rename field "raw" to "_raw" in struct pathspec
[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
546e0fd9 8static char *prefix_path_gently(const char *prefix, int len, const char *path)
d089ebaa
JH
9{
10 const char *orig = path;
18e051a3
CMAB
11 char *sanitized;
12 if (is_absolute_path(orig)) {
e2a57aac 13 const char *temp = real_path(path);
18e051a3
CMAB
14 sanitized = xmalloc(len + strlen(temp) + 1);
15 strcpy(sanitized, temp);
16 } else {
17 sanitized = xmalloc(len + strlen(path) + 1);
d089ebaa
JH
18 if (len)
19 memcpy(sanitized, prefix, len);
20 strcpy(sanitized + len, path);
f332726e 21 }
f3cad0ad 22 if (normalize_path_copy(sanitized, sanitized))
d089ebaa 23 goto error_out;
9a13ba1b 24 if (is_absolute_path(orig)) {
72ec8ba6 25 size_t root_len, len, total;
d089ebaa 26 const char *work_tree = get_git_work_tree();
b3100fd5
JH
27 if (!work_tree)
28 goto error_out;
29 len = strlen(work_tree);
72ec8ba6 30 root_len = offset_1st_component(work_tree);
b3100fd5 31 total = strlen(sanitized) + 1;
d089ebaa 32 if (strncmp(sanitized, work_tree, len) ||
72ec8ba6 33 (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
d089ebaa 34 error_out:
546e0fd9
JK
35 free(sanitized);
36 return NULL;
d089ebaa
JH
37 }
38 if (sanitized[len] == '/')
39 len++;
40 memmove(sanitized, sanitized + len, total - len);
41 }
42 return sanitized;
f332726e
LT
43}
44
546e0fd9
JK
45char *prefix_path(const char *prefix, int len, const char *path)
46{
47 char *r = prefix_path_gently(prefix, len, path);
48 if (!r)
49 die("'%s' is outside repository", path);
50 return r;
51}
52
53int path_inside_repo(const char *prefix, const char *path)
54{
55 int len = prefix ? strlen(prefix) : 0;
56 char *r = prefix_path_gently(prefix, len, path);
57 if (r) {
58 free(r);
59 return 1;
60 }
61 return 0;
62}
63
c6e8c800
JH
64int check_filename(const char *prefix, const char *arg)
65{
66 const char *name;
67 struct stat st;
68
4db86e8b
NTND
69 if (!prefixcmp(arg, ":/")) {
70 if (arg[2] == '\0') /* ":/" is root dir, always exists */
71 return 1;
72 name = arg + 2;
73 } else if (prefix)
74 name = prefix_filename(prefix, strlen(prefix), arg);
75 else
76 name = arg;
c6e8c800
JH
77 if (!lstat(name, &st))
78 return 1; /* file exists */
79 if (errno == ENOENT || errno == ENOTDIR)
80 return 0; /* file does not exist */
81 die_errno("failed to stat '%s'", arg);
82}
83
023e37c3
MM
84static void NORETURN die_verify_filename(const char *prefix,
85 const char *arg,
86 int diagnose_misspelt_rev)
009fee47 87{
023e37c3
MM
88 if (!diagnose_misspelt_rev)
89 die("%s: no such path in the working tree.\n"
4d4b5739 90 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
023e37c3 91 arg);
0e539dca
JH
92 /*
93 * Saying "'(icase)foo' does not exist in the index" when the
94 * user gave us ":(icase)foo" is just stupid. A magic pathspec
95 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 96 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
97 */
98 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 99 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 100
009fee47
MM
101 /* ... or fall back the most general message. */
102 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
4d4b5739
MM
103 "Use '--' to separate paths from revisions, like this:\n"
104 "'git <command> [<revision>...] -- [<file>...]'", arg);
009fee47
MM
105
106}
107
e23d0b4a
LT
108/*
109 * Verify a filename that we got as an argument for a pathspec
110 * entry. Note that a filename that begins with "-" never verifies
111 * as true, because even if such a filename were to exist, we want
112 * it to be preceded by the "--" marker (or we want the user to
113 * use a format like "./-filename")
023e37c3
MM
114 *
115 * The "diagnose_misspelt_rev" is used to provide a user-friendly
116 * diagnosis when dying upon finding that "name" is not a pathname.
117 * If set to 1, the diagnosis will try to diagnose "name" as an
118 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
119 * will only complain about an inexisting file.
120 *
121 * This function is typically called to check that a "file or rev"
122 * argument is unambiguous. In this case, the caller will want
123 * diagnose_misspelt_rev == 1 when verifying the first non-rev
124 * argument (which could have been a revision), and
125 * diagnose_misspelt_rev == 0 for the next ones (because we already
126 * saw a filename, there's not ambiguity anymore).
e23d0b4a 127 */
023e37c3
MM
128void verify_filename(const char *prefix,
129 const char *arg,
130 int diagnose_misspelt_rev)
e23d0b4a 131{
e23d0b4a
LT
132 if (*arg == '-')
133 die("bad flag '%s' used after filename", arg);
c6e8c800 134 if (check_filename(prefix, arg))
e23d0b4a 135 return;
023e37c3 136 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
137}
138
ea92f41f
JH
139/*
140 * Opposite of the above: the command line did not have -- marker
141 * and we parsed the arg as a refname. It should not be interpretable
142 * as a filename.
143 */
144void verify_non_filename(const char *prefix, const char *arg)
145{
7ae3df8c 146 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 147 return;
ea92f41f
JH
148 if (*arg == '-')
149 return; /* flag */
c6e8c800
JH
150 if (!check_filename(prefix, arg))
151 return;
152 die("ambiguous argument '%s': both revision and filename\n"
4d4b5739
MM
153 "Use '--' to separate paths from revisions, like this:\n"
154 "'git <command> [<revision>...] -- [<file>...]'", arg);
ea92f41f
JH
155}
156
d288a700 157
5f5608bc 158/*
ad1a382f 159 * Test if it looks like we're at a git directory.
5e7bfe25 160 * We want to see:
5f5608bc 161 *
790296fd 162 * - either an objects/ directory _or_ the proper
5f5608bc 163 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 164 * - a refs/ directory
8098a178 165 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
166 * a proper "ref:", or a regular file HEAD that has a properly
167 * formatted sha1 object name.
5f5608bc 168 */
b3256eb8 169int is_git_directory(const char *suspect)
5f5608bc 170{
ad1a382f
SP
171 char path[PATH_MAX];
172 size_t len = strlen(suspect);
173
3c9d0414
GB
174 if (PATH_MAX <= len + strlen("/objects"))
175 die("Too long path: %.*s", 60, suspect);
ad1a382f
SP
176 strcpy(path, suspect);
177 if (getenv(DB_ENVIRONMENT)) {
178 if (access(getenv(DB_ENVIRONMENT), X_OK))
179 return 0;
180 }
181 else {
182 strcpy(path + len, "/objects");
183 if (access(path, X_OK))
184 return 0;
185 }
186
187 strcpy(path + len, "/refs");
188 if (access(path, X_OK))
8098a178 189 return 0;
ad1a382f
SP
190
191 strcpy(path + len, "/HEAD");
c847f537 192 if (validate_headref(path))
ad1a382f
SP
193 return 0;
194
8098a178 195 return 1;
5f5608bc
LT
196}
197
68025633
JS
198int is_inside_git_dir(void)
199{
e90fdc39
JS
200 if (inside_git_dir < 0)
201 inside_git_dir = is_inside_dir(get_git_dir());
202 return inside_git_dir;
892c41b9
ML
203}
204
892c41b9
ML
205int is_inside_work_tree(void)
206{
e90fdc39
JS
207 if (inside_work_tree < 0)
208 inside_work_tree = is_inside_dir(get_git_work_tree());
209 return inside_work_tree;
892c41b9
ML
210}
211
f3fa1838
JH
212void setup_work_tree(void)
213{
354e6534
JS
214 const char *work_tree, *git_dir;
215 static int initialized = 0;
216
217 if (initialized)
218 return;
219 work_tree = get_git_work_tree();
220 git_dir = get_git_dir();
59f0f2f3 221 if (!is_absolute_path(git_dir))
e2a57aac 222 git_dir = real_path(get_git_dir());
59f0f2f3
MH
223 if (!work_tree || chdir(work_tree))
224 die("This operation must be run in a work tree");
0ed74813
NTND
225
226 /*
227 * Make sure subsequent git processes find correct worktree
228 * if $GIT_WORK_TREE is set relative
229 */
230 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
231 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
232
e2a57aac 233 set_git_dir(relative_path(git_dir, work_tree));
354e6534 234 initialized = 1;
59f0f2f3
MH
235}
236
337e51ce 237static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 238{
337e51ce
NTND
239 char repo_config[PATH_MAX+1];
240
241 /*
242 * git_config() can't be used here because it calls git_pathdup()
243 * to get $GIT_CONFIG/config. That call will make setup_git_env()
244 * set git_dir to ".git".
245 *
246 * We are in gitdir setup, no git dir has been found useable yet.
247 * Use a gentler version of git_config() to check if this repo
248 * is a good one.
249 */
250 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
251 git_config_early(check_repository_format_version, NULL, repo_config);
9459aa77
NTND
252 if (GIT_REPO_VERSION < repository_format_version) {
253 if (!nongit_ok)
254 die ("Expected git repo version <= %d, found %d",
255 GIT_REPO_VERSION, repository_format_version);
256 warning("Expected git repo version <= %d, found %d",
257 GIT_REPO_VERSION, repository_format_version);
258 warning("Please upgrade Git");
259 *nongit_ok = -1;
260 return -1;
261 }
262 return 0;
263}
264
b44ebb19
LH
265/*
266 * Try to read the location of the git directory from the .git file,
267 * return path to git directory if found.
268 */
13d6ec91 269const char *read_gitfile(const char *path)
b44ebb19
LH
270{
271 char *buf;
40c813e0
BK
272 char *dir;
273 const char *slash;
b44ebb19
LH
274 struct stat st;
275 int fd;
b1905aea 276 ssize_t len;
b44ebb19
LH
277
278 if (stat(path, &st))
279 return NULL;
280 if (!S_ISREG(st.st_mode))
281 return NULL;
282 fd = open(path, O_RDONLY);
283 if (fd < 0)
d824cbba 284 die_errno("Error opening '%s'", path);
b44ebb19
LH
285 buf = xmalloc(st.st_size + 1);
286 len = read_in_full(fd, buf, st.st_size);
287 close(fd);
288 if (len != st.st_size)
289 die("Error reading %s", path);
290 buf[len] = '\0';
291 if (prefixcmp(buf, "gitdir: "))
292 die("Invalid gitfile format: %s", path);
293 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
294 len--;
295 if (len < 9)
296 die("No path in gitfile: %s", path);
297 buf[len] = '\0';
40c813e0
BK
298 dir = buf + 8;
299
300 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
301 size_t pathlen = slash+1 - path;
302 size_t dirlen = pathlen + len - 8;
303 dir = xmalloc(dirlen + 1);
304 strncpy(dir, path, pathlen);
305 strncpy(dir + pathlen, buf + 8, len - 8);
306 dir[dirlen] = '\0';
307 free(buf);
308 buf = dir;
309 }
310
311 if (!is_git_directory(dir))
312 die("Not a git repository: %s", dir);
e2a57aac 313 path = real_path(dir);
40c813e0 314
b44ebb19
LH
315 free(buf);
316 return path;
317}
318
e4e30347 319static const char *setup_explicit_git_dir(const char *gitdirenv,
b3f66fd3
NTND
320 char *cwd, int len,
321 int *nongit_ok)
e4e30347 322{
b3f66fd3
NTND
323 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
324 const char *worktree;
325 char *gitfile;
9b125da4 326 int offset;
e4e30347
JN
327
328 if (PATH_MAX - 40 < strlen(gitdirenv))
329 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 330
13d6ec91 331 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
332 if (gitfile) {
333 gitfile = xstrdup(gitfile);
334 gitdirenv = gitfile;
335 }
336
e4e30347
JN
337 if (!is_git_directory(gitdirenv)) {
338 if (nongit_ok) {
339 *nongit_ok = 1;
b3f66fd3 340 free(gitfile);
e4e30347
JN
341 return NULL;
342 }
343 die("Not a git repository: '%s'", gitdirenv);
344 }
b3f66fd3
NTND
345
346 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
347 free(gitfile);
348 return NULL;
e4e30347 349 }
b3f66fd3
NTND
350
351 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
352 if (work_tree_env)
353 set_git_work_tree(work_tree_env);
354 else if (is_bare_repository_cfg > 0) {
355 if (git_work_tree_cfg) /* #22.2, #30 */
356 die("core.bare and core.worktree do not make sense");
357
358 /* #18, #26 */
359 set_git_dir(gitdirenv);
360 free(gitfile);
e4e30347 361 return NULL;
b3f66fd3
NTND
362 }
363 else if (git_work_tree_cfg) { /* #6, #14 */
364 if (is_absolute_path(git_work_tree_cfg))
365 set_git_work_tree(git_work_tree_cfg);
366 else {
367 char core_worktree[PATH_MAX];
368 if (chdir(gitdirenv))
369 die_errno("Could not chdir to '%s'", gitdirenv);
370 if (chdir(git_work_tree_cfg))
371 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
372 if (!getcwd(core_worktree, PATH_MAX))
373 die_errno("Could not get directory '%s'", git_work_tree_cfg);
374 if (chdir(cwd))
375 die_errno("Could not come back to cwd");
376 set_git_work_tree(core_worktree);
377 }
378 }
2cd83d10
JK
379 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
380 /* #16d */
381 set_git_dir(gitdirenv);
382 free(gitfile);
383 return NULL;
384 }
b3f66fd3
NTND
385 else /* #2, #10 */
386 set_git_work_tree(".");
387
388 /* set_git_work_tree() must have been called by now */
389 worktree = get_git_work_tree();
390
391 /* both get_git_work_tree() and cwd are already normalized */
392 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
393 set_git_dir(gitdirenv);
394 free(gitfile);
e4e30347 395 return NULL;
b3f66fd3 396 }
e4e30347 397
9b125da4
NTND
398 offset = dir_inside_of(cwd, worktree);
399 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 400 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
401 if (chdir(worktree))
402 die_errno("Could not chdir to '%s'", worktree);
403 cwd[len++] = '/';
404 cwd[len] = '\0';
405 free(gitfile);
9b125da4 406 return cwd + offset;
93a00542 407 }
b3f66fd3
NTND
408
409 /* cwd outside worktree */
410 set_git_dir(gitdirenv);
411 free(gitfile);
412 return NULL;
93a00542
JN
413}
414
9951d3b3
NTND
415static const char *setup_discovered_git_dir(const char *gitdir,
416 char *cwd, int offset, int len,
417 int *nongit_ok)
98937bef 418{
9951d3b3
NTND
419 if (check_repository_format_gently(gitdir, nongit_ok))
420 return NULL;
98937bef 421
4868b2ea
JN
422 /* --work-tree is set without --git-dir; use discovered one */
423 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
424 if (offset != len && !is_absolute_path(gitdir))
e2a57aac 425 gitdir = xstrdup(real_path(gitdir));
4868b2ea
JN
426 if (chdir(cwd))
427 die_errno("Could not come back to cwd");
428 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
429 }
430
9951d3b3
NTND
431 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
432 if (is_bare_repository_cfg > 0) {
e2a57aac 433 set_git_dir(offset == len ? gitdir : real_path(gitdir));
9951d3b3
NTND
434 if (chdir(cwd))
435 die_errno("Could not come back to cwd");
98937bef 436 return NULL;
9951d3b3 437 }
98937bef 438
9951d3b3
NTND
439 /* #0, #1, #5, #8, #9, #12, #13 */
440 set_git_work_tree(".");
441 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
442 set_git_dir(gitdir);
98937bef 443 inside_git_dir = 0;
9951d3b3 444 inside_work_tree = 1;
98937bef
NTND
445 if (offset == len)
446 return NULL;
447
448 /* Make "offset" point to past the '/', and add a '/' at the end */
449 offset++;
450 cwd[len++] = '/';
451 cwd[len] = 0;
452 return cwd + offset;
453}
454
1cd8031b
NTND
455/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
456static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
68698da5
JN
457{
458 int root_len;
459
1cd8031b
NTND
460 if (check_repository_format_gently(".", nongit_ok))
461 return NULL;
462
2cd83d10
JK
463 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
464
4868b2ea
JN
465 /* --work-tree is set without --git-dir; use discovered one */
466 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
467 const char *gitdir;
468
469 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
470 if (chdir(cwd))
471 die_errno("Could not come back to cwd");
472 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
473 }
474
68698da5 475 inside_git_dir = 1;
1cd8031b 476 inside_work_tree = 0;
68698da5 477 if (offset != len) {
8fc0ae80
NTND
478 if (chdir(cwd))
479 die_errno("Cannot come back to cwd");
68698da5
JN
480 root_len = offset_1st_component(cwd);
481 cwd[offset > root_len ? offset : root_len] = '\0';
482 set_git_dir(cwd);
337e51ce 483 }
1cd8031b 484 else
68698da5 485 set_git_dir(".");
68698da5
JN
486 return NULL;
487}
488
f161edeb
JN
489static const char *setup_nongit(const char *cwd, int *nongit_ok)
490{
491 if (!nongit_ok)
492 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
493 if (chdir(cwd))
494 die_errno("Cannot come back to cwd");
495 *nongit_ok = 1;
496 return NULL;
497}
498
2565b43b 499static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
500{
501 struct stat buf;
2565b43b
CB
502 if (stat(path, &buf)) {
503 die_errno("failed to stat '%*s%s%s'",
504 prefix_len,
60c98d1e
JN
505 prefix ? prefix : "",
506 prefix ? "/" : "", path);
2565b43b 507 }
60c98d1e
JN
508 return buf.st_dev;
509}
510
9e2326c7 511/*
1b77d83c
MH
512 * A "string_list_each_func_t" function that canonicalizes an entry
513 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
514 * discards it if unusable. The presence of an empty entry in
515 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
516 * subsequent entries.
9e2326c7 517 */
1b77d83c 518static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 519 void *cb_data)
9e2326c7 520{
7ec30aaa 521 int *empty_entry_found = cb_data;
1b77d83c 522 char *ceil = item->string;
9e2326c7 523
7ec30aaa
MH
524 if (!*ceil) {
525 *empty_entry_found = 1;
9e2326c7 526 return 0;
7ec30aaa 527 } else if (!is_absolute_path(ceil)) {
9e2326c7 528 return 0;
7ec30aaa
MH
529 } else if (*empty_entry_found) {
530 /* Keep entry but do not canonicalize it */
531 return 1;
532 } else {
533 const char *real_path = real_path_if_valid(ceil);
534 if (!real_path)
535 return 0;
536 free(item->string);
537 item->string = xstrdup(real_path);
538 return 1;
539 }
9e2326c7
MH
540}
541
e90fdc39
JS
542/*
543 * We cannot decide in this function whether we are in the work tree or
544 * not, since the config can only be read _after_ this function was called.
545 */
a60645f9 546static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 547{
0454dd93 548 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 549 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
d288a700 550 static char cwd[PATH_MAX+1];
9951d3b3
NTND
551 const char *gitdirenv, *ret;
552 char *gitfile;
31171d9e 553 int len, offset, offset_parent, ceil_offset = -1;
c7d1d1b1
RH
554 dev_t current_device = 0;
555 int one_filesystem = 1;
d288a700 556
af05d679
SG
557 /*
558 * Let's assume that we are in a git repository.
559 * If it turns out later that we are somewhere else, the value will be
560 * updated accordingly.
561 */
562 if (nongit_ok)
563 *nongit_ok = 0;
564
b3f66fd3
NTND
565 if (!getcwd(cwd, sizeof(cwd)-1))
566 die_errno("Unable to read current working directory");
567 offset = len = strlen(cwd);
568
e90fdc39
JS
569 /*
570 * If GIT_DIR is set explicitly, we're not going
571 * to do any discovery, but we still do repository
572 * validation.
573 */
ad1a382f 574 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e4e30347 575 if (gitdirenv)
b3f66fd3 576 return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
d288a700 577
31171d9e 578 if (env_ceiling_dirs) {
7ec30aaa
MH
579 int empty_entry_found = 0;
580
31171d9e 581 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 582 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 583 canonicalize_ceiling_entry, &empty_entry_found);
31171d9e
MH
584 ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs);
585 string_list_clear(&ceiling_dirs, 0);
586 }
587
17d778e7
JH
588 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
589 ceil_offset = 1;
d288a700 590
892c41b9 591 /*
e90fdc39 592 * Test in the following order (relative to the cwd):
b44ebb19 593 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
594 * - .git/
595 * - ./ (bare)
b44ebb19 596 * - ../.git
e90fdc39
JS
597 * - ../.git/
598 * - ../ (bare)
599 * - ../../.git/
600 * etc.
892c41b9 601 */
cf87463e 602 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 603 if (one_filesystem)
2565b43b 604 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 605 for (;;) {
13d6ec91 606 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
607 if (gitfile)
608 gitdirenv = gitfile = xstrdup(gitfile);
609 else {
610 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
611 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
612 }
613
614 if (gitdirenv) {
615 ret = setup_discovered_git_dir(gitdirenv,
616 cwd, offset, len,
617 nongit_ok);
618 free(gitfile);
619 return ret;
620 }
621 free(gitfile);
622
68698da5 623 if (is_git_directory("."))
1cd8031b
NTND
624 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
625
2565b43b
CB
626 offset_parent = offset;
627 while (--offset_parent > ceil_offset && cwd[offset_parent] != '/');
628 if (offset_parent <= ceil_offset)
f161edeb 629 return setup_nongit(cwd, nongit_ok);
8030e442 630 if (one_filesystem) {
2565b43b 631 dev_t parent_device = get_device_or_die("..", cwd, offset);
60c98d1e 632 if (parent_device != current_device) {
8030e442
LD
633 if (nongit_ok) {
634 if (chdir(cwd))
635 die_errno("Cannot come back to cwd");
636 *nongit_ok = 1;
637 return NULL;
638 }
639 cwd[offset] = '\0';
2565b43b 640 die("Not a git repository (or any parent up to mount point %s)\n"
cf87463e 641 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
8030e442
LD
642 }
643 }
502ffe34
LD
644 if (chdir("..")) {
645 cwd[offset] = '\0';
d824cbba 646 die_errno("Cannot change to '%s/..'", cwd);
502ffe34 647 }
2565b43b 648 offset = offset_parent;
892c41b9 649 }
d288a700 650}
5e7bfe25 651
a60645f9
NTND
652const char *setup_git_directory_gently(int *nongit_ok)
653{
654 const char *prefix;
655
656 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f 657 if (prefix)
a6f7f9a3 658 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 659 else
a6f7f9a3 660 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 661
f07d6a1a 662 if (startup_info) {
a60645f9 663 startup_info->have_repository = !nongit_ok || !*nongit_ok;
f07d6a1a
NTND
664 startup_info->prefix = prefix;
665 }
a60645f9
NTND
666 return prefix;
667}
668
94df2506
JH
669int git_config_perm(const char *var, const char *value)
670{
06cbe855
HO
671 int i;
672 char *endptr;
673
674 if (value == NULL)
675 return PERM_GROUP;
676
677 if (!strcmp(value, "umask"))
678 return PERM_UMASK;
679 if (!strcmp(value, "group"))
680 return PERM_GROUP;
681 if (!strcmp(value, "all") ||
682 !strcmp(value, "world") ||
683 !strcmp(value, "everybody"))
684 return PERM_EVERYBODY;
685
686 /* Parse octal numbers */
687 i = strtol(value, &endptr, 8);
688
689 /* If not an octal number, maybe true/false? */
690 if (*endptr != 0)
691 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
692
693 /*
694 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 695 * a chmod value to restrict to.
06cbe855
HO
696 */
697 switch (i) {
698 case PERM_UMASK: /* 0 */
699 return PERM_UMASK;
700 case OLD_PERM_GROUP: /* 1 */
701 return PERM_GROUP;
702 case OLD_PERM_EVERYBODY: /* 2 */
703 return PERM_EVERYBODY;
94df2506 704 }
06cbe855
HO
705
706 /* A filemode value was given: 0xxx */
707
708 if ((i & 0600) != 0600)
709 die("Problem with core.sharedRepository filemode value "
710 "(0%.3o).\nThe owner of files must always have "
711 "read and write permissions.", i);
712
713 /*
714 * Mask filemode value. Others can not get write permission.
715 * x flags for directories are handled separately.
716 */
5a688fe4 717 return -(i & 0666);
94df2506
JH
718}
719
ef90d6d4 720int check_repository_format_version(const char *var, const char *value, void *cb)
ab9cb76f 721{
299726d5
JS
722 if (strcmp(var, "core.repositoryformatversion") == 0)
723 repository_format_version = git_config_int(var, value);
457f06d6 724 else if (strcmp(var, "core.sharedrepository") == 0)
94df2506 725 shared_repository = git_config_perm(var, value);
e90fdc39
JS
726 else if (strcmp(var, "core.bare") == 0) {
727 is_bare_repository_cfg = git_config_bool(var, value);
728 if (is_bare_repository_cfg == 1)
729 inside_work_tree = -1;
730 } else if (strcmp(var, "core.worktree") == 0) {
180483c5
JH
731 if (!value)
732 return config_error_nonbool(var);
8e0f7003 733 free(git_work_tree_cfg);
e90fdc39
JS
734 git_work_tree_cfg = xstrdup(value);
735 inside_work_tree = -1;
736 }
299726d5 737 return 0;
ab9cb76f
JH
738}
739
740int check_repository_format(void)
741{
337e51ce 742 return check_repository_format_gently(get_git_dir(), NULL);
ab9cb76f
JH
743}
744
e1e5ec86
CB
745/*
746 * Returns the "prefix", a path to the current working directory
747 * relative to the work tree root, or NULL, if the current working
748 * directory is not a strict subdirectory of the work tree root. The
749 * prefix always ends with a '/' character.
750 */
5e7bfe25
JH
751const char *setup_git_directory(void)
752{
b3f66fd3 753 return setup_git_directory_gently(NULL);
5e7bfe25 754}
abc06822
FG
755
756const char *resolve_gitdir(const char *suspect)
757{
758 if (is_git_directory(suspect))
759 return suspect;
efc5fb6a 760 return read_gitfile(suspect);
abc06822 761}