setup: add abspath_part_inside_repo() function
[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
ddc2a628
MEW
8/*
9 * The input parameter must contain an absolute path, and it must already be
10 * normalized.
11 *
12 * Find the part of an absolute path that lies inside the work tree by
13 * dereferencing symlinks outside the work tree, for example:
14 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
15 * /dir/file (work tree is /) -> dir/file
16 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
17 * /dir/repolink/file (repolink points to /dir/repo) -> file
18 * /dir/repo (exactly equal to work tree) -> (empty string)
19 */
20static int abspath_part_inside_repo(char *path)
21{
22 size_t len;
23 size_t wtlen;
24 char *path0;
25 int off;
26 const char *work_tree = get_git_work_tree();
27
28 if (!work_tree)
29 return -1;
30 wtlen = strlen(work_tree);
31 len = strlen(path);
32 off = 0;
33
34 /* check if work tree is already the prefix */
35 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
36 if (path[wtlen] == '/') {
37 memmove(path, path + wtlen + 1, len - wtlen);
38 return 0;
39 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
40 /* work tree is the root, or the whole path */
41 memmove(path, path + wtlen, len - wtlen + 1);
42 return 0;
43 }
44 /* work tree might match beginning of a symlink to work tree */
45 off = wtlen;
46 }
47 path0 = path;
48 path += offset_1st_component(path) + off;
49
50 /* check each '/'-terminated level */
51 while (*path) {
52 path++;
53 if (*path == '/') {
54 *path = '\0';
55 if (strcmp(real_path(path0), work_tree) == 0) {
56 memmove(path0, path + 1, len - (path - path0));
57 return 0;
58 }
59 *path = '/';
60 }
61 }
62
63 /* check whole path */
64 if (strcmp(real_path(path0), work_tree) == 0) {
65 *path0 = '\0';
66 return 0;
67 }
68
69 return -1;
70}
71
645a29c4
NTND
72/*
73 * Normalize "path", prepending the "prefix" for relative paths. If
74 * remaining_prefix is not NULL, return the actual prefix still
75 * remains in the path. For example, prefix = sub1/sub2/ and path is
76 *
77 * foo -> sub1/sub2/foo (full prefix)
78 * ../foo -> sub1/foo (remaining prefix is sub1/)
79 * ../../bar -> bar (no remaining prefix)
80 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
81 * `pwd`/../bar -> sub1/bar (no remaining prefix)
82 */
83char *prefix_path_gently(const char *prefix, int len,
84 int *remaining_prefix, const char *path)
d089ebaa
JH
85{
86 const char *orig = path;
18e051a3
CMAB
87 char *sanitized;
88 if (is_absolute_path(orig)) {
e2a57aac 89 const char *temp = real_path(path);
18e051a3
CMAB
90 sanitized = xmalloc(len + strlen(temp) + 1);
91 strcpy(sanitized, temp);
645a29c4
NTND
92 if (remaining_prefix)
93 *remaining_prefix = 0;
18e051a3
CMAB
94 } else {
95 sanitized = xmalloc(len + strlen(path) + 1);
d089ebaa
JH
96 if (len)
97 memcpy(sanitized, prefix, len);
98 strcpy(sanitized + len, path);
645a29c4
NTND
99 if (remaining_prefix)
100 *remaining_prefix = len;
f332726e 101 }
645a29c4 102 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix))
d089ebaa 103 goto error_out;
9a13ba1b 104 if (is_absolute_path(orig)) {
72ec8ba6 105 size_t root_len, len, total;
d089ebaa 106 const char *work_tree = get_git_work_tree();
b3100fd5
JH
107 if (!work_tree)
108 goto error_out;
109 len = strlen(work_tree);
72ec8ba6 110 root_len = offset_1st_component(work_tree);
b3100fd5 111 total = strlen(sanitized) + 1;
d089ebaa 112 if (strncmp(sanitized, work_tree, len) ||
72ec8ba6 113 (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
d089ebaa 114 error_out:
546e0fd9
JK
115 free(sanitized);
116 return NULL;
d089ebaa
JH
117 }
118 if (sanitized[len] == '/')
119 len++;
120 memmove(sanitized, sanitized + len, total - len);
121 }
122 return sanitized;
f332726e
LT
123}
124
546e0fd9
JK
125char *prefix_path(const char *prefix, int len, const char *path)
126{
645a29c4 127 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
128 if (!r)
129 die("'%s' is outside repository", path);
130 return r;
131}
132
133int path_inside_repo(const char *prefix, const char *path)
134{
135 int len = prefix ? strlen(prefix) : 0;
645a29c4 136 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
137 if (r) {
138 free(r);
139 return 1;
140 }
141 return 0;
142}
143
c6e8c800
JH
144int check_filename(const char *prefix, const char *arg)
145{
146 const char *name;
147 struct stat st;
148
4db86e8b
NTND
149 if (!prefixcmp(arg, ":/")) {
150 if (arg[2] == '\0') /* ":/" is root dir, always exists */
151 return 1;
152 name = arg + 2;
153 } else if (prefix)
154 name = prefix_filename(prefix, strlen(prefix), arg);
155 else
156 name = arg;
c6e8c800
JH
157 if (!lstat(name, &st))
158 return 1; /* file exists */
159 if (errno == ENOENT || errno == ENOTDIR)
160 return 0; /* file does not exist */
161 die_errno("failed to stat '%s'", arg);
162}
163
023e37c3
MM
164static void NORETURN die_verify_filename(const char *prefix,
165 const char *arg,
166 int diagnose_misspelt_rev)
009fee47 167{
023e37c3
MM
168 if (!diagnose_misspelt_rev)
169 die("%s: no such path in the working tree.\n"
4d4b5739 170 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
023e37c3 171 arg);
0e539dca
JH
172 /*
173 * Saying "'(icase)foo' does not exist in the index" when the
174 * user gave us ":(icase)foo" is just stupid. A magic pathspec
175 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 176 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
177 */
178 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 179 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 180
009fee47
MM
181 /* ... or fall back the most general message. */
182 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
4d4b5739
MM
183 "Use '--' to separate paths from revisions, like this:\n"
184 "'git <command> [<revision>...] -- [<file>...]'", arg);
009fee47
MM
185
186}
187
e23d0b4a
LT
188/*
189 * Verify a filename that we got as an argument for a pathspec
190 * entry. Note that a filename that begins with "-" never verifies
191 * as true, because even if such a filename were to exist, we want
192 * it to be preceded by the "--" marker (or we want the user to
193 * use a format like "./-filename")
023e37c3
MM
194 *
195 * The "diagnose_misspelt_rev" is used to provide a user-friendly
196 * diagnosis when dying upon finding that "name" is not a pathname.
197 * If set to 1, the diagnosis will try to diagnose "name" as an
198 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
199 * will only complain about an inexisting file.
200 *
201 * This function is typically called to check that a "file or rev"
202 * argument is unambiguous. In this case, the caller will want
203 * diagnose_misspelt_rev == 1 when verifying the first non-rev
204 * argument (which could have been a revision), and
205 * diagnose_misspelt_rev == 0 for the next ones (because we already
206 * saw a filename, there's not ambiguity anymore).
e23d0b4a 207 */
023e37c3
MM
208void verify_filename(const char *prefix,
209 const char *arg,
210 int diagnose_misspelt_rev)
e23d0b4a 211{
e23d0b4a
LT
212 if (*arg == '-')
213 die("bad flag '%s' used after filename", arg);
c6e8c800 214 if (check_filename(prefix, arg))
e23d0b4a 215 return;
023e37c3 216 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
217}
218
ea92f41f
JH
219/*
220 * Opposite of the above: the command line did not have -- marker
221 * and we parsed the arg as a refname. It should not be interpretable
222 * as a filename.
223 */
224void verify_non_filename(const char *prefix, const char *arg)
225{
7ae3df8c 226 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 227 return;
ea92f41f
JH
228 if (*arg == '-')
229 return; /* flag */
c6e8c800
JH
230 if (!check_filename(prefix, arg))
231 return;
232 die("ambiguous argument '%s': both revision and filename\n"
4d4b5739
MM
233 "Use '--' to separate paths from revisions, like this:\n"
234 "'git <command> [<revision>...] -- [<file>...]'", arg);
ea92f41f
JH
235}
236
d288a700 237
5f5608bc 238/*
ad1a382f 239 * Test if it looks like we're at a git directory.
5e7bfe25 240 * We want to see:
5f5608bc 241 *
790296fd 242 * - either an objects/ directory _or_ the proper
5f5608bc 243 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 244 * - a refs/ directory
8098a178 245 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
246 * a proper "ref:", or a regular file HEAD that has a properly
247 * formatted sha1 object name.
5f5608bc 248 */
b3256eb8 249int is_git_directory(const char *suspect)
5f5608bc 250{
ad1a382f
SP
251 char path[PATH_MAX];
252 size_t len = strlen(suspect);
253
3c9d0414
GB
254 if (PATH_MAX <= len + strlen("/objects"))
255 die("Too long path: %.*s", 60, suspect);
ad1a382f
SP
256 strcpy(path, suspect);
257 if (getenv(DB_ENVIRONMENT)) {
258 if (access(getenv(DB_ENVIRONMENT), X_OK))
259 return 0;
260 }
261 else {
262 strcpy(path + len, "/objects");
263 if (access(path, X_OK))
264 return 0;
265 }
266
267 strcpy(path + len, "/refs");
268 if (access(path, X_OK))
8098a178 269 return 0;
ad1a382f
SP
270
271 strcpy(path + len, "/HEAD");
c847f537 272 if (validate_headref(path))
ad1a382f
SP
273 return 0;
274
8098a178 275 return 1;
5f5608bc
LT
276}
277
68025633
JS
278int is_inside_git_dir(void)
279{
e90fdc39
JS
280 if (inside_git_dir < 0)
281 inside_git_dir = is_inside_dir(get_git_dir());
282 return inside_git_dir;
892c41b9
ML
283}
284
892c41b9
ML
285int is_inside_work_tree(void)
286{
e90fdc39
JS
287 if (inside_work_tree < 0)
288 inside_work_tree = is_inside_dir(get_git_work_tree());
289 return inside_work_tree;
892c41b9
ML
290}
291
f3fa1838
JH
292void setup_work_tree(void)
293{
354e6534
JS
294 const char *work_tree, *git_dir;
295 static int initialized = 0;
296
297 if (initialized)
298 return;
299 work_tree = get_git_work_tree();
300 git_dir = get_git_dir();
59f0f2f3 301 if (!is_absolute_path(git_dir))
e2a57aac 302 git_dir = real_path(get_git_dir());
59f0f2f3
MH
303 if (!work_tree || chdir(work_tree))
304 die("This operation must be run in a work tree");
0ed74813
NTND
305
306 /*
307 * Make sure subsequent git processes find correct worktree
308 * if $GIT_WORK_TREE is set relative
309 */
310 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
311 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
312
41894ae3 313 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 314 initialized = 1;
59f0f2f3
MH
315}
316
337e51ce 317static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 318{
337e51ce
NTND
319 char repo_config[PATH_MAX+1];
320
321 /*
322 * git_config() can't be used here because it calls git_pathdup()
323 * to get $GIT_CONFIG/config. That call will make setup_git_env()
324 * set git_dir to ".git".
325 *
326 * We are in gitdir setup, no git dir has been found useable yet.
327 * Use a gentler version of git_config() to check if this repo
328 * is a good one.
329 */
330 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
331 git_config_early(check_repository_format_version, NULL, repo_config);
9459aa77
NTND
332 if (GIT_REPO_VERSION < repository_format_version) {
333 if (!nongit_ok)
334 die ("Expected git repo version <= %d, found %d",
335 GIT_REPO_VERSION, repository_format_version);
336 warning("Expected git repo version <= %d, found %d",
337 GIT_REPO_VERSION, repository_format_version);
338 warning("Please upgrade Git");
339 *nongit_ok = -1;
340 return -1;
341 }
342 return 0;
343}
344
b44ebb19
LH
345/*
346 * Try to read the location of the git directory from the .git file,
347 * return path to git directory if found.
348 */
13d6ec91 349const char *read_gitfile(const char *path)
b44ebb19
LH
350{
351 char *buf;
40c813e0
BK
352 char *dir;
353 const char *slash;
b44ebb19
LH
354 struct stat st;
355 int fd;
b1905aea 356 ssize_t len;
b44ebb19
LH
357
358 if (stat(path, &st))
359 return NULL;
360 if (!S_ISREG(st.st_mode))
361 return NULL;
362 fd = open(path, O_RDONLY);
363 if (fd < 0)
d824cbba 364 die_errno("Error opening '%s'", path);
b44ebb19
LH
365 buf = xmalloc(st.st_size + 1);
366 len = read_in_full(fd, buf, st.st_size);
367 close(fd);
368 if (len != st.st_size)
369 die("Error reading %s", path);
370 buf[len] = '\0';
371 if (prefixcmp(buf, "gitdir: "))
372 die("Invalid gitfile format: %s", path);
373 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
374 len--;
375 if (len < 9)
376 die("No path in gitfile: %s", path);
377 buf[len] = '\0';
40c813e0
BK
378 dir = buf + 8;
379
380 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
381 size_t pathlen = slash+1 - path;
382 size_t dirlen = pathlen + len - 8;
383 dir = xmalloc(dirlen + 1);
384 strncpy(dir, path, pathlen);
385 strncpy(dir + pathlen, buf + 8, len - 8);
386 dir[dirlen] = '\0';
387 free(buf);
388 buf = dir;
389 }
390
391 if (!is_git_directory(dir))
392 die("Not a git repository: %s", dir);
e2a57aac 393 path = real_path(dir);
40c813e0 394
b44ebb19
LH
395 free(buf);
396 return path;
397}
398
e4e30347 399static const char *setup_explicit_git_dir(const char *gitdirenv,
b3f66fd3
NTND
400 char *cwd, int len,
401 int *nongit_ok)
e4e30347 402{
b3f66fd3
NTND
403 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
404 const char *worktree;
405 char *gitfile;
9b125da4 406 int offset;
e4e30347
JN
407
408 if (PATH_MAX - 40 < strlen(gitdirenv))
409 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 410
13d6ec91 411 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
412 if (gitfile) {
413 gitfile = xstrdup(gitfile);
414 gitdirenv = gitfile;
415 }
416
e4e30347
JN
417 if (!is_git_directory(gitdirenv)) {
418 if (nongit_ok) {
419 *nongit_ok = 1;
b3f66fd3 420 free(gitfile);
e4e30347
JN
421 return NULL;
422 }
423 die("Not a git repository: '%s'", gitdirenv);
424 }
b3f66fd3
NTND
425
426 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
427 free(gitfile);
428 return NULL;
e4e30347 429 }
b3f66fd3
NTND
430
431 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
432 if (work_tree_env)
433 set_git_work_tree(work_tree_env);
434 else if (is_bare_repository_cfg > 0) {
435 if (git_work_tree_cfg) /* #22.2, #30 */
436 die("core.bare and core.worktree do not make sense");
437
438 /* #18, #26 */
439 set_git_dir(gitdirenv);
440 free(gitfile);
e4e30347 441 return NULL;
b3f66fd3
NTND
442 }
443 else if (git_work_tree_cfg) { /* #6, #14 */
444 if (is_absolute_path(git_work_tree_cfg))
445 set_git_work_tree(git_work_tree_cfg);
446 else {
447 char core_worktree[PATH_MAX];
448 if (chdir(gitdirenv))
449 die_errno("Could not chdir to '%s'", gitdirenv);
450 if (chdir(git_work_tree_cfg))
451 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
452 if (!getcwd(core_worktree, PATH_MAX))
453 die_errno("Could not get directory '%s'", git_work_tree_cfg);
454 if (chdir(cwd))
455 die_errno("Could not come back to cwd");
456 set_git_work_tree(core_worktree);
457 }
458 }
2cd83d10
JK
459 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
460 /* #16d */
461 set_git_dir(gitdirenv);
462 free(gitfile);
463 return NULL;
464 }
b3f66fd3
NTND
465 else /* #2, #10 */
466 set_git_work_tree(".");
467
468 /* set_git_work_tree() must have been called by now */
469 worktree = get_git_work_tree();
470
471 /* both get_git_work_tree() and cwd are already normalized */
472 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
473 set_git_dir(gitdirenv);
474 free(gitfile);
e4e30347 475 return NULL;
b3f66fd3 476 }
e4e30347 477
9b125da4
NTND
478 offset = dir_inside_of(cwd, worktree);
479 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 480 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
481 if (chdir(worktree))
482 die_errno("Could not chdir to '%s'", worktree);
483 cwd[len++] = '/';
484 cwd[len] = '\0';
485 free(gitfile);
9b125da4 486 return cwd + offset;
93a00542 487 }
b3f66fd3
NTND
488
489 /* cwd outside worktree */
490 set_git_dir(gitdirenv);
491 free(gitfile);
492 return NULL;
93a00542
JN
493}
494
9951d3b3
NTND
495static const char *setup_discovered_git_dir(const char *gitdir,
496 char *cwd, int offset, int len,
497 int *nongit_ok)
98937bef 498{
9951d3b3
NTND
499 if (check_repository_format_gently(gitdir, nongit_ok))
500 return NULL;
98937bef 501
4868b2ea
JN
502 /* --work-tree is set without --git-dir; use discovered one */
503 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
504 if (offset != len && !is_absolute_path(gitdir))
e2a57aac 505 gitdir = xstrdup(real_path(gitdir));
4868b2ea
JN
506 if (chdir(cwd))
507 die_errno("Could not come back to cwd");
508 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
509 }
510
9951d3b3
NTND
511 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
512 if (is_bare_repository_cfg > 0) {
e2a57aac 513 set_git_dir(offset == len ? gitdir : real_path(gitdir));
9951d3b3
NTND
514 if (chdir(cwd))
515 die_errno("Could not come back to cwd");
98937bef 516 return NULL;
9951d3b3 517 }
98937bef 518
9951d3b3
NTND
519 /* #0, #1, #5, #8, #9, #12, #13 */
520 set_git_work_tree(".");
521 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
522 set_git_dir(gitdir);
98937bef 523 inside_git_dir = 0;
9951d3b3 524 inside_work_tree = 1;
98937bef
NTND
525 if (offset == len)
526 return NULL;
527
528 /* Make "offset" point to past the '/', and add a '/' at the end */
529 offset++;
530 cwd[len++] = '/';
531 cwd[len] = 0;
532 return cwd + offset;
533}
534
1cd8031b
NTND
535/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
536static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
68698da5
JN
537{
538 int root_len;
539
1cd8031b
NTND
540 if (check_repository_format_gently(".", nongit_ok))
541 return NULL;
542
2cd83d10
JK
543 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
544
4868b2ea
JN
545 /* --work-tree is set without --git-dir; use discovered one */
546 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
547 const char *gitdir;
548
549 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
550 if (chdir(cwd))
551 die_errno("Could not come back to cwd");
552 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
553 }
554
68698da5 555 inside_git_dir = 1;
1cd8031b 556 inside_work_tree = 0;
68698da5 557 if (offset != len) {
8fc0ae80
NTND
558 if (chdir(cwd))
559 die_errno("Cannot come back to cwd");
68698da5
JN
560 root_len = offset_1st_component(cwd);
561 cwd[offset > root_len ? offset : root_len] = '\0';
562 set_git_dir(cwd);
337e51ce 563 }
1cd8031b 564 else
68698da5 565 set_git_dir(".");
68698da5
JN
566 return NULL;
567}
568
f161edeb
JN
569static const char *setup_nongit(const char *cwd, int *nongit_ok)
570{
571 if (!nongit_ok)
572 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
573 if (chdir(cwd))
574 die_errno("Cannot come back to cwd");
575 *nongit_ok = 1;
576 return NULL;
577}
578
2565b43b 579static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
580{
581 struct stat buf;
2565b43b
CB
582 if (stat(path, &buf)) {
583 die_errno("failed to stat '%*s%s%s'",
584 prefix_len,
60c98d1e
JN
585 prefix ? prefix : "",
586 prefix ? "/" : "", path);
2565b43b 587 }
60c98d1e
JN
588 return buf.st_dev;
589}
590
9e2326c7 591/*
1b77d83c
MH
592 * A "string_list_each_func_t" function that canonicalizes an entry
593 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
594 * discards it if unusable. The presence of an empty entry in
595 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
596 * subsequent entries.
9e2326c7 597 */
1b77d83c 598static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 599 void *cb_data)
9e2326c7 600{
7ec30aaa 601 int *empty_entry_found = cb_data;
1b77d83c 602 char *ceil = item->string;
9e2326c7 603
7ec30aaa
MH
604 if (!*ceil) {
605 *empty_entry_found = 1;
9e2326c7 606 return 0;
7ec30aaa 607 } else if (!is_absolute_path(ceil)) {
9e2326c7 608 return 0;
7ec30aaa
MH
609 } else if (*empty_entry_found) {
610 /* Keep entry but do not canonicalize it */
611 return 1;
612 } else {
613 const char *real_path = real_path_if_valid(ceil);
614 if (!real_path)
615 return 0;
616 free(item->string);
617 item->string = xstrdup(real_path);
618 return 1;
619 }
9e2326c7
MH
620}
621
e90fdc39
JS
622/*
623 * We cannot decide in this function whether we are in the work tree or
624 * not, since the config can only be read _after_ this function was called.
625 */
a60645f9 626static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 627{
0454dd93 628 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 629 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
abf03eeb 630 static char cwd[PATH_MAX + 1];
9951d3b3
NTND
631 const char *gitdirenv, *ret;
632 char *gitfile;
31171d9e 633 int len, offset, offset_parent, ceil_offset = -1;
c7d1d1b1
RH
634 dev_t current_device = 0;
635 int one_filesystem = 1;
d288a700 636
af05d679
SG
637 /*
638 * Let's assume that we are in a git repository.
639 * If it turns out later that we are somewhere else, the value will be
640 * updated accordingly.
641 */
642 if (nongit_ok)
643 *nongit_ok = 0;
644
abf03eeb 645 if (!getcwd(cwd, sizeof(cwd) - 1))
b3f66fd3
NTND
646 die_errno("Unable to read current working directory");
647 offset = len = strlen(cwd);
648
e90fdc39
JS
649 /*
650 * If GIT_DIR is set explicitly, we're not going
651 * to do any discovery, but we still do repository
652 * validation.
653 */
ad1a382f 654 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e4e30347 655 if (gitdirenv)
b3f66fd3 656 return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
d288a700 657
31171d9e 658 if (env_ceiling_dirs) {
7ec30aaa
MH
659 int empty_entry_found = 0;
660
31171d9e 661 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 662 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 663 canonicalize_ceiling_entry, &empty_entry_found);
31171d9e
MH
664 ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs);
665 string_list_clear(&ceiling_dirs, 0);
666 }
667
17d778e7
JH
668 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
669 ceil_offset = 1;
d288a700 670
892c41b9 671 /*
e90fdc39 672 * Test in the following order (relative to the cwd):
b44ebb19 673 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
674 * - .git/
675 * - ./ (bare)
b44ebb19 676 * - ../.git
e90fdc39
JS
677 * - ../.git/
678 * - ../ (bare)
679 * - ../../.git/
680 * etc.
892c41b9 681 */
cf87463e 682 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 683 if (one_filesystem)
2565b43b 684 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 685 for (;;) {
13d6ec91 686 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
687 if (gitfile)
688 gitdirenv = gitfile = xstrdup(gitfile);
689 else {
690 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
691 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
692 }
693
694 if (gitdirenv) {
695 ret = setup_discovered_git_dir(gitdirenv,
696 cwd, offset, len,
697 nongit_ok);
698 free(gitfile);
699 return ret;
700 }
701 free(gitfile);
702
68698da5 703 if (is_git_directory("."))
1cd8031b
NTND
704 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
705
2565b43b
CB
706 offset_parent = offset;
707 while (--offset_parent > ceil_offset && cwd[offset_parent] != '/');
708 if (offset_parent <= ceil_offset)
f161edeb 709 return setup_nongit(cwd, nongit_ok);
8030e442 710 if (one_filesystem) {
2565b43b 711 dev_t parent_device = get_device_or_die("..", cwd, offset);
60c98d1e 712 if (parent_device != current_device) {
8030e442
LD
713 if (nongit_ok) {
714 if (chdir(cwd))
715 die_errno("Cannot come back to cwd");
716 *nongit_ok = 1;
717 return NULL;
718 }
719 cwd[offset] = '\0';
2565b43b 720 die("Not a git repository (or any parent up to mount point %s)\n"
cf87463e 721 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
8030e442
LD
722 }
723 }
502ffe34
LD
724 if (chdir("..")) {
725 cwd[offset] = '\0';
d824cbba 726 die_errno("Cannot change to '%s/..'", cwd);
502ffe34 727 }
2565b43b 728 offset = offset_parent;
892c41b9 729 }
d288a700 730}
5e7bfe25 731
a60645f9
NTND
732const char *setup_git_directory_gently(int *nongit_ok)
733{
734 const char *prefix;
735
736 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f 737 if (prefix)
a6f7f9a3 738 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 739 else
a6f7f9a3 740 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 741
f07d6a1a 742 if (startup_info) {
a60645f9 743 startup_info->have_repository = !nongit_ok || !*nongit_ok;
f07d6a1a
NTND
744 startup_info->prefix = prefix;
745 }
a60645f9
NTND
746 return prefix;
747}
748
94df2506
JH
749int git_config_perm(const char *var, const char *value)
750{
06cbe855
HO
751 int i;
752 char *endptr;
753
754 if (value == NULL)
755 return PERM_GROUP;
756
757 if (!strcmp(value, "umask"))
758 return PERM_UMASK;
759 if (!strcmp(value, "group"))
760 return PERM_GROUP;
761 if (!strcmp(value, "all") ||
762 !strcmp(value, "world") ||
763 !strcmp(value, "everybody"))
764 return PERM_EVERYBODY;
765
766 /* Parse octal numbers */
767 i = strtol(value, &endptr, 8);
768
769 /* If not an octal number, maybe true/false? */
770 if (*endptr != 0)
771 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
772
773 /*
774 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 775 * a chmod value to restrict to.
06cbe855
HO
776 */
777 switch (i) {
778 case PERM_UMASK: /* 0 */
779 return PERM_UMASK;
780 case OLD_PERM_GROUP: /* 1 */
781 return PERM_GROUP;
782 case OLD_PERM_EVERYBODY: /* 2 */
783 return PERM_EVERYBODY;
94df2506 784 }
06cbe855
HO
785
786 /* A filemode value was given: 0xxx */
787
788 if ((i & 0600) != 0600)
789 die("Problem with core.sharedRepository filemode value "
790 "(0%.3o).\nThe owner of files must always have "
791 "read and write permissions.", i);
792
793 /*
794 * Mask filemode value. Others can not get write permission.
795 * x flags for directories are handled separately.
796 */
5a688fe4 797 return -(i & 0666);
94df2506
JH
798}
799
ef90d6d4 800int check_repository_format_version(const char *var, const char *value, void *cb)
ab9cb76f 801{
299726d5
JS
802 if (strcmp(var, "core.repositoryformatversion") == 0)
803 repository_format_version = git_config_int(var, value);
457f06d6 804 else if (strcmp(var, "core.sharedrepository") == 0)
94df2506 805 shared_repository = git_config_perm(var, value);
e90fdc39
JS
806 else if (strcmp(var, "core.bare") == 0) {
807 is_bare_repository_cfg = git_config_bool(var, value);
808 if (is_bare_repository_cfg == 1)
809 inside_work_tree = -1;
810 } else if (strcmp(var, "core.worktree") == 0) {
180483c5
JH
811 if (!value)
812 return config_error_nonbool(var);
8e0f7003 813 free(git_work_tree_cfg);
e90fdc39
JS
814 git_work_tree_cfg = xstrdup(value);
815 inside_work_tree = -1;
816 }
299726d5 817 return 0;
ab9cb76f
JH
818}
819
820int check_repository_format(void)
821{
337e51ce 822 return check_repository_format_gently(get_git_dir(), NULL);
ab9cb76f
JH
823}
824
e1e5ec86
CB
825/*
826 * Returns the "prefix", a path to the current working directory
827 * relative to the work tree root, or NULL, if the current working
828 * directory is not a strict subdirectory of the work tree root. The
829 * prefix always ends with a '/' character.
830 */
5e7bfe25
JH
831const char *setup_git_directory(void)
832{
b3f66fd3 833 return setup_git_directory_gently(NULL);
5e7bfe25 834}
abc06822
FG
835
836const char *resolve_gitdir(const char *suspect)
837{
838 if (is_git_directory(suspect))
839 return suspect;
efc5fb6a 840 return read_gitfile(suspect);
abc06822 841}
1d999ddd
TR
842
843/* if any standard file descriptor is missing open it to /dev/null */
844void sanitize_stdfds(void)
845{
846 int fd = open("/dev/null", O_RDWR, 0);
847 while (fd != -1 && fd < 2)
848 fd = dup(fd);
849 if (fd == -1)
850 die_errno("open /dev/null or dup failed");
851 if (fd > 2)
852 close(fd);
853}