
221 * and we parsed the arg as a refname. It should not be interpretable
222 * as a filename.
223 */
224void verify_non_filename(const char *prefix, const char *arg)
225{
7ae3df8c 226 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 227 return;
ea92f41f
JH
228 if (*arg == '-')
229 return; /* flag */
c6e8c800
JH
230 if (!check_filename(prefix, arg))
231 return;
ab33a76e
VA
232 die(_("ambiguous argument '%s': both revision and filename\n"
233 "Use '--' to separate paths from revisions, like this:\n"
234 "'git <command> [<revision>...] -- [<file>...]'"), arg);
ea92f41f
JH
235}
236
31e26ebc 237int get_common_dir(struct strbuf *sb, const char *gitdir)
11f9dd71
MK
238{
239 const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
240 if (git_env_common_dir) {
241 strbuf_addstr(sb, git_env_common_dir);
242 return 1;
243 } else {
244 return get_common_dir_noenv(sb, gitdir);
245 }
246}
247
248int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)
4dc4e145
NTND
249{
250 struct strbuf data = STRBUF_INIT;
251 struct strbuf path = STRBUF_INIT;
31e26ebc 252 int ret = 0;
11f9dd71 253
4dc4e145
NTND
254 strbuf_addf(&path, "%s/commondir", gitdir);
255 if (file_exists(path.buf)) {
256 if (strbuf_read_file(&data, path.buf, 0) <= 0)
257 die_errno(_("failed to read %s"), path.buf);
258 while (data.len && (data.buf[data.len - 1] == '\n' ||
259 data.buf[data.len - 1] == '\r'))
260 data.len--;
261 data.buf[data.len] = '\0';
262 strbuf_reset(&path);
263 if (!is_absolute_path(data.buf))
264 strbuf_addf(&path, "%s/", gitdir);
265 strbuf_addbuf(&path, &data);
33ad9ddd 266 strbuf_add_real_path(sb, path.buf);
31e26ebc 267 ret = 1;
4ac9006f 268 } else {
4dc4e145 269 strbuf_addstr(sb, gitdir);
4ac9006f
BW
270 }
271
4dc4e145
NTND
272 strbuf_release(&data);
273 strbuf_release(&path);
31e26ebc 274 return ret;
4dc4e145 275}
d288a700 276
5f5608bc 277/*
ad1a382f 278 * Test if it looks like we're at a git directory.
5e7bfe25 279 * We want to see:
5f5608bc 280 *
790296fd 281 * - either an objects/ directory _or_ the proper
5f5608bc 282 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 283 * - a refs/ directory
8098a178 284 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
285 * a proper "ref:", or a regular file HEAD that has a properly
286 * formatted sha1 object name.
5f5608bc 287 */
b3256eb8 288int is_git_directory(const char *suspect)
5f5608bc 289{
1d186b6f
NTND
290 struct strbuf path = STRBUF_INIT;
291 int ret = 0;
292 size_t len;
ad1a382f 293
4dc4e145
NTND
294 /* Check worktree-related signatures */
295 strbuf_addf(&path, "%s/HEAD", suspect);
296 if (validate_headref(path.buf))
297 goto done;
298
299 strbuf_reset(&path);
300 get_common_dir(&path, suspect);
1d186b6f 301 len = path.len;
4dc4e145
NTND
302
303 /* Check non-worktree-related signatures */
ad1a382f
SP
304 if (getenv(DB_ENVIRONMENT)) {
305 if (access(getenv(DB_ENVIRONMENT), X_OK))
1d186b6f 306 goto done;
ad1a382f
SP
307 }
308 else {
4dc4e145 309 strbuf_setlen(&path, len);
1d186b6f
NTND
310 strbuf_addstr(&path, "/objects");
311 if (access(path.buf, X_OK))
312 goto done;
ad1a382f
SP
313 }
314
1d186b6f
NTND
315 strbuf_setlen(&path, len);
316 strbuf_addstr(&path, "/refs");
317 if (access(path.buf, X_OK))
318 goto done;
ad1a382f 319
1d186b6f
NTND
320 ret = 1;
321done:
322 strbuf_release(&path);
323 return ret;
5f5608bc
LT
324}
325
ffd036b1
JK
326int is_nonbare_repository_dir(struct strbuf *path)
327{
328 int ret = 0;
329 int gitfile_error;
330 size_t orig_path_len = path->len;
331 assert(orig_path_len != 0);
332 strbuf_complete(path, '/');
333 strbuf_addstr(path, ".git");
334 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
335 ret = 1;
336 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
337 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
338 ret = 1;
339 strbuf_setlen(path, orig_path_len);
340 return ret;
341}
342
68025633
JS
343int is_inside_git_dir(void)
344{
e90fdc39
JS
345 if (inside_git_dir < 0)
346 inside_git_dir = is_inside_dir(get_git_dir());
347 return inside_git_dir;
892c41b9
ML
348}
349
892c41b9
ML
350int is_inside_work_tree(void)
351{
e90fdc39
JS
352 if (inside_work_tree < 0)
353 inside_work_tree = is_inside_dir(get_git_work_tree());
354 return inside_work_tree;
892c41b9
ML
355}
356
f3fa1838
JH
357void setup_work_tree(void)
358{
354e6534
JS
359 const char *work_tree, *git_dir;
360 static int initialized = 0;
361
362 if (initialized)
363 return;
fada7674
JK
364
365 if (work_tree_config_is_bogus)
366 die("unable to set up work tree using invalid config");
367
354e6534
JS
368 work_tree = get_git_work_tree();
369 git_dir = get_git_dir();
59f0f2f3 370 if (!is_absolute_path(git_dir))
e2a57aac 371 git_dir = real_path(get_git_dir());
59f0f2f3
MH
372 if (!work_tree || chdir(work_tree))
373 die("This operation must be run in a work tree");
0ed74813
NTND
374
375 /*
376 * Make sure subsequent git processes find correct worktree
377 * if $GIT_WORK_TREE is set relative
378 */
379 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
380 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
381
41894ae3 382 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 383 initialized = 1;
59f0f2f3
MH
384}
385
2cc7c2c7 386static int check_repo_format(const char *var, const char *value, void *vdata)
31e26ebc 387{
2cc7c2c7 388 struct repository_format *data = vdata;
00a09d57
JK
389 const char *ext;
390
31e26ebc 391 if (strcmp(var, "core.repositoryformatversion") == 0)
2cc7c2c7 392 data->version = git_config_int(var, value);
00a09d57
JK
393 else if (skip_prefix(var, "extensions.", &ext)) {
394 /*
395 * record any known extensions here; otherwise,
396 * we fall through to recording it as unknown, and
397 * check_repository_format will complain
398 */
399 if (!strcmp(ext, "noop"))
400 ;
067fbd41 401 else if (!strcmp(ext, "preciousobjects"))
2cc7c2c7 402 data->precious_objects = git_config_bool(var, value);
00a09d57 403 else
2cc7c2c7 404 string_list_append(&data->unknown_extensions, ext);
652f18ee
JK
405 } else if (strcmp(var, "core.bare") == 0) {
406 data->is_bare = git_config_bool(var, value);
407 } else if (strcmp(var, "core.worktree") == 0) {
408 if (!value)
409 return config_error_nonbool(var);
410 data->work_tree = xstrdup(value);
00a09d57 411 }
31e26ebc
NTND
412 return 0;
413}
414
337e51ce 415static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 416{
7d0fb0da 417 struct strbuf sb = STRBUF_INIT;
2cc7c2c7
JK
418 struct strbuf err = STRBUF_INIT;
419 struct repository_format candidate;
652f18ee 420 int has_common;
00a09d57 421
652f18ee 422 has_common = get_common_dir(&sb, gitdir);
e61a509a 423 strbuf_addstr(&sb, "/config");
652f18ee 424 read_repository_format(&candidate, sb.buf);
2cc7c2c7 425 strbuf_release(&sb);
e61a509a 426
337e51ce 427 /*
2cc7c2c7
JK
428 * For historical use of check_repository_format() in git-init,
429 * we treat a missing config as a silent "ok", even when nongit_ok
430 * is unset.
337e51ce 431 */
2cc7c2c7
JK
432 if (candidate.version < 0)
433 return 0;
434
435 if (verify_repository_format(&candidate, &err) < 0) {
436 if (nongit_ok) {
437 warning("%s", err.buf);
438 strbuf_release(&err);
439 *nongit_ok = -1;
440 return -1;
441 }
442 die("%s", err.buf);
443 }
444
2cc7c2c7
JK
445 repository_format_precious_objects = candidate.precious_objects;
446 string_list_clear(&candidate.unknown_extensions, 0);
652f18ee
JK
447 if (!has_common) {
448 if (candidate.is_bare != -1) {
449 is_bare_repository_cfg = candidate.is_bare;
450 if (is_bare_repository_cfg == 1)
451 inside_work_tree = -1;
452 }
453 if (candidate.work_tree) {
454 free(git_work_tree_cfg);
455 git_work_tree_cfg = candidate.work_tree;
2cc7c2c7 456 inside_work_tree = -1;
652f18ee
JK
457 }
458 } else {
459 free(candidate.work_tree);
2cc7c2c7
JK
460 }
461
462 return 0;
463}
464
652f18ee 465int read_repository_format(struct repository_format *format, const char *path)
2cc7c2c7
JK
466{
467 memset(format, 0, sizeof(*format));
468 format->version = -1;
469 format->is_bare = -1;
470 string_list_init(&format->unknown_extensions, 1);
652f18ee 471 git_config_from_file(check_repo_format, path, format);
2cc7c2c7
JK
472 return format->version;
473}
474
2cc7c2c7
JK
475int verify_repository_format(const struct repository_format *format,
476 struct strbuf *err)
477{
478 if (GIT_REPO_VERSION_READ < format->version) {
274db840 479 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
2cc7c2c7
JK
480 GIT_REPO_VERSION_READ, format->version);
481 return -1;
482 }
483
484 if (format->version >= 1 && format->unknown_extensions.nr) {
00a09d57
JK
485 int i;
486
274db840 487 strbuf_addstr(err, _("unknown repository extensions found:"));
00a09d57 488
2cc7c2c7
JK
489 for (i = 0; i < format->unknown_extensions.nr; i++)
490 strbuf_addf(err, "\n\t%s",
491 format->unknown_extensions.items[i].string);
492 return -1;
00a09d57
JK
493 }
494
2cc7c2c7 495 return 0;
9459aa77
NTND
496}
497
5f29433f
SB
498void read_gitfile_error_die(int error_code, const char *path, const char *dir)
499{
500 switch (error_code) {
501 case READ_GITFILE_ERR_STAT_FAILED:
502 case READ_GITFILE_ERR_NOT_A_FILE:
503 /* non-fatal; follow return path */
504 break;
505 case READ_GITFILE_ERR_OPEN_FAILED:
506 die_errno("Error opening '%s'", path);
507 case READ_GITFILE_ERR_TOO_LARGE:
508 die("Too large to be a .git file: '%s'", path);
509 case READ_GITFILE_ERR_READ_FAILED:
510 die("Error reading %s", path);
511 case READ_GITFILE_ERR_INVALID_FORMAT:
512 die("Invalid gitfile format: %s", path);
513 case READ_GITFILE_ERR_NO_PATH:
514 die("No path in gitfile: %s", path);
515 case READ_GITFILE_ERR_NOT_A_REPO:
516 die("Not a git repository: %s", dir);
517 default:
518 die("BUG: unknown error code");
519 }
520}
521
b44ebb19
LH
522/*
523 * Try to read the location of the git directory from the .git file,
524 * return path to git directory if found.
a93bedad
EE
525 *
526 * On failure, if return_error_code is not NULL, return_error_code
527 * will be set to an error code and NULL will be returned. If
528 * return_error_code is NULL the function will die instead (for most
529 * cases).
b44ebb19 530 */
a93bedad 531const char *read_gitfile_gently(const char *path, int *return_error_code)
b44ebb19 532{
921bdd96 533 const int max_file_size = 1 << 20; /* 1MB */
a93bedad
EE
534 int error_code = 0;
535 char *buf = NULL;
536 char *dir = NULL;
40c813e0 537 const char *slash;
b44ebb19
LH
538 struct stat st;
539 int fd;
b1905aea 540 ssize_t len;
b44ebb19 541
a93bedad 542 if (stat(path, &st)) {
5c4003ca 543 /* NEEDSWORK: discern between ENOENT vs other errors */
a93bedad
EE
544 error_code = READ_GITFILE_ERR_STAT_FAILED;
545 goto cleanup_return;
546 }
547 if (!S_ISREG(st.st_mode)) {
548 error_code = READ_GITFILE_ERR_NOT_A_FILE;
549 goto cleanup_return;
550 }
921bdd96
EE
551 if (st.st_size > max_file_size) {
552 error_code = READ_GITFILE_ERR_TOO_LARGE;
553 goto cleanup_return;
554 }
b44ebb19 555 fd = open(path, O_RDONLY);
a93bedad
EE
556 if (fd < 0) {
557 error_code = READ_GITFILE_ERR_OPEN_FAILED;
558 goto cleanup_return;
559 }
3733e694 560 buf = xmallocz(st.st_size);
b44ebb19
LH
561 len = read_in_full(fd, buf, st.st_size);
562 close(fd);
a93bedad
EE
563 if (len != st.st_size) {
564 error_code = READ_GITFILE_ERR_READ_FAILED;
565 goto cleanup_return;
566 }
a93bedad
EE
567 if (!starts_with(buf, "gitdir: ")) {
568 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
569 goto cleanup_return;
570 }
b44ebb19
LH
571 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
572 len--;
a93bedad
EE
573 if (len < 9) {
574 error_code = READ_GITFILE_ERR_NO_PATH;
575 goto cleanup_return;
576 }
b44ebb19 577 buf[len] = '\0';
40c813e0
BK
578 dir = buf + 8;
579
580 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
581 size_t pathlen = slash+1 - path;
75faa45a
JK
582 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
583 (int)(len - 8), buf + 8);
40c813e0
BK
584 free(buf);
585 buf = dir;
586 }
a93bedad
EE
587 if (!is_git_directory(dir)) {
588 error_code = READ_GITFILE_ERR_NOT_A_REPO;
589 goto cleanup_return;
590 }
e2a57aac 591 path = real_path(dir);
40c813e0 592
a93bedad 593cleanup_return:
a93bedad
EE
594 if (return_error_code)
595 *return_error_code = error_code;
5f29433f
SB
596 else if (error_code)
597 read_gitfile_error_die(error_code, path, dir);
a93bedad 598
b44ebb19 599 free(buf);
38ae8784 600 return error_code ? NULL : path;
b44ebb19
LH
601}
602
e4e30347 603static const char *setup_explicit_git_dir(const char *gitdirenv,
7333ed17 604 struct strbuf *cwd,
b3f66fd3 605 int *nongit_ok)
e4e30347 606{
b3f66fd3
NTND
607 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
608 const char *worktree;
609 char *gitfile;
9b125da4 610 int offset;
e4e30347
JN
611
612 if (PATH_MAX - 40 < strlen(gitdirenv))
613 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 614
13d6ec91 615 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
616 if (gitfile) {
617 gitfile = xstrdup(gitfile);
618 gitdirenv = gitfile;
619 }
620
e4e30347
JN
621 if (!is_git_directory(gitdirenv)) {
622 if (nongit_ok) {
623 *nongit_ok = 1;
b3f66fd3 624 free(gitfile);
e4e30347
JN
625 return NULL;
626 }
627 die("Not a git repository: '%s'", gitdirenv);
628 }
b3f66fd3
NTND
629
630 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
631 free(gitfile);
632 return NULL;
e4e30347 633 }
b3f66fd3
NTND
634
635 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
636 if (work_tree_env)
637 set_git_work_tree(work_tree_env);
638 else if (is_bare_repository_cfg > 0) {
fada7674
JK
639 if (git_work_tree_cfg) {
640 /* #22.2, #30 */
641 warning("core.bare and core.worktree do not make sense");
642 work_tree_config_is_bogus = 1;
643 }
b3f66fd3
NTND
644
645 /* #18, #26 */
646 set_git_dir(gitdirenv);
647 free(gitfile);
e4e30347 648 return NULL;
b3f66fd3
NTND
649 }
650 else if (git_work_tree_cfg) { /* #6, #14 */
651 if (is_absolute_path(git_work_tree_cfg))
652 set_git_work_tree(git_work_tree_cfg);
653 else {
56b9f6e7 654 char *core_worktree;
b3f66fd3
NTND
655 if (chdir(gitdirenv))
656 die_errno("Could not chdir to '%s'", gitdirenv);
657 if (chdir(git_work_tree_cfg))
658 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
56b9f6e7 659 core_worktree = xgetcwd();
7333ed17 660 if (chdir(cwd->buf))
b3f66fd3
NTND
661 die_errno("Could not come back to cwd");
662 set_git_work_tree(core_worktree);
56b9f6e7 663 free(core_worktree);
b3f66fd3
NTND
664 }
665 }
2cd83d10
JK
666 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
667 /* #16d */
668 set_git_dir(gitdirenv);
669 free(gitfile);
670 return NULL;
671 }
b3f66fd3
NTND
672 else /* #2, #10 */
673 set_git_work_tree(".");
674
675 /* set_git_work_tree() must have been called by now */
676 worktree = get_git_work_tree();
677
678 /* both get_git_work_tree() and cwd are already normalized */
7333ed17 679 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
b3f66fd3
NTND
680 set_git_dir(gitdirenv);
681 free(gitfile);
e4e30347 682 return NULL;
b3f66fd3 683 }
e4e30347 684
7333ed17 685 offset = dir_inside_of(cwd->buf, worktree);
9b125da4 686 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 687 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
688 if (chdir(worktree))
689 die_errno("Could not chdir to '%s'", worktree);
7333ed17 690 strbuf_addch(cwd, '/');
b3f66fd3 691 free(gitfile);
7333ed17 692 return cwd->buf + offset;
93a00542 693 }
b3f66fd3
NTND
694
695 /* cwd outside worktree */
696 set_git_dir(gitdirenv);
697 free(gitfile);
698 return NULL;
93a00542
JN
699}
700
9951d3b3 701static const char *setup_discovered_git_dir(const char *gitdir,
7333ed17 702 struct strbuf *cwd, int offset,
9951d3b3 703 int *nongit_ok)
98937bef 704{
9951d3b3
NTND
705 if (check_repository_format_gently(gitdir, nongit_ok))
706 return NULL;
98937bef 707
4868b2ea
JN
708 /* --work-tree is set without --git-dir; use discovered one */
709 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
7333ed17 710 if (offset != cwd->len && !is_absolute_path(gitdir))
ce83eadd 711 gitdir = real_pathdup(gitdir, 1);
7333ed17 712 if (chdir(cwd->buf))
4868b2ea 713 die_errno("Could not come back to cwd");
7333ed17 714 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
715 }
716
9951d3b3
NTND
717 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
718 if (is_bare_repository_cfg > 0) {
7333ed17
RS
719 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
720 if (chdir(cwd->buf))
9951d3b3 721 die_errno("Could not come back to cwd");
98937bef 722 return NULL;
9951d3b3 723 }
98937bef 724
9951d3b3
NTND
725 /* #0, #1, #5, #8, #9, #12, #13 */
726 set_git_work_tree(".");
727 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
728 set_git_dir(gitdir);
98937bef 729 inside_git_dir = 0;
9951d3b3 730 inside_work_tree = 1;
7333ed17 731 if (offset == cwd->len)
98937bef
NTND
732 return NULL;
733
df380d58
JS
734 /* Make "offset" point past the '/' (already the case for root dirs) */
735 if (offset != offset_1st_component(cwd->buf))
736 offset++;
737 /* Add a '/' at the end */
7333ed17
RS
738 strbuf_addch(cwd, '/');
739 return cwd->buf + offset;
98937bef
NTND
740}
741
1cd8031b 742/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
7333ed17
RS
743static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
744 int *nongit_ok)
68698da5
JN
745{
746 int root_len;
747
1cd8031b
NTND
748 if (check_repository_format_gently(".", nongit_ok))
749 return NULL;
750
2cd83d10
JK
751 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
752
4868b2ea
JN
753 /* --work-tree is set without --git-dir; use discovered one */
754 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
755 const char *gitdir;
756
7333ed17
RS
757 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
758 if (chdir(cwd->buf))
4868b2ea 759 die_errno("Could not come back to cwd");
7333ed17 760 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
761 }
762
68698da5 763 inside_git_dir = 1;
1cd8031b 764 inside_work_tree = 0;
7333ed17
RS
765 if (offset != cwd->len) {
766 if (chdir(cwd->buf))
8fc0ae80 767 die_errno("Cannot come back to cwd");
7333ed17
RS
768 root_len = offset_1st_component(cwd->buf);
769 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
770 set_git_dir(cwd->buf);
337e51ce 771 }
1cd8031b 772 else
68698da5 773 set_git_dir(".");
68698da5
JN
774 return NULL;
775}
776
f161edeb
JN
777static const char *setup_nongit(const char *cwd, int *nongit_ok)
778{
779 if (!nongit_ok)
2ff30e67 780 die(_("Not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
f161edeb 781 if (chdir(cwd))
2ff30e67 782 die_errno(_("Cannot come back to cwd"));
f161edeb
JN
783 *nongit_ok = 1;
784 return NULL;
785}
786
2565b43b 787static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
788{
789 struct stat buf;
2565b43b
CB
790 if (stat(path, &buf)) {
791 die_errno("failed to stat '%*s%s%s'",
792 prefix_len,
60c98d1e
JN
793 prefix ? prefix : "",
794 prefix ? "/" : "", path);
2565b43b 795 }
60c98d1e
JN
796 return buf.st_dev;
797}
798
9e2326c7 799/*
1b77d83c
MH
800 * A "string_list_each_func_t" function that canonicalizes an entry
801 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
802 * discards it if unusable. The presence of an empty entry in
803 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
804 * subsequent entries.
9e2326c7 805 */
1b77d83c 806static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 807 void *cb_data)
9e2326c7 808{
7ec30aaa 809 int *empty_entry_found = cb_data;
1b77d83c 810 char *ceil = item->string;
9e2326c7 811
7ec30aaa
MH
812 if (!*ceil) {
813 *empty_entry_found = 1;
9e2326c7 814 return 0;
7ec30aaa 815 } else if (!is_absolute_path(ceil)) {
9e2326c7 816 return 0;
7ec30aaa
MH
817 } else if (*empty_entry_found) {
818 /* Keep entry but do not canonicalize it */
819 return 1;
820 } else {
ce83eadd 821 char *real_path = real_pathdup(ceil, 0);
4ac9006f 822 if (!real_path) {
7ec30aaa 823 return 0;
4ac9006f 824 }
7ec30aaa 825 free(item->string);
4ac9006f 826 item->string = real_path;
7ec30aaa
MH
827 return 1;
828 }
9e2326c7
MH
829}
830
ce9b8aab
JS
831enum discovery_result {
832 GIT_DIR_NONE = 0,
833 GIT_DIR_EXPLICIT,
834 GIT_DIR_DISCOVERED,
835 GIT_DIR_BARE,
836 /* these are errors */
837 GIT_DIR_HIT_CEILING = -1,
01017dce
JS
838 GIT_DIR_HIT_MOUNT_POINT = -2,
839 GIT_DIR_INVALID_GITFILE = -3
ce9b8aab
JS
840};
841
e90fdc39
JS
842/*
843 * We cannot decide in this function whether we are in the work tree or
844 * not, since the config can only be read _after_ this function was called.
ce9b8aab
JS
845 *
846 * Also, we avoid changing any global state (such as the current working
847 * directory) to allow early callers.
848 *
849 * The directory where the search should start needs to be passed in via the
850 * `dir` parameter; upon return, the `dir` buffer will contain the path of
851 * the directory where the search ended, and `gitdir` will contain the path of
852 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it
853 * is relative to `dir` (i.e. *not* necessarily the cwd).
e90fdc39 854 */
ce9b8aab 855static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
01017dce
JS
856 struct strbuf *gitdir,
857 int die_on_error)
d288a700 858{
0454dd93 859 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 860 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
ce9b8aab
JS
861 const char *gitdirenv;
862 int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1;
c7d1d1b1
RH
863 dev_t current_device = 0;
864 int one_filesystem = 1;
d288a700 865
e90fdc39
JS
866 /*
867 * If GIT_DIR is set explicitly, we're not going
868 * to do any discovery, but we still do repository
869 * validation.
870 */
ad1a382f 871 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
ce9b8aab
JS
872 if (gitdirenv) {
873 strbuf_addstr(gitdir, gitdirenv);
874 return GIT_DIR_EXPLICIT;
875 }
d288a700 876
31171d9e 877 if (env_ceiling_dirs) {
7ec30aaa
MH
878 int empty_entry_found = 0;
879
31171d9e 880 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 881 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 882 canonicalize_ceiling_entry, &empty_entry_found);
ce9b8aab 883 ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs);
31171d9e
MH
884 string_list_clear(&ceiling_dirs, 0);
885 }
886
ce9b8aab
JS
887 if (ceil_offset < 0)
888 ceil_offset = min_offset - 2;
d288a700 889
892c41b9 890 /*
ce9b8aab 891 * Test in the following order (relative to the dir):
b44ebb19 892 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
893 * - .git/
894 * - ./ (bare)
b44ebb19 895 * - ../.git
e90fdc39
JS
896 * - ../.git/
897 * - ../ (bare)
898 * - ../../.git/
899 * etc.
892c41b9 900 */
cf87463e 901 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 902 if (one_filesystem)
ce9b8aab 903 current_device = get_device_or_die(dir->buf, NULL, 0);
e90fdc39 904 for (;;) {
01017dce 905 int offset = dir->len, error_code = 0;
ce9b8aab
JS
906
907 if (offset > min_offset)
908 strbuf_addch(dir, '/');
909 strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
01017dce
JS
910 gitdirenv = read_gitfile_gently(dir->buf, die_on_error ?
911 NULL : &error_code);
912 if (!gitdirenv) {
913 if (die_on_error ||
914 error_code == READ_GITFILE_ERR_NOT_A_FILE) {
5c4003ca 915 /* NEEDSWORK: fail if .git is not file nor dir */
01017dce
JS
916 if (is_git_directory(dir->buf))
917 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
918 } else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
919 return GIT_DIR_INVALID_GITFILE;
9951d3b3 920 }
ce9b8aab 921 strbuf_setlen(dir, offset);
9951d3b3 922 if (gitdirenv) {
ce9b8aab
JS
923 strbuf_addstr(gitdir, gitdirenv);
924 return GIT_DIR_DISCOVERED;
9951d3b3 925 }
9951d3b3 926
ce9b8aab
JS
927 if (is_git_directory(dir->buf)) {
928 strbuf_addstr(gitdir, ".");
929 return GIT_DIR_BARE;
502ffe34 930 }
9951d3b3 931
ce9b8aab
JS
932 if (offset <= min_offset)
933 return GIT_DIR_HIT_CEILING;
1cd8031b 934
ce9b8aab 935 while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset]))
6c1e6544 936 ; /* continue */
ce9b8aab
JS
937 if (offset <= ceil_offset)
938 return GIT_DIR_HIT_CEILING;
939
940 strbuf_setlen(dir, offset > min_offset ? offset : min_offset);
941 if (one_filesystem &&
942 current_device != get_device_or_die(dir->buf, NULL, offset))
943 return GIT_DIR_HIT_MOUNT_POINT;
892c41b9 944 }
d288a700 945}
5e7bfe25 946
16ac8b8d
JS
947const char *discover_git_directory(struct strbuf *gitdir)
948{
949 struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
950 size_t gitdir_offset = gitdir->len, cwd_len;
951 struct repository_format candidate;
952
953 if (strbuf_getcwd(&dir))
954 return NULL;
955
956 cwd_len = dir.len;
01017dce 957 if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) {
16ac8b8d
JS
958 strbuf_release(&dir);
959 return NULL;
960 }
961
962 /*
963 * The returned gitdir is relative to dir, and if dir does not reflect
964 * the current working directory, we simply make the gitdir absolute.
965 */
966 if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) {
967 /* Avoid a trailing "/." */
968 if (!strcmp(".", gitdir->buf + gitdir_offset))
969 strbuf_setlen(gitdir, gitdir_offset);
970 else
971 strbuf_addch(&dir, '/');
972 strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
973 }
974
975 strbuf_reset(&dir);
976 strbuf_addf(&dir, "%s/config", gitdir->buf + gitdir_offset);
977 read_repository_format(&candidate, dir.buf);
978 strbuf_release(&dir);
979
980 if (verify_repository_format(&candidate, &err) < 0) {
981 warning("ignoring git dir '%s': %s",
982 gitdir->buf + gitdir_offset, err.buf);
983 strbuf_release(&err);
984 return NULL;
985 }
986
987 return gitdir->buf + gitdir_offset;
988}
989
a60645f9
NTND
990const char *setup_git_directory_gently(int *nongit_ok)
991{
ce9b8aab
JS
992 static struct strbuf cwd = STRBUF_INIT;
993 struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
b58a68c1 994 const char *prefix, *env_prefix;
a60645f9 995
ce9b8aab
JS
996 /*
997 * We may have read an incomplete configuration before
998 * setting-up the git directory. If so, clear the cache so
999 * that the next queries to the configuration reload complete
1000 * configuration (including the per-repo config file that we
1001 * ignored previously).
1002 */
1003 git_config_clear();
1004
1005 /*
1006 * Let's assume that we are in a git repository.
1007 * If it turns out later that we are somewhere else, the value will be
1008 * updated accordingly.
1009 */
1010 if (nongit_ok)
1011 *nongit_ok = 0;
1012
1013 if (strbuf_getcwd(&cwd))
1014 die_errno(_("Unable to read current working directory"));
1015 strbuf_addbuf(&dir, &cwd);
1016
01017dce 1017 switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) {
ce9b8aab
JS
1018 case GIT_DIR_NONE:
1019 prefix = NULL;
1020 break;
1021 case GIT_DIR_EXPLICIT:
1022 prefix = setup_explicit_git_dir(gitdir.buf, &cwd, nongit_ok);
1023 break;
1024 case GIT_DIR_DISCOVERED:
1025 if (dir.len < cwd.len && chdir(dir.buf))
1026 die(_("Cannot change to '%s'"), dir.buf);
1027 prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
1028 nongit_ok);
1029 break;
1030 case GIT_DIR_BARE:
1031 if (dir.len < cwd.len && chdir(dir.buf))
1032 die(_("Cannot change to '%s'"), dir.buf);
1033 prefix = setup_bare_git_dir(&cwd, dir.len, nongit_ok);
1034 break;
1035 case GIT_DIR_HIT_CEILING:
1036 prefix = setup_nongit(cwd.buf, nongit_ok);
1037 break;
1038 case GIT_DIR_HIT_MOUNT_POINT:
1039 if (nongit_ok) {
1040 *nongit_ok = 1;
1041 strbuf_release(&cwd);
1042 strbuf_release(&dir);
1043 return NULL;
1044 }
1045 die(_("Not a git repository (or any parent up to mount point %s)\n"
1046 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
1047 dir.buf);
1048 default:
1049 die("BUG: unhandled setup_git_directory_1() result");
1050 }
1051
3736c925 1052 env_prefix = getenv(GIT_TOPLEVEL_PREFIX_ENVIRONMENT);
b58a68c1
BW
1053 if (env_prefix)
1054 prefix = env_prefix;
1055
1f5d271f 1056 if (prefix)
a6f7f9a3 1057 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 1058 else
a6f7f9a3 1059 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 1060
46c3cd44
JK
1061 startup_info->have_repository = !nongit_ok || !*nongit_ok;
1062 startup_info->prefix = prefix;
1063
ce9b8aab
JS
1064 strbuf_release(&dir);
1065 strbuf_release(&gitdir);
1066
a60645f9
NTND
1067 return prefix;
1068}
1069
94df2506
JH
1070int git_config_perm(const char *var, const char *value)
1071{
06cbe855
HO
1072 int i;
1073 char *endptr;
1074
1075 if (value == NULL)
1076 return PERM_GROUP;
1077
1078 if (!strcmp(value, "umask"))
1079 return PERM_UMASK;
1080 if (!strcmp(value, "group"))
1081 return PERM_GROUP;
1082 if (!strcmp(value, "all") ||
1083 !strcmp(value, "world") ||
1084 !strcmp(value, "everybody"))
1085 return PERM_EVERYBODY;
1086
1087 /* Parse octal numbers */
1088 i = strtol(value, &endptr, 8);
1089
1090 /* If not an octal number, maybe true/false? */
1091 if (*endptr != 0)
1092 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
1093
1094 /*
1095 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 1096 * a chmod value to restrict to.
06cbe855
HO
1097 */
1098 switch (i) {
1099 case PERM_UMASK: /* 0 */
1100 return PERM_UMASK;
1101 case OLD_PERM_GROUP: /* 1 */
1102 return PERM_GROUP;
1103 case OLD_PERM_EVERYBODY: /* 2 */
1104 return PERM_EVERYBODY;
94df2506 1105 }
06cbe855
HO
1106
1107 /* A filemode value was given: 0xxx */
1108
1109 if ((i & 0600) != 0600)
2ff30e67 1110 die(_("Problem with core.sharedRepository filemode value "
06cbe855 1111 "(0%.3o).\nThe owner of files must always have "
2ff30e67 1112 "read and write permissions."), i);
06cbe855
HO
1113
1114 /*
1115 * Mask filemode value. Others can not get write permission.
1116 * x flags for directories are handled separately.
1117 */
5a688fe4 1118 return -(i & 0666);
94df2506
JH
1119}
1120
4b0d1eeb 1121void check_repository_format(void)
ab9cb76f 1122{
f1c126bd
JK
1123 check_repository_format_gently(get_git_dir(), NULL);
1124 startup_info->have_repository = 1;
ab9cb76f
JH
1125}
1126
e1e5ec86
CB
1127/*
1128 * Returns the "prefix", a path to the current working directory
1129 * relative to the work tree root, or NULL, if the current working
1130 * directory is not a strict subdirectory of the work tree root. The
1131 * prefix always ends with a '/' character.
1132 */
5e7bfe25
JH
1133const char *setup_git_directory(void)
1134{
b3f66fd3 1135 return setup_git_directory_gently(NULL);
5e7bfe25 1136}
abc06822 1137
40d96325 1138const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
abc06822
FG
1139{
1140 if (is_git_directory(suspect))
1141 return suspect;
40d96325 1142 return read_gitfile_gently(suspect, return_error_code);
abc06822 1143}
1d999ddd
TR
1144
1145/* if any standard file descriptor is missing open it to /dev/null */
1146void sanitize_stdfds(void)
1147{
1148 int fd = open("/dev/null", O_RDWR, 0);
1149 while (fd != -1 && fd < 2)
1150 fd = dup(fd);
1151 if (fd == -1)
1152 die_errno("open /dev/null or dup failed");
1153 if (fd > 2)
1154 close(fd);
1155}
de0957ce
NTND
1156
1157int daemonize(void)
1158{
1159#ifdef NO_POSIX_GOODIES
1160 errno = ENOSYS;
1161 return -1;
1162#else
1163 switch (fork()) {
1164 case 0:
1165 break;
1166 case -1:
1167 die_errno("fork failed");
1168 default:
1169 exit(0);
1170 }
1171 if (setsid() == -1)
1172 die_errno("setsid failed");
1173 close(0);
1174 close(1);
1175 close(2);
1176 sanitize_stdfds();
1177 return 0;
1178#endif
1179}