longest_ancestor_length(): use string_list_split()
[git/git.git] / setup.c
CommitLineData
d288a700 1#include "cache.h"
e90fdc39
JS
2#include "dir.h"
3
4static int inside_git_dir = -1;
5static int inside_work_tree = -1;
d288a700 6
546e0fd9 7static char *prefix_path_gently(const char *prefix, int len, const char *path)
d089ebaa
JH
8{
9 const char *orig = path;
18e051a3
CMAB
10 char *sanitized;
11 if (is_absolute_path(orig)) {
e2a57aac 12 const char *temp = real_path(path);
18e051a3
CMAB
13 sanitized = xmalloc(len + strlen(temp) + 1);
14 strcpy(sanitized, temp);
15 } else {
16 sanitized = xmalloc(len + strlen(path) + 1);
d089ebaa
JH
17 if (len)
18 memcpy(sanitized, prefix, len);
19 strcpy(sanitized + len, path);
f332726e 20 }
f3cad0ad 21 if (normalize_path_copy(sanitized, sanitized))
d089ebaa 22 goto error_out;
9a13ba1b 23 if (is_absolute_path(orig)) {
72ec8ba6 24 size_t root_len, len, total;
d089ebaa 25 const char *work_tree = get_git_work_tree();
b3100fd5
JH
26 if (!work_tree)
27 goto error_out;
28 len = strlen(work_tree);
72ec8ba6 29 root_len = offset_1st_component(work_tree);
b3100fd5 30 total = strlen(sanitized) + 1;
d089ebaa 31 if (strncmp(sanitized, work_tree, len) ||
72ec8ba6 32 (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
d089ebaa 33 error_out:
546e0fd9
JK
34 free(sanitized);
35 return NULL;
d089ebaa
JH
36 }
37 if (sanitized[len] == '/')
38 len++;
39 memmove(sanitized, sanitized + len, total - len);
40 }
41 return sanitized;
f332726e
LT
42}
43
546e0fd9
JK
44char *prefix_path(const char *prefix, int len, const char *path)
45{
46 char *r = prefix_path_gently(prefix, len, path);
47 if (!r)
48 die("'%s' is outside repository", path);
49 return r;
50}
51
52int path_inside_repo(const char *prefix, const char *path)
53{
54 int len = prefix ? strlen(prefix) : 0;
55 char *r = prefix_path_gently(prefix, len, path);
56 if (r) {
57 free(r);
58 return 1;
59 }
60 return 0;
61}
62
c6e8c800
JH
63int check_filename(const char *prefix, const char *arg)
64{
65 const char *name;
66 struct stat st;
67
68 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
69 if (!lstat(name, &st))
70 return 1; /* file exists */
71 if (errno == ENOENT || errno == ENOTDIR)
72 return 0; /* file does not exist */
73 die_errno("failed to stat '%s'", arg);
74}
75
023e37c3
MM
76static void NORETURN die_verify_filename(const char *prefix,
77 const char *arg,
78 int diagnose_misspelt_rev)
009fee47 79{
023e37c3
MM
80 if (!diagnose_misspelt_rev)
81 die("%s: no such path in the working tree.\n"
4d4b5739 82 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
023e37c3 83 arg);
0e539dca
JH
84 /*
85 * Saying "'(icase)foo' does not exist in the index" when the
86 * user gave us ":(icase)foo" is just stupid. A magic pathspec
87 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 88 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
89 */
90 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 91 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 92
009fee47
MM
93 /* ... or fall back the most general message. */
94 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
4d4b5739
MM
95 "Use '--' to separate paths from revisions, like this:\n"
96 "'git <command> [<revision>...] -- [<file>...]'", arg);
009fee47
MM
97
98}
99
e23d0b4a
LT
100/*
101 * Verify a filename that we got as an argument for a pathspec
102 * entry. Note that a filename that begins with "-" never verifies
103 * as true, because even if such a filename were to exist, we want
104 * it to be preceded by the "--" marker (or we want the user to
105 * use a format like "./-filename")
023e37c3
MM
106 *
107 * The "diagnose_misspelt_rev" is used to provide a user-friendly
108 * diagnosis when dying upon finding that "name" is not a pathname.
109 * If set to 1, the diagnosis will try to diagnose "name" as an
110 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
111 * will only complain about an inexisting file.
112 *
113 * This function is typically called to check that a "file or rev"
114 * argument is unambiguous. In this case, the caller will want
115 * diagnose_misspelt_rev == 1 when verifying the first non-rev
116 * argument (which could have been a revision), and
117 * diagnose_misspelt_rev == 0 for the next ones (because we already
118 * saw a filename, there's not ambiguity anymore).
e23d0b4a 119 */
023e37c3
MM
120void verify_filename(const char *prefix,
121 const char *arg,
122 int diagnose_misspelt_rev)
e23d0b4a 123{
e23d0b4a
LT
124 if (*arg == '-')
125 die("bad flag '%s' used after filename", arg);
c6e8c800 126 if (check_filename(prefix, arg))
e23d0b4a 127 return;
023e37c3 128 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
129}
130
ea92f41f
JH
131/*
132 * Opposite of the above: the command line did not have -- marker
133 * and we parsed the arg as a refname. It should not be interpretable
134 * as a filename.
135 */
136void verify_non_filename(const char *prefix, const char *arg)
137{
7ae3df8c 138 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 139 return;
ea92f41f
JH
140 if (*arg == '-')
141 return; /* flag */
c6e8c800
JH
142 if (!check_filename(prefix, arg))
143 return;
144 die("ambiguous argument '%s': both revision and filename\n"
4d4b5739
MM
145 "Use '--' to separate paths from revisions, like this:\n"
146 "'git <command> [<revision>...] -- [<file>...]'", arg);
ea92f41f
JH
147}
148
8a42c985
JH
149/*
150 * Magic pathspec
151 *
152 * NEEDSWORK: These need to be moved to dir.h or even to a new
153 * pathspec.h when we restructure get_pathspec() users to use the
154 * "struct pathspec" interface.
155 *
156 * Possible future magic semantics include stuff like:
157 *
158 * { PATHSPEC_NOGLOB, '!', "noglob" },
6d942927 159 * { PATHSPEC_ICASE, '\0', "icase" },
8a42c985
JH
160 * { PATHSPEC_RECURSIVE, '*', "recursive" },
161 * { PATHSPEC_REGEXP, '\0', "regexp" },
162 *
163 */
164#define PATHSPEC_FROMTOP (1<<0)
165
488201c8 166static struct pathspec_magic {
8a42c985
JH
167 unsigned bit;
168 char mnemonic; /* this cannot be ':'! */
169 const char *name;
170} pathspec_magic[] = {
171 { PATHSPEC_FROMTOP, '/', "top" },
172};
173
174/*
175 * Take an element of a pathspec and check for magic signatures.
176 * Append the result to the prefix.
177 *
178 * For now, we only parse the syntax and throw out anything other than
179 * "top" magic.
180 *
181 * NEEDSWORK: This needs to be rewritten when we start migrating
182 * get_pathspec() users to use the "struct pathspec" interface. For
183 * example, a pathspec element may be marked as case-insensitive, but
184 * the prefix part must always match literally, and a single stupid
185 * string cannot express such a case.
186 */
488201c8 187static const char *prefix_pathspec(const char *prefix, int prefixlen, const char *elt)
8a42c985
JH
188{
189 unsigned magic = 0;
190 const char *copyfrom = elt;
6d942927 191 int i;
8a42c985
JH
192
193 if (elt[0] != ':') {
194 ; /* nothing to do */
195 } else if (elt[1] == '(') {
196 /* longhand */
197 const char *nextat;
198 for (copyfrom = elt + 2;
199 *copyfrom && *copyfrom != ')';
200 copyfrom = nextat) {
201 size_t len = strcspn(copyfrom, ",)");
202 if (copyfrom[len] == ')')
203 nextat = copyfrom + len;
204 else
205 nextat = copyfrom + len + 1;
206 if (!len)
207 continue;
208 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
209 if (strlen(pathspec_magic[i].name) == len &&
210 !strncmp(pathspec_magic[i].name, copyfrom, len)) {
211 magic |= pathspec_magic[i].bit;
212 break;
213 }
214 if (ARRAY_SIZE(pathspec_magic) <= i)
215 die("Invalid pathspec magic '%.*s' in '%s'",
216 (int) len, copyfrom, elt);
217 }
218 if (*copyfrom == ')')
219 copyfrom++;
220 } else {
221 /* shorthand */
222 for (copyfrom = elt + 1;
223 *copyfrom && *copyfrom != ':';
224 copyfrom++) {
225 char ch = *copyfrom;
2f6c9760
JH
226
227 if (!is_pathspec_magic(ch))
228 break;
8a42c985
JH
229 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
230 if (pathspec_magic[i].mnemonic == ch) {
231 magic |= pathspec_magic[i].bit;
232 break;
233 }
234 if (ARRAY_SIZE(pathspec_magic) <= i)
2f6c9760
JH
235 die("Unimplemented pathspec magic '%c' in '%s'",
236 ch, elt);
8a42c985
JH
237 }
238 if (*copyfrom == ':')
239 copyfrom++;
240 }
241
242 if (magic & PATHSPEC_FROMTOP)
6d942927 243 return xstrdup(copyfrom);
8a42c985 244 else
6d942927 245 return prefix_path(prefix, prefixlen, copyfrom);
8a42c985
JH
246}
247
6b5ee137 248const char **get_pathspec(const char *prefix, const char **pathspec)
d288a700 249{
6b5ee137 250 const char *entry = *pathspec;
d089ebaa 251 const char **src, **dst;
d288a700
LT
252 int prefixlen;
253
f332726e
LT
254 if (!prefix && !entry)
255 return NULL;
d288a700
LT
256
257 if (!entry) {
258 static const char *spec[2];
259 spec[0] = prefix;
260 spec[1] = NULL;
261 return spec;
262 }
263
264 /* Otherwise we have to re-write the entries.. */
d089ebaa
JH
265 src = pathspec;
266 dst = pathspec;
f332726e 267 prefixlen = prefix ? strlen(prefix) : 0;
d089ebaa 268 while (*src) {
8a42c985 269 *(dst++) = prefix_pathspec(prefix, prefixlen, *src);
d089ebaa
JH
270 src++;
271 }
272 *dst = NULL;
273 if (!*pathspec)
274 return NULL;
275 return pathspec;
d288a700
LT
276}
277
5f5608bc 278/*
ad1a382f 279 * Test if it looks like we're at a git directory.
5e7bfe25 280 * We want to see:
5f5608bc 281 *
790296fd 282 * - either an objects/ directory _or_ the proper
5f5608bc 283 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 284 * - a refs/ directory
8098a178 285 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
286 * a proper "ref:", or a regular file HEAD that has a properly
287 * formatted sha1 object name.
5f5608bc 288 */
b3256eb8 289int is_git_directory(const char *suspect)
5f5608bc 290{
ad1a382f
SP
291 char path[PATH_MAX];
292 size_t len = strlen(suspect);
293
3c9d0414
GB
294 if (PATH_MAX <= len + strlen("/objects"))
295 die("Too long path: %.*s", 60, suspect);
ad1a382f
SP
296 strcpy(path, suspect);
297 if (getenv(DB_ENVIRONMENT)) {
298 if (access(getenv(DB_ENVIRONMENT), X_OK))
299 return 0;
300 }
301 else {
302 strcpy(path + len, "/objects");
303 if (access(path, X_OK))
304 return 0;
305 }
306
307 strcpy(path + len, "/refs");
308 if (access(path, X_OK))
8098a178 309 return 0;
ad1a382f
SP
310
311 strcpy(path + len, "/HEAD");
c847f537 312 if (validate_headref(path))
ad1a382f
SP
313 return 0;
314
8098a178 315 return 1;
5f5608bc
LT
316}
317
68025633
JS
318int is_inside_git_dir(void)
319{
e90fdc39
JS
320 if (inside_git_dir < 0)
321 inside_git_dir = is_inside_dir(get_git_dir());
322 return inside_git_dir;
892c41b9
ML
323}
324
892c41b9
ML
325int is_inside_work_tree(void)
326{
e90fdc39
JS
327 if (inside_work_tree < 0)
328 inside_work_tree = is_inside_dir(get_git_work_tree());
329 return inside_work_tree;
892c41b9
ML
330}
331
f3fa1838
JH
332void setup_work_tree(void)
333{
354e6534
JS
334 const char *work_tree, *git_dir;
335 static int initialized = 0;
336
337 if (initialized)
338 return;
339 work_tree = get_git_work_tree();
340 git_dir = get_git_dir();
59f0f2f3 341 if (!is_absolute_path(git_dir))
e2a57aac 342 git_dir = real_path(get_git_dir());
59f0f2f3
MH
343 if (!work_tree || chdir(work_tree))
344 die("This operation must be run in a work tree");
0ed74813
NTND
345
346 /*
347 * Make sure subsequent git processes find correct worktree
348 * if $GIT_WORK_TREE is set relative
349 */
350 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
351 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
352
e2a57aac 353 set_git_dir(relative_path(git_dir, work_tree));
354e6534 354 initialized = 1;
59f0f2f3
MH
355}
356
337e51ce 357static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 358{
337e51ce
NTND
359 char repo_config[PATH_MAX+1];
360
361 /*
362 * git_config() can't be used here because it calls git_pathdup()
363 * to get $GIT_CONFIG/config. That call will make setup_git_env()
364 * set git_dir to ".git".
365 *
366 * We are in gitdir setup, no git dir has been found useable yet.
367 * Use a gentler version of git_config() to check if this repo
368 * is a good one.
369 */
370 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
371 git_config_early(check_repository_format_version, NULL, repo_config);
9459aa77
NTND
372 if (GIT_REPO_VERSION < repository_format_version) {
373 if (!nongit_ok)
374 die ("Expected git repo version <= %d, found %d",
375 GIT_REPO_VERSION, repository_format_version);
376 warning("Expected git repo version <= %d, found %d",
377 GIT_REPO_VERSION, repository_format_version);
378 warning("Please upgrade Git");
379 *nongit_ok = -1;
380 return -1;
381 }
382 return 0;
383}
384
b44ebb19
LH
385/*
386 * Try to read the location of the git directory from the .git file,
387 * return path to git directory if found.
388 */
13d6ec91 389const char *read_gitfile(const char *path)
b44ebb19
LH
390{
391 char *buf;
40c813e0
BK
392 char *dir;
393 const char *slash;
b44ebb19
LH
394 struct stat st;
395 int fd;
b1905aea 396 ssize_t len;
b44ebb19
LH
397
398 if (stat(path, &st))
399 return NULL;
400 if (!S_ISREG(st.st_mode))
401 return NULL;
402 fd = open(path, O_RDONLY);
403 if (fd < 0)
d824cbba 404 die_errno("Error opening '%s'", path);
b44ebb19
LH
405 buf = xmalloc(st.st_size + 1);
406 len = read_in_full(fd, buf, st.st_size);
407 close(fd);
408 if (len != st.st_size)
409 die("Error reading %s", path);
410 buf[len] = '\0';
411 if (prefixcmp(buf, "gitdir: "))
412 die("Invalid gitfile format: %s", path);
413 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
414 len--;
415 if (len < 9)
416 die("No path in gitfile: %s", path);
417 buf[len] = '\0';
40c813e0
BK
418 dir = buf + 8;
419
420 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
421 size_t pathlen = slash+1 - path;
422 size_t dirlen = pathlen + len - 8;
423 dir = xmalloc(dirlen + 1);
424 strncpy(dir, path, pathlen);
425 strncpy(dir + pathlen, buf + 8, len - 8);
426 dir[dirlen] = '\0';
427 free(buf);
428 buf = dir;
429 }
430
431 if (!is_git_directory(dir))
432 die("Not a git repository: %s", dir);
e2a57aac 433 path = real_path(dir);
40c813e0 434
b44ebb19
LH
435 free(buf);
436 return path;
437}
438
e4e30347 439static const char *setup_explicit_git_dir(const char *gitdirenv,
b3f66fd3
NTND
440 char *cwd, int len,
441 int *nongit_ok)
e4e30347 442{
b3f66fd3
NTND
443 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
444 const char *worktree;
445 char *gitfile;
9b125da4 446 int offset;
e4e30347
JN
447
448 if (PATH_MAX - 40 < strlen(gitdirenv))
449 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 450
13d6ec91 451 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
452 if (gitfile) {
453 gitfile = xstrdup(gitfile);
454 gitdirenv = gitfile;
455 }
456
e4e30347
JN
457 if (!is_git_directory(gitdirenv)) {
458 if (nongit_ok) {
459 *nongit_ok = 1;
b3f66fd3 460 free(gitfile);
e4e30347
JN
461 return NULL;
462 }
463 die("Not a git repository: '%s'", gitdirenv);
464 }
b3f66fd3
NTND
465
466 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
467 free(gitfile);
468 return NULL;
e4e30347 469 }
b3f66fd3
NTND
470
471 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
472 if (work_tree_env)
473 set_git_work_tree(work_tree_env);
474 else if (is_bare_repository_cfg > 0) {
475 if (git_work_tree_cfg) /* #22.2, #30 */
476 die("core.bare and core.worktree do not make sense");
477
478 /* #18, #26 */
479 set_git_dir(gitdirenv);
480 free(gitfile);
e4e30347 481 return NULL;
b3f66fd3
NTND
482 }
483 else if (git_work_tree_cfg) { /* #6, #14 */
484 if (is_absolute_path(git_work_tree_cfg))
485 set_git_work_tree(git_work_tree_cfg);
486 else {
487 char core_worktree[PATH_MAX];
488 if (chdir(gitdirenv))
489 die_errno("Could not chdir to '%s'", gitdirenv);
490 if (chdir(git_work_tree_cfg))
491 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
492 if (!getcwd(core_worktree, PATH_MAX))
493 die_errno("Could not get directory '%s'", git_work_tree_cfg);
494 if (chdir(cwd))
495 die_errno("Could not come back to cwd");
496 set_git_work_tree(core_worktree);
497 }
498 }
499 else /* #2, #10 */
500 set_git_work_tree(".");
501
502 /* set_git_work_tree() must have been called by now */
503 worktree = get_git_work_tree();
504
505 /* both get_git_work_tree() and cwd are already normalized */
506 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
507 set_git_dir(gitdirenv);
508 free(gitfile);
e4e30347 509 return NULL;
b3f66fd3 510 }
e4e30347 511
9b125da4
NTND
512 offset = dir_inside_of(cwd, worktree);
513 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 514 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
515 if (chdir(worktree))
516 die_errno("Could not chdir to '%s'", worktree);
517 cwd[len++] = '/';
518 cwd[len] = '\0';
519 free(gitfile);
9b125da4 520 return cwd + offset;
93a00542 521 }
b3f66fd3
NTND
522
523 /* cwd outside worktree */
524 set_git_dir(gitdirenv);
525 free(gitfile);
526 return NULL;
93a00542
JN
527}
528
9951d3b3
NTND
529static const char *setup_discovered_git_dir(const char *gitdir,
530 char *cwd, int offset, int len,
531 int *nongit_ok)
98937bef 532{
9951d3b3
NTND
533 if (check_repository_format_gently(gitdir, nongit_ok))
534 return NULL;
98937bef 535
4868b2ea
JN
536 /* --work-tree is set without --git-dir; use discovered one */
537 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
538 if (offset != len && !is_absolute_path(gitdir))
e2a57aac 539 gitdir = xstrdup(real_path(gitdir));
4868b2ea
JN
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
9951d3b3
NTND
545 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
546 if (is_bare_repository_cfg > 0) {
e2a57aac 547 set_git_dir(offset == len ? gitdir : real_path(gitdir));
9951d3b3
NTND
548 if (chdir(cwd))
549 die_errno("Could not come back to cwd");
98937bef 550 return NULL;
9951d3b3 551 }
98937bef 552
9951d3b3
NTND
553 /* #0, #1, #5, #8, #9, #12, #13 */
554 set_git_work_tree(".");
555 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
556 set_git_dir(gitdir);
98937bef 557 inside_git_dir = 0;
9951d3b3 558 inside_work_tree = 1;
98937bef
NTND
559 if (offset == len)
560 return NULL;
561
562 /* Make "offset" point to past the '/', and add a '/' at the end */
563 offset++;
564 cwd[len++] = '/';
565 cwd[len] = 0;
566 return cwd + offset;
567}
568
1cd8031b
NTND
569/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
570static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
68698da5
JN
571{
572 int root_len;
573
1cd8031b
NTND
574 if (check_repository_format_gently(".", nongit_ok))
575 return NULL;
576
4868b2ea
JN
577 /* --work-tree is set without --git-dir; use discovered one */
578 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
579 const char *gitdir;
580
581 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
582 if (chdir(cwd))
583 die_errno("Could not come back to cwd");
584 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
585 }
586
68698da5 587 inside_git_dir = 1;
1cd8031b 588 inside_work_tree = 0;
68698da5 589 if (offset != len) {
8fc0ae80
NTND
590 if (chdir(cwd))
591 die_errno("Cannot come back to cwd");
68698da5
JN
592 root_len = offset_1st_component(cwd);
593 cwd[offset > root_len ? offset : root_len] = '\0';
594 set_git_dir(cwd);
337e51ce 595 }
1cd8031b 596 else
68698da5 597 set_git_dir(".");
68698da5
JN
598 return NULL;
599}
600
f161edeb
JN
601static const char *setup_nongit(const char *cwd, int *nongit_ok)
602{
603 if (!nongit_ok)
604 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
605 if (chdir(cwd))
606 die_errno("Cannot come back to cwd");
607 *nongit_ok = 1;
608 return NULL;
609}
610
2565b43b 611static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
612{
613 struct stat buf;
2565b43b
CB
614 if (stat(path, &buf)) {
615 die_errno("failed to stat '%*s%s%s'",
616 prefix_len,
60c98d1e
JN
617 prefix ? prefix : "",
618 prefix ? "/" : "", path);
2565b43b 619 }
60c98d1e
JN
620 return buf.st_dev;
621}
622
e90fdc39
JS
623/*
624 * We cannot decide in this function whether we are in the work tree or
625 * not, since the config can only be read _after_ this function was called.
626 */
a60645f9 627static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 628{
0454dd93 629 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
d288a700 630 static char cwd[PATH_MAX+1];
9951d3b3
NTND
631 const char *gitdirenv, *ret;
632 char *gitfile;
2565b43b 633 int len, offset, offset_parent, ceil_offset;
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
b3f66fd3
NTND
645 if (!getcwd(cwd, sizeof(cwd)-1))
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
0454dd93 658 ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
17d778e7
JH
659 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
660 ceil_offset = 1;
d288a700 661
892c41b9 662 /*
e90fdc39 663 * Test in the following order (relative to the cwd):
b44ebb19 664 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
665 * - .git/
666 * - ./ (bare)
b44ebb19 667 * - ../.git
e90fdc39
JS
668 * - ../.git/
669 * - ../ (bare)
670 * - ../../.git/
671 * etc.
892c41b9 672 */
cf87463e 673 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 674 if (one_filesystem)
2565b43b 675 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 676 for (;;) {
13d6ec91 677 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
678 if (gitfile)
679 gitdirenv = gitfile = xstrdup(gitfile);
680 else {
681 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
682 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
683 }
684
685 if (gitdirenv) {
686 ret = setup_discovered_git_dir(gitdirenv,
687 cwd, offset, len,
688 nongit_ok);
689 free(gitfile);
690 return ret;
691 }
692 free(gitfile);
693
68698da5 694 if (is_git_directory("."))
1cd8031b
NTND
695 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
696
2565b43b
CB
697 offset_parent = offset;
698 while (--offset_parent > ceil_offset && cwd[offset_parent] != '/');
699 if (offset_parent <= ceil_offset)
f161edeb 700 return setup_nongit(cwd, nongit_ok);
8030e442 701 if (one_filesystem) {
2565b43b 702 dev_t parent_device = get_device_or_die("..", cwd, offset);
60c98d1e 703 if (parent_device != current_device) {
8030e442
LD
704 if (nongit_ok) {
705 if (chdir(cwd))
706 die_errno("Cannot come back to cwd");
707 *nongit_ok = 1;
708 return NULL;
709 }
710 cwd[offset] = '\0';
2565b43b 711 die("Not a git repository (or any parent up to mount point %s)\n"
cf87463e 712 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
8030e442
LD
713 }
714 }
502ffe34
LD
715 if (chdir("..")) {
716 cwd[offset] = '\0';
d824cbba 717 die_errno("Cannot change to '%s/..'", cwd);
502ffe34 718 }
2565b43b 719 offset = offset_parent;
892c41b9 720 }
d288a700 721}
5e7bfe25 722
a60645f9
NTND
723const char *setup_git_directory_gently(int *nongit_ok)
724{
725 const char *prefix;
726
727 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f
DA
728 if (prefix)
729 setenv("GIT_PREFIX", prefix, 1);
730 else
731 setenv("GIT_PREFIX", "", 1);
732
f07d6a1a 733 if (startup_info) {
a60645f9 734 startup_info->have_repository = !nongit_ok || !*nongit_ok;
f07d6a1a
NTND
735 startup_info->prefix = prefix;
736 }
a60645f9
NTND
737 return prefix;
738}
739
94df2506
JH
740int git_config_perm(const char *var, const char *value)
741{
06cbe855
HO
742 int i;
743 char *endptr;
744
745 if (value == NULL)
746 return PERM_GROUP;
747
748 if (!strcmp(value, "umask"))
749 return PERM_UMASK;
750 if (!strcmp(value, "group"))
751 return PERM_GROUP;
752 if (!strcmp(value, "all") ||
753 !strcmp(value, "world") ||
754 !strcmp(value, "everybody"))
755 return PERM_EVERYBODY;
756
757 /* Parse octal numbers */
758 i = strtol(value, &endptr, 8);
759
760 /* If not an octal number, maybe true/false? */
761 if (*endptr != 0)
762 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
763
764 /*
765 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 766 * a chmod value to restrict to.
06cbe855
HO
767 */
768 switch (i) {
769 case PERM_UMASK: /* 0 */
770 return PERM_UMASK;
771 case OLD_PERM_GROUP: /* 1 */
772 return PERM_GROUP;
773 case OLD_PERM_EVERYBODY: /* 2 */
774 return PERM_EVERYBODY;
94df2506 775 }
06cbe855
HO
776
777 /* A filemode value was given: 0xxx */
778
779 if ((i & 0600) != 0600)
780 die("Problem with core.sharedRepository filemode value "
781 "(0%.3o).\nThe owner of files must always have "
782 "read and write permissions.", i);
783
784 /*
785 * Mask filemode value. Others can not get write permission.
786 * x flags for directories are handled separately.
787 */
5a688fe4 788 return -(i & 0666);
94df2506
JH
789}
790
ef90d6d4 791int check_repository_format_version(const char *var, const char *value, void *cb)
ab9cb76f 792{
299726d5
JS
793 if (strcmp(var, "core.repositoryformatversion") == 0)
794 repository_format_version = git_config_int(var, value);
457f06d6 795 else if (strcmp(var, "core.sharedrepository") == 0)
94df2506 796 shared_repository = git_config_perm(var, value);
e90fdc39
JS
797 else if (strcmp(var, "core.bare") == 0) {
798 is_bare_repository_cfg = git_config_bool(var, value);
799 if (is_bare_repository_cfg == 1)
800 inside_work_tree = -1;
801 } else if (strcmp(var, "core.worktree") == 0) {
180483c5
JH
802 if (!value)
803 return config_error_nonbool(var);
8e0f7003 804 free(git_work_tree_cfg);
e90fdc39
JS
805 git_work_tree_cfg = xstrdup(value);
806 inside_work_tree = -1;
807 }
299726d5 808 return 0;
ab9cb76f
JH
809}
810
811int check_repository_format(void)
812{
337e51ce 813 return check_repository_format_gently(get_git_dir(), NULL);
ab9cb76f
JH
814}
815
e1e5ec86
CB
816/*
817 * Returns the "prefix", a path to the current working directory
818 * relative to the work tree root, or NULL, if the current working
819 * directory is not a strict subdirectory of the work tree root. The
820 * prefix always ends with a '/' character.
821 */
5e7bfe25
JH
822const char *setup_git_directory(void)
823{
b3f66fd3 824 return setup_git_directory_gently(NULL);
5e7bfe25 825}
abc06822
FG
826
827const char *resolve_gitdir(const char *suspect)
828{
829 if (is_git_directory(suspect))
830 return suspect;
efc5fb6a 831 return read_gitfile(suspect);
abc06822 832}