t0060: add tests for prefix_path when path begins with work tree
[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;
d288a700 7
645a29c4
NTND
8/*
9 * Normalize "path", prepending the "prefix" for relative paths. If
10 * remaining_prefix is not NULL, return the actual prefix still
11 * remains in the path. For example, prefix = sub1/sub2/ and path is
12 *
13 * foo -> sub1/sub2/foo (full prefix)
14 * ../foo -> sub1/foo (remaining prefix is sub1/)
15 * ../../bar -> bar (no remaining prefix)
16 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
17 * `pwd`/../bar -> sub1/bar (no remaining prefix)
18 */
19char *prefix_path_gently(const char *prefix, int len,
20 int *remaining_prefix, const char *path)
d089ebaa
JH
21{
22 const char *orig = path;
18e051a3
CMAB
23 char *sanitized;
24 if (is_absolute_path(orig)) {
e2a57aac 25 const char *temp = real_path(path);
18e051a3
CMAB
26 sanitized = xmalloc(len + strlen(temp) + 1);
27 strcpy(sanitized, temp);
645a29c4
NTND
28 if (remaining_prefix)
29 *remaining_prefix = 0;
18e051a3
CMAB
30 } else {
31 sanitized = xmalloc(len + strlen(path) + 1);
d089ebaa
JH
32 if (len)
33 memcpy(sanitized, prefix, len);
34 strcpy(sanitized + len, path);
645a29c4
NTND
35 if (remaining_prefix)
36 *remaining_prefix = len;
f332726e 37 }
645a29c4 38 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix))
d089ebaa 39 goto error_out;
9a13ba1b 40 if (is_absolute_path(orig)) {
72ec8ba6 41 size_t root_len, len, total;
d089ebaa 42 const char *work_tree = get_git_work_tree();
b3100fd5
JH
43 if (!work_tree)
44 goto error_out;
45 len = strlen(work_tree);
72ec8ba6 46 root_len = offset_1st_component(work_tree);
b3100fd5 47 total = strlen(sanitized) + 1;
d089ebaa 48 if (strncmp(sanitized, work_tree, len) ||
72ec8ba6 49 (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
d089ebaa 50 error_out:
546e0fd9
JK
51 free(sanitized);
52 return NULL;
d089ebaa
JH
53 }
54 if (sanitized[len] == '/')
55 len++;
56 memmove(sanitized, sanitized + len, total - len);
57 }
58 return sanitized;
f332726e
LT
59}
60
546e0fd9
JK
61char *prefix_path(const char *prefix, int len, const char *path)
62{
645a29c4 63 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
64 if (!r)
65 die("'%s' is outside repository", path);
66 return r;
67}
68
69int path_inside_repo(const char *prefix, const char *path)
70{
71 int len = prefix ? strlen(prefix) : 0;
645a29c4 72 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
73 if (r) {
74 free(r);
75 return 1;
76 }
77 return 0;
78}
79
c6e8c800
JH
80int check_filename(const char *prefix, const char *arg)
81{
82 const char *name;
83 struct stat st;
84
4db86e8b
NTND
85 if (!prefixcmp(arg, ":/")) {
86 if (arg[2] == '\0') /* ":/" is root dir, always exists */
87 return 1;
88 name = arg + 2;
89 } else if (prefix)
90 name = prefix_filename(prefix, strlen(prefix), arg);
91 else
92 name = arg;
c6e8c800
JH
93 if (!lstat(name, &st))
94 return 1; /* file exists */
95 if (errno == ENOENT || errno == ENOTDIR)
96 return 0; /* file does not exist */
97 die_errno("failed to stat '%s'", arg);
98}
99
023e37c3
MM
100static void NORETURN die_verify_filename(const char *prefix,
101 const char *arg,
102 int diagnose_misspelt_rev)
009fee47 103{
023e37c3
MM
104 if (!diagnose_misspelt_rev)
105 die("%s: no such path in the working tree.\n"
4d4b5739 106 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
023e37c3 107 arg);
0e539dca
JH
108 /*
109 * Saying "'(icase)foo' does not exist in the index" when the
110 * user gave us ":(icase)foo" is just stupid. A magic pathspec
111 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 112 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
113 */
114 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 115 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 116
009fee47
MM
117 /* ... or fall back the most general message. */
118 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
4d4b5739
MM
119 "Use '--' to separate paths from revisions, like this:\n"
120 "'git <command> [<revision>...] -- [<file>...]'", arg);
009fee47
MM
121
122}
123
e23d0b4a
LT
124/*
125 * Verify a filename that we got as an argument for a pathspec
126 * entry. Note that a filename that begins with "-" never verifies
127 * as true, because even if such a filename were to exist, we want
128 * it to be preceded by the "--" marker (or we want the user to
129 * use a format like "./-filename")
023e37c3
MM
130 *
131 * The "diagnose_misspelt_rev" is used to provide a user-friendly
132 * diagnosis when dying upon finding that "name" is not a pathname.
133 * If set to 1, the diagnosis will try to diagnose "name" as an
134 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
135 * will only complain about an inexisting file.
136 *
137 * This function is typically called to check that a "file or rev"
138 * argument is unambiguous. In this case, the caller will want
139 * diagnose_misspelt_rev == 1 when verifying the first non-rev
140 * argument (which could have been a revision), and
141 * diagnose_misspelt_rev == 0 for the next ones (because we already
142 * saw a filename, there's not ambiguity anymore).
e23d0b4a 143 */
023e37c3
MM
144void verify_filename(const char *prefix,
145 const char *arg,
146 int diagnose_misspelt_rev)
e23d0b4a 147{
e23d0b4a
LT
148 if (*arg == '-')
149 die("bad flag '%s' used after filename", arg);
c6e8c800 150 if (check_filename(prefix, arg))
e23d0b4a 151 return;
023e37c3 152 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
153}
154
ea92f41f
JH
155/*
156 * Opposite of the above: the command line did not have -- marker
157 * and we parsed the arg as a refname. It should not be interpretable
158 * as a filename.
159 */
160void verify_non_filename(const char *prefix, const char *arg)
161{
7ae3df8c 162 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 163 return;
ea92f41f
JH
164 if (*arg == '-')
165 return; /* flag */
c6e8c800
JH
166 if (!check_filename(prefix, arg))
167 return;
168 die("ambiguous argument '%s': both revision and filename\n"
4d4b5739
MM
169 "Use '--' to separate paths from revisions, like this:\n"
170 "'git <command> [<revision>...] -- [<file>...]'", arg);
ea92f41f
JH
171}
172
d288a700 173
5f5608bc 174/*
ad1a382f 175 * Test if it looks like we're at a git directory.
5e7bfe25 176 * We want to see:
5f5608bc 177 *
790296fd 178 * - either an objects/ directory _or_ the proper
5f5608bc 179 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 180 * - a refs/ directory
8098a178 181 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
182 * a proper "ref:", or a regular file HEAD that has a properly
183 * formatted sha1 object name.
5f5608bc 184 */
b3256eb8 185int is_git_directory(const char *suspect)
5f5608bc 186{
ad1a382f
SP
187 char path[PATH_MAX];
188 size_t len = strlen(suspect);
189
3c9d0414
GB
190 if (PATH_MAX <= len + strlen("/objects"))
191 die("Too long path: %.*s", 60, suspect);
ad1a382f
SP
192 strcpy(path, suspect);
193 if (getenv(DB_ENVIRONMENT)) {
194 if (access(getenv(DB_ENVIRONMENT), X_OK))
195 return 0;
196 }
197 else {
198 strcpy(path + len, "/objects");
199 if (access(path, X_OK))
200 return 0;
201 }
202
203 strcpy(path + len, "/refs");
204 if (access(path, X_OK))
8098a178 205 return 0;
ad1a382f
SP
206
207 strcpy(path + len, "/HEAD");
c847f537 208 if (validate_headref(path))
ad1a382f
SP
209 return 0;
210
8098a178 211 return 1;
5f5608bc
LT
212}
213
68025633
JS
214int is_inside_git_dir(void)
215{
e90fdc39
JS
216 if (inside_git_dir < 0)
217 inside_git_dir = is_inside_dir(get_git_dir());
218 return inside_git_dir;
892c41b9
ML
219}
220
892c41b9
ML
221int is_inside_work_tree(void)
222{
e90fdc39
JS
223 if (inside_work_tree < 0)
224 inside_work_tree = is_inside_dir(get_git_work_tree());
225 return inside_work_tree;
892c41b9
ML
226}
227
f3fa1838
JH
228void setup_work_tree(void)
229{
354e6534
JS
230 const char *work_tree, *git_dir;
231 static int initialized = 0;
232
233 if (initialized)
234 return;
235 work_tree = get_git_work_tree();
236 git_dir = get_git_dir();
59f0f2f3 237 if (!is_absolute_path(git_dir))
e2a57aac 238 git_dir = real_path(get_git_dir());
59f0f2f3
MH
239 if (!work_tree || chdir(work_tree))
240 die("This operation must be run in a work tree");
0ed74813
NTND
241
242 /*
243 * Make sure subsequent git processes find correct worktree
244 * if $GIT_WORK_TREE is set relative
245 */
246 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
247 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
248
41894ae3 249 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 250 initialized = 1;
59f0f2f3
MH
251}
252
337e51ce 253static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 254{
337e51ce
NTND
255 char repo_config[PATH_MAX+1];
256
257 /*
258 * git_config() can't be used here because it calls git_pathdup()
259 * to get $GIT_CONFIG/config. That call will make setup_git_env()
260 * set git_dir to ".git".
261 *
262 * We are in gitdir setup, no git dir has been found useable yet.
263 * Use a gentler version of git_config() to check if this repo
264 * is a good one.
265 */
266 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
267 git_config_early(check_repository_format_version, NULL, repo_config);
9459aa77
NTND
268 if (GIT_REPO_VERSION < repository_format_version) {
269 if (!nongit_ok)
270 die ("Expected git repo version <= %d, found %d",
271 GIT_REPO_VERSION, repository_format_version);
272 warning("Expected git repo version <= %d, found %d",
273 GIT_REPO_VERSION, repository_format_version);
274 warning("Please upgrade Git");
275 *nongit_ok = -1;
276 return -1;
277 }
278 return 0;
279}
280
b44ebb19
LH
281/*
282 * Try to read the location of the git directory from the .git file,
283 * return path to git directory if found.
284 */
13d6ec91 285const char *read_gitfile(const char *path)
b44ebb19
LH
286{
287 char *buf;
40c813e0
BK
288 char *dir;
289 const char *slash;
b44ebb19
LH
290 struct stat st;
291 int fd;
b1905aea 292 ssize_t len;
b44ebb19
LH
293
294 if (stat(path, &st))
295 return NULL;
296 if (!S_ISREG(st.st_mode))
297 return NULL;
298 fd = open(path, O_RDONLY);
299 if (fd < 0)
d824cbba 300 die_errno("Error opening '%s'", path);
b44ebb19
LH
301 buf = xmalloc(st.st_size + 1);
302 len = read_in_full(fd, buf, st.st_size);
303 close(fd);
304 if (len != st.st_size)
305 die("Error reading %s", path);
306 buf[len] = '\0';
307 if (prefixcmp(buf, "gitdir: "))
308 die("Invalid gitfile format: %s", path);
309 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
310 len--;
311 if (len < 9)
312 die("No path in gitfile: %s", path);
313 buf[len] = '\0';
40c813e0
BK
314 dir = buf + 8;
315
316 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
317 size_t pathlen = slash+1 - path;
318 size_t dirlen = pathlen + len - 8;
319 dir = xmalloc(dirlen + 1);
320 strncpy(dir, path, pathlen);
321 strncpy(dir + pathlen, buf + 8, len - 8);
322 dir[dirlen] = '\0';
323 free(buf);
324 buf = dir;
325 }
326
327 if (!is_git_directory(dir))
328 die("Not a git repository: %s", dir);
e2a57aac 329 path = real_path(dir);
40c813e0 330
b44ebb19
LH
331 free(buf);
332 return path;
333}
334
e4e30347 335static const char *setup_explicit_git_dir(const char *gitdirenv,
b3f66fd3
NTND
336 char *cwd, int len,
337 int *nongit_ok)
e4e30347 338{
b3f66fd3
NTND
339 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
340 const char *worktree;
341 char *gitfile;
9b125da4 342 int offset;
e4e30347
JN
343
344 if (PATH_MAX - 40 < strlen(gitdirenv))
345 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 346
13d6ec91 347 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
348 if (gitfile) {
349 gitfile = xstrdup(gitfile);
350 gitdirenv = gitfile;
351 }
352
e4e30347
JN
353 if (!is_git_directory(gitdirenv)) {
354 if (nongit_ok) {
355 *nongit_ok = 1;
b3f66fd3 356 free(gitfile);
e4e30347
JN
357 return NULL;
358 }
359 die("Not a git repository: '%s'", gitdirenv);
360 }
b3f66fd3
NTND
361
362 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
363 free(gitfile);
364 return NULL;
e4e30347 365 }
b3f66fd3
NTND
366
367 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
368 if (work_tree_env)
369 set_git_work_tree(work_tree_env);
370 else if (is_bare_repository_cfg > 0) {
371 if (git_work_tree_cfg) /* #22.2, #30 */
372 die("core.bare and core.worktree do not make sense");
373
374 /* #18, #26 */
375 set_git_dir(gitdirenv);
376 free(gitfile);
e4e30347 377 return NULL;
b3f66fd3
NTND
378 }
379 else if (git_work_tree_cfg) { /* #6, #14 */
380 if (is_absolute_path(git_work_tree_cfg))
381 set_git_work_tree(git_work_tree_cfg);
382 else {
383 char core_worktree[PATH_MAX];
384 if (chdir(gitdirenv))
385 die_errno("Could not chdir to '%s'", gitdirenv);
386 if (chdir(git_work_tree_cfg))
387 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
388 if (!getcwd(core_worktree, PATH_MAX))
389 die_errno("Could not get directory '%s'", git_work_tree_cfg);
390 if (chdir(cwd))
391 die_errno("Could not come back to cwd");
392 set_git_work_tree(core_worktree);
393 }
394 }
2cd83d10
JK
395 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
396 /* #16d */
397 set_git_dir(gitdirenv);
398 free(gitfile);
399 return NULL;
400 }
b3f66fd3
NTND
401 else /* #2, #10 */
402 set_git_work_tree(".");
403
404 /* set_git_work_tree() must have been called by now */
405 worktree = get_git_work_tree();
406
407 /* both get_git_work_tree() and cwd are already normalized */
408 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
409 set_git_dir(gitdirenv);
410 free(gitfile);
e4e30347 411 return NULL;
b3f66fd3 412 }
e4e30347 413
9b125da4
NTND
414 offset = dir_inside_of(cwd, worktree);
415 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 416 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
417 if (chdir(worktree))
418 die_errno("Could not chdir to '%s'", worktree);
419 cwd[len++] = '/';
420 cwd[len] = '\0';
421 free(gitfile);
9b125da4 422 return cwd + offset;
93a00542 423 }
b3f66fd3
NTND
424
425 /* cwd outside worktree */
426 set_git_dir(gitdirenv);
427 free(gitfile);
428 return NULL;
93a00542
JN
429}
430
9951d3b3
NTND
431static const char *setup_discovered_git_dir(const char *gitdir,
432 char *cwd, int offset, int len,
433 int *nongit_ok)
98937bef 434{
9951d3b3
NTND
435 if (check_repository_format_gently(gitdir, nongit_ok))
436 return NULL;
98937bef 437
4868b2ea
JN
438 /* --work-tree is set without --git-dir; use discovered one */
439 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
440 if (offset != len && !is_absolute_path(gitdir))
e2a57aac 441 gitdir = xstrdup(real_path(gitdir));
4868b2ea
JN
442 if (chdir(cwd))
443 die_errno("Could not come back to cwd");
444 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
445 }
446
9951d3b3
NTND
447 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
448 if (is_bare_repository_cfg > 0) {
e2a57aac 449 set_git_dir(offset == len ? gitdir : real_path(gitdir));
9951d3b3
NTND
450 if (chdir(cwd))
451 die_errno("Could not come back to cwd");
98937bef 452 return NULL;
9951d3b3 453 }
98937bef 454
9951d3b3
NTND
455 /* #0, #1, #5, #8, #9, #12, #13 */
456 set_git_work_tree(".");
457 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
458 set_git_dir(gitdir);
98937bef 459 inside_git_dir = 0;
9951d3b3 460 inside_work_tree = 1;
98937bef
NTND
461 if (offset == len)
462 return NULL;
463
464 /* Make "offset" point to past the '/', and add a '/' at the end */
465 offset++;
466 cwd[len++] = '/';
467 cwd[len] = 0;
468 return cwd + offset;
469}
470
1cd8031b
NTND
471/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
472static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
68698da5
JN
473{
474 int root_len;
475
1cd8031b
NTND
476 if (check_repository_format_gently(".", nongit_ok))
477 return NULL;
478
2cd83d10
JK
479 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
480
4868b2ea
JN
481 /* --work-tree is set without --git-dir; use discovered one */
482 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
483 const char *gitdir;
484
485 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
486 if (chdir(cwd))
487 die_errno("Could not come back to cwd");
488 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
489 }
490
68698da5 491 inside_git_dir = 1;
1cd8031b 492 inside_work_tree = 0;
68698da5 493 if (offset != len) {
8fc0ae80
NTND
494 if (chdir(cwd))
495 die_errno("Cannot come back to cwd");
68698da5
JN
496 root_len = offset_1st_component(cwd);
497 cwd[offset > root_len ? offset : root_len] = '\0';
498 set_git_dir(cwd);
337e51ce 499 }
1cd8031b 500 else
68698da5 501 set_git_dir(".");
68698da5
JN
502 return NULL;
503}
504
f161edeb
JN
505static const char *setup_nongit(const char *cwd, int *nongit_ok)
506{
507 if (!nongit_ok)
508 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
509 if (chdir(cwd))
510 die_errno("Cannot come back to cwd");
511 *nongit_ok = 1;
512 return NULL;
513}
514
2565b43b 515static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
516{
517 struct stat buf;
2565b43b
CB
518 if (stat(path, &buf)) {
519 die_errno("failed to stat '%*s%s%s'",
520 prefix_len,
60c98d1e
JN
521 prefix ? prefix : "",
522 prefix ? "/" : "", path);
2565b43b 523 }
60c98d1e
JN
524 return buf.st_dev;
525}
526
9e2326c7 527/*
1b77d83c
MH
528 * A "string_list_each_func_t" function that canonicalizes an entry
529 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
530 * discards it if unusable. The presence of an empty entry in
531 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
532 * subsequent entries.
9e2326c7 533 */
1b77d83c 534static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 535 void *cb_data)
9e2326c7 536{
7ec30aaa 537 int *empty_entry_found = cb_data;
1b77d83c 538 char *ceil = item->string;
9e2326c7 539
7ec30aaa
MH
540 if (!*ceil) {
541 *empty_entry_found = 1;
9e2326c7 542 return 0;
7ec30aaa 543 } else if (!is_absolute_path(ceil)) {
9e2326c7 544 return 0;
7ec30aaa
MH
545 } else if (*empty_entry_found) {
546 /* Keep entry but do not canonicalize it */
547 return 1;
548 } else {
549 const char *real_path = real_path_if_valid(ceil);
550 if (!real_path)
551 return 0;
552 free(item->string);
553 item->string = xstrdup(real_path);
554 return 1;
555 }
9e2326c7
MH
556}
557
e90fdc39
JS
558/*
559 * We cannot decide in this function whether we are in the work tree or
560 * not, since the config can only be read _after_ this function was called.
561 */
a60645f9 562static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 563{
0454dd93 564 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 565 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
abf03eeb 566 static char cwd[PATH_MAX + 1];
9951d3b3
NTND
567 const char *gitdirenv, *ret;
568 char *gitfile;
31171d9e 569 int len, offset, offset_parent, ceil_offset = -1;
c7d1d1b1
RH
570 dev_t current_device = 0;
571 int one_filesystem = 1;
d288a700 572
af05d679
SG
573 /*
574 * Let's assume that we are in a git repository.
575 * If it turns out later that we are somewhere else, the value will be
576 * updated accordingly.
577 */
578 if (nongit_ok)
579 *nongit_ok = 0;
580
abf03eeb 581 if (!getcwd(cwd, sizeof(cwd) - 1))
b3f66fd3
NTND
582 die_errno("Unable to read current working directory");
583 offset = len = strlen(cwd);
584
e90fdc39
JS
585 /*
586 * If GIT_DIR is set explicitly, we're not going
587 * to do any discovery, but we still do repository
588 * validation.
589 */
ad1a382f 590 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e4e30347 591 if (gitdirenv)
b3f66fd3 592 return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
d288a700 593
31171d9e 594 if (env_ceiling_dirs) {
7ec30aaa
MH
595 int empty_entry_found = 0;
596
31171d9e 597 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 598 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 599 canonicalize_ceiling_entry, &empty_entry_found);
31171d9e
MH
600 ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs);
601 string_list_clear(&ceiling_dirs, 0);
602 }
603
17d778e7
JH
604 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
605 ceil_offset = 1;
d288a700 606
892c41b9 607 /*
e90fdc39 608 * Test in the following order (relative to the cwd):
b44ebb19 609 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
610 * - .git/
611 * - ./ (bare)
b44ebb19 612 * - ../.git
e90fdc39
JS
613 * - ../.git/
614 * - ../ (bare)
615 * - ../../.git/
616 * etc.
892c41b9 617 */
cf87463e 618 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 619 if (one_filesystem)
2565b43b 620 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 621 for (;;) {
13d6ec91 622 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
623 if (gitfile)
624 gitdirenv = gitfile = xstrdup(gitfile);
625 else {
626 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
627 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
628 }
629
630 if (gitdirenv) {
631 ret = setup_discovered_git_dir(gitdirenv,
632 cwd, offset, len,
633 nongit_ok);
634 free(gitfile);
635 return ret;
636 }
637 free(gitfile);
638
68698da5 639 if (is_git_directory("."))
1cd8031b
NTND
640 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
641
2565b43b
CB
642 offset_parent = offset;
643 while (--offset_parent > ceil_offset && cwd[offset_parent] != '/');
644 if (offset_parent <= ceil_offset)
f161edeb 645 return setup_nongit(cwd, nongit_ok);
8030e442 646 if (one_filesystem) {
2565b43b 647 dev_t parent_device = get_device_or_die("..", cwd, offset);
60c98d1e 648 if (parent_device != current_device) {
8030e442
LD
649 if (nongit_ok) {
650 if (chdir(cwd))
651 die_errno("Cannot come back to cwd");
652 *nongit_ok = 1;
653 return NULL;
654 }
655 cwd[offset] = '\0';
2565b43b 656 die("Not a git repository (or any parent up to mount point %s)\n"
cf87463e 657 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
8030e442
LD
658 }
659 }
502ffe34
LD
660 if (chdir("..")) {
661 cwd[offset] = '\0';
d824cbba 662 die_errno("Cannot change to '%s/..'", cwd);
502ffe34 663 }
2565b43b 664 offset = offset_parent;
892c41b9 665 }
d288a700 666}
5e7bfe25 667
a60645f9
NTND
668const char *setup_git_directory_gently(int *nongit_ok)
669{
670 const char *prefix;
671
672 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f 673 if (prefix)
a6f7f9a3 674 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 675 else
a6f7f9a3 676 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 677
f07d6a1a 678 if (startup_info) {
a60645f9 679 startup_info->have_repository = !nongit_ok || !*nongit_ok;
f07d6a1a
NTND
680 startup_info->prefix = prefix;
681 }
a60645f9
NTND
682 return prefix;
683}
684
94df2506
JH
685int git_config_perm(const char *var, const char *value)
686{
06cbe855
HO
687 int i;
688 char *endptr;
689
690 if (value == NULL)
691 return PERM_GROUP;
692
693 if (!strcmp(value, "umask"))
694 return PERM_UMASK;
695 if (!strcmp(value, "group"))
696 return PERM_GROUP;
697 if (!strcmp(value, "all") ||
698 !strcmp(value, "world") ||
699 !strcmp(value, "everybody"))
700 return PERM_EVERYBODY;
701
702 /* Parse octal numbers */
703 i = strtol(value, &endptr, 8);
704
705 /* If not an octal number, maybe true/false? */
706 if (*endptr != 0)
707 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
708
709 /*
710 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 711 * a chmod value to restrict to.
06cbe855
HO
712 */
713 switch (i) {
714 case PERM_UMASK: /* 0 */
715 return PERM_UMASK;
716 case OLD_PERM_GROUP: /* 1 */
717 return PERM_GROUP;
718 case OLD_PERM_EVERYBODY: /* 2 */
719 return PERM_EVERYBODY;
94df2506 720 }
06cbe855
HO
721
722 /* A filemode value was given: 0xxx */
723
724 if ((i & 0600) != 0600)
725 die("Problem with core.sharedRepository filemode value "
726 "(0%.3o).\nThe owner of files must always have "
727 "read and write permissions.", i);
728
729 /*
730 * Mask filemode value. Others can not get write permission.
731 * x flags for directories are handled separately.
732 */
5a688fe4 733 return -(i & 0666);
94df2506
JH
734}
735
ef90d6d4 736int check_repository_format_version(const char *var, const char *value, void *cb)
ab9cb76f 737{
299726d5
JS
738 if (strcmp(var, "core.repositoryformatversion") == 0)
739 repository_format_version = git_config_int(var, value);
457f06d6 740 else if (strcmp(var, "core.sharedrepository") == 0)
94df2506 741 shared_repository = git_config_perm(var, value);
e90fdc39
JS
742 else if (strcmp(var, "core.bare") == 0) {
743 is_bare_repository_cfg = git_config_bool(var, value);
744 if (is_bare_repository_cfg == 1)
745 inside_work_tree = -1;
746 } else if (strcmp(var, "core.worktree") == 0) {
180483c5
JH
747 if (!value)
748 return config_error_nonbool(var);
8e0f7003 749 free(git_work_tree_cfg);
e90fdc39
JS
750 git_work_tree_cfg = xstrdup(value);
751 inside_work_tree = -1;
752 }
299726d5 753 return 0;
ab9cb76f
JH
754}
755
756int check_repository_format(void)
757{
337e51ce 758 return check_repository_format_gently(get_git_dir(), NULL);
ab9cb76f
JH
759}
760
e1e5ec86
CB
761/*
762 * Returns the "prefix", a path to the current working directory
763 * relative to the work tree root, or NULL, if the current working
764 * directory is not a strict subdirectory of the work tree root. The
765 * prefix always ends with a '/' character.
766 */
5e7bfe25
JH
767const char *setup_git_directory(void)
768{
b3f66fd3 769 return setup_git_directory_gently(NULL);
5e7bfe25 770}
abc06822
FG
771
772const char *resolve_gitdir(const char *suspect)
773{
774 if (is_git_directory(suspect))
775 return suspect;
efc5fb6a 776 return read_gitfile(suspect);
abc06822 777}
1d999ddd
TR
778
779/* if any standard file descriptor is missing open it to /dev/null */
780void sanitize_stdfds(void)
781{
782 int fd = open("/dev/null", O_RDWR, 0);
783 while (fd != -1 && fd < 2)
784 fd = dup(fd);
785 if (fd == -1)
786 die_errno("open /dev/null or dup failed");
787 if (fd > 2)
788 close(fd);
789}