t1300: extract and use test_cmp_config()
[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"
8500e0de 6#include "chdir-notify.h"
e90fdc39
JS
7
8static int inside_git_dir = -1;
9static int inside_work_tree = -1;
fada7674 10static int work_tree_config_is_bogus;
d288a700 11
46c3cd44
JK
12static struct startup_info the_startup_info;
13struct startup_info *startup_info = &the_startup_info;
14
ddc2a628
MEW
15/*
16 * The input parameter must contain an absolute path, and it must already be
17 * normalized.
18 *
19 * Find the part of an absolute path that lies inside the work tree by
20 * dereferencing symlinks outside the work tree, for example:
21 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
22 * /dir/file (work tree is /) -> dir/file
23 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
24 * /dir/repolink/file (repolink points to /dir/repo) -> file
25 * /dir/repo (exactly equal to work tree) -> (empty string)
26 */
27static int abspath_part_inside_repo(char *path)
28{
29 size_t len;
30 size_t wtlen;
31 char *path0;
32 int off;
33 const char *work_tree = get_git_work_tree();
34
35 if (!work_tree)
36 return -1;
37 wtlen = strlen(work_tree);
38 len = strlen(path);
6127ff63 39 off = offset_1st_component(path);
ddc2a628
MEW
40
41 /* check if work tree is already the prefix */
42 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
43 if (path[wtlen] == '/') {
44 memmove(path, path + wtlen + 1, len - wtlen);
45 return 0;
46 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
47 /* work tree is the root, or the whole path */
48 memmove(path, path + wtlen, len - wtlen + 1);
49 return 0;
50 }
51 /* work tree might match beginning of a symlink to work tree */
52 off = wtlen;
53 }
54 path0 = path;
6127ff63 55 path += off;
ddc2a628
MEW
56
57 /* check each '/'-terminated level */
58 while (*path) {
59 path++;
60 if (*path == '/') {
61 *path = '\0';
62 if (strcmp(real_path(path0), work_tree) == 0) {
63 memmove(path0, path + 1, len - (path - path0));
64 return 0;
65 }
66 *path = '/';
67 }
68 }
69
70 /* check whole path */
71 if (strcmp(real_path(path0), work_tree) == 0) {
72 *path0 = '\0';
73 return 0;
74 }
75
76 return -1;
77}
78
645a29c4
NTND
79/*
80 * Normalize "path", prepending the "prefix" for relative paths. If
81 * remaining_prefix is not NULL, return the actual prefix still
82 * remains in the path. For example, prefix = sub1/sub2/ and path is
83 *
84 * foo -> sub1/sub2/foo (full prefix)
85 * ../foo -> sub1/foo (remaining prefix is sub1/)
86 * ../../bar -> bar (no remaining prefix)
87 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
88 * `pwd`/../bar -> sub1/bar (no remaining prefix)
89 */
90char *prefix_path_gently(const char *prefix, int len,
91 int *remaining_prefix, const char *path)
d089ebaa
JH
92{
93 const char *orig = path;
18e051a3
CMAB
94 char *sanitized;
95 if (is_absolute_path(orig)) {
3733e694 96 sanitized = xmallocz(strlen(path));
645a29c4
NTND
97 if (remaining_prefix)
98 *remaining_prefix = 0;
655ee9ea
MEW
99 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
100 free(sanitized);
101 return NULL;
102 }
103 if (abspath_part_inside_repo(sanitized)) {
104 free(sanitized);
105 return NULL;
106 }
18e051a3 107 } else {
24041d6b 108 sanitized = xstrfmt("%.*s%s", len, len ? prefix : "", path);
645a29c4
NTND
109 if (remaining_prefix)
110 *remaining_prefix = len;
655ee9ea 111 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
546e0fd9
JK
112 free(sanitized);
113 return NULL;
d089ebaa 114 }
d089ebaa
JH
115 }
116 return sanitized;
f332726e
LT
117}
118
546e0fd9
JK
119char *prefix_path(const char *prefix, int len, const char *path)
120{
645a29c4 121 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9 122 if (!r)
fc045fe7 123 die(_("'%s' is outside repository"), path);
546e0fd9
JK
124 return r;
125}
126
127int path_inside_repo(const char *prefix, const char *path)
128{
129 int len = prefix ? strlen(prefix) : 0;
645a29c4 130 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
131 if (r) {
132 free(r);
133 return 1;
134 }
135 return 0;
136}
137
c6e8c800
JH
138int check_filename(const char *prefix, const char *arg)
139{
e4da43b1 140 char *to_free = NULL;
c6e8c800
JH
141 struct stat st;
142
d51c6ee0
JK
143 if (skip_prefix(arg, ":/", &arg)) {
144 if (!*arg) /* ":/" is root dir, always exists */
4db86e8b 145 return 1;
a08cbcda 146 prefix = NULL;
42471bce
JK
147 } else if (skip_prefix(arg, ":!", &arg) ||
148 skip_prefix(arg, ":^", &arg)) {
149 if (!*arg) /* excluding everything is silly, but allowed */
150 return 1;
a08cbcda
JK
151 }
152
153 if (prefix)
154 arg = to_free = prefix_filename(prefix, arg);
155
156 if (!lstat(arg, &st)) {
e4da43b1 157 free(to_free);
c6e8c800 158 return 1; /* file exists */
e4da43b1 159 }
93dd544f 160 if (is_missing_file_error(errno)) {
e4da43b1 161 free(to_free);
c6e8c800 162 return 0; /* file does not exist */
e4da43b1 163 }
fc045fe7 164 die_errno(_("failed to stat '%s'"), arg);
c6e8c800
JH
165}
166
023e37c3
MM
167static void NORETURN die_verify_filename(const char *prefix,
168 const char *arg,
169 int diagnose_misspelt_rev)
009fee47 170{
023e37c3 171 if (!diagnose_misspelt_rev)
ab33a76e
VA
172 die(_("%s: no such path in the working tree.\n"
173 "Use 'git <command> -- <path>...' to specify paths that do not exist locally."),
023e37c3 174 arg);
0e539dca
JH
175 /*
176 * Saying "'(icase)foo' does not exist in the index" when the
177 * user gave us ":(icase)foo" is just stupid. A magic pathspec
178 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 179 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
180 */
181 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 182 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 183
009fee47 184 /* ... or fall back the most general message. */
ab33a76e
VA
185 die(_("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
186 "Use '--' to separate paths from revisions, like this:\n"
187 "'git <command> [<revision>...] -- [<file>...]'"), arg);
009fee47
MM
188
189}
190
c99eddd8
JK
191/*
192 * Check for arguments that don't resolve as actual files,
193 * but which look sufficiently like pathspecs that we'll consider
194 * them such for the purposes of rev/pathspec DWIM parsing.
195 */
196static int looks_like_pathspec(const char *arg)
197{
198 /* anything with a wildcard character */
199 if (!no_wildcard(arg))
200 return 1;
201
202 /* long-form pathspec magic */
203 if (starts_with(arg, ":("))
204 return 1;
205
206 return 0;
207}
208
e23d0b4a
LT
209/*
210 * Verify a filename that we got as an argument for a pathspec
211 * entry. Note that a filename that begins with "-" never verifies
212 * as true, because even if such a filename were to exist, we want
213 * it to be preceded by the "--" marker (or we want the user to
214 * use a format like "./-filename")
023e37c3
MM
215 *
216 * The "diagnose_misspelt_rev" is used to provide a user-friendly
217 * diagnosis when dying upon finding that "name" is not a pathname.
218 * If set to 1, the diagnosis will try to diagnose "name" as an
219 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
220 * will only complain about an inexisting file.
221 *
222 * This function is typically called to check that a "file or rev"
223 * argument is unambiguous. In this case, the caller will want
224 * diagnose_misspelt_rev == 1 when verifying the first non-rev
225 * argument (which could have been a revision), and
226 * diagnose_misspelt_rev == 0 for the next ones (because we already
227 * saw a filename, there's not ambiguity anymore).
e23d0b4a 228 */
023e37c3
MM
229void verify_filename(const char *prefix,
230 const char *arg,
231 int diagnose_misspelt_rev)
e23d0b4a 232{
e23d0b4a 233 if (*arg == '-')
fc045fe7 234 die(_("option '%s' must come before non-option arguments"), arg);
2cb47ab6 235 if (looks_like_pathspec(arg) || check_filename(prefix, arg))
e23d0b4a 236 return;
023e37c3 237 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
238}
239
ea92f41f
JH
240/*
241 * Opposite of the above: the command line did not have -- marker
242 * and we parsed the arg as a refname. It should not be interpretable
243 * as a filename.
244 */
245void verify_non_filename(const char *prefix, const char *arg)
246{
7ae3df8c 247 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 248 return;
ea92f41f
JH
249 if (*arg == '-')
250 return; /* flag */
c6e8c800
JH
251 if (!check_filename(prefix, arg))
252 return;
ab33a76e
VA
253 die(_("ambiguous argument '%s': both revision and filename\n"
254 "Use '--' to separate paths from revisions, like this:\n"
255 "'git <command> [<revision>...] -- [<file>...]'"), arg);
ea92f41f
JH
256}
257
31e26ebc 258int get_common_dir(struct strbuf *sb, const char *gitdir)
11f9dd71
MK
259{
260 const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
261 if (git_env_common_dir) {
262 strbuf_addstr(sb, git_env_common_dir);
263 return 1;
264 } else {
265 return get_common_dir_noenv(sb, gitdir);
266 }
267}
268
269int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)
4dc4e145
NTND
270{
271 struct strbuf data = STRBUF_INIT;
272 struct strbuf path = STRBUF_INIT;
31e26ebc 273 int ret = 0;
11f9dd71 274
4dc4e145
NTND
275 strbuf_addf(&path, "%s/commondir", gitdir);
276 if (file_exists(path.buf)) {
277 if (strbuf_read_file(&data, path.buf, 0) <= 0)
278 die_errno(_("failed to read %s"), path.buf);
279 while (data.len && (data.buf[data.len - 1] == '\n' ||
280 data.buf[data.len - 1] == '\r'))
281 data.len--;
282 data.buf[data.len] = '\0';
283 strbuf_reset(&path);
284 if (!is_absolute_path(data.buf))
285 strbuf_addf(&path, "%s/", gitdir);
286 strbuf_addbuf(&path, &data);
33ad9ddd 287 strbuf_add_real_path(sb, path.buf);
31e26ebc 288 ret = 1;
4ac9006f 289 } else {
4dc4e145 290 strbuf_addstr(sb, gitdir);
4ac9006f
BW
291 }
292
4dc4e145
NTND
293 strbuf_release(&data);
294 strbuf_release(&path);
31e26ebc 295 return ret;
4dc4e145 296}
d288a700 297
5f5608bc 298/*
ad1a382f 299 * Test if it looks like we're at a git directory.
5e7bfe25 300 * We want to see:
5f5608bc 301 *
790296fd 302 * - either an objects/ directory _or_ the proper
5f5608bc 303 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 304 * - a refs/ directory
8098a178 305 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
306 * a proper "ref:", or a regular file HEAD that has a properly
307 * formatted sha1 object name.
5f5608bc 308 */
b3256eb8 309int is_git_directory(const char *suspect)
5f5608bc 310{
1d186b6f
NTND
311 struct strbuf path = STRBUF_INIT;
312 int ret = 0;
313 size_t len;
ad1a382f 314
4dc4e145 315 /* Check worktree-related signatures */
fa4d8c78
JK
316 strbuf_addstr(&path, suspect);
317 strbuf_complete(&path, '/');
318 strbuf_addstr(&path, "HEAD");
4dc4e145
NTND
319 if (validate_headref(path.buf))
320 goto done;
321
322 strbuf_reset(&path);
323 get_common_dir(&path, suspect);
1d186b6f 324 len = path.len;
4dc4e145
NTND
325
326 /* Check non-worktree-related signatures */
ad1a382f
SP
327 if (getenv(DB_ENVIRONMENT)) {
328 if (access(getenv(DB_ENVIRONMENT), X_OK))
1d186b6f 329 goto done;
ad1a382f
SP
330 }
331 else {
4dc4e145 332 strbuf_setlen(&path, len);
1d186b6f
NTND
333 strbuf_addstr(&path, "/objects");
334 if (access(path.buf, X_OK))
335 goto done;
ad1a382f
SP
336 }
337
1d186b6f
NTND
338 strbuf_setlen(&path, len);
339 strbuf_addstr(&path, "/refs");
340 if (access(path.buf, X_OK))
341 goto done;
ad1a382f 342
1d186b6f
NTND
343 ret = 1;
344done:
345 strbuf_release(&path);
346 return ret;
5f5608bc
LT
347}
348
ffd036b1
JK
349int is_nonbare_repository_dir(struct strbuf *path)
350{
351 int ret = 0;
352 int gitfile_error;
353 size_t orig_path_len = path->len;
354 assert(orig_path_len != 0);
355 strbuf_complete(path, '/');
356 strbuf_addstr(path, ".git");
357 if (read_gitfile_gently(path->buf, &gitfile_error) || is_git_directory(path->buf))
358 ret = 1;
359 if (gitfile_error == READ_GITFILE_ERR_OPEN_FAILED ||
360 gitfile_error == READ_GITFILE_ERR_READ_FAILED)
361 ret = 1;
362 strbuf_setlen(path, orig_path_len);
363 return ret;
364}
365
68025633
JS
366int is_inside_git_dir(void)
367{
e90fdc39
JS
368 if (inside_git_dir < 0)
369 inside_git_dir = is_inside_dir(get_git_dir());
370 return inside_git_dir;
892c41b9
ML
371}
372
892c41b9
ML
373int is_inside_work_tree(void)
374{
e90fdc39
JS
375 if (inside_work_tree < 0)
376 inside_work_tree = is_inside_dir(get_git_work_tree());
377 return inside_work_tree;
892c41b9
ML
378}
379
f3fa1838
JH
380void setup_work_tree(void)
381{
8500e0de 382 const char *work_tree;
354e6534
JS
383 static int initialized = 0;
384
385 if (initialized)
386 return;
fada7674
JK
387
388 if (work_tree_config_is_bogus)
fc045fe7 389 die(_("unable to set up work tree using invalid config"));
fada7674 390
354e6534 391 work_tree = get_git_work_tree();
8500e0de 392 if (!work_tree || chdir_notify(work_tree))
fc045fe7 393 die(_("this operation must be run in a work tree"));
0ed74813
NTND
394
395 /*
396 * Make sure subsequent git processes find correct worktree
397 * if $GIT_WORK_TREE is set relative
398 */
399 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
400 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
401
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);
75b97fec
JT
422 else if (!strcmp(ext, "partialclone")) {
423 if (!value)
424 return config_error_nonbool(var);
425 data->partial_clone = xstrdup(value);
426 } else
2cc7c2c7 427 string_list_append(&data->unknown_extensions, ext);
652f18ee
JK
428 } else if (strcmp(var, "core.bare") == 0) {
429 data->is_bare = git_config_bool(var, value);
430 } else if (strcmp(var, "core.worktree") == 0) {
431 if (!value)
432 return config_error_nonbool(var);
433 data->work_tree = xstrdup(value);
00a09d57 434 }
31e26ebc
NTND
435 return 0;
436}
437
abade65b 438static int check_repository_format_gently(const char *gitdir, struct repository_format *candidate, int *nongit_ok)
9459aa77 439{
7d0fb0da 440 struct strbuf sb = STRBUF_INIT;
2cc7c2c7 441 struct strbuf err = STRBUF_INIT;
652f18ee 442 int has_common;
00a09d57 443
652f18ee 444 has_common = get_common_dir(&sb, gitdir);
e61a509a 445 strbuf_addstr(&sb, "/config");
abade65b 446 read_repository_format(candidate, sb.buf);
2cc7c2c7 447 strbuf_release(&sb);
e61a509a 448
337e51ce 449 /*
2cc7c2c7
JK
450 * For historical use of check_repository_format() in git-init,
451 * we treat a missing config as a silent "ok", even when nongit_ok
452 * is unset.
337e51ce 453 */
abade65b 454 if (candidate->version < 0)
2cc7c2c7
JK
455 return 0;
456
abade65b 457 if (verify_repository_format(candidate, &err) < 0) {
2cc7c2c7
JK
458 if (nongit_ok) {
459 warning("%s", err.buf);
460 strbuf_release(&err);
461 *nongit_ok = -1;
462 return -1;
463 }
464 die("%s", err.buf);
465 }
466
abade65b 467 repository_format_precious_objects = candidate->precious_objects;
f3d618d2 468 repository_format_partial_clone = candidate->partial_clone;
abade65b 469 string_list_clear(&candidate->unknown_extensions, 0);
652f18ee 470 if (!has_common) {
abade65b 471 if (candidate->is_bare != -1) {
472 is_bare_repository_cfg = candidate->is_bare;
652f18ee
JK
473 if (is_bare_repository_cfg == 1)
474 inside_work_tree = -1;
475 }
abade65b 476 if (candidate->work_tree) {
652f18ee 477 free(git_work_tree_cfg);
abade65b 478 git_work_tree_cfg = candidate->work_tree;
2cc7c2c7 479 inside_work_tree = -1;
652f18ee
JK
480 }
481 } else {
abade65b 482 free(candidate->work_tree);
2cc7c2c7
JK
483 }
484
485 return 0;
486}
487
652f18ee 488int read_repository_format(struct repository_format *format, const char *path)
2cc7c2c7
JK
489{
490 memset(format, 0, sizeof(*format));
491 format->version = -1;
492 format->is_bare = -1;
78a67668 493 format->hash_algo = GIT_HASH_SHA1;
2cc7c2c7 494 string_list_init(&format->unknown_extensions, 1);
652f18ee 495 git_config_from_file(check_repo_format, path, format);
2cc7c2c7
JK
496 return format->version;
497}
498
2cc7c2c7
JK
499int verify_repository_format(const struct repository_format *format,
500 struct strbuf *err)
501{
502 if (GIT_REPO_VERSION_READ < format->version) {
274db840 503 strbuf_addf(err, _("Expected git repo version <= %d, found %d"),
2cc7c2c7
JK
504 GIT_REPO_VERSION_READ, format->version);
505 return -1;
506 }
507
508 if (format->version >= 1 && format->unknown_extensions.nr) {
00a09d57
JK
509 int i;
510
274db840 511 strbuf_addstr(err, _("unknown repository extensions found:"));
00a09d57 512
2cc7c2c7
JK
513 for (i = 0; i < format->unknown_extensions.nr; i++)
514 strbuf_addf(err, "\n\t%s",
515 format->unknown_extensions.items[i].string);
516 return -1;
00a09d57
JK
517 }
518
2cc7c2c7 519 return 0;
9459aa77
NTND
520}
521
5f29433f
SB
522void read_gitfile_error_die(int error_code, const char *path, const char *dir)
523{
524 switch (error_code) {
525 case READ_GITFILE_ERR_STAT_FAILED:
526 case READ_GITFILE_ERR_NOT_A_FILE:
527 /* non-fatal; follow return path */
528 break;
529 case READ_GITFILE_ERR_OPEN_FAILED:
fc045fe7 530 die_errno(_("error opening '%s'"), path);
5f29433f 531 case READ_GITFILE_ERR_TOO_LARGE:
fc045fe7 532 die(_("too large to be a .git file: '%s'"), path);
5f29433f 533 case READ_GITFILE_ERR_READ_FAILED:
fc045fe7 534 die(_("error reading %s"), path);
5f29433f 535 case READ_GITFILE_ERR_INVALID_FORMAT:
fc045fe7 536 die(_("invalid gitfile format: %s"), path);
5f29433f 537 case READ_GITFILE_ERR_NO_PATH:
fc045fe7 538 die(_("no path in gitfile: %s"), path);
5f29433f 539 case READ_GITFILE_ERR_NOT_A_REPO:
fc045fe7 540 die(_("not a git repository: %s"), dir);
5f29433f 541 default:
033abf97 542 BUG("unknown error code");
5f29433f
SB
543 }
544}
545
b44ebb19
LH
546/*
547 * Try to read the location of the git directory from the .git file,
ea1d8756
HWN
548 * return path to git directory if found. The return value comes from
549 * a shared buffer.
a93bedad
EE
550 *
551 * On failure, if return_error_code is not NULL, return_error_code
552 * will be set to an error code and NULL will be returned. If
553 * return_error_code is NULL the function will die instead (for most
554 * cases).
b44ebb19 555 */
a93bedad 556const char *read_gitfile_gently(const char *path, int *return_error_code)
b44ebb19 557{
921bdd96 558 const int max_file_size = 1 << 20; /* 1MB */
a93bedad
EE
559 int error_code = 0;
560 char *buf = NULL;
561 char *dir = NULL;
40c813e0 562 const char *slash;
b44ebb19
LH
563 struct stat st;
564 int fd;
b1905aea 565 ssize_t len;
b44ebb19 566
a93bedad 567 if (stat(path, &st)) {
5c4003ca 568 /* NEEDSWORK: discern between ENOENT vs other errors */
a93bedad
EE
569 error_code = READ_GITFILE_ERR_STAT_FAILED;
570 goto cleanup_return;
571 }
572 if (!S_ISREG(st.st_mode)) {
573 error_code = READ_GITFILE_ERR_NOT_A_FILE;
574 goto cleanup_return;
575 }
921bdd96
EE
576 if (st.st_size > max_file_size) {
577 error_code = READ_GITFILE_ERR_TOO_LARGE;
578 goto cleanup_return;
579 }
b44ebb19 580 fd = open(path, O_RDONLY);
a93bedad
EE
581 if (fd < 0) {
582 error_code = READ_GITFILE_ERR_OPEN_FAILED;
583 goto cleanup_return;
584 }
3733e694 585 buf = xmallocz(st.st_size);
b44ebb19
LH
586 len = read_in_full(fd, buf, st.st_size);
587 close(fd);
a93bedad
EE
588 if (len != st.st_size) {
589 error_code = READ_GITFILE_ERR_READ_FAILED;
590 goto cleanup_return;
591 }
a93bedad
EE
592 if (!starts_with(buf, "gitdir: ")) {
593 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
594 goto cleanup_return;
595 }
b44ebb19
LH
596 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
597 len--;
a93bedad
EE
598 if (len < 9) {
599 error_code = READ_GITFILE_ERR_NO_PATH;
600 goto cleanup_return;
601 }
b44ebb19 602 buf[len] = '\0';
40c813e0
BK
603 dir = buf + 8;
604
605 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
606 size_t pathlen = slash+1 - path;
75faa45a
JK
607 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
608 (int)(len - 8), buf + 8);
40c813e0
BK
609 free(buf);
610 buf = dir;
611 }
a93bedad
EE
612 if (!is_git_directory(dir)) {
613 error_code = READ_GITFILE_ERR_NOT_A_REPO;
614 goto cleanup_return;
615 }
e2a57aac 616 path = real_path(dir);
40c813e0 617
a93bedad 618cleanup_return:
a93bedad
EE
619 if (return_error_code)
620 *return_error_code = error_code;
5f29433f
SB
621 else if (error_code)
622 read_gitfile_error_die(error_code, path, dir);
a93bedad 623
b44ebb19 624 free(buf);
38ae8784 625 return error_code ? NULL : path;
b44ebb19
LH
626}
627
e4e30347 628static const char *setup_explicit_git_dir(const char *gitdirenv,
7333ed17 629 struct strbuf *cwd,
abade65b 630 struct repository_format *repo_fmt,
b3f66fd3 631 int *nongit_ok)
e4e30347 632{
b3f66fd3
NTND
633 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
634 const char *worktree;
635 char *gitfile;
9b125da4 636 int offset;
e4e30347
JN
637
638 if (PATH_MAX - 40 < strlen(gitdirenv))
fc045fe7 639 die(_("'$%s' too big"), GIT_DIR_ENVIRONMENT);
b3f66fd3 640
13d6ec91 641 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
642 if (gitfile) {
643 gitfile = xstrdup(gitfile);
644 gitdirenv = gitfile;
645 }
646
e4e30347
JN
647 if (!is_git_directory(gitdirenv)) {
648 if (nongit_ok) {
649 *nongit_ok = 1;
b3f66fd3 650 free(gitfile);
e4e30347
JN
651 return NULL;
652 }
fc045fe7 653 die(_("not a git repository: '%s'"), gitdirenv);
e4e30347 654 }
b3f66fd3 655
abade65b 656 if (check_repository_format_gently(gitdirenv, repo_fmt, nongit_ok)) {
b3f66fd3
NTND
657 free(gitfile);
658 return NULL;
e4e30347 659 }
b3f66fd3
NTND
660
661 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
662 if (work_tree_env)
663 set_git_work_tree(work_tree_env);
664 else if (is_bare_repository_cfg > 0) {
fada7674
JK
665 if (git_work_tree_cfg) {
666 /* #22.2, #30 */
667 warning("core.bare and core.worktree do not make sense");
668 work_tree_config_is_bogus = 1;
669 }
b3f66fd3
NTND
670
671 /* #18, #26 */
672 set_git_dir(gitdirenv);
673 free(gitfile);
e4e30347 674 return NULL;
b3f66fd3
NTND
675 }
676 else if (git_work_tree_cfg) { /* #6, #14 */
677 if (is_absolute_path(git_work_tree_cfg))
678 set_git_work_tree(git_work_tree_cfg);
679 else {
56b9f6e7 680 char *core_worktree;
b3f66fd3 681 if (chdir(gitdirenv))
fc045fe7 682 die_errno(_("cannot chdir to '%s'"), gitdirenv);
b3f66fd3 683 if (chdir(git_work_tree_cfg))
fc045fe7 684 die_errno(_("cannot chdir to '%s'"), git_work_tree_cfg);
56b9f6e7 685 core_worktree = xgetcwd();
7333ed17 686 if (chdir(cwd->buf))
fc045fe7 687 die_errno(_("cannot come back to cwd"));
b3f66fd3 688 set_git_work_tree(core_worktree);
56b9f6e7 689 free(core_worktree);
b3f66fd3
NTND
690 }
691 }
2cd83d10
JK
692 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
693 /* #16d */
694 set_git_dir(gitdirenv);
695 free(gitfile);
696 return NULL;
697 }
b3f66fd3
NTND
698 else /* #2, #10 */
699 set_git_work_tree(".");
700
701 /* set_git_work_tree() must have been called by now */
702 worktree = get_git_work_tree();
703
704 /* both get_git_work_tree() and cwd are already normalized */
7333ed17 705 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
b3f66fd3
NTND
706 set_git_dir(gitdirenv);
707 free(gitfile);
e4e30347 708 return NULL;
b3f66fd3 709 }
e4e30347 710
7333ed17 711 offset = dir_inside_of(cwd->buf, worktree);
9b125da4 712 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 713 set_git_dir(real_path(gitdirenv));
b3f66fd3 714 if (chdir(worktree))
fc045fe7 715 die_errno(_("cannot chdir to '%s'"), worktree);
7333ed17 716 strbuf_addch(cwd, '/');
b3f66fd3 717 free(gitfile);
7333ed17 718 return cwd->buf + offset;
93a00542 719 }
b3f66fd3
NTND
720
721 /* cwd outside worktree */
722 set_git_dir(gitdirenv);
723 free(gitfile);
724 return NULL;
93a00542
JN
725}
726
9951d3b3 727static const char *setup_discovered_git_dir(const char *gitdir,
7333ed17 728 struct strbuf *cwd, int offset,
abade65b 729 struct repository_format *repo_fmt,
9951d3b3 730 int *nongit_ok)
98937bef 731{
abade65b 732 if (check_repository_format_gently(gitdir, repo_fmt, nongit_ok))
9951d3b3 733 return NULL;
98937bef 734
4868b2ea
JN
735 /* --work-tree is set without --git-dir; use discovered one */
736 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
2d4dcf21
JS
737 char *to_free = NULL;
738 const char *ret;
739
7333ed17 740 if (offset != cwd->len && !is_absolute_path(gitdir))
2d4dcf21 741 gitdir = to_free = real_pathdup(gitdir, 1);
7333ed17 742 if (chdir(cwd->buf))
fc045fe7 743 die_errno(_("cannot come back to cwd"));
abade65b 744 ret = setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok);
2d4dcf21
JS
745 free(to_free);
746 return ret;
4868b2ea
JN
747 }
748
9951d3b3
NTND
749 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
750 if (is_bare_repository_cfg > 0) {
7333ed17
RS
751 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
752 if (chdir(cwd->buf))
fc045fe7 753 die_errno(_("cannot come back to cwd"));
98937bef 754 return NULL;
9951d3b3 755 }
98937bef 756
9951d3b3
NTND
757 /* #0, #1, #5, #8, #9, #12, #13 */
758 set_git_work_tree(".");
759 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
760 set_git_dir(gitdir);
98937bef 761 inside_git_dir = 0;
9951d3b3 762 inside_work_tree = 1;
7333ed17 763 if (offset == cwd->len)
98937bef
NTND
764 return NULL;
765
df380d58
JS
766 /* Make "offset" point past the '/' (already the case for root dirs) */
767 if (offset != offset_1st_component(cwd->buf))
768 offset++;
769 /* Add a '/' at the end */
7333ed17
RS
770 strbuf_addch(cwd, '/');
771 return cwd->buf + offset;
98937bef
NTND
772}
773
1cd8031b 774/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
7333ed17 775static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
abade65b 776 struct repository_format *repo_fmt,
7333ed17 777 int *nongit_ok)
68698da5
JN
778{
779 int root_len;
780
abade65b 781 if (check_repository_format_gently(".", repo_fmt, nongit_ok))
1cd8031b
NTND
782 return NULL;
783
2cd83d10
JK
784 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
785
4868b2ea
JN
786 /* --work-tree is set without --git-dir; use discovered one */
787 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
da6f8475 788 static const char *gitdir;
4868b2ea 789
7333ed17
RS
790 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
791 if (chdir(cwd->buf))
fc045fe7 792 die_errno(_("cannot come back to cwd"));
abade65b 793 return setup_explicit_git_dir(gitdir, cwd, repo_fmt, nongit_ok);
4868b2ea
JN
794 }
795
68698da5 796 inside_git_dir = 1;
1cd8031b 797 inside_work_tree = 0;
7333ed17
RS
798 if (offset != cwd->len) {
799 if (chdir(cwd->buf))
fc045fe7 800 die_errno(_("cannot come back to cwd"));
7333ed17
RS
801 root_len = offset_1st_component(cwd->buf);
802 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
803 set_git_dir(cwd->buf);
337e51ce 804 }
1cd8031b 805 else
68698da5 806 set_git_dir(".");
68698da5
JN
807 return NULL;
808}
809
f161edeb
JN
810static const char *setup_nongit(const char *cwd, int *nongit_ok)
811{
812 if (!nongit_ok)
fc045fe7 813 die(_("not a git repository (or any of the parent directories): %s"), DEFAULT_GIT_DIR_ENVIRONMENT);
f161edeb 814 if (chdir(cwd))
fc045fe7 815 die_errno(_("cannot come back to cwd"));
f161edeb
JN
816 *nongit_ok = 1;
817 return NULL;
818}
819
2565b43b 820static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
821{
822 struct stat buf;
2565b43b 823 if (stat(path, &buf)) {
fc045fe7 824 die_errno(_("failed to stat '%*s%s%s'"),
2565b43b 825 prefix_len,
60c98d1e
JN
826 prefix ? prefix : "",
827 prefix ? "/" : "", path);
2565b43b 828 }
60c98d1e
JN
829 return buf.st_dev;
830}
831
9e2326c7 832/*
1b77d83c
MH
833 * A "string_list_each_func_t" function that canonicalizes an entry
834 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
835 * discards it if unusable. The presence of an empty entry in
836 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
837 * subsequent entries.
9e2326c7 838 */
1b77d83c 839static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 840 void *cb_data)
9e2326c7 841{
7ec30aaa 842 int *empty_entry_found = cb_data;
1b77d83c 843 char *ceil = item->string;
9e2326c7 844
7ec30aaa
MH
845 if (!*ceil) {
846 *empty_entry_found = 1;
9e2326c7 847 return 0;
7ec30aaa 848 } else if (!is_absolute_path(ceil)) {
9e2326c7 849 return 0;
7ec30aaa
MH
850 } else if (*empty_entry_found) {
851 /* Keep entry but do not canonicalize it */
852 return 1;
853 } else {
ce83eadd 854 char *real_path = real_pathdup(ceil, 0);
4ac9006f 855 if (!real_path) {
7ec30aaa 856 return 0;
4ac9006f 857 }
7ec30aaa 858 free(item->string);
4ac9006f 859 item->string = real_path;
7ec30aaa
MH
860 return 1;
861 }
9e2326c7
MH
862}
863
ce9b8aab
JS
864enum discovery_result {
865 GIT_DIR_NONE = 0,
866 GIT_DIR_EXPLICIT,
867 GIT_DIR_DISCOVERED,
868 GIT_DIR_BARE,
869 /* these are errors */
870 GIT_DIR_HIT_CEILING = -1,
01017dce
JS
871 GIT_DIR_HIT_MOUNT_POINT = -2,
872 GIT_DIR_INVALID_GITFILE = -3
ce9b8aab
JS
873};
874
e90fdc39
JS
875/*
876 * We cannot decide in this function whether we are in the work tree or
877 * not, since the config can only be read _after_ this function was called.
ce9b8aab
JS
878 *
879 * Also, we avoid changing any global state (such as the current working
880 * directory) to allow early callers.
881 *
882 * The directory where the search should start needs to be passed in via the
883 * `dir` parameter; upon return, the `dir` buffer will contain the path of
884 * the directory where the search ended, and `gitdir` will contain the path of
885 * the discovered .git/ directory, if any. If `gitdir` is not absolute, it
886 * is relative to `dir` (i.e. *not* necessarily the cwd).
e90fdc39 887 */
ce9b8aab 888static enum discovery_result setup_git_directory_gently_1(struct strbuf *dir,
01017dce
JS
889 struct strbuf *gitdir,
890 int die_on_error)
d288a700 891{
0454dd93 892 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 893 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
ce9b8aab
JS
894 const char *gitdirenv;
895 int ceil_offset = -1, min_offset = has_dos_drive_prefix(dir->buf) ? 3 : 1;
c7d1d1b1
RH
896 dev_t current_device = 0;
897 int one_filesystem = 1;
d288a700 898
e90fdc39
JS
899 /*
900 * If GIT_DIR is set explicitly, we're not going
901 * to do any discovery, but we still do repository
902 * validation.
903 */
ad1a382f 904 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
ce9b8aab
JS
905 if (gitdirenv) {
906 strbuf_addstr(gitdir, gitdirenv);
907 return GIT_DIR_EXPLICIT;
908 }
d288a700 909
31171d9e 910 if (env_ceiling_dirs) {
7ec30aaa
MH
911 int empty_entry_found = 0;
912
31171d9e 913 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 914 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 915 canonicalize_ceiling_entry, &empty_entry_found);
ce9b8aab 916 ceil_offset = longest_ancestor_length(dir->buf, &ceiling_dirs);
31171d9e
MH
917 string_list_clear(&ceiling_dirs, 0);
918 }
919
ce9b8aab
JS
920 if (ceil_offset < 0)
921 ceil_offset = min_offset - 2;
d288a700 922
892c41b9 923 /*
ce9b8aab 924 * Test in the following order (relative to the dir):
b44ebb19 925 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
926 * - .git/
927 * - ./ (bare)
b44ebb19 928 * - ../.git
e90fdc39
JS
929 * - ../.git/
930 * - ../ (bare)
176b2d32 931 * - ../../.git
e90fdc39 932 * etc.
892c41b9 933 */
cf87463e 934 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 935 if (one_filesystem)
ce9b8aab 936 current_device = get_device_or_die(dir->buf, NULL, 0);
e90fdc39 937 for (;;) {
01017dce 938 int offset = dir->len, error_code = 0;
ce9b8aab
JS
939
940 if (offset > min_offset)
941 strbuf_addch(dir, '/');
942 strbuf_addstr(dir, DEFAULT_GIT_DIR_ENVIRONMENT);
01017dce
JS
943 gitdirenv = read_gitfile_gently(dir->buf, die_on_error ?
944 NULL : &error_code);
945 if (!gitdirenv) {
946 if (die_on_error ||
947 error_code == READ_GITFILE_ERR_NOT_A_FILE) {
5c4003ca 948 /* NEEDSWORK: fail if .git is not file nor dir */
01017dce
JS
949 if (is_git_directory(dir->buf))
950 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
951 } else if (error_code != READ_GITFILE_ERR_STAT_FAILED)
952 return GIT_DIR_INVALID_GITFILE;
9951d3b3 953 }
ce9b8aab 954 strbuf_setlen(dir, offset);
9951d3b3 955 if (gitdirenv) {
ce9b8aab
JS
956 strbuf_addstr(gitdir, gitdirenv);
957 return GIT_DIR_DISCOVERED;
9951d3b3 958 }
9951d3b3 959
ce9b8aab
JS
960 if (is_git_directory(dir->buf)) {
961 strbuf_addstr(gitdir, ".");
962 return GIT_DIR_BARE;
502ffe34 963 }
9951d3b3 964
ce9b8aab
JS
965 if (offset <= min_offset)
966 return GIT_DIR_HIT_CEILING;
1cd8031b 967
ce9b8aab 968 while (--offset > ceil_offset && !is_dir_sep(dir->buf[offset]))
6c1e6544 969 ; /* continue */
ce9b8aab
JS
970 if (offset <= ceil_offset)
971 return GIT_DIR_HIT_CEILING;
972
973 strbuf_setlen(dir, offset > min_offset ? offset : min_offset);
974 if (one_filesystem &&
975 current_device != get_device_or_die(dir->buf, NULL, offset))
976 return GIT_DIR_HIT_MOUNT_POINT;
892c41b9 977 }
d288a700 978}
5e7bfe25 979
d3fb71b3
BW
980int discover_git_directory(struct strbuf *commondir,
981 struct strbuf *gitdir)
16ac8b8d
JS
982{
983 struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT;
984 size_t gitdir_offset = gitdir->len, cwd_len;
d3fb71b3 985 size_t commondir_offset = commondir->len;
16ac8b8d
JS
986 struct repository_format candidate;
987
988 if (strbuf_getcwd(&dir))
d3fb71b3 989 return -1;
16ac8b8d
JS
990
991 cwd_len = dir.len;
01017dce 992 if (setup_git_directory_gently_1(&dir, gitdir, 0) <= 0) {
16ac8b8d 993 strbuf_release(&dir);
d3fb71b3 994 return -1;
16ac8b8d
JS
995 }
996
997 /*
998 * The returned gitdir is relative to dir, and if dir does not reflect
999 * the current working directory, we simply make the gitdir absolute.
1000 */
1001 if (dir.len < cwd_len && !is_absolute_path(gitdir->buf + gitdir_offset)) {
1002 /* Avoid a trailing "/." */
1003 if (!strcmp(".", gitdir->buf + gitdir_offset))
1004 strbuf_setlen(gitdir, gitdir_offset);
1005 else
1006 strbuf_addch(&dir, '/');
1007 strbuf_insert(gitdir, gitdir_offset, dir.buf, dir.len);
1008 }
1009
d3fb71b3
BW
1010 get_common_dir(commondir, gitdir->buf + gitdir_offset);
1011
16ac8b8d 1012 strbuf_reset(&dir);
d3fb71b3 1013 strbuf_addf(&dir, "%s/config", commondir->buf + commondir_offset);
16ac8b8d
JS
1014 read_repository_format(&candidate, dir.buf);
1015 strbuf_release(&dir);
1016
1017 if (verify_repository_format(&candidate, &err) < 0) {
1018 warning("ignoring git dir '%s': %s",
1019 gitdir->buf + gitdir_offset, err.buf);
1020 strbuf_release(&err);
d3fb71b3 1021 strbuf_setlen(commondir, commondir_offset);
69743f9b 1022 strbuf_setlen(gitdir, gitdir_offset);
d3fb71b3 1023 return -1;
16ac8b8d
JS
1024 }
1025
d3fb71b3 1026 return 0;
16ac8b8d
JS
1027}
1028
a60645f9
NTND
1029const char *setup_git_directory_gently(int *nongit_ok)
1030{
ce9b8aab
JS
1031 static struct strbuf cwd = STRBUF_INIT;
1032 struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT;
f9ee2fcd 1033 const char *prefix;
abade65b 1034 struct repository_format repo_fmt;
a60645f9 1035
ce9b8aab
JS
1036 /*
1037 * We may have read an incomplete configuration before
1038 * setting-up the git directory. If so, clear the cache so
1039 * that the next queries to the configuration reload complete
1040 * configuration (including the per-repo config file that we
1041 * ignored previously).
1042 */
1043 git_config_clear();
1044
1045 /*
1046 * Let's assume that we are in a git repository.
1047 * If it turns out later that we are somewhere else, the value will be
1048 * updated accordingly.
1049 */
1050 if (nongit_ok)
1051 *nongit_ok = 0;
1052
1053 if (strbuf_getcwd(&cwd))
1054 die_errno(_("Unable to read current working directory"));
1055 strbuf_addbuf(&dir, &cwd);
1056
01017dce 1057 switch (setup_git_directory_gently_1(&dir, &gitdir, 1)) {
ce9b8aab
JS
1058 case GIT_DIR_NONE:
1059 prefix = NULL;
1060 break;
1061 case GIT_DIR_EXPLICIT:
abade65b 1062 prefix = setup_explicit_git_dir(gitdir.buf, &cwd, &repo_fmt, nongit_ok);
ce9b8aab
JS
1063 break;
1064 case GIT_DIR_DISCOVERED:
1065 if (dir.len < cwd.len && chdir(dir.buf))
fc045fe7 1066 die(_("cannot change to '%s'"), dir.buf);
ce9b8aab 1067 prefix = setup_discovered_git_dir(gitdir.buf, &cwd, dir.len,
abade65b 1068 &repo_fmt, nongit_ok);
ce9b8aab
JS
1069 break;
1070 case GIT_DIR_BARE:
1071 if (dir.len < cwd.len && chdir(dir.buf))
fc045fe7 1072 die(_("cannot change to '%s'"), dir.buf);
abade65b 1073 prefix = setup_bare_git_dir(&cwd, dir.len, &repo_fmt, nongit_ok);
ce9b8aab
JS
1074 break;
1075 case GIT_DIR_HIT_CEILING:
1076 prefix = setup_nongit(cwd.buf, nongit_ok);
1077 break;
1078 case GIT_DIR_HIT_MOUNT_POINT:
1079 if (nongit_ok) {
1080 *nongit_ok = 1;
1081 strbuf_release(&cwd);
1082 strbuf_release(&dir);
1083 return NULL;
1084 }
fc045fe7 1085 die(_("not a git repository (or any parent up to mount point %s)\n"
ce9b8aab
JS
1086 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set)."),
1087 dir.buf);
1088 default:
033abf97 1089 BUG("unhandled setup_git_directory_1() result");
ce9b8aab
JS
1090 }
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 */
c14c234f
BW
1111 if (startup_info->have_repository || getenv(GIT_DIR_ENVIRONMENT)) {
1112 if (!the_repository->gitdir) {
1113 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
1114 if (!gitdir)
1115 gitdir = DEFAULT_GIT_DIR_ENVIRONMENT;
357a03eb 1116 setup_git_env(gitdir);
c14c234f 1117 }
78a67668 1118 if (startup_info->have_repository)
1119 repo_set_hash_algo(the_repository, repo_fmt.hash_algo);
c14c234f 1120 }
73f192c9 1121
ce9b8aab
JS
1122 strbuf_release(&dir);
1123 strbuf_release(&gitdir);
1124
a60645f9
NTND
1125 return prefix;
1126}
1127
94df2506
JH
1128int git_config_perm(const char *var, const char *value)
1129{
06cbe855
HO
1130 int i;
1131 char *endptr;
1132
1133 if (value == NULL)
1134 return PERM_GROUP;
1135
1136 if (!strcmp(value, "umask"))
1137 return PERM_UMASK;
1138 if (!strcmp(value, "group"))
1139 return PERM_GROUP;
1140 if (!strcmp(value, "all") ||
1141 !strcmp(value, "world") ||
1142 !strcmp(value, "everybody"))
1143 return PERM_EVERYBODY;
1144
1145 /* Parse octal numbers */
1146 i = strtol(value, &endptr, 8);
1147
1148 /* If not an octal number, maybe true/false? */
1149 if (*endptr != 0)
1150 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
1151
1152 /*
1153 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 1154 * a chmod value to restrict to.
06cbe855
HO
1155 */
1156 switch (i) {
1157 case PERM_UMASK: /* 0 */
1158 return PERM_UMASK;
1159 case OLD_PERM_GROUP: /* 1 */
1160 return PERM_GROUP;
1161 case OLD_PERM_EVERYBODY: /* 2 */
1162 return PERM_EVERYBODY;
94df2506 1163 }
06cbe855
HO
1164
1165 /* A filemode value was given: 0xxx */
1166
1167 if ((i & 0600) != 0600)
fc045fe7 1168 die(_("problem with core.sharedRepository filemode value "
06cbe855 1169 "(0%.3o).\nThe owner of files must always have "
2ff30e67 1170 "read and write permissions."), i);
06cbe855
HO
1171
1172 /*
1173 * Mask filemode value. Others can not get write permission.
1174 * x flags for directories are handled separately.
1175 */
5a688fe4 1176 return -(i & 0666);
94df2506
JH
1177}
1178
4b0d1eeb 1179void check_repository_format(void)
ab9cb76f 1180{
abade65b 1181 struct repository_format repo_fmt;
1182 check_repository_format_gently(get_git_dir(), &repo_fmt, NULL);
f1c126bd 1183 startup_info->have_repository = 1;
ab9cb76f
JH
1184}
1185
e1e5ec86
CB
1186/*
1187 * Returns the "prefix", a path to the current working directory
1188 * relative to the work tree root, or NULL, if the current working
1189 * directory is not a strict subdirectory of the work tree root. The
1190 * prefix always ends with a '/' character.
1191 */
5e7bfe25
JH
1192const char *setup_git_directory(void)
1193{
b3f66fd3 1194 return setup_git_directory_gently(NULL);
5e7bfe25 1195}
abc06822 1196
40d96325 1197const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
abc06822
FG
1198{
1199 if (is_git_directory(suspect))
1200 return suspect;
40d96325 1201 return read_gitfile_gently(suspect, return_error_code);
abc06822 1202}
1d999ddd
TR
1203
1204/* if any standard file descriptor is missing open it to /dev/null */
1205void sanitize_stdfds(void)
1206{
1207 int fd = open("/dev/null", O_RDWR, 0);
1208 while (fd != -1 && fd < 2)
1209 fd = dup(fd);
1210 if (fd == -1)
fc045fe7 1211 die_errno(_("open /dev/null or dup failed"));
1d999ddd
TR
1212 if (fd > 2)
1213 close(fd);
1214}
de0957ce
NTND
1215
1216int daemonize(void)
1217{
1218#ifdef NO_POSIX_GOODIES
1219 errno = ENOSYS;
1220 return -1;
1221#else
1222 switch (fork()) {
1223 case 0:
1224 break;
1225 case -1:
fc045fe7 1226 die_errno(_("fork failed"));
de0957ce
NTND
1227 default:
1228 exit(0);
1229 }
1230 if (setsid() == -1)
fc045fe7 1231 die_errno(_("setsid failed"));
de0957ce
NTND
1232 close(0);
1233 close(1);
1234 close(2);
1235 sanitize_stdfds();
1236 return 0;
1237#endif
1238}