Merge branch 'maint' of git://github.com/git-l10n/git-po into maint
[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;
fada7674 7static int work_tree_config_is_bogus;
00a09d57 8static struct string_list unknown_extensions = STRING_LIST_INIT_DUP;
d288a700 9
ddc2a628
MEW
10/*
11 * The input parameter must contain an absolute path, and it must already be
12 * normalized.
13 *
14 * Find the part of an absolute path that lies inside the work tree by
15 * dereferencing symlinks outside the work tree, for example:
16 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
17 * /dir/file (work tree is /) -> dir/file
18 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
19 * /dir/repolink/file (repolink points to /dir/repo) -> file
20 * /dir/repo (exactly equal to work tree) -> (empty string)
21 */
22static int abspath_part_inside_repo(char *path)
23{
24 size_t len;
25 size_t wtlen;
26 char *path0;
27 int off;
28 const char *work_tree = get_git_work_tree();
29
30 if (!work_tree)
31 return -1;
32 wtlen = strlen(work_tree);
33 len = strlen(path);
6127ff63 34 off = offset_1st_component(path);
ddc2a628
MEW
35
36 /* check if work tree is already the prefix */
37 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
38 if (path[wtlen] == '/') {
39 memmove(path, path + wtlen + 1, len - wtlen);
40 return 0;
41 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
42 /* work tree is the root, or the whole path */
43 memmove(path, path + wtlen, len - wtlen + 1);
44 return 0;
45 }
46 /* work tree might match beginning of a symlink to work tree */
47 off = wtlen;
48 }
49 path0 = path;
6127ff63 50 path += off;
ddc2a628
MEW
51
52 /* check each '/'-terminated level */
53 while (*path) {
54 path++;
55 if (*path == '/') {
56 *path = '\0';
57 if (strcmp(real_path(path0), work_tree) == 0) {
58 memmove(path0, path + 1, len - (path - path0));
59 return 0;
60 }
61 *path = '/';
62 }
63 }
64
65 /* check whole path */
66 if (strcmp(real_path(path0), work_tree) == 0) {
67 *path0 = '\0';
68 return 0;
69 }
70
71 return -1;
72}
73
645a29c4
NTND
74/*
75 * Normalize "path", prepending the "prefix" for relative paths. If
76 * remaining_prefix is not NULL, return the actual prefix still
77 * remains in the path. For example, prefix = sub1/sub2/ and path is
78 *
79 * foo -> sub1/sub2/foo (full prefix)
80 * ../foo -> sub1/foo (remaining prefix is sub1/)
81 * ../../bar -> bar (no remaining prefix)
82 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
83 * `pwd`/../bar -> sub1/bar (no remaining prefix)
84 */
85char *prefix_path_gently(const char *prefix, int len,
86 int *remaining_prefix, const char *path)
d089ebaa
JH
87{
88 const char *orig = path;
18e051a3
CMAB
89 char *sanitized;
90 if (is_absolute_path(orig)) {
655ee9ea 91 sanitized = xmalloc(strlen(path) + 1);
645a29c4
NTND
92 if (remaining_prefix)
93 *remaining_prefix = 0;
655ee9ea
MEW
94 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
95 free(sanitized);
96 return NULL;
97 }
98 if (abspath_part_inside_repo(sanitized)) {
99 free(sanitized);
100 return NULL;
101 }
18e051a3 102 } else {
75faa45a 103 sanitized = xstrfmt("%.*s%s", len, prefix, path);
645a29c4
NTND
104 if (remaining_prefix)
105 *remaining_prefix = len;
655ee9ea 106 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
546e0fd9
JK
107 free(sanitized);
108 return NULL;
d089ebaa 109 }
d089ebaa
JH
110 }
111 return sanitized;
f332726e
LT
112}
113
546e0fd9
JK
114char *prefix_path(const char *prefix, int len, const char *path)
115{
645a29c4 116 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
117 if (!r)
118 die("'%s' is outside repository", path);
119 return r;
120}
121
122int path_inside_repo(const char *prefix, const char *path)
123{
124 int len = prefix ? strlen(prefix) : 0;
645a29c4 125 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
126 if (r) {
127 free(r);
128 return 1;
129 }
130 return 0;
131}
132
c6e8c800
JH
133int check_filename(const char *prefix, const char *arg)
134{
135 const char *name;
136 struct stat st;
137
59556548 138 if (starts_with(arg, ":/")) {
4db86e8b
NTND
139 if (arg[2] == '\0') /* ":/" is root dir, always exists */
140 return 1;
141 name = arg + 2;
28fcc0b7
NTND
142 } else if (!no_wildcard(arg))
143 return 1;
144 else if (prefix)
4db86e8b
NTND
145 name = prefix_filename(prefix, strlen(prefix), arg);
146 else
147 name = arg;
c6e8c800
JH
148 if (!lstat(name, &st))
149 return 1; /* file exists */
150 if (errno == ENOENT || errno == ENOTDIR)
151 return 0; /* file does not exist */
152 die_errno("failed to stat '%s'", arg);
153}
154
023e37c3
MM
155static void NORETURN die_verify_filename(const char *prefix,
156 const char *arg,
157 int diagnose_misspelt_rev)
009fee47 158{
023e37c3
MM
159 if (!diagnose_misspelt_rev)
160 die("%s: no such path in the working tree.\n"
4d4b5739 161 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
023e37c3 162 arg);
0e539dca
JH
163 /*
164 * Saying "'(icase)foo' does not exist in the index" when the
165 * user gave us ":(icase)foo" is just stupid. A magic pathspec
166 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 167 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
168 */
169 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 170 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 171
009fee47
MM
172 /* ... or fall back the most general message. */
173 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
4d4b5739
MM
174 "Use '--' to separate paths from revisions, like this:\n"
175 "'git <command> [<revision>...] -- [<file>...]'", arg);
009fee47
MM
176
177}
178
e23d0b4a
LT
179/*
180 * Verify a filename that we got as an argument for a pathspec
181 * entry. Note that a filename that begins with "-" never verifies
182 * as true, because even if such a filename were to exist, we want
183 * it to be preceded by the "--" marker (or we want the user to
184 * use a format like "./-filename")
023e37c3
MM
185 *
186 * The "diagnose_misspelt_rev" is used to provide a user-friendly
187 * diagnosis when dying upon finding that "name" is not a pathname.
188 * If set to 1, the diagnosis will try to diagnose "name" as an
189 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
190 * will only complain about an inexisting file.
191 *
192 * This function is typically called to check that a "file or rev"
193 * argument is unambiguous. In this case, the caller will want
194 * diagnose_misspelt_rev == 1 when verifying the first non-rev
195 * argument (which could have been a revision), and
196 * diagnose_misspelt_rev == 0 for the next ones (because we already
197 * saw a filename, there's not ambiguity anymore).
e23d0b4a 198 */
023e37c3
MM
199void verify_filename(const char *prefix,
200 const char *arg,
201 int diagnose_misspelt_rev)
e23d0b4a 202{
e23d0b4a
LT
203 if (*arg == '-')
204 die("bad flag '%s' used after filename", arg);
c6e8c800 205 if (check_filename(prefix, arg))
e23d0b4a 206 return;
023e37c3 207 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
208}
209
ea92f41f
JH
210/*
211 * Opposite of the above: the command line did not have -- marker
212 * and we parsed the arg as a refname. It should not be interpretable
213 * as a filename.
214 */
215void verify_non_filename(const char *prefix, const char *arg)
216{
7ae3df8c 217 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 218 return;
ea92f41f
JH
219 if (*arg == '-')
220 return; /* flag */
c6e8c800
JH
221 if (!check_filename(prefix, arg))
222 return;
223 die("ambiguous argument '%s': both revision and filename\n"
4d4b5739
MM
224 "Use '--' to separate paths from revisions, like this:\n"
225 "'git <command> [<revision>...] -- [<file>...]'", arg);
ea92f41f
JH
226}
227
31e26ebc 228int get_common_dir(struct strbuf *sb, const char *gitdir)
11f9dd71
MK
229{
230 const char *git_env_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
231 if (git_env_common_dir) {
232 strbuf_addstr(sb, git_env_common_dir);
233 return 1;
234 } else {
235 return get_common_dir_noenv(sb, gitdir);
236 }
237}
238
239int get_common_dir_noenv(struct strbuf *sb, const char *gitdir)
4dc4e145
NTND
240{
241 struct strbuf data = STRBUF_INIT;
242 struct strbuf path = STRBUF_INIT;
31e26ebc 243 int ret = 0;
11f9dd71 244
4dc4e145
NTND
245 strbuf_addf(&path, "%s/commondir", gitdir);
246 if (file_exists(path.buf)) {
247 if (strbuf_read_file(&data, path.buf, 0) <= 0)
248 die_errno(_("failed to read %s"), path.buf);
249 while (data.len && (data.buf[data.len - 1] == '\n' ||
250 data.buf[data.len - 1] == '\r'))
251 data.len--;
252 data.buf[data.len] = '\0';
253 strbuf_reset(&path);
254 if (!is_absolute_path(data.buf))
255 strbuf_addf(&path, "%s/", gitdir);
256 strbuf_addbuf(&path, &data);
257 strbuf_addstr(sb, real_path(path.buf));
31e26ebc 258 ret = 1;
4dc4e145
NTND
259 } else
260 strbuf_addstr(sb, gitdir);
261 strbuf_release(&data);
262 strbuf_release(&path);
31e26ebc 263 return ret;
4dc4e145 264}
d288a700 265
5f5608bc 266/*
ad1a382f 267 * Test if it looks like we're at a git directory.
5e7bfe25 268 * We want to see:
5f5608bc 269 *
790296fd 270 * - either an objects/ directory _or_ the proper
5f5608bc 271 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 272 * - a refs/ directory
8098a178 273 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
274 * a proper "ref:", or a regular file HEAD that has a properly
275 * formatted sha1 object name.
5f5608bc 276 */
b3256eb8 277int is_git_directory(const char *suspect)
5f5608bc 278{
1d186b6f
NTND
279 struct strbuf path = STRBUF_INIT;
280 int ret = 0;
281 size_t len;
ad1a382f 282
4dc4e145
NTND
283 /* Check worktree-related signatures */
284 strbuf_addf(&path, "%s/HEAD", suspect);
285 if (validate_headref(path.buf))
286 goto done;
287
288 strbuf_reset(&path);
289 get_common_dir(&path, suspect);
1d186b6f 290 len = path.len;
4dc4e145
NTND
291
292 /* Check non-worktree-related signatures */
ad1a382f
SP
293 if (getenv(DB_ENVIRONMENT)) {
294 if (access(getenv(DB_ENVIRONMENT), X_OK))
1d186b6f 295 goto done;
ad1a382f
SP
296 }
297 else {
4dc4e145 298 strbuf_setlen(&path, len);
1d186b6f
NTND
299 strbuf_addstr(&path, "/objects");
300 if (access(path.buf, X_OK))
301 goto done;
ad1a382f
SP
302 }
303
1d186b6f
NTND
304 strbuf_setlen(&path, len);
305 strbuf_addstr(&path, "/refs");
306 if (access(path.buf, X_OK))
307 goto done;
ad1a382f 308
1d186b6f
NTND
309 ret = 1;
310done:
311 strbuf_release(&path);
312 return ret;
5f5608bc
LT
313}
314
68025633
JS
315int is_inside_git_dir(void)
316{
e90fdc39
JS
317 if (inside_git_dir < 0)
318 inside_git_dir = is_inside_dir(get_git_dir());
319 return inside_git_dir;
892c41b9
ML
320}
321
892c41b9
ML
322int is_inside_work_tree(void)
323{
e90fdc39
JS
324 if (inside_work_tree < 0)
325 inside_work_tree = is_inside_dir(get_git_work_tree());
326 return inside_work_tree;
892c41b9
ML
327}
328
f3fa1838
JH
329void setup_work_tree(void)
330{
354e6534
JS
331 const char *work_tree, *git_dir;
332 static int initialized = 0;
333
334 if (initialized)
335 return;
fada7674
JK
336
337 if (work_tree_config_is_bogus)
338 die("unable to set up work tree using invalid config");
339
354e6534
JS
340 work_tree = get_git_work_tree();
341 git_dir = get_git_dir();
59f0f2f3 342 if (!is_absolute_path(git_dir))
e2a57aac 343 git_dir = real_path(get_git_dir());
59f0f2f3
MH
344 if (!work_tree || chdir(work_tree))
345 die("This operation must be run in a work tree");
0ed74813
NTND
346
347 /*
348 * Make sure subsequent git processes find correct worktree
349 * if $GIT_WORK_TREE is set relative
350 */
351 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
352 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
353
41894ae3 354 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 355 initialized = 1;
59f0f2f3
MH
356}
357
31e26ebc
NTND
358static int check_repo_format(const char *var, const char *value, void *cb)
359{
00a09d57
JK
360 const char *ext;
361
31e26ebc
NTND
362 if (strcmp(var, "core.repositoryformatversion") == 0)
363 repository_format_version = git_config_int(var, value);
364 else if (strcmp(var, "core.sharedrepository") == 0)
365 shared_repository = git_config_perm(var, value);
00a09d57
JK
366 else if (skip_prefix(var, "extensions.", &ext)) {
367 /*
368 * record any known extensions here; otherwise,
369 * we fall through to recording it as unknown, and
370 * check_repository_format will complain
371 */
372 if (!strcmp(ext, "noop"))
373 ;
067fbd41
JK
374 else if (!strcmp(ext, "preciousobjects"))
375 repository_format_precious_objects = git_config_bool(var, value);
00a09d57
JK
376 else
377 string_list_append(&unknown_extensions, ext);
378 }
31e26ebc
NTND
379 return 0;
380}
381
337e51ce 382static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 383{
7d0fb0da
NTND
384 struct strbuf sb = STRBUF_INIT;
385 const char *repo_config;
31e26ebc 386 config_fn_t fn;
7d0fb0da 387 int ret = 0;
337e51ce 388
00a09d57
JK
389 string_list_clear(&unknown_extensions, 0);
390
31e26ebc
NTND
391 if (get_common_dir(&sb, gitdir))
392 fn = check_repo_format;
393 else
394 fn = check_repository_format_version;
e61a509a
NTND
395 strbuf_addstr(&sb, "/config");
396 repo_config = sb.buf;
397
337e51ce
NTND
398 /*
399 * git_config() can't be used here because it calls git_pathdup()
400 * to get $GIT_CONFIG/config. That call will make setup_git_env()
401 * set git_dir to ".git".
402 *
403 * We are in gitdir setup, no git dir has been found useable yet.
404 * Use a gentler version of git_config() to check if this repo
405 * is a good one.
406 */
31e26ebc 407 git_config_early(fn, NULL, repo_config);
00a09d57 408 if (GIT_REPO_VERSION_READ < repository_format_version) {
9459aa77
NTND
409 if (!nongit_ok)
410 die ("Expected git repo version <= %d, found %d",
00a09d57 411 GIT_REPO_VERSION_READ, repository_format_version);
9459aa77 412 warning("Expected git repo version <= %d, found %d",
00a09d57 413 GIT_REPO_VERSION_READ, repository_format_version);
9459aa77
NTND
414 warning("Please upgrade Git");
415 *nongit_ok = -1;
7d0fb0da 416 ret = -1;
9459aa77 417 }
00a09d57
JK
418
419 if (repository_format_version >= 1 && unknown_extensions.nr) {
420 int i;
421
422 if (!nongit_ok)
423 die("unknown repository extension: %s",
424 unknown_extensions.items[0].string);
425
426 for (i = 0; i < unknown_extensions.nr; i++)
427 warning("unknown repository extension: %s",
428 unknown_extensions.items[i].string);
429 *nongit_ok = -1;
430 ret = -1;
431 }
432
7d0fb0da
NTND
433 strbuf_release(&sb);
434 return ret;
9459aa77
NTND
435}
436
23af91d1
NTND
437static void update_linked_gitdir(const char *gitfile, const char *gitdir)
438{
439 struct strbuf path = STRBUF_INIT;
440 struct stat st;
441
82fde87f 442 strbuf_addf(&path, "%s/gitdir", gitdir);
23af91d1 443 if (stat(path.buf, &st) || st.st_mtime + 24 * 3600 < time(NULL))
91d54694 444 write_file(path.buf, "%s", gitfile);
23af91d1
NTND
445 strbuf_release(&path);
446}
447
b44ebb19
LH
448/*
449 * Try to read the location of the git directory from the .git file,
450 * return path to git directory if found.
a93bedad
EE
451 *
452 * On failure, if return_error_code is not NULL, return_error_code
453 * will be set to an error code and NULL will be returned. If
454 * return_error_code is NULL the function will die instead (for most
455 * cases).
b44ebb19 456 */
a93bedad 457const char *read_gitfile_gently(const char *path, int *return_error_code)
b44ebb19 458{
921bdd96 459 const int max_file_size = 1 << 20; /* 1MB */
a93bedad
EE
460 int error_code = 0;
461 char *buf = NULL;
462 char *dir = NULL;
40c813e0 463 const char *slash;
b44ebb19
LH
464 struct stat st;
465 int fd;
b1905aea 466 ssize_t len;
b44ebb19 467
a93bedad
EE
468 if (stat(path, &st)) {
469 error_code = READ_GITFILE_ERR_STAT_FAILED;
470 goto cleanup_return;
471 }
472 if (!S_ISREG(st.st_mode)) {
473 error_code = READ_GITFILE_ERR_NOT_A_FILE;
474 goto cleanup_return;
475 }
921bdd96
EE
476 if (st.st_size > max_file_size) {
477 error_code = READ_GITFILE_ERR_TOO_LARGE;
478 goto cleanup_return;
479 }
b44ebb19 480 fd = open(path, O_RDONLY);
a93bedad
EE
481 if (fd < 0) {
482 error_code = READ_GITFILE_ERR_OPEN_FAILED;
483 goto cleanup_return;
484 }
b44ebb19
LH
485 buf = xmalloc(st.st_size + 1);
486 len = read_in_full(fd, buf, st.st_size);
487 close(fd);
a93bedad
EE
488 if (len != st.st_size) {
489 error_code = READ_GITFILE_ERR_READ_FAILED;
490 goto cleanup_return;
491 }
b44ebb19 492 buf[len] = '\0';
a93bedad
EE
493 if (!starts_with(buf, "gitdir: ")) {
494 error_code = READ_GITFILE_ERR_INVALID_FORMAT;
495 goto cleanup_return;
496 }
b44ebb19
LH
497 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
498 len--;
a93bedad
EE
499 if (len < 9) {
500 error_code = READ_GITFILE_ERR_NO_PATH;
501 goto cleanup_return;
502 }
b44ebb19 503 buf[len] = '\0';
40c813e0
BK
504 dir = buf + 8;
505
506 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
507 size_t pathlen = slash+1 - path;
75faa45a
JK
508 dir = xstrfmt("%.*s%.*s", (int)pathlen, path,
509 (int)(len - 8), buf + 8);
40c813e0
BK
510 free(buf);
511 buf = dir;
512 }
a93bedad
EE
513 if (!is_git_directory(dir)) {
514 error_code = READ_GITFILE_ERR_NOT_A_REPO;
515 goto cleanup_return;
516 }
23af91d1 517 update_linked_gitdir(path, dir);
e2a57aac 518 path = real_path(dir);
40c813e0 519
a93bedad 520cleanup_return:
a93bedad
EE
521 if (return_error_code)
522 *return_error_code = error_code;
38ae8784 523 else if (error_code) {
a93bedad
EE
524 switch (error_code) {
525 case READ_GITFILE_ERR_STAT_FAILED:
526 case READ_GITFILE_ERR_NOT_A_FILE:
38ae8784
JK
527 /* non-fatal; follow return path */
528 break;
a93bedad
EE
529 case READ_GITFILE_ERR_OPEN_FAILED:
530 die_errno("Error opening '%s'", path);
921bdd96
EE
531 case READ_GITFILE_ERR_TOO_LARGE:
532 die("Too large to be a .git file: '%s'", path);
a93bedad
EE
533 case READ_GITFILE_ERR_READ_FAILED:
534 die("Error reading %s", path);
535 case READ_GITFILE_ERR_INVALID_FORMAT:
536 die("Invalid gitfile format: %s", path);
537 case READ_GITFILE_ERR_NO_PATH:
538 die("No path in gitfile: %s", path);
539 case READ_GITFILE_ERR_NOT_A_REPO:
540 die("Not a git repository: %s", dir);
541 default:
542 assert(0);
543 }
544 }
545
b44ebb19 546 free(buf);
38ae8784 547 return error_code ? NULL : path;
b44ebb19
LH
548}
549
e4e30347 550static const char *setup_explicit_git_dir(const char *gitdirenv,
7333ed17 551 struct strbuf *cwd,
b3f66fd3 552 int *nongit_ok)
e4e30347 553{
b3f66fd3
NTND
554 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
555 const char *worktree;
556 char *gitfile;
9b125da4 557 int offset;
e4e30347
JN
558
559 if (PATH_MAX - 40 < strlen(gitdirenv))
560 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 561
13d6ec91 562 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
563 if (gitfile) {
564 gitfile = xstrdup(gitfile);
565 gitdirenv = gitfile;
566 }
567
e4e30347
JN
568 if (!is_git_directory(gitdirenv)) {
569 if (nongit_ok) {
570 *nongit_ok = 1;
b3f66fd3 571 free(gitfile);
e4e30347
JN
572 return NULL;
573 }
574 die("Not a git repository: '%s'", gitdirenv);
575 }
b3f66fd3
NTND
576
577 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
578 free(gitfile);
579 return NULL;
e4e30347 580 }
b3f66fd3
NTND
581
582 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
583 if (work_tree_env)
584 set_git_work_tree(work_tree_env);
585 else if (is_bare_repository_cfg > 0) {
fada7674
JK
586 if (git_work_tree_cfg) {
587 /* #22.2, #30 */
588 warning("core.bare and core.worktree do not make sense");
589 work_tree_config_is_bogus = 1;
590 }
b3f66fd3
NTND
591
592 /* #18, #26 */
593 set_git_dir(gitdirenv);
594 free(gitfile);
e4e30347 595 return NULL;
b3f66fd3
NTND
596 }
597 else if (git_work_tree_cfg) { /* #6, #14 */
598 if (is_absolute_path(git_work_tree_cfg))
599 set_git_work_tree(git_work_tree_cfg);
600 else {
56b9f6e7 601 char *core_worktree;
b3f66fd3
NTND
602 if (chdir(gitdirenv))
603 die_errno("Could not chdir to '%s'", gitdirenv);
604 if (chdir(git_work_tree_cfg))
605 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
56b9f6e7 606 core_worktree = xgetcwd();
7333ed17 607 if (chdir(cwd->buf))
b3f66fd3
NTND
608 die_errno("Could not come back to cwd");
609 set_git_work_tree(core_worktree);
56b9f6e7 610 free(core_worktree);
b3f66fd3
NTND
611 }
612 }
2cd83d10
JK
613 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
614 /* #16d */
615 set_git_dir(gitdirenv);
616 free(gitfile);
617 return NULL;
618 }
b3f66fd3
NTND
619 else /* #2, #10 */
620 set_git_work_tree(".");
621
622 /* set_git_work_tree() must have been called by now */
623 worktree = get_git_work_tree();
624
625 /* both get_git_work_tree() and cwd are already normalized */
7333ed17 626 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
b3f66fd3
NTND
627 set_git_dir(gitdirenv);
628 free(gitfile);
e4e30347 629 return NULL;
b3f66fd3 630 }
e4e30347 631
7333ed17 632 offset = dir_inside_of(cwd->buf, worktree);
9b125da4 633 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 634 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
635 if (chdir(worktree))
636 die_errno("Could not chdir to '%s'", worktree);
7333ed17 637 strbuf_addch(cwd, '/');
b3f66fd3 638 free(gitfile);
7333ed17 639 return cwd->buf + offset;
93a00542 640 }
b3f66fd3
NTND
641
642 /* cwd outside worktree */
643 set_git_dir(gitdirenv);
644 free(gitfile);
645 return NULL;
93a00542
JN
646}
647
9951d3b3 648static const char *setup_discovered_git_dir(const char *gitdir,
7333ed17 649 struct strbuf *cwd, int offset,
9951d3b3 650 int *nongit_ok)
98937bef 651{
9951d3b3
NTND
652 if (check_repository_format_gently(gitdir, nongit_ok))
653 return NULL;
98937bef 654
4868b2ea
JN
655 /* --work-tree is set without --git-dir; use discovered one */
656 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
7333ed17 657 if (offset != cwd->len && !is_absolute_path(gitdir))
e2a57aac 658 gitdir = xstrdup(real_path(gitdir));
7333ed17 659 if (chdir(cwd->buf))
4868b2ea 660 die_errno("Could not come back to cwd");
7333ed17 661 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
662 }
663
9951d3b3
NTND
664 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
665 if (is_bare_repository_cfg > 0) {
7333ed17
RS
666 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
667 if (chdir(cwd->buf))
9951d3b3 668 die_errno("Could not come back to cwd");
98937bef 669 return NULL;
9951d3b3 670 }
98937bef 671
9951d3b3
NTND
672 /* #0, #1, #5, #8, #9, #12, #13 */
673 set_git_work_tree(".");
674 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
675 set_git_dir(gitdir);
98937bef 676 inside_git_dir = 0;
9951d3b3 677 inside_work_tree = 1;
7333ed17 678 if (offset == cwd->len)
98937bef
NTND
679 return NULL;
680
681 /* Make "offset" point to past the '/', and add a '/' at the end */
682 offset++;
7333ed17
RS
683 strbuf_addch(cwd, '/');
684 return cwd->buf + offset;
98937bef
NTND
685}
686
1cd8031b 687/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
7333ed17
RS
688static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
689 int *nongit_ok)
68698da5
JN
690{
691 int root_len;
692
1cd8031b
NTND
693 if (check_repository_format_gently(".", nongit_ok))
694 return NULL;
695
2cd83d10
JK
696 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
697
4868b2ea
JN
698 /* --work-tree is set without --git-dir; use discovered one */
699 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
700 const char *gitdir;
701
7333ed17
RS
702 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
703 if (chdir(cwd->buf))
4868b2ea 704 die_errno("Could not come back to cwd");
7333ed17 705 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
706 }
707
68698da5 708 inside_git_dir = 1;
1cd8031b 709 inside_work_tree = 0;
7333ed17
RS
710 if (offset != cwd->len) {
711 if (chdir(cwd->buf))
8fc0ae80 712 die_errno("Cannot come back to cwd");
7333ed17
RS
713 root_len = offset_1st_component(cwd->buf);
714 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
715 set_git_dir(cwd->buf);
337e51ce 716 }
1cd8031b 717 else
68698da5 718 set_git_dir(".");
68698da5
JN
719 return NULL;
720}
721
f161edeb
JN
722static const char *setup_nongit(const char *cwd, int *nongit_ok)
723{
724 if (!nongit_ok)
725 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
726 if (chdir(cwd))
727 die_errno("Cannot come back to cwd");
728 *nongit_ok = 1;
729 return NULL;
730}
731
2565b43b 732static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
733{
734 struct stat buf;
2565b43b
CB
735 if (stat(path, &buf)) {
736 die_errno("failed to stat '%*s%s%s'",
737 prefix_len,
60c98d1e
JN
738 prefix ? prefix : "",
739 prefix ? "/" : "", path);
2565b43b 740 }
60c98d1e
JN
741 return buf.st_dev;
742}
743
9e2326c7 744/*
1b77d83c
MH
745 * A "string_list_each_func_t" function that canonicalizes an entry
746 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
747 * discards it if unusable. The presence of an empty entry in
748 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
749 * subsequent entries.
9e2326c7 750 */
1b77d83c 751static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 752 void *cb_data)
9e2326c7 753{
7ec30aaa 754 int *empty_entry_found = cb_data;
1b77d83c 755 char *ceil = item->string;
9e2326c7 756
7ec30aaa
MH
757 if (!*ceil) {
758 *empty_entry_found = 1;
9e2326c7 759 return 0;
7ec30aaa 760 } else if (!is_absolute_path(ceil)) {
9e2326c7 761 return 0;
7ec30aaa
MH
762 } else if (*empty_entry_found) {
763 /* Keep entry but do not canonicalize it */
764 return 1;
765 } else {
766 const char *real_path = real_path_if_valid(ceil);
767 if (!real_path)
768 return 0;
769 free(item->string);
770 item->string = xstrdup(real_path);
771 return 1;
772 }
9e2326c7
MH
773}
774
e90fdc39
JS
775/*
776 * We cannot decide in this function whether we are in the work tree or
777 * not, since the config can only be read _after_ this function was called.
778 */
a60645f9 779static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 780{
0454dd93 781 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 782 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
7333ed17 783 static struct strbuf cwd = STRBUF_INIT;
9951d3b3
NTND
784 const char *gitdirenv, *ret;
785 char *gitfile;
7333ed17 786 int offset, offset_parent, ceil_offset = -1;
c7d1d1b1
RH
787 dev_t current_device = 0;
788 int one_filesystem = 1;
d288a700 789
3c8687a7
TA
790 /*
791 * We may have read an incomplete configuration before
792 * setting-up the git directory. If so, clear the cache so
793 * that the next queries to the configuration reload complete
794 * configuration (including the per-repo config file that we
795 * ignored previously).
796 */
797 git_config_clear();
798
af05d679
SG
799 /*
800 * Let's assume that we are in a git repository.
801 * If it turns out later that we are somewhere else, the value will be
802 * updated accordingly.
803 */
804 if (nongit_ok)
805 *nongit_ok = 0;
806
7333ed17 807 if (strbuf_getcwd(&cwd))
b3f66fd3 808 die_errno("Unable to read current working directory");
7333ed17 809 offset = cwd.len;
b3f66fd3 810
e90fdc39
JS
811 /*
812 * If GIT_DIR is set explicitly, we're not going
813 * to do any discovery, but we still do repository
814 * validation.
815 */
ad1a382f 816 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e4e30347 817 if (gitdirenv)
7333ed17 818 return setup_explicit_git_dir(gitdirenv, &cwd, nongit_ok);
d288a700 819
31171d9e 820 if (env_ceiling_dirs) {
7ec30aaa
MH
821 int empty_entry_found = 0;
822
31171d9e 823 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 824 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 825 canonicalize_ceiling_entry, &empty_entry_found);
7333ed17 826 ceil_offset = longest_ancestor_length(cwd.buf, &ceiling_dirs);
31171d9e
MH
827 string_list_clear(&ceiling_dirs, 0);
828 }
829
7333ed17 830 if (ceil_offset < 0 && has_dos_drive_prefix(cwd.buf))
17d778e7 831 ceil_offset = 1;
d288a700 832
892c41b9 833 /*
e90fdc39 834 * Test in the following order (relative to the cwd):
b44ebb19 835 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
836 * - .git/
837 * - ./ (bare)
b44ebb19 838 * - ../.git
e90fdc39
JS
839 * - ../.git/
840 * - ../ (bare)
841 * - ../../.git/
842 * etc.
892c41b9 843 */
cf87463e 844 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 845 if (one_filesystem)
2565b43b 846 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 847 for (;;) {
13d6ec91 848 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
849 if (gitfile)
850 gitdirenv = gitfile = xstrdup(gitfile);
851 else {
852 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
853 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
854 }
855
856 if (gitdirenv) {
857 ret = setup_discovered_git_dir(gitdirenv,
7333ed17 858 &cwd, offset,
9951d3b3
NTND
859 nongit_ok);
860 free(gitfile);
861 return ret;
862 }
863 free(gitfile);
864
68698da5 865 if (is_git_directory("."))
7333ed17 866 return setup_bare_git_dir(&cwd, offset, nongit_ok);
1cd8031b 867
2565b43b 868 offset_parent = offset;
7333ed17 869 while (--offset_parent > ceil_offset && cwd.buf[offset_parent] != '/');
2565b43b 870 if (offset_parent <= ceil_offset)
7333ed17 871 return setup_nongit(cwd.buf, nongit_ok);
8030e442 872 if (one_filesystem) {
7333ed17
RS
873 dev_t parent_device = get_device_or_die("..", cwd.buf,
874 offset);
60c98d1e 875 if (parent_device != current_device) {
8030e442 876 if (nongit_ok) {
7333ed17 877 if (chdir(cwd.buf))
8030e442
LD
878 die_errno("Cannot come back to cwd");
879 *nongit_ok = 1;
880 return NULL;
881 }
7333ed17 882 strbuf_setlen(&cwd, offset);
2565b43b 883 die("Not a git repository (or any parent up to mount point %s)\n"
7333ed17
RS
884 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).",
885 cwd.buf);
8030e442
LD
886 }
887 }
502ffe34 888 if (chdir("..")) {
7333ed17
RS
889 strbuf_setlen(&cwd, offset);
890 die_errno("Cannot change to '%s/..'", cwd.buf);
502ffe34 891 }
2565b43b 892 offset = offset_parent;
892c41b9 893 }
d288a700 894}
5e7bfe25 895
a60645f9
NTND
896const char *setup_git_directory_gently(int *nongit_ok)
897{
898 const char *prefix;
899
900 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f 901 if (prefix)
a6f7f9a3 902 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 903 else
a6f7f9a3 904 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 905
f07d6a1a 906 if (startup_info) {
a60645f9 907 startup_info->have_repository = !nongit_ok || !*nongit_ok;
f07d6a1a
NTND
908 startup_info->prefix = prefix;
909 }
a60645f9
NTND
910 return prefix;
911}
912
94df2506
JH
913int git_config_perm(const char *var, const char *value)
914{
06cbe855
HO
915 int i;
916 char *endptr;
917
918 if (value == NULL)
919 return PERM_GROUP;
920
921 if (!strcmp(value, "umask"))
922 return PERM_UMASK;
923 if (!strcmp(value, "group"))
924 return PERM_GROUP;
925 if (!strcmp(value, "all") ||
926 !strcmp(value, "world") ||
927 !strcmp(value, "everybody"))
928 return PERM_EVERYBODY;
929
930 /* Parse octal numbers */
931 i = strtol(value, &endptr, 8);
932
933 /* If not an octal number, maybe true/false? */
934 if (*endptr != 0)
935 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
936
937 /*
938 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 939 * a chmod value to restrict to.
06cbe855
HO
940 */
941 switch (i) {
942 case PERM_UMASK: /* 0 */
943 return PERM_UMASK;
944 case OLD_PERM_GROUP: /* 1 */
945 return PERM_GROUP;
946 case OLD_PERM_EVERYBODY: /* 2 */
947 return PERM_EVERYBODY;
94df2506 948 }
06cbe855
HO
949
950 /* A filemode value was given: 0xxx */
951
952 if ((i & 0600) != 0600)
953 die("Problem with core.sharedRepository filemode value "
954 "(0%.3o).\nThe owner of files must always have "
955 "read and write permissions.", i);
956
957 /*
958 * Mask filemode value. Others can not get write permission.
959 * x flags for directories are handled separately.
960 */
5a688fe4 961 return -(i & 0666);
94df2506
JH
962}
963
ef90d6d4 964int check_repository_format_version(const char *var, const char *value, void *cb)
ab9cb76f 965{
31e26ebc
NTND
966 int ret = check_repo_format(var, value, cb);
967 if (ret)
968 return ret;
969 if (strcmp(var, "core.bare") == 0) {
e90fdc39
JS
970 is_bare_repository_cfg = git_config_bool(var, value);
971 if (is_bare_repository_cfg == 1)
972 inside_work_tree = -1;
973 } else if (strcmp(var, "core.worktree") == 0) {
180483c5
JH
974 if (!value)
975 return config_error_nonbool(var);
8e0f7003 976 free(git_work_tree_cfg);
e90fdc39
JS
977 git_work_tree_cfg = xstrdup(value);
978 inside_work_tree = -1;
979 }
299726d5 980 return 0;
ab9cb76f
JH
981}
982
983int check_repository_format(void)
984{
337e51ce 985 return check_repository_format_gently(get_git_dir(), NULL);
ab9cb76f
JH
986}
987
e1e5ec86
CB
988/*
989 * Returns the "prefix", a path to the current working directory
990 * relative to the work tree root, or NULL, if the current working
991 * directory is not a strict subdirectory of the work tree root. The
992 * prefix always ends with a '/' character.
993 */
5e7bfe25
JH
994const char *setup_git_directory(void)
995{
b3f66fd3 996 return setup_git_directory_gently(NULL);
5e7bfe25 997}
abc06822
FG
998
999const char *resolve_gitdir(const char *suspect)
1000{
1001 if (is_git_directory(suspect))
1002 return suspect;
efc5fb6a 1003 return read_gitfile(suspect);
abc06822 1004}
1d999ddd
TR
1005
1006/* if any standard file descriptor is missing open it to /dev/null */
1007void sanitize_stdfds(void)
1008{
1009 int fd = open("/dev/null", O_RDWR, 0);
1010 while (fd != -1 && fd < 2)
1011 fd = dup(fd);
1012 if (fd == -1)
1013 die_errno("open /dev/null or dup failed");
1014 if (fd > 2)
1015 close(fd);
1016}
de0957ce
NTND
1017
1018int daemonize(void)
1019{
1020#ifdef NO_POSIX_GOODIES
1021 errno = ENOSYS;
1022 return -1;
1023#else
1024 switch (fork()) {
1025 case 0:
1026 break;
1027 case -1:
1028 die_errno("fork failed");
1029 default:
1030 exit(0);
1031 }
1032 if (setsid() == -1)
1033 die_errno("setsid failed");
1034 close(0);
1035 close(1);
1036 close(2);
1037 sanitize_stdfds();
1038 return 0;
1039#endif
1040}