add chdir-notify API
[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 121 if (!r)
fc045fe7 122 die(_("'%s' is outside repository"), path);
546e0fd9
JK
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 }
fc045fe7 163 die_errno(_("failed to stat '%s'"), arg);
c6e8c800
JH
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 232 if (*arg == '-')
fc045fe7 233 die(_("option '%s' must come before non-option arguments"), 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 314 /* Check worktree-related signatures */
fa4d8c78
JK
315 strbuf_addstr(&path, suspect);
316 strbuf_complete(&path, '/');
317 strbuf_addstr(&path, "HEAD");
4dc4e145
NTND
318 if (validate_headref(path.buf))
319 goto done;
320
321 strbuf_reset(&path);
322 get_common_dir(&path, suspect);
1d186b6f 323 len = path.len;
4dc4e145
NTND
324
325 /* Check non-worktree-related signatures */
ad1a382f
SP
326 if (getenv(DB_ENVIRONMENT)) {
327 if (access(getenv(DB_ENVIRONMENT), X_OK))
1d186b6f 328 goto done;
ad1a382f
SP
329 }
330 else {
4dc4e145 331 strbuf_setlen(&path, len);
1d186b6f
NTND
332 strbuf_addstr(&path, "/objects");
333 if (access(path.buf, X_OK))
334 goto done;
ad1a382f
SP
335 }
336
1d186b6f
NTND
337 strbuf_setlen(&path, len);
338 strbuf_addstr(&path, "/refs");
339 if (access(path.buf, X_OK))
340 goto done;
ad1a382f 341
1d186b6f
NTND
342 ret = 1;
343done:
344 strbuf_release(&path);
345 return ret;
5f5608bc
LT
346}
347
ffd036b1
JK
348int is_nonbare_repository_dir(struct strbuf *path)
349{
350 int ret = 0;
351 int gitfile_error;
352 size_t orig_path_len = path->len;
353 assert(orig_path_len != 0);
354 strbuf_complete(path, '/');
355 strbuf_addstr(path, ".git");
356 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
357 ret = 1;
358 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
359 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
360 ret = 1;
361 strbuf_setlen(path, orig_path_len);
362 return ret;
363}
364
68025633
JS
365int is_inside_git_dir(void)
366{
e90fdc39
JS
367 if (inside_git_dir < 0)
368 inside_git_dir = is_inside_dir(get_git_dir());
369 return inside_git_dir;
892c41b9
ML
370}
371
892c41b9
ML
372int is_inside_work_tree(void)
373{
e90fdc39
JS
374 if (inside_work_tree < 0)
375 inside_work_tree = is_inside_dir(get_git_work_tree());
376 return inside_work_tree;
892c41b9
ML
377}
378
f3fa1838
JH
379void setup_work_tree(void)
380{
354e6534
JS
381 const char *work_tree, *git_dir;
382 static int initialized = 0;
383
384 if (initialized)
385 return;
fada7674
JK
386
387 if (work_tree_config_is_bogus)
fc045fe7 388 die(_("unable to set up work tree using invalid config"));
fada7674 389
354e6534
JS
390 work_tree = get_git_work_tree();
391 git_dir = get_git_dir();
59f0f2f3 392 if (!is_absolute_path(git_dir))
e2a57aac 393 git_dir = real_path(get_git_dir());
59f0f2f3 394 if (!work_tree || chdir(work_tree))
fc045fe7 395 die(_("this operation must be run in a work tree"));
0ed74813
NTND
396
397 /*
398 * Make sure subsequent git processes find correct worktree
399 * if $GIT_WORK_TREE is set relative
400 */
401 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
402 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
403
41894ae3 404 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 405 initialized = 1;
59f0f2f3
MH
406}
407
2cc7c2c7 408static int check_repo_format(const char *var, const char *value, void *vdata)
31e26ebc 409{
2cc7c2c7 410 struct repository_format *data = vdata;
00a09d57
JK
411 const char *ext;
412
31e26ebc 413 if (strcmp(var, "core.repositoryformatversion") == 0)
2cc7c2c7 414 data->version = git_config_int(var, value);
00a09d57
JK
415 else if (skip_prefix(var, "extensions.", &ext)) {
416 /*
417 * record any known extensions here; otherwise,
418 * we fall through to recording it as unknown, and
419 * check_repository_format will complain
420 */
421 if (!strcmp(ext, "noop"))
422 ;
067fbd41 423 else if (!strcmp(ext, "preciousobjects"))
2cc7c2c7 424 data->precious_objects = git_config_bool(var, value);
75b97fec
JT
425 else if (!strcmp(ext, "partialclone")) {
426 if (!value)
427 return config_error_nonbool(var);
428 data->partial_clone = xstrdup(value);
429 } else
2cc7c2c7 430 string_list_append(&data->unknown_extensions, ext);
652f18ee
JK
431 } else if (strcmp(var, "core.bare") == 0) {
432 data->is_bare = git_config_bool(var, value);
433 } else if (strcmp(var, "core.worktree") == 0) {
434 if (!value)
435 return config_error_nonbool(var);
436 data->work_tree = xstrdup(value);
00a09d57 437 }
31e26ebc
NTND
438 return 0;
439}
440
abade65b 441static int check_repository_format_gently(const char *gitdir, struct repository_format *candidate, int *nongit_ok)
9459aa77 442{
7d0fb0da 443 struct strbuf sb = STRBUF_INIT;
2cc7c2c7 444 struct strbuf err = STRBUF_INIT;
652f18ee 445 int has_common;
00a09d57 446
652f18ee 447 has_common = get_common_dir(&sb, gitdir);
e61a509a 448 strbuf_addstr(&sb, "/config");
abade65b 449 read_repository_format(candidate, sb.buf);
2cc7c2c7 450 strbuf_release(&sb);
e61a509a 451
337e51ce 452 /*
2cc7c2c7
JK
453 * For historical use of check_repository_format() in git-init,
454 * we treat a missing config as a silent "ok", even when nongit_ok
455 * is unset.
337e51ce 456 */
abade65b 457 if (candidate->version < 0)
2cc7c2c7
JK
458 return 0;
459
abade65b 460 if (verify_repository_format(candidate, &err) < 0) {
2cc7c2c7
JK
461 if (nongit_ok) {
462 warning("%s", err.buf);
463 strbuf_release(&err);
464 *nongit_ok = -1;
465 return -1;
466 }
467 die("%s", err.buf);
468 }
469
abade65b 470 repository_format_precious_objects = candidate->precious_objects;
f3d618d2 471 repository_format_partial_clone = candidate->partial_clone;
abade65b 472 string_list_clear(&candidate->unknown_extensions, 0);
652f18ee 473 if (!has_common) {
abade65b 474 if (candidate->is_bare != -1) {
475 is_bare_repository_cfg = candidate->is_bare;
652f18ee
JK
476 if (is_bare_repository_cfg == 1)
477 inside_work_tree = -1;
478 }
abade65b 479 if (candidate->work_tree) {
652f18ee 480 free(git_work_tree_cfg);
abade65b 481 git_work_tree_cfg = candidate->work_tree;
2cc7c2c7 482 inside_work_tree = -1;
652f18ee
JK
483 }
484 } else {
abade65b 485 free(candidate->work_tree);
2cc7c2c7
JK
486 }
487
488 return 0;
489}
490
652f18ee 491int read_repository_format(struct repository_format *format, const char *path)
2cc7c2c7
JK
492{
493 memset(format, 0, sizeof(*format));
494 format->version = -1;
495 format->is_bare = -1;
78a67668 496 format->hash_algo = GIT_HASH_SHA1;
2cc7c2c7 497 string_list_init(&format->unknown_extensions, 1);
652f18ee 498 git_config_from_file(check_repo_format, path, format);
2cc7c2c7
JK
499 return format->version;
500}
501
2cc7c2c7
JK
502int verify_repository_format(const struct repository_format *format,
503 struct strbuf *err)
504{
505 if (GIT_REPO_VERSION_READ < format->version) {
274db840 506 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
2cc7c2c7
JK
507 GIT_REPO_VERSION_READ, format->version);
508 return -1;
509 }
510
511 if (format->version >= 1 && format->unknown_extensions.nr) {
00a09d57
JK
512 int i;
513
274db840 514 strbuf_addstr(err, _("unknown repository extensions found:"));
00a09d57 515
2cc7c2c7
JK
516 for (i = 0; i < format->unknown_extensions.nr; i++)
517 strbuf_addf(err, "\n\t%s",
518 format->unknown_extensions.items[i].string);
519 return -1;
00a09d57
JK
520 }
521
2cc7c2c7 522 return 0;
9459aa77
NTND
523}
524
5f29433f
SB
525void read_gitfile_error_die(int error_code, const char *path, const char *dir)
526{
527 switch (error_code) {
528 case READ_GITFILE_ERR_STAT_FAILED:
529 case READ_GITFILE_ERR_NOT_A_FILE:
530 /* non-fatal; follow return path */
531 break;
532 case READ_GITFILE_ERR_OPEN_FAILED:
fc045fe7 533 die_errno(_("error opening '%s'"), path);
5f29433f 534 case READ_GITFILE_ERR_TOO_LARGE:
fc045fe7 535 die(_("too large to be a .git file: '%s'"), path);
5f29433f 536 case READ_GITFILE_ERR_READ_FAILED:
fc045fe7 537 die(_("error reading %s"), path);
5f29433f 538 case READ_GITFILE_ERR_INVALID_FORMAT:
fc045fe7 539 die(_("invalid gitfile format: %s"), path);
5f29433f 540 case READ_GITFILE_ERR_NO_PATH:
fc045fe7 541 die(_("no path in gitfile: %s"), path);
5f29433f 542 case READ_GITFILE_ERR_NOT_A_REPO:
fc045fe7 543 die(_("not a git repository: %s"), dir);
5f29433f
SB
544 default:
545 die("BUG: unknown error code");
546 }
547}
548
b44ebb19
LH
549/*
550 * Try to read the location of the git directory from the .git file,
ea1d8756
HWN
551 * return path to git directory if found. The return value comes from
552 * a shared buffer.
a93bedad
EE
553 *
554 * On failure, if return_error_code is not NULL, return_error_code
555 * will be set to an error code and NULL will be returned. If
556 * return_error_code is NULL the function will die instead (for most
557 * cases).
b44ebb19 558 */
a93bedad 559const char *read_gitfile_gently(const char *path, int *return_error_code)
b44ebb19 560{
921bdd96 561 const int max_file_size = 1 << 20; /* 1MB */
a93bedad
EE
562 int error_code = 0;
563 char *buf = NULL;
564 char *dir = NULL;
40c813e0 565 const char *slash;
b44ebb19
LH
566 struct stat st;
567 int fd;
b1905aea 568 ssize_t len;
b44ebb19 569
a93bedad 570 if (stat(path, &st)) {
5c4003ca 571 /* NEEDSWORK: discern between ENOENT vs other errors */
a93bedad
EE
572 error_code = READ_GITFILE_ERR_STAT_FAILED;
573 goto cleanup_return;
574 }
575 if (!S_ISREG(st.st_mode)) {
576 error_code = READ_GITFILE_ERR_NOT_A_FILE;
577 goto cleanup_return;
578 }
921bdd96
EE
579 if (st.st_size > max_file_size) {
580 error_code = READ_GITFILE_ERR_TOO_LARGE;
581 goto cleanup_return;
582 }
b44ebb19 583 fd = open(path, O_RDONLY);
a93bedad
EE
584 if (fd < 0) {
585 error_code = READ_GITFILE_ERR_OPEN_FAILED;
586 goto cleanup_return;
587 }
3733e694 588 buf = xmallocz(st.st_size);
b44ebb19
LH
589 len = read_in_full(fd, buf, st.st_size);
590 close(fd);
a93bedad
EE
591 if (len != st.st_size) {
592 error_code = READ_GITFILE_ERR_READ_FAILED;
593 goto cleanup_return;
594 }
a93bedad
EE
595 if (!starts_with(buf, "gitdir: ")) {
596 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
597 goto cleanup_return;
598 }
b44ebb19
LH
599 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
600 len--;
a93bedad
EE
601 if (len < 9) {
602 error_code = READ_GITFILE_ERR_NO_PATH;
603 goto cleanup_return;
604 }
b44ebb19 605 buf[len] = '\0';
40c813e0
BK
606 dir = buf + 8;
607
608 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
609 size_t pathlen = slash+1 - path;
75faa45a
JK
610 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
611 (int)(len - 8), buf + 8);
40c813e0
BK
612 free(buf);
613 buf = dir;
614 }
a93bedad
EE
615 if (!is_git_directory(dir)) {
616 error_code = READ_GITFILE_ERR_NOT_A_REPO;
617 goto cleanup_return;
618 }
e2a57aac 619 path = real_path(dir);
40c813e0 620
a93bedad 621cleanup_return:
a93bedad
EE
622 if (return_error_code)
623 *return_error_code = error_code;
5f29433f
SB
624 else if (error_code)
625 read_gitfile_error_die(error_code, path, dir);
a93bedad 626
b44ebb19 627 free(buf);
38ae8784 628 return error_code ? NULL : path;
b44ebb19
LH
629}
630
e4e30347 631static const char *setup_explicit_git_dir(const char *gitdirenv,
7333ed17 632 struct strbuf *cwd,
abade65b 633 struct repository_format *repo_fmt,
b3f66fd3 634 int *nongit_ok)
e4e30347 635{
b3f66fd3
NTND
636 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
637 const char *worktree;
638 char *gitfile;
9b125da4 639 int offset;
e4e30347
JN
640
641 if (PATH_MAX - 40 < strlen(gitdirenv))
fc045fe7 642 die(_("'$%s' too big"), GIT_DIR_ENVIRONMENT);
b3f66fd3 643
13d6ec91 644 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
645 if (gitfile) {
646 gitfile = xstrdup(gitfile);
647 gitdirenv = gitfile;
648 }
649
e4e30347
JN
650 if (!is_git_directory(gitdirenv)) {
651 if (nongit_ok) {
652 *nongit_ok = 1;
b3f66fd3 653 free(gitfile);
e4e30347
JN
654 return NULL;
655 }
fc045fe7 656 die(_("not a git repository: '%s'"), gitdirenv);
e4e30347 657 }
b3f66fd3 658
abade65b 659 if (check_repository_format_gently(gitdirenv, repo_fmt, nongit_ok)) {
b3f66fd3
NTND
660 free(gitfile);
661 return NULL;
e4e30347 662 }
b3f66fd3
NTND
663
664 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
665 if (work_tree_env)
666 set_git_work_tree(work_tree_env);
667 else if (is_bare_repository_cfg > 0) {
fada7674
JK
668 if (git_work_tree_cfg) {
669 /* #22.2, #30 */
670 warning("core.bare and core.worktree do not make sense");
671 work_tree_config_is_bogus = 1;
672 }
b3f66fd3
NTND
673
674 /* #18, #26 */
675 set_git_dir(gitdirenv);
676 free(gitfile);
e4e30347 677 return NULL;
b3f66fd3
NTND
678 }
679 else if (git_work_tree_cfg) { /* #6, #14 */
680 if (is_absolute_path(git_work_tree_cfg))
681 set_git_work_tree(git_work_tree_cfg);
682 else {
56b9f6e7 683 char *core_worktree;
b3f66fd3 684 if (chdir(gitdirenv))
fc045fe7 685 die_errno(_("cannot chdir to '%s'"), gitdirenv);
b3f66fd3 686 if (chdir(git_work_tree_cfg))
fc045fe7 687 die_errno(_("cannot chdir to '%s'"), git_work_tree_cfg);
56b9f6e7 688 core_worktree = xgetcwd();
7333ed17 689 if (chdir(cwd->buf))
fc045fe7 690 die_errno(_("cannot come back to cwd"));
b3f66fd3 691 set_git_work_tree(core_worktree);
56b9f6e7 692 free(core_worktree);
b3f66fd3
NTND
693 }
694 }
2cd83d10
JK
695 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
696 /* #16d */
697 set_git_dir(gitdirenv);
698 free(gitfile);
699 return NULL;
700 }
b3f66fd3
NTND
701 else /* #2, #10 */
702 set_git_work_tree(".");
703
704 /* set_git_work_tree() must have been called by now */
705 worktree = get_git_work_tree();
706
707 /* both get_git_work_tree() and cwd are already normalized */
7333ed17 708 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
b3f66fd3
NTND
709 set_git_dir(gitdirenv);
710 free(gitfile);
e4e30347 711 return NULL;
b3f66fd3 712 }
e4e30347 713
7333ed17 714 offset = dir_inside_of(cwd->buf, worktree);
9b125da4 715 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 716 set_git_dir(real_path(gitdirenv));
b3f66fd3 717 if (chdir(worktree))
fc045fe7 718 die_errno(_("cannot chdir to '%s'"), worktree);
7333ed17 719 strbuf_addch(cwd, '/');
b3f66fd3 720 free(gitfile);
7333ed17 721 return cwd->buf + offset;
93a00542 722 }
b3f66fd3
NTND
723
724 /* cwd outside worktree */
725 set_git_dir(gitdirenv);
726 free(gitfile);
727 return NULL;
93a00542
JN
728}
729
9951d3b3 730static const char *setup_discovered_git_dir(const char *gitdir,
7333ed17 731 struct strbuf *cwd, int offset,
abade65b 732 struct repository_format *repo_fmt,
9951d3b3 733 int *nongit_ok)
98937bef 734{
abade65b 735 if (check_repository_format_gently(gitdir, repo_fmt, nongit_ok))
9951d3b3 736 return NULL;
98937bef 737
4868b2ea
JN
738 /* --work-tree is set without --git-dir; use discovered one */
739 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
2d4dcf21
JS
740 char *to_free = NULL;
741 const char *ret;
742
7333ed17 743 if (offset != cwd->len && !is_absolute_path(gitdir))
2d4dcf21 744 gitdir = to_free = real_pathdup(gitdir, 1);
7333ed17 745 if (chdir(cwd->buf))
fc045fe7 746 die_errno(_("cannot come back to cwd"));
abade65b 747 ret = setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok);
2d4dcf21
JS
748 free(to_free);
749 return ret;
4868b2ea
JN
750 }
751
9951d3b3
NTND
752 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
753 if (is_bare_repository_cfg > 0) {
7333ed17
RS
754 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
755 if (chdir(cwd->buf))
fc045fe7 756 die_errno(_("cannot come back to cwd"));
98937bef 757 return NULL;
9951d3b3 758 }
98937bef 759
9951d3b3
NTND
760 /* #0, #1, #5, #8, #9, #12, #13 */
761 set_git_work_tree(".");
762 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
763 set_git_dir(gitdir);
98937bef 764 inside_git_dir = 0;
9951d3b3 765 inside_work_tree = 1;
7333ed17 766 if (offset == cwd->len)
98937bef
NTND
767 return NULL;
768
df380d58
JS
769 /* Make "offset" point past the '/' (already the case for root dirs) */
770 if (offset != offset_1st_component(cwd->buf))
771 offset++;
772 /* Add a '/' at the end */
7333ed17
RS
773 strbuf_addch(cwd, '/');
774 return cwd->buf + offset;
98937bef
NTND
775}
776
1cd8031b 777/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
7333ed17 778static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
abade65b 779 struct repository_format *repo_fmt,
7333ed17 780 int *nongit_ok)
68698da5
JN
781{
782 int root_len;
783
abade65b 784 if (check_repository_format_gently(".", repo_fmt, nongit_ok))
1cd8031b
NTND
785 return NULL;
786
2cd83d10
JK
787 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
788
4868b2ea
JN
789 /* --work-tree is set without --git-dir; use discovered one */
790 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
da6f8475 791 static const char *gitdir;
4868b2ea 792
7333ed17
RS
793 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
794 if (chdir(cwd->buf))
fc045fe7 795 die_errno(_("cannot come back to cwd"));
abade65b 796 return setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok);
4868b2ea
JN
797 }
798
68698da5 799 inside_git_dir = 1;
1cd8031b 800 inside_work_tree = 0;
7333ed17
RS
801 if (offset != cwd->len) {
802 if (chdir(cwd->buf))
fc045fe7 803 die_errno(_("cannot come back to cwd"));
7333ed17
RS
804 root_len = offset_1st_component(cwd->buf);
805 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
806 set_git_dir(cwd->buf);
337e51ce 807 }
1cd8031b 808 else
68698da5 809 set_git_dir(".");
68698da5
JN
810 return NULL;
811}
812
f161edeb
JN
813static const char *setup_nongit(const char *cwd, int *nongit_ok)
814{
815 if (!nongit_ok)
fc045fe7 816 die(_("not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
f161edeb 817 if (chdir(cwd))
fc045fe7 818 die_errno(_("cannot come back to cwd"));
f161edeb
JN
819 *nongit_ok = 1;
820 return NULL;
821}
822
2565b43b 823static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
824{
825 struct stat buf;
2565b43b 826 if (stat(path, &buf)) {
fc045fe7 827 die_errno(_("failed to stat '%*s%s%s'"),
2565b43b 828 prefix_len,
60c98d1e
JN
829 prefix ? prefix : "",
830 prefix ? "/" : "", path);
2565b43b 831 }
60c98d1e
JN
832 return buf.st_dev;
833}
834
9e2326c7 835/*
1b77d83c
MH
836 * A "string_list_each_func_t" function that canonicalizes an entry
837 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
838 * discards it if unusable. The presence of an empty entry in
839 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
840 * subsequent entries.
9e2326c7 841 */
1b77d83c 842static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 843 void *cb_data)
9e2326c7 844{
7ec30aaa 845 int *empty_entry_found = cb_data;
1b77d83c 846 char *ceil = item->string;
9e2326c7 847
7ec30aaa
MH
848 if (!*ceil) {
849 *empty_entry_found = 1;
9e2326c7 850 return 0;
7ec30aaa 851 } else if (!is_absolute_path(ceil)) {
9e2326c7 852 return 0;
7ec30aaa
MH
853 } else if (*empty_entry_found) {
854 /* Keep entry but do not canonicalize it */
855 return 1;
856 } else {
ce83eadd 857 char *real_path = real_pathdup(ceil, 0);
4ac9006f 858 if (!real_path) {
7ec30aaa 859 return 0;
4ac9006f 860 }
7ec30aaa 861 free(item->string);
4ac9006f 862 item->string = real_path;
7ec30aaa
MH
863 return 1;
864 }
9e2326c7
MH
865}
866
ce9b8aab
JS
867enum discovery_result {
868 GIT_DIR_NONE = 0,
869 GIT_DIR_EXPLICIT,
870 GIT_DIR_DISCOVERED,
871 GIT_DIR_BARE,
872 /* these are errors */
873 GIT_DIR_HIT_CEILING = -1,
01017dce
JS
874 GIT_DIR_HIT_MOUNT_POINT = -2,
875 GIT_DIR_INVALID_GITFILE = -3
ce9b8aab
JS
876};
877
e90fdc39
JS
878/*
879 * We cannot decide in this function whether we are in the work tree or
880 * not, since the config can only be read _after_ this function was called.
ce9b8aab
JS
881 *
882 * Also, we avoid changing any global state (such as the current working
883 * directory) to allow early callers.
884 *
885 * The directory where the search should start needs to be passed in via the
886 * `dir` parameter; upon return, the `dir` buffer will contain the path of
887 * the directory where the search ended, and `gitdir` will contain the path of
888 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it
889 * is relative to `dir` (i.e. *not* necessarily the cwd).
e90fdc39 890 */
ce9b8aab 891static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
01017dce
JS
892 struct strbuf *gitdir,
893 int die_on_error)
d288a700 894{
0454dd93 895 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 896 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
ce9b8aab
JS
897 const char *gitdirenv;
898 int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1;
c7d1d1b1
RH
899 dev_t current_device = 0;
900 int one_filesystem = 1;
d288a700 901
e90fdc39
JS
902 /*
903 * If GIT_DIR is set explicitly, we're not going
904 * to do any discovery, but we still do repository
905 * validation.
906 */
ad1a382f 907 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
ce9b8aab
JS
908 if (gitdirenv) {
909 strbuf_addstr(gitdir, gitdirenv);
910 return GIT_DIR_EXPLICIT;
911 }
d288a700 912
31171d9e 913 if (env_ceiling_dirs) {
7ec30aaa
MH
914 int empty_entry_found = 0;
915
31171d9e 916 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 917 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 918 canonicalize_ceiling_entry, &empty_entry_found);
ce9b8aab 919 ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs);
31171d9e
MH
920 string_list_clear(&ceiling_dirs, 0);
921 }
922
ce9b8aab
JS
923 if (ceil_offset < 0)
924 ceil_offset = min_offset - 2;
d288a700 925
892c41b9 926 /*
ce9b8aab 927 * Test in the following order (relative to the dir):
b44ebb19 928 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
929 * - .git/
930 * - ./ (bare)
b44ebb19 931 * - ../.git
e90fdc39
JS
932 * - ../.git/
933 * - ../ (bare)
176b2d32 934 * - ../../.git
e90fdc39 935 * etc.
892c41b9 936 */
cf87463e 937 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 938 if (one_filesystem)
ce9b8aab 939 current_device = get_device_or_die(dir->buf, NULL, 0);
e90fdc39 940 for (;;) {
01017dce 941 int offset = dir->len, error_code = 0;
ce9b8aab
JS
942
943 if (offset > min_offset)
944 strbuf_addch(dir, '/');
945 strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
01017dce
JS
946 gitdirenv = read_gitfile_gently(dir->buf, die_on_error ?
947 NULL : &error_code);
948 if (!gitdirenv) {
949 if (die_on_error ||
950 error_code == READ_GITFILE_ERR_NOT_A_FILE) {
5c4003ca 951 /* NEEDSWORK: fail if .git is not file nor dir */
01017dce
JS
952 if (is_git_directory(dir->buf))
953 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
954 } else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
955 return GIT_DIR_INVALID_GITFILE;
9951d3b3 956 }
ce9b8aab 957 strbuf_setlen(dir, offset);
9951d3b3 958 if (gitdirenv) {
ce9b8aab
JS
959 strbuf_addstr(gitdir, gitdirenv);
960 return GIT_DIR_DISCOVERED;
9951d3b3 961 }
9951d3b3 962
ce9b8aab
JS
963 if (is_git_directory(dir->buf)) {
964 strbuf_addstr(gitdir, ".");
965 return GIT_DIR_BARE;
502ffe34 966 }
9951d3b3 967
ce9b8aab
JS
968 if (offset <= min_offset)
969 return GIT_DIR_HIT_CEILING;
1cd8031b 970
ce9b8aab 971 while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset]))
6c1e6544 972 ; /* continue */
ce9b8aab
JS
973 if (offset <= ceil_offset)
974 return GIT_DIR_HIT_CEILING;
975
976 strbuf_setlen(dir, offset > min_offset ? offset : min_offset);
977 if (one_filesystem &&
978 current_device != get_device_or_die(dir->buf, NULL, offset))
979 return GIT_DIR_HIT_MOUNT_POINT;
892c41b9 980 }
d288a700 981}
5e7bfe25 982
d3fb71b3
BW
983int discover_git_directory(struct strbuf *commondir,
984 struct strbuf *gitdir)
16ac8b8d
JS
985{
986 struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
987 size_t gitdir_offset = gitdir->len, cwd_len;
d3fb71b3 988 size_t commondir_offset = commondir->len;
16ac8b8d
JS
989 struct repository_format candidate;
990
991 if (strbuf_getcwd(&dir))
d3fb71b3 992 return -1;
16ac8b8d
JS
993
994 cwd_len = dir.len;
01017dce 995 if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) {
16ac8b8d 996 strbuf_release(&dir);
d3fb71b3 997 return -1;
16ac8b8d
JS
998 }
999
1000 /*
1001 * The returned gitdir is relative to dir, and if dir does not reflect
1002 * the current working directory, we simply make the gitdir absolute.
1003 */
1004 if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) {
1005 /* Avoid a trailing "/." */
1006 if (!strcmp(".", gitdir->buf + gitdir_offset))
1007 strbuf_setlen(gitdir, gitdir_offset);
1008 else
1009 strbuf_addch(&dir, '/');
1010 strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
1011 }
1012
d3fb71b3
BW
1013 get_common_dir(commondir, gitdir->buf + gitdir_offset);
1014
16ac8b8d 1015 strbuf_reset(&dir);
d3fb71b3 1016 strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset);
16ac8b8d
JS
1017 read_repository_format(&candidate, dir.buf);
1018 strbuf_release(&dir);
1019
1020 if (verify_repository_format(&candidate, &err) < 0) {
1021 warning("ignoring git dir '%s': %s",
1022 gitdir->buf + gitdir_offset, err.buf);
1023 strbuf_release(&err);
d3fb71b3 1024 strbuf_setlen(commondir, commondir_offset);
69743f9b 1025 strbuf_setlen(gitdir, gitdir_offset);
d3fb71b3 1026 return -1;
16ac8b8d
JS
1027 }
1028
d3fb71b3 1029 return 0;
16ac8b8d
JS
1030}
1031
a60645f9
NTND
1032const char *setup_git_directory_gently(int *nongit_ok)
1033{
ce9b8aab
JS
1034 static struct strbuf cwd = STRBUF_INIT;
1035 struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
f9ee2fcd 1036 const char *prefix;
abade65b 1037 struct repository_format repo_fmt;
a60645f9 1038
ce9b8aab
JS
1039 /*
1040 * We may have read an incomplete configuration before
1041 * setting-up the git directory. If so, clear the cache so
1042 * that the next queries to the configuration reload complete
1043 * configuration (including the per-repo config file that we
1044 * ignored previously).
1045 */
1046 git_config_clear();
1047
1048 /*
1049 * Let's assume that we are in a git repository.
1050 * If it turns out later that we are somewhere else, the value will be
1051 * updated accordingly.
1052 */
1053 if (nongit_ok)
1054 *nongit_ok = 0;
1055
1056 if (strbuf_getcwd(&cwd))
1057 die_errno(_("Unable to read current working directory"));
1058 strbuf_addbuf(&dir, &cwd);
1059
01017dce 1060 switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) {
ce9b8aab
JS
1061 case GIT_DIR_NONE:
1062 prefix = NULL;
1063 break;
1064 case GIT_DIR_EXPLICIT:
abade65b 1065 prefix = setup_explicit_git_dir(gitdir.buf, &cwd, &repo_fmt, nongit_ok);
ce9b8aab
JS
1066 break;
1067 case GIT_DIR_DISCOVERED:
1068 if (dir.len < cwd.len && chdir(dir.buf))
fc045fe7 1069 die(_("cannot change to '%s'"), dir.buf);
ce9b8aab 1070 prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
abade65b 1071 &repo_fmt, nongit_ok);
ce9b8aab
JS
1072 break;
1073 case GIT_DIR_BARE:
1074 if (dir.len < cwd.len && chdir(dir.buf))
fc045fe7 1075 die(_("cannot change to '%s'"), dir.buf);
abade65b 1076 prefix = setup_bare_git_dir(&cwd, dir.len, &repo_fmt, nongit_ok);
ce9b8aab
JS
1077 break;
1078 case GIT_DIR_HIT_CEILING:
1079 prefix = setup_nongit(cwd.buf, nongit_ok);
1080 break;
1081 case GIT_DIR_HIT_MOUNT_POINT:
1082 if (nongit_ok) {
1083 *nongit_ok = 1;
1084 strbuf_release(&cwd);
1085 strbuf_release(&dir);
1086 return NULL;
1087 }
fc045fe7 1088 die(_("not a git repository (or any parent up to mount point %s)\n"
ce9b8aab
JS
1089 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
1090 dir.buf);
1091 default:
1092 die("BUG: unhandled setup_git_directory_1() result");
1093 }
1094
1f5d271f 1095 if (prefix)
a6f7f9a3 1096 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 1097 else
a6f7f9a3 1098 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 1099
46c3cd44
JK
1100 startup_info->have_repository = !nongit_ok || !*nongit_ok;
1101 startup_info->prefix = prefix;
1102
73f192c9
BW
1103 /*
1104 * Not all paths through the setup code will call 'set_git_dir()' (which
1105 * directly sets up the environment) so in order to guarantee that the
1106 * environment is in a consistent state after setup, explicitly setup
1107 * the environment if we have a repository.
1108 *
1109 * NEEDSWORK: currently we allow bogus GIT_DIR values to be set in some
1110 * code paths so we also need to explicitly setup the environment if
1111 * the user has set GIT_DIR. It may be beneficial to disallow bogus
1112 * GIT_DIR values at some point in the future.
1113 */
c14c234f
BW
1114 if (startup_info->have_repository || getenv(GIT_DIR_ENVIRONMENT)) {
1115 if (!the_repository->gitdir) {
1116 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
1117 if (!gitdir)
1118 gitdir = DEFAULT_GIT_DIR_ENVIRONMENT;
1119 repo_set_gitdir(the_repository, gitdir);
1120 setup_git_env();
1121 }
78a67668 1122 if (startup_info->have_repository)
1123 repo_set_hash_algo(the_repository, repo_fmt.hash_algo);
c14c234f 1124 }
73f192c9 1125
ce9b8aab
JS
1126 strbuf_release(&dir);
1127 strbuf_release(&gitdir);
1128
a60645f9
NTND
1129 return prefix;
1130}
1131
94df2506
JH
1132int git_config_perm(const char *var, const char *value)
1133{
06cbe855
HO
1134 int i;
1135 char *endptr;
1136
1137 if (value == NULL)
1138 return PERM_GROUP;
1139
1140 if (!strcmp(value, "umask"))
1141 return PERM_UMASK;
1142 if (!strcmp(value, "group"))
1143 return PERM_GROUP;
1144 if (!strcmp(value, "all") ||
1145 !strcmp(value, "world") ||
1146 !strcmp(value, "everybody"))
1147 return PERM_EVERYBODY;
1148
1149 /* Parse octal numbers */
1150 i = strtol(value, &endptr, 8);
1151
1152 /* If not an octal number, maybe true/false? */
1153 if (*endptr != 0)
1154 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
1155
1156 /*
1157 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 1158 * a chmod value to restrict to.
06cbe855
HO
1159 */
1160 switch (i) {
1161 case PERM_UMASK: /* 0 */
1162 return PERM_UMASK;
1163 case OLD_PERM_GROUP: /* 1 */
1164 return PERM_GROUP;
1165 case OLD_PERM_EVERYBODY: /* 2 */
1166 return PERM_EVERYBODY;
94df2506 1167 }
06cbe855
HO
1168
1169 /* A filemode value was given: 0xxx */
1170
1171 if ((i & 0600) != 0600)
fc045fe7 1172 die(_("problem with core.sharedRepository filemode value "
06cbe855 1173 "(0%.3o).\nThe owner of files must always have "
2ff30e67 1174 "read and write permissions."), i);
06cbe855
HO
1175
1176 /*
1177 * Mask filemode value. Others can not get write permission.
1178 * x flags for directories are handled separately.
1179 */
5a688fe4 1180 return -(i & 0666);
94df2506
JH
1181}
1182
4b0d1eeb 1183void check_repository_format(void)
ab9cb76f 1184{
abade65b 1185 struct repository_format repo_fmt;
1186 check_repository_format_gently(get_git_dir(), &repo_fmt, NULL);
f1c126bd 1187 startup_info->have_repository = 1;
ab9cb76f
JH
1188}
1189
e1e5ec86
CB
1190/*
1191 * Returns the "prefix", a path to the current working directory
1192 * relative to the work tree root, or NULL, if the current working
1193 * directory is not a strict subdirectory of the work tree root. The
1194 * prefix always ends with a '/' character.
1195 */
5e7bfe25
JH
1196const char *setup_git_directory(void)
1197{
b3f66fd3 1198 return setup_git_directory_gently(NULL);
5e7bfe25 1199}
abc06822 1200
40d96325 1201const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
abc06822
FG
1202{
1203 if (is_git_directory(suspect))
1204 return suspect;
40d96325 1205 return read_gitfile_gently(suspect, return_error_code);
abc06822 1206}
1d999ddd
TR
1207
1208/* if any standard file descriptor is missing open it to /dev/null */
1209void sanitize_stdfds(void)
1210{
1211 int fd = open("/dev/null", O_RDWR, 0);
1212 while (fd != -1 && fd < 2)
1213 fd = dup(fd);
1214 if (fd == -1)
fc045fe7 1215 die_errno(_("open /dev/null or dup failed"));
1d999ddd
TR
1216 if (fd > 2)
1217 close(fd);
1218}
de0957ce
NTND
1219
1220int daemonize(void)
1221{
1222#ifdef NO_POSIX_GOODIES
1223 errno = ENOSYS;
1224 return -1;
1225#else
1226 switch (fork()) {
1227 case 0:
1228 break;
1229 case -1:
fc045fe7 1230 die_errno(_("fork failed"));
de0957ce
NTND
1231 default:
1232 exit(0);
1233 }
1234 if (setsid() == -1)
fc045fe7 1235 die_errno(_("setsid failed"));
de0957ce
NTND
1236 close(0);
1237 close(1);
1238 close(2);
1239 sanitize_stdfds();
1240 return 0;
1241#endif
1242}