Git 1.7.11.4
[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
MM
79{
80 unsigned char sha1[20];
81 unsigned mode;
0e539dca 82
023e37c3
MM
83 if (!diagnose_misspelt_rev)
84 die("%s: no such path in the working tree.\n"
85 "Use '-- <path>...' to specify paths that do not exist locally.",
86 arg);
0e539dca
JH
87 /*
88 * Saying "'(icase)foo' does not exist in the index" when the
89 * user gave us ":(icase)foo" is just stupid. A magic pathspec
90 * begins with a colon and is followed by a non-alnum; do not
91 * let get_sha1_with_mode_1(only_to_die=1) to even trigger.
92 */
93 if (!(arg[0] == ':' && !isalnum(arg[1])))
94 /* try a detailed diagnostic ... */
95 get_sha1_with_mode_1(arg, sha1, &mode, 1, prefix);
96
009fee47
MM
97 /* ... or fall back the most general message. */
98 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
99 "Use '--' to separate paths from revisions", arg);
100
101}
102
e23d0b4a
LT
103/*
104 * Verify a filename that we got as an argument for a pathspec
105 * entry. Note that a filename that begins with "-" never verifies
106 * as true, because even if such a filename were to exist, we want
107 * it to be preceded by the "--" marker (or we want the user to
108 * use a format like "./-filename")
023e37c3
MM
109 *
110 * The "diagnose_misspelt_rev" is used to provide a user-friendly
111 * diagnosis when dying upon finding that "name" is not a pathname.
112 * If set to 1, the diagnosis will try to diagnose "name" as an
113 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
114 * will only complain about an inexisting file.
115 *
116 * This function is typically called to check that a "file or rev"
117 * argument is unambiguous. In this case, the caller will want
118 * diagnose_misspelt_rev == 1 when verifying the first non-rev
119 * argument (which could have been a revision), and
120 * diagnose_misspelt_rev == 0 for the next ones (because we already
121 * saw a filename, there's not ambiguity anymore).
e23d0b4a 122 */
023e37c3
MM
123void verify_filename(const char *prefix,
124 const char *arg,
125 int diagnose_misspelt_rev)
e23d0b4a 126{
e23d0b4a
LT
127 if (*arg == '-')
128 die("bad flag '%s' used after filename", arg);
c6e8c800 129 if (check_filename(prefix, arg))
e23d0b4a 130 return;
023e37c3 131 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
132}
133
ea92f41f
JH
134/*
135 * Opposite of the above: the command line did not have -- marker
136 * and we parsed the arg as a refname. It should not be interpretable
137 * as a filename.
138 */
139void verify_non_filename(const char *prefix, const char *arg)
140{
7ae3df8c 141 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 142 return;
ea92f41f
JH
143 if (*arg == '-')
144 return; /* flag */
c6e8c800
JH
145 if (!check_filename(prefix, arg))
146 return;
147 die("ambiguous argument '%s': both revision and filename\n"
148 "Use '--' to separate filenames from revisions", arg);
ea92f41f
JH
149}
150
8a42c985
JH
151/*
152 * Magic pathspec
153 *
154 * NEEDSWORK: These need to be moved to dir.h or even to a new
155 * pathspec.h when we restructure get_pathspec() users to use the
156 * "struct pathspec" interface.
157 *
158 * Possible future magic semantics include stuff like:
159 *
160 * { PATHSPEC_NOGLOB, '!', "noglob" },
6d942927 161 * { PATHSPEC_ICASE, '\0', "icase" },
8a42c985
JH
162 * { PATHSPEC_RECURSIVE, '*', "recursive" },
163 * { PATHSPEC_REGEXP, '\0', "regexp" },
164 *
165 */
166#define PATHSPEC_FROMTOP (1<<0)
167
488201c8 168static struct pathspec_magic {
8a42c985
JH
169 unsigned bit;
170 char mnemonic; /* this cannot be ':'! */
171 const char *name;
172} pathspec_magic[] = {
173 { PATHSPEC_FROMTOP, '/', "top" },
174};
175
176/*
177 * Take an element of a pathspec and check for magic signatures.
178 * Append the result to the prefix.
179 *
180 * For now, we only parse the syntax and throw out anything other than
181 * "top" magic.
182 *
183 * NEEDSWORK: This needs to be rewritten when we start migrating
184 * get_pathspec() users to use the "struct pathspec" interface. For
185 * example, a pathspec element may be marked as case-insensitive, but
186 * the prefix part must always match literally, and a single stupid
187 * string cannot express such a case.
188 */
488201c8 189static const char *prefix_pathspec(const char *prefix, int prefixlen, const char *elt)
8a42c985
JH
190{
191 unsigned magic = 0;
192 const char *copyfrom = elt;
6d942927 193 int i;
8a42c985
JH
194
195 if (elt[0] != ':') {
196 ; /* nothing to do */
197 } else if (elt[1] == '(') {
198 /* longhand */
199 const char *nextat;
200 for (copyfrom = elt + 2;
201 *copyfrom && *copyfrom != ')';
202 copyfrom = nextat) {
203 size_t len = strcspn(copyfrom, ",)");
204 if (copyfrom[len] == ')')
205 nextat = copyfrom + len;
206 else
207 nextat = copyfrom + len + 1;
208 if (!len)
209 continue;
210 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
211 if (strlen(pathspec_magic[i].name) == len &&
212 !strncmp(pathspec_magic[i].name, copyfrom, len)) {
213 magic |= pathspec_magic[i].bit;
214 break;
215 }
216 if (ARRAY_SIZE(pathspec_magic) <= i)
217 die("Invalid pathspec magic '%.*s' in '%s'",
218 (int) len, copyfrom, elt);
219 }
220 if (*copyfrom == ')')
221 copyfrom++;
222 } else {
223 /* shorthand */
224 for (copyfrom = elt + 1;
225 *copyfrom && *copyfrom != ':';
226 copyfrom++) {
227 char ch = *copyfrom;
2f6c9760
JH
228
229 if (!is_pathspec_magic(ch))
230 break;
8a42c985
JH
231 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
232 if (pathspec_magic[i].mnemonic == ch) {
233 magic |= pathspec_magic[i].bit;
234 break;
235 }
236 if (ARRAY_SIZE(pathspec_magic) <= i)
2f6c9760
JH
237 die("Unimplemented pathspec magic '%c' in '%s'",
238 ch, elt);
8a42c985
JH
239 }
240 if (*copyfrom == ':')
241 copyfrom++;
242 }
243
244 if (magic & PATHSPEC_FROMTOP)
6d942927 245 return xstrdup(copyfrom);
8a42c985 246 else
6d942927 247 return prefix_path(prefix, prefixlen, copyfrom);
8a42c985
JH
248}
249
6b5ee137 250const char **get_pathspec(const char *prefix, const char **pathspec)
d288a700 251{
6b5ee137 252 const char *entry = *pathspec;
d089ebaa 253 const char **src, **dst;
d288a700
LT
254 int prefixlen;
255
f332726e
LT
256 if (!prefix && !entry)
257 return NULL;
d288a700
LT
258
259 if (!entry) {
260 static const char *spec[2];
261 spec[0] = prefix;
262 spec[1] = NULL;
263 return spec;
264 }
265
266 /* Otherwise we have to re-write the entries.. */
d089ebaa
JH
267 src = pathspec;
268 dst = pathspec;
f332726e 269 prefixlen = prefix ? strlen(prefix) : 0;
d089ebaa 270 while (*src) {
8a42c985 271 *(dst++) = prefix_pathspec(prefix, prefixlen, *src);
d089ebaa
JH
272 src++;
273 }
274 *dst = NULL;
275 if (!*pathspec)
276 return NULL;
277 return pathspec;
d288a700
LT
278}
279
5f5608bc 280/*
ad1a382f 281 * Test if it looks like we're at a git directory.
5e7bfe25 282 * We want to see:
5f5608bc 283 *
790296fd 284 * - either an objects/ directory _or_ the proper
5f5608bc 285 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 286 * - a refs/ directory
8098a178 287 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
288 * a proper "ref:", or a regular file HEAD that has a properly
289 * formatted sha1 object name.
5f5608bc 290 */
b3256eb8 291int is_git_directory(const char *suspect)
5f5608bc 292{
ad1a382f
SP
293 char path[PATH_MAX];
294 size_t len = strlen(suspect);
295
3c9d0414
GB
296 if (PATH_MAX <= len + strlen("/objects"))
297 die("Too long path: %.*s", 60, suspect);
ad1a382f
SP
298 strcpy(path, suspect);
299 if (getenv(DB_ENVIRONMENT)) {
300 if (access(getenv(DB_ENVIRONMENT), X_OK))
301 return 0;
302 }
303 else {
304 strcpy(path + len, "/objects");
305 if (access(path, X_OK))
306 return 0;
307 }
308
309 strcpy(path + len, "/refs");
310 if (access(path, X_OK))
8098a178 311 return 0;
ad1a382f
SP
312
313 strcpy(path + len, "/HEAD");
c847f537 314 if (validate_headref(path))
ad1a382f
SP
315 return 0;
316
8098a178 317 return 1;
5f5608bc
LT
318}
319
68025633
JS
320int is_inside_git_dir(void)
321{
e90fdc39
JS
322 if (inside_git_dir < 0)
323 inside_git_dir = is_inside_dir(get_git_dir());
324 return inside_git_dir;
892c41b9
ML
325}
326
892c41b9
ML
327int is_inside_work_tree(void)
328{
e90fdc39
JS
329 if (inside_work_tree < 0)
330 inside_work_tree = is_inside_dir(get_git_work_tree());
331 return inside_work_tree;
892c41b9
ML
332}
333
f3fa1838
JH
334void setup_work_tree(void)
335{
354e6534
JS
336 const char *work_tree, *git_dir;
337 static int initialized = 0;
338
339 if (initialized)
340 return;
341 work_tree = get_git_work_tree();
342 git_dir = get_git_dir();
59f0f2f3 343 if (!is_absolute_path(git_dir))
e2a57aac 344 git_dir = real_path(get_git_dir());
59f0f2f3
MH
345 if (!work_tree || chdir(work_tree))
346 die("This operation must be run in a work tree");
0ed74813
NTND
347
348 /*
349 * Make sure subsequent git processes find correct worktree
350 * if $GIT_WORK_TREE is set relative
351 */
352 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
353 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
354
e2a57aac 355 set_git_dir(relative_path(git_dir, work_tree));
354e6534 356 initialized = 1;
59f0f2f3
MH
357}
358
337e51ce 359static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 360{
337e51ce
NTND
361 char repo_config[PATH_MAX+1];
362
363 /*
364 * git_config() can't be used here because it calls git_pathdup()
365 * to get $GIT_CONFIG/config. That call will make setup_git_env()
366 * set git_dir to ".git".
367 *
368 * We are in gitdir setup, no git dir has been found useable yet.
369 * Use a gentler version of git_config() to check if this repo
370 * is a good one.
371 */
372 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
373 git_config_early(check_repository_format_version, NULL, repo_config);
9459aa77
NTND
374 if (GIT_REPO_VERSION < repository_format_version) {
375 if (!nongit_ok)
376 die ("Expected git repo version <= %d, found %d",
377 GIT_REPO_VERSION, repository_format_version);
378 warning("Expected git repo version <= %d, found %d",
379 GIT_REPO_VERSION, repository_format_version);
380 warning("Please upgrade Git");
381 *nongit_ok = -1;
382 return -1;
383 }
384 return 0;
385}
386
b44ebb19
LH
387/*
388 * Try to read the location of the git directory from the .git file,
389 * return path to git directory if found.
390 */
13d6ec91 391const char *read_gitfile(const char *path)
b44ebb19
LH
392{
393 char *buf;
40c813e0
BK
394 char *dir;
395 const char *slash;
b44ebb19
LH
396 struct stat st;
397 int fd;
b1905aea 398 ssize_t len;
b44ebb19
LH
399
400 if (stat(path, &st))
401 return NULL;
402 if (!S_ISREG(st.st_mode))
403 return NULL;
404 fd = open(path, O_RDONLY);
405 if (fd < 0)
d824cbba 406 die_errno("Error opening '%s'", path);
b44ebb19
LH
407 buf = xmalloc(st.st_size + 1);
408 len = read_in_full(fd, buf, st.st_size);
409 close(fd);
410 if (len != st.st_size)
411 die("Error reading %s", path);
412 buf[len] = '\0';
413 if (prefixcmp(buf, "gitdir: "))
414 die("Invalid gitfile format: %s", path);
415 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
416 len--;
417 if (len < 9)
418 die("No path in gitfile: %s", path);
419 buf[len] = '\0';
40c813e0
BK
420 dir = buf + 8;
421
422 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
423 size_t pathlen = slash+1 - path;
424 size_t dirlen = pathlen + len - 8;
425 dir = xmalloc(dirlen + 1);
426 strncpy(dir, path, pathlen);
427 strncpy(dir + pathlen, buf + 8, len - 8);
428 dir[dirlen] = '\0';
429 free(buf);
430 buf = dir;
431 }
432
433 if (!is_git_directory(dir))
434 die("Not a git repository: %s", dir);
e2a57aac 435 path = real_path(dir);
40c813e0 436
b44ebb19
LH
437 free(buf);
438 return path;
439}
440
e4e30347 441static const char *setup_explicit_git_dir(const char *gitdirenv,
b3f66fd3
NTND
442 char *cwd, int len,
443 int *nongit_ok)
e4e30347 444{
b3f66fd3
NTND
445 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
446 const char *worktree;
447 char *gitfile;
9b125da4 448 int offset;
e4e30347
JN
449
450 if (PATH_MAX - 40 < strlen(gitdirenv))
451 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 452
13d6ec91 453 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
454 if (gitfile) {
455 gitfile = xstrdup(gitfile);
456 gitdirenv = gitfile;
457 }
458
e4e30347
JN
459 if (!is_git_directory(gitdirenv)) {
460 if (nongit_ok) {
461 *nongit_ok = 1;
b3f66fd3 462 free(gitfile);
e4e30347
JN
463 return NULL;
464 }
465 die("Not a git repository: '%s'", gitdirenv);
466 }
b3f66fd3
NTND
467
468 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
469 free(gitfile);
470 return NULL;
e4e30347 471 }
b3f66fd3
NTND
472
473 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
474 if (work_tree_env)
475 set_git_work_tree(work_tree_env);
476 else if (is_bare_repository_cfg > 0) {
477 if (git_work_tree_cfg) /* #22.2, #30 */
478 die("core.bare and core.worktree do not make sense");
479
480 /* #18, #26 */
481 set_git_dir(gitdirenv);
482 free(gitfile);
e4e30347 483 return NULL;
b3f66fd3
NTND
484 }
485 else if (git_work_tree_cfg) { /* #6, #14 */
486 if (is_absolute_path(git_work_tree_cfg))
487 set_git_work_tree(git_work_tree_cfg);
488 else {
489 char core_worktree[PATH_MAX];
490 if (chdir(gitdirenv))
491 die_errno("Could not chdir to '%s'", gitdirenv);
492 if (chdir(git_work_tree_cfg))
493 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
494 if (!getcwd(core_worktree, PATH_MAX))
495 die_errno("Could not get directory '%s'", git_work_tree_cfg);
496 if (chdir(cwd))
497 die_errno("Could not come back to cwd");
498 set_git_work_tree(core_worktree);
499 }
500 }
501 else /* #2, #10 */
502 set_git_work_tree(".");
503
504 /* set_git_work_tree() must have been called by now */
505 worktree = get_git_work_tree();
506
507 /* both get_git_work_tree() and cwd are already normalized */
508 if (!strcmp(cwd, worktree)) { /* cwd == worktree */
509 set_git_dir(gitdirenv);
510 free(gitfile);
e4e30347 511 return NULL;
b3f66fd3 512 }
e4e30347 513
9b125da4
NTND
514 offset = dir_inside_of(cwd, worktree);
515 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 516 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
517 if (chdir(worktree))
518 die_errno("Could not chdir to '%s'", worktree);
519 cwd[len++] = '/';
520 cwd[len] = '\0';
521 free(gitfile);
9b125da4 522 return cwd + offset;
93a00542 523 }
b3f66fd3
NTND
524
525 /* cwd outside worktree */
526 set_git_dir(gitdirenv);
527 free(gitfile);
528 return NULL;
93a00542
JN
529}
530
9951d3b3
NTND
531static const char *setup_discovered_git_dir(const char *gitdir,
532 char *cwd, int offset, int len,
533 int *nongit_ok)
98937bef 534{
9951d3b3
NTND
535 if (check_repository_format_gently(gitdir, nongit_ok))
536 return NULL;
98937bef 537
4868b2ea
JN
538 /* --work-tree is set without --git-dir; use discovered one */
539 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
540 if (offset != len && !is_absolute_path(gitdir))
e2a57aac 541 gitdir = xstrdup(real_path(gitdir));
4868b2ea
JN
542 if (chdir(cwd))
543 die_errno("Could not come back to cwd");
544 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
545 }
546
9951d3b3
NTND
547 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
548 if (is_bare_repository_cfg > 0) {
e2a57aac 549 set_git_dir(offset == len ? gitdir : real_path(gitdir));
9951d3b3
NTND
550 if (chdir(cwd))
551 die_errno("Could not come back to cwd");
98937bef 552 return NULL;
9951d3b3 553 }
98937bef 554
9951d3b3
NTND
555 /* #0, #1, #5, #8, #9, #12, #13 */
556 set_git_work_tree(".");
557 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
558 set_git_dir(gitdir);
98937bef 559 inside_git_dir = 0;
9951d3b3 560 inside_work_tree = 1;
98937bef
NTND
561 if (offset == len)
562 return NULL;
563
564 /* Make "offset" point to past the '/', and add a '/' at the end */
565 offset++;
566 cwd[len++] = '/';
567 cwd[len] = 0;
568 return cwd + offset;
569}
570
1cd8031b
NTND
571/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
572static const char *setup_bare_git_dir(char *cwd, int offset, int len, int *nongit_ok)
68698da5
JN
573{
574 int root_len;
575
1cd8031b
NTND
576 if (check_repository_format_gently(".", nongit_ok))
577 return NULL;
578
4868b2ea
JN
579 /* --work-tree is set without --git-dir; use discovered one */
580 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
581 const char *gitdir;
582
583 gitdir = offset == len ? "." : xmemdupz(cwd, offset);
584 if (chdir(cwd))
585 die_errno("Could not come back to cwd");
586 return setup_explicit_git_dir(gitdir, cwd, len, nongit_ok);
587 }
588
68698da5 589 inside_git_dir = 1;
1cd8031b 590 inside_work_tree = 0;
68698da5 591 if (offset != len) {
8fc0ae80
NTND
592 if (chdir(cwd))
593 die_errno("Cannot come back to cwd");
68698da5
JN
594 root_len = offset_1st_component(cwd);
595 cwd[offset > root_len ? offset : root_len] = '\0';
596 set_git_dir(cwd);
337e51ce 597 }
1cd8031b 598 else
68698da5 599 set_git_dir(".");
68698da5
JN
600 return NULL;
601}
602
f161edeb
JN
603static const char *setup_nongit(const char *cwd, int *nongit_ok)
604{
605 if (!nongit_ok)
606 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
607 if (chdir(cwd))
608 die_errno("Cannot come back to cwd");
609 *nongit_ok = 1;
610 return NULL;
611}
612
2565b43b 613static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
614{
615 struct stat buf;
2565b43b
CB
616 if (stat(path, &buf)) {
617 die_errno("failed to stat '%*s%s%s'",
618 prefix_len,
60c98d1e
JN
619 prefix ? prefix : "",
620 prefix ? "/" : "", path);
2565b43b 621 }
60c98d1e
JN
622 return buf.st_dev;
623}
624
e90fdc39
JS
625/*
626 * We cannot decide in this function whether we are in the work tree or
627 * not, since the config can only be read _after_ this function was called.
628 */
a60645f9 629static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 630{
0454dd93 631 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
d288a700 632 static char cwd[PATH_MAX+1];
9951d3b3
NTND
633 const char *gitdirenv, *ret;
634 char *gitfile;
2565b43b 635 int len, offset, offset_parent, ceil_offset;
c7d1d1b1
RH
636 dev_t current_device = 0;
637 int one_filesystem = 1;
d288a700 638
af05d679
SG
639 /*
640 * Let's assume that we are in a git repository.
641 * If it turns out later that we are somewhere else, the value will be
642 * updated accordingly.
643 */
644 if (nongit_ok)
645 *nongit_ok = 0;
646
b3f66fd3
NTND
647 if (!getcwd(cwd, sizeof(cwd)-1))
648 die_errno("Unable to read current working directory");
649 offset = len = strlen(cwd);
650
e90fdc39
JS
651 /*
652 * If GIT_DIR is set explicitly, we're not going
653 * to do any discovery, but we still do repository
654 * validation.
655 */
ad1a382f 656 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e4e30347 657 if (gitdirenv)
b3f66fd3 658 return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
d288a700 659
0454dd93 660 ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
17d778e7
JH
661 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
662 ceil_offset = 1;
d288a700 663
892c41b9 664 /*
e90fdc39 665 * Test in the following order (relative to the cwd):
b44ebb19 666 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
667 * - .git/
668 * - ./ (bare)
b44ebb19 669 * - ../.git
e90fdc39
JS
670 * - ../.git/
671 * - ../ (bare)
672 * - ../../.git/
673 * etc.
892c41b9 674 */
cf87463e 675 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 676 if (one_filesystem)
2565b43b 677 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 678 for (;;) {
13d6ec91 679 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
680 if (gitfile)
681 gitdirenv = gitfile = xstrdup(gitfile);
682 else {
683 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
684 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
685 }
686
687 if (gitdirenv) {
688 ret = setup_discovered_git_dir(gitdirenv,
689 cwd, offset, len,
690 nongit_ok);
691 free(gitfile);
692 return ret;
693 }
694 free(gitfile);
695
68698da5 696 if (is_git_directory("."))
1cd8031b
NTND
697 return setup_bare_git_dir(cwd, offset, len, nongit_ok);
698
2565b43b
CB
699 offset_parent = offset;
700 while (--offset_parent > ceil_offset && cwd[offset_parent] != '/');
701 if (offset_parent <= ceil_offset)
f161edeb 702 return setup_nongit(cwd, nongit_ok);
8030e442 703 if (one_filesystem) {
2565b43b 704 dev_t parent_device = get_device_or_die("..", cwd, offset);
60c98d1e 705 if (parent_device != current_device) {
8030e442
LD
706 if (nongit_ok) {
707 if (chdir(cwd))
708 die_errno("Cannot come back to cwd");
709 *nongit_ok = 1;
710 return NULL;
711 }
712 cwd[offset] = '\0';
2565b43b 713 die("Not a git repository (or any parent up to mount point %s)\n"
cf87463e 714 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
8030e442
LD
715 }
716 }
502ffe34
LD
717 if (chdir("..")) {
718 cwd[offset] = '\0';
d824cbba 719 die_errno("Cannot change to '%s/..'", cwd);
502ffe34 720 }
2565b43b 721 offset = offset_parent;
892c41b9 722 }
d288a700 723}
5e7bfe25 724
a60645f9
NTND
725const char *setup_git_directory_gently(int *nongit_ok)
726{
727 const char *prefix;
728
729 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f
DA
730 if (prefix)
731 setenv("GIT_PREFIX", prefix, 1);
732 else
733 setenv("GIT_PREFIX", "", 1);
734
f07d6a1a 735 if (startup_info) {
a60645f9 736 startup_info->have_repository = !nongit_ok || !*nongit_ok;
f07d6a1a
NTND
737 startup_info->prefix = prefix;
738 }
a60645f9
NTND
739 return prefix;
740}
741
94df2506
JH
742int git_config_perm(const char *var, const char *value)
743{
06cbe855
HO
744 int i;
745 char *endptr;
746
747 if (value == NULL)
748 return PERM_GROUP;
749
750 if (!strcmp(value, "umask"))
751 return PERM_UMASK;
752 if (!strcmp(value, "group"))
753 return PERM_GROUP;
754 if (!strcmp(value, "all") ||
755 !strcmp(value, "world") ||
756 !strcmp(value, "everybody"))
757 return PERM_EVERYBODY;
758
759 /* Parse octal numbers */
760 i = strtol(value, &endptr, 8);
761
762 /* If not an octal number, maybe true/false? */
763 if (*endptr != 0)
764 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
765
766 /*
767 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 768 * a chmod value to restrict to.
06cbe855
HO
769 */
770 switch (i) {
771 case PERM_UMASK: /* 0 */
772 return PERM_UMASK;
773 case OLD_PERM_GROUP: /* 1 */
774 return PERM_GROUP;
775 case OLD_PERM_EVERYBODY: /* 2 */
776 return PERM_EVERYBODY;
94df2506 777 }
06cbe855
HO
778
779 /* A filemode value was given: 0xxx */
780
781 if ((i & 0600) != 0600)
782 die("Problem with core.sharedRepository filemode value "
783 "(0%.3o).\nThe owner of files must always have "
784 "read and write permissions.", i);
785
786 /*
787 * Mask filemode value. Others can not get write permission.
788 * x flags for directories are handled separately.
789 */
5a688fe4 790 return -(i & 0666);
94df2506
JH
791}
792
ef90d6d4 793int check_repository_format_version(const char *var, const char *value, void *cb)
ab9cb76f 794{
299726d5
JS
795 if (strcmp(var, "core.repositoryformatversion") == 0)
796 repository_format_version = git_config_int(var, value);
457f06d6 797 else if (strcmp(var, "core.sharedrepository") == 0)
94df2506 798 shared_repository = git_config_perm(var, value);
e90fdc39
JS
799 else if (strcmp(var, "core.bare") == 0) {
800 is_bare_repository_cfg = git_config_bool(var, value);
801 if (is_bare_repository_cfg == 1)
802 inside_work_tree = -1;
803 } else if (strcmp(var, "core.worktree") == 0) {
180483c5
JH
804 if (!value)
805 return config_error_nonbool(var);
8e0f7003 806 free(git_work_tree_cfg);
e90fdc39
JS
807 git_work_tree_cfg = xstrdup(value);
808 inside_work_tree = -1;
809 }
299726d5 810 return 0;
ab9cb76f
JH
811}
812
813int check_repository_format(void)
814{
337e51ce 815 return check_repository_format_gently(get_git_dir(), NULL);
ab9cb76f
JH
816}
817
e1e5ec86
CB
818/*
819 * Returns the "prefix", a path to the current working directory
820 * relative to the work tree root, or NULL, if the current working
821 * directory is not a strict subdirectory of the work tree root. The
822 * prefix always ends with a '/' character.
823 */
5e7bfe25
JH
824const char *setup_git_directory(void)
825{
b3f66fd3 826 return setup_git_directory_gently(NULL);
5e7bfe25 827}
abc06822
FG
828
829const char *resolve_gitdir(const char *suspect)
830{
831 if (is_git_directory(suspect))
832 return suspect;
efc5fb6a 833 return read_gitfile(suspect);
abc06822 834}