setup_git_directory_gently_1(): resolve symlinks in ceiling paths
[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
69 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
70 if (!lstat(name, &st))
71 return 1; /* file exists */
72 if (errno == ENOENT || errno == ENOTDIR)
73 return 0; /* file does not exist */
74 die_errno("failed to stat '%s'", arg);
75}
76
023e37c3
MM
77static void NORETURN die_verify_filename(const char *prefix,
78 const char *arg,
79 int diagnose_misspelt_rev)
009fee47 80{
023e37c3
MM
81 if (!diagnose_misspelt_rev)
82 die("%s: no such path in the working tree.\n"
4d4b5739 83 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
023e37c3 84 arg);
0e539dca
JH
85 /*
86 * Saying "'(icase)foo' does not exist in the index" when the
87 * user gave us ":(icase)foo" is just stupid. A magic pathspec
88 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 89 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
90 */
91 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 92 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 93
009fee47
MM
94 /* ... or fall back the most general message. */
95 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
4d4b5739
MM
96 "Use '--' to separate paths from revisions, like this:\n"
97 "'git <command> [<revision>...] -- [<file>...]'", arg);
009fee47
MM
98
99}
100
e23d0b4a
LT
101/*
102 * Verify a filename that we got as an argument for a pathspec
103 * entry. Note that a filename that begins with "-" never verifies
104 * as true, because even if such a filename were to exist, we want
105 * it to be preceded by the "--" marker (or we want the user to
106 * use a format like "./-filename")
023e37c3
MM
107 *
108 * The "diagnose_misspelt_rev" is used to provide a user-friendly
109 * diagnosis when dying upon finding that "name" is not a pathname.
110 * If set to 1, the diagnosis will try to diagnose "name" as an
111 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
112 * will only complain about an inexisting file.
113 *
114 * This function is typically called to check that a "file or rev"
115 * argument is unambiguous. In this case, the caller will want
116 * diagnose_misspelt_rev == 1 when verifying the first non-rev
117 * argument (which could have been a revision), and
118 * diagnose_misspelt_rev == 0 for the next ones (because we already
119 * saw a filename, there's not ambiguity anymore).
e23d0b4a 120 */
023e37c3
MM
121void verify_filename(const char *prefix,
122 const char *arg,
123 int diagnose_misspelt_rev)
e23d0b4a 124{
e23d0b4a
LT
125 if (*arg == '-')
126 die("bad flag '%s' used after filename", arg);
c6e8c800 127 if (check_filename(prefix, arg))
e23d0b4a 128 return;
023e37c3 129 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
130}
131
ea92f41f
JH
132/*
133 * Opposite of the above: the command line did not have -- marker
134 * and we parsed the arg as a refname. It should not be interpretable
135 * as a filename.
136 */
137void verify_non_filename(const char *prefix, const char *arg)
138{
7ae3df8c 139 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 140 return;
ea92f41f
JH
141 if (*arg == '-')
142 return; /* flag */
c6e8c800
JH
143 if (!check_filename(prefix, arg))
144 return;
145 die("ambiguous argument '%s': both revision and filename\n"
4d4b5739
MM
146 "Use '--' to separate paths from revisions, like this:\n"
147 "'git <command> [<revision>...] -- [<file>...]'", arg);
ea92f41f
JH
148}
149
8a42c985
JH
150/*
151 * Magic pathspec
152 *
153 * NEEDSWORK: These need to be moved to dir.h or even to a new
154 * pathspec.h when we restructure get_pathspec() users to use the
155 * "struct pathspec" interface.
156 *
157 * Possible future magic semantics include stuff like:
158 *
159 * { PATHSPEC_NOGLOB, '!', "noglob" },
6d942927 160 * { PATHSPEC_ICASE, '\0', "icase" },
8a42c985
JH
161 * { PATHSPEC_RECURSIVE, '*', "recursive" },
162 * { PATHSPEC_REGEXP, '\0', "regexp" },
163 *
164 */
165#define PATHSPEC_FROMTOP (1<<0)
166
488201c8 167static struct pathspec_magic {
8a42c985
JH
168 unsigned bit;
169 char mnemonic; /* this cannot be ':'! */
170 const char *name;
171} pathspec_magic[] = {
172 { PATHSPEC_FROMTOP, '/', "top" },
173};
174
175/*
176 * Take an element of a pathspec and check for magic signatures.
177 * Append the result to the prefix.
178 *
179 * For now, we only parse the syntax and throw out anything other than
180 * "top" magic.
181 *
182 * NEEDSWORK: This needs to be rewritten when we start migrating
183 * get_pathspec() users to use the "struct pathspec" interface. For
184 * example, a pathspec element may be marked as case-insensitive, but
185 * the prefix part must always match literally, and a single stupid
186 * string cannot express such a case.
187 */
488201c8 188static const char *prefix_pathspec(const char *prefix, int prefixlen, const char *elt)
8a42c985
JH
189{
190 unsigned magic = 0;
191 const char *copyfrom = elt;
6d942927 192 int i;
8a42c985
JH
193
194 if (elt[0] != ':') {
195 ; /* nothing to do */
196 } else if (elt[1] == '(') {
197 /* longhand */
198 const char *nextat;
199 for (copyfrom = elt + 2;
200 *copyfrom && *copyfrom != ')';
201 copyfrom = nextat) {
202 size_t len = strcspn(copyfrom, ",)");
203 if (copyfrom[len] == ')')
204 nextat = copyfrom + len;
205 else
206 nextat = copyfrom + len + 1;
207 if (!len)
208 continue;
209 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
210 if (strlen(pathspec_magic[i].name) == len &&
211 !strncmp(pathspec_magic[i].name, copyfrom, len)) {
212 magic |= pathspec_magic[i].bit;
213 break;
214 }
215 if (ARRAY_SIZE(pathspec_magic) <= i)
216 die("Invalid pathspec magic '%.*s' in '%s'",
217 (int) len, copyfrom, elt);
218 }
219 if (*copyfrom == ')')
220 copyfrom++;
221 } else {
222 /* shorthand */
223 for (copyfrom = elt + 1;
224 *copyfrom && *copyfrom != ':';
225 copyfrom++) {
226 char ch = *copyfrom;
2f6c9760
JH
227
228 if (!is_pathspec_magic(ch))
229 break;
8a42c985
JH
230 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
231 if (pathspec_magic[i].mnemonic == ch) {
232 magic |= pathspec_magic[i].bit;
233 break;
234 }
235 if (ARRAY_SIZE(pathspec_magic) <= i)
2f6c9760
JH
236 die("Unimplemented pathspec magic '%c' in '%s'",
237 ch, elt);
8a42c985
JH
238 }
239 if (*copyfrom == ':')
240 copyfrom++;
241 }
242
243 if (magic & PATHSPEC_FROMTOP)
6d942927 244 return xstrdup(copyfrom);
8a42c985 245 else
6d942927 246 return prefix_path(prefix, prefixlen, copyfrom);
8a42c985
JH
247}
248
6b5ee137 249const char **get_pathspec(const char *prefix, const char **pathspec)
d288a700 250{
6b5ee137 251 const char *entry = *pathspec;
d089ebaa 252 const char **src, **dst;
d288a700
LT
253 int prefixlen;
254
f332726e
LT
255 if (!prefix && !entry)
256 return NULL;
d288a700
LT
257
258 if (!entry) {
259 static const char *spec[2];
260 spec[0] = prefix;
261 spec[1] = NULL;
262 return spec;
263 }
264
265 /* Otherwise we have to re-write the entries.. */
d089ebaa
JH
266 src = pathspec;
267 dst = pathspec;
f332726e 268 prefixlen = prefix ? strlen(prefix) : 0;
d089ebaa 269 while (*src) {
8a42c985 270 *(dst++) = prefix_pathspec(prefix, prefixlen, *src);
d089ebaa
JH
271 src++;
272 }
273 *dst = NULL;
274 if (!*pathspec)
275 return NULL;
276 return pathspec;
d288a700
LT
277}
278
5f5608bc 279/*
ad1a382f 280 * Test if it looks like we're at a git directory.
5e7bfe25 281 * We want to see:
5f5608bc 282 *
790296fd 283 * - either an objects/ directory _or_ the proper
5f5608bc 284 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 285 * - a refs/ directory
8098a178 286 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
287 * a proper "ref:", or a regular file HEAD that has a properly
288 * formatted sha1 object name.
5f5608bc 289 */
b3256eb8 290int is_git_directory(const char *suspect)
5f5608bc 291{
ad1a382f
SP
292 char path[PATH_MAX];
293 size_t len = strlen(suspect);
294
3c9d0414
GB
295 if (PATH_MAX <= len + strlen("/objects"))
296 die("Too long path: %.*s", 60, suspect);
ad1a382f
SP
297 strcpy(path, suspect);
298 if (getenv(DB_ENVIRONMENT)) {
299 if (access(getenv(DB_ENVIRONMENT), X_OK))
300 return 0;
301 }
302 else {
303 strcpy(path + len, "/objects");
304 if (access(path, X_OK))
305 return 0;
306 }
307
308 strcpy(path + len, "/refs");
309 if (access(path, X_OK))
8098a178 310 return 0;
ad1a382f
SP
311
312 strcpy(path + len, "/HEAD");
c847f537 313 if (validate_headref(path))
ad1a382f
SP
314 return 0;
315
8098a178 316 return 1;
5f5608bc
LT
317}
318
68025633
JS
319int is_inside_git_dir(void)
320{
e90fdc39
JS
321 if (inside_git_dir < 0)
322 inside_git_dir = is_inside_dir(get_git_dir());
323 return inside_git_dir;
892c41b9
ML
324}
325
892c41b9
ML
326int is_inside_work_tree(void)
327{
e90fdc39
JS
328 if (inside_work_tree < 0)
329 inside_work_tree = is_inside_dir(get_git_work_tree());
330 return inside_work_tree;
892c41b9
ML
331}
332
f3fa1838
JH
333void setup_work_tree(void)
334{
354e6534
JS
335 const char *work_tree, *git_dir;
336 static int initialized = 0;
337
338 if (initialized)
339 return;
340 work_tree = get_git_work_tree();
341 git_dir = get_git_dir();
59f0f2f3 342 if (!is_absolute_path(git_dir))
e2a57aac 343 git_dir = real_path(get_git_dir());
59f0f2f3
MH
344 if (!work_tree || chdir(work_tree))
345 die("This operation must be run in a work tree");
0ed74813
NTND
346
347 /*
348 * Make sure subsequent git processes find correct worktree
349 * if $GIT_WORK_TREE is set relative
350 */
351 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
352 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
353
e2a57aac 354 set_git_dir(relative_path(git_dir, work_tree));
354e6534 355 initialized = 1;
59f0f2f3
MH
356}
357
337e51ce 358static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 359{
337e51ce
NTND
360 char repo_config[PATH_MAX+1];
361
362 /*
363 * git_config() can't be used here because it calls git_pathdup()
364 * to get $GIT_CONFIG/config. That call will make setup_git_env()
365 * set git_dir to ".git".
366 *
367 * We are in gitdir setup, no git dir has been found useable yet.
368 * Use a gentler version of git_config() to check if this repo
369 * is a good one.
370 */
371 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
372 git_config_early(check_repository_format_version, NULL, repo_config);
9459aa77
NTND
373 if (GIT_REPO_VERSION < repository_format_version) {
374 if (!nongit_ok)
375 die ("Expected git repo version <= %d, found %d",
376 GIT_REPO_VERSION, repository_format_version);
377 warning("Expected git repo version <= %d, found %d",
378 GIT_REPO_VERSION, repository_format_version);
379 warning("Please upgrade Git");
380 *nongit_ok = -1;
381 return -1;
382 }
383 return 0;
384}
385
b44ebb19
LH
386/*
387 * Try to read the location of the git directory from the .git file,
388 * return path to git directory if found.
389 */
13d6ec91 390const char *read_gitfile(const char *path)
b44ebb19
LH
391{
392 char *buf;
40c813e0
BK
393 char *dir;
394 const char *slash;
b44ebb19
LH
395 struct stat st;
396 int fd;
b1905aea 397 ssize_t len;
b44ebb19
LH
398
399 if (stat(path, &st))
400 return NULL;
401 if (!S_ISREG(st.st_mode))
402 return NULL;
403 fd = open(path, O_RDONLY);
404 if (fd < 0)
d824cbba 405 die_errno("Error opening '%s'", path);
b44ebb19
LH
406 buf = xmalloc(st.st_size + 1);
407 len = read_in_full(fd, buf, st.st_size);
408 close(fd);
409 if (len != st.st_size)
410 die("Error reading %s", path);
411 buf[len] = '\0';
412 if (prefixcmp(buf, "gitdir: "))
413 die("Invalid gitfile format: %s", path);
414 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
415 len--;
416 if (len < 9)
417 die("No path in gitfile: %s", path);
418 buf[len] = '\0';
40c813e0
BK
419 dir = buf + 8;
420
421 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
422 size_t pathlen = slash+1 - path;
423 size_t dirlen = pathlen + len - 8;
424 dir = xmalloc(dirlen + 1);
425 strncpy(dir, path, pathlen);
426 strncpy(dir + pathlen, buf + 8, len - 8);
427 dir[dirlen] = '\0';
428 free(buf);
429 buf = dir;
430 }
431
432 if (!is_git_directory(dir))
433 die("Not a git repository: %s", dir);
e2a57aac 434 path = real_path(dir);
40c813e0 435
b44ebb19
LH
436 free(buf);
437 return path;
438}
439
e4e30347 440static const char *setup_explicit_git_dir(const char *gitdirenv,
b3f66fd3
NTND
441 char *cwd, int len,
442 int *nongit_ok)
e4e30347 443{
b3f66fd3
NTND
444 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
445 const char *worktree;
446 char *gitfile;
9b125da4 447 int offset;
e4e30347
JN
448
449 if (PATH_MAX - 40 < strlen(gitdirenv))
450 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 451
13d6ec91 452 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
453 if (gitfile) {
454 gitfile = xstrdup(gitfile);
455 gitdirenv = gitfile;
456 }
457
e4e30347
JN
458 if (!is_git_directory(gitdirenv)) {
459 if (nongit_ok) {
460 *nongit_ok = 1;
b3f66fd3 461 free(gitfile);
e4e30347
JN
462 return NULL;
463 }
464 die("Not a git repository: '%s'", gitdirenv);
465 }
b3f66fd3
NTND
466
467 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
468 free(gitfile);
469 return NULL;
e4e30347 470 }
b3f66fd3
NTND
471
472 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
473 if (work_tree_env)
474 set_git_work_tree(work_tree_env);
475 else if (is_bare_repository_cfg > 0) {
476 if (git_work_tree_cfg) /* #22.2, #30 */
477 die("core.bare and core.worktree do not make sense");
478
479 /* #18, #26 */
480 set_git_dir(gitdirenv);
481 free(gitfile);
e4e30347 482 return NULL;
b3f66fd3
NTND
483 }
484 else if (git_work_tree_cfg) { /* #6, #14 */
485 if (is_absolute_path(git_work_tree_cfg))
486 set_git_work_tree(git_work_tree_cfg);
487 else {
488 char core_worktree[PATH_MAX];
489 if (chdir(gitdirenv))
490 die_errno("Could not chdir to '%s'", gitdirenv);
491 if (chdir(git_work_tree_cfg))
492 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
493 if (!getcwd(core_worktree, PATH_MAX))
494 die_errno("Could not get directory '%s'", git_work_tree_cfg);
495 if (chdir(cwd))
496 die_errno("Could not come back to cwd");
497 set_git_work_tree(core_worktree);
498 }
499 }
500 else /* #2, #10 */
501 set_git_work_tree(".");
502
503 /* set_git_work_tree() must have been called by now */
504 worktree = get_git_work_tree();
505
506 /* both get_git_work_tree() and cwd are already normalized */
507 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
508 set_git_dir(gitdirenv);
509 free(gitfile);
e4e30347 510 return NULL;
b3f66fd3 511 }
e4e30347 512
9b125da4
NTND
513 offset = dir_inside_of(cwd, worktree);
514 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 515 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
516 if (chdir(worktree))
517 die_errno("Could not chdir to '%s'", worktree);
518 cwd[len++] = '/';
519 cwd[len] = '\0';
520 free(gitfile);
9b125da4 521 return cwd + offset;
93a00542 522 }
b3f66fd3
NTND
523
524 /* cwd outside worktree */
525 set_git_dir(gitdirenv);
526 free(gitfile);
527 return NULL;
93a00542
JN
528}
529
9951d3b3
NTND
530static const char *setup_discovered_git_dir(const char *gitdir,
531 char *cwd, int offset, int len,
532 int *nongit_ok)
98937bef 533{
9951d3b3
NTND
534 if (check_repository_format_gently(gitdir, nongit_ok))
535 return NULL;
98937bef 536
4868b2ea
JN
537 /* --work-tree is set without --git-dir; use discovered one */
538 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
539 if (offset != len && !is_absolute_path(gitdir))
e2a57aac 540 gitdir = xstrdup(real_path(gitdir));
4868b2ea
JN
541 if (chdir(cwd))
542 die_errno("Could not come back to cwd");
543 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
544 }
545
9951d3b3
NTND
546 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
547 if (is_bare_repository_cfg > 0) {
e2a57aac 548 set_git_dir(offset == len ? gitdir : real_path(gitdir));
9951d3b3
NTND
549 if (chdir(cwd))
550 die_errno("Could not come back to cwd");
98937bef 551 return NULL;
9951d3b3 552 }
98937bef 553
9951d3b3
NTND
554 /* #0, #1, #5, #8, #9, #12, #13 */
555 set_git_work_tree(".");
556 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
557 set_git_dir(gitdir);
98937bef 558 inside_git_dir = 0;
9951d3b3 559 inside_work_tree = 1;
98937bef
NTND
560 if (offset == len)
561 return NULL;
562
563 /* Make "offset" point to past the '/', and add a '/' at the end */
564 offset++;
565 cwd[len++] = '/';
566 cwd[len] = 0;
567 return cwd + offset;
568}
569
1cd8031b
NTND
570/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
571static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
68698da5
JN
572{
573 int root_len;
574
1cd8031b
NTND
575 if (check_repository_format_gently(".", nongit_ok))
576 return NULL;
577
4868b2ea
JN
578 /* --work-tree is set without --git-dir; use discovered one */
579 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
580 const char *gitdir;
581
582 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
583 if (chdir(cwd))
584 die_errno("Could not come back to cwd");
585 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
586 }
587
68698da5 588 inside_git_dir = 1;
1cd8031b 589 inside_work_tree = 0;
68698da5 590 if (offset != len) {
8fc0ae80
NTND
591 if (chdir(cwd))
592 die_errno("Cannot come back to cwd");
68698da5
JN
593 root_len = offset_1st_component(cwd);
594 cwd[offset > root_len ? offset : root_len] = '\0';
595 set_git_dir(cwd);
337e51ce 596 }
1cd8031b 597 else
68698da5 598 set_git_dir(".");
68698da5
JN
599 return NULL;
600}
601
f161edeb
JN
602static const char *setup_nongit(const char *cwd, int *nongit_ok)
603{
604 if (!nongit_ok)
605 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
606 if (chdir(cwd))
607 die_errno("Cannot come back to cwd");
608 *nongit_ok = 1;
609 return NULL;
610}
611
2565b43b 612static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
613{
614 struct stat buf;
2565b43b
CB
615 if (stat(path, &buf)) {
616 die_errno("failed to stat '%*s%s%s'",
617 prefix_len,
60c98d1e
JN
618 prefix ? prefix : "",
619 prefix ? "/" : "", path);
2565b43b 620 }
60c98d1e
JN
621 return buf.st_dev;
622}
623
9e2326c7 624/*
1b77d83c
MH
625 * A "string_list_each_func_t" function that canonicalizes an entry
626 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
627 * discards it if unusable.
9e2326c7 628 */
1b77d83c
MH
629static int canonicalize_ceiling_entry(struct string_list_item *item,
630 void *unused)
9e2326c7 631{
1b77d83c
MH
632 char *ceil = item->string;
633 const char *real_path;
9e2326c7 634
1b77d83c 635 if (!*ceil || !is_absolute_path(ceil))
9e2326c7 636 return 0;
1b77d83c
MH
637 real_path = real_path_if_valid(ceil);
638 if (!real_path)
9e2326c7 639 return 0;
9e2326c7 640 free(item->string);
1b77d83c 641 item->string = xstrdup(real_path);
9e2326c7
MH
642 return 1;
643}
644
e90fdc39
JS
645/*
646 * We cannot decide in this function whether we are in the work tree or
647 * not, since the config can only be read _after_ this function was called.
648 */
a60645f9 649static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 650{
0454dd93 651 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 652 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
d288a700 653 static char cwd[PATH_MAX+1];
9951d3b3
NTND
654 const char *gitdirenv, *ret;
655 char *gitfile;
31171d9e 656 int len, offset, offset_parent, ceil_offset = -1;
c7d1d1b1
RH
657 dev_t current_device = 0;
658 int one_filesystem = 1;
d288a700 659
af05d679
SG
660 /*
661 * Let's assume that we are in a git repository.
662 * If it turns out later that we are somewhere else, the value will be
663 * updated accordingly.
664 */
665 if (nongit_ok)
666 *nongit_ok = 0;
667
b3f66fd3
NTND
668 if (!getcwd(cwd, sizeof(cwd)-1))
669 die_errno("Unable to read current working directory");
670 offset = len = strlen(cwd);
671
e90fdc39
JS
672 /*
673 * If GIT_DIR is set explicitly, we're not going
674 * to do any discovery, but we still do repository
675 * validation.
676 */
ad1a382f 677 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e4e30347 678 if (gitdirenv)
b3f66fd3 679 return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
d288a700 680
31171d9e
MH
681 if (env_ceiling_dirs) {
682 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c
MH
683 filter_string_list(&ceiling_dirs, 0,
684 canonicalize_ceiling_entry, NULL);
31171d9e
MH
685 ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs);
686 string_list_clear(&ceiling_dirs, 0);
687 }
688
17d778e7
JH
689 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
690 ceil_offset = 1;
d288a700 691
892c41b9 692 /*
e90fdc39 693 * Test in the following order (relative to the cwd):
b44ebb19 694 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
695 * - .git/
696 * - ./ (bare)
b44ebb19 697 * - ../.git
e90fdc39
JS
698 * - ../.git/
699 * - ../ (bare)
700 * - ../../.git/
701 * etc.
892c41b9 702 */
cf87463e 703 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 704 if (one_filesystem)
2565b43b 705 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 706 for (;;) {
13d6ec91 707 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
708 if (gitfile)
709 gitdirenv = gitfile = xstrdup(gitfile);
710 else {
711 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
712 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
713 }
714
715 if (gitdirenv) {
716 ret = setup_discovered_git_dir(gitdirenv,
717 cwd, offset, len,
718 nongit_ok);
719 free(gitfile);
720 return ret;
721 }
722 free(gitfile);
723
68698da5 724 if (is_git_directory("."))
1cd8031b
NTND
725 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
726
2565b43b
CB
727 offset_parent = offset;
728 while (--offset_parent > ceil_offset && cwd[offset_parent] != '/');
729 if (offset_parent <= ceil_offset)
f161edeb 730 return setup_nongit(cwd, nongit_ok);
8030e442 731 if (one_filesystem) {
2565b43b 732 dev_t parent_device = get_device_or_die("..", cwd, offset);
60c98d1e 733 if (parent_device != current_device) {
8030e442
LD
734 if (nongit_ok) {
735 if (chdir(cwd))
736 die_errno("Cannot come back to cwd");
737 *nongit_ok = 1;
738 return NULL;
739 }
740 cwd[offset] = '\0';
2565b43b 741 die("Not a git repository (or any parent up to mount point %s)\n"
cf87463e 742 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
8030e442
LD
743 }
744 }
502ffe34
LD
745 if (chdir("..")) {
746 cwd[offset] = '\0';
d824cbba 747 die_errno("Cannot change to '%s/..'", cwd);
502ffe34 748 }
2565b43b 749 offset = offset_parent;
892c41b9 750 }
d288a700 751}
5e7bfe25 752
a60645f9
NTND
753const char *setup_git_directory_gently(int *nongit_ok)
754{
755 const char *prefix;
756
757 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f
DA
758 if (prefix)
759 setenv("GIT_PREFIX", prefix, 1);
760 else
761 setenv("GIT_PREFIX", "", 1);
762
f07d6a1a 763 if (startup_info) {
a60645f9 764 startup_info->have_repository = !nongit_ok || !*nongit_ok;
f07d6a1a
NTND
765 startup_info->prefix = prefix;
766 }
a60645f9
NTND
767 return prefix;
768}
769
94df2506
JH
770int git_config_perm(const char *var, const char *value)
771{
06cbe855
HO
772 int i;
773 char *endptr;
774
775 if (value == NULL)
776 return PERM_GROUP;
777
778 if (!strcmp(value, "umask"))
779 return PERM_UMASK;
780 if (!strcmp(value, "group"))
781 return PERM_GROUP;
782 if (!strcmp(value, "all") ||
783 !strcmp(value, "world") ||
784 !strcmp(value, "everybody"))
785 return PERM_EVERYBODY;
786
787 /* Parse octal numbers */
788 i = strtol(value, &endptr, 8);
789
790 /* If not an octal number, maybe true/false? */
791 if (*endptr != 0)
792 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
793
794 /*
795 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 796 * a chmod value to restrict to.
06cbe855
HO
797 */
798 switch (i) {
799 case PERM_UMASK: /* 0 */
800 return PERM_UMASK;
801 case OLD_PERM_GROUP: /* 1 */
802 return PERM_GROUP;
803 case OLD_PERM_EVERYBODY: /* 2 */
804 return PERM_EVERYBODY;
94df2506 805 }
06cbe855
HO
806
807 /* A filemode value was given: 0xxx */
808
809 if ((i & 0600) != 0600)
810 die("Problem with core.sharedRepository filemode value "
811 "(0%.3o).\nThe owner of files must always have "
812 "read and write permissions.", i);
813
814 /*
815 * Mask filemode value. Others can not get write permission.
816 * x flags for directories are handled separately.
817 */
5a688fe4 818 return -(i & 0666);
94df2506
JH
819}
820
ef90d6d4 821int check_repository_format_version(const char *var, const char *value, void *cb)
ab9cb76f 822{
299726d5
JS
823 if (strcmp(var, "core.repositoryformatversion") == 0)
824 repository_format_version = git_config_int(var, value);
457f06d6 825 else if (strcmp(var, "core.sharedrepository") == 0)
94df2506 826 shared_repository = git_config_perm(var, value);
e90fdc39
JS
827 else if (strcmp(var, "core.bare") == 0) {
828 is_bare_repository_cfg = git_config_bool(var, value);
829 if (is_bare_repository_cfg == 1)
830 inside_work_tree = -1;
831 } else if (strcmp(var, "core.worktree") == 0) {
180483c5
JH
832 if (!value)
833 return config_error_nonbool(var);
8e0f7003 834 free(git_work_tree_cfg);
e90fdc39
JS
835 git_work_tree_cfg = xstrdup(value);
836 inside_work_tree = -1;
837 }
299726d5 838 return 0;
ab9cb76f
JH
839}
840
841int check_repository_format(void)
842{
337e51ce 843 return check_repository_format_gently(get_git_dir(), NULL);
ab9cb76f
JH
844}
845
e1e5ec86
CB
846/*
847 * Returns the "prefix", a path to the current working directory
848 * relative to the work tree root, or NULL, if the current working
849 * directory is not a strict subdirectory of the work tree root. The
850 * prefix always ends with a '/' character.
851 */
5e7bfe25
JH
852const char *setup_git_directory(void)
853{
b3f66fd3 854 return setup_git_directory_gently(NULL);
5e7bfe25 855}
abc06822
FG
856
857const char *resolve_gitdir(const char *suspect)
858{
859 if (is_git_directory(suspect))
860 return suspect;
efc5fb6a 861 return read_gitfile(suspect);
abc06822 862}