setup: don't dereference in-tree symlinks for absolute 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
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)) {
655ee9ea 89 sanitized = xmalloc(strlen(path) + 1);
645a29c4
NTND
90 if (remaining_prefix)
91 *remaining_prefix = 0;
655ee9ea
MEW
92 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
93 free(sanitized);
94 return NULL;
95 }
96 if (abspath_part_inside_repo(sanitized)) {
97 free(sanitized);
98 return NULL;
99 }
18e051a3
CMAB
100 } else {
101 sanitized = xmalloc(len + strlen(path) + 1);
d089ebaa
JH
102 if (len)
103 memcpy(sanitized, prefix, len);
104 strcpy(sanitized + len, path);
645a29c4
NTND
105 if (remaining_prefix)
106 *remaining_prefix = len;
655ee9ea 107 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
546e0fd9
JK
108 free(sanitized);
109 return NULL;
d089ebaa 110 }
d089ebaa
JH
111 }
112 return sanitized;
f332726e
LT
113}
114
546e0fd9
JK
115char *prefix_path(const char *prefix, int len, const char *path)
116{
645a29c4 117 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
118 if (!r)
119 die("'%s' is outside repository", path);
120 return r;
121}
122
123int path_inside_repo(const char *prefix, const char *path)
124{
125 int len = prefix ? strlen(prefix) : 0;
645a29c4 126 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
127 if (r) {
128 free(r);
129 return 1;
130 }
131 return 0;
132}
133
c6e8c800
JH
134int check_filename(const char *prefix, const char *arg)
135{
136 const char *name;
137 struct stat st;
138
4db86e8b
NTND
139 if (!prefixcmp(arg, ":/")) {
140 if (arg[2] == '\0') /* ":/" is root dir, always exists */
141 return 1;
142 name = arg + 2;
143 } else if (prefix)
144 name = prefix_filename(prefix, strlen(prefix), arg);
145 else
146 name = arg;
c6e8c800
JH
147 if (!lstat(name, &st))
148 return 1; /* file exists */
149 if (errno == ENOENT || errno == ENOTDIR)
150 return 0; /* file does not exist */
151 die_errno("failed to stat '%s'", arg);
152}
153
023e37c3
MM
154static void NORETURN die_verify_filename(const char *prefix,
155 const char *arg,
156 int diagnose_misspelt_rev)
009fee47 157{
023e37c3
MM
158 if (!diagnose_misspelt_rev)
159 die("%s: no such path in the working tree.\n"
4d4b5739 160 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
023e37c3 161 arg);
0e539dca
JH
162 /*
163 * Saying "'(icase)foo' does not exist in the index" when the
164 * user gave us ":(icase)foo" is just stupid. A magic pathspec
165 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 166 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
167 */
168 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 169 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 170
009fee47
MM
171 /* ... or fall back the most general message. */
172 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
4d4b5739
MM
173 "Use '--' to separate paths from revisions, like this:\n"
174 "'git <command> [<revision>...] -- [<file>...]'", arg);
009fee47
MM
175
176}
177
e23d0b4a
LT
178/*
179 * Verify a filename that we got as an argument for a pathspec
180 * entry. Note that a filename that begins with "-" never verifies
181 * as true, because even if such a filename were to exist, we want
182 * it to be preceded by the "--" marker (or we want the user to
183 * use a format like "./-filename")
023e37c3
MM
184 *
185 * The "diagnose_misspelt_rev" is used to provide a user-friendly
186 * diagnosis when dying upon finding that "name" is not a pathname.
187 * If set to 1, the diagnosis will try to diagnose "name" as an
188 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
189 * will only complain about an inexisting file.
190 *
191 * This function is typically called to check that a "file or rev"
192 * argument is unambiguous. In this case, the caller will want
193 * diagnose_misspelt_rev == 1 when verifying the first non-rev
194 * argument (which could have been a revision), and
195 * diagnose_misspelt_rev == 0 for the next ones (because we already
196 * saw a filename, there's not ambiguity anymore).
e23d0b4a 197 */
023e37c3
MM
198void verify_filename(const char *prefix,
199 const char *arg,
200 int diagnose_misspelt_rev)
e23d0b4a 201{
e23d0b4a
LT
202 if (*arg == '-')
203 die("bad flag '%s' used after filename", arg);
c6e8c800 204 if (check_filename(prefix, arg))
e23d0b4a 205 return;
023e37c3 206 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
207}
208
ea92f41f
JH
209/*
210 * Opposite of the above: the command line did not have -- marker
211 * and we parsed the arg as a refname. It should not be interpretable
212 * as a filename.
213 */
214void verify_non_filename(const char *prefix, const char *arg)
215{
7ae3df8c 216 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 217 return;
ea92f41f
JH
218 if (*arg == '-')
219 return; /* flag */
c6e8c800
JH
220 if (!check_filename(prefix, arg))
221 return;
222 die("ambiguous argument '%s': both revision and filename\n"
4d4b5739
MM
223 "Use '--' to separate paths from revisions, like this:\n"
224 "'git <command> [<revision>...] -- [<file>...]'", arg);
ea92f41f
JH
225}
226
d288a700 227
5f5608bc 228/*
ad1a382f 229 * Test if it looks like we're at a git directory.
5e7bfe25 230 * We want to see:
5f5608bc 231 *
790296fd 232 * - either an objects/ directory _or_ the proper
5f5608bc 233 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 234 * - a refs/ directory
8098a178 235 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
236 * a proper "ref:", or a regular file HEAD that has a properly
237 * formatted sha1 object name.
5f5608bc 238 */
b3256eb8 239int is_git_directory(const char *suspect)
5f5608bc 240{
ad1a382f
SP
241 char path[PATH_MAX];
242 size_t len = strlen(suspect);
243
3c9d0414
GB
244 if (PATH_MAX <= len + strlen("/objects"))
245 die("Too long path: %.*s", 60, suspect);
ad1a382f
SP
246 strcpy(path, suspect);
247 if (getenv(DB_ENVIRONMENT)) {
248 if (access(getenv(DB_ENVIRONMENT), X_OK))
249 return 0;
250 }
251 else {
252 strcpy(path + len, "/objects");
253 if (access(path, X_OK))
254 return 0;
255 }
256
257 strcpy(path + len, "/refs");
258 if (access(path, X_OK))
8098a178 259 return 0;
ad1a382f
SP
260
261 strcpy(path + len, "/HEAD");
c847f537 262 if (validate_headref(path))
ad1a382f
SP
263 return 0;
264
8098a178 265 return 1;
5f5608bc
LT
266}
267
68025633
JS
268int is_inside_git_dir(void)
269{
e90fdc39
JS
270 if (inside_git_dir < 0)
271 inside_git_dir = is_inside_dir(get_git_dir());
272 return inside_git_dir;
892c41b9
ML
273}
274
892c41b9
ML
275int is_inside_work_tree(void)
276{
e90fdc39
JS
277 if (inside_work_tree < 0)
278 inside_work_tree = is_inside_dir(get_git_work_tree());
279 return inside_work_tree;
892c41b9
ML
280}
281
f3fa1838
JH
282void setup_work_tree(void)
283{
354e6534
JS
284 const char *work_tree, *git_dir;
285 static int initialized = 0;
286
287 if (initialized)
288 return;
289 work_tree = get_git_work_tree();
290 git_dir = get_git_dir();
59f0f2f3 291 if (!is_absolute_path(git_dir))
e2a57aac 292 git_dir = real_path(get_git_dir());
59f0f2f3
MH
293 if (!work_tree || chdir(work_tree))
294 die("This operation must be run in a work tree");
0ed74813
NTND
295
296 /*
297 * Make sure subsequent git processes find correct worktree
298 * if $GIT_WORK_TREE is set relative
299 */
300 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
301 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
302
41894ae3 303 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 304 initialized = 1;
59f0f2f3
MH
305}
306
337e51ce 307static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 308{
337e51ce
NTND
309 char repo_config[PATH_MAX+1];
310
311 /*
312 * git_config() can't be used here because it calls git_pathdup()
313 * to get $GIT_CONFIG/config. That call will make setup_git_env()
314 * set git_dir to ".git".
315 *
316 * We are in gitdir setup, no git dir has been found useable yet.
317 * Use a gentler version of git_config() to check if this repo
318 * is a good one.
319 */
320 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
321 git_config_early(check_repository_format_version, NULL, repo_config);
9459aa77
NTND
322 if (GIT_REPO_VERSION < repository_format_version) {
323 if (!nongit_ok)
324 die ("Expected git repo version <= %d, found %d",
325 GIT_REPO_VERSION, repository_format_version);
326 warning("Expected git repo version <= %d, found %d",
327 GIT_REPO_VERSION, repository_format_version);
328 warning("Please upgrade Git");
329 *nongit_ok = -1;
330 return -1;
331 }
332 return 0;
333}
334
b44ebb19
LH
335/*
336 * Try to read the location of the git directory from the .git file,
337 * return path to git directory if found.
338 */
13d6ec91 339const char *read_gitfile(const char *path)
b44ebb19
LH
340{
341 char *buf;
40c813e0
BK
342 char *dir;
343 const char *slash;
b44ebb19
LH
344 struct stat st;
345 int fd;
b1905aea 346 ssize_t len;
b44ebb19
LH
347
348 if (stat(path, &st))
349 return NULL;
350 if (!S_ISREG(st.st_mode))
351 return NULL;
352 fd = open(path, O_RDONLY);
353 if (fd < 0)
d824cbba 354 die_errno("Error opening '%s'", path);
b44ebb19
LH
355 buf = xmalloc(st.st_size + 1);
356 len = read_in_full(fd, buf, st.st_size);
357 close(fd);
358 if (len != st.st_size)
359 die("Error reading %s", path);
360 buf[len] = '\0';
361 if (prefixcmp(buf, "gitdir: "))
362 die("Invalid gitfile format: %s", path);
363 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
364 len--;
365 if (len < 9)
366 die("No path in gitfile: %s", path);
367 buf[len] = '\0';
40c813e0
BK
368 dir = buf + 8;
369
370 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
371 size_t pathlen = slash+1 - path;
372 size_t dirlen = pathlen + len - 8;
373 dir = xmalloc(dirlen + 1);
374 strncpy(dir, path, pathlen);
375 strncpy(dir + pathlen, buf + 8, len - 8);
376 dir[dirlen] = '\0';
377 free(buf);
378 buf = dir;
379 }
380
381 if (!is_git_directory(dir))
382 die("Not a git repository: %s", dir);
e2a57aac 383 path = real_path(dir);
40c813e0 384
b44ebb19
LH
385 free(buf);
386 return path;
387}
388
e4e30347 389static const char *setup_explicit_git_dir(const char *gitdirenv,
b3f66fd3
NTND
390 char *cwd, int len,
391 int *nongit_ok)
e4e30347 392{
b3f66fd3
NTND
393 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
394 const char *worktree;
395 char *gitfile;
9b125da4 396 int offset;
e4e30347
JN
397
398 if (PATH_MAX - 40 < strlen(gitdirenv))
399 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 400
13d6ec91 401 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
402 if (gitfile) {
403 gitfile = xstrdup(gitfile);
404 gitdirenv = gitfile;
405 }
406
e4e30347
JN
407 if (!is_git_directory(gitdirenv)) {
408 if (nongit_ok) {
409 *nongit_ok = 1;
b3f66fd3 410 free(gitfile);
e4e30347
JN
411 return NULL;
412 }
413 die("Not a git repository: '%s'", gitdirenv);
414 }
b3f66fd3
NTND
415
416 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
417 free(gitfile);
418 return NULL;
e4e30347 419 }
b3f66fd3
NTND
420
421 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
422 if (work_tree_env)
423 set_git_work_tree(work_tree_env);
424 else if (is_bare_repository_cfg > 0) {
425 if (git_work_tree_cfg) /* #22.2, #30 */
426 die("core.bare and core.worktree do not make sense");
427
428 /* #18, #26 */
429 set_git_dir(gitdirenv);
430 free(gitfile);
e4e30347 431 return NULL;
b3f66fd3
NTND
432 }
433 else if (git_work_tree_cfg) { /* #6, #14 */
434 if (is_absolute_path(git_work_tree_cfg))
435 set_git_work_tree(git_work_tree_cfg);
436 else {
437 char core_worktree[PATH_MAX];
438 if (chdir(gitdirenv))
439 die_errno("Could not chdir to '%s'", gitdirenv);
440 if (chdir(git_work_tree_cfg))
441 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
442 if (!getcwd(core_worktree, PATH_MAX))
443 die_errno("Could not get directory '%s'", git_work_tree_cfg);
444 if (chdir(cwd))
445 die_errno("Could not come back to cwd");
446 set_git_work_tree(core_worktree);
447 }
448 }
2cd83d10
JK
449 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
450 /* #16d */
451 set_git_dir(gitdirenv);
452 free(gitfile);
453 return NULL;
454 }
b3f66fd3
NTND
455 else /* #2, #10 */
456 set_git_work_tree(".");
457
458 /* set_git_work_tree() must have been called by now */
459 worktree = get_git_work_tree();
460
461 /* both get_git_work_tree() and cwd are already normalized */
462 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
463 set_git_dir(gitdirenv);
464 free(gitfile);
e4e30347 465 return NULL;
b3f66fd3 466 }
e4e30347 467
9b125da4
NTND
468 offset = dir_inside_of(cwd, worktree);
469 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 470 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
471 if (chdir(worktree))
472 die_errno("Could not chdir to '%s'", worktree);
473 cwd[len++] = '/';
474 cwd[len] = '\0';
475 free(gitfile);
9b125da4 476 return cwd + offset;
93a00542 477 }
b3f66fd3
NTND
478
479 /* cwd outside worktree */
480 set_git_dir(gitdirenv);
481 free(gitfile);
482 return NULL;
93a00542
JN
483}
484
9951d3b3
NTND
485static const char *setup_discovered_git_dir(const char *gitdir,
486 char *cwd, int offset, int len,
487 int *nongit_ok)
98937bef 488{
9951d3b3
NTND
489 if (check_repository_format_gently(gitdir, nongit_ok))
490 return NULL;
98937bef 491
4868b2ea
JN
492 /* --work-tree is set without --git-dir; use discovered one */
493 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
494 if (offset != len && !is_absolute_path(gitdir))
e2a57aac 495 gitdir = xstrdup(real_path(gitdir));
4868b2ea
JN
496 if (chdir(cwd))
497 die_errno("Could not come back to cwd");
498 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
499 }
500
9951d3b3
NTND
501 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
502 if (is_bare_repository_cfg > 0) {
e2a57aac 503 set_git_dir(offset == len ? gitdir : real_path(gitdir));
9951d3b3
NTND
504 if (chdir(cwd))
505 die_errno("Could not come back to cwd");
98937bef 506 return NULL;
9951d3b3 507 }
98937bef 508
9951d3b3
NTND
509 /* #0, #1, #5, #8, #9, #12, #13 */
510 set_git_work_tree(".");
511 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
512 set_git_dir(gitdir);
98937bef 513 inside_git_dir = 0;
9951d3b3 514 inside_work_tree = 1;
98937bef
NTND
515 if (offset == len)
516 return NULL;
517
518 /* Make "offset" point to past the '/', and add a '/' at the end */
519 offset++;
520 cwd[len++] = '/';
521 cwd[len] = 0;
522 return cwd + offset;
523}
524
1cd8031b
NTND
525/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
526static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
68698da5
JN
527{
528 int root_len;
529
1cd8031b
NTND
530 if (check_repository_format_gently(".", nongit_ok))
531 return NULL;
532
2cd83d10
JK
533 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
534
4868b2ea
JN
535 /* --work-tree is set without --git-dir; use discovered one */
536 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
537 const char *gitdir;
538
539 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
540 if (chdir(cwd))
541 die_errno("Could not come back to cwd");
542 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
543 }
544
68698da5 545 inside_git_dir = 1;
1cd8031b 546 inside_work_tree = 0;
68698da5 547 if (offset != len) {
8fc0ae80
NTND
548 if (chdir(cwd))
549 die_errno("Cannot come back to cwd");
68698da5
JN
550 root_len = offset_1st_component(cwd);
551 cwd[offset > root_len ? offset : root_len] = '\0';
552 set_git_dir(cwd);
337e51ce 553 }
1cd8031b 554 else
68698da5 555 set_git_dir(".");
68698da5
JN
556 return NULL;
557}
558
f161edeb
JN
559static const char *setup_nongit(const char *cwd, int *nongit_ok)
560{
561 if (!nongit_ok)
562 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
563 if (chdir(cwd))
564 die_errno("Cannot come back to cwd");
565 *nongit_ok = 1;
566 return NULL;
567}
568
2565b43b 569static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
570{
571 struct stat buf;
2565b43b
CB
572 if (stat(path, &buf)) {
573 die_errno("failed to stat '%*s%s%s'",
574 prefix_len,
60c98d1e
JN
575 prefix ? prefix : "",
576 prefix ? "/" : "", path);
2565b43b 577 }
60c98d1e
JN
578 return buf.st_dev;
579}
580
9e2326c7 581/*
1b77d83c
MH
582 * A "string_list_each_func_t" function that canonicalizes an entry
583 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
584 * discards it if unusable. The presence of an empty entry in
585 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
586 * subsequent entries.
9e2326c7 587 */
1b77d83c 588static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 589 void *cb_data)
9e2326c7 590{
7ec30aaa 591 int *empty_entry_found = cb_data;
1b77d83c 592 char *ceil = item->string;
9e2326c7 593
7ec30aaa
MH
594 if (!*ceil) {
595 *empty_entry_found = 1;
9e2326c7 596 return 0;
7ec30aaa 597 } else if (!is_absolute_path(ceil)) {
9e2326c7 598 return 0;
7ec30aaa
MH
599 } else if (*empty_entry_found) {
600 /* Keep entry but do not canonicalize it */
601 return 1;
602 } else {
603 const char *real_path = real_path_if_valid(ceil);
604 if (!real_path)
605 return 0;
606 free(item->string);
607 item->string = xstrdup(real_path);
608 return 1;
609 }
9e2326c7
MH
610}
611
e90fdc39
JS
612/*
613 * We cannot decide in this function whether we are in the work tree or
614 * not, since the config can only be read _after_ this function was called.
615 */
a60645f9 616static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 617{
0454dd93 618 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 619 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
abf03eeb 620 static char cwd[PATH_MAX + 1];
9951d3b3
NTND
621 const char *gitdirenv, *ret;
622 char *gitfile;
31171d9e 623 int len, offset, offset_parent, ceil_offset = -1;
c7d1d1b1
RH
624 dev_t current_device = 0;
625 int one_filesystem = 1;
d288a700 626
af05d679
SG
627 /*
628 * Let's assume that we are in a git repository.
629 * If it turns out later that we are somewhere else, the value will be
630 * updated accordingly.
631 */
632 if (nongit_ok)
633 *nongit_ok = 0;
634
abf03eeb 635 if (!getcwd(cwd, sizeof(cwd) - 1))
b3f66fd3
NTND
636 die_errno("Unable to read current working directory");
637 offset = len = strlen(cwd);
638
e90fdc39
JS
639 /*
640 * If GIT_DIR is set explicitly, we're not going
641 * to do any discovery, but we still do repository
642 * validation.
643 */
ad1a382f 644 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e4e30347 645 if (gitdirenv)
b3f66fd3 646 return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
d288a700 647
31171d9e 648 if (env_ceiling_dirs) {
7ec30aaa
MH
649 int empty_entry_found = 0;
650
31171d9e 651 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 652 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 653 canonicalize_ceiling_entry, &empty_entry_found);
31171d9e
MH
654 ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs);
655 string_list_clear(&ceiling_dirs, 0);
656 }
657
17d778e7
JH
658 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
659 ceil_offset = 1;
d288a700 660
892c41b9 661 /*
e90fdc39 662 * Test in the following order (relative to the cwd):
b44ebb19 663 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
664 * - .git/
665 * - ./ (bare)
b44ebb19 666 * - ../.git
e90fdc39
JS
667 * - ../.git/
668 * - ../ (bare)
669 * - ../../.git/
670 * etc.
892c41b9 671 */
cf87463e 672 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 673 if (one_filesystem)
2565b43b 674 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 675 for (;;) {
13d6ec91 676 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
677 if (gitfile)
678 gitdirenv = gitfile = xstrdup(gitfile);
679 else {
680 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
681 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
682 }
683
684 if (gitdirenv) {
685 ret = setup_discovered_git_dir(gitdirenv,
686 cwd, offset, len,
687 nongit_ok);
688 free(gitfile);
689 return ret;
690 }
691 free(gitfile);
692
68698da5 693 if (is_git_directory("."))
1cd8031b
NTND
694 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
695
2565b43b
CB
696 offset_parent = offset;
697 while (--offset_parent > ceil_offset && cwd[offset_parent] != '/');
698 if (offset_parent <= ceil_offset)
f161edeb 699 return setup_nongit(cwd, nongit_ok);
8030e442 700 if (one_filesystem) {
2565b43b 701 dev_t parent_device = get_device_or_die("..", cwd, offset);
60c98d1e 702 if (parent_device != current_device) {
8030e442
LD
703 if (nongit_ok) {
704 if (chdir(cwd))
705 die_errno("Cannot come back to cwd");
706 *nongit_ok = 1;
707 return NULL;
708 }
709 cwd[offset] = '\0';
2565b43b 710 die("Not a git repository (or any parent up to mount point %s)\n"
cf87463e 711 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
8030e442
LD
712 }
713 }
502ffe34
LD
714 if (chdir("..")) {
715 cwd[offset] = '\0';
d824cbba 716 die_errno("Cannot change to '%s/..'", cwd);
502ffe34 717 }
2565b43b 718 offset = offset_parent;
892c41b9 719 }
d288a700 720}
5e7bfe25 721
a60645f9
NTND
722const char *setup_git_directory_gently(int *nongit_ok)
723{
724 const char *prefix;
725
726 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f 727 if (prefix)
a6f7f9a3 728 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 729 else
a6f7f9a3 730 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 731
f07d6a1a 732 if (startup_info) {
a60645f9 733 startup_info->have_repository = !nongit_ok || !*nongit_ok;
f07d6a1a
NTND
734 startup_info->prefix = prefix;
735 }
a60645f9
NTND
736 return prefix;
737}
738
94df2506
JH
739int git_config_perm(const char *var, const char *value)
740{
06cbe855
HO
741 int i;
742 char *endptr;
743
744 if (value == NULL)
745 return PERM_GROUP;
746
747 if (!strcmp(value, "umask"))
748 return PERM_UMASK;
749 if (!strcmp(value, "group"))
750 return PERM_GROUP;
751 if (!strcmp(value, "all") ||
752 !strcmp(value, "world") ||
753 !strcmp(value, "everybody"))
754 return PERM_EVERYBODY;
755
756 /* Parse octal numbers */
757 i = strtol(value, &endptr, 8);
758
759 /* If not an octal number, maybe true/false? */
760 if (*endptr != 0)
761 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
762
763 /*
764 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 765 * a chmod value to restrict to.
06cbe855
HO
766 */
767 switch (i) {
768 case PERM_UMASK: /* 0 */
769 return PERM_UMASK;
770 case OLD_PERM_GROUP: /* 1 */
771 return PERM_GROUP;
772 case OLD_PERM_EVERYBODY: /* 2 */
773 return PERM_EVERYBODY;
94df2506 774 }
06cbe855
HO
775
776 /* A filemode value was given: 0xxx */
777
778 if ((i & 0600) != 0600)
779 die("Problem with core.sharedRepository filemode value "
780 "(0%.3o).\nThe owner of files must always have "
781 "read and write permissions.", i);
782
783 /*
784 * Mask filemode value. Others can not get write permission.
785 * x flags for directories are handled separately.
786 */
5a688fe4 787 return -(i & 0666);
94df2506
JH
788}
789
ef90d6d4 790int check_repository_format_version(const char *var, const char *value, void *cb)
ab9cb76f 791{
299726d5
JS
792 if (strcmp(var, "core.repositoryformatversion") == 0)
793 repository_format_version = git_config_int(var, value);
457f06d6 794 else if (strcmp(var, "core.sharedrepository") == 0)
94df2506 795 shared_repository = git_config_perm(var, value);
e90fdc39
JS
796 else if (strcmp(var, "core.bare") == 0) {
797 is_bare_repository_cfg = git_config_bool(var, value);
798 if (is_bare_repository_cfg == 1)
799 inside_work_tree = -1;
800 } else if (strcmp(var, "core.worktree") == 0) {
180483c5
JH
801 if (!value)
802 return config_error_nonbool(var);
8e0f7003 803 free(git_work_tree_cfg);
e90fdc39
JS
804 git_work_tree_cfg = xstrdup(value);
805 inside_work_tree = -1;
806 }
299726d5 807 return 0;
ab9cb76f
JH
808}
809
810int check_repository_format(void)
811{
337e51ce 812 return check_repository_format_gently(get_git_dir(), NULL);
ab9cb76f
JH
813}
814
e1e5ec86
CB
815/*
816 * Returns the "prefix", a path to the current working directory
817 * relative to the work tree root, or NULL, if the current working
818 * directory is not a strict subdirectory of the work tree root. The
819 * prefix always ends with a '/' character.
820 */
5e7bfe25
JH
821const char *setup_git_directory(void)
822{
b3f66fd3 823 return setup_git_directory_gently(NULL);
5e7bfe25 824}
abc06822
FG
825
826const char *resolve_gitdir(const char *suspect)
827{
828 if (is_git_directory(suspect))
829 return suspect;
efc5fb6a 830 return read_gitfile(suspect);
abc06822 831}
1d999ddd
TR
832
833/* if any standard file descriptor is missing open it to /dev/null */
834void sanitize_stdfds(void)
835{
836 int fd = open("/dev/null", O_RDWR, 0);
837 while (fd != -1 && fd < 2)
838 fd = dup(fd);
839 if (fd == -1)
840 die_errno("open /dev/null or dup failed");
841 if (fd > 2)
842 close(fd);
843}